SemaStmt.cpp revision 47bb27f16882e4f5ababdd0cf6642bb904a9aaf8
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 142d88708cbe4e4ec5e04e4acb6bd7f5be68557379John McCall#include "clang/Sema/SemaInternal.h" 155f1e0942a32657b625702aa52f82430d0120f424John McCall#include "clang/Sema/Scope.h" 16781472fe99a120098c631b0cbe33c89f8cef5e70John McCall#include "clang/Sema/ScopeInfo.h" 17e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Initialization.h" 1851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson#include "clang/AST/APValue.h" 19f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner#include "clang/AST/ASTContext.h" 20c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/AST/DeclObjC.h" 2184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/AST/ExprCXX.h" 22419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner#include "clang/AST/ExprObjC.h" 2316f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtObjC.h" 2416f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtCXX.h" 25209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall#include "clang/AST/TypeLoc.h" 2684fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/Lex/Preprocessor.h" 276fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 28c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/STLExtras.h" 29c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/SmallVector.h" 305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 31781472fe99a120098c631b0cbe33c89f8cef5e70John McCallusing namespace sema; 325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 349ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E = expr.get(); 351b273c403734d343d720acb28f04011807c8aa56Steve Naroff assert(E && "ActOnExprStmt(): missing expression"); 36834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 37834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 38834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 39a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 40834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 41a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { 468189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) NullStmt(SemiLoc)); 475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, 50a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation StartLoc, 51a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl SourceLocation EndLoc) { 5220401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 5520401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 60a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanianvoid Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { 61a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 62a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 63a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // If we have an invalid decl, just return. 64a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian if (DG.isNull() || !DG.isSingleDecl()) return; 65a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // suppress any potential 'unused variable' warning. 66a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DG.getSingleDecl()->setUsed(); 67a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian} 68a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 69636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 70754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 71636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 72636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 73636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 74636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 75636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 76df317bf71653eeb235da8337b1e8e790f9653aa4Mike Stump if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) 77636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 79419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 80419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 81419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 82419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 83419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner E = E->IgnoreParens(); 8409105f52b1f28cbb1374c27c3c70f5517e2c465dFariborz Jahanian if (isa<ObjCImplicitSetterGetterRefExpr>(E)) 85419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner DiagID = diag::warn_unused_property_expr; 86bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner 874dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor if (const CXXExprWithTemporaries *Temps = dyn_cast<CXXExprWithTemporaries>(E)) 884dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor E = Temps->getSubExpr(); 894dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor 90bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 910faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall if (E->getType()->isVoidType()) 920faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall return; 930faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall 94bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 95bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 96d20254f2875d0004c57ee766f258dbcee29f4841Nuno Lopes if (const Decl *FD = CE->getCalleeDecl()) { 97bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 98bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 99bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 100bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 101bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 102bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 103bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 104bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 105bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 106bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 107bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 108bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 109bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 110bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 111f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { 112f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian const ObjCMethodDecl *MD = ME->getMethodDecl(); 113f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 114f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; 115f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian return; 116f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 117d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor } else if (const CXXFunctionalCastExpr *FC 118d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor = dyn_cast<CXXFunctionalCastExpr>(E)) { 119d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor if (isa<CXXConstructExpr>(FC->getSubExpr()) || 120d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) 121d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor return; 122f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 123209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // Diagnose "(void*) blah" as a typo for "(void) blah". 124209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { 125209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); 126209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall QualType T = TI->getType(); 127209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 128209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // We really do want to use the non-canonical type here. 129209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall if (T == Context.VoidPtrTy) { 130209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); 131209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 132209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall Diag(Loc, diag::warn_unused_voidptr) 133209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall << FixItHint::CreateRemoval(TL.getStarLoc()); 134209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall return; 135209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 136209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 137209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 13835e12c90c1b107a75c5615aa76fdbd403661aaa6Douglas Gregor DiagRuntimeBehavior(Loc, PDiag(DiagID) << R1 << R2); 139636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 140636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 14160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1421b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 143a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 144a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 145a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 146c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 147c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 148c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 149c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 150c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 151c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 152c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 153c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 154c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 155c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 156c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 157c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 1581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 159c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 1604afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 161c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 162c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 163c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 16498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 16598414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 166636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 167636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 16898414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 1691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 170636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 17198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 172a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 1738189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 1745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 17660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1779ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, 1789ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation DotDotDotLoc, Expr *RHSVal, 17924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 1809ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert((LHSVal != 0) && "missing expression in case statement"); 181117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 1825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 1831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // However, GCC allows any evaluatable integer expression. 1841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 185dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 18624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1886c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 189117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 190dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 191dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 192f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 193117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 194117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 195781472fe99a120098c631b0cbe33c89f8cef5e70John McCall if (getCurFunction()->SwitchStack.empty()) { 1968a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 19724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 1988a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 1995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 200dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 201dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 202781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(CS); 203117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 2045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 20624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 2079ae2f076ca5ab1feb3ba95629099ec2319833701John McCallvoid Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { 20824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 20924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 21024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 21124e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 21260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2131eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 2149ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SubStmt, Scope *CurScope) { 215781472fe99a120098c631b0cbe33c89f8cef5e70John McCall if (getCurFunction()->SwitchStack.empty()) { 2160fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 217117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 2180fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 219117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 220dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 221781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(DS); 222117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 2235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 22560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2261b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, 2279ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation ColonLoc, Stmt *SubStmt) { 2285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 229781472fe99a120098c631b0cbe33c89f8cef5e70John McCall LabelStmt *&LabelDecl = getCurFunction()->LabelMap[II]; 230de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If not forward referenced or defined already, just create a new LabelStmt. 232caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 233caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); 234de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(LabelDecl->getID() == II && "Label mismatch!"); 236de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was either forward reference or multiply defined. If 2385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // multiply defined, reject it now. 2395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (LabelDecl->getSubStmt()) { 24008631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); 2415f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); 242de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 2435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 244de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 2455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, this label was forward declared, and we just found its real 2465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // definition. Fill in the forward definition and return it. 2475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer LabelDecl->setIdentLoc(IdentLoc); 2480fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner LabelDecl->setSubStmt(SubStmt); 249de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(LabelDecl); 2505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 25260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 253d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, 2549ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *thenStmt, SourceLocation ElseLoc, 2559ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *elseStmt) { 25660d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(CondVal.release()); 2571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2588cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 259d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 260d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 261586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); 26299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 26399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2648cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 26599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 26699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 26799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 2688cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor 269754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 2705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2712d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 2722d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 2732d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 2742d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 2759ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!elseStmt) { 2762d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 2772d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 2782d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 2792d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 280754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 2811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28243dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, 28399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor thenStmt, ElseLoc, elseStmt)); 2845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 286f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 287f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 288f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 289f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 290f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 2911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 292f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 293f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 294f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 295f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 296f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.extend(NewWidth); 297f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 298f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor 299f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // If the input was signed and negative and the output is 300f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // unsigned, don't bother to warn: this is implementation-defined 301f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // behavior. 302f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 303f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 304f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 305f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 306f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.trunc(NewWidth); 307b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 308f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvVal.extend(Val.getBitWidth()); 309b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 310f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 311d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 3121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 313f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 314f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 315f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.trunc(NewWidth); 316b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 317f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 318f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 319f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 3202853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // We don't diagnose this overflow, because it is implementation-defined 3212853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // behavior. 3222853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 323f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 324f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 325f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 326f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 327f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 3280471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 3290471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 3300471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3310471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 3320471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 3330471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3340e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 3350e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3360e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 3370e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 3380471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 3390471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 3400471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 3410471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 3420471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 3430471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 3440471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 345764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 346764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 347764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 348764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 349764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 350764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 351764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 352764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 353764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 354764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 355764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 356764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 357764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 358764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 359ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// CmpEnumVals - Comparison predicate for sorting enumeration values. 360ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 361ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 362ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 363ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 364ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first < rhs.first; 365ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 366ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 367ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// EqEnumVals - Comparison preficate for uniqing enumeration values. 368ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 369ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 370ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 371ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 372ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first == rhs.first; 373ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 374ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 3755f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 3765f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 3775f04881eb025f61396d0555d8173730fe2759e0aChris Lattnerstatic QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { 3786907fbe758d23e1aec4c0a67e7b633d1d855feb4John McCall if (const CastExpr *ImplicitCast = dyn_cast<ImplicitCastExpr>(expr)) { 3795f04881eb025f61396d0555d8173730fe2759e0aChris Lattner const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); 3805f04881eb025f61396d0555d8173730fe2759e0aChris Lattner QualType TypeBeforePromotion = ExprBeforePromotion->getType(); 3812ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (TypeBeforePromotion->isIntegralOrEnumerationType()) { 3825f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return TypeBeforePromotion; 3835f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3845f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 3855f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 3865f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 3875f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 38860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 3899ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, 390d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall Decl *CondVar) { 39160d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult; 3929ae2f076ca5ab1feb3ba95629099ec2319833701John McCall 393586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor VarDecl *ConditionVar = 0; 394d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 395d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 3969ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); 3979ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 398586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 399eecf38f821fe8e113722096b77da7d68b26d28d1Douglas Gregor 4009ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.release(); 401586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 402586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 4039ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Cond) 404586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 405586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 4069ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult 4079ae2f076ca5ab1feb3ba95629099ec2319833701John McCall = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, 408c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_typecheck_statement_requires_integer), 409c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 4109ae2f076ca5ab1feb3ba95629099ec2319833701John McCall << Cond->getSourceRange(), 411c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_explicit_conversion), 412c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::note_switch_conversion), 413c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_multiple_conversions), 4146bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(diag::note_switch_conversion), 4156bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(0)); 4169ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) return StmtError(); 4179ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 418c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor 419d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (!CondVar) { 4209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = MaybeCreateCXXExprWithTemporaries(Cond); 4219ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 422586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 4239ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 424586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 425b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 426781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchIntoScope(); 427586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 4289ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); 429781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.push_back(SS); 430586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return Owned(SS); 4317e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner} 4327e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner 43360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 4349ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, 4359ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *BodyStmt) { 4369ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = cast<SwitchStmt>(Switch); 437781472fe99a120098c631b0cbe33c89f8cef5e70John McCall assert(SS == getCurFunction()->SwitchStack.back() && 438781472fe99a120098c631b0cbe33c89f8cef5e70John McCall "switch stack missing push/pop!"); 439de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4409dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 441781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.pop_back(); 442c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 443ff331c15729f7d4439d253c97f4d60f2a7ffd0c6Douglas Gregor if (SS->getCond() == 0) 444be724bab2ba7ad47aebced25e7c8ec551eb72d28Douglas Gregor return StmtError(); 445be724bab2ba7ad47aebced25e7c8ec551eb72d28Douglas Gregor 446f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 4470fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr *CondExprBeforePromotion = CondExpr; 44884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor QualType CondTypeBeforePromotion = 44984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor GetTypeBeforeIntegralPromotion(CondExpr); 450de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 4510de55e7e6b8a53c5d1f2e9a811fd0a4ea13ed5b0Douglas Gregor // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 4520de55e7e6b8a53c5d1f2e9a811fd0a4ea13ed5b0Douglas Gregor UsualUnaryConversions(CondExpr); 453a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 45484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor SS->setCond(CondExpr); 45584fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 4565f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 4575f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 4585f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 4595f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 4605f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 4615f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 4625f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 46312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 464acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // We have already converted the expression to an integral or enumeration 465acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // type, when we started the switch statement. If we don't have an 466acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // appropriate type now, just return an error. 467acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor if (!CondType->isIntegralOrEnumerationType()) 46812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 46912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 4702b334bb3126a67895813e49e6228dad4aec0b4d6Chris Lattner if (CondExpr->isKnownToHaveBooleanValue()) { 47112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 47212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 47312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 47412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 47512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 47612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 477c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 478de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 479f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 480f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 4811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 482dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 4831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 484dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = HasDependentValue? 0 4855f04881eb025f61396d0555d8173730fe2759e0aChris Lattner : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); 4865f04881eb025f61396d0555d8173730fe2759e0aChris Lattner bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); 4871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 488f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 489f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 490f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 4910471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 4920471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 4931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 494f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 495ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; 496ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy CaseRanges; 4971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 498f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 4991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 500b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 5011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 502dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 503c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 5041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 505c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 506f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 507f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 5085f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 509de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 510f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 511390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 512390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 513390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 514b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 515c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 516f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 5171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 518f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 519f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 5201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 521f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 522f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 5231e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 524dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 525dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 526dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 527dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 528dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 53051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 5311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 532f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 533f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 534f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CS->getLHS()->getLocStart(), 535f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 5366c36be5b383875b490684bcf439d6d427298c1afChris Lattner 5371e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 5381e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 5392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall ImpCastExprToType(Lo, CondType, CK_IntegralCast); 5401e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 5411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 542b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 543dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 5441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 545dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 546dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 547dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 548dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 549f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 5501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 551b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 552f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 553f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 554b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 555dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 5560fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // If we don't have a default statement, check whether the 5570fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // condition is constant. 5580fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt ConstantCondValue; 5590fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool HasConstantCond = false; 5600fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool ShouldCheckConstantCond = false; 5610fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!HasDependentValue && !TheDefaultStmt) { 5620fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr::EvalResult Result; 5630fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall HasConstantCond = CondExprBeforePromotion->Evaluate(Result, Context); 5640fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (HasConstantCond) { 5650fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(Result.Val.isInt() && "switch condition evaluated to non-int"); 5660fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue = Result.Val.getInt(); 5670fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = true; 5680fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 5690fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(ConstantCondValue.getBitWidth() == CondWidth && 5700fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue.isSigned() == CondIsSigned); 5710fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 5720fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 5730fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 574dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 575dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 576dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 577dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 5780fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { 5790fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 5800fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CaseVals[i].first == ConstantCondValue) 5810fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 5820fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 5830fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { 584dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 5851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 5860fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall diag::err_duplicate_case) << CaseVals[i].first.toString(10); 5870fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CaseVals[i-1].second->getLHS()->getLocStart(), 588dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 589390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 590390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 591dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 592dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 5936efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 594b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 5951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 596dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 597dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 598dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 599dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 600dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 601dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 6021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 603dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 604dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 605dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 6060fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt &LoVal = CaseRanges[i].first; 607dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 608dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 609dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 6101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 611dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 612dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 613dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocStart(), 614dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 6151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 616dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 617dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 6182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall ImpCastExprToType(Hi, CondType, CK_IntegralCast); 619dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 6201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 621dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 6220fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (LoVal > HiVal) { 623dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 624dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 625dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->getRHS()->getLocEnd()); 626dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 627dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 628dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 629dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6300fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 6310fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 6320fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall LoVal <= ConstantCondValue && 6330fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue <= HiVal) 6340fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 6350fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 636dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 6370471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 6381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 640dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 641dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 642dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 643dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 644dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 645dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 6461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 647dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 648dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 649dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 650dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 6511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 652dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 653dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 654dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 655dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 656dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 657dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 658dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 659dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 660dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 662dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 663dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 664dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 665dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 666dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 667dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 669dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 670dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 671dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 672dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 676dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 677dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 679dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 6801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 682390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 683390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 684dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 685dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6860471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 687b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 688ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 6890fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Complain if we have a constant condition and we didn't find a match. 6900fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && ShouldCheckConstantCond) { 6910fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: it would be nice if we printed enums as enums, chars as 6920fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // chars, etc. 6930fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) 6940fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ConstantCondValue.toString(10) 6950fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << CondExpr->getSourceRange(); 6960fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 6970fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 6980fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Check to see if switch is over an Enum and handles all of its 699559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // values. We only issue a warning if there is not 'default:', but 700559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // we still do the analysis to preserve this information in the AST 701559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // (which can be used by flow-based analyes). 7020fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // 70330ab37122300a5f6664b8ae2d0b43b4396eb6bcbDouglas Gregor const EnumType* ET = CondTypeBeforePromotion->getAs<EnumType>(); 704559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 705ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // If switch has default case, then ignore it. 706559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!CaseListIsErroneous && !HasConstantCond && ET) { 707ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const EnumDecl *ED = ET->getDecl(); 708ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef llvm::SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> EnumValsTy; 709ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy EnumVals; 710ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 7110fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Gather all enum values, set their type and sort them, 7120fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // allowing easier comparison with CaseVals. 7130fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); 7140fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EDI != ED->enumerator_end(); EDI++) { 715ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Val = (*EDI)->getInitVal(); 716ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if(Val.getBitWidth() < CondWidth) 717ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor Val.extend(CondWidth); 7186623584c0ec508110d75572eef092bf98fedf3f4Douglas Gregor else if (Val.getBitWidth() > CondWidth) 7196623584c0ec508110d75572eef092bf98fedf3f4Douglas Gregor Val.trunc(CondWidth); 720ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor Val.setIsSigned(CondIsSigned); 721ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumVals.push_back(std::make_pair(Val, (*EDI))); 722ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 723ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); 7240fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EnumValsTy::iterator EIend = 7250fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); 726559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 727559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // See which case values aren't in enum. 728559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // TODO: we might want to check whether case values are out of the 729559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // enum even if we don't want to check whether all cases are handled. 730559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!TheDefaultStmt) { 73147bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EnumValsTy::const_iterator EI = EnumVals.begin(); 73247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek for (CaseValsTy::const_iterator CI = CaseVals.begin(); 7330fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CI != CaseVals.end(); CI++) { 73447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek while (EI != EIend && EI->first < CI->first) 73547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI++; 73647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (EI == EIend || EI->first > CI->first) 7370fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 7380fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 73947bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 74047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek // See which of case ranges aren't in enum 74147bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI = EnumVals.begin(); 74247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); 7430fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall RI != CaseRanges.end() && EI != EIend; RI++) { 74447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek while (EI != EIend && EI->first < RI->first) 74547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI++; 746ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 74747bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (EI == EIend || EI->first != RI->first) { 74847bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 74947bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek << ED->getDeclName(); 75047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 751e0ba9d1beeba01a96808c2fc61f9ca89acec313bTed Kremenek 75247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 75347bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek while (EI != EIend && EI->first < Hi) 75447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI++; 75547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (EI == EIend || EI->first != Hi) 75647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) 75747bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek << ED->getDeclName(); 75847bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 759ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 760559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Check which enum vals aren't in switch 761ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseValsTy::const_iterator CI = CaseVals.begin(); 762ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy::const_iterator RI = CaseRanges.begin(); 763559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek bool hasCasesNotInSwitch = false; 764559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 765559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek for (EnumValsTy::const_iterator EI = EnumVals.begin(); EI != EIend; EI++){ 766ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor //Drop unneeded case values 767ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt CIVal; 768ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (CI != CaseVals.end() && CI->first < EI->first) 769ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CI++; 770ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 771ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (CI != CaseVals.end() && CI->first == EI->first) 772ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor continue; 773ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 774559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Drop unneeded case ranges 775ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; RI != CaseRanges.end(); RI++) { 776ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 777ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI->first <= Hi) 778ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor break; 779ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 780ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 781559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (RI == CaseRanges.end() || EI->first < RI->first) { 78247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek hasCasesNotInSwitch = true; 78347bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (!TheDefaultStmt) 78447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek Diag(CondExpr->getExprLoc(), diag::warn_missing_cases) 78547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek << EI->second->getDeclName(); 78647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 787ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 788559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 789559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!hasCasesNotInSwitch) 79047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek SS->setAllEnumCasesCovered(); 791ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 792b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 793dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 794390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 795390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 796b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 797de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 798de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 799de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 8005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 80260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 80399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas GregorSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 8049ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Decl *CondVar, Stmt *Body) { 80560d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(Cond.release()); 80699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8075656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 808d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 809d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 810586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); 81199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 81299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 8135656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 8149ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *ConditionExpr = CondResult.take(); 81599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 81699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 81799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8189ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 8191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 82043dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, 8219ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Body, WhileLoc)); 8225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 82460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 8259ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, 826989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 8279ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Cond, SourceLocation CondRParen) { 8289ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert(Cond && "ActOnDoStmt(): missing expression"); 829f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8309ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CheckBooleanCondition(Cond, DoLoc)) 8315a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 8325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 83360d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult = MaybeCreateCXXExprWithTemporaries(Cond); 8349ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 835586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 8369ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 837586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor 8389ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 839754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 8409ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); 8415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 84360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 844f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 8459ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, FullExprArg second, Decl *secondVar, 84699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 8479ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 8485921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 8495921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 850f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 851f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 852f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 8535921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 8545921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 8555921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 8565921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) 8575921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 8585921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 8595921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 8605921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 8615921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 862ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 8635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 86499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 86560d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult SecondResult(second.release()); 86699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 867d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (secondVar) { 868d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(secondVar); 869586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); 87099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 87199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 87299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 87399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 87499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 87599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 8763af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 8773af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 878754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 879754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 88043dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) ForStmt(Context, First, 8819ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SecondResult.take(), ConditionVar, 88243dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor Third, Body, ForLoc, LParenLoc, 88343dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor RParenLoc)); 8845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 88660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 887f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 888f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 8899ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, Expr *Second, 8909ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 89120552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 89220552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 89320552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 8947e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 895f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 896f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 897f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 8987e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner Decl *D = DS->getSingleDecl(); 899f34afeed9a0112bf31fee185b6c80556111d3834Ted Kremenek FirstType = cast<ValueDecl>(D)->getType(); 900f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 901f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 902f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 903248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff VarDecl *VD = cast<VarDecl>(D); 904248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve Naroff if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) 905f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(VD->getLocation(), 906f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 9071fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 908c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor Expr *FirstE = cast<Expr>(First); 909c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstE->isTypeDependent() && 910c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor FirstE->isLvalue(Context) != Expr::LV_Valid) 911f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 912f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 913f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 9141fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 9151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 9161fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 917c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstType->isDependentType() && 918c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor !FirstType->isObjCObjectPointerType() && 919a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 920dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 921d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 9223ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 923c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (Second && !Second->isTypeDependent()) { 924a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(Second); 9253ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian QualType SecondType = Second->getType(); 926f49545602089be5b1f744e04326b8a566f6d8773Steve Naroff if (!SecondType->isObjCObjectPointerType()) 927dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_collection_expr_type) 928d162584991885ab004a02573a73ce06422b921fcChris Lattner << SecondType << Second->getSourceRange(); 929ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian else if (const ObjCObjectPointerType *OPT = 930ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian SecondType->getAsObjCInterfacePointerType()) { 931ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian llvm::SmallVector<IdentifierInfo *, 4> KeyIdents; 932ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian IdentifierInfo* selIdent = 933ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian &Context.Idents.get("countByEnumeratingWithState"); 934ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian KeyIdents.push_back(selIdent); 935ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian selIdent = &Context.Idents.get("objects"); 936ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian KeyIdents.push_back(selIdent); 937ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian selIdent = &Context.Idents.get("count"); 938ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian KeyIdents.push_back(selIdent); 939ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian Selector CSelector = Context.Selectors.getSelector(3, &KeyIdents[0]); 940ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian if (ObjCInterfaceDecl *IDecl = OPT->getInterfaceDecl()) { 941ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian if (!IDecl->isForwardDecl() && 942ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian !IDecl->lookupInstanceMethod(CSelector)) { 94380a785c2452c73b7c41d4a867edcf5a090c78c46Fariborz Jahanian // Must further look into private implementation methods. 944ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian if (!LookupPrivateInstanceMethod(CSelector, IDecl)) 945ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian Diag(ForLoc, diag::warn_collection_expr_type) 946ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian << SecondType << CSelector << Second->getSourceRange(); 947ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian } 948ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian } 949ea16110ce3a4fbb205735f0a55050bc11292e82cFariborz Jahanian } 9503ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 9518189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 9528189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 9533ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 9545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 95560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 9561b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, 9575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IdentifierInfo *LabelII) { 9585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Look up the record for this label identifier. 959781472fe99a120098c631b0cbe33c89f8cef5e70John McCall LabelStmt *&LabelDecl = getCurFunction()->LabelMap[LabelII]; 9605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 961781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchIntoScope(); 962b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 963caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff // If we haven't seen this label yet, create a forward reference. 964caaacecb2b64e6d2e402533baffda4cb540f4145Steve Naroff if (LabelDecl == 0) 9658189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); 9664cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9678189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); 9685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 97060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 971ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 9729ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E) { 973bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 9745f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 9755f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 9762877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); 9775f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 9782877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth CheckSingleAssignmentConstraints(DestTy, E); 9792877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) 9805f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 9815f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 982b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 983781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasIndirectGoto(); 984b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 9855f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 9865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 98860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 9891b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 9905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 9915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 9925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 9934cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 9945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9954cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 9968189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 9975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 99960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 10001b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 10015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 10025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 10035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 10044cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 10055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10064cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 10078189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 10085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 10105077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \brief Determine whether a return statement is a candidate for the named 10115077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// return value optimization (C++0x 12.8p34, bullet 1). 10125077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10135077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param Ctx The context in which the return expression and type occur. 10145077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10155077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param RetType The return type of the function or block. 10165077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10175077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \param RetExpr The expression being returned from the function or block. 10185077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 10195077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \returns The NRVO candidate variable, if the return statement may use the 10205077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// NRVO, or NULL if there is no such candidate. 10215077c3876beeaed32280af88244e8050078619a8Douglas Gregorstatic const VarDecl *getNRVOCandidate(ASTContext &Ctx, QualType RetType, 10225077c3876beeaed32280af88244e8050078619a8Douglas Gregor Expr *RetExpr) { 10233c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor QualType ExprType = RetExpr->getType(); 10243c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // - in a return statement in a function with ... 10253c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... a class return type ... 10263c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!RetType->isRecordType()) 10275077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10283c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... the same cv-unqualified type as the function return type ... 10293c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!Ctx.hasSameUnqualifiedType(RetType, ExprType)) 10305077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10313c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... the expression is the name of a non-volatile automatic object ... 10323c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // We ignore parentheses here. 10333c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // FIXME: Is this compliant? (Everyone else does it) 10343c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); 10353c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!DR) 10365077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10373c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 10383c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!VD) 10395077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10405077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10415077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (VD->getKind() == Decl::Var && VD->hasLocalStorage() && 1042d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType()->isReferenceType() && !VD->hasAttr<BlocksAttr>() && 1043d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType().isVolatileQualified()) 10445077c3876beeaed32280af88244e8050078619a8Douglas Gregor return VD; 10455077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10465077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 10473c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor} 10483c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor 104927c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 10504eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 105160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 10524eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 10534eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 10544eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 10559ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor BlockScopeInfo *CurBlock = getCurBlock(); 10567d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 1057c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 105816564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 105916564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 1060a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(RetValExp); 10617d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = RetValExp->getType(); 10627d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 10637d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // We have to remove a 'const' added to copied-in variable which was 10647d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // part of the implementation spec. and not the actual qualifier for 10657d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian // the variable. 10667d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CDRE->isConstQualAdded()) 10677d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType.removeConst(); 10687d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian } 1069c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 10707d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 10714eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 10727d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 10734cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 107440b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { 10756c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 10766c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 10776c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 10786c92fa75e62937f9738696840efcb258560f4568Mike Stump } 10796c92fa75e62937f9738696840efcb258560f4568Mike Stump 10804eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 10814eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 10824eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 10835077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 10844eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 10854eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (RetValExp) { 10864eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 10874eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 10884eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 10895077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 10905077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp) { 10914cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 10925077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 10935077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 10945077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10955077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 10965077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void block with an expression, continue checking 10975077c3876beeaed32280af88244e8050078619a8Douglas Gregor 10985077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 10995077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 11005077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 11015077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11025077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 11035077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 11045077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate = getNRVOCandidate(Context, FnRetType, RetValExp); 110560d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult Res = PerformCopyInitialization( 11065077c3876beeaed32280af88244e8050078619a8Douglas Gregor InitializedEntity::InitializeResult(ReturnLoc, 11075077c3876beeaed32280af88244e8050078619a8Douglas Gregor FnRetType, 11085077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate != 0), 11095077c3876beeaed32280af88244e8050078619a8Douglas Gregor SourceLocation(), 11105077c3876beeaed32280af88244e8050078619a8Douglas Gregor Owned(RetValExp)); 11115077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 11125077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 11135077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 11145077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 11155077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11165077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11175077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11184cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11195077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 11205077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 11215077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1122c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson } 1123c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson 11245077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 112598eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 11264cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 11275077c3876beeaed32280af88244e8050078619a8Douglas Gregor // If we need to check for the named return value optimization, save the 11285077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 11295077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 11305077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 11315077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 11325077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11335077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 11344eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 11355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 113660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 11379ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 11389ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor if (getCurBlock()) 11394eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 11404cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1141371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1142f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1143371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 114404a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall if (FD->hasAttr<NoReturnAttr>() || 114504a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) 11468662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 1147f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 1148f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump } else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1149c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff FnRetType = MD->getResultType(); 1150c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff else // If we don't have a function/method context, bail. 1151c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 11521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11535077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 11545cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 11551be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor if (RetValExp && !RetValExp->isTypeDependent()) { 11561be8aee8745e8b814ad2f151aa214b0ef07833dbDouglas Gregor // C99 6.8.6.4p1 (ext_ since GCC warns) 115765ce04bef06696379682410f399f37b43996d824Chris Lattner unsigned D = diag::ext_return_has_expr; 115865ce04bef06696379682410f399f37b43996d824Chris Lattner if (RetValExp->getType()->isVoidType()) 115965ce04bef06696379682410f399f37b43996d824Chris Lattner D = diag::ext_return_has_void_expr; 11604cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1161e878eb035b343d7d819c092102364ec9849716aeChris Lattner // return (some void expression); is legal in C++. 1162e878eb035b343d7d819c092102364ec9849716aeChris Lattner if (D != diag::ext_return_has_void_expr || 1163e878eb035b343d7d819c092102364ec9849716aeChris Lattner !getLangOptions().CPlusPlus) { 1164e878eb035b343d7d819c092102364ec9849716aeChris Lattner NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1165e878eb035b343d7d819c092102364ec9849716aeChris Lattner Diag(ReturnLoc, D) 1166e878eb035b343d7d819c092102364ec9849716aeChris Lattner << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) 1167e878eb035b343d7d819c092102364ec9849716aeChris Lattner << RetValExp->getSourceRange(); 1168e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 11691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11700ece491d8f62ce67f047491a6703fac0d3bd4ff4Anders Carlsson RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 11715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 11725077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11735077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 11745077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp && !FnRetType->isDependentType()) { 11753c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 11763c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 11773c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 11783c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 11793c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 118008631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 11813c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 118208631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 11835077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc); 11845077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 11855077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 11865077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 11875077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void function with an expression, continue checking 11885077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11895077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 11905077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 11915077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 11925077c3876beeaed32280af88244e8050078619a8Douglas Gregor 11935077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 11945077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 11955077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate = getNRVOCandidate(Context, FnRetType, RetValExp); 119660d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult Res = PerformCopyInitialization( 11975077c3876beeaed32280af88244e8050078619a8Douglas Gregor InitializedEntity::InitializeResult(ReturnLoc, 11985077c3876beeaed32280af88244e8050078619a8Douglas Gregor FnRetType, 11995077c3876beeaed32280af88244e8050078619a8Douglas Gregor NRVOCandidate != 0), 12005077c3876beeaed32280af88244e8050078619a8Douglas Gregor SourceLocation(), 12015077c3876beeaed32280af88244e8050078619a8Douglas Gregor Owned(RetValExp)); 12025077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 12035077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 12045077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 12055077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 12064cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 12075077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 12085077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 12095077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 121066724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 12115077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12125077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (RetValExp) 12135077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp); 12145077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 1215898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 12165077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12175077c3876beeaed32280af88244e8050078619a8Douglas Gregor // If we need to check for the named return value optimization, save the 12185077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 12195077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 12205077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 12215077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 12225077c3876beeaed32280af88244e8050078619a8Douglas Gregor 12235077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 12245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 12255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1226810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1227810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1228810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1229810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1230810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1231810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1232810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 1233810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 1234703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson // Type dependent expressions will be checked during instantiation. 1235703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson if (E->isTypeDependent()) 1236703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson return false; 1237703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson 1238810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E->isLvalue(S.Context) == Expr::LV_Valid) 1239810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 1240810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1241810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 1242810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 1243810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 1244810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { 1245810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 1246810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 1247810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1248810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 1249810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 1250810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 1251810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 1252810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 1253810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 1254810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1255810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 1256810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 1257810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 1258810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 1259810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 126060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, 12613037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsSimple, 12623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl bool IsVolatile, 12633037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumOutputs, 12643037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumInputs, 1265ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson IdentifierInfo **Names, 12663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg constraints, 12673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg exprs, 12689ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *asmString, 12693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl MultiExprArg clobbers, 12703b11fd3b52e7b88233c602407c151d07cb093e75Mike Stump SourceLocation RParenLoc, 12713b11fd3b52e7b88233c602407c151d07cb093e75Mike Stump bool MSAsm) { 12723037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 12733037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 12743037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 12759ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr **Exprs = exprs.get(); 12769ae2f076ca5ab1feb3ba95629099ec2319833701John McCall StringLiteral *AsmString = cast<StringLiteral>(asmString); 12773037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 12783037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 127903eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 12801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12811708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 12826bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (AsmString->isWide()) 12833037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 12843037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 12853037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 12861708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 12871708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 12886bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 12893037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 12903037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 12913037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1292ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson llvm::StringRef OutputName; 1293ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 1294ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson OutputName = Names[i]->getName(); 1295ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 1296ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); 1297432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 12983037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1299432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 1300432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 13013037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1302d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 130372056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 1304810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 130572056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 1306dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 130772056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 130804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 131044def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 131104728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13123037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1313806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1314806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 131504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 13161708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 13176bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 13183037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 13193037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 13203037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1321ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson llvm::StringRef InputName; 1322ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 1323ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson InputName = Names[i]->getName(); 1324ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 1325ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); 1326beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 13272819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 13283037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 1329432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 1330432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 1331d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 13323037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 133372056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 13343037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1335d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 133644def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 1337810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 133872056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1339d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 1340432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 134172056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 134204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 134444def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 1345d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 134672056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 1347d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 13481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 134972056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 1350d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 1351d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 13521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1353a873dfc9e7314681bb37efd9ab185045de121e43Douglas Gregor DefaultFunctionArrayLvalueConversion(Exprs[i]); 13541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1355806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 135604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 13573037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 13586fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 13591708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 13601708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 13616bc52112dbc54551bd8e215d95bba4791b2275f7Chris Lattner if (Literal->isWide()) 13623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 13633037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 13643037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1365fdba9c069023f686e2608affde02c82131ee1cf8Anders Carlsson llvm::StringRef Clobber = Literal->getString(); 13663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1367fdba9c069023f686e2608affde02c82131ee1cf8Anders Carlsson if (!Context.Target.isValidGCCRegisterName(Clobber)) 13683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 13697765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 13706fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 13713037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 1372fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 1373966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, 1374966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson NumOutputs, NumInputs, Names, Constraints, Exprs, 1375966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson AsmString, NumClobbers, Clobbers, RParenLoc); 1376fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 1377fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 1378fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 1379fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1380fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 13812ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 13822ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 1383fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 1384fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 13851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1386806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 1387806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 1388806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 13891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1390806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 1391806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 1392806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 1393806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 13941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1395806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 1396f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 1397c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Expr *InputExpr = Exprs[i+NumOutputs]; 13987adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 13997adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 14007adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 1401806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 14021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1403aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Decide if the input and output are in the same domain (integer/ptr or 1404aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // floating point. 1405aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner enum AsmDomain { 1406aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AD_Int, AD_FP, AD_Other 1407aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } InputDomain, OutputDomain; 1408aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1409aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InTy->isIntegerType() || InTy->isPointerType()) 1410aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Int; 14110c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (InTy->isRealFloatingType()) 1412aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_FP; 1413aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1414aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Other; 14153351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 1416aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutTy->isIntegerType() || OutTy->isPointerType()) 1417aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Int; 14180c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (OutTy->isRealFloatingType()) 1419aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_FP; 1420aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1421aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Other; 1422aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1423aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // They are ok if they are the same size and in the same domain. This 1424aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // allows tying things like: 1425aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int* 1426aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int if they are the same size. 1427aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // double to long double if they are the same size. 1428aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // 1429aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 1430aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 1431aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutSize == InSize && InputDomain == OutputDomain && 1432aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain != AD_Other) 1433aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 1434aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1435aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 1436aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // then we can promote it and the asm string won't notice. Check this 1437aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // case now. 1438aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner bool SmallerValueMentioned = false; 1439aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { 1440aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AsmStmt::AsmStringPiece &Piece = Pieces[p]; 1441aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!Piece.isOperand()) continue; 1442aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1443aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If this is a reference to the input and if the input was the smaller 1444aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // one, then we have to reject this asm. 1445aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Piece.getOperandNo() == i+NumOutputs) { 1446aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InSize < OutSize) { 1447aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner SmallerValueMentioned = true; 1448aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner break; 14493351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner } 1450f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner } 14511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1452aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If this is a reference to the input and if the input was the smaller 1453aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // one, then we have to reject this asm. 1454aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Piece.getOperandNo() == TiedTo) { 1455aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InSize > OutSize) { 1456aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner SmallerValueMentioned = true; 1457aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner break; 1458aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } 1459aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } 1460806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 14611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1462aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 1463aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // output was a register, just extend the shorter one to the size of the 1464aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // larger one. 1465aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!SmallerValueMentioned && InputDomain != AD_Other && 1466aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 1467aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 1468aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1469c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 1470806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 14717adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 1472806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 1473806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 1474806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 14751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1476fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 1477fe795956194141c91ae555985c9b930595bff43fChris Lattner} 14783b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 147960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1480431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 1481d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall SourceLocation RParen, Decl *Parm, 14829ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *Body) { 1483d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall VarDecl *Var = cast_or_null<VarDecl>(Parm); 1484160b5630aa781ac348303e1ae088d27016637778Douglas Gregor if (Var && Var->isInvalidDecl()) 1485160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return StmtError(); 1486160b5630aa781ac348303e1ae088d27016637778Douglas Gregor 14879ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); 14883b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 14893b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 149060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 14919ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { 14929ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); 1493161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 1494bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 149560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 14969ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, 14979ae2f076ca5ab1feb3ba95629099ec2319833701John McCall MultiStmtArg CatchStmts, Stmt *Finally) { 1498781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 14998f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor unsigned NumCatchStmts = CatchStmts.size(); 15009ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, 15019ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CatchStmts.release(), 15028f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor NumCatchStmts, 15039ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Finally)); 1504bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 1505bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 150660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, 15079ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Throw) { 1508d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (Throw) { 1509d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor QualType ThrowType = Throw->getType(); 1510d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor // Make sure the expression type is an ObjC pointer or "void *". 1511d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!ThrowType->isDependentType() && 1512d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor !ThrowType->isObjCObjectPointerType()) { 1513d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor const PointerType *PT = ThrowType->getAs<PointerType>(); 1514d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!PT || !PT->getPointeeType()->isVoidType()) 1515d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 1516d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor << Throw->getType() << Throw->getSourceRange()); 1517d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1518d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1519d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 15209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); 1521d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor} 1522d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 152360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 15249ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, 1525d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Scope *CurScope) { 15269ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Throw) { 1527e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 1528e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 1529e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 1530e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 1531e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 1532e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 15334ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 1534d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 1535d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 15369ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return BuildObjCAtThrowStmt(AtLoc, Throw); 153739f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 1538bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 153960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 15409ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, 15419ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SyncBody) { 1542781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 154346c3c4ba78766ac0f1c5ec631b424773e21f5271Chris Lattner 1544a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 15458fdc13a78a43f09ac396e682c35d57ca0b48216dDouglas Gregor if (!SyncExpr->getType()->isDependentType() && 15468fdc13a78a43f09ac396e682c35d57ca0b48216dDouglas Gregor !SyncExpr->getType()->isObjCObjectPointerType()) { 15476217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); 1548a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner if (!PT || !PT->getPointeeType()->isVoidType()) 1549a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) 1550a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner << SyncExpr->getType() << SyncExpr->getSourceRange()); 1551a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 15521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15539ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); 1554fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 15554b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 15564b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 15574b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 155860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1559d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, 15609ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *HandlerBlock) { 15614b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 15628189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 1563d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall cast_or_null<VarDecl>(ExDecl), 15649ae2f076ca5ab1feb3ba95629099ec2319833701John McCall HandlerBlock)); 15654b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 15668351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 15673c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 15683c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 1569c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 1570c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 1571c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 1572c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 1573c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 1574c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 1575c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 15760953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 15770953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 1578c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 15790953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 1580c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 15810953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 1582c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 1583c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 1584c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 1585c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1587c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 15880953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 1589c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 15901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1591c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 1592c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 1593c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 1594c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1595c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 1596c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 15973c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 15983c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 15998351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 16008351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 160160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 16029ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, 16038351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 16048351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 16058351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 16068351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 16079ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt **Handlers = RawHandlers.get(); 16088351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 1609c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; 16101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 16128351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); 1613c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 1614c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 1615c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 1616c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 16171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1618c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 1619c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1621c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 1622c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 1623c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 1624c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 1625c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 1626c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 1627c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 1628c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 16291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1630c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 1631c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 1632c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 16331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1634c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 1635c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 1636c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 1637c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 1638c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 1639c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 1640c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 1641c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1643c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 1644c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 16458351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 16461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1647781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 1648b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 16498351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 16508351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 16518351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 16528351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 16538351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 16548351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 16559ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, 1656a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig Handlers, NumHandlers)); 16578351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 1658