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/* -*-mode:c++;c-file-style:"bsd";c-basic-offset:4;indent-tabs-mode:nil-*-
* Returns rating 0-4 of backtrace file on stdout.
* 4 - backtrace with complete or almost-complete debuginfos
* 0 - useless backtrace with no debuginfos
* Compile:
* gcc abrt-rate-backtrace.c -std=c99 -o abrt-rate-backtrace
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
// the (possibly truncated to length n) string into it.
static char* xstrndup(const char *s, int n)
{
int m;
char *t;
/* We can just xmalloc(n+1) and strncpy into it, */
/* but think about xstrndup("abc", 10000) wastage! */
m = n;
t = (char*) s;
while (m) {
if (!*t) break;
m--;
t++;
}
n -= m;
t = (char*) malloc(n + 1);
t[n] = '\0';
return (char*) memcpy(t, s, n);
}
enum LineRating
{
// RATING EXAMPLE
MissingEverything = 0, // #0 0x0000dead in ?? ()
MissingFunction = 1, // #0 0x0000dead in ?? () from /usr/lib/libfoobar.so.4
MissingLibrary = 2, // #0 0x0000dead in foobar()
MissingSourceFile = 3, // #0 0x0000dead in FooBar::FooBar () from /usr/lib/libfoobar.so.4
Good = 4, // #0 0x0000dead in FooBar::crash (this=0x0) at /home/user/foobar.cpp:204
BestRating = Good,
};
static enum LineRating rate_line(const char *line)
{
#define FOUND(x) (strstr(line, x) != NULL)
/* see the "enum LineRating" comments for possible combinations */
if (FOUND(" at "))
return Good;
const char *function = strstr(line, " in ");
if (function)
{
if (function[4] == '?') /* " in ??" does not count */
{
function = NULL;
}
}
bool library = FOUND(" from ");
if (function && library)
return MissingSourceFile;
if (function)
return MissingLibrary;
if (library)
return MissingFunction;
return MissingEverything;
#undef FOUND
}
/* returns number of "stars" to show */
static int rate_backtrace(const char *backtrace)
{
int i, len;
int multiplier = 0;
int rating = 0;
int best_possible_rating = 0;
char last_lvl = 0;
/* We look at the frames in reversed order, since:
* - rate_line() checks starting from the first line of the frame
* (note: it may need to look at more than one line!)
* - we increase weight (multiplier) for every frame,
* so that topmost frames end up most important
*/
len = 0;
for (i = strlen(backtrace) - 1; i >= 0; i--)
{
if (backtrace[i] == '#'
&& (backtrace[i+1] >= '0' && backtrace[i+1] <= '9') /* #N */
&& (i == 0 || backtrace[i-1] == '\n') /* it's at line start */
) {
/* For one, "#0 xxx" always repeats, skip repeats */
if (backtrace[i+1] == last_lvl)
continue;
last_lvl = backtrace[i+1];
char *s = xstrndup(backtrace + i + 1, len);
/* Replace tabs with spaces, rate_line() does not expect tabs.
* Actually, even newlines may be there. Example of multiline frame
* where " at SRCFILE" is on 2nd line:
* #3 0x0040b35d in __libc_message (do_abort=<value optimized out>,
* fmt=<value optimized out>) at ../sysdeps/unix/sysv/linux/libc_fatal.c:186
*/
for (char *p = s; *p; p++)
if (*p == '\t' || *p == '\n')
*p = ' ';
int lrate = rate_line(s);
multiplier++;
rating += lrate * multiplier;
best_possible_rating += BestRating * multiplier;
//log("lrate:%d rating:%d best_possible_rating:%d s:'%-.40s'", lrate, rating, best_possible_rating, s);
free(s);
len = 0; /* starting new line */
}
else
{
len++;
}
}
/* Bogus 'backtrace' with zero frames? */
if (best_possible_rating == 0)
return 0;
/* Returning number of "stars" to show */
if (rating*10 >= best_possible_rating*8) /* >= 0.8 */
return 4;
if (rating*10 >= best_possible_rating*6)
return 3;
if (rating*10 >= best_possible_rating*4)
return 2;
if (rating*10 >= best_possible_rating*2)
return 1;
return 0;
}
int main(int argc, char **argv)
{
if (argc != 2)
{
fprintf(stderr, "Usage: %s BACKTRACE_FILE\n", argv[0]);
return 1;
}
FILE *fp = fopen(argv[1], "r");
if (!fp)
{
fprintf(stderr, "Cannot open the input file.\n");
return 2;
}
fseek(fp, 0, SEEK_END);
size_t size = ftell(fp);
fseek(fp, 0, SEEK_SET);
char *file = malloc(size + 1);
if (!file)
{
fprintf(stderr, "Malloc error.\n");
return 3;
}
size_t read = fread(file, size, 1, fp);
if (read != 1)
{
fprintf(stderr, "Error while reading file.\n", argv[0]);
return 4;
}
fclose(fp);
file[size] = '\0';
int rating = 4;
/* Do not rate Python backtraces. */
if (NULL == strstr(file, "Local variables in innermost frame:\n"))
rating = rate_backtrace(file);
free(file);
fprintf(stdout, "%d", rating);
return 0;
}
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