Google Git
Sign in
bazel / bazel / fa388c30760b40021d94fb3e7a44b70c09f8456d / . / src / main / java / com / google / devtools / build / lib / packages / Package.java
blob: 6048ca6da9ba0ae500f63b4b4ca29d3e9ccb330d [file] [log] [blame]
// 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.packages;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Interner;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.LabelConstants;
import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import com.google.devtools.build.lib.collect.CollectionUtils;
import com.google.devtools.build.lib.collect.ImmutableSortedKeyMap;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.events.ExtendedEventHandler.Postable;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.License.DistributionType;
import com.google.devtools.build.lib.packages.RuleClass.Builder.ThirdPartyLicenseExistencePolicy;
import com.google.devtools.build.lib.skyframe.serialization.DeserializationContext;
import com.google.devtools.build.lib.skyframe.serialization.ObjectCodec;
import com.google.devtools.build.lib.skyframe.serialization.SerializationContext;
import com.google.devtools.build.lib.skyframe.serialization.SerializationException;
import com.google.devtools.build.lib.syntax.StarlarkSemantics;
import com.google.devtools.build.lib.util.SpellChecker;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.Root;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import javax.annotation.Nullable;
/**
* A package, which is a container of {@link Rule}s, each of which contains a dictionary of named
* attributes.
*
* <p>Package instances are intended to be immutable and for all practical purposes can be treated
* as such. Note, however, that some member variables exposed via the public interface are not
* strictly immutable, so until their types are guaranteed immutable we're not applying the
* {@code @Immutable} annotation here.
*
* <p>When changing this class, make sure to make corresponding changes to serialization!
*/
@SuppressWarnings("JavaLangClash")
public class Package {
/**
* Common superclass for all name-conflict exceptions.
*/
public static class NameConflictException extends Exception {
private NameConflictException(String message) {
super(message);
}
}
/**
* The repository identifier for this package.
*/
private final PackageIdentifier packageIdentifier;
/**
* The name of the package, e.g. "foo/bar".
*/
private final String name;
/**
* Like name, but in the form of a PathFragment.
*/
private final PathFragment nameFragment;
/** The filename of this package's BUILD file. */
private RootedPath filename;
/**
* The directory in which this package's BUILD file resides. All InputFile
* members of the packages are located relative to this directory.
*/
private Path packageDirectory;
/**
* The name of the workspace this package is in. Used as a prefix for the runfiles directory.
* This can be set in the WORKSPACE file. This must be a valid target name.
*/
private String workspaceName;
/**
* The root of the source tree in which this package was found. It is an invariant that {@code
* sourceRoot.getRelative(packageId.getSourceRoot()).equals(packageDirectory)}.
*/
private Root sourceRoot;
/**
* The "Make" environment of this package, containing package-local
* definitions of "Make" variables.
*/
private ImmutableMap<String, String> makeEnv;
/** The collection of all targets defined in this package, indexed by name. */
private ImmutableSortedKeyMap<String, Target> targets;
/**
* Default visibility for rules that do not specify it.
*/
private RuleVisibility defaultVisibility;
private boolean defaultVisibilitySet;
/**
* Default package-level 'testonly' value for rules that do not specify it.
*/
private boolean defaultTestOnly = false;
/**
* Default package-level 'deprecation' value for rules that do not specify it.
*/
private String defaultDeprecation;
/**
* Default header strictness checking for rules that do not specify it.
*/
private String defaultHdrsCheck;
/** Default copts for cc_* rules. The rules' individual copts will append to this value. */
private ImmutableList<String> defaultCopts;
/**
* The InputFile target corresponding to this package's BUILD file.
*/
private InputFile buildFile;
/**
* True iff this package's BUILD files contained lexical or grammatical
* errors, or experienced errors during evaluation, or semantic errors during
* the construction of any rule.
*
* <p>Note: A package containing errors does not necessarily prevent a build;
* if all the rules needed for a given build were constructed prior to the
* first error, the build may proceed.
*/
private boolean containsErrors;
/**
* The list of transitive closure of the Skylark file dependencies.
*/
private ImmutableList<Label> skylarkFileDependencies;
/**
* The package's default "licenses" and "distribs" attributes, as specified
* in calls to licenses() and distribs() in the BUILD file.
*/
// These sets contain the values specified by the most recent licenses() or
// distribs() declarations encountered during package parsing:
private License defaultLicense;
private Set<License.DistributionType> defaultDistributionSet;
/**
* The map from each repository to that repository's remappings map.
* This is only used in the //external package, it is an empty map for all other packages.
* For example, an entry of {"@foo" : {"@x", "@y"}} indicates that, within repository foo,
* "@x" should be remapped to "@y".
*/
private ImmutableMap<RepositoryName, ImmutableMap<RepositoryName, RepositoryName>>
externalPackageRepositoryMappings;
/**
* The map of repository reassignments for BUILD packages. This will be empty for packages
* within the main workspace.
*/
private ImmutableMap<RepositoryName, RepositoryName> repositoryMapping;
/**
* The names of the package() attributes that declare default values for rule
* {@link RuleClass#COMPATIBLE_ENVIRONMENT_ATTR} and {@link RuleClass#RESTRICTED_ENVIRONMENT_ATTR}
* values when not explicitly specified.
*/
public static final String DEFAULT_COMPATIBLE_WITH_ATTRIBUTE = "default_compatible_with";
public static final String DEFAULT_RESTRICTED_TO_ATTRIBUTE = "default_restricted_to";
private Set<Label> defaultCompatibleWith = ImmutableSet.of();
private Set<Label> defaultRestrictedTo = ImmutableSet.of();
private ImmutableSet<String> features;
private ImmutableList<Event> events;
private ImmutableList<Postable> posts;
private ImmutableList<String> registeredExecutionPlatforms;
private ImmutableList<String> registeredToolchains;
/**
* Package initialization, part 1 of 3: instantiates a new package with the
* given name.
*
* <p>As part of initialization, {@link Builder} constructs {@link InputFile}
* and {@link PackageGroup} instances that require a valid Package instance where
* {@link Package#getNameFragment()} is accessible. That's why these settings are
* applied here at the start.
*
* @precondition {@code name} must be a suffix of
* {@code filename.getParentDirectory())}.
*/
protected Package(PackageIdentifier packageId, String runfilesPrefix) {
this.packageIdentifier = packageId;
this.workspaceName = runfilesPrefix;
this.nameFragment = packageId.getPackageFragment();
this.name = nameFragment.getPathString();
}
/** Returns this packages' identifier. */
public PackageIdentifier getPackageIdentifier() {
return packageIdentifier;
}
/**
* Returns the repository mapping for the requested external repository.
*
* @throws UnsupportedOperationException if called from a package other than
* the //external package
*/
public ImmutableMap<RepositoryName, RepositoryName> getRepositoryMapping(
RepositoryName repository) {
if (!packageIdentifier.equals(LabelConstants.EXTERNAL_PACKAGE_IDENTIFIER)) {
throw new UnsupportedOperationException("Can only access the external package repository"
+ "mappings from the //external package");
}
return externalPackageRepositoryMappings.getOrDefault(repository, ImmutableMap.of());
}
/** Get the repository mapping for this package. */
public ImmutableMap<RepositoryName, RepositoryName> getRepositoryMapping() {
return repositoryMapping;
}
/**
* Returns the full map of repository mappings collected so far.
*
* @throws UnsupportedOperationException if called from a package other than the //external
* package
*/
public ImmutableMap<RepositoryName, ImmutableMap<RepositoryName, RepositoryName>>
getExternalPackageRepositoryMappings() {
if (!packageIdentifier.equals(LabelConstants.EXTERNAL_PACKAGE_IDENTIFIER)) {
throw new UnsupportedOperationException(
"Can only access the external package repository"
+ "mappings from the //external package");
}
return this.externalPackageRepositoryMappings;
}
/**
* Package initialization: part 2 of 3: sets this package's default header
* strictness checking.
*
* <p>This is needed to support C++-related rule classes
* which accesses {@link #getDefaultHdrsCheck} from the still-under-construction
* package.
*/
private void setDefaultHdrsCheck(String defaultHdrsCheck) {
this.defaultHdrsCheck = defaultHdrsCheck;
}
/**
* Set the default 'testonly' value for this package.
*/
private void setDefaultTestOnly(boolean testOnly) {
defaultTestOnly = testOnly;
}
/**
* Set the default 'deprecation' value for this package.
*/
private void setDefaultDeprecation(String deprecation) {
defaultDeprecation = deprecation;
}
/**
* Sets the default value to use for a rule's {@link RuleClass#COMPATIBLE_ENVIRONMENT_ATTR}
* attribute when not explicitly specified by the rule.
*/
private void setDefaultCompatibleWith(Set<Label> environments) {
defaultCompatibleWith = environments;
}
/**
* Sets the default value to use for a rule's {@link RuleClass#RESTRICTED_ENVIRONMENT_ATTR}
* attribute when not explicitly specified by the rule.
*/
private void setDefaultRestrictedTo(Set<Label> environments) {
defaultRestrictedTo = environments;
}
/**
* Returns the source root (a directory) beneath which this package's BUILD file was found.
*
* <p>Assumes invariant: {@code
* getSourceRoot().getRelative(packageId.getSourceRoot()).equals(getPackageDirectory())}
*/
public Root getSourceRoot() {
return sourceRoot;
}
private static Root getSourceRoot(RootedPath buildFileRootedPath, PathFragment packageFragment) {
PathFragment packageDirectory = buildFileRootedPath.getRootRelativePath().getParentDirectory();
if (packageFragment.equals(packageDirectory)) {
// Fast path: BUILD file path and package name are the same, don't create an extra root.
return buildFileRootedPath.getRoot();
}
PathFragment current = buildFileRootedPath.asPath().asFragment().getParentDirectory();
for (int i = 0, len = packageFragment.segmentCount(); i < len && current != null; i++) {
current = current.getParentDirectory();
}
if (current == null || current.isEmpty()) {
// This is never really expected to work. The check below in #finishInit should fail.
return buildFileRootedPath.getRoot();
}
// Note that current is an absolute path.
return Root.fromPath(buildFileRootedPath.getRoot().getRelative(current));
}
/**
* Package initialization: part 3 of 3: applies all other settings and completes
* initialization of the package.
*
* <p>Only after this method is called can this package be considered "complete"
* and be shared publicly.
*/
private void finishInit(Builder builder) {
// If any error occurred during evaluation of this package, consider all
// rules in the package to be "in error" also (even if they were evaluated
// prior to the error). This behaviour is arguably stricter than need be,
// but stopping a build only for some errors but not others creates user
// confusion.
if (builder.containsErrors) {
for (Rule rule : builder.getTargets(Rule.class)) {
rule.setContainsErrors();
}
}
this.filename = builder.getFilename();
this.packageDirectory = filename.asPath().getParentDirectory();
this.sourceRoot = getSourceRoot(filename, packageIdentifier.getSourceRoot());
if ((sourceRoot.asPath() == null
|| !sourceRoot.getRelative(packageIdentifier.getSourceRoot()).equals(packageDirectory))
&& !filename.getRootRelativePath().getBaseName().equals("WORKSPACE")) {
throw new IllegalArgumentException(
"Invalid BUILD file name for package '"
+ packageIdentifier
+ "': "
+ filename
+ " (in source "
+ sourceRoot
+ " with packageDirectory "
+ packageDirectory
+ " and package identifier source root "
+ packageIdentifier.getSourceRoot()
+ ")");
}
this.makeEnv = ImmutableMap.copyOf(builder.makeEnv);
this.targets = ImmutableSortedKeyMap.copyOf(builder.targets);
this.defaultVisibility = builder.defaultVisibility;
this.defaultVisibilitySet = builder.defaultVisibilitySet;
if (builder.defaultCopts == null) {
this.defaultCopts = ImmutableList.of();
} else {
this.defaultCopts = ImmutableList.copyOf(builder.defaultCopts);
}
this.buildFile = builder.buildFile;
this.containsErrors = builder.containsErrors;
this.skylarkFileDependencies = builder.skylarkFileDependencies;
this.defaultLicense = builder.defaultLicense;
this.defaultDistributionSet = builder.defaultDistributionSet;
this.features = ImmutableSortedSet.copyOf(builder.features);
this.events = ImmutableList.copyOf(builder.events);
this.posts = ImmutableList.copyOf(builder.posts);
this.registeredExecutionPlatforms = ImmutableList.copyOf(builder.registeredExecutionPlatforms);
this.registeredToolchains = ImmutableList.copyOf(builder.registeredToolchains);
this.repositoryMapping = Preconditions.checkNotNull(builder.repositoryMapping);
ImmutableMap.Builder<RepositoryName, ImmutableMap<RepositoryName, RepositoryName>>
repositoryMappingsBuilder = ImmutableMap.builder();
if (!builder.externalPackageRepositoryMappings.isEmpty() && !builder.isWorkspace()) {
// 'repo_mapping' should only be used in the //external package, i.e. should only appear
// in WORKSPACE files. Currently, if someone tries to use 'repo_mapping' in a BUILD rule, they
// will get a "no such attribute" error. This check is to protect against a 'repo_mapping'
// attribute being added to a rule in the future.
throw new IllegalArgumentException(
"'repo_mapping' may only be used in the //external package");
}
builder.externalPackageRepositoryMappings.forEach((k, v) ->
repositoryMappingsBuilder.put(k, ImmutableMap.copyOf(v)));
this.externalPackageRepositoryMappings = repositoryMappingsBuilder.build();
}
/**
* Returns the list of transitive closure of the Skylark file dependencies of this package.
*/
public ImmutableList<Label> getSkylarkFileDependencies() {
return skylarkFileDependencies;
}
/**
* Returns the filename of the BUILD file which defines this package. The parent directory of the
* BUILD file is the package directory.
*/
public RootedPath getFilename() {
return filename;
}
/**
* Returns the directory containing the package's BUILD file.
*/
public Path getPackageDirectory() {
return packageDirectory;
}
/**
* Returns the name of this package. If this build is using external repositories then this name
* may not be unique!
*/
public String getName() {
return name;
}
/**
* Like {@link #getName}, but has type {@code PathFragment}.
*/
public PathFragment getNameFragment() {
return nameFragment;
}
/**
* Returns all make variables for a given platform.
*/
public ImmutableMap<String, String> getMakeEnvironment() {
return makeEnv;
}
/**
* Returns the label of this package's BUILD file.
*
* <p> Typically <code>getBuildFileLabel().getName().equals("BUILD")</code> --
* though not necessarily: data in a subdirectory of a test package may use a
* different filename to avoid inadvertently creating a new package.
*/
public Label getBuildFileLabel() {
return buildFile.getLabel();
}
/**
* Returns the InputFile target for this package's BUILD file.
*/
public InputFile getBuildFile() {
return buildFile;
}
/**
* Returns true if errors were encountered during evaluation of this package.
* (The package may be incomplete and its contents should not be relied upon
* for critical operations. However, any Rules belonging to the package are
* guaranteed to be intact, unless their <code>containsErrors()</code> flag
* is set.)
*/
public boolean containsErrors() {
return containsErrors;
}
public List<Postable> getPosts() {
return posts;
}
public List<Event> getEvents() {
return events;
}
/** Returns an (immutable, ordered) view of all the targets belonging to this package. */
public ImmutableSortedKeyMap<String, Target> getTargets() {
return targets;
}
/** Common getTargets implementation, accessible by {@link Package.Builder}. */
private static Set<Target> getTargets(BiMap<String, Target> targetMap) {
return targetMap.values();
}
/**
* Returns a (read-only, ordered) iterable of all the targets belonging
* to this package which are instances of the specified class.
*/
public <T extends Target> Iterable<T> getTargets(Class<T> targetClass) {
return getTargets(targets, targetClass);
}
/**
* Common getTargets implementation, accessible by both {@link Package} and
* {@link Package.Builder}.
*/
private static <T extends Target> Iterable<T> getTargets(Map<String, Target> targetMap,
Class<T> targetClass) {
return Iterables.filter(targetMap.values(), targetClass);
}
/**
* Returns the rule that corresponds to a particular BUILD target name. Useful
* for walking through the dependency graph of a target.
* Fails if the target is not a Rule.
*/
@VisibleForTesting // Should be package-private
public Rule getRule(String targetName) {
return (Rule) targets.get(targetName);
}
/** Returns all rules in the package that match the given rule class. */
public Iterable<Rule> getRulesMatchingRuleClass(final String ruleClass) {
Iterable<Rule> targets = getTargets(Rule.class);
return Iterables.filter(targets, rule -> rule.getRuleClass().equals(ruleClass));
}
/**
* Returns this package's workspace name.
*/
public String getWorkspaceName() {
return workspaceName;
}
/**
* Returns the features specified in the <code>package()</code> declaration.
*/
public ImmutableSet<String> getFeatures() {
return features;
}
/**
* Returns the target (a member of this package) whose name is "targetName".
* First rules are searched, then output files, then input files. The target
* name must be valid, as defined by {@code LabelValidator#validateTargetName}.
*
* @throws NoSuchTargetException if the specified target was not found.
*/
public Target getTarget(String targetName) throws NoSuchTargetException {
Target target = targets.get(targetName);
if (target != null) {
return target;
}
// No such target.
// If there's a file on the disk that's not mentioned in the BUILD file,
// produce a more informative error. NOTE! this code path is only executed
// on failure, which is (relatively) very rare. In the common case no
// stat(2) is executed.
Path filename = getPackageDirectory().getRelative(targetName);
String suffix;
if (!PathFragment.isNormalized(targetName) || "*".equals(targetName)) {
// Don't check for file existence if the target name is not normalized
// because the error message would be confusing and wrong. If the
// targetName is "foo/bar/.", and there is a directory "foo/bar", it
// doesn't mean that "//pkg:foo/bar/." is a valid label.
// Also don't check if the target name is a single * character since
// it's invalid on Windows.
suffix = "";
} else if (filename.isDirectory()) {
suffix = "; however, a source directory of this name exists. (Perhaps add "
+ "'exports_files([\"" + targetName + "\"])' to " + name + "/BUILD, or define a "
+ "filegroup?)";
} else if (filename.exists()) {
suffix = "; however, a source file of this name exists. (Perhaps add "
+ "'exports_files([\"" + targetName + "\"])' to " + name + "/BUILD?)";
} else {
suffix = SpellChecker.didYouMean(targetName, targets.keySet());
}
throw makeNoSuchTargetException(targetName, suffix);
}
protected NoSuchTargetException makeNoSuchTargetException(String targetName, String suffix) {
Label label;
try {
label = Label.create(packageIdentifier, targetName);
} catch (LabelSyntaxException e) {
throw new IllegalArgumentException(targetName);
}
String msg =
String.format(
"target '%s' not declared in package '%s'%s defined by %s",
targetName, name, suffix, filename.asPath().getPathString());
return new NoSuchTargetException(label, msg);
}
/**
* Returns the default visibility for this package.
*/
public RuleVisibility getDefaultVisibility() {
return defaultVisibility;
}
/**
* Returns the default testonly value.
*/
public Boolean getDefaultTestOnly() {
return defaultTestOnly;
}
/**
* Returns the default deprecation value.
*/
public String getDefaultDeprecation() {
return defaultDeprecation;
}
/** Gets the default header checking mode. */
public String getDefaultHdrsCheck() {
return defaultHdrsCheck != null ? defaultHdrsCheck : "strict";
}
/**
* Returns the default copts value, to which rules should append their
* specific copts.
*/
public ImmutableList<String> getDefaultCopts() {
return defaultCopts;
}
/**
* Returns whether the default header checking mode has been set or it is the
* default value.
*/
public boolean isDefaultHdrsCheckSet() {
return defaultHdrsCheck != null;
}
public boolean isDefaultVisibilitySet() {
return defaultVisibilitySet;
}
/**
* Gets the parsed license object for the default license
* declared by this package.
*/
public License getDefaultLicense() {
return defaultLicense;
}
/**
* Returns the parsed set of distributions declared as the default for this
* package.
*/
public Set<License.DistributionType> getDefaultDistribs() {
return defaultDistributionSet;
}
/**
* Returns the default value to use for a rule's {@link RuleClass#COMPATIBLE_ENVIRONMENT_ATTR}
* attribute when not explicitly specified by the rule.
*/
public Set<Label> getDefaultCompatibleWith() {
return defaultCompatibleWith;
}
/**
* Returns the default value to use for a rule's {@link RuleClass#RESTRICTED_ENVIRONMENT_ATTR}
* attribute when not explicitly specified by the rule.
*/
public Set<Label> getDefaultRestrictedTo() {
return defaultRestrictedTo;
}
public ImmutableList<String> getRegisteredExecutionPlatforms() {
return registeredExecutionPlatforms;
}
public ImmutableList<String> getRegisteredToolchains() {
return registeredToolchains;
}
@Override
public String toString() {
return "Package(" + name + ")="
+ (targets != null ? getTargets(Rule.class) : "initializing...");
}
/**
* Dumps the package for debugging. Do not depend on the exact format/contents of this debugging
* output.
*/
public void dump(PrintStream out) {
out.println(" Package " + getName() + " (" + getFilename().asPath() + ")");
// Rules:
out.println(" Rules");
for (Rule rule : getTargets(Rule.class)) {
out.println(" " + rule.getTargetKind() + " " + rule.getLabel());
for (Attribute attr : rule.getAttributes()) {
for (Object possibleValue : AggregatingAttributeMapper.of(rule)
.visitAttribute(attr.getName(), attr.getType())) {
out.println(" " + attr.getName() + " = " + possibleValue);
}
}
}
// Files:
out.println(" Files");
for (FileTarget file : getTargets(FileTarget.class)) {
out.print(" " + file.getTargetKind() + " " + file.getLabel());
if (file instanceof OutputFile) {
out.println(" (generated by " + ((OutputFile) file).getGeneratingRule().getLabel() + ")");
} else {
out.println();
}
}
}
public static Builder newExternalPackageBuilder(
Builder.Helper helper, RootedPath workspacePath, String runfilesPrefix) {
Builder b =
new Builder(
helper.createFreshPackage(LabelConstants.EXTERNAL_PACKAGE_IDENTIFIER, runfilesPrefix));
b.setFilename(workspacePath);
return b;
}
/**
* A builder for {@link Package} objects. Only intended to be used by {@link PackageFactory} and
* {@link com.google.devtools.build.lib.skyframe.PackageFunction}.
*/
public static class Builder {
public interface Helper {
/**
* Returns a fresh {@link Package} instance that a {@link Builder} will internally mutate
* during package loading. Called by {@link PackageFactory}.
*/
Package createFreshPackage(PackageIdentifier packageId, String runfilesPrefix);
/**
* Called after {@link com.google.devtools.build.lib.skyframe.PackageFunction} is completely
* done loading the given {@link Package}.
*
* @param pkg the loaded {@link Package}
* @param starlarkSemantics are the semantics used to load the package
* @param loadTimeMs the wall time, in ms, that it took to load the package. More precisely,
* this is the wall time of the call to {@link PackageFactory#createPackageFromAst}.
* Notably, this does not include the time to read and parse the package's BUILD file, nor
* the time to read, parse, or evaluate any of the transitively loaded .bzl files.
*/
void onLoadingComplete(Package pkg, StarlarkSemantics starlarkSemantics, long loadTimeMs);
}
/** {@link Helper} that simply calls the {@link Package} constructor. */
public static class DefaultHelper implements Helper {
public static final DefaultHelper INSTANCE = new DefaultHelper();
private DefaultHelper() {
}
@Override
public Package createFreshPackage(PackageIdentifier packageId, String runfilesPrefix) {
return new Package(packageId, runfilesPrefix);
}
@Override
public void onLoadingComplete(
Package pkg, StarlarkSemantics starlarkSemantics, long loadTimeMs) {}
}
/**
* The output instance for this builder. Needs to be instantiated and
* available with name info throughout initialization. All other settings
* are applied during {@link #build}. See {@link Package#Package}
* and {@link Package#finishInit} for details.
*/
private final Package pkg;
// The map from each repository to that repository's remappings map.
// This is only used in the //external package, it is an empty map for all other packages.
private final HashMap<RepositoryName, HashMap<RepositoryName, RepositoryName>>
externalPackageRepositoryMappings = new HashMap<>();
// The map of repository reassignments for BUILD packages loaded within external repositories.
// It contains an entry from "@<main workspace name>" to "@" for packages within
// the main workspace.
private ImmutableMap<RepositoryName, RepositoryName> repositoryMapping = ImmutableMap.of();
private RootedPath filename = null;
private Label buildFileLabel = null;
private InputFile buildFile = null;
// TreeMap so that the iteration order of variables is predictable. This is useful so that the
// serialized representation is deterministic.
private TreeMap<String, String> makeEnv = new TreeMap<>();
private RuleVisibility defaultVisibility = ConstantRuleVisibility.PRIVATE;
private boolean defaultVisibilitySet;
private List<String> defaultCopts = null;
private List<String> features = new ArrayList<>();
private List<Event> events = Lists.newArrayList();
private List<Postable> posts = Lists.newArrayList();
@Nullable private String ioExceptionMessage = null;
@Nullable private IOException ioException = null;
private boolean containsErrors = false;
private License defaultLicense = License.NO_LICENSE;
private Set<License.DistributionType> defaultDistributionSet = License.DEFAULT_DISTRIB;
private BiMap<String, Target> targets = HashBiMap.create();
private final Map<Label, EnvironmentGroup> environmentGroups = new HashMap<>();
private ImmutableList<Label> skylarkFileDependencies = ImmutableList.of();
private final List<String> registeredExecutionPlatforms = new ArrayList<>();
private final List<String> registeredToolchains = new ArrayList<>();
private ThirdPartyLicenseExistencePolicy thirdPartyLicenceExistencePolicy =
ThirdPartyLicenseExistencePolicy.USER_CONTROLLABLE;
/**
* True iff the "package" function has already been called in this package.
*/
private boolean packageFunctionUsed;
/**
* The collection of the prefixes of every output file. Maps every prefix
* to an output file whose prefix it is.
*
* <p>This is needed to make the output file prefix conflict check be
* reasonably fast. However, since it can potentially take a lot of memory and
* is useless after the package has been loaded, it isn't passed to the
* package itself.
*/
private Map<String, OutputFile> outputFilePrefixes = new HashMap<>();
private final Interner<ImmutableList<?>> listInterner = BlazeInterners.newStrongInterner();
private boolean alreadyBuilt = false;
private EventHandler builderEventHandler = new EventHandler() {
@Override
public void handle(Event event) {
addEvent(event);
}
};
Builder(Package pkg) {
this.pkg = pkg;
if (pkg.getName().startsWith("javatests/")) {
setDefaultTestonly(true);
}
}
Builder(Helper helper, PackageIdentifier id, String runfilesPrefix) {
this(helper.createFreshPackage(id, runfilesPrefix));
}
PackageIdentifier getPackageIdentifier() {
return pkg.getPackageIdentifier();
}
/** Determine if we are in the WORKSPACE file or not */
boolean isWorkspace() {
return pkg.getPackageIdentifier().equals(LabelConstants.EXTERNAL_PACKAGE_IDENTIFIER);
}
String getPackageWorkspaceName() {
return pkg.getWorkspaceName();
}
/**
* Updates the externalPackageRepositoryMappings entry for {@code repoWithin}. Adds new
* entry from {@code localName} to {@code mappedName} in {@code repoWithin}'s map.
*
* @param repoWithin the RepositoryName within which the mapping should apply
* @param localName the RepositoryName that actually appears in the WORKSPACE and BUILD files
* in the {@code repoWithin} repository
* @param mappedName the RepositoryName by which localName should be referenced
*/
Builder addRepositoryMappingEntry(
RepositoryName repoWithin, RepositoryName localName, RepositoryName mappedName) {
HashMap<RepositoryName, RepositoryName> mapping =
externalPackageRepositoryMappings
.computeIfAbsent(repoWithin, (RepositoryName k) -> new HashMap<>());
mapping.put(localName, mappedName);
return this;
}
/** Adds all the mappings from a given {@link Package}. */
Builder addRepositoryMappings(Package aPackage) {
ImmutableMap<RepositoryName, ImmutableMap<RepositoryName, RepositoryName>>
repositoryMappings = aPackage.externalPackageRepositoryMappings;
for (Map.Entry<RepositoryName, ImmutableMap<RepositoryName, RepositoryName>> repositoryName :
repositoryMappings.entrySet()) {
for (Map.Entry<RepositoryName, RepositoryName> repositoryNameRepositoryNameEntry :
repositoryName.getValue().entrySet()) {
addRepositoryMappingEntry(
repositoryName.getKey(),
repositoryNameRepositoryNameEntry.getKey(),
repositoryNameRepositoryNameEntry.getValue());
}
}
return this;
}
/**
* Sets the repository mapping for a regular, BUILD file package (i.e. not the //external
* package)
*/
Builder setRepositoryMapping(ImmutableMap<RepositoryName, RepositoryName> repositoryMapping) {
this.repositoryMapping = Preconditions.checkNotNull(repositoryMapping);
return this;
}
/** Get the repository mapping for this package */
ImmutableMap<RepositoryName, RepositoryName> getRepositoryMapping() {
return this.repositoryMapping;
}
Interner<ImmutableList<?>> getListInterner() {
return listInterner;
}
/** Sets the name of this package's BUILD file. */
Builder setFilename(RootedPath filename) {
this.filename = filename;
try {
buildFileLabel = createLabel(filename.getRootRelativePath().getBaseName());
addInputFile(buildFileLabel, Location.fromPathFragment(filename.asPath().asFragment()));
} catch (LabelSyntaxException e) {
// This can't actually happen.
throw new AssertionError("Package BUILD file has an illegal name: " + filename);
}
return this;
}
Label getBuildFileLabel() {
return buildFileLabel;
}
RootedPath getFilename() {
return filename;
}
public List<Postable> getPosts() {
return posts;
}
public List<Event> getEvents() {
return events;
}
Builder setMakeVariable(String name, String value) {
this.makeEnv.put(name, value);
return this;
}
/**
* Sets the default visibility for this package. Called at most once per
* package from PackageFactory.
*/
Builder setDefaultVisibility(RuleVisibility visibility) {
this.defaultVisibility = visibility;
this.defaultVisibilitySet = true;
return this;
}
/**
* Sets whether the default visibility is set in the BUILD file.
*/
Builder setDefaultVisibilitySet(boolean defaultVisibilitySet) {
this.defaultVisibilitySet = defaultVisibilitySet;
return this;
}
/** Sets the default value of 'testonly'. Rule-level 'testonly' will override this. */
Builder setDefaultTestonly(boolean defaultTestonly) {
pkg.setDefaultTestOnly(defaultTestonly);
return this;
}
/**
* Sets the default value of 'deprecation'. Rule-level 'deprecation' will append to this.
*/
Builder setDefaultDeprecation(String defaultDeprecation) {
pkg.setDefaultDeprecation(defaultDeprecation);
return this;
}
/**
* Uses the workspace name from {@code //external} to set this package's workspace name.
*/
@VisibleForTesting
public Builder setWorkspaceName(String workspaceName) {
pkg.workspaceName = workspaceName;
return this;
}
public Builder setThirdPartyLicenceExistencePolicy(ThirdPartyLicenseExistencePolicy policy) {
this.thirdPartyLicenceExistencePolicy = policy;
return this;
}
public ThirdPartyLicenseExistencePolicy getThirdPartyLicenseExistencePolicy() {
return thirdPartyLicenceExistencePolicy;
}
/**
* Returns whether the "package" function has been called yet
*/
boolean isPackageFunctionUsed() {
return packageFunctionUsed;
}
void setPackageFunctionUsed() {
packageFunctionUsed = true;
}
/**
* Sets the default header checking mode.
*/
public Builder setDefaultHdrsCheck(String hdrsCheck) {
// Note that this setting is propagated directly to the package because
// other code needs the ability to read this info directly from the
// under-construction package. See {@link Package#setDefaultHdrsCheck}.
pkg.setDefaultHdrsCheck(hdrsCheck);
return this;
}
/** Sets the default value of copts. Rule-level copts will append to this. */
public Builder setDefaultCopts(List<String> defaultCopts) {
this.defaultCopts = defaultCopts;
return this;
}
public Builder addFeatures(Iterable<String> features) {
Iterables.addAll(this.features, features);
return this;
}
Builder setIOExceptionAndMessage(IOException e, String message) {
this.ioException = e;
this.ioExceptionMessage = message;
return setContainsErrors();
}
/**
* Declares that errors were encountering while loading this package.
*/
public Builder setContainsErrors() {
containsErrors = true;
return this;
}
public boolean containsErrors() {
return containsErrors;
}
Builder addPosts(Iterable<Postable> posts) {
for (Postable post : posts) {
this.posts.add(post);
}
return this;
}
Builder addEvents(Iterable<Event> events) {
for (Event event : events) {
addEvent(event);
}
return this;
}
public Builder addEvent(Event event) {
this.events.add(event);
return this;
}
Builder setSkylarkFileDependencies(ImmutableList<Label> skylarkFileDependencies) {
this.skylarkFileDependencies = skylarkFileDependencies;
return this;
}
/**
* Sets the default license for this package.
*/
void setDefaultLicense(License license) {
this.defaultLicense = license;
}
License getDefaultLicense() {
return defaultLicense;
}
/**
* Initializes the default set of distributions for targets in this package.
*
* <p> TODO(bazel-team): (2011) consider moving the license & distribs info into Metadata--maybe
* even in the Build language.
*/
void setDefaultDistribs(Set<DistributionType> dists) {
this.defaultDistributionSet = dists;
}
Set<DistributionType> getDefaultDistribs() {
return defaultDistributionSet;
}
/**
* Sets the default value to use for a rule's {@link RuleClass#COMPATIBLE_ENVIRONMENT_ATTR}
* attribute when not explicitly specified by the rule. Records a package error if
* any labels are duplicated.
*/
void setDefaultCompatibleWith(List<Label> environments, String attrName, Location location) {
if (!checkForDuplicateLabels(environments, "package " + pkg.getName(), attrName, location,
builderEventHandler)) {
setContainsErrors();
}
pkg.setDefaultCompatibleWith(ImmutableSet.copyOf(environments));
}
/**
* Sets the default value to use for a rule's {@link RuleClass#RESTRICTED_ENVIRONMENT_ATTR}
* attribute when not explicitly specified by the rule. Records a package error if
* any labels are duplicated.
*/
void setDefaultRestrictedTo(List<Label> environments, String attrName, Location location) {
if (!checkForDuplicateLabels(environments, "package " + pkg.getName(), attrName, location,
builderEventHandler)) {
setContainsErrors();
}
pkg.setDefaultRestrictedTo(ImmutableSet.copyOf(environments));
}
/**
* Creates a new {@link Rule} {@code r} where {@code r.getPackage()} is the {@link Package}
* associated with this {@link Builder}.
*
* <p>The created {@link Rule} will have no attribute values, no output files, and therefore
* will be in an invalid state.
*/
Rule createRule(
Label label,
RuleClass ruleClass,
Location location,
AttributeContainer attributeContainer) {
return new Rule(
pkg,
label,
ruleClass,
location,
attributeContainer);
}
/**
* Same as {@link #createRule(Label, RuleClass, Location, AttributeContainer)}, except
* allows specifying an {@link ImplicitOutputsFunction} override. Only use if you know what
* you're doing.
*/
Rule createRule(
Label label,
RuleClass ruleClass,
Location location,
AttributeContainer attributeContainer,
ImplicitOutputsFunction implicitOutputsFunction) {
return new Rule(
pkg,
label,
ruleClass,
location,
attributeContainer,
implicitOutputsFunction);
}
@Nullable
Target getTarget(String name) {
return targets.get(name);
}
/**
* Removes a target from the {@link Package} under construction. Intended to be used only by
* {@link com.google.devtools.build.lib.skyframe.PackageFunction} to remove targets whose
* labels cross subpackage boundaries.
*/
public void removeTarget(Target target) {
if (target.getPackage() == pkg) {
this.targets.remove(target.getName());
}
}
public Set<Target> getTargets() {
return Package.getTargets(targets);
}
/**
* Returns an (immutable, unordered) view of all the targets belonging to
* this package which are instances of the specified class.
*/
private <T extends Target> Iterable<T> getTargets(Class<T> targetClass) {
return Package.getTargets(targets, targetClass);
}
/**
* An input file name conflicts with an existing package member.
*/
static class GeneratedLabelConflict extends NameConflictException {
private GeneratedLabelConflict(String message) {
super(message);
}
}
/**
* Creates an input file target in this package with the specified name.
*
* @param targetName name of the input file. This must be a valid target
* name as defined by {@link
* com.google.devtools.build.lib.cmdline.LabelValidator#validateTargetName}.
* @return the newly-created InputFile, or the old one if it already existed.
* @throws GeneratedLabelConflict if the name was already taken by a Rule or
* an OutputFile target.
* @throws IllegalArgumentException if the name is not a valid label
*/
InputFile createInputFile(String targetName, Location location)
throws GeneratedLabelConflict {
Target existing = targets.get(targetName);
if (existing == null) {
try {
return addInputFile(createLabel(targetName), location);
} catch (LabelSyntaxException e) {
throw new IllegalArgumentException("FileTarget in package " + pkg.getName()
+ " has illegal name: " + targetName);
}
} else if (existing instanceof InputFile) {
return (InputFile) existing; // idempotent
} else {
throw new GeneratedLabelConflict("generated label '//" + pkg.getName() + ":"
+ targetName + "' conflicts with existing "
+ existing.getTargetKind());
}
}
/**
* Sets the visibility and license for an input file. The input file must already exist as
* a member of this package.
* @throws IllegalArgumentException if the input file doesn't exist in this
* package's target map.
*/
void setVisibilityAndLicense(InputFile inputFile, RuleVisibility visibility, License license) {
String filename = inputFile.getName();
Target cacheInstance = targets.get(filename);
if (!(cacheInstance instanceof InputFile)) {
throw new IllegalArgumentException("Can't set visibility for nonexistent FileTarget "
+ filename + " in package " + pkg.getName() + ".");
}
if (!((InputFile) cacheInstance).isVisibilitySpecified()
|| cacheInstance.getVisibility() != visibility
|| !Objects.equals(cacheInstance.getLicense(), license)) {
targets.put(filename, new InputFile(
pkg, cacheInstance.getLabel(), cacheInstance.getLocation(), visibility, license));
}
}
/**
* Creates a label for a target inside this package.
*
* @throws LabelSyntaxException if the {@code targetName} is invalid
*/
Label createLabel(String targetName) throws LabelSyntaxException {
return Label.create(pkg.getPackageIdentifier(), targetName);
}
/**
* Adds a package group to the package.
*/
void addPackageGroup(String name, Collection<String> packages, Collection<Label> includes,
EventHandler eventHandler, Location location)
throws NameConflictException, LabelSyntaxException {
PackageGroup group =
new PackageGroup(createLabel(name), pkg, packages, includes, eventHandler, location);
Target existing = targets.get(group.getName());
if (existing != null) {
throw nameConflict(group, existing);
}
targets.put(group.getName(), group);
if (group.containsErrors()) {
setContainsErrors();
}
}
/**
* Checks if any labels in the given list appear multiple times and reports an appropriate
* error message if so. Returns true if no duplicates were found, false otherwise.
*
* <p> TODO(bazel-team): apply this to all build functions (maybe automatically?), possibly
* integrate with RuleClass.checkForDuplicateLabels.
*/
private static boolean checkForDuplicateLabels(Collection<Label> labels, String owner,
String attrName, Location location, EventHandler eventHandler) {
Set<Label> dupes = CollectionUtils.duplicatedElementsOf(labels);
for (Label dupe : dupes) {
eventHandler.handle(Event.error(location, String.format(
"label '%s' is duplicated in the '%s' list of '%s'", dupe, attrName, owner)));
}
return dupes.isEmpty();
}
/**
* Adds an environment group to the package.
*/
void addEnvironmentGroup(String name, List<Label> environments, List<Label> defaults,
EventHandler eventHandler, Location location)
throws NameConflictException, LabelSyntaxException {
if (!checkForDuplicateLabels(environments, name, "environments", location, eventHandler)
|| !checkForDuplicateLabels(defaults, name, "defaults", location, eventHandler)) {
setContainsErrors();
return;
}
EnvironmentGroup group = new EnvironmentGroup(createLabel(name), pkg, environments,
defaults, location);
Target existing = targets.get(group.getName());
if (existing != null) {
throw nameConflict(group, existing);
}
targets.put(group.getName(), group);
Collection<Event> membershipErrors = group.validateMembership();
if (!membershipErrors.isEmpty()) {
for (Event error : membershipErrors) {
eventHandler.handle(error);
}
setContainsErrors();
return;
}
// For each declared environment, make sure it doesn't also belong to some other group.
for (Label environment : group.getEnvironments()) {
EnvironmentGroup otherGroup = environmentGroups.get(environment);
if (otherGroup != null) {
eventHandler.handle(Event.error(location, "environment " + environment + " belongs to"
+ " both " + group.getLabel() + " and " + otherGroup.getLabel()));
setContainsErrors();
} else {
environmentGroups.put(environment, group);
}
}
}
/**
* Same as {@link #addRule}, except with no name conflict checks.
*
* <p>Don't call this function unless you know what you're doing.
*/
void addRuleUnchecked(Rule rule) {
Preconditions.checkArgument(rule.getPackage() == pkg);
// Now, modify the package:
for (OutputFile outputFile : rule.getOutputFiles()) {
targets.put(outputFile.getName(), outputFile);
PathFragment outputFileFragment = PathFragment.create(outputFile.getName());
int segmentCount = outputFileFragment.segmentCount();
for (int i = 1; i < segmentCount; i++) {
String prefix = outputFileFragment.subFragment(0, i).toString();
outputFilePrefixes.putIfAbsent(prefix, outputFile);
}
}
targets.put(rule.getName(), rule);
if (rule.containsErrors()) {
this.setContainsErrors();
}
}
void addRule(Rule rule) throws NameConflictException {
checkForConflicts(rule);
addRuleUnchecked(rule);
}
void addRegisteredExecutionPlatforms(List<String> platforms) {
this.registeredExecutionPlatforms.addAll(platforms);
}
void addRegisteredToolchains(List<String> toolchains) {
this.registeredToolchains.addAll(toolchains);
}
private Builder beforeBuild(boolean discoverAssumedInputFiles) throws NoSuchPackageException {
Preconditions.checkNotNull(pkg);
Preconditions.checkNotNull(filename);
Preconditions.checkNotNull(buildFileLabel);
Preconditions.checkNotNull(makeEnv);
if (ioException != null) {
throw new NoSuchPackageException(getPackageIdentifier(), ioExceptionMessage, ioException);
}
// We create the original BUILD InputFile when the package filename is set; however, the
// visibility may be overridden with an exports_files directive, so we need to obtain the
// current instance here.
buildFile = (InputFile) Preconditions.checkNotNull(targets.get(buildFileLabel.getName()));
// The Iterable returned by getTargets is sorted, so when we build up the list of tests by
// processing it in order below, that list will be sorted too.
Iterable<Rule> sortedRules = ImmutableList.copyOf(getTargets(Rule.class));
List<Label> sortedTests = new ArrayList<>();
for (final Rule rule : sortedRules) {
if (discoverAssumedInputFiles) {
// All labels mentioned in a rule that refer to an unknown target in the
// current package are assumed to be InputFiles, so let's create them:
for (AttributeMap.DepEdge depEdge : AggregatingAttributeMapper.of(rule).visitLabels()) {
createInputFileMaybe(
depEdge.getLabel(), rule.getAttributeLocation(depEdge.getAttribute().getName()));
}
}
// "test_suite" rules have the idiosyncratic semantics of implicitly
// depending on all tests in the package, iff tests=[] and suites=[].
// Note, we implement this here when the Package is fully constructed,
// since clearly this information isn't available at Rule construction
// time, as forward references are permitted.
if (TargetUtils.isTestRule(rule) && !TargetUtils.hasManualTag(rule)) {
sortedTests.add(rule.getLabel());
}
}
for (Rule rule : sortedRules) {
AttributeMap attributes = NonconfigurableAttributeMapper.of(rule);
if (rule.getRuleClass().equals("test_suite")
&& attributes.get("tests", BuildType.LABEL_LIST).isEmpty()) {
rule.setAttributeValueByName("$implicit_tests", sortedTests);
}
}
return this;
}
/** Intended for use by {@link com.google.devtools.build.lib.skyframe.PackageFunction} only. */
public Builder buildPartial() throws NoSuchPackageException {
if (alreadyBuilt) {
return this;
}
return beforeBuild(/*discoverAssumedInputFiles=*/ true);
}
/** Intended for use by {@link com.google.devtools.build.lib.skyframe.PackageFunction} only. */
public Package finishBuild() {
if (alreadyBuilt) {
return pkg;
}
// Freeze targets and distributions.
targets = Maps.unmodifiableBiMap(targets);
defaultDistributionSet =
Collections.unmodifiableSet(defaultDistributionSet);
// Now all targets have been loaded, so we validate the group's member environments.
for (EnvironmentGroup envGroup : ImmutableSet.copyOf(environmentGroups.values())) {
Collection<Event> errors = envGroup.processMemberEnvironments(targets);
if (!errors.isEmpty()) {
addEvents(errors);
setContainsErrors();
}
}
// Build the package.
pkg.finishInit(this);
alreadyBuilt = true;
return pkg;
}
public Package build() throws NoSuchPackageException {
return build(/*discoverAssumedInputFiles=*/ true);
}
/**
* Build the package, optionally adding any labels in the package not already associated with a
* target as an input file.
*/
Package build(boolean discoverAssumedInputFiles) throws NoSuchPackageException {
if (alreadyBuilt) {
return pkg;
}
beforeBuild(discoverAssumedInputFiles);
return finishBuild();
}
/**
* If "label" refers to a non-existent target in the current package, create
* an InputFile target.
*/
private void createInputFileMaybe(Label label, Location location) {
if (label != null && label.getPackageIdentifier().equals(pkg.getPackageIdentifier())) {
if (!targets.containsKey(label.getName())) {
addInputFile(label, location);
}
}
}
private InputFile addInputFile(Label label, Location location) {
InputFile inputFile = new InputFile(pkg, label, location);
Target prev = targets.put(label.getName(), inputFile);
Preconditions.checkState(prev == null);
return inputFile;
}
/**
* Precondition check for addRule. We must maintain these invariants of the package:
*
* <ul>
* <li>Each name refers to at most one target.
* <li>No rule with errors is inserted into the package.
* <li>The generating rule of every output file in the package must itself be in the package.
* </ul>
*/
private void checkForConflicts(Rule rule) throws NameConflictException {
String name = rule.getName();
Target existing = targets.get(name);
if (existing != null) {
throw nameConflict(rule, existing);
}
Map<String, OutputFile> outputFiles = new HashMap<>();
for (OutputFile outputFile : rule.getOutputFiles()) {
String outputFileName = outputFile.getName();
if (outputFiles.put(outputFileName, outputFile) != null) { // dups within a single rule:
throw duplicateOutputFile(outputFile, outputFile);
}
existing = targets.get(outputFileName);
if (existing != null) {
throw duplicateOutputFile(outputFile, existing);
}
// Check if this output file is the prefix of an already existing one
if (outputFilePrefixes.containsKey(outputFileName)) {
throw conflictingOutputFile(outputFile, outputFilePrefixes.get(outputFileName));
}
// Check if a prefix of this output file matches an already existing one
PathFragment outputFileFragment = PathFragment.create(outputFileName);
int segmentCount = outputFileFragment.segmentCount();
for (int i = 1; i < segmentCount; i++) {
String prefix = outputFileFragment.subFragment(0, i).toString();
if (outputFiles.containsKey(prefix)) {
throw conflictingOutputFile(outputFile, outputFiles.get(prefix));
}
if (targets.containsKey(prefix)
&& targets.get(prefix) instanceof OutputFile) {
throw conflictingOutputFile(outputFile, (OutputFile) targets.get(prefix));
}
outputFilePrefixes.putIfAbsent(prefix, outputFile);
}
}
checkForInputOutputConflicts(rule, outputFiles.keySet());
}
/**
* A utility method that checks for conflicts between input file names and output file names for
* a rule from a build file.
*
* @param rule the rule whose inputs and outputs are to be checked for conflicts.
* @param outputFiles a set containing the names of output files to be generated by the rule.
* @throws NameConflictException if a conflict is found.
*/
private void checkForInputOutputConflicts(Rule rule, Set<String> outputFiles)
throws NameConflictException {
PackageIdentifier packageIdentifier = rule.getLabel().getPackageIdentifier();
for (Label inputLabel : rule.getLabels()) {
if (packageIdentifier.equals(inputLabel.getPackageIdentifier())
&& outputFiles.contains(inputLabel.getName())) {
throw inputOutputNameConflict(rule, inputLabel.getName());
}
}
}
/** An output file conflicts with another output file or the BUILD file. */
private NameConflictException duplicateOutputFile(OutputFile duplicate, Target existing) {
return new NameConflictException(duplicate.getTargetKind() + " '" + duplicate.getName()
+ "' in rule '" + duplicate.getGeneratingRule().getName() + "' "
+ conflictsWith(existing));
}
/** The package contains two targets with the same name. */
private NameConflictException nameConflict(Target duplicate, Target existing) {
return new NameConflictException(duplicate.getTargetKind() + " '" + duplicate.getName()
+ "' in package '" + duplicate.getLabel().getPackageName() + "' "
+ conflictsWith(existing));
}
/** A a rule has a input/output name conflict. */
private NameConflictException inputOutputNameConflict(Rule rule, String conflictingName) {
return new NameConflictException("rule '" + rule.getName() + "' has file '"
+ conflictingName + "' as both an input and an output");
}
private static NameConflictException conflictingOutputFile(
OutputFile added, OutputFile existing) {
if (added.getGeneratingRule() == existing.getGeneratingRule()) {
return new NameConflictException(String.format(
"rule '%s' has conflicting output files '%s' and '%s'", added.getGeneratingRule()
.getName(), added.getName(), existing.getName()));
} else {
return new NameConflictException(String.format(
"output file '%s' of rule '%s' conflicts with output file '%s' of rule '%s'", added
.getName(), added.getGeneratingRule().getName(), existing.getName(), existing
.getGeneratingRule().getName()));
}
}
/**
* Utility function for generating exception messages.
*/
private static String conflictsWith(Target target) {
String message = "conflicts with existing ";
if (target instanceof OutputFile) {
message +=
"generated file from rule '"
+ ((OutputFile) target).getGeneratingRule().getName()
+ "'";
} else {
message += target.getTargetKind();
}
return message + ", defined at " + target.getLocation();
}
}
/** Package codec implementation. */
@VisibleForTesting
static final class PackageCodec implements ObjectCodec<Package> {
@Override
public Class<Package> getEncodedClass() {
return Package.class;
}
@Override
public void serialize(
SerializationContext context,
Package input,
CodedOutputStream codedOut)
throws IOException, SerializationException {
context.checkClassExplicitlyAllowed(Package.class, input);
PackageCodecDependencies codecDeps = context.getDependency(PackageCodecDependencies.class);
codecDeps.getPackageSerializer().serialize(context, input, codedOut);
}
@Override
public Package deserialize(
DeserializationContext context,
CodedInputStream codedIn)
throws SerializationException, IOException {
PackageCodecDependencies codecDeps = context.getDependency(PackageCodecDependencies.class);
try {
return codecDeps.getPackageSerializer().deserialize(context, codedIn);
} catch (InterruptedException e) {
throw new IllegalStateException(
"Unexpected InterruptedException during Package deserialization", e);
}
}
}
}