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Add CC_BACKTRACE_BUILTIN for a stacktrace backend that works without needing an external library. Probably only works on x86/x86_64 and probably unreliable

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UnknownShadow200 2023-06-15 20:48:23 +10:00
parent 9f951893a1
commit a6e226ce94
1 changed files with 80 additions and 0 deletions
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80
src/Logger.c
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@ -365,6 +365,8 @@ void Logger_Backtrace(cc_string* trace, void* ctx) {
String_AppendConst(trace, "-- backtrace unimplemented --");
/* TODO implement backtrace using exc_unwind https://nixdoc.net/man-pages/IRIX/man3/exception.3.html */
}
#elif defined CC_BACKTRACE_BUILTIN
/* Implemented later at end of the file */
#elif defined CC_BUILD_POSIX
#include <execinfo.h>
void Logger_Backtrace(cc_string* trace, void* ctx) {
@ -1218,3 +1220,81 @@ void Logger_FailToStart(const char* raw_msg) {
Logger_Log(&msg);
Process_Exit(1);
}
#if defined CC_BACKTRACE_BUILTIN
static CC_NOINLINE void* GetReturnAddress(int level) {
/* "... a value of 0 yields the return address of the current function, a value of 1 yields the return address of the caller of the current function" */
switch(level) {
case 0: return __builtin_return_address(1);
case 1: return __builtin_return_address(2);
case 2: return __builtin_return_address(3);
case 3: return __builtin_return_address(4);
case 4: return __builtin_return_address(5);
case 5: return __builtin_return_address(6);
case 6: return __builtin_return_address(7);
case 7: return __builtin_return_address(8);
case 8: return __builtin_return_address(9);
case 9: return __builtin_return_address(10);
case 10: return __builtin_return_address(11);
case 11: return __builtin_return_address(12);
case 12: return __builtin_return_address(13);
case 13: return __builtin_return_address(14);
case 14: return __builtin_return_address(15);
case 15: return __builtin_return_address(16);
case 16: return __builtin_return_address(17);
case 17: return __builtin_return_address(18);
case 18: return __builtin_return_address(19);
case 19: return __builtin_return_address(20);
case 20: return __builtin_return_address(21);
default: return NULL;
}
}
static CC_NOINLINE void* GetFrameAddress(int level) {
/* "... a value of 0 yields the frame address of the current function, a value of 1 yields the frame address of the caller of the current function, and so forth." */
switch(level) {
case 0: return __builtin_frame_address(1);
case 1: return __builtin_frame_address(2);
case 2: return __builtin_frame_address(3);
case 3: return __builtin_frame_address(4);
case 4: return __builtin_frame_address(5);
case 5: return __builtin_frame_address(6);
case 6: return __builtin_frame_address(7);
case 7: return __builtin_frame_address(8);
case 8: return __builtin_frame_address(9);
case 9: return __builtin_frame_address(10);
case 10: return __builtin_frame_address(11);
case 11: return __builtin_frame_address(12);
case 12: return __builtin_frame_address(13);
case 13: return __builtin_frame_address(14);
case 14: return __builtin_frame_address(15);
case 15: return __builtin_frame_address(16);
case 16: return __builtin_frame_address(17);
case 17: return __builtin_frame_address(18);
case 18: return __builtin_frame_address(19);
case 19: return __builtin_frame_address(20);
case 20: return __builtin_frame_address(21);
default: return NULL;
}
}
void Logger_Backtrace(cc_string* trace, void* ctx) {
void* addrs[MAX_BACKTRACE_FRAMES];
int i, frames;
/* See https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html */
/* Note "Calling this function with a nonzero argument can have unpredictable effects, including crashing the calling program" */
/* So this probably only works on x86/x86_64 */
for (i = 0; GetFrameAddress(i + 1) && i < MAX_BACKTRACE_FRAMES; i++)
{
addrs[i] = GetReturnAddress(i);
if (!addrs[i]) break;
}
frames = i;
for (i = 0; i < frames; i++) {
DumpFrame(trace, addrs[i]);
}
String_AppendConst(trace, _NL);
}
#endif