1 files changed, 151 insertions, 0 deletions
diff --git a/base/debug/trace_event_win.h b/base/debug/trace_event_win.h
new file mode 100644
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--- /dev/null
+++ b/base/debug/trace_event_win.h
@@ -0,0 +1,151 @@
+// Copyright (c) 2010 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.
+
+// This file contains the Windows-specific declarations for trace_event.h.
+#ifndef BASE_DEBUG_TRACE_EVENT_WIN_H_
+#define BASE_DEBUG_TRACE_EVENT_WIN_H_
+#pragma once
+
+#include <string>
+#include "base/win/event_trace_provider.h"
+
+#define TRACE_EVENT_BEGIN(name, id, extra) \
+  base::debug::TraceLog::Trace( \
+      name, \
+      base::debug::TraceLog::EVENT_BEGIN, \
+      reinterpret_cast<const void*>(id), \
+      extra);
+
+#define TRACE_EVENT_END(name, id, extra) \
+  base::debug::TraceLog::Trace( \
+      name, \
+      base::debug::TraceLog::EVENT_END, \
+      reinterpret_cast<const void*>(id), \
+      extra);
+
+#define TRACE_EVENT_INSTANT(name, id, extra) \
+  base::debug::TraceLog::Trace( \
+      name, \
+      base::debug::TraceLog::EVENT_INSTANT, \
+      reinterpret_cast<const void*>(id), \
+      extra);
+
+// Fwd.
+template <typename Type>
+struct StaticMemorySingletonTraits;
+
+namespace base {
+namespace debug {
+
+// This EtwTraceProvider subclass implements ETW logging
+// for the macros above on Windows.
+class TraceLog : public base::win::EtwTraceProvider {
+ public:
+  enum EventType {
+    EVENT_BEGIN,
+    EVENT_END,
+    EVENT_INSTANT
+  };
+
+  // Start logging trace events.
+  // This is a noop in this implementation.
+  static bool StartTracing();
+
+  // Trace begin/end/instant events, this is the bottleneck implementation
+  // all the others defer to.
+  // Allowing the use of std::string for name or extra is a convenience,
+  // whereas passing name or extra as a const char* avoids the construction
+  // of temporary std::string instances.
+  // If -1 is passed for name_len or extra_len, the strlen of the string will
+  // be used for length.
+  static void Trace(const char* name,
+                    size_t name_len,
+                    EventType type,
+                    const void* id,
+                    const char* extra,
+                    size_t extra_len);
+
+  // Allows passing extra as a std::string for convenience.
+  static void Trace(const char* name,
+                    EventType type,
+                    const void* id,
+                    const std::string& extra) {
+    return Trace(name, -1, type, id, extra.c_str(), extra.length());
+  }
+
+  // Allows passing extra as a const char* to avoid constructing temporary
+  // std::string instances where not needed.
+  static void Trace(const char* name,
+                    EventType type,
+                    const void* id,
+                    const char* extra) {
+    return Trace(name, -1, type, id, extra, -1);
+  }
+
+  // Retrieves the singleton.
+  // Note that this may return NULL post-AtExit processing.
+  static TraceLog* Get();
+
+  // Returns true iff tracing is turned on.
+  bool IsTracing() {
+    return enable_level() >= TRACE_LEVEL_INFORMATION;
+  }
+
+  // Emit a trace of type |type| containing |name|, |id|, and |extra|.
+  // Note: |name| and |extra| must be NULL, or a zero-terminated string of
+  //    length |name_len| or |extra_len| respectively.
+  // Note: if name_len or extra_len are -1, the length of the corresponding
+  //    string will be used.
+  void TraceEvent(const char* name,
+                  size_t name_len,
+                  EventType type,
+                  const void* id,
+                  const char* extra,
+                  size_t extra_len);
+
+  // Exposed for unittesting only, allows resurrecting our
+  // singleton instance post-AtExit processing.
+  static void Resurrect();
+
+ private:
+  // Ensure only the provider can construct us.
+  friend struct StaticMemorySingletonTraits<TraceLog>;
+  TraceLog();
+
+  DISALLOW_COPY_AND_ASSIGN(TraceLog);
+};
+
+// The ETW trace provider GUID.
+extern const GUID kChromeTraceProviderName;
+
+// The ETW event class GUID for 32 bit events.
+extern const GUID kTraceEventClass32;
+
+// The ETW event class GUID for 64 bit events.
+extern const GUID kTraceEventClass64;
+
+// The ETW event types, IDs 0x00-0x09 are reserved, so start at 0x10.
+const base::win::EtwEventType kTraceEventTypeBegin = 0x10;
+const base::win::EtwEventType kTraceEventTypeEnd = 0x11;
+const base::win::EtwEventType kTraceEventTypeInstant = 0x12;
+
+// If this flag is set in enable flags
+enum TraceEventFlags {
+  CAPTURE_STACK_TRACE = 0x0001,
+};
+
+// The event format consists of:
+// The "name" string as a zero-terminated ASCII string.
+// The id pointer in the machine bitness.
+// The "extra" string as a zero-terminated ASCII string.
+// Optionally the stack trace, consisting of a DWORD "depth", followed
+//    by an array of void* (machine bitness) of length "depth".
+
+// Forward decl.
+struct TraceLogSingletonTraits;
+
+}  // nemspace debug
+}  // namespace base
+
+#endif  // BASE_DEBUG_TRACE_EVENT_WIN_H_