7d933936d3
This change fixes a bug with the arguments object that occurred with r4087 and r4088. The fix is not marking the arguments variable as trivial since it can have side effects. Review URL: http://codereview.chromium.org/851002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4099 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
131 lines
4.2 KiB
C++
131 lines
4.2 KiB
C++
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_VIRTUAL_FRAME_INL_H_
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#define V8_VIRTUAL_FRAME_INL_H_
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#include "virtual-frame.h"
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namespace v8 {
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namespace internal {
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// On entry to a function, the virtual frame already contains the receiver,
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// the parameters, and a return address. All frame elements are in memory.
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VirtualFrame::VirtualFrame()
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: elements_(parameter_count() + local_count() + kPreallocatedElements),
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stack_pointer_(parameter_count() + 1) { // 0-based index of TOS.
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for (int i = 0; i <= stack_pointer_; i++) {
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elements_.Add(FrameElement::MemoryElement(NumberInfo::Unknown()));
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}
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for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
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register_locations_[i] = kIllegalIndex;
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}
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}
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// When cloned, a frame is a deep copy of the original.
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VirtualFrame::VirtualFrame(VirtualFrame* original)
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: elements_(original->element_count()),
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stack_pointer_(original->stack_pointer_) {
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elements_.AddAll(original->elements_);
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// Copy register locations from original.
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memcpy(®ister_locations_,
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original->register_locations_,
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sizeof(register_locations_));
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}
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void VirtualFrame::PushFrameSlotAt(int index) {
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elements_.Add(CopyElementAt(index));
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}
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void VirtualFrame::Push(Register reg, NumberInfo info) {
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if (is_used(reg)) {
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int index = register_location(reg);
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FrameElement element = CopyElementAt(index, info);
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elements_.Add(element);
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} else {
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Use(reg, element_count());
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FrameElement element =
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FrameElement::RegisterElement(reg, FrameElement::NOT_SYNCED, info);
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elements_.Add(element);
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}
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}
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void VirtualFrame::Push(Handle<Object> value) {
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FrameElement element =
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FrameElement::ConstantElement(value, FrameElement::NOT_SYNCED);
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elements_.Add(element);
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}
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void VirtualFrame::Push(Smi* value) {
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Push(Handle<Object> (value));
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}
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void VirtualFrame::Nip(int num_dropped) {
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ASSERT(num_dropped >= 0);
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if (num_dropped == 0) return;
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Result tos = Pop();
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if (num_dropped > 1) {
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Drop(num_dropped - 1);
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}
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SetElementAt(0, &tos);
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}
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bool VirtualFrame::Equals(VirtualFrame* other) {
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#ifdef DEBUG
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for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
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if (register_location(i) != other->register_location(i)) {
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return false;
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}
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}
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if (element_count() != other->element_count()) return false;
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#endif
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if (stack_pointer_ != other->stack_pointer_) return false;
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for (int i = 0; i < element_count(); i++) {
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if (!elements_[i].Equals(other->elements_[i])) return false;
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}
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return true;
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}
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void VirtualFrame::SetTypeForLocalAt(int index, NumberInfo info) {
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elements_[local0_index() + index].set_number_info(info);
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}
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} } // namespace v8::internal
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#endif // V8_VIRTUAL_FRAME_INL_H_
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