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CcToolchainSuite.java
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CcToolchainSuite.java
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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.cpp;
import com.google.common.base.Strings;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.LicensesProvider;
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.TemplateVariableInfo;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.BuiltinProvider;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Implementation of the {@code cc_toolchain_suite} rule.
*
* <p>This is currently a no-op because the logic that transforms this rule into something that can
* be understood by the {@code cc_*} rules is in {@link
* com.google.devtools.build.lib.rules.cpp.CppConfiguration}.
*/
public class CcToolchainSuite implements RuleConfiguredTargetFactory {
@Override
@Nullable
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException, ActionConflictException {
CppConfiguration cppConfiguration = ruleContext.getFragment(CppConfiguration.class);
String transformedCpu = ruleContext.getConfiguration().getCpu();
String compiler = cppConfiguration.getCompilerFromOptions();
String key = transformedCpu + (Strings.isNullOrEmpty(compiler) ? "" : ("|" + compiler));
Map<String, Label> toolchains =
ruleContext.attributes().get("toolchains", BuildType.LABEL_DICT_UNARY);
Label selectedCcToolchain = toolchains.get(key);
CcToolchainProvider ccToolchainProvider;
if (CppHelper.useToolchainResolution(ruleContext)) {
// This is a platforms build (and the user requested to build this suite explicitly).
// Cc_toolchains provide CcToolchainInfo already. Let's select the CcToolchainProvider from
// toolchains and provide it here as well.
ccToolchainProvider =
selectCcToolchain(
CcToolchainProvider.PROVIDER,
ruleContext,
transformedCpu,
compiler,
selectedCcToolchain);
} else {
// This is not a platforms build, and cc_toolchain_suite is the one responsible for creating
// and providing CcToolchainInfo.
CcToolchainAttributesProvider selectedAttributes =
selectCcToolchain(
CcToolchainAttributesProvider.PROVIDER,
ruleContext,
transformedCpu,
compiler,
selectedCcToolchain);
ccToolchainProvider =
CcToolchainProviderHelper.getCcToolchainProvider(ruleContext, selectedAttributes);
if (ccToolchainProvider == null) {
// Skyframe restart
return null;
}
}
CcCommon.reportInvalidOptions(ruleContext, cppConfiguration, ccToolchainProvider);
TemplateVariableInfo templateVariableInfo =
CcToolchain.createMakeVariableProvider(
ccToolchainProvider,
ruleContext.getRule().getLocation());
RuleConfiguredTargetBuilder builder =
new RuleConfiguredTargetBuilder(ruleContext)
.addNativeDeclaredProvider(ccToolchainProvider)
.addNativeDeclaredProvider(templateVariableInfo)
.setFilesToBuild(ccToolchainProvider.getAllFilesIncludingLibc())
.addProvider(RunfilesProvider.simple(ruleContext, Runfiles.EMPTY));
if (ccToolchainProvider.getLicensesProvider() != null) {
builder.add(LicensesProvider.class, ccToolchainProvider.getLicensesProvider());
}
return builder.build();
}
private <T extends HasCcToolchainLabel> T selectCcToolchain(
BuiltinProvider<T> providerType,
RuleContext ruleContext,
String cpu,
String compiler,
Label selectedCcToolchain)
throws RuleErrorException {
T selectedAttributes = null;
for (TransitiveInfoCollection dep : ruleContext.getPrerequisiteMap("toolchains").values()) {
T attributes = dep.get(providerType);
if (attributes != null && attributes.getCcToolchainLabel().equals(selectedCcToolchain)) {
selectedAttributes = attributes;
break;
}
}
if (selectedAttributes != null) {
return selectedAttributes;
}
String errorMessage =
String.format(
"cc_toolchain_suite '%s' does not contain a toolchain for cpu '%s'",
ruleContext.getLabel(), cpu);
if (compiler != null) {
errorMessage = errorMessage + " and compiler '" + compiler + "'.";
}
ruleContext.throwWithRuleError(errorMessage);
throw new IllegalStateException("Should not be reached");
}
}