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/*
* Copyright 2009 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.checkState;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.errorprone.annotations.MustBeClosed;
import com.google.errorprone.annotations.OverridingMethodsMustInvokeSuper;
import com.google.javascript.jscomp.ExpressionDecomposer.Workaround;
import com.google.javascript.jscomp.colors.ColorRegistry;
import com.google.javascript.jscomp.deps.ModuleLoader;
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.parser.FeatureSet;
import com.google.javascript.jscomp.parsing.parser.trees.Comment;
import com.google.javascript.jscomp.serialization.ColorPool;
import com.google.javascript.jscomp.type.ReverseAbstractInterpreter;
import com.google.javascript.rhino.ErrorReporter;
import com.google.javascript.rhino.InputId;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.StaticScope;
import com.google.javascript.rhino.Token;
import com.google.javascript.rhino.jstype.JSTypeRegistry;
import java.io.Serializable;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Set;
import org.jspecify.nullness.Nullable;
/**
* An abstract compiler, to help remove the circular dependency of passes on JSCompiler.
*
* This is an abstract class, so that we can make the methods package-private.
*/
public abstract class AbstractCompiler implements SourceExcerptProvider, CompilerInputProvider {
static final DiagnosticType READ_ERROR =
DiagnosticType.error("JSC_READ_ERROR", "Cannot read file {0}: {1}");
private int currentPassIndex = -1;
/** Will be called before each pass runs. */
@OverridingMethodsMustInvokeSuper
void beforePass(String passName) {
this.currentPassIndex++;
}
/** Will be called after each pass finishes. */
@OverridingMethodsMustInvokeSuper
void afterPass(String passName) {}
private LifeCycleStage stage = LifeCycleStage.RAW;
// TODO(nicksantos): Decide if all of these are really necessary.
// Many of them are just accessors that should be passed to the
// CompilerPass's constructor.
abstract java.util.function.Supplier getTypedAstDeserializer(SourceFile file);
/** Looks up an input (possibly an externs input) by input id. May return null. */
@Override
public abstract CompilerInput getInput(InputId inputId);
/** Looks up a source file by name. May return null. */
abstract @Nullable SourceFile getSourceFileByName(String sourceName);
public abstract @Nullable Node getScriptNode(String filename);
/** Gets the module graph. */
abstract @Nullable JSChunkGraph getModuleGraph();
/**
* Gets the inputs in the order in which they are being processed. Only for use by {@code
* AbstractCompilerRunner}.
*/
abstract Iterable getInputsInOrder();
/**
* Gets the total number of inputs.
*
* This can be useful as a guide for the initial allocated size for data structures.
*/
abstract int getNumberOfInputs();
//
// Intermediate state and results produced and needed by particular passes.
// TODO(rluble): move these into the general structure for keeping state between pass runs.
//
/** Adds exported names to keep track. */
public abstract void addExportedNames(Set exportedVariableNames);
/** Gets the names that have been exported. */
public abstract Set getExportedNames();
/** Sets the variable renaming map */
public abstract void setVariableMap(VariableMap variableMap);
/** Sets the property renaming map */
public abstract void setPropertyMap(VariableMap propertyMap);
/** Sets the string replacement map */
public abstract void setStringMap(VariableMap stringMap);
/** Sets the css names found during compilation. */
public abstract void setCssNames(LinkedHashMap newCssNames);
/** Sets the mapping for instrumentation parameter encoding. */
public abstract void setInstrumentationMapping(VariableMap instrumentationMapping);
/** Sets the id generator for cross-module motion. */
public abstract void setIdGeneratorMap(String serializedIdMappings);
/** Gets the id generator for cross-module motion. */
public abstract IdGenerator getCrossModuleIdGenerator();
/** Sets the naming map for anonymous functions */
public abstract void setAnonymousFunctionNameMap(VariableMap functionMap);
//
// End of intermediate state needed by passes.
//
/** Sets whether the typechecking passes have run. */
abstract void setTypeCheckingHasRun(boolean hasRun);
/** Returns whether the typechecking passes have run */
public abstract boolean hasTypeCheckingRun();
/** Whether the AST has been annotated with optimization colors. */
public abstract boolean hasOptimizationColors();
/**
* Returns `true` when type checking has run, but the type registry has been cleared.
*
* See also `clearJSTypeRegistry()`.
*/
public abstract boolean isTypeRegistryCleared();
/** Gets a central registry of type information from the compiled JS. */
public abstract JSTypeRegistry getTypeRegistry();
public abstract void clearJSTypeRegistry();
/** Gets a central registry of colors from deserialized JS types. */
public abstract ColorRegistry getColorRegistry();
/** Sets the color registry */
public abstract void setColorRegistry(ColorRegistry registry);
abstract void forwardDeclareType(String typeName);
/** Gets a memoized scope creator with type information. */
abstract ScopeCreator getTypedScopeCreator();
abstract void clearTypedScopeCreator();
/** Gets the top scope. */
public abstract TypedScope getTopScope();
/** Sets the top scope. */
abstract void setTopScope(TypedScope x);
/**
* Returns a scope containing only externs and synthetic code or other code in the first script.
*
*
Intended for transpilation passes to look up types when synthesizing new code.
*/
abstract StaticScope getTranspilationNamespace();
/** Report an error or warning. */
public abstract void report(JSError error);
/** Report an internal error. */
abstract void throwInternalError(String msg, Throwable cause);
/** Gets the current coding convention. */
public abstract CodingConvention getCodingConvention();
/**
* Passes that make modifications in a scope that is different than the Compiler.currentScope use
* this (eg, InlineVariables and many others)
*/
public abstract void reportChangeToEnclosingScope(Node n);
/**
* Mark modifications in a scope that is different than the Compiler.currentScope use this (eg,
* InlineVariables and many others)
*/
public abstract void reportChangeToChangeScope(Node changeScopeRoot);
/**
* Mark a specific function node as known to be deleted. Is part of having accurate change
* tracking which is necessary to streamline optimizations.
*/
abstract void reportFunctionDeleted(Node node);
/** Sets the CssRenamingMap. */
abstract void setCssRenamingMap(CssRenamingMap map);
/** Gets the CssRenamingMap. */
abstract CssRenamingMap getCssRenamingMap();
/**
* Gets a suitable SCRIPT node to serve as a parent for code insertion. If {@code module} contains
* any inputs, the returned node will be the SCRIPT node corresponding to its first input. If
* {@code module} is empty, on the other hand, then the returned node will be the first SCRIPT
* node in a non-empty module that {@code module} depends on (the deepest one possible).
*
* @param module A module. If null, will return the first SCRIPT node of all modules.
* @return A SCRIPT node (never null).
*/
abstract Node getNodeForCodeInsertion(@Nullable JSChunk module);
abstract TypeValidator getTypeValidator();
/** Gets the central registry of type violations. */
public abstract Iterable getTypeMismatches();
abstract void setExternExports(String externExports);
/** Parses code for injecting, and associate it with a given source file. */
public abstract Node parseSyntheticCode(String filename, String code);
/** Parses code for testing. */
@VisibleForTesting
abstract Node parseTestCode(String code);
/** Parses code for testing. */
@VisibleForTesting
abstract Node parseTestCode(ImmutableList code);
/** Prints a node to source code. */
public abstract String toSource();
/** Prints a node to source code. */
public abstract String toSource(Node root);
/** Gets a default error reporter for injecting into Rhino. */
abstract ErrorReporter getDefaultErrorReporter();
/** Get an interpreter for type analysis. */
public abstract ReverseAbstractInterpreter getReverseAbstractInterpreter();
/** Returns the current life-cycle stage of the AST we're working on. */
public LifeCycleStage getLifeCycleStage() {
return stage;
}
private static final String FILL_FILE_SUFFIX = "$fillFile";
/** Empty modules get an empty "fill" file, so that we can move code into an empty module. */
static String createFillFileName(String moduleName) {
return moduleName + FILL_FILE_SUFFIX;
}
/** Returns whether a file name was created by {@link createFillFileName}. */
public static boolean isFillFileName(String fileName) {
return fileName.endsWith(FILL_FILE_SUFFIX);
}
/**
* Deserialize runtime libraries from a TypedAST packaged as a JAR resource and reconcile their
* Colors with the current inputs.
*
* This method must be called anywhere that Colors are reconciled for application to the AST.
* Otherwise Color information won't be consistent. `colorPoolBuilder` must be the same builder as
* used for the other inputs, and the caller retains ownership.
*
* @param colorPoolBuilder if present, includes inferred optimization colors on the deserialized
* ASTs. If absent, does not include colors.
*/
public void initRuntimeLibraryTypedAsts(Optional colorPoolBuilder) {
throw new UnsupportedOperationException(
"Implementation in Compiler.java is not J2CL compatible.");
}
/**
* Generates unique String Ids when requested via a compiler instance.
*
* This supplier provides Ids that are deterministic and unique across all input files given to
* the compiler. The generated ID format is: uniqueId = "fileHashCode$counterForThisFile"
*/
abstract UniqueIdSupplier getUniqueIdSupplier();
/**
* Generates unique ids.
*
* @deprecated because the generated names during transpilation are not unique across all input
* files. Use the new supplier by calling {@code getUniqueIdSupplier()}.
*/
@Deprecated
abstract Supplier getUniqueNameIdSupplier();
/**
* @return Whether any errors have been encountered that should stop the compilation process.
*/
abstract boolean hasHaltingErrors();
/** Register a listener for code change events. */
abstract void addChangeHandler(CodeChangeHandler handler);
/** Remove a listener for code change events. */
abstract void removeChangeHandler(CodeChangeHandler handler);
/** Register a provider for some type of index. */
abstract void addIndexProvider(IndexProvider indexProvider);
/**
* Returns, from a provider, the desired index of type T, otherwise null if no provider is
* registered for the given type.
*/
abstract T getIndex(Class type);
/** A monotonically increasing value to identify a change */
abstract int getChangeStamp();
/**
* An accumulation of changed scope nodes since the last time the given pass was run. A returned
* empty list means no scope nodes have changed since the last run and a returned null means this
* is the first time the pass has run.
*/
abstract List getChangedScopeNodesForPass(String passName);
/**
* An accumulation of deleted scope nodes since the last time the given pass was run. A returned
* null or empty list means no scope nodes have been deleted since the last run or this is the
* first time the pass has run.
*/
abstract List getDeletedScopeNodesForPass(String passName);
/** Called to indicate that the current change stamp has been used */
abstract void incrementChangeStamp();
/** Returns the root of the source tree, ignoring externs */
abstract Node getJsRoot();
/** True iff a function changed since the last time a pass was run */
abstract boolean hasScopeChanged(Node n);
/**
* Represents the different contexts for which the compiler could have distinct configurations.
*/
static enum ConfigContext {
/** Normal JavaScript. */
DEFAULT,
/** Externs files. */
EXTERNS
}
/** Returns the parser configuration for the specified context. */
abstract Config getParserConfig(ConfigContext context);
/** Gets the error manager. */
public abstract ErrorManager getErrorManager();
/** Set the current life-cycle state. */
void setLifeCycleStage(LifeCycleStage stage) {
this.stage = stage;
}
/**
* Are the nodes equal for the purpose of inlining? If type aware optimizations are on, type
* equality is checked.
*/
abstract boolean areNodesEqualForInlining(Node n1, Node n2);
/**
* Set if RegExp global properties are used.
*
* @param references Whether there are references to the RegExp global object properties.
*/
abstract void setHasRegExpGlobalReferences(boolean references);
/**
* @return Whether the AST contains references to the RegExp global object properties.
*/
abstract boolean hasRegExpGlobalReferences();
/**
* @return The error level the given error object will be reported at.
*/
abstract CheckLevel getErrorLevel(JSError error);
/** What point in optimizations we're in. For use by compiler passes */
public static enum LifeCycleStage implements Serializable {
RAW,
// See constraints put on the AST by either running the ConvertTypesToColors.java pass /or/ by
// having created the AST via serialization/TypedAstDeserializer.java
// NORMALIZED implies this constraint
COLORS_AND_SIMPLIFIED_JSDOC,
// See constraints put on the tree by Normalize.java
NORMALIZED,
// The normalize pass has put constraints on the tree,
// but variables and properties have been renamed so
// coding conventions no longer apply.
NORMALIZED_OBFUSCATED;
public boolean isNormalized() {
return this == NORMALIZED || this == NORMALIZED_OBFUSCATED;
}
public boolean isNormalizedUnobfuscated() {
return this == NORMALIZED;
}
public boolean isNormalizedObfuscated() {
return this == NORMALIZED_OBFUSCATED;
}
public boolean hasColorAndSimplifiedJSDoc() {
return this != RAW;
}
}
/**
* Runs a given compiler-pass by calling its {@code process()} method.
*
* @param pass The pass to be run.
*/
abstract void process(CompilerPass pass);
/** Returns the root node of the AST, which includes both externs and source. */
public abstract Node getRoot();
abstract CompilerOptions getOptions();
/**
* The set of features defined by the input language mode that have not (yet) been transpiled
* away.
*
* This is **not** the exact set of all features currently in the AST, but rather an improper
* super set. This set starts out as the set of features from the language input mode specified by
* the options, which is verified to be a super set of what appears in the input code (if the
* input code contains a feature outside the language input mode it is an error). As the compiler
* transpiles code any features that are transpiled away from the AST are removed from this set.
*
*
The feature set is computed this way, rather than using the detected features in the AST, so
* that the set of passes that run is determined purely by input flags. Otherwise, introducing a
* previously unused feature in any of the transitive deps of compilation target could effect the
* build behaviour.
*/
abstract FeatureSet getFeatureSet();
abstract void setFeatureSet(FeatureSet fs);
/**
* @return a CompilerInput that can be modified to add additional extern definitions to the
* beginning of the externs AST
*/
abstract CompilerInput getSynthesizedExternsInput();
/** Gets the last pass name set by setProgress. */
abstract String getLastPassName();
static final String RUNTIME_LIB_DIR =
"src/com/google/javascript/jscomp/js/";
/**
* The subdir js/ contains libraries of code that we inject at compile-time only if requested by
* this function.
*
*
Notice that these libraries will almost always create global symbols.
*
* @param resourceName The name of the library. For example, if "base" is is specified, then we
* load js/base.js
* @param force Inject the library even if compiler options say not to.
* @return The last node of the most-recently-injected runtime library. If new code was injected,
* this will be the last expression node of the library. If the caller needs to add additional
* code, they should add it as the next sibling of this node. If no runtime libraries have
* been injected, then null is returned.
*/
abstract Node ensureLibraryInjected(String resourceName, boolean force);
/**
* Sets the names of the properties defined in externs.
*
* @param externProperties The set of property names defined in externs.
*/
abstract void setExternProperties(ImmutableSet externProperties);
/**
* Gets the names of the properties defined in externs or null if GatherExternProperties pass was
* not run yet.
*/
public abstract ImmutableSet getExternProperties();
/**
* Adds a {@link SourceMapInput} for the given {@code sourceFileName}, to be used for error
* reporting and source map combining.
*/
public abstract void addInputSourceMap(String name, SourceMapInput sourceMap);
public abstract SourceMapInput getInputSourceMap(String sourceFileName);
abstract void addComments(String filename, List comments);
/**
* Returns a summary an entry for every property name found in the AST with a getter and / or
* setter defined.
*
* Property names for which there are no getters or setters will not be in the map.
*/
abstract AccessorSummary getAccessorSummary();
/** Sets the summary of properties with getters and setters. */
public abstract void setAccessorSummary(AccessorSummary summary);
/** Returns all the comments from the given file. */
abstract List getComments(String filename);
/** Gets the module loader. */
abstract ModuleLoader getModuleLoader();
/** Lookup the type of a module from its name. */
abstract CompilerInput.ModuleType getModuleTypeByName(String moduleName);
/** Set whether J2CL passes should run */
abstract void setRunJ2clPasses(boolean runJ2clPasses);
/** Whether J2CL passes should run */
abstract boolean runJ2clPasses();
/**
* Returns a new AstFactory that will add type information to the nodes it creates if and only if
* type checking has already happened and types have not been converted into colors.
*
* Note that the AstFactory will /not/ add colors to the AST if types have been converted into
* colors. The AstFactory does not understand colors, although color support could certainly be
* added if it proves useful.
*/
public final AstFactory createAstFactory() {
return hasTypeCheckingRun()
? (hasOptimizationColors()
? AstFactory.createFactoryWithColors(getColorRegistry())
: AstFactory.createFactoryWithTypes(getTypeRegistry()))
: AstFactory.createFactoryWithoutTypes();
}
/**
* Returns a new AstFactory that will not add type information, regardless of whether type
* checking has already happened.
*/
public final AstFactory createAstFactoryWithoutTypes() {
return AstFactory.createFactoryWithoutTypes();
}
/**
* Returns a new AstAnalyzer configured correctly to answer questions about Nodes in the AST
* currently being compiled.
*/
public AstAnalyzer getAstAnalyzer() {
return new AstAnalyzer(this, getOptions().getAssumeGettersArePure());
}
public ExpressionDecomposer createDefaultExpressionDecomposer() {
return createExpressionDecomposer(
this.getUniqueNameIdSupplier(),
ImmutableSet.of(),
Scope.createGlobalScope(new Node(Token.SCRIPT)));
}
public ExpressionDecomposer createExpressionDecomposer(
Supplier uniqueNameIdSupplier,
ImmutableSet knownConstantFunctions,
Scope scope) {
// If the output is ES5, then it may end up running on IE11, so enable a workaround
// for one of its bugs.
final EnumSet enabledWorkarounds =
FeatureSet.ES5.contains(getOptions().getOutputFeatureSet())
? EnumSet.of(Workaround.BROKEN_IE11_LOCATION_ASSIGN)
: EnumSet.noneOf(Workaround.class);
return new ExpressionDecomposer(
this, uniqueNameIdSupplier, knownConstantFunctions, scope, enabledWorkarounds);
}
public abstract ModuleMetadataMap getModuleMetadataMap();
public abstract void setModuleMetadataMap(ModuleMetadataMap moduleMetadataMap);
public abstract ModuleMap getModuleMap();
public abstract void setModuleMap(ModuleMap moduleMap);
public final boolean isDebugLoggingEnabled() {
return this.getOptions().getDebugLogDirectory() != null;
}
public final List getDebugLogFilterList() {
if (this.getOptions().getDebugLogFilter() == null) {
return new ArrayList<>();
}
return Splitter.on(',').omitEmptyStrings().splitToList(this.getOptions().getDebugLogFilter());
}
/** Provides logging access to a file with the specified name. */
@MustBeClosed
public final LogFile createOrReopenLog(
Class owner, String firstNamePart, String... restNameParts) {
if (!this.isDebugLoggingEnabled()) {
return LogFile.createNoOp();
}
Path dir = getOptions().getDebugLogDirectory();
Path relativeParts = Paths.get(firstNamePart, restNameParts);
Path file = dir.resolve(owner.getSimpleName()).resolve(relativeParts);
// If a filter list for log file names was provided, only create a log file if any
// of the filter strings matches.
List filters = getDebugLogFilterList();
if (filters.isEmpty()) {
return LogFile.createOrReopen(file);
}
for (String filter : filters) {
if (file.toString().contains(filter)) {
return LogFile.createOrReopen(file);
}
}
return LogFile.createNoOp();
}
/**
* Provides logging access to a file with the specified name, differentiated by the index of the
* current pass.
*
* Indexing helps in separating logs from different pass loops. The filename pattern is
* "[debug_log_directory]/[owner_name]/([name_part[i]]/){0,n-1}[pass_index]_[name_part[n]]".
*/
@MustBeClosed
public final LogFile createOrReopenIndexedLog(
Class owner, String firstNamePart, String... restNameParts) {
checkState(this.currentPassIndex >= 0, this.currentPassIndex);
String index = Strings.padStart(Integer.toString(this.currentPassIndex), 3, '0');
int length = restNameParts.length;
if (length == 0) {
firstNamePart = index + "_" + firstNamePart;
} else {
restNameParts[length - 1] = index + "_" + restNameParts[length - 1];
}
return this.createOrReopenLog(owner, firstNamePart, restNameParts);
}
/** Returns the InputId of the synthetic code input (even if it is not initialized yet). */
abstract InputId getSyntheticCodeInputId();
/**
* Adds a synthetic script to the front of the AST
*
*
Useful to allow inserting code into the global scope, earlier than any of the user-provided
* code, in the case that the first user-provided input is a module.
*/
abstract void initializeSyntheticCodeInput();
/** Removes the script added by {@link #initializeSyntheticCodeInput} */
abstract void removeSyntheticCodeInput();
/**
* Merges all code in the script added by {@link #initializeSyntheticCodeInput} into the first
* non-synthetic script. Will crash if the first non-synthetic script is a module and module
* rewriting has not occurred.
*/
abstract void mergeSyntheticCodeInput();
}