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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;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.PlatformConfiguration;
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.ToolchainContext.ResolvedToolchainProviders;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Options;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Options.MakeVariableSource;
import com.google.devtools.build.lib.analysis.platform.ToolchainInfo;
import com.google.devtools.build.lib.cmdline.Label;
import java.util.TreeMap;
/**
* Abstract base class for {@code toolchain_type}.
*/
public class ToolchainType implements RuleConfiguredTargetFactory {
private ImmutableMap<Label, Class<? extends BuildConfiguration.Fragment>> fragmentMap;
private final Function<RuleContext, ImmutableMap<Label, Class<? extends Fragment>>>
fragmentMapFromRuleContext;
private final ImmutableMap<Label, ImmutableMap<String, String>> hardcodedVariableMap;
protected ToolchainType(
ImmutableMap<Label, Class<? extends BuildConfiguration.Fragment>> fragmentMap,
ImmutableMap<Label, ImmutableMap<String, String>> hardcodedVariableMap) {
this.fragmentMap = fragmentMap;
this.fragmentMapFromRuleContext = null;
this.hardcodedVariableMap = hardcodedVariableMap;
}
// This constructor is required to allow for toolchains that depend on the tools repository,
// which depends on RuleContext.
protected ToolchainType(
Function<RuleContext, ImmutableMap<Label, Class<? extends Fragment>>>
fragmentMapFromRuleContext,
ImmutableMap<Label, ImmutableMap<String, String>> hardcodedVariableMap) {
this.fragmentMap = null;
this.fragmentMapFromRuleContext = fragmentMapFromRuleContext;
this.hardcodedVariableMap = hardcodedVariableMap;
}
@Override
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException, ActionConflictException {
if (fragmentMap == null && fragmentMapFromRuleContext != null) {
this.fragmentMap = fragmentMapFromRuleContext.apply(ruleContext);
}
// This cannot be an ImmutableMap.Builder because that asserts when a key is duplicated
TreeMap<String, String> makeVariables = new TreeMap<>();
ImmutableMap.Builder<String, String> fragmentBuilder = ImmutableMap.builder();
// If this toolchain type is enabled, we can derive make variables from it. Otherwise, we
// derive make variables from the corresponding configuration fragment.
if (ruleContext.getConfiguration().getOptions().get(Options.class).makeVariableSource
== MakeVariableSource.TOOLCHAIN
&& ruleContext
.getFragment(PlatformConfiguration.class)
.isToolchainTypeEnabled(ruleContext.getLabel())) {
ResolvedToolchainProviders providers =
(ResolvedToolchainProviders)
ruleContext.getToolchainContext().getResolvedToolchainProviders();
ToolchainInfo toolchainInfo = providers.getForToolchainType(ruleContext.getLabel());
if (toolchainInfo != null) {
toolchainInfo.addGlobalMakeVariables(fragmentBuilder);
}
} else {
Class<? extends BuildConfiguration.Fragment> fragmentClass =
fragmentMap.get(ruleContext.getLabel());
if (fragmentClass != null) {
BuildConfiguration.Fragment fragment = ruleContext.getFragment(fragmentClass);
fragment.addGlobalMakeVariables(fragmentBuilder);
}
}
makeVariables.putAll(fragmentBuilder.build());
ImmutableMap<String, String> hardcodedVariables =
hardcodedVariableMap.get(ruleContext.getLabel());
if (hardcodedVariables != null) {
makeVariables.putAll(hardcodedVariables);
}
// This will eventually go to Skyframe using getAnalysisEnvironment.getSkyframeEnv() to figure
// out the lookup rule -> toolchain rule mapping. For now, it only provides Make variables that
// come from BuildConfiguration so no need to ask Skyframe.
return new RuleConfiguredTargetBuilder(ruleContext)
.addNativeDeclaredProvider(new TemplateVariableInfo(
ImmutableMap.copyOf(makeVariables), ruleContext.getRule().getLocation()))
.addProvider(RunfilesProvider.simple(Runfiles.EMPTY))
.build();
}
}
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