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Extract a separate StarlarkToolchainContext for starlark-only operati…
…ons. Also make ToolchainContextApi use starlark threads. PiperOrigin-RevId: 367515900
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src/main/java/com/google/devtools/build/lib/analysis/starlark/StarlarkToolchainContext.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // Copyright 2021 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.starlark; | ||
|
|
||
| import static java.util.stream.Collectors.joining; | ||
|
|
||
| import com.google.auto.value.AutoValue; | ||
| import com.google.devtools.build.lib.analysis.ResolvedToolchainContext; | ||
| import com.google.devtools.build.lib.analysis.platform.ToolchainInfo; | ||
| import com.google.devtools.build.lib.analysis.platform.ToolchainTypeInfo; | ||
| import com.google.devtools.build.lib.cmdline.Label; | ||
| import com.google.devtools.build.lib.cmdline.LabelSyntaxException; | ||
| import com.google.devtools.build.lib.starlarkbuildapi.platform.ToolchainContextApi; | ||
| import javax.annotation.Nullable; | ||
| import net.starlark.java.eval.EvalException; | ||
| import net.starlark.java.eval.Printer; | ||
| import net.starlark.java.eval.Starlark; | ||
| import net.starlark.java.eval.StarlarkSemantics; | ||
| import net.starlark.java.eval.StarlarkThread; | ||
|
|
||
| /** | ||
| * An implementation of ToolchainContextApi that can better handle converting strings into Labels. | ||
| */ | ||
| @AutoValue | ||
| public abstract class StarlarkToolchainContext implements ToolchainContextApi { | ||
|
|
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| private static final ToolchainContextApi NO_OP = | ||
| new ToolchainContextApi() { | ||
| @Override | ||
| public Object getIndex( | ||
| StarlarkThread starlarkThread, StarlarkSemantics semantics, Object key) { | ||
| // TODO(jcater): throw Starlark.errorf instead of returning NONE. | ||
| return Starlark.NONE; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean containsKey( | ||
| StarlarkThread starlarkThread, StarlarkSemantics semantics, Object key) { | ||
| return false; | ||
| } | ||
| }; | ||
|
|
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| public static ToolchainContextApi create(@Nullable ResolvedToolchainContext toolchainContext) { | ||
| if (toolchainContext == null) { | ||
| return NO_OP; | ||
| } | ||
|
|
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| return new AutoValue_StarlarkToolchainContext(toolchainContext); | ||
| } | ||
|
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| protected abstract ResolvedToolchainContext toolchainContext(); | ||
|
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| @Override | ||
| public boolean isImmutable() { | ||
| return true; | ||
| } | ||
|
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| @Override | ||
| public void repr(Printer printer) { | ||
| printer.append("<toolchain_context.resolved_labels: "); | ||
| printer.append( | ||
| toolchainContext().toolchains().keySet().stream() | ||
| .map(ToolchainTypeInfo::typeLabel) | ||
| .map(Label::toString) | ||
| .collect(joining(", "))); | ||
| printer.append(">"); | ||
| } | ||
|
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| private Label transformKey(StarlarkThread starlarkThread, Object key) throws EvalException { | ||
| if (key instanceof Label) { | ||
| return (Label) key; | ||
| } else if (key instanceof ToolchainTypeInfo) { | ||
| return ((ToolchainTypeInfo) key).typeLabel(); | ||
| } else if (key instanceof String) { | ||
| try { | ||
| // TODO(jcater): Use LabelConversionContext and StarlarkThread to convert this instead. | ||
| // Also remove repoMapping from ResolvedToolchainContext. | ||
| return Label.parseAbsolute((String) key, toolchainContext().repoMapping()); | ||
| } catch (LabelSyntaxException e) { | ||
| throw Starlark.errorf("Unable to parse toolchain label '%s': %s", key, e.getMessage()); | ||
| } | ||
| } else { | ||
| throw Starlark.errorf( | ||
| "Toolchains only supports indexing by toolchain type, got %s instead", | ||
| Starlark.type(key)); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public ToolchainInfo getIndex( | ||
| StarlarkThread starlarkThread, StarlarkSemantics semantics, Object key) throws EvalException { | ||
| Label toolchainTypeLabel = transformKey(starlarkThread, key); | ||
|
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| if (!containsKey(starlarkThread, semantics, key)) { | ||
| // TODO(bazel-configurability): The list of available toolchain types is confusing in the | ||
| // presence of aliases, since it only contains the actual label, not the alias passed to the | ||
| // rule definition. | ||
| throw Starlark.errorf( | ||
| "In %s, toolchain type %s was requested but only types [%s] are configured", | ||
| toolchainContext().targetDescription(), | ||
| toolchainTypeLabel, | ||
| toolchainContext().requiredToolchainTypes().stream() | ||
| .map(ToolchainTypeInfo::typeLabel) | ||
| .map(Label::toString) | ||
| .collect(joining(", "))); | ||
| } | ||
| return toolchainContext().forToolchainType(toolchainTypeLabel); | ||
| } | ||
|
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||
| @Override | ||
| public boolean containsKey(StarlarkThread starlarkThread, StarlarkSemantics semantics, Object key) | ||
| throws EvalException { | ||
| Label toolchainTypeLabel = transformKey(starlarkThread, key); | ||
| return toolchainContext().requestedToolchainTypeLabels().containsKey(toolchainTypeLabel); | ||
| } | ||
| } |
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