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go/types: failure to report errors on test/fixedbugs/issue20232.go #42695

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mdempsky opened this issue Nov 18, 2020 · 4 comments
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go/types: failure to report errors on test/fixedbugs/issue20232.go #42695

mdempsky opened this issue Nov 18, 2020 · 4 comments
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@mdempsky
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mdempsky commented Nov 18, 2020 •
edited

While integrating go/constant into cmd/compile, I discovered that go/types isn't actually handling the test case from #20232 correctly. In particular, this variation on the test case demonstrates two latent issues:

package p

const _ uint8 = 6e5518446744
const _ = 0 * 1e+1000000000
  1. go/types fails to report any error about 6e5518446744; it should report that it's too large of a constant, or that it overflows uint8.
  2. go/types crashes on the second case, due to multiplying 0 by infinity; again, it should instead gracefully report a constant-too-large error instead.

/cc @griesemer
@findleyr findleyr self-assigned this Nov 18, 2020
@griesemer
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There's at the very least a missing test in operand.setConst:

if x.val.Kind() == constant.Unknown {
        x.mode = invalid
}

@griesemer griesemer added this to the Go1.16 milestone Nov 18, 2020
@griesemer
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The 2nd example is already reported as #20583.

@gopherbot
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Change https://golang.org/cl/271377 mentions this issue: go/types: report an error for invalid constant values

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Change https://golang.org/cl/271520 mentions this issue: [dev.typeparams] cmd/compile/internal/types2: report an error for invalid constant values

gopherbot pushed a commit that referenced this issue Nov 19, 2020
@griesemer
[dev.typeparams] cmd/compile/internal/types2: report an error for inv…
0123c9b 
…alid constant values

This is https://golang.org/cl/271377 ported to types2.

Updates #42695.

Change-Id: I475bdcaeace5b0e87d4476a6d660996534289666
Reviewed-on: https://go-review.googlesource.com/c/go/+/271520
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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