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// Copyright 2014 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.java;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.RedirectChaser;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigurationEnvironment;
import com.google.devtools.build.lib.analysis.config.ConfigurationFragmentFactory;
import com.google.devtools.build.lib.analysis.config.FragmentOptions;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.NoSuchThingException;
import com.google.devtools.build.lib.packages.RawAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A provider to load jvm configurations from the package path.
*
* <p>If the given {@code javaHome} is a label, i.e. starts with {@code "//"}, then the loader will
* look at the {@code java_runtime_suite} it refers to, and select the runtime from the entry in
* {@code java_runtime_suite.runtimes} for {@code cpu}.
*
* <p>The loader also supports legacy mode, where the JVM can be defined with an abolute path.
*/
public final class JvmConfigurationLoader implements ConfigurationFragmentFactory {
@Override
public Jvm create(ConfigurationEnvironment env, BuildOptions buildOptions)
throws InvalidConfigurationException, InterruptedException {
JavaOptions javaOptions = buildOptions.get(JavaOptions.class);
if (javaOptions.disableJvm) {
// TODO(bazel-team): Instead of returning null here, add another method to the interface.
return null;
}
String javaHome = javaOptions.javaBase;
String cpu = buildOptions.get(BuildConfiguration.Options.class).cpu;
try {
return createDefault(env, javaHome, cpu);
} catch (LabelSyntaxException e) {
// Try again with legacy
}
return createLegacy(javaHome);
}
@Override
public Class<? extends Fragment> creates() {
return Jvm.class;
}
@Override
public ImmutableSet<Class<? extends FragmentOptions>> requiredOptions() {
return ImmutableSet.<Class<? extends FragmentOptions>>of(JavaOptions.class);
}
@Nullable
private static Jvm createDefault(ConfigurationEnvironment lookup, String javaHome, String cpu)
throws InvalidConfigurationException, LabelSyntaxException, InterruptedException {
try {
Label label = Label.parseAbsolute(javaHome);
label = RedirectChaser.followRedirects(lookup, label, "jdk");
if (label == null) {
return null;
}
Target javaHomeTarget = lookup.getTarget(label);
if (javaHomeTarget instanceof Rule) {
if (!((Rule) javaHomeTarget).getRuleClass().equals("java_runtime_suite")) {
throw new InvalidConfigurationException(
"Unexpected javabase rule kind '" + ((Rule) javaHomeTarget).getRuleClass() + "'");
}
return createFromRuntimeSuite(lookup, (Rule) javaHomeTarget, cpu);
}
throw new InvalidConfigurationException(
"No JVM target found under " + javaHome + " that would work for " + cpu);
} catch (NoSuchThingException e) {
lookup.getEventHandler().handle(Event.error(e.getMessage()));
throw new InvalidConfigurationException(e.getMessage(), e);
}
}
// TODO(b/34175492): eventually the Jvm fragement will containg only the label of a java_runtime
// rule, and all of the configuration will be accessed using JavaRuntimeProvider.
private static Jvm createFromRuntimeSuite(
ConfigurationEnvironment lookup, Rule javaRuntimeSuite, String cpu)
throws InvalidConfigurationException, InterruptedException, NoSuchTargetException,
NoSuchPackageException {
Label javaRuntimeLabel = selectRuntime(javaRuntimeSuite, cpu);
Target javaRuntimeTarget = lookup.getTarget(javaRuntimeLabel);
if (javaRuntimeTarget == null) {
return null;
}
if (!(javaRuntimeTarget instanceof Rule)) {
throw new InvalidConfigurationException(
String.format("Invalid java_runtime '%s'", javaRuntimeLabel));
}
Rule javaRuntimeRule = (Rule) javaRuntimeTarget;
if (!javaRuntimeRule.getRuleClass().equals("java_runtime")) {
throw new InvalidConfigurationException(
String.format("Expected a java_runtime rule, was '%s'", javaRuntimeRule.getRuleClass()));
}
RawAttributeMapper attributes = RawAttributeMapper.of(javaRuntimeRule);
PathFragment javaHomePath = defaultJavaHome(javaRuntimeLabel);
if (attributes.isAttributeValueExplicitlySpecified("java_home")) {
javaHomePath = javaHomePath.getRelative(attributes.get("java_home", Type.STRING));
}
return new Jvm(javaHomePath, javaRuntimeLabel);
}
private static Label selectRuntime(Rule javaRuntimeSuite, String cpu)
throws InvalidConfigurationException {
RawAttributeMapper suiteAttributes = RawAttributeMapper.of(javaRuntimeSuite);
Map<String, Label> runtimes = suiteAttributes.get("runtimes", BuildType.LABEL_DICT_UNARY);
if (runtimes.containsKey(cpu)) {
return runtimes.get(cpu);
}
if (suiteAttributes.isAttributeValueExplicitlySpecified("default")) {
return suiteAttributes.get("default", BuildType.LABEL);
}
throw new InvalidConfigurationException(
"No JVM target found under " + javaRuntimeSuite + " that would work for " + cpu);
}
private static PathFragment defaultJavaHome(Label javaBase) {
if (javaBase.getPackageIdentifier().getRepository().isDefault()) {
return javaBase.getPackageFragment();
}
return javaBase.getPackageIdentifier().getSourceRoot();
}
private static Jvm createLegacy(String javaHome) throws InvalidConfigurationException {
PathFragment javaHomePathFrag = PathFragment.create(javaHome);
if (!javaHomePathFrag.isAbsolute()) {
throw new InvalidConfigurationException(
"Illegal javabase value '" + javaHome + "', javabase must be an absolute path or label");
}
return new Jvm(javaHomePathFrag, null);
}
}
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