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Add toolchain resolution via late-bound-labels.
Part of bazelbuild#2219. Experimental, DO NOT SUBMIT. Change-Id: I101bb9fbaab0debb20b9bc07fca3b0dc4b9ff66b
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src/main/java/com/google/devtools/build/lib/analysis/ToolchainResolver.java
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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.analysis; | ||
|
|
||
| import com.google.common.base.Function; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import com.google.common.collect.Iterables; | ||
| import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode; | ||
| import com.google.devtools.build.lib.analysis.platform.PlatformInfo; | ||
| import com.google.devtools.build.lib.analysis.platform.ToolchainInfo; | ||
| import com.google.devtools.build.lib.packages.SkylarkExportable; | ||
| import com.google.devtools.build.lib.syntax.SkylarkDict; | ||
| import com.google.devtools.build.lib.util.Preconditions; | ||
| import java.util.List; | ||
| import javax.annotation.Nullable; | ||
|
|
||
| /** | ||
| * Implements toolchain resolution depending on the configuration and the target's requested | ||
| * toolchains. | ||
| */ | ||
| public class ToolchainResolver { | ||
| //private ImmutableMap<SkylarkExportable, ToolchainInfo> toolchains; | ||
| private final RuleContext ruleContext; | ||
| private final ImmutableList<SkylarkExportable> requiredToolchains; | ||
|
|
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| public ToolchainResolver(RuleContext ruleContext, | ||
| ImmutableList<SkylarkExportable> requiredToolchains) { | ||
| this.ruleContext = ruleContext; | ||
| this.requiredToolchains = requiredToolchains; | ||
| } | ||
|
|
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| public SkylarkDict<SkylarkExportable, ToolchainInfo> collectToolchains() { | ||
| ImmutableMap<SkylarkExportable, ToolchainInfo> toolchains = resolveToolchains(); | ||
| return SkylarkDict.<SkylarkExportable, ToolchainInfo>copyOf(null, toolchains); | ||
| } | ||
|
|
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| private ImmutableMap<SkylarkExportable,ToolchainInfo> resolveToolchains() { | ||
| if (requiredToolchains.isEmpty()) { | ||
| return ImmutableMap.of(); | ||
| } | ||
|
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| PlatformInfo targetPlatform = platform(ruleContext.getPrerequisite(":target_platform", Mode.DONT_CHECK)); | ||
| PlatformInfo execPlatform = platform(ruleContext.getPrerequisite(":exec_platform", Mode.DONT_CHECK)); | ||
| List<ToolchainInfo> toolchains = toolchains(ruleContext.getPrerequisites(":toolchains", Mode.DONT_CHECK)); | ||
|
|
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| ImmutableMap.Builder<SkylarkExportable,ToolchainInfo> builder = new ImmutableMap.Builder<>(); | ||
| for (SkylarkExportable toolchainSymbol : requiredToolchains) { | ||
| ToolchainInfo toolchain = resolveToolchain(toolchainSymbol, toolchains); | ||
| if (toolchain != null) { | ||
| builder.put(toolchainSymbol, toolchain); | ||
| } | ||
| } | ||
|
|
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| return builder.build(); | ||
| } | ||
|
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| @Nullable | ||
| private static ToolchainInfo resolveToolchain( | ||
| SkylarkExportable toolchainSymbol, | ||
| List<ToolchainInfo> toolchains) { | ||
|
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| // TODO(https://github.com/bazelbuild/bazel/issues/2219): Implement actual resolution. | ||
| /* | ||
| for (ToolchainInfo toolchain : toolchains) { | ||
| toolchain.toString(); | ||
| // check if the toolchain matches the requested symbol. | ||
| } | ||
| */ | ||
| return toolchains.get(0); | ||
|
|
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| //return null; | ||
| } | ||
|
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| public static PlatformInfo platform(TransitiveInfoCollection target) { | ||
| Object provider = target.get(PlatformInfo.SKYLARK_IDENTIFIER); | ||
| if (provider == null) { | ||
| return null; | ||
| } | ||
| Preconditions.checkState(provider instanceof PlatformInfo); | ||
| return (PlatformInfo) provider; | ||
| } | ||
|
|
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| public static ToolchainInfo toolchain(TransitiveInfoCollection target) { | ||
| Object provider = target.get(ToolchainInfo.SKYLARK_IDENTIFIER); | ||
| if (provider == null) { | ||
| return null; | ||
| } | ||
| Preconditions.checkState(provider instanceof ToolchainInfo); | ||
| return (ToolchainInfo) provider; | ||
| } | ||
|
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| public static List<ToolchainInfo> toolchains( | ||
| Iterable<? extends TransitiveInfoCollection> targets) { | ||
| return ImmutableList.copyOf(Iterables.transform( | ||
| targets, | ||
| new Function<TransitiveInfoCollection, ToolchainInfo>() { | ||
| @Override | ||
| public ToolchainInfo apply(TransitiveInfoCollection target) { | ||
| return toolchain(target); | ||
| } | ||
| })); | ||
| } | ||
| } |
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