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Rollforward of bazelbuild@7f6e649: Add support for path mapping to `C…
…ppArchive` This mostly requires wiring up the existing machinery for structured variables and (most) link build variables. Utility methods on `PathMappers` are moved to `PathMapper` so that they can be dependend on by `AbstractCommandLine` without creating a cycle. NEW: - Allow toolchain variables to be None and skip them in that case, matching the previous behavior. - Use the effective output paths mode for fingerprinting to preserve action cache entries for non-path mapped actions even when path mapping is generally enabled. Closes bazelbuild#25154. PiperOrigin-RevId: 721850758 Change-Id: I34a66006ba4c8fd73d62ce8cea249577f62a1b02
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src/main/java/com/google/devtools/build/lib/actions/PathMapperConstants.java
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| // Copyright 2025 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. | ||
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| package com.google.devtools.build.lib.actions; | ||
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| import com.github.benmanes.caffeine.cache.Caffeine; | ||
| import com.github.benmanes.caffeine.cache.LoadingCache; | ||
| import com.google.devtools.build.lib.vfs.PathFragment; | ||
| import net.starlark.java.eval.StarlarkSemantics; | ||
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| /** Holder class for symbols used by the PathMapper interface that shouldn't be public. */ | ||
| final class PathMapperConstants { | ||
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| public static final StarlarkSemantics.Key<PathMapper> SEMANTICS_KEY = | ||
| new StarlarkSemantics.Key<>("path_mapper", PathMapper.NOOP); | ||
| public static final LoadingCache<ArtifactRoot, PathMapper.MappedArtifactRoot> mappedSourceRoots = | ||
| Caffeine.newBuilder() | ||
| .weakKeys() | ||
| .build(sourceRoot -> new PathMapper.MappedArtifactRoot(sourceRoot.getExecPath())); | ||
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| private static final PathFragment BAZEL_OUT = PathFragment.create("bazel-out"); | ||
| private static final PathFragment BLAZE_OUT = PathFragment.create("blaze-out"); | ||
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| /** | ||
| * A special instance for use in {@link AbstractAction#computeKey} when path mapping is generally | ||
| * enabled for an action. | ||
| * | ||
| * <p>When computing an action key, the following approaches to taking path mapping into account | ||
| * do <b>not</b> work: | ||
| * | ||
| * <ul> | ||
| * <li>Using the actual path mapper is prohibitive since constructing it requires checking for | ||
| * collisions among the action input's paths when computing the action key, which flattens | ||
| * the input depsets of all actions that opt into path mapping and also increases CPU usage. | ||
| * <li>Unconditionally using {@link | ||
| * com.google.devtools.build.lib.analysis.actions.StrippingPathMapper} can result in stale | ||
| * action keys when an action is opted out of path mapping at execution time due to input | ||
| * path collisions after stripping. See path_mapping_test for an example. | ||
| * <li>Using {@link PathMapper#NOOP} does not distinguish between map_each results built from | ||
| * strings and those built from {@link | ||
| * com.google.devtools.build.lib.starlarkbuildapi.FileApi#getExecPathStringForStarlark}. | ||
| * While the latter will be mapped at execution time, the former won't, resulting in the | ||
| * same digest for actions that behave differently at execution time. This is covered by | ||
| * tests in StarlarkRuleImplementationFunctionsTest. | ||
| * </ul> | ||
| * | ||
| * <p>Instead, we use a special path mapping instance that preserves the equality relations | ||
| * between the original config segments, but prepends a fixed string to distinguish hard-coded | ||
| * path strings from mapped paths. This relies on actions using path mapping to be "root | ||
| * agnostic": they must not contain logic that depends on any particular (output) root path. | ||
| */ | ||
| static final PathMapper FOR_FINGERPRINTING = | ||
| execPath -> { | ||
| if (!execPath.startsWith(BAZEL_OUT) && !execPath.startsWith(BLAZE_OUT)) { | ||
| // This is not an output path. | ||
| return execPath; | ||
| } | ||
| String execPathString = execPath.getPathString(); | ||
| int startOfConfigSegment = execPathString.indexOf('/') + 1; | ||
| if (startOfConfigSegment == 0) { | ||
| return execPath; | ||
| } | ||
| return PathFragment.createAlreadyNormalized( | ||
| execPathString.substring(0, startOfConfigSegment) | ||
| + "pm-" | ||
| + execPathString.substring(startOfConfigSegment)); | ||
| }; | ||
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| private PathMapperConstants() {} | ||
| } |
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