1 //===-- tsan_defs.h ---------------------------------------------*- C++ -*-===//
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 // This file is a part of ThreadSanitizer (TSan), a race detector.
12 //===----------------------------------------------------------------------===//
17 #include "sanitizer_common/sanitizer_internal_defs.h"
18 #include "sanitizer_common/sanitizer_libc.h"
19 #include "tsan_stat.h"
28 const bool kGoMode = true;
29 const bool kCppMode = false;
30 const char *const kTsanOptionsEnv = "GORACE";
31 // Go linker does not support weak symbols.
34 const bool kGoMode = false;
35 const bool kCppMode = true;
36 const char *const kTsanOptionsEnv = "TSAN_OPTIONS";
40 const int kTidBits = 13;
41 const unsigned kMaxTid = 1 << kTidBits;
42 const unsigned kMaxTidInClock = kMaxTid * 2; // This includes msb 'freed' bit.
43 const int kClkBits = 42;
44 const unsigned kMaxTidReuse = (1 << (64 - kClkBits)) - 1;
45 const uptr kShadowStackSize = 64 * 1024;
47 #ifdef TSAN_SHADOW_COUNT
48 # if TSAN_SHADOW_COUNT == 2 \
49 || TSAN_SHADOW_COUNT == 4 || TSAN_SHADOW_COUNT == 8
50 const uptr kShadowCnt = TSAN_SHADOW_COUNT;
52 # error "TSAN_SHADOW_COUNT must be one of 2,4,8"
55 // Count of shadow values in a shadow cell.
56 #define TSAN_SHADOW_COUNT 4
57 const uptr kShadowCnt = 4;
60 // That many user bytes are mapped onto a single shadow cell.
61 const uptr kShadowCell = 8;
63 // Size of a single shadow value (u64).
64 const uptr kShadowSize = 8;
66 // Shadow memory is kShadowMultiplier times larger than user memory.
67 const uptr kShadowMultiplier = kShadowSize * kShadowCnt / kShadowCell;
69 // That many user bytes are mapped onto a single meta shadow cell.
70 // Must be less or equal to minimal memory allocator alignment.
71 const uptr kMetaShadowCell = 8;
73 // Size of a single meta shadow value (u32).
74 const uptr kMetaShadowSize = 4;
76 #if defined(TSAN_NO_HISTORY) && TSAN_NO_HISTORY
77 const bool kCollectHistory = false;
79 const bool kCollectHistory = true;
82 #if defined(TSAN_COLLECT_STATS) && TSAN_COLLECT_STATS
83 const bool kCollectStats = true;
85 const bool kCollectStats = false;
88 // The following "build consistency" machinery ensures that all source files
89 // are built in the same configuration. Inconsistent builds lead to
90 // hard to debug crashes.
92 void build_consistency_debug();
94 void build_consistency_release();
97 #if TSAN_COLLECT_STATS
98 void build_consistency_stats();
100 void build_consistency_nostats();
103 #if TSAN_SHADOW_COUNT == 1
104 void build_consistency_shadow1();
105 #elif TSAN_SHADOW_COUNT == 2
106 void build_consistency_shadow2();
107 #elif TSAN_SHADOW_COUNT == 4
108 void build_consistency_shadow4();
110 void build_consistency_shadow8();
113 static inline void USED build_consistency() {
115 build_consistency_debug();
117 build_consistency_release();
119 #if TSAN_COLLECT_STATS
120 build_consistency_stats();
122 build_consistency_nostats();
124 #if TSAN_SHADOW_COUNT == 1
125 build_consistency_shadow1();
126 #elif TSAN_SHADOW_COUNT == 2
127 build_consistency_shadow2();
128 #elif TSAN_SHADOW_COUNT == 4
129 build_consistency_shadow4();
131 build_consistency_shadow8();
137 return a < b ? a : b;
142 return a > b ? a : b;
146 T RoundUp(T p, u64 align) {
147 DCHECK_EQ(align & (align - 1), 0);
148 return (T)(((u64)p + align - 1) & ~(align - 1));
152 T RoundDown(T p, u64 align) {
153 DCHECK_EQ(align & (align - 1), 0);
154 return (T)((u64)p & ~(align - 1));
157 // Zeroizes high part, returns 'bits' lsb bits.
159 T GetLsb(T v, int bits) {
160 return (T)((u64)v & ((1ull << bits) - 1));
165 bool operator==(const MD5Hash &other) const;
168 MD5Hash md5_hash(const void *data, uptr size);
177 // Descriptor of user's memory block.
184 COMPILER_CHECK(sizeof(MBlock) == 16);
186 } // namespace __tsan
188 #endif // TSAN_DEFS_H