cmd/internal/objabi: test runtime package list

This adds a test that all packages imported by runtime are marked as
runtime tests by LookupPkgSpecial. We add two packages that were
missing from the list.

Change-Id: I2545980ab09474de0181cf546541527d8baaf2e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/521700
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/internal/objabi/path_test.go

@@ -4,7 +4,12 @@
 
 package objabi
 
-import "testing"
+import (
+	"internal/testenv"
+	"os/exec"
+	"strings"
+	"testing"
+)
 
 func TestPathToPrefix(t *testing.T) {
 	tests := []struct {
@@ -31,3 +36,28 @@ func TestPathToPrefix(t *testing.T) {
 		}
 	}
 }
+
+func TestRuntimePackageList(t *testing.T) {
+	// Test that all packages imported by the runtime are marked as runtime
+	// packages.
+	testenv.MustHaveGoBuild(t)
+	goCmd, err := testenv.GoTool()
+	if err != nil {
+		t.Fatal(err)
+	}
+	pkgList, err := exec.Command(goCmd, "list", "-deps", "runtime").Output()
+	if err != nil {
+		if err, ok := err.(*exec.ExitError); ok {
+			t.Log(string(err.Stderr))
+		}
+		t.Fatal(err)
+	}
+	for _, pkg := range strings.Split(strings.TrimRight(string(pkgList), "\n"), "\n") {
+		if pkg == "unsafe" {
+			continue
+		}
+		if !LookupPkgSpecial(pkg).Runtime {
+			t.Errorf("package %s is imported by runtime, but not marked Runtime", pkg)
+		}
+	}
+}

src/cmd/internal/objabi/pkgspecial.go

@@ -20,8 +20,6 @@ type PkgSpecial struct {
 	//
 	// This should be set for runtime and all packages it imports, and may be
 	// set for additional packages.
-	//
-	// TODO(austin): Test that all of `go list -deps runtime` is marked Runtime.
 	Runtime bool
 
 	// AllowAsmABI indicates that assembly in this package is allowed to use ABI
@@ -44,6 +42,8 @@ var runtimePkgs = []string{
 	"internal/coverage/rtcov",
 	"internal/cpu",
 	"internal/goarch",
+	"internal/godebugs",
+	"internal/goexperiment",
 	"internal/goos",
 }