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GNUCPPSourceParser.java
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GNUCPPSourceParser.java
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/*******************************************************************************
* Copyright (c) 2002, 2019 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:
* John Camelon (IBM Corporation) - initial API and implementation
* Markus Schorn (Wind River Systems)
* Bryan Wilkinson (QNX) - https://bugs.eclipse.org/bugs/show_bug.cgi?id=151207
* Ed Swartz (Nokia)
* Mike Kucera (IBM)
* Andrew Ferguson (Symbian)
* Sergey Prigogin (Google)
* Thomas Corbat (IFS)
* Anders Dahlberg (Ericsson) - bug 84144
* Nathan Ridge
* Richard Eames
* Alexander Nyßen (itemis AG) - bug 475908
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.cdt.core.dom.ast.ASTCompletionNode;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.DOMException;
import org.eclipse.cdt.core.dom.ast.IASTAlignmentSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTArrayDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTArrayModifier;
import org.eclipse.cdt.core.dom.ast.IASTArraySubscriptExpression;
import org.eclipse.cdt.core.dom.ast.IASTAttributeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTBinaryExpression;
import org.eclipse.cdt.core.dom.ast.IASTBinaryTypeIdExpression;
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.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTElaboratedTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTEqualsInitializer;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTForStatement;
import org.eclipse.cdt.core.dom.ast.IASTFunctionCallExpression;
import org.eclipse.cdt.core.dom.ast.IASTFunctionDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTIdExpression;
import org.eclipse.cdt.core.dom.ast.IASTInitializer;
import org.eclipse.cdt.core.dom.ast.IASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.IASTInitializerList;
import org.eclipse.cdt.core.dom.ast.IASTLiteralExpression;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNamedTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTPointer;
import org.eclipse.cdt.core.dom.ast.IASTPointerOperator;
import org.eclipse.cdt.core.dom.ast.IASTProblem;
import org.eclipse.cdt.core.dom.ast.IASTProblemDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTProblemTypeId;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTStatement;
import org.eclipse.cdt.core.dom.ast.IASTToken;
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.IASTUnaryExpression;
import org.eclipse.cdt.core.dom.ast.IASTWhileStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTAliasDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTAlignmentSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTAmbiguousTemplateArgument;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTArrayDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTArrayDesignator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTAttribute;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTAttributeList;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCapture;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCastExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCatchHandler;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTClassVirtSpecifier;
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.ICPPASTDesignatedInitializer;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDesignator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTElaboratedTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTEnumerationSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTEnumerationSpecifier.ScopeStyle;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExplicitTemplateInstantiation;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFieldDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFieldDesignator;
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.ICPPASTFunctionDeclarator.RefQualifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDefinition;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionWithTryBlock;
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.ICPPASTLambdaExpression.CaptureDefault;
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.ICPPASTName;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTNameSpecifier;
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.ICPPASTNaryTypeIdExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTNewExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTOperatorName;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTPackExpandable;
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.ICPPASTReferenceOperator;
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.ICPPASTStaticAssertDeclaration;
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.ICPPASTTemplateName;
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.ICPPASTTryBlockStatement;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTypeId;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTypeIdExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTypeTransformationSpecifier;
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.ICPPASTVirtSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTVirtSpecifier.SpecifierKind;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTVisibilityLabel;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPNodeFactory;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPUnaryTypeTransformation;
import org.eclipse.cdt.core.dom.ast.gnu.cpp.IGPPASTArrayRangeDesignator;
import org.eclipse.cdt.core.dom.parser.IExtensionToken;
import org.eclipse.cdt.core.dom.parser.cpp.ICPPParserExtensionConfiguration;
import org.eclipse.cdt.core.index.IIndex;
import org.eclipse.cdt.core.parser.EndOfFileException;
import org.eclipse.cdt.core.parser.IGCCToken;
import org.eclipse.cdt.core.parser.IParserLogService;
import org.eclipse.cdt.core.parser.IProblem;
import org.eclipse.cdt.core.parser.IScanner;
import org.eclipse.cdt.core.parser.IToken;
import org.eclipse.cdt.core.parser.IToken.ContextSensitiveTokenType;
import org.eclipse.cdt.core.parser.Keywords;
import org.eclipse.cdt.core.parser.ParserMode;
import org.eclipse.cdt.core.parser.util.ArrayUtil;
import org.eclipse.cdt.core.parser.util.CharArrayUtils;
import org.eclipse.cdt.core.parser.util.CollectionUtils;
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.ASTTranslationUnit;
import org.eclipse.cdt.internal.core.dom.parser.AbstractGNUSourceCodeParser;
import org.eclipse.cdt.internal.core.dom.parser.BacktrackException;
import org.eclipse.cdt.internal.core.dom.parser.DeclarationOptions;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguityParent;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguousDeclarator;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguousExpression;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguousStatement;
import org.eclipse.cdt.internal.core.dom.parser.cpp.NameOrTemplateIDVariants.BranchPoint;
import org.eclipse.cdt.internal.core.dom.parser.cpp.NameOrTemplateIDVariants.Variant;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor;
/**
* This is our implementation of the IParser interface, serving as a parser for
* GNU C and C++. From time to time we will make reference to the ANSI ISO
* specifications.
*/
public class GNUCPPSourceParser extends AbstractGNUSourceCodeParser {
private static final int DEFAULT_PARM_LIST_SIZE = 4;
private static final int DEFAULT_CATCH_HANDLER_LIST_SIZE = 4;
private static final int TEMPLATE_ARGUMENT_NESTING_DEPTH_LIMIT = 192;
// This is a parameter to the protected function {@link #declarator(DtorStrategy, DeclarationOptions)}
// so it needs to be protected too.
protected static enum DtorStrategy {
PREFER_FUNCTION, PREFER_NESTED
}
private final boolean allowCPPRestrict;
private final boolean supportExtendedTemplateSyntax;
private final boolean supportAutoTypeSpecifier;
private final boolean supportUserDefinedLiterals;
private final boolean supportGCCStyleDesignators;
private final IIndex index;
protected ICPPASTTranslationUnit translationUnit;
private int functionBodyCount;
private int templateArgumentNestingDepth = 0;
private char[] currentClassName;
private char[] additionalNumericalSuffixes;
private TemplateIdStrategy fTemplateParameterListStrategy;
private Map<String, ContextSensitiveTokenType> fContextSensitiveTokens;
public GNUCPPSourceParser(IScanner scanner, ParserMode mode, IParserLogService log,
ICPPParserExtensionConfiguration config) {
this(scanner, mode, log, config, null);
}
public GNUCPPSourceParser(IScanner scanner, ParserMode mode, IParserLogService log,
ICPPParserExtensionConfiguration config, IIndex index) {
super(scanner, log, mode, CPPNodeFactory.getDefault(), config.supportStatementsInExpressions(),
config.supportTypeofUnaryExpressions(), config.supportAlignOfUnaryExpression(), config.supportKnRC(),
config.supportAttributeSpecifiers(), config.supportDeclspecSpecifiers(),
config.getBuiltinBindingsProvider());
allowCPPRestrict = config.allowRestrictPointerOperators();
supportExtendedTemplateSyntax = config.supportExtendedTemplateSyntax();
supportParameterInfoBlock = config.supportParameterInfoBlock();
supportExtendedSizeofOperator = config.supportExtendedSizeofOperator();
supportFunctionStyleAsm = config.supportFunctionStyleAssembler();
supportGCCStyleDesignators = config.supportGCCStyleDesignators();
functionCallCanBeLValue = true;
supportAutoTypeSpecifier = true;
supportUserDefinedLiterals = config.supportUserDefinedLiterals();
this.index = index;
scanner.setSplitShiftROperator(true);
fContextSensitiveTokens = createContextSensitiveTokenMap(config);
additionalNumericalSuffixes = scanner.getAdditionalNumericLiteralSuffixes();
}
@Override
protected ICPPNodeFactory getNodeFactory() {
return (ICPPNodeFactory) super.getNodeFactory();
}
private Map<String, ContextSensitiveTokenType> createContextSensitiveTokenMap(
ICPPParserExtensionConfiguration config) {
Map<String, ContextSensitiveTokenType> result = new HashMap<>();
result.put(Keywords.OVERRIDE, ContextSensitiveTokenType.OVERRIDE);
result.put(Keywords.FINAL, ContextSensitiveTokenType.FINAL);
result.putAll(config.getAdditionalContextSensitiveKeywords());
return result;
}
private ContextSensitiveTokenType getContextSensitiveType(IToken token) {
if (!(token.getType() == IToken.tIDENTIFIER)) {
return null;
}
return fContextSensitiveTokens.get(new String(token.getCharImage()));
}
@Override
protected IASTName identifier() throws EndOfFileException, BacktrackException {
switch (LT(1)) {
case IToken.tIDENTIFIER:
case IToken.tCOMPLETION:
case IToken.tEOC:
return buildName(-1, consume(), false);
}
throw backtrack;
}
private ICPPASTNameSpecifier nameSpecifier() throws BacktrackException, EndOfFileException {
return ambiguousNameSpecifier(CastExprCtx.eNotInBExpr);
}
private ICPPASTNameSpecifier ambiguousNameSpecifier(CastExprCtx ctx) throws BacktrackException, EndOfFileException {
TemplateIdStrategy strat = new TemplateIdStrategy();
IToken m = mark();
while (true) {
try {
return nameSpecifier(ctx, strat);
} catch (BacktrackException e) {
if (e.isFatal()) {
throw e;
}
if (strat.setNextAlternative(true /* previous alternative failed to parse */)) {
backup(m);
} else {
throw e;
}
}
}
}
/**
* Parses a name specifier.
*/
private ICPPASTNameSpecifier nameSpecifier(CastExprCtx ctx, ITemplateIdStrategy strat)
throws BacktrackException, EndOfFileException {
if (strat == null)
return ambiguousNameSpecifier(ctx);
ICPPASTQualifiedName qname = null;
ICPPASTNameSpecifier nameSpec = null;
final int offset = LA(1).getOffset();
int endOffset = offset;
if (LT(1) == IToken.tCOLONCOLON) {
endOffset = consume().getEndOffset();
qname = getNodeFactory().newQualifiedName(null);
qname.setFullyQualified(true);
}
boolean mustBeLast = false;
boolean haveName = false;
loop: while (true) {
boolean keywordTemplate = false;
if (qname != null && LT(1) == IToken.t_template) {
consume();
keywordTemplate = true;
}
int destructorOffset = -1;
if (LT(1) == IToken.tBITCOMPLEMENT) {
destructorOffset = consume().getOffset();
mustBeLast = true;
}
switch (LT(1)) {
case IToken.tIDENTIFIER:
case IToken.tCOMPLETION:
case IToken.tEOC:
IToken nt = consume();
nameSpec = (ICPPASTName) buildName(destructorOffset, nt, keywordTemplate);
break;
case IToken.t_operator:
nameSpec = (ICPPASTName) operatorId();
break;
case IToken.t_decltype:
// A decltype-specifier must be the first component of a qualified name.
if (qname != null)
throwBacktrack(LA(1));
nameSpec = decltypeSpecifier();
break;
default:
if (!haveName || destructorOffset >= 0 || keywordTemplate) {
throwBacktrack(LA(1));
}
nameSpec = getNodeFactory().newName(CharArrayUtils.EMPTY);
if (qname != null) {
addNameSpecifier(qname, nameSpec);
}
break loop;
}
haveName = true;
// Check for template-id
if (nameSpec instanceof IASTName && LTcatchEOF(1) == IToken.tLT) {
IASTName name = (IASTName) nameSpec;
final boolean inBinaryExpression = ctx != CastExprCtx.eNotInBExpr;
final int haveArgs = haveTemplateArguments(inBinaryExpression);
boolean templateID = true;
if (!keywordTemplate) {
if (haveArgs == NO_TEMPLATE_ID) {
templateID = false;
} else if (haveArgs == AMBIGUOUS_TEMPLATE_ID) {
templateID = strat.shallParseAsTemplateID(name);
}
}
if (templateID) {
if (haveArgs == NO_TEMPLATE_ID)
throwBacktrack(LA(1));
nameSpec = (ICPPASTName) addTemplateArguments(name, strat);
}
}
endOffset = calculateEndOffset(nameSpec);
if (qname != null) {
addNameSpecifier(qname, nameSpec);
}
if (LTcatchEOF(1) != IToken.tCOLONCOLON)
break loop;
if (mustBeLast)
throwBacktrack(LA(1));
endOffset = consume().getEndOffset(); // ::
if (qname == null) {
qname = getNodeFactory().newQualifiedName(null);
addNameSpecifier(qname, nameSpec);
}
}
if (qname != null) {
setRange(qname, offset, endOffset);
nameSpec = qname;
}
return nameSpec;
}
private ICPPASTName qualifiedName() throws BacktrackException, EndOfFileException {
ICPPASTNameSpecifier nameSpec = nameSpecifier();
if (!(nameSpec instanceof ICPPASTName)) {
// decltype-specifier without following ::
throwBacktrack(nameSpec);
}
return (ICPPASTName) nameSpec;
}
/**
* Parses a qualified name.
*/
private ICPPASTName qualifiedName(CastExprCtx ctx, ITemplateIdStrategy strat)
throws BacktrackException, EndOfFileException {
ICPPASTNameSpecifier nameSpec = nameSpecifier(ctx, strat);
if (!(nameSpec instanceof ICPPASTName)) {
// decltype-specifier without following ::
throwBacktrack(nameSpec);
}
return (ICPPASTName) nameSpec;
}
private void addNameSpecifier(ICPPASTQualifiedName qname, ICPPASTNameSpecifier nameSpec) {
if (nameSpec instanceof IASTName)
qname.addName((IASTName) nameSpec);
else
qname.addNameSpecifier(nameSpec);
}
private IASTName buildName(int destructorOffset, IToken nt, boolean keywordTemplate) {
IASTName name;
if (destructorOffset < 0) {
if (keywordTemplate) {
name = getNodeFactory().newTemplateName(nt.getCharImage());
} else {
name = getNodeFactory().newName(nt.getCharImage());
}
setRange(name, nt.getOffset(), nt.getEndOffset());
} else {
char[] nchars = nt.getCharImage();
final int len = nchars.length;
char[] image = new char[len + 1];
image[0] = '~';
System.arraycopy(nchars, 0, image, 1, len);
name = getNodeFactory().newName(image);
setRange(name, destructorOffset, nt.getEndOffset());
}
switch (nt.getType()) {
case IToken.tEOC:
case IToken.tCOMPLETION:
ASTCompletionNode node = createCompletionNode(nt);
if (node != null)
node.addName(name);
break;
}
return name;
}
private IASTName addTemplateArguments(IASTName templateName, ITemplateIdStrategy strat)
throws EndOfFileException, BacktrackException {
// Parse for template arguments
consume(IToken.tLT);
List<IASTNode> list = templateArgumentList(strat);
IToken end = LA(1);
switch (end.getType()) {
case IToken.tGT_in_SHIFTR:
case IToken.tGT:
consume();
break;
case IToken.tEOC:
break;
default:
throw backtrack;
}
return buildTemplateID(templateName, end.getEndOffset(), list);
}
private ICPPASTTemplateId buildTemplateID(IASTName templateName, int endOffset, List<IASTNode> args) {
ICPPASTTemplateId result = getNodeFactory().newTemplateId(templateName);
setRange(result, ((ASTNode) templateName).getOffset(), endOffset);
for (IASTNode n : args) {
if (n instanceof IASTTypeId) {
result.addTemplateArgument((IASTTypeId) n);
} else if (n instanceof IASTExpression) {
result.addTemplateArgument((IASTExpression) n);
} else if (n instanceof ICPPASTAmbiguousTemplateArgument) {
result.addTemplateArgument((ICPPASTAmbiguousTemplateArgument) n);
}
}
return result;
}
/**
* Parses a decltype-specifier.
*/
private ICPPASTDecltypeSpecifier decltypeSpecifier() throws EndOfFileException, BacktrackException {
int start = consume(IToken.t_decltype).getOffset();
consume(IToken.tLPAREN);
ICPPASTExpression decltypeExpression = expression();
int end = consume(IToken.tRPAREN).getEndOffset();
ICPPASTDecltypeSpecifier decltypeSpec = getNodeFactory().newDecltypeSpecifier(decltypeExpression);
setRange(decltypeSpec, start, end);
return decltypeSpec;
}
/**
* Makes a fast check whether there could be template arguments.
* -1: no, 0: ambiguous, 1: yes
*/
private static final int NO_TEMPLATE_ID = -1;
private static final int AMBIGUOUS_TEMPLATE_ID = 0;
private static final int TEMPLATE_ID = 1;
private int haveTemplateArguments(boolean inBinaryExpression) throws EndOfFileException, BacktrackException {
final IToken mark = mark();
try {
consume();
int nk = 0;
int depth = 0;
int angleDepth = 1;
int limit = 10000;
while (--limit > 0) {
switch (consume().getType()) {
case IToken.tEOC:
case IToken.tCOMPLETION:
return AMBIGUOUS_TEMPLATE_ID;
case IToken.tLT:
if (nk == 0) {
angleDepth++;
}
break;
case IToken.tGT_in_SHIFTR:
case IToken.tGT:
if (nk == 0) {
--angleDepth;
if (!inBinaryExpression)
return angleDepth == 0 ? TEMPLATE_ID : AMBIGUOUS_TEMPLATE_ID;
int end = endsTemplateIDInBinaryExpression();
if (end == NO_TEMPLATE_ID) {
if (angleDepth == 0)
return NO_TEMPLATE_ID;
} else {
return AMBIGUOUS_TEMPLATE_ID;
}
}
break;
case IToken.tLBRACKET:
if (nk == 0) {
nk = IToken.tLBRACKET;
depth = 0;
} else if (nk == IToken.tLBRACKET) {
depth++;
}
break;
case IToken.tRBRACKET:
if (nk == IToken.tLBRACKET) {
if (--depth < 0) {
nk = 0;
}
}
break;
case IToken.tLPAREN:
if (nk == 0) {
nk = IToken.tLPAREN;
depth = 0;
} else if (nk == IToken.tLPAREN) {
depth++;
}
break;
case IToken.tRPAREN:
if (nk == IToken.tLPAREN) {
if (--depth < 0) {
nk = 0;
}
}
break;
// In C++11, braces can occur at the top level in a template-argument,
// if an object of class type is being created via uniform initialization,
// and that class type has a constexpr conversion operator to a type
// that's valid as the type of a non-type template parameter.
case IToken.tLBRACE:
if (nk == 0) {
nk = IToken.tLBRACE;
depth = 0;
} else if (nk == IToken.tLBRACE) {
depth++;
}
break;
case IToken.tRBRACE:
if (nk == 0) {
return NO_TEMPLATE_ID;
} else if (nk == IToken.tLBRACE) {
if (--depth < 0) {
nk = 0;
}
}
break;
case IToken.tSEMI:
if (nk == 0) {
return NO_TEMPLATE_ID;
}
break;
}
}
return AMBIGUOUS_TEMPLATE_ID;
} catch (EndOfFileException ignored) {
return NO_TEMPLATE_ID;
} finally {
backup(mark);
}
}
/**
* If '>' is followed by an expression, then it denotes the binary operator,
* else it is the end of a template-id, or special-cast.
*/
private int endsTemplateIDInBinaryExpression() {
int lt1 = LTcatchEOF(1);
switch (lt1) {
// Can be start of expression, or the scope operator applied to the template-id
case IToken.tCOLONCOLON: // 'CT<int>::member' or 'c<1 && 2 > ::g'
return AMBIGUOUS_TEMPLATE_ID;
// Can be start of expression or the function-call operator applied to a template-id
case IToken.tLPAREN: // 'ft<int>(args)' or 'c<1 && 2 > (x+y)'
return AMBIGUOUS_TEMPLATE_ID;
// Start of unary expression
case IToken.tMINUS:
case IToken.tPLUS:
case IToken.tAMPER:
case IToken.tSTAR:
case IToken.tNOT:
case IToken.tBITCOMPLEMENT:
case IToken.tINCR:
case IToken.tDECR:
case IToken.t_new:
case IToken.t_delete:
case IToken.t_sizeof:
case IToken.t_alignof:
case IGCCToken.t___alignof__:
return NO_TEMPLATE_ID;
// Start of a postfix expression
case IToken.t_typename:
case IToken.t_char:
case IToken.t_char16_t:
case IToken.t_char32_t:
case IToken.t_wchar_t:
case IToken.t_bool:
case IToken.t_short:
case IToken.t_int:
case IToken.t_long:
case IToken.t_signed:
case IToken.t_unsigned:
case IToken.t_float:
case IToken.t_double:
case IToken.t_dynamic_cast:
case IToken.t_static_cast:
case IToken.t_reinterpret_cast:
case IToken.t_const_cast:
case IToken.t_typeid:
return NO_TEMPLATE_ID;
// Start of a primary expression
case IToken.tINTEGER:
case IToken.tFLOATINGPT:
case IToken.tSTRING:
case IToken.tLSTRING:
case IToken.tUTF16STRING:
case IToken.tUTF32STRING:
case IToken.tCHAR:
case IToken.tLCHAR:
case IToken.tUTF16CHAR:
case IToken.tUTF32CHAR:
case IToken.t_false:
case IToken.t_true:
case IToken.t_this:
case IToken.tIDENTIFIER:
case IToken.t_operator:
case IToken.tCOMPLETION:
return NO_TEMPLATE_ID;
// Tokens that end an expression
case IToken.tSEMI:
case IToken.tCOMMA:
case IToken.tLBRACE:
case IToken.tRBRACE:
case IToken.tRBRACKET:
case IToken.tRPAREN:
case IToken.tELLIPSIS: // pack-expansion
case IToken.t_struct:
case IToken.t_class:
case IToken.t_template:
return TEMPLATE_ID;
// Binary operator
case IToken.tGT:
case IToken.tGT_in_SHIFTR:
case IToken.tEQUAL:
return TEMPLATE_ID;
default:
return AMBIGUOUS_TEMPLATE_ID;
}
}
private List<IASTNode> templateArgumentList(ITemplateIdStrategy strat)
throws EndOfFileException, BacktrackException {
if (templateArgumentNestingDepth >= TEMPLATE_ARGUMENT_NESTING_DEPTH_LIMIT) {
throwBacktrack(
createProblem(IProblem.TEMPLATE_ARGUMENT_NESTING_DEPTH_LIMIT_EXCEEDED, LA(1).getOffset(), 1));
}
++templateArgumentNestingDepth;
try {
int startingOffset = LA(1).getOffset();
int endOffset = 0;
List<IASTNode> list = null;
boolean needComma = false;
int lt1 = LT(1);
while (lt1 != IToken.tGT && lt1 != IToken.tGT_in_SHIFTR && lt1 != IToken.tEOC) {
if (needComma) {
if (lt1 != IToken.tCOMMA) {
throwBacktrack(startingOffset, endOffset - startingOffset);
}
consume();
} else {
needComma = true;
}
IASTNode node = templateArgument(strat);
if (list == null) {
list = new ArrayList<>();
}
list.add(node);
lt1 = LT(1);
}
if (list == null) {
return Collections.emptyList();
}
return list;
} finally {
--templateArgumentNestingDepth;
}
}
private IASTNode templateArgument(ITemplateIdStrategy strat) throws EndOfFileException, BacktrackException {
IToken argStart = mark();
int markBranchPoint = ((TemplateIdStrategy) strat).getCurrentBranchPoint();
ICPPASTTypeId typeId = null;
int lt1 = 0;
try {
typeId = typeId(DeclarationOptions.TYPEID, strat);
lt1 = LT(1);
} catch (BacktrackException e) {
if (e.isFatal()) {
throw e;
}
}
if (typeId != null && (lt1 == IToken.tCOMMA || lt1 == IToken.tGT || lt1 == IToken.tGT_in_SHIFTR
|| lt1 == IToken.tEOC || lt1 == IToken.tELLIPSIS)) {
// This is potentially a type-id, now check ambiguity with expression.
IToken typeIdEnd = mark();
IASTNamedTypeSpecifier namedTypeSpec = null;
IASTName name = null;
try {
// If the type-id consists of a name, that name could be or contain
// a template-id, with template arguments of its own, which can
// themselves be ambiguous. If we parse the name anew as an
// id-expression, our complexity becomes exponential in the nesting
// depth of template-ids (bug 316704). To avoid this, we do not
// re-parse the name, but instead synthesize an id-expression from
// it, and then continue parsing an expression from the id-expression
// onwards (as the id-expression could be the beginning of a larger
// expression).
IASTIdExpression idExpression = null;
IASTDeclSpecifier declSpec = typeId.getDeclSpecifier();
if (declSpec instanceof IASTNamedTypeSpecifier) {
namedTypeSpec = (IASTNamedTypeSpecifier) declSpec;
name = namedTypeSpec.getName();
if (name.contains(typeId)) {
idExpression = setRange(getNodeFactory().newIdExpression(name), name);
// If the name was one of the completion names, add it to the completion
// node again now that it has a new parent. This ensures that completion
// proposals are offered for both contexts that the name appears in.
ASTCompletionNode completionNode = (ASTCompletionNode) getCompletionNode();
if (completionNode != null && completionNode.containsName(name)) {
completionNode.addName(name);
}
}
}
// Parse an expression, starting with the id-expression synthesized
// above if there is one, otherwise starting from the beginning of
// the argument.
if (idExpression == null)
backup(argStart);
IASTExpression expression = expression(ExprKind.eAssignment, BinaryExprCtx.eInTemplateID, idExpression,
strat);
// At this point we have a valid type-id and a valid expression.
// We prefer the longer one.
if (!typeId.contains(expression)) {
// The expression is longer.
if (LT(1) == IToken.tELLIPSIS) {
expression = addPackExpansion(expression, consume());
}
return expression;
} else if (expression.contains(typeId)) {
// The two are of the same length - ambiguous.
if (LT(1) == IToken.tELLIPSIS) {
IToken ellipsis = consume();
addPackExpansion(typeId, ellipsis);
expression = addPackExpansion(expression, ellipsis);
}
ICPPASTAmbiguousTemplateArgument ambiguity = createAmbiguousTemplateArgument();
ambiguity.addTypeId(typeId);
ambiguity.addExpression(expression);
return ambiguity;
}
// The type-id is longer, use it.
} catch (BacktrackException e) {
if (e.isFatal()) {
throw e;
}
// Failed to parse an expression, use the type id.
}
// Clean up after our failed attempt to parse an expression.
backup(typeIdEnd);
if (name != null && namedTypeSpec != null) {
// When we synthesized the id-expression, it took ownership
// of the name. Give ownership back to the type-id.
namedTypeSpec.setName(name);
}
// Use the type-id.
if (LT(1) == IToken.tELLIPSIS) {
addPackExpansion(typeId, consume());
}
return typeId;
}
// Not a type-id, parse as expression.
backup(argStart);
((TemplateIdStrategy) strat).backupToBranchPoint(markBranchPoint);
IASTExpression expr = expression(ExprKind.eAssignment, BinaryExprCtx.eInTemplateID, null, strat);
if (LT(1) == IToken.tELLIPSIS) {
expr = addPackExpansion(expr, consume());
}
return expr;
}
private void addPackExpansion(ICPPASTTypeId typeId, IToken consume) {
final int endOffset = consume.getEndOffset();
adjustEndOffset(typeId, endOffset);
typeId.setIsPackExpansion(true);
}
private IASTExpression addPackExpansion(IASTExpression expr, IToken ellipsis) {
IASTExpression result = getNodeFactory().newPackExpansionExpression(expr);
return setRange(result, expr, ellipsis.getEndOffset());
}
private IASTName operatorId() throws BacktrackException, EndOfFileException {
final IToken firstToken = consume(IToken.t_operator);
int endOffset = firstToken.getEndOffset();
IASTTypeId typeId = null;
OverloadableOperator op = null;
final int lt1 = LT(1);
switch (lt1) {
case IToken.tLPAREN:
op = OverloadableOperator.PAREN; // operator ()
consume();
endOffset = consume(IToken.tRPAREN).getEndOffset();
break;
case IToken.tLBRACKET:
op = OverloadableOperator.BRACKET; // operator []
consume();
endOffset = consume(IToken.tRBRACKET).getEndOffset();
break;
case IToken.t_new:
case IToken.t_delete:
if (LT(2) == IToken.tLBRACKET) {
op = lt1 == IToken.t_new ? OverloadableOperator.NEW_ARRAY : OverloadableOperator.DELETE_ARRAY;
consume();
consume();
endOffset = consume(IToken.tRBRACKET).getEndOffset();
} else {
IToken t = consume();
endOffset = t.getEndOffset();
op = OverloadableOperator.valueOf(t);
}
break;
case IToken.tGT_in_SHIFTR:
consume();
endOffset = consume(IToken.tGT_in_SHIFTR).getEndOffset();
op = OverloadableOperator.SHIFTR;
break;
case IToken.tSTRING: // User defined literal T operator "" SUFFIX
{
IToken strOp = consume();
// Should be an empty string
if (strOp.getLength() == 2) {
endOffset = strOp.getEndOffset();
IToken udlOperator = identifierOrKeyword();
char[] operatorName = CharArrayUtils.concat(firstToken.getCharImage(), " ".toCharArray()); //$NON-NLS-1$
operatorName = CharArrayUtils.concat(operatorName, strOp.getCharImage());
operatorName = CharArrayUtils.concat(operatorName, udlOperator.getCharImage());
IASTName name = getNodeFactory().newOperatorName(operatorName);
setRange(name, firstToken.getOffset(), udlOperator.getEndOffset());
return name;
}
break;
}
case IToken.tUSER_DEFINED_STRING_LITERAL: // User defined literal T operator ""SUFFIX
{
IToken strOp = consume();
String image = strOp.getImage();
int startQuote = image.indexOf('"');
int endQuote = image.lastIndexOf('"');
if (startQuote != -1 && endQuote == startQuote + 1) {
char[] operatorName = CharArrayUtils.concat(firstToken.getCharImage(), " ".toCharArray()); //$NON-NLS-1$
operatorName = CharArrayUtils.concat(operatorName, strOp.getCharImage());
IASTName name = getNodeFactory().newOperatorName(operatorName);
setRange(name, firstToken.getOffset(), strOp.getEndOffset());
return name;
}
break;
}
default:
op = OverloadableOperator.valueOf(LA(1));
if (op != null) {
endOffset = consume().getEndOffset();
}
break;
}
if (op != null) {
IASTName name = getNodeFactory().newOperatorName(op.toCharArray());
setRange(name, firstToken.getOffset(), endOffset);
return name;
}
// must be a conversion function
typeId = typeId(DeclarationOptions.TYPEID_CONVERSION);
IASTName name = getNodeFactory().newConversionName(typeId);
setRange(name, firstToken.getOffset(), calculateEndOffset(typeId));
return name;
}
/**
* Information for the parser, whether a binary expression is parsed in the context of a
* template-id an ambiguous template-id (one where the '<' could be a greater sign) or
* else where.
*/
private enum BinaryExprCtx {
eInTemplateID, eNotInTemplateID
}
@Override
protected ICPPASTExpression expression() throws BacktrackException, EndOfFileException {
return expression(ExprKind.eExpression, BinaryExprCtx.eNotInTemplateID, null, null);
}
@Override
protected ICPPASTExpression constantExpression() throws BacktrackException, EndOfFileException {
return expression(ExprKind.eConstant, BinaryExprCtx.eNotInTemplateID, null, null);
}
private ICPPASTExpression expression(final ExprKind kind, final BinaryExprCtx ctx, IASTInitializerClause expr,