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cmd/compile: internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) #10219

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omeid opened this issue Mar 23, 2015 · 5 comments
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cmd/compile: internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) #10219

omeid opened this issue Mar 23, 2015 · 5 comments
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FrozenDueToAge
Milestone
Go1.5

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@omeid
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omeid commented Mar 23, 2015 

$ go version
go version go1.4.2 linux/amd64
$ uname -sorp
Linux 3.10.0-123.20.1.el7.x86_64 x86_64 GNU/Linux

How to reproduce:

cd $GOPATH/src && mkdir -p bug/{base,wrapper} && cd bug && echo 'package base

type message struct {
Command string
}

var pathMessage = struct {
message
Path    string
}{
message{"reload"},
"",
}

type Server struct{}

func (s *Server) SendPath(path string) {
r := pathMessage
r.Path = path
}
' > base/base.go && echo 'package wrapper

import (
    "bug/base"
)

func Start() *base.Server {
    return &base.Server{}
}
' > wrapper/wrapper.go; echo 'package bug

import (
    "bug/wrapper"
)

func test() {

    server := wrapper.Start()
    server.SendPath("test")

}
' > bug.go && go build

yields

./bug.go:4: cannot use base.pathMessage (type struct { base.message; Path string  }) as type struct { ? base.message; Path string } in assignment
./bug.go:10: internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) STRUCT-struct { FIELD-@"bug/base".? base.message; FIELD-@"".Path string }
@omeid
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omeid commented Mar 23, 2015

It is worth noting that package base and wrapper compiles just fine.

@ianlancetaylor ianlancetaylor changed the title internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) cmd/gc: internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) Mar 23, 2015
@ianlancetaylor ianlancetaylor added this to the Go1.5 milestone Mar 23, 2015
@ianlancetaylor
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Still happens on tip.

@ianlancetaylor
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This is a compiler crash on a valid program. The program builds successfully with gccgo. The bug appears to be related to inlining.

@ianlancetaylor ianlancetaylor modified the milestones: Go1.4.3, Go1.5 Mar 23, 2015
@josharian
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Also reproduces with Go 1.3.3 and Go 1.2.2, so not a recent regression.

Here's a slightly smaller reproduction. The original error/report is F. There's also a different error message via G.

bug.go:

package bug

import "bug/wrapper"

func test() {
    wrapper.B.F()
    wrapper.B.G()
}

wrapper.go:

package wrapper

import "bug/base"

var B base.T

base.go:

package base

type str string

var m = struct{ str }{}

type T struct{}

func (T) F() {
    r := m
    _ = r
}

func (T) G() {
    r := struct{ str }{str("foo")}
    _ = r
}

omeid added a commit to omeid/go-livereload that referenced this issue Mar 25, 2015
@omeid
Work around golang/go#10219
8cc8820
@rsc rsc changed the title cmd/gc: internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) cmd/compile: internal compiler error: agen: unknown op CONV u(2) l(10) tc(1) implicit(1) Jun 8, 2015
@ianlancetaylor ianlancetaylor modified the milestones: Go1.5, Go1.4.3 Jul 14, 2015
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CL https://golang.org/cl/12241 mentions this issue.

@golang golang locked and limited conversation to collaborators Jul 18, 2016
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@josharian @omeid @ianlancetaylor @gopherbot