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72 lines
2.3 KiB
C++
72 lines
2.3 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 <stdint.h>
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#include "js/Utility.h"
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class JSAtom;
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struct JSRuntime;
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namespace js { class AsmJSActivation; class AsmJSProfilingFrameIterator; }
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namespace JS {
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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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js::AsmJSActivation *activation_;
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static const unsigned StorageSpace = 6 * sizeof(void*);
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mozilla::AlignedStorage<StorageSpace> storage_;
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js::AsmJSProfilingFrameIterator &iter() {
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JS_ASSERT(!done());
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return *reinterpret_cast<js::AsmJSProfilingFrameIterator*>(storage_.addr());
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}
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const js::AsmJSProfilingFrameIterator &iter() const {
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JS_ASSERT(!done());
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return *reinterpret_cast<const js::AsmJSProfilingFrameIterator*>(storage_.addr());
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}
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void settle();
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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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~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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// Return a label suitable for regexp-matching as performed by
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// browser/devtools/profiler/cleopatra/js/parserWorker.js
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const char *label() const;
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};
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} // namespace JS
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#endif /* js_ProfilingFrameIterator_h */
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