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8g: bug272

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Fixes #589.

R=ken2
CC=golang-dev
https://golang.org/cl/1043042
This commit is contained in:
Russ Cox 2010-04-30 14:04:34 -07:00
parent 253fd30e66
commit c66b49845c
2 changed files with 62 additions and 13 deletions
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50
src/cmd/8g/cgen.c
View File

@ -430,6 +430,33 @@ flt2: // binary
return;
}
/*
* generate array index into res.
* n might be any size; res is 32-bit.
* returns Prog* to patch to panic call.
*/
Prog*
cgenindex(Node *n, Node *res)
{
Node tmp, lo, hi, zero;
Prog *p;
if(!is64(n->type)) {
cgen(n, res);
return nil;
}
tempname(&tmp, types[TINT64]);
cgen(n, &tmp);
split64(&tmp, &lo, &hi);
gmove(&lo, res);
if(debug['B'])
return nil;
nodconst(&zero, types[TINT32], 0);
gins(ACMPL, &hi, &zero);
return gbranch(AJNE, T);
}
/*
* address gen
* res = &n;
@ -442,7 +469,7 @@ agen(Node *n, Node *res)
Type *t;
uint32 w;
uint64 v;
Prog *p1;
Prog *p1, *p2;
if(debug['g']) {
dump("\nagen-res", res);
@ -489,20 +516,20 @@ agen(Node *n, Node *res)
break;
case OINDEX:
// TODO(rsc): uint64 indices
p2 = nil; // to be patched to panicindex.
w = n->type->width;
if(nr->addable) {
agenr(nl, &n3, res);
if(!isconst(nr, CTINT)) {
tempname(&tmp, types[TINT32]);
cgen(nr, &tmp);
p2 = cgenindex(nr, &tmp);
regalloc(&n1, tmp.type, N);
gmove(&tmp, &n1);
}
} else if(nl->addable) {
if(!isconst(nr, CTINT)) {
tempname(&tmp, types[TINT32]);
cgen(nr, &tmp);
p2 = cgenindex(nr, &tmp);
regalloc(&n1, tmp.type, N);
gmove(&tmp, &n1);
}
@ -510,7 +537,7 @@ agen(Node *n, Node *res)
agen(nl, &n3);
} else {
tempname(&tmp, types[TINT32]);
cgen(nr, &tmp);
p2 = cgenindex(nr, &tmp);
nr = &tmp;
agenr(nl, &n3, res);
regalloc(&n1, tmp.type, N);
@ -575,12 +602,7 @@ agen(Node *n, Node *res)
break;
}
// type of the index
t = types[TUINT32];
if(issigned[n1.type->etype])
t = types[TINT32];
regalloc(&n2, t, &n1); // i
regalloc(&n2, types[TINT32], &n1); // i
gmove(&n1, &n2);
regfree(&n1);
@ -595,6 +617,8 @@ agen(Node *n, Node *res)
nodconst(&n1, types[TUINT32], nl->type->bound);
gins(optoas(OCMP, types[TUINT32]), &n2, &n1);
p1 = gbranch(optoas(OLT, types[TUINT32]), T);
if(p2)
patch(p2, pc);
ginscall(panicindex, 0);
patch(p1, pc);
}
@ -613,8 +637,8 @@ agen(Node *n, Node *res)
p1->from.index = p1->from.type;
p1->from.type = p1->to.type + D_INDIR;
} else {
nodconst(&n1, t, w);
gins(optoas(OMUL, t), &n1, &n2);
nodconst(&n1, types[TUINT32], w);
gins(optoas(OMUL, types[TUINT32]), &n1, &n2);
gins(optoas(OADD, types[tptr]), &n2, &n3);
gmove(&n3, res);
}

25
test/fixedbugs/bug272.go Normal file
View File

@ -0,0 +1,25 @@
// $G $D/$F.go && $L $F.$A && ./$A.out
// Copyright 2010 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.
// http://code.google.com/p/go/issues/detail?id=589
package main
func main() {
n := int64(100)
x := make([]int, n)
x[99] = 234;
z := x[n-1]
if z != 234 {
println("BUG")
}
n |= 1<<32
defer func() {
recover()
}()
z = x[n-1]
println("BUG2")
}