Add Scoped Context Info (Isolate) to V8 Traces

test/cctest/test-trace-event.cc

 // Copyright 2015 the V8 project 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 <stdlib.h>
 #include <string.h>
 
 #include "src/v8.h"
 
 #include "src/list.h"
 #include "src/list-inl.h"
@@ skipping 238 matching lines @@
   TRACE_EVENT_ASYNC_END0("v8-cat", "a1", event_id);
 
   CHECK_EQ(2, GET_TRACE_OBJECTS_LIST->length());
   CHECK_EQ(TRACE_EVENT_PHASE_ASYNC_BEGIN, GET_TRACE_OBJECT(0)->phase);
   CHECK_EQ(event_id, GET_TRACE_OBJECT(0)->id);
   CHECK_EQ(TRACE_EVENT_PHASE_ASYNC_END, GET_TRACE_OBJECT(1)->phase);
   CHECK_EQ(event_id, GET_TRACE_OBJECT(1)->id);
 
   i::V8::SetPlatformForTesting(old_platform);
 }
+
+TEST(TestEventInContext) {
+  v8::Platform* old_platform = i::V8::GetCurrentPlatform();
+  MockTracingPlatform platform(old_platform);
+  i::V8::SetPlatformForTesting(&platform);
+
+  static uint64_t isolate_id = 0x20151021;
+  {
+    TRACE_EVENT_SCOPED_CONTEXT("v8-cat", "Isolate", isolate_id);
+    TRACE_EVENT0("v8-cat", "e");
+  }
+
+  CHECK_EQ(3, GET_TRACE_OBJECTS_LIST->length());
+  CHECK_EQ(TRACE_EVENT_PHASE_ENTER_CONTEXT, GET_TRACE_OBJECT(0)->phase);
+  CHECK_EQ("Isolate", GET_TRACE_OBJECT(0)->name);
+  CHECK_EQ(isolate_id, GET_TRACE_OBJECT(0)->id);
+  CHECK_EQ(TRACE_EVENT_PHASE_COMPLETE, GET_TRACE_OBJECT(1)->phase);
+  CHECK_EQ("e", GET_TRACE_OBJECT(1)->name);
+  CHECK_EQ(TRACE_EVENT_PHASE_LEAVE_CONTEXT, GET_TRACE_OBJECT(2)->phase);
+  CHECK_EQ("Isolate", GET_TRACE_OBJECT(2)->name);
+  CHECK_EQ(isolate_id, GET_TRACE_OBJECT(2)->id);
+
+  i::V8::SetPlatformForTesting(old_platform);
+}