Elliott Hughes | 71363a8 | 2012-05-18 11:56:17 -0700 | [diff] [blame] | 1 | #include <corkscrew/backtrace.h> |
Elliott Hughes | 04607b8 | 2012-05-18 16:53:22 -0700 | [diff] [blame] | 2 | #include <corkscrew/symbol_table.h> |
Elliott Hughes | 71363a8 | 2012-05-18 11:56:17 -0700 | [diff] [blame] | 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | |
| 6 | void do_backtrace() { |
| 7 | const size_t MAX_DEPTH = 32; |
| 8 | backtrace_frame_t* frames = (backtrace_frame_t*) malloc(sizeof(backtrace_frame_t) * MAX_DEPTH); |
| 9 | ssize_t frame_count = unwind_backtrace(frames, 0, MAX_DEPTH); |
| 10 | fprintf(stderr, "frame_count=%d\n", (int) frame_count); |
| 11 | |
| 12 | backtrace_symbol_t* backtrace_symbols = (backtrace_symbol_t*) malloc(sizeof(backtrace_symbol_t) * frame_count); |
| 13 | get_backtrace_symbols(frames, frame_count, backtrace_symbols); |
| 14 | |
| 15 | for (size_t i = 0; i < (size_t) frame_count; ++i) { |
| 16 | char line[MAX_BACKTRACE_LINE_LENGTH]; |
| 17 | format_backtrace_line(i, &frames[i], &backtrace_symbols[i], |
| 18 | line, MAX_BACKTRACE_LINE_LENGTH); |
Elliott Hughes | 04607b8 | 2012-05-18 16:53:22 -0700 | [diff] [blame] | 19 | if (backtrace_symbols[i].symbol_name != NULL) { |
| 20 | // get_backtrace_symbols found the symbol's name with dladdr(3). |
| 21 | fprintf(stderr, " %s\n", line); |
| 22 | } else { |
| 23 | // We don't have a symbol. Maybe this is a static symbol, and |
| 24 | // we can look it up? |
| 25 | symbol_table_t* symbols = NULL; |
| 26 | if (backtrace_symbols[i].map_name != NULL) { |
| 27 | symbols = load_symbol_table(backtrace_symbols[i].map_name); |
| 28 | } |
| 29 | const symbol_t* symbol = NULL; |
| 30 | if (symbols != NULL) { |
| 31 | symbol = find_symbol(symbols, frames[i].absolute_pc); |
| 32 | } |
| 33 | if (symbol != NULL) { |
| 34 | uintptr_t offset = frames[i].absolute_pc - symbol->start; |
| 35 | fprintf(stderr, " %s (%s%+d)\n", line, symbol->name, offset); |
| 36 | } else { |
| 37 | fprintf(stderr, " %s (\?\?\?)\n", line); |
| 38 | } |
| 39 | free(symbols); |
| 40 | } |
Elliott Hughes | 71363a8 | 2012-05-18 11:56:17 -0700 | [diff] [blame] | 41 | } |
| 42 | |
| 43 | free_backtrace_symbols(backtrace_symbols, frame_count); |
| 44 | free(backtrace_symbols); |
| 45 | free(frames); |
| 46 | } |
| 47 | |
| 48 | __attribute__ ((noinline)) void g() { |
| 49 | fprintf(stderr, "g()\n"); |
| 50 | do_backtrace(); |
| 51 | } |
| 52 | |
| 53 | __attribute__ ((noinline)) int f(int i) { |
| 54 | fprintf(stderr, "f(%i)\n", i); |
| 55 | if (i == 0) { |
| 56 | g(); |
| 57 | return 0; |
| 58 | } |
| 59 | return f(i - 1); |
| 60 | } |
| 61 | |
| 62 | int main() { |
| 63 | return f(5); |
| 64 | } |