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94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
// stacktrace.h (c) 2008, Timo Bingmann from http://idlebox.net/
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// published under the WTFPL v2.0
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#ifndef _STACKTRACE_H_
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#define _STACKTRACE_H_
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#include <stdio.h>
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#include <stdlib.h>
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#include <execinfo.h>
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#include <cxxabi.h>
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/** Print a demangled stack backtrace of the caller function to FILE* out. */
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static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames = 63)
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{
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fprintf(out, "stack trace:\n");
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// storage array for stack trace address data
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void* addrlist[max_frames+1];
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// retrieve current stack addresses
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int addrlen = backtrace(addrlist, sizeof(addrlist) / sizeof(void*));
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if (addrlen == 0) {
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fprintf(out, " <empty, possibly corrupt>\n");
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return;
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}
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// resolve addresses into strings containing "filename(function+address)",
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// this array must be free()-ed
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char** symbollist = backtrace_symbols(addrlist, addrlen);
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// allocate string which will be filled with the demangled function name
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size_t funcnamesize = 256;
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char* funcname = (char*)malloc(funcnamesize);
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// iterate over the returned symbol lines. skip the first, it is the
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// address of this function.
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for (int i = 1; i < addrlen; i++)
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{
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char *begin_name = 0, *begin_offset = 0, *end_offset = 0;
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// find parentheses and +address offset surrounding the mangled name:
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// ./module(function+0x15c) [0x8048a6d]
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for (char *p = symbollist[i]; *p; ++p)
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{
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if (*p == '(')
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begin_name = p;
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else if (*p == '+')
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begin_offset = p;
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else if (*p == ')' && begin_offset) {
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end_offset = p;
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break;
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}
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}
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if (begin_name && begin_offset && end_offset
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&& begin_name < begin_offset)
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{
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*begin_name++ = '\0';
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*begin_offset++ = '\0';
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*end_offset = '\0';
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// mangled name is now in [begin_name, begin_offset) and caller
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// offset in [begin_offset, end_offset). now apply
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// __cxa_demangle():
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int status;
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char* ret = abi::__cxa_demangle(begin_name,
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funcname, &funcnamesize, &status);
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if (status == 0) {
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funcname = ret; // use possibly realloc()-ed string
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fprintf(out, " %s : %s+%s\n",
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symbollist[i], funcname, begin_offset);
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}
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else {
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// demangling failed. Output function name as a C function with
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// no arguments.
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fprintf(out, " %s : %s()+%s\n",
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symbollist[i], begin_name, begin_offset);
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}
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}
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else
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{
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// couldn't parse the line? print the whole line.
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fprintf(out, " %s\n", symbollist[i]);
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}
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}
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free(funcname);
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free(symbollist);
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}
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#endif // _STACKTRACE_H_
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