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initialize kw special local var.

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A method which has keyword parameters has an implicit local variable
to specify which keywords are (un)specified.

vm_call_iseq_setup_kwparm_nokwarg() is special function to invoke
a ISeq method without any keyword arguments. However, it should
also initialize the special local var. Without this initialization,
the implicit lvar can points a freed (T_NONE) object.
This commit is contained in:
Koichi Sasada 2019-11-09 09:59:32 +09:00
parent c5b4d2a259
commit 21f7cca2c6
1 changed files with 4 additions and 1 deletions
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5
vm_insnhelper.c
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@ -2073,9 +2073,12 @@ vm_call_iseq_setup_kwparm_nokwarg(rb_execution_context_t *ec, rb_control_frame_t
VALUE * const argv = cfp->sp - calling->argc;
VALUE * const klocals = argv + kw_param->bits_start - kw_param->num;
for (int i=0; i<kw_param->num; i++) {
int i;
for (i=0; i<kw_param->num; i++) {
klocals[i] = kw_param->default_values[i];
}
klocals[i] = INT2FIX(0); // kw specify flag
/* NOTE: don't need to setup (clear) unspecified bits
because no code check it.
klocals[kw_param->num] = INT2FIX(0); */