bc8150feef
Bug: skia: Change-Id: I401c5a9885c348aa424ab07b094acecddb209490 Reviewed-on: https://skia-review.googlesource.com/25860 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Mike Klein <mtklein@google.com> Reviewed-by: Brian Salomon <bsalomon@google.com>
90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkChromeTracingTracer_DEFINED
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#define SkChromeTracingTracer_DEFINED
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#include "SkEventTracer.h"
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#include "SkEventTracingPriv.h"
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#include "SkJSONCPP.h"
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#include "SkSpinlock.h"
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#include "SkString.h"
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/**
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* A SkEventTracer implementation that logs events to JSON for viewing with chrome://tracing.
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*/
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class SkChromeTracingTracer : public SkEventTracer {
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public:
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SkChromeTracingTracer(const char* filename);
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~SkChromeTracingTracer() override;
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SkEventTracer::Handle addTraceEvent(char phase,
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const uint8_t* categoryEnabledFlag,
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const char* name,
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uint64_t id,
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int numArgs,
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const char** argNames,
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const uint8_t* argTypes,
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const uint64_t* argValues,
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uint8_t flags) override;
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void updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
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const char* name,
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SkEventTracer::Handle handle) override;
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const uint8_t* getCategoryGroupEnabled(const char* name) override {
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return fCategories.getCategoryGroupEnabled(name);
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}
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const char* getCategoryGroupName(const uint8_t* categoryEnabledFlag) override {
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return fCategories.getCategoryGroupName(categoryEnabledFlag);
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}
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private:
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void flush();
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enum {
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// Events are currently 80 bytes, assuming 64-bit pointers and reasonable packing.
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// This is a first guess at a number that balances memory usage vs. time overhead of
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// allocating blocks.
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kEventsPerBlock = 10000,
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// Our current tracing macros only support up to 2 arguments
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kMaxArgs = 2,
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};
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struct TraceEvent {
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// Fields are ordered to minimize size due to alignment
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char fPhase;
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uint8_t fNumArgs;
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uint8_t fArgTypes[kMaxArgs];
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const char* fName;
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const char* fCategory;
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uint64_t fClockBegin;
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uint64_t fClockEnd;
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SkThreadID fThreadID;
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const char* fArgNames[kMaxArgs];
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uint64_t fArgValues[kMaxArgs];
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};
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typedef std::unique_ptr<TraceEvent[]> BlockPtr;
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BlockPtr createBlock();
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TraceEvent* appendEvent(const TraceEvent&);
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Json::Value traceEventToJson(const TraceEvent&);
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SkString fFilename;
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SkSpinlock fMutex;
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SkEventTracingCategories fCategories;
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BlockPtr fCurBlock;
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int fEventsInCurBlock;
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SkTArray<BlockPtr> fBlocks;
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};
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#endif
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