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// Copyright 2015 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.rules.objc;
import static com.google.devtools.build.lib.collect.nestedset.Order.STABLE_ORDER;
import static com.google.devtools.build.lib.rules.objc.XcodeProductType.LIBRARY_STATIC;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.rules.cpp.CppModuleMap;
import com.google.devtools.build.lib.rules.java.J2ObjcConfiguration;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.List;
/**
* Implementation for the "j2objc_library" rule, which exports ObjC source files translated from
* Java source files in java_library rules to dependent objc_binary rules for compilation and
* linking into the final application bundle. See {@link J2ObjcLibraryBaseRule} for details.
*/
public class J2ObjcLibrary implements RuleConfiguredTargetFactory {
public static final String NO_ENTRY_CLASS_ERROR_MSG =
"Entry classes must be specified when flag --compilationMode=opt is on in order to"
+ " perform J2ObjC dead code stripping.";
@Override
public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedException {
checkAttributes(ruleContext);
if (ruleContext.hasErrors()) {
return null;
}
J2ObjcSrcsProvider j2ObjcSrcsProvider = new J2ObjcSrcsProvider.Builder()
.addTransitiveJ2ObjcSrcs(ruleContext)
.addEntryClasses(ruleContext.attributes().get("entry_classes", Type.STRING_LIST))
.build();
ObjcProvider.Builder objcProviderBuilder =
new ObjcProvider.Builder()
.addTransitiveAndPropagate(
ruleContext.getPrerequisite("$jre_emul_lib", Mode.TARGET, ObjcProvider.class))
.addTransitiveAndPropagate(
ruleContext.getPrerequisites("deps", Mode.TARGET, ObjcProvider.class));
XcodeProvider.Builder xcodeProviderBuilder = new XcodeProvider.Builder();
XcodeSupport xcodeSupport =
new XcodeSupport(ruleContext)
.addDependencies(xcodeProviderBuilder, new Attribute("$jre_emul_lib", Mode.TARGET))
.addDependencies(xcodeProviderBuilder, new Attribute("deps", Mode.TARGET));
if (j2ObjcSrcsProvider.hasProtos()) {
// Public J2 in Bazel provides no protobuf_lib, and if OSS users try to sneakily use
// undocumented functionality to reach here, the below code will error.
objcProviderBuilder.addTransitiveAndPropagate(
ruleContext.getPrerequisite("$protobuf_lib", Mode.TARGET, ObjcProvider.class));
xcodeSupport.addDependencies(
xcodeProviderBuilder, new Attribute("$protobuf_lib", Mode.TARGET));
}
for (J2ObjcSource j2objcSource : j2ObjcSrcsProvider.getSrcs()) {
PathFragment genDirHeaderSearchPath =
new PathFragment(
j2objcSource.getObjcFilePath(), ruleContext.getConfiguration().getGenfilesFragment());
objcProviderBuilder.addAll(ObjcProvider.HEADER, j2objcSource.getObjcHdrs());
objcProviderBuilder.add(ObjcProvider.INCLUDE, j2objcSource.getObjcFilePath());
objcProviderBuilder.add(ObjcProvider.INCLUDE, genDirHeaderSearchPath);
xcodeProviderBuilder.addHeaders(j2objcSource.getObjcHdrs());
xcodeProviderBuilder.addUserHeaderSearchPaths(
ImmutableList.of(j2objcSource.getObjcFilePath(), genDirHeaderSearchPath));
}
if (ObjcRuleClasses.objcConfiguration(ruleContext).moduleMapsEnabled()) {
configureModuleMap(ruleContext, objcProviderBuilder, j2ObjcSrcsProvider);
}
ObjcProvider objcProvider = objcProviderBuilder.build();
xcodeSupport.addXcodeSettings(xcodeProviderBuilder, objcProvider, LIBRARY_STATIC);
return new RuleConfiguredTargetBuilder(ruleContext)
.setFilesToBuild(NestedSetBuilder.<Artifact>emptySet(STABLE_ORDER))
.add(RunfilesProvider.class, RunfilesProvider.EMPTY)
.addProvider(J2ObjcSrcsProvider.class, j2ObjcSrcsProvider)
.addProvider(
J2ObjcMappingFileProvider.class, ObjcRuleClasses.j2ObjcMappingFileProvider(ruleContext))
.addProvider(ObjcProvider.class, objcProvider)
.addProvider(XcodeProvider.class, xcodeProviderBuilder.build())
.build();
}
/**
* Configures a module map for all the sources in {@code j2ObjcSrcsProvider}, registering
* an action to generate the module map and exposing that module map through {@code objcProvider}.
*/
private void configureModuleMap(
RuleContext ruleContext,
ObjcProvider.Builder objcProvider,
J2ObjcSrcsProvider j2ObjcSrcsProvider) {
new CompilationSupport(ruleContext).registerJ2ObjcGenerateModuleMapAction(j2ObjcSrcsProvider);
CppModuleMap moduleMap = ObjcRuleClasses.intermediateArtifacts(ruleContext).moduleMap();
objcProvider.add(ObjcProvider.MODULE_MAP, moduleMap.getArtifact());
objcProvider.add(ObjcProvider.TOP_LEVEL_MODULE_MAP, moduleMap);
}
private static void checkAttributes(RuleContext ruleContext) {
checkAttributes(ruleContext, "deps");
checkAttributes(ruleContext, "exports");
}
private static void checkAttributes(RuleContext ruleContext, String attributeName) {
if (!ruleContext.attributes().has(attributeName, BuildType.LABEL_LIST)) {
return;
}
List<String> entryClasses = ruleContext.attributes().get("entry_classes", Type.STRING_LIST);
J2ObjcConfiguration j2objcConfiguration = ruleContext.getFragment(J2ObjcConfiguration.class);
if (j2objcConfiguration.removeDeadCode() && (entryClasses == null || entryClasses.isEmpty())) {
ruleContext.attributeError("entry_classes", NO_ENTRY_CLASS_ERROR_MSG);
}
}
}
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