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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkChromeTracingTracer_DEFINED
#define SkChromeTracingTracer_DEFINED
#include "SkEventTracer.h"
#include "SkEventTracingPriv.h"
#include "SkJSONCPP.h"
#include "SkSpinlock.h"
#include "SkString.h"
#include "SkTHash.h"
/**
* A SkEventTracer implementation that logs events to JSON for viewing with chrome://tracing.
*/
class SkChromeTracingTracer : public SkEventTracer {
public:
SkChromeTracingTracer(const char* filename);
~SkChromeTracingTracer() override;
SkEventTracer::Handle addTraceEvent(char phase,
const uint8_t* categoryEnabledFlag,
const char* name,
uint64_t id,
int numArgs,
const char** argNames,
const uint8_t* argTypes,
const uint64_t* argValues,
uint8_t flags) override;
void updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
const char* name,
SkEventTracer::Handle handle) override;
const uint8_t* getCategoryGroupEnabled(const char* name) override {
return fCategories.getCategoryGroupEnabled(name);
}
const char* getCategoryGroupName(const uint8_t* categoryEnabledFlag) override {
return fCategories.getCategoryGroupName(categoryEnabledFlag);
}
private:
void flush();
enum {
// Events are currently 88 bytes, assuming 64-bit pointers and reasonable packing.
// This is a first guess at a number that balances memory usage vs. time overhead of
// allocating blocks.
kEventsPerBlock = 10000,
// Our current tracing macros only support up to 2 arguments
kMaxArgs = 2,
};
struct TraceEvent {
// Fields are ordered to minimize size due to alignment
char fPhase;
uint8_t fNumArgs;
uint8_t fArgTypes[kMaxArgs];
const char* fName;
const char* fCategory;
uint64_t fID;
uint64_t fClockBegin;
uint64_t fClockEnd;
SkThreadID fThreadID;
const char* fArgNames[kMaxArgs];
uint64_t fArgValues[kMaxArgs];
};
typedef std::unique_ptr<TraceEvent[]> BlockPtr;
BlockPtr createBlock();
typedef SkTHashMap<uint64_t, const char*> BaseTypeResolver;
TraceEvent* appendEvent(const TraceEvent&);
Json::Value traceEventToJson(const TraceEvent&, BaseTypeResolver* baseTypeResolver);
SkString fFilename;
SkSpinlock fMutex;
SkEventTracingCategories fCategories;
BlockPtr fCurBlock;
int fEventsInCurBlock;
SkTArray<BlockPtr> fBlocks;
};
#endif
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