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.
sk_msan_assert_initialized(const void * begin,const void * end)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.
sk_msan_mark_initialized(const void * begin,const void * end,const char * skbug)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