libsanitizer/sanitizer_common/sanitizer_internal_defs.h

   1 //===-- sanitizer_internal_defs.h -------------------------------*- C++ -*-===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is shared between AddressSanitizer and ThreadSanitizer.
   9 // It contains macro used in run-time libraries code.
  10 //===----------------------------------------------------------------------===//
  11 #ifndef SANITIZER_DEFS_H
  12 #define SANITIZER_DEFS_H
  13
  14 #include "sanitizer_platform.h"
  15
  16 #ifndef SANITIZER_DEBUG
  17 # define SANITIZER_DEBUG 0
  18 #endif
  19
  20 // Only use SANITIZER_*ATTRIBUTE* before the function return type!
  21 #if SANITIZER_WINDOWS
  22 #if SANITIZER_IMPORT_INTERFACE
  23 # define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllimport)
  24 #else
  25 # define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllexport)
  26 #endif
  27 # define SANITIZER_WEAK_ATTRIBUTE
  28 #elif SANITIZER_GO
  29 # define SANITIZER_INTERFACE_ATTRIBUTE
  30 # define SANITIZER_WEAK_ATTRIBUTE
  31 #else
  32 # define SANITIZER_INTERFACE_ATTRIBUTE __attribute__((visibility("default")))
  33 # define SANITIZER_WEAK_ATTRIBUTE  __attribute__((weak))
  34 #endif
  35
  36 // TLS is handled differently on different platforms
  37 #if SANITIZER_LINUX
  38 # define SANITIZER_TLS_INITIAL_EXEC_ATTRIBUTE \
  39     __attribute__((tls_model("initial-exec"))) thread_local
  40 #else
  41 # define SANITIZER_TLS_INITIAL_EXEC_ATTRIBUTE
  42 #endif
  43
  44 //--------------------------- WEAK FUNCTIONS ---------------------------------//
  45 // When working with weak functions, to simplify the code and make it more
  46 // portable, when possible define a default implementation using this macro:
  47 //
  48 // SANITIZER_INTERFACE_WEAK_DEF(<return_type>, <name>, <parameter list>)
  49 //
  50 // For example:
  51 //   SANITIZER_INTERFACE_WEAK_DEF(bool, compare, int a, int b) { return a > b; }
  52 //
  53 #if SANITIZER_WINDOWS
  54 #include "sanitizer_win_defs.h"
  55 # define SANITIZER_INTERFACE_WEAK_DEF(ReturnType, Name, ...)                   \
  56   WIN_WEAK_EXPORT_DEF(ReturnType, Name, __VA_ARGS__)
  57 #else
  58 # define SANITIZER_INTERFACE_WEAK_DEF(ReturnType, Name, ...)                   \
  59   extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE            \
  60   ReturnType Name(__VA_ARGS__)
  61 #endif
  62
  63 // SANITIZER_SUPPORTS_WEAK_HOOKS means that we support real weak functions that
  64 // will evaluate to a null pointer when not defined.
  65 #ifndef SANITIZER_SUPPORTS_WEAK_HOOKS
  66 #if SANITIZER_LINUX && !SANITIZER_GO
  67 # define SANITIZER_SUPPORTS_WEAK_HOOKS 1
  68 // Before Xcode 4.5, the Darwin linker doesn't reliably support undefined
  69 // weak symbols.  Mac OS X 10.9/Darwin 13 is the first release only supported
  70 // by Xcode >= 4.5.
  71 #elif SANITIZER_MAC && \
  72     __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1090 && !SANITIZER_GO
  73 # define SANITIZER_SUPPORTS_WEAK_HOOKS 1
  74 #else
  75 # define SANITIZER_SUPPORTS_WEAK_HOOKS 0
  76 #endif
  77 #endif // SANITIZER_SUPPORTS_WEAK_HOOKS
  78 // For some weak hooks that will be called very often and we want to avoid the
  79 // overhead of executing the default implementation when it is not necessary,
  80 // we can use the flag SANITIZER_SUPPORTS_WEAK_HOOKS to only define the default
  81 // implementation for platforms that doesn't support weak symbols. For example:
  82 //
  83 //   #if !SANITIZER_SUPPORT_WEAK_HOOKS
  84 //     SANITIZER_INTERFACE_WEAK_DEF(bool, compare_hook, int a, int b) {
  85 //       return a > b;
  86 //     }
  87 //   #endif
  88 //
  89 // And then use it as: if (compare_hook) compare_hook(a, b);
  90 //----------------------------------------------------------------------------//
  91
  92
  93 // We can use .preinit_array section on Linux to call sanitizer initialization
  94 // functions very early in the process startup (unless PIC macro is defined).
  95 // FIXME: do we have anything like this on Mac?
  96 #if SANITIZER_LINUX && !SANITIZER_ANDROID && !defined(PIC)
  97 # define SANITIZER_CAN_USE_PREINIT_ARRAY 1
  98 #else
  99 # define SANITIZER_CAN_USE_PREINIT_ARRAY 0
 100 #endif
 101
 102 // GCC does not understand __has_feature
 103 #if !defined(__has_feature)
 104 # define __has_feature(x) 0
 105 #endif
 106
 107 // Older GCCs do not understand __has_attribute.
 108 #if !defined(__has_attribute)
 109 # define __has_attribute(x) 0
 110 #endif
 111
 112 // For portability reasons we do not include stddef.h, stdint.h or any other
 113 // system header, but we do need some basic types that are not defined
 114 // in a portable way by the language itself.
 115 namespace __sanitizer {
 116
 117 #if defined(_WIN64)
 118 // 64-bit Windows uses LLP64 data model.
 119 typedef unsigned long long uptr;  // NOLINT
 120 typedef signed   long long sptr;  // NOLINT
 121 #else
 122 typedef unsigned long uptr;  // NOLINT
 123 typedef signed   long sptr;  // NOLINT
 124 #endif  // defined(_WIN64)
 125 #if defined(__x86_64__)
 126 // Since x32 uses ILP32 data model in 64-bit hardware mode, we must use
 127 // 64-bit pointer to unwind stack frame.
 128 typedef unsigned long long uhwptr;  // NOLINT
 129 #else
 130 typedef uptr uhwptr;   // NOLINT
 131 #endif
 132 typedef unsigned char u8;
 133 typedef unsigned short u16;  // NOLINT
 134 typedef unsigned int u32;
 135 typedef unsigned long long u64;  // NOLINT
 136 typedef signed   char s8;
 137 typedef signed   short s16;  // NOLINT
 138 typedef signed   int s32;
 139 typedef signed   long long s64;  // NOLINT
 140 #if SANITIZER_WINDOWS
 141 // On Windows, files are HANDLE, which is a synonim of void*.
 142 // Use void* to avoid including <windows.h> everywhere.
 143 typedef void* fd_t;
 144 typedef unsigned error_t;
 145 #else
 146 typedef int fd_t;
 147 typedef int error_t;
 148 #endif
 149 typedef int pid_t;
 150
 151 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_MAC || \
 152     (SANITIZER_LINUX && defined(__x86_64__))
 153 typedef u64 OFF_T;
 154 #else
 155 typedef uptr OFF_T;
 156 #endif
 157 typedef u64  OFF64_T;
 158
 159 #if (SANITIZER_WORDSIZE == 64) || SANITIZER_MAC
 160 typedef uptr operator_new_size_type;
 161 #else
 162 # if defined(__s390__) && !defined(__s390x__)
 163 // Special case: 31-bit s390 has unsigned long as size_t.
 164 typedef unsigned long operator_new_size_type;
 165 # else
 166 typedef u32 operator_new_size_type;
 167 # endif
 168 #endif
 169
 170 #if SANITIZER_MAC
 171 // On Darwin, thread IDs are 64-bit even on 32-bit systems.
 172 typedef u64 tid_t;
 173 #else
 174 typedef uptr tid_t;
 175 #endif
 176
 177 // ----------- ATTENTION -------------
 178 // This header should NOT include any other headers to avoid portability issues.
 179
 180 // Common defs.
 181 #define INLINE inline
 182 #define INTERFACE_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
 183 #define SANITIZER_WEAK_DEFAULT_IMPL \
 184   extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE
 185 #define SANITIZER_WEAK_CXX_DEFAULT_IMPL \
 186   extern "C++" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE
 187
 188 // Platform-specific defs.
 189 #if defined(_MSC_VER)
 190 # define ALWAYS_INLINE __forceinline
 191 // FIXME(timurrrr): do we need this on Windows?
 192 # define ALIAS(x)
 193 # define ALIGNED(x) __declspec(align(x))
 194 # define FORMAT(f, a)
 195 # define NOINLINE __declspec(noinline)
 196 # define NORETURN __declspec(noreturn)
 197 # define THREADLOCAL   __declspec(thread)
 198 # define LIKELY(x) (x)
 199 # define UNLIKELY(x) (x)
 200 # define PREFETCH(x) /* _mm_prefetch(x, _MM_HINT_NTA) */ (void)0
 201 #else  // _MSC_VER
 202 # define ALWAYS_INLINE inline __attribute__((always_inline))
 203 # define ALIAS(x) __attribute__((alias(x)))
 204 // Please only use the ALIGNED macro before the type.
 205 // Using ALIGNED after the variable declaration is not portable!
 206 # define ALIGNED(x) __attribute__((aligned(x)))
 207 # define FORMAT(f, a)  __attribute__((format(printf, f, a)))
 208 # define NOINLINE __attribute__((noinline))
 209 # define NORETURN  __attribute__((noreturn))
 210 # define THREADLOCAL   __thread
 211 # define LIKELY(x)     __builtin_expect(!!(x), 1)
 212 # define UNLIKELY(x)   __builtin_expect(!!(x), 0)
 213 # if defined(__i386__) || defined(__x86_64__)
 214 // __builtin_prefetch(x) generates prefetchnt0 on x86
 215 #  define PREFETCH(x) __asm__("prefetchnta (%0)" : : "r" (x))
 216 # else
 217 #  define PREFETCH(x) __builtin_prefetch(x)
 218 # endif
 219 #endif  // _MSC_VER
 220
 221 #if !defined(_MSC_VER) || defined(__clang__)
 222 # define UNUSED __attribute__((unused))
 223 # define USED __attribute__((used))
 224 #else
 225 # define UNUSED
 226 # define USED
 227 #endif
 228
 229 #if !defined(_MSC_VER) || defined(__clang__) || MSC_PREREQ(1900)
 230 # define NOEXCEPT noexcept
 231 #else
 232 # define NOEXCEPT throw()
 233 #endif
 234
 235 // Unaligned versions of basic types.
 236 typedef ALIGNED(1) u16 uu16;
 237 typedef ALIGNED(1) u32 uu32;
 238 typedef ALIGNED(1) u64 uu64;
 239 typedef ALIGNED(1) s16 us16;
 240 typedef ALIGNED(1) s32 us32;
 241 typedef ALIGNED(1) s64 us64;
 242
 243 #if SANITIZER_WINDOWS
 244 }  // namespace __sanitizer
 245 typedef unsigned long DWORD;  // NOLINT
 246 namespace __sanitizer {
 247 typedef DWORD thread_return_t;
 248 # define THREAD_CALLING_CONV __stdcall
 249 #else  // _WIN32
 250 typedef void* thread_return_t;
 251 # define THREAD_CALLING_CONV
 252 #endif  // _WIN32
 253 typedef thread_return_t (THREAD_CALLING_CONV *thread_callback_t)(void* arg);
 254
 255 // NOTE: Functions below must be defined in each run-time.
 256 void NORETURN Die();
 257
 258 // FIXME: No, this shouldn't be in the sanitizer interface.
 259 SANITIZER_INTERFACE_ATTRIBUTE
 260 void NORETURN CheckFailed(const char *file, int line, const char *cond,
 261                           u64 v1, u64 v2);
 262
 263 // Check macro
 264 #define RAW_CHECK_MSG(expr, msg) do { \
 265   if (UNLIKELY(!(expr))) { \
 266     RawWrite(msg); \
 267     Die(); \
 268   } \
 269 } while (0)
 270
 271 #define RAW_CHECK(expr) RAW_CHECK_MSG(expr, #expr)
 272
 273 #define CHECK_IMPL(c1, op, c2) \
 274   do { \
 275     __sanitizer::u64 v1 = (__sanitizer::u64)(c1); \
 276     __sanitizer::u64 v2 = (__sanitizer::u64)(c2); \
 277     if (UNLIKELY(!(v1 op v2))) \
 278       __sanitizer::CheckFailed(__FILE__, __LINE__, \
 279         "(" #c1 ") " #op " (" #c2 ")", v1, v2); \
 280   } while (false) \
 281 /**/
 282
 283 #define CHECK(a)       CHECK_IMPL((a), !=, 0)
 284 #define CHECK_EQ(a, b) CHECK_IMPL((a), ==, (b))
 285 #define CHECK_NE(a, b) CHECK_IMPL((a), !=, (b))
 286 #define CHECK_LT(a, b) CHECK_IMPL((a), <,  (b))
 287 #define CHECK_LE(a, b) CHECK_IMPL((a), <=, (b))
 288 #define CHECK_GT(a, b) CHECK_IMPL((a), >,  (b))
 289 #define CHECK_GE(a, b) CHECK_IMPL((a), >=, (b))
 290
 291 #if SANITIZER_DEBUG
 292 #define DCHECK(a)       CHECK(a)
 293 #define DCHECK_EQ(a, b) CHECK_EQ(a, b)
 294 #define DCHECK_NE(a, b) CHECK_NE(a, b)
 295 #define DCHECK_LT(a, b) CHECK_LT(a, b)
 296 #define DCHECK_LE(a, b) CHECK_LE(a, b)
 297 #define DCHECK_GT(a, b) CHECK_GT(a, b)
 298 #define DCHECK_GE(a, b) CHECK_GE(a, b)
 299 #else
 300 #define DCHECK(a)
 301 #define DCHECK_EQ(a, b)
 302 #define DCHECK_NE(a, b)
 303 #define DCHECK_LT(a, b)
 304 #define DCHECK_LE(a, b)
 305 #define DCHECK_GT(a, b)
 306 #define DCHECK_GE(a, b)
 307 #endif
 308
 309 #define UNREACHABLE(msg) do { \
 310   CHECK(0 && msg); \
 311   Die(); \
 312 } while (0)
 313
 314 #define UNIMPLEMENTED() UNREACHABLE("unimplemented")
 315
 316 #define COMPILER_CHECK(pred) IMPL_COMPILER_ASSERT(pred, __LINE__)
 317
 318 #define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
 319
 320 #define IMPL_PASTE(a, b) a##b
 321 #define IMPL_COMPILER_ASSERT(pred, line) \
 322     typedef char IMPL_PASTE(assertion_failed_##_, line)[2*(int)(pred)-1]
 323
 324 // Limits for integral types. We have to redefine it in case we don't
 325 // have stdint.h (like in Visual Studio 9).
 326 #undef __INT64_C
 327 #undef __UINT64_C
 328 #if SANITIZER_WORDSIZE == 64
 329 # define __INT64_C(c)  c ## L
 330 # define __UINT64_C(c) c ## UL
 331 #else
 332 # define __INT64_C(c)  c ## LL
 333 # define __UINT64_C(c) c ## ULL
 334 #endif  // SANITIZER_WORDSIZE == 64
 335 #undef INT32_MIN
 336 #define INT32_MIN              (-2147483647-1)
 337 #undef INT32_MAX
 338 #define INT32_MAX              (2147483647)
 339 #undef UINT32_MAX
 340 #define UINT32_MAX             (4294967295U)
 341 #undef INT64_MIN
 342 #define INT64_MIN              (-__INT64_C(9223372036854775807)-1)
 343 #undef INT64_MAX
 344 #define INT64_MAX              (__INT64_C(9223372036854775807))
 345 #undef UINT64_MAX
 346 #define UINT64_MAX             (__UINT64_C(18446744073709551615))
 347
 348 enum LinkerInitialized { LINKER_INITIALIZED = 0 };
 349
 350 #if !defined(_MSC_VER) || defined(__clang__)
 351 #if SANITIZER_S390_31
 352 #define GET_CALLER_PC() \
 353   (__sanitizer::uptr) __builtin_extract_return_addr(__builtin_return_address(0))
 354 #else
 355 #define GET_CALLER_PC() (__sanitizer::uptr) __builtin_return_address(0)
 356 #endif
 357 #define GET_CURRENT_FRAME() (__sanitizer::uptr) __builtin_frame_address(0)
 358 inline void Trap() {
 359   __builtin_trap();
 360 }
 361 #else
 362 extern "C" void* _ReturnAddress(void);
 363 extern "C" void* _AddressOfReturnAddress(void);
 364 # pragma intrinsic(_ReturnAddress)
 365 # pragma intrinsic(_AddressOfReturnAddress)
 366 #define GET_CALLER_PC() (__sanitizer::uptr) _ReturnAddress()
 367 // CaptureStackBackTrace doesn't need to know BP on Windows.
 368 #define GET_CURRENT_FRAME() \
 369   (((__sanitizer::uptr)_AddressOfReturnAddress()) + sizeof(__sanitizer::uptr))
 370
 371 extern "C" void __ud2(void);
 372 # pragma intrinsic(__ud2)
 373 inline void Trap() {
 374   __ud2();
 375 }
 376 #endif
 377
 378 #define HANDLE_EINTR(res, f)                                       \
 379   {                                                                \
 380     int rverrno;                                                   \
 381     do {                                                           \
 382       res = (f);                                                   \
 383     } while (internal_iserror(res, &rverrno) && rverrno == EINTR); \
 384   }
 385
 386 // Forces the compiler to generate a frame pointer in the function.
 387 #define ENABLE_FRAME_POINTER              \
 388   do {                                    \
 389     volatile __sanitizer::uptr enable_fp; \
 390     enable_fp = GET_CURRENT_FRAME();      \
 391     (void)enable_fp;                      \
 392   } while (0)
 393
 394 }  // namespace __sanitizer
 395
 396 namespace __asan  { using namespace __sanitizer; }  // NOLINT
 397 namespace __dsan  { using namespace __sanitizer; }  // NOLINT
 398 namespace __dfsan { using namespace __sanitizer; }  // NOLINT
 399 namespace __esan  { using namespace __sanitizer; }  // NOLINT
 400 namespace __lsan  { using namespace __sanitizer; }  // NOLINT
 401 namespace __msan  { using namespace __sanitizer; }  // NOLINT
 402 namespace __tsan  { using namespace __sanitizer; }  // NOLINT
 403 namespace __scudo { using namespace __sanitizer; }  // NOLINT
 404 namespace __ubsan { using namespace __sanitizer; }  // NOLINT
 405 namespace __xray  { using namespace __sanitizer; }  // NOLINT
 406 namespace __interception  { using namespace __sanitizer; }  // NOLINT
 407
 408
 409 #endif  // SANITIZER_DEFS_H