x/tools/gopls: cannot handle large files

[tsatke]

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

$ go version
go version go1.12.5 darwin/amd64

go version go1.12.7 darwin/amd64

$ gopls version
version v0.1.3, built in $GOPATH mode

Does this issue reproduce with the latest release?

Yes, but differently

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

go env 1.12.5 Output

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/user/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/user/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.5/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.5/libexec/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/44/txz_wqq568n4lbh6014ft754hlbqxb/T/go-build952763620=/tmp/go-build -gno-record-gcc-switches -fno-common"

go env 1.12.7 Output

$go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/user/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/user/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.7/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.7/libexec/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/44/txz_wqq568n4lbh6014ft754hlbqxb/T/go-build057133603=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

1.12.5

I generated a 120k LOC with ANTLR, containing some actions (basically code that ANTLR copies from its grammar directly into the code).
I have to implement these actions in a separate file in the same package.
Every time this actions-file is changed and saved, gopls tries to reload the large (unchanged, generated) file, and thus autocompletion on any file is stuck for 10-20 seconds, after what

[Error - 8:49:39 PM] unable to check package: context canceled
	file = file:///Users/user/Development/github.com/gojisvm/gojis/internal/parser/antlr_actions.go

is printed multiple times, but the autocompletion does work again.

1.12.7

Does not print an error, but autocompletion is still stuck for at least 10 seconds.

What did you expect to see?

Pretty much that, but I would like a way to make gopls ignore specific - or in general, generated - files.

What did you see instead?

A practically unusable autocompletion while the file is reloaded.

Maybe related

#33221 , I installed latest instead of master, but it didn't solve the issue (for neither version).

[sylba2050]

Hi, Please set GO111MODULE=on and you can use go get golang.org/x/tools/gopls@latest for get gopls.
gopls version version v0.1.3, built in $GOPATH mode is probably obtained when GO111MODULE is off.

[stamblerre]

@sylba2050: This issue persists regardless of the version of gopls, so I don't think it would matter if the version of gopls is built in $GOPATH mode or not.

Thanks for reporting @TimSatke, I'll investigate this when I have a chance.

[stamblerre]

After some investigation of #33003, it seems like this issue is quite similar. Closing in favor of that issue.

[stamblerre]

Duplicate of #33003