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dca707b2a0
CL 154057 adds guards agaist out-of-bound reads from readonly constants. It turns out that in dead code, the offset can also be negative. Guard against negative offset as well. Fixes #30257. Change-Id: I47c2a2e434dd466c08ae6f50f213999a358c796e Reviewed-on: https://go-review.googlesource.com/c/162819 Reviewed-by: Keith Randall <khr@golang.org>
36 lines
596 B
Go
36 lines
596 B
Go
// compile
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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func f() {
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var s string
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var p, q bool
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s = "a"
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for p {
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p = false == (true != q)
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s = ""
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}
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_ = s == "bbb"
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}
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// Another case: load from negative offset of a symbol
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// in dead code (issue 30257).
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func g() {
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var i int
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var s string
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if true {
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s = "a"
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}
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if f := 0.0; -f < 0 {
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i = len(s[:4])
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}
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_ = s[i-1:0] != "bb" && true
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}
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