[blink]: Annotate StringImpl::createStatic leak for LeakSanitizer.

Source/wtf/LeakAnnotations.h

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2013 Samsung Electronics. 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.
+ */
+
+#ifndef WTF_LeakAnnotations_h
+#define WTF_LeakAnnotations_h
+
+/* This file defines macros which can be used to annotate intentional memory
+ * leaks. Support for annotations is implemented in HeapChecker and
+ * LeakSanitizer. Annotated objects will be treated as a source of live
+ * pointers, i.e. any heap objects reachable by following pointers from an
+ * annotated object will not be reported as leaks.
+ *
+ * ANNOTATE_SCOPED_MEMORY_LEAK: all allocations made in the current scope
+ * will be annotated as leaks.
+ * ANNOTATE_LEAKING_OBJECT_PTR(X): the heap object referenced by pointer X will
+ * be annotated as a leak.
+ *
+ * Note that HeapChecker will report a fatal error if an object which has been
+ * annotated with ANNOTATE_LEAKING_OBJECT_PTR is later deleted (but
+ * LeakSanitizer won't).
+ */
+
+#if USE(LEAK_ANNOTATIONS)
+
+#if USE(LEAK_SANITIZER)
+#ifdef __cplusplus

[earthdok, 2013/09/04 13:43:00]

Isn't this always true? We have C++ code below anyway.

+extern "C" {
+#endif
+void __lsan_disable();
+void __lsan_enable();
+void __lsan_ignore_object(const void *p);
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+class WTFLeakSanitizerDisabler {

[earthdok, 2013/09/04 13:43:00]

Disallow copy and assign.

+public:
+    WTFLeakSanitizerDisabler()
+    {
+        __lsan_disable();
+    }
+
+    ~WTFLeakSanitizerDisabler()
+    {
+        __lsan_enable();
+    }
+};
+
+#define WTF_ANNOTATE_SCOPED_MEMORY_LEAK \
+    WTFLeakSanitizerDisabler leakSanitizerDisabler; static_cast<void>(0)
+
+#define WTF_ANNOTATE_LEAKING_OBJECT_PTR(X) __lsan_ignore_object(X);

[earthdok, 2013/09/04 13:43:00]

Nit: don't need the semicolon here.

+
+#else // USE(LEAK_SANITIZER)
+
+// If Leak Sanitizer is not being used, the annotations should be no-ops.
+#define WTF_ANNOTATE_SCOPED_MEMORY_LEAK ((void)0)
+#define WTF_ANNOTATE_LEAKING_OBJECT_PTR(X) ((void)0)
+
+#endif // USE(LEAK_SANITIZER)
+
+#endif // USE(LEAK_ANNOTATIONS)
+
+#endif // WTF_LeakAnnotations_h