ubsan_init.cc revision 276789 
1//===-- ubsan_init.cc -----------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Initialization of UBSan runtime.
11//
12//===----------------------------------------------------------------------===//
13
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"
21
22using namespace __ubsan;
23
24static bool ubsan_inited;
25
26void __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);
31#endif
32  if (LIKELY(ubsan_inited))
33   return;
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
39    // in this function.
40    SanitizerToolName = "UndefinedBehaviorSanitizer";
41    InitializeCommonFlags();
42  }
43  // Initialize UBSan-specific flags.
44  InitializeFlags();
45  SuppressionContext::InitIfNecessary();
46  ubsan_inited = true;
47}
48
49#if SANITIZER_CAN_USE_PREINIT_ARRAY
50__attribute__((section(".preinit_array"), used))
51void (*__local_ubsan_preinit)(void) = __ubsan::InitIfNecessary;
52#else
53// Use a dynamic initializer.
54class UbsanInitializer {
55 public:
56  UbsanInitializer() {
57    InitIfNecessary();
58  }
59};
60static UbsanInitializer ubsan_initializer;
61#endif  // SANITIZER_CAN_USE_PREINIT_ARRAY
62