1 files changed, 119 insertions, 0 deletions
diff --git a/Source/WTF/wtf/SystemTracing.h b/Source/WTF/wtf/SystemTracing.h
new file mode 100644
index 000000000..968fd678c
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+++ b/Source/WTF/wtf/SystemTracing.h
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2016 Apple 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 INC. ``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 INC. 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. 
+ */
+
+#pragma once
+
+#if USE(APPLE_INTERNAL_SDK)
+#include <System/sys/kdebug.h>
+#define HAVE_KDEBUG_H 1
+#endif
+
+// No namespaces because this file has to be includable from C and Objective-C.
+
+// Reserved component code. Do not change this.
+#define WEBKIT_COMPONENT 47
+
+// Trace point codes can be up to 14 bits (0-16383).
+// When adding or changing these codes, update Tools/Tracing/SystemTracePoints.plist to match.
+enum TracePointCode {
+    WTFRange = 0,
+
+    JavaScriptRange = 2500,
+    VMEntryScopeStart,
+    VMEntryScopeEnd,
+
+    WebCoreRange = 5000,
+    StyleRecalcStart,
+    StyleRecalcEnd,
+    LayoutStart,
+    LayoutEnd,
+    PaintViewStart,
+    PaintViewEnd,
+    PaintLayerStart,
+    PaintLayerEnd,
+    RAFDisplayLinkScheduled,
+    RAFDisplayLinkFired,
+    RAFCallbackStart,
+    RAFCallbackEnd,
+
+    WebKitRange = 10000,
+    WebKit2Range = 12000,
+
+    RAFDidUpdateStart,
+    RAFDidUpdateEnd,
+    RAFBackingStoreFlushStart,
+    RAFBackingStoreFlushEnd,
+    RAFBuildTransactionStart,
+    RAFBuildTransactionEnd,
+
+    UIProcessRange = 14000,
+
+    RAFCommitLayerTreeStart,
+    RAFCommitLayerTreeEnd,
+    RAFDidRefreshDisplayStart,
+    RAFDidRefreshDisplayEnd,
+};
+
+#ifdef __cplusplus
+
+namespace WTF {
+
+inline void TracePoint(TracePointCode code, uint64_t data1 = 0, uint64_t data2 = 0, uint64_t data3 = 0, uint64_t data4 = 0)
+{
+#if HAVE(KDEBUG_H)
+    kdebug_trace(ARIADNEDBG_CODE(WEBKIT_COMPONENT, code), data1, data2, data3, data4);
+#else
+    UNUSED_PARAM(code);
+    UNUSED_PARAM(data1);
+    UNUSED_PARAM(data2);
+    UNUSED_PARAM(data3);
+    UNUSED_PARAM(data4);
+#endif
+}
+
+class TraceScope {
+public:
+
+    TraceScope(TracePointCode entryCode, TracePointCode exitCode)
+        : m_exitCode(exitCode)
+    {
+        TracePoint(entryCode);
+    }
+
+    ~TraceScope()
+    {
+        TracePoint(m_exitCode);
+    }
+
+private:
+    TracePointCode m_exitCode;
+};
+
+} // namespace WTF
+
+using WTF::TraceScope;
+using WTF::TracePoint;
+
+#endif // __cplusplus