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// run
// Copyright 2013 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.
package main
import (
"strings"
"unsafe"
)
type T []int
func main() {
n := -1
shouldPanic("len out of range", func() { _ = make(T, n) })
shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
shouldPanic("len out of range", func() { _ = make(T, int64(n)) })
shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
testMakeInAppend(n)
var t *byte
if unsafe.Sizeof(t) == 8 {
// Test mem > maxAlloc
var n2 int64 = 1 << 59
shouldPanic("len out of range", func() { _ = make(T, int(n2)) })
shouldPanic("cap out of range", func() { _ = make(T, 0, int(n2)) })
testMakeInAppend(int(n2))
// Test elem.size*cap overflow
n2 = 1<<63 - 1
shouldPanic("len out of range", func() { _ = make(T, int(n2)) })
shouldPanic("cap out of range", func() { _ = make(T, 0, int(n2)) })
testMakeInAppend(int(n2))
var x uint64 = 1<<64 - 1
shouldPanic("len out of range", func() { _ = make([]byte, x) })
shouldPanic("cap out of range", func() { _ = make(T, 0, x) })
testMakeInAppend(int(x))
} else {
n = 1<<31 - 1
shouldPanic("len out of range", func() { _ = make(T, n) })
shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
shouldPanic("len out of range", func() { _ = make(T, int64(n)) })
shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
testMakeInAppend(n)
var x uint64 = 1<<32 - 1
shouldPanic("len out of range", func() { _ = make([]byte, x) })
shouldPanic("cap out of range", func() { _ = make(T, 0, x) })
testMakeInAppend(int(x))
}
}
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()
}
// Test make in append panics since the gc compiler optimizes makes in appends.
func testMakeInAppend(n int) {
lengths := []int{0, 1}
for _, length := range lengths {
t := make(T, length)
shouldPanic("len out of range", func() { _ = append(t, make(T, n)...) })
shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, n)...) })
shouldPanic("len out of range", func() { _ = append(t, make(T, int64(n))...) })
shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, int64(n))...) })
shouldPanic("len out of range", func() { _ = append(t, make(T, uint64(n))...) })
shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, uint64(n))...) })
shouldPanic("len out of range", func() { _ = append(t, make(T, int(n))...) })
shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, int(n))...) })
shouldPanic("len out of range", func() { _ = append(t, make(T, uint(n))...) })
shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, uint(n))...) })
}
}
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