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go/test/fixedbugs/issue43384.go
Matthew Dempsky 0c1a899a6c [dev.regabi] cmd/compile: fix defined-pointer method call check
The compiler has logic to check whether we implicitly dereferenced a
defined pointer while trying to select a method. However, rather than
checking whether there were any implicit dereferences of a defined
pointer, it was finding the innermost dereference/selector expression
and checking whether that was dereferencing a named pointer. Moreover,
it was only checking defined pointer declared in the package block.

This CL restructures the code to match go/types and gccgo's behavior.

Fixes #43384.

Change-Id: I7bddfe2515776d9480eb2c7286023d4c15423888
Reviewed-on: https://go-review.googlesource.com/c/go/+/280392
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
2020-12-30 04:38:20 +00:00

125 lines
1.9 KiB
Go

// errorcheck
// Copyright 2020 The Go Authors. All rights reserved. Use of this
// source code is governed by a BSD-style license that can be found in
// the LICENSE file.
package p
type T int
func (T) Mv() {}
func (*T) Mp() {}
type P1 struct{ T }
type P2 struct{ *T }
type P3 *struct{ T }
type P4 *struct{ *T }
func _() {
{
var p P1
p.Mv()
(&p).Mv()
(*&p).Mv()
p.Mp()
(&p).Mp()
(*&p).Mp()
}
{
var p P2
p.Mv()
(&p).Mv()
(*&p).Mv()
p.Mp()
(&p).Mp()
(*&p).Mp()
}
{
var p P3
p.Mv() // ERROR "undefined"
(&p).Mv() // ERROR "undefined"
(*&p).Mv() // ERROR "undefined"
(**&p).Mv()
(*p).Mv()
(&*p).Mv()
p.Mp() // ERROR "undefined"
(&p).Mp() // ERROR "undefined"
(*&p).Mp() // ERROR "undefined"
(**&p).Mp()
(*p).Mp()
(&*p).Mp()
}
{
var p P4
p.Mv() // ERROR "undefined"
(&p).Mv() // ERROR "undefined"
(*&p).Mv() // ERROR "undefined"
(**&p).Mv()
(*p).Mv()
(&*p).Mv()
p.Mp() // ERROR "undefined"
(&p).Mp() // ERROR "undefined"
(*&p).Mp() // ERROR "undefined"
(**&p).Mp()
(*p).Mp()
(&*p).Mp()
}
}
func _() {
type P5 struct{ T }
type P6 struct{ *T }
type P7 *struct{ T }
type P8 *struct{ *T }
{
var p P5
p.Mv()
(&p).Mv()
(*&p).Mv()
p.Mp()
(&p).Mp()
(*&p).Mp()
}
{
var p P6
p.Mv()
(&p).Mv()
(*&p).Mv()
p.Mp()
(&p).Mp()
(*&p).Mp()
}
{
var p P7
p.Mv() // ERROR "undefined"
(&p).Mv() // ERROR "undefined"
(*&p).Mv() // ERROR "undefined"
(**&p).Mv()
(*p).Mv()
(&*p).Mv()
p.Mp() // ERROR "undefined"
(&p).Mp() // ERROR "undefined"
(*&p).Mp() // ERROR "undefined"
(**&p).Mp()
(*p).Mp()
(&*p).Mp()
}
{
var p P8
p.Mv() // ERROR "undefined"
(&p).Mv() // ERROR "undefined"
(*&p).Mv() // ERROR "undefined"
(**&p).Mv()
(*p).Mv()
(&*p).Mv()
p.Mp() // ERROR "undefined"
(&p).Mp() // ERROR "undefined"
(*&p).Mp() // ERROR "undefined"
(**&p).Mp()
(*p).Mp()
(&*p).Mp()
}
}