| //===--- ParseStmt.cpp - Statement and Block Parser -----------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Statement and Block portions of the Parser |
| // interface. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Parse/Parser.h" |
| #include "RAIIObjectsForParser.h" |
| #include "clang/Sema/DeclSpec.h" |
| #include "clang/Sema/PrettyDeclStackTrace.h" |
| #include "clang/Sema/Scope.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/PrettyStackTrace.h" |
| #include "clang/Basic/SourceManager.h" |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // C99 6.8: Statements and Blocks. |
| //===----------------------------------------------------------------------===// |
| |
| /// 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 |
| /// [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, bool OnlyStatement) { |
| const char *SemiError = 0; |
| StmtResult Res; |
| |
| ParenBraceBracketBalancer BalancerRAIIObj(*this); |
| |
| ParsedAttributesWithRange attrs; |
| MaybeParseCXX0XAttributes(attrs); |
| |
| // 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. |
| tok::TokenKind Kind = Tok.getKind(); |
| SourceLocation AtLoc; |
| switch (Kind) { |
| case tok::at: // May be a @try or @throw statement |
| { |
| AtLoc = ConsumeToken(); // consume @ |
| return ParseObjCAtStatement(AtLoc); |
| } |
| |
| case tok::code_completion: |
| Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Statement); |
| ConsumeCodeCompletionToken(); |
| return ParseStatementOrDeclaration(Stmts, OnlyStatement); |
| |
| case tok::identifier: |
| if (NextToken().is(tok::colon)) { // C99 6.8.1: labeled-statement |
| // identifier ':' statement |
| return ParseLabeledStatement(attrs); |
| } |
| // PASS THROUGH. |
| |
| default: { |
| if ((getLang().CPlusPlus || !OnlyStatement) && isDeclarationStatement()) { |
| SourceLocation DeclStart = Tok.getLocation(), DeclEnd; |
| DeclGroupPtrTy Decl = ParseDeclaration(Stmts, Declarator::BlockContext, |
| DeclEnd, attrs); |
| return Actions.ActOnDeclStmt(Decl, DeclStart, DeclEnd); |
| } |
| |
| if (Tok.is(tok::r_brace)) { |
| Diag(Tok, diag::err_expected_statement); |
| return StmtError(); |
| } |
| |
| // FIXME: Use the attributes |
| // 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=*/true, /*DontConsume=*/true); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| return StmtError(); |
| } |
| // Otherwise, eat the semicolon. |
| ExpectAndConsumeSemi(diag::err_expected_semi_after_expr); |
| return Actions.ActOnExprStmt(Actions.MakeFullExpr(Expr.get())); |
| } |
| |
| case tok::kw_case: // C99 6.8.1: labeled-statement |
| return ParseCaseStatement(attrs); |
| case tok::kw_default: // C99 6.8.1: labeled-statement |
| return ParseDefaultStatement(attrs); |
| |
| case tok::l_brace: // C99 6.8.2: compound-statement |
| return ParseCompoundStatement(attrs); |
| case tok::semi: { // C99 6.8.3p3: expression[opt] ';' |
| bool LeadingEmptyMacro = Tok.hasLeadingEmptyMacro(); |
| return Actions.ActOnNullStmt(ConsumeToken(), LeadingEmptyMacro); |
| } |
| |
| case tok::kw_if: // C99 6.8.4.1: if-statement |
| return ParseIfStatement(attrs); |
| case tok::kw_switch: // C99 6.8.4.2: switch-statement |
| return ParseSwitchStatement(attrs); |
| |
| case tok::kw_while: // C99 6.8.5.1: while-statement |
| return ParseWhileStatement(attrs); |
| case tok::kw_do: // C99 6.8.5.2: do-statement |
| Res = ParseDoStatement(attrs); |
| SemiError = "do/while"; |
| break; |
| case tok::kw_for: // C99 6.8.5.3: for-statement |
| return ParseForStatement(attrs); |
| |
| case tok::kw_goto: // C99 6.8.6.1: goto-statement |
| Res = ParseGotoStatement(attrs); |
| SemiError = "goto"; |
| break; |
| case tok::kw_continue: // C99 6.8.6.2: continue-statement |
| Res = ParseContinueStatement(attrs); |
| SemiError = "continue"; |
| break; |
| case tok::kw_break: // C99 6.8.6.3: break-statement |
| Res = ParseBreakStatement(attrs); |
| SemiError = "break"; |
| break; |
| case tok::kw_return: // C99 6.8.6.4: return-statement |
| Res = ParseReturnStatement(attrs); |
| SemiError = "return"; |
| break; |
| |
| case tok::kw_asm: { |
| ProhibitAttributes(attrs); |
| bool msAsm = false; |
| Res = ParseAsmStatement(msAsm); |
| Res = Actions.ActOnFinishFullStmt(Res.get()); |
| if (msAsm) return move(Res); |
| SemiError = "asm"; |
| break; |
| } |
| |
| case tok::kw_try: // C++ 15: try-block |
| return ParseCXXTryBlock(attrs); |
| } |
| |
| // If we reached this code, the statement must end in a semicolon. |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else if (!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, true, true); |
| } |
| |
| return move(Res); |
| } |
| |
| /// ParseLabeledStatement - We have an identifier and a ':' after it. |
| /// |
| /// labeled-statement: |
| /// identifier ':' statement |
| /// [GNU] identifier ':' attributes[opt] statement |
| /// |
| StmtResult Parser::ParseLabeledStatement(ParsedAttributes &attrs) { |
| assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() && |
| "Not an identifier!"); |
| |
| 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. |
| MaybeParseGNUAttributes(attrs); |
| |
| StmtResult SubStmt(ParseStatement()); |
| |
| // Broken substmt shouldn't prevent the label from being added to the AST. |
| if (SubStmt.isInvalid()) |
| SubStmt = Actions.ActOnNullStmt(ColonLoc); |
| |
| return Actions.ActOnLabelStmt(IdentTok.getLocation(), |
| IdentTok.getIdentifierInfo(), |
| ColonLoc, SubStmt.get(), attrs.getList()); |
| } |
| |
| /// ParseCaseStatement |
| /// labeled-statement: |
| /// 'case' constant-expression ':' statement |
| /// [GNU] 'case' constant-expression '...' constant-expression ':' statement |
| /// |
| StmtResult Parser::ParseCaseStatement(ParsedAttributes &attrs) { |
| assert(Tok.is(tok::kw_case) && "Not a case stmt!"); |
| // FIXME: Use attributes? |
| |
| // 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 |
| // wierdness 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. |
| StmtTy *DeepestParsedCaseStmt = 0; |
| |
| // While we have case statements, eat and stack them. |
| do { |
| SourceLocation CaseLoc = ConsumeToken(); // eat the 'case'. |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteCase(getCurScope()); |
| ConsumeCodeCompletionToken(); |
| } |
| |
| /// 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(ParseConstantExpression()); |
| if (LHS.isInvalid()) { |
| SkipUntil(tok::colon); |
| return StmtError(); |
| } |
| |
| // GNU case range extension. |
| SourceLocation DotDotDotLoc; |
| ExprResult RHS; |
| if (Tok.is(tok::ellipsis)) { |
| Diag(Tok, diag::ext_gnu_case_range); |
| DotDotDotLoc = ConsumeToken(); |
| |
| RHS = ParseConstantExpression(); |
| if (RHS.isInvalid()) { |
| SkipUntil(tok::colon); |
| return StmtError(); |
| } |
| } |
| |
| ColonProtection.restore(); |
| |
| SourceLocation ColonLoc; |
| if (Tok.isNot(tok::colon)) { |
| SourceLocation ExpectedLoc = PP.getLocForEndOfToken(PrevTokLocation); |
| Diag(ExpectedLoc, diag::err_expected_colon_after) << "'case'" |
| << FixItHint::CreateInsertion(ExpectedLoc, ":"); |
| ColonLoc = ExpectedLoc; |
| } else { |
| ColonLoc = ConsumeToken(); |
| } |
| |
| StmtResult Case = |
| Actions.ActOnCaseStmt(CaseLoc, LHS.get(), DotDotDotLoc, |
| RHS.get(), 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(); |
| // 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 = move(Case); |
| else |
| Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, Case.get()); |
| DeepestParsedCaseStmt = NextDeepest; |
| } |
| |
| // Handle all case statements. |
| } while (Tok.is(tok::kw_case)); |
| |
| assert(!TopLevelCase.isInvalid() && "Should have parsed at least one case!"); |
| |
| // If we found a non-case statement, start by parsing it. |
| StmtResult SubStmt; |
| |
| if (Tok.isNot(tok::r_brace)) { |
| SubStmt = ParseStatement(); |
| } else { |
| // Nicely diagnose the common error "switch (X) { case 4: }", which is |
| // not valid. |
| // FIXME: add insertion hint. |
| Diag(Tok, diag::err_label_end_of_compound_statement); |
| SubStmt = true; |
| } |
| |
| // Broken sub-stmt shouldn't prevent forming the case statement properly. |
| if (SubStmt.isInvalid()) |
| SubStmt = Actions.ActOnNullStmt(SourceLocation()); |
| |
| // Install the body into the most deeply-nested case. |
| Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, SubStmt.get()); |
| |
| // Return the top level parsed statement tree. |
| return move(TopLevelCase); |
| } |
| |
| /// ParseDefaultStatement |
| /// labeled-statement: |
| /// 'default' ':' statement |
| /// Note that this does not parse the 'statement' at the end. |
| /// |
| StmtResult Parser::ParseDefaultStatement(ParsedAttributes &attrs) { |
| //FIXME: Use attributes? |
| |
| assert(Tok.is(tok::kw_default) && "Not a default stmt!"); |
| SourceLocation DefaultLoc = ConsumeToken(); // eat the 'default'. |
| |
| SourceLocation ColonLoc; |
| if (Tok.isNot(tok::colon)) { |
| SourceLocation ExpectedLoc = PP.getLocForEndOfToken(PrevTokLocation); |
| Diag(ExpectedLoc, diag::err_expected_colon_after) << "'default'" |
| << FixItHint::CreateInsertion(ExpectedLoc, ":"); |
| ColonLoc = ExpectedLoc; |
| } else { |
| ColonLoc = ConsumeToken(); |
| } |
| |
| // Diagnose the common error "switch (X) {... default: }", which is not valid. |
| if (Tok.is(tok::r_brace)) { |
| Diag(Tok, diag::err_label_end_of_compound_statement); |
| return StmtError(); |
| } |
| |
| StmtResult SubStmt(ParseStatement()); |
| if (SubStmt.isInvalid()) |
| return StmtError(); |
| |
| return Actions.ActOnDefaultStmt(DefaultLoc, ColonLoc, |
| SubStmt.get(), getCurScope()); |
| } |
| |
| |
| /// 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 |
| /// [OMP] openmp-directive [TODO] |
| /// |
| /// [GNU] label-declarations: |
| /// [GNU] label-declaration |
| /// [GNU] label-declarations label-declaration |
| /// |
| /// [GNU] label-declaration: |
| /// [GNU] '__label__' identifier-list ';' |
| /// |
| /// [OMP] openmp-directive: [TODO] |
| /// [OMP] barrier-directive |
| /// [OMP] flush-directive |
| /// |
| StmtResult Parser::ParseCompoundStatement(ParsedAttributes &attrs, |
| bool isStmtExpr) { |
| //FIXME: Use attributes? |
| |
| 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, Scope::DeclScope); |
| |
| // Parse the statements in the body. |
| return ParseCompoundStatementBody(isStmtExpr); |
| } |
| |
| |
| /// 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 ('{}')"); |
| InMessageExpressionRAIIObject InMessage(*this, false); |
| |
| SourceLocation LBraceLoc = ConsumeBrace(); // eat the '{'. |
| |
| // TODO: "__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. |
| |
| StmtVector Stmts(Actions); |
| while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { |
| StmtResult R; |
| if (Tok.isNot(tok::kw___extension__)) { |
| R = ParseStatementOrDeclaration(Stmts, false); |
| } 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; |
| MaybeParseCXX0XAttributes(attrs); |
| |
| // 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(Stmts, |
| Declarator::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; |
| } |
| |
| // FIXME: Use attributes? |
| // Eat the semicolon at the end of stmt and convert the expr into a |
| // statement. |
| ExpectAndConsumeSemi(diag::err_expected_semi_after_expr); |
| R = Actions.ActOnExprStmt(Actions.MakeFullExpr(Res.get())); |
| } |
| } |
| |
| if (R.isUsable()) |
| Stmts.push_back(R.release()); |
| } |
| |
| // We broke out of the while loop because we found a '}' or EOF. |
| if (Tok.isNot(tok::r_brace)) { |
| Diag(Tok, diag::err_expected_rbrace); |
| Diag(LBraceLoc, diag::note_matching) << "{"; |
| return StmtError(); |
| } |
| |
| SourceLocation RBraceLoc = ConsumeBrace(); |
| return Actions.ActOnCompoundStmt(LBraceLoc, RBraceLoc, move_arg(Stmts), |
| isStmtExpr); |
| } |
| |
| /// ParseParenExprOrCondition: |
| /// [C ] '(' expression ')' |
| /// [C++] '(' condition ')' [not allowed if OnlyAllowCondition=true] |
| /// |
| /// 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. |
| bool Parser::ParseParenExprOrCondition(ExprResult &ExprResult, |
| Decl *&DeclResult, |
| SourceLocation Loc, |
| bool ConvertToBoolean) { |
| bool ParseError = false; |
| |
| SourceLocation LParenLoc = ConsumeParen(); |
| if (getLang().CPlusPlus) |
| ParseError = ParseCXXCondition(ExprResult, DeclResult, Loc, |
| ConvertToBoolean); |
| else { |
| ExprResult = ParseExpression(); |
| DeclResult = 0; |
| |
| // If required, convert to a boolean value. |
| if (!ExprResult.isInvalid() && ConvertToBoolean) |
| ExprResult |
| = Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprResult.get()); |
| } |
| |
| // 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 (ExprResult.isInvalid() && !DeclResult && 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. |
| MatchRHSPunctuation(tok::r_paren, LParenLoc); |
| return false; |
| } |
| |
| |
| /// 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(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| assert(Tok.is(tok::kw_if) && "Not an if stmt!"); |
| SourceLocation IfLoc = ConsumeToken(); // eat the 'if'. |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "if"; |
| SkipUntil(tok::semi); |
| return StmtError(); |
| } |
| |
| bool C99orCXX = getLang().C99 || getLang().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. |
| ExprResult CondExp; |
| Decl *CondVar = 0; |
| if (ParseParenExprOrCondition(CondExp, CondVar, IfLoc, true)) |
| return StmtError(); |
| |
| FullExprArg FullCondExp(Actions.MakeFullExpr(CondExp.get())); |
| |
| // 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 && Tok.isNot(tok::l_brace)); |
| |
| // Read the 'then' stmt. |
| SourceLocation ThenStmtLoc = Tok.getLocation(); |
| StmtResult ThenStmt(ParseStatement()); |
| |
| // 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)) { |
| 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.isNot(tok::l_brace)); |
| |
| ElseStmt = ParseStatement(); |
| |
| // Pop the 'else' scope if needed. |
| InnerScope.Exit(); |
| } |
| |
| IfScope.Exit(); |
| |
| // If the condition was invalid, discard the if statement. We could recover |
| // better by replacing it with a valid expr, but don't do that yet. |
| if (CondExp.isInvalid() && !CondVar) |
| return StmtError(); |
| |
| // 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() == 0) || |
| (ThenStmt.get() == 0 && 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, FullCondExp, CondVar, ThenStmt.get(), |
| ElseLoc, ElseStmt.get()); |
| } |
| |
| /// ParseSwitchStatement |
| /// switch-statement: |
| /// 'switch' '(' expression ')' statement |
| /// [C++] 'switch' '(' condition ')' statement |
| StmtResult Parser::ParseSwitchStatement(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| 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 = getLang().C99 || getLang().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::BreakScope; |
| if (C99orCXX) |
| ScopeFlags |= Scope::DeclScope | Scope::ControlScope; |
| ParseScope SwitchScope(this, ScopeFlags); |
| |
| // Parse the condition. |
| ExprResult Cond; |
| Decl *CondVar = 0; |
| if (ParseParenExprOrCondition(Cond, CondVar, SwitchLoc, false)) |
| return StmtError(); |
| |
| StmtResult Switch |
| = Actions.ActOnStartOfSwitchStmt(SwitchLoc, Cond.get(), CondVar); |
| |
| 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, false, false); |
| } else |
| SkipUntil(tok::semi); |
| return move(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++. |
| // |
| ParseScope InnerScope(this, Scope::DeclScope, |
| C99orCXX && Tok.isNot(tok::l_brace)); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement()); |
| |
| // Pop the scopes. |
| InnerScope.Exit(); |
| SwitchScope.Exit(); |
| |
| if (Body.isInvalid()) |
| // FIXME: Remove the case statement list from the Switch statement. |
| Body = Actions.ActOnNullStmt(Tok.getLocation()); |
| |
| 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(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| 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 = getLang().C99 || getLang().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. |
| ExprResult Cond; |
| Decl *CondVar = 0; |
| if (ParseParenExprOrCondition(Cond, CondVar, WhileLoc, true)) |
| return StmtError(); |
| |
| FullExprArg FullCond(Actions.MakeFullExpr(Cond.get())); |
| |
| // C99 6.8.5p5 - 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++ 6.5p2: |
| // 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.isNot(tok::l_brace)); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement()); |
| |
| // Pop the body scope if needed. |
| InnerScope.Exit(); |
| WhileScope.Exit(); |
| |
| if ((Cond.isInvalid() && !CondVar) || Body.isInvalid()) |
| return StmtError(); |
| |
| return Actions.ActOnWhileStmt(WhileLoc, FullCond, CondVar, 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(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| 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 (getLang().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 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++ 6.5p2: |
| // The substatement in an iteration-statement implicitly defines a local scope |
| // which is entered and exited each time through the loop. |
| // |
| ParseScope InnerScope(this, Scope::DeclScope, |
| (getLang().C99 || getLang().CPlusPlus) && |
| Tok.isNot(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, false, true); |
| } |
| return StmtError(); |
| } |
| SourceLocation WhileLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "do/while"; |
| SkipUntil(tok::semi, false, true); |
| return StmtError(); |
| } |
| |
| // Parse the parenthesized condition. |
| SourceLocation LPLoc = ConsumeParen(); |
| ExprResult Cond = ParseExpression(); |
| SourceLocation RPLoc = MatchRHSPunctuation(tok::r_paren, LPLoc); |
| DoScope.Exit(); |
| |
| if (Cond.isInvalid() || Body.isInvalid()) |
| return StmtError(); |
| |
| return Actions.ActOnDoStmt(DoLoc, Body.get(), WhileLoc, LPLoc, |
| Cond.get(), RPLoc); |
| } |
| |
| /// 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 |
| /// [OBJC2] 'for' '(' declaration 'in' expr ')' statement |
| /// [OBJC2] 'for' '(' expr 'in' expr ')' statement |
| /// |
| /// [C++] for-init-statement: |
| /// [C++] expression-statement |
| /// [C++] simple-declaration |
| /// |
| StmtResult Parser::ParseForStatement(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| assert(Tok.is(tok::kw_for) && "Not a for stmt!"); |
| SourceLocation ForLoc = ConsumeToken(); // eat the 'for'. |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "for"; |
| SkipUntil(tok::semi); |
| return StmtError(); |
| } |
| |
| bool C99orCXXorObjC = getLang().C99 || getLang().CPlusPlus || getLang().ObjC1; |
| |
| // 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; |
| if (C99orCXXorObjC) |
| ScopeFlags = Scope::BreakScope | Scope::ContinueScope | |
| Scope::DeclScope | Scope::ControlScope; |
| else |
| ScopeFlags = Scope::BreakScope | Scope::ContinueScope; |
| |
| ParseScope ForScope(this, ScopeFlags); |
| |
| SourceLocation LParenLoc = ConsumeParen(); |
| ExprResult Value; |
| |
| bool ForEach = false; |
| StmtResult FirstPart; |
| bool SecondPartIsInvalid = false; |
| FullExprArg SecondPart(Actions); |
| ExprResult Collection; |
| FullExprArg ThirdPart(Actions); |
| Decl *SecondVar = 0; |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteOrdinaryName(getCurScope(), |
| C99orCXXorObjC? Sema::PCC_ForInit |
| : Sema::PCC_Expression); |
| ConsumeCodeCompletionToken(); |
| } |
| |
| // Parse the first part of the for specifier. |
| if (Tok.is(tok::semi)) { // for (; |
| // no first part, eat the ';'. |
| ConsumeToken(); |
| } else if (isSimpleDeclaration()) { // for (int X = 4; |
| // 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); |
| |
| ParsedAttributesWithRange attrs; |
| MaybeParseCXX0XAttributes(attrs); |
| |
| SourceLocation DeclStart = Tok.getLocation(), DeclEnd; |
| StmtVector Stmts(Actions); |
| DeclGroupPtrTy DG = ParseSimpleDeclaration(Stmts, Declarator::ForContext, |
| DeclEnd, attrs, false); |
| FirstPart = Actions.ActOnDeclStmt(DG, DeclStart, Tok.getLocation()); |
| |
| 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); |
| ConsumeCodeCompletionToken(); |
| } |
| Collection = ParseExpression(); |
| } else { |
| Diag(Tok, diag::err_expected_semi_for); |
| SkipUntil(tok::semi); |
| } |
| } else { |
| Value = ParseExpression(); |
| |
| ForEach = isTokIdentifier_in(); |
| |
| // Turn the expression into a stmt. |
| if (!Value.isInvalid()) { |
| if (ForEach) |
| FirstPart = Actions.ActOnForEachLValueExpr(Value.get()); |
| else |
| FirstPart = Actions.ActOnExprStmt(Actions.MakeFullExpr(Value.get())); |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else if (ForEach) { |
| ConsumeToken(); // consume 'in' |
| |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteObjCForCollection(getCurScope(), DeclGroupPtrTy()); |
| ConsumeCodeCompletionToken(); |
| } |
| Collection = ParseExpression(); |
| } else { |
| if (!Value.isInvalid()) Diag(Tok, diag::err_expected_semi_for); |
| SkipUntil(tok::semi); |
| } |
| } |
| if (!ForEach) { |
| assert(!SecondPart.get() && "Shouldn't have a second expression yet."); |
| // Parse the second part of the for specifier. |
| if (Tok.is(tok::semi)) { // for (...;; |
| // no second part. |
| } else { |
| ExprResult Second; |
| if (getLang().CPlusPlus) |
| ParseCXXCondition(Second, SecondVar, ForLoc, true); |
| else { |
| Second = ParseExpression(); |
| if (!Second.isInvalid()) |
| Second = Actions.ActOnBooleanCondition(getCurScope(), ForLoc, |
| Second.get()); |
| } |
| SecondPartIsInvalid = Second.isInvalid(); |
| SecondPart = Actions.MakeFullExpr(Second.get()); |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else { |
| if (!SecondPartIsInvalid || SecondVar) |
| Diag(Tok, diag::err_expected_semi_for); |
| SkipUntil(tok::semi); |
| } |
| |
| // Parse the third part of the for specifier. |
| if (Tok.isNot(tok::r_paren)) { // for (...;...;) |
| ExprResult Third = ParseExpression(); |
| ThirdPart = Actions.MakeFullExpr(Third.take()); |
| } |
| } |
| // Match the ')'. |
| SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); |
| |
| // C99 6.8.5p5 - 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++ 6.5p2: |
| // 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.isNot(tok::l_brace)); |
| |
| // Read the body statement. |
| StmtResult Body(ParseStatement()); |
| |
| // Pop the body scope if needed. |
| InnerScope.Exit(); |
| |
| // Leave the for-scope. |
| ForScope.Exit(); |
| |
| if (Body.isInvalid()) |
| return StmtError(); |
| |
| if (!ForEach) |
| return Actions.ActOnForStmt(ForLoc, LParenLoc, FirstPart.take(), SecondPart, |
| SecondVar, ThirdPart, RParenLoc, Body.take()); |
| |
| // FIXME: It isn't clear how to communicate the late destruction of |
| // C++ temporaries used to create the collection. |
| return Actions.ActOnObjCForCollectionStmt(ForLoc, LParenLoc, FirstPart.take(), |
| Collection.take(), RParenLoc, |
| Body.take()); |
| } |
| |
| /// ParseGotoStatement |
| /// jump-statement: |
| /// 'goto' identifier ';' |
| /// [GNU] 'goto' '*' expression ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| StmtResult Parser::ParseGotoStatement(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| assert(Tok.is(tok::kw_goto) && "Not a goto stmt!"); |
| SourceLocation GotoLoc = ConsumeToken(); // eat the 'goto'. |
| |
| StmtResult Res; |
| if (Tok.is(tok::identifier)) { |
| Res = Actions.ActOnGotoStmt(GotoLoc, Tok.getLocation(), |
| Tok.getIdentifierInfo()); |
| 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, false, true); |
| return StmtError(); |
| } |
| Res = Actions.ActOnIndirectGotoStmt(GotoLoc, StarLoc, R.take()); |
| } else { |
| Diag(Tok, diag::err_expected_ident); |
| return StmtError(); |
| } |
| |
| return move(Res); |
| } |
| |
| /// ParseContinueStatement |
| /// jump-statement: |
| /// 'continue' ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| StmtResult Parser::ParseContinueStatement(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| 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(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| SourceLocation BreakLoc = ConsumeToken(); // eat the 'break'. |
| return Actions.ActOnBreakStmt(BreakLoc, getCurScope()); |
| } |
| |
| /// ParseReturnStatement |
| /// jump-statement: |
| /// 'return' expression[opt] ';' |
| StmtResult Parser::ParseReturnStatement(ParsedAttributes &attrs) { |
| // FIXME: Use attributes? |
| |
| assert(Tok.is(tok::kw_return) && "Not a return stmt!"); |
| SourceLocation ReturnLoc = ConsumeToken(); // eat the 'return'. |
| |
| ExprResult R; |
| if (Tok.isNot(tok::semi)) { |
| if (Tok.is(tok::code_completion)) { |
| Actions.CodeCompleteReturn(getCurScope()); |
| ConsumeCodeCompletionToken(); |
| SkipUntil(tok::semi, false, true); |
| return StmtError(); |
| } |
| |
| R = ParseExpression(); |
| if (R.isInvalid()) { // Skip to the semicolon, but don't consume it. |
| SkipUntil(tok::semi, false, true); |
| return StmtError(); |
| } |
| } |
| return Actions.ActOnReturnStmt(ReturnLoc, R.take()); |
| } |
| |
| /// FuzzyParseMicrosoftAsmStatement. When -fms-extensions is enabled, this |
| /// routine is called to skip/ignore tokens that comprise the MS asm statement. |
| StmtResult Parser::FuzzyParseMicrosoftAsmStatement(SourceLocation AsmLoc) { |
| SourceLocation EndLoc; |
| if (Tok.is(tok::l_brace)) { |
| unsigned short savedBraceCount = BraceCount; |
| do { |
| EndLoc = Tok.getLocation(); |
| ConsumeAnyToken(); |
| } while (BraceCount > savedBraceCount && Tok.isNot(tok::eof)); |
| } else { |
| // From the MS website: If used without braces, the __asm keyword means |
| // that the rest of the line is an assembly-language statement. |
| SourceManager &SrcMgr = PP.getSourceManager(); |
| SourceLocation TokLoc = Tok.getLocation(); |
| unsigned LineNo = SrcMgr.getInstantiationLineNumber(TokLoc); |
| do { |
| EndLoc = TokLoc; |
| ConsumeAnyToken(); |
| TokLoc = Tok.getLocation(); |
| } while ((SrcMgr.getInstantiationLineNumber(TokLoc) == LineNo) && |
| Tok.isNot(tok::r_brace) && Tok.isNot(tok::semi) && |
| Tok.isNot(tok::eof)); |
| } |
| Token t; |
| t.setKind(tok::string_literal); |
| t.setLiteralData("\"/*FIXME: not done*/\""); |
| t.clearFlag(Token::NeedsCleaning); |
| t.setLength(21); |
| ExprResult AsmString(Actions.ActOnStringLiteral(&t, 1)); |
| ExprVector Constraints(Actions); |
| ExprVector Exprs(Actions); |
| ExprVector Clobbers(Actions); |
| return Actions.ActOnAsmStmt(AsmLoc, true, true, 0, 0, 0, |
| move_arg(Constraints), move_arg(Exprs), |
| AsmString.take(), move_arg(Clobbers), |
| EndLoc, true); |
| } |
| |
| /// ParseAsmStatement - Parse a GNU extended asm statement. |
| /// asm-statement: |
| /// gnu-asm-statement |
| /// ms-asm-statement |
| /// |
| /// [GNU] gnu-asm-statement: |
| /// 'asm' type-qualifier[opt] '(' asm-argument ')' ';' |
| /// |
| /// [GNU] asm-argument: |
| /// asm-string-literal |
| /// asm-string-literal ':' asm-operands[opt] |
| /// asm-string-literal ':' asm-operands[opt] ':' asm-operands[opt] |
| /// asm-string-literal ':' asm-operands[opt] ':' asm-operands[opt] |
| /// ':' asm-clobbers |
| /// |
| /// [GNU] asm-clobbers: |
| /// asm-string-literal |
| /// asm-clobbers ',' asm-string-literal |
| /// |
| /// [MS] ms-asm-statement: |
| /// '__asm' assembly-instruction ';'[opt] |
| /// '__asm' '{' assembly-instruction-list '}' ';'[opt] |
| /// |
| /// [MS] assembly-instruction-list: |
| /// assembly-instruction ';'[opt] |
| /// assembly-instruction-list ';' assembly-instruction ';'[opt] |
| /// |
| StmtResult Parser::ParseAsmStatement(bool &msAsm) { |
| assert(Tok.is(tok::kw_asm) && "Not an asm stmt"); |
| SourceLocation AsmLoc = ConsumeToken(); |
| |
| if (getLang().Microsoft && Tok.isNot(tok::l_paren) && !isTypeQualifier()) { |
| msAsm = true; |
| return FuzzyParseMicrosoftAsmStatement(AsmLoc); |
| } |
| DeclSpec DS; |
| SourceLocation Loc = Tok.getLocation(); |
| ParseTypeQualifierListOpt(DS, true, false); |
| |
| // GNU asms accept, but warn, about type-qualifiers other than volatile. |
| if (DS.getTypeQualifiers() & DeclSpec::TQ_const) |
| Diag(Loc, diag::w_asm_qualifier_ignored) << "const"; |
| if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) |
| Diag(Loc, diag::w_asm_qualifier_ignored) << "restrict"; |
| |
| // Remember if this was a volatile asm. |
| bool isVolatile = DS.getTypeQualifiers() & DeclSpec::TQ_volatile; |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "asm"; |
| SkipUntil(tok::r_paren); |
| return StmtError(); |
| } |
| Loc = ConsumeParen(); |
| |
| ExprResult AsmString(ParseAsmStringLiteral()); |
| if (AsmString.isInvalid()) |
| return StmtError(); |
| |
| llvm::SmallVector<IdentifierInfo *, 4> Names; |
| ExprVector Constraints(Actions); |
| ExprVector Exprs(Actions); |
| ExprVector Clobbers(Actions); |
| |
| if (Tok.is(tok::r_paren)) { |
| // We have a simple asm expression like 'asm("foo")'. |
| SourceLocation RParenLoc = ConsumeParen(); |
| return Actions.ActOnAsmStmt(AsmLoc, /*isSimple*/ true, isVolatile, |
| /*NumOutputs*/ 0, /*NumInputs*/ 0, 0, |
| move_arg(Constraints), move_arg(Exprs), |
| AsmString.take(), move_arg(Clobbers), |
| RParenLoc); |
| } |
| |
| // Parse Outputs, if present. |
| bool AteExtraColon = false; |
| if (Tok.is(tok::colon) || Tok.is(tok::coloncolon)) { |
| // In C++ mode, parse "::" like ": :". |
| AteExtraColon = Tok.is(tok::coloncolon); |
| ConsumeToken(); |
| |
| if (!AteExtraColon && |
| ParseAsmOperandsOpt(Names, Constraints, Exprs)) |
| return StmtError(); |
| } |
| |
| unsigned NumOutputs = Names.size(); |
| |
| // Parse Inputs, if present. |
| if (AteExtraColon || |
| Tok.is(tok::colon) || Tok.is(tok::coloncolon)) { |
| // In C++ mode, parse "::" like ": :". |
| if (AteExtraColon) |
| AteExtraColon = false; |
| else { |
| AteExtraColon = Tok.is(tok::coloncolon); |
| ConsumeToken(); |
| } |
| |
| if (!AteExtraColon && |
| ParseAsmOperandsOpt(Names, Constraints, Exprs)) |
| return StmtError(); |
| } |
| |
| assert(Names.size() == Constraints.size() && |
| Constraints.size() == Exprs.size() && |
| "Input operand size mismatch!"); |
| |
| unsigned NumInputs = Names.size() - NumOutputs; |
| |
| // Parse the clobbers, if present. |
| if (AteExtraColon || Tok.is(tok::colon)) { |
| if (!AteExtraColon) |
| ConsumeToken(); |
| |
| // Parse the asm-string list for clobbers if present. |
| if (Tok.isNot(tok::r_paren)) { |
| while (1) { |
| ExprResult Clobber(ParseAsmStringLiteral()); |
| |
| if (Clobber.isInvalid()) |
| break; |
| |
| Clobbers.push_back(Clobber.release()); |
| |
| if (Tok.isNot(tok::comma)) break; |
| ConsumeToken(); |
| } |
| } |
| } |
| |
| SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, Loc); |
| return Actions.ActOnAsmStmt(AsmLoc, false, isVolatile, |
| NumOutputs, NumInputs, Names.data(), |
| move_arg(Constraints), move_arg(Exprs), |
| AsmString.take(), move_arg(Clobbers), |
| RParenLoc); |
| } |
| |
| /// ParseAsmOperands - Parse the asm-operands production as used by |
| /// asm-statement, assuming the leading ':' token was eaten. |
| /// |
| /// [GNU] asm-operands: |
| /// asm-operand |
| /// asm-operands ',' asm-operand |
| /// |
| /// [GNU] asm-operand: |
| /// asm-string-literal '(' expression ')' |
| /// '[' identifier ']' asm-string-literal '(' expression ')' |
| /// |
| // |
| // FIXME: Avoid unnecessary std::string trashing. |
| bool Parser::ParseAsmOperandsOpt(llvm::SmallVectorImpl<IdentifierInfo *> &Names, |
| llvm::SmallVectorImpl<ExprTy *> &Constraints, |
| llvm::SmallVectorImpl<ExprTy *> &Exprs) { |
| // 'asm-operands' isn't present? |
| if (!isTokenStringLiteral() && Tok.isNot(tok::l_square)) |
| return false; |
| |
| while (1) { |
| // Read the [id] if present. |
| if (Tok.is(tok::l_square)) { |
| SourceLocation Loc = ConsumeBracket(); |
| |
| if (Tok.isNot(tok::identifier)) { |
| Diag(Tok, diag::err_expected_ident); |
| SkipUntil(tok::r_paren); |
| return true; |
| } |
| |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| ConsumeToken(); |
| |
| Names.push_back(II); |
| MatchRHSPunctuation(tok::r_square, Loc); |
| } else |
| Names.push_back(0); |
| |
| ExprResult Constraint(ParseAsmStringLiteral()); |
| if (Constraint.isInvalid()) { |
| SkipUntil(tok::r_paren); |
| return true; |
| } |
| Constraints.push_back(Constraint.release()); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "asm operand"; |
| SkipUntil(tok::r_paren); |
| return true; |
| } |
| |
| // Read the parenthesized expression. |
| SourceLocation OpenLoc = ConsumeParen(); |
| ExprResult Res(ParseExpression()); |
| MatchRHSPunctuation(tok::r_paren, OpenLoc); |
| if (Res.isInvalid()) { |
| SkipUntil(tok::r_paren); |
| return true; |
| } |
| Exprs.push_back(Res.release()); |
| // Eat the comma and continue parsing if it exists. |
| if (Tok.isNot(tok::comma)) return false; |
| ConsumeToken(); |
| } |
| |
| return true; |
| } |
| |
| Decl *Parser::ParseFunctionStatementBody(Decl *Decl) { |
| assert(Tok.is(tok::l_brace)); |
| SourceLocation LBraceLoc = Tok.getLocation(); |
| |
| if (PP.isCodeCompletionEnabled()) |
| if (trySkippingFunctionBodyForCodeCompletion()) |
| return Actions.ActOnFinishFunctionBody(Decl, 0); |
| |
| PrettyDeclStackTraceEntry CrashInfo(Actions, Decl, LBraceLoc, |
| "parsing function body"); |
| |
| // 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()) |
| FnBody = Actions.ActOnCompoundStmt(LBraceLoc, LBraceLoc, |
| MultiStmtArg(Actions), false); |
| |
| return Actions.ActOnFinishFunctionBody(Decl, FnBody.take()); |
| } |
| |
| /// ParseFunctionTryBlock - Parse a C++ function-try-block. |
| /// |
| /// function-try-block: |
| /// 'try' ctor-initializer[opt] compound-statement handler-seq |
| /// |
| Decl *Parser::ParseFunctionTryBlock(Decl *Decl) { |
| assert(Tok.is(tok::kw_try) && "Expected 'try'"); |
| SourceLocation TryLoc = ConsumeToken(); |
| |
| PrettyDeclStackTraceEntry CrashInfo(Actions, Decl, TryLoc, |
| "parsing function try block"); |
| |
| // Constructor initializer list? |
| if (Tok.is(tok::colon)) |
| ParseConstructorInitializer(Decl); |
| |
| if (PP.isCodeCompletionEnabled()) |
| if (trySkippingFunctionBodyForCodeCompletion()) |
| return Actions.ActOnFinishFunctionBody(Decl, 0); |
| |
| SourceLocation LBraceLoc = Tok.getLocation(); |
| StmtResult FnBody(ParseCXXTryBlockCommon(TryLoc)); |
| // If we failed to parse the try-catch, we just give the function an empty |
| // compound statement as the body. |
| if (FnBody.isInvalid()) |
| FnBody = Actions.ActOnCompoundStmt(LBraceLoc, LBraceLoc, |
| MultiStmtArg(Actions), false); |
| |
| return Actions.ActOnFinishFunctionBody(Decl, FnBody.take()); |
| } |
| |
| bool Parser::trySkippingFunctionBodyForCodeCompletion() { |
| assert(Tok.is(tok::l_brace)); |
| assert(PP.isCodeCompletionEnabled() && |
| "Should only be called when in code-completion mode"); |
| |
| // We're in code-completion mode. Skip parsing for all function bodies unless |
| // the body contains the code-completion point. |
| TentativeParsingAction PA(*this); |
| ConsumeBrace(); |
| if (SkipUntil(tok::r_brace, /*StopAtSemi=*/false, /*DontConsume=*/false, |
| /*StopAtCodeCompletion=*/true)) { |
| PA.Commit(); |
| return true; |
| } |
| |
| PA.Revert(); |
| return false; |
| } |
| |
| /// ParseCXXTryBlock - Parse a C++ try-block. |
| /// |
| /// try-block: |
| /// 'try' compound-statement handler-seq |
| /// |
| StmtResult Parser::ParseCXXTryBlock(ParsedAttributes &attrs) { |
| // FIXME: Add attributes? |
| |
| 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] |
| /// |
| StmtResult Parser::ParseCXXTryBlockCommon(SourceLocation TryLoc) { |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected_lbrace)); |
| // FIXME: Possible draft standard bug: attribute-specifier should be allowed? |
| ParsedAttributesWithRange attrs; |
| StmtResult TryBlock(ParseCompoundStatement(attrs)); |
| if (TryBlock.isInvalid()) |
| return move(TryBlock); |
| |
| StmtVector Handlers(Actions); |
| MaybeParseCXX0XAttributes(attrs); |
| ProhibitAttributes(attrs); |
| |
| if (Tok.isNot(tok::kw_catch)) |
| return StmtError(Diag(Tok, diag::err_expected_catch)); |
| while (Tok.is(tok::kw_catch)) { |
| StmtResult Handler(ParseCXXCatchBlock()); |
| if (!Handler.isInvalid()) |
| Handlers.push_back(Handler.release()); |
| } |
| // 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.take(), move_arg(Handlers)); |
| } |
| |
| /// ParseCXXCatchBlock - Parse a C++ catch block, called handler in the standard |
| /// |
| /// handler: |
| /// 'catch' '(' exception-declaration ')' compound-statement |
| /// |
| /// exception-declaration: |
| /// type-specifier-seq declarator |
| /// type-specifier-seq abstract-declarator |
| /// type-specifier-seq |
| /// '...' |
| /// |
| StmtResult Parser::ParseCXXCatchBlock() { |
| assert(Tok.is(tok::kw_catch) && "Expected 'catch'"); |
| |
| SourceLocation CatchLoc = ConsumeToken(); |
| |
| SourceLocation LParenLoc = Tok.getLocation(); |
| if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen)) |
| 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); |
| |
| // exception-declaration is equivalent to '...' or a parameter-declaration |
| // without default arguments. |
| Decl *ExceptionDecl = 0; |
| if (Tok.isNot(tok::ellipsis)) { |
| DeclSpec DS; |
| if (ParseCXXTypeSpecifierSeq(DS)) |
| return StmtError(); |
| Declarator ExDecl(DS, Declarator::CXXCatchContext); |
| ParseDeclarator(ExDecl); |
| ExceptionDecl = Actions.ActOnExceptionDeclarator(getCurScope(), ExDecl); |
| } else |
| ConsumeToken(); |
| |
| if (MatchRHSPunctuation(tok::r_paren, LParenLoc).isInvalid()) |
| return StmtError(); |
| |
| if (Tok.isNot(tok::l_brace)) |
| return StmtError(Diag(Tok, diag::err_expected_lbrace)); |
| |
| // FIXME: Possible draft standard bug: attribute-specifier should be allowed? |
| ParsedAttributes attrs; |
| StmtResult Block(ParseCompoundStatement(attrs)); |
| if (Block.isInvalid()) |
| return move(Block); |
| |
| return Actions.ActOnCXXCatchBlock(CatchLoc, ExceptionDecl, Block.take()); |
| } |