package main
+import (
+ "strings"
+ "unsafe"
+)
+
+type T chan int
+
+const ptrSize = unsafe.Sizeof((*byte)(nil))
+
func main() {
- c := make(chan int, 10)
+ c := make(T, 10)
if len(c) != 0 || cap(c) != 10 {
println("chan len/cap ", len(c), cap(c), " want 0 10")
panic("fail")
panic("fail")
}
- c = make(chan int)
+ c = make(T)
if len(c) != 0 || cap(c) != 0 {
println("chan len/cap ", len(c), cap(c), " want 0 0")
panic("fail")
}
+
+ n := -1
+ shouldPanic("makechan: size out of range", func() { _ = make(T, n) })
+ shouldPanic("makechan: size out of range", func() { _ = make(T, int64(n)) })
+ if ptrSize == 8 {
+ // Test mem > maxAlloc
+ var n2 int64 = 1 << 59
+ shouldPanic("makechan: size out of range", func() { _ = make(T, int(n2)) })
+ // Test elem.size*cap overflow
+ n2 = 1<<63 - 1
+ shouldPanic("makechan: size out of range", func() { _ = make(T, int(n2)) })
+ } else {
+ n = 1<<31 - 1
+ shouldPanic("makechan: size out of range", func() { _ = make(T, n) })
+ shouldPanic("makechan: size out of range", func() { _ = make(T, int64(n)) })
+ }
+}
+
+func shouldPanic(str string, f func()) {
+ defer func() {
+ err := recover()
+ if err == nil {
+ panic("did not panic")
+ }
+ s := err.(error).Error()
+ if !strings.Contains(s, str) {
+ panic("got panic " + s + ", want " + str)
+ }
+ }()
+
+ f()
}