64 lines
2 KiB
C
64 lines
2 KiB
C
#include <corkscrew/backtrace.h>
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#include <corkscrew/symbol_table.h>
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#include <stdio.h>
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#include <stdlib.h>
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void do_backtrace() {
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const size_t MAX_DEPTH = 32;
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backtrace_frame_t* frames = (backtrace_frame_t*) malloc(sizeof(backtrace_frame_t) * MAX_DEPTH);
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ssize_t frame_count = unwind_backtrace(frames, 0, MAX_DEPTH);
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fprintf(stderr, "frame_count=%d\n", (int) frame_count);
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backtrace_symbol_t* backtrace_symbols = (backtrace_symbol_t*) malloc(sizeof(backtrace_symbol_t) * frame_count);
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get_backtrace_symbols(frames, frame_count, backtrace_symbols);
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for (size_t i = 0; i < (size_t) frame_count; ++i) {
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char line[MAX_BACKTRACE_LINE_LENGTH];
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format_backtrace_line(i, &frames[i], &backtrace_symbols[i],
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line, MAX_BACKTRACE_LINE_LENGTH);
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if (backtrace_symbols[i].symbol_name != NULL) {
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// get_backtrace_symbols found the symbol's name with dladdr(3).
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fprintf(stderr, " %s\n", line);
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} else {
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// We don't have a symbol. Maybe this is a static symbol, and
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// we can look it up?
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symbol_table_t* symbols = NULL;
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if (backtrace_symbols[i].map_name != NULL) {
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symbols = load_symbol_table(backtrace_symbols[i].map_name);
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}
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const symbol_t* symbol = NULL;
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if (symbols != NULL) {
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symbol = find_symbol(symbols, frames[i].absolute_pc);
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}
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if (symbol != NULL) {
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uintptr_t offset = frames[i].absolute_pc - symbol->start;
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fprintf(stderr, " %s (%s%+d)\n", line, symbol->name, offset);
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} else {
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fprintf(stderr, " %s (\?\?\?)\n", line);
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}
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free_symbol_table(symbols);
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}
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}
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free_backtrace_symbols(backtrace_symbols, frame_count);
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free(backtrace_symbols);
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free(frames);
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}
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__attribute__ ((noinline)) void g() {
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fprintf(stderr, "g()\n");
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do_backtrace();
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}
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__attribute__ ((noinline)) int f(int i) {
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fprintf(stderr, "f(%i)\n", i);
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if (i == 0) {
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g();
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return 0;
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}
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return f(i - 1);
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}
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int main() {
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return f(5);
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}
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