iposva@google.com
346424b9b0
- Make use of the field when available to avoid accessing the class. Review URL: http://codereview.chromium.org//9072011 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@2936 260f80e4-7a28-3924-810f-c04153c831b5
66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(TARGET_ARCH_X64)
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#include "vm/assembler_macros.h"
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#include "vm/assembler.h"
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namespace dart {
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DECLARE_FLAG(bool, inline_alloc);
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#define __ assembler->
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// Static.
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void AssemblerMacros::TryAllocate(Assembler* assembler,
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const Class& cls,
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Register class_reg,
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Label* failure,
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Register instance_reg) {
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#if defined(DEBUG)
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__ Untested("AssemblerMacros::TryAllocate");
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Label ok;
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__ LoadObject(instance_reg, cls);
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__ cmpq(instance_reg, class_reg);
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__ j(EQUAL, &ok, Assembler::kNearJump);
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__ Stop("AssemblerMacros::TryAllocate, wrong arguments");
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__ Bind(&ok);
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#endif
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ASSERT(failure != NULL);
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ASSERT(class_reg != instance_reg);
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if (FLAG_inline_alloc) {
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Heap* heap = Isolate::Current()->heap();
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const intptr_t instance_size = cls.instance_size();
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__ movq(TMP, Immediate(heap->TopAddress()));
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__ movq(instance_reg, Address(TMP, 0));
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__ addq(instance_reg, Immediate(instance_size));
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// instance_reg: potential next object start.
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__ movq(TMP, Immediate(heap->EndAddress()));
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__ cmpq(instance_reg, Address(TMP, 0));
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__ j(ABOVE_EQUAL, failure, Assembler::kNearJump);
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// Successfully allocated the object, now update top to point to
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// next object start and store the class in the class field of object.
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__ movq(TMP, Immediate(heap->TopAddress()));
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__ movq(Address(TMP, 0), instance_reg);
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ASSERT(instance_size >= kHeapObjectTag);
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__ subq(instance_reg, Immediate(instance_size - kHeapObjectTag));
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__ StoreIntoObject(instance_reg,
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FieldAddress(instance_reg, Instance::class_offset()),
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class_reg);
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__ movq(FieldAddress(instance_reg, Object::tags_offset()),
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Immediate(RawObject::SizeTag::encode(instance_size)));
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} else {
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__ jmp(failure);
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}
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}
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#undef __
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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