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171850f169
In the Sizes API, recognize an overflow (to a negative value) as a consequence of an oversize value, and specify as such in the API. Adjust the various size computations to take overflow into account. Recognize a negative size or offset as an error and report it rather than panicking. Use the same protocol for results provided by the default (StdSizes) and external Sizes implementations. Add a new error code TypeTooLarge for the new errors. Fixes #59190. Fixes #59207. Change-Id: I8c33a9e69932760275100112dde627289ac7695b Reviewed-on: https://go-review.googlesource.com/c/go/+/478919 Run-TryBot: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Robert Griesemer <gri@google.com>
40 lines
688 B
Go
40 lines
688 B
Go
// errorcheck
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// Copyright 2023 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 p
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import "unsafe"
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type E [1 << 30]complex128
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var a [1 << 30]E
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var _ = unsafe.Sizeof(a) // ERROR "too large"
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var s struct {
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_ [1 << 30]E
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x int
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}
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var _ = unsafe.Offsetof(s.x) // ERROR "too large"
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// Test case from issue (modified so it also triggers on 32-bit platforms).
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type A [1]int
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type S struct {
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x A
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y [1 << 30]A
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z [1 << 30]struct{}
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}
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type T [1 << 30][1 << 30]S
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func _() {
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var a A
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var s S
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var t T
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_ = unsafe.Sizeof(a)
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_ = unsafe.Sizeof(s)
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_ = unsafe.Sizeof(t) // ERROR "too large"
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}
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