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Improve backtraces

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We're now able to rewind the instruction pointer in x86 backtraces. This
helps ensure addr2line cannot print information about unrelated adjacent
code. I've restored -fno-schedule-insns2 in most cases because it really
does cause unpredictable breakage for backtraces.
This commit is contained in:
Justine Tunney 2024-05-30 15:11:45 -07:00
parent cd672e251f
commit 9b6718ac99
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GPG key ID: BE714B4575D6E328
11 changed files with 118 additions and 24 deletions
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19
examples/crashreport.c
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@ -7,6 +7,7 @@
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/calls/calls.h"
#include "libc/intrin/kprintf.h"
#include "libc/math.h"
#include "libc/runtime/runtime.h"
@ -26,6 +27,13 @@
* o//examples/crashreport.com
*/
int Divide(int x, int y) {
volatile int z = 0; // force creation of stack frame
return x / y + z;
}
int (*pDivide)(int, int) = Divide;
dontubsan int main(int argc, char *argv[]) {
kprintf("----------------\n");
kprintf(" THIS IS A TEST \n");
@ -34,12 +42,7 @@ dontubsan int main(int argc, char *argv[]) {
ShowCrashReports();
volatile double a = 0;
volatile double b = 23;
volatile double c = exp(b) / a;
(void)c;
volatile int x = 0;
volatile int y = 1 / x;
return y;
pDivide(1, 0);
pDivide(2, 0);
pDivide(3, 0);
}