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cmd/gc: clean up string index errors

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Unify with array/slice errors, which were already good.

Fixes #4232.

R=ken2
CC=golang-dev
https://golang.org/cl/7271046
This commit is contained in:
Russ Cox 2013-02-03 02:01:05 -05:00
parent 4ad505d102
commit d82dcadb57
3 changed files with 55 additions and 18 deletions
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34
src/cmd/gc/typecheck.c
View file

@ -832,23 +832,34 @@ reswitch:
yyerror("invalid operation: %N (index of type %T)", n, t);
goto error;
case TSTRING:
case TARRAY:
defaultlit(&n->right, T);
n->type = t->type;
if(t->etype == TSTRING)
n->type = types[TUINT8];
else
n->type = t->type;
why = "string";
if(t->etype == TARRAY) {
if(isfixedarray(t))
why = "array";
else
why = "slice";
}
if(n->right->type != T && !isint[n->right->type->etype]) {
yyerror("non-integer array index %N", n->right);
yyerror("non-integer %s index %N", why, n->right);
break;
}
if(n->right->op == OLITERAL) {
if(mpgetfix(n->right->val.u.xval) < 0) {
why = isfixedarray(t) ? "array" : "slice";
if(mpgetfix(n->right->val.u.xval) < 0)
yyerror("invalid %s index %N (index must be non-negative)", why, n->right);
} else if(isfixedarray(t) && t->bound > 0 && mpgetfix(n->right->val.u.xval) >= t->bound)
else if(isfixedarray(t) && t->bound > 0 && mpgetfix(n->right->val.u.xval) >= t->bound)
yyerror("invalid array index %N (out of bounds for %d-element array)", n->right, t->bound);
else if(mpcmpfixfix(n->right->val.u.xval, maxintval[TINT]) > 0) {
why = isfixedarray(t) ? "array" : "slice";
else if(isconst(n->left, CTSTR) && mpgetfix(n->right->val.u.xval) >= n->left->val.u.sval->len)
yyerror("invalid string index %N (out of bounds for %d-byte string)", n->right, n->left->val.u.sval->len);
else if(mpcmpfixfix(n->right->val.u.xval, maxintval[TINT]) > 0)
yyerror("invalid %s index %N (index too large)", why, n->right);
}
}
break;
@ -860,13 +871,6 @@ reswitch:
n->type = t->type;
n->op = OINDEXMAP;
break;
case TSTRING:
defaultlit(&n->right, types[TUINT]);
if(n->right->type != T && !isint[n->right->type->etype])
yyerror("non-integer string index %N", n->right);
n->type = types[TUINT8];
break;
}
goto ret;

6
test/fixedbugs/bug205.go
View file

@ -11,8 +11,8 @@ var s string;
var m map[string]int;
func main() {
println(t["hi"]); // ERROR "integer"
println(s["hi"]); // ERROR "integer" "to type uint"
println(m[0]); // ERROR "map index"
println(t["hi"]); // ERROR "non-integer slice index"
println(s["hi"]); // ERROR "non-integer string index"
println(m[0]); // ERROR "as type string in map index"
}

33
test/fixedbugs/issue4232.go Normal file
View file

@ -0,0 +1,33 @@
// errorcheck
// Copyright 2013 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 p
func f() {
var a [10]int
_ = a[-1] // ERROR "invalid array index -1"
_ = a[-1:] // ERROR "invalid slice index -1"
_ = a[:-1] // ERROR "invalid slice index -1"
_ = a[10] // ERROR "invalid array index 10"
var s []int
_ = s[-1] // ERROR "invalid slice index -1"
_ = s[-1:] // ERROR "invalid slice index -1"
_ = s[:-1] // ERROR "invalid slice index -1"
_ = s[10]
const c = "foo"
_ = c[-1] // ERROR "invalid string index -1"
_ = c[-1:] // ERROR "invalid slice index -1"
_ = c[:-1] // ERROR "invalid slice index -1"
_ = c[3] // ERROR "invalid string index 3"
var t string
_ = t[-1] // ERROR "invalid string index -1"
_ = t[-1:] // ERROR "invalid slice index -1"
_ = t[:-1] // ERROR "invalid slice index -1"
_ = t[3]
}