mirror of
https://github.com/classilla/tenfourfox.git
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194 lines
6.1 KiB
C++
194 lines
6.1 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 js_ProfilingFrameIterator_h
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#define js_ProfilingFrameIterator_h
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#include "mozilla/Alignment.h"
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#include "mozilla/Maybe.h"
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#include "jsbytecode.h"
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#include "js/TypeDecls.h"
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#include "js/Utility.h"
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struct JSRuntime;
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class JSScript;
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namespace js {
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class Activation;
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class AsmJSProfilingFrameIterator;
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namespace jit {
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class JitActivation;
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class JitProfilingFrameIterator;
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class JitcodeGlobalEntry;
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} // namespace jit
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} // namespace js
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namespace JS {
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struct ForEachTrackedOptimizationAttemptOp;
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struct ForEachTrackedOptimizationTypeInfoOp;
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// This iterator can be used to walk the stack of a thread suspended at an
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// arbitrary pc. To provide acurate results, profiling must have been enabled
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// (via EnableRuntimeProfilingStack) before executing the callstack being
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// unwound.
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class JS_PUBLIC_API(ProfilingFrameIterator)
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{
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JSRuntime* rt_;
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uint32_t sampleBufferGen_;
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js::Activation* activation_;
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// When moving past a JitActivation, we need to save the prevJitTop
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// from it to use as the exit-frame pointer when the next caller jit
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// activation (if any) comes around.
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void* savedPrevJitTop_;
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static const unsigned StorageSpace = 8 * sizeof(void*);
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mozilla::AlignedStorage<StorageSpace> storage_;
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js::AsmJSProfilingFrameIterator& asmJSIter() {
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MOZ_ASSERT(!done());
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MOZ_ASSERT(isAsmJS());
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return *reinterpret_cast<js::AsmJSProfilingFrameIterator*>(storage_.addr());
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}
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const js::AsmJSProfilingFrameIterator& asmJSIter() const {
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MOZ_ASSERT(!done());
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MOZ_ASSERT(isAsmJS());
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return *reinterpret_cast<const js::AsmJSProfilingFrameIterator*>(storage_.addr());
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}
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js::jit::JitProfilingFrameIterator& jitIter() {
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MOZ_ASSERT(!done());
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MOZ_ASSERT(isJit());
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return *reinterpret_cast<js::jit::JitProfilingFrameIterator*>(storage_.addr());
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}
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const js::jit::JitProfilingFrameIterator& jitIter() const {
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MOZ_ASSERT(!done());
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MOZ_ASSERT(isJit());
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return *reinterpret_cast<const js::jit::JitProfilingFrameIterator*>(storage_.addr());
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}
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void settle();
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bool hasSampleBufferGen() const {
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return sampleBufferGen_ != UINT32_MAX;
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}
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public:
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struct RegisterState
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{
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RegisterState() : pc(nullptr), sp(nullptr), lr(nullptr) {}
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void* pc;
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void* sp;
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void* lr;
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};
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ProfilingFrameIterator(JSRuntime* rt, const RegisterState& state,
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uint32_t sampleBufferGen = UINT32_MAX);
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~ProfilingFrameIterator();
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void operator++();
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bool done() const { return !activation_; }
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// Assuming the stack grows down (we do), the return value:
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// - always points into the stack
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// - is weakly monotonically increasing (may be equal for successive frames)
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// - will compare greater than newer native and psuedo-stack frame addresses
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// and less than older native and psuedo-stack frame addresses
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void* stackAddress() const;
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enum FrameKind
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{
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Frame_Baseline,
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Frame_Ion,
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Frame_AsmJS
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};
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struct Frame
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{
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FrameKind kind;
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void* stackAddress;
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void* returnAddress;
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void* activation;
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const char* label;
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};
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bool isAsmJS() const;
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bool isJit() const;
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uint32_t extractStack(Frame* frames, uint32_t offset, uint32_t end) const;
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mozilla::Maybe<Frame> getPhysicalFrameWithoutLabel() const;
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private:
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mozilla::Maybe<Frame> getPhysicalFrameAndEntry(js::jit::JitcodeGlobalEntry* entry) const;
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void iteratorConstruct(const RegisterState& state);
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void iteratorConstruct();
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void iteratorDestroy();
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bool iteratorDone();
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};
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JS_FRIEND_API(bool)
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IsProfilingEnabledForRuntime(JSRuntime* runtime);
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/**
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* After each sample run, this method should be called with the latest sample
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* buffer generation, and the lapCount. It will update corresponding fields on
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* JSRuntime.
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*
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* See fields |profilerSampleBufferGen|, |profilerSampleBufferLapCount| on
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* JSRuntime for documentation about what these values are used for.
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*/
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JS_FRIEND_API(void)
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UpdateJSRuntimeProfilerSampleBufferGen(JSRuntime* runtime, uint32_t generation,
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uint32_t lapCount);
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struct ForEachProfiledFrameOp
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{
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// A handle to the underlying JitcodeGlobalEntry, so as to avoid repeated
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// lookups on JitcodeGlobalTable.
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class MOZ_STACK_CLASS FrameHandle
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{
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friend JS_PUBLIC_API(void) ForEachProfiledFrame(JSRuntime* rt, void* addr,
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ForEachProfiledFrameOp& op);
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JSRuntime* rt_;
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js::jit::JitcodeGlobalEntry& entry_;
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void* addr_;
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void* canonicalAddr_;
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const char* label_;
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uint32_t depth_;
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mozilla::Maybe<uint8_t> optsIndex_;
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FrameHandle(JSRuntime* rt, js::jit::JitcodeGlobalEntry& entry, void* addr,
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const char* label, uint32_t depth);
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void updateHasTrackedOptimizations();
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public:
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const char* label() const { return label_; }
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uint32_t depth() const { return depth_; }
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bool hasTrackedOptimizations() const { return optsIndex_.isSome(); }
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void* canonicalAddress() const { return canonicalAddr_; }
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ProfilingFrameIterator::FrameKind frameKind() const;
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void forEachOptimizationAttempt(ForEachTrackedOptimizationAttemptOp& op,
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JSScript** scriptOut, jsbytecode** pcOut) const;
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void forEachOptimizationTypeInfo(ForEachTrackedOptimizationTypeInfoOp& op) const;
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};
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// Called once per frame.
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virtual void operator()(const FrameHandle& frame) = 0;
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};
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JS_PUBLIC_API(void)
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ForEachProfiledFrame(JSRuntime* rt, void* addr, ForEachProfiledFrameOp& op);
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} // namespace JS
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#endif /* js_ProfilingFrameIterator_h */
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