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https://github.com/golang/go
synced 2024-11-08 19:06:26 -07:00
cb05a0aa6a
Now that CaptureVars is gone, we can remove the extra code in escape analysis that only served to appease toolstash -cmp. Change-Id: I8c811834f3d966e76702e2d362e3de414c94bea6 Reviewed-on: https://go-review.googlesource.com/c/go/+/281544 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
// run
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test the cap predeclared function applied to channels.
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package main
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import (
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"strings"
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"unsafe"
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)
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type T chan int
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const ptrSize = unsafe.Sizeof((*byte)(nil))
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func main() {
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c := make(T, 10)
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if len(c) != 0 || cap(c) != 10 {
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println("chan len/cap ", len(c), cap(c), " want 0 10")
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panic("fail")
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}
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for i := 0; i < 3; i++ {
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c <- i
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}
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if len(c) != 3 || cap(c) != 10 {
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println("chan len/cap ", len(c), cap(c), " want 3 10")
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panic("fail")
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}
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c = make(T)
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if len(c) != 0 || cap(c) != 0 {
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println("chan len/cap ", len(c), cap(c), " want 0 0")
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panic("fail")
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}
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n := -1
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shouldPanic("makechan: size out of range", func() { _ = make(T, n) })
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shouldPanic("makechan: size out of range", func() { _ = make(T, int64(n)) })
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if ptrSize == 8 {
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// Test mem > maxAlloc
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var n2 int64 = 1 << 59
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shouldPanic("makechan: size out of range", func() { _ = make(T, int(n2)) })
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// Test elem.size*cap overflow
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n2 = 1<<63 - 1
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shouldPanic("makechan: size out of range", func() { _ = make(T, int(n2)) })
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} else {
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n = 1<<31 - 1
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shouldPanic("makechan: size out of range", func() { _ = make(T, n) })
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shouldPanic("makechan: size out of range", func() { _ = make(T, int64(n)) })
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}
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}
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func shouldPanic(str string, f func()) {
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defer func() {
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err := recover()
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if err == nil {
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panic("did not panic")
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}
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s := err.(error).Error()
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if !strings.Contains(s, str) {
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panic("got panic " + s + ", want " + str)
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}
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}()
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f()
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}
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