SemaStmt.cpp revision a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9
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 23999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, DeclPtrTy CondVar, 240de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ThenVal, SourceLocation ElseLoc, 241de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ElseVal) { 242a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson OwningExprResult CondResult(CondVal.release()); 2431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2448cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 24599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondVar.get()) { 24699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 24799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = CheckConditionVariable(ConditionVar); 24899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 24999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2508cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 25199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 25299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 25399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2548cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor 25599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CheckBooleanCondition(ConditionExpr, IfLoc)) { 25699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = ConditionExpr; 2575a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 258d06f6ca61062f85926eb9d409eb3d4f8afcf93c7Douglas Gregor } 259de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 260e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *thenStmt = ThenVal.takeAs<Stmt>(); 261754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 2625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2632d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2642d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2652d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2662d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 2671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!ElseVal.get()) { 2682d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2692d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2702d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2712d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 272754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *elseStmt = ElseVal.takeAs<Stmt>(); 273754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 2741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 275a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson CondResult.release(); 27699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return Owned(new (Context) IfStmt(IfLoc, ConditionVar, ConditionExpr, 27799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor thenStmt, ElseLoc, elseStmt)); 2785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 280de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 28199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnStartOfSwitchStmt(FullExprArg cond, DeclPtrTy CondVar) { 28299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult CondResult(cond.release()); 28399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 284d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor VarDecl *ConditionVar = 0; 28599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondVar.get()) { 28699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 28799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = CheckConditionVariable(ConditionVar); 28899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 28999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 290d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor } 29199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 29299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 29399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 294d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor 29599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult.release(); 29699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor SwitchStmt *SS = new (Context) SwitchStmt(ConditionVar, ConditionExpr); 297bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().push_back(SS); 298de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 299c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson} 3006c36be5b383875b490684bcf439d6d427298c1afChris Lattner 301f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 302f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 303f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 304f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 305f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 3061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 307f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 308f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 309f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 310f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 311f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 312f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 3131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 314f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If the input was signed and negative and the output is unsigned, 315f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // warn. 316f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) 317d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 3181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 319f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 320f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 321f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 322f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 323f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 324b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 325f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 326b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 327f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 328d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 3291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 330f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 331f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 332f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 333b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 334f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 335f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 336f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 337f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 338f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 3391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 340f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (Val.isNegative()) // Sign bit changes meaning. 341d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); 342f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 343f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 344f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3450471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3460471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3470471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3480471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3490471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3500471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3510e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3520e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3530e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3540e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3550471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3560471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3570471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3580471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3590471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3600471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3610471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 362764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 363764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 364764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 365764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 366764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 367764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 368764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 369764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 370764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 371764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 372764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 373764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 374764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 375764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 3765f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 3775f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 3785f04881eb025f61396d0555d8173730fe2759e0aChris Lattnerstatic QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { 3795f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const ImplicitCastExpr *ImplicitCast = 3805f04881eb025f61396d0555d8173730fe2759e0aChris Lattner dyn_cast_or_null<ImplicitCastExpr>(expr); 3815f04881eb025f61396d0555d8173730fe2759e0aChris Lattner if (ImplicitCast != NULL) { 3825f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); 3835f04881eb025f61396d0555d8173730fe2759e0aChris Lattner QualType TypeBeforePromotion = ExprBeforePromotion->getType(); 3845f04881eb025f61396d0555d8173730fe2759e0aChris Lattner if (TypeBeforePromotion->isIntegralType()) { 3855f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return TypeBeforePromotion; 3865f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3875f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3885f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 3895f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 3905f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 3910be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor/// \brief Check (and possibly convert) the condition in a switch 3920be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor/// statement in C++. 3930be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregorstatic bool CheckCXXSwitchCondition(Sema &S, SourceLocation SwitchLoc, 3940be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor Expr *&CondExpr) { 3950be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (CondExpr->isTypeDependent()) 3960be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor return false; 3970be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 3980be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor QualType CondType = CondExpr->getType(); 3990be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4000be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // C++ 6.4.2.p2: 4010be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // The condition shall be of integral type, enumeration type, or of a class 4020be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // type for which a single conversion function to integral or enumeration 4030be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // type exists (12.3). If the condition is of class type, the condition is 4040be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // converted by calling that conversion function, and the result of the 4050be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // conversion is used in place of the original condition for the remainder 4060be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // of this section. Integral promotions are performed. 4070be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4080be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // Make sure that the condition expression has a complete type, 4090be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // otherwise we'll never find any conversions. 4100be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (S.RequireCompleteType(SwitchLoc, CondType, 4110be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 4120be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << CondExpr->getSourceRange())) 4130be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor return true; 4140be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4150be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor llvm::SmallVector<CXXConversionDecl *, 4> ViableConversions; 4160be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor llvm::SmallVector<CXXConversionDecl *, 4> ExplicitConversions; 4170be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (const RecordType *RecordTy = CondType->getAs<RecordType>()) { 4180be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor const UnresolvedSet *Conversions 4190be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor = cast<CXXRecordDecl>(RecordTy->getDecl()) 4200be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor ->getVisibleConversionFunctions(); 4210be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor for (UnresolvedSet::iterator I = Conversions->begin(), 4220be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor E = Conversions->end(); I != E; ++I) { 4230be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(*I)) 4240be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (Conversion->getConversionType().getNonReferenceType() 4250be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor ->isIntegralType()) { 4260be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (Conversion->isExplicit()) 4270be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor ExplicitConversions.push_back(Conversion); 4280be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor else 4290be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor ViableConversions.push_back(Conversion); 4300be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor } 4310be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor } 4320be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4330be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor switch (ViableConversions.size()) { 4340be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor case 0: 4350be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (ExplicitConversions.size() == 1) { 4360be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // The user probably meant to invoke the given explicit 4370be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // conversion; use it. 4380be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor QualType ConvTy 4390be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor = ExplicitConversions[0]->getConversionType() 4400be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor .getNonReferenceType(); 4410be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor std::string TypeStr; 4420be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor ConvTy.getAsStringInternal(TypeStr, S.Context.PrintingPolicy); 4430be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4440be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor S.Diag(SwitchLoc, diag::err_switch_explicit_conversion) 4450be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << CondType << ConvTy << CondExpr->getSourceRange() 4460be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << CodeModificationHint::CreateInsertion(CondExpr->getLocStart(), 4470be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor "static_cast<" + TypeStr + ">(") 4480be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << CodeModificationHint::CreateInsertion( 4490be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor S.PP.getLocForEndOfToken(CondExpr->getLocEnd()), 4500be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor ")"); 4510be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor S.Diag(ExplicitConversions[0]->getLocation(), 4520be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor diag::note_switch_conversion) 4530be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 4540be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4550be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // If we aren't in a SFINAE context, build a call to the 4560be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // explicit conversion function. 4570be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor if (S.isSFINAEContext()) 4580be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor return true; 4590be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4600be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor CondExpr = S.BuildCXXMemberCallExpr(CondExpr, ExplicitConversions[0]); 4610be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor } 4620be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4630be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // We'll complain below about a non-integral condition type. 4640be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor break; 4650be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4660be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor case 1: 4670be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor // Apply this conversion. 4680be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor CondExpr = S.BuildCXXMemberCallExpr(CondExpr, ViableConversions[0]); 4690be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor break; 4700be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4710be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor default: 4720be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor S.Diag(SwitchLoc, diag::err_switch_multiple_conversions) 4730be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << CondType << CondExpr->getSourceRange(); 4740be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor for (unsigned I = 0, N = ViableConversions.size(); I != N; ++I) { 4750be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor QualType ConvTy 4760be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor = ViableConversions[I]->getConversionType().getNonReferenceType(); 4770be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor S.Diag(ViableConversions[I]->getLocation(), 4780be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor diag::note_switch_conversion) 4790be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 4800be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor } 4810be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor return true; 4820be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor } 4830be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor } 4840be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 4850be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor return false; 4860be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor} 4870be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor 488de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 489de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 490de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 491e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *BodyStmt = Body.takeAs<Stmt>(); 492de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 493bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner SwitchStmt *SS = getSwitchStack().back(); 494de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 495de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4969dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 4971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getSwitchStack().pop_back(); 498c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 499f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 50084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType CondTypeBeforePromotion = 50184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor GetTypeBeforeIntegralPromotion(CondExpr); 502de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 503a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor if (getLangOptions().CPlusPlus && 504a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor CheckCXXSwitchCondition(*this, SwitchLoc, CondExpr)) 5050be3193b3bc695eb4b0debc7f85bc832026ce862Douglas Gregor return StmtError(); 506a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor 507a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 50884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SS->setCond(CondExpr); 50984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 5105f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 5115f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 5125f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 5135f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 5145f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 5155f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 5165f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 51712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 51812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondType->isIntegerType()) { // C99 6.8.4.2p1 51912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 52012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondType << CondExpr->getSourceRange(); 52112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 52212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 52312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 524a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor UsualUnaryConversions(CondExpr); 525a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor 52612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (CondTypeBeforePromotion->isBooleanType()) { 52712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 52812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 52912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 53012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 53112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 53212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 533c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 534de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 535f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 536f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 5371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 538dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 5391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 540dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 5415f04881eb025f61396d0555d8173730fe2759e0aChris Lattner : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); 5425f04881eb025f61396d0555d8173730fe2759e0aChris Lattner bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); 5431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 544f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 545f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 546f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 5470471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 5480471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 5491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 550f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 551f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 5521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 553f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 5541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 555b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 5561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 557dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 558c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 5591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 560c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 561f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 562f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 5635f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 564de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 565f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 566390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 567390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 568390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 569b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 570c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 571f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 5721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 573f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 574f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 5751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 576f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 577f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 5781e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 579dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 580dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 581dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 582dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 583dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 58551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 5861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 587f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 588f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 589f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 590f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 5916c36be5b383875b490684bcf439d6d427298c1afChris Lattner 5921e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 5931e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 59473c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Lo, CondType, CastExpr::CK_IntegralCast); 5951e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 5961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 597b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 598dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 5991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 600dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 601dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 602dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 603dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 604f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 6051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 606b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 607f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 608f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 609b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 610dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 611dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 612dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 613dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 614dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 615dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 616dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseVals[i].first == CaseVals[i+1].first) { 617dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 618dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 619dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::err_duplicate_case) << CaseVals[i].first.toString(10); 6201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 621dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 622390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 623390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 624dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 625dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6266efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 627b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 6281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 629dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 630dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 631dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 632dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 633dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 634dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 6351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 636dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 637dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 638dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 640dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 641dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 6421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 643dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 644dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 645dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 646dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 6471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 648dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 649dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 65073c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Hi, CondType, CastExpr::CK_IntegralCast); 651dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 6521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 653dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 654dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseRanges[i].first > HiVal) { 655dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 656dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 657dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 658dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 659dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 660dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 661dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 662dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 6630471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 6641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 665dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 666dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 667dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 668dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 669dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 670dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 671dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 6721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 675dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 676dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 6771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 679dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 680dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 682dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 683dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 684dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 685dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 686dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 688dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 689dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 690dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 691dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 692dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 693dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 695dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 696dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 697dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 698dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 699dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 700dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 702dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 703dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 704dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 705dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 7061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 707dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 708390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 709390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 710dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 711dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7120471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 713b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 714b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 715dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 716390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 717390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 718b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 719de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 720de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 721de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 722de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 7235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 725f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 72699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 72799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor DeclPtrTy CondVar, StmtArg Body) { 72899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult CondResult(Cond.release()); 72999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 7305656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 73199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondVar.get()) { 73299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 73399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = CheckConditionVariable(ConditionVar); 73499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 73599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 7365656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 73799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 73899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 73999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 74099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 74199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CheckBooleanCondition(ConditionExpr, WhileLoc)) { 74299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = ConditionExpr; 7435a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7444a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } 7455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 746754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 747754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 7481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 74999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult.release(); 75099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return Owned(new (Context) WhileStmt(ConditionVar, ConditionExpr, bodyStmt, 7515656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor WhileLoc)); 7525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 754f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 755f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 756989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 757989135901c750af61ef012b6b0a0368be415bc46Chris Lattner ExprArg Cond, SourceLocation CondRParen) { 758e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 7591b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 760f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7615a881bb09928b7ade891efc680088aaad276f8d6John McCall if (CheckBooleanCondition(condExpr, DoLoc)) { 7629f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor Cond = condExpr; 7635a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7649f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } 7655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 766754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 767754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 768754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 769f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 770754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) DoStmt(bodyStmt, condExpr, DoLoc, 771989135901c750af61ef012b6b0a0368be415bc46Chris Lattner WhileLoc, CondRParen)); 7725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 774f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 775f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 77699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor StmtArg first, FullExprArg second, DeclPtrTy secondVar, 77799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 778f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 779f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 780f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7815921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 7825921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 783f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 784f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 785f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 7865921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 7875921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 7885921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 7895921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 7905921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 7915921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 7925921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 7935921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 7945921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 795ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 7965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 79799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 79899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult SecondResult(second.release()); 79999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 80099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (secondVar.get()) { 80199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = secondVar.getAs<VarDecl>(); 80299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor SecondResult = CheckConditionVariable(ConditionVar); 80399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 80499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 80599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 80699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 80799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Second = SecondResult.takeAs<Expr>(); 8085a881bb09928b7ade891efc680088aaad276f8d6John McCall if (Second && CheckBooleanCondition(Second, ForLoc)) { 80999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor SecondResult = Second; 8105a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 8115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 81399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 81499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Stmt *Body = static_cast<Stmt*>(body.get()); 81599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8163af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 8173af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 818754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 819754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 820f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 821f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 82299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return Owned(new (Context) ForStmt(First, Second, ConditionVar, Third, Body, 82399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ForLoc, LParenLoc, RParenLoc)); 8245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 826f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 827f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 828f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 829f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 830f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 831f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 832f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 833f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 83420552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 83520552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 83620552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 8377e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 838f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 839f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 840f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8417e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 842f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 843f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 844f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 845f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 846248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 847248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 848f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 849f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 8501fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 851810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) 852f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 853f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 854f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 8551fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 8561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 8571fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 8581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!FirstType->isObjCObjectPointerType() && 859a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 860dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 861d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 8623ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 8633ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian if (Second) { 8643ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian DefaultFunctionArrayConversion(Second); 8653ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 866f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 867dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 868d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 8693ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 870f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 871f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 872f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 8738189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 8748189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 8753ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 8765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8781b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 8795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 8804eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If we are in a block, reject all gotos for now. 8814eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 8824cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 8834eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff 8845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 885ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 8865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 887caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 888caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 8898189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 8904cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8918189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 8925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8944cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 895ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 8964cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 897bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 89833083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman Expr* E = DestExp.takeAs<Expr>(); 8995f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 9005f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 9015f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 9025f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); 9035f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, 9045f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor E, "passing")) 9055f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 9065f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 9075f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 9085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9104cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9111b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 9125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 9135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 9154cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 9165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9174cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9188189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 9195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9214cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9221b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 9235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 9245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 9264cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 9275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9284cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9298189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 9305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 93227c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 9334eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 9344cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9354eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 9364eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 9374eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 9387d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 939c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 94016564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 94116564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 94216564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff DefaultFunctionArrayConversion(RetValExp); 9437d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 9447d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 9457d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 9467d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 9477d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 9487d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 9497d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 9507d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 951c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 9527d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 9534eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9547d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 9554cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 95640b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 9576c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 9586c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 9596c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 9606c92fa75e62937f9738696840efcb258560f4568Mike Stump } 9616c92fa75e62937f9738696840efcb258560f4568Mike Stump 9624eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 9634eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 9644eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 9654eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 9664eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 9674eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 9688189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek RetValExp->Destroy(Context); 9694eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 9704eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9718189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9724eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9734cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9744cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl if (!RetValExp) 9754cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 9764cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 97798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 97898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // we have a non-void block with an expression, continue checking 97998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump QualType RetValType = RetValExp->getType(); 98098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 9811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 9821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 98398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // function return. 9844cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 98598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // In C++ the return statement is handled via a copy initialization. 98698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // the C version of which boils down to CheckSingleAssignmentConstraints. 98798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // FIXME: Leaks RetValExp. 98898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 98998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump return StmtError(); 99098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 99198eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 99298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 9934cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9948189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9954eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 9965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 997e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// IsReturnCopyElidable - Whether returning @p RetExpr from a function that 998e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). 999e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redlstatic bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, 1000e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Expr *RetExpr) { 1001e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl QualType ExprType = RetExpr->getType(); 1002e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with ... 1003e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... a class return type ... 1004e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!RetType->isRecordType()) 1005e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1006e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the same cv-unqualified type as the function return type ... 1007a4923eb7c4b04d360cb2747641a5e92818edf804Douglas Gregor if (!Ctx.hasSameUnqualifiedType(RetType, ExprType)) 1008e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1009e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the expression is the name of a non-volatile automatic object ... 1010e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // We ignore parentheses here. 1011e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Is this compliant? 1012e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 1013e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!DR) 1014e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1015e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 1016e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!VD) 1017e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1018e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return VD->hasLocalStorage() && !VD->getType()->isReferenceType() 1019e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl && !VD->getType().isVolatileQualified(); 1020e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl} 1021e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 10224cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 1023f53b4433abb7a3bc14c0329d3175cbc291280137Anders CarlssonSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 1024f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson Expr *RetValExp = rex.takeAs<Expr>(); 10254eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 10264eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 10274cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1028371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1029f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1030371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 103140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (FD->hasAttr<NoReturnAttr>()) 10328662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 1033f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 1034f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1035c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 1036c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 1037c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 10381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10395cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 10401be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor if (RetValExp && !RetValExp->isTypeDependent()) { 10411be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor // C99 6.8.6.4p1 (ext_ since GCC warns) 104265ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 104365ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 104465ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 10454cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1046e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 1047e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 1048e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 1049e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1050e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 1051e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 1052e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 1053e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 10541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1055f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 10565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10578189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 10585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10594cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 106003d77760a5db7990724b6901cea958a673ce0b39Anders Carlsson if (!RetValExp && !FnRetType->isDependentType()) { 10613c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 10623c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 10633c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 10643c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 10653c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 106608631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 10673c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 106808631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 10698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); 10703c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner } 10714cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1072898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 1073898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // we have a non-void function with an expression, continue checking 10744cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 10751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 10761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 10774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // function return. 10784cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1079e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p15: When certain criteria are met, an implementation is 1080e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // allowed to omit the copy construction of a class object, [...] 1081e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with a class return type, when 1082e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the expression is the name of a non-volatile automatic object with 1083e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the same cv-unqualified type as the function return type, the copy 1084e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // operation can be omitted [...] 1085e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p16: When the criteria for elision of a copy operation are met 1086e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // and the object to be copied is designated by an lvalue, overload 1087e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // resolution to select the constructor for the copy is first performed 1088e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // as if the object were designated by an rvalue. 1089e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // Note that we only compute Elidable if we're in C++0x, since we don't 1090e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // care otherwise. 1091e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl bool Elidable = getLangOptions().CPlusPlus0x ? 1092e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl IsReturnCopyElidable(Context, FnRetType, RetValExp) : 1093e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl false; 1094e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 1095898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // In C++ the return statement is handled via a copy initialization. 10964cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // the C version of which boils down to CheckSingleAssignmentConstraints. 1097e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Leaks RetValExp on error. 109866724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)){ 109966724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor // We should still clean up our temporaries, even when we're failing! 110066724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 11014cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 110266724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 110366724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor 1104898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1105898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 1106898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor 1107f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson if (RetValExp) 1108f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 11098189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 11105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 11115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1112810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1113810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1114810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1115810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1116810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1117810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1118810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 1119810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 1120810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 1121810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 1122810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1123810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 1124810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 1125810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 1126810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 1127810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 1128810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 1129810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1130810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 1131810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 1132810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1133810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 1134810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 1135810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 1136810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1137810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 1138810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 1139810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 1140810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1141810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 11423037ed0a27dba62e522304183718efc149e8b6d9Sebastian RedlSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 11433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 11443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 11453037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 11463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 11473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl std::string *Names, 11483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 11493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 11503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl ExprArg asmString, 11513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 11523037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl SourceLocation RParenLoc) { 11533037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 11543037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 11553037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 11563037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 11573037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 11583037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 11593037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 116003eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 11611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11621708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 11636bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 11643037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 11653037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 11663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11671708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 11681708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 11696bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11703037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 11713037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 11723037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TargetInfo::ConstraintInfo Info(Literal->getStrData(), 11742819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 11752819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1176432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 11773037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1178432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1179432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 11803037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1181d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 118272056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1183810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 118472056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1185dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 118672056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 118704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 118944def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 119004728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11913037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1192806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1193806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 119404728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 11951708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 11966bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11973037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 11983037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 11993037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TargetInfo::ConstraintInfo Info(Literal->getStrData(), 12012819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 12022819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1203beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 12042819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 12053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1206432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1207432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1208d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 12093037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 121072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 12113037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1212d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 121344def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1214810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 121572056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1216d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1217432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 121872056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 121904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 12203037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 122144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1222d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 122372056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1224d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 12251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 122672056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1227d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1228d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 12291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12306032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson DefaultFunctionArrayConversion(Exprs[i]); 12311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1232806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 123304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 12343037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12356fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 12361708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 12371708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 12386bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 12393037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 12403037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 12413037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12427765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar std::string Clobber(Literal->getStrData(), 12437765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar Literal->getStrData() + 12447765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar Literal->getByteLength()); 12453037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12466bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 12473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 12487765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 12496fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 12503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl constraints.release(); 12523037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl exprs.release(); 12533037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl asmString.release(); 12543037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl clobbers.release(); 1255fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1256fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 1257fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Names, Constraints, Exprs, AsmString, NumClobbers, 1258fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Clobbers, RParenLoc); 1259fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1260fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1261fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1262fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1263fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 12642ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 12652ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1266fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1267fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1268fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 12691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1270806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1271806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1272806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 12731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1274806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1275806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1276806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1277806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 12781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1279806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1280f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1281c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 12827adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 12837adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 12847adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1285806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 12861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12877adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // Int/ptr operands have some special cases that we allow. 12887adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if ((OutTy->isIntegerType() || OutTy->isPointerType()) && 12897adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner (InTy->isIntegerType() || InTy->isPointerType())) { 12901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12917adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // They are ok if they are the same size. Tying void* to int is ok if 12927adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // they are the same size, for example. This also allows tying void* to 12937adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // int*. 12943351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 12953351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 12963351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (OutSize == InSize) 1297806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; 12981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12993351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 13003351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // then we can promote it and the asm string won't notice. Check this 1301f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner // case now. 13023351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner bool SmallerValueMentioned = false; 130358bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 130458bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 130558bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner if (!Piece.isOperand()) continue; 13061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13073351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 13083351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 13093351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 13103351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize < OutSize) { 13113351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 13123351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 13133351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 13143351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 13153351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 13163351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 13173351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 13183351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == TiedTo) { 13193351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize > OutSize) { 13203351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 13213351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 13223351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 13233351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1324f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 13251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13263351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 13273351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // output was a register, just extend the shorter one to the size of the 13283351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // larger one. 13293351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (!SmallerValueMentioned && 1330f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1331f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner continue; 1332806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 13331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1334c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1335806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 13367adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1337806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1338806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1339806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1340806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 13411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1342fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1343fe795956194141c91ae555985c9b930595bff43fChris Lattner} 13443b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1345431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1346431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1347b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner SourceLocation RParen, DeclPtrTy Parm, 1348431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Body, StmtArg catchList) { 1349f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *CatchList = catchList.takeAs<Stmt>(); 1350b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); 13511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1352f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff // PVD == 0 implies @catch(...). 13539d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD) { 135493c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner // If we already know the decl is invalid, reject it. 135593c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner if (PVD->isInvalidDecl()) 135693c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner return StmtError(); 13571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1358f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!PVD->getType()->isObjCObjectPointerType()) 13591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return StmtError(Diag(PVD->getLocation(), 13609d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff diag::err_catch_param_not_objc_type)); 13619d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD->getType()->isObjCQualifiedIdType()) 13621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return StmtError(Diag(PVD->getLocation(), 1363d198abae5938262e501a409e833bf01ca8b8253eSteve Naroff diag::err_illegal_qualifiers_on_catch_parm)); 13649d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff } 136593c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 13668189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, 1367e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson PVD, Body.takeAs<Stmt>(), CatchList); 1368431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl return Owned(CatchList ? CatchList : CS); 13693b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 13703b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1371431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1372431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 13738189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 13748189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(Body.release()))); 1375161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1376bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1377431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1378431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 1379431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Try, StmtArg Catch, StmtArg Finally) { 138038c5ebd7b1b65304c7b5c7b9bf3f9162df22e77dChris Lattner CurFunctionNeedsScopeChecking = true; 1381e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), 1382e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Catch.takeAs<Stmt>(), 1383e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Finally.takeAs<Stmt>())); 1384bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1385bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1386431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 13873dcfe10a6801eb52f4c20f1242bea0a3a98aa146Steve NaroffSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { 1388f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *ThrowExpr = expr.takeAs<Expr>(); 13897151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!ThrowExpr) { 1390e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1391e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1392e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1393e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1394e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1395e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 13964ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 13977151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } else { 13987151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff QualType ThrowType = ThrowExpr->getType(); 13997151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff // Make sure the expression type is an ObjC pointer or "void *". 1400f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!ThrowType->isObjCObjectPointerType()) { 14016217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = ThrowType->getAs<PointerType>(); 14027151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!PT || !PT->getPointeeType()->isVoidType()) 14034ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 14044ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff << ThrowExpr->getType() << ThrowExpr->getSourceRange()); 14057151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 14067151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 14077151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); 140839f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1409bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1410431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1411431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 1412431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg SynchBody) { 141346c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner CurFunctionNeedsScopeChecking = true; 141446c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1415a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 1416a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 1417f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SyncExpr->getType()->isObjCObjectPointerType()) { 14186217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1419a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1420a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1421a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1422a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 14231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 1425e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchExpr.takeAs<Stmt>(), 1426e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchBody.takeAs<Stmt>())); 1427fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 14284b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 14294b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 14304b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 14314b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 1432b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris LattnerSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 14334b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 14344b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 14358189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1436b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 1437e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson HandlerBlock.takeAs<Stmt>())); 14384b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 14398351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1440c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1441c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1442c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1443c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1444c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1445c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1446c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 14470953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 14480953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 1449c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 14500953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 1451c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 14520953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 1453c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1454c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1455c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1456c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1458c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 14590953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 1460c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1462c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType getQualType() const { return t; } 1463c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1464c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1465c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1466c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1467c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1468c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 14698351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 14708351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 14718351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 14728351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 14738351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 14748351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 14758351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 14768351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 14778351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 14788351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1479c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 14801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 14828351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1483c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1484c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1485c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1486c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 14871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1488c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1489c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1491c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1492c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1493c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1494c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1495c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1496c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1497c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1498c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 14991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1500c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1501c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1502c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 15031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1504c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1505c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1506c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1507c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1508c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1509c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1510c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1511c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1513c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1514c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15158351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 15161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15178351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 15188351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 15198351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 15208351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 15218351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 15228351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1523972041f45bdf8df7ea447221292d7827466ba94bSebastian Redl CurFunctionNeedsScopeChecking = true; 15248351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 15258189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXTryStmt(TryLoc, 15268189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(TryBlock.release()), 15278189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek Handlers, NumHandlers)); 15288351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1529