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cmd/compile: improve error message if init is directly invoked

Fixes #8481.

Inform the user that init functions cannot be directly invoked
in user code, as mandated by the spec at:
http://golang.org/ref/spec#Program_initialization_and_execution.

Change-Id: Ib12c0c08718ffd48b76b6f9b13c76bb6612d2e7b
Reviewed-on: https://go-review.googlesource.com/34790
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Emmanuel Odeke 2017-01-01 03:08:48 -07:00 committed by Matthew Dempsky
parent dbd51ce99c
commit cb6e0639fb
3 changed files with 28 additions and 6 deletions

View File

@ -3648,11 +3648,19 @@ func typecheckdef(n *Node) *Node {
lineno = n.Pos
}
// Note: adderrorname looks for this string and
// adds context about the outer expression
yyerror("undefined: %v", n.Sym)
switch n.Sym.Name {
case "init":
// As per the spec at:
// https://golang.org/ref/spec#Program_initialization_and_execution
// init cannot be referred to in usercode.
// See https://golang.org/issues/8481.
yyerror("cannot refer to init functions")
default:
// Note: adderrorname looks for this string and
// adds context about the outer expression
yyerror("undefined: %v", n.Sym)
}
}
return n
}

View File

@ -0,0 +1,14 @@
// errorcheck
// Copyright 2016 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 main
func init() {
}
func main() {
init() // ERROR "cannot refer to init functions"
}

View File

@ -15,7 +15,7 @@ func init() {
}
func main() {
init() // ERROR "undefined.*init"
init() // ERROR "cannot refer to init functions"
runtime.init() // ERROR "unexported.*runtime\.init"
var _ = init // ERROR "undefined.*init"
var _ = init // ERROR "cannot refer to init functions"
}