Expose removeDeadCode from J2ObjcConfiguration

Needed for Starlarkification of j2objc_library

PiperOrigin-RevId: 529415395
Change-Id: Ia428ed84707a9cbec694fca64710ab8790465e43

src/main/java/com/google/devtools/build/lib/rules/objc/J2ObjcConfiguration.java

@@ -20,13 +20,18 @@
 import com.google.devtools.build.lib.analysis.config.Fragment;
 import com.google.devtools.build.lib.analysis.config.RequiresOptions;
 import com.google.devtools.build.lib.analysis.starlark.annotations.StarlarkConfigurationField;
+import com.google.devtools.build.lib.cmdline.BazelModuleContext;
 import com.google.devtools.build.lib.cmdline.Label;
 import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
 import com.google.devtools.build.lib.events.Event;
 import com.google.devtools.build.lib.events.EventHandler;
 import com.google.devtools.build.lib.starlarkbuildapi.apple.J2ObjcConfigurationApi;
 import java.util.Collections;
 import javax.annotation.Nullable;
+import net.starlark.java.eval.EvalException;
+import net.starlark.java.eval.Module;
+import net.starlark.java.eval.Starlark;
+import net.starlark.java.eval.StarlarkThread;
 
 /**
  * A J2ObjC transpiler configuration fragment containing J2ObjC translation flags. This
@@ -125,6 +130,21 @@ public boolean removeDeadCode() {
     return removeDeadCode;
   }
 
+  protected static void checkPrivateAccess(StarlarkThread thread) throws EvalException {
+    Label label =
+        ((BazelModuleContext) Module.ofInnermostEnclosingStarlarkFunction(thread).getClientData())
+            .label();
+    if (!label.getPackageIdentifier().getRepository().getName().equals("_builtins")) {
+      throw Starlark.errorf("Rule in '%s' cannot use private API", label.getPackageName());
+    }
+  }
+
+  @Override
+  public boolean getRemoveDeadCodeForStarlark(StarlarkThread thread) throws EvalException {
+    checkPrivateAccess(thread);
+    return removeDeadCode;
+  }
+
   /**
    * Returns whether to generate J2ObjC header map in a separate action in parallel of the J2ObjC
    * transpilation action.

src/main/java/com/google/devtools/build/lib/starlarkbuildapi/apple/J2ObjcConfigurationApi.java

@@ -18,6 +18,8 @@
 import com.google.devtools.build.docgen.annot.DocCategory;
 import net.starlark.java.annot.StarlarkBuiltin;
 import net.starlark.java.annot.StarlarkMethod;
+import net.starlark.java.eval.EvalException;
+import net.starlark.java.eval.StarlarkThread;
 import net.starlark.java.eval.StarlarkValue;
 
 /** A configuration fragment for j2objc. */
@@ -32,4 +34,7 @@ public interface J2ObjcConfigurationApi extends StarlarkValue {
       structField = true,
       doc = "The list of flags to be used when the j2objc compiler is invoked. ")
   ImmutableList<String> getTranslationFlags();
+
+  @StarlarkMethod(name = "remove_dead_code", documented = false, useStarlarkThread = true)
+  boolean getRemoveDeadCodeForStarlark(StarlarkThread thread) throws EvalException;
 }

src/test/java/com/google/devtools/build/lib/rules/java/JavaStarlarkApiTest.java

@@ -3464,6 +3464,26 @@ public void testRunIjarIsPrivateApi() throws Exception {
     assertContainsEvent("Rule in 'foo' cannot use private API");
   }
 
+  @Test
+  public void testGetRemoveDeadCodeFromJ2ObjcConfigurationForStarlarkIsPrivateAPI()
+      throws Exception {
+    scratch.file(
+        "foo/rule.bzl",
+        "def _impl(ctx):",
+        "  ctx.fragments.j2objc.remove_dead_code()",
+        "  return []",
+        "myrule = rule(",
+        "  implementation=_impl,",
+        "  fragments = ['j2objc']",
+        ")");
+    scratch.file("foo/BUILD", "load(':rule.bzl', 'myrule')", "myrule(name='myrule')");
+    reporter.removeHandler(failFastHandler);
+
+    getConfiguredTarget("//foo:myrule");
+
+    assertContainsEvent("Rule in 'foo' cannot use private API");
+  }
+
   @Test
   public void testGetBuildInfoArtifacts() throws Exception {
     scratch.file(