73256b05af
Use the jump targets to move the first deferred code to not flush registers in the inlined case (KeyedLoad). Review URL: http://codereview.chromium.org/2249002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4745 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
// Copyright 2010 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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#include "v8.h"
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#include "codegen-inl.h"
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#include "jump-target-inl.h"
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namespace v8 {
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namespace internal {
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DeferredCode::DeferredCode()
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: masm_(CodeGeneratorScope::Current()->masm()),
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statement_position_(masm_->current_statement_position()),
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position_(masm_->current_position()),
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frame_state_(*CodeGeneratorScope::Current()->frame()) {
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ASSERT(statement_position_ != RelocInfo::kNoPosition);
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ASSERT(position_ != RelocInfo::kNoPosition);
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CodeGeneratorScope::Current()->AddDeferred(this);
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#ifdef DEBUG
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comment_ = "";
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#endif
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}
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// -------------------------------------------------------------------------
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// BreakTarget implementation.
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void BreakTarget::SetExpectedHeight() {
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expected_height_ = cgen()->frame()->height();
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}
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void BreakTarget::Jump() {
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ASSERT(cgen()->has_valid_frame());
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int count = cgen()->frame()->height() - expected_height_;
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if (count > 0) {
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cgen()->frame()->Drop(count);
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}
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DoJump();
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}
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void BreakTarget::Branch(Condition cc, Hint hint) {
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if (cc == al) {
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Jump();
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return;
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}
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ASSERT(cgen()->has_valid_frame());
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int count = cgen()->frame()->height() - expected_height_;
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if (count > 0) {
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// We negate and branch here rather than using DoBranch's negate
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// and branch. This gives us a hook to remove statement state
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// from the frame.
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JumpTarget fall_through;
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// Branch to fall through will not negate, because it is a
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// forward-only target.
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fall_through.Branch(NegateCondition(cc), NegateHint(hint));
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// Emit merge code.
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cgen()->frame()->Drop(count);
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DoJump();
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fall_through.Bind();
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} else {
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DoBranch(cc, hint);
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}
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}
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void BreakTarget::Bind() {
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if (cgen()->has_valid_frame()) {
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int count = cgen()->frame()->height() - expected_height_;
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if (count > 0) {
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cgen()->frame()->Drop(count);
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}
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}
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DoBind();
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}
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} } // namespace v8::internal
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