1 //===----------------------------- config.h -------------------------------===// 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 // Defines macros used within libunwind project. 9 // 10 //===----------------------------------------------------------------------===// 11 12 13 #ifndef LIBUNWIND_CONFIG_H 14 #define LIBUNWIND_CONFIG_H 15 16 #include <assert.h> 17 #include <stdio.h> 18 #include <stdint.h> 19 #include <stdlib.h> 20 21 #include <__libunwind_config.h> 22 23 // Platform specific configuration defines. 24 #ifdef __APPLE__ 25 #if defined(FOR_DYLD) 26 #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1 27 #else 28 #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1 29 #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 1 30 #endif 31 #elif defined(_WIN32) 32 #ifdef __SEH__ 33 #define _LIBUNWIND_SUPPORT_SEH_UNWIND 1 34 #else 35 #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 1 36 #endif 37 #elif defined(_LIBUNWIND_IS_BAREMETAL) 38 #if !defined(_LIBUNWIND_ARM_EHABI) 39 #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 1 40 #define _LIBUNWIND_SUPPORT_DWARF_INDEX 1 41 #endif 42 #elif defined(__BIONIC__) && defined(_LIBUNWIND_ARM_EHABI) 43 // For ARM EHABI, Bionic didn't implement dl_iterate_phdr until API 21. After 44 // API 21, dl_iterate_phdr exists, but dl_unwind_find_exidx is much faster. 45 #define _LIBUNWIND_USE_DL_UNWIND_FIND_EXIDX 1 46 #else 47 // Assume an ELF system with a dl_iterate_phdr function. 48 #define _LIBUNWIND_USE_DL_ITERATE_PHDR 1 49 #if !defined(_LIBUNWIND_ARM_EHABI) 50 #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 1 51 #define _LIBUNWIND_SUPPORT_DWARF_INDEX 1 52 #endif 53 #endif 54 55 #if defined(_LIBUNWIND_HIDE_SYMBOLS) 56 // The CMake file passes -fvisibility=hidden to control ELF/Mach-O visibility. 57 #define _LIBUNWIND_EXPORT 58 #define _LIBUNWIND_HIDDEN 59 #else 60 #if !defined(__ELF__) && !defined(__MACH__) 61 #define _LIBUNWIND_EXPORT __declspec(dllexport) 62 #define _LIBUNWIND_HIDDEN 63 #else 64 #define _LIBUNWIND_EXPORT __attribute__((visibility("default"))) 65 #define _LIBUNWIND_HIDDEN __attribute__((visibility("hidden"))) 66 #endif 67 #endif 68 69 #define STR(a) #a 70 #define XSTR(a) STR(a) 71 #define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name 72 73 #if defined(__APPLE__) 74 #if defined(_LIBUNWIND_HIDE_SYMBOLS) 75 #define _LIBUNWIND_ALIAS_VISIBILITY(name) __asm__(".private_extern " name); 76 #else 77 #define _LIBUNWIND_ALIAS_VISIBILITY(name) 78 #endif 79 #define _LIBUNWIND_WEAK_ALIAS(name, aliasname) \ 80 __asm__(".globl " SYMBOL_NAME(aliasname)); \ 81 __asm__(SYMBOL_NAME(aliasname) " = " SYMBOL_NAME(name)); \ 82 _LIBUNWIND_ALIAS_VISIBILITY(SYMBOL_NAME(aliasname)) 83 #elif defined(__ELF__) 84 #define _LIBUNWIND_WEAK_ALIAS(name, aliasname) \ 85 extern "C" _LIBUNWIND_EXPORT __typeof(name) aliasname \ 86 __attribute__((weak, alias(#name))); 87 #elif defined(_WIN32) 88 #if defined(__MINGW32__) 89 #define _LIBUNWIND_WEAK_ALIAS(name, aliasname) \ 90 extern "C" _LIBUNWIND_EXPORT __typeof(name) aliasname \ 91 __attribute__((alias(#name))); 92 #else 93 #define _LIBUNWIND_WEAK_ALIAS(name, aliasname) \ 94 __pragma(comment(linker, "/alternatename:" SYMBOL_NAME(aliasname) "=" \ 95 SYMBOL_NAME(name))) \ 96 extern "C" _LIBUNWIND_EXPORT __typeof(name) aliasname; 97 #endif 98 #else 99 #error Unsupported target 100 #endif 101 102 // Apple/armv7k defaults to DWARF/Compact unwinding, but its libunwind also 103 // needs to include the SJLJ APIs. 104 #if (defined(__APPLE__) && defined(__arm__)) || defined(__USING_SJLJ_EXCEPTIONS__) 105 #define _LIBUNWIND_BUILD_SJLJ_APIS 106 #endif 107 108 #if defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || defined(__ppc64__) || defined(__powerpc64__) 109 #define _LIBUNWIND_SUPPORT_FRAME_APIS 110 #endif 111 112 #if defined(__i386__) || defined(__x86_64__) || \ 113 defined(__ppc__) || defined(__ppc64__) || defined(__powerpc64__) || \ 114 (!defined(__APPLE__) && defined(__arm__)) || \ 115 defined(__aarch64__) || \ 116 defined(__mips__) || \ 117 defined(__riscv) || \ 118 defined(__hexagon__) 119 #if !defined(_LIBUNWIND_BUILD_SJLJ_APIS) 120 #define _LIBUNWIND_BUILD_ZERO_COST_APIS 121 #endif 122 #endif 123 124 #ifndef _LIBUNWIND_REMEMBER_HEAP_ALLOC 125 #if defined(_LIBUNWIND_REMEMBER_STACK_ALLOC) || defined(__APPLE__) || \ 126 defined(__linux__) || defined(__ANDROID__) || defined(__MINGW32__) || \ 127 defined(_LIBUNWIND_IS_BAREMETAL) 128 #define _LIBUNWIND_REMEMBER_ALLOC(_size) alloca(_size) 129 #define _LIBUNWIND_REMEMBER_FREE(_ptr) \ 130 do { \ 131 } while (0) 132 #elif defined(_WIN32) 133 #define _LIBUNWIND_REMEMBER_ALLOC(_size) _malloca(_size) 134 #define _LIBUNWIND_REMEMBER_FREE(_ptr) _freea(_ptr) 135 #define _LIBUNWIND_REMEMBER_CLEANUP_NEEDED 136 #else 137 #define _LIBUNWIND_REMEMBER_ALLOC(_size) malloc(_size) 138 #define _LIBUNWIND_REMEMBER_FREE(_ptr) free(_ptr) 139 #define _LIBUNWIND_REMEMBER_CLEANUP_NEEDED 140 #endif 141 #else /* _LIBUNWIND_REMEMBER_HEAP_ALLOC */ 142 #define _LIBUNWIND_REMEMBER_ALLOC(_size) malloc(_size) 143 #define _LIBUNWIND_REMEMBER_FREE(_ptr) free(_ptr) 144 #define _LIBUNWIND_REMEMBER_CLEANUP_NEEDED 145 #endif 146 147 #if defined(NDEBUG) && defined(_LIBUNWIND_IS_BAREMETAL) 148 #define _LIBUNWIND_ABORT(msg) \ 149 do { \ 150 abort(); \ 151 } while (0) 152 #else 153 #define _LIBUNWIND_ABORT(msg) \ 154 do { \ 155 fprintf(stderr, "libunwind: %s - %s\n", __func__, msg); \ 156 fflush(stderr); \ 157 abort(); \ 158 } while (0) 159 #endif 160 161 #if defined(NDEBUG) && defined(_LIBUNWIND_IS_BAREMETAL) 162 #define _LIBUNWIND_LOG0(msg) 163 #define _LIBUNWIND_LOG(msg, ...) 164 #else 165 #define _LIBUNWIND_LOG0(msg) \ 166 fprintf(stderr, "libunwind: " msg "\n") 167 #define _LIBUNWIND_LOG(msg, ...) \ 168 fprintf(stderr, "libunwind: " msg "\n", __VA_ARGS__) 169 #endif 170 171 #if defined(NDEBUG) 172 #define _LIBUNWIND_LOG_IF_FALSE(x) x 173 #else 174 #define _LIBUNWIND_LOG_IF_FALSE(x) \ 175 do { \ 176 bool _ret = x; \ 177 if (!_ret) \ 178 _LIBUNWIND_LOG("" #x " failed in %s", __FUNCTION__); \ 179 } while (0) 180 #endif 181 182 // Macros that define away in non-Debug builds 183 #ifdef NDEBUG 184 #define _LIBUNWIND_DEBUG_LOG(msg, ...) 185 #define _LIBUNWIND_TRACE_API(msg, ...) 186 #define _LIBUNWIND_TRACING_UNWINDING (0) 187 #define _LIBUNWIND_TRACING_DWARF (0) 188 #define _LIBUNWIND_TRACE_UNWINDING(msg, ...) 189 #define _LIBUNWIND_TRACE_DWARF(...) 190 #else 191 #ifdef __cplusplus 192 extern "C" { 193 #endif 194 extern bool logAPIs(); 195 extern bool logUnwinding(); 196 extern bool logDWARF(); 197 #ifdef __cplusplus 198 } 199 #endif 200 #define _LIBUNWIND_DEBUG_LOG(msg, ...) _LIBUNWIND_LOG(msg, __VA_ARGS__) 201 #define _LIBUNWIND_TRACE_API(msg, ...) \ 202 do { \ 203 if (logAPIs()) \ 204 _LIBUNWIND_LOG(msg, __VA_ARGS__); \ 205 } while (0) 206 #define _LIBUNWIND_TRACING_UNWINDING logUnwinding() 207 #define _LIBUNWIND_TRACING_DWARF logDWARF() 208 #define _LIBUNWIND_TRACE_UNWINDING(msg, ...) \ 209 do { \ 210 if (logUnwinding()) \ 211 _LIBUNWIND_LOG(msg, __VA_ARGS__); \ 212 } while (0) 213 #define _LIBUNWIND_TRACE_DWARF(...) \ 214 do { \ 215 if (logDWARF()) \ 216 fprintf(stderr, __VA_ARGS__); \ 217 } while (0) 218 #endif 219 220 #ifdef __cplusplus 221 // Used to fit UnwindCursor and Registers_xxx types against unw_context_t / 222 // unw_cursor_t sized memory blocks. 223 #if defined(_LIBUNWIND_IS_NATIVE_ONLY) 224 # define COMP_OP == 225 #else 226 # define COMP_OP <= 227 #endif 228 template <typename _Type, typename _Mem> 229 struct check_fit { 230 template <typename T> 231 struct blk_count { 232 static const size_t count = 233 (sizeof(T) + sizeof(uint64_t) - 1) / sizeof(uint64_t); 234 }; 235 static const bool does_fit = 236 (blk_count<_Type>::count COMP_OP blk_count<_Mem>::count); 237 }; 238 #undef COMP_OP 239 #endif // __cplusplus 240 241 #endif // LIBUNWIND_CONFIG_H 242