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-rw-r--r--test/fixedbugs/issue4316.go64
1 files changed, 64 insertions, 0 deletions
diff --git a/test/fixedbugs/issue4316.go b/test/fixedbugs/issue4316.go
new file mode 100644
index 0000000..de9a61b
--- /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()
+}