X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/9dae56ea45a0f5f8136a5c93d6f3a7f99399ca73..4e4e5a6f2694187498445a6ac6f1634ce8141119:/bytecode/SamplingTool.h diff --git a/bytecode/SamplingTool.h b/bytecode/SamplingTool.h index d1cf2e8..8e3ed9e 100644 --- a/bytecode/SamplingTool.h +++ b/bytecode/SamplingTool.h @@ -38,15 +38,65 @@ namespace JSC { + class ScriptExecutable; + + class SamplingFlags { + friend class JIT; + 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; + }; + +#endif + private: + static uint32_t s_flags; +#if ENABLE(SAMPLING_FLAGS) + static uint64_t s_flagCounts[33]; +#endif + }; + class CodeBlock; class ExecState; class Interpreter; class ScopeNode; struct Instruction; - struct ScopeSampleRecord { - ScopeSampleRecord(ScopeNode* scope) - : m_scope(scope) + struct ScriptSampleRecord { + ScriptSampleRecord(ScriptExecutable* executable) + : m_executable(executable) , m_codeBlock(0) , m_sampleCount(0) , m_opcodeSampleCount(0) @@ -55,7 +105,7 @@ namespace JSC { { } - ~ScopeSampleRecord() + ~ScriptSampleRecord() { if (m_samples) free(m_samples); @@ -63,7 +113,7 @@ namespace JSC { void sample(CodeBlock*, Instruction*); - RefPtr m_scope; + RefPtr m_executable; CodeBlock* m_codeBlock; int m_sampleCount; int m_opcodeSampleCount; @@ -71,15 +121,28 @@ namespace JSC { unsigned m_size; }; - typedef WTF::HashMap ScopeSampleRecordMap; + typedef WTF::HashMap 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 class CallRecord; + friend struct CallRecord; friend class HostCallRecord; #if ENABLE(OPCODE_SAMPLING) - class CallRecord : Noncopyable { + class CallRecord : public Noncopyable { public: CallRecord(SamplingTool* samplingTool) : m_samplingTool(samplingTool) @@ -109,7 +172,7 @@ namespace JSC { } }; #else - class CallRecord : Noncopyable { + class CallRecord : public Noncopyable { public: CallRecord(SamplingTool*) { @@ -127,12 +190,13 @@ namespace JSC { 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()) +#if ENABLE(CODEBLOCK_SAMPLING) + , m_scopeSampleMap(new ScriptSampleRecordMap()) +#endif { memset(m_opcodeSamples, 0, sizeof(m_opcodeSamples)); memset(m_opcodeSamplesInCTIFunctions, 0, sizeof(m_opcodeSamplesInCTIFunctions)); @@ -140,14 +204,15 @@ namespace JSC { ~SamplingTool() { +#if ENABLE(CODEBLOCK_SAMPLING) deleteAllValues(*m_scopeSampleMap); +#endif } - void start(unsigned hertz=10000); - void stop(); + void setup(); void dump(ExecState*); - void notifyOfScope(ScopeNode* scope); + void notifyOfScope(ScriptExecutable* scope); void sample(CodeBlock* codeBlock, Instruction* vPC) { @@ -165,6 +230,8 @@ namespace JSC { return reinterpret_cast(reinterpret_cast(vPC) | (static_cast(inCTIFunction) << 1) | static_cast(inHostFunction)); } + static void sample(); + private: class Sample { public: @@ -174,7 +241,7 @@ namespace JSC { { } - bool isNull() { return !m_sample || !m_codeBlock; } + bool isNull() { return !m_sample; } CodeBlock* codeBlock() { return m_codeBlock; } Instruction* vPC() { return reinterpret_cast(m_sample & ~0x3); } bool inHostFunction() { return m_sample & 0x1; } @@ -184,17 +251,12 @@ namespace JSC { intptr_t m_sample; CodeBlock* m_codeBlock; }; - - static void* threadStartFunc(void*); - void run(); + + void doRun(); + static SamplingTool* s_samplingTool; 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; @@ -205,9 +267,147 @@ namespace JSC { unsigned m_opcodeSamples[numOpcodeIDs]; unsigned m_opcodeSamplesInCTIFunctions[numOpcodeIDs]; - Mutex m_scopeSampleMapMutex; - OwnPtr m_scopeSampleMap; +#if ENABLE(CODEBLOCK_SAMPLING) + Mutex m_scriptSampleMapMutex; + OwnPtr m_scopeSampleMap; +#endif + }; + + // AbstractSamplingCounter: + // + // Implements a named set of counters, printed on exit if ENABLE(SAMPLING_COUNTERS). + // See subclasses below, SamplingCounter, GlobalSamplingCounter and DeletableSamplingCounter. + class AbstractSamplingCounter { + friend class JIT; + friend class DeletableSamplingCounter; + public: + void count(uint32_t count = 1) + { + m_counter += count; + } + + static void dump(); + + protected: + // Effectively the contructor, however called lazily in the case of GlobalSamplingCounter. + void init(const char* name) + { + m_counter = 0; + m_name = name; + + // Set m_next to point to the head of the chain, and inform whatever is + // currently at the head that this node will now hold the pointer to it. + m_next = s_abstractSamplingCounterChain; + s_abstractSamplingCounterChain->m_referer = &m_next; + // Add this node to the head of the list. + s_abstractSamplingCounterChain = this; + m_referer = &s_abstractSamplingCounterChain; + } + + int64_t m_counter; + const char* m_name; + AbstractSamplingCounter* m_next; + // This is a pointer to the pointer to this node in the chain; used to + // allow fast linked list deletion. + AbstractSamplingCounter** m_referer; + // Null object used to detect end of static chain. + static AbstractSamplingCounter s_abstractSamplingCounterChainEnd; + static AbstractSamplingCounter* s_abstractSamplingCounterChain; + static bool s_completed; + }; + +#if ENABLE(SAMPLING_COUNTERS) + // SamplingCounter: + // + // This class is suitable and (hopefully!) convenient for cases where a counter is + // required within the scope of a single function. It can be instantiated as a + // static variable since it contains a constructor but not a destructor (static + // variables in WebKit cannot have destructors). + // + // For example: + // + // void someFunction() + // { + // static SamplingCounter countMe("This is my counter. There are many like it, but this one is mine."); + // countMe.count(); + // // ... + // } + // + class SamplingCounter : public AbstractSamplingCounter { + public: + SamplingCounter(const char* name) { init(name); } + }; + + // GlobalSamplingCounter: + // + // This class is suitable for use where a counter is to be declared globally, + // since it contains neither a constructor nor destructor. Instead, ensure + // that 'name()' is called to provide the counter with a name (and also to + // allow it to be printed out on exit). + // + // GlobalSamplingCounter globalCounter; + // + // void firstFunction() + // { + // // Put this within a function that is definitely called! + // // (Or alternatively alongside all calls to 'count()'). + // globalCounter.name("I Name You Destroyer."); + // globalCounter.count(); + // // ... + // } + // + // void secondFunction() + // { + // globalCounter.count(); + // // ... + // } + // + class GlobalSamplingCounter : public AbstractSamplingCounter { + public: + void name(const char* name) + { + // Global objects should be mapped in zero filled memory, so this should + // be a safe (albeit not necessarily threadsafe) check for 'first call'. + if (!m_next) + init(name); + } + }; + + // DeletableSamplingCounter: + // + // The above classes (SamplingCounter, GlobalSamplingCounter), are intended for + // use within a global or static scope, and as such cannot have a destructor. + // This means there is no convenient way for them to remove themselves from the + // static list of counters, and should an instance of either class be freed + // before 'dump()' has walked over the list it will potentially walk over an + // invalid pointer. + // + // This class is intended for use where the counter may possibly be deleted before + // the program exits. Should this occur, the counter will print it's value to + // stderr, and remove itself from the static list. Example: + // + // DeletableSamplingCounter* counter = new DeletableSamplingCounter("The Counter With No Name"); + // counter->count(); + // delete counter; + // + class DeletableSamplingCounter : public AbstractSamplingCounter { + public: + DeletableSamplingCounter(const char* name) { init(name); } + + ~DeletableSamplingCounter() + { + if (!s_completed) + fprintf(stderr, "DeletableSamplingCounter \"%s\" deleted early (with count %lld)\n", m_name, m_counter); + // Our m_referer pointer should know where the pointer to this node is, + // and m_next should know that this node is the previous node in the list. + ASSERT(*m_referer == this); + ASSERT(m_next->m_referer == &m_next); + // Remove this node from the list, and inform m_next that we have done so. + m_next->m_referer = m_referer; + *m_referer = m_next; + } }; +#endif } // namespace JSC