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// 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.rules.cpp;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.Runfiles;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.rules.cpp.CcCompilationHelper.CompilationInfo;
import com.google.devtools.build.lib.rules.cpp.CcLinkingHelper.LinkingInfo;
import com.google.devtools.build.lib.rules.cpp.CcToolchainFeatures.FeatureConfiguration;
import com.google.devtools.build.lib.rules.cpp.CppConfiguration.HeadersCheckingMode;
import com.google.devtools.build.lib.rules.cpp.LinkerInputs.LibraryToLink;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.vfs.PathFragment;
/**
* A ConfiguredTarget for <code>cc_import</code> rule.
*/
public abstract class CcImport implements RuleConfiguredTargetFactory {
private final CppSemantics semantics;
protected CcImport(CppSemantics semantics) {
this.semantics = semantics;
}
@Override
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException, ActionConflictException {
Artifact staticLibrary = ruleContext.getPrerequisiteArtifact("static_library", Mode.TARGET);
Artifact sharedLibrary = ruleContext.getPrerequisiteArtifact("shared_library", Mode.TARGET);
Artifact interfaceLibrary =
ruleContext.getPrerequisiteArtifact("interface_library", Mode.TARGET);
boolean systemProvided = ruleContext.attributes().get("system_provided", Type.BOOLEAN);
// If the shared library will be provided by system during runtime, users are not supposed to
// specify shared_library.
if (systemProvided && sharedLibrary != null) {
ruleContext.ruleError(
"'shared_library' shouldn't be specified when 'system_provided' is true");
}
// If a shared library won't be provided by system during runtime and we are linking the shared
// library through interface library, the shared library must be specified.
if (!systemProvided && sharedLibrary == null && interfaceLibrary != null) {
ruleContext.ruleError(
"'shared_library' should be specified when 'system_provided' is false");
}
// Create CcCompilationHelper
CcToolchainProvider ccToolchain =
CppHelper.getToolchainUsingDefaultCcToolchainAttribute(ruleContext);
FeatureConfiguration featureConfiguration =
CcCommon.configureFeaturesOrReportRuleError(ruleContext, ccToolchain);
FdoSupportProvider fdoSupport =
CppHelper.getFdoSupportUsingDefaultCcToolchainAttribute(ruleContext);
// Add headers to compilation step.
final CcCommon common = new CcCommon(ruleContext);
CompilationInfo compilationInfo =
new CcCompilationHelper(
ruleContext, semantics, featureConfiguration, ccToolchain, fdoSupport)
.addPublicHeaders(common.getHeaders())
.setHeadersCheckingMode(HeadersCheckingMode.STRICT)
.compile();
// Get alwayslink attribute
boolean alwayslink = ruleContext.attributes().get("alwayslink", Type.BOOLEAN);
ArtifactCategory staticLibraryCategory =
alwayslink ? ArtifactCategory.ALWAYSLINK_STATIC_LIBRARY : ArtifactCategory.STATIC_LIBRARY;
PathFragment labelName = PathFragment.create(ruleContext.getLabel().getName());
String libraryIdentifier =
ruleContext
.getPackageDirectory()
.getRelative(labelName.replaceName("lib" + labelName.getBaseName()))
.getPathString();
CcLinkingHelper linkingHelper =
new CcLinkingHelper(
ruleContext,
semantics,
featureConfiguration,
ccToolchain,
fdoSupport,
ruleContext.getConfiguration());
if (staticLibrary != null) {
if (CppFileTypes.PIC_ARCHIVE.matches(staticLibrary.getPath())) {
linkingHelper.addPicStaticLibraries(
ImmutableList.of(
LinkerInputs.opaqueLibraryToLink(
staticLibrary, staticLibraryCategory, libraryIdentifier)));
} else {
linkingHelper.addStaticLibraries(
ImmutableList.of(
LinkerInputs.opaqueLibraryToLink(
staticLibrary, staticLibraryCategory, libraryIdentifier)));
}
}
// Now we are going to have some platform dependent behaviors
boolean targetWindows = featureConfiguration.isEnabled(CppRuleClasses.TARGETS_WINDOWS);
Iterable<LibraryToLink> dynamicLibraryForLinkingList = null;
Iterable<LibraryToLink> dynamicLibrariesForRuntimeList = null;
if (sharedLibrary != null) {
if (targetWindows) {
dynamicLibrariesForRuntimeList =
ImmutableList.of(
LinkerInputs.opaqueLibraryToLink(
sharedLibrary, ArtifactCategory.DYNAMIC_LIBRARY, libraryIdentifier));
} else {
dynamicLibrariesForRuntimeList =
ImmutableList.of(
LinkerInputs.solibLibraryToLink(
common.getDynamicLibrarySymlink(sharedLibrary, true),
sharedLibrary,
libraryIdentifier));
}
linkingHelper.addDynamicLibrariesForRuntime(dynamicLibrariesForRuntimeList);
}
if (interfaceLibrary != null) {
if (targetWindows) {
dynamicLibraryForLinkingList =
ImmutableList.of(
LinkerInputs.opaqueLibraryToLink(
interfaceLibrary, ArtifactCategory.INTERFACE_LIBRARY, libraryIdentifier));
} else {
dynamicLibraryForLinkingList =
ImmutableList.of(
LinkerInputs.solibLibraryToLink(
common.getDynamicLibrarySymlink(interfaceLibrary, true),
interfaceLibrary,
libraryIdentifier));
}
} else {
// If interface_library is not specified and we are not building for Windows, then the dynamic
// library required at linking time is the same as the one required at execution time.
if (!targetWindows) {
dynamicLibraryForLinkingList = dynamicLibrariesForRuntimeList;
} else if (sharedLibrary != null) {
ruleContext.ruleError(
"'interface library' must be specified when using cc_import for shared library on"
+ " Windows");
}
}
if (dynamicLibraryForLinkingList != null) {
linkingHelper.addDynamicLibrariesForLinking(dynamicLibraryForLinkingList);
}
LinkingInfo linkingInfo =
linkingHelper.link(
compilationInfo.getCcCompilationOutputs(), compilationInfo.getCcCompilationContext());
return new RuleConfiguredTargetBuilder(ruleContext)
.addProviders(compilationInfo.getProviders())
.addProviders(linkingInfo.getProviders())
.addSkylarkTransitiveInfo(CcSkylarkApiProvider.NAME, new CcSkylarkApiProvider())
.addOutputGroups(
CcCommon.mergeOutputGroups(
ImmutableList.of(compilationInfo.getOutputGroups(), linkingInfo.getOutputGroups())))
.addProvider(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY))
.build();
}
}
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