1 //===-- ubsan_init.cc -----------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Initialization of UBSan runtime.
12 //===----------------------------------------------------------------------===//
14 #include "ubsan_init.h"
15 #include "ubsan_flags.h"
16 #include "sanitizer_common/sanitizer_common.h"
17 #include "sanitizer_common/sanitizer_libc.h"
18 #include "sanitizer_common/sanitizer_mutex.h"
19 #include "sanitizer_common/sanitizer_suppressions.h"
20 #include "sanitizer_common/sanitizer_symbolizer.h"
22 using namespace __ubsan;
24 static bool ubsan_inited;
26 void __ubsan::InitIfNecessary() {
27 #if !SANITIZER_CAN_USE_PREINIT_ARRAY
28 // No need to lock mutex if we're initializing from preinit array.
29 static StaticSpinMutex init_mu;
30 SpinMutexLock l(&init_mu);
32 if (LIKELY(ubsan_inited))
34 if (0 == internal_strcmp(SanitizerToolName, "SanitizerTool")) {
35 // WARNING: If this condition holds, then either UBSan runs in a standalone
36 // mode, or initializer for another sanitizer hasn't run yet. In a latter
37 // case, another sanitizer will overwrite "SanitizerToolName" and reparse
38 // common flags. It means, that we are not allowed to *use* common flags
40 SanitizerToolName = "UndefinedBehaviorSanitizer";
41 InitializeCommonFlags();
43 // Initialize UBSan-specific flags.
45 SuppressionContext::InitIfNecessary();
49 #if SANITIZER_CAN_USE_PREINIT_ARRAY
50 __attribute__((section(".preinit_array"), used))
51 void (*__local_ubsan_preinit)(void) = __ubsan::InitIfNecessary;
53 // Use a dynamic initializer.
54 class UbsanInitializer {
60 static UbsanInitializer ubsan_initializer;
61 #endif // SANITIZER_CAN_USE_PREINIT_ARRAY