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 "SkAtomics.h" 9 #include "SkEventTracer.h" 10 #include "SkLazyPtr.h" 11 12 class SkDefaultEventTracer : public SkEventTracer { 13 SkEventTracer::Handle 14 addTraceEvent(char phase, 15 const uint8_t* categoryEnabledFlag, 16 const char* name, 17 uint64_t id, 18 int numArgs, 19 const char** argNames, 20 const uint8_t* argTypes, 21 const uint64_t* argValues, 22 uint8_t flags) override { return 0; } 23 24 void 25 updateTraceEventDuration(const uint8_t* categoryEnabledFlag, 26 const char* name, 27 SkEventTracer::Handle handle) override {} 28 29 const uint8_t* getCategoryGroupEnabled(const char* name) override { 30 static uint8_t no = 0; 31 return &no; 32 } 33 const char* getCategoryGroupName( 34 const uint8_t* categoryEnabledFlag) override { 35 static const char* dummy = "dummy"; 36 return dummy; 37 } 38 }; 39 40 // We prefer gUserTracer if it's been set, otherwise we fall back on gDefaultTracer. 41 static SkEventTracer* gUserTracer = nullptr; 42 SK_DECLARE_STATIC_LAZY_PTR(SkDefaultEventTracer, gDefaultTracer); 43 44 void SkEventTracer::SetInstance(SkEventTracer* tracer) { 45 SkASSERT(nullptr == sk_atomic_load(&gUserTracer, sk_memory_order_acquire)); 46 sk_atomic_store(&gUserTracer, tracer, sk_memory_order_release); 47 // An atomic load during process shutdown is probably overkill, but safe overkill. 48 atexit([](){ SkDELETE(sk_atomic_load(&gUserTracer, sk_memory_order_acquire)); }); 49 } 50 51 SkEventTracer* SkEventTracer::GetInstance() { 52 if (SkEventTracer* tracer = sk_atomic_load(&gUserTracer, sk_memory_order_acquire)) { 53 return tracer; 54 } 55 return gDefaultTracer.get(); 56 } 57
