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gc: implement new return restriction

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R=ken2
CC=golang-dev
https://golang.org/cl/5245056
This commit is contained in:
Russ Cox 2011-10-13 12:17:55 -04:00
parent 06862617c1
commit c18d1a78a4
1 changed files with 12 additions and 0 deletions
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12
src/cmd/gc/go.y
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@ -1546,6 +1546,18 @@ non_dcl_stmt:
{
$$ = nod(ORETURN, N, N);
$$->list = $2;
if($$->list == nil) {
NodeList *l;
for(l=curfn->dcl; l; l=l->next) {
if(l->n->class == PPARAM)
continue;
if(l->n->class != PPARAMOUT)
break;
if(l->n->sym->def != l->n)
yyerror("%s is shadowed during return", l->n->sym->name);
}
}
}
stmt_list: