SemaStmt.cpp revision 99e9b4d172f6877e6ba5ebe75bb8238721f5e01c
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 391de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 392de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 393de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 394e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *BodyStmt = Body.takeAs<Stmt>(); 395de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 396bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner SwitchStmt *SS = getSwitchStack().back(); 397de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 398de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 3999dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 4001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getSwitchStack().pop_back(); 401c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 402f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 40384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType CondTypeBeforePromotion = 40484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor GetTypeBeforeIntegralPromotion(CondExpr); 405f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner QualType CondType = CondExpr->getType(); 406de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 40784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (getLangOptions().CPlusPlus) { 40884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // C++ 6.4.2.p2: 40984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // The condition shall be of integral type, enumeration type, or of a class 41084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // type for which a single conversion function to integral or enumeration 41184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // type exists (12.3). If the condition is of class type, the condition is 41284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // converted by calling that conversion function, and the result of the 41384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // conversion is used in place of the original condition for the remainder 41484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // of this section. Integral promotions are performed. 41584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (!CondExpr->isTypeDependent()) { 416f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor // Make sure that the condition expression has a complete type, 417f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor // otherwise we'll never find any conversions. 418f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor if (RequireCompleteType(SwitchLoc, CondType, 419f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 420f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor << CondExpr->getSourceRange())) 421f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor return StmtError(); 422f21bac640870db0569e697a8a14f59f6ca069f80Douglas Gregor 42384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor llvm::SmallVector<CXXConversionDecl *, 4> ViableConversions; 42484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor llvm::SmallVector<CXXConversionDecl *, 4> ExplicitConversions; 42584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (const RecordType *RecordTy = CondType->getAs<RecordType>()) { 42684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor const UnresolvedSet *Conversions 42784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor = cast<CXXRecordDecl>(RecordTy->getDecl()) 42884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ->getVisibleConversionFunctions(); 42984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor for (UnresolvedSet::iterator I = Conversions->begin(), 43084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor E = Conversions->end(); I != E; ++I) { 43184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(*I)) 43284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (Conversion->getConversionType().getNonReferenceType() 43384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ->isIntegralType()) { 43484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (Conversion->isExplicit()) 43584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ExplicitConversions.push_back(Conversion); 43684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor else 43784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ViableConversions.push_back(Conversion); 43884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 43984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 44084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 44184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor switch (ViableConversions.size()) { 44284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor case 0: 44384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (ExplicitConversions.size() == 1) { 44484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // The user probably meant to invoke the given explicit 44584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // conversion; use it. 44684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType ConvTy 44784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor = ExplicitConversions[0]->getConversionType() 44884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor .getNonReferenceType(); 44984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor std::string TypeStr; 45084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ConvTy.getAsStringInternal(TypeStr, Context.PrintingPolicy); 45184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 45284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 45384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(SwitchLoc, diag::err_switch_explicit_conversion) 45484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CondType << ConvTy << CondExpr->getSourceRange() 45584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CodeModificationHint::CreateInsertion(CondExpr->getLocStart(), 45684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor "static_cast<" + TypeStr + ">(") 45784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CodeModificationHint::CreateInsertion( 45884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor PP.getLocForEndOfToken(CondExpr->getLocEnd()), 45984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ")"); 46084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(ExplicitConversions[0]->getLocation(), 46184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor diag::note_switch_conversion) 46284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 46384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 46484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // If we aren't in a SFINAE context, build a call to the 46584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // explicit conversion function. 46684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (!isSFINAEContext()) 46784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondExpr = BuildCXXMemberCallExpr(CondExpr, 46884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor ExplicitConversions[0]); 46984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 47084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 47184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // We'll complain below about a non-integral condition type. 47284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor break; 47384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 47484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor case 1: 47584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // Apply this conversion. 47684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondExpr = BuildCXXMemberCallExpr(CondExpr, ViableConversions[0]); 47784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor break; 47884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 47984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor default: 48084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(SwitchLoc, diag::err_switch_multiple_conversions) 48184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << CondType << CondExpr->getSourceRange(); 48284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor for (unsigned I = 0, N = ViableConversions.size(); I != N; ++I) { 48384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType ConvTy 48484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor = ViableConversions[I]->getConversionType() 48584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor .getNonReferenceType(); 48684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor Diag(ViableConversions[I]->getLocation(), 48784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor diag::note_switch_conversion) 48884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 48984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 49084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor return StmtError(); 49184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 49284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 49384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondType = CondExpr->getType(); 49484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 49584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor if (CondType->isIntegralType() || CondType->isEnumeralType()) { 49684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // Integral promotions are performed. 49784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor UsualUnaryConversions(CondExpr); 49884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 49984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 50084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } else { 50184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 50284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor UsualUnaryConversions(CondExpr); 50384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor } 50484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor CondType = CondExpr->getType(); 50584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SS->setCond(CondExpr); 50684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 5075f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 5085f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 5095f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 5105f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 5115f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 5125f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 5135f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 51412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 51512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondType->isIntegerType()) { // C99 6.8.4.2p1 51612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) 51712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondType << CondExpr->getSourceRange(); 51812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 51912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 52012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 52112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (CondTypeBeforePromotion->isBooleanType()) { 52212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 52312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 52412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 52512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 52612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 52712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 528c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 529de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 530f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 531f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 5321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 533dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 5341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 535dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 5365f04881eb025f61396d0555d8173730fe2759e0aChris Lattner : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); 5375f04881eb025f61396d0555d8173730fe2759e0aChris Lattner bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); 5381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 539f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 540f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 541f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 5420471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 5430471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 5441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 545f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 546f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; 5471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 548f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 5491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 550b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 5511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 552dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 553c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 5541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 555c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 556f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 557f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 5585f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 559de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 560f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 561390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 562390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 563390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 564b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 565c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 566f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 5671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 568f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 569f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 5701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 571f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 572f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 5731e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 574dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 575dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 576dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 577dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 578dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 58051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 5811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 582f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 583f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 584f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 585f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 5866c36be5b383875b490684bcf439d6d427298c1afChris Lattner 5871e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 5881e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 58973c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Lo, CondType, CastExpr::CK_IntegralCast); 5901e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 5911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 592b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 593dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 5941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 595dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 596dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 597dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 598dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 599f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 6001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 601b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 602f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 603f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 604b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 605dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 606dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 607dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 608dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 609dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 610dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { 611dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseVals[i].first == CaseVals[i+1].first) { 612dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 613dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CaseVals[i+1].second->getLHS()->getLocStart(), 614dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::err_duplicate_case) << CaseVals[i].first.toString(10); 6151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 616dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 617390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 618390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 619dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 620dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6216efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 622b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 6231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 624dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 625dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 626dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 627dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 628dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 629dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 6301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 631dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 632dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 633dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 634dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 635dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 636dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 6371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 638dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 640dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 641dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 6421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 643dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 644dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 64573c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Hi, CondType, CastExpr::CK_IntegralCast); 646dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 6471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 648dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 649dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CaseRanges[i].first > HiVal) { 650dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 651dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 652dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 653dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 654dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 655dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 656dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 657dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 6580471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 6591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 660dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 661dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 662dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 663dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 664dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 665dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 666dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 6671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 668dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 669dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 670dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 671dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 6721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 675dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 676dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 677dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 679dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 680dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 683dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 684dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 685dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 686dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 687dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 688dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 690dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 691dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 692dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 693dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 694dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 695dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 697dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 698dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 699dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 700dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 7011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 702dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 703390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 704390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 705dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 706dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7070471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 708b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 709b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 710dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 711390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 712390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 713b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 714de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 715de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 716de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 717de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 7185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 720f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 72199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 72299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor DeclPtrTy CondVar, StmtArg Body) { 72399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult CondResult(Cond.release()); 72499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 7255656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 72699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondVar.get()) { 72799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 72899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = CheckConditionVariable(ConditionVar); 72999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 73099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 7315656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 73299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 73399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 73499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 73599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 73699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CheckBooleanCondition(ConditionExpr, WhileLoc)) { 73799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult = ConditionExpr; 7385a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7394a2e2041edc63db687677325e113b39b9d123c40Douglas Gregor } 7405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 741754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 742754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 7431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 74499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult.release(); 74599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return Owned(new (Context) WhileStmt(ConditionVar, ConditionExpr, bodyStmt, 7465656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor WhileLoc)); 7475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 749f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 750f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 751989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 752989135901c750af61ef012b6b0a0368be415bc46Chris Lattner ExprArg Cond, SourceLocation CondRParen) { 753e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 7541b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 755f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7565a881bb09928b7ade891efc680088aaad276f8d6John McCall if (CheckBooleanCondition(condExpr, DoLoc)) { 7579f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor Cond = condExpr; 7585a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 7599f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } 7605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 761754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 762754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 763754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 764f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 765754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) DoStmt(bodyStmt, condExpr, DoLoc, 766989135901c750af61ef012b6b0a0368be415bc46Chris Lattner WhileLoc, CondRParen)); 7675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 769f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 770f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 77199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor StmtArg first, FullExprArg second, DeclPtrTy secondVar, 77299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 773f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 774f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 775f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 7765921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 7775921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 778f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 779f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 780f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 7815921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 7825921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 7835921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 7845921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 7855921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 7865921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 7875921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 7885921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 7895921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 790ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 7915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 79299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 79399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult SecondResult(second.release()); 79499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 79599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (secondVar.get()) { 79699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = secondVar.getAs<VarDecl>(); 79799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor SecondResult = CheckConditionVariable(ConditionVar); 79899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 79999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 80099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 80199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 80299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Second = SecondResult.takeAs<Expr>(); 8035a881bb09928b7ade891efc680088aaad276f8d6John McCall if (Second && CheckBooleanCondition(Second, ForLoc)) { 80499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor SecondResult = Second; 8055a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 8065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 80899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 80999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Stmt *Body = static_cast<Stmt*>(body.get()); 81099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8113af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 8123af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 813754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 814754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 815f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 816f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 81799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return Owned(new (Context) ForStmt(First, Second, ConditionVar, Third, Body, 81899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ForLoc, LParenLoc, RParenLoc)); 8195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 821f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 822f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 823f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 824f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 825f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 826f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 827f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 828f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 82920552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 83020552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 83120552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 8327e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 833f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 834f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 835f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8367e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 837f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 838f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 839f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 840f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 841248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 842248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 843f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 844f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 8451fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 846810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) 847f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 848f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 849f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 8501fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 8511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 8521fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 8531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!FirstType->isObjCObjectPointerType() && 854a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 855dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 856d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 8573ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 8583ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian if (Second) { 8593ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian DefaultFunctionArrayConversion(Second); 8603ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 861f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 862dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 863d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 8643ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 865f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 866f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 867f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 8688189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 8698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 8703ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 8715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8724cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 8731b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 8745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 8754eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If we are in a block, reject all gotos for now. 8764eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 8774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); 8784eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff 8795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 880ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 8815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 882caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 883caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 8848189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 8854cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 8868189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 8875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8894cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 890ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 8914cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 892bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 89333083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman Expr* E = DestExp.takeAs<Expr>(); 8945f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 8955f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 8965f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 8975f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); 8985f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, 8995f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor E, "passing")) 9005f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 9015f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 9025f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 9035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9054cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9061b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 9075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 9085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 9104cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 9115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9124cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9138189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 9145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9164cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9171b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 9185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 9195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 9214cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 9225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9234cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9248189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 9255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 92727c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 9284eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 9294cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9304eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 9314eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 9324eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 9337d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 934c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 93516564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 93616564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 93716564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff DefaultFunctionArrayConversion(RetValExp); 9387d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 9397d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 9407d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 9417d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 9427d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 9437d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 9447d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 9457d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 946c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 9477d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 9484eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9497d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 9504cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 95140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 9526c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 9536c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 9546c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 9556c92fa75e62937f9738696840efcb258560f4568Mike Stump } 9566c92fa75e62937f9738696840efcb258560f4568Mike Stump 9574eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 9584eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 9594eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 9604eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 9614eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 9624eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 9638189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek RetValExp->Destroy(Context); 9644eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 9654eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9668189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9674eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 9684cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9694cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl if (!RetValExp) 9704cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 9714cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 97298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 97398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // we have a non-void block with an expression, continue checking 97498eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump QualType RetValType = RetValExp->getType(); 97598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 9761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 9771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 97898eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // function return. 9794cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 98098eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // In C++ the return statement is handled via a copy initialization. 98198eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // the C version of which boils down to CheckSingleAssignmentConstraints. 98298eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump // FIXME: Leaks RetValExp. 98398eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) 98498eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump return StmtError(); 98598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump 98698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 98798eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 9884cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9898189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 9904eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 9915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 992e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// IsReturnCopyElidable - Whether returning @p RetExpr from a function that 993e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl/// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). 994e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redlstatic bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, 995e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl Expr *RetExpr) { 996e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl QualType ExprType = RetExpr->getType(); 997e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with ... 998e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... a class return type ... 999e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!RetType->isRecordType()) 1000e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1001e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the same cv-unqualified type as the function return type ... 1002a4923eb7c4b04d360cb2747641a5e92818edf804Douglas Gregor if (!Ctx.hasSameUnqualifiedType(RetType, ExprType)) 1003e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1004e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // ... the expression is the name of a non-volatile automatic object ... 1005e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // We ignore parentheses here. 1006e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Is this compliant? 1007e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 1008e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!DR) 1009e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1010e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 1011e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl if (!VD) 1012e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return false; 1013e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl return VD->hasLocalStorage() && !VD->getType()->isReferenceType() 1014e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl && !VD->getType().isVolatileQualified(); 1015e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl} 1016e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 10174cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 1018f53b4433abb7a3bc14c0329d3175cbc291280137Anders CarlssonSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 1019f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson Expr *RetValExp = rex.takeAs<Expr>(); 10204eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock) 10214eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 10224cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1023371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1024f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1025371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 102640b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (FD->hasAttr<NoReturnAttr>()) 10278662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 1028f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 1029f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1030c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 1031c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 1032c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 10331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10345cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 10351be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor if (RetValExp && !RetValExp->isTypeDependent()) { 10361be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor // C99 6.8.6.4p1 (ext_ since GCC warns) 103765ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 103865ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 103965ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 10404cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1041e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 1042e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 1043e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 1044e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1045e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 1046e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 1047e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 1048e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 10491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1050f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 10515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10528189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 10535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10544cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 105503d77760a5db7990724b6901cea958a673ce0b39Anders Carlsson if (!RetValExp && !FnRetType->isDependentType()) { 10563c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 10573c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 10583c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 10593c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 10603c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 106108631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 10623c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 106308631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 10648189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); 10653c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner } 10664cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1067898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 1068898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // we have a non-void function with an expression, continue checking 10694cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 10701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.8.6.4p3(136): The return statement is not an assignment. The 10711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // overlap restriction of subclause 6.5.16.1 does not apply to the case of 10724cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // function return. 10734cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1074e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p15: When certain criteria are met, an implementation is 1075e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // allowed to omit the copy construction of a class object, [...] 1076e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // - in a return statement in a function with a class return type, when 1077e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the expression is the name of a non-volatile automatic object with 1078e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // the same cv-unqualified type as the function return type, the copy 1079e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // operation can be omitted [...] 1080e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // C++0x 12.8p16: When the criteria for elision of a copy operation are met 1081e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // and the object to be copied is designated by an lvalue, overload 1082e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // resolution to select the constructor for the copy is first performed 1083e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // as if the object were designated by an rvalue. 1084e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // Note that we only compute Elidable if we're in C++0x, since we don't 1085e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // care otherwise. 1086e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl bool Elidable = getLangOptions().CPlusPlus0x ? 1087e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl IsReturnCopyElidable(Context, FnRetType, RetValExp) : 1088e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl false; 1089e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl 1090898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor // In C++ the return statement is handled via a copy initialization. 10914cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl // the C version of which boils down to CheckSingleAssignmentConstraints. 1092e2b6833d445c7a4ce64f1816c05f176ba1740acaSebastian Redl // FIXME: Leaks RetValExp on error. 109366724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)){ 109466724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor // We should still clean up our temporaries, even when we're failing! 109566724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 10964cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(); 109766724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 109866724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor 1099898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1100898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 1101898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor 1102f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson if (RetValExp) 1103f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); 11048189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); 11055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 11065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1107810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1108810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1109810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1110810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1111810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1112810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1113810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 1114810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 1115810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 1116810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 1117810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1118810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 1119810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 1120810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 1121810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 1122810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 1123810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 1124810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1125810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 1126810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 1127810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1128810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 1129810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 1130810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 1131810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1132810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 1133810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 1134810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 1135810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1136810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 11373037ed0a27dba62e522304183718efc149e8b6d9Sebastian RedlSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 11383037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 11393037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 11403037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 11413037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 11423037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl std::string *Names, 11433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 11443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 11453037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl ExprArg asmString, 11463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 11473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl SourceLocation RParenLoc) { 11483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 11493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 11503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 11513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 11523037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 11533037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 11543037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 115503eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 11561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11571708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 11586bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 11593037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 11603037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 11613037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11621708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 11631708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 11646bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11653037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 11663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 11673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TargetInfo::ConstraintInfo Info(Literal->getStrData(), 11692819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 11702819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1171432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 11723037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1173432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1174432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 11753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1176d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 117772056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1178810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 117972056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1180dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 118172056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 118204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 118444def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 118504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 11863037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1187806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1188806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 118904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 11901708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 11916bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 11923037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 11933037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 11943037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 11951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TargetInfo::ConstraintInfo Info(Literal->getStrData(), 11962819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Literal->getByteLength(), 11972819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner Names[i]); 1198beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 11992819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 12003037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1201432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1202432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1203d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 12043037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 120572056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 12063037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1207d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 120844def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1209810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 121072056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1211d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1212432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 121372056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 121404728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 12153037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 121644def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1217d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 121872056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1219d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 12201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 122172056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1222d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1223d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 12241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12256032979a5d091e5607c7c467400449727d9beb5aAnders Carlsson DefaultFunctionArrayConversion(Exprs[i]); 12261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1227806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 122804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 12293037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12306fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 12311708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 12321708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 12336bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 12343037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 12353037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 12363037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12377765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar std::string Clobber(Literal->getStrData(), 12387765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar Literal->getStrData() + 12397765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar Literal->getByteLength()); 12403037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12416bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) 12423037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 12437765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 12446fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 12453037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl constraints.release(); 12473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl exprs.release(); 12483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl asmString.release(); 12493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl clobbers.release(); 1250fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1251fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, 1252fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Names, Constraints, Exprs, AsmString, NumClobbers, 1253fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner Clobbers, RParenLoc); 1254fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1255fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1256fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1257fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1258fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 12592ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 12602ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1261fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1262fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1263fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 12641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1265806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1266806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1267806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 12681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1269806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1270806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1271806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1272806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 12731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1274806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1275f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1276c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 12777adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 12787adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 12797adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1280806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 12811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12827adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // Int/ptr operands have some special cases that we allow. 12837adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if ((OutTy->isIntegerType() || OutTy->isPointerType()) && 12847adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner (InTy->isIntegerType() || InTy->isPointerType())) { 12851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12867adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // They are ok if they are the same size. Tying void* to int is ok if 12877adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // they are the same size, for example. This also allows tying void* to 12887adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner // int*. 12893351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 12903351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 12913351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (OutSize == InSize) 1292806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; 12931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12943351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 12953351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // then we can promote it and the asm string won't notice. Check this 1296f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner // case now. 12973351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner bool SmallerValueMentioned = false; 129858bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 129958bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 130058bce89d12b1dfba16637ce3754d6cb24c3099bbChris Lattner if (!Piece.isOperand()) continue; 13011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13023351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 13033351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 13043351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 13053351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize < OutSize) { 13063351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 13073351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 13083351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 13093351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 13103351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 13113351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If this is a reference to the input and if the input was the smaller 13123351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // one, then we have to reject this asm. 13133351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (Piece.getOperandNo() == TiedTo) { 13143351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (InSize > OutSize) { 13153351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner SmallerValueMentioned = true; 13163351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner break; 13173351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 13183351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1319f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 13201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13213351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 13223351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // output was a register, just extend the shorter one to the size of the 13233351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner // larger one. 13243351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner if (!SmallerValueMentioned && 1325f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1326f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner continue; 1327806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 13281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1329c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1330806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 13317adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1332806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1333806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1334806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1335806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 13361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1337fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1338fe795956194141c91ae555985c9b930595bff43fChris Lattner} 13393b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1340431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1341431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1342b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner SourceLocation RParen, DeclPtrTy Parm, 1343431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Body, StmtArg catchList) { 1344f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *CatchList = catchList.takeAs<Stmt>(); 1345b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); 13461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1347f50cb369273c6bd26c9629df92ee53f1d8af4149Steve Naroff // PVD == 0 implies @catch(...). 13489d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD) { 134993c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner // If we already know the decl is invalid, reject it. 135093c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner if (PVD->isInvalidDecl()) 135193c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner return StmtError(); 13521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1353f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!PVD->getType()->isObjCObjectPointerType()) 13541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return StmtError(Diag(PVD->getLocation(), 13559d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff diag::err_catch_param_not_objc_type)); 13569d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff if (PVD->getType()->isObjCQualifiedIdType()) 13571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return StmtError(Diag(PVD->getLocation(), 1358d198abae5938262e501a409e833bf01ca8b8253eSteve Naroff diag::err_illegal_qualifiers_on_catch_parm)); 13599d40ee50f8a013e5253101648092cf0daa76c335Steve Naroff } 136093c4945c9ead2d374fe3fc528e3017c7167265beChris Lattner 13618189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, 1362e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson PVD, Body.takeAs<Stmt>(), CatchList); 1363431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl return Owned(CatchList ? CatchList : CS); 13643b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 13653b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1366431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1367431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 13688189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 13698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(Body.release()))); 1370161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1371bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1372431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1373431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, 1374431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg Try, StmtArg Catch, StmtArg Finally) { 137538c5ebd7b1b65304c7b5c7b9bf3f9162df22e77dChris Lattner CurFunctionNeedsScopeChecking = true; 1376e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), 1377e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Catch.takeAs<Stmt>(), 1378e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Finally.takeAs<Stmt>())); 1379bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1380bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1381431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 13823dcfe10a6801eb52f4c20f1242bea0a3a98aa146Steve NaroffSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { 1383f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Expr *ThrowExpr = expr.takeAs<Expr>(); 13847151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!ThrowExpr) { 1385e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1386e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1387e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1388e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1389e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1390e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 13914ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 13927151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } else { 13937151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff QualType ThrowType = ThrowExpr->getType(); 13947151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff // Make sure the expression type is an ObjC pointer or "void *". 1395f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!ThrowType->isObjCObjectPointerType()) { 13966217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = ThrowType->getAs<PointerType>(); 13977151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff if (!PT || !PT->getPointeeType()->isVoidType()) 13984ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 13994ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff << ThrowExpr->getType() << ThrowExpr->getSourceRange()); 14007151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 14017151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff } 14027151bbb55c8a437073e42f74348c3fd5f1d5b410Steve Naroff return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); 140339f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1404bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1405431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1406431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 1407431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg SynchBody) { 140846c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner CurFunctionNeedsScopeChecking = true; 140946c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1410a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 1411a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 1412f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SyncExpr->getType()->isObjCObjectPointerType()) { 14136217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1414a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1415a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1416a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1417a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 14181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 1420e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchExpr.takeAs<Stmt>(), 1421e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchBody.takeAs<Stmt>())); 1422fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 14234b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 14244b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 14254b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 14264b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 1427b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris LattnerSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 14284b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 14294b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 14308189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1431b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 1432e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson HandlerBlock.takeAs<Stmt>())); 14334b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 14348351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1435c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1436c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1437c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1438c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1439c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1440c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1441c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 14420953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 14430953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 1444c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 14450953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 1446c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 14470953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 1448c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1449c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1450c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1451c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1453c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 14540953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 1455c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1457c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType getQualType() const { return t; } 1458c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1459c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1460c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1461c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1462c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1463c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 14648351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 14658351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 14668351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 14678351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 14688351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 14698351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 14708351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 14718351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 14728351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 14738351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1474c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 14751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 14778351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1478c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1479c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1480c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1481c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 14821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1483c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1484c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 14851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1486c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1487c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1488c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1489c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1490c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1491c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1492c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1493c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 14941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1495c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1496c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1497c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 14981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1499c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1500c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1501c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1502c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1503c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1504c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1505c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1506c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1508c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1509c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15108351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 15111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15128351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 15138351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 15148351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 15158351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 15168351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 15178351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1518972041f45bdf8df7ea447221292d7827466ba94bSebastian Redl CurFunctionNeedsScopeChecking = true; 15198351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 15208189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXTryStmt(TryLoc, 15218189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(TryBlock.release()), 15228189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek Handlers, NumHandlers)); 15238351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1524