Integrate Chrome tracing with V8 (WIP)

src/tracing/event-tracer.cc

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2015 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
+#include <include/v8-tracing.h>
+#include <stdio.h>
+#ifndef NULL
+#define NULL (0)
+#endif
 
-// Checks that comma expression in conditional context is processed correctly.
+class DefaultEventTracer : public v8::EventTracer {
+  virtual v8::EventTracer::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) {
+    return 0;
+  }
 
-function withCommaExpressionInConditional(x) {
-  if (x > 1000) { for (var i = 0; i < 10000; i++) { } }
-  var y;
-  if (y = x, y > 1) {
-    return 'big';
+  virtual void updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
+                                        const char* name,
+                                        EventTracer::Handle handle) {}
+
+  virtual const uint8_t* getCategoryGroupEnabled(const char* name) {
+    static uint8_t no = 0x7;
+    return &no;
   }
-  return (y = x + 1, y > 1) ? 'medium' : 'small';
+
+  virtual const char* getCategoryGroupName(const uint8_t* categoryEnabledFlag) {
+    static const char* dummy = "V8";
+    return dummy;
+  }
+};
+
+v8::EventTracer* v8::EventTracer::gInstance;
+
+static void intialize_default_tracer(v8::EventTracer* current_instance) {
+  if (NULL == current_instance) {
+    v8::EventTracer::SetInstance(new (DefaultEventTracer));
+  }
 }
 
-for (var i = 0; i < 5; i++) {
-  withCommaExpressionInConditional(i);
+
+v8::EventTracer* v8::EventTracer::GetInstance() {
+  if (NULL == v8::EventTracer::gInstance) {
+    intialize_default_tracer(NULL);
+  }
+  return v8::EventTracer::gInstance;
 }
-%OptimizeFunctionOnNextCall(withCommaExpressionInConditional);
-withCommaExpressionInConditional(i);
-withCommaExpressionInConditional("1")