SemaStmt.cpp revision 3c46e8db99196179b30e7ac5c20c4efd5f3926d7
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" 1518ef5e28a9a2677f8b1dce1fb2638d66e0a1621fDouglas Gregor#include "SemaInit.h" 1651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson#include "clang/AST/APValue.h" 17f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner#include "clang/AST/ASTContext.h" 18c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/AST/DeclObjC.h" 1984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/AST/ExprCXX.h" 20419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner#include "clang/AST/ExprObjC.h" 2116f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtObjC.h" 2216f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtCXX.h" 23209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall#include "clang/AST/TypeLoc.h" 2484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/Lex/Preprocessor.h" 256fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 26c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/STLExtras.h" 27c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/SmallVector.h" 285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 306b1d283fe879fb11d7ce7a69feecf66e77b0eaf3Anders CarlssonSema::OwningStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 316b1d283fe879fb11d7ce7a69feecf66e77b0eaf3Anders Carlsson Expr *E = expr->takeAs<Expr>(); 321b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 33c12c5bba6ceb6acd4e51e7a0fc03257da9cfd44eJohn McCall if (E->getType()->isObjCObjectType()) { 3416b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian if (LangOpts.ObjCNonFragileABI) 3516b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian Diag(E->getLocEnd(), diag::err_indirection_requires_nonfragile_object) 3616b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian << E->getType(); 3716b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian else 3816b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian Diag(E->getLocEnd(), diag::err_direct_interface_unsupported) 3916b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian << E->getType(); 4016b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian return StmtError(); 4116b10378a93e8644008289fd86c1caf737d1395cFariborz Jahanian } 42834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 43834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 44834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 45a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 46834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 47a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 51a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlSema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 528189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) NullStmt(SemiLoc)); 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 55682bf92db408a6cbc3d37b5496a99b6ef85041ecChris LattnerSema::OwningStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 56a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 57a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 5820401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 60682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 6120401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 66a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanianvoid Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { 67a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 68a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 69a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // If we have an invalid decl, just return. 70a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian if (DG.isNull() || !DG.isSingleDecl()) return; 71a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // suppress any potential 'unused variable' warning. 72a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DG.getSingleDecl()->setUsed(); 73a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian} 74a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 75636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 76754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 77636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 78636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 79636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 80636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 81636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 82df317bf71653eeb235da8337b1e8e790f9653aa4Mike Stump if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) 83636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 85419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 86419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 87419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 88419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 89419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner E = E->IgnoreParens(); 9009105f52b1f28cbb1374c27c3c70f5517e2c465dFariborz Jahanian if (isa<ObjCImplicitSetterGetterRefExpr>(E)) 91419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner DiagID = diag::warn_unused_property_expr; 92bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner 934dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor if (const CXXExprWithTemporaries *Temps = dyn_cast<CXXExprWithTemporaries>(E)) 944dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor E = Temps->getSubExpr(); 954dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor 96bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 970faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall if (E->getType()->isVoidType()) 980faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall return; 990faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall 100bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 101bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 102d20254f2875d0004c57ee766f258dbcee29f4841Nuno Lopes if (const Decl *FD = CE->getCalleeDecl()) { 103bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 104bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 105bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 106bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 107bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 108bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 109bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 110bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 111bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 112bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 113bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 114bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 115bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 116bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 117f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { 118f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian const ObjCMethodDecl *MD = ME->getMethodDecl(); 119f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 120f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 121f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian return; 122f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 123d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor } else if (const CXXFunctionalCastExpr *FC 124d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor = dyn_cast<CXXFunctionalCastExpr>(E)) { 125d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor if (isa<CXXConstructExpr>(FC->getSubExpr()) || 126d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) 127d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor return; 128f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 129209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // Diagnose "(void*) blah" as a typo for "(void) blah". 130209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { 131209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); 132209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall QualType T = TI->getType(); 133209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 134209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // We really do want to use the non-canonical type here. 135209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall if (T == Context.VoidPtrTy) { 136209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); 137209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 138209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall Diag(Loc, diag::warn_unused_voidptr) 139209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall << FixItHint::CreateRemoval(TL.getStarLoc()); 140209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall return; 141209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 142209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 143209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 14435e12c90c1b107a75c5615aa76fdbd403661aaa6Douglas Gregor DiagRuntimeBehavior(Loc, PDiag(DiagID) << R1 << R2); 145636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 146636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 147a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian RedlAction::OwningStmtResult 1481b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 149a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 150a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 151a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 152c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 153c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 154c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 155c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 156c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 157c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 158c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 159c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 160c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 161c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 162c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 163c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 1641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 165c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 1664afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 167c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 168c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 169c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 17098414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 17198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 172636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 173636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 17498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 1751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 176636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 17798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 178a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 1798189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 1805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 182117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 183117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlSema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, 184117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl SourceLocation DotDotDotLoc, ExprArg rhsval, 18524e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 186117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl assert((lhsval.get() != 0) && "missing expression in case statement"); 187117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 1891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // However, GCC allows any evaluatable integer expression. 190117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *LHSVal = static_cast<Expr*>(lhsval.get()); 1911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 192dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 19324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1956c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 196117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 197117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl Expr *RHSVal = static_cast<Expr*>(rhsval.get()); 198dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 199dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 200f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 201117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval = 0; 202117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 203117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 204bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 2058a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 20624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 2078a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 2085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 209117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl // Only now release the smart pointers. 210117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl lhsval.release(); 211117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl rhsval.release(); 212dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 213dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 214bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(CS); 215117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 2165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 21824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 21924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattnervoid Sema::ActOnCaseStmtBody(StmtTy *caseStmt, StmtArg subStmt) { 22024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 221f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 22224e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 22324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 22424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 225117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian RedlAction::OwningStmtResult 2261eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 227117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl StmtArg subStmt, Scope *CurScope) { 228f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 229117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 230bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 2310fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 232117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 2330fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 234117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 235dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 236bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(DS); 237117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 2385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 240de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 2411b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 242de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl SourceLocation ColonLoc, StmtArg subStmt) { 243f1b1d59a3f0650ab97b04235a14ae4549ca1c656Anders Carlsson Stmt *SubStmt = subStmt.takeAs<Stmt>(); 2445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 245ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[II]; 246de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 248caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 249caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 250de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 252de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 2545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 2555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 25608631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 2575f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 258de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 2595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 260de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 2625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 2635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 2640fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 265de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 2665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 268de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 26999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, DeclPtrTy CondVar, 270de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ThenVal, SourceLocation ElseLoc, 271de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg ElseVal) { 272a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson OwningExprResult CondResult(CondVal.release()); 2731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2748cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 27599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondVar.get()) { 27699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 277586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); 27899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 27999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2808cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 28199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 28299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 28399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2848cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor 285e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *thenStmt = ThenVal.takeAs<Stmt>(); 286754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 2875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2882d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2892d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2902d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2912d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 2921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!ElseVal.get()) { 2932d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2942d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2952d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2962d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 297754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *elseStmt = ElseVal.takeAs<Stmt>(); 298754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 2991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 300a99fad8ff134273fe85f2970c7d89133d1218900Anders Carlsson CondResult.release(); 30143dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, 30299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor thenStmt, ElseLoc, elseStmt)); 3035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 305f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 306f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 307f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 308f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 309f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 3101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 311f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 312f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 313f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 314f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 315f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 316f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 317f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor 318f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // If the input was signed and negative and the output is 319f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // unsigned, don't bother to warn: this is implementation-defined 320f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // behavior. 321f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 322f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 323f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 324f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 325f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 326b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 327f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 328b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 329f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 330d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 3311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 332f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 333f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 334f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 335b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 336f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 337f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 338f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 3392853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // We don't diagnose this overflow, because it is implementation-defined 3402853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // behavior. 3412853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 342f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 343f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 344f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 345f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 346f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3470471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3480471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3490471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3500471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3510471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3520471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3530e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3540e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3550e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3560e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3570471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3580471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3590471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3600471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3610471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3620471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3630471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 364764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 365764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 366764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 367764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 368764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 369764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 370764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 371764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 372764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 373764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 374764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 375764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 376764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 377764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 378ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// CmpEnumVals - Comparison predicate for sorting enumeration values. 379ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 380ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 381ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 382ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 383ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first < rhs.first; 384ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 385ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 386ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// EqEnumVals - Comparison preficate for uniqing enumeration values. 387ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 388ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 389ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 390ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 391ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first == rhs.first; 392ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 393ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 3945f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 3955f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 3965f04881eb025f61396d0555d8173730fe2759e0aChris Lattnerstatic QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { 3976907fbe758d23e1aec4c0a67e7b633d1d855feb4John McCall if (const CastExpr *ImplicitCast = dyn_cast<ImplicitCastExpr>(expr)) { 3985f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); 3995f04881eb025f61396d0555d8173730fe2759e0aChris Lattner QualType TypeBeforePromotion = ExprBeforePromotion->getType(); 4002ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (TypeBeforePromotion->isIntegralOrEnumerationType()) { 4015f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return TypeBeforePromotion; 4025f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 4035f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 4045f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 4055f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 4065f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 407586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas GregorAction::OwningStmtResult 408586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas GregorSema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, ExprArg Cond, 409586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor DeclPtrTy CondVar) { 410586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor VarDecl *ConditionVar = 0; 411586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor if (CondVar.get()) { 412586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 413eecf38f821fe8e113722096b77da7d68b26d28d1Douglas Gregor OwningExprResult CondE = CheckConditionVariable(ConditionVar, SourceLocation(), false); 414eecf38f821fe8e113722096b77da7d68b26d28d1Douglas Gregor if (CondE.isInvalid()) 415586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 416eecf38f821fe8e113722096b77da7d68b26d28d1Douglas Gregor 417eecf38f821fe8e113722096b77da7d68b26d28d1Douglas Gregor Cond = move(CondE); 418586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 419586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 420c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor if (!Cond.get()) 421586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 422586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 423c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor Expr *CondExpr = static_cast<Expr *>(Cond.get()); 424c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor OwningExprResult ConvertedCond 425c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor = ConvertToIntegralOrEnumerationType(SwitchLoc, move(Cond), 426c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_typecheck_statement_requires_integer), 427c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 428c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor << CondExpr->getSourceRange(), 429c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_explicit_conversion), 430c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::note_switch_conversion), 431c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_multiple_conversions), 4326bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(diag::note_switch_conversion), 4336bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(0)); 434c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor if (ConvertedCond.isInvalid()) 435c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor return StmtError(); 436c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor 437c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor CondExpr = ConvertedCond.takeAs<Expr>(); 438c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor 439586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor if (!CondVar.get()) { 440586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondExpr = MaybeCreateCXXExprWithTemporaries(CondExpr); 441586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor if (!CondExpr) 442586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 443586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 444586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 44543dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, CondExpr); 446586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor getSwitchStack().push_back(SS); 447586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return Owned(SS); 4487e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner} 4497e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner 450de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlAction::OwningStmtResult 451de307473448fb3cebcb4c10090728300b53bca03Sebastian RedlSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, 452de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl StmtArg Body) { 453e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Stmt *BodyStmt = Body.takeAs<Stmt>(); 454de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 455bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner SwitchStmt *SS = getSwitchStack().back(); 456de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); 457de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4589dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 4591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getSwitchStack().pop_back(); 460c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 461ff331c15729f7d4439d253c97f4d60f2a7ffd0c6Douglas Gregor if (SS->getCond() == 0) 462be724bab2ba7ad47aebced25e7c8ec551eb72d28Douglas Gregor return StmtError(); 463be724bab2ba7ad47aebced25e7c8ec551eb72d28Douglas Gregor 464f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 4650fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr *CondExprBeforePromotion = CondExpr; 46684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType CondTypeBeforePromotion = 46784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor GetTypeBeforeIntegralPromotion(CondExpr); 468de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4690de55e7e6b8a53c5d1f2e9a811fd0a4ea13ed5b0Douglas Gregor // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 4700de55e7e6b8a53c5d1f2e9a811fd0a4ea13ed5b0Douglas Gregor UsualUnaryConversions(CondExpr); 471a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 47284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SS->setCond(CondExpr); 47384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 4745f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 4755f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 4765f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 4775f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 4785f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 4795f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 4805f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 48112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 482acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // We have already converted the expression to an integral or enumeration 483acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // type, when we started the switch statement. If we don't have an 484acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // appropriate type now, just return an error. 485acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor if (!CondType->isIntegralOrEnumerationType()) 48612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 48712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 4882b334bb3126a67895813e49e6228dad4aec0b4d6Chris Lattner if (CondExpr->isKnownToHaveBooleanValue()) { 48912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 49012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 49112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 49212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 49312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 49412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 495c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 496de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 497f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 498f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 4991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 500dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 5011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 502dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 5035f04881eb025f61396d0555d8173730fe2759e0aChris Lattner : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); 5045f04881eb025f61396d0555d8173730fe2759e0aChris Lattner bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); 5051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 506f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 507f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 508f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 5090471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 5100471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 5111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 512f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 513ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; 514ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy CaseRanges; 5151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 516f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 5171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 518b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 5191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 520dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 521c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 5221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 523c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 524f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 525f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 5265f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 527de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 528f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 529390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 530390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 531390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 532b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 533c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 534f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 5351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 536f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 537f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 5381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 539f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 540f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 5411e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 542dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 543dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 544dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 545dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 546dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 5491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 550f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 551f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 552f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 553f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 5546c36be5b383875b490684bcf439d6d427298c1afChris Lattner 5551e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 5561e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 55773c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Lo, CondType, CastExpr::CK_IntegralCast); 5581e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 5591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 560b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 561dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 5621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 563dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 564dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 565dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 566dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 567f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 5681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 569b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 570f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 571f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 572b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 573dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 5740fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // If we don't have a default statement, check whether the 5750fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // condition is constant. 5760fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt ConstantCondValue; 5770fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool HasConstantCond = false; 5780fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool ShouldCheckConstantCond = false; 5790fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!HasDependentValue && !TheDefaultStmt) { 5800fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr::EvalResult Result; 5810fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall HasConstantCond = CondExprBeforePromotion->Evaluate(Result, Context); 5820fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (HasConstantCond) { 5830fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(Result.Val.isInt() && "switch condition evaluated to non-int"); 5840fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue = Result.Val.getInt(); 5850fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = true; 5860fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 5870fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(ConstantCondValue.getBitWidth() == CondWidth && 5880fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue.isSigned() == CondIsSigned); 5890fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 5900fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 5910fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 592dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 593dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 594dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 595dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 5960fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { 5970fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 5980fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CaseVals[i].first == ConstantCondValue) 5990fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 6000fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 6010fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { 602dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 6031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 6040fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall diag::err_duplicate_case) << CaseVals[i].first.toString(10); 6050fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CaseVals[i-1].second->getLHS()->getLocStart(), 606dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 607390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 608390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 609dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 610dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6116efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 612b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 6131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 614dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 615dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 616dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 617dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 618dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 619dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 6201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 621dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 622dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 623dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 6240fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt &LoVal = CaseRanges[i].first; 625dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 626dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 627dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 6281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 629dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 630dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 631dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 632dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 6331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 634dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 635dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 63673c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Hi, CondType, CastExpr::CK_IntegralCast); 637dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 6381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 6400fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (LoVal > HiVal) { 641dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 642dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 643dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 644dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 645dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 646dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 647dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6480fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 6490fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 6500fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall LoVal <= ConstantCondValue && 6510fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue <= HiVal) 6520fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 6530fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 654dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 6550471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 6561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 657dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 658dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 659dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 660dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 661dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 662dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 663dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 6641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 665dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 666dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 667dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 668dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 6691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 670dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 671dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 672dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 675dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 676dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 677dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 680dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 682dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 683dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 684dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 685dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 687dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 688dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 689dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 690dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 691dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 692dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 694dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 695dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 696dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 697dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 6981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 699dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 700390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 701390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 702dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 703dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7040471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 705b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 706ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 7070fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Complain if we have a constant condition and we didn't find a match. 7080fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && ShouldCheckConstantCond) { 7090fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: it would be nice if we printed enums as enums, chars as 7100fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // chars, etc. 7110fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) 7120fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ConstantCondValue.toString(10) 7130fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << CondExpr->getSourceRange(); 7140fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 7150fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7160fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Check to see if switch is over an Enum and handles all of its 7170fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // values. We don't need to do this if there's a default 7180fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // statement or if we have a constant condition. 7190fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // 7200fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: we might want to check whether case values are out of the 7210fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // enum even if we don't want to check whether all cases are handled. 72230ab37122300a5f6664b8ae2d0b43b4396eb6bcbDouglas Gregor const EnumType* ET = CondTypeBeforePromotion->getAs<EnumType>(); 723ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // If switch has default case, then ignore it. 7240fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && !TheDefaultStmt && !HasConstantCond && ET) { 725ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const EnumDecl *ED = ET->getDecl(); 726ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef llvm::SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> EnumValsTy; 727ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy EnumVals; 728ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 7290fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Gather all enum values, set their type and sort them, 7300fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // allowing easier comparison with CaseVals. 7310fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); 7320fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EDI != ED->enumerator_end(); EDI++) { 733ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Val = (*EDI)->getInitVal(); 734ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if(Val.getBitWidth() < CondWidth) 735ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor Val.extend(CondWidth); 7366623584c0ec508110d75572eef092bf98fedf3f4Douglas Gregor else if (Val.getBitWidth() > CondWidth) 7376623584c0ec508110d75572eef092bf98fedf3f4Douglas Gregor Val.trunc(CondWidth); 738ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor Val.setIsSigned(CondIsSigned); 739ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumVals.push_back(std::make_pair(Val, (*EDI))); 740ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 741ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); 7420fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EnumValsTy::iterator EIend = 7430fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); 744ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // See which case values aren't in enum 745ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy::const_iterator EI = EnumVals.begin(); 7460fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (CaseValsTy::const_iterator CI = CaseVals.begin(); 7470fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CI != CaseVals.end(); CI++) { 748ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (EI != EIend && EI->first < CI->first) 749ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI++; 750ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI == EIend || EI->first > CI->first) 7510fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 7520fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 753ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 754ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // See which of case ranges aren't in enum 755ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI = EnumVals.begin(); 7560fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); 7570fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall RI != CaseRanges.end() && EI != EIend; RI++) { 758ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (EI != EIend && EI->first < RI->first) 759ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI++; 760ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 761ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI == EIend || EI->first != RI->first) { 7620fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 7630fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 764ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 765ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 766ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 767ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (EI != EIend && EI->first < Hi) 768ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI++; 769ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI == EIend || EI->first != Hi) 7700fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) 7710fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 772ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 773ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Check which enum vals aren't in switch 774ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseValsTy::const_iterator CI = CaseVals.begin(); 775ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy::const_iterator RI = CaseRanges.begin(); 776ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI = EnumVals.begin(); 777ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; EI != EIend; EI++) { 778ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Drop unneeded case values 779ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt CIVal; 780ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (CI != CaseVals.end() && CI->first < EI->first) 781ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CI++; 782ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 783ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (CI != CaseVals.end() && CI->first == EI->first) 784ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor continue; 785ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 786ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Drop unneeded case ranges 787ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; RI != CaseRanges.end(); RI++) { 788ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 789ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI->first <= Hi) 790ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor break; 791ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 792ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 793ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (RI == CaseRanges.end() || EI->first < RI->first) 7940fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_cases) 7950fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << EI->second->getDeclName(); 796ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 797ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 798b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 799dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 800390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 801390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 802b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 803de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 804de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 805de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl Switch.release(); 806de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 8075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 809f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 81099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 81199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor DeclPtrTy CondVar, StmtArg Body) { 81299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult CondResult(Cond.release()); 81399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8145656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 81599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondVar.get()) { 81699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = CondVar.getAs<VarDecl>(); 817586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); 81899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 81999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 8205656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 82199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 82299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 82399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 82499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 825754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 826754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 8271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 82899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor CondResult.release(); 82943dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, 83043dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor bodyStmt, WhileLoc)); 8315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 833f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 834f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, 835989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 836989135901c750af61ef012b6b0a0368be415bc46Chris Lattner ExprArg Cond, SourceLocation CondRParen) { 837e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson Expr *condExpr = Cond.takeAs<Expr>(); 8381b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(condExpr && "ActOnDoStmt(): missing expression"); 839f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8405a881bb09928b7ade891efc680088aaad276f8d6John McCall if (CheckBooleanCondition(condExpr, DoLoc)) { 8419f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor Cond = condExpr; 8425a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 8439f3ca2a7747bd47f14d7693f333103fac29a24d2Douglas Gregor } 8445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 845586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor condExpr = MaybeCreateCXXExprWithTemporaries(condExpr); 846586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor if (!condExpr) 847586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 848586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 849754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson Stmt *bodyStmt = Body.takeAs<Stmt>(); 850754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(bodyStmt); 851754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 852f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Cond.release(); 853754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson return Owned(new (Context) DoStmt(bodyStmt, condExpr, DoLoc, 854989135901c750af61ef012b6b0a0368be415bc46Chris Lattner WhileLoc, CondRParen)); 8555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 857f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 858f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 85999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor StmtArg first, FullExprArg second, DeclPtrTy secondVar, 86099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 861f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 862f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 863f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8645921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 8655921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 866f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 867f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 868f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 8695921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 8705921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 8715921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 8725921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 8735921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 8745921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 8755921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 8765921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 8775921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 878ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 8795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 88099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 88199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor OwningExprResult SecondResult(second.release()); 88299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 88399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (secondVar.get()) { 88499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor ConditionVar = secondVar.getAs<VarDecl>(); 885586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); 88699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 88799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 88899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 88999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 89099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 89199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Stmt *Body = static_cast<Stmt*>(body.get()); 89299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8933af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 8943af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 895754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 896754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 897f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 898f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 89943dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) ForStmt(Context, First, 90043dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor SecondResult.takeAs<Expr>(), ConditionVar, 90143dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor Third, Body, ForLoc, LParenLoc, 90243dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor RParenLoc)); 9035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 905f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlAction::OwningStmtResult 906f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 907f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 908f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl StmtArg first, ExprArg second, 909f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation RParenLoc, StmtArg body) { 910f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *First = static_cast<Stmt*>(first.get()); 911f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Expr *Second = static_cast<Expr*>(second.get()); 912f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl Stmt *Body = static_cast<Stmt*>(body.get()); 91320552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 91420552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 91520552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 9167e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 917f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 918f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 919f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 9207e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 921f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 922f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 923f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 924f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 925248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 926248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 927f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 928f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 9291fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 930c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor Expr *FirstE = cast<Expr>(First); 931c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstE->isTypeDependent() && 932c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor FirstE->isLvalue(Context) != Expr::LV_Valid) 933f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 934f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 935f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 9361fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 9371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 9381fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 939c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstType->isDependentType() && 940c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor !FirstType->isObjCObjectPointerType() && 941a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 942dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 943d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 9443ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 945c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (Second && !Second->isTypeDependent()) { 946a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(Second); 9473ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 948f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 949dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 950d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 9513ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 952f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl first.release(); 953f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl second.release(); 954f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl body.release(); 9558189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 9568189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 9573ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 9585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9594cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9601b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 9615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 9625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 963ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 9645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 965caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 966caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 9678189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 9684cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9698189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 9705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9724cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 973ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 9744cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl ExprArg DestExp) { 975bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 97633083823342649b1fccec856c1f239c09fc0d7e1Eli Friedman Expr* E = DestExp.takeAs<Expr>(); 9775f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 9785f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 9792877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); 9805f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 9812877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth CheckSingleAssignmentConstraints(DestTy, E); 9822877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) 9835f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 9845f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 9855f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 9865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9884cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 9891b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 9905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 9915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 9934cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 9945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9954cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9968189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 9975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9994cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 10001b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 10015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 10025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 10035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 10044cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 10055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10064cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 10078189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 10085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 10105077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \brief Determine whether a return statement is a candidate for the named 10115077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// return value optimization (C++0x 12.8p34, bullet 1). 10125077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10135077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param Ctx The context in which the return expression and type occur. 10145077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10155077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param RetType The return type of the function or block. 10165077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10175077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param RetExpr The expression being returned from the function or block. 10185077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10195077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \returns The NRVO candidate variable, if the return statement may use the 10205077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// NRVO, or NULL if there is no such candidate. 10215077c3876beeaed32280af88244e8050078619a8Douglas Gregorstatic const VarDecl *getNRVOCandidate(ASTContext &Ctx, QualType RetType, 10225077c3876beeaed32280af88244e8050078619a8Douglas Gregor Expr *RetExpr) { 10233c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor QualType ExprType = RetExpr->getType(); 10243c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // - in a return statement in a function with ... 10253c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... a class return type ... 10263c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!RetType->isRecordType()) 10275077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10283c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... the same cv-unqualified type as the function return type ... 10293c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!Ctx.hasSameUnqualifiedType(RetType, ExprType)) 10305077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10313c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... the expression is the name of a non-volatile automatic object ... 10323c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // We ignore parentheses here. 10333c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // FIXME: Is this compliant? (Everyone else does it) 10343c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 10353c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!DR) 10365077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10373c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 10383c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!VD) 10395077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10405077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10415077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (VD->getKind() == Decl::Var && VD->hasLocalStorage() && 1042d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType()->isReferenceType() && !VD->hasAttr<BlocksAttr>() && 1043d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType().isVolatileQualified()) 10445077c3876beeaed32280af88244e8050078619a8Douglas Gregor return VD; 10455077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10465077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10473c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor} 10483c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor 104927c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 10504eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 10514cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 10524eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 10534eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 10544eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 10559ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor BlockScopeInfo *CurBlock = getCurBlock(); 10567d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 1057c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 105816564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 105916564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 1060a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(RetValExp); 10617d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 10627d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 10637d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 10647d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 10657d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 10667d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 10677d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 10687d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 1069c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 10707d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 10714eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 10727d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 10734cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 107440b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 10756c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 10766c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 10776c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 10786c92fa75e62937f9738696840efcb258560f4568Mike Stump } 10796c92fa75e62937f9738696840efcb258560f4568Mike Stump 10804eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 10814eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 10824eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 10835077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 10844eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 10854eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 10864eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 10874eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 10884eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 10895077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 10905077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp) { 10914cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 10925077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 10935077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 10945077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10955077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 10965077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void block with an expression, continue checking 10975077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10985077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 10995077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 11005077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 11015077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11025077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 11035077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 11045077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate = getNRVOCandidate(Context, FnRetType, RetValExp); 11055077c3876beeaed32280af88244e8050078619a8Douglas Gregor OwningExprResult Res = PerformCopyInitialization( 11065077c3876beeaed32280af88244e8050078619a8Douglas Gregor InitializedEntity::InitializeResult(ReturnLoc, 11075077c3876beeaed32280af88244e8050078619a8Douglas Gregor FnRetType, 11085077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate != 0), 11095077c3876beeaed32280af88244e8050078619a8Douglas Gregor SourceLocation(), 11105077c3876beeaed32280af88244e8050078619a8Douglas Gregor Owned(RetValExp)); 11115077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 11125077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 11135077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 11145077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 11155077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11165077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11175077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11184cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11195077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 11205077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11215077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1122c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson } 1123c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson 11245077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 112598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 11264cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11275077c3876beeaed32280af88244e8050078619a8Douglas Gregor // If we need to check for the named return value optimization, save the 11285077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 11295077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 11305077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 11315077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 11325077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11335077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 11344eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 11355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 11364cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian RedlAction::OwningStmtResult 1137f53b4433abb7a3bc14c0329d3175cbc291280137Anders CarlssonSema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { 1138f53b4433abb7a3bc14c0329d3175cbc291280137Anders Carlsson Expr *RetValExp = rex.takeAs<Expr>(); 11399ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor if (getCurBlock()) 11404eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 11414cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1142371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1143f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1144371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 114504a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall if (FD->hasAttr<NoReturnAttr>() || 114604a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) 11478662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 1148f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 1149f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1150c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 1151c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 1152c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 11531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11545077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 11555cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 11561be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor if (RetValExp && !RetValExp->isTypeDependent()) { 11571be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor // C99 6.8.6.4p1 (ext_ since GCC warns) 115865ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 115965ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 116065ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 11614cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1162e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 1163e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 1164e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 1165e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1166e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 1167e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 1168e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 1169e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 11701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11710ece491d8f62ce67f047491a6703fac0d3bd4ff4Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 11735077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11745077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 11755077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp && !FnRetType->isDependentType()) { 11763c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 11773c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 11783c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 11793c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 11803c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 118108631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 11823c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 118308631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 11845077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc); 11855077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 11865077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 11875077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 11885077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void function with an expression, continue checking 11895077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11905077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 11915077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 11925077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 11935077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11945077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 11955077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 11965077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate = getNRVOCandidate(Context, FnRetType, RetValExp); 11975077c3876beeaed32280af88244e8050078619a8Douglas Gregor OwningExprResult Res = PerformCopyInitialization( 11985077c3876beeaed32280af88244e8050078619a8Douglas Gregor InitializedEntity::InitializeResult(ReturnLoc, 11995077c3876beeaed32280af88244e8050078619a8Douglas Gregor FnRetType, 12005077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate != 0), 12015077c3876beeaed32280af88244e8050078619a8Douglas Gregor SourceLocation(), 12025077c3876beeaed32280af88244e8050078619a8Douglas Gregor Owned(RetValExp)); 12035077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 12045077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 12055077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 12065077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 12074cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 12085077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 12095077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 12105077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 121166724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 12125077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12135077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 12145077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 12155077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 1216898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 12175077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12185077c3876beeaed32280af88244e8050078619a8Douglas Gregor // If we need to check for the named return value optimization, save the 12195077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 12205077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 12215077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 12225077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 12235077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12245077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 12255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 12265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1227810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1228810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1229810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1230810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1231810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1232810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1233810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 1234810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 1235703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson // Type dependent expressions will be checked during instantiation. 1236703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson if (E->isTypeDependent()) 1237703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson return false; 1238703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson 1239810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 1240810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 1241810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1242810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 1243810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 1244810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 1245810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 1246810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 1247810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 1248810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1249810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 1250810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 1251810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1252810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 1253810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 1254810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 1255810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1256810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 1257810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 1258810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 1259810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1260810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 12613037ed0a27dba62e522304183718efc149e8b6d9Sebastian RedlSema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 12623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 12633037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 12643037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 12653037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 1266ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson IdentifierInfo **Names, 12673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 12683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 12693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl ExprArg asmString, 12703037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 12713b11fd3b52e7b88233c602407c151d07cb093e75Mike Stump SourceLocation RParenLoc, 12723b11fd3b52e7b88233c602407c151d07cb093e75Mike Stump bool MSAsm) { 12733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 12743037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 12753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 12763037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); 12773037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); 12783037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 12793037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 128003eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 12811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12821708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 12836bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 12843037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 12853037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 12863037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12871708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 12881708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 12896bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 12903037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 12913037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 12923037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1293ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson llvm::StringRef OutputName; 1294ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 1295ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson OutputName = Names[i]->getName(); 1296ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 1297ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); 1298432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 12993037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1300432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1301432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 13023037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1303d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 130472056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1305810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 130672056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1307dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 130872056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 130904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 131144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 131204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13133037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1314806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1315806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 131604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 13171708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 13186bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 13193037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 13203037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 13213037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1322ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson llvm::StringRef InputName; 1323ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 1324ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson InputName = Names[i]->getName(); 1325ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 1326ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); 1327beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 13282819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 13293037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1330432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1331432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1332d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 13333037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 133472056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 13353037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1336d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 133744def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1338810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 133972056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1340d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1341432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 134272056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 134304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 134544def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1346d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 134772056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1348d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 13491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 135072056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1351d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1352d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 13531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1354a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(Exprs[i]); 13551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1356806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 135704728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13583037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 13596fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 13601708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 13611708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 13626bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 13633037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 13643037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 13653037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1366fdba9c069023f686e2608affde02c82131ee1cf8Anders Carlsson llvm::StringRef Clobber = Literal->getString(); 13673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1368fdba9c069023f686e2608affde02c82131ee1cf8Anders Carlsson if (!Context.Target.isValidGCCRegisterName(Clobber)) 13693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 13707765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 13716fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 13723037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 13733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl constraints.release(); 13743037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl exprs.release(); 13753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl asmString.release(); 13763037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl clobbers.release(); 1377fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1378966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, 1379966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson NumOutputs, NumInputs, Names, Constraints, Exprs, 1380966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson AsmString, NumClobbers, Clobbers, RParenLoc); 1381fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1382fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1383fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1384fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1385fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 13862ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 13872ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1388fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1389fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1390fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 13911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1392806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1393806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1394806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 13951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1396806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1397806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1398806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1399806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 14001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1401806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1402f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1403c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 14047adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 14057adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 14067adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1407806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 14081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1409aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Decide if the input and output are in the same domain (integer/ptr or 1410aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // floating point. 1411aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner enum AsmDomain { 1412aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AD_Int, AD_FP, AD_Other 1413aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } InputDomain, OutputDomain; 1414aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1415aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InTy->isIntegerType() || InTy->isPointerType()) 1416aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Int; 14170c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (InTy->isRealFloatingType()) 1418aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_FP; 1419aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1420aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Other; 14213351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 1422aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutTy->isIntegerType() || OutTy->isPointerType()) 1423aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Int; 14240c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (OutTy->isRealFloatingType()) 1425aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_FP; 1426aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1427aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Other; 1428aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1429aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // They are ok if they are the same size and in the same domain. This 1430aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // allows tying things like: 1431aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int* 1432aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int if they are the same size. 1433aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // double to long double if they are the same size. 1434aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // 1435aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 1436aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 1437aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutSize == InSize && InputDomain == OutputDomain && 1438aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain != AD_Other) 1439aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 1440aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1441aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 1442aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // then we can promote it and the asm string won't notice. Check this 1443aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // case now. 1444aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner bool SmallerValueMentioned = false; 1445aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 1446aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 1447aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!Piece.isOperand()) continue; 1448aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1449aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If this is a reference to the input and if the input was the smaller 1450aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // one, then we have to reject this asm. 1451aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 1452aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InSize < OutSize) { 1453aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner SmallerValueMentioned = true; 1454aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner break; 14553351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1456f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 14571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1458aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If this is a reference to the input and if the input was the smaller 1459aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // one, then we have to reject this asm. 1460aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Piece.getOperandNo() == TiedTo) { 1461aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InSize > OutSize) { 1462aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner SmallerValueMentioned = true; 1463aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner break; 1464aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } 1465aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } 1466806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 14671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1468aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 1469aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // output was a register, just extend the shorter one to the size of the 1470aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // larger one. 1471aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!SmallerValueMentioned && InputDomain != AD_Other && 1472aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1473aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 1474aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1475c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1476806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 14777adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1478806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1479806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1480806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1481806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 14821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1483fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1484fe795956194141c91ae555985c9b930595bff43fChris Lattner} 14853b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1486431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1487431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1488b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner SourceLocation RParen, DeclPtrTy Parm, 14898f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor StmtArg Body) { 1490160b5630aa781ac348303e1ae088d27016637778Douglas Gregor VarDecl *Var = cast_or_null<VarDecl>(Parm.getAs<Decl>()); 1491160b5630aa781ac348303e1ae088d27016637778Douglas Gregor if (Var && Var->isInvalidDecl()) 1492160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return StmtError(); 1493160b5630aa781ac348303e1ae088d27016637778Douglas Gregor 1494160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, 14958f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor Body.takeAs<Stmt>())); 14963b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 14973b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 1498431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1499431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { 15008189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, 15018189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek static_cast<Stmt*>(Body.release()))); 1502161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1503bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1504431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 15058f5e3dd32e443768d9dbbad7191e123e6733750cDouglas GregorSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, StmtArg Try, 15068f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor MultiStmtArg CatchStmts, StmtArg Finally) { 15079ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor FunctionNeedsScopeChecking() = true; 15088f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor unsigned NumCatchStmts = CatchStmts.size(); 15098f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try.takeAs<Stmt>(), 15108f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor (Stmt **)CatchStmts.release(), 15118f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor NumCatchStmts, 15128f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor Finally.takeAs<Stmt>())); 1513bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1514bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1515d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas GregorSema::OwningStmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, 1516d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor ExprArg ThrowE) { 1517d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Expr *Throw = static_cast<Expr *>(ThrowE.get()); 1518d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (Throw) { 1519d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor QualType ThrowType = Throw->getType(); 1520d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor // Make sure the expression type is an ObjC pointer or "void *". 1521d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!ThrowType->isDependentType() && 1522d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor !ThrowType->isObjCObjectPointerType()) { 1523d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor const PointerType *PT = ThrowType->getAs<PointerType>(); 1524d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!PT || !PT->getPointeeType()->isVoidType()) 1525d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 1526d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor << Throw->getType() << Throw->getSourceRange()); 1527d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1528d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1529d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 1530d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowE.takeAs<Expr>())); 1531d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor} 1532d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 1533431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1534d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas GregorSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg Throw, 1535d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Scope *CurScope) { 1536d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!Throw.get()) { 1537e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1538e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1539e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1540e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1541e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1542e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 15434ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 1544d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1545d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 1546d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return BuildObjCAtThrowStmt(AtLoc, move(Throw)); 154739f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1548bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 1549431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlAction::OwningStmtResult 1550431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, 1551431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian Redl StmtArg SynchBody) { 15529ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor FunctionNeedsScopeChecking() = true; 155346c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1554a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 1555a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); 15568fdc13a78a43f09ac396e682c35d57ca0b48216dDouglas Gregor if (!SyncExpr->getType()->isDependentType() && 15578fdc13a78a43f09ac396e682c35d57ca0b48216dDouglas Gregor !SyncExpr->getType()->isObjCObjectPointerType()) { 15586217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1559a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1560a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1561a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1562a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 15631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, 1565e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchExpr.takeAs<Stmt>(), 1566e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson SynchBody.takeAs<Stmt>())); 1567fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 15684b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 15694b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 15704b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 15714b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian RedlAction::OwningStmtResult 1572b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris LattnerSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, 15734b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl StmtArg HandlerBlock) { 15744b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 15758189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1576b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2Chris Lattner cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), 1577e9146f2e9f1c4e281544e8c080934c72d41012caAnders Carlsson HandlerBlock.takeAs<Stmt>())); 15784b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 15798351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 15803c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 15813c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 1582c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1583c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1584c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1585c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1586c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1587c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1588c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 15890953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 15900953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 1591c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 15920953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 1593c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 15940953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 1595c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1596c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1597c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1598c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1600c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 16010953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 1602c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1604c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType getQualType() const { return t; } 1605c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1606c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1607c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1608c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1609c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1610c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 16113c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 16123c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 16138351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 16148351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 16158351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlAction::OwningStmtResult 16168351da06ca3082dfd49dd8e3c1785a986920f57cSebastian RedlSema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, 16178351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 16188351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 16198351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 16208351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 16218351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); 16228351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1623c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 16241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 16268351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1627c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1628c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1629c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1630c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 16311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1632c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1633c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1635c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1636c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1637c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1638c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1639c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1640c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1641c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1642c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 16431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1644c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1645c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1646c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 16471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1648c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1649c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1650c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1651c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1652c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1653c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1654c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1655c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1657c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1658c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16598351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 16601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16618351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 16628351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 16638351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 16648351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 16658351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 16668351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 16679ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor FunctionNeedsScopeChecking() = true; 16688351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl RawHandlers.release(); 1669a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig return Owned(CXXTryStmt::Create(Context, TryLoc, 1670a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig static_cast<Stmt*>(TryBlock.release()), 1671a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig Handlers, NumHandlers)); 16728351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1673