SemaStmt.cpp revision dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9
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" 1916f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtObjC.h" 2016f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtCXX.h" 216fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 24a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnExprStmt(ExprArg expr) { 25f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *E = expr.takeAs<Expr>(); 261b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 27a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 28834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 29834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 30834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 31a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 32834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 33a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 37a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 388189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) NullStmt(SemiLoc)); 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 41682bf92db408a6cbc3d37b5496a99b6ef85041ecChris LattnerSema::OwningStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 42a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 43a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 4420401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 4520401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner 46682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 4720401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 48682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner 4924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 52a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlAction::OwningStmtResult 531b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 54a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 55a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 56a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 57c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 58c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 59c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 60c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 61c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 62c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 63c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 64c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 65c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 66c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 67c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 68c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 69c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 70c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 714afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 72c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 73c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 74c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 7598414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 7698414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 7798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner Expr *E = dyn_cast<Expr>(Elts[i]); 7898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner if (!E) continue; 7998414c1b7d1944a57156d52e29bd41c005de09acChris Lattner 80026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner // Warn about expressions with unused results if they are non-void and if 81026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner // this not the last stmt in a stmt expr. 82026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner if (E->getType()->isVoidType() || (isStmtExpr && i == NumElts-1)) 8398414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 8498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner 85026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner SourceLocation Loc; 86026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner SourceRange R1, R2; 87026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner if (!E->isUnusedResultAWarning(Loc, R1, R2)) 8898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 89026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner 90026dc96ac6ece60da5e1b98e2a71bd0ff0939fd8Chris Lattner Diag(Loc, diag::warn_unused_expr) << R1 << R2; 9198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 92a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 938189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 96117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 97117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlSema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, 98117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl SourceLocation DotDotDotLoc, ExprArg rhsval, 9924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 100117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl assert((lhsval.get() != 0) && "missing expression in case statement"); 101117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 10351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // However, GCC allows any evaluatable integer expression. 104117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *LHSVal = static_cast<Expr*>(lhsval.get()); 105dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 106dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 10724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1096c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 110117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 111117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *RHSVal = static_cast<Expr*>(rhsval.get()); 112dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 113dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 114f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 115117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval = 0; 116117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 117117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 118bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 1198a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 12024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1218a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 1225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 123117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl // Only now release the smart pointers. 124117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl lhsval.release(); 125117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval.release(); 126dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 127dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 128bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(CS); 129117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 1305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 13224e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 13324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattnervoid Sema::ActOnCaseStmtBody(StmtTy *caseStmt, StmtArg subStmt) { 13424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 135f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 13624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 13724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 13824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 139117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 1401b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 141117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl StmtArg subStmt, Scope *CurScope) { 142f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 143117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 144bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 1450fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 146117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 1470fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 148117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 149dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 150bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(DS); 151117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 1525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 154de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 1551b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 156de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl SourceLocation ColonLoc, StmtArg subStmt) { 157f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 1585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 159ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[II]; 160de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 162caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 163caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 164de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 166de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 1685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 1695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 17008631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 1715f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 172de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 1735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 174de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 1765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 1780fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 179de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 1805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 182de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 183de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnIfStmt(SourceLocation IfLoc, ExprArg CondVal, 184de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ThenVal, SourceLocation ElseLoc, 185de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ElseVal) { 186e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = CondVal.takeAs<Expr>(); 187de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1881b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnIfStmt(): missing expression"); 189de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 190d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor if (!condExpr->isTypeDependent()) { 191d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor DefaultFunctionArrayConversion(condExpr); 192d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor // Take ownership again until we're past the error checking. 193d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor CondVal = condExpr; 194d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor QualType condType = condExpr->getType(); 195d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor 196d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor if (getLangOptions().CPlusPlus) { 197d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 198d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor return StmtError(); 199d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor } else if (!condType->isScalarType()) // C99 6.8.4.1p1 200d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor return StmtError(Diag(IfLoc, 201d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor diag::err_typecheck_statement_requires_scalar) 202d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor << condType << condExpr->getSourceRange()); 203d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor } 204de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 205e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *thenStmt = ThenVal.takeAs<Stmt>(); 2065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2072d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2082d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2092d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2102d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 211de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl if (!ElseVal.get()) { 2122d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2132d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2142d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2152d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 216de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl CondVal.release(); 2178189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) IfStmt(IfLoc, condExpr, thenStmt, 218d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor ElseLoc, ElseVal.takeAs<Stmt>())); 2195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 221de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 222de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnStartOfSwitchStmt(ExprArg cond) { 223f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *Cond = cond.takeAs<Expr>(); 224de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2255921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 2265921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // C++ 6.4.2.p2: 2275921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // The condition shall be of integral type, enumeration type, or of a class 2285921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // type for which a single conversion function to integral or enumeration 2295921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // type exists (12.3). If the condition is of class type, the condition is 2305921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // converted by calling that conversion function, and the result of the 2315921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // conversion is used in place of the original condition for the remainder 2325921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // of this section. Integral promotions are performed. 233dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!Cond->isTypeDependent()) { 234dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor QualType Ty = Cond->getType(); 235dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 236dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: Handle class types. 237dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 238dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the type is wrong a diagnostic will be emitted later at 239dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ActOnFinishSwitchStmt. 240dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Ty->isIntegralType() || Ty->isEnumeralType()) { 241dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Integral promotions are performed. 242dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: Integral promotions for C++ are not complete. 243dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor UsualUnaryConversions(Cond); 244dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 2455921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 2465921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else { 2475921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 2485921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis UsualUnaryConversions(Cond); 2495921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 250de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2518189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek SwitchStmt *SS = new (Context) SwitchStmt(Cond); 252bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().push_back(SS); 253de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 254c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson} 2556c36be5b383875b490684bcf439d6d427298c1afChris Lattner 256f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 257f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 258f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 259f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 260f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 261f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner SourceLocation Loc, 262f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 263f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 264f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 265f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 266f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 267f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 268f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 269f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If the input was signed and negative and the output is unsigned, 270f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // warn. 271f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) 272d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 273f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 274f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 275f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 276f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 277f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 278f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 279b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 280f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 281b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 282f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 283d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 284f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 285f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 286f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 287f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 288b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 289f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 290f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 291f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 292f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 293f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 294f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 295f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (Val.isNegative()) // Sign bit changes meaning. 296d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 297f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 298f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 299f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3000471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3010471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3020471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3030471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3040471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3050471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3060e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3070e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3080e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3090e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3100471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3110471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3120471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3130471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3140471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3150471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3160471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 317764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 318764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 319764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 320764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 321764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 322764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 323764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 324764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 325764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 326764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 327764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 328764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 329764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 330764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 331de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 332de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 333de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 334e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *BodyStmt = Body.takeAs<Stmt>(); 335de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 336bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner SwitchStmt *SS = getSwitchStack().back(); 337de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 338de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 3399dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 340bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().pop_back(); 341c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 342f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 343f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner QualType CondType = CondExpr->getType(); 344de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 345dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CondExpr->isTypeDependent() && 346dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor !CondType->isIntegerType()) { // C99 6.8.4.2p1 347d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 348d162584991885ab004a02573a73ce06422b921fcChris Lattner << CondType << CondExpr->getSourceRange(); 349de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 350c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 351de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 352f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 353f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 354dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor bool HasDependentValue 355dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 356dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor unsigned CondWidth 357dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 358dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor : static_cast<unsigned>(Context.getTypeSize(CondType)); 359f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner bool CondIsSigned = CondType->isSignedIntegerType(); 360f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 361f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 362f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 363f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 3640471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 3650471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 366f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 367f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 368f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 369f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 370f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 371c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 372b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 373b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 374dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 375c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 376b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 377c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 378f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 379f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 3805f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 381de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 382f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 383f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // we'll return a valid AST. This requires recursing down the 384f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // AST and finding it, not something we are set up to do right now. For 385f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // now, just lop the entire switch stmt out of the AST. 386b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 387c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 388f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 389c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 390f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 391f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 392f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 393f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 394f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 3951e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 396dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 397dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 398dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 399dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 400dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 401dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 40251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 403f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 404f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 405f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 406f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 407f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 4086c36be5b383875b490684bcf439d6d427298c1afChris Lattner 4091e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 4101e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 4111e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner ImpCastExprToType(Lo, CondType); 4121e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 4131e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner 414b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 415dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 416dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()->isTypeDependent() || 417dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 418dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 419dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 420dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 421f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 422dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } else 423b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 424f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 425f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 426b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 427dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 428dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 429dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 430dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 431dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 432dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 433dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseVals[i].first == CaseVals[i+1].first) { 434dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 435dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 436dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::err_duplicate_case) << CaseVals[i].first.toString(10); 437dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i].second->getLHS()->getLocStart(), 438dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 439dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: We really want to remove the bogus case stmt from 440dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the substmt, but we have no way to do this right now. 441dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 442dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 4436efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 444b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 445dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 446dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 447dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 448dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 449dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 450dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 451dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 4520471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 453dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 454dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 455dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 456dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 457dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 458dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 459dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 460dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 461dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 462dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 463dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 464dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 465dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 466dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 467dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ImpCastExprToType(Hi, CondType); 468dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 469dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 470dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 471dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseRanges[i].first > HiVal) { 472dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 473dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 474dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 475dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 476dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 477dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 478dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 479dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 4800471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 481b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 482dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 483dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 484dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 485dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 486dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 487dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 488dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 489dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 490dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 491dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 492dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 493dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 494dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 495dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 496dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 497dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 498dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 499dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 500dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 501dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 502dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 503dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 504dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 505dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 506dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 507dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 508dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 509dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 510dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 511dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 512dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 513dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 514dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 515dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 516dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 517dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 518dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 519dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 520dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 521dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 522dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 523dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(OverlapStmt->getLHS()->getLocStart(), 524dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 525dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: We really want to remove the bogus case stmt from 526dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the substmt, but we have no way to do this right now. 527dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 528dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5290471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 530b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 531b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 532dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 533dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: If the case list was broken is some way, we don't have a 534dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // good system to patch it up. Instead, just return the whole 535dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // substmt as broken. 536b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 537de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 538de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 539de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 540de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 5415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 543f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 544f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnWhileStmt(SourceLocation WhileLoc, ExprArg Cond, StmtArg Body) { 545e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 5461b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnWhileStmt(): missing expression"); 547f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5484a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor if (!condExpr->isTypeDependent()) { 5494a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor DefaultFunctionArrayConversion(condExpr); 5504a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor Cond = condExpr; 5514a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor QualType condType = condExpr->getType(); 5524a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor 5534a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor if (getLangOptions().CPlusPlus) { 5544a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 5554a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor return StmtError(); 5564a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } else if (!condType->isScalarType()) // C99 6.8.5p2 5574a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor return StmtError(Diag(WhileLoc, 5584a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor diag::err_typecheck_statement_requires_scalar) 5594a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor << condType << condExpr->getSourceRange()); 5604a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } 5615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 562f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 563e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) WhileStmt(condExpr, Body.takeAs<Stmt>(), 5648189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek WhileLoc)); 5655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 567f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 568f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 569f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation WhileLoc, ExprArg Cond) { 570e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 5711b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 572f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5739f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor if (!condExpr->isTypeDependent()) { 5749f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor DefaultFunctionArrayConversion(condExpr); 5759f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor Cond = condExpr; 5769f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor QualType condType = condExpr->getType(); 5779f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor 5789f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor if (getLangOptions().CPlusPlus) { 5799f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 5809f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor return StmtError(); 5819f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } else if (!condType->isScalarType()) // C99 6.8.5p2 5829f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor return StmtError(Diag(DoLoc, 5839f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor diag::err_typecheck_statement_requires_scalar) 5849f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor << condType << condExpr->getSourceRange()); 5859f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } 5865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 587f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 5889f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor return Owned(new (Context) DoStmt(Body.takeAs<Stmt>(), condExpr, DoLoc, 5899f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor WhileLoc)); 5905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 592f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 593f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 594f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, ExprArg third, 595f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 596f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 597f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 598f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Third = static_cast<Expr*>(third.get()); 599f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 600f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6015921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 6025921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 603f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 604f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 605f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 6065921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 6075921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 6085921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 6095921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 6105921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 6115921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 6125921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 6135921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 6145921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 615ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 6165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6175831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor if (Second && !Second->isTypeDependent()) { 61836c4b0ec13453bc003bbac380770b45ae35ef19cChris Lattner DefaultFunctionArrayConversion(Second); 61936c4b0ec13453bc003bbac380770b45ae35ef19cChris Lattner QualType SecondType = Second->getType(); 620f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6215921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 6225921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (CheckCXXBooleanCondition(Second)) // C++ 6.4p4 623f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(); 6245921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else if (!SecondType->isScalarType()) // C99 6.8.5p2 625f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(ForLoc, 626f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_typecheck_statement_requires_scalar) 627f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << SecondType << Second->getSourceRange()); 6285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 629f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 630f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 631f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl third.release(); 632f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 6335831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor return Owned(new (Context) ForStmt(First, Second, Third, Body, ForLoc, 6345831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor LParenLoc, RParenLoc)); 6355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 637f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 638f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 639f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 640f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 641f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 642f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 643f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 644f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 64520552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 64620552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 64720552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 6487e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 649f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 650f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 651f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6527e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 653f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 654f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 655f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 656f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 657248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 658248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 659f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 660f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 6611fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 662810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) 663f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 664f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 665f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 6661fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 667f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl FirstType = static_cast<Expr*>(First)->getType(); 6681fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 669b6ccaac65ca72f72954eb3893bbd940bedd23f00Ted Kremenek if (!Context.isObjCObjectPointerType(FirstType)) 670dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 671d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 6723ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 6733ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian if (Second) { 6743ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian DefaultFunctionArrayConversion(Second); 6753ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 676b6ccaac65ca72f72954eb3893bbd940bedd23f00Ted Kremenek if (!Context.isObjCObjectPointerType(SecondType)) 677dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 678d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 6793ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 680f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 681f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 682f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 6838189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 6848189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 6853ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 6865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6874cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 6881b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 6895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 6904eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If we are in a block, reject all gotos for now. 6914eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 6924cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 6934eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff 6945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 695ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 6965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 697caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 698caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 6998189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 7004cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7018189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 7025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7044cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 705ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 7064cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 707bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 70833083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman Expr* E = DestExp.takeAs<Expr>(); 70933083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman QualType ETy = E->getType(); 71033083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman AssignConvertType ConvTy = 71133083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); 71233083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, 71333083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman E, "passing")) 71433083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman return StmtError(); 715ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris Lattner return Owned(new (Context) IndirectGotoStmt(GotoLoc, E)); 7165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7184cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7191b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 7205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 7215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 7225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 7234cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 7245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7254cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7268189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 7275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7294cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7301b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 7315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 7325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 7335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 7344cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 7355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7364cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7378189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 7385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 74027c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 7414eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 7424cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7434eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 7444eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 7454eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 7464eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType == 0) { 747c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 74816564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 74916564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 75016564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff DefaultFunctionArrayConversion(RetValExp); 7514eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff CurBlock->ReturnType = RetValExp->getType().getTypePtr(); 752c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 7534eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff CurBlock->ReturnType = Context.VoidTy.getTypePtr(); 7544eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 75598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump QualType FnRetType = QualType(CurBlock->ReturnType, 0); 7564cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7576c92fa75e62937f9738696840efcb258560f4568Mike Stump if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 7586c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 7596c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 7606c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 7616c92fa75e62937f9738696840efcb258560f4568Mike Stump } 7626c92fa75e62937f9738696840efcb258560f4568Mike Stump 7634eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 7644eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 7654eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 7664eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 7674eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 7684eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 7698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek RetValExp->Destroy(Context); 7704eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 7714eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7728189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 7734eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7744cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7754cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl if (!RetValExp) 7764cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 7774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 77898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 77998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // we have a non-void block with an expression, continue checking 78098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump QualType RetValType = RetValExp->getType(); 78198eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 78298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 78398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 78498eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // function return. 7854cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 78698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // In C++ the return statement is handled via a copy initialization. 78798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // the C version of which boils down to CheckSingleAssignmentConstraints. 78898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // FIXME: Leaks RetValExp. 78998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 79098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump return StmtError(); 79198eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 79298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 79398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 7944cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7958189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 7964eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 7975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 798e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// IsReturnCopyElidable - Whether returning @p RetExpr from a function that 799e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). 800e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redlstatic bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, 801e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Expr *RetExpr) { 802e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl QualType ExprType = RetExpr->getType(); 803e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with ... 804e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... a class return type ... 805e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!RetType->isRecordType()) 806e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 807e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the same cv-unqualified type as the function return type ... 808e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (Ctx.getCanonicalType(RetType).getUnqualifiedType() != 809e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Ctx.getCanonicalType(ExprType).getUnqualifiedType()) 810e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 811e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the expression is the name of a non-volatile automatic object ... 812e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // We ignore parentheses here. 813e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Is this compliant? 814e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 815e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!DR) 816e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 817e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 818e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!VD) 819e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 820e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return VD->hasLocalStorage() && !VD->getType()->isReferenceType() 821e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl && !VD->getType().isVolatileQualified(); 822e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl} 823e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 8244cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8254cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 826f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *RetValExp = rex.takeAs<Expr>(); 8274eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 8284eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 8294cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 830371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 831f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 832371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 833f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (FD->hasAttr<NoReturnAttr>()) { 834f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump Diag(ReturnLoc, diag::err_noreturn_function_has_return_expr) 835f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 836f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump return StmtError(); 837f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } 838f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 839c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 840c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 841c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 842c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff 8435cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 8443c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (RetValExp) {// C99 6.8.6.4p1 (ext_ since GCC warns) 84565ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 84665ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 84765ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 8484cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 849e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 850e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 851e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 852e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 853e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 854e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 855e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 856e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 8575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8588189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 8595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8604cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 86103d77760a5db7990724b6901cea958a673ce0b39Anders Carlsson if (!RetValExp && !FnRetType->isDependentType()) { 8623c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 8633c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 8643c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 8653c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 8663c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 86708631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 8683c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 86908631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 8708189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); 8713c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner } 8724cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 873898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 874898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // we have a non-void function with an expression, continue checking 8754cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 876898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 877898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 8784cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // function return. 8794cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 880e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p15: When certain criteria are met, an implementation is 881e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // allowed to omit the copy construction of a class object, [...] 882e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with a class return type, when 883e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the expression is the name of a non-volatile automatic object with 884e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the same cv-unqualified type as the function return type, the copy 885e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // operation can be omitted [...] 886e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p16: When the criteria for elision of a copy operation are met 887e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // and the object to be copied is designated by an lvalue, overload 888e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // resolution to select the constructor for the copy is first performed 889e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // as if the object were designated by an rvalue. 890e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // Note that we only compute Elidable if we're in C++0x, since we don't 891e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // care otherwise. 892e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl bool Elidable = getLangOptions().CPlusPlus0x ? 893e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl IsReturnCopyElidable(Context, FnRetType, RetValExp) : 894e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl false; 895e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 896898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // In C++ the return statement is handled via a copy initialization. 8974cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // the C version of which boils down to CheckSingleAssignmentConstraints. 898e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Leaks RetValExp on error. 899e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)) 9004cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 9014cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 902898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 903898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 904898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor 9058189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 908810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 909810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 910810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 911810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 912810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 913810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 914810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 915810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 916810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 917810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 918810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 919810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 920810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 921810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 922810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 923810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 924810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 925810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 926810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 927810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 928810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 929810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 930810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 931810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 932810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 933810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 934810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 935810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 936810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 937810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 9383037ed0a27dba62e522304183718efc149e8b6d9Sebastian RedlSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 9393037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 9403037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 9413037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 9423037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 9433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl std::string *Names, 9443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 9453037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 9463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl ExprArg asmString, 9473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 9483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl SourceLocation RParenLoc) { 9493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 9503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 9513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 9523037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 9533037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 9543037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 9553037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 95603eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 95703eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 9581708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 9596bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 9603037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 9613037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 9623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 9631708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 9641708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 9656bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 9663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 9673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 9683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 969432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner TargetInfo::ConstraintInfo Info(Literal->getStrData(), 9702819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 9712819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 972432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 9733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 974432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 975432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 9763037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 977d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 97872056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 979810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 98072056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 981dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 98272056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 98304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 98403eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 98544def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 98604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 9873037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 988806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 989806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 99004728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 9911708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 9926bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 9933037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 9943037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 9953037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 996432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner TargetInfo::ConstraintInfo Info(Literal->getStrData(), 9972819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 9982819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 9992819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner if (!Context.Target.validateInputConstraint(&OutputConstraintInfos[0], 10002819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 10013037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1002432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1003432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1004d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 10053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 100672056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 10073037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1008d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 100944def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1010810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 101172056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1012d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1013432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 101472056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 101504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 10163037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 101744def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1018d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 101972056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1020d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 1021432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << InputExpr->getType() << Info.getConstraintStr() 102272056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1023d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1024d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 10256032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson 10266032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson DefaultFunctionArrayConversion(Exprs[i]); 102749ac88166d36f8c436780694f2ce955acde87c6aChris Lattner 1028806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 102904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 10303037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10316fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 10321708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 10331708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 10346bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 10353037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 10363037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 10373037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10383037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl llvm::SmallString<16> Clobber(Literal->getStrData(), 10393037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Literal->getStrData() + 10406fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson Literal->getByteLength()); 10413037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10426bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 10433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 10443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl diag::err_asm_unknown_register_name) << Clobber.c_str()); 10456fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 10463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl constraints.release(); 10483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl exprs.release(); 10493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl asmString.release(); 10503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl clobbers.release(); 1051fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1052fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 1053fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Names, Constraints, Exprs, AsmString, NumClobbers, 1054fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Clobbers, RParenLoc); 1055fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1056fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1057fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1058fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1059fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 10602ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 10612ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1062fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1063fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1064fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 1065fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner 1066806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1067806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1068806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 1069806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 1070806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1071806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1072806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1073806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 1074806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 1075806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1076f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1077c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 10787adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 10797adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 10807adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1081806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 1082806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 10837adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // Int/ptr operands have some special cases that we allow. 10847adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if ((OutTy->isIntegerType() || OutTy->isPointerType()) && 10857adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner (InTy->isIntegerType() || InTy->isPointerType())) { 10867adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner 10877adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // They are ok if they are the same size. Tying void* to int is ok if 10887adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // they are the same size, for example. This also allows tying void* to 10897adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // int*. 10903351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 10913351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 10923351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (OutSize == InSize) 1093806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; 1094f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner 10953351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 10963351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // then we can promote it and the asm string won't notice. Check this 1097f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner // case now. 10983351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner bool SmallerValueMentioned = false; 109958bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 110058bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 110158bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner if (!Piece.isOperand()) continue; 11023351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 11033351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 11043351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 11053351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 11063351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize < OutSize) { 11073351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 11083351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 11093351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 11103351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 11113351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 11123351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 11133351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 11143351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == TiedTo) { 11153351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize > OutSize) { 11163351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 11173351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 11183351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 11193351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1120f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 1121f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner 11223351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 11233351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // output was a register, just extend the shorter one to the size of the 11243351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // larger one. 11253351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (!SmallerValueMentioned && 1126f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1127f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner continue; 1128806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 1129806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 1130c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1131806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 11327adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1133806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1134806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1135806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1136806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 1137fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner 1138fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1139fe795956194141c91ae555985c9b930595bff43fChris Lattner} 11403b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1141431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1142431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1143b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner SourceLocation RParen, DeclPtrTy Parm, 1144431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Body, StmtArg catchList) { 1145f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *CatchList = catchList.takeAs<Stmt>(); 1146b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); 1147f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff 1148f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff // PVD == 0 implies @catch(...). 11499d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD) { 115093c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner // If we already know the decl is invalid, reject it. 115193c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner if (PVD->isInvalidDecl()) 115293c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner return StmtError(); 115393c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 11549d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (!Context.isObjCObjectPointerType(PVD->getType())) 11559d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff return StmtError(Diag(PVD->getLocation(), 11569d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff diag::err_catch_param_not_objc_type)); 11579d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD->getType()->isObjCQualifiedIdType()) 11589d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff return StmtError(Diag(PVD->getLocation(), 1159d198abae5938262e501a409e833bf01ca8b8253eSteve Naroff diag::err_illegal_qualifiers_on_catch_parm)); 11609d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff } 116193c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 11628189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, 1163e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson PVD, Body.takeAs<Stmt>(), CatchList); 1164431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl return Owned(CatchList ? CatchList : CS); 11653b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 11663b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1167431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1168431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 11698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 11708189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(Body.release()))); 1171161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1172bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1173431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1174431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 1175431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Try, StmtArg Catch, StmtArg Finally) { 117638c5ebd7b1b65304c7b5c7b9bf3f9162df22e77dChris Lattner CurFunctionNeedsScopeChecking = true; 1177e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), 1178e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Catch.takeAs<Stmt>(), 1179e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Finally.takeAs<Stmt>())); 1180bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1181bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1182431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 11833dcfe10a6801eb52f4c20f1242bea0a3a98aa146Steve NaroffSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { 1184f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *ThrowExpr = expr.takeAs<Expr>(); 11857151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!ThrowExpr) { 1186e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1187e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1188e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1189e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1190e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1191e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 11924ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 11937151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } else { 11947151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff QualType ThrowType = ThrowExpr->getType(); 11957151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff // Make sure the expression type is an ObjC pointer or "void *". 11967151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!Context.isObjCObjectPointerType(ThrowType)) { 11977151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff const PointerType *PT = ThrowType->getAsPointerType(); 11987151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!PT || !PT->getPointeeType()->isVoidType()) 11994ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 12004ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff << ThrowExpr->getType() << ThrowExpr->getSourceRange()); 12017151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 12027151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 12037151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); 120439f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1205bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1206431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1207431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 1208431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg SynchBody) { 120946c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner CurFunctionNeedsScopeChecking = true; 121046c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1211a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 1212a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 1213a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!Context.isObjCObjectPointerType(SyncExpr->getType())) { 1214a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner const PointerType *PT = SyncExpr->getType()->getAsPointerType(); 1215a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1216a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1217a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1218a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 1219a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner 1220e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 1221e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchExpr.takeAs<Stmt>(), 1222e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchBody.takeAs<Stmt>())); 1223fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 12244b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 12254b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 12264b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 12274b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 1228b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris LattnerSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 12294b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 12304b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 12318189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1232b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 1233e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson HandlerBlock.takeAs<Stmt>())); 12344b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 12358351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 12368351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 12378351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 12388351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 12398351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 12408351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 12418351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 12428351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 12438351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 12448351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 12458351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 12468351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl for(unsigned i = 0; i < NumHandlers - 1; ++i) { 12478351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 12488351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl if (!Handler->getExceptionDecl()) 12498351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl return StmtError(Diag(Handler->getLocStart(), diag::err_early_catch_all)); 12508351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 12518351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers for the same type as an earlier one. 12528351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // This one is rather easy. 12538351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 12548351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 12558351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 12568351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 12578351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 12588351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1259972041f45bdf8df7ea447221292d7827466ba94bSebastian Redl CurFunctionNeedsScopeChecking = true; 12608351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 12618189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXTryStmt(TryLoc, 12628189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(TryBlock.release()), 12638189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek Handlers, NumHandlers)); 12648351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1265