1 /* 2 * Copyright 2017 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 "SkEventTracingPriv.h" 9 10 #include "SkATrace.h" 11 #include "SkChromeTracingTracer.h" 12 #include "SkCommandLineFlags.h" 13 #include "SkDebugfTracer.h" 14 #include "SkEventTracer.h" 15 #include "SkTraceEvent.h" 16 17 DEFINE_string(trace, "", 18 "Log trace events in one of several modes:\n" 19 " debugf : Show events using SkDebugf\n" 20 " atrace : Send events to Android ATrace\n" 21 " <filename> : Any other string is interpreted as a filename. Writes\n" 22 " trace events to specified file as JSON, for viewing\n" 23 " with chrome://tracing"); 24 25 DEFINE_string(traceMatch, "", 26 "Filter which categories are traced.\n" 27 "Uses same format as --match\n"); 28 29 void initializeEventTracingForTools(const char* traceFlag) { 30 if (!traceFlag) { 31 if (FLAGS_trace.isEmpty()) { 32 return; 33 } 34 traceFlag = FLAGS_trace[0]; 35 } 36 37 SkEventTracer* eventTracer = nullptr; 38 if (0 == strcmp(traceFlag, "atrace")) { 39 eventTracer = new SkATrace(); 40 } else if (0 == strcmp(traceFlag, "debugf")) { 41 eventTracer = new SkDebugfTracer(); 42 } else { 43 eventTracer = new SkChromeTracingTracer(traceFlag); 44 } 45 46 SkAssertResult(SkEventTracer::SetInstance(eventTracer)); 47 } 48 49 uint8_t* SkEventTracingCategories::getCategoryGroupEnabled(const char* name) { 50 static_assert(0 == offsetof(CategoryState, fEnabled), "CategoryState"); 51 52 // We ignore the "disabled-by-default-" prefix in our internal tools 53 if (SkStrStartsWith(name, TRACE_CATEGORY_PREFIX)) { 54 name += strlen(TRACE_CATEGORY_PREFIX); 55 } 56 57 // Chrome's implementation of this API does a two-phase lookup (once without a lock, then again 58 // with a lock. But the tracing macros avoid calling these functions more than once per site, 59 // so just do something simple (and easier to reason about): 60 SkAutoMutexAcquire lock(&fMutex); 61 for (int i = 0; i < fNumCategories; ++i) { 62 if (0 == strcmp(name, fCategories[i].fName)) { 63 return reinterpret_cast<uint8_t*>(&fCategories[i]); 64 } 65 } 66 67 if (fNumCategories >= kMaxCategories) { 68 SkDEBUGFAIL("Exhausted event tracing categories. Increase kMaxCategories."); 69 return reinterpret_cast<uint8_t*>(&fCategories[0]); 70 } 71 72 fCategories[fNumCategories].fEnabled = SkCommandLineFlags::ShouldSkip(FLAGS_traceMatch, name) 73 ? 0 : SkEventTracer::kEnabledForRecording_CategoryGroupEnabledFlags; 74 75 fCategories[fNumCategories].fName = name; 76 return reinterpret_cast<uint8_t*>(&fCategories[fNumCategories++]); 77 } 78 79 const char* SkEventTracingCategories::getCategoryGroupName(const uint8_t* categoryEnabledFlag) { 80 if (categoryEnabledFlag) { 81 return reinterpret_cast<const CategoryState*>(categoryEnabledFlag)->fName; 82 } 83 return nullptr; 84 } 85
