mirror of
https://github.com/golang/go
synced 2024-09-04 23:44:16 +00:00
cmd/compile: correctly import labels, gotos, and fallthroughs
The importer had several bugs with respect to labels and gotos: - it didn't create a new ONAME node for label names (label dcl, goto, continue, and break) - it overwrote the symbol for gotos with the dclstack - it didn't set the dclstack for labels In the process changed export format slightly to always assume a label name for labels and gotos, and never assume a label for fallthroughs. For fallthroughs and switch cases, now also set Xoffset like in the parser. (Not setting it, i.e., using 0 was ok since this is only used for verifying correct use of fallthroughs, which was checked already. But it's an extra level of verification of the import.) Fixes #15838. Change-Id: I3637f6314b8651c918df0c8cd70cd858c92bd483 Reviewed-on: https://go-review.googlesource.com/23445 Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
parent
b9ec0024fb
commit
30282b091d
|
@ -1488,19 +1488,18 @@ func (p *exporter) stmt(n *Node) {
|
|||
p.stmtList(n.List)
|
||||
p.stmtList(n.Nbody)
|
||||
|
||||
case OFALL:
|
||||
op = OXFALL
|
||||
fallthrough
|
||||
case OFALL, OXFALL:
|
||||
p.op(OXFALL)
|
||||
|
||||
case OBREAK, OCONTINUE, OGOTO, OXFALL:
|
||||
case OBREAK, OCONTINUE:
|
||||
p.op(op)
|
||||
p.exprsOrNil(n.Left, nil)
|
||||
|
||||
case OEMPTY:
|
||||
// nothing to emit
|
||||
|
||||
case OLABEL:
|
||||
p.op(OLABEL)
|
||||
case OGOTO, OLABEL:
|
||||
p.op(op)
|
||||
p.expr(n.Left)
|
||||
|
||||
default:
|
||||
|
|
|
@ -1038,6 +1038,7 @@ func (p *importer) node() *Node {
|
|||
case OXCASE:
|
||||
markdcl()
|
||||
n := Nod(OXCASE, nil, nil)
|
||||
n.Xoffset = int64(block)
|
||||
n.List.Set(p.exprList())
|
||||
// TODO(gri) eventually we must declare variables for type switch
|
||||
// statements (type switch statements are not yet exported)
|
||||
|
@ -1048,16 +1049,24 @@ func (p *importer) node() *Node {
|
|||
// case OFALL:
|
||||
// unreachable - mapped to OXFALL case below by exporter
|
||||
|
||||
case OBREAK, OCONTINUE, OGOTO, OXFALL:
|
||||
case OXFALL:
|
||||
n := Nod(OXFALL, nil, nil)
|
||||
n.Xoffset = int64(block)
|
||||
return n
|
||||
|
||||
case OBREAK, OCONTINUE:
|
||||
left, _ := p.exprsOrNil()
|
||||
if left != nil {
|
||||
left = newname(left.Sym)
|
||||
}
|
||||
return Nod(op, left, nil)
|
||||
|
||||
// case OEMPTY:
|
||||
// unreachable - not emitted by exporter
|
||||
|
||||
case OLABEL:
|
||||
n := Nod(OLABEL, p.expr(), nil)
|
||||
n.Left.Sym = dclstack // context, for goto restrictions
|
||||
case OGOTO, OLABEL:
|
||||
n := Nod(op, newname(p.expr().Sym), nil)
|
||||
n.Sym = dclstack // context, for goto restrictions
|
||||
return n
|
||||
|
||||
case OEND:
|
||||
|
|
61
test/fixedbugs/issue15838.dir/a.go
Normal file
61
test/fixedbugs/issue15838.dir/a.go
Normal file
|
@ -0,0 +1,61 @@
|
|||
// 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 a
|
||||
|
||||
func F1() {
|
||||
L:
|
||||
goto L
|
||||
}
|
||||
|
||||
func F2() {
|
||||
L:
|
||||
for {
|
||||
break L
|
||||
}
|
||||
}
|
||||
|
||||
func F3() {
|
||||
L:
|
||||
for {
|
||||
continue L
|
||||
}
|
||||
}
|
||||
|
||||
func F4() {
|
||||
switch {
|
||||
case true:
|
||||
fallthrough
|
||||
default:
|
||||
}
|
||||
}
|
||||
|
||||
type T struct{}
|
||||
|
||||
func (T) M1() {
|
||||
L:
|
||||
goto L
|
||||
}
|
||||
|
||||
func (T) M2() {
|
||||
L:
|
||||
for {
|
||||
break L
|
||||
}
|
||||
}
|
||||
|
||||
func (T) M3() {
|
||||
L:
|
||||
for {
|
||||
continue L
|
||||
}
|
||||
}
|
||||
|
||||
func (T) M4() {
|
||||
switch {
|
||||
case true:
|
||||
fallthrough
|
||||
default:
|
||||
}
|
||||
}
|
9
test/fixedbugs/issue15838.dir/b.go
Normal file
9
test/fixedbugs/issue15838.dir/b.go
Normal file
|
@ -0,0 +1,9 @@
|
|||
// 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 b
|
||||
|
||||
import "./a"
|
||||
|
||||
type T struct{ a.T }
|
12
test/fixedbugs/issue15838.go
Normal file
12
test/fixedbugs/issue15838.go
Normal file
|
@ -0,0 +1,12 @@
|
|||
// compiledir
|
||||
|
||||
// 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.
|
||||
|
||||
// Test cases for issue #15838, and related failures.
|
||||
// Make sure the importer correctly sets up nodes for
|
||||
// label decls, goto, continue, break, and fallthrough
|
||||
// statements.
|
||||
|
||||
package ignored
|
Loading…
Reference in a new issue