com.google.devtools.build.lib.rules.objc.LipoSupport.java Source code

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Here is the source code for com.google.devtools.build.lib.rules.objc.LipoSupport.java

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// Copyright 2016 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 com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.actions.CustomCommandLine;
import com.google.devtools.build.lib.analysis.actions.SymlinkAction;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.rules.apple.AppleConfiguration;
import com.google.devtools.build.lib.rules.apple.Platform;

/**
 * Support for registering actions using the Apple tool "lipo", which combines artifacts of
 * different architectures to make multi-architecture artifacts.
 */
public class LipoSupport {
    private final RuleContext ruleContext;

    public LipoSupport(RuleContext ruleContext) {
        this.ruleContext = ruleContext;
    }

    /**
     * Registers an action to invoke "lipo" on all artifacts in {@code inputBinaries} to create the
     * {@code outputBinary} multi-architecture artifact, built for platform {@code platform}.
     *
     * <p>If there is only one input binary given, since "lipo" is an expensive action, this will only
     * symlink the output location to the input binary.
     *
     * @return this object
     */
    public LipoSupport registerCombineArchitecturesAction(NestedSet<Artifact> inputBinaries, Artifact outputBinary,
            Platform platform) {
        if (inputBinaries.toList().size() > 1) {
            ruleContext.registerAction(ObjcRuleClasses
                    .spawnAppleEnvActionBuilder(ruleContext.getFragment(AppleConfiguration.class), platform)
                    .setMnemonic("ObjcCombiningArchitectures").addTransitiveInputs(inputBinaries)
                    .addOutput(outputBinary).setExecutable(CompilationSupport.xcrunwrapper(ruleContext))
                    .setCommandLine(CustomCommandLine.builder().add(ObjcRuleClasses.LIPO)
                            .addExecPaths("-create", inputBinaries).addExecPath("-o", outputBinary).build())
                    .build(ruleContext));
        } else {
            ruleContext.registerAction(
                    new SymlinkAction(ruleContext.getActionOwner(), Iterables.getOnlyElement(inputBinaries),
                            outputBinary, "Symlinking single-architecture binary"));
        }
        return this;
    }
}