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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 static java.util.stream.Collectors.joining;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.platform.PlatformProviderUtils;
import com.google.devtools.build.lib.analysis.platform.ToolchainInfo;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory;
import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter;
import com.google.devtools.build.lib.skylarkinterface.SkylarkValue;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.EvalUtils;
import com.google.devtools.build.lib.syntax.SkylarkIndexable;
import com.google.devtools.build.lib.util.OrderedSetMultimap;
import com.google.devtools.build.lib.util.Preconditions;
import java.util.List;
import java.util.Optional;
import javax.annotation.Nullable;
/** Contains toolchain-related information needed for a {@link RuleContext}. */
@Immutable
@ThreadSafe
@SkylarkModule(
name = "ToolchainContext",
category = SkylarkModuleCategory.BUILTIN,
doc = "Stores toolchains available to a given rule."
)
public class ToolchainContext {
public static ToolchainContext create(
List<Label> requiredToolchains, ImmutableBiMap<Label, Label> resolvedLabels) {
ToolchainContext toolchainContext =
new ToolchainContext(requiredToolchains, new ResolvedToolchainLabels(resolvedLabels));
return toolchainContext;
}
private final ImmutableList<Label> requiredToolchains;
// Map from toolchain type labels to actual resolved toolchain labels.
private final ResolvedToolchainLabels resolvedToolchainLabels;
// Stores the actual ToolchainInfo provider for each toolchain type.
private ResolvedToolchainProviders resolvedToolchainProviders =
ResolvedToolchainProviders.empty();
private ToolchainContext(
List<Label> requiredToolchains, ResolvedToolchainLabels resolvedToolchainLabels) {
this.requiredToolchains = ImmutableList.copyOf(requiredToolchains);
this.resolvedToolchainLabels = resolvedToolchainLabels;
}
public void resolveToolchains(OrderedSetMultimap<Attribute, ConfiguredTarget> prerequisiteMap) {
if (!this.requiredToolchains.isEmpty()) {
this.resolvedToolchainProviders =
ResolvedToolchainProviders.create(resolvedToolchainLabels, prerequisiteMap);
}
}
@Nullable
public SkylarkIndexable getResolvedToolchainProviders() {
return resolvedToolchainProviders;
}
public ImmutableSet<Label> getResolvedToolchainLabels() {
return resolvedToolchainLabels.getToolchainLabels();
}
/** Tracks the mapping from toolchain type label to the label of the actual resolved toolchain. */
private static class ResolvedToolchainLabels {
private final ImmutableBiMap<Label, Label> toolchainLabels;
private ResolvedToolchainLabels(ImmutableBiMap<Label, Label> toolchainLabels) {
this.toolchainLabels = toolchainLabels;
}
public Label getType(Label toolchainLabel) {
return toolchainLabels.inverse().get(toolchainLabel);
}
public Label getResolvedToolchainLabel(Label toolchainType) {
return toolchainLabels.get(toolchainType);
}
public ImmutableSet<Label> getToolchainLabels() {
return toolchainLabels.values();
}
}
/** Tracks the mapping from toolchain type label to {@link ToolchainInfo} provider. */
private static class ResolvedToolchainProviders implements SkylarkValue, SkylarkIndexable {
private static ResolvedToolchainProviders empty() {
return new ResolvedToolchainProviders(ImmutableMap.<Label, ToolchainInfo>of());
}
private static ResolvedToolchainProviders create(
ResolvedToolchainLabels resolvedToolchainLabels,
OrderedSetMultimap<Attribute, ConfiguredTarget> prerequisiteMap) {
// Find the prerequisites associated with the $toolchains attribute.
Optional<Attribute> toolchainAttribute =
prerequisiteMap
.keys()
.stream()
.filter(attribute -> attribute.getName().equals(PlatformSemantics.TOOLCHAINS_ATTR))
.findFirst();
Preconditions.checkState(
toolchainAttribute.isPresent(),
"No toolchains attribute found while loading resolved toolchains");
ImmutableMap.Builder<Label, ToolchainInfo> toolchains = new ImmutableMap.Builder<>();
for (ConfiguredTarget target : prerequisiteMap.get(toolchainAttribute.get())) {
Label discoveredLabel = target.getLabel();
Label toolchainType = resolvedToolchainLabels.getType(discoveredLabel);
if (toolchainType != null) {
ToolchainInfo toolchainInfo = PlatformProviderUtils.toolchain(target);
toolchains.put(toolchainType, toolchainInfo);
}
}
return new ResolvedToolchainProviders(toolchains.build());
}
private final ImmutableMap<Label, ToolchainInfo> toolchains;
private ResolvedToolchainProviders(ImmutableMap<Label, ToolchainInfo> toolchains) {
this.toolchains = toolchains;
}
@Override
public boolean isImmutable() {
return true;
}
@Override
public void repr(SkylarkPrinter printer) {
printer.append("<toolchain_context.resolved_labels: ");
printer.append(toolchains.keySet().stream()
.map(key -> key.toString())
.collect(joining(", ")));
printer.append(">");
}
private Label transformKey(Object key, Location loc) throws EvalException {
if (key instanceof Label) {
Label toolchainType = (Label) key;
return toolchainType;
} else if (key instanceof String) {
Label toolchainType = null;
String rawLabel = (String) key;
try {
toolchainType = Label.parseAbsolute(rawLabel);
} catch (LabelSyntaxException e) {
throw new EvalException(
loc, String.format("Unable to parse toolchain %s: %s", rawLabel, e.getMessage()), e);
}
return toolchainType;
} else {
throw new EvalException(
loc,
String.format(
"Toolchains only supports indexing by toolchain type, got %s instead",
EvalUtils.getDataTypeName(key)));
}
}
@Override
public ToolchainInfo getIndex(Object key, Location loc) throws EvalException {
Label toolchainType = transformKey(key, loc);
return toolchains.get(toolchainType);
}
@Override
public boolean containsKey(Object key, Location loc) throws EvalException {
Label toolchainType = transformKey(key, loc);
return toolchains.containsKey(toolchainType);
}
}
}
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