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cmd/compile: detect invalid NIH conversions within unified IR

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Unified IR currently relies on typecheck to diagnose invalid
//go:notinheap conversions, which prevents removing all of
its (otherwise) dead error-reporting code.

This CL updates the unified IR reader to instead proactively diagnose
these invalid conversions. This logic can be removed again once #46731
is implemented, but in the mean time it allows progress on #51691.

Updates #46731.
Updates #51691.

Change-Id: Ifae81aaad770209ec7a67bc10b55660f291e403e
Reviewed-on: https://go-review.googlesource.com/c/go/+/392917
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit is contained in:
Matthew Dempsky 2022-03-15 22:25:36 -07:00
parent c0158b6a00
commit a1bf50eefe
1 changed files with 14 additions and 0 deletions
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14
src/cmd/compile/internal/noder/reader.go
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@ -1676,6 +1676,20 @@ func (r *reader) expr() (res ir.Node) {
typ := r.typ()
pos := r.pos()
x := r.expr()
// TODO(mdempsky): Stop constructing expressions of untyped type.
x = typecheck.DefaultLit(x, typ)
if op, why := typecheck.Convertop(x.Op() == ir.OLITERAL, x.Type(), typ); op == ir.OXXX {
// types2 ensured that x is convertable to typ under standard Go
// semantics, but cmd/compile also disallows some conversions
// involving //go:notinheap.
//
// TODO(mdempsky): This can be removed after #46731 is implemented.
base.ErrorfAt(pos, "cannot convert %L to type %v%v", x, typ, why)
base.ErrorExit() // harsh, but prevents constructing invalid IR
}
return typecheck.Expr(ir.NewConvExpr(pos, ir.OCONV, typ, x))
}
}