namespace JSC {
+ 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;
typedef WTF::HashMap<ScopeNode*, ScopeSampleRecord*> ScopeSampleRecordMap;
+ 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;
SamplingTool(Interpreter* interpreter)
: m_interpreter(interpreter)
- , m_running(false)
, m_codeBlock(0)
, m_sample(0)
, m_sampleCount(0)
, m_opcodeSampleCount(0)
+#if ENABLE(CODEBLOCK_SAMPLING)
, m_scopeSampleMap(new ScopeSampleRecordMap())
+#endif
{
memset(m_opcodeSamples, 0, sizeof(m_opcodeSamples));
memset(m_opcodeSamplesInCTIFunctions, 0, sizeof(m_opcodeSamplesInCTIFunctions));
~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);
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:
{
}
- bool isNull() { return !m_sample || !m_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; }
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;
unsigned m_opcodeSamples[numOpcodeIDs];
unsigned m_opcodeSamplesInCTIFunctions[numOpcodeIDs];
+#if ENABLE(CODEBLOCK_SAMPLING)
Mutex m_scopeSampleMapMutex;
OwnPtr<ScopeSampleRecordMap> 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
projects / apple / javascriptcore.git / blobdiff