SemaStmt.cpp revision 754431107b61a0523df5271c2876a73dd5a051e9
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" 22c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/STLExtras.h" 23c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/SmallVector.h" 245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 266b1d283fe879fb11d7ce7a69feecf66e77b0eaf3Anders CarlssonSema::OwningStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 276b1d283fe879fb11d7ce7a69feecf66e77b0eaf3Anders Carlsson Expr *E = expr->takeAs<Expr>(); 281b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 29a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 30834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 31834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 32834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 33a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 34834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 35a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 39a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 408189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) NullStmt(SemiLoc)); 415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 43682bf92db408a6cbc3d37b5496a99b6ef85041ecChris LattnerSema::OwningStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 44a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 45a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 4620401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 4720401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner 48682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 4920401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 50682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner 5124e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 54636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 55754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 56636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 57636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 58636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 59636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore expressions that have void type. 60636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (E->getType()->isVoidType()) 61636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 62636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 63636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 64636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 65636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E->isUnusedResultAWarning(Loc, R1, R2)) 66636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 67636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 68636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson Diag(Loc, diag::warn_unused_expr) << R1 << R2; 69636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 70636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 71a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlAction::OwningStmtResult 721b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 73a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 74a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 75a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 76c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 77c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 78c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 79c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 80c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 81c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 82c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 83c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 84c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 85c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 86c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 87c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 88c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 89c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 904afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 91c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 92c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 93c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 9498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 9598414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 96636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 97636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 9898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 9998414c1b7d1944a57156d52e29bd41c005de09acChris Lattner 100636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 10198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 102a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 1038189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 1045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 106117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 107117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlSema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, 108117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl SourceLocation DotDotDotLoc, ExprArg rhsval, 10924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 110117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl assert((lhsval.get() != 0) && "missing expression in case statement"); 111117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 11351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // However, GCC allows any evaluatable integer expression. 114117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *LHSVal = static_cast<Expr*>(lhsval.get()); 115dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 116dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 11724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1196c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 120117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 121117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *RHSVal = static_cast<Expr*>(rhsval.get()); 122dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 123dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 124f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 125117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval = 0; 126117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 127117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 128bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 1298a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 13024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1318a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 1325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 133117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl // Only now release the smart pointers. 134117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl lhsval.release(); 135117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval.release(); 136dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 137dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 138bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(CS); 139117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 1405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 14224e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 14324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattnervoid Sema::ActOnCaseStmtBody(StmtTy *caseStmt, StmtArg subStmt) { 14424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 145f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 14624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 14724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 14824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 149117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 1501b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 151117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl StmtArg subStmt, Scope *CurScope) { 152f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 153117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 154bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 1550fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 156117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 1570fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 158117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 159dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 160bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(DS); 161117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 1625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 164de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 1651b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 166de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl SourceLocation ColonLoc, StmtArg subStmt) { 167f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 1685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 169ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[II]; 170de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 172caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 173caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 174de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 176de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 1785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 1795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 18008631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 1815f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 182de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 1835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 184de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 1865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 1875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 1880fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 189de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 1905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 192de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 193a99fad8ff134273fe85f2970c7d89133d1218900Anders CarlssonSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, 194de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ThenVal, SourceLocation ElseLoc, 195de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ElseVal) { 196a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson OwningExprResult CondResult(CondVal.release()); 197a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson 198a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson Expr *condExpr = CondResult.takeAs<Expr>(); 199de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2001b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnIfStmt(): missing expression"); 201de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 202d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor if (!condExpr->isTypeDependent()) { 203d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor DefaultFunctionArrayConversion(condExpr); 204d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor // Take ownership again until we're past the error checking. 205a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson CondResult = condExpr; 206d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor QualType condType = condExpr->getType(); 207d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor 208d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor if (getLangOptions().CPlusPlus) { 209d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 210d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor return StmtError(); 211d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor } else if (!condType->isScalarType()) // C99 6.8.4.1p1 212d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor return StmtError(Diag(IfLoc, 213d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor diag::err_typecheck_statement_requires_scalar) 214d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor << condType << condExpr->getSourceRange()); 215d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor } 216de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 217e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *thenStmt = ThenVal.takeAs<Stmt>(); 218754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 2195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2202d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2212d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2222d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2232d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 224de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl if (!ElseVal.get()) { 2252d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2262d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2272d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2282d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 229754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *elseStmt = ElseVal.takeAs<Stmt>(); 230754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 231754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 232a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson CondResult.release(); 2338189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) IfStmt(IfLoc, condExpr, thenStmt, 234754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson ElseLoc, elseStmt)); 2355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 237de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 238de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnStartOfSwitchStmt(ExprArg cond) { 239f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *Cond = cond.takeAs<Expr>(); 240de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2415921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 2425921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // C++ 6.4.2.p2: 2435921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // The condition shall be of integral type, enumeration type, or of a class 2445921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // type for which a single conversion function to integral or enumeration 2455921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // type exists (12.3). If the condition is of class type, the condition is 2465921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // converted by calling that conversion function, and the result of the 2475921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // conversion is used in place of the original condition for the remainder 2485921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // of this section. Integral promotions are performed. 249dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!Cond->isTypeDependent()) { 250dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor QualType Ty = Cond->getType(); 251dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 252dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: Handle class types. 253dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 254dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the type is wrong a diagnostic will be emitted later at 255dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ActOnFinishSwitchStmt. 256dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Ty->isIntegralType() || Ty->isEnumeralType()) { 257dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Integral promotions are performed. 258dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // FIXME: Integral promotions for C++ are not complete. 259dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor UsualUnaryConversions(Cond); 260dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 2615921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 2625921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else { 2635921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 2645921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis UsualUnaryConversions(Cond); 2655921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 266de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2678189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek SwitchStmt *SS = new (Context) SwitchStmt(Cond); 268bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().push_back(SS); 269de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 270c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson} 2716c36be5b383875b490684bcf439d6d427298c1afChris Lattner 272f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 273f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 274f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 275f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 276f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 277f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner SourceLocation Loc, 278f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 279f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 280f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 281f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 282f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 283f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 284f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 285f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If the input was signed and negative and the output is unsigned, 286f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // warn. 287f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) 288d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 289f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 290f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 291f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 292f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 293f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 294f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 295b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 296f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 297b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 298f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 299d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 300f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 301f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 302f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 303f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 304b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 305f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 306f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 307f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 308f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 309f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 310f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 311f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (Val.isNegative()) // Sign bit changes meaning. 312d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 313f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 314f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 315f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3160471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3170471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3180471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3190471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3200471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3210471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3220e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3230e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3240e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3250e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3260471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3270471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3280471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3290471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3300471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3310471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3320471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 333764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 334764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 335764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 336764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 337764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 338764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 339764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 340764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 341764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 342764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 343764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 344764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 345764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 346764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 347de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 348de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 349de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 350e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *BodyStmt = Body.takeAs<Stmt>(); 351de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 352bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner SwitchStmt *SS = getSwitchStack().back(); 353de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 354de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 3559dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 356bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().pop_back(); 357c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 358f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 359f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner QualType CondType = CondExpr->getType(); 360de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 361dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CondExpr->isTypeDependent() && 362dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor !CondType->isIntegerType()) { // C99 6.8.4.2p1 363d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 364d162584991885ab004a02573a73ce06422b921fcChris Lattner << CondType << CondExpr->getSourceRange(); 365de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 366c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 367de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 368f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 369f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 370dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor bool HasDependentValue 371dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 372dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor unsigned CondWidth 373dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 374dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor : static_cast<unsigned>(Context.getTypeSize(CondType)); 375f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner bool CondIsSigned = CondType->isSignedIntegerType(); 376f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 377f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 378f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 379f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 3800471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 3810471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 382f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 383f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 384f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 385f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 386f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 387c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 388b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 389b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 390dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 391c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 392b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 393c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 394f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 395f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 3965f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 397de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 398f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 399390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 400390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 401390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 402b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 403c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 404f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 405c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 406f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 407f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 408f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 409f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 410f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 4111e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 412dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 413dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 414dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 415dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 416dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 417dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 41851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 419f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 420f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 421f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 422f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 423f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 4246c36be5b383875b490684bcf439d6d427298c1afChris Lattner 4251e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 4261e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 4271e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner ImpCastExprToType(Lo, CondType); 4281e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 4291e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner 430b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 431dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 432dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()->isTypeDependent() || 433dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 434dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 435dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 436dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 437f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 438dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } else 439b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 440f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 441f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 442b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 443dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 444dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 445dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 446dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 447dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 448dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 449dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseVals[i].first == CaseVals[i+1].first) { 450dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 451dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 452dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::err_duplicate_case) << CaseVals[i].first.toString(10); 453dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i].second->getLHS()->getLocStart(), 454dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 455390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 456390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 457dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 458dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 4596efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 460b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 461dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 462dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 463dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 464dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 465dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 466dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 467dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 4680471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 469dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 470dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 471dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 472dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 473dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 474dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 475dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 476dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 477dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 478dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 479dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 480dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 481dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 482dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 483dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ImpCastExprToType(Hi, CondType); 484dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 485dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 486dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 487dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseRanges[i].first > HiVal) { 488dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 489dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 490dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 491dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 492dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 493dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 494dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 495dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 4960471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 497b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 498dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 499dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 500dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 501dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 502dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 503dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 504dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 505dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 506dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 507dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 508dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 509dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 510dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 511dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 512dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 513dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 514dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 515dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 516dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 517dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 518dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 519dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 520dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 521dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 522dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 523dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 524dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 525dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 526dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 527dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 528dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 529dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 530dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 531dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 532dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 533dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 534dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 535dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 536dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 537dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 538dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 539dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(OverlapStmt->getLHS()->getLocStart(), 540dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 541390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 542390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 543dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 544dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5450471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 546b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 547b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 548dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 549390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 550390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 551b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 552de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 553de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 554de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 555de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 5565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 558f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 5597f537c18c7029e73f0bd555be3782c066e7e2c1eAnders CarlssonSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, StmtArg Body) { 5607f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson ExprArg CondArg(Cond.release()); 5617f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson Expr *condExpr = CondArg.takeAs<Expr>(); 5621b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnWhileStmt(): missing expression"); 563f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5644a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor if (!condExpr->isTypeDependent()) { 5654a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor DefaultFunctionArrayConversion(condExpr); 5667f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson CondArg = condExpr; 5674a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor QualType condType = condExpr->getType(); 5684a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor 5694a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor if (getLangOptions().CPlusPlus) { 5704a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 5714a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor return StmtError(); 5724a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } else if (!condType->isScalarType()) // C99 6.8.5p2 5734a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor return StmtError(Diag(WhileLoc, 5744a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor diag::err_typecheck_statement_requires_scalar) 5754a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor << condType << condExpr->getSourceRange()); 5764a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } 5775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 578754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 579754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 580754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 5817f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson CondArg.release(); 582754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) WhileStmt(condExpr, bodyStmt, WhileLoc)); 5835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 585f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 586f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 587989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 588989135901c750af61ef012b6b0a0368be415bc46Chris Lattner ExprArg Cond, SourceLocation CondRParen) { 589e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 5901b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 591f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 5929f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor if (!condExpr->isTypeDependent()) { 5939f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor DefaultFunctionArrayConversion(condExpr); 5949f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor Cond = condExpr; 5959f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor QualType condType = condExpr->getType(); 5969f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor 5979f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor if (getLangOptions().CPlusPlus) { 5989f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 5999f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor return StmtError(); 6009f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } else if (!condType->isScalarType()) // C99 6.8.5p2 6019f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor return StmtError(Diag(DoLoc, 6029f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor diag::err_typecheck_statement_requires_scalar) 6039f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor << condType << condExpr->getSourceRange()); 6049f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } 6055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 606754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 607754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 608754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 609f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 610754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) DoStmt(bodyStmt, condExpr, DoLoc, 611989135901c750af61ef012b6b0a0368be415bc46Chris Lattner WhileLoc, CondRParen)); 6125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 614f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 615f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 616f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, ExprArg third, 617f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 618f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 619f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 620f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Third = static_cast<Expr*>(third.get()); 621f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 622f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6235921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 6245921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 625f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 626f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 627f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 6285921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 6295921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 6305921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 6315921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 6325921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 6335921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 6345921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 6355921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 6365921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 637ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 6385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6395831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor if (Second && !Second->isTypeDependent()) { 64036c4b0ec13453bc003bbac380770b45ae35ef19cChris Lattner DefaultFunctionArrayConversion(Second); 64136c4b0ec13453bc003bbac380770b45ae35ef19cChris Lattner QualType SecondType = Second->getType(); 642f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6435921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (getLangOptions().CPlusPlus) { 6445921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (CheckCXXBooleanCondition(Second)) // C++ 6.4p4 645f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(); 6465921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } else if (!SecondType->isScalarType()) // C99 6.8.5p2 647f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(ForLoc, 648f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_typecheck_statement_requires_scalar) 649f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << SecondType << Second->getSourceRange()); 6505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 651754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 652754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 653754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 654f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 655f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 656f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl third.release(); 657f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 6585831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor return Owned(new (Context) ForStmt(First, Second, Third, Body, ForLoc, 6595831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor LParenLoc, RParenLoc)); 6605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 662f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 663f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 664f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 665f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 666f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 667f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 668f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 669f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 67020552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 67120552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 67220552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 6737e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 674f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 675f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 676f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 6777e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 678f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 679f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 680f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 681f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 682248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 683248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 684f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 685f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 6861fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 687810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) 688f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 689f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 690f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 6911fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 692f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl FirstType = static_cast<Expr*>(First)->getType(); 6931fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 694f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!FirstType->isObjCObjectPointerType()) 695dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 696d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 6973ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 6983ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian if (Second) { 6993ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian DefaultFunctionArrayConversion(Second); 7003ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 701f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 702dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 703d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 7043ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 705f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 706f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 707f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 7088189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 7098189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 7103ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 7115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7124cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7131b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 7145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 7154eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If we are in a block, reject all gotos for now. 7164eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 7174cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 7184eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff 7195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 720ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 7215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 722caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 723caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 7248189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 7254cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7268189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 7275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7294cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 730ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 7314cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 732bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 73333083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman Expr* E = DestExp.takeAs<Expr>(); 7345f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 7355f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 7365f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 7375f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); 7385f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, 7395f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor E, "passing")) 7405f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 7415f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 7425f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 7435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7454cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7461b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 7475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 7485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 7495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 7504cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 7515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7524cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7538189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 7545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7564cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7571b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 7585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 7595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 7605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 7614cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 7625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7634cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 7648189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 7655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 76727c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 7684eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 7694cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 7704eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 7714eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 7724eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 7737d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 774c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 77516564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 77616564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 77716564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff DefaultFunctionArrayConversion(RetValExp); 7787d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 7797d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 7807d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 7817d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 7827d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 7837d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 7847d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 7857d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 786c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 7877d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 7884eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 7897d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 7904cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 79140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 7926c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 7936c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 7946c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 7956c92fa75e62937f9738696840efcb258560f4568Mike Stump } 7966c92fa75e62937f9738696840efcb258560f4568Mike Stump 7974eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 7984eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 7994eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 8004eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 8014eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 8024eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 8038189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek RetValExp->Destroy(Context); 8044eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 8054eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 8068189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 8074eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 8084cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8094cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl if (!RetValExp) 8104cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 8114cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 81298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 81398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // we have a non-void block with an expression, continue checking 81498eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump QualType RetValType = RetValExp->getType(); 81598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 81698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 81798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 81898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // function return. 8194cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 82098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // In C++ the return statement is handled via a copy initialization. 82198eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // the C version of which boils down to CheckSingleAssignmentConstraints. 82298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // FIXME: Leaks RetValExp. 82398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 82498eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump return StmtError(); 82598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 82698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 82798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 8284cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8298189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 8304eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 8315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 832e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// IsReturnCopyElidable - Whether returning @p RetExpr from a function that 833e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). 834e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redlstatic bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, 835e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Expr *RetExpr) { 836e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl QualType ExprType = RetExpr->getType(); 837e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with ... 838e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... a class return type ... 839e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!RetType->isRecordType()) 840e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 841e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the same cv-unqualified type as the function return type ... 842e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (Ctx.getCanonicalType(RetType).getUnqualifiedType() != 843e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Ctx.getCanonicalType(ExprType).getUnqualifiedType()) 844e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 845e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the expression is the name of a non-volatile automatic object ... 846e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // We ignore parentheses here. 847e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Is this compliant? 848e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 849e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!DR) 850e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 851e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 852e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!VD) 853e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 854e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return VD->hasLocalStorage() && !VD->getType()->isReferenceType() 855e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl && !VD->getType().isVolatileQualified(); 856e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl} 857e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 8584cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 859a0ab25d2808fe77ffff54f25a015893791dfd4b6Anders CarlssonSema::ActOnReturnStmt(SourceLocation ReturnLoc, FullExprArg rex) { 860a0ab25d2808fe77ffff54f25a015893791dfd4b6Anders Carlsson Expr *RetValExp = rex->takeAs<Expr>(); 8614eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 8624eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 8634cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 864371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 865f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 866371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 86740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (FD->hasAttr<NoReturnAttr>()) 8688662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 869f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 870f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 871c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 872c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 873c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 874c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff 8755cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 8763c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (RetValExp) {// C99 6.8.6.4p1 (ext_ since GCC warns) 87765ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 87865ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 87965ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 8804cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 881e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 882e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 883e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 884e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 885e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 886e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 887e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 888e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 8895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8908189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 8915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8924cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 89303d77760a5db7990724b6901cea958a673ce0b39Anders Carlsson if (!RetValExp && !FnRetType->isDependentType()) { 8943c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 8953c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 8963c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 8973c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 8983c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 89908631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 9003c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 90108631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 9028189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); 9033c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner } 9044cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 905898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 906898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // we have a non-void function with an expression, continue checking 9074cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 908898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 909898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 9104cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // function return. 9114cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 912e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p15: When certain criteria are met, an implementation is 913e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // allowed to omit the copy construction of a class object, [...] 914e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with a class return type, when 915e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the expression is the name of a non-volatile automatic object with 916e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the same cv-unqualified type as the function return type, the copy 917e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // operation can be omitted [...] 918e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p16: When the criteria for elision of a copy operation are met 919e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // and the object to be copied is designated by an lvalue, overload 920e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // resolution to select the constructor for the copy is first performed 921e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // as if the object were designated by an rvalue. 922e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // Note that we only compute Elidable if we're in C++0x, since we don't 923e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // care otherwise. 924e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl bool Elidable = getLangOptions().CPlusPlus0x ? 925e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl IsReturnCopyElidable(Context, FnRetType, RetValExp) : 926e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl false; 927e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 928898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // In C++ the return statement is handled via a copy initialization. 9294cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // the C version of which boils down to CheckSingleAssignmentConstraints. 930e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Leaks RetValExp on error. 931e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)) 9324cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 9334cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 934898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 935898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 936898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor 9378189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 940810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 941810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 942810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 943810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 944810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 945810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 946810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 947810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 948810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 949810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 950810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 951810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 952810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 953810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 954810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 955810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 956810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 957810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 958810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 959810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 960810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 961810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 962810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 963810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 964810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 965810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 966810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 967810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 968810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 969810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 9703037ed0a27dba62e522304183718efc149e8b6d9Sebastian RedlSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 9713037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 9723037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 9733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 9743037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 9753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl std::string *Names, 9763037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 9773037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 9783037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl ExprArg asmString, 9793037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 9803037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl SourceLocation RParenLoc) { 9813037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 9823037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 9833037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 9843037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 9853037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 9863037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 9873037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 98803eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 98903eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 9901708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 9916bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 9923037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 9933037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 9943037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 9951708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 9961708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 9976bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 9983037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 9993037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 10003037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1001432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner TargetInfo::ConstraintInfo Info(Literal->getStrData(), 10022819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 10032819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1004432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 10053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1006432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1007432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 10083037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1009d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 101072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1011810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 101272056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1013dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 101472056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 101504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 101603eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 101744def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 101804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 10193037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1020806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1021806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 102204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 10231708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 10246bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 10253037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 10263037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 10273037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1028432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner TargetInfo::ConstraintInfo Info(Literal->getStrData(), 10292819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 10302819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1031beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 10322819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 10333037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1034432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1035432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1036d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 10373037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 103872056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 10393037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1040d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 104144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1042810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 104372056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1044d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1045432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 104672056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 104704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 10483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 104944def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1050d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 105172056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1052d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 1053432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << InputExpr->getType() << Info.getConstraintStr() 105472056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1055d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1056d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 10576032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson 10586032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson DefaultFunctionArrayConversion(Exprs[i]); 105949ac88166d36f8c436780694f2ce955acde87c6aChris Lattner 1060806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 106104728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 10623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10636fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 10641708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 10651708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 10666bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 10673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 10683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 10693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10703037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl llvm::SmallString<16> Clobber(Literal->getStrData(), 10713037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Literal->getStrData() + 10726fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson Literal->getByteLength()); 10733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10746bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 10753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 10763037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl diag::err_asm_unknown_register_name) << Clobber.c_str()); 10776fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 10783037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 10793037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl constraints.release(); 10803037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl exprs.release(); 10813037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl asmString.release(); 10823037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl clobbers.release(); 1083fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1084fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 1085fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Names, Constraints, Exprs, AsmString, NumClobbers, 1086fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Clobbers, RParenLoc); 1087fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1088fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1089fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1090fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1091fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 10922ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 10932ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1094fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1095fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1096fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 1097fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner 1098806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1099806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1100806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 1101806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 1102806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1103806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1104806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1105806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 1106806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 1107806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1108f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1109c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 11107adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 11117adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 11127adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1113806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 1114806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 11157adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // Int/ptr operands have some special cases that we allow. 11167adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if ((OutTy->isIntegerType() || OutTy->isPointerType()) && 11177adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner (InTy->isIntegerType() || InTy->isPointerType())) { 11187adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner 11197adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // They are ok if they are the same size. Tying void* to int is ok if 11207adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // they are the same size, for example. This also allows tying void* to 11217adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // int*. 11223351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 11233351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 11243351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (OutSize == InSize) 1125806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; 1126f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner 11273351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 11283351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // then we can promote it and the asm string won't notice. Check this 1129f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner // case now. 11303351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner bool SmallerValueMentioned = false; 113158bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 113258bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 113358bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner if (!Piece.isOperand()) continue; 11343351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 11353351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 11363351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 11373351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 11383351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize < OutSize) { 11393351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 11403351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 11413351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 11423351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 11433351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 11443351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 11453351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 11463351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == TiedTo) { 11473351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize > OutSize) { 11483351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 11493351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 11503351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 11513351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1152f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 1153f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner 11543351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 11553351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // output was a register, just extend the shorter one to the size of the 11563351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // larger one. 11573351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (!SmallerValueMentioned && 1158f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1159f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner continue; 1160806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 1161806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 1162c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1163806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 11647adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1165806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1166806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1167806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1168806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 1169fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner 1170fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1171fe795956194141c91ae555985c9b930595bff43fChris Lattner} 11723b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1173431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1174431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1175b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner SourceLocation RParen, DeclPtrTy Parm, 1176431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Body, StmtArg catchList) { 1177f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *CatchList = catchList.takeAs<Stmt>(); 1178b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); 1179f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff 1180f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff // PVD == 0 implies @catch(...). 11819d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD) { 118293c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner // If we already know the decl is invalid, reject it. 118393c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner if (PVD->isInvalidDecl()) 118493c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner return StmtError(); 118593c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 1186f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!PVD->getType()->isObjCObjectPointerType()) 11879d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff return StmtError(Diag(PVD->getLocation(), 11889d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff diag::err_catch_param_not_objc_type)); 11899d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD->getType()->isObjCQualifiedIdType()) 11909d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff return StmtError(Diag(PVD->getLocation(), 1191d198abae5938262e501a409e833bf01ca8b8253eSteve Naroff diag::err_illegal_qualifiers_on_catch_parm)); 11929d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff } 119393c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 11948189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, 1195e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson PVD, Body.takeAs<Stmt>(), CatchList); 1196431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl return Owned(CatchList ? CatchList : CS); 11973b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 11983b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1199431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1200431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 12018189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 12028189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(Body.release()))); 1203161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1204bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1205431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1206431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 1207431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Try, StmtArg Catch, StmtArg Finally) { 120838c5ebd7b1b65304c7b5c7b9bf3f9162df22e77dChris Lattner CurFunctionNeedsScopeChecking = true; 1209e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), 1210e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Catch.takeAs<Stmt>(), 1211e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Finally.takeAs<Stmt>())); 1212bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1213bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1214431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 12153dcfe10a6801eb52f4c20f1242bea0a3a98aa146Steve NaroffSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { 1216f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *ThrowExpr = expr.takeAs<Expr>(); 12177151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!ThrowExpr) { 1218e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1219e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1220e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1221e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1222e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1223e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 12244ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 12257151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } else { 12267151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff QualType ThrowType = ThrowExpr->getType(); 12277151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff // Make sure the expression type is an ObjC pointer or "void *". 1228f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!ThrowType->isObjCObjectPointerType()) { 12296217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = ThrowType->getAs<PointerType>(); 12307151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!PT || !PT->getPointeeType()->isVoidType()) 12314ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 12324ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff << ThrowExpr->getType() << ThrowExpr->getSourceRange()); 12337151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 12347151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 12357151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); 123639f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1237bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1238431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1239431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 1240431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg SynchBody) { 124146c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner CurFunctionNeedsScopeChecking = true; 124246c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1243a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 1244a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 1245f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SyncExpr->getType()->isObjCObjectPointerType()) { 12466217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1247a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1248a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1249a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1250a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 1251a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner 1252e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 1253e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchExpr.takeAs<Stmt>(), 1254e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchBody.takeAs<Stmt>())); 1255fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 12564b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 12574b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 12584b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 12594b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 1260b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris LattnerSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 12614b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 12624b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 12638189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1264b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 1265e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson HandlerBlock.takeAs<Stmt>())); 12664b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 12678351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1268c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1269c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1270c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1271c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1272c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1273c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1274c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1275c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 1276c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (t.getTypePtr() < y.t.getTypePtr()) 1277c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 1278c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else if (t.getTypePtr() > y.t.getTypePtr()) 1279c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1280c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else if (t.getCVRQualifiers() < y.t.getCVRQualifiers()) 1281c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 1282c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else if (t.getCVRQualifiers() < y.t.getCVRQualifiers()) 1283c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1284c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1285c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1286c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1287c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1288c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 1289c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return t.getTypePtr() == other.t.getTypePtr() 1290c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl && t.getCVRQualifiers() == other.t.getCVRQualifiers(); 1291c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1292c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1293c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType getQualType() const { return t; } 1294c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1295c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1296c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1297c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1298c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1299c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 13008351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 13018351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 13028351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 13038351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 13048351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 13058351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 13068351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 13078351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 13088351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 13098351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1310c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 1311c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1312c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for(unsigned i = 0; i < NumHandlers; ++i) { 13138351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1314c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1315c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1316c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1317c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 1318c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1319c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1320c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1321c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1322c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1323c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1324c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1325c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1326c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1327c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1328c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1329c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 1330c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1331c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1332c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1333c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 1334c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1335c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1336c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1337c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1338c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1339c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1340c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1341c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1342c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1343c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1344c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1345c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 13468351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 1347c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 13488351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 13498351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 13508351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 13518351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 13528351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 13538351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1354972041f45bdf8df7ea447221292d7827466ba94bSebastian Redl CurFunctionNeedsScopeChecking = true; 13558351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 13568189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXTryStmt(TryLoc, 13578189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(TryBlock.release()), 13588189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek Handlers, NumHandlers)); 13598351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1360