/* -*- 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 */