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