4a6ef3ee28
Before, when we deoptimized after a branch we jumped to before the branch was taken in the unoptimized code with a token value that indicated when edge to take. There was a lot of machinery to track this value through the short-circuit logical operations and logical negation, and to handle it properly at inline function return sites. There was also machinery to prevent incorrectly seeing this environment with the extra value never actually materialized in the unoptimized code. Instead, now we deoptimize directly to one of the targets of the branch. Much but not yet all of the extra machinery has been removed or simplified. The cost is that branching control structures (the looping statements, if statements, conditional expressions, and the short-circuit binary logical operations) need extra AST IDs to identify the branch targets. Review URL: http://codereview.chromium.org/5908001 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6049 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
108 lines
3.4 KiB
C++
108 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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#ifndef V8_AST_INL_H_
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#define V8_AST_INL_H_
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#include "v8.h"
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#include "ast.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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SwitchStatement::SwitchStatement(ZoneStringList* labels)
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: BreakableStatement(labels, TARGET_FOR_ANONYMOUS),
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tag_(NULL), cases_(NULL) {
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}
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Block::Block(ZoneStringList* labels, int capacity, bool is_initializer_block)
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: BreakableStatement(labels, TARGET_FOR_NAMED_ONLY),
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statements_(capacity),
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is_initializer_block_(is_initializer_block) {
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}
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BreakableStatement::BreakableStatement(ZoneStringList* labels, Type type)
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: labels_(labels),
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type_(type),
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entry_id_(GetNextId()),
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exit_id_(GetNextId()) {
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ASSERT(labels == NULL || labels->length() > 0);
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}
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IterationStatement::IterationStatement(ZoneStringList* labels)
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: BreakableStatement(labels, TARGET_FOR_ANONYMOUS),
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body_(NULL),
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continue_target_(JumpTarget::BIDIRECTIONAL),
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osr_entry_id_(GetNextId()) {
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}
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DoWhileStatement::DoWhileStatement(ZoneStringList* labels)
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: IterationStatement(labels),
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cond_(NULL),
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condition_position_(-1),
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continue_id_(GetNextId()),
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back_edge_id_(GetNextId()) {
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}
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WhileStatement::WhileStatement(ZoneStringList* labels)
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: IterationStatement(labels),
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cond_(NULL),
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may_have_function_literal_(true),
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body_id_(GetNextId()) {
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}
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ForStatement::ForStatement(ZoneStringList* labels)
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: IterationStatement(labels),
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init_(NULL),
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cond_(NULL),
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next_(NULL),
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may_have_function_literal_(true),
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loop_variable_(NULL),
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continue_id_(GetNextId()),
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body_id_(GetNextId()) {
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}
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ForInStatement::ForInStatement(ZoneStringList* labels)
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: IterationStatement(labels), each_(NULL), enumerable_(NULL),
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assignment_id_(GetNextId()) {
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}
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} } // namespace v8::internal
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#endif // V8_AST_INL_H_
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