SemaStmt.cpp revision 8cfe5a784133d90bf329fd20801824a6f71bb8ca
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" 1884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/AST/ExprCXX.h" 19419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner#include "clang/AST/ExprObjC.h" 2016f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtObjC.h" 2116f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtCXX.h" 2284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/Lex/Preprocessor.h" 236fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 24c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/STLExtras.h" 25c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/SmallVector.h" 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 286b1d283fe879fb11d7ce7a69feecf66e77b0eaf3Anders CarlssonSema::OwningStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 296b1d283fe879fb11d7ce7a69feecf66e77b0eaf3Anders Carlsson Expr *E = expr->takeAs<Expr>(); 301b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 3116b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian if (E->getType()->isObjCInterfaceType()) { 3216b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian if (LangOpts.ObjCNonFragileABI) 3316b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian Diag(E->getLocEnd(), diag::err_indirection_requires_nonfragile_object) 3416b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian << E->getType(); 3516b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian else 3616b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian Diag(E->getLocEnd(), diag::err_direct_interface_unsupported) 3716b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian << E->getType(); 3816b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian return StmtError(); 3916b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian } 40834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 41834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 42834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 43a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 44834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 45a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 49a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 508189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) NullStmt(SemiLoc)); 515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 53682bf92db408a6cbc3d37b5496a99b6ef85041ecChris LattnerSema::OwningStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 54a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 55a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 5620401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 58682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 5920401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6124e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 64a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanianvoid Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { 65a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 66a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 67a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // If we have an invalid decl, just return. 68a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian if (DG.isNull() || !DG.isSingleDecl()) return; 69a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // suppress any potential 'unused variable' warning. 70a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DG.getSingleDecl()->setUsed(); 71a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian} 72a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 73636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 74754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 75636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 76636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 77636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 78636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore expressions that have void type. 79636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (E->getType()->isVoidType()) 80636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 82636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 83636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 84df317bf71653eeb235da8337b1e8e790f9653aa4Mike Stump if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) 85636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 87419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 88419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 89419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 90419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 91419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner E = E->IgnoreParens(); 9209105f52b1f28cbb1374c27c3c70f5517e2c465dFariborz Jahanian if (isa<ObjCImplicitSetterGetterRefExpr>(E)) 93419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner DiagID = diag::warn_unused_property_expr; 94bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner 95bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 96bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 97bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 98bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const FunctionDecl *FD = CE->getDirectCallee()) { 99bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 100bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 101bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 102bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 103bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 104bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 105bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 106bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 107bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 108bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 109bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 110bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 111bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 112bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 1131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 114419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner Diag(Loc, DiagID) << R1 << R2; 115636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 116636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 117a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlAction::OwningStmtResult 1181b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 119a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 120a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 121a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 122c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 123c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 124c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 125c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 126c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 127c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 128c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 129c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 130c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 131c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 132c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 133c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 1341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 135c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 1364afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 137c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 138c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 139c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 14098414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 14198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 142636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 143636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 14498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 1451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 146636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 14798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 148a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 1498189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 1505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 152117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 153117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlSema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, 154117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl SourceLocation DotDotDotLoc, ExprArg rhsval, 15524e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 156117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl assert((lhsval.get() != 0) && "missing expression in case statement"); 157117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 1591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // However, GCC allows any evaluatable integer expression. 160117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *LHSVal = static_cast<Expr*>(lhsval.get()); 1611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 162dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 16324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1656c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 166117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 167117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *RHSVal = static_cast<Expr*>(rhsval.get()); 168dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 169dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 170f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 171117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval = 0; 172117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 173117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 174bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 1758a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 17624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1778a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 1785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 179117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl // Only now release the smart pointers. 180117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl lhsval.release(); 181117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval.release(); 182dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 183dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 184bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(CS); 185117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 1865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 18824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 18924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattnervoid Sema::ActOnCaseStmtBody(StmtTy *caseStmt, StmtArg subStmt) { 19024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 191f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 19224e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 19324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 19424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 195117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 1961eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 197117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl StmtArg subStmt, Scope *CurScope) { 198f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 199117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 200bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 2010fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 202117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 2030fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 204117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 205dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 206bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(DS); 207117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 2085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 210de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 2111b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 212de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl SourceLocation ColonLoc, StmtArg subStmt) { 213f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 2145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 215ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[II]; 216de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 218caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 219caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 220de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 222de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 2245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 2255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 22608631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 2275f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 228de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 2295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 230de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 2325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 2335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 2340fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 235de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 2365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 238de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 239a99fad8ff134273fe85f2970c7d89133d1218900Anders CarlssonSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, 240de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ThenVal, SourceLocation ElseLoc, 241de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ElseVal) { 242a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson OwningExprResult CondResult(CondVal.release()); 2431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 244a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson Expr *condExpr = CondResult.takeAs<Expr>(); 2451b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnIfStmt(): missing expression"); 2468cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor 2478cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 2488cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor if (CXXConditionDeclExpr *Cond = dyn_cast<CXXConditionDeclExpr>(condExpr)) { 2498cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor ConditionVar = Cond->getVarDecl(); 2508cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor condExpr = DeclRefExpr::Create(Context, 0, SourceRange(), ConditionVar, 2518cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor ConditionVar->getLocation(), 2528cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor ConditionVar->getType().getNonReferenceType()); 2538cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor // FIXME: Leaks the old condExpr 2548cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 2558cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor 2565a881bb09928b7ade891efc680088aaad276f8d6John McCall if (CheckBooleanCondition(condExpr, IfLoc)) { 257a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson CondResult = condExpr; 2585a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 259d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor } 260de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 261e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *thenStmt = ThenVal.takeAs<Stmt>(); 262754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 2635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2642d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2652d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2662d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2672d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 2681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!ElseVal.get()) { 2692d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2702d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2712d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2722d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 273754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *elseStmt = ElseVal.takeAs<Stmt>(); 274754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 2751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 276a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson CondResult.release(); 2778cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor return Owned(new (Context) IfStmt(IfLoc, ConditionVar, condExpr, thenStmt, 278754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson ElseLoc, elseStmt)); 2795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 281de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 282de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnStartOfSwitchStmt(ExprArg cond) { 28384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SwitchStmt *SS = new (Context) SwitchStmt(cond.takeAs<Expr>()); 284bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().push_back(SS); 285de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 286c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson} 2876c36be5b383875b490684bcf439d6d427298c1afChris Lattner 288f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 289f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 290f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 291f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 292f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 2931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 294f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 295f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 296f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 297f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 298f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 299f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 3001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 301f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If the input was signed and negative and the output is unsigned, 302f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // warn. 303f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) 304d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 3051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 306f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 307f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 308f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 309f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 310f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 311b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 312f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 313b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 314f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 315d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 3161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 317f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 318f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 319f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 320b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 321f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 322f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 323f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 324f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 325f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 3261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 327f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (Val.isNegative()) // Sign bit changes meaning. 328d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 329f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 330f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 331f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3320471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3330471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3340471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3350471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3360471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3370471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3380e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3390e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3400e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3410e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3420471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3430471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3440471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3450471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3460471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3470471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3480471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 349764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 350764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 351764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 352764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 353764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 354764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 355764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 356764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 357764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 358764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 359764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 360764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 361764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 362764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 3635f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 3645f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 3655f04881eb025f61396d0555d8173730fe2759e0aChris Lattnerstatic QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { 3665f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const ImplicitCastExpr *ImplicitCast = 3675f04881eb025f61396d0555d8173730fe2759e0aChris Lattner dyn_cast_or_null<ImplicitCastExpr>(expr); 3685f04881eb025f61396d0555d8173730fe2759e0aChris Lattner if (ImplicitCast != NULL) { 3695f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); 3705f04881eb025f61396d0555d8173730fe2759e0aChris Lattner QualType TypeBeforePromotion = ExprBeforePromotion->getType(); 3715f04881eb025f61396d0555d8173730fe2759e0aChris Lattner if (TypeBeforePromotion->isIntegralType()) { 3725f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return TypeBeforePromotion; 3735f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3745f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3755f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 3765f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 3775f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 378de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 379de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 380de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 381e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *BodyStmt = Body.takeAs<Stmt>(); 382de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 383bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner SwitchStmt *SS = getSwitchStack().back(); 384de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 385de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 3869dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 3871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getSwitchStack().pop_back(); 388c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 389f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 39084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType CondTypeBeforePromotion = 39184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor GetTypeBeforeIntegralPromotion(CondExpr); 392f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner QualType CondType = CondExpr->getType(); 393de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 39484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (getLangOptions().CPlusPlus) { 39584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // C++ 6.4.2.p2: 39684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // The condition shall be of integral type, enumeration type, or of a class 39784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // type for which a single conversion function to integral or enumeration 39884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // type exists (12.3). If the condition is of class type, the condition is 39984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // converted by calling that conversion function, and the result of the 40084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // conversion is used in place of the original condition for the remainder 40184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // of this section. Integral promotions are performed. 40284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (!CondExpr->isTypeDependent()) { 403f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor // Make sure that the condition expression has a complete type, 404f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor // otherwise we'll never find any conversions. 405f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor if (RequireCompleteType(SwitchLoc, CondType, 406f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 407f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor << CondExpr->getSourceRange())) 408f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor return StmtError(); 409f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor 41084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor llvm::SmallVector<CXXConversionDecl *, 4> ViableConversions; 41184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor llvm::SmallVector<CXXConversionDecl *, 4> ExplicitConversions; 41284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (const RecordType *RecordTy = CondType->getAs<RecordType>()) { 41384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor const UnresolvedSet *Conversions 41484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor = cast<CXXRecordDecl>(RecordTy->getDecl()) 41584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ->getVisibleConversionFunctions(); 41684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor for (UnresolvedSet::iterator I = Conversions->begin(), 41784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor E = Conversions->end(); I != E; ++I) { 41884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(*I)) 41984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (Conversion->getConversionType().getNonReferenceType() 42084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ->isIntegralType()) { 42184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (Conversion->isExplicit()) 42284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ExplicitConversions.push_back(Conversion); 42384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor else 42484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ViableConversions.push_back(Conversion); 42584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 42684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 42784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 42884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor switch (ViableConversions.size()) { 42984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor case 0: 43084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (ExplicitConversions.size() == 1) { 43184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // The user probably meant to invoke the given explicit 43284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // conversion; use it. 43384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType ConvTy 43484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor = ExplicitConversions[0]->getConversionType() 43584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor .getNonReferenceType(); 43684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor std::string TypeStr; 43784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ConvTy.getAsStringInternal(TypeStr, Context.PrintingPolicy); 43884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 43984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 44084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(SwitchLoc, diag::err_switch_explicit_conversion) 44184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CondType << ConvTy << CondExpr->getSourceRange() 44284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CodeModificationHint::CreateInsertion(CondExpr->getLocStart(), 44384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor "static_cast<" + TypeStr + ">(") 44484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CodeModificationHint::CreateInsertion( 44584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor PP.getLocForEndOfToken(CondExpr->getLocEnd()), 44684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ")"); 44784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(ExplicitConversions[0]->getLocation(), 44884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor diag::note_switch_conversion) 44984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 45084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 45184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // If we aren't in a SFINAE context, build a call to the 45284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // explicit conversion function. 45384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (!isSFINAEContext()) 45484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondExpr = BuildCXXMemberCallExpr(CondExpr, 45584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ExplicitConversions[0]); 45684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 45784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 45884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // We'll complain below about a non-integral condition type. 45984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor break; 46084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 46184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor case 1: 46284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // Apply this conversion. 46384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondExpr = BuildCXXMemberCallExpr(CondExpr, ViableConversions[0]); 46484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor break; 46584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 46684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor default: 46784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(SwitchLoc, diag::err_switch_multiple_conversions) 46884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CondType << CondExpr->getSourceRange(); 46984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor for (unsigned I = 0, N = ViableConversions.size(); I != N; ++I) { 47084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType ConvTy 47184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor = ViableConversions[I]->getConversionType() 47284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor .getNonReferenceType(); 47384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(ViableConversions[I]->getLocation(), 47484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor diag::note_switch_conversion) 47584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 47684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 47784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor return StmtError(); 47884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 47984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 48084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondType = CondExpr->getType(); 48184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 48284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (CondType->isIntegralType() || CondType->isEnumeralType()) { 48384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // Integral promotions are performed. 48484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor UsualUnaryConversions(CondExpr); 48584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 48684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 48784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } else { 48884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 48984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor UsualUnaryConversions(CondExpr); 49084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 49184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondType = CondExpr->getType(); 49284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SS->setCond(CondExpr); 49384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 4945f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 4955f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 4965f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 4975f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 4985f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 4995f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 5005f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 50112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 50212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondType->isIntegerType()) { // C99 6.8.4.2p1 50312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 50412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondType << CondExpr->getSourceRange(); 50512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 50612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 50712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 50812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (CondTypeBeforePromotion->isBooleanType()) { 50912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 51012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 51112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 51212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 51312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 51412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 515c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 516de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 517f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 518f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 5191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 520dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 5211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 522dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 5235f04881eb025f61396d0555d8173730fe2759e0aChris Lattner : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); 5245f04881eb025f61396d0555d8173730fe2759e0aChris Lattner bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); 5251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 526f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 527f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 528f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 5290471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 5300471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 5311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 532f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 533f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 5341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 535f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 5361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 537b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 5381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 539dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 540c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 5411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 542c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 543f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 544f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 5455f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 546de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 547f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 548390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 549390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 550390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 551b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 552c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 553f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 5541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 555f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 556f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 5571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 558f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 559f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 5601e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 561dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 562dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 563dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 564dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 565dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56751fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 5681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 569f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 570f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 571f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 572f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 5736c36be5b383875b490684bcf439d6d427298c1afChris Lattner 5741e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 5751e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 57673c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Lo, CondType, CastExpr::CK_IntegralCast); 5771e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 5781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 579b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 580dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 5811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 582dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 583dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 584dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 585dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 586f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 5871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 588b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 589f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 590f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 591b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 592dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 593dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 594dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 595dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 596dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 597dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 598dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseVals[i].first == CaseVals[i+1].first) { 599dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 600dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 601dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::err_duplicate_case) << CaseVals[i].first.toString(10); 6021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 603dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 604390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 605390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 606dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 607dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6086efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 609b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 6101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 611dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 612dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 613dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 614dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 615dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 616dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 6171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 618dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 619dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 620dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 621dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 622dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 623dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 6241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 625dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 626dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 627dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 628dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 6291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 630dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 631dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 63273c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Hi, CondType, CastExpr::CK_IntegralCast); 633dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 6341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 635dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 636dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseRanges[i].first > HiVal) { 637dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 638dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 640dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 641dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 642dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 643dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 644dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 6450471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 6461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 647dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 648dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 649dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 650dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 651dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 652dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 653dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 6541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 655dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 656dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 657dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 658dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 6591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 660dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 661dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 662dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 663dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 664dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 665dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 666dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 667dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 668dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 670dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 671dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 672dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 675dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 677dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 679dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 680dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 682dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 684dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 685dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 686dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 687dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 6881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 689dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 690390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 691390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 692dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 693dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6940471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 695b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 696b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 697dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 698390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 699390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 700b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 701de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 702de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 703de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 704de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 7055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 707f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 7087f537c18c7029e73f0bd555be3782c066e7e2c1eAnders CarlssonSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, StmtArg Body) { 7097f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson ExprArg CondArg(Cond.release()); 7107f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson Expr *condExpr = CondArg.takeAs<Expr>(); 7111b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnWhileStmt(): missing expression"); 712f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7135a881bb09928b7ade891efc680088aaad276f8d6John McCall if (CheckBooleanCondition(condExpr, WhileLoc)) { 7147f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson CondArg = condExpr; 7155a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7164a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } 7175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 718754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 719754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 7201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7217f537c18c7029e73f0bd555be3782c066e7e2c1eAnders Carlsson CondArg.release(); 722754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) WhileStmt(condExpr, bodyStmt, WhileLoc)); 7235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 725f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 726f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 727989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 728989135901c750af61ef012b6b0a0368be415bc46Chris Lattner ExprArg Cond, SourceLocation CondRParen) { 729e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 7301b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 731f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7325a881bb09928b7ade891efc680088aaad276f8d6John McCall if (CheckBooleanCondition(condExpr, DoLoc)) { 7339f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor Cond = condExpr; 7345a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7359f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } 7365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 737754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 738754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 739754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 740f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 741754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) DoStmt(bodyStmt, condExpr, DoLoc, 742989135901c750af61ef012b6b0a0368be415bc46Chris Lattner WhileLoc, CondRParen)); 7435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 745f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 746f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 747f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, ExprArg third, 748f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 749f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 7505a881bb09928b7ade891efc680088aaad276f8d6John McCall Expr *Second = second.takeAs<Expr>(); 751f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Third = static_cast<Expr*>(third.get()); 752f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 753f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7545921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 7555921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 756f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 757f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 758f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 7595921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 7605921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 7615921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 7625921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 7635921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 7645921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 7655921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 7665921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 7675921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 768ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 7695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7705a881bb09928b7ade891efc680088aaad276f8d6John McCall if (Second && CheckBooleanCondition(Second, ForLoc)) { 7715a881bb09928b7ade891efc680088aaad276f8d6John McCall second = Second; 7725a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7753af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 7763af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 777754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 778754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 779f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 780f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl third.release(); 781f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 7825831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor return Owned(new (Context) ForStmt(First, Second, Third, Body, ForLoc, 7835831c6a1efc47e6a19d82fe3dd25b5b8fef6979dDouglas Gregor LParenLoc, RParenLoc)); 7845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 786f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 787f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 788f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 789f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 790f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 791f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 792f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 793f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 79420552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 79520552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 79620552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 7977e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 798f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 799f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 800f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8017e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 802f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 803f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 804f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 805f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 806248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 807248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 808f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 809f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 8101fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 811810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) 812f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 813f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 814f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 8151fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 8161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 8171fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 8181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!FirstType->isObjCObjectPointerType() && 819a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 820dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 821d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 8223ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 8233ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian if (Second) { 8243ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian DefaultFunctionArrayConversion(Second); 8253ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 826f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 827dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 828d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 8293ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 830f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 831f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 832f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 8338189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 8348189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 8353ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 8365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8374cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8381b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 8395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 8404eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If we are in a block, reject all gotos for now. 8414eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 8424cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 8434eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff 8445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 845ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 8465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 847caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 848caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 8498189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 8504cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8518189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 8525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8544cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 855ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 8564cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 857bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 85833083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman Expr* E = DestExp.takeAs<Expr>(); 8595f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 8605f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 8615f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 8625f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); 8635f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, 8645f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor E, "passing")) 8655f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 8665f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 8675f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 8685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8704cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8711b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 8725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 8735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 8745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 8754cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 8765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8788189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 8795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8814cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8821b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 8835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 8845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 8855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 8864cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 8875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8884cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8898189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 8905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 89227c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 8934eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 8944cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8954eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 8964eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 8974eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 8987d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 899c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 90016564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 90116564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 90216564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff DefaultFunctionArrayConversion(RetValExp); 9037d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 9047d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 9057d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 9067d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 9077d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 9087d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 9097d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 9107d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 911c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 9127d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 9134eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9147d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 9154cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 91640b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 9176c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 9186c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 9196c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 9206c92fa75e62937f9738696840efcb258560f4568Mike Stump } 9216c92fa75e62937f9738696840efcb258560f4568Mike Stump 9224eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 9234eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 9244eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 9254eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 9264eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 9274eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 9288189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek RetValExp->Destroy(Context); 9294eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 9304eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9318189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9324eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9334cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9344cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl if (!RetValExp) 9354cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 9364cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 93798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 93898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // we have a non-void block with an expression, continue checking 93998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump QualType RetValType = RetValExp->getType(); 94098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 9411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 9421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 94398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // function return. 9444cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 94598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // In C++ the return statement is handled via a copy initialization. 94698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // the C version of which boils down to CheckSingleAssignmentConstraints. 94798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // FIXME: Leaks RetValExp. 94898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 94998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump return StmtError(); 95098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 95198eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 95298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 9534cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9548189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9554eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 9565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 957e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// IsReturnCopyElidable - Whether returning @p RetExpr from a function that 958e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). 959e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redlstatic bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, 960e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Expr *RetExpr) { 961e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl QualType ExprType = RetExpr->getType(); 962e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with ... 963e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... a class return type ... 964e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!RetType->isRecordType()) 965e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 966e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the same cv-unqualified type as the function return type ... 967a4923eb7c4b04d360cb2747641a5e92818edf804Douglas Gregor if (!Ctx.hasSameUnqualifiedType(RetType, ExprType)) 968e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 969e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the expression is the name of a non-volatile automatic object ... 970e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // We ignore parentheses here. 971e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Is this compliant? 972e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 973e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!DR) 974e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 975e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 976e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!VD) 977e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 978e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return VD->hasLocalStorage() && !VD->getType()->isReferenceType() 979e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl && !VD->getType().isVolatileQualified(); 980e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl} 981e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 9824cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 983f53b4433abb7a3bc14c0329d3175cbc291280137Anders CarlssonSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 984f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson Expr *RetValExp = rex.takeAs<Expr>(); 9854eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 9864eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 9874cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 988371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 989f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 990371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 99140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (FD->hasAttr<NoReturnAttr>()) 9928662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 993f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 994f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 995c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 996c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 997c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 9981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9995cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 10001be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor if (RetValExp && !RetValExp->isTypeDependent()) { 10011be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor // C99 6.8.6.4p1 (ext_ since GCC warns) 100265ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 100365ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 100465ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 10054cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1006e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 1007e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 1008e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 1009e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1010e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 1011e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 1012e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 1013e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 10141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1015f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 10165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10178189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 10185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10194cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 102003d77760a5db7990724b6901cea958a673ce0b39Anders Carlsson if (!RetValExp && !FnRetType->isDependentType()) { 10213c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 10223c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 10233c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 10243c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 10253c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 102608631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 10273c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 102808631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 10298189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); 10303c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner } 10314cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1032898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 1033898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // we have a non-void function with an expression, continue checking 10344cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 10351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 10361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 10374cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // function return. 10384cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1039e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p15: When certain criteria are met, an implementation is 1040e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // allowed to omit the copy construction of a class object, [...] 1041e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with a class return type, when 1042e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the expression is the name of a non-volatile automatic object with 1043e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the same cv-unqualified type as the function return type, the copy 1044e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // operation can be omitted [...] 1045e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p16: When the criteria for elision of a copy operation are met 1046e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // and the object to be copied is designated by an lvalue, overload 1047e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // resolution to select the constructor for the copy is first performed 1048e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // as if the object were designated by an rvalue. 1049e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // Note that we only compute Elidable if we're in C++0x, since we don't 1050e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // care otherwise. 1051e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl bool Elidable = getLangOptions().CPlusPlus0x ? 1052e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl IsReturnCopyElidable(Context, FnRetType, RetValExp) : 1053e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl false; 1054e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 1055898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // In C++ the return statement is handled via a copy initialization. 10564cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // the C version of which boils down to CheckSingleAssignmentConstraints. 1057e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Leaks RetValExp on error. 105866724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)){ 105966724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor // We should still clean up our temporaries, even when we're failing! 106066724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 10614cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 106266724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 106366724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor 1064898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1065898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 1066898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor 1067f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson if (RetValExp) 1068f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 10698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 10705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1072810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1073810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1074810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1075810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1076810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1077810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1078810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 1079810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 1080810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 1081810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 1082810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1083810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 1084810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 1085810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 1086810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 1087810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 1088810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 1089810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1090810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 1091810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 1092810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1093810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 1094810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 1095810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 1096810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1097810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 1098810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 1099810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 1100810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1101810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 11023037ed0a27dba62e522304183718efc149e8b6d9Sebastian RedlSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 11033037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 11043037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 11053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 11063037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 11073037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl std::string *Names, 11083037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 11093037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 11103037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl ExprArg asmString, 11113037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 11123037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl SourceLocation RParenLoc) { 11133037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 11143037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 11153037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 11163037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 11173037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 11183037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 11193037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 112003eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 11211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11221708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 11236bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 11243037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 11253037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 11263037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11271708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 11281708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 11296bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11303037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 11313037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 11323037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TargetInfo::ConstraintInfo Info(Literal->getStrData(), 11342819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 11352819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1136432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 11373037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1138432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1139432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 11403037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1141d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 114272056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1143810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 114472056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1145dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 114672056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 114704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 114944def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 115004728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1152806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1153806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 115404728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 11551708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 11566bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11573037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 11583037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 11593037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TargetInfo::ConstraintInfo Info(Literal->getStrData(), 11612819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 11622819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1163beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 11642819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 11653037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1166432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1167432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1168d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 11693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 117072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 11713037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1172d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 117344def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1174810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 117572056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1176d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1177432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 117872056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 117904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11803037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 118144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1182d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 118372056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1184d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 11851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 118672056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1187d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1188d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 11891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11906032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson DefaultFunctionArrayConversion(Exprs[i]); 11911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1192806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 119304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11943037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11956fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 11961708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 11971708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 11986bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11993037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 12003037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 12013037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12027765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar std::string Clobber(Literal->getStrData(), 12037765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar Literal->getStrData() + 12047765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar Literal->getByteLength()); 12053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12066bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 12073037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 12087765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 12096fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 12103037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12113037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl constraints.release(); 12123037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl exprs.release(); 12133037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl asmString.release(); 12143037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl clobbers.release(); 1215fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1216fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 1217fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Names, Constraints, Exprs, AsmString, NumClobbers, 1218fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Clobbers, RParenLoc); 1219fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1220fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1221fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1222fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1223fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 12242ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 12252ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1226fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1227fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1228fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 12291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1230806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1231806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1232806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 12331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1234806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1235806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1236806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1237806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 12381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1239806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1240f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1241c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 12427adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 12437adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 12447adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1245806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 12461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12477adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // Int/ptr operands have some special cases that we allow. 12487adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if ((OutTy->isIntegerType() || OutTy->isPointerType()) && 12497adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner (InTy->isIntegerType() || InTy->isPointerType())) { 12501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12517adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // They are ok if they are the same size. Tying void* to int is ok if 12527adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // they are the same size, for example. This also allows tying void* to 12537adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // int*. 12543351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 12553351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 12563351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (OutSize == InSize) 1257806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; 12581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12593351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 12603351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // then we can promote it and the asm string won't notice. Check this 1261f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner // case now. 12623351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner bool SmallerValueMentioned = false; 126358bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 126458bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 126558bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner if (!Piece.isOperand()) continue; 12661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12673351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 12683351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 12693351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 12703351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize < OutSize) { 12713351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 12723351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 12733351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 12743351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 12753351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 12763351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 12773351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 12783351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == TiedTo) { 12793351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize > OutSize) { 12803351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 12813351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 12823351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 12833351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1284f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 12851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12863351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 12873351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // output was a register, just extend the shorter one to the size of the 12883351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // larger one. 12893351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (!SmallerValueMentioned && 1290f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1291f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner continue; 1292806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 12931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1294c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1295806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 12967adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1297806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1298806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1299806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1300806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 13011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1302fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1303fe795956194141c91ae555985c9b930595bff43fChris Lattner} 13043b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1305431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1306431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1307b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner SourceLocation RParen, DeclPtrTy Parm, 1308431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Body, StmtArg catchList) { 1309f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *CatchList = catchList.takeAs<Stmt>(); 1310b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); 13111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1312f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff // PVD == 0 implies @catch(...). 13139d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD) { 131493c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner // If we already know the decl is invalid, reject it. 131593c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner if (PVD->isInvalidDecl()) 131693c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner return StmtError(); 13171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1318f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!PVD->getType()->isObjCObjectPointerType()) 13191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return StmtError(Diag(PVD->getLocation(), 13209d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff diag::err_catch_param_not_objc_type)); 13219d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD->getType()->isObjCQualifiedIdType()) 13221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return StmtError(Diag(PVD->getLocation(), 1323d198abae5938262e501a409e833bf01ca8b8253eSteve Naroff diag::err_illegal_qualifiers_on_catch_parm)); 13249d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff } 132593c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 13268189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, 1327e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson PVD, Body.takeAs<Stmt>(), CatchList); 1328431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl return Owned(CatchList ? CatchList : CS); 13293b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 13303b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1331431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1332431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 13338189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 13348189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(Body.release()))); 1335161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1336bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1337431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1338431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 1339431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Try, StmtArg Catch, StmtArg Finally) { 134038c5ebd7b1b65304c7b5c7b9bf3f9162df22e77dChris Lattner CurFunctionNeedsScopeChecking = true; 1341e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), 1342e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Catch.takeAs<Stmt>(), 1343e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Finally.takeAs<Stmt>())); 1344bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1345bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1346431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 13473dcfe10a6801eb52f4c20f1242bea0a3a98aa146Steve NaroffSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { 1348f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *ThrowExpr = expr.takeAs<Expr>(); 13497151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!ThrowExpr) { 1350e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1351e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1352e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1353e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1354e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1355e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 13564ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 13577151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } else { 13587151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff QualType ThrowType = ThrowExpr->getType(); 13597151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff // Make sure the expression type is an ObjC pointer or "void *". 1360f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!ThrowType->isObjCObjectPointerType()) { 13616217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = ThrowType->getAs<PointerType>(); 13627151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!PT || !PT->getPointeeType()->isVoidType()) 13634ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 13644ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff << ThrowExpr->getType() << ThrowExpr->getSourceRange()); 13657151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 13667151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 13677151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); 136839f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1369bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1370431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1371431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 1372431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg SynchBody) { 137346c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner CurFunctionNeedsScopeChecking = true; 137446c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1375a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 1376a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 1377f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SyncExpr->getType()->isObjCObjectPointerType()) { 13786217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1379a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1380a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1381a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1382a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 13831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 1385e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchExpr.takeAs<Stmt>(), 1386e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchBody.takeAs<Stmt>())); 1387fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 13884b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 13894b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 13904b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 13914b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 1392b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris LattnerSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 13934b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 13944b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 13958189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1396b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 1397e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson HandlerBlock.takeAs<Stmt>())); 13984b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 13998351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1400c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1401c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1402c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1403c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1404c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1405c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1406c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 14070953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 14080953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 1409c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 14100953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 1411c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 14120953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 1413c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1414c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1415c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1416c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1418c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 14190953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 1420c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1422c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType getQualType() const { return t; } 1423c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1424c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1425c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1426c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1427c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1428c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 14298351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 14308351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 14318351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 14328351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 14338351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 14348351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 14358351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 14368351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 14378351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 14388351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1439c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 14401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 14428351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1443c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1444c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1445c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1446c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 14471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1448c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1449c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1451c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1452c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1453c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1454c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1455c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1456c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1457c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1458c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 14591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1460c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1461c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1462c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 14631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1464c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1465c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1466c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1467c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1468c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1469c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1470c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1471c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1473c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1474c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14758351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 14761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14778351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 14788351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 14798351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 14808351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 14818351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 14828351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1483972041f45bdf8df7ea447221292d7827466ba94bSebastian Redl CurFunctionNeedsScopeChecking = true; 14848351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 14858189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXTryStmt(TryLoc, 14868189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(TryBlock.release()), 14878189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek Handlers, NumHandlers)); 14888351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1489