gc: bug281 - bad overlap in stack copy

Fixes issue 807.

R=ken2
CC=golang-dev
http://codereview.appspot.com/1283041

1 files changed, 55 insertions, 0 deletions

diff --git a/test/fixedbugs/bug281.go b/test/fixedbugs/bug281.go
new file mode 100644
index 000000000..821b02825
--- /dev/null
+++ b/test/fixedbugs/bug281.go
@@ -0,0 +1,55 @@
+// $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=807
+
+package main
+
+type Point struct {
+	X, Y int64
+}
+
+type Rect struct {
+	Min, Max Point
+}
+
+func (p Point) Sub(q Point) Point {
+	return Point{p.X-q.X, p.Y-q.Y}
+}
+
+type Obj struct {
+	bbox Rect
+}
+
+func (o *Obj) Bbox() Rect {
+	return o.bbox
+}
+
+func (o *Obj) Points() [2]Point{
+	return [2]Point{o.bbox.Min, o.bbox.Max}
+}
+
+var x = 0
+
+func main() {
+	o := &Obj{Rect{Point{800, 0}, Point{}}}
+	p := Point{800, 300}
+	q := p.Sub(o.Bbox().Min)
+	if q.X != 0 || q.Y != 300 {
+		println("BUG dot: ", q.X, q.Y)
+		return
+	}
+	
+	q = p.Sub(o.Points()[0])
+	if q.X != 0 || q.Y != 300 {
+		println("BUG index const: ", q.X, q.Y)
+	}
+	
+	q = p.Sub(o.Points()[x])
+	if q.X != 0 || q.Y != 300 {
+		println("BUG index var: ", q.X, q.Y)
+	}
+}