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Use signals to create the stack trace.

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This commit is contained in:
Christoffer Lerno
2023-11-20 14:51:21 +01:00
committed by Christoffer Lerno
parent 7c15cf2788
commit b8db118e64
2 changed files with 18 additions and 8 deletions
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24
lib/std/os/posix/process.c3
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@@ -55,20 +55,30 @@ const CInt __W_CONTINUED = 0xffff;
const CInt WNOHANG = 1;
const CInt WUNTRACES = 2;
JmpBuf backtrace_jmpbuf @local;
fn CInt backtrace(void** buffer, CInt size) @extern("backtrace") @weak
{
if (size < 1) return 0;
// Loop through the return addresses until we hit a signal.
// This avoids using the frame address.
SignalFunction restore_backtrace = fn void(CInt) {
libc::longjmp(&backtrace_jmpbuf, 1);
};
SignalFunction sig_bus = libc::signal(libc::SIGBUS, restore_backtrace);
SignalFunction sig_segv = libc::signal(libc::SIGSEGV, restore_backtrace);
SignalFunction sig_ill = libc::signal(libc::SIGILL, restore_backtrace);
void*[128] buffer_first;
CInt i;
int i = 0;
for (i = 0; i < size; i++)
{
uptr frame = (uptr)builtin::get_frameaddress(i + 1);
// This is a hack. Unfortunately glibc won't set the
// frame address to 0, but it contains argc. Here we assume less than 512 arguments
// to the program and hope no frame is in the 0x00 - 0x1FF range.
if (frame < 0x200) break;
if (libc::setjmp(&backtrace_jmpbuf) == 1) break;
buffer[i] = builtin::get_returnaddress(i);
if (!buffer[i]) break;
}
return i;
libc::signal(libc::SIGBUS, sig_bus);
libc::signal(libc::SIGSEGV, sig_segv);
libc::signal(libc::SIGILL, sig_ill);
return i;
}

2
src/version.h
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@@ -1 +1 @@
#define COMPILER_VERSION "0.4.709"
#define COMPILER_VERSION "0.4.710"