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gc: double-check usage of ...

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Fixes #423.

R=ken2
https://golang.org/cl/180045
This commit is contained in:
Russ Cox 2009-12-15 14:26:50 -08:00
parent 0282cc5e74
commit d122bb2193
4 changed files with 34 additions and 5 deletions
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10
src/cmd/gc/dcl.c
View File

@ -961,7 +961,7 @@ findtype(NodeList *l)
}
NodeList*
checkarglist(NodeList *all)
checkarglist(NodeList *all, int input)
{
int named;
Node *n, *t, *nextt;
@ -1015,8 +1015,12 @@ checkarglist(NodeList *all)
if(n != N)
n = newname(n->sym);
n = nod(ODCLFIELD, n, t);
if(l->next != nil && n->right != N && n->right->op == OTYPE && isddd(n->right->type))
yyerror("only last argument can have type ...");
if(n->right != N && n->right->op == OTYPE && isddd(n->right->type)) {
if(!input)
yyerror("cannot use ... in output argument list");
else if(l->next != nil)
yyerror("can only use ... as final argument in list");
}
l->n = n;
}
return all;

2
src/cmd/gc/go.h
View File

@ -955,7 +955,7 @@ Type* newtype(Sym*);
Type* oldtype(Sym*);
void fninit(NodeList*);
Node* nametodcl(Node*, Type*);
NodeList* checkarglist(NodeList*);
NodeList* checkarglist(NodeList*, int);
void checkwidth(Type*);
void defercheckwidth(void);
void resumecheckwidth(void);

8
src/cmd/gc/go.y
View File

@ -1070,6 +1070,7 @@ fndcl:
{
Node *n;
$3 = checkarglist($3, 1);
$$ = nod(ODCLFUNC, N, N);
$$->nname = $1;
if($3 == nil && $5 == nil)
@ -1085,6 +1086,8 @@ fndcl:
{
Node *rcvr, *t;
$2 = checkarglist($2, 0);
$6 = checkarglist($6, 1);
$$ = N;
if($2 == nil) {
yyerror("method has no receiver");
@ -1113,6 +1116,7 @@ fndcl:
fntype:
LFUNC '(' oarg_type_list_ocomma ')' fnres
{
$3 = checkarglist($3, 1);
$$ = nod(OTFUNC, N, N);
$$->list = $3;
$$->rlist = $5;
@ -1140,6 +1144,7 @@ fnres:
}
| '(' oarg_type_list_ocomma ')'
{
$2 = checkarglist($2, 0);
$$ = $2;
}
@ -1280,6 +1285,7 @@ indcl:
'(' oarg_type_list_ocomma ')' fnres
{
// without func keyword
$2 = checkarglist($2, 0);
$$ = nod(OTFUNC, fakethis(), N);
$$->list = $2;
$$->rlist = $4;
@ -1320,7 +1326,7 @@ oarg_type_list_ocomma:
}
| arg_type_list ocomma
{
$$ = checkarglist($1);
$$ = $1;
}
/*

19
test/fixedbugs/bug228.go Normal file
View File

@ -0,0 +1,19 @@
// errchk $G -e $D/$F.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
func f(x int, y ...) // ok
func g(x int, y float) (...) // ERROR "[.][.][.]"
func h(x, y ...) // ERROR "[.][.][.]"
func i(x int, y ..., z float) // ERROR "[.][.][.]"
var x ...; // ERROR "[.][.][.]|syntax"
type T ...; // ERROR "[.][.][.]|syntax"