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[dev.typeparams] test: cleanup 'go env' and -goexperiment

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This CL makes two related changes:

1. It uses 'go env -json' to query the environment configuration,
rather than attempting to manually reconstruct the values that cmd/go
is going to use.

2. It changes the -goexperiment flag to *extend* any ambient
GOEXPERIMENT configuration. Notably, this means that '-goexperiment
fieldtrack' now tests fieldtracking in conjunction with any other
experiments (e.g., unified IR). Tests that want to test an exact
GOEXPERIMENT config should use '-goexperiment none,foo' instead.

Change-Id: I96a97198209e540e934fe7035110c3ae3a8f0e6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/332610
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Matthew Dempsky 2021-07-02 15:42:20 -07:00
parent b7149b781f
commit 311baf65f4
1 changed files with 38 additions and 28 deletions
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66
test/run.go
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@ -9,6 +9,7 @@ package main
import (
"bytes"
"encoding/json"
"errors"
"flag"
"fmt"
@ -49,17 +50,36 @@ var (
shards = flag.Int("shards", 0, "number of shards. If 0, all tests are run. This is used by the continuous build.")
)
var unifiedEnabled, defaultGLevels = func() (bool, string) {
// TODO(mdempsky): Change this to just "go env GOEXPERIMENT" after
// CL 328751 is merged back to dev.typeparams. In the mean time, we
// infer whether the "unified" experiment is default enabled by
// inspecting the output from `go tool compile -V`.
output := runOutput(goTool(), "tool", "compile", "-V")
type envVars struct {
GOOS string
GOARCH string
GOEXPERIMENT string
CGO_ENABLED string
}
var env = func() (res envVars) {
cmd := exec.Command("go", "env", "-json")
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Fatal("StdoutPipe:", err)
}
if err := cmd.Start(); err != nil {
log.Fatal("Start:", err)
}
if err := json.NewDecoder(stdout).Decode(&res); err != nil {
log.Fatal("Decode:", err)
}
if err := cmd.Wait(); err != nil {
log.Fatal("Wait:", err)
}
return
}()
var unifiedEnabled, defaultGLevels = func() (bool, string) {
// TODO(mdempsky): This will give false negatives if the unified
// experiment is enabled by default, but presumably at that point we
// won't need to disable tests for it anymore anyway.
enabled := strings.Contains(output, "unified")
enabled := strings.Contains(","+env.GOEXPERIMENT+",", ",unified,")
// Normal test runs should test with both -G=0 and -G=3 for types2
// coverage. But the unified experiment always uses types2, so
@ -81,8 +101,9 @@ func defaultAllCodeGen() bool {
}
var (
goos, goarch string
cgoEnabled bool
goos = env.GOOS
goarch = env.GOARCH
cgoEnabled, _ = strconv.ParseBool(env.CGO_ENABLED)
// dirs are the directories to look for *.go files in.
// TODO(bradfitz): just use all directories?
@ -116,12 +137,6 @@ func main() {
glevels = append(glevels, glevel)
}
goos = getenv("GOOS", runtime.GOOS)
goarch = getenv("GOARCH", runtime.GOARCH)
cgoEnv := runOutput(goTool(), "env", "CGO_ENABLED")
cgoEnabled, _ = strconv.ParseBool(strings.TrimSpace(cgoEnv))
findExecCmd()
// Disable parallelism if printing or if using a simulator.
@ -214,17 +229,6 @@ func main() {
}
}
// runOutput runs the specified command and returns its output as a
// string. If the command fails, runOutput logs the error and exits.
func runOutput(name string, args ...string) string {
cmd := exec.Command(name, args...)
output, err := cmd.Output()
if err != nil {
log.Fatalf("running %v: %v", cmd, err)
}
return string(output)
}
// goTool reports the path of the go tool to use to run the tests.
// If possible, use the same Go used to run run.go, otherwise
// fallback to the go version found in the PATH.
@ -672,6 +676,8 @@ func (t *test) run() {
return
}
goexp := env.GOEXPERIMENT
// collect flags
for len(args) > 0 && strings.HasPrefix(args[0], "-") {
switch args[0] {
@ -698,7 +704,11 @@ func (t *test) run() {
}
case "-goexperiment": // set GOEXPERIMENT environment
args = args[1:]
runenv = append(runenv, "GOEXPERIMENT="+args[0])
if goexp != "" {
goexp += ","
}
goexp += args[0]
runenv = append(runenv, "GOEXPERIMENT="+goexp)
default:
flags = append(flags, args[0])
@ -1258,7 +1268,7 @@ func (t *test) run() {
runInDir = ""
var out []byte
var err error
if len(flags)+len(args) == 0 && t.goGcflagsIsEmpty() && !*linkshared && goarch == runtime.GOARCH && goos == runtime.GOOS {
if len(flags)+len(args) == 0 && t.goGcflagsIsEmpty() && !*linkshared && goarch == runtime.GOARCH && goos == runtime.GOOS && goexp == env.GOEXPERIMENT {
// If we're not using special go command flags,
// skip all the go command machinery.
// This avoids any time the go command would