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cmd/gc: fewer errors for wrong argument count

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Fixes #7675

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/85040044
This commit is contained in:
Jan Ziak 2014-04-16 22:42:09 -04:00 committed by Russ Cox
parent 1e2a61aee1
commit 1d2b71ce83
2 changed files with 79 additions and 0 deletions
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55
src/cmd/gc/typecheck.c
View file

@ -2167,6 +2167,31 @@ nokeys(NodeList *l)
return 1;
}
static int
hasddd(Type *t)
{
Type *tl;
for(tl=t->type; tl; tl=tl->down) {
if(tl->isddd)
return 1;
}
return 0;
}
static int
downcount(Type *t)
{
Type *tl;
int n;
n = 0;
for(tl=t->type; tl; tl=tl->down) {
n++;
}
return n;
}
/*
* typecheck assignment: type list = expression list
*/
@ -2177,6 +2202,7 @@ typecheckaste(int op, Node *call, int isddd, Type *tstruct, NodeList *nl, char *
Node *n;
int lno;
char *why;
int n1, n2;
lno = lineno;
@ -2186,6 +2212,15 @@ typecheckaste(int op, Node *call, int isddd, Type *tstruct, NodeList *nl, char *
n = N;
if(nl != nil && nl->next == nil && (n = nl->n)->type != T)
if(n->type->etype == TSTRUCT && n->type->funarg) {
if(!hasddd(tstruct)) {
n1 = downcount(tstruct);
n2 = downcount(n->type);
if(n2 > n1)
goto toomany;
if(n2 < n1)
goto notenough;
}
tn = n->type->type;
for(tl=tstruct->type; tl; tl=tl->down) {
if(tl->isddd) {
@ -2214,6 +2249,26 @@ typecheckaste(int op, Node *call, int isddd, Type *tstruct, NodeList *nl, char *
goto out;
}
n1 = downcount(tstruct);
n2 = count(nl);
if(!hasddd(tstruct)) {
if(n2 > n1)
goto toomany;
if(n2 < n1)
goto notenough;
}
else {
if(!isddd) {
if(n2 < n1-1)
goto notenough;
} else {
if(n2 > n1)
goto toomany;
if(n2 < n1)
goto notenough;
}
}
for(tl=tstruct->type; tl; tl=tl->down) {
t = tl->type;
if(tl->isddd) {

24
test/fixedbugs/issue7675.go Normal file
View file

@ -0,0 +1,24 @@
// errorcheck
// Copyright 2014 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.
// Issue 7675: fewer errors for wrong argument count
package p
func f(string, int, float64, string)
func g(string, int, float64, ...string)
func main() {
f(1, 0.5, "hello") // ERROR "not enough arguments"
f("1", 2, 3.1, "4")
f(1, 0.5, "hello", 4, 5) // ERROR "too many arguments"
g(1, 0.5) // ERROR "not enough arguments"
g("1", 2, 3.1)
g(1, 0.5, []int{3, 4}...) // ERROR "not enough arguments"
g("1", 2, 3.1, "4", "5")
g(1, 0.5, "hello", 4, []int{5, 6}...) // ERROR "too many arguments"
}