Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1 | //===--- SemaStmt.cpp - Semantic Analysis for Statements ------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 0bc735f | 2007-12-29 19:59:25 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements semantic analysis for statements. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
John McCall | 2d88708 | 2010-08-25 22:03:47 +0000 | [diff] [blame] | 14 | #include "clang/Sema/SemaInternal.h" |
John McCall | 5f1e094 | 2010-08-24 08:50:51 +0000 | [diff] [blame] | 15 | #include "clang/Sema/Scope.h" |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 16 | #include "clang/Sema/ScopeInfo.h" |
Douglas Gregor | e737f50 | 2010-08-12 20:07:10 +0000 | [diff] [blame] | 17 | #include "clang/Sema/Initialization.h" |
Richard Smith | ad762fc | 2011-04-14 22:09:26 +0000 | [diff] [blame] | 18 | #include "clang/Sema/Lookup.h" |
Anders Carlsson | 51fe996 | 2008-11-22 21:04:56 +0000 | [diff] [blame] | 19 | #include "clang/AST/APValue.h" |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 20 | #include "clang/AST/ASTContext.h" |
Daniel Dunbar | c4a1dea | 2008-08-11 05:35:13 +0000 | [diff] [blame] | 21 | #include "clang/AST/DeclObjC.h" |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 22 | #include "clang/AST/ExprCXX.h" |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 23 | #include "clang/AST/ExprObjC.h" |
Chris Lattner | 16f0049 | 2009-04-26 01:32:48 +0000 | [diff] [blame] | 24 | #include "clang/AST/StmtObjC.h" |
| 25 | #include "clang/AST/StmtCXX.h" |
John McCall | 209acbd | 2010-04-06 22:24:14 +0000 | [diff] [blame] | 26 | #include "clang/AST/TypeLoc.h" |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 27 | #include "clang/Lex/Preprocessor.h" |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 28 | #include "clang/Basic/TargetInfo.h" |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 29 | #include "llvm/ADT/ArrayRef.h" |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 30 | #include "llvm/ADT/STLExtras.h" |
| 31 | #include "llvm/ADT/SmallVector.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 32 | using namespace clang; |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 33 | using namespace sema; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 34 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 35 | StmtResult Sema::ActOnExprStmt(FullExprArg expr) { |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 36 | Expr *E = expr.get(); |
Douglas Gregor | bebbe0d | 2010-12-15 01:34:56 +0000 | [diff] [blame] | 37 | if (!E) // FIXME: FullExprArg has no error state? |
| 38 | return StmtError(); |
| 39 | |
Chris Lattner | 834a72a | 2008-07-25 23:18:17 +0000 | [diff] [blame] | 40 | // C99 6.8.3p2: The expression in an expression statement is evaluated as a |
| 41 | // void expression for its side effects. Conversion to void allows any |
| 42 | // operand, even incomplete types. |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 43 | |
Chris Lattner | 834a72a | 2008-07-25 23:18:17 +0000 | [diff] [blame] | 44 | // Same thing in for stmt first clause (when expr) and third clause. |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 45 | return Owned(static_cast<Stmt*>(E)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | |
Argyrios Kyrtzidis | b7d98d3 | 2011-04-27 05:04:02 +0000 | [diff] [blame] | 49 | StmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc, |
| 50 | SourceLocation LeadingEmptyMacroLoc) { |
| 51 | return Owned(new (Context) NullStmt(SemiLoc, LeadingEmptyMacroLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 52 | } |
| 53 | |
Chris Lattner | 337e550 | 2011-02-18 01:27:55 +0000 | [diff] [blame] | 54 | StmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, SourceLocation StartLoc, |
| 55 | SourceLocation EndLoc) { |
Chris Lattner | 682bf92 | 2009-03-29 16:50:03 +0000 | [diff] [blame] | 56 | DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 57 | |
Chris Lattner | 2040169 | 2009-04-12 20:13:14 +0000 | [diff] [blame] | 58 | // If we have an invalid decl, just return an error. |
| 59 | if (DG.isNull()) return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 60 | |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 61 | return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 62 | } |
| 63 | |
Fariborz Jahanian | a7cf23a | 2009-11-19 22:12:37 +0000 | [diff] [blame] | 64 | void Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { |
| 65 | DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 66 | |
Fariborz Jahanian | a7cf23a | 2009-11-19 22:12:37 +0000 | [diff] [blame] | 67 | // If we have an invalid decl, just return. |
| 68 | if (DG.isNull() || !DG.isSingleDecl()) return; |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 69 | VarDecl *var = cast<VarDecl>(DG.getSingleDecl()); |
| 70 | |
Fariborz Jahanian | a7cf23a | 2009-11-19 22:12:37 +0000 | [diff] [blame] | 71 | // suppress any potential 'unused variable' warning. |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 72 | var->setUsed(); |
| 73 | |
| 74 | // In ARC, we don't want to lifetime for the iteration |
| 75 | // variable of a fast enumeration loop. Rather than actually |
| 76 | // trying to catch that during declaration processing, we |
| 77 | // remove the consequences here. |
| 78 | if (getLangOptions().ObjCAutoRefCount) { |
| 79 | SplitQualType split = var->getType().split(); |
| 80 | |
| 81 | // Inferred lifetime will show up as a local qualifier because |
| 82 | // explicit lifetime would have shown up as an AttributedType |
| 83 | // instead. |
| 84 | if (split.second.hasObjCLifetime()) { |
| 85 | // Change the qualification to 'const __unsafe_unretained'. |
| 86 | split.second.setObjCLifetime(Qualifiers::OCL_ExplicitNone); |
| 87 | split.second.addConst(); |
| 88 | var->setType(Context.getQualifiedType(split.first, split.second)); |
| 89 | var->setInit(0); |
| 90 | } |
| 91 | } |
Fariborz Jahanian | a7cf23a | 2009-11-19 22:12:37 +0000 | [diff] [blame] | 92 | } |
| 93 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 94 | void Sema::DiagnoseUnusedExprResult(const Stmt *S) { |
Argyrios Kyrtzidis | d2827af | 2010-09-19 21:21:10 +0000 | [diff] [blame] | 95 | if (const LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S)) |
| 96 | return DiagnoseUnusedExprResult(Label->getSubStmt()); |
| 97 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 98 | const Expr *E = dyn_cast_or_null<Expr>(S); |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 99 | if (!E) |
| 100 | return; |
| 101 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 102 | SourceLocation Loc; |
| 103 | SourceRange R1, R2; |
Mike Stump | df317bf | 2009-11-03 23:25:48 +0000 | [diff] [blame] | 104 | if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 105 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 106 | |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 107 | // Okay, we have an unused result. Depending on what the base expression is, |
| 108 | // we might want to make a more specific diagnostic. Check for one of these |
| 109 | // cases now. |
| 110 | unsigned DiagID = diag::warn_unused_expr; |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 111 | if (const ExprWithCleanups *Temps = dyn_cast<ExprWithCleanups>(E)) |
Douglas Gregor | 4dffad6 | 2010-02-11 22:55:30 +0000 | [diff] [blame] | 112 | E = Temps->getSubExpr(); |
Chandler Carruth | 34d4947 | 2011-02-21 00:56:56 +0000 | [diff] [blame] | 113 | if (const CXXBindTemporaryExpr *TempExpr = dyn_cast<CXXBindTemporaryExpr>(E)) |
| 114 | E = TempExpr->getSubExpr(); |
John McCall | 12f78a6 | 2010-12-02 01:19:52 +0000 | [diff] [blame] | 115 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 116 | E = E->IgnoreParenImpCasts(); |
Chris Lattner | bc8d42c | 2009-10-13 04:53:48 +0000 | [diff] [blame] | 117 | if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { |
John McCall | 0faede6 | 2010-03-12 07:11:26 +0000 | [diff] [blame] | 118 | if (E->getType()->isVoidType()) |
| 119 | return; |
| 120 | |
Chris Lattner | bc8d42c | 2009-10-13 04:53:48 +0000 | [diff] [blame] | 121 | // If the callee has attribute pure, const, or warn_unused_result, warn with |
| 122 | // a more specific message to make it clear what is happening. |
Nuno Lopes | d20254f | 2009-12-20 23:11:08 +0000 | [diff] [blame] | 123 | if (const Decl *FD = CE->getCalleeDecl()) { |
Chris Lattner | bc8d42c | 2009-10-13 04:53:48 +0000 | [diff] [blame] | 124 | if (FD->getAttr<WarnUnusedResultAttr>()) { |
| 125 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; |
| 126 | return; |
| 127 | } |
| 128 | if (FD->getAttr<PureAttr>()) { |
| 129 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; |
| 130 | return; |
| 131 | } |
| 132 | if (FD->getAttr<ConstAttr>()) { |
| 133 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; |
| 134 | return; |
| 135 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 136 | } |
John McCall | 12f78a6 | 2010-12-02 01:19:52 +0000 | [diff] [blame] | 137 | } else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 138 | if (getLangOptions().ObjCAutoRefCount && ME->isDelegateInitCall()) { |
| 139 | Diag(Loc, diag::err_arc_unused_init_message) << R1; |
| 140 | return; |
| 141 | } |
Fariborz Jahanian | f031774 | 2010-03-30 18:22:15 +0000 | [diff] [blame] | 142 | const ObjCMethodDecl *MD = ME->getMethodDecl(); |
| 143 | if (MD && MD->getAttr<WarnUnusedResultAttr>()) { |
| 144 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; |
| 145 | return; |
| 146 | } |
John McCall | 12f78a6 | 2010-12-02 01:19:52 +0000 | [diff] [blame] | 147 | } else if (isa<ObjCPropertyRefExpr>(E)) { |
| 148 | DiagID = diag::warn_unused_property_expr; |
Douglas Gregor | d6e44a3 | 2010-04-16 22:09:46 +0000 | [diff] [blame] | 149 | } else if (const CXXFunctionalCastExpr *FC |
| 150 | = dyn_cast<CXXFunctionalCastExpr>(E)) { |
| 151 | if (isa<CXXConstructExpr>(FC->getSubExpr()) || |
| 152 | isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) |
| 153 | return; |
Fariborz Jahanian | f031774 | 2010-03-30 18:22:15 +0000 | [diff] [blame] | 154 | } |
John McCall | 209acbd | 2010-04-06 22:24:14 +0000 | [diff] [blame] | 155 | // Diagnose "(void*) blah" as a typo for "(void) blah". |
| 156 | else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { |
| 157 | TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); |
| 158 | QualType T = TI->getType(); |
| 159 | |
| 160 | // We really do want to use the non-canonical type here. |
| 161 | if (T == Context.VoidPtrTy) { |
| 162 | PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); |
| 163 | |
| 164 | Diag(Loc, diag::warn_unused_voidptr) |
| 165 | << FixItHint::CreateRemoval(TL.getStarLoc()); |
| 166 | return; |
| 167 | } |
| 168 | } |
| 169 | |
Ted Kremenek | 351ba91 | 2011-02-23 01:52:04 +0000 | [diff] [blame] | 170 | DiagRuntimeBehavior(Loc, 0, PDiag(DiagID) << R1 << R2); |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 171 | } |
| 172 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 173 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 174 | Sema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 175 | MultiStmtArg elts, bool isStmtExpr) { |
| 176 | unsigned NumElts = elts.size(); |
| 177 | Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 178 | // If we're in C89 mode, check that we don't have any decls after stmts. If |
| 179 | // so, emit an extension diagnostic. |
| 180 | if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { |
| 181 | // Note that __extension__ can be around a decl. |
| 182 | unsigned i = 0; |
| 183 | // Skip over all declarations. |
| 184 | for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) |
| 185 | /*empty*/; |
| 186 | |
| 187 | // We found the end of the list or a statement. Scan for another declstmt. |
| 188 | for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) |
| 189 | /*empty*/; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 190 | |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 191 | if (i != NumElts) { |
Douglas Gregor | 4afa39d | 2009-01-20 01:17:11 +0000 | [diff] [blame] | 192 | Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 193 | Diag(D->getLocation(), diag::ext_mixed_decls_code); |
| 194 | } |
| 195 | } |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 196 | // Warn about unused expressions in statements. |
| 197 | for (unsigned i = 0; i != NumElts; ++i) { |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 198 | // Ignore statements that are last in a statement expression. |
| 199 | if (isStmtExpr && i == NumElts - 1) |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 200 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 201 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 202 | DiagnoseUnusedExprResult(Elts[i]); |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 203 | } |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 204 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 205 | return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 206 | } |
| 207 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 208 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 209 | Sema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, |
| 210 | SourceLocation DotDotDotLoc, Expr *RHSVal, |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 211 | SourceLocation ColonLoc) { |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 212 | assert((LHSVal != 0) && "missing expression in case statement"); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 213 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 214 | // C99 6.8.4.2p3: The expression shall be an integer constant. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 215 | // However, GCC allows any evaluatable integer expression. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 216 | if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 217 | VerifyIntegerConstantExpression(LHSVal)) |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 218 | return StmtError(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 219 | |
Chris Lattner | 6c36be5 | 2007-07-18 02:28:47 +0000 | [diff] [blame] | 220 | // GCC extension: The expression shall be an integer constant. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 221 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 222 | if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && |
| 223 | VerifyIntegerConstantExpression(RHSVal)) { |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 224 | RHSVal = 0; // Recover by just forgetting about it. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 225 | } |
| 226 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 227 | if (getCurFunction()->SwitchStack.empty()) { |
Chris Lattner | 8a87e57 | 2007-07-23 17:05:23 +0000 | [diff] [blame] | 228 | Diag(CaseLoc, diag::err_case_not_in_switch); |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 229 | return StmtError(); |
Chris Lattner | 8a87e57 | 2007-07-23 17:05:23 +0000 | [diff] [blame] | 230 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 231 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 232 | CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, |
| 233 | ColonLoc); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 234 | getCurFunction()->SwitchStack.back()->addSwitchCase(CS); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 235 | return Owned(CS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 236 | } |
| 237 | |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 238 | /// ActOnCaseStmtBody - This installs a statement as the body of a case. |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 239 | void Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 240 | CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 241 | CS->setSubStmt(SubStmt); |
| 242 | } |
| 243 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 244 | StmtResult |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 245 | Sema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 246 | Stmt *SubStmt, Scope *CurScope) { |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 247 | if (getCurFunction()->SwitchStack.empty()) { |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 248 | Diag(DefaultLoc, diag::err_default_not_in_switch); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 249 | return Owned(SubStmt); |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 250 | } |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 251 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 252 | DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 253 | getCurFunction()->SwitchStack.back()->addSwitchCase(DS); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 254 | return Owned(DS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 255 | } |
| 256 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 257 | StmtResult |
Chris Lattner | 57ad378 | 2011-02-17 20:34:02 +0000 | [diff] [blame] | 258 | Sema::ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl, |
| 259 | SourceLocation ColonLoc, Stmt *SubStmt) { |
| 260 | |
Chris Lattner | ad8dcf4 | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 261 | // If the label was multiply defined, reject it now. |
| 262 | if (TheDecl->getStmt()) { |
| 263 | Diag(IdentLoc, diag::err_redefinition_of_label) << TheDecl->getDeclName(); |
| 264 | Diag(TheDecl->getLocation(), diag::note_previous_definition); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 265 | return Owned(SubStmt); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 266 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 267 | |
Chris Lattner | ad8dcf4 | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 268 | // Otherwise, things are good. Fill in the declaration and return it. |
Chris Lattner | ad8dcf4 | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 269 | LabelStmt *LS = new (Context) LabelStmt(IdentLoc, TheDecl, SubStmt); |
| 270 | TheDecl->setStmt(LS); |
Abramo Bagnara | 203548b | 2011-03-03 18:24:14 +0000 | [diff] [blame] | 271 | if (!TheDecl->isGnuLocal()) |
| 272 | TheDecl->setLocation(IdentLoc); |
Chris Lattner | ad8dcf4 | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 273 | return Owned(LS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 274 | } |
| 275 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 276 | StmtResult |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 277 | Sema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 278 | Stmt *thenStmt, SourceLocation ElseLoc, |
| 279 | Stmt *elseStmt) { |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 280 | ExprResult CondResult(CondVal.release()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 281 | |
Douglas Gregor | 8cfe5a7 | 2009-11-23 23:44:04 +0000 | [diff] [blame] | 282 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 283 | if (CondVar) { |
| 284 | ConditionVar = cast<VarDecl>(CondVar); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 285 | CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 286 | if (CondResult.isInvalid()) |
| 287 | return StmtError(); |
Douglas Gregor | 8cfe5a7 | 2009-11-23 23:44:04 +0000 | [diff] [blame] | 288 | } |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 289 | Expr *ConditionExpr = CondResult.takeAs<Expr>(); |
| 290 | if (!ConditionExpr) |
| 291 | return StmtError(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 292 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 293 | DiagnoseUnusedExprResult(thenStmt); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 294 | |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 295 | // Warn if the if block has a null body without an else value. |
| 296 | // this helps prevent bugs due to typos, such as |
| 297 | // if (condition); |
| 298 | // do_stuff(); |
Ted Kremenek | b319817 | 2010-09-16 00:37:05 +0000 | [diff] [blame] | 299 | // |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 300 | if (!elseStmt) { |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 301 | if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) |
Argyrios Kyrtzidis | a25b6a4 | 2010-11-19 20:54:25 +0000 | [diff] [blame] | 302 | // But do not warn if the body is a macro that expands to nothing, e.g: |
| 303 | // |
| 304 | // #define CALL(x) |
| 305 | // if (condition) |
| 306 | // CALL(0); |
| 307 | // |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 308 | if (!stmt->hasLeadingEmptyMacro()) |
Ted Kremenek | b319817 | 2010-09-16 00:37:05 +0000 | [diff] [blame] | 309 | Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 310 | } |
| 311 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 312 | DiagnoseUnusedExprResult(elseStmt); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 313 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 314 | return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 315 | thenStmt, ElseLoc, elseStmt)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 316 | } |
| 317 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 318 | /// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have |
| 319 | /// the specified width and sign. If an overflow occurs, detect it and emit |
| 320 | /// the specified diagnostic. |
| 321 | void Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, |
| 322 | unsigned NewWidth, bool NewSign, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 323 | SourceLocation Loc, |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 324 | unsigned DiagID) { |
| 325 | // Perform a conversion to the promoted condition type if needed. |
| 326 | if (NewWidth > Val.getBitWidth()) { |
| 327 | // If this is an extension, just do it. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 328 | Val = Val.extend(NewWidth); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 329 | Val.setIsSigned(NewSign); |
Douglas Gregor | f9f627d | 2010-03-01 01:04:55 +0000 | [diff] [blame] | 330 | |
| 331 | // If the input was signed and negative and the output is |
| 332 | // unsigned, don't bother to warn: this is implementation-defined |
| 333 | // behavior. |
| 334 | // FIXME: Introduce a second, default-ignored warning for this case? |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 335 | } else if (NewWidth < Val.getBitWidth()) { |
| 336 | // If this is a truncation, check for overflow. |
| 337 | llvm::APSInt ConvVal(Val); |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 338 | ConvVal = ConvVal.trunc(NewWidth); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 339 | ConvVal.setIsSigned(NewSign); |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 340 | ConvVal = ConvVal.extend(Val.getBitWidth()); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 341 | ConvVal.setIsSigned(Val.isSigned()); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 342 | if (ConvVal != Val) |
Chris Lattner | d3a94e2 | 2008-11-20 06:06:08 +0000 | [diff] [blame] | 343 | Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 344 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 345 | // Regardless of whether a diagnostic was emitted, really do the |
| 346 | // truncation. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 347 | Val = Val.trunc(NewWidth); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 348 | Val.setIsSigned(NewSign); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 349 | } else if (NewSign != Val.isSigned()) { |
| 350 | // Convert the sign to match the sign of the condition. This can cause |
| 351 | // overflow as well: unsigned(INTMIN) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 352 | // We don't diagnose this overflow, because it is implementation-defined |
Douglas Gregor | 2853eac | 2010-02-18 00:56:01 +0000 | [diff] [blame] | 353 | // behavior. |
| 354 | // FIXME: Introduce a second, default-ignored warning for this case? |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 355 | llvm::APSInt OldVal(Val); |
| 356 | Val.setIsSigned(NewSign); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 357 | } |
| 358 | } |
| 359 | |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 360 | namespace { |
| 361 | struct CaseCompareFunctor { |
| 362 | bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| 363 | const llvm::APSInt &RHS) { |
| 364 | return LHS.first < RHS; |
| 365 | } |
Chris Lattner | 0e85a27 | 2007-09-03 18:31:57 +0000 | [diff] [blame] | 366 | bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| 367 | const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| 368 | return LHS.first < RHS.first; |
| 369 | } |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 370 | bool operator()(const llvm::APSInt &LHS, |
| 371 | const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| 372 | return LHS < RHS.first; |
| 373 | } |
| 374 | }; |
| 375 | } |
| 376 | |
Chris Lattner | 764a7ce | 2007-09-21 18:15:22 +0000 | [diff] [blame] | 377 | /// CmpCaseVals - Comparison predicate for sorting case values. |
| 378 | /// |
| 379 | static bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, |
| 380 | const std::pair<llvm::APSInt, CaseStmt*>& rhs) { |
| 381 | if (lhs.first < rhs.first) |
| 382 | return true; |
| 383 | |
| 384 | if (lhs.first == rhs.first && |
| 385 | lhs.second->getCaseLoc().getRawEncoding() |
| 386 | < rhs.second->getCaseLoc().getRawEncoding()) |
| 387 | return true; |
| 388 | return false; |
| 389 | } |
| 390 | |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 391 | /// CmpEnumVals - Comparison predicate for sorting enumeration values. |
| 392 | /// |
| 393 | static bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, |
| 394 | const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) |
| 395 | { |
| 396 | return lhs.first < rhs.first; |
| 397 | } |
| 398 | |
| 399 | /// EqEnumVals - Comparison preficate for uniqing enumeration values. |
| 400 | /// |
| 401 | static bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, |
| 402 | const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) |
| 403 | { |
| 404 | return lhs.first == rhs.first; |
| 405 | } |
| 406 | |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 407 | /// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of |
| 408 | /// potentially integral-promoted expression @p expr. |
| 409 | static QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { |
John McCall | 6907fbe | 2010-06-12 01:56:02 +0000 | [diff] [blame] | 410 | if (const CastExpr *ImplicitCast = dyn_cast<ImplicitCastExpr>(expr)) { |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 411 | const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); |
| 412 | QualType TypeBeforePromotion = ExprBeforePromotion->getType(); |
Douglas Gregor | 2ade35e | 2010-06-16 00:17:44 +0000 | [diff] [blame] | 413 | if (TypeBeforePromotion->isIntegralOrEnumerationType()) { |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 414 | return TypeBeforePromotion; |
| 415 | } |
| 416 | } |
| 417 | return expr->getType(); |
| 418 | } |
| 419 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 420 | StmtResult |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 421 | Sema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 422 | Decl *CondVar) { |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 423 | ExprResult CondResult; |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 424 | |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 425 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 426 | if (CondVar) { |
| 427 | ConditionVar = cast<VarDecl>(CondVar); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 428 | CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); |
| 429 | if (CondResult.isInvalid()) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 430 | return StmtError(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 431 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 432 | Cond = CondResult.release(); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 433 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 434 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 435 | if (!Cond) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 436 | return StmtError(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 437 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 438 | CondResult |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 439 | = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, |
Douglas Gregor | c30614b | 2010-06-29 23:17:37 +0000 | [diff] [blame] | 440 | PDiag(diag::err_typecheck_statement_requires_integer), |
| 441 | PDiag(diag::err_switch_incomplete_class_type) |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 442 | << Cond->getSourceRange(), |
Douglas Gregor | c30614b | 2010-06-29 23:17:37 +0000 | [diff] [blame] | 443 | PDiag(diag::err_switch_explicit_conversion), |
| 444 | PDiag(diag::note_switch_conversion), |
| 445 | PDiag(diag::err_switch_multiple_conversions), |
Douglas Gregor | 6bc574d | 2010-06-30 00:20:43 +0000 | [diff] [blame] | 446 | PDiag(diag::note_switch_conversion), |
| 447 | PDiag(0)); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 448 | if (CondResult.isInvalid()) return StmtError(); |
| 449 | Cond = CondResult.take(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 450 | |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 451 | if (!CondVar) { |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 452 | CheckImplicitConversions(Cond, SwitchLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 453 | CondResult = MaybeCreateExprWithCleanups(Cond); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 454 | if (CondResult.isInvalid()) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 455 | return StmtError(); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 456 | Cond = CondResult.take(); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 457 | } |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 458 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 459 | getCurFunction()->setHasBranchIntoScope(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 460 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 461 | SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 462 | getCurFunction()->SwitchStack.push_back(SS); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 463 | return Owned(SS); |
Chris Lattner | 7e52de4 | 2010-01-24 01:50:29 +0000 | [diff] [blame] | 464 | } |
| 465 | |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 466 | static void AdjustAPSInt(llvm::APSInt &Val, unsigned BitWidth, bool IsSigned) { |
| 467 | if (Val.getBitWidth() < BitWidth) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 468 | Val = Val.extend(BitWidth); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 469 | else if (Val.getBitWidth() > BitWidth) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 470 | Val = Val.trunc(BitWidth); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 471 | Val.setIsSigned(IsSigned); |
| 472 | } |
| 473 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 474 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 475 | Sema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, |
| 476 | Stmt *BodyStmt) { |
| 477 | SwitchStmt *SS = cast<SwitchStmt>(Switch); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 478 | assert(SS == getCurFunction()->SwitchStack.back() && |
| 479 | "switch stack missing push/pop!"); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 480 | |
Steve Naroff | 9dcbfa4 | 2007-09-01 21:08:38 +0000 | [diff] [blame] | 481 | SS->setBody(BodyStmt, SwitchLoc); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 482 | getCurFunction()->SwitchStack.pop_back(); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 483 | |
Douglas Gregor | ff331c1 | 2010-07-25 18:17:45 +0000 | [diff] [blame] | 484 | if (SS->getCond() == 0) |
Douglas Gregor | be724ba | 2009-11-25 06:20:02 +0000 | [diff] [blame] | 485 | return StmtError(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 486 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 487 | Expr *CondExpr = SS->getCond(); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 488 | Expr *CondExprBeforePromotion = CondExpr; |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 489 | QualType CondTypeBeforePromotion = |
| 490 | GetTypeBeforeIntegralPromotion(CondExpr); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 491 | |
Douglas Gregor | 0de55e7 | 2009-11-25 15:17:36 +0000 | [diff] [blame] | 492 | // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 493 | ExprResult CondResult = UsualUnaryConversions(CondExpr); |
| 494 | if (CondResult.isInvalid()) |
| 495 | return StmtError(); |
| 496 | CondExpr = CondResult.take(); |
Douglas Gregor | a0d3ca1 | 2009-11-25 05:02:21 +0000 | [diff] [blame] | 497 | QualType CondType = CondExpr->getType(); |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 498 | SS->setCond(CondExpr); |
| 499 | |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 500 | // C++ 6.4.2.p2: |
| 501 | // Integral promotions are performed (on the switch condition). |
| 502 | // |
| 503 | // A case value unrepresentable by the original switch condition |
| 504 | // type (before the promotion) doesn't make sense, even when it can |
| 505 | // be represented by the promoted type. Therefore we need to find |
| 506 | // the pre-promotion type of the switch condition. |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 507 | if (!CondExpr->isTypeDependent()) { |
Douglas Gregor | acb0bd8 | 2010-06-29 23:25:20 +0000 | [diff] [blame] | 508 | // We have already converted the expression to an integral or enumeration |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 509 | // type, when we started the switch statement. If we don't have an |
Douglas Gregor | acb0bd8 | 2010-06-29 23:25:20 +0000 | [diff] [blame] | 510 | // appropriate type now, just return an error. |
| 511 | if (!CondType->isIntegralOrEnumerationType()) |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 512 | return StmtError(); |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 513 | |
Chris Lattner | 2b334bb | 2010-04-16 23:34:13 +0000 | [diff] [blame] | 514 | if (CondExpr->isKnownToHaveBooleanValue()) { |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 515 | // switch(bool_expr) {...} is often a programmer error, e.g. |
| 516 | // switch(n && mask) { ... } // Doh - should be "n & mask". |
| 517 | // One can always use an if statement instead of switch(bool_expr). |
| 518 | Diag(SwitchLoc, diag::warn_bool_switch_condition) |
| 519 | << CondExpr->getSourceRange(); |
| 520 | } |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 521 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 522 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 523 | // Get the bitwidth of the switched-on value before promotions. We must |
| 524 | // convert the integer case values to this width before comparison. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 525 | bool HasDependentValue |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 526 | = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 527 | unsigned CondWidth |
Chris Lattner | 1d6ab7a | 2011-02-24 07:31:28 +0000 | [diff] [blame] | 528 | = HasDependentValue ? 0 : Context.getIntWidth(CondTypeBeforePromotion); |
Douglas Gregor | 575a1c9 | 2011-05-20 16:38:50 +0000 | [diff] [blame] | 529 | bool CondIsSigned |
| 530 | = CondTypeBeforePromotion->isSignedIntegerOrEnumerationType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 531 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 532 | // Accumulate all of the case values in a vector so that we can sort them |
| 533 | // and detect duplicates. This vector contains the APInt for the case after |
| 534 | // it has been converted to the condition type. |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 535 | typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; |
| 536 | CaseValsTy CaseVals; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 537 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 538 | // Keep track of any GNU case ranges we see. The APSInt is the low value. |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 539 | typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; |
| 540 | CaseRangesTy CaseRanges; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 541 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 542 | DefaultStmt *TheDefaultStmt = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 543 | |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 544 | bool CaseListIsErroneous = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 545 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 546 | for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 547 | SC = SC->getNextSwitchCase()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 548 | |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 549 | if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 550 | if (TheDefaultStmt) { |
| 551 | Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); |
Chris Lattner | 5f4a682 | 2008-11-23 23:12:31 +0000 | [diff] [blame] | 552 | Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 553 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 554 | // FIXME: Remove the default statement from the switch block so that |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 555 | // we'll return a valid AST. This requires recursing down the AST and |
| 556 | // finding it, not something we are set up to do right now. For now, |
| 557 | // just lop the entire switch stmt out of the AST. |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 558 | CaseListIsErroneous = true; |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 559 | } |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 560 | TheDefaultStmt = DS; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 561 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 562 | } else { |
| 563 | CaseStmt *CS = cast<CaseStmt>(SC); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 564 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 565 | // We already verified that the expression has a i-c-e value (C99 |
| 566 | // 6.8.4.2p3) - get that value now. |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 567 | Expr *Lo = CS->getLHS(); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 568 | |
| 569 | if (Lo->isTypeDependent() || Lo->isValueDependent()) { |
| 570 | HasDependentValue = true; |
| 571 | break; |
| 572 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 573 | |
Anders Carlsson | 51fe996 | 2008-11-22 21:04:56 +0000 | [diff] [blame] | 574 | llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 575 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 576 | // Convert the value to the same width/sign as the condition. |
| 577 | ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 578 | Lo->getLocStart(), |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 579 | diag::warn_case_value_overflow); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 580 | |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 581 | // If the LHS is not the same type as the condition, insert an implicit |
| 582 | // cast. |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 583 | Lo = ImpCastExprToType(Lo, CondType, CK_IntegralCast).take(); |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 584 | CS->setLHS(Lo); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 585 | |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 586 | // If this is a case range, remember it in CaseRanges, otherwise CaseVals. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 587 | if (CS->getRHS()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 588 | if (CS->getRHS()->isTypeDependent() || |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 589 | CS->getRHS()->isValueDependent()) { |
| 590 | HasDependentValue = true; |
| 591 | break; |
| 592 | } |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 593 | CaseRanges.push_back(std::make_pair(LoVal, CS)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 594 | } else |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 595 | CaseVals.push_back(std::make_pair(LoVal, CS)); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 596 | } |
| 597 | } |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 598 | |
| 599 | if (!HasDependentValue) { |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 600 | // If we don't have a default statement, check whether the |
| 601 | // condition is constant. |
| 602 | llvm::APSInt ConstantCondValue; |
| 603 | bool HasConstantCond = false; |
| 604 | bool ShouldCheckConstantCond = false; |
| 605 | if (!HasDependentValue && !TheDefaultStmt) { |
| 606 | Expr::EvalResult Result; |
| 607 | HasConstantCond = CondExprBeforePromotion->Evaluate(Result, Context); |
| 608 | if (HasConstantCond) { |
| 609 | assert(Result.Val.isInt() && "switch condition evaluated to non-int"); |
| 610 | ConstantCondValue = Result.Val.getInt(); |
| 611 | ShouldCheckConstantCond = true; |
| 612 | |
| 613 | assert(ConstantCondValue.getBitWidth() == CondWidth && |
| 614 | ConstantCondValue.isSigned() == CondIsSigned); |
| 615 | } |
| 616 | } |
| 617 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 618 | // Sort all the scalar case values so we can easily detect duplicates. |
| 619 | std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); |
| 620 | |
| 621 | if (!CaseVals.empty()) { |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 622 | for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { |
| 623 | if (ShouldCheckConstantCond && |
| 624 | CaseVals[i].first == ConstantCondValue) |
| 625 | ShouldCheckConstantCond = false; |
| 626 | |
| 627 | if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 628 | // If we have a duplicate, report it. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 629 | Diag(CaseVals[i].second->getLHS()->getLocStart(), |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 630 | diag::err_duplicate_case) << CaseVals[i].first.toString(10); |
| 631 | Diag(CaseVals[i-1].second->getLHS()->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 632 | diag::note_duplicate_case_prev); |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 633 | // FIXME: We really want to remove the bogus case stmt from the |
| 634 | // substmt, but we have no way to do this right now. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 635 | CaseListIsErroneous = true; |
| 636 | } |
| 637 | } |
| 638 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 639 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 640 | // Detect duplicate case ranges, which usually don't exist at all in |
| 641 | // the first place. |
| 642 | if (!CaseRanges.empty()) { |
| 643 | // Sort all the case ranges by their low value so we can easily detect |
| 644 | // overlaps between ranges. |
| 645 | std::stable_sort(CaseRanges.begin(), CaseRanges.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 646 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 647 | // Scan the ranges, computing the high values and removing empty ranges. |
| 648 | std::vector<llvm::APSInt> HiVals; |
| 649 | for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 650 | llvm::APSInt &LoVal = CaseRanges[i].first; |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 651 | CaseStmt *CR = CaseRanges[i].second; |
| 652 | Expr *Hi = CR->getRHS(); |
| 653 | llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 654 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 655 | // Convert the value to the same width/sign as the condition. |
| 656 | ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 657 | Hi->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 658 | diag::warn_case_value_overflow); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 659 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 660 | // If the LHS is not the same type as the condition, insert an implicit |
| 661 | // cast. |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 662 | Hi = ImpCastExprToType(Hi, CondType, CK_IntegralCast).take(); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 663 | CR->setRHS(Hi); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 664 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 665 | // If the low value is bigger than the high value, the case is empty. |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 666 | if (LoVal > HiVal) { |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 667 | Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) |
| 668 | << SourceRange(CR->getLHS()->getLocStart(), |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 669 | Hi->getLocEnd()); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 670 | CaseRanges.erase(CaseRanges.begin()+i); |
| 671 | --i, --e; |
| 672 | continue; |
| 673 | } |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 674 | |
| 675 | if (ShouldCheckConstantCond && |
| 676 | LoVal <= ConstantCondValue && |
| 677 | ConstantCondValue <= HiVal) |
| 678 | ShouldCheckConstantCond = false; |
| 679 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 680 | HiVals.push_back(HiVal); |
| 681 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 682 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 683 | // Rescan the ranges, looking for overlap with singleton values and other |
| 684 | // ranges. Since the range list is sorted, we only need to compare case |
| 685 | // ranges with their neighbors. |
| 686 | for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
| 687 | llvm::APSInt &CRLo = CaseRanges[i].first; |
| 688 | llvm::APSInt &CRHi = HiVals[i]; |
| 689 | CaseStmt *CR = CaseRanges[i].second; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 690 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 691 | // Check to see whether the case range overlaps with any |
| 692 | // singleton cases. |
| 693 | CaseStmt *OverlapStmt = 0; |
| 694 | llvm::APSInt OverlapVal(32); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 695 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 696 | // Find the smallest value >= the lower bound. If I is in the |
| 697 | // case range, then we have overlap. |
| 698 | CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), |
| 699 | CaseVals.end(), CRLo, |
| 700 | CaseCompareFunctor()); |
| 701 | if (I != CaseVals.end() && I->first < CRHi) { |
| 702 | OverlapVal = I->first; // Found overlap with scalar. |
| 703 | OverlapStmt = I->second; |
| 704 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 705 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 706 | // Find the smallest value bigger than the upper bound. |
| 707 | I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); |
| 708 | if (I != CaseVals.begin() && (I-1)->first >= CRLo) { |
| 709 | OverlapVal = (I-1)->first; // Found overlap with scalar. |
| 710 | OverlapStmt = (I-1)->second; |
| 711 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 712 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 713 | // Check to see if this case stmt overlaps with the subsequent |
| 714 | // case range. |
| 715 | if (i && CRLo <= HiVals[i-1]) { |
| 716 | OverlapVal = HiVals[i-1]; // Found overlap with range. |
| 717 | OverlapStmt = CaseRanges[i-1].second; |
| 718 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 719 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 720 | if (OverlapStmt) { |
| 721 | // If we have a duplicate, report it. |
| 722 | Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) |
| 723 | << OverlapVal.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 724 | Diag(OverlapStmt->getLHS()->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 725 | diag::note_duplicate_case_prev); |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 726 | // FIXME: We really want to remove the bogus case stmt from the |
| 727 | // substmt, but we have no way to do this right now. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 728 | CaseListIsErroneous = true; |
| 729 | } |
Chris Lattner | f334850 | 2007-08-23 14:29:07 +0000 | [diff] [blame] | 730 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 731 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 732 | |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 733 | // Complain if we have a constant condition and we didn't find a match. |
| 734 | if (!CaseListIsErroneous && ShouldCheckConstantCond) { |
| 735 | // TODO: it would be nice if we printed enums as enums, chars as |
| 736 | // chars, etc. |
| 737 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) |
| 738 | << ConstantCondValue.toString(10) |
| 739 | << CondExpr->getSourceRange(); |
| 740 | } |
| 741 | |
| 742 | // Check to see if switch is over an Enum and handles all of its |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 743 | // values. We only issue a warning if there is not 'default:', but |
| 744 | // we still do the analysis to preserve this information in the AST |
| 745 | // (which can be used by flow-based analyes). |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 746 | // |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 747 | const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>(); |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 748 | |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 749 | // If switch has default case, then ignore it. |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 750 | if (!CaseListIsErroneous && !HasConstantCond && ET) { |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 751 | const EnumDecl *ED = ET->getDecl(); |
Francois Pichet | 58f14c0 | 2011-06-02 00:47:27 +0000 | [diff] [blame] | 752 | typedef llvm::SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> |
| 753 | EnumValsTy; |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 754 | EnumValsTy EnumVals; |
| 755 | |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 756 | // Gather all enum values, set their type and sort them, |
| 757 | // allowing easier comparison with CaseVals. |
| 758 | for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 759 | EDI != ED->enumerator_end(); ++EDI) { |
| 760 | llvm::APSInt Val = EDI->getInitVal(); |
| 761 | AdjustAPSInt(Val, CondWidth, CondIsSigned); |
| 762 | EnumVals.push_back(std::make_pair(Val, *EDI)); |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 763 | } |
| 764 | std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 765 | EnumValsTy::iterator EIend = |
| 766 | std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 767 | |
| 768 | // See which case values aren't in enum. |
| 769 | // TODO: we might want to check whether case values are out of the |
| 770 | // enum even if we don't want to check whether all cases are handled. |
| 771 | if (!TheDefaultStmt) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 772 | EnumValsTy::const_iterator EI = EnumVals.begin(); |
| 773 | for (CaseValsTy::const_iterator CI = CaseVals.begin(); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 774 | CI != CaseVals.end(); CI++) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 775 | while (EI != EIend && EI->first < CI->first) |
| 776 | EI++; |
| 777 | if (EI == EIend || EI->first > CI->first) |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 778 | Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) |
| 779 | << ED->getDeclName(); |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 780 | } |
| 781 | // See which of case ranges aren't in enum |
| 782 | EI = EnumVals.begin(); |
| 783 | for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 784 | RI != CaseRanges.end() && EI != EIend; RI++) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 785 | while (EI != EIend && EI->first < RI->first) |
| 786 | EI++; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 787 | |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 788 | if (EI == EIend || EI->first != RI->first) { |
| 789 | Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) |
| 790 | << ED->getDeclName(); |
| 791 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 792 | |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 793 | llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 794 | AdjustAPSInt(Hi, CondWidth, CondIsSigned); |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 795 | while (EI != EIend && EI->first < Hi) |
| 796 | EI++; |
| 797 | if (EI == EIend || EI->first != Hi) |
| 798 | Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) |
| 799 | << ED->getDeclName(); |
| 800 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 801 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 802 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 803 | // Check which enum vals aren't in switch |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 804 | CaseValsTy::const_iterator CI = CaseVals.begin(); |
| 805 | CaseRangesTy::const_iterator RI = CaseRanges.begin(); |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 806 | bool hasCasesNotInSwitch = false; |
| 807 | |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 808 | llvm::SmallVector<DeclarationName,8> UnhandledNames; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 809 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 810 | for (EnumValsTy::const_iterator EI = EnumVals.begin(); EI != EIend; EI++){ |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 811 | // Drop unneeded case values |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 812 | llvm::APSInt CIVal; |
| 813 | while (CI != CaseVals.end() && CI->first < EI->first) |
| 814 | CI++; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 815 | |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 816 | if (CI != CaseVals.end() && CI->first == EI->first) |
| 817 | continue; |
| 818 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 819 | // Drop unneeded case ranges |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 820 | for (; RI != CaseRanges.end(); RI++) { |
| 821 | llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 822 | AdjustAPSInt(Hi, CondWidth, CondIsSigned); |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 823 | if (EI->first <= Hi) |
| 824 | break; |
| 825 | } |
| 826 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 827 | if (RI == CaseRanges.end() || EI->first < RI->first) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 828 | hasCasesNotInSwitch = true; |
| 829 | if (!TheDefaultStmt) |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 830 | UnhandledNames.push_back(EI->second->getDeclName()); |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 831 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 832 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 833 | |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 834 | // Produce a nice diagnostic if multiple values aren't handled. |
| 835 | switch (UnhandledNames.size()) { |
| 836 | case 0: break; |
| 837 | case 1: |
| 838 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case1) |
| 839 | << UnhandledNames[0]; |
| 840 | break; |
| 841 | case 2: |
| 842 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case2) |
| 843 | << UnhandledNames[0] << UnhandledNames[1]; |
| 844 | break; |
| 845 | case 3: |
| 846 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case3) |
| 847 | << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; |
| 848 | break; |
| 849 | default: |
| 850 | Diag(CondExpr->getExprLoc(), diag::warn_missing_cases) |
| 851 | << (unsigned)UnhandledNames.size() |
| 852 | << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; |
| 853 | break; |
| 854 | } |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 855 | |
| 856 | if (!hasCasesNotInSwitch) |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 857 | SS->setAllEnumCasesCovered(); |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 858 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 859 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 860 | |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 861 | // FIXME: If the case list was broken is some way, we don't have a good system |
| 862 | // to patch it up. Instead, just return the whole substmt as broken. |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 863 | if (CaseListIsErroneous) |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 864 | return StmtError(); |
| 865 | |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 866 | return Owned(SS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 867 | } |
| 868 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 869 | StmtResult |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 870 | Sema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 871 | Decl *CondVar, Stmt *Body) { |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 872 | ExprResult CondResult(Cond.release()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 873 | |
Douglas Gregor | 5656e14 | 2009-11-24 21:15:44 +0000 | [diff] [blame] | 874 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 875 | if (CondVar) { |
| 876 | ConditionVar = cast<VarDecl>(CondVar); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 877 | CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 878 | if (CondResult.isInvalid()) |
| 879 | return StmtError(); |
Douglas Gregor | 5656e14 | 2009-11-24 21:15:44 +0000 | [diff] [blame] | 880 | } |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 881 | Expr *ConditionExpr = CondResult.take(); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 882 | if (!ConditionExpr) |
| 883 | return StmtError(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 884 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 885 | DiagnoseUnusedExprResult(Body); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 886 | |
Douglas Gregor | 43dec6b | 2010-06-21 23:44:13 +0000 | [diff] [blame] | 887 | return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 888 | Body, WhileLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 889 | } |
| 890 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 891 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 892 | Sema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, |
Chris Lattner | 9891359 | 2009-06-12 23:04:47 +0000 | [diff] [blame] | 893 | SourceLocation WhileLoc, SourceLocation CondLParen, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 894 | Expr *Cond, SourceLocation CondRParen) { |
| 895 | assert(Cond && "ActOnDoStmt(): missing expression"); |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 896 | |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 897 | ExprResult CondResult = CheckBooleanCondition(Cond, DoLoc); |
| 898 | if (CondResult.isInvalid() || CondResult.isInvalid()) |
John McCall | 5a881bb | 2009-10-12 21:59:07 +0000 | [diff] [blame] | 899 | return StmtError(); |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 900 | Cond = CondResult.take(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 901 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 902 | CheckImplicitConversions(Cond, DoLoc); |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 903 | CondResult = MaybeCreateExprWithCleanups(Cond); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 904 | if (CondResult.isInvalid()) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 905 | return StmtError(); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 906 | Cond = CondResult.take(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 907 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 908 | DiagnoseUnusedExprResult(Body); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 909 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 910 | return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 911 | } |
| 912 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 913 | StmtResult |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 914 | Sema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 915 | Stmt *First, FullExprArg second, Decl *secondVar, |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 916 | FullExprArg third, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 917 | SourceLocation RParenLoc, Stmt *Body) { |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 918 | if (!getLangOptions().CPlusPlus) { |
| 919 | if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { |
Chris Lattner | f3a41af | 2008-11-20 06:38:18 +0000 | [diff] [blame] | 920 | // C99 6.8.5p3: The declaration part of a 'for' statement shall only |
| 921 | // declare identifiers for objects having storage class 'auto' or |
| 922 | // 'register'. |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 923 | for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); |
| 924 | DI!=DE; ++DI) { |
| 925 | VarDecl *VD = dyn_cast<VarDecl>(*DI); |
John McCall | b6bbcc9 | 2010-10-15 04:57:14 +0000 | [diff] [blame] | 926 | if (VD && VD->isLocalVarDecl() && !VD->hasLocalStorage()) |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 927 | VD = 0; |
| 928 | if (VD == 0) |
| 929 | Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); |
| 930 | // FIXME: mark decl erroneous! |
| 931 | } |
Chris Lattner | ae3b701 | 2007-08-28 05:03:08 +0000 | [diff] [blame] | 932 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 933 | } |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 934 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 935 | ExprResult SecondResult(second.release()); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 936 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 937 | if (secondVar) { |
| 938 | ConditionVar = cast<VarDecl>(secondVar); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 939 | SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 940 | if (SecondResult.isInvalid()) |
| 941 | return StmtError(); |
| 942 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 943 | |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 944 | Expr *Third = third.release().takeAs<Expr>(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 945 | |
Anders Carlsson | 3af708f | 2009-08-01 01:39:59 +0000 | [diff] [blame] | 946 | DiagnoseUnusedExprResult(First); |
| 947 | DiagnoseUnusedExprResult(Third); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 948 | DiagnoseUnusedExprResult(Body); |
| 949 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 950 | return Owned(new (Context) ForStmt(Context, First, |
| 951 | SecondResult.take(), ConditionVar, |
| 952 | Third, Body, ForLoc, LParenLoc, |
Douglas Gregor | 43dec6b | 2010-06-21 23:44:13 +0000 | [diff] [blame] | 953 | RParenLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 954 | } |
| 955 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 956 | /// In an Objective C collection iteration statement: |
| 957 | /// for (x in y) |
| 958 | /// x can be an arbitrary l-value expression. Bind it up as a |
| 959 | /// full-expression. |
| 960 | StmtResult Sema::ActOnForEachLValueExpr(Expr *E) { |
| 961 | CheckImplicitConversions(E); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 962 | ExprResult Result = MaybeCreateExprWithCleanups(E); |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 963 | if (Result.isInvalid()) return StmtError(); |
| 964 | return Owned(static_cast<Stmt*>(Result.get())); |
| 965 | } |
| 966 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 967 | StmtResult |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 968 | Sema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, |
| 969 | SourceLocation LParenLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 970 | Stmt *First, Expr *Second, |
| 971 | SourceLocation RParenLoc, Stmt *Body) { |
Fariborz Jahanian | 20552d2 | 2008-01-10 20:33:58 +0000 | [diff] [blame] | 972 | if (First) { |
| 973 | QualType FirstType; |
| 974 | if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { |
Chris Lattner | 7e24e82 | 2009-03-28 06:33:19 +0000 | [diff] [blame] | 975 | if (!DS->isSingleDecl()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 976 | return StmtError(Diag((*DS->decl_begin())->getLocation(), |
| 977 | diag::err_toomany_element_decls)); |
| 978 | |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 979 | VarDecl *D = cast<VarDecl>(DS->getSingleDecl()); |
| 980 | FirstType = D->getType(); |
Chris Lattner | f3a41af | 2008-11-20 06:38:18 +0000 | [diff] [blame] | 981 | // C99 6.8.5p3: The declaration part of a 'for' statement shall only |
| 982 | // declare identifiers for objects having storage class 'auto' or |
| 983 | // 'register'. |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 984 | if (!D->hasLocalStorage()) |
| 985 | return StmtError(Diag(D->getLocation(), |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 986 | diag::err_non_variable_decl_in_for)); |
Anders Carlsson | 1fe379f | 2008-08-25 18:16:36 +0000 | [diff] [blame] | 987 | } else { |
Douglas Gregor | c3203e7 | 2010-04-22 23:10:45 +0000 | [diff] [blame] | 988 | Expr *FirstE = cast<Expr>(First); |
John McCall | 7eb0a9e | 2010-11-24 05:12:34 +0000 | [diff] [blame] | 989 | if (!FirstE->isTypeDependent() && !FirstE->isLValue()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 990 | return StmtError(Diag(First->getLocStart(), |
| 991 | diag::err_selector_element_not_lvalue) |
| 992 | << First->getSourceRange()); |
| 993 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 994 | FirstType = static_cast<Expr*>(First)->getType(); |
Anders Carlsson | 1fe379f | 2008-08-25 18:16:36 +0000 | [diff] [blame] | 995 | } |
Douglas Gregor | c3203e7 | 2010-04-22 23:10:45 +0000 | [diff] [blame] | 996 | if (!FirstType->isDependentType() && |
| 997 | !FirstType->isObjCObjectPointerType() && |
Fariborz Jahanian | a5e42a8 | 2009-08-14 21:53:27 +0000 | [diff] [blame] | 998 | !FirstType->isBlockPointerType()) |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 999 | Diag(ForLoc, diag::err_selector_element_type) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 1000 | << FirstType << First->getSourceRange(); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1001 | } |
Douglas Gregor | c3203e7 | 2010-04-22 23:10:45 +0000 | [diff] [blame] | 1002 | if (Second && !Second->isTypeDependent()) { |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 1003 | ExprResult Result = DefaultFunctionArrayLvalueConversion(Second); |
| 1004 | if (Result.isInvalid()) |
| 1005 | return StmtError(); |
| 1006 | Second = Result.take(); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1007 | QualType SecondType = Second->getType(); |
Steve Naroff | f495456 | 2009-07-16 15:41:00 +0000 | [diff] [blame] | 1008 | if (!SecondType->isObjCObjectPointerType()) |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 1009 | Diag(ForLoc, diag::err_collection_expr_type) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 1010 | << SecondType << Second->getSourceRange(); |
Fariborz Jahanian | ea16110 | 2010-08-12 22:25:42 +0000 | [diff] [blame] | 1011 | else if (const ObjCObjectPointerType *OPT = |
| 1012 | SecondType->getAsObjCInterfacePointerType()) { |
| 1013 | llvm::SmallVector<IdentifierInfo *, 4> KeyIdents; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1014 | IdentifierInfo* selIdent = |
Fariborz Jahanian | ea16110 | 2010-08-12 22:25:42 +0000 | [diff] [blame] | 1015 | &Context.Idents.get("countByEnumeratingWithState"); |
| 1016 | KeyIdents.push_back(selIdent); |
| 1017 | selIdent = &Context.Idents.get("objects"); |
| 1018 | KeyIdents.push_back(selIdent); |
| 1019 | selIdent = &Context.Idents.get("count"); |
| 1020 | KeyIdents.push_back(selIdent); |
| 1021 | Selector CSelector = Context.Selectors.getSelector(3, &KeyIdents[0]); |
| 1022 | if (ObjCInterfaceDecl *IDecl = OPT->getInterfaceDecl()) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1023 | if (!IDecl->isForwardDecl() && |
Fariborz Jahanian | 6147806 | 2011-03-09 20:18:06 +0000 | [diff] [blame] | 1024 | !IDecl->lookupInstanceMethod(CSelector) && |
| 1025 | !LookupMethodInQualifiedType(CSelector, OPT, true)) { |
Fariborz Jahanian | 80a785c | 2010-08-12 22:33:42 +0000 | [diff] [blame] | 1026 | // Must further look into private implementation methods. |
Fariborz Jahanian | ea16110 | 2010-08-12 22:25:42 +0000 | [diff] [blame] | 1027 | if (!LookupPrivateInstanceMethod(CSelector, IDecl)) |
| 1028 | Diag(ForLoc, diag::warn_collection_expr_type) |
| 1029 | << SecondType << CSelector << Second->getSourceRange(); |
| 1030 | } |
| 1031 | } |
| 1032 | } |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1033 | } |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1034 | return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, |
| 1035 | ForLoc, RParenLoc)); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1036 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1037 | |
Richard Smith | ad762fc | 2011-04-14 22:09:26 +0000 | [diff] [blame] | 1038 | namespace { |
| 1039 | |
| 1040 | enum BeginEndFunction { |
| 1041 | BEF_begin, |
| 1042 | BEF_end |
| 1043 | }; |
| 1044 | |
| 1045 | /// Build a variable declaration for a for-range statement. |
| 1046 | static VarDecl *BuildForRangeVarDecl(Sema &SemaRef, SourceLocation Loc, |
| 1047 | QualType Type, const char *Name) { |
| 1048 | DeclContext *DC = SemaRef.CurContext; |
| 1049 | IdentifierInfo *II = &SemaRef.PP.getIdentifierTable().get(Name); |
| 1050 | TypeSourceInfo *TInfo = SemaRef.Context.getTrivialTypeSourceInfo(Type, Loc); |
| 1051 | VarDecl *Decl = VarDecl::Create(SemaRef.Context, DC, Loc, Loc, II, Type, |
| 1052 | TInfo, SC_Auto, SC_None); |
Richard Smith | b403d6d | 2011-04-18 15:49:25 +0000 | [diff] [blame] | 1053 | Decl->setImplicit(); |
Richard Smith | ad762fc | 2011-04-14 22:09:26 +0000 | [diff] [blame] | 1054 | return Decl; |
| 1055 | } |
| 1056 | |
| 1057 | /// Finish building a variable declaration for a for-range statement. |
| 1058 | /// \return true if an error occurs. |
| 1059 | static bool FinishForRangeVarDecl(Sema &SemaRef, VarDecl *Decl, Expr *Init, |
| 1060 | SourceLocation Loc, int diag) { |
| 1061 | // Deduce the type for the iterator variable now rather than leaving it to |
| 1062 | // AddInitializerToDecl, so we can produce a more suitable diagnostic. |
| 1063 | TypeSourceInfo *InitTSI = 0; |
| 1064 | if (Init->getType()->isVoidType() || |
| 1065 | !SemaRef.DeduceAutoType(Decl->getTypeSourceInfo(), Init, InitTSI)) |
| 1066 | SemaRef.Diag(Loc, diag) << Init->getType(); |
| 1067 | if (!InitTSI) { |
| 1068 | Decl->setInvalidDecl(); |
| 1069 | return true; |
| 1070 | } |
| 1071 | Decl->setTypeSourceInfo(InitTSI); |
| 1072 | Decl->setType(InitTSI->getType()); |
| 1073 | |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1074 | // In ARC, infer lifetime. |
| 1075 | // FIXME: ARC may want to turn this into 'const __unsafe_unretained' if |
| 1076 | // we're doing the equivalent of fast iteration. |
| 1077 | if (SemaRef.getLangOptions().ObjCAutoRefCount && |
| 1078 | SemaRef.inferObjCARCLifetime(Decl)) |
| 1079 | Decl->setInvalidDecl(); |
| 1080 | |
Richard Smith | ad762fc | 2011-04-14 22:09:26 +0000 | [diff] [blame] | 1081 | SemaRef.AddInitializerToDecl(Decl, Init, /*DirectInit=*/false, |
| 1082 | /*TypeMayContainAuto=*/false); |
| 1083 | SemaRef.FinalizeDeclaration(Decl); |
Richard Smith | b403d6d | 2011-04-18 15:49:25 +0000 | [diff] [blame] | 1084 | SemaRef.CurContext->addHiddenDecl(Decl); |
Richard Smith | ad762fc | 2011-04-14 22:09:26 +0000 | [diff] [blame] | 1085 | return false; |
| 1086 | } |
| 1087 | |
| 1088 | /// Produce a note indicating which begin/end function was implicitly called |
| 1089 | /// by a C++0x for-range statement. This is often not obvious from the code, |
| 1090 | /// nor from the diagnostics produced when analysing the implicit expressions |
| 1091 | /// required in a for-range statement. |
| 1092 | void NoteForRangeBeginEndFunction(Sema &SemaRef, Expr *E, |
| 1093 | BeginEndFunction BEF) { |
| 1094 | CallExpr *CE = dyn_cast<CallExpr>(E); |
| 1095 | if (!CE) |
| 1096 | return; |
| 1097 | FunctionDecl *D = dyn_cast<FunctionDecl>(CE->getCalleeDecl()); |
| 1098 | if (!D) |
| 1099 | return; |
| 1100 | SourceLocation Loc = D->getLocation(); |
| 1101 | |
| 1102 | std::string Description; |
| 1103 | bool IsTemplate = false; |
| 1104 | if (FunctionTemplateDecl *FunTmpl = D->getPrimaryTemplate()) { |
| 1105 | Description = SemaRef.getTemplateArgumentBindingsText( |
| 1106 | FunTmpl->getTemplateParameters(), *D->getTemplateSpecializationArgs()); |
| 1107 | IsTemplate = true; |
| 1108 | } |
| 1109 | |
| 1110 | SemaRef.Diag(Loc, diag::note_for_range_begin_end) |
| 1111 | << BEF << IsTemplate << Description << E->getType(); |
| 1112 | } |
| 1113 | |
| 1114 | /// Build a call to 'begin' or 'end' for a C++0x for-range statement. If the |
| 1115 | /// given LookupResult is non-empty, it is assumed to describe a member which |
| 1116 | /// will be invoked. Otherwise, the function will be found via argument |
| 1117 | /// dependent lookup. |
| 1118 | static ExprResult BuildForRangeBeginEndCall(Sema &SemaRef, Scope *S, |
| 1119 | SourceLocation Loc, |
| 1120 | VarDecl *Decl, |
| 1121 | BeginEndFunction BEF, |
| 1122 | const DeclarationNameInfo &NameInfo, |
| 1123 | LookupResult &MemberLookup, |
| 1124 | Expr *Range) { |
| 1125 | ExprResult CallExpr; |
| 1126 | if (!MemberLookup.empty()) { |
| 1127 | ExprResult MemberRef = |
| 1128 | SemaRef.BuildMemberReferenceExpr(Range, Range->getType(), Loc, |
| 1129 | /*IsPtr=*/false, CXXScopeSpec(), |
| 1130 | /*Qualifier=*/0, MemberLookup, |
| 1131 | /*TemplateArgs=*/0); |
| 1132 | if (MemberRef.isInvalid()) |
| 1133 | return ExprError(); |
| 1134 | CallExpr = SemaRef.ActOnCallExpr(S, MemberRef.get(), Loc, MultiExprArg(), |
| 1135 | Loc, 0); |
| 1136 | if (CallExpr.isInvalid()) |
| 1137 | return ExprError(); |
| 1138 | } else { |
| 1139 | UnresolvedSet<0> FoundNames; |
| 1140 | // C++0x [stmt.ranged]p1: For the purposes of this name lookup, namespace |
| 1141 | // std is an associated namespace. |
| 1142 | UnresolvedLookupExpr *Fn = |
| 1143 | UnresolvedLookupExpr::Create(SemaRef.Context, /*NamingClass=*/0, |
| 1144 | NestedNameSpecifierLoc(), NameInfo, |
| 1145 | /*NeedsADL=*/true, /*Overloaded=*/false, |
| 1146 | FoundNames.begin(), FoundNames.end(), |
| 1147 | /*LookInStdNamespace=*/true); |
| 1148 | CallExpr = SemaRef.BuildOverloadedCallExpr(S, Fn, Fn, Loc, &Range, 1, Loc, |
| 1149 | 0); |
| 1150 | if (CallExpr.isInvalid()) { |
| 1151 | SemaRef.Diag(Range->getLocStart(), diag::note_for_range_type) |
| 1152 | << Range->getType(); |
| 1153 | return ExprError(); |
| 1154 | } |
| 1155 | } |
| 1156 | if (FinishForRangeVarDecl(SemaRef, Decl, CallExpr.get(), Loc, |
| 1157 | diag::err_for_range_iter_deduction_failure)) { |
| 1158 | NoteForRangeBeginEndFunction(SemaRef, CallExpr.get(), BEF); |
| 1159 | return ExprError(); |
| 1160 | } |
| 1161 | return CallExpr; |
| 1162 | } |
| 1163 | |
| 1164 | } |
| 1165 | |
| 1166 | /// ActOnCXXForRangeStmt - Check and build a C++0x for-range statement. |
| 1167 | /// |
| 1168 | /// C++0x [stmt.ranged]: |
| 1169 | /// A range-based for statement is equivalent to |
| 1170 | /// |
| 1171 | /// { |
| 1172 | /// auto && __range = range-init; |
| 1173 | /// for ( auto __begin = begin-expr, |
| 1174 | /// __end = end-expr; |
| 1175 | /// __begin != __end; |
| 1176 | /// ++__begin ) { |
| 1177 | /// for-range-declaration = *__begin; |
| 1178 | /// statement |
| 1179 | /// } |
| 1180 | /// } |
| 1181 | /// |
| 1182 | /// The body of the loop is not available yet, since it cannot be analysed until |
| 1183 | /// we have determined the type of the for-range-declaration. |
| 1184 | StmtResult |
| 1185 | Sema::ActOnCXXForRangeStmt(SourceLocation ForLoc, SourceLocation LParenLoc, |
| 1186 | Stmt *First, SourceLocation ColonLoc, Expr *Range, |
| 1187 | SourceLocation RParenLoc) { |
| 1188 | if (!First || !Range) |
| 1189 | return StmtError(); |
| 1190 | |
| 1191 | DeclStmt *DS = dyn_cast<DeclStmt>(First); |
| 1192 | assert(DS && "first part of for range not a decl stmt"); |
| 1193 | |
| 1194 | if (!DS->isSingleDecl()) { |
| 1195 | Diag(DS->getStartLoc(), diag::err_type_defined_in_for_range); |
| 1196 | return StmtError(); |
| 1197 | } |
| 1198 | if (DS->getSingleDecl()->isInvalidDecl()) |
| 1199 | return StmtError(); |
| 1200 | |
| 1201 | if (DiagnoseUnexpandedParameterPack(Range, UPPC_Expression)) |
| 1202 | return StmtError(); |
| 1203 | |
| 1204 | // Build auto && __range = range-init |
| 1205 | SourceLocation RangeLoc = Range->getLocStart(); |
| 1206 | VarDecl *RangeVar = BuildForRangeVarDecl(*this, RangeLoc, |
| 1207 | Context.getAutoRRefDeductType(), |
| 1208 | "__range"); |
| 1209 | if (FinishForRangeVarDecl(*this, RangeVar, Range, RangeLoc, |
| 1210 | diag::err_for_range_deduction_failure)) |
| 1211 | return StmtError(); |
| 1212 | |
| 1213 | // Claim the type doesn't contain auto: we've already done the checking. |
| 1214 | DeclGroupPtrTy RangeGroup = |
| 1215 | BuildDeclaratorGroup((Decl**)&RangeVar, 1, /*TypeMayContainAuto=*/false); |
| 1216 | StmtResult RangeDecl = ActOnDeclStmt(RangeGroup, RangeLoc, RangeLoc); |
| 1217 | if (RangeDecl.isInvalid()) |
| 1218 | return StmtError(); |
| 1219 | |
| 1220 | return BuildCXXForRangeStmt(ForLoc, ColonLoc, RangeDecl.get(), |
| 1221 | /*BeginEndDecl=*/0, /*Cond=*/0, /*Inc=*/0, DS, |
| 1222 | RParenLoc); |
| 1223 | } |
| 1224 | |
| 1225 | /// BuildCXXForRangeStmt - Build or instantiate a C++0x for-range statement. |
| 1226 | StmtResult |
| 1227 | Sema::BuildCXXForRangeStmt(SourceLocation ForLoc, SourceLocation ColonLoc, |
| 1228 | Stmt *RangeDecl, Stmt *BeginEnd, Expr *Cond, |
| 1229 | Expr *Inc, Stmt *LoopVarDecl, |
| 1230 | SourceLocation RParenLoc) { |
| 1231 | Scope *S = getCurScope(); |
| 1232 | |
| 1233 | DeclStmt *RangeDS = cast<DeclStmt>(RangeDecl); |
| 1234 | VarDecl *RangeVar = cast<VarDecl>(RangeDS->getSingleDecl()); |
| 1235 | QualType RangeVarType = RangeVar->getType(); |
| 1236 | |
| 1237 | DeclStmt *LoopVarDS = cast<DeclStmt>(LoopVarDecl); |
| 1238 | VarDecl *LoopVar = cast<VarDecl>(LoopVarDS->getSingleDecl()); |
| 1239 | |
| 1240 | StmtResult BeginEndDecl = BeginEnd; |
| 1241 | ExprResult NotEqExpr = Cond, IncrExpr = Inc; |
| 1242 | |
| 1243 | if (!BeginEndDecl.get() && !RangeVarType->isDependentType()) { |
| 1244 | SourceLocation RangeLoc = RangeVar->getLocation(); |
| 1245 | |
| 1246 | ExprResult RangeRef = BuildDeclRefExpr(RangeVar, |
| 1247 | RangeVarType.getNonReferenceType(), |
| 1248 | VK_LValue, ColonLoc); |
| 1249 | if (RangeRef.isInvalid()) |
| 1250 | return StmtError(); |
| 1251 | |
| 1252 | QualType AutoType = Context.getAutoDeductType(); |
| 1253 | Expr *Range = RangeVar->getInit(); |
| 1254 | if (!Range) |
| 1255 | return StmtError(); |
| 1256 | QualType RangeType = Range->getType(); |
| 1257 | |
| 1258 | if (RequireCompleteType(RangeLoc, RangeType, |
| 1259 | PDiag(diag::err_for_range_incomplete_type))) |
| 1260 | return StmtError(); |
| 1261 | |
| 1262 | // Build auto __begin = begin-expr, __end = end-expr. |
| 1263 | VarDecl *BeginVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, |
| 1264 | "__begin"); |
| 1265 | VarDecl *EndVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, |
| 1266 | "__end"); |
| 1267 | |
| 1268 | // Build begin-expr and end-expr and attach to __begin and __end variables. |
| 1269 | ExprResult BeginExpr, EndExpr; |
| 1270 | if (const ArrayType *UnqAT = RangeType->getAsArrayTypeUnsafe()) { |
| 1271 | // - if _RangeT is an array type, begin-expr and end-expr are __range and |
| 1272 | // __range + __bound, respectively, where __bound is the array bound. If |
| 1273 | // _RangeT is an array of unknown size or an array of incomplete type, |
| 1274 | // the program is ill-formed; |
| 1275 | |
| 1276 | // begin-expr is __range. |
| 1277 | BeginExpr = RangeRef; |
| 1278 | if (FinishForRangeVarDecl(*this, BeginVar, RangeRef.get(), ColonLoc, |
| 1279 | diag::err_for_range_iter_deduction_failure)) { |
| 1280 | NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); |
| 1281 | return StmtError(); |
| 1282 | } |
| 1283 | |
| 1284 | // Find the array bound. |
| 1285 | ExprResult BoundExpr; |
| 1286 | if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(UnqAT)) |
| 1287 | BoundExpr = Owned(IntegerLiteral::Create(Context, CAT->getSize(), |
Richard Trieu | 1dd986d | 2011-05-02 23:00:27 +0000 | [diff] [blame] | 1288 | Context.getPointerDiffType(), |
| 1289 | RangeLoc)); |
Richard Smith | ad762fc | 2011-04-14 22:09:26 +0000 | [diff] [blame] | 1290 | else if (const VariableArrayType *VAT = |
| 1291 | dyn_cast<VariableArrayType>(UnqAT)) |
| 1292 | BoundExpr = VAT->getSizeExpr(); |
| 1293 | else { |
| 1294 | // Can't be a DependentSizedArrayType or an IncompleteArrayType since |
| 1295 | // UnqAT is not incomplete and Range is not type-dependent. |
| 1296 | assert(0 && "Unexpected array type in for-range"); |
| 1297 | return StmtError(); |
| 1298 | } |
| 1299 | |
| 1300 | // end-expr is __range + __bound. |
| 1301 | EndExpr = ActOnBinOp(S, ColonLoc, tok::plus, RangeRef.get(), |
| 1302 | BoundExpr.get()); |
| 1303 | if (EndExpr.isInvalid()) |
| 1304 | return StmtError(); |
| 1305 | if (FinishForRangeVarDecl(*this, EndVar, EndExpr.get(), ColonLoc, |
| 1306 | diag::err_for_range_iter_deduction_failure)) { |
| 1307 | NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); |
| 1308 | return StmtError(); |
| 1309 | } |
| 1310 | } else { |
| 1311 | DeclarationNameInfo BeginNameInfo(&PP.getIdentifierTable().get("begin"), |
| 1312 | ColonLoc); |
| 1313 | DeclarationNameInfo EndNameInfo(&PP.getIdentifierTable().get("end"), |
| 1314 | ColonLoc); |
| 1315 | |
| 1316 | LookupResult BeginMemberLookup(*this, BeginNameInfo, LookupMemberName); |
| 1317 | LookupResult EndMemberLookup(*this, EndNameInfo, LookupMemberName); |
| 1318 | |
| 1319 | if (CXXRecordDecl *D = RangeType->getAsCXXRecordDecl()) { |
| 1320 | // - if _RangeT is a class type, the unqualified-ids begin and end are |
| 1321 | // looked up in the scope of class _RangeT as if by class member access |
| 1322 | // lookup (3.4.5), and if either (or both) finds at least one |
| 1323 | // declaration, begin-expr and end-expr are __range.begin() and |
| 1324 | // __range.end(), respectively; |
| 1325 | LookupQualifiedName(BeginMemberLookup, D); |
| 1326 | LookupQualifiedName(EndMemberLookup, D); |
| 1327 | |
| 1328 | if (BeginMemberLookup.empty() != EndMemberLookup.empty()) { |
| 1329 | Diag(ColonLoc, diag::err_for_range_member_begin_end_mismatch) |
| 1330 | << RangeType << BeginMemberLookup.empty(); |
| 1331 | return StmtError(); |
| 1332 | } |
| 1333 | } else { |
| 1334 | // - otherwise, begin-expr and end-expr are begin(__range) and |
| 1335 | // end(__range), respectively, where begin and end are looked up with |
| 1336 | // argument-dependent lookup (3.4.2). For the purposes of this name |
| 1337 | // lookup, namespace std is an associated namespace. |
| 1338 | } |
| 1339 | |
| 1340 | BeginExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, BeginVar, |
| 1341 | BEF_begin, BeginNameInfo, |
| 1342 | BeginMemberLookup, RangeRef.get()); |
| 1343 | if (BeginExpr.isInvalid()) |
| 1344 | return StmtError(); |
| 1345 | |
| 1346 | EndExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, EndVar, |
| 1347 | BEF_end, EndNameInfo, |
| 1348 | EndMemberLookup, RangeRef.get()); |
| 1349 | if (EndExpr.isInvalid()) |
| 1350 | return StmtError(); |
| 1351 | } |
| 1352 | |
| 1353 | // C++0x [decl.spec.auto]p6: BeginType and EndType must be the same. |
| 1354 | QualType BeginType = BeginVar->getType(), EndType = EndVar->getType(); |
| 1355 | if (!Context.hasSameType(BeginType, EndType)) { |
| 1356 | Diag(RangeLoc, diag::err_for_range_begin_end_types_differ) |
| 1357 | << BeginType << EndType; |
| 1358 | NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); |
| 1359 | NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); |
| 1360 | } |
| 1361 | |
| 1362 | Decl *BeginEndDecls[] = { BeginVar, EndVar }; |
| 1363 | // Claim the type doesn't contain auto: we've already done the checking. |
| 1364 | DeclGroupPtrTy BeginEndGroup = |
| 1365 | BuildDeclaratorGroup(BeginEndDecls, 2, /*TypeMayContainAuto=*/false); |
| 1366 | BeginEndDecl = ActOnDeclStmt(BeginEndGroup, ColonLoc, ColonLoc); |
| 1367 | |
| 1368 | ExprResult BeginRef = BuildDeclRefExpr(BeginVar, |
| 1369 | BeginType.getNonReferenceType(), |
| 1370 | VK_LValue, ColonLoc); |
| 1371 | ExprResult EndRef = BuildDeclRefExpr(EndVar, EndType.getNonReferenceType(), |
| 1372 | VK_LValue, ColonLoc); |
| 1373 | |
| 1374 | // Build and check __begin != __end expression. |
| 1375 | NotEqExpr = ActOnBinOp(S, ColonLoc, tok::exclaimequal, |
| 1376 | BeginRef.get(), EndRef.get()); |
| 1377 | NotEqExpr = ActOnBooleanCondition(S, ColonLoc, NotEqExpr.get()); |
| 1378 | NotEqExpr = ActOnFinishFullExpr(NotEqExpr.get()); |
| 1379 | if (NotEqExpr.isInvalid()) { |
| 1380 | NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); |
| 1381 | if (!Context.hasSameType(BeginType, EndType)) |
| 1382 | NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); |
| 1383 | return StmtError(); |
| 1384 | } |
| 1385 | |
| 1386 | // Build and check ++__begin expression. |
| 1387 | IncrExpr = ActOnUnaryOp(S, ColonLoc, tok::plusplus, BeginRef.get()); |
| 1388 | IncrExpr = ActOnFinishFullExpr(IncrExpr.get()); |
| 1389 | if (IncrExpr.isInvalid()) { |
| 1390 | NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); |
| 1391 | return StmtError(); |
| 1392 | } |
| 1393 | |
| 1394 | // Build and check *__begin expression. |
| 1395 | ExprResult DerefExpr = ActOnUnaryOp(S, ColonLoc, tok::star, BeginRef.get()); |
| 1396 | if (DerefExpr.isInvalid()) { |
| 1397 | NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); |
| 1398 | return StmtError(); |
| 1399 | } |
| 1400 | |
| 1401 | // Attach *__begin as initializer for VD. |
| 1402 | if (!LoopVar->isInvalidDecl()) { |
| 1403 | AddInitializerToDecl(LoopVar, DerefExpr.get(), /*DirectInit=*/false, |
| 1404 | /*TypeMayContainAuto=*/true); |
| 1405 | if (LoopVar->isInvalidDecl()) |
| 1406 | NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); |
| 1407 | } |
| 1408 | } |
| 1409 | |
| 1410 | return Owned(new (Context) CXXForRangeStmt(RangeDS, |
| 1411 | cast_or_null<DeclStmt>(BeginEndDecl.get()), |
| 1412 | NotEqExpr.take(), IncrExpr.take(), |
| 1413 | LoopVarDS, /*Body=*/0, ForLoc, |
| 1414 | ColonLoc, RParenLoc)); |
| 1415 | } |
| 1416 | |
| 1417 | /// FinishCXXForRangeStmt - Attach the body to a C++0x for-range statement. |
| 1418 | /// This is a separate step from ActOnCXXForRangeStmt because analysis of the |
| 1419 | /// body cannot be performed until after the type of the range variable is |
| 1420 | /// determined. |
| 1421 | StmtResult Sema::FinishCXXForRangeStmt(Stmt *S, Stmt *B) { |
| 1422 | if (!S || !B) |
| 1423 | return StmtError(); |
| 1424 | |
| 1425 | cast<CXXForRangeStmt>(S)->setBody(B); |
| 1426 | return S; |
| 1427 | } |
| 1428 | |
Chris Lattner | 57ad378 | 2011-02-17 20:34:02 +0000 | [diff] [blame] | 1429 | StmtResult Sema::ActOnGotoStmt(SourceLocation GotoLoc, |
| 1430 | SourceLocation LabelLoc, |
| 1431 | LabelDecl *TheDecl) { |
| 1432 | getCurFunction()->setHasBranchIntoScope(); |
Chris Lattner | ad8dcf4 | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 1433 | TheDecl->setUsed(); |
| 1434 | return Owned(new (Context) GotoStmt(TheDecl, GotoLoc, LabelLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1435 | } |
| 1436 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1437 | StmtResult |
Chris Lattner | ad56d68 | 2009-04-19 01:04:21 +0000 | [diff] [blame] | 1438 | Sema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1439 | Expr *E) { |
Eli Friedman | bbf4623 | 2009-03-26 00:18:06 +0000 | [diff] [blame] | 1440 | // Convert operand to void* |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1441 | if (!E->isTypeDependent()) { |
| 1442 | QualType ETy = E->getType(); |
Chandler Carruth | 2877998 | 2010-01-31 10:26:25 +0000 | [diff] [blame] | 1443 | QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 1444 | ExprResult ExprRes = Owned(E); |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1445 | AssignConvertType ConvTy = |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 1446 | CheckSingleAssignmentConstraints(DestTy, ExprRes); |
| 1447 | if (ExprRes.isInvalid()) |
| 1448 | return StmtError(); |
| 1449 | E = ExprRes.take(); |
Chandler Carruth | 2877998 | 2010-01-31 10:26:25 +0000 | [diff] [blame] | 1450 | if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1451 | return StmtError(); |
| 1452 | } |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 1453 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1454 | getCurFunction()->setHasIndirectGoto(); |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 1455 | |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1456 | return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1457 | } |
| 1458 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1459 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 1460 | Sema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1461 | Scope *S = CurScope->getContinueParent(); |
| 1462 | if (!S) { |
| 1463 | // C99 6.8.6.2p1: A break shall appear only in or as a loop body. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1464 | return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1465 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1466 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1467 | return Owned(new (Context) ContinueStmt(ContinueLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1468 | } |
| 1469 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1470 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 1471 | Sema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1472 | Scope *S = CurScope->getBreakParent(); |
| 1473 | if (!S) { |
| 1474 | // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1475 | return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1476 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1477 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1478 | return Owned(new (Context) BreakStmt(BreakLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1479 | } |
| 1480 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1481 | /// \brief Determine whether the given expression is a candidate for |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1482 | /// copy elision in either a return statement or a throw expression. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1483 | /// |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1484 | /// \param ReturnType If we're determining the copy elision candidate for |
| 1485 | /// a return statement, this is the return type of the function. If we're |
| 1486 | /// determining the copy elision candidate for a throw expression, this will |
| 1487 | /// be a NULL type. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1488 | /// |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1489 | /// \param E The expression being returned from the function or block, or |
| 1490 | /// being thrown. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1491 | /// |
Douglas Gregor | 4926d83 | 2011-05-20 15:00:53 +0000 | [diff] [blame] | 1492 | /// \param AllowFunctionParameter Whether we allow function parameters to |
| 1493 | /// be considered NRVO candidates. C++ prohibits this for NRVO itself, but |
| 1494 | /// we re-use this logic to determine whether we should try to move as part of |
| 1495 | /// a return or throw (which does allow function parameters). |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1496 | /// |
| 1497 | /// \returns The NRVO candidate variable, if the return statement may use the |
| 1498 | /// NRVO, or NULL if there is no such candidate. |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1499 | const VarDecl *Sema::getCopyElisionCandidate(QualType ReturnType, |
| 1500 | Expr *E, |
| 1501 | bool AllowFunctionParameter) { |
| 1502 | QualType ExprType = E->getType(); |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1503 | // - in a return statement in a function with ... |
| 1504 | // ... a class return type ... |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1505 | if (!ReturnType.isNull()) { |
| 1506 | if (!ReturnType->isRecordType()) |
| 1507 | return 0; |
| 1508 | // ... the same cv-unqualified type as the function return type ... |
| 1509 | if (!Context.hasSameUnqualifiedType(ReturnType, ExprType)) |
| 1510 | return 0; |
| 1511 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1512 | |
| 1513 | // ... the expression is the name of a non-volatile automatic object |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1514 | // (other than a function or catch-clause parameter)) ... |
| 1515 | const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E->IgnoreParens()); |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1516 | if (!DR) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1517 | return 0; |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1518 | const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); |
| 1519 | if (!VD) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1520 | return 0; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1521 | |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1522 | if (VD->hasLocalStorage() && !VD->isExceptionVariable() && |
Douglas Gregor | d86c477 | 2010-05-15 06:46:45 +0000 | [diff] [blame] | 1523 | !VD->getType()->isReferenceType() && !VD->hasAttr<BlocksAttr>() && |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1524 | !VD->getType().isVolatileQualified() && |
Douglas Gregor | 4a46c77 | 2011-01-21 18:20:49 +0000 | [diff] [blame] | 1525 | ((VD->getKind() == Decl::Var) || |
| 1526 | (AllowFunctionParameter && VD->getKind() == Decl::ParmVar))) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1527 | return VD; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1528 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1529 | return 0; |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1530 | } |
| 1531 | |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1532 | /// \brief Perform the initialization of a potentially-movable value, which |
| 1533 | /// is the result of return value. |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1534 | /// |
| 1535 | /// This routine implements C++0x [class.copy]p33, which attempts to treat |
| 1536 | /// returned lvalues as rvalues in certain cases (to prefer move construction), |
| 1537 | /// then falls back to treating them as lvalues if that failed. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1538 | ExprResult |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1539 | Sema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity, |
| 1540 | const VarDecl *NRVOCandidate, |
| 1541 | QualType ResultType, |
| 1542 | Expr *Value) { |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1543 | // C++0x [class.copy]p33: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1544 | // When the criteria for elision of a copy operation are met or would |
| 1545 | // be met save for the fact that the source object is a function |
| 1546 | // parameter, and the object to be copied is designated by an lvalue, |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1547 | // overload resolution to select the constructor for the copy is first |
| 1548 | // performed as if the object were designated by an rvalue. |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1549 | ExprResult Res = ExprError(); |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1550 | if (NRVOCandidate || getCopyElisionCandidate(ResultType, Value, true)) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1551 | ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1552 | Value->getType(), CK_LValueToRValue, |
| 1553 | Value, VK_XValue); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1554 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1555 | Expr *InitExpr = &AsRvalue; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1556 | InitializationKind Kind |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1557 | = InitializationKind::CreateCopy(Value->getLocStart(), |
| 1558 | Value->getLocStart()); |
| 1559 | InitializationSequence Seq(*this, Entity, Kind, &InitExpr, 1); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1560 | |
| 1561 | // [...] If overload resolution fails, or if the type of the first |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1562 | // parameter of the selected constructor is not an rvalue reference |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 1563 | // to the object's type (possibly cv-qualified), overload resolution |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1564 | // is performed again, considering the object as an lvalue. |
Sebastian Redl | 383616c | 2011-06-05 12:23:28 +0000 | [diff] [blame] | 1565 | if (Seq) { |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1566 | for (InitializationSequence::step_iterator Step = Seq.step_begin(), |
| 1567 | StepEnd = Seq.step_end(); |
| 1568 | Step != StepEnd; ++Step) { |
Sebastian Redl | 383616c | 2011-06-05 12:23:28 +0000 | [diff] [blame] | 1569 | if (Step->Kind != InitializationSequence::SK_ConstructorInitialization) |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1570 | continue; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1571 | |
| 1572 | CXXConstructorDecl *Constructor |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1573 | = cast<CXXConstructorDecl>(Step->Function.Function); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1574 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1575 | const RValueReferenceType *RRefType |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1576 | = Constructor->getParamDecl(0)->getType() |
| 1577 | ->getAs<RValueReferenceType>(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1578 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1579 | // If we don't meet the criteria, break out now. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1580 | if (!RRefType || |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1581 | !Context.hasSameUnqualifiedType(RRefType->getPointeeType(), |
| 1582 | Context.getTypeDeclType(Constructor->getParent()))) |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1583 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1584 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1585 | // Promote "AsRvalue" to the heap, since we now need this |
| 1586 | // expression node to persist. |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1587 | Value = ImplicitCastExpr::Create(Context, Value->getType(), |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1588 | CK_LValueToRValue, Value, 0, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1589 | VK_XValue); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1590 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1591 | // Complete type-checking the initialization of the return type |
| 1592 | // using the constructor we found. |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1593 | Res = Seq.Perform(*this, Entity, Kind, MultiExprArg(&Value, 1)); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1594 | } |
| 1595 | } |
| 1596 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1597 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1598 | // Either we didn't meet the criteria for treating an lvalue as an rvalue, |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1599 | // above, or overload resolution failed. Either way, we need to try |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1600 | // (again) now with the return value expression as written. |
| 1601 | if (Res.isInvalid()) |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1602 | Res = PerformCopyInitialization(Entity, SourceLocation(), Value); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1603 | |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1604 | return Res; |
| 1605 | } |
| 1606 | |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1607 | /// ActOnBlockReturnStmt - Utility routine to figure out block's return type. |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1608 | /// |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1609 | StmtResult |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1610 | Sema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1611 | // If this is the first return we've seen in the block, infer the type of |
| 1612 | // the block from it. |
Douglas Gregor | 9ea9bdb | 2010-03-01 23:15:13 +0000 | [diff] [blame] | 1613 | BlockScopeInfo *CurBlock = getCurBlock(); |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1614 | if (CurBlock->ReturnType.isNull()) { |
Steve Naroff | c50a4a5 | 2008-09-16 22:25:10 +0000 | [diff] [blame] | 1615 | if (RetValExp) { |
Steve Naroff | 1656442 | 2008-09-24 22:26:48 +0000 | [diff] [blame] | 1616 | // Don't call UsualUnaryConversions(), since we don't want to do |
| 1617 | // integer promotions here. |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 1618 | ExprResult Result = DefaultFunctionArrayLvalueConversion(RetValExp); |
| 1619 | if (Result.isInvalid()) |
| 1620 | return StmtError(); |
| 1621 | RetValExp = Result.take(); |
Douglas Gregor | 6a576ab | 2011-06-05 05:04:23 +0000 | [diff] [blame] | 1622 | |
| 1623 | if (!RetValExp->isTypeDependent()) { |
| 1624 | CurBlock->ReturnType = RetValExp->getType(); |
| 1625 | if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { |
| 1626 | // We have to remove a 'const' added to copied-in variable which was |
| 1627 | // part of the implementation spec. and not the actual qualifier for |
| 1628 | // the variable. |
| 1629 | if (CDRE->isConstQualAdded()) |
| 1630 | CurBlock->ReturnType.removeLocalConst(); // FIXME: local??? |
| 1631 | } |
| 1632 | } else |
| 1633 | CurBlock->ReturnType = Context.DependentTy; |
Steve Naroff | c50a4a5 | 2008-09-16 22:25:10 +0000 | [diff] [blame] | 1634 | } else |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1635 | CurBlock->ReturnType = Context.VoidTy; |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1636 | } |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1637 | QualType FnRetType = CurBlock->ReturnType; |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1638 | |
John McCall | 711c52b | 2011-01-05 12:14:39 +0000 | [diff] [blame] | 1639 | if (CurBlock->FunctionType->getAs<FunctionType>()->getNoReturnAttr()) { |
Mike Stump | 6c92fa7 | 2009-04-29 21:40:37 +0000 | [diff] [blame] | 1640 | Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) |
| 1641 | << getCurFunctionOrMethodDecl()->getDeclName(); |
| 1642 | return StmtError(); |
| 1643 | } |
| 1644 | |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1645 | // Otherwise, verify that this result type matches the previous one. We are |
| 1646 | // pickier with blocks than for normal functions because we don't have GCC |
| 1647 | // compatibility to worry about here. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1648 | ReturnStmt *Result = 0; |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1649 | if (CurBlock->ReturnType->isVoidType()) { |
Douglas Gregor | bc3e64f | 2011-06-05 05:14:41 +0000 | [diff] [blame] | 1650 | if (RetValExp && !RetValExp->isTypeDependent() && |
| 1651 | (!getLangOptions().CPlusPlus || !RetValExp->getType()->isVoidType())) { |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1652 | Diag(ReturnLoc, diag::err_return_block_has_expr); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1653 | RetValExp = 0; |
| 1654 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1655 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); |
| 1656 | } else if (!RetValExp) { |
Douglas Gregor | bc3e64f | 2011-06-05 05:14:41 +0000 | [diff] [blame] | 1657 | if (!CurBlock->ReturnType->isDependentType()) |
| 1658 | return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); |
| 1659 | |
| 1660 | Result = new (Context) ReturnStmt(ReturnLoc, 0, 0); |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1661 | } else { |
| 1662 | const VarDecl *NRVOCandidate = 0; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1663 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1664 | if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { |
| 1665 | // we have a non-void block with an expression, continue checking |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1666 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1667 | // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| 1668 | // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
| 1669 | // function return. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1670 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1671 | // In C++ the return statement is handled via a copy initialization. |
| 1672 | // the C version of which boils down to CheckSingleAssignmentConstraints. |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1673 | NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1674 | InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1675 | FnRetType, |
| 1676 | NRVOCandidate != 0); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1677 | ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1678 | FnRetType, RetValExp); |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1679 | if (Res.isInvalid()) { |
| 1680 | // FIXME: Cleanup temporaries here, anyway? |
| 1681 | return StmtError(); |
| 1682 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1683 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1684 | if (RetValExp) { |
| 1685 | CheckImplicitConversions(RetValExp, ReturnLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1686 | RetValExp = MaybeCreateExprWithCleanups(RetValExp); |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1687 | } |
Mike Stump | 98eb8a7 | 2009-02-04 22:31:32 +0000 | [diff] [blame] | 1688 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1689 | RetValExp = Res.takeAs<Expr>(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1690 | if (RetValExp) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1691 | CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
Anders Carlsson | c6acbc5 | 2010-01-29 18:30:20 +0000 | [diff] [blame] | 1692 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1693 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1694 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1695 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1696 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1697 | // If we need to check for the named return value optimization, save the |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1698 | // return statement in our scope for later processing. |
Douglas Gregor | 6a576ab | 2011-06-05 05:04:23 +0000 | [diff] [blame] | 1699 | if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1700 | !CurContext->isDependentContext()) |
| 1701 | FunctionScopes.back()->Returns.push_back(Result); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1702 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1703 | return Owned(Result); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1704 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1705 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1706 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1707 | Sema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { |
Douglas Gregor | fc92137 | 2011-05-20 15:32:55 +0000 | [diff] [blame] | 1708 | // Check for unexpanded parameter packs. |
| 1709 | if (RetValExp && DiagnoseUnexpandedParameterPack(RetValExp)) |
| 1710 | return StmtError(); |
| 1711 | |
Douglas Gregor | 9ea9bdb | 2010-03-01 23:15:13 +0000 | [diff] [blame] | 1712 | if (getCurBlock()) |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1713 | return ActOnBlockReturnStmt(ReturnLoc, RetValExp); |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1714 | |
Chris Lattner | 371f258 | 2008-12-04 23:50:19 +0000 | [diff] [blame] | 1715 | QualType FnRetType; |
Douglas Gregor | 926df6c | 2011-06-11 01:09:30 +0000 | [diff] [blame] | 1716 | QualType DeclaredRetType; |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 1717 | if (const FunctionDecl *FD = getCurFunctionDecl()) { |
Chris Lattner | 371f258 | 2008-12-04 23:50:19 +0000 | [diff] [blame] | 1718 | FnRetType = FD->getResultType(); |
Douglas Gregor | 926df6c | 2011-06-11 01:09:30 +0000 | [diff] [blame] | 1719 | DeclaredRetType = FnRetType; |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 1720 | if (FD->hasAttr<NoReturnAttr>() || |
| 1721 | FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) |
Chris Lattner | 8662587 | 2009-05-31 19:32:13 +0000 | [diff] [blame] | 1722 | Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 1723 | << getCurFunctionOrMethodDecl()->getDeclName(); |
Douglas Gregor | 926df6c | 2011-06-11 01:09:30 +0000 | [diff] [blame] | 1724 | } else if (ObjCMethodDecl *MD = getCurMethodDecl()) { |
| 1725 | DeclaredRetType = MD->getResultType(); |
| 1726 | if (MD->hasRelatedResultType() && MD->getClassInterface()) { |
| 1727 | // In the implementation of a method with a related return type, the |
| 1728 | // type used to type-check the validity of return statements within the |
| 1729 | // method body is a pointer to the type of the class being implemented. |
| 1730 | FnRetType = Context.getObjCInterfaceType(MD->getClassInterface()); |
| 1731 | FnRetType = Context.getObjCObjectPointerType(FnRetType); |
| 1732 | } else { |
| 1733 | FnRetType = DeclaredRetType; |
| 1734 | } |
| 1735 | } else // If we don't have a function/method context, bail. |
Steve Naroff | c97fb9a | 2009-03-03 00:45:38 +0000 | [diff] [blame] | 1736 | return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1737 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1738 | ReturnStmt *Result = 0; |
Chris Lattner | 5cf216b | 2008-01-04 18:04:52 +0000 | [diff] [blame] | 1739 | if (FnRetType->isVoidType()) { |
Nick Lewycky | 8d79461 | 2011-06-01 07:44:31 +0000 | [diff] [blame] | 1740 | if (RetValExp) { |
| 1741 | if (!RetValExp->isTypeDependent()) { |
| 1742 | // C99 6.8.6.4p1 (ext_ since GCC warns) |
| 1743 | unsigned D = diag::ext_return_has_expr; |
| 1744 | if (RetValExp->getType()->isVoidType()) |
| 1745 | D = diag::ext_return_has_void_expr; |
| 1746 | else { |
| 1747 | ExprResult Result = Owned(RetValExp); |
| 1748 | Result = IgnoredValueConversions(Result.take()); |
| 1749 | if (Result.isInvalid()) |
| 1750 | return StmtError(); |
| 1751 | RetValExp = Result.take(); |
| 1752 | RetValExp = ImpCastExprToType(RetValExp, |
| 1753 | Context.VoidTy, CK_ToVoid).take(); |
| 1754 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1755 | |
Nick Lewycky | 8d79461 | 2011-06-01 07:44:31 +0000 | [diff] [blame] | 1756 | // return (some void expression); is legal in C++. |
| 1757 | if (D != diag::ext_return_has_void_expr || |
| 1758 | !getLangOptions().CPlusPlus) { |
| 1759 | NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); |
| 1760 | Diag(ReturnLoc, D) |
| 1761 | << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) |
| 1762 | << RetValExp->getSourceRange(); |
| 1763 | } |
Chris Lattner | e878eb0 | 2008-12-18 02:03:48 +0000 | [diff] [blame] | 1764 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1765 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1766 | CheckImplicitConversions(RetValExp, ReturnLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1767 | RetValExp = MaybeCreateExprWithCleanups(RetValExp); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1768 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1769 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1770 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); |
| 1771 | } else if (!RetValExp && !FnRetType->isDependentType()) { |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 1772 | unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 |
| 1773 | // C99 6.8.6.4p1 (ext_ since GCC warns) |
| 1774 | if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; |
| 1775 | |
| 1776 | if (FunctionDecl *FD = getCurFunctionDecl()) |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 1777 | Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 1778 | else |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 1779 | Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1780 | Result = new (Context) ReturnStmt(ReturnLoc); |
| 1781 | } else { |
| 1782 | const VarDecl *NRVOCandidate = 0; |
| 1783 | if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { |
| 1784 | // we have a non-void function with an expression, continue checking |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1785 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1786 | // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| 1787 | // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
| 1788 | // function return. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1789 | |
John McCall | 856d379 | 2011-06-16 23:24:51 +0000 | [diff] [blame^] | 1790 | // In C++ the return statement is handled via a copy initialization, |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1791 | // the C version of which boils down to CheckSingleAssignmentConstraints. |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1792 | NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1793 | InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1794 | FnRetType, |
Francois Pichet | 58f14c0 | 2011-06-02 00:47:27 +0000 | [diff] [blame] | 1795 | NRVOCandidate != 0); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1796 | ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1797 | FnRetType, RetValExp); |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1798 | if (Res.isInvalid()) { |
| 1799 | // FIXME: Cleanup temporaries here, anyway? |
| 1800 | return StmtError(); |
| 1801 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1802 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1803 | RetValExp = Res.takeAs<Expr>(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1804 | if (RetValExp) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1805 | CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
Douglas Gregor | 66724ea | 2009-11-14 01:20:54 +0000 | [diff] [blame] | 1806 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1807 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1808 | if (RetValExp) { |
Douglas Gregor | 926df6c | 2011-06-11 01:09:30 +0000 | [diff] [blame] | 1809 | // If we type-checked an Objective-C method's return type based |
| 1810 | // on a related return type, we may need to adjust the return |
| 1811 | // type again. Do so now. |
| 1812 | if (DeclaredRetType != FnRetType) { |
| 1813 | ExprResult result = PerformImplicitConversion(RetValExp, |
| 1814 | DeclaredRetType, |
| 1815 | AA_Returning); |
| 1816 | if (result.isInvalid()) return StmtError(); |
| 1817 | RetValExp = result.take(); |
| 1818 | } |
| 1819 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1820 | CheckImplicitConversions(RetValExp, ReturnLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1821 | RetValExp = MaybeCreateExprWithCleanups(RetValExp); |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1822 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1823 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); |
Douglas Gregor | 898574e | 2008-12-05 23:32:09 +0000 | [diff] [blame] | 1824 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1825 | |
| 1826 | // If we need to check for the named return value optimization, save the |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1827 | // return statement in our scope for later processing. |
| 1828 | if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && |
| 1829 | !CurContext->isDependentContext()) |
| 1830 | FunctionScopes.back()->Returns.push_back(Result); |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1831 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1832 | return Owned(Result); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1833 | } |
| 1834 | |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1835 | /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently |
| 1836 | /// ignore "noop" casts in places where an lvalue is required by an inline asm. |
| 1837 | /// We emulate this behavior when -fheinous-gnu-extensions is specified, but |
| 1838 | /// provide a strong guidance to not use it. |
| 1839 | /// |
| 1840 | /// This method checks to see if the argument is an acceptable l-value and |
| 1841 | /// returns false if it is a case we can handle. |
| 1842 | static bool CheckAsmLValue(const Expr *E, Sema &S) { |
Anders Carlsson | 703e394 | 2010-01-24 05:50:09 +0000 | [diff] [blame] | 1843 | // Type dependent expressions will be checked during instantiation. |
| 1844 | if (E->isTypeDependent()) |
| 1845 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1846 | |
John McCall | 7eb0a9e | 2010-11-24 05:12:34 +0000 | [diff] [blame] | 1847 | if (E->isLValue()) |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1848 | return false; // Cool, this is an lvalue. |
| 1849 | |
| 1850 | // Okay, this is not an lvalue, but perhaps it is the result of a cast that we |
| 1851 | // are supposed to allow. |
| 1852 | const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); |
John McCall | 7eb0a9e | 2010-11-24 05:12:34 +0000 | [diff] [blame] | 1853 | if (E != E2 && E2->isLValue()) { |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1854 | if (!S.getLangOptions().HeinousExtensions) |
| 1855 | S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) |
| 1856 | << E->getSourceRange(); |
| 1857 | else |
| 1858 | S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) |
| 1859 | << E->getSourceRange(); |
| 1860 | // Accept, even if we emitted an error diagnostic. |
| 1861 | return false; |
| 1862 | } |
| 1863 | |
| 1864 | // None of the above, just randomly invalid non-lvalue. |
| 1865 | return true; |
| 1866 | } |
| 1867 | |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 1868 | /// isOperandMentioned - Return true if the specified operand # is mentioned |
| 1869 | /// anywhere in the decomposed asm string. |
| 1870 | static bool isOperandMentioned(unsigned OpNo, |
| 1871 | llvm::ArrayRef<AsmStmt::AsmStringPiece> AsmStrPieces) { |
| 1872 | for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) { |
| 1873 | const AsmStmt::AsmStringPiece &Piece = AsmStrPieces[p]; |
| 1874 | if (!Piece.isOperand()) continue; |
| 1875 | |
| 1876 | // If this is a reference to the input and if the input was the smaller |
| 1877 | // one, then we have to reject this asm. |
| 1878 | if (Piece.getOperandNo() == OpNo) |
| 1879 | return true; |
| 1880 | } |
| 1881 | |
| 1882 | return false; |
| 1883 | } |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1884 | |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 1885 | StmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, bool IsSimple, |
| 1886 | bool IsVolatile, unsigned NumOutputs, |
| 1887 | unsigned NumInputs, IdentifierInfo **Names, |
| 1888 | MultiExprArg constraints, MultiExprArg exprs, |
| 1889 | Expr *asmString, MultiExprArg clobbers, |
| 1890 | SourceLocation RParenLoc, bool MSAsm) { |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1891 | unsigned NumClobbers = clobbers.size(); |
| 1892 | StringLiteral **Constraints = |
| 1893 | reinterpret_cast<StringLiteral**>(constraints.get()); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1894 | Expr **Exprs = exprs.get(); |
| 1895 | StringLiteral *AsmString = cast<StringLiteral>(asmString); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1896 | StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); |
| 1897 | |
Anders Carlsson | 03eb543 | 2009-01-27 20:38:24 +0000 | [diff] [blame] | 1898 | llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1899 | |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1900 | // The parser verifies that there is a string literal here. |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1901 | if (AsmString->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1902 | return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) |
| 1903 | << AsmString->getSourceRange()); |
| 1904 | |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1905 | for (unsigned i = 0; i != NumOutputs; i++) { |
| 1906 | StringLiteral *Literal = Constraints[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1907 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1908 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1909 | << Literal->getSourceRange()); |
| 1910 | |
Anders Carlsson | ff93dbd | 2010-01-30 22:25:16 +0000 | [diff] [blame] | 1911 | llvm::StringRef OutputName; |
| 1912 | if (Names[i]) |
| 1913 | OutputName = Names[i]->getName(); |
| 1914 | |
| 1915 | TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1916 | if (!Context.Target.validateOutputConstraint(Info)) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1917 | return StmtError(Diag(Literal->getLocStart(), |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1918 | diag::err_asm_invalid_output_constraint) |
| 1919 | << Info.getConstraintStr()); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1920 | |
Anders Carlsson | d04c6e2 | 2007-11-27 04:11:28 +0000 | [diff] [blame] | 1921 | // Check that the output exprs are valid lvalues. |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1922 | Expr *OutputExpr = Exprs[i]; |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1923 | if (CheckAsmLValue(OutputExpr, *this)) { |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1924 | return StmtError(Diag(OutputExpr->getLocStart(), |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 1925 | diag::err_asm_invalid_lvalue_in_output) |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1926 | << OutputExpr->getSourceRange()); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1927 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1928 | |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1929 | OutputConstraintInfos.push_back(Info); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1930 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1931 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1932 | llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; |
| 1933 | |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1934 | for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1935 | StringLiteral *Literal = Constraints[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1936 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1937 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1938 | << Literal->getSourceRange()); |
| 1939 | |
Anders Carlsson | ff93dbd | 2010-01-30 22:25:16 +0000 | [diff] [blame] | 1940 | llvm::StringRef InputName; |
| 1941 | if (Names[i]) |
| 1942 | InputName = Names[i]->getName(); |
| 1943 | |
| 1944 | TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); |
Jay Foad | beaaccd | 2009-05-21 09:52:38 +0000 | [diff] [blame] | 1945 | if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), |
Chris Lattner | 2819fa8 | 2009-04-26 17:57:12 +0000 | [diff] [blame] | 1946 | NumOutputs, Info)) { |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1947 | return StmtError(Diag(Literal->getLocStart(), |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1948 | diag::err_asm_invalid_input_constraint) |
| 1949 | << Info.getConstraintStr()); |
Anders Carlsson | d04c6e2 | 2007-11-27 04:11:28 +0000 | [diff] [blame] | 1950 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1951 | |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1952 | Expr *InputExpr = Exprs[i]; |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1953 | |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1954 | // Only allow void types for memory constraints. |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1955 | if (Info.allowsMemory() && !Info.allowsRegister()) { |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1956 | if (CheckAsmLValue(InputExpr, *this)) |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1957 | return StmtError(Diag(InputExpr->getLocStart(), |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1958 | diag::err_asm_invalid_lvalue_in_input) |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1959 | << Info.getConstraintStr() |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1960 | << InputExpr->getSourceRange()); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1961 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1962 | |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1963 | if (Info.allowsRegister()) { |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1964 | if (InputExpr->getType()->isVoidType()) { |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1965 | return StmtError(Diag(InputExpr->getLocStart(), |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1966 | diag::err_asm_invalid_type_in_input) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1967 | << InputExpr->getType() << Info.getConstraintStr() |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1968 | << InputExpr->getSourceRange()); |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1969 | } |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1970 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1971 | |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 1972 | ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]); |
| 1973 | if (Result.isInvalid()) |
| 1974 | return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1975 | |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 1976 | Exprs[i] = Result.take(); |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1977 | InputConstraintInfos.push_back(Info); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1978 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1979 | |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 1980 | // Check that the clobbers are valid. |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1981 | for (unsigned i = 0; i != NumClobbers; i++) { |
| 1982 | StringLiteral *Literal = Clobbers[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1983 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1984 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1985 | << Literal->getSourceRange()); |
| 1986 | |
Anders Carlsson | fdba9c0 | 2010-01-30 19:34:25 +0000 | [diff] [blame] | 1987 | llvm::StringRef Clobber = Literal->getString(); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1988 | |
Anders Carlsson | fdba9c0 | 2010-01-30 19:34:25 +0000 | [diff] [blame] | 1989 | if (!Context.Target.isValidGCCRegisterName(Clobber)) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1990 | return StmtError(Diag(Literal->getLocStart(), |
Daniel Dunbar | 7765934 | 2009-08-19 20:04:03 +0000 | [diff] [blame] | 1991 | diag::err_asm_unknown_register_name) << Clobber); |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 1992 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1993 | |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1994 | AsmStmt *NS = |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1995 | new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, |
| 1996 | NumOutputs, NumInputs, Names, Constraints, Exprs, |
Anders Carlsson | 966146e | 2010-01-30 23:19:41 +0000 | [diff] [blame] | 1997 | AsmString, NumClobbers, Clobbers, RParenLoc); |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1998 | // Validate the asm string, ensuring it makes sense given the operands we |
| 1999 | // have. |
| 2000 | llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; |
| 2001 | unsigned DiagOffs; |
| 2002 | if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { |
Chris Lattner | 2ff0f42 | 2009-03-10 23:57:07 +0000 | [diff] [blame] | 2003 | Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) |
| 2004 | << AsmString->getSourceRange(); |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 2005 | return StmtError(); |
| 2006 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2007 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2008 | // Validate tied input operands for type mismatches. |
| 2009 | for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { |
| 2010 | TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2011 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2012 | // If this is a tied constraint, verify that the output and input have |
| 2013 | // either exactly the same type, or that they are int/ptr operands with the |
| 2014 | // same size (int/long, int*/long, are ok etc). |
| 2015 | if (!Info.hasTiedOperand()) continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2016 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2017 | unsigned TiedTo = Info.getTiedOperand(); |
Chris Lattner | 935f0f0 | 2011-02-21 22:09:29 +0000 | [diff] [blame] | 2018 | unsigned InputOpNo = i+NumOutputs; |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 2019 | Expr *OutputExpr = Exprs[TiedTo]; |
Chris Lattner | 935f0f0 | 2011-02-21 22:09:29 +0000 | [diff] [blame] | 2020 | Expr *InputExpr = Exprs[InputOpNo]; |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 2021 | QualType InTy = InputExpr->getType(); |
| 2022 | QualType OutTy = OutputExpr->getType(); |
| 2023 | if (Context.hasSameType(InTy, OutTy)) |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2024 | continue; // All types can be tied to themselves. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2025 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2026 | // Decide if the input and output are in the same domain (integer/ptr or |
| 2027 | // floating point. |
| 2028 | enum AsmDomain { |
| 2029 | AD_Int, AD_FP, AD_Other |
| 2030 | } InputDomain, OutputDomain; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2031 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2032 | if (InTy->isIntegerType() || InTy->isPointerType()) |
| 2033 | InputDomain = AD_Int; |
Douglas Gregor | 0c293ea | 2010-06-22 23:07:26 +0000 | [diff] [blame] | 2034 | else if (InTy->isRealFloatingType()) |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2035 | InputDomain = AD_FP; |
| 2036 | else |
| 2037 | InputDomain = AD_Other; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2038 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2039 | if (OutTy->isIntegerType() || OutTy->isPointerType()) |
| 2040 | OutputDomain = AD_Int; |
Douglas Gregor | 0c293ea | 2010-06-22 23:07:26 +0000 | [diff] [blame] | 2041 | else if (OutTy->isRealFloatingType()) |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2042 | OutputDomain = AD_FP; |
| 2043 | else |
| 2044 | OutputDomain = AD_Other; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2045 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2046 | // They are ok if they are the same size and in the same domain. This |
| 2047 | // allows tying things like: |
| 2048 | // void* to int* |
| 2049 | // void* to int if they are the same size. |
| 2050 | // double to long double if they are the same size. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2051 | // |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2052 | uint64_t OutSize = Context.getTypeSize(OutTy); |
| 2053 | uint64_t InSize = Context.getTypeSize(InTy); |
| 2054 | if (OutSize == InSize && InputDomain == OutputDomain && |
| 2055 | InputDomain != AD_Other) |
| 2056 | continue; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2057 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2058 | // If the smaller input/output operand is not mentioned in the asm string, |
Chris Lattner | f0c4d28 | 2011-02-21 21:50:25 +0000 | [diff] [blame] | 2059 | // then we can promote the smaller one to a larger input and the asm string |
| 2060 | // won't notice. |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2061 | bool SmallerValueMentioned = false; |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 2062 | |
| 2063 | // If this is a reference to the input and if the input was the smaller |
| 2064 | // one, then we have to reject this asm. |
Chris Lattner | 935f0f0 | 2011-02-21 22:09:29 +0000 | [diff] [blame] | 2065 | if (isOperandMentioned(InputOpNo, Pieces)) { |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 2066 | // This is a use in the asm string of the smaller operand. Since we |
| 2067 | // codegen this by promoting to a wider value, the asm will get printed |
| 2068 | // "wrong". |
Chris Lattner | f0c4d28 | 2011-02-21 21:50:25 +0000 | [diff] [blame] | 2069 | SmallerValueMentioned |= InSize < OutSize; |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 2070 | } |
Chris Lattner | f0c4d28 | 2011-02-21 21:50:25 +0000 | [diff] [blame] | 2071 | if (isOperandMentioned(TiedTo, Pieces)) { |
Chris Lattner | ca57b4b | 2011-02-21 21:40:33 +0000 | [diff] [blame] | 2072 | // If this is a reference to the output, and if the output is the larger |
| 2073 | // value, then it's ok because we'll promote the input to the larger type. |
Chris Lattner | f0c4d28 | 2011-02-21 21:50:25 +0000 | [diff] [blame] | 2074 | SmallerValueMentioned |= OutSize < InSize; |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2075 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2076 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 2077 | // If the smaller value wasn't mentioned in the asm string, and if the |
| 2078 | // output was a register, just extend the shorter one to the size of the |
| 2079 | // larger one. |
| 2080 | if (!SmallerValueMentioned && InputDomain != AD_Other && |
| 2081 | OutputConstraintInfos[TiedTo].allowsRegister()) |
| 2082 | continue; |
Chris Lattner | f0c4d28 | 2011-02-21 21:50:25 +0000 | [diff] [blame] | 2083 | |
Chris Lattner | 935f0f0 | 2011-02-21 22:09:29 +0000 | [diff] [blame] | 2084 | // Either both of the operands were mentioned or the smaller one was |
| 2085 | // mentioned. One more special case that we'll allow: if the tied input is |
| 2086 | // integer, unmentioned, and is a constant, then we'll allow truncating it |
| 2087 | // down to the size of the destination. |
| 2088 | if (InputDomain == AD_Int && OutputDomain == AD_Int && |
| 2089 | !isOperandMentioned(InputOpNo, Pieces) && |
| 2090 | InputExpr->isEvaluatable(Context)) { |
John McCall | 4da89c8 | 2011-05-10 23:39:47 +0000 | [diff] [blame] | 2091 | CastKind castKind = |
| 2092 | (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast); |
| 2093 | InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take(); |
Chris Lattner | 935f0f0 | 2011-02-21 22:09:29 +0000 | [diff] [blame] | 2094 | Exprs[InputOpNo] = InputExpr; |
| 2095 | NS->setInputExpr(i, InputExpr); |
| 2096 | continue; |
| 2097 | } |
| 2098 | |
Chris Lattner | c1f3b28 | 2009-05-03 06:50:40 +0000 | [diff] [blame] | 2099 | Diag(InputExpr->getLocStart(), |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2100 | diag::err_asm_tying_incompatible_types) |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 2101 | << InTy << OutTy << OutputExpr->getSourceRange() |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2102 | << InputExpr->getSourceRange(); |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 2103 | return StmtError(); |
| 2104 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2105 | |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 2106 | return Owned(NS); |
Chris Lattner | fe79595 | 2007-10-29 04:04:16 +0000 | [diff] [blame] | 2107 | } |
Fariborz Jahanian | 3b1191d | 2007-11-01 23:59:59 +0000 | [diff] [blame] | 2108 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2109 | StmtResult |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 2110 | Sema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 2111 | SourceLocation RParen, Decl *Parm, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2112 | Stmt *Body) { |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 2113 | VarDecl *Var = cast_or_null<VarDecl>(Parm); |
Douglas Gregor | 160b563 | 2010-04-26 17:32:49 +0000 | [diff] [blame] | 2114 | if (Var && Var->isInvalidDecl()) |
| 2115 | return StmtError(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2116 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2117 | return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); |
Fariborz Jahanian | 3b1191d | 2007-11-01 23:59:59 +0000 | [diff] [blame] | 2118 | } |
| 2119 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2120 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2121 | Sema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { |
| 2122 | return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); |
Fariborz Jahanian | 161a9c5 | 2007-11-02 00:18:53 +0000 | [diff] [blame] | 2123 | } |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 2124 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2125 | StmtResult |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2126 | Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2127 | MultiStmtArg CatchStmts, Stmt *Finally) { |
Anders Carlsson | da4b7cf | 2011-02-19 23:53:54 +0000 | [diff] [blame] | 2128 | if (!getLangOptions().ObjCExceptions) |
| 2129 | Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@try"; |
| 2130 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 2131 | getCurFunction()->setHasBranchProtectedScope(); |
Douglas Gregor | 8f5e3dd | 2010-04-23 22:50:49 +0000 | [diff] [blame] | 2132 | unsigned NumCatchStmts = CatchStmts.size(); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2133 | return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, |
| 2134 | CatchStmts.release(), |
Douglas Gregor | 8f5e3dd | 2010-04-23 22:50:49 +0000 | [diff] [blame] | 2135 | NumCatchStmts, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2136 | Finally)); |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 2137 | } |
| 2138 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2139 | StmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2140 | Expr *Throw) { |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 2141 | if (Throw) { |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 2142 | ExprResult Result = DefaultLvalueConversion(Throw); |
| 2143 | if (Result.isInvalid()) |
| 2144 | return StmtError(); |
John McCall | 5e3c67b | 2010-12-15 04:42:30 +0000 | [diff] [blame] | 2145 | |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 2146 | Throw = Result.take(); |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 2147 | QualType ThrowType = Throw->getType(); |
| 2148 | // Make sure the expression type is an ObjC pointer or "void *". |
| 2149 | if (!ThrowType->isDependentType() && |
| 2150 | !ThrowType->isObjCObjectPointerType()) { |
| 2151 | const PointerType *PT = ThrowType->getAs<PointerType>(); |
| 2152 | if (!PT || !PT->getPointeeType()->isVoidType()) |
| 2153 | return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) |
| 2154 | << Throw->getType() << Throw->getSourceRange()); |
| 2155 | } |
| 2156 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2157 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2158 | return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 2159 | } |
| 2160 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2161 | StmtResult |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2162 | Sema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 2163 | Scope *CurScope) { |
Anders Carlsson | da4b7cf | 2011-02-19 23:53:54 +0000 | [diff] [blame] | 2164 | if (!getLangOptions().ObjCExceptions) |
| 2165 | Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@throw"; |
| 2166 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2167 | if (!Throw) { |
Steve Naroff | e21dd6f | 2009-02-11 20:05:44 +0000 | [diff] [blame] | 2168 | // @throw without an expression designates a rethrow (which much occur |
| 2169 | // in the context of an @catch clause). |
| 2170 | Scope *AtCatchParent = CurScope; |
| 2171 | while (AtCatchParent && !AtCatchParent->isAtCatchScope()) |
| 2172 | AtCatchParent = AtCatchParent->getParent(); |
| 2173 | if (!AtCatchParent) |
Steve Naroff | 4ab2414 | 2009-02-12 18:09:32 +0000 | [diff] [blame] | 2174 | return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2175 | } |
| 2176 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2177 | return BuildObjCAtThrowStmt(AtLoc, Throw); |
Fariborz Jahanian | 39f8f15 | 2007-11-07 02:00:49 +0000 | [diff] [blame] | 2178 | } |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 2179 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2180 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2181 | Sema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, |
| 2182 | Stmt *SyncBody) { |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 2183 | getCurFunction()->setHasBranchProtectedScope(); |
Chris Lattner | 46c3c4b | 2009-04-21 06:01:00 +0000 | [diff] [blame] | 2184 | |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 2185 | ExprResult Result = DefaultLvalueConversion(SyncExpr); |
| 2186 | if (Result.isInvalid()) |
| 2187 | return StmtError(); |
John McCall | 5e3c67b | 2010-12-15 04:42:30 +0000 | [diff] [blame] | 2188 | |
John Wiegley | 429bb27 | 2011-04-08 18:41:53 +0000 | [diff] [blame] | 2189 | SyncExpr = Result.take(); |
Chris Lattner | a868a20 | 2009-04-21 06:11:25 +0000 | [diff] [blame] | 2190 | // Make sure the expression type is an ObjC pointer or "void *". |
Douglas Gregor | 8fdc13a | 2010-04-22 22:01:21 +0000 | [diff] [blame] | 2191 | if (!SyncExpr->getType()->isDependentType() && |
| 2192 | !SyncExpr->getType()->isObjCObjectPointerType()) { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 2193 | const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); |
Chris Lattner | a868a20 | 2009-04-21 06:11:25 +0000 | [diff] [blame] | 2194 | if (!PT || !PT->getPointeeType()->isVoidType()) |
| 2195 | return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) |
| 2196 | << SyncExpr->getType() << SyncExpr->getSourceRange()); |
| 2197 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2198 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2199 | return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); |
Fariborz Jahanian | fa3ee8e | 2008-01-29 19:14:59 +0000 | [diff] [blame] | 2200 | } |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 2201 | |
| 2202 | /// ActOnCXXCatchBlock - Takes an exception declaration and a handler block |
| 2203 | /// and creates a proper catch handler from them. |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2204 | StmtResult |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 2205 | Sema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2206 | Stmt *HandlerBlock) { |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 2207 | // There's nothing to test that ActOnExceptionDecl didn't already test. |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 2208 | return Owned(new (Context) CXXCatchStmt(CatchLoc, |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 2209 | cast_or_null<VarDecl>(ExDecl), |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2210 | HandlerBlock)); |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 2211 | } |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2212 | |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 2213 | StmtResult |
| 2214 | Sema::ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body) { |
| 2215 | getCurFunction()->setHasBranchProtectedScope(); |
| 2216 | return Owned(new (Context) ObjCAutoreleasePoolStmt(AtLoc, Body)); |
| 2217 | } |
| 2218 | |
Dan Gohman | 3c46e8d | 2010-07-26 21:25:24 +0000 | [diff] [blame] | 2219 | namespace { |
| 2220 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2221 | class TypeWithHandler { |
| 2222 | QualType t; |
| 2223 | CXXCatchStmt *stmt; |
| 2224 | public: |
| 2225 | TypeWithHandler(const QualType &type, CXXCatchStmt *statement) |
| 2226 | : t(type), stmt(statement) {} |
| 2227 | |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 2228 | // An arbitrary order is fine as long as it places identical |
| 2229 | // types next to each other. |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2230 | bool operator<(const TypeWithHandler &y) const { |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 2231 | if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2232 | return true; |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 2233 | if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2234 | return false; |
| 2235 | else |
| 2236 | return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); |
| 2237 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2238 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2239 | bool operator==(const TypeWithHandler& other) const { |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 2240 | return t == other.t; |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2241 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2242 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2243 | CXXCatchStmt *getCatchStmt() const { return stmt; } |
| 2244 | SourceLocation getTypeSpecStartLoc() const { |
| 2245 | return stmt->getExceptionDecl()->getTypeSpecStartLoc(); |
| 2246 | } |
| 2247 | }; |
| 2248 | |
Dan Gohman | 3c46e8d | 2010-07-26 21:25:24 +0000 | [diff] [blame] | 2249 | } |
| 2250 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2251 | /// ActOnCXXTryBlock - Takes a try compound-statement and a number of |
| 2252 | /// handlers and creates a try statement from them. |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 2253 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2254 | Sema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2255 | MultiStmtArg RawHandlers) { |
Anders Carlsson | 729b853 | 2011-02-23 03:46:46 +0000 | [diff] [blame] | 2256 | // Don't report an error if 'try' is used in system headers. |
Anders Carlsson | 15348ae | 2011-02-28 02:27:16 +0000 | [diff] [blame] | 2257 | if (!getLangOptions().CXXExceptions && |
Anders Carlsson | 729b853 | 2011-02-23 03:46:46 +0000 | [diff] [blame] | 2258 | !getSourceManager().isInSystemHeader(TryLoc)) |
| 2259 | Diag(TryLoc, diag::err_exceptions_disabled) << "try"; |
Anders Carlsson | 7f11d9c | 2011-02-19 19:26:44 +0000 | [diff] [blame] | 2260 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2261 | unsigned NumHandlers = RawHandlers.size(); |
| 2262 | assert(NumHandlers > 0 && |
| 2263 | "The parser shouldn't call this if there are no handlers."); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2264 | Stmt **Handlers = RawHandlers.get(); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2265 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2266 | llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2267 | |
| 2268 | for (unsigned i = 0; i < NumHandlers; ++i) { |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2269 | CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2270 | if (!Handler->getExceptionDecl()) { |
| 2271 | if (i < NumHandlers - 1) |
| 2272 | return StmtError(Diag(Handler->getLocStart(), |
| 2273 | diag::err_early_catch_all)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2274 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2275 | continue; |
| 2276 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2277 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2278 | const QualType CaughtType = Handler->getCaughtType(); |
| 2279 | const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); |
| 2280 | TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2281 | } |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2282 | |
| 2283 | // Detect handlers for the same type as an earlier one. |
| 2284 | if (NumHandlers > 1) { |
| 2285 | llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2286 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2287 | TypeWithHandler prev = TypesWithHandlers[0]; |
| 2288 | for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { |
| 2289 | TypeWithHandler curr = TypesWithHandlers[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2290 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2291 | if (curr == prev) { |
| 2292 | Diag(curr.getTypeSpecStartLoc(), |
| 2293 | diag::warn_exception_caught_by_earlier_handler) |
| 2294 | << curr.getCatchStmt()->getCaughtType().getAsString(); |
| 2295 | Diag(prev.getTypeSpecStartLoc(), |
| 2296 | diag::note_previous_exception_handler) |
| 2297 | << prev.getCatchStmt()->getCaughtType().getAsString(); |
| 2298 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2299 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 2300 | prev = curr; |
| 2301 | } |
| 2302 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2303 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 2304 | getCurFunction()->setHasBranchProtectedScope(); |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 2305 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2306 | // FIXME: We should detect handlers that cannot catch anything because an |
| 2307 | // earlier handler catches a superclass. Need to find a method that is not |
| 2308 | // quadratic for this. |
| 2309 | // Neither of these are explicitly forbidden, but every compiler detects them |
| 2310 | // and warns. |
| 2311 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 2312 | return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, |
Sam Weinig | a1a396d | 2010-02-03 03:56:39 +0000 | [diff] [blame] | 2313 | Handlers, NumHandlers)); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 2314 | } |
John Wiegley | 28bbe4b | 2011-04-28 01:08:34 +0000 | [diff] [blame] | 2315 | |
| 2316 | StmtResult |
| 2317 | Sema::ActOnSEHTryBlock(bool IsCXXTry, |
| 2318 | SourceLocation TryLoc, |
| 2319 | Stmt *TryBlock, |
| 2320 | Stmt *Handler) { |
| 2321 | assert(TryBlock && Handler); |
| 2322 | |
| 2323 | getCurFunction()->setHasBranchProtectedScope(); |
| 2324 | |
| 2325 | return Owned(SEHTryStmt::Create(Context,IsCXXTry,TryLoc,TryBlock,Handler)); |
| 2326 | } |
| 2327 | |
| 2328 | StmtResult |
| 2329 | Sema::ActOnSEHExceptBlock(SourceLocation Loc, |
| 2330 | Expr *FilterExpr, |
| 2331 | Stmt *Block) { |
| 2332 | assert(FilterExpr && Block); |
| 2333 | |
| 2334 | if(!FilterExpr->getType()->isIntegerType()) { |
Francois Pichet | 58f14c0 | 2011-06-02 00:47:27 +0000 | [diff] [blame] | 2335 | return StmtError(Diag(FilterExpr->getExprLoc(), |
| 2336 | diag::err_filter_expression_integral) |
| 2337 | << FilterExpr->getType()); |
John Wiegley | 28bbe4b | 2011-04-28 01:08:34 +0000 | [diff] [blame] | 2338 | } |
| 2339 | |
| 2340 | return Owned(SEHExceptStmt::Create(Context,Loc,FilterExpr,Block)); |
| 2341 | } |
| 2342 | |
| 2343 | StmtResult |
| 2344 | Sema::ActOnSEHFinallyBlock(SourceLocation Loc, |
| 2345 | Stmt *Block) { |
| 2346 | assert(Block); |
| 2347 | return Owned(SEHFinallyStmt::Create(Context,Loc,Block)); |
| 2348 | } |
| 2349 | |