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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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ */
+
+#ifndef WTF_DynamicAnnotations_h
+#define WTF_DynamicAnnotations_h
+
+/* This file defines dynamic annotations for use with dynamic analysis
+ * tool such as ThreadSanitizer, Valgrind, etc.
+ *
+ * Dynamic annotation is a source code annotation that affects
+ * the generated code (that is, the annotation is not a comment).
+ * Each such annotation is attached to a particular
+ * instruction and/or to a particular object (address) in the program.
+ *
+ * By using dynamic annotations a developer can give more details to the dynamic
+ * analysis tool to improve its precision.
+ *
+ * In C/C++ program the annotations are represented as C macros.
+ * With the default build flags, these macros are empty, hence don't affect
+ * performance of a compiled binary.
+ * If dynamic annotations are enabled, they just call no-op functions.
+ * The dynamic analysis tools can intercept these functions and replace them
+ * with their own implementations.
+ *
+ * See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations for more information.
+ */
+
+#if USE(DYNAMIC_ANNOTATIONS)
+/* Tell data race detector that we're not interested in reports on the given address range. */
+#define WTF_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) WTFAnnotateBenignRaceSized(__FILE__, __LINE__, address, size, description)
+#define WTF_ANNOTATE_BENIGN_RACE(pointer, description) WTFAnnotateBenignRaceSized(__FILE__, __LINE__, pointer, sizeof(*(pointer)), description)
+
+/* Annotations for user-defined synchronization mechanisms.
+ * These annotations can be used to define happens-before arcs in user-defined
+ * synchronization mechanisms: the race detector will infer an arc from
+ * the former to the latter when they share the same argument pointer.
+ *
+ * The most common case requiring annotations is atomic reference counting:
+ * bool deref() {
+ *     ANNOTATE_HAPPENS_BEFORE(&m_refCount);
+ *     if (!atomicDecrement(&m_refCount)) {
+ *         // m_refCount is now 0
+ *         ANNOTATE_HAPPENS_AFTER(&m_refCount);
+ *         // "return true; happens-after each atomicDecrement of m_refCount"
+ *         return true;
+ *     }
+ *     return false;
+ * }
+ */
+#define WTF_ANNOTATE_HAPPENS_BEFORE(address) WTFAnnotateHappensBefore(__FILE__, __LINE__, address)
+#define WTF_ANNOTATE_HAPPENS_AFTER(address) WTFAnnotateHappensAfter(__FILE__, __LINE__, address)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/* Don't use these directly, use the above macros instead. */
+void WTFAnnotateBenignRaceSized(const char* file, int line, const volatile void* memory, long size, const char* description);
+void WTFAnnotateHappensBefore(const char* file, int line, const volatile void* address);
+void WTFAnnotateHappensAfter(const char* file, int line, const volatile void* address);
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#else // USE(DYNAMIC_ANNOTATIONS)
+/* These macros are empty when dynamic annotations are not enabled so you can
+ * use them without affecting the performance of release binaries. */
+#define WTF_ANNOTATE_BENIGN_RACE_SIZED(address, size, description)
+#define WTF_ANNOTATE_BENIGN_RACE(pointer, description)
+#define WTF_ANNOTATE_HAPPENS_BEFORE(address)
+#define WTF_ANNOTATE_HAPPENS_AFTER(address)
+#endif // USE(DYNAMIC_ANNOTATIONS)
+
+#endif // WTF_DynamicAnnotations_h