Imported Upstream version 1.1~hg20130304upstream/1.1_hg20130304

1 files changed, 64 insertions, 0 deletions

diff --git a/test/fixedbugs/issue4316.go b/test/fixedbugs/issue4316.go
new file mode 100644
index 000000000..bb18a0896
--- /dev/null
+++ b/test/fixedbugs/issue4316.go
@@ -0,0 +1,64 @@
+// run
+
+// Copyright 2012 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.
+
+// Issue 4316: the stack overflow check in the linker
+// is confused when it encounters a split-stack function
+// that needs 0 bytes of stack space.
+
+package main
+
+type Peano *Peano
+
+func makePeano(n int) *Peano {
+	if n == 0 {
+		return nil
+	}
+	p := Peano(makePeano(n - 1))
+	return &p
+}
+
+var countArg Peano
+var countResult int
+
+func countPeano() {
+	if countArg == nil {
+		countResult = 0
+		return
+	}
+	countArg = *countArg
+	countPeano()
+	countResult++
+}
+
+var s = "(())"
+var pT = 0
+
+func p() {
+	if pT >= len(s) {
+		return
+	}
+	if s[pT] == '(' {
+		pT += 1
+		p()
+		if pT < len(s) && s[pT] == ')' {
+			pT += 1
+		} else {
+			return
+		}
+		p()
+	}
+}
+
+func main() {
+	countArg = makePeano(4096)
+	countPeano()
+	if countResult != 4096 {
+		println("countResult =", countResult)
+		panic("countResult != 4096")
+	}
+
+	p()
+}