asan_internal.h revision ef14ff6512d7b2e20aa3206dff820b5f90285420
11e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany//===-- asan_internal.h -----------------------------------------*- C++ -*-===// 21e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 31e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The LLVM Compiler Infrastructure 41e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 51e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// This file is distributed under the University of Illinois Open Source 61e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// License. See LICENSE.TXT for details. 71e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 81e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany//===----------------------------------------------------------------------===// 91e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// This file is a part of AddressSanitizer, an address sanity checker. 111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// ASan-private header which defines various general utilities. 131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany//===----------------------------------------------------------------------===// 141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#ifndef ASAN_INTERNAL_H 151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define ASAN_INTERNAL_H 161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 17d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany#if !defined(__linux__) && !defined(__APPLE__) 18d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany# error "This operating system is not supported by AddressSanitizer" 19d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany#endif 20d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany 211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <stdint.h> // for __WORDSIZE 221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <stdlib.h> // for size_t 231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <unistd.h> // for _exit 241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 254616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar// If __WORDSIZE was undefined by the platform, define it in terms of the 264616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar// compiler built-in __LP64__. 274616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#ifndef __WORDSIZE 284616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#if __LP64__ 294616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#define __WORDSIZE 64 304616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#else 314616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#define __WORDSIZE 32 324616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#endif 334616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar#endif 344616633bb9e20f66d83bfac70c9afce1922d1eecDaniel Dunbar 351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#ifdef ANDROID 361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <sys/atomics.h> 371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#endif 381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3913ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany#if defined(__has_feature) && __has_feature(address_sanitizer) 401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany# error "The AddressSanitizer run-time should not be" 411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany " instrumented by AddressSanitizer" 421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#endif 431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 44c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany// Build-time configuration options. 45c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany 46c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany// If set, sysinfo/sysinfo.h will be used to iterate over /proc/maps. 47c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#ifndef ASAN_USE_SYSINFO 48df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany#ifdef __linux__ 49df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany# define ASAN_USE_SYSINFO 0 50df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany#else 51c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany# define ASAN_USE_SYSINFO 1 52c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#endif 53df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany#endif 54c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany 55c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany// If set, asan will install its own SEGV signal handler. 56c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#ifndef ASAN_NEEDS_SEGV 57c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany# define ASAN_NEEDS_SEGV 1 58c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#endif 59c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany 60c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany// If set, asan will intercept C++ exception api call(s). 61c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#ifndef ASAN_HAS_EXCEPTIONS 62c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany# define ASAN_HAS_EXCEPTIONS 1 63c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#endif 64c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany 65c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany// If set, asan uses the values of SHADOW_SCALE and SHADOW_OFFSET 66c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany// provided by the instrumented objects. Otherwise constants are used. 67c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#ifndef ASAN_FLEXIBLE_MAPPING_AND_OFFSET 68c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany# define ASAN_FLEXIBLE_MAPPING_AND_OFFSET 0 69c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany#endif 70c6f2223a8772262e5e682403f2d57f0b465a98fcKostya Serebryany 711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// All internal functions in asan reside inside the __asan namespace 721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// to avoid namespace collisions with the user programs. 731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Seperate namespace also makes it simpler to distinguish the asan run-time 741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// functions from the instrumented user code in a profile. 751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace __asan { 761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyclass AsanThread; 781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct AsanStackTrace; 791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 80218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// asan_rtl.cc 811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid CheckFailed(const char *cond, const char *file, int line); 821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid ShowStatsAndAbort(); 831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 84218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// asan_globals.cc 851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanybool DescribeAddrIfGlobal(uintptr_t addr); 861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 87218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// asan_malloc_linux.cc / asan_malloc_mac.cc 881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid ReplaceSystemMalloc(); 891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 90de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid OutOfMemoryMessageAndDie(const char *mem_type, size_t size); 91de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 92218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// asan_linux.cc / asan_mac.cc 931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid *AsanDoesNotSupportStaticLinkage(); 94de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyint AsanOpenReadonly(const char* filename); 95de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 96a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanyvoid *AsanMmapFixedNoReserve(uintptr_t fixed_addr, size_t size); 97a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanyvoid *AsanMmapFixedReserve(uintptr_t fixed_addr, size_t size); 98a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanyvoid *AsanMprotect(uintptr_t fixed_addr, size_t size); 99de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid *AsanMmapSomewhereOrDie(size_t size, const char *where); 100de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid AsanUnmapOrDie(void *ptr, size_t size); 101de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 102ef14ff6512d7b2e20aa3206dff820b5f90285420Kostya Serebryanyvoid AsanDisableCoreDumper(); 103ef14ff6512d7b2e20aa3206dff820b5f90285420Kostya Serebryany 104de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyssize_t AsanRead(int fd, void *buf, size_t count); 105de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyssize_t AsanWrite(int fd, const void *buf, size_t count); 106de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyint AsanClose(int fd); 1071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 108df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany// Opens the file 'file_name" and reads up to 'max_len' bytes. 109df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany// The resulting buffer is mmaped and stored in '*buff'. 110df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany// The size of the mmaped region is stored in '*buff_size', 111df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany// Returns the number of read bytes or -1 if file can not be opened. 112df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryanyssize_t ReadFileToBuffer(const char *file_name, char **buff, 113df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany size_t *buff_size, size_t max_len); 114df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryany 115218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// asan_printf.cc 1161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid RawWrite(const char *buffer); 1171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyint SNPrint(char *buffer, size_t length, const char *format, ...); 1181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid Printf(const char *format, ...); 119df499b44de81fc757a789878f07fcaf19ebb0016Kostya Serebryanyint SScanf(const char *str, const char *format, ...); 1201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid Report(const char *format, ...); 1211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1222d8b3bdb112ebb8ed3f15ee41d4cebcd683b41b0Kostya Serebryany// Don't use std::min and std::max, to minimize dependency on libstdc++. 1232d8b3bdb112ebb8ed3f15ee41d4cebcd683b41b0Kostya Serebryanytemplate<class T> T Min(T a, T b) { return a < b ? a : b; } 1242d8b3bdb112ebb8ed3f15ee41d4cebcd683b41b0Kostya Serebryanytemplate<class T> T Max(T a, T b) { return a > b ? a : b; } 1252d8b3bdb112ebb8ed3f15ee41d4cebcd683b41b0Kostya Serebryany 126218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// asan_poisoning.cc 127218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// Poisons the shadow memory for "size" bytes starting from "addr". 128218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryanyvoid PoisonShadow(uintptr_t addr, size_t size, uint8_t value); 129218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// Poisons the shadow memory for "redzone_size" bytes starting from 130218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany// "addr + size". 131218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryanyvoid PoisonShadowPartialRightRedzone(uintptr_t addr, 132218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany uintptr_t size, 133218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany uintptr_t redzone_size, 134218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany uint8_t value); 135218a9b70d7338cf5b727b7dad6b080ad7869c6c2Kostya Serebryany 1361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern size_t FLAG_quarantine_size; 1371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern int FLAG_demangle; 1381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_symbolize; 1391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern int FLAG_v; 1401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern size_t FLAG_redzone; 1411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern int FLAG_debug; 1421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_poison_shadow; 1431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern int FLAG_report_globals; 1441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern size_t FLAG_malloc_context_size; 1451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_replace_str; 1461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_replace_intrin; 1471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_replace_cfallocator; 1481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_fast_unwind; 1491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_use_fake_stack; 1501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern size_t FLAG_max_malloc_fill_size; 1511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern int FLAG_exitcode; 1521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool FLAG_allow_user_poisoning; 1531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern int asan_inited; 1551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Used to avoid infinite recursion in __asan_init(). 1561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern bool asan_init_is_running; 1571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyenum LinkerInitialized { LINKER_INITIALIZED = 0 }; 1591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#ifndef ASAN_DIE 1611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define ASAN_DIE _exit(FLAG_exitcode) 1621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#endif // ASAN_DIE 1631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define CHECK(cond) do { if (!(cond)) { \ 1651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany CheckFailed(#cond, __FILE__, __LINE__); \ 1661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}}while(0) 1671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define RAW_CHECK_MSG(expr, msg) do { \ 1691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (!(expr)) { \ 1701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany RawWrite(msg); \ 1711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany ASAN_DIE; \ 1721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } \ 1731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} while (0) 1741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define RAW_CHECK(expr) RAW_CHECK_MSG(expr, #expr) 1761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define UNIMPLEMENTED() CHECK("unimplemented" && 0) 1781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define ASAN_ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) 1801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst size_t kWordSize = __WORDSIZE / 8; 1821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst size_t kWordSizeInBits = 8 * kWordSize; 1831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst size_t kPageSizeBits = 12; 1841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst size_t kPageSize = 1UL << kPageSizeBits; 1851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define GET_CALLER_PC() (uintptr_t)__builtin_return_address(0) 1871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define GET_CURRENT_FRAME() (uintptr_t)__builtin_frame_address(0) 1881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#define GET_BP_PC_SP \ 1901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany uintptr_t bp = GET_CURRENT_FRAME(); \ 1911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany uintptr_t pc = GET_CALLER_PC(); \ 1921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany uintptr_t local_stack; \ 1931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany uintptr_t sp = (uintptr_t)&local_stack; 1941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// These magic values are written to shadow for better error reporting. 1961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanHeapLeftRedzoneMagic = 0xfa; 1971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanHeapRightRedzoneMagic = 0xfb; 1981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanHeapFreeMagic = 0xfd; 1991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanStackLeftRedzoneMagic = 0xf1; 2001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanStackMidRedzoneMagic = 0xf2; 2011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanStackRightRedzoneMagic = 0xf3; 2021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanStackPartialRedzoneMagic = 0xf4; 2031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanStackAfterReturnMagic = 0xf5; 2041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanUserPoisonedMemoryMagic = 0xf7; 2051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int kAsanGlobalRedzoneMagic = 0xf9; 2066b30e2cf0d9d471d276f91ef4bb74dbd9876f4d9Kostya Serebryanyconst int kAsanInternalHeapMagic = 0xfe; 2071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 2091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 2101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 211de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany// --------------------------- Bit twiddling ------- {{{1 212de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyinline bool IsPowerOfTwo(size_t x) { 213de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return (x & (x - 1)) == 0; 214de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 215de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 216de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyinline size_t RoundUpTo(size_t size, size_t boundary) { 217de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany CHECK(IsPowerOfTwo(boundary)); 218de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return (size + boundary - 1) & ~(boundary - 1); 219de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 220de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 221b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany// -------------------------- LowLevelAllocator ----- {{{1 222b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany// A simple low-level memory allocator for internal use. 223b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryanyclass LowLevelAllocator { 224b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany public: 225b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany explicit LowLevelAllocator(LinkerInitialized) {} 226b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany // 'size' must be a power of two. 227b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany // Requires an external lock. 228b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany void *Allocate(size_t size); 229b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany private: 230b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany char *allocated_end_; 231b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany char *allocated_current_; 232b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany}; 233b89567ce41bef82cf92a9c741c78b632c07b2781Kostya Serebryany 2341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// -------------------------- Atomic ---------------- {{{1 2351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic inline int AtomicInc(int *a) { 2361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#ifdef ANDROID 2371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return __atomic_inc(a) + 1; 2381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#else 2391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return __sync_add_and_fetch(a, 1); 2401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#endif 2411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 2421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic inline int AtomicDec(int *a) { 2441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#ifdef ANDROID 2451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return __atomic_dec(a) - 1; 2461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#else 2471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return __sync_add_and_fetch(a, -1); 2481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#endif 2491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 2501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} // namespace __asan 2521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#endif // ASAN_INTERNAL_H 254