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cmd/compile: internal compiler error: Type.Elem UNSAFEPTR #30254

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LastPossum opened this issue Feb 15, 2019 · 4 comments
Closed

cmd/compile: internal compiler error: Type.Elem UNSAFEPTR #30254

LastPossum opened this issue Feb 15, 2019 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided.
Milestone
Go1.13

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@LastPossum
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LastPossum commented Feb 15, 2019 •
edited

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

$ go version
go version go1.11.5 darwin/amd64

Does this issue reproduce with the latest release?

It's latest release

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

go env Output
$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/egartman/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/egartman/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
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/mv/gfk793qd08b1kj0qcxt5cf_40000gn/T/go-build087446295=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Ran this test:

package main

import (
	"reflect"
	"testing"
	"unsafe"
)

//go:linkname memmove runtime.memmove
func memmove(to, from unsafe.Pointer, n uintptr)

func TestMemmove(t *testing.T) {
	from := []byte{1, 2, 3, 4, 5}
	to := []byte{7, 7, 7, 7, 7}
	want := []byte{7, 1, 2, 3, 7}
	memmove(unsafe.Pointer(&to[1]), unsafe.Pointer(&from[1]), uintptr(3))
	if !reflect.DeepEqual(to, want) {
		t.Fatalf("unexpected %v, want %v", to, want)
	}
}

What did you expect to see?

Test running

What did you see instead?

:1: internal compiler error: Type.Elem UNSAFEPTR
@bcmills
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bcmills commented Feb 15, 2019

Does this issue reproduce with go1.12rc1?

@bcmills bcmills changed the title internal compiler error: Type.Elem UNSAFEPTR cmd/compile: internal compiler error: Type.Elem UNSAFEPTR Feb 15, 2019
@bcmills
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bcmills commented Feb 15, 2019

CC @randall77 @griesemer

@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Feb 15, 2019
@bcmills bcmills added this to the Go1.13 milestone Feb 15, 2019
@bcmills bcmills added the WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided. label Feb 15, 2019
@LastPossum
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Does this issue reproduce with go1.12rc1?

No. It works fine.

> go version
go version go1.12rc1 darwin/amd64

> go test
--- FAIL: TestMemmove (0.00s)
    memmove_test.go:18: unexpected [7 2 3 4 7], want [7 1 2 3 7]
FAIL
exit status 1
FAIL    testing.fun/unescape    0.005s

@mvdan
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mvdan commented Feb 15, 2019

Duplicate of #30061, it seems. If you'd like it backported to 1.11, leave a comment there.

@mvdan mvdan closed this as completed Feb 15, 2019
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@LastPossum @mvdan @bcmills @gopherbot