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Side by Side Diff: src/x64/code-stubs-x64.cc

Issue 2031493002: Revert of Provide a tagged allocation top pointer. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 6 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved. 1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #if V8_TARGET_ARCH_X64 5 #if V8_TARGET_ARCH_X64
6 6
7 #include "src/code-stubs.h" 7 #include "src/code-stubs.h"
8 #include "src/api-arguments.h" 8 #include "src/api-arguments.h"
9 #include "src/bootstrapper.h" 9 #include "src/bootstrapper.h"
10 #include "src/codegen.h" 10 #include "src/codegen.h"
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4301 // Fall back to runtime if the target differs from the new target's 4301 // Fall back to runtime if the target differs from the new target's
4302 // initial map constructor. 4302 // initial map constructor.
4303 __ cmpp(rdi, FieldOperand(rcx, Map::kConstructorOrBackPointerOffset)); 4303 __ cmpp(rdi, FieldOperand(rcx, Map::kConstructorOrBackPointerOffset));
4304 __ j(not_equal, &new_object); 4304 __ j(not_equal, &new_object);
4305 4305
4306 // Allocate the JSObject on the heap. 4306 // Allocate the JSObject on the heap.
4307 Label allocate, done_allocate; 4307 Label allocate, done_allocate;
4308 __ movzxbl(rbx, FieldOperand(rcx, Map::kInstanceSizeOffset)); 4308 __ movzxbl(rbx, FieldOperand(rcx, Map::kInstanceSizeOffset));
4309 __ leal(rbx, Operand(rbx, times_pointer_size, 0)); 4309 __ leal(rbx, Operand(rbx, times_pointer_size, 0));
4310 __ Allocate(rbx, rax, rdi, no_reg, &allocate, NO_ALLOCATION_FLAGS); 4310 __ Allocate(rbx, rax, rdi, no_reg, &allocate, NO_ALLOCATION_FLAGS);
4311 __ decp(rdi); // Untag result end.
4312 __ bind(&done_allocate); 4311 __ bind(&done_allocate);
4313 4312
4314 // Initialize the JSObject fields. 4313 // Initialize the JSObject fields.
4315 __ movp(FieldOperand(rax, JSObject::kMapOffset), rcx); 4314 __ movp(FieldOperand(rax, JSObject::kMapOffset), rcx);
4316 __ LoadRoot(rbx, Heap::kEmptyFixedArrayRootIndex); 4315 __ LoadRoot(rbx, Heap::kEmptyFixedArrayRootIndex);
4317 __ movp(FieldOperand(rax, JSObject::kPropertiesOffset), rbx); 4316 __ movp(FieldOperand(rax, JSObject::kPropertiesOffset), rbx);
4318 __ movp(FieldOperand(rax, JSObject::kElementsOffset), rbx); 4317 __ movp(FieldOperand(rax, JSObject::kElementsOffset), rbx);
4319 STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize); 4318 STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize);
4320 __ leap(rbx, FieldOperand(rax, JSObject::kHeaderSize)); 4319 __ leap(rbx, FieldOperand(rax, JSObject::kHeaderSize));
4321 4320
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4450 __ bind(&no_rest_parameters); 4449 __ bind(&no_rest_parameters);
4451 { 4450 {
4452 // ----------- S t a t e ------------- 4451 // ----------- S t a t e -------------
4453 // -- rsi : context 4452 // -- rsi : context
4454 // -- rsp[0] : return address 4453 // -- rsp[0] : return address
4455 // ----------------------------------- 4454 // -----------------------------------
4456 4455
4457 // Allocate an empty rest parameter array. 4456 // Allocate an empty rest parameter array.
4458 Label allocate, done_allocate; 4457 Label allocate, done_allocate;
4459 __ Allocate(JSArray::kSize, rax, rdx, rcx, &allocate, NO_ALLOCATION_FLAGS); 4458 __ Allocate(JSArray::kSize, rax, rdx, rcx, &allocate, NO_ALLOCATION_FLAGS);
4460 __ decp(rdx); // Untag result end.
4461 __ bind(&done_allocate); 4459 __ bind(&done_allocate);
4462 4460
4463 // Setup the rest parameter array in rax. 4461 // Setup the rest parameter array in rax.
4464 __ LoadNativeContextSlot(Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, rcx); 4462 __ LoadNativeContextSlot(Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, rcx);
4465 __ movp(FieldOperand(rax, JSArray::kMapOffset), rcx); 4463 __ movp(FieldOperand(rax, JSArray::kMapOffset), rcx);
4466 __ LoadRoot(rcx, Heap::kEmptyFixedArrayRootIndex); 4464 __ LoadRoot(rcx, Heap::kEmptyFixedArrayRootIndex);
4467 __ movp(FieldOperand(rax, JSArray::kPropertiesOffset), rcx); 4465 __ movp(FieldOperand(rax, JSArray::kPropertiesOffset), rcx);
4468 __ movp(FieldOperand(rax, JSArray::kElementsOffset), rcx); 4466 __ movp(FieldOperand(rax, JSArray::kElementsOffset), rcx);
4469 __ movp(FieldOperand(rax, JSArray::kLengthOffset), Immediate(0)); 4467 __ movp(FieldOperand(rax, JSArray::kLengthOffset), Immediate(0));
4470 STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize); 4468 STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
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5445 kStackUnwindSpace, nullptr, return_value_operand, 5443 kStackUnwindSpace, nullptr, return_value_operand,
5446 NULL); 5444 NULL);
5447 } 5445 }
5448 5446
5449 #undef __ 5447 #undef __
5450 5448
5451 } // namespace internal 5449 } // namespace internal
5452 } // namespace v8 5450 } // namespace v8
5453 5451
5454 #endif // V8_TARGET_ARCH_X64 5452 #endif // V8_TARGET_ARCH_X64
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