/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "code_generator_x86_64.h"
#include "art_method.h"
#include "class_table.h"
#include "code_generator_utils.h"
#include "compiled_method.h"
#include "entrypoints/quick/quick_entrypoints.h"
#include "gc/accounting/card_table.h"
#include "heap_poisoning.h"
#include "intrinsics.h"
#include "intrinsics_x86_64.h"
#include "linker/linker_patch.h"
#include "lock_word.h"
#include "mirror/array-inl.h"
#include "mirror/class-inl.h"
#include "mirror/object_reference.h"
#include "thread.h"
#include "utils/assembler.h"
#include "utils/stack_checks.h"
#include "utils/x86_64/assembler_x86_64.h"
#include "utils/x86_64/managed_register_x86_64.h"
namespace art {
template<class MirrorType>
class GcRoot;
namespace x86_64 {
static constexpr int kCurrentMethodStackOffset = 0;
static constexpr Register kMethodRegisterArgument = RDI;
// The compare/jump sequence will generate about (1.5 * num_entries) instructions. A jump
// table version generates 7 instructions and num_entries literals. Compare/jump sequence will
// generates less code/data with a small num_entries.
static constexpr uint32_t kPackedSwitchJumpTableThreshold = 5;
static constexpr Register kCoreCalleeSaves[] = { RBX, RBP, R12, R13, R14, R15 };
static constexpr FloatRegister kFpuCalleeSaves[] = { XMM12, XMM13, XMM14, XMM15 };
static constexpr int kC2ConditionMask = 0x400;
// NOLINT on __ macro to suppress wrong warning/fix (misc-macro-parentheses) from clang-tidy.
#define __ down_cast<X86_64Assembler*>(codegen->GetAssembler())-> // NOLINT
#define QUICK_ENTRY_POINT(x) QUICK_ENTRYPOINT_OFFSET(kX86_64PointerSize, x).Int32Value()
class NullCheckSlowPathX86_64 : public SlowPathCode {
public:
explicit NullCheckSlowPathX86_64(HNullCheck* instruction) : SlowPathCode(instruction) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
if (instruction_->CanThrowIntoCatchBlock()) {
// Live registers will be restored in the catch block if caught.
SaveLiveRegisters(codegen, instruction_->GetLocations());
}
x86_64_codegen->InvokeRuntime(kQuickThrowNullPointer,
instruction_,
instruction_->GetDexPc(),
this);
CheckEntrypointTypes<kQuickThrowNullPointer, void, void>();
}
bool IsFatal() const OVERRIDE { return true; }
const char* GetDescription() const OVERRIDE { return "NullCheckSlowPathX86_64"; }
private:
DISALLOW_COPY_AND_ASSIGN(NullCheckSlowPathX86_64);
};
class DivZeroCheckSlowPathX86_64 : public SlowPathCode {
public:
explicit DivZeroCheckSlowPathX86_64(HDivZeroCheck* instruction) : SlowPathCode(instruction) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
x86_64_codegen->InvokeRuntime(kQuickThrowDivZero, instruction_, instruction_->GetDexPc(), this);
CheckEntrypointTypes<kQuickThrowDivZero, void, void>();
}
bool IsFatal() const OVERRIDE { return true; }
const char* GetDescription() const OVERRIDE { return "DivZeroCheckSlowPathX86_64"; }
private:
DISALLOW_COPY_AND_ASSIGN(DivZeroCheckSlowPathX86_64);
};
class DivRemMinusOneSlowPathX86_64 : public SlowPathCode {
public:
DivRemMinusOneSlowPathX86_64(HInstruction* at, Register reg, DataType::Type type, bool is_div)
: SlowPathCode(at), cpu_reg_(CpuRegister(reg)), type_(type), is_div_(is_div) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
__ Bind(GetEntryLabel());
if (type_ == DataType::Type::kInt32) {
if (is_div_) {
__ negl(cpu_reg_);
} else {
__ xorl(cpu_reg_, cpu_reg_);
}
} else {
DCHECK_EQ(DataType::Type::kInt64, type_);
if (is_div_) {
__ negq(cpu_reg_);
} else {
__ xorl(cpu_reg_, cpu_reg_);
}
}
__ jmp(GetExitLabel());
}
const char* GetDescription() const OVERRIDE { return "DivRemMinusOneSlowPathX86_64"; }
private:
const CpuRegister cpu_reg_;
const DataType::Type type_;
const bool is_div_;
DISALLOW_COPY_AND_ASSIGN(DivRemMinusOneSlowPathX86_64);
};
class SuspendCheckSlowPathX86_64 : public SlowPathCode {
public:
SuspendCheckSlowPathX86_64(HSuspendCheck* instruction, HBasicBlock* successor)
: SlowPathCode(instruction), successor_(successor) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, locations); // Only saves full width XMM for SIMD.
x86_64_codegen->InvokeRuntime(kQuickTestSuspend, instruction_, instruction_->GetDexPc(), this);
CheckEntrypointTypes<kQuickTestSuspend, void, void>();
RestoreLiveRegisters(codegen, locations); // Only restores full width XMM for SIMD.
if (successor_ == nullptr) {
__ jmp(GetReturnLabel());
} else {
__ jmp(x86_64_codegen->GetLabelOf(successor_));
}
}
Label* GetReturnLabel() {
DCHECK(successor_ == nullptr);
return &return_label_;
}
HBasicBlock* GetSuccessor() const {
return successor_;
}
const char* GetDescription() const OVERRIDE { return "SuspendCheckSlowPathX86_64"; }
private:
HBasicBlock* const successor_;
Label return_label_;
DISALLOW_COPY_AND_ASSIGN(SuspendCheckSlowPathX86_64);
};
class BoundsCheckSlowPathX86_64 : public SlowPathCode {
public:
explicit BoundsCheckSlowPathX86_64(HBoundsCheck* instruction)
: SlowPathCode(instruction) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
if (instruction_->CanThrowIntoCatchBlock()) {
// Live registers will be restored in the catch block if caught.
SaveLiveRegisters(codegen, instruction_->GetLocations());
}
// Are we using an array length from memory?
HInstruction* array_length = instruction_->InputAt(1);
Location length_loc = locations->InAt(1);
InvokeRuntimeCallingConvention calling_convention;
if (array_length->IsArrayLength() && array_length->IsEmittedAtUseSite()) {
// Load the array length into our temporary.
HArrayLength* length = array_length->AsArrayLength();
uint32_t len_offset = CodeGenerator::GetArrayLengthOffset(length);
Location array_loc = array_length->GetLocations()->InAt(0);
Address array_len(array_loc.AsRegister<CpuRegister>(), len_offset);
length_loc = Location::RegisterLocation(calling_convention.GetRegisterAt(1));
// Check for conflicts with index.
if (length_loc.Equals(locations->InAt(0))) {
// We know we aren't using parameter 2.
length_loc = Location::RegisterLocation(calling_convention.GetRegisterAt(2));
}
__ movl(length_loc.AsRegister<CpuRegister>(), array_len);
if (mirror::kUseStringCompression && length->IsStringLength()) {
__ shrl(length_loc.AsRegister<CpuRegister>(), Immediate(1));
}
}
// We're moving two locations to locations that could overlap, so we need a parallel
// move resolver.
codegen->EmitParallelMoves(
locations->InAt(0),
Location::RegisterLocation(calling_convention.GetRegisterAt(0)),
DataType::Type::kInt32,
length_loc,
Location::RegisterLocation(calling_convention.GetRegisterAt(1)),
DataType::Type::kInt32);
QuickEntrypointEnum entrypoint = instruction_->AsBoundsCheck()->IsStringCharAt()
? kQuickThrowStringBounds
: kQuickThrowArrayBounds;
x86_64_codegen->InvokeRuntime(entrypoint, instruction_, instruction_->GetDexPc(), this);
CheckEntrypointTypes<kQuickThrowStringBounds, void, int32_t, int32_t>();
CheckEntrypointTypes<kQuickThrowArrayBounds, void, int32_t, int32_t>();
}
bool IsFatal() const OVERRIDE { return true; }
const char* GetDescription() const OVERRIDE { return "BoundsCheckSlowPathX86_64"; }
private:
DISALLOW_COPY_AND_ASSIGN(BoundsCheckSlowPathX86_64);
};
class LoadClassSlowPathX86_64 : public SlowPathCode {
public:
LoadClassSlowPathX86_64(HLoadClass* cls,
HInstruction* at,
uint32_t dex_pc,
bool do_clinit)
: SlowPathCode(at), cls_(cls), dex_pc_(dex_pc), do_clinit_(do_clinit) {
DCHECK(at->IsLoadClass() || at->IsClinitCheck());
}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, locations);
// Custom calling convention: RAX serves as both input and output.
__ movl(CpuRegister(RAX), Immediate(cls_->GetTypeIndex().index_));
x86_64_codegen->InvokeRuntime(do_clinit_ ? kQuickInitializeStaticStorage : kQuickInitializeType,
instruction_,
dex_pc_,
this);
if (do_clinit_) {
CheckEntrypointTypes<kQuickInitializeStaticStorage, void*, uint32_t>();
} else {
CheckEntrypointTypes<kQuickInitializeType, void*, uint32_t>();
}
Location out = locations->Out();
// Move the class to the desired location.
if (out.IsValid()) {
DCHECK(out.IsRegister() && !locations->GetLiveRegisters()->ContainsCoreRegister(out.reg()));
x86_64_codegen->Move(out, Location::RegisterLocation(RAX));
}
RestoreLiveRegisters(codegen, locations);
__ jmp(GetExitLabel());
}
const char* GetDescription() const OVERRIDE { return "LoadClassSlowPathX86_64"; }
private:
// The class this slow path will load.
HLoadClass* const cls_;
// The dex PC of `at_`.
const uint32_t dex_pc_;
// Whether to initialize the class.
const bool do_clinit_;
DISALLOW_COPY_AND_ASSIGN(LoadClassSlowPathX86_64);
};
class LoadStringSlowPathX86_64 : public SlowPathCode {
public:
explicit LoadStringSlowPathX86_64(HLoadString* instruction) : SlowPathCode(instruction) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
DCHECK(!locations->GetLiveRegisters()->ContainsCoreRegister(locations->Out().reg()));
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, locations);
const dex::StringIndex string_index = instruction_->AsLoadString()->GetStringIndex();
// Custom calling convention: RAX serves as both input and output.
__ movl(CpuRegister(RAX), Immediate(string_index.index_));
x86_64_codegen->InvokeRuntime(kQuickResolveString,
instruction_,
instruction_->GetDexPc(),
this);
CheckEntrypointTypes<kQuickResolveString, void*, uint32_t>();
x86_64_codegen->Move(locations->Out(), Location::RegisterLocation(RAX));
RestoreLiveRegisters(codegen, locations);
__ jmp(GetExitLabel());
}
const char* GetDescription() const OVERRIDE { return "LoadStringSlowPathX86_64"; }
private:
DISALLOW_COPY_AND_ASSIGN(LoadStringSlowPathX86_64);
};
class TypeCheckSlowPathX86_64 : public SlowPathCode {
public:
TypeCheckSlowPathX86_64(HInstruction* instruction, bool is_fatal)
: SlowPathCode(instruction), is_fatal_(is_fatal) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
uint32_t dex_pc = instruction_->GetDexPc();
DCHECK(instruction_->IsCheckCast()
|| !locations->GetLiveRegisters()->ContainsCoreRegister(locations->Out().reg()));
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
if (kPoisonHeapReferences &&
instruction_->IsCheckCast() &&
instruction_->AsCheckCast()->GetTypeCheckKind() == TypeCheckKind::kInterfaceCheck) {
// First, unpoison the `cls` reference that was poisoned for direct memory comparison.
__ UnpoisonHeapReference(locations->InAt(1).AsRegister<CpuRegister>());
}
if (!is_fatal_ || instruction_->CanThrowIntoCatchBlock()) {
SaveLiveRegisters(codegen, locations);
}
// We're moving two locations to locations that could overlap, so we need a parallel
// move resolver.
InvokeRuntimeCallingConvention calling_convention;
codegen->EmitParallelMoves(locations->InAt(0),
Location::RegisterLocation(calling_convention.GetRegisterAt(0)),
DataType::Type::kReference,
locations->InAt(1),
Location::RegisterLocation(calling_convention.GetRegisterAt(1)),
DataType::Type::kReference);
if (instruction_->IsInstanceOf()) {
x86_64_codegen->InvokeRuntime(kQuickInstanceofNonTrivial, instruction_, dex_pc, this);
CheckEntrypointTypes<kQuickInstanceofNonTrivial, size_t, mirror::Object*, mirror::Class*>();
} else {
DCHECK(instruction_->IsCheckCast());
x86_64_codegen->InvokeRuntime(kQuickCheckInstanceOf, instruction_, dex_pc, this);
CheckEntrypointTypes<kQuickCheckInstanceOf, void, mirror::Object*, mirror::Class*>();
}
if (!is_fatal_) {
if (instruction_->IsInstanceOf()) {
x86_64_codegen->Move(locations->Out(), Location::RegisterLocation(RAX));
}
RestoreLiveRegisters(codegen, locations);
__ jmp(GetExitLabel());
}
}
const char* GetDescription() const OVERRIDE { return "TypeCheckSlowPathX86_64"; }
bool IsFatal() const OVERRIDE { return is_fatal_; }
private:
const bool is_fatal_;
DISALLOW_COPY_AND_ASSIGN(TypeCheckSlowPathX86_64);
};
class DeoptimizationSlowPathX86_64 : public SlowPathCode {
public:
explicit DeoptimizationSlowPathX86_64(HDeoptimize* instruction)
: SlowPathCode(instruction) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
__ Bind(GetEntryLabel());
LocationSummary* locations = instruction_->GetLocations();
SaveLiveRegisters(codegen, locations);
InvokeRuntimeCallingConvention calling_convention;
x86_64_codegen->Load32BitValue(
CpuRegister(calling_convention.GetRegisterAt(0)),
static_cast<uint32_t>(instruction_->AsDeoptimize()->GetDeoptimizationKind()));
x86_64_codegen->InvokeRuntime(kQuickDeoptimize, instruction_, instruction_->GetDexPc(), this);
CheckEntrypointTypes<kQuickDeoptimize, void, DeoptimizationKind>();
}
const char* GetDescription() const OVERRIDE { return "DeoptimizationSlowPathX86_64"; }
private:
DISALLOW_COPY_AND_ASSIGN(DeoptimizationSlowPathX86_64);
};
class ArraySetSlowPathX86_64 : public SlowPathCode {
public:
explicit ArraySetSlowPathX86_64(HInstruction* instruction) : SlowPathCode(instruction) {}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, locations);
InvokeRuntimeCallingConvention calling_convention;
HParallelMove parallel_move(codegen->GetGraph()->GetAllocator());
parallel_move.AddMove(
locations->InAt(0),
Location::RegisterLocation(calling_convention.GetRegisterAt(0)),
DataType::Type::kReference,
nullptr);
parallel_move.AddMove(
locations->InAt(1),
Location::RegisterLocation(calling_convention.GetRegisterAt(1)),
DataType::Type::kInt32,
nullptr);
parallel_move.AddMove(
locations->InAt(2),
Location::RegisterLocation(calling_convention.GetRegisterAt(2)),
DataType::Type::kReference,
nullptr);
codegen->GetMoveResolver()->EmitNativeCode(¶llel_move);
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
x86_64_codegen->InvokeRuntime(kQuickAputObject, instruction_, instruction_->GetDexPc(), this);
CheckEntrypointTypes<kQuickAputObject, void, mirror::Array*, int32_t, mirror::Object*>();
RestoreLiveRegisters(codegen, locations);
__ jmp(GetExitLabel());
}
const char* GetDescription() const OVERRIDE { return "ArraySetSlowPathX86_64"; }
private:
DISALLOW_COPY_AND_ASSIGN(ArraySetSlowPathX86_64);
};
// Slow path marking an object reference `ref` during a read
// barrier. The field `obj.field` in the object `obj` holding this
// reference does not get updated by this slow path after marking (see
// ReadBarrierMarkAndUpdateFieldSlowPathX86_64 below for that).
//
// This means that after the execution of this slow path, `ref` will
// always be up-to-date, but `obj.field` may not; i.e., after the
// flip, `ref` will be a to-space reference, but `obj.field` will
// probably still be a from-space reference (unless it gets updated by
// another thread, or if another thread installed another object
// reference (different from `ref`) in `obj.field`).
class ReadBarrierMarkSlowPathX86_64 : public SlowPathCode {
public:
ReadBarrierMarkSlowPathX86_64(HInstruction* instruction,
Location ref,
bool unpoison_ref_before_marking)
: SlowPathCode(instruction),
ref_(ref),
unpoison_ref_before_marking_(unpoison_ref_before_marking) {
DCHECK(kEmitCompilerReadBarrier);
}
const char* GetDescription() const OVERRIDE { return "ReadBarrierMarkSlowPathX86_64"; }
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
CpuRegister ref_cpu_reg = ref_.AsRegister<CpuRegister>();
Register ref_reg = ref_cpu_reg.AsRegister();
DCHECK(locations->CanCall());
DCHECK(!locations->GetLiveRegisters()->ContainsCoreRegister(ref_reg)) << ref_reg;
DCHECK(instruction_->IsInstanceFieldGet() ||
instruction_->IsStaticFieldGet() ||
instruction_->IsArrayGet() ||
instruction_->IsArraySet() ||
instruction_->IsLoadClass() ||
instruction_->IsLoadString() ||
instruction_->IsInstanceOf() ||
instruction_->IsCheckCast() ||
(instruction_->IsInvokeVirtual() && instruction_->GetLocations()->Intrinsified()) ||
(instruction_->IsInvokeStaticOrDirect() && instruction_->GetLocations()->Intrinsified()))
<< "Unexpected instruction in read barrier marking slow path: "
<< instruction_->DebugName();
__ Bind(GetEntryLabel());
if (unpoison_ref_before_marking_) {
// Object* ref = ref_addr->AsMirrorPtr()
__ MaybeUnpoisonHeapReference(ref_cpu_reg);
}
// No need to save live registers; it's taken care of by the
// entrypoint. Also, there is no need to update the stack mask,
// as this runtime call will not trigger a garbage collection.
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
DCHECK_NE(ref_reg, RSP);
DCHECK(0 <= ref_reg && ref_reg < kNumberOfCpuRegisters) << ref_reg;
// "Compact" slow path, saving two moves.
//
// Instead of using the standard runtime calling convention (input
// and output in R0):
//
// RDI <- ref
// RAX <- ReadBarrierMark(RDI)
// ref <- RAX
//
// we just use rX (the register containing `ref`) as input and output
// of a dedicated entrypoint:
//
// rX <- ReadBarrierMarkRegX(rX)
//
int32_t entry_point_offset =
Thread::ReadBarrierMarkEntryPointsOffset<kX86_64PointerSize>(ref_reg);
// This runtime call does not require a stack map.
x86_64_codegen->InvokeRuntimeWithoutRecordingPcInfo(entry_point_offset, instruction_, this);
__ jmp(GetExitLabel());
}
private:
// The location (register) of the marked object reference.
const Location ref_;
// Should the reference in `ref_` be unpoisoned prior to marking it?
const bool unpoison_ref_before_marking_;
DISALLOW_COPY_AND_ASSIGN(ReadBarrierMarkSlowPathX86_64);
};
// Slow path marking an object reference `ref` during a read barrier,
// and if needed, atomically updating the field `obj.field` in the
// object `obj` holding this reference after marking (contrary to
// ReadBarrierMarkSlowPathX86_64 above, which never tries to update
// `obj.field`).
//
// This means that after the execution of this slow path, both `ref`
// and `obj.field` will be up-to-date; i.e., after the flip, both will
// hold the same to-space reference (unless another thread installed
// another object reference (different from `ref`) in `obj.field`).
class ReadBarrierMarkAndUpdateFieldSlowPathX86_64 : public SlowPathCode {
public:
ReadBarrierMarkAndUpdateFieldSlowPathX86_64(HInstruction* instruction,
Location ref,
CpuRegister obj,
const Address& field_addr,
bool unpoison_ref_before_marking,
CpuRegister temp1,
CpuRegister temp2)
: SlowPathCode(instruction),
ref_(ref),
obj_(obj),
field_addr_(field_addr),
unpoison_ref_before_marking_(unpoison_ref_before_marking),
temp1_(temp1),
temp2_(temp2) {
DCHECK(kEmitCompilerReadBarrier);
}
const char* GetDescription() const OVERRIDE {
return "ReadBarrierMarkAndUpdateFieldSlowPathX86_64";
}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
CpuRegister ref_cpu_reg = ref_.AsRegister<CpuRegister>();
Register ref_reg = ref_cpu_reg.AsRegister();
DCHECK(locations->CanCall());
DCHECK(!locations->GetLiveRegisters()->ContainsCoreRegister(ref_reg)) << ref_reg;
// This slow path is only used by the UnsafeCASObject intrinsic.
DCHECK((instruction_->IsInvokeVirtual() && instruction_->GetLocations()->Intrinsified()))
<< "Unexpected instruction in read barrier marking and field updating slow path: "
<< instruction_->DebugName();
DCHECK(instruction_->GetLocations()->Intrinsified());
DCHECK_EQ(instruction_->AsInvoke()->GetIntrinsic(), Intrinsics::kUnsafeCASObject);
__ Bind(GetEntryLabel());
if (unpoison_ref_before_marking_) {
// Object* ref = ref_addr->AsMirrorPtr()
__ MaybeUnpoisonHeapReference(ref_cpu_reg);
}
// Save the old (unpoisoned) reference.
__ movl(temp1_, ref_cpu_reg);
// No need to save live registers; it's taken care of by the
// entrypoint. Also, there is no need to update the stack mask,
// as this runtime call will not trigger a garbage collection.
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
DCHECK_NE(ref_reg, RSP);
DCHECK(0 <= ref_reg && ref_reg < kNumberOfCpuRegisters) << ref_reg;
// "Compact" slow path, saving two moves.
//
// Instead of using the standard runtime calling convention (input
// and output in R0):
//
// RDI <- ref
// RAX <- ReadBarrierMark(RDI)
// ref <- RAX
//
// we just use rX (the register containing `ref`) as input and output
// of a dedicated entrypoint:
//
// rX <- ReadBarrierMarkRegX(rX)
//
int32_t entry_point_offset =
Thread::ReadBarrierMarkEntryPointsOffset<kX86_64PointerSize>(ref_reg);
// This runtime call does not require a stack map.
x86_64_codegen->InvokeRuntimeWithoutRecordingPcInfo(entry_point_offset, instruction_, this);
// If the new reference is different from the old reference,
// update the field in the holder (`*field_addr`).
//
// Note that this field could also hold a different object, if
// another thread had concurrently changed it. In that case, the
// LOCK CMPXCHGL instruction in the compare-and-set (CAS)
// operation below would abort the CAS, leaving the field as-is.
NearLabel done;
__ cmpl(temp1_, ref_cpu_reg);
__ j(kEqual, &done);
// Update the the holder's field atomically. This may fail if
// mutator updates before us, but it's OK. This is achived
// using a strong compare-and-set (CAS) operation with relaxed
// memory synchronization ordering, where the expected value is
// the old reference and the desired value is the new reference.
// This operation is implemented with a 32-bit LOCK CMPXLCHG
// instruction, which requires the expected value (the old
// reference) to be in EAX. Save RAX beforehand, and move the
// expected value (stored in `temp1_`) into EAX.
__ movq(temp2_, CpuRegister(RAX));
__ movl(CpuRegister(RAX), temp1_);
// Convenience aliases.
CpuRegister base = obj_;
CpuRegister expected = CpuRegister(RAX);
CpuRegister value = ref_cpu_reg;
bool base_equals_value = (base.AsRegister() == value.AsRegister());
Register value_reg = ref_reg;
if (kPoisonHeapReferences) {
if (base_equals_value) {
// If `base` and `value` are the same register location, move
// `value_reg` to a temporary register. This way, poisoning
// `value_reg` won't invalidate `base`.
value_reg = temp1_.AsRegister();
__ movl(CpuRegister(value_reg), base);
}
// Check that the register allocator did not assign the location
// of `expected` (RAX) to `value` nor to `base`, so that heap
// poisoning (when enabled) works as intended below.
// - If `value` were equal to `expected`, both references would
// be poisoned twice, meaning they would not be poisoned at
// all, as heap poisoning uses address negation.
// - If `base` were equal to `expected`, poisoning `expected`
// would invalidate `base`.
DCHECK_NE(value_reg, expected.AsRegister());
DCHECK_NE(base.AsRegister(), expected.AsRegister());
__ PoisonHeapReference(expected);
__ PoisonHeapReference(CpuRegister(value_reg));
}
__ LockCmpxchgl(field_addr_, CpuRegister(value_reg));
// If heap poisoning is enabled, we need to unpoison the values
// that were poisoned earlier.
if (kPoisonHeapReferences) {
if (base_equals_value) {
// `value_reg` has been moved to a temporary register, no need
// to unpoison it.
} else {
__ UnpoisonHeapReference(CpuRegister(value_reg));
}
// No need to unpoison `expected` (RAX), as it is be overwritten below.
}
// Restore RAX.
__ movq(CpuRegister(RAX), temp2_);
__ Bind(&done);
__ jmp(GetExitLabel());
}
private:
// The location (register) of the marked object reference.
const Location ref_;
// The register containing the object holding the marked object reference field.
const CpuRegister obj_;
// The address of the marked reference field. The base of this address must be `obj_`.
const Address field_addr_;
// Should the reference in `ref_` be unpoisoned prior to marking it?
const bool unpoison_ref_before_marking_;
const CpuRegister temp1_;
const CpuRegister temp2_;
DISALLOW_COPY_AND_ASSIGN(ReadBarrierMarkAndUpdateFieldSlowPathX86_64);
};
// Slow path generating a read barrier for a heap reference.
class ReadBarrierForHeapReferenceSlowPathX86_64 : public SlowPathCode {
public:
ReadBarrierForHeapReferenceSlowPathX86_64(HInstruction* instruction,
Location out,
Location ref,
Location obj,
uint32_t offset,
Location index)
: SlowPathCode(instruction),
out_(out),
ref_(ref),
obj_(obj),
offset_(offset),
index_(index) {
DCHECK(kEmitCompilerReadBarrier);
// If `obj` is equal to `out` or `ref`, it means the initial
// object has been overwritten by (or after) the heap object
// reference load to be instrumented, e.g.:
//
// __ movl(out, Address(out, offset));
// codegen_->GenerateReadBarrierSlow(instruction, out_loc, out_loc, out_loc, offset);
//
// In that case, we have lost the information about the original
// object, and the emitted read barrier cannot work properly.
DCHECK(!obj.Equals(out)) << "obj=" << obj << " out=" << out;
DCHECK(!obj.Equals(ref)) << "obj=" << obj << " ref=" << ref;
}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
LocationSummary* locations = instruction_->GetLocations();
CpuRegister reg_out = out_.AsRegister<CpuRegister>();
DCHECK(locations->CanCall());
DCHECK(!locations->GetLiveRegisters()->ContainsCoreRegister(reg_out.AsRegister())) << out_;
DCHECK(instruction_->IsInstanceFieldGet() ||
instruction_->IsStaticFieldGet() ||
instruction_->IsArrayGet() ||
instruction_->IsInstanceOf() ||
instruction_->IsCheckCast() ||
(instruction_->IsInvokeVirtual() && instruction_->GetLocations()->Intrinsified()))
<< "Unexpected instruction in read barrier for heap reference slow path: "
<< instruction_->DebugName();
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, locations);
// We may have to change the index's value, but as `index_` is a
// constant member (like other "inputs" of this slow path),
// introduce a copy of it, `index`.
Location index = index_;
if (index_.IsValid()) {
// Handle `index_` for HArrayGet and UnsafeGetObject/UnsafeGetObjectVolatile intrinsics.
if (instruction_->IsArrayGet()) {
// Compute real offset and store it in index_.
Register index_reg = index_.AsRegister<CpuRegister>().AsRegister();
DCHECK(locations->GetLiveRegisters()->ContainsCoreRegister(index_reg));
if (codegen->IsCoreCalleeSaveRegister(index_reg)) {
// We are about to change the value of `index_reg` (see the
// calls to art::x86_64::X86_64Assembler::shll and
// art::x86_64::X86_64Assembler::AddImmediate below), but it
// has not been saved by the previous call to
// art::SlowPathCode::SaveLiveRegisters, as it is a
// callee-save register --
// art::SlowPathCode::SaveLiveRegisters does not consider
// callee-save registers, as it has been designed with the
// assumption that callee-save registers are supposed to be
// handled by the called function. So, as a callee-save
// register, `index_reg` _would_ eventually be saved onto
// the stack, but it would be too late: we would have
// changed its value earlier. Therefore, we manually save
// it here into another freely available register,
// `free_reg`, chosen of course among the caller-save
// registers (as a callee-save `free_reg` register would
// exhibit the same problem).
//
// Note we could have requested a temporary register from
// the register allocator instead; but we prefer not to, as
// this is a slow path, and we know we can find a
// caller-save register that is available.
Register free_reg = FindAvailableCallerSaveRegister(codegen).AsRegister();
__ movl(CpuRegister(free_reg), CpuRegister(index_reg));
index_reg = free_reg;
index = Location::RegisterLocation(index_reg);
} else {
// The initial register stored in `index_` has already been
// saved in the call to art::SlowPathCode::SaveLiveRegisters
// (as it is not a callee-save register), so we can freely
// use it.
}
// Shifting the index value contained in `index_reg` by the
// scale factor (2) cannot overflow in practice, as the
// runtime is unable to allocate object arrays with a size
// larger than 2^26 - 1 (that is, 2^28 - 4 bytes).
__ shll(CpuRegister(index_reg), Immediate(TIMES_4));
static_assert(
sizeof(mirror::HeapReference<mirror::Object>) == sizeof(int32_t),
"art::mirror::HeapReference<art::mirror::Object> and int32_t have different sizes.");
__ AddImmediate(CpuRegister(index_reg), Immediate(offset_));
} else {
// In the case of the UnsafeGetObject/UnsafeGetObjectVolatile
// intrinsics, `index_` is not shifted by a scale factor of 2
// (as in the case of ArrayGet), as it is actually an offset
// to an object field within an object.
DCHECK(instruction_->IsInvoke()) << instruction_->DebugName();
DCHECK(instruction_->GetLocations()->Intrinsified());
DCHECK((instruction_->AsInvoke()->GetIntrinsic() == Intrinsics::kUnsafeGetObject) ||
(instruction_->AsInvoke()->GetIntrinsic() == Intrinsics::kUnsafeGetObjectVolatile))
<< instruction_->AsInvoke()->GetIntrinsic();
DCHECK_EQ(offset_, 0U);
DCHECK(index_.IsRegister());
}
}
// We're moving two or three locations to locations that could
// overlap, so we need a parallel move resolver.
InvokeRuntimeCallingConvention calling_convention;
HParallelMove parallel_move(codegen->GetGraph()->GetAllocator());
parallel_move.AddMove(ref_,
Location::RegisterLocation(calling_convention.GetRegisterAt(0)),
DataType::Type::kReference,
nullptr);
parallel_move.AddMove(obj_,
Location::RegisterLocation(calling_convention.GetRegisterAt(1)),
DataType::Type::kReference,
nullptr);
if (index.IsValid()) {
parallel_move.AddMove(index,
Location::RegisterLocation(calling_convention.GetRegisterAt(2)),
DataType::Type::kInt32,
nullptr);
codegen->GetMoveResolver()->EmitNativeCode(¶llel_move);
} else {
codegen->GetMoveResolver()->EmitNativeCode(¶llel_move);
__ movl(CpuRegister(calling_convention.GetRegisterAt(2)), Immediate(offset_));
}
x86_64_codegen->InvokeRuntime(kQuickReadBarrierSlow,
instruction_,
instruction_->GetDexPc(),
this);
CheckEntrypointTypes<
kQuickReadBarrierSlow, mirror::Object*, mirror::Object*, mirror::Object*, uint32_t>();
x86_64_codegen->Move(out_, Location::RegisterLocation(RAX));
RestoreLiveRegisters(codegen, locations);
__ jmp(GetExitLabel());
}
const char* GetDescription() const OVERRIDE {
return "ReadBarrierForHeapReferenceSlowPathX86_64";
}
private:
CpuRegister FindAvailableCallerSaveRegister(CodeGenerator* codegen) {
size_t ref = static_cast<int>(ref_.AsRegister<CpuRegister>().AsRegister());
size_t obj = static_cast<int>(obj_.AsRegister<CpuRegister>().AsRegister());
for (size_t i = 0, e = codegen->GetNumberOfCoreRegisters(); i < e; ++i) {
if (i != ref && i != obj && !codegen->IsCoreCalleeSaveRegister(i)) {
return static_cast<CpuRegister>(i);
}
}
// We shall never fail to find a free caller-save register, as
// there are more than two core caller-save registers on x86-64
// (meaning it is possible to find one which is different from
// `ref` and `obj`).
DCHECK_GT(codegen->GetNumberOfCoreCallerSaveRegisters(), 2u);
LOG(FATAL) << "Could not find a free caller-save register";
UNREACHABLE();
}
const Location out_;
const Location ref_;
const Location obj_;
const uint32_t offset_;
// An additional location containing an index to an array.
// Only used for HArrayGet and the UnsafeGetObject &
// UnsafeGetObjectVolatile intrinsics.
const Location index_;
DISALLOW_COPY_AND_ASSIGN(ReadBarrierForHeapReferenceSlowPathX86_64);
};
// Slow path generating a read barrier for a GC root.
class ReadBarrierForRootSlowPathX86_64 : public SlowPathCode {
public:
ReadBarrierForRootSlowPathX86_64(HInstruction* instruction, Location out, Location root)
: SlowPathCode(instruction), out_(out), root_(root) {
DCHECK(kEmitCompilerReadBarrier);
}
void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
LocationSummary* locations = instruction_->GetLocations();
DCHECK(locations->CanCall());
DCHECK(!locations->GetLiveRegisters()->ContainsCoreRegister(out_.reg()));
DCHECK(instruction_->IsLoadClass() || instruction_->IsLoadString())
<< "Unexpected instruction in read barrier for GC root slow path: "
<< instruction_->DebugName();
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, locations);
InvokeRuntimeCallingConvention calling_convention;
CodeGeneratorX86_64* x86_64_codegen = down_cast<CodeGeneratorX86_64*>(codegen);
x86_64_codegen->Move(Location::RegisterLocation(calling_convention.GetRegisterAt(0)), root_);
x86_64_codegen->InvokeRuntime(kQuickReadBarrierForRootSlow,
instruction_,
instruction_->GetDexPc(),
this);
CheckEntrypointTypes<kQuickReadBarrierForRootSlow, mirror::Object*, GcRoot<mirror::Object>*>();
x86_64_codegen->Move(out_, Location::RegisterLocation(RAX));
RestoreLiveRegisters(codegen, locations);
__ jmp(GetExitLabel());
}
const char* GetDescription() const OVERRIDE { return "ReadBarrierForRootSlowPathX86_64"; }
private:
const Location out_;
const Location root_;
DISALLOW_COPY_AND_ASSIGN(ReadBarrierForRootSlowPathX86_64);
};
#undef __
// NOLINT on __ macro to suppress wrong warning/fix (misc-macro-parentheses) from clang-tidy.
#define __ down_cast<X86_64Assembler*>(GetAssembler())-> // NOLINT
inline Condition X86_64IntegerCondition(IfCondition cond) {
switch (cond) {
case kCondEQ: return kEqual;
case kCondNE: return kNotEqual;
case kCondLT: return kLess;
case kCondLE: return kLessEqual;
case kCondGT: return kGreater;
case kCondGE: return kGreaterEqual;
case kCondB: return kBelow;
case kCondBE: return kBelowEqual;
case kCondA: return kAbove;
case kCondAE: return kAboveEqual;
}
LOG(FATAL) << "Unreachable";
UNREACHABLE();
}
// Maps FP condition to x86_64 name.
inline Condition X86_64FPCondition(IfCondition cond) {
switch (cond) {
case kCondEQ: return kEqual;
case kCondNE: return kNotEqual;
case kCondLT: return kBelow;
case kCondLE: return kBelowEqual;
case kCondGT: return kAbove;
case kCondGE: return kAboveEqual;
default: break; // should not happen
}
LOG(FATAL) << "Unreachable";
UNREACHABLE();
}
HInvokeStaticOrDirect::DispatchInfo CodeGeneratorX86_64::GetSupportedInvokeStaticOrDirectDispatch(
const HInvokeStaticOrDirect::DispatchInfo& desired_dispatch_info,
HInvokeStaticOrDirect* invoke ATTRIBUTE_UNUSED) {
return desired_dispatch_info;
}
void CodeGeneratorX86_64::GenerateStaticOrDirectCall(
HInvokeStaticOrDirect* invoke, Location temp, SlowPathCode* slow_path) {
// All registers are assumed to be correctly set up.
Location callee_method = temp; // For all kinds except kRecursive, callee will be in temp.
switch (invoke->GetMethodLoadKind()) {
case HInvokeStaticOrDirect::MethodLoadKind::kStringInit: {
// temp = thread->string_init_entrypoint
uint32_t offset =
GetThreadOffset<kX86_64PointerSize>(invoke->GetStringInitEntryPoint()).Int32Value();
__ gs()->movq(temp.AsRegister<CpuRegister>(), Address::Absolute(offset, /* no_rip */ true));
break;
}
case HInvokeStaticOrDirect::MethodLoadKind::kRecursive:
callee_method = invoke->GetLocations()->InAt(invoke->GetSpecialInputIndex());
break;
case HInvokeStaticOrDirect::MethodLoadKind::kBootImageLinkTimePcRelative:
DCHECK(GetCompilerOptions().IsBootImage());
__ leal(temp.AsRegister<CpuRegister>(),
Address::Absolute(kDummy32BitOffset, /* no_rip */ false));
RecordBootImageMethodPatch(invoke);
break;
case HInvokeStaticOrDirect::MethodLoadKind::kDirectAddress:
Load64BitValue(temp.AsRegister<CpuRegister>(), invoke->GetMethodAddress());
break;
case HInvokeStaticOrDirect::MethodLoadKind::kBssEntry: {
__ movq(temp.AsRegister<CpuRegister>(),
Address::Absolute(kDummy32BitOffset, /* no_rip */ false));
RecordMethodBssEntryPatch(invoke);
break;
}
case HInvokeStaticOrDirect::MethodLoadKind::kRuntimeCall: {
GenerateInvokeStaticOrDirectRuntimeCall(invoke, temp, slow_path);
return; // No code pointer retrieval; the runtime performs the call directly.
}
}
switch (invoke->GetCodePtrLocation()) {
case HInvokeStaticOrDirect::CodePtrLocation::kCallSelf:
__ call(&frame_entry_label_);
break;
case HInvokeStaticOrDirect::CodePtrLocation::kCallArtMethod:
// (callee_method + offset_of_quick_compiled_code)()
__ call(Address(callee_method.AsRegister<CpuRegister>(),
ArtMethod::EntryPointFromQuickCompiledCodeOffset(
kX86_64PointerSize).SizeValue()));
break;
}
RecordPcInfo(invoke, invoke->GetDexPc(), slow_path);
DCHECK(!IsLeafMethod());
}
void CodeGeneratorX86_64::GenerateVirtualCall(
HInvokeVirtual* invoke, Location temp_in, SlowPathCode* slow_path) {
CpuRegister temp = temp_in.AsRegister<CpuRegister>();
size_t method_offset = mirror::Class::EmbeddedVTableEntryOffset(
invoke->GetVTableIndex(), kX86_64PointerSize).SizeValue();
// Use the calling convention instead of the location of the receiver, as
// intrinsics may have put the receiver in a different register. In the intrinsics
// slow path, the arguments have been moved to the right place, so here we are
// guaranteed that the receiver is the first register of the calling convention.
InvokeDexCallingConvention calling_convention;
Register receiver = calling_convention.GetRegisterAt(0);
size_t class_offset = mirror::Object::ClassOffset().SizeValue();
// /* HeapReference<Class> */ temp = receiver->klass_
__ movl(temp, Address(CpuRegister(receiver), class_offset));
MaybeRecordImplicitNullCheck(invoke);
// Instead of simply (possibly) unpoisoning `temp` here, we should
// emit a read barrier for the previous class reference load.
// However this is not required in practice, as this is an
// intermediate/temporary reference and because the current
// concurrent copying collector keeps the from-space memory
// intact/accessible until the end of the marking phase (the
// concurrent copying collector may not in the future).
__ MaybeUnpoisonHeapReference(temp);
// temp = temp->GetMethodAt(method_offset);
__ movq(temp, Address(temp, method_offset));
// call temp->GetEntryPoint();
__ call(Address(temp, ArtMethod::EntryPointFromQuickCompiledCodeOffset(
kX86_64PointerSize).SizeValue()));
RecordPcInfo(invoke, invoke->GetDexPc(), slow_path);
}
void CodeGeneratorX86_64::RecordBootImageMethodPatch(HInvokeStaticOrDirect* invoke) {
boot_image_method_patches_.emplace_back(
invoke->GetTargetMethod().dex_file, invoke->GetTargetMethod().index);
__ Bind(&boot_image_method_patches_.back().label);
}
void CodeGeneratorX86_64::RecordMethodBssEntryPatch(HInvokeStaticOrDirect* invoke) {
method_bss_entry_patches_.emplace_back(&GetGraph()->GetDexFile(), invoke->GetDexMethodIndex());
__ Bind(&method_bss_entry_patches_.back().label);
}
void CodeGeneratorX86_64::RecordBootImageTypePatch(HLoadClass* load_class) {
boot_image_type_patches_.emplace_back(
&load_class->GetDexFile(), load_class->GetTypeIndex().index_);
__ Bind(&boot_image_type_patches_.back().label);
}
Label* CodeGeneratorX86_64::NewTypeBssEntryPatch(HLoadClass* load_class) {
type_bss_entry_patches_.emplace_back(
&load_class->GetDexFile(), load_class->GetTypeIndex().index_);
return &type_bss_entry_patches_.back().label;
}
void CodeGeneratorX86_64::RecordBootImageStringPatch(HLoadString* load_string) {
boot_image_string_patches_.emplace_back(
&load_string->GetDexFile(), load_string->GetStringIndex().index_);
__ Bind(&boot_image_string_patches_.back().label);
}
Label* CodeGeneratorX86_64::NewStringBssEntryPatch(HLoadString* load_string) {
DCHECK(!GetCompilerOptions().IsBootImage());
string_bss_entry_patches_.emplace_back(
&load_string->GetDexFile(), load_string->GetStringIndex().index_);
return &string_bss_entry_patches_.back().label;
}
// The label points to the end of the "movl" or another instruction but the literal offset
// for method patch needs to point to the embedded constant which occupies the last 4 bytes.
constexpr uint32_t kLabelPositionToLiteralOffsetAdjustment = 4u;
template <linker::LinkerPatch (*Factory)(size_t, const DexFile*, uint32_t, uint32_t)>
inline void CodeGeneratorX86_64::EmitPcRelativeLinkerPatches(
const ArenaDeque<PatchInfo<Label>>& infos,
ArenaVector<linker::LinkerPatch>* linker_patches) {
for (const PatchInfo<Label>& info : infos) {
uint32_t literal_offset = info.label.Position() - kLabelPositionToLiteralOffsetAdjustment;
linker_patches->push_back(
Factory(literal_offset, info.target_dex_file, info.label.Position(), info.offset_or_index));
}
}
void CodeGeneratorX86_64::EmitLinkerPatches(ArenaVector<linker::LinkerPatch>* linker_patches) {
DCHECK(linker_patches->empty());
size_t size =
boot_image_method_patches_.size() +
method_bss_entry_patches_.size() +
boot_image_type_patches_.size() +
type_bss_entry_patches_.size() +
boot_image_string_patches_.size() +
string_bss_entry_patches_.size();
linker_patches->reserve(size);
if (GetCompilerOptions().IsBootImage()) {
EmitPcRelativeLinkerPatches<linker::LinkerPatch::RelativeMethodPatch>(
boot_image_method_patches_, linker_patches);
EmitPcRelativeLinkerPatches<linker::LinkerPatch::RelativeTypePatch>(
boot_image_type_patches_, linker_patches);
EmitPcRelativeLinkerPatches<linker::LinkerPatch::RelativeStringPatch>(
boot_image_string_patches_, linker_patches);
} else {
DCHECK(boot_image_method_patches_.empty());
EmitPcRelativeLinkerPatches<linker::LinkerPatch::TypeClassTablePatch>(
boot_image_type_patches_, linker_patches);
EmitPcRelativeLinkerPatches<linker::LinkerPatch::StringInternTablePatch>(
boot_image_string_patches_, linker_patches);
}
EmitPcRelativeLinkerPatches<linker::LinkerPatch::MethodBssEntryPatch>(
method_bss_entry_patches_, linker_patches);
EmitPcRelativeLinkerPatches<linker::LinkerPatch::TypeBssEntryPatch>(
type_bss_entry_patches_, linker_patches);
EmitPcRelativeLinkerPatches<linker::LinkerPatch::StringBssEntryPatch>(
string_bss_entry_patches_, linker_patches);
DCHECK_EQ(size, linker_patches->size());
}
void CodeGeneratorX86_64::DumpCoreRegister(std::ostream& stream, int reg) const {
stream << Register(reg);
}
void CodeGeneratorX86_64::DumpFloatingPointRegister(std::ostream& stream, int reg) const {
stream << FloatRegister(reg);
}
size_t CodeGeneratorX86_64::SaveCoreRegister(size_t stack_index, uint32_t reg_id) {
__ movq(Address(CpuRegister(RSP), stack_index), CpuRegister(reg_id));
return kX86_64WordSize;
}
size_t CodeGeneratorX86_64::RestoreCoreRegister(size_t stack_index, uint32_t reg_id) {
__ movq(CpuRegister(reg_id), Address(CpuRegister(RSP), stack_index));
return kX86_64WordSize;
}
size_t CodeGeneratorX86_64::SaveFloatingPointRegister(size_t stack_index, uint32_t reg_id) {
if (GetGraph()->HasSIMD()) {
__ movups(Address(CpuRegister(RSP), stack_index), XmmRegister(reg_id));
} else {
__ movsd(Address(CpuRegister(RSP), stack_index), XmmRegister(reg_id));
}
return GetFloatingPointSpillSlotSize();
}
size_t CodeGeneratorX86_64::RestoreFloatingPointRegister(size_t stack_index, uint32_t reg_id) {
if (GetGraph()->HasSIMD()) {
__ movups(XmmRegister(reg_id), Address(CpuRegister(RSP), stack_index));
} else {
__ movsd(XmmRegister(reg_id), Address(CpuRegister(RSP), stack_index));
}
return GetFloatingPointSpillSlotSize();
}
void CodeGeneratorX86_64::InvokeRuntime(QuickEntrypointEnum entrypoint,
HInstruction* instruction,
uint32_t dex_pc,
SlowPathCode* slow_path) {
ValidateInvokeRuntime(entrypoint, instruction, slow_path);
GenerateInvokeRuntime(GetThreadOffset<kX86_64PointerSize>(entrypoint).Int32Value());
if (EntrypointRequiresStackMap(entrypoint)) {
RecordPcInfo(instruction, dex_pc, slow_path);
}
}
void CodeGeneratorX86_64::InvokeRuntimeWithoutRecordingPcInfo(int32_t entry_point_offset,
HInstruction* instruction,
SlowPathCode* slow_path) {
ValidateInvokeRuntimeWithoutRecordingPcInfo(instruction, slow_path);
GenerateInvokeRuntime(entry_point_offset);
}
void CodeGeneratorX86_64::GenerateInvokeRuntime(int32_t entry_point_offset) {
__ gs()->call(Address::Absolute(entry_point_offset, /* no_rip */ true));
}
static constexpr int kNumberOfCpuRegisterPairs = 0;
// Use a fake return address register to mimic Quick.
static constexpr Register kFakeReturnRegister = Register(kLastCpuRegister + 1);
CodeGeneratorX86_64::CodeGeneratorX86_64(HGraph* graph,
const X86_64InstructionSetFeatures& isa_features,
const CompilerOptions& compiler_options,
OptimizingCompilerStats* stats)
: CodeGenerator(graph,
kNumberOfCpuRegisters,
kNumberOfFloatRegisters,
kNumberOfCpuRegisterPairs,
ComputeRegisterMask(reinterpret_cast<const int*>(kCoreCalleeSaves),
arraysize(kCoreCalleeSaves))
| (1 << kFakeReturnRegister),
ComputeRegisterMask(reinterpret_cast<const int*>(kFpuCalleeSaves),
arraysize(kFpuCalleeSaves)),
compiler_options,
stats),
block_labels_(nullptr),
location_builder_(graph, this),
instruction_visitor_(graph, this),
move_resolver_(graph->GetAllocator(), this),
assembler_(graph->GetAllocator()),
isa_features_(isa_features),
constant_area_start_(0),
boot_image_method_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
method_bss_entry_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
boot_image_type_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
type_bss_entry_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
boot_image_string_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
string_bss_entry_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
jit_string_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
jit_class_patches_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)),
fixups_to_jump_tables_(graph->GetAllocator()->Adapter(kArenaAllocCodeGenerator)) {
AddAllocatedRegister(Location::RegisterLocation(kFakeReturnRegister));
}
InstructionCodeGeneratorX86_64::InstructionCodeGeneratorX86_64(HGraph* graph,
CodeGeneratorX86_64* codegen)
: InstructionCodeGenerator(graph, codegen),
assembler_(codegen->GetAssembler()),
codegen_(codegen) {}
void CodeGeneratorX86_64::SetupBlockedRegisters() const {
// Stack register is always reserved.
blocked_core_registers_[RSP] = true;
// Block the register used as TMP.
blocked_core_registers_[TMP] = true;
}
static dwarf::Reg DWARFReg(Register reg) {
return dwarf::Reg::X86_64Core(static_cast<int>(reg));
}
static dwarf::Reg DWARFReg(FloatRegister reg) {
return dwarf::Reg::X86_64Fp(static_cast<int>(reg));
}
void CodeGeneratorX86_64::GenerateFrameEntry() {
__ cfi().SetCurrentCFAOffset(kX86_64WordSize); // return address
__ Bind(&frame_entry_label_);
bool skip_overflow_check = IsLeafMethod()
&& !FrameNeedsStackCheck(GetFrameSize(), InstructionSet::kX86_64);
DCHECK(GetCompilerOptions().GetImplicitStackOverflowChecks());
if (GetCompilerOptions().CountHotnessInCompiledCode()) {
__ addw(Address(CpuRegister(kMethodRegisterArgument),
ArtMethod::HotnessCountOffset().Int32Value()),
Immediate(1));
}
if (!skip_overflow_check) {
size_t reserved_bytes = GetStackOverflowReservedBytes(InstructionSet::kX86_64);
__ testq(CpuRegister(RAX), Address(CpuRegister(RSP), -static_cast<int32_t>(reserved_bytes)));
RecordPcInfo(nullptr, 0);
}
if (HasEmptyFrame()) {
return;
}
for (int i = arraysize(kCoreCalleeSaves) - 1; i >= 0; --i) {
Register reg = kCoreCalleeSaves[i];
if (allocated_registers_.ContainsCoreRegister(reg)) {
__ pushq(CpuRegister(reg));
__ cfi().AdjustCFAOffset(kX86_64WordSize);
__ cfi().RelOffset(DWARFReg(reg), 0);
}
}
int adjust = GetFrameSize() - GetCoreSpillSize();
__ subq(CpuRegister(RSP), Immediate(adjust));
__ cfi().AdjustCFAOffset(adjust);
uint32_t xmm_spill_location = GetFpuSpillStart();
size_t xmm_spill_slot_size = GetFloatingPointSpillSlotSize();
for (int i = arraysize(kFpuCalleeSaves) - 1; i >= 0; --i) {
if (allocated_registers_.ContainsFloatingPointRegister(kFpuCalleeSaves[i])) {
int offset = xmm_spill_location + (xmm_spill_slot_size * i);
__ movsd(Address(CpuRegister(RSP), offset), XmmRegister(kFpuCalleeSaves[i]));
__ cfi().RelOffset(DWARFReg(kFpuCalleeSaves[i]), offset);
}
}
// Save the current method if we need it. Note that we do not
// do this in HCurrentMethod, as the instruction might have been removed
// in the SSA graph.
if (RequiresCurrentMethod()) {
__ movq(Address(CpuRegister(RSP), kCurrentMethodStackOffset),
CpuRegister(kMethodRegisterArgument));
}
if (GetGraph()->HasShouldDeoptimizeFlag()) {
// Initialize should_deoptimize flag to 0.
__ movl(Address(CpuRegister(RSP), GetStackOffsetOfShouldDeoptimizeFlag()), Immediate(0));
}
}
void CodeGeneratorX86_64::GenerateFrameExit() {
__ cfi().RememberState();
if (!HasEmptyFrame()) {
uint32_t xmm_spill_location = GetFpuSpillStart();
size_t xmm_spill_slot_size = GetFloatingPointSpillSlotSize();
for (size_t i = 0; i < arraysize(kFpuCalleeSaves); ++i) {
if (allocated_registers_.ContainsFloatingPointRegister(kFpuCalleeSaves[i])) {
int offset = xmm_spill_location + (xmm_spill_slot_size * i);
__ movsd(XmmRegister(kFpuCalleeSaves[i]), Address(CpuRegister(RSP), offset));
__ cfi().Restore(DWARFReg(kFpuCalleeSaves[i]));
}
}
int adjust = GetFrameSize() - GetCoreSpillSize();
__ addq(CpuRegister(RSP), Immediate(adjust));
__ cfi().AdjustCFAOffset(-adjust);
for (size_t i = 0; i < arraysize(kCoreCalleeSaves); ++i) {
Register reg = kCoreCalleeSaves[i];
if (allocated_registers_.ContainsCoreRegister(reg)) {
__ popq(CpuRegister(reg));
__ cfi().AdjustCFAOffset(-static_cast<int>(kX86_64WordSize));
__ cfi().Restore(DWARFReg(reg));
}
}
}
__ ret();
__ cfi().RestoreState();
__ cfi().DefCFAOffset(GetFrameSize());
}
void CodeGeneratorX86_64::Bind(HBasicBlock* block) {
__ Bind(GetLabelOf(block));
}
void CodeGeneratorX86_64::Move(Location destination, Location source) {
if (source.Equals(destination)) {
return;
}
if (destination.IsRegister()) {
CpuRegister dest = destination.AsRegister<CpuRegister>();
if (source.IsRegister()) {
__ movq(dest, source.AsRegister<CpuRegister>());
} else if (source.IsFpuRegister()) {
__ movd(dest, source.AsFpuRegister<XmmRegister>());
} else if (source.IsStackSlot()) {
__ movl(dest, Address(CpuRegister(RSP), source.GetStackIndex()));
} else if (source.IsConstant()) {
HConstant* constant = source.GetConstant();
if (constant->IsLongConstant()) {
Load64BitValue(dest, constant->AsLongConstant()->GetValue());
} else {
Load32BitValue(dest, GetInt32ValueOf(constant));
}
} else {
DCHECK(source.IsDoubleStackSlot());
__ movq(dest, Address(CpuRegister(RSP), source.GetStackIndex()));
}
} else if (destination.IsFpuRegister()) {
XmmRegister dest = destination.AsFpuRegister<XmmRegister>();
if (source.IsRegister()) {
__ movd(dest, source.AsRegister<CpuRegister>());
} else if (source.IsFpuRegister()) {
__ movaps(dest, source.AsFpuRegister<XmmRegister>());
} else if (source.IsConstant()) {
HConstant* constant = source.GetConstant();
int64_t value = CodeGenerator::GetInt64ValueOf(constant);
if (constant->IsFloatConstant()) {
Load32BitValue(dest, static_cast<int32_t>(value));
} else {
Load64BitValue(dest, value);
}
} else if (source.IsStackSlot()) {
__ movss(dest, Address(CpuRegister(RSP), source.GetStackIndex()));
} else {
DCHECK(source.IsDoubleStackSlot());
__ movsd(dest, Address(CpuRegister(RSP), source.GetStackIndex()));
}
} else if (destination.IsStackSlot()) {
if (source.IsRegister()) {
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsRegister<CpuRegister>());
} else if (source.IsFpuRegister()) {
__ movss(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsFpuRegister<XmmRegister>());
} else if (source.IsConstant()) {
HConstant* constant = source.GetConstant();
int32_t value = GetInt32ValueOf(constant);
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()), Immediate(value));
} else {
DCHECK(source.IsStackSlot()) << source;
__ movl(CpuRegister(TMP), Address(CpuRegister(RSP), source.GetStackIndex()));
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()), CpuRegister(TMP));
}
} else {
DCHECK(destination.IsDoubleStackSlot());
if (source.IsRegister()) {
__ movq(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsRegister<CpuRegister>());
} else if (source.IsFpuRegister()) {
__ movsd(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsFpuRegister<XmmRegister>());
} else if (source.IsConstant()) {
HConstant* constant = source.GetConstant();
DCHECK(constant->IsLongConstant() || constant->IsDoubleConstant());
int64_t value = GetInt64ValueOf(constant);
Store64BitValueToStack(destination, value);
} else {
DCHECK(source.IsDoubleStackSlot());
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), source.GetStackIndex()));
__ movq(Address(CpuRegister(RSP), destination.GetStackIndex()), CpuRegister(TMP));
}
}
}
void CodeGeneratorX86_64::MoveConstant(Location location, int32_t value) {
DCHECK(location.IsRegister());
Load64BitValue(location.AsRegister<CpuRegister>(), static_cast<int64_t>(value));
}
void CodeGeneratorX86_64::MoveLocation(
Location dst, Location src, DataType::Type dst_type ATTRIBUTE_UNUSED) {
Move(dst, src);
}
void CodeGeneratorX86_64::AddLocationAsTemp(Location location, LocationSummary* locations) {
if (location.IsRegister()) {
locations->AddTemp(location);
} else {
UNIMPLEMENTED(FATAL) << "AddLocationAsTemp not implemented for location " << location;
}
}
void InstructionCodeGeneratorX86_64::HandleGoto(HInstruction* got, HBasicBlock* successor) {
if (successor->IsExitBlock()) {
DCHECK(got->GetPrevious()->AlwaysThrows());
return; // no code needed
}
HBasicBlock* block = got->GetBlock();
HInstruction* previous = got->GetPrevious();
HLoopInformation* info = block->GetLoopInformation();
if (info != nullptr && info->IsBackEdge(*block) && info->HasSuspendCheck()) {
if (codegen_->GetCompilerOptions().CountHotnessInCompiledCode()) {
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), 0));
__ addw(Address(CpuRegister(TMP), ArtMethod::HotnessCountOffset().Int32Value()),
Immediate(1));
}
GenerateSuspendCheck(info->GetSuspendCheck(), successor);
return;
}
if (block->IsEntryBlock() && (previous != nullptr) && previous->IsSuspendCheck()) {
GenerateSuspendCheck(previous->AsSuspendCheck(), nullptr);
}
if (!codegen_->GoesToNextBlock(got->GetBlock(), successor)) {
__ jmp(codegen_->GetLabelOf(successor));
}
}
void LocationsBuilderX86_64::VisitGoto(HGoto* got) {
got->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86_64::VisitGoto(HGoto* got) {
HandleGoto(got, got->GetSuccessor());
}
void LocationsBuilderX86_64::VisitTryBoundary(HTryBoundary* try_boundary) {
try_boundary->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86_64::VisitTryBoundary(HTryBoundary* try_boundary) {
HBasicBlock* successor = try_boundary->GetNormalFlowSuccessor();
if (!successor->IsExitBlock()) {
HandleGoto(try_boundary, successor);
}
}
void LocationsBuilderX86_64::VisitExit(HExit* exit) {
exit->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86_64::VisitExit(HExit* exit ATTRIBUTE_UNUSED) {
}
template<class LabelType>
void InstructionCodeGeneratorX86_64::GenerateFPJumps(HCondition* cond,
LabelType* true_label,
LabelType* false_label) {
if (cond->IsFPConditionTrueIfNaN()) {
__ j(kUnordered, true_label);
} else if (cond->IsFPConditionFalseIfNaN()) {
__ j(kUnordered, false_label);
}
__ j(X86_64FPCondition(cond->GetCondition()), true_label);
}
void InstructionCodeGeneratorX86_64::GenerateCompareTest(HCondition* condition) {
LocationSummary* locations = condition->GetLocations();
Location left = locations->InAt(0);
Location right = locations->InAt(1);
DataType::Type type = condition->InputAt(0)->GetType();
switch (type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kReference: {
codegen_->GenerateIntCompare(left, right);
break;
}
case DataType::Type::kInt64: {
codegen_->GenerateLongCompare(left, right);
break;
}
case DataType::Type::kFloat32: {
if (right.IsFpuRegister()) {
__ ucomiss(left.AsFpuRegister<XmmRegister>(), right.AsFpuRegister<XmmRegister>());
} else if (right.IsConstant()) {
__ ucomiss(left.AsFpuRegister<XmmRegister>(),
codegen_->LiteralFloatAddress(
right.GetConstant()->AsFloatConstant()->GetValue()));
} else {
DCHECK(right.IsStackSlot());
__ ucomiss(left.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), right.GetStackIndex()));
}
break;
}
case DataType::Type::kFloat64: {
if (right.IsFpuRegister()) {
__ ucomisd(left.AsFpuRegister<XmmRegister>(), right.AsFpuRegister<XmmRegister>());
} else if (right.IsConstant()) {
__ ucomisd(left.AsFpuRegister<XmmRegister>(),
codegen_->LiteralDoubleAddress(
right.GetConstant()->AsDoubleConstant()->GetValue()));
} else {
DCHECK(right.IsDoubleStackSlot());
__ ucomisd(left.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), right.GetStackIndex()));
}
break;
}
default:
LOG(FATAL) << "Unexpected condition type " << type;
}
}
template<class LabelType>
void InstructionCodeGeneratorX86_64::GenerateCompareTestAndBranch(HCondition* condition,
LabelType* true_target_in,
LabelType* false_target_in) {
// Generated branching requires both targets to be explicit. If either of the
// targets is nullptr (fallthrough) use and bind `fallthrough_target` instead.
LabelType fallthrough_target;
LabelType* true_target = true_target_in == nullptr ? &fallthrough_target : true_target_in;
LabelType* false_target = false_target_in == nullptr ? &fallthrough_target : false_target_in;
// Generate the comparison to set the CC.
GenerateCompareTest(condition);
// Now generate the correct jump(s).
DataType::Type type = condition->InputAt(0)->GetType();
switch (type) {
case DataType::Type::kInt64: {
__ j(X86_64IntegerCondition(condition->GetCondition()), true_target);
break;
}
case DataType::Type::kFloat32: {
GenerateFPJumps(condition, true_target, false_target);
break;
}
case DataType::Type::kFloat64: {
GenerateFPJumps(condition, true_target, false_target);
break;
}
default:
LOG(FATAL) << "Unexpected condition type " << type;
}
if (false_target != &fallthrough_target) {
__ jmp(false_target);
}
if (fallthrough_target.IsLinked()) {
__ Bind(&fallthrough_target);
}
}
static bool AreEflagsSetFrom(HInstruction* cond, HInstruction* branch) {
// Moves may affect the eflags register (move zero uses xorl), so the EFLAGS
// are set only strictly before `branch`. We can't use the eflags on long
// conditions if they are materialized due to the complex branching.
return cond->IsCondition() &&
cond->GetNext() == branch &&
!DataType::IsFloatingPointType(cond->InputAt(0)->GetType());
}
template<class LabelType>
void InstructionCodeGeneratorX86_64::GenerateTestAndBranch(HInstruction* instruction,
size_t condition_input_index,
LabelType* true_target,
LabelType* false_target) {
HInstruction* cond = instruction->InputAt(condition_input_index);
if (true_target == nullptr && false_target == nullptr) {
// Nothing to do. The code always falls through.
return;
} else if (cond->IsIntConstant()) {
// Constant condition, statically compared against "true" (integer value 1).
if (cond->AsIntConstant()->IsTrue()) {
if (true_target != nullptr) {
__ jmp(true_target);
}
} else {
DCHECK(cond->AsIntConstant()->IsFalse()) << cond->AsIntConstant()->GetValue();
if (false_target != nullptr) {
__ jmp(false_target);
}
}
return;
}
// The following code generates these patterns:
// (1) true_target == nullptr && false_target != nullptr
// - opposite condition true => branch to false_target
// (2) true_target != nullptr && false_target == nullptr
// - condition true => branch to true_target
// (3) true_target != nullptr && false_target != nullptr
// - condition true => branch to true_target
// - branch to false_target
if (IsBooleanValueOrMaterializedCondition(cond)) {
if (AreEflagsSetFrom(cond, instruction)) {
if (true_target == nullptr) {
__ j(X86_64IntegerCondition(cond->AsCondition()->GetOppositeCondition()), false_target);
} else {
__ j(X86_64IntegerCondition(cond->AsCondition()->GetCondition()), true_target);
}
} else {
// Materialized condition, compare against 0.
Location lhs = instruction->GetLocations()->InAt(condition_input_index);
if (lhs.IsRegister()) {
__ testl(lhs.AsRegister<CpuRegister>(), lhs.AsRegister<CpuRegister>());
} else {
__ cmpl(Address(CpuRegister(RSP), lhs.GetStackIndex()), Immediate(0));
}
if (true_target == nullptr) {
__ j(kEqual, false_target);
} else {
__ j(kNotEqual, true_target);
}
}
} else {
// Condition has not been materialized, use its inputs as the
// comparison and its condition as the branch condition.
HCondition* condition = cond->AsCondition();
// If this is a long or FP comparison that has been folded into
// the HCondition, generate the comparison directly.
DataType::Type type = condition->InputAt(0)->GetType();
if (type == DataType::Type::kInt64 || DataType::IsFloatingPointType(type)) {
GenerateCompareTestAndBranch(condition, true_target, false_target);
return;
}
Location lhs = condition->GetLocations()->InAt(0);
Location rhs = condition->GetLocations()->InAt(1);
codegen_->GenerateIntCompare(lhs, rhs);
if (true_target == nullptr) {
__ j(X86_64IntegerCondition(condition->GetOppositeCondition()), false_target);
} else {
__ j(X86_64IntegerCondition(condition->GetCondition()), true_target);
}
}
// If neither branch falls through (case 3), the conditional branch to `true_target`
// was already emitted (case 2) and we need to emit a jump to `false_target`.
if (true_target != nullptr && false_target != nullptr) {
__ jmp(false_target);
}
}
void LocationsBuilderX86_64::VisitIf(HIf* if_instr) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(if_instr);
if (IsBooleanValueOrMaterializedCondition(if_instr->InputAt(0))) {
locations->SetInAt(0, Location::Any());
}
}
void InstructionCodeGeneratorX86_64::VisitIf(HIf* if_instr) {
HBasicBlock* true_successor = if_instr->IfTrueSuccessor();
HBasicBlock* false_successor = if_instr->IfFalseSuccessor();
Label* true_target = codegen_->GoesToNextBlock(if_instr->GetBlock(), true_successor) ?
nullptr : codegen_->GetLabelOf(true_successor);
Label* false_target = codegen_->GoesToNextBlock(if_instr->GetBlock(), false_successor) ?
nullptr : codegen_->GetLabelOf(false_successor);
GenerateTestAndBranch(if_instr, /* condition_input_index */ 0, true_target, false_target);
}
void LocationsBuilderX86_64::VisitDeoptimize(HDeoptimize* deoptimize) {
LocationSummary* locations = new (GetGraph()->GetAllocator())
LocationSummary(deoptimize, LocationSummary::kCallOnSlowPath);
InvokeRuntimeCallingConvention calling_convention;
RegisterSet caller_saves = RegisterSet::Empty();
caller_saves.Add(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
locations->SetCustomSlowPathCallerSaves(caller_saves);
if (IsBooleanValueOrMaterializedCondition(deoptimize->InputAt(0))) {
locations->SetInAt(0, Location::Any());
}
}
void InstructionCodeGeneratorX86_64::VisitDeoptimize(HDeoptimize* deoptimize) {
SlowPathCode* slow_path = deopt_slow_paths_.NewSlowPath<DeoptimizationSlowPathX86_64>(deoptimize);
GenerateTestAndBranch<Label>(deoptimize,
/* condition_input_index */ 0,
slow_path->GetEntryLabel(),
/* false_target */ nullptr);
}
void LocationsBuilderX86_64::VisitShouldDeoptimizeFlag(HShouldDeoptimizeFlag* flag) {
LocationSummary* locations = new (GetGraph()->GetAllocator())
LocationSummary(flag, LocationSummary::kNoCall);
locations->SetOut(Location::RequiresRegister());
}
void InstructionCodeGeneratorX86_64::VisitShouldDeoptimizeFlag(HShouldDeoptimizeFlag* flag) {
__ movl(flag->GetLocations()->Out().AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), codegen_->GetStackOffsetOfShouldDeoptimizeFlag()));
}
static bool SelectCanUseCMOV(HSelect* select) {
// There are no conditional move instructions for XMMs.
if (DataType::IsFloatingPointType(select->GetType())) {
return false;
}
// A FP condition doesn't generate the single CC that we need.
HInstruction* condition = select->GetCondition();
if (condition->IsCondition() &&
DataType::IsFloatingPointType(condition->InputAt(0)->GetType())) {
return false;
}
// We can generate a CMOV for this Select.
return true;
}
void LocationsBuilderX86_64::VisitSelect(HSelect* select) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(select);
if (DataType::IsFloatingPointType(select->GetType())) {
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
} else {
locations->SetInAt(0, Location::RequiresRegister());
if (SelectCanUseCMOV(select)) {
if (select->InputAt(1)->IsConstant()) {
locations->SetInAt(1, Location::RequiresRegister());
} else {
locations->SetInAt(1, Location::Any());
}
} else {
locations->SetInAt(1, Location::Any());
}
}
if (IsBooleanValueOrMaterializedCondition(select->GetCondition())) {
locations->SetInAt(2, Location::RequiresRegister());
}
locations->SetOut(Location::SameAsFirstInput());
}
void InstructionCodeGeneratorX86_64::VisitSelect(HSelect* select) {
LocationSummary* locations = select->GetLocations();
if (SelectCanUseCMOV(select)) {
// If both the condition and the source types are integer, we can generate
// a CMOV to implement Select.
CpuRegister value_false = locations->InAt(0).AsRegister<CpuRegister>();
Location value_true_loc = locations->InAt(1);
DCHECK(locations->InAt(0).Equals(locations->Out()));
HInstruction* select_condition = select->GetCondition();
Condition cond = kNotEqual;
// Figure out how to test the 'condition'.
if (select_condition->IsCondition()) {
HCondition* condition = select_condition->AsCondition();
if (!condition->IsEmittedAtUseSite()) {
// This was a previously materialized condition.
// Can we use the existing condition code?
if (AreEflagsSetFrom(condition, select)) {
// Materialization was the previous instruction. Condition codes are right.
cond = X86_64IntegerCondition(condition->GetCondition());
} else {
// No, we have to recreate the condition code.
CpuRegister cond_reg = locations->InAt(2).AsRegister<CpuRegister>();
__ testl(cond_reg, cond_reg);
}
} else {
GenerateCompareTest(condition);
cond = X86_64IntegerCondition(condition->GetCondition());
}
} else {
// Must be a Boolean condition, which needs to be compared to 0.
CpuRegister cond_reg = locations->InAt(2).AsRegister<CpuRegister>();
__ testl(cond_reg, cond_reg);
}
// If the condition is true, overwrite the output, which already contains false.
// Generate the correct sized CMOV.
bool is_64_bit = DataType::Is64BitType(select->GetType());
if (value_true_loc.IsRegister()) {
__ cmov(cond, value_false, value_true_loc.AsRegister<CpuRegister>(), is_64_bit);
} else {
__ cmov(cond,
value_false,
Address(CpuRegister(RSP), value_true_loc.GetStackIndex()), is_64_bit);
}
} else {
NearLabel false_target;
GenerateTestAndBranch<NearLabel>(select,
/* condition_input_index */ 2,
/* true_target */ nullptr,
&false_target);
codegen_->MoveLocation(locations->Out(), locations->InAt(1), select->GetType());
__ Bind(&false_target);
}
}
void LocationsBuilderX86_64::VisitNativeDebugInfo(HNativeDebugInfo* info) {
new (GetGraph()->GetAllocator()) LocationSummary(info);
}
void InstructionCodeGeneratorX86_64::VisitNativeDebugInfo(HNativeDebugInfo*) {
// MaybeRecordNativeDebugInfo is already called implicitly in CodeGenerator::Compile.
}
void CodeGeneratorX86_64::GenerateNop() {
__ nop();
}
void LocationsBuilderX86_64::HandleCondition(HCondition* cond) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(cond, LocationSummary::kNoCall);
// Handle the long/FP comparisons made in instruction simplification.
switch (cond->InputAt(0)->GetType()) {
case DataType::Type::kInt64:
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
break;
case DataType::Type::kFloat32:
case DataType::Type::kFloat64:
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
break;
default:
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
break;
}
if (!cond->IsEmittedAtUseSite()) {
locations->SetOut(Location::RequiresRegister());
}
}
void InstructionCodeGeneratorX86_64::HandleCondition(HCondition* cond) {
if (cond->IsEmittedAtUseSite()) {
return;
}
LocationSummary* locations = cond->GetLocations();
Location lhs = locations->InAt(0);
Location rhs = locations->InAt(1);
CpuRegister reg = locations->Out().AsRegister<CpuRegister>();
NearLabel true_label, false_label;
switch (cond->InputAt(0)->GetType()) {
default:
// Integer case.
// Clear output register: setcc only sets the low byte.
__ xorl(reg, reg);
codegen_->GenerateIntCompare(lhs, rhs);
__ setcc(X86_64IntegerCondition(cond->GetCondition()), reg);
return;
case DataType::Type::kInt64:
// Clear output register: setcc only sets the low byte.
__ xorl(reg, reg);
codegen_->GenerateLongCompare(lhs, rhs);
__ setcc(X86_64IntegerCondition(cond->GetCondition()), reg);
return;
case DataType::Type::kFloat32: {
XmmRegister lhs_reg = lhs.AsFpuRegister<XmmRegister>();
if (rhs.IsConstant()) {
float value = rhs.GetConstant()->AsFloatConstant()->GetValue();
__ ucomiss(lhs_reg, codegen_->LiteralFloatAddress(value));
} else if (rhs.IsStackSlot()) {
__ ucomiss(lhs_reg, Address(CpuRegister(RSP), rhs.GetStackIndex()));
} else {
__ ucomiss(lhs_reg, rhs.AsFpuRegister<XmmRegister>());
}
GenerateFPJumps(cond, &true_label, &false_label);
break;
}
case DataType::Type::kFloat64: {
XmmRegister lhs_reg = lhs.AsFpuRegister<XmmRegister>();
if (rhs.IsConstant()) {
double value = rhs.GetConstant()->AsDoubleConstant()->GetValue();
__ ucomisd(lhs_reg, codegen_->LiteralDoubleAddress(value));
} else if (rhs.IsDoubleStackSlot()) {
__ ucomisd(lhs_reg, Address(CpuRegister(RSP), rhs.GetStackIndex()));
} else {
__ ucomisd(lhs_reg, rhs.AsFpuRegister<XmmRegister>());
}
GenerateFPJumps(cond, &true_label, &false_label);
break;
}
}
// Convert the jumps into the result.
NearLabel done_label;
// False case: result = 0.
__ Bind(&false_label);
__ xorl(reg, reg);
__ jmp(&done_label);
// True case: result = 1.
__ Bind(&true_label);
__ movl(reg, Immediate(1));
__ Bind(&done_label);
}
void LocationsBuilderX86_64::VisitEqual(HEqual* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitEqual(HEqual* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitNotEqual(HNotEqual* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitNotEqual(HNotEqual* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitLessThan(HLessThan* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitLessThan(HLessThan* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitLessThanOrEqual(HLessThanOrEqual* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitLessThanOrEqual(HLessThanOrEqual* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitGreaterThan(HGreaterThan* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitGreaterThan(HGreaterThan* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitGreaterThanOrEqual(HGreaterThanOrEqual* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitGreaterThanOrEqual(HGreaterThanOrEqual* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitBelow(HBelow* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitBelow(HBelow* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitBelowOrEqual(HBelowOrEqual* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitBelowOrEqual(HBelowOrEqual* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitAbove(HAbove* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitAbove(HAbove* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitAboveOrEqual(HAboveOrEqual* comp) {
HandleCondition(comp);
}
void InstructionCodeGeneratorX86_64::VisitAboveOrEqual(HAboveOrEqual* comp) {
HandleCondition(comp);
}
void LocationsBuilderX86_64::VisitCompare(HCompare* compare) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(compare, LocationSummary::kNoCall);
switch (compare->InputAt(0)->GetType()) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
break;
}
case DataType::Type::kFloat32:
case DataType::Type::kFloat64: {
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::RequiresRegister());
break;
}
default:
LOG(FATAL) << "Unexpected type for compare operation " << compare->InputAt(0)->GetType();
}
}
void InstructionCodeGeneratorX86_64::VisitCompare(HCompare* compare) {
LocationSummary* locations = compare->GetLocations();
CpuRegister out = locations->Out().AsRegister<CpuRegister>();
Location left = locations->InAt(0);
Location right = locations->InAt(1);
NearLabel less, greater, done;
DataType::Type type = compare->InputAt(0)->GetType();
Condition less_cond = kLess;
switch (type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32: {
codegen_->GenerateIntCompare(left, right);
break;
}
case DataType::Type::kInt64: {
codegen_->GenerateLongCompare(left, right);
break;
}
case DataType::Type::kFloat32: {
XmmRegister left_reg = left.AsFpuRegister<XmmRegister>();
if (right.IsConstant()) {
float value = right.GetConstant()->AsFloatConstant()->GetValue();
__ ucomiss(left_reg, codegen_->LiteralFloatAddress(value));
} else if (right.IsStackSlot()) {
__ ucomiss(left_reg, Address(CpuRegister(RSP), right.GetStackIndex()));
} else {
__ ucomiss(left_reg, right.AsFpuRegister<XmmRegister>());
}
__ j(kUnordered, compare->IsGtBias() ? &greater : &less);
less_cond = kBelow; // ucomis{s,d} sets CF
break;
}
case DataType::Type::kFloat64: {
XmmRegister left_reg = left.AsFpuRegister<XmmRegister>();
if (right.IsConstant()) {
double value = right.GetConstant()->AsDoubleConstant()->GetValue();
__ ucomisd(left_reg, codegen_->LiteralDoubleAddress(value));
} else if (right.IsDoubleStackSlot()) {
__ ucomisd(left_reg, Address(CpuRegister(RSP), right.GetStackIndex()));
} else {
__ ucomisd(left_reg, right.AsFpuRegister<XmmRegister>());
}
__ j(kUnordered, compare->IsGtBias() ? &greater : &less);
less_cond = kBelow; // ucomis{s,d} sets CF
break;
}
default:
LOG(FATAL) << "Unexpected compare type " << type;
}
__ movl(out, Immediate(0));
__ j(kEqual, &done);
__ j(less_cond, &less);
__ Bind(&greater);
__ movl(out, Immediate(1));
__ jmp(&done);
__ Bind(&less);
__ movl(out, Immediate(-1));
__ Bind(&done);
}
void LocationsBuilderX86_64::VisitIntConstant(HIntConstant* constant) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(constant, LocationSummary::kNoCall);
locations->SetOut(Location::ConstantLocation(constant));
}
void InstructionCodeGeneratorX86_64::VisitIntConstant(HIntConstant* constant ATTRIBUTE_UNUSED) {
// Will be generated at use site.
}
void LocationsBuilderX86_64::VisitNullConstant(HNullConstant* constant) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(constant, LocationSummary::kNoCall);
locations->SetOut(Location::ConstantLocation(constant));
}
void InstructionCodeGeneratorX86_64::VisitNullConstant(HNullConstant* constant ATTRIBUTE_UNUSED) {
// Will be generated at use site.
}
void LocationsBuilderX86_64::VisitLongConstant(HLongConstant* constant) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(constant, LocationSummary::kNoCall);
locations->SetOut(Location::ConstantLocation(constant));
}
void InstructionCodeGeneratorX86_64::VisitLongConstant(HLongConstant* constant ATTRIBUTE_UNUSED) {
// Will be generated at use site.
}
void LocationsBuilderX86_64::VisitFloatConstant(HFloatConstant* constant) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(constant, LocationSummary::kNoCall);
locations->SetOut(Location::ConstantLocation(constant));
}
void InstructionCodeGeneratorX86_64::VisitFloatConstant(HFloatConstant* constant ATTRIBUTE_UNUSED) {
// Will be generated at use site.
}
void LocationsBuilderX86_64::VisitDoubleConstant(HDoubleConstant* constant) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(constant, LocationSummary::kNoCall);
locations->SetOut(Location::ConstantLocation(constant));
}
void InstructionCodeGeneratorX86_64::VisitDoubleConstant(
HDoubleConstant* constant ATTRIBUTE_UNUSED) {
// Will be generated at use site.
}
void LocationsBuilderX86_64::VisitConstructorFence(HConstructorFence* constructor_fence) {
constructor_fence->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86_64::VisitConstructorFence(
HConstructorFence* constructor_fence ATTRIBUTE_UNUSED) {
codegen_->GenerateMemoryBarrier(MemBarrierKind::kStoreStore);
}
void LocationsBuilderX86_64::VisitMemoryBarrier(HMemoryBarrier* memory_barrier) {
memory_barrier->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86_64::VisitMemoryBarrier(HMemoryBarrier* memory_barrier) {
codegen_->GenerateMemoryBarrier(memory_barrier->GetBarrierKind());
}
void LocationsBuilderX86_64::VisitReturnVoid(HReturnVoid* ret) {
ret->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86_64::VisitReturnVoid(HReturnVoid* ret ATTRIBUTE_UNUSED) {
codegen_->GenerateFrameExit();
}
void LocationsBuilderX86_64::VisitReturn(HReturn* ret) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(ret, LocationSummary::kNoCall);
switch (ret->InputAt(0)->GetType()) {
case DataType::Type::kReference:
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kInt64:
locations->SetInAt(0, Location::RegisterLocation(RAX));
break;
case DataType::Type::kFloat32:
case DataType::Type::kFloat64:
locations->SetInAt(0, Location::FpuRegisterLocation(XMM0));
break;
default:
LOG(FATAL) << "Unexpected return type " << ret->InputAt(0)->GetType();
}
}
void InstructionCodeGeneratorX86_64::VisitReturn(HReturn* ret) {
if (kIsDebugBuild) {
switch (ret->InputAt(0)->GetType()) {
case DataType::Type::kReference:
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kInt64:
DCHECK_EQ(ret->GetLocations()->InAt(0).AsRegister<CpuRegister>().AsRegister(), RAX);
break;
case DataType::Type::kFloat32:
case DataType::Type::kFloat64:
DCHECK_EQ(ret->GetLocations()->InAt(0).AsFpuRegister<XmmRegister>().AsFloatRegister(),
XMM0);
break;
default:
LOG(FATAL) << "Unexpected return type " << ret->InputAt(0)->GetType();
}
}
codegen_->GenerateFrameExit();
}
Location InvokeDexCallingConventionVisitorX86_64::GetReturnLocation(DataType::Type type) const {
switch (type) {
case DataType::Type::kReference:
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kUint32:
case DataType::Type::kInt32:
case DataType::Type::kUint64:
case DataType::Type::kInt64:
return Location::RegisterLocation(RAX);
case DataType::Type::kVoid:
return Location::NoLocation();
case DataType::Type::kFloat64:
case DataType::Type::kFloat32:
return Location::FpuRegisterLocation(XMM0);
}
UNREACHABLE();
}
Location InvokeDexCallingConventionVisitorX86_64::GetMethodLocation() const {
return Location::RegisterLocation(kMethodRegisterArgument);
}
Location InvokeDexCallingConventionVisitorX86_64::GetNextLocation(DataType::Type type) {
switch (type) {
case DataType::Type::kReference:
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32: {
uint32_t index = gp_index_++;
stack_index_++;
if (index < calling_convention.GetNumberOfRegisters()) {
return Location::RegisterLocation(calling_convention.GetRegisterAt(index));
} else {
return Location::StackSlot(calling_convention.GetStackOffsetOf(stack_index_ - 1));
}
}
case DataType::Type::kInt64: {
uint32_t index = gp_index_;
stack_index_ += 2;
if (index < calling_convention.GetNumberOfRegisters()) {
gp_index_ += 1;
return Location::RegisterLocation(calling_convention.GetRegisterAt(index));
} else {
gp_index_ += 2;
return Location::DoubleStackSlot(calling_convention.GetStackOffsetOf(stack_index_ - 2));
}
}
case DataType::Type::kFloat32: {
uint32_t index = float_index_++;
stack_index_++;
if (index < calling_convention.GetNumberOfFpuRegisters()) {
return Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(index));
} else {
return Location::StackSlot(calling_convention.GetStackOffsetOf(stack_index_ - 1));
}
}
case DataType::Type::kFloat64: {
uint32_t index = float_index_++;
stack_index_ += 2;
if (index < calling_convention.GetNumberOfFpuRegisters()) {
return Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(index));
} else {
return Location::DoubleStackSlot(calling_convention.GetStackOffsetOf(stack_index_ - 2));
}
}
case DataType::Type::kUint32:
case DataType::Type::kUint64:
case DataType::Type::kVoid:
LOG(FATAL) << "Unexpected parameter type " << type;
break;
}
return Location::NoLocation();
}
void LocationsBuilderX86_64::VisitInvokeUnresolved(HInvokeUnresolved* invoke) {
// The trampoline uses the same calling convention as dex calling conventions,
// except instead of loading arg0/r0 with the target Method*, arg0/r0 will contain
// the method_idx.
HandleInvoke(invoke);
}
void InstructionCodeGeneratorX86_64::VisitInvokeUnresolved(HInvokeUnresolved* invoke) {
codegen_->GenerateInvokeUnresolvedRuntimeCall(invoke);
}
void LocationsBuilderX86_64::VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) {
// Explicit clinit checks triggered by static invokes must have been pruned by
// art::PrepareForRegisterAllocation.
DCHECK(!invoke->IsStaticWithExplicitClinitCheck());
IntrinsicLocationsBuilderX86_64 intrinsic(codegen_);
if (intrinsic.TryDispatch(invoke)) {
return;
}
HandleInvoke(invoke);
}
static bool TryGenerateIntrinsicCode(HInvoke* invoke, CodeGeneratorX86_64* codegen) {
if (invoke->GetLocations()->Intrinsified()) {
IntrinsicCodeGeneratorX86_64 intrinsic(codegen);
intrinsic.Dispatch(invoke);
return true;
}
return false;
}
void InstructionCodeGeneratorX86_64::VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) {
// Explicit clinit checks triggered by static invokes must have been pruned by
// art::PrepareForRegisterAllocation.
DCHECK(!invoke->IsStaticWithExplicitClinitCheck());
if (TryGenerateIntrinsicCode(invoke, codegen_)) {
return;
}
LocationSummary* locations = invoke->GetLocations();
codegen_->GenerateStaticOrDirectCall(
invoke, locations->HasTemps() ? locations->GetTemp(0) : Location::NoLocation());
}
void LocationsBuilderX86_64::HandleInvoke(HInvoke* invoke) {
InvokeDexCallingConventionVisitorX86_64 calling_convention_visitor;
CodeGenerator::CreateCommonInvokeLocationSummary(invoke, &calling_convention_visitor);
}
void LocationsBuilderX86_64::VisitInvokeVirtual(HInvokeVirtual* invoke) {
IntrinsicLocationsBuilderX86_64 intrinsic(codegen_);
if (intrinsic.TryDispatch(invoke)) {
return;
}
HandleInvoke(invoke);
}
void InstructionCodeGeneratorX86_64::VisitInvokeVirtual(HInvokeVirtual* invoke) {
if (TryGenerateIntrinsicCode(invoke, codegen_)) {
return;
}
codegen_->GenerateVirtualCall(invoke, invoke->GetLocations()->GetTemp(0));
DCHECK(!codegen_->IsLeafMethod());
}
void LocationsBuilderX86_64::VisitInvokeInterface(HInvokeInterface* invoke) {
HandleInvoke(invoke);
// Add the hidden argument.
invoke->GetLocations()->AddTemp(Location::RegisterLocation(RAX));
}
void InstructionCodeGeneratorX86_64::VisitInvokeInterface(HInvokeInterface* invoke) {
// TODO: b/18116999, our IMTs can miss an IncompatibleClassChangeError.
LocationSummary* locations = invoke->GetLocations();
CpuRegister temp = locations->GetTemp(0).AsRegister<CpuRegister>();
CpuRegister hidden_reg = locations->GetTemp(1).AsRegister<CpuRegister>();
Location receiver = locations->InAt(0);
size_t class_offset = mirror::Object::ClassOffset().SizeValue();
// Set the hidden argument. This is safe to do this here, as RAX
// won't be modified thereafter, before the `call` instruction.
DCHECK_EQ(RAX, hidden_reg.AsRegister());
codegen_->Load64BitValue(hidden_reg, invoke->GetDexMethodIndex());
if (receiver.IsStackSlot()) {
__ movl(temp, Address(CpuRegister(RSP), receiver.GetStackIndex()));
// /* HeapReference<Class> */ temp = temp->klass_
__ movl(temp, Address(temp, class_offset));
} else {
// /* HeapReference<Class> */ temp = receiver->klass_
__ movl(temp, Address(receiver.AsRegister<CpuRegister>(), class_offset));
}
codegen_->MaybeRecordImplicitNullCheck(invoke);
// Instead of simply (possibly) unpoisoning `temp` here, we should
// emit a read barrier for the previous class reference load.
// However this is not required in practice, as this is an
// intermediate/temporary reference and because the current
// concurrent copying collector keeps the from-space memory
// intact/accessible until the end of the marking phase (the
// concurrent copying collector may not in the future).
__ MaybeUnpoisonHeapReference(temp);
// temp = temp->GetAddressOfIMT()
__ movq(temp,
Address(temp, mirror::Class::ImtPtrOffset(kX86_64PointerSize).Uint32Value()));
// temp = temp->GetImtEntryAt(method_offset);
uint32_t method_offset = static_cast<uint32_t>(ImTable::OffsetOfElement(
invoke->GetImtIndex(), kX86_64PointerSize));
// temp = temp->GetImtEntryAt(method_offset);
__ movq(temp, Address(temp, method_offset));
// call temp->GetEntryPoint();
__ call(Address(
temp, ArtMethod::EntryPointFromQuickCompiledCodeOffset(kX86_64PointerSize).SizeValue()));
DCHECK(!codegen_->IsLeafMethod());
codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
}
void LocationsBuilderX86_64::VisitInvokePolymorphic(HInvokePolymorphic* invoke) {
HandleInvoke(invoke);
}
void InstructionCodeGeneratorX86_64::VisitInvokePolymorphic(HInvokePolymorphic* invoke) {
codegen_->GenerateInvokePolymorphicCall(invoke);
}
void LocationsBuilderX86_64::VisitNeg(HNeg* neg) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(neg, LocationSummary::kNoCall);
switch (neg->GetResultType()) {
case DataType::Type::kInt32:
case DataType::Type::kInt64:
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::SameAsFirstInput());
break;
case DataType::Type::kFloat32:
case DataType::Type::kFloat64:
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetOut(Location::SameAsFirstInput());
locations->AddTemp(Location::RequiresFpuRegister());
break;
default:
LOG(FATAL) << "Unexpected neg type " << neg->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::VisitNeg(HNeg* neg) {
LocationSummary* locations = neg->GetLocations();
Location out = locations->Out();
Location in = locations->InAt(0);
switch (neg->GetResultType()) {
case DataType::Type::kInt32:
DCHECK(in.IsRegister());
DCHECK(in.Equals(out));
__ negl(out.AsRegister<CpuRegister>());
break;
case DataType::Type::kInt64:
DCHECK(in.IsRegister());
DCHECK(in.Equals(out));
__ negq(out.AsRegister<CpuRegister>());
break;
case DataType::Type::kFloat32: {
DCHECK(in.Equals(out));
XmmRegister mask = locations->GetTemp(0).AsFpuRegister<XmmRegister>();
// Implement float negation with an exclusive or with value
// 0x80000000 (mask for bit 31, representing the sign of a
// single-precision floating-point number).
__ movss(mask, codegen_->LiteralInt32Address(0x80000000));
__ xorps(out.AsFpuRegister<XmmRegister>(), mask);
break;
}
case DataType::Type::kFloat64: {
DCHECK(in.Equals(out));
XmmRegister mask = locations->GetTemp(0).AsFpuRegister<XmmRegister>();
// Implement double negation with an exclusive or with value
// 0x8000000000000000 (mask for bit 63, representing the sign of
// a double-precision floating-point number).
__ movsd(mask, codegen_->LiteralInt64Address(INT64_C(0x8000000000000000)));
__ xorpd(out.AsFpuRegister<XmmRegister>(), mask);
break;
}
default:
LOG(FATAL) << "Unexpected neg type " << neg->GetResultType();
}
}
void LocationsBuilderX86_64::VisitTypeConversion(HTypeConversion* conversion) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(conversion, LocationSummary::kNoCall);
DataType::Type result_type = conversion->GetResultType();
DataType::Type input_type = conversion->GetInputType();
DCHECK(!DataType::IsTypeConversionImplicit(input_type, result_type))
<< input_type << " -> " << result_type;
switch (result_type) {
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
DCHECK(DataType::IsIntegralType(input_type)) << input_type;
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
break;
case DataType::Type::kInt32:
switch (input_type) {
case DataType::Type::kInt64:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
break;
case DataType::Type::kFloat32:
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetOut(Location::RequiresRegister());
break;
case DataType::Type::kFloat64:
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetOut(Location::RequiresRegister());
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kInt64:
switch (input_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
// TODO: We would benefit from a (to-be-implemented)
// Location::RegisterOrStackSlot requirement for this input.
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::RequiresRegister());
break;
case DataType::Type::kFloat32:
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetOut(Location::RequiresRegister());
break;
case DataType::Type::kFloat64:
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetOut(Location::RequiresRegister());
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kFloat32:
switch (input_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresFpuRegister());
break;
case DataType::Type::kInt64:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresFpuRegister());
break;
case DataType::Type::kFloat64:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kFloat64:
switch (input_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresFpuRegister());
break;
case DataType::Type::kInt64:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresFpuRegister());
break;
case DataType::Type::kFloat32:
locations->SetInAt(0, Location::Any());
locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
}
void InstructionCodeGeneratorX86_64::VisitTypeConversion(HTypeConversion* conversion) {
LocationSummary* locations = conversion->GetLocations();
Location out = locations->Out();
Location in = locations->InAt(0);
DataType::Type result_type = conversion->GetResultType();
DataType::Type input_type = conversion->GetInputType();
DCHECK(!DataType::IsTypeConversionImplicit(input_type, result_type))
<< input_type << " -> " << result_type;
switch (result_type) {
case DataType::Type::kUint8:
switch (input_type) {
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ movzxb(out.AsRegister<CpuRegister>(), in.AsRegister<CpuRegister>());
} else if (in.IsStackSlot() || in.IsDoubleStackSlot()) {
__ movzxb(out.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
} else {
__ movl(out.AsRegister<CpuRegister>(),
Immediate(static_cast<uint8_t>(Int64FromConstant(in.GetConstant()))));
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kInt8:
switch (input_type) {
case DataType::Type::kUint8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ movsxb(out.AsRegister<CpuRegister>(), in.AsRegister<CpuRegister>());
} else if (in.IsStackSlot() || in.IsDoubleStackSlot()) {
__ movsxb(out.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
} else {
__ movl(out.AsRegister<CpuRegister>(),
Immediate(static_cast<int8_t>(Int64FromConstant(in.GetConstant()))));
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kUint16:
switch (input_type) {
case DataType::Type::kInt8:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ movzxw(out.AsRegister<CpuRegister>(), in.AsRegister<CpuRegister>());
} else if (in.IsStackSlot() || in.IsDoubleStackSlot()) {
__ movzxw(out.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
} else {
__ movl(out.AsRegister<CpuRegister>(),
Immediate(static_cast<uint16_t>(Int64FromConstant(in.GetConstant()))));
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kInt16:
switch (input_type) {
case DataType::Type::kUint16:
case DataType::Type::kInt32:
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ movsxw(out.AsRegister<CpuRegister>(), in.AsRegister<CpuRegister>());
} else if (in.IsStackSlot() || in.IsDoubleStackSlot()) {
__ movsxw(out.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
} else {
__ movl(out.AsRegister<CpuRegister>(),
Immediate(static_cast<int16_t>(Int64FromConstant(in.GetConstant()))));
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kInt32:
switch (input_type) {
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ movl(out.AsRegister<CpuRegister>(), in.AsRegister<CpuRegister>());
} else if (in.IsDoubleStackSlot()) {
__ movl(out.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
} else {
DCHECK(in.IsConstant());
DCHECK(in.GetConstant()->IsLongConstant());
int64_t value = in.GetConstant()->AsLongConstant()->GetValue();
__ movl(out.AsRegister<CpuRegister>(), Immediate(static_cast<int32_t>(value)));
}
break;
case DataType::Type::kFloat32: {
XmmRegister input = in.AsFpuRegister<XmmRegister>();
CpuRegister output = out.AsRegister<CpuRegister>();
NearLabel done, nan;
__ movl(output, Immediate(kPrimIntMax));
// if input >= (float)INT_MAX goto done
__ comiss(input, codegen_->LiteralFloatAddress(kPrimIntMax));
__ j(kAboveEqual, &done);
// if input == NaN goto nan
__ j(kUnordered, &nan);
// output = float-to-int-truncate(input)
__ cvttss2si(output, input, false);
__ jmp(&done);
__ Bind(&nan);
// output = 0
__ xorl(output, output);
__ Bind(&done);
break;
}
case DataType::Type::kFloat64: {
XmmRegister input = in.AsFpuRegister<XmmRegister>();
CpuRegister output = out.AsRegister<CpuRegister>();
NearLabel done, nan;
__ movl(output, Immediate(kPrimIntMax));
// if input >= (double)INT_MAX goto done
__ comisd(input, codegen_->LiteralDoubleAddress(kPrimIntMax));
__ j(kAboveEqual, &done);
// if input == NaN goto nan
__ j(kUnordered, &nan);
// output = double-to-int-truncate(input)
__ cvttsd2si(output, input);
__ jmp(&done);
__ Bind(&nan);
// output = 0
__ xorl(output, output);
__ Bind(&done);
break;
}
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kInt64:
switch (input_type) {
DCHECK(out.IsRegister());
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
DCHECK(in.IsRegister());
__ movsxd(out.AsRegister<CpuRegister>(), in.AsRegister<CpuRegister>());
break;
case DataType::Type::kFloat32: {
XmmRegister input = in.AsFpuRegister<XmmRegister>();
CpuRegister output = out.AsRegister<CpuRegister>();
NearLabel done, nan;
codegen_->Load64BitValue(output, kPrimLongMax);
// if input >= (float)LONG_MAX goto done
__ comiss(input, codegen_->LiteralFloatAddress(kPrimLongMax));
__ j(kAboveEqual, &done);
// if input == NaN goto nan
__ j(kUnordered, &nan);
// output = float-to-long-truncate(input)
__ cvttss2si(output, input, true);
__ jmp(&done);
__ Bind(&nan);
// output = 0
__ xorl(output, output);
__ Bind(&done);
break;
}
case DataType::Type::kFloat64: {
XmmRegister input = in.AsFpuRegister<XmmRegister>();
CpuRegister output = out.AsRegister<CpuRegister>();
NearLabel done, nan;
codegen_->Load64BitValue(output, kPrimLongMax);
// if input >= (double)LONG_MAX goto done
__ comisd(input, codegen_->LiteralDoubleAddress(kPrimLongMax));
__ j(kAboveEqual, &done);
// if input == NaN goto nan
__ j(kUnordered, &nan);
// output = double-to-long-truncate(input)
__ cvttsd2si(output, input, true);
__ jmp(&done);
__ Bind(&nan);
// output = 0
__ xorl(output, output);
__ Bind(&done);
break;
}
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kFloat32:
switch (input_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
if (in.IsRegister()) {
__ cvtsi2ss(out.AsFpuRegister<XmmRegister>(), in.AsRegister<CpuRegister>(), false);
} else if (in.IsConstant()) {
int32_t v = in.GetConstant()->AsIntConstant()->GetValue();
XmmRegister dest = out.AsFpuRegister<XmmRegister>();
codegen_->Load32BitValue(dest, static_cast<float>(v));
} else {
__ cvtsi2ss(out.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()), false);
}
break;
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ cvtsi2ss(out.AsFpuRegister<XmmRegister>(), in.AsRegister<CpuRegister>(), true);
} else if (in.IsConstant()) {
int64_t v = in.GetConstant()->AsLongConstant()->GetValue();
XmmRegister dest = out.AsFpuRegister<XmmRegister>();
codegen_->Load32BitValue(dest, static_cast<float>(v));
} else {
__ cvtsi2ss(out.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()), true);
}
break;
case DataType::Type::kFloat64:
if (in.IsFpuRegister()) {
__ cvtsd2ss(out.AsFpuRegister<XmmRegister>(), in.AsFpuRegister<XmmRegister>());
} else if (in.IsConstant()) {
double v = in.GetConstant()->AsDoubleConstant()->GetValue();
XmmRegister dest = out.AsFpuRegister<XmmRegister>();
codegen_->Load32BitValue(dest, static_cast<float>(v));
} else {
__ cvtsd2ss(out.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
case DataType::Type::kFloat64:
switch (input_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32:
if (in.IsRegister()) {
__ cvtsi2sd(out.AsFpuRegister<XmmRegister>(), in.AsRegister<CpuRegister>(), false);
} else if (in.IsConstant()) {
int32_t v = in.GetConstant()->AsIntConstant()->GetValue();
XmmRegister dest = out.AsFpuRegister<XmmRegister>();
codegen_->Load64BitValue(dest, static_cast<double>(v));
} else {
__ cvtsi2sd(out.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()), false);
}
break;
case DataType::Type::kInt64:
if (in.IsRegister()) {
__ cvtsi2sd(out.AsFpuRegister<XmmRegister>(), in.AsRegister<CpuRegister>(), true);
} else if (in.IsConstant()) {
int64_t v = in.GetConstant()->AsLongConstant()->GetValue();
XmmRegister dest = out.AsFpuRegister<XmmRegister>();
codegen_->Load64BitValue(dest, static_cast<double>(v));
} else {
__ cvtsi2sd(out.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()), true);
}
break;
case DataType::Type::kFloat32:
if (in.IsFpuRegister()) {
__ cvtss2sd(out.AsFpuRegister<XmmRegister>(), in.AsFpuRegister<XmmRegister>());
} else if (in.IsConstant()) {
float v = in.GetConstant()->AsFloatConstant()->GetValue();
XmmRegister dest = out.AsFpuRegister<XmmRegister>();
codegen_->Load64BitValue(dest, static_cast<double>(v));
} else {
__ cvtss2sd(out.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), in.GetStackIndex()));
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
break;
default:
LOG(FATAL) << "Unexpected type conversion from " << input_type
<< " to " << result_type;
}
}
void LocationsBuilderX86_64::VisitAdd(HAdd* add) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(add, LocationSummary::kNoCall);
switch (add->GetResultType()) {
case DataType::Type::kInt32: {
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::RegisterOrConstant(add->InputAt(1)));
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
break;
}
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RequiresRegister());
// We can use a leaq or addq if the constant can fit in an immediate.
locations->SetInAt(1, Location::RegisterOrInt32Constant(add->InputAt(1)));
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
break;
}
case DataType::Type::kFloat64:
case DataType::Type::kFloat32: {
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::SameAsFirstInput());
break;
}
default:
LOG(FATAL) << "Unexpected add type " << add->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::VisitAdd(HAdd* add) {
LocationSummary* locations = add->GetLocations();
Location first = locations->InAt(0);
Location second = locations->InAt(1);
Location out = locations->Out();
switch (add->GetResultType()) {
case DataType::Type::kInt32: {
if (second.IsRegister()) {
if (out.AsRegister<Register>() == first.AsRegister<Register>()) {
__ addl(out.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else if (out.AsRegister<Register>() == second.AsRegister<Register>()) {
__ addl(out.AsRegister<CpuRegister>(), first.AsRegister<CpuRegister>());
} else {
__ leal(out.AsRegister<CpuRegister>(), Address(
first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>(), TIMES_1, 0));
}
} else if (second.IsConstant()) {
if (out.AsRegister<Register>() == first.AsRegister<Register>()) {
__ addl(out.AsRegister<CpuRegister>(),
Immediate(second.GetConstant()->AsIntConstant()->GetValue()));
} else {
__ leal(out.AsRegister<CpuRegister>(), Address(
first.AsRegister<CpuRegister>(), second.GetConstant()->AsIntConstant()->GetValue()));
}
} else {
DCHECK(first.Equals(locations->Out()));
__ addl(first.AsRegister<CpuRegister>(), Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kInt64: {
if (second.IsRegister()) {
if (out.AsRegister<Register>() == first.AsRegister<Register>()) {
__ addq(out.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else if (out.AsRegister<Register>() == second.AsRegister<Register>()) {
__ addq(out.AsRegister<CpuRegister>(), first.AsRegister<CpuRegister>());
} else {
__ leaq(out.AsRegister<CpuRegister>(), Address(
first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>(), TIMES_1, 0));
}
} else {
DCHECK(second.IsConstant());
int64_t value = second.GetConstant()->AsLongConstant()->GetValue();
int32_t int32_value = Low32Bits(value);
DCHECK_EQ(int32_value, value);
if (out.AsRegister<Register>() == first.AsRegister<Register>()) {
__ addq(out.AsRegister<CpuRegister>(), Immediate(int32_value));
} else {
__ leaq(out.AsRegister<CpuRegister>(), Address(
first.AsRegister<CpuRegister>(), int32_value));
}
}
break;
}
case DataType::Type::kFloat32: {
if (second.IsFpuRegister()) {
__ addss(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ addss(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralFloatAddress(
second.GetConstant()->AsFloatConstant()->GetValue()));
} else {
DCHECK(second.IsStackSlot());
__ addss(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kFloat64: {
if (second.IsFpuRegister()) {
__ addsd(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ addsd(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralDoubleAddress(
second.GetConstant()->AsDoubleConstant()->GetValue()));
} else {
DCHECK(second.IsDoubleStackSlot());
__ addsd(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
default:
LOG(FATAL) << "Unexpected add type " << add->GetResultType();
}
}
void LocationsBuilderX86_64::VisitSub(HSub* sub) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(sub, LocationSummary::kNoCall);
switch (sub->GetResultType()) {
case DataType::Type::kInt32: {
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::SameAsFirstInput());
break;
}
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::RegisterOrInt32Constant(sub->InputAt(1)));
locations->SetOut(Location::SameAsFirstInput());
break;
}
case DataType::Type::kFloat32:
case DataType::Type::kFloat64: {
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::SameAsFirstInput());
break;
}
default:
LOG(FATAL) << "Unexpected sub type " << sub->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::VisitSub(HSub* sub) {
LocationSummary* locations = sub->GetLocations();
Location first = locations->InAt(0);
Location second = locations->InAt(1);
DCHECK(first.Equals(locations->Out()));
switch (sub->GetResultType()) {
case DataType::Type::kInt32: {
if (second.IsRegister()) {
__ subl(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else if (second.IsConstant()) {
Immediate imm(second.GetConstant()->AsIntConstant()->GetValue());
__ subl(first.AsRegister<CpuRegister>(), imm);
} else {
__ subl(first.AsRegister<CpuRegister>(), Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kInt64: {
if (second.IsConstant()) {
int64_t value = second.GetConstant()->AsLongConstant()->GetValue();
DCHECK(IsInt<32>(value));
__ subq(first.AsRegister<CpuRegister>(), Immediate(static_cast<int32_t>(value)));
} else {
__ subq(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
}
break;
}
case DataType::Type::kFloat32: {
if (second.IsFpuRegister()) {
__ subss(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ subss(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralFloatAddress(
second.GetConstant()->AsFloatConstant()->GetValue()));
} else {
DCHECK(second.IsStackSlot());
__ subss(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kFloat64: {
if (second.IsFpuRegister()) {
__ subsd(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ subsd(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralDoubleAddress(
second.GetConstant()->AsDoubleConstant()->GetValue()));
} else {
DCHECK(second.IsDoubleStackSlot());
__ subsd(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
default:
LOG(FATAL) << "Unexpected sub type " << sub->GetResultType();
}
}
void LocationsBuilderX86_64::VisitMul(HMul* mul) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(mul, LocationSummary::kNoCall);
switch (mul->GetResultType()) {
case DataType::Type::kInt32: {
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
if (mul->InputAt(1)->IsIntConstant()) {
// Can use 3 operand multiply.
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
} else {
locations->SetOut(Location::SameAsFirstInput());
}
break;
}
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
if (mul->InputAt(1)->IsLongConstant() &&
IsInt<32>(mul->InputAt(1)->AsLongConstant()->GetValue())) {
// Can use 3 operand multiply.
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
} else {
locations->SetOut(Location::SameAsFirstInput());
}
break;
}
case DataType::Type::kFloat32:
case DataType::Type::kFloat64: {
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::SameAsFirstInput());
break;
}
default:
LOG(FATAL) << "Unexpected mul type " << mul->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::VisitMul(HMul* mul) {
LocationSummary* locations = mul->GetLocations();
Location first = locations->InAt(0);
Location second = locations->InAt(1);
Location out = locations->Out();
switch (mul->GetResultType()) {
case DataType::Type::kInt32:
// The constant may have ended up in a register, so test explicitly to avoid
// problems where the output may not be the same as the first operand.
if (mul->InputAt(1)->IsIntConstant()) {
Immediate imm(mul->InputAt(1)->AsIntConstant()->GetValue());
__ imull(out.AsRegister<CpuRegister>(), first.AsRegister<CpuRegister>(), imm);
} else if (second.IsRegister()) {
DCHECK(first.Equals(out));
__ imull(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else {
DCHECK(first.Equals(out));
DCHECK(second.IsStackSlot());
__ imull(first.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
case DataType::Type::kInt64: {
// The constant may have ended up in a register, so test explicitly to avoid
// problems where the output may not be the same as the first operand.
if (mul->InputAt(1)->IsLongConstant()) {
int64_t value = mul->InputAt(1)->AsLongConstant()->GetValue();
if (IsInt<32>(value)) {
__ imulq(out.AsRegister<CpuRegister>(), first.AsRegister<CpuRegister>(),
Immediate(static_cast<int32_t>(value)));
} else {
// Have to use the constant area.
DCHECK(first.Equals(out));
__ imulq(first.AsRegister<CpuRegister>(), codegen_->LiteralInt64Address(value));
}
} else if (second.IsRegister()) {
DCHECK(first.Equals(out));
__ imulq(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else {
DCHECK(second.IsDoubleStackSlot());
DCHECK(first.Equals(out));
__ imulq(first.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kFloat32: {
DCHECK(first.Equals(out));
if (second.IsFpuRegister()) {
__ mulss(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ mulss(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralFloatAddress(
second.GetConstant()->AsFloatConstant()->GetValue()));
} else {
DCHECK(second.IsStackSlot());
__ mulss(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kFloat64: {
DCHECK(first.Equals(out));
if (second.IsFpuRegister()) {
__ mulsd(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ mulsd(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralDoubleAddress(
second.GetConstant()->AsDoubleConstant()->GetValue()));
} else {
DCHECK(second.IsDoubleStackSlot());
__ mulsd(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
default:
LOG(FATAL) << "Unexpected mul type " << mul->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::PushOntoFPStack(Location source, uint32_t temp_offset,
uint32_t stack_adjustment, bool is_float) {
if (source.IsStackSlot()) {
DCHECK(is_float);
__ flds(Address(CpuRegister(RSP), source.GetStackIndex() + stack_adjustment));
} else if (source.IsDoubleStackSlot()) {
DCHECK(!is_float);
__ fldl(Address(CpuRegister(RSP), source.GetStackIndex() + stack_adjustment));
} else {
// Write the value to the temporary location on the stack and load to FP stack.
if (is_float) {
Location stack_temp = Location::StackSlot(temp_offset);
codegen_->Move(stack_temp, source);
__ flds(Address(CpuRegister(RSP), temp_offset));
} else {
Location stack_temp = Location::DoubleStackSlot(temp_offset);
codegen_->Move(stack_temp, source);
__ fldl(Address(CpuRegister(RSP), temp_offset));
}
}
}
void InstructionCodeGeneratorX86_64::GenerateRemFP(HRem *rem) {
DataType::Type type = rem->GetResultType();
bool is_float = type == DataType::Type::kFloat32;
size_t elem_size = DataType::Size(type);
LocationSummary* locations = rem->GetLocations();
Location first = locations->InAt(0);
Location second = locations->InAt(1);
Location out = locations->Out();
// Create stack space for 2 elements.
// TODO: enhance register allocator to ask for stack temporaries.
__ subq(CpuRegister(RSP), Immediate(2 * elem_size));
// Load the values to the FP stack in reverse order, using temporaries if needed.
PushOntoFPStack(second, elem_size, 2 * elem_size, is_float);
PushOntoFPStack(first, 0, 2 * elem_size, is_float);
// Loop doing FPREM until we stabilize.
NearLabel retry;
__ Bind(&retry);
__ fprem();
// Move FP status to AX.
__ fstsw();
// And see if the argument reduction is complete. This is signaled by the
// C2 FPU flag bit set to 0.
__ andl(CpuRegister(RAX), Immediate(kC2ConditionMask));
__ j(kNotEqual, &retry);
// We have settled on the final value. Retrieve it into an XMM register.
// Store FP top of stack to real stack.
if (is_float) {
__ fsts(Address(CpuRegister(RSP), 0));
} else {
__ fstl(Address(CpuRegister(RSP), 0));
}
// Pop the 2 items from the FP stack.
__ fucompp();
// Load the value from the stack into an XMM register.
DCHECK(out.IsFpuRegister()) << out;
if (is_float) {
__ movss(out.AsFpuRegister<XmmRegister>(), Address(CpuRegister(RSP), 0));
} else {
__ movsd(out.AsFpuRegister<XmmRegister>(), Address(CpuRegister(RSP), 0));
}
// And remove the temporary stack space we allocated.
__ addq(CpuRegister(RSP), Immediate(2 * elem_size));
}
void InstructionCodeGeneratorX86_64::DivRemOneOrMinusOne(HBinaryOperation* instruction) {
DCHECK(instruction->IsDiv() || instruction->IsRem());
LocationSummary* locations = instruction->GetLocations();
Location second = locations->InAt(1);
DCHECK(second.IsConstant());
CpuRegister output_register = locations->Out().AsRegister<CpuRegister>();
CpuRegister input_register = locations->InAt(0).AsRegister<CpuRegister>();
int64_t imm = Int64FromConstant(second.GetConstant());
DCHECK(imm == 1 || imm == -1);
switch (instruction->GetResultType()) {
case DataType::Type::kInt32: {
if (instruction->IsRem()) {
__ xorl(output_register, output_register);
} else {
__ movl(output_register, input_register);
if (imm == -1) {
__ negl(output_register);
}
}
break;
}
case DataType::Type::kInt64: {
if (instruction->IsRem()) {
__ xorl(output_register, output_register);
} else {
__ movq(output_register, input_register);
if (imm == -1) {
__ negq(output_register);
}
}
break;
}
default:
LOG(FATAL) << "Unexpected type for div by (-)1 " << instruction->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::DivByPowerOfTwo(HDiv* instruction) {
LocationSummary* locations = instruction->GetLocations();
Location second = locations->InAt(1);
CpuRegister output_register = locations->Out().AsRegister<CpuRegister>();
CpuRegister numerator = locations->InAt(0).AsRegister<CpuRegister>();
int64_t imm = Int64FromConstant(second.GetConstant());
DCHECK(IsPowerOfTwo(AbsOrMin(imm)));
uint64_t abs_imm = AbsOrMin(imm);
CpuRegister tmp = locations->GetTemp(0).AsRegister<CpuRegister>();
if (instruction->GetResultType() == DataType::Type::kInt32) {
__ leal(tmp, Address(numerator, abs_imm - 1));
__ testl(numerator, numerator);
__ cmov(kGreaterEqual, tmp, numerator);
int shift = CTZ(imm);
__ sarl(tmp, Immediate(shift));
if (imm < 0) {
__ negl(tmp);
}
__ movl(output_register, tmp);
} else {
DCHECK_EQ(instruction->GetResultType(), DataType::Type::kInt64);
CpuRegister rdx = locations->GetTemp(0).AsRegister<CpuRegister>();
codegen_->Load64BitValue(rdx, abs_imm - 1);
__ addq(rdx, numerator);
__ testq(numerator, numerator);
__ cmov(kGreaterEqual, rdx, numerator);
int shift = CTZ(imm);
__ sarq(rdx, Immediate(shift));
if (imm < 0) {
__ negq(rdx);
}
__ movq(output_register, rdx);
}
}
void InstructionCodeGeneratorX86_64::GenerateDivRemWithAnyConstant(HBinaryOperation* instruction) {
DCHECK(instruction->IsDiv() || instruction->IsRem());
LocationSummary* locations = instruction->GetLocations();
Location second = locations->InAt(1);
CpuRegister numerator = instruction->IsDiv() ? locations->GetTemp(1).AsRegister<CpuRegister>()
: locations->GetTemp(0).AsRegister<CpuRegister>();
CpuRegister eax = locations->InAt(0).AsRegister<CpuRegister>();
CpuRegister edx = instruction->IsDiv() ? locations->GetTemp(0).AsRegister<CpuRegister>()
: locations->Out().AsRegister<CpuRegister>();
CpuRegister out = locations->Out().AsRegister<CpuRegister>();
DCHECK_EQ(RAX, eax.AsRegister());
DCHECK_EQ(RDX, edx.AsRegister());
if (instruction->IsDiv()) {
DCHECK_EQ(RAX, out.AsRegister());
} else {
DCHECK_EQ(RDX, out.AsRegister());
}
int64_t magic;
int shift;
// TODO: can these branches be written as one?
if (instruction->GetResultType() == DataType::Type::kInt32) {
int imm = second.GetConstant()->AsIntConstant()->GetValue();
CalculateMagicAndShiftForDivRem(imm, false /* is_long */, &magic, &shift);
__ movl(numerator, eax);
__ movl(eax, Immediate(magic));
__ imull(numerator);
if (imm > 0 && magic < 0) {
__ addl(edx, numerator);
} else if (imm < 0 && magic > 0) {
__ subl(edx, numerator);
}
if (shift != 0) {
__ sarl(edx, Immediate(shift));
}
__ movl(eax, edx);
__ shrl(edx, Immediate(31));
__ addl(edx, eax);
if (instruction->IsRem()) {
__ movl(eax, numerator);
__ imull(edx, Immediate(imm));
__ subl(eax, edx);
__ movl(edx, eax);
} else {
__ movl(eax, edx);
}
} else {
int64_t imm = second.GetConstant()->AsLongConstant()->GetValue();
DCHECK_EQ(instruction->GetResultType(), DataType::Type::kInt64);
CpuRegister rax = eax;
CpuRegister rdx = edx;
CalculateMagicAndShiftForDivRem(imm, true /* is_long */, &magic, &shift);
// Save the numerator.
__ movq(numerator, rax);
// RAX = magic
codegen_->Load64BitValue(rax, magic);
// RDX:RAX = magic * numerator
__ imulq(numerator);
if (imm > 0 && magic < 0) {
// RDX += numerator
__ addq(rdx, numerator);
} else if (imm < 0 && magic > 0) {
// RDX -= numerator
__ subq(rdx, numerator);
}
// Shift if needed.
if (shift != 0) {
__ sarq(rdx, Immediate(shift));
}
// RDX += 1 if RDX < 0
__ movq(rax, rdx);
__ shrq(rdx, Immediate(63));
__ addq(rdx, rax);
if (instruction->IsRem()) {
__ movq(rax, numerator);
if (IsInt<32>(imm)) {
__ imulq(rdx, Immediate(static_cast<int32_t>(imm)));
} else {
__ imulq(rdx, codegen_->LiteralInt64Address(imm));
}
__ subq(rax, rdx);
__ movq(rdx, rax);
} else {
__ movq(rax, rdx);
}
}
}
void InstructionCodeGeneratorX86_64::GenerateDivRemIntegral(HBinaryOperation* instruction) {
DCHECK(instruction->IsDiv() || instruction->IsRem());
DataType::Type type = instruction->GetResultType();
DCHECK(type == DataType::Type::kInt32 || type == DataType::Type::kInt64);
bool is_div = instruction->IsDiv();
LocationSummary* locations = instruction->GetLocations();
CpuRegister out = locations->Out().AsRegister<CpuRegister>();
Location second = locations->InAt(1);
DCHECK_EQ(RAX, locations->InAt(0).AsRegister<CpuRegister>().AsRegister());
DCHECK_EQ(is_div ? RAX : RDX, out.AsRegister());
if (second.IsConstant()) {
int64_t imm = Int64FromConstant(second.GetConstant());
if (imm == 0) {
// Do not generate anything. DivZeroCheck would prevent any code to be executed.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
} else if (instruction->IsDiv() && IsPowerOfTwo(AbsOrMin(imm))) {
DivByPowerOfTwo(instruction->AsDiv());
} else {
DCHECK(imm <= -2 || imm >= 2);
GenerateDivRemWithAnyConstant(instruction);
}
} else {
SlowPathCode* slow_path =
new (codegen_->GetScopedAllocator()) DivRemMinusOneSlowPathX86_64(
instruction, out.AsRegister(), type, is_div);
codegen_->AddSlowPath(slow_path);
CpuRegister second_reg = second.AsRegister<CpuRegister>();
// 0x80000000(00000000)/-1 triggers an arithmetic exception!
// Dividing by -1 is actually negation and -0x800000000(00000000) = 0x80000000(00000000)
// so it's safe to just use negl instead of more complex comparisons.
if (type == DataType::Type::kInt32) {
__ cmpl(second_reg, Immediate(-1));
__ j(kEqual, slow_path->GetEntryLabel());
// edx:eax <- sign-extended of eax
__ cdq();
// eax = quotient, edx = remainder
__ idivl(second_reg);
} else {
__ cmpq(second_reg, Immediate(-1));
__ j(kEqual, slow_path->GetEntryLabel());
// rdx:rax <- sign-extended of rax
__ cqo();
// rax = quotient, rdx = remainder
__ idivq(second_reg);
}
__ Bind(slow_path->GetExitLabel());
}
}
void LocationsBuilderX86_64::VisitDiv(HDiv* div) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(div, LocationSummary::kNoCall);
switch (div->GetResultType()) {
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RegisterLocation(RAX));
locations->SetInAt(1, Location::RegisterOrConstant(div->InputAt(1)));
locations->SetOut(Location::SameAsFirstInput());
// Intel uses edx:eax as the dividend.
locations->AddTemp(Location::RegisterLocation(RDX));
// We need to save the numerator while we tweak rax and rdx. As we are using imul in a way
// which enforces results to be in RAX and RDX, things are simpler if we use RDX also as
// output and request another temp.
if (div->InputAt(1)->IsConstant()) {
locations->AddTemp(Location::RequiresRegister());
}
break;
}
case DataType::Type::kFloat32:
case DataType::Type::kFloat64: {
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::SameAsFirstInput());
break;
}
default:
LOG(FATAL) << "Unexpected div type " << div->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::VisitDiv(HDiv* div) {
LocationSummary* locations = div->GetLocations();
Location first = locations->InAt(0);
Location second = locations->InAt(1);
DCHECK(first.Equals(locations->Out()));
DataType::Type type = div->GetResultType();
switch (type) {
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
GenerateDivRemIntegral(div);
break;
}
case DataType::Type::kFloat32: {
if (second.IsFpuRegister()) {
__ divss(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ divss(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralFloatAddress(
second.GetConstant()->AsFloatConstant()->GetValue()));
} else {
DCHECK(second.IsStackSlot());
__ divss(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
case DataType::Type::kFloat64: {
if (second.IsFpuRegister()) {
__ divsd(first.AsFpuRegister<XmmRegister>(), second.AsFpuRegister<XmmRegister>());
} else if (second.IsConstant()) {
__ divsd(first.AsFpuRegister<XmmRegister>(),
codegen_->LiteralDoubleAddress(
second.GetConstant()->AsDoubleConstant()->GetValue()));
} else {
DCHECK(second.IsDoubleStackSlot());
__ divsd(first.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), second.GetStackIndex()));
}
break;
}
default:
LOG(FATAL) << "Unexpected div type " << div->GetResultType();
}
}
void LocationsBuilderX86_64::VisitRem(HRem* rem) {
DataType::Type type = rem->GetResultType();
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(rem, LocationSummary::kNoCall);
switch (type) {
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RegisterLocation(RAX));
locations->SetInAt(1, Location::RegisterOrConstant(rem->InputAt(1)));
// Intel uses rdx:rax as the dividend and puts the remainder in rdx
locations->SetOut(Location::RegisterLocation(RDX));
// We need to save the numerator while we tweak eax and edx. As we are using imul in a way
// which enforces results to be in RAX and RDX, things are simpler if we use EAX also as
// output and request another temp.
if (rem->InputAt(1)->IsConstant()) {
locations->AddTemp(Location::RequiresRegister());
}
break;
}
case DataType::Type::kFloat32:
case DataType::Type::kFloat64: {
locations->SetInAt(0, Location::Any());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::RequiresFpuRegister());
locations->AddTemp(Location::RegisterLocation(RAX));
break;
}
default:
LOG(FATAL) << "Unexpected rem type " << type;
}
}
void InstructionCodeGeneratorX86_64::VisitRem(HRem* rem) {
DataType::Type type = rem->GetResultType();
switch (type) {
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
GenerateDivRemIntegral(rem);
break;
}
case DataType::Type::kFloat32:
case DataType::Type::kFloat64: {
GenerateRemFP(rem);
break;
}
default:
LOG(FATAL) << "Unexpected rem type " << rem->GetResultType();
}
}
void LocationsBuilderX86_64::VisitDivZeroCheck(HDivZeroCheck* instruction) {
LocationSummary* locations = codegen_->CreateThrowingSlowPathLocations(instruction);
locations->SetInAt(0, Location::Any());
}
void InstructionCodeGeneratorX86_64::VisitDivZeroCheck(HDivZeroCheck* instruction) {
SlowPathCode* slow_path =
new (codegen_->GetScopedAllocator()) DivZeroCheckSlowPathX86_64(instruction);
codegen_->AddSlowPath(slow_path);
LocationSummary* locations = instruction->GetLocations();
Location value = locations->InAt(0);
switch (instruction->GetType()) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8:
case DataType::Type::kUint16:
case DataType::Type::kInt16:
case DataType::Type::kInt32: {
if (value.IsRegister()) {
__ testl(value.AsRegister<CpuRegister>(), value.AsRegister<CpuRegister>());
__ j(kEqual, slow_path->GetEntryLabel());
} else if (value.IsStackSlot()) {
__ cmpl(Address(CpuRegister(RSP), value.GetStackIndex()), Immediate(0));
__ j(kEqual, slow_path->GetEntryLabel());
} else {
DCHECK(value.IsConstant()) << value;
if (value.GetConstant()->AsIntConstant()->GetValue() == 0) {
__ jmp(slow_path->GetEntryLabel());
}
}
break;
}
case DataType::Type::kInt64: {
if (value.IsRegister()) {
__ testq(value.AsRegister<CpuRegister>(), value.AsRegister<CpuRegister>());
__ j(kEqual, slow_path->GetEntryLabel());
} else if (value.IsDoubleStackSlot()) {
__ cmpq(Address(CpuRegister(RSP), value.GetStackIndex()), Immediate(0));
__ j(kEqual, slow_path->GetEntryLabel());
} else {
DCHECK(value.IsConstant()) << value;
if (value.GetConstant()->AsLongConstant()->GetValue() == 0) {
__ jmp(slow_path->GetEntryLabel());
}
}
break;
}
default:
LOG(FATAL) << "Unexpected type for HDivZeroCheck " << instruction->GetType();
}
}
void LocationsBuilderX86_64::HandleShift(HBinaryOperation* op) {
DCHECK(op->IsShl() || op->IsShr() || op->IsUShr());
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(op, LocationSummary::kNoCall);
switch (op->GetResultType()) {
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RequiresRegister());
// The shift count needs to be in CL.
locations->SetInAt(1, Location::ByteRegisterOrConstant(RCX, op->InputAt(1)));
locations->SetOut(Location::SameAsFirstInput());
break;
}
default:
LOG(FATAL) << "Unexpected operation type " << op->GetResultType();
}
}
void InstructionCodeGeneratorX86_64::HandleShift(HBinaryOperation* op) {
DCHECK(op->IsShl() || op->IsShr() || op->IsUShr());
LocationSummary* locations = op->GetLocations();
CpuRegister first_reg = locations->InAt(0).AsRegister<CpuRegister>();
Location second = locations->InAt(1);
switch (op->GetResultType()) {
case DataType::Type::kInt32: {
if (second.IsRegister()) {
CpuRegister second_reg = second.AsRegister<CpuRegister>();
if (op->IsShl()) {
__ shll(first_reg, second_reg);
} else if (op->IsShr()) {
__ sarl(first_reg, second_reg);
} else {
__ shrl(first_reg, second_reg);
}
} else {
Immediate imm(second.GetConstant()->AsIntConstant()->GetValue() & kMaxIntShiftDistance);
if (op->IsShl()) {
__ shll(first_reg, imm);
} else if (op->IsShr()) {
__ sarl(first_reg, imm);
} else {
__ shrl(first_reg, imm);
}
}
break;
}
case DataType::Type::kInt64: {
if (second.IsRegister()) {
CpuRegister second_reg = second.AsRegister<CpuRegister>();
if (op->IsShl()) {
__ shlq(first_reg, second_reg);
} else if (op->IsShr()) {
__ sarq(first_reg, second_reg);
} else {
__ shrq(first_reg, second_reg);
}
} else {
Immediate imm(second.GetConstant()->AsIntConstant()->GetValue() & kMaxLongShiftDistance);
if (op->IsShl()) {
__ shlq(first_reg, imm);
} else if (op->IsShr()) {
__ sarq(first_reg, imm);
} else {
__ shrq(first_reg, imm);
}
}
break;
}
default:
LOG(FATAL) << "Unexpected operation type " << op->GetResultType();
UNREACHABLE();
}
}
void LocationsBuilderX86_64::VisitRor(HRor* ror) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(ror, LocationSummary::kNoCall);
switch (ror->GetResultType()) {
case DataType::Type::kInt32:
case DataType::Type::kInt64: {
locations->SetInAt(0, Location::RequiresRegister());
// The shift count needs to be in CL (unless it is a constant).
locations->SetInAt(1, Location::ByteRegisterOrConstant(RCX, ror->InputAt(1)));
locations->SetOut(Location::SameAsFirstInput());
break;
}
default:
LOG(FATAL) << "Unexpected operation type " << ror->GetResultType();
UNREACHABLE();
}
}
void InstructionCodeGeneratorX86_64::VisitRor(HRor* ror) {
LocationSummary* locations = ror->GetLocations();
CpuRegister first_reg = locations->InAt(0).AsRegister<CpuRegister>();
Location second = locations->InAt(1);
switch (ror->GetResultType()) {
case DataType::Type::kInt32:
if (second.IsRegister()) {
CpuRegister second_reg = second.AsRegister<CpuRegister>();
__ rorl(first_reg, second_reg);
} else {
Immediate imm(second.GetConstant()->AsIntConstant()->GetValue() & kMaxIntShiftDistance);
__ rorl(first_reg, imm);
}
break;
case DataType::Type::kInt64:
if (second.IsRegister()) {
CpuRegister second_reg = second.AsRegister<CpuRegister>();
__ rorq(first_reg, second_reg);
} else {
Immediate imm(second.GetConstant()->AsIntConstant()->GetValue() & kMaxLongShiftDistance);
__ rorq(first_reg, imm);
}
break;
default:
LOG(FATAL) << "Unexpected operation type " << ror->GetResultType();
UNREACHABLE();
}
}
void LocationsBuilderX86_64::VisitShl(HShl* shl) {
HandleShift(shl);
}
void InstructionCodeGeneratorX86_64::VisitShl(HShl* shl) {
HandleShift(shl);
}
void LocationsBuilderX86_64::VisitShr(HShr* shr) {
HandleShift(shr);
}
void InstructionCodeGeneratorX86_64::VisitShr(HShr* shr) {
HandleShift(shr);
}
void LocationsBuilderX86_64::VisitUShr(HUShr* ushr) {
HandleShift(ushr);
}
void InstructionCodeGeneratorX86_64::VisitUShr(HUShr* ushr) {
HandleShift(ushr);
}
void LocationsBuilderX86_64::VisitNewInstance(HNewInstance* instruction) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
instruction, LocationSummary::kCallOnMainOnly);
InvokeRuntimeCallingConvention calling_convention;
if (instruction->IsStringAlloc()) {
locations->AddTemp(Location::RegisterLocation(kMethodRegisterArgument));
} else {
locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
}
locations->SetOut(Location::RegisterLocation(RAX));
}
void InstructionCodeGeneratorX86_64::VisitNewInstance(HNewInstance* instruction) {
// Note: if heap poisoning is enabled, the entry point takes cares
// of poisoning the reference.
if (instruction->IsStringAlloc()) {
// String is allocated through StringFactory. Call NewEmptyString entry point.
CpuRegister temp = instruction->GetLocations()->GetTemp(0).AsRegister<CpuRegister>();
MemberOffset code_offset = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kX86_64PointerSize);
__ gs()->movq(temp, Address::Absolute(QUICK_ENTRY_POINT(pNewEmptyString), /* no_rip */ true));
__ call(Address(temp, code_offset.SizeValue()));
codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
} else {
codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
DCHECK(!codegen_->IsLeafMethod());
}
}
void LocationsBuilderX86_64::VisitNewArray(HNewArray* instruction) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
instruction, LocationSummary::kCallOnMainOnly);
InvokeRuntimeCallingConvention calling_convention;
locations->SetOut(Location::RegisterLocation(RAX));
locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
locations->SetInAt(1, Location::RegisterLocation(calling_convention.GetRegisterAt(1)));
}
void InstructionCodeGeneratorX86_64::VisitNewArray(HNewArray* instruction) {
// Note: if heap poisoning is enabled, the entry point takes cares
// of poisoning the reference.
QuickEntrypointEnum entrypoint =
CodeGenerator::GetArrayAllocationEntrypoint(instruction->GetLoadClass()->GetClass());
codegen_->InvokeRuntime(entrypoint, instruction, instruction->GetDexPc());
CheckEntrypointTypes<kQuickAllocArrayResolved, void*, mirror::Class*, int32_t>();
DCHECK(!codegen_->IsLeafMethod());
}
void LocationsBuilderX86_64::VisitParameterValue(HParameterValue* instruction) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
Location location = parameter_visitor_.GetNextLocation(instruction->GetType());
if (location.IsStackSlot()) {
location = Location::StackSlot(location.GetStackIndex() + codegen_->GetFrameSize());
} else if (location.IsDoubleStackSlot()) {
location = Location::DoubleStackSlot(location.GetStackIndex() + codegen_->GetFrameSize());
}
locations->SetOut(location);
}
void InstructionCodeGeneratorX86_64::VisitParameterValue(
HParameterValue* instruction ATTRIBUTE_UNUSED) {
// Nothing to do, the parameter is already at its location.
}
void LocationsBuilderX86_64::VisitCurrentMethod(HCurrentMethod* instruction) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
locations->SetOut(Location::RegisterLocation(kMethodRegisterArgument));
}
void InstructionCodeGeneratorX86_64::VisitCurrentMethod(
HCurrentMethod* instruction ATTRIBUTE_UNUSED) {
// Nothing to do, the method is already at its location.
}
void LocationsBuilderX86_64::VisitClassTableGet(HClassTableGet* instruction) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::RequiresRegister());
}
void InstructionCodeGeneratorX86_64::VisitClassTableGet(HClassTableGet* instruction) {
LocationSummary* locations = instruction->GetLocations();
if (instruction->GetTableKind() == HClassTableGet::TableKind::kVTable) {
uint32_t method_offset = mirror::Class::EmbeddedVTableEntryOffset(
instruction->GetIndex(), kX86_64PointerSize).SizeValue();
__ movq(locations->Out().AsRegister<CpuRegister>(),
Address(locations->InAt(0).AsRegister<CpuRegister>(), method_offset));
} else {
uint32_t method_offset = static_cast<uint32_t>(ImTable::OffsetOfElement(
instruction->GetIndex(), kX86_64PointerSize));
__ movq(locations->Out().AsRegister<CpuRegister>(),
Address(locations->InAt(0).AsRegister<CpuRegister>(),
mirror::Class::ImtPtrOffset(kX86_64PointerSize).Uint32Value()));
__ movq(locations->Out().AsRegister<CpuRegister>(),
Address(locations->Out().AsRegister<CpuRegister>(), method_offset));
}
}
void LocationsBuilderX86_64::VisitNot(HNot* not_) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(not_, LocationSummary::kNoCall);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::SameAsFirstInput());
}
void InstructionCodeGeneratorX86_64::VisitNot(HNot* not_) {
LocationSummary* locations = not_->GetLocations();
DCHECK_EQ(locations->InAt(0).AsRegister<CpuRegister>().AsRegister(),
locations->Out().AsRegister<CpuRegister>().AsRegister());
Location out = locations->Out();
switch (not_->GetResultType()) {
case DataType::Type::kInt32:
__ notl(out.AsRegister<CpuRegister>());
break;
case DataType::Type::kInt64:
__ notq(out.AsRegister<CpuRegister>());
break;
default:
LOG(FATAL) << "Unimplemented type for not operation " << not_->GetResultType();
}
}
void LocationsBuilderX86_64::VisitBooleanNot(HBooleanNot* bool_not) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(bool_not, LocationSummary::kNoCall);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::SameAsFirstInput());
}
void InstructionCodeGeneratorX86_64::VisitBooleanNot(HBooleanNot* bool_not) {
LocationSummary* locations = bool_not->GetLocations();
DCHECK_EQ(locations->InAt(0).AsRegister<CpuRegister>().AsRegister(),
locations->Out().AsRegister<CpuRegister>().AsRegister());
Location out = locations->Out();
__ xorl(out.AsRegister<CpuRegister>(), Immediate(1));
}
void LocationsBuilderX86_64::VisitPhi(HPhi* instruction) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
for (size_t i = 0, e = locations->GetInputCount(); i < e; ++i) {
locations->SetInAt(i, Location::Any());
}
locations->SetOut(Location::Any());
}
void InstructionCodeGeneratorX86_64::VisitPhi(HPhi* instruction ATTRIBUTE_UNUSED) {
LOG(FATAL) << "Unimplemented";
}
void CodeGeneratorX86_64::GenerateMemoryBarrier(MemBarrierKind kind) {
/*
* According to the JSR-133 Cookbook, for x86-64 only StoreLoad/AnyAny barriers need memory fence.
* All other barriers (LoadAny, AnyStore, StoreStore) are nops due to the x86-64 memory model.
* For those cases, all we need to ensure is that there is a scheduling barrier in place.
*/
switch (kind) {
case MemBarrierKind::kAnyAny: {
MemoryFence();
break;
}
case MemBarrierKind::kAnyStore:
case MemBarrierKind::kLoadAny:
case MemBarrierKind::kStoreStore: {
// nop
break;
}
case MemBarrierKind::kNTStoreStore:
// Non-Temporal Store/Store needs an explicit fence.
MemoryFence(/* non-temporal */ true);
break;
}
}
void LocationsBuilderX86_64::HandleFieldGet(HInstruction* instruction) {
DCHECK(instruction->IsInstanceFieldGet() || instruction->IsStaticFieldGet());
bool object_field_get_with_read_barrier =
kEmitCompilerReadBarrier && (instruction->GetType() == DataType::Type::kReference);
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction,
object_field_get_with_read_barrier
? LocationSummary::kCallOnSlowPath
: LocationSummary::kNoCall);
if (object_field_get_with_read_barrier && kUseBakerReadBarrier) {
locations->SetCustomSlowPathCallerSaves(RegisterSet::Empty()); // No caller-save registers.
}
locations->SetInAt(0, Location::RequiresRegister());
if (DataType::IsFloatingPointType(instruction->GetType())) {
locations->SetOut(Location::RequiresFpuRegister());
} else {
// The output overlaps for an object field get when read barriers
// are enabled: we do not want the move to overwrite the object's
// location, as we need it to emit the read barrier.
locations->SetOut(
Location::RequiresRegister(),
object_field_get_with_read_barrier ? Location::kOutputOverlap : Location::kNoOutputOverlap);
}
}
void InstructionCodeGeneratorX86_64::HandleFieldGet(HInstruction* instruction,
const FieldInfo& field_info) {
DCHECK(instruction->IsInstanceFieldGet() || instruction->IsStaticFieldGet());
LocationSummary* locations = instruction->GetLocations();
Location base_loc = locations->InAt(0);
CpuRegister base = base_loc.AsRegister<CpuRegister>();
Location out = locations->Out();
bool is_volatile = field_info.IsVolatile();
DCHECK_EQ(DataType::Size(field_info.GetFieldType()), DataType::Size(instruction->GetType()));
DataType::Type load_type = instruction->GetType();
uint32_t offset = field_info.GetFieldOffset().Uint32Value();
switch (load_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8: {
__ movzxb(out.AsRegister<CpuRegister>(), Address(base, offset));
break;
}
case DataType::Type::kInt8: {
__ movsxb(out.AsRegister<CpuRegister>(), Address(base, offset));
break;
}
case DataType::Type::kUint16: {
__ movzxw(out.AsRegister<CpuRegister>(), Address(base, offset));
break;
}
case DataType::Type::kInt16: {
__ movsxw(out.AsRegister<CpuRegister>(), Address(base, offset));
break;
}
case DataType::Type::kInt32: {
__ movl(out.AsRegister<CpuRegister>(), Address(base, offset));
break;
}
case DataType::Type::kReference: {
// /* HeapReference<Object> */ out = *(base + offset)
if (kEmitCompilerReadBarrier && kUseBakerReadBarrier) {
// Note that a potential implicit null check is handled in this
// CodeGeneratorX86_64::GenerateFieldLoadWithBakerReadBarrier call.
codegen_->GenerateFieldLoadWithBakerReadBarrier(
instruction, out, base, offset, /* needs_null_check */ true);
if (is_volatile) {
codegen_->GenerateMemoryBarrier(MemBarrierKind::kLoadAny);
}
} else {
__ movl(out.AsRegister<CpuRegister>(), Address(base, offset));
codegen_->MaybeRecordImplicitNullCheck(instruction);
if (is_volatile) {
codegen_->GenerateMemoryBarrier(MemBarrierKind::kLoadAny);
}
// If read barriers are enabled, emit read barriers other than
// Baker's using a slow path (and also unpoison the loaded
// reference, if heap poisoning is enabled).
codegen_->MaybeGenerateReadBarrierSlow(instruction, out, out, base_loc, offset);
}
break;
}
case DataType::Type::kInt64: {
__ movq(out.AsRegister<CpuRegister>(), Address(base, offset));
break;
}
case DataType::Type::kFloat32: {
__ movss(out.AsFpuRegister<XmmRegister>(), Address(base, offset));
break;
}
case DataType::Type::kFloat64: {
__ movsd(out.AsFpuRegister<XmmRegister>(), Address(base, offset));
break;
}
case DataType::Type::kUint32:
case DataType::Type::kUint64:
case DataType::Type::kVoid:
LOG(FATAL) << "Unreachable type " << load_type;
UNREACHABLE();
}
if (load_type == DataType::Type::kReference) {
// Potential implicit null checks, in the case of reference
// fields, are handled in the previous switch statement.
} else {
codegen_->MaybeRecordImplicitNullCheck(instruction);
}
if (is_volatile) {
if (load_type == DataType::Type::kReference) {
// Memory barriers, in the case of references, are also handled
// in the previous switch statement.
} else {
codegen_->GenerateMemoryBarrier(MemBarrierKind::kLoadAny);
}
}
}
void LocationsBuilderX86_64::HandleFieldSet(HInstruction* instruction,
const FieldInfo& field_info) {
DCHECK(instruction->IsInstanceFieldSet() || instruction->IsStaticFieldSet());
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
DataType::Type field_type = field_info.GetFieldType();
bool is_volatile = field_info.IsVolatile();
bool needs_write_barrier =
CodeGenerator::StoreNeedsWriteBarrier(field_type, instruction->InputAt(1));
locations->SetInAt(0, Location::RequiresRegister());
if (DataType::IsFloatingPointType(instruction->InputAt(1)->GetType())) {
if (is_volatile) {
// In order to satisfy the semantics of volatile, this must be a single instruction store.
locations->SetInAt(1, Location::FpuRegisterOrInt32Constant(instruction->InputAt(1)));
} else {
locations->SetInAt(1, Location::FpuRegisterOrConstant(instruction->InputAt(1)));
}
} else {
if (is_volatile) {
// In order to satisfy the semantics of volatile, this must be a single instruction store.
locations->SetInAt(1, Location::RegisterOrInt32Constant(instruction->InputAt(1)));
} else {
locations->SetInAt(1, Location::RegisterOrConstant(instruction->InputAt(1)));
}
}
if (needs_write_barrier) {
// Temporary registers for the write barrier.
locations->AddTemp(Location::RequiresRegister()); // Possibly used for reference poisoning too.
locations->AddTemp(Location::RequiresRegister());
} else if (kPoisonHeapReferences && field_type == DataType::Type::kReference) {
// Temporary register for the reference poisoning.
locations->AddTemp(Location::RequiresRegister());
}
}
void InstructionCodeGeneratorX86_64::HandleFieldSet(HInstruction* instruction,
const FieldInfo& field_info,
bool value_can_be_null) {
DCHECK(instruction->IsInstanceFieldSet() || instruction->IsStaticFieldSet());
LocationSummary* locations = instruction->GetLocations();
CpuRegister base = locations->InAt(0).AsRegister<CpuRegister>();
Location value = locations->InAt(1);
bool is_volatile = field_info.IsVolatile();
DataType::Type field_type = field_info.GetFieldType();
uint32_t offset = field_info.GetFieldOffset().Uint32Value();
if (is_volatile) {
codegen_->GenerateMemoryBarrier(MemBarrierKind::kAnyStore);
}
bool maybe_record_implicit_null_check_done = false;
switch (field_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8: {
if (value.IsConstant()) {
__ movb(Address(base, offset),
Immediate(CodeGenerator::GetInt8ValueOf(value.GetConstant())));
} else {
__ movb(Address(base, offset), value.AsRegister<CpuRegister>());
}
break;
}
case DataType::Type::kUint16:
case DataType::Type::kInt16: {
if (value.IsConstant()) {
__ movw(Address(base, offset),
Immediate(CodeGenerator::GetInt16ValueOf(value.GetConstant())));
} else {
__ movw(Address(base, offset), value.AsRegister<CpuRegister>());
}
break;
}
case DataType::Type::kInt32:
case DataType::Type::kReference: {
if (value.IsConstant()) {
int32_t v = CodeGenerator::GetInt32ValueOf(value.GetConstant());
// `field_type == DataType::Type::kReference` implies `v == 0`.
DCHECK((field_type != DataType::Type::kReference) || (v == 0));
// Note: if heap poisoning is enabled, no need to poison
// (negate) `v` if it is a reference, as it would be null.
__ movl(Address(base, offset), Immediate(v));
} else {
if (kPoisonHeapReferences && field_type == DataType::Type::kReference) {
CpuRegister temp = locations->GetTemp(0).AsRegister<CpuRegister>();
__ movl(temp, value.AsRegister<CpuRegister>());
__ PoisonHeapReference(temp);
__ movl(Address(base, offset), temp);
} else {
__ movl(Address(base, offset), value.AsRegister<CpuRegister>());
}
}
break;
}
case DataType::Type::kInt64: {
if (value.IsConstant()) {
int64_t v = value.GetConstant()->AsLongConstant()->GetValue();
codegen_->MoveInt64ToAddress(Address(base, offset),
Address(base, offset + sizeof(int32_t)),
v,
instruction);
maybe_record_implicit_null_check_done = true;
} else {
__ movq(Address(base, offset), value.AsRegister<CpuRegister>());
}
break;
}
case DataType::Type::kFloat32: {
if (value.IsConstant()) {
int32_t v =
bit_cast<int32_t, float>(value.GetConstant()->AsFloatConstant()->GetValue());
__ movl(Address(base, offset), Immediate(v));
} else {
__ movss(Address(base, offset), value.AsFpuRegister<XmmRegister>());
}
break;
}
case DataType::Type::kFloat64: {
if (value.IsConstant()) {
int64_t v =
bit_cast<int64_t, double>(value.GetConstant()->AsDoubleConstant()->GetValue());
codegen_->MoveInt64ToAddress(Address(base, offset),
Address(base, offset + sizeof(int32_t)),
v,
instruction);
maybe_record_implicit_null_check_done = true;
} else {
__ movsd(Address(base, offset), value.AsFpuRegister<XmmRegister>());
}
break;
}
case DataType::Type::kUint32:
case DataType::Type::kUint64:
case DataType::Type::kVoid:
LOG(FATAL) << "Unreachable type " << field_type;
UNREACHABLE();
}
if (!maybe_record_implicit_null_check_done) {
codegen_->MaybeRecordImplicitNullCheck(instruction);
}
if (CodeGenerator::StoreNeedsWriteBarrier(field_type, instruction->InputAt(1))) {
CpuRegister temp = locations->GetTemp(0).AsRegister<CpuRegister>();
CpuRegister card = locations->GetTemp(1).AsRegister<CpuRegister>();
codegen_->MarkGCCard(temp, card, base, value.AsRegister<CpuRegister>(), value_can_be_null);
}
if (is_volatile) {
codegen_->GenerateMemoryBarrier(MemBarrierKind::kAnyAny);
}
}
void LocationsBuilderX86_64::VisitInstanceFieldSet(HInstanceFieldSet* instruction) {
HandleFieldSet(instruction, instruction->GetFieldInfo());
}
void InstructionCodeGeneratorX86_64::VisitInstanceFieldSet(HInstanceFieldSet* instruction) {
HandleFieldSet(instruction, instruction->GetFieldInfo(), instruction->GetValueCanBeNull());
}
void LocationsBuilderX86_64::VisitInstanceFieldGet(HInstanceFieldGet* instruction) {
HandleFieldGet(instruction);
}
void InstructionCodeGeneratorX86_64::VisitInstanceFieldGet(HInstanceFieldGet* instruction) {
HandleFieldGet(instruction, instruction->GetFieldInfo());
}
void LocationsBuilderX86_64::VisitStaticFieldGet(HStaticFieldGet* instruction) {
HandleFieldGet(instruction);
}
void InstructionCodeGeneratorX86_64::VisitStaticFieldGet(HStaticFieldGet* instruction) {
HandleFieldGet(instruction, instruction->GetFieldInfo());
}
void LocationsBuilderX86_64::VisitStaticFieldSet(HStaticFieldSet* instruction) {
HandleFieldSet(instruction, instruction->GetFieldInfo());
}
void InstructionCodeGeneratorX86_64::VisitStaticFieldSet(HStaticFieldSet* instruction) {
HandleFieldSet(instruction, instruction->GetFieldInfo(), instruction->GetValueCanBeNull());
}
void LocationsBuilderX86_64::VisitUnresolvedInstanceFieldGet(
HUnresolvedInstanceFieldGet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->CreateUnresolvedFieldLocationSummary(
instruction, instruction->GetFieldType(), calling_convention);
}
void InstructionCodeGeneratorX86_64::VisitUnresolvedInstanceFieldGet(
HUnresolvedInstanceFieldGet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->GenerateUnresolvedFieldAccess(instruction,
instruction->GetFieldType(),
instruction->GetFieldIndex(),
instruction->GetDexPc(),
calling_convention);
}
void LocationsBuilderX86_64::VisitUnresolvedInstanceFieldSet(
HUnresolvedInstanceFieldSet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->CreateUnresolvedFieldLocationSummary(
instruction, instruction->GetFieldType(), calling_convention);
}
void InstructionCodeGeneratorX86_64::VisitUnresolvedInstanceFieldSet(
HUnresolvedInstanceFieldSet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->GenerateUnresolvedFieldAccess(instruction,
instruction->GetFieldType(),
instruction->GetFieldIndex(),
instruction->GetDexPc(),
calling_convention);
}
void LocationsBuilderX86_64::VisitUnresolvedStaticFieldGet(
HUnresolvedStaticFieldGet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->CreateUnresolvedFieldLocationSummary(
instruction, instruction->GetFieldType(), calling_convention);
}
void InstructionCodeGeneratorX86_64::VisitUnresolvedStaticFieldGet(
HUnresolvedStaticFieldGet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->GenerateUnresolvedFieldAccess(instruction,
instruction->GetFieldType(),
instruction->GetFieldIndex(),
instruction->GetDexPc(),
calling_convention);
}
void LocationsBuilderX86_64::VisitUnresolvedStaticFieldSet(
HUnresolvedStaticFieldSet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->CreateUnresolvedFieldLocationSummary(
instruction, instruction->GetFieldType(), calling_convention);
}
void InstructionCodeGeneratorX86_64::VisitUnresolvedStaticFieldSet(
HUnresolvedStaticFieldSet* instruction) {
FieldAccessCallingConventionX86_64 calling_convention;
codegen_->GenerateUnresolvedFieldAccess(instruction,
instruction->GetFieldType(),
instruction->GetFieldIndex(),
instruction->GetDexPc(),
calling_convention);
}
void LocationsBuilderX86_64::VisitNullCheck(HNullCheck* instruction) {
LocationSummary* locations = codegen_->CreateThrowingSlowPathLocations(instruction);
Location loc = codegen_->GetCompilerOptions().GetImplicitNullChecks()
? Location::RequiresRegister()
: Location::Any();
locations->SetInAt(0, loc);
}
void CodeGeneratorX86_64::GenerateImplicitNullCheck(HNullCheck* instruction) {
if (CanMoveNullCheckToUser(instruction)) {
return;
}
LocationSummary* locations = instruction->GetLocations();
Location obj = locations->InAt(0);
__ testl(CpuRegister(RAX), Address(obj.AsRegister<CpuRegister>(), 0));
RecordPcInfo(instruction, instruction->GetDexPc());
}
void CodeGeneratorX86_64::GenerateExplicitNullCheck(HNullCheck* instruction) {
SlowPathCode* slow_path = new (GetScopedAllocator()) NullCheckSlowPathX86_64(instruction);
AddSlowPath(slow_path);
LocationSummary* locations = instruction->GetLocations();
Location obj = locations->InAt(0);
if (obj.IsRegister()) {
__ testl(obj.AsRegister<CpuRegister>(), obj.AsRegister<CpuRegister>());
} else if (obj.IsStackSlot()) {
__ cmpl(Address(CpuRegister(RSP), obj.GetStackIndex()), Immediate(0));
} else {
DCHECK(obj.IsConstant()) << obj;
DCHECK(obj.GetConstant()->IsNullConstant());
__ jmp(slow_path->GetEntryLabel());
return;
}
__ j(kEqual, slow_path->GetEntryLabel());
}
void InstructionCodeGeneratorX86_64::VisitNullCheck(HNullCheck* instruction) {
codegen_->GenerateNullCheck(instruction);
}
void LocationsBuilderX86_64::VisitArrayGet(HArrayGet* instruction) {
bool object_array_get_with_read_barrier =
kEmitCompilerReadBarrier && (instruction->GetType() == DataType::Type::kReference);
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction,
object_array_get_with_read_barrier
? LocationSummary::kCallOnSlowPath
: LocationSummary::kNoCall);
if (object_array_get_with_read_barrier && kUseBakerReadBarrier) {
locations->SetCustomSlowPathCallerSaves(RegisterSet::Empty()); // No caller-save registers.
}
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::RegisterOrConstant(instruction->InputAt(1)));
if (DataType::IsFloatingPointType(instruction->GetType())) {
locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
} else {
// The output overlaps for an object array get when read barriers
// are enabled: we do not want the move to overwrite the array's
// location, as we need it to emit the read barrier.
locations->SetOut(
Location::RequiresRegister(),
object_array_get_with_read_barrier ? Location::kOutputOverlap : Location::kNoOutputOverlap);
}
}
void InstructionCodeGeneratorX86_64::VisitArrayGet(HArrayGet* instruction) {
LocationSummary* locations = instruction->GetLocations();
Location obj_loc = locations->InAt(0);
CpuRegister obj = obj_loc.AsRegister<CpuRegister>();
Location index = locations->InAt(1);
Location out_loc = locations->Out();
uint32_t data_offset = CodeGenerator::GetArrayDataOffset(instruction);
DataType::Type type = instruction->GetType();
switch (type) {
case DataType::Type::kBool:
case DataType::Type::kUint8: {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
__ movzxb(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_1, data_offset));
break;
}
case DataType::Type::kInt8: {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
__ movsxb(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_1, data_offset));
break;
}
case DataType::Type::kUint16: {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
if (mirror::kUseStringCompression && instruction->IsStringCharAt()) {
// Branch cases into compressed and uncompressed for each index's type.
uint32_t count_offset = mirror::String::CountOffset().Uint32Value();
NearLabel done, not_compressed;
__ testb(Address(obj, count_offset), Immediate(1));
codegen_->MaybeRecordImplicitNullCheck(instruction);
static_assert(static_cast<uint32_t>(mirror::StringCompressionFlag::kCompressed) == 0u,
"Expecting 0=compressed, 1=uncompressed");
__ j(kNotZero, ¬_compressed);
__ movzxb(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_1, data_offset));
__ jmp(&done);
__ Bind(¬_compressed);
__ movzxw(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_2, data_offset));
__ Bind(&done);
} else {
__ movzxw(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_2, data_offset));
}
break;
}
case DataType::Type::kInt16: {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
__ movsxw(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_2, data_offset));
break;
}
case DataType::Type::kInt32: {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
__ movl(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_4, data_offset));
break;
}
case DataType::Type::kReference: {
static_assert(
sizeof(mirror::HeapReference<mirror::Object>) == sizeof(int32_t),
"art::mirror::HeapReference<art::mirror::Object> and int32_t have different sizes.");
// /* HeapReference<Object> */ out =
// *(obj + data_offset + index * sizeof(HeapReference<Object>))
if (kEmitCompilerReadBarrier && kUseBakerReadBarrier) {
// Note that a potential implicit null check is handled in this
// CodeGeneratorX86_64::GenerateArrayLoadWithBakerReadBarrier call.
codegen_->GenerateArrayLoadWithBakerReadBarrier(
instruction, out_loc, obj, data_offset, index, /* needs_null_check */ true);
} else {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
__ movl(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_4, data_offset));
codegen_->MaybeRecordImplicitNullCheck(instruction);
// If read barriers are enabled, emit read barriers other than
// Baker's using a slow path (and also unpoison the loaded
// reference, if heap poisoning is enabled).
if (index.IsConstant()) {
uint32_t offset =
(index.GetConstant()->AsIntConstant()->GetValue() << TIMES_4) + data_offset;
codegen_->MaybeGenerateReadBarrierSlow(instruction, out_loc, out_loc, obj_loc, offset);
} else {
codegen_->MaybeGenerateReadBarrierSlow(
instruction, out_loc, out_loc, obj_loc, data_offset, index);
}
}
break;
}
case DataType::Type::kInt64: {
CpuRegister out = out_loc.AsRegister<CpuRegister>();
__ movq(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_8, data_offset));
break;
}
case DataType::Type::kFloat32: {
XmmRegister out = out_loc.AsFpuRegister<XmmRegister>();
__ movss(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_4, data_offset));
break;
}
case DataType::Type::kFloat64: {
XmmRegister out = out_loc.AsFpuRegister<XmmRegister>();
__ movsd(out, CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_8, data_offset));
break;
}
case DataType::Type::kUint32:
case DataType::Type::kUint64:
case DataType::Type::kVoid:
LOG(FATAL) << "Unreachable type " << type;
UNREACHABLE();
}
if (type == DataType::Type::kReference) {
// Potential implicit null checks, in the case of reference
// arrays, are handled in the previous switch statement.
} else {
codegen_->MaybeRecordImplicitNullCheck(instruction);
}
}
void LocationsBuilderX86_64::VisitArraySet(HArraySet* instruction) {
DataType::Type value_type = instruction->GetComponentType();
bool needs_write_barrier =
CodeGenerator::StoreNeedsWriteBarrier(value_type, instruction->GetValue());
bool may_need_runtime_call_for_type_check = instruction->NeedsTypeCheck();
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
instruction,
may_need_runtime_call_for_type_check ?
LocationSummary::kCallOnSlowPath :
LocationSummary::kNoCall);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::RegisterOrConstant(instruction->InputAt(1)));
if (DataType::IsFloatingPointType(value_type)) {
locations->SetInAt(2, Location::FpuRegisterOrConstant(instruction->InputAt(2)));
} else {
locations->SetInAt(2, Location::RegisterOrConstant(instruction->InputAt(2)));
}
if (needs_write_barrier) {
// Temporary registers for the write barrier.
locations->AddTemp(Location::RequiresRegister()); // Possibly used for ref. poisoning too.
locations->AddTemp(Location::RequiresRegister());
}
}
void InstructionCodeGeneratorX86_64::VisitArraySet(HArraySet* instruction) {
LocationSummary* locations = instruction->GetLocations();
Location array_loc = locations->InAt(0);
CpuRegister array = array_loc.AsRegister<CpuRegister>();
Location index = locations->InAt(1);
Location value = locations->InAt(2);
DataType::Type value_type = instruction->GetComponentType();
bool may_need_runtime_call_for_type_check = instruction->NeedsTypeCheck();
bool needs_write_barrier =
CodeGenerator::StoreNeedsWriteBarrier(value_type, instruction->GetValue());
uint32_t class_offset = mirror::Object::ClassOffset().Int32Value();
uint32_t super_offset = mirror::Class::SuperClassOffset().Int32Value();
uint32_t component_offset = mirror::Class::ComponentTypeOffset().Int32Value();
switch (value_type) {
case DataType::Type::kBool:
case DataType::Type::kUint8:
case DataType::Type::kInt8: {
uint32_t offset = mirror::Array::DataOffset(sizeof(uint8_t)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_1, offset);
if (value.IsRegister()) {
__ movb(address, value.AsRegister<CpuRegister>());
} else {
__ movb(address, Immediate(CodeGenerator::GetInt8ValueOf(value.GetConstant())));
}
codegen_->MaybeRecordImplicitNullCheck(instruction);
break;
}
case DataType::Type::kUint16:
case DataType::Type::kInt16: {
uint32_t offset = mirror::Array::DataOffset(sizeof(uint16_t)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_2, offset);
if (value.IsRegister()) {
__ movw(address, value.AsRegister<CpuRegister>());
} else {
DCHECK(value.IsConstant()) << value;
__ movw(address, Immediate(CodeGenerator::GetInt16ValueOf(value.GetConstant())));
}
codegen_->MaybeRecordImplicitNullCheck(instruction);
break;
}
case DataType::Type::kReference: {
uint32_t offset = mirror::Array::DataOffset(sizeof(int32_t)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_4, offset);
if (!value.IsRegister()) {
// Just setting null.
DCHECK(instruction->InputAt(2)->IsNullConstant());
DCHECK(value.IsConstant()) << value;
__ movl(address, Immediate(0));
codegen_->MaybeRecordImplicitNullCheck(instruction);
DCHECK(!needs_write_barrier);
DCHECK(!may_need_runtime_call_for_type_check);
break;
}
DCHECK(needs_write_barrier);
CpuRegister register_value = value.AsRegister<CpuRegister>();
// We cannot use a NearLabel for `done`, as its range may be too
// short when Baker read barriers are enabled.
Label done;
NearLabel not_null, do_put;
SlowPathCode* slow_path = nullptr;
Location temp_loc = locations->GetTemp(0);
CpuRegister temp = temp_loc.AsRegister<CpuRegister>();
if (may_need_runtime_call_for_type_check) {
slow_path = new (codegen_->GetScopedAllocator()) ArraySetSlowPathX86_64(instruction);
codegen_->AddSlowPath(slow_path);
if (instruction->GetValueCanBeNull()) {
__ testl(register_value, register_value);
__ j(kNotEqual, ¬_null);
__ movl(address, Immediate(0));
codegen_->MaybeRecordImplicitNullCheck(instruction);
__ jmp(&done);
__ Bind(¬_null);
}
// Note that when Baker read barriers are enabled, the type
// checks are performed without read barriers. This is fine,
// even in the case where a class object is in the from-space
// after the flip, as a comparison involving such a type would
// not produce a false positive; it may of course produce a
// false negative, in which case we would take the ArraySet
// slow path.
// /* HeapReference<Class> */ temp = array->klass_
__ movl(temp, Address(array, class_offset));
codegen_->MaybeRecordImplicitNullCheck(instruction);
__ MaybeUnpoisonHeapReference(temp);
// /* HeapReference<Class> */ temp = temp->component_type_
__ movl(temp, Address(temp, component_offset));
// If heap poisoning is enabled, no need to unpoison `temp`
// nor the object reference in `register_value->klass`, as
// we are comparing two poisoned references.
__ cmpl(temp, Address(register_value, class_offset));
if (instruction->StaticTypeOfArrayIsObjectArray()) {
__ j(kEqual, &do_put);
// If heap poisoning is enabled, the `temp` reference has
// not been unpoisoned yet; unpoison it now.
__ MaybeUnpoisonHeapReference(temp);
// If heap poisoning is enabled, no need to unpoison the
// heap reference loaded below, as it is only used for a
// comparison with null.
__ cmpl(Address(temp, super_offset), Immediate(0));
__ j(kNotEqual, slow_path->GetEntryLabel());
__ Bind(&do_put);
} else {
__ j(kNotEqual, slow_path->GetEntryLabel());
}
}
if (kPoisonHeapReferences) {
__ movl(temp, register_value);
__ PoisonHeapReference(temp);
__ movl(address, temp);
} else {
__ movl(address, register_value);
}
if (!may_need_runtime_call_for_type_check) {
codegen_->MaybeRecordImplicitNullCheck(instruction);
}
CpuRegister card = locations->GetTemp(1).AsRegister<CpuRegister>();
codegen_->MarkGCCard(
temp, card, array, value.AsRegister<CpuRegister>(), instruction->GetValueCanBeNull());
__ Bind(&done);
if (slow_path != nullptr) {
__ Bind(slow_path->GetExitLabel());
}
break;
}
case DataType::Type::kInt32: {
uint32_t offset = mirror::Array::DataOffset(sizeof(int32_t)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_4, offset);
if (value.IsRegister()) {
__ movl(address, value.AsRegister<CpuRegister>());
} else {
DCHECK(value.IsConstant()) << value;
int32_t v = CodeGenerator::GetInt32ValueOf(value.GetConstant());
__ movl(address, Immediate(v));
}
codegen_->MaybeRecordImplicitNullCheck(instruction);
break;
}
case DataType::Type::kInt64: {
uint32_t offset = mirror::Array::DataOffset(sizeof(int64_t)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_8, offset);
if (value.IsRegister()) {
__ movq(address, value.AsRegister<CpuRegister>());
codegen_->MaybeRecordImplicitNullCheck(instruction);
} else {
int64_t v = value.GetConstant()->AsLongConstant()->GetValue();
Address address_high =
CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_8, offset + sizeof(int32_t));
codegen_->MoveInt64ToAddress(address, address_high, v, instruction);
}
break;
}
case DataType::Type::kFloat32: {
uint32_t offset = mirror::Array::DataOffset(sizeof(float)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_4, offset);
if (value.IsFpuRegister()) {
__ movss(address, value.AsFpuRegister<XmmRegister>());
} else {
DCHECK(value.IsConstant());
int32_t v = bit_cast<int32_t, float>(value.GetConstant()->AsFloatConstant()->GetValue());
__ movl(address, Immediate(v));
}
codegen_->MaybeRecordImplicitNullCheck(instruction);
break;
}
case DataType::Type::kFloat64: {
uint32_t offset = mirror::Array::DataOffset(sizeof(double)).Uint32Value();
Address address = CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_8, offset);
if (value.IsFpuRegister()) {
__ movsd(address, value.AsFpuRegister<XmmRegister>());
codegen_->MaybeRecordImplicitNullCheck(instruction);
} else {
int64_t v =
bit_cast<int64_t, double>(value.GetConstant()->AsDoubleConstant()->GetValue());
Address address_high =
CodeGeneratorX86_64::ArrayAddress(array, index, TIMES_8, offset + sizeof(int32_t));
codegen_->MoveInt64ToAddress(address, address_high, v, instruction);
}
break;
}
case DataType::Type::kUint32:
case DataType::Type::kUint64:
case DataType::Type::kVoid:
LOG(FATAL) << "Unreachable type " << instruction->GetType();
UNREACHABLE();
}
}
void LocationsBuilderX86_64::VisitArrayLength(HArrayLength* instruction) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
locations->SetInAt(0, Location::RequiresRegister());
if (!instruction->IsEmittedAtUseSite()) {
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
}
}
void InstructionCodeGeneratorX86_64::VisitArrayLength(HArrayLength* instruction) {
if (instruction->IsEmittedAtUseSite()) {
return;
}
LocationSummary* locations = instruction->GetLocations();
uint32_t offset = CodeGenerator::GetArrayLengthOffset(instruction);
CpuRegister obj = locations->InAt(0).AsRegister<CpuRegister>();
CpuRegister out = locations->Out().AsRegister<CpuRegister>();
__ movl(out, Address(obj, offset));
codegen_->MaybeRecordImplicitNullCheck(instruction);
// Mask out most significant bit in case the array is String's array of char.
if (mirror::kUseStringCompression && instruction->IsStringLength()) {
__ shrl(out, Immediate(1));
}
}
void LocationsBuilderX86_64::VisitBoundsCheck(HBoundsCheck* instruction) {
RegisterSet caller_saves = RegisterSet::Empty();
InvokeRuntimeCallingConvention calling_convention;
caller_saves.Add(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
caller_saves.Add(Location::RegisterLocation(calling_convention.GetRegisterAt(1)));
LocationSummary* locations = codegen_->CreateThrowingSlowPathLocations(instruction, caller_saves);
locations->SetInAt(0, Location::RegisterOrConstant(instruction->InputAt(0)));
HInstruction* length = instruction->InputAt(1);
if (!length->IsEmittedAtUseSite()) {
locations->SetInAt(1, Location::RegisterOrConstant(length));
}
}
void InstructionCodeGeneratorX86_64::VisitBoundsCheck(HBoundsCheck* instruction) {
LocationSummary* locations = instruction->GetLocations();
Location index_loc = locations->InAt(0);
Location length_loc = locations->InAt(1);
SlowPathCode* slow_path =
new (codegen_->GetScopedAllocator()) BoundsCheckSlowPathX86_64(instruction);
if (length_loc.IsConstant()) {
int32_t length = CodeGenerator::GetInt32ValueOf(length_loc.GetConstant());
if (index_loc.IsConstant()) {
// BCE will remove the bounds check if we are guarenteed to pass.
int32_t index = CodeGenerator::GetInt32ValueOf(index_loc.GetConstant());
if (index < 0 || index >= length) {
codegen_->AddSlowPath(slow_path);
__ jmp(slow_path->GetEntryLabel());
} else {
// Some optimization after BCE may have generated this, and we should not
// generate a bounds check if it is a valid range.
}
return;
}
// We have to reverse the jump condition because the length is the constant.
CpuRegister index_reg = index_loc.AsRegister<CpuRegister>();
__ cmpl(index_reg, Immediate(length));
codegen_->AddSlowPath(slow_path);
__ j(kAboveEqual, slow_path->GetEntryLabel());
} else {
HInstruction* array_length = instruction->InputAt(1);
if (array_length->IsEmittedAtUseSite()) {
// Address the length field in the array.
DCHECK(array_length->IsArrayLength());
uint32_t len_offset = CodeGenerator::GetArrayLengthOffset(array_length->AsArrayLength());
Location array_loc = array_length->GetLocations()->InAt(0);
Address array_len(array_loc.AsRegister<CpuRegister>(), len_offset);
if (mirror::kUseStringCompression && instruction->IsStringCharAt()) {
// TODO: if index_loc.IsConstant(), compare twice the index (to compensate for
// the string compression flag) with the in-memory length and avoid the temporary.
CpuRegister length_reg = CpuRegister(TMP);
__ movl(length_reg, array_len);
codegen_->MaybeRecordImplicitNullCheck(array_length);
__ shrl(length_reg, Immediate(1));
codegen_->GenerateIntCompare(length_reg, index_loc);
} else {
// Checking the bound for general case:
// Array of char or String's array when the compression feature off.
if (index_loc.IsConstant()) {
int32_t value = CodeGenerator::GetInt32ValueOf(index_loc.GetConstant());
__ cmpl(array_len, Immediate(value));
} else {
__ cmpl(array_len, index_loc.AsRegister<CpuRegister>());
}
codegen_->MaybeRecordImplicitNullCheck(array_length);
}
} else {
codegen_->GenerateIntCompare(length_loc, index_loc);
}
codegen_->AddSlowPath(slow_path);
__ j(kBelowEqual, slow_path->GetEntryLabel());
}
}
void CodeGeneratorX86_64::MarkGCCard(CpuRegister temp,
CpuRegister card,
CpuRegister object,
CpuRegister value,
bool value_can_be_null) {
NearLabel is_null;
if (value_can_be_null) {
__ testl(value, value);
__ j(kEqual, &is_null);
}
__ gs()->movq(card, Address::Absolute(Thread::CardTableOffset<kX86_64PointerSize>().Int32Value(),
/* no_rip */ true));
__ movq(temp, object);
__ shrq(temp, Immediate(gc::accounting::CardTable::kCardShift));
__ movb(Address(temp, card, TIMES_1, 0), card);
if (value_can_be_null) {
__ Bind(&is_null);
}
}
void LocationsBuilderX86_64::VisitParallelMove(HParallelMove* instruction ATTRIBUTE_UNUSED) {
LOG(FATAL) << "Unimplemented";
}
void InstructionCodeGeneratorX86_64::VisitParallelMove(HParallelMove* instruction) {
if (instruction->GetNext()->IsSuspendCheck() &&
instruction->GetBlock()->GetLoopInformation() != nullptr) {
HSuspendCheck* suspend_check = instruction->GetNext()->AsSuspendCheck();
// The back edge will generate the suspend check.
codegen_->ClearSpillSlotsFromLoopPhisInStackMap(suspend_check, instruction);
}
codegen_->GetMoveResolver()->EmitNativeCode(instruction);
}
void LocationsBuilderX86_64::VisitSuspendCheck(HSuspendCheck* instruction) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
instruction, LocationSummary::kCallOnSlowPath);
// In suspend check slow path, usually there are no caller-save registers at all.
// If SIMD instructions are present, however, we force spilling all live SIMD
// registers in full width (since the runtime only saves/restores lower part).
locations->SetCustomSlowPathCallerSaves(
GetGraph()->HasSIMD() ? RegisterSet::AllFpu() : RegisterSet::Empty());
}
void InstructionCodeGeneratorX86_64::VisitSuspendCheck(HSuspendCheck* instruction) {
HBasicBlock* block = instruction->GetBlock();
if (block->GetLoopInformation() != nullptr) {
DCHECK(block->GetLoopInformation()->GetSuspendCheck() == instruction);
// The back edge will generate the suspend check.
return;
}
if (block->IsEntryBlock() && instruction->GetNext()->IsGoto()) {
// The goto will generate the suspend check.
return;
}
GenerateSuspendCheck(instruction, nullptr);
}
void InstructionCodeGeneratorX86_64::GenerateSuspendCheck(HSuspendCheck* instruction,
HBasicBlock* successor) {
SuspendCheckSlowPathX86_64* slow_path =
down_cast<SuspendCheckSlowPathX86_64*>(instruction->GetSlowPath());
if (slow_path == nullptr) {
slow_path =
new (codegen_->GetScopedAllocator()) SuspendCheckSlowPathX86_64(instruction, successor);
instruction->SetSlowPath(slow_path);
codegen_->AddSlowPath(slow_path);
if (successor != nullptr) {
DCHECK(successor->IsLoopHeader());
}
} else {
DCHECK_EQ(slow_path->GetSuccessor(), successor);
}
__ gs()->cmpw(Address::Absolute(Thread::ThreadFlagsOffset<kX86_64PointerSize>().Int32Value(),
/* no_rip */ true),
Immediate(0));
if (successor == nullptr) {
__ j(kNotEqual, slow_path->GetEntryLabel());
__ Bind(slow_path->GetReturnLabel());
} else {
__ j(kEqual, codegen_->GetLabelOf(successor));
__ jmp(slow_path->GetEntryLabel());
}
}
X86_64Assembler* ParallelMoveResolverX86_64::GetAssembler() const {
return codegen_->GetAssembler();
}
void ParallelMoveResolverX86_64::EmitMove(size_t index) {
MoveOperands* move = moves_[index];
Location source = move->GetSource();
Location destination = move->GetDestination();
if (source.IsRegister()) {
if (destination.IsRegister()) {
__ movq(destination.AsRegister<CpuRegister>(), source.AsRegister<CpuRegister>());
} else if (destination.IsStackSlot()) {
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsRegister<CpuRegister>());
} else {
DCHECK(destination.IsDoubleStackSlot());
__ movq(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsRegister<CpuRegister>());
}
} else if (source.IsStackSlot()) {
if (destination.IsRegister()) {
__ movl(destination.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), source.GetStackIndex()));
} else if (destination.IsFpuRegister()) {
__ movss(destination.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), source.GetStackIndex()));
} else {
DCHECK(destination.IsStackSlot());
__ movl(CpuRegister(TMP), Address(CpuRegister(RSP), source.GetStackIndex()));
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()), CpuRegister(TMP));
}
} else if (source.IsDoubleStackSlot()) {
if (destination.IsRegister()) {
__ movq(destination.AsRegister<CpuRegister>(),
Address(CpuRegister(RSP), source.GetStackIndex()));
} else if (destination.IsFpuRegister()) {
__ movsd(destination.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), source.GetStackIndex()));
} else {
DCHECK(destination.IsDoubleStackSlot()) << destination;
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), source.GetStackIndex()));
__ movq(Address(CpuRegister(RSP), destination.GetStackIndex()), CpuRegister(TMP));
}
} else if (source.IsSIMDStackSlot()) {
if (destination.IsFpuRegister()) {
__ movups(destination.AsFpuRegister<XmmRegister>(),
Address(CpuRegister(RSP), source.GetStackIndex()));
} else {
DCHECK(destination.IsSIMDStackSlot());
size_t high = kX86_64WordSize;
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), source.GetStackIndex()));
__ movq(Address(CpuRegister(RSP), destination.GetStackIndex()), CpuRegister(TMP));
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), source.GetStackIndex() + high));
__ movq(Address(CpuRegister(RSP), destination.GetStackIndex() + high), CpuRegister(TMP));
}
} else if (source.IsConstant()) {
HConstant* constant = source.GetConstant();
if (constant->IsIntConstant() || constant->IsNullConstant()) {
int32_t value = CodeGenerator::GetInt32ValueOf(constant);
if (destination.IsRegister()) {
if (value == 0) {
__ xorl(destination.AsRegister<CpuRegister>(), destination.AsRegister<CpuRegister>());
} else {
__ movl(destination.AsRegister<CpuRegister>(), Immediate(value));
}
} else {
DCHECK(destination.IsStackSlot()) << destination;
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()), Immediate(value));
}
} else if (constant->IsLongConstant()) {
int64_t value = constant->AsLongConstant()->GetValue();
if (destination.IsRegister()) {
codegen_->Load64BitValue(destination.AsRegister<CpuRegister>(), value);
} else {
DCHECK(destination.IsDoubleStackSlot()) << destination;
codegen_->Store64BitValueToStack(destination, value);
}
} else if (constant->IsFloatConstant()) {
float fp_value = constant->AsFloatConstant()->GetValue();
if (destination.IsFpuRegister()) {
XmmRegister dest = destination.AsFpuRegister<XmmRegister>();
codegen_->Load32BitValue(dest, fp_value);
} else {
DCHECK(destination.IsStackSlot()) << destination;
Immediate imm(bit_cast<int32_t, float>(fp_value));
__ movl(Address(CpuRegister(RSP), destination.GetStackIndex()), imm);
}
} else {
DCHECK(constant->IsDoubleConstant()) << constant->DebugName();
double fp_value = constant->AsDoubleConstant()->GetValue();
int64_t value = bit_cast<int64_t, double>(fp_value);
if (destination.IsFpuRegister()) {
XmmRegister dest = destination.AsFpuRegister<XmmRegister>();
codegen_->Load64BitValue(dest, fp_value);
} else {
DCHECK(destination.IsDoubleStackSlot()) << destination;
codegen_->Store64BitValueToStack(destination, value);
}
}
} else if (source.IsFpuRegister()) {
if (destination.IsFpuRegister()) {
__ movaps(destination.AsFpuRegister<XmmRegister>(), source.AsFpuRegister<XmmRegister>());
} else if (destination.IsStackSlot()) {
__ movss(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsFpuRegister<XmmRegister>());
} else if (destination.IsDoubleStackSlot()) {
__ movsd(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsFpuRegister<XmmRegister>());
} else {
DCHECK(destination.IsSIMDStackSlot());
__ movups(Address(CpuRegister(RSP), destination.GetStackIndex()),
source.AsFpuRegister<XmmRegister>());
}
}
}
void ParallelMoveResolverX86_64::Exchange32(CpuRegister reg, int mem) {
__ movl(CpuRegister(TMP), Address(CpuRegister(RSP), mem));
__ movl(Address(CpuRegister(RSP), mem), reg);
__ movl(reg, CpuRegister(TMP));
}
void ParallelMoveResolverX86_64::Exchange64(CpuRegister reg1, CpuRegister reg2) {
__ movq(CpuRegister(TMP), reg1);
__ movq(reg1, reg2);
__ movq(reg2, CpuRegister(TMP));
}
void ParallelMoveResolverX86_64::Exchange64(CpuRegister reg, int mem) {
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), mem));
__ movq(Address(CpuRegister(RSP), mem), reg);
__ movq(reg, CpuRegister(TMP));
}
void ParallelMoveResolverX86_64::Exchange32(XmmRegister reg, int mem) {
__ movl(CpuRegister(TMP), Address(CpuRegister(RSP), mem));
__ movss(Address(CpuRegister(RSP), mem), reg);
__ movd(reg, CpuRegister(TMP));
}
void ParallelMoveResolverX86_64::Exchange64(XmmRegister reg, int mem) {
__ movq(CpuRegister(TMP), Address(CpuRegister(RSP), mem));
__ movsd(Address(CpuRegister(RSP), mem), reg);
__ movd(reg, CpuRegister(TMP));
}
void ParallelMoveResolverX86_64::Exchange128(XmmRegister reg, int mem) {
size_t extra_slot = 2 * kX86_64WordSize;
__ subq(CpuRegister(RSP), Immediate(extra_slot));
__ movups(Address(CpuRegister(RSP), 0), XmmRegister(reg));
ExchangeMemory64(0, mem + extra_slot, 2);
__ movups(XmmRegister(reg), Address(CpuRegister(RSP), 0));
__ addq(CpuRegister(RSP), Immediate(extra_slot));
}
void ParallelMoveResolverX86_64::ExchangeMemory32(int mem1, int mem2) {
ScratchRegisterScope ensure_scratch(
this, TMP, RAX, codegen_->GetNumberOfCoreRegisters());
int stack_offset = ensure_scratch.IsSpilled() ? kX86_64WordSize : 0;
__ movl(CpuRegister(TMP), Address(CpuRegister(RSP), mem1 + stack_offset));
__ movl(CpuRegister(ensure_scratch.GetRegister()),
Address(CpuRegister(RSP), mem2 + stack_offset));
__ movl(Address(CpuRegister(RSP), mem2 + stack_offset), CpuRegister(TMP));
__ movl(Address(CpuRegister(RSP), mem1 + stack_offset),
CpuRegister(ensure_scratch.GetRegister()));
}
void ParallelMoveResolverX86_64::ExchangeMemory64(int mem1, int mem2, int num_of_qwords) {
ScratchRegisterScope ensure_scratch(
this, TMP, RAX, codegen_->GetNumberOfCoreRegisters());
int stack_offset = ensure_scratch.IsSpilled() ? kX86_64WordSize : 0;
// Now that temp registers are available (possibly spilled), exchange blocks of memory.
for (int i = 0; i < num_of_qwords; i++) {
__ movq(CpuRegister(TMP),
Address(CpuRegister(RSP), mem1 + stack_offset));
__ movq(CpuRegister(ensure_scratch.GetRegister()),
Address(CpuRegister(RSP), mem2 + stack_offset));
__ movq(Address(CpuRegister(RSP), mem2 + stack_offset),
CpuRegister(TMP));
__ movq(Address(CpuRegister(RSP), mem1 + stack_offset),
CpuRegister(ensure_scratch.GetRegister()));
stack_offset += kX86_64WordSize;
}
}
void ParallelMoveResolverX86_64::EmitSwap(size_t index) {
MoveOperands* move = moves_[index];
Location source = move->GetSource();
Location destination = move->GetDestination();
if (source.IsRegister() && destination.IsRegister()) {
Exchange64(source.AsRegister<CpuRegister>(), destination.AsRegister<CpuRegister>());
} else if (source.IsRegister() && destination.IsStackSlot()) {
Exchange32(source.AsRegister<CpuRegister>(), destination.GetStackIndex());
} else if (source.IsStackSlot() && destination.IsRegister()) {
Exchange32(destination.AsRegister<CpuRegister>(), source.GetStackIndex());
} else if (source.IsStackSlot() && destination.IsStackSlot()) {
ExchangeMemory32(destination.GetStackIndex(), source.GetStackIndex());
} else if (source.IsRegister() && destination.IsDoubleStackSlot()) {
Exchange64(source.AsRegister<CpuRegister>(), destination.GetStackIndex());
} else if (source.IsDoubleStackSlot() && destination.IsRegister()) {
Exchange64(destination.AsRegister<CpuRegister>(), source.GetStackIndex());
} else if (source.IsDoubleStackSlot() && destination.IsDoubleStackSlot()) {
ExchangeMemory64(destination.GetStackIndex(), source.GetStackIndex(), 1);
} else if (source.IsFpuRegister() && destination.IsFpuRegister()) {
__ movd(CpuRegister(TMP), source.AsFpuRegister<XmmRegister>());
__ movaps(source.AsFpuRegister<XmmRegister>(), destination.AsFpuRegister<XmmRegister>());
__ movd(destination.AsFpuRegister<XmmRegister>(), CpuRegister(TMP));
} else if (source.IsFpuRegister() && destination.IsStackSlot()) {
Exchange32(source.AsFpuRegister<XmmRegister>(), destination.GetStackIndex());
} else if (source.IsStackSlot() && destination.IsFpuRegister()) {
Exchange32(destination.AsFpuRegister<XmmRegister>(), source.GetStackIndex());
} else if (source.IsFpuRegister() && destination.IsDoubleStackSlot()) {
Exchange64(source.AsFpuRegister<XmmRegister>(), destination.GetStackIndex());
} else if (source.IsDoubleStackSlot() && destination.IsFpuRegister()) {
Exchange64(destination.AsFpuRegister<XmmRegister>(), source.GetStackIndex());
} else if (source.IsSIMDStackSlot() && destination.IsSIMDStackSlot()) {
ExchangeMemory64(destination.GetStackIndex(), source.GetStackIndex(), 2);
} else if (source.IsFpuRegister() && destination.IsSIMDStackSlot()) {
Exchange128(source.AsFpuRegister<XmmRegister>(), destination.GetStackIndex());
} else if (destination.IsFpuRegister() && source.IsSIMDStackSlot()) {
Exchange128(destination.AsFpuRegister<XmmRegister>(), source.GetStackIndex());
} else {
LOG(FATAL) << "Unimplemented swap between " << source << " and " << destination;
}
}
void ParallelMoveResolverX86_64::SpillScratch(int reg) {
__ pushq(CpuRegister(reg));
}
void ParallelMoveResolverX86_64::RestoreScratch(int reg) {
__ popq(CpuRegister(reg));
}
void InstructionCodeGeneratorX86_64::GenerateClassInitializationCheck(
SlowPathCode* slow_path, CpuRegister class_reg) {
constexpr size_t status_lsb_position = SubtypeCheckBits::BitStructSizeOf();
const size_t status_byte_offset =
mirror::Class::StatusOffset().SizeValue() + (status_lsb_position / kBitsPerByte);
constexpr uint32_t shifted_initialized_value =
enum_cast<uint32_t>(ClassStatus::kInitialized) << (status_lsb_position % kBitsPerByte);
__ cmpb(Address(class_reg, status_byte_offset), Immediate(shifted_initialized_value));
__ j(kBelow, slow_path->GetEntryLabel());
__ Bind(slow_path->GetExitLabel());
// No need for memory fence, thanks to the x86-64 memory model.
}
HLoadClass::LoadKind CodeGeneratorX86_64::GetSupportedLoadClassKind(
HLoadClass::LoadKind desired_class_load_kind) {
switch (desired_class_load_kind) {
case HLoadClass::LoadKind::kInvalid:
LOG(FATAL) << "UNREACHABLE";
UNREACHABLE();
case HLoadClass::LoadKind::kReferrersClass:
break;
case HLoadClass::LoadKind::kBootImageLinkTimePcRelative:
case HLoadClass::LoadKind::kBootImageClassTable:
case HLoadClass::LoadKind::kBssEntry:
DCHECK(!Runtime::Current()->UseJitCompilation());
break;
case HLoadClass::LoadKind::kJitTableAddress:
DCHECK(Runtime::Current()->UseJitCompilation());
break;
case HLoadClass::LoadKind::kBootImageAddress:
case HLoadClass::LoadKind::kRuntimeCall:
break;
}
return desired_class_load_kind;
}
void LocationsBuilderX86_64::VisitLoadClass(HLoadClass* cls) {
HLoadClass::LoadKind load_kind = cls->GetLoadKind();
if (load_kind == HLoadClass::LoadKind::kRuntimeCall) {
// Custom calling convention: RAX serves as both input and output.
CodeGenerator::CreateLoadClassRuntimeCallLocationSummary(
cls,
Location::RegisterLocation(RAX),
Location::RegisterLocation(RAX));
return;
}
DCHECK(!cls->NeedsAccessCheck());
const bool requires_read_barrier = kEmitCompilerReadBarrier && !cls->IsInBootImage();
LocationSummary::CallKind call_kind = (cls->NeedsEnvironment() || requires_read_barrier)
? LocationSummary::kCallOnSlowPath
: LocationSummary::kNoCall;
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(cls, call_kind);
if (kUseBakerReadBarrier && requires_read_barrier && !cls->NeedsEnvironment()) {
locations->SetCustomSlowPathCallerSaves(RegisterSet::Empty()); // No caller-save registers.
}
if (load_kind == HLoadClass::LoadKind::kReferrersClass) {
locations->SetInAt(0, Location::RequiresRegister());
}
locations->SetOut(Location::RequiresRegister());
if (load_kind == HLoadClass::LoadKind::kBssEntry) {
if (!kUseReadBarrier || kUseBakerReadBarrier) {
// Rely on the type resolution and/or initialization to save everything.
// Custom calling convention: RAX serves as both input and output.
RegisterSet caller_saves = RegisterSet::Empty();
caller_saves.Add(Location::RegisterLocation(RAX));
locations->SetCustomSlowPathCallerSaves(caller_saves);
} else {
// For non-Baker read barrier we have a temp-clobbering call.
}
}
}
Label* CodeGeneratorX86_64::NewJitRootClassPatch(const DexFile& dex_file,
dex::TypeIndex type_index,
Handle<mirror::Class> handle) {
ReserveJitClassRoot(TypeReference(&dex_file, type_index), handle);
// Add a patch entry and return the label.
jit_class_patches_.emplace_back(&dex_file, type_index.index_);
PatchInfo<Label>* info = &jit_class_patches_.back();
return &info->label;
}
// NO_THREAD_SAFETY_ANALYSIS as we manipulate handles whose internal object we know does not
// move.
void InstructionCodeGeneratorX86_64::VisitLoadClass(HLoadClass* cls) NO_THREAD_SAFETY_ANALYSIS {
HLoadClass::LoadKind load_kind = cls->GetLoadKind();
if (load_kind == HLoadClass::LoadKind::kRuntimeCall) {
codegen_->GenerateLoadClassRuntimeCall(cls);
return;
}
DCHECK(!cls->NeedsAccessCheck());
LocationSummary* locations = cls->GetLocations();
Location out_loc = locations->Out();
CpuRegister out = out_loc.AsRegister<CpuRegister>();
const ReadBarrierOption read_barrier_option = cls->IsInBootImage()
? kWithoutReadBarrier
: kCompilerReadBarrierOption;
bool generate_null_check = false;
switch (load_kind) {
case HLoadClass::LoadKind::kReferrersClass: {
DCHECK(!cls->CanCallRuntime());
DCHECK(!cls->MustGenerateClinitCheck());
// /* GcRoot<mirror::Class> */ out = current_method->declaring_class_
CpuRegister current_method = locations->InAt(0).AsRegister<CpuRegister>();
GenerateGcRootFieldLoad(
cls,
out_loc,
Address(current_method, ArtMethod::DeclaringClassOffset().Int32Value()),
/* fixup_label */ nullptr,
read_barrier_option);
break;
}
case HLoadClass::LoadKind::kBootImageLinkTimePcRelative:
DCHECK(codegen_->GetCompilerOptions().IsBootImage());
DCHECK_EQ(read_barrier_option, kWithoutReadBarrier);
__ leal(out, Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset, /* no_rip */ false));
codegen_->RecordBootImageTypePatch(cls);
break;
case HLoadClass::LoadKind::kBootImageAddress: {
DCHECK_EQ(read_barrier_option, kWithoutReadBarrier);
uint32_t address = dchecked_integral_cast<uint32_t>(
reinterpret_cast<uintptr_t>(cls->GetClass().Get()));
DCHECK_NE(address, 0u);
__ movl(out, Immediate(static_cast<int32_t>(address))); // Zero-extended.
break;
}
case HLoadClass::LoadKind::kBootImageClassTable: {
DCHECK(!codegen_->GetCompilerOptions().IsBootImage());
__ movl(out, Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset, /* no_rip */ false));
codegen_->RecordBootImageTypePatch(cls);
// Extract the reference from the slot data, i.e. clear the hash bits.
int32_t masked_hash = ClassTable::TableSlot::MaskHash(
ComputeModifiedUtf8Hash(cls->GetDexFile().StringByTypeIdx(cls->GetTypeIndex())));
if (masked_hash != 0) {
__ subl(out, Immediate(masked_hash));
}
break;
}
case HLoadClass::LoadKind::kBssEntry: {
Address address = Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset,
/* no_rip */ false);
Label* fixup_label = codegen_->NewTypeBssEntryPatch(cls);
// /* GcRoot<mirror::Class> */ out = *address /* PC-relative */
GenerateGcRootFieldLoad(cls, out_loc, address, fixup_label, read_barrier_option);
generate_null_check = true;
break;
}
case HLoadClass::LoadKind::kJitTableAddress: {
Address address = Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset,
/* no_rip */ true);
Label* fixup_label =
codegen_->NewJitRootClassPatch(cls->GetDexFile(), cls->GetTypeIndex(), cls->GetClass());
// /* GcRoot<mirror::Class> */ out = *address
GenerateGcRootFieldLoad(cls, out_loc, address, fixup_label, read_barrier_option);
break;
}
default:
LOG(FATAL) << "Unexpected load kind: " << cls->GetLoadKind();
UNREACHABLE();
}
if (generate_null_check || cls->MustGenerateClinitCheck()) {
DCHECK(cls->CanCallRuntime());
SlowPathCode* slow_path = new (codegen_->GetScopedAllocator()) LoadClassSlowPathX86_64(
cls, cls, cls->GetDexPc(), cls->MustGenerateClinitCheck());
codegen_->AddSlowPath(slow_path);
if (generate_null_check) {
__ testl(out, out);
__ j(kEqual, slow_path->GetEntryLabel());
}
if (cls->MustGenerateClinitCheck()) {
GenerateClassInitializationCheck(slow_path, out);
} else {
__ Bind(slow_path->GetExitLabel());
}
}
}
void LocationsBuilderX86_64::VisitClinitCheck(HClinitCheck* check) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(check, LocationSummary::kCallOnSlowPath);
locations->SetInAt(0, Location::RequiresRegister());
if (check->HasUses()) {
locations->SetOut(Location::SameAsFirstInput());
}
}
void InstructionCodeGeneratorX86_64::VisitClinitCheck(HClinitCheck* check) {
// We assume the class to not be null.
SlowPathCode* slow_path = new (codegen_->GetScopedAllocator()) LoadClassSlowPathX86_64(
check->GetLoadClass(), check, check->GetDexPc(), true);
codegen_->AddSlowPath(slow_path);
GenerateClassInitializationCheck(slow_path,
check->GetLocations()->InAt(0).AsRegister<CpuRegister>());
}
HLoadString::LoadKind CodeGeneratorX86_64::GetSupportedLoadStringKind(
HLoadString::LoadKind desired_string_load_kind) {
switch (desired_string_load_kind) {
case HLoadString::LoadKind::kBootImageLinkTimePcRelative:
case HLoadString::LoadKind::kBootImageInternTable:
case HLoadString::LoadKind::kBssEntry:
DCHECK(!Runtime::Current()->UseJitCompilation());
break;
case HLoadString::LoadKind::kJitTableAddress:
DCHECK(Runtime::Current()->UseJitCompilation());
break;
case HLoadString::LoadKind::kBootImageAddress:
case HLoadString::LoadKind::kRuntimeCall:
break;
}
return desired_string_load_kind;
}
void LocationsBuilderX86_64::VisitLoadString(HLoadString* load) {
LocationSummary::CallKind call_kind = CodeGenerator::GetLoadStringCallKind(load);
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(load, call_kind);
if (load->GetLoadKind() == HLoadString::LoadKind::kRuntimeCall) {
locations->SetOut(Location::RegisterLocation(RAX));
} else {
locations->SetOut(Location::RequiresRegister());
if (load->GetLoadKind() == HLoadString::LoadKind::kBssEntry) {
if (!kUseReadBarrier || kUseBakerReadBarrier) {
// Rely on the pResolveString to save everything.
// Custom calling convention: RAX serves as both input and output.
RegisterSet caller_saves = RegisterSet::Empty();
caller_saves.Add(Location::RegisterLocation(RAX));
locations->SetCustomSlowPathCallerSaves(caller_saves);
} else {
// For non-Baker read barrier we have a temp-clobbering call.
}
}
}
}
Label* CodeGeneratorX86_64::NewJitRootStringPatch(const DexFile& dex_file,
dex::StringIndex string_index,
Handle<mirror::String> handle) {
ReserveJitStringRoot(StringReference(&dex_file, string_index), handle);
// Add a patch entry and return the label.
jit_string_patches_.emplace_back(&dex_file, string_index.index_);
PatchInfo<Label>* info = &jit_string_patches_.back();
return &info->label;
}
// NO_THREAD_SAFETY_ANALYSIS as we manipulate handles whose internal object we know does not
// move.
void InstructionCodeGeneratorX86_64::VisitLoadString(HLoadString* load) NO_THREAD_SAFETY_ANALYSIS {
LocationSummary* locations = load->GetLocations();
Location out_loc = locations->Out();
CpuRegister out = out_loc.AsRegister<CpuRegister>();
switch (load->GetLoadKind()) {
case HLoadString::LoadKind::kBootImageLinkTimePcRelative: {
DCHECK(codegen_->GetCompilerOptions().IsBootImage());
__ leal(out, Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset, /* no_rip */ false));
codegen_->RecordBootImageStringPatch(load);
return;
}
case HLoadString::LoadKind::kBootImageAddress: {
uint32_t address = dchecked_integral_cast<uint32_t>(
reinterpret_cast<uintptr_t>(load->GetString().Get()));
DCHECK_NE(address, 0u);
__ movl(out, Immediate(static_cast<int32_t>(address))); // Zero-extended.
return;
}
case HLoadString::LoadKind::kBootImageInternTable: {
DCHECK(!codegen_->GetCompilerOptions().IsBootImage());
__ movl(out, Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset, /* no_rip */ false));
codegen_->RecordBootImageStringPatch(load);
return;
}
case HLoadString::LoadKind::kBssEntry: {
Address address = Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset,
/* no_rip */ false);
Label* fixup_label = codegen_->NewStringBssEntryPatch(load);
// /* GcRoot<mirror::Class> */ out = *address /* PC-relative */
GenerateGcRootFieldLoad(load, out_loc, address, fixup_label, kCompilerReadBarrierOption);
SlowPathCode* slow_path = new (codegen_->GetScopedAllocator()) LoadStringSlowPathX86_64(load);
codegen_->AddSlowPath(slow_path);
__ testl(out, out);
__ j(kEqual, slow_path->GetEntryLabel());
__ Bind(slow_path->GetExitLabel());
return;
}
case HLoadString::LoadKind::kJitTableAddress: {
Address address = Address::Absolute(CodeGeneratorX86_64::kDummy32BitOffset,
/* no_rip */ true);
Label* fixup_label = codegen_->NewJitRootStringPatch(
load->GetDexFile(), load->GetStringIndex(), load->GetString());
// /* GcRoot<mirror::String> */ out = *address
GenerateGcRootFieldLoad(load, out_loc, address, fixup_label, kCompilerReadBarrierOption);
return;
}
default:
break;
}
// TODO: Re-add the compiler code to do string dex cache lookup again.
// Custom calling convention: RAX serves as both input and output.
__ movl(CpuRegister(RAX), Immediate(load->GetStringIndex().index_));
codegen_->InvokeRuntime(kQuickResolveString,
load,
load->GetDexPc());
CheckEntrypointTypes<kQuickResolveString, void*, uint32_t>();
}
static Address GetExceptionTlsAddress() {
return Address::Absolute(Thread::ExceptionOffset<kX86_64PointerSize>().Int32Value(),
/* no_rip */ true);
}
void LocationsBuilderX86_64::VisitLoadException(HLoadException* load) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(load, LocationSummary::kNoCall);
locations->SetOut(Location::RequiresRegister());
}
void InstructionCodeGeneratorX86_64::VisitLoadException(HLoadException* load) {
__ gs()->movl(load->GetLocations()->Out().AsRegister<CpuRegister>(), GetExceptionTlsAddress());
}
void LocationsBuilderX86_64::VisitClearException(HClearException* clear) {
new (GetGraph()->GetAllocator()) LocationSummary(clear, LocationSummary::kNoCall);
}
void InstructionCodeGeneratorX86_64::VisitClearException(HClearException* clear ATTRIBUTE_UNUSED) {
__ gs()->movl(GetExceptionTlsAddress(), Immediate(0));
}
void LocationsBuilderX86_64::VisitThrow(HThrow* instruction) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
instruction, LocationSummary::kCallOnMainOnly);
InvokeRuntimeCallingConvention calling_convention;
locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
}
void InstructionCodeGeneratorX86_64::VisitThrow(HThrow* instruction) {
codegen_->InvokeRuntime(kQuickDeliverException, instruction, instruction->GetDexPc());
CheckEntrypointTypes<kQuickDeliverException, void, mirror::Object*>();
}
static bool CheckCastTypeCheckNeedsATemporary(TypeCheckKind type_check_kind) {
if (type_check_kind == TypeCheckKind::kInterfaceCheck) {
// We need a temporary for holding the iftable length.
return true;
}
return kEmitCompilerReadBarrier &&
!kUseBakerReadBarrier &&
(type_check_kind == TypeCheckKind::kAbstractClassCheck ||
type_check_kind == TypeCheckKind::kClassHierarchyCheck ||
type_check_kind == TypeCheckKind::kArrayObjectCheck);
}
static bool InstanceOfTypeCheckNeedsATemporary(TypeCheckKind type_check_kind) {
return kEmitCompilerReadBarrier &&
!kUseBakerReadBarrier &&
(type_check_kind == TypeCheckKind::kAbstractClassCheck ||
type_check_kind == TypeCheckKind::kClassHierarchyCheck ||
type_check_kind == TypeCheckKind::kArrayObjectCheck);
}
void LocationsBuilderX86_64::VisitInstanceOf(HInstanceOf* instruction) {
LocationSummary::CallKind call_kind = LocationSummary::kNoCall;
TypeCheckKind type_check_kind = instruction->GetTypeCheckKind();
bool baker_read_barrier_slow_path = false;
switch (type_check_kind) {
case TypeCheckKind::kExactCheck:
case TypeCheckKind::kAbstractClassCheck:
case TypeCheckKind::kClassHierarchyCheck:
case TypeCheckKind::kArrayObjectCheck: {
bool needs_read_barrier = CodeGenerator::InstanceOfNeedsReadBarrier(instruction);
call_kind = needs_read_barrier ? LocationSummary::kCallOnSlowPath : LocationSummary::kNoCall;
baker_read_barrier_slow_path = kUseBakerReadBarrier && needs_read_barrier;
break;
}
case TypeCheckKind::kArrayCheck:
case TypeCheckKind::kUnresolvedCheck:
case TypeCheckKind::kInterfaceCheck:
call_kind = LocationSummary::kCallOnSlowPath;
break;
}
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, call_kind);
if (baker_read_barrier_slow_path) {
locations->SetCustomSlowPathCallerSaves(RegisterSet::Empty()); // No caller-save registers.
}
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
// Note that TypeCheckSlowPathX86_64 uses this "out" register too.
locations->SetOut(Location::RequiresRegister());
// When read barriers are enabled, we need a temporary register for
// some cases.
if (InstanceOfTypeCheckNeedsATemporary(type_check_kind)) {
locations->AddTemp(Location::RequiresRegister());
}
}
void InstructionCodeGeneratorX86_64::VisitInstanceOf(HInstanceOf* instruction) {
TypeCheckKind type_check_kind = instruction->GetTypeCheckKind();
LocationSummary* locations = instruction->GetLocations();
Location obj_loc = locations->InAt(0);
CpuRegister obj = obj_loc.AsRegister<CpuRegister>();
Location cls = locations->InAt(1);
Location out_loc = locations->Out();
CpuRegister out = out_loc.AsRegister<CpuRegister>();
Location maybe_temp_loc = InstanceOfTypeCheckNeedsATemporary(type_check_kind) ?
locations->GetTemp(0) :
Location::NoLocation();
uint32_t class_offset = mirror::Object::ClassOffset().Int32Value();
uint32_t super_offset = mirror::Class::SuperClassOffset().Int32Value();
uint32_t component_offset = mirror::Class::ComponentTypeOffset().Int32Value();
uint32_t primitive_offset = mirror::Class::PrimitiveTypeOffset().Int32Value();
SlowPathCode* slow_path = nullptr;
NearLabel done, zero;
// Return 0 if `obj` is null.
// Avoid null check if we know obj is not null.
if (instruction->MustDoNullCheck()) {
__ testl(obj, obj);
__ j(kEqual, &zero);
}
switch (type_check_kind) {
case TypeCheckKind::kExactCheck: {
ReadBarrierOption read_barrier_option =
CodeGenerator::ReadBarrierOptionForInstanceOf(instruction);
// /* HeapReference<Class> */ out = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
out_loc,
obj_loc,
class_offset,
read_barrier_option);
if (cls.IsRegister()) {
__ cmpl(out, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(out, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
if (zero.IsLinked()) {
// Classes must be equal for the instanceof to succeed.
__ j(kNotEqual, &zero);
__ movl(out, Immediate(1));
__ jmp(&done);
} else {
__ setcc(kEqual, out);
// setcc only sets the low byte.
__ andl(out, Immediate(1));
}
break;
}
case TypeCheckKind::kAbstractClassCheck: {
ReadBarrierOption read_barrier_option =
CodeGenerator::ReadBarrierOptionForInstanceOf(instruction);
// /* HeapReference<Class> */ out = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
out_loc,
obj_loc,
class_offset,
read_barrier_option);
// If the class is abstract, we eagerly fetch the super class of the
// object to avoid doing a comparison we know will fail.
NearLabel loop, success;
__ Bind(&loop);
// /* HeapReference<Class> */ out = out->super_class_
GenerateReferenceLoadOneRegister(instruction,
out_loc,
super_offset,
maybe_temp_loc,
read_barrier_option);
__ testl(out, out);
// If `out` is null, we use it for the result, and jump to `done`.
__ j(kEqual, &done);
if (cls.IsRegister()) {
__ cmpl(out, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(out, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
__ j(kNotEqual, &loop);
__ movl(out, Immediate(1));
if (zero.IsLinked()) {
__ jmp(&done);
}
break;
}
case TypeCheckKind::kClassHierarchyCheck: {
ReadBarrierOption read_barrier_option =
CodeGenerator::ReadBarrierOptionForInstanceOf(instruction);
// /* HeapReference<Class> */ out = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
out_loc,
obj_loc,
class_offset,
read_barrier_option);
// Walk over the class hierarchy to find a match.
NearLabel loop, success;
__ Bind(&loop);
if (cls.IsRegister()) {
__ cmpl(out, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(out, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
__ j(kEqual, &success);
// /* HeapReference<Class> */ out = out->super_class_
GenerateReferenceLoadOneRegister(instruction,
out_loc,
super_offset,
maybe_temp_loc,
read_barrier_option);
__ testl(out, out);
__ j(kNotEqual, &loop);
// If `out` is null, we use it for the result, and jump to `done`.
__ jmp(&done);
__ Bind(&success);
__ movl(out, Immediate(1));
if (zero.IsLinked()) {
__ jmp(&done);
}
break;
}
case TypeCheckKind::kArrayObjectCheck: {
ReadBarrierOption read_barrier_option =
CodeGenerator::ReadBarrierOptionForInstanceOf(instruction);
// /* HeapReference<Class> */ out = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
out_loc,
obj_loc,
class_offset,
read_barrier_option);
// Do an exact check.
NearLabel exact_check;
if (cls.IsRegister()) {
__ cmpl(out, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(out, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
__ j(kEqual, &exact_check);
// Otherwise, we need to check that the object's class is a non-primitive array.
// /* HeapReference<Class> */ out = out->component_type_
GenerateReferenceLoadOneRegister(instruction,
out_loc,
component_offset,
maybe_temp_loc,
read_barrier_option);
__ testl(out, out);
// If `out` is null, we use it for the result, and jump to `done`.
__ j(kEqual, &done);
__ cmpw(Address(out, primitive_offset), Immediate(Primitive::kPrimNot));
__ j(kNotEqual, &zero);
__ Bind(&exact_check);
__ movl(out, Immediate(1));
__ jmp(&done);
break;
}
case TypeCheckKind::kArrayCheck: {
// No read barrier since the slow path will retry upon failure.
// /* HeapReference<Class> */ out = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
out_loc,
obj_loc,
class_offset,
kWithoutReadBarrier);
if (cls.IsRegister()) {
__ cmpl(out, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(out, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
DCHECK(locations->OnlyCallsOnSlowPath());
slow_path = new (codegen_->GetScopedAllocator()) TypeCheckSlowPathX86_64(
instruction, /* is_fatal */ false);
codegen_->AddSlowPath(slow_path);
__ j(kNotEqual, slow_path->GetEntryLabel());
__ movl(out, Immediate(1));
if (zero.IsLinked()) {
__ jmp(&done);
}
break;
}
case TypeCheckKind::kUnresolvedCheck:
case TypeCheckKind::kInterfaceCheck: {
// Note that we indeed only call on slow path, but we always go
// into the slow path for the unresolved and interface check
// cases.
//
// We cannot directly call the InstanceofNonTrivial runtime
// entry point without resorting to a type checking slow path
// here (i.e. by calling InvokeRuntime directly), as it would
// require to assign fixed registers for the inputs of this
// HInstanceOf instruction (following the runtime calling
// convention), which might be cluttered by the potential first
// read barrier emission at the beginning of this method.
//
// TODO: Introduce a new runtime entry point taking the object
// to test (instead of its class) as argument, and let it deal
// with the read barrier issues. This will let us refactor this
// case of the `switch` code as it was previously (with a direct
// call to the runtime not using a type checking slow path).
// This should also be beneficial for the other cases above.
DCHECK(locations->OnlyCallsOnSlowPath());
slow_path = new (codegen_->GetScopedAllocator()) TypeCheckSlowPathX86_64(
instruction, /* is_fatal */ false);
codegen_->AddSlowPath(slow_path);
__ jmp(slow_path->GetEntryLabel());
if (zero.IsLinked()) {
__ jmp(&done);
}
break;
}
}
if (zero.IsLinked()) {
__ Bind(&zero);
__ xorl(out, out);
}
if (done.IsLinked()) {
__ Bind(&done);
}
if (slow_path != nullptr) {
__ Bind(slow_path->GetExitLabel());
}
}
void LocationsBuilderX86_64::VisitCheckCast(HCheckCast* instruction) {
TypeCheckKind type_check_kind = instruction->GetTypeCheckKind();
LocationSummary::CallKind call_kind = CodeGenerator::GetCheckCastCallKind(instruction);
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, call_kind);
locations->SetInAt(0, Location::RequiresRegister());
if (type_check_kind == TypeCheckKind::kInterfaceCheck) {
// Require a register for the interface check since there is a loop that compares the class to
// a memory address.
locations->SetInAt(1, Location::RequiresRegister());
} else {
locations->SetInAt(1, Location::Any());
}
// Note that TypeCheckSlowPathX86_64 uses this "temp" register too.
locations->AddTemp(Location::RequiresRegister());
// When read barriers are enabled, we need an additional temporary
// register for some cases.
if (CheckCastTypeCheckNeedsATemporary(type_check_kind)) {
locations->AddTemp(Location::RequiresRegister());
}
}
void InstructionCodeGeneratorX86_64::VisitCheckCast(HCheckCast* instruction) {
TypeCheckKind type_check_kind = instruction->GetTypeCheckKind();
LocationSummary* locations = instruction->GetLocations();
Location obj_loc = locations->InAt(0);
CpuRegister obj = obj_loc.AsRegister<CpuRegister>();
Location cls = locations->InAt(1);
Location temp_loc = locations->GetTemp(0);
CpuRegister temp = temp_loc.AsRegister<CpuRegister>();
Location maybe_temp2_loc = CheckCastTypeCheckNeedsATemporary(type_check_kind) ?
locations->GetTemp(1) :
Location::NoLocation();
const uint32_t class_offset = mirror::Object::ClassOffset().Int32Value();
const uint32_t super_offset = mirror::Class::SuperClassOffset().Int32Value();
const uint32_t component_offset = mirror::Class::ComponentTypeOffset().Int32Value();
const uint32_t primitive_offset = mirror::Class::PrimitiveTypeOffset().Int32Value();
const uint32_t iftable_offset = mirror::Class::IfTableOffset().Uint32Value();
const uint32_t array_length_offset = mirror::Array::LengthOffset().Uint32Value();
const uint32_t object_array_data_offset =
mirror::Array::DataOffset(kHeapReferenceSize).Uint32Value();
bool is_type_check_slow_path_fatal = CodeGenerator::IsTypeCheckSlowPathFatal(instruction);
SlowPathCode* type_check_slow_path =
new (codegen_->GetScopedAllocator()) TypeCheckSlowPathX86_64(
instruction, is_type_check_slow_path_fatal);
codegen_->AddSlowPath(type_check_slow_path);
NearLabel done;
// Avoid null check if we know obj is not null.
if (instruction->MustDoNullCheck()) {
__ testl(obj, obj);
__ j(kEqual, &done);
}
switch (type_check_kind) {
case TypeCheckKind::kExactCheck:
case TypeCheckKind::kArrayCheck: {
// /* HeapReference<Class> */ temp = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
temp_loc,
obj_loc,
class_offset,
kWithoutReadBarrier);
if (cls.IsRegister()) {
__ cmpl(temp, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(temp, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
// Jump to slow path for throwing the exception or doing a
// more involved array check.
__ j(kNotEqual, type_check_slow_path->GetEntryLabel());
break;
}
case TypeCheckKind::kAbstractClassCheck: {
// /* HeapReference<Class> */ temp = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
temp_loc,
obj_loc,
class_offset,
kWithoutReadBarrier);
// If the class is abstract, we eagerly fetch the super class of the
// object to avoid doing a comparison we know will fail.
NearLabel loop;
__ Bind(&loop);
// /* HeapReference<Class> */ temp = temp->super_class_
GenerateReferenceLoadOneRegister(instruction,
temp_loc,
super_offset,
maybe_temp2_loc,
kWithoutReadBarrier);
// If the class reference currently in `temp` is null, jump to the slow path to throw the
// exception.
__ testl(temp, temp);
// Otherwise, compare the classes.
__ j(kZero, type_check_slow_path->GetEntryLabel());
if (cls.IsRegister()) {
__ cmpl(temp, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(temp, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
__ j(kNotEqual, &loop);
break;
}
case TypeCheckKind::kClassHierarchyCheck: {
// /* HeapReference<Class> */ temp = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
temp_loc,
obj_loc,
class_offset,
kWithoutReadBarrier);
// Walk over the class hierarchy to find a match.
NearLabel loop;
__ Bind(&loop);
if (cls.IsRegister()) {
__ cmpl(temp, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(temp, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
__ j(kEqual, &done);
// /* HeapReference<Class> */ temp = temp->super_class_
GenerateReferenceLoadOneRegister(instruction,
temp_loc,
super_offset,
maybe_temp2_loc,
kWithoutReadBarrier);
// If the class reference currently in `temp` is not null, jump
// back at the beginning of the loop.
__ testl(temp, temp);
__ j(kNotZero, &loop);
// Otherwise, jump to the slow path to throw the exception.
__ jmp(type_check_slow_path->GetEntryLabel());
break;
}
case TypeCheckKind::kArrayObjectCheck: {
// /* HeapReference<Class> */ temp = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
temp_loc,
obj_loc,
class_offset,
kWithoutReadBarrier);
// Do an exact check.
NearLabel check_non_primitive_component_type;
if (cls.IsRegister()) {
__ cmpl(temp, cls.AsRegister<CpuRegister>());
} else {
DCHECK(cls.IsStackSlot()) << cls;
__ cmpl(temp, Address(CpuRegister(RSP), cls.GetStackIndex()));
}
__ j(kEqual, &done);
// Otherwise, we need to check that the object's class is a non-primitive array.
// /* HeapReference<Class> */ temp = temp->component_type_
GenerateReferenceLoadOneRegister(instruction,
temp_loc,
component_offset,
maybe_temp2_loc,
kWithoutReadBarrier);
// If the component type is not null (i.e. the object is indeed
// an array), jump to label `check_non_primitive_component_type`
// to further check that this component type is not a primitive
// type.
__ testl(temp, temp);
// Otherwise, jump to the slow path to throw the exception.
__ j(kZero, type_check_slow_path->GetEntryLabel());
__ cmpw(Address(temp, primitive_offset), Immediate(Primitive::kPrimNot));
__ j(kNotEqual, type_check_slow_path->GetEntryLabel());
break;
}
case TypeCheckKind::kUnresolvedCheck: {
// We always go into the type check slow path for the unresolved case.
//
// We cannot directly call the CheckCast runtime entry point
// without resorting to a type checking slow path here (i.e. by
// calling InvokeRuntime directly), as it would require to
// assign fixed registers for the inputs of this HInstanceOf
// instruction (following the runtime calling convention), which
// might be cluttered by the potential first read barrier
// emission at the beginning of this method.
__ jmp(type_check_slow_path->GetEntryLabel());
break;
}
case TypeCheckKind::kInterfaceCheck:
// Fast path for the interface check. Try to avoid read barriers to improve the fast path.
// We can not get false positives by doing this.
// /* HeapReference<Class> */ temp = obj->klass_
GenerateReferenceLoadTwoRegisters(instruction,
temp_loc,
obj_loc,
class_offset,
kWithoutReadBarrier);
// /* HeapReference<Class> */ temp = temp->iftable_
GenerateReferenceLoadTwoRegisters(instruction,
temp_loc,
temp_loc,
iftable_offset,
kWithoutReadBarrier);
// Iftable is never null.
__ movl(maybe_temp2_loc.AsRegister<CpuRegister>(), Address(temp, array_length_offset));
// Maybe poison the `cls` for direct comparison with memory.
__ MaybePoisonHeapReference(cls.AsRegister<CpuRegister>());
// Loop through the iftable and check if any class matches.
NearLabel start_loop;
__ Bind(&start_loop);
// Need to subtract first to handle the empty array case.
__ subl(maybe_temp2_loc.AsRegister<CpuRegister>(), Immediate(2));
__ j(kNegative, type_check_slow_path->GetEntryLabel());
// Go to next interface if the classes do not match.
__ cmpl(cls.AsRegister<CpuRegister>(),
CodeGeneratorX86_64::ArrayAddress(temp,
maybe_temp2_loc,
TIMES_4,
object_array_data_offset));
__ j(kNotEqual, &start_loop); // Return if same class.
// If `cls` was poisoned above, unpoison it.
__ MaybeUnpoisonHeapReference(cls.AsRegister<CpuRegister>());
break;
}
if (done.IsLinked()) {
__ Bind(&done);
}
__ Bind(type_check_slow_path->GetExitLabel());
}
void LocationsBuilderX86_64::VisitMonitorOperation(HMonitorOperation* instruction) {
LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
instruction, LocationSummary::kCallOnMainOnly);
InvokeRuntimeCallingConvention calling_convention;
locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
}
void InstructionCodeGeneratorX86_64::VisitMonitorOperation(HMonitorOperation* instruction) {
codegen_->InvokeRuntime(instruction->IsEnter() ? kQuickLockObject : kQuickUnlockObject,
instruction,
instruction->GetDexPc());
if (instruction->IsEnter()) {
CheckEntrypointTypes<kQuickLockObject, void, mirror::Object*>();
} else {
CheckEntrypointTypes<kQuickUnlockObject, void, mirror::Object*>();
}
}
void LocationsBuilderX86_64::VisitAnd(HAnd* instruction) { HandleBitwiseOperation(instruction); }
void LocationsBuilderX86_64::VisitOr(HOr* instruction) { HandleBitwiseOperation(instruction); }
void LocationsBuilderX86_64::VisitXor(HXor* instruction) { HandleBitwiseOperation(instruction); }
void LocationsBuilderX86_64::HandleBitwiseOperation(HBinaryOperation* instruction) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(instruction, LocationSummary::kNoCall);
DCHECK(instruction->GetResultType() == DataType::Type::kInt32
|| instruction->GetResultType() == DataType::Type::kInt64);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::Any());
locations->SetOut(Location::SameAsFirstInput());
}
void InstructionCodeGeneratorX86_64::VisitAnd(HAnd* instruction) {
HandleBitwiseOperation(instruction);
}
void InstructionCodeGeneratorX86_64::VisitOr(HOr* instruction) {
HandleBitwiseOperation(instruction);
}
void InstructionCodeGeneratorX86_64::VisitXor(HXor* instruction) {
HandleBitwiseOperation(instruction);
}
void InstructionCodeGeneratorX86_64::HandleBitwiseOperation(HBinaryOperation* instruction) {
LocationSummary* locations = instruction->GetLocations();
Location first = locations->InAt(0);
Location second = locations->InAt(1);
DCHECK(first.Equals(locations->Out()));
if (instruction->GetResultType() == DataType::Type::kInt32) {
if (second.IsRegister()) {
if (instruction->IsAnd()) {
__ andl(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else if (instruction->IsOr()) {
__ orl(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
} else {
DCHECK(instruction->IsXor());
__ xorl(first.AsRegister<CpuRegister>(), second.AsRegister<CpuRegister>());
}
} else if (second.IsConstant()) {
Immediate imm(second.GetConstant()->AsIntConstant()->GetValue());
if (instruction->IsAnd()) {
__ andl(first.AsRegister<CpuRegister>(), imm);
} else if (instruction->IsOr()) {
__ orl(first.AsRegister<CpuRegister>(), imm);
} else {
DCHECK(instruction->IsXor());
__ xorl(first.AsRegister<CpuRegister>(), imm);
}
} else {
Address address(CpuRegister(RSP), second.GetStackIndex());
if (instruction->IsAnd()) {
__ andl(first.AsRegister<CpuRegister>(), address);
} else if (instruction->IsOr()) {
__ orl(first.AsRegister<CpuRegister>(), address);
} else {
DCHECK(instruction->IsXor());
__ xorl(first.AsRegister<CpuRegister>(), address);
}
}
} else {
DCHECK_EQ(instruction->GetResultType(), DataType::Type::kInt64);
CpuRegister first_reg = first.AsRegister<CpuRegister>();
bool second_is_constant = false;
int64_t value = 0;
if (second.IsConstant()) {
second_is_constant = true;
value = second.GetConstant()->AsLongConstant()->GetValue();
}
bool is_int32_value = IsInt<32>(value);
if (instruction->IsAnd()) {
if (second_is_constant) {
if (is_int32_value) {
__ andq(first_reg, Immediate(static_cast<int32_t>(value)));
} else {
__ andq(first_reg, codegen_->LiteralInt64Address(value));
}
} else if (second.IsDoubleStackSlot()) {
__ andq(first_reg, Address(CpuRegister(RSP), second.GetStackIndex()));
} else {
__ andq(first_reg, second.AsRegister<CpuRegister>());
}
} else if (instruction->IsOr()) {
if (second_is_constant) {
if (is_int32_value) {
__ orq(first_reg, Immediate(static_cast<int32_t>(value)));
} else {
__ orq(first_reg, codegen_->LiteralInt64Address(value));
}
} else if (second.IsDoubleStackSlot()) {
__ orq(first_reg, Address(CpuRegister(RSP), second.GetStackIndex()));
} else {
__ orq(first_reg, second.AsRegister<CpuRegister>());
}
} else {
DCHECK(instruction->IsXor());
if (second_is_constant) {
if (is_int32_value) {
__ xorq(first_reg, Immediate(static_cast<int32_t>(value)));
} else {
__ xorq(first_reg, codegen_->LiteralInt64Address(value));
}
} else if (second.IsDoubleStackSlot()) {
__ xorq(first_reg, Address(CpuRegister(RSP), second.GetStackIndex()));
} else {
__ xorq(first_reg, second.AsRegister<CpuRegister>());
}
}
}
}
void InstructionCodeGeneratorX86_64::GenerateReferenceLoadOneRegister(
HInstruction* instruction,
Location out,
uint32_t offset,
Location maybe_temp,
ReadBarrierOption read_barrier_option) {
CpuRegister out_reg = out.AsRegister<CpuRegister>();
if (read_barrier_option == kWithReadBarrier) {
CHECK(kEmitCompilerReadBarrier);
if (kUseBakerReadBarrier) {
// Load with fast path based Baker's read barrier.
// /* HeapReference<Object> */ out = *(out + offset)
codegen_->GenerateFieldLoadWithBakerReadBarrier(
instruction, out, out_reg, offset, /* needs_null_check */ false);
} else {
// Load with slow path based read barrier.
// Save the value of `out` into `maybe_temp` before overwriting it
// in the following move operation, as we will need it for the
// read barrier below.
DCHECK(maybe_temp.IsRegister()) << maybe_temp;
__ movl(maybe_temp.AsRegister<CpuRegister>(), out_reg);
// /* HeapReference<Object> */ out = *(out + offset)
__ movl(out_reg, Address(out_reg, offset));
codegen_->GenerateReadBarrierSlow(instruction, out, out, maybe_temp, offset);
}
} else {
// Plain load with no read barrier.
// /* HeapReference<Object> */ out = *(out + offset)
__ movl(out_reg, Address(out_reg, offset));
__ MaybeUnpoisonHeapReference(out_reg);
}
}
void InstructionCodeGeneratorX86_64::GenerateReferenceLoadTwoRegisters(
HInstruction* instruction,
Location out,
Location obj,
uint32_t offset,
ReadBarrierOption read_barrier_option) {
CpuRegister out_reg = out.AsRegister<CpuRegister>();
CpuRegister obj_reg = obj.AsRegister<CpuRegister>();
if (read_barrier_option == kWithReadBarrier) {
CHECK(kEmitCompilerReadBarrier);
if (kUseBakerReadBarrier) {
// Load with fast path based Baker's read barrier.
// /* HeapReference<Object> */ out = *(obj + offset)
codegen_->GenerateFieldLoadWithBakerReadBarrier(
instruction, out, obj_reg, offset, /* needs_null_check */ false);
} else {
// Load with slow path based read barrier.
// /* HeapReference<Object> */ out = *(obj + offset)
__ movl(out_reg, Address(obj_reg, offset));
codegen_->GenerateReadBarrierSlow(instruction, out, out, obj, offset);
}
} else {
// Plain load with no read barrier.
// /* HeapReference<Object> */ out = *(obj + offset)
__ movl(out_reg, Address(obj_reg, offset));
__ MaybeUnpoisonHeapReference(out_reg);
}
}
void InstructionCodeGeneratorX86_64::GenerateGcRootFieldLoad(
HInstruction* instruction,
Location root,
const Address& address,
Label* fixup_label,
ReadBarrierOption read_barrier_option) {
CpuRegister root_reg = root.AsRegister<CpuRegister>();
if (read_barrier_option == kWithReadBarrier) {
DCHECK(kEmitCompilerReadBarrier);
if (kUseBakerReadBarrier) {
// Fast path implementation of art::ReadBarrier::BarrierForRoot when
// Baker's read barrier are used:
//
// root = obj.field;
// temp = Thread::Current()->pReadBarrierMarkReg ## root.reg()
// if (temp != null) {
// root = temp(root)
// }
// /* GcRoot<mirror::Object> */ root = *address
__ movl(root_reg, address);
if (fixup_label != nullptr) {
__ Bind(fixup_label);
}
static_assert(
sizeof(mirror::CompressedReference<mirror::Object>) == sizeof(GcRoot<mirror::Object>),
"art::mirror::CompressedReference<mirror::Object> and art::GcRoot<mirror::Object> "
"have different sizes.");
static_assert(sizeof(mirror::CompressedReference<mirror::Object>) == sizeof(int32_t),
"art::mirror::CompressedReference<mirror::Object> and int32_t "
"have different sizes.");
// Slow path marking the GC root `root`.
SlowPathCode* slow_path = new (codegen_->GetScopedAllocator()) ReadBarrierMarkSlowPathX86_64(
instruction, root, /* unpoison_ref_before_marking */ false);
codegen_->AddSlowPath(slow_path);
// Test the `Thread::Current()->pReadBarrierMarkReg ## root.reg()` entrypoint.
const int32_t entry_point_offset =
Thread::ReadBarrierMarkEntryPointsOffset<kX86_64PointerSize>(root.reg());
__ gs()->cmpl(Address::Absolute(entry_point_offset, /* no_rip */ true), Immediate(0));
// The entrypoint is null when the GC is not marking.
__ j(kNotEqual, slow_path->GetEntryLabel());
__ Bind(slow_path->GetExitLabel());
} else {
// GC root loaded through a slow path for read barriers other
// than Baker's.
// /* GcRoot<mirror::Object>* */ root = address
__ leaq(root_reg, address);
if (fixup_label != nullptr) {
__ Bind(fixup_label);
}
// /* mirror::Object* */ root = root->Read()
codegen_->GenerateReadBarrierForRootSlow(instruction, root, root);
}
} else {
// Plain GC root load with no read barrier.
// /* GcRoot<mirror::Object> */ root = *address
__ movl(root_reg, address);
if (fixup_label != nullptr) {
__ Bind(fixup_label);
}
// Note that GC roots are not affected by heap poisoning, thus we
// do not have to unpoison `root_reg` here.
}
}
void CodeGeneratorX86_64::GenerateFieldLoadWithBakerReadBarrier(HInstruction* instruction,
Location ref,
CpuRegister obj,
uint32_t offset,
bool needs_null_check) {
DCHECK(kEmitCompilerReadBarrier);
DCHECK(kUseBakerReadBarrier);
// /* HeapReference<Object> */ ref = *(obj + offset)
Address src(obj, offset);
GenerateReferenceLoadWithBakerReadBarrier(instruction, ref, obj, src, needs_null_check);
}
void CodeGeneratorX86_64::GenerateArrayLoadWithBakerReadBarrier(HInstruction* instruction,
Location ref,
CpuRegister obj,
uint32_t data_offset,
Location index,
bool needs_null_check) {
DCHECK(kEmitCompilerReadBarrier);
DCHECK(kUseBakerReadBarrier);
static_assert(
sizeof(mirror::HeapReference<mirror::Object>) == sizeof(int32_t),
"art::mirror::HeapReference<art::mirror::Object> and int32_t have different sizes.");
// /* HeapReference<Object> */ ref =
// *(obj + data_offset + index * sizeof(HeapReference<Object>))
Address src = CodeGeneratorX86_64::ArrayAddress(obj, index, TIMES_4, data_offset);
GenerateReferenceLoadWithBakerReadBarrier(instruction, ref, obj, src, needs_null_check);
}
void CodeGeneratorX86_64::GenerateReferenceLoadWithBakerReadBarrier(HInstruction* instruction,
Location ref,
CpuRegister obj,
const Address& src,
bool needs_null_check,
bool always_update_field,
CpuRegister* temp1,
CpuRegister* temp2) {
DCHECK(kEmitCompilerReadBarrier);
DCHECK(kUseBakerReadBarrier);
// In slow path based read barriers, the read barrier call is
// inserted after the original load. However, in fast path based
// Baker's read barriers, we need to perform the load of
// mirror::Object::monitor_ *before* the original reference load.
// This load-load ordering is required by the read barrier.
// The fast path/slow path (for Baker's algorithm) should look like:
//
// uint32_t rb_state = Lockword(obj->monitor_).ReadBarrierState();
// lfence; // Load fence or artificial data dependency to prevent load-load reordering
// HeapReference<Object> ref = *src; // Original reference load.
// bool is_gray = (rb_state == ReadBarrier::GrayState());
// if (is_gray) {
// ref = ReadBarrier::Mark(ref); // Performed by runtime entrypoint slow path.
// }
//
// Note: the original implementation in ReadBarrier::Barrier is
// slightly more complex as:
// - it implements the load-load fence using a data dependency on
// the high-bits of rb_state, which are expected to be all zeroes
// (we use CodeGeneratorX86_64::GenerateMemoryBarrier instead
// here, which is a no-op thanks to the x86-64 memory model);
// - it performs additional checks that we do not do here for
// performance reasons.
CpuRegister ref_reg = ref.AsRegister<CpuRegister>();
uint32_t monitor_offset = mirror::Object::MonitorOffset().Int32Value();
// Given the numeric representation, it's enough to check the low bit of the rb_state.
static_assert(ReadBarrier::WhiteState() == 0, "Expecting white to have value 0");
static_assert(ReadBarrier::GrayState() == 1, "Expecting gray to have value 1");
constexpr uint32_t gray_byte_position = LockWord::kReadBarrierStateShift / kBitsPerByte;
constexpr uint32_t gray_bit_position = LockWord::kReadBarrierStateShift % kBitsPerByte;
constexpr int32_t test_value = static_cast<int8_t>(1 << gray_bit_position);
// if (rb_state == ReadBarrier::GrayState())
// ref = ReadBarrier::Mark(ref);
// At this point, just do the "if" and make sure that flags are preserved until the branch.
__ testb(Address(obj, monitor_offset + gray_byte_position), Immediate(test_value));
if (needs_null_check) {
MaybeRecordImplicitNullCheck(instruction);
}
// Load fence to prevent load-load reordering.
// Note that this is a no-op, thanks to the x86-64 memory model.
GenerateMemoryBarrier(MemBarrierKind::kLoadAny);
// The actual reference load.
// /* HeapReference<Object> */ ref = *src
__ movl(ref_reg, src); // Flags are unaffected.
// Note: Reference unpoisoning modifies the flags, so we need to delay it after the branch.
// Slow path marking the object `ref` when it is gray.
SlowPathCode* slow_path;
if (always_update_field) {
DCHECK(temp1 != nullptr);
DCHECK(temp2 != nullptr);
slow_path = new (GetScopedAllocator()) ReadBarrierMarkAndUpdateFieldSlowPathX86_64(
instruction, ref, obj, src, /* unpoison_ref_before_marking */ true, *temp1, *temp2);
} else {
slow_path = new (GetScopedAllocator()) ReadBarrierMarkSlowPathX86_64(
instruction, ref, /* unpoison_ref_before_marking */ true);
}
AddSlowPath(slow_path);
// We have done the "if" of the gray bit check above, now branch based on the flags.
__ j(kNotZero, slow_path->GetEntryLabel());
// Object* ref = ref_addr->AsMirrorPtr()
__ MaybeUnpoisonHeapReference(ref_reg);
__ Bind(slow_path->GetExitLabel());
}
void CodeGeneratorX86_64::GenerateReadBarrierSlow(HInstruction* instruction,
Location out,
Location ref,
Location obj,
uint32_t offset,
Location index) {
DCHECK(kEmitCompilerReadBarrier);
// Insert a slow path based read barrier *after* the reference load.
//
// If heap poisoning is enabled, the unpoisoning of the loaded
// reference will be carried out by the runtime within the slow
// path.
//
// Note that `ref` currently does not get unpoisoned (when heap
// poisoning is enabled), which is alright as the `ref` argument is
// not used by the artReadBarrierSlow entry point.
//
// TODO: Unpoison `ref` when it is used by artReadBarrierSlow.
SlowPathCode* slow_path = new (GetScopedAllocator())
ReadBarrierForHeapReferenceSlowPathX86_64(instruction, out, ref, obj, offset, index);
AddSlowPath(slow_path);
__ jmp(slow_path->GetEntryLabel());
__ Bind(slow_path->GetExitLabel());
}
void CodeGeneratorX86_64::MaybeGenerateReadBarrierSlow(HInstruction* instruction,
Location out,
Location ref,
Location obj,
uint32_t offset,
Location index) {
if (kEmitCompilerReadBarrier) {
// Baker's read barriers shall be handled by the fast path
// (CodeGeneratorX86_64::GenerateReferenceLoadWithBakerReadBarrier).
DCHECK(!kUseBakerReadBarrier);
// If heap poisoning is enabled, unpoisoning will be taken care of
// by the runtime within the slow path.
GenerateReadBarrierSlow(instruction, out, ref, obj, offset, index);
} else if (kPoisonHeapReferences) {
__ UnpoisonHeapReference(out.AsRegister<CpuRegister>());
}
}
void CodeGeneratorX86_64::GenerateReadBarrierForRootSlow(HInstruction* instruction,
Location out,
Location root) {
DCHECK(kEmitCompilerReadBarrier);
// Insert a slow path based read barrier *after* the GC root load.
//
// Note that GC roots are not affected by heap poisoning, so we do
// not need to do anything special for this here.
SlowPathCode* slow_path =
new (GetScopedAllocator()) ReadBarrierForRootSlowPathX86_64(instruction, out, root);
AddSlowPath(slow_path);
__ jmp(slow_path->GetEntryLabel());
__ Bind(slow_path->GetExitLabel());
}
void LocationsBuilderX86_64::VisitBoundType(HBoundType* instruction ATTRIBUTE_UNUSED) {
// Nothing to do, this should be removed during prepare for register allocator.
LOG(FATAL) << "Unreachable";
}
void InstructionCodeGeneratorX86_64::VisitBoundType(HBoundType* instruction ATTRIBUTE_UNUSED) {
// Nothing to do, this should be removed during prepare for register allocator.
LOG(FATAL) << "Unreachable";
}
// Simple implementation of packed switch - generate cascaded compare/jumps.
void LocationsBuilderX86_64::VisitPackedSwitch(HPackedSwitch* switch_instr) {
LocationSummary* locations =
new (GetGraph()->GetAllocator()) LocationSummary(switch_instr, LocationSummary::kNoCall);
locations->SetInAt(0, Location::RequiresRegister());
locations->AddTemp(Location::RequiresRegister());
locations->AddTemp(Location::RequiresRegister());
}
void InstructionCodeGeneratorX86_64::VisitPackedSwitch(HPackedSwitch* switch_instr) {
int32_t lower_bound = switch_instr->GetStartValue();
uint32_t num_entries = switch_instr->GetNumEntries();
LocationSummary* locations = switch_instr->GetLocations();
CpuRegister value_reg_in = locations->InAt(0).AsRegister<CpuRegister>();
CpuRegister temp_reg = locations->GetTemp(0).AsRegister<CpuRegister>();
CpuRegister base_reg = locations->GetTemp(1).AsRegister<CpuRegister>();
HBasicBlock* default_block = switch_instr->GetDefaultBlock();
// Should we generate smaller inline compare/jumps?
if (num_entries <= kPackedSwitchJumpTableThreshold) {
// Figure out the correct compare values and jump conditions.
// Handle the first compare/branch as a special case because it might
// jump to the default case.
DCHECK_GT(num_entries, 2u);
Condition first_condition;
uint32_t index;
const ArenaVector<HBasicBlock*>& successors = switch_instr->GetBlock()->GetSuccessors();
if (lower_bound != 0) {
first_condition = kLess;
__ cmpl(value_reg_in, Immediate(lower_bound));
__ j(first_condition, codegen_->GetLabelOf(default_block));
__ j(kEqual, codegen_->GetLabelOf(successors[0]));
index = 1;
} else {
// Handle all the compare/jumps below.
first_condition = kBelow;
index = 0;
}
// Handle the rest of the compare/jumps.
for (; index + 1 < num_entries; index += 2) {
int32_t compare_to_value = lower_bound + index + 1;
__ cmpl(value_reg_in, Immediate(compare_to_value));
// Jump to successors[index] if value < case_value[index].
__ j(first_condition, codegen_->GetLabelOf(successors[index]));
// Jump to successors[index + 1] if value == case_value[index + 1].
__ j(kEqual, codegen_->GetLabelOf(successors[index + 1]));
}
if (index != num_entries) {
// There are an odd number of entries. Handle the last one.
DCHECK_EQ(index + 1, num_entries);
__ cmpl(value_reg_in, Immediate(static_cast<int32_t>(lower_bound + index)));
__ j(kEqual, codegen_->GetLabelOf(successors[index]));
}
// And the default for any other value.
if (!codegen_->GoesToNextBlock(switch_instr->GetBlock(), default_block)) {
__ jmp(codegen_->GetLabelOf(default_block));
}
return;
}
// Remove the bias, if needed.
Register value_reg_out = value_reg_in.AsRegister();
if (lower_bound != 0) {
__ leal(temp_reg, Address(value_reg_in, -lower_bound));
value_reg_out = temp_reg.AsRegister();
}
CpuRegister value_reg(value_reg_out);
// Is the value in range?
__ cmpl(value_reg, Immediate(num_entries - 1));
__ j(kAbove, codegen_->GetLabelOf(default_block));
// We are in the range of the table.
// Load the address of the jump table in the constant area.
__ leaq(base_reg, codegen_->LiteralCaseTable(switch_instr));
// Load the (signed) offset from the jump table.
__ movsxd(temp_reg, Address(base_reg, value_reg, TIMES_4, 0));
// Add the offset to the address of the table base.
__ addq(temp_reg, base_reg);
// And jump.
__ jmp(temp_reg);
}
void LocationsBuilderX86_64::VisitIntermediateAddress(HIntermediateAddress* instruction
ATTRIBUTE_UNUSED) {
LOG(FATAL) << "Unreachable";
}
void InstructionCodeGeneratorX86_64::VisitIntermediateAddress(HIntermediateAddress* instruction
ATTRIBUTE_UNUSED) {
LOG(FATAL) << "Unreachable";
}
void CodeGeneratorX86_64::Load32BitValue(CpuRegister dest, int32_t value) {
if (value == 0) {
__ xorl(dest, dest);
} else {
__ movl(dest, Immediate(value));
}
}
void CodeGeneratorX86_64::Load64BitValue(CpuRegister dest, int64_t value) {
if (value == 0) {
// Clears upper bits too.
__ xorl(dest, dest);
} else if (IsUint<32>(value)) {
// We can use a 32 bit move, as it will zero-extend and is shorter.
__ movl(dest, Immediate(static_cast<int32_t>(value)));
} else {
__ movq(dest, Immediate(value));
}
}
void CodeGeneratorX86_64::Load32BitValue(XmmRegister dest, int32_t value) {
if (value == 0) {
__ xorps(dest, dest);
} else {
__ movss(dest, LiteralInt32Address(value));
}
}
void CodeGeneratorX86_64::Load64BitValue(XmmRegister dest, int64_t value) {
if (value == 0) {
__ xorpd(dest, dest);
} else {
__ movsd(dest, LiteralInt64Address(value));
}
}
void CodeGeneratorX86_64::Load32BitValue(XmmRegister dest, float value) {
Load32BitValue(dest, bit_cast<int32_t, float>(value));
}
void CodeGeneratorX86_64::Load64BitValue(XmmRegister dest, double value) {
Load64BitValue(dest, bit_cast<int64_t, double>(value));
}
void CodeGeneratorX86_64::Compare32BitValue(CpuRegister dest, int32_t value) {
if (value == 0) {
__ testl(dest, dest);
} else {
__ cmpl(dest, Immediate(value));
}
}
void CodeGeneratorX86_64::Compare64BitValue(CpuRegister dest, int64_t value) {
if (IsInt<32>(value)) {
if (value == 0) {
__ testq(dest, dest);
} else {
__ cmpq(dest, Immediate(static_cast<int32_t>(value)));
}
} else {
// Value won't fit in an int.
__ cmpq(dest, LiteralInt64Address(value));
}
}
void CodeGeneratorX86_64::GenerateIntCompare(Location lhs, Location rhs) {
CpuRegister lhs_reg = lhs.AsRegister<CpuRegister>();
GenerateIntCompare(lhs_reg, rhs);
}
void CodeGeneratorX86_64::GenerateIntCompare(CpuRegister lhs, Location rhs) {
if (rhs.IsConstant()) {
int32_t value = CodeGenerator::GetInt32ValueOf(rhs.GetConstant());
Compare32BitValue(lhs, value);
} else if (rhs.IsStackSlot()) {
__ cmpl(lhs, Address(CpuRegister(RSP), rhs.GetStackIndex()));
} else {
__ cmpl(lhs, rhs.AsRegister<CpuRegister>());
}
}
void CodeGeneratorX86_64::GenerateLongCompare(Location lhs, Location rhs) {
CpuRegister lhs_reg = lhs.AsRegister<CpuRegister>();
if (rhs.IsConstant()) {
int64_t value = rhs.GetConstant()->AsLongConstant()->GetValue();
Compare64BitValue(lhs_reg, value);
} else if (rhs.IsDoubleStackSlot()) {
__ cmpq(lhs_reg, Address(CpuRegister(RSP), rhs.GetStackIndex()));
} else {
__ cmpq(lhs_reg, rhs.AsRegister<CpuRegister>());
}
}
Address CodeGeneratorX86_64::ArrayAddress(CpuRegister obj,
Location index,
ScaleFactor scale,
uint32_t data_offset) {
return index.IsConstant() ?
Address(obj, (index.GetConstant()->AsIntConstant()->GetValue() << scale) + data_offset) :
Address(obj, index.AsRegister<CpuRegister>(), scale, data_offset);
}
void CodeGeneratorX86_64::Store64BitValueToStack(Location dest, int64_t value) {
DCHECK(dest.IsDoubleStackSlot());
if (IsInt<32>(value)) {
// Can move directly as an int32 constant.
__ movq(Address(CpuRegister(RSP), dest.GetStackIndex()),
Immediate(static_cast<int32_t>(value)));
} else {
Load64BitValue(CpuRegister(TMP), value);
__ movq(Address(CpuRegister(RSP), dest.GetStackIndex()), CpuRegister(TMP));
}
}
/**
* Class to handle late fixup of offsets into constant area.
*/
class RIPFixup : public AssemblerFixup, public ArenaObject<kArenaAllocCodeGenerator> {
public:
RIPFixup(CodeGeneratorX86_64& codegen, size_t offset)
: codegen_(&codegen), offset_into_constant_area_(offset) {}
protected:
void SetOffset(size_t offset) { offset_into_constant_area_ = offset; }
CodeGeneratorX86_64* codegen_;
private:
void Process(const MemoryRegion& region, int pos) OVERRIDE {
// Patch the correct offset for the instruction. We use the address of the
// 'next' instruction, which is 'pos' (patch the 4 bytes before).
int32_t constant_offset = codegen_->ConstantAreaStart() + offset_into_constant_area_;
int32_t relative_position = constant_offset - pos;
// Patch in the right value.
region.StoreUnaligned<int32_t>(pos - 4, relative_position);
}
// Location in constant area that the fixup refers to.
size_t offset_into_constant_area_;
};
/**
t * Class to handle late fixup of offsets to a jump table that will be created in the
* constant area.
*/
class JumpTableRIPFixup : public RIPFixup {
public:
JumpTableRIPFixup(CodeGeneratorX86_64& codegen, HPackedSwitch* switch_instr)
: RIPFixup(codegen, -1), switch_instr_(switch_instr) {}
void CreateJumpTable() {
X86_64Assembler* assembler = codegen_->GetAssembler();
// Ensure that the reference to the jump table has the correct offset.
const int32_t offset_in_constant_table = assembler->ConstantAreaSize();
SetOffset(offset_in_constant_table);
// Compute the offset from the start of the function to this jump table.
const int32_t current_table_offset = assembler->CodeSize() + offset_in_constant_table;
// Populate the jump table with the correct values for the jump table.
int32_t num_entries = switch_instr_->GetNumEntries();
HBasicBlock* block = switch_instr_->GetBlock();
const ArenaVector<HBasicBlock*>& successors = block->GetSuccessors();
// The value that we want is the target offset - the position of the table.
for (int32_t i = 0; i < num_entries; i++) {
HBasicBlock* b = successors[i];
Label* l = codegen_->GetLabelOf(b);
DCHECK(l->IsBound());
int32_t offset_to_block = l->Position() - current_table_offset;
assembler->AppendInt32(offset_to_block);
}
}
private:
const HPackedSwitch* switch_instr_;
};
void CodeGeneratorX86_64::Finalize(CodeAllocator* allocator) {
// Generate the constant area if needed.
X86_64Assembler* assembler = GetAssembler();
if (!assembler->IsConstantAreaEmpty() || !fixups_to_jump_tables_.empty()) {
// Align to 4 byte boundary to reduce cache misses, as the data is 4 and 8 byte values.
assembler->Align(4, 0);
constant_area_start_ = assembler->CodeSize();
// Populate any jump tables.
for (JumpTableRIPFixup* jump_table : fixups_to_jump_tables_) {
jump_table->CreateJumpTable();
}
// And now add the constant area to the generated code.
assembler->AddConstantArea();
}
// And finish up.
CodeGenerator::Finalize(allocator);
}
Address CodeGeneratorX86_64::LiteralDoubleAddress(double v) {
AssemblerFixup* fixup = new (GetGraph()->GetAllocator()) RIPFixup(*this, __ AddDouble(v));
return Address::RIP(fixup);
}
Address CodeGeneratorX86_64::LiteralFloatAddress(float v) {
AssemblerFixup* fixup = new (GetGraph()->GetAllocator()) RIPFixup(*this, __ AddFloat(v));
return Address::RIP(fixup);
}
Address CodeGeneratorX86_64::LiteralInt32Address(int32_t v) {
AssemblerFixup* fixup = new (GetGraph()->GetAllocator()) RIPFixup(*this, __ AddInt32(v));
return Address::RIP(fixup);
}
Address CodeGeneratorX86_64::LiteralInt64Address(int64_t v) {
AssemblerFixup* fixup = new (GetGraph()->GetAllocator()) RIPFixup(*this, __ AddInt64(v));
return Address::RIP(fixup);
}
// TODO: trg as memory.
void CodeGeneratorX86_64::MoveFromReturnRegister(Location trg, DataType::Type type) {
if (!trg.IsValid()) {
DCHECK_EQ(type, DataType::Type::kVoid);
return;
}
DCHECK_NE(type, DataType::Type::kVoid);
Location return_loc = InvokeDexCallingConventionVisitorX86_64().GetReturnLocation(type);
if (trg.Equals(return_loc)) {
return;
}
// Let the parallel move resolver take care of all of this.
HParallelMove parallel_move(GetGraph()->GetAllocator());
parallel_move.AddMove(return_loc, trg, type, nullptr);
GetMoveResolver()->EmitNativeCode(¶llel_move);
}
Address CodeGeneratorX86_64::LiteralCaseTable(HPackedSwitch* switch_instr) {
// Create a fixup to be used to create and address the jump table.
JumpTableRIPFixup* table_fixup =
new (GetGraph()->GetAllocator()) JumpTableRIPFixup(*this, switch_instr);
// We have to populate the jump tables.
fixups_to_jump_tables_.push_back(table_fixup);
return Address::RIP(table_fixup);
}
void CodeGeneratorX86_64::MoveInt64ToAddress(const Address& addr_low,
const Address& addr_high,
int64_t v,
HInstruction* instruction) {
if (IsInt<32>(v)) {
int32_t v_32 = v;
__ movq(addr_low, Immediate(v_32));
MaybeRecordImplicitNullCheck(instruction);
} else {
// Didn't fit in a register. Do it in pieces.
int32_t low_v = Low32Bits(v);
int32_t high_v = High32Bits(v);
__ movl(addr_low, Immediate(low_v));
MaybeRecordImplicitNullCheck(instruction);
__ movl(addr_high, Immediate(high_v));
}
}
void CodeGeneratorX86_64::PatchJitRootUse(uint8_t* code,
const uint8_t* roots_data,
const PatchInfo<Label>& info,
uint64_t index_in_table) const {
uint32_t code_offset = info.label.Position() - kLabelPositionToLiteralOffsetAdjustment;
uintptr_t address =
reinterpret_cast<uintptr_t>(roots_data) + index_in_table * sizeof(GcRoot<mirror::Object>);
typedef __attribute__((__aligned__(1))) uint32_t unaligned_uint32_t;
reinterpret_cast<unaligned_uint32_t*>(code + code_offset)[0] =
dchecked_integral_cast<uint32_t>(address);
}
void CodeGeneratorX86_64::EmitJitRootPatches(uint8_t* code, const uint8_t* roots_data) {
for (const PatchInfo<Label>& info : jit_string_patches_) {
StringReference string_reference(info.target_dex_file, dex::StringIndex(info.offset_or_index));
uint64_t index_in_table = GetJitStringRootIndex(string_reference);
PatchJitRootUse(code, roots_data, info, index_in_table);
}
for (const PatchInfo<Label>& info : jit_class_patches_) {
TypeReference type_reference(info.target_dex_file, dex::TypeIndex(info.offset_or_index));
uint64_t index_in_table = GetJitClassRootIndex(type_reference);
PatchJitRootUse(code, roots_data, info, index_in_table);
}
}
#undef __
} // namespace x86_64
} // namespace art