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cmd/compile: fix typechecking logical operators panic with non-boolean operand

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In CL 255899, we added code to make clearer error when non-bool used
as operand to logical operators. The code is safe, because node type
is guaranteed to be non-nil.

In CL 279442, we refactored typechecking arith, including moving
typechecking logical operators to separate case. Now we have to
explicitly check if operand type is not nil, because calling Expr can
set operand type nil for non-bool operands.

Fixes #45804

Change-Id: Ie2b6e18f65c0614a803b343f60e78ee1d660bbeb
Reviewed-on: https://go-review.googlesource.com/c/go/+/314209
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Cuong Manh Le 2021-04-27 23:01:16 +07:00
parent 983dea90c1
commit c9f43507c6
2 changed files with 23 additions and 0 deletions
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4
src/cmd/compile/internal/typecheck/typecheck.go
View File

@ -596,6 +596,10 @@ func typecheck1(n ir.Node, top int) ir.Node {
case ir.OANDAND, ir.OOROR:
n := n.(*ir.LogicalExpr)
n.X, n.Y = Expr(n.X), Expr(n.Y)
if n.X.Type() == nil || n.Y.Type() == nil {
n.SetType(nil)
return n
}
// For "x == x && len(s)", it's better to report that "len(s)" (type int)
// can't be used with "&&" than to report that "x == x" (type untyped bool)
// can't be converted to int (see issue #41500).

19
test/fixedbugs/issue45804.go Normal file
View File

@ -0,0 +1,19 @@
// errorcheck
// 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 p
func g() int
func h(int)
var b bool
func f() {
did := g()
if !did && b { // ERROR "invalid operation"
h(x) // ERROR "undefined"
}
}