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x86 stacktrace: Use __builtin_frame_address if possible

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This commit is contained in:
Shinichiro Hamaji 2017-05-09 17:11:51 +09:00
parent 0d78884a22
commit f278d734c1
1 changed files with 11 additions and 4 deletions
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15
src/stacktrace_x86-inl.h
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@ -93,16 +93,23 @@ static void **NextStackFrame(void **old_sp) {
// If you change this function, also change GetStackFrames below. // If you change this function, also change GetStackFrames below.
int GetStackTrace(void** result, int max_depth, int skip_count) { int GetStackTrace(void** result, int max_depth, int skip_count) {
void **sp; void **sp;
#ifdef __i386__
#ifdef __GNUC__
#if __GNUC__ * 100 + __GNUC_MINOR__ >= 402
#define USE_BUILTIN_FRAME_ADDRESS
#endif
#endif
#ifdef USE_BUILTIN_FRAME_ADDRESS
sp = reinterpret_cast<void**>(__builtin_frame_address(0));
#elif defined(__i386__)
// Stack frame format: // Stack frame format:
// sp[0] pointer to previous frame // sp[0] pointer to previous frame
// sp[1] caller address // sp[1] caller address
// sp[2] first argument // sp[2] first argument
// ... // ...
sp = (void **)&result - 2; sp = (void **)&result - 2;
#endif #elif defined(__x86_64__)
#ifdef __x86_64__
// __builtin_frame_address(0) can return the wrong address on gcc-4.1.0-k8 // __builtin_frame_address(0) can return the wrong address on gcc-4.1.0-k8
unsigned long rbp; unsigned long rbp;
// Move the value of the register %rbp into the local variable rbp. // Move the value of the register %rbp into the local variable rbp.