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CPPSemantics.java
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CPPSemantics.java
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/*******************************************************************************
* Copyright (c) 2004, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Andrew Niefer (IBM) - Initial API and implementation
* Markus Schorn (Wind River Systems)
* Bryan Wilkinson (QNX)
* Andrew Ferguson (Symbian)
* Sergey Prigogin (Google)
* Mike Kucera (IBM)
* Thomas Corbat (IFS)
* Nathan Ridge
* Richard Eames
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp.semantics;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.LVALUE;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.PRVALUE;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.ALLCVQ;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.ARRAY;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.CVTYPE;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.MPTR;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.PTR;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.REF;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.TDEF;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.calculateInheritanceDepth;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.getNestedType;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.getUltimateTypeUptoPointers;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.isConversionOperator;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.dom.IName;
import org.eclipse.cdt.core.dom.ast.ASTNodeProperty;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.DOMException;
import org.eclipse.cdt.core.dom.ast.EScopeKind;
import org.eclipse.cdt.core.dom.ast.IASTBinaryExpression;
import org.eclipse.cdt.core.dom.ast.IASTCastExpression;
import org.eclipse.cdt.core.dom.ast.IASTCompositeTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTCompoundStatement;
import org.eclipse.cdt.core.dom.ast.IASTDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTDeclarationStatement;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTElaboratedTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTEnumerationSpecifier.IASTEnumerator;
import org.eclipse.cdt.core.dom.ast.IASTEqualsInitializer;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory;
import org.eclipse.cdt.core.dom.ast.IASTFieldReference;
import org.eclipse.cdt.core.dom.ast.IASTFunctionCallExpression;
import org.eclipse.cdt.core.dom.ast.IASTFunctionDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTFunctionDefinition;
import org.eclipse.cdt.core.dom.ast.IASTIdExpression;
import org.eclipse.cdt.core.dom.ast.IASTImplicitNameOwner;
import org.eclipse.cdt.core.dom.ast.IASTInitializer;
import org.eclipse.cdt.core.dom.ast.IASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.IASTLabelStatement;
import org.eclipse.cdt.core.dom.ast.IASTLiteralExpression;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNameOwner;
import org.eclipse.cdt.core.dom.ast.IASTNamedTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTReturnStatement;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTStatement;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.IASTTypeId;
import org.eclipse.cdt.core.dom.ast.IASTTypeIdExpression;
import org.eclipse.cdt.core.dom.ast.IASTTypeIdInitializerExpression;
import org.eclipse.cdt.core.dom.ast.IASTUnaryExpression;
import org.eclipse.cdt.core.dom.ast.IBasicType;
import org.eclipse.cdt.core.dom.ast.IBasicType.Kind;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.ICompositeType;
import org.eclipse.cdt.core.dom.ast.IEnumeration;
import org.eclipse.cdt.core.dom.ast.IEnumerator;
import org.eclipse.cdt.core.dom.ast.IFunction;
import org.eclipse.cdt.core.dom.ast.IFunctionType;
import org.eclipse.cdt.core.dom.ast.IPointerType;
import org.eclipse.cdt.core.dom.ast.IProblemBinding;
import org.eclipse.cdt.core.dom.ast.IScope;
import org.eclipse.cdt.core.dom.ast.IScope.ScopeLookupData;
import org.eclipse.cdt.core.dom.ast.ISemanticProblem;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.ITypedef;
import org.eclipse.cdt.core.dom.ast.IVariable;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTAliasDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCapture;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCatchHandler;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCompositeTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCompositeTypeSpecifier.ICPPASTBaseSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTConstructorChainInitializer;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTConstructorInitializer;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTConversionName;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDecltypeSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeleteExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTEnumerationSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFieldReference;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTForStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDefinition;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTIfStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitCapture;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitializerList;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTLambdaExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTLinkageSpecification;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTLiteralExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTNamedTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTNamespaceAlias;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTNamespaceDefinition;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTNewExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTQualifiedName;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTRangeBasedForStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTSimpleDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTSimpleTypeConstructorExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTSimpleTypeTemplateParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTStructuredBindingDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTSwitchStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplateDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplateId;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplateParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplateSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplatedTypeTemplateParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTypeId;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTUnaryExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTUsingDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTUsingDirective;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTWhileStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPAliasTemplate;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPBase;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPBlockScope;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassScope;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplate;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplatePartialSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPConstructor;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPField;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionInstance;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionTemplate;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPMember;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPMethod;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPNamespace;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPNamespaceScope;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPPartialSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPPointerToMemberType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPReferenceType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPScope;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateArgument;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateDefinition;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateInstance;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateNonTypeParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateScope;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateTemplateParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateTypeParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPUsingDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPUsingDirective;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPVariable;
import org.eclipse.cdt.core.index.IIndex;
import org.eclipse.cdt.core.index.IIndexBinding;
import org.eclipse.cdt.core.index.IIndexFile;
import org.eclipse.cdt.core.index.IIndexFileSet;
import org.eclipse.cdt.core.index.IIndexName;
import org.eclipse.cdt.core.parser.util.ArrayUtil;
import org.eclipse.cdt.core.parser.util.CharArrayObjectMap;
import org.eclipse.cdt.core.parser.util.CharArrayUtils;
import org.eclipse.cdt.core.parser.util.CollectionUtils;
import org.eclipse.cdt.core.parser.util.DebugUtil;
import org.eclipse.cdt.core.parser.util.IUnaryPredicate;
import org.eclipse.cdt.core.parser.util.ObjectSet;
import org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode;
import org.eclipse.cdt.internal.core.dom.parser.ASTInternal;
import org.eclipse.cdt.internal.core.dom.parser.ASTNode;
import org.eclipse.cdt.internal.core.dom.parser.ASTQueries;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguousDeclarator;
import org.eclipse.cdt.internal.core.dom.parser.IASTInternalScope;
import org.eclipse.cdt.internal.core.dom.parser.IRecursionResolvingBinding;
import org.eclipse.cdt.internal.core.dom.parser.ITypeContainer;
import org.eclipse.cdt.internal.core.dom.parser.IntegralValue;
import org.eclipse.cdt.internal.core.dom.parser.ProblemBinding;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTIdExpression;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTLiteralExpression;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTName;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTNameBase;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTTranslationUnit;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPBasicType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPBuiltinParameter;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPCompositeBinding;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPDeferredConstructor;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPDeferredFunction;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPFunctionType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPImplicitFunction;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPNamespace;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPNamespaceScope;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPPointerType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPReferenceType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPScope;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateNonTypeArgument;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateParameterMap;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateTypeArgument;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPUnknownField;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPUnknownMemberClass;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPUnknownMethod;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPUsingDeclaration;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPUsingDirective;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPVariable;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPASTInternalScope;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPClassSpecializationScope;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPDeferredClassInstance;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPInternalBinding;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPInternalNamespaceScope;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPUnknownBinding;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPUnknownType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.OverloadableOperator;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPTemplates.TypeSelection;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.Conversions.Context;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.Conversions.UDCMode;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.Cost.Rank;
import org.eclipse.cdt.internal.core.pdom.dom.IPDOMAdaptedASTNode;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
/**
* Name resolution.
*/
public class CPPSemantics {
/**
* The maximum depth to search ancestors before assuming infinite looping.
*/
public static final int MAX_INHERITANCE_DEPTH = 40;
public static final String EMPTY_NAME = ""; //$NON-NLS-1$
public static final char[] OPERATOR_ = new char[] { 'o', 'p', 'e', 'r', 'a', 't', 'o', 'r', ' ' };
public static final IType VOID_TYPE = new CPPBasicType(Kind.eVoid, 0);
public static final IType INT_TYPE = new CPPBasicType(Kind.eInt, 0);
private static final char[] CALL_FUNCTION = "call-function".toCharArray(); //$NON-NLS-1$
private static final ICPPEvaluation[] NO_INITCLAUSE_EVALUATION = {};
// Set to true for debugging.
public static boolean traceBindingResolution = false;
public static int traceIndent = 0;
// special return value for costForFunctionCall
private static final FunctionCost CONTAINS_DEPENDENT_TYPES = new FunctionCost(null, 0);
// A regular expression for matching qualified names. This allows for optional global qualification
// (leading ::) and then separates the first part of the name from the rest (if present). There are
// three capture groups:
// (1) If the input name specifies the global namespace (leading ::) then capture group 1 will
// be ::. Group 1 will be null otherwise.
// (2) The text of the first component of the qualified name, including leading :: if present in
// the input string. Leading and trailing whitespace is trimmed. There is no effort to check
// that the name contains valid C++ identifier characters.
// (3) The text of everything after the first component of the qualified name.
//
// E.g., -- Input Name -- ---- Capture Groups ----
// "::nsA::nsB::b" => { "::", "nsA", "nsB::b" }
// "a" => { null, "a", null }
// ":: i" => { "::", "i", null }
private static final Pattern QUALNAME_REGEX = Pattern.compile("^\\s*(::)?\\s*([^\\s:]+)\\s*(?:::(.*))?$"); //$NON-NLS-1$
// This flag controls whether name lookup is allowed to find bindings in headers
// that are not reachable via includes from the file containing the name.
// Generally this is not allowed, but certain consumers, such as IncludeOrganizer,
// need it (since the whole point of IncludeOrganizer is to find missing headers).
private static final ThreadLocal<Boolean> fAllowPromiscuousBindingResolution = new ThreadLocal<>() {
@Override
protected Boolean initialValue() {
return false;
}
};
private static final ThreadLocal<Deque<IASTNode>> fLookupPoints = new ThreadLocal<>() {
@Override
protected Deque<IASTNode> initialValue() {
return new ArrayDeque<>();
}
};
public static void pushLookupPoint(IASTNode point) {
fLookupPoints.get().push(point);
}
public static void popLookupPoint() {
fLookupPoints.get().pop();
}
/**
* Get the current point of instantiation / point of lookup for name lookups.
*
* NOTE: This is meant to be used primarily for "declaredBefore" purposes, that is,
* for determining whether something was declared before or after the point
* of lookup. It is NOT meant to be used as a general mechanism for accessing
* information about a call site without having to pass that information along
* the usual way (via function arguments).
*/
public static IASTNode getCurrentLookupPoint() {
Deque<IASTNode> lookupPoints = fLookupPoints.get();
return lookupPoints.isEmpty() ? null : lookupPoints.peek();
}
static protected IBinding resolveBinding(IASTName name) {
if (traceBindingResolution) {
for (int i = 0; i < traceIndent; i++) {
System.out.print(" "); //$NON-NLS-1$
}
System.out.println("Resolving " + name + ':' + ((ASTNode) name).getOffset()); //$NON-NLS-1$
traceIndent++;
}
if (name instanceof CPPASTNameBase) {
((CPPASTNameBase) name).incResolutionDepth();
}
// 1: Get some context info off of the name to figure out what kind of lookup we want.
LookupData data = createLookupData(name);
IBinding binding;
pushLookupPoint(name);
try {
try {
// 2: Lookup
lookup(data, null);
// Perform argument dependent lookup
if (data.checkAssociatedScopes() && !data.hasTypeOrMemberFunctionOrVariableResult()) {
doArgumentDependentLookup(data);
}
} catch (DOMException e) {
data.problem = (ProblemBinding) e.getProblem();
}
if (data.problem != null)
return data.problem;
// 3: Resolve ambiguities
try {
binding = resolveAmbiguities(data);
} catch (DOMException e) {
binding = e.getProblem();
}
// 4: Post processing
binding = postResolution(binding, data);
} finally {
popLookupPoint();
}
if (traceBindingResolution) {
traceIndent--;
for (int i = 0; i < traceIndent; i++) {
System.out.print(" "); //$NON-NLS-1$
}
System.out.println("Resolved " + name + ':' + ((ASTNode) name).getOffset() + //$NON-NLS-1$
" to " + DebugUtil.toStringWithClass(binding) + ':' + System.identityHashCode(binding)); //$NON-NLS-1$
}
return binding;
}
protected static IBinding postResolution(IBinding binding, IASTName name) {
LookupData data = createLookupData(name);
return postResolution(binding, data);
}
private static IBinding postResolution(IBinding binding, LookupData data) {
final IASTName lookupName = data.getLookupName();
if (lookupName == null)
return binding;
// If this is the unqualified name of a function in a function call in a template and some
// of the function arguments are dependent, a matching function could be found via
// argument-dependent lookup at the point of instantiation.
if (binding == null || binding instanceof IProblemBinding) {
if (!data.qualified && data.isFunctionCall()
&& CPPTemplates.containsDependentType(data.getFunctionArgumentTypes())) {
binding = CPPDeferredFunction.createForName(lookupName.getSimpleID());
}
}
// If any name in the initializer refers to introduced names then declaration is ill-formed.
if (binding instanceof ICPPInternalBinding internalBinding && internalBinding.getDefinition() != null
&& internalBinding.getDefinition()
.getParent() instanceof ICPPASTStructuredBindingDeclaration declaration) {
IASTNode parent = lookupName.getParent();
while (parent != null) {
if (parent == declaration) {
binding = new ProblemBinding(lookupName, data.getLookupPoint(),
IProblemBinding.SEMANTIC_INVALID_STRUCTURED_BINDING_INITIALIZER, data.getFoundBindings());
break;
}
parent = parent.getParent();
}
}
if (binding instanceof IProblemBinding)
return binding;
IASTNode lookupPoint = data.getLookupPoint();
if (binding == null && data.checkClassContainingFriend()) {
// 3.4.1-10 If we don't find a name used in a friend declaration in the member
// declaration's class, we should look in the class granting friendship.
IASTNode parent = lookupName.getParent();
while (parent != null && !(parent instanceof ICPPASTCompositeTypeSpecifier)) {
parent = parent.getParent();
}
if (parent instanceof ICPPASTCompositeTypeSpecifier) {
IScope scope = ((ICPPASTCompositeTypeSpecifier) parent).getScope();
try {
lookup(data, scope);
binding = resolveAmbiguities(data);
} catch (DOMException e) {
binding = e.getProblem();
}
}
}
// Explicit type conversion in functional notation.
if (binding instanceof ICPPClassTemplate && lookupName instanceof ICPPASTTemplateId) {
final IASTNode parent = lookupName.getParent();
if (parent instanceof IASTIdExpression
&& parent.getPropertyInParent() == IASTFunctionCallExpression.FUNCTION_NAME) {
return binding;
}
}
/* 14.6.1-1:
* Within the scope of a class template, when the name of the template is neither qualified
* nor followed by <, it is equivalent to the name followed by the template arguments
* enclosed in <>.
*/
if (binding instanceof ICPPClassTemplate && !(binding instanceof ICPPClassSpecialization)
&& !(binding instanceof ICPPTemplateParameter) && !(lookupName instanceof ICPPASTTemplateId)) {
ASTNodeProperty prop = lookupName.getPropertyInParent();
if (prop != ICPPASTTemplateId.TEMPLATE_NAME && !lookupName.isQualified()) {
// You cannot use a class template name outside of the class template scope,
// mark it as a problem.
IBinding user = CPPTemplates.isUsedInClassTemplateScope((ICPPClassTemplate) binding, lookupName);
if (user instanceof ICPPClassTemplate) {
binding = ((ICPPClassTemplate) user).asDeferredInstance();
} else if (user != null) {
binding = user;
} else {
boolean ok = false;
IASTNode node = lookupName.getParent();
while (node != null && !ok) {
if (node instanceof ICPPASTTemplateId
|| node instanceof ICPPASTTemplatedTypeTemplateParameter) {
ok = true; // Can be argument or default-value for template template parameter
break;
} else if (node instanceof IASTElaboratedTypeSpecifier) {
IASTNode parent = node.getParent();
if (parent instanceof IASTSimpleDeclaration) {
IASTDeclSpecifier declspec = ((IASTSimpleDeclaration) parent).getDeclSpecifier();
if (declspec instanceof ICPPASTDeclSpecifier) {
if (((ICPPASTDeclSpecifier) declspec).isFriend()) {
ok = true; // A friend class template declarations uses resolution.
break;
}
}
}
}
node = node.getParent();
}
if (!ok) {
binding = new ProblemBinding(lookupName, lookupPoint, IProblemBinding.SEMANTIC_INVALID_TYPE,
data.getFoundBindings());
}
}
}
} else if (binding instanceof ICPPDeferredClassInstance) {
// Try to replace binding by the one pointing to the enclosing template declaration.
ICPPDeferredClassInstance dcl = (ICPPDeferredClassInstance) binding;
IBinding usedHere = CPPTemplates.isUsedInClassTemplateScope(dcl.getClassTemplate(), lookupName);
if (usedHere instanceof ICPPClassTemplatePartialSpecialization) {
if (CPPTemplates.areSameArguments(
((ICPPClassTemplatePartialSpecialization) usedHere).getTemplateArguments(),
dcl.getTemplateArguments()))
binding = ((ICPPClassTemplatePartialSpecialization) usedHere).asDeferredInstance();
} else if (usedHere instanceof ICPPClassTemplate) {
if (CPPTemplates.areSameArguments(
CPPTemplates.templateParametersAsArguments((ICPPClassTemplate) usedHere),
dcl.getTemplateArguments())) {
binding = ((ICPPClassTemplate) usedHere).asDeferredInstance();
}
}
}
if (binding instanceof IType) {
IType t = getNestedType((IType) binding, TDEF);
if (t instanceof ICPPClassType && convertClassToConstructor(lookupName)) {
ICPPClassType cls = (ICPPClassType) t;
if (cls instanceof IIndexBinding) {
cls = data.getTranslationUnit().mapToAST(cls);
}
try {
if (lookupName instanceof ICPPASTTemplateId && cls instanceof ICPPClassTemplate) {
if (data.getTranslationUnit() != null) {
ICPPASTTemplateId id = (ICPPASTTemplateId) lookupName;
ICPPTemplateArgument[] args = CPPTemplates.createTemplateArgumentArray(id);
IBinding inst = CPPTemplates.instantiate((ICPPClassTemplate) cls, args);
if (inst instanceof ICPPClassType) {
cls = (ICPPClassType) inst;
}
}
}
if (cls instanceof ICPPUnknownBinding) {
binding = new CPPDeferredConstructor(cls);
} else {
// Do not interpret template arguments to a template class as being
// explicit template arguments to its templated constructor.
data.setTemplateArguments(null);
binding = resolveFunction(data, cls.getConstructors(), true, false);
}
} catch (DOMException e) {
return e.getProblem();
}
}
}
IASTName name = lookupName;
IASTNode nameParent = name.getParent();
if (nameParent instanceof ICPPASTTemplateId) {
if (binding instanceof ICPPTemplateInstance) {
final ICPPTemplateInstance instance = (ICPPTemplateInstance) binding;
binding = instance.getSpecializedBinding();
name.setBinding(binding);
((ICPPASTTemplateId) nameParent).setBinding(instance);
}
name = (ICPPASTTemplateId) nameParent;
nameParent = name.getParent();
}
boolean isNestedNameSpecifier = false;
if (nameParent instanceof ICPPASTQualifiedName) {
if (name == ((ICPPASTQualifiedName) nameParent).getLastName()) {
name = (IASTName) nameParent;
nameParent = name.getParent();
} else {
isNestedNameSpecifier = true;
}
}
// If the lookup in base-classes ran into a deferred instance, use the computed unknown
// binding.
final ASTNodeProperty namePropertyInParent = name.getPropertyInParent();
if (binding == null && data.skippedScope != null) {
if (isNestedNameSpecifier || namePropertyInParent == IASTNamedTypeSpecifier.NAME) {
binding = new CPPUnknownMemberClass(data.skippedScope, name.getSimpleID());
} else if (data.isFunctionCall()) {
binding = new CPPUnknownMethod(data.skippedScope, name.getSimpleID());
} else {
binding = new CPPUnknownField(data.skippedScope, name.getSimpleID());
}
}
if (binding != null) {
if (namePropertyInParent == IASTNamedTypeSpecifier.NAME) {
if (!(binding instanceof IType || binding instanceof ICPPConstructor)) {
IASTNode parent = name.getParent().getParent();
if (parent instanceof IASTTypeId
&& parent.getPropertyInParent() == ICPPASTTemplateId.TEMPLATE_ID_ARGUMENT) {
if (!(binding instanceof IType)) {
// A type id needs to hold a type.
binding = new ProblemBinding(lookupName, lookupPoint, IProblemBinding.SEMANTIC_INVALID_TYPE,
data.getFoundBindings());
}
// Don't create a problem here.
} else {
binding = new ProblemBinding(lookupName, lookupPoint, IProblemBinding.SEMANTIC_INVALID_TYPE,
data.getFoundBindings());
}
}
} else if (namePropertyInParent == IASTIdExpression.ID_NAME) {
if (binding instanceof IType) {
final IASTNode idExpr = name.getParent();
ASTNodeProperty pip = idExpr.getPropertyInParent();
if (pip == ICPPASTTemplatedTypeTemplateParameter.DEFAULT_VALUE) {
// Default for template template parameter is a type.
} else if (pip == IASTFunctionCallExpression.FUNCTION_NAME) {
// Explicit type conversion in functional notation.
} else if (pip == IASTUnaryExpression.OPERAND && ((ICPPASTUnaryExpression) idExpr.getParent())
.getOperator() == IASTUnaryExpression.op_sizeofParameterPack) {
// Argument of sizeof... can be a type
} else {
binding = new ProblemBinding(lookupName, lookupPoint, IProblemBinding.SEMANTIC_INVALID_TYPE,
data.getFoundBindings());
}
}
}
}
// Some declarations are found via name resolution (e.g. when using a qualified name),
// add name as definition and check the declaration specifier.
final IASTDeclaration declaration = data.forDeclaration();
if (declaration != null) {
// Functions
if (binding instanceof IFunction) {
binding = checkDeclSpecifier(binding, lookupName, declaration);
if (!(binding instanceof IProblemBinding)) {
if (declaration instanceof ICPPASTFunctionDefinition) {
ASTInternal.addDefinition(binding, lookupName);
}
}
}
// Definitions of static fields.
if (binding instanceof ICPPField && lookupName.isDefinition()) {
if (declaration.getPropertyInParent() != IASTCompositeTypeSpecifier.MEMBER_DECLARATION) {
ASTInternal.addDefinition(binding, lookupName);
}
}
}
// If the result is a virtual method called without explicit qualification, and we can determine a
// unique final overrider for it in the hierarchy of the method call's implied object type, replace
// the method with its final overrider.
if (!(lookupName.getParent() instanceof ICPPASTQualifiedName) && binding instanceof ICPPMethod
&& ((ICPPMethod) binding).isVirtual()) {
IType impliedObjectType = data.getImpliedObjectType();
if (impliedObjectType instanceof ICPPClassType) {
ICPPMethod finalOverrider = CPPInheritance.getFinalOverrider((ICPPMethod) binding,
(ICPPClassType) impliedObjectType);
if (finalOverrider != null) {
binding = finalOverrider;
}
}
}
// If we're still null...
if (binding == null) {
if (name instanceof ICPPASTQualifiedName && declaration != null) {
binding = new ProblemBinding(lookupName, lookupPoint,
IProblemBinding.SEMANTIC_MEMBER_DECLARATION_NOT_FOUND, data.getFoundBindings());
} else {
binding = new ProblemBinding(lookupName, lookupPoint, IProblemBinding.SEMANTIC_NAME_NOT_FOUND,
data.getFoundBindings());
}
}
return binding;
}
private static boolean convertClassToConstructor(IASTName name) {
if (name == null)
return false;
final ASTNodeProperty propertyInParent = name.getPropertyInParent();
if (propertyInParent == null)
return false;
if (propertyInParent == ICPPASTTemplateId.TEMPLATE_NAME)
return false;
IASTNode parent = name.getParent();
if (parent instanceof ICPPASTQualifiedName) {
if (((ICPPASTQualifiedName) parent).getLastName() != name)
return false;
parent = parent.getParent();
}
if (parent instanceof ICPPASTConstructorChainInitializer) {
return true;
}
return false;
}
public static void doArgumentDependentLookup(LookupData data) throws DOMException {
data.ignoreUsingDirectives = true;
// Set 'qualified' to true for the duration of this function call so the calls to lookup()
// don't ascend into enclosing scopes.
boolean originalQualified = data.qualified;
data.qualified = true;
data.setArgumentDependent(true);
Set<ICPPFunction> friendFns = new HashSet<>(2);
Set<ICPPNamespaceScope> associated = getAssociatedScopes(data, friendFns);
for (ICPPNamespaceScope scope : associated) {
if (!data.visited.containsKey(scope)) {
lookup(data, scope);
}
}
Object[] matchingFriendFns = CollectionUtils.filter(friendFns, new NameMatcherPredicate(data.getLookupKey()))
.toArray();
mergeResults(data, matchingFriendFns, false);
data.qualified = originalQualified;
data.setArgumentDependent(false);
}
private static class NameMatcherPredicate implements IUnaryPredicate<ICPPFunction> {
private char[] fKey;
public NameMatcherPredicate(char[] key) {
fKey = key;
}
@Override
public boolean apply(ICPPFunction argument) {
return Arrays.equals(argument.getNameCharArray(), fKey);
}
}
static IBinding checkDeclSpecifier(IBinding binding, IASTName name, IASTNode decl) {
// Check for empty declaration specifiers.
if (!isCtorOrConversionOperator(binding)) {
IASTDeclSpecifier declspec = null;
if (decl instanceof IASTSimpleDeclaration) {
declspec = ((IASTSimpleDeclaration) decl).getDeclSpecifier();
} else if (decl instanceof IASTFunctionDefinition) {
declspec = ((IASTFunctionDefinition) decl).getDeclSpecifier();
}
if (declspec != null && CPPVisitor.doesNotSpecifyType(declspec)) {
binding = new ProblemBinding(name, IProblemBinding.SEMANTIC_INVALID_TYPE);
}
}
return binding;
}
private static boolean isCtorOrConversionOperator(IBinding binding) {
if (binding instanceof ICPPConstructor)
return true;
if (binding instanceof ICPPMethod) {
ICPPMethod m = (ICPPMethod) binding;
if (m.isDestructor())
return true;
return isConversionOperator(m);
}
return false;
}
public static LookupData createLookupData(IASTName name) {
LookupData data = new LookupData(name);
IASTNode parent = name.getParent();
if (parent instanceof ICPPASTTemplateId)
parent = parent.getParent();
if (parent instanceof ICPPASTQualifiedName)
parent = parent.getParent();
if (parent instanceof IASTDeclarator && parent.getPropertyInParent() == IASTSimpleDeclaration.DECLARATOR) {
IASTSimpleDeclaration simple = (IASTSimpleDeclaration) parent.getParent();
if (simple.getDeclSpecifier().getStorageClass() == IASTDeclSpecifier.sc_typedef)
data.qualified = true;
}
if (parent instanceof IASTIdExpression) {
IASTNode grand = parent.getParent();
while (grand instanceof IASTUnaryExpression
&& ((IASTUnaryExpression) grand).getOperator() == IASTUnaryExpression.op_bracketedPrimary) {
parent = grand;
grand = grand.getParent();
}
if (parent.getPropertyInParent() == IASTFunctionCallExpression.FUNCTION_NAME) {
parent = parent.getParent();
IASTInitializerClause[] args = ((IASTFunctionCallExpression) parent).getArguments();
data.setFunctionArguments(false, args);
}
} else if (parent instanceof ICPPASTFieldReference) {
IASTNode grand = parent.getParent();
while (grand instanceof IASTUnaryExpression
&& ((IASTUnaryExpression) grand).getOperator() == IASTUnaryExpression.op_bracketedPrimary) {
parent = grand;
grand = grand.getParent();
}
if (parent.getPropertyInParent() == IASTFunctionCallExpression.FUNCTION_NAME) {
IASTInitializerClause[] exp = ((IASTFunctionCallExpression) parent.getParent()).getArguments();
data.setFunctionArguments(false, exp);
}
} else if (parent instanceof ICPPASTNamedTypeSpecifier && parent.getParent() instanceof IASTTypeId) {
IASTTypeId typeId = (IASTTypeId) parent.getParent();
if (typeId.getParent() instanceof ICPPASTNewExpression) {
ICPPASTNewExpression newExp = (ICPPASTNewExpression) typeId.getParent();
IASTInitializer init = newExp.getInitializer();
if (init == null) {
data.setFunctionArguments(false, NO_INITCLAUSE_EVALUATION);
} else if (init instanceof ICPPASTConstructorInitializer) {
data.setFunctionArguments(false, ((ICPPASTConstructorInitializer) init).getArguments());
} else if (init instanceof ICPPASTInitializerList) {
data.setFunctionArguments(false, (ICPPASTInitializerList) init);
}
}
} else if (parent instanceof ICPPASTConstructorChainInitializer) {
ICPPASTConstructorChainInitializer ctorinit = (ICPPASTConstructorChainInitializer) parent;
IASTInitializer init = ctorinit.getInitializer();
if (init instanceof ICPPASTConstructorInitializer) {
data.setFunctionArguments(false, ((ICPPASTConstructorInitializer) init).getArguments());
} else if (init instanceof ICPPASTInitializerList) {
data.setFunctionArguments(false, (ICPPASTInitializerList) init);
}
}
return data;
}
private static Set<ICPPNamespaceScope> getAssociatedScopes(LookupData data, Set<ICPPFunction> friendFns) {
if (!data.hasFunctionArguments())
return Collections.emptySet();
IType[] ps = data.getFunctionArgumentTypes();
Set<ICPPNamespaceScope> namespaces = new HashSet<>(2);
ObjectSet<IType> handled = new ObjectSet<>(2);
for (IType p : ps) {
try {
getAssociatedScopes(p, namespaces, friendFns, handled, data.getTranslationUnit(), true);
} catch (DOMException e) {
}
}
IASTName lookupName = data.getLookupName();
if (lookupName != null) {
final char[] simpleID = lookupName.getSimpleID();
if (CharArrayUtils.equals(CPPVisitor.BEGIN, simpleID) || CharArrayUtils.equals(CPPVisitor.END, simpleID)) {
IASTNode parent = lookupName.getParent(); // id-expression
if (parent != null)
parent = parent.getParent(); // function call
if (parent != null)
parent = parent.getParent(); // the loop
if (parent instanceof ICPPASTRangeBasedForStatement) {
IASTTranslationUnit tu = parent.getTranslationUnit();
IBinding[] std = tu.getScope().find(CPPVisitor.STD, tu);
for (IBinding binding : std) {
if (binding instanceof ICPPNamespace) {
namespaces.add(((ICPPNamespace) binding).getNamespaceScope());
}
}
}
}
}
return namespaces;
}
// 3.4.2-2
private static void getAssociatedScopes(IType t, Set<ICPPNamespaceScope> namespaces, Set<ICPPFunction> friendFns,
ObjectSet<IType> handled, CPPASTTranslationUnit tu, boolean lookInBaseClasses) throws DOMException {
t = getNestedType(t, TDEF | CVTYPE | PTR | ARRAY | REF);
// No point getting namespaces associated with a dependent type - we don't know what they
// are yet.
if (CPPTemplates.isDependentType(t))
return;
if (t instanceof IBinding) {
if (handled.containsKey(t))
return;
handled.put(t);
if (t instanceof IEnumeration) {
// [basic.lookup.argdep] p2.3: an enumeration's only associated namespace
// is the innermost enclosing namespace of its declaration.
getAssociatedNamespaceScopes(getContainingNamespaceScope((IBinding) t, tu), namespaces);
} else {
IBinding owner = ((IBinding) t).getOwner();
if (owner instanceof ICPPClassType) {
getAssociatedScopes((IType) owner, namespaces, friendFns, handled, tu,
false /* do not look at base classes of the enclosing class */);
} else {
getAssociatedNamespaceScopes(getContainingNamespaceScope((IBinding) t, tu), namespaces);
}
}
}
if (t instanceof ICPPClassType && !(t instanceof ICPPClassTemplate)) {
ICPPClassType ct = (ICPPClassType) t;
if (lookInBaseClasses) {
ICPPBase[] bases = ct.getBases();
for (ICPPBase base : bases) {
IBinding b = base.getBaseClass();
if (b instanceof IType)
getAssociatedScopes((IType) b, namespaces, friendFns, handled, tu, true);
}
}
// Furthermore, if T is a class template ...
// * ... types of the template arguments for template type parameters
// (excluding template template parameters);
// * ... owners of which any template template arguments are members;
if (ct instanceof ICPPSpecialization) {
for (IBinding friend : ct.getFriends()) {
if (friend instanceof ICPPFunction) {
friendFns.add((ICPPFunction) friend);
}
}
if (ct instanceof ICPPTemplateInstance) {
ICPPTemplateArgument[] args = ((ICPPTemplateInstance) ct).getTemplateArguments();
for (ICPPTemplateArgument arg : args) {
if (arg.isTypeValue()) {
getAssociatedScopes(arg.getTypeValue(), namespaces, friendFns, handled, tu, true);
}
}
}
}
} else if (t instanceof IFunctionType) {
IFunctionType ft = (IFunctionType) t;
getAssociatedScopes(ft.getReturnType(), namespaces, friendFns, handled, tu, true);
IType[] ps = ft.getParameterTypes();
for (IType pt : ps) {
getAssociatedScopes(pt, namespaces, friendFns, handled, tu, true);
}
} else if (t instanceof ICPPPointerToMemberType) {
final ICPPPointerToMemberType pmt = (ICPPPointerToMemberType) t;
getAssociatedScopes(pmt.getMemberOfClass(), namespaces, friendFns, handled, tu, true);
getAssociatedScopes(pmt.getType(), namespaces, friendFns, handled, tu, true);
} else if (t instanceof FunctionSetType) {
FunctionSetType fst = (FunctionSetType) t;
for (ICPPFunction fn : fst.getFunctionSet().getBindings()) {
getAssociatedScopes(fn.getType(), namespaces, friendFns, handled, tu, true);
}
}
}
private static ICPPNamespaceScope getContainingNamespaceScope(IBinding binding, CPPASTTranslationUnit tu)
throws DOMException {
if (binding == null)
return null;
IScope scope = binding.getScope();
scope = SemanticUtil.mapToAST(scope, tu);
while (scope != null && !(scope instanceof ICPPNamespaceScope)) {
scope = getParentScope(scope, tu);
}
return (ICPPNamespaceScope) scope;
}
public static void getAssociatedNamespaceScopes(ICPPNamespaceScope scope, Set<ICPPNamespaceScope> namespaces) {
if (scope == null || !namespaces.add(scope))
return;
if (scope instanceof ICPPInternalNamespaceScope) {
final ICPPInternalNamespaceScope internalScope = (ICPPInternalNamespaceScope) scope;
for (ICPPNamespaceScope mem : internalScope.getEnclosingNamespaceSet()) {
namespaces.add(mem);
}
}
}
public static ICPPScope getLookupScope(IASTName name) {
IASTNode parent = name.getParent();
IScope scope = null;
if (parent instanceof ICPPASTBaseSpecifier) {
ICPPASTCompositeTypeSpecifier compSpec = (ICPPASTCompositeTypeSpecifier) parent.getParent();
IASTName n = compSpec.getName();
if (n instanceof ICPPASTQualifiedName) {
n = n.getLastName();
}
scope = CPPVisitor.getContainingScope(n);
} else {
scope = CPPVisitor.getContainingScope(name);
}
if (scope instanceof ICPPScope) {
return (ICPPScope) scope;
} else if (scope instanceof IProblemBinding) {
return new CPPScope.CPPScopeProblem(((IProblemBinding) scope).getASTNode(),
IProblemBinding.SEMANTIC_BAD_SCOPE, ((IProblemBinding) scope).getNameCharArray());
}
return new CPPScope.CPPScopeProblem(name, IProblemBinding.SEMANTIC_BAD_SCOPE);
}
private static void mergeResults(LookupData data, Object results, boolean scoped) {
if (!data.contentAssist) {
if (results instanceof IBinding) {
data.foundItems = ArrayUtil.append(Object.class, (Object[]) data.foundItems, results);
} else if (results instanceof Object[]) {
data.foundItems = ArrayUtil.addAll(Object.class, (Object[]) data.foundItems, (Object[]) results);
}
} else {
@SuppressWarnings("unchecked")
final CharArrayObjectMap<Object> oldItems = (CharArrayObjectMap<Object>) data.foundItems;
data.foundItems = mergePrefixResults(oldItems, results, scoped);
}
}
/**
* @param dest
* @param source : either Object[] or CharArrayObjectMap
* @param scoped
* @return
*/
static CharArrayObjectMap<Object> mergePrefixResults(CharArrayObjectMap<Object> dest, Object source,