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cmd/compile: internal compiler error: Int64Val(10000000000000000000) (dev.regabi branch) #43480

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zikaeroh opened this issue Jan 3, 2021 · 4 comments
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@zikaeroh
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@zikaeroh zikaeroh commented Jan 3, 2021

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

$ go version
go version devel +8fc44cf0fa Sun Jan 3 19:48:20 2021 +0000 linux/amd64

Does this issue reproduce with the latest release?

No, only on the regabi branch.

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/jake/.cache/go-build"
GOENV="/home/jake/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/jake/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/jake/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/jake/zikaeroh/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/jake/zikaeroh/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/jake/decimal/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build867052434=/tmp/go-build -gno-record-gcc-switches"
GOROOT/bin/go version: go version devel +8fc44cf0fa Sun Jan 3 19:48:20 2021 +0000 linux/amd64
GOROOT/bin/go tool compile -V: compile version devel +8fc44cf0fa Sun Jan 3 19:48:20 2021 +0000
uname -sr: Linux 5.10.4-zen2-1-zen
/usr/lib/libc.so.6: GNU C Library (GNU libc) release release version 2.32.
gdb --version: GNU gdb (GDB) 10.1

What did you do?

Cloned https://github.com/ericlagergren/decimal, built the dev.regabi branch, and did a go build in the decimal checkout.

What did you expect to see?

No errors.

What did you see instead?

# github.com/ericlagergren/decimal/internal/arith
internal/arith/pow.go:65:17: internal compiler error: Int64Val(10000000000000000000)

goroutine 1 [running]:
runtime/debug.Stack(0xe8d1a0, 0xc00000e018, 0x0)
	/home/jake/zikaeroh/go/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/base.FatalfAt(0x4902000000080, 0xd5a11d, 0xc, 0xc0001055e8, 0x1, 0x1)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/base/print.go:227 +0x1b9
cmd/compile/internal/base.Fatalf(...)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/ir.Int64Val(0xe9bb50, 0xc000069c20, 0xde0b6b3a7640000)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/ir/val.go:137 +0x105
cmd/compile/internal/walk.(*exprSwitch).flush(0xc0004db540)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/switch.go:207 +0x4fa
cmd/compile/internal/walk.(*exprSwitch).Emit(0xc0004db540, 0xc0005d5ae0)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/switch.go:139 +0x2f
cmd/compile/internal/walk.walkSwitchExpr(0xc0005d5a80)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/switch.go:106 +0x910
cmd/compile/internal/walk.walkSwitch(0xc0005d5a80)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/switch.go:29 +0x46
cmd/compile/internal/walk.walkStmt(0xe9d8d8, 0xc0005d5a80, 0xe9c210, 0xc0005f4d90)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/stmt.go:157 +0xc7a
cmd/compile/internal/walk.walkStmtList(0xc000081000, 0x31, 0x40)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/stmt.go:172 +0x65
cmd/compile/internal/walk.Walk(0xc0004f4b40)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/walk/walk.go:44 +0xb3
cmd/compile/internal/gc.compile(0xc0004f4b40)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/gc/compile.go:65 +0x54
cmd/compile/internal/gc.funccompile(0xc0004f4b40)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/gc/compile.go:53 +0xc7
cmd/compile/internal/gc.Main(0xd7ed10)
	/home/jake/zikaeroh/go/src/cmd/compile/internal/gc/main.go:323 +0x115a
main.main()
	/home/jake/zikaeroh/go/src/cmd/compile/main.go:54 +0xb1

/cc @mdempsky

@mdempsky mdempsky self-assigned this Jan 3, 2021
@zikaeroh
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@zikaeroh zikaeroh commented Jan 3, 2021

Bisects to CL 272654 (unsurprising, I guess).

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@gopherbot
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@gopherbot gopherbot commented Jan 3, 2021

Change https://golang.org/cl/281272 mentions this issue: [dev.regabi] cmd/compile: fix ICE due to large uint64 constants

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@gopherbot

This comment was marked as off-topic.

gopherbot pushed a commit that referenced this issue Jan 4, 2021
It's an error to call Int64Val on constants that don't fit into
int64. CL 272654 made the compiler stricter about detecting misuse,
and revealed that we were using it improperly in detecting consecutive
integer-switch cases. That particular usage actually did work in
practice, but it's easy and best to just fix it.

Fixes #43480.

Change-Id: I56f722d75e83091638ac43b80e45df0b0ad7d48d
Reviewed-on: https://go-review.googlesource.com/c/go/+/281272
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
@zikaeroh
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@zikaeroh zikaeroh commented Jan 4, 2021

Closing as fixed on dev.regabi (GitHub won't autoclose this until it's merged into master).

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3 participants