// Copyright 2006-2009 the V8 project authors. 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.
// * Redistributions 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 Google Inc. nor the names of its
// 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.
#include "v8.h"
#include "codegen-inl.h"
#include "debug.h"
#include "runtime.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, CFunctionId id) {
// TODO(428): Don't pass the function in a static variable.
__ mov(ip, Operand(ExternalReference::builtin_passed_function()));
__ str(r1, MemOperand(ip, 0));
// The actual argument count has already been loaded into register
// r0, but JumpToBuiltin expects r0 to contain the number of
// arguments including the receiver.
__ add(r0, r0, Operand(1));
__ JumpToBuiltin(ExternalReference(id));
}
void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- r1 : constructor function
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Label non_function_call;
// Check that the function is not a smi.
__ tst(r1, Operand(kSmiTagMask));
__ b(eq, &non_function_call);
// Check that the function is a JSFunction.
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(ne, &non_function_call);
// Jump to the function-specific construct stub.
__ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r2, FieldMemOperand(r2, SharedFunctionInfo::kConstructStubOffset));
__ add(pc, r2, Operand(Code::kHeaderSize - kHeapObjectTag));
// r0: number of arguments
// r1: called object
__ bind(&non_function_call);
// Set expected number of arguments to zero (not changing r0).
__ mov(r2, Operand(0));
__ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
__ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// Enter a construct frame.
__ EnterConstructFrame();
// Preserve the two incoming parameters on the stack.
__ mov(r0, Operand(r0, LSL, kSmiTagSize));
__ push(r0); // Smi-tagged arguments count.
__ push(r1); // Constructor function.
// Use r7 for holding undefined which is used in several places below.
__ LoadRoot(r7, Heap::kUndefinedValueRootIndex);
// Try to allocate the object without transitioning into C code. If any of the
// preconditions is not met, the code bails out to the runtime call.
Label rt_call, allocated;
if (FLAG_inline_new) {
Label undo_allocation;
#ifdef ENABLE_DEBUGGER_SUPPORT
ExternalReference debug_step_in_fp =
ExternalReference::debug_step_in_fp_address();
__ mov(r2, Operand(debug_step_in_fp));
__ ldr(r2, MemOperand(r2));
__ tst(r2, r2);
__ b(nz, &rt_call);
#endif
// Load the initial map and verify that it is in fact a map.
// r1: constructor function
// r7: undefined
__ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
__ tst(r2, Operand(kSmiTagMask));
__ b(eq, &rt_call);
__ CompareObjectType(r2, r3, r4, MAP_TYPE);
__ b(ne, &rt_call);
// Check that the constructor is not constructing a JSFunction (see comments
// in Runtime_NewObject in runtime.cc). In which case the initial map's
// instance type would be JS_FUNCTION_TYPE.
// r1: constructor function
// r2: initial map
// r7: undefined
__ CompareInstanceType(r2, r3, JS_FUNCTION_TYPE);
__ b(eq, &rt_call);
// Now allocate the JSObject on the heap.
// r1: constructor function
// r2: initial map
// r7: undefined
__ ldrb(r3, FieldMemOperand(r2, Map::kInstanceSizeOffset));
__ AllocateObjectInNewSpace(r3, r4, r5, r6, &rt_call, NO_ALLOCATION_FLAGS);
// Allocated the JSObject, now initialize the fields. Map is set to initial
// map and properties and elements are set to empty fixed array.
// r1: constructor function
// r2: initial map
// r3: object size
// r4: JSObject (not tagged)
// r7: undefined
__ LoadRoot(r6, Heap::kEmptyFixedArrayRootIndex);
__ mov(r5, r4);
ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
__ str(r2, MemOperand(r5, kPointerSize, PostIndex));
ASSERT_EQ(1 * kPointerSize, JSObject::kPropertiesOffset);
__ str(r6, MemOperand(r5, kPointerSize, PostIndex));
ASSERT_EQ(2 * kPointerSize, JSObject::kElementsOffset);
__ str(r6, MemOperand(r5, kPointerSize, PostIndex));
// Fill all the in-object properties with undefined.
// r1: constructor function
// r2: initial map
// r3: object size (in words)
// r4: JSObject (not tagged)
// r5: First in-object property of JSObject (not tagged)
// r7: undefined
__ add(r6, r4, Operand(r3, LSL, kPointerSizeLog2)); // End of object.
ASSERT_EQ(3 * kPointerSize, JSObject::kHeaderSize);
{ Label loop, entry;
__ b(&entry);
__ bind(&loop);
__ str(r7, MemOperand(r5, kPointerSize, PostIndex));
__ bind(&entry);
__ cmp(r5, Operand(r6));
__ b(lt, &loop);
}
// Add the object tag to make the JSObject real, so that we can continue and
// jump into the continuation code at any time from now on. Any failures
// need to undo the allocation, so that the heap is in a consistent state
// and verifiable.
__ add(r4, r4, Operand(kHeapObjectTag));
// Check if a non-empty properties array is needed. Continue with allocated
// object if not fall through to runtime call if it is.
// r1: constructor function
// r4: JSObject
// r5: start of next object (not tagged)
// r7: undefined
__ ldrb(r3, FieldMemOperand(r2, Map::kUnusedPropertyFieldsOffset));
// The field instance sizes contains both pre-allocated property fields and
// in-object properties.
__ ldr(r0, FieldMemOperand(r2, Map::kInstanceSizesOffset));
__ and_(r6,
r0,
Operand(0x000000FF << Map::kPreAllocatedPropertyFieldsByte * 8));
__ add(r3, r3, Operand(r6, LSR, Map::kPreAllocatedPropertyFieldsByte * 8));
__ and_(r6, r0, Operand(0x000000FF << Map::kInObjectPropertiesByte * 8));
__ sub(r3, r3, Operand(r6, LSR, Map::kInObjectPropertiesByte * 8), SetCC);
// Done if no extra properties are to be allocated.
__ b(eq, &allocated);
__ Assert(pl, "Property allocation count failed.");
// Scale the number of elements by pointer size and add the header for
// FixedArrays to the start of the next object calculation from above.
// r1: constructor
// r3: number of elements in properties array
// r4: JSObject
// r5: start of next object
// r7: undefined
__ add(r0, r3, Operand(FixedArray::kHeaderSize / kPointerSize));
__ AllocateObjectInNewSpace(r0,
r5,
r6,
r2,
&undo_allocation,
RESULT_CONTAINS_TOP);
// Initialize the FixedArray.
// r1: constructor
// r3: number of elements in properties array
// r4: JSObject
// r5: FixedArray (not tagged)
// r7: undefined
__ LoadRoot(r6, Heap::kFixedArrayMapRootIndex);
__ mov(r2, r5);
ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
__ str(r6, MemOperand(r2, kPointerSize, PostIndex));
ASSERT_EQ(1 * kPointerSize, Array::kLengthOffset);
__ str(r3, MemOperand(r2, kPointerSize, PostIndex));
// Initialize the fields to undefined.
// r1: constructor function
// r2: First element of FixedArray (not tagged)
// r3: number of elements in properties array
// r4: JSObject
// r5: FixedArray (not tagged)
// r7: undefined
__ add(r6, r2, Operand(r3, LSL, kPointerSizeLog2)); // End of object.
ASSERT_EQ(2 * kPointerSize, FixedArray::kHeaderSize);
{ Label loop, entry;
__ b(&entry);
__ bind(&loop);
__ str(r7, MemOperand(r2, kPointerSize, PostIndex));
__ bind(&entry);
__ cmp(r2, Operand(r6));
__ b(lt, &loop);
}
// Store the initialized FixedArray into the properties field of
// the JSObject
// r1: constructor function
// r4: JSObject
// r5: FixedArray (not tagged)
__ add(r5, r5, Operand(kHeapObjectTag)); // Add the heap tag.
__ str(r5, FieldMemOperand(r4, JSObject::kPropertiesOffset));
// Continue with JSObject being successfully allocated
// r1: constructor function
// r4: JSObject
__ jmp(&allocated);
// Undo the setting of the new top so that the heap is verifiable. For
// example, the map's unused properties potentially do not match the
// allocated objects unused properties.
// r4: JSObject (previous new top)
__ bind(&undo_allocation);
__ UndoAllocationInNewSpace(r4, r5);
}
// Allocate the new receiver object using the runtime call.
// r1: constructor function
__ bind(&rt_call);
__ push(r1); // argument for Runtime_NewObject
__ CallRuntime(Runtime::kNewObject, 1);
__ mov(r4, r0);
// Receiver for constructor call allocated.
// r4: JSObject
__ bind(&allocated);
__ push(r4);
// Push the function and the allocated receiver from the stack.
// sp[0]: receiver (newly allocated object)
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ ldr(r1, MemOperand(sp, kPointerSize));
__ push(r1); // Constructor function.
__ push(r4); // Receiver.
// Reload the number of arguments from the stack.
// r1: constructor function
// sp[0]: receiver
// sp[1]: constructor function
// sp[2]: receiver
// sp[3]: constructor function
// sp[4]: number of arguments (smi-tagged)
__ ldr(r3, MemOperand(sp, 4 * kPointerSize));
// Setup pointer to last argument.
__ add(r2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
// Setup number of arguments for function call below
__ mov(r0, Operand(r3, LSR, kSmiTagSize));
// Copy arguments and receiver to the expression stack.
// r0: number of arguments
// r2: address of last argument (caller sp)
// r1: constructor function
// r3: number of arguments (smi-tagged)
// sp[0]: receiver
// sp[1]: constructor function
// sp[2]: receiver
// sp[3]: constructor function
// sp[4]: number of arguments (smi-tagged)
Label loop, entry;
__ b(&entry);
__ bind(&loop);
__ ldr(ip, MemOperand(r2, r3, LSL, kPointerSizeLog2 - 1));
__ push(ip);
__ bind(&entry);
__ sub(r3, r3, Operand(2), SetCC);
__ b(ge, &loop);
// Call the function.
// r0: number of arguments
// r1: constructor function
ParameterCount actual(r0);
__ InvokeFunction(r1, actual, CALL_FUNCTION);
// Pop the function from the stack.
// sp[0]: constructor function
// sp[2]: receiver
// sp[3]: constructor function
// sp[4]: number of arguments (smi-tagged)
__ pop();
// Restore context from the frame.
// r0: result
// sp[0]: receiver
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
// If the result is an object (in the ECMA sense), we should get rid
// of the receiver and use the result; see ECMA-262 section 13.2.2-7
// on page 74.
Label use_receiver, exit;
// If the result is a smi, it is *not* an object in the ECMA sense.
// r0: result
// sp[0]: receiver (newly allocated object)
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ tst(r0, Operand(kSmiTagMask));
__ b(eq, &use_receiver);
// If the type of the result (stored in its map) is less than
// FIRST_JS_OBJECT_TYPE, it is not an object in the ECMA sense.
__ CompareObjectType(r0, r3, r3, FIRST_JS_OBJECT_TYPE);
__ b(ge, &exit);
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ ldr(r0, MemOperand(sp));
// Remove receiver from the stack, remove caller arguments, and
// return.
__ bind(&exit);
// r0: result
// sp[0]: receiver (newly allocated object)
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ ldr(r1, MemOperand(sp, 2 * kPointerSize));
__ LeaveConstructFrame();
__ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - 1));
__ add(sp, sp, Operand(kPointerSize));
__ IncrementCounter(&Counters::constructed_objects, 1, r1, r2);
__ Jump(lr);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Called from Generate_JS_Entry
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// r4: argv
// r5-r7, cp may be clobbered
// Clear the context before we push it when entering the JS frame.
__ mov(cp, Operand(0));
// Enter an internal frame.
__ EnterInternalFrame();
// Set up the context from the function argument.
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
// Set up the roots register.
ExternalReference roots_address = ExternalReference::roots_address();
__ mov(r10, Operand(roots_address));
// Push the function and the receiver onto the stack.
__ push(r1);
__ push(r2);
// Copy arguments to the stack in a loop.
// r1: function
// r3: argc
// r4: argv, i.e. points to first arg
Label loop, entry;
__ add(r2, r4, Operand(r3, LSL, kPointerSizeLog2));
// r2 points past last arg.
__ b(&entry);
__ bind(&loop);
__ ldr(r0, MemOperand(r4, kPointerSize, PostIndex)); // read next parameter
__ ldr(r0, MemOperand(r0)); // dereference handle
__ push(r0); // push parameter
__ bind(&entry);
__ cmp(r4, Operand(r2));
__ b(ne, &loop);
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(r4, Heap::kUndefinedValueRootIndex);
__ mov(r5, Operand(r4));
__ mov(r6, Operand(r4));
__ mov(r7, Operand(r4));
if (kR9Available == 1) {
__ mov(r9, Operand(r4));
}
// Invoke the code and pass argc as r0.
__ mov(r0, Operand(r3));
if (is_construct) {
__ Call(Handle<Code>(Builtins::builtin(Builtins::JSConstructCall)),
RelocInfo::CODE_TARGET);
} else {
ParameterCount actual(r0);
__ InvokeFunction(r1, actual, CALL_FUNCTION);
}
// Exit the JS frame and remove the parameters (except function), and return.
// Respect ABI stack constraint.
__ LeaveInternalFrame();
__ Jump(lr);
// r0: result
}
void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, false);
}
void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, true);
}
void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
// 1. Make sure we have at least one argument.
// r0: actual number of argument
{ Label done;
__ tst(r0, Operand(r0));
__ b(ne, &done);
__ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
__ push(r2);
__ add(r0, r0, Operand(1));
__ bind(&done);
}
// 2. Get the function to call from the stack.
// r0: actual number of argument
{ Label done, non_function, function;
__ ldr(r1, MemOperand(sp, r0, LSL, kPointerSizeLog2));
__ tst(r1, Operand(kSmiTagMask));
__ b(eq, &non_function);
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(eq, &function);
// Non-function called: Clear the function to force exception.
__ bind(&non_function);
__ mov(r1, Operand(0));
__ b(&done);
// Change the context eagerly because it will be used below to get the
// right global object.
__ bind(&function);
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
__ bind(&done);
}
// 3. Make sure first argument is an object; convert if necessary.
// r0: actual number of arguments
// r1: function
{ Label call_to_object, use_global_receiver, patch_receiver, done;
__ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2));
__ ldr(r2, MemOperand(r2, -kPointerSize));
// r0: actual number of arguments
// r1: function
// r2: first argument
__ tst(r2, Operand(kSmiTagMask));
__ b(eq, &call_to_object);
__ LoadRoot(r3, Heap::kNullValueRootIndex);
__ cmp(r2, r3);
__ b(eq, &use_global_receiver);
__ LoadRoot(r3, Heap::kUndefinedValueRootIndex);
__ cmp(r2, r3);
__ b(eq, &use_global_receiver);
__ CompareObjectType(r2, r3, r3, FIRST_JS_OBJECT_TYPE);
__ b(lt, &call_to_object);
__ cmp(r3, Operand(LAST_JS_OBJECT_TYPE));
__ b(le, &done);
__ bind(&call_to_object);
__ EnterInternalFrame();
// Store number of arguments and function across the call into the runtime.
__ mov(r0, Operand(r0, LSL, kSmiTagSize));
__ push(r0);
__ push(r1);
__ push(r2);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_JS);
__ mov(r2, r0);
// Restore number of arguments and function.
__ pop(r1);
__ pop(r0);
__ mov(r0, Operand(r0, ASR, kSmiTagSize));
__ LeaveInternalFrame();
__ b(&patch_receiver);
// Use the global receiver object from the called function as the receiver.
__ bind(&use_global_receiver);
const int kGlobalIndex =
Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
__ ldr(r2, FieldMemOperand(cp, kGlobalIndex));
__ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalReceiverOffset));
__ bind(&patch_receiver);
__ add(r3, sp, Operand(r0, LSL, kPointerSizeLog2));
__ str(r2, MemOperand(r3, -kPointerSize));
__ bind(&done);
}
// 4. Shift stuff one slot down the stack
// r0: actual number of arguments (including call() receiver)
// r1: function
{ Label loop;
// Calculate the copy start address (destination). Copy end address is sp.
__ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2));
__ add(r2, r2, Operand(kPointerSize)); // copy receiver too
__ bind(&loop);
__ ldr(ip, MemOperand(r2, -kPointerSize));
__ str(ip, MemOperand(r2));
__ sub(r2, r2, Operand(kPointerSize));
__ cmp(r2, sp);
__ b(ne, &loop);
}
// 5. Adjust the actual number of arguments and remove the top element.
// r0: actual number of arguments (including call() receiver)
// r1: function
__ sub(r0, r0, Operand(1));
__ add(sp, sp, Operand(kPointerSize));
// 6. Get the code for the function or the non-function builtin.
// If number of expected arguments matches, then call. Otherwise restart
// the arguments adaptor stub.
// r0: actual number of arguments
// r1: function
{ Label invoke;
__ tst(r1, r1);
__ b(ne, &invoke);
__ mov(r2, Operand(0)); // expected arguments is 0 for CALL_NON_FUNCTION
__ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION);
__ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
RelocInfo::CODE_TARGET);
__ bind(&invoke);
__ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r2,
FieldMemOperand(r3,
SharedFunctionInfo::kFormalParameterCountOffset));
__ ldr(r3,
MemOperand(r3, SharedFunctionInfo::kCodeOffset - kHeapObjectTag));
__ add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
__ cmp(r2, r0); // Check formal and actual parameter counts.
__ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
RelocInfo::CODE_TARGET, ne);
// 7. Jump to the code in r3 without checking arguments.
ParameterCount expected(0);
__ InvokeCode(r3, expected, expected, JUMP_FUNCTION);
}
}
void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
const int kIndexOffset = -5 * kPointerSize;
const int kLimitOffset = -4 * kPointerSize;
const int kArgsOffset = 2 * kPointerSize;
const int kRecvOffset = 3 * kPointerSize;
const int kFunctionOffset = 4 * kPointerSize;
__ EnterInternalFrame();
__ ldr(r0, MemOperand(fp, kFunctionOffset)); // get the function
__ push(r0);
__ ldr(r0, MemOperand(fp, kArgsOffset)); // get the args array
__ push(r0);
__ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_JS);
Label no_preemption, retry_preemption;
__ bind(&retry_preemption);
ExternalReference stack_guard_limit_address =
ExternalReference::address_of_stack_guard_limit();
__ mov(r2, Operand(stack_guard_limit_address));
__ ldr(r2, MemOperand(r2));
__ cmp(sp, r2);
__ b(hi, &no_preemption);
// We have encountered a preemption or stack overflow already before we push
// the array contents. Save r0 which is the Smi-tagged length of the array.
__ push(r0);
// Runtime routines expect at least one argument, so give it a Smi.
__ mov(r0, Operand(Smi::FromInt(0)));
__ push(r0);
__ CallRuntime(Runtime::kStackGuard, 1);
// Since we returned, it wasn't a stack overflow. Restore r0 and try again.
__ pop(r0);
__ b(&retry_preemption);
__ bind(&no_preemption);
// Eagerly check for stack-overflow before starting to push the arguments.
// r0: number of arguments.
// r2: stack limit.
Label okay;
__ sub(r2, sp, r2);
__ cmp(r2, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
__ b(hi, &okay);
// Out of stack space.
__ ldr(r1, MemOperand(fp, kFunctionOffset));
__ push(r1);
__ push(r0);
__ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_JS);
// Push current limit and index.
__ bind(&okay);
__ push(r0); // limit
__ mov(r1, Operand(0)); // initial index
__ push(r1);
// Change context eagerly to get the right global object if necessary.
__ ldr(r0, MemOperand(fp, kFunctionOffset));
__ ldr(cp, FieldMemOperand(r0, JSFunction::kContextOffset));
// Compute the receiver.
Label call_to_object, use_global_receiver, push_receiver;
__ ldr(r0, MemOperand(fp, kRecvOffset));
__ tst(r0, Operand(kSmiTagMask));
__ b(eq, &call_to_object);
__ LoadRoot(r1, Heap::kNullValueRootIndex);
__ cmp(r0, r1);
__ b(eq, &use_global_receiver);
__ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
__ cmp(r0, r1);
__ b(eq, &use_global_receiver);
// Check if the receiver is already a JavaScript object.
// r0: receiver
__ CompareObjectType(r0, r1, r1, FIRST_JS_OBJECT_TYPE);
__ b(lt, &call_to_object);
__ cmp(r1, Operand(LAST_JS_OBJECT_TYPE));
__ b(le, &push_receiver);
// Convert the receiver to a regular object.
// r0: receiver
__ bind(&call_to_object);
__ push(r0);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_JS);
__ b(&push_receiver);
// Use the current global receiver object as the receiver.
__ bind(&use_global_receiver);
const int kGlobalOffset =
Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
__ ldr(r0, FieldMemOperand(cp, kGlobalOffset));
__ ldr(r0, FieldMemOperand(r0, GlobalObject::kGlobalReceiverOffset));
// Push the receiver.
// r0: receiver
__ bind(&push_receiver);
__ push(r0);
// Copy all arguments from the array to the stack.
Label entry, loop;
__ ldr(r0, MemOperand(fp, kIndexOffset));
__ b(&entry);
// Load the current argument from the arguments array and push it to the
// stack.
// r0: current argument index
__ bind(&loop);
__ ldr(r1, MemOperand(fp, kArgsOffset));
__ push(r1);
__ push(r0);
// Call the runtime to access the property in the arguments array.
__ CallRuntime(Runtime::kGetProperty, 2);
__ push(r0);
// Use inline caching to access the arguments.
__ ldr(r0, MemOperand(fp, kIndexOffset));
__ add(r0, r0, Operand(1 << kSmiTagSize));
__ str(r0, MemOperand(fp, kIndexOffset));
// Test if the copy loop has finished copying all the elements from the
// arguments object.
__ bind(&entry);
__ ldr(r1, MemOperand(fp, kLimitOffset));
__ cmp(r0, r1);
__ b(ne, &loop);
// Invoke the function.
ParameterCount actual(r0);
__ mov(r0, Operand(r0, ASR, kSmiTagSize));
__ ldr(r1, MemOperand(fp, kFunctionOffset));
__ InvokeFunction(r1, actual, CALL_FUNCTION);
// Tear down the internal frame and remove function, receiver and args.
__ LeaveInternalFrame();
__ add(sp, sp, Operand(3 * kPointerSize));
__ Jump(lr);
}
static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
__ mov(r0, Operand(r0, LSL, kSmiTagSize));
__ mov(r4, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ stm(db_w, sp, r0.bit() | r1.bit() | r4.bit() | fp.bit() | lr.bit());
__ add(fp, sp, Operand(3 * kPointerSize));
}
static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : result being passed through
// -----------------------------------
// Get the number of arguments passed (as a smi), tear down the frame and
// then tear down the parameters.
__ ldr(r1, MemOperand(fp, -3 * kPointerSize));
__ mov(sp, fp);
__ ldm(ia_w, sp, fp.bit() | lr.bit());
__ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - kSmiTagSize));
__ add(sp, sp, Operand(kPointerSize)); // adjust for receiver
}
void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : actual number of arguments
// -- r1 : function (passed through to callee)
// -- r2 : expected number of arguments
// -- r3 : code entry to call
// -----------------------------------
Label invoke, dont_adapt_arguments;
Label enough, too_few;
__ cmp(r0, Operand(r2));
__ b(lt, &too_few);
__ cmp(r2, Operand(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
__ b(eq, &dont_adapt_arguments);
{ // Enough parameters: actual >= expected
__ bind(&enough);
EnterArgumentsAdaptorFrame(masm);
// Calculate copy start address into r0 and copy end address into r2.
// r0: actual number of arguments as a smi
// r1: function
// r2: expected number of arguments
// r3: code entry to call
__ add(r0, fp, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
// adjust for return address and receiver
__ add(r0, r0, Operand(2 * kPointerSize));
__ sub(r2, r0, Operand(r2, LSL, kPointerSizeLog2));
// Copy the arguments (including the receiver) to the new stack frame.
// r0: copy start address
// r1: function
// r2: copy end address
// r3: code entry to call
Label copy;
__ bind(©);
__ ldr(ip, MemOperand(r0, 0));
__ push(ip);
__ cmp(r0, r2); // Compare before moving to next argument.
__ sub(r0, r0, Operand(kPointerSize));
__ b(ne, ©);
__ b(&invoke);
}
{ // Too few parameters: Actual < expected
__ bind(&too_few);
EnterArgumentsAdaptorFrame(masm);
// Calculate copy start address into r0 and copy end address is fp.
// r0: actual number of arguments as a smi
// r1: function
// r2: expected number of arguments
// r3: code entry to call
__ add(r0, fp, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
// Copy the arguments (including the receiver) to the new stack frame.
// r0: copy start address
// r1: function
// r2: expected number of arguments
// r3: code entry to call
Label copy;
__ bind(©);
// Adjust load for return address and receiver.
__ ldr(ip, MemOperand(r0, 2 * kPointerSize));
__ push(ip);
__ cmp(r0, fp); // Compare before moving to next argument.
__ sub(r0, r0, Operand(kPointerSize));
__ b(ne, ©);
// Fill the remaining expected arguments with undefined.
// r1: function
// r2: expected number of arguments
// r3: code entry to call
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ sub(r2, fp, Operand(r2, LSL, kPointerSizeLog2));
__ sub(r2, r2, Operand(4 * kPointerSize)); // Adjust for frame.
Label fill;
__ bind(&fill);
__ push(ip);
__ cmp(sp, r2);
__ b(ne, &fill);
}
// Call the entry point.
__ bind(&invoke);
__ Call(r3);
// Exit frame and return.
LeaveArgumentsAdaptorFrame(masm);
__ Jump(lr);
// -------------------------------------------
// Dont adapt arguments.
// -------------------------------------------
__ bind(&dont_adapt_arguments);
__ Jump(r3);
}
#undef __
} } // namespace v8::internal