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// Copyright 2021 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 noder
import (
"fmt"
"cmd/compile/internal/ir"
"cmd/compile/internal/syntax"
)
func unpackListExpr(expr syntax.Expr) []syntax.Expr {
switch expr := expr.(type) {
case nil:
return nil
case *syntax.ListExpr:
return expr.ElemList
default:
return []syntax.Expr{expr}
}
}
// constExprOp returns an ir.Op that represents the outermost
// operation of the given constant expression. It's intended for use
// with ir.RawOrigExpr.
func constExprOp(expr syntax.Expr) ir.Op {
switch expr := expr.(type) {
default:
panic(fmt.Sprintf("%s: unexpected expression: %T", expr.Pos(), expr))
case *syntax.BasicLit:
return ir.OLITERAL
case *syntax.Name, *syntax.SelectorExpr:
return ir.ONAME
case *syntax.CallExpr:
return ir.OCALL
case *syntax.Operation:
if expr.Y == nil {
return unOps[expr.Op]
}
return binOps[expr.Op]
}
}
func unparen(expr syntax.Expr) syntax.Expr {
for {
paren, ok := expr.(*syntax.ParenExpr)
if !ok {
return expr
}
expr = paren.X
}
}
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