1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkMSAN_DEFINED 9 #define SkMSAN_DEFINED 10 11 #include "SkTypes.h" 12 13 // Typically declared in LLVM's msan_interface.h. Easier for us to just re-declare. 14 extern "C" { 15 void __msan_check_mem_is_initialized(const volatile void*, size_t); 16 void __msan_unpoison (const volatile void*, size_t); 17 } 18 19 // Code that requires initialized inputs can call this to make it clear that 20 // the blame for use of uninitialized data belongs further up the call stack. 21 static inline void sk_msan_assert_initialized(const void* begin, const void* end) { 22 #if defined(__has_feature) 23 #if __has_feature(memory_sanitizer) 24 __msan_check_mem_is_initialized(begin, (const char*)end - (const char*)begin); 25 #endif 26 #endif 27 } 28 29 // Lie to MSAN that this range of memory is initialized. 30 // This can hide serious problems if overused. Every use of this should refer to a bug. 31 static inline void sk_msan_mark_initialized(const void* begin, const void* end, const char* skbug) { 32 SkASSERT(skbug && 0 != strcmp(skbug, "")); 33 #if defined(__has_feature) 34 #if __has_feature(memory_sanitizer) 35 __msan_unpoison(begin, (const char*)end - (const char*)begin); 36 #endif 37 #endif 38 } 39 40 #endif//SkMSAN_DEFINED 41
