Print additional message for RELEASE_ASSERT in builds used for fuzzing.

third_party/WebKit/Source/wtf/Assertions.h

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 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
@@ skipping 271 matching lines @@
 #endif
 
 /* RELEASE_ASSERT
 
    Use in places where failure of an assertion indicates a definite security
    vulnerability from which execution must not continue even in a release build.
    Please sure to file bugs for these failures using the security template:
       http://code.google.com/p/chromium/issues/entry?template=Security%20Bug
 */
 // RELEASE_ASSERT is deprecated.  We should use CHECK() instead.
+#if defined(ADDRESS_SANITIZER)

[inferno, 2016/08/12 17:43:56]

This should come after #if ENABLE(ASSERT) block in an #elif (don't need an outer
#if #endif. For debug builds, we don't want to change behavior.

+#define RELEASE_ASSERT_FOR_FUZZING() do { \
+    WTFLogAlways("RELEASE_ASSERT failed.\n"); \

[inferno, 2016/08/12 17:43:56]

We would need to get condition failed and stacktrace. can you check if
"LOG_IF(FATAL, !(condition)) << "Release assert failed: " #condition ". "" code
does it. See also line 264 where it is used.

+    IMMEDIATE_CRASH(); \
+} while (0)
+#define RELEASE_ASSERT(assertion) (UNLIKELY(!(assertion)) ? (RELEASE_ASSERT_FOR_FUZZING()) : (void)0)
+#else // defined(ADDRESS_SANITIZER)
 #if ENABLE(ASSERT)
 #define RELEASE_ASSERT(assertion) ASSERT(assertion)
 #else
 #define RELEASE_ASSERT(assertion) (UNLIKELY(!(assertion)) ? (IMMEDIATE_CRASH()) : (void)0)
 #endif
+#endif // defined(ADDRESS_SANITIZER)
 // TODO(tkent): Move this to base/logging.h?
 #define RELEASE_NOTREACHED() LOG(FATAL)
 
 /* DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES */
 
 // Allow equality comparisons of Objects by reference or pointer, interchangeably.
 // This can be only used on types whose equality makes no other sense than pointer equality.
 #define DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(thisType) \
     inline bool operator==(const thisType& a, const thisType& b) { return &a == &b; } \
     inline bool operator==(const thisType& a, const thisType* b) { return &a == b; } \
@@ skipping 29 matching lines @@
 } \
 inline const thisType& to##thisType(const argumentType& argumentName) \
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(referencePredicate); \
     return static_cast<const thisType&>(argumentName); \
 } \
 void to##thisType(const thisType*); \
 void to##thisType(const thisType&)
 
 #endif /* WTF_Assertions_h */