| //===--- SemaStmt.cpp - Semantic Analysis for Statements ------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements semantic analysis for statements. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Sema.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/AST/Stmt.h" |
| #include "clang/Parse/Scope.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/LangOptions.h" |
| #include "llvm/ADT/SmallString.h" |
| using namespace clang; |
| |
| Sema::StmtResult Sema::ActOnExprStmt(ExprTy *expr) { |
| Expr *E = static_cast<Expr*>(expr); |
| assert(E && "ActOnExprStmt(): missing expression"); |
| return E; |
| } |
| |
| |
| Sema::StmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { |
| return new NullStmt(SemiLoc); |
| } |
| |
| Sema::StmtResult Sema::ActOnDeclStmt(DeclTy *decl) { |
| if (decl) { |
| ScopedDecl *SD = dyn_cast<ScopedDecl>(static_cast<Decl *>(decl)); |
| assert(SD && "Sema::ActOnDeclStmt(): expected ScopedDecl"); |
| return new DeclStmt(SD); |
| } else |
| return true; // error |
| } |
| |
| Action::StmtResult |
| Sema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, |
| StmtTy **elts, unsigned NumElts, bool isStmtExpr) { |
| Stmt **Elts = reinterpret_cast<Stmt**>(elts); |
| // If we're in C89 mode, check that we don't have any decls after stmts. If |
| // so, emit an extension diagnostic. |
| if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { |
| // Note that __extension__ can be around a decl. |
| unsigned i = 0; |
| // Skip over all declarations. |
| for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) |
| /*empty*/; |
| |
| // We found the end of the list or a statement. Scan for another declstmt. |
| for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) |
| /*empty*/; |
| |
| if (i != NumElts) { |
| ScopedDecl *D = cast<DeclStmt>(Elts[i])->getDecl(); |
| Diag(D->getLocation(), diag::ext_mixed_decls_code); |
| } |
| } |
| // Warn about unused expressions in statements. |
| for (unsigned i = 0; i != NumElts; ++i) { |
| Expr *E = dyn_cast<Expr>(Elts[i]); |
| if (!E) continue; |
| |
| // Warn about expressions with unused results. |
| if (E->hasLocalSideEffect() || E->getType()->isVoidType()) |
| continue; |
| |
| // The last expr in a stmt expr really is used. |
| if (isStmtExpr && i == NumElts-1) |
| continue; |
| |
| /// DiagnoseDeadExpr - This expression is side-effect free and evaluated in |
| /// a context where the result is unused. Emit a diagnostic to warn about |
| /// this. |
| if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) |
| Diag(BO->getOperatorLoc(), diag::warn_unused_expr, |
| BO->getLHS()->getSourceRange(), BO->getRHS()->getSourceRange()); |
| else if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) |
| Diag(UO->getOperatorLoc(), diag::warn_unused_expr, |
| UO->getSubExpr()->getSourceRange()); |
| else |
| Diag(E->getExprLoc(), diag::warn_unused_expr, E->getSourceRange()); |
| } |
| |
| return new CompoundStmt(Elts, NumElts, L, R); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnCaseStmt(SourceLocation CaseLoc, ExprTy *lhsval, |
| SourceLocation DotDotDotLoc, ExprTy *rhsval, |
| SourceLocation ColonLoc, StmtTy *subStmt) { |
| Stmt *SubStmt = static_cast<Stmt*>(subStmt); |
| Expr *LHSVal = ((Expr *)lhsval), *RHSVal = ((Expr *)rhsval); |
| assert((LHSVal != 0) && "missing expression in case statement"); |
| |
| SourceLocation ExpLoc; |
| // C99 6.8.4.2p3: The expression shall be an integer constant. |
| if (!LHSVal->isIntegerConstantExpr(Context, &ExpLoc)) { |
| Diag(ExpLoc, diag::err_case_label_not_integer_constant_expr, |
| LHSVal->getSourceRange()); |
| return SubStmt; |
| } |
| |
| // GCC extension: The expression shall be an integer constant. |
| if (RHSVal && !RHSVal->isIntegerConstantExpr(Context, &ExpLoc)) { |
| Diag(ExpLoc, diag::err_case_label_not_integer_constant_expr, |
| RHSVal->getSourceRange()); |
| RHSVal = 0; // Recover by just forgetting about it. |
| } |
| |
| if (SwitchStack.empty()) { |
| Diag(CaseLoc, diag::err_case_not_in_switch); |
| return SubStmt; |
| } |
| |
| CaseStmt *CS = new CaseStmt(LHSVal, RHSVal, SubStmt, CaseLoc); |
| SwitchStack.back()->addSwitchCase(CS); |
| return CS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, |
| StmtTy *subStmt, Scope *CurScope) { |
| Stmt *SubStmt = static_cast<Stmt*>(subStmt); |
| |
| if (SwitchStack.empty()) { |
| Diag(DefaultLoc, diag::err_default_not_in_switch); |
| return SubStmt; |
| } |
| |
| DefaultStmt *DS = new DefaultStmt(DefaultLoc, SubStmt); |
| SwitchStack.back()->addSwitchCase(DS); |
| |
| return DS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, |
| SourceLocation ColonLoc, StmtTy *subStmt) { |
| Stmt *SubStmt = static_cast<Stmt*>(subStmt); |
| // Look up the record for this label identifier. |
| LabelStmt *&LabelDecl = LabelMap[II]; |
| |
| // If not forward referenced or defined already, just create a new LabelStmt. |
| if (LabelDecl == 0) |
| return LabelDecl = new LabelStmt(IdentLoc, II, SubStmt); |
| |
| assert(LabelDecl->getID() == II && "Label mismatch!"); |
| |
| // Otherwise, this label was either forward reference or multiply defined. If |
| // multiply defined, reject it now. |
| if (LabelDecl->getSubStmt()) { |
| Diag(IdentLoc, diag::err_redefinition_of_label, LabelDecl->getName()); |
| Diag(LabelDecl->getIdentLoc(), diag::err_previous_definition); |
| return SubStmt; |
| } |
| |
| // Otherwise, this label was forward declared, and we just found its real |
| // definition. Fill in the forward definition and return it. |
| LabelDecl->setIdentLoc(IdentLoc); |
| LabelDecl->setSubStmt(SubStmt); |
| return LabelDecl; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnIfStmt(SourceLocation IfLoc, ExprTy *CondVal, |
| StmtTy *ThenVal, SourceLocation ElseLoc, |
| StmtTy *ElseVal) { |
| Expr *condExpr = (Expr *)CondVal; |
| Stmt *thenStmt = (Stmt *)ThenVal; |
| |
| assert(condExpr && "ActOnIfStmt(): missing expression"); |
| |
| DefaultFunctionArrayConversion(condExpr); |
| QualType condType = condExpr->getType(); |
| |
| if (!condType->isScalarType()) // C99 6.8.4.1p1 |
| return Diag(IfLoc, diag::err_typecheck_statement_requires_scalar, |
| condType.getAsString(), condExpr->getSourceRange()); |
| |
| // Warn if the if block has a null body without an else value. |
| // this helps prevent bugs due to typos, such as |
| // if (condition); |
| // do_stuff(); |
| if (!ElseVal) { |
| if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) |
| Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); |
| } |
| |
| return new IfStmt(IfLoc, condExpr, thenStmt, (Stmt*)ElseVal); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnStartOfSwitchStmt(ExprTy *cond) { |
| Expr *Cond = static_cast<Expr*>(cond); |
| |
| // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. |
| UsualUnaryConversions(Cond); |
| |
| SwitchStmt *SS = new SwitchStmt(Cond); |
| SwitchStack.push_back(SS); |
| return SS; |
| } |
| |
| /// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have |
| /// the specified width and sign. If an overflow occurs, detect it and emit |
| /// the specified diagnostic. |
| void Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, |
| unsigned NewWidth, bool NewSign, |
| SourceLocation Loc, |
| unsigned DiagID) { |
| // Perform a conversion to the promoted condition type if needed. |
| if (NewWidth > Val.getBitWidth()) { |
| // If this is an extension, just do it. |
| llvm::APSInt OldVal(Val); |
| Val.extend(NewWidth); |
| |
| // If the input was signed and negative and the output is unsigned, |
| // warn. |
| if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) |
| Diag(Loc, DiagID, OldVal.toString(), Val.toString()); |
| |
| Val.setIsSigned(NewSign); |
| } else if (NewWidth < Val.getBitWidth()) { |
| // If this is a truncation, check for overflow. |
| llvm::APSInt ConvVal(Val); |
| ConvVal.trunc(NewWidth); |
| ConvVal.setIsSigned(NewSign); |
| ConvVal.extend(Val.getBitWidth()); |
| ConvVal.setIsSigned(Val.isSigned()); |
| if (ConvVal != Val) |
| Diag(Loc, DiagID, Val.toString(), ConvVal.toString()); |
| |
| // Regardless of whether a diagnostic was emitted, really do the |
| // truncation. |
| Val.trunc(NewWidth); |
| Val.setIsSigned(NewSign); |
| } else if (NewSign != Val.isSigned()) { |
| // Convert the sign to match the sign of the condition. This can cause |
| // overflow as well: unsigned(INTMIN) |
| llvm::APSInt OldVal(Val); |
| Val.setIsSigned(NewSign); |
| |
| if (Val.isNegative()) // Sign bit changes meaning. |
| Diag(Loc, DiagID, OldVal.toString(), Val.toString()); |
| } |
| } |
| |
| namespace { |
| struct CaseCompareFunctor { |
| bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| const llvm::APSInt &RHS) { |
| return LHS.first < RHS; |
| } |
| bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| return LHS.first < RHS.first; |
| } |
| bool operator()(const llvm::APSInt &LHS, |
| const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| return LHS < RHS.first; |
| } |
| }; |
| } |
| |
| /// CmpCaseVals - Comparison predicate for sorting case values. |
| /// |
| static bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, |
| const std::pair<llvm::APSInt, CaseStmt*>& rhs) { |
| if (lhs.first < rhs.first) |
| return true; |
| |
| if (lhs.first == rhs.first && |
| lhs.second->getCaseLoc().getRawEncoding() |
| < rhs.second->getCaseLoc().getRawEncoding()) |
| return true; |
| return false; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtTy *Switch, |
| ExprTy *Body) { |
| Stmt *BodyStmt = (Stmt*)Body; |
| |
| SwitchStmt *SS = SwitchStack.back(); |
| assert(SS == (SwitchStmt*)Switch && "switch stack missing push/pop!"); |
| |
| SS->setBody(BodyStmt, SwitchLoc); |
| SwitchStack.pop_back(); |
| |
| Expr *CondExpr = SS->getCond(); |
| QualType CondType = CondExpr->getType(); |
| |
| if (!CondType->isIntegerType()) { // C99 6.8.4.2p1 |
| Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer, |
| CondType.getAsString(), CondExpr->getSourceRange()); |
| return true; |
| } |
| |
| // Get the bitwidth of the switched-on value before promotions. We must |
| // convert the integer case values to this width before comparison. |
| unsigned CondWidth = static_cast<unsigned>(Context.getTypeSize(CondType)); |
| bool CondIsSigned = CondType->isSignedIntegerType(); |
| |
| // Accumulate all of the case values in a vector so that we can sort them |
| // and detect duplicates. This vector contains the APInt for the case after |
| // it has been converted to the condition type. |
| typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; |
| CaseValsTy CaseVals; |
| |
| // Keep track of any GNU case ranges we see. The APSInt is the low value. |
| std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; |
| |
| DefaultStmt *TheDefaultStmt = 0; |
| |
| bool CaseListIsErroneous = false; |
| |
| for (SwitchCase *SC = SS->getSwitchCaseList(); SC; |
| SC = SC->getNextSwitchCase()) { |
| |
| if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { |
| if (TheDefaultStmt) { |
| Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); |
| Diag(TheDefaultStmt->getDefaultLoc(), diag::err_first_label); |
| |
| // FIXME: Remove the default statement from the switch block so that |
| // we'll return a valid AST. This requires recursing down the |
| // AST and finding it, not something we are set up to do right now. For |
| // now, just lop the entire switch stmt out of the AST. |
| CaseListIsErroneous = true; |
| } |
| TheDefaultStmt = DS; |
| |
| } else { |
| CaseStmt *CS = cast<CaseStmt>(SC); |
| |
| // We already verified that the expression has a i-c-e value (C99 |
| // 6.8.4.2p3) - get that value now. |
| llvm::APSInt LoVal(32); |
| Expr *Lo = CS->getLHS(); |
| Lo->isIntegerConstantExpr(LoVal, Context); |
| |
| // Convert the value to the same width/sign as the condition. |
| ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, |
| CS->getLHS()->getLocStart(), |
| diag::warn_case_value_overflow); |
| |
| // If the LHS is not the same type as the condition, insert an implicit |
| // cast. |
| ImpCastExprToType(Lo, CondType); |
| CS->setLHS(Lo); |
| |
| // If this is a case range, remember it in CaseRanges, otherwise CaseVals. |
| if (CS->getRHS()) |
| CaseRanges.push_back(std::make_pair(LoVal, CS)); |
| else |
| CaseVals.push_back(std::make_pair(LoVal, CS)); |
| } |
| } |
| |
| // Sort all the scalar case values so we can easily detect duplicates. |
| std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); |
| |
| if (!CaseVals.empty()) { |
| for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { |
| if (CaseVals[i].first == CaseVals[i+1].first) { |
| // If we have a duplicate, report it. |
| Diag(CaseVals[i+1].second->getLHS()->getLocStart(), |
| diag::err_duplicate_case, CaseVals[i].first.toString()); |
| Diag(CaseVals[i].second->getLHS()->getLocStart(), |
| diag::err_duplicate_case_prev); |
| // FIXME: We really want to remove the bogus case stmt from the substmt, |
| // but we have no way to do this right now. |
| CaseListIsErroneous = true; |
| } |
| } |
| } |
| |
| // Detect duplicate case ranges, which usually don't exist at all in the first |
| // place. |
| if (!CaseRanges.empty()) { |
| // Sort all the case ranges by their low value so we can easily detect |
| // overlaps between ranges. |
| std::stable_sort(CaseRanges.begin(), CaseRanges.end()); |
| |
| // Scan the ranges, computing the high values and removing empty ranges. |
| std::vector<llvm::APSInt> HiVals; |
| for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
| CaseStmt *CR = CaseRanges[i].second; |
| llvm::APSInt HiVal(32); |
| Expr *Hi = CR->getRHS(); |
| Hi->isIntegerConstantExpr(HiVal, Context); |
| |
| // Convert the value to the same width/sign as the condition. |
| ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, |
| CR->getRHS()->getLocStart(), |
| diag::warn_case_value_overflow); |
| |
| // If the LHS is not the same type as the condition, insert an implicit |
| // cast. |
| ImpCastExprToType(Hi, CondType); |
| CR->setRHS(Hi); |
| |
| // If the low value is bigger than the high value, the case is empty. |
| if (CaseRanges[i].first > HiVal) { |
| Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range, |
| SourceRange(CR->getLHS()->getLocStart(), |
| CR->getRHS()->getLocEnd())); |
| CaseRanges.erase(CaseRanges.begin()+i); |
| --i, --e; |
| continue; |
| } |
| HiVals.push_back(HiVal); |
| } |
| |
| // Rescan the ranges, looking for overlap with singleton values and other |
| // ranges. Since the range list is sorted, we only need to compare case |
| // ranges with their neighbors. |
| for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
| llvm::APSInt &CRLo = CaseRanges[i].first; |
| llvm::APSInt &CRHi = HiVals[i]; |
| CaseStmt *CR = CaseRanges[i].second; |
| |
| // Check to see whether the case range overlaps with any singleton cases. |
| CaseStmt *OverlapStmt = 0; |
| llvm::APSInt OverlapVal(32); |
| |
| // Find the smallest value >= the lower bound. If I is in the case range, |
| // then we have overlap. |
| CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), |
| CaseVals.end(), CRLo, |
| CaseCompareFunctor()); |
| if (I != CaseVals.end() && I->first < CRHi) { |
| OverlapVal = I->first; // Found overlap with scalar. |
| OverlapStmt = I->second; |
| } |
| |
| // Find the smallest value bigger than the upper bound. |
| I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); |
| if (I != CaseVals.begin() && (I-1)->first >= CRLo) { |
| OverlapVal = (I-1)->first; // Found overlap with scalar. |
| OverlapStmt = (I-1)->second; |
| } |
| |
| // Check to see if this case stmt overlaps with the subsequent case range. |
| if (i && CRLo <= HiVals[i-1]) { |
| OverlapVal = HiVals[i-1]; // Found overlap with range. |
| OverlapStmt = CaseRanges[i-1].second; |
| } |
| |
| if (OverlapStmt) { |
| // If we have a duplicate, report it. |
| Diag(CR->getLHS()->getLocStart(), |
| diag::err_duplicate_case, OverlapVal.toString()); |
| Diag(OverlapStmt->getLHS()->getLocStart(), |
| diag::err_duplicate_case_prev); |
| // FIXME: We really want to remove the bogus case stmt from the substmt, |
| // but we have no way to do this right now. |
| CaseListIsErroneous = true; |
| } |
| } |
| } |
| |
| // FIXME: If the case list was broken is some way, we don't have a good system |
| // to patch it up. Instead, just return the whole substmt as broken. |
| if (CaseListIsErroneous) |
| return true; |
| |
| return SS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnWhileStmt(SourceLocation WhileLoc, ExprTy *Cond, StmtTy *Body) { |
| Expr *condExpr = (Expr *)Cond; |
| assert(condExpr && "ActOnWhileStmt(): missing expression"); |
| |
| DefaultFunctionArrayConversion(condExpr); |
| QualType condType = condExpr->getType(); |
| |
| if (!condType->isScalarType()) // C99 6.8.5p2 |
| return Diag(WhileLoc, diag::err_typecheck_statement_requires_scalar, |
| condType.getAsString(), condExpr->getSourceRange()); |
| |
| return new WhileStmt(condExpr, (Stmt*)Body, WhileLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnDoStmt(SourceLocation DoLoc, StmtTy *Body, |
| SourceLocation WhileLoc, ExprTy *Cond) { |
| Expr *condExpr = (Expr *)Cond; |
| assert(condExpr && "ActOnDoStmt(): missing expression"); |
| |
| DefaultFunctionArrayConversion(condExpr); |
| QualType condType = condExpr->getType(); |
| |
| if (!condType->isScalarType()) // C99 6.8.5p2 |
| return Diag(DoLoc, diag::err_typecheck_statement_requires_scalar, |
| condType.getAsString(), condExpr->getSourceRange()); |
| |
| return new DoStmt((Stmt*)Body, condExpr, DoLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, |
| StmtTy *first, ExprTy *second, ExprTy *third, |
| SourceLocation RParenLoc, StmtTy *body) { |
| Stmt *First = static_cast<Stmt*>(first); |
| Expr *Second = static_cast<Expr*>(second); |
| Expr *Third = static_cast<Expr*>(third); |
| Stmt *Body = static_cast<Stmt*>(body); |
| |
| if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { |
| // C99 6.8.5p3: The declaration part of a 'for' statement shall only declare |
| // identifiers for objects having storage class 'auto' or 'register'. |
| for (ScopedDecl *D = DS->getDecl(); D; D = D->getNextDeclarator()) { |
| BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(D); |
| if (BVD && !BVD->hasLocalStorage()) |
| BVD = 0; |
| if (BVD == 0) |
| Diag(dyn_cast<ScopedDecl>(D)->getLocation(), |
| diag::err_non_variable_decl_in_for); |
| // FIXME: mark decl erroneous! |
| } |
| } |
| if (Second) { |
| DefaultFunctionArrayConversion(Second); |
| QualType SecondType = Second->getType(); |
| |
| if (!SecondType->isScalarType()) // C99 6.8.5p2 |
| return Diag(ForLoc, diag::err_typecheck_statement_requires_scalar, |
| SecondType.getAsString(), Second->getSourceRange()); |
| } |
| return new ForStmt(First, Second, Third, Body, ForLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, |
| SourceLocation LParenLoc, |
| StmtTy *first, ExprTy *second, |
| SourceLocation RParenLoc, StmtTy *body) { |
| Stmt *First = static_cast<Stmt*>(first); |
| Expr *Second = static_cast<Expr*>(second); |
| Stmt *Body = static_cast<Stmt*>(body); |
| if (First) { |
| QualType FirstType; |
| if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { |
| FirstType = cast<ValueDecl>(DS->getDecl())->getType(); |
| // C99 6.8.5p3: The declaration part of a 'for' statement shall only declare |
| // identifiers for objects having storage class 'auto' or 'register'. |
| ScopedDecl *D = DS->getDecl(); |
| BlockVarDecl *BVD = cast<BlockVarDecl>(D); |
| if (!BVD->hasLocalStorage()) |
| return Diag(BVD->getLocation(), diag::err_non_variable_decl_in_for); |
| if (D->getNextDeclarator()) |
| return Diag(D->getLocation(), diag::err_toomany_element_decls); |
| } |
| else |
| FirstType = static_cast<Expr*>(first)->getType(); |
| if (!isObjCObjectPointerType(FirstType)) |
| Diag(ForLoc, diag::err_selector_element_type, |
| FirstType.getAsString(), First->getSourceRange()); |
| } |
| if (Second) { |
| DefaultFunctionArrayConversion(Second); |
| QualType SecondType = Second->getType(); |
| if (!isObjCObjectPointerType(SecondType)) |
| Diag(ForLoc, diag::err_collection_expr_type, |
| SecondType.getAsString(), Second->getSourceRange()); |
| } |
| return new ObjCForCollectionStmt(First, Second, Body, ForLoc, RParenLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, |
| IdentifierInfo *LabelII) { |
| // Look up the record for this label identifier. |
| LabelStmt *&LabelDecl = LabelMap[LabelII]; |
| |
| // If we haven't seen this label yet, create a forward reference. |
| if (LabelDecl == 0) |
| LabelDecl = new LabelStmt(LabelLoc, LabelII, 0); |
| |
| return new GotoStmt(LabelDecl, GotoLoc, LabelLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnIndirectGotoStmt(SourceLocation GotoLoc,SourceLocation StarLoc, |
| ExprTy *DestExp) { |
| // FIXME: Verify that the operand is convertible to void*. |
| |
| return new IndirectGotoStmt((Expr*)DestExp); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { |
| Scope *S = CurScope->getContinueParent(); |
| if (!S) { |
| // C99 6.8.6.2p1: A break shall appear only in or as a loop body. |
| Diag(ContinueLoc, diag::err_continue_not_in_loop); |
| return true; |
| } |
| |
| return new ContinueStmt(ContinueLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { |
| Scope *S = CurScope->getBreakParent(); |
| if (!S) { |
| // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. |
| Diag(BreakLoc, diag::err_break_not_in_loop_or_switch); |
| return true; |
| } |
| |
| return new BreakStmt(BreakLoc); |
| } |
| |
| |
| Action::StmtResult |
| Sema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprTy *rex) { |
| Expr *RetValExp = static_cast<Expr *>(rex); |
| QualType FnRetType = CurFunctionDecl ? CurFunctionDecl->getResultType() : |
| CurMethodDecl->getResultType(); |
| |
| if (FnRetType->isVoidType()) { |
| if (RetValExp) // C99 6.8.6.4p1 (ext_ since GCC warns) |
| Diag(ReturnLoc, diag::ext_return_has_expr, |
| (CurFunctionDecl ? CurFunctionDecl->getIdentifier()->getName() : |
| CurMethodDecl->getSelector().getName()), |
| RetValExp->getSourceRange()); |
| return new ReturnStmt(ReturnLoc, RetValExp); |
| } else { |
| if (!RetValExp) { |
| const char *funcName = CurFunctionDecl ? |
| CurFunctionDecl->getIdentifier()->getName() : |
| CurMethodDecl->getSelector().getName().c_str(); |
| if (getLangOptions().C99) // C99 6.8.6.4p1 (ext_ since GCC warns) |
| Diag(ReturnLoc, diag::ext_return_missing_expr, funcName); |
| else // C90 6.6.6.4p4 |
| Diag(ReturnLoc, diag::warn_return_missing_expr, funcName); |
| return new ReturnStmt(ReturnLoc, (Expr*)0); |
| } |
| } |
| // we have a non-void function with an expression, continue checking |
| QualType RetValType = RetValExp->getType(); |
| |
| // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
| // function return. |
| AssignConvertType ConvTy = CheckSingleAssignmentConstraints(FnRetType, |
| RetValExp); |
| if (DiagnoseAssignmentResult(ConvTy, ReturnLoc, FnRetType, |
| RetValType, RetValExp, "returning")) |
| return true; |
| |
| if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
| |
| return new ReturnStmt(ReturnLoc, (Expr*)RetValExp); |
| } |
| |
| Sema::StmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, |
| bool IsSimple, |
| bool IsVolatile, |
| unsigned NumOutputs, |
| unsigned NumInputs, |
| std::string *Names, |
| ExprTy **Constraints, |
| ExprTy **Exprs, |
| ExprTy *AsmString, |
| unsigned NumClobbers, |
| ExprTy **Clobbers, |
| SourceLocation RParenLoc) { |
| Expr *E = (Expr *)AsmString; |
| |
| for (unsigned i = 0; i < NumOutputs; i++) { |
| StringLiteral *Literal = cast<StringLiteral>((Expr *)Constraints[i]); |
| assert(!Literal->isWide() && |
| "Output constraint strings should not be wide!"); |
| |
| std::string OutputConstraint(Literal->getStrData(), |
| Literal->getByteLength()); |
| |
| TargetInfo::ConstraintInfo info; |
| if (!Context.Target.validateOutputConstraint(OutputConstraint.c_str(), |
| info)) { |
| // FIXME: We currently leak memory here. |
| Diag(Literal->getLocStart(), |
| diag::err_invalid_output_constraint_in_asm); |
| return true; |
| } |
| |
| // Check that the output exprs are valid lvalues. |
| Expr *OutputExpr = (Expr *)Exprs[i]; |
| Expr::isLvalueResult Result = OutputExpr->isLvalue(); |
| if (Result != Expr::LV_Valid) { |
| ParenExpr *PE = cast<ParenExpr>(OutputExpr); |
| |
| Diag(PE->getSubExpr()->getLocStart(), |
| diag::err_invalid_lvalue_in_asm_output, |
| PE->getSubExpr()->getSourceRange()); |
| |
| // FIXME: We currently leak memory here. |
| return true; |
| } |
| } |
| |
| for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { |
| StringLiteral *Literal = cast<StringLiteral>((Expr *)Constraints[i]); |
| assert(!Literal->isWide() && |
| "Output constraint strings should not be wide!"); |
| |
| std::string InputConstraint(Literal->getStrData(), |
| Literal->getByteLength()); |
| |
| TargetInfo::ConstraintInfo info; |
| if (!Context.Target.validateInputConstraint(InputConstraint.c_str(), |
| NumOutputs, |
| info)) { |
| // FIXME: We currently leak memory here. |
| Diag(Literal->getLocStart(), |
| diag::err_invalid_input_constraint_in_asm); |
| return true; |
| } |
| |
| // Check that the input exprs aren't of type void. |
| Expr *InputExpr = (Expr *)Exprs[i]; |
| if (InputExpr->getType()->isVoidType()) { |
| ParenExpr *PE = cast<ParenExpr>(InputExpr); |
| |
| Diag(PE->getSubExpr()->getLocStart(), |
| diag::err_invalid_type_in_asm_input, |
| PE->getType().getAsString(), |
| PE->getSubExpr()->getSourceRange()); |
| |
| // FIXME: We currently leak memory here. |
| return true; |
| } |
| } |
| |
| // Check that the clobbers are valid. |
| for (unsigned i = 0; i < NumClobbers; i++) { |
| StringLiteral *Literal = cast<StringLiteral>((Expr *)Clobbers[i]); |
| assert(!Literal->isWide() && "Clobber strings should not be wide!"); |
| |
| llvm::SmallString<16> Clobber(Literal->getStrData(), |
| Literal->getStrData() + |
| Literal->getByteLength()); |
| |
| if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) { |
| Diag(Literal->getLocStart(), |
| diag::err_unknown_register_name_in_asm, |
| Clobber.c_str()); |
| |
| // FIXME: We currently leak memory here. |
| return true; |
| } |
| } |
| |
| return new AsmStmt(AsmLoc, |
| IsSimple, |
| IsVolatile, |
| NumOutputs, |
| NumInputs, |
| Names, |
| reinterpret_cast<StringLiteral**>(Constraints), |
| reinterpret_cast<Expr**>(Exprs), |
| cast<StringLiteral>(E), |
| NumClobbers, |
| reinterpret_cast<StringLiteral**>(Clobbers), |
| RParenLoc); |
| } |
| |
| Action::StmtResult |
| Sema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, |
| SourceLocation RParen, StmtTy *Parm, |
| StmtTy *Body, StmtTy *CatchList) { |
| ObjCAtCatchStmt *CS = new ObjCAtCatchStmt(AtLoc, RParen, |
| static_cast<Stmt*>(Parm), static_cast<Stmt*>(Body), |
| static_cast<Stmt*>(CatchList)); |
| return CatchList ? CatchList : CS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtTy *Body) { |
| ObjCAtFinallyStmt *FS = new ObjCAtFinallyStmt(AtLoc, |
| static_cast<Stmt*>(Body)); |
| return FS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc, |
| StmtTy *Try, StmtTy *Catch, StmtTy *Finally) { |
| ObjCAtTryStmt *TS = new ObjCAtTryStmt(AtLoc, static_cast<Stmt*>(Try), |
| static_cast<Stmt*>(Catch), |
| static_cast<Stmt*>(Finally)); |
| return TS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, StmtTy *Throw) { |
| ObjCAtThrowStmt *TS = new ObjCAtThrowStmt(AtLoc, static_cast<Stmt*>(Throw)); |
| return TS; |
| } |
| |
| Action::StmtResult |
| Sema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprTy *SynchExpr, |
| StmtTy *SynchBody) { |
| ObjCAtSynchronizedStmt *SS = new ObjCAtSynchronizedStmt(AtLoc, |
| static_cast<Stmt*>(SynchExpr), static_cast<Stmt*>(SynchBody)); |
| return SS; |
| } |
| |
| |