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gc: fix unsafe.Sizeof on ideal constants
R=ken2 CC=golang-dev https://golang.org/cl/1280041
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2034f72139
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@ -32,9 +32,8 @@ unsafenmagic(Node *fn, NodeList *args)
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if(strcmp(s->name, "Sizeof") == 0) {
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typecheck(&r, Erv);
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defaultlit(&r, T);
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tr = r->type;
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if(r->op == OLITERAL && r->val.ctype == CTSTR)
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tr = types[TSTRING];
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if(tr == T)
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goto no;
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v = tr->width;
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@ -49,9 +48,8 @@ unsafenmagic(Node *fn, NodeList *args)
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}
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if(strcmp(s->name, "Alignof") == 0) {
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typecheck(&r, Erv);
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defaultlit(&r, T);
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tr = r->type;
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if(r->op == OLITERAL && r->val.ctype == CTSTR)
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tr = types[TSTRING];
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if(tr == T)
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goto no;
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36
test/fixedbugs/bug279.go
Normal file
36
test/fixedbugs/bug279.go
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@ -0,0 +1,36 @@
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// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// http://code.google.com/p/go/issues/detail?id=799
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package main
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import "unsafe"
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func main() {
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n := unsafe.Sizeof(0)
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if n != 4 && n != 8 {
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println("BUG sizeof 0", n)
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return
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}
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n = unsafe.Alignof(0)
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if n != 4 && n != 8 {
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println("BUG alignof 0", n)
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return
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}
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n = unsafe.Sizeof("")
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if n != 8 && n != 16 {
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println("BUG sizeof \"\"", n)
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return
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}
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n = unsafe.Alignof("")
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if n != 4 && n != 8 {
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println("BUG alignof \"\"", n)
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return
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}
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}
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