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Add safe frame-pointer backtrace unwinder

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Nathan Slingerland 2024-09-16 11:00:37 -07:00 • committed by Qi Wang
parent 3a0d9cdadb
commit edc1576f03
13 changed files with 271 additions and 1 deletions
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42
src/prof_sys.c
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@ -3,6 +3,7 @@
#include "jemalloc/internal/buf_writer.h"
#include "jemalloc/internal/ctl.h"
#include "jemalloc/internal/malloc_io.h"
#include "jemalloc/internal/prof_data.h"
#include "jemalloc/internal/prof_sys.h"
@ -98,6 +99,45 @@ prof_backtrace_impl(void **vec, unsigned *len, unsigned max_len) {
_Unwind_Backtrace(prof_unwind_callback, &data);
}
#elif (defined(JEMALLOC_PROF_FRAME_POINTER))
JEMALLOC_DIAGNOSTIC_PUSH
JEMALLOC_DIAGNOSTIC_IGNORE_FRAME_ADDRESS
static void
prof_backtrace_impl(void **vec, unsigned *len, unsigned max_len) {
// stack_start - highest possible valid stack address (assumption: stacks grow downward)
// stack_end - current stack frame and lowest possible valid stack address
// (all earlier frames will be at higher addresses than this)
// always safe to get the current stack frame address
void** stack_end = (void**)__builtin_frame_address(0);
if (stack_end == NULL) {
*len = 0;
return;
}
static __thread void **stack_start = (void **)0; // thread local
if (stack_start == 0 || stack_end >= stack_start) {
stack_start = (void**)prof_thread_stack_start((uintptr_t)stack_end);
}
if (stack_start == 0 || stack_end >= stack_start) {
*len = 0;
return;
}
unsigned ii = 0;
void** fp = (void**)stack_end;
while (fp < stack_start && ii < max_len) {
vec[ii++] = fp[1];
void** fp_prev = fp;
fp = fp[0];
if (unlikely(fp <= fp_prev)) { // sanity check forward progress
break;
}
}
*len = ii;
}
JEMALLOC_DIAGNOSTIC_POP
#elif (defined(JEMALLOC_PROF_GCC))
JEMALLOC_DIAGNOSTIC_PUSH
JEMALLOC_DIAGNOSTIC_IGNORE_FRAME_ADDRESS
@ -484,7 +524,7 @@ prof_getpid(void) {
#endif
}
long
static long
prof_get_pid_namespace() {
long ret = 0;