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| 1 | +/* SPDX-License-Identifier: MIT */ |
| 2 | +/* Copyright (c) 2013-2022 Winlin */ |
| 3 | + |
| 4 | +#ifdef __linux__ |
| 5 | +#define _GNU_SOURCE |
| 6 | +#endif |
| 7 | + |
| 8 | +#include <execinfo.h> |
| 9 | +#include <stdio.h> |
| 10 | +#include <stdlib.h> |
| 11 | + |
| 12 | +#include <st.h> |
| 13 | + |
| 14 | +#ifdef __linux__ |
| 15 | +#include <dlfcn.h> |
| 16 | +#include <stdio.h> |
| 17 | +#include <string.h> |
| 18 | + |
| 19 | +void* parse_symbol_offset(char* frame) |
| 20 | +{ |
| 21 | + char* p = NULL; |
| 22 | + char* p_symbol = NULL; |
| 23 | + int nn_symbol = 0; |
| 24 | + char* p_offset = NULL; |
| 25 | + int nn_offset = 0; |
| 26 | + |
| 27 | + // Read symbol and offset, for example: |
| 28 | + // /tools/backtrace(foo+0x1820) [0x555555555820] |
| 29 | + for (p = frame; *p; p++) { |
| 30 | + if (*p == '(') { |
| 31 | + p_symbol = p + 1; |
| 32 | + } else if (*p == '+') { |
| 33 | + if (p_symbol) nn_symbol = p - p_symbol; |
| 34 | + p_offset = p + 1; |
| 35 | + } else if (*p == ')') { |
| 36 | + if (p_offset) nn_offset = p - p_offset; |
| 37 | + } |
| 38 | + } |
| 39 | + if (!nn_symbol && !nn_offset) { |
| 40 | + return NULL; |
| 41 | + } |
| 42 | + |
| 43 | + // Convert offset(0x1820) to pointer, such as 0x1820. |
| 44 | + char tmp[128]; |
| 45 | + if (!nn_offset || nn_offset >= sizeof(tmp)) { |
| 46 | + return NULL; |
| 47 | + } |
| 48 | + |
| 49 | + int r0 = EOF; |
| 50 | + void* offset = NULL; |
| 51 | + tmp[nn_offset] = 0; |
| 52 | + if ((r0 = sscanf(strncpy(tmp, p_offset, nn_offset), "%p", &offset)) == EOF) { |
| 53 | + return NULL; |
| 54 | + } |
| 55 | + |
| 56 | + // Covert symbol(foo) to offset, such as 0x2fba. |
| 57 | + if (!nn_symbol || nn_symbol >= sizeof(tmp)) { |
| 58 | + return offset; |
| 59 | + } |
| 60 | + |
| 61 | + void* object_file; |
| 62 | + if ((object_file = dlopen(NULL, RTLD_LAZY)) == NULL) { |
| 63 | + return offset; |
| 64 | + } |
| 65 | + |
| 66 | + void* address; |
| 67 | + tmp[nn_symbol] = 0; |
| 68 | + if ((address = dlsym(object_file, strncpy(tmp, p_symbol, nn_symbol))) == NULL) { |
| 69 | + dlclose(object_file); |
| 70 | + return offset; |
| 71 | + } |
| 72 | + |
| 73 | + Dl_info symbol_info; |
| 74 | + if ((r0 = dladdr(address, &symbol_info)) == 0) { |
| 75 | + dlclose(object_file); |
| 76 | + return offset; |
| 77 | + } |
| 78 | + |
| 79 | + dlclose(object_file); |
| 80 | + return symbol_info.dli_saddr - symbol_info.dli_fbase + offset; |
| 81 | +} |
| 82 | + |
| 83 | +char* addr2line_format(void* addr, char* symbol, char* buffer, int nn_buffer) |
| 84 | +{ |
| 85 | + char cmd[512] = {0}; |
| 86 | + int r0 = snprintf(cmd, sizeof(cmd), "addr2line -C -p -s -f -a -e %s %p", "backtrace", addr - 1); |
| 87 | + if (r0 < 0 || r0 >= sizeof(cmd)) return symbol; |
| 88 | + |
| 89 | + FILE* fp = popen(cmd, "r"); |
| 90 | + if (!fp) return symbol; |
| 91 | + |
| 92 | + char* p = fgets(buffer, nn_buffer, fp); |
| 93 | + pclose(fp); |
| 94 | + |
| 95 | + if (p == NULL) return symbol; |
| 96 | + if ((r0 = strlen(p)) == 0) return symbol; |
| 97 | + |
| 98 | + // Trait the last newline if exists. |
| 99 | + if (p[r0 - 1] == '\n') p[r0 - 1] = '\0'; |
| 100 | + |
| 101 | + // Find symbol not match by addr2line, like |
| 102 | + // 0x0000000000021c87: ?? ??:0 |
| 103 | + // 0x0000000000002ffa: _start at ??:? |
| 104 | + for (p = buffer; p < buffer + r0 - 1; p++) { |
| 105 | + if (p[0] == '?' && p[1] == '?') return symbol; |
| 106 | + } |
| 107 | + |
| 108 | + return buffer; |
| 109 | +} |
| 110 | +#endif |
| 111 | + |
| 112 | +#ifdef __linux__ |
| 113 | +void bar2() |
| 114 | +{ |
| 115 | + void* addresses[64]; |
| 116 | + int nn_addresses = backtrace(addresses, sizeof(addresses) / sizeof(void*)); |
| 117 | + printf("\naddresses:\n"); |
| 118 | + for (int i = 0; i < nn_addresses; i++) { |
| 119 | + printf("%p\n", addresses[i]); |
| 120 | + } |
| 121 | + |
| 122 | + char** symbols = backtrace_symbols(addresses, nn_addresses); |
| 123 | + printf("\nsymbols:\n"); |
| 124 | + for (int i = 0; i < nn_addresses; i++) { |
| 125 | + printf("%s\n", symbols[i]); |
| 126 | + } |
| 127 | + |
| 128 | + char buffer[128]; |
| 129 | + printf("\nframes:\n"); |
| 130 | + for (int i = 0; i < nn_addresses; i++) { |
| 131 | + void* frame = parse_symbol_offset(symbols[i]); |
| 132 | + char* fmt = addr2line_format(frame, symbols[i], buffer, sizeof(buffer)); |
| 133 | + int parsed = (fmt == buffer); |
| 134 | + printf("%p %d %s\n", frame, parsed, fmt); |
| 135 | + } |
| 136 | + |
| 137 | + free(symbols); |
| 138 | + |
| 139 | + printf("bar2 OK\n"); |
| 140 | + return; |
| 141 | +} |
| 142 | +#endif |
| 143 | + |
| 144 | +int always_use_builtin = 0; |
| 145 | + |
| 146 | +#pragma GCC diagnostic push |
| 147 | +#pragma GCC diagnostic ignored "-Wframe-address" |
| 148 | +void bar() { |
| 149 | + // Each item in the array pointed to by buffer is of type void *, and is the return address from the corresponding |
| 150 | + // stack frame. |
| 151 | + void* addresses[64]; |
| 152 | + int nn_addresses = backtrace(addresses, sizeof(addresses) / sizeof(void*)); |
| 153 | + |
| 154 | + if (!nn_addresses || always_use_builtin) { |
| 155 | + printf("Try to get return addresses by __builtin_return_address\n"); |
| 156 | + void* p = NULL; nn_addresses = 0; |
| 157 | + if ((p = __builtin_return_address(0)) != NULL) { |
| 158 | + addresses[nn_addresses++] = p; |
| 159 | + if ((p = __builtin_return_address(1)) != NULL) { |
| 160 | + addresses[nn_addresses++] = p; |
| 161 | + if ((p = __builtin_return_address(2)) != NULL) { |
| 162 | + addresses[nn_addresses++] = p; |
| 163 | + if ((p = __builtin_return_address(3)) != NULL) { |
| 164 | + addresses[nn_addresses++] = p; |
| 165 | + if ((p = __builtin_return_address(4)) != NULL) { |
| 166 | + addresses[nn_addresses++] = p; |
| 167 | + if ((p = __builtin_return_address(5)) != NULL) { |
| 168 | + addresses[nn_addresses++] = p; |
| 169 | + } |
| 170 | + } |
| 171 | + } |
| 172 | + } |
| 173 | + } |
| 174 | + } |
| 175 | + } |
| 176 | + |
| 177 | + char** symbols = backtrace_symbols(addresses, nn_addresses); |
| 178 | + printf("nn_addresses=%d, symbols=%p, symbols[0]=%p\n", nn_addresses, symbols, symbols[0]); |
| 179 | + |
| 180 | + printf("\naddresses:\n"); |
| 181 | + for (int i = 0; i < nn_addresses; i++) { |
| 182 | + printf("%p\n", addresses[i]); |
| 183 | + } |
| 184 | + |
| 185 | + printf("\nsymbols:\n"); |
| 186 | + for (int i = 0; i < nn_addresses; i++) { |
| 187 | + printf("%s\n", symbols[i]); |
| 188 | + } |
| 189 | + free(symbols); |
| 190 | + |
| 191 | + printf("bar OK\n"); |
| 192 | + return; |
| 193 | +} |
| 194 | +#pragma GCC diagnostic pop |
| 195 | + |
| 196 | +void foo() { |
| 197 | + bar(); |
| 198 | +#ifdef __linux__ |
| 199 | + bar2(); |
| 200 | +#endif |
| 201 | + |
| 202 | + printf("foo OK\n"); |
| 203 | + return; |
| 204 | +} |
| 205 | + |
| 206 | +void* start(void* arg) |
| 207 | +{ |
| 208 | + foo(); |
| 209 | + |
| 210 | + printf("coroutine OK\n"); |
| 211 | + return NULL; |
| 212 | +} |
| 213 | + |
| 214 | +int main(int argc, char** argv) |
| 215 | +{ |
| 216 | + if (argc > 1) { |
| 217 | + always_use_builtin = 1; |
| 218 | + } |
| 219 | + |
| 220 | + st_init(); |
| 221 | + |
| 222 | + st_thread_create(start, NULL, 0, 0); |
| 223 | + st_thread_exit(NULL); |
| 224 | + |
| 225 | + printf("main done\n"); |
| 226 | + return 0; |
| 227 | +} |
| 228 | + |
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