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Diffstat (limited to 'Source/JavaScriptCore/bytecode/SamplingTool.h')
| -rw-r--r-- | Source/JavaScriptCore/bytecode/SamplingTool.h | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/bytecode/SamplingTool.h b/Source/JavaScriptCore/bytecode/SamplingTool.h new file mode 100644 index 000000000..b69ef026e --- /dev/null +++ b/Source/JavaScriptCore/bytecode/SamplingTool.h @@ -0,0 +1,363 @@ +/* + * Copyright (C) 2008 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of + * its contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef SamplingTool_h +#define SamplingTool_h + +#include "Strong.h" +#include "Nodes.h" +#include "Opcode.h" +#include "SamplingCounter.h" +#include <wtf/Assertions.h> +#include <wtf/Atomics.h> +#include <wtf/HashMap.h> +#include <wtf/MainThread.h> +#include <wtf/Threading.h> + +namespace JSC { + + class ScriptExecutable; + + class SamplingFlags { + public: + static void start(); + static void stop(); + +#if ENABLE(SAMPLING_FLAGS) + static void setFlag(unsigned flag) + { + ASSERT(flag >= 1); + ASSERT(flag <= 32); + s_flags |= 1u << (flag - 1); + } + + static void clearFlag(unsigned flag) + { + ASSERT(flag >= 1); + ASSERT(flag <= 32); + s_flags &= ~(1u << (flag - 1)); + } + + static void sample(); + + class ScopedFlag { + public: + ScopedFlag(int flag) + : m_flag(flag) + { + setFlag(flag); + } + + ~ScopedFlag() + { + clearFlag(m_flag); + } + + private: + int m_flag; + }; + + static const void* addressOfFlags() + { + return &s_flags; + } + +#endif + private: + static uint32_t s_flags; +#if ENABLE(SAMPLING_FLAGS) + static uint64_t s_flagCounts[33]; +#endif + }; + +#if ENABLE(SAMPLING_REGIONS) + class SamplingRegion { + public: + // Create a scoped sampling region using a C string constant name that describes + // what you are doing. This must be a string constant that persists for the + // lifetime of the process and is immutable. + SamplingRegion(const char* name) + { + if (!isMainThread()) { + m_name = 0; + return; + } + + m_name = name; + exchangeCurrent(this, &m_previous); + ASSERT(!m_previous || m_previous > this); + } + + ~SamplingRegion() + { + if (!m_name) + return; + + ASSERT(bitwise_cast<SamplingRegion*>(s_currentOrReserved & ~1) == this); + exchangeCurrent(m_previous); + } + + static void sample(); + + static void dump(); + + private: + const char* m_name; + SamplingRegion* m_previous; + + static void exchangeCurrent(SamplingRegion* current, SamplingRegion** previousPtr = 0) + { + uintptr_t previous; + while (true) { + previous = s_currentOrReserved; + + // If it's reserved (i.e. sampling thread is reading it), loop around. + if (previous & 1) { +#if OS(UNIX) + sched_yield(); +#endif + continue; + } + + // If we're going to CAS, then make sure previous is set. + if (previousPtr) + *previousPtr = bitwise_cast<SamplingRegion*>(previous); + + if (WTF::weakCompareAndSwap(&s_currentOrReserved, previous, bitwise_cast<uintptr_t>(current))) + break; + } + } + + static void dumpInternal(); + + class Locker { + public: + Locker(); + ~Locker(); + }; + + static volatile uintptr_t s_currentOrReserved; + + // rely on identity hashing of string constants + static Spectrum<const char*>* s_spectrum; + + static unsigned long s_noneOfTheAbove; + + static unsigned s_numberOfSamplesSinceDump; + }; +#else // ENABLE(SAMPLING_REGIONS) + class SamplingRegion { + public: + SamplingRegion(const char*) { } + void dump(); + }; +#endif // ENABLE(SAMPLING_REGIONS) + + class CodeBlock; + class ExecState; + class Interpreter; + class ScopeNode; + struct Instruction; + + struct ScriptSampleRecord { + ScriptSampleRecord(JSGlobalData& globalData, ScriptExecutable* executable) + : m_executable(globalData, executable) + , m_codeBlock(0) + , m_sampleCount(0) + , m_opcodeSampleCount(0) + , m_samples(0) + , m_size(0) + { + } + + ~ScriptSampleRecord() + { + if (m_samples) + free(m_samples); + } + + void sample(CodeBlock*, Instruction*); + + Strong<ScriptExecutable> m_executable; + CodeBlock* m_codeBlock; + int m_sampleCount; + int m_opcodeSampleCount; + int* m_samples; + unsigned m_size; + }; + + typedef HashMap<ScriptExecutable*, OwnPtr<ScriptSampleRecord> > ScriptSampleRecordMap; + + class SamplingThread { + public: + // Sampling thread state. + static bool s_running; + static unsigned s_hertz; + static ThreadIdentifier s_samplingThread; + + static void start(unsigned hertz=10000); + static void stop(); + + static void* threadStartFunc(void*); + }; + + class SamplingTool { + public: + friend struct CallRecord; + friend class HostCallRecord; + +#if ENABLE(OPCODE_SAMPLING) + class CallRecord { + WTF_MAKE_NONCOPYABLE(CallRecord); + public: + CallRecord(SamplingTool* samplingTool) + : m_samplingTool(samplingTool) + , m_savedSample(samplingTool->m_sample) + , m_savedCodeBlock(samplingTool->m_codeBlock) + { + } + + ~CallRecord() + { + m_samplingTool->m_sample = m_savedSample; + m_samplingTool->m_codeBlock = m_savedCodeBlock; + } + + private: + SamplingTool* m_samplingTool; + intptr_t m_savedSample; + CodeBlock* m_savedCodeBlock; + }; + + class HostCallRecord : public CallRecord { + public: + HostCallRecord(SamplingTool* samplingTool) + : CallRecord(samplingTool) + { + samplingTool->m_sample |= 0x1; + } + }; +#else + class CallRecord { + WTF_MAKE_NONCOPYABLE(CallRecord); + public: + CallRecord(SamplingTool*) + { + } + }; + + class HostCallRecord : public CallRecord { + public: + HostCallRecord(SamplingTool* samplingTool) + : CallRecord(samplingTool) + { + } + }; +#endif + + SamplingTool(Interpreter* interpreter) + : m_interpreter(interpreter) + , m_codeBlock(0) + , m_sample(0) + , m_sampleCount(0) + , m_opcodeSampleCount(0) +#if ENABLE(CODEBLOCK_SAMPLING) + , m_scopeSampleMap(adoptPtr(new ScriptSampleRecordMap)) +#endif + { + memset(m_opcodeSamples, 0, sizeof(m_opcodeSamples)); + memset(m_opcodeSamplesInCTIFunctions, 0, sizeof(m_opcodeSamplesInCTIFunctions)); + } + + void setup(); + void dump(ExecState*); + + void notifyOfScope(JSGlobalData&, ScriptExecutable* scope); + + void sample(CodeBlock* codeBlock, Instruction* vPC) + { + ASSERT(!(reinterpret_cast<intptr_t>(vPC) & 0x3)); + m_codeBlock = codeBlock; + m_sample = reinterpret_cast<intptr_t>(vPC); + } + + CodeBlock** codeBlockSlot() { return &m_codeBlock; } + intptr_t* sampleSlot() { return &m_sample; } + + void* encodeSample(Instruction* vPC, bool inCTIFunction = false, bool inHostFunction = false) + { + ASSERT(!(reinterpret_cast<intptr_t>(vPC) & 0x3)); + return reinterpret_cast<void*>(reinterpret_cast<intptr_t>(vPC) | (static_cast<intptr_t>(inCTIFunction) << 1) | static_cast<intptr_t>(inHostFunction)); + } + + static void sample(); + + private: + class Sample { + public: + Sample(volatile intptr_t sample, CodeBlock* volatile codeBlock) + : m_sample(sample) + , m_codeBlock(codeBlock) + { + } + + bool isNull() { return !m_sample; } + CodeBlock* codeBlock() { return m_codeBlock; } + Instruction* vPC() { return reinterpret_cast<Instruction*>(m_sample & ~0x3); } + bool inHostFunction() { return m_sample & 0x1; } + bool inCTIFunction() { return m_sample & 0x2; } + + private: + intptr_t m_sample; + CodeBlock* m_codeBlock; + }; + + void doRun(); + static SamplingTool* s_samplingTool; + + Interpreter* m_interpreter; + + // State tracked by the main thread, used by the sampling thread. + CodeBlock* m_codeBlock; + intptr_t m_sample; + + // Gathered sample data. + long long m_sampleCount; + long long m_opcodeSampleCount; + unsigned m_opcodeSamples[numOpcodeIDs]; + unsigned m_opcodeSamplesInCTIFunctions[numOpcodeIDs]; + +#if ENABLE(CODEBLOCK_SAMPLING) + Mutex m_scriptSampleMapMutex; + OwnPtr<ScriptSampleRecordMap> m_scopeSampleMap; +#endif + }; + +} // namespace JSC + +#endif // SamplingTool_h |