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cmd/compile: FwdRef panic error while generating ssa view #51108

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changkun opened this issue Feb 9, 2022 · 1 comment
Closed

cmd/compile: FwdRef panic error while generating ssa view #51108

changkun opened this issue Feb 9, 2022 · 1 comment
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.19

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@changkun
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changkun commented Feb 9, 2022

What version of Go are you using (go version)?

$ go version
go version go1.18beta2 linux/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

// x.go
package foo

func testfn() {

	var b1 string
	var b2 []byte

	_ = string(b1) == string(b2)
	_ = string(b1) < string(b2)
}

GOSSAFUNC=testfn go tool compile x.go

Open "before insert phis"

Check

v30 (9) = FwdRef <mem> {{[] %!v(PANIC=Format method: runtime error: invalid memory address or nil pointer dereference)}}

Reported by @mark-pictor-csec, see also golang-design/ssaplayground#15

What did you expect to see?

No panic

What did you see instead?

Panic
@changkun changkun mentioned this issue Feb 9, 2022
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@gopherbot
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Change https://go.dev/cl/384614 mentions this issue: cmd/compile:

@cherrymui cherrymui added the NeedsFix The path to resolution is known, but the work has not been done. label Feb 11, 2022
@cherrymui cherrymui added this to the Unplanned milestone Feb 11, 2022
@dmitshur dmitshur modified the milestones: Unplanned, Go1.19 Mar 4, 2022
@golang golang locked and limited conversation to collaborators Mar 4, 2023
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.19
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