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Use libunwind for printing backtrace

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This commit is contained in:
Christian Göttsche
2021-05-16 20:45:09 +02:00
committed by BenBE
parent 29983ff83a
commit 29e1fcfa05
2 changed files with 101 additions and 12 deletions
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77
CRT.c
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@ -21,14 +21,22 @@ in the source distribution for its full text.
#include "ProvideCurses.h"
#include "XUtils.h"
#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
#endif
#if !defined(NDEBUG) && defined(HAVE_MEMFD_CREATE)
#include <sys/mman.h>
#endif
#if defined(HAVE_LIBUNWIND_H) && defined(HAVE_LIBUNWIND)
# define PRINT_BACKTRACE
# define UNW_LOCAL_ONLY
# include <libunwind.h>
# if defined(HAVE_DLADDR)
# include <dlfcn.h>
# endif
#elif defined(HAVE_EXECINFO_H)
# define PRINT_BACKTRACE
# include <execinfo.h>
#endif
#define ColorIndex(i,j) ((7-(i))*8+(j))
@ -1008,6 +1016,59 @@ void CRT_setColors(int colorScheme) {
CRT_colors = CRT_colorSchemes[colorScheme];
}
#ifdef PRINT_BACKTRACE
static void print_backtrace(void) {
#if defined(HAVE_LIBUNWIND_H) && defined(HAVE_LIBUNWIND)
unw_context_t context;
unw_getcontext(&context);
unw_cursor_t cursor;
unw_init_local(&cursor, &context);
unsigned int item = 0;
while (unw_step(&cursor) > 0) {
unw_word_t pc;
unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (pc == 0)
break;
char symbolName[256] = "?";
unw_word_t offset = 0;
unw_get_proc_name(&cursor, symbolName, sizeof(symbolName), &offset);
unw_proc_info_t pip;
pip.unwind_info = NULL;
const char* fname = "?";
const void* ptr = 0;
if (unw_get_proc_info(&cursor, &pip) == 0) {
ptr = (const void*)(pip.start_ip + offset);
#ifdef HAVE_DLADDR
Dl_info dlinfo;
if (dladdr(ptr, &dlinfo) && dlinfo.dli_fname && *dlinfo.dli_fname)
fname = dlinfo.dli_fname;
#endif
}
const char* frame = "";
if (unw_is_signal_frame(&cursor) > 0)
frame = "{signal frame}";
fprintf(stderr, "%2u: %#14lx %s (%s+%#lx) [%p]%s%s\n", item++, pc, fname, symbolName, offset, ptr, frame ? " " : "", frame);
}
#elif defined(HAVE_EXECINFO_H)
void* backtraceArray[256];
size_t size = backtrace(backtraceArray, ARRAYSIZE(backtraceArray));
backtrace_symbols_fd(backtraceArray, size, STDERR_FILENO);
#else
#error No implementation for print_backtrace()!
#endif
}
#endif
void CRT_handleSIGSEGV(int signal) {
CRT_done();
@ -1022,7 +1083,7 @@ void CRT_handleSIGSEGV(int signal) {
" - Likely steps to reproduce (How did it happen?)\n"
);
#ifdef HAVE_EXECINFO_H
#ifdef PRINT_BACKTRACE
fprintf(stderr, " - Backtrace of the issue (see below)\n");
#endif
@ -1048,16 +1109,14 @@ void CRT_handleSIGSEGV(int signal) {
Settings_write(CRT_crashSettings, true);
fprintf(stderr, "\n\n");
#ifdef HAVE_EXECINFO_H
#ifdef PRINT_BACKTRACE
fprintf(stderr,
"Backtrace information:\n"
"----------------------\n"
);
void* backtraceArray[256];
print_backtrace();
size_t size = backtrace(backtraceArray, ARRAYSIZE(backtraceArray));
backtrace_symbols_fd(backtraceArray, size, STDERR_FILENO);
fprintf(stderr,
"\n"
"To make the above information more practical to work with, "