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c0bbeb0982
With this change, the shift checking code matches the corresponding go/types code, but for the differences in the internal error reporting, and call of check.overflow. The change leads to the recording of an untyped int value if the RHS of a non-constant shift is an untyped integer value. Adjust the type in the compiler's irgen accordingly. Add test/shift3.go to verify behavior. Change-Id: I20386fcb1d5c48becffdc2203081fb70c08b282d Reviewed-on: https://go-review.googlesource.com/c/go/+/398236 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
42 lines
834 B
Go
42 lines
834 B
Go
// run
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// Copyright 2022 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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// Test that the compiler's noder uses the correct type
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// for RHS shift operands that are untyped. Must compile;
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// run for good measure.
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package main
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import (
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"fmt"
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"math"
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)
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func f(x, y int) {
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if x != y {
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panic(fmt.Sprintf("%d != %d", x, y))
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}
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}
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func main() {
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var x int = 1
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f(x<<1, 2)
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f(x<<1., 2)
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f(x<<(1+0i), 2)
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f(x<<0i, 1)
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f(x<<(1<<x), 4)
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f(x<<(1.<<x), 4)
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f(x<<((1+0i)<<x), 4)
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f(x<<(0i<<x), 1)
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// corner cases
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const M = math.MaxUint
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f(x<<(M+0), 0) // shift by untyped int representable as uint
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f(x<<(M+0.), 0) // shift by untyped float representable as uint
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f(x<<(M+0.+0i), 0) // shift by untyped complex representable as uint
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}
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