SemaStmt.cpp revision 60d7b3a319d84d688752be3870615ac0f111fb16
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 14e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Sema.h" 15e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Initialization.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 3060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 319ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E = expr.get(); 321b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 33834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 34834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 35834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 36a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 37834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 38a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 438189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) NullStmt(SemiLoc)); 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 47a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 48a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 4920401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 51682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 5220401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 57a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanianvoid Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { 58a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 59a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 60a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // If we have an invalid decl, just return. 61a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian if (DG.isNull() || !DG.isSingleDecl()) return; 62a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // suppress any potential 'unused variable' warning. 63a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DG.getSingleDecl()->setUsed(); 64a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian} 65a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 66636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 67754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 68636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 69636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 70636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 71636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 72636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 73df317bf71653eeb235da8337b1e8e790f9653aa4Mike Stump if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) 74636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 76419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 77419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 78419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 79419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 80419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner E = E->IgnoreParens(); 8109105f52b1f28cbb1374c27c3c70f5517e2c465dFariborz Jahanian if (isa<ObjCImplicitSetterGetterRefExpr>(E)) 82419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner DiagID = diag::warn_unused_property_expr; 83bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner 844dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor if (const CXXExprWithTemporaries *Temps = dyn_cast<CXXExprWithTemporaries>(E)) 854dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor E = Temps->getSubExpr(); 864dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor 87bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 880faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall if (E->getType()->isVoidType()) 890faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall return; 900faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall 91bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 92bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 93d20254f2875d0004c57ee766f258dbcee29f4841Nuno Lopes if (const Decl *FD = CE->getCalleeDecl()) { 94bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 95bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 96bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 97bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 98bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 99bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 100bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 101bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 102bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 103bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 104bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 105bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 106bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 107bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 108f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { 109f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian const ObjCMethodDecl *MD = ME->getMethodDecl(); 110f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 111f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 112f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian return; 113f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 114d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor } else if (const CXXFunctionalCastExpr *FC 115d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor = dyn_cast<CXXFunctionalCastExpr>(E)) { 116d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor if (isa<CXXConstructExpr>(FC->getSubExpr()) || 117d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) 118d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor return; 119f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 120209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // Diagnose "(void*) blah" as a typo for "(void) blah". 121209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { 122209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); 123209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall QualType T = TI->getType(); 124209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 125209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // We really do want to use the non-canonical type here. 126209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall if (T == Context.VoidPtrTy) { 127209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); 128209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 129209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall Diag(Loc, diag::warn_unused_voidptr) 130209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall << FixItHint::CreateRemoval(TL.getStarLoc()); 131209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall return; 132209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 133209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 134209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 13535e12c90c1b107a75c5615aa76fdbd403661aaa6Douglas Gregor DiagRuntimeBehavior(Loc, PDiag(DiagID) << R1 << R2); 136636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 137636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 13860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1391b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 140a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 141a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 142a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 143c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 144c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 145c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 146c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 147c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 148c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 149c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 150c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 151c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 152c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 153c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 154c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 1551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 156c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 1574afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 158c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 159c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 160c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 16198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 16298414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 163636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 164636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 16598414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 1661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 167636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 16898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 169a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 1708189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 1715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 17360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1749ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, 1759ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation DotDotDotLoc, Expr *RHSVal, 17624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 1779ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert((LHSVal != 0) && "missing expression in case statement"); 178117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 1801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // However, GCC allows any evaluatable integer expression. 1811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 182dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 18324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1856c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 186117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 187dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 188dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 189f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 190117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 191117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 192bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 1938a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 19424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1958a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 1965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 197dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 198dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 199bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(CS); 200117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 2015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 20324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 2049ae2f076ca5ab1feb3ba95629099ec2319833701John McCallvoid Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { 20524e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 20624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 20724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 20824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 20960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2101eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 2119ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SubStmt, Scope *CurScope) { 212bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner if (getSwitchStack().empty()) { 2130fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 214117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 2150fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 216117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 217dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 218bcfce66584e47bb07f49a86b7cb39b4fdd269a5aChris Lattner getSwitchStack().back()->addSwitchCase(DS); 219117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 2205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 22260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2231b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 2249ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation ColonLoc, Stmt *SubStmt) { 2255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 226ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[II]; 227de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 229caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 230caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 231de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 233de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 2355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 2365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 23708631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 2385f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 239de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 2405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 241de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 2435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 2445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 2450fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 246de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 2475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 24960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 250d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, 2519ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *thenStmt, SourceLocation ElseLoc, 2529ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *elseStmt) { 25360d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(CondVal.release()); 2541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2558cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 256d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 257d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 258586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); 25999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 26099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2618cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 26299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 26399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 26499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2658cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor 266754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 2675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2682d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2692d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2702d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2712d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 2729ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!elseStmt) { 2732d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2742d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2752d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2762d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 277754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 2781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 27943dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, 28099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor thenStmt, ElseLoc, elseStmt)); 2815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 283f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 284f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 285f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 286f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 287f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 2881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 289f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 290f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 291f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 292f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 293f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 294f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 295f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor 296f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // If the input was signed and negative and the output is 297f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // unsigned, don't bother to warn: this is implementation-defined 298f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // behavior. 299f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 300f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 301f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 302f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 303f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 304b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 305f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 306b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 307f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 308d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 3091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 310f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 311f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 312f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 313b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 314f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 315f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 316f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 3172853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // We don't diagnose this overflow, because it is implementation-defined 3182853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // behavior. 3192853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 320f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 321f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 322f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 323f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 324f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3250471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3260471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3270471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3280471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3290471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3300471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3310e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3320e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3330e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3340e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3350471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3360471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3370471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3380471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3390471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3400471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3410471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 342764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 343764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 344764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 345764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 346764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 347764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 348764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 349764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 350764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 351764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 352764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 353764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 354764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 355764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 356ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// CmpEnumVals - Comparison predicate for sorting enumeration values. 357ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 358ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 359ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 360ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 361ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first < rhs.first; 362ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 363ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 364ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// EqEnumVals - Comparison preficate for uniqing enumeration values. 365ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 366ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 367ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 368ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 369ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first == rhs.first; 370ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 371ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 3725f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 3735f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 3745f04881eb025f61396d0555d8173730fe2759e0aChris Lattnerstatic QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { 3756907fbe758d23e1aec4c0a67e7b633d1d855feb4John McCall if (const CastExpr *ImplicitCast = dyn_cast<ImplicitCastExpr>(expr)) { 3765f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); 3775f04881eb025f61396d0555d8173730fe2759e0aChris Lattner QualType TypeBeforePromotion = ExprBeforePromotion->getType(); 3782ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (TypeBeforePromotion->isIntegralOrEnumerationType()) { 3795f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return TypeBeforePromotion; 3805f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3815f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3825f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 3835f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 3845f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 38560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 3869ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, 387d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall Decl *CondVar) { 38860d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult; 3899ae2f076ca5ab1feb3ba95629099ec2319833701John McCall 390586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor VarDecl *ConditionVar = 0; 391d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 392d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 3939ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); 3949ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 395586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 396eecf38f821fe8e113722096b77da7d68b26d28d1Douglas Gregor 3979ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.release(); 398586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 399586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 4009ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Cond) 401586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 402586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 4039ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult 4049ae2f076ca5ab1feb3ba95629099ec2319833701John McCall = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, 405c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_typecheck_statement_requires_integer), 406c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 4079ae2f076ca5ab1feb3ba95629099ec2319833701John McCall << Cond->getSourceRange(), 408c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_explicit_conversion), 409c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::note_switch_conversion), 410c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_multiple_conversions), 4116bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(diag::note_switch_conversion), 4126bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(0)); 4139ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) return StmtError(); 4149ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 415c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor 416d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (!CondVar) { 4179ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = MaybeCreateCXXExprWithTemporaries(Cond); 4189ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 419586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 4209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 421586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 422b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 423b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall setFunctionHasBranchIntoScope(); 424586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 4259ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); 426586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor getSwitchStack().push_back(SS); 427586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return Owned(SS); 4287e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner} 4297e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner 43060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 4319ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, 4329ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *BodyStmt) { 4339ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = cast<SwitchStmt>(Switch); 4349ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert(SS == getSwitchStack().back() && "switch stack missing push/pop!"); 435de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4369dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 4371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getSwitchStack().pop_back(); 438c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 439ff331c15729f7d4439d253c97f4d60f2a7ffd0c6Douglas Gregor if (SS->getCond() == 0) 440be724bab2ba7ad47aebced25e7c8ec551eb72d28Douglas Gregor return StmtError(); 441be724bab2ba7ad47aebced25e7c8ec551eb72d28Douglas Gregor 442f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 4430fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr *CondExprBeforePromotion = CondExpr; 44484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType CondTypeBeforePromotion = 44584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor GetTypeBeforeIntegralPromotion(CondExpr); 446de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4470de55e7e6b8a53c5d1f2e9a811fd0a4ea13ed5b0Douglas Gregor // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 4480de55e7e6b8a53c5d1f2e9a811fd0a4ea13ed5b0Douglas Gregor UsualUnaryConversions(CondExpr); 449a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 45084fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SS->setCond(CondExpr); 45184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 4525f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 4535f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 4545f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 4555f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 4565f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 4575f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 4585f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 45912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 460acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // We have already converted the expression to an integral or enumeration 461acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // type, when we started the switch statement. If we don't have an 462acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // appropriate type now, just return an error. 463acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor if (!CondType->isIntegralOrEnumerationType()) 46412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 46512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 4662b334bb3126a67895813e49e6228dad4aec0b4d6Chris Lattner if (CondExpr->isKnownToHaveBooleanValue()) { 46712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 46812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 46912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 47012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 47112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 47212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 473c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 474de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 475f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 476f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 4771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 478dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 4791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 480dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 4815f04881eb025f61396d0555d8173730fe2759e0aChris Lattner : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); 4825f04881eb025f61396d0555d8173730fe2759e0aChris Lattner bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); 4831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 484f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 485f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 486f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 4870471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 4880471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 4891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 490f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 491ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; 492ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy CaseRanges; 4931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 494f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 4951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 496b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 4971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 498dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 499c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 5001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 501c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 502f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 503f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 5045f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 505de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 506f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 507390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 508390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 509390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 510b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 511c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 512f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 5131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 514f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 515f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 5161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 517f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 518f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 5191e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 520dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 521dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 522dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 523dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 524dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 52651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 5271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 528f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 529f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 530f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 531f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 5326c36be5b383875b490684bcf439d6d427298c1afChris Lattner 5331e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 5341e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 53573c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Lo, CondType, CastExpr::CK_IntegralCast); 5361e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 5371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 538b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 539dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 5401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 541dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 542dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 543dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 544dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 545f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 5461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 547b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 548f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 549f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 550b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 551dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 5520fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // If we don't have a default statement, check whether the 5530fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // condition is constant. 5540fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt ConstantCondValue; 5550fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool HasConstantCond = false; 5560fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool ShouldCheckConstantCond = false; 5570fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!HasDependentValue && !TheDefaultStmt) { 5580fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr::EvalResult Result; 5590fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall HasConstantCond = CondExprBeforePromotion->Evaluate(Result, Context); 5600fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (HasConstantCond) { 5610fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(Result.Val.isInt() && "switch condition evaluated to non-int"); 5620fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue = Result.Val.getInt(); 5630fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = true; 5640fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 5650fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(ConstantCondValue.getBitWidth() == CondWidth && 5660fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue.isSigned() == CondIsSigned); 5670fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 5680fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 5690fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 570dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 571dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 572dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 573dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 5740fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { 5750fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 5760fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CaseVals[i].first == ConstantCondValue) 5770fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 5780fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 5790fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { 580dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 5811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 5820fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall diag::err_duplicate_case) << CaseVals[i].first.toString(10); 5830fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CaseVals[i-1].second->getLHS()->getLocStart(), 584dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 585390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 586390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 587dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 588dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5896efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 590b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 5911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 592dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 593dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 594dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 595dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 596dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 597dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 5981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 599dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 600dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 601dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 6020fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt &LoVal = CaseRanges[i].first; 603dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 604dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 605dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 6061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 607dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 608dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 609dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 610dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 6111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 612dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 613dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 61473c39abdbb79927605d740c93dd9629e3e4f9bfeEli Friedman ImpCastExprToType(Hi, CondType, CastExpr::CK_IntegralCast); 615dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 6161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 617dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 6180fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (LoVal > HiVal) { 619dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 620dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 621dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 622dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 623dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 624dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 625dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6260fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 6270fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 6280fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall LoVal <= ConstantCondValue && 6290fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue <= HiVal) 6300fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 6310fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 632dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 6330471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 6341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 635dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 636dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 637dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 638dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 640dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 641dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 6421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 643dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 644dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 645dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 646dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 6471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 648dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 649dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 650dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 651dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 652dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 653dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 654dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 655dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 656dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 658dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 659dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 660dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 661dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 662dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 663dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 665dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 666dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 667dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 668dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 669dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 670dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 672dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 675dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 6761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 677dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 678390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 679390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 680dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6820471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 683b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 684ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 6850fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Complain if we have a constant condition and we didn't find a match. 6860fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && ShouldCheckConstantCond) { 6870fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: it would be nice if we printed enums as enums, chars as 6880fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // chars, etc. 6890fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) 6900fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ConstantCondValue.toString(10) 6910fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << CondExpr->getSourceRange(); 6920fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 6930fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 6940fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Check to see if switch is over an Enum and handles all of its 6950fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // values. We don't need to do this if there's a default 6960fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // statement or if we have a constant condition. 6970fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // 6980fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: we might want to check whether case values are out of the 6990fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // enum even if we don't want to check whether all cases are handled. 70030ab37122300a5f6664b8ae2d0b43b4396eb6bcbDouglas Gregor const EnumType* ET = CondTypeBeforePromotion->getAs<EnumType>(); 701ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // If switch has default case, then ignore it. 7020fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && !TheDefaultStmt && !HasConstantCond && ET) { 703ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const EnumDecl *ED = ET->getDecl(); 704ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef llvm::SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> EnumValsTy; 705ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy EnumVals; 706ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 7070fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Gather all enum values, set their type and sort them, 7080fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // allowing easier comparison with CaseVals. 7090fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); 7100fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EDI != ED->enumerator_end(); EDI++) { 711ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Val = (*EDI)->getInitVal(); 712ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if(Val.getBitWidth() < CondWidth) 713ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor Val.extend(CondWidth); 7146623584c0ec508110d75572eef092bf98fedf3f4Douglas Gregor else if (Val.getBitWidth() > CondWidth) 7156623584c0ec508110d75572eef092bf98fedf3f4Douglas Gregor Val.trunc(CondWidth); 716ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor Val.setIsSigned(CondIsSigned); 717ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumVals.push_back(std::make_pair(Val, (*EDI))); 718ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 719ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); 7200fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EnumValsTy::iterator EIend = 7210fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); 722ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // See which case values aren't in enum 723ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy::const_iterator EI = EnumVals.begin(); 7240fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (CaseValsTy::const_iterator CI = CaseVals.begin(); 7250fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CI != CaseVals.end(); CI++) { 726ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (EI != EIend && EI->first < CI->first) 727ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI++; 728ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI == EIend || EI->first > CI->first) 7290fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 7300fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 731ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 732ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // See which of case ranges aren't in enum 733ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI = EnumVals.begin(); 7340fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); 7350fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall RI != CaseRanges.end() && EI != EIend; RI++) { 736ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (EI != EIend && EI->first < RI->first) 737ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI++; 738ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 739ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI == EIend || EI->first != RI->first) { 7400fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 7410fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 742ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 743ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 744ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 745ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (EI != EIend && EI->first < Hi) 746ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI++; 747ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI == EIend || EI->first != Hi) 7480fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) 7490fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 750ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 751ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Check which enum vals aren't in switch 752ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseValsTy::const_iterator CI = CaseVals.begin(); 753ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy::const_iterator RI = CaseRanges.begin(); 754ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EI = EnumVals.begin(); 755ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; EI != EIend; EI++) { 756ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Drop unneeded case values 757ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt CIVal; 758ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (CI != CaseVals.end() && CI->first < EI->first) 759ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CI++; 760ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 761ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (CI != CaseVals.end() && CI->first == EI->first) 762ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor continue; 763ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 764ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Drop unneeded case ranges 765ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; RI != CaseRanges.end(); RI++) { 766ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 767ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI->first <= Hi) 768ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor break; 769ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 770ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 771ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (RI == CaseRanges.end() || EI->first < RI->first) 7720fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_cases) 7730fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << EI->second->getDeclName(); 774ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 775ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 776b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 777dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 778390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 779390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 780b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 781de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 782de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 783de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 7845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 78660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 78799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 7889ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Decl *CondVar, Stmt *Body) { 78960d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(Cond.release()); 79099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 7915656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 792d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 793d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 794586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); 79599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 79699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 7975656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 7989ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *ConditionExpr = CondResult.take(); 79999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 80099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 80199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8029ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 8031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 80443dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, 8059ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Body, WhileLoc)); 8065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 80860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 8099ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, 810989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 8119ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Cond, SourceLocation CondRParen) { 8129ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert(Cond && "ActOnDoStmt(): missing expression"); 813f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8149ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CheckBooleanCondition(Cond, DoLoc)) 8155a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 8165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 81760d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult = MaybeCreateCXXExprWithTemporaries(Cond); 8189ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 819586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 8209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 821586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 8229ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 823754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 8249ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); 8255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 82760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 828f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 8299ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, FullExprArg second, Decl *secondVar, 83099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 8319ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 8325921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 8335921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 834f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 835f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 836f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 8375921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 8385921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 8395921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 8405921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 8415921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 8425921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 8435921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 8445921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 8455921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 846ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 8475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 84899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 84960d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult SecondResult(second.release()); 85099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 851d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (secondVar) { 852d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(secondVar); 853586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); 85499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 85599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 85699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 85799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 85899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 85999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8603af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 8613af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 862754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 863754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 86443dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) ForStmt(Context, First, 8659ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SecondResult.take(), ConditionVar, 86643dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor Third, Body, ForLoc, LParenLoc, 86743dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor RParenLoc)); 8685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 87060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 871f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 872f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 8739ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, Expr *Second, 8749ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 87520552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 87620552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 87720552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 8787e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 879f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 880f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 881f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8827e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 883f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 884f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 885f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 886f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 887248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 888248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 889f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 890f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 8911fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 892c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor Expr *FirstE = cast<Expr>(First); 893c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstE->isTypeDependent() && 894c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor FirstE->isLvalue(Context) != Expr::LV_Valid) 895f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 896f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 897f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 8981fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 8991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 9001fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 901c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstType->isDependentType() && 902c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor !FirstType->isObjCObjectPointerType() && 903a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 904dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 905d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 9063ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 907c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (Second && !Second->isTypeDependent()) { 908a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(Second); 9093ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 910f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 911dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 912d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 913ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian else if (const ObjCObjectPointerType *OPT = 914ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian SecondType->getAsObjCInterfacePointerType()) { 915ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian llvm::SmallVector<IdentifierInfo *, 4> KeyIdents; 916ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian IdentifierInfo* selIdent = 917ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian &Context.Idents.get("countByEnumeratingWithState"); 918ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian KeyIdents.push_back(selIdent); 919ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian selIdent = &Context.Idents.get("objects"); 920ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian KeyIdents.push_back(selIdent); 921ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian selIdent = &Context.Idents.get("count"); 922ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian KeyIdents.push_back(selIdent); 923ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian Selector CSelector = Context.Selectors.getSelector(3, &KeyIdents[0]); 924ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian if (ObjCInterfaceDecl *IDecl = OPT->getInterfaceDecl()) { 925ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian if (!IDecl->isForwardDecl() && 926ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian !IDecl->lookupInstanceMethod(CSelector)) { 92780a785c2452c73b7c41d4a867edcf5a090c78c46Fariborz Jahanian // Must further look into private implementation methods. 928ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian if (!LookupPrivateInstanceMethod(CSelector, IDecl)) 929ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian Diag(ForLoc, diag::warn_collection_expr_type) 930ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian << SecondType << CSelector << Second->getSourceRange(); 931ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian } 932ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian } 933ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian } 9343ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 9358189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 9368189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 9373ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 9385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 93960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 9401b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 9415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 9425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 943ea29a3a0d6948c4a51a261d19ec1a585d2a9c779Chris Lattner LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 9445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 945b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall setFunctionHasBranchIntoScope(); 946b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 947caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 948caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 9498189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 9504cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9518189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 9525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 95460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 955ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 9569ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E) { 957bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 9585f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 9595f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 9602877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); 9615f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 9622877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth CheckSingleAssignmentConstraints(DestTy, E); 9632877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) 9645f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 9655f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 966b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 967b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall setFunctionHasIndirectGoto(); 968b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 9695f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 9705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 97260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 9731b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 9745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 9755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 9774cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 9785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9794cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9808189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 9815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 98360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 9841b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 9855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 9865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 9884cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 9895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9904cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9918189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 9925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 9945077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \brief Determine whether a return statement is a candidate for the named 9955077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// return value optimization (C++0x 12.8p34, bullet 1). 9965077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 9975077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param Ctx The context in which the return expression and type occur. 9985077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 9995077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param RetType The return type of the function or block. 10005077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10015077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param RetExpr The expression being returned from the function or block. 10025077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10035077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \returns The NRVO candidate variable, if the return statement may use the 10045077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// NRVO, or NULL if there is no such candidate. 10055077c3876beeaed32280af88244e8050078619a8Douglas Gregorstatic const VarDecl *getNRVOCandidate(ASTContext &Ctx, QualType RetType, 10065077c3876beeaed32280af88244e8050078619a8Douglas Gregor Expr *RetExpr) { 10073c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor QualType ExprType = RetExpr->getType(); 10083c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // - in a return statement in a function with ... 10093c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... a class return type ... 10103c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!RetType->isRecordType()) 10115077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10123c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... the same cv-unqualified type as the function return type ... 10133c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!Ctx.hasSameUnqualifiedType(RetType, ExprType)) 10145077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10153c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... the expression is the name of a non-volatile automatic object ... 10163c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // We ignore parentheses here. 10173c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // FIXME: Is this compliant? (Everyone else does it) 10183c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 10193c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!DR) 10205077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10213c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 10223c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!VD) 10235077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10245077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10255077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (VD->getKind() == Decl::Var && VD->hasLocalStorage() && 1026d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType()->isReferenceType() && !VD->hasAttr<BlocksAttr>() && 1027d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType().isVolatileQualified()) 10285077c3876beeaed32280af88244e8050078619a8Douglas Gregor return VD; 10295077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10305077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10313c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor} 10323c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor 103327c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 10344eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 103560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 10364eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 10374eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 10384eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 10399ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor BlockScopeInfo *CurBlock = getCurBlock(); 10407d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 1041c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 104216564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 104316564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 1044a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(RetValExp); 10457d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 10467d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 10477d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 10487d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 10497d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 10507d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 10517d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 10527d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 1053c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 10547d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 10554eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 10567d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 10574cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 105840b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 10596c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 10606c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 10616c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 10626c92fa75e62937f9738696840efcb258560f4568Mike Stump } 10636c92fa75e62937f9738696840efcb258560f4568Mike Stump 10644eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 10654eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 10664eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 10675077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 10684eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 10694eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 10704eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 10714eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 10724eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 10735077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 10745077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp) { 10754cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 10765077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 10775077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 10785077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10795077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 10805077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void block with an expression, continue checking 10815077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10825077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 10835077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 10845077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 10855077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10865077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 10875077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 10885077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate = getNRVOCandidate(Context, FnRetType, RetValExp); 108960d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult Res = PerformCopyInitialization( 10905077c3876beeaed32280af88244e8050078619a8Douglas Gregor InitializedEntity::InitializeResult(ReturnLoc, 10915077c3876beeaed32280af88244e8050078619a8Douglas Gregor FnRetType, 10925077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate != 0), 10935077c3876beeaed32280af88244e8050078619a8Douglas Gregor SourceLocation(), 10945077c3876beeaed32280af88244e8050078619a8Douglas Gregor Owned(RetValExp)); 10955077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 10965077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 10975077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 10985077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 10995077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11005077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11015077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11024cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11035077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 11045077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11055077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1106c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson } 1107c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson 11085077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 110998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 11104cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11115077c3876beeaed32280af88244e8050078619a8Douglas Gregor // If we need to check for the named return value optimization, save the 11125077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 11135077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 11145077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 11155077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 11165077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11175077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 11184eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 11195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 112060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 11219ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 11229ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor if (getCurBlock()) 11234eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 11244cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1125371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1126f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1127371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 112804a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall if (FD->hasAttr<NoReturnAttr>() || 112904a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) 11308662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 1131f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 1132f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1133c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 1134c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 1135c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 11361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11375077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 11385cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 11391be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor if (RetValExp && !RetValExp->isTypeDependent()) { 11401be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor // C99 6.8.6.4p1 (ext_ since GCC warns) 114165ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 114265ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 114365ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 11444cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1145e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 1146e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 1147e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 1148e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1149e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 1150e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 1151e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 1152e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 11531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11540ece491d8f62ce67f047491a6703fac0d3bd4ff4Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 11565077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11575077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 11585077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp && !FnRetType->isDependentType()) { 11593c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 11603c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 11613c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 11623c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 11633c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 116408631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 11653c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 116608631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 11675077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc); 11685077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 11695077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 11705077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 11715077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void function with an expression, continue checking 11725077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11735077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 11745077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 11755077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 11765077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11775077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 11785077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 11795077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate = getNRVOCandidate(Context, FnRetType, RetValExp); 118060d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult Res = PerformCopyInitialization( 11815077c3876beeaed32280af88244e8050078619a8Douglas Gregor InitializedEntity::InitializeResult(ReturnLoc, 11825077c3876beeaed32280af88244e8050078619a8Douglas Gregor FnRetType, 11835077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate != 0), 11845077c3876beeaed32280af88244e8050078619a8Douglas Gregor SourceLocation(), 11855077c3876beeaed32280af88244e8050078619a8Douglas Gregor Owned(RetValExp)); 11865077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 11875077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 11885077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 11895077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 11904cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11915077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 11925077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11935077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 119466724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 11955077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11965077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11975077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11985077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 1199898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 12005077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12015077c3876beeaed32280af88244e8050078619a8Douglas Gregor // If we need to check for the named return value optimization, save the 12025077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 12035077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 12045077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 12055077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 12065077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12075077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 12085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 12095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1210810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1211810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1212810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1213810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1214810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1215810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1216810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 1217810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 1218703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson // Type dependent expressions will be checked during instantiation. 1219703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson if (E->isTypeDependent()) 1220703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson return false; 1221703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson 1222810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 1223810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 1224810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1225810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 1226810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 1227810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 1228810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 1229810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 1230810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 1231810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1232810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 1233810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 1234810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1235810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 1236810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 1237810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 1238810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1239810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 1240810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 1241810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 1242810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1243810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 124460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 12453037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 12463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 12473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 12483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 1249ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson IdentifierInfo **Names, 12503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 12513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 12529ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *asmString, 12533037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 12543b11fd3b52e7b88233c602407c151d07cb093e75Mike Stump SourceLocation RParenLoc, 12553b11fd3b52e7b88233c602407c151d07cb093e75Mike Stump bool MSAsm) { 12563037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 12573037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 12583037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 12599ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr **Exprs = exprs.get(); 12609ae2f076ca5ab1feb3ba95629099ec2319833701John McCall StringLiteral *AsmString = cast<StringLiteral>(asmString); 12613037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 12623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 126303eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 12641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12651708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 12666bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 12673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 12683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 12693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12701708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 12711708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 12726bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 12733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 12743037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 12753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1276ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson llvm::StringRef OutputName; 1277ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 1278ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson OutputName = Names[i]->getName(); 1279ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 1280ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); 1281432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 12823037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1283432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1284432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 12853037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1286d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 128772056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1288810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 128972056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1290dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 129172056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 129204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 12931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 129444def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 129504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 12963037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1297806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1298806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 129904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 13001708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 13016bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 13023037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 13033037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 13043037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1305ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson llvm::StringRef InputName; 1306ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 1307ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson InputName = Names[i]->getName(); 1308ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 1309ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); 1310beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 13112819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 13123037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1313432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1314432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1315d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 13163037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 131772056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 13183037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1319d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 132044def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1321810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 132272056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1323d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1324432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 132572056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 132604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13273037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 132844def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1329d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 133072056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1331d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 13321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 133372056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1334d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1335d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 13361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1337a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(Exprs[i]); 13381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1339806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 134004728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13413037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 13426fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 13431708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 13441708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 13456bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 13463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 13473037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 13483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1349fdba9c069023f686e2608affde02c82131ee1cf8Anders Carlsson llvm::StringRef Clobber = Literal->getString(); 13503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1351fdba9c069023f686e2608affde02c82131ee1cf8Anders Carlsson if (!Context.Target.isValidGCCRegisterName(Clobber)) 13523037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 13537765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 13546fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 13553037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1356fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1357966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, 1358966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson NumOutputs, NumInputs, Names, Constraints, Exprs, 1359966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson AsmString, NumClobbers, Clobbers, RParenLoc); 1360fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1361fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1362fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1363fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1364fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 13652ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 13662ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1367fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner DeleteStmt(NS); 1368fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1369fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 13701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1371806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1372806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1373806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 13741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1375806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1376806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1377806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1378806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 13791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1380806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1381f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1382c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 13837adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 13847adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 13857adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1386806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 13871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1388aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Decide if the input and output are in the same domain (integer/ptr or 1389aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // floating point. 1390aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner enum AsmDomain { 1391aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AD_Int, AD_FP, AD_Other 1392aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } InputDomain, OutputDomain; 1393aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1394aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InTy->isIntegerType() || InTy->isPointerType()) 1395aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Int; 13960c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (InTy->isRealFloatingType()) 1397aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_FP; 1398aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1399aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Other; 14003351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 1401aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutTy->isIntegerType() || OutTy->isPointerType()) 1402aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Int; 14030c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (OutTy->isRealFloatingType()) 1404aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_FP; 1405aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1406aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Other; 1407aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1408aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // They are ok if they are the same size and in the same domain. This 1409aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // allows tying things like: 1410aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int* 1411aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int if they are the same size. 1412aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // double to long double if they are the same size. 1413aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // 1414aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 1415aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 1416aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutSize == InSize && InputDomain == OutputDomain && 1417aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain != AD_Other) 1418aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 1419aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1420aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 1421aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // then we can promote it and the asm string won't notice. Check this 1422aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // case now. 1423aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner bool SmallerValueMentioned = false; 1424aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 1425aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 1426aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!Piece.isOperand()) continue; 1427aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1428aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If this is a reference to the input and if the input was the smaller 1429aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // one, then we have to reject this asm. 1430aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 1431aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InSize < OutSize) { 1432aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner SmallerValueMentioned = true; 1433aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner break; 14343351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1435f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 14361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1437aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If this is a reference to the input and if the input was the smaller 1438aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // one, then we have to reject this asm. 1439aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Piece.getOperandNo() == TiedTo) { 1440aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InSize > OutSize) { 1441aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner SmallerValueMentioned = true; 1442aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner break; 1443aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } 1444aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } 1445806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 14461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1447aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 1448aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // output was a register, just extend the shorter one to the size of the 1449aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // larger one. 1450aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!SmallerValueMentioned && InputDomain != AD_Other && 1451aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1452aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 1453aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1454c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1455806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 14567adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1457806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1458806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner DeleteStmt(NS); 1459806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1460806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 14611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1462fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1463fe795956194141c91ae555985c9b930595bff43fChris Lattner} 14643b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 146560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1466431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1467d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall SourceLocation RParen, Decl *Parm, 14689ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *Body) { 1469d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall VarDecl *Var = cast_or_null<VarDecl>(Parm); 1470160b5630aa781ac348303e1ae088d27016637778Douglas Gregor if (Var && Var->isInvalidDecl()) 1471160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return StmtError(); 1472160b5630aa781ac348303e1ae088d27016637778Douglas Gregor 14739ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); 14743b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 14753b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 147660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 14779ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { 14789ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); 1479161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1480bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 148160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 14829ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, 14839ae2f076ca5ab1feb3ba95629099ec2319833701John McCall MultiStmtArg CatchStmts, Stmt *Finally) { 1484b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall setFunctionHasBranchProtectedScope(); 14858f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor unsigned NumCatchStmts = CatchStmts.size(); 14869ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, 14879ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CatchStmts.release(), 14888f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor NumCatchStmts, 14899ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Finally)); 1490bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1491bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 149260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, 14939ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Throw) { 1494d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (Throw) { 1495d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor QualType ThrowType = Throw->getType(); 1496d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor // Make sure the expression type is an ObjC pointer or "void *". 1497d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!ThrowType->isDependentType() && 1498d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor !ThrowType->isObjCObjectPointerType()) { 1499d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor const PointerType *PT = ThrowType->getAs<PointerType>(); 1500d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!PT || !PT->getPointeeType()->isVoidType()) 1501d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 1502d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor << Throw->getType() << Throw->getSourceRange()); 1503d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1504d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1505d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 15069ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); 1507d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor} 1508d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 150960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 15109ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, 1511d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Scope *CurScope) { 15129ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Throw) { 1513e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1514e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1515e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1516e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1517e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1518e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 15194ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 1520d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1521d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 15229ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return BuildObjCAtThrowStmt(AtLoc, Throw); 152339f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1524bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 152560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 15269ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, 15279ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SyncBody) { 1528b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall setFunctionHasBranchProtectedScope(); 152946c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1530a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 15318fdc13a78a43f09ac396e682c35d57ca0b48216dDouglas Gregor if (!SyncExpr->getType()->isDependentType() && 15328fdc13a78a43f09ac396e682c35d57ca0b48216dDouglas Gregor !SyncExpr->getType()->isObjCObjectPointerType()) { 15336217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1534a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1535a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1536a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1537a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 15381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15399ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); 1540fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 15414b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 15424b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 15434b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 154460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1545d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, 15469ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *HandlerBlock) { 15474b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 15488189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1549d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall cast_or_null<VarDecl>(ExDecl), 15509ae2f076ca5ab1feb3ba95629099ec2319833701John McCall HandlerBlock)); 15514b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 15528351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 15533c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 15543c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 1555c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1556c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1557c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1558c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1559c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1560c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1561c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 15620953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 15630953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 1564c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 15650953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 1566c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 15670953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 1568c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1569c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1570c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1571c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1573c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 15740953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 1575c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1577c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType getQualType() const { return t; } 1578c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1579c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1580c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1581c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1582c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1583c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 15843c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 15853c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 15868351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 15878351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 158860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 15899ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, 15908351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 15918351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 15928351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 15938351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 15949ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt **Handlers = RawHandlers.get(); 15958351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1596c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 15971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 15998351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1600c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1601c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1602c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1603c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 16041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1605c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1606c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1608c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1609c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1610c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1611c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1612c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1613c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1614c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1615c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 16161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1617c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1618c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1619c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 16201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1621c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1622c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1623c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1624c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1625c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1626c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1627c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1628c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1630c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1631c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16328351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 16331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1634b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall setFunctionHasBranchProtectedScope(); 1635b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 16368351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 16378351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 16388351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 16398351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 16408351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 16418351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 16429ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, 1643a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig Handlers, NumHandlers)); 16448351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1645