1 files changed, 74 insertions, 0 deletions
diff --git a/Source/WebCore/platform/chromium/TraceEvent.h b/Source/WebCore/platform/chromium/TraceEvent.h
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+++ b/Source/WebCore/platform/chromium/TraceEvent.h
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+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
+ */
+#ifndef TraceEvent_h
+#define TraceEvent_h
+
+#include "PlatformBridge.h"
+
+// Implementation detail: trace event macros create temporary variables
+// to keep instrumentation overhead low. These macros give each temporary
+// variable a unique name based on the line number to prevent name collissions.
+#define TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER3(a, b) a##b
+#define TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER2(a, b) TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER3(a, b)
+#define TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER(name_prefix) TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER2(name_prefix, __LINE__)
+
+// Issues PlatformBridge::traceEventBegin and traceEventEnd calls for the enclosing scope
+#define TRACE_EVENT(name, id, extra) WebCore::internal::ScopeTracer TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER(__traceEventScope)(name, id, extra);
+
+namespace WebCore {
+
+namespace internal {
+
+// Used by TRACE_EVENT macro. Do not use directly.
+class ScopeTracer {
+public:
+    ScopeTracer(const char* name, void*, const char* extra);
+    ~ScopeTracer();
+
+private:
+    const char* m_name;
+    void* m_id;
+    OwnPtr<char*> m_extra;
+};
+
+inline ScopeTracer::ScopeTracer(const char* name, void* id, const char* extra)
+    : m_name(name)
+    , m_id(id)
+{
+    PlatformBridge::traceEventBegin(name, id, extra); \
+    if (extra)
+        m_extra = adoptPtr(strdup(extra));
+}
+
+inline ScopeTracer::~ScopeTracer()
+{
+    PlatformBridge::traceEventEnd(m_name, m_id, m_extra.get());
+}
+
+} // namespace internal
+
+} // namespace WebCore
+
+#endif