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Diffstat (limited to 'src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.h')
| -rw-r--r-- | src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.h b/src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.h new file mode 100644 index 0000000..daf99d2 --- /dev/null +++ b/src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.h @@ -0,0 +1,214 @@ +/* + * 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 <wtf/Assertions.h> +#include <wtf/HashMap.h> +#include <wtf/Threading.h> + +#include "Nodes.h" +#include "Opcode.h" + +namespace JSC { + + class CodeBlock; + class ExecState; + class Interpreter; + class ScopeNode; + struct Instruction; + + struct ScopeSampleRecord { + ScopeSampleRecord(ScopeNode* scope) + : m_scope(scope) + , m_codeBlock(0) + , m_sampleCount(0) + , m_opcodeSampleCount(0) + , m_samples(0) + , m_size(0) + { + } + + ~ScopeSampleRecord() + { + if (m_samples) + free(m_samples); + } + + void sample(CodeBlock*, Instruction*); + + RefPtr<ScopeNode> m_scope; + CodeBlock* m_codeBlock; + int m_sampleCount; + int m_opcodeSampleCount; + int* m_samples; + unsigned m_size; + }; + + typedef WTF::HashMap<ScopeNode*, ScopeSampleRecord*> ScopeSampleRecordMap; + + class SamplingTool { + public: + friend class CallRecord; + friend class HostCallRecord; + +#if ENABLE(OPCODE_SAMPLING) + class CallRecord : Noncopyable { + 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 : Noncopyable { + public: + CallRecord(SamplingTool*) + { + } + }; + + class HostCallRecord : public CallRecord { + public: + HostCallRecord(SamplingTool* samplingTool) + : CallRecord(samplingTool) + { + } + }; +#endif + + SamplingTool(Interpreter* interpreter) + : m_interpreter(interpreter) + , m_running(false) + , m_codeBlock(0) + , m_sample(0) + , m_sampleCount(0) + , m_opcodeSampleCount(0) + , m_scopeSampleMap(new ScopeSampleRecordMap()) + { + memset(m_opcodeSamples, 0, sizeof(m_opcodeSamples)); + memset(m_opcodeSamplesInCTIFunctions, 0, sizeof(m_opcodeSamplesInCTIFunctions)); + } + + ~SamplingTool() + { + deleteAllValues(*m_scopeSampleMap); + } + + void start(unsigned hertz=10000); + void stop(); + void dump(ExecState*); + + void notifyOfScope(ScopeNode* 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; } + + unsigned encodeSample(Instruction* vPC, bool inCTIFunction = false, bool inHostFunction = false) + { + ASSERT(!(reinterpret_cast<intptr_t>(vPC) & 0x3)); + return reinterpret_cast<intptr_t>(vPC) | (static_cast<intptr_t>(inCTIFunction) << 1) | static_cast<intptr_t>(inHostFunction); + } + + private: + class Sample { + public: + Sample(volatile intptr_t sample, CodeBlock* volatile codeBlock) + : m_sample(sample) + , m_codeBlock(codeBlock) + { + } + + bool isNull() { return !m_sample || !m_codeBlock; } + 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; + }; + + static void* threadStartFunc(void*); + void run(); + + Interpreter* m_interpreter; + + // Sampling thread state. + bool m_running; + unsigned m_hertz; + ThreadIdentifier m_samplingThread; + + // 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]; + + Mutex m_scopeSampleMapMutex; + OwnPtr<ScopeSampleRecordMap> m_scopeSampleMap; + }; + +} // namespace JSC + +#endif // SamplingTool_h |