asiva@google.com
d4d781d636
and sometimes confusing values. - Remove instance_kind_ field from RawClass. - Rename all class id names to have a Cid suffix. - Remove code from object.h and object_store.h which dealt with object ids of predefined classes for snapshots. Review URL: https://chromiumcodereview.appspot.com//10827209 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10418 260f80e4-7a28-3924-810f-c04153c831b5
90 lines
2.8 KiB
C++
90 lines
2.8 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_IA32)
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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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Label* failure,
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Register instance_reg) {
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ASSERT(failure != NULL);
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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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__ movl(instance_reg, Address::Absolute(heap->TopAddress()));
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__ addl(instance_reg, Immediate(instance_size));
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// instance_reg: potential next object start.
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__ cmpl(instance_reg, Address::Absolute(heap->EndAddress()));
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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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__ movl(Address::Absolute(heap->TopAddress()), instance_reg);
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ASSERT(instance_size >= kHeapObjectTag);
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__ subl(instance_reg, Immediate(instance_size - kHeapObjectTag));
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uword tags = 0;
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tags = RawObject::SizeTag::update(instance_size, tags);
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ASSERT(cls.id() != kIllegalCid);
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tags = RawObject::ClassIdTag::update(cls.id(), tags);
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__ movl(FieldAddress(instance_reg, Object::tags_offset()), Immediate(tags));
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} else {
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__ jmp(failure);
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}
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}
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void AssemblerMacros::EnterDartFrame(Assembler* assembler,
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intptr_t frame_size) {
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const intptr_t offset = assembler->CodeSize();
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__ EnterFrame(0);
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Label dart_entry;
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__ call(&dart_entry);
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__ Bind(&dart_entry);
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// Adjust saved PC for any intrinsic code that could have been generated
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// before a frame is created.
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if (offset != 0) {
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__ addl(Address(ESP, 0), Immediate(-offset));
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}
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if (frame_size != 0) {
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__ subl(ESP, Immediate(frame_size));
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}
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}
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void AssemblerMacros::EnterDartLeafFrame(Assembler* assembler,
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intptr_t frame_size) {
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__ EnterFrame(0);
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Label dart_entry;
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// Leave room for the saved PC, it will be filled in lazily, leave
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// uninitialized.
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__ subl(ESP, Immediate(frame_size + kWordSize));
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#if defined(DEBUG)
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// Store an invalid object in saved PC slot.
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__ movl(Address(EBP, -kWordSize), Immediate(kHeapObjectTag));
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#endif
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}
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void AssemblerMacros::EnterStubFrame(Assembler* assembler) {
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__ EnterFrame(0);
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__ pushl(Immediate(0)); // Push 0 in the saved PC area for stub frames.
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}
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#undef __
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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