| //===--- ParseStmt.cpp - Statement and Block Parser -----------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by Chris Lattner and 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 "clang/Basic/Diagnostic.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Parse/Scope.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 |
| /// [OBC] objc-throw-statement |
| /// [OBC] objc-try-catch-statement |
| /// [OBC] objc-synchronized-statement [TODO] |
| /// [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' ';' |
| /// |
| Parser::StmtResult Parser::ParseStatementOrDeclaration(bool OnlyStatement) { |
| const char *SemiError = 0; |
| Parser::StmtResult Res; |
| |
| // 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::identifier: // C99 6.8.1: labeled-statement |
| // identifier ':' statement |
| // declaration (if !OnlyStatement) |
| // expression[opt] ';' |
| return ParseIdentifierStatement(OnlyStatement); |
| |
| case tok::at: // May be a @try or @throw statement |
| { |
| AtLoc = ConsumeToken(); // consume @ |
| if (Tok.getIdentifierInfo()->getObjCKeywordID() == tok::objc_try) |
| return ParseObjCTryStmt(AtLoc); |
| else if (Tok.getIdentifierInfo()->getObjCKeywordID() == tok::objc_throw) |
| return ParseObjCThrowStmt(AtLoc); |
| ExprResult Res = ParseExpressionWithLeadingAt(AtLoc); |
| if (Res.isInvalid) { |
| // If the expression is invalid, skip ahead to the next semicolon. Not |
| // doing this opens us up to the possibility of infinite loops if |
| // ParseExpression does not consume any tokens. |
| SkipUntil(tok::semi); |
| return true; |
| } |
| // Otherwise, eat the semicolon. |
| ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr); |
| return Actions.ActOnExprStmt(Res.Val); |
| } |
| |
| default: |
| if (!OnlyStatement && isDeclarationSpecifier()) { |
| return Actions.ActOnDeclStmt(ParseDeclaration(Declarator::BlockContext)); |
| } else if (Tok.is(tok::r_brace)) { |
| Diag(Tok, diag::err_expected_statement); |
| return true; |
| } else { |
| // expression[opt] ';' |
| ExprResult Res = ParseExpression(); |
| if (Res.isInvalid) { |
| // If the expression is invalid, skip ahead to the next semicolon. Not |
| // doing this opens us up to the possibility of infinite loops if |
| // ParseExpression does not consume any tokens. |
| SkipUntil(tok::semi); |
| return true; |
| } |
| // Otherwise, eat the semicolon. |
| ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr); |
| return Actions.ActOnExprStmt(Res.Val); |
| } |
| |
| case tok::kw_case: // C99 6.8.1: labeled-statement |
| return ParseCaseStatement(); |
| case tok::kw_default: // C99 6.8.1: labeled-statement |
| return ParseDefaultStatement(); |
| |
| case tok::l_brace: // C99 6.8.2: compound-statement |
| return ParseCompoundStatement(); |
| case tok::semi: // C99 6.8.3p3: expression[opt] ';' |
| return Actions.ActOnNullStmt(ConsumeToken()); |
| |
| case tok::kw_if: // C99 6.8.4.1: if-statement |
| return ParseIfStatement(); |
| case tok::kw_switch: // C99 6.8.4.2: switch-statement |
| return ParseSwitchStatement(); |
| |
| case tok::kw_while: // C99 6.8.5.1: while-statement |
| return ParseWhileStatement(); |
| case tok::kw_do: // C99 6.8.5.2: do-statement |
| Res = ParseDoStatement(); |
| SemiError = "do/while loop"; |
| break; |
| case tok::kw_for: // C99 6.8.5.3: for-statement |
| return ParseForStatement(); |
| |
| case tok::kw_goto: // C99 6.8.6.1: goto-statement |
| Res = ParseGotoStatement(); |
| SemiError = "goto statement"; |
| break; |
| case tok::kw_continue: // C99 6.8.6.2: continue-statement |
| Res = ParseContinueStatement(); |
| SemiError = "continue statement"; |
| break; |
| case tok::kw_break: // C99 6.8.6.3: break-statement |
| Res = ParseBreakStatement(); |
| SemiError = "break statement"; |
| break; |
| case tok::kw_return: // C99 6.8.6.4: return-statement |
| Res = ParseReturnStatement(); |
| SemiError = "return statement"; |
| break; |
| |
| case tok::kw_asm: |
| Res = ParseAsmStatement(); |
| SemiError = "asm statement"; |
| break; |
| } |
| |
| // If we reached this code, the statement must end in a semicolon. |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else { |
| Diag(Tok, diag::err_expected_semi_after, SemiError); |
| SkipUntil(tok::semi); |
| } |
| return Res; |
| } |
| |
| /// ParseIdentifierStatement - Because we don't have two-token lookahead, we |
| /// have a bit of a quandry here. Reading the identifier is necessary to see if |
| /// there is a ':' after it. If there is, this is a label, regardless of what |
| /// else the identifier can mean. If not, this is either part of a declaration |
| /// (if the identifier is a type-name) or part of an expression. |
| /// |
| /// labeled-statement: |
| /// identifier ':' statement |
| /// [GNU] identifier ':' attributes[opt] statement |
| /// declaration (if !OnlyStatement) |
| /// expression[opt] ';' |
| /// |
| Parser::StmtResult Parser::ParseIdentifierStatement(bool OnlyStatement) { |
| assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() && |
| "Not an identifier!"); |
| |
| Token IdentTok = Tok; // Save the whole token. |
| ConsumeToken(); // eat the identifier. |
| |
| // identifier ':' statement |
| if (Tok.is(tok::colon)) { |
| SourceLocation ColonLoc = ConsumeToken(); |
| |
| // Read label attributes, if present. |
| DeclTy *AttrList = 0; |
| if (Tok.is(tok::kw___attribute)) |
| // TODO: save these somewhere. |
| AttrList = ParseAttributes(); |
| |
| 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.Val); |
| } |
| |
| // Check to see if this is a declaration. |
| void *TypeRep; |
| if (!OnlyStatement && |
| (TypeRep = Actions.isTypeName(*IdentTok.getIdentifierInfo(), CurScope))) { |
| // Handle this. Warn/disable if in middle of block and !C99. |
| DeclSpec DS; |
| |
| // Add the typedef name to the start of the decl-specs. |
| const char *PrevSpec = 0; |
| int isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typedef, |
| IdentTok.getLocation(), PrevSpec, |
| TypeRep); |
| assert(!isInvalid && "First declspec can't be invalid!"); |
| if (Tok.is(tok::less)) { |
| llvm::SmallVector<IdentifierInfo *, 8> ProtocolRefs; |
| ParseObjCProtocolReferences(ProtocolRefs); |
| llvm::SmallVector<DeclTy *, 8> *ProtocolDecl = |
| new llvm::SmallVector<DeclTy *, 8>; |
| DS.setProtocolQualifiers(ProtocolDecl); |
| Actions.FindProtocolDeclaration(IdentTok.getLocation(), |
| &ProtocolRefs[0], ProtocolRefs.size(), |
| *ProtocolDecl); |
| } |
| |
| // ParseDeclarationSpecifiers will continue from there. |
| ParseDeclarationSpecifiers(DS); |
| |
| // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };" |
| // declaration-specifiers init-declarator-list[opt] ';' |
| if (Tok.is(tok::semi)) { |
| // TODO: emit error on 'int;' or 'const enum foo;'. |
| // if (!DS.isMissingDeclaratorOk()) Diag(...); |
| |
| ConsumeToken(); |
| // FIXME: Return this as a type decl. |
| return 0; |
| } |
| |
| // Parse all the declarators. |
| Declarator DeclaratorInfo(DS, Declarator::BlockContext); |
| ParseDeclarator(DeclaratorInfo); |
| |
| DeclTy *Decl = ParseInitDeclaratorListAfterFirstDeclarator(DeclaratorInfo); |
| return Decl ? Actions.ActOnDeclStmt(Decl) : 0; |
| } |
| |
| // Otherwise, this is an expression. Seed it with II and parse it. |
| ExprResult Res = ParseExpressionWithLeadingIdentifier(IdentTok); |
| if (Res.isInvalid) { |
| SkipUntil(tok::semi); |
| return true; |
| } else if (Tok.isNot(tok::semi)) { |
| Diag(Tok, diag::err_expected_semi_after, "expression"); |
| SkipUntil(tok::semi); |
| return true; |
| } else { |
| ConsumeToken(); |
| // Convert expr to a stmt. |
| return Actions.ActOnExprStmt(Res.Val); |
| } |
| } |
| |
| /// ParseCaseStatement |
| /// labeled-statement: |
| /// 'case' constant-expression ':' statement |
| /// [GNU] 'case' constant-expression '...' constant-expression ':' statement |
| /// |
| /// Note that this does not parse the 'statement' at the end. |
| /// |
| Parser::StmtResult Parser::ParseCaseStatement() { |
| assert(Tok.is(tok::kw_case) && "Not a case stmt!"); |
| SourceLocation CaseLoc = ConsumeToken(); // eat the 'case'. |
| |
| ExprResult LHS = ParseConstantExpression(); |
| if (LHS.isInvalid) { |
| SkipUntil(tok::colon); |
| return true; |
| } |
| |
| // GNU case range extension. |
| SourceLocation DotDotDotLoc; |
| ExprTy *RHSVal = 0; |
| if (Tok.is(tok::ellipsis)) { |
| Diag(Tok, diag::ext_gnu_case_range); |
| DotDotDotLoc = ConsumeToken(); |
| |
| ExprResult RHS = ParseConstantExpression(); |
| if (RHS.isInvalid) { |
| SkipUntil(tok::colon); |
| return true; |
| } |
| RHSVal = RHS.Val; |
| } |
| |
| if (Tok.isNot(tok::colon)) { |
| Diag(Tok, diag::err_expected_colon_after, "'case'"); |
| SkipUntil(tok::colon); |
| return true; |
| } |
| |
| SourceLocation ColonLoc = ConsumeToken(); |
| |
| // Diagnose the common error "switch (X) { case 4: }", which is not valid. |
| if (Tok.is(tok::r_brace)) { |
| Diag(Tok, diag::err_label_end_of_compound_statement); |
| return true; |
| } |
| |
| StmtResult SubStmt = ParseStatement(); |
| |
| // Broken substmt shouldn't prevent the case from being added to the AST. |
| if (SubStmt.isInvalid) |
| SubStmt = Actions.ActOnNullStmt(ColonLoc); |
| |
| return Actions.ActOnCaseStmt(CaseLoc, LHS.Val, DotDotDotLoc, RHSVal, ColonLoc, |
| SubStmt.Val); |
| } |
| |
| /// ParseDefaultStatement |
| /// labeled-statement: |
| /// 'default' ':' statement |
| /// Note that this does not parse the 'statement' at the end. |
| /// |
| Parser::StmtResult Parser::ParseDefaultStatement() { |
| assert(Tok.is(tok::kw_default) && "Not a default stmt!"); |
| SourceLocation DefaultLoc = ConsumeToken(); // eat the 'default'. |
| |
| if (Tok.isNot(tok::colon)) { |
| Diag(Tok, diag::err_expected_colon_after, "'default'"); |
| SkipUntil(tok::colon); |
| return true; |
| } |
| |
| SourceLocation 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 true; |
| } |
| |
| StmtResult SubStmt = ParseStatement(); |
| if (SubStmt.isInvalid) |
| return true; |
| |
| return Actions.ActOnDefaultStmt(DefaultLoc, ColonLoc, SubStmt.Val, CurScope); |
| } |
| |
| |
| /// 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 |
| /// |
| Parser::StmtResult Parser::ParseCompoundStatement(bool isStmtExpr) { |
| 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. |
| EnterScope(Scope::DeclScope); |
| |
| // Parse the statements in the body. |
| StmtResult Body = ParseCompoundStatementBody(isStmtExpr); |
| |
| ExitScope(); |
| return Body; |
| } |
| |
| |
| /// 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. |
| Parser::StmtResult Parser::ParseCompoundStatementBody(bool isStmtExpr) { |
| 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. |
| |
| llvm::SmallVector<StmtTy*, 32> Stmts; |
| while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { |
| StmtResult R; |
| if (Tok.isNot(tok::kw___extension__)) { |
| R = ParseStatementOrDeclaration(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. |
| SourceLocation ExtLoc = ConsumeToken(); |
| while (Tok.is(tok::kw___extension__)) |
| ConsumeToken(); |
| |
| // If this is the start of a declaration, parse it as such. |
| if (isDeclarationSpecifier()) { |
| // FIXME: Save the __extension__ on the decl as a node somehow. |
| // FIXME: disable extwarns. |
| R = Actions.ActOnDeclStmt(ParseDeclaration(Declarator::BlockContext)); |
| } else { |
| // Otherwise this was a unary __extension__ marker. Parse the |
| // subexpression and add the __extension__ unary op. |
| // FIXME: disable extwarns. |
| ExprResult Res = ParseCastExpression(false); |
| if (Res.isInvalid) { |
| SkipUntil(tok::semi); |
| continue; |
| } |
| |
| // Add the __extension__ node to the AST. |
| Res = Actions.ActOnUnaryOp(ExtLoc, tok::kw___extension__, Res.Val); |
| if (Res.isInvalid) |
| continue; |
| |
| // Eat the semicolon at the end of stmt and convert the expr into a stmt. |
| ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr); |
| R = Actions.ActOnExprStmt(Res.Val); |
| } |
| } |
| |
| if (!R.isInvalid && R.Val) |
| Stmts.push_back(R.Val); |
| } |
| |
| // 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); |
| return 0; |
| } |
| |
| SourceLocation RBraceLoc = ConsumeBrace(); |
| return Actions.ActOnCompoundStmt(LBraceLoc, RBraceLoc, |
| &Stmts[0], Stmts.size(), isStmtExpr); |
| } |
| |
| /// ParseIfStatement |
| /// if-statement: [C99 6.8.4.1] |
| /// 'if' '(' expression ')' statement |
| /// 'if' '(' expression ')' statement 'else' statement |
| /// |
| Parser::StmtResult Parser::ParseIfStatement() { |
| 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 true; |
| } |
| |
| // C99 6.8.4p3 - In C99, the if statement is a block. This is not |
| // the case for C90. |
| if (getLang().C99) |
| EnterScope(Scope::DeclScope); |
| |
| // Parse the condition. |
| ExprResult CondExp = ParseSimpleParenExpression(); |
| if (CondExp.isInvalid) { |
| SkipUntil(tok::semi); |
| if (getLang().C99) |
| ExitScope(); |
| return true; |
| } |
| |
| // 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. |
| bool NeedsInnerScope = getLang().C99 && Tok.isNot(tok::l_brace); |
| if (NeedsInnerScope) EnterScope(Scope::DeclScope); |
| |
| // Read the if condition. |
| StmtResult CondStmt = ParseStatement(); |
| |
| // Broken substmt shouldn't prevent the label from being added to the AST. |
| if (CondStmt.isInvalid) |
| CondStmt = Actions.ActOnNullStmt(Tok.getLocation()); |
| |
| // Pop the 'if' scope if needed. |
| if (NeedsInnerScope) ExitScope(); |
| |
| // If it has an else, parse it. |
| SourceLocation ElseLoc; |
| StmtResult ElseStmt(false); |
| if (Tok.is(tok::kw_else)) { |
| ElseLoc = ConsumeToken(); |
| |
| // 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. |
| NeedsInnerScope = getLang().C99 && Tok.isNot(tok::l_brace); |
| if (NeedsInnerScope) EnterScope(Scope::DeclScope); |
| |
| ElseStmt = ParseStatement(); |
| |
| // Pop the 'else' scope if needed. |
| if (NeedsInnerScope) ExitScope(); |
| |
| if (ElseStmt.isInvalid) |
| ElseStmt = Actions.ActOnNullStmt(ElseLoc); |
| } |
| |
| if (getLang().C99) |
| ExitScope(); |
| |
| return Actions.ActOnIfStmt(IfLoc, CondExp.Val, CondStmt.Val, |
| ElseLoc, ElseStmt.Val); |
| } |
| |
| /// ParseSwitchStatement |
| /// switch-statement: |
| /// 'switch' '(' expression ')' statement |
| Parser::StmtResult Parser::ParseSwitchStatement() { |
| 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 true; |
| } |
| |
| // C99 6.8.4p3 - In C99, the switch statement is a block. This is |
| // not the case for C90. Start the switch scope. |
| if (getLang().C99) |
| EnterScope(Scope::BreakScope|Scope::DeclScope); |
| else |
| EnterScope(Scope::BreakScope); |
| |
| // Parse the condition. |
| ExprResult Cond = ParseSimpleParenExpression(); |
| |
| if (Cond.isInvalid) { |
| ExitScope(); |
| return true; |
| } |
| |
| StmtResult Switch = Actions.ActOnStartOfSwitchStmt(Cond.Val); |
| |
| // 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. |
| bool NeedsInnerScope = getLang().C99 && Tok.isNot(tok::l_brace); |
| if (NeedsInnerScope) EnterScope(Scope::DeclScope); |
| |
| // Read the body statement. |
| StmtResult Body = ParseStatement(); |
| |
| // Pop the body scope if needed. |
| if (NeedsInnerScope) ExitScope(); |
| |
| if (Body.isInvalid) { |
| Body = Actions.ActOnNullStmt(Tok.getLocation()); |
| // FIXME: Remove the case statement list from the Switch statement. |
| } |
| |
| ExitScope(); |
| |
| return Actions.ActOnFinishSwitchStmt(SwitchLoc, Switch.Val, Body.Val); |
| } |
| |
| /// ParseWhileStatement |
| /// while-statement: [C99 6.8.5.1] |
| /// 'while' '(' expression ')' statement |
| Parser::StmtResult Parser::ParseWhileStatement() { |
| 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 true; |
| } |
| |
| // C99 6.8.5p5 - In C99, the while statement is a block. This is not |
| // the case for C90. Start the loop scope. |
| if (getLang().C99) |
| EnterScope(Scope::BreakScope | Scope::ContinueScope | Scope::DeclScope); |
| else |
| EnterScope(Scope::BreakScope | Scope::ContinueScope); |
| |
| // Parse the condition. |
| ExprResult Cond = ParseSimpleParenExpression(); |
| |
| // 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. |
| bool NeedsInnerScope = getLang().C99 && Tok.isNot(tok::l_brace); |
| if (NeedsInnerScope) EnterScope(Scope::DeclScope); |
| |
| // Read the body statement. |
| StmtResult Body = ParseStatement(); |
| |
| // Pop the body scope if needed. |
| if (NeedsInnerScope) ExitScope(); |
| |
| ExitScope(); |
| |
| if (Cond.isInvalid || Body.isInvalid) return true; |
| |
| return Actions.ActOnWhileStmt(WhileLoc, Cond.Val, Body.Val); |
| } |
| |
| /// ParseDoStatement |
| /// do-statement: [C99 6.8.5.2] |
| /// 'do' statement 'while' '(' expression ')' ';' |
| /// Note: this lets the caller parse the end ';'. |
| Parser::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. |
| if (getLang().C99) |
| EnterScope(Scope::BreakScope | Scope::ContinueScope | Scope::DeclScope); |
| else |
| EnterScope(Scope::BreakScope | Scope::ContinueScope); |
| |
| // 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. |
| bool NeedsInnerScope = getLang().C99 && Tok.isNot(tok::l_brace); |
| if (NeedsInnerScope) EnterScope(Scope::DeclScope); |
| |
| // Read the body statement. |
| StmtResult Body = ParseStatement(); |
| |
| // Pop the body scope if needed. |
| if (NeedsInnerScope) ExitScope(); |
| |
| if (Tok.isNot(tok::kw_while)) { |
| ExitScope(); |
| Diag(Tok, diag::err_expected_while); |
| Diag(DoLoc, diag::err_matching, "do"); |
| SkipUntil(tok::semi); |
| return true; |
| } |
| SourceLocation WhileLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| ExitScope(); |
| Diag(Tok, diag::err_expected_lparen_after, "do/while"); |
| SkipUntil(tok::semi); |
| return true; |
| } |
| |
| // Parse the condition. |
| ExprResult Cond = ParseSimpleParenExpression(); |
| |
| ExitScope(); |
| |
| if (Cond.isInvalid || Body.isInvalid) return true; |
| |
| return Actions.ActOnDoStmt(DoLoc, Body.Val, WhileLoc, Cond.Val); |
| } |
| |
| /// ParseForStatement |
| /// for-statement: [C99 6.8.5.3] |
| /// 'for' '(' expr[opt] ';' expr[opt] ';' expr[opt] ')' statement |
| /// 'for' '(' declaration expr[opt] ';' expr[opt] ')' statement |
| Parser::StmtResult Parser::ParseForStatement() { |
| 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 true; |
| } |
| |
| // C99 6.8.5p5 - In C99, the for statement is a block. This is not |
| // the case for C90. Start the loop scope. |
| if (getLang().C99) |
| EnterScope(Scope::BreakScope | Scope::ContinueScope | Scope::DeclScope); |
| else |
| EnterScope(Scope::BreakScope | Scope::ContinueScope); |
| |
| SourceLocation LParenLoc = ConsumeParen(); |
| ExprResult Value; |
| |
| StmtTy *FirstPart = 0; |
| ExprTy *SecondPart = 0; |
| StmtTy *ThirdPart = 0; |
| |
| // Parse the first part of the for specifier. |
| if (Tok.is(tok::semi)) { // for (; |
| // no first part, eat the ';'. |
| ConsumeToken(); |
| } else if (isDeclarationSpecifier()) { // for (int X = 4; |
| // Parse declaration, which eats the ';'. |
| if (!getLang().C99) // Use of C99-style for loops in C90 mode? |
| Diag(Tok, diag::ext_c99_variable_decl_in_for_loop); |
| DeclTy *aBlockVarDecl = ParseDeclaration(Declarator::ForContext); |
| StmtResult stmtResult = Actions.ActOnDeclStmt(aBlockVarDecl); |
| FirstPart = stmtResult.isInvalid ? 0 : stmtResult.Val; |
| } else { |
| Value = ParseExpression(); |
| |
| // Turn the expression into a stmt. |
| if (!Value.isInvalid) { |
| StmtResult R = Actions.ActOnExprStmt(Value.Val); |
| if (!R.isInvalid) |
| FirstPart = R.Val; |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else { |
| if (!Value.isInvalid) Diag(Tok, diag::err_expected_semi_for); |
| SkipUntil(tok::semi); |
| } |
| } |
| |
| // Parse the second part of the for specifier. |
| if (Tok.is(tok::semi)) { // for (...;; |
| // no second part. |
| Value = ExprResult(); |
| } else { |
| Value = ParseExpression(); |
| if (!Value.isInvalid) |
| SecondPart = Value.Val; |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else { |
| if (!Value.isInvalid) Diag(Tok, diag::err_expected_semi_for); |
| SkipUntil(tok::semi); |
| } |
| |
| // Parse the third part of the for specifier. |
| if (Tok.is(tok::r_paren)) { // for (...;...;) |
| // no third part. |
| Value = ExprResult(); |
| } else { |
| Value = ParseExpression(); |
| if (!Value.isInvalid) { |
| // Turn the expression into a stmt. |
| StmtResult R = Actions.ActOnExprStmt(Value.Val); |
| if (!R.isInvalid) |
| ThirdPart = R.Val; |
| } |
| } |
| |
| // 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. |
| bool NeedsInnerScope = getLang().C99 && Tok.isNot(tok::l_brace); |
| if (NeedsInnerScope) EnterScope(Scope::DeclScope); |
| |
| // Read the body statement. |
| StmtResult Body = ParseStatement(); |
| |
| // Pop the body scope if needed. |
| if (NeedsInnerScope) ExitScope(); |
| |
| // Leave the for-scope. |
| ExitScope(); |
| |
| if (Body.isInvalid) |
| return Body; |
| |
| return Actions.ActOnForStmt(ForLoc, LParenLoc, FirstPart, SecondPart, |
| ThirdPart, RParenLoc, Body.Val); |
| } |
| |
| /// ParseGotoStatement |
| /// jump-statement: |
| /// 'goto' identifier ';' |
| /// [GNU] 'goto' '*' expression ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| Parser::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)) { |
| Res = Actions.ActOnGotoStmt(GotoLoc, Tok.getLocation(), |
| Tok.getIdentifierInfo()); |
| ConsumeToken(); |
| } else if (Tok.is(tok::star) && !getLang().NoExtensions) { |
| // 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 true; |
| } |
| Res = Actions.ActOnIndirectGotoStmt(GotoLoc, StarLoc, R.Val); |
| } else { |
| Diag(Tok, diag::err_expected_ident); |
| return true; |
| } |
| |
| return Res; |
| } |
| |
| /// ParseContinueStatement |
| /// jump-statement: |
| /// 'continue' ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| Parser::StmtResult Parser::ParseContinueStatement() { |
| SourceLocation ContinueLoc = ConsumeToken(); // eat the 'continue'. |
| return Actions.ActOnContinueStmt(ContinueLoc, CurScope); |
| } |
| |
| /// ParseBreakStatement |
| /// jump-statement: |
| /// 'break' ';' |
| /// |
| /// Note: this lets the caller parse the end ';'. |
| /// |
| Parser::StmtResult Parser::ParseBreakStatement() { |
| SourceLocation BreakLoc = ConsumeToken(); // eat the 'break'. |
| return Actions.ActOnBreakStmt(BreakLoc, CurScope); |
| } |
| |
| /// ParseReturnStatement |
| /// jump-statement: |
| /// 'return' expression[opt] ';' |
| Parser::StmtResult Parser::ParseReturnStatement() { |
| assert(Tok.is(tok::kw_return) && "Not a return stmt!"); |
| SourceLocation ReturnLoc = ConsumeToken(); // eat the 'return'. |
| |
| ExprResult R(0); |
| if (Tok.isNot(tok::semi)) { |
| R = ParseExpression(); |
| if (R.isInvalid) { // Skip to the semicolon, but don't consume it. |
| SkipUntil(tok::semi, false, true); |
| return true; |
| } |
| } |
| return Actions.ActOnReturnStmt(ReturnLoc, R.Val); |
| } |
| |
| /// ParseAsmStatement - Parse a GNU extended asm statement. |
| /// [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 |
| /// |
| Parser::StmtResult Parser::ParseAsmStatement() { |
| assert(Tok.is(tok::kw_asm) && "Not an asm stmt"); |
| SourceLocation AsmLoc = ConsumeToken(); |
| |
| DeclSpec DS; |
| SourceLocation Loc = Tok.getLocation(); |
| ParseTypeQualifierListOpt(DS); |
| |
| // 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.TypeQualifiers & DeclSpec::TQ_volatile; |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after, "asm"); |
| SkipUntil(tok::r_paren); |
| return true; |
| } |
| Loc = ConsumeParen(); |
| |
| ParseAsmStringLiteral(); |
| |
| // Parse Outputs, if present. |
| ParseAsmOperandsOpt(); |
| |
| // Parse Inputs, if present. |
| ParseAsmOperandsOpt(); |
| |
| // Parse the clobbers, if present. |
| if (Tok.is(tok::colon)) { |
| ConsumeToken(); |
| |
| if (isTokenStringLiteral()) { |
| // Parse the asm-string list for clobbers. |
| while (1) { |
| ParseAsmStringLiteral(); |
| |
| if (Tok.isNot(tok::comma)) break; |
| ConsumeToken(); |
| } |
| } |
| } |
| |
| SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, Loc); |
| |
| // FIXME: Pass all the details down to the action. |
| return Actions.ActOnAsmStmt(AsmLoc, RParenLoc); |
| } |
| |
| /// ParseAsmOperands - Parse the asm-operands production as used by |
| /// asm-statement. We also parse a leading ':' token. If the leading colon is |
| /// not present, we do not parse anything. |
| /// |
| /// [GNU] asm-operands: |
| /// asm-operand |
| /// asm-operands ',' asm-operand |
| /// |
| /// [GNU] asm-operand: |
| /// asm-string-literal '(' expression ')' |
| /// '[' identifier ']' asm-string-literal '(' expression ')' |
| /// |
| void Parser::ParseAsmOperandsOpt() { |
| // Only do anything if this operand is present. |
| if (Tok.isNot(tok::colon)) return; |
| ConsumeToken(); |
| |
| // 'asm-operands' isn't present? |
| if (!isTokenStringLiteral() && Tok.isNot(tok::l_square)) |
| return; |
| |
| 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; |
| } |
| |
| // Eat the identifier, FIXME: capture it. |
| ConsumeToken(); |
| |
| MatchRHSPunctuation(tok::r_square, Loc); |
| } |
| |
| ParseAsmStringLiteral(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after, "asm operand"); |
| SkipUntil(tok::r_paren); |
| return; |
| } |
| |
| // Read the parenthesized expression. |
| ExprResult Res = ParseSimpleParenExpression(); |
| if (Res.isInvalid) { |
| SkipUntil(tok::r_paren); |
| return; |
| } |
| |
| // Eat the comma and continue parsing if it exists. |
| if (Tok.isNot(tok::comma)) return; |
| ConsumeToken(); |
| } |
| } |