mirror of
https://github.com/golang/go
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69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
// runoutput
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// Copyright 2012 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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// Issue 3866
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// runtime.equal failed to take padding between arguments and
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// return values into account, so in certain cases gc-generated
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// code will read a random bool from the stack as the result of
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// the comparison.
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// This program generates a lot of equality tests and hopes to
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// catch this.
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// NOTE: this program assumes comparing instance of T and T's
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// underlying []byte will make gc emit calls to runtime.equal,
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// and if gc optimizes this case, then the test will no longer
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// be correct (in the sense that it no longer tests runtime.equal).
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package main
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import (
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"bytes"
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"fmt"
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"strconv"
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"strings"
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)
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const ntest = 1024
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func main() {
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var decls, calls bytes.Buffer
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for i := 1; i <= ntest; i++ {
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s := strconv.Itoa(i)
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decls.WriteString(strings.Replace(decl, "$", s, -1))
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calls.WriteString(strings.Replace("call(test$)\n\t", "$", s, -1))
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}
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program = strings.Replace(program, "$DECLS", decls.String(), 1)
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program = strings.Replace(program, "$CALLS", calls.String(), 1)
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fmt.Print(program)
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}
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var program = `package main
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var count int
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func call(f func() bool) {
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if f() {
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count++
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}
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}
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$DECLS
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func main() {
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$CALLS
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if count != 0 {
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println("failed", count, "case(s)")
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}
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}
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`
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const decl = `
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type T$ [$]uint8
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func test$() bool {
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v := T${1}
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return v == [$]uint8{2} || v != [$]uint8{1}
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}`
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