CbC/CbC_llvm: clang/lib/Parse/ParseExpr.cpp comparison

comparison clang/lib/Parse/ParseExpr.cpp @ 150:1d019706d866

LLVM10

author	anatofuz
date	Thu, 13 Feb 2020 15:10:13 +0900
parents
children	e8a9b4f4d755 0572611fdcc8

comparison

equal deleted inserted replaced

-:c2174574ed3a
+:1d019706d866
+//===--- ParseExpr.cpp - Expression Parsing -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Provides the Expression parsing implementation.
+///
+/// Expressions in C99 basically consist of a bunch of binary operators with
+/// unary operators and other random stuff at the leaves.
+///
+/// In the C99 grammar, these unary operators bind tightest and are represented
+/// as the 'cast-expression' production.  Everything else is either a binary
+/// operator (e.g. '/') or a ternary operator ("?:").  The unary leaves are
+/// handled by ParseCastExpression, the higher level pieces are handled by
+/// ParseBinaryExpression.
+///
+//===----------------------------------------------------------------------===//
+#include "clang/Parse/Parser.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/Basic/PrettyStackTrace.h"
+#include "clang/Parse/RAIIObjectsForParser.h"
+#include "clang/Sema/DeclSpec.h"
+#include "clang/Sema/ParsedTemplate.h"
+#include "clang/Sema/Scope.h"
+#include "clang/Sema/TypoCorrection.h"
+#include "llvm/ADT/SmallVector.h"
+using namespace clang;
+/// Simple precedence-based parser for binary/ternary operators.
+///
+/// Note: we diverge from the C99 grammar when parsing the assignment-expression
+/// production.  C99 specifies that the LHS of an assignment operator should be
+/// parsed as a unary-expression, but consistency dictates that it be a
+/// conditional-expession.  In practice, the important thing here is that the
+/// LHS of an assignment has to be an l-value, which productions between
+/// unary-expression and conditional-expression don't produce.  Because we want
+/// consistency, we parse the LHS as a conditional-expression, then check for
+/// l-value-ness in semantic analysis stages.
+///
+/// \verbatim
+///       pm-expression: [C++ 5.5]
+///         cast-expression
+///         pm-expression '.*' cast-expression
+///         pm-expression '->*' cast-expression
+///
+///       multiplicative-expression: [C99 6.5.5]
+///     Note: in C++, apply pm-expression instead of cast-expression
+///         cast-expression
+///         multiplicative-expression '*' cast-expression
+///         multiplicative-expression '/' cast-expression
+///         multiplicative-expression '%' cast-expression
+///
+///       additive-expression: [C99 6.5.6]
+///         multiplicative-expression
+///         additive-expression '+' multiplicative-expression
+///         additive-expression '-' multiplicative-expression
+///
+///       shift-expression: [C99 6.5.7]
+///         additive-expression
+///         shift-expression '<<' additive-expression
+///         shift-expression '>>' additive-expression
+///
+///       compare-expression: [C++20 expr.spaceship]
+///         shift-expression
+///         compare-expression '<=>' shift-expression
+///
+///       relational-expression: [C99 6.5.8]
+///         compare-expression
+///         relational-expression '<' compare-expression
+///         relational-expression '>' compare-expression
+///         relational-expression '<=' compare-expression
+///         relational-expression '>=' compare-expression
+///
+///       equality-expression: [C99 6.5.9]
+///         relational-expression
+///         equality-expression '==' relational-expression
+///         equality-expression '!=' relational-expression
+///
+///       AND-expression: [C99 6.5.10]
+///         equality-expression
+///         AND-expression '&' equality-expression
+///
+///       exclusive-OR-expression: [C99 6.5.11]
+///         AND-expression
+///         exclusive-OR-expression '^' AND-expression
+///
+///       inclusive-OR-expression: [C99 6.5.12]
+///         exclusive-OR-expression
+///         inclusive-OR-expression '|' exclusive-OR-expression
+///
+///       logical-AND-expression: [C99 6.5.13]
+///         inclusive-OR-expression
+///         logical-AND-expression '&&' inclusive-OR-expression
+///
+///       logical-OR-expression: [C99 6.5.14]
+///         logical-AND-expression
+///         logical-OR-expression '||' logical-AND-expression
+///
+///       conditional-expression: [C99 6.5.15]
+///         logical-OR-expression
+///         logical-OR-expression '?' expression ':' conditional-expression
+/// [GNU]   logical-OR-expression '?' ':' conditional-expression
+/// [C++] the third operand is an assignment-expression
+///
+///       assignment-expression: [C99 6.5.16]
+///         conditional-expression
+///         unary-expression assignment-operator assignment-expression
+/// [C++]   throw-expression [C++ 15]
+///
+///       assignment-operator: one of
+///         = *= /= %= += -= <<= >>= &= ^= |=
+///
+///       expression: [C99 6.5.17]
+///         assignment-expression ...[opt]
+///         expression ',' assignment-expression ...[opt]
+/// \endverbatim
+ExprResult Parser::ParseExpression(TypeCastState isTypeCast) {
+ExprResult LHS(ParseAssignmentExpression(isTypeCast));
+return ParseRHSOfBinaryExpression(LHS, prec::Comma);
+}
+/// This routine is called when the '@' is seen and consumed.
+/// Current token is an Identifier and is not a 'try'. This
+/// routine is necessary to disambiguate \@try-statement from,
+/// for example, \@encode-expression.
+///
+ExprResult
+Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) {
+ExprResult LHS(ParseObjCAtExpression(AtLoc));
+return ParseRHSOfBinaryExpression(LHS, prec::Comma);
+}
+/// This routine is called when a leading '__extension__' is seen and
+/// consumed.  This is necessary because the token gets consumed in the
+/// process of disambiguating between an expression and a declaration.
+ExprResult
+Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
+ExprResult LHS(true);
+{
+// Silence extension warnings in the sub-expression
+ExtensionRAIIObject O(Diags);
+LHS = ParseCastExpression(AnyCastExpr);
+}
+if (!LHS.isInvalid())
+LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__,
+LHS.get());
+return ParseRHSOfBinaryExpression(LHS, prec::Comma);
+}
+/// Parse an expr that doesn't include (top-level) commas.
+ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) {
+if (Tok.is(tok::code_completion)) {
+Actions.CodeCompleteExpression(getCurScope(),
+PreferredType.get(Tok.getLocation()));
+cutOffParsing();
+return ExprError();
+}
+if (Tok.is(tok::kw_throw))
+return ParseThrowExpression();
+if (Tok.is(tok::kw_co_yield))
+return ParseCoyieldExpression();
+ExprResult LHS = ParseCastExpression(AnyCastExpr,
+/*isAddressOfOperand=*/false,
+isTypeCast);
+return ParseRHSOfBinaryExpression(LHS, prec::Assignment);
+}
+/// Parse an assignment expression where part of an Objective-C message
+/// send has already been parsed.
+///
+/// In this case \p LBracLoc indicates the location of the '[' of the message
+/// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating
+/// the receiver of the message.
+///
+/// Since this handles full assignment-expression's, it handles postfix
+/// expressions and other binary operators for these expressions as well.
+ExprResult
+Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
+SourceLocation SuperLoc,
+ParsedType ReceiverType,
+Expr *ReceiverExpr) {
+ExprResult R
+= ParseObjCMessageExpressionBody(LBracLoc, SuperLoc,
+ReceiverType, ReceiverExpr);
+R = ParsePostfixExpressionSuffix(R);
+return ParseRHSOfBinaryExpression(R, prec::Assignment);
+}
+ExprResult
+Parser::ParseConstantExpressionInExprEvalContext(TypeCastState isTypeCast) {
+assert(Actions.ExprEvalContexts.back().Context ==
+Sema::ExpressionEvaluationContext::ConstantEvaluated &&
+"Call this function only if your ExpressionEvaluationContext is "
+"already ConstantEvaluated");
+ExprResult LHS(ParseCastExpression(AnyCastExpr, false, isTypeCast));
+ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
+return Actions.ActOnConstantExpression(Res);
+}
+ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) {
+// C++03 [basic.def.odr]p2:
+//   An expression is potentially evaluated unless it appears where an
+//   integral constant expression is required (see 5.19) [...].
+// C++98 and C++11 have no such rule, but this is only a defect in C++98.
+EnterExpressionEvaluationContext ConstantEvaluated(
+Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
+return ParseConstantExpressionInExprEvalContext(isTypeCast);
+}
+ExprResult Parser::ParseCaseExpression(SourceLocation CaseLoc) {
+EnterExpressionEvaluationContext ConstantEvaluated(
+Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
+ExprResult LHS(ParseCastExpression(AnyCastExpr, false, NotTypeCast));
+ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
+return Actions.ActOnCaseExpr(CaseLoc, Res);
+}
+/// Parse a constraint-expression.
+///
+/// \verbatim
+///       constraint-expression: C++2a[temp.constr.decl]p1
+///         logical-or-expression
+/// \endverbatim
+ExprResult Parser::ParseConstraintExpression() {
+EnterExpressionEvaluationContext ConstantEvaluated(
+Actions, Sema::ExpressionEvaluationContext::Unevaluated);
+ExprResult LHS(ParseCastExpression(AnyCastExpr));
+ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::LogicalOr));
+if (Res.isUsable() && !Actions.CheckConstraintExpression(Res.get())) {
+Actions.CorrectDelayedTyposInExpr(Res);
+return ExprError();
+}
+return Res;
+}
+/// \brief Parse a constraint-logical-and-expression.
+///
+/// \verbatim
+///       C++2a[temp.constr.decl]p1
+///       constraint-logical-and-expression:
+///         primary-expression
+///         constraint-logical-and-expression '&&' primary-expression
+///
+/// \endverbatim
+ExprResult
+Parser::ParseConstraintLogicalAndExpression(bool IsTrailingRequiresClause) {
+EnterExpressionEvaluationContext ConstantEvaluated(
+Actions, Sema::ExpressionEvaluationContext::Unevaluated);
+bool NotPrimaryExpression = false;
+auto ParsePrimary = [&] () {
+ExprResult E = ParseCastExpression(PrimaryExprOnly,
+/*isAddressOfOperand=*/false,
+/*isTypeCast=*/NotTypeCast,
+/*isVectorLiteral=*/false,
+&NotPrimaryExpression);
+if (E.isInvalid())
+return ExprError();
+auto RecoverFromNonPrimary = [&] (ExprResult E, bool Note) {
+E = ParsePostfixExpressionSuffix(E);
+// Use InclusiveOr, the precedence just after '&&' to not parse the
+// next arguments to the logical and.
+E = ParseRHSOfBinaryExpression(E, prec::InclusiveOr);
+if (!E.isInvalid())
+Diag(E.get()->getExprLoc(),
+Note
+? diag::note_unparenthesized_non_primary_expr_in_requires_clause
+: diag::err_unparenthesized_non_primary_expr_in_requires_clause)
+<< FixItHint::CreateInsertion(E.get()->getBeginLoc(), "(")
+<< FixItHint::CreateInsertion(
+PP.getLocForEndOfToken(E.get()->getEndLoc()), ")")
+<< E.get()->getSourceRange();
+return E;
+};
+if (NotPrimaryExpression ||
+// Check if the following tokens must be a part of a non-primary
+// expression
+getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
+/*CPlusPlus11=*/true) > prec::LogicalAnd ||
+// Postfix operators other than '(' (which will be checked for in
+// CheckConstraintExpression).
+Tok.isOneOf(tok::period, tok::plusplus, tok::minusminus) ||
+(Tok.is(tok::l_square) && !NextToken().is(tok::l_square))) {
+E = RecoverFromNonPrimary(E, /*Note=*/false);
+if (E.isInvalid())
+return ExprError();
+NotPrimaryExpression = false;
+}
+bool PossibleNonPrimary;
+bool IsConstraintExpr =
+Actions.CheckConstraintExpression(E.get(), Tok, &PossibleNonPrimary,
+IsTrailingRequiresClause);
+if (!IsConstraintExpr || PossibleNonPrimary) {
+// Atomic constraint might be an unparenthesized non-primary expression
+// (such as a binary operator), in which case we might get here (e.g. in
+// 'requires 0 + 1 && true' we would now be at '+', and parse and ignore
+// the rest of the addition expression). Try to parse the rest of it here.
+if (PossibleNonPrimary)
+E = RecoverFromNonPrimary(E, /*Note=*/!IsConstraintExpr);
+Actions.CorrectDelayedTyposInExpr(E);
+return ExprError();
+}
+return E;
+};
+ExprResult LHS = ParsePrimary();
+if (LHS.isInvalid())
+return ExprError();
+while (Tok.is(tok::ampamp)) {
+SourceLocation LogicalAndLoc = ConsumeToken();
+ExprResult RHS = ParsePrimary();
+if (RHS.isInvalid()) {
+Actions.CorrectDelayedTyposInExpr(LHS);
+return ExprError();
+}
+ExprResult Op = Actions.ActOnBinOp(getCurScope(), LogicalAndLoc,
+tok::ampamp, LHS.get(), RHS.get());
+if (!Op.isUsable()) {
+Actions.CorrectDelayedTyposInExpr(RHS);
+Actions.CorrectDelayedTyposInExpr(LHS);
+return ExprError();
+}
+LHS = Op;
+}
+return LHS;
+}
+/// \brief Parse a constraint-logical-or-expression.
+///
+/// \verbatim
+///       C++2a[temp.constr.decl]p1
+///       constraint-logical-or-expression:
+///         constraint-logical-and-expression
+///         constraint-logical-or-expression '||'
+///             constraint-logical-and-expression
+///
+/// \endverbatim
+ExprResult
+Parser::ParseConstraintLogicalOrExpression(bool IsTrailingRequiresClause) {
+ExprResult LHS(ParseConstraintLogicalAndExpression(IsTrailingRequiresClause));
+if (!LHS.isUsable())
+return ExprError();
+while (Tok.is(tok::pipepipe)) {
+SourceLocation LogicalOrLoc = ConsumeToken();
+ExprResult RHS =
+ParseConstraintLogicalAndExpression(IsTrailingRequiresClause);
+if (!RHS.isUsable()) {
+Actions.CorrectDelayedTyposInExpr(LHS);
+return ExprError();
+}
+ExprResult Op = Actions.ActOnBinOp(getCurScope(), LogicalOrLoc,
+tok::pipepipe, LHS.get(), RHS.get());
+if (!Op.isUsable()) {
+Actions.CorrectDelayedTyposInExpr(RHS);
+Actions.CorrectDelayedTyposInExpr(LHS);
+return ExprError();
+}
+LHS = Op;
+}
+return LHS;
+}
+bool Parser::isNotExpressionStart() {
+tok::TokenKind K = Tok.getKind();
+if (K == tok::l_brace || K == tok::r_brace  ||
+K == tok::kw_for  || K == tok::kw_while ||
+K == tok::kw_if   || K == tok::kw_else  ||
+K == tok::kw_goto || K == tok::kw_try)
+return true;
+// If this is a decl-specifier, we can't be at the start of an expression.
+return isKnownToBeDeclarationSpecifier();
+}
+bool Parser::isFoldOperator(prec::Level Level) const {
+return Level > prec::Unknown && Level != prec::Conditional &&
+Level != prec::Spaceship;
+}
+bool Parser::isFoldOperator(tok::TokenKind Kind) const {
+return isFoldOperator(getBinOpPrecedence(Kind, GreaterThanIsOperator, true));
+}
+/// Parse a binary expression that starts with \p LHS and has a
+/// precedence of at least \p MinPrec.
+ExprResult
+Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
+prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(),
+GreaterThanIsOperator,
+getLangOpts().CPlusPlus11);
+SourceLocation ColonLoc;
+auto SavedType = PreferredType;
+while (1) {
+// Every iteration may rely on a preferred type for the whole expression.
+PreferredType = SavedType;
+// If this token has a lower precedence than we are allowed to parse (e.g.
+// because we are called recursively, or because the token is not a binop),
+// then we are done!
+if (NextTokPrec < MinPrec)
+return LHS;
+// Consume the operator, saving the operator token for error reporting.
+Token OpToken = Tok;
+ConsumeToken();
+if (OpToken.is(tok::caretcaret)) {
+return ExprError(Diag(Tok, diag::err_opencl_logical_exclusive_or));
+}
+// If we're potentially in a template-id, we may now be able to determine
+// whether we're actually in one or not.
+if (OpToken.isOneOf(tok::comma, tok::greater, tok::greatergreater,
+tok::greatergreatergreater) &&
+checkPotentialAngleBracketDelimiter(OpToken))
+return ExprError();
+// Bail out when encountering a comma followed by a token which can't
+// possibly be the start of an expression. For instance:
+//   int f() { return 1, }
+// We can't do this before consuming the comma, because
+// isNotExpressionStart() looks at the token stream.
+if (OpToken.is(tok::comma) && isNotExpressionStart()) {
+PP.EnterToken(Tok, /*IsReinject*/true);
+Tok = OpToken;
+return LHS;
+}
+// If the next token is an ellipsis, then this is a fold-expression. Leave
+// it alone so we can handle it in the paren expression.
+if (isFoldOperator(NextTokPrec) && Tok.is(tok::ellipsis)) {
+// FIXME: We can't check this via lookahead before we consume the token
+// because that tickles a lexer bug.
+PP.EnterToken(Tok, /*IsReinject*/true);
+Tok = OpToken;
+return LHS;
+}
+// In Objective-C++, alternative operator tokens can be used as keyword args
+// in message expressions. Unconsume the token so that it can reinterpreted
+// as an identifier in ParseObjCMessageExpressionBody. i.e., we support:
+//   [foo meth:0 and:0];
+//   [foo not_eq];
+if (getLangOpts().ObjC && getLangOpts().CPlusPlus &&
+Tok.isOneOf(tok::colon, tok::r_square) &&
+OpToken.getIdentifierInfo() != nullptr) {
+PP.EnterToken(Tok, /*IsReinject*/true);
+Tok = OpToken;
+return LHS;
+}
+// Special case handling for the ternary operator.
+ExprResult TernaryMiddle(true);
+if (NextTokPrec == prec::Conditional) {
+if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
+// Parse a braced-init-list here for error recovery purposes.
+SourceLocation BraceLoc = Tok.getLocation();
+TernaryMiddle = ParseBraceInitializer();
+if (!TernaryMiddle.isInvalid()) {
+Diag(BraceLoc, diag::err_init_list_bin_op)
+<< /*RHS*/ 1 << PP.getSpelling(OpToken)
+<< Actions.getExprRange(TernaryMiddle.get());
+TernaryMiddle = ExprError();
+}
+} else if (Tok.isNot(tok::colon)) {
+// Don't parse FOO:BAR as if it were a typo for FOO::BAR.
+ColonProtectionRAIIObject X(*this);
+// Handle this production specially:
+//   logical-OR-expression '?' expression ':' conditional-expression
+// In particular, the RHS of the '?' is 'expression', not
+// 'logical-OR-expression' as we might expect.
+TernaryMiddle = ParseExpression();
+} else {
+// Special case handling of "X ? Y : Z" where Y is empty:
+//   logical-OR-expression '?' ':' conditional-expression   [GNU]
+TernaryMiddle = nullptr;
+Diag(Tok, diag::ext_gnu_conditional_expr);
+}
+if (TernaryMiddle.isInvalid()) {
+Actions.CorrectDelayedTyposInExpr(LHS);
+LHS = ExprError();
+TernaryMiddle = nullptr;
+}
+if (!TryConsumeToken(tok::colon, ColonLoc)) {
+// Otherwise, we're missing a ':'.  Assume that this was a typo that
+// the user forgot. If we're not in a macro expansion, we can suggest
+// a fixit hint. If there were two spaces before the current token,
+// suggest inserting the colon in between them, otherwise insert ": ".
+SourceLocation FILoc = Tok.getLocation();
+const char *FIText = ": ";
+const SourceManager &SM = PP.getSourceManager();
+if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) {
+assert(FILoc.isFileID());
+bool IsInvalid = false;
+const char *SourcePtr =
+SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid);
+if (!IsInvalid && *SourcePtr == ' ') {
+SourcePtr =
+SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid);
+if (!IsInvalid && *SourcePtr == ' ') {
+FILoc = FILoc.getLocWithOffset(-1);
+FIText = ":";
+}
+}
+}
+Diag(Tok, diag::err_expected)
+<< tok::colon << FixItHint::CreateInsertion(FILoc, FIText);
+Diag(OpToken, diag::note_matching) << tok::question;
+ColonLoc = Tok.getLocation();
+}
+}
+PreferredType.enterBinary(Actions, Tok.getLocation(), LHS.get(),
+OpToken.getKind());
+// Parse another leaf here for the RHS of the operator.
+// ParseCastExpression works here because all RHS expressions in C have it
+// as a prefix, at least. However, in C++, an assignment-expression could
+// be a throw-expression, which is not a valid cast-expression.
+// Therefore we need some special-casing here.
+// Also note that the third operand of the conditional operator is
+// an assignment-expression in C++, and in C++11, we can have a
+// braced-init-list on the RHS of an assignment. For better diagnostics,
+// parse as if we were allowed braced-init-lists everywhere, and check that
+// they only appear on the RHS of assignments later.
+ExprResult RHS;
+bool RHSIsInitList = false;
+if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
+RHS = ParseBraceInitializer();
+RHSIsInitList = true;
+} else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional)
+RHS = ParseAssignmentExpression();
+else
+RHS = ParseCastExpression(AnyCastExpr);
+if (RHS.isInvalid()) {
+// FIXME: Errors generated by the delayed typo correction should be
+// printed before errors from parsing the RHS, not after.
+Actions.CorrectDelayedTyposInExpr(LHS);
+if (TernaryMiddle.isUsable())
+TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
+LHS = ExprError();
+}
+// Remember the precedence of this operator and get the precedence of the
+// operator immediately to the right of the RHS.
+prec::Level ThisPrec = NextTokPrec;
+NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
+getLangOpts().CPlusPlus11);
+// Assignment and conditional expressions are right-associative.
+bool isRightAssoc = ThisPrec == prec::Conditional ||
+ThisPrec == prec::Assignment;
+// Get the precedence of the operator to the right of the RHS.  If it binds
+// more tightly with RHS than we do, evaluate it completely first.
+if (ThisPrec < NextTokPrec ||
+(ThisPrec == NextTokPrec && isRightAssoc)) {
+if (!RHS.isInvalid() && RHSIsInitList) {
+Diag(Tok, diag::err_init_list_bin_op)
+<< /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get());
+RHS = ExprError();
+}
+// If this is left-associative, only parse things on the RHS that bind
+// more tightly than the current operator.  If it is left-associative, it
+// is okay, to bind exactly as tightly.  For example, compile A=B=C=D as
+// A=(B=(C=D)), where each paren is a level of recursion here.
+// The function takes ownership of the RHS.
+RHS = ParseRHSOfBinaryExpression(RHS,
+static_cast<prec::Level>(ThisPrec + !isRightAssoc));
+RHSIsInitList = false;
+if (RHS.isInvalid()) {
+// FIXME: Errors generated by the delayed typo correction should be
+// printed before errors from ParseRHSOfBinaryExpression, not after.
+Actions.CorrectDelayedTyposInExpr(LHS);
+if (TernaryMiddle.isUsable())
+TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
+LHS = ExprError();
+}
+NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
+getLangOpts().CPlusPlus11);
+}
+if (!RHS.isInvalid() && RHSIsInitList) {
+if (ThisPrec == prec::Assignment) {
+Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists)
+<< Actions.getExprRange(RHS.get());
+} else if (ColonLoc.isValid()) {
+Diag(ColonLoc, diag::err_init_list_bin_op)
+<< /*RHS*/1 << ":"
+<< Actions.getExprRange(RHS.get());
+LHS = ExprError();
+} else {
+Diag(OpToken, diag::err_init_list_bin_op)
+<< /*RHS*/1 << PP.getSpelling(OpToken)
+<< Actions.getExprRange(RHS.get());
+LHS = ExprError();
+}
+}
+ExprResult OrigLHS = LHS;
+if (!LHS.isInvalid()) {
+// Combine the LHS and RHS into the LHS (e.g. build AST).
+if (TernaryMiddle.isInvalid()) {
+// If we're using '>>' as an operator within a template
+// argument list (in C++98), suggest the addition of
+// parentheses so that the code remains well-formed in C++0x.
+if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater))
+SuggestParentheses(OpToken.getLocation(),
+diag::warn_cxx11_right_shift_in_template_arg,
+SourceRange(Actions.getExprRange(LHS.get()).getBegin(),
+Actions.getExprRange(RHS.get()).getEnd()));
+LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(),
+OpToken.getKind(), LHS.get(), RHS.get());
+} else {
+LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
+LHS.get(), TernaryMiddle.get(),
+RHS.get());
+}
+// In this case, ActOnBinOp or ActOnConditionalOp performed the
+// CorrectDelayedTyposInExpr check.
+if (!getLangOpts().CPlusPlus)
+continue;
+}
+// Ensure potential typos aren't left undiagnosed.
+if (LHS.isInvalid()) {
+Actions.CorrectDelayedTyposInExpr(OrigLHS);
+Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
+Actions.CorrectDelayedTyposInExpr(RHS);
+}
+}
+}
+/// Parse a cast-expression, unary-expression or primary-expression, based
+/// on \p ExprType.
+///
+/// \p isAddressOfOperand exists because an id-expression that is the
+/// operand of address-of gets special treatment due to member pointers.
+///
+ExprResult Parser::ParseCastExpression(CastParseKind ParseKind,
+bool isAddressOfOperand,
+TypeCastState isTypeCast,
+bool isVectorLiteral,
+bool *NotPrimaryExpression) {
+bool NotCastExpr;
+ExprResult Res = ParseCastExpression(ParseKind,
+isAddressOfOperand,
+NotCastExpr,
+isTypeCast,
+isVectorLiteral,
+NotPrimaryExpression);
+if (NotCastExpr)
+Diag(Tok, diag::err_expected_expression);
+return Res;
+}
+namespace {
+class CastExpressionIdValidator final : public CorrectionCandidateCallback {
+public:
+CastExpressionIdValidator(Token Next, bool AllowTypes, bool AllowNonTypes)
+: NextToken(Next), AllowNonTypes(AllowNonTypes) {
+WantTypeSpecifiers = WantFunctionLikeCasts = AllowTypes;
+}
+bool ValidateCandidate(const TypoCorrection &candidate) override {
+NamedDecl *ND = candidate.getCorrectionDecl();
+if (!ND)
+return candidate.isKeyword();
+if (isa<TypeDecl>(ND))
+return WantTypeSpecifiers;
+if (!AllowNonTypes || !CorrectionCandidateCallback::ValidateCandidate(candidate))
+return false;
+if (!NextToken.isOneOf(tok::equal, tok::arrow, tok::period))
+return true;
+for (auto *C : candidate) {
+NamedDecl *ND = C->getUnderlyingDecl();
+if (isa<ValueDecl>(ND) && !isa<FunctionDecl>(ND))
+return true;
+}
+return false;
+}
+std::unique_ptr<CorrectionCandidateCallback> clone() override {
+return std::make_unique<CastExpressionIdValidator>(*this);
+}
+private:
+Token NextToken;
+bool AllowNonTypes;
+};
+}
+/// Parse a cast-expression, or, if \pisUnaryExpression is true, parse
+/// a unary-expression.
+///
+/// \p isAddressOfOperand exists because an id-expression that is the operand
+/// of address-of gets special treatment due to member pointers. NotCastExpr
+/// is set to true if the token is not the start of a cast-expression, and no
+/// diagnostic is emitted in this case and no tokens are consumed.
+///
+/// \verbatim
+///       cast-expression: [C99 6.5.4]
+///         unary-expression
+///         '(' type-name ')' cast-expression
+///
+///       unary-expression:  [C99 6.5.3]
+///         postfix-expression
+///         '++' unary-expression
+///         '--' unary-expression
+/// [Coro]  'co_await' cast-expression
+///         unary-operator cast-expression
+///         'sizeof' unary-expression
+///         'sizeof' '(' type-name ')'
+/// [C++11] 'sizeof' '...' '(' identifier ')'
+/// [GNU]   '__alignof' unary-expression
+/// [GNU]   '__alignof' '(' type-name ')'
+/// [C11]   '_Alignof' '(' type-name ')'
+/// [C++11] 'alignof' '(' type-id ')'
+/// [GNU]   '&&' identifier
+/// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7]
+/// [C++]   new-expression
+/// [C++]   delete-expression
+///
+///       unary-operator: one of
+///         '&'  '*'  '+'  '-'  '~'  '!'
+/// [GNU]   '__extension__'  '__real'  '__imag'
+///
+///       primary-expression: [C99 6.5.1]
+/// [C99]   identifier
+/// [C++]   id-expression
+///         constant
+///         string-literal
+/// [C++]   boolean-literal  [C++ 2.13.5]
+/// [C++11] 'nullptr'        [C++11 2.14.7]
+/// [C++11] user-defined-literal
+///         '(' expression ')'
+/// [C11]   generic-selection
+/// [C++2a] requires-expression
+///         '__func__'        [C99 6.4.2.2]
+/// [GNU]   '__FUNCTION__'
+/// [MS]    '__FUNCDNAME__'
+/// [MS]    'L__FUNCTION__'
+/// [MS]    '__FUNCSIG__'
+/// [MS]    'L__FUNCSIG__'
+/// [GNU]   '__PRETTY_FUNCTION__'
+/// [GNU]   '(' compound-statement ')'
+/// [GNU]   '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
+/// [GNU]   '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
+/// [GNU]   '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
+///                                     assign-expr ')'
+/// [GNU]   '__builtin_FILE' '(' ')'
+/// [GNU]   '__builtin_FUNCTION' '(' ')'
+/// [GNU]   '__builtin_LINE' '(' ')'
+/// [CLANG] '__builtin_COLUMN' '(' ')'
+/// [GNU]   '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
+/// [GNU]   '__null'
+/// [OBJC]  '[' objc-message-expr ']'
+/// [OBJC]  '\@selector' '(' objc-selector-arg ')'
+/// [OBJC]  '\@protocol' '(' identifier ')'
+/// [OBJC]  '\@encode' '(' type-name ')'
+/// [OBJC]  objc-string-literal
+/// [C++]   simple-type-specifier '(' expression-list[opt] ')'      [C++ 5.2.3]
+/// [C++11] simple-type-specifier braced-init-list                  [C++11 5.2.3]
+/// [C++]   typename-specifier '(' expression-list[opt] ')'         [C++ 5.2.3]
+/// [C++11] typename-specifier braced-init-list                     [C++11 5.2.3]
+/// [C++]   'const_cast' '<' type-name '>' '(' expression ')'       [C++ 5.2p1]
+/// [C++]   'dynamic_cast' '<' type-name '>' '(' expression ')'     [C++ 5.2p1]
+/// [C++]   'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
+/// [C++]   'static_cast' '<' type-name '>' '(' expression ')'      [C++ 5.2p1]
+/// [C++]   'typeid' '(' expression ')'                             [C++ 5.2p1]
+/// [C++]   'typeid' '(' type-id ')'                                [C++ 5.2p1]
+/// [C++]   'this'          [C++ 9.3.2]
+/// [G++]   unary-type-trait '(' type-id ')'
+/// [G++]   binary-type-trait '(' type-id ',' type-id ')'           [TODO]
+/// [EMBT]  array-type-trait '(' type-id ',' integer ')'
+/// [clang] '^' block-literal
+///
+///       constant: [C99 6.4.4]
+///         integer-constant
+///         floating-constant
+///         enumeration-constant -> identifier
+///         character-constant
+///
+///       id-expression: [C++ 5.1]
+///                   unqualified-id
+///                   qualified-id
+///
+///       unqualified-id: [C++ 5.1]
+///                   identifier
+///                   operator-function-id
+///                   conversion-function-id
+///                   '~' class-name
+///                   template-id
+///
+///       new-expression: [C++ 5.3.4]
+///                   '::'[opt] 'new' new-placement[opt] new-type-id
+///                                     new-initializer[opt]
+///                   '::'[opt] 'new' new-placement[opt] '(' type-id ')'
+///                                     new-initializer[opt]
+///
+///       delete-expression: [C++ 5.3.5]
+///                   '::'[opt] 'delete' cast-expression
+///                   '::'[opt] 'delete' '[' ']' cast-expression
+///
+/// [GNU/Embarcadero] unary-type-trait:
+///                   '__is_arithmetic'
+///                   '__is_floating_point'
+///                   '__is_integral'
+///                   '__is_lvalue_expr'
+///                   '__is_rvalue_expr'
+///                   '__is_complete_type'
+///                   '__is_void'
+///                   '__is_array'
+///                   '__is_function'
+///                   '__is_reference'
+///                   '__is_lvalue_reference'
+///                   '__is_rvalue_reference'
+///                   '__is_fundamental'
+///                   '__is_object'
+///                   '__is_scalar'
+///                   '__is_compound'
+///                   '__is_pointer'
+///                   '__is_member_object_pointer'
+///                   '__is_member_function_pointer'
+///                   '__is_member_pointer'
+///                   '__is_const'
+///                   '__is_volatile'
+///                   '__is_trivial'
+///                   '__is_standard_layout'
+///                   '__is_signed'
+///                   '__is_unsigned'
+///
+/// [GNU] unary-type-trait:
+///                   '__has_nothrow_assign'
+///                   '__has_nothrow_copy'
+///                   '__has_nothrow_constructor'
+///                   '__has_trivial_assign'                  [TODO]
+///                   '__has_trivial_copy'                    [TODO]
+///                   '__has_trivial_constructor'
+///                   '__has_trivial_destructor'
+///                   '__has_virtual_destructor'
+///                   '__is_abstract'                         [TODO]
+///                   '__is_class'
+///                   '__is_empty'                            [TODO]
+///                   '__is_enum'
+///                   '__is_final'
+///                   '__is_pod'
+///                   '__is_polymorphic'
+///                   '__is_sealed'                           [MS]
+///                   '__is_trivial'
+///                   '__is_union'
+///                   '__has_unique_object_representations'
+///
+/// [Clang] unary-type-trait:
+///                   '__is_aggregate'
+///                   '__trivially_copyable'
+///
+///       binary-type-trait:
+/// [GNU]             '__is_base_of'
+/// [MS]              '__is_convertible_to'
+///                   '__is_convertible'
+///                   '__is_same'
+///
+/// [Embarcadero] array-type-trait:
+///                   '__array_rank'
+///                   '__array_extent'
+///
+/// [Embarcadero] expression-trait:
+///                   '__is_lvalue_expr'
+///                   '__is_rvalue_expr'
+/// \endverbatim
+///
+ExprResult Parser::ParseCastExpression(CastParseKind ParseKind,
+bool isAddressOfOperand,
+bool &NotCastExpr,
+TypeCastState isTypeCast,
+bool isVectorLiteral,
+bool *NotPrimaryExpression) {
+ExprResult Res;
+tok::TokenKind SavedKind = Tok.getKind();
+auto SavedType = PreferredType;
+NotCastExpr = false;
+// This handles all of cast-expression, unary-expression, postfix-expression,
+// and primary-expression.  We handle them together like this for efficiency
+// and to simplify handling of an expression starting with a '(' token: which
+// may be one of a parenthesized expression, cast-expression, compound literal
+// expression, or statement expression.
+//
+// If the parsed tokens consist of a primary-expression, the cases below
+// break out of the switch;  at the end we call ParsePostfixExpressionSuffix
+// to handle the postfix expression suffixes.  Cases that cannot be followed
+// by postfix exprs should return without invoking
+// ParsePostfixExpressionSuffix.
+switch (SavedKind) {
+case tok::l_paren: {
+// If this expression is limited to being a unary-expression, the paren can
+// not start a cast expression.
+ParenParseOption ParenExprType;
+switch (ParseKind) {
+case CastParseKind::UnaryExprOnly:
+if (!getLangOpts().CPlusPlus)
+ParenExprType = CompoundLiteral;
+LLVM_FALLTHROUGH;
+case CastParseKind::AnyCastExpr:
+ParenExprType = ParenParseOption::CastExpr;
+break;
+case CastParseKind::PrimaryExprOnly:
+ParenExprType = FoldExpr;
+break;
+}
+ParsedType CastTy;
+SourceLocation RParenLoc;
+Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
+isTypeCast == IsTypeCast, CastTy, RParenLoc);
+if (isVectorLiteral)
+return Res;
+switch (ParenExprType) {
+case SimpleExpr:   break;    // Nothing else to do.
+case CompoundStmt: break;  // Nothing else to do.
+case CompoundLiteral:
+// We parsed '(' type-name ')' '{' ... '}'.  If any suffixes of
+// postfix-expression exist, parse them now.
+break;
+case CastExpr:
+// We have parsed the cast-expression and no postfix-expr pieces are
+// following.
+return Res;
+case FoldExpr:
+// We only parsed a fold-expression. There might be postfix-expr pieces
+// afterwards; parse them now.
+break;
+}
+break;
+}
+// primary-expression
+case tok::numeric_constant:
+// constant: integer-constant
+// constant: floating-constant
+Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
+ConsumeToken();
+break;
+case tok::kw_true:
+case tok::kw_false:
+Res = ParseCXXBoolLiteral();
+break;
+case tok::kw___objc_yes:
+case tok::kw___objc_no:
+return ParseObjCBoolLiteral();
+case tok::kw_nullptr:
+Diag(Tok, diag::warn_cxx98_compat_nullptr);
+return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
+case tok::annot_primary_expr:
+Res = getExprAnnotation(Tok);
+ConsumeAnnotationToken();
+if (!Res.isInvalid() && Tok.is(tok::less))
+checkPotentialAngleBracket(Res);
+break;
+case tok::annot_non_type:
+case tok::annot_non_type_dependent:
+case tok::annot_non_type_undeclared: {
+CXXScopeSpec SS;
+Token Replacement;
+Res = tryParseCXXIdExpression(SS, isAddressOfOperand, Replacement);
+assert(!Res.isUnset() &&
+"should not perform typo correction on annotation token");
+break;
+}
+case tok::kw___super:
+case tok::kw_decltype:
+// Annotate the token and tail recurse.
+if (TryAnnotateTypeOrScopeToken())
+return ExprError();
+assert(Tok.isNot(tok::kw_decltype) && Tok.isNot(tok::kw___super));
+return ParseCastExpression(ParseKind, isAddressOfOperand, isTypeCast,
+isVectorLiteral, NotPrimaryExpression);
+case tok::identifier: {      // primary-expression: identifier
+// unqualified-id: identifier
+// constant: enumeration-constant
+// Turn a potentially qualified name into a annot_typename or
+// annot_cxxscope if it would be valid.  This handles things like x::y, etc.
+if (getLangOpts().CPlusPlus) {
+// Avoid the unnecessary parse-time lookup in the common case
+// where the syntax forbids a type.
+const Token &Next = NextToken();
+// If this identifier was reverted from a token ID, and the next token
+// is a parenthesis, this is likely to be a use of a type trait. Check
+// those tokens.
+if (Next.is(tok::l_paren) &&
+Tok.is(tok::identifier) &&
+Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
+IdentifierInfo *II = Tok.getIdentifierInfo();
+// Build up the mapping of revertible type traits, for future use.
+if (RevertibleTypeTraits.empty()) {
+#define RTT_JOIN(X,Y) X##Y
+#define REVERTIBLE_TYPE_TRAIT(Name)                         \
+RevertibleTypeTraits[PP.getIdentifierInfo(#Name)] \
+= RTT_JOIN(tok::kw_,Name)
+REVERTIBLE_TYPE_TRAIT(__is_abstract);
+REVERTIBLE_TYPE_TRAIT(__is_aggregate);
+REVERTIBLE_TYPE_TRAIT(__is_arithmetic);
+REVERTIBLE_TYPE_TRAIT(__is_array);
+REVERTIBLE_TYPE_TRAIT(__is_assignable);
+REVERTIBLE_TYPE_TRAIT(__is_base_of);
+REVERTIBLE_TYPE_TRAIT(__is_class);
+REVERTIBLE_TYPE_TRAIT(__is_complete_type);
+REVERTIBLE_TYPE_TRAIT(__is_compound);
+REVERTIBLE_TYPE_TRAIT(__is_const);
+REVERTIBLE_TYPE_TRAIT(__is_constructible);
+REVERTIBLE_TYPE_TRAIT(__is_convertible);
+REVERTIBLE_TYPE_TRAIT(__is_convertible_to);
+REVERTIBLE_TYPE_TRAIT(__is_destructible);
+REVERTIBLE_TYPE_TRAIT(__is_empty);
+REVERTIBLE_TYPE_TRAIT(__is_enum);
+REVERTIBLE_TYPE_TRAIT(__is_floating_point);
+REVERTIBLE_TYPE_TRAIT(__is_final);
+REVERTIBLE_TYPE_TRAIT(__is_function);
+REVERTIBLE_TYPE_TRAIT(__is_fundamental);
+REVERTIBLE_TYPE_TRAIT(__is_integral);
+REVERTIBLE_TYPE_TRAIT(__is_interface_class);
+REVERTIBLE_TYPE_TRAIT(__is_literal);
+REVERTIBLE_TYPE_TRAIT(__is_lvalue_expr);
+REVERTIBLE_TYPE_TRAIT(__is_lvalue_reference);
+REVERTIBLE_TYPE_TRAIT(__is_member_function_pointer);
+REVERTIBLE_TYPE_TRAIT(__is_member_object_pointer);
+REVERTIBLE_TYPE_TRAIT(__is_member_pointer);
+REVERTIBLE_TYPE_TRAIT(__is_nothrow_assignable);
+REVERTIBLE_TYPE_TRAIT(__is_nothrow_constructible);
+REVERTIBLE_TYPE_TRAIT(__is_nothrow_destructible);
+REVERTIBLE_TYPE_TRAIT(__is_object);
+REVERTIBLE_TYPE_TRAIT(__is_pod);
+REVERTIBLE_TYPE_TRAIT(__is_pointer);
+REVERTIBLE_TYPE_TRAIT(__is_polymorphic);
+REVERTIBLE_TYPE_TRAIT(__is_reference);
+REVERTIBLE_TYPE_TRAIT(__is_rvalue_expr);
+REVERTIBLE_TYPE_TRAIT(__is_rvalue_reference);
+REVERTIBLE_TYPE_TRAIT(__is_same);
+REVERTIBLE_TYPE_TRAIT(__is_scalar);
+REVERTIBLE_TYPE_TRAIT(__is_sealed);
+REVERTIBLE_TYPE_TRAIT(__is_signed);
+REVERTIBLE_TYPE_TRAIT(__is_standard_layout);
+REVERTIBLE_TYPE_TRAIT(__is_trivial);
+REVERTIBLE_TYPE_TRAIT(__is_trivially_assignable);
+REVERTIBLE_TYPE_TRAIT(__is_trivially_constructible);
+REVERTIBLE_TYPE_TRAIT(__is_trivially_copyable);
+REVERTIBLE_TYPE_TRAIT(__is_union);
+REVERTIBLE_TYPE_TRAIT(__is_unsigned);
+REVERTIBLE_TYPE_TRAIT(__is_void);
+REVERTIBLE_TYPE_TRAIT(__is_volatile);
+#undef REVERTIBLE_TYPE_TRAIT
+#undef RTT_JOIN
+}
+// If we find that this is in fact the name of a type trait,
+// update the token kind in place and parse again to treat it as
+// the appropriate kind of type trait.
+llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
+= RevertibleTypeTraits.find(II);
+if (Known != RevertibleTypeTraits.end()) {
+Tok.setKind(Known->second);
+return ParseCastExpression(ParseKind, isAddressOfOperand,
+NotCastExpr, isTypeCast,
+isVectorLiteral, NotPrimaryExpression);
+}
+}
+if ((!ColonIsSacred && Next.is(tok::colon)) ||
+Next.isOneOf(tok::coloncolon, tok::less, tok::l_paren,
+tok::l_brace)) {
+// If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
+if (TryAnnotateTypeOrScopeToken())
+return ExprError();
+if (!Tok.is(tok::identifier))
+return ParseCastExpression(ParseKind, isAddressOfOperand,
+NotCastExpr, isTypeCast,
+isVectorLiteral,
+NotPrimaryExpression);
+}
+}
+// Consume the identifier so that we can see if it is followed by a '(' or
+// '.'.
+IdentifierInfo &II = *Tok.getIdentifierInfo();
+SourceLocation ILoc = ConsumeToken();
+// Support 'Class.property' and 'super.property' notation.
+if (getLangOpts().ObjC && Tok.is(tok::period) &&
+(Actions.getTypeName(II, ILoc, getCurScope()) ||
+// Allow the base to be 'super' if in an objc-method.
+(&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
+ConsumeToken();
+if (Tok.is(tok::code_completion) && &II != Ident_super) {
+Actions.CodeCompleteObjCClassPropertyRefExpr(
+getCurScope(), II, ILoc, ExprStatementTokLoc == ILoc);
+cutOffParsing();
+return ExprError();
+}
+// Allow either an identifier or the keyword 'class' (in C++).
+if (Tok.isNot(tok::identifier) &&
+!(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
+Diag(Tok, diag::err_expected_property_name);
+return ExprError();
+}
+IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
+SourceLocation PropertyLoc = ConsumeToken();
+Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
+ILoc, PropertyLoc);
+break;
+}
+// In an Objective-C method, if we have "super" followed by an identifier,
+// the token sequence is ill-formed. However, if there's a ':' or ']' after
+// that identifier, this is probably a message send with a missing open
+// bracket. Treat it as such.
+if (getLangOpts().ObjC && &II == Ident_super && !InMessageExpression &&
+getCurScope()->isInObjcMethodScope() &&
+((Tok.is(tok::identifier) &&
+(NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
+Tok.is(tok::code_completion))) {
+Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, nullptr,
+nullptr);
+break;
+}
+// If we have an Objective-C class name followed by an identifier
+// and either ':' or ']', this is an Objective-C class message
+// send that's missing the opening '['. Recovery
+// appropriately. Also take this path if we're performing code
+// completion after an Objective-C class name.
+if (getLangOpts().ObjC &&
+((Tok.is(tok::identifier) && !InMessageExpression) ||
+Tok.is(tok::code_completion))) {
+const Token& Next = NextToken();
+if (Tok.is(tok::code_completion) ||
+Next.is(tok::colon) || Next.is(tok::r_square))
+if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
+if (Typ.get()->isObjCObjectOrInterfaceType()) {
+// Fake up a Declarator to use with ActOnTypeName.
+DeclSpec DS(AttrFactory);
+DS.SetRangeStart(ILoc);
+DS.SetRangeEnd(ILoc);
+const char *PrevSpec = nullptr;
+unsigned DiagID;
+DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ,
+Actions.getASTContext().getPrintingPolicy());
+Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
+TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
+DeclaratorInfo);
+if (Ty.isInvalid())
+break;
+Res = ParseObjCMessageExpressionBody(SourceLocation(),
+SourceLocation(),
+Ty.get(), nullptr);
+break;
+}
+}
+// Make sure to pass down the right value for isAddressOfOperand.
+if (isAddressOfOperand && isPostfixExpressionSuffixStart())
+isAddressOfOperand = false;
+// Function designators are allowed to be undeclared (C99 6.5.1p2), so we
+// need to know whether or not this identifier is a function designator or
+// not.
+UnqualifiedId Name;
+CXXScopeSpec ScopeSpec;
+SourceLocation TemplateKWLoc;
+Token Replacement;
+CastExpressionIdValidator Validator(
+/*Next=*/Tok,
+/*AllowTypes=*/isTypeCast != NotTypeCast,
+/*AllowNonTypes=*/isTypeCast != IsTypeCast);
+Validator.IsAddressOfOperand = isAddressOfOperand;
+if (Tok.isOneOf(tok::periodstar, tok::arrowstar)) {
+Validator.WantExpressionKeywords = false;
+Validator.WantRemainingKeywords = false;
+} else {
+Validator.WantRemainingKeywords = Tok.isNot(tok::r_paren);
+}
+Name.setIdentifier(&II, ILoc);
+Res = Actions.ActOnIdExpression(
+getCurScope(), ScopeSpec, TemplateKWLoc, Name, Tok.is(tok::l_paren),
+isAddressOfOperand, &Validator,
+/*IsInlineAsmIdentifier=*/false,
+Tok.is(tok::r_paren) ? nullptr : &Replacement);
+if (!Res.isInvalid() && Res.isUnset()) {
+UnconsumeToken(Replacement);
+return ParseCastExpression(ParseKind, isAddressOfOperand,
+NotCastExpr, isTypeCast,
+/*isVectorLiteral=*/false,
+NotPrimaryExpression);
+}
+if (!Res.isInvalid() && Tok.is(tok::less))
+checkPotentialAngleBracket(Res);
+break;
+}
+case tok::char_constant:     // constant: character-constant
+case tok::wide_char_constant:
+case tok::utf8_char_constant:
+case tok::utf16_char_constant:
+case tok::utf32_char_constant:
+Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
+ConsumeToken();
+break;
+case tok::kw___func__:       // primary-expression: __func__ [C99 6.4.2.2]
+case tok::kw___FUNCTION__:   // primary-expression: __FUNCTION__ [GNU]
+case tok::kw___FUNCDNAME__:   // primary-expression: __FUNCDNAME__ [MS]
+case tok::kw___FUNCSIG__:     // primary-expression: __FUNCSIG__ [MS]
+case tok::kw_L__FUNCTION__:   // primary-expression: L__FUNCTION__ [MS]
+case tok::kw_L__FUNCSIG__:    // primary-expression: L__FUNCSIG__ [MS]
+case tok::kw___PRETTY_FUNCTION__:  // primary-expression: __P..Y_F..N__ [GNU]
+Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
+ConsumeToken();
+break;
+case tok::string_literal:    // primary-expression: string-literal
+case tok::wide_string_literal:
+case tok::utf8_string_literal:
+case tok::utf16_string_literal:
+case tok::utf32_string_literal:
+Res = ParseStringLiteralExpression(true);
+break;
+case tok::kw__Generic:   // primary-expression: generic-selection [C11 6.5.1]
+Res = ParseGenericSelectionExpression();
+break;
+case tok::kw___builtin_available:
+return ParseAvailabilityCheckExpr(Tok.getLocation());
+case tok::kw___builtin_va_arg:
+case tok::kw___builtin_offsetof:
+case tok::kw___builtin_choose_expr:
+case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
+case tok::kw___builtin_convertvector:
+case tok::kw___builtin_COLUMN:
+case tok::kw___builtin_FILE:
+case tok::kw___builtin_FUNCTION:
+case tok::kw___builtin_LINE:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseBuiltinPrimaryExpression();
+case tok::kw___null:
+return Actions.ActOnGNUNullExpr(ConsumeToken());
+case tok::plusplus:      // unary-expression: '++' unary-expression [C99]
+case tok::minusminus: {  // unary-expression: '--' unary-expression [C99]
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+// C++ [expr.unary] has:
+//   unary-expression:
+//     ++ cast-expression
+//     -- cast-expression
+Token SavedTok = Tok;
+ConsumeToken();
+PreferredType.enterUnary(Actions, Tok.getLocation(), SavedTok.getKind(),
+SavedTok.getLocation());
+// One special case is implicitly handled here: if the preceding tokens are
+// an ambiguous cast expression, such as "(T())++", then we recurse to
+// determine whether the '++' is prefix or postfix.
+Res = ParseCastExpression(getLangOpts().CPlusPlus ?
+UnaryExprOnly : AnyCastExpr,
+/*isAddressOfOperand*/false, NotCastExpr,
+NotTypeCast);
+if (NotCastExpr) {
+// If we return with NotCastExpr = true, we must not consume any tokens,
+// so put the token back where we found it.
+assert(Res.isInvalid());
+UnconsumeToken(SavedTok);
+return ExprError();
+}
+if (!Res.isInvalid())
+Res = Actions.ActOnUnaryOp(getCurScope(), SavedTok.getLocation(),
+SavedKind, Res.get());
+return Res;
+}
+case tok::amp: {         // unary-expression: '&' cast-expression
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+// Special treatment because of member pointers
+SourceLocation SavedLoc = ConsumeToken();
+PreferredType.enterUnary(Actions, Tok.getLocation(), tok::amp, SavedLoc);
+Res = ParseCastExpression(AnyCastExpr, true);
+if (!Res.isInvalid())
+Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
+return Res;
+}
+case tok::star:          // unary-expression: '*' cast-expression
+case tok::plus:          // unary-expression: '+' cast-expression
+case tok::minus:         // unary-expression: '-' cast-expression
+case tok::tilde:         // unary-expression: '~' cast-expression
+case tok::exclaim:       // unary-expression: '!' cast-expression
+case tok::kw___real:     // unary-expression: '__real' cast-expression [GNU]
+case tok::kw___imag: {   // unary-expression: '__imag' cast-expression [GNU]
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+SourceLocation SavedLoc = ConsumeToken();
+PreferredType.enterUnary(Actions, Tok.getLocation(), SavedKind, SavedLoc);
+Res = ParseCastExpression(AnyCastExpr);
+if (!Res.isInvalid())
+Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
+return Res;
+}
+case tok::kw_co_await: {  // unary-expression: 'co_await' cast-expression
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+SourceLocation CoawaitLoc = ConsumeToken();
+Res = ParseCastExpression(AnyCastExpr);
+if (!Res.isInvalid())
+Res = Actions.ActOnCoawaitExpr(getCurScope(), CoawaitLoc, Res.get());
+return Res;
+}
+case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
+// __extension__ silences extension warnings in the subexpression.
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+ExtensionRAIIObject O(Diags);  // Use RAII to do this.
+SourceLocation SavedLoc = ConsumeToken();
+Res = ParseCastExpression(AnyCastExpr);
+if (!Res.isInvalid())
+Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
+return Res;
+}
+case tok::kw__Alignof:   // unary-expression: '_Alignof' '(' type-name ')'
+if (!getLangOpts().C11)
+Diag(Tok, diag::ext_c11_feature) << Tok.getName();
+LLVM_FALLTHROUGH;
+case tok::kw_alignof:    // unary-expression: 'alignof' '(' type-id ')'
+case tok::kw___alignof:  // unary-expression: '__alignof' unary-expression
+// unary-expression: '__alignof' '(' type-name ')'
+case tok::kw_sizeof:     // unary-expression: 'sizeof' unary-expression
+// unary-expression: 'sizeof' '(' type-name ')'
+case tok::kw_vec_step:   // unary-expression: OpenCL 'vec_step' expression
+// unary-expression: '__builtin_omp_required_simd_align' '(' type-name ')'
+case tok::kw___builtin_omp_required_simd_align:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseUnaryExprOrTypeTraitExpression();
+case tok::ampamp: {      // unary-expression: '&&' identifier
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+SourceLocation AmpAmpLoc = ConsumeToken();
+if (Tok.isNot(tok::identifier))
+return ExprError(Diag(Tok, diag::err_expected) << tok::identifier);
+if (getCurScope()->getFnParent() == nullptr)
+return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
+Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
+LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
+Tok.getLocation());
+Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
+ConsumeToken();
+return Res;
+}
+case tok::kw_const_cast:
+case tok::kw_dynamic_cast:
+case tok::kw_reinterpret_cast:
+case tok::kw_static_cast:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+Res = ParseCXXCasts();
+break;
+case tok::kw___builtin_bit_cast:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+Res = ParseBuiltinBitCast();
+break;
+case tok::kw_typeid:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+Res = ParseCXXTypeid();
+break;
+case tok::kw___uuidof:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+Res = ParseCXXUuidof();
+break;
+case tok::kw_this:
+Res = ParseCXXThis();
+break;
+case tok::annot_typename:
+if (isStartOfObjCClassMessageMissingOpenBracket()) {
+ParsedType Type = getTypeAnnotation(Tok);
+// Fake up a Declarator to use with ActOnTypeName.
+DeclSpec DS(AttrFactory);
+DS.SetRangeStart(Tok.getLocation());
+DS.SetRangeEnd(Tok.getLastLoc());
+const char *PrevSpec = nullptr;
+unsigned DiagID;
+DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
+PrevSpec, DiagID, Type,
+Actions.getASTContext().getPrintingPolicy());
+Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
+TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
+if (Ty.isInvalid())
+break;
+ConsumeAnnotationToken();
+Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
+Ty.get(), nullptr);
+break;
+}
+LLVM_FALLTHROUGH;
+case tok::annot_decltype:
+case tok::kw_char:
+case tok::kw_wchar_t:
+case tok::kw_char8_t:
+case tok::kw_char16_t:
+case tok::kw_char32_t:
+case tok::kw_bool:
+case tok::kw_short:
+case tok::kw_int:
+case tok::kw_long:
+case tok::kw___int64:
+case tok::kw___int128:
+case tok::kw_signed:
+case tok::kw_unsigned:
+case tok::kw_half:
+case tok::kw_float:
+case tok::kw_double:
+case tok::kw__Float16:
+case tok::kw___float128:
+case tok::kw_void:
+case tok::kw_typename:
+case tok::kw_typeof:
+case tok::kw___vector:
+#define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
+#include "clang/Basic/OpenCLImageTypes.def"
+{
+if (!getLangOpts().CPlusPlus) {
+Diag(Tok, diag::err_expected_expression);
+return ExprError();
+}
+// Everything henceforth is a postfix-expression.
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+if (SavedKind == tok::kw_typename) {
+// postfix-expression: typename-specifier '(' expression-list[opt] ')'
+//                     typename-specifier braced-init-list
+if (TryAnnotateTypeOrScopeToken())
+return ExprError();
+if (!Actions.isSimpleTypeSpecifier(Tok.getKind()))
+// We are trying to parse a simple-type-specifier but might not get such
+// a token after error recovery.
+return ExprError();
+}
+// postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
+//                     simple-type-specifier braced-init-list
+//
+DeclSpec DS(AttrFactory);
+ParseCXXSimpleTypeSpecifier(DS);
+if (Tok.isNot(tok::l_paren) &&
+(!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
+return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
+<< DS.getSourceRange());
+if (Tok.is(tok::l_brace))
+Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
+Res = ParseCXXTypeConstructExpression(DS);
+break;
+}
+case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
+// If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
+// (We can end up in this situation after tentative parsing.)
+if (TryAnnotateTypeOrScopeToken())
+return ExprError();
+if (!Tok.is(tok::annot_cxxscope))
+return ParseCastExpression(ParseKind, isAddressOfOperand, NotCastExpr,
+isTypeCast, isVectorLiteral,
+NotPrimaryExpression);
+Token Next = NextToken();
+if (Next.is(tok::annot_template_id)) {
+TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
+if (TemplateId->Kind == TNK_Type_template) {
+// We have a qualified template-id that we know refers to a
+// type, translate it into a type and continue parsing as a
+// cast expression.
+CXXScopeSpec SS;
+ParseOptionalCXXScopeSpecifier(SS, nullptr,
+/*EnteringContext=*/false);
+AnnotateTemplateIdTokenAsType(SS);
+return ParseCastExpression(ParseKind, isAddressOfOperand, NotCastExpr,
+isTypeCast, isVectorLiteral,
+NotPrimaryExpression);
+}
+}
+// Parse as an id-expression.
+Res = ParseCXXIdExpression(isAddressOfOperand);
+break;
+}
+case tok::annot_template_id: { // [C++]          template-id
+TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
+if (TemplateId->Kind == TNK_Type_template) {
+// We have a template-id that we know refers to a type,
+// translate it into a type and continue parsing as a cast
+// expression.
+CXXScopeSpec SS;
+AnnotateTemplateIdTokenAsType(SS);
+return ParseCastExpression(ParseKind, isAddressOfOperand,
+NotCastExpr, isTypeCast, isVectorLiteral,
+NotPrimaryExpression);
+}
+// Fall through to treat the template-id as an id-expression.
+LLVM_FALLTHROUGH;
+}
+case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
+Res = ParseCXXIdExpression(isAddressOfOperand);
+break;
+case tok::coloncolon: {
+// ::foo::bar -> global qualified name etc.   If TryAnnotateTypeOrScopeToken
+// annotates the token, tail recurse.
+if (TryAnnotateTypeOrScopeToken())
+return ExprError();
+if (!Tok.is(tok::coloncolon))
+return ParseCastExpression(ParseKind, isAddressOfOperand, isTypeCast,
+isVectorLiteral, NotPrimaryExpression);
+// ::new -> [C++] new-expression
+// ::delete -> [C++] delete-expression
+SourceLocation CCLoc = ConsumeToken();
+if (Tok.is(tok::kw_new)) {
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseCXXNewExpression(true, CCLoc);
+}
+if (Tok.is(tok::kw_delete)) {
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseCXXDeleteExpression(true, CCLoc);
+}
+// This is not a type name or scope specifier, it is an invalid expression.
+Diag(CCLoc, diag::err_expected_expression);
+return ExprError();
+}
+case tok::kw_new: // [C++] new-expression
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseCXXNewExpression(false, Tok.getLocation());
+case tok::kw_delete: // [C++] delete-expression
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseCXXDeleteExpression(false, Tok.getLocation());
+case tok::kw_requires: // [C++2a] requires-expression
+return ParseRequiresExpression();
+case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
+SourceLocation KeyLoc = ConsumeToken();
+BalancedDelimiterTracker T(*this, tok::l_paren);
+if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
+return ExprError();
+// C++11 [expr.unary.noexcept]p1:
+//   The noexcept operator determines whether the evaluation of its operand,
+//   which is an unevaluated operand, can throw an exception.
+EnterExpressionEvaluationContext Unevaluated(
+Actions, Sema::ExpressionEvaluationContext::Unevaluated);
+ExprResult Result = ParseExpression();
+T.consumeClose();
+if (!Result.isInvalid())
+Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
+Result.get(), T.getCloseLocation());
+return Result;
+}
+#define TYPE_TRAIT(N,Spelling,K) \
+case tok::kw_##Spelling:
+#include "clang/Basic/TokenKinds.def"
+return ParseTypeTrait();
+case tok::kw___array_rank:
+case tok::kw___array_extent:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseArrayTypeTrait();
+case tok::kw___is_lvalue_expr:
+case tok::kw___is_rvalue_expr:
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+return ParseExpressionTrait();
+case tok::at: {
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+SourceLocation AtLoc = ConsumeToken();
+return ParseObjCAtExpression(AtLoc);
+}
+case tok::caret:
+Res = ParseBlockLiteralExpression();
+break;
+case tok::code_completion: {
+Actions.CodeCompleteExpression(getCurScope(),
+PreferredType.get(Tok.getLocation()));
+cutOffParsing();
+return ExprError();
+}
+case tok::l_square:
+if (getLangOpts().CPlusPlus11) {
+if (getLangOpts().ObjC) {
+// C++11 lambda expressions and Objective-C message sends both start with a
+// square bracket.  There are three possibilities here:
+// we have a valid lambda expression, we have an invalid lambda
+// expression, or we have something that doesn't appear to be a lambda.
+// If we're in the last case, we fall back to ParseObjCMessageExpression.
+Res = TryParseLambdaExpression();
+if (!Res.isInvalid() && !Res.get()) {
+// We assume Objective-C++ message expressions are not
+// primary-expressions.
+if (NotPrimaryExpression)
+*NotPrimaryExpression = true;
+Res = ParseObjCMessageExpression();
+}
+break;
+}
+Res = ParseLambdaExpression();
+break;
+}
+if (getLangOpts().ObjC) {
+Res = ParseObjCMessageExpression();
+break;
+}
+LLVM_FALLTHROUGH;
+default:
+NotCastExpr = true;
+return ExprError();
+}
+// Check to see whether Res is a function designator only. If it is and we
+// are compiling for OpenCL, we need to return an error as this implies
+// that the address of the function is being taken, which is illegal in CL.
+if (ParseKind == PrimaryExprOnly)
+// This is strictly a primary-expression - no postfix-expr pieces should be
+// parsed.
+return Res;
+// These can be followed by postfix-expr pieces.
+PreferredType = SavedType;
+Res = ParsePostfixExpressionSuffix(Res);
+if (getLangOpts().OpenCL)
+if (Expr *PostfixExpr = Res.get()) {
+QualType Ty = PostfixExpr->getType();
+if (!Ty.isNull() && Ty->isFunctionType()) {
+Diag(PostfixExpr->getExprLoc(),
+diag::err_opencl_taking_function_address_parser);
+return ExprError();
+}
+}
+return Res;
+}
+/// Once the leading part of a postfix-expression is parsed, this
+/// method parses any suffixes that apply.
+///
+/// \verbatim
+///       postfix-expression: [C99 6.5.2]
+///         primary-expression
+///         postfix-expression '[' expression ']'
+///         postfix-expression '[' braced-init-list ']'
+///         postfix-expression '(' argument-expression-list[opt] ')'
+///         postfix-expression '.' identifier
+///         postfix-expression '->' identifier
+///         postfix-expression '++'
+///         postfix-expression '--'
+///         '(' type-name ')' '{' initializer-list '}'
+///         '(' type-name ')' '{' initializer-list ',' '}'
+///
+///       argument-expression-list: [C99 6.5.2]
+///         argument-expression ...[opt]
+///         argument-expression-list ',' assignment-expression ...[opt]
+/// \endverbatim
+ExprResult
+Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
+// Now that the primary-expression piece of the postfix-expression has been
+// parsed, see if there are any postfix-expression pieces here.
+SourceLocation Loc;
+auto SavedType = PreferredType;
+while (1) {
+// Each iteration relies on preferred type for the whole expression.
+PreferredType = SavedType;
+switch (Tok.getKind()) {
+case tok::code_completion:
+if (InMessageExpression)
+return LHS;
+Actions.CodeCompletePostfixExpression(
+getCurScope(), LHS, PreferredType.get(Tok.getLocation()));
+cutOffParsing();
+return ExprError();
+case tok::identifier:
+// If we see identifier: after an expression, and we're not already in a
+// message send, then this is probably a message send with a missing
+// opening bracket '['.
+if (getLangOpts().ObjC && !InMessageExpression &&
+(NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
+LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
+nullptr, LHS.get());
+break;
+}
+// Fall through; this isn't a message send.
+LLVM_FALLTHROUGH;
+default:  // Not a postfix-expression suffix.
+return LHS;
+case tok::l_square: {  // postfix-expression: p-e '[' expression ']'
+// If we have a array postfix expression that starts on a new line and
+// Objective-C is enabled, it is highly likely that the user forgot a
+// semicolon after the base expression and that the array postfix-expr is
+// actually another message send.  In this case, do some look-ahead to see
+// if the contents of the square brackets are obviously not a valid
+// expression and recover by pretending there is no suffix.
+if (getLangOpts().ObjC && Tok.isAtStartOfLine() &&
+isSimpleObjCMessageExpression())
+return LHS;
+// Reject array indices starting with a lambda-expression. '[[' is
+// reserved for attributes.
+if (CheckProhibitedCXX11Attribute()) {
+(void)Actions.CorrectDelayedTyposInExpr(LHS);
+return ExprError();
+}
+BalancedDelimiterTracker T(*this, tok::l_square);
+T.consumeOpen();
+Loc = T.getOpenLocation();
+ExprResult Idx, Length;
+SourceLocation ColonLoc;
+PreferredType.enterSubscript(Actions, Tok.getLocation(), LHS.get());
+if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
+Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
+Idx = ParseBraceInitializer();
+} else if (getLangOpts().OpenMP) {
+ColonProtectionRAIIObject RAII(*this);
+// Parse [: or [ expr or [ expr :
+if (!Tok.is(tok::colon)) {
+// [ expr
+Idx = ParseExpression();
+}
+if (Tok.is(tok::colon)) {
+// Consume ':'
+ColonLoc = ConsumeToken();
+if (Tok.isNot(tok::r_square))
+Length = ParseExpression();
+}
+} else
+Idx = ParseExpression();
+SourceLocation RLoc = Tok.getLocation();
+LHS = Actions.CorrectDelayedTyposInExpr(LHS);
+Idx = Actions.CorrectDelayedTyposInExpr(Idx);
+Length = Actions.CorrectDelayedTyposInExpr(Length);
+if (!LHS.isInvalid() && !Idx.isInvalid() && !Length.isInvalid() &&
+Tok.is(tok::r_square)) {
+if (ColonLoc.isValid()) {
+LHS = Actions.ActOnOMPArraySectionExpr(LHS.get(), Loc, Idx.get(),
+ColonLoc, Length.get(), RLoc);
+} else {
+LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.get(), Loc,
+Idx.get(), RLoc);
+}
+} else {
+LHS = ExprError();
+Idx = ExprError();
+}
+// Match the ']'.
+T.consumeClose();
+break;
+}
+case tok::l_paren:         // p-e: p-e '(' argument-expression-list[opt] ')'
+case tok::lesslessless: {  // p-e: p-e '<<<' argument-expression-list '>>>'
+//   '(' argument-expression-list[opt] ')'
+tok::TokenKind OpKind = Tok.getKind();
+InMessageExpressionRAIIObject InMessage(*this, false);
+Expr *ExecConfig = nullptr;
+BalancedDelimiterTracker PT(*this, tok::l_paren);
+if (OpKind == tok::lesslessless) {
+ExprVector ExecConfigExprs;
+CommaLocsTy ExecConfigCommaLocs;
+SourceLocation OpenLoc = ConsumeToken();
+if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
+(void)Actions.CorrectDelayedTyposInExpr(LHS);
+LHS = ExprError();
+}
+SourceLocation CloseLoc;
+if (TryConsumeToken(tok::greatergreatergreater, CloseLoc)) {
+} else if (LHS.isInvalid()) {
+SkipUntil(tok::greatergreatergreater, StopAtSemi);
+} else {
+// There was an error closing the brackets
+Diag(Tok, diag::err_expected) << tok::greatergreatergreater;
+Diag(OpenLoc, diag::note_matching) << tok::lesslessless;
+SkipUntil(tok::greatergreatergreater, StopAtSemi);
+LHS = ExprError();
+}
+if (!LHS.isInvalid()) {
+if (ExpectAndConsume(tok::l_paren))
+LHS = ExprError();
+else
+Loc = PrevTokLocation;
+}
+if (!LHS.isInvalid()) {
+ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
+OpenLoc,
+ExecConfigExprs,
+CloseLoc);
+if (ECResult.isInvalid())
+LHS = ExprError();
+else
+ExecConfig = ECResult.get();
+}
+} else {
+PT.consumeOpen();
+Loc = PT.getOpenLocation();
+}
+ExprVector ArgExprs;
+CommaLocsTy CommaLocs;
+auto RunSignatureHelp = [&]() -> QualType {
+QualType PreferredType = Actions.ProduceCallSignatureHelp(
+getCurScope(), LHS.get(), ArgExprs, PT.getOpenLocation());
+CalledSignatureHelp = true;
+return PreferredType;
+};
+if (OpKind == tok::l_paren || !LHS.isInvalid()) {
+if (Tok.isNot(tok::r_paren)) {
+if (ParseExpressionList(ArgExprs, CommaLocs, [&] {
+PreferredType.enterFunctionArgument(Tok.getLocation(),
+RunSignatureHelp);
+})) {
+(void)Actions.CorrectDelayedTyposInExpr(LHS);
+// If we got an error when parsing expression list, we don't call
+// the CodeCompleteCall handler inside the parser. So call it here
+// to make sure we get overload suggestions even when we are in the
+// middle of a parameter.
+if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
+RunSignatureHelp();
+LHS = ExprError();
+} else if (LHS.isInvalid()) {
+for (auto &E : ArgExprs)
+Actions.CorrectDelayedTyposInExpr(E);
+}
+}
+}
+// Match the ')'.
+if (LHS.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+} else if (Tok.isNot(tok::r_paren)) {
+bool HadDelayedTypo = false;
+if (Actions.CorrectDelayedTyposInExpr(LHS).get() != LHS.get())
+HadDelayedTypo = true;
+for (auto &E : ArgExprs)
+if (Actions.CorrectDelayedTyposInExpr(E).get() != E)
+HadDelayedTypo = true;
+// If there were delayed typos in the LHS or ArgExprs, call SkipUntil
+// instead of PT.consumeClose() to avoid emitting extra diagnostics for
+// the unmatched l_paren.
+if (HadDelayedTypo)
+SkipUntil(tok::r_paren, StopAtSemi);
+else
+PT.consumeClose();
+LHS = ExprError();
+} else {
+assert((ArgExprs.size() == 0 ||
+ArgExprs.size()-1 == CommaLocs.size())&&
+"Unexpected number of commas!");
+LHS = Actions.ActOnCallExpr(getCurScope(), LHS.get(), Loc,
+ArgExprs, Tok.getLocation(),
+ExecConfig);
+PT.consumeClose();
+}
+break;
+}
+case tok::arrow:
+case tok::period: {
+// postfix-expression: p-e '->' template[opt] id-expression
+// postfix-expression: p-e '.' template[opt] id-expression
+tok::TokenKind OpKind = Tok.getKind();
+SourceLocation OpLoc = ConsumeToken();  // Eat the "." or "->" token.
+CXXScopeSpec SS;
+ParsedType ObjectType;
+bool MayBePseudoDestructor = false;
+Expr* OrigLHS = !LHS.isInvalid() ? LHS.get() : nullptr;
+PreferredType.enterMemAccess(Actions, Tok.getLocation(), OrigLHS);
+if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
+Expr *Base = OrigLHS;
+const Type* BaseType = Base->getType().getTypePtrOrNull();
+if (BaseType && Tok.is(tok::l_paren) &&
+(BaseType->isFunctionType() ||
+BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) {
+Diag(OpLoc, diag::err_function_is_not_record)
+<< OpKind << Base->getSourceRange()
+<< FixItHint::CreateRemoval(OpLoc);
+return ParsePostfixExpressionSuffix(Base);
+}
+LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base,
+OpLoc, OpKind, ObjectType,
+MayBePseudoDestructor);
+if (LHS.isInvalid())
+break;
+ParseOptionalCXXScopeSpecifier(SS, ObjectType,
+/*EnteringContext=*/false,
+&MayBePseudoDestructor);
+if (SS.isNotEmpty())
+ObjectType = nullptr;
+}
+if (Tok.is(tok::code_completion)) {
+tok::TokenKind CorrectedOpKind =
+OpKind == tok::arrow ? tok::period : tok::arrow;
+ExprResult CorrectedLHS(/*Invalid=*/true);
+if (getLangOpts().CPlusPlus && OrigLHS) {
+// FIXME: Creating a TentativeAnalysisScope from outside Sema is a
+// hack.
+Sema::TentativeAnalysisScope Trap(Actions);
+CorrectedLHS = Actions.ActOnStartCXXMemberReference(
+getCurScope(), OrigLHS, OpLoc, CorrectedOpKind, ObjectType,
+MayBePseudoDestructor);
+}
+Expr *Base = LHS.get();
+Expr *CorrectedBase = CorrectedLHS.get();
+if (!CorrectedBase && !getLangOpts().CPlusPlus)
+CorrectedBase = Base;
+// Code completion for a member access expression.
+Actions.CodeCompleteMemberReferenceExpr(
+getCurScope(), Base, CorrectedBase, OpLoc, OpKind == tok::arrow,
+Base && ExprStatementTokLoc == Base->getBeginLoc(),
+PreferredType.get(Tok.getLocation()));
+cutOffParsing();
+return ExprError();
+}
+if (MayBePseudoDestructor && !LHS.isInvalid()) {
+LHS = ParseCXXPseudoDestructor(LHS.get(), OpLoc, OpKind, SS,
+ObjectType);
+break;
+}
+// Either the action has told us that this cannot be a
+// pseudo-destructor expression (based on the type of base
+// expression), or we didn't see a '~' in the right place. We
+// can still parse a destructor name here, but in that case it
+// names a real destructor.
+// Allow explicit constructor calls in Microsoft mode.
+// FIXME: Add support for explicit call of template constructor.
+SourceLocation TemplateKWLoc;
+UnqualifiedId Name;
+if (getLangOpts().ObjC && OpKind == tok::period &&
+Tok.is(tok::kw_class)) {
+// Objective-C++:
+//   After a '.' in a member access expression, treat the keyword
+//   'class' as if it were an identifier.
+//
+// This hack allows property access to the 'class' method because it is
+// such a common method name. For other C++ keywords that are
+// Objective-C method names, one must use the message send syntax.
+IdentifierInfo *Id = Tok.getIdentifierInfo();
+SourceLocation Loc = ConsumeToken();
+Name.setIdentifier(Id, Loc);
+} else if (ParseUnqualifiedId(SS,
+/*EnteringContext=*/false,
+/*AllowDestructorName=*/true,
+/*AllowConstructorName=*/
+getLangOpts().MicrosoftExt &&
+SS.isNotEmpty(),
+/*AllowDeductionGuide=*/false,
+ObjectType, &TemplateKWLoc, Name)) {
+(void)Actions.CorrectDelayedTyposInExpr(LHS);
+LHS = ExprError();
+}
+if (!LHS.isInvalid())
+LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.get(), OpLoc,
+OpKind, SS, TemplateKWLoc, Name,
+CurParsedObjCImpl ? CurParsedObjCImpl->Dcl
+: nullptr);
+if (!LHS.isInvalid() && Tok.is(tok::less))
+checkPotentialAngleBracket(LHS);
+break;
+}
+case tok::plusplus:    // postfix-expression: postfix-expression '++'
+case tok::minusminus:  // postfix-expression: postfix-expression '--'
+if (!LHS.isInvalid()) {
+LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
+Tok.getKind(), LHS.get());
+}
+ConsumeToken();
+break;
+}
+}
+}
+/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
+/// vec_step and we are at the start of an expression or a parenthesized
+/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
+/// expression (isCastExpr == false) or the type (isCastExpr == true).
+///
+/// \verbatim
+///       unary-expression:  [C99 6.5.3]
+///         'sizeof' unary-expression
+///         'sizeof' '(' type-name ')'
+/// [GNU]   '__alignof' unary-expression
+/// [GNU]   '__alignof' '(' type-name ')'
+/// [C11]   '_Alignof' '(' type-name ')'
+/// [C++0x] 'alignof' '(' type-id ')'
+///
+/// [GNU]   typeof-specifier:
+///           typeof ( expressions )
+///           typeof ( type-name )
+/// [GNU/C++] typeof unary-expression
+///
+/// [OpenCL 1.1 6.11.12] vec_step built-in function:
+///           vec_step ( expressions )
+///           vec_step ( type-name )
+/// \endverbatim
+ExprResult
+Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
+bool &isCastExpr,
+ParsedType &CastTy,
+SourceRange &CastRange) {
+assert(OpTok.isOneOf(tok::kw_typeof, tok::kw_sizeof, tok::kw___alignof,
+tok::kw_alignof, tok::kw__Alignof, tok::kw_vec_step,
+tok::kw___builtin_omp_required_simd_align) &&
+"Not a typeof/sizeof/alignof/vec_step expression!");
+ExprResult Operand;
+// If the operand doesn't start with an '(', it must be an expression.
+if (Tok.isNot(tok::l_paren)) {
+// If construct allows a form without parenthesis, user may forget to put
+// pathenthesis around type name.
+if (OpTok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
+tok::kw__Alignof)) {
+if (isTypeIdUnambiguously()) {
+DeclSpec DS(AttrFactory);
+ParseSpecifierQualifierList(DS);
+Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
+ParseDeclarator(DeclaratorInfo);
+SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation());
+SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation);
+Diag(LParenLoc, diag::err_expected_parentheses_around_typename)
+<< OpTok.getName()
+<< FixItHint::CreateInsertion(LParenLoc, "(")
+<< FixItHint::CreateInsertion(RParenLoc, ")");
+isCastExpr = true;
+return ExprEmpty();
+}
+}
+isCastExpr = false;
+if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
+Diag(Tok, diag::err_expected_after) << OpTok.getIdentifierInfo()
+<< tok::l_paren;
+return ExprError();
+}
+Operand = ParseCastExpression(UnaryExprOnly);
+} else {
+// If it starts with a '(', we know that it is either a parenthesized
+// type-name, or it is a unary-expression that starts with a compound
+// literal, or starts with a primary-expression that is a parenthesized
+// expression.
+ParenParseOption ExprType = CastExpr;
+SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
+Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
+false, CastTy, RParenLoc);
+CastRange = SourceRange(LParenLoc, RParenLoc);
+// If ParseParenExpression parsed a '(typename)' sequence only, then this is
+// a type.
+if (ExprType == CastExpr) {
+isCastExpr = true;
+return ExprEmpty();
+}
+if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
+// GNU typeof in C requires the expression to be parenthesized. Not so for
+// sizeof/alignof or in C++. Therefore, the parenthesized expression is
+// the start of a unary-expression, but doesn't include any postfix
+// pieces. Parse these now if present.
+if (!Operand.isInvalid())
+Operand = ParsePostfixExpressionSuffix(Operand.get());
+}
+}
+// If we get here, the operand to the typeof/sizeof/alignof was an expression.
+isCastExpr = false;
+return Operand;
+}
+/// Parse a sizeof or alignof expression.
+///
+/// \verbatim
+///       unary-expression:  [C99 6.5.3]
+///         'sizeof' unary-expression
+///         'sizeof' '(' type-name ')'
+/// [C++11] 'sizeof' '...' '(' identifier ')'
+/// [GNU]   '__alignof' unary-expression
+/// [GNU]   '__alignof' '(' type-name ')'
+/// [C11]   '_Alignof' '(' type-name ')'
+/// [C++11] 'alignof' '(' type-id ')'
+/// \endverbatim
+ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
+assert(Tok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
+tok::kw__Alignof, tok::kw_vec_step,
+tok::kw___builtin_omp_required_simd_align) &&
+"Not a sizeof/alignof/vec_step expression!");
+Token OpTok = Tok;
+ConsumeToken();
+// [C++11] 'sizeof' '...' '(' identifier ')'
+if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
+SourceLocation EllipsisLoc = ConsumeToken();
+SourceLocation LParenLoc, RParenLoc;
+IdentifierInfo *Name = nullptr;
+SourceLocation NameLoc;
+if (Tok.is(tok::l_paren)) {
+BalancedDelimiterTracker T(*this, tok::l_paren);
+T.consumeOpen();
+LParenLoc = T.getOpenLocation();
+if (Tok.is(tok::identifier)) {
+Name = Tok.getIdentifierInfo();
+NameLoc = ConsumeToken();
+T.consumeClose();
+RParenLoc = T.getCloseLocation();
+if (RParenLoc.isInvalid())
+RParenLoc = PP.getLocForEndOfToken(NameLoc);
+} else {
+Diag(Tok, diag::err_expected_parameter_pack);
+SkipUntil(tok::r_paren, StopAtSemi);
+}
+} else if (Tok.is(tok::identifier)) {
+Name = Tok.getIdentifierInfo();
+NameLoc = ConsumeToken();
+LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
+RParenLoc = PP.getLocForEndOfToken(NameLoc);
+Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
+<< Name
+<< FixItHint::CreateInsertion(LParenLoc, "(")
+<< FixItHint::CreateInsertion(RParenLoc, ")");
+} else {
+Diag(Tok, diag::err_sizeof_parameter_pack);
+}
+if (!Name)
+return ExprError();
+EnterExpressionEvaluationContext Unevaluated(
+Actions, Sema::ExpressionEvaluationContext::Unevaluated,
+Sema::ReuseLambdaContextDecl);
+return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
+OpTok.getLocation(),
+*Name, NameLoc,
+RParenLoc);
+}
+if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
+Diag(OpTok, diag::warn_cxx98_compat_alignof);
+EnterExpressionEvaluationContext Unevaluated(
+Actions, Sema::ExpressionEvaluationContext::Unevaluated,
+Sema::ReuseLambdaContextDecl);
+bool isCastExpr;
+ParsedType CastTy;
+SourceRange CastRange;
+ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
+isCastExpr,
+CastTy,
+CastRange);
+UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
+if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
+ExprKind = UETT_AlignOf;
+else if (OpTok.is(tok::kw___alignof))
+ExprKind = UETT_PreferredAlignOf;
+else if (OpTok.is(tok::kw_vec_step))
+ExprKind = UETT_VecStep;
+else if (OpTok.is(tok::kw___builtin_omp_required_simd_align))
+ExprKind = UETT_OpenMPRequiredSimdAlign;
+if (isCastExpr)
+return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
+ExprKind,
+/*IsType=*/true,
+CastTy.getAsOpaquePtr(),
+CastRange);
+if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
+Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
+// If we get here, the operand to the sizeof/alignof was an expression.
+if (!Operand.isInvalid())
+Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
+ExprKind,
+/*IsType=*/false,
+Operand.get(),
+CastRange);
+return Operand;
+}
+/// ParseBuiltinPrimaryExpression
+///
+/// \verbatim
+///       primary-expression: [C99 6.5.1]
+/// [GNU]   '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
+/// [GNU]   '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
+/// [GNU]   '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
+///                                     assign-expr ')'
+/// [GNU]   '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
+/// [GNU]   '__builtin_FILE' '(' ')'
+/// [GNU]   '__builtin_FUNCTION' '(' ')'
+/// [GNU]   '__builtin_LINE' '(' ')'
+/// [CLANG] '__builtin_COLUMN' '(' ')'
+/// [OCL]   '__builtin_astype' '(' assignment-expression ',' type-name ')'
+///
+/// [GNU] offsetof-member-designator:
+/// [GNU]   identifier
+/// [GNU]   offsetof-member-designator '.' identifier
+/// [GNU]   offsetof-member-designator '[' expression ']'
+/// \endverbatim
+ExprResult Parser::ParseBuiltinPrimaryExpression() {
+ExprResult Res;
+const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
+tok::TokenKind T = Tok.getKind();
+SourceLocation StartLoc = ConsumeToken();   // Eat the builtin identifier.
+// All of these start with an open paren.
+if (Tok.isNot(tok::l_paren))
+return ExprError(Diag(Tok, diag::err_expected_after) << BuiltinII
+<< tok::l_paren);
+BalancedDelimiterTracker PT(*this, tok::l_paren);
+PT.consumeOpen();
+// TODO: Build AST.
+switch (T) {
+default: llvm_unreachable("Not a builtin primary expression!");
+case tok::kw___builtin_va_arg: {
+ExprResult Expr(ParseAssignmentExpression());
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+Expr = ExprError();
+}
+TypeResult Ty = ParseTypeName();
+if (Tok.isNot(tok::r_paren)) {
+Diag(Tok, diag::err_expected) << tok::r_paren;
+Expr = ExprError();
+}
+if (Expr.isInvalid() || Ty.isInvalid())
+Res = ExprError();
+else
+Res = Actions.ActOnVAArg(StartLoc, Expr.get(), Ty.get(), ConsumeParen());
+break;
+}
+case tok::kw___builtin_offsetof: {
+SourceLocation TypeLoc = Tok.getLocation();
+TypeResult Ty = ParseTypeName();
+if (Ty.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+// We must have at least one identifier here.
+if (Tok.isNot(tok::identifier)) {
+Diag(Tok, diag::err_expected) << tok::identifier;
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+// Keep track of the various subcomponents we see.
+SmallVector<Sema::OffsetOfComponent, 4> Comps;
+Comps.push_back(Sema::OffsetOfComponent());
+Comps.back().isBrackets = false;
+Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
+Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
+// FIXME: This loop leaks the index expressions on error.
+while (1) {
+if (Tok.is(tok::period)) {
+// offsetof-member-designator: offsetof-member-designator '.' identifier
+Comps.push_back(Sema::OffsetOfComponent());
+Comps.back().isBrackets = false;
+Comps.back().LocStart = ConsumeToken();
+if (Tok.isNot(tok::identifier)) {
+Diag(Tok, diag::err_expected) << tok::identifier;
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
+Comps.back().LocEnd = ConsumeToken();
+} else if (Tok.is(tok::l_square)) {
+if (CheckProhibitedCXX11Attribute())
+return ExprError();
+// offsetof-member-designator: offsetof-member-design '[' expression ']'
+Comps.push_back(Sema::OffsetOfComponent());
+Comps.back().isBrackets = true;
+BalancedDelimiterTracker ST(*this, tok::l_square);
+ST.consumeOpen();
+Comps.back().LocStart = ST.getOpenLocation();
+Res = ParseExpression();
+if (Res.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return Res;
+}
+Comps.back().U.E = Res.get();
+ST.consumeClose();
+Comps.back().LocEnd = ST.getCloseLocation();
+} else {
+if (Tok.isNot(tok::r_paren)) {
+PT.consumeClose();
+Res = ExprError();
+} else if (Ty.isInvalid()) {
+Res = ExprError();
+} else {
+PT.consumeClose();
+Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
+Ty.get(), Comps,
+PT.getCloseLocation());
+}
+break;
+}
+}
+break;
+}
+case tok::kw___builtin_choose_expr: {
+ExprResult Cond(ParseAssignmentExpression());
+if (Cond.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return Cond;
+}
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+ExprResult Expr1(ParseAssignmentExpression());
+if (Expr1.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return Expr1;
+}
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+ExprResult Expr2(ParseAssignmentExpression());
+if (Expr2.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return Expr2;
+}
+if (Tok.isNot(tok::r_paren)) {
+Diag(Tok, diag::err_expected) << tok::r_paren;
+return ExprError();
+}
+Res = Actions.ActOnChooseExpr(StartLoc, Cond.get(), Expr1.get(),
+Expr2.get(), ConsumeParen());
+break;
+}
+case tok::kw___builtin_astype: {
+// The first argument is an expression to be converted, followed by a comma.
+ExprResult Expr(ParseAssignmentExpression());
+if (Expr.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+// Second argument is the type to bitcast to.
+TypeResult DestTy = ParseTypeName();
+if (DestTy.isInvalid())
+return ExprError();
+// Attempt to consume the r-paren.
+if (Tok.isNot(tok::r_paren)) {
+Diag(Tok, diag::err_expected) << tok::r_paren;
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+Res = Actions.ActOnAsTypeExpr(Expr.get(), DestTy.get(), StartLoc,
+ConsumeParen());
+break;
+}
+case tok::kw___builtin_convertvector: {
+// The first argument is an expression to be converted, followed by a comma.
+ExprResult Expr(ParseAssignmentExpression());
+if (Expr.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+// Second argument is the type to bitcast to.
+TypeResult DestTy = ParseTypeName();
+if (DestTy.isInvalid())
+return ExprError();
+// Attempt to consume the r-paren.
+if (Tok.isNot(tok::r_paren)) {
+Diag(Tok, diag::err_expected) << tok::r_paren;
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+Res = Actions.ActOnConvertVectorExpr(Expr.get(), DestTy.get(), StartLoc,
+ConsumeParen());
+break;
+}
+case tok::kw___builtin_COLUMN:
+case tok::kw___builtin_FILE:
+case tok::kw___builtin_FUNCTION:
+case tok::kw___builtin_LINE: {
+// Attempt to consume the r-paren.
+if (Tok.isNot(tok::r_paren)) {
+Diag(Tok, diag::err_expected) << tok::r_paren;
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+SourceLocExpr::IdentKind Kind = [&] {
+switch (T) {
+case tok::kw___builtin_FILE:
+return SourceLocExpr::File;
+case tok::kw___builtin_FUNCTION:
+return SourceLocExpr::Function;
+case tok::kw___builtin_LINE:
+return SourceLocExpr::Line;
+case tok::kw___builtin_COLUMN:
+return SourceLocExpr::Column;
+default:
+llvm_unreachable("invalid keyword");
+}
+}();
+Res = Actions.ActOnSourceLocExpr(Kind, StartLoc, ConsumeParen());
+break;
+}
+}
+if (Res.isInvalid())
+return ExprError();
+// These can be followed by postfix-expr pieces because they are
+// primary-expressions.
+return ParsePostfixExpressionSuffix(Res.get());
+}
+/// ParseParenExpression - This parses the unit that starts with a '(' token,
+/// based on what is allowed by ExprType.  The actual thing parsed is returned
+/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
+/// not the parsed cast-expression.
+///
+/// \verbatim
+///       primary-expression: [C99 6.5.1]
+///         '(' expression ')'
+/// [GNU]   '(' compound-statement ')'      (if !ParenExprOnly)
+///       postfix-expression: [C99 6.5.2]
+///         '(' type-name ')' '{' initializer-list '}'
+///         '(' type-name ')' '{' initializer-list ',' '}'
+///       cast-expression: [C99 6.5.4]
+///         '(' type-name ')' cast-expression
+/// [ARC]   bridged-cast-expression
+/// [ARC] bridged-cast-expression:
+///         (__bridge type-name) cast-expression
+///         (__bridge_transfer type-name) cast-expression
+///         (__bridge_retained type-name) cast-expression
+///       fold-expression: [C++1z]
+///         '(' cast-expression fold-operator '...' ')'
+///         '(' '...' fold-operator cast-expression ')'
+///         '(' cast-expression fold-operator '...'
+///                 fold-operator cast-expression ')'
+/// \endverbatim
+ExprResult
+Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
+bool isTypeCast, ParsedType &CastTy,
+SourceLocation &RParenLoc) {
+assert(Tok.is(tok::l_paren) && "Not a paren expr!");
+ColonProtectionRAIIObject ColonProtection(*this, false);
+BalancedDelimiterTracker T(*this, tok::l_paren);
+if (T.consumeOpen())
+return ExprError();
+SourceLocation OpenLoc = T.getOpenLocation();
+PreferredType.enterParenExpr(Tok.getLocation(), OpenLoc);
+ExprResult Result(true);
+bool isAmbiguousTypeId;
+CastTy = nullptr;
+if (Tok.is(tok::code_completion)) {
+Actions.CodeCompleteExpression(
+getCurScope(), PreferredType.get(Tok.getLocation()),
+/*IsParenthesized=*/ExprType >= CompoundLiteral);
+cutOffParsing();
+return ExprError();
+}
+// Diagnose use of bridge casts in non-arc mode.
+bool BridgeCast = (getLangOpts().ObjC &&
+Tok.isOneOf(tok::kw___bridge,
+tok::kw___bridge_transfer,
+tok::kw___bridge_retained,
+tok::kw___bridge_retain));
+if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
+if (!TryConsumeToken(tok::kw___bridge)) {
+StringRef BridgeCastName = Tok.getName();
+SourceLocation BridgeKeywordLoc = ConsumeToken();
+if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
+Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
+<< BridgeCastName
+<< FixItHint::CreateReplacement(BridgeKeywordLoc, "");
+}
+BridgeCast = false;
+}
+// None of these cases should fall through with an invalid Result
+// unless they've already reported an error.
+if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
+Diag(Tok, diag::ext_gnu_statement_expr);
+if (!getCurScope()->getFnParent() && !getCurScope()->getBlockParent()) {
+Result = ExprError(Diag(OpenLoc, diag::err_stmtexpr_file_scope));
+} else {
+// Find the nearest non-record decl context. Variables declared in a
+// statement expression behave as if they were declared in the enclosing
+// function, block, or other code construct.
+DeclContext *CodeDC = Actions.CurContext;
+while (CodeDC->isRecord() || isa<EnumDecl>(CodeDC)) {
+CodeDC = CodeDC->getParent();
+assert(CodeDC && !CodeDC->isFileContext() &&
+"statement expr not in code context");
+}
+Sema::ContextRAII SavedContext(Actions, CodeDC, /*NewThisContext=*/false);
+Actions.ActOnStartStmtExpr();
+StmtResult Stmt(ParseCompoundStatement(true));
+ExprType = CompoundStmt;
+// If the substmt parsed correctly, build the AST node.
+if (!Stmt.isInvalid()) {
+Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.get(), Tok.getLocation());
+} else {
+Actions.ActOnStmtExprError();
+}
+}
+} else if (ExprType >= CompoundLiteral && BridgeCast) {
+tok::TokenKind tokenKind = Tok.getKind();
+SourceLocation BridgeKeywordLoc = ConsumeToken();
+// Parse an Objective-C ARC ownership cast expression.
+ObjCBridgeCastKind Kind;
+if (tokenKind == tok::kw___bridge)
+Kind = OBC_Bridge;
+else if (tokenKind == tok::kw___bridge_transfer)
+Kind = OBC_BridgeTransfer;
+else if (tokenKind == tok::kw___bridge_retained)
+Kind = OBC_BridgeRetained;
+else {
+// As a hopefully temporary workaround, allow __bridge_retain as
+// a synonym for __bridge_retained, but only in system headers.
+assert(tokenKind == tok::kw___bridge_retain);
+Kind = OBC_BridgeRetained;
+if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
+Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
+<< FixItHint::CreateReplacement(BridgeKeywordLoc,
+"__bridge_retained");
+}
+TypeResult Ty = ParseTypeName();
+T.consumeClose();
+ColonProtection.restore();
+RParenLoc = T.getCloseLocation();
+PreferredType.enterTypeCast(Tok.getLocation(), Ty.get().get());
+ExprResult SubExpr = ParseCastExpression(AnyCastExpr);
+if (Ty.isInvalid() || SubExpr.isInvalid())
+return ExprError();
+return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
+BridgeKeywordLoc, Ty.get(),
+RParenLoc, SubExpr.get());
+} else if (ExprType >= CompoundLiteral &&
+isTypeIdInParens(isAmbiguousTypeId)) {
+// Otherwise, this is a compound literal expression or cast expression.
+// In C++, if the type-id is ambiguous we disambiguate based on context.
+// If stopIfCastExpr is true the context is a typeof/sizeof/alignof
+// in which case we should treat it as type-id.
+// if stopIfCastExpr is false, we need to determine the context past the
+// parens, so we defer to ParseCXXAmbiguousParenExpression for that.
+if (isAmbiguousTypeId && !stopIfCastExpr) {
+ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T,
+ColonProtection);
+RParenLoc = T.getCloseLocation();
+return res;
+}
+// Parse the type declarator.
+DeclSpec DS(AttrFactory);
+ParseSpecifierQualifierList(DS);
+Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
+ParseDeclarator(DeclaratorInfo);
+// If our type is followed by an identifier and either ':' or ']', then
+// this is probably an Objective-C message send where the leading '[' is
+// missing. Recover as if that were the case.
+if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
+!InMessageExpression && getLangOpts().ObjC &&
+(NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
+TypeResult Ty;
+{
+InMessageExpressionRAIIObject InMessage(*this, false);
+Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
+}
+Result = ParseObjCMessageExpressionBody(SourceLocation(),
+SourceLocation(),
+Ty.get(), nullptr);
+} else {
+// Match the ')'.
+T.consumeClose();
+ColonProtection.restore();
+RParenLoc = T.getCloseLocation();
+if (Tok.is(tok::l_brace)) {
+ExprType = CompoundLiteral;
+TypeResult Ty;
+{
+InMessageExpressionRAIIObject InMessage(*this, false);
+Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
+}
+return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
+}
+if (Tok.is(tok::l_paren)) {
+// This could be OpenCL vector Literals
+if (getLangOpts().OpenCL)
+{
+TypeResult Ty;
+{
+InMessageExpressionRAIIObject InMessage(*this, false);
+Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
+}
+if(Ty.isInvalid())
+{
+return ExprError();
+}
+QualType QT = Ty.get().get().getCanonicalType();
+if (QT->isVectorType())
+{
+// We parsed '(' vector-type-name ')' followed by '('
+// Parse the cast-expression that follows it next.
+// isVectorLiteral = true will make sure we don't parse any
+// Postfix expression yet
+Result = ParseCastExpression(/*isUnaryExpression=*/AnyCastExpr,
+/*isAddressOfOperand=*/false,
+/*isTypeCast=*/IsTypeCast,
+/*isVectorLiteral=*/true);
+if (!Result.isInvalid()) {
+Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
+DeclaratorInfo, CastTy,
+RParenLoc, Result.get());
+}
+// After we performed the cast we can check for postfix-expr pieces.
+if (!Result.isInvalid()) {
+Result = ParsePostfixExpressionSuffix(Result);
+}
+return Result;
+}
+}
+}
+if (ExprType == CastExpr) {
+// We parsed '(' type-name ')' and the thing after it wasn't a '{'.
+if (DeclaratorInfo.isInvalidType())
+return ExprError();
+// Note that this doesn't parse the subsequent cast-expression, it just
+// returns the parsed type to the callee.
+if (stopIfCastExpr) {
+TypeResult Ty;
+{
+InMessageExpressionRAIIObject InMessage(*this, false);
+Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
+}
+CastTy = Ty.get();
+return ExprResult();
+}
+// Reject the cast of super idiom in ObjC.
+if (Tok.is(tok::identifier) && getLangOpts().ObjC &&
+Tok.getIdentifierInfo() == Ident_super &&
+getCurScope()->isInObjcMethodScope() &&
+GetLookAheadToken(1).isNot(tok::period)) {
+Diag(Tok.getLocation(), diag::err_illegal_super_cast)
+<< SourceRange(OpenLoc, RParenLoc);
+return ExprError();
+}
+PreferredType.enterTypeCast(Tok.getLocation(), CastTy.get());
+// Parse the cast-expression that follows it next.
+// TODO: For cast expression with CastTy.
+Result = ParseCastExpression(/*isUnaryExpression=*/AnyCastExpr,
+/*isAddressOfOperand=*/false,
+/*isTypeCast=*/IsTypeCast);
+if (!Result.isInvalid()) {
+Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
+DeclaratorInfo, CastTy,
+RParenLoc, Result.get());
+}
+return Result;
+}
+Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
+return ExprError();
+}
+} else if (ExprType >= FoldExpr && Tok.is(tok::ellipsis) &&
+isFoldOperator(NextToken().getKind())) {
+ExprType = FoldExpr;
+return ParseFoldExpression(ExprResult(), T);
+} else if (isTypeCast) {
+// Parse the expression-list.
+InMessageExpressionRAIIObject InMessage(*this, false);
+ExprVector ArgExprs;
+CommaLocsTy CommaLocs;
+if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) {
+// FIXME: If we ever support comma expressions as operands to
+// fold-expressions, we'll need to allow multiple ArgExprs here.
+if (ExprType >= FoldExpr && ArgExprs.size() == 1 &&
+isFoldOperator(Tok.getKind()) && NextToken().is(tok::ellipsis)) {
+ExprType = FoldExpr;
+return ParseFoldExpression(ArgExprs[0], T);
+}
+ExprType = SimpleExpr;
+Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
+ArgExprs);
+}
+} else {
+InMessageExpressionRAIIObject InMessage(*this, false);
+Result = ParseExpression(MaybeTypeCast);
+if (!getLangOpts().CPlusPlus && MaybeTypeCast && Result.isUsable()) {
+// Correct typos in non-C++ code earlier so that implicit-cast-like
+// expressions are parsed correctly.
+Result = Actions.CorrectDelayedTyposInExpr(Result);
+}
+if (ExprType >= FoldExpr && isFoldOperator(Tok.getKind()) &&
+NextToken().is(tok::ellipsis)) {
+ExprType = FoldExpr;
+return ParseFoldExpression(Result, T);
+}
+ExprType = SimpleExpr;
+// Don't build a paren expression unless we actually match a ')'.
+if (!Result.isInvalid() && Tok.is(tok::r_paren))
+Result =
+Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.get());
+}
+// Match the ')'.
+if (Result.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+T.consumeClose();
+RParenLoc = T.getCloseLocation();
+return Result;
+}
+/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
+/// and we are at the left brace.
+///
+/// \verbatim
+///       postfix-expression: [C99 6.5.2]
+///         '(' type-name ')' '{' initializer-list '}'
+///         '(' type-name ')' '{' initializer-list ',' '}'
+/// \endverbatim
+ExprResult
+Parser::ParseCompoundLiteralExpression(ParsedType Ty,
+SourceLocation LParenLoc,
+SourceLocation RParenLoc) {
+assert(Tok.is(tok::l_brace) && "Not a compound literal!");
+if (!getLangOpts().C99)   // Compound literals don't exist in C90.
+Diag(LParenLoc, diag::ext_c99_compound_literal);
+ExprResult Result = ParseInitializer();
+if (!Result.isInvalid() && Ty)
+return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.get());
+return Result;
+}
+/// ParseStringLiteralExpression - This handles the various token types that
+/// form string literals, and also handles string concatenation [C99 5.1.1.2,
+/// translation phase #6].
+///
+/// \verbatim
+///       primary-expression: [C99 6.5.1]
+///         string-literal
+/// \verbatim
+ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
+assert(isTokenStringLiteral() && "Not a string literal!");
+// String concat.  Note that keywords like __func__ and __FUNCTION__ are not
+// considered to be strings for concatenation purposes.
+SmallVector<Token, 4> StringToks;
+do {
+StringToks.push_back(Tok);
+ConsumeStringToken();
+} while (isTokenStringLiteral());
+// Pass the set of string tokens, ready for concatenation, to the actions.
+return Actions.ActOnStringLiteral(StringToks,
+AllowUserDefinedLiteral ? getCurScope()
+: nullptr);
+}
+/// ParseGenericSelectionExpression - Parse a C11 generic-selection
+/// [C11 6.5.1.1].
+///
+/// \verbatim
+///    generic-selection:
+///           _Generic ( assignment-expression , generic-assoc-list )
+///    generic-assoc-list:
+///           generic-association
+///           generic-assoc-list , generic-association
+///    generic-association:
+///           type-name : assignment-expression
+///           default : assignment-expression
+/// \endverbatim
+ExprResult Parser::ParseGenericSelectionExpression() {
+assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected");
+if (!getLangOpts().C11)
+Diag(Tok, diag::ext_c11_feature) << Tok.getName();
+SourceLocation KeyLoc = ConsumeToken();
+BalancedDelimiterTracker T(*this, tok::l_paren);
+if (T.expectAndConsume())
+return ExprError();
+ExprResult ControllingExpr;
+{
+// C11 6.5.1.1p3 "The controlling expression of a generic selection is
+// not evaluated."
+EnterExpressionEvaluationContext Unevaluated(
+Actions, Sema::ExpressionEvaluationContext::Unevaluated);
+ControllingExpr =
+Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
+if (ControllingExpr.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+}
+if (ExpectAndConsume(tok::comma)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+SourceLocation DefaultLoc;
+TypeVector Types;
+ExprVector Exprs;
+do {
+ParsedType Ty;
+if (Tok.is(tok::kw_default)) {
+// C11 6.5.1.1p2 "A generic selection shall have no more than one default
+// generic association."
+if (!DefaultLoc.isInvalid()) {
+Diag(Tok, diag::err_duplicate_default_assoc);
+Diag(DefaultLoc, diag::note_previous_default_assoc);
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+DefaultLoc = ConsumeToken();
+Ty = nullptr;
+} else {
+ColonProtectionRAIIObject X(*this);
+TypeResult TR = ParseTypeName();
+if (TR.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+Ty = TR.get();
+}
+Types.push_back(Ty);
+if (ExpectAndConsume(tok::colon)) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+// FIXME: These expressions should be parsed in a potentially potentially
+// evaluated context.
+ExprResult ER(
+Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
+if (ER.isInvalid()) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+Exprs.push_back(ER.get());
+} while (TryConsumeToken(tok::comma));
+T.consumeClose();
+if (T.getCloseLocation().isInvalid())
+return ExprError();
+return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
+T.getCloseLocation(),
+ControllingExpr.get(),
+Types, Exprs);
+}
+/// Parse A C++1z fold-expression after the opening paren and optional
+/// left-hand-side expression.
+///
+/// \verbatim
+///   fold-expression:
+///       ( cast-expression fold-operator ... )
+///       ( ... fold-operator cast-expression )
+///       ( cast-expression fold-operator ... fold-operator cast-expression )
+ExprResult Parser::ParseFoldExpression(ExprResult LHS,
+BalancedDelimiterTracker &T) {
+if (LHS.isInvalid()) {
+T.skipToEnd();
+return true;
+}
+tok::TokenKind Kind = tok::unknown;
+SourceLocation FirstOpLoc;
+if (LHS.isUsable()) {
+Kind = Tok.getKind();
+assert(isFoldOperator(Kind) && "missing fold-operator");
+FirstOpLoc = ConsumeToken();
+}
+assert(Tok.is(tok::ellipsis) && "not a fold-expression");
+SourceLocation EllipsisLoc = ConsumeToken();
+ExprResult RHS;
+if (Tok.isNot(tok::r_paren)) {
+if (!isFoldOperator(Tok.getKind()))
+return Diag(Tok.getLocation(), diag::err_expected_fold_operator);
+if (Kind != tok::unknown && Tok.getKind() != Kind)
+Diag(Tok.getLocation(), diag::err_fold_operator_mismatch)
+<< SourceRange(FirstOpLoc);
+Kind = Tok.getKind();
+ConsumeToken();
+RHS = ParseExpression();
+if (RHS.isInvalid()) {
+T.skipToEnd();
+return true;
+}
+}
+Diag(EllipsisLoc, getLangOpts().CPlusPlus17
+? diag::warn_cxx14_compat_fold_expression
+: diag::ext_fold_expression);
+T.consumeClose();
+return Actions.ActOnCXXFoldExpr(T.getOpenLocation(), LHS.get(), Kind,
+EllipsisLoc, RHS.get(), T.getCloseLocation());
+}
+/// ParseExpressionList - Used for C/C++ (argument-)expression-list.
+///
+/// \verbatim
+///       argument-expression-list:
+///         assignment-expression
+///         argument-expression-list , assignment-expression
+///
+/// [C++] expression-list:
+/// [C++]   assignment-expression
+/// [C++]   expression-list , assignment-expression
+///
+/// [C++0x] expression-list:
+/// [C++0x]   initializer-list
+///
+/// [C++0x] initializer-list
+/// [C++0x]   initializer-clause ...[opt]
+/// [C++0x]   initializer-list , initializer-clause ...[opt]
+///
+/// [C++0x] initializer-clause:
+/// [C++0x]   assignment-expression
+/// [C++0x]   braced-init-list
+/// \endverbatim
+bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
+SmallVectorImpl<SourceLocation> &CommaLocs,
+llvm::function_ref<void()> ExpressionStarts) {
+bool SawError = false;
+while (1) {
+if (ExpressionStarts)
+ExpressionStarts();
+ExprResult Expr;
+if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
+Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
+Expr = ParseBraceInitializer();
+} else
+Expr = ParseAssignmentExpression();
+if (Tok.is(tok::ellipsis))
+Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
+else if (Tok.is(tok::code_completion)) {
+// There's nothing to suggest in here as we parsed a full expression.
+// Instead fail and propogate the error since caller might have something
+// the suggest, e.g. signature help in function call. Note that this is
+// performed before pushing the \p Expr, so that signature help can report
+// current argument correctly.
+SawError = true;
+cutOffParsing();
+break;
+}
+if (Expr.isInvalid()) {
+SkipUntil(tok::comma, tok::r_paren, StopBeforeMatch);
+SawError = true;
+} else {
+Exprs.push_back(Expr.get());
+}
+if (Tok.isNot(tok::comma))
+break;
+// Move to the next argument, remember where the comma was.
+Token Comma = Tok;
+CommaLocs.push_back(ConsumeToken());
+checkPotentialAngleBracketDelimiter(Comma);
+}
+if (SawError) {
+// Ensure typos get diagnosed when errors were encountered while parsing the
+// expression list.
+for (auto &E : Exprs) {
+ExprResult Expr = Actions.CorrectDelayedTyposInExpr(E);
+if (Expr.isUsable()) E = Expr.get();
+}
+}
+return SawError;
+}
+/// ParseSimpleExpressionList - A simple comma-separated list of expressions,
+/// used for misc language extensions.
+///
+/// \verbatim
+///       simple-expression-list:
+///         assignment-expression
+///         simple-expression-list , assignment-expression
+/// \endverbatim
+bool
+Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
+SmallVectorImpl<SourceLocation> &CommaLocs) {
+while (1) {
+ExprResult Expr = ParseAssignmentExpression();
+if (Expr.isInvalid())
+return true;
+Exprs.push_back(Expr.get());
+if (Tok.isNot(tok::comma))
+return false;
+// Move to the next argument, remember where the comma was.
+Token Comma = Tok;
+CommaLocs.push_back(ConsumeToken());
+checkPotentialAngleBracketDelimiter(Comma);
+}
+}
+/// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
+///
+/// \verbatim
+/// [clang] block-id:
+/// [clang]   specifier-qualifier-list block-declarator
+/// \endverbatim
+void Parser::ParseBlockId(SourceLocation CaretLoc) {
+if (Tok.is(tok::code_completion)) {
+Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
+return cutOffParsing();
+}
+// Parse the specifier-qualifier-list piece.
+DeclSpec DS(AttrFactory);
+ParseSpecifierQualifierList(DS);
+// Parse the block-declarator.
+Declarator DeclaratorInfo(DS, DeclaratorContext::BlockLiteralContext);
+DeclaratorInfo.setFunctionDefinitionKind(FDK_Definition);
+ParseDeclarator(DeclaratorInfo);
+MaybeParseGNUAttributes(DeclaratorInfo);
+// Inform sema that we are starting a block.
+Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
+}
+/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
+/// like ^(int x){ return x+1; }
+///
+/// \verbatim
+///         block-literal:
+/// [clang]   '^' block-args[opt] compound-statement
+/// [clang]   '^' block-id compound-statement
+/// [clang] block-args:
+/// [clang]   '(' parameter-list ')'
+/// \endverbatim
+ExprResult Parser::ParseBlockLiteralExpression() {
+assert(Tok.is(tok::caret) && "block literal starts with ^");
+SourceLocation CaretLoc = ConsumeToken();
+PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
+"block literal parsing");
+// Enter a scope to hold everything within the block.  This includes the
+// argument decls, decls within the compound expression, etc.  This also
+// allows determining whether a variable reference inside the block is
+// within or outside of the block.
+ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
+Scope::CompoundStmtScope | Scope::DeclScope);
+// Inform sema that we are starting a block.
+Actions.ActOnBlockStart(CaretLoc, getCurScope());
+// Parse the return type if present.
+DeclSpec DS(AttrFactory);
+Declarator ParamInfo(DS, DeclaratorContext::BlockLiteralContext);
+ParamInfo.setFunctionDefinitionKind(FDK_Definition);
+// FIXME: Since the return type isn't actually parsed, it can't be used to
+// fill ParamInfo with an initial valid range, so do it manually.
+ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
+// If this block has arguments, parse them.  There is no ambiguity here with
+// the expression case, because the expression case requires a parameter list.
+if (Tok.is(tok::l_paren)) {
+ParseParenDeclarator(ParamInfo);
+// Parse the pieces after the identifier as if we had "int(...)".
+// SetIdentifier sets the source range end, but in this case we're past
+// that location.
+SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
+ParamInfo.SetIdentifier(nullptr, CaretLoc);
+ParamInfo.SetRangeEnd(Tmp);
+if (ParamInfo.isInvalidType()) {
+// If there was an error parsing the arguments, they may have
+// tried to use ^(x+y) which requires an argument list.  Just
+// skip the whole block literal.
+Actions.ActOnBlockError(CaretLoc, getCurScope());
+return ExprError();
+}
+MaybeParseGNUAttributes(ParamInfo);
+// Inform sema that we are starting a block.
+Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
+} else if (!Tok.is(tok::l_brace)) {
+ParseBlockId(CaretLoc);
+} else {
+// Otherwise, pretend we saw (void).
+SourceLocation NoLoc;
+ParamInfo.AddTypeInfo(
+DeclaratorChunk::getFunction(/*HasProto=*/true,
+/*IsAmbiguous=*/false,
+/*RParenLoc=*/NoLoc,
+/*ArgInfo=*/nullptr,
+/*NumParams=*/0,
+/*EllipsisLoc=*/NoLoc,
+/*RParenLoc=*/NoLoc,
+/*RefQualifierIsLvalueRef=*/true,
+/*RefQualifierLoc=*/NoLoc,
+/*MutableLoc=*/NoLoc, EST_None,
+/*ESpecRange=*/SourceRange(),
+/*Exceptions=*/nullptr,
+/*ExceptionRanges=*/nullptr,
+/*NumExceptions=*/0,
+/*NoexceptExpr=*/nullptr,
+/*ExceptionSpecTokens=*/nullptr,
+/*DeclsInPrototype=*/None, CaretLoc,
+CaretLoc, ParamInfo),
+CaretLoc);
+MaybeParseGNUAttributes(ParamInfo);
+// Inform sema that we are starting a block.
+Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
+}
+ExprResult Result(true);
+if (!Tok.is(tok::l_brace)) {
+// Saw something like: ^expr
+Diag(Tok, diag::err_expected_expression);
+Actions.ActOnBlockError(CaretLoc, getCurScope());
+return ExprError();
+}
+StmtResult Stmt(ParseCompoundStatementBody());
+BlockScope.Exit();
+if (!Stmt.isInvalid())
+Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.get(), getCurScope());
+else
+Actions.ActOnBlockError(CaretLoc, getCurScope());
+return Result;
+}
+/// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
+///
+///         '__objc_yes'
+///         '__objc_no'
+ExprResult Parser::ParseObjCBoolLiteral() {
+tok::TokenKind Kind = Tok.getKind();
+return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);
+}
+/// Validate availability spec list, emitting diagnostics if necessary. Returns
+/// true if invalid.
+static bool CheckAvailabilitySpecList(Parser &P,
+ArrayRef<AvailabilitySpec> AvailSpecs) {
+llvm::SmallSet<StringRef, 4> Platforms;
+bool HasOtherPlatformSpec = false;
+bool Valid = true;
+for (const auto &Spec : AvailSpecs) {
+if (Spec.isOtherPlatformSpec()) {
+if (HasOtherPlatformSpec) {
+P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_star);
+Valid = false;
+}
+HasOtherPlatformSpec = true;
+continue;
+}
+bool Inserted = Platforms.insert(Spec.getPlatform()).second;
+if (!Inserted) {
+// Rule out multiple version specs referring to the same platform.
+// For example, we emit an error for:
+// @available(macos 10.10, macos 10.11, *)
+StringRef Platform = Spec.getPlatform();
+P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_platform)
+<< Spec.getEndLoc() << Platform;
+Valid = false;
+}
+}
+if (!HasOtherPlatformSpec) {
+SourceLocation InsertWildcardLoc = AvailSpecs.back().getEndLoc();
+P.Diag(InsertWildcardLoc, diag::err_availability_query_wildcard_required)
+<< FixItHint::CreateInsertion(InsertWildcardLoc, ", *");
+return true;
+}
+return !Valid;
+}
+/// Parse availability query specification.
+///
+///  availability-spec:
+///     '*'
+///     identifier version-tuple
+Optional<AvailabilitySpec> Parser::ParseAvailabilitySpec() {
+if (Tok.is(tok::star)) {
+return AvailabilitySpec(ConsumeToken());
+} else {
+// Parse the platform name.
+if (Tok.is(tok::code_completion)) {
+Actions.CodeCompleteAvailabilityPlatformName();
+cutOffParsing();
+return None;
+}
+if (Tok.isNot(tok::identifier)) {
+Diag(Tok, diag::err_avail_query_expected_platform_name);
+return None;
+}
+IdentifierLoc *PlatformIdentifier = ParseIdentifierLoc();
+SourceRange VersionRange;
+VersionTuple Version = ParseVersionTuple(VersionRange);
+if (Version.empty())
+return None;
+StringRef GivenPlatform = PlatformIdentifier->Ident->getName();
+StringRef Platform =
+AvailabilityAttr::canonicalizePlatformName(GivenPlatform);
+if (AvailabilityAttr::getPrettyPlatformName(Platform).empty()) {
+Diag(PlatformIdentifier->Loc,
+diag::err_avail_query_unrecognized_platform_name)
+<< GivenPlatform;
+return None;
+}
+return AvailabilitySpec(Version, Platform, PlatformIdentifier->Loc,
+VersionRange.getEnd());
+}
+}
+ExprResult Parser::ParseAvailabilityCheckExpr(SourceLocation BeginLoc) {
+assert(Tok.is(tok::kw___builtin_available) ||
+Tok.isObjCAtKeyword(tok::objc_available));
+// Eat the available or __builtin_available.
+ConsumeToken();
+BalancedDelimiterTracker Parens(*this, tok::l_paren);
+if (Parens.expectAndConsume())
+return ExprError();
+SmallVector<AvailabilitySpec, 4> AvailSpecs;
+bool HasError = false;
+while (true) {
+Optional<AvailabilitySpec> Spec = ParseAvailabilitySpec();
+if (!Spec)
+HasError = true;
+else
+AvailSpecs.push_back(*Spec);
+if (!TryConsumeToken(tok::comma))
+break;
+}
+if (HasError) {
+SkipUntil(tok::r_paren, StopAtSemi);
+return ExprError();
+}
+CheckAvailabilitySpecList(*this, AvailSpecs);
+if (Parens.consumeClose())
+return ExprError();
+return Actions.ActOnObjCAvailabilityCheckExpr(AvailSpecs, BeginLoc,
+Parens.getCloseLocation());
+}

Mercurial > hg > CbC > CbC_llvm

comparison clang/lib/Parse/ParseExpr.cpp @ 150:1d019706d866