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cmd/compile/internal/noder: refactor exprConvert code

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This CL deduplicates the explicit and implicit exprConvert code paths
to have a single common function, so they're easier to keep in sync.

Change-Id: I2b145d2ce6de6018ffc2db5cdb9d891f4e223381
Reviewed-on: https://go-review.googlesource.com/c/go/+/427677
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Matthew Dempsky 2022-09-01 16:02:49 -07:00
parent 8bbb362f4c
commit 8af6c3348e
1 changed files with 22 additions and 19 deletions
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41
src/cmd/compile/internal/noder/writer.go
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@ -1794,14 +1794,7 @@ func (w *writer) expr(expr syntax.Expr) {
if tv.IsType() {
assert(len(expr.ArgList) == 1)
assert(!expr.HasDots)
w.Code(exprConvert)
w.Bool(false) // explicit
w.typ(tv.Type)
w.pos(expr)
w.convRTTI(w.p.typeOf(expr.ArgList[0]), tv.Type)
w.Bool(isTypeParam(tv.Type))
w.expr(expr.ArgList[0])
w.convertExpr(tv.Type, expr.ArgList[0], false)
break
}
@ -2069,19 +2062,29 @@ func (w *writer) multiExpr(pos poser, dstType func(int) types2.Type, exprs []syn
// from expr's type, then an implicit conversion operation is inserted
// at expr's position.
func (w *writer) implicitConvExpr(dst types2.Type, expr syntax.Expr) {
w.convertExpr(dst, expr, true)
}
func (w *writer) convertExpr(dst types2.Type, expr syntax.Expr, implicit bool) {
src := w.p.typeOf(expr)
if dst != nil && !types2.Identical(src, dst) {
if !types2.AssignableTo(src, dst) {
w.p.fatalf(expr.Pos(), "%v is not assignable to %v", src, dst)
}
w.Code(exprConvert)
w.Bool(true) // implicit
w.typ(dst)
w.pos(expr)
w.convRTTI(src, dst)
w.Bool(isTypeParam(dst))
// fallthrough
// Omit implicit no-op conversions.
identical := dst == nil || types2.Identical(src, dst)
if implicit && identical {
w.expr(expr)
return
}
if implicit && !types2.AssignableTo(src, dst) {
w.p.fatalf(expr, "%v is not assignable to %v", src, dst)
}
w.Code(exprConvert)
w.Bool(implicit)
w.typ(dst)
w.pos(expr)
w.convRTTI(src, dst)
w.Bool(isTypeParam(dst))
w.expr(expr)
}