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bpo-39114: Fix tracing of except handlers with name binding (GH-17769)

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When producing the bytecode of exception handlers with name binding (like `except Exception as e`) we need to produce a try-finally block to make sure that the name is deleted after the handler is executed to prevent cycles in the stack frame objects. The bytecode associated with this try-finally block does not have source lines associated and it was causing problems when the tracing functionality was running over it.
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Pablo Galindo 2020-01-02 11:38:44 +00:00 • committed by GitHub
parent 149175c6df
commit 04ec7a1f7a
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3 changed files with 50 additions and 1 deletions
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Python/ceval.c
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@ -3610,7 +3610,9 @@ exception_unwind:
PUSH(val);
PUSH(exc);
JUMPTO(handler);
if (_Py_TracingPossible(ceval)) {
if (_Py_TracingPossible(ceval) &&
((f->f_lasti < instr_lb || f->f_lasti >= instr_ub) ||
!(f->f_lasti == instr_lb || f->f_lasti < instr_prev))) {
/* Make sure that we trace line after exception */
instr_prev = INT_MAX;
}