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cmd/compile: allow aliases to go:notinheap types

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The alias doesn't need to be marked go:notinheap. It gets its
notinheap-ness from the target type.

Without this change, the type alias test in the notinheap.go file
generates these two errors:

notinheap.go:62: misplaced compiler directive
notinheap.go:63: type nih must be go:notinheap

The first is a result of go:notinheap pragmas not applying
to type alias declarations.
The second is the result of then trying to match the notinheap-ness
of the alias and the target type.

Add a few more go:notinheap tests while we are here.

Update #40954

Change-Id: I067ec47698df6e9e593e080d67796fd05a1d480f
Reviewed-on: https://go-review.googlesource.com/c/go/+/250939
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Keith Randall <khr@golang.org>
This commit is contained in:
Keith Randall 2020-08-26 14:07:35 -07:00
parent 16328513bf
commit 4f915911e8
3 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/compile/internal/gc/typecheck.go
View File

@ -2068,7 +2068,7 @@ func typecheck1(n *Node, top int) (res *Node) {
ok |= ctxStmt
n.Left = typecheck(n.Left, ctxType)
checkwidth(n.Left.Type)
if n.Left.Type != nil && n.Left.Type.NotInHeap() && n.Left.Name.Param.Pragma&NotInHeap == 0 {
if n.Left.Type != nil && n.Left.Type.NotInHeap() && !n.Left.Name.Param.Alias && n.Left.Name.Param.Pragma&NotInHeap == 0 {
// The type contains go:notinheap types, so it
// must be marked as such (alternatively, we
// could silently propagate go:notinheap).

8
test/notinheap.go
View File

@ -52,6 +52,14 @@ type t3 byte
//go:notinheap
type t4 rune
// Type aliases inherit the go:notinheap-ness of the type they alias.
type nihAlias = nih
type embedAlias1 struct { // ERROR "must be go:notinheap"
x nihAlias
}
type embedAlias2 [1]nihAlias // ERROR "must be go:notinheap"
var sink interface{}
func i() {

10
test/notinheap2.go
View File

@ -27,14 +27,18 @@ func f() {
// Heap allocation is not okay.
var y *nih
var y2 *struct{ x nih }
var y3 *[1]nih
var z []nih
var w []nih
var n int
func g() {
y = new(nih) // ERROR "heap allocation disallowed"
z = make([]nih, 1) // ERROR "heap allocation disallowed"
z = append(z, x) // ERROR "heap allocation disallowed"
y = new(nih) // ERROR "heap allocation disallowed"
y2 = new(struct{ x nih }) // ERROR "heap allocation disallowed"
y3 = new([1]nih) // ERROR "heap allocation disallowed"
z = make([]nih, 1) // ERROR "heap allocation disallowed"
z = append(z, x) // ERROR "heap allocation disallowed"
// Test for special case of OMAKESLICECOPY
x := make([]nih, n) // ERROR "heap allocation disallowed"
copy(x, z)