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https://github.com/golang/go
synced 2024-11-23 09:10:08 -07:00
1cde87b312
Add temporaries to reorder the assignment for OAS2XXX nodes. This makes orderstmt(), rewrite a, b, c = ... as tmp1, tmp2, tmp3 = ... a, b, c = tmp1, tmp2, tmp3 and a, ok = ... as t1, t2 = ... a = t1 ok = t2 Fixes #13433. Change-Id: Id0f5956e3a254d0a6f4b89b5f7b0e055b1f0e21f Reviewed-on: https://go-review.googlesource.com/34713 Run-TryBot: Dhananjay Nakrani <dhananjayn@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
152 lines
2.1 KiB
Go
152 lines
2.1 KiB
Go
// run
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// Copyright 2011 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 reordering of assignments.
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package main
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import "fmt"
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func main() {
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p1()
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p2()
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p3()
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p4()
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p5()
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p6()
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p7()
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p8()
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p9()
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}
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var gx []int
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func f(i int) int {
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return gx[i]
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}
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func check(x []int, x0, x1, x2 int) {
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if x[0] != x0 || x[1] != x1 || x[2] != x2 {
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fmt.Printf("%v, want %d,%d,%d\n", x, x0, x1, x2)
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panic("failed")
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}
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}
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func check3(x, y, z, xx, yy, zz int) {
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if x != xx || y != yy || z != zz {
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fmt.Printf("%d,%d,%d, want %d,%d,%d\n", x, y, z, xx, yy, zz)
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panic("failed")
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}
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}
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func p1() {
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x := []int{1, 2, 3}
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i := 0
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i, x[i] = 1, 100
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_ = i
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check(x, 100, 2, 3)
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}
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func p2() {
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x := []int{1, 2, 3}
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i := 0
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x[i], i = 100, 1
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_ = i
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check(x, 100, 2, 3)
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}
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func p3() {
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x := []int{1, 2, 3}
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y := x
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gx = x
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x[1], y[0] = f(0), f(1)
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check(x, 2, 1, 3)
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}
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func p4() {
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x := []int{1, 2, 3}
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y := x
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gx = x
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x[1], y[0] = gx[0], gx[1]
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check(x, 2, 1, 3)
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}
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func p5() {
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x := []int{1, 2, 3}
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y := x
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p := &x[0]
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q := &x[1]
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*p, *q = x[1], y[0]
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check(x, 2, 1, 3)
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}
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func p6() {
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x := 1
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y := 2
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z := 3
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px := &x
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py := &y
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*px, *py = y, x
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check3(x, y, z, 2, 1, 3)
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}
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func f1(x, y, z int) (xx, yy, zz int) {
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return x, y, z
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}
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func f2() (x, y, z int) {
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return f1(2, 1, 3)
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}
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func p7() {
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x, y, z := f2()
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check3(x, y, z, 2, 1, 3)
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}
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func p8() {
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m := make(map[int]int)
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m[0] = len(m)
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if m[0] != 0 {
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panic(m[0])
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}
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}
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// Issue #13433: Left-to-right assignment of OAS2XXX nodes.
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func p9() {
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var x bool
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// OAS2FUNC
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x, x = fn()
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checkOAS2XXX(x, "x, x = fn()")
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// OAS2RECV
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var c = make(chan bool, 10)
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c <- false
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x, x = <-c
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checkOAS2XXX(x, "x, x <-c")
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// OAS2MAPR
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var m = map[int]bool{0: false}
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x, x = m[0]
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checkOAS2XXX(x, "x, x = m[0]")
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// OAS2DOTTYPE
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var i interface{} = false
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x, x = i.(bool)
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checkOAS2XXX(x, "x, x = i.(bool)")
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}
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//go:noinline
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func fn() (bool, bool) { return false, true }
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// checks the order of OAS2XXX.
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func checkOAS2XXX(x bool, s string) {
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if !x {
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fmt.Printf("%s; got=(false); want=(true)\n", s)
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panic("failed")
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}
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}
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