SemaStmt.cpp revision 4cffe2fd5c23168bc08f0453c684cbd3f79471d3
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- SemaStmt.cpp - Semantic Analysis for Statements ------------------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This file implements semantic analysis for statements. 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "Sema.h" 1551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson#include "clang/AST/APValue.h" 16f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner#include "clang/AST/ASTContext.h" 17c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/AST/DeclObjC.h" 185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/AST/Expr.h" 196fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/Diagnostic.h" 215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 23a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnExprStmt(ExprArg expr) { 24a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Expr *E = static_cast<Expr*>(expr.release()); 251b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 26a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 27834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 28834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 29834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 30a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 31834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 32a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 36a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 37a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(new NullStmt(SemiLoc)); 385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 40a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnDeclStmt(DeclTy *decl, 41a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 42a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 4381c018d9482e7cc2addadc6202dcf162a01faefdChris Lattner if (decl == 0) 44a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return StmtError(); 45a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 4681c018d9482e7cc2addadc6202dcf162a01faefdChris Lattner ScopedDecl *SD = cast<ScopedDecl>(static_cast<Decl *>(decl)); 47a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 488ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek // This is a temporary hack until we are always passing around 498ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek // DeclGroupRefs. 508ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek llvm::SmallVector<Decl*, 10> decls; 518ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek while (SD) { 528ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek ScopedDecl* d = SD; 538ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek SD = SD->getNextDeclarator(); 548ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek d->setNextDeclarator(0); 558ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek decls.push_back(d); 568ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek } 578ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek 588ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek assert (!decls.empty()); 59a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 608ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek if (decls.size() == 1) { 618ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek DeclGroupOwningRef DG(*decls.begin()); 62a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(new DeclStmt(DG, StartLoc, EndLoc)); 638ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek } 648ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek else { 6508631c5fa053867146b5ee8be658c229f6bf127cChris Lattner DeclGroupOwningRef DG(DeclGroup::Create(Context, decls.size(), &decls[0])); 66a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(new DeclStmt(DG, StartLoc, EndLoc)); 678ffb159441e923322bef6b5dee1aaf24c738d75eTed Kremenek } 685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 70a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlAction::OwningStmtResult 711b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 72a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 73a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 74a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 75c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 76c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 77c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 78c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 79c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 80c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 81c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 82c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 83c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 84c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 85c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 86c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 87c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 88c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 891bddf7e9c5f0243f0a2f65bc40b31e060ff260f3Ted Kremenek ScopedDecl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 90c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 91c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 92c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 9398414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 9498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 9598414c1b7d1944a57156d52e29bd41c005de09acChris Lattner Expr *E = dyn_cast<Expr>(Elts[i]); 9698414c1b7d1944a57156d52e29bd41c005de09acChris Lattner if (!E) continue; 9798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner 9898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about expressions with unused results. 9998414c1b7d1944a57156d52e29bd41c005de09acChris Lattner if (E->hasLocalSideEffect() || E->getType()->isVoidType()) 10098414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 10198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner 10298414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // The last expr in a stmt expr really is used. 10398414c1b7d1944a57156d52e29bd41c005de09acChris Lattner if (isStmtExpr && i == NumElts-1) 10498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 10598414c1b7d1944a57156d52e29bd41c005de09acChris Lattner 10698414c1b7d1944a57156d52e29bd41c005de09acChris Lattner /// DiagnoseDeadExpr - This expression is side-effect free and evaluated in 10798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner /// a context where the result is unused. Emit a diagnostic to warn about 10898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner /// this. 10998414c1b7d1944a57156d52e29bd41c005de09acChris Lattner if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) 110fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner Diag(BO->getOperatorLoc(), diag::warn_unused_expr) 111fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner << BO->getLHS()->getSourceRange() << BO->getRHS()->getSourceRange(); 11298414c1b7d1944a57156d52e29bd41c005de09acChris Lattner else if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) 113fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner Diag(UO->getOperatorLoc(), diag::warn_unused_expr) 114fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner << UO->getSubExpr()->getSourceRange(); 115a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl else 116fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner Diag(E->getExprLoc(), diag::warn_unused_expr) << E->getSourceRange(); 11798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 118a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 119a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(new CompoundStmt(Elts, NumElts, L, R)); 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 122117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 123117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlSema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, 124117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl SourceLocation DotDotDotLoc, ExprArg rhsval, 125117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl SourceLocation ColonLoc, StmtArg subStmt) { 126117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Stmt *SubStmt = static_cast<Stmt*>(subStmt.release()); 127117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl assert((lhsval.get() != 0) && "missing expression in case statement"); 128117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 13051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // However, GCC allows any evaluatable integer expression. 131d3a61d5ec5357d19b7c0b6b599231e68dc5e237fAnders Carlsson 132117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *LHSVal = static_cast<Expr*>(lhsval.get()); 133d3a61d5ec5357d19b7c0b6b599231e68dc5e237fAnders Carlsson if (VerifyIntegerConstantExpression(LHSVal)) 134117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 1355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1366c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 137117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 138117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *RHSVal = static_cast<Expr*>(rhsval.get()); 139117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl if (RHSVal && VerifyIntegerConstantExpression(RHSVal)) { 140f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 141117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval = 0; 142117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 143117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1448a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner if (SwitchStack.empty()) { 1458a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 146117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 1478a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 1485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 149117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl // Only now release the smart pointers. 150117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl lhsval.release(); 151117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval.release(); 152b5a69586f1b8855ee4c1f0bb7a8f0ff4fe32ce09Steve Naroff CaseStmt *CS = new CaseStmt(LHSVal, RHSVal, SubStmt, CaseLoc); 1538a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner SwitchStack.back()->addSwitchCase(CS); 154117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 1555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 157117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 1581b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 159117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl StmtArg subStmt, Scope *CurScope) { 160117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Stmt *SubStmt = static_cast<Stmt*>(subStmt.release()); 161117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1628a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner if (SwitchStack.empty()) { 1630fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 164117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 1650fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 166117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1670fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner DefaultStmt *DS = new DefaultStmt(DefaultLoc, SubStmt); 1688a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner SwitchStack.back()->addSwitchCase(DS); 169117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 1705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 172de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 1731b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 174de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl SourceLocation ColonLoc, StmtArg subStmt) { 175de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Stmt *SubStmt = static_cast<Stmt*>(subStmt.release()); 1765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelStmt *&LabelDecl = LabelMap[II]; 178de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 1805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl == 0) 181de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl = new LabelStmt(IdentLoc, II, SubStmt)); 182de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 184de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 1865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 1875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 18808631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 1895f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 190de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 1915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 192de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 1945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 1955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 1960fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 197de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 1985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 200de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 201de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnIfStmt(SourceLocation IfLoc, ExprArg CondVal, 202de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ThenVal, SourceLocation ElseLoc, 203de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ElseVal) { 204de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Expr *condExpr = (Expr *)CondVal.release(); 205de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2061b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnIfStmt(): missing expression"); 207de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 208c80b4eefa221f10871e7fed0ab9dc7d9d3d07dd0Steve Naroff DefaultFunctionArrayConversion(condExpr); 209de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl // Take ownership again until we're past the error checking. 210de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl CondVal = condExpr; 211c80b4eefa221f10871e7fed0ab9dc7d9d3d07dd0Steve Naroff QualType condType = condExpr->getType(); 212de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2135921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 2145921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 215de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 2165921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else if (!condType->isScalarType()) // C99 6.8.4.1p1 217de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(Diag(IfLoc, diag::err_typecheck_statement_requires_scalar) 218de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl << condType << condExpr->getSourceRange()); 219de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 220de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Stmt *thenStmt = (Stmt *)ThenVal.release(); 2215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2222d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2232d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2242d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2252d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 226de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl if (!ElseVal.get()) { 2272d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2282d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2292d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2302d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 231de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl CondVal.release(); 232de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(new IfStmt(IfLoc, condExpr, thenStmt, (Stmt*)ElseVal.release())); 2335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 235de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 236de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnStartOfSwitchStmt(ExprArg cond) { 237de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Expr *Cond = static_cast<Expr*>(cond.release()); 238de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2395921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 2405921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // C++ 6.4.2.p2: 2415921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // The condition shall be of integral type, enumeration type, or of a class 2425921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // type for which a single conversion function to integral or enumeration 2435921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // type exists (12.3). If the condition is of class type, the condition is 2445921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // converted by calling that conversion function, and the result of the 2455921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // conversion is used in place of the original condition for the remainder 2465921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // of this section. Integral promotions are performed. 2475921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis 2485921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis QualType Ty = Cond->getType(); 2495921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis 2505921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: Handle class types. 2515921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis 2525921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // If the type is wrong a diagnostic will be emitted later at 2535921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // ActOnFinishSwitchStmt. 2545921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (Ty->isIntegralType() || Ty->isEnumeralType()) { 2555921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // Integral promotions are performed. 2565921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: Integral promotions for C++ are not complete. 2575921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis UsualUnaryConversions(Cond); 2585921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 2595921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else { 2605921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 2615921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis UsualUnaryConversions(Cond); 2625921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 263de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 264f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner SwitchStmt *SS = new SwitchStmt(Cond); 265c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SwitchStack.push_back(SS); 266de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 267c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson} 2686c36be5b383875b490684bcf439d6d427298c1afChris Lattner 269f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 270f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 271f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 272f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 273f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 274f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner SourceLocation Loc, 275f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 276f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 277f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 278f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 279f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 280f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 281f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 282f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If the input was signed and negative and the output is unsigned, 283f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // warn. 284f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) 285d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 286f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 287f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 288f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 289f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 290f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 291f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 292b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 293f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 294b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 295f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 296d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 297f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 298f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 299f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 300f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 301b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 302f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 303f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 304f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 305f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 306f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 307f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 308f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (Val.isNegative()) // Sign bit changes meaning. 309d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 310f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 311f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 312f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3130471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3140471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3150471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3160471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3170471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3180471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3190e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3200e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3210e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3220e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3230471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3240471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3250471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3260471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3270471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3280471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3290471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 330764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 331764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 332764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 333764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 334764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 335764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 336764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 337764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 338764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 339764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 340764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 341764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 342764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 343764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 344de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 345de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 346de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 347de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Stmt *BodyStmt = (Stmt*)Body.release(); 348de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 349c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SwitchStmt *SS = SwitchStack.back(); 350de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 351de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 3529dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 353c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SwitchStack.pop_back(); 354c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 355f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 356f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner QualType CondType = CondExpr->getType(); 357de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 358f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (!CondType->isIntegerType()) { // C99 6.8.4.2p1 359d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 360d162584991885ab004a02573a73ce06422b921fcChris Lattner << CondType << CondExpr->getSourceRange(); 361de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 362c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 363de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 364f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 365f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 36698be4943e8dc4f3905629a7102668960873cf863Chris Lattner unsigned CondWidth = static_cast<unsigned>(Context.getTypeSize(CondType)); 367f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner bool CondIsSigned = CondType->isSignedIntegerType(); 368f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 369f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 370f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 371f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 3720471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 3730471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 374f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 375f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 376f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 377f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 378f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 379c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 380b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 381b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 382b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner for (SwitchCase *SC = SS->getSwitchCaseList(); SC; 383c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 384b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 385c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 386f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 387f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 3885f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 389de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 390f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 391f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // we'll return a valid AST. This requires recursing down the 392f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // AST and finding it, not something we are set up to do right now. For 393f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // now, just lop the entire switch stmt out of the AST. 394b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 395c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 396f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 397c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 398f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 399f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 400f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 401f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 402f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 4031e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 40451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 405f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 406f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 407f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 408f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 409f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 4106c36be5b383875b490684bcf439d6d427298c1afChris Lattner 4111e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 4121e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 4131e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner ImpCastExprToType(Lo, CondType); 4141e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 4151e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner 416b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 417f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (CS->getRHS()) 418f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 419b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner else 420b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 421f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 422f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 423f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 424b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // Sort all the scalar case values so we can easily detect duplicates. 425764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 426b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 427f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner if (!CaseVals.empty()) { 428f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 429f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner if (CaseVals[i].first == CaseVals[i+1].first) { 430f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner // If we have a duplicate, report it. 431f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 432d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner diag::err_duplicate_case) << CaseVals[i].first.toString(10); 433f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner Diag(CaseVals[i].second->getLHS()->getLocStart(), 4345f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner diag::note_duplicate_case_prev); 435f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner // FIXME: We really want to remove the bogus case stmt from the substmt, 436f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner // but we have no way to do this right now. 437f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner CaseListIsErroneous = true; 438f334850cd2fc2d4ac9b585f80d97b4f0097a0348Chris Lattner } 439b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 440b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 441f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 442b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // Detect duplicate case ranges, which usually don't exist at all in the first 443b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // place. 444b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (!CaseRanges.empty()) { 445b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // Sort all the case ranges by their low value so we can easily detect 446b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // overlaps between ranges. 4470471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 448b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 449b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // Scan the ranges, computing the high values and removing empty ranges. 450b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner std::vector<llvm::APSInt> HiVals; 4516efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 452b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseStmt *CR = CaseRanges[i].second; 4531e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Hi = CR->getRHS(); 45451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 455b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 456b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // Convert the value to the same width/sign as the condition. 457b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 458b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CR->getRHS()->getLocStart(), 459b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner diag::warn_case_value_overflow); 460b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 4611e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 4621e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 4631e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner ImpCastExprToType(Hi, CondType); 4641e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CR->setRHS(Hi); 4651e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner 4666efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner // If the low value is bigger than the high value, the case is empty. 4676efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner if (CaseRanges[i].first > HiVal) { 468dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 469dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << SourceRange(CR->getLHS()->getLocStart(), 470dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner CR->getRHS()->getLocEnd()); 4716efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner CaseRanges.erase(CaseRanges.begin()+i); 4726efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner --i, --e; 4736efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner continue; 4746efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 475b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner HiVals.push_back(HiVal); 476b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 477b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 478b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // Rescan the ranges, looking for overlap with singleton values and other 4790471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // ranges. Since the range list is sorted, we only need to compare case 4800471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // ranges with their neighbors. 481b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 4820471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner llvm::APSInt &CRLo = CaseRanges[i].first; 4830471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner llvm::APSInt &CRHi = HiVals[i]; 4840471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseStmt *CR = CaseRanges[i].second; 4850471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 4860471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // Check to see whether the case range overlaps with any singleton cases. 4870471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseStmt *OverlapStmt = 0; 4880471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner llvm::APSInt OverlapVal(32); 4890471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 4900471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // Find the smallest value >= the lower bound. If I is in the case range, 4910471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // then we have overlap. 4920471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 4930471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseVals.end(), CRLo, 4940471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseCompareFunctor()); 4950471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner if (I != CaseVals.end() && I->first < CRHi) { 4960471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner OverlapVal = I->first; // Found overlap with scalar. 4970471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner OverlapStmt = I->second; 4980471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4990471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 5000471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // Find the smallest value bigger than the upper bound. 5010471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 5020471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 5030471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner OverlapVal = (I-1)->first; // Found overlap with scalar. 5040471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner OverlapStmt = (I-1)->second; 5050471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 5060471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 5070471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // Check to see if this case stmt overlaps with the subsequent case range. 5080471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner if (i && CRLo <= HiVals[i-1]) { 5090471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner OverlapVal = HiVals[i-1]; // Found overlap with range. 5100471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner OverlapStmt = CaseRanges[i-1].second; 5110471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 512b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 5130471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner if (OverlapStmt) { 5140471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // If we have a duplicate, report it. 515d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 516d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner << OverlapVal.toString(10); 5170471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner Diag(OverlapStmt->getLHS()->getLocStart(), 5185f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner diag::note_duplicate_case_prev); 5190471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // FIXME: We really want to remove the bogus case stmt from the substmt, 5200471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner // but we have no way to do this right now. 5210471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseListIsErroneous = true; 5220471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 523b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 524b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 525f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 526b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // FIXME: If the case list was broken is some way, we don't have a good system 527b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // to patch it up. Instead, just return the whole substmt as broken. 528b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 529de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 530de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 531de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 532de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 5335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 535f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 536f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnWhileStmt(SourceLocation WhileLoc, ExprArg Cond, StmtArg Body) { 537f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *condExpr = (Expr *)Cond.release(); 5381b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnWhileStmt(): missing expression"); 539f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 540c80b4eefa221f10871e7fed0ab9dc7d9d3d07dd0Steve Naroff DefaultFunctionArrayConversion(condExpr); 541f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond = condExpr; 542c80b4eefa221f10871e7fed0ab9dc7d9d3d07dd0Steve Naroff QualType condType = condExpr->getType(); 543f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5445921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 5455921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 546f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(); 5475921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else if (!condType->isScalarType()) // C99 6.8.5p2 548f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(WhileLoc, 549f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_typecheck_statement_requires_scalar) 550f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << condType << condExpr->getSourceRange()); 5515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 552f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 553f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return Owned(new WhileStmt(condExpr, (Stmt*)Body.release(), WhileLoc)); 5545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 556f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 557f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 558f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation WhileLoc, ExprArg Cond) { 559f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *condExpr = (Expr *)Cond.release(); 5601b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 561f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 562c80b4eefa221f10871e7fed0ab9dc7d9d3d07dd0Steve Naroff DefaultFunctionArrayConversion(condExpr); 563f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond = condExpr; 564c80b4eefa221f10871e7fed0ab9dc7d9d3d07dd0Steve Naroff QualType condType = condExpr->getType(); 565f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5666314ff264c345b5babb9faf50dad0bc68d7bd74eArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 5676314ff264c345b5babb9faf50dad0bc68d7bd74eArgyrios Kyrtzidis if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 568f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(); 5696314ff264c345b5babb9faf50dad0bc68d7bd74eArgyrios Kyrtzidis } else if (!condType->isScalarType()) // C99 6.8.5p2 570f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(DoLoc, diag::err_typecheck_statement_requires_scalar) 571f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << condType << condExpr->getSourceRange()); 5725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 573f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 574f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return Owned(new DoStmt((Stmt*)Body.release(), condExpr, DoLoc)); 5755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 577f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 578f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 579f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, ExprArg third, 580f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 581f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 582f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 583f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Third = static_cast<Expr*>(third.get()); 584f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 585f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5865921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 5875921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 588f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 589f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 590f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 5915921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 5925921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 5935921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 5945921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 5955921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 5965921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 5975921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 5985921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 5995921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 600ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 6015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (Second) { 60336c4b0ec13453bc003bbac380770b45ae35ef19cChris Lattner DefaultFunctionArrayConversion(Second); 60436c4b0ec13453bc003bbac380770b45ae35ef19cChris Lattner QualType SecondType = Second->getType(); 605f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6065921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 6075921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (CheckCXXBooleanCondition(Second)) // C++ 6.4p4 608f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(); 6095921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else if (!SecondType->isScalarType()) // C99 6.8.5p2 610f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(ForLoc, 611f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_typecheck_statement_requires_scalar) 612f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << SecondType << Second->getSourceRange()); 6135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 614f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 615f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 616f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl third.release(); 617f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 618f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return Owned(new ForStmt(First, Second, Third, Body, ForLoc)); 6195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 621f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 622f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 623f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 624f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 625f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 626f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 627f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 628f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 62920552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 63020552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 63120552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 632f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek if (!DS->hasSolitaryDecl()) 633f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 634f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 635f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 636f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek ScopedDecl *D = DS->getSolitaryDecl(); 637f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 638f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 639f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 640f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 641248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 642248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 643f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 644f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 6451fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 6461fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson Expr::isLvalueResult lval = cast<Expr>(First)->isLvalue(Context); 647f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6481fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson if (lval != Expr::LV_Valid) 649f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 650f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 651f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 6521fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 653f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl FirstType = static_cast<Expr*>(First)->getType(); 6541fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 655b6ccaac65ca72f72954eb3893bbd940bedd23f00Ted Kremenek if (!Context.isObjCObjectPointerType(FirstType)) 656dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 657d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 6583ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 6593ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian if (Second) { 6603ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian DefaultFunctionArrayConversion(Second); 6613ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 662b6ccaac65ca72f72954eb3893bbd940bedd23f00Ted Kremenek if (!Context.isObjCObjectPointerType(SecondType)) 663dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 664d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 6653ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 666f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 667f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 668f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 669f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return Owned(new ObjCForCollectionStmt(First, Second, Body, 670f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl ForLoc, RParenLoc)); 6713ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 6725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6734cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 6741b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 6755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 6764eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If we are in a block, reject all gotos for now. 6774eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 6784cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 6794eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff 6805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 6815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelStmt *&LabelDecl = LabelMap[LabelII]; 6825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If we haven't seen this label yet, create a forward reference. 6845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl == 0) 6855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl = new LabelStmt(LabelLoc, LabelII, 0); 6864cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 6874cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 6885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6904cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 6911b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc,SourceLocation StarLoc, 6924cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 6935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: Verify that the operand is convertible to void*. 6944cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 6954cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new IndirectGotoStmt((Expr*)DestExp.release())); 6965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6984cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 6991b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 7005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 7015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 7025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 7034cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 7045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7054cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7064cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ContinueStmt(ContinueLoc)); 7075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7094cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7101b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 7115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 7125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 7135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 7144cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 7155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7164cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7174cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new BreakStmt(BreakLoc)); 7185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 72027c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 7214eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 7224cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7234eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 7244cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7254eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 7264eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 7274eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType == 0) { 728c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 72916564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 73016564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 73116564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff DefaultFunctionArrayConversion(RetValExp); 7324eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff CurBlock->ReturnType = RetValExp->getType().getTypePtr(); 733c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 7344eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff CurBlock->ReturnType = Context.VoidTy.getTypePtr(); 7354cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ReturnStmt(ReturnLoc, RetValExp)); 7364eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7374cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7384eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 7394eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 7404eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 7414eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 7424eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 7434eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 7444eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff delete RetValExp; 7454eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 7464eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7474cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ReturnStmt(ReturnLoc, RetValExp)); 7484eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7494cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7504cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl if (!RetValExp) 7514cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 7524cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7534eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // we have a non-void block with an expression, continue checking 7544eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff QualType RetValType = RetValExp->getType(); 7554cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7564eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // For now, restrict multiple return statements in a block to have 7574eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // strict compatible types only. 7584eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff QualType BlockQT = QualType(CurBlock->ReturnType, 0); 7594eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (Context.getCanonicalType(BlockQT).getTypePtr() 7604eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff != Context.getCanonicalType(RetValType).getTypePtr()) { 7614cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // FIXME: non-localizable string in diagnostic 7624eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff DiagnoseAssignmentResult(Incompatible, ReturnLoc, BlockQT, 7634eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValType, RetValExp, "returning"); 7644cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 7654eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7664cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7674eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) CheckReturnStackAddr(RetValExp, BlockQT, ReturnLoc); 7684cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7694cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ReturnStmt(ReturnLoc, RetValExp)); 7704eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 7715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7724cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7734cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 7744cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl Expr *RetValExp = static_cast<Expr *>(rex.release()); 7754eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 7764eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 7774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 778371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 779371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 780371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 781371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner else 782371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = getCurMethodDecl()->getResultType(); 7835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7845cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 7853c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (RetValExp) {// C99 6.8.6.4p1 (ext_ since GCC warns) 78665ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 78765ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 78865ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 7894cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 790e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 791e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 792e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 793e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 794e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 795e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 796e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 797e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 7985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7994cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ReturnStmt(ReturnLoc, RetValExp)); 8005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8014cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8023c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (!RetValExp) { 8033c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 8043c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 8053c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 8063c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 8073c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 80808631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 8093c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 81008631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 8114cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ReturnStmt(ReturnLoc, (Expr*)0)); 8123c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner } 8134cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 814898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 815898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // we have a non-void function with an expression, continue checking 816898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor QualType RetValType = RetValExp->getType(); 8174cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 818898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 819898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 8204cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // function return. 8214cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 822898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // In C++ the return statement is handled via a copy initialization. 8234cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // the C version of which boils down to CheckSingleAssignmentConstraints. 8244cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // FIXME: Leaks RetValExp. 825898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 8264cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 8274cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 828898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 829898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 830898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor 8314cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return Owned(new ReturnStmt(ReturnLoc, RetValExp)); 8325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8346a0ef4b83c91a6d6d5acb4ed5577c4659fe022a3Anders CarlssonSema::StmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 83508631c5fa053867146b5ee8be658c229f6bf127cChris Lattner bool IsSimple, 83639c47b56f45437bbc49c9568b7308a400234a730Anders Carlsson bool IsVolatile, 837b235fc2cf37621c7fc6511bb2b8788c95f9fb9fcAnders Carlsson unsigned NumOutputs, 838b235fc2cf37621c7fc6511bb2b8788c95f9fb9fcAnders Carlsson unsigned NumInputs, 839b235fc2cf37621c7fc6511bb2b8788c95f9fb9fcAnders Carlsson std::string *Names, 8401708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner ExprTy **constraints, 8411708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner ExprTy **exprs, 8426bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner ExprTy *asmString, 843b235fc2cf37621c7fc6511bb2b8788c95f9fb9fcAnders Carlsson unsigned NumClobbers, 8441708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner ExprTy **clobbers, 845fe795956194141c91ae555985c9b930595bff43fChris Lattner SourceLocation RParenLoc) { 8461708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral **Constraints = reinterpret_cast<StringLiteral**>(constraints); 8471708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner Expr **Exprs = reinterpret_cast<Expr **>(exprs); 8486bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString); 8491708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers); 8501708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner 8511708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 8526bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 8536bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner // FIXME: We currently leak memory here. 854dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner return Diag(AsmString->getLocStart(), diag::err_asm_wide_character) 855dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << AsmString->getSourceRange(); 8566bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner 8576bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner 8581708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 8591708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 8606bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 8616bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner // FIXME: We currently leak memory here. 862dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner return Diag(Literal->getLocStart(), diag::err_asm_wide_character) 863dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << Literal->getSourceRange(); 8646bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner 865d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson std::string OutputConstraint(Literal->getStrData(), 866d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson Literal->getByteLength()); 867d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson 868d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson TargetInfo::ConstraintInfo info; 8696bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.validateOutputConstraint(OutputConstraint.c_str(),info)) 870d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // FIXME: We currently leak memory here. 8716bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner return Diag(Literal->getLocStart(), 872f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner diag::err_asm_invalid_output_constraint) << OutputConstraint; 873d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson 874d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 8751708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner ParenExpr *OutputExpr = cast<ParenExpr>(Exprs[i]); 87628be73f74c9e241a23ea24fe5756623de6bf1084Chris Lattner Expr::isLvalueResult Result = OutputExpr->isLvalue(Context); 87704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson if (Result != Expr::LV_Valid) { 87804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson // FIXME: We currently leak memory here. 8791708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner return Diag(OutputExpr->getSubExpr()->getLocStart(), 880dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 881dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << OutputExpr->getSubExpr()->getSourceRange(); 88204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 88304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 88404728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson 88504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 8861708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 8876bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 8886bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner // FIXME: We currently leak memory here. 889dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner return Diag(Literal->getLocStart(), diag::err_asm_wide_character) 890dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << Literal->getSourceRange(); 891d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson 892d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson std::string InputConstraint(Literal->getStrData(), 893d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson Literal->getByteLength()); 894d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson 895d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson TargetInfo::ConstraintInfo info; 896d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson if (!Context.Target.validateInputConstraint(InputConstraint.c_str(), 89745b050e72d058131e6f169fe54888bb91a003fb5Anders Carlsson &Names[0], 89845b050e72d058131e6f169fe54888bb91a003fb5Anders Carlsson &Names[0] + NumOutputs, info)) { 899d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // FIXME: We currently leak memory here. 9006bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner return Diag(Literal->getLocStart(), 901dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_input_constraint) << InputConstraint; 902d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 90304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson 904d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the input exprs aren't of type void. 9051708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner ParenExpr *InputExpr = cast<ParenExpr>(Exprs[i]); 90604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson if (InputExpr->getType()->isVoidType()) { 90704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson 90804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson // FIXME: We currently leak memory here. 9091708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner return Diag(InputExpr->getSubExpr()->getLocStart(), 910fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner diag::err_asm_invalid_type_in_input) 911d162584991885ab004a02573a73ce06422b921fcChris Lattner << InputExpr->getType() << InputConstraint 912fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner << InputExpr->getSubExpr()->getSourceRange(); 91304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 914562489e0c8bbfc2490377542590e048cde822934Anders Carlsson 915562489e0c8bbfc2490377542590e048cde822934Anders Carlsson if (info & TargetInfo::CI_AllowsRegister) 916562489e0c8bbfc2490377542590e048cde822934Anders Carlsson DefaultFunctionArrayConversion(Exprs[i]); 91704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 918b235fc2cf37621c7fc6511bb2b8788c95f9fb9fcAnders Carlsson 9196fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 9201708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 9211708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 9226bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 9236bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner // FIXME: We currently leak memory here. 924dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner return Diag(Literal->getLocStart(), diag::err_asm_wide_character) 925dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << Literal->getSourceRange(); 9266fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson 9276fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson llvm::SmallString<16> Clobber(Literal->getStrData(), 9286fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson Literal->getStrData() + 9296fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson Literal->getByteLength()); 9306fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson 9316bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 9326fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // FIXME: We currently leak memory here. 9336bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner return Diag(Literal->getLocStart(), 934f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner diag::err_asm_unknown_register_name) << Clobber.c_str(); 9356fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 9366fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson 9371708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner return new AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 9381708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner Names, Constraints, Exprs, AsmString, NumClobbers, 9391708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner Clobbers, RParenLoc); 940fe795956194141c91ae555985c9b930595bff43fChris Lattner} 9413b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 9423b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz JahanianAction::StmtResult 943a526c5c67e5a0473c340903ee542ce570119665fTed KremenekSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 9443b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian SourceLocation RParen, StmtTy *Parm, 9453b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian StmtTy *Body, StmtTy *CatchList) { 946a526c5c67e5a0473c340903ee542ce570119665fTed Kremenek ObjCAtCatchStmt *CS = new ObjCAtCatchStmt(AtLoc, RParen, 9473b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian static_cast<Stmt*>(Parm), static_cast<Stmt*>(Body), 9483b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian static_cast<Stmt*>(CatchList)); 9493b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian return CatchList ? CatchList : CS; 9503b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 9513b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 952161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz JahanianAction::StmtResult 953a526c5c67e5a0473c340903ee542ce570119665fTed KremenekSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtTy *Body) { 954a526c5c67e5a0473c340903ee542ce570119665fTed Kremenek ObjCAtFinallyStmt *FS = new ObjCAtFinallyStmt(AtLoc, 955161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian static_cast<Stmt*>(Body)); 956161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian return FS; 957161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 958bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 959bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz JahanianAction::StmtResult 960a526c5c67e5a0473c340903ee542ce570119665fTed KremenekSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 961bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian StmtTy *Try, StmtTy *Catch, StmtTy *Finally) { 962a526c5c67e5a0473c340903ee542ce570119665fTed Kremenek ObjCAtTryStmt *TS = new ObjCAtTryStmt(AtLoc, static_cast<Stmt*>(Try), 963bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian static_cast<Stmt*>(Catch), 964bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian static_cast<Stmt*>(Finally)); 965bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian return TS; 966bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 967bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 96839f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz JahanianAction::StmtResult 969a526c5c67e5a0473c340903ee542ce570119665fTed KremenekSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, StmtTy *Throw) { 970a526c5c67e5a0473c340903ee542ce570119665fTed Kremenek ObjCAtThrowStmt *TS = new ObjCAtThrowStmt(AtLoc, static_cast<Stmt*>(Throw)); 97139f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian return TS; 97239f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 973bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 974fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz JahanianAction::StmtResult 975fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz JahanianSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprTy *SynchExpr, 976fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian StmtTy *SynchBody) { 977fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian ObjCAtSynchronizedStmt *SS = new ObjCAtSynchronizedStmt(AtLoc, 978a0f55792409289d1d343023fa8292cff6355e538Fariborz Jahanian static_cast<Stmt*>(SynchExpr), static_cast<Stmt*>(SynchBody)); 979fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian return SS; 980fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 9814b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 9824b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 9834b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 9844b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 9854b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclTy *ExDecl, 9864b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 9874b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 9884b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl return Owned(new CXXCatchStmt(CatchLoc, static_cast<VarDecl*>(ExDecl), 9894b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl static_cast<Stmt*>(HandlerBlock.release()))); 9904b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 9918351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 9928351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 9938351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 9948351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 9958351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 9968351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 9978351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 9988351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 9998351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 10008351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 10018351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 10028351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl for(unsigned i = 0; i < NumHandlers - 1; ++i) { 10038351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 10048351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl if (!Handler->getExceptionDecl()) 10058351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl return StmtError(Diag(Handler->getLocStart(), diag::err_early_catch_all)); 10068351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 10078351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers for the same type as an earlier one. 10088351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // This one is rather easy. 10098351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 10108351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 10118351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 10128351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 10138351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 10148351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 10158351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 10168351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl return Owned(new CXXTryStmt(TryLoc, static_cast<Stmt*>(TryBlock.release()), 10178351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Handlers, NumHandlers)); 10188351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1019