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Currently, to ensure OAS2FUNC results are assigned in the correct order, they're always assigned to temporary variables. However, these temporary variables are typed based on the destination type, which may require an interface conversion. This means walk may have to then introduce a second set of temporaries to ensure result parameters are all copied out of the results area, before it emits calls to runtime conversion functions. That's just silly. Instead, this CL changes order to allocate the result temporaries with the same type as the function returns in the first place, and then assign them one at a time to their destinations, with conversions as needed. While here, also fix an order-of-evaluation issue with has-ok assignments that I almost added to multi-value function call assignments, and add tests for each. Change-Id: I9f4e962425fe3c5e3305adbbfeae2c7f253ec365 Reviewed-on: https://go-review.googlesource.com/c/go/+/284220 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
168 lines
2.3 KiB
Go
168 lines
2.3 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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p10()
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p11()
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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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//go:noinline
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func fp() (*int, int) { return nil, 42 }
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func p10() {
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p := new(int)
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p, *p = fp()
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}
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func p11() {
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var i interface{}
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p := new(bool)
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p, *p = i.(*bool)
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}
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