cmd/compile: internal compiler error: 'XXXXXX': not lowered: v128, Load INTER PTR SSA

[duzy]

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

$ go version
go version devel +6c64b6db68 Thu Dec 10 03:18:00 2020 +0000 darwin/amd64

Does this issue reproduce with the latest release?

The release-branch.go1.15 is fine (go version go1.15.6 darwin/amd64).

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/duzy/Library/Caches/go-build"
GOENV="/Users/duzy/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/duzy/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/duzy/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="devel +6c64b6db68 Thu Dec 10 03:18:00 2020 +0000"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/6l/hhs6f1cj07j82qy6hdph9cs40000gn/T/go-build3508354968=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Just recompile my code with the new 'go'.

What did you expect to see?

You say it.

What did you see instead?

../go/src/extbit.io/smart/object.go:221:34: internal compiler error: '(*ScopeName).Get': not lowered: v128, Load INTER PTR SSA

goroutine 97 [running]:
runtime/debug.Stack(0x19b8180, 0xc00000e018, 0x0)
	/usr/local/go/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0xc004e65e30, 0x8, 0xc00065ed80, 0x2, 0x2)
	/usr/local/go/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.(*ssafn).Fatalf(0xc0070336e0, 0x7328000000950, 0x1892173, 0x2, 0xc001ca4c90, 0x1, 0x1)
	/usr/local/go/src/cmd/compile/internal/gc/ssa.go:7164 +0x1a5
cmd/compile/internal/ssa.(*Func).Fatalf(...)
	/usr/local/go/src/cmd/compile/internal/ssa/func.go:652
cmd/compile/internal/ssa.checkLower(0xc003d658c0)
	/usr/local/go/src/cmd/compile/internal/ssa/lower.go:36 +0x41a
cmd/compile/internal/ssa.Compile(0xc003d658c0)
	/usr/local/go/src/cmd/compile/internal/ssa/compile.go:96 +0x98d
cmd/compile/internal/gc.buildssa(0xc0004b54a0, 0x2, 0x0)
	/usr/local/go/src/cmd/compile/internal/gc/ssa.go:470 +0x11ba
cmd/compile/internal/gc.compileSSA(0xc0004b54a0, 0x2)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:319 +0x5d
cmd/compile/internal/gc.compileFunctions.func2(0xc002c554a0, 0xc004d8b1b0, 0x2)
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:384 +0x4d
created by cmd/compile/internal/gc.compileFunctions
	/usr/local/go/src/cmd/compile/internal/gc/pgen.go:382 +0x129

where the ScopeName.Get is looking like this:

func (n *ScopeName) Get(name string) (Value, error) {
  ...
}

[cuonglm]

Seems related to expand calls again. Could you please give a minimal reproducible example, or make the code public somewhere?

[duzy]

@cuonglm Please try go build the https://github.com/duzy/smart (not the same as my private work copy, but should reproduce it).

[mengzhuo]

I'm trying to reproduce by the code below but it compiled, please provide mininal code example.

package main

import (
        "fmt"
        got "go/token"
        "sync"
)

type Position struct {
        got.Position
}

type Scope struct {
        mutex    *sync.Mutex
        position Position
        outer    *Scope
        comment  string
}

type trivial struct{ position Position }

type trivialobject struct { // generally unnamed objects
        trivial
        scope *Scope
}

type knownobject struct { // generally named objects
        trivialobject
        name string
}

type ScopeName struct {
        knownobject
        scope *Scope
}

func (n *ScopeName) Get() string {
        return n.name
}

func main() {
        a := &ScopeName{}
        fmt.Println(a.Get())
}

[duzy]

@mengzhuo Hi, I will suggest you to compile https://github.com/duzy/smart/blob/master/cmd/main.go instead of your code segment. Because your extracted ScopeName is very different from in https://github.com/duzy/smart.

[duzy]

A quick try might be go get github.com/duzy/smart/cmd. Or just clone it, and do cd smart/cmd && go build, should be very quick.

[gopherbot]

Change https://golang.org/cl/276952 mentions this issue: cmd/compile: set correct type for OpIData

[ALTree]

Tentatively labelling this as a 1.16 Release Blocker, since it's a compiler crash on a first class port, and introduced in this development cycle; just to be sure this is at least looked at before the release. Feel free to change.