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https://github.com/golang/go
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8c8045fd38
Make sure that if a field comparison might panic, we evaluate (and short circuit if not equal) all previous fields, and don't evaluate any subsequent fields. Add a bunch more tests to the equality+panic checker. Update #8606 Change-Id: I6a159bbc8da5b2b7ee835c0cd1fc565575b58c46 Reviewed-on: https://go-review.googlesource.com/c/go/+/237919 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
// run
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// Copyright 2020 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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// Check to make sure that we compare fields in order. See issue 8606.
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package main
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import "fmt"
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func main() {
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type A [2]interface{}
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type A2 [6]interface{}
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type S struct{ x, y interface{} }
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type S2 struct{ x, y, z, a, b, c interface{} }
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type T1 struct {
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i interface{}
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a int64
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j interface{}
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}
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type T2 struct {
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i interface{}
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a, b, c int64
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j interface{}
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}
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type T3 struct {
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i interface{}
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s string
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j interface{}
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}
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b := []byte{1}
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for _, test := range []struct {
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panic bool
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a, b interface{}
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}{
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{false, A{1, b}, A{2, b}},
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{true, A{b, 1}, A{b, 2}},
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{false, A{1, b}, A{"2", b}},
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{true, A{b, 1}, A{b, "2"}},
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{false, A2{1, b}, A2{2, b}},
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{true, A2{b, 1}, A2{b, 2}},
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{false, A2{1, b}, A2{"2", b}},
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{true, A2{b, 1}, A2{b, "2"}},
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{false, S{1, b}, S{2, b}},
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{true, S{b, 1}, S{b, 2}},
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{false, S{1, b}, S{"2", b}},
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{true, S{b, 1}, S{b, "2"}},
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{false, S2{x: 1, y: b}, S2{x: 2, y: b}},
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{true, S2{x: b, y: 1}, S2{x: b, y: 2}},
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{false, S2{x: 1, y: b}, S2{x: "2", y: b}},
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{true, S2{x: b, y: 1}, S2{x: b, y: "2"}},
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{true, T1{i: b, a: 1}, T1{i: b, a: 2}},
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{false, T1{a: 1, j: b}, T1{a: 2, j: b}},
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{true, T2{i: b, a: 1}, T2{i: b, a: 2}},
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{false, T2{a: 1, j: b}, T2{a: 2, j: b}},
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{true, T3{i: b, s: "foo"}, T3{i: b, s: "bar"}},
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{false, T3{s: "foo", j: b}, T3{s: "bar", j: b}},
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{true, T3{i: b, s: "fooz"}, T3{i: b, s: "bar"}},
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{false, T3{s: "fooz", j: b}, T3{s: "bar", j: b}},
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} {
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f := func() {
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defer func() {
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if recover() != nil {
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panic(fmt.Sprintf("comparing %#v and %#v panicked", test.a, test.b))
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}
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}()
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if test.a == test.b {
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panic(fmt.Sprintf("values %#v and %#v should not be equal", test.a, test.b))
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}
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}
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if test.panic {
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shouldPanic(fmt.Sprintf("comparing %#v and %#v did not panic", test.a, test.b), f)
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} else {
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f() // should not panic
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}
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}
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}
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func shouldPanic(name string, f func()) {
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defer func() {
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if recover() == nil {
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panic(name)
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}
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}()
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f()
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}
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