com.facebook.buck.swift.SwiftRuntimeNativeLinkable.java Source code

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Here is the source code for com.facebook.buck.swift.SwiftRuntimeNativeLinkable.java

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/*
 * Copyright 2016-present Facebook, Inc.
 *
 * 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.facebook.buck.swift;

import static com.facebook.buck.model.UnflavoredBuildTarget.BUILD_TARGET_PREFIX;

import com.facebook.buck.cxx.CxxPlatform;
import com.facebook.buck.cxx.Linker;
import com.facebook.buck.cxx.NativeLinkable;
import com.facebook.buck.cxx.NativeLinkableInput;
import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.parser.NoSuchBuildTargetException;
import com.facebook.buck.rules.SourcePath;
import com.facebook.buck.rules.args.StringArg;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;

import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * Pseudo linkable for representing Swift runtime library's linker arguments.
 */
final class SwiftRuntimeNativeLinkable implements NativeLinkable {

    private static final String SWIFT_RUNTIME = "_swift_runtime";

    private static final BuildTarget PSEUDO_BUILD_TARGET = BuildTarget
            .builder(Paths.get(SWIFT_RUNTIME), BUILD_TARGET_PREFIX + SWIFT_RUNTIME, SWIFT_RUNTIME).build();
    private final SwiftPlatform swiftPlatform;

    SwiftRuntimeNativeLinkable(SwiftPlatform swiftPlatform) {
        this.swiftPlatform = swiftPlatform;
    }

    @Override
    public BuildTarget getBuildTarget() {
        return PSEUDO_BUILD_TARGET;
    }

    @Override
    public Iterable<? extends NativeLinkable> getNativeLinkableDeps() {
        return ImmutableSet.of();
    }

    @Override
    public Iterable<? extends NativeLinkable> getNativeLinkableExportedDeps() {
        return ImmutableSet.of();
    }

    @Override
    public NativeLinkableInput getNativeLinkableInput(CxxPlatform cxxPlatform, Linker.LinkableDepType type)
            throws NoSuchBuildTargetException {
        NativeLinkableInput.Builder inputBuilder = NativeLinkableInput.builder();

        ImmutableSet<Path> swiftRuntimePaths = type == Linker.LinkableDepType.SHARED ? ImmutableSet.of()
                : swiftPlatform.getSwiftStaticRuntimePaths();

        // Fall back to shared if static isn't supported on this platform.
        if (type == Linker.LinkableDepType.SHARED || swiftRuntimePaths.isEmpty()) {
            inputBuilder.addAllArgs(StringArg.from("-Xlinker", "-rpath", "-Xlinker", "@executable_path/Frameworks",
                    "-Xlinker", "-rpath", "-Xlinker", "@loader_path/Frameworks"));
            swiftRuntimePaths = swiftPlatform.getSwiftRuntimePaths();
        } else {
            // Static linking requires force-loading Swift libs, since the dependency
            // discovery mechanism is disabled otherwise.
            inputBuilder.addAllArgs(StringArg.from("-Xlinker", "-force_load_swift_libs"));
        }
        for (Path swiftRuntimePath : swiftRuntimePaths) {
            inputBuilder.addAllArgs(StringArg.from("-L", swiftRuntimePath.toString()));
        }
        return inputBuilder.build();
    }

    @Override
    public Linkage getPreferredLinkage(CxxPlatform cxxPlatform) {
        return Linkage.ANY;
    }

    @Override
    public ImmutableMap<String, SourcePath> getSharedLibraries(CxxPlatform cxxPlatform)
            throws NoSuchBuildTargetException {
        return ImmutableMap.of();
    }
}