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1 /*
2  * Copyright 2014 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "SkEventTracer.h"
9 #include "SkOnce.h"
10 
11 class SkDefaultEventTracer: public SkEventTracer {
12     virtual 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)13         addTraceEvent(char phase,
14                       const uint8_t* categoryEnabledFlag,
15                       const char* name,
16                       uint64_t id,
17                       int numArgs,
18                       const char** argNames,
19                       const uint8_t* argTypes,
20                       const uint64_t* argValues,
21                       uint8_t flags) SK_OVERRIDE { return 0; }
22 
23     virtual void
updateTraceEventDuration(const uint8_t * categoryEnabledFlag,const char * name,SkEventTracer::Handle handle)24         updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
25                                  const char* name,
26                                  SkEventTracer::Handle handle) SK_OVERRIDE {};
27 
getCategoryGroupEnabled(const char * name)28     virtual const uint8_t* getCategoryGroupEnabled(const char* name) SK_OVERRIDE {
29         static uint8_t no = 0;
30         return &no;
31     };
getCategoryGroupName(const uint8_t * categoryEnabledFlag)32     virtual const char* getCategoryGroupName(
33       const uint8_t* categoryEnabledFlag) SK_OVERRIDE {
34         static const char* dummy = "dummy";
35         return dummy;
36     };
37 };
38 
39 SkEventTracer* SkEventTracer::gInstance;
40 
cleanup_tracer()41 static void cleanup_tracer() {
42     // calling SetInstance will delete the existing instance.
43     SkEventTracer::SetInstance(NULL);
44 }
45 
intialize_default_tracer(SkEventTracer * current_instance)46 static void intialize_default_tracer(SkEventTracer* current_instance) {
47     if (NULL == current_instance) {
48         SkEventTracer::SetInstance(SkNEW(SkDefaultEventTracer));
49     }
50     atexit(cleanup_tracer);
51 }
52 
53 
GetInstance()54 SkEventTracer* SkEventTracer::GetInstance() {
55     SK_DECLARE_STATIC_ONCE(once);
56     SkOnce(&once, intialize_default_tracer, SkEventTracer::gInstance);
57     SkASSERT(SkEventTracer::gInstance);
58     return SkEventTracer::gInstance;
59 }
60