Automated rollback of commit 2b983bdf508e010a3d4ee9dbaf446b7666749799.

*** Reason for rollback ***

Breaks rules_go CI

*** Original change description ***

Rollforward of c++ toolchain-relevant BUILD file and Bazel mocking changes.  That is, a c++ toolchain is added, but a Bazel dependency on that toolchain is not.

PiperOrigin-RevId: 167198874

10 files changed, 47 insertions, 128 deletions

diff --git a/src/create_embedded_tools.py b/src/create_embedded_tools.py
index 668db213fe..699edd09f5 100644
--- a/src/create_embedded_tools.py
+++ b/src/create_embedded_tools.py
@@ -29,8 +29,8 @@ from src.create_embedded_tools_lib import is_executable
 
 output_paths = [
     ('*tools/jdk/BUILD*', lambda x: 'tools/jdk/BUILD'),
-    ('*tools/platforms/platforms.BUILD', lambda x: 'tools/platforms/BUILD'),
-    ('*tools/platforms/*', lambda x: 'tools/platforms/' + os.path.basename(x)),
+    ('*tools/platforms/platforms.BUILD', lambda x: 'platforms/BUILD'),
+    ('*tools/platforms/*', lambda x: 'platforms/' + os.path.basename(x)),
     ('*JavaBuilder*_deploy.jar', lambda x: 'tools/jdk/' + os.path.basename(x)),
     ('*JacocoCoverage*_deploy.jar',
      lambda x: 'tools/jdk/JacocoCoverage_deploy.jar'),
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java b/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
index f52d66f209..817f4d163e 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
@@ -182,60 +182,41 @@ public class BaseRuleClasses {
    * Share common attributes across both base and Skylark base rules.
    */
   public static RuleClass.Builder commonCoreAndSkylarkAttributes(RuleClass.Builder builder) {
-    return PlatformSemantics.platformAttributes(builder)
+    return builder
         // The visibility attribute is special: it is a nodep label, and loading the
         // necessary package groups is handled by {@link LabelVisitor#visitTargetVisibility}.
         // Package groups always have the null configuration so that they are not duplicated
         // needlessly.
-        .add(
-            attr("visibility", NODEP_LABEL_LIST)
-                .orderIndependent()
-                .cfg(HOST)
-                .nonconfigurable(
-                    "special attribute integrated more deeply into Bazel's core logic"))
-        .add(
-            attr("deprecation", STRING)
-                .value(deprecationDefault)
-                .nonconfigurable("Used in core loading phase logic with no access to configs"))
-        .add(
-            attr("tags", STRING_LIST)
-                .orderIndependent()
-                .taggable()
-                .nonconfigurable("low-level attribute, used in TargetUtils without configurations"))
-        .add(
-            attr("generator_name", STRING)
-                .undocumented("internal")
-                .nonconfigurable("static structure of a rule"))
-        .add(
-            attr("generator_function", STRING)
-                .undocumented("internal")
-                .nonconfigurable("static structure of a rule"))
-        .add(
-            attr("generator_location", STRING)
-                .undocumented("internal")
-                .nonconfigurable("static structure of a rule"))
-        .add(
-            attr("testonly", BOOLEAN)
-                .value(testonlyDefault)
-                .nonconfigurable("policy decision: rules testability should be consistent"))
+        .add(attr("visibility", NODEP_LABEL_LIST).orderIndependent().cfg(HOST)
+            .nonconfigurable("special attribute integrated more deeply into Bazel's core logic"))
+        .add(attr("deprecation", STRING).value(deprecationDefault)
+            .nonconfigurable("Used in core loading phase logic with no access to configs"))
+        .add(attr("tags", STRING_LIST).orderIndependent().taggable()
+            .nonconfigurable("low-level attribute, used in TargetUtils without configurations"))
+        .add(attr("generator_name", STRING).undocumented("internal")
+            .nonconfigurable("static structure of a rule"))
+        .add(attr("generator_function", STRING).undocumented("internal")
+            .nonconfigurable("static structure of a rule"))
+        .add(attr("generator_location", STRING).undocumented("internal")
+            .nonconfigurable("static structure of a rule"))
+        .add(attr("testonly", BOOLEAN).value(testonlyDefault)
+            .nonconfigurable("policy decision: rules testability should be consistent"))
         .add(attr("features", STRING_LIST).orderIndependent())
         .add(attr(":action_listener", LABEL_LIST).cfg(HOST).value(ACTION_LISTENER))
-        .add(
-            attr(RuleClass.COMPATIBLE_ENVIRONMENT_ATTR, LABEL_LIST)
-                .allowedRuleClasses(EnvironmentRule.RULE_NAME)
-                .cfg(Attribute.ConfigurationTransition.HOST)
-                .allowedFileTypes(FileTypeSet.NO_FILE)
-                .dontCheckConstraints()
-                .nonconfigurable(
-                    "special logic for constraints and select: see ConstraintSemantics"))
-        .add(
-            attr(RuleClass.RESTRICTED_ENVIRONMENT_ATTR, LABEL_LIST)
-                .allowedRuleClasses(EnvironmentRule.RULE_NAME)
-                .cfg(Attribute.ConfigurationTransition.HOST)
-                .allowedFileTypes(FileTypeSet.NO_FILE)
-                .dontCheckConstraints()
-                .nonconfigurable(
-                    "special logic for constraints and select: see ConstraintSemantics"));
+        .add(attr(RuleClass.COMPATIBLE_ENVIRONMENT_ATTR, LABEL_LIST)
+            .allowedRuleClasses(EnvironmentRule.RULE_NAME)
+            .cfg(Attribute.ConfigurationTransition.HOST)
+            .allowedFileTypes(FileTypeSet.NO_FILE)
+            .dontCheckConstraints()
+            .nonconfigurable("special logic for constraints and select: see ConstraintSemantics")
+        )
+        .add(attr(RuleClass.RESTRICTED_ENVIRONMENT_ATTR, LABEL_LIST)
+            .allowedRuleClasses(EnvironmentRule.RULE_NAME)
+            .cfg(Attribute.ConfigurationTransition.HOST)
+            .allowedFileTypes(FileTypeSet.NO_FILE)
+            .dontCheckConstraints()
+            .nonconfigurable("special logic for constraints and select: see ConstraintSemantics")
+        );
   }
 
   public static RuleClass.Builder nameAttribute(RuleClass.Builder builder) {
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/PlatformOptions.java b/src/main/java/com/google/devtools/build/lib/analysis/PlatformOptions.java
index 3a84352105..3376e9609d 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/PlatformOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/PlatformOptions.java
@@ -36,7 +36,7 @@ public class PlatformOptions extends FragmentOptions {
   @Option(
     name = "experimental_host_platform",
     converter = BuildConfiguration.LabelConverter.class,
-    defaultValue = "@bazel_tools//tools/platforms:host_platform",
+    defaultValue = "@bazel_tools//platforms:host_platform",
     documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
     effectTags = {OptionEffectTag.UNKNOWN},
     metadataTags = {OptionMetadataTag.HIDDEN},
@@ -49,7 +49,7 @@ public class PlatformOptions extends FragmentOptions {
   @Option(
     name = "experimental_platforms",
     converter = BuildConfiguration.LabelListConverter.class,
-    defaultValue = "@bazel_tools//tools/platforms:target_platform",
+    defaultValue = "@bazel_tools//platforms:target_platform",
     documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
     effectTags = {OptionEffectTag.UNKNOWN},
     metadataTags = {OptionMetadataTag.HIDDEN},
@@ -98,8 +98,6 @@ public class PlatformOptions extends FragmentOptions {
   public PlatformOptions getHost(boolean fallback) {
     PlatformOptions host = (PlatformOptions) getDefault();
     host.platforms = ImmutableList.of(this.hostPlatform);
-    host.hostPlatform = this.hostPlatform;
-    host.extraToolchains = this.extraToolchains;
     return host;
   }
 
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/PlatformSemantics.java b/src/main/java/com/google/devtools/build/lib/analysis/PlatformSemantics.java
index 45c967e551..d93c5a6dea 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/PlatformSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/PlatformSemantics.java
@@ -26,7 +26,6 @@ import com.google.devtools.build.lib.packages.AttributeMap;
 import com.google.devtools.build.lib.packages.Rule;
 import com.google.devtools.build.lib.packages.RuleClass;
 import java.util.List;
-import javax.annotation.Nullable;
 
 /** Helper class to manage rules' use of platforms. */
 public class PlatformSemantics {
@@ -41,22 +40,19 @@ public class PlatformSemantics {
         @Override
         public List<Label> resolve(
             Rule rule, AttributeMap attributes, BuildConfiguration configuration) {
-          // rule may be null for tests
-          if (rule == null || rule.getRuleClassObject().getRequiredToolchains().isEmpty()) {
-            return ImmutableList.of();
+          if (rule.getRuleClassObject().getRequiredToolchains().isEmpty()) {
+            return null;
           }
           return configuration.getFragment(PlatformConfiguration.class).getTargetPlatforms();
         }
       };
 
   /** Implementation for the :execution_platform attribute. */
-  @Nullable
   public static final Attribute.LateBoundLabel<BuildConfiguration> EXECUTION_PLATFORM =
       new Attribute.LateBoundLabel<BuildConfiguration>(PlatformConfiguration.class) {
         @Override
         public Label resolve(Rule rule, AttributeMap attributes, BuildConfiguration configuration) {
-          // rule may be null for tests
-          if (rule == null || rule.getRuleClassObject().getRequiredToolchains().isEmpty()) {
+          if (rule.getRuleClassObject().getRequiredToolchains().isEmpty()) {
             return null;
           }
           return configuration.getFragment(PlatformConfiguration.class).getExecutionPlatform();
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/ToolchainContext.java b/src/main/java/com/google/devtools/build/lib/analysis/ToolchainContext.java
index 16a29fd5df..9cbdd475ac 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/ToolchainContext.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/ToolchainContext.java
@@ -142,8 +142,6 @@ public class ToolchainContext {
         prerequisiteMap
             .keys()
             .stream()
-            // Keys in prerequisiteMap can be null, see {@link DependencyResolver#dependentNodeMap}.
-            .filter(attribute -> attribute != null)
             .filter(attribute -> attribute.getName().equals(PlatformSemantics.TOOLCHAINS_ATTR))
             .findFirst();
     Preconditions.checkState(
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
index 6c8487364d..3e850d966d 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
@@ -39,6 +39,7 @@ import com.google.devtools.build.lib.analysis.ActionsProvider;
 import com.google.devtools.build.lib.analysis.BaseRuleClasses;
 import com.google.devtools.build.lib.analysis.DefaultInfo;
 import com.google.devtools.build.lib.analysis.OutputGroupProvider;
+import com.google.devtools.build.lib.analysis.PlatformSemantics;
 import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
 import com.google.devtools.build.lib.analysis.skylark.SkylarkAttr.Descriptor;
 import com.google.devtools.build.lib.analysis.test.TestConfiguration;
@@ -128,9 +129,10 @@ public class SkylarkRuleClassFunctions {
   /** Parent rule class for non-executable non-test Skylark rules. */
   public static final RuleClass baseRule =
       BaseRuleClasses.commonCoreAndSkylarkAttributes(
-              BaseRuleClasses.nameAttribute(
-                      new RuleClass.Builder("$base_rule", RuleClassType.ABSTRACT, true))
-                  .add(attr("expect_failure", STRING)))
+              PlatformSemantics.platformAttributes(
+                  BaseRuleClasses.nameAttribute(
+                          new RuleClass.Builder("$base_rule", RuleClassType.ABSTRACT, true))
+                      .add(attr("expect_failure", STRING))))
           .build();
 
   /** Parent rule class for executable non-test Skylark rules. */
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/BuildViewTest.java b/src/test/java/com/google/devtools/build/lib/analysis/BuildViewTest.java
index 83bcdad904..183c8c05f7 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/BuildViewTest.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/BuildViewTest.java
@@ -1238,8 +1238,8 @@ public class BuildViewTest extends BuildViewTestBase {
     useConfiguration("--experimental_dynamic_configs=on");
     AnalysisResult res = update("//foo:x");
     ConfiguredTarget topLevelTarget = Iterables.getOnlyElement(res.getTargetsToBuild());
-    assertThat(topLevelTarget.getConfiguration().getAllFragments().keySet())
-        .containsExactly(ruleClassProvider.getUniversalFragment(), PlatformConfiguration.class);
+    assertThat(topLevelTarget.getConfiguration().getAllFragments().keySet()).containsExactly(
+        ruleClassProvider.getUniversalFragment());
   }
 
   @Test
diff --git a/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java b/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java
index 862b213eab..0defa523b1 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java
@@ -77,6 +77,7 @@ public final class BazelMockCcSupport extends MockCcSupport {
     config.create(
         "/bazel_tools_workspace/tools/cpp/BUILD",
         "package(default_visibility=['//visibility:public'])",
+        "toolchain_type(name = 'toolchain_type')",
         "cc_library(name = 'stl')",
         "cc_library(name = 'malloc')",
         "cc_toolchain_suite(",
@@ -122,7 +123,7 @@ public final class BazelMockCcSupport extends MockCcSupport {
         "    linker_files = ':empty',",
         "    module_map = 'crosstool.cppmap', supports_header_parsing = 1,",
         "    objcopy_files = ':empty', static_runtime_libs = [':empty'], strip_files = ':empty',",
-        ")",
+        ")", 
         "cc_toolchain(name = 'cc-compiler-armeabi-v7a', all_files = ':empty', ",
         "    compiler_files = ':empty',",
         "    cpu = 'local', dwp_files = ':empty', dynamic_runtime_libs = [':empty'], ",
@@ -144,27 +145,8 @@ public final class BazelMockCcSupport extends MockCcSupport {
         "filegroup(",
         "    name = 'link_dynamic_library',",
         "    srcs = ['link_dynamic_library.sh'],",
-        ")",
-        "toolchain_type(name = 'toolchain_type')",
-        "toolchain(",
-        "   name = 'toolchain_cc-compiler-piii',",
-        "   toolchain_type = ':toolchain_type',",
-        "   toolchain = '//third_party/crosstool/mock:cc-compiler-piii',",
-        "   target_compatible_with = [':mock_value'],",
-        ")",
-        "toolchain(",
-        "   name = 'dummy_cc_toolchain',",
-        "   toolchain_type = ':toolchain_type',",
-        "   toolchain = ':dummy_cc_toolchain_impl',",
-        ")",
-        "load(':dummy_toolchain.bzl', 'dummy_toolchain')",
-        "dummy_toolchain(name = 'dummy_cc_toolchain_impl')");
-    config.create(
-        "/bazel_tools_workspace/tools/cpp/dummy_toolchain.bzl",
-        "def _dummy_toolchain_impl(ctx):",
-        "   toolchain = platform_common.ToolchainInfo()",
-        "   return [toolchain]",
-        "dummy_toolchain = rule(_dummy_toolchain_impl, attrs = {})");
+        ")");
+
     config.create(
         "/bazel_tools_workspace/tools/cpp/CROSSTOOL",
         readCrosstoolFile());
@@ -174,7 +156,6 @@ public final class BazelMockCcSupport extends MockCcSupport {
       config.create("tools/cpp/link_dynamic_library.sh", "");
     }
     MockObjcSupport.setup(config);
-    MockPlatformSupport.setup(config, "/bazel_tools_workspace/tools/platforms");
   }
 
   @Override
diff --git a/src/test/java/com/google/devtools/build/lib/packages/util/MockPlatformSupport.java b/src/test/java/com/google/devtools/build/lib/packages/util/MockPlatformSupport.java
deleted file mode 100644
index f2d89fbbe4..0000000000
--- a/src/test/java/com/google/devtools/build/lib/packages/util/MockPlatformSupport.java
+++ /dev/null
@@ -1,36 +0,0 @@
-// Copyright 2017 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.packages.util;
-
-import java.io.IOException;
-
-/** Mocking support for platforms and toolchains. */
-public class MockPlatformSupport {
-
-  /** Adds mocks for basic host and target platform. */
-  public static void setup(MockToolsConfig mockToolsConfig, String platformsPath)
-      throws IOException {
-    mockToolsConfig.create(
-        platformsPath + "/BUILD",
-        "package(default_visibility=['//visibility:public'])",
-        "platform(",
-        "   name = 'target_platform',",
-        "   target_platform = True,",
-        ")",
-        "platform(",
-        "   name = 'host_platform',",
-        "   host_platform = True,",
-        ")");
-  }
-}
diff --git a/src/test/java/com/google/devtools/build/lib/rules/cpp/CcCommonTest.java b/src/test/java/com/google/devtools/build/lib/rules/cpp/CcCommonTest.java
index 2ff18b4379..2547d354f3 100644
--- a/src/test/java/com/google/devtools/build/lib/rules/cpp/CcCommonTest.java
+++ b/src/test/java/com/google/devtools/build/lib/rules/cpp/CcCommonTest.java
@@ -977,7 +977,6 @@ public class CcCommonTest extends BuildViewTestCase {
           BazelRuleClassProvider.BAZEL_SETUP.init(builder);
           CoreRules.INSTANCE.init(builder);
           BazelRuleClassProvider.CORE_WORKSPACE_RULES.init(builder);
-          BazelRuleClassProvider.PLATFORM_RULES.init(builder);
           BazelRuleClassProvider.GENERIC_RULES.init(builder);
           BazelRuleClassProvider.CPP_RULES.init(builder);
           builder.addRuleDefinition(new OnlyCppToolchainTypeRule());