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 | |
| 14 | #include "Sema.h" |
Anders Carlsson | 51fe996 | 2008-11-22 21:04:56 +0000 | [diff] [blame] | 15 | #include "clang/AST/APValue.h" |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 16 | #include "clang/AST/ASTContext.h" |
Daniel Dunbar | c4a1dea | 2008-08-11 05:35:13 +0000 | [diff] [blame] | 17 | #include "clang/AST/DeclObjC.h" |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 18 | #include "clang/AST/ExprObjC.h" |
Chris Lattner | 16f0049 | 2009-04-26 01:32:48 +0000 | [diff] [blame] | 19 | #include "clang/AST/StmtObjC.h" |
| 20 | #include "clang/AST/StmtCXX.h" |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 21 | #include "clang/Basic/TargetInfo.h" |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 22 | #include "llvm/ADT/STLExtras.h" |
| 23 | #include "llvm/ADT/SmallVector.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 24 | using namespace clang; |
| 25 | |
Anders Carlsson | 6b1d283 | 2009-05-17 21:11:30 +0000 | [diff] [blame] | 26 | Sema::OwningStmtResult Sema::ActOnExprStmt(FullExprArg expr) { |
| 27 | Expr *E = expr->takeAs<Expr>(); |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 28 | assert(E && "ActOnExprStmt(): missing expression"); |
Fariborz Jahanian | 16b1037 | 2009-09-03 00:43:07 +0000 | [diff] [blame] | 29 | if (E->getType()->isObjCInterfaceType()) { |
| 30 | if (LangOpts.ObjCNonFragileABI) |
| 31 | Diag(E->getLocEnd(), diag::err_indirection_requires_nonfragile_object) |
| 32 | << E->getType(); |
| 33 | else |
| 34 | Diag(E->getLocEnd(), diag::err_direct_interface_unsupported) |
| 35 | << E->getType(); |
| 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 | |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 47 | Sema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) { |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 48 | return Owned(new (Context) NullStmt(SemiLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 49 | } |
| 50 | |
Chris Lattner | 682bf92 | 2009-03-29 16:50:03 +0000 | [diff] [blame] | 51 | Sema::OwningStmtResult 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 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 62 | void Sema::DiagnoseUnusedExprResult(const Stmt *S) { |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 63 | const Expr *E = dyn_cast_or_null<Expr>(S); |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 64 | if (!E) |
| 65 | return; |
| 66 | |
| 67 | // Ignore expressions that have void type. |
| 68 | if (E->getType()->isVoidType()) |
| 69 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 70 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 71 | SourceLocation Loc; |
| 72 | SourceRange R1, R2; |
| 73 | if (!E->isUnusedResultAWarning(Loc, R1, R2)) |
| 74 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 75 | |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 76 | // Okay, we have an unused result. Depending on what the base expression is, |
| 77 | // we might want to make a more specific diagnostic. Check for one of these |
| 78 | // cases now. |
| 79 | unsigned DiagID = diag::warn_unused_expr; |
| 80 | E = E->IgnoreParens(); |
Fariborz Jahanian | 09105f5 | 2009-08-20 17:02:02 +0000 | [diff] [blame] | 81 | if (isa<ObjCImplicitSetterGetterRefExpr>(E)) |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 82 | DiagID = diag::warn_unused_property_expr; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 83 | |
Chris Lattner | 419cfb3 | 2009-08-16 16:57:27 +0000 | [diff] [blame] | 84 | Diag(Loc, DiagID) << R1 << R2; |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 85 | } |
| 86 | |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 87 | Action::OwningStmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 88 | Sema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 89 | MultiStmtArg elts, bool isStmtExpr) { |
| 90 | unsigned NumElts = elts.size(); |
| 91 | Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 92 | // If we're in C89 mode, check that we don't have any decls after stmts. If |
| 93 | // so, emit an extension diagnostic. |
| 94 | if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { |
| 95 | // Note that __extension__ can be around a decl. |
| 96 | unsigned i = 0; |
| 97 | // Skip over all declarations. |
| 98 | for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) |
| 99 | /*empty*/; |
| 100 | |
| 101 | // We found the end of the list or a statement. Scan for another declstmt. |
| 102 | for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) |
| 103 | /*empty*/; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 104 | |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 105 | if (i != NumElts) { |
Douglas Gregor | 4afa39d | 2009-01-20 01:17:11 +0000 | [diff] [blame] | 106 | Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); |
Chris Lattner | c30ebfb | 2007-08-27 04:29:41 +0000 | [diff] [blame] | 107 | Diag(D->getLocation(), diag::ext_mixed_decls_code); |
| 108 | } |
| 109 | } |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 110 | // Warn about unused expressions in statements. |
| 111 | for (unsigned i = 0; i != NumElts; ++i) { |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 112 | // Ignore statements that are last in a statement expression. |
| 113 | if (isStmtExpr && i == NumElts - 1) |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 114 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 115 | |
Anders Carlsson | 636463e | 2009-07-30 22:17:18 +0000 | [diff] [blame] | 116 | DiagnoseUnusedExprResult(Elts[i]); |
Chris Lattner | 98414c1 | 2007-08-31 21:49:55 +0000 | [diff] [blame] | 117 | } |
Sebastian Redl | a60528c | 2008-12-21 12:04:03 +0000 | [diff] [blame] | 118 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 119 | return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 120 | } |
| 121 | |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 122 | Action::OwningStmtResult |
| 123 | Sema::ActOnCaseStmt(SourceLocation CaseLoc, ExprArg lhsval, |
| 124 | SourceLocation DotDotDotLoc, ExprArg rhsval, |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 125 | SourceLocation ColonLoc) { |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 126 | assert((lhsval.get() != 0) && "missing expression in case statement"); |
| 127 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 128 | // C99 6.8.4.2p3: The expression shall be an integer constant. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 129 | // However, GCC allows any evaluatable integer expression. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 130 | Expr *LHSVal = static_cast<Expr*>(lhsval.get()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 131 | if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 132 | VerifyIntegerConstantExpression(LHSVal)) |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 133 | return StmtError(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 134 | |
Chris Lattner | 6c36be5 | 2007-07-18 02:28:47 +0000 | [diff] [blame] | 135 | // GCC extension: The expression shall be an integer constant. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 136 | |
| 137 | Expr *RHSVal = static_cast<Expr*>(rhsval.get()); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 138 | if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && |
| 139 | VerifyIntegerConstantExpression(RHSVal)) { |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 140 | RHSVal = 0; // Recover by just forgetting about it. |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 141 | rhsval = 0; |
| 142 | } |
| 143 | |
Chris Lattner | bcfce66 | 2009-04-18 20:10:59 +0000 | [diff] [blame] | 144 | if (getSwitchStack().empty()) { |
Chris Lattner | 8a87e57 | 2007-07-23 17:05:23 +0000 | [diff] [blame] | 145 | Diag(CaseLoc, diag::err_case_not_in_switch); |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 146 | return StmtError(); |
Chris Lattner | 8a87e57 | 2007-07-23 17:05:23 +0000 | [diff] [blame] | 147 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 148 | |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 149 | // Only now release the smart pointers. |
| 150 | lhsval.release(); |
| 151 | rhsval.release(); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 152 | CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, |
| 153 | ColonLoc); |
Chris Lattner | bcfce66 | 2009-04-18 20:10:59 +0000 | [diff] [blame] | 154 | getSwitchStack().back()->addSwitchCase(CS); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 155 | return Owned(CS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 156 | } |
| 157 | |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 158 | /// ActOnCaseStmtBody - This installs a statement as the body of a case. |
| 159 | void Sema::ActOnCaseStmtBody(StmtTy *caseStmt, StmtArg subStmt) { |
| 160 | CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); |
Anders Carlsson | f1b1d59 | 2009-05-01 19:30:39 +0000 | [diff] [blame] | 161 | Stmt *SubStmt = subStmt.takeAs<Stmt>(); |
Chris Lattner | 24e1e70 | 2009-03-04 04:23:07 +0000 | [diff] [blame] | 162 | CS->setSubStmt(SubStmt); |
| 163 | } |
| 164 | |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 165 | Action::OwningStmtResult |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 166 | Sema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 167 | StmtArg subStmt, Scope *CurScope) { |
Anders Carlsson | f1b1d59 | 2009-05-01 19:30:39 +0000 | [diff] [blame] | 168 | Stmt *SubStmt = subStmt.takeAs<Stmt>(); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 169 | |
Chris Lattner | bcfce66 | 2009-04-18 20:10:59 +0000 | [diff] [blame] | 170 | if (getSwitchStack().empty()) { |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 171 | Diag(DefaultLoc, diag::err_default_not_in_switch); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 172 | return Owned(SubStmt); |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 173 | } |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 174 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 175 | DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); |
Chris Lattner | bcfce66 | 2009-04-18 20:10:59 +0000 | [diff] [blame] | 176 | getSwitchStack().back()->addSwitchCase(DS); |
Sebastian Redl | 117054a | 2008-12-28 16:13:43 +0000 | [diff] [blame] | 177 | return Owned(DS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 178 | } |
| 179 | |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 180 | Action::OwningStmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 181 | Sema::ActOnLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 182 | SourceLocation ColonLoc, StmtArg subStmt) { |
Anders Carlsson | f1b1d59 | 2009-05-01 19:30:39 +0000 | [diff] [blame] | 183 | Stmt *SubStmt = subStmt.takeAs<Stmt>(); |
Steve Naroff | f3cf897 | 2009-02-28 16:48:43 +0000 | [diff] [blame] | 184 | // Look up the record for this label identifier. |
Chris Lattner | ea29a3a | 2009-04-18 20:01:55 +0000 | [diff] [blame] | 185 | LabelStmt *&LabelDecl = getLabelMap()[II]; |
Steve Naroff | f3cf897 | 2009-02-28 16:48:43 +0000 | [diff] [blame] | 186 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 187 | // If not forward referenced or defined already, just create a new LabelStmt. |
Steve Naroff | caaacec | 2009-03-13 15:38:40 +0000 | [diff] [blame] | 188 | if (LabelDecl == 0) |
| 189 | return Owned(LabelDecl = new (Context) LabelStmt(IdentLoc, II, SubStmt)); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 190 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 191 | assert(LabelDecl->getID() == II && "Label mismatch!"); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 192 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 193 | // Otherwise, this label was either forward reference or multiply defined. If |
| 194 | // multiply defined, reject it now. |
| 195 | if (LabelDecl->getSubStmt()) { |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 196 | Diag(IdentLoc, diag::err_redefinition_of_label) << LabelDecl->getID(); |
Chris Lattner | 5f4a682 | 2008-11-23 23:12:31 +0000 | [diff] [blame] | 197 | Diag(LabelDecl->getIdentLoc(), diag::note_previous_definition); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 198 | return Owned(SubStmt); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 199 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 200 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 201 | // Otherwise, this label was forward declared, and we just found its real |
| 202 | // definition. Fill in the forward definition and return it. |
| 203 | LabelDecl->setIdentLoc(IdentLoc); |
Chris Lattner | 0fa152e | 2007-07-21 03:00:26 +0000 | [diff] [blame] | 204 | LabelDecl->setSubStmt(SubStmt); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 205 | return Owned(LabelDecl); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 206 | } |
| 207 | |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 208 | Action::OwningStmtResult |
Anders Carlsson | a99fad8 | 2009-05-17 18:26:53 +0000 | [diff] [blame] | 209 | Sema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 210 | StmtArg ThenVal, SourceLocation ElseLoc, |
| 211 | StmtArg ElseVal) { |
Anders Carlsson | a99fad8 | 2009-05-17 18:26:53 +0000 | [diff] [blame] | 212 | OwningExprResult CondResult(CondVal.release()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 213 | |
Anders Carlsson | a99fad8 | 2009-05-17 18:26:53 +0000 | [diff] [blame] | 214 | Expr *condExpr = CondResult.takeAs<Expr>(); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 215 | |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 216 | assert(condExpr && "ActOnIfStmt(): missing expression"); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 217 | |
Douglas Gregor | d06f6ca | 2009-05-15 18:53:42 +0000 | [diff] [blame] | 218 | if (!condExpr->isTypeDependent()) { |
| 219 | DefaultFunctionArrayConversion(condExpr); |
| 220 | // Take ownership again until we're past the error checking. |
Anders Carlsson | a99fad8 | 2009-05-17 18:26:53 +0000 | [diff] [blame] | 221 | CondResult = condExpr; |
Douglas Gregor | d06f6ca | 2009-05-15 18:53:42 +0000 | [diff] [blame] | 222 | QualType condType = condExpr->getType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 223 | |
Douglas Gregor | d06f6ca | 2009-05-15 18:53:42 +0000 | [diff] [blame] | 224 | if (getLangOptions().CPlusPlus) { |
| 225 | if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 |
| 226 | return StmtError(); |
| 227 | } else if (!condType->isScalarType()) // C99 6.8.4.1p1 |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 228 | return StmtError(Diag(IfLoc, |
Douglas Gregor | d06f6ca | 2009-05-15 18:53:42 +0000 | [diff] [blame] | 229 | diag::err_typecheck_statement_requires_scalar) |
| 230 | << condType << condExpr->getSourceRange()); |
| 231 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 232 | |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 233 | Stmt *thenStmt = ThenVal.takeAs<Stmt>(); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 234 | DiagnoseUnusedExprResult(thenStmt); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 235 | |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 236 | // Warn if the if block has a null body without an else value. |
| 237 | // this helps prevent bugs due to typos, such as |
| 238 | // if (condition); |
| 239 | // do_stuff(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 240 | if (!ElseVal.get()) { |
Anders Carlsson | 2d85f8b | 2007-10-10 20:50:11 +0000 | [diff] [blame] | 241 | if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) |
| 242 | Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); |
| 243 | } |
| 244 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 245 | Stmt *elseStmt = ElseVal.takeAs<Stmt>(); |
| 246 | DiagnoseUnusedExprResult(elseStmt); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 247 | |
Anders Carlsson | a99fad8 | 2009-05-17 18:26:53 +0000 | [diff] [blame] | 248 | CondResult.release(); |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 249 | return Owned(new (Context) IfStmt(IfLoc, condExpr, thenStmt, |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 250 | ElseLoc, elseStmt)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 251 | } |
| 252 | |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 253 | Action::OwningStmtResult |
| 254 | Sema::ActOnStartOfSwitchStmt(ExprArg cond) { |
Anders Carlsson | f1b1d59 | 2009-05-01 19:30:39 +0000 | [diff] [blame] | 255 | Expr *Cond = cond.takeAs<Expr>(); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 256 | |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 257 | if (getLangOptions().CPlusPlus) { |
| 258 | // C++ 6.4.2.p2: |
| 259 | // The condition shall be of integral type, enumeration type, or of a class |
| 260 | // type for which a single conversion function to integral or enumeration |
| 261 | // type exists (12.3). If the condition is of class type, the condition is |
| 262 | // converted by calling that conversion function, and the result of the |
| 263 | // conversion is used in place of the original condition for the remainder |
| 264 | // of this section. Integral promotions are performed. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 265 | if (!Cond->isTypeDependent()) { |
| 266 | QualType Ty = Cond->getType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 267 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 268 | // FIXME: Handle class types. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 269 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 270 | // If the type is wrong a diagnostic will be emitted later at |
| 271 | // ActOnFinishSwitchStmt. |
| 272 | if (Ty->isIntegralType() || Ty->isEnumeralType()) { |
| 273 | // Integral promotions are performed. |
| 274 | // FIXME: Integral promotions for C++ are not complete. |
| 275 | UsualUnaryConversions(Cond); |
| 276 | } |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 277 | } |
| 278 | } else { |
| 279 | // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. |
| 280 | UsualUnaryConversions(Cond); |
| 281 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 282 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 283 | SwitchStmt *SS = new (Context) SwitchStmt(Cond); |
Chris Lattner | bcfce66 | 2009-04-18 20:10:59 +0000 | [diff] [blame] | 284 | getSwitchStack().push_back(SS); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 285 | return Owned(SS); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 286 | } |
Chris Lattner | 6c36be5 | 2007-07-18 02:28:47 +0000 | [diff] [blame] | 287 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 288 | /// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have |
| 289 | /// the specified width and sign. If an overflow occurs, detect it and emit |
| 290 | /// the specified diagnostic. |
| 291 | void Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, |
| 292 | unsigned NewWidth, bool NewSign, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 293 | SourceLocation Loc, |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 294 | unsigned DiagID) { |
| 295 | // Perform a conversion to the promoted condition type if needed. |
| 296 | if (NewWidth > Val.getBitWidth()) { |
| 297 | // If this is an extension, just do it. |
| 298 | llvm::APSInt OldVal(Val); |
| 299 | Val.extend(NewWidth); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 300 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 301 | // If the input was signed and negative and the output is unsigned, |
| 302 | // warn. |
| 303 | if (!NewSign && OldVal.isSigned() && OldVal.isNegative()) |
Chris Lattner | d3a94e2 | 2008-11-20 06:06:08 +0000 | [diff] [blame] | 304 | Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 305 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 306 | Val.setIsSigned(NewSign); |
| 307 | } else if (NewWidth < Val.getBitWidth()) { |
| 308 | // If this is a truncation, check for overflow. |
| 309 | llvm::APSInt ConvVal(Val); |
| 310 | ConvVal.trunc(NewWidth); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 311 | ConvVal.setIsSigned(NewSign); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 312 | ConvVal.extend(Val.getBitWidth()); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 313 | ConvVal.setIsSigned(Val.isSigned()); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 314 | if (ConvVal != Val) |
Chris Lattner | d3a94e2 | 2008-11-20 06:06:08 +0000 | [diff] [blame] | 315 | Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 316 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 317 | // Regardless of whether a diagnostic was emitted, really do the |
| 318 | // truncation. |
| 319 | Val.trunc(NewWidth); |
Chris Lattner | b2137ae | 2007-08-23 22:08:35 +0000 | [diff] [blame] | 320 | Val.setIsSigned(NewSign); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 321 | } else if (NewSign != Val.isSigned()) { |
| 322 | // Convert the sign to match the sign of the condition. This can cause |
| 323 | // overflow as well: unsigned(INTMIN) |
| 324 | llvm::APSInt OldVal(Val); |
| 325 | Val.setIsSigned(NewSign); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 326 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 327 | if (Val.isNegative()) // Sign bit changes meaning. |
Chris Lattner | d3a94e2 | 2008-11-20 06:06:08 +0000 | [diff] [blame] | 328 | Diag(Loc, DiagID) << OldVal.toString(10) << Val.toString(10); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 329 | } |
| 330 | } |
| 331 | |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 332 | namespace { |
| 333 | struct CaseCompareFunctor { |
| 334 | bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| 335 | const llvm::APSInt &RHS) { |
| 336 | return LHS.first < RHS; |
| 337 | } |
Chris Lattner | 0e85a27 | 2007-09-03 18:31:57 +0000 | [diff] [blame] | 338 | bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, |
| 339 | const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| 340 | return LHS.first < RHS.first; |
| 341 | } |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 342 | bool operator()(const llvm::APSInt &LHS, |
| 343 | const std::pair<llvm::APSInt, CaseStmt*> &RHS) { |
| 344 | return LHS < RHS.first; |
| 345 | } |
| 346 | }; |
| 347 | } |
| 348 | |
Chris Lattner | 764a7ce | 2007-09-21 18:15:22 +0000 | [diff] [blame] | 349 | /// CmpCaseVals - Comparison predicate for sorting case values. |
| 350 | /// |
| 351 | static bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, |
| 352 | const std::pair<llvm::APSInt, CaseStmt*>& rhs) { |
| 353 | if (lhs.first < rhs.first) |
| 354 | return true; |
| 355 | |
| 356 | if (lhs.first == rhs.first && |
| 357 | lhs.second->getCaseLoc().getRawEncoding() |
| 358 | < rhs.second->getCaseLoc().getRawEncoding()) |
| 359 | return true; |
| 360 | return false; |
| 361 | } |
| 362 | |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 363 | Action::OwningStmtResult |
| 364 | Sema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, StmtArg Switch, |
| 365 | StmtArg Body) { |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 366 | Stmt *BodyStmt = Body.takeAs<Stmt>(); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 367 | |
Chris Lattner | bcfce66 | 2009-04-18 20:10:59 +0000 | [diff] [blame] | 368 | SwitchStmt *SS = getSwitchStack().back(); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 369 | assert(SS == (SwitchStmt*)Switch.get() && "switch stack missing push/pop!"); |
| 370 | |
Steve Naroff | 9dcbfa4 | 2007-09-01 21:08:38 +0000 | [diff] [blame] | 371 | SS->setBody(BodyStmt, SwitchLoc); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 372 | getSwitchStack().pop_back(); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 373 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 374 | Expr *CondExpr = SS->getCond(); |
| 375 | QualType CondType = CondExpr->getType(); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 376 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 377 | if (!CondExpr->isTypeDependent() && |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 378 | !CondType->isIntegerType()) { // C99 6.8.4.2p1 |
Chris Lattner | d3a94e2 | 2008-11-20 06:06:08 +0000 | [diff] [blame] | 379 | Diag(SwitchLoc, diag::err_typecheck_statement_requires_integer) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 380 | << CondType << CondExpr->getSourceRange(); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 381 | return StmtError(); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 382 | } |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 383 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 384 | // Get the bitwidth of the switched-on value before promotions. We must |
| 385 | // convert the integer case values to this width before comparison. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 386 | bool HasDependentValue |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 387 | = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 388 | unsigned CondWidth |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 389 | = HasDependentValue? 0 |
| 390 | : static_cast<unsigned>(Context.getTypeSize(CondType)); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 391 | bool CondIsSigned = CondType->isSignedIntegerType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 392 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 393 | // Accumulate all of the case values in a vector so that we can sort them |
| 394 | // and detect duplicates. This vector contains the APInt for the case after |
| 395 | // it has been converted to the condition type. |
Chris Lattner | 0471f5b | 2007-08-23 18:29:20 +0000 | [diff] [blame] | 396 | typedef llvm::SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; |
| 397 | CaseValsTy CaseVals; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 398 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 399 | // Keep track of any GNU case ranges we see. The APSInt is the low value. |
| 400 | std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRanges; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 401 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 402 | DefaultStmt *TheDefaultStmt = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 403 | |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 404 | bool CaseListIsErroneous = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 405 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 406 | for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 407 | SC = SC->getNextSwitchCase()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 408 | |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 409 | if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 410 | if (TheDefaultStmt) { |
| 411 | Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); |
Chris Lattner | 5f4a682 | 2008-11-23 23:12:31 +0000 | [diff] [blame] | 412 | Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 413 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 414 | // FIXME: Remove the default statement from the switch block so that |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 415 | // we'll return a valid AST. This requires recursing down the AST and |
| 416 | // finding it, not something we are set up to do right now. For now, |
| 417 | // just lop the entire switch stmt out of the AST. |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 418 | CaseListIsErroneous = true; |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 419 | } |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 420 | TheDefaultStmt = DS; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 421 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 422 | } else { |
| 423 | CaseStmt *CS = cast<CaseStmt>(SC); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 424 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 425 | // We already verified that the expression has a i-c-e value (C99 |
| 426 | // 6.8.4.2p3) - get that value now. |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 427 | Expr *Lo = CS->getLHS(); |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 428 | |
| 429 | if (Lo->isTypeDependent() || Lo->isValueDependent()) { |
| 430 | HasDependentValue = true; |
| 431 | break; |
| 432 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 433 | |
Anders Carlsson | 51fe996 | 2008-11-22 21:04:56 +0000 | [diff] [blame] | 434 | llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 435 | |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 436 | // Convert the value to the same width/sign as the condition. |
| 437 | ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, |
| 438 | CS->getLHS()->getLocStart(), |
| 439 | diag::warn_case_value_overflow); |
Anders Carlsson | c1fcb77 | 2007-07-22 07:07:56 +0000 | [diff] [blame] | 440 | |
Chris Lattner | 1e0a390 | 2008-01-16 19:17:22 +0000 | [diff] [blame] | 441 | // If the LHS is not the same type as the condition, insert an implicit |
| 442 | // cast. |
| 443 | ImpCastExprToType(Lo, CondType); |
| 444 | CS->setLHS(Lo); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 445 | |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 446 | // If this is a case range, remember it in CaseRanges, otherwise CaseVals. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 447 | if (CS->getRHS()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 448 | if (CS->getRHS()->isTypeDependent() || |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 449 | CS->getRHS()->isValueDependent()) { |
| 450 | HasDependentValue = true; |
| 451 | break; |
| 452 | } |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 453 | CaseRanges.push_back(std::make_pair(LoVal, CS)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 454 | } else |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 455 | CaseVals.push_back(std::make_pair(LoVal, CS)); |
Chris Lattner | f4021e7 | 2007-08-23 05:46:52 +0000 | [diff] [blame] | 456 | } |
| 457 | } |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 458 | |
| 459 | if (!HasDependentValue) { |
| 460 | // Sort all the scalar case values so we can easily detect duplicates. |
| 461 | std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); |
| 462 | |
| 463 | if (!CaseVals.empty()) { |
| 464 | for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) { |
| 465 | if (CaseVals[i].first == CaseVals[i+1].first) { |
| 466 | // If we have a duplicate, report it. |
| 467 | Diag(CaseVals[i+1].second->getLHS()->getLocStart(), |
| 468 | diag::err_duplicate_case) << CaseVals[i].first.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 469 | Diag(CaseVals[i].second->getLHS()->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 470 | diag::note_duplicate_case_prev); |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 471 | // FIXME: We really want to remove the bogus case stmt from the |
| 472 | // substmt, but we have no way to do this right now. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 473 | CaseListIsErroneous = true; |
| 474 | } |
| 475 | } |
| 476 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 477 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 478 | // Detect duplicate case ranges, which usually don't exist at all in |
| 479 | // the first place. |
| 480 | if (!CaseRanges.empty()) { |
| 481 | // Sort all the case ranges by their low value so we can easily detect |
| 482 | // overlaps between ranges. |
| 483 | std::stable_sort(CaseRanges.begin(), CaseRanges.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 484 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 485 | // Scan the ranges, computing the high values and removing empty ranges. |
| 486 | std::vector<llvm::APSInt> HiVals; |
| 487 | for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
| 488 | CaseStmt *CR = CaseRanges[i].second; |
| 489 | Expr *Hi = CR->getRHS(); |
| 490 | llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 491 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 492 | // Convert the value to the same width/sign as the condition. |
| 493 | ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, |
| 494 | CR->getRHS()->getLocStart(), |
| 495 | diag::warn_case_value_overflow); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 496 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 497 | // If the LHS is not the same type as the condition, insert an implicit |
| 498 | // cast. |
| 499 | ImpCastExprToType(Hi, CondType); |
| 500 | CR->setRHS(Hi); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 501 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 502 | // If the low value is bigger than the high value, the case is empty. |
| 503 | if (CaseRanges[i].first > HiVal) { |
| 504 | Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) |
| 505 | << SourceRange(CR->getLHS()->getLocStart(), |
| 506 | CR->getRHS()->getLocEnd()); |
| 507 | CaseRanges.erase(CaseRanges.begin()+i); |
| 508 | --i, --e; |
| 509 | continue; |
| 510 | } |
| 511 | HiVals.push_back(HiVal); |
| 512 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 513 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 514 | // Rescan the ranges, looking for overlap with singleton values and other |
| 515 | // ranges. Since the range list is sorted, we only need to compare case |
| 516 | // ranges with their neighbors. |
| 517 | for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { |
| 518 | llvm::APSInt &CRLo = CaseRanges[i].first; |
| 519 | llvm::APSInt &CRHi = HiVals[i]; |
| 520 | CaseStmt *CR = CaseRanges[i].second; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 521 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 522 | // Check to see whether the case range overlaps with any |
| 523 | // singleton cases. |
| 524 | CaseStmt *OverlapStmt = 0; |
| 525 | llvm::APSInt OverlapVal(32); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 526 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 527 | // Find the smallest value >= the lower bound. If I is in the |
| 528 | // case range, then we have overlap. |
| 529 | CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), |
| 530 | CaseVals.end(), CRLo, |
| 531 | CaseCompareFunctor()); |
| 532 | if (I != CaseVals.end() && I->first < CRHi) { |
| 533 | OverlapVal = I->first; // Found overlap with scalar. |
| 534 | OverlapStmt = I->second; |
| 535 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 536 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 537 | // Find the smallest value bigger than the upper bound. |
| 538 | I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); |
| 539 | if (I != CaseVals.begin() && (I-1)->first >= CRLo) { |
| 540 | OverlapVal = (I-1)->first; // Found overlap with scalar. |
| 541 | OverlapStmt = (I-1)->second; |
| 542 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 543 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 544 | // Check to see if this case stmt overlaps with the subsequent |
| 545 | // case range. |
| 546 | if (i && CRLo <= HiVals[i-1]) { |
| 547 | OverlapVal = HiVals[i-1]; // Found overlap with range. |
| 548 | OverlapStmt = CaseRanges[i-1].second; |
| 549 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 550 | |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 551 | if (OverlapStmt) { |
| 552 | // If we have a duplicate, report it. |
| 553 | Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) |
| 554 | << OverlapVal.toString(10); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 555 | Diag(OverlapStmt->getLHS()->getLocStart(), |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 556 | diag::note_duplicate_case_prev); |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 557 | // FIXME: We really want to remove the bogus case stmt from the |
| 558 | // substmt, but we have no way to do this right now. |
Douglas Gregor | dbb26db | 2009-05-15 23:57:33 +0000 | [diff] [blame] | 559 | CaseListIsErroneous = true; |
| 560 | } |
Chris Lattner | f334850 | 2007-08-23 14:29:07 +0000 | [diff] [blame] | 561 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 562 | } |
| 563 | } |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 564 | |
Mike Stump | 390b4cc | 2009-05-16 07:39:55 +0000 | [diff] [blame] | 565 | // FIXME: If the case list was broken is some way, we don't have a good system |
| 566 | // to patch it up. Instead, just return the whole substmt as broken. |
Chris Lattner | b2ec9d6 | 2007-08-23 06:23:56 +0000 | [diff] [blame] | 567 | if (CaseListIsErroneous) |
Sebastian Redl | de30747 | 2009-01-11 00:38:46 +0000 | [diff] [blame] | 568 | return StmtError(); |
| 569 | |
| 570 | Switch.release(); |
| 571 | return Owned(SS); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 572 | } |
| 573 | |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 574 | Action::OwningStmtResult |
Anders Carlsson | 7f537c1 | 2009-05-17 21:22:26 +0000 | [diff] [blame] | 575 | Sema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, StmtArg Body) { |
| 576 | ExprArg CondArg(Cond.release()); |
| 577 | Expr *condExpr = CondArg.takeAs<Expr>(); |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 578 | assert(condExpr && "ActOnWhileStmt(): missing expression"); |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 579 | |
Douglas Gregor | 4a2e204 | 2009-05-15 21:45:53 +0000 | [diff] [blame] | 580 | if (!condExpr->isTypeDependent()) { |
| 581 | DefaultFunctionArrayConversion(condExpr); |
Anders Carlsson | 7f537c1 | 2009-05-17 21:22:26 +0000 | [diff] [blame] | 582 | CondArg = condExpr; |
Douglas Gregor | 4a2e204 | 2009-05-15 21:45:53 +0000 | [diff] [blame] | 583 | QualType condType = condExpr->getType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 584 | |
Douglas Gregor | 4a2e204 | 2009-05-15 21:45:53 +0000 | [diff] [blame] | 585 | if (getLangOptions().CPlusPlus) { |
| 586 | if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 |
| 587 | return StmtError(); |
| 588 | } else if (!condType->isScalarType()) // C99 6.8.5p2 |
| 589 | return StmtError(Diag(WhileLoc, |
| 590 | diag::err_typecheck_statement_requires_scalar) |
| 591 | << condType << condExpr->getSourceRange()); |
| 592 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 593 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 594 | Stmt *bodyStmt = Body.takeAs<Stmt>(); |
| 595 | DiagnoseUnusedExprResult(bodyStmt); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 596 | |
Anders Carlsson | 7f537c1 | 2009-05-17 21:22:26 +0000 | [diff] [blame] | 597 | CondArg.release(); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 598 | return Owned(new (Context) WhileStmt(condExpr, bodyStmt, WhileLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 599 | } |
| 600 | |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 601 | Action::OwningStmtResult |
| 602 | Sema::ActOnDoStmt(SourceLocation DoLoc, StmtArg Body, |
Chris Lattner | 9891359 | 2009-06-12 23:04:47 +0000 | [diff] [blame] | 603 | SourceLocation WhileLoc, SourceLocation CondLParen, |
| 604 | ExprArg Cond, SourceLocation CondRParen) { |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 605 | Expr *condExpr = Cond.takeAs<Expr>(); |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 606 | assert(condExpr && "ActOnDoStmt(): missing expression"); |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 607 | |
Douglas Gregor | 9f3ca2a | 2009-05-15 21:56:04 +0000 | [diff] [blame] | 608 | if (!condExpr->isTypeDependent()) { |
| 609 | DefaultFunctionArrayConversion(condExpr); |
| 610 | Cond = condExpr; |
| 611 | QualType condType = condExpr->getType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 612 | |
Douglas Gregor | 9f3ca2a | 2009-05-15 21:56:04 +0000 | [diff] [blame] | 613 | if (getLangOptions().CPlusPlus) { |
| 614 | if (CheckCXXBooleanCondition(condExpr)) // C++ 6.4p4 |
| 615 | return StmtError(); |
| 616 | } else if (!condType->isScalarType()) // C99 6.8.5p2 |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 617 | return StmtError(Diag(DoLoc, |
Douglas Gregor | 9f3ca2a | 2009-05-15 21:56:04 +0000 | [diff] [blame] | 618 | diag::err_typecheck_statement_requires_scalar) |
| 619 | << condType << condExpr->getSourceRange()); |
| 620 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 621 | |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 622 | Stmt *bodyStmt = Body.takeAs<Stmt>(); |
| 623 | DiagnoseUnusedExprResult(bodyStmt); |
| 624 | |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 625 | Cond.release(); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 626 | return Owned(new (Context) DoStmt(bodyStmt, condExpr, DoLoc, |
Chris Lattner | 9891359 | 2009-06-12 23:04:47 +0000 | [diff] [blame] | 627 | WhileLoc, CondRParen)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 628 | } |
| 629 | |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 630 | Action::OwningStmtResult |
| 631 | Sema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, |
| 632 | StmtArg first, ExprArg second, ExprArg third, |
| 633 | SourceLocation RParenLoc, StmtArg body) { |
| 634 | Stmt *First = static_cast<Stmt*>(first.get()); |
| 635 | Expr *Second = static_cast<Expr*>(second.get()); |
| 636 | Expr *Third = static_cast<Expr*>(third.get()); |
| 637 | Stmt *Body = static_cast<Stmt*>(body.get()); |
| 638 | |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 639 | if (!getLangOptions().CPlusPlus) { |
| 640 | if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { |
Chris Lattner | f3a41af | 2008-11-20 06:38:18 +0000 | [diff] [blame] | 641 | // C99 6.8.5p3: The declaration part of a 'for' statement shall only |
| 642 | // declare identifiers for objects having storage class 'auto' or |
| 643 | // 'register'. |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 644 | for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); |
| 645 | DI!=DE; ++DI) { |
| 646 | VarDecl *VD = dyn_cast<VarDecl>(*DI); |
| 647 | if (VD && VD->isBlockVarDecl() && !VD->hasLocalStorage()) |
| 648 | VD = 0; |
| 649 | if (VD == 0) |
| 650 | Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); |
| 651 | // FIXME: mark decl erroneous! |
| 652 | } |
Chris Lattner | ae3b701 | 2007-08-28 05:03:08 +0000 | [diff] [blame] | 653 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 654 | } |
Douglas Gregor | 5831c6a | 2009-05-15 22:12:32 +0000 | [diff] [blame] | 655 | if (Second && !Second->isTypeDependent()) { |
Chris Lattner | 36c4b0e | 2007-08-28 04:55:47 +0000 | [diff] [blame] | 656 | DefaultFunctionArrayConversion(Second); |
| 657 | QualType SecondType = Second->getType(); |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 658 | |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 659 | if (getLangOptions().CPlusPlus) { |
| 660 | if (CheckCXXBooleanCondition(Second)) // C++ 6.4p4 |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 661 | return StmtError(); |
Argyrios Kyrtzidis | 5921093 | 2008-09-10 02:17:11 +0000 | [diff] [blame] | 662 | } else if (!SecondType->isScalarType()) // C99 6.8.5p2 |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 663 | return StmtError(Diag(ForLoc, |
| 664 | diag::err_typecheck_statement_requires_scalar) |
| 665 | << SecondType << Second->getSourceRange()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 666 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 667 | |
Anders Carlsson | 3af708f | 2009-08-01 01:39:59 +0000 | [diff] [blame] | 668 | DiagnoseUnusedExprResult(First); |
| 669 | DiagnoseUnusedExprResult(Third); |
Anders Carlsson | 7544311 | 2009-07-30 22:39:03 +0000 | [diff] [blame] | 670 | DiagnoseUnusedExprResult(Body); |
| 671 | |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 672 | first.release(); |
| 673 | second.release(); |
| 674 | third.release(); |
| 675 | body.release(); |
Douglas Gregor | 5831c6a | 2009-05-15 22:12:32 +0000 | [diff] [blame] | 676 | return Owned(new (Context) ForStmt(First, Second, Third, Body, ForLoc, |
| 677 | LParenLoc, RParenLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 678 | } |
| 679 | |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 680 | Action::OwningStmtResult |
| 681 | Sema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, |
| 682 | SourceLocation LParenLoc, |
| 683 | StmtArg first, ExprArg second, |
| 684 | SourceLocation RParenLoc, StmtArg body) { |
| 685 | Stmt *First = static_cast<Stmt*>(first.get()); |
| 686 | Expr *Second = static_cast<Expr*>(second.get()); |
| 687 | Stmt *Body = static_cast<Stmt*>(body.get()); |
Fariborz Jahanian | 20552d2 | 2008-01-10 20:33:58 +0000 | [diff] [blame] | 688 | if (First) { |
| 689 | QualType FirstType; |
| 690 | if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { |
Chris Lattner | 7e24e82 | 2009-03-28 06:33:19 +0000 | [diff] [blame] | 691 | if (!DS->isSingleDecl()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 692 | return StmtError(Diag((*DS->decl_begin())->getLocation(), |
| 693 | diag::err_toomany_element_decls)); |
| 694 | |
Chris Lattner | 7e24e82 | 2009-03-28 06:33:19 +0000 | [diff] [blame] | 695 | Decl *D = DS->getSingleDecl(); |
Ted Kremenek | f34afee | 2008-10-06 20:58:11 +0000 | [diff] [blame] | 696 | FirstType = cast<ValueDecl>(D)->getType(); |
Chris Lattner | f3a41af | 2008-11-20 06:38:18 +0000 | [diff] [blame] | 697 | // C99 6.8.5p3: The declaration part of a 'for' statement shall only |
| 698 | // declare identifiers for objects having storage class 'auto' or |
| 699 | // 'register'. |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 700 | VarDecl *VD = cast<VarDecl>(D); |
| 701 | if (VD->isBlockVarDecl() && !VD->hasLocalStorage()) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 702 | return StmtError(Diag(VD->getLocation(), |
| 703 | diag::err_non_variable_decl_in_for)); |
Anders Carlsson | 1fe379f | 2008-08-25 18:16:36 +0000 | [diff] [blame] | 704 | } else { |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 705 | if (cast<Expr>(First)->isLvalue(Context) != Expr::LV_Valid) |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 706 | return StmtError(Diag(First->getLocStart(), |
| 707 | diag::err_selector_element_not_lvalue) |
| 708 | << First->getSourceRange()); |
| 709 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 710 | FirstType = static_cast<Expr*>(First)->getType(); |
Anders Carlsson | 1fe379f | 2008-08-25 18:16:36 +0000 | [diff] [blame] | 711 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 712 | if (!FirstType->isObjCObjectPointerType() && |
Fariborz Jahanian | a5e42a8 | 2009-08-14 21:53:27 +0000 | [diff] [blame] | 713 | !FirstType->isBlockPointerType()) |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 714 | Diag(ForLoc, diag::err_selector_element_type) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 715 | << FirstType << First->getSourceRange(); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 716 | } |
| 717 | if (Second) { |
| 718 | DefaultFunctionArrayConversion(Second); |
| 719 | QualType SecondType = Second->getType(); |
Steve Naroff | f495456 | 2009-07-16 15:41:00 +0000 | [diff] [blame] | 720 | if (!SecondType->isObjCObjectPointerType()) |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 721 | Diag(ForLoc, diag::err_collection_expr_type) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 722 | << SecondType << Second->getSourceRange(); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 723 | } |
Sebastian Redl | f05b152 | 2009-01-16 23:28:06 +0000 | [diff] [blame] | 724 | first.release(); |
| 725 | second.release(); |
| 726 | body.release(); |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 727 | return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, |
| 728 | ForLoc, RParenLoc)); |
Fariborz Jahanian | 3ba5a0f | 2008-01-03 17:55:25 +0000 | [diff] [blame] | 729 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 730 | |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 731 | Action::OwningStmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 732 | Sema::ActOnGotoStmt(SourceLocation GotoLoc, SourceLocation LabelLoc, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 733 | IdentifierInfo *LabelII) { |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 734 | // If we are in a block, reject all gotos for now. |
| 735 | if (CurBlock) |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 736 | return StmtError(Diag(GotoLoc, diag::err_goto_in_block)); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 737 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 738 | // Look up the record for this label identifier. |
Chris Lattner | ea29a3a | 2009-04-18 20:01:55 +0000 | [diff] [blame] | 739 | LabelStmt *&LabelDecl = getLabelMap()[LabelII]; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 740 | |
Steve Naroff | caaacec | 2009-03-13 15:38:40 +0000 | [diff] [blame] | 741 | // If we haven't seen this label yet, create a forward reference. |
| 742 | if (LabelDecl == 0) |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 743 | LabelDecl = new (Context) LabelStmt(LabelLoc, LabelII, 0); |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 744 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 745 | return Owned(new (Context) GotoStmt(LabelDecl, GotoLoc, LabelLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 746 | } |
| 747 | |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 748 | Action::OwningStmtResult |
Chris Lattner | ad56d68 | 2009-04-19 01:04:21 +0000 | [diff] [blame] | 749 | Sema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 750 | ExprArg DestExp) { |
Eli Friedman | bbf4623 | 2009-03-26 00:18:06 +0000 | [diff] [blame] | 751 | // Convert operand to void* |
Eli Friedman | 3308382 | 2009-03-26 07:32:37 +0000 | [diff] [blame] | 752 | Expr* E = DestExp.takeAs<Expr>(); |
Douglas Gregor | 5f1b9e6 | 2009-05-16 00:20:29 +0000 | [diff] [blame] | 753 | if (!E->isTypeDependent()) { |
| 754 | QualType ETy = E->getType(); |
| 755 | AssignConvertType ConvTy = |
| 756 | CheckSingleAssignmentConstraints(Context.VoidPtrTy, E); |
| 757 | if (DiagnoseAssignmentResult(ConvTy, StarLoc, Context.VoidPtrTy, ETy, |
| 758 | E, "passing")) |
| 759 | return StmtError(); |
| 760 | } |
| 761 | return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 762 | } |
| 763 | |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 764 | Action::OwningStmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 765 | Sema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 766 | Scope *S = CurScope->getContinueParent(); |
| 767 | if (!S) { |
| 768 | // 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] | 769 | return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 770 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 771 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 772 | return Owned(new (Context) ContinueStmt(ContinueLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 773 | } |
| 774 | |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 775 | Action::OwningStmtResult |
Steve Naroff | 1b273c4 | 2007-09-16 14:56:35 +0000 | [diff] [blame] | 776 | Sema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 777 | Scope *S = CurScope->getBreakParent(); |
| 778 | if (!S) { |
| 779 | // 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] | 780 | return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 781 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 782 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 783 | return Owned(new (Context) BreakStmt(BreakLoc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 784 | } |
| 785 | |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 786 | /// ActOnBlockReturnStmt - Utility routine to figure out block's return type. |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 787 | /// |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 788 | Action::OwningStmtResult |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 789 | Sema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 790 | // If this is the first return we've seen in the block, infer the type of |
| 791 | // the block from it. |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 792 | if (CurBlock->ReturnType.isNull()) { |
Steve Naroff | c50a4a5 | 2008-09-16 22:25:10 +0000 | [diff] [blame] | 793 | if (RetValExp) { |
Steve Naroff | 1656442 | 2008-09-24 22:26:48 +0000 | [diff] [blame] | 794 | // Don't call UsualUnaryConversions(), since we don't want to do |
| 795 | // integer promotions here. |
| 796 | DefaultFunctionArrayConversion(RetValExp); |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 797 | CurBlock->ReturnType = RetValExp->getType(); |
| 798 | if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { |
| 799 | // We have to remove a 'const' added to copied-in variable which was |
| 800 | // part of the implementation spec. and not the actual qualifier for |
| 801 | // the variable. |
| 802 | if (CDRE->isConstQualAdded()) |
| 803 | CurBlock->ReturnType.removeConst(); |
| 804 | } |
Steve Naroff | c50a4a5 | 2008-09-16 22:25:10 +0000 | [diff] [blame] | 805 | } else |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 806 | CurBlock->ReturnType = Context.VoidTy; |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 807 | } |
Fariborz Jahanian | 7d5c74e | 2009-06-19 23:37:08 +0000 | [diff] [blame] | 808 | QualType FnRetType = CurBlock->ReturnType; |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 809 | |
Argyrios Kyrtzidis | 40b598e | 2009-06-30 02:34:44 +0000 | [diff] [blame] | 810 | if (CurBlock->TheDecl->hasAttr<NoReturnAttr>()) { |
Mike Stump | 6c92fa7 | 2009-04-29 21:40:37 +0000 | [diff] [blame] | 811 | Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) |
| 812 | << getCurFunctionOrMethodDecl()->getDeclName(); |
| 813 | return StmtError(); |
| 814 | } |
| 815 | |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 816 | // Otherwise, verify that this result type matches the previous one. We are |
| 817 | // pickier with blocks than for normal functions because we don't have GCC |
| 818 | // compatibility to worry about here. |
| 819 | if (CurBlock->ReturnType->isVoidType()) { |
| 820 | if (RetValExp) { |
| 821 | Diag(ReturnLoc, diag::err_return_block_has_expr); |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 822 | RetValExp->Destroy(Context); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 823 | RetValExp = 0; |
| 824 | } |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 825 | return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 826 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 827 | |
| 828 | if (!RetValExp) |
| 829 | return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); |
| 830 | |
Mike Stump | 98eb8a7 | 2009-02-04 22:31:32 +0000 | [diff] [blame] | 831 | if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { |
| 832 | // we have a non-void block with an expression, continue checking |
| 833 | QualType RetValType = RetValExp->getType(); |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 834 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 835 | // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| 836 | // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
Mike Stump | 98eb8a7 | 2009-02-04 22:31:32 +0000 | [diff] [blame] | 837 | // function return. |
| 838 | |
| 839 | // In C++ the return statement is handled via a copy initialization. |
| 840 | // the C version of which boils down to CheckSingleAssignmentConstraints. |
| 841 | // FIXME: Leaks RetValExp. |
| 842 | if (PerformCopyInitialization(RetValExp, FnRetType, "returning")) |
| 843 | return StmtError(); |
| 844 | |
| 845 | if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 846 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 847 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 848 | return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 849 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 850 | |
Sebastian Redl | e2b6833 | 2009-04-12 17:16:29 +0000 | [diff] [blame] | 851 | /// IsReturnCopyElidable - Whether returning @p RetExpr from a function that |
| 852 | /// returns a @p RetType fulfills the criteria for copy elision (C++0x 12.8p15). |
| 853 | static bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType, |
| 854 | Expr *RetExpr) { |
| 855 | QualType ExprType = RetExpr->getType(); |
| 856 | // - in a return statement in a function with ... |
| 857 | // ... a class return type ... |
| 858 | if (!RetType->isRecordType()) |
| 859 | return false; |
| 860 | // ... the same cv-unqualified type as the function return type ... |
| 861 | if (Ctx.getCanonicalType(RetType).getUnqualifiedType() != |
| 862 | Ctx.getCanonicalType(ExprType).getUnqualifiedType()) |
| 863 | return false; |
| 864 | // ... the expression is the name of a non-volatile automatic object ... |
| 865 | // We ignore parentheses here. |
| 866 | // FIXME: Is this compliant? |
| 867 | const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(RetExpr->IgnoreParens()); |
| 868 | if (!DR) |
| 869 | return false; |
| 870 | const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); |
| 871 | if (!VD) |
| 872 | return false; |
| 873 | return VD->hasLocalStorage() && !VD->getType()->isReferenceType() |
| 874 | && !VD->getType().isVolatileQualified(); |
| 875 | } |
| 876 | |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 877 | Action::OwningStmtResult |
Anders Carlsson | f53b443 | 2009-08-18 16:11:00 +0000 | [diff] [blame] | 878 | Sema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) { |
| 879 | Expr *RetValExp = rex.takeAs<Expr>(); |
Steve Naroff | 4eb206b | 2008-09-03 18:15:37 +0000 | [diff] [blame] | 880 | if (CurBlock) |
| 881 | return ActOnBlockReturnStmt(ReturnLoc, RetValExp); |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 882 | |
Chris Lattner | 371f258 | 2008-12-04 23:50:19 +0000 | [diff] [blame] | 883 | QualType FnRetType; |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 884 | if (const FunctionDecl *FD = getCurFunctionDecl()) { |
Chris Lattner | 371f258 | 2008-12-04 23:50:19 +0000 | [diff] [blame] | 885 | FnRetType = FD->getResultType(); |
Argyrios Kyrtzidis | 40b598e | 2009-06-30 02:34:44 +0000 | [diff] [blame] | 886 | if (FD->hasAttr<NoReturnAttr>()) |
Chris Lattner | 8662587 | 2009-05-31 19:32:13 +0000 | [diff] [blame] | 887 | Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 888 | << getCurFunctionOrMethodDecl()->getDeclName(); |
Mike Stump | f7c41da | 2009-04-29 00:43:21 +0000 | [diff] [blame] | 889 | } else if (ObjCMethodDecl *MD = getCurMethodDecl()) |
Steve Naroff | c97fb9a | 2009-03-03 00:45:38 +0000 | [diff] [blame] | 890 | FnRetType = MD->getResultType(); |
| 891 | else // If we don't have a function/method context, bail. |
| 892 | return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 893 | |
Chris Lattner | 5cf216b | 2008-01-04 18:04:52 +0000 | [diff] [blame] | 894 | if (FnRetType->isVoidType()) { |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 895 | if (RetValExp) {// C99 6.8.6.4p1 (ext_ since GCC warns) |
Chris Lattner | 65ce04b | 2008-12-18 02:01:17 +0000 | [diff] [blame] | 896 | unsigned D = diag::ext_return_has_expr; |
| 897 | if (RetValExp->getType()->isVoidType()) |
| 898 | D = diag::ext_return_has_void_expr; |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 899 | |
Chris Lattner | e878eb0 | 2008-12-18 02:03:48 +0000 | [diff] [blame] | 900 | // return (some void expression); is legal in C++. |
| 901 | if (D != diag::ext_return_has_void_expr || |
| 902 | !getLangOptions().CPlusPlus) { |
| 903 | NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); |
| 904 | Diag(ReturnLoc, D) |
| 905 | << CurDecl->getDeclName() << isa<ObjCMethodDecl>(CurDecl) |
| 906 | << RetValExp->getSourceRange(); |
| 907 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 908 | |
Anders Carlsson | f53b443 | 2009-08-18 16:11:00 +0000 | [diff] [blame] | 909 | RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 910 | } |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 911 | return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 912 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 913 | |
Anders Carlsson | 03d7776 | 2009-05-15 00:48:27 +0000 | [diff] [blame] | 914 | if (!RetValExp && !FnRetType->isDependentType()) { |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 915 | unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 |
| 916 | // C99 6.8.6.4p1 (ext_ since GCC warns) |
| 917 | if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; |
| 918 | |
| 919 | if (FunctionDecl *FD = getCurFunctionDecl()) |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 920 | Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 921 | else |
Chris Lattner | 08631c5 | 2008-11-23 21:45:46 +0000 | [diff] [blame] | 922 | Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 923 | return Owned(new (Context) ReturnStmt(ReturnLoc, (Expr*)0)); |
Chris Lattner | 3c73c41 | 2008-11-19 08:23:25 +0000 | [diff] [blame] | 924 | } |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 925 | |
Douglas Gregor | 898574e | 2008-12-05 23:32:09 +0000 | [diff] [blame] | 926 | if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { |
| 927 | // we have a non-void function with an expression, continue checking |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 928 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 929 | // C99 6.8.6.4p3(136): The return statement is not an assignment. The |
| 930 | // overlap restriction of subclause 6.5.16.1 does not apply to the case of |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 931 | // function return. |
| 932 | |
Sebastian Redl | e2b6833 | 2009-04-12 17:16:29 +0000 | [diff] [blame] | 933 | // C++0x 12.8p15: When certain criteria are met, an implementation is |
| 934 | // allowed to omit the copy construction of a class object, [...] |
| 935 | // - in a return statement in a function with a class return type, when |
| 936 | // the expression is the name of a non-volatile automatic object with |
| 937 | // the same cv-unqualified type as the function return type, the copy |
| 938 | // operation can be omitted [...] |
| 939 | // C++0x 12.8p16: When the criteria for elision of a copy operation are met |
| 940 | // and the object to be copied is designated by an lvalue, overload |
| 941 | // resolution to select the constructor for the copy is first performed |
| 942 | // as if the object were designated by an rvalue. |
| 943 | // Note that we only compute Elidable if we're in C++0x, since we don't |
| 944 | // care otherwise. |
| 945 | bool Elidable = getLangOptions().CPlusPlus0x ? |
| 946 | IsReturnCopyElidable(Context, FnRetType, RetValExp) : |
| 947 | false; |
| 948 | |
Douglas Gregor | 898574e | 2008-12-05 23:32:09 +0000 | [diff] [blame] | 949 | // In C++ the return statement is handled via a copy initialization. |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 950 | // the C version of which boils down to CheckSingleAssignmentConstraints. |
Sebastian Redl | e2b6833 | 2009-04-12 17:16:29 +0000 | [diff] [blame] | 951 | // FIXME: Leaks RetValExp on error. |
| 952 | if (PerformCopyInitialization(RetValExp, FnRetType, "returning", Elidable)) |
Sebastian Redl | 4cffe2f | 2009-01-18 13:19:59 +0000 | [diff] [blame] | 953 | return StmtError(); |
| 954 | |
Douglas Gregor | 898574e | 2008-12-05 23:32:09 +0000 | [diff] [blame] | 955 | if (RetValExp) CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); |
| 956 | } |
| 957 | |
Anders Carlsson | f53b443 | 2009-08-18 16:11:00 +0000 | [diff] [blame] | 958 | if (RetValExp) |
| 959 | RetValExp = MaybeCreateCXXExprWithTemporaries(RetValExp, true); |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 960 | return Owned(new (Context) ReturnStmt(ReturnLoc, RetValExp)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 961 | } |
| 962 | |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 963 | /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently |
| 964 | /// ignore "noop" casts in places where an lvalue is required by an inline asm. |
| 965 | /// We emulate this behavior when -fheinous-gnu-extensions is specified, but |
| 966 | /// provide a strong guidance to not use it. |
| 967 | /// |
| 968 | /// This method checks to see if the argument is an acceptable l-value and |
| 969 | /// returns false if it is a case we can handle. |
| 970 | static bool CheckAsmLValue(const Expr *E, Sema &S) { |
| 971 | if (E->isLvalue(S.Context) == Expr::LV_Valid) |
| 972 | return false; // Cool, this is an lvalue. |
| 973 | |
| 974 | // Okay, this is not an lvalue, but perhaps it is the result of a cast that we |
| 975 | // are supposed to allow. |
| 976 | const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); |
| 977 | if (E != E2 && E2->isLvalue(S.Context) == Expr::LV_Valid) { |
| 978 | if (!S.getLangOptions().HeinousExtensions) |
| 979 | S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) |
| 980 | << E->getSourceRange(); |
| 981 | else |
| 982 | S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) |
| 983 | << E->getSourceRange(); |
| 984 | // Accept, even if we emitted an error diagnostic. |
| 985 | return false; |
| 986 | } |
| 987 | |
| 988 | // None of the above, just randomly invalid non-lvalue. |
| 989 | return true; |
| 990 | } |
| 991 | |
| 992 | |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 993 | Sema::OwningStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, |
| 994 | bool IsSimple, |
| 995 | bool IsVolatile, |
| 996 | unsigned NumOutputs, |
| 997 | unsigned NumInputs, |
| 998 | std::string *Names, |
| 999 | MultiExprArg constraints, |
| 1000 | MultiExprArg exprs, |
| 1001 | ExprArg asmString, |
| 1002 | MultiExprArg clobbers, |
| 1003 | SourceLocation RParenLoc) { |
| 1004 | unsigned NumClobbers = clobbers.size(); |
| 1005 | StringLiteral **Constraints = |
| 1006 | reinterpret_cast<StringLiteral**>(constraints.get()); |
| 1007 | Expr **Exprs = reinterpret_cast<Expr **>(exprs.get()); |
| 1008 | StringLiteral *AsmString = cast<StringLiteral>((Expr *)asmString.get()); |
| 1009 | StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); |
| 1010 | |
Anders Carlsson | 03eb543 | 2009-01-27 20:38:24 +0000 | [diff] [blame] | 1011 | llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1012 | |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1013 | // The parser verifies that there is a string literal here. |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1014 | if (AsmString->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1015 | return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) |
| 1016 | << AsmString->getSourceRange()); |
| 1017 | |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1018 | for (unsigned i = 0; i != NumOutputs; i++) { |
| 1019 | StringLiteral *Literal = Constraints[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1020 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1021 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1022 | << Literal->getSourceRange()); |
| 1023 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1024 | TargetInfo::ConstraintInfo Info(Literal->getStrData(), |
Chris Lattner | 2819fa8 | 2009-04-26 17:57:12 +0000 | [diff] [blame] | 1025 | Literal->getByteLength(), |
| 1026 | Names[i]); |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1027 | if (!Context.Target.validateOutputConstraint(Info)) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1028 | return StmtError(Diag(Literal->getLocStart(), |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1029 | diag::err_asm_invalid_output_constraint) |
| 1030 | << Info.getConstraintStr()); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1031 | |
Anders Carlsson | d04c6e2 | 2007-11-27 04:11:28 +0000 | [diff] [blame] | 1032 | // Check that the output exprs are valid lvalues. |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1033 | Expr *OutputExpr = Exprs[i]; |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1034 | if (CheckAsmLValue(OutputExpr, *this)) { |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1035 | return StmtError(Diag(OutputExpr->getLocStart(), |
Chris Lattner | dcd5ef1 | 2008-11-19 05:27:50 +0000 | [diff] [blame] | 1036 | diag::err_asm_invalid_lvalue_in_output) |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1037 | << OutputExpr->getSourceRange()); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1038 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1039 | |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1040 | OutputConstraintInfos.push_back(Info); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1041 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1042 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1043 | llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; |
| 1044 | |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1045 | for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1046 | StringLiteral *Literal = Constraints[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1047 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1048 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1049 | << Literal->getSourceRange()); |
| 1050 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1051 | TargetInfo::ConstraintInfo Info(Literal->getStrData(), |
Chris Lattner | 2819fa8 | 2009-04-26 17:57:12 +0000 | [diff] [blame] | 1052 | Literal->getByteLength(), |
| 1053 | Names[i]); |
Jay Foad | beaaccd | 2009-05-21 09:52:38 +0000 | [diff] [blame] | 1054 | if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), |
Chris Lattner | 2819fa8 | 2009-04-26 17:57:12 +0000 | [diff] [blame] | 1055 | NumOutputs, Info)) { |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1056 | return StmtError(Diag(Literal->getLocStart(), |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1057 | diag::err_asm_invalid_input_constraint) |
| 1058 | << Info.getConstraintStr()); |
Anders Carlsson | d04c6e2 | 2007-11-27 04:11:28 +0000 | [diff] [blame] | 1059 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1060 | |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1061 | Expr *InputExpr = Exprs[i]; |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1062 | |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1063 | // Only allow void types for memory constraints. |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1064 | if (Info.allowsMemory() && !Info.allowsRegister()) { |
Chris Lattner | 810f6d5 | 2009-03-13 17:38:01 +0000 | [diff] [blame] | 1065 | if (CheckAsmLValue(InputExpr, *this)) |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1066 | return StmtError(Diag(InputExpr->getLocStart(), |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1067 | diag::err_asm_invalid_lvalue_in_input) |
Chris Lattner | 432c869 | 2009-04-26 17:19:08 +0000 | [diff] [blame] | 1068 | << Info.getConstraintStr() |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1069 | << InputExpr->getSourceRange()); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1070 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1071 | |
Chris Lattner | 44def07 | 2009-04-26 07:16:29 +0000 | [diff] [blame] | 1072 | if (Info.allowsRegister()) { |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1073 | if (InputExpr->getType()->isVoidType()) { |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1074 | return StmtError(Diag(InputExpr->getLocStart(), |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1075 | diag::err_asm_invalid_type_in_input) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1076 | << InputExpr->getType() << Info.getConstraintStr() |
Eli Friedman | 72056a2 | 2009-05-03 07:49:42 +0000 | [diff] [blame] | 1077 | << InputExpr->getSourceRange()); |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1078 | } |
Anders Carlsson | d9fca6e | 2009-01-20 20:49:22 +0000 | [diff] [blame] | 1079 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1080 | |
Anders Carlsson | 6032979 | 2009-02-22 02:11:23 +0000 | [diff] [blame] | 1081 | DefaultFunctionArrayConversion(Exprs[i]); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1082 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1083 | InputConstraintInfos.push_back(Info); |
Anders Carlsson | 04728b7 | 2007-11-23 19:43:50 +0000 | [diff] [blame] | 1084 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1085 | |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 1086 | // Check that the clobbers are valid. |
Chris Lattner | 1708b96 | 2008-08-18 19:55:17 +0000 | [diff] [blame] | 1087 | for (unsigned i = 0; i != NumClobbers; i++) { |
| 1088 | StringLiteral *Literal = Clobbers[i]; |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1089 | if (Literal->isWide()) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1090 | return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) |
| 1091 | << Literal->getSourceRange()); |
| 1092 | |
Daniel Dunbar | 7765934 | 2009-08-19 20:04:03 +0000 | [diff] [blame] | 1093 | std::string Clobber(Literal->getStrData(), |
| 1094 | Literal->getStrData() + |
| 1095 | Literal->getByteLength()); |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1096 | |
Chris Lattner | 6bc5211 | 2008-07-23 06:46:56 +0000 | [diff] [blame] | 1097 | if (!Context.Target.isValidGCCRegisterName(Clobber.c_str())) |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1098 | return StmtError(Diag(Literal->getLocStart(), |
Daniel Dunbar | 7765934 | 2009-08-19 20:04:03 +0000 | [diff] [blame] | 1099 | diag::err_asm_unknown_register_name) << Clobber); |
Anders Carlsson | 6fa9086 | 2007-11-25 00:25:21 +0000 | [diff] [blame] | 1100 | } |
Sebastian Redl | 3037ed0 | 2009-01-18 16:53:17 +0000 | [diff] [blame] | 1101 | |
| 1102 | constraints.release(); |
| 1103 | exprs.release(); |
| 1104 | asmString.release(); |
| 1105 | clobbers.release(); |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1106 | AsmStmt *NS = |
| 1107 | new (Context) AsmStmt(AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, |
| 1108 | Names, Constraints, Exprs, AsmString, NumClobbers, |
| 1109 | Clobbers, RParenLoc); |
| 1110 | // Validate the asm string, ensuring it makes sense given the operands we |
| 1111 | // have. |
| 1112 | llvm::SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; |
| 1113 | unsigned DiagOffs; |
| 1114 | if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { |
Chris Lattner | 2ff0f42 | 2009-03-10 23:57:07 +0000 | [diff] [blame] | 1115 | Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) |
| 1116 | << AsmString->getSourceRange(); |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1117 | DeleteStmt(NS); |
| 1118 | return StmtError(); |
| 1119 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1120 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1121 | // Validate tied input operands for type mismatches. |
| 1122 | for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { |
| 1123 | TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1124 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1125 | // If this is a tied constraint, verify that the output and input have |
| 1126 | // either exactly the same type, or that they are int/ptr operands with the |
| 1127 | // same size (int/long, int*/long, are ok etc). |
| 1128 | if (!Info.hasTiedOperand()) continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1129 | |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1130 | unsigned TiedTo = Info.getTiedOperand(); |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 1131 | Expr *OutputExpr = Exprs[TiedTo]; |
Chris Lattner | c1f3b28 | 2009-05-03 06:50:40 +0000 | [diff] [blame] | 1132 | Expr *InputExpr = Exprs[i+NumOutputs]; |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 1133 | QualType InTy = InputExpr->getType(); |
| 1134 | QualType OutTy = OutputExpr->getType(); |
| 1135 | if (Context.hasSameType(InTy, OutTy)) |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1136 | continue; // All types can be tied to themselves. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1137 | |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 1138 | // Int/ptr operands have some special cases that we allow. |
| 1139 | if ((OutTy->isIntegerType() || OutTy->isPointerType()) && |
| 1140 | (InTy->isIntegerType() || InTy->isPointerType())) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1141 | |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 1142 | // They are ok if they are the same size. Tying void* to int is ok if |
| 1143 | // they are the same size, for example. This also allows tying void* to |
| 1144 | // int*. |
Chris Lattner | 3351f11 | 2009-05-03 08:32:32 +0000 | [diff] [blame] | 1145 | uint64_t OutSize = Context.getTypeSize(OutTy); |
| 1146 | uint64_t InSize = Context.getTypeSize(InTy); |
| 1147 | if (OutSize == InSize) |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1148 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1149 | |
Chris Lattner | 3351f11 | 2009-05-03 08:32:32 +0000 | [diff] [blame] | 1150 | // If the smaller input/output operand is not mentioned in the asm string, |
| 1151 | // then we can promote it and the asm string won't notice. Check this |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 1152 | // case now. |
Chris Lattner | 3351f11 | 2009-05-03 08:32:32 +0000 | [diff] [blame] | 1153 | bool SmallerValueMentioned = false; |
Chris Lattner | 58bce89 | 2009-05-03 08:24:16 +0000 | [diff] [blame] | 1154 | for (unsigned p = 0, e = Pieces.size(); p != e; ++p) { |
| 1155 | AsmStmt::AsmStringPiece &Piece = Pieces[p]; |
| 1156 | if (!Piece.isOperand()) continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1157 | |
Chris Lattner | 3351f11 | 2009-05-03 08:32:32 +0000 | [diff] [blame] | 1158 | // If this is a reference to the input and if the input was the smaller |
| 1159 | // one, then we have to reject this asm. |
| 1160 | if (Piece.getOperandNo() == i+NumOutputs) { |
| 1161 | if (InSize < OutSize) { |
| 1162 | SmallerValueMentioned = true; |
| 1163 | break; |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | // If this is a reference to the input and if the input was the smaller |
| 1168 | // one, then we have to reject this asm. |
| 1169 | if (Piece.getOperandNo() == TiedTo) { |
| 1170 | if (InSize > OutSize) { |
| 1171 | SmallerValueMentioned = true; |
| 1172 | break; |
| 1173 | } |
| 1174 | } |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 1175 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1176 | |
Chris Lattner | 3351f11 | 2009-05-03 08:32:32 +0000 | [diff] [blame] | 1177 | // If the smaller value wasn't mentioned in the asm string, and if the |
| 1178 | // output was a register, just extend the shorter one to the size of the |
| 1179 | // larger one. |
| 1180 | if (!SmallerValueMentioned && |
Chris Lattner | f69fcae | 2009-05-03 07:04:21 +0000 | [diff] [blame] | 1181 | OutputConstraintInfos[TiedTo].allowsRegister()) |
| 1182 | continue; |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1183 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1184 | |
Chris Lattner | c1f3b28 | 2009-05-03 06:50:40 +0000 | [diff] [blame] | 1185 | Diag(InputExpr->getLocStart(), |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1186 | diag::err_asm_tying_incompatible_types) |
Chris Lattner | 7adaa18 | 2009-05-03 05:59:17 +0000 | [diff] [blame] | 1187 | << InTy << OutTy << OutputExpr->getSourceRange() |
Chris Lattner | 806503f | 2009-05-03 05:55:43 +0000 | [diff] [blame] | 1188 | << InputExpr->getSourceRange(); |
| 1189 | DeleteStmt(NS); |
| 1190 | return StmtError(); |
| 1191 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1192 | |
Chris Lattner | fb5058e | 2009-03-10 23:41:04 +0000 | [diff] [blame] | 1193 | return Owned(NS); |
Chris Lattner | fe79595 | 2007-10-29 04:04:16 +0000 | [diff] [blame] | 1194 | } |
Fariborz Jahanian | 3b1191d | 2007-11-01 23:59:59 +0000 | [diff] [blame] | 1195 | |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1196 | Action::OwningStmtResult |
| 1197 | Sema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, |
Chris Lattner | b28317a | 2009-03-28 19:18:32 +0000 | [diff] [blame] | 1198 | SourceLocation RParen, DeclPtrTy Parm, |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1199 | StmtArg Body, StmtArg catchList) { |
Anders Carlsson | f1b1d59 | 2009-05-01 19:30:39 +0000 | [diff] [blame] | 1200 | Stmt *CatchList = catchList.takeAs<Stmt>(); |
Chris Lattner | b28317a | 2009-03-28 19:18:32 +0000 | [diff] [blame] | 1201 | ParmVarDecl *PVD = cast_or_null<ParmVarDecl>(Parm.getAs<Decl>()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1202 | |
Steve Naroff | f50cb36 | 2009-03-03 20:59:06 +0000 | [diff] [blame] | 1203 | // PVD == 0 implies @catch(...). |
Steve Naroff | 9d40ee5 | 2009-03-03 21:16:54 +0000 | [diff] [blame] | 1204 | if (PVD) { |
Chris Lattner | 93c4945 | 2009-04-12 23:26:56 +0000 | [diff] [blame] | 1205 | // If we already know the decl is invalid, reject it. |
| 1206 | if (PVD->isInvalidDecl()) |
| 1207 | return StmtError(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1208 | |
Steve Naroff | f495456 | 2009-07-16 15:41:00 +0000 | [diff] [blame] | 1209 | if (!PVD->getType()->isObjCObjectPointerType()) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1210 | return StmtError(Diag(PVD->getLocation(), |
Steve Naroff | 9d40ee5 | 2009-03-03 21:16:54 +0000 | [diff] [blame] | 1211 | diag::err_catch_param_not_objc_type)); |
| 1212 | if (PVD->getType()->isObjCQualifiedIdType()) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1213 | return StmtError(Diag(PVD->getLocation(), |
Steve Naroff | d198aba | 2009-03-03 23:13:51 +0000 | [diff] [blame] | 1214 | diag::err_illegal_qualifiers_on_catch_parm)); |
Steve Naroff | 9d40ee5 | 2009-03-03 21:16:54 +0000 | [diff] [blame] | 1215 | } |
Chris Lattner | 93c4945 | 2009-04-12 23:26:56 +0000 | [diff] [blame] | 1216 | |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1217 | ObjCAtCatchStmt *CS = new (Context) ObjCAtCatchStmt(AtLoc, RParen, |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 1218 | PVD, Body.takeAs<Stmt>(), CatchList); |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1219 | return Owned(CatchList ? CatchList : CS); |
Fariborz Jahanian | 3b1191d | 2007-11-01 23:59:59 +0000 | [diff] [blame] | 1220 | } |
| 1221 | |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1222 | Action::OwningStmtResult |
| 1223 | Sema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) { |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1224 | return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, |
| 1225 | static_cast<Stmt*>(Body.release()))); |
Fariborz Jahanian | 161a9c5 | 2007-11-02 00:18:53 +0000 | [diff] [blame] | 1226 | } |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 1227 | |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1228 | Action::OwningStmtResult |
| 1229 | Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc, |
| 1230 | StmtArg Try, StmtArg Catch, StmtArg Finally) { |
Chris Lattner | 38c5ebd | 2009-04-19 05:21:20 +0000 | [diff] [blame] | 1231 | CurFunctionNeedsScopeChecking = true; |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 1232 | return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(), |
| 1233 | Catch.takeAs<Stmt>(), |
| 1234 | Finally.takeAs<Stmt>())); |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 1235 | } |
| 1236 | |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1237 | Action::OwningStmtResult |
Steve Naroff | 3dcfe10 | 2009-02-12 15:54:59 +0000 | [diff] [blame] | 1238 | Sema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) { |
Anders Carlsson | f1b1d59 | 2009-05-01 19:30:39 +0000 | [diff] [blame] | 1239 | Expr *ThrowExpr = expr.takeAs<Expr>(); |
Steve Naroff | 7151bbb | 2009-02-11 17:45:08 +0000 | [diff] [blame] | 1240 | if (!ThrowExpr) { |
Steve Naroff | e21dd6f | 2009-02-11 20:05:44 +0000 | [diff] [blame] | 1241 | // @throw without an expression designates a rethrow (which much occur |
| 1242 | // in the context of an @catch clause). |
| 1243 | Scope *AtCatchParent = CurScope; |
| 1244 | while (AtCatchParent && !AtCatchParent->isAtCatchScope()) |
| 1245 | AtCatchParent = AtCatchParent->getParent(); |
| 1246 | if (!AtCatchParent) |
Steve Naroff | 4ab2414 | 2009-02-12 18:09:32 +0000 | [diff] [blame] | 1247 | return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); |
Steve Naroff | 7151bbb | 2009-02-11 17:45:08 +0000 | [diff] [blame] | 1248 | } else { |
| 1249 | QualType ThrowType = ThrowExpr->getType(); |
| 1250 | // Make sure the expression type is an ObjC pointer or "void *". |
Steve Naroff | f495456 | 2009-07-16 15:41:00 +0000 | [diff] [blame] | 1251 | if (!ThrowType->isObjCObjectPointerType()) { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 1252 | const PointerType *PT = ThrowType->getAs<PointerType>(); |
Steve Naroff | 7151bbb | 2009-02-11 17:45:08 +0000 | [diff] [blame] | 1253 | if (!PT || !PT->getPointeeType()->isVoidType()) |
Steve Naroff | 4ab2414 | 2009-02-12 18:09:32 +0000 | [diff] [blame] | 1254 | return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) |
| 1255 | << ThrowExpr->getType() << ThrowExpr->getSourceRange()); |
Steve Naroff | 7151bbb | 2009-02-11 17:45:08 +0000 | [diff] [blame] | 1256 | } |
| 1257 | } |
| 1258 | return Owned(new (Context) ObjCAtThrowStmt(AtLoc, ThrowExpr)); |
Fariborz Jahanian | 39f8f15 | 2007-11-07 02:00:49 +0000 | [diff] [blame] | 1259 | } |
Fariborz Jahanian | bd49a64 | 2007-11-02 15:39:31 +0000 | [diff] [blame] | 1260 | |
Sebastian Redl | 431e90e | 2009-01-18 17:43:11 +0000 | [diff] [blame] | 1261 | Action::OwningStmtResult |
| 1262 | Sema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr, |
| 1263 | StmtArg SynchBody) { |
Chris Lattner | 46c3c4b | 2009-04-21 06:01:00 +0000 | [diff] [blame] | 1264 | CurFunctionNeedsScopeChecking = true; |
| 1265 | |
Chris Lattner | a868a20 | 2009-04-21 06:11:25 +0000 | [diff] [blame] | 1266 | // Make sure the expression type is an ObjC pointer or "void *". |
| 1267 | Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get()); |
Steve Naroff | f495456 | 2009-07-16 15:41:00 +0000 | [diff] [blame] | 1268 | if (!SyncExpr->getType()->isObjCObjectPointerType()) { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 1269 | const PointerType *PT = SyncExpr->getType()->getAs<PointerType>(); |
Chris Lattner | a868a20 | 2009-04-21 06:11:25 +0000 | [diff] [blame] | 1270 | if (!PT || !PT->getPointeeType()->isVoidType()) |
| 1271 | return StmtError(Diag(AtLoc, diag::error_objc_synchronized_expects_object) |
| 1272 | << SyncExpr->getType() << SyncExpr->getSourceRange()); |
| 1273 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1274 | |
| 1275 | return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 1276 | SynchExpr.takeAs<Stmt>(), |
| 1277 | SynchBody.takeAs<Stmt>())); |
Fariborz Jahanian | fa3ee8e | 2008-01-29 19:14:59 +0000 | [diff] [blame] | 1278 | } |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 1279 | |
| 1280 | /// ActOnCXXCatchBlock - Takes an exception declaration and a handler block |
| 1281 | /// and creates a proper catch handler from them. |
| 1282 | Action::OwningStmtResult |
Chris Lattner | b28317a | 2009-03-28 19:18:32 +0000 | [diff] [blame] | 1283 | Sema::ActOnCXXCatchBlock(SourceLocation CatchLoc, DeclPtrTy ExDecl, |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 1284 | StmtArg HandlerBlock) { |
| 1285 | // There's nothing to test that ActOnExceptionDecl didn't already test. |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1286 | return Owned(new (Context) CXXCatchStmt(CatchLoc, |
Chris Lattner | b28317a | 2009-03-28 19:18:32 +0000 | [diff] [blame] | 1287 | cast_or_null<VarDecl>(ExDecl.getAs<Decl>()), |
Anders Carlsson | e9146f2 | 2009-05-01 19:49:17 +0000 | [diff] [blame] | 1288 | HandlerBlock.takeAs<Stmt>())); |
Sebastian Redl | 4b07b29 | 2008-12-22 19:15:10 +0000 | [diff] [blame] | 1289 | } |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1290 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1291 | class TypeWithHandler { |
| 1292 | QualType t; |
| 1293 | CXXCatchStmt *stmt; |
| 1294 | public: |
| 1295 | TypeWithHandler(const QualType &type, CXXCatchStmt *statement) |
| 1296 | : t(type), stmt(statement) {} |
| 1297 | |
| 1298 | bool operator<(const TypeWithHandler &y) const { |
| 1299 | if (t.getTypePtr() < y.t.getTypePtr()) |
| 1300 | return true; |
| 1301 | else if (t.getTypePtr() > y.t.getTypePtr()) |
| 1302 | return false; |
| 1303 | else if (t.getCVRQualifiers() < y.t.getCVRQualifiers()) |
| 1304 | return true; |
| 1305 | else if (t.getCVRQualifiers() < y.t.getCVRQualifiers()) |
| 1306 | return false; |
| 1307 | else |
| 1308 | return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); |
| 1309 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1310 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1311 | bool operator==(const TypeWithHandler& other) const { |
| 1312 | return t.getTypePtr() == other.t.getTypePtr() |
| 1313 | && t.getCVRQualifiers() == other.t.getCVRQualifiers(); |
| 1314 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1315 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1316 | QualType getQualType() const { return t; } |
| 1317 | CXXCatchStmt *getCatchStmt() const { return stmt; } |
| 1318 | SourceLocation getTypeSpecStartLoc() const { |
| 1319 | return stmt->getExceptionDecl()->getTypeSpecStartLoc(); |
| 1320 | } |
| 1321 | }; |
| 1322 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1323 | /// ActOnCXXTryBlock - Takes a try compound-statement and a number of |
| 1324 | /// handlers and creates a try statement from them. |
| 1325 | Action::OwningStmtResult |
| 1326 | Sema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock, |
| 1327 | MultiStmtArg RawHandlers) { |
| 1328 | unsigned NumHandlers = RawHandlers.size(); |
| 1329 | assert(NumHandlers > 0 && |
| 1330 | "The parser shouldn't call this if there are no handlers."); |
| 1331 | Stmt **Handlers = reinterpret_cast<Stmt**>(RawHandlers.get()); |
| 1332 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1333 | llvm::SmallVector<TypeWithHandler, 8> TypesWithHandlers; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1334 | |
| 1335 | for (unsigned i = 0; i < NumHandlers; ++i) { |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1336 | CXXCatchStmt *Handler = llvm::cast<CXXCatchStmt>(Handlers[i]); |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1337 | if (!Handler->getExceptionDecl()) { |
| 1338 | if (i < NumHandlers - 1) |
| 1339 | return StmtError(Diag(Handler->getLocStart(), |
| 1340 | diag::err_early_catch_all)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1341 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1342 | continue; |
| 1343 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1344 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1345 | const QualType CaughtType = Handler->getCaughtType(); |
| 1346 | const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); |
| 1347 | TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1348 | } |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1349 | |
| 1350 | // Detect handlers for the same type as an earlier one. |
| 1351 | if (NumHandlers > 1) { |
| 1352 | llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1353 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1354 | TypeWithHandler prev = TypesWithHandlers[0]; |
| 1355 | for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { |
| 1356 | TypeWithHandler curr = TypesWithHandlers[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1357 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1358 | if (curr == prev) { |
| 1359 | Diag(curr.getTypeSpecStartLoc(), |
| 1360 | diag::warn_exception_caught_by_earlier_handler) |
| 1361 | << curr.getCatchStmt()->getCaughtType().getAsString(); |
| 1362 | Diag(prev.getTypeSpecStartLoc(), |
| 1363 | diag::note_previous_exception_handler) |
| 1364 | << prev.getCatchStmt()->getCaughtType().getAsString(); |
| 1365 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1366 | |
Sebastian Redl | c447aba | 2009-07-29 17:15:45 +0000 | [diff] [blame] | 1367 | prev = curr; |
| 1368 | } |
| 1369 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1370 | |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1371 | // FIXME: We should detect handlers that cannot catch anything because an |
| 1372 | // earlier handler catches a superclass. Need to find a method that is not |
| 1373 | // quadratic for this. |
| 1374 | // Neither of these are explicitly forbidden, but every compiler detects them |
| 1375 | // and warns. |
| 1376 | |
Sebastian Redl | 972041f | 2009-04-27 20:27:31 +0000 | [diff] [blame] | 1377 | CurFunctionNeedsScopeChecking = true; |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1378 | RawHandlers.release(); |
Ted Kremenek | 8189cde | 2009-02-07 01:47:29 +0000 | [diff] [blame] | 1379 | return Owned(new (Context) CXXTryStmt(TryLoc, |
| 1380 | static_cast<Stmt*>(TryBlock.release()), |
| 1381 | Handlers, NumHandlers)); |
Sebastian Redl | 8351da0 | 2008-12-22 21:35:02 +0000 | [diff] [blame] | 1382 | } |