Bug Summary

File:clang/lib/Parse/ParseExpr.cpp
Warning:line 923, column 11
Value stored to 'ParenExprType' is never read

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ParseExpr.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Parse -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Parse -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-01-13-084841-49055-1 -x c++ /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp
1//===--- ParseExpr.cpp - Expression Parsing -------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// Provides the Expression parsing implementation.
11///
12/// Expressions in C99 basically consist of a bunch of binary operators with
13/// unary operators and other random stuff at the leaves.
14///
15/// In the C99 grammar, these unary operators bind tightest and are represented
16/// as the 'cast-expression' production. Everything else is either a binary
17/// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are
18/// handled by ParseCastExpression, the higher level pieces are handled by
19/// ParseBinaryExpression.
20///
21//===----------------------------------------------------------------------===//
22
23#include "clang/Parse/Parser.h"
24#include "clang/AST/ASTContext.h"
25#include "clang/AST/ExprCXX.h"
26#include "clang/Basic/PrettyStackTrace.h"
27#include "clang/Parse/RAIIObjectsForParser.h"
28#include "clang/Sema/DeclSpec.h"
29#include "clang/Sema/ParsedTemplate.h"
30#include "clang/Sema/Scope.h"
31#include "clang/Sema/TypoCorrection.h"
32#include "llvm/ADT/SmallVector.h"
33using namespace clang;
34
35/// Simple precedence-based parser for binary/ternary operators.
36///
37/// Note: we diverge from the C99 grammar when parsing the assignment-expression
38/// production. C99 specifies that the LHS of an assignment operator should be
39/// parsed as a unary-expression, but consistency dictates that it be a
40/// conditional-expession. In practice, the important thing here is that the
41/// LHS of an assignment has to be an l-value, which productions between
42/// unary-expression and conditional-expression don't produce. Because we want
43/// consistency, we parse the LHS as a conditional-expression, then check for
44/// l-value-ness in semantic analysis stages.
45///
46/// \verbatim
47/// pm-expression: [C++ 5.5]
48/// cast-expression
49/// pm-expression '.*' cast-expression
50/// pm-expression '->*' cast-expression
51///
52/// multiplicative-expression: [C99 6.5.5]
53/// Note: in C++, apply pm-expression instead of cast-expression
54/// cast-expression
55/// multiplicative-expression '*' cast-expression
56/// multiplicative-expression '/' cast-expression
57/// multiplicative-expression '%' cast-expression
58///
59/// additive-expression: [C99 6.5.6]
60/// multiplicative-expression
61/// additive-expression '+' multiplicative-expression
62/// additive-expression '-' multiplicative-expression
63///
64/// shift-expression: [C99 6.5.7]
65/// additive-expression
66/// shift-expression '<<' additive-expression
67/// shift-expression '>>' additive-expression
68///
69/// compare-expression: [C++20 expr.spaceship]
70/// shift-expression
71/// compare-expression '<=>' shift-expression
72///
73/// relational-expression: [C99 6.5.8]
74/// compare-expression
75/// relational-expression '<' compare-expression
76/// relational-expression '>' compare-expression
77/// relational-expression '<=' compare-expression
78/// relational-expression '>=' compare-expression
79///
80/// equality-expression: [C99 6.5.9]
81/// relational-expression
82/// equality-expression '==' relational-expression
83/// equality-expression '!=' relational-expression
84///
85/// AND-expression: [C99 6.5.10]
86/// equality-expression
87/// AND-expression '&' equality-expression
88///
89/// exclusive-OR-expression: [C99 6.5.11]
90/// AND-expression
91/// exclusive-OR-expression '^' AND-expression
92///
93/// inclusive-OR-expression: [C99 6.5.12]
94/// exclusive-OR-expression
95/// inclusive-OR-expression '|' exclusive-OR-expression
96///
97/// logical-AND-expression: [C99 6.5.13]
98/// inclusive-OR-expression
99/// logical-AND-expression '&&' inclusive-OR-expression
100///
101/// logical-OR-expression: [C99 6.5.14]
102/// logical-AND-expression
103/// logical-OR-expression '||' logical-AND-expression
104///
105/// conditional-expression: [C99 6.5.15]
106/// logical-OR-expression
107/// logical-OR-expression '?' expression ':' conditional-expression
108/// [GNU] logical-OR-expression '?' ':' conditional-expression
109/// [C++] the third operand is an assignment-expression
110///
111/// assignment-expression: [C99 6.5.16]
112/// conditional-expression
113/// unary-expression assignment-operator assignment-expression
114/// [C++] throw-expression [C++ 15]
115///
116/// assignment-operator: one of
117/// = *= /= %= += -= <<= >>= &= ^= |=
118///
119/// expression: [C99 6.5.17]
120/// assignment-expression ...[opt]
121/// expression ',' assignment-expression ...[opt]
122/// \endverbatim
123ExprResult Parser::ParseExpression(TypeCastState isTypeCast) {
124 ExprResult LHS(ParseAssignmentExpression(isTypeCast));
125 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
126}
127
128/// This routine is called when the '@' is seen and consumed.
129/// Current token is an Identifier and is not a 'try'. This
130/// routine is necessary to disambiguate \@try-statement from,
131/// for example, \@encode-expression.
132///
133ExprResult
134Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) {
135 ExprResult LHS(ParseObjCAtExpression(AtLoc));
136 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
137}
138
139/// This routine is called when a leading '__extension__' is seen and
140/// consumed. This is necessary because the token gets consumed in the
141/// process of disambiguating between an expression and a declaration.
142ExprResult
143Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
144 ExprResult LHS(true);
145 {
146 // Silence extension warnings in the sub-expression
147 ExtensionRAIIObject O(Diags);
148
149 LHS = ParseCastExpression(AnyCastExpr);
150 }
151
152 if (!LHS.isInvalid())
153 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__,
154 LHS.get());
155
156 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
157}
158
159/// Parse an expr that doesn't include (top-level) commas.
160ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) {
161 if (Tok.is(tok::code_completion)) {
162 Actions.CodeCompleteExpression(getCurScope(),
163 PreferredType.get(Tok.getLocation()));
164 cutOffParsing();
165 return ExprError();
166 }
167
168 if (Tok.is(tok::kw_throw))
169 return ParseThrowExpression();
170 if (Tok.is(tok::kw_co_yield))
171 return ParseCoyieldExpression();
172
173 ExprResult LHS = ParseCastExpression(AnyCastExpr,
174 /*isAddressOfOperand=*/false,
175 isTypeCast);
176 return ParseRHSOfBinaryExpression(LHS, prec::Assignment);
177}
178
179/// Parse an assignment expression where part of an Objective-C message
180/// send has already been parsed.
181///
182/// In this case \p LBracLoc indicates the location of the '[' of the message
183/// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating
184/// the receiver of the message.
185///
186/// Since this handles full assignment-expression's, it handles postfix
187/// expressions and other binary operators for these expressions as well.
188ExprResult
189Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
190 SourceLocation SuperLoc,
191 ParsedType ReceiverType,
192 Expr *ReceiverExpr) {
193 ExprResult R
194 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc,
195 ReceiverType, ReceiverExpr);
196 R = ParsePostfixExpressionSuffix(R);
197 return ParseRHSOfBinaryExpression(R, prec::Assignment);
198}
199
200ExprResult
201Parser::ParseConstantExpressionInExprEvalContext(TypeCastState isTypeCast) {
202 assert(Actions.ExprEvalContexts.back().Context ==((Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext
::ConstantEvaluated && "Call this function only if your ExpressionEvaluationContext is "
"already ConstantEvaluated") ? static_cast<void> (0) :
__assert_fail ("Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext::ConstantEvaluated && \"Call this function only if your ExpressionEvaluationContext is \" \"already ConstantEvaluated\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 205, __PRETTY_FUNCTION__))
203 Sema::ExpressionEvaluationContext::ConstantEvaluated &&((Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext
::ConstantEvaluated && "Call this function only if your ExpressionEvaluationContext is "
"already ConstantEvaluated") ? static_cast<void> (0) :
__assert_fail ("Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext::ConstantEvaluated && \"Call this function only if your ExpressionEvaluationContext is \" \"already ConstantEvaluated\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 205, __PRETTY_FUNCTION__))
204 "Call this function only if your ExpressionEvaluationContext is "((Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext
::ConstantEvaluated && "Call this function only if your ExpressionEvaluationContext is "
"already ConstantEvaluated") ? static_cast<void> (0) :
__assert_fail ("Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext::ConstantEvaluated && \"Call this function only if your ExpressionEvaluationContext is \" \"already ConstantEvaluated\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 205, __PRETTY_FUNCTION__))
205 "already ConstantEvaluated")((Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext
::ConstantEvaluated && "Call this function only if your ExpressionEvaluationContext is "
"already ConstantEvaluated") ? static_cast<void> (0) :
__assert_fail ("Actions.ExprEvalContexts.back().Context == Sema::ExpressionEvaluationContext::ConstantEvaluated && \"Call this function only if your ExpressionEvaluationContext is \" \"already ConstantEvaluated\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 205, __PRETTY_FUNCTION__))
;
206 ExprResult LHS(ParseCastExpression(AnyCastExpr, false, isTypeCast));
207 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
208 return Actions.ActOnConstantExpression(Res);
209}
210
211ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) {
212 // C++03 [basic.def.odr]p2:
213 // An expression is potentially evaluated unless it appears where an
214 // integral constant expression is required (see 5.19) [...].
215 // C++98 and C++11 have no such rule, but this is only a defect in C++98.
216 EnterExpressionEvaluationContext ConstantEvaluated(
217 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
218 return ParseConstantExpressionInExprEvalContext(isTypeCast);
219}
220
221ExprResult Parser::ParseCaseExpression(SourceLocation CaseLoc) {
222 EnterExpressionEvaluationContext ConstantEvaluated(
223 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
224 ExprResult LHS(ParseCastExpression(AnyCastExpr, false, NotTypeCast));
225 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
226 return Actions.ActOnCaseExpr(CaseLoc, Res);
227}
228
229/// Parse a constraint-expression.
230///
231/// \verbatim
232/// constraint-expression: C++2a[temp.constr.decl]p1
233/// logical-or-expression
234/// \endverbatim
235ExprResult Parser::ParseConstraintExpression() {
236 EnterExpressionEvaluationContext ConstantEvaluated(
237 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
238 ExprResult LHS(ParseCastExpression(AnyCastExpr));
239 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::LogicalOr));
240 if (Res.isUsable() && !Actions.CheckConstraintExpression(Res.get())) {
241 Actions.CorrectDelayedTyposInExpr(Res);
242 return ExprError();
243 }
244 return Res;
245}
246
247/// \brief Parse a constraint-logical-and-expression.
248///
249/// \verbatim
250/// C++2a[temp.constr.decl]p1
251/// constraint-logical-and-expression:
252/// primary-expression
253/// constraint-logical-and-expression '&&' primary-expression
254///
255/// \endverbatim
256ExprResult
257Parser::ParseConstraintLogicalAndExpression(bool IsTrailingRequiresClause) {
258 EnterExpressionEvaluationContext ConstantEvaluated(
259 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
260 bool NotPrimaryExpression = false;
261 auto ParsePrimary = [&] () {
262 ExprResult E = ParseCastExpression(PrimaryExprOnly,
263 /*isAddressOfOperand=*/false,
264 /*isTypeCast=*/NotTypeCast,
265 /*isVectorLiteral=*/false,
266 &NotPrimaryExpression);
267 if (E.isInvalid())
268 return ExprError();
269 auto RecoverFromNonPrimary = [&] (ExprResult E, bool Note) {
270 E = ParsePostfixExpressionSuffix(E);
271 // Use InclusiveOr, the precedence just after '&&' to not parse the
272 // next arguments to the logical and.
273 E = ParseRHSOfBinaryExpression(E, prec::InclusiveOr);
274 if (!E.isInvalid())
275 Diag(E.get()->getExprLoc(),
276 Note
277 ? diag::note_unparenthesized_non_primary_expr_in_requires_clause
278 : diag::err_unparenthesized_non_primary_expr_in_requires_clause)
279 << FixItHint::CreateInsertion(E.get()->getBeginLoc(), "(")
280 << FixItHint::CreateInsertion(
281 PP.getLocForEndOfToken(E.get()->getEndLoc()), ")")
282 << E.get()->getSourceRange();
283 return E;
284 };
285
286 if (NotPrimaryExpression ||
287 // Check if the following tokens must be a part of a non-primary
288 // expression
289 getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
290 /*CPlusPlus11=*/true) > prec::LogicalAnd ||
291 // Postfix operators other than '(' (which will be checked for in
292 // CheckConstraintExpression).
293 Tok.isOneOf(tok::period, tok::plusplus, tok::minusminus) ||
294 (Tok.is(tok::l_square) && !NextToken().is(tok::l_square))) {
295 E = RecoverFromNonPrimary(E, /*Note=*/false);
296 if (E.isInvalid())
297 return ExprError();
298 NotPrimaryExpression = false;
299 }
300 bool PossibleNonPrimary;
301 bool IsConstraintExpr =
302 Actions.CheckConstraintExpression(E.get(), Tok, &PossibleNonPrimary,
303 IsTrailingRequiresClause);
304 if (!IsConstraintExpr || PossibleNonPrimary) {
305 // Atomic constraint might be an unparenthesized non-primary expression
306 // (such as a binary operator), in which case we might get here (e.g. in
307 // 'requires 0 + 1 && true' we would now be at '+', and parse and ignore
308 // the rest of the addition expression). Try to parse the rest of it here.
309 if (PossibleNonPrimary)
310 E = RecoverFromNonPrimary(E, /*Note=*/!IsConstraintExpr);
311 Actions.CorrectDelayedTyposInExpr(E);
312 return ExprError();
313 }
314 return E;
315 };
316 ExprResult LHS = ParsePrimary();
317 if (LHS.isInvalid())
318 return ExprError();
319 while (Tok.is(tok::ampamp)) {
320 SourceLocation LogicalAndLoc = ConsumeToken();
321 ExprResult RHS = ParsePrimary();
322 if (RHS.isInvalid()) {
323 Actions.CorrectDelayedTyposInExpr(LHS);
324 return ExprError();
325 }
326 ExprResult Op = Actions.ActOnBinOp(getCurScope(), LogicalAndLoc,
327 tok::ampamp, LHS.get(), RHS.get());
328 if (!Op.isUsable()) {
329 Actions.CorrectDelayedTyposInExpr(RHS);
330 Actions.CorrectDelayedTyposInExpr(LHS);
331 return ExprError();
332 }
333 LHS = Op;
334 }
335 return LHS;
336}
337
338/// \brief Parse a constraint-logical-or-expression.
339///
340/// \verbatim
341/// C++2a[temp.constr.decl]p1
342/// constraint-logical-or-expression:
343/// constraint-logical-and-expression
344/// constraint-logical-or-expression '||'
345/// constraint-logical-and-expression
346///
347/// \endverbatim
348ExprResult
349Parser::ParseConstraintLogicalOrExpression(bool IsTrailingRequiresClause) {
350 ExprResult LHS(ParseConstraintLogicalAndExpression(IsTrailingRequiresClause));
351 if (!LHS.isUsable())
352 return ExprError();
353 while (Tok.is(tok::pipepipe)) {
354 SourceLocation LogicalOrLoc = ConsumeToken();
355 ExprResult RHS =
356 ParseConstraintLogicalAndExpression(IsTrailingRequiresClause);
357 if (!RHS.isUsable()) {
358 Actions.CorrectDelayedTyposInExpr(LHS);
359 return ExprError();
360 }
361 ExprResult Op = Actions.ActOnBinOp(getCurScope(), LogicalOrLoc,
362 tok::pipepipe, LHS.get(), RHS.get());
363 if (!Op.isUsable()) {
364 Actions.CorrectDelayedTyposInExpr(RHS);
365 Actions.CorrectDelayedTyposInExpr(LHS);
366 return ExprError();
367 }
368 LHS = Op;
369 }
370 return LHS;
371}
372
373bool Parser::isNotExpressionStart() {
374 tok::TokenKind K = Tok.getKind();
375 if (K == tok::l_brace || K == tok::r_brace ||
376 K == tok::kw_for || K == tok::kw_while ||
377 K == tok::kw_if || K == tok::kw_else ||
378 K == tok::kw_goto || K == tok::kw_try)
379 return true;
380 // If this is a decl-specifier, we can't be at the start of an expression.
381 return isKnownToBeDeclarationSpecifier();
382}
383
384bool Parser::isFoldOperator(prec::Level Level) const {
385 return Level > prec::Unknown && Level != prec::Conditional &&
386 Level != prec::Spaceship;
387}
388
389bool Parser::isFoldOperator(tok::TokenKind Kind) const {
390 return isFoldOperator(getBinOpPrecedence(Kind, GreaterThanIsOperator, true));
391}
392
393/// Parse a binary expression that starts with \p LHS and has a
394/// precedence of at least \p MinPrec.
395ExprResult
396Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
397 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(),
398 GreaterThanIsOperator,
399 getLangOpts().CPlusPlus11);
400 SourceLocation ColonLoc;
401
402 auto SavedType = PreferredType;
403 while (1) {
404 // Every iteration may rely on a preferred type for the whole expression.
405 PreferredType = SavedType;
406 // If this token has a lower precedence than we are allowed to parse (e.g.
407 // because we are called recursively, or because the token is not a binop),
408 // then we are done!
409 if (NextTokPrec < MinPrec)
410 return LHS;
411
412 // Consume the operator, saving the operator token for error reporting.
413 Token OpToken = Tok;
414 ConsumeToken();
415
416 if (OpToken.is(tok::caretcaret)) {
417 return ExprError(Diag(Tok, diag::err_opencl_logical_exclusive_or));
418 }
419
420 // If we're potentially in a template-id, we may now be able to determine
421 // whether we're actually in one or not.
422 if (OpToken.isOneOf(tok::comma, tok::greater, tok::greatergreater,
423 tok::greatergreatergreater) &&
424 checkPotentialAngleBracketDelimiter(OpToken))
425 return ExprError();
426
427 // Bail out when encountering a comma followed by a token which can't
428 // possibly be the start of an expression. For instance:
429 // int f() { return 1, }
430 // We can't do this before consuming the comma, because
431 // isNotExpressionStart() looks at the token stream.
432 if (OpToken.is(tok::comma) && isNotExpressionStart()) {
433 PP.EnterToken(Tok, /*IsReinject*/true);
434 Tok = OpToken;
435 return LHS;
436 }
437
438 // If the next token is an ellipsis, then this is a fold-expression. Leave
439 // it alone so we can handle it in the paren expression.
440 if (isFoldOperator(NextTokPrec) && Tok.is(tok::ellipsis)) {
441 // FIXME: We can't check this via lookahead before we consume the token
442 // because that tickles a lexer bug.
443 PP.EnterToken(Tok, /*IsReinject*/true);
444 Tok = OpToken;
445 return LHS;
446 }
447
448 // In Objective-C++, alternative operator tokens can be used as keyword args
449 // in message expressions. Unconsume the token so that it can reinterpreted
450 // as an identifier in ParseObjCMessageExpressionBody. i.e., we support:
451 // [foo meth:0 and:0];
452 // [foo not_eq];
453 if (getLangOpts().ObjC && getLangOpts().CPlusPlus &&
454 Tok.isOneOf(tok::colon, tok::r_square) &&
455 OpToken.getIdentifierInfo() != nullptr) {
456 PP.EnterToken(Tok, /*IsReinject*/true);
457 Tok = OpToken;
458 return LHS;
459 }
460
461 // Special case handling for the ternary operator.
462 ExprResult TernaryMiddle(true);
463 if (NextTokPrec == prec::Conditional) {
464 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
465 // Parse a braced-init-list here for error recovery purposes.
466 SourceLocation BraceLoc = Tok.getLocation();
467 TernaryMiddle = ParseBraceInitializer();
468 if (!TernaryMiddle.isInvalid()) {
469 Diag(BraceLoc, diag::err_init_list_bin_op)
470 << /*RHS*/ 1 << PP.getSpelling(OpToken)
471 << Actions.getExprRange(TernaryMiddle.get());
472 TernaryMiddle = ExprError();
473 }
474 } else if (Tok.isNot(tok::colon)) {
475 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
476 ColonProtectionRAIIObject X(*this);
477
478 // Handle this production specially:
479 // logical-OR-expression '?' expression ':' conditional-expression
480 // In particular, the RHS of the '?' is 'expression', not
481 // 'logical-OR-expression' as we might expect.
482 TernaryMiddle = ParseExpression();
483 } else {
484 // Special case handling of "X ? Y : Z" where Y is empty:
485 // logical-OR-expression '?' ':' conditional-expression [GNU]
486 TernaryMiddle = nullptr;
487 Diag(Tok, diag::ext_gnu_conditional_expr);
488 }
489
490 if (TernaryMiddle.isInvalid()) {
491 Actions.CorrectDelayedTyposInExpr(LHS);
492 LHS = ExprError();
493 TernaryMiddle = nullptr;
494 }
495
496 if (!TryConsumeToken(tok::colon, ColonLoc)) {
497 // Otherwise, we're missing a ':'. Assume that this was a typo that
498 // the user forgot. If we're not in a macro expansion, we can suggest
499 // a fixit hint. If there were two spaces before the current token,
500 // suggest inserting the colon in between them, otherwise insert ": ".
501 SourceLocation FILoc = Tok.getLocation();
502 const char *FIText = ": ";
503 const SourceManager &SM = PP.getSourceManager();
504 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) {
505 assert(FILoc.isFileID())((FILoc.isFileID()) ? static_cast<void> (0) : __assert_fail
("FILoc.isFileID()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 505, __PRETTY_FUNCTION__))
;
506 bool IsInvalid = false;
507 const char *SourcePtr =
508 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid);
509 if (!IsInvalid && *SourcePtr == ' ') {
510 SourcePtr =
511 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid);
512 if (!IsInvalid && *SourcePtr == ' ') {
513 FILoc = FILoc.getLocWithOffset(-1);
514 FIText = ":";
515 }
516 }
517 }
518
519 Diag(Tok, diag::err_expected)
520 << tok::colon << FixItHint::CreateInsertion(FILoc, FIText);
521 Diag(OpToken, diag::note_matching) << tok::question;
522 ColonLoc = Tok.getLocation();
523 }
524 }
525
526 PreferredType.enterBinary(Actions, Tok.getLocation(), LHS.get(),
527 OpToken.getKind());
528 // Parse another leaf here for the RHS of the operator.
529 // ParseCastExpression works here because all RHS expressions in C have it
530 // as a prefix, at least. However, in C++, an assignment-expression could
531 // be a throw-expression, which is not a valid cast-expression.
532 // Therefore we need some special-casing here.
533 // Also note that the third operand of the conditional operator is
534 // an assignment-expression in C++, and in C++11, we can have a
535 // braced-init-list on the RHS of an assignment. For better diagnostics,
536 // parse as if we were allowed braced-init-lists everywhere, and check that
537 // they only appear on the RHS of assignments later.
538 ExprResult RHS;
539 bool RHSIsInitList = false;
540 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
541 RHS = ParseBraceInitializer();
542 RHSIsInitList = true;
543 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional)
544 RHS = ParseAssignmentExpression();
545 else
546 RHS = ParseCastExpression(AnyCastExpr);
547
548 if (RHS.isInvalid()) {
549 // FIXME: Errors generated by the delayed typo correction should be
550 // printed before errors from parsing the RHS, not after.
551 Actions.CorrectDelayedTyposInExpr(LHS);
552 if (TernaryMiddle.isUsable())
553 TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
554 LHS = ExprError();
555 }
556
557 // Remember the precedence of this operator and get the precedence of the
558 // operator immediately to the right of the RHS.
559 prec::Level ThisPrec = NextTokPrec;
560 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
561 getLangOpts().CPlusPlus11);
562
563 // Assignment and conditional expressions are right-associative.
564 bool isRightAssoc = ThisPrec == prec::Conditional ||
565 ThisPrec == prec::Assignment;
566
567 // Get the precedence of the operator to the right of the RHS. If it binds
568 // more tightly with RHS than we do, evaluate it completely first.
569 if (ThisPrec < NextTokPrec ||
570 (ThisPrec == NextTokPrec && isRightAssoc)) {
571 if (!RHS.isInvalid() && RHSIsInitList) {
572 Diag(Tok, diag::err_init_list_bin_op)
573 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get());
574 RHS = ExprError();
575 }
576 // If this is left-associative, only parse things on the RHS that bind
577 // more tightly than the current operator. If it is left-associative, it
578 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as
579 // A=(B=(C=D)), where each paren is a level of recursion here.
580 // The function takes ownership of the RHS.
581 RHS = ParseRHSOfBinaryExpression(RHS,
582 static_cast<prec::Level>(ThisPrec + !isRightAssoc));
583 RHSIsInitList = false;
584
585 if (RHS.isInvalid()) {
586 // FIXME: Errors generated by the delayed typo correction should be
587 // printed before errors from ParseRHSOfBinaryExpression, not after.
588 Actions.CorrectDelayedTyposInExpr(LHS);
589 if (TernaryMiddle.isUsable())
590 TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
591 LHS = ExprError();
592 }
593
594 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
595 getLangOpts().CPlusPlus11);
596 }
597
598 if (!RHS.isInvalid() && RHSIsInitList) {
599 if (ThisPrec == prec::Assignment) {
600 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists)
601 << Actions.getExprRange(RHS.get());
602 } else if (ColonLoc.isValid()) {
603 Diag(ColonLoc, diag::err_init_list_bin_op)
604 << /*RHS*/1 << ":"
605 << Actions.getExprRange(RHS.get());
606 LHS = ExprError();
607 } else {
608 Diag(OpToken, diag::err_init_list_bin_op)
609 << /*RHS*/1 << PP.getSpelling(OpToken)
610 << Actions.getExprRange(RHS.get());
611 LHS = ExprError();
612 }
613 }
614
615 ExprResult OrigLHS = LHS;
616 if (!LHS.isInvalid()) {
617 // Combine the LHS and RHS into the LHS (e.g. build AST).
618 if (TernaryMiddle.isInvalid()) {
619 // If we're using '>>' as an operator within a template
620 // argument list (in C++98), suggest the addition of
621 // parentheses so that the code remains well-formed in C++0x.
622 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater))
623 SuggestParentheses(OpToken.getLocation(),
624 diag::warn_cxx11_right_shift_in_template_arg,
625 SourceRange(Actions.getExprRange(LHS.get()).getBegin(),
626 Actions.getExprRange(RHS.get()).getEnd()));
627
628 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(),
629 OpToken.getKind(), LHS.get(), RHS.get());
630
631 } else {
632 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
633 LHS.get(), TernaryMiddle.get(),
634 RHS.get());
635 }
636 // In this case, ActOnBinOp or ActOnConditionalOp performed the
637 // CorrectDelayedTyposInExpr check.
638 if (!getLangOpts().CPlusPlus)
639 continue;
640 }
641
642 // Ensure potential typos aren't left undiagnosed.
643 if (LHS.isInvalid()) {
644 Actions.CorrectDelayedTyposInExpr(OrigLHS);
645 Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
646 Actions.CorrectDelayedTyposInExpr(RHS);
647 }
648 }
649}
650
651/// Parse a cast-expression, unary-expression or primary-expression, based
652/// on \p ExprType.
653///
654/// \p isAddressOfOperand exists because an id-expression that is the
655/// operand of address-of gets special treatment due to member pointers.
656///
657ExprResult Parser::ParseCastExpression(CastParseKind ParseKind,
658 bool isAddressOfOperand,
659 TypeCastState isTypeCast,
660 bool isVectorLiteral,
661 bool *NotPrimaryExpression) {
662 bool NotCastExpr;
663 ExprResult Res = ParseCastExpression(ParseKind,
664 isAddressOfOperand,
665 NotCastExpr,
666 isTypeCast,
667 isVectorLiteral,
668 NotPrimaryExpression);
669 if (NotCastExpr)
670 Diag(Tok, diag::err_expected_expression);
671 return Res;
672}
673
674namespace {
675class CastExpressionIdValidator final : public CorrectionCandidateCallback {
676 public:
677 CastExpressionIdValidator(Token Next, bool AllowTypes, bool AllowNonTypes)
678 : NextToken(Next), AllowNonTypes(AllowNonTypes) {
679 WantTypeSpecifiers = WantFunctionLikeCasts = AllowTypes;
680 }
681
682 bool ValidateCandidate(const TypoCorrection &candidate) override {
683 NamedDecl *ND = candidate.getCorrectionDecl();
684 if (!ND)
685 return candidate.isKeyword();
686
687 if (isa<TypeDecl>(ND))
688 return WantTypeSpecifiers;
689
690 if (!AllowNonTypes || !CorrectionCandidateCallback::ValidateCandidate(candidate))
691 return false;
692
693 if (!NextToken.isOneOf(tok::equal, tok::arrow, tok::period))
694 return true;
695
696 for (auto *C : candidate) {
697 NamedDecl *ND = C->getUnderlyingDecl();
698 if (isa<ValueDecl>(ND) && !isa<FunctionDecl>(ND))
699 return true;
700 }
701 return false;
702 }
703
704 std::unique_ptr<CorrectionCandidateCallback> clone() override {
705 return std::make_unique<CastExpressionIdValidator>(*this);
706 }
707
708 private:
709 Token NextToken;
710 bool AllowNonTypes;
711};
712}
713
714/// Parse a cast-expression, or, if \pisUnaryExpression is true, parse
715/// a unary-expression.
716///
717/// \p isAddressOfOperand exists because an id-expression that is the operand
718/// of address-of gets special treatment due to member pointers. NotCastExpr
719/// is set to true if the token is not the start of a cast-expression, and no
720/// diagnostic is emitted in this case and no tokens are consumed.
721///
722/// \verbatim
723/// cast-expression: [C99 6.5.4]
724/// unary-expression
725/// '(' type-name ')' cast-expression
726///
727/// unary-expression: [C99 6.5.3]
728/// postfix-expression
729/// '++' unary-expression
730/// '--' unary-expression
731/// [Coro] 'co_await' cast-expression
732/// unary-operator cast-expression
733/// 'sizeof' unary-expression
734/// 'sizeof' '(' type-name ')'
735/// [C++11] 'sizeof' '...' '(' identifier ')'
736/// [GNU] '__alignof' unary-expression
737/// [GNU] '__alignof' '(' type-name ')'
738/// [C11] '_Alignof' '(' type-name ')'
739/// [C++11] 'alignof' '(' type-id ')'
740/// [GNU] '&&' identifier
741/// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7]
742/// [C++] new-expression
743/// [C++] delete-expression
744///
745/// unary-operator: one of
746/// '&' '*' '+' '-' '~' '!'
747/// [GNU] '__extension__' '__real' '__imag'
748///
749/// primary-expression: [C99 6.5.1]
750/// [C99] identifier
751/// [C++] id-expression
752/// constant
753/// string-literal
754/// [C++] boolean-literal [C++ 2.13.5]
755/// [C++11] 'nullptr' [C++11 2.14.7]
756/// [C++11] user-defined-literal
757/// '(' expression ')'
758/// [C11] generic-selection
759/// '__func__' [C99 6.4.2.2]
760/// [GNU] '__FUNCTION__'
761/// [MS] '__FUNCDNAME__'
762/// [MS] 'L__FUNCTION__'
763/// [MS] '__FUNCSIG__'
764/// [MS] 'L__FUNCSIG__'
765/// [GNU] '__PRETTY_FUNCTION__'
766/// [GNU] '(' compound-statement ')'
767/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
768/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
769/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
770/// assign-expr ')'
771/// [GNU] '__builtin_FILE' '(' ')'
772/// [GNU] '__builtin_FUNCTION' '(' ')'
773/// [GNU] '__builtin_LINE' '(' ')'
774/// [CLANG] '__builtin_COLUMN' '(' ')'
775/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
776/// [GNU] '__null'
777/// [OBJC] '[' objc-message-expr ']'
778/// [OBJC] '\@selector' '(' objc-selector-arg ')'
779/// [OBJC] '\@protocol' '(' identifier ')'
780/// [OBJC] '\@encode' '(' type-name ')'
781/// [OBJC] objc-string-literal
782/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
783/// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3]
784/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
785/// [C++11] typename-specifier braced-init-list [C++11 5.2.3]
786/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
787/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
788/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
789/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
790/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
791/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
792/// [C++] 'this' [C++ 9.3.2]
793/// [G++] unary-type-trait '(' type-id ')'
794/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
795/// [EMBT] array-type-trait '(' type-id ',' integer ')'
796/// [clang] '^' block-literal
797///
798/// constant: [C99 6.4.4]
799/// integer-constant
800/// floating-constant
801/// enumeration-constant -> identifier
802/// character-constant
803///
804/// id-expression: [C++ 5.1]
805/// unqualified-id
806/// qualified-id
807///
808/// unqualified-id: [C++ 5.1]
809/// identifier
810/// operator-function-id
811/// conversion-function-id
812/// '~' class-name
813/// template-id
814///
815/// new-expression: [C++ 5.3.4]
816/// '::'[opt] 'new' new-placement[opt] new-type-id
817/// new-initializer[opt]
818/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
819/// new-initializer[opt]
820///
821/// delete-expression: [C++ 5.3.5]
822/// '::'[opt] 'delete' cast-expression
823/// '::'[opt] 'delete' '[' ']' cast-expression
824///
825/// [GNU/Embarcadero] unary-type-trait:
826/// '__is_arithmetic'
827/// '__is_floating_point'
828/// '__is_integral'
829/// '__is_lvalue_expr'
830/// '__is_rvalue_expr'
831/// '__is_complete_type'
832/// '__is_void'
833/// '__is_array'
834/// '__is_function'
835/// '__is_reference'
836/// '__is_lvalue_reference'
837/// '__is_rvalue_reference'
838/// '__is_fundamental'
839/// '__is_object'
840/// '__is_scalar'
841/// '__is_compound'
842/// '__is_pointer'
843/// '__is_member_object_pointer'
844/// '__is_member_function_pointer'
845/// '__is_member_pointer'
846/// '__is_const'
847/// '__is_volatile'
848/// '__is_trivial'
849/// '__is_standard_layout'
850/// '__is_signed'
851/// '__is_unsigned'
852///
853/// [GNU] unary-type-trait:
854/// '__has_nothrow_assign'
855/// '__has_nothrow_copy'
856/// '__has_nothrow_constructor'
857/// '__has_trivial_assign' [TODO]
858/// '__has_trivial_copy' [TODO]
859/// '__has_trivial_constructor'
860/// '__has_trivial_destructor'
861/// '__has_virtual_destructor'
862/// '__is_abstract' [TODO]
863/// '__is_class'
864/// '__is_empty' [TODO]
865/// '__is_enum'
866/// '__is_final'
867/// '__is_pod'
868/// '__is_polymorphic'
869/// '__is_sealed' [MS]
870/// '__is_trivial'
871/// '__is_union'
872/// '__has_unique_object_representations'
873///
874/// [Clang] unary-type-trait:
875/// '__is_aggregate'
876/// '__trivially_copyable'
877///
878/// binary-type-trait:
879/// [GNU] '__is_base_of'
880/// [MS] '__is_convertible_to'
881/// '__is_convertible'
882/// '__is_same'
883///
884/// [Embarcadero] array-type-trait:
885/// '__array_rank'
886/// '__array_extent'
887///
888/// [Embarcadero] expression-trait:
889/// '__is_lvalue_expr'
890/// '__is_rvalue_expr'
891/// \endverbatim
892///
893ExprResult Parser::ParseCastExpression(CastParseKind ParseKind,
894 bool isAddressOfOperand,
895 bool &NotCastExpr,
896 TypeCastState isTypeCast,
897 bool isVectorLiteral,
898 bool *NotPrimaryExpression) {
899 ExprResult Res;
900 tok::TokenKind SavedKind = Tok.getKind();
901 auto SavedType = PreferredType;
902 NotCastExpr = false;
903
904 // This handles all of cast-expression, unary-expression, postfix-expression,
905 // and primary-expression. We handle them together like this for efficiency
906 // and to simplify handling of an expression starting with a '(' token: which
907 // may be one of a parenthesized expression, cast-expression, compound literal
908 // expression, or statement expression.
909 //
910 // If the parsed tokens consist of a primary-expression, the cases below
911 // break out of the switch; at the end we call ParsePostfixExpressionSuffix
912 // to handle the postfix expression suffixes. Cases that cannot be followed
913 // by postfix exprs should return without invoking
914 // ParsePostfixExpressionSuffix.
915 switch (SavedKind) {
916 case tok::l_paren: {
917 // If this expression is limited to being a unary-expression, the paren can
918 // not start a cast expression.
919 ParenParseOption ParenExprType;
920 switch (ParseKind) {
921 case CastParseKind::UnaryExprOnly:
922 if (!getLangOpts().CPlusPlus)
923 ParenExprType = CompoundLiteral;
Value stored to 'ParenExprType' is never read
924 LLVM_FALLTHROUGH[[gnu::fallthrough]];
925 case CastParseKind::AnyCastExpr:
926 ParenExprType = ParenParseOption::CastExpr;
927 break;
928 case CastParseKind::PrimaryExprOnly:
929 ParenExprType = FoldExpr;
930 break;
931 }
932 ParsedType CastTy;
933 SourceLocation RParenLoc;
934 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
935 isTypeCast == IsTypeCast, CastTy, RParenLoc);
936
937 if (isVectorLiteral)
938 return Res;
939
940 switch (ParenExprType) {
941 case SimpleExpr: break; // Nothing else to do.
942 case CompoundStmt: break; // Nothing else to do.
943 case CompoundLiteral:
944 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of
945 // postfix-expression exist, parse them now.
946 break;
947 case CastExpr:
948 // We have parsed the cast-expression and no postfix-expr pieces are
949 // following.
950 return Res;
951 case FoldExpr:
952 // We only parsed a fold-expression. There might be postfix-expr pieces
953 // afterwards; parse them now.
954 break;
955 }
956
957 break;
958 }
959
960 // primary-expression
961 case tok::numeric_constant:
962 // constant: integer-constant
963 // constant: floating-constant
964
965 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
966 ConsumeToken();
967 break;
968
969 case tok::kw_true:
970 case tok::kw_false:
971 Res = ParseCXXBoolLiteral();
972 break;
973
974 case tok::kw___objc_yes:
975 case tok::kw___objc_no:
976 return ParseObjCBoolLiteral();
977
978 case tok::kw_nullptr:
979 Diag(Tok, diag::warn_cxx98_compat_nullptr);
980 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
981
982 case tok::annot_primary_expr:
983 Res = getExprAnnotation(Tok);
984 ConsumeAnnotationToken();
985 if (!Res.isInvalid() && Tok.is(tok::less))
986 checkPotentialAngleBracket(Res);
987 break;
988
989 case tok::annot_non_type:
990 case tok::annot_non_type_dependent:
991 case tok::annot_non_type_undeclared: {
992 CXXScopeSpec SS;
993 Token Replacement;
994 Res = tryParseCXXIdExpression(SS, isAddressOfOperand, Replacement);
995 assert(!Res.isUnset() &&((!Res.isUnset() && "should not perform typo correction on annotation token"
) ? static_cast<void> (0) : __assert_fail ("!Res.isUnset() && \"should not perform typo correction on annotation token\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 996, __PRETTY_FUNCTION__))
996 "should not perform typo correction on annotation token")((!Res.isUnset() && "should not perform typo correction on annotation token"
) ? static_cast<void> (0) : __assert_fail ("!Res.isUnset() && \"should not perform typo correction on annotation token\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 996, __PRETTY_FUNCTION__))
;
997 break;
998 }
999
1000 case tok::kw___super:
1001 case tok::kw_decltype:
1002 // Annotate the token and tail recurse.
1003 if (TryAnnotateTypeOrScopeToken())
1004 return ExprError();
1005 assert(Tok.isNot(tok::kw_decltype) && Tok.isNot(tok::kw___super))((Tok.isNot(tok::kw_decltype) && Tok.isNot(tok::kw___super
)) ? static_cast<void> (0) : __assert_fail ("Tok.isNot(tok::kw_decltype) && Tok.isNot(tok::kw___super)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 1005, __PRETTY_FUNCTION__))
;
1006 return ParseCastExpression(ParseKind, isAddressOfOperand, isTypeCast,
1007 isVectorLiteral, NotPrimaryExpression);
1008
1009 case tok::identifier: { // primary-expression: identifier
1010 // unqualified-id: identifier
1011 // constant: enumeration-constant
1012 // Turn a potentially qualified name into a annot_typename or
1013 // annot_cxxscope if it would be valid. This handles things like x::y, etc.
1014 if (getLangOpts().CPlusPlus) {
1015 // Avoid the unnecessary parse-time lookup in the common case
1016 // where the syntax forbids a type.
1017 const Token &Next = NextToken();
1018
1019 // If this identifier was reverted from a token ID, and the next token
1020 // is a parenthesis, this is likely to be a use of a type trait. Check
1021 // those tokens.
1022 if (Next.is(tok::l_paren) &&
1023 Tok.is(tok::identifier) &&
1024 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
1025 IdentifierInfo *II = Tok.getIdentifierInfo();
1026 // Build up the mapping of revertible type traits, for future use.
1027 if (RevertibleTypeTraits.empty()) {
1028#define RTT_JOIN(X,Y) X##Y
1029#define REVERTIBLE_TYPE_TRAIT(Name) \
1030 RevertibleTypeTraits[PP.getIdentifierInfo(#Name)] \
1031 = RTT_JOIN(tok::kw_,Name)
1032
1033 REVERTIBLE_TYPE_TRAIT(__is_abstract);
1034 REVERTIBLE_TYPE_TRAIT(__is_aggregate);
1035 REVERTIBLE_TYPE_TRAIT(__is_arithmetic);
1036 REVERTIBLE_TYPE_TRAIT(__is_array);
1037 REVERTIBLE_TYPE_TRAIT(__is_assignable);
1038 REVERTIBLE_TYPE_TRAIT(__is_base_of);
1039 REVERTIBLE_TYPE_TRAIT(__is_class);
1040 REVERTIBLE_TYPE_TRAIT(__is_complete_type);
1041 REVERTIBLE_TYPE_TRAIT(__is_compound);
1042 REVERTIBLE_TYPE_TRAIT(__is_const);
1043 REVERTIBLE_TYPE_TRAIT(__is_constructible);
1044 REVERTIBLE_TYPE_TRAIT(__is_convertible);
1045 REVERTIBLE_TYPE_TRAIT(__is_convertible_to);
1046 REVERTIBLE_TYPE_TRAIT(__is_destructible);
1047 REVERTIBLE_TYPE_TRAIT(__is_empty);
1048 REVERTIBLE_TYPE_TRAIT(__is_enum);
1049 REVERTIBLE_TYPE_TRAIT(__is_floating_point);
1050 REVERTIBLE_TYPE_TRAIT(__is_final);
1051 REVERTIBLE_TYPE_TRAIT(__is_function);
1052 REVERTIBLE_TYPE_TRAIT(__is_fundamental);
1053 REVERTIBLE_TYPE_TRAIT(__is_integral);
1054 REVERTIBLE_TYPE_TRAIT(__is_interface_class);
1055 REVERTIBLE_TYPE_TRAIT(__is_literal);
1056 REVERTIBLE_TYPE_TRAIT(__is_lvalue_expr);
1057 REVERTIBLE_TYPE_TRAIT(__is_lvalue_reference);
1058 REVERTIBLE_TYPE_TRAIT(__is_member_function_pointer);
1059 REVERTIBLE_TYPE_TRAIT(__is_member_object_pointer);
1060 REVERTIBLE_TYPE_TRAIT(__is_member_pointer);
1061 REVERTIBLE_TYPE_TRAIT(__is_nothrow_assignable);
1062 REVERTIBLE_TYPE_TRAIT(__is_nothrow_constructible);
1063 REVERTIBLE_TYPE_TRAIT(__is_nothrow_destructible);
1064 REVERTIBLE_TYPE_TRAIT(__is_object);
1065 REVERTIBLE_TYPE_TRAIT(__is_pod);
1066 REVERTIBLE_TYPE_TRAIT(__is_pointer);
1067 REVERTIBLE_TYPE_TRAIT(__is_polymorphic);
1068 REVERTIBLE_TYPE_TRAIT(__is_reference);
1069 REVERTIBLE_TYPE_TRAIT(__is_rvalue_expr);
1070 REVERTIBLE_TYPE_TRAIT(__is_rvalue_reference);
1071 REVERTIBLE_TYPE_TRAIT(__is_same);
1072 REVERTIBLE_TYPE_TRAIT(__is_scalar);
1073 REVERTIBLE_TYPE_TRAIT(__is_sealed);
1074 REVERTIBLE_TYPE_TRAIT(__is_signed);
1075 REVERTIBLE_TYPE_TRAIT(__is_standard_layout);
1076 REVERTIBLE_TYPE_TRAIT(__is_trivial);
1077 REVERTIBLE_TYPE_TRAIT(__is_trivially_assignable);
1078 REVERTIBLE_TYPE_TRAIT(__is_trivially_constructible);
1079 REVERTIBLE_TYPE_TRAIT(__is_trivially_copyable);
1080 REVERTIBLE_TYPE_TRAIT(__is_union);
1081 REVERTIBLE_TYPE_TRAIT(__is_unsigned);
1082 REVERTIBLE_TYPE_TRAIT(__is_void);
1083 REVERTIBLE_TYPE_TRAIT(__is_volatile);
1084#undef REVERTIBLE_TYPE_TRAIT
1085#undef RTT_JOIN
1086 }
1087
1088 // If we find that this is in fact the name of a type trait,
1089 // update the token kind in place and parse again to treat it as
1090 // the appropriate kind of type trait.
1091 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
1092 = RevertibleTypeTraits.find(II);
1093 if (Known != RevertibleTypeTraits.end()) {
1094 Tok.setKind(Known->second);
1095 return ParseCastExpression(ParseKind, isAddressOfOperand,
1096 NotCastExpr, isTypeCast,
1097 isVectorLiteral, NotPrimaryExpression);
1098 }
1099 }
1100
1101 if ((!ColonIsSacred && Next.is(tok::colon)) ||
1102 Next.isOneOf(tok::coloncolon, tok::less, tok::l_paren,
1103 tok::l_brace)) {
1104 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
1105 if (TryAnnotateTypeOrScopeToken())
1106 return ExprError();
1107 if (!Tok.is(tok::identifier))
1108 return ParseCastExpression(ParseKind, isAddressOfOperand,
1109 NotCastExpr, isTypeCast,
1110 isVectorLiteral,
1111 NotPrimaryExpression);
1112 }
1113 }
1114
1115 // Consume the identifier so that we can see if it is followed by a '(' or
1116 // '.'.
1117 IdentifierInfo &II = *Tok.getIdentifierInfo();
1118 SourceLocation ILoc = ConsumeToken();
1119
1120 // Support 'Class.property' and 'super.property' notation.
1121 if (getLangOpts().ObjC && Tok.is(tok::period) &&
1122 (Actions.getTypeName(II, ILoc, getCurScope()) ||
1123 // Allow the base to be 'super' if in an objc-method.
1124 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
1125 ConsumeToken();
1126
1127 if (Tok.is(tok::code_completion) && &II != Ident_super) {
1128 Actions.CodeCompleteObjCClassPropertyRefExpr(
1129 getCurScope(), II, ILoc, ExprStatementTokLoc == ILoc);
1130 cutOffParsing();
1131 return ExprError();
1132 }
1133 // Allow either an identifier or the keyword 'class' (in C++).
1134 if (Tok.isNot(tok::identifier) &&
1135 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
1136 Diag(Tok, diag::err_expected_property_name);
1137 return ExprError();
1138 }
1139 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
1140 SourceLocation PropertyLoc = ConsumeToken();
1141
1142 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
1143 ILoc, PropertyLoc);
1144 break;
1145 }
1146
1147 // In an Objective-C method, if we have "super" followed by an identifier,
1148 // the token sequence is ill-formed. However, if there's a ':' or ']' after
1149 // that identifier, this is probably a message send with a missing open
1150 // bracket. Treat it as such.
1151 if (getLangOpts().ObjC && &II == Ident_super && !InMessageExpression &&
1152 getCurScope()->isInObjcMethodScope() &&
1153 ((Tok.is(tok::identifier) &&
1154 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
1155 Tok.is(tok::code_completion))) {
1156 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, nullptr,
1157 nullptr);
1158 break;
1159 }
1160
1161 // If we have an Objective-C class name followed by an identifier
1162 // and either ':' or ']', this is an Objective-C class message
1163 // send that's missing the opening '['. Recovery
1164 // appropriately. Also take this path if we're performing code
1165 // completion after an Objective-C class name.
1166 if (getLangOpts().ObjC &&
1167 ((Tok.is(tok::identifier) && !InMessageExpression) ||
1168 Tok.is(tok::code_completion))) {
1169 const Token& Next = NextToken();
1170 if (Tok.is(tok::code_completion) ||
1171 Next.is(tok::colon) || Next.is(tok::r_square))
1172 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
1173 if (Typ.get()->isObjCObjectOrInterfaceType()) {
1174 // Fake up a Declarator to use with ActOnTypeName.
1175 DeclSpec DS(AttrFactory);
1176 DS.SetRangeStart(ILoc);
1177 DS.SetRangeEnd(ILoc);
1178 const char *PrevSpec = nullptr;
1179 unsigned DiagID;
1180 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ,
1181 Actions.getASTContext().getPrintingPolicy());
1182
1183 Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
1184 TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
1185 DeclaratorInfo);
1186 if (Ty.isInvalid())
1187 break;
1188
1189 Res = ParseObjCMessageExpressionBody(SourceLocation(),
1190 SourceLocation(),
1191 Ty.get(), nullptr);
1192 break;
1193 }
1194 }
1195
1196 // Make sure to pass down the right value for isAddressOfOperand.
1197 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
1198 isAddressOfOperand = false;
1199
1200 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we
1201 // need to know whether or not this identifier is a function designator or
1202 // not.
1203 UnqualifiedId Name;
1204 CXXScopeSpec ScopeSpec;
1205 SourceLocation TemplateKWLoc;
1206 Token Replacement;
1207 CastExpressionIdValidator Validator(
1208 /*Next=*/Tok,
1209 /*AllowTypes=*/isTypeCast != NotTypeCast,
1210 /*AllowNonTypes=*/isTypeCast != IsTypeCast);
1211 Validator.IsAddressOfOperand = isAddressOfOperand;
1212 if (Tok.isOneOf(tok::periodstar, tok::arrowstar)) {
1213 Validator.WantExpressionKeywords = false;
1214 Validator.WantRemainingKeywords = false;
1215 } else {
1216 Validator.WantRemainingKeywords = Tok.isNot(tok::r_paren);
1217 }
1218 Name.setIdentifier(&II, ILoc);
1219 Res = Actions.ActOnIdExpression(
1220 getCurScope(), ScopeSpec, TemplateKWLoc, Name, Tok.is(tok::l_paren),
1221 isAddressOfOperand, &Validator,
1222 /*IsInlineAsmIdentifier=*/false,
1223 Tok.is(tok::r_paren) ? nullptr : &Replacement);
1224 if (!Res.isInvalid() && Res.isUnset()) {
1225 UnconsumeToken(Replacement);
1226 return ParseCastExpression(ParseKind, isAddressOfOperand,
1227 NotCastExpr, isTypeCast,
1228 /*isVectorLiteral=*/false,
1229 NotPrimaryExpression);
1230 }
1231 if (!Res.isInvalid() && Tok.is(tok::less))
1232 checkPotentialAngleBracket(Res);
1233 break;
1234 }
1235 case tok::char_constant: // constant: character-constant
1236 case tok::wide_char_constant:
1237 case tok::utf8_char_constant:
1238 case tok::utf16_char_constant:
1239 case tok::utf32_char_constant:
1240 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
1241 ConsumeToken();
1242 break;
1243 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
1244 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
1245 case tok::kw___FUNCDNAME__: // primary-expression: __FUNCDNAME__ [MS]
1246 case tok::kw___FUNCSIG__: // primary-expression: __FUNCSIG__ [MS]
1247 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS]
1248 case tok::kw_L__FUNCSIG__: // primary-expression: L__FUNCSIG__ [MS]
1249 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
1250 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
1251 ConsumeToken();
1252 break;
1253 case tok::string_literal: // primary-expression: string-literal
1254 case tok::wide_string_literal:
1255 case tok::utf8_string_literal:
1256 case tok::utf16_string_literal:
1257 case tok::utf32_string_literal:
1258 Res = ParseStringLiteralExpression(true);
1259 break;
1260 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1]
1261 Res = ParseGenericSelectionExpression();
1262 break;
1263 case tok::kw___builtin_available:
1264 return ParseAvailabilityCheckExpr(Tok.getLocation());
1265 case tok::kw___builtin_va_arg:
1266 case tok::kw___builtin_offsetof:
1267 case tok::kw___builtin_choose_expr:
1268 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
1269 case tok::kw___builtin_convertvector:
1270 case tok::kw___builtin_COLUMN:
1271 case tok::kw___builtin_FILE:
1272 case tok::kw___builtin_FUNCTION:
1273 case tok::kw___builtin_LINE:
1274 if (NotPrimaryExpression)
1275 *NotPrimaryExpression = true;
1276 return ParseBuiltinPrimaryExpression();
1277 case tok::kw___null:
1278 return Actions.ActOnGNUNullExpr(ConsumeToken());
1279
1280 case tok::plusplus: // unary-expression: '++' unary-expression [C99]
1281 case tok::minusminus: { // unary-expression: '--' unary-expression [C99]
1282 if (NotPrimaryExpression)
1283 *NotPrimaryExpression = true;
1284 // C++ [expr.unary] has:
1285 // unary-expression:
1286 // ++ cast-expression
1287 // -- cast-expression
1288 Token SavedTok = Tok;
1289 ConsumeToken();
1290
1291 PreferredType.enterUnary(Actions, Tok.getLocation(), SavedTok.getKind(),
1292 SavedTok.getLocation());
1293 // One special case is implicitly handled here: if the preceding tokens are
1294 // an ambiguous cast expression, such as "(T())++", then we recurse to
1295 // determine whether the '++' is prefix or postfix.
1296 Res = ParseCastExpression(getLangOpts().CPlusPlus ?
1297 UnaryExprOnly : AnyCastExpr,
1298 /*isAddressOfOperand*/false, NotCastExpr,
1299 NotTypeCast);
1300 if (NotCastExpr) {
1301 // If we return with NotCastExpr = true, we must not consume any tokens,
1302 // so put the token back where we found it.
1303 assert(Res.isInvalid())((Res.isInvalid()) ? static_cast<void> (0) : __assert_fail
("Res.isInvalid()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 1303, __PRETTY_FUNCTION__))
;
1304 UnconsumeToken(SavedTok);
1305 return ExprError();
1306 }
1307 if (!Res.isInvalid())
1308 Res = Actions.ActOnUnaryOp(getCurScope(), SavedTok.getLocation(),
1309 SavedKind, Res.get());
1310 return Res;
1311 }
1312 case tok::amp: { // unary-expression: '&' cast-expression
1313 if (NotPrimaryExpression)
1314 *NotPrimaryExpression = true;
1315 // Special treatment because of member pointers
1316 SourceLocation SavedLoc = ConsumeToken();
1317 PreferredType.enterUnary(Actions, Tok.getLocation(), tok::amp, SavedLoc);
1318 Res = ParseCastExpression(AnyCastExpr, true);
1319 if (!Res.isInvalid())
1320 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1321 return Res;
1322 }
1323
1324 case tok::star: // unary-expression: '*' cast-expression
1325 case tok::plus: // unary-expression: '+' cast-expression
1326 case tok::minus: // unary-expression: '-' cast-expression
1327 case tok::tilde: // unary-expression: '~' cast-expression
1328 case tok::exclaim: // unary-expression: '!' cast-expression
1329 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU]
1330 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU]
1331 if (NotPrimaryExpression)
1332 *NotPrimaryExpression = true;
1333 SourceLocation SavedLoc = ConsumeToken();
1334 PreferredType.enterUnary(Actions, Tok.getLocation(), SavedKind, SavedLoc);
1335 Res = ParseCastExpression(AnyCastExpr);
1336 if (!Res.isInvalid())
1337 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1338 return Res;
1339 }
1340
1341 case tok::kw_co_await: { // unary-expression: 'co_await' cast-expression
1342 if (NotPrimaryExpression)
1343 *NotPrimaryExpression = true;
1344 SourceLocation CoawaitLoc = ConsumeToken();
1345 Res = ParseCastExpression(AnyCastExpr);
1346 if (!Res.isInvalid())
1347 Res = Actions.ActOnCoawaitExpr(getCurScope(), CoawaitLoc, Res.get());
1348 return Res;
1349 }
1350
1351 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
1352 // __extension__ silences extension warnings in the subexpression.
1353 if (NotPrimaryExpression)
1354 *NotPrimaryExpression = true;
1355 ExtensionRAIIObject O(Diags); // Use RAII to do this.
1356 SourceLocation SavedLoc = ConsumeToken();
1357 Res = ParseCastExpression(AnyCastExpr);
1358 if (!Res.isInvalid())
1359 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1360 return Res;
1361 }
1362 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')'
1363 if (!getLangOpts().C11)
1364 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
1365 LLVM_FALLTHROUGH[[gnu::fallthrough]];
1366 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')'
1367 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
1368 // unary-expression: '__alignof' '(' type-name ')'
1369 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
1370 // unary-expression: 'sizeof' '(' type-name ')'
1371 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression
1372 // unary-expression: '__builtin_omp_required_simd_align' '(' type-name ')'
1373 case tok::kw___builtin_omp_required_simd_align:
1374 if (NotPrimaryExpression)
1375 *NotPrimaryExpression = true;
1376 return ParseUnaryExprOrTypeTraitExpression();
1377 case tok::ampamp: { // unary-expression: '&&' identifier
1378 if (NotPrimaryExpression)
1379 *NotPrimaryExpression = true;
1380 SourceLocation AmpAmpLoc = ConsumeToken();
1381 if (Tok.isNot(tok::identifier))
1382 return ExprError(Diag(Tok, diag::err_expected) << tok::identifier);
1383
1384 if (getCurScope()->getFnParent() == nullptr)
1385 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
1386
1387 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
1388 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
1389 Tok.getLocation());
1390 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
1391 ConsumeToken();
1392 return Res;
1393 }
1394 case tok::kw_const_cast:
1395 case tok::kw_dynamic_cast:
1396 case tok::kw_reinterpret_cast:
1397 case tok::kw_static_cast:
1398 if (NotPrimaryExpression)
1399 *NotPrimaryExpression = true;
1400 Res = ParseCXXCasts();
1401 break;
1402 case tok::kw___builtin_bit_cast:
1403 if (NotPrimaryExpression)
1404 *NotPrimaryExpression = true;
1405 Res = ParseBuiltinBitCast();
1406 break;
1407 case tok::kw_typeid:
1408 if (NotPrimaryExpression)
1409 *NotPrimaryExpression = true;
1410 Res = ParseCXXTypeid();
1411 break;
1412 case tok::kw___uuidof:
1413 if (NotPrimaryExpression)
1414 *NotPrimaryExpression = true;
1415 Res = ParseCXXUuidof();
1416 break;
1417 case tok::kw_this:
1418 Res = ParseCXXThis();
1419 break;
1420
1421 case tok::annot_typename:
1422 if (isStartOfObjCClassMessageMissingOpenBracket()) {
1423 ParsedType Type = getTypeAnnotation(Tok);
1424
1425 // Fake up a Declarator to use with ActOnTypeName.
1426 DeclSpec DS(AttrFactory);
1427 DS.SetRangeStart(Tok.getLocation());
1428 DS.SetRangeEnd(Tok.getLastLoc());
1429
1430 const char *PrevSpec = nullptr;
1431 unsigned DiagID;
1432 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
1433 PrevSpec, DiagID, Type,
1434 Actions.getASTContext().getPrintingPolicy());
1435
1436 Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
1437 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1438 if (Ty.isInvalid())
1439 break;
1440
1441 ConsumeAnnotationToken();
1442 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1443 Ty.get(), nullptr);
1444 break;
1445 }
1446 LLVM_FALLTHROUGH[[gnu::fallthrough]];
1447
1448 case tok::annot_decltype:
1449 case tok::kw_char:
1450 case tok::kw_wchar_t:
1451 case tok::kw_char8_t:
1452 case tok::kw_char16_t:
1453 case tok::kw_char32_t:
1454 case tok::kw_bool:
1455 case tok::kw_short:
1456 case tok::kw_int:
1457 case tok::kw_long:
1458 case tok::kw___int64:
1459 case tok::kw___int128:
1460 case tok::kw_signed:
1461 case tok::kw_unsigned:
1462 case tok::kw_half:
1463 case tok::kw_float:
1464 case tok::kw_double:
1465 case tok::kw__Float16:
1466 case tok::kw___float128:
1467 case tok::kw_void:
1468 case tok::kw_typename:
1469 case tok::kw_typeof:
1470 case tok::kw___vector:
1471#define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
1472#include "clang/Basic/OpenCLImageTypes.def"
1473 {
1474 if (!getLangOpts().CPlusPlus) {
1475 Diag(Tok, diag::err_expected_expression);
1476 return ExprError();
1477 }
1478
1479 // Everything henceforth is a postfix-expression.
1480 if (NotPrimaryExpression)
1481 *NotPrimaryExpression = true;
1482
1483 if (SavedKind == tok::kw_typename) {
1484 // postfix-expression: typename-specifier '(' expression-list[opt] ')'
1485 // typename-specifier braced-init-list
1486 if (TryAnnotateTypeOrScopeToken())
1487 return ExprError();
1488
1489 if (!Actions.isSimpleTypeSpecifier(Tok.getKind()))
1490 // We are trying to parse a simple-type-specifier but might not get such
1491 // a token after error recovery.
1492 return ExprError();
1493 }
1494
1495 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
1496 // simple-type-specifier braced-init-list
1497 //
1498 DeclSpec DS(AttrFactory);
1499
1500 ParseCXXSimpleTypeSpecifier(DS);
1501 if (Tok.isNot(tok::l_paren) &&
1502 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
1503 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
1504 << DS.getSourceRange());
1505
1506 if (Tok.is(tok::l_brace))
1507 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1508
1509 Res = ParseCXXTypeConstructExpression(DS);
1510 break;
1511 }
1512
1513 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
1514 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
1515 // (We can end up in this situation after tentative parsing.)
1516 if (TryAnnotateTypeOrScopeToken())
1517 return ExprError();
1518 if (!Tok.is(tok::annot_cxxscope))
1519 return ParseCastExpression(ParseKind, isAddressOfOperand, NotCastExpr,
1520 isTypeCast, isVectorLiteral,
1521 NotPrimaryExpression);
1522
1523 Token Next = NextToken();
1524 if (Next.is(tok::annot_template_id)) {
1525 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
1526 if (TemplateId->Kind == TNK_Type_template) {
1527 // We have a qualified template-id that we know refers to a
1528 // type, translate it into a type and continue parsing as a
1529 // cast expression.
1530 CXXScopeSpec SS;
1531 ParseOptionalCXXScopeSpecifier(SS, nullptr,
1532 /*EnteringContext=*/false);
1533 AnnotateTemplateIdTokenAsType();
1534 return ParseCastExpression(ParseKind, isAddressOfOperand, NotCastExpr,
1535 isTypeCast, isVectorLiteral,
1536 NotPrimaryExpression);
1537 }
1538 }
1539
1540 // Parse as an id-expression.
1541 Res = ParseCXXIdExpression(isAddressOfOperand);
1542 break;
1543 }
1544
1545 case tok::annot_template_id: { // [C++] template-id
1546 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1547 if (TemplateId->Kind == TNK_Type_template) {
1548 // We have a template-id that we know refers to a type,
1549 // translate it into a type and continue parsing as a cast
1550 // expression.
1551 AnnotateTemplateIdTokenAsType();
1552 return ParseCastExpression(ParseKind, isAddressOfOperand,
1553 NotCastExpr, isTypeCast, isVectorLiteral,
1554 NotPrimaryExpression);
1555 }
1556
1557 // Fall through to treat the template-id as an id-expression.
1558 LLVM_FALLTHROUGH[[gnu::fallthrough]];
1559 }
1560
1561 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
1562 Res = ParseCXXIdExpression(isAddressOfOperand);
1563 break;
1564
1565 case tok::coloncolon: {
1566 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
1567 // annotates the token, tail recurse.
1568 if (TryAnnotateTypeOrScopeToken())
1569 return ExprError();
1570 if (!Tok.is(tok::coloncolon))
1571 return ParseCastExpression(ParseKind, isAddressOfOperand, isTypeCast,
1572 isVectorLiteral, NotPrimaryExpression);
1573
1574 // ::new -> [C++] new-expression
1575 // ::delete -> [C++] delete-expression
1576 SourceLocation CCLoc = ConsumeToken();
1577 if (Tok.is(tok::kw_new)) {
1578 if (NotPrimaryExpression)
1579 *NotPrimaryExpression = true;
1580 return ParseCXXNewExpression(true, CCLoc);
1581 }
1582 if (Tok.is(tok::kw_delete)) {
1583 if (NotPrimaryExpression)
1584 *NotPrimaryExpression = true;
1585 return ParseCXXDeleteExpression(true, CCLoc);
1586 }
1587
1588 // This is not a type name or scope specifier, it is an invalid expression.
1589 Diag(CCLoc, diag::err_expected_expression);
1590 return ExprError();
1591 }
1592
1593 case tok::kw_new: // [C++] new-expression
1594 if (NotPrimaryExpression)
1595 *NotPrimaryExpression = true;
1596 return ParseCXXNewExpression(false, Tok.getLocation());
1597
1598 case tok::kw_delete: // [C++] delete-expression
1599 if (NotPrimaryExpression)
1600 *NotPrimaryExpression = true;
1601 return ParseCXXDeleteExpression(false, Tok.getLocation());
1602
1603 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
1604 if (NotPrimaryExpression)
1605 *NotPrimaryExpression = true;
1606 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
1607 SourceLocation KeyLoc = ConsumeToken();
1608 BalancedDelimiterTracker T(*this, tok::l_paren);
1609
1610 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
1611 return ExprError();
1612 // C++11 [expr.unary.noexcept]p1:
1613 // The noexcept operator determines whether the evaluation of its operand,
1614 // which is an unevaluated operand, can throw an exception.
1615 EnterExpressionEvaluationContext Unevaluated(
1616 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
1617 ExprResult Result = ParseExpression();
1618
1619 T.consumeClose();
1620
1621 if (!Result.isInvalid())
1622 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
1623 Result.get(), T.getCloseLocation());
1624 return Result;
1625 }
1626
1627#define TYPE_TRAIT(N,Spelling,K) \
1628 case tok::kw_##Spelling:
1629#include "clang/Basic/TokenKinds.def"
1630 return ParseTypeTrait();
1631
1632 case tok::kw___array_rank:
1633 case tok::kw___array_extent:
1634 if (NotPrimaryExpression)
1635 *NotPrimaryExpression = true;
1636 return ParseArrayTypeTrait();
1637
1638 case tok::kw___is_lvalue_expr:
1639 case tok::kw___is_rvalue_expr:
1640 if (NotPrimaryExpression)
1641 *NotPrimaryExpression = true;
1642 return ParseExpressionTrait();
1643
1644 case tok::at: {
1645 if (NotPrimaryExpression)
1646 *NotPrimaryExpression = true;
1647 SourceLocation AtLoc = ConsumeToken();
1648 return ParseObjCAtExpression(AtLoc);
1649 }
1650 case tok::caret:
1651 Res = ParseBlockLiteralExpression();
1652 break;
1653 case tok::code_completion: {
1654 Actions.CodeCompleteExpression(getCurScope(),
1655 PreferredType.get(Tok.getLocation()));
1656 cutOffParsing();
1657 return ExprError();
1658 }
1659 case tok::l_square:
1660 if (getLangOpts().CPlusPlus11) {
1661 if (getLangOpts().ObjC) {
1662 // C++11 lambda expressions and Objective-C message sends both start with a
1663 // square bracket. There are three possibilities here:
1664 // we have a valid lambda expression, we have an invalid lambda
1665 // expression, or we have something that doesn't appear to be a lambda.
1666 // If we're in the last case, we fall back to ParseObjCMessageExpression.
1667 Res = TryParseLambdaExpression();
1668 if (!Res.isInvalid() && !Res.get()) {
1669 // We assume Objective-C++ message expressions are not
1670 // primary-expressions.
1671 if (NotPrimaryExpression)
1672 *NotPrimaryExpression = true;
1673 Res = ParseObjCMessageExpression();
1674 }
1675 break;
1676 }
1677 Res = ParseLambdaExpression();
1678 break;
1679 }
1680 if (getLangOpts().ObjC) {
1681 Res = ParseObjCMessageExpression();
1682 break;
1683 }
1684 LLVM_FALLTHROUGH[[gnu::fallthrough]];
1685 default:
1686 NotCastExpr = true;
1687 return ExprError();
1688 }
1689
1690 // Check to see whether Res is a function designator only. If it is and we
1691 // are compiling for OpenCL, we need to return an error as this implies
1692 // that the address of the function is being taken, which is illegal in CL.
1693
1694 if (ParseKind == PrimaryExprOnly)
1695 // This is strictly a primary-expression - no postfix-expr pieces should be
1696 // parsed.
1697 return Res;
1698
1699 // These can be followed by postfix-expr pieces.
1700 PreferredType = SavedType;
1701 Res = ParsePostfixExpressionSuffix(Res);
1702 if (getLangOpts().OpenCL)
1703 if (Expr *PostfixExpr = Res.get()) {
1704 QualType Ty = PostfixExpr->getType();
1705 if (!Ty.isNull() && Ty->isFunctionType()) {
1706 Diag(PostfixExpr->getExprLoc(),
1707 diag::err_opencl_taking_function_address_parser);
1708 return ExprError();
1709 }
1710 }
1711
1712 return Res;
1713}
1714
1715/// Once the leading part of a postfix-expression is parsed, this
1716/// method parses any suffixes that apply.
1717///
1718/// \verbatim
1719/// postfix-expression: [C99 6.5.2]
1720/// primary-expression
1721/// postfix-expression '[' expression ']'
1722/// postfix-expression '[' braced-init-list ']'
1723/// postfix-expression '(' argument-expression-list[opt] ')'
1724/// postfix-expression '.' identifier
1725/// postfix-expression '->' identifier
1726/// postfix-expression '++'
1727/// postfix-expression '--'
1728/// '(' type-name ')' '{' initializer-list '}'
1729/// '(' type-name ')' '{' initializer-list ',' '}'
1730///
1731/// argument-expression-list: [C99 6.5.2]
1732/// argument-expression ...[opt]
1733/// argument-expression-list ',' assignment-expression ...[opt]
1734/// \endverbatim
1735ExprResult
1736Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
1737 // Now that the primary-expression piece of the postfix-expression has been
1738 // parsed, see if there are any postfix-expression pieces here.
1739 SourceLocation Loc;
1740 auto SavedType = PreferredType;
1741 while (1) {
1742 // Each iteration relies on preferred type for the whole expression.
1743 PreferredType = SavedType;
1744 switch (Tok.getKind()) {
1745 case tok::code_completion:
1746 if (InMessageExpression)
1747 return LHS;
1748
1749 Actions.CodeCompletePostfixExpression(
1750 getCurScope(), LHS, PreferredType.get(Tok.getLocation()));
1751 cutOffParsing();
1752 return ExprError();
1753
1754 case tok::identifier:
1755 // If we see identifier: after an expression, and we're not already in a
1756 // message send, then this is probably a message send with a missing
1757 // opening bracket '['.
1758 if (getLangOpts().ObjC && !InMessageExpression &&
1759 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
1760 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1761 nullptr, LHS.get());
1762 break;
1763 }
1764 // Fall through; this isn't a message send.
1765 LLVM_FALLTHROUGH[[gnu::fallthrough]];
1766
1767 default: // Not a postfix-expression suffix.
1768 return LHS;
1769 case tok::l_square: { // postfix-expression: p-e '[' expression ']'
1770 // If we have a array postfix expression that starts on a new line and
1771 // Objective-C is enabled, it is highly likely that the user forgot a
1772 // semicolon after the base expression and that the array postfix-expr is
1773 // actually another message send. In this case, do some look-ahead to see
1774 // if the contents of the square brackets are obviously not a valid
1775 // expression and recover by pretending there is no suffix.
1776 if (getLangOpts().ObjC && Tok.isAtStartOfLine() &&
1777 isSimpleObjCMessageExpression())
1778 return LHS;
1779
1780 // Reject array indices starting with a lambda-expression. '[[' is
1781 // reserved for attributes.
1782 if (CheckProhibitedCXX11Attribute()) {
1783 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1784 return ExprError();
1785 }
1786
1787 BalancedDelimiterTracker T(*this, tok::l_square);
1788 T.consumeOpen();
1789 Loc = T.getOpenLocation();
1790 ExprResult Idx, Length;
1791 SourceLocation ColonLoc;
1792 PreferredType.enterSubscript(Actions, Tok.getLocation(), LHS.get());
1793 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1794 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1795 Idx = ParseBraceInitializer();
1796 } else if (getLangOpts().OpenMP) {
1797 ColonProtectionRAIIObject RAII(*this);
1798 // Parse [: or [ expr or [ expr :
1799 if (!Tok.is(tok::colon)) {
1800 // [ expr
1801 Idx = ParseExpression();
1802 }
1803 if (Tok.is(tok::colon)) {
1804 // Consume ':'
1805 ColonLoc = ConsumeToken();
1806 if (Tok.isNot(tok::r_square))
1807 Length = ParseExpression();
1808 }
1809 } else
1810 Idx = ParseExpression();
1811
1812 SourceLocation RLoc = Tok.getLocation();
1813
1814 LHS = Actions.CorrectDelayedTyposInExpr(LHS);
1815 Idx = Actions.CorrectDelayedTyposInExpr(Idx);
1816 Length = Actions.CorrectDelayedTyposInExpr(Length);
1817 if (!LHS.isInvalid() && !Idx.isInvalid() && !Length.isInvalid() &&
1818 Tok.is(tok::r_square)) {
1819 if (ColonLoc.isValid()) {
1820 LHS = Actions.ActOnOMPArraySectionExpr(LHS.get(), Loc, Idx.get(),
1821 ColonLoc, Length.get(), RLoc);
1822 } else {
1823 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.get(), Loc,
1824 Idx.get(), RLoc);
1825 }
1826 } else {
1827 LHS = ExprError();
1828 Idx = ExprError();
1829 }
1830
1831 // Match the ']'.
1832 T.consumeClose();
1833 break;
1834 }
1835
1836 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')'
1837 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>'
1838 // '(' argument-expression-list[opt] ')'
1839 tok::TokenKind OpKind = Tok.getKind();
1840 InMessageExpressionRAIIObject InMessage(*this, false);
1841
1842 Expr *ExecConfig = nullptr;
1843
1844 BalancedDelimiterTracker PT(*this, tok::l_paren);
1845
1846 if (OpKind == tok::lesslessless) {
1847 ExprVector ExecConfigExprs;
1848 CommaLocsTy ExecConfigCommaLocs;
1849 SourceLocation OpenLoc = ConsumeToken();
1850
1851 if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
1852 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1853 LHS = ExprError();
1854 }
1855
1856 SourceLocation CloseLoc;
1857 if (TryConsumeToken(tok::greatergreatergreater, CloseLoc)) {
1858 } else if (LHS.isInvalid()) {
1859 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1860 } else {
1861 // There was an error closing the brackets
1862 Diag(Tok, diag::err_expected) << tok::greatergreatergreater;
1863 Diag(OpenLoc, diag::note_matching) << tok::lesslessless;
1864 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1865 LHS = ExprError();
1866 }
1867
1868 if (!LHS.isInvalid()) {
1869 if (ExpectAndConsume(tok::l_paren))
1870 LHS = ExprError();
1871 else
1872 Loc = PrevTokLocation;
1873 }
1874
1875 if (!LHS.isInvalid()) {
1876 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
1877 OpenLoc,
1878 ExecConfigExprs,
1879 CloseLoc);
1880 if (ECResult.isInvalid())
1881 LHS = ExprError();
1882 else
1883 ExecConfig = ECResult.get();
1884 }
1885 } else {
1886 PT.consumeOpen();
1887 Loc = PT.getOpenLocation();
1888 }
1889
1890 ExprVector ArgExprs;
1891 CommaLocsTy CommaLocs;
1892 auto RunSignatureHelp = [&]() -> QualType {
1893 QualType PreferredType = Actions.ProduceCallSignatureHelp(
1894 getCurScope(), LHS.get(), ArgExprs, PT.getOpenLocation());
1895 CalledSignatureHelp = true;
1896 return PreferredType;
1897 };
1898 if (OpKind == tok::l_paren || !LHS.isInvalid()) {
1899 if (Tok.isNot(tok::r_paren)) {
1900 if (ParseExpressionList(ArgExprs, CommaLocs, [&] {
1901 PreferredType.enterFunctionArgument(Tok.getLocation(),
1902 RunSignatureHelp);
1903 })) {
1904 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1905 // If we got an error when parsing expression list, we don't call
1906 // the CodeCompleteCall handler inside the parser. So call it here
1907 // to make sure we get overload suggestions even when we are in the
1908 // middle of a parameter.
1909 if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
1910 RunSignatureHelp();
1911 LHS = ExprError();
1912 } else if (LHS.isInvalid()) {
1913 for (auto &E : ArgExprs)
1914 Actions.CorrectDelayedTyposInExpr(E);
1915 }
1916 }
1917 }
1918
1919 // Match the ')'.
1920 if (LHS.isInvalid()) {
1921 SkipUntil(tok::r_paren, StopAtSemi);
1922 } else if (Tok.isNot(tok::r_paren)) {
1923 bool HadDelayedTypo = false;
1924 if (Actions.CorrectDelayedTyposInExpr(LHS).get() != LHS.get())
1925 HadDelayedTypo = true;
1926 for (auto &E : ArgExprs)
1927 if (Actions.CorrectDelayedTyposInExpr(E).get() != E)
1928 HadDelayedTypo = true;
1929 // If there were delayed typos in the LHS or ArgExprs, call SkipUntil
1930 // instead of PT.consumeClose() to avoid emitting extra diagnostics for
1931 // the unmatched l_paren.
1932 if (HadDelayedTypo)
1933 SkipUntil(tok::r_paren, StopAtSemi);
1934 else
1935 PT.consumeClose();
1936 LHS = ExprError();
1937 } else {
1938 assert((ArgExprs.size() == 0 ||(((ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size
())&& "Unexpected number of commas!") ? static_cast<
void> (0) : __assert_fail ("(ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size())&& \"Unexpected number of commas!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 1940, __PRETTY_FUNCTION__))
1939 ArgExprs.size()-1 == CommaLocs.size())&&(((ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size
())&& "Unexpected number of commas!") ? static_cast<
void> (0) : __assert_fail ("(ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size())&& \"Unexpected number of commas!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 1940, __PRETTY_FUNCTION__))
1940 "Unexpected number of commas!")(((ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size
())&& "Unexpected number of commas!") ? static_cast<
void> (0) : __assert_fail ("(ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size())&& \"Unexpected number of commas!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 1940, __PRETTY_FUNCTION__))
;
1941 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.get(), Loc,
1942 ArgExprs, Tok.getLocation(),
1943 ExecConfig);
1944 PT.consumeClose();
1945 }
1946
1947 break;
1948 }
1949 case tok::arrow:
1950 case tok::period: {
1951 // postfix-expression: p-e '->' template[opt] id-expression
1952 // postfix-expression: p-e '.' template[opt] id-expression
1953 tok::TokenKind OpKind = Tok.getKind();
1954 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
1955
1956 CXXScopeSpec SS;
1957 ParsedType ObjectType;
1958 bool MayBePseudoDestructor = false;
1959 Expr* OrigLHS = !LHS.isInvalid() ? LHS.get() : nullptr;
1960
1961 PreferredType.enterMemAccess(Actions, Tok.getLocation(), OrigLHS);
1962
1963 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
1964 Expr *Base = OrigLHS;
1965 const Type* BaseType = Base->getType().getTypePtrOrNull();
1966 if (BaseType && Tok.is(tok::l_paren) &&
1967 (BaseType->isFunctionType() ||
1968 BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) {
1969 Diag(OpLoc, diag::err_function_is_not_record)
1970 << OpKind << Base->getSourceRange()
1971 << FixItHint::CreateRemoval(OpLoc);
1972 return ParsePostfixExpressionSuffix(Base);
1973 }
1974
1975 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base,
1976 OpLoc, OpKind, ObjectType,
1977 MayBePseudoDestructor);
1978 if (LHS.isInvalid())
1979 break;
1980
1981 ParseOptionalCXXScopeSpecifier(SS, ObjectType,
1982 /*EnteringContext=*/false,
1983 &MayBePseudoDestructor);
1984 if (SS.isNotEmpty())
1985 ObjectType = nullptr;
1986 }
1987
1988 if (Tok.is(tok::code_completion)) {
1989 tok::TokenKind CorrectedOpKind =
1990 OpKind == tok::arrow ? tok::period : tok::arrow;
1991 ExprResult CorrectedLHS(/*Invalid=*/true);
1992 if (getLangOpts().CPlusPlus && OrigLHS) {
1993 // FIXME: Creating a TentativeAnalysisScope from outside Sema is a
1994 // hack.
1995 Sema::TentativeAnalysisScope Trap(Actions);
1996 CorrectedLHS = Actions.ActOnStartCXXMemberReference(
1997 getCurScope(), OrigLHS, OpLoc, CorrectedOpKind, ObjectType,
1998 MayBePseudoDestructor);
1999 }
2000
2001 Expr *Base = LHS.get();
2002 Expr *CorrectedBase = CorrectedLHS.get();
2003 if (!CorrectedBase && !getLangOpts().CPlusPlus)
2004 CorrectedBase = Base;
2005
2006 // Code completion for a member access expression.
2007 Actions.CodeCompleteMemberReferenceExpr(
2008 getCurScope(), Base, CorrectedBase, OpLoc, OpKind == tok::arrow,
2009 Base && ExprStatementTokLoc == Base->getBeginLoc(),
2010 PreferredType.get(Tok.getLocation()));
2011
2012 cutOffParsing();
2013 return ExprError();
2014 }
2015
2016 if (MayBePseudoDestructor && !LHS.isInvalid()) {
2017 LHS = ParseCXXPseudoDestructor(LHS.get(), OpLoc, OpKind, SS,
2018 ObjectType);
2019 break;
2020 }
2021
2022 // Either the action has told us that this cannot be a
2023 // pseudo-destructor expression (based on the type of base
2024 // expression), or we didn't see a '~' in the right place. We
2025 // can still parse a destructor name here, but in that case it
2026 // names a real destructor.
2027 // Allow explicit constructor calls in Microsoft mode.
2028 // FIXME: Add support for explicit call of template constructor.
2029 SourceLocation TemplateKWLoc;
2030 UnqualifiedId Name;
2031 if (getLangOpts().ObjC && OpKind == tok::period &&
2032 Tok.is(tok::kw_class)) {
2033 // Objective-C++:
2034 // After a '.' in a member access expression, treat the keyword
2035 // 'class' as if it were an identifier.
2036 //
2037 // This hack allows property access to the 'class' method because it is
2038 // such a common method name. For other C++ keywords that are
2039 // Objective-C method names, one must use the message send syntax.
2040 IdentifierInfo *Id = Tok.getIdentifierInfo();
2041 SourceLocation Loc = ConsumeToken();
2042 Name.setIdentifier(Id, Loc);
2043 } else if (ParseUnqualifiedId(SS,
2044 /*EnteringContext=*/false,
2045 /*AllowDestructorName=*/true,
2046 /*AllowConstructorName=*/
2047 getLangOpts().MicrosoftExt &&
2048 SS.isNotEmpty(),
2049 /*AllowDeductionGuide=*/false,
2050 ObjectType, &TemplateKWLoc, Name)) {
2051 (void)Actions.CorrectDelayedTyposInExpr(LHS);
2052 LHS = ExprError();
2053 }
2054
2055 if (!LHS.isInvalid())
2056 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.get(), OpLoc,
2057 OpKind, SS, TemplateKWLoc, Name,
2058 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl
2059 : nullptr);
2060 if (!LHS.isInvalid() && Tok.is(tok::less))
2061 checkPotentialAngleBracket(LHS);
2062 break;
2063 }
2064 case tok::plusplus: // postfix-expression: postfix-expression '++'
2065 case tok::minusminus: // postfix-expression: postfix-expression '--'
2066 if (!LHS.isInvalid()) {
2067 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
2068 Tok.getKind(), LHS.get());
2069 }
2070 ConsumeToken();
2071 break;
2072 }
2073 }
2074}
2075
2076/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
2077/// vec_step and we are at the start of an expression or a parenthesized
2078/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
2079/// expression (isCastExpr == false) or the type (isCastExpr == true).
2080///
2081/// \verbatim
2082/// unary-expression: [C99 6.5.3]
2083/// 'sizeof' unary-expression
2084/// 'sizeof' '(' type-name ')'
2085/// [GNU] '__alignof' unary-expression
2086/// [GNU] '__alignof' '(' type-name ')'
2087/// [C11] '_Alignof' '(' type-name ')'
2088/// [C++0x] 'alignof' '(' type-id ')'
2089///
2090/// [GNU] typeof-specifier:
2091/// typeof ( expressions )
2092/// typeof ( type-name )
2093/// [GNU/C++] typeof unary-expression
2094///
2095/// [OpenCL 1.1 6.11.12] vec_step built-in function:
2096/// vec_step ( expressions )
2097/// vec_step ( type-name )
2098/// \endverbatim
2099ExprResult
2100Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
2101 bool &isCastExpr,
2102 ParsedType &CastTy,
2103 SourceRange &CastRange) {
2104
2105 assert(OpTok.isOneOf(tok::kw_typeof, tok::kw_sizeof, tok::kw___alignof,((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!"
) ? static_cast<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2108, __PRETTY_FUNCTION__))
2106 tok::kw_alignof, tok::kw__Alignof, tok::kw_vec_step,((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!"
) ? static_cast<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2108, __PRETTY_FUNCTION__))
2107 tok::kw___builtin_omp_required_simd_align) &&((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!"
) ? static_cast<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2108, __PRETTY_FUNCTION__))
2108 "Not a typeof/sizeof/alignof/vec_step expression!")((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!"
) ? static_cast<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2108, __PRETTY_FUNCTION__))
;
2109
2110 ExprResult Operand;
2111
2112 // If the operand doesn't start with an '(', it must be an expression.
2113 if (Tok.isNot(tok::l_paren)) {
2114 // If construct allows a form without parenthesis, user may forget to put
2115 // pathenthesis around type name.
2116 if (OpTok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
2117 tok::kw__Alignof)) {
2118 if (isTypeIdUnambiguously()) {
2119 DeclSpec DS(AttrFactory);
2120 ParseSpecifierQualifierList(DS);
2121 Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
2122 ParseDeclarator(DeclaratorInfo);
2123
2124 SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation());
2125 SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation);
2126 Diag(LParenLoc, diag::err_expected_parentheses_around_typename)
2127 << OpTok.getName()
2128 << FixItHint::CreateInsertion(LParenLoc, "(")
2129 << FixItHint::CreateInsertion(RParenLoc, ")");
2130 isCastExpr = true;
2131 return ExprEmpty();
2132 }
2133 }
2134
2135 isCastExpr = false;
2136 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
2137 Diag(Tok, diag::err_expected_after) << OpTok.getIdentifierInfo()
2138 << tok::l_paren;
2139 return ExprError();
2140 }
2141
2142 Operand = ParseCastExpression(UnaryExprOnly);
2143 } else {
2144 // If it starts with a '(', we know that it is either a parenthesized
2145 // type-name, or it is a unary-expression that starts with a compound
2146 // literal, or starts with a primary-expression that is a parenthesized
2147 // expression.
2148 ParenParseOption ExprType = CastExpr;
2149 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
2150
2151 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
2152 false, CastTy, RParenLoc);
2153 CastRange = SourceRange(LParenLoc, RParenLoc);
2154
2155 // If ParseParenExpression parsed a '(typename)' sequence only, then this is
2156 // a type.
2157 if (ExprType == CastExpr) {
2158 isCastExpr = true;
2159 return ExprEmpty();
2160 }
2161
2162 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
2163 // GNU typeof in C requires the expression to be parenthesized. Not so for
2164 // sizeof/alignof or in C++. Therefore, the parenthesized expression is
2165 // the start of a unary-expression, but doesn't include any postfix
2166 // pieces. Parse these now if present.
2167 if (!Operand.isInvalid())
2168 Operand = ParsePostfixExpressionSuffix(Operand.get());
2169 }
2170 }
2171
2172 // If we get here, the operand to the typeof/sizeof/alignof was an expression.
2173 isCastExpr = false;
2174 return Operand;
2175}
2176
2177
2178/// Parse a sizeof or alignof expression.
2179///
2180/// \verbatim
2181/// unary-expression: [C99 6.5.3]
2182/// 'sizeof' unary-expression
2183/// 'sizeof' '(' type-name ')'
2184/// [C++11] 'sizeof' '...' '(' identifier ')'
2185/// [GNU] '__alignof' unary-expression
2186/// [GNU] '__alignof' '(' type-name ')'
2187/// [C11] '_Alignof' '(' type-name ')'
2188/// [C++11] 'alignof' '(' type-id ')'
2189/// \endverbatim
2190ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
2191 assert(Tok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,((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!") ? static_cast
<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2194, __PRETTY_FUNCTION__))
2192 tok::kw__Alignof, tok::kw_vec_step,((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!") ? static_cast
<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2194, __PRETTY_FUNCTION__))
2193 tok::kw___builtin_omp_required_simd_align) &&((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!") ? static_cast
<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2194, __PRETTY_FUNCTION__))
2194 "Not a sizeof/alignof/vec_step expression!")((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!") ? static_cast
<void> (0) : __assert_fail ("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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2194, __PRETTY_FUNCTION__))
;
2195 Token OpTok = Tok;
2196 ConsumeToken();
2197
2198 // [C++11] 'sizeof' '...' '(' identifier ')'
2199 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
2200 SourceLocation EllipsisLoc = ConsumeToken();
2201 SourceLocation LParenLoc, RParenLoc;
2202 IdentifierInfo *Name = nullptr;
2203 SourceLocation NameLoc;
2204 if (Tok.is(tok::l_paren)) {
2205 BalancedDelimiterTracker T(*this, tok::l_paren);
2206 T.consumeOpen();
2207 LParenLoc = T.getOpenLocation();
2208 if (Tok.is(tok::identifier)) {
2209 Name = Tok.getIdentifierInfo();
2210 NameLoc = ConsumeToken();
2211 T.consumeClose();
2212 RParenLoc = T.getCloseLocation();
2213 if (RParenLoc.isInvalid())
2214 RParenLoc = PP.getLocForEndOfToken(NameLoc);
2215 } else {
2216 Diag(Tok, diag::err_expected_parameter_pack);
2217 SkipUntil(tok::r_paren, StopAtSemi);
2218 }
2219 } else if (Tok.is(tok::identifier)) {
2220 Name = Tok.getIdentifierInfo();
2221 NameLoc = ConsumeToken();
2222 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
2223 RParenLoc = PP.getLocForEndOfToken(NameLoc);
2224 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
2225 << Name
2226 << FixItHint::CreateInsertion(LParenLoc, "(")
2227 << FixItHint::CreateInsertion(RParenLoc, ")");
2228 } else {
2229 Diag(Tok, diag::err_sizeof_parameter_pack);
2230 }
2231
2232 if (!Name)
2233 return ExprError();
2234
2235 EnterExpressionEvaluationContext Unevaluated(
2236 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
2237 Sema::ReuseLambdaContextDecl);
2238
2239 return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
2240 OpTok.getLocation(),
2241 *Name, NameLoc,
2242 RParenLoc);
2243 }
2244
2245 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
2246 Diag(OpTok, diag::warn_cxx98_compat_alignof);
2247
2248 EnterExpressionEvaluationContext Unevaluated(
2249 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
2250 Sema::ReuseLambdaContextDecl);
2251
2252 bool isCastExpr;
2253 ParsedType CastTy;
2254 SourceRange CastRange;
2255 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
2256 isCastExpr,
2257 CastTy,
2258 CastRange);
2259
2260 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
2261 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
2262 ExprKind = UETT_AlignOf;
2263 else if (OpTok.is(tok::kw___alignof))
2264 ExprKind = UETT_PreferredAlignOf;
2265 else if (OpTok.is(tok::kw_vec_step))
2266 ExprKind = UETT_VecStep;
2267 else if (OpTok.is(tok::kw___builtin_omp_required_simd_align))
2268 ExprKind = UETT_OpenMPRequiredSimdAlign;
2269
2270 if (isCastExpr)
2271 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
2272 ExprKind,
2273 /*IsType=*/true,
2274 CastTy.getAsOpaquePtr(),
2275 CastRange);
2276
2277 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
2278 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
2279
2280 // If we get here, the operand to the sizeof/alignof was an expression.
2281 if (!Operand.isInvalid())
2282 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
2283 ExprKind,
2284 /*IsType=*/false,
2285 Operand.get(),
2286 CastRange);
2287 return Operand;
2288}
2289
2290/// ParseBuiltinPrimaryExpression
2291///
2292/// \verbatim
2293/// primary-expression: [C99 6.5.1]
2294/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
2295/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
2296/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
2297/// assign-expr ')'
2298/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
2299/// [GNU] '__builtin_FILE' '(' ')'
2300/// [GNU] '__builtin_FUNCTION' '(' ')'
2301/// [GNU] '__builtin_LINE' '(' ')'
2302/// [CLANG] '__builtin_COLUMN' '(' ')'
2303/// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')'
2304///
2305/// [GNU] offsetof-member-designator:
2306/// [GNU] identifier
2307/// [GNU] offsetof-member-designator '.' identifier
2308/// [GNU] offsetof-member-designator '[' expression ']'
2309/// \endverbatim
2310ExprResult Parser::ParseBuiltinPrimaryExpression() {
2311 ExprResult Res;
2312 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
2313
2314 tok::TokenKind T = Tok.getKind();
2315 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier.
2316
2317 // All of these start with an open paren.
2318 if (Tok.isNot(tok::l_paren))
2319 return ExprError(Diag(Tok, diag::err_expected_after) << BuiltinII
2320 << tok::l_paren);
2321
2322 BalancedDelimiterTracker PT(*this, tok::l_paren);
2323 PT.consumeOpen();
2324
2325 // TODO: Build AST.
2326
2327 switch (T) {
2328 default: llvm_unreachable("Not a builtin primary expression!")::llvm::llvm_unreachable_internal("Not a builtin primary expression!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2328)
;
2329 case tok::kw___builtin_va_arg: {
2330 ExprResult Expr(ParseAssignmentExpression());
2331
2332 if (ExpectAndConsume(tok::comma)) {
2333 SkipUntil(tok::r_paren, StopAtSemi);
2334 Expr = ExprError();
2335 }
2336
2337 TypeResult Ty = ParseTypeName();
2338
2339 if (Tok.isNot(tok::r_paren)) {
2340 Diag(Tok, diag::err_expected) << tok::r_paren;
2341 Expr = ExprError();
2342 }
2343
2344 if (Expr.isInvalid() || Ty.isInvalid())
2345 Res = ExprError();
2346 else
2347 Res = Actions.ActOnVAArg(StartLoc, Expr.get(), Ty.get(), ConsumeParen());
2348 break;
2349 }
2350 case tok::kw___builtin_offsetof: {
2351 SourceLocation TypeLoc = Tok.getLocation();
2352 TypeResult Ty = ParseTypeName();
2353 if (Ty.isInvalid()) {
2354 SkipUntil(tok::r_paren, StopAtSemi);
2355 return ExprError();
2356 }
2357
2358 if (ExpectAndConsume(tok::comma)) {
2359 SkipUntil(tok::r_paren, StopAtSemi);
2360 return ExprError();
2361 }
2362
2363 // We must have at least one identifier here.
2364 if (Tok.isNot(tok::identifier)) {
2365 Diag(Tok, diag::err_expected) << tok::identifier;
2366 SkipUntil(tok::r_paren, StopAtSemi);
2367 return ExprError();
2368 }
2369
2370 // Keep track of the various subcomponents we see.
2371 SmallVector<Sema::OffsetOfComponent, 4> Comps;
2372
2373 Comps.push_back(Sema::OffsetOfComponent());
2374 Comps.back().isBrackets = false;
2375 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
2376 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
2377
2378 // FIXME: This loop leaks the index expressions on error.
2379 while (1) {
2380 if (Tok.is(tok::period)) {
2381 // offsetof-member-designator: offsetof-member-designator '.' identifier
2382 Comps.push_back(Sema::OffsetOfComponent());
2383 Comps.back().isBrackets = false;
2384 Comps.back().LocStart = ConsumeToken();
2385
2386 if (Tok.isNot(tok::identifier)) {
2387 Diag(Tok, diag::err_expected) << tok::identifier;
2388 SkipUntil(tok::r_paren, StopAtSemi);
2389 return ExprError();
2390 }
2391 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
2392 Comps.back().LocEnd = ConsumeToken();
2393
2394 } else if (Tok.is(tok::l_square)) {
2395 if (CheckProhibitedCXX11Attribute())
2396 return ExprError();
2397
2398 // offsetof-member-designator: offsetof-member-design '[' expression ']'
2399 Comps.push_back(Sema::OffsetOfComponent());
2400 Comps.back().isBrackets = true;
2401 BalancedDelimiterTracker ST(*this, tok::l_square);
2402 ST.consumeOpen();
2403 Comps.back().LocStart = ST.getOpenLocation();
2404 Res = ParseExpression();
2405 if (Res.isInvalid()) {
2406 SkipUntil(tok::r_paren, StopAtSemi);
2407 return Res;
2408 }
2409 Comps.back().U.E = Res.get();
2410
2411 ST.consumeClose();
2412 Comps.back().LocEnd = ST.getCloseLocation();
2413 } else {
2414 if (Tok.isNot(tok::r_paren)) {
2415 PT.consumeClose();
2416 Res = ExprError();
2417 } else if (Ty.isInvalid()) {
2418 Res = ExprError();
2419 } else {
2420 PT.consumeClose();
2421 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
2422 Ty.get(), Comps,
2423 PT.getCloseLocation());
2424 }
2425 break;
2426 }
2427 }
2428 break;
2429 }
2430 case tok::kw___builtin_choose_expr: {
2431 ExprResult Cond(ParseAssignmentExpression());
2432 if (Cond.isInvalid()) {
2433 SkipUntil(tok::r_paren, StopAtSemi);
2434 return Cond;
2435 }
2436 if (ExpectAndConsume(tok::comma)) {
2437 SkipUntil(tok::r_paren, StopAtSemi);
2438 return ExprError();
2439 }
2440
2441 ExprResult Expr1(ParseAssignmentExpression());
2442 if (Expr1.isInvalid()) {
2443 SkipUntil(tok::r_paren, StopAtSemi);
2444 return Expr1;
2445 }
2446 if (ExpectAndConsume(tok::comma)) {
2447 SkipUntil(tok::r_paren, StopAtSemi);
2448 return ExprError();
2449 }
2450
2451 ExprResult Expr2(ParseAssignmentExpression());
2452 if (Expr2.isInvalid()) {
2453 SkipUntil(tok::r_paren, StopAtSemi);
2454 return Expr2;
2455 }
2456 if (Tok.isNot(tok::r_paren)) {
2457 Diag(Tok, diag::err_expected) << tok::r_paren;
2458 return ExprError();
2459 }
2460 Res = Actions.ActOnChooseExpr(StartLoc, Cond.get(), Expr1.get(),
2461 Expr2.get(), ConsumeParen());
2462 break;
2463 }
2464 case tok::kw___builtin_astype: {
2465 // The first argument is an expression to be converted, followed by a comma.
2466 ExprResult Expr(ParseAssignmentExpression());
2467 if (Expr.isInvalid()) {
2468 SkipUntil(tok::r_paren, StopAtSemi);
2469 return ExprError();
2470 }
2471
2472 if (ExpectAndConsume(tok::comma)) {
2473 SkipUntil(tok::r_paren, StopAtSemi);
2474 return ExprError();
2475 }
2476
2477 // Second argument is the type to bitcast to.
2478 TypeResult DestTy = ParseTypeName();
2479 if (DestTy.isInvalid())
2480 return ExprError();
2481
2482 // Attempt to consume the r-paren.
2483 if (Tok.isNot(tok::r_paren)) {
2484 Diag(Tok, diag::err_expected) << tok::r_paren;
2485 SkipUntil(tok::r_paren, StopAtSemi);
2486 return ExprError();
2487 }
2488
2489 Res = Actions.ActOnAsTypeExpr(Expr.get(), DestTy.get(), StartLoc,
2490 ConsumeParen());
2491 break;
2492 }
2493 case tok::kw___builtin_convertvector: {
2494 // The first argument is an expression to be converted, followed by a comma.
2495 ExprResult Expr(ParseAssignmentExpression());
2496 if (Expr.isInvalid()) {
2497 SkipUntil(tok::r_paren, StopAtSemi);
2498 return ExprError();
2499 }
2500
2501 if (ExpectAndConsume(tok::comma)) {
2502 SkipUntil(tok::r_paren, StopAtSemi);
2503 return ExprError();
2504 }
2505
2506 // Second argument is the type to bitcast to.
2507 TypeResult DestTy = ParseTypeName();
2508 if (DestTy.isInvalid())
2509 return ExprError();
2510
2511 // Attempt to consume the r-paren.
2512 if (Tok.isNot(tok::r_paren)) {
2513 Diag(Tok, diag::err_expected) << tok::r_paren;
2514 SkipUntil(tok::r_paren, StopAtSemi);
2515 return ExprError();
2516 }
2517
2518 Res = Actions.ActOnConvertVectorExpr(Expr.get(), DestTy.get(), StartLoc,
2519 ConsumeParen());
2520 break;
2521 }
2522 case tok::kw___builtin_COLUMN:
2523 case tok::kw___builtin_FILE:
2524 case tok::kw___builtin_FUNCTION:
2525 case tok::kw___builtin_LINE: {
2526 // Attempt to consume the r-paren.
2527 if (Tok.isNot(tok::r_paren)) {
2528 Diag(Tok, diag::err_expected) << tok::r_paren;
2529 SkipUntil(tok::r_paren, StopAtSemi);
2530 return ExprError();
2531 }
2532 SourceLocExpr::IdentKind Kind = [&] {
2533 switch (T) {
2534 case tok::kw___builtin_FILE:
2535 return SourceLocExpr::File;
2536 case tok::kw___builtin_FUNCTION:
2537 return SourceLocExpr::Function;
2538 case tok::kw___builtin_LINE:
2539 return SourceLocExpr::Line;
2540 case tok::kw___builtin_COLUMN:
2541 return SourceLocExpr::Column;
2542 default:
2543 llvm_unreachable("invalid keyword")::llvm::llvm_unreachable_internal("invalid keyword", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2543)
;
2544 }
2545 }();
2546 Res = Actions.ActOnSourceLocExpr(Kind, StartLoc, ConsumeParen());
2547 break;
2548 }
2549 }
2550
2551 if (Res.isInvalid())
2552 return ExprError();
2553
2554 // These can be followed by postfix-expr pieces because they are
2555 // primary-expressions.
2556 return ParsePostfixExpressionSuffix(Res.get());
2557}
2558
2559/// ParseParenExpression - This parses the unit that starts with a '(' token,
2560/// based on what is allowed by ExprType. The actual thing parsed is returned
2561/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
2562/// not the parsed cast-expression.
2563///
2564/// \verbatim
2565/// primary-expression: [C99 6.5.1]
2566/// '(' expression ')'
2567/// [GNU] '(' compound-statement ')' (if !ParenExprOnly)
2568/// postfix-expression: [C99 6.5.2]
2569/// '(' type-name ')' '{' initializer-list '}'
2570/// '(' type-name ')' '{' initializer-list ',' '}'
2571/// cast-expression: [C99 6.5.4]
2572/// '(' type-name ')' cast-expression
2573/// [ARC] bridged-cast-expression
2574/// [ARC] bridged-cast-expression:
2575/// (__bridge type-name) cast-expression
2576/// (__bridge_transfer type-name) cast-expression
2577/// (__bridge_retained type-name) cast-expression
2578/// fold-expression: [C++1z]
2579/// '(' cast-expression fold-operator '...' ')'
2580/// '(' '...' fold-operator cast-expression ')'
2581/// '(' cast-expression fold-operator '...'
2582/// fold-operator cast-expression ')'
2583/// \endverbatim
2584ExprResult
2585Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
2586 bool isTypeCast, ParsedType &CastTy,
2587 SourceLocation &RParenLoc) {
2588 assert(Tok.is(tok::l_paren) && "Not a paren expr!")((Tok.is(tok::l_paren) && "Not a paren expr!") ? static_cast
<void> (0) : __assert_fail ("Tok.is(tok::l_paren) && \"Not a paren expr!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2588, __PRETTY_FUNCTION__))
;
2589 ColonProtectionRAIIObject ColonProtection(*this, false);
2590 BalancedDelimiterTracker T(*this, tok::l_paren);
2591 if (T.consumeOpen())
2592 return ExprError();
2593 SourceLocation OpenLoc = T.getOpenLocation();
2594
2595 PreferredType.enterParenExpr(Tok.getLocation(), OpenLoc);
2596
2597 ExprResult Result(true);
2598 bool isAmbiguousTypeId;
2599 CastTy = nullptr;
2600
2601 if (Tok.is(tok::code_completion)) {
2602 Actions.CodeCompleteExpression(
2603 getCurScope(), PreferredType.get(Tok.getLocation()),
2604 /*IsParenthesized=*/ExprType >= CompoundLiteral);
2605 cutOffParsing();
2606 return ExprError();
2607 }
2608
2609 // Diagnose use of bridge casts in non-arc mode.
2610 bool BridgeCast = (getLangOpts().ObjC &&
2611 Tok.isOneOf(tok::kw___bridge,
2612 tok::kw___bridge_transfer,
2613 tok::kw___bridge_retained,
2614 tok::kw___bridge_retain));
2615 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
2616 if (!TryConsumeToken(tok::kw___bridge)) {
2617 StringRef BridgeCastName = Tok.getName();
2618 SourceLocation BridgeKeywordLoc = ConsumeToken();
2619 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2620 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
2621 << BridgeCastName
2622 << FixItHint::CreateReplacement(BridgeKeywordLoc, "");
2623 }
2624 BridgeCast = false;
2625 }
2626
2627 // None of these cases should fall through with an invalid Result
2628 // unless they've already reported an error.
2629 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
2630 Diag(Tok, diag::ext_gnu_statement_expr);
2631
2632 if (!getCurScope()->getFnParent() && !getCurScope()->getBlockParent()) {
2633 Result = ExprError(Diag(OpenLoc, diag::err_stmtexpr_file_scope));
2634 } else {
2635 // Find the nearest non-record decl context. Variables declared in a
2636 // statement expression behave as if they were declared in the enclosing
2637 // function, block, or other code construct.
2638 DeclContext *CodeDC = Actions.CurContext;
2639 while (CodeDC->isRecord() || isa<EnumDecl>(CodeDC)) {
2640 CodeDC = CodeDC->getParent();
2641 assert(CodeDC && !CodeDC->isFileContext() &&((CodeDC && !CodeDC->isFileContext() && "statement expr not in code context"
) ? static_cast<void> (0) : __assert_fail ("CodeDC && !CodeDC->isFileContext() && \"statement expr not in code context\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2642, __PRETTY_FUNCTION__))
2642 "statement expr not in code context")((CodeDC && !CodeDC->isFileContext() && "statement expr not in code context"
) ? static_cast<void> (0) : __assert_fail ("CodeDC && !CodeDC->isFileContext() && \"statement expr not in code context\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2642, __PRETTY_FUNCTION__))
;
2643 }
2644 Sema::ContextRAII SavedContext(Actions, CodeDC, /*NewThisContext=*/false);
2645
2646 Actions.ActOnStartStmtExpr();
2647
2648 StmtResult Stmt(ParseCompoundStatement(true));
2649 ExprType = CompoundStmt;
2650
2651 // If the substmt parsed correctly, build the AST node.
2652 if (!Stmt.isInvalid()) {
2653 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.get(), Tok.getLocation());
2654 } else {
2655 Actions.ActOnStmtExprError();
2656 }
2657 }
2658 } else if (ExprType >= CompoundLiteral && BridgeCast) {
2659 tok::TokenKind tokenKind = Tok.getKind();
2660 SourceLocation BridgeKeywordLoc = ConsumeToken();
2661
2662 // Parse an Objective-C ARC ownership cast expression.
2663 ObjCBridgeCastKind Kind;
2664 if (tokenKind == tok::kw___bridge)
2665 Kind = OBC_Bridge;
2666 else if (tokenKind == tok::kw___bridge_transfer)
2667 Kind = OBC_BridgeTransfer;
2668 else if (tokenKind == tok::kw___bridge_retained)
2669 Kind = OBC_BridgeRetained;
2670 else {
2671 // As a hopefully temporary workaround, allow __bridge_retain as
2672 // a synonym for __bridge_retained, but only in system headers.
2673 assert(tokenKind == tok::kw___bridge_retain)((tokenKind == tok::kw___bridge_retain) ? static_cast<void
> (0) : __assert_fail ("tokenKind == tok::kw___bridge_retain"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2673, __PRETTY_FUNCTION__))
;
2674 Kind = OBC_BridgeRetained;
2675 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2676 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
2677 << FixItHint::CreateReplacement(BridgeKeywordLoc,
2678 "__bridge_retained");
2679 }
2680
2681 TypeResult Ty = ParseTypeName();
2682 T.consumeClose();
2683 ColonProtection.restore();
2684 RParenLoc = T.getCloseLocation();
2685
2686 PreferredType.enterTypeCast(Tok.getLocation(), Ty.get().get());
2687 ExprResult SubExpr = ParseCastExpression(AnyCastExpr);
2688
2689 if (Ty.isInvalid() || SubExpr.isInvalid())
2690 return ExprError();
2691
2692 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
2693 BridgeKeywordLoc, Ty.get(),
2694 RParenLoc, SubExpr.get());
2695 } else if (ExprType >= CompoundLiteral &&
2696 isTypeIdInParens(isAmbiguousTypeId)) {
2697
2698 // Otherwise, this is a compound literal expression or cast expression.
2699
2700 // In C++, if the type-id is ambiguous we disambiguate based on context.
2701 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof
2702 // in which case we should treat it as type-id.
2703 // if stopIfCastExpr is false, we need to determine the context past the
2704 // parens, so we defer to ParseCXXAmbiguousParenExpression for that.
2705 if (isAmbiguousTypeId && !stopIfCastExpr) {
2706 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T,
2707 ColonProtection);
2708 RParenLoc = T.getCloseLocation();
2709 return res;
2710 }
2711
2712 // Parse the type declarator.
2713 DeclSpec DS(AttrFactory);
2714 ParseSpecifierQualifierList(DS);
2715 Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
2716 ParseDeclarator(DeclaratorInfo);
2717
2718 // If our type is followed by an identifier and either ':' or ']', then
2719 // this is probably an Objective-C message send where the leading '[' is
2720 // missing. Recover as if that were the case.
2721 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
2722 !InMessageExpression && getLangOpts().ObjC &&
2723 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
2724 TypeResult Ty;
2725 {
2726 InMessageExpressionRAIIObject InMessage(*this, false);
2727 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2728 }
2729 Result = ParseObjCMessageExpressionBody(SourceLocation(),
2730 SourceLocation(),
2731 Ty.get(), nullptr);
2732 } else {
2733 // Match the ')'.
2734 T.consumeClose();
2735 ColonProtection.restore();
2736 RParenLoc = T.getCloseLocation();
2737 if (Tok.is(tok::l_brace)) {
2738 ExprType = CompoundLiteral;
2739 TypeResult Ty;
2740 {
2741 InMessageExpressionRAIIObject InMessage(*this, false);
2742 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2743 }
2744 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
2745 }
2746
2747 if (Tok.is(tok::l_paren)) {
2748 // This could be OpenCL vector Literals
2749 if (getLangOpts().OpenCL)
2750 {
2751 TypeResult Ty;
2752 {
2753 InMessageExpressionRAIIObject InMessage(*this, false);
2754 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2755 }
2756 if(Ty.isInvalid())
2757 {
2758 return ExprError();
2759 }
2760 QualType QT = Ty.get().get().getCanonicalType();
2761 if (QT->isVectorType())
2762 {
2763 // We parsed '(' vector-type-name ')' followed by '('
2764
2765 // Parse the cast-expression that follows it next.
2766 // isVectorLiteral = true will make sure we don't parse any
2767 // Postfix expression yet
2768 Result = ParseCastExpression(/*isUnaryExpression=*/AnyCastExpr,
2769 /*isAddressOfOperand=*/false,
2770 /*isTypeCast=*/IsTypeCast,
2771 /*isVectorLiteral=*/true);
2772
2773 if (!Result.isInvalid()) {
2774 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2775 DeclaratorInfo, CastTy,
2776 RParenLoc, Result.get());
2777 }
2778
2779 // After we performed the cast we can check for postfix-expr pieces.
2780 if (!Result.isInvalid()) {
2781 Result = ParsePostfixExpressionSuffix(Result);
2782 }
2783
2784 return Result;
2785 }
2786 }
2787 }
2788
2789 if (ExprType == CastExpr) {
2790 // We parsed '(' type-name ')' and the thing after it wasn't a '{'.
2791
2792 if (DeclaratorInfo.isInvalidType())
2793 return ExprError();
2794
2795 // Note that this doesn't parse the subsequent cast-expression, it just
2796 // returns the parsed type to the callee.
2797 if (stopIfCastExpr) {
2798 TypeResult Ty;
2799 {
2800 InMessageExpressionRAIIObject InMessage(*this, false);
2801 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2802 }
2803 CastTy = Ty.get();
2804 return ExprResult();
2805 }
2806
2807 // Reject the cast of super idiom in ObjC.
2808 if (Tok.is(tok::identifier) && getLangOpts().ObjC &&
2809 Tok.getIdentifierInfo() == Ident_super &&
2810 getCurScope()->isInObjcMethodScope() &&
2811 GetLookAheadToken(1).isNot(tok::period)) {
2812 Diag(Tok.getLocation(), diag::err_illegal_super_cast)
2813 << SourceRange(OpenLoc, RParenLoc);
2814 return ExprError();
2815 }
2816
2817 PreferredType.enterTypeCast(Tok.getLocation(), CastTy.get());
2818 // Parse the cast-expression that follows it next.
2819 // TODO: For cast expression with CastTy.
2820 Result = ParseCastExpression(/*isUnaryExpression=*/AnyCastExpr,
2821 /*isAddressOfOperand=*/false,
2822 /*isTypeCast=*/IsTypeCast);
2823 if (!Result.isInvalid()) {
2824 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2825 DeclaratorInfo, CastTy,
2826 RParenLoc, Result.get());
2827 }
2828 return Result;
2829 }
2830
2831 Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
2832 return ExprError();
2833 }
2834 } else if (ExprType >= FoldExpr && Tok.is(tok::ellipsis) &&
2835 isFoldOperator(NextToken().getKind())) {
2836 ExprType = FoldExpr;
2837 return ParseFoldExpression(ExprResult(), T);
2838 } else if (isTypeCast) {
2839 // Parse the expression-list.
2840 InMessageExpressionRAIIObject InMessage(*this, false);
2841
2842 ExprVector ArgExprs;
2843 CommaLocsTy CommaLocs;
2844
2845 if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) {
2846 // FIXME: If we ever support comma expressions as operands to
2847 // fold-expressions, we'll need to allow multiple ArgExprs here.
2848 if (ExprType >= FoldExpr && ArgExprs.size() == 1 &&
2849 isFoldOperator(Tok.getKind()) && NextToken().is(tok::ellipsis)) {
2850 ExprType = FoldExpr;
2851 return ParseFoldExpression(ArgExprs[0], T);
2852 }
2853
2854 ExprType = SimpleExpr;
2855 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
2856 ArgExprs);
2857 }
2858 } else {
2859 InMessageExpressionRAIIObject InMessage(*this, false);
2860
2861 Result = ParseExpression(MaybeTypeCast);
2862 if (!getLangOpts().CPlusPlus && MaybeTypeCast && Result.isUsable()) {
2863 // Correct typos in non-C++ code earlier so that implicit-cast-like
2864 // expressions are parsed correctly.
2865 Result = Actions.CorrectDelayedTyposInExpr(Result);
2866 }
2867
2868 if (ExprType >= FoldExpr && isFoldOperator(Tok.getKind()) &&
2869 NextToken().is(tok::ellipsis)) {
2870 ExprType = FoldExpr;
2871 return ParseFoldExpression(Result, T);
2872 }
2873 ExprType = SimpleExpr;
2874
2875 // Don't build a paren expression unless we actually match a ')'.
2876 if (!Result.isInvalid() && Tok.is(tok::r_paren))
2877 Result =
2878 Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.get());
2879 }
2880
2881 // Match the ')'.
2882 if (Result.isInvalid()) {
2883 SkipUntil(tok::r_paren, StopAtSemi);
2884 return ExprError();
2885 }
2886
2887 T.consumeClose();
2888 RParenLoc = T.getCloseLocation();
2889 return Result;
2890}
2891
2892/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
2893/// and we are at the left brace.
2894///
2895/// \verbatim
2896/// postfix-expression: [C99 6.5.2]
2897/// '(' type-name ')' '{' initializer-list '}'
2898/// '(' type-name ')' '{' initializer-list ',' '}'
2899/// \endverbatim
2900ExprResult
2901Parser::ParseCompoundLiteralExpression(ParsedType Ty,
2902 SourceLocation LParenLoc,
2903 SourceLocation RParenLoc) {
2904 assert(Tok.is(tok::l_brace) && "Not a compound literal!")((Tok.is(tok::l_brace) && "Not a compound literal!") ?
static_cast<void> (0) : __assert_fail ("Tok.is(tok::l_brace) && \"Not a compound literal!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2904, __PRETTY_FUNCTION__))
;
2905 if (!getLangOpts().C99) // Compound literals don't exist in C90.
2906 Diag(LParenLoc, diag::ext_c99_compound_literal);
2907 ExprResult Result = ParseInitializer();
2908 if (!Result.isInvalid() && Ty)
2909 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.get());
2910 return Result;
2911}
2912
2913/// ParseStringLiteralExpression - This handles the various token types that
2914/// form string literals, and also handles string concatenation [C99 5.1.1.2,
2915/// translation phase #6].
2916///
2917/// \verbatim
2918/// primary-expression: [C99 6.5.1]
2919/// string-literal
2920/// \verbatim
2921ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
2922 assert(isTokenStringLiteral() && "Not a string literal!")((isTokenStringLiteral() && "Not a string literal!") ?
static_cast<void> (0) : __assert_fail ("isTokenStringLiteral() && \"Not a string literal!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2922, __PRETTY_FUNCTION__))
;
2923
2924 // String concat. Note that keywords like __func__ and __FUNCTION__ are not
2925 // considered to be strings for concatenation purposes.
2926 SmallVector<Token, 4> StringToks;
2927
2928 do {
2929 StringToks.push_back(Tok);
2930 ConsumeStringToken();
2931 } while (isTokenStringLiteral());
2932
2933 // Pass the set of string tokens, ready for concatenation, to the actions.
2934 return Actions.ActOnStringLiteral(StringToks,
2935 AllowUserDefinedLiteral ? getCurScope()
2936 : nullptr);
2937}
2938
2939/// ParseGenericSelectionExpression - Parse a C11 generic-selection
2940/// [C11 6.5.1.1].
2941///
2942/// \verbatim
2943/// generic-selection:
2944/// _Generic ( assignment-expression , generic-assoc-list )
2945/// generic-assoc-list:
2946/// generic-association
2947/// generic-assoc-list , generic-association
2948/// generic-association:
2949/// type-name : assignment-expression
2950/// default : assignment-expression
2951/// \endverbatim
2952ExprResult Parser::ParseGenericSelectionExpression() {
2953 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected")((Tok.is(tok::kw__Generic) && "_Generic keyword expected"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::kw__Generic) && \"_Generic keyword expected\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 2953, __PRETTY_FUNCTION__))
;
2954 if (!getLangOpts().C11)
2955 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
2956
2957 SourceLocation KeyLoc = ConsumeToken();
2958 BalancedDelimiterTracker T(*this, tok::l_paren);
2959 if (T.expectAndConsume())
2960 return ExprError();
2961
2962 ExprResult ControllingExpr;
2963 {
2964 // C11 6.5.1.1p3 "The controlling expression of a generic selection is
2965 // not evaluated."
2966 EnterExpressionEvaluationContext Unevaluated(
2967 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
2968 ControllingExpr =
2969 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
2970 if (ControllingExpr.isInvalid()) {
2971 SkipUntil(tok::r_paren, StopAtSemi);
2972 return ExprError();
2973 }
2974 }
2975
2976 if (ExpectAndConsume(tok::comma)) {
2977 SkipUntil(tok::r_paren, StopAtSemi);
2978 return ExprError();
2979 }
2980
2981 SourceLocation DefaultLoc;
2982 TypeVector Types;
2983 ExprVector Exprs;
2984 do {
2985 ParsedType Ty;
2986 if (Tok.is(tok::kw_default)) {
2987 // C11 6.5.1.1p2 "A generic selection shall have no more than one default
2988 // generic association."
2989 if (!DefaultLoc.isInvalid()) {
2990 Diag(Tok, diag::err_duplicate_default_assoc);
2991 Diag(DefaultLoc, diag::note_previous_default_assoc);
2992 SkipUntil(tok::r_paren, StopAtSemi);
2993 return ExprError();
2994 }
2995 DefaultLoc = ConsumeToken();
2996 Ty = nullptr;
2997 } else {
2998 ColonProtectionRAIIObject X(*this);
2999 TypeResult TR = ParseTypeName();
3000 if (TR.isInvalid()) {
3001 SkipUntil(tok::r_paren, StopAtSemi);
3002 return ExprError();
3003 }
3004 Ty = TR.get();
3005 }
3006 Types.push_back(Ty);
3007
3008 if (ExpectAndConsume(tok::colon)) {
3009 SkipUntil(tok::r_paren, StopAtSemi);
3010 return ExprError();
3011 }
3012
3013 // FIXME: These expressions should be parsed in a potentially potentially
3014 // evaluated context.
3015 ExprResult ER(
3016 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
3017 if (ER.isInvalid()) {
3018 SkipUntil(tok::r_paren, StopAtSemi);
3019 return ExprError();
3020 }
3021 Exprs.push_back(ER.get());
3022 } while (TryConsumeToken(tok::comma));
3023
3024 T.consumeClose();
3025 if (T.getCloseLocation().isInvalid())
3026 return ExprError();
3027
3028 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
3029 T.getCloseLocation(),
3030 ControllingExpr.get(),
3031 Types, Exprs);
3032}
3033
3034/// Parse A C++1z fold-expression after the opening paren and optional
3035/// left-hand-side expression.
3036///
3037/// \verbatim
3038/// fold-expression:
3039/// ( cast-expression fold-operator ... )
3040/// ( ... fold-operator cast-expression )
3041/// ( cast-expression fold-operator ... fold-operator cast-expression )
3042ExprResult Parser::ParseFoldExpression(ExprResult LHS,
3043 BalancedDelimiterTracker &T) {
3044 if (LHS.isInvalid()) {
3045 T.skipToEnd();
3046 return true;
3047 }
3048
3049 tok::TokenKind Kind = tok::unknown;
3050 SourceLocation FirstOpLoc;
3051 if (LHS.isUsable()) {
3052 Kind = Tok.getKind();
3053 assert(isFoldOperator(Kind) && "missing fold-operator")((isFoldOperator(Kind) && "missing fold-operator") ? static_cast
<void> (0) : __assert_fail ("isFoldOperator(Kind) && \"missing fold-operator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 3053, __PRETTY_FUNCTION__))
;
3054 FirstOpLoc = ConsumeToken();
3055 }
3056
3057 assert(Tok.is(tok::ellipsis) && "not a fold-expression")((Tok.is(tok::ellipsis) && "not a fold-expression") ?
static_cast<void> (0) : __assert_fail ("Tok.is(tok::ellipsis) && \"not a fold-expression\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 3057, __PRETTY_FUNCTION__))
;
3058 SourceLocation EllipsisLoc = ConsumeToken();
3059
3060 ExprResult RHS;
3061 if (Tok.isNot(tok::r_paren)) {
3062 if (!isFoldOperator(Tok.getKind()))
3063 return Diag(Tok.getLocation(), diag::err_expected_fold_operator);
3064
3065 if (Kind != tok::unknown && Tok.getKind() != Kind)
3066 Diag(Tok.getLocation(), diag::err_fold_operator_mismatch)
3067 << SourceRange(FirstOpLoc);
3068 Kind = Tok.getKind();
3069 ConsumeToken();
3070
3071 RHS = ParseExpression();
3072 if (RHS.isInvalid()) {
3073 T.skipToEnd();
3074 return true;
3075 }
3076 }
3077
3078 Diag(EllipsisLoc, getLangOpts().CPlusPlus17
3079 ? diag::warn_cxx14_compat_fold_expression
3080 : diag::ext_fold_expression);
3081
3082 T.consumeClose();
3083 return Actions.ActOnCXXFoldExpr(T.getOpenLocation(), LHS.get(), Kind,
3084 EllipsisLoc, RHS.get(), T.getCloseLocation());
3085}
3086
3087/// ParseExpressionList - Used for C/C++ (argument-)expression-list.
3088///
3089/// \verbatim
3090/// argument-expression-list:
3091/// assignment-expression
3092/// argument-expression-list , assignment-expression
3093///
3094/// [C++] expression-list:
3095/// [C++] assignment-expression
3096/// [C++] expression-list , assignment-expression
3097///
3098/// [C++0x] expression-list:
3099/// [C++0x] initializer-list
3100///
3101/// [C++0x] initializer-list
3102/// [C++0x] initializer-clause ...[opt]
3103/// [C++0x] initializer-list , initializer-clause ...[opt]
3104///
3105/// [C++0x] initializer-clause:
3106/// [C++0x] assignment-expression
3107/// [C++0x] braced-init-list
3108/// \endverbatim
3109bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
3110 SmallVectorImpl<SourceLocation> &CommaLocs,
3111 llvm::function_ref<void()> ExpressionStarts) {
3112 bool SawError = false;
3113 while (1) {
3114 if (ExpressionStarts)
3115 ExpressionStarts();
3116
3117 ExprResult Expr;
3118 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
3119 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
3120 Expr = ParseBraceInitializer();
3121 } else
3122 Expr = ParseAssignmentExpression();
3123
3124 if (Tok.is(tok::ellipsis))
3125 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
3126 if (Expr.isInvalid()) {
3127 SkipUntil(tok::comma, tok::r_paren, StopBeforeMatch);
3128 SawError = true;
3129 } else {
3130 Exprs.push_back(Expr.get());
3131 }
3132
3133 if (Tok.isNot(tok::comma))
3134 break;
3135 // Move to the next argument, remember where the comma was.
3136 Token Comma = Tok;
3137 CommaLocs.push_back(ConsumeToken());
3138
3139 checkPotentialAngleBracketDelimiter(Comma);
3140 }
3141 if (SawError) {
3142 // Ensure typos get diagnosed when errors were encountered while parsing the
3143 // expression list.
3144 for (auto &E : Exprs) {
3145 ExprResult Expr = Actions.CorrectDelayedTyposInExpr(E);
3146 if (Expr.isUsable()) E = Expr.get();
3147 }
3148 }
3149 return SawError;
3150}
3151
3152/// ParseSimpleExpressionList - A simple comma-separated list of expressions,
3153/// used for misc language extensions.
3154///
3155/// \verbatim
3156/// simple-expression-list:
3157/// assignment-expression
3158/// simple-expression-list , assignment-expression
3159/// \endverbatim
3160bool
3161Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
3162 SmallVectorImpl<SourceLocation> &CommaLocs) {
3163 while (1) {
3164 ExprResult Expr = ParseAssignmentExpression();
3165 if (Expr.isInvalid())
3166 return true;
3167
3168 Exprs.push_back(Expr.get());
3169
3170 if (Tok.isNot(tok::comma))
3171 return false;
3172
3173 // Move to the next argument, remember where the comma was.
3174 Token Comma = Tok;
3175 CommaLocs.push_back(ConsumeToken());
3176
3177 checkPotentialAngleBracketDelimiter(Comma);
3178 }
3179}
3180
3181/// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
3182///
3183/// \verbatim
3184/// [clang] block-id:
3185/// [clang] specifier-qualifier-list block-declarator
3186/// \endverbatim
3187void Parser::ParseBlockId(SourceLocation CaretLoc) {
3188 if (Tok.is(tok::code_completion)) {
3189 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
3190 return cutOffParsing();
3191 }
3192
3193 // Parse the specifier-qualifier-list piece.
3194 DeclSpec DS(AttrFactory);
3195 ParseSpecifierQualifierList(DS);
3196
3197 // Parse the block-declarator.
3198 Declarator DeclaratorInfo(DS, DeclaratorContext::BlockLiteralContext);
3199 DeclaratorInfo.setFunctionDefinitionKind(FDK_Definition);
3200 ParseDeclarator(DeclaratorInfo);
3201
3202 MaybeParseGNUAttributes(DeclaratorInfo);
3203
3204 // Inform sema that we are starting a block.
3205 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
3206}
3207
3208/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
3209/// like ^(int x){ return x+1; }
3210///
3211/// \verbatim
3212/// block-literal:
3213/// [clang] '^' block-args[opt] compound-statement
3214/// [clang] '^' block-id compound-statement
3215/// [clang] block-args:
3216/// [clang] '(' parameter-list ')'
3217/// \endverbatim
3218ExprResult Parser::ParseBlockLiteralExpression() {
3219 assert(Tok.is(tok::caret) && "block literal starts with ^")((Tok.is(tok::caret) && "block literal starts with ^"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::caret) && \"block literal starts with ^\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 3219, __PRETTY_FUNCTION__))
;
3220 SourceLocation CaretLoc = ConsumeToken();
3221
3222 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
3223 "block literal parsing");
3224
3225 // Enter a scope to hold everything within the block. This includes the
3226 // argument decls, decls within the compound expression, etc. This also
3227 // allows determining whether a variable reference inside the block is
3228 // within or outside of the block.
3229 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
3230 Scope::CompoundStmtScope | Scope::DeclScope);
3231
3232 // Inform sema that we are starting a block.
3233 Actions.ActOnBlockStart(CaretLoc, getCurScope());
3234
3235 // Parse the return type if present.
3236 DeclSpec DS(AttrFactory);
3237 Declarator ParamInfo(DS, DeclaratorContext::BlockLiteralContext);
3238 ParamInfo.setFunctionDefinitionKind(FDK_Definition);
3239 // FIXME: Since the return type isn't actually parsed, it can't be used to
3240 // fill ParamInfo with an initial valid range, so do it manually.
3241 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
3242
3243 // If this block has arguments, parse them. There is no ambiguity here with
3244 // the expression case, because the expression case requires a parameter list.
3245 if (Tok.is(tok::l_paren)) {
3246 ParseParenDeclarator(ParamInfo);
3247 // Parse the pieces after the identifier as if we had "int(...)".
3248 // SetIdentifier sets the source range end, but in this case we're past
3249 // that location.
3250 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
3251 ParamInfo.SetIdentifier(nullptr, CaretLoc);
3252 ParamInfo.SetRangeEnd(Tmp);
3253 if (ParamInfo.isInvalidType()) {
3254 // If there was an error parsing the arguments, they may have
3255 // tried to use ^(x+y) which requires an argument list. Just
3256 // skip the whole block literal.
3257 Actions.ActOnBlockError(CaretLoc, getCurScope());
3258 return ExprError();
3259 }
3260
3261 MaybeParseGNUAttributes(ParamInfo);
3262
3263 // Inform sema that we are starting a block.
3264 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
3265 } else if (!Tok.is(tok::l_brace)) {
3266 ParseBlockId(CaretLoc);
3267 } else {
3268 // Otherwise, pretend we saw (void).
3269 SourceLocation NoLoc;
3270 ParamInfo.AddTypeInfo(
3271 DeclaratorChunk::getFunction(/*HasProto=*/true,
3272 /*IsAmbiguous=*/false,
3273 /*RParenLoc=*/NoLoc,
3274 /*ArgInfo=*/nullptr,
3275 /*NumParams=*/0,
3276 /*EllipsisLoc=*/NoLoc,
3277 /*RParenLoc=*/NoLoc,
3278 /*RefQualifierIsLvalueRef=*/true,
3279 /*RefQualifierLoc=*/NoLoc,
3280 /*MutableLoc=*/NoLoc, EST_None,
3281 /*ESpecRange=*/SourceRange(),
3282 /*Exceptions=*/nullptr,
3283 /*ExceptionRanges=*/nullptr,
3284 /*NumExceptions=*/0,
3285 /*NoexceptExpr=*/nullptr,
3286 /*ExceptionSpecTokens=*/nullptr,
3287 /*DeclsInPrototype=*/None, CaretLoc,
3288 CaretLoc, ParamInfo),
3289 CaretLoc);
3290
3291 MaybeParseGNUAttributes(ParamInfo);
3292
3293 // Inform sema that we are starting a block.
3294 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
3295 }
3296
3297
3298 ExprResult Result(true);
3299 if (!Tok.is(tok::l_brace)) {
3300 // Saw something like: ^expr
3301 Diag(Tok, diag::err_expected_expression);
3302 Actions.ActOnBlockError(CaretLoc, getCurScope());
3303 return ExprError();
3304 }
3305
3306 StmtResult Stmt(ParseCompoundStatementBody());
3307 BlockScope.Exit();
3308 if (!Stmt.isInvalid())
3309 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.get(), getCurScope());
3310 else
3311 Actions.ActOnBlockError(CaretLoc, getCurScope());
3312 return Result;
3313}
3314
3315/// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
3316///
3317/// '__objc_yes'
3318/// '__objc_no'
3319ExprResult Parser::ParseObjCBoolLiteral() {
3320 tok::TokenKind Kind = Tok.getKind();
3321 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);
3322}
3323
3324/// Validate availability spec list, emitting diagnostics if necessary. Returns
3325/// true if invalid.
3326static bool CheckAvailabilitySpecList(Parser &P,
3327 ArrayRef<AvailabilitySpec> AvailSpecs) {
3328 llvm::SmallSet<StringRef, 4> Platforms;
3329 bool HasOtherPlatformSpec = false;
3330 bool Valid = true;
3331 for (const auto &Spec : AvailSpecs) {
3332 if (Spec.isOtherPlatformSpec()) {
3333 if (HasOtherPlatformSpec) {
3334 P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_star);
3335 Valid = false;
3336 }
3337
3338 HasOtherPlatformSpec = true;
3339 continue;
3340 }
3341
3342 bool Inserted = Platforms.insert(Spec.getPlatform()).second;
3343 if (!Inserted) {
3344 // Rule out multiple version specs referring to the same platform.
3345 // For example, we emit an error for:
3346 // @available(macos 10.10, macos 10.11, *)
3347 StringRef Platform = Spec.getPlatform();
3348 P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_platform)
3349 << Spec.getEndLoc() << Platform;
3350 Valid = false;
3351 }
3352 }
3353
3354 if (!HasOtherPlatformSpec) {
3355 SourceLocation InsertWildcardLoc = AvailSpecs.back().getEndLoc();
3356 P.Diag(InsertWildcardLoc, diag::err_availability_query_wildcard_required)
3357 << FixItHint::CreateInsertion(InsertWildcardLoc, ", *");
3358 return true;
3359 }
3360
3361 return !Valid;
3362}
3363
3364/// Parse availability query specification.
3365///
3366/// availability-spec:
3367/// '*'
3368/// identifier version-tuple
3369Optional<AvailabilitySpec> Parser::ParseAvailabilitySpec() {
3370 if (Tok.is(tok::star)) {
3371 return AvailabilitySpec(ConsumeToken());
3372 } else {
3373 // Parse the platform name.
3374 if (Tok.is(tok::code_completion)) {
3375 Actions.CodeCompleteAvailabilityPlatformName();
3376 cutOffParsing();
3377 return None;
3378 }
3379 if (Tok.isNot(tok::identifier)) {
3380 Diag(Tok, diag::err_avail_query_expected_platform_name);
3381 return None;
3382 }
3383
3384 IdentifierLoc *PlatformIdentifier = ParseIdentifierLoc();
3385 SourceRange VersionRange;
3386 VersionTuple Version = ParseVersionTuple(VersionRange);
3387
3388 if (Version.empty())
3389 return None;
3390
3391 StringRef GivenPlatform = PlatformIdentifier->Ident->getName();
3392 StringRef Platform =
3393 AvailabilityAttr::canonicalizePlatformName(GivenPlatform);
3394
3395 if (AvailabilityAttr::getPrettyPlatformName(Platform).empty()) {
3396 Diag(PlatformIdentifier->Loc,
3397 diag::err_avail_query_unrecognized_platform_name)
3398 << GivenPlatform;
3399 return None;
3400 }
3401
3402 return AvailabilitySpec(Version, Platform, PlatformIdentifier->Loc,
3403 VersionRange.getEnd());
3404 }
3405}
3406
3407ExprResult Parser::ParseAvailabilityCheckExpr(SourceLocation BeginLoc) {
3408 assert(Tok.is(tok::kw___builtin_available) ||((Tok.is(tok::kw___builtin_available) || Tok.isObjCAtKeyword(
tok::objc_available)) ? static_cast<void> (0) : __assert_fail
("Tok.is(tok::kw___builtin_available) || Tok.isObjCAtKeyword(tok::objc_available)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 3409, __PRETTY_FUNCTION__))
3409 Tok.isObjCAtKeyword(tok::objc_available))((Tok.is(tok::kw___builtin_available) || Tok.isObjCAtKeyword(
tok::objc_available)) ? static_cast<void> (0) : __assert_fail
("Tok.is(tok::kw___builtin_available) || Tok.isObjCAtKeyword(tok::objc_available)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Parse/ParseExpr.cpp"
, 3409, __PRETTY_FUNCTION__))
;
3410
3411 // Eat the available or __builtin_available.
3412 ConsumeToken();
3413
3414 BalancedDelimiterTracker Parens(*this, tok::l_paren);
3415 if (Parens.expectAndConsume())
3416 return ExprError();
3417
3418 SmallVector<AvailabilitySpec, 4> AvailSpecs;
3419 bool HasError = false;
3420 while (true) {
3421 Optional<AvailabilitySpec> Spec = ParseAvailabilitySpec();
3422 if (!Spec)
3423 HasError = true;
3424 else
3425 AvailSpecs.push_back(*Spec);
3426
3427 if (!TryConsumeToken(tok::comma))
3428 break;
3429 }
3430
3431 if (HasError) {
3432 SkipUntil(tok::r_paren, StopAtSemi);
3433 return ExprError();
3434 }
3435
3436 CheckAvailabilitySpecList(*this, AvailSpecs);
3437
3438 if (Parens.consumeClose())
3439 return ExprError();
3440
3441 return Actions.ActOnObjCAvailabilityCheckExpr(AvailSpecs, BeginLoc,
3442 Parens.getCloseLocation());
3443}