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" |
Anders Carlsson | 51fe996 | 2008-11-22 21:04:56 +0000 | [diff] [blame] | 18 | #include "clang/AST/APValue.h" |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 19 | #include "clang/AST/ASTContext.h" |
Daniel Dunbar | c4a1dea | 2008-08-11 05:35:13 +0000 | [diff] [blame] | 20 | #include "clang/AST/DeclObjC.h" |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 21 | #include "clang/AST/ExprCXX.h" |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 22 | #include "clang/AST/ExprObjC.h" |
Chris Lattner | 16f0049 | 2009-04-26 01:32:48 +0000 | [diff] [blame] | 23 | #include "clang/AST/StmtObjC.h" |
| 24 | #include "clang/AST/StmtCXX.h" |
John McCall | 209acbd | 2010-04-06 22:24:14 +0000 | [diff] [blame] | 25 | #include "clang/AST/TypeLoc.h" |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 26 | #include "clang/Lex/Preprocessor.h" |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 27 | #include "clang/Basic/TargetInfo.h" |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 28 | #include "llvm/ADT/STLExtras.h" |
| 29 | #include "llvm/ADT/SmallVector.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 30 | using namespace clang; |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 31 | using namespace sema; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 32 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 33 | StmtResult Sema::ActOnExprStmt(FullExprArg expr) { |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 34 | Expr *E = expr.get(); |
Douglas Gregor | bebbe0d | 2010-12-15 01:34:56 +0000 | [diff] [blame] | 35 | if (!E) // FIXME: FullExprArg has no error state? |
| 36 | return StmtError(); |
| 37 | |
Chris Lattner | 834a72a | 2008-07-25 23:18:17 +0000 | [diff] [blame] | 38 | // C99 6.8.3p2: The expression in an expression statement is evaluated as a |
| 39 | // void expression for its side effects. Conversion to void allows any |
| 40 | // operand, even incomplete types. |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 41 | |
Chris Lattner | 834a72a | 2008-07-25 23:18:17 +0000 | [diff] [blame] | 42 | // Same thing in for stmt first clause (when expr) and third clause. |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 43 | return Owned(static_cast<Stmt*>(E)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 47 | StmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc, bool LeadingEmptyMacro) { |
| 48 | return Owned(new (Context) NullStmt(SemiLoc, LeadingEmptyMacro)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 49 | } |
| 50 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 51 | StmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 52 | SourceLocation StartLoc, |
| 53 | SourceLocation EndLoc) { |
Chris Lattner | 682bf92 | 2009-03-29 16:50:03 +0000 | [diff] [blame] | 54 | DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 55 | |
Chris Lattner | 2040169 | 2009-04-12 20:13:14 +0000 | [diff] [blame] | 56 | // If we have an invalid decl, just return an error. |
| 57 | if (DG.isNull()) return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 58 | |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 59 | return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 60 | } |
| 61 | |
Fariborz Jahanian | a7cf23a | 2009-11-19 22:12:37 +0000 | [diff] [blame] | 62 | void Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { |
| 63 | DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); |
| 64 | |
| 65 | // If we have an invalid decl, just return. |
| 66 | if (DG.isNull() || !DG.isSingleDecl()) return; |
| 67 | // suppress any potential 'unused variable' warning. |
| 68 | DG.getSingleDecl()->setUsed(); |
| 69 | } |
| 70 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 71 | void Sema::DiagnoseUnusedExprResult(const Stmt *S) { |
Argyrios Kyrtzidis | d2827af | 2010-09-19 21:21:10 +0000 | [diff] [blame] | 72 | if (const LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S)) |
| 73 | return DiagnoseUnusedExprResult(Label->getSubStmt()); |
| 74 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 75 | const Expr *E = dyn_cast_or_null<Expr>(S); |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 76 | if (!E) |
| 77 | return; |
| 78 | |
Argyrios Kyrtzidis | 11ab790 | 2010-11-01 18:49:26 +0000 | [diff] [blame] | 79 | if (E->isBoundMemberFunction(Context)) { |
| 80 | Diag(E->getLocStart(), diag::err_invalid_use_of_bound_member_func) |
| 81 | << E->getSourceRange(); |
| 82 | return; |
| 83 | } |
| 84 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 85 | SourceLocation Loc; |
| 86 | SourceRange R1, R2; |
Mike Stump | df317bf | 2009-11-03 23:25:48 +0000 | [diff] [blame] | 87 | if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 88 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 89 | |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 90 | // Okay, we have an unused result. Depending on what the base expression is, |
| 91 | // we might want to make a more specific diagnostic. Check for one of these |
| 92 | // cases now. |
| 93 | unsigned DiagID = diag::warn_unused_expr; |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 94 | if (const ExprWithCleanups *Temps = dyn_cast<ExprWithCleanups>(E)) |
Douglas Gregor | 4dffad6 | 2010-02-11 22:55:30 +0000 | [diff] [blame] | 95 | E = Temps->getSubExpr(); |
John McCall | 12f78a6 | 2010-12-02 01:19:52 +0000 | [diff] [blame] | 96 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 97 | E = E->IgnoreParenImpCasts(); |
Chris Lattner | bc8d42c | 2009-10-13 04:53:48 +0000 | [diff] [blame] | 98 | if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { |
John McCall | 0faede6 | 2010-03-12 07:11:26 +0000 | [diff] [blame] | 99 | if (E->getType()->isVoidType()) |
| 100 | return; |
| 101 | |
Chris Lattner | bc8d42c | 2009-10-13 04:53:48 +0000 | [diff] [blame] | 102 | // If the callee has attribute pure, const, or warn_unused_result, warn with |
| 103 | // a more specific message to make it clear what is happening. |
Nuno Lopes | d20254f | 2009-12-20 23:11:08 +0000 | [diff] [blame] | 104 | if (const Decl *FD = CE->getCalleeDecl()) { |
Chris Lattner | bc8d42c | 2009-10-13 04:53:48 +0000 | [diff] [blame] | 105 | if (FD->getAttr<WarnUnusedResultAttr>()) { |
| 106 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; |
| 107 | return; |
| 108 | } |
| 109 | if (FD->getAttr<PureAttr>()) { |
| 110 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; |
| 111 | return; |
| 112 | } |
| 113 | if (FD->getAttr<ConstAttr>()) { |
| 114 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; |
| 115 | return; |
| 116 | } |
| 117 | } |
John McCall | 12f78a6 | 2010-12-02 01:19:52 +0000 | [diff] [blame] | 118 | } else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { |
Fariborz Jahanian | f031774 | 2010-03-30 18:22:15 +0000 | [diff] [blame] | 119 | const ObjCMethodDecl *MD = ME->getMethodDecl(); |
| 120 | if (MD && MD->getAttr<WarnUnusedResultAttr>()) { |
| 121 | Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result"; |
| 122 | return; |
| 123 | } |
John McCall | 12f78a6 | 2010-12-02 01:19:52 +0000 | [diff] [blame] | 124 | } else if (isa<ObjCPropertyRefExpr>(E)) { |
| 125 | DiagID = diag::warn_unused_property_expr; |
Douglas Gregor | d6e44a3 | 2010-04-16 22:09:46 +0000 | [diff] [blame] | 126 | } else if (const CXXFunctionalCastExpr *FC |
| 127 | = dyn_cast<CXXFunctionalCastExpr>(E)) { |
| 128 | if (isa<CXXConstructExpr>(FC->getSubExpr()) || |
| 129 | isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) |
| 130 | return; |
Fariborz Jahanian | f031774 | 2010-03-30 18:22:15 +0000 | [diff] [blame] | 131 | } |
John McCall | 209acbd | 2010-04-06 22:24:14 +0000 | [diff] [blame] | 132 | // Diagnose "(void*) blah" as a typo for "(void) blah". |
| 133 | else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { |
| 134 | TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); |
| 135 | QualType T = TI->getType(); |
| 136 | |
| 137 | // We really do want to use the non-canonical type here. |
| 138 | if (T == Context.VoidPtrTy) { |
| 139 | PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); |
| 140 | |
| 141 | Diag(Loc, diag::warn_unused_voidptr) |
| 142 | << FixItHint::CreateRemoval(TL.getStarLoc()); |
| 143 | return; |
| 144 | } |
| 145 | } |
| 146 | |
Douglas Gregor | 35e12c9 | 2010-07-15 18:47:04 +0000 | [diff] [blame] | 147 | DiagRuntimeBehavior(Loc, PDiag(DiagID) << R1 << R2); |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 148 | } |
| 149 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 150 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 151 | Sema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 152 | MultiStmtArg elts, bool isStmtExpr) { |
| 153 | unsigned NumElts = elts.size(); |
| 154 | Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 155 | // If we're in C89 mode, check that we don't have any decls after stmts. If |
| 156 | // so, emit an extension diagnostic. |
| 157 | if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { |
| 158 | // Note that __extension__ can be around a decl. |
| 159 | unsigned i = 0; |
| 160 | // Skip over all declarations. |
| 161 | for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) |
| 162 | /*empty*/; |
| 163 | |
| 164 | // We found the end of the list or a statement. Scan for another declstmt. |
| 165 | for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) |
| 166 | /*empty*/; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 167 | |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 168 | if (i != NumElts) { |
Douglas Gregor | 4afa39d | 2009-01-20 01:17:11 +0000 | [diff] [blame] | 169 | Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 170 | Diag(D->getLocation(), diag::ext_mixed_decls_code); |
| 171 | } |
| 172 | } |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 173 | // Warn about unused expressions in statements. |
| 174 | for (unsigned i = 0; i != NumElts; ++i) { |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 175 | // Ignore statements that are last in a statement expression. |
| 176 | if (isStmtExpr && i == NumElts - 1) |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 177 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 178 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 179 | DiagnoseUnusedExprResult(Elts[i]); |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 180 | } |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 181 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 182 | return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 183 | } |
| 184 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 185 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 186 | Sema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, |
| 187 | SourceLocation DotDotDotLoc, Expr *RHSVal, |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 188 | SourceLocation ColonLoc) { |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 189 | assert((LHSVal != 0) && "missing expression in case statement"); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 190 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 191 | // C99 6.8.4.2p3: The expression shall be an integer constant. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 192 | // However, GCC allows any evaluatable integer expression. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 193 | if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 194 | VerifyIntegerConstantExpression(LHSVal)) |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 195 | return StmtError(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 196 | |
Chris Lattner | 6c36be5 | 2007-07-18 02:28:47 +0000 | [diff] [blame] | 197 | // GCC extension: The expression shall be an integer constant. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 198 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 199 | if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && |
| 200 | VerifyIntegerConstantExpression(RHSVal)) { |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 201 | RHSVal = 0; // Recover by just forgetting about it. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 202 | } |
| 203 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 204 | if (getCurFunction()->SwitchStack.empty()) { |
Chris Lattner | 8a87e57 | 2007-07-23 17:05:23 +0000 | [diff] [blame] | 205 | Diag(CaseLoc, diag::err_case_not_in_switch); |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 206 | return StmtError(); |
Chris Lattner | 8a87e57 | 2007-07-23 17:05:23 +0000 | [diff] [blame] | 207 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 208 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 209 | CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, |
| 210 | ColonLoc); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 211 | getCurFunction()->SwitchStack.back()->addSwitchCase(CS); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 212 | return Owned(CS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 213 | } |
| 214 | |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 215 | /// ActOnCaseStmtBody - This installs a statement as the body of a case. |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 216 | void Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 217 | CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 218 | CS->setSubStmt(SubStmt); |
| 219 | } |
| 220 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 221 | StmtResult |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 222 | Sema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 223 | Stmt *SubStmt, Scope *CurScope) { |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 224 | if (getCurFunction()->SwitchStack.empty()) { |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 225 | Diag(DefaultLoc, diag::err_default_not_in_switch); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 226 | return Owned(SubStmt); |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 227 | } |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 228 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 229 | DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 230 | getCurFunction()->SwitchStack.back()->addSwitchCase(DS); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 231 | return Owned(DS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 232 | } |
| 233 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 234 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 235 | Sema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, |
Argyrios Kyrtzidis | 1a18600 | 2010-09-28 14:54:07 +0000 | [diff] [blame] | 236 | SourceLocation ColonLoc, Stmt *SubStmt, |
| 237 | const AttributeList *Attr) { |
| 238 | // According to GCC docs, "the only attribute that makes sense after a label |
| 239 | // is 'unused'". |
| 240 | bool HasUnusedAttr = false; |
Ted Kremenek | 8113ecf | 2010-11-10 05:59:39 +0000 | [diff] [blame] | 241 | for ( ; Attr; Attr = Attr->getNext()) { |
| 242 | if (Attr->getKind() == AttributeList::AT_unused) { |
Argyrios Kyrtzidis | 1a18600 | 2010-09-28 14:54:07 +0000 | [diff] [blame] | 243 | HasUnusedAttr = true; |
| 244 | } else { |
Ted Kremenek | 8113ecf | 2010-11-10 05:59:39 +0000 | [diff] [blame] | 245 | Diag(Attr->getLoc(), diag::warn_label_attribute_not_unused); |
| 246 | Attr->setInvalid(true); |
Argyrios Kyrtzidis | 1a18600 | 2010-09-28 14:54:07 +0000 | [diff] [blame] | 247 | } |
| 248 | } |
| 249 | |
| 250 | return ActOnLabelStmt(IdentLoc, II, ColonLoc, SubStmt, HasUnusedAttr); |
| 251 | } |
| 252 | |
| 253 | StmtResult |
| 254 | Sema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, |
| 255 | SourceLocation ColonLoc, Stmt *SubStmt, |
| 256 | bool HasUnusedAttr) { |
Steve Naroff | f3cf897 | 2009-02-28 16:48:43 +0000 | [diff] [blame] | 257 | // Look up the record for this label identifier. |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 258 | LabelStmt *&LabelDecl = getCurFunction()->LabelMap[II]; |
Steve Naroff | f3cf897 | 2009-02-28 16:48:43 +0000 | [diff] [blame] | 259 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 260 | // If not forward referenced or defined already, just create a new LabelStmt. |
Steve Naroff | caaacec | 2009-03-13 15:38:40 +0000 | [diff] [blame] | 261 | if (LabelDecl == 0) |
Argyrios Kyrtzidis | 1a18600 | 2010-09-28 14:54:07 +0000 | [diff] [blame] | 262 | return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt, |
| 263 | HasUnusedAttr)); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 264 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 265 | assert(LabelDecl->getID() == II && "Label mismatch!"); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 266 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 267 | // Otherwise, this label was either forward reference or multiply defined. If |
| 268 | // multiply defined, reject it now. |
| 269 | if (LabelDecl->getSubStmt()) { |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 270 | Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); |
Chris Lattner | 5f4a682 | 2008-11-23 23:12:31 +0000 | [diff] [blame] | 271 | Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 272 | return Owned(SubStmt); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 273 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 274 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 275 | // Otherwise, this label was forward declared, and we just found its real |
| 276 | // definition. Fill in the forward definition and return it. |
| 277 | LabelDecl->setIdentLoc(IdentLoc); |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 278 | LabelDecl->setSubStmt(SubStmt); |
Argyrios Kyrtzidis | 1a18600 | 2010-09-28 14:54:07 +0000 | [diff] [blame] | 279 | LabelDecl->setUnusedAttribute(HasUnusedAttr); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 280 | return Owned(LabelDecl); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 281 | } |
| 282 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 283 | StmtResult |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 284 | Sema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 285 | Stmt *thenStmt, SourceLocation ElseLoc, |
| 286 | Stmt *elseStmt) { |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 287 | ExprResult CondResult(CondVal.release()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 288 | |
Douglas Gregor | 8cfe5a7 | 2009-11-23 23:44:04 +0000 | [diff] [blame] | 289 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 290 | if (CondVar) { |
| 291 | ConditionVar = cast<VarDecl>(CondVar); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 292 | CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 293 | if (CondResult.isInvalid()) |
| 294 | return StmtError(); |
Douglas Gregor | 8cfe5a7 | 2009-11-23 23:44:04 +0000 | [diff] [blame] | 295 | } |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 296 | Expr *ConditionExpr = CondResult.takeAs<Expr>(); |
| 297 | if (!ConditionExpr) |
| 298 | return StmtError(); |
Douglas Gregor | 8cfe5a7 | 2009-11-23 23:44:04 +0000 | [diff] [blame] | 299 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 300 | DiagnoseUnusedExprResult(thenStmt); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 301 | |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 302 | // Warn if the if block has a null body without an else value. |
| 303 | // this helps prevent bugs due to typos, such as |
| 304 | // if (condition); |
| 305 | // do_stuff(); |
Ted Kremenek | b319817 | 2010-09-16 00:37:05 +0000 | [diff] [blame] | 306 | // |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 307 | if (!elseStmt) { |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 308 | if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) |
Argyrios Kyrtzidis | a25b6a4 | 2010-11-19 20:54:25 +0000 | [diff] [blame] | 309 | // But do not warn if the body is a macro that expands to nothing, e.g: |
| 310 | // |
| 311 | // #define CALL(x) |
| 312 | // if (condition) |
| 313 | // CALL(0); |
| 314 | // |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 315 | if (!stmt->hasLeadingEmptyMacro()) |
Ted Kremenek | b319817 | 2010-09-16 00:37:05 +0000 | [diff] [blame] | 316 | Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 317 | } |
| 318 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 319 | DiagnoseUnusedExprResult(elseStmt); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 320 | |
Douglas Gregor | 43dec6b | 2010-06-21 23:44:13 +0000 | [diff] [blame] | 321 | return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, |
Argyrios Kyrtzidis | 44aa1f3 | 2010-11-20 02:04:01 +0000 | [diff] [blame] | 322 | thenStmt, ElseLoc, elseStmt)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 323 | } |
| 324 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 325 | /// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have |
| 326 | /// the specified width and sign. If an overflow occurs, detect it and emit |
| 327 | /// the specified diagnostic. |
| 328 | void Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, |
| 329 | unsigned NewWidth, bool NewSign, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 330 | SourceLocation Loc, |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 331 | unsigned DiagID) { |
| 332 | // Perform a conversion to the promoted condition type if needed. |
| 333 | if (NewWidth > Val.getBitWidth()) { |
| 334 | // If this is an extension, just do it. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 335 | Val = Val.extend(NewWidth); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 336 | Val.setIsSigned(NewSign); |
Douglas Gregor | f9f627d | 2010-03-01 01:04:55 +0000 | [diff] [blame] | 337 | |
| 338 | // If the input was signed and negative and the output is |
| 339 | // unsigned, don't bother to warn: this is implementation-defined |
| 340 | // behavior. |
| 341 | // FIXME: Introduce a second, default-ignored warning for this case? |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 342 | } else if (NewWidth < Val.getBitWidth()) { |
| 343 | // If this is a truncation, check for overflow. |
| 344 | llvm::APSInt ConvVal(Val); |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 345 | ConvVal = ConvVal.trunc(NewWidth); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 346 | ConvVal.setIsSigned(NewSign); |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 347 | ConvVal = ConvVal.extend(Val.getBitWidth()); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 348 | ConvVal.setIsSigned(Val.isSigned()); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 349 | if (ConvVal != Val) |
Chris Lattner | d3a94e2 | 2008-11-20 06:06:08 +0000 | [diff] [blame] | 350 | Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 351 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 352 | // Regardless of whether a diagnostic was emitted, really do the |
| 353 | // truncation. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 354 | Val = Val.trunc(NewWidth); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 355 | Val.setIsSigned(NewSign); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 356 | } else if (NewSign != Val.isSigned()) { |
| 357 | // Convert the sign to match the sign of the condition. This can cause |
| 358 | // overflow as well: unsigned(INTMIN) |
Douglas Gregor | 2853eac | 2010-02-18 00:56:01 +0000 | [diff] [blame] | 359 | // We don't diagnose this overflow, because it is implementation-defined |
| 360 | // behavior. |
| 361 | // FIXME: Introduce a second, default-ignored warning for this case? |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 362 | llvm::APSInt OldVal(Val); |
| 363 | Val.setIsSigned(NewSign); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 364 | } |
| 365 | } |
| 366 | |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 367 | namespace { |
| 368 | struct CaseCompareFunctor { |
| 369 | bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| 370 | const llvm::APSInt &RHS) { |
| 371 | return LHS.first < RHS; |
| 372 | } |
Chris Lattner | 0e85a27 | 2007-09-03 18:31:57 +0000 | [diff] [blame] | 373 | bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| 374 | const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| 375 | return LHS.first < RHS.first; |
| 376 | } |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 377 | bool operator()(const llvm::APSInt &LHS, |
| 378 | const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| 379 | return LHS < RHS.first; |
| 380 | } |
| 381 | }; |
| 382 | } |
| 383 | |
Chris Lattner | 764a7ce | 2007-09-21 18:15:22 +0000 | [diff] [blame] | 384 | /// CmpCaseVals - Comparison predicate for sorting case values. |
| 385 | /// |
| 386 | static bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, |
| 387 | const std::pair<llvm::APSInt, CaseStmt*>& rhs) { |
| 388 | if (lhs.first < rhs.first) |
| 389 | return true; |
| 390 | |
| 391 | if (lhs.first == rhs.first && |
| 392 | lhs.second->getCaseLoc().getRawEncoding() |
| 393 | < rhs.second->getCaseLoc().getRawEncoding()) |
| 394 | return true; |
| 395 | return false; |
| 396 | } |
| 397 | |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 398 | /// CmpEnumVals - Comparison predicate for sorting enumeration values. |
| 399 | /// |
| 400 | static bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, |
| 401 | const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) |
| 402 | { |
| 403 | return lhs.first < rhs.first; |
| 404 | } |
| 405 | |
| 406 | /// EqEnumVals - Comparison preficate for uniqing enumeration values. |
| 407 | /// |
| 408 | static bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, |
| 409 | const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) |
| 410 | { |
| 411 | return lhs.first == rhs.first; |
| 412 | } |
| 413 | |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 414 | /// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of |
| 415 | /// potentially integral-promoted expression @p expr. |
| 416 | static QualType GetTypeBeforeIntegralPromotion(const Expr* expr) { |
John McCall | 6907fbe | 2010-06-12 01:56:02 +0000 | [diff] [blame] | 417 | if (const CastExpr *ImplicitCast = dyn_cast<ImplicitCastExpr>(expr)) { |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 418 | const Expr *ExprBeforePromotion = ImplicitCast->getSubExpr(); |
| 419 | QualType TypeBeforePromotion = ExprBeforePromotion->getType(); |
Douglas Gregor | 2ade35e | 2010-06-16 00:17:44 +0000 | [diff] [blame] | 420 | if (TypeBeforePromotion->isIntegralOrEnumerationType()) { |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 421 | return TypeBeforePromotion; |
| 422 | } |
| 423 | } |
| 424 | return expr->getType(); |
| 425 | } |
| 426 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 427 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 428 | Sema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 429 | Decl *CondVar) { |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 430 | ExprResult CondResult; |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 431 | |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 432 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 433 | if (CondVar) { |
| 434 | ConditionVar = cast<VarDecl>(CondVar); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 435 | CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); |
| 436 | if (CondResult.isInvalid()) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 437 | return StmtError(); |
Douglas Gregor | eecf38f | 2010-05-06 21:39:56 +0000 | [diff] [blame] | 438 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 439 | Cond = CondResult.release(); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 440 | } |
| 441 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 442 | if (!Cond) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 443 | return StmtError(); |
| 444 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 445 | CondResult |
| 446 | = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, |
Douglas Gregor | c30614b | 2010-06-29 23:17:37 +0000 | [diff] [blame] | 447 | PDiag(diag::err_typecheck_statement_requires_integer), |
| 448 | PDiag(diag::err_switch_incomplete_class_type) |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 449 | << Cond->getSourceRange(), |
Douglas Gregor | c30614b | 2010-06-29 23:17:37 +0000 | [diff] [blame] | 450 | PDiag(diag::err_switch_explicit_conversion), |
| 451 | PDiag(diag::note_switch_conversion), |
| 452 | PDiag(diag::err_switch_multiple_conversions), |
Douglas Gregor | 6bc574d | 2010-06-30 00:20:43 +0000 | [diff] [blame] | 453 | PDiag(diag::note_switch_conversion), |
| 454 | PDiag(0)); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 455 | if (CondResult.isInvalid()) return StmtError(); |
| 456 | Cond = CondResult.take(); |
Douglas Gregor | c30614b | 2010-06-29 23:17:37 +0000 | [diff] [blame] | 457 | |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 458 | if (!CondVar) { |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 459 | CheckImplicitConversions(Cond, SwitchLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 460 | CondResult = MaybeCreateExprWithCleanups(Cond); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 461 | if (CondResult.isInvalid()) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 462 | return StmtError(); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 463 | Cond = CondResult.take(); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 464 | } |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 465 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 466 | getCurFunction()->setHasBranchIntoScope(); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 467 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 468 | SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 469 | getCurFunction()->SwitchStack.push_back(SS); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 470 | return Owned(SS); |
Chris Lattner | 7e52de4 | 2010-01-24 01:50:29 +0000 | [diff] [blame] | 471 | } |
| 472 | |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 473 | static void AdjustAPSInt(llvm::APSInt &Val, unsigned BitWidth, bool IsSigned) { |
| 474 | if (Val.getBitWidth() < BitWidth) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 475 | Val = Val.extend(BitWidth); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 476 | else if (Val.getBitWidth() > BitWidth) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 477 | Val = Val.trunc(BitWidth); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 478 | Val.setIsSigned(IsSigned); |
| 479 | } |
| 480 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 481 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 482 | Sema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, |
| 483 | Stmt *BodyStmt) { |
| 484 | SwitchStmt *SS = cast<SwitchStmt>(Switch); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 485 | assert(SS == getCurFunction()->SwitchStack.back() && |
| 486 | "switch stack missing push/pop!"); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 487 | |
Steve Naroff | 9dcbfa4 | 2007-09-01 21:08:38 +0000 | [diff] [blame] | 488 | SS->setBody(BodyStmt, SwitchLoc); |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 489 | getCurFunction()->SwitchStack.pop_back(); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 490 | |
Douglas Gregor | ff331c1 | 2010-07-25 18:17:45 +0000 | [diff] [blame] | 491 | if (SS->getCond() == 0) |
Douglas Gregor | be724ba | 2009-11-25 06:20:02 +0000 | [diff] [blame] | 492 | return StmtError(); |
Douglas Gregor | be724ba | 2009-11-25 06:20:02 +0000 | [diff] [blame] | 493 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 494 | Expr *CondExpr = SS->getCond(); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 495 | Expr *CondExprBeforePromotion = CondExpr; |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 496 | QualType CondTypeBeforePromotion = |
| 497 | GetTypeBeforeIntegralPromotion(CondExpr); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 498 | |
Douglas Gregor | 0de55e7 | 2009-11-25 15:17:36 +0000 | [diff] [blame] | 499 | // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. |
| 500 | UsualUnaryConversions(CondExpr); |
Douglas Gregor | a0d3ca1 | 2009-11-25 05:02:21 +0000 | [diff] [blame] | 501 | QualType CondType = CondExpr->getType(); |
Douglas Gregor | 84fb9c0 | 2009-11-23 13:46:08 +0000 | [diff] [blame] | 502 | SS->setCond(CondExpr); |
| 503 | |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 504 | // C++ 6.4.2.p2: |
| 505 | // Integral promotions are performed (on the switch condition). |
| 506 | // |
| 507 | // A case value unrepresentable by the original switch condition |
| 508 | // type (before the promotion) doesn't make sense, even when it can |
| 509 | // be represented by the promoted type. Therefore we need to find |
| 510 | // the pre-promotion type of the switch condition. |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 511 | if (!CondExpr->isTypeDependent()) { |
Douglas Gregor | acb0bd8 | 2010-06-29 23:25:20 +0000 | [diff] [blame] | 512 | // We have already converted the expression to an integral or enumeration |
| 513 | // type, when we started the switch statement. If we don't have an |
| 514 | // appropriate type now, just return an error. |
| 515 | if (!CondType->isIntegralOrEnumerationType()) |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 516 | return StmtError(); |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 517 | |
Chris Lattner | 2b334bb | 2010-04-16 23:34:13 +0000 | [diff] [blame] | 518 | if (CondExpr->isKnownToHaveBooleanValue()) { |
Edward O'Callaghan | 12356b1 | 2009-10-17 19:32:54 +0000 | [diff] [blame] | 519 | // switch(bool_expr) {...} is often a programmer error, e.g. |
| 520 | // switch(n && mask) { ... } // Doh - should be "n & mask". |
| 521 | // One can always use an if statement instead of switch(bool_expr). |
| 522 | Diag(SwitchLoc, diag::warn_bool_switch_condition) |
| 523 | << CondExpr->getSourceRange(); |
| 524 | } |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 525 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 526 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 527 | // Get the bitwidth of the switched-on value before promotions. We must |
| 528 | // convert the integer case values to this width before comparison. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 529 | bool HasDependentValue |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 530 | = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 531 | unsigned CondWidth |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 532 | = HasDependentValue? 0 |
Chris Lattner | 5f04881 | 2009-10-16 16:45:22 +0000 | [diff] [blame] | 533 | : static_cast<unsigned>(Context.getTypeSize(CondTypeBeforePromotion)); |
| 534 | bool CondIsSigned = CondTypeBeforePromotion->isSignedIntegerType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 535 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 536 | // Accumulate all of the case values in a vector so that we can sort them |
| 537 | // and detect duplicates. This vector contains the APInt for the case after |
| 538 | // it has been converted to the condition type. |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 539 | typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; |
| 540 | CaseValsTy CaseVals; |
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 | // 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] | 543 | typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; |
| 544 | CaseRangesTy CaseRanges; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 545 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 546 | DefaultStmt *TheDefaultStmt = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 547 | |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 548 | bool CaseListIsErroneous = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 549 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 550 | for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 551 | SC = SC->getNextSwitchCase()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 552 | |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 553 | if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 554 | if (TheDefaultStmt) { |
| 555 | Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); |
Chris Lattner | 5f4a682 | 2008-11-23 23:12:31 +0000 | [diff] [blame] | 556 | Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 557 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 558 | // FIXME: Remove the default statement from the switch block so that |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 559 | // we'll return a valid AST. This requires recursing down the AST and |
| 560 | // finding it, not something we are set up to do right now. For now, |
| 561 | // just lop the entire switch stmt out of the AST. |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 562 | CaseListIsErroneous = true; |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 563 | } |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 564 | TheDefaultStmt = DS; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 565 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 566 | } else { |
| 567 | CaseStmt *CS = cast<CaseStmt>(SC); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 568 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 569 | // We already verified that the expression has a i-c-e value (C99 |
| 570 | // 6.8.4.2p3) - get that value now. |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 571 | Expr *Lo = CS->getLHS(); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 572 | |
| 573 | if (Lo->isTypeDependent() || Lo->isValueDependent()) { |
| 574 | HasDependentValue = true; |
| 575 | break; |
| 576 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 577 | |
Anders Carlsson | 51fe996 | 2008-11-22 21:04:56 +0000 | [diff] [blame] | 578 | llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 579 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 580 | // Convert the value to the same width/sign as the condition. |
| 581 | ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 582 | Lo->getLocStart(), |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 583 | diag::warn_case_value_overflow); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 584 | |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 585 | // If the LHS is not the same type as the condition, insert an implicit |
| 586 | // cast. |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 587 | ImpCastExprToType(Lo, CondType, CK_IntegralCast); |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 588 | CS->setLHS(Lo); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 589 | |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 590 | // If this is a case range, remember it in CaseRanges, otherwise CaseVals. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 591 | if (CS->getRHS()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 592 | if (CS->getRHS()->isTypeDependent() || |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 593 | CS->getRHS()->isValueDependent()) { |
| 594 | HasDependentValue = true; |
| 595 | break; |
| 596 | } |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 597 | CaseRanges.push_back(std::make_pair(LoVal, CS)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 598 | } else |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 599 | CaseVals.push_back(std::make_pair(LoVal, CS)); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 600 | } |
| 601 | } |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 602 | |
| 603 | if (!HasDependentValue) { |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 604 | // If we don't have a default statement, check whether the |
| 605 | // condition is constant. |
| 606 | llvm::APSInt ConstantCondValue; |
| 607 | bool HasConstantCond = false; |
| 608 | bool ShouldCheckConstantCond = false; |
| 609 | if (!HasDependentValue && !TheDefaultStmt) { |
| 610 | Expr::EvalResult Result; |
| 611 | HasConstantCond = CondExprBeforePromotion->Evaluate(Result, Context); |
| 612 | if (HasConstantCond) { |
| 613 | assert(Result.Val.isInt() && "switch condition evaluated to non-int"); |
| 614 | ConstantCondValue = Result.Val.getInt(); |
| 615 | ShouldCheckConstantCond = true; |
| 616 | |
| 617 | assert(ConstantCondValue.getBitWidth() == CondWidth && |
| 618 | ConstantCondValue.isSigned() == CondIsSigned); |
| 619 | } |
| 620 | } |
| 621 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 622 | // Sort all the scalar case values so we can easily detect duplicates. |
| 623 | std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); |
| 624 | |
| 625 | if (!CaseVals.empty()) { |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 626 | for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { |
| 627 | if (ShouldCheckConstantCond && |
| 628 | CaseVals[i].first == ConstantCondValue) |
| 629 | ShouldCheckConstantCond = false; |
| 630 | |
| 631 | if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 632 | // If we have a duplicate, report it. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 633 | Diag(CaseVals[i].second->getLHS()->getLocStart(), |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 634 | diag::err_duplicate_case) << CaseVals[i].first.toString(10); |
| 635 | Diag(CaseVals[i-1].second->getLHS()->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 636 | diag::note_duplicate_case_prev); |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 637 | // FIXME: We really want to remove the bogus case stmt from the |
| 638 | // substmt, but we have no way to do this right now. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 639 | CaseListIsErroneous = true; |
| 640 | } |
| 641 | } |
| 642 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 643 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 644 | // Detect duplicate case ranges, which usually don't exist at all in |
| 645 | // the first place. |
| 646 | if (!CaseRanges.empty()) { |
| 647 | // Sort all the case ranges by their low value so we can easily detect |
| 648 | // overlaps between ranges. |
| 649 | std::stable_sort(CaseRanges.begin(), CaseRanges.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 650 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 651 | // Scan the ranges, computing the high values and removing empty ranges. |
| 652 | std::vector<llvm::APSInt> HiVals; |
| 653 | for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 654 | llvm::APSInt &LoVal = CaseRanges[i].first; |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 655 | CaseStmt *CR = CaseRanges[i].second; |
| 656 | Expr *Hi = CR->getRHS(); |
| 657 | llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 658 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 659 | // Convert the value to the same width/sign as the condition. |
| 660 | ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 661 | Hi->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 662 | diag::warn_case_value_overflow); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 663 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 664 | // If the LHS is not the same type as the condition, insert an implicit |
| 665 | // cast. |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 666 | ImpCastExprToType(Hi, CondType, CK_IntegralCast); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 667 | CR->setRHS(Hi); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 668 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 669 | // 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] | 670 | if (LoVal > HiVal) { |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 671 | Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) |
| 672 | << SourceRange(CR->getLHS()->getLocStart(), |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 673 | Hi->getLocEnd()); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 674 | CaseRanges.erase(CaseRanges.begin()+i); |
| 675 | --i, --e; |
| 676 | continue; |
| 677 | } |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 678 | |
| 679 | if (ShouldCheckConstantCond && |
| 680 | LoVal <= ConstantCondValue && |
| 681 | ConstantCondValue <= HiVal) |
| 682 | ShouldCheckConstantCond = false; |
| 683 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 684 | HiVals.push_back(HiVal); |
| 685 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 686 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 687 | // Rescan the ranges, looking for overlap with singleton values and other |
| 688 | // ranges. Since the range list is sorted, we only need to compare case |
| 689 | // ranges with their neighbors. |
| 690 | for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
| 691 | llvm::APSInt &CRLo = CaseRanges[i].first; |
| 692 | llvm::APSInt &CRHi = HiVals[i]; |
| 693 | CaseStmt *CR = CaseRanges[i].second; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 694 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 695 | // Check to see whether the case range overlaps with any |
| 696 | // singleton cases. |
| 697 | CaseStmt *OverlapStmt = 0; |
| 698 | llvm::APSInt OverlapVal(32); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 699 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 700 | // Find the smallest value >= the lower bound. If I is in the |
| 701 | // case range, then we have overlap. |
| 702 | CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), |
| 703 | CaseVals.end(), CRLo, |
| 704 | CaseCompareFunctor()); |
| 705 | if (I != CaseVals.end() && I->first < CRHi) { |
| 706 | OverlapVal = I->first; // Found overlap with scalar. |
| 707 | OverlapStmt = I->second; |
| 708 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 709 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 710 | // Find the smallest value bigger than the upper bound. |
| 711 | I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); |
| 712 | if (I != CaseVals.begin() && (I-1)->first >= CRLo) { |
| 713 | OverlapVal = (I-1)->first; // Found overlap with scalar. |
| 714 | OverlapStmt = (I-1)->second; |
| 715 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 716 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 717 | // Check to see if this case stmt overlaps with the subsequent |
| 718 | // case range. |
| 719 | if (i && CRLo <= HiVals[i-1]) { |
| 720 | OverlapVal = HiVals[i-1]; // Found overlap with range. |
| 721 | OverlapStmt = CaseRanges[i-1].second; |
| 722 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 723 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 724 | if (OverlapStmt) { |
| 725 | // If we have a duplicate, report it. |
| 726 | Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) |
| 727 | << OverlapVal.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 728 | Diag(OverlapStmt->getLHS()->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 729 | diag::note_duplicate_case_prev); |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 730 | // FIXME: We really want to remove the bogus case stmt from the |
| 731 | // substmt, but we have no way to do this right now. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 732 | CaseListIsErroneous = true; |
| 733 | } |
Chris Lattner | f334850 | 2007-08-23 14:29:07 +0000 | [diff] [blame] | 734 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 735 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 736 | |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 737 | // Complain if we have a constant condition and we didn't find a match. |
| 738 | if (!CaseListIsErroneous && ShouldCheckConstantCond) { |
| 739 | // TODO: it would be nice if we printed enums as enums, chars as |
| 740 | // chars, etc. |
| 741 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) |
| 742 | << ConstantCondValue.toString(10) |
| 743 | << CondExpr->getSourceRange(); |
| 744 | } |
| 745 | |
| 746 | // 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] | 747 | // values. We only issue a warning if there is not 'default:', but |
| 748 | // we still do the analysis to preserve this information in the AST |
| 749 | // (which can be used by flow-based analyes). |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 750 | // |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 751 | const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>(); |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 752 | |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 753 | // If switch has default case, then ignore it. |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 754 | if (!CaseListIsErroneous && !HasConstantCond && ET) { |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 755 | const EnumDecl *ED = ET->getDecl(); |
| 756 | typedef llvm::SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> EnumValsTy; |
| 757 | EnumValsTy EnumVals; |
| 758 | |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 759 | // Gather all enum values, set their type and sort them, |
| 760 | // allowing easier comparison with CaseVals. |
| 761 | for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 762 | EDI != ED->enumerator_end(); ++EDI) { |
| 763 | llvm::APSInt Val = EDI->getInitVal(); |
| 764 | AdjustAPSInt(Val, CondWidth, CondIsSigned); |
| 765 | EnumVals.push_back(std::make_pair(Val, *EDI)); |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 766 | } |
| 767 | std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 768 | EnumValsTy::iterator EIend = |
| 769 | std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 770 | |
| 771 | // See which case values aren't in enum. |
| 772 | // TODO: we might want to check whether case values are out of the |
| 773 | // enum even if we don't want to check whether all cases are handled. |
| 774 | if (!TheDefaultStmt) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 775 | EnumValsTy::const_iterator EI = EnumVals.begin(); |
| 776 | for (CaseValsTy::const_iterator CI = CaseVals.begin(); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 777 | CI != CaseVals.end(); CI++) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 778 | while (EI != EIend && EI->first < CI->first) |
| 779 | EI++; |
| 780 | if (EI == EIend || EI->first > CI->first) |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 781 | Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) |
| 782 | << ED->getDeclName(); |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 783 | } |
| 784 | // See which of case ranges aren't in enum |
| 785 | EI = EnumVals.begin(); |
| 786 | for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); |
John McCall | 0fb9708 | 2010-05-18 03:19:21 +0000 | [diff] [blame] | 787 | RI != CaseRanges.end() && EI != EIend; RI++) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 788 | while (EI != EIend && EI->first < RI->first) |
| 789 | EI++; |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 790 | |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 791 | if (EI == EIend || EI->first != RI->first) { |
| 792 | Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) |
| 793 | << ED->getDeclName(); |
| 794 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 795 | |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 796 | llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 797 | AdjustAPSInt(Hi, CondWidth, CondIsSigned); |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 798 | while (EI != EIend && EI->first < Hi) |
| 799 | EI++; |
| 800 | if (EI == EIend || EI->first != Hi) |
| 801 | Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) |
| 802 | << ED->getDeclName(); |
| 803 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 804 | } |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 805 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 806 | // Check which enum vals aren't in switch |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 807 | CaseValsTy::const_iterator CI = CaseVals.begin(); |
| 808 | CaseRangesTy::const_iterator RI = CaseRanges.begin(); |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 809 | bool hasCasesNotInSwitch = false; |
| 810 | |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 811 | llvm::SmallVector<DeclarationName,8> UnhandledNames; |
| 812 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 813 | for (EnumValsTy::const_iterator EI = EnumVals.begin(); EI != EIend; EI++){ |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 814 | // Drop unneeded case values |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 815 | llvm::APSInt CIVal; |
| 816 | while (CI != CaseVals.end() && CI->first < EI->first) |
| 817 | CI++; |
| 818 | |
| 819 | if (CI != CaseVals.end() && CI->first == EI->first) |
| 820 | continue; |
| 821 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 822 | // Drop unneeded case ranges |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 823 | for (; RI != CaseRanges.end(); RI++) { |
| 824 | llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); |
Gabor Greif | 28164ab | 2010-10-01 22:05:14 +0000 | [diff] [blame] | 825 | AdjustAPSInt(Hi, CondWidth, CondIsSigned); |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 826 | if (EI->first <= Hi) |
| 827 | break; |
| 828 | } |
| 829 | |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 830 | if (RI == CaseRanges.end() || EI->first < RI->first) { |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 831 | hasCasesNotInSwitch = true; |
| 832 | if (!TheDefaultStmt) |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 833 | UnhandledNames.push_back(EI->second->getDeclName()); |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 834 | } |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 835 | } |
Chris Lattner | ce78461 | 2010-09-16 17:09:42 +0000 | [diff] [blame] | 836 | |
| 837 | // Produce a nice diagnostic if multiple values aren't handled. |
| 838 | switch (UnhandledNames.size()) { |
| 839 | case 0: break; |
| 840 | case 1: |
| 841 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case1) |
| 842 | << UnhandledNames[0]; |
| 843 | break; |
| 844 | case 2: |
| 845 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case2) |
| 846 | << UnhandledNames[0] << UnhandledNames[1]; |
| 847 | break; |
| 848 | case 3: |
| 849 | Diag(CondExpr->getExprLoc(), diag::warn_missing_case3) |
| 850 | << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; |
| 851 | break; |
| 852 | default: |
| 853 | Diag(CondExpr->getExprLoc(), diag::warn_missing_cases) |
| 854 | << (unsigned)UnhandledNames.size() |
| 855 | << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; |
| 856 | break; |
| 857 | } |
Ted Kremenek | 559fb55 | 2010-09-09 00:05:53 +0000 | [diff] [blame] | 858 | |
| 859 | if (!hasCasesNotInSwitch) |
Ted Kremenek | 47bb27f | 2010-09-09 06:53:59 +0000 | [diff] [blame] | 860 | SS->setAllEnumCasesCovered(); |
Douglas Gregor | ba915af | 2010-02-08 22:24:16 +0000 | [diff] [blame] | 861 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 862 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 863 | |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 864 | // FIXME: If the case list was broken is some way, we don't have a good system |
| 865 | // to patch it up. Instead, just return the whole substmt as broken. |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 866 | if (CaseListIsErroneous) |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 867 | return StmtError(); |
| 868 | |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 869 | return Owned(SS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 870 | } |
| 871 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 872 | StmtResult |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 873 | Sema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 874 | Decl *CondVar, Stmt *Body) { |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 875 | ExprResult CondResult(Cond.release()); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 876 | |
Douglas Gregor | 5656e14 | 2009-11-24 21:15:44 +0000 | [diff] [blame] | 877 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 878 | if (CondVar) { |
| 879 | ConditionVar = cast<VarDecl>(CondVar); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 880 | CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 881 | if (CondResult.isInvalid()) |
| 882 | return StmtError(); |
Douglas Gregor | 5656e14 | 2009-11-24 21:15:44 +0000 | [diff] [blame] | 883 | } |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 884 | Expr *ConditionExpr = CondResult.take(); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 885 | if (!ConditionExpr) |
| 886 | return StmtError(); |
| 887 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 888 | DiagnoseUnusedExprResult(Body); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 889 | |
Douglas Gregor | 43dec6b | 2010-06-21 23:44:13 +0000 | [diff] [blame] | 890 | return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 891 | Body, WhileLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 892 | } |
| 893 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 894 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 895 | Sema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, |
Chris Lattner | 9891359 | 2009-06-12 23:04:47 +0000 | [diff] [blame] | 896 | SourceLocation WhileLoc, SourceLocation CondLParen, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 897 | Expr *Cond, SourceLocation CondRParen) { |
| 898 | assert(Cond && "ActOnDoStmt(): missing expression"); |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 899 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 900 | if (CheckBooleanCondition(Cond, DoLoc)) |
John McCall | 5a881bb | 2009-10-12 21:59:07 +0000 | [diff] [blame] | 901 | return StmtError(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 902 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 903 | CheckImplicitConversions(Cond, DoLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 904 | ExprResult CondResult = MaybeCreateExprWithCleanups(Cond); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 905 | if (CondResult.isInvalid()) |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 906 | return StmtError(); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 907 | Cond = CondResult.take(); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 908 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 909 | DiagnoseUnusedExprResult(Body); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 910 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 911 | return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 912 | } |
| 913 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 914 | StmtResult |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 915 | Sema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 916 | Stmt *First, FullExprArg second, Decl *secondVar, |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 917 | FullExprArg third, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 918 | SourceLocation RParenLoc, Stmt *Body) { |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 919 | if (!getLangOptions().CPlusPlus) { |
| 920 | if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { |
Chris Lattner | f3a41af | 2008-11-20 06:38:18 +0000 | [diff] [blame] | 921 | // C99 6.8.5p3: The declaration part of a 'for' statement shall only |
| 922 | // declare identifiers for objects having storage class 'auto' or |
| 923 | // 'register'. |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 924 | for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); |
| 925 | DI!=DE; ++DI) { |
| 926 | VarDecl *VD = dyn_cast<VarDecl>(*DI); |
John McCall | b6bbcc9 | 2010-10-15 04:57:14 +0000 | [diff] [blame] | 927 | if (VD && VD->isLocalVarDecl() && !VD->hasLocalStorage()) |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 928 | VD = 0; |
| 929 | if (VD == 0) |
| 930 | Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); |
| 931 | // FIXME: mark decl erroneous! |
| 932 | } |
Chris Lattner | ae3b701 | 2007-08-28 05:03:08 +0000 | [diff] [blame] | 933 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 934 | } |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 935 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 936 | ExprResult SecondResult(second.release()); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 937 | VarDecl *ConditionVar = 0; |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 938 | if (secondVar) { |
| 939 | ConditionVar = cast<VarDecl>(secondVar); |
Douglas Gregor | 586596f | 2010-05-06 17:25:47 +0000 | [diff] [blame] | 940 | SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 941 | if (SecondResult.isInvalid()) |
| 942 | return StmtError(); |
| 943 | } |
| 944 | |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 945 | Expr *Third = third.release().takeAs<Expr>(); |
Douglas Gregor | 99e9b4d | 2009-11-25 00:27:52 +0000 | [diff] [blame] | 946 | |
Anders Carlsson | 3af708f | 2009-08-01 01:39:59 +0000 | [diff] [blame] | 947 | DiagnoseUnusedExprResult(First); |
| 948 | DiagnoseUnusedExprResult(Third); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 949 | DiagnoseUnusedExprResult(Body); |
| 950 | |
Douglas Gregor | 43dec6b | 2010-06-21 23:44:13 +0000 | [diff] [blame] | 951 | return Owned(new (Context) ForStmt(Context, First, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 952 | SecondResult.take(), ConditionVar, |
Douglas Gregor | 43dec6b | 2010-06-21 23:44:13 +0000 | [diff] [blame] | 953 | Third, Body, ForLoc, LParenLoc, |
| 954 | RParenLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 955 | } |
| 956 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 957 | /// In an Objective C collection iteration statement: |
| 958 | /// for (x in y) |
| 959 | /// x can be an arbitrary l-value expression. Bind it up as a |
| 960 | /// full-expression. |
| 961 | StmtResult Sema::ActOnForEachLValueExpr(Expr *E) { |
| 962 | CheckImplicitConversions(E); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 963 | ExprResult Result = MaybeCreateExprWithCleanups(E); |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 964 | if (Result.isInvalid()) return StmtError(); |
| 965 | return Owned(static_cast<Stmt*>(Result.get())); |
| 966 | } |
| 967 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 968 | StmtResult |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 969 | Sema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, |
| 970 | SourceLocation LParenLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 971 | Stmt *First, Expr *Second, |
| 972 | SourceLocation RParenLoc, Stmt *Body) { |
Fariborz Jahanian | 20552d2 | 2008-01-10 20:33:58 +0000 | [diff] [blame] | 973 | if (First) { |
| 974 | QualType FirstType; |
| 975 | if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { |
Chris Lattner | 7e24e82 | 2009-03-28 06:33:19 +0000 | [diff] [blame] | 976 | if (!DS->isSingleDecl()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 977 | return StmtError(Diag((*DS->decl_begin())->getLocation(), |
| 978 | diag::err_toomany_element_decls)); |
| 979 | |
Chris Lattner | 7e24e82 | 2009-03-28 06:33:19 +0000 | [diff] [blame] | 980 | Decl *D = DS->getSingleDecl(); |
Ted Kremenek | f34afee | 2008-10-06 20:58:11 +0000 | [diff] [blame] | 981 | FirstType = cast<ValueDecl>(D)->getType(); |
Chris Lattner | f3a41af | 2008-11-20 06:38:18 +0000 | [diff] [blame] | 982 | // C99 6.8.5p3: The declaration part of a 'for' statement shall only |
| 983 | // declare identifiers for objects having storage class 'auto' or |
| 984 | // 'register'. |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 985 | VarDecl *VD = cast<VarDecl>(D); |
John McCall | b6bbcc9 | 2010-10-15 04:57:14 +0000 | [diff] [blame] | 986 | if (VD->isLocalVarDecl() && !VD->hasLocalStorage()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 987 | return StmtError(Diag(VD->getLocation(), |
| 988 | diag::err_non_variable_decl_in_for)); |
Anders Carlsson | 1fe379f | 2008-08-25 18:16:36 +0000 | [diff] [blame] | 989 | } else { |
Douglas Gregor | c3203e7 | 2010-04-22 23:10:45 +0000 | [diff] [blame] | 990 | Expr *FirstE = cast<Expr>(First); |
John McCall | 7eb0a9e | 2010-11-24 05:12:34 +0000 | [diff] [blame] | 991 | if (!FirstE->isTypeDependent() && !FirstE->isLValue()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 992 | return StmtError(Diag(First->getLocStart(), |
| 993 | diag::err_selector_element_not_lvalue) |
| 994 | << First->getSourceRange()); |
| 995 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 996 | FirstType = static_cast<Expr*>(First)->getType(); |
Anders Carlsson | 1fe379f | 2008-08-25 18:16:36 +0000 | [diff] [blame] | 997 | } |
Douglas Gregor | c3203e7 | 2010-04-22 23:10:45 +0000 | [diff] [blame] | 998 | if (!FirstType->isDependentType() && |
| 999 | !FirstType->isObjCObjectPointerType() && |
Fariborz Jahanian | a5e42a8 | 2009-08-14 21:53:27 +0000 | [diff] [blame] | 1000 | !FirstType->isBlockPointerType()) |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 1001 | Diag(ForLoc, diag::err_selector_element_type) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 1002 | << FirstType << First->getSourceRange(); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1003 | } |
Douglas Gregor | c3203e7 | 2010-04-22 23:10:45 +0000 | [diff] [blame] | 1004 | if (Second && !Second->isTypeDependent()) { |
Douglas Gregor | a873dfc | 2010-02-03 00:27:59 +0000 | [diff] [blame] | 1005 | DefaultFunctionArrayLvalueConversion(Second); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1006 | QualType SecondType = Second->getType(); |
Steve Naroff | f495456 | 2009-07-16 15:41:00 +0000 | [diff] [blame] | 1007 | if (!SecondType->isObjCObjectPointerType()) |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 1008 | Diag(ForLoc, diag::err_collection_expr_type) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 1009 | << SecondType << Second->getSourceRange(); |
Fariborz Jahanian | ea16110 | 2010-08-12 22:25:42 +0000 | [diff] [blame] | 1010 | else if (const ObjCObjectPointerType *OPT = |
| 1011 | SecondType->getAsObjCInterfacePointerType()) { |
| 1012 | llvm::SmallVector<IdentifierInfo *, 4> KeyIdents; |
| 1013 | IdentifierInfo* selIdent = |
| 1014 | &Context.Idents.get("countByEnumeratingWithState"); |
| 1015 | KeyIdents.push_back(selIdent); |
| 1016 | selIdent = &Context.Idents.get("objects"); |
| 1017 | KeyIdents.push_back(selIdent); |
| 1018 | selIdent = &Context.Idents.get("count"); |
| 1019 | KeyIdents.push_back(selIdent); |
| 1020 | Selector CSelector = Context.Selectors.getSelector(3, &KeyIdents[0]); |
| 1021 | if (ObjCInterfaceDecl *IDecl = OPT->getInterfaceDecl()) { |
| 1022 | if (!IDecl->isForwardDecl() && |
| 1023 | !IDecl->lookupInstanceMethod(CSelector)) { |
Fariborz Jahanian | 80a785c | 2010-08-12 22:33:42 +0000 | [diff] [blame] | 1024 | // Must further look into private implementation methods. |
Fariborz Jahanian | ea16110 | 2010-08-12 22:25:42 +0000 | [diff] [blame] | 1025 | if (!LookupPrivateInstanceMethod(CSelector, IDecl)) |
| 1026 | Diag(ForLoc, diag::warn_collection_expr_type) |
| 1027 | << SecondType << CSelector << Second->getSourceRange(); |
| 1028 | } |
| 1029 | } |
| 1030 | } |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1031 | } |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1032 | return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, |
| 1033 | ForLoc, RParenLoc)); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 1034 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1035 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1036 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 1037 | Sema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1038 | IdentifierInfo *LabelII) { |
| 1039 | // Look up the record for this label identifier. |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1040 | LabelStmt *&LabelDecl = getCurFunction()->LabelMap[LabelII]; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1041 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1042 | getCurFunction()->setHasBranchIntoScope(); |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 1043 | |
Steve Naroff | caaacec | 2009-03-13 15:38:40 +0000 | [diff] [blame] | 1044 | // If we haven't seen this label yet, create a forward reference. |
| 1045 | if (LabelDecl == 0) |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1046 | LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1047 | |
Argyrios Kyrtzidis | 355a9fe | 2010-09-19 21:21:25 +0000 | [diff] [blame] | 1048 | LabelDecl->setUsed(); |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1049 | return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1050 | } |
| 1051 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1052 | StmtResult |
Chris Lattner | ad56d68 | 2009-04-19 01:04:21 +0000 | [diff] [blame] | 1053 | Sema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1054 | Expr *E) { |
Eli Friedman | bbf4623 | 2009-03-26 00:18:06 +0000 | [diff] [blame] | 1055 | // Convert operand to void* |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1056 | if (!E->isTypeDependent()) { |
| 1057 | QualType ETy = E->getType(); |
Chandler Carruth | 2877998 | 2010-01-31 10:26:25 +0000 | [diff] [blame] | 1058 | QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1059 | AssignConvertType ConvTy = |
Chandler Carruth | 2877998 | 2010-01-31 10:26:25 +0000 | [diff] [blame] | 1060 | CheckSingleAssignmentConstraints(DestTy, E); |
| 1061 | if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1062 | return StmtError(); |
| 1063 | } |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 1064 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1065 | getCurFunction()->setHasIndirectGoto(); |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 1066 | |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 1067 | return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1068 | } |
| 1069 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1070 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 1071 | Sema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1072 | Scope *S = CurScope->getContinueParent(); |
| 1073 | if (!S) { |
| 1074 | // 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] | 1075 | return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1076 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1077 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1078 | return Owned(new (Context) ContinueStmt(ContinueLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1079 | } |
| 1080 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1081 | StmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 1082 | Sema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1083 | Scope *S = CurScope->getBreakParent(); |
| 1084 | if (!S) { |
| 1085 | // 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] | 1086 | return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1087 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1088 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1089 | return Owned(new (Context) BreakStmt(BreakLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1090 | } |
| 1091 | |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1092 | /// \brief Determine whether the given expression is a candidate for |
| 1093 | /// copy elision in either a return statement or a throw expression. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1094 | /// |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1095 | /// \param ReturnType If we're determining the copy elision candidate for |
| 1096 | /// a return statement, this is the return type of the function. If we're |
| 1097 | /// determining the copy elision candidate for a throw expression, this will |
| 1098 | /// be a NULL type. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1099 | /// |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1100 | /// \param E The expression being returned from the function or block, or |
| 1101 | /// being thrown. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1102 | /// |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1103 | /// \param AllowFunctionParameter |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1104 | /// |
| 1105 | /// \returns The NRVO candidate variable, if the return statement may use the |
| 1106 | /// NRVO, or NULL if there is no such candidate. |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1107 | const VarDecl *Sema::getCopyElisionCandidate(QualType ReturnType, |
| 1108 | Expr *E, |
| 1109 | bool AllowFunctionParameter) { |
| 1110 | QualType ExprType = E->getType(); |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1111 | // - in a return statement in a function with ... |
| 1112 | // ... a class return type ... |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1113 | if (!ReturnType.isNull()) { |
| 1114 | if (!ReturnType->isRecordType()) |
| 1115 | return 0; |
| 1116 | // ... the same cv-unqualified type as the function return type ... |
| 1117 | if (!Context.hasSameUnqualifiedType(ReturnType, ExprType)) |
| 1118 | return 0; |
| 1119 | } |
| 1120 | |
| 1121 | // ... the expression is the name of a non-volatile automatic object |
| 1122 | // (other than a function or catch-clause parameter)) ... |
| 1123 | const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E->IgnoreParens()); |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1124 | if (!DR) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1125 | return 0; |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1126 | const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); |
| 1127 | if (!VD) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1128 | return 0; |
| 1129 | |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1130 | if (VD->hasLocalStorage() && !VD->isExceptionVariable() && |
Douglas Gregor | d86c477 | 2010-05-15 06:46:45 +0000 | [diff] [blame] | 1131 | !VD->getType()->isReferenceType() && !VD->hasAttr<BlocksAttr>() && |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1132 | !VD->getType().isVolatileQualified() && |
Douglas Gregor | 4a46c77 | 2011-01-21 18:20:49 +0000 | [diff] [blame] | 1133 | ((VD->getKind() == Decl::Var) || |
| 1134 | (AllowFunctionParameter && VD->getKind() == Decl::ParmVar))) |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1135 | return VD; |
| 1136 | |
| 1137 | return 0; |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 1138 | } |
| 1139 | |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1140 | /// \brief Perform the initialization of a potentially-movable value, which |
| 1141 | /// is the result of return value. |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1142 | /// |
| 1143 | /// This routine implements C++0x [class.copy]p33, which attempts to treat |
| 1144 | /// returned lvalues as rvalues in certain cases (to prefer move construction), |
| 1145 | /// then falls back to treating them as lvalues if that failed. |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1146 | ExprResult |
| 1147 | Sema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity, |
| 1148 | const VarDecl *NRVOCandidate, |
| 1149 | QualType ResultType, |
| 1150 | Expr *Value) { |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1151 | // C++0x [class.copy]p33: |
| 1152 | // When the criteria for elision of a copy operation are met or would |
| 1153 | // be met save for the fact that the source object is a function |
| 1154 | // parameter, and the object to be copied is designated by an lvalue, |
| 1155 | // overload resolution to select the constructor for the copy is first |
| 1156 | // performed as if the object were designated by an rvalue. |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1157 | ExprResult Res = ExprError(); |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1158 | if (NRVOCandidate || getCopyElisionCandidate(ResultType, Value, true)) { |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1159 | ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1160 | Value->getType(), CK_LValueToRValue, |
| 1161 | Value, VK_XValue); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1162 | |
| 1163 | Expr *InitExpr = &AsRvalue; |
| 1164 | InitializationKind Kind |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1165 | = InitializationKind::CreateCopy(Value->getLocStart(), |
| 1166 | Value->getLocStart()); |
| 1167 | InitializationSequence Seq(*this, Entity, Kind, &InitExpr, 1); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1168 | |
| 1169 | // [...] If overload resolution fails, or if the type of the first |
| 1170 | // parameter of the selected constructor is not an rvalue reference |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame^] | 1171 | // to the object's type (possibly cv-qualified), overload resolution |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1172 | // is performed again, considering the object as an lvalue. |
| 1173 | if (Seq.getKind() != InitializationSequence::FailedSequence) { |
| 1174 | for (InitializationSequence::step_iterator Step = Seq.step_begin(), |
| 1175 | StepEnd = Seq.step_end(); |
| 1176 | Step != StepEnd; ++Step) { |
| 1177 | if (Step->Kind |
| 1178 | != InitializationSequence::SK_ConstructorInitialization) |
| 1179 | continue; |
| 1180 | |
| 1181 | CXXConstructorDecl *Constructor |
| 1182 | = cast<CXXConstructorDecl>(Step->Function.Function); |
| 1183 | |
| 1184 | const RValueReferenceType *RRefType |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1185 | = Constructor->getParamDecl(0)->getType() |
| 1186 | ->getAs<RValueReferenceType>(); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1187 | |
| 1188 | // If we don't meet the criteria, break out now. |
| 1189 | if (!RRefType || |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1190 | !Context.hasSameUnqualifiedType(RRefType->getPointeeType(), |
| 1191 | Context.getTypeDeclType(Constructor->getParent()))) |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1192 | break; |
| 1193 | |
| 1194 | // Promote "AsRvalue" to the heap, since we now need this |
| 1195 | // expression node to persist. |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1196 | Value = ImplicitCastExpr::Create(Context, Value->getType(), |
| 1197 | CK_LValueToRValue, Value, 0, |
| 1198 | VK_XValue); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1199 | |
| 1200 | // Complete type-checking the initialization of the return type |
| 1201 | // using the constructor we found. |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1202 | Res = Seq.Perform(*this, Entity, Kind, MultiExprArg(&Value, 1)); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1203 | } |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | // Either we didn't meet the criteria for treating an lvalue as an rvalue, |
| 1208 | // above, or overload resolution failed. Either way, we need to try |
| 1209 | // (again) now with the return value expression as written. |
| 1210 | if (Res.isInvalid()) |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1211 | Res = PerformCopyInitialization(Entity, SourceLocation(), Value); |
Douglas Gregor | cc15f01 | 2011-01-21 19:38:21 +0000 | [diff] [blame] | 1212 | |
| 1213 | return Res; |
| 1214 | } |
| 1215 | |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1216 | /// ActOnBlockReturnStmt - Utility routine to figure out block's return type. |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1217 | /// |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1218 | StmtResult |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1219 | Sema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1220 | // If this is the first return we've seen in the block, infer the type of |
| 1221 | // the block from it. |
Douglas Gregor | 9ea9bdb | 2010-03-01 23:15:13 +0000 | [diff] [blame] | 1222 | BlockScopeInfo *CurBlock = getCurBlock(); |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1223 | if (CurBlock->ReturnType.isNull()) { |
Steve Naroff | c50a4a5 | 2008-09-16 22:25:10 +0000 | [diff] [blame] | 1224 | if (RetValExp) { |
Steve Naroff | 1656442 | 2008-09-24 22:26:48 +0000 | [diff] [blame] | 1225 | // Don't call UsualUnaryConversions(), since we don't want to do |
| 1226 | // integer promotions here. |
Douglas Gregor | a873dfc | 2010-02-03 00:27:59 +0000 | [diff] [blame] | 1227 | DefaultFunctionArrayLvalueConversion(RetValExp); |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1228 | CurBlock->ReturnType = RetValExp->getType(); |
| 1229 | if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { |
| 1230 | // We have to remove a 'const' added to copied-in variable which was |
| 1231 | // part of the implementation spec. and not the actual qualifier for |
| 1232 | // the variable. |
| 1233 | if (CDRE->isConstQualAdded()) |
John McCall | 49f4e1c | 2010-12-10 11:01:00 +0000 | [diff] [blame] | 1234 | CurBlock->ReturnType.removeLocalConst(); // FIXME: local??? |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1235 | } |
Steve Naroff | c50a4a5 | 2008-09-16 22:25:10 +0000 | [diff] [blame] | 1236 | } else |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1237 | CurBlock->ReturnType = Context.VoidTy; |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1238 | } |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 1239 | QualType FnRetType = CurBlock->ReturnType; |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1240 | |
John McCall | 711c52b | 2011-01-05 12:14:39 +0000 | [diff] [blame] | 1241 | if (CurBlock->FunctionType->getAs<FunctionType>()->getNoReturnAttr()) { |
Mike Stump | 6c92fa7 | 2009-04-29 21:40:37 +0000 | [diff] [blame] | 1242 | Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) |
| 1243 | << getCurFunctionOrMethodDecl()->getDeclName(); |
| 1244 | return StmtError(); |
| 1245 | } |
| 1246 | |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1247 | // Otherwise, verify that this result type matches the previous one. We are |
| 1248 | // pickier with blocks than for normal functions because we don't have GCC |
| 1249 | // compatibility to worry about here. |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1250 | ReturnStmt *Result = 0; |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1251 | if (CurBlock->ReturnType->isVoidType()) { |
| 1252 | if (RetValExp) { |
| 1253 | Diag(ReturnLoc, diag::err_return_block_has_expr); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1254 | RetValExp = 0; |
| 1255 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1256 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); |
| 1257 | } else if (!RetValExp) { |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1258 | return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1259 | } else { |
| 1260 | const VarDecl *NRVOCandidate = 0; |
| 1261 | |
| 1262 | if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { |
| 1263 | // we have a non-void block with an expression, continue checking |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1264 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1265 | // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| 1266 | // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
| 1267 | // function return. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1268 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1269 | // In C++ the return statement is handled via a copy initialization. |
| 1270 | // the C version of which boils down to CheckSingleAssignmentConstraints. |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1271 | NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1272 | InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, |
| 1273 | FnRetType, |
| 1274 | NRVOCandidate != 0); |
| 1275 | ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, |
| 1276 | FnRetType, RetValExp); |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1277 | if (Res.isInvalid()) { |
| 1278 | // FIXME: Cleanup temporaries here, anyway? |
| 1279 | return StmtError(); |
| 1280 | } |
| 1281 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1282 | if (RetValExp) { |
| 1283 | CheckImplicitConversions(RetValExp, ReturnLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1284 | RetValExp = MaybeCreateExprWithCleanups(RetValExp); |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1285 | } |
Mike Stump | 98eb8a7 | 2009-02-04 22:31:32 +0000 | [diff] [blame] | 1286 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1287 | RetValExp = Res.takeAs<Expr>(); |
| 1288 | if (RetValExp) |
| 1289 | CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
Anders Carlsson | c6acbc5 | 2010-01-29 18:30:20 +0000 | [diff] [blame] | 1290 | } |
| 1291 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1292 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1293 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1294 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1295 | // If we need to check for the named return value optimization, save the |
| 1296 | // return statement in our scope for later processing. |
| 1297 | if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && |
| 1298 | !CurContext->isDependentContext()) |
| 1299 | FunctionScopes.back()->Returns.push_back(Result); |
| 1300 | |
| 1301 | return Owned(Result); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1302 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1303 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1304 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1305 | Sema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { |
Douglas Gregor | 9ea9bdb | 2010-03-01 23:15:13 +0000 | [diff] [blame] | 1306 | if (getCurBlock()) |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 1307 | return ActOnBlockReturnStmt(ReturnLoc, RetValExp); |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1308 | |
Chris Lattner | 371f258 | 2008-12-04 23:50:19 +0000 | [diff] [blame] | 1309 | QualType FnRetType; |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 1310 | if (const FunctionDecl *FD = getCurFunctionDecl()) { |
Chris Lattner | 371f258 | 2008-12-04 23:50:19 +0000 | [diff] [blame] | 1311 | FnRetType = FD->getResultType(); |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 1312 | if (FD->hasAttr<NoReturnAttr>() || |
| 1313 | FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) |
Chris Lattner | 8662587 | 2009-05-31 19:32:13 +0000 | [diff] [blame] | 1314 | Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 1315 | << getCurFunctionOrMethodDecl()->getDeclName(); |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 1316 | } else if (ObjCMethodDecl *MD = getCurMethodDecl()) |
Steve Naroff | c97fb9a | 2009-03-03 00:45:38 +0000 | [diff] [blame] | 1317 | FnRetType = MD->getResultType(); |
| 1318 | else // If we don't have a function/method context, bail. |
| 1319 | return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1320 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1321 | ReturnStmt *Result = 0; |
Chris Lattner | 5cf216b | 2008-01-04 18:04:52 +0000 | [diff] [blame] | 1322 | if (FnRetType->isVoidType()) { |
Douglas Gregor | 1be8aee | 2009-10-01 23:25:31 +0000 | [diff] [blame] | 1323 | if (RetValExp && !RetValExp->isTypeDependent()) { |
| 1324 | // C99 6.8.6.4p1 (ext_ since GCC warns) |
Chris Lattner | 65ce04b | 2008-12-18 02:01:17 +0000 | [diff] [blame] | 1325 | unsigned D = diag::ext_return_has_expr; |
| 1326 | if (RetValExp->getType()->isVoidType()) |
| 1327 | D = diag::ext_return_has_void_expr; |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 1328 | else { |
| 1329 | IgnoredValueConversions(RetValExp); |
| 1330 | ImpCastExprToType(RetValExp, Context.VoidTy, CK_ToVoid); |
| 1331 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1332 | |
Chris Lattner | e878eb0 | 2008-12-18 02:03:48 +0000 | [diff] [blame] | 1333 | // return (some void expression); is legal in C++. |
| 1334 | if (D != diag::ext_return_has_void_expr || |
| 1335 | !getLangOptions().CPlusPlus) { |
| 1336 | NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); |
| 1337 | Diag(ReturnLoc, D) |
| 1338 | << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) |
| 1339 | << RetValExp->getSourceRange(); |
| 1340 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1341 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1342 | CheckImplicitConversions(RetValExp, ReturnLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1343 | RetValExp = MaybeCreateExprWithCleanups(RetValExp); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1344 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1345 | |
| 1346 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); |
| 1347 | } else if (!RetValExp && !FnRetType->isDependentType()) { |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 1348 | unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 |
| 1349 | // C99 6.8.6.4p1 (ext_ since GCC warns) |
| 1350 | if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; |
| 1351 | |
| 1352 | if (FunctionDecl *FD = getCurFunctionDecl()) |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 1353 | Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 1354 | else |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 1355 | Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1356 | Result = new (Context) ReturnStmt(ReturnLoc); |
| 1357 | } else { |
| 1358 | const VarDecl *NRVOCandidate = 0; |
| 1359 | if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { |
| 1360 | // we have a non-void function with an expression, continue checking |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1361 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1362 | // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| 1363 | // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
| 1364 | // function return. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1365 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1366 | // In C++ the return statement is handled via a copy initialization. |
| 1367 | // the C version of which boils down to CheckSingleAssignmentConstraints. |
Douglas Gregor | f5d8f46 | 2011-01-21 18:05:27 +0000 | [diff] [blame] | 1368 | NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); |
Douglas Gregor | 07f402c | 2011-01-21 21:08:57 +0000 | [diff] [blame] | 1369 | InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, |
| 1370 | FnRetType, |
| 1371 | NRVOCandidate != 0); |
| 1372 | ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, |
| 1373 | FnRetType, RetValExp); |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1374 | if (Res.isInvalid()) { |
| 1375 | // FIXME: Cleanup temporaries here, anyway? |
| 1376 | return StmtError(); |
| 1377 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 1378 | |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1379 | RetValExp = Res.takeAs<Expr>(); |
| 1380 | if (RetValExp) |
| 1381 | CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
Douglas Gregor | 66724ea | 2009-11-14 01:20:54 +0000 | [diff] [blame] | 1382 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1383 | |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1384 | if (RetValExp) { |
| 1385 | CheckImplicitConversions(RetValExp, ReturnLoc); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1386 | RetValExp = MaybeCreateExprWithCleanups(RetValExp); |
John McCall | b4eb64d | 2010-10-08 02:01:28 +0000 | [diff] [blame] | 1387 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1388 | Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); |
Douglas Gregor | 898574e | 2008-12-05 23:32:09 +0000 | [diff] [blame] | 1389 | } |
Douglas Gregor | 5077c38 | 2010-05-15 06:01:05 +0000 | [diff] [blame] | 1390 | |
| 1391 | // If we need to check for the named return value optimization, save the |
| 1392 | // return statement in our scope for later processing. |
| 1393 | if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && |
| 1394 | !CurContext->isDependentContext()) |
| 1395 | FunctionScopes.back()->Returns.push_back(Result); |
| 1396 | |
| 1397 | return Owned(Result); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1398 | } |
| 1399 | |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1400 | /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently |
| 1401 | /// ignore "noop" casts in places where an lvalue is required by an inline asm. |
| 1402 | /// We emulate this behavior when -fheinous-gnu-extensions is specified, but |
| 1403 | /// provide a strong guidance to not use it. |
| 1404 | /// |
| 1405 | /// This method checks to see if the argument is an acceptable l-value and |
| 1406 | /// returns false if it is a case we can handle. |
| 1407 | static bool CheckAsmLValue(const Expr *E, Sema &S) { |
Anders Carlsson | 703e394 | 2010-01-24 05:50:09 +0000 | [diff] [blame] | 1408 | // Type dependent expressions will be checked during instantiation. |
| 1409 | if (E->isTypeDependent()) |
| 1410 | return false; |
| 1411 | |
John McCall | 7eb0a9e | 2010-11-24 05:12:34 +0000 | [diff] [blame] | 1412 | if (E->isLValue()) |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1413 | return false; // Cool, this is an lvalue. |
| 1414 | |
| 1415 | // Okay, this is not an lvalue, but perhaps it is the result of a cast that we |
| 1416 | // are supposed to allow. |
| 1417 | const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); |
John McCall | 7eb0a9e | 2010-11-24 05:12:34 +0000 | [diff] [blame] | 1418 | if (E != E2 && E2->isLValue()) { |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1419 | if (!S.getLangOptions().HeinousExtensions) |
| 1420 | S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) |
| 1421 | << E->getSourceRange(); |
| 1422 | else |
| 1423 | S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) |
| 1424 | << E->getSourceRange(); |
| 1425 | // Accept, even if we emitted an error diagnostic. |
| 1426 | return false; |
| 1427 | } |
| 1428 | |
| 1429 | // None of the above, just randomly invalid non-lvalue. |
| 1430 | return true; |
| 1431 | } |
| 1432 | |
| 1433 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1434 | StmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1435 | bool IsSimple, |
| 1436 | bool IsVolatile, |
| 1437 | unsigned NumOutputs, |
| 1438 | unsigned NumInputs, |
Anders Carlsson | ff93dbd | 2010-01-30 22:25:16 +0000 | [diff] [blame] | 1439 | IdentifierInfo **Names, |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1440 | MultiExprArg constraints, |
| 1441 | MultiExprArg exprs, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1442 | Expr *asmString, |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1443 | MultiExprArg clobbers, |
Mike Stump | 3b11fd3 | 2010-01-04 22:37:17 +0000 | [diff] [blame] | 1444 | SourceLocation RParenLoc, |
| 1445 | bool MSAsm) { |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1446 | unsigned NumClobbers = clobbers.size(); |
| 1447 | StringLiteral **Constraints = |
| 1448 | reinterpret_cast<StringLiteral**>(constraints.get()); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1449 | Expr **Exprs = exprs.get(); |
| 1450 | StringLiteral *AsmString = cast<StringLiteral>(asmString); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1451 | StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); |
| 1452 | |
Anders Carlsson | 03eb543 | 2009-01-27 20:38:24 +0000 | [diff] [blame] | 1453 | llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1454 | |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1455 | // The parser verifies that there is a string literal here. |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1456 | if (AsmString->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1457 | return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) |
| 1458 | << AsmString->getSourceRange()); |
| 1459 | |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1460 | for (unsigned i = 0; i != NumOutputs; i++) { |
| 1461 | StringLiteral *Literal = Constraints[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1462 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1463 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1464 | << Literal->getSourceRange()); |
| 1465 | |
Anders Carlsson | ff93dbd | 2010-01-30 22:25:16 +0000 | [diff] [blame] | 1466 | llvm::StringRef OutputName; |
| 1467 | if (Names[i]) |
| 1468 | OutputName = Names[i]->getName(); |
| 1469 | |
| 1470 | TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1471 | if (!Context.Target.validateOutputConstraint(Info)) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1472 | return StmtError(Diag(Literal->getLocStart(), |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1473 | diag::err_asm_invalid_output_constraint) |
| 1474 | << Info.getConstraintStr()); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1475 | |
Anders Carlsson | d04c6e2 | 2007-11-27 04:11:28 +0000 | [diff] [blame] | 1476 | // Check that the output exprs are valid lvalues. |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1477 | Expr *OutputExpr = Exprs[i]; |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1478 | if (CheckAsmLValue(OutputExpr, *this)) { |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1479 | return StmtError(Diag(OutputExpr->getLocStart(), |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 1480 | diag::err_asm_invalid_lvalue_in_output) |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1481 | << OutputExpr->getSourceRange()); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1482 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1483 | |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1484 | OutputConstraintInfos.push_back(Info); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1485 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1486 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1487 | llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; |
| 1488 | |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1489 | for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1490 | StringLiteral *Literal = Constraints[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1491 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1492 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1493 | << Literal->getSourceRange()); |
| 1494 | |
Anders Carlsson | ff93dbd | 2010-01-30 22:25:16 +0000 | [diff] [blame] | 1495 | llvm::StringRef InputName; |
| 1496 | if (Names[i]) |
| 1497 | InputName = Names[i]->getName(); |
| 1498 | |
| 1499 | TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); |
Jay Foad | beaaccd | 2009-05-21 09:52:38 +0000 | [diff] [blame] | 1500 | if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), |
Chris Lattner | 2819fa8 | 2009-04-26 17:57:12 +0000 | [diff] [blame] | 1501 | NumOutputs, Info)) { |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1502 | return StmtError(Diag(Literal->getLocStart(), |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1503 | diag::err_asm_invalid_input_constraint) |
| 1504 | << Info.getConstraintStr()); |
Anders Carlsson | d04c6e2 | 2007-11-27 04:11:28 +0000 | [diff] [blame] | 1505 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1506 | |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1507 | Expr *InputExpr = Exprs[i]; |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1508 | |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1509 | // Only allow void types for memory constraints. |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1510 | if (Info.allowsMemory() && !Info.allowsRegister()) { |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1511 | if (CheckAsmLValue(InputExpr, *this)) |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1512 | return StmtError(Diag(InputExpr->getLocStart(), |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1513 | diag::err_asm_invalid_lvalue_in_input) |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1514 | << Info.getConstraintStr() |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1515 | << InputExpr->getSourceRange()); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1516 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1517 | |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1518 | if (Info.allowsRegister()) { |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1519 | if (InputExpr->getType()->isVoidType()) { |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1520 | return StmtError(Diag(InputExpr->getLocStart(), |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1521 | diag::err_asm_invalid_type_in_input) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1522 | << InputExpr->getType() << Info.getConstraintStr() |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1523 | << InputExpr->getSourceRange()); |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1524 | } |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1525 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1526 | |
Douglas Gregor | a873dfc | 2010-02-03 00:27:59 +0000 | [diff] [blame] | 1527 | DefaultFunctionArrayLvalueConversion(Exprs[i]); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1528 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1529 | InputConstraintInfos.push_back(Info); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1530 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1531 | |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 1532 | // Check that the clobbers are valid. |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1533 | for (unsigned i = 0; i != NumClobbers; i++) { |
| 1534 | StringLiteral *Literal = Clobbers[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1535 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1536 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1537 | << Literal->getSourceRange()); |
| 1538 | |
Anders Carlsson | fdba9c0 | 2010-01-30 19:34:25 +0000 | [diff] [blame] | 1539 | llvm::StringRef Clobber = Literal->getString(); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1540 | |
Anders Carlsson | fdba9c0 | 2010-01-30 19:34:25 +0000 | [diff] [blame] | 1541 | if (!Context.Target.isValidGCCRegisterName(Clobber)) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1542 | return StmtError(Diag(Literal->getLocStart(), |
Daniel Dunbar | 7765934 | 2009-08-19 20:04:03 +0000 | [diff] [blame] | 1543 | diag::err_asm_unknown_register_name) << Clobber); |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 1544 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1545 | |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1546 | AsmStmt *NS = |
Anders Carlsson | 966146e | 2010-01-30 23:19:41 +0000 | [diff] [blame] | 1547 | new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, |
| 1548 | NumOutputs, NumInputs, Names, Constraints, Exprs, |
| 1549 | AsmString, NumClobbers, Clobbers, RParenLoc); |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1550 | // Validate the asm string, ensuring it makes sense given the operands we |
| 1551 | // have. |
| 1552 | llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; |
| 1553 | unsigned DiagOffs; |
| 1554 | if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { |
Chris Lattner | 2ff0f42 | 2009-03-10 23:57:07 +0000 | [diff] [blame] | 1555 | Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) |
| 1556 | << AsmString->getSourceRange(); |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1557 | return StmtError(); |
| 1558 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1559 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1560 | // Validate tied input operands for type mismatches. |
| 1561 | for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { |
| 1562 | TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1563 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1564 | // If this is a tied constraint, verify that the output and input have |
| 1565 | // either exactly the same type, or that they are int/ptr operands with the |
| 1566 | // same size (int/long, int*/long, are ok etc). |
| 1567 | if (!Info.hasTiedOperand()) continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1568 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1569 | unsigned TiedTo = Info.getTiedOperand(); |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 1570 | Expr *OutputExpr = Exprs[TiedTo]; |
Chris Lattner | c1f3b28 | 2009-05-03 06:50:40 +0000 | [diff] [blame] | 1571 | Expr *InputExpr = Exprs[i+NumOutputs]; |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 1572 | QualType InTy = InputExpr->getType(); |
| 1573 | QualType OutTy = OutputExpr->getType(); |
| 1574 | if (Context.hasSameType(InTy, OutTy)) |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1575 | continue; // All types can be tied to themselves. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1576 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1577 | // Decide if the input and output are in the same domain (integer/ptr or |
| 1578 | // floating point. |
| 1579 | enum AsmDomain { |
| 1580 | AD_Int, AD_FP, AD_Other |
| 1581 | } InputDomain, OutputDomain; |
| 1582 | |
| 1583 | if (InTy->isIntegerType() || InTy->isPointerType()) |
| 1584 | InputDomain = AD_Int; |
Douglas Gregor | 0c293ea | 2010-06-22 23:07:26 +0000 | [diff] [blame] | 1585 | else if (InTy->isRealFloatingType()) |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1586 | InputDomain = AD_FP; |
| 1587 | else |
| 1588 | InputDomain = AD_Other; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1589 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1590 | if (OutTy->isIntegerType() || OutTy->isPointerType()) |
| 1591 | OutputDomain = AD_Int; |
Douglas Gregor | 0c293ea | 2010-06-22 23:07:26 +0000 | [diff] [blame] | 1592 | else if (OutTy->isRealFloatingType()) |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1593 | OutputDomain = AD_FP; |
| 1594 | else |
| 1595 | OutputDomain = AD_Other; |
| 1596 | |
| 1597 | // They are ok if they are the same size and in the same domain. This |
| 1598 | // allows tying things like: |
| 1599 | // void* to int* |
| 1600 | // void* to int if they are the same size. |
| 1601 | // double to long double if they are the same size. |
| 1602 | // |
| 1603 | uint64_t OutSize = Context.getTypeSize(OutTy); |
| 1604 | uint64_t InSize = Context.getTypeSize(InTy); |
| 1605 | if (OutSize == InSize && InputDomain == OutputDomain && |
| 1606 | InputDomain != AD_Other) |
| 1607 | continue; |
| 1608 | |
| 1609 | // If the smaller input/output operand is not mentioned in the asm string, |
| 1610 | // then we can promote it and the asm string won't notice. Check this |
| 1611 | // case now. |
| 1612 | bool SmallerValueMentioned = false; |
| 1613 | for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { |
| 1614 | AsmStmt::AsmStringPiece &Piece = Pieces[p]; |
| 1615 | if (!Piece.isOperand()) continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1616 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1617 | // If this is a reference to the input and if the input was the smaller |
| 1618 | // one, then we have to reject this asm. |
| 1619 | if (Piece.getOperandNo() == i+NumOutputs) { |
| 1620 | if (InSize < OutSize) { |
| 1621 | SmallerValueMentioned = true; |
| 1622 | break; |
Chris Lattner | 3351f11 | 2009-05-03 08:32:32 +0000 | [diff] [blame] | 1623 | } |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 1624 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1625 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1626 | // If this is a reference to the input and if the input was the smaller |
| 1627 | // one, then we have to reject this asm. |
| 1628 | if (Piece.getOperandNo() == TiedTo) { |
| 1629 | if (InSize > OutSize) { |
| 1630 | SmallerValueMentioned = true; |
| 1631 | break; |
| 1632 | } |
| 1633 | } |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1634 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1635 | |
Chris Lattner | aab64d0 | 2010-04-23 17:27:29 +0000 | [diff] [blame] | 1636 | // If the smaller value wasn't mentioned in the asm string, and if the |
| 1637 | // output was a register, just extend the shorter one to the size of the |
| 1638 | // larger one. |
| 1639 | if (!SmallerValueMentioned && InputDomain != AD_Other && |
| 1640 | OutputConstraintInfos[TiedTo].allowsRegister()) |
| 1641 | continue; |
| 1642 | |
Chris Lattner | c1f3b28 | 2009-05-03 06:50:40 +0000 | [diff] [blame] | 1643 | Diag(InputExpr->getLocStart(), |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1644 | diag::err_asm_tying_incompatible_types) |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 1645 | << InTy << OutTy << OutputExpr->getSourceRange() |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1646 | << InputExpr->getSourceRange(); |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1647 | return StmtError(); |
| 1648 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1649 | |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1650 | return Owned(NS); |
Chris Lattner | fe79595 | 2007-10-29 04:04:16 +0000 | [diff] [blame] | 1651 | } |
Fariborz Jahanian | 3b1191d | 2007-11-01 23:59:59 +0000 | [diff] [blame] | 1652 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1653 | StmtResult |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1654 | Sema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 1655 | SourceLocation RParen, Decl *Parm, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1656 | Stmt *Body) { |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 1657 | VarDecl *Var = cast_or_null<VarDecl>(Parm); |
Douglas Gregor | 160b563 | 2010-04-26 17:32:49 +0000 | [diff] [blame] | 1658 | if (Var && Var->isInvalidDecl()) |
| 1659 | return StmtError(); |
| 1660 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1661 | return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); |
Fariborz Jahanian | 3b1191d | 2007-11-01 23:59:59 +0000 | [diff] [blame] | 1662 | } |
| 1663 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1664 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1665 | Sema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { |
| 1666 | return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); |
Fariborz Jahanian | 161a9c5 | 2007-11-02 00:18:53 +0000 | [diff] [blame] | 1667 | } |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 1668 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1669 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1670 | Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, |
| 1671 | MultiStmtArg CatchStmts, Stmt *Finally) { |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1672 | getCurFunction()->setHasBranchProtectedScope(); |
Douglas Gregor | 8f5e3dd | 2010-04-23 22:50:49 +0000 | [diff] [blame] | 1673 | unsigned NumCatchStmts = CatchStmts.size(); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1674 | return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, |
| 1675 | CatchStmts.release(), |
Douglas Gregor | 8f5e3dd | 2010-04-23 22:50:49 +0000 | [diff] [blame] | 1676 | NumCatchStmts, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1677 | Finally)); |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 1678 | } |
| 1679 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1680 | StmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1681 | Expr *Throw) { |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 1682 | if (Throw) { |
John McCall | 5e3c67b | 2010-12-15 04:42:30 +0000 | [diff] [blame] | 1683 | DefaultLvalueConversion(Throw); |
| 1684 | |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 1685 | QualType ThrowType = Throw->getType(); |
| 1686 | // Make sure the expression type is an ObjC pointer or "void *". |
| 1687 | if (!ThrowType->isDependentType() && |
| 1688 | !ThrowType->isObjCObjectPointerType()) { |
| 1689 | const PointerType *PT = ThrowType->getAs<PointerType>(); |
| 1690 | if (!PT || !PT->getPointeeType()->isVoidType()) |
| 1691 | return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) |
| 1692 | << Throw->getType() << Throw->getSourceRange()); |
| 1693 | } |
| 1694 | } |
| 1695 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1696 | return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 1697 | } |
| 1698 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1699 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1700 | Sema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 1701 | Scope *CurScope) { |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1702 | if (!Throw) { |
Steve Naroff | e21dd6f | 2009-02-11 20:05:44 +0000 | [diff] [blame] | 1703 | // @throw without an expression designates a rethrow (which much occur |
| 1704 | // in the context of an @catch clause). |
| 1705 | Scope *AtCatchParent = CurScope; |
| 1706 | while (AtCatchParent && !AtCatchParent->isAtCatchScope()) |
| 1707 | AtCatchParent = AtCatchParent->getParent(); |
| 1708 | if (!AtCatchParent) |
Steve Naroff | 4ab2414 | 2009-02-12 18:09:32 +0000 | [diff] [blame] | 1709 | return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); |
Douglas Gregor | d1377b2 | 2010-04-22 21:44:01 +0000 | [diff] [blame] | 1710 | } |
| 1711 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1712 | return BuildObjCAtThrowStmt(AtLoc, Throw); |
Fariborz Jahanian | 39f8f15 | 2007-11-07 02:00:49 +0000 | [diff] [blame] | 1713 | } |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 1714 | |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1715 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1716 | Sema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, |
| 1717 | Stmt *SyncBody) { |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1718 | getCurFunction()->setHasBranchProtectedScope(); |
Chris Lattner | 46c3c4b | 2009-04-21 06:01:00 +0000 | [diff] [blame] | 1719 | |
John McCall | 5e3c67b | 2010-12-15 04:42:30 +0000 | [diff] [blame] | 1720 | DefaultLvalueConversion(SyncExpr); |
| 1721 | |
Chris Lattner | a868a20 | 2009-04-21 06:11:25 +0000 | [diff] [blame] | 1722 | // Make sure the expression type is an ObjC pointer or "void *". |
Douglas Gregor | 8fdc13a | 2010-04-22 22:01:21 +0000 | [diff] [blame] | 1723 | if (!SyncExpr->getType()->isDependentType() && |
| 1724 | !SyncExpr->getType()->isObjCObjectPointerType()) { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 1725 | const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); |
Chris Lattner | a868a20 | 2009-04-21 06:11:25 +0000 | [diff] [blame] | 1726 | if (!PT || !PT->getPointeeType()->isVoidType()) |
| 1727 | return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) |
| 1728 | << SyncExpr->getType() << SyncExpr->getSourceRange()); |
| 1729 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1730 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1731 | return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); |
Fariborz Jahanian | fa3ee8e | 2008-01-29 19:14:59 +0000 | [diff] [blame] | 1732 | } |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 1733 | |
| 1734 | /// ActOnCXXCatchBlock - Takes an exception declaration and a handler block |
| 1735 | /// and creates a proper catch handler from them. |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1736 | StmtResult |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 1737 | Sema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1738 | Stmt *HandlerBlock) { |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 1739 | // There's nothing to test that ActOnExceptionDecl didn't already test. |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1740 | return Owned(new (Context) CXXCatchStmt(CatchLoc, |
John McCall | d226f65 | 2010-08-21 09:40:31 +0000 | [diff] [blame] | 1741 | cast_or_null<VarDecl>(ExDecl), |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1742 | HandlerBlock)); |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 1743 | } |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1744 | |
Dan Gohman | 3c46e8d | 2010-07-26 21:25:24 +0000 | [diff] [blame] | 1745 | namespace { |
| 1746 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1747 | class TypeWithHandler { |
| 1748 | QualType t; |
| 1749 | CXXCatchStmt *stmt; |
| 1750 | public: |
| 1751 | TypeWithHandler(const QualType &type, CXXCatchStmt *statement) |
| 1752 | : t(type), stmt(statement) {} |
| 1753 | |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 1754 | // An arbitrary order is fine as long as it places identical |
| 1755 | // types next to each other. |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1756 | bool operator<(const TypeWithHandler &y) const { |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 1757 | if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1758 | return true; |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 1759 | if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1760 | return false; |
| 1761 | else |
| 1762 | return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); |
| 1763 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1764 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1765 | bool operator==(const TypeWithHandler& other) const { |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 1766 | return t == other.t; |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1767 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1768 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1769 | CXXCatchStmt *getCatchStmt() const { return stmt; } |
| 1770 | SourceLocation getTypeSpecStartLoc() const { |
| 1771 | return stmt->getExceptionDecl()->getTypeSpecStartLoc(); |
| 1772 | } |
| 1773 | }; |
| 1774 | |
Dan Gohman | 3c46e8d | 2010-07-26 21:25:24 +0000 | [diff] [blame] | 1775 | } |
| 1776 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1777 | /// ActOnCXXTryBlock - Takes a try compound-statement and a number of |
| 1778 | /// handlers and creates a try statement from them. |
John McCall | 60d7b3a | 2010-08-24 06:29:42 +0000 | [diff] [blame] | 1779 | StmtResult |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1780 | Sema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1781 | MultiStmtArg RawHandlers) { |
| 1782 | unsigned NumHandlers = RawHandlers.size(); |
| 1783 | assert(NumHandlers > 0 && |
| 1784 | "The parser shouldn't call this if there are no handlers."); |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1785 | Stmt **Handlers = RawHandlers.get(); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1786 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1787 | llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1788 | |
| 1789 | for (unsigned i = 0; i < NumHandlers; ++i) { |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1790 | CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1791 | if (!Handler->getExceptionDecl()) { |
| 1792 | if (i < NumHandlers - 1) |
| 1793 | return StmtError(Diag(Handler->getLocStart(), |
| 1794 | diag::err_early_catch_all)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1795 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1796 | continue; |
| 1797 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1798 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1799 | const QualType CaughtType = Handler->getCaughtType(); |
| 1800 | const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); |
| 1801 | TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1802 | } |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1803 | |
| 1804 | // Detect handlers for the same type as an earlier one. |
| 1805 | if (NumHandlers > 1) { |
| 1806 | llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1807 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1808 | TypeWithHandler prev = TypesWithHandlers[0]; |
| 1809 | for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { |
| 1810 | TypeWithHandler curr = TypesWithHandlers[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1811 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1812 | if (curr == prev) { |
| 1813 | Diag(curr.getTypeSpecStartLoc(), |
| 1814 | diag::warn_exception_caught_by_earlier_handler) |
| 1815 | << curr.getCatchStmt()->getCaughtType().getAsString(); |
| 1816 | Diag(prev.getTypeSpecStartLoc(), |
| 1817 | diag::note_previous_exception_handler) |
| 1818 | << prev.getCatchStmt()->getCaughtType().getAsString(); |
| 1819 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1820 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1821 | prev = curr; |
| 1822 | } |
| 1823 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1824 | |
John McCall | 781472f | 2010-08-25 08:40:02 +0000 | [diff] [blame] | 1825 | getCurFunction()->setHasBranchProtectedScope(); |
John McCall | b60a77e | 2010-08-01 00:26:45 +0000 | [diff] [blame] | 1826 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1827 | // FIXME: We should detect handlers that cannot catch anything because an |
| 1828 | // earlier handler catches a superclass. Need to find a method that is not |
| 1829 | // quadratic for this. |
| 1830 | // Neither of these are explicitly forbidden, but every compiler detects them |
| 1831 | // and warns. |
| 1832 | |
John McCall | 9ae2f07 | 2010-08-23 23:25:46 +0000 | [diff] [blame] | 1833 | return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, |
Sam Weinig | a1a396d | 2010-02-03 03:56:39 +0000 | [diff] [blame] | 1834 | Handlers, NumHandlers)); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1835 | } |