com.google.javascript.jscomp.Compiler Maven / Gradle / Ivy
/*
* Copyright 2004 The Closure Compiler Authors.
*
* 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.javascript.jscomp;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Strings.isNullOrEmpty;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import com.google.common.collect.Streams;
import com.google.debugging.sourcemap.SourceMapConsumerV3;
import com.google.debugging.sourcemap.proto.Mapping.OriginalMapping;
import com.google.javascript.jscomp.CompilerOptions.DevMode;
import com.google.javascript.jscomp.CompilerOptions.InstrumentOption;
import com.google.javascript.jscomp.CoverageInstrumentationPass.CoverageReach;
import com.google.javascript.jscomp.SortingErrorManager.ErrorReportGenerator;
import com.google.javascript.jscomp.deps.BrowserModuleResolver;
import com.google.javascript.jscomp.deps.BrowserWithTransformedPrefixesModuleResolver;
import com.google.javascript.jscomp.deps.JsFileRegexParser;
import com.google.javascript.jscomp.deps.ModuleLoader;
import com.google.javascript.jscomp.deps.ModuleLoader.ModuleResolverFactory;
import com.google.javascript.jscomp.deps.NodeModuleResolver;
import com.google.javascript.jscomp.deps.SortedDependencies.MissingProvideException;
import com.google.javascript.jscomp.deps.WebpackModuleResolver;
import com.google.javascript.jscomp.diagnostic.LogFile;
import com.google.javascript.jscomp.modules.ModuleMap;
import com.google.javascript.jscomp.modules.ModuleMetadataMap;
import com.google.javascript.jscomp.parsing.Config;
import com.google.javascript.jscomp.parsing.ParserRunner;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.jscomp.parsing.parser.FeatureSet.Feature;
import com.google.javascript.jscomp.parsing.parser.trees.Comment;
import com.google.javascript.jscomp.resources.ResourceLoader;
import com.google.javascript.jscomp.type.ChainableReverseAbstractInterpreter;
import com.google.javascript.jscomp.type.ClosureReverseAbstractInterpreter;
import com.google.javascript.jscomp.type.ReverseAbstractInterpreter;
import com.google.javascript.jscomp.type.SemanticReverseAbstractInterpreter;
import com.google.javascript.rhino.ErrorReporter;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.InputId;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import com.google.javascript.rhino.jstype.JSTypeRegistry;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.Serializable;
import java.nio.file.Files;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
/**
* Compiler (and the other classes in this package) does the following:
*
* - parses JS code
*
- checks for undefined variables
*
- performs optimizations such as constant folding and constants inlining
*
- renames variables (to short names)
*
- outputs compact JavaScript code
*
*
* External variables are declared in 'externs' files. For instance, the file
* may include definitions for global javascript/browser objects such as
* window, document.
*/
// TODO(tbreisacher): Rename Compiler to JsCompiler and remove this suppression.
@SuppressWarnings("JavaLangClash")
public class Compiler extends AbstractCompiler implements ErrorHandler, SourceFileMapping {
static final DiagnosticType MODULE_DEPENDENCY_ERROR =
DiagnosticType.error("JSC_MODULE_DEPENDENCY_ERROR",
"Bad dependency: {0} -> {1}. "
+ "Modules must be listed in dependency order.");
static final DiagnosticType MISSING_ENTRY_ERROR = DiagnosticType.error(
"JSC_MISSING_ENTRY_ERROR",
"required entry point \"{0}\" never provided");
static final DiagnosticType MISSING_MODULE_ERROR = DiagnosticType.error(
"JSC_MISSING_MODULE_ERROR",
"unknown module \"{0}\" specified in entry point spec");
static final DiagnosticType INCONSISTENT_MODULE_DEFINITIONS = DiagnosticType.error(
"JSC_INCONSISTENT_MODULE_DEFINITIONS",
"Serialized module definitions are not consistent with the module definitions supplied in "
+ "the command line");
private static final String CONFIG_RESOURCE =
"com.google.javascript.jscomp.parsing.ParserConfig";
CompilerOptions options = null;
private PassConfig passes = null;
// The externs inputs
private List externs;
// The source module graph, denoting dependencies between chunks.
private JSModuleGraph moduleGraph;
// The module loader for resolving paths into module URIs.
private ModuleLoader moduleLoader;
// Map of module names to module types - used for module rewriting
private final Map moduleTypesByName;
// error manager to which error management is delegated
private ErrorManager errorManager;
// Warnings guard for filtering warnings.
private WarningsGuard warningsGuard;
// Compile-time injected libraries. The node points to the last node of
// the library, so code can be inserted after.
private final Map injectedLibraries = new LinkedHashMap<>();
// Node of the final injected library. Future libraries will be injected
// after this node.
private Node lastInjectedLibrary;
// Parse tree root nodes
Node externsRoot;
Node jsRoot;
Node externAndJsRoot;
// Used for debugging; to see the compiled code between passes
private String lastJsSource = null;
private FeatureSet featureSet;
private final Map inputsById = new ConcurrentHashMap<>();
private final Map scriptNodeByFilename = new ConcurrentHashMap<>();
private transient IncrementalScopeCreator scopeCreator = null;
private ImmutableMap inputPathByWebpackId;
/**
* Subclasses are responsible for loading sources that were not provided as explicit inputs to the
* compiler. For example, looking up sources referenced within sourcemaps.
*/
public static class ExternalSourceLoader {
public SourceFile loadSource(String filename) {
throw new RuntimeException("Cannot load without a valid loader.");
}
}
// Original sources referenced by the source maps.
private final ConcurrentHashMap sourceMapOriginalSources =
new ConcurrentHashMap<>();
/** Configured {@link SourceMapInput}s, plus any source maps discovered in source files. */
ConcurrentHashMap inputSourceMaps = new ConcurrentHashMap<>();
// Map from filenames to lists of all the comments in each file.
private Map> commentsPerFile = new ConcurrentHashMap<>();
/** The source code map */
private SourceMap sourceMap;
/** The externs created from the exports. */
private String externExports = null;
private UniqueIdSupplier uniqueIdSupplier = new UniqueIdSupplier();
/**
* Ids for function inlining so that each declared name remains
* unique.
*/
private int uniqueNameId = 0;
/**
* Whether to assume there are references to the RegExp Global object
* properties.
*/
private boolean hasRegExpGlobalReferences = true;
/** Detects Google-specific coding conventions. */
CodingConvention defaultCodingConvention = new ClosureCodingConvention();
private JSTypeRegistry typeRegistry;
private volatile Config parserConfig = null;
private volatile Config externsParserConfig = null;
private ReverseAbstractInterpreter abstractInterpreter;
private TypeValidator typeValidator;
// The compiler can ask phaseOptimizer for things like which pass is currently
// running, or which functions have been changed by optimizations
private PhaseOptimizer phaseOptimizer = null;
public PerformanceTracker tracker;
// Types that have been forward declared
private Set forwardDeclaredTypes = new HashSet<>();
private boolean typeCheckingHasRun = false;
// This error reporter gets the messages from the current Rhino parser or TypeRegistry.
private final ErrorReporter oldErrorReporter =
RhinoErrorReporter.forOldRhino(this);
/** Error strings used for reporting JSErrors */
public static final DiagnosticType OPTIMIZE_LOOP_ERROR = DiagnosticType.error(
"JSC_OPTIMIZE_LOOP_ERROR",
"Exceeded max number of optimization iterations: {0}");
public static final DiagnosticType MOTION_ITERATIONS_ERROR =
DiagnosticType.error("JSC_MOTION_ITERATIONS_ERROR",
"Exceeded max number of code motion iterations: {0}");
private final CompilerExecutor compilerExecutor = createCompilerExecutor();
/**
* Logger for the whole com.google.javascript.jscomp domain -
* setting configuration for this logger affects all loggers
* in other classes within the compiler.
*/
public static final Logger logger =
Logger.getLogger("com.google.javascript.jscomp");
private final PrintStream outStream;
private GlobalVarReferenceMap globalRefMap = null;
private volatile double progress = 0.0;
private String lastPassName;
private Set externProperties = null;
private AccessorSummary accessorSummary = AccessorSummary.create(ImmutableMap.of());
private static final Joiner pathJoiner = Joiner.on(File.separator);
// Starts at 0, increases as "interesting" things happen.
// Nothing happens at time START_TIME, the first pass starts at time 1.
// The correctness of scope-change tracking relies on Node/getIntProp
// returning 0 if the custom attribute on a node hasn't been set.
private int changeStamp = 1;
private final Timeline changeTimeline = new Timeline<>();
private final Timeline deleteTimeline = new Timeline<>();
/**
* When mapping symbols from a source map, we must repeatedly combine the path of the original
* file with the path from the source map to compute the SourceFile of the underlying code. When
* iterating through adjacent symbols this computation ends up computing the same thing.
*
* This object tracks the last source map we resolved to reduce that work. It caches: for a
* given originalPath+sourceMapPath, what sourceFile did we find?
*/
private static class ResolvedSourceMap {
public String originalPath;
public String sourceMapPath;
public String relativePath;
}
/**
* There is exactly one cached resolvedSourceMap, which you can think of as a cache of size one.
*/
private final ResolvedSourceMap resolvedSourceMap = new ResolvedSourceMap();
/**
* Creates a Compiler that reports errors and warnings to its logger.
*/
public Compiler() {
this((PrintStream) null);
}
/**
* Creates a Compiler that reports errors and warnings to an output stream.
*/
public Compiler(PrintStream outStream) {
addChangeHandler(recentChange);
this.outStream = outStream;
this.moduleTypesByName = new HashMap<>();
}
/**
* Creates a Compiler that uses a custom error manager.
*/
public Compiler(ErrorManager errorManager) {
this();
setErrorManager(errorManager);
}
/**
* Sets the error manager.
*
* @param errorManager the error manager, it cannot be {@code null}
*/
public void setErrorManager(ErrorManager errorManager) {
checkNotNull(errorManager, "the error manager cannot be null");
this.errorManager = new ThreadSafeDelegatingErrorManager(errorManager);
}
/**
* Creates a message formatter instance corresponding to the value of
* {@link CompilerOptions}.
*/
private MessageFormatter createMessageFormatter() {
boolean colorize = options.shouldColorizeErrorOutput();
return options.errorFormat.toFormatter(this, colorize);
}
/**
* Initializes the compiler options. It's called as part of a normal compile() job.
* Public for the callers that are not doing a normal compile() job.
*/
public void initOptions(CompilerOptions options) {
this.options = options;
this.setFeatureSet(options.getLanguageIn().toFeatureSet());
if (errorManager == null) {
if (this.outStream == null) {
setErrorManager(
new LoggerErrorManager(createMessageFormatter(), logger));
} else {
ImmutableSet.Builder builder = ImmutableSet.builder();
builder.add(
new PrintStreamErrorReportGenerator(
createMessageFormatter(), this.outStream, options.summaryDetailLevel));
builder.addAll(options.getExtraReportGenerators());
setErrorManager(new SortingErrorManager(builder.build()));
}
}
moduleLoader = ModuleLoader.EMPTY;
reconcileOptionsWithGuards();
// TODO(johnlenz): generally, the compiler should not be changing the options object
// provided by the user. This should be handled a different way.
// Turn off type-based optimizations when type checking is off
if (!options.isTypecheckingEnabled()) {
options.setUseTypesForLocalOptimization(false);
options.setUseTypesForOptimization(false);
}
if (options.assumeForwardDeclaredForMissingTypes) {
this.forwardDeclaredTypes =
new AbstractSet() {
@Override
public boolean contains(Object o) {
return true; // Report all types as forward declared types.
}
@Override
public boolean add(String e) {
return false;
}
@Override
public Iterator iterator() {
return Collections.emptySet().iterator();
}
@Override
public int size() {
return 0;
}
};
}
initWarningsGuard(options.getWarningsGuard());
}
public void printConfig(PrintStream printStream) {
printStream.println("==== Externs ====");
printStream.println(externs);
printStream.println("==== Inputs ====");
// To get a pretty-printed JSON module graph, change this line to
//
// printStream.println(
// new GsonBuilder().setPrettyPrinting().create().toJson(moduleGraph.toJson()));
//
// TODO(bradfordcsmith): Come up with a JSON-printing version that will work when this code is
// compiled with J2CL, so we can permanently improve this.
printStream.println(Iterables.toString(moduleGraph.getAllInputs()));
printStream.println("==== CompilerOptions ====");
printStream.println(options);
printStream.println("==== WarningsGuard ====");
printStream.println(warningsGuard);
}
private void initWarningsGuard(WarningsGuard warningsGuard) {
ImmutableList.Builder guards = ImmutableList.builder();
guards
.add(new J2clSuppressWarningsGuard())
.add(new SuppressDocWarningsGuard(this, DiagnosticGroups.getRegisteredGroups()))
.add(warningsGuard);
if (this.options != null && this.options.shouldSkipUnsupportedPasses()) {
guards.add(
new DiagnosticGroupWarningsGuard(
DiagnosticGroups.FEATURES_NOT_SUPPORTED_BY_PASS, CheckLevel.WARNING));
}
this.warningsGuard = new ComposeWarningsGuard(guards.build());
}
/** When the CompilerOptions and its WarningsGuard overlap, reconcile any discrepancies. */
protected void reconcileOptionsWithGuards() {
// DiagnosticGroups override the plain checkTypes option.
if (options.enables(DiagnosticGroups.CHECK_TYPES)) {
options.checkTypes = true;
} else if (options.disables(DiagnosticGroups.CHECK_TYPES)) {
options.checkTypes = false;
} else if (!options.checkTypes) {
// If DiagnosticGroups did not override the plain checkTypes
// option, and checkTypes is disabled, then turn off the
// parser type warnings.
options.setWarningLevel(
DiagnosticGroup.forType(
RhinoErrorReporter.TYPE_PARSE_ERROR),
CheckLevel.OFF);
}
if (!options.checkTypes) {
options.setWarningLevel(DiagnosticGroups.BOUNDED_GENERICS, CheckLevel.OFF);
}
if (options.expectStrictModeInput()) {
options.setWarningLevel(
DiagnosticGroups.ES5_STRICT,
CheckLevel.ERROR);
}
// All passes must run the variable check. This synthesizes
// variables later so that the compiler doesn't crash. It also
// checks the externs file for validity. If you don't want to warn
// about missing variable declarations, we shut that specific
// error off.
if (!options.checkSymbols && !options.enables(DiagnosticGroups.CHECK_VARIABLES)) {
options.setWarningLevel(DiagnosticGroups.CHECK_VARIABLES, CheckLevel.OFF);
}
// If we're in transpile-only mode, we don't need to do checks for suspicious var usages.
// Since we still have to run VariableReferenceCheck before transpilation to check block-scoped
// variables, though, we disable the unnecessary warnings it produces relating to vars here.
if (options.skipNonTranspilationPasses && !options.enables(DiagnosticGroups.CHECK_VARIABLES)) {
options.setWarningLevel(DiagnosticGroups.CHECK_VARIABLES, CheckLevel.OFF);
}
// If we're in transpile-only mode, we don't need to check for missing requires unless the user
// explicitly enables missing-provide checks.
if (options.skipNonTranspilationPasses && !options.enables(DiagnosticGroups.MISSING_PROVIDE)) {
options.setWarningLevel(DiagnosticGroups.MISSING_PROVIDE, CheckLevel.OFF);
}
if (options.brokenClosureRequiresLevel == CheckLevel.OFF) {
options.setWarningLevel(DiagnosticGroups.MISSING_PROVIDE, CheckLevel.OFF);
}
}
/** Initializes the instance state needed for a compile job. */
public final void init(
List externs, List sources, CompilerOptions options) {
JSModule module = new JSModule(JSModule.STRONG_MODULE_NAME);
for (SourceFile source : sources) {
module.add(new CompilerInput(source));
}
List modules = new ArrayList<>(1);
modules.add(module);
initModules(externs, modules, options);
addFilesToSourceMap(sources);
}
/**
* Initializes the instance state needed for a compile job if the sources
* are in modules.
*/
public void initModules(
List externs, List modules, CompilerOptions options) {
initOptions(options);
checkFirstModule(modules);
this.externs = makeExternInputs(externs);
// Generate the module graph, and report any errors in the module specification as errors.
try {
this.moduleGraph = new JSModuleGraph(modules);
} catch (JSModuleGraph.ModuleDependenceException e) {
// problems with the module format. Report as an error. The
// message gives all details.
report(JSError.make(MODULE_DEPENDENCY_ERROR,
e.getModule().getName(), e.getDependentModule().getName()));
return;
}
// Creating the module graph can move weak source around, and end up with empty modules.
fillEmptyModules(getModules());
this.commentsPerFile = new ConcurrentHashMap<>(moduleGraph.getInputCount());
initBasedOnOptions();
initInputsByIdMap();
initAST();
// If debug logging is enabled, write out the module / chunk graph in GraphViz format.
// This graph is often too big to reasonably render.
// Using gvpr(1) is recommended to extract the parts of the graph that are of interest.
// `dot -Tpng graph_file.dot > graph_file.png` will render an image.
try (LogFile moduleGraphLog = createOrReopenLog(this.getClass(), "chunk_graph.dot")) {
moduleGraphLog.log(DotFormatter.toDot(moduleGraph.toGraphvizGraph()));
}
}
/**
* Do any initialization that is dependent on the compiler options.
*/
public void initBasedOnOptions() {
inputSourceMaps.putAll(options.inputSourceMaps);
// Create the source map if necessary.
if (options.sourceMapOutputPath != null) {
sourceMap = options.sourceMapFormat.getInstance();
sourceMap.setPrefixMappings(options.sourceMapLocationMappings);
if (options.applyInputSourceMaps) {
sourceMap.setSourceFileMapping(this);
if (options.sourceMapIncludeSourcesContent) {
for (SourceMapInput inputSourceMap : inputSourceMaps.values()) {
addSourceMapSourceFiles(inputSourceMap);
}
}
}
}
}
private List makeExternInputs(List externSources) {
List inputs = new ArrayList<>(externSources.size());
for (SourceFile file : externSources) {
inputs.add(new CompilerInput(file, /* isExtern= */ true));
}
return inputs;
}
private static final DiagnosticType EMPTY_MODULE_LIST_ERROR =
DiagnosticType.error("JSC_EMPTY_MODULE_LIST_ERROR",
"At least one module must be provided");
private static final DiagnosticType EMPTY_ROOT_MODULE_ERROR =
DiagnosticType.error("JSC_EMPTY_ROOT_MODULE_ERROR",
"Root module ''{0}'' must contain at least one source code input");
/**
* Verifies that at least one module has been provided and that the first one
* has at least one source code input.
*/
private void checkFirstModule(List modules) {
if (modules.isEmpty()) {
report(JSError.make(EMPTY_MODULE_LIST_ERROR));
} else if (modules.get(0).getInputs().isEmpty() && modules.size() > 1) {
// The root module may only be empty if there is exactly 1 module.
report(JSError.make(EMPTY_ROOT_MODULE_ERROR,
modules.get(0).getName()));
}
}
/**
* Creates an OS specific path string from parts
*/
public static String joinPathParts(String... pathParts) {
return pathJoiner.join(pathParts);
}
/** Fill any empty modules with a place holder file. It makes any cross module motion easier. */
private void fillEmptyModules(Iterable modules) {
for (JSModule module : modules) {
if (!module.getName().equals(JSModule.WEAK_MODULE_NAME) && module.getInputs().isEmpty()) {
CompilerInput input =
new CompilerInput(SourceFile.fromCode(createFillFileName(module.getName()), ""));
input.setCompiler(this);
module.add(input);
}
}
}
/**
* Rebuilds the internal input map by iterating over all modules. This is necessary if inputs have
* been added to or removed from a module after an {@link #init} or {@link #initModules} call.
*/
public void rebuildInputsFromModules() {
initInputsByIdMap();
}
static final DiagnosticType DUPLICATE_INPUT =
DiagnosticType.error("JSC_DUPLICATE_INPUT", "Duplicate input: {0}");
static final DiagnosticType DUPLICATE_EXTERN_INPUT =
DiagnosticType.error("JSC_DUPLICATE_EXTERN_INPUT",
"Duplicate extern input: {0}");
/**
* Creates a map to make looking up an input by name fast. Also checks for
* duplicate inputs.
*/
void initInputsByIdMap() {
inputsById.clear();
for (CompilerInput input : externs) {
InputId id = input.getInputId();
CompilerInput previous = putCompilerInput(id, input);
if (previous != null) {
report(JSError.make(DUPLICATE_EXTERN_INPUT, input.getName()));
}
}
for (CompilerInput input : moduleGraph.getAllInputs()) {
InputId id = input.getInputId();
CompilerInput previous = putCompilerInput(id, input);
if (previous != null) {
report(JSError.make(DUPLICATE_INPUT, input.getName()));
}
}
}
/**
* Sets up the skeleton of the AST (the externs and root).
*/
private void initAST() {
jsRoot = IR.root();
externsRoot = IR.root();
externAndJsRoot = IR.root(externsRoot, jsRoot);
}
/** Compiles a single source file and a single externs file. */
public Result compile(SourceFile extern, SourceFile input, CompilerOptions options) {
return compile(ImmutableList.of(extern), ImmutableList.of(input), options);
}
/**
* Compiles a list of inputs.
*
* This is a convenience method to wrap up all the work of compilation, including
* generating the error and warning report.
*
*
NOTE: All methods called here must be public, because client code must be able to replicate
* and customize this.
*/
public Result compile(
List externs, List inputs, CompilerOptions options) {
// The compile method should only be called once.
checkState(jsRoot == null);
try {
init(externs, inputs, options);
if (options.printConfig) {
printConfig(System.err);
}
if (!hasErrors()) {
parseForCompilation();
}
if (!hasErrors()) {
if (options.getInstrumentForCoverageOnly()) {
// TODO(bradfordcsmith): The option to instrument for coverage only should belong to the
// runner, not the compiler.
instrumentForCoverage();
} else {
stage1Passes();
if (!hasErrors()) {
stage2Passes();
}
}
performPostCompilationTasks();
}
} finally {
generateReport();
}
return getResult();
}
/**
* Generates a report of all warnings and errors found during compilation to stderr.
*
* Client code must call this method explicitly if it doesn't use one of the convenience
* methods that do so automatically.
*
Always call this method, even if the compiler throws an exception. The report will include
* information about the exception.
*/
public void generateReport() {
Tracer t = newTracer("generateReport");
errorManager.generateReport();
stopTracer(t, "generateReport");
}
/**
* Compiles a list of modules.
*
*
This is a convenience method to wrap up all the work of compilation, including
* generating the error and warning report.
*
*
NOTE: All methods called here must be public, because client code must be able to replicate
* and customize this.
*/
public Result compileModules(
List externs, List modules, CompilerOptions options) {
// The compile method should only be called once.
checkState(jsRoot == null);
try {
initModules(externs, modules, options);
if (options.printConfig) {
printConfig(System.err);
}
if (!hasErrors()) {
parseForCompilation();
}
if (!hasErrors()) {
// TODO(bradfordcsmith): The option to instrument for coverage only should belong to the
// runner, not the compiler.
if (options.getInstrumentForCoverageOnly()) {
instrumentForCoverage();
} else {
stage1Passes();
if (!hasErrors()) {
stage2Passes();
}
}
performPostCompilationTasks();
}
} finally {
generateReport();
}
return getResult();
}
/**
* Perform compiler passes for stage 1 of compilation.
*
* Stage 1 consists primarily of error and type checking passes.
*
*
{@code parseForCompilation()} must be called before this method is called.
*
*
The caller is responsible for also calling {@code generateReport()} to generate a report of
* warnings and errors to stderr. See the invocation in {@link #compile} for a good example.
*/
public void stage1Passes() {
checkState(moduleGraph != null, "No inputs. Did you call init() or initModules()?");
checkState(!hasErrors());
checkState(!options.getInstrumentForCoverageOnly());
runInCompilerThread(
() -> {
performChecksAndTranspilation();
return null;
});
}
/**
* Perform compiler passes for stage 2 of compilation.
*
*
Stage 2 consists primarily of optimization passes.
*
*
{@code stage1Passes()} must be called before this method is called.
*
*
The caller is responsible for also calling {@code generateReport()} to generate a report of
* warnings and errors to stderr. See the invocation in {@link #compile} for a good example.
*/
public void stage2Passes() {
checkState(moduleGraph != null, "No inputs. Did you call init() or initModules()?");
checkState(!hasErrors());
checkState(!options.getInstrumentForCoverageOnly());
JSModule weakModule = moduleGraph.getModuleByName(JSModule.WEAK_MODULE_NAME);
if (weakModule != null) {
for (CompilerInput i : moduleGraph.getAllInputs()) {
if (i.getSourceFile().isWeak()) {
checkState(
i.getModule() == weakModule, "Expected all weak files to be in the weak module.");
}
}
}
runInCompilerThread(
() -> {
if (options.shouldOptimize()) {
performOptimizations();
}
return null;
});
}
/**
* Disable threads. This is for clients that run on AppEngine and
* don't have threads.
*/
public void disableThreads() {
compilerExecutor.disableThreads();
}
/**
* Sets the timeout when Compiler is run in a thread
* @param timeout seconds to wait before timeout
*/
public void setTimeout(int timeout) {
compilerExecutor.setTimeout(timeout);
}
/**
* The primary purpose of this method is to run the provided code with a larger than standard
* stack.
*/
T runInCompilerThread(Callable callable) {
return compilerExecutor.runInCompilerThread(
callable, options != null && options.getTracerMode().isOn());
}
private void performChecksAndTranspilation() {
if (options.skipNonTranspilationPasses) {
// i.e. whitespace-only mode, which will not work with goog.module without:
whitespaceOnlyPasses();
if (options.needsTranspilationFrom(options.getLanguageIn().toFeatureSet())) {
transpileAndDontCheck();
}
} else {
check(); // check() also includes transpilation
}
}
/**
* Performs all the bookkeeping required at the end of a compilation.
*
* This method must be called if the compilation makes it as far as doing checks.
*
DON'T call it if the compiler threw an exception.
*
DO call it even when {@code hasErrors()} returns true.
*/
public void performPostCompilationTasks() {
runInCompilerThread(
() -> {
performPostCompilationTasksInternal();
return null;
});
}
/**
* Performs all the bookkeeping required at the end of a compilation.
*/
private void performPostCompilationTasksInternal() {
if (options.devMode == DevMode.START_AND_END) {
runValidityCheck();
}
setProgress(1.0, "recordFunctionInformation");
if (tracker != null) {
if (options.getTracerOutput() == null) {
tracker.outputTracerReport(this.outStream);
} else {
try (PrintStream out = new PrintStream(Files.newOutputStream(options.getTracerOutput()))) {
tracker.outputTracerReport(out);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}
/**
* Instrument code for coverage.
*
*
{@code parseForCompilation()} must be called before this method is called.
*
*
The caller is responsible for also calling {@code generateReport()} to generate a report of
* warnings and errors to stderr. See the invocation in {@link #compile} for a good example.
*
*
This method is mutually exclusive with stage1Passes() and stage2Passes().
* Either call those two methods or this one, but not both.
*/
public void instrumentForCoverage() {
checkState(moduleGraph != null, "No inputs. Did you call init() or initModules()?");
checkState(!hasErrors());
runInCompilerThread(
() -> {
checkState(options.getInstrumentForCoverageOnly());
checkState(!hasErrors());
if (options.getInstrumentForCoverageOption() != InstrumentOption.NONE) {
instrumentForCoverageInternal(options.getInstrumentForCoverageOption());
}
return null;
});
}
private void instrumentForCoverageInternal(InstrumentOption instrumentForCoverageOption) {
Tracer tracer = newTracer("instrumentationPass");
process(new CoverageInstrumentationPass(this, CoverageReach.ALL, instrumentForCoverageOption));
stopTracer(tracer, "instrumentationPass");
}
/**
* Parses input files in preparation for compilation.
*
*
Either {@code init()} or {@code initModules()} must be called first to set up the input
* files to be read.
*
TODO(bradfordcsmith): Rename this to parse()
*/
public void parseForCompilation() {
runInCompilerThread(
() -> {
parseForCompilationInternal();
return null;
});
}
/**
* Parses input files in preparation for compilation.
*
*
Either {@code init()} or {@code initModules()} must be called first to set up the input
* files to be read.
*
*
TODO(bradfordcsmith): Rename this to parse()
*/
private void parseForCompilationInternal() {
setProgress(0.0, null);
CompilerOptionsPreprocessor.preprocess(options);
maybeSetTracker();
parseInputs();
// Guesstimate.
setProgress(0.15, "parse");
}
/**
* Parses input files without doing progress tracking that is part of a full compile.
*
*
Either {@code init()} or {@code initModules()} must be called first to set up the input
* files to be read.
*
TODO(bradfordcsmith): Rename this to parseIndependentOfCompilation() or similar.
*/
public void parse() {
parseInputs();
}
public Node parse(SourceFile file) {
initCompilerOptionsIfTesting();
logger.finest("Parsing: " + file.getName());
return new JsAst(file).getAstRoot(this);
}
PassConfig getPassConfig() {
if (passes == null) {
passes = createPassConfigInternal();
}
return passes;
}
/** Create the passes object. Clients should use setPassConfig instead of overriding this. */
protected PassConfig createPassConfigInternal() {
return new DefaultPassConfig(options);
}
/**
* @param passes The PassConfig to use with this Compiler.
* @throws NullPointerException if passes is null
* @throws IllegalStateException if this.passes has already been assigned
*/
public void setPassConfig(PassConfig passes) {
// Important to check for null because if setPassConfig(null) is
// called before this.passes is set, getPassConfig() will create a
// new PassConfig object and use that, which is probably not what
// the client wanted since they probably meant to use their
// own PassConfig object.
checkNotNull(passes);
checkState(this.passes == null, "setPassConfig was already called");
this.passes = passes;
}
public void whitespaceOnlyPasses() {
runCustomPasses(CustomPassExecutionTime.BEFORE_CHECKS);
Tracer t = newTracer("runWhitespaceOnlyPasses");
try {
for (PassFactory pf : getPassConfig().getWhitespaceOnlyPasses()) {
pf.create(this).process(externsRoot, jsRoot);
}
} finally {
stopTracer(t, "runWhitespaceOnlyPasses");
}
}
public void transpileAndDontCheck() {
Tracer t = newTracer("runTranspileOnlyPasses");
try {
for (PassFactory pf : getPassConfig().getTranspileOnlyPasses()) {
if (hasErrors()) {
return;
}
pf.create(this).process(externsRoot, jsRoot);
}
} finally {
stopTracer(t, "runTranspileOnlyPasses");
}
}
private PhaseOptimizer createPhaseOptimizer() {
PhaseOptimizer phaseOptimizer = new PhaseOptimizer(this, tracker);
if (options.devMode == DevMode.EVERY_PASS) {
phaseOptimizer.setValidityCheck(validityCheck);
}
if (options.getCheckDeterminism()) {
phaseOptimizer.setPrintAstHashcodes(true);
}
return phaseOptimizer;
}
void check() {
runCustomPasses(CustomPassExecutionTime.BEFORE_CHECKS);
// We are currently only interested in check-passes for progress reporting
// as it is used for IDEs, that's why the maximum progress is set to 1.0.
phaseOptimizer = createPhaseOptimizer().withProgress(
new PhaseOptimizer.ProgressRange(getProgress(), 1.0));
phaseOptimizer.consume(getPassConfig().getChecks());
phaseOptimizer.process(externsRoot, jsRoot);
if (hasErrors()) {
return;
}
runCustomPasses(CustomPassExecutionTime.BEFORE_OPTIMIZATIONS);
phaseOptimizer = null;
}
@Override
void setExternExports(String externExports) {
this.externExports = externExports;
}
@Override
void process(CompilerPass p) {
p.process(externsRoot, jsRoot);
}
private final PassFactory validityCheck =
PassFactory.builder()
.setName("validityCheck")
.setRunInFixedPointLoop(true)
.setInternalFactory(ValidityCheck::new)
.setFeatureSetForChecks()
.build();
private void runValidityCheck() {
validityCheck.create(this).process(externsRoot, jsRoot);
}
/**
* Runs custom passes that are designated to run at a particular time.
*/
private void runCustomPasses(CustomPassExecutionTime executionTime) {
if (options.customPasses != null) {
Tracer t = newTracer("runCustomPasses");
try {
for (CompilerPass p : options.customPasses.get(executionTime)) {
process(p);
}
} finally {
stopTracer(t, "runCustomPasses");
}
}
}
@Override
final void beforePass(String passName) {
super.beforePass(passName);
}
@Override
final void afterPass(String passName) {
super.afterPass(passName);
this.maybePrintSourceAfterEachPass(passName);
}
private void maybePrintSourceAfterEachPass(String passName) {
if (!options.printSourceAfterEachPass) {
return;
}
String currentJsSource = getCurrentJsSource();
if (currentJsSource.equals(this.lastJsSource)) {
return;
}
if (this.getOptions().getDebugLogDirectory() == null) {
System.err.println();
System.err.println("// " + passName + " yields:");
System.err.println("// ************************************");
System.err.println(currentJsSource);
System.err.println("// ************************************");
} else {
try (LogFile log =
this.createOrReopenIndexedLog(this.getClass(), "src_after_pass", passName)) {
log.log(currentJsSource);
}
}
this.lastJsSource = currentJsSource;
}
final String getCurrentJsSource() {
this.resetAndIntitializeSourceMap();
List fileNameRegexList = options.filesToPrintAfterEachPassRegexList;
List moduleNameRegexList = options.chunksToPrintAfterEachPassRegexList;
StringBuilder builder = new StringBuilder();
if (fileNameRegexList.isEmpty() && moduleNameRegexList.isEmpty()) {
return toSource();
}
if (!fileNameRegexList.isEmpty()) {
checkNotNull(externsRoot);
checkNotNull(jsRoot);
for (Node fileNode : Iterables.concat(externsRoot.children(), jsRoot.children())) {
String fileName = fileNode.getSourceFileName();
for (String regex : fileNameRegexList) {
if (fileName.matches(regex)) {
String source = "// " + fileName + "\n" + toSource(fileNode);
builder.append(source);
break;
}
}
}
if (builder.toString().isEmpty()) {
throw new RuntimeException("No files matched any of: " + fileNameRegexList);
}
}
if (!moduleNameRegexList.isEmpty()) {
for (JSModule jsModule : getModules()) {
for (String regex : moduleNameRegexList) {
if (jsModule.getName().matches(regex)) {
String source = "// module '" + jsModule.getName() + "'\n" + toSource(jsModule);
builder.append(source);
break;
}
}
}
if (builder.toString().isEmpty()) {
throw new RuntimeException("No modules matched any of: " + moduleNameRegexList);
}
}
return builder.toString();
}
@Override
@Nullable
public final Node getScriptNode(String filename) {
return scriptNodeByFilename.get(checkNotNull(filename));
}
/**
* Returns a new tracer for the given pass name.
*/
Tracer newTracer(String passName) {
String comment = passName
+ (recentChange.hasCodeChanged() ? " on recently changed AST" : "");
if (options.getTracerMode().isOn() && tracker != null) {
tracker.recordPassStart(passName, true);
}
return new Tracer("Compiler", comment);
}
void stopTracer(Tracer t, String passName) {
long result = t.stop();
if (options.getTracerMode().isOn() && tracker != null) {
tracker.recordPassStop(passName, result);
}
}
/**
* Returns the result of the compilation.
*/
public Result getResult() {
Set transpiledFiles = new HashSet<>();
if (jsRoot != null) {
for (Node scriptNode : jsRoot.children()) {
if (scriptNode.getBooleanProp(Node.TRANSPILED)) {
transpiledFiles.add(getSourceFileByName(scriptNode.getSourceFileName()));
}
}
}
return new Result(
getErrors(),
getWarnings(),
this.variableMap,
this.propertyMap,
this.anonymousFunctionNameMap,
this.stringMap,
this.instrumentationMapping,
this.sourceMap,
this.externExports,
this.cssNames,
this.idGeneratorMap,
transpiledFiles);
}
/** Returns the list of errors (never null). */
public ImmutableList getErrors() {
return (errorManager == null) ? ImmutableList.of() : errorManager.getErrors();
}
/** Returns the list of warnings (never null). */
public ImmutableList getWarnings() {
return (errorManager == null) ? ImmutableList.of() : errorManager.getWarnings();
}
@Override
public Node getRoot() {
return externAndJsRoot;
}
@Override
FeatureSet getFeatureSet() {
return featureSet;
}
@Override
void setFeatureSet(FeatureSet fs) {
featureSet = fs;
}
@Override
UniqueIdSupplier getUniqueIdSupplier() {
return this.uniqueIdSupplier;
}
/** Creates a new id for making unique names. */
@Deprecated
private int nextUniqueNameId() {
return uniqueNameId++;
}
/** Resets the unique name id counter */
@Deprecated
@VisibleForTesting
void resetUniqueNameId() {
uniqueNameId = 0;
}
/**
* Legacy supplier for getting unique names.
*
* @deprecated This is deprecated because this supplier fails to generate unique Ids across input
* files when used for tagged template literal transpilation. Kindly use the new {@code
* UniqueIdSupplier} instead.
*/
@Deprecated
@Override
Supplier getUniqueNameIdSupplier() {
return () -> String.valueOf(Compiler.this.nextUniqueNameId());
}
@Override
boolean areNodesEqualForInlining(Node n1, Node n2) {
if (options.shouldAmbiguateProperties() || options.shouldDisambiguateProperties()) {
// The type based optimizations require that type information is preserved
// during other optimizations.
return n1.isEquivalentToTyped(n2);
} else {
return n1.isEquivalentTo(n2);
}
}
//------------------------------------------------------------------------
// Inputs
//------------------------------------------------------------------------
// TODO(nicksantos): Decide which parts of these belong in an AbstractCompiler
// interface, and which ones should always be injected.
@Override
public CompilerInput getInput(InputId id) {
// TODO(bradfordcsmith): Allowing null id is less ideal. Add checkNotNull(id) here and fix
// call sites that break.
if (id == null) {
return null;
}
return inputsById.get(id);
}
/**
* Removes an input file from AST.
* @param id The id of the input to be removed.
*/
protected void removeExternInput(InputId id) {
CompilerInput input = getInput(id);
if (input == null) {
return;
}
checkState(input.isExtern(), "Not an extern input: %s", input.getName());
scriptNodeByFilename.remove(input.getSourceFile().getName());
inputsById.remove(id);
externs.remove(input);
Node root = checkNotNull(input.getAstRoot(this));
if (root != null) {
root.detach();
}
}
// Where to put a new synthetic externs file.
private static enum SyntheticExternsPosition {
START,
END
}
CompilerInput newExternInput(String name, SyntheticExternsPosition pos) {
SourceAst ast = new SyntheticAst(name);
if (inputsById.containsKey(ast.getInputId())) {
throw new IllegalArgumentException("Conflicting externs name: " + name);
}
CompilerInput input = new CompilerInput(ast, true);
Node root = checkNotNull(ast.getAstRoot(this));
putCompilerInput(input.getInputId(), input);
if (pos == SyntheticExternsPosition.START) {
externsRoot.addChildToFront(root);
externs.add(0, input);
} else {
externsRoot.addChildToBack(root);
externs.add(input);
}
scriptNodeByFilename.put(input.getSourceFile().getName(), root);
return input;
}
CompilerInput putCompilerInput(InputId id, CompilerInput input) {
input.setCompiler(this);
return inputsById.put(id, input);
}
/**
* Replace a source input dynamically. Intended for incremental
* re-compilation.
*
* If the new source input doesn't parse, then keep the old input
* in the AST and return false.
*
* @return Whether the new AST was attached successfully.
*/
boolean replaceIncrementalSourceAst(JsAst ast) {
CompilerInput oldInput = getInput(ast.getInputId());
checkNotNull(oldInput, "No input to replace: %s", ast.getInputId().getIdName());
Node newRoot = checkNotNull(ast.getAstRoot(this));
Node oldRoot = oldInput.getAstRoot(this);
oldRoot.replaceWith(newRoot);
CompilerInput newInput = new CompilerInput(ast);
putCompilerInput(ast.getInputId(), newInput);
JSModule module = oldInput.getModule();
if (module != null) {
module.addAfter(newInput, oldInput);
module.remove(oldInput);
}
// Verify the input id is set properly.
checkState(newInput.getInputId().equals(oldInput.getInputId()));
InputId inputIdOnAst = newInput.getAstRoot(this).getInputId();
checkState(newInput.getInputId().equals(inputIdOnAst));
return true;
}
/**
* Add a new source input dynamically. Intended for incremental compilation.
*
* If the new source input doesn't parse, it will not be added, and a false
* will be returned.
*
* @param ast the JS Source to add.
* @return true if the source was added successfully, false otherwise.
* @throws IllegalStateException if an input for this ast already exists.
*/
boolean addNewSourceAst(JsAst ast) {
CompilerInput oldInput = getInput(ast.getInputId());
if (oldInput != null) {
throw new IllegalStateException(
"Input already exists: " + ast.getInputId().getIdName());
}
Node newRoot = checkNotNull(ast.getAstRoot(this));
getRoot().getLastChild().addChildToBack(newRoot);
CompilerInput newInput = new CompilerInput(ast);
// TODO(tylerg): handle this for multiple modules at some point.
JSModule firstModule = Iterables.getFirst(getModules(), null);
if (firstModule.getName().equals(JSModule.STRONG_MODULE_NAME)) {
firstModule.add(newInput);
}
putCompilerInput(ast.getInputId(), newInput);
return true;
}
/**
* Gets the graph of JS source modules.
*
*
Returns null if {@code #init} or {@code #initModules} hasn't been called yet. Otherwise, the
* result is always a module graph, even in the degenerate case where there's only one module.
*/
@Nullable
@Override
JSModuleGraph getModuleGraph() {
return moduleGraph;
}
/**
* Gets the JS source modules in dependency order.
*
*
Returns null if {@code #init} or {@code #initModules} hasn't been called yet. Otherwise, the
* result is always non-empty, even in the degenerate case where there's only one module.
*/
@Nullable
public Iterable getModules() {
return moduleGraph != null ? moduleGraph.getAllModules() : null;
}
@Override
public void clearJSTypeRegistry() {
typeRegistry = null;
typeValidator = null;
abstractInterpreter = null;
}
@Override
public JSTypeRegistry getTypeRegistry() {
if (typeRegistry == null) {
typeRegistry = new JSTypeRegistry(oldErrorReporter, forwardDeclaredTypes);
}
return typeRegistry;
}
@Override
public void forwardDeclareType(String typeName) {
forwardDeclaredTypes.add(typeName);
}
@Override
void setTypeCheckingHasRun(boolean hasRun) {
this.typeCheckingHasRun = hasRun;
}
@Override
boolean hasTypeCheckingRun() {
return this.typeCheckingHasRun;
}
@Override
// Only used by jsdev
public TypedScopeCreator getTypedScopeCreator() {
return getPassConfig().getTypedScopeCreator();
}
@Override
IncrementalScopeCreator getScopeCreator() {
return this.scopeCreator;
}
@Override
void putScopeCreator(IncrementalScopeCreator creator) {
this.scopeCreator = creator;
}
DefaultPassConfig ensureDefaultPassConfig() {
PassConfig passes = getPassConfig().getBasePassConfig();
checkState(
passes instanceof DefaultPassConfig,
"PassConfigs must eventually delegate to the DefaultPassConfig");
return (DefaultPassConfig) passes;
}
public SymbolTable buildKnownSymbolTable() {
SymbolTable symbolTable = new SymbolTable(this, getTypeRegistry());
TypedScopeCreator typedScopeCreator = getTypedScopeCreator();
if (typedScopeCreator != null) {
symbolTable.addScopes(typedScopeCreator.getAllMemoizedScopes());
symbolTable.addSymbolsFrom(typedScopeCreator);
} else {
symbolTable.findScopes(externsRoot, jsRoot);
}
GlobalNamespace globalNamespace =
ensureDefaultPassConfig().getGlobalNamespace();
if (globalNamespace != null) {
symbolTable.addSymbolsFrom(globalNamespace);
}
ReferenceCollectingCallback refCollector =
new ReferenceCollectingCallback(
this, ReferenceCollectingCallback.DO_NOTHING_BEHAVIOR, new SyntacticScopeCreator(this));
refCollector.process(getRoot());
symbolTable.addSymbolsFrom(refCollector);
PreprocessorSymbolTable preprocessorSymbolTable =
ensureDefaultPassConfig().getPreprocessorSymbolTable();
if (preprocessorSymbolTable != null) {
symbolTable.addSymbolsFrom(preprocessorSymbolTable);
}
symbolTable.fillNamespaceReferences();
symbolTable.fillPropertyScopes();
symbolTable.fillThisReferences(externsRoot, jsRoot);
symbolTable.fillPropertySymbols(externsRoot, jsRoot);
symbolTable.fillSuperReferences(externsRoot, jsRoot);
symbolTable.fillJSDocInfo(externsRoot, jsRoot);
symbolTable.fillSymbolVisibility(externsRoot, jsRoot);
symbolTable.removeGeneratedSymbols();
return symbolTable;
}
@Override
public TypedScope getTopScope() {
return getPassConfig().getTopScope();
}
@Override
public ReverseAbstractInterpreter getReverseAbstractInterpreter() {
if (abstractInterpreter == null) {
ChainableReverseAbstractInterpreter interpreter =
new SemanticReverseAbstractInterpreter(getTypeRegistry());
if (options.closurePass) {
interpreter = new ClosureReverseAbstractInterpreter(getTypeRegistry())
.append(interpreter).getFirst();
}
abstractInterpreter = interpreter;
}
return abstractInterpreter;
}
@Override
TypeValidator getTypeValidator() {
if (typeValidator == null) {
typeValidator = new TypeValidator(this);
}
return typeValidator;
}
@Override
public Iterable getTypeMismatches() {
if (this.typeCheckingHasRun) {
return getTypeValidator().getMismatches();
}
throw new RuntimeException("Can't ask for type mismatches before type checking.");
}
@Override
public Iterable getImplicitInterfaceUses() {
if (this.typeCheckingHasRun) {
return getTypeValidator().getImplicitInterfaceUses();
}
throw new RuntimeException("Can't ask for type mismatches before type checking.");
}
public void maybeSetTracker() {
if (!options.getTracerMode().isOn()) {
return;
}
tracker = new PerformanceTracker(externsRoot, jsRoot, options.getTracerMode());
addChangeHandler(tracker.getCodeChangeHandler());
}
//------------------------------------------------------------------------
// Parsing
//------------------------------------------------------------------------
/**
* Parses the externs and main inputs.
*
* @return A synthetic root node whose two children are the externs root
* and the main root
*/
Node parseInputs() {
boolean devMode = options.devMode != DevMode.OFF;
// If old roots exist (we are parsing a second time), detach each of the
// individual file parse trees.
externsRoot.detachChildren();
jsRoot.detachChildren();
scriptNodeByFilename.clear();
Tracer tracer = newTracer(PassNames.PARSE_INPUTS);
beforePass(PassNames.PARSE_INPUTS);
try {
// Parse externs sources.
if (options.numParallelThreads > 1) {
new PrebuildAst(this, options.numParallelThreads).prebuild(externs);
}
for (CompilerInput input : externs) {
Node n = checkNotNull(input.getAstRoot(this));
if (hasErrors()) {
return null;
}
externsRoot.addChildToBack(n);
scriptNodeByFilename.put(input.getSourceFile().getName(), n);
}
if (options.transformAMDToCJSModules) {
processAMDModules(moduleGraph.getAllInputs());
}
if (options.getLanguageIn().toFeatureSet().has(FeatureSet.Feature.MODULES)
|| options.processCommonJSModules) {
ModuleResolverFactory moduleResolverFactory = null;
switch (options.getModuleResolutionMode()) {
case BROWSER:
moduleResolverFactory = BrowserModuleResolver.FACTORY;
break;
case NODE:
// processJsonInputs requires a module loader to already be defined
// so we redefine it afterwards with the package.json inputs
moduleResolverFactory =
new NodeModuleResolver.Factory(processJsonInputs(moduleGraph.getAllInputs()));
break;
case WEBPACK:
moduleResolverFactory = new WebpackModuleResolver.Factory(inputPathByWebpackId);
break;
case BROWSER_WITH_TRANSFORMED_PREFIXES:
moduleResolverFactory =
new BrowserWithTransformedPrefixesModuleResolver.Factory(
options.getBrowserResolverPrefixReplacements());
break;
}
this.moduleLoader =
new ModuleLoader(
null,
options.moduleRoots,
moduleGraph.getAllInputs(),
moduleResolverFactory,
ModuleLoader.PathResolver.RELATIVE,
options.getPathEscaper());
} else {
// Use an empty module loader if we're not actually dealing with modules.
this.moduleLoader = ModuleLoader.EMPTY;
}
if (options.getDependencyOptions().needsManagement()) {
findModulesFromEntryPoints(
options.getLanguageIn().toFeatureSet().has(Feature.MODULES),
options.processCommonJSModules);
} else if (options.needsTranspilationFrom(FeatureSet.ES6_MODULES)
|| options.processCommonJSModules) {
if (options.getLanguageIn().toFeatureSet().has(Feature.MODULES)) {
parsePotentialModules(moduleGraph.getAllInputs());
}
// Build a map of module identifiers for any input which provides no namespace.
// These files could be imported modules which have no exports, but do have side effects.
Map inputModuleIdentifiers = new HashMap<>();
for (CompilerInput input : moduleGraph.getAllInputs()) {
if (input.getKnownProvides().isEmpty()) {
ModuleLoader.ModulePath modPath =
moduleLoader.resolve(input.getSourceFile().getOriginalPath());
inputModuleIdentifiers.put(modPath.toModuleName(), input);
}
}
// Find out if any input attempted to import a module that had no exports.
// In this case we must force module rewriting to occur on the imported file
Map inputsToRewrite = new HashMap<>();
for (CompilerInput input : moduleGraph.getAllInputs()) {
for (String require : input.getKnownRequiredSymbols()) {
if (inputModuleIdentifiers.containsKey(require)
&& !inputsToRewrite.containsKey(require)) {
inputsToRewrite.put(require, inputModuleIdentifiers.get(require));
}
}
}
for (CompilerInput input : inputsToRewrite.values()) {
input.setJsModuleType(CompilerInput.ModuleType.IMPORTED_SCRIPT);
}
}
if (this.moduleLoader != null) {
this.moduleLoader.setErrorHandler(this);
}
orderInputs();
// If in IDE mode, we ignore the error and keep going.
if (hasErrors()) {
return null;
}
// Build the AST.
if (options.numParallelThreads > 1) {
new PrebuildAst(this, options.numParallelThreads).prebuild(moduleGraph.getAllInputs());
}
for (CompilerInput input : moduleGraph.getAllInputs()) {
Node n = checkNotNull(input.getAstRoot(this));
if (devMode) {
runValidityCheck();
if (hasErrors()) {
return null;
}
}
// TODO(johnlenz): we shouldn't need to check both isExternExportsEnabled and
// externExportsPath.
if (options.sourceMapOutputPath != null
|| options.isExternExportsEnabled()
|| options.externExportsPath != null
|| !options.replaceStringsFunctionDescriptions.isEmpty()) {
// Annotate the nodes in the tree with information from the
// input file. This information is used to construct the SourceMap.
SourceInformationAnnotator sia =
new SourceInformationAnnotator(
input.getName(), options.devMode != DevMode.OFF);
NodeTraversal.traverse(this, n, sia);
}
if (NodeUtil.isFromTypeSummary(n)) {
input.setIsExtern();
externsRoot.addChildToBack(n);
} else {
jsRoot.addChildToBack(n);
}
scriptNodeByFilename.put(input.getSourceFile().getName(), n);
}
if (hasErrors()) {
return null;
}
return externAndJsRoot;
} finally {
afterPass(PassNames.PARSE_INPUTS);
stopTracer(tracer, PassNames.PARSE_INPUTS);
}
}
void orderInputsWithLargeStack() {
runInCompilerThread(
() -> {
Tracer tracer = newTracer("orderInputsWithLargeStack");
try {
orderInputs();
} finally {
stopTracer(tracer, "orderInputsWithLargeStack");
}
return null;
});
}
void orderInputs() {
maybeDoThreadedParsing();
// Before dependency pruning, save a copy of the original inputs to use for externs hoisting.
ImmutableList originalInputs = ImmutableList.copyOf(moduleGraph.getAllInputs());
// Externs must be marked before dependency management since it needs to know what is an extern.
markExterns(originalInputs);
// Check if the sources need to be re-ordered.
boolean staleInputs = false;
if (options.getDependencyOptions().needsManagement()) {
for (CompilerInput input : moduleGraph.getAllInputs()) {
// Forward-declare all the provided types, so that they
// are not flagged even if they are dropped from the process.
for (String provide : input.getProvides()) {
forwardDeclareType(provide);
}
}
try {
moduleGraph.manageDependencies(this, options.getDependencyOptions());
staleInputs = true;
} catch (MissingProvideException e) {
report(JSError.make(
MISSING_ENTRY_ERROR, e.getMessage()));
} catch (JSModuleGraph.MissingModuleException e) {
report(JSError.make(
MISSING_MODULE_ERROR, e.getMessage()));
}
}
hoistExterns(originalInputs);
// Manage dependencies may move weak sources around, and end up with empty modules.
fillEmptyModules(getModules());
hoistNoCompileFiles();
if (staleInputs) {
repartitionInputs();
}
}
/**
* Find modules by recursively traversing dependencies starting with the entry points.
*
* Causes a regex parse of every file, and a full parse of every file reachable from the entry
* points (which would be required by later compilation passes regardless).
*
*
If the dependency mode is set to PRUNE_LEGACY, inputs which the regex parse does not
* identify as ES modules and which do not contain any provide statements are considered to be
* additional entry points.
*/
private void findModulesFromEntryPoints(
boolean supportEs6Modules, boolean supportCommonJSModules) {
maybeDoThreadedParsing();
List entryPoints = new ArrayList<>();
Map inputsByProvide = new HashMap<>();
Map inputsByIdentifier = new HashMap<>();
for (CompilerInput input : moduleGraph.getAllInputs()) {
Iterable provides =
Iterables.filter(input.getProvides(), p -> !p.startsWith("module$"));
if (!options.getDependencyOptions().shouldDropMoochers() && Iterables.isEmpty(provides)) {
entryPoints.add(input);
}
inputsByIdentifier.put(
ModuleIdentifier.forFile(input.getPath().toString()).toString(), input);
for (String provide : provides) {
inputsByProvide.put(provide, input);
}
}
for (ModuleIdentifier moduleIdentifier : options.getDependencyOptions().getEntryPoints()) {
CompilerInput input = inputsByProvide.get(moduleIdentifier.toString());
if (input == null) {
input = inputsByIdentifier.get(moduleIdentifier.toString());
}
if (input != null) {
entryPoints.add(input);
}
}
Set workingInputSet = Sets.newHashSet(moduleGraph.getAllInputs());
for (CompilerInput entryPoint : entryPoints) {
findModulesFromInput(
entryPoint,
/* wasImportedByModule = */ false,
workingInputSet,
inputsByIdentifier,
inputsByProvide,
supportEs6Modules,
supportCommonJSModules);
}
}
/** Traverse an input's dependencies to find additional modules. */
private void findModulesFromInput(
CompilerInput input,
boolean wasImportedByModule,
Set inputs,
Map inputsByIdentifier,
Map inputsByProvide,
boolean supportEs6Modules,
boolean supportCommonJSModules) {
if (!inputs.remove(input)) {
// It's possible for a module to be included as both a script
// and a module in the same compilation. In these cases, it should
// be forced to be a module.
if (wasImportedByModule && input.getJsModuleType() == CompilerInput.ModuleType.NONE) {
input.setJsModuleType(CompilerInput.ModuleType.IMPORTED_SCRIPT);
}
return;
}
FindModuleDependencies findDeps =
new FindModuleDependencies(
this, supportEs6Modules, supportCommonJSModules, inputPathByWebpackId);
findDeps.process(checkNotNull(input.getAstRoot(this)));
// If this input was imported by another module, it is itself a module
// so we force it to be detected as such.
if (wasImportedByModule && input.getJsModuleType() == CompilerInput.ModuleType.NONE) {
input.setJsModuleType(CompilerInput.ModuleType.IMPORTED_SCRIPT);
}
this.moduleTypesByName.put(input.getPath().toModuleName(), input.getJsModuleType());
Iterable allDeps =
Iterables.concat(
input.getRequiredSymbols(), input.getDynamicRequires(), input.getTypeRequires());
for (String requiredNamespace : allDeps) {
CompilerInput requiredInput = null;
boolean requiredByModuleImport = false;
if (inputsByProvide.containsKey(requiredNamespace)) {
requiredInput = inputsByProvide.get(requiredNamespace);
} else if (inputsByIdentifier.containsKey(requiredNamespace)) {
requiredByModuleImport = true;
requiredInput = inputsByIdentifier.get(requiredNamespace);
}
if (requiredInput != null) {
findModulesFromInput(
requiredInput,
requiredByModuleImport,
inputs,
inputsByIdentifier,
inputsByProvide,
supportEs6Modules,
supportCommonJSModules);
}
}
}
/** Hoists inputs with the @externs annotation into the externs list. */
void hoistExterns(ImmutableList originalInputs) {
boolean staleInputs = false;
for (CompilerInput input : originalInputs) {
if (hoistIfExtern(input)) {
staleInputs = true;
}
}
if (staleInputs) {
repartitionInputs();
}
}
/**
* Hoists a compiler input to externs if it contains the @externs annotation.
* Return whether or not the given input was hoisted.
*/
private boolean hoistIfExtern(CompilerInput input) {
if (input.getHasExternsAnnotation()) {
// If the input file is explicitly marked as an externs file, then move it out of the main
// JS root and put it with the other externs.
Node root = input.getAstRoot(this);
externsRoot.addChildToBack(root);
scriptNodeByFilename.put(input.getSourceFile().getName(), root);
JSModule module = input.getModule();
if (module != null) {
module.remove(input);
}
externs.add(input);
return true;
}
return false;
}
/**
* Marks inputs with the @externs annotation as an Extern source file type.
* This is so that externs marking can be done before dependency management,
* and externs hoisting done after dependency management.
*/
private void markExterns(ImmutableList originalInputs) {
for (CompilerInput input : originalInputs) {
if (input.getHasExternsAnnotation()) {
input.setIsExtern();
}
}
}
/**
* Hoists inputs with the @nocompile annotation out of the inputs.
*/
void hoistNoCompileFiles() {
boolean staleInputs = false;
maybeDoThreadedParsing();
// Iterate a copy because hoisting modifies what we're iterating over.
for (CompilerInput input : ImmutableList.copyOf(moduleGraph.getAllInputs())) {
if (input.getHasNoCompileAnnotation()) {
input.getModule().remove(input);
staleInputs = true;
}
}
if (staleInputs) {
repartitionInputs();
}
}
private void maybeDoThreadedParsing() {
if (options.numParallelThreads > 1) {
new PrebuildDependencyInfo(options.numParallelThreads).prebuild(moduleGraph.getAllInputs());
}
}
private void repartitionInputs() {
fillEmptyModules(getModules());
rebuildInputsFromModules();
}
/**
* Transforms JSON files to a module export that closure compiler can process and keeps track of
* any "main" entries in package.json files.
*/
Map processJsonInputs(Iterable inputsToProcess) {
RewriteJsonToModule rewriteJson = new RewriteJsonToModule(this);
for (CompilerInput input : inputsToProcess) {
if (!input.getSourceFile().getOriginalPath().endsWith(".json")) {
continue;
}
input.setCompiler(this);
try {
// JSON objects need wrapped in parens to parse properly
input.getSourceFile().setCode("(" + input.getSourceFile().getCode() + ")");
} catch (IOException e) {
continue;
}
Node root = checkNotNull(input.getAstRoot(this));
input.setJsModuleType(CompilerInput.ModuleType.JSON);
rewriteJson.process(null, root);
}
return rewriteJson.getPackageJsonMainEntries();
}
private List parsePotentialModules(Iterable inputsToProcess) {
List filteredInputs = new ArrayList<>();
for (CompilerInput input : inputsToProcess) {
// Only process files that are detected as ES6 modules
if (!options.getDependencyOptions().shouldPrune()
|| !JsFileRegexParser.isSupported()
|| "es6".equals(input.getLoadFlags().get("module"))) {
filteredInputs.add(input);
}
}
if (options.numParallelThreads > 1) {
new PrebuildAst(this, options.numParallelThreads).prebuild(filteredInputs);
}
for (CompilerInput input : filteredInputs) {
input.setCompiler(this);
// Call getRequires to force regex-based dependency parsing to happen.
input.getRequires();
input.setJsModuleType(CompilerInput.ModuleType.ES6);
}
return filteredInputs;
}
/** Transforms AMD to CJS modules */
void processAMDModules(Iterable inputs) {
for (CompilerInput input : inputs) {
input.setCompiler(this);
Node root = checkNotNull(input.getAstRoot(this));
new TransformAMDToCJSModule(this).process(null, root);
}
}
/**
* Allow subclasses to override the default CompileOptions object.
*/
protected CompilerOptions newCompilerOptions() {
return new CompilerOptions();
}
void initCompilerOptionsIfTesting() {
if (options == null) {
// initialization for tests that don't initialize the compiler
// by the normal mechanisms.
initOptions(newCompilerOptions());
}
}
private int syntheticCodeId = 0;
@Override
protected Node parseSyntheticCode(String js) {
return parseSyntheticCode(" [synthetic:" + (++syntheticCodeId) + "] ", js);
}
@Override
Node parseSyntheticCode(String fileName, String js) {
initCompilerOptionsIfTesting();
SourceFile source = SourceFile.fromCode(fileName, js);
addFilesToSourceMap(ImmutableList.of(source));
return parseCodeHelper(source);
}
@Override
@VisibleForTesting
Node parseTestCode(String js) {
initCompilerOptionsIfTesting();
initBasedOnOptions();
return parseCodeHelper(SourceFile.fromCode("[testcode]", js));
}
@Override
@VisibleForTesting
Node parseTestCode(ImmutableList code) {
initCompilerOptionsIfTesting();
initBasedOnOptions();
return parseCodeHelper(
Streams.mapWithIndex(
code.stream(), (value, index) -> SourceFile.fromCode("testcode" + index, value))
.collect(Collectors.toList()));
}
private Node parseCodeHelper(SourceFile src) {
CompilerInput input = new CompilerInput(src);
putCompilerInput(input.getInputId(), input);
Node root = input.getAstRoot(this);
scriptNodeByFilename.put(input.getSourceFile().getName(), root);
return checkNotNull(root);
}
private Node parseCodeHelper(List srcs) {
Node root = IR.root();
for (SourceFile src : srcs) {
root.addChildToBack(parseCodeHelper(src));
}
return root;
}
@Override
ErrorReporter getDefaultErrorReporter() {
return oldErrorReporter;
}
//------------------------------------------------------------------------
// Convert back to source code
//------------------------------------------------------------------------
/**
* Converts the main parse tree back to JS code.
*/
@Override
public String toSource() {
return runInCompilerThread(
() -> {
Tracer tracer = newTracer("toSource");
try {
CodeBuilder cb = new CodeBuilder();
if (jsRoot != null) {
int i = 0;
if (options.shouldPrintExterns()) {
for (Node scriptNode = externsRoot.getFirstChild();
scriptNode != null;
scriptNode = scriptNode.getNext()) {
toSource(cb, i++, scriptNode);
}
}
for (Node scriptNode = jsRoot.getFirstChild();
scriptNode != null;
scriptNode = scriptNode.getNext()) {
toSource(cb, i++, scriptNode);
}
}
return cb.toString();
} finally {
stopTracer(tracer, "toSource");
}
});
}
/**
* Converts the parse tree for a module back to JS code.
*/
public String toSource(final JSModule module) {
return runInCompilerThread(
() -> {
List inputs = module.getInputs();
int numInputs = inputs.size();
if (numInputs == 0) {
return "";
}
CodeBuilder cb = new CodeBuilder();
for (int i = 0; i < numInputs; i++) {
Node scriptNode = inputs.get(i).getAstRoot(Compiler.this);
if (scriptNode == null) {
throw new IllegalArgumentException("Bad module: " + module.getName());
}
toSource(cb, i, scriptNode);
}
return cb.toString();
});
}
/**
* Writes out JS code from a root node. If printing input delimiters, this
* method will attach a comment to the start of the text indicating which
* input the output derived from. If there were any preserve annotations
* within the root's source, they will also be printed in a block comment
* at the beginning of the output.
*/
public void toSource(final CodeBuilder cb,
final int inputSeqNum,
final Node root) {
runInCompilerThread(
() -> {
if (options.printInputDelimiter) {
if ((cb.getLength() > 0) && !cb.endsWith("\n")) {
cb.append("\n"); // Make sure that the label starts on a new line
}
checkState(root.isScript());
String delimiter = options.inputDelimiter;
String inputName = root.getInputId().getIdName();
String sourceName = root.getSourceFileName();
checkState(sourceName != null);
checkState(!sourceName.isEmpty());
delimiter =
delimiter
.replace("%name%", Matcher.quoteReplacement(inputName))
.replace("%num%", String.valueOf(inputSeqNum))
.replace("%n%", "\n");
cb.append(delimiter).append("\n");
}
if (root.getJSDocInfo() != null) {
String license = root.getJSDocInfo().getLicense();
if (license != null && cb.addLicense(license)) {
cb.append("/*\n").append(license).append("*/\n");
}
}
// If there is a valid source map, then indicate to it that the current
// root node's mappings are offset by the given string builder buffer.
if (options.sourceMapOutputPath != null) {
sourceMap.setStartingPosition(cb.getLineIndex(), cb.getColumnIndex());
}
// if LanguageMode is strict, only print 'use strict'
// for the first input file
String code = toSource(root, sourceMap, inputSeqNum == 0);
if (!code.isEmpty()) {
cb.append(code);
// In order to avoid parse ambiguity when files are concatenated
// together, all files should end in a semi-colon. Do a quick
// heuristic check if there's an obvious semi-colon already there.
int length = code.length();
char lastChar = code.charAt(length - 1);
char secondLastChar = length >= 2 ? code.charAt(length - 2) : '\0';
boolean hasSemiColon = lastChar == ';' || (lastChar == '\n' && secondLastChar == ';');
if (!hasSemiColon) {
cb.append(";");
}
}
return null;
});
}
/**
* Generates JavaScript source code for an AST, doesn't generate source
* map info.
*/
@Override
public String toSource(Node n) {
initCompilerOptionsIfTesting();
return toSource(n, null, true);
}
/**
* Generates JavaScript source code for an AST.
*/
private String toSource(Node n, SourceMap sourceMap, boolean firstOutput) {
CodePrinter.Builder builder = new CodePrinter.Builder(n);
builder.setTypeRegistry(getTypeRegistry());
builder.setCompilerOptions(options);
builder.setSourceMap(sourceMap);
builder.setTagAsTypeSummary(!n.isFromExterns() && options.shouldGenerateTypedExterns());
builder.setTagAsStrict(firstOutput && options.shouldEmitUseStrict());
return builder.build();
}
/**
* Converts the parse tree for each input back to JS code.
*/
public String[] toSourceArray() {
return runInCompilerThread(
() -> {
Tracer tracer = newTracer("toSourceArray");
try {
int numInputs = moduleGraph.getInputCount();
String[] sources = new String[numInputs];
CodeBuilder cb = new CodeBuilder();
int i = 0;
for (CompilerInput input : moduleGraph.getAllInputs()) {
Node scriptNode = input.getAstRoot(Compiler.this);
cb.reset();
toSource(cb, i, scriptNode);
sources[i] = cb.toString();
i++;
}
return sources;
} finally {
stopTracer(tracer, "toSourceArray");
}
});
}
/**
* Converts the parse tree for each input in a module back to JS code.
*/
public String[] toSourceArray(final JSModule module) {
return runInCompilerThread(
() -> {
List inputs = module.getInputs();
int numInputs = inputs.size();
if (numInputs == 0) {
return new String[0];
}
String[] sources = new String[numInputs];
CodeBuilder cb = new CodeBuilder();
for (int i = 0; i < numInputs; i++) {
Node scriptNode = inputs.get(i).getAstRoot(Compiler.this);
if (scriptNode == null) {
throw new IllegalArgumentException("Bad module input: " + inputs.get(i).getName());
}
cb.reset();
toSource(cb, i, scriptNode);
sources[i] = cb.toString();
}
return sources;
});
}
/**
* Stores a buffer of text to which more can be appended. This is just like a
* StringBuilder except that we also track the number of lines.
*/
public static class CodeBuilder {
private final StringBuilder sb = new StringBuilder();
private int lineCount = 0;
private int colCount = 0;
private final Set uniqueLicenses = new HashSet<>();
/** Removes all text, but leaves the line count unchanged. */
void reset() {
sb.setLength(0);
}
/** Appends the given string to the text buffer. */
CodeBuilder append(String str) {
sb.append(str);
// Adjust the line and column information for the new text.
int index = -1;
int lastIndex = index;
while ((index = str.indexOf('\n', index + 1)) >= 0) {
++lineCount;
lastIndex = index;
}
if (lastIndex == -1) {
// No new lines, append the new characters added.
colCount += str.length();
} else {
colCount = str.length() - (lastIndex + 1);
}
return this;
}
/** Returns all text in the text buffer. */
@Override
public String toString() {
return sb.toString();
}
/** Returns the length of the text buffer. */
public int getLength() {
return sb.length();
}
/** Returns the (zero-based) index of the last line in the text buffer. */
int getLineIndex() {
return lineCount;
}
/** Returns the (zero-based) index of the last column in the text buffer. */
int getColumnIndex() {
return colCount;
}
/** Determines whether the text ends with the given suffix. */
boolean endsWith(String suffix) {
return (sb.length() > suffix.length())
&& suffix.equals(sb.substring(sb.length() - suffix.length()));
}
/** Adds a license and returns whether it is unique (has yet to be encountered). */
boolean addLicense(String license) {
return uniqueLicenses.add(license);
}
}
//------------------------------------------------------------------------
// Optimizations
//------------------------------------------------------------------------
void performOptimizations() {
checkState(options.shouldOptimize());
List optimizations = getPassConfig().getOptimizations();
if (optimizations.isEmpty()) {
return;
}
phaseOptimizer = createPhaseOptimizer();
phaseOptimizer.consume(optimizations);
phaseOptimizer.process(externsRoot, jsRoot);
phaseOptimizer = null;
}
@Override
void setCssRenamingMap(CssRenamingMap map) {
options.cssRenamingMap = map;
}
@Override
CssRenamingMap getCssRenamingMap() {
return options.cssRenamingMap;
}
/** Control Flow Analysis. */
ControlFlowGraph computeCFG() {
logger.fine("Computing Control Flow Graph");
Tracer tracer = newTracer("computeCFG");
ControlFlowAnalysis cfa = new ControlFlowAnalysis(this, true, false);
process(cfa);
stopTracer(tracer, "computeCFG");
return cfa.getCfg();
}
@Override
void prepareAst(Node root) {
CompilerPass pass = new PrepareAst(this);
pass.process(null, root);
}
protected final RecentChange recentChange = new RecentChange();
private final List codeChangeHandlers = new ArrayList<>();
private final Map, IndexProvider> indexProvidersByType =
new LinkedHashMap<>();
/** Name of the synthetic input that holds synthesized externs. */
static final String SYNTHETIC_EXTERNS = "{SyntheticVarsDeclar}";
/**
* Name of the synthetic input that holds synthesized externs which
* must be at the end of the externs AST.
*/
static final String SYNTHETIC_EXTERNS_AT_END = "{SyntheticVarsAtEnd}";
/** Prefix of the generated file name for synthetic injected libraries */
static final String SYNTHETIC_CODE_PREFIX = " [synthetic:";
private static final InputId SYNTHETIC_CODE_INPUT_ID =
new InputId(SYNTHETIC_CODE_PREFIX + "input]");
private CompilerInput synthesizedExternsInput = null;
private CompilerInput synthesizedExternsInputAtEnd = null;
private CompilerInput synthesizedCodeInput = null;
private ImmutableMap defaultDefineValues = ImmutableMap.of();
@Override
void addChangeHandler(CodeChangeHandler handler) {
codeChangeHandlers.add(handler);
}
@Override
void removeChangeHandler(CodeChangeHandler handler) {
codeChangeHandlers.remove(handler);
}
@Override
void addIndexProvider(IndexProvider indexProvider) {
Class type = indexProvider.getType();
if (indexProvidersByType.put(type, indexProvider) != null) {
throw new IllegalStateException(
"A provider is already registered for index of type " + type.getSimpleName());
}
}
@SuppressWarnings("unchecked")
@Override
T getIndex(Class key) {
IndexProvider indexProvider = (IndexProvider) indexProvidersByType.get(key);
if (indexProvider == null) {
return null;
}
return indexProvider.get();
}
protected Node getExternsRoot() {
return externsRoot;
}
@Override
protected Node getJsRoot() {
return jsRoot;
}
/**
* Some tests don't want to call the compiler "wholesale," they may not want
* to call check and/or optimize. With this method, tests can execute custom
* optimization loops.
*/
@VisibleForTesting
void setPhaseOptimizer(PhaseOptimizer po) {
this.phaseOptimizer = po;
}
@Override
public int getChangeStamp() {
return changeStamp;
}
@Override
List getChangedScopeNodesForPass(String passName) {
List changedScopeNodes = changeTimeline.getSince(passName);
changeTimeline.mark(passName);
return changedScopeNodes;
}
@Override
List getDeletedScopeNodesForPass(String passName) {
List deletedScopeNodes = deleteTimeline.getSince(passName);
deleteTimeline.mark(passName);
return deletedScopeNodes;
}
@Override
public void incrementChangeStamp() {
changeStamp++;
}
private Node getChangeScopeForNode(Node n) {
/**
* Compiler change reporting usually occurs after the AST change has already occurred. In the
* case of node removals those nodes are already removed from the tree and so have no parent
* chain to walk. In these situations changes are reported instead against what (used to be)
* their parent. If that parent is itself a script node then it's important to be able to
* recognize it as the enclosing scope without first stepping to its parent as well.
*/
if (n.isScript()) {
return n;
}
Node enclosingScopeNode = NodeUtil.getEnclosingChangeScopeRoot(n.getParent());
if (enclosingScopeNode == null) {
throw new IllegalStateException(
"An enclosing scope is required for change reports but node " + n + " doesn't have one.");
}
return enclosingScopeNode;
}
private void recordChange(Node n) {
if (n.isDeleted()) {
// Some complicated passes (like SmartNameRemoval) might both change and delete a scope in
// the same pass, and they might even perform the change after the deletion because of
// internal queueing. Just ignore the spurious attempt to mark changed after already marking
// deleted. There's no danger of deleted nodes persisting in the AST since this is enforced
// separately in ChangeVerifier.
return;
}
n.setChangeTime(changeStamp);
// Every code change happens at a different time
changeStamp++;
changeTimeline.add(n);
}
@Override
boolean hasScopeChanged(Node n) {
if (phaseOptimizer == null) {
return true;
}
return phaseOptimizer.hasScopeChanged(n);
}
@Override
public void reportChangeToChangeScope(Node changeScopeRoot) {
checkState(changeScopeRoot.isScript() || changeScopeRoot.isFunction());
recordChange(changeScopeRoot);
notifyChangeHandlers();
}
@Override
public void reportFunctionDeleted(Node n) {
checkState(n.isFunction());
n.setDeleted(true);
changeTimeline.remove(n);
deleteTimeline.add(n);
}
@Override
public void reportChangeToEnclosingScope(Node n) {
recordChange(getChangeScopeForNode(n));
notifyChangeHandlers();
}
private void notifyChangeHandlers() {
for (CodeChangeHandler handler : codeChangeHandlers) {
handler.reportChange();
}
}
@Override
public CodingConvention getCodingConvention() {
CodingConvention convention = options.getCodingConvention();
convention = convention != null ? convention : defaultCodingConvention;
return convention;
}
private Config.LanguageMode getParserConfigLanguageMode(
CompilerOptions.LanguageMode languageMode) {
switch (languageMode) {
case ECMASCRIPT3:
return Config.LanguageMode.ECMASCRIPT3;
case ECMASCRIPT5:
case ECMASCRIPT5_STRICT:
return Config.LanguageMode.ECMASCRIPT5;
case ECMASCRIPT_2015:
return Config.LanguageMode.ECMASCRIPT6;
case ECMASCRIPT6_TYPED:
return Config.LanguageMode.TYPESCRIPT;
case ECMASCRIPT_2016:
return Config.LanguageMode.ECMASCRIPT7;
case ECMASCRIPT_2017:
return Config.LanguageMode.ECMASCRIPT8;
case ECMASCRIPT_2018:
return Config.LanguageMode.ECMASCRIPT_2018;
case ECMASCRIPT_2019:
return Config.LanguageMode.ECMASCRIPT_2019;
case ECMASCRIPT_2020:
return Config.LanguageMode.ECMASCRIPT_2020;
case UNSUPPORTED:
return Config.LanguageMode.UNSUPPORTED;
case ECMASCRIPT_NEXT:
return Config.LanguageMode.ES_NEXT;
case ECMASCRIPT_NEXT_IN:
return Config.LanguageMode.ES_NEXT_IN;
default:
throw new IllegalStateException("Unexpected language mode: "
+ options.getLanguageIn());
}
}
@Override
Config getParserConfig(ConfigContext context) {
if (parserConfig == null || externsParserConfig == null) {
synchronized (this) {
if (parserConfig == null) {
Config.LanguageMode configLanguageMode = getParserConfigLanguageMode(
options.getLanguageIn());
Config.StrictMode strictMode =
options.expectStrictModeInput() ? Config.StrictMode.STRICT : Config.StrictMode.SLOPPY;
parserConfig = createConfig(configLanguageMode, strictMode);
// Externs must always be parsed with at least ES5 language mode.
externsParserConfig =
configLanguageMode.equals(Config.LanguageMode.ECMASCRIPT3)
? createConfig(Config.LanguageMode.ECMASCRIPT5, strictMode)
: parserConfig;
}
}
}
switch (context) {
case EXTERNS:
return externsParserConfig;
default:
return parserConfig;
}
}
protected Config createConfig(Config.LanguageMode mode, Config.StrictMode strictMode) {
Config config =
ParserRunner.createConfig(
mode,
options.isParseJsDocDocumentation(),
options.canContinueAfterErrors()
? Config.RunMode.KEEP_GOING
: Config.RunMode.STOP_AFTER_ERROR,
options.extraAnnotationNames,
options.parseInlineSourceMaps,
strictMode);
return config;
}
// ------------------------------------------------------------------------
// Error reporting
// ------------------------------------------------------------------------
/**
* The warning classes that are available from the command-line, and are suppressible by the
* {@code @suppress} annotation.
*/
public DiagnosticGroups getDiagnosticGroups() {
return new DiagnosticGroups();
}
@Override
public void report(JSError error) {
CheckLevel level = error.getDefaultLevel();
if (warningsGuard != null) {
CheckLevel newLevel = warningsGuard.level(error);
if (newLevel != null) {
level = newLevel;
}
}
if (level.isOn()) {
initCompilerOptionsIfTesting();
if (getOptions().errorHandler != null) {
getOptions().errorHandler.report(level, error);
}
errorManager.report(level, error);
}
}
@Override
public void report(CheckLevel ignoredLevel, JSError error) {
report(error);
}
@Override
public CheckLevel getErrorLevel(JSError error) {
checkNotNull(options);
return warningsGuard.level(error);
}
/**
* Report an internal error.
*/
@Override
void throwInternalError(String message, Throwable cause) {
String finalMessage = "INTERNAL COMPILER ERROR.\nPlease report this problem.\n\n" + message;
RuntimeException e = new RuntimeException(finalMessage, cause);
if (cause != null) {
e.setStackTrace(cause.getStackTrace());
}
throw e;
}
/**
* Gets the number of errors.
*/
public int getErrorCount() {
return errorManager.getErrorCount();
}
/**
* Gets the number of warnings.
*/
public int getWarningCount() {
return errorManager.getWarningCount();
}
@Override
boolean hasHaltingErrors() {
return !getOptions().canContinueAfterErrors() && errorManager.hasHaltingErrors();
}
/**
* Consults the {@link ErrorManager} to see if we've encountered errors
* that should halt compilation.
*
* If {@link CompilerOptions#canContinueAfterErrors} is {@code true}, this function
* always returns {@code false} without consulting the error manager. The
* error manager will continue to be told about new errors and warnings, but
* the compiler will complete compilation of all inputs.
*/
public boolean hasErrors() {
return hasHaltingErrors();
}
@Override
SourceFile getSourceFileByName(String sourceName) {
// Here we assume that the source name is the input name, this
// is true of JavaScript parsed from source.
if (sourceName != null) {
CompilerInput input = inputsById.get(new InputId(sourceName));
if (input != null) {
return input.getSourceFile();
}
// Alternatively, the sourceName might have been reverse-mapped by
// an input source-map, so let's look in our sourcemap original sources.
return sourceMapOriginalSources.get(sourceName);
}
return null;
}
public CharSequence getSourceFileContentByName(String sourceName) {
SourceFile file = getSourceFileByName(sourceName);
checkNotNull(file);
try {
return file.getCode();
} catch (IOException e) {
return null;
}
}
@Override
public void addInputSourceMap(String sourceFileName, SourceMapInput inputSourceMap) {
inputSourceMaps.put(sourceFileName, inputSourceMap);
if (options.sourceMapIncludeSourcesContent && sourceMap != null) {
addSourceMapSourceFiles(inputSourceMap);
}
}
/**
* Adds file name to content mappings for all sources found in a source map.
* This is used to populate sourcesContent array in the output source map
* even for sources embedded in the input source map.
*/
private synchronized void addSourceMapSourceFiles(SourceMapInput inputSourceMap) {
// synchronized annotation guards concurrent access to sourceMap during parsing.
SourceMapConsumerV3 consumer = inputSourceMap.getSourceMap(errorManager);
if (consumer == null) {
return;
}
Collection sourcesContent = consumer.getOriginalSourcesContent();
if (sourcesContent == null) {
return;
}
Iterator content = sourcesContent.iterator();
Iterator sources = consumer.getOriginalSources().iterator();
while (sources.hasNext() && content.hasNext()) {
String code = content.next();
SourceFile source = SourceMapResolver.getRelativePath(
inputSourceMap.getOriginalPath(), sources.next());
if (source != null) {
sourceMap.addSourceFile(source.getOriginalPath(), code);
}
}
if (sources.hasNext() || content.hasNext()) {
throw new RuntimeException(
"Source map's \"sources\" and \"sourcesContent\" lengths do not match.");
}
}
@Override
@Nullable
public OriginalMapping getSourceMapping(String sourceName, int lineNumber, int columnNumber) {
if (sourceName == null) {
return null;
}
SourceMapInput sourceMap = inputSourceMaps.get(sourceName);
if (sourceMap == null) {
return null;
}
// JSCompiler uses 1-indexing for lineNumber and 0-indexing for columnNumber.
// Sourcemaps use 1-indexing for both.
SourceMapConsumerV3 consumer = sourceMap.getSourceMap(errorManager);
if (consumer == null) {
return null;
}
OriginalMapping result = consumer.getMappingForLine(lineNumber, columnNumber + 1);
if (result == null) {
return null;
}
// First check to see if the original file was loaded from an input source map.
String sourceMapOriginalPath = sourceMap.getOriginalPath();
String resultOriginalPath = result.getOriginalFile();
final String relativePath;
// Resolving the paths to a source file is expensive, so check the cache first.
if (sourceMapOriginalPath.equals(resolvedSourceMap.originalPath)
&& resultOriginalPath.equals(resolvedSourceMap.sourceMapPath)) {
relativePath = resolvedSourceMap.relativePath;
} else {
relativePath = resolveSibling(sourceMapOriginalPath, resultOriginalPath);
SourceFile source = getSourceFileByName(relativePath);
if (source == null && !isNullOrEmpty(resultOriginalPath)) {
source =
SourceMapResolver.getRelativePath(
sourceMap.getOriginalPath(), result.getOriginalFile());
if (source != null) {
sourceMapOriginalSources.putIfAbsent(relativePath, source);
}
}
// Cache this resolved source for the next caller.
resolvedSourceMap.originalPath = sourceMapOriginalPath;
resolvedSourceMap.sourceMapPath = resultOriginalPath;
resolvedSourceMap.relativePath = relativePath;
}
return result.toBuilder()
.setOriginalFile(relativePath)
.setColumnPosition(result.getColumnPosition() - 1)
.build();
}
@Override
public String getSourceLine(String sourceName, int lineNumber) {
if (lineNumber < 1) {
return null;
}
SourceFile input = getSourceFileByName(sourceName);
if (input != null) {
return input.getLine(lineNumber);
}
return null;
}
@Override
public Region getSourceLines(String sourceName, int lineNumber, int length) {
if (lineNumber < 1) {
return null;
}
SourceFile input = getSourceFileByName(sourceName);
if (input != null) {
return input.getLines(lineNumber, length);
}
return null;
}
@Override
public Region getSourceRegion(String sourceName, int lineNumber) {
if (lineNumber < 1) {
return null;
}
SourceFile input = getSourceFileByName(sourceName);
if (input != null) {
return input.getRegion(lineNumber);
}
return null;
}
// ------------------------------------------------------------------------
// Package-private and Protected helpers
// ------------------------------------------------------------------------
@Override
protected Node getNodeForCodeInsertion(@Nullable JSModule module) {
if (synthesizedCodeInput != null) {
return synthesizedCodeInput.getAstRoot(this);
}
if (module == null) {
if (moduleGraph == null || Iterables.isEmpty(moduleGraph.getAllInputs())) {
throw new IllegalStateException("No inputs");
}
CompilerInput firstInput = Iterables.getFirst(moduleGraph.getAllInputs(), null);
// TODO(lharker): add `checkNotModule(`.
return firstInput.getAstRoot(this);
}
List moduleInputs = module.getInputs();
if (!moduleInputs.isEmpty()) {
return checkNotModule(
moduleInputs.get(0).getAstRoot(this), "Cannot insert code into a module");
}
throw new IllegalStateException("Root module has no inputs");
}
public SourceMap getSourceMap() {
return sourceMap;
}
/**
* Ids for cross-module method stubbing, so that each method has
* a unique id.
*/
private IdGenerator crossModuleIdGenerator =
new IdGenerator();
/**
* Keys are arguments passed to getCssName() found during compilation; values
* are the number of times the key appeared as an argument to getCssName().
*/
private Map cssNames = null;
/** The variable renaming map */
private VariableMap variableMap = null;
/** The property renaming map */
private VariableMap propertyMap = null;
/** The naming map for anonymous functions */
private VariableMap anonymousFunctionNameMap = null;
/** String replacement map */
private VariableMap stringMap = null;
/** Mapping for Instrumentation parameter encoding */
private VariableMap instrumentationMapping = null;
/** Id generator map */
private String idGeneratorMap = null;
/** Names exported by goog.exportSymbol. */
private final Set exportedNames = new LinkedHashSet<>();
@Override
public void setVariableMap(VariableMap variableMap) {
this.variableMap = variableMap;
}
VariableMap getVariableMap() {
return variableMap;
}
@Override
public void setPropertyMap(VariableMap propertyMap) {
this.propertyMap = propertyMap;
}
VariableMap getPropertyMap() {
return this.propertyMap;
}
@Override
public void setStringMap(VariableMap stringMap) {
this.stringMap = stringMap;
}
@Override
public void setCssNames(Map cssNames) {
this.cssNames = cssNames;
}
@Override
public void setIdGeneratorMap(String serializedIdMappings) {
this.idGeneratorMap = serializedIdMappings;
}
@Override
public IdGenerator getCrossModuleIdGenerator() {
return crossModuleIdGenerator;
}
@Override
public void setAnonymousFunctionNameMap(VariableMap functionMap) {
this.anonymousFunctionNameMap = functionMap;
}
VariableMap getStringMap() {
return this.stringMap;
}
@Override
public void setInstrumentationMapping(VariableMap instrumentationMapping) {
this.instrumentationMapping = instrumentationMapping;
}
public VariableMap getInstrumentationMapping() {
return this.instrumentationMapping;
}
@Override
public void addExportedNames(Set exportedNames) {
this.exportedNames.addAll(exportedNames);
}
@Override
public Set getExportedNames() {
return exportedNames;
}
@Override
public CompilerOptions getOptions() {
return options;
}
/**
* Sets the logging level for the com.google.javascript.jscomp package.
*/
public static void setLoggingLevel(Level level) {
logger.setLevel(level);
}
/** Gets the DOT graph of the AST generated at the end of compilation. */
public String getAstDotGraph() throws IOException {
if (jsRoot != null) {
ControlFlowAnalysis cfa = new ControlFlowAnalysis(this, true, false);
cfa.process(null, jsRoot);
return DotFormatter.toDot(jsRoot, cfa.getCfg());
} else {
return "";
}
}
@Override
public ErrorManager getErrorManager() {
if (options == null) {
initOptions(new CompilerOptions());
}
return errorManager;
}
@Override
Iterable getInputsInOrder() {
return moduleGraph.getAllInputs();
}
@Override
int getNumberOfInputs() {
// In some testing cases inputs will be null, but obviously there must be at least one input.
// The intended use of this method is to allow passes to estimate how much memory they will
// need for data structures, so it's not necessary that the returned value be exactly right
// in the corner cases where inputs ends up being null.
return (moduleGraph != null) ? moduleGraph.getInputCount() : 1;
}
/**
* Returns an unmodifiable view of the compiler inputs indexed by id.
*/
public Map getInputsById() {
return Collections.unmodifiableMap(inputsById);
}
/**
* Gets the externs in the order in which they are being processed.
*/
List getExternsInOrder() {
return Collections.unmodifiableList(externs);
}
@VisibleForTesting
List getInputsForTesting() {
return moduleGraph != null ? ImmutableList.copyOf(moduleGraph.getAllInputs()) : null;
}
@VisibleForTesting
List getExternsForTesting() {
return externs;
}
@Override
boolean hasRegExpGlobalReferences() {
return hasRegExpGlobalReferences;
}
@Override
void setHasRegExpGlobalReferences(boolean references) {
hasRegExpGlobalReferences = references;
}
@Override
void updateGlobalVarReferences(Map refMapPatch,
Node collectionRoot) {
checkState(collectionRoot.isScript() || collectionRoot.isRoot());
if (globalRefMap == null) {
globalRefMap = new GlobalVarReferenceMap(getInputsInOrder(),
getExternsInOrder());
}
globalRefMap.updateGlobalVarReferences(refMapPatch, collectionRoot);
}
@Override
GlobalVarReferenceMap getGlobalVarReferences() {
return globalRefMap;
}
@Override
CompilerInput getSynthesizedExternsInput() {
if (synthesizedExternsInput == null) {
synthesizedExternsInput = newExternInput(SYNTHETIC_EXTERNS, SyntheticExternsPosition.START);
}
return synthesizedExternsInput;
}
@Override
InputId getSyntheticCodeInputId() {
return SYNTHETIC_CODE_INPUT_ID;
}
@Override
void initializeSyntheticCodeInput() {
checkState(synthesizedCodeInput == null, "Already initialized synthetic input");
SourceAst ast = new SyntheticAst(SYNTHETIC_CODE_INPUT_ID.getIdName());
if (inputsById.containsKey(ast.getInputId())) {
throw new IllegalStateException("Conflicting synthetic id name");
}
CompilerInput input = new CompilerInput(ast, false);
jsRoot.addChildToFront(checkNotNull(ast.getAstRoot(this)));
JSModule firstModule = Iterables.getFirst(getModules(), null);
if (firstModule.getName().equals(JSModule.STRONG_MODULE_NAME)) {
firstModule.add(input);
}
input.setModule(firstModule);
putCompilerInput(input.getInputId(), input);
synthesizedCodeInput = input;
commentsPerFile.put(SYNTHETIC_CODE_INPUT_ID.getIdName(), ImmutableList.of());
reportChangeToChangeScope(ast.getAstRoot(this));
}
@Override
void removeSyntheticCodeInput() {
this.removeSyntheticCodeInput(/* mergeContentIntoFirstInput= */ false);
}
@Override
void mergeSyntheticCodeInput() {
this.removeSyntheticCodeInput(/* mergeContentIntoFirstInput= */ true);
}
/**
* Deletes the synthesized code input and optionally moves all its subtree contents into the first
* non-synthetic input
*/
private void removeSyntheticCodeInput(boolean mergeContentIntoFirstInput) {
checkNotNull(synthesizedCodeInput, "Never initialized the synthetic input");
CompilerInput input = synthesizedCodeInput;
Node astRoot = input.getAstRoot(this);
checkState(astRoot.isFirstChildOf(jsRoot));
checkState(SYNTHETIC_CODE_INPUT_ID.equals(input.getInputId()));
if (mergeContentIntoFirstInput && astRoot.hasChildren()) {
// If we've inserted anything into the synthetic AST, move it into the top of the next script.
Node next = astRoot.getNext();
checkNotNull(next, "Must provide at least one source");
checkNotModule(
next, "Cannot remove synthetic code input until modules are rewritten: %s", next);
next.addChildrenToFront(astRoot.removeChildren());
reportChangeToChangeScope(next);
}
jsRoot.removeChild(astRoot);
// bookkeeping to mark scopes and nodes as deleted
reportChangeToChangeScope(astRoot);
astRoot.setDeleted(true);
NodeUtil.markFunctionsDeleted(astRoot, this);
input.getModule().remove(input);
inputsById.remove(input.getInputId());
this.synthesizedCodeInput = null;
}
@Override
CompilerInput getSynthesizedExternsInputAtEnd() {
if (synthesizedExternsInputAtEnd == null) {
synthesizedExternsInputAtEnd = newExternInput(
SYNTHETIC_EXTERNS_AT_END, SyntheticExternsPosition.END);
}
return synthesizedExternsInputAtEnd;
}
@Override
public double getProgress() {
return progress;
}
@Override
String getLastPassName() {
return lastPassName;
}
@Override
void setProgress(double newProgress, String passName) {
this.lastPassName = passName;
if (newProgress > 1.0) {
progress = 1.0;
} else {
progress = newProgress;
}
}
@Override
void setExternProperties(Set externProperties) {
this.externProperties = externProperties;
}
@Override
Set getExternProperties() {
return externProperties;
}
@Override
AccessorSummary getAccessorSummary() {
return accessorSummary;
}
@Override
void setAccessorSummary(AccessorSummary summary) {
this.accessorSummary = summary;
}
/**
* Replaces one file in a hot-swap mode. The given JsAst should be made
* from a new version of a file that already was present in the last compile
* call. If the file is new, this will silently ignored.
*
* @param ast the ast of the file that is being replaced
*/
public void replaceScript(JsAst ast) {
CompilerInput input = this.getInput(ast.getInputId());
if (!replaceIncrementalSourceAst(ast)) {
return;
}
Node originalRoot = checkNotNull(input.getAstRoot(this));
processNewScript(ast, originalRoot);
}
/**
* Adds a new Script AST to the compile state. If a script for the same file
* already exists the script will not be added, instead a call to
* #replaceScript should be used.
*
* @param ast the ast of the new file
*/
public void addNewScript(JsAst ast) {
if (!addNewSourceAst(ast)) {
return;
}
Node emptyScript = new Node(Token.SCRIPT);
InputId inputId = ast.getInputId();
emptyScript.setInputId(inputId);
emptyScript.setStaticSourceFile(
SourceFile.fromCode(inputId.getIdName(), ""));
processNewScript(ast, emptyScript);
}
private void processNewScript(JsAst ast, Node originalRoot) {
setFeatureSet(options.getLanguageIn().toFeatureSet());
Node js = checkNotNull(ast.getAstRoot(this));
runHotSwap(originalRoot, js, this.getCleanupPassConfig());
// NOTE: If hot swap passes that use GlobalNamespace are added, we will need
// to revisit this approach to clearing GlobalNamespaces
runHotSwapPass(null, null, ensureDefaultPassConfig().garbageCollectChecks);
// Type information is not reliable for hotswap runs.
this.typeCheckingHasRun = false;
this.removeSyntheticVarsInput();
runHotSwap(originalRoot, js, this.ensureDefaultPassConfig());
}
/**
* Execute the passes from a PassConfig instance over a single replaced file.
*/
private void runHotSwap(
Node originalRoot, Node js, PassConfig passConfig) {
for (PassFactory passFactory : passConfig.getChecks()) {
runHotSwapPass(originalRoot, js, passFactory);
}
}
private void runHotSwapPass(Node originalRoot, Node js, PassFactory passFactory) {
if (!passFactory.isHotSwapable()) {
return;
}
HotSwapCompilerPass pass = (HotSwapCompilerPass) passFactory.create(this);
if (logger.isLoggable(Level.INFO)) {
logger.info("Performing HotSwap for pass " + passFactory.getName());
}
pass.hotSwapScript(js, originalRoot);
}
private PassConfig getCleanupPassConfig() {
return new CleanupPasses(getOptions());
}
private void removeSyntheticVarsInput() {
String sourceName = Compiler.SYNTHETIC_EXTERNS;
removeExternInput(new InputId(sourceName));
}
@Override
protected Node ensureLibraryInjected(String resourceName, boolean force) {
boolean shouldInject =
force || (!options.skipNonTranspilationPasses && !options.preventLibraryInjection);
if (injectedLibraries.containsKey(resourceName) || !shouldInject) {
return lastInjectedLibrary;
}
checkState(!hasTypeCheckingRun(), "runtime library injected after type checking");
checkState(!getLifeCycleStage().isNormalized(), "runtime library injected after normalization");
// Load/parse the code.
String originalCode = ResourceLoader.loadTextResource(
Compiler.class, "js/" + resourceName + ".js");
Node ast = parseSyntheticCode(SYNTHETIC_CODE_PREFIX + resourceName + "] ", originalCode);
// Look for string literals of the form 'require foo bar' or 'declare baz''.
// As we process each one, remove it from its parent.
for (Node node = ast.getFirstChild();
node != null && node.isExprResult() && node.getFirstChild().isString();
node = ast.getFirstChild()) {
String directive = node.getFirstChild().getString();
List words = Splitter.on(' ').limit(2).splitToList(directive);
switch (words.get(0)) {
case "use":
// 'use strict' is ignored (and deleted).
break;
case "require":
// 'require lib'; pulls in the named library before this one.
ensureLibraryInjected(words.get(1), force);
break;
default:
throw new RuntimeException("Bad directive: " + directive);
}
ast.removeChild(node);
}
// Insert the code immediately after the last-inserted runtime library.
Node lastChild = ast.getLastChild();
for (Node child = ast.getFirstChild(); child != null; child = child.getNext()) {
NodeUtil.markNewScopesChanged(child, this);
}
Node firstChild = ast.removeChildren();
if (firstChild == null) {
// Handle require-only libraries.
return lastInjectedLibrary;
}
Node parent = getNodeForCodeInsertion(null);
if (lastInjectedLibrary == null) {
parent.addChildrenToFront(firstChild);
} else {
parent.addChildrenAfter(firstChild, lastInjectedLibrary);
}
lastInjectedLibrary = lastChild;
injectedLibraries.put(resourceName, lastChild);
reportChangeToEnclosingScope(parent);
return lastChild;
}
/** Returns the compiler version baked into the jar. */
@GwtIncompatible("java.util.ResourceBundle")
public static String getReleaseVersion() {
ResourceBundle config = ResourceBundle.getBundle(CONFIG_RESOURCE);
return config.getString("compiler.version");
}
/** Returns the compiler date baked into the jar. */
@GwtIncompatible("java.util.ResourceBundle")
public static String getReleaseDate() {
ResourceBundle config = ResourceBundle.getBundle(CONFIG_RESOURCE);
return config.getString("compiler.date");
}
@Override
void addComments(String filename, List comments) {
if (!getOptions().preservesDetailedSourceInfo()) {
throw new UnsupportedOperationException(
"addComments may only be called in IDE mode.");
}
commentsPerFile.put(filename, comments);
}
@Override
public List getComments(String filename) {
if (!getOptions().preservesDetailedSourceInfo()) {
throw new UnsupportedOperationException(
"getComments may only be called in IDE mode.");
}
return commentsPerFile.get(filename);
}
@Override
void setDefaultDefineValues(ImmutableMap values) {
this.defaultDefineValues = values;
}
@Override
ImmutableMap getDefaultDefineValues() {
return this.defaultDefineValues;
}
@Override
public ModuleLoader getModuleLoader() {
return moduleLoader;
}
private synchronized void addFilesToSourceMap(Iterable files) {
// synchronized annotation guards concurrent access to sourceMap during parsing.
if (getOptions().sourceMapIncludeSourcesContent && getSourceMap() != null) {
for (SourceFile file : files) {
try {
getSourceMap().addSourceFile(file.getName(), file.getCode());
} catch (IOException e) {
throw new RuntimeException("Cannot read code of a source map's source file.", e);
}
}
}
}
private void renameModules(List newModules, List deserializedModules) {
if (newModules == null) {
return;
}
if (newModules.size() != deserializedModules.size()) {
report(JSError.make(INCONSISTENT_MODULE_DEFINITIONS));
return;
}
for (int i = 0; i < deserializedModules.size(); i++) {
JSModule deserializedModule = deserializedModules.get(i);
JSModule newModule = newModules.get(i);
deserializedModule.setName(newModule.getName());
}
return;
}
public void initWebpackMap(ImmutableMap inputPathByWebpackId) {
this.inputPathByWebpackId = inputPathByWebpackId;
}
protected CompilerExecutor createCompilerExecutor() {
return new CompilerExecutor();
}
protected CompilerExecutor getCompilerExecutor() {
return compilerExecutor;
}
/**
* Serializable state of the compiler.
*/
private static class CompilerState implements Serializable {
private final Node externAndJsRoot;
private final Node externsRoot;
private final Node jsRoot;
private final FeatureSet featureSet;
private final List externs;
private final Map scriptNodeByFilename;
private final Map inputsById;
private final JSTypeRegistry typeRegistry;
private final TypeValidator typeValidator;
private final boolean typeCheckingHasRun;
private final CompilerInput synthesizedExternsInput;
private final CompilerInput synthesizedExternsInputAtEnd;
private final Map injectedLibraries;
private final Node lastInjectedLibrary;
private final boolean hasRegExpGlobalReferences;
private final LifeCycleStage lifeCycleStage;
private final Set externProperties;
private final ImmutableList errors;
private final ImmutableList warnings;
private final JSModuleGraph moduleGraph;
private final int uniqueNameId;
private final UniqueIdSupplier uniqueIdSupplier;
private final Set exportedNames;
private final Map cssNames;
private final VariableMap variableMap;
private final VariableMap propertyMap;
private final VariableMap anonymousFunctionaMap;
private final VariableMap stringMap;
private final String idGeneratorMap;
private final IdGenerator crossModuleIdGenerator;
private final ImmutableMap defaultDefineValues;
private final Map annotationMap;
private final ConcurrentHashMap inputSourceMaps;
private final int changeStamp;
CompilerState(Compiler compiler) {
this.externsRoot = checkNotNull(compiler.externsRoot);
this.jsRoot = checkNotNull(compiler.jsRoot);
this.externAndJsRoot = checkNotNull(compiler.externAndJsRoot);
this.featureSet = checkNotNull(compiler.featureSet);
this.typeRegistry = compiler.typeRegistry;
this.externs = compiler.externs;
this.scriptNodeByFilename = checkNotNull(compiler.scriptNodeByFilename);
this.inputsById = checkNotNull(compiler.inputsById);
this.typeCheckingHasRun = compiler.typeCheckingHasRun;
this.synthesizedExternsInput = compiler.synthesizedExternsInput;
this.synthesizedExternsInputAtEnd = compiler.synthesizedExternsInputAtEnd;
this.injectedLibraries = compiler.injectedLibraries;
this.lastInjectedLibrary = compiler.lastInjectedLibrary;
this.hasRegExpGlobalReferences = compiler.hasRegExpGlobalReferences;
this.typeValidator = compiler.typeValidator;
this.lifeCycleStage = compiler.getLifeCycleStage();
this.externProperties = compiler.externProperties;
this.errors = compiler.errorManager.getErrors();
this.warnings = compiler.errorManager.getWarnings();
this.moduleGraph = compiler.moduleGraph;
this.uniqueNameId = compiler.uniqueNameId;
this.uniqueIdSupplier = compiler.uniqueIdSupplier;
this.exportedNames = compiler.exportedNames;
this.cssNames = compiler.cssNames;
this.variableMap = compiler.variableMap;
this.propertyMap = compiler.propertyMap;
this.anonymousFunctionaMap = compiler.anonymousFunctionNameMap;
this.stringMap = compiler.stringMap;
this.idGeneratorMap = compiler.idGeneratorMap;
this.crossModuleIdGenerator = compiler.crossModuleIdGenerator;
this.defaultDefineValues = checkNotNull(compiler.defaultDefineValues);
this.annotationMap = checkNotNull(compiler.annotationMap);
this.inputSourceMaps = compiler.inputSourceMaps;
this.changeStamp = compiler.changeStamp;
}
}
@GwtIncompatible("ObjectOutputStream")
public void saveState(OutputStream outputStream) throws IOException {
// Do not close the outputstream, caller is responsible for closing it.
final ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
runInCompilerThread(
() -> {
Tracer tracer = newTracer("serializeCompilerState");
objectOutputStream.writeObject(new CompilerState(Compiler.this));
if (typeRegistry != null) {
typeRegistry.saveContents(objectOutputStream);
}
stopTracer(tracer, "serializeCompilerState");
return null;
});
}
@GwtIncompatible("ObjectInputStream")
public void restoreState(InputStream inputStream) throws IOException, ClassNotFoundException {
initWarningsGuard(options.getWarningsGuard());
maybeSetTracker();
// Make a copy of the current module list so we can later reapply their names to the
// deserialized modules.
List newModules = null;
if (getModules() != null) {
newModules = ImmutableList.copyOf(getModules());
}
class CompilerObjectInputStream extends ObjectInputStream implements HasCompiler {
public CompilerObjectInputStream(InputStream in) throws IOException {
super(in);
}
@Override
public AbstractCompiler getCompiler() {
return Compiler.this;
}
}
// Do not close the input stream, caller is responsible for closing it.
final ObjectInputStream objectInputStream = new CompilerObjectInputStream(inputStream);
CompilerState compilerState =
runInCompilerThread(
new Callable() {
@Override
public CompilerState call() throws Exception {
Tracer tracer = newTracer(PassNames.DESERIALIZE_COMPILER_STATE);
logger.fine("Deserializing the CompilerState");
CompilerState compilerState = (CompilerState) objectInputStream.readObject();
logger.fine("Finished deserializing CompilerState");
if (compilerState.typeRegistry != null) {
logger.fine("Deserializing the TypeRegistry");
compilerState.typeRegistry.restoreContents(objectInputStream);
logger.fine("Finished deserializing TypeRegistry");
}
stopTracer(tracer, PassNames.DESERIALIZE_COMPILER_STATE);
return compilerState;
}
});
featureSet = compilerState.featureSet;
externs = compilerState.externs;
scriptNodeByFilename.clear();
scriptNodeByFilename.putAll(compilerState.scriptNodeByFilename);
inputsById.clear();
inputsById.putAll(compilerState.inputsById);
typeRegistry = compilerState.typeRegistry;
externAndJsRoot = compilerState.externAndJsRoot;
externsRoot = compilerState.externsRoot;
jsRoot = compilerState.jsRoot;
typeCheckingHasRun = compilerState.typeCheckingHasRun;
synthesizedExternsInput = compilerState.synthesizedExternsInput;
synthesizedExternsInputAtEnd = compilerState.synthesizedExternsInputAtEnd;
injectedLibraries.clear();
injectedLibraries.putAll(compilerState.injectedLibraries);
lastInjectedLibrary = compilerState.lastInjectedLibrary;
hasRegExpGlobalReferences = compilerState.hasRegExpGlobalReferences;
typeValidator = compilerState.typeValidator;
setLifeCycleStage(compilerState.lifeCycleStage);
externProperties = compilerState.externProperties;
moduleGraph = compilerState.moduleGraph;
uniqueNameId = compilerState.uniqueNameId;
uniqueIdSupplier = compilerState.uniqueIdSupplier;
exportedNames.clear();
exportedNames.addAll(compilerState.exportedNames);
cssNames = compilerState.cssNames;
variableMap = compilerState.variableMap;
propertyMap = compilerState.propertyMap;
stringMap = compilerState.stringMap;
anonymousFunctionNameMap = compilerState.anonymousFunctionaMap;
idGeneratorMap = compilerState.idGeneratorMap;
crossModuleIdGenerator = compilerState.crossModuleIdGenerator;
defaultDefineValues = checkNotNull(compilerState.defaultDefineValues);
annotationMap = checkNotNull(compilerState.annotationMap);
inputSourceMaps = compilerState.inputSourceMaps;
changeStamp = compilerState.changeStamp;
// Reapply module names to deserialized modules
renameModules(newModules, ImmutableList.copyOf(getModules()));
// restore errors.
if (compilerState.errors != null) {
for (JSError error : compilerState.errors) {
report(CheckLevel.ERROR, error);
}
}
if (compilerState.warnings != null) {
for (JSError warning : compilerState.warnings) {
report(CheckLevel.WARNING, warning);
}
}
if (tracker != null) {
tracker.updateAfterDeserialize(jsRoot);
}
}
/** Returns the module type for the provided namespace. */
@Override
@Nullable
CompilerInput.ModuleType getModuleTypeByName(String moduleName) {
return moduleTypesByName.get(moduleName);
}
private ModuleMetadataMap moduleMetadataMap;
@Override
public ModuleMetadataMap getModuleMetadataMap() {
return moduleMetadataMap;
}
@Override
public void setModuleMetadataMap(ModuleMetadataMap moduleMetadataMap) {
this.moduleMetadataMap = moduleMetadataMap;
}
private ModuleMap moduleMap;
@Override
public ModuleMap getModuleMap() {
return moduleMap;
}
@Override
public void setModuleMap(ModuleMap moduleMap) {
this.moduleMap = moduleMap;
}
/**
* Simplistic implementation of the java.nio.file.Path resolveSibling method that works with GWT.
*
* @param fromPath - must be a file (not directory)
* @param toPath - must be a file (not directory)
*/
private static String resolveSibling(String fromPath, String toPath) {
// If the destination is an absolute path, nothing to do.
if (toPath.startsWith("/")) {
return toPath;
}
List fromPathParts = new ArrayList<>(Arrays.asList(fromPath.split("/")));
List toPathParts = new ArrayList<>(Arrays.asList(toPath.split("/")));
if (!fromPathParts.isEmpty()) {
fromPathParts.remove(fromPathParts.size() - 1);
}
while (!fromPathParts.isEmpty() && !toPathParts.isEmpty()) {
if (toPathParts.get(0).equals(".")) {
toPathParts.remove(0);
} else if (toPathParts.get(0).equals("..")) {
toPathParts.remove(0);
fromPathParts.remove(fromPathParts.size() - 1);
} else {
break;
}
}
fromPathParts.addAll(toPathParts);
return String.join("/", fromPathParts);
}
public void resetAndIntitializeSourceMap() {
if (sourceMap == null) {
return;
}
sourceMap.reset();
if (options.sourceMapIncludeSourcesContent) {
if (options.applyInputSourceMaps) {
// Add any input source map content files to the source map as potential sources
for (SourceMapInput inputSourceMap : inputSourceMaps.values()) {
addSourceMapSourceFiles(inputSourceMap);
}
}
// Add all the compilation sources to the source map as potential sources
Iterable allModules = getModules();
if (allModules != null) {
List sourceFiles = new ArrayList<>();
for (JSModule module : allModules) {
for (CompilerInput input : module.getInputs()) {
sourceFiles.add(input.getSourceFile());
}
}
addFilesToSourceMap(sourceFiles);
}
}
}
private static Node checkNotModule(Node script, String msg, Object... args) {
checkArgument(script.isScript(), script);
if (!script.hasOneChild()) {
return script;
}
checkState(!script.getFirstChild().isModuleBody(), msg, args);
return script;
}
}