| // 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.platform; |
| |
| import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException; |
| import com.google.devtools.build.lib.analysis.ConfiguredTarget; |
| import com.google.devtools.build.lib.analysis.FileProvider; |
| import com.google.devtools.build.lib.analysis.FilesToRunProvider; |
| 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.RunfilesProvider; |
| import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode; |
| import com.google.devtools.build.lib.analysis.platform.ConstraintValueInfo; |
| import com.google.devtools.build.lib.analysis.platform.DeclaredToolchainInfo; |
| import com.google.devtools.build.lib.analysis.platform.PlatformProviderUtils; |
| import com.google.devtools.build.lib.analysis.platform.ToolchainTypeInfo; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.packages.BuildType; |
| |
| /** Defines a toolchain that can be used by rules. */ |
| public class Toolchain implements RuleConfiguredTargetFactory { |
| |
| @Override |
| public ConfiguredTarget create(RuleContext ruleContext) |
| throws InterruptedException, RuleErrorException, ActionConflictException { |
| |
| ToolchainTypeInfo toolchainType = |
| PlatformProviderUtils.toolchainType( |
| ruleContext.getPrerequisite(ToolchainRule.TOOLCHAIN_TYPE_ATTR, Mode.DONT_CHECK)); |
| Iterable<ConstraintValueInfo> execConstraints = |
| PlatformProviderUtils.constraintValues( |
| ruleContext.getPrerequisites(ToolchainRule.EXEC_COMPATIBLE_WITH_ATTR, Mode.DONT_CHECK)); |
| Iterable<ConstraintValueInfo> targetConstraints = |
| PlatformProviderUtils.constraintValues( |
| ruleContext.getPrerequisites( |
| ToolchainRule.TARGET_COMPATIBLE_WITH_ATTR, Mode.DONT_CHECK)); |
| Label toolchainLabel = |
| ruleContext.attributes().get(ToolchainRule.TOOLCHAIN_ATTR, BuildType.NODEP_LABEL); |
| |
| DeclaredToolchainInfo registeredToolchain; |
| try { |
| registeredToolchain = |
| DeclaredToolchainInfo.builder() |
| .toolchainType(toolchainType) |
| .addExecConstraints(execConstraints) |
| .addTargetConstraints(targetConstraints) |
| .toolchainLabel(toolchainLabel) |
| .build(); |
| } catch (DeclaredToolchainInfo.DuplicateConstraintException e) { |
| if (e.execConstraintsException() != null) { |
| ruleContext.attributeError( |
| ToolchainRule.EXEC_COMPATIBLE_WITH_ATTR, e.execConstraintsException().getMessage()); |
| } |
| if (e.targetConstraintsException() != null) { |
| ruleContext.attributeError( |
| ToolchainRule.TARGET_COMPATIBLE_WITH_ATTR, e.targetConstraintsException().getMessage()); |
| } |
| // One of the above must have been non-null, so we just return early. |
| return null; |
| } |
| |
| return new RuleConfiguredTargetBuilder(ruleContext) |
| .addProvider(RunfilesProvider.class, RunfilesProvider.EMPTY) |
| .addProvider(FileProvider.class, FileProvider.EMPTY) |
| .addProvider(FilesToRunProvider.class, FilesToRunProvider.EMPTY) |
| .addProvider(registeredToolchain) |
| .build(); |
| } |
| } |