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go/test/fixedbugs/issue33438.go
Keith Randall 316ac4f330 cmd/compile: fix crash on write barrier insertion
The compiler can crash if the compiled code tries to
unconditionally read from a nil pointer. This should cause
the generated binary to panic, not the compiler.

Fixes #33438

Change-Id: Ic8fa89646d6968e2cc4e27da0ad9286662f8bc49
Reviewed-on: https://go-review.googlesource.com/c/go/+/188760
Reviewed-by: Austin Clements <austin@google.com>
2019-08-02 19:35:37 +00:00

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544 B
Go

// compile
// Copyright 2019 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
type hasPtrs struct {
x [2]*int
// Note: array size needs to be >1 to force this type to be not SSAable.
// The bug triggers only for OpMove, which is only used for unSSAable types.
}
func main() {
var x *hasPtrs // Can be local, global, or arg; nil or non-nil.
var y *hasPtrs = nil // Must initialize to nil.
*x = *y
}