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Merge pull request #6076 from evsh/warn-if-no-function-names

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Warn if no function names are present in the stacktrace
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sledgehammer999 2017-01-19 00:33:12 +02:00 committed by GitHub
commit 7c75ee20e3
1 changed files with 60 additions and 52 deletions
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112
src/app/stacktrace.h
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@ -15,78 +15,86 @@ static inline void print_stacktrace(FILE *out = stderr, unsigned int max_frames
fprintf(out, "stack trace:\n");
// storage array for stack trace address data
void* addrlist[max_frames+1];
void *addrlist[max_frames + 1];
// retrieve current stack addresses
int addrlen = backtrace(addrlist, sizeof(addrlist) / sizeof(void*));
int addrlen = backtrace(addrlist, sizeof(addrlist) / sizeof(void *));
if (addrlen == 0) {
fprintf(out, " <empty, possibly corrupt>\n");
return;
fprintf(out, " <empty, possibly corrupt>\n");
return;
}
// resolve addresses into strings containing "filename(function+address)",
// this array must be free()-ed
char** symbollist = backtrace_symbols(addrlist, addrlen);
char * *symbollist = backtrace_symbols(addrlist, addrlen);
// allocate string which will be filled with the demangled function name
size_t funcnamesize = 256;
char* funcname = (char*)malloc(funcnamesize);
char *funcname = (char *)malloc(funcnamesize);
int functionNamesFound = 0;
// iterate over the returned symbol lines. skip the first, it is the
// address of this function.
for (int i = 2; i < addrlen; i++)
{
char *begin_name = 0, *begin_offset = 0, *end_offset = 0;
for (int i = 2; i < addrlen; i++) {
char *begin_name = 0, *begin_offset = 0, *end_offset = 0;
// find parentheses and +address offset surrounding the mangled name:
// ./module(function+0x15c) [0x8048a6d]
//fprintf(out, "%s TT\n", symbollist[i]);
for (char *p = symbollist[i]; *p; ++p)
{
if (*p == '(')
begin_name = p;
else if (*p == '+')
begin_offset = p;
else if (*p == ')' && begin_offset) {
end_offset = p;
break;
}
}
// find parentheses and +address offset surrounding the mangled name:
// ./module(function+0x15c) [0x8048a6d]
// fprintf(out, "%s TT\n", symbollist[i]);
for (char *p = symbollist[i]; *p; ++p) {
if (*p == '(') {
begin_name = p;
}
else if (*p == '+') {
begin_offset = p;
}
else if ((*p == ')') && begin_offset) {
end_offset = p;
break;
}
}
if (begin_name && begin_offset && end_offset
&& begin_name < begin_offset)
{
*begin_name++ = '\0';
*begin_offset++ = '\0';
*end_offset = '\0';
if (begin_name && begin_offset && end_offset
&& (begin_name < begin_offset)) {
*begin_name++ = '\0';
*begin_offset++ = '\0';
*end_offset = '\0';
// mangled name is now in [begin_name, begin_offset) and caller
// offset in [begin_offset, end_offset). now apply
// __cxa_demangle():
// mangled name is now in [begin_name, begin_offset) and caller
// offset in [begin_offset, end_offset). now apply
// __cxa_demangle():
int status;
char* ret = abi::__cxa_demangle(begin_name,
funcname, &funcnamesize, &status);
if (status == 0) {
funcname = ret; // use possibly realloc()-ed string
fprintf(out, " %s : %s+%s %s\n",
symbollist[i], funcname, begin_offset, ++end_offset);
}
else {
// demangling failed. Output function name as a C function with
// no arguments.
fprintf(out, " %s : %s()+%s %s\n",
symbollist[i], begin_name, begin_offset, ++end_offset);
}
}
else
{
// couldn't parse the line? print the whole line.
fprintf(out, " %s\n", symbollist[i]);
}
int status;
char *ret = abi::__cxa_demangle(begin_name,
funcname, &funcnamesize, &status);
if (status == 0) {
funcname = ret; // use possibly realloc()-ed string
fprintf(out, " %s : %s+%s %s\n",
symbollist[i], funcname, begin_offset, ++end_offset);
}
else {
// demangling failed. Output function name as a C function with
// no arguments.
fprintf(out, " %s : %s()+%s %s\n",
symbollist[i], begin_name, begin_offset, ++end_offset);
}
++functionNamesFound;
}
else {
// couldn't parse the line? print the whole line.
fprintf(out, " %s\n", symbollist[i]);
}
}
if (!functionNamesFound) {
fprintf(out, "There were no function names found in the stack trace\n."
"Seems like debug symbols are not installed, and the stack trace is useless.\n");
}
if (functionNamesFound < addrlen - 2) {
fprintf(out, "Consider installing debug symbols for packages containing files with empty"
" function names (i.e. empty braces \"()\") to make your stack trace more useful\n");
}
free(funcname);
free(symbollist);
}