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Handle (empty) backtrace when thread is not born yet.

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This commit is contained in:
Samuel Williams 2019-06-06 09:54:29 +12:00
parent 5855af73b8
commit 9cb4e7725f
1 changed files with 6 additions and 0 deletions
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6
vm_backtrace.c
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@ -451,6 +451,12 @@ backtrace_each(const rb_execution_context_t *ec,
const rb_control_frame_t *cfp; const rb_control_frame_t *cfp;
ptrdiff_t size, i; ptrdiff_t size, i;
// In the case the thread vm_stack or cfp is not initialized, there is no backtrace.
if (start_cfp == NULL) {
init(arg, 0);
return;
}
/* <- start_cfp (end control frame) /* <- start_cfp (end control frame)
* top frame (dummy) * top frame (dummy)
* top frame (dummy) * top frame (dummy)