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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2005 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.Predicates.alwaysTrue;

import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.CompilerOptions.Reach;
import com.google.javascript.jscomp.FunctionInjector.CanInlineResult;
import com.google.javascript.jscomp.FunctionInjector.InliningMode;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.jspecify.nullness.Nullable;

/**
 * Inlines functions that are divided into two types: "direct call node replacement" (aka "direct")
 * and as a block of statements (aka block). Function that can be inlined "directly" functions
 * consist of a single return statement, everything else is must be inlined as a "block". These
 * functions must meet these general requirements: - it is not recursive - the function does not
 * contain another function -- these may be intentional to to limit the scope of closures. -
 * function is called only once OR the size of the inline function is smaller than the call itself.
 * - the function name is not referenced in any other manner
 *
 * 

"directly" inlined functions must meet these additional requirements: - consists of a single * return statement */ class InlineFunctions implements CompilerPass { // TODO(nicksantos): This needs to be completely rewritten to use scopes // to do variable lookups. Right now, it assumes that all functions are // uniquely named variables. There's currently a stopgap scope-check // to ensure that this doesn't produce invalid code. But in the long run, // this needs a major refactor. private final Map fns = new LinkedHashMap<>(); private final Map anonFns = new HashMap<>(); private final AbstractCompiler compiler; private final FunctionInjector injector; private final FunctionArgumentInjector functionArgumentInjector; private final Reach reach; private final boolean assumeMinimumCapture; private final boolean enforceMaxSizeAfterInlining; private final int maxSizeAfterInlining; InlineFunctions( AbstractCompiler compiler, Supplier safeNameIdSupplier, Reach reach, boolean assumeStrictThis, boolean assumeMinimumCapture, int maxSizeAfterInlining) { checkArgument(compiler != null); checkArgument(safeNameIdSupplier != null); checkArgument(reach != Reach.NONE); this.compiler = compiler; this.reach = reach; this.assumeMinimumCapture = assumeMinimumCapture; this.maxSizeAfterInlining = maxSizeAfterInlining; this.enforceMaxSizeAfterInlining = maxSizeAfterInlining != CompilerOptions.UNLIMITED_FUN_SIZE_AFTER_INLINING; // TODO(b/124253050): Update bookkeeping logic and reenable method call inliing. // Method call decomposition creates new call nodes after all the analysis // is done, which would cause such calls to function to be left behind after // the function itself is removed. The function inliner need to be made // aware of these new calls in order to enable it. this.functionArgumentInjector = new FunctionArgumentInjector(compiler.getAstAnalyzer()); this.injector = new FunctionInjector.Builder(compiler) .safeNameIdSupplier(safeNameIdSupplier) .assumeStrictThis(assumeStrictThis) .assumeMinimumCapture(assumeMinimumCapture) .functionArgumentInjector(this.functionArgumentInjector) .build(); } FunctionState getOrCreateFunctionState(String fnName) { return fns.computeIfAbsent(fnName, (String k) -> new FunctionState()); } @Override public void process(Node externs, Node root) { checkState(compiler.getLifeCycleStage().isNormalized()); NodeTraversal.traverse(compiler, root, new FindCandidateFunctions()); if (fns.isEmpty()) { return; // Nothing left to do. } NodeTraversal.traverse(compiler, root, new FindCandidatesReferences(fns, anonFns)); trimCandidatesNotMeetingMinimumRequirements(); if (fns.isEmpty()) { return; // Nothing left to do. } // Store the set of function names eligible for inlining and use this to // prevent function names from being moved into temporaries during // expression decomposition. If this movement were allowed it would prevent // the Inline callback from finding the function calls. // // This pass already assumes these are constants, so this is safe for anyone // using function inlining. // ImmutableSet fnNames = ImmutableSet.copyOf(fns.keySet()); injector.setKnownConstantFunctions(fnNames); trimCandidatesUsingOnCost(); if (fns.isEmpty()) { return; // Nothing left to do. } resolveInlineConflicts(); decomposeExpressions(); NodeTraversal.traverse(compiler, root, new CallVisitor(fns, anonFns, new Inline(injector))); removeInlinedFunctions(); } private static boolean isAlwaysInlinable(Node fn) { checkArgument(fn.isFunction()); Node body = NodeUtil.getFunctionBody(fn); return (!body.hasChildren()) || (body.hasOneChild() && body.getFirstChild().isReturn()); } private boolean targetSizeAfterInlineExceedsLimit(NodeTraversal t, FunctionState functionState) { Node containingFunction = t.getEnclosingFunction(); // Always inline at the top level, // unless maybeAddFunction has marked functionState as not inlinable. if (containingFunction == null) { return false; } Node inlinedFun = functionState.getFn().getFunctionNode(); if (isAlwaysInlinable(inlinedFun)) { return false; } int inlinedFunSize = NodeUtil.countAstSizeUpToLimit(NodeUtil.getFunctionBody(inlinedFun), maxSizeAfterInlining); int targetFunSize = NodeUtil.countAstSizeUpToLimit(containingFunction, maxSizeAfterInlining); return inlinedFunSize + targetFunSize > maxSizeAfterInlining; } /** Find functions that might be inlined. */ private class FindCandidateFunctions extends AbstractPostOrderCallback { private int callsSeen = 0; @Override public void visit(NodeTraversal t, Node n, Node parent) { if (reach.includesGlobals() || !t.inGlobalHoistScope()) { findNamedFunctions(t, n, parent); findFunctionExpressions(t, n); } } public void findNamedFunctions(NodeTraversal t, Node n, Node parent) { if (!NodeUtil.isStatement(n)) { // There aren't any interesting functions here. return; } switch (n.getToken()) { // Functions expressions in the form of: // var fooFn = function(x) { return ... } case VAR: case LET: case CONST: Preconditions.checkState(n.hasOneChild(), n); Node nameNode = n.getFirstChild(); if (nameNode.isName() && nameNode.hasChildren() && nameNode.getFirstChild().isFunction()) { maybeAddFunction(new FunctionVar(n), t.getChunk()); } break; // Named functions // function Foo(x) { return ... } case FUNCTION: Preconditions.checkState(NodeUtil.isStatementBlock(parent) || parent.isLabel()); if (NodeUtil.isFunctionDeclaration(n)) { Function fn = new NamedFunction(n); maybeAddFunction(fn, t.getChunk()); } break; default: break; } } /** * Find function expressions that are called directly in the form of * (function(a,b,...){...})(a,b,...) or (function(a,b,...){...}).call(this,a,b, ...) */ public void findFunctionExpressions(NodeTraversal t, Node n) { switch (n.getToken()) { // Functions expressions in the form of: // (function(){})(); case OPTCHAIN_CALL: case CALL: Node fnNode = null; if (n.getFirstChild().isFunction()) { fnNode = n.getFirstChild(); } else if (NodeUtil.isFunctionObjectCall(n)) { Node fnIdentifyingNode = n.getFirstFirstChild(); if (fnIdentifyingNode.isFunction()) { fnNode = fnIdentifyingNode; } } // If an interesting function was discovered, add it. if (fnNode != null) { Function fn = new FunctionExpression(fnNode, callsSeen++); maybeAddFunction(fn, t.getChunk()); anonFns.put(fnNode, fn.getName()); } break; default: break; } } } /** * Updates the FunctionState object for the given function. Checks if the given function matches * the criteria for an inlinable function. */ void maybeAddFunction(Function fn, JSChunk module) { String name = fn.getName(); FunctionState functionState = getOrCreateFunctionState(name); // TODO(johnlenz): Maybe "smarten" FunctionState by adding this logic to it? // If the function has multiple definitions, don't inline it. if (functionState.hasExistingFunctionDefinition()) { functionState.disallowInlining(); return; } Node fnNode = fn.getFunctionNode(); if (hasNoInlineAnnotation(fnNode)) { functionState.disallowInlining(); return; } if (enforceMaxSizeAfterInlining && !isAlwaysInlinable(fnNode) && maxSizeAfterInlining <= NodeUtil.countAstSizeUpToLimit(fnNode, maxSizeAfterInlining)) { functionState.disallowInlining(); return; } // verify the function hasn't already been marked as "don't inline" if (functionState.canInline()) { // store it for use when inlining. functionState.setFn(fn); if (FunctionInjector.isDirectCallNodeReplacementPossible(fn.getFunctionNode())) { functionState.inlineDirectly(true); } if (hasNonInlinableParam(NodeUtil.getFunctionParameters(fnNode))) { functionState.disallowInlining(); } // verify the function meets all the requirements. // TODO(johnlenz): Minimum requirement checks are about 5% of the // run-time cost of this pass. if (!isCandidateFunction(fn)) { // It doesn't meet the requirements. functionState.disallowInlining(); } // Set the module and gather names that need temporaries. if (functionState.canInline()) { functionState.setModule(module); Set namesToAlias = functionArgumentInjector.findModifiedParameters(fnNode); if (!namesToAlias.isEmpty()) { functionState.inlineDirectly(false); functionState.setNamesToAlias(namesToAlias); } Node block = NodeUtil.getFunctionBody(fnNode); if (NodeUtil.referencesEnclosingReceiver(block)) { functionState.setReferencesThis(true); } if (NodeUtil.has(block, Node::isFunction, alwaysTrue())) { functionState.setHasInnerFunctions(true); // If there are inner functions, we can inline into global scope // if there are no local vars or named functions. // TODO(johnlenz): this can be improved by looking at the possible // values for locals. If there are simple values, or constants // we could still inline. if (!assumeMinimumCapture && hasLocalNames(fnNode)) { functionState.disallowInlining(); } } } if (fnNode.getGrandparent().isVar()) { Node block = functionState.getFn().getDeclaringBlock(); if (block.isBlock() && !block.getParent().isFunction() && NodeUtil.has(block, (n) -> n.isLet() || n.isConst(), alwaysTrue())) { // The function might capture a variable that's not in scope at the call site, // so don't inline. functionState.disallowInlining(); } } if (fnNode.isGeneratorFunction()) { functionState.disallowInlining(); } if (fnNode.isAsyncFunction()) { functionState.disallowInlining(); } } } private boolean hasNoInlineAnnotation(Node fnNode) { JSDocInfo jsDocInfo = NodeUtil.getBestJSDocInfo(fnNode); return jsDocInfo != null && jsDocInfo.isNoInline(); } /** * @param fnNode The function to inspect. * @return Whether the function has parameters, var/const/let, class, or function declarations. */ private static boolean hasLocalNames(Node fnNode) { Node block = NodeUtil.getFunctionBody(fnNode); return NodeUtil.getFunctionParameters(fnNode).hasChildren() || NodeUtil.has( block, new NodeUtil.MatchDeclaration(), new NodeUtil.MatchShallowStatement()); } /** Checks if the given function matches the criteria for an inlinable function. */ private boolean isCandidateFunction(Function fn) { // Don't inline exported functions. String fnName = fn.getName(); if (compiler.getCodingConvention().isExported(fnName)) { // TODO(johnlenz): Should we allow internal references to be inlined? // An exported name can be replaced externally, any inlined instance // would not reflect this change. // To allow inlining we need to be able to distinguish between exports // that are used in a read-only fashion and those that can be replaced // by external definitions. return false; } // Don't inline this special function if (compiler.getCodingConvention().isPropertyRenameFunction(fn.getNameNode())) { return false; } Node fnNode = fn.getFunctionNode(); return injector.doesFunctionMeetMinimumRequirements(fnName, fnNode); } /** @see CallVisitor */ private interface CallVisitorCallback { public void visitCallSite(NodeTraversal t, Node callNode, FunctionState functionState); } /** Visit call sites for functions in functionMap. */ private static class CallVisitor extends AbstractPostOrderCallback { protected CallVisitorCallback callback; private final Map functionMap; private final Map anonFunctionMap; CallVisitor( Map fns, Map anonFns, @Nullable CallVisitorCallback callback) { this.functionMap = fns; this.anonFunctionMap = anonFns; this.callback = callback; } @Override public void visit(NodeTraversal t, Node n, Node parent) { switch (n.getToken()) { // Function calls case OPTCHAIN_CALL: case CALL: Node child = n.getFirstChild(); String name = null; // NOTE: The normalization pass ensures that local names do not collide with global names. if (child.isName()) { name = child.getString(); } else if (child.isFunction()) { name = anonFunctionMap.get(child); } else if (NodeUtil.isFunctionObjectCall(n)) { checkState(NodeUtil.isNormalOrOptChainGet(child)); Node fnIdentifyingNode = child.getFirstChild(); if (fnIdentifyingNode.isName()) { name = fnIdentifyingNode.getString(); } else if (fnIdentifyingNode.isFunction()) { name = anonFunctionMap.get(fnIdentifyingNode); } } if (name != null) { FunctionState functionState = functionMap.get(name); // Only visit call-sites for functions that can be inlined. if (functionState != null) { callback.visitCallSite(t, n, functionState); } } break; default: break; } } } /** @return Whether the name is used in a way that might be a candidate for inlining. */ static boolean isCandidateUsage(Node name) { Node parent = name.getParent(); checkState(name.isName()); if (NodeUtil.isNameDeclaration(parent) || parent.isFunction()) { // This is a declaration. Duplicate declarations are handle during // function candidate gathering. return true; } if (NodeUtil.isNormalOrOptChainCall(parent) && parent.getFirstChild() == name) { // This is a normal reference to the function. return true; } // Check for a ".call" to the named function: // CALL // GETPROP/GETELEM // NAME // STRING == "call" // This-Value // Function-parameter-1 // ... if ((parent.isGetElem() && name == parent.getFirstChild() && parent.getSecondChild().isStringLit() && parent.getSecondChild().getString().equals("call")) || (parent.isGetProp() && parent.getString().equals("call"))) { Node grandparent = name.getAncestor(2); if (grandparent.isCall() && grandparent.getFirstChild() == parent) { // Yep, a ".call". return true; } } return false; } /** Find references to functions that are inlinable. */ private class FindCandidatesReferences extends CallVisitor implements CallVisitorCallback { FindCandidatesReferences(Map fns, Map anonFns) { super(fns, anonFns, null); this.callback = this; } @Override public void visit(NodeTraversal t, Node n, Node parent) { super.visit(t, n, parent); if (n.isName()) { checkNameUsage(n, parent); } } @Override public void visitCallSite(NodeTraversal t, Node callNode, FunctionState functionState) { maybeAddReference(t, functionState, callNode, t.getChunk()); } void maybeAddReference( NodeTraversal t, FunctionState functionState, Node callNode, JSChunk module) { if (!functionState.canInline()) { return; } InliningMode mode = functionState.canInlineDirectly() ? InliningMode.DIRECT : InliningMode.BLOCK; boolean referenceAdded = maybeAddReferenceUsingMode(t, functionState, callNode, module, mode); if (!referenceAdded && mode == InliningMode.DIRECT) { // This reference can not be directly inlined, see if // block replacement inlining is possible. mode = InliningMode.BLOCK; referenceAdded = maybeAddReferenceUsingMode(t, functionState, callNode, module, mode); } if (!referenceAdded) { // Don't try to remove a function if we can't inline all // the references. functionState.setRemove(false); } } private boolean maybeAddReferenceUsingMode( NodeTraversal t, FunctionState functionState, Node callNode, JSChunk module, InliningMode mode) { // If many functions are inlined into the same function F in the same // inlining round, then the size of F may exceed the max size. // This could be avoided if we bail later, during the inlining phase, eg, // in Inline#visitCallSite. However, that is not safe, because at that // point expression decomposition has already run, and we want to // decompose expressions only for the calls that are actually inlined. if (enforceMaxSizeAfterInlining && targetSizeAfterInlineExceedsLimit(t, functionState)) { return false; } Reference candidate = new Reference(callNode, t.getScope(), module, mode); CanInlineResult result = injector.canInlineReferenceToFunction( candidate, functionState.getFn().getFunctionNode(), functionState.getNamesToAlias(), functionState.getReferencesThis(), functionState.hasInnerFunctions()); if (result != CanInlineResult.NO) { // Yeah! candidate.setRequiresDecomposition(result == CanInlineResult.AFTER_PREPARATION); functionState.addReference(candidate); return true; } return false; } /** Find functions that can be inlined. */ private void checkNameUsage(Node n, Node parent) { checkState(n.isName(), n); if (isCandidateUsage(n)) { return; } // Other refs to a function name remove its candidacy for inlining String name = n.getString(); FunctionState functionState = fns.get(name); if (functionState == null) { return; } // If the name is being assigned to it can not be inlined. if (parent.isAssign() && parent.getFirstChild() == n) { // e.g. bar = something; <== we can't inline "bar" // so mark the function as uninlinable. // TODO(johnlenz): Should we just remove it from fns here? functionState.disallowInlining(); } else { // e.g. var fn = bar; <== we can't inline "bar" // As this reference can't be inlined mark the function as // unremovable. functionState.setRemove(false); } } } /** Inline functions at the call sites. */ private static class Inline implements CallVisitorCallback { private final FunctionInjector injector; Inline(FunctionInjector injector) { this.injector = injector; } @Override public void visitCallSite(NodeTraversal t, Node callNode, FunctionState functionState) { checkState(functionState.hasExistingFunctionDefinition()); if (functionState.canInline()) { Reference ref = functionState.getReference(callNode); // There are two cases ref can be null: if the call site was introduced // because it was part of a function that was inlined during this pass // or if the call site was trimmed from the list of references because // the function couldn't be inlined at this location. if (ref != null) { inlineFunction(t, ref, functionState); // Keep track of references that have been inlined so that // we can verify that none have been missed. ref.inlined = true; } } } /** Inline a function into the call site. */ private void inlineFunction(NodeTraversal t, Reference ref, FunctionState functionState) { Function fn = functionState.getFn(); String fnName = fn.getName(); Node fnNode = functionState.getSafeFnNode(); Node newExpr = injector.inline(ref, fnName, fnNode); if (!newExpr.equals(ref.callNode)) { t.getCompiler().reportChangeToEnclosingScope(newExpr); } } } /** Remove entries that aren't a valid inline candidates, from the list of encountered names. */ private void trimCandidatesNotMeetingMinimumRequirements() { Iterator> i; for (i = fns.entrySet().iterator(); i.hasNext(); ) { FunctionState functionState = i.next().getValue(); if (!functionState.hasExistingFunctionDefinition() || !functionState.canInline()) { i.remove(); } } } /** Remove entries from the list of candidates that can't be inlined. */ private void trimCandidatesUsingOnCost() { Iterator> i; for (i = fns.entrySet().iterator(); i.hasNext(); ) { FunctionState functionState = i.next().getValue(); if (functionState.hasReferences()) { // Only inline function if it decreases the code size. boolean lowersCost = minimizeCost(functionState); if (!lowersCost) { // It shouldn't be inlined; remove it from the list. i.remove(); } } else if (!functionState.canRemove()) { // Don't bother tracking functions without references that can't be // removed. i.remove(); } } } /** * Determines if the function is worth inlining and potentially trims references that increase the * cost. * * @return Whether inlining the references lowers the overall cost. */ private boolean minimizeCost(FunctionState functionState) { if (!inliningLowersCost(functionState)) { // Try again without Block inlining references if (functionState.hasBlockInliningReferences()) { functionState.setRemove(false); functionState.removeBlockInliningReferences(); if (!functionState.hasReferences() || !inliningLowersCost(functionState)) { return false; } } else { return false; } } return true; } /** @return Whether inlining the function reduces code size. */ private boolean inliningLowersCost(FunctionState functionState) { return injector.inliningLowersCost( functionState.getModule(), functionState.getFn().getFunctionNode(), functionState.getReferences(), functionState.getNamesToAlias(), functionState.canRemove(), functionState.getReferencesThis()); } /** * Size base inlining calculations are thrown off when a function that is being inlined also * contains calls to functions that are slated for inlining. * *

Specifically, a clone of the FUNCTION node tree is used when the function is inlined. Calls * in this new tree are not included in the list of function references so they won't be inlined * (which is what we want). Here we mark those functions as non-removable (as they will have new * references in the cloned node trees). * *

This prevents a function that would only be inlined because it is referenced once from being * inlined into multiple call sites because the calling function has been inlined in multiple * locations or the function being removed while there are still references. */ private void resolveInlineConflicts() { for (FunctionState functionState : fns.values()) { resolveInlineConflictsForFunction(functionState); } } /** * @return Whether the function has any parameters that would stop the compiler from inlining. * Currently this includes object patterns, array patterns, and default values. */ private static boolean hasNonInlinableParam(Node node) { checkNotNull(node); Predicate pred = (Node input) -> input.isDefaultValue() || input.isDestructuringPattern(); return NodeUtil.has(node, pred, alwaysTrue()); } /** @see #resolveInlineConflicts */ private void resolveInlineConflictsForFunction(FunctionState functionState) { // Functions that aren't referenced don't cause conflicts. if (!functionState.hasReferences() || !functionState.canInline()) { return; } Node fnNode = functionState.getFn().getFunctionNode(); Set names = findCalledFunctions(fnNode); if (!names.isEmpty()) { // Prevent the removal of the referenced functions. for (String name : names) { FunctionState fsCalled = fns.get(name); if (fsCalled != null && fsCalled.canRemove()) { fsCalled.setRemove(false); // For functions that can no longer be removed, check if they should // still be inlined. if (!minimizeCost(fsCalled)) { // It can't be inlined remove it from the list. fsCalled.disallowInlining(); } } } // Make a copy of the Node, so it isn't changed by other inlines. functionState.setSafeFnNode(functionState.getFn().getFunctionNode().cloneTree()); } } /** This functions that may be called directly. */ private Set findCalledFunctions(Node node) { Set changed = new HashSet<>(); findCalledFunctions(NodeUtil.getFunctionBody(node), changed); return changed; } /** @see #findCalledFunctions(Node) */ private static void findCalledFunctions(Node node, Set changed) { checkArgument(changed != null); // For each referenced function, add a new reference if (node.isName() && isCandidateUsage(node)) { changed.add(node.getString()); } for (Node c = node.getFirstChild(); c != null; c = c.getNext()) { findCalledFunctions(c, changed); } } /** * For any call-site that needs it, prepare the call-site for inlining by rewriting the containing * expression. */ private void decomposeExpressions() { for (FunctionState functionState : fns.values()) { if (functionState.canInline()) { for (Reference ref : functionState.getReferences()) { if (ref.requiresDecomposition) { injector.maybePrepareCall(ref); } } } } } /** Removed inlined functions that no longer have any references. */ void removeInlinedFunctions() { for (Map.Entry entry : fns.entrySet()) { String name = entry.getKey(); FunctionState functionState = entry.getValue(); if (functionState.canRemove()) { Function fn = functionState.getFn(); checkState(functionState.canInline()); checkState(fn != null); verifyAllReferencesInlined(name, functionState); fn.remove(); NodeUtil.markFunctionsDeleted(fn.getFunctionNode(), compiler); } } } /** Check to verify that expression rewriting didn't make a call inaccessible. */ void verifyAllReferencesInlined(String name, FunctionState functionState) { for (Reference ref : functionState.getReferences()) { if (!ref.inlined) { Node parent = ref.callNode.getParent(); throw new IllegalStateException( "Call site missed (" + name + ").\n call: " + ref.callNode.toStringTree() + "\n parent: " + ((parent == null) ? "null" : parent.toStringTree())); } } } /** Use to track the decisions that have been made about a function. */ private static class FunctionState { private @Nullable Function fn = null; private @Nullable Node safeFnNode = null; private boolean inline = true; private boolean remove = true; private boolean inlineDirectly = false; private boolean referencesThis = false; private boolean hasInnerFunctions = false; private @Nullable Map references = null; private @Nullable JSChunk module = null; private @Nullable Set namesToAlias = null; boolean hasExistingFunctionDefinition() { return (fn != null); } public void setReferencesThis(boolean referencesThis) { this.referencesThis = referencesThis; } public boolean getReferencesThis() { return this.referencesThis; } public void setHasInnerFunctions(boolean hasInnerFunctions) { this.hasInnerFunctions = hasInnerFunctions; } public boolean hasInnerFunctions() { return hasInnerFunctions; } void removeBlockInliningReferences() { Iterator> i; for (i = getReferencesInternal().entrySet().iterator(); i.hasNext(); ) { Entry entry = i.next(); if (entry.getValue().mode == InliningMode.BLOCK) { i.remove(); } } } public boolean hasBlockInliningReferences() { for (Reference r : getReferencesInternal().values()) { if (r.mode == InliningMode.BLOCK) { return true; } } return false; } public Function getFn() { return fn; } public void setFn(Function fn) { checkState(this.fn == null); this.fn = fn; } public Node getSafeFnNode() { return (safeFnNode != null) ? safeFnNode : fn.getFunctionNode(); } public void setSafeFnNode(Node safeFnNode) { this.safeFnNode = safeFnNode; } public boolean canInline() { return inline; } public void disallowInlining() { this.inline = false; // No need to keep references to function that can't be inlined. references = null; // Don't remove functions that we aren't inlining. remove = false; } public boolean canRemove() { return remove; } public void setRemove(boolean remove) { this.remove = remove; } public boolean canInlineDirectly() { return inlineDirectly; } public void inlineDirectly(boolean directReplacement) { this.inlineDirectly = directReplacement; } public boolean hasReferences() { return (references != null && !references.isEmpty()); } private Map getReferencesInternal() { if (references == null) { return ImmutableMap.of(); } return references; } public void addReference(Reference ref) { if (references == null) { references = new LinkedHashMap<>(); } references.put(ref.callNode, ref); } public Collection getReferences() { return getReferencesInternal().values(); } public Reference getReference(Node n) { return getReferencesInternal().get(n); } public ImmutableSet getNamesToAlias() { if (namesToAlias == null) { return ImmutableSet.of(); } return ImmutableSet.copyOf(namesToAlias); } public void setNamesToAlias(Set names) { namesToAlias = names; } public void setModule(JSChunk module) { this.module = module; } public JSChunk getModule() { return module; } } /** Interface for dealing with function declarations and function expressions equally */ private static interface Function { /** Gets the name of the function */ public String getName(); /** Gets the name node of the function */ public Node getNameNode(); /** Gets the function node */ public Node getFunctionNode(); /** Removes itself from the JavaScript */ public void remove(); public Node getDeclaringBlock(); } /** NamedFunction implementation of the Function interface */ private class NamedFunction implements Function { private final Node fn; public NamedFunction(Node fn) { this.fn = fn; } @Override public String getName() { return fn.getFirstChild().getString(); } @Override public Node getNameNode() { return fn.getFirstChild(); } @Override public Node getFunctionNode() { return fn; } @Override public void remove() { compiler.reportChangeToEnclosingScope(fn); NodeUtil.removeChild(fn.getParent(), fn); NodeUtil.markFunctionsDeleted(fn, compiler); } @Override public Node getDeclaringBlock() { return fn.getParent(); } } /** FunctionVar implementation of the Function interface */ private class FunctionVar implements Function { private final Node var; public FunctionVar(Node var) { this.var = var; } @Override public String getName() { return var.getFirstChild().getString(); } @Override public Node getNameNode() { return var.getFirstChild(); } @Override public Node getFunctionNode() { return var.getFirstFirstChild(); } @Override public void remove() { compiler.reportChangeToEnclosingScope(var); NodeUtil.removeChild(var.getParent(), var); NodeUtil.markFunctionsDeleted(var, compiler); } @Override public Node getDeclaringBlock() { return var.getParent(); } } /** FunctionExpression implementation of the Function interface */ private static class FunctionExpression implements Function { private final Node fn; private final String fakeName; private final Node fakeNameNode; public FunctionExpression(Node fn, int index) { this.fn = fn; // A number is not a valid function JavaScript identifier // so we don't need to worry about collisions. this.fakeName = String.valueOf(index); this.fakeNameNode = IR.name(fakeName); } @Override public String getName() { return fakeName; } @Override public Node getNameNode() { return fakeNameNode; } @Override public Node getFunctionNode() { return fn; } @Override public void remove() { // Nothing to do. The function is removed with the call. } @Override public Node getDeclaringBlock() { return null; } } static class Reference extends FunctionInjector.Reference { boolean requiresDecomposition = false; boolean inlined = false; Reference(Node callNode, Scope scope, JSChunk module, InliningMode mode) { super(callNode, scope, module, mode); } void setRequiresDecomposition(boolean newVal) { this.requiresDecomposition = newVal; } } }





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