| //===--- ParseStmt.cpp - Statement and Block Parser -----------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Statement and Block portions of the Parser |
| // interface. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/AST/PrettyDeclStackTrace.h" |
| #include "clang/Basic/Attributes.h" |
| #include "clang/Basic/PrettyStackTrace.h" |
| #include "clang/Parse/LoopHint.h" |
| #include "clang/Parse/Parser.h" |
| #include "clang/Parse/RAIIObjectsForParser.h" |
| #include "clang/Sema/DeclSpec.h" |
| #include "clang/Sema/Scope.h" |
| #include "clang/Sema/TypoCorrection.h" |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // C99 6.8: Statements and Blocks. |
| //===----------------------------------------------------------------------===// |
| |
| /// Parse a standalone statement (for instance, as the body of an 'if', |
| /// 'while', or 'for'). |
| StmtResult Parser::ParseStatement(SourceLocation *TrailingElseLoc, |
| ParsedStmtContext StmtCtx) { |
| StmtResult Res; |
| |
| // We may get back a null statement if we found a #pragma. Keep going until |
| // we get an actual statement. |
| do { |
| StmtVector Stmts; |
| Res = ParseStatementOrDeclaration(Stmts, StmtCtx, TrailingElseLoc); |
| } while (!Res.isInvalid() && !Res.get()); |
| |
| return Res; |
| } |
| |
| /// ParseStatementOrDeclaration - Read 'statement' or 'declaration'. |
| /// StatementOrDeclaration: |
| /// statement |
| /// declaration |
| /// |
| /// statement: |
| /// labeled-statement |
| /// compound-statement |
| /// expression-statement |
| /// selection-statement |
| /// iteration-statement |
| /// jump-statement |
| /// [C++] declaration-statement |
| /// [C++] try-block |
| /// [MS] seh-try-block |
| /// [OBC] objc-throw-statement |
| /// [OBC] objc-try-catch-statement |
| /// [OBC] objc-synchronized-statement |
| /// [GNU] asm-statement |
| /// [OMP] openmp-construct [TODO] |
| /// |
| /// labeled-statement: |
| /// identifier ':' statement |
| /// 'case' constant-expression ':' statement |
| /// 'default' ':' statement |
| /// |
| /// selection-statement: |
| /// if-statement |
| /// switch-statement |
| /// |
| /// iteration-statement: |
| /// while-statement |
| /// do-statement |
| /// for-statement |
| /// |
| /// expression-statement: |
| /// expression[opt] ';' |
| /// |
| /// jump-statement: |
| /// 'goto' identifier ';' |
| /// 'continue' ';' |
| /// 'break' ';' |
| /// 'return' expression[opt] ';' |
| /// [GNU] 'goto' '*' expression ';' |
| /// |
| /// [OBC] objc-throw-statement: |
| /// [OBC] '@' 'throw' expression ';' |
| /// [OBC] '@' 'throw' ';' |
| /// |
| StmtResult |
| Parser::ParseStatementOrDeclaration(StmtVector &Stmts, |
| ParsedStmtContext StmtCtx, |
| SourceLocation *TrailingElseLoc) { |
| |
| ParenBraceBracketBalancer BalancerRAIIObj(*this); |
| |
| ParsedAttributesWithRange Attrs(AttrFactory); |
| MaybeParseCXX11Attributes(Attrs, nullptr, /*MightBeObjCMessageSend*/ true); |
| if (!MaybeParseOpenCLUnrollHintAttribute(Attrs)) |
| return StmtError(); |
| |
| StmtResult Res = ParseStatementOrDeclarationAfterAttributes( |
| Stmts, StmtCtx, TrailingElseLoc, Attrs); |
| MaybeDestroyTemplateIds(); |
| |
| assert((Attrs.empty() || Res.isInvalid() || Res.isUsable()) && |
| "attributes on empty statement"); |
| |
| if (Attrs.empty() || Res.isInvalid()) |
| return Res; |
| |
| return Actions.ProcessStmtAttributes(Res.get(), Attrs, Attrs.Range); |
| } |
| |
| namespace { |
| class StatementFilterCCC final : public CorrectionCandidateCallback { |
| public: |
| StatementFilterCCC(Token nextTok) : NextToken(nextTok) { |
| WantTypeSpecifiers = nextTok.isOneOf(tok::l_paren, tok::less, tok::l_square, |
| tok::identifier, tok::star, tok::amp); |
| WantExpressionKeywords = |
| nextTok.isOneOf(tok::l_paren, tok::identifier, tok::arrow, tok::period); |
| WantRemainingKeywords = |
| nextTok.isOneOf(tok::l_paren, tok::semi, tok::identifier, tok::l_brace); |
| WantCXXNamedCasts = false; |
| } |
| |
| bool ValidateCandidate(const TypoCorrection &candidate) override { |
| if (FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>()) |
| return !candidate.getCorrectionSpecifier() || isa<ObjCIvarDecl>(FD); |
| if (NextToken.is(tok::equal)) |
| return candidate.getCorrectionDeclAs<VarDecl>(); |
| if (NextToken.is(tok::period) && |
| candidate.getCorrectionDeclAs<NamespaceDecl>()) |
| return false; |
| return CorrectionCandidateCallback::ValidateCandidate(candidate); |
| } |
| |
| std::unique_ptr<CorrectionCandidateCallback> clone() override { |
| return std::make_unique<StatementFilterCCC>(*this); |
| } |
| |
| private: |
| Token NextToken; |
| }; |
| } |
| |
| StmtResult Parser::ParseStatementOrDeclarationAfterAttributes( |
| StmtVector &Stmts, ParsedStmtContext StmtCtx, |
| SourceLocation *TrailingElseLoc, ParsedAttributesWithRange &Attrs) { |
| const char *SemiError = nullptr; |
| StmtResult Res; |
| SourceLocation GNUAttributeLoc; |
| |
| // Cases in this switch statement should fall through if the parser expects |
| // the token to end in a semicolon (in which case SemiError should be set), |
| // or they directly 'return;' if not. |
| Retry: |
| tok::TokenKind Kind = Tok.getKind(); |
| SourceLocation AtLoc; |
| switch (Kind) { |
| case tok::at: // May be a @try or @throw statement |
| { |
| ProhibitAttributes(Attrs); // TODO: is it correct? |
| AtLoc = ConsumeToken(); // consume @ |
| return ParseObjCAtStatement(AtLoc, StmtCtx); |
| } |
| |
| case tok::code_completion: |
| Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Statement); |
| cutOffParsing(); |
| return StmtError(); |
| |
| case tok::identifier: { |
| Token Next = NextToken(); |
| if (Next.is(tok::colon)) { // C99 6.8.1: labeled-statement |
| // identifier ':' statement |
| return ParseLabeledStatement(Attrs, StmtCtx); |
| } |
| |
| // Look up the identifier, and typo-correct it to a keyword if it's not |
| // found. |
| if (Next.isNot(tok::coloncolon)) { |
| // Try to limit which sets of keywords should be included in typo |
| // correction based on what the next token is. |
| StatementFilterCCC CCC(Next); |
| if (TryAnnotateName(&CCC) == ANK_Error) { |
| // Handle errors here by skipping up to the next semicolon or '}', and |
| // eat the semicolon if that's what stopped us. |
| SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| return StmtError(); |
| } |
| |
| // If the identifier was typo-corrected, try again. |
| if (Tok.isNot(tok::identifier)) |
| goto Retry; |
| } |
| |
| // Fall through |
| LLVM_FALLTHROUGH; |
| } |
| |
| default: { |
| if ((getLangOpts().CPlusPlus || getLangOpts().MicrosoftExt || |
| (StmtCtx & ParsedStmtContext::AllowDeclarationsInC) != |
| ParsedStmtContext()) && |
| (GNUAttributeLoc.isValid() || isDeclarationStatement())) { |
| SourceLocation DeclStart = Tok.getLocation(), DeclEnd; |
| DeclGroupPtrTy Decl; |
| if (GNUAttributeLoc.isValid()) { |
| DeclStart = GNUAttributeLoc; |
| Decl = ParseDeclaration(DeclaratorContext::BlockContext, DeclEnd, Attrs, |
| &GNUAttributeLoc); |
| } else { |
| Decl = |
| ParseDeclaration(DeclaratorContext::BlockContext, DeclEnd, Attrs); |
| } |
| if (Attrs.Range.getBegin().isValid()) |
| DeclStart = Attrs.Range.getBegin(); |
| return Actions.ActOnDeclStmt(Decl, DeclStart, DeclEnd); |
| } |
| |
| if (Tok.is(tok::r_brace)) { |
| Diag(Tok, diag::err_expected_statement); |
| return StmtError(); |
| } |
| |
| return ParseExprStatement(StmtCtx); |
| } |
| |
| case tok::kw___attribute: { |
| GNUAttributeLoc = Tok.getLocation(); |
| ParseGNUAttributes(Attrs); |
| goto Retry; |
| } |
| |
| case tok::kw_case: // C99 6.8.1: labeled-statement |
| return ParseCaseStatement(StmtCtx); |
| case tok::kw_default: // C99 6.8.1: labeled-statement |
| return ParseDefaultStatement(StmtCtx); |
| |
| case tok::l_brace: // C99 6.8.2: compound-statement |
| return ParseCompoundStatement(); |
| case tok::semi: { // C99 6.8.3p3: expression[opt] ';' |
| bool HasLeadingEmptyMacro = Tok.hasLeadingEmptyMacro(); |
| return Actions.ActOnNullStmt(ConsumeToken(), HasLeadingEmptyMacro); |
| } |
| |
| case tok::kw_if: // C99 6.8.4.1: if-statement |
| return ParseIfStatement(TrailingElseLoc); |
| case tok::kw_switch: // C99 6.8.4.2: switch-statement |
| return ParseSwitchStatement(TrailingElseLoc); |
| |
| case tok::kw_while: // C99 6.8.5.1: while-statement |
| return ParseWhileStatement(TrailingElseLoc); |
| case tok::kw_do: // C99 6.8.5.2: do-statement |
| Res = ParseDoStatement(); |
| SemiError = "do/while"; |
| break; |
| case tok::kw_for: // C99 6.8.5.3: for-statement |
| return ParseForStatement(TrailingElseLoc); |
| |
| case tok::kw_goto: // C99 6.8.6.1: goto-statement |
| Res = ParseGotoStatement(); |
| SemiError = "goto"; |
| break; |
| case tok::kw_continue: // C99 6.8.6.2: continue-statement |
| Res = ParseContinueStatement(); |
| SemiError = "continue"; |
| break; |
| case tok::kw_break: // C99 6.8.6.3: break-statement |
| Res = ParseBreakStatement(); |
| SemiError = "break"; |
| break; |
| case tok::kw_return: // C99 6.8.6.4: return-statement |
| Res = ParseReturnStatement(); |
| SemiError = "return"; |
| break; |
| case tok::kw_co_return: // C++ Coroutines: co_return statement |
| Res = ParseReturnStatement(); |
| SemiError = "co_return"; |
| break; |
| |
| case tok::kw_asm: { |
| ProhibitAttributes(Attrs); |
| bool msAsm = false; |
| Res = ParseAsmStatement(msAsm); |
| Res = Actions.ActOnFinishFullStmt(Res.get()); |
| if (msAsm) return Res; |
| SemiError = "asm"; |
| break; |
| } |
| |
| case tok::kw___if_exists: |
| case tok::kw___if_not_exists: |
| ProhibitAttributes(Attrs); |
| ParseMicrosoftIfExistsStatement(Stmts); |
| // An __if_exists block is like a compound statement, but it doesn't create |
| // a new scope. |
| return StmtEmpty(); |
| |
| case tok::kw_try: // C++ 15: try-block |
| return ParseCXXTryBlock(); |
| |
| case tok::kw___try: |
| ProhibitAttributes(Attrs); // TODO: is it correct? |
| return ParseSEHTryBlock(); |
| |
| case tok::kw___leave: |
| Res = ParseSEHLeaveStatement(); |
| SemiError = "__leave"; |
| break; |
| |
| case tok::annot_pragma_vis: |
| ProhibitAttributes(Attrs); |
| HandlePragmaVisibility(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_pack: |
| ProhibitAttributes(Attrs); |
| HandlePragmaPack(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_msstruct: |
| ProhibitAttributes(Attrs); |
| HandlePragmaMSStruct(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_align: |
| ProhibitAttributes(Attrs); |
| HandlePragmaAlign(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_weak: |
| ProhibitAttributes(Attrs); |
| HandlePragmaWeak(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_weakalias: |
| ProhibitAttributes(Attrs); |
| HandlePragmaWeakAlias(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_redefine_extname: |
| ProhibitAttributes(Attrs); |
| HandlePragmaRedefineExtname(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_fp_contract: |
| ProhibitAttributes(Attrs); |
| Diag(Tok, diag::err_pragma_file_or_compound_scope) << "fp_contract"; |
| ConsumeAnnotationToken(); |
| return StmtError(); |
| |
| case tok::annot_pragma_fp: |
| ProhibitAttributes(Attrs); |
| Diag(Tok, diag::err_pragma_file_or_compound_scope) << "clang fp"; |
| ConsumeAnnotationToken(); |
| return StmtError(); |
| |
| case tok::annot_pragma_fenv_access: |
| ProhibitAttributes(Attrs); |
| HandlePragmaFEnvAccess(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_fenv_round: |
| ProhibitAttributes(Attrs); |
| Diag(Tok, diag::err_pragma_file_or_compound_scope) << "STDC FENV_ROUND"; |
| ConsumeAnnotationToken(); |
| return StmtError(); |
| |
| case tok::annot_pragma_float_control: |
| ProhibitAttributes(Attrs); |
| Diag(Tok, diag::err_pragma_file_or_compound_scope) << "float_control"; |
| ConsumeAnnotationToken(); |
| return StmtError(); |
| |
| case tok::annot_pragma_opencl_extension: |
| ProhibitAttributes(Attrs); |
| HandlePragmaOpenCLExtension(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_captured: |
| ProhibitAttributes(Attrs); |
| return HandlePragmaCaptured(); |
| |
| case tok::annot_pragma_openmp: |
| ProhibitAttributes(Attrs); |
| return ParseOpenMPDeclarativeOrExecutableDirective(StmtCtx); |
| |
| case tok::annot_pragma_ms_pointers_to_members: |
| ProhibitAttributes(Attrs); |
| HandlePragmaMSPointersToMembers(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_ms_pragma: |
| ProhibitAttributes(Attrs); |
| HandlePragmaMSPragma(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_ms_vtordisp: |
| ProhibitAttributes(Attrs); |
| HandlePragmaMSVtorDisp(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_loop_hint: |
| ProhibitAttributes(Attrs); |
| return ParsePragmaLoopHint(Stmts, StmtCtx, TrailingElseLoc, Attrs); |
| |
| case tok::annot_pragma_dump: |
| HandlePragmaDump(); |
| return StmtEmpty(); |
| |
| case tok::annot_pragma_attribute: |
| HandlePragmaAttribute(); |
| return StmtEmpty(); |
| } |
| |
| // If we reached this code, the statement must end in a semicolon. |
| if (!TryConsumeToken(tok::semi) && !Res.isInvalid()) { |
| // If the result was valid, then we do want to diagnose this. Use |
| // ExpectAndConsume to emit the diagnostic, even though we know it won't |
| // succeed. |
| ExpectAndConsume(tok::semi, diag::err_expected_semi_after_stmt, SemiError); |
| // Skip until we see a } or ;, but don't eat it. |
| SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); |
| } |
| |
| return Res; |
| } |
| |
| /// Parse an expression statement. |
| StmtResult Parser::ParseExprStatement(ParsedStmtContext StmtCtx) { |
| // If a case keyword is missing, this is where it should be inserted. |
| Token OldToken = Tok; |
| |
| ExprStatementTokLoc = Tok.getLocation(); |
| |
| // expression[opt] ';' |
| ExprResult Expr(ParseExpression()); |
| if (Expr.isInvalid()) { |
| // If the expression is invalid, skip ahead to the next semicolon or '}'. |
| // Not doing this opens us up to the possibility of infinite loops if |
| // ParseExpression does not consume any tokens. |
| SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| return Actions.ActOnExprStmtError(); |
| } |
| |
| if (Tok.is(tok::colon) && getCurScope()->isSwitchScope() && |
| Actions.CheckCaseExpression(Expr.get())) { |
| // If a constant expression is followed by a colon inside a switch block, |
| // suggest a missing case keyword. |
| Diag(OldToken, diag::err_expected_case_before_expression) |
| << FixItHint::CreateInsertion(OldToken.getLocation(), "case "); |
| |
| // Recover parsing as a case statement. |
| return ParseCaseStatement(StmtCtx, /*MissingCase=*/true, Expr); |
| } |
| |
| // Otherwise, eat the semicolon. |
| ExpectAndConsumeSemi(diag::err_expected_semi_after_expr); |
| return handleExprStmt(Expr, StmtCtx); |
| } |
| |
| /// ParseSEHTryBlockCommon |
| /// |
| /// seh-try-block: |
| /// '__try' compound-statement seh-handler |
| /// |
| /// seh-handler: |
| /// seh-except-block |
| /// seh-finally-block |
| /// |
| StmtResult Parser::ParseSEHTryBlock() { |
| assert(Tok.is(tok::kw___try) && "Expected '__try'"); |
| SourceLocation TryLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected) << tok::l_brace); |
| |
| StmtResult TryBlock(ParseCompoundStatement( |
| /*isStmtExpr=*/false, |
| Scope::DeclScope | Scope::CompoundStmtScope | Scope::SEHTryScope)); |
| if (TryBlock.isInvalid()) |
| return TryBlock; |
| |
| StmtResult Handler; |
| if (Tok.is(tok::identifier) && |
| Tok.getIdentifierInfo() == getSEHExceptKeyword()) { |
| SourceLocation Loc = ConsumeToken(); |
| Handler = ParseSEHExceptBlock(Loc); |
| } else if (Tok.is(tok::kw___finally)) { |
| SourceLocation Loc = ConsumeToken(); |
| Handler = ParseSEHFinallyBlock(Loc); |
| } else { |
| return StmtError(Diag(Tok, diag::err_seh_expected_handler)); |
| } |
| |
| if(Handler.isInvalid()) |
| return Handler; |
| |
| return Actions.ActOnSEHTryBlock(false /* IsCXXTry */, |
| TryLoc, |
| TryBlock.get(), |
| Handler.get()); |
| } |
| |
| /// ParseSEHExceptBlock - Handle __except |
| /// |
| /// seh-except-block: |
| /// '__except' '(' seh-filter-expression ')' compound-statement |
| /// |
| StmtResult Parser::ParseSEHExceptBlock(SourceLocation ExceptLoc) { |
| PoisonIdentifierRAIIObject raii(Ident__exception_code, false), |
| raii2(Ident___exception_code, false), |
| raii3(Ident_GetExceptionCode, false); |
| |
| if (ExpectAndConsume(tok::l_paren)) |
| return StmtError(); |
| |
| ParseScope ExpectScope(this, Scope::DeclScope | Scope::ControlScope | |
| Scope::SEHExceptScope); |
| |
| if (getLangOpts().Borland) { |
| Ident__exception_info->setIsPoisoned(false); |
| Ident___exception_info->setIsPoisoned(false); |
| Ident_GetExceptionInfo->setIsPoisoned(false); |
| } |
| |
| ExprResult FilterExpr; |
| { |
| ParseScopeFlags FilterScope(this, getCurScope()->getFlags() | |
| Scope::SEHFilterScope); |
| FilterExpr = Actions.CorrectDelayedTyposInExpr(ParseExpression()); |
| } |
| |
| if (getLangOpts().Borland) { |
| Ident__exception_info->setIsPoisoned(true); |
| Ident___exception_info->setIsPoisoned(true); |
| Ident_GetExceptionInfo->setIsPoisoned(true); |
| } |
| |
| if(FilterExpr.isInvalid()) |
| return StmtError(); |
| |
| if (ExpectAndConsume(tok::r_paren)) |
| return StmtError(); |
| |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected) << tok::l_brace); |
| |
| StmtResult Block(ParseCompoundStatement()); |
| |
| if(Block.isInvalid()) |
| return Block; |
| |
| return Actions.ActOnSEHExceptBlock(ExceptLoc, FilterExpr.get(), Block.get()); |
| } |
| |
| /// ParseSEHFinallyBlock - Handle __finally |
| /// |
| /// seh-finally-block: |
| /// '__finally' compound-statement |
| /// |
| StmtResult Parser::ParseSEHFinallyBlock(SourceLocation FinallyLoc) { |
| PoisonIdentifierRAIIObject raii(Ident__abnormal_termination, false), |
| raii2(Ident___abnormal_termination, false), |
| raii3(Ident_AbnormalTermination, false); |
| |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected) << tok::l_brace); |
| |
| ParseScope FinallyScope(this, 0); |
| Actions.ActOnStartSEHFinallyBlock(); |
| |
| StmtResult Block(ParseCompoundStatement()); |
| if(Block.isInvalid()) { |
| Actions.ActOnAbortSEHFinallyBlock(); |
| return Block; |
| } |
| |
| return Actions.ActOnFinishSEHFinallyBlock(FinallyLoc, Block.get()); |
| } |
| |
| /// Handle __leave |
| /// |
| /// seh-leave-statement: |
| /// '__leave' ';' |
| /// |
| StmtResult Parser::ParseSEHLeaveStatement() { |
| SourceLocation LeaveLoc = ConsumeToken(); // eat the '__leave'. |
| return Actions.ActOnSEHLeaveStmt(LeaveLoc, getCurScope()); |
| } |
| |
| /// ParseLabeledStatement - We have an identifier and a ':' after it. |
| /// |
| /// labeled-statement: |
| /// identifier ':' statement |
| /// [GNU] identifier ':' attributes[opt] statement |
| /// |
| StmtResult Parser::ParseLabeledStatement(ParsedAttributesWithRange &attrs, |
| ParsedStmtContext StmtCtx) { |
| assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() && |
| "Not an identifier!"); |
| |
| // The substatement is always a 'statement', not a 'declaration', but is |
| // otherwise in the same context as the labeled-statement. |
| StmtCtx &= ~ParsedStmtContext::AllowDeclarationsInC; |
| |
| Token IdentTok = Tok; // Save the whole token. |
| ConsumeToken(); // eat the identifier. |
| |
| assert(Tok.is(tok::colon) && "Not a label!"); |
| |
| // identifier ':' statement |
| SourceLocation ColonLoc = ConsumeToken(); |
| |
| // Read label attributes, if present. |
| StmtResult SubStmt; |
| if (Tok.is(tok::kw___attribute)) { |
| ParsedAttributesWithRange TempAttrs(AttrFactory); |
| ParseGNUAttributes(TempAttrs); |
| |
| // In C++, GNU attributes only apply to the label if they are followed by a |
| // semicolon, to disambiguate label attributes from attributes on a labeled |
| // declaration. |
| // |
| // This doesn't quite match what GCC does; if the attribute list is empty |
| // and followed by a semicolon, GCC will reject (it appears to parse the |
| // attributes as part of a statement in that case). That looks like a bug. |
| if (!getLangOpts().CPlusPlus || Tok.is(tok::semi)) |
| attrs.takeAllFrom(TempAttrs); |
| else if (isDeclarationStatement()) { |
| StmtVector Stmts; |
| // FIXME: We should do this whether or not we have a declaration |
| // statement, but that doesn't work correctly (because ProhibitAttributes |
| // can't handle GNU attributes), so only call it in the one case where |
| // GNU attributes are allowed. |
| SubStmt = ParseStatementOrDeclarationAfterAttributes(Stmts, StmtCtx, |
| nullptr, TempAttrs); |
| if (!TempAttrs.empty() && !SubStmt.isInvalid()) |
| SubStmt = Actions.ProcessStmtAttributes(SubStmt.get(), TempAttrs, |
| TempAttrs.Range); |
| } else { |
| Diag(Tok, diag::err_expected_after) << "__attribute__" << tok::semi; |
| } |
| } |
| |
| // If we've not parsed a statement yet, parse one now. |
| if (!SubStmt.isInvalid() && !SubStmt.isUsable()) |
| SubStmt = ParseStatement(nullptr, StmtCtx); |
| |
| // Broken substmt shouldn't prevent the label from being added to the AST. |
| if (SubStmt.isInvalid()) |
| SubStmt = Actions.ActOnNullStmt(ColonLoc); |
| |
| LabelDecl *LD = Actions.LookupOrCreateLabel(IdentTok.getIdentifierInfo(), |
| IdentTok.getLocation()); |
| Actions.ProcessDeclAttributeList(Actions.CurScope, LD, attrs); |
| attrs.clear(); |
| |
| return Actions.ActOnLabelStmt(IdentTok.getLocation(), LD, ColonLoc, |
| SubStmt.get()); |
| } |
| |
| /// ParseCaseStatement |
| /// labeled-statement: |
| /// 'case' constant-expression ':' statement |
| /// [GNU] 'case' constant-expression '...' constant-expression ':' statement |
| /// |
| StmtResult Parser::ParseCaseStatement(ParsedStmtContext StmtCtx, |
| bool MissingCase, ExprResult Expr) { |
| assert((MissingCase || Tok.is(tok::kw_case)) && "Not a case stmt!"); |
| |
| // The substatement is always a 'statement', not a 'declaration', but is |
| // otherwise in the same context as the labeled-statement. |
| StmtCtx &= ~ParsedStmtContext::AllowDeclarationsInC; |
| |
| // It is very very common for code to contain many case statements recursively |
| // nested, as in (but usually without indentation): |
| // case 1: |
| // case 2: |
| // case 3: |
| // case 4: |
| // case 5: etc. |
| // |
| // Parsing this naively works, but is both inefficient and can cause us to run |
| // out of stack space in our recursive descent parser. As a special case, |
| // flatten this recursion into an iterative loop. This is complex and gross, |
| // but all the grossness is constrained to ParseCaseStatement (and some |
| // weirdness in the actions), so this is just local grossness :). |
| |
| // TopLevelCase - This is the highest level we have parsed. 'case 1' in the |
| // example above. |
| StmtResult TopLevelCase(true); |
| |
| // DeepestParsedCaseStmt - This is the deepest statement we have parsed, which |
| // gets updated each time a new case is parsed, and whose body is unset so |
| // far. When parsing 'case 4', this is the 'case 3' node. |
| Stmt *DeepestParsedCaseStmt = nullptr; |
| |
| // While we have case statements, eat and stack them. |
| SourceLocation ColonLoc; |
| do { |
| SourceLocation CaseLoc = MissingCase ? Expr.get()->getExprLoc() : |
| ConsumeToken(); // eat the 'case'. |
| ColonLoc = SourceLocation(); |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteCase(getCurScope()); |
| cutOffParsing(); |
| return StmtError(); |
| } |
| |
| /// We don't want to treat 'case x : y' as a potential typo for 'case x::y'. |
| /// Disable this form of error recovery while we're parsing the case |
| /// expression. |
| ColonProtectionRAIIObject ColonProtection(*this); |
| |
| ExprResult LHS; |
| if (!MissingCase) { |
| LHS = ParseCaseExpression(CaseLoc); |
| if (LHS.isInvalid()) { |
| // If constant-expression is parsed unsuccessfully, recover by skipping |
| // current case statement (moving to the colon that ends it). |
| if (!SkipUntil(tok::colon, tok::r_brace, StopAtSemi | StopBeforeMatch)) |
| return StmtError(); |
| } |
| } else { |
| LHS = Expr; |
| MissingCase = false; |
| } |
| |
| // GNU case range extension. |
| SourceLocation DotDotDotLoc; |
| ExprResult RHS; |
| if (TryConsumeToken(tok::ellipsis, DotDotDotLoc)) { |
| Diag(DotDotDotLoc, diag::ext_gnu_case_range); |
| RHS = ParseCaseExpression(CaseLoc); |
| if (RHS.isInvalid()) { |
| if (!SkipUntil(tok::colon, tok::r_brace, StopAtSemi | StopBeforeMatch)) |
| return StmtError(); |
| } |
| } |
| |
| ColonProtection.restore(); |
| |
| if (TryConsumeToken(tok::colon, ColonLoc)) { |
| } else if (TryConsumeToken(tok::semi, ColonLoc) || |
| TryConsumeToken(tok::coloncolon, ColonLoc)) { |
| // Treat "case blah;" or "case blah::" as a typo for "case blah:". |
| Diag(ColonLoc, diag::err_expected_after) |
| << "'case'" << tok::colon |
| << FixItHint::CreateReplacement(ColonLoc, ":"); |
| } else { |
| SourceLocation ExpectedLoc = PP.getLocForEndOfToken(PrevTokLocation); |
| Diag(ExpectedLoc, diag::err_expected_after) |
| << "'case'" << tok::colon |
| << FixItHint::CreateInsertion(ExpectedLoc, ":"); |
| ColonLoc = ExpectedLoc; |
| } |
| |
| StmtResult Case = |
| Actions.ActOnCaseStmt(CaseLoc, LHS, DotDotDotLoc, RHS, ColonLoc); |
| |
| // If we had a sema error parsing this case, then just ignore it and |
| // continue parsing the sub-stmt. |
| if (Case.isInvalid()) { |
| if (TopLevelCase.isInvalid()) // No parsed case stmts. |
| return ParseStatement(/*TrailingElseLoc=*/nullptr, StmtCtx); |
| // Otherwise, just don't add it as a nested case. |
| } else { |
| // If this is the first case statement we parsed, it becomes TopLevelCase. |
| // Otherwise we link it into the current chain. |
| Stmt *NextDeepest = Case.get(); |
| if (TopLevelCase.isInvalid()) |
| TopLevelCase = Case; |
| else |
| Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, Case.get()); |
| DeepestParsedCaseStmt = NextDeepest; |
| } |
| |
| // Handle all case statements. |
| } while (Tok.is(tok::kw_case)); |
| |
| // If we found a non-case statement, start by parsing it. |
| StmtResult SubStmt; |
| |
| if (Tok.isNot(tok::r_brace)) { |
| SubStmt = ParseStatement(/*TrailingElseLoc=*/nullptr, StmtCtx); |
| } else { |
| // Nicely diagnose the common error "switch (X) { case 4: }", which is |
| // not valid. If ColonLoc doesn't point to a valid text location, there was |
| // another parsing error, so avoid producing extra diagnostics. |
| if (ColonLoc.isValid()) { |
| SourceLocation AfterColonLoc = PP.getLocForEndOfToken(ColonLoc); |
| Diag(AfterColonLoc, diag::err_label_end_of_compound_statement) |
| << FixItHint::CreateInsertion(AfterColonLoc, " ;"); |
| } |
| SubStmt = StmtError(); |
| } |
| |
| // Install the body into the most deeply-nested case. |
| if (DeepestParsedCaseStmt) { |
| // Broken sub-stmt shouldn't prevent forming the case statement properly. |
| if (SubStmt.isInvalid()) |
| SubStmt = Actions.ActOnNullStmt(SourceLocation()); |
| Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, SubStmt.get()); |
| } |
| |
| // Return the top level parsed statement tree. |
| return TopLevelCase; |
| } |
| |
| /// ParseDefaultStatement |
| /// labeled-statement: |
| /// 'default' ':' statement |
| /// Note that this does not parse the 'statement' at the end. |
| /// |
| StmtResult Parser::ParseDefaultStatement(ParsedStmtContext StmtCtx) { |
| assert(Tok.is(tok::kw_default) && "Not a default stmt!"); |
| |
| // The substatement is always a 'statement', not a 'declaration', but is |
| // otherwise in the same context as the labeled-statement. |
| StmtCtx &= ~ParsedStmtContext::AllowDeclarationsInC; |
| |
| SourceLocation DefaultLoc = ConsumeToken(); // eat the 'default'. |
| |
| SourceLocation ColonLoc; |
| if (TryConsumeToken(tok::colon, ColonLoc)) { |
| } else if (TryConsumeToken(tok::semi, ColonLoc)) { |
| // Treat "default;" as a typo for "default:". |
| Diag(ColonLoc, diag::err_expected_after) |
| << "'default'" << tok::colon |
| << FixItHint::CreateReplacement(ColonLoc, ":"); |
| } else { |
| SourceLocation ExpectedLoc = PP.getLocForEndOfToken(PrevTokLocation); |
| Diag(ExpectedLoc, diag::err_expected_after) |
| << "'default'" << tok::colon |
| << FixItHint::CreateInsertion(ExpectedLoc, ":"); |
| ColonLoc = ExpectedLoc; |
| } |
| |
| StmtResult SubStmt; |
| |
| if (Tok.isNot(tok::r_brace)) { |
| SubStmt = ParseStatement(/*TrailingElseLoc=*/nullptr, StmtCtx); |
| } else { |
| // Diagnose the common error "switch (X) {... default: }", which is |
| // not valid. |
| SourceLocation AfterColonLoc = PP.getLocForEndOfToken(ColonLoc); |
| Diag(AfterColonLoc, diag::err_label_end_of_compound_statement) |
| << FixItHint::CreateInsertion(AfterColonLoc, " ;"); |
| SubStmt = true; |
| } |
| |
| // Broken sub-stmt shouldn't prevent forming the case statement properly. |
| if (SubStmt.isInvalid()) |
| SubStmt = Actions.ActOnNullStmt(ColonLoc); |
| |
| return Actions.ActOnDefaultStmt(DefaultLoc, ColonLoc, |
| SubStmt.get(), getCurScope()); |
| } |
| |
| StmtResult Parser::ParseCompoundStatement(bool isStmtExpr) { |
| return ParseCompoundStatement(isStmtExpr, |
| Scope::DeclScope | Scope::CompoundStmtScope); |
| } |
| |
| /// ParseCompoundStatement - Parse a "{}" block. |
| /// |
| /// compound-statement: [C99 6.8.2] |
| /// { block-item-list[opt] } |
| /// [GNU] { label-declarations block-item-list } [TODO] |
| /// |
| /// block-item-list: |
| /// block-item |
| /// block-item-list block-item |
| /// |
| /// block-item: |
| /// declaration |
| /// [GNU] '__extension__' declaration |
| /// statement |
| /// |
| /// [GNU] label-declarations: |
| /// [GNU] label-declaration |
| /// [GNU] label-declarations label-declaration |
| /// |
| /// [GNU] label-declaration: |
| /// [GNU] '__label__' identifier-list ';' |
| /// |
| StmtResult Parser::ParseCompoundStatement(bool isStmtExpr, |
| unsigned ScopeFlags) { |
| assert(Tok.is(tok::l_brace) && "Not a compount stmt!"); |
| |
| // Enter a scope to hold everything within the compound stmt. Compound |
| // statements can always hold declarations. |
| ParseScope CompoundScope(this, ScopeFlags); |
| |
| // Parse the statements in the body. |
| return ParseCompoundStatementBody(isStmtExpr); |
| } |
| |
| /// Parse any pragmas at the start of the compound expression. We handle these |
| /// separately since some pragmas (FP_CONTRACT) must appear before any C |
| /// statement in the compound, but may be intermingled with other pragmas. |
| void Parser::ParseCompoundStatementLeadingPragmas() { |
| bool checkForPragmas = true; |
| while (checkForPragmas) { |
| switch (Tok.getKind()) { |
| case tok::annot_pragma_vis: |
| HandlePragmaVisibility(); |
| break; |
| case tok::annot_pragma_pack: |
| HandlePragmaPack(); |
| break; |
| case tok::annot_pragma_msstruct: |
| HandlePragmaMSStruct(); |
| break; |
| case tok::annot_pragma_align: |
| HandlePragmaAlign(); |
| break; |
| case tok::annot_pragma_weak: |
| HandlePragmaWeak(); |
| break; |
| case tok::annot_pragma_weakalias: |
| HandlePragmaWeakAlias(); |
| break; |
| case tok::annot_pragma_redefine_extname: |
| HandlePragmaRedefineExtname(); |
| break; |
| case tok::annot_pragma_opencl_extension: |
| HandlePragmaOpenCLExtension(); |
| break; |
| case tok::annot_pragma_fp_contract: |
| HandlePragmaFPContract(); |
| break; |
| case tok::annot_pragma_fp: |
| HandlePragmaFP(); |
| break; |
| case tok::annot_pragma_fenv_access: |
| HandlePragmaFEnvAccess(); |
| break; |
| case tok::annot_pragma_fenv_round: |
| HandlePragmaFEnvRound(); |
| break; |
| case tok::annot_pragma_float_control: |
| HandlePragmaFloatControl(); |
| break; |
| case tok::annot_pragma_ms_pointers_to_members: |
| HandlePragmaMSPointersToMembers(); |
| break; |
| case tok::annot_pragma_ms_pragma: |
| HandlePragmaMSPragma(); |
| break; |
| case tok::annot_pragma_ms_vtordisp: |
| HandlePragmaMSVtorDisp(); |
| break; |
| case tok::annot_pragma_dump: |
| HandlePragmaDump(); |
| break; |
| default: |
| checkForPragmas = false; |
| break; |
| } |
| } |
| |
| } |
| |
| /// Consume any extra semi-colons resulting in null statements, |
| /// returning true if any tok::semi were consumed. |
| bool Parser::ConsumeNullStmt(StmtVector &Stmts) { |
| if (!Tok.is(tok::semi)) |
| return false; |
| |
| SourceLocation StartLoc = Tok.getLocation(); |
| SourceLocation EndLoc; |
| |
| while (Tok.is(tok::semi) && !Tok.hasLeadingEmptyMacro() && |
| Tok.getLocation().isValid() && !Tok.getLocation().isMacroID()) { |
| EndLoc = Tok.getLocation(); |
| |
| // Don't just ConsumeToken() this tok::semi, do store it in AST. |
| StmtResult R = |
| ParseStatementOrDeclaration(Stmts, ParsedStmtContext::SubStmt); |
| if (R.isUsable()) |
| Stmts.push_back(R.get()); |
| } |
| |
| // Did not consume any extra semi. |
| if (EndLoc.isInvalid()) |
| return false; |
| |
| Diag(StartLoc, diag::warn_null_statement) |
| << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc)); |
| return true; |
| } |
| |
| StmtResult Parser::handleExprStmt(ExprResult E, ParsedStmtContext StmtCtx) { |
| bool IsStmtExprResult = false; |
| if ((StmtCtx & ParsedStmtContext::InStmtExpr) != ParsedStmtContext()) { |
| // For GCC compatibility we skip past NullStmts. |
| unsigned LookAhead = 0; |
| while (GetLookAheadToken(LookAhead).is(tok::semi)) { |
| ++LookAhead; |
| } |
| // Then look to see if the next two tokens close the statement expression; |
| // if so, this expression statement is the last statement in a statment |
| // expression. |
| IsStmtExprResult = GetLookAheadToken(LookAhead).is(tok::r_brace) && |
| GetLookAheadToken(LookAhead + 1).is(tok::r_paren); |
| } |
| |
| if (IsStmtExprResult) |
| E = Actions.ActOnStmtExprResult(E); |
| return Actions.ActOnExprStmt(E, /*DiscardedValue=*/!IsStmtExprResult); |
| } |
| |
| /// ParseCompoundStatementBody - Parse a sequence of statements and invoke the |
| /// ActOnCompoundStmt action. This expects the '{' to be the current token, and |
| /// consume the '}' at the end of the block. It does not manipulate the scope |
| /// stack. |
| StmtResult Parser::ParseCompoundStatementBody(bool isStmtExpr) { |
| PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), |
| Tok.getLocation(), |
| "in compound statement ('{}')"); |
| |
| // Record the state of the FPFeatures, restore on leaving the |
| // compound statement. |
| Sema::FPFeaturesStateRAII SaveFPContractState(Actions); |
| |
| InMessageExpressionRAIIObject InMessage(*this, false); |
| BalancedDelimiterTracker T(*this, tok::l_brace); |
| if (T.consumeOpen()) |
| return StmtError(); |
| |
| Sema::CompoundScopeRAII CompoundScope(Actions, isStmtExpr); |
| |
| // Parse any pragmas at the beginning of the compound statement. |
| ParseCompoundStatementLeadingPragmas(); |
| |
| StmtVector Stmts; |
| |
| // "__label__ X, Y, Z;" is the GNU "Local Label" extension. These are |
| // only allowed at the start of a compound stmt regardless of the language. |
| while (Tok.is(tok::kw___label__)) { |
| SourceLocation LabelLoc = ConsumeToken(); |
| |
| SmallVector<Decl *, 8> DeclsInGroup; |
| while (1) { |
| if (Tok.isNot(tok::identifier)) { |
| Diag(Tok, diag::err_expected) << tok::identifier; |
| break; |
| } |
| |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| SourceLocation IdLoc = ConsumeToken(); |
| DeclsInGroup.push_back(Actions.LookupOrCreateLabel(II, IdLoc, LabelLoc)); |
| |
| if (!TryConsumeToken(tok::comma)) |
| break; |
| } |
| |
| DeclSpec DS(AttrFactory); |
| DeclGroupPtrTy Res = |
| Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup); |
| StmtResult R = Actions.ActOnDeclStmt(Res, LabelLoc, Tok.getLocation()); |
| |
| ExpectAndConsumeSemi(diag::err_expected_semi_declaration); |
| if (R.isUsable()) |
| Stmts.push_back(R.get()); |
| } |
| |
| ParsedStmtContext SubStmtCtx = |
| ParsedStmtContext::Compound | |
| (isStmtExpr ? ParsedStmtContext::InStmtExpr : ParsedStmtContext()); |
| |
| while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) && |
| Tok.isNot(tok::eof)) { |
| if (Tok.is(tok::annot_pragma_unused)) { |
| HandlePragmaUnused(); |
| continue; |
| } |
| |
| if (ConsumeNullStmt(Stmts)) |
| continue; |
| |
| StmtResult R; |
| if (Tok.isNot(tok::kw___extension__)) { |
| R = ParseStatementOrDeclaration(Stmts, SubStmtCtx); |
| } else { |
| // __extension__ can start declarations and it can also be a unary |
| // operator for expressions. Consume multiple __extension__ markers here |
| // until we can determine which is which. |
| // FIXME: This loses extension expressions in the AST! |
| SourceLocation ExtLoc = ConsumeToken(); |
| while (Tok.is(tok::kw___extension__)) |
| ConsumeToken(); |
| |
| ParsedAttributesWithRange attrs(AttrFactory); |
| MaybeParseCXX11Attributes(attrs, nullptr, |
| /*MightBeObjCMessageSend*/ true); |
| |
| // If this is the start of a declaration, parse it as such. |
| if (isDeclarationStatement()) { |
| // __extension__ silences extension warnings in the subdeclaration. |
| // FIXME: Save the __extension__ on the decl as a node somehow? |
| ExtensionRAIIObject O(Diags); |
| |
| SourceLocation DeclStart = Tok.getLocation(), DeclEnd; |
| DeclGroupPtrTy Res = |
| ParseDeclaration(DeclaratorContext::BlockContext, DeclEnd, attrs); |
| R = Actions.ActOnDeclStmt(Res, DeclStart, DeclEnd); |
| } else { |
| // Otherwise this was a unary __extension__ marker. |
| ExprResult Res(ParseExpressionWithLeadingExtension(ExtLoc)); |
| |
| if (Res.isInvalid()) { |
| SkipUntil(tok::semi); |
| continue; |
| } |
| |
| // Eat the semicolon at the end of stmt and convert the expr into a |
| // statement. |
| ExpectAndConsumeSemi(diag::err_expected_semi_after_expr); |
| R = handleExprStmt(Res, SubStmtCtx); |
| if (R.isUsable()) |
| R = Actions.ProcessStmtAttributes(R.get(), attrs, attrs.Range); |
| } |
| } |
| |
| if (R.isUsable()) |
| Stmts.push_back(R.get()); |
| } |
| |
| SourceLocation CloseLoc = Tok.getLocation(); |
| |
| // We broke out of the while loop because we found a '}' or EOF. |
| if (!T.consumeClose()) { |
| // If this is the '})' of a statement expression, check that it's written |
| // in a sensible way. |
| if (isStmtExpr && Tok.is(tok::r_paren)) |
| checkCompoundToken(CloseLoc, tok::r_brace, CompoundToken::StmtExprEnd); |
| } else { |
| // Recover by creating a compound statement with what we parsed so far, |
| // instead of dropping everything and returning StmtError(). |
| } |
| |
| if (T.getCloseLocation().isValid()) |
| CloseLoc = T.getCloseLocation(); |
| |
| return Actions.ActOnCompoundStmt(T.getOpenLocation(), CloseLoc, |
| Stmts, isStmtExpr); |
| } |
| |
| /// ParseParenExprOrCondition: |
| /// [C ] '(' expression ')' |
| /// [C++] '(' condition ')' |
| /// [C++1z] '(' init-statement[opt] condition ')' |
| /// |
| /// This function parses and performs error recovery on the specified condition |
| /// or expression (depending on whether we're in C++ or C mode). This function |
| /// goes out of its way to recover well. It returns true if there was a parser |
| /// error (the right paren couldn't be found), which indicates that the caller |
| /// should try to recover harder. It returns false if the condition is |
| /// successfully parsed. Note that a successful parse can still have semantic |
| /// errors in the condition. |
| /// Additionally, if LParenLoc and RParenLoc are non-null, it will assign |
| /// the location of the outer-most '(' and ')', respectively, to them. |
| bool Parser::ParseParenExprOrCondition(StmtResult *InitStmt, |
| Sema::ConditionResult &Cond, |
| SourceLocation Loc, |
| Sema::ConditionKind CK, |
| SourceLocation *LParenLoc, |
| SourceLocation *RParenLoc) { |
| BalancedDelimiterTracker T(*this, tok::l_paren); |
| T.consumeOpen(); |
| |
| if (getLangOpts().CPlusPlus) |
| Cond = ParseCXXCondition(InitStmt, Loc, CK); |
| else { |
| ExprResult CondExpr = ParseExpression(); |
| |
| // If required, convert to a boolean value. |
| if (CondExpr.isInvalid()) |
| Cond = Sema::ConditionError(); |
| else |
| Cond = Actions.ActOnCondition(getCurScope(), Loc, CondExpr.get(), CK); |
| } |
| |
| // If the parser was confused by the condition and we don't have a ')', try to |
| // recover by skipping ahead to a semi and bailing out. If condexp is |
| // semantically invalid but we have well formed code, keep going. |
| if (Cond.isInvalid() && Tok.isNot(tok::r_paren)) { |
| SkipUntil(tok::semi); |
| // Skipping may have stopped if it found the containing ')'. If so, we can |
| // continue parsing the if statement. |
| if (Tok.isNot(tok::r_paren)) |
| return true; |
| } |
| |
| // Otherwise the condition is valid or the rparen is present. |
| T.consumeClose(); |
| |
| if (LParenLoc != nullptr) { |
| *LParenLoc = T.getOpenLocation(); |
| } |
| if (RParenLoc != nullptr) { |
| *RParenLoc = T.getCloseLocation(); |
| } |
| |
| // Check for extraneous ')'s to catch things like "if (foo())) {". We know |
| // that all callers are looking for a statement after the condition, so ")" |
| // isn't valid. |
| while (Tok.is(tok::r_paren)) { |
| Diag(Tok, diag::err_extraneous_rparen_in_condition) |
| << FixItHint::CreateRemoval(Tok.getLocation()); |
| ConsumeParen(); |
| } |
| |
| return false; |
| } |
| |
| namespace { |
| |
| enum MisleadingStatementKind { MSK_if, MSK_else, MSK_for, MSK_while }; |
| |
| struct MisleadingIndentationChecker { |
| Parser &P; |
| SourceLocation StmtLoc; |
| SourceLocation PrevLoc; |
| unsigned NumDirectives; |
| MisleadingStatementKind Kind; |
| bool ShouldSkip; |
| MisleadingIndentationChecker(Parser &P, MisleadingStatementKind K, |
| SourceLocation SL) |
| : P(P), StmtLoc(SL), PrevLoc(P.getCurToken().getLocation()), |
| NumDirectives(P.getPreprocessor().getNumDirectives()), Kind(K), |
| ShouldSkip(P.getCurToken().is(tok::l_brace)) { |
| if (!P.MisleadingIndentationElseLoc.isInvalid()) { |
| StmtLoc = P.MisleadingIndentationElseLoc; |
| P.MisleadingIndentationElseLoc = SourceLocation(); |
| } |
| if (Kind == MSK_else && !ShouldSkip) |
| P.MisleadingIndentationElseLoc = SL; |
| } |
| |
| /// Compute the column number will aligning tabs on TabStop (-ftabstop), this |
| /// gives the visual indentation of the SourceLocation. |
| static unsigned getVisualIndentation(SourceManager &SM, SourceLocation Loc) { |
| unsigned TabStop = SM.getDiagnostics().getDiagnosticOptions().TabStop; |
| |
| unsigned ColNo = SM.getSpellingColumnNumber(Loc); |
| if (ColNo == 0 || TabStop == 1) |
| return ColNo; |
| |
| std::pair<FileID, unsigned> FIDAndOffset = SM.getDecomposedLoc(Loc); |
| |
| bool Invalid; |
| StringRef BufData = SM.getBufferData(FIDAndOffset.first, &Invalid); |
| if (Invalid) |
| return 0; |
| |
| const char *EndPos = BufData.data() + FIDAndOffset.second; |
| // FileOffset are 0-based and Column numbers are 1-based |
| assert(FIDAndOffset.second + 1 >= ColNo && |
| "Column number smaller than file offset?"); |
| |
| unsigned VisualColumn = 0; // Stored as 0-based column, here. |
| // Loop from beginning of line up to Loc's file position, counting columns, |
| // expanding tabs. |
| for (const char *CurPos = EndPos - (ColNo - 1); CurPos != EndPos; |
| ++CurPos) { |
| if (*CurPos == '\t') |
| // Advance visual column to next tabstop. |
| VisualColumn += (TabStop - VisualColumn % TabStop); |
| else |
| VisualColumn++; |
| } |
| return VisualColumn + 1; |
| } |
| |
| void Check() { |
| Token Tok = P.getCurToken(); |
| if (P.getActions().getDiagnostics().isIgnored( |
| diag::warn_misleading_indentation, Tok.getLocation()) || |
| ShouldSkip || NumDirectives != P.getPreprocessor().getNumDirectives() || |
| Tok.isOneOf(tok::semi, tok::r_brace) || Tok.isAnnotation() || |
| Tok.getLocation().isMacroID() || PrevLoc.isMacroID() || |
| StmtLoc.isMacroID() || |
| (Kind == MSK_else && P.MisleadingIndentationElseLoc.isInvalid())) { |
| P.MisleadingIndentationElseLoc = SourceLocation(); |
| return; |
| } |
| if (Kind == MSK_else) |
| P.MisleadingIndentationElseLoc = SourceLocation(); |
| |
| SourceManager &SM = P.getPreprocessor().getSourceManager(); |
| unsigned PrevColNum = getVisualIndentation(SM, PrevLoc); |
| unsigned CurColNum = getVisualIndentation(SM, Tok.getLocation()); |
| unsigned StmtColNum = getVisualIndentation(SM, StmtLoc); |
| |
| if (PrevColNum != 0 && CurColNum != 0 && StmtColNum != 0 && |
| ((PrevColNum > StmtColNum && PrevColNum == CurColNum) || |
| !Tok.isAtStartOfLine()) && |
| SM.getPresumedLineNumber(StmtLoc) != |
| SM.getPresumedLineNumber(Tok.getLocation()) && |
| (Tok.isNot(tok::identifier) || |
| P.getPreprocessor().LookAhead(0).isNot(tok::colon))) { |
| P.Diag(Tok.getLocation(), diag::warn_misleading_indentation) << Kind; |
| P.Diag(StmtLoc, diag::note_previous_statement); |
| } |
| } |
| }; |
| |
| } |
| |
| /// ParseIfStatement |
| /// if-statement: [C99 6.8.4.1] |
| /// 'if' '(' expression ')' statement |
| /// 'if' '(' expression ')' statement 'else' statement |
| /// [C++] 'if' '(' condition ')' statement |
| /// [C++] 'if' '(' condition ')' statement 'else' statement |
| /// |
| StmtResult Parser::ParseIfStatement(SourceLocation *TrailingElseLoc) { |
| assert(Tok.is(tok::kw_if) && "Not an if stmt!"); |
| SourceLocation IfLoc = ConsumeToken(); // eat the 'if'. |
| |
| bool IsConstexpr = false; |
| if (Tok.is(tok::kw_constexpr)) { |
| Diag(Tok, getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_constexpr_if |
| : diag::ext_constexpr_if); |
| IsConstexpr = true; |
| ConsumeToken(); |
| } |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "if"; |
| SkipUntil(tok::semi); |
| return StmtError(); |
| } |
| |
| bool C99orCXX = getLangOpts().C99 || getLangOpts().CPlusPlus; |
| |
| // C99 6.8.4p3 - In C99, the if statement is a block. This is not |
| // the case for C90. |
| // |
| // C++ 6.4p3: |
| // A name introduced by a declaration in a condition is in scope from its |
| // point of declaration until the end of the substatements controlled by the |
| // condition. |
| // C++ 3.3.2p4: |
| // Names declared in the for-init-statement, and in the condition of if, |
| // while, for, and switch statements are local to the if, while, for, or |
| // switch statement (including the controlled statement). |
| // |
| ParseScope IfScope(this, Scope::DeclScope | Scope::ControlScope, C99orCXX); |
| |
| // Parse the condition. |
| StmtResult InitStmt; |
| Sema::ConditionResult Cond; |
| SourceLocation LParen; |
| SourceLocation RParen; |
| if (ParseParenExprOrCondition(&InitStmt, Cond, IfLoc, |
| IsConstexpr ? Sema::ConditionKind::ConstexprIf |
| : Sema::ConditionKind::Boolean, |
| &LParen, &RParen)) |
| return StmtError(); |
| |
| llvm::Optional<bool> ConstexprCondition; |
| if (IsConstexpr) |
| ConstexprCondition = Cond.getKnownValue(); |
| |
| bool IsBracedThen = Tok.is(tok::l_brace); |
| |
| // C99 6.8.4p3 - In C99, the body of the if statement is a scope, even if |
| // there is no compound stmt. C90 does not have this clause. We only do this |
| // if the body isn't a compound statement to avoid push/pop in common cases. |
| // |
| // C++ 6.4p1: |
| // The substatement in a selection-statement (each substatement, in the else |
| // form of the if statement) implicitly defines a local scope. |
| // |
| // For C++ we create a scope for the condition and a new scope for |
| // substatements because: |
| // -When the 'then' scope exits, we want the condition declaration to still be |
| // active for the 'else' scope too. |
| // -Sema will detect name clashes by considering declarations of a |
| // 'ControlScope' as part of its direct subscope. |
| // -If we wanted the condition and substatement to be in the same scope, we |
| // would have to notify ParseStatement not to create a new scope. It's |
| // simpler to let it create a new scope. |
| // |
| ParseScope InnerScope(this, Scope::DeclScope, C99orCXX, IsBracedThen); |
| |
| MisleadingIndentationChecker MIChecker(*this, MSK_if, IfLoc); |
| |
| // Read the 'then' stmt. |
| SourceLocation ThenStmtLoc = Tok.getLocation(); |
| |
| SourceLocation InnerStatementTrailingElseLoc; |
| StmtResult ThenStmt; |
| { |
| EnterExpressionEvaluationContext PotentiallyDiscarded( |
| Actions, Sema::ExpressionEvaluationContext::DiscardedStatement, nullptr, |
| Sema::ExpressionEvaluationContextRecord::EK_Other, |
| /*ShouldEnter=*/ConstexprCondition && !*ConstexprCondition); |
| ThenStmt = ParseStatement(&InnerStatementTrailingElseLoc); |
| } |
| |
| if (Tok.isNot(tok::kw_else)) |
| MIChecker.Check(); |
| |
| // Pop the 'if' scope if needed. |
| InnerScope.Exit(); |
| |
| // If it has an else, parse it. |
| SourceLocation ElseLoc; |
| SourceLocation ElseStmtLoc; |
| StmtResult ElseStmt; |
| |
| if (Tok.is(tok::kw_else)) { |
| if (TrailingElseLoc) |
| *TrailingElseLoc = Tok.getLocation(); |
| |
| ElseLoc = ConsumeToken(); |
| ElseStmtLoc = Tok.getLocation(); |
| |
| // C99 6.8.4p3 - In C99, the body of the if statement is a scope, even if |
| // there is no compound stmt. C90 does not have this clause. We only do |
| // this if the body isn't a compound statement to avoid push/pop in common |
| // cases. |
| // |
| // C++ 6.4p1: |
| // The substatement in a selection-statement (each substatement, in the else |
| // form of the if statement) implicitly defines a local scope. |
| // |
| ParseScope InnerScope(this, Scope::DeclScope, C99orCXX, |
| Tok.is(tok::l_brace)); |
| |
| MisleadingIndentationChecker MIChecker(*this, MSK_else, ElseLoc); |
| |
| EnterExpressionEvaluationContext PotentiallyDiscarded( |
| Actions, Sema::ExpressionEvaluationContext::DiscardedStatement, nullptr, |
| Sema::ExpressionEvaluationContextRecord::EK_Other, |
| /*ShouldEnter=*/ConstexprCondition && *ConstexprCondition); |
| ElseStmt = ParseStatement(); |
| |
| if (ElseStmt.isUsable()) |
| MIChecker.Check(); |
| |
| // Pop the 'else' scope if needed. |
| InnerScope.Exit(); |
| } else if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteAfterIf(getCurScope(), IsBracedThen); |
| cutOffParsing(); |
| return StmtError(); |
| } else if (InnerStatementTrailingElseLoc.isValid()) { |
| Diag(InnerStatementTrailingElseLoc, diag::warn_dangling_else); |
| } |
| |
| IfScope.Exit(); |
| |
| // If the then or else stmt is invalid and the other is valid (and present), |
| // make turn the invalid one into a null stmt to avoid dropping the other |
| // part. If both are invalid, return error. |
| if ((ThenStmt.isInvalid() && ElseStmt.isInvalid()) || |
| (ThenStmt.isInvalid() && ElseStmt.get() == nullptr) || |
| (ThenStmt.get() == nullptr && ElseStmt.isInvalid())) { |
| // Both invalid, or one is invalid and other is non-present: return error. |
| return StmtError(); |
| } |
| |
| // Now if either are invalid, replace with a ';'. |
| if (ThenStmt.isInvalid()) |
| ThenStmt = Actions.ActOnNullStmt(ThenStmtLoc); |
| if (ElseStmt.isInvalid()) |
| ElseStmt = Actions.ActOnNullStmt(ElseStmtLoc); |
| |
| return Actions.ActOnIfStmt(IfLoc, IsConstexpr, LParen, InitStmt.get(), Cond, |
| RParen, ThenStmt.get(), ElseLoc, ElseStmt.get()); |
| } |
| |
| /// ParseSwitchStatement |
| /// switch-statement: |
| /// 'switch' '(' expression ')' statement |
| /// [C++] 'switch' '(' condition ')' statement |
| StmtResult Parser::ParseSwitchStatement(SourceLocation *TrailingElseLoc) { |
| assert(Tok.is(tok::kw_switch) && "Not a switch stmt!"); |
| SourceLocation SwitchLoc = ConsumeToken(); // eat the 'switch'. |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "switch"; |
| SkipUntil(tok::semi); |
| return StmtError(); |
| } |
| |
| bool C99orCXX = getLangOpts().C99 || getLangOpts().CPlusPlus; |
| |
| // C99 6.8.4p3 - In C99, the switch statement is a block. This is |
| // not the case for C90. Start the switch scope. |
| // |
| // C++ 6.4p3: |
| // A name introduced by a declaration in a condition is in scope from its |
| // point of declaration until the end of the substatements controlled by the |
| // condition. |
| // C++ 3.3.2p4: |
| // Names declared in the for-init-statement, and in the condition of if, |
| // while, for, and switch statements are local to the if, while, for, or |
| // switch statement (including the controlled statement). |
| // |
| unsigned ScopeFlags = Scope::SwitchScope; |
| if (C99orCXX) |
| ScopeFlags |= Scope::DeclScope | Scope::ControlScope; |
| ParseScope SwitchScope(this, ScopeFlags); |
| |
| // Parse the condition. |
| StmtResult InitStmt; |
| Sema::ConditionResult Cond; |
| SourceLocation LParen; |
| SourceLocation RParen; |
| if (ParseParenExprOrCondition(&InitStmt, Cond, SwitchLoc, |
| Sema::ConditionKind::Switch, &LParen, &RParen)) |
| return StmtError(); |
| |
| StmtResult Switch = Actions.ActOnStartOfSwitchStmt( |
| SwitchLoc, LParen, InitStmt.get(), Cond, RParen); |
| |
| if (Switch.isInvalid()) { |
| // Skip the switch body. |
| // FIXME: This is not optimal recovery, but parsing the body is more |
| // dangerous due to the presence of case and default statements, which |
| // will have no place to connect back with the switch. |
| if (Tok.is(tok::l_brace)) { |
| ConsumeBrace(); |
| SkipUntil(tok::r_brace); |
| } else |
| SkipUntil(tok::semi); |
| return Switch; |
| } |
| |
| // C99 6.8.4p3 - In C99, the body of the switch statement is a scope, even if |
| // there is no compound stmt. C90 does not have this clause. We only do this |
| // if the body isn't a compound statement to avoid push/pop in common cases. |
| // |
| // C++ 6.4p1: |
| // The substatement in a selection-statement (each substatement, in the else |
| // form of the if statement) implicitly defines a local scope. |
| // |
| // See comments in ParseIfStatement for why we create a scope for the |
| // condition and a new scope for substatement in C++. |
| // |
| getCurScope()->AddFlags(Scope::BreakScope); |
| ParseScope InnerScope(this, Scope::DeclScope, C99orCXX, Tok.is(tok::l_brace)); |
| |
| // We have incremented the mangling number for the SwitchScope and the |
| // InnerScope, which is one too many. |
| if (C99orCXX) |
| getCurScope()->decrementMSManglingNumber(); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement(TrailingElseLoc)); |
| |
| // Pop the scopes. |
| InnerScope.Exit(); |
| SwitchScope.Exit(); |
| |
| return Actions.ActOnFinishSwitchStmt(SwitchLoc, Switch.get(), Body.get()); |
| } |
| |
| /// ParseWhileStatement |
| /// while-statement: [C99 6.8.5.1] |
| /// 'while' '(' expression ')' statement |
| /// [C++] 'while' '(' condition ')' statement |
| StmtResult Parser::ParseWhileStatement(SourceLocation *TrailingElseLoc) { |
| assert(Tok.is(tok::kw_while) && "Not a while stmt!"); |
| SourceLocation WhileLoc = Tok.getLocation(); |
| ConsumeToken(); // eat the 'while'. |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "while"; |
| SkipUntil(tok::semi); |
| return StmtError(); |
| } |
| |
| bool C99orCXX = getLangOpts().C99 || getLangOpts().CPlusPlus; |
| |
| // C99 6.8.5p5 - In C99, the while statement is a block. This is not |
| // the case for C90. Start the loop scope. |
| // |
| // C++ 6.4p3: |
| // A name introduced by a declaration in a condition is in scope from its |
| // point of declaration until the end of the substatements controlled by the |
| // condition. |
| // C++ 3.3.2p4: |
| // Names declared in the for-init-statement, and in the condition of if, |
| // while, for, and switch statements are local to the if, while, for, or |
| // switch statement (including the controlled statement). |
| // |
| unsigned ScopeFlags; |
| if (C99orCXX) |
| ScopeFlags = Scope::BreakScope | Scope::ContinueScope | |
| Scope::DeclScope | Scope::ControlScope; |
| else |
| ScopeFlags = Scope::BreakScope | Scope::ContinueScope; |
| ParseScope WhileScope(this, ScopeFlags); |
| |
| // Parse the condition. |
| Sema::ConditionResult Cond; |
| SourceLocation LParen; |
| SourceLocation RParen; |
| if (ParseParenExprOrCondition(nullptr, Cond, WhileLoc, |
| Sema::ConditionKind::Boolean, &LParen, &RParen)) |
| return StmtError(); |
| |
| // C99 6.8.5p5 - In C99, the body of the while statement is a scope, even if |
| // there is no compound stmt. C90 does not have this clause. We only do this |
| // if the body isn't a compound statement to avoid push/pop in common cases. |
| // |
| // C++ 6.5p2: |
| // The substatement in an iteration-statement implicitly defines a local scope |
| // which is entered and exited each time through the loop. |
| // |
| // See comments in ParseIfStatement for why we create a scope for the |
| // condition and a new scope for substatement in C++. |
| // |
| ParseScope InnerScope(this, Scope::DeclScope, C99orCXX, Tok.is(tok::l_brace)); |
| |
| MisleadingIndentationChecker MIChecker(*this, MSK_while, WhileLoc); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement(TrailingElseLoc)); |
| |
| if (Body.isUsable()) |
| MIChecker.Check(); |
| // Pop the body scope if needed. |
| InnerScope.Exit(); |
| WhileScope.Exit(); |
| |
| if (Cond.isInvalid() || Body.isInvalid()) |
| return StmtError(); |
| |
| return Actions.ActOnWhileStmt(WhileLoc, LParen, Cond, RParen, Body.get()); |
| } |
| |
| /// ParseDoStatement |
| /// do-statement: [C99 6.8.5.2] |
| /// 'do' statement 'while' '(' expression ')' ';' |
| /// Note: this lets the caller parse the end ';'. |
| StmtResult Parser::ParseDoStatement() { |
| assert(Tok.is(tok::kw_do) && "Not a do stmt!"); |
| SourceLocation DoLoc = ConsumeToken(); // eat the 'do'. |
| |
| // C99 6.8.5p5 - In C99, the do statement is a block. This is not |
| // the case for C90. Start the loop scope. |
| unsigned ScopeFlags; |
| if (getLangOpts().C99) |
| ScopeFlags = Scope::BreakScope | Scope::ContinueScope | Scope::DeclScope; |
| else |
| ScopeFlags = Scope::BreakScope | Scope::ContinueScope; |
| |
| ParseScope DoScope(this, ScopeFlags); |
| |
| // C99 6.8.5p5 - In C99, the body of the do statement is a scope, even if |
| // there is no compound stmt. C90 does not have this clause. We only do this |
| // if the body isn't a compound statement to avoid push/pop in common cases. |
| // |
| // C++ 6.5p2: |
| // The substatement in an iteration-statement implicitly defines a local scope |
| // which is entered and exited each time through the loop. |
| // |
| bool C99orCXX = getLangOpts().C99 || getLangOpts().CPlusPlus; |
| ParseScope InnerScope(this, Scope::DeclScope, C99orCXX, Tok.is(tok::l_brace)); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement()); |
| |
| // Pop the body scope if needed. |
| InnerScope.Exit(); |
| |
| if (Tok.isNot(tok::kw_while)) { |
| if (!Body.isInvalid()) { |
| Diag(Tok, diag::err_expected_while); |
| Diag(DoLoc, diag::note_matching) << "'do'"; |
| SkipUntil(tok::semi, StopBeforeMatch); |
| } |
| return StmtError(); |
| } |
| SourceLocation WhileLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "do/while"; |
| SkipUntil(tok::semi, StopBeforeMatch); |
| return StmtError(); |
| } |
| |
| // Parse the parenthesized expression. |
| BalancedDelimiterTracker T(*this, tok::l_paren); |
| T.consumeOpen(); |
| |
| // A do-while expression is not a condition, so can't have attributes. |
| DiagnoseAndSkipCXX11Attributes(); |
| |
| ExprResult Cond = ParseExpression(); |
| // Correct the typos in condition before closing the scope. |
| if (Cond.isUsable()) |
| Cond = Actions.CorrectDelayedTyposInExpr(Cond); |
| T.consumeClose(); |
| DoScope.Exit(); |
| |
| if (Cond.isInvalid() || Body.isInvalid()) |
| return StmtError(); |
| |
| return Actions.ActOnDoStmt(DoLoc, Body.get(), WhileLoc, T.getOpenLocation(), |
| Cond.get(), T.getCloseLocation()); |
| } |
| |
| bool Parser::isForRangeIdentifier() { |
| assert(Tok.is(tok::identifier)); |
| |
| const Token &Next = NextToken(); |
| if (Next.is(tok::colon)) |
| return true; |
| |
| if (Next.isOneOf(tok::l_square, tok::kw_alignas)) { |
| TentativeParsingAction PA(*this); |
| ConsumeToken(); |
| SkipCXX11Attributes(); |
| bool Result = Tok.is(tok::colon); |
| PA.Revert(); |
| return Result; |
| } |
| |
| return false; |
| } |
| |
| /// ParseForStatement |
| /// for-statement: [C99 6.8.5.3] |
| /// 'for' '(' expr[opt] ';' expr[opt] ';' expr[opt] ')' statement |
| /// 'for' '(' declaration expr[opt] ';' expr[opt] ')' statement |
| /// [C++] 'for' '(' for-init-statement condition[opt] ';' expression[opt] ')' |
| /// [C++] statement |
| /// [C++0x] 'for' |
| /// 'co_await'[opt] [Coroutines] |
| /// '(' for-range-declaration ':' for-range-initializer ')' |
| /// statement |
| /// [OBJC2] 'for' '(' declaration 'in' expr ')' statement |
| /// [OBJC2] 'for' '(' expr 'in' expr ')' statement |
| /// |
| /// [C++] for-init-statement: |
| /// [C++] expression-statement |
| /// [C++] simple-declaration |
| /// |
| /// [C++0x] for-range-declaration: |
| /// [C++0x] attribute-specifier-seq[opt] type-specifier-seq declarator |
| /// [C++0x] for-range-initializer: |
| /// [C++0x] expression |
| /// [C++0x] braced-init-list [TODO] |
| StmtResult Parser::ParseForStatement(SourceLocation *TrailingElseLoc) { |
| assert(Tok.is(tok::kw_for) && "Not a for stmt!"); |
| SourceLocation ForLoc = ConsumeToken(); // eat the 'for'. |
| |
| SourceLocation CoawaitLoc; |
| if (Tok.is(tok::kw_co_await)) |
| CoawaitLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "for"; |
| SkipUntil(tok::semi); |
| return StmtError(); |
| } |
| |
| bool C99orCXXorObjC = getLangOpts().C99 || getLangOpts().CPlusPlus || |
| getLangOpts().ObjC; |
| |
| // C99 6.8.5p5 - In C99, the for statement is a block. This is not |
| // the case for C90. Start the loop scope. |
| // |
| // C++ 6.4p3: |
| // A name introduced by a declaration in a condition is in scope from its |
| // point of declaration until the end of the substatements controlled by the |
| // condition. |
| // C++ 3.3.2p4: |
| // Names declared in the for-init-statement, and in the condition of if, |
| // while, for, and switch statements are local to the if, while, for, or |
| // switch statement (including the controlled statement). |
| // C++ 6.5.3p1: |
| // Names declared in the for-init-statement are in the same declarative-region |
| // as those declared in the condition. |
| // |
| unsigned ScopeFlags = 0; |
| if (C99orCXXorObjC) |
| ScopeFlags = Scope::DeclScope | Scope::ControlScope; |
| |
| ParseScope ForScope(this, ScopeFlags); |
| |
| BalancedDelimiterTracker T(*this, tok::l_paren); |
| T.consumeOpen(); |
| |
| ExprResult Value; |
| |
| bool ForEach = false; |
| StmtResult FirstPart; |
| Sema::ConditionResult SecondPart; |
| ExprResult Collection; |
| ForRangeInfo ForRangeInfo; |
| FullExprArg ThirdPart(Actions); |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteOrdinaryName(getCurScope(), |
| C99orCXXorObjC? Sema::PCC_ForInit |
| : Sema::PCC_Expression); |
| cutOffParsing(); |
| return StmtError(); |
| } |
| |
| ParsedAttributesWithRange attrs(AttrFactory); |
| MaybeParseCXX11Attributes(attrs); |
| |
| SourceLocation EmptyInitStmtSemiLoc; |
| |
| // Parse the first part of the for specifier. |
| if (Tok.is(tok::semi)) { // for (; |
| ProhibitAttributes(attrs); |
| // no first part, eat the ';'. |
| SourceLocation SemiLoc = Tok.getLocation(); |
| if (!Tok.hasLeadingEmptyMacro() && !SemiLoc.isMacroID()) |
| EmptyInitStmtSemiLoc = SemiLoc; |
| ConsumeToken(); |
| } else if (getLangOpts().CPlusPlus && Tok.is(tok::identifier) && |
| isForRangeIdentifier()) { |
| ProhibitAttributes(attrs); |
| IdentifierInfo *Name = Tok.getIdentifierInfo(); |
| SourceLocation Loc = ConsumeToken(); |
| MaybeParseCXX11Attributes(attrs); |
| |
| ForRangeInfo.ColonLoc = ConsumeToken(); |
| if (Tok.is(tok::l_brace)) |
| ForRangeInfo.RangeExpr = ParseBraceInitializer(); |
| else |
| ForRangeInfo.RangeExpr = ParseExpression(); |
| |
| Diag(Loc, diag::err_for_range_identifier) |
| << ((getLangOpts().CPlusPlus11 && !getLangOpts().CPlusPlus17) |
| ? FixItHint::CreateInsertion(Loc, "auto &&") |
| : FixItHint()); |
| |
| ForRangeInfo.LoopVar = Actions.ActOnCXXForRangeIdentifier( |
| getCurScope(), Loc, Name, attrs, attrs.Range.getEnd()); |
| } else if (isForInitDeclaration()) { // for (int X = 4; |
| ParenBraceBracketBalancer BalancerRAIIObj(*this); |
| |
| // Parse declaration, which eats the ';'. |
| if (!C99orCXXorObjC) { // Use of C99-style for loops in C90 mode? |
| Diag(Tok, diag::ext_c99_variable_decl_in_for_loop); |
| Diag(Tok, diag::warn_gcc_variable_decl_in_for_loop); |
| } |
| |
| // In C++0x, "for (T NS:a" might not be a typo for :: |
| bool MightBeForRangeStmt = getLangOpts().CPlusPlus; |
| ColonProtectionRAIIObject ColonProtection(*this, MightBeForRangeStmt); |
| |
| SourceLocation DeclStart = Tok.getLocation(), DeclEnd; |
| DeclGroupPtrTy DG = ParseSimpleDeclaration( |
| DeclaratorContext::ForContext, DeclEnd, attrs, false, |
| MightBeForRangeStmt ? &ForRangeInfo : nullptr); |
| FirstPart = Actions.ActOnDeclStmt(DG, DeclStart, Tok.getLocation()); |
| if (ForRangeInfo.ParsedForRangeDecl()) { |
| Diag(ForRangeInfo.ColonLoc, getLangOpts().CPlusPlus11 ? |
| diag::warn_cxx98_compat_for_range : diag::ext_for_range); |
| ForRangeInfo.LoopVar = FirstPart; |
| FirstPart = StmtResult(); |
| } else if (Tok.is(tok::semi)) { // for (int x = 4; |
| ConsumeToken(); |
| } else if ((ForEach = isTokIdentifier_in())) { |
| Actions.ActOnForEachDeclStmt(DG); |
| // ObjC: for (id x in expr) |
| ConsumeToken(); // consume 'in' |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteObjCForCollection(getCurScope(), DG); |
| cutOffParsing(); |
| return StmtError(); |
| } |
| Collection = ParseExpression(); |
| } else { |
| Diag(Tok, diag::err_expected_semi_for); |
| } |
| } else { |
| ProhibitAttributes(attrs); |
| Value = Actions.CorrectDelayedTyposInExpr(ParseExpression()); |
| |
| ForEach = isTokIdentifier_in(); |
| |
| // Turn the expression into a stmt. |
| if (!Value.isInvalid()) { |
| if (ForEach) |
| FirstPart = Actions.ActOnForEachLValueExpr(Value.get()); |
| else { |
| // We already know this is not an init-statement within a for loop, so |
| // if we are parsing a C++11 range-based for loop, we should treat this |
| // expression statement as being a discarded value expression because |
| // we will err below. This way we do not warn on an unused expression |
| // that was an error in the first place, like with: for (expr : expr); |
| bool IsRangeBasedFor = |
| getLangOpts().CPlusPlus11 && !ForEach && Tok.is(tok::colon); |
| FirstPart = Actions.ActOnExprStmt(Value, !IsRangeBasedFor); |
| } |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else if (ForEach) { |
| ConsumeToken(); // consume 'in' |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteObjCForCollection(getCurScope(), nullptr); |
| cutOffParsing(); |
| return StmtError(); |
| } |
| Collection = ParseExpression(); |
| } else if (getLangOpts().CPlusPlus11 && Tok.is(tok::colon) && FirstPart.get()) { |
| // User tried to write the reasonable, but ill-formed, for-range-statement |
| // for (expr : expr) { ... } |
| Diag(Tok, diag::err_for_range_expected_decl) |
| << FirstPart.get()->getSourceRange(); |
| SkipUntil(tok::r_paren, StopBeforeMatch); |
| SecondPart = Sema::ConditionError(); |
| } else { |
| if (!Value.isInvalid()) { |
| Diag(Tok, diag::err_expected_semi_for); |
| } else { |
| // Skip until semicolon or rparen, don't consume it. |
| SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| } |
| } |
| } |
| |
| // Parse the second part of the for specifier. |
| getCurScope()->AddFlags(Scope::BreakScope | Scope::ContinueScope); |
| if (!ForEach && !ForRangeInfo.ParsedForRangeDecl() && |
| !SecondPart.isInvalid()) { |
| // Parse the second part of the for specifier. |
| if (Tok.is(tok::semi)) { // for (...;; |
| // no second part. |
| } else if (Tok.is(tok::r_paren)) { |
| // missing both semicolons. |
| } else { |
| if (getLangOpts().CPlusPlus) { |
| // C++2a: We've parsed an init-statement; we might have a |
| // for-range-declaration next. |
| bool MightBeForRangeStmt = !ForRangeInfo.ParsedForRangeDecl(); |
| ColonProtectionRAIIObject ColonProtection(*this, MightBeForRangeStmt); |
| SecondPart = |
| ParseCXXCondition(nullptr, ForLoc, Sema::ConditionKind::Boolean, |
| MightBeForRangeStmt ? &ForRangeInfo : nullptr); |
| |
| if (ForRangeInfo.ParsedForRangeDecl()) { |
| Diag(FirstPart.get() ? FirstPart.get()->getBeginLoc() |
| : ForRangeInfo.ColonLoc, |
| getLangOpts().CPlusPlus20 |
| ? diag::warn_cxx17_compat_for_range_init_stmt |
| : diag::ext_for_range_init_stmt) |
| << (FirstPart.get() ? FirstPart.get()->getSourceRange() |
| : SourceRange()); |
| if (EmptyInitStmtSemiLoc.isValid()) { |
| Diag(EmptyInitStmtSemiLoc, diag::warn_empty_init_statement) |
| << /*for-loop*/ 2 |
| << FixItHint::CreateRemoval(EmptyInitStmtSemiLoc); |
| } |
| } |
| } else { |
| ExprResult SecondExpr = ParseExpression(); |
| if (SecondExpr.isInvalid()) |
| SecondPart = Sema::ConditionError(); |
| else |
| SecondPart = |
| Actions.ActOnCondition(getCurScope(), ForLoc, SecondExpr.get(), |
| Sema::ConditionKind::Boolean); |
| } |
| } |
| } |
| |
| // Parse the third part of the for statement. |
| if (!ForEach && !ForRangeInfo.ParsedForRangeDecl()) { |
| if (Tok.isNot(tok::semi)) { |
| if (!SecondPart.isInvalid()) |
| Diag(Tok, diag::err_expected_semi_for); |
| else |
| // Skip until semicolon or rparen, don't consume it. |
| SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch); |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } |
| |
| if (Tok.isNot(tok::r_paren)) { // for (...;...;) |
| ExprResult Third = ParseExpression(); |
| // FIXME: The C++11 standard doesn't actually say that this is a |
| // discarded-value expression, but it clearly should be. |
| ThirdPart = Actions.MakeFullDiscardedValueExpr(Third.get()); |
| } |
| } |
| // Match the ')'. |
| T.consumeClose(); |
| |
| // C++ Coroutines [stmt.iter]: |
| // 'co_await' can only be used for a range-based for statement. |
| if (CoawaitLoc.isValid() && !ForRangeInfo.ParsedForRangeDecl()) { |
| Diag(CoawaitLoc, diag::err_for_co_await_not_range_for); |
| CoawaitLoc = SourceLocation(); |
| } |
| |
| // We need to perform most of the semantic analysis for a C++0x for-range |
| // statememt before parsing the body, in order to be able to deduce the type |
| // of an auto-typed loop variable. |
| StmtResult ForRangeStmt; |
| StmtResult ForEachStmt; |
| |
| if (ForRangeInfo.ParsedForRangeDecl()) { |
| ExprResult CorrectedRange = |
| Actions.CorrectDelayedTyposInExpr(ForRangeInfo.RangeExpr.get()); |
| ForRangeStmt = Actions.ActOnCXXForRangeStmt( |
| getCurScope(), ForLoc, CoawaitLoc, FirstPart.get(), |
| ForRangeInfo.LoopVar.get(), ForRangeInfo.ColonLoc, CorrectedRange.get(), |
| T.getCloseLocation(), Sema::BFRK_Build); |
| |
| // Similarly, we need to do the semantic analysis for a for-range |
| // statement immediately in order to close over temporaries correctly. |
| } else if (ForEach) { |
| ForEachStmt = Actions.ActOnObjCForCollectionStmt(ForLoc, |
| FirstPart.get(), |
| Collection.get(), |
| T.getCloseLocation()); |
| } else { |
| // In OpenMP loop region loop control variable must be captured and be |
| // private. Perform analysis of first part (if any). |
| if (getLangOpts().OpenMP && FirstPart.isUsable()) { |
| Actions.ActOnOpenMPLoopInitialization(ForLoc, FirstPart.get()); |
| } |
| } |
| |
| // C99 6.8.5p5 - In C99, the body of the for statement is a scope, even if |
| // there is no compound stmt. C90 does not have this clause. We only do this |
| // if the body isn't a compound statement to avoid push/pop in common cases. |
| // |
| // C++ 6.5p2: |
| // The substatement in an iteration-statement implicitly defines a local scope |
| // which is entered and exited each time through the loop. |
| // |
| // See comments in ParseIfStatement for why we create a scope for |
| // for-init-statement/condition and a new scope for substatement in C++. |
| // |
| ParseScope InnerScope(this, Scope::DeclScope, C99orCXXorObjC, |
| Tok.is(tok::l_brace)); |
| |
| // The body of the for loop has the same local mangling number as the |
| // for-init-statement. |
| // It will only be incremented if the body contains other things that would |
| // normally increment the mangling number (like a compound statement). |
| if (C99orCXXorObjC) |
| getCurScope()->decrementMSManglingNumber(); |
| |
| MisleadingIndentationChecker MIChecker(*this, MSK_for, ForLoc); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement(TrailingElseLoc)); |
| |
| if (Body.isUsable()) |
| MIChecker.Check(); |
| |
| // Pop the body scope if needed. |
| InnerScope.Exit(); |
| |
| // Leave the for-scope. |
| ForScope.Exit(); |
| |
| if (Body.isInvalid()) |
| return StmtError(); |
| |
| if (ForEach) |
| return Actions.FinishObjCForCollectionStmt(ForEachStmt.get(), |
| Body.get()); |
| |
| if (ForRangeInfo.ParsedForRangeDecl()) |
| return Actions.FinishCXXForRangeStmt(ForRangeStmt.get(), Body.get()); |
| |
| return Actions.ActOnForStmt(ForLoc, T.getOpenLocation(), FirstPart.get(), |
| SecondPart, ThirdPart, T.getCloseLocation(), |
| Body.get()); |
| } |
| |
| /// ParseGotoStatement |
| /// jump-statement: |
| /// 'goto' identifier ';' |
| /// [GNU] 'goto' '*' expression ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| StmtResult Parser::ParseGotoStatement() { |
| assert(Tok.is(tok::kw_goto) && "Not a goto stmt!"); |
| SourceLocation GotoLoc = ConsumeToken(); // eat the 'goto'. |
| |
| StmtResult Res; |
| if (Tok.is(tok::identifier)) { |
| LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), |
| Tok.getLocation()); |
| Res = Actions.ActOnGotoStmt(GotoLoc, Tok.getLocation(), LD); |
| ConsumeToken(); |
| } else if (Tok.is(tok::star)) { |
| // GNU indirect goto extension. |
| Diag(Tok, diag::ext_gnu_indirect_goto); |
| SourceLocation StarLoc = ConsumeToken(); |
| ExprResult R(ParseExpression()); |
| if (R.isInvalid()) { // Skip to the semicolon, but don't consume it. |
| SkipUntil(tok::semi, StopBeforeMatch); |
| return StmtError(); |
| } |
| Res = Actions.ActOnIndirectGotoStmt(GotoLoc, StarLoc, R.get()); |
| } else { |
| Diag(Tok, diag::err_expected) << tok::identifier; |
| return StmtError(); |
| } |
| |
| return Res; |
| } |
| |
| /// ParseContinueStatement |
| /// jump-statement: |
| /// 'continue' ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| StmtResult Parser::ParseContinueStatement() { |
| SourceLocation ContinueLoc = ConsumeToken(); // eat the 'continue'. |
| return Actions.ActOnContinueStmt(ContinueLoc, getCurScope()); |
| } |
| |
| /// ParseBreakStatement |
| /// jump-statement: |
| /// 'break' ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| StmtResult Parser::ParseBreakStatement() { |
| SourceLocation BreakLoc = ConsumeToken(); // eat the 'break'. |
| return Actions.ActOnBreakStmt(BreakLoc, getCurScope()); |
| } |
| |
| /// ParseReturnStatement |
| /// jump-statement: |
| /// 'return' expression[opt] ';' |
| /// 'return' braced-init-list ';' |
| /// 'co_return' expression[opt] ';' |
| /// 'co_return' braced-init-list ';' |
| StmtResult Parser::ParseReturnStatement() { |
| assert((Tok.is(tok::kw_return) || Tok.is(tok::kw_co_return)) && |
| "Not a return stmt!"); |
| bool IsCoreturn = Tok.is(tok::kw_co_return); |
| SourceLocation ReturnLoc = ConsumeToken(); // eat the 'return'. |
| |
| ExprResult R; |
| if (Tok.isNot(tok::semi)) { |
| if (!IsCoreturn) |
| PreferredType.enterReturn(Actions, Tok.getLocation()); |
| // FIXME: Code completion for co_return. |
| if (Tok.is(tok::code_completion) && !IsCoreturn) { |
| Actions.CodeCompleteExpression(getCurScope(), |
| PreferredType.get(Tok.getLocation())); |
| cutOffParsing(); |
| return StmtError(); |
| } |
| |
| if (Tok.is(tok::l_brace) && getLangOpts().CPlusPlus) { |
| R = ParseInitializer(); |
| if (R.isUsable()) |
| Diag(R.get()->getBeginLoc(), |
| getLangOpts().CPlusPlus11 |
| ? diag::warn_cxx98_compat_generalized_initializer_lists |
| : diag::ext_generalized_initializer_lists) |
| << R.get()->getSourceRange(); |
| } else |
| R = ParseExpression(); |
| if (R.isInvalid()) { |
| SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); |
| return StmtError(); |
| } |
| } |
| if (IsCoreturn) |
| return Actions.ActOnCoreturnStmt(getCurScope(), ReturnLoc, R.get()); |
| return Actions.ActOnReturnStmt(ReturnLoc, R.get(), getCurScope()); |
| } |
| |
| StmtResult Parser::ParsePragmaLoopHint(StmtVector &Stmts, |
| ParsedStmtContext StmtCtx, |
| SourceLocation *TrailingElseLoc, |
| ParsedAttributesWithRange &Attrs) { |
| // Create temporary attribute list. |
| ParsedAttributesWithRange TempAttrs(AttrFactory); |
| |
| SourceLocation StartLoc = Tok.getLocation(); |
| |
| // Get loop hints and consume annotated token. |
| while (Tok.is(tok::annot_pragma_loop_hint)) { |
| LoopHint Hint; |
| if (!HandlePragmaLoopHint(Hint)) |
| continue; |
| |
| ArgsUnion ArgHints[] = {Hint.PragmaNameLoc, Hint.OptionLoc, Hint.StateLoc, |
| ArgsUnion(Hint.ValueExpr)}; |
| TempAttrs.addNew(Hint.PragmaNameLoc->Ident, Hint.Range, nullptr, |
| Hint.PragmaNameLoc->Loc, ArgHints, 4, |
| ParsedAttr::AS_Pragma); |
| } |
| |
| // Get the next statement. |
| MaybeParseCXX11Attributes(Attrs); |
| |
| StmtResult S = ParseStatementOrDeclarationAfterAttributes( |
| Stmts, StmtCtx, TrailingElseLoc, Attrs); |
| |
| Attrs.takeAllFrom(TempAttrs); |
| |
| // Start of attribute range may already be set for some invalid input. |
| // See PR46336. |
| if (Attrs.Range.getBegin().isInvalid()) |
| Attrs.Range.setBegin(StartLoc); |
| |
| return S; |
| } |
| |
| Decl *Parser::ParseFunctionStatementBody(Decl *Decl, ParseScope &BodyScope) { |
| assert(Tok.is(tok::l_brace)); |
| SourceLocation LBraceLoc = Tok.getLocation(); |
| |
| PrettyDeclStackTraceEntry CrashInfo(Actions.Context, Decl, LBraceLoc, |
| "parsing function body"); |
| |
| // Save and reset current vtordisp stack if we have entered a C++ method body. |
| bool IsCXXMethod = |
| getLangOpts().CPlusPlus && Decl && isa<CXXMethodDecl>(Decl); |
| Sema::PragmaStackSentinelRAII |
| PragmaStackSentinel(Actions, "InternalPragmaState", IsCXXMethod); |
| |
| // Do not enter a scope for the brace, as the arguments are in the same scope |
| // (the function body) as the body itself. Instead, just read the statement |
| // list and put it into a CompoundStmt for safe keeping. |
| StmtResult FnBody(ParseCompoundStatementBody()); |
| |
| // If the function body could not be parsed, make a bogus compoundstmt. |
| if (FnBody.isInvalid()) { |
| Sema::CompoundScopeRAII CompoundScope(Actions); |
| FnBody = Actions.ActOnCompoundStmt(LBraceLoc, LBraceLoc, None, false); |
| } |
| |
| BodyScope.Exit(); |
| return Actions.ActOnFinishFunctionBody(Decl, FnBody.get()); |
| } |
| |
| /// ParseFunctionTryBlock - Parse a C++ function-try-block. |
| /// |
| /// function-try-block: |
| /// 'try' ctor-initializer[opt] compound-statement handler-seq |
| /// |
| Decl *Parser::ParseFunctionTryBlock(Decl *Decl, ParseScope &BodyScope) { |
| assert(Tok.is(tok::kw_try) && "Expected 'try'"); |
| SourceLocation TryLoc = ConsumeToken(); |
| |
| PrettyDeclStackTraceEntry CrashInfo(Actions.Context, Decl, TryLoc, |
| "parsing function try block"); |
| |
| // Constructor initializer list? |
| if (Tok.is(tok::colon)) |
| ParseConstructorInitializer(Decl); |
| else |
| Actions.ActOnDefaultCtorInitializers(Decl); |
| |
| // Save and reset current vtordisp stack if we have entered a C++ method body. |
| bool IsCXXMethod = |
| getLangOpts().CPlusPlus && Decl && isa<CXXMethodDecl>(Decl); |
| Sema::PragmaStackSentinelRAII |
| PragmaStackSentinel(Actions, "InternalPragmaState", IsCXXMethod); |
| |
| SourceLocation LBraceLoc = Tok.getLocation(); |
| StmtResult FnBody(ParseCXXTryBlockCommon(TryLoc, /*FnTry*/true)); |
| // If we failed to parse the try-catch, we just give the function an empty |
| // compound statement as the body. |
| if (FnBody.isInvalid()) { |
| Sema::CompoundScopeRAII CompoundScope(Actions); |
| FnBody = Actions.ActOnCompoundStmt(LBraceLoc, LBraceLoc, None, false); |
| } |
| |
| BodyScope.Exit(); |
| return Actions.ActOnFinishFunctionBody(Decl, FnBody.get()); |
| } |
| |
| bool Parser::trySkippingFunctionBody() { |
| assert(SkipFunctionBodies && |
| "Should only be called when SkipFunctionBodies is enabled"); |
| if (!PP.isCodeCompletionEnabled()) { |
| SkipFunctionBody(); |
| return true; |
| } |
| |
| // We're in code-completion mode. Skip parsing for all function bodies unless |
| // the body contains the code-completion point. |
| TentativeParsingAction PA(*this); |
| bool IsTryCatch = Tok.is(tok::kw_try); |
| CachedTokens Toks; |
| bool ErrorInPrologue = ConsumeAndStoreFunctionPrologue(Toks); |
| if (llvm::any_of(Toks, [](const Token &Tok) { |
| return Tok.is(tok::code_completion); |
| })) { |
| PA.Revert(); |
| return false; |
| } |
| if (ErrorInPrologue) { |
| PA.Commit(); |
| SkipMalformedDecl(); |
| return true; |
| } |
| if (!SkipUntil(tok::r_brace, StopAtCodeCompletion)) { |
| PA.Revert(); |
| return false; |
| } |
| while (IsTryCatch && Tok.is(tok::kw_catch)) { |
| if (!SkipUntil(tok::l_brace, StopAtCodeCompletion) || |
| !SkipUntil(tok::r_brace, StopAtCodeCompletion)) { |
| PA.Revert(); |
| return false; |
| } |
| } |
| PA.Commit(); |
| return true; |
| } |
| |
| /// ParseCXXTryBlock - Parse a C++ try-block. |
| /// |
| /// try-block: |
| /// 'try' compound-statement handler-seq |
| /// |
| StmtResult Parser::ParseCXXTryBlock() { |
| assert(Tok.is(tok::kw_try) && "Expected 'try'"); |
| |
| SourceLocation TryLoc = ConsumeToken(); |
| return ParseCXXTryBlockCommon(TryLoc); |
| } |
| |
| /// ParseCXXTryBlockCommon - Parse the common part of try-block and |
| /// function-try-block. |
| /// |
| /// try-block: |
| /// 'try' compound-statement handler-seq |
| /// |
| /// function-try-block: |
| /// 'try' ctor-initializer[opt] compound-statement handler-seq |
| /// |
| /// handler-seq: |
| /// handler handler-seq[opt] |
| /// |
| /// [Borland] try-block: |
| /// 'try' compound-statement seh-except-block |
| /// 'try' compound-statement seh-finally-block |
| /// |
| StmtResult Parser::ParseCXXTryBlockCommon(SourceLocation TryLoc, bool FnTry) { |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected) << tok::l_brace); |
| |
| StmtResult TryBlock(ParseCompoundStatement( |
| /*isStmtExpr=*/false, Scope::DeclScope | Scope::TryScope | |
| Scope::CompoundStmtScope | |
| (FnTry ? Scope::FnTryCatchScope : 0))); |
| if (TryBlock.isInvalid()) |
| return TryBlock; |
| |
| // Borland allows SEH-handlers with 'try' |
| |
| if ((Tok.is(tok::identifier) && |
| Tok.getIdentifierInfo() == getSEHExceptKeyword()) || |
| Tok.is(tok::kw___finally)) { |
| // TODO: Factor into common return ParseSEHHandlerCommon(...) |
| StmtResult Handler; |
| if(Tok.getIdentifierInfo() == getSEHExceptKeyword()) { |
| SourceLocation Loc = ConsumeToken(); |
| Handler = ParseSEHExceptBlock(Loc); |
| } |
| else { |
| SourceLocation Loc = ConsumeToken(); |
| Handler = ParseSEHFinallyBlock(Loc); |
| } |
| if(Handler.isInvalid()) |
| return Handler; |
| |
| return Actions.ActOnSEHTryBlock(true /* IsCXXTry */, |
| TryLoc, |
| TryBlock.get(), |
| Handler.get()); |
| } |
| else { |
| StmtVector Handlers; |
| |
| // C++11 attributes can't appear here, despite this context seeming |
| // statement-like. |
| DiagnoseAndSkipCXX11Attributes(); |
| |
| if (Tok.isNot(tok::kw_catch)) |
| return StmtError(Diag(Tok, diag::err_expected_catch)); |
| while (Tok.is(tok::kw_catch)) { |
| StmtResult Handler(ParseCXXCatchBlock(FnTry)); |
| if (!Handler.isInvalid()) |
| Handlers.push_back(Handler.get()); |
| } |
| // Don't bother creating the full statement if we don't have any usable |
| // handlers. |
| if (Handlers.empty()) |
| return StmtError(); |
| |
| return Actions.ActOnCXXTryBlock(TryLoc, TryBlock.get(), Handlers); |
| } |
| } |
| |
| /// ParseCXXCatchBlock - Parse a C++ catch block, called handler in the standard |
| /// |
| /// handler: |
| /// 'catch' '(' exception-declaration ')' compound-statement |
| /// |
| /// exception-declaration: |
| /// attribute-specifier-seq[opt] type-specifier-seq declarator |
| /// attribute-specifier-seq[opt] type-specifier-seq abstract-declarator[opt] |
| /// '...' |
| /// |
| StmtResult Parser::ParseCXXCatchBlock(bool FnCatch) { |
| assert(Tok.is(tok::kw_catch) && "Expected 'catch'"); |
| |
| SourceLocation CatchLoc = ConsumeToken(); |
| |
| BalancedDelimiterTracker T(*this, tok::l_paren); |
| if (T.expectAndConsume()) |
| return StmtError(); |
| |
| // C++ 3.3.2p3: |
| // The name in a catch exception-declaration is local to the handler and |
| // shall not be redeclared in the outermost block of the handler. |
| ParseScope CatchScope(this, Scope::DeclScope | Scope::ControlScope | |
| Scope::CatchScope | |
| (FnCatch ? Scope::FnTryCatchScope : 0)); |
| |
| // exception-declaration is equivalent to '...' or a parameter-declaration |
| // without default arguments. |
| Decl *ExceptionDecl = nullptr; |
| if (Tok.isNot(tok::ellipsis)) { |
| ParsedAttributesWithRange Attributes(AttrFactory); |
| MaybeParseCXX11Attributes(Attributes); |
| |
| DeclSpec DS(AttrFactory); |
| DS.takeAttributesFrom(Attributes); |
| |
| if (ParseCXXTypeSpecifierSeq(DS)) |
| return StmtError(); |
| |
| Declarator ExDecl(DS, DeclaratorContext::CXXCatchContext); |
| ParseDeclarator(ExDecl); |
| ExceptionDecl = Actions.ActOnExceptionDeclarator(getCurScope(), ExDecl); |
| } else |
| ConsumeToken(); |
| |
| T.consumeClose(); |
| if (T.getCloseLocation().isInvalid()) |
| return StmtError(); |
| |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected) << tok::l_brace); |
| |
| // FIXME: Possible draft standard bug: attribute-specifier should be allowed? |
| StmtResult Block(ParseCompoundStatement()); |
| if (Block.isInvalid()) |
| return Block; |
| |
| return Actions.ActOnCXXCatchBlock(CatchLoc, ExceptionDecl, Block.get()); |
| } |
| |
| void Parser::ParseMicrosoftIfExistsStatement(StmtVector &Stmts) { |
| IfExistsCondition Result; |
| if (ParseMicrosoftIfExistsCondition(Result)) |
| return; |
| |
| // Handle dependent statements by parsing the braces as a compound statement. |
| // This is not the same behavior as Visual C++, which don't treat this as a |
| // compound statement, but for Clang's type checking we can't have anything |
| // inside these braces escaping to the surrounding code. |
| if (Result.Behavior == IEB_Dependent) { |
| if (!Tok.is(tok::l_brace)) { |
| Diag(Tok, diag::err_expected) << tok::l_brace; |
| return; |
| } |
| |
| StmtResult Compound = ParseCompoundStatement(); |
| if (Compound.isInvalid()) |
| return; |
| |
| StmtResult DepResult = Actions.ActOnMSDependentExistsStmt(Result.KeywordLoc, |
| Result.IsIfExists, |
| Result.SS, |
| Result.Name, |
| Compound.get()); |
| if (DepResult.isUsable()) |
| Stmts.push_back(DepResult.get()); |
| return; |
| } |
| |
| BalancedDelimiterTracker Braces(*this, tok::l_brace); |
| if (Braces.consumeOpen()) { |
| Diag(Tok, diag::err_expected) << tok::l_brace; |
| return; |
| } |
| |
| switch (Result.Behavior) { |
| case IEB_Parse: |
| // Parse the statements below. |
| break; |
| |
| case IEB_Dependent: |
| llvm_unreachable("Dependent case handled above"); |
| |
| case IEB_Skip: |
| Braces.skipToEnd(); |
| return; |
| } |
| |
| // Condition is true, parse the statements. |
| while (Tok.isNot(tok::r_brace)) { |
| StmtResult R = |
| ParseStatementOrDeclaration(Stmts, ParsedStmtContext::Compound); |
| if (R.isUsable()) |
| Stmts.push_back(R.get()); |
| } |
| Braces.consumeClose(); |
| } |
| |
| bool Parser::ParseOpenCLUnrollHintAttribute(ParsedAttributes &Attrs) { |
| MaybeParseGNUAttributes(Attrs); |
| |
| if (Attrs.empty()) |
| return true; |
| |
| if (Attrs.begin()->getKind() != ParsedAttr::AT_OpenCLUnrollHint) |
| return true; |
| |
| if (!(Tok.is(tok::kw_for) || Tok.is(tok::kw_while) || Tok.is(tok::kw_do))) { |
| Diag(Tok, diag::err_opencl_unroll_hint_on_non_loop); |
| return false; |
| } |
| return true; |
| } |