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cmd/compile: internal compiler error: weird Sym #47896

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1995parham opened this issue Aug 22, 2021 · 6 comments
Closed

cmd/compile: internal compiler error: weird Sym #47896

1995parham opened this issue Aug 22, 2021 · 6 comments
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@1995parham
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@1995parham 1995parham commented Aug 22, 2021

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

$ gotip version
go version devel go1.18-6416bde Sun Aug 22 13:54:24 2021 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/parham/.cache/go-build"
GOENV="/home/parham/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/parham/Documents/Go/pkg/mod"
GONOPROXY="gitlab.snapp.ir"
GONOSUMDB="gitlab.snapp.ir"
GOOS="linux"
GOPATH="/home/parham/Documents/Go"
GOPRIVATE="gitlab.snapp.ir"
GOPROXY="https://goproxy.io,direct"
GOROOT="/home/parham/sdk/gotip"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/parham/sdk/gotip/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="devel go1.18-6416bde Sun Aug 22 13:54:24 2021 +0000"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/parham/Downloads/linkedlist.go/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-build1063418849=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I have written the following generic code which is related to a linked list.

package list

import "github.com/1995parham/linkedlist/pkg/node"

type List[T any] struct {
        Head *node.Node[T]
}

func New[T any]() *List[T] {
        return &List[T]{
                Head: nil,
        }
}

func (l *List[T]) PushFront(data T) {
        nn := node.New(data)
        if l.Head == nil {
                l.Head = nn
        } else {
                nn.Next = l.Head
                l.Head = nn
        }
}

and the following code as a test.

package list

import "testing"

func TestListWith3Member(t *testing.T) {
        l := New[int]()

        l.PushFront(10)
}

What did you expect to see?

I expect the code passes the tests without issues.

What did you see instead?

# github.com/1995parham/linkedlist/pkg/list [github.com/1995parham/linkedlist/pkg/list.test]
<autogenerated>:1: internal compiler error: weird Sym: .dict.(*List[int]).PushFront, .dict.(*List[int]).PushFront

goroutine 1 [running]:
runtime/debug.Stack()
        /home/parham/sdk/gotip/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0x6de4d8, 0xc0}, {0xcf6719, 0x11}, {0xc0000ef8a8, 0x2, 0x2})
        /home/parham/sdk/gotip/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
        /home/parham/sdk/gotip/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/typecheck.(*iexporter).pushDecl(0xc0006de4d0, 0xc000109a00)
        /home/parham/sdk/gotip/src/cmd/compile/internal/typecheck/iexport.go:429 +0xb8
cmd/compile/internal/typecheck.WriteExports({0xe48b00, 0xc000728840}, 0x1)
        /home/parham/sdk/gotip/src/cmd/compile/internal/typecheck/iexport.go:294 +0x2b0
cmd/compile/internal/noder.WriteExports(0xc0006d29e0)
        /home/parham/sdk/gotip/src/cmd/compile/internal/noder/export.go:40 +0x7a
cmd/compile/internal/gc.dumpCompilerObj(0xc0006d29e0)
        /home/parham/sdk/gotip/src/cmd/compile/internal/gc/obj.go:107 +0x28
cmd/compile/internal/gc.dumpobj1({0x7ffc572ff78a, 0x23}, 0x3)
        /home/parham/sdk/gotip/src/cmd/compile/internal/gc/obj.go:63 +0x185
cmd/compile/internal/gc.dumpobj()
        /home/parham/sdk/gotip/src/cmd/compile/internal/gc/obj.go:44 +0x36
cmd/compile/internal/gc.Main(0xd1bee0)
        /home/parham/sdk/gotip/src/cmd/compile/internal/gc/main.go:322 +0x10d6
main.main()
        /home/parham/sdk/gotip/src/cmd/compile/main.go:55 +0xdd

FAIL    github.com/1995parham/linkedlist/pkg/list [build failed]
@seankhliao
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@seankhliao seankhliao commented Aug 22, 2021

what is in github.com/1995parham/linkedlist/pkg/node

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@1995parham
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@1995parham 1995parham commented Aug 22, 2021

I share it here.

package node

type Node[T any] struct {
	Data T
	Next *Node[T]
}


func New[T any](data T) *Node[T] {
	return &Node[T]{
		Data: data,
		Next: nil,
	}
}

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@renthraysk
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@renthraysk renthraysk commented Aug 22, 2021

Another instance of the error.
go version devel go1.18-8fff20ffeb Sat Aug 21 11:23:14 2021 +0000 linux/amd64

https://go2goplay.golang.org/p/BpN_3KWb98g

autogenerated>:1: internal compiler error: weird Sym: .dict.(*Repository[main.Actor]).query, .dict.(*Repository[main.Actor]).query

goroutine 1 [running]:
runtime/debug.Stack()
	/home/ren/sdk/gotip/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0x767138, 0xc0}, {0xcf6719, 0x11}, {0xc0008078a8, 0x2, 0x2})
	/home/ren/sdk/gotip/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
	/home/ren/sdk/gotip/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/typecheck.(*iexporter).pushDecl(0xc000767130, 0xc0005b9a00)
	/home/ren/sdk/gotip/src/cmd/compile/internal/typecheck/iexport.go:429 +0xb8
cmd/compile/internal/typecheck.WriteExports({0xe48ac0, 0xc000598540}, 0x1)
	/home/ren/sdk/gotip/src/cmd/compile/internal/typecheck/iexport.go:294 +0x2b0
cmd/compile/internal/noder.WriteExports(0xc00075d280)
	/home/ren/sdk/gotip/src/cmd/compile/internal/noder/export.go:40 +0x7a
cmd/compile/internal/gc.dumpCompilerObj(0xc00075d280)
	/home/ren/sdk/gotip/src/cmd/compile/internal/gc/obj.go:107 +0x28
cmd/compile/internal/gc.dumpobj1({0x7ffec203601a, 0x24}, 0x3)
	/home/ren/sdk/gotip/src/cmd/compile/internal/gc/obj.go:63 +0x185
cmd/compile/internal/gc.dumpobj()
	/home/ren/sdk/gotip/src/cmd/compile/internal/gc/obj.go:44 +0x36
cmd/compile/internal/gc.Main(0xd1bee0)
	/home/ren/sdk/gotip/src/cmd/compile/internal/gc/main.go:322 +0x10d6
main.main()
	/home/ren/sdk/gotip/src/cmd/compile/main.go:55 +0xdd

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@seankhliao seankhliao changed the title Compiler Error on Generic Method cmd/compile: internal compiler error: weird Sym Aug 23, 2021
@komuw
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@komuw komuw commented Aug 23, 2021

running gotip with export GOEXPERIMENT=unified seems to fix this

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@1995parham
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@1995parham 1995parham commented Aug 23, 2021

Yes, it causes the success compile. can you please share any document about the unified feature?

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@danscales danscales self-assigned this Aug 23, 2021
@gopherbot
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@gopherbot gopherbot commented Aug 23, 2021

Change https://golang.org/cl/344609 mentions this issue: cmd/compile: reuse same node for global dictionaries

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@gopherbot gopherbot closed this in 8eeb1bf Aug 24, 2021
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