// Copyright (c) 1994-2006 Sun Microsystems Inc.
// All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// - Redistribution in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// - Neither the name of Sun Microsystems or the names of contributors may
// be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// The original source code covered by the above license above has been
// modified significantly by Google Inc.
// Copyright 2012 the V8 project authors. All rights reserved.
#ifndef V8_MIPS_ASSEMBLER_MIPS_H_
#define V8_MIPS_ASSEMBLER_MIPS_H_
#include <stdio.h>
#include "src/assembler.h"
#include "src/mips/constants-mips.h"
#include "src/serialize.h"
namespace v8 {
namespace internal {
// CPU Registers.
//
// 1) We would prefer to use an enum, but enum values are assignment-
// compatible with int, which has caused code-generation bugs.
//
// 2) We would prefer to use a class instead of a struct but we don't like
// the register initialization to depend on the particular initialization
// order (which appears to be different on OS X, Linux, and Windows for the
// installed versions of C++ we tried). Using a struct permits C-style
// "initialization". Also, the Register objects cannot be const as this
// forces initialization stubs in MSVC, making us dependent on initialization
// order.
//
// 3) By not using an enum, we are possibly preventing the compiler from
// doing certain constant folds, which may significantly reduce the
// code generated for some assembly instructions (because they boil down
// to a few constants). If this is a problem, we could change the code
// such that we use an enum in optimized mode, and the struct in debug
// mode. This way we get the compile-time error checking in debug mode
// and best performance in optimized code.
// -----------------------------------------------------------------------------
// Implementation of Register and FPURegister.
// Core register.
struct Register {
static const int kNumRegisters = v8::internal::kNumRegisters;
static const int kMaxNumAllocatableRegisters = 14; // v0 through t6 and cp.
static const int kSizeInBytes = 4;
static const int kCpRegister = 23; // cp (s7) is the 23rd register.
#if defined(V8_TARGET_LITTLE_ENDIAN)
static const int kMantissaOffset = 0;
static const int kExponentOffset = 4;
#elif defined(V8_TARGET_BIG_ENDIAN)
static const int kMantissaOffset = 4;
static const int kExponentOffset = 0;
#else
#error Unknown endianness
#endif
inline static int NumAllocatableRegisters();
static int ToAllocationIndex(Register reg) {
DCHECK((reg.code() - 2) < (kMaxNumAllocatableRegisters - 1) ||
reg.is(from_code(kCpRegister)));
return reg.is(from_code(kCpRegister)) ?
kMaxNumAllocatableRegisters - 1 : // Return last index for 'cp'.
reg.code() - 2; // zero_reg and 'at' are skipped.
}
static Register FromAllocationIndex(int index) {
DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
return index == kMaxNumAllocatableRegisters - 1 ?
from_code(kCpRegister) : // Last index is always the 'cp' register.
from_code(index + 2); // zero_reg and 'at' are skipped.
}
static const char* AllocationIndexToString(int index) {
DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
const char* const names[] = {
"v0",
"v1",
"a0",
"a1",
"a2",
"a3",
"t0",
"t1",
"t2",
"t3",
"t4",
"t5",
"t6",
"s7",
};
return names[index];
}
static Register from_code(int code) {
Register r = { code };
return r;
}
bool is_valid() const { return 0 <= code_ && code_ < kNumRegisters; }
bool is(Register reg) const { return code_ == reg.code_; }
int code() const {
DCHECK(is_valid());
return code_;
}
int bit() const {
DCHECK(is_valid());
return 1 << code_;
}
// Unfortunately we can't make this private in a struct.
int code_;
};
#define REGISTER(N, C) \
const int kRegister_ ## N ## _Code = C; \
const Register N = { C }
REGISTER(no_reg, -1);
// Always zero.
REGISTER(zero_reg, 0);
// at: Reserved for synthetic instructions.
REGISTER(at, 1);
// v0, v1: Used when returning multiple values from subroutines.
REGISTER(v0, 2);
REGISTER(v1, 3);
// a0 - a4: Used to pass non-FP parameters.
REGISTER(a0, 4);
REGISTER(a1, 5);
REGISTER(a2, 6);
REGISTER(a3, 7);
// t0 - t9: Can be used without reservation, act as temporary registers and are
// allowed to be destroyed by subroutines.
REGISTER(t0, 8);
REGISTER(t1, 9);
REGISTER(t2, 10);
REGISTER(t3, 11);
REGISTER(t4, 12);
REGISTER(t5, 13);
REGISTER(t6, 14);
REGISTER(t7, 15);
// s0 - s7: Subroutine register variables. Subroutines that write to these
// registers must restore their values before exiting so that the caller can
// expect the values to be preserved.
REGISTER(s0, 16);
REGISTER(s1, 17);
REGISTER(s2, 18);
REGISTER(s3, 19);
REGISTER(s4, 20);
REGISTER(s5, 21);
REGISTER(s6, 22);
REGISTER(s7, 23);
REGISTER(t8, 24);
REGISTER(t9, 25);
// k0, k1: Reserved for system calls and interrupt handlers.
REGISTER(k0, 26);
REGISTER(k1, 27);
// gp: Reserved.
REGISTER(gp, 28);
// sp: Stack pointer.
REGISTER(sp, 29);
// fp: Frame pointer.
REGISTER(fp, 30);
// ra: Return address pointer.
REGISTER(ra, 31);
#undef REGISTER
int ToNumber(Register reg);
Register ToRegister(int num);
// Coprocessor register.
struct FPURegister {
static const int kMaxNumRegisters = v8::internal::kNumFPURegisters;
// TODO(plind): Warning, inconsistent numbering here. kNumFPURegisters refers
// to number of 32-bit FPU regs, but kNumAllocatableRegisters refers to
// number of Double regs (64-bit regs, or FPU-reg-pairs).
// A few double registers are reserved: one as a scratch register and one to
// hold 0.0.
// f28: 0.0
// f30: scratch register.
static const int kNumReservedRegisters = 2;
static const int kMaxNumAllocatableRegisters = kMaxNumRegisters / 2 -
kNumReservedRegisters;
inline static int NumRegisters();
inline static int NumAllocatableRegisters();
inline static int ToAllocationIndex(FPURegister reg);
static const char* AllocationIndexToString(int index);
static FPURegister FromAllocationIndex(int index) {
DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
return from_code(index * 2);
}
static FPURegister from_code(int code) {
FPURegister r = { code };
return r;
}
bool is_valid() const { return 0 <= code_ && code_ < kMaxNumRegisters ; }
bool is(FPURegister creg) const { return code_ == creg.code_; }
FPURegister low() const {
// Find low reg of a Double-reg pair, which is the reg itself.
DCHECK(code_ % 2 == 0); // Specified Double reg must be even.
FPURegister reg;
reg.code_ = code_;
DCHECK(reg.is_valid());
return reg;
}
FPURegister high() const {
// Find high reg of a Doubel-reg pair, which is reg + 1.
DCHECK(code_ % 2 == 0); // Specified Double reg must be even.
FPURegister reg;
reg.code_ = code_ + 1;
DCHECK(reg.is_valid());
return reg;
}
int code() const {
DCHECK(is_valid());
return code_;
}
int bit() const {
DCHECK(is_valid());
return 1 << code_;
}
void setcode(int f) {
code_ = f;
DCHECK(is_valid());
}
// Unfortunately we can't make this private in a struct.
int code_;
};
// V8 now supports the O32 ABI, and the FPU Registers are organized as 32
// 32-bit registers, f0 through f31. When used as 'double' they are used
// in pairs, starting with the even numbered register. So a double operation
// on f0 really uses f0 and f1.
// (Modern mips hardware also supports 32 64-bit registers, via setting
// (priviledged) Status Register FR bit to 1. This is used by the N32 ABI,
// but it is not in common use. Someday we will want to support this in v8.)
// For O32 ABI, Floats and Doubles refer to same set of 32 32-bit registers.
typedef FPURegister DoubleRegister;
typedef FPURegister FloatRegister;
const FPURegister no_freg = { -1 };
const FPURegister f0 = { 0 }; // Return value in hard float mode.
const FPURegister f1 = { 1 };
const FPURegister f2 = { 2 };
const FPURegister f3 = { 3 };
const FPURegister f4 = { 4 };
const FPURegister f5 = { 5 };
const FPURegister f6 = { 6 };
const FPURegister f7 = { 7 };
const FPURegister f8 = { 8 };
const FPURegister f9 = { 9 };
const FPURegister f10 = { 10 };
const FPURegister f11 = { 11 };
const FPURegister f12 = { 12 }; // Arg 0 in hard float mode.
const FPURegister f13 = { 13 };
const FPURegister f14 = { 14 }; // Arg 1 in hard float mode.
const FPURegister f15 = { 15 };
const FPURegister f16 = { 16 };
const FPURegister f17 = { 17 };
const FPURegister f18 = { 18 };
const FPURegister f19 = { 19 };
const FPURegister f20 = { 20 };
const FPURegister f21 = { 21 };
const FPURegister f22 = { 22 };
const FPURegister f23 = { 23 };
const FPURegister f24 = { 24 };
const FPURegister f25 = { 25 };
const FPURegister f26 = { 26 };
const FPURegister f27 = { 27 };
const FPURegister f28 = { 28 };
const FPURegister f29 = { 29 };
const FPURegister f30 = { 30 };
const FPURegister f31 = { 31 };
// Register aliases.
// cp is assumed to be a callee saved register.
// Defined using #define instead of "static const Register&" because Clang
// complains otherwise when a compilation unit that includes this header
// doesn't use the variables.
#define kRootRegister s6
#define cp s7
#define kLithiumScratchReg s3
#define kLithiumScratchReg2 s4
#define kLithiumScratchDouble f30
#define kDoubleRegZero f28
// Used on mips32r6 for compare operations.
#define kDoubleCompareReg f31
// FPU (coprocessor 1) control registers.
// Currently only FCSR (#31) is implemented.
struct FPUControlRegister {
bool is_valid() const { return code_ == kFCSRRegister; }
bool is(FPUControlRegister creg) const { return code_ == creg.code_; }
int code() const {
DCHECK(is_valid());
return code_;
}
int bit() const {
DCHECK(is_valid());
return 1 << code_;
}
void setcode(int f) {
code_ = f;
DCHECK(is_valid());
}
// Unfortunately we can't make this private in a struct.
int code_;
};
const FPUControlRegister no_fpucreg = { kInvalidFPUControlRegister };
const FPUControlRegister FCSR = { kFCSRRegister };
// -----------------------------------------------------------------------------
// Machine instruction Operands.
// Class Operand represents a shifter operand in data processing instructions.
class Operand BASE_EMBEDDED {
public:
// Immediate.
INLINE(explicit Operand(int32_t immediate,
RelocInfo::Mode rmode = RelocInfo::NONE32));
INLINE(explicit Operand(const ExternalReference& f));
INLINE(explicit Operand(const char* s));
INLINE(explicit Operand(Object** opp));
INLINE(explicit Operand(Context** cpp));
explicit Operand(Handle<Object> handle);
INLINE(explicit Operand(Smi* value));
// Register.
INLINE(explicit Operand(Register rm));
// Return true if this is a register operand.
INLINE(bool is_reg() const);
inline int32_t immediate() const {
DCHECK(!is_reg());
return imm32_;
}
Register rm() const { return rm_; }
private:
Register rm_;
int32_t imm32_; // Valid if rm_ == no_reg.
RelocInfo::Mode rmode_;
friend class Assembler;
friend class MacroAssembler;
};
// On MIPS we have only one adressing mode with base_reg + offset.
// Class MemOperand represents a memory operand in load and store instructions.
class MemOperand : public Operand {
public:
// Immediate value attached to offset.
enum OffsetAddend {
offset_minus_one = -1,
offset_zero = 0
};
explicit MemOperand(Register rn, int32_t offset = 0);
explicit MemOperand(Register rn, int32_t unit, int32_t multiplier,
OffsetAddend offset_addend = offset_zero);
int32_t offset() const { return offset_; }
bool OffsetIsInt16Encodable() const {
return is_int16(offset_);
}
private:
int32_t offset_;
friend class Assembler;
};
class Assembler : public AssemblerBase {
public:
// Create an assembler. Instructions and relocation information are emitted
// into a buffer, with the instructions starting from the beginning and the
// relocation information starting from the end of the buffer. See CodeDesc
// for a detailed comment on the layout (globals.h).
//
// If the provided buffer is NULL, the assembler allocates and grows its own
// buffer, and buffer_size determines the initial buffer size. The buffer is
// owned by the assembler and deallocated upon destruction of the assembler.
//
// If the provided buffer is not NULL, the assembler uses the provided buffer
// for code generation and assumes its size to be buffer_size. If the buffer
// is too small, a fatal error occurs. No deallocation of the buffer is done
// upon destruction of the assembler.
Assembler(Isolate* isolate, void* buffer, int buffer_size);
virtual ~Assembler() { }
// GetCode emits any pending (non-emitted) code and fills the descriptor
// desc. GetCode() is idempotent; it returns the same result if no other
// Assembler functions are invoked in between GetCode() calls.
void GetCode(CodeDesc* desc);
// Label operations & relative jumps (PPUM Appendix D).
//
// Takes a branch opcode (cc) and a label (L) and generates
// either a backward branch or a forward branch and links it
// to the label fixup chain. Usage:
//
// Label L; // unbound label
// j(cc, &L); // forward branch to unbound label
// bind(&L); // bind label to the current pc
// j(cc, &L); // backward branch to bound label
// bind(&L); // illegal: a label may be bound only once
//
// Note: The same Label can be used for forward and backward branches
// but it may be bound only once.
void bind(Label* L); // Binds an unbound label L to current code position.
// Determines if Label is bound and near enough so that branch instruction
// can be used to reach it, instead of jump instruction.
bool is_near(Label* L);
// Returns the branch offset to the given label from the current code
// position. Links the label to the current position if it is still unbound.
// Manages the jump elimination optimization if the second parameter is true.
int32_t branch_offset(Label* L, bool jump_elimination_allowed);
int32_t branch_offset_compact(Label* L, bool jump_elimination_allowed);
int32_t branch_offset21(Label* L, bool jump_elimination_allowed);
int32_t branch_offset21_compact(Label* L, bool jump_elimination_allowed);
int32_t shifted_branch_offset(Label* L, bool jump_elimination_allowed) {
int32_t o = branch_offset(L, jump_elimination_allowed);
DCHECK((o & 3) == 0); // Assert the offset is aligned.
return o >> 2;
}
int32_t shifted_branch_offset_compact(Label* L,
bool jump_elimination_allowed) {
int32_t o = branch_offset_compact(L, jump_elimination_allowed);
DCHECK((o & 3) == 0); // Assert the offset is aligned.
return o >> 2;
}
uint32_t jump_address(Label* L);
// Puts a labels target address at the given position.
// The high 8 bits are set to zero.
void label_at_put(Label* L, int at_offset);
// Read/Modify the code target address in the branch/call instruction at pc.
static Address target_address_at(Address pc);
static void set_target_address_at(Address pc,
Address target,
ICacheFlushMode icache_flush_mode =
FLUSH_ICACHE_IF_NEEDED);
// On MIPS there is no Constant Pool so we skip that parameter.
INLINE(static Address target_address_at(Address pc,
ConstantPoolArray* constant_pool)) {
return target_address_at(pc);
}
INLINE(static void set_target_address_at(Address pc,
ConstantPoolArray* constant_pool,
Address target,
ICacheFlushMode icache_flush_mode =
FLUSH_ICACHE_IF_NEEDED)) {
set_target_address_at(pc, target, icache_flush_mode);
}
INLINE(static Address target_address_at(Address pc, Code* code)) {
ConstantPoolArray* constant_pool = code ? code->constant_pool() : NULL;
return target_address_at(pc, constant_pool);
}
INLINE(static void set_target_address_at(Address pc,
Code* code,
Address target,
ICacheFlushMode icache_flush_mode =
FLUSH_ICACHE_IF_NEEDED)) {
ConstantPoolArray* constant_pool = code ? code->constant_pool() : NULL;
set_target_address_at(pc, constant_pool, target, icache_flush_mode);
}
// Return the code target address at a call site from the return address
// of that call in the instruction stream.
inline static Address target_address_from_return_address(Address pc);
// Return the code target address of the patch debug break slot
inline static Address break_address_from_return_address(Address pc);
static void JumpLabelToJumpRegister(Address pc);
static void QuietNaN(HeapObject* nan);
// This sets the branch destination (which gets loaded at the call address).
// This is for calls and branches within generated code. The serializer
// has already deserialized the lui/ori instructions etc.
inline static void deserialization_set_special_target_at(
Address instruction_payload, Code* code, Address target) {
set_target_address_at(
instruction_payload - kInstructionsFor32BitConstant * kInstrSize,
code,
target);
}
// Size of an instruction.
static const int kInstrSize = sizeof(Instr);
// Difference between address of current opcode and target address offset.
static const int kBranchPCOffset = 4;
// Here we are patching the address in the LUI/ORI instruction pair.
// These values are used in the serialization process and must be zero for
// MIPS platform, as Code, Embedded Object or External-reference pointers
// are split across two consecutive instructions and don't exist separately
// in the code, so the serializer should not step forwards in memory after
// a target is resolved and written.
static const int kSpecialTargetSize = 0;
// Number of consecutive instructions used to store 32bit constant.
// Before jump-optimizations, this constant was used in
// RelocInfo::target_address_address() function to tell serializer address of
// the instruction that follows LUI/ORI instruction pair. Now, with new jump
// optimization, where jump-through-register instruction that usually
// follows LUI/ORI pair is substituted with J/JAL, this constant equals
// to 3 instructions (LUI+ORI+J/JAL/JR/JALR).
static const int kInstructionsFor32BitConstant = 3;
// Distance between the instruction referring to the address of the call
// target and the return address.
static const int kCallTargetAddressOffset = 4 * kInstrSize;
// Distance between start of patched return sequence and the emitted address
// to jump to.
static const int kPatchReturnSequenceAddressOffset = 0;
// Distance between start of patched debug break slot and the emitted address
// to jump to.
static const int kPatchDebugBreakSlotAddressOffset = 0 * kInstrSize;
// Difference between address of current opcode and value read from pc
// register.
static const int kPcLoadDelta = 4;
static const int kPatchDebugBreakSlotReturnOffset = 4 * kInstrSize;
// Number of instructions used for the JS return sequence. The constant is
// used by the debugger to patch the JS return sequence.
static const int kJSReturnSequenceInstructions = 7;
static const int kDebugBreakSlotInstructions = 4;
static const int kDebugBreakSlotLength =
kDebugBreakSlotInstructions * kInstrSize;
// ---------------------------------------------------------------------------
// Code generation.
// Insert the smallest number of nop instructions
// possible to align the pc offset to a multiple
// of m. m must be a power of 2 (>= 4).
void Align(int m);
// Aligns code to something that's optimal for a jump target for the platform.
void CodeTargetAlign();
// Different nop operations are used by the code generator to detect certain
// states of the generated code.
enum NopMarkerTypes {
NON_MARKING_NOP = 0,
DEBUG_BREAK_NOP,
// IC markers.
PROPERTY_ACCESS_INLINED,
PROPERTY_ACCESS_INLINED_CONTEXT,
PROPERTY_ACCESS_INLINED_CONTEXT_DONT_DELETE,
// Helper values.
LAST_CODE_MARKER,
FIRST_IC_MARKER = PROPERTY_ACCESS_INLINED,
// Code aging
CODE_AGE_MARKER_NOP = 6,
CODE_AGE_SEQUENCE_NOP
};
// Type == 0 is the default non-marking nop. For mips this is a
// sll(zero_reg, zero_reg, 0). We use rt_reg == at for non-zero
// marking, to avoid conflict with ssnop and ehb instructions.
void nop(unsigned int type = 0) {
DCHECK(type < 32);
Register nop_rt_reg = (type == 0) ? zero_reg : at;
sll(zero_reg, nop_rt_reg, type, true);
}
// --------Branch-and-jump-instructions----------
// We don't use likely variant of instructions.
void b(int16_t offset);
void b(Label* L) { b(branch_offset(L, false)>>2); }
void bal(int16_t offset);
void bal(Label* L) { bal(branch_offset(L, false)>>2); }
void beq(Register rs, Register rt, int16_t offset);
void beq(Register rs, Register rt, Label* L) {
beq(rs, rt, branch_offset(L, false) >> 2);
}
void bgez(Register rs, int16_t offset);
void bgezc(Register rt, int16_t offset);
void bgezc(Register rt, Label* L) {
bgezc(rt, branch_offset_compact(L, false)>>2);
}
void bgeuc(Register rs, Register rt, int16_t offset);
void bgeuc(Register rs, Register rt, Label* L) {
bgeuc(rs, rt, branch_offset_compact(L, false)>>2);
}
void bgec(Register rs, Register rt, int16_t offset);
void bgec(Register rs, Register rt, Label* L) {
bgec(rs, rt, branch_offset_compact(L, false)>>2);
}
void bgezal(Register rs, int16_t offset);
void bgezalc(Register rt, int16_t offset);
void bgezalc(Register rt, Label* L) {
bgezalc(rt, branch_offset_compact(L, false)>>2);
}
void bgezall(Register rs, int16_t offset);
void bgezall(Register rs, Label* L) {
bgezall(rs, branch_offset(L, false)>>2);
}
void bgtz(Register rs, int16_t offset);
void bgtzc(Register rt, int16_t offset);
void bgtzc(Register rt, Label* L) {
bgtzc(rt, branch_offset_compact(L, false)>>2);
}
void blez(Register rs, int16_t offset);
void blezc(Register rt, int16_t offset);
void blezc(Register rt, Label* L) {
blezc(rt, branch_offset_compact(L, false)>>2);
}
void bltz(Register rs, int16_t offset);
void bltzc(Register rt, int16_t offset);
void bltzc(Register rt, Label* L) {
bltzc(rt, branch_offset_compact(L, false)>>2);
}
void bltuc(Register rs, Register rt, int16_t offset);
void bltuc(Register rs, Register rt, Label* L) {
bltuc(rs, rt, branch_offset_compact(L, false)>>2);
}
void bltc(Register rs, Register rt, int16_t offset);
void bltc(Register rs, Register rt, Label* L) {
bltc(rs, rt, branch_offset_compact(L, false)>>2);
}
void bltzal(Register rs, int16_t offset);
void blezalc(Register rt, int16_t offset);
void blezalc(Register rt, Label* L) {
blezalc(rt, branch_offset_compact(L, false)>>2);
}
void bltzalc(Register rt, int16_t offset);
void bltzalc(Register rt, Label* L) {
bltzalc(rt, branch_offset_compact(L, false)>>2);
}
void bgtzalc(Register rt, int16_t offset);
void bgtzalc(Register rt, Label* L) {
bgtzalc(rt, branch_offset_compact(L, false)>>2);
}
void beqzalc(Register rt, int16_t offset);
void beqzalc(Register rt, Label* L) {
beqzalc(rt, branch_offset_compact(L, false)>>2);
}
void beqc(Register rs, Register rt, int16_t offset);
void beqc(Register rs, Register rt, Label* L) {
beqc(rs, rt, branch_offset_compact(L, false)>>2);
}
void beqzc(Register rs, int32_t offset);
void beqzc(Register rs, Label* L) {
beqzc(rs, branch_offset21_compact(L, false)>>2);
}
void bnezalc(Register rt, int16_t offset);
void bnezalc(Register rt, Label* L) {
bnezalc(rt, branch_offset_compact(L, false)>>2);
}
void bnec(Register rs, Register rt, int16_t offset);
void bnec(Register rs, Register rt, Label* L) {
bnec(rs, rt, branch_offset_compact(L, false)>>2);
}
void bnezc(Register rt, int32_t offset);
void bnezc(Register rt, Label* L) {
bnezc(rt, branch_offset21_compact(L, false)>>2);
}
void bne(Register rs, Register rt, int16_t offset);
void bne(Register rs, Register rt, Label* L) {
bne(rs, rt, branch_offset(L, false)>>2);
}
void bovc(Register rs, Register rt, int16_t offset);
void bovc(Register rs, Register rt, Label* L) {
bovc(rs, rt, branch_offset_compact(L, false)>>2);
}
void bnvc(Register rs, Register rt, int16_t offset);
void bnvc(Register rs, Register rt, Label* L) {
bnvc(rs, rt, branch_offset_compact(L, false)>>2);
}
// Never use the int16_t b(l)cond version with a branch offset
// instead of using the Label* version.
// Jump targets must be in the current 256 MB-aligned region. i.e. 28 bits.
void j(int32_t target);
void jal(int32_t target);
void jalr(Register rs, Register rd = ra);
void jr(Register target);
void j_or_jr(int32_t target, Register rs);
void jal_or_jalr(int32_t target, Register rs);
// -------Data-processing-instructions---------
// Arithmetic.
void addu(Register rd, Register rs, Register rt);
void subu(Register rd, Register rs, Register rt);
void mult(Register rs, Register rt);
void multu(Register rs, Register rt);
void div(Register rs, Register rt);
void divu(Register rs, Register rt);
void div(Register rd, Register rs, Register rt);
void divu(Register rd, Register rs, Register rt);
void mod(Register rd, Register rs, Register rt);
void modu(Register rd, Register rs, Register rt);
void mul(Register rd, Register rs, Register rt);
void muh(Register rd, Register rs, Register rt);
void mulu(Register rd, Register rs, Register rt);
void muhu(Register rd, Register rs, Register rt);
void addiu(Register rd, Register rs, int32_t j);
// Logical.
void and_(Register rd, Register rs, Register rt);
void or_(Register rd, Register rs, Register rt);
void xor_(Register rd, Register rs, Register rt);
void nor(Register rd, Register rs, Register rt);
void andi(Register rd, Register rs, int32_t j);
void ori(Register rd, Register rs, int32_t j);
void xori(Register rd, Register rs, int32_t j);
void lui(Register rd, int32_t j);
void aui(Register rs, Register rt, int32_t j);
// Shifts.
// Please note: sll(zero_reg, zero_reg, x) instructions are reserved as nop
// and may cause problems in normal code. coming_from_nop makes sure this
// doesn't happen.
void sll(Register rd, Register rt, uint16_t sa, bool coming_from_nop = false);
void sllv(Register rd, Register rt, Register rs);
void srl(Register rd, Register rt, uint16_t sa);
void srlv(Register rd, Register rt, Register rs);
void sra(Register rt, Register rd, uint16_t sa);
void srav(Register rt, Register rd, Register rs);
void rotr(Register rd, Register rt, uint16_t sa);
void rotrv(Register rd, Register rt, Register rs);
// ------------Memory-instructions-------------
void lb(Register rd, const MemOperand& rs);
void lbu(Register rd, const MemOperand& rs);
void lh(Register rd, const MemOperand& rs);
void lhu(Register rd, const MemOperand& rs);
void lw(Register rd, const MemOperand& rs);
void lwl(Register rd, const MemOperand& rs);
void lwr(Register rd, const MemOperand& rs);
void sb(Register rd, const MemOperand& rs);
void sh(Register rd, const MemOperand& rs);
void sw(Register rd, const MemOperand& rs);
void swl(Register rd, const MemOperand& rs);
void swr(Register rd, const MemOperand& rs);
// ----------------Prefetch--------------------
void pref(int32_t hint, const MemOperand& rs);
// -------------Misc-instructions--------------
// Break / Trap instructions.
void break_(uint32_t code, bool break_as_stop = false);
void stop(const char* msg, uint32_t code = kMaxStopCode);
void tge(Register rs, Register rt, uint16_t code);
void tgeu(Register rs, Register rt, uint16_t code);
void tlt(Register rs, Register rt, uint16_t code);
void tltu(Register rs, Register rt, uint16_t code);
void teq(Register rs, Register rt, uint16_t code);
void tne(Register rs, Register rt, uint16_t code);
// Move from HI/LO register.
void mfhi(Register rd);
void mflo(Register rd);
// Set on less than.
void slt(Register rd, Register rs, Register rt);
void sltu(Register rd, Register rs, Register rt);
void slti(Register rd, Register rs, int32_t j);
void sltiu(Register rd, Register rs, int32_t j);
// Conditional move.
void movz(Register rd, Register rs, Register rt);
void movn(Register rd, Register rs, Register rt);
void movt(Register rd, Register rs, uint16_t cc = 0);
void movf(Register rd, Register rs, uint16_t cc = 0);
void sel(SecondaryField fmt, FPURegister fd, FPURegister ft,
FPURegister fs, uint8_t sel);
void seleqz(Register rs, Register rt, Register rd);
void seleqz(SecondaryField fmt, FPURegister fd, FPURegister ft,
FPURegister fs);
void selnez(Register rs, Register rt, Register rd);
void selnez(SecondaryField fmt, FPURegister fd, FPURegister ft,
FPURegister fs);
// Bit twiddling.
void clz(Register rd, Register rs);
void ins_(Register rt, Register rs, uint16_t pos, uint16_t size);
void ext_(Register rt, Register rs, uint16_t pos, uint16_t size);
// --------Coprocessor-instructions----------------
// Load, store, and move.
void lwc1(FPURegister fd, const MemOperand& src);
void ldc1(FPURegister fd, const MemOperand& src);
void swc1(FPURegister fs, const MemOperand& dst);
void sdc1(FPURegister fs, const MemOperand& dst);
void mtc1(Register rt, FPURegister fs);
void mthc1(Register rt, FPURegister fs);
void mfc1(Register rt, FPURegister fs);
void mfhc1(Register rt, FPURegister fs);
void ctc1(Register rt, FPUControlRegister fs);
void cfc1(Register rt, FPUControlRegister fs);
// Arithmetic.
void add_d(FPURegister fd, FPURegister fs, FPURegister ft);
void sub_d(FPURegister fd, FPURegister fs, FPURegister ft);
void mul_d(FPURegister fd, FPURegister fs, FPURegister ft);
void madd_d(FPURegister fd, FPURegister fr, FPURegister fs, FPURegister ft);
void div_d(FPURegister fd, FPURegister fs, FPURegister ft);
void abs_d(FPURegister fd, FPURegister fs);
void mov_d(FPURegister fd, FPURegister fs);
void neg_d(FPURegister fd, FPURegister fs);
void sqrt_d(FPURegister fd, FPURegister fs);
// Conversion.
void cvt_w_s(FPURegister fd, FPURegister fs);
void cvt_w_d(FPURegister fd, FPURegister fs);
void trunc_w_s(FPURegister fd, FPURegister fs);
void trunc_w_d(FPURegister fd, FPURegister fs);
void round_w_s(FPURegister fd, FPURegister fs);
void round_w_d(FPURegister fd, FPURegister fs);
void floor_w_s(FPURegister fd, FPURegister fs);
void floor_w_d(FPURegister fd, FPURegister fs);
void ceil_w_s(FPURegister fd, FPURegister fs);
void ceil_w_d(FPURegister fd, FPURegister fs);
void cvt_l_s(FPURegister fd, FPURegister fs);
void cvt_l_d(FPURegister fd, FPURegister fs);
void trunc_l_s(FPURegister fd, FPURegister fs);
void trunc_l_d(FPURegister fd, FPURegister fs);
void round_l_s(FPURegister fd, FPURegister fs);
void round_l_d(FPURegister fd, FPURegister fs);
void floor_l_s(FPURegister fd, FPURegister fs);
void floor_l_d(FPURegister fd, FPURegister fs);
void ceil_l_s(FPURegister fd, FPURegister fs);
void ceil_l_d(FPURegister fd, FPURegister fs);
void min(SecondaryField fmt, FPURegister fd, FPURegister ft, FPURegister fs);
void mina(SecondaryField fmt, FPURegister fd, FPURegister ft, FPURegister fs);
void max(SecondaryField fmt, FPURegister fd, FPURegister ft, FPURegister fs);
void maxa(SecondaryField fmt, FPURegister fd, FPURegister ft, FPURegister fs);
void cvt_s_w(FPURegister fd, FPURegister fs);
void cvt_s_l(FPURegister fd, FPURegister fs);
void cvt_s_d(FPURegister fd, FPURegister fs);
void cvt_d_w(FPURegister fd, FPURegister fs);
void cvt_d_l(FPURegister fd, FPURegister fs);
void cvt_d_s(FPURegister fd, FPURegister fs);
// Conditions and branches for MIPSr6.
void cmp(FPUCondition cond, SecondaryField fmt,
FPURegister fd, FPURegister ft, FPURegister fs);
void bc1eqz(int16_t offset, FPURegister ft);
void bc1eqz(Label* L, FPURegister ft) {
bc1eqz(branch_offset(L, false)>>2, ft);
}
void bc1nez(int16_t offset, FPURegister ft);
void bc1nez(Label* L, FPURegister ft) {
bc1nez(branch_offset(L, false)>>2, ft);
}
// Conditions and branches for non MIPSr6.
void c(FPUCondition cond, SecondaryField fmt,
FPURegister ft, FPURegister fs, uint16_t cc = 0);
void bc1f(int16_t offset, uint16_t cc = 0);
void bc1f(Label* L, uint16_t cc = 0) { bc1f(branch_offset(L, false)>>2, cc); }
void bc1t(int16_t offset, uint16_t cc = 0);
void bc1t(Label* L, uint16_t cc = 0) { bc1t(branch_offset(L, false)>>2, cc); }
void fcmp(FPURegister src1, const double src2, FPUCondition cond);
// Check the code size generated from label to here.
int SizeOfCodeGeneratedSince(Label* label) {
return pc_offset() - label->pos();
}
// Check the number of instructions generated from label to here.
int InstructionsGeneratedSince(Label* label) {
return SizeOfCodeGeneratedSince(label) / kInstrSize;
}
// Class for scoping postponing the trampoline pool generation.
class BlockTrampolinePoolScope {
public:
explicit BlockTrampolinePoolScope(Assembler* assem) : assem_(assem) {
assem_->StartBlockTrampolinePool();
}
~BlockTrampolinePoolScope() {
assem_->EndBlockTrampolinePool();
}
private:
Assembler* assem_;
DISALLOW_IMPLICIT_CONSTRUCTORS(BlockTrampolinePoolScope);
};
// Class for postponing the assembly buffer growth. Typically used for
// sequences of instructions that must be emitted as a unit, before
// buffer growth (and relocation) can occur.
// This blocking scope is not nestable.
class BlockGrowBufferScope {
public:
explicit BlockGrowBufferScope(Assembler* assem) : assem_(assem) {
assem_->StartBlockGrowBuffer();
}
~BlockGrowBufferScope() {
assem_->EndBlockGrowBuffer();
}
private:
Assembler* assem_;
DISALLOW_IMPLICIT_CONSTRUCTORS(BlockGrowBufferScope);
};
// Debugging.
// Mark address of the ExitJSFrame code.
void RecordJSReturn();
// Mark address of a debug break slot.
void RecordDebugBreakSlot();
// Record the AST id of the CallIC being compiled, so that it can be placed
// in the relocation information.
void SetRecordedAstId(TypeFeedbackId ast_id) {
DCHECK(recorded_ast_id_.IsNone());
recorded_ast_id_ = ast_id;
}
TypeFeedbackId RecordedAstId() {
DCHECK(!recorded_ast_id_.IsNone());
return recorded_ast_id_;
}
void ClearRecordedAstId() { recorded_ast_id_ = TypeFeedbackId::None(); }
// Record a comment relocation entry that can be used by a disassembler.
// Use --code-comments to enable.
void RecordComment(const char* msg);
static int RelocateInternalReference(byte* pc, intptr_t pc_delta);
// Writes a single byte or word of data in the code stream. Used for
// inline tables, e.g., jump-tables.
void db(uint8_t data);
void dd(uint32_t data);
// Emits the address of the code stub's first instruction.
void emit_code_stub_address(Code* stub);
PositionsRecorder* positions_recorder() { return &positions_recorder_; }
// Postpone the generation of the trampoline pool for the specified number of
// instructions.
void BlockTrampolinePoolFor(int instructions);
// Check if there is less than kGap bytes available in the buffer.
// If this is the case, we need to grow the buffer before emitting
// an instruction or relocation information.
inline bool overflow() const { return pc_ >= reloc_info_writer.pos() - kGap; }
// Get the number of bytes available in the buffer.
inline int available_space() const { return reloc_info_writer.pos() - pc_; }
// Read/patch instructions.
static Instr instr_at(byte* pc) { return *reinterpret_cast<Instr*>(pc); }
static void instr_at_put(byte* pc, Instr instr) {
*reinterpret_cast<Instr*>(pc) = instr;
}
Instr instr_at(int pos) { return *reinterpret_cast<Instr*>(buffer_ + pos); }
void instr_at_put(int pos, Instr instr) {
*reinterpret_cast<Instr*>(buffer_ + pos) = instr;
}
// Check if an instruction is a branch of some kind.
static bool IsBranch(Instr instr);
static bool IsBeq(Instr instr);
static bool IsBne(Instr instr);
static bool IsJump(Instr instr);
static bool IsJ(Instr instr);
static bool IsLui(Instr instr);
static bool IsOri(Instr instr);
static bool IsJal(Instr instr);
static bool IsJr(Instr instr);
static bool IsJalr(Instr instr);
static bool IsNop(Instr instr, unsigned int type);
static bool IsPop(Instr instr);
static bool IsPush(Instr instr);
static bool IsLwRegFpOffset(Instr instr);
static bool IsSwRegFpOffset(Instr instr);
static bool IsLwRegFpNegOffset(Instr instr);
static bool IsSwRegFpNegOffset(Instr instr);
static Register GetRtReg(Instr instr);
static Register GetRsReg(Instr instr);
static Register GetRdReg(Instr instr);
static uint32_t GetRt(Instr instr);
static uint32_t GetRtField(Instr instr);
static uint32_t GetRs(Instr instr);
static uint32_t GetRsField(Instr instr);
static uint32_t GetRd(Instr instr);
static uint32_t GetRdField(Instr instr);
static uint32_t GetSa(Instr instr);
static uint32_t GetSaField(Instr instr);
static uint32_t GetOpcodeField(Instr instr);
static uint32_t GetFunction(Instr instr);
static uint32_t GetFunctionField(Instr instr);
static uint32_t GetImmediate16(Instr instr);
static uint32_t GetLabelConst(Instr instr);
static int32_t GetBranchOffset(Instr instr);
static bool IsLw(Instr instr);
static int16_t GetLwOffset(Instr instr);
static Instr SetLwOffset(Instr instr, int16_t offset);
static bool IsSw(Instr instr);
static Instr SetSwOffset(Instr instr, int16_t offset);
static bool IsAddImmediate(Instr instr);
static Instr SetAddImmediateOffset(Instr instr, int16_t offset);
static bool IsAndImmediate(Instr instr);
static bool IsEmittedConstant(Instr instr);
void CheckTrampolinePool();
// Allocate a constant pool of the correct size for the generated code.
Handle<ConstantPoolArray> NewConstantPool(Isolate* isolate);
// Generate the constant pool for the generated code.
void PopulateConstantPool(ConstantPoolArray* constant_pool);
protected:
// Relocation for a type-recording IC has the AST id added to it. This
// member variable is a way to pass the information from the call site to
// the relocation info.
TypeFeedbackId recorded_ast_id_;
int32_t buffer_space() const { return reloc_info_writer.pos() - pc_; }
// Decode branch instruction at pos and return branch target pos.
int target_at(int32_t pos);
// Patch branch instruction at pos to branch to given branch target pos.
void target_at_put(int32_t pos, int32_t target_pos);
// Say if we need to relocate with this mode.
bool MustUseReg(RelocInfo::Mode rmode);
// Record reloc info for current pc_.
void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0);
// Block the emission of the trampoline pool before pc_offset.
void BlockTrampolinePoolBefore(int pc_offset) {
if (no_trampoline_pool_before_ < pc_offset)
no_trampoline_pool_before_ = pc_offset;
}
void StartBlockTrampolinePool() {
trampoline_pool_blocked_nesting_++;
}
void EndBlockTrampolinePool() {
trampoline_pool_blocked_nesting_--;
}
bool is_trampoline_pool_blocked() const {
return trampoline_pool_blocked_nesting_ > 0;
}
bool has_exception() const {
return internal_trampoline_exception_;
}
void DoubleAsTwoUInt32(double d, uint32_t* lo, uint32_t* hi);
bool is_trampoline_emitted() const {
return trampoline_emitted_;
}
// Temporarily block automatic assembly buffer growth.
void StartBlockGrowBuffer() {
DCHECK(!block_buffer_growth_);
block_buffer_growth_ = true;
}
void EndBlockGrowBuffer() {
DCHECK(block_buffer_growth_);
block_buffer_growth_ = false;
}
bool is_buffer_growth_blocked() const {
return block_buffer_growth_;
}
private:
// Buffer size and constant pool distance are checked together at regular
// intervals of kBufferCheckInterval emitted bytes.
static const int kBufferCheckInterval = 1*KB/2;
// Code generation.
// The relocation writer's position is at least kGap bytes below the end of
// the generated instructions. This is so that multi-instruction sequences do
// not have to check for overflow. The same is true for writes of large
// relocation info entries.
static const int kGap = 32;
// Repeated checking whether the trampoline pool should be emitted is rather
// expensive. By default we only check again once a number of instructions
// has been generated.
static const int kCheckConstIntervalInst = 32;
static const int kCheckConstInterval = kCheckConstIntervalInst * kInstrSize;
int next_buffer_check_; // pc offset of next buffer check.
// Emission of the trampoline pool may be blocked in some code sequences.
int trampoline_pool_blocked_nesting_; // Block emission if this is not zero.
int no_trampoline_pool_before_; // Block emission before this pc offset.
// Keep track of the last emitted pool to guarantee a maximal distance.
int last_trampoline_pool_end_; // pc offset of the end of the last pool.
// Automatic growth of the assembly buffer may be blocked for some sequences.
bool block_buffer_growth_; // Block growth when true.
// Relocation information generation.
// Each relocation is encoded as a variable size value.
static const int kMaxRelocSize = RelocInfoWriter::kMaxSize;
RelocInfoWriter reloc_info_writer;
// The bound position, before this we cannot do instruction elimination.
int last_bound_pos_;
// Code emission.
inline void CheckBuffer();
void GrowBuffer();
inline void emit(Instr x);
inline void CheckTrampolinePoolQuick();
// Instruction generation.
// We have 3 different kind of encoding layout on MIPS.
// However due to many different types of objects encoded in the same fields
// we have quite a few aliases for each mode.
// Using the same structure to refer to Register and FPURegister would spare a
// few aliases, but mixing both does not look clean to me.
// Anyway we could surely implement this differently.
void GenInstrRegister(Opcode opcode,
Register rs,
Register rt,
Register rd,
uint16_t sa = 0,
SecondaryField func = NULLSF);
void GenInstrRegister(Opcode opcode,
Register rs,
Register rt,
uint16_t msb,
uint16_t lsb,
SecondaryField func);
void GenInstrRegister(Opcode opcode,
SecondaryField fmt,
FPURegister ft,
FPURegister fs,
FPURegister fd,
SecondaryField func = NULLSF);
void GenInstrRegister(Opcode opcode,
FPURegister fr,
FPURegister ft,
FPURegister fs,
FPURegister fd,
SecondaryField func = NULLSF);
void GenInstrRegister(Opcode opcode,
SecondaryField fmt,
Register rt,
FPURegister fs,
FPURegister fd,
SecondaryField func = NULLSF);
void GenInstrRegister(Opcode opcode,
SecondaryField fmt,
Register rt,
FPUControlRegister fs,
SecondaryField func = NULLSF);
void GenInstrImmediate(Opcode opcode,
Register rs,
Register rt,
int32_t j);
void GenInstrImmediate(Opcode opcode,
Register rs,
SecondaryField SF,
int32_t j);
void GenInstrImmediate(Opcode opcode,
Register r1,
FPURegister r2,
int32_t j);
void GenInstrJump(Opcode opcode,
uint32_t address);
// Helpers.
void LoadRegPlusOffsetToAt(const MemOperand& src);
// Labels.
void print(Label* L);
void bind_to(Label* L, int pos);
void next(Label* L);
// One trampoline consists of:
// - space for trampoline slots,
// - space for labels.
//
// Space for trampoline slots is equal to slot_count * 2 * kInstrSize.
// Space for trampoline slots preceeds space for labels. Each label is of one
// instruction size, so total amount for labels is equal to
// label_count * kInstrSize.
class Trampoline {
public:
Trampoline() {
start_ = 0;
next_slot_ = 0;
free_slot_count_ = 0;
end_ = 0;
}
Trampoline(int start, int slot_count) {
start_ = start;
next_slot_ = start;
free_slot_count_ = slot_count;
end_ = start + slot_count * kTrampolineSlotsSize;
}
int start() {
return start_;
}
int end() {
return end_;
}
int take_slot() {
int trampoline_slot = kInvalidSlotPos;
if (free_slot_count_ <= 0) {
// We have run out of space on trampolines.
// Make sure we fail in debug mode, so we become aware of each case
// when this happens.
DCHECK(0);
// Internal exception will be caught.
} else {
trampoline_slot = next_slot_;
free_slot_count_--;
next_slot_ += kTrampolineSlotsSize;
}
return trampoline_slot;
}
private:
int start_;
int end_;
int next_slot_;
int free_slot_count_;
};
int32_t get_trampoline_entry(int32_t pos);
int unbound_labels_count_;
// If trampoline is emitted, generated code is becoming large. As this is
// already a slow case which can possibly break our code generation for the
// extreme case, we use this information to trigger different mode of
// branch instruction generation, where we use jump instructions rather
// than regular branch instructions.
bool trampoline_emitted_;
static const int kTrampolineSlotsSize = 4 * kInstrSize;
static const int kMaxBranchOffset = (1 << (18 - 1)) - 1;
static const int kInvalidSlotPos = -1;
Trampoline trampoline_;
bool internal_trampoline_exception_;
friend class RegExpMacroAssemblerMIPS;
friend class RelocInfo;
friend class CodePatcher;
friend class BlockTrampolinePoolScope;
PositionsRecorder positions_recorder_;
friend class PositionsRecorder;
friend class EnsureSpace;
};
class EnsureSpace BASE_EMBEDDED {
public:
explicit EnsureSpace(Assembler* assembler) {
assembler->CheckBuffer();
}
};
} } // namespace v8::internal
#endif // V8_ARM_ASSEMBLER_MIPS_H_