Fix Autoloads skyframe injection

Before this, changing the value of `--enable_bzlmod` did not invalidate the existing skyframe precomputed value as the instances were considered the same/equal (see `src/main/java/com/google/devtools/build/skyframe/AbstractInMemoryMemoizingEvaluator.java#pruneInjectedValues`)

Fixes bazel-contrib/rules_python#2387

PiperOrigin-RevId: 695696010
Change-Id: I136f2bec4e2c668d020f6cb1a7d3200f7523e5a0

Author: hvadehra

src/main/java/com/google/devtools/build/lib/packages/AutoloadSymbols.java

@@ -541,7 +541,11 @@ public final int hashCode() {
     // These fields are used to generate all other private fields.
     // Thus, other fields don't need to be included in hash code.
     return Objects.hash(
-        autoloadedSymbols, removedSymbols, partiallyRemovedSymbols, reposDisallowingAutoloads);
+        bzlmodEnabled,
+        autoloadedSymbols,
+        removedSymbols,
+        partiallyRemovedSymbols,
+        reposDisallowingAutoloads);
   }
 
   @Override
@@ -553,7 +557,8 @@ public final boolean equals(Object that) {
       AutoloadSymbols other = (AutoloadSymbols) that;
       // These fields are used to generate all other private fields.
       // Thus, other fields don't need to be included in comparison.
-      return this.autoloadedSymbols.equals(other.autoloadedSymbols)
+      return this.bzlmodEnabled == other.bzlmodEnabled
+          && this.autoloadedSymbols.equals(other.autoloadedSymbols)
           && this.removedSymbols.equals(other.removedSymbols)
           && this.partiallyRemovedSymbols.equals(other.partiallyRemovedSymbols)
           && this.reposDisallowingAutoloads.equals(other.reposDisallowingAutoloads);

src/test/java/com/google/devtools/build/lib/bazel/rules/AutoloadSymbolsTest.java

@@ -0,0 +1,57 @@
+// Copyright 2024 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.lib.bazel.rules;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
+import com.google.devtools.build.lib.packages.AutoloadSymbols;
+import com.google.devtools.build.lib.skyframe.PrecomputedValue;
+import com.google.devtools.build.skyframe.EvaluationContext;
+import com.google.devtools.build.skyframe.SkyKey;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class AutoloadSymbolsTest extends BuildViewTestCase {
+
+  private static final SkyKey AUTOLOAD_SYMBOLS_KEY = AutoloadSymbols.AUTOLOAD_SYMBOLS.getKey();
+  private static final ImmutableList<SkyKey> KEYS_TO_EVALUATE =
+      ImmutableList.of(AUTOLOAD_SYMBOLS_KEY);
+
+  @Test
+  public void bzlmodFlagUpdatesAutoloadConfig() throws Exception {
+    EvaluationContext context =
+        EvaluationContext.newBuilder().setParallelism(1).setEventHandler(reporter).build();
+
+    setBuildLanguageOptions("--enable_bzlmod");
+    AutoloadSymbols value1 = evaluateAutoloads(context);
+    setBuildLanguageOptions("--noenable_bzlmod");
+    AutoloadSymbols value2 = evaluateAutoloads(context);
+
+    assertThat(value1).isNotSameInstanceAs(value2);
+  }
+
+  private AutoloadSymbols evaluateAutoloads(EvaluationContext context) throws InterruptedException {
+    return (AutoloadSymbols)
+        ((PrecomputedValue)
+                skyframeExecutor
+                    .getEvaluator()
+                    .evaluate(KEYS_TO_EVALUATE, context)
+                    .get(AUTOLOAD_SYMBOLS_KEY))
+            .get();
+  }
+}

src/test/java/com/google/devtools/build/lib/bazel/rules/BUILD

@@ -32,11 +32,15 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/bazel/rules",
         "//src/main/java/com/google/devtools/build/lib/cmdline",
         "//src/main/java/com/google/devtools/build/lib/packages",
+        "//src/main/java/com/google/devtools/build/lib/packages:autoload_symbols",
         "//src/main/java/com/google/devtools/build/lib/rules:core_workspace_rules",
         "//src/main/java/com/google/devtools/build/lib/rules/config",
         "//src/main/java/com/google/devtools/build/lib/rules/core",
+        "//src/main/java/com/google/devtools/build/lib/skyframe:precomputed_value",
         "//src/main/java/com/google/devtools/build/lib/util:os",
         "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
+        "//src/main/java/com/google/devtools/build/skyframe",
+        "//src/main/java/com/google/devtools/build/skyframe:skyframe-objects",
         "//src/main/java/com/google/devtools/common/options",
         "//src/test/java/com/google/devtools/build/lib/analysis/util",
         "//third_party:guava",