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79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jit_BytecodeAnalysis_h
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#define jit_BytecodeAnalysis_h
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#include "jsscript.h"
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#include "jit/JitAllocPolicy.h"
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#include "js/Vector.h"
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namespace js {
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namespace jit {
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// Basic information about bytecodes in the script. Used to help baseline compilation.
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struct BytecodeInfo
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{
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static const uint16_t MAX_STACK_DEPTH = 0xffffU;
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uint16_t stackDepth;
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bool initialized : 1;
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bool jumpTarget : 1;
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// If true, this is a JSOP_LOOPENTRY op inside a catch or finally block.
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bool loopEntryInCatchOrFinally : 1;
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void init(unsigned depth) {
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MOZ_ASSERT(depth <= MAX_STACK_DEPTH);
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MOZ_ASSERT_IF(initialized, stackDepth == depth);
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initialized = true;
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stackDepth = depth;
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}
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};
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class BytecodeAnalysis
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{
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JSScript* script_;
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Vector<BytecodeInfo, 0, JitAllocPolicy> infos_;
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bool usesScopeChain_;
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bool hasTryFinally_;
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bool hasSetArg_;
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public:
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explicit BytecodeAnalysis(TempAllocator& alloc, JSScript* script);
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bool init(TempAllocator& alloc, GSNCache& gsn);
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BytecodeInfo& info(jsbytecode* pc) {
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MOZ_ASSERT(infos_[script_->pcToOffset(pc)].initialized);
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return infos_[script_->pcToOffset(pc)];
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}
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BytecodeInfo* maybeInfo(jsbytecode* pc) {
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if (infos_[script_->pcToOffset(pc)].initialized)
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return &infos_[script_->pcToOffset(pc)];
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return nullptr;
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}
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bool usesScopeChain() const {
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return usesScopeChain_;
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}
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bool hasTryFinally() const {
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return hasTryFinally_;
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}
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bool hasSetArg() const {
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return hasSetArg_;
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}
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};
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} // namespace jit
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} // namespace js
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#endif /* jit_BytecodeAnalysis_h */
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