1//===-- sanitizer_internal_defs.h -------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is shared between AddressSanitizer and ThreadSanitizer.
10// It contains macro used in run-time libraries code.
11//===----------------------------------------------------------------------===//
12#ifndef SANITIZER_DEFS_H
13#define SANITIZER_DEFS_H
14
15#include "sanitizer_platform.h"
16#include "sanitizer_redefine_builtins.h"
17
18// GCC does not understand __has_feature.
19#if !defined(__has_feature)
20#define __has_feature(x) 0
21#endif
22
23#ifndef SANITIZER_DEBUG
24# define SANITIZER_DEBUG 0
25#endif
26
27#define SANITIZER_STRINGIFY_(S) #S
28#define SANITIZER_STRINGIFY(S) SANITIZER_STRINGIFY_(S)
29
30// Only use SANITIZER_*ATTRIBUTE* before the function return type!
31#if SANITIZER_WINDOWS
32#if SANITIZER_IMPORT_INTERFACE
33# define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllimport)
34#else
35# define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllexport)
36#endif
37# define SANITIZER_WEAK_ATTRIBUTE
38# define SANITIZER_WEAK_IMPORT
39#elif SANITIZER_GO
40# define SANITIZER_INTERFACE_ATTRIBUTE
41# define SANITIZER_WEAK_ATTRIBUTE
42# define SANITIZER_WEAK_IMPORT
43#else
44# define SANITIZER_INTERFACE_ATTRIBUTE __attribute__((visibility("default")))
45# define SANITIZER_WEAK_ATTRIBUTE __attribute__((weak))
46# if SANITIZER_APPLE
47# define SANITIZER_WEAK_IMPORT extern "C" __attribute((weak_import))
48# else
49# define SANITIZER_WEAK_IMPORT extern "C" SANITIZER_WEAK_ATTRIBUTE
50# endif // SANITIZER_APPLE
51#endif // SANITIZER_WINDOWS
52
53//--------------------------- WEAK FUNCTIONS ---------------------------------//
54// When working with weak functions, to simplify the code and make it more
55// portable, when possible define a default implementation using this macro:
56//
57// SANITIZER_INTERFACE_WEAK_DEF(<return_type>, <name>, <parameter list>)
58//
59// For example:
60// SANITIZER_INTERFACE_WEAK_DEF(bool, compare, int a, int b) { return a > b; }
61//
62#if SANITIZER_WINDOWS
63#include "sanitizer_win_defs.h"
64# define SANITIZER_INTERFACE_WEAK_DEF(ReturnType, Name, ...) \
65 WIN_WEAK_EXPORT_DEF(ReturnType, Name, __VA_ARGS__)
66#else
67# define SANITIZER_INTERFACE_WEAK_DEF(ReturnType, Name, ...) \
68 extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE \
69 ReturnType Name(__VA_ARGS__)
70#endif
71
72// SANITIZER_SUPPORTS_WEAK_HOOKS means that we support real weak functions that
73// will evaluate to a null pointer when not defined.
74#ifndef SANITIZER_SUPPORTS_WEAK_HOOKS
75#if (SANITIZER_LINUX || SANITIZER_SOLARIS) && !SANITIZER_GO
76# define SANITIZER_SUPPORTS_WEAK_HOOKS 1
77// Before Xcode 4.5, the Darwin linker doesn't reliably support undefined
78// weak symbols. Mac OS X 10.9/Darwin 13 is the first release only supported
79// by Xcode >= 4.5.
80#elif SANITIZER_APPLE && \
81 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1090 && !SANITIZER_GO
82# define SANITIZER_SUPPORTS_WEAK_HOOKS 1
83#else
84# define SANITIZER_SUPPORTS_WEAK_HOOKS 0
85#endif
86#endif // SANITIZER_SUPPORTS_WEAK_HOOKS
87// For some weak hooks that will be called very often and we want to avoid the
88// overhead of executing the default implementation when it is not necessary,
89// we can use the flag SANITIZER_SUPPORTS_WEAK_HOOKS to only define the default
90// implementation for platforms that doesn't support weak symbols. For example:
91//
92// #if !SANITIZER_SUPPORT_WEAK_HOOKS
93// SANITIZER_INTERFACE_WEAK_DEF(bool, compare_hook, int a, int b) {
94// return a > b;
95// }
96// #endif
97//
98// And then use it as: if (compare_hook) compare_hook(a, b);
99//----------------------------------------------------------------------------//
100
101
102// We can use .preinit_array section on Linux to call sanitizer initialization
103// functions very early in the process startup (unless PIC macro is defined).
104//
105// On FreeBSD, .preinit_array functions are called with rtld_bind_lock writer
106// lock held. It will lead to dead lock if unresolved PLT functions (which helds
107// rtld_bind_lock reader lock) are called inside .preinit_array functions.
108//
109// FIXME: do we have anything like this on Mac?
110#ifndef SANITIZER_CAN_USE_PREINIT_ARRAY
111#if (SANITIZER_LINUX || SANITIZER_FUCHSIA || SANITIZER_NETBSD) && !defined(PIC)
112#define SANITIZER_CAN_USE_PREINIT_ARRAY 1
113// Before Solaris 11.4, .preinit_array is fully supported only with GNU ld.
114// FIXME: Check for those conditions.
115#elif SANITIZER_SOLARIS && !defined(PIC)
116# define SANITIZER_CAN_USE_PREINIT_ARRAY 1
117#else
118# define SANITIZER_CAN_USE_PREINIT_ARRAY 0
119#endif
120#endif // SANITIZER_CAN_USE_PREINIT_ARRAY
121
122// GCC does not understand __has_feature
123#if !defined(__has_feature)
124# define __has_feature(x) 0
125#endif
126
127// Older GCCs do not understand __has_attribute.
128#if !defined(__has_attribute)
129# define __has_attribute(x) 0
130#endif
131
132#if !defined(__has_cpp_attribute)
133# define __has_cpp_attribute(x) 0
134#endif
135
136// For portability reasons we do not include stddef.h, stdint.h or any other
137// system header, but we do need some basic types that are not defined
138// in a portable way by the language itself.
139namespace __sanitizer {
140
141#if defined(_WIN64)
142// 64-bit Windows uses LLP64 data model.
143typedef unsigned long long uptr;
144typedef signed long long sptr;
145#else
146# if (SANITIZER_WORDSIZE == 64) || SANITIZER_APPLE || SANITIZER_WINDOWS
147typedef unsigned long uptr;
148typedef signed long sptr;
149# else
150typedef unsigned int uptr;
151typedef signed int sptr;
152# endif
153#endif // defined(_WIN64)
154#if defined(__x86_64__)
155// Since x32 uses ILP32 data model in 64-bit hardware mode, we must use
156// 64-bit pointer to unwind stack frame.
157typedef unsigned long long uhwptr;
158#else
159typedef uptr uhwptr;
160#endif
161typedef unsigned char u8;
162typedef unsigned short u16;
163typedef unsigned int u32;
164typedef unsigned long long u64;
165typedef signed char s8;
166typedef signed short s16;
167typedef signed int s32;
168typedef signed long long s64;
169#if SANITIZER_WINDOWS
170// On Windows, files are HANDLE, which is a synonim of void*.
171// Use void* to avoid including <windows.h> everywhere.
172typedef void* fd_t;
173typedef unsigned error_t;
174#else
175typedef int fd_t;
176typedef int error_t;
177#endif
178#if SANITIZER_SOLARIS && !defined(_LP64)
179typedef long pid_t;
180#else
181typedef int pid_t;
182#endif
183
184#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_APPLE || \
185 (SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)) || \
186 (SANITIZER_LINUX && !SANITIZER_GLIBC && !SANITIZER_ANDROID) || \
187 (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__)))
188typedef u64 OFF_T;
189#else
190typedef uptr OFF_T;
191#endif
192typedef u64 OFF64_T;
193
194#ifdef __SIZE_TYPE__
195typedef __SIZE_TYPE__ usize;
196#else
197typedef uptr usize;
198#endif
199
200typedef u64 tid_t;
201
202// ----------- ATTENTION -------------
203// This header should NOT include any other headers to avoid portability issues.
204
205// Common defs.
206#define INTERFACE_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
207#define SANITIZER_WEAK_DEFAULT_IMPL \
208 extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE
209#define SANITIZER_WEAK_CXX_DEFAULT_IMPL \
210 extern "C++" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE
211
212// Platform-specific defs.
213#if defined(_MSC_VER)
214# define ALWAYS_INLINE __forceinline
215// FIXME(timurrrr): do we need this on Windows?
216# define ALIAS(x)
217# define ALIGNED(x) __declspec(align(x))
218# define FORMAT(f, a)
219# define NOINLINE __declspec(noinline)
220# define NORETURN __declspec(noreturn)
221# define THREADLOCAL __declspec(thread)
222# define LIKELY(x) (x)
223# define UNLIKELY(x) (x)
224# define PREFETCH(x) /* _mm_prefetch(x, _MM_HINT_NTA) */ (void)0
225# define WARN_UNUSED_RESULT
226#else // _MSC_VER
227# define ALWAYS_INLINE inline __attribute__((always_inline))
228# define ALIAS(x) __attribute__((alias(SANITIZER_STRINGIFY(x))))
229// Please only use the ALIGNED macro before the type.
230// Using ALIGNED after the variable declaration is not portable!
231# define ALIGNED(x) __attribute__((aligned(x)))
232# define FORMAT(f, a) __attribute__((format(printf, f, a)))
233# define NOINLINE __attribute__((noinline))
234# define NORETURN __attribute__((noreturn))
235# define THREADLOCAL __thread
236# define LIKELY(x) __builtin_expect(!!(x), 1)
237# define UNLIKELY(x) __builtin_expect(!!(x), 0)
238# if defined(__i386__) || defined(__x86_64__)
239// __builtin_prefetch(x) generates prefetchnt0 on x86
240# define PREFETCH(x) __asm__("prefetchnta (%0)" : : "r" (x))
241# else
242# define PREFETCH(x) __builtin_prefetch(x)
243# endif
244# define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
245#endif // _MSC_VER
246
247#if !defined(_MSC_VER) || defined(__clang__)
248# define UNUSED __attribute__((unused))
249# define USED __attribute__((used))
250#else
251# define UNUSED
252# define USED
253#endif
254
255#if !defined(_MSC_VER) || defined(__clang__) || MSC_PREREQ(1900)
256# define NOEXCEPT noexcept
257#else
258# define NOEXCEPT throw()
259#endif
260
261#if __has_cpp_attribute(clang::fallthrough)
262# define FALLTHROUGH [[clang::fallthrough]]
263#elif __has_cpp_attribute(fallthrough)
264# define FALLTHROUGH [[fallthrough]]
265#else
266# define FALLTHROUGH
267#endif
268
269#if __has_attribute(uninitialized)
270# define UNINITIALIZED __attribute__((uninitialized))
271#else
272# define UNINITIALIZED
273#endif
274
275// Unaligned versions of basic types.
276typedef ALIGNED(1) u16 uu16;
277typedef ALIGNED(1) u32 uu32;
278typedef ALIGNED(1) u64 uu64;
279typedef ALIGNED(1) s16 us16;
280typedef ALIGNED(1) s32 us32;
281typedef ALIGNED(1) s64 us64;
282
283#if SANITIZER_WINDOWS
284} // namespace __sanitizer
285typedef unsigned long DWORD;
286namespace __sanitizer {
287typedef DWORD thread_return_t;
288# define THREAD_CALLING_CONV __stdcall
289#else // _WIN32
290typedef void* thread_return_t;
291# define THREAD_CALLING_CONV
292#endif // _WIN32
293typedef thread_return_t (THREAD_CALLING_CONV *thread_callback_t)(void* arg);
294
295// NOTE: Functions below must be defined in each run-time.
296void NORETURN Die();
297
298void NORETURN CheckFailed(const char *file, int line, const char *cond,
299 u64 v1, u64 v2);
300
301// Check macro
302#define RAW_CHECK_MSG(expr, msg, ...) \
303 do { \
304 if (UNLIKELY(!(expr))) { \
305 const char* msgs[] = {msg, __VA_ARGS__}; \
306 for (const char* m : msgs) RawWrite(m); \
307 Die(); \
308 } \
309 } while (0)
310
311#define RAW_CHECK(expr) RAW_CHECK_MSG(expr, #expr "\n", )
312#define RAW_CHECK_VA(expr, ...) RAW_CHECK_MSG(expr, #expr "\n", __VA_ARGS__)
313
314#define CHECK_IMPL(c1, op, c2) \
315 do { \
316 __sanitizer::u64 v1 = (__sanitizer::u64)(c1); \
317 __sanitizer::u64 v2 = (__sanitizer::u64)(c2); \
318 if (UNLIKELY(!(v1 op v2))) \
319 __sanitizer::CheckFailed(__FILE__, __LINE__, \
320 "(" #c1 ") " #op " (" #c2 ")", v1, v2); \
321 } while (false) \
322/**/
323
324#define CHECK(a) CHECK_IMPL((a), !=, 0)
325#define CHECK_EQ(a, b) CHECK_IMPL((a), ==, (b))
326#define CHECK_NE(a, b) CHECK_IMPL((a), !=, (b))
327#define CHECK_LT(a, b) CHECK_IMPL((a), <, (b))
328#define CHECK_LE(a, b) CHECK_IMPL((a), <=, (b))
329#define CHECK_GT(a, b) CHECK_IMPL((a), >, (b))
330#define CHECK_GE(a, b) CHECK_IMPL((a), >=, (b))
331
332#if SANITIZER_DEBUG
333#define DCHECK(a) CHECK(a)
334#define DCHECK_EQ(a, b) CHECK_EQ(a, b)
335#define DCHECK_NE(a, b) CHECK_NE(a, b)
336#define DCHECK_LT(a, b) CHECK_LT(a, b)
337#define DCHECK_LE(a, b) CHECK_LE(a, b)
338#define DCHECK_GT(a, b) CHECK_GT(a, b)
339#define DCHECK_GE(a, b) CHECK_GE(a, b)
340#else
341#define DCHECK(a)
342#define DCHECK_EQ(a, b)
343#define DCHECK_NE(a, b)
344#define DCHECK_LT(a, b)
345#define DCHECK_LE(a, b)
346#define DCHECK_GT(a, b)
347#define DCHECK_GE(a, b)
348#endif
349
350#define UNREACHABLE(msg) do { \
351 CHECK(0 && msg); \
352 Die(); \
353} while (0)
354
355#define UNIMPLEMENTED() UNREACHABLE("unimplemented")
356
357#define COMPILER_CHECK(pred) static_assert(pred, "")
358
359#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
360
361// Limits for integral types. We have to redefine it in case we don't
362// have stdint.h (like in Visual Studio 9).
363#undef __INT64_C
364#undef __UINT64_C
365#if SANITIZER_WORDSIZE == 64
366# define __INT64_C(c) c ## L
367# define __UINT64_C(c) c ## UL
368#else
369# define __INT64_C(c) c ## LL
370# define __UINT64_C(c) c ## ULL
371#endif // SANITIZER_WORDSIZE == 64
372#undef INT32_MIN
373#define INT32_MIN (-2147483647-1)
374#undef INT32_MAX
375#define INT32_MAX (2147483647)
376#undef UINT32_MAX
377#define UINT32_MAX (4294967295U)
378#undef INT64_MIN
379#define INT64_MIN (-__INT64_C(9223372036854775807)-1)
380#undef INT64_MAX
381#define INT64_MAX (__INT64_C(9223372036854775807))
382#undef UINT64_MAX
383#define UINT64_MAX (__UINT64_C(18446744073709551615))
384#undef UINTPTR_MAX
385#if SANITIZER_WORDSIZE == 64
386# define UINTPTR_MAX (18446744073709551615UL)
387#else
388# define UINTPTR_MAX (4294967295U)
389#endif // SANITIZER_WORDSIZE == 64
390
391enum LinkerInitialized { LINKER_INITIALIZED = 0 };
392
393#if !defined(_MSC_VER) || defined(__clang__)
394# define GET_CALLER_PC() \
395 ((__sanitizer::uptr)__builtin_extract_return_addr( \
396 __builtin_return_address(0)))
397# define GET_CURRENT_FRAME() ((__sanitizer::uptr)__builtin_frame_address(0))
398inline void Trap() {
399 __builtin_trap();
400}
401#else
402extern "C" void* _ReturnAddress(void);
403extern "C" void* _AddressOfReturnAddress(void);
404# pragma intrinsic(_ReturnAddress)
405# pragma intrinsic(_AddressOfReturnAddress)
406# define GET_CALLER_PC() ((__sanitizer::uptr)_ReturnAddress())
407// CaptureStackBackTrace doesn't need to know BP on Windows.
408# define GET_CURRENT_FRAME() \
409 (((__sanitizer::uptr)_AddressOfReturnAddress()) + sizeof(__sanitizer::uptr))
410
411extern "C" void __ud2(void);
412# pragma intrinsic(__ud2)
413inline void Trap() {
414 __ud2();
415}
416#endif
417
418#define HANDLE_EINTR(res, f) \
419 { \
420 int rverrno; \
421 do { \
422 res = (f); \
423 } while (internal_iserror(res, &rverrno) && rverrno == EINTR); \
424 }
425
426// Forces the compiler to generate a frame pointer in the function.
427#define ENABLE_FRAME_POINTER \
428 do { \
429 volatile __sanitizer::uptr enable_fp; \
430 enable_fp = GET_CURRENT_FRAME(); \
431 (void)enable_fp; \
432 } while (0)
433
434// Internal thread identifier allocated by ThreadRegistry.
435typedef u32 Tid;
436constexpr Tid kInvalidTid = -1;
437constexpr Tid kMainTid = 0;
438
439// Stack depot stack identifier.
440typedef u32 StackID;
441const StackID kInvalidStackID = 0;
442
443} // namespace __sanitizer
444
445namespace __asan {
446using namespace __sanitizer;
447}
448namespace __dsan {
449using namespace __sanitizer;
450}
451namespace __dfsan {
452using namespace __sanitizer;
453}
454namespace __lsan {
455using namespace __sanitizer;
456}
457namespace __msan {
458using namespace __sanitizer;
459}
460namespace __hwasan {
461using namespace __sanitizer;
462}
463namespace __tsan {
464using namespace __sanitizer;
465}
466namespace __scudo {
467using namespace __sanitizer;
468}
469namespace __ubsan {
470using namespace __sanitizer;
471}
472namespace __xray {
473using namespace __sanitizer;
474}
475namespace __interception {
476using namespace __sanitizer;
477}
478namespace __hwasan {
479using namespace __sanitizer;
480}
481namespace __memprof {
482using namespace __sanitizer;
483}
484
485#endif // SANITIZER_DEFS_H
486

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source code of compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h