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[dev.typeparams] cmd/compile: fix some issues with cons.go

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Add a test to make sure there's no invalid OCONVIFACEs when stenciling is done.

Use concrete types for the type of DOTTYPE and DOTTYPE2.

MarkTypeUsedInInterface - should we allow types with shape types
underneath? I think the itab CL will help with this (at least, for
a remaining cons.go issue).

Change-Id: I2c96d74e8daaca26cadc84ea94abb9a27c0bb240
Reviewed-on: https://go-review.googlesource.com/c/go/+/337069
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Keith Randall 2021-07-23 15:23:57 -07:00
parent e6d956e1c5
commit 6992dcdad9
2 changed files with 29 additions and 1 deletions
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24
src/cmd/compile/internal/noder/stencil.go
View File

@ -994,6 +994,26 @@ func (g *irgen) genericSubst(newsym *types.Sym, nameNode *ir.Name, shapes, targs
g.instTypeList = append(g.instTypeList, subst.unshapify.InstTypeList...)
g.instTypeList = append(g.instTypeList, subst.concretify.InstTypeList...)
if doubleCheck {
okConvs := map[ir.Node]bool{}
ir.Visit(newf, func(n ir.Node) {
if n.Op() == ir.OIDATA {
// IDATA(OCONVIFACE(x)) is ok, as we don't use the type of x.
// TODO: use some other op besides OCONVIFACE. ONEW might work
// (with appropriate direct vs. indirect interface cases).
okConvs[n.(*ir.UnaryExpr).X] = true
}
if n.Op() == ir.OCONVIFACE && !okConvs[n] {
c := n.(*ir.ConvExpr)
if c.X.Type().HasShape() {
ir.Dump("BAD FUNCTION", newf)
ir.Dump("BAD CONVERSION", c)
base.Fatalf("converting shape type to interface")
}
}
})
}
return newf
}
@ -1367,6 +1387,8 @@ func (subst *subster) node(n ir.Node) ir.Node {
if x.X.Type().HasTParam() {
m = subst.convertUsingDictionary(m.Pos(), m.(*ir.ConvExpr).X, x, m.Type(), x.X.Type())
}
case ir.ODOTTYPE, ir.ODOTTYPE2:
m.SetType(subst.unshapifyTyp(m.Type()))
case ir.ONEW:
// New needs to pass a concrete type to the runtime.
@ -1535,7 +1557,7 @@ func (g *irgen) getDictionarySym(gf *ir.Name, targs []*types.Type, isMeth bool)
// Enforce that only concrete types can make it to here.
for _, t := range targs {
if t.IsShape() {
if t.HasShape() {
panic(fmt.Sprintf("shape %+v in dictionary for %s", t, gf.Sym().Name))
}
}

6
src/cmd/compile/internal/reflectdata/reflect.go
View File

@ -1982,6 +1982,12 @@ var ZeroSize int64
// MarkTypeUsedInInterface marks that type t is converted to an interface.
// This information is used in the linker in dead method elimination.
func MarkTypeUsedInInterface(t *types.Type, from *obj.LSym) {
if t.HasShape() {
// TODO: shape types shouldn't be put in interfaces, so we shouldn't ever get here.
// We don't from ../noder/stencil.go, but we do from ../walk/walk.go when we let
// shape types become the types of interfaces.
//base.Fatalf("shape types have no methods %+v", t)
}
tsym := TypeLinksym(t)
// Emit a marker relocation. The linker will know the type is converted
// to an interface if "from" is reachable.