1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit/BytecodeAnalysis.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,80 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jit_BytecodeAnalysis_h
1.11 +#define jit_BytecodeAnalysis_h
1.12 +
1.13 +#include "jsscript.h"
1.14 +#include "jit/IonAllocPolicy.h"
1.15 +#include "js/Vector.h"
1.16 +
1.17 +namespace js {
1.18 +namespace jit {
1.19 +
1.20 +// Basic information about bytecodes in the script. Used to help baseline compilation.
1.21 +struct BytecodeInfo
1.22 +{
1.23 + static const uint16_t MAX_STACK_DEPTH = 0xffffU;
1.24 + uint16_t stackDepth;
1.25 + bool initialized : 1;
1.26 + bool jumpTarget : 1;
1.27 + bool jumpFallthrough : 1;
1.28 + bool fallthrough : 1;
1.29 +
1.30 + // If true, this is a JSOP_LOOPENTRY op inside a catch or finally block.
1.31 + bool loopEntryInCatchOrFinally : 1;
1.32 +
1.33 + void init(unsigned depth) {
1.34 + JS_ASSERT(depth <= MAX_STACK_DEPTH);
1.35 + JS_ASSERT_IF(initialized, stackDepth == depth);
1.36 + initialized = true;
1.37 + stackDepth = depth;
1.38 + }
1.39 +};
1.40 +
1.41 +class BytecodeAnalysis
1.42 +{
1.43 + JSScript *script_;
1.44 + Vector<BytecodeInfo, 0, IonAllocPolicy> infos_;
1.45 +
1.46 + bool usesScopeChain_;
1.47 + bool hasTryFinally_;
1.48 + bool hasSetArg_;
1.49 +
1.50 + public:
1.51 + explicit BytecodeAnalysis(TempAllocator &alloc, JSScript *script);
1.52 +
1.53 + bool init(TempAllocator &alloc, GSNCache &gsn);
1.54 +
1.55 + BytecodeInfo &info(jsbytecode *pc) {
1.56 + JS_ASSERT(infos_[script_->pcToOffset(pc)].initialized);
1.57 + return infos_[script_->pcToOffset(pc)];
1.58 + }
1.59 +
1.60 + BytecodeInfo *maybeInfo(jsbytecode *pc) {
1.61 + if (infos_[script_->pcToOffset(pc)].initialized)
1.62 + return &infos_[script_->pcToOffset(pc)];
1.63 + return nullptr;
1.64 + }
1.65 +
1.66 + bool usesScopeChain() const {
1.67 + return usesScopeChain_;
1.68 + }
1.69 +
1.70 + bool hasTryFinally() const {
1.71 + return hasTryFinally_;
1.72 + }
1.73 +
1.74 + bool hasSetArg() const {
1.75 + return hasSetArg_;
1.76 + }
1.77 +};
1.78 +
1.79 +
1.80 +} // namespace jit
1.81 +} // namespace js
1.82 +
1.83 +#endif /* jit_BytecodeAnalysis_h */
