1 #include <corkscrew/backtrace.h>
2 #include <corkscrew/symbol_table.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5
do_backtrace(float)6 int do_backtrace(float /* just to test demangling */) {
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 if (frame_count <= 0) {
12 return frame_count;
13 }
14
15 backtrace_symbol_t* backtrace_symbols = (backtrace_symbol_t*) malloc(sizeof(backtrace_symbol_t) * frame_count);
16 get_backtrace_symbols(frames, frame_count, backtrace_symbols);
17
18 for (size_t i = 0; i < (size_t) frame_count; ++i) {
19 char line[MAX_BACKTRACE_LINE_LENGTH];
20 format_backtrace_line(i, &frames[i], &backtrace_symbols[i],
21 line, MAX_BACKTRACE_LINE_LENGTH);
22 if (backtrace_symbols[i].symbol_name != NULL) {
23 // get_backtrace_symbols found the symbol's name with dladdr(3).
24 fprintf(stderr, " %s\n", line);
25 } else {
26 // We don't have a symbol. Maybe this is a static symbol, and
27 // we can look it up?
28 symbol_table_t* symbols = NULL;
29 if (backtrace_symbols[i].map_name != NULL) {
30 symbols = load_symbol_table(backtrace_symbols[i].map_name);
31 }
32 const symbol_t* symbol = NULL;
33 if (symbols != NULL) {
34 symbol = find_symbol(symbols, frames[i].absolute_pc);
35 }
36 if (symbol != NULL) {
37 int offset = frames[i].absolute_pc - symbol->start;
38 fprintf(stderr, " %s (%s%+d)\n", line, symbol->name, offset);
39 } else {
40 fprintf(stderr, " %s (\?\?\?)\n", line);
41 }
42 free_symbol_table(symbols);
43 }
44 }
45
46 free_backtrace_symbols(backtrace_symbols, frame_count);
47 free(backtrace_symbols);
48 free(frames);
49 return frame_count;
50 }
51
52 struct C {
53 int g(int i);
54 };
55
g(int i)56 __attribute__ ((noinline)) int C::g(int i) {
57 if (i == 0) {
58 return do_backtrace(0.1);
59 }
60 return g(i - 1);
61 }
62
f()63 extern "C" __attribute__ ((noinline)) int f() {
64 C c;
65 return c.g(5);
66 }
67
main()68 int main() {
69 flush_my_map_info_list();
70 f();
71
72 flush_my_map_info_list();
73 f();
74
75 return 0;
76 }
77