tracing: Add macros for generating context trace events

base/trace_event/trace_event_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <cstdlib>
 
@@ skipping 485 matching lines @@
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
         "all", "tracked object 1", 0x42, "hello");
     TRACE_EVENT_OBJECT_DELETED_WITH_ID("all", "tracked object 1", 0x42);
 
     TraceScopedTrackableObject<int> trackable("all", "tracked object 2",
                                               0x2128506);
     trackable.snapshot("world");
 
     TRACE_EVENT1(kControlCharacters, kControlCharacters,
                  kControlCharacters, kControlCharacters);
+
+    TraceContext context(reinterpret_cast<TraceContext>(0x20151021));
+    TRACE_EVENT_ENTER_CONTEXT("all", "TRACE_EVENT_ENTER_CONTEXT call", context);
+    TRACE_EVENT_LEAVE_CONTEXT("all", "TRACE_EVENT_LEAVE_CONTEXT call", context);
+    TRACE_EVENT_SCOPED_CONTEXT("all", "TRACE_EVENT_SCOPED_CONTEXT call",
+                               context);
   }  // Scope close causes TRACE_EVENT0 etc to send their END events.
 
   if (task_complete_event)
     task_complete_event->Signal();
 }
 
 void ValidateAllTraceMacrosCreatedData(const ListValue& trace_parsed) {
   const DictionaryValue* item = NULL;
 
 #define EXPECT_FIND_(string) \
@@ skipping 327 matching lines @@
     item = FindTraceEntry(trace_parsed, "tracked object 2", item);
     EXPECT_TRUE(item);
     EXPECT_TRUE(item && item->GetString("ph", &phase));
     EXPECT_EQ("D", phase);
     EXPECT_TRUE(item && item->GetString("id", &id));
     EXPECT_EQ("0x2128506", id);
   }
 
   EXPECT_FIND_(kControlCharacters);
   EXPECT_SUB_FIND_(kControlCharacters);
+
+  EXPECT_FIND_("TRACE_EVENT_ENTER_CONTEXT call");
+  {
+    std::string ph;
+    EXPECT_TRUE((item && item->GetString("ph", &ph)));
+    EXPECT_EQ("(", ph);
+
+    std::string id;
+    EXPECT_TRUE((item && item->GetString("id", &id)));
+    EXPECT_EQ("0x20151021", id);
+  }
+
+  EXPECT_FIND_("TRACE_EVENT_LEAVE_CONTEXT call");
+  {
+    std::string ph;
+    EXPECT_TRUE((item && item->GetString("ph", &ph)));
+    EXPECT_EQ(")", ph);
+
+    std::string id;
+    EXPECT_TRUE((item && item->GetString("id", &id)));
+    EXPECT_EQ("0x20151021", id);
+  }
+
+  std::vector<const DictionaryValue*> scoped_context_calls =
+      FindTraceEntries(trace_parsed, "TRACE_EVENT_SCOPED_CONTEXT call");
+  EXPECT_EQ(2u, scoped_context_calls.size());
+  {
+    item = scoped_context_calls[0];
+    std::string ph;
+    EXPECT_TRUE((item && item->GetString("ph", &ph)));
+    EXPECT_EQ("(", ph);
+
+    std::string id;
+    EXPECT_TRUE((item && item->GetString("id", &id)));
+    EXPECT_EQ("0x20151021", id);
+  }
+
+  {
+    item = scoped_context_calls[1];
+    std::string ph;
+    EXPECT_TRUE((item && item->GetString("ph", &ph)));
+    EXPECT_EQ(")", ph);
+
+    std::string id;
+    EXPECT_TRUE((item && item->GetString("id", &id)));
+    EXPECT_EQ("0x20151021", id);
+  }
 }
 
 void TraceManyInstantEvents(int thread_id, int num_events,
                             WaitableEvent* task_complete_event) {
   for (int i = 0; i < num_events; i++) {
     TRACE_EVENT_INSTANT2("all", "multi thread event",
                          TRACE_EVENT_SCOPE_THREAD,
                          "thread", thread_id,
                          "event", i);
   }
@@ skipping 2164 matching lines @@
 }
 
 TEST_F(TraceEventTestFixture, SyntheticDelayConfigurationToString) {
   const char filter[] = "DELAY(test.Delay;16;oneshot)";
   TraceConfig config(filter, "");
   EXPECT_EQ(filter, config.ToCategoryFilterString());
 }
 
 }  // namespace trace_event
 }  // namespace base