blob: 56eed3221cf3ebec8341d4169241d256b637b2df [file] [log] [blame]
* 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 ChromeTracingTracer_DEFINED
#define ChromeTracingTracer_DEFINED
#include "include/core/SkString.h"
#include "include/private/SkSpinlock.h"
#include "include/private/SkTHash.h"
#include "include/utils/SkEventTracer.h"
#include "tools/trace/EventTracingPriv.h"
class SkJSONWriter;
* A SkEventTracer implementation that logs events to JSON for viewing with chrome://tracing.
class ChromeTracingTracer : public SkEventTracer {
ChromeTracingTracer(const char* filename);
~ChromeTracingTracer() 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);
void flush();
enum {
// Events are variable size, but most commonly 48 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.
kBlockSize = 512 * 1024,
typedef std::unique_ptr<uint8_t[]> BlockPtr;
struct TraceEventBlock {
BlockPtr fBlock;
int fEventsInBlock;
void createBlock();
Handle appendEvent(const void* data, size_t size);
SkString fFilename;
SkSpinlock fMutex;
SkEventTracingCategories fCategories;
TraceEventBlock fCurBlock;
size_t fCurBlockUsed;
SkTArray<TraceEventBlock> fBlocks;