asan_internal.h revision 7ed1d2b699767dd1875994cb625d51a95b44221a 
1//===-- asan_internal.h -----------------------------------------*- C++ -*-===//
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// This file is a part of AddressSanitizer, an address sanity checker.
11//
12// ASan-private header which defines various general utilities.
13//===----------------------------------------------------------------------===//
14#ifndef ASAN_INTERNAL_H
15#define ASAN_INTERNAL_H
16
17#include "asan_flags.h"
18#include "sanitizer_common/sanitizer_common.h"
19#include "sanitizer_common/sanitizer_internal_defs.h"
20#include "sanitizer_common/sanitizer_libc.h"
21
22#if !defined(__linux__) && !defined(__APPLE__) && !defined(_WIN32)
23# error "This operating system is not supported by AddressSanitizer"
24#endif
25
26#if defined(_WIN32)
27extern "C" void* _ReturnAddress(void);
28# pragma intrinsic(_ReturnAddress)
29#endif  // defined(_WIN32)
30
31#define ASAN_DEFAULT_FAILURE_EXITCODE 1
32
33#if defined(__linux__)
34# define ASAN_LINUX   1
35#else
36# define ASAN_LINUX   0
37#endif
38
39#if defined(__APPLE__)
40# define ASAN_MAC     1
41#else
42# define ASAN_MAC     0
43#endif
44
45#if defined(_WIN32)
46# define ASAN_WINDOWS 1
47#else
48# define ASAN_WINDOWS 0
49#endif
50
51#define ASAN_POSIX (ASAN_LINUX || ASAN_MAC)
52
53#if __has_feature(address_sanitizer)
54# error "The AddressSanitizer run-time should not be"
55        " instrumented by AddressSanitizer"
56#endif
57
58// Build-time configuration options.
59
60// If set, asan will install its own SEGV signal handler.
61#ifndef ASAN_NEEDS_SEGV
62# define ASAN_NEEDS_SEGV 1
63#endif
64
65// If set, asan will intercept C++ exception api call(s).
66#ifndef ASAN_HAS_EXCEPTIONS
67# define ASAN_HAS_EXCEPTIONS 1
68#endif
69
70// If set, asan uses the values of SHADOW_SCALE and SHADOW_OFFSET
71// provided by the instrumented objects. Otherwise constants are used.
72#ifndef ASAN_FLEXIBLE_MAPPING_AND_OFFSET
73# define ASAN_FLEXIBLE_MAPPING_AND_OFFSET 0
74#endif
75
76// If set, values like allocator chunk size, as well as defaults for some flags
77// will be changed towards less memory overhead.
78#ifndef ASAN_LOW_MEMORY
79# define ASAN_LOW_MEMORY 0
80#endif
81
82// All internal functions in asan reside inside the __asan namespace
83// to avoid namespace collisions with the user programs.
84// Seperate namespace also makes it simpler to distinguish the asan run-time
85// functions from the instrumented user code in a profile.
86namespace __asan {
87
88class AsanThread;
89struct AsanStackTrace;
90
91// asan_rtl.cc
92void NORETURN ShowStatsAndAbort();
93
94// asan_globals.cc
95bool DescribeAddrIfGlobal(uptr addr);
96
97void ReplaceOperatorsNewAndDelete();
98// asan_malloc_linux.cc / asan_malloc_mac.cc
99void ReplaceSystemMalloc();
100
101// asan_linux.cc / asan_mac.cc / asan_win.cc
102void *AsanDoesNotSupportStaticLinkage();
103
104void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp);
105
106bool AsanInterceptsSignal(int signum);
107void SetAlternateSignalStack();
108void UnsetAlternateSignalStack();
109void InstallSignalHandlers();
110
111// Wrapper for TLS/TSD.
112void AsanTSDInit(void (*destructor)(void *tsd));
113void *AsanTSDGet();
114void AsanTSDSet(void *tsd);
115
116void AppendToErrorMessageBuffer(const char *buffer);
117// asan_printf.cc
118void AsanPrintf(const char *format, ...);
119void AsanReport(const char *format, ...);
120
121// asan_poisoning.cc
122// Poisons the shadow memory for "size" bytes starting from "addr".
123void PoisonShadow(uptr addr, uptr size, u8 value);
124// Poisons the shadow memory for "redzone_size" bytes starting from
125// "addr + size".
126void PoisonShadowPartialRightRedzone(uptr addr,
127                                     uptr size,
128                                     uptr redzone_size,
129                                     u8 value);
130
131// Platfrom-specific options.
132#ifdef __APPLE__
133bool PlatformHasDifferentMemcpyAndMemmove();
134# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \
135    (PlatformHasDifferentMemcpyAndMemmove())
136#else
137# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true
138#endif  // __APPLE__
139
140extern int asan_inited;
141// Used to avoid infinite recursion in __asan_init().
142extern bool asan_init_is_running;
143extern void (*death_callback)(void);
144
145enum LinkerInitialized { LINKER_INITIALIZED = 0 };
146
147#define ASAN_ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
148
149#if !defined(_WIN32) || defined(__clang__)
150# define GET_CALLER_PC() (uptr)__builtin_return_address(0)
151# define GET_CURRENT_FRAME() (uptr)__builtin_frame_address(0)
152#else
153# define GET_CALLER_PC() (uptr)_ReturnAddress()
154// CaptureStackBackTrace doesn't need to know BP on Windows.
155// FIXME: This macro is still used when printing error reports though it's not
156// clear if the BP value is needed in the ASan reports on Windows.
157# define GET_CURRENT_FRAME() (uptr)0xDEADBEEF
158#endif
159
160#ifdef _WIN32
161# ifndef ASAN_USE_EXTERNAL_SYMBOLIZER
162#  define ASAN_USE_EXTERNAL_SYMBOLIZER __asan_WinSymbolize
163bool __asan_WinSymbolize(const void *addr, char *out_buffer, int buffer_size);
164# endif
165#endif  // _WIN32
166
167// These magic values are written to shadow for better error reporting.
168const int kAsanHeapLeftRedzoneMagic = 0xfa;
169const int kAsanHeapRightRedzoneMagic = 0xfb;
170const int kAsanHeapFreeMagic = 0xfd;
171const int kAsanStackLeftRedzoneMagic = 0xf1;
172const int kAsanStackMidRedzoneMagic = 0xf2;
173const int kAsanStackRightRedzoneMagic = 0xf3;
174const int kAsanStackPartialRedzoneMagic = 0xf4;
175const int kAsanStackAfterReturnMagic = 0xf5;
176const int kAsanUserPoisonedMemoryMagic = 0xf7;
177const int kAsanGlobalRedzoneMagic = 0xf9;
178const int kAsanInternalHeapMagic = 0xfe;
179
180static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
181static const uptr kRetiredStackFrameMagic = 0x45E0360E;
182
183// -------------------------- LowLevelAllocator ----- {{{1
184// A simple low-level memory allocator for internal use.
185class LowLevelAllocator {
186 public:
187  explicit LowLevelAllocator(LinkerInitialized) {}
188  // 'size' must be a power of two.
189  // Requires an external lock.
190  void *Allocate(uptr size);
191 private:
192  char *allocated_end_;
193  char *allocated_current_;
194};
195
196}  // namespace __asan
197
198#endif  // ASAN_INTERNAL_H
199