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gc: function argument ordering bug

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Fixes #370.

R=ken2
https://golang.org/cl/163097
This commit is contained in:
Russ Cox 2009-12-02 23:54:51 -08:00
parent 8777759f59
commit 272d156357
2 changed files with 43 additions and 5 deletions
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10
src/cmd/gc/walk.c
View File

@ -1875,7 +1875,7 @@ reorder1(NodeList *all)
{
Node *f, *a, *n;
NodeList *l, *r, *g;
int c, t;
int c, d, t;
c = 0; // function calls
t = 0; // total parameters
@ -1891,17 +1891,17 @@ reorder1(NodeList *all)
return all;
g = nil; // fncalls assigned to tempnames
f = N; // one fncall assigned to stack
f = N; // last fncall assigned to stack
r = nil; // non fncalls and tempnames assigned to stack
d = 0;
for(l=all; l; l=l->next) {
n = l->n;
ullmancalc(n);
if(n->ullman < UINF) {
r = list(r, n);
continue;
}
if(f == N) {
d++;
if(d == c) {
f = n;
continue;
}

38
test/fixedbugs/bug221.go Normal file
View File

@ -0,0 +1,38 @@
// $G $D/$F.go && $L $F.$A && ./$A.out
// 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.
// function call arg reordering was picking out 1 call that
// didn't need to be in a temporary, but it was picking
// out the first call instead of the last call.
// http://code.google.com/p/go/issues/detail?id=370
package main
var gen = 'a'
func f(n int) string {
s := string(gen) + string(n+'A'-1);
gen++;
return s;
}
func g(x, y string) string {
return x + y
}
func main() {
s := f(1) + f(2);
if s != "aAbB" {
panic("BUG: bug221a: ", s);
}
s = g(f(3), f(4));
if s != "cCdD" {
panic("BUG: bug221b: ", s);
}
s = f(5) + f(6) + f(7) + f(8) + f(9);
if s != "eEfFgGhHiI" {
panic("BUG: bug221c: ", s);
}
}