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// Copyright 2015 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.apple;
import static com.google.devtools.build.lib.syntax.Type.BOOLEAN;
import com.google.common.base.Joiner;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.rules.apple.AppleCommandLineOptions.AppleBitcodeMode;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Implementation for the {@code xcode_config} rule.
*/
public class XcodeConfig implements RuleConfiguredTargetFactory {
private static final DottedVersion MINIMUM_BITCODE_XCODE_VERSION = DottedVersion.fromString("7");
@Override
public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedException {
AppleConfiguration configuration = ruleContext.getFragment(AppleConfiguration.class);
Optional<DottedVersion> versionOverrideFlag = configuration.getXcodeVersionOverrideFlag();
DottedVersion targetVersion = resolveExplicitlyDefinedVersion(ruleContext);
XcodeConfigProvider xcodeConfigProvider;
if (targetVersion == null) {
if (versionOverrideFlag.isPresent()) {
xcodeConfigProvider = new XcodeConfigProvider(versionOverrideFlag.get());
} else {
xcodeConfigProvider = XcodeConfigProvider.hostSystemDefault();
}
} else {
xcodeConfigProvider = new XcodeConfigProvider(targetVersion);
}
validateXcodeConfig(ruleContext, configuration, xcodeConfigProvider);
return new RuleConfiguredTargetBuilder(ruleContext)
.addProvider(RunfilesProvider.class, RunfilesProvider.EMPTY)
.addProvider(XcodeConfigProvider.class, xcodeConfigProvider)
.build();
}
private void validateXcodeConfig(RuleContext ruleContext, AppleConfiguration config,
XcodeConfigProvider xcodeConfigProvider) {
Optional<DottedVersion> xcodeVersion = xcodeConfigProvider.getXcodeVersion();
if (config.getBitcodeMode() != AppleBitcodeMode.NONE
&& xcodeVersion.isPresent()
&& xcodeVersion.get().compareTo(MINIMUM_BITCODE_XCODE_VERSION) < 0) {
ruleContext.ruleError(
String.format("apple_bitcode mode '%s' is unsupported for xcode version '%s'",
config.getBitcodeMode(), xcodeVersion.get()));
}
}
/**
* Returns the xcode version number corresponding to the {@code --xcode_version} flag, if there
* is an available {@code xcode_version} target which recognizes the flag value as either
* an official version or an alias. Returns null if no such target is found.
*/
@Nullable private DottedVersion resolveExplicitlyDefinedVersion(RuleContext ruleContext) {
AppleConfiguration configuration = ruleContext.getFragment(AppleConfiguration.class);
Optional<DottedVersion> versionOverrideFlag = configuration.getXcodeVersionOverrideFlag();
if (versionOverrideFlag.isPresent()) {
// The version override flag is not necessarily an actual version - it may be a version
// alias.
DottedVersion explicitVerison =
aliasesToVersionMap(ruleContext).get(versionOverrideFlag.get().toString());
if (explicitVerison != null) {
return explicitVerison;
}
} else { // No override specified. Use default.
XcodeVersionProvider defaultProvider = ruleContext.getPrerequisite(
XcodeConfigRule.DEFAULT_ATTR_NAME, Mode.TARGET, XcodeVersionProvider.class);
if (defaultProvider != null) {
return defaultProvider.getVersion();
}
}
boolean requireDefinedVersions = ruleContext.attributes().get(
XcodeConfigRule.REQUIRE_DEFINED_VERSIONS_ATTR_NAME, BOOLEAN);
if (requireDefinedVersions) {
ruleContext.ruleError(
"xcode version config required an explicitly defined version, but none was available");
}
return null;
}
private static Map<String, DottedVersion> aliasesToVersionMap(RuleContext ruleContext) {
Iterable<XcodeVersionProvider> xcodeVersionProviders =
ruleContext.getPrerequisites(XcodeConfigRule.VERSIONS_ATTR_NAME, Mode.TARGET,
XcodeVersionProvider.class);
Map<String, DottedVersion> aliasesToVersionMap = Maps.newLinkedHashMap();
for (XcodeVersionProvider versionProvider : xcodeVersionProviders) {
for (String alias : versionProvider.getAliases()) {
if (aliasesToVersionMap.put(alias, versionProvider.getVersion()) != null) {
ruleErrorDuplicateAlias(alias, ruleContext);
}
}
if (aliasesToVersionMap.put(
versionProvider.getVersion().toString(), versionProvider.getVersion()) != null) {
ruleErrorDuplicateAlias(versionProvider.getVersion().toString(), ruleContext);
}
}
return aliasesToVersionMap;
}
private static void ruleErrorDuplicateAlias(String alias, RuleContext ruleContext) {
Iterable<XcodeVersionProvider> xcodeVersionProviders =
ruleContext.getPrerequisites(XcodeConfigRule.VERSIONS_ATTR_NAME, Mode.TARGET,
XcodeVersionProvider.class);
ImmutableList.Builder<Label> labelsContainingAlias = ImmutableList.builder();
for (XcodeVersionProvider versionProvider : xcodeVersionProviders) {
if (versionProvider.getAliases().contains(alias)
|| versionProvider.getVersion().toString().equals(alias)) {
labelsContainingAlias.add(versionProvider.getLabel());
}
}
ruleContext.ruleError(String.format(
"'%s' is registered to multiple labels (%s) in a single xcode version "
+ "configuration", alias, Joiner.on(", ").join(labelsContainingAlias.build())));
}
}
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