Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1 | //===--- SemaOverload.cpp - C++ Overloading ---------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file provides Sema routines for C++ overloading. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "Sema.h" |
Douglas Gregor | 94b1dd2 | 2008-10-24 04:54:22 +0000 | [diff] [blame] | 15 | #include "SemaInherit.h" |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 16 | #include "clang/Basic/Diagnostic.h" |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 17 | #include "clang/Lex/Preprocessor.h" |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 18 | #include "clang/AST/ASTContext.h" |
| 19 | #include "clang/AST/Expr.h" |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 20 | #include "clang/AST/ExprCXX.h" |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 21 | #include "clang/AST/TypeOrdering.h" |
Douglas Gregor | bf3af05 | 2008-11-13 20:12:29 +0000 | [diff] [blame] | 22 | #include "llvm/ADT/SmallPtrSet.h" |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 23 | #include "llvm/Support/Compiler.h" |
| 24 | #include <algorithm> |
| 25 | |
| 26 | namespace clang { |
| 27 | |
| 28 | /// GetConversionCategory - Retrieve the implicit conversion |
| 29 | /// category corresponding to the given implicit conversion kind. |
| 30 | ImplicitConversionCategory |
| 31 | GetConversionCategory(ImplicitConversionKind Kind) { |
| 32 | static const ImplicitConversionCategory |
| 33 | Category[(int)ICK_Num_Conversion_Kinds] = { |
| 34 | ICC_Identity, |
| 35 | ICC_Lvalue_Transformation, |
| 36 | ICC_Lvalue_Transformation, |
| 37 | ICC_Lvalue_Transformation, |
| 38 | ICC_Qualification_Adjustment, |
| 39 | ICC_Promotion, |
| 40 | ICC_Promotion, |
| 41 | ICC_Conversion, |
| 42 | ICC_Conversion, |
| 43 | ICC_Conversion, |
| 44 | ICC_Conversion, |
| 45 | ICC_Conversion, |
Douglas Gregor | 15da57e | 2008-10-29 02:00:59 +0000 | [diff] [blame] | 46 | ICC_Conversion, |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 47 | ICC_Conversion |
| 48 | }; |
| 49 | return Category[(int)Kind]; |
| 50 | } |
| 51 | |
| 52 | /// GetConversionRank - Retrieve the implicit conversion rank |
| 53 | /// corresponding to the given implicit conversion kind. |
| 54 | ImplicitConversionRank GetConversionRank(ImplicitConversionKind Kind) { |
| 55 | static const ImplicitConversionRank |
| 56 | Rank[(int)ICK_Num_Conversion_Kinds] = { |
| 57 | ICR_Exact_Match, |
| 58 | ICR_Exact_Match, |
| 59 | ICR_Exact_Match, |
| 60 | ICR_Exact_Match, |
| 61 | ICR_Exact_Match, |
| 62 | ICR_Promotion, |
| 63 | ICR_Promotion, |
| 64 | ICR_Conversion, |
| 65 | ICR_Conversion, |
| 66 | ICR_Conversion, |
| 67 | ICR_Conversion, |
| 68 | ICR_Conversion, |
Douglas Gregor | 15da57e | 2008-10-29 02:00:59 +0000 | [diff] [blame] | 69 | ICR_Conversion, |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 70 | ICR_Conversion |
| 71 | }; |
| 72 | return Rank[(int)Kind]; |
| 73 | } |
| 74 | |
| 75 | /// GetImplicitConversionName - Return the name of this kind of |
| 76 | /// implicit conversion. |
| 77 | const char* GetImplicitConversionName(ImplicitConversionKind Kind) { |
| 78 | static const char* Name[(int)ICK_Num_Conversion_Kinds] = { |
| 79 | "No conversion", |
| 80 | "Lvalue-to-rvalue", |
| 81 | "Array-to-pointer", |
| 82 | "Function-to-pointer", |
| 83 | "Qualification", |
| 84 | "Integral promotion", |
| 85 | "Floating point promotion", |
| 86 | "Integral conversion", |
| 87 | "Floating conversion", |
| 88 | "Floating-integral conversion", |
| 89 | "Pointer conversion", |
| 90 | "Pointer-to-member conversion", |
Douglas Gregor | 15da57e | 2008-10-29 02:00:59 +0000 | [diff] [blame] | 91 | "Boolean conversion", |
| 92 | "Derived-to-base conversion" |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 93 | }; |
| 94 | return Name[Kind]; |
| 95 | } |
| 96 | |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 97 | /// StandardConversionSequence - Set the standard conversion |
| 98 | /// sequence to the identity conversion. |
| 99 | void StandardConversionSequence::setAsIdentityConversion() { |
| 100 | First = ICK_Identity; |
| 101 | Second = ICK_Identity; |
| 102 | Third = ICK_Identity; |
| 103 | Deprecated = false; |
| 104 | ReferenceBinding = false; |
| 105 | DirectBinding = false; |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 106 | CopyConstructor = 0; |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 107 | } |
| 108 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 109 | /// getRank - Retrieve the rank of this standard conversion sequence |
| 110 | /// (C++ 13.3.3.1.1p3). The rank is the largest rank of each of the |
| 111 | /// implicit conversions. |
| 112 | ImplicitConversionRank StandardConversionSequence::getRank() const { |
| 113 | ImplicitConversionRank Rank = ICR_Exact_Match; |
| 114 | if (GetConversionRank(First) > Rank) |
| 115 | Rank = GetConversionRank(First); |
| 116 | if (GetConversionRank(Second) > Rank) |
| 117 | Rank = GetConversionRank(Second); |
| 118 | if (GetConversionRank(Third) > Rank) |
| 119 | Rank = GetConversionRank(Third); |
| 120 | return Rank; |
| 121 | } |
| 122 | |
| 123 | /// isPointerConversionToBool - Determines whether this conversion is |
| 124 | /// a conversion of a pointer or pointer-to-member to bool. This is |
| 125 | /// used as part of the ranking of standard conversion sequences |
| 126 | /// (C++ 13.3.3.2p4). |
| 127 | bool StandardConversionSequence::isPointerConversionToBool() const |
| 128 | { |
| 129 | QualType FromType = QualType::getFromOpaquePtr(FromTypePtr); |
| 130 | QualType ToType = QualType::getFromOpaquePtr(ToTypePtr); |
| 131 | |
| 132 | // Note that FromType has not necessarily been transformed by the |
| 133 | // array-to-pointer or function-to-pointer implicit conversions, so |
| 134 | // check for their presence as well as checking whether FromType is |
| 135 | // a pointer. |
| 136 | if (ToType->isBooleanType() && |
| 137 | (FromType->isPointerType() || |
| 138 | First == ICK_Array_To_Pointer || First == ICK_Function_To_Pointer)) |
| 139 | return true; |
| 140 | |
| 141 | return false; |
| 142 | } |
| 143 | |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 144 | /// isPointerConversionToVoidPointer - Determines whether this |
| 145 | /// conversion is a conversion of a pointer to a void pointer. This is |
| 146 | /// used as part of the ranking of standard conversion sequences (C++ |
| 147 | /// 13.3.3.2p4). |
| 148 | bool |
| 149 | StandardConversionSequence:: |
| 150 | isPointerConversionToVoidPointer(ASTContext& Context) const |
| 151 | { |
| 152 | QualType FromType = QualType::getFromOpaquePtr(FromTypePtr); |
| 153 | QualType ToType = QualType::getFromOpaquePtr(ToTypePtr); |
| 154 | |
| 155 | // Note that FromType has not necessarily been transformed by the |
| 156 | // array-to-pointer implicit conversion, so check for its presence |
| 157 | // and redo the conversion to get a pointer. |
| 158 | if (First == ICK_Array_To_Pointer) |
| 159 | FromType = Context.getArrayDecayedType(FromType); |
| 160 | |
| 161 | if (Second == ICK_Pointer_Conversion) |
| 162 | if (const PointerType* ToPtrType = ToType->getAsPointerType()) |
| 163 | return ToPtrType->getPointeeType()->isVoidType(); |
| 164 | |
| 165 | return false; |
| 166 | } |
| 167 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 168 | /// DebugPrint - Print this standard conversion sequence to standard |
| 169 | /// error. Useful for debugging overloading issues. |
| 170 | void StandardConversionSequence::DebugPrint() const { |
| 171 | bool PrintedSomething = false; |
| 172 | if (First != ICK_Identity) { |
| 173 | fprintf(stderr, "%s", GetImplicitConversionName(First)); |
| 174 | PrintedSomething = true; |
| 175 | } |
| 176 | |
| 177 | if (Second != ICK_Identity) { |
| 178 | if (PrintedSomething) { |
| 179 | fprintf(stderr, " -> "); |
| 180 | } |
| 181 | fprintf(stderr, "%s", GetImplicitConversionName(Second)); |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 182 | |
| 183 | if (CopyConstructor) { |
| 184 | fprintf(stderr, " (by copy constructor)"); |
| 185 | } else if (DirectBinding) { |
| 186 | fprintf(stderr, " (direct reference binding)"); |
| 187 | } else if (ReferenceBinding) { |
| 188 | fprintf(stderr, " (reference binding)"); |
| 189 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 190 | PrintedSomething = true; |
| 191 | } |
| 192 | |
| 193 | if (Third != ICK_Identity) { |
| 194 | if (PrintedSomething) { |
| 195 | fprintf(stderr, " -> "); |
| 196 | } |
| 197 | fprintf(stderr, "%s", GetImplicitConversionName(Third)); |
| 198 | PrintedSomething = true; |
| 199 | } |
| 200 | |
| 201 | if (!PrintedSomething) { |
| 202 | fprintf(stderr, "No conversions required"); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | /// DebugPrint - Print this user-defined conversion sequence to standard |
| 207 | /// error. Useful for debugging overloading issues. |
| 208 | void UserDefinedConversionSequence::DebugPrint() const { |
| 209 | if (Before.First || Before.Second || Before.Third) { |
| 210 | Before.DebugPrint(); |
| 211 | fprintf(stderr, " -> "); |
| 212 | } |
Chris Lattner | d9d22dd | 2008-11-24 05:29:24 +0000 | [diff] [blame] | 213 | fprintf(stderr, "'%s'", ConversionFunction->getNameAsString().c_str()); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 214 | if (After.First || After.Second || After.Third) { |
| 215 | fprintf(stderr, " -> "); |
| 216 | After.DebugPrint(); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | /// DebugPrint - Print this implicit conversion sequence to standard |
| 221 | /// error. Useful for debugging overloading issues. |
| 222 | void ImplicitConversionSequence::DebugPrint() const { |
| 223 | switch (ConversionKind) { |
| 224 | case StandardConversion: |
| 225 | fprintf(stderr, "Standard conversion: "); |
| 226 | Standard.DebugPrint(); |
| 227 | break; |
| 228 | case UserDefinedConversion: |
| 229 | fprintf(stderr, "User-defined conversion: "); |
| 230 | UserDefined.DebugPrint(); |
| 231 | break; |
| 232 | case EllipsisConversion: |
| 233 | fprintf(stderr, "Ellipsis conversion"); |
| 234 | break; |
| 235 | case BadConversion: |
| 236 | fprintf(stderr, "Bad conversion"); |
| 237 | break; |
| 238 | } |
| 239 | |
| 240 | fprintf(stderr, "\n"); |
| 241 | } |
| 242 | |
| 243 | // IsOverload - Determine whether the given New declaration is an |
| 244 | // overload of the Old declaration. This routine returns false if New |
| 245 | // and Old cannot be overloaded, e.g., if they are functions with the |
| 246 | // same signature (C++ 1.3.10) or if the Old declaration isn't a |
| 247 | // function (or overload set). When it does return false and Old is an |
| 248 | // OverloadedFunctionDecl, MatchedDecl will be set to point to the |
| 249 | // FunctionDecl that New cannot be overloaded with. |
| 250 | // |
| 251 | // Example: Given the following input: |
| 252 | // |
| 253 | // void f(int, float); // #1 |
| 254 | // void f(int, int); // #2 |
| 255 | // int f(int, int); // #3 |
| 256 | // |
| 257 | // When we process #1, there is no previous declaration of "f", |
| 258 | // so IsOverload will not be used. |
| 259 | // |
| 260 | // When we process #2, Old is a FunctionDecl for #1. By comparing the |
| 261 | // parameter types, we see that #1 and #2 are overloaded (since they |
| 262 | // have different signatures), so this routine returns false; |
| 263 | // MatchedDecl is unchanged. |
| 264 | // |
| 265 | // When we process #3, Old is an OverloadedFunctionDecl containing #1 |
| 266 | // and #2. We compare the signatures of #3 to #1 (they're overloaded, |
| 267 | // so we do nothing) and then #3 to #2. Since the signatures of #3 and |
| 268 | // #2 are identical (return types of functions are not part of the |
| 269 | // signature), IsOverload returns false and MatchedDecl will be set to |
| 270 | // point to the FunctionDecl for #2. |
| 271 | bool |
| 272 | Sema::IsOverload(FunctionDecl *New, Decl* OldD, |
| 273 | OverloadedFunctionDecl::function_iterator& MatchedDecl) |
| 274 | { |
| 275 | if (OverloadedFunctionDecl* Ovl = dyn_cast<OverloadedFunctionDecl>(OldD)) { |
| 276 | // Is this new function an overload of every function in the |
| 277 | // overload set? |
| 278 | OverloadedFunctionDecl::function_iterator Func = Ovl->function_begin(), |
| 279 | FuncEnd = Ovl->function_end(); |
| 280 | for (; Func != FuncEnd; ++Func) { |
| 281 | if (!IsOverload(New, *Func, MatchedDecl)) { |
| 282 | MatchedDecl = Func; |
| 283 | return false; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | // This function overloads every function in the overload set. |
| 288 | return true; |
| 289 | } else if (FunctionDecl* Old = dyn_cast<FunctionDecl>(OldD)) { |
| 290 | // Is the function New an overload of the function Old? |
| 291 | QualType OldQType = Context.getCanonicalType(Old->getType()); |
| 292 | QualType NewQType = Context.getCanonicalType(New->getType()); |
| 293 | |
| 294 | // Compare the signatures (C++ 1.3.10) of the two functions to |
| 295 | // determine whether they are overloads. If we find any mismatch |
| 296 | // in the signature, they are overloads. |
| 297 | |
| 298 | // If either of these functions is a K&R-style function (no |
| 299 | // prototype), then we consider them to have matching signatures. |
| 300 | if (isa<FunctionTypeNoProto>(OldQType.getTypePtr()) || |
| 301 | isa<FunctionTypeNoProto>(NewQType.getTypePtr())) |
| 302 | return false; |
| 303 | |
| 304 | FunctionTypeProto* OldType = cast<FunctionTypeProto>(OldQType.getTypePtr()); |
| 305 | FunctionTypeProto* NewType = cast<FunctionTypeProto>(NewQType.getTypePtr()); |
| 306 | |
| 307 | // The signature of a function includes the types of its |
| 308 | // parameters (C++ 1.3.10), which includes the presence or absence |
| 309 | // of the ellipsis; see C++ DR 357). |
| 310 | if (OldQType != NewQType && |
| 311 | (OldType->getNumArgs() != NewType->getNumArgs() || |
| 312 | OldType->isVariadic() != NewType->isVariadic() || |
| 313 | !std::equal(OldType->arg_type_begin(), OldType->arg_type_end(), |
| 314 | NewType->arg_type_begin()))) |
| 315 | return true; |
| 316 | |
| 317 | // If the function is a class member, its signature includes the |
| 318 | // cv-qualifiers (if any) on the function itself. |
| 319 | // |
| 320 | // As part of this, also check whether one of the member functions |
| 321 | // is static, in which case they are not overloads (C++ |
| 322 | // 13.1p2). While not part of the definition of the signature, |
| 323 | // this check is important to determine whether these functions |
| 324 | // can be overloaded. |
| 325 | CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); |
| 326 | CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); |
| 327 | if (OldMethod && NewMethod && |
| 328 | !OldMethod->isStatic() && !NewMethod->isStatic() && |
Douglas Gregor | 1ca50c3 | 2008-11-21 15:36:28 +0000 | [diff] [blame] | 329 | OldMethod->getTypeQualifiers() != NewMethod->getTypeQualifiers()) |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 330 | return true; |
| 331 | |
| 332 | // The signatures match; this is not an overload. |
| 333 | return false; |
| 334 | } else { |
| 335 | // (C++ 13p1): |
| 336 | // Only function declarations can be overloaded; object and type |
| 337 | // declarations cannot be overloaded. |
| 338 | return false; |
| 339 | } |
| 340 | } |
| 341 | |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 342 | /// TryImplicitConversion - Attempt to perform an implicit conversion |
| 343 | /// from the given expression (Expr) to the given type (ToType). This |
| 344 | /// function returns an implicit conversion sequence that can be used |
| 345 | /// to perform the initialization. Given |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 346 | /// |
| 347 | /// void f(float f); |
| 348 | /// void g(int i) { f(i); } |
| 349 | /// |
| 350 | /// this routine would produce an implicit conversion sequence to |
| 351 | /// describe the initialization of f from i, which will be a standard |
| 352 | /// conversion sequence containing an lvalue-to-rvalue conversion (C++ |
| 353 | /// 4.1) followed by a floating-integral conversion (C++ 4.9). |
| 354 | // |
| 355 | /// Note that this routine only determines how the conversion can be |
| 356 | /// performed; it does not actually perform the conversion. As such, |
| 357 | /// it will not produce any diagnostics if no conversion is available, |
| 358 | /// but will instead return an implicit conversion sequence of kind |
| 359 | /// "BadConversion". |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 360 | /// |
| 361 | /// If @p SuppressUserConversions, then user-defined conversions are |
| 362 | /// not permitted. |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 363 | ImplicitConversionSequence |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 364 | Sema::TryImplicitConversion(Expr* From, QualType ToType, |
| 365 | bool SuppressUserConversions) |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 366 | { |
| 367 | ImplicitConversionSequence ICS; |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 368 | if (IsStandardConversion(From, ToType, ICS.Standard)) |
| 369 | ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 370 | else if (!SuppressUserConversions && |
| 371 | IsUserDefinedConversion(From, ToType, ICS.UserDefined)) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 372 | ICS.ConversionKind = ImplicitConversionSequence::UserDefinedConversion; |
Douglas Gregor | 396b7cd | 2008-11-03 17:51:48 +0000 | [diff] [blame] | 373 | // C++ [over.ics.user]p4: |
| 374 | // A conversion of an expression of class type to the same class |
| 375 | // type is given Exact Match rank, and a conversion of an |
| 376 | // expression of class type to a base class of that type is |
| 377 | // given Conversion rank, in spite of the fact that a copy |
| 378 | // constructor (i.e., a user-defined conversion function) is |
| 379 | // called for those cases. |
| 380 | if (CXXConstructorDecl *Constructor |
| 381 | = dyn_cast<CXXConstructorDecl>(ICS.UserDefined.ConversionFunction)) { |
| 382 | if (Constructor->isCopyConstructor(Context)) { |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 383 | // Turn this into a "standard" conversion sequence, so that it |
| 384 | // gets ranked with standard conversion sequences. |
Douglas Gregor | 396b7cd | 2008-11-03 17:51:48 +0000 | [diff] [blame] | 385 | ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; |
| 386 | ICS.Standard.setAsIdentityConversion(); |
| 387 | ICS.Standard.FromTypePtr = From->getType().getAsOpaquePtr(); |
| 388 | ICS.Standard.ToTypePtr = ToType.getAsOpaquePtr(); |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 389 | ICS.Standard.CopyConstructor = Constructor; |
Douglas Gregor | 396b7cd | 2008-11-03 17:51:48 +0000 | [diff] [blame] | 390 | if (IsDerivedFrom(From->getType().getUnqualifiedType(), |
| 391 | ToType.getUnqualifiedType())) |
| 392 | ICS.Standard.Second = ICK_Derived_To_Base; |
| 393 | } |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 394 | } |
Douglas Gregor | 396b7cd | 2008-11-03 17:51:48 +0000 | [diff] [blame] | 395 | } else |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 396 | ICS.ConversionKind = ImplicitConversionSequence::BadConversion; |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 397 | |
| 398 | return ICS; |
| 399 | } |
| 400 | |
| 401 | /// IsStandardConversion - Determines whether there is a standard |
| 402 | /// conversion sequence (C++ [conv], C++ [over.ics.scs]) from the |
| 403 | /// expression From to the type ToType. Standard conversion sequences |
| 404 | /// only consider non-class types; for conversions that involve class |
| 405 | /// types, use TryImplicitConversion. If a conversion exists, SCS will |
| 406 | /// contain the standard conversion sequence required to perform this |
| 407 | /// conversion and this routine will return true. Otherwise, this |
| 408 | /// routine will return false and the value of SCS is unspecified. |
| 409 | bool |
| 410 | Sema::IsStandardConversion(Expr* From, QualType ToType, |
| 411 | StandardConversionSequence &SCS) |
| 412 | { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 413 | QualType FromType = From->getType(); |
| 414 | |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 415 | // There are no standard conversions for class types, so abort early. |
| 416 | if (FromType->isRecordType() || ToType->isRecordType()) |
| 417 | return false; |
| 418 | |
| 419 | // Standard conversions (C++ [conv]) |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 420 | SCS.setAsIdentityConversion(); |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 421 | SCS.Deprecated = false; |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 422 | SCS.IncompatibleObjC = false; |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 423 | SCS.FromTypePtr = FromType.getAsOpaquePtr(); |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 424 | SCS.CopyConstructor = 0; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 425 | |
| 426 | // The first conversion can be an lvalue-to-rvalue conversion, |
| 427 | // array-to-pointer conversion, or function-to-pointer conversion |
| 428 | // (C++ 4p1). |
| 429 | |
| 430 | // Lvalue-to-rvalue conversion (C++ 4.1): |
| 431 | // An lvalue (3.10) of a non-function, non-array type T can be |
| 432 | // converted to an rvalue. |
| 433 | Expr::isLvalueResult argIsLvalue = From->isLvalue(Context); |
| 434 | if (argIsLvalue == Expr::LV_Valid && |
Douglas Gregor | 904eed3 | 2008-11-10 20:40:00 +0000 | [diff] [blame] | 435 | !FromType->isFunctionType() && !FromType->isArrayType() && |
| 436 | !FromType->isOverloadType()) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 437 | SCS.First = ICK_Lvalue_To_Rvalue; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 438 | |
| 439 | // If T is a non-class type, the type of the rvalue is the |
| 440 | // cv-unqualified version of T. Otherwise, the type of the rvalue |
| 441 | // is T (C++ 4.1p1). |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 442 | FromType = FromType.getUnqualifiedType(); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 443 | } |
| 444 | // Array-to-pointer conversion (C++ 4.2) |
| 445 | else if (FromType->isArrayType()) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 446 | SCS.First = ICK_Array_To_Pointer; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 447 | |
| 448 | // An lvalue or rvalue of type "array of N T" or "array of unknown |
| 449 | // bound of T" can be converted to an rvalue of type "pointer to |
| 450 | // T" (C++ 4.2p1). |
| 451 | FromType = Context.getArrayDecayedType(FromType); |
| 452 | |
| 453 | if (IsStringLiteralToNonConstPointerConversion(From, ToType)) { |
| 454 | // This conversion is deprecated. (C++ D.4). |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 455 | SCS.Deprecated = true; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 456 | |
| 457 | // For the purpose of ranking in overload resolution |
| 458 | // (13.3.3.1.1), this conversion is considered an |
| 459 | // array-to-pointer conversion followed by a qualification |
| 460 | // conversion (4.4). (C++ 4.2p2) |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 461 | SCS.Second = ICK_Identity; |
| 462 | SCS.Third = ICK_Qualification; |
| 463 | SCS.ToTypePtr = ToType.getAsOpaquePtr(); |
| 464 | return true; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 465 | } |
| 466 | } |
| 467 | // Function-to-pointer conversion (C++ 4.3). |
| 468 | else if (FromType->isFunctionType() && argIsLvalue == Expr::LV_Valid) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 469 | SCS.First = ICK_Function_To_Pointer; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 470 | |
| 471 | // An lvalue of function type T can be converted to an rvalue of |
| 472 | // type "pointer to T." The result is a pointer to the |
| 473 | // function. (C++ 4.3p1). |
| 474 | FromType = Context.getPointerType(FromType); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 475 | } |
Douglas Gregor | 904eed3 | 2008-11-10 20:40:00 +0000 | [diff] [blame] | 476 | // Address of overloaded function (C++ [over.over]). |
| 477 | else if (FunctionDecl *Fn |
| 478 | = ResolveAddressOfOverloadedFunction(From, ToType, false)) { |
| 479 | SCS.First = ICK_Function_To_Pointer; |
| 480 | |
| 481 | // We were able to resolve the address of the overloaded function, |
| 482 | // so we can convert to the type of that function. |
| 483 | FromType = Fn->getType(); |
| 484 | if (ToType->isReferenceType()) |
| 485 | FromType = Context.getReferenceType(FromType); |
| 486 | else |
| 487 | FromType = Context.getPointerType(FromType); |
| 488 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 489 | // We don't require any conversions for the first step. |
| 490 | else { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 491 | SCS.First = ICK_Identity; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | // The second conversion can be an integral promotion, floating |
| 495 | // point promotion, integral conversion, floating point conversion, |
| 496 | // floating-integral conversion, pointer conversion, |
| 497 | // pointer-to-member conversion, or boolean conversion (C++ 4p1). |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 498 | bool IncompatibleObjC = false; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 499 | if (Context.getCanonicalType(FromType).getUnqualifiedType() == |
| 500 | Context.getCanonicalType(ToType).getUnqualifiedType()) { |
| 501 | // The unqualified versions of the types are the same: there's no |
| 502 | // conversion to do. |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 503 | SCS.Second = ICK_Identity; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 504 | } |
| 505 | // Integral promotion (C++ 4.5). |
| 506 | else if (IsIntegralPromotion(From, FromType, ToType)) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 507 | SCS.Second = ICK_Integral_Promotion; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 508 | FromType = ToType.getUnqualifiedType(); |
| 509 | } |
| 510 | // Floating point promotion (C++ 4.6). |
| 511 | else if (IsFloatingPointPromotion(FromType, ToType)) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 512 | SCS.Second = ICK_Floating_Promotion; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 513 | FromType = ToType.getUnqualifiedType(); |
| 514 | } |
| 515 | // Integral conversions (C++ 4.7). |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 516 | // FIXME: isIntegralType shouldn't be true for enums in C++. |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 517 | else if ((FromType->isIntegralType() || FromType->isEnumeralType()) && |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 518 | (ToType->isIntegralType() && !ToType->isEnumeralType())) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 519 | SCS.Second = ICK_Integral_Conversion; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 520 | FromType = ToType.getUnqualifiedType(); |
| 521 | } |
| 522 | // Floating point conversions (C++ 4.8). |
| 523 | else if (FromType->isFloatingType() && ToType->isFloatingType()) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 524 | SCS.Second = ICK_Floating_Conversion; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 525 | FromType = ToType.getUnqualifiedType(); |
| 526 | } |
| 527 | // Floating-integral conversions (C++ 4.9). |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 528 | // FIXME: isIntegralType shouldn't be true for enums in C++. |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 529 | else if ((FromType->isFloatingType() && |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 530 | ToType->isIntegralType() && !ToType->isBooleanType() && |
| 531 | !ToType->isEnumeralType()) || |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 532 | ((FromType->isIntegralType() || FromType->isEnumeralType()) && |
| 533 | ToType->isFloatingType())) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 534 | SCS.Second = ICK_Floating_Integral; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 535 | FromType = ToType.getUnqualifiedType(); |
| 536 | } |
| 537 | // Pointer conversions (C++ 4.10). |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 538 | else if (IsPointerConversion(From, FromType, ToType, FromType, |
| 539 | IncompatibleObjC)) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 540 | SCS.Second = ICK_Pointer_Conversion; |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 541 | SCS.IncompatibleObjC = IncompatibleObjC; |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 542 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 543 | // FIXME: Pointer to member conversions (4.11). |
| 544 | // Boolean conversions (C++ 4.12). |
| 545 | // FIXME: pointer-to-member type |
| 546 | else if (ToType->isBooleanType() && |
| 547 | (FromType->isArithmeticType() || |
| 548 | FromType->isEnumeralType() || |
| 549 | FromType->isPointerType())) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 550 | SCS.Second = ICK_Boolean_Conversion; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 551 | FromType = Context.BoolTy; |
| 552 | } else { |
| 553 | // No second conversion required. |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 554 | SCS.Second = ICK_Identity; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 555 | } |
| 556 | |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 557 | QualType CanonFrom; |
| 558 | QualType CanonTo; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 559 | // The third conversion can be a qualification conversion (C++ 4p1). |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 560 | if (IsQualificationConversion(FromType, ToType)) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 561 | SCS.Third = ICK_Qualification; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 562 | FromType = ToType; |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 563 | CanonFrom = Context.getCanonicalType(FromType); |
| 564 | CanonTo = Context.getCanonicalType(ToType); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 565 | } else { |
| 566 | // No conversion required |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 567 | SCS.Third = ICK_Identity; |
| 568 | |
| 569 | // C++ [over.best.ics]p6: |
| 570 | // [...] Any difference in top-level cv-qualification is |
| 571 | // subsumed by the initialization itself and does not constitute |
| 572 | // a conversion. [...] |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 573 | CanonFrom = Context.getCanonicalType(FromType); |
| 574 | CanonTo = Context.getCanonicalType(ToType); |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 575 | if (CanonFrom.getUnqualifiedType() == CanonTo.getUnqualifiedType() && |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 576 | CanonFrom.getCVRQualifiers() != CanonTo.getCVRQualifiers()) { |
| 577 | FromType = ToType; |
| 578 | CanonFrom = CanonTo; |
| 579 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | // If we have not converted the argument type to the parameter type, |
| 583 | // this is a bad conversion sequence. |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 584 | if (CanonFrom != CanonTo) |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 585 | return false; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 586 | |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 587 | SCS.ToTypePtr = FromType.getAsOpaquePtr(); |
| 588 | return true; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | /// IsIntegralPromotion - Determines whether the conversion from the |
| 592 | /// expression From (whose potentially-adjusted type is FromType) to |
| 593 | /// ToType is an integral promotion (C++ 4.5). If so, returns true and |
| 594 | /// sets PromotedType to the promoted type. |
| 595 | bool Sema::IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType) |
| 596 | { |
| 597 | const BuiltinType *To = ToType->getAsBuiltinType(); |
Sebastian Redl | f7be944 | 2008-11-04 15:59:10 +0000 | [diff] [blame] | 598 | // All integers are built-in. |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 599 | if (!To) { |
| 600 | return false; |
| 601 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 602 | |
| 603 | // An rvalue of type char, signed char, unsigned char, short int, or |
| 604 | // unsigned short int can be converted to an rvalue of type int if |
| 605 | // int can represent all the values of the source type; otherwise, |
| 606 | // the source rvalue can be converted to an rvalue of type unsigned |
| 607 | // int (C++ 4.5p1). |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 608 | if (FromType->isPromotableIntegerType() && !FromType->isBooleanType()) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 609 | if (// We can promote any signed, promotable integer type to an int |
| 610 | (FromType->isSignedIntegerType() || |
| 611 | // We can promote any unsigned integer type whose size is |
| 612 | // less than int to an int. |
| 613 | (!FromType->isSignedIntegerType() && |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 614 | Context.getTypeSize(FromType) < Context.getTypeSize(ToType)))) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 615 | return To->getKind() == BuiltinType::Int; |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 616 | } |
| 617 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 618 | return To->getKind() == BuiltinType::UInt; |
| 619 | } |
| 620 | |
| 621 | // An rvalue of type wchar_t (3.9.1) or an enumeration type (7.2) |
| 622 | // can be converted to an rvalue of the first of the following types |
| 623 | // that can represent all the values of its underlying type: int, |
| 624 | // unsigned int, long, or unsigned long (C++ 4.5p2). |
| 625 | if ((FromType->isEnumeralType() || FromType->isWideCharType()) |
| 626 | && ToType->isIntegerType()) { |
| 627 | // Determine whether the type we're converting from is signed or |
| 628 | // unsigned. |
| 629 | bool FromIsSigned; |
| 630 | uint64_t FromSize = Context.getTypeSize(FromType); |
| 631 | if (const EnumType *FromEnumType = FromType->getAsEnumType()) { |
| 632 | QualType UnderlyingType = FromEnumType->getDecl()->getIntegerType(); |
| 633 | FromIsSigned = UnderlyingType->isSignedIntegerType(); |
| 634 | } else { |
| 635 | // FIXME: Is wchar_t signed or unsigned? We assume it's signed for now. |
| 636 | FromIsSigned = true; |
| 637 | } |
| 638 | |
| 639 | // The types we'll try to promote to, in the appropriate |
| 640 | // order. Try each of these types. |
Douglas Gregor | c9467cf | 2008-12-12 02:00:36 +0000 | [diff] [blame] | 641 | QualType PromoteTypes[6] = { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 642 | Context.IntTy, Context.UnsignedIntTy, |
Douglas Gregor | c9467cf | 2008-12-12 02:00:36 +0000 | [diff] [blame] | 643 | Context.LongTy, Context.UnsignedLongTy , |
| 644 | Context.LongLongTy, Context.UnsignedLongLongTy |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 645 | }; |
Douglas Gregor | c9467cf | 2008-12-12 02:00:36 +0000 | [diff] [blame] | 646 | for (int Idx = 0; Idx < 6; ++Idx) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 647 | uint64_t ToSize = Context.getTypeSize(PromoteTypes[Idx]); |
| 648 | if (FromSize < ToSize || |
| 649 | (FromSize == ToSize && |
| 650 | FromIsSigned == PromoteTypes[Idx]->isSignedIntegerType())) { |
| 651 | // We found the type that we can promote to. If this is the |
| 652 | // type we wanted, we have a promotion. Otherwise, no |
| 653 | // promotion. |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 654 | return Context.getCanonicalType(ToType).getUnqualifiedType() |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 655 | == Context.getCanonicalType(PromoteTypes[Idx]).getUnqualifiedType(); |
| 656 | } |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | // An rvalue for an integral bit-field (9.6) can be converted to an |
| 661 | // rvalue of type int if int can represent all the values of the |
| 662 | // bit-field; otherwise, it can be converted to unsigned int if |
| 663 | // unsigned int can represent all the values of the bit-field. If |
| 664 | // the bit-field is larger yet, no integral promotion applies to |
| 665 | // it. If the bit-field has an enumerated type, it is treated as any |
| 666 | // other value of that type for promotion purposes (C++ 4.5p3). |
| 667 | if (MemberExpr *MemRef = dyn_cast<MemberExpr>(From)) { |
| 668 | using llvm::APSInt; |
| 669 | FieldDecl *MemberDecl = MemRef->getMemberDecl(); |
| 670 | APSInt BitWidth; |
| 671 | if (MemberDecl->isBitField() && |
| 672 | FromType->isIntegralType() && !FromType->isEnumeralType() && |
| 673 | From->isIntegerConstantExpr(BitWidth, Context)) { |
| 674 | APSInt ToSize(Context.getTypeSize(ToType)); |
| 675 | |
| 676 | // Are we promoting to an int from a bitfield that fits in an int? |
| 677 | if (BitWidth < ToSize || |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 678 | (FromType->isSignedIntegerType() && BitWidth <= ToSize)) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 679 | return To->getKind() == BuiltinType::Int; |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 680 | } |
| 681 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 682 | // Are we promoting to an unsigned int from an unsigned bitfield |
| 683 | // that fits into an unsigned int? |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 684 | if (FromType->isUnsignedIntegerType() && BitWidth <= ToSize) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 685 | return To->getKind() == BuiltinType::UInt; |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 686 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 687 | |
| 688 | return false; |
| 689 | } |
| 690 | } |
| 691 | |
| 692 | // An rvalue of type bool can be converted to an rvalue of type int, |
| 693 | // with false becoming zero and true becoming one (C++ 4.5p4). |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 694 | if (FromType->isBooleanType() && To->getKind() == BuiltinType::Int) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 695 | return true; |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 696 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 697 | |
| 698 | return false; |
| 699 | } |
| 700 | |
| 701 | /// IsFloatingPointPromotion - Determines whether the conversion from |
| 702 | /// FromType to ToType is a floating point promotion (C++ 4.6). If so, |
| 703 | /// returns true and sets PromotedType to the promoted type. |
| 704 | bool Sema::IsFloatingPointPromotion(QualType FromType, QualType ToType) |
| 705 | { |
| 706 | /// An rvalue of type float can be converted to an rvalue of type |
| 707 | /// double. (C++ 4.6p1). |
| 708 | if (const BuiltinType *FromBuiltin = FromType->getAsBuiltinType()) |
| 709 | if (const BuiltinType *ToBuiltin = ToType->getAsBuiltinType()) |
| 710 | if (FromBuiltin->getKind() == BuiltinType::Float && |
| 711 | ToBuiltin->getKind() == BuiltinType::Double) |
| 712 | return true; |
| 713 | |
| 714 | return false; |
| 715 | } |
| 716 | |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 717 | /// BuildSimilarlyQualifiedPointerType - In a pointer conversion from |
| 718 | /// the pointer type FromPtr to a pointer to type ToPointee, with the |
| 719 | /// same type qualifiers as FromPtr has on its pointee type. ToType, |
| 720 | /// if non-empty, will be a pointer to ToType that may or may not have |
| 721 | /// the right set of qualifiers on its pointee. |
| 722 | static QualType |
| 723 | BuildSimilarlyQualifiedPointerType(const PointerType *FromPtr, |
| 724 | QualType ToPointee, QualType ToType, |
| 725 | ASTContext &Context) { |
| 726 | QualType CanonFromPointee = Context.getCanonicalType(FromPtr->getPointeeType()); |
| 727 | QualType CanonToPointee = Context.getCanonicalType(ToPointee); |
| 728 | unsigned Quals = CanonFromPointee.getCVRQualifiers(); |
| 729 | |
| 730 | // Exact qualifier match -> return the pointer type we're converting to. |
| 731 | if (CanonToPointee.getCVRQualifiers() == Quals) { |
| 732 | // ToType is exactly what we need. Return it. |
| 733 | if (ToType.getTypePtr()) |
| 734 | return ToType; |
| 735 | |
| 736 | // Build a pointer to ToPointee. It has the right qualifiers |
| 737 | // already. |
| 738 | return Context.getPointerType(ToPointee); |
| 739 | } |
| 740 | |
| 741 | // Just build a canonical type that has the right qualifiers. |
| 742 | return Context.getPointerType(CanonToPointee.getQualifiedType(Quals)); |
| 743 | } |
| 744 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 745 | /// IsPointerConversion - Determines whether the conversion of the |
| 746 | /// expression From, which has the (possibly adjusted) type FromType, |
| 747 | /// can be converted to the type ToType via a pointer conversion (C++ |
| 748 | /// 4.10). If so, returns true and places the converted type (that |
| 749 | /// might differ from ToType in its cv-qualifiers at some level) into |
| 750 | /// ConvertedType. |
Douglas Gregor | 071f2ae | 2008-11-27 00:15:41 +0000 | [diff] [blame] | 751 | /// |
Douglas Gregor | 7ca0976 | 2008-11-27 01:19:21 +0000 | [diff] [blame] | 752 | /// This routine also supports conversions to and from block pointers |
| 753 | /// and conversions with Objective-C's 'id', 'id<protocols...>', and |
| 754 | /// pointers to interfaces. FIXME: Once we've determined the |
| 755 | /// appropriate overloading rules for Objective-C, we may want to |
| 756 | /// split the Objective-C checks into a different routine; however, |
| 757 | /// GCC seems to consider all of these conversions to be pointer |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 758 | /// conversions, so for now they live here. IncompatibleObjC will be |
| 759 | /// set if the conversion is an allowed Objective-C conversion that |
| 760 | /// should result in a warning. |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 761 | bool Sema::IsPointerConversion(Expr *From, QualType FromType, QualType ToType, |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 762 | QualType& ConvertedType, |
| 763 | bool &IncompatibleObjC) |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 764 | { |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 765 | IncompatibleObjC = false; |
| 766 | |
Douglas Gregor | 071f2ae | 2008-11-27 00:15:41 +0000 | [diff] [blame] | 767 | // Blocks: Block pointers can be converted to void*. |
| 768 | if (FromType->isBlockPointerType() && ToType->isPointerType() && |
| 769 | ToType->getAsPointerType()->getPointeeType()->isVoidType()) { |
| 770 | ConvertedType = ToType; |
| 771 | return true; |
| 772 | } |
| 773 | // Blocks: A null pointer constant can be converted to a block |
| 774 | // pointer type. |
| 775 | if (ToType->isBlockPointerType() && From->isNullPointerConstant(Context)) { |
| 776 | ConvertedType = ToType; |
| 777 | return true; |
| 778 | } |
| 779 | |
Douglas Gregor | 7ca0976 | 2008-11-27 01:19:21 +0000 | [diff] [blame] | 780 | // Conversions with Objective-C's id<...>. |
| 781 | if ((FromType->isObjCQualifiedIdType() || ToType->isObjCQualifiedIdType()) && |
| 782 | ObjCQualifiedIdTypesAreCompatible(ToType, FromType, /*compare=*/false)) { |
| 783 | ConvertedType = ToType; |
| 784 | return true; |
| 785 | } |
| 786 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 787 | const PointerType* ToTypePtr = ToType->getAsPointerType(); |
| 788 | if (!ToTypePtr) |
| 789 | return false; |
| 790 | |
| 791 | // A null pointer constant can be converted to a pointer type (C++ 4.10p1). |
| 792 | if (From->isNullPointerConstant(Context)) { |
| 793 | ConvertedType = ToType; |
| 794 | return true; |
| 795 | } |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 796 | |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 797 | // Beyond this point, both types need to be pointers. |
| 798 | const PointerType *FromTypePtr = FromType->getAsPointerType(); |
| 799 | if (!FromTypePtr) |
| 800 | return false; |
| 801 | |
| 802 | QualType FromPointeeType = FromTypePtr->getPointeeType(); |
| 803 | QualType ToPointeeType = ToTypePtr->getPointeeType(); |
| 804 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 805 | // An rvalue of type "pointer to cv T," where T is an object type, |
| 806 | // can be converted to an rvalue of type "pointer to cv void" (C++ |
| 807 | // 4.10p2). |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 808 | if (FromPointeeType->isIncompleteOrObjectType() && ToPointeeType->isVoidType()) { |
Douglas Gregor | bf40818 | 2008-11-27 00:52:49 +0000 | [diff] [blame] | 809 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, |
| 810 | ToPointeeType, |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 811 | ToType, Context); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 812 | return true; |
| 813 | } |
| 814 | |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 815 | // C++ [conv.ptr]p3: |
| 816 | // |
| 817 | // An rvalue of type "pointer to cv D," where D is a class type, |
| 818 | // can be converted to an rvalue of type "pointer to cv B," where |
| 819 | // B is a base class (clause 10) of D. If B is an inaccessible |
| 820 | // (clause 11) or ambiguous (10.2) base class of D, a program that |
| 821 | // necessitates this conversion is ill-formed. The result of the |
| 822 | // conversion is a pointer to the base class sub-object of the |
| 823 | // derived class object. The null pointer value is converted to |
| 824 | // the null pointer value of the destination type. |
| 825 | // |
Douglas Gregor | 94b1dd2 | 2008-10-24 04:54:22 +0000 | [diff] [blame] | 826 | // Note that we do not check for ambiguity or inaccessibility |
| 827 | // here. That is handled by CheckPointerConversion. |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 828 | if (FromPointeeType->isRecordType() && ToPointeeType->isRecordType() && |
| 829 | IsDerivedFrom(FromPointeeType, ToPointeeType)) { |
Douglas Gregor | bf40818 | 2008-11-27 00:52:49 +0000 | [diff] [blame] | 830 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, |
| 831 | ToPointeeType, |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 832 | ToType, Context); |
| 833 | return true; |
| 834 | } |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 835 | |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 836 | // Objective C++: We're able to convert from a pointer to an |
| 837 | // interface to a pointer to a different interface. |
| 838 | const ObjCInterfaceType* FromIface = FromPointeeType->getAsObjCInterfaceType(); |
| 839 | const ObjCInterfaceType* ToIface = ToPointeeType->getAsObjCInterfaceType(); |
| 840 | if (FromIface && ToIface && |
| 841 | Context.canAssignObjCInterfaces(ToIface, FromIface)) { |
Douglas Gregor | bf40818 | 2008-11-27 00:52:49 +0000 | [diff] [blame] | 842 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, |
| 843 | ToPointeeType, |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 844 | ToType, Context); |
| 845 | return true; |
| 846 | } |
| 847 | |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 848 | if (FromIface && ToIface && |
| 849 | Context.canAssignObjCInterfaces(FromIface, ToIface)) { |
| 850 | // Okay: this is some kind of implicit downcast of Objective-C |
| 851 | // interfaces, which is permitted. However, we're going to |
| 852 | // complain about it. |
| 853 | IncompatibleObjC = true; |
| 854 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, |
| 855 | ToPointeeType, |
| 856 | ToType, Context); |
| 857 | return true; |
| 858 | } |
| 859 | |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 860 | // Objective C++: We're able to convert between "id" and a pointer |
| 861 | // to any interface (in both directions). |
| 862 | if ((FromIface && Context.isObjCIdType(ToPointeeType)) |
| 863 | || (ToIface && Context.isObjCIdType(FromPointeeType))) { |
Douglas Gregor | bf40818 | 2008-11-27 00:52:49 +0000 | [diff] [blame] | 864 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, |
| 865 | ToPointeeType, |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 866 | ToType, Context); |
| 867 | return true; |
| 868 | } |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 869 | |
Douglas Gregor | dda7889 | 2008-12-18 23:43:31 +0000 | [diff] [blame] | 870 | // Objective C++: Allow conversions between the Objective-C "id" and |
| 871 | // "Class", in either direction. |
| 872 | if ((Context.isObjCIdType(FromPointeeType) && |
| 873 | Context.isObjCClassType(ToPointeeType)) || |
| 874 | (Context.isObjCClassType(FromPointeeType) && |
| 875 | Context.isObjCIdType(ToPointeeType))) { |
| 876 | ConvertedType = ToType; |
| 877 | return true; |
| 878 | } |
| 879 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 880 | return false; |
| 881 | } |
| 882 | |
Douglas Gregor | 94b1dd2 | 2008-10-24 04:54:22 +0000 | [diff] [blame] | 883 | /// CheckPointerConversion - Check the pointer conversion from the |
| 884 | /// expression From to the type ToType. This routine checks for |
| 885 | /// ambiguous (FIXME: or inaccessible) derived-to-base pointer |
| 886 | /// conversions for which IsPointerConversion has already returned |
| 887 | /// true. It returns true and produces a diagnostic if there was an |
| 888 | /// error, or returns false otherwise. |
| 889 | bool Sema::CheckPointerConversion(Expr *From, QualType ToType) { |
| 890 | QualType FromType = From->getType(); |
| 891 | |
| 892 | if (const PointerType *FromPtrType = FromType->getAsPointerType()) |
| 893 | if (const PointerType *ToPtrType = ToType->getAsPointerType()) { |
Sebastian Redl | 0777972 | 2008-10-31 14:43:28 +0000 | [diff] [blame] | 894 | BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false, |
| 895 | /*DetectVirtual=*/false); |
Douglas Gregor | 94b1dd2 | 2008-10-24 04:54:22 +0000 | [diff] [blame] | 896 | QualType FromPointeeType = FromPtrType->getPointeeType(), |
| 897 | ToPointeeType = ToPtrType->getPointeeType(); |
Douglas Gregor | dda7889 | 2008-12-18 23:43:31 +0000 | [diff] [blame] | 898 | |
| 899 | // Objective-C++ conversions are always okay. |
| 900 | // FIXME: We should have a different class of conversions for |
| 901 | // the Objective-C++ implicit conversions. |
| 902 | if (Context.isObjCIdType(FromPointeeType) || |
| 903 | Context.isObjCIdType(ToPointeeType) || |
| 904 | Context.isObjCClassType(FromPointeeType) || |
| 905 | Context.isObjCClassType(ToPointeeType)) |
| 906 | return false; |
| 907 | |
Douglas Gregor | 94b1dd2 | 2008-10-24 04:54:22 +0000 | [diff] [blame] | 908 | if (FromPointeeType->isRecordType() && |
| 909 | ToPointeeType->isRecordType()) { |
| 910 | // We must have a derived-to-base conversion. Check an |
| 911 | // ambiguous or inaccessible conversion. |
Douglas Gregor | 0575d4a | 2008-10-24 16:17:19 +0000 | [diff] [blame] | 912 | return CheckDerivedToBaseConversion(FromPointeeType, ToPointeeType, |
| 913 | From->getExprLoc(), |
| 914 | From->getSourceRange()); |
Douglas Gregor | 94b1dd2 | 2008-10-24 04:54:22 +0000 | [diff] [blame] | 915 | } |
| 916 | } |
| 917 | |
| 918 | return false; |
| 919 | } |
| 920 | |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 921 | /// IsQualificationConversion - Determines whether the conversion from |
| 922 | /// an rvalue of type FromType to ToType is a qualification conversion |
| 923 | /// (C++ 4.4). |
| 924 | bool |
| 925 | Sema::IsQualificationConversion(QualType FromType, QualType ToType) |
| 926 | { |
| 927 | FromType = Context.getCanonicalType(FromType); |
| 928 | ToType = Context.getCanonicalType(ToType); |
| 929 | |
| 930 | // If FromType and ToType are the same type, this is not a |
| 931 | // qualification conversion. |
| 932 | if (FromType == ToType) |
| 933 | return false; |
| 934 | |
| 935 | // (C++ 4.4p4): |
| 936 | // A conversion can add cv-qualifiers at levels other than the first |
| 937 | // in multi-level pointers, subject to the following rules: [...] |
| 938 | bool PreviousToQualsIncludeConst = true; |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 939 | bool UnwrappedAnyPointer = false; |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 940 | while (UnwrapSimilarPointerTypes(FromType, ToType)) { |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 941 | // Within each iteration of the loop, we check the qualifiers to |
| 942 | // determine if this still looks like a qualification |
| 943 | // conversion. Then, if all is well, we unwrap one more level of |
Douglas Gregor | f8268ae | 2008-10-22 17:49:05 +0000 | [diff] [blame] | 944 | // pointers or pointers-to-members and do it all again |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 945 | // until there are no more pointers or pointers-to-members left to |
| 946 | // unwrap. |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 947 | UnwrappedAnyPointer = true; |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 948 | |
| 949 | // -- for every j > 0, if const is in cv 1,j then const is in cv |
| 950 | // 2,j, and similarly for volatile. |
Douglas Gregor | 9b6e2d2 | 2008-10-22 00:38:21 +0000 | [diff] [blame] | 951 | if (!ToType.isAtLeastAsQualifiedAs(FromType)) |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 952 | return false; |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 953 | |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 954 | // -- if the cv 1,j and cv 2,j are different, then const is in |
| 955 | // every cv for 0 < k < j. |
| 956 | if (FromType.getCVRQualifiers() != ToType.getCVRQualifiers() |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 957 | && !PreviousToQualsIncludeConst) |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 958 | return false; |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 959 | |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 960 | // Keep track of whether all prior cv-qualifiers in the "to" type |
| 961 | // include const. |
| 962 | PreviousToQualsIncludeConst |
| 963 | = PreviousToQualsIncludeConst && ToType.isConstQualified(); |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 964 | } |
Douglas Gregor | 98cd599 | 2008-10-21 23:43:52 +0000 | [diff] [blame] | 965 | |
| 966 | // We are left with FromType and ToType being the pointee types |
| 967 | // after unwrapping the original FromType and ToType the same number |
| 968 | // of types. If we unwrapped any pointers, and if FromType and |
| 969 | // ToType have the same unqualified type (since we checked |
| 970 | // qualifiers above), then this is a qualification conversion. |
| 971 | return UnwrappedAnyPointer && |
| 972 | FromType.getUnqualifiedType() == ToType.getUnqualifiedType(); |
| 973 | } |
| 974 | |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 975 | /// IsUserDefinedConversion - Determines whether there is a |
| 976 | /// user-defined conversion sequence (C++ [over.ics.user]) that |
| 977 | /// converts expression From to the type ToType. If such a conversion |
| 978 | /// exists, User will contain the user-defined conversion sequence |
| 979 | /// that performs such a conversion and this routine will return |
| 980 | /// true. Otherwise, this routine returns false and User is |
| 981 | /// unspecified. |
| 982 | bool Sema::IsUserDefinedConversion(Expr *From, QualType ToType, |
| 983 | UserDefinedConversionSequence& User) |
| 984 | { |
| 985 | OverloadCandidateSet CandidateSet; |
| 986 | if (const CXXRecordType *ToRecordType |
| 987 | = dyn_cast_or_null<CXXRecordType>(ToType->getAsRecordType())) { |
| 988 | // C++ [over.match.ctor]p1: |
| 989 | // When objects of class type are direct-initialized (8.5), or |
| 990 | // copy-initialized from an expression of the same or a |
| 991 | // derived class type (8.5), overload resolution selects the |
| 992 | // constructor. [...] For copy-initialization, the candidate |
| 993 | // functions are all the converting constructors (12.3.1) of |
| 994 | // that class. The argument list is the expression-list within |
| 995 | // the parentheses of the initializer. |
| 996 | CXXRecordDecl *ToRecordDecl = ToRecordType->getDecl(); |
Douglas Gregor | 9e7d9de | 2008-12-15 21:24:18 +0000 | [diff] [blame] | 997 | DeclarationName ConstructorName |
| 998 | = Context.DeclarationNames.getCXXConstructorName( |
| 999 | Context.getCanonicalType(ToType)); |
| 1000 | DeclContext::lookup_result Lookup |
| 1001 | = ToRecordDecl->lookup(Context, ConstructorName); |
| 1002 | if (Lookup.first == Lookup.second) |
| 1003 | /* No constructors. FIXME: Implicit copy constructor? */; |
| 1004 | else if (OverloadedFunctionDecl *Constructors |
| 1005 | = dyn_cast<OverloadedFunctionDecl>(*Lookup.first)) { |
| 1006 | for (OverloadedFunctionDecl::function_const_iterator func |
| 1007 | = Constructors->function_begin(); |
| 1008 | func != Constructors->function_end(); ++func) { |
| 1009 | CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*func); |
| 1010 | if (Constructor->isConvertingConstructor()) |
| 1011 | AddOverloadCandidate(Constructor, &From, 1, CandidateSet, |
| 1012 | /*SuppressUserConversions=*/true); |
| 1013 | } |
| 1014 | } else if (CXXConstructorDecl *Constructor |
| 1015 | = dyn_cast<CXXConstructorDecl>(*Lookup.first)) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1016 | if (Constructor->isConvertingConstructor()) |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1017 | AddOverloadCandidate(Constructor, &From, 1, CandidateSet, |
| 1018 | /*SuppressUserConversions=*/true); |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1019 | } |
| 1020 | } |
| 1021 | |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1022 | if (const CXXRecordType *FromRecordType |
| 1023 | = dyn_cast_or_null<CXXRecordType>(From->getType()->getAsRecordType())) { |
| 1024 | // Add all of the conversion functions as candidates. |
| 1025 | // FIXME: Look for conversions in base classes! |
| 1026 | CXXRecordDecl *FromRecordDecl = FromRecordType->getDecl(); |
| 1027 | OverloadedFunctionDecl *Conversions |
| 1028 | = FromRecordDecl->getConversionFunctions(); |
| 1029 | for (OverloadedFunctionDecl::function_iterator Func |
| 1030 | = Conversions->function_begin(); |
| 1031 | Func != Conversions->function_end(); ++Func) { |
| 1032 | CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); |
| 1033 | AddConversionCandidate(Conv, From, ToType, CandidateSet); |
| 1034 | } |
| 1035 | } |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1036 | |
| 1037 | OverloadCandidateSet::iterator Best; |
| 1038 | switch (BestViableFunction(CandidateSet, Best)) { |
| 1039 | case OR_Success: |
| 1040 | // Record the standard conversion we used and the conversion function. |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1041 | if (CXXConstructorDecl *Constructor |
| 1042 | = dyn_cast<CXXConstructorDecl>(Best->Function)) { |
| 1043 | // C++ [over.ics.user]p1: |
| 1044 | // If the user-defined conversion is specified by a |
| 1045 | // constructor (12.3.1), the initial standard conversion |
| 1046 | // sequence converts the source type to the type required by |
| 1047 | // the argument of the constructor. |
| 1048 | // |
| 1049 | // FIXME: What about ellipsis conversions? |
| 1050 | QualType ThisType = Constructor->getThisType(Context); |
| 1051 | User.Before = Best->Conversions[0].Standard; |
| 1052 | User.ConversionFunction = Constructor; |
| 1053 | User.After.setAsIdentityConversion(); |
| 1054 | User.After.FromTypePtr |
| 1055 | = ThisType->getAsPointerType()->getPointeeType().getAsOpaquePtr(); |
| 1056 | User.After.ToTypePtr = ToType.getAsOpaquePtr(); |
| 1057 | return true; |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1058 | } else if (CXXConversionDecl *Conversion |
| 1059 | = dyn_cast<CXXConversionDecl>(Best->Function)) { |
| 1060 | // C++ [over.ics.user]p1: |
| 1061 | // |
| 1062 | // [...] If the user-defined conversion is specified by a |
| 1063 | // conversion function (12.3.2), the initial standard |
| 1064 | // conversion sequence converts the source type to the |
| 1065 | // implicit object parameter of the conversion function. |
| 1066 | User.Before = Best->Conversions[0].Standard; |
| 1067 | User.ConversionFunction = Conversion; |
| 1068 | |
| 1069 | // C++ [over.ics.user]p2: |
| 1070 | // The second standard conversion sequence converts the |
| 1071 | // result of the user-defined conversion to the target type |
| 1072 | // for the sequence. Since an implicit conversion sequence |
| 1073 | // is an initialization, the special rules for |
| 1074 | // initialization by user-defined conversion apply when |
| 1075 | // selecting the best user-defined conversion for a |
| 1076 | // user-defined conversion sequence (see 13.3.3 and |
| 1077 | // 13.3.3.1). |
| 1078 | User.After = Best->FinalConversion; |
| 1079 | return true; |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1080 | } else { |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1081 | assert(false && "Not a constructor or conversion function?"); |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1082 | return false; |
| 1083 | } |
| 1084 | |
| 1085 | case OR_No_Viable_Function: |
| 1086 | // No conversion here! We're done. |
| 1087 | return false; |
| 1088 | |
| 1089 | case OR_Ambiguous: |
| 1090 | // FIXME: See C++ [over.best.ics]p10 for the handling of |
| 1091 | // ambiguous conversion sequences. |
| 1092 | return false; |
| 1093 | } |
| 1094 | |
| 1095 | return false; |
| 1096 | } |
| 1097 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1098 | /// CompareImplicitConversionSequences - Compare two implicit |
| 1099 | /// conversion sequences to determine whether one is better than the |
| 1100 | /// other or if they are indistinguishable (C++ 13.3.3.2). |
| 1101 | ImplicitConversionSequence::CompareKind |
| 1102 | Sema::CompareImplicitConversionSequences(const ImplicitConversionSequence& ICS1, |
| 1103 | const ImplicitConversionSequence& ICS2) |
| 1104 | { |
| 1105 | // (C++ 13.3.3.2p2): When comparing the basic forms of implicit |
| 1106 | // conversion sequences (as defined in 13.3.3.1) |
| 1107 | // -- a standard conversion sequence (13.3.3.1.1) is a better |
| 1108 | // conversion sequence than a user-defined conversion sequence or |
| 1109 | // an ellipsis conversion sequence, and |
| 1110 | // -- a user-defined conversion sequence (13.3.3.1.2) is a better |
| 1111 | // conversion sequence than an ellipsis conversion sequence |
| 1112 | // (13.3.3.1.3). |
| 1113 | // |
| 1114 | if (ICS1.ConversionKind < ICS2.ConversionKind) |
| 1115 | return ImplicitConversionSequence::Better; |
| 1116 | else if (ICS2.ConversionKind < ICS1.ConversionKind) |
| 1117 | return ImplicitConversionSequence::Worse; |
| 1118 | |
| 1119 | // Two implicit conversion sequences of the same form are |
| 1120 | // indistinguishable conversion sequences unless one of the |
| 1121 | // following rules apply: (C++ 13.3.3.2p3): |
| 1122 | if (ICS1.ConversionKind == ImplicitConversionSequence::StandardConversion) |
| 1123 | return CompareStandardConversionSequences(ICS1.Standard, ICS2.Standard); |
| 1124 | else if (ICS1.ConversionKind == |
| 1125 | ImplicitConversionSequence::UserDefinedConversion) { |
| 1126 | // User-defined conversion sequence U1 is a better conversion |
| 1127 | // sequence than another user-defined conversion sequence U2 if |
| 1128 | // they contain the same user-defined conversion function or |
| 1129 | // constructor and if the second standard conversion sequence of |
| 1130 | // U1 is better than the second standard conversion sequence of |
| 1131 | // U2 (C++ 13.3.3.2p3). |
| 1132 | if (ICS1.UserDefined.ConversionFunction == |
| 1133 | ICS2.UserDefined.ConversionFunction) |
| 1134 | return CompareStandardConversionSequences(ICS1.UserDefined.After, |
| 1135 | ICS2.UserDefined.After); |
| 1136 | } |
| 1137 | |
| 1138 | return ImplicitConversionSequence::Indistinguishable; |
| 1139 | } |
| 1140 | |
| 1141 | /// CompareStandardConversionSequences - Compare two standard |
| 1142 | /// conversion sequences to determine whether one is better than the |
| 1143 | /// other or if they are indistinguishable (C++ 13.3.3.2p3). |
| 1144 | ImplicitConversionSequence::CompareKind |
| 1145 | Sema::CompareStandardConversionSequences(const StandardConversionSequence& SCS1, |
| 1146 | const StandardConversionSequence& SCS2) |
| 1147 | { |
| 1148 | // Standard conversion sequence S1 is a better conversion sequence |
| 1149 | // than standard conversion sequence S2 if (C++ 13.3.3.2p3): |
| 1150 | |
| 1151 | // -- S1 is a proper subsequence of S2 (comparing the conversion |
| 1152 | // sequences in the canonical form defined by 13.3.3.1.1, |
| 1153 | // excluding any Lvalue Transformation; the identity conversion |
| 1154 | // sequence is considered to be a subsequence of any |
| 1155 | // non-identity conversion sequence) or, if not that, |
| 1156 | if (SCS1.Second == SCS2.Second && SCS1.Third == SCS2.Third) |
| 1157 | // Neither is a proper subsequence of the other. Do nothing. |
| 1158 | ; |
| 1159 | else if ((SCS1.Second == ICK_Identity && SCS1.Third == SCS2.Third) || |
| 1160 | (SCS1.Third == ICK_Identity && SCS1.Second == SCS2.Second) || |
| 1161 | (SCS1.Second == ICK_Identity && |
| 1162 | SCS1.Third == ICK_Identity)) |
| 1163 | // SCS1 is a proper subsequence of SCS2. |
| 1164 | return ImplicitConversionSequence::Better; |
| 1165 | else if ((SCS2.Second == ICK_Identity && SCS2.Third == SCS1.Third) || |
| 1166 | (SCS2.Third == ICK_Identity && SCS2.Second == SCS1.Second) || |
| 1167 | (SCS2.Second == ICK_Identity && |
| 1168 | SCS2.Third == ICK_Identity)) |
| 1169 | // SCS2 is a proper subsequence of SCS1. |
| 1170 | return ImplicitConversionSequence::Worse; |
| 1171 | |
| 1172 | // -- the rank of S1 is better than the rank of S2 (by the rules |
| 1173 | // defined below), or, if not that, |
| 1174 | ImplicitConversionRank Rank1 = SCS1.getRank(); |
| 1175 | ImplicitConversionRank Rank2 = SCS2.getRank(); |
| 1176 | if (Rank1 < Rank2) |
| 1177 | return ImplicitConversionSequence::Better; |
| 1178 | else if (Rank2 < Rank1) |
| 1179 | return ImplicitConversionSequence::Worse; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1180 | |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1181 | // (C++ 13.3.3.2p4): Two conversion sequences with the same rank |
| 1182 | // are indistinguishable unless one of the following rules |
| 1183 | // applies: |
| 1184 | |
| 1185 | // A conversion that is not a conversion of a pointer, or |
| 1186 | // pointer to member, to bool is better than another conversion |
| 1187 | // that is such a conversion. |
| 1188 | if (SCS1.isPointerConversionToBool() != SCS2.isPointerConversionToBool()) |
| 1189 | return SCS2.isPointerConversionToBool() |
| 1190 | ? ImplicitConversionSequence::Better |
| 1191 | : ImplicitConversionSequence::Worse; |
| 1192 | |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1193 | // C++ [over.ics.rank]p4b2: |
| 1194 | // |
| 1195 | // If class B is derived directly or indirectly from class A, |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1196 | // conversion of B* to A* is better than conversion of B* to |
| 1197 | // void*, and conversion of A* to void* is better than conversion |
| 1198 | // of B* to void*. |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1199 | bool SCS1ConvertsToVoid |
| 1200 | = SCS1.isPointerConversionToVoidPointer(Context); |
| 1201 | bool SCS2ConvertsToVoid |
| 1202 | = SCS2.isPointerConversionToVoidPointer(Context); |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1203 | if (SCS1ConvertsToVoid != SCS2ConvertsToVoid) { |
| 1204 | // Exactly one of the conversion sequences is a conversion to |
| 1205 | // a void pointer; it's the worse conversion. |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1206 | return SCS2ConvertsToVoid ? ImplicitConversionSequence::Better |
| 1207 | : ImplicitConversionSequence::Worse; |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1208 | } else if (!SCS1ConvertsToVoid && !SCS2ConvertsToVoid) { |
| 1209 | // Neither conversion sequence converts to a void pointer; compare |
| 1210 | // their derived-to-base conversions. |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1211 | if (ImplicitConversionSequence::CompareKind DerivedCK |
| 1212 | = CompareDerivedToBaseConversions(SCS1, SCS2)) |
| 1213 | return DerivedCK; |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1214 | } else if (SCS1ConvertsToVoid && SCS2ConvertsToVoid) { |
| 1215 | // Both conversion sequences are conversions to void |
| 1216 | // pointers. Compare the source types to determine if there's an |
| 1217 | // inheritance relationship in their sources. |
| 1218 | QualType FromType1 = QualType::getFromOpaquePtr(SCS1.FromTypePtr); |
| 1219 | QualType FromType2 = QualType::getFromOpaquePtr(SCS2.FromTypePtr); |
| 1220 | |
| 1221 | // Adjust the types we're converting from via the array-to-pointer |
| 1222 | // conversion, if we need to. |
| 1223 | if (SCS1.First == ICK_Array_To_Pointer) |
| 1224 | FromType1 = Context.getArrayDecayedType(FromType1); |
| 1225 | if (SCS2.First == ICK_Array_To_Pointer) |
| 1226 | FromType2 = Context.getArrayDecayedType(FromType2); |
| 1227 | |
| 1228 | QualType FromPointee1 |
| 1229 | = FromType1->getAsPointerType()->getPointeeType().getUnqualifiedType(); |
| 1230 | QualType FromPointee2 |
| 1231 | = FromType2->getAsPointerType()->getPointeeType().getUnqualifiedType(); |
| 1232 | |
| 1233 | if (IsDerivedFrom(FromPointee2, FromPointee1)) |
| 1234 | return ImplicitConversionSequence::Better; |
| 1235 | else if (IsDerivedFrom(FromPointee1, FromPointee2)) |
| 1236 | return ImplicitConversionSequence::Worse; |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 1237 | |
| 1238 | // Objective-C++: If one interface is more specific than the |
| 1239 | // other, it is the better one. |
| 1240 | const ObjCInterfaceType* FromIface1 = FromPointee1->getAsObjCInterfaceType(); |
| 1241 | const ObjCInterfaceType* FromIface2 = FromPointee2->getAsObjCInterfaceType(); |
| 1242 | if (FromIface1 && FromIface1) { |
| 1243 | if (Context.canAssignObjCInterfaces(FromIface2, FromIface1)) |
| 1244 | return ImplicitConversionSequence::Better; |
| 1245 | else if (Context.canAssignObjCInterfaces(FromIface1, FromIface2)) |
| 1246 | return ImplicitConversionSequence::Worse; |
| 1247 | } |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1248 | } |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1249 | |
| 1250 | // Compare based on qualification conversions (C++ 13.3.3.2p3, |
| 1251 | // bullet 3). |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1252 | if (ImplicitConversionSequence::CompareKind QualCK |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1253 | = CompareQualificationConversions(SCS1, SCS2)) |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1254 | return QualCK; |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1255 | |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1256 | // C++ [over.ics.rank]p3b4: |
| 1257 | // -- S1 and S2 are reference bindings (8.5.3), and the types to |
| 1258 | // which the references refer are the same type except for |
| 1259 | // top-level cv-qualifiers, and the type to which the reference |
| 1260 | // initialized by S2 refers is more cv-qualified than the type |
| 1261 | // to which the reference initialized by S1 refers. |
| 1262 | if (SCS1.ReferenceBinding && SCS2.ReferenceBinding) { |
| 1263 | QualType T1 = QualType::getFromOpaquePtr(SCS1.ToTypePtr); |
| 1264 | QualType T2 = QualType::getFromOpaquePtr(SCS2.ToTypePtr); |
| 1265 | T1 = Context.getCanonicalType(T1); |
| 1266 | T2 = Context.getCanonicalType(T2); |
| 1267 | if (T1.getUnqualifiedType() == T2.getUnqualifiedType()) { |
| 1268 | if (T2.isMoreQualifiedThan(T1)) |
| 1269 | return ImplicitConversionSequence::Better; |
| 1270 | else if (T1.isMoreQualifiedThan(T2)) |
| 1271 | return ImplicitConversionSequence::Worse; |
| 1272 | } |
| 1273 | } |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1274 | |
| 1275 | return ImplicitConversionSequence::Indistinguishable; |
| 1276 | } |
| 1277 | |
| 1278 | /// CompareQualificationConversions - Compares two standard conversion |
| 1279 | /// sequences to determine whether they can be ranked based on their |
| 1280 | /// qualification conversions (C++ 13.3.3.2p3 bullet 3). |
| 1281 | ImplicitConversionSequence::CompareKind |
| 1282 | Sema::CompareQualificationConversions(const StandardConversionSequence& SCS1, |
| 1283 | const StandardConversionSequence& SCS2) |
| 1284 | { |
Douglas Gregor | ba7e210 | 2008-10-22 15:04:37 +0000 | [diff] [blame] | 1285 | // C++ 13.3.3.2p3: |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1286 | // -- S1 and S2 differ only in their qualification conversion and |
| 1287 | // yield similar types T1 and T2 (C++ 4.4), respectively, and the |
| 1288 | // cv-qualification signature of type T1 is a proper subset of |
| 1289 | // the cv-qualification signature of type T2, and S1 is not the |
| 1290 | // deprecated string literal array-to-pointer conversion (4.2). |
| 1291 | if (SCS1.First != SCS2.First || SCS1.Second != SCS2.Second || |
| 1292 | SCS1.Third != SCS2.Third || SCS1.Third != ICK_Qualification) |
| 1293 | return ImplicitConversionSequence::Indistinguishable; |
| 1294 | |
| 1295 | // FIXME: the example in the standard doesn't use a qualification |
| 1296 | // conversion (!) |
| 1297 | QualType T1 = QualType::getFromOpaquePtr(SCS1.ToTypePtr); |
| 1298 | QualType T2 = QualType::getFromOpaquePtr(SCS2.ToTypePtr); |
| 1299 | T1 = Context.getCanonicalType(T1); |
| 1300 | T2 = Context.getCanonicalType(T2); |
| 1301 | |
| 1302 | // If the types are the same, we won't learn anything by unwrapped |
| 1303 | // them. |
| 1304 | if (T1.getUnqualifiedType() == T2.getUnqualifiedType()) |
| 1305 | return ImplicitConversionSequence::Indistinguishable; |
| 1306 | |
| 1307 | ImplicitConversionSequence::CompareKind Result |
| 1308 | = ImplicitConversionSequence::Indistinguishable; |
| 1309 | while (UnwrapSimilarPointerTypes(T1, T2)) { |
| 1310 | // Within each iteration of the loop, we check the qualifiers to |
| 1311 | // determine if this still looks like a qualification |
| 1312 | // conversion. Then, if all is well, we unwrap one more level of |
Douglas Gregor | f8268ae | 2008-10-22 17:49:05 +0000 | [diff] [blame] | 1313 | // pointers or pointers-to-members and do it all again |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1314 | // until there are no more pointers or pointers-to-members left |
| 1315 | // to unwrap. This essentially mimics what |
| 1316 | // IsQualificationConversion does, but here we're checking for a |
| 1317 | // strict subset of qualifiers. |
| 1318 | if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) |
| 1319 | // The qualifiers are the same, so this doesn't tell us anything |
| 1320 | // about how the sequences rank. |
| 1321 | ; |
| 1322 | else if (T2.isMoreQualifiedThan(T1)) { |
| 1323 | // T1 has fewer qualifiers, so it could be the better sequence. |
| 1324 | if (Result == ImplicitConversionSequence::Worse) |
| 1325 | // Neither has qualifiers that are a subset of the other's |
| 1326 | // qualifiers. |
| 1327 | return ImplicitConversionSequence::Indistinguishable; |
| 1328 | |
| 1329 | Result = ImplicitConversionSequence::Better; |
| 1330 | } else if (T1.isMoreQualifiedThan(T2)) { |
| 1331 | // T2 has fewer qualifiers, so it could be the better sequence. |
| 1332 | if (Result == ImplicitConversionSequence::Better) |
| 1333 | // Neither has qualifiers that are a subset of the other's |
| 1334 | // qualifiers. |
| 1335 | return ImplicitConversionSequence::Indistinguishable; |
| 1336 | |
| 1337 | Result = ImplicitConversionSequence::Worse; |
| 1338 | } else { |
| 1339 | // Qualifiers are disjoint. |
| 1340 | return ImplicitConversionSequence::Indistinguishable; |
| 1341 | } |
| 1342 | |
| 1343 | // If the types after this point are equivalent, we're done. |
| 1344 | if (T1.getUnqualifiedType() == T2.getUnqualifiedType()) |
| 1345 | break; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1346 | } |
| 1347 | |
Douglas Gregor | 5737326 | 2008-10-22 14:17:15 +0000 | [diff] [blame] | 1348 | // Check that the winning standard conversion sequence isn't using |
| 1349 | // the deprecated string literal array to pointer conversion. |
| 1350 | switch (Result) { |
| 1351 | case ImplicitConversionSequence::Better: |
| 1352 | if (SCS1.Deprecated) |
| 1353 | Result = ImplicitConversionSequence::Indistinguishable; |
| 1354 | break; |
| 1355 | |
| 1356 | case ImplicitConversionSequence::Indistinguishable: |
| 1357 | break; |
| 1358 | |
| 1359 | case ImplicitConversionSequence::Worse: |
| 1360 | if (SCS2.Deprecated) |
| 1361 | Result = ImplicitConversionSequence::Indistinguishable; |
| 1362 | break; |
| 1363 | } |
| 1364 | |
| 1365 | return Result; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1366 | } |
| 1367 | |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1368 | /// CompareDerivedToBaseConversions - Compares two standard conversion |
| 1369 | /// sequences to determine whether they can be ranked based on their |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 1370 | /// various kinds of derived-to-base conversions (C++ |
| 1371 | /// [over.ics.rank]p4b3). As part of these checks, we also look at |
| 1372 | /// conversions between Objective-C interface types. |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1373 | ImplicitConversionSequence::CompareKind |
| 1374 | Sema::CompareDerivedToBaseConversions(const StandardConversionSequence& SCS1, |
| 1375 | const StandardConversionSequence& SCS2) { |
| 1376 | QualType FromType1 = QualType::getFromOpaquePtr(SCS1.FromTypePtr); |
| 1377 | QualType ToType1 = QualType::getFromOpaquePtr(SCS1.ToTypePtr); |
| 1378 | QualType FromType2 = QualType::getFromOpaquePtr(SCS2.FromTypePtr); |
| 1379 | QualType ToType2 = QualType::getFromOpaquePtr(SCS2.ToTypePtr); |
| 1380 | |
| 1381 | // Adjust the types we're converting from via the array-to-pointer |
| 1382 | // conversion, if we need to. |
| 1383 | if (SCS1.First == ICK_Array_To_Pointer) |
| 1384 | FromType1 = Context.getArrayDecayedType(FromType1); |
| 1385 | if (SCS2.First == ICK_Array_To_Pointer) |
| 1386 | FromType2 = Context.getArrayDecayedType(FromType2); |
| 1387 | |
| 1388 | // Canonicalize all of the types. |
| 1389 | FromType1 = Context.getCanonicalType(FromType1); |
| 1390 | ToType1 = Context.getCanonicalType(ToType1); |
| 1391 | FromType2 = Context.getCanonicalType(FromType2); |
| 1392 | ToType2 = Context.getCanonicalType(ToType2); |
| 1393 | |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1394 | // C++ [over.ics.rank]p4b3: |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1395 | // |
| 1396 | // If class B is derived directly or indirectly from class A and |
| 1397 | // class C is derived directly or indirectly from B, |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 1398 | // |
| 1399 | // For Objective-C, we let A, B, and C also be Objective-C |
| 1400 | // interfaces. |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1401 | |
| 1402 | // Compare based on pointer conversions. |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1403 | if (SCS1.Second == ICK_Pointer_Conversion && |
Douglas Gregor | 7ca0976 | 2008-11-27 01:19:21 +0000 | [diff] [blame] | 1404 | SCS2.Second == ICK_Pointer_Conversion && |
| 1405 | /*FIXME: Remove if Objective-C id conversions get their own rank*/ |
| 1406 | FromType1->isPointerType() && FromType2->isPointerType() && |
| 1407 | ToType1->isPointerType() && ToType2->isPointerType()) { |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1408 | QualType FromPointee1 |
| 1409 | = FromType1->getAsPointerType()->getPointeeType().getUnqualifiedType(); |
| 1410 | QualType ToPointee1 |
| 1411 | = ToType1->getAsPointerType()->getPointeeType().getUnqualifiedType(); |
| 1412 | QualType FromPointee2 |
| 1413 | = FromType2->getAsPointerType()->getPointeeType().getUnqualifiedType(); |
| 1414 | QualType ToPointee2 |
| 1415 | = ToType2->getAsPointerType()->getPointeeType().getUnqualifiedType(); |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 1416 | |
| 1417 | const ObjCInterfaceType* FromIface1 = FromPointee1->getAsObjCInterfaceType(); |
| 1418 | const ObjCInterfaceType* FromIface2 = FromPointee2->getAsObjCInterfaceType(); |
| 1419 | const ObjCInterfaceType* ToIface1 = ToPointee1->getAsObjCInterfaceType(); |
| 1420 | const ObjCInterfaceType* ToIface2 = ToPointee2->getAsObjCInterfaceType(); |
| 1421 | |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1422 | // -- conversion of C* to B* is better than conversion of C* to A*, |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1423 | if (FromPointee1 == FromPointee2 && ToPointee1 != ToPointee2) { |
| 1424 | if (IsDerivedFrom(ToPointee1, ToPointee2)) |
| 1425 | return ImplicitConversionSequence::Better; |
| 1426 | else if (IsDerivedFrom(ToPointee2, ToPointee1)) |
| 1427 | return ImplicitConversionSequence::Worse; |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 1428 | |
| 1429 | if (ToIface1 && ToIface2) { |
| 1430 | if (Context.canAssignObjCInterfaces(ToIface2, ToIface1)) |
| 1431 | return ImplicitConversionSequence::Better; |
| 1432 | else if (Context.canAssignObjCInterfaces(ToIface1, ToIface2)) |
| 1433 | return ImplicitConversionSequence::Worse; |
| 1434 | } |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1435 | } |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1436 | |
| 1437 | // -- conversion of B* to A* is better than conversion of C* to A*, |
| 1438 | if (FromPointee1 != FromPointee2 && ToPointee1 == ToPointee2) { |
| 1439 | if (IsDerivedFrom(FromPointee2, FromPointee1)) |
| 1440 | return ImplicitConversionSequence::Better; |
| 1441 | else if (IsDerivedFrom(FromPointee1, FromPointee2)) |
| 1442 | return ImplicitConversionSequence::Worse; |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 1443 | |
| 1444 | if (FromIface1 && FromIface2) { |
| 1445 | if (Context.canAssignObjCInterfaces(FromIface1, FromIface2)) |
| 1446 | return ImplicitConversionSequence::Better; |
| 1447 | else if (Context.canAssignObjCInterfaces(FromIface2, FromIface1)) |
| 1448 | return ImplicitConversionSequence::Worse; |
| 1449 | } |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1450 | } |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1451 | } |
| 1452 | |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1453 | // Compare based on reference bindings. |
| 1454 | if (SCS1.ReferenceBinding && SCS2.ReferenceBinding && |
| 1455 | SCS1.Second == ICK_Derived_To_Base) { |
| 1456 | // -- binding of an expression of type C to a reference of type |
| 1457 | // B& is better than binding an expression of type C to a |
| 1458 | // reference of type A&, |
| 1459 | if (FromType1.getUnqualifiedType() == FromType2.getUnqualifiedType() && |
| 1460 | ToType1.getUnqualifiedType() != ToType2.getUnqualifiedType()) { |
| 1461 | if (IsDerivedFrom(ToType1, ToType2)) |
| 1462 | return ImplicitConversionSequence::Better; |
| 1463 | else if (IsDerivedFrom(ToType2, ToType1)) |
| 1464 | return ImplicitConversionSequence::Worse; |
| 1465 | } |
| 1466 | |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1467 | // -- binding of an expression of type B to a reference of type |
| 1468 | // A& is better than binding an expression of type C to a |
| 1469 | // reference of type A&, |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1470 | if (FromType1.getUnqualifiedType() != FromType2.getUnqualifiedType() && |
| 1471 | ToType1.getUnqualifiedType() == ToType2.getUnqualifiedType()) { |
| 1472 | if (IsDerivedFrom(FromType2, FromType1)) |
| 1473 | return ImplicitConversionSequence::Better; |
| 1474 | else if (IsDerivedFrom(FromType1, FromType2)) |
| 1475 | return ImplicitConversionSequence::Worse; |
| 1476 | } |
| 1477 | } |
| 1478 | |
| 1479 | |
| 1480 | // FIXME: conversion of A::* to B::* is better than conversion of |
| 1481 | // A::* to C::*, |
| 1482 | |
| 1483 | // FIXME: conversion of B::* to C::* is better than conversion of |
| 1484 | // A::* to C::*, and |
| 1485 | |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1486 | if (SCS1.CopyConstructor && SCS2.CopyConstructor && |
| 1487 | SCS1.Second == ICK_Derived_To_Base) { |
| 1488 | // -- conversion of C to B is better than conversion of C to A, |
| 1489 | if (FromType1.getUnqualifiedType() == FromType2.getUnqualifiedType() && |
| 1490 | ToType1.getUnqualifiedType() != ToType2.getUnqualifiedType()) { |
| 1491 | if (IsDerivedFrom(ToType1, ToType2)) |
| 1492 | return ImplicitConversionSequence::Better; |
| 1493 | else if (IsDerivedFrom(ToType2, ToType1)) |
| 1494 | return ImplicitConversionSequence::Worse; |
| 1495 | } |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1496 | |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1497 | // -- conversion of B to A is better than conversion of C to A. |
| 1498 | if (FromType1.getUnqualifiedType() != FromType2.getUnqualifiedType() && |
| 1499 | ToType1.getUnqualifiedType() == ToType2.getUnqualifiedType()) { |
| 1500 | if (IsDerivedFrom(FromType2, FromType1)) |
| 1501 | return ImplicitConversionSequence::Better; |
| 1502 | else if (IsDerivedFrom(FromType1, FromType2)) |
| 1503 | return ImplicitConversionSequence::Worse; |
| 1504 | } |
| 1505 | } |
Douglas Gregor | f70bdb9 | 2008-10-29 14:50:44 +0000 | [diff] [blame] | 1506 | |
Douglas Gregor | bc0805a | 2008-10-23 00:40:37 +0000 | [diff] [blame] | 1507 | return ImplicitConversionSequence::Indistinguishable; |
| 1508 | } |
| 1509 | |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1510 | /// TryCopyInitialization - Try to copy-initialize a value of type |
| 1511 | /// ToType from the expression From. Return the implicit conversion |
| 1512 | /// sequence required to pass this argument, which may be a bad |
| 1513 | /// conversion sequence (meaning that the argument cannot be passed to |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1514 | /// a parameter of this type). If @p SuppressUserConversions, then we |
| 1515 | /// do not permit any user-defined conversion sequences. |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1516 | ImplicitConversionSequence |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1517 | Sema::TryCopyInitialization(Expr *From, QualType ToType, |
| 1518 | bool SuppressUserConversions) { |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1519 | if (!getLangOptions().CPlusPlus) { |
Douglas Gregor | 60d62c2 | 2008-10-31 16:23:19 +0000 | [diff] [blame] | 1520 | // In C, copy initialization is the same as performing an assignment. |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1521 | AssignConvertType ConvTy = |
| 1522 | CheckSingleAssignmentConstraints(ToType, From); |
| 1523 | ImplicitConversionSequence ICS; |
| 1524 | if (getLangOptions().NoExtensions? ConvTy != Compatible |
| 1525 | : ConvTy == Incompatible) |
| 1526 | ICS.ConversionKind = ImplicitConversionSequence::BadConversion; |
| 1527 | else |
| 1528 | ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; |
| 1529 | return ICS; |
| 1530 | } else if (ToType->isReferenceType()) { |
| 1531 | ImplicitConversionSequence ICS; |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1532 | CheckReferenceInit(From, ToType, &ICS, SuppressUserConversions); |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1533 | return ICS; |
| 1534 | } else { |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1535 | return TryImplicitConversion(From, ToType, SuppressUserConversions); |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1536 | } |
| 1537 | } |
| 1538 | |
| 1539 | /// PerformArgumentPassing - Pass the argument Arg into a parameter of |
| 1540 | /// type ToType. Returns true (and emits a diagnostic) if there was |
| 1541 | /// an error, returns false if the initialization succeeded. |
| 1542 | bool Sema::PerformCopyInitialization(Expr *&From, QualType ToType, |
| 1543 | const char* Flavor) { |
| 1544 | if (!getLangOptions().CPlusPlus) { |
| 1545 | // In C, argument passing is the same as performing an assignment. |
| 1546 | QualType FromType = From->getType(); |
| 1547 | AssignConvertType ConvTy = |
| 1548 | CheckSingleAssignmentConstraints(ToType, From); |
| 1549 | |
| 1550 | return DiagnoseAssignmentResult(ConvTy, From->getLocStart(), ToType, |
| 1551 | FromType, From, Flavor); |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1552 | } |
Chris Lattner | d9d22dd | 2008-11-24 05:29:24 +0000 | [diff] [blame] | 1553 | |
| 1554 | if (ToType->isReferenceType()) |
| 1555 | return CheckReferenceInit(From, ToType); |
| 1556 | |
Douglas Gregor | 45920e8 | 2008-12-19 17:40:08 +0000 | [diff] [blame] | 1557 | if (!PerformImplicitConversion(From, ToType, Flavor)) |
Chris Lattner | d9d22dd | 2008-11-24 05:29:24 +0000 | [diff] [blame] | 1558 | return false; |
| 1559 | |
| 1560 | return Diag(From->getSourceRange().getBegin(), |
| 1561 | diag::err_typecheck_convert_incompatible) |
| 1562 | << ToType << From->getType() << Flavor << From->getSourceRange(); |
Douglas Gregor | 27c8dc0 | 2008-10-29 00:13:59 +0000 | [diff] [blame] | 1563 | } |
| 1564 | |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1565 | /// TryObjectArgumentInitialization - Try to initialize the object |
| 1566 | /// parameter of the given member function (@c Method) from the |
| 1567 | /// expression @p From. |
| 1568 | ImplicitConversionSequence |
| 1569 | Sema::TryObjectArgumentInitialization(Expr *From, CXXMethodDecl *Method) { |
| 1570 | QualType ClassType = Context.getTypeDeclType(Method->getParent()); |
| 1571 | unsigned MethodQuals = Method->getTypeQualifiers(); |
| 1572 | QualType ImplicitParamType = ClassType.getQualifiedType(MethodQuals); |
| 1573 | |
| 1574 | // Set up the conversion sequence as a "bad" conversion, to allow us |
| 1575 | // to exit early. |
| 1576 | ImplicitConversionSequence ICS; |
| 1577 | ICS.Standard.setAsIdentityConversion(); |
| 1578 | ICS.ConversionKind = ImplicitConversionSequence::BadConversion; |
| 1579 | |
| 1580 | // We need to have an object of class type. |
| 1581 | QualType FromType = From->getType(); |
| 1582 | if (!FromType->isRecordType()) |
| 1583 | return ICS; |
| 1584 | |
| 1585 | // The implicit object parmeter is has the type "reference to cv X", |
| 1586 | // where X is the class of which the function is a member |
| 1587 | // (C++ [over.match.funcs]p4). However, when finding an implicit |
| 1588 | // conversion sequence for the argument, we are not allowed to |
| 1589 | // create temporaries or perform user-defined conversions |
| 1590 | // (C++ [over.match.funcs]p5). We perform a simplified version of |
| 1591 | // reference binding here, that allows class rvalues to bind to |
| 1592 | // non-constant references. |
| 1593 | |
| 1594 | // First check the qualifiers. We don't care about lvalue-vs-rvalue |
| 1595 | // with the implicit object parameter (C++ [over.match.funcs]p5). |
| 1596 | QualType FromTypeCanon = Context.getCanonicalType(FromType); |
| 1597 | if (ImplicitParamType.getCVRQualifiers() != FromType.getCVRQualifiers() && |
| 1598 | !ImplicitParamType.isAtLeastAsQualifiedAs(FromType)) |
| 1599 | return ICS; |
| 1600 | |
| 1601 | // Check that we have either the same type or a derived type. It |
| 1602 | // affects the conversion rank. |
| 1603 | QualType ClassTypeCanon = Context.getCanonicalType(ClassType); |
| 1604 | if (ClassTypeCanon == FromTypeCanon.getUnqualifiedType()) |
| 1605 | ICS.Standard.Second = ICK_Identity; |
| 1606 | else if (IsDerivedFrom(FromType, ClassType)) |
| 1607 | ICS.Standard.Second = ICK_Derived_To_Base; |
| 1608 | else |
| 1609 | return ICS; |
| 1610 | |
| 1611 | // Success. Mark this as a reference binding. |
| 1612 | ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; |
| 1613 | ICS.Standard.FromTypePtr = FromType.getAsOpaquePtr(); |
| 1614 | ICS.Standard.ToTypePtr = ImplicitParamType.getAsOpaquePtr(); |
| 1615 | ICS.Standard.ReferenceBinding = true; |
| 1616 | ICS.Standard.DirectBinding = true; |
| 1617 | return ICS; |
| 1618 | } |
| 1619 | |
| 1620 | /// PerformObjectArgumentInitialization - Perform initialization of |
| 1621 | /// the implicit object parameter for the given Method with the given |
| 1622 | /// expression. |
| 1623 | bool |
| 1624 | Sema::PerformObjectArgumentInitialization(Expr *&From, CXXMethodDecl *Method) { |
| 1625 | QualType ImplicitParamType |
| 1626 | = Method->getThisType(Context)->getAsPointerType()->getPointeeType(); |
| 1627 | ImplicitConversionSequence ICS |
| 1628 | = TryObjectArgumentInitialization(From, Method); |
| 1629 | if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) |
| 1630 | return Diag(From->getSourceRange().getBegin(), |
Chris Lattner | fa25bbb | 2008-11-19 05:08:23 +0000 | [diff] [blame] | 1631 | diag::err_implicit_object_parameter_init) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 1632 | << ImplicitParamType << From->getType() << From->getSourceRange(); |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1633 | |
| 1634 | if (ICS.Standard.Second == ICK_Derived_To_Base && |
| 1635 | CheckDerivedToBaseConversion(From->getType(), ImplicitParamType, |
| 1636 | From->getSourceRange().getBegin(), |
| 1637 | From->getSourceRange())) |
| 1638 | return true; |
| 1639 | |
| 1640 | ImpCastExprToType(From, ImplicitParamType, /*isLvalue=*/true); |
| 1641 | return false; |
| 1642 | } |
| 1643 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1644 | /// AddOverloadCandidate - Adds the given function to the set of |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1645 | /// candidate functions, using the given function call arguments. If |
| 1646 | /// @p SuppressUserConversions, then don't allow user-defined |
| 1647 | /// conversions via constructors or conversion operators. |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1648 | void |
| 1649 | Sema::AddOverloadCandidate(FunctionDecl *Function, |
| 1650 | Expr **Args, unsigned NumArgs, |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1651 | OverloadCandidateSet& CandidateSet, |
| 1652 | bool SuppressUserConversions) |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1653 | { |
| 1654 | const FunctionTypeProto* Proto |
| 1655 | = dyn_cast<FunctionTypeProto>(Function->getType()->getAsFunctionType()); |
| 1656 | assert(Proto && "Functions without a prototype cannot be overloaded"); |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1657 | assert(!isa<CXXConversionDecl>(Function) && |
| 1658 | "Use AddConversionCandidate for conversion functions"); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1659 | |
| 1660 | // Add this candidate |
| 1661 | CandidateSet.push_back(OverloadCandidate()); |
| 1662 | OverloadCandidate& Candidate = CandidateSet.back(); |
| 1663 | Candidate.Function = Function; |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 1664 | Candidate.IsSurrogate = false; |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1665 | |
| 1666 | unsigned NumArgsInProto = Proto->getNumArgs(); |
| 1667 | |
| 1668 | // (C++ 13.3.2p2): A candidate function having fewer than m |
| 1669 | // parameters is viable only if it has an ellipsis in its parameter |
| 1670 | // list (8.3.5). |
| 1671 | if (NumArgs > NumArgsInProto && !Proto->isVariadic()) { |
| 1672 | Candidate.Viable = false; |
| 1673 | return; |
| 1674 | } |
| 1675 | |
| 1676 | // (C++ 13.3.2p2): A candidate function having more than m parameters |
| 1677 | // is viable only if the (m+1)st parameter has a default argument |
| 1678 | // (8.3.6). For the purposes of overload resolution, the |
| 1679 | // parameter list is truncated on the right, so that there are |
| 1680 | // exactly m parameters. |
| 1681 | unsigned MinRequiredArgs = Function->getMinRequiredArguments(); |
| 1682 | if (NumArgs < MinRequiredArgs) { |
| 1683 | // Not enough arguments. |
| 1684 | Candidate.Viable = false; |
| 1685 | return; |
| 1686 | } |
| 1687 | |
| 1688 | // Determine the implicit conversion sequences for each of the |
| 1689 | // arguments. |
| 1690 | Candidate.Viable = true; |
| 1691 | Candidate.Conversions.resize(NumArgs); |
| 1692 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { |
| 1693 | if (ArgIdx < NumArgsInProto) { |
| 1694 | // (C++ 13.3.2p3): for F to be a viable function, there shall |
| 1695 | // exist for each argument an implicit conversion sequence |
| 1696 | // (13.3.3.1) that converts that argument to the corresponding |
| 1697 | // parameter of F. |
| 1698 | QualType ParamType = Proto->getArgType(ArgIdx); |
| 1699 | Candidate.Conversions[ArgIdx] |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 1700 | = TryCopyInitialization(Args[ArgIdx], ParamType, |
| 1701 | SuppressUserConversions); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1702 | if (Candidate.Conversions[ArgIdx].ConversionKind |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1703 | == ImplicitConversionSequence::BadConversion) { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1704 | Candidate.Viable = false; |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1705 | break; |
| 1706 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 1707 | } else { |
| 1708 | // (C++ 13.3.2p2): For the purposes of overload resolution, any |
| 1709 | // argument for which there is no corresponding parameter is |
| 1710 | // considered to ""match the ellipsis" (C+ 13.3.3.1.3). |
| 1711 | Candidate.Conversions[ArgIdx].ConversionKind |
| 1712 | = ImplicitConversionSequence::EllipsisConversion; |
| 1713 | } |
| 1714 | } |
| 1715 | } |
| 1716 | |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1717 | /// AddMethodCandidate - Adds the given C++ member function to the set |
| 1718 | /// of candidate functions, using the given function call arguments |
| 1719 | /// and the object argument (@c Object). For example, in a call |
| 1720 | /// @c o.f(a1,a2), @c Object will contain @c o and @c Args will contain |
| 1721 | /// both @c a1 and @c a2. If @p SuppressUserConversions, then don't |
| 1722 | /// allow user-defined conversions via constructors or conversion |
| 1723 | /// operators. |
| 1724 | void |
| 1725 | Sema::AddMethodCandidate(CXXMethodDecl *Method, Expr *Object, |
| 1726 | Expr **Args, unsigned NumArgs, |
| 1727 | OverloadCandidateSet& CandidateSet, |
| 1728 | bool SuppressUserConversions) |
| 1729 | { |
| 1730 | const FunctionTypeProto* Proto |
| 1731 | = dyn_cast<FunctionTypeProto>(Method->getType()->getAsFunctionType()); |
| 1732 | assert(Proto && "Methods without a prototype cannot be overloaded"); |
| 1733 | assert(!isa<CXXConversionDecl>(Method) && |
| 1734 | "Use AddConversionCandidate for conversion functions"); |
| 1735 | |
| 1736 | // Add this candidate |
| 1737 | CandidateSet.push_back(OverloadCandidate()); |
| 1738 | OverloadCandidate& Candidate = CandidateSet.back(); |
| 1739 | Candidate.Function = Method; |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 1740 | Candidate.IsSurrogate = false; |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1741 | |
| 1742 | unsigned NumArgsInProto = Proto->getNumArgs(); |
| 1743 | |
| 1744 | // (C++ 13.3.2p2): A candidate function having fewer than m |
| 1745 | // parameters is viable only if it has an ellipsis in its parameter |
| 1746 | // list (8.3.5). |
| 1747 | if (NumArgs > NumArgsInProto && !Proto->isVariadic()) { |
| 1748 | Candidate.Viable = false; |
| 1749 | return; |
| 1750 | } |
| 1751 | |
| 1752 | // (C++ 13.3.2p2): A candidate function having more than m parameters |
| 1753 | // is viable only if the (m+1)st parameter has a default argument |
| 1754 | // (8.3.6). For the purposes of overload resolution, the |
| 1755 | // parameter list is truncated on the right, so that there are |
| 1756 | // exactly m parameters. |
| 1757 | unsigned MinRequiredArgs = Method->getMinRequiredArguments(); |
| 1758 | if (NumArgs < MinRequiredArgs) { |
| 1759 | // Not enough arguments. |
| 1760 | Candidate.Viable = false; |
| 1761 | return; |
| 1762 | } |
| 1763 | |
| 1764 | Candidate.Viable = true; |
| 1765 | Candidate.Conversions.resize(NumArgs + 1); |
| 1766 | |
| 1767 | // Determine the implicit conversion sequence for the object |
| 1768 | // parameter. |
| 1769 | Candidate.Conversions[0] = TryObjectArgumentInitialization(Object, Method); |
| 1770 | if (Candidate.Conversions[0].ConversionKind |
| 1771 | == ImplicitConversionSequence::BadConversion) { |
| 1772 | Candidate.Viable = false; |
| 1773 | return; |
| 1774 | } |
| 1775 | |
| 1776 | // Determine the implicit conversion sequences for each of the |
| 1777 | // arguments. |
| 1778 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { |
| 1779 | if (ArgIdx < NumArgsInProto) { |
| 1780 | // (C++ 13.3.2p3): for F to be a viable function, there shall |
| 1781 | // exist for each argument an implicit conversion sequence |
| 1782 | // (13.3.3.1) that converts that argument to the corresponding |
| 1783 | // parameter of F. |
| 1784 | QualType ParamType = Proto->getArgType(ArgIdx); |
| 1785 | Candidate.Conversions[ArgIdx + 1] |
| 1786 | = TryCopyInitialization(Args[ArgIdx], ParamType, |
| 1787 | SuppressUserConversions); |
| 1788 | if (Candidate.Conversions[ArgIdx + 1].ConversionKind |
| 1789 | == ImplicitConversionSequence::BadConversion) { |
| 1790 | Candidate.Viable = false; |
| 1791 | break; |
| 1792 | } |
| 1793 | } else { |
| 1794 | // (C++ 13.3.2p2): For the purposes of overload resolution, any |
| 1795 | // argument for which there is no corresponding parameter is |
| 1796 | // considered to ""match the ellipsis" (C+ 13.3.3.1.3). |
| 1797 | Candidate.Conversions[ArgIdx + 1].ConversionKind |
| 1798 | = ImplicitConversionSequence::EllipsisConversion; |
| 1799 | } |
| 1800 | } |
| 1801 | } |
| 1802 | |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1803 | /// AddConversionCandidate - Add a C++ conversion function as a |
| 1804 | /// candidate in the candidate set (C++ [over.match.conv], |
| 1805 | /// C++ [over.match.copy]). From is the expression we're converting from, |
| 1806 | /// and ToType is the type that we're eventually trying to convert to |
| 1807 | /// (which may or may not be the same type as the type that the |
| 1808 | /// conversion function produces). |
| 1809 | void |
| 1810 | Sema::AddConversionCandidate(CXXConversionDecl *Conversion, |
| 1811 | Expr *From, QualType ToType, |
| 1812 | OverloadCandidateSet& CandidateSet) { |
| 1813 | // Add this candidate |
| 1814 | CandidateSet.push_back(OverloadCandidate()); |
| 1815 | OverloadCandidate& Candidate = CandidateSet.back(); |
| 1816 | Candidate.Function = Conversion; |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 1817 | Candidate.IsSurrogate = false; |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1818 | Candidate.FinalConversion.setAsIdentityConversion(); |
| 1819 | Candidate.FinalConversion.FromTypePtr |
| 1820 | = Conversion->getConversionType().getAsOpaquePtr(); |
| 1821 | Candidate.FinalConversion.ToTypePtr = ToType.getAsOpaquePtr(); |
| 1822 | |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1823 | // Determine the implicit conversion sequence for the implicit |
| 1824 | // object parameter. |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1825 | Candidate.Viable = true; |
| 1826 | Candidate.Conversions.resize(1); |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1827 | Candidate.Conversions[0] = TryObjectArgumentInitialization(From, Conversion); |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1828 | |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1829 | if (Candidate.Conversions[0].ConversionKind |
| 1830 | == ImplicitConversionSequence::BadConversion) { |
| 1831 | Candidate.Viable = false; |
| 1832 | return; |
| 1833 | } |
| 1834 | |
| 1835 | // To determine what the conversion from the result of calling the |
| 1836 | // conversion function to the type we're eventually trying to |
| 1837 | // convert to (ToType), we need to synthesize a call to the |
| 1838 | // conversion function and attempt copy initialization from it. This |
| 1839 | // makes sure that we get the right semantics with respect to |
| 1840 | // lvalues/rvalues and the type. Fortunately, we can allocate this |
| 1841 | // call on the stack and we don't need its arguments to be |
| 1842 | // well-formed. |
| 1843 | DeclRefExpr ConversionRef(Conversion, Conversion->getType(), |
| 1844 | SourceLocation()); |
| 1845 | ImplicitCastExpr ConversionFn(Context.getPointerType(Conversion->getType()), |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 1846 | &ConversionRef, false); |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 1847 | CallExpr Call(&ConversionFn, 0, 0, |
| 1848 | Conversion->getConversionType().getNonReferenceType(), |
| 1849 | SourceLocation()); |
| 1850 | ImplicitConversionSequence ICS = TryCopyInitialization(&Call, ToType, true); |
| 1851 | switch (ICS.ConversionKind) { |
| 1852 | case ImplicitConversionSequence::StandardConversion: |
| 1853 | Candidate.FinalConversion = ICS.Standard; |
| 1854 | break; |
| 1855 | |
| 1856 | case ImplicitConversionSequence::BadConversion: |
| 1857 | Candidate.Viable = false; |
| 1858 | break; |
| 1859 | |
| 1860 | default: |
| 1861 | assert(false && |
| 1862 | "Can only end up with a standard conversion sequence or failure"); |
| 1863 | } |
| 1864 | } |
| 1865 | |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 1866 | /// AddSurrogateCandidate - Adds a "surrogate" candidate function that |
| 1867 | /// converts the given @c Object to a function pointer via the |
| 1868 | /// conversion function @c Conversion, and then attempts to call it |
| 1869 | /// with the given arguments (C++ [over.call.object]p2-4). Proto is |
| 1870 | /// the type of function that we'll eventually be calling. |
| 1871 | void Sema::AddSurrogateCandidate(CXXConversionDecl *Conversion, |
| 1872 | const FunctionTypeProto *Proto, |
| 1873 | Expr *Object, Expr **Args, unsigned NumArgs, |
| 1874 | OverloadCandidateSet& CandidateSet) { |
| 1875 | CandidateSet.push_back(OverloadCandidate()); |
| 1876 | OverloadCandidate& Candidate = CandidateSet.back(); |
| 1877 | Candidate.Function = 0; |
| 1878 | Candidate.Surrogate = Conversion; |
| 1879 | Candidate.Viable = true; |
| 1880 | Candidate.IsSurrogate = true; |
| 1881 | Candidate.Conversions.resize(NumArgs + 1); |
| 1882 | |
| 1883 | // Determine the implicit conversion sequence for the implicit |
| 1884 | // object parameter. |
| 1885 | ImplicitConversionSequence ObjectInit |
| 1886 | = TryObjectArgumentInitialization(Object, Conversion); |
| 1887 | if (ObjectInit.ConversionKind == ImplicitConversionSequence::BadConversion) { |
| 1888 | Candidate.Viable = false; |
| 1889 | return; |
| 1890 | } |
| 1891 | |
| 1892 | // The first conversion is actually a user-defined conversion whose |
| 1893 | // first conversion is ObjectInit's standard conversion (which is |
| 1894 | // effectively a reference binding). Record it as such. |
| 1895 | Candidate.Conversions[0].ConversionKind |
| 1896 | = ImplicitConversionSequence::UserDefinedConversion; |
| 1897 | Candidate.Conversions[0].UserDefined.Before = ObjectInit.Standard; |
| 1898 | Candidate.Conversions[0].UserDefined.ConversionFunction = Conversion; |
| 1899 | Candidate.Conversions[0].UserDefined.After |
| 1900 | = Candidate.Conversions[0].UserDefined.Before; |
| 1901 | Candidate.Conversions[0].UserDefined.After.setAsIdentityConversion(); |
| 1902 | |
| 1903 | // Find the |
| 1904 | unsigned NumArgsInProto = Proto->getNumArgs(); |
| 1905 | |
| 1906 | // (C++ 13.3.2p2): A candidate function having fewer than m |
| 1907 | // parameters is viable only if it has an ellipsis in its parameter |
| 1908 | // list (8.3.5). |
| 1909 | if (NumArgs > NumArgsInProto && !Proto->isVariadic()) { |
| 1910 | Candidate.Viable = false; |
| 1911 | return; |
| 1912 | } |
| 1913 | |
| 1914 | // Function types don't have any default arguments, so just check if |
| 1915 | // we have enough arguments. |
| 1916 | if (NumArgs < NumArgsInProto) { |
| 1917 | // Not enough arguments. |
| 1918 | Candidate.Viable = false; |
| 1919 | return; |
| 1920 | } |
| 1921 | |
| 1922 | // Determine the implicit conversion sequences for each of the |
| 1923 | // arguments. |
| 1924 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { |
| 1925 | if (ArgIdx < NumArgsInProto) { |
| 1926 | // (C++ 13.3.2p3): for F to be a viable function, there shall |
| 1927 | // exist for each argument an implicit conversion sequence |
| 1928 | // (13.3.3.1) that converts that argument to the corresponding |
| 1929 | // parameter of F. |
| 1930 | QualType ParamType = Proto->getArgType(ArgIdx); |
| 1931 | Candidate.Conversions[ArgIdx + 1] |
| 1932 | = TryCopyInitialization(Args[ArgIdx], ParamType, |
| 1933 | /*SuppressUserConversions=*/false); |
| 1934 | if (Candidate.Conversions[ArgIdx + 1].ConversionKind |
| 1935 | == ImplicitConversionSequence::BadConversion) { |
| 1936 | Candidate.Viable = false; |
| 1937 | break; |
| 1938 | } |
| 1939 | } else { |
| 1940 | // (C++ 13.3.2p2): For the purposes of overload resolution, any |
| 1941 | // argument for which there is no corresponding parameter is |
| 1942 | // considered to ""match the ellipsis" (C+ 13.3.3.1.3). |
| 1943 | Candidate.Conversions[ArgIdx + 1].ConversionKind |
| 1944 | = ImplicitConversionSequence::EllipsisConversion; |
| 1945 | } |
| 1946 | } |
| 1947 | } |
| 1948 | |
Douglas Gregor | 447b69e | 2008-11-19 03:25:36 +0000 | [diff] [blame] | 1949 | /// IsAcceptableNonMemberOperatorCandidate - Determine whether Fn is |
| 1950 | /// an acceptable non-member overloaded operator for a call whose |
| 1951 | /// arguments have types T1 (and, if non-empty, T2). This routine |
| 1952 | /// implements the check in C++ [over.match.oper]p3b2 concerning |
| 1953 | /// enumeration types. |
| 1954 | static bool |
| 1955 | IsAcceptableNonMemberOperatorCandidate(FunctionDecl *Fn, |
| 1956 | QualType T1, QualType T2, |
| 1957 | ASTContext &Context) { |
| 1958 | if (T1->isRecordType() || (!T2.isNull() && T2->isRecordType())) |
| 1959 | return true; |
| 1960 | |
| 1961 | const FunctionTypeProto *Proto = Fn->getType()->getAsFunctionTypeProto(); |
| 1962 | if (Proto->getNumArgs() < 1) |
| 1963 | return false; |
| 1964 | |
| 1965 | if (T1->isEnumeralType()) { |
| 1966 | QualType ArgType = Proto->getArgType(0).getNonReferenceType(); |
| 1967 | if (Context.getCanonicalType(T1).getUnqualifiedType() |
| 1968 | == Context.getCanonicalType(ArgType).getUnqualifiedType()) |
| 1969 | return true; |
| 1970 | } |
| 1971 | |
| 1972 | if (Proto->getNumArgs() < 2) |
| 1973 | return false; |
| 1974 | |
| 1975 | if (!T2.isNull() && T2->isEnumeralType()) { |
| 1976 | QualType ArgType = Proto->getArgType(1).getNonReferenceType(); |
| 1977 | if (Context.getCanonicalType(T2).getUnqualifiedType() |
| 1978 | == Context.getCanonicalType(ArgType).getUnqualifiedType()) |
| 1979 | return true; |
| 1980 | } |
| 1981 | |
| 1982 | return false; |
| 1983 | } |
| 1984 | |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 1985 | /// AddOperatorCandidates - Add the overloaded operator candidates for |
| 1986 | /// the operator Op that was used in an operator expression such as "x |
| 1987 | /// Op y". S is the scope in which the expression occurred (used for |
| 1988 | /// name lookup of the operator), Args/NumArgs provides the operator |
| 1989 | /// arguments, and CandidateSet will store the added overload |
| 1990 | /// candidates. (C++ [over.match.oper]). |
| 1991 | void Sema::AddOperatorCandidates(OverloadedOperatorKind Op, Scope *S, |
| 1992 | Expr **Args, unsigned NumArgs, |
| 1993 | OverloadCandidateSet& CandidateSet) { |
| 1994 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); |
| 1995 | |
| 1996 | // C++ [over.match.oper]p3: |
| 1997 | // For a unary operator @ with an operand of a type whose |
| 1998 | // cv-unqualified version is T1, and for a binary operator @ with |
| 1999 | // a left operand of a type whose cv-unqualified version is T1 and |
| 2000 | // a right operand of a type whose cv-unqualified version is T2, |
| 2001 | // three sets of candidate functions, designated member |
| 2002 | // candidates, non-member candidates and built-in candidates, are |
| 2003 | // constructed as follows: |
| 2004 | QualType T1 = Args[0]->getType(); |
| 2005 | QualType T2; |
| 2006 | if (NumArgs > 1) |
| 2007 | T2 = Args[1]->getType(); |
| 2008 | |
| 2009 | // -- If T1 is a class type, the set of member candidates is the |
| 2010 | // result of the qualified lookup of T1::operator@ |
| 2011 | // (13.3.1.1.1); otherwise, the set of member candidates is |
| 2012 | // empty. |
| 2013 | if (const RecordType *T1Rec = T1->getAsRecordType()) { |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 2014 | DeclContext::lookup_const_result Lookup |
Douglas Gregor | e267ff3 | 2008-12-11 20:41:00 +0000 | [diff] [blame] | 2015 | = T1Rec->getDecl()->lookup(Context, OpName); |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 2016 | NamedDecl *MemberOps = (Lookup.first == Lookup.second)? 0 : *Lookup.first; |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 2017 | if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(MemberOps)) |
| 2018 | AddMethodCandidate(Method, Args[0], Args+1, NumArgs - 1, CandidateSet, |
| 2019 | /*SuppressUserConversions=*/false); |
| 2020 | else if (OverloadedFunctionDecl *Ovl |
| 2021 | = dyn_cast_or_null<OverloadedFunctionDecl>(MemberOps)) { |
| 2022 | for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), |
| 2023 | FEnd = Ovl->function_end(); |
| 2024 | F != FEnd; ++F) { |
| 2025 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*F)) |
| 2026 | AddMethodCandidate(Method, Args[0], Args+1, NumArgs - 1, CandidateSet, |
| 2027 | /*SuppressUserConversions=*/false); |
| 2028 | } |
| 2029 | } |
| 2030 | } |
| 2031 | |
| 2032 | // -- The set of non-member candidates is the result of the |
| 2033 | // unqualified lookup of operator@ in the context of the |
| 2034 | // expression according to the usual rules for name lookup in |
| 2035 | // unqualified function calls (3.4.2) except that all member |
| 2036 | // functions are ignored. However, if no operand has a class |
| 2037 | // type, only those non-member functions in the lookup set |
| 2038 | // that have a first parameter of type T1 or “reference to |
| 2039 | // (possibly cv-qualified) T1”, when T1 is an enumeration |
| 2040 | // type, or (if there is a right operand) a second parameter |
| 2041 | // of type T2 or “reference to (possibly cv-qualified) T2”, |
| 2042 | // when T2 is an enumeration type, are candidate functions. |
| 2043 | { |
| 2044 | NamedDecl *NonMemberOps = 0; |
| 2045 | for (IdentifierResolver::iterator I |
| 2046 | = IdResolver.begin(OpName, CurContext, true/*LookInParentCtx*/); |
| 2047 | I != IdResolver.end(); ++I) { |
| 2048 | // We don't need to check the identifier namespace, because |
| 2049 | // operator names can only be ordinary identifiers. |
| 2050 | |
| 2051 | // Ignore member functions. |
| 2052 | if (ScopedDecl *SD = dyn_cast<ScopedDecl>(*I)) { |
| 2053 | if (SD->getDeclContext()->isCXXRecord()) |
| 2054 | continue; |
| 2055 | } |
| 2056 | |
| 2057 | // We found something with this name. We're done. |
| 2058 | NonMemberOps = *I; |
| 2059 | break; |
| 2060 | } |
| 2061 | |
Douglas Gregor | 447b69e | 2008-11-19 03:25:36 +0000 | [diff] [blame] | 2062 | if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(NonMemberOps)) { |
| 2063 | if (IsAcceptableNonMemberOperatorCandidate(FD, T1, T2, Context)) |
| 2064 | AddOverloadCandidate(FD, Args, NumArgs, CandidateSet, |
| 2065 | /*SuppressUserConversions=*/false); |
| 2066 | } else if (OverloadedFunctionDecl *Ovl |
| 2067 | = dyn_cast_or_null<OverloadedFunctionDecl>(NonMemberOps)) { |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 2068 | for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), |
| 2069 | FEnd = Ovl->function_end(); |
Douglas Gregor | 447b69e | 2008-11-19 03:25:36 +0000 | [diff] [blame] | 2070 | F != FEnd; ++F) { |
| 2071 | if (IsAcceptableNonMemberOperatorCandidate(*F, T1, T2, Context)) |
| 2072 | AddOverloadCandidate(*F, Args, NumArgs, CandidateSet, |
| 2073 | /*SuppressUserConversions=*/false); |
| 2074 | } |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 2075 | } |
| 2076 | } |
| 2077 | |
| 2078 | // Add builtin overload candidates (C++ [over.built]). |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2079 | AddBuiltinOperatorCandidates(Op, Args, NumArgs, CandidateSet); |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 2080 | } |
| 2081 | |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2082 | /// AddBuiltinCandidate - Add a candidate for a built-in |
| 2083 | /// operator. ResultTy and ParamTys are the result and parameter types |
| 2084 | /// of the built-in candidate, respectively. Args and NumArgs are the |
| 2085 | /// arguments being passed to the candidate. |
| 2086 | void Sema::AddBuiltinCandidate(QualType ResultTy, QualType *ParamTys, |
| 2087 | Expr **Args, unsigned NumArgs, |
| 2088 | OverloadCandidateSet& CandidateSet) { |
| 2089 | // Add this candidate |
| 2090 | CandidateSet.push_back(OverloadCandidate()); |
| 2091 | OverloadCandidate& Candidate = CandidateSet.back(); |
| 2092 | Candidate.Function = 0; |
Douglas Gregor | c9467cf | 2008-12-12 02:00:36 +0000 | [diff] [blame] | 2093 | Candidate.IsSurrogate = false; |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2094 | Candidate.BuiltinTypes.ResultTy = ResultTy; |
| 2095 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) |
| 2096 | Candidate.BuiltinTypes.ParamTypes[ArgIdx] = ParamTys[ArgIdx]; |
| 2097 | |
| 2098 | // Determine the implicit conversion sequences for each of the |
| 2099 | // arguments. |
| 2100 | Candidate.Viable = true; |
| 2101 | Candidate.Conversions.resize(NumArgs); |
| 2102 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { |
| 2103 | Candidate.Conversions[ArgIdx] |
| 2104 | = TryCopyInitialization(Args[ArgIdx], ParamTys[ArgIdx], false); |
| 2105 | if (Candidate.Conversions[ArgIdx].ConversionKind |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 2106 | == ImplicitConversionSequence::BadConversion) { |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2107 | Candidate.Viable = false; |
Douglas Gregor | 96176b3 | 2008-11-18 23:14:02 +0000 | [diff] [blame] | 2108 | break; |
| 2109 | } |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2110 | } |
| 2111 | } |
| 2112 | |
| 2113 | /// BuiltinCandidateTypeSet - A set of types that will be used for the |
| 2114 | /// candidate operator functions for built-in operators (C++ |
| 2115 | /// [over.built]). The types are separated into pointer types and |
| 2116 | /// enumeration types. |
| 2117 | class BuiltinCandidateTypeSet { |
| 2118 | /// TypeSet - A set of types. |
Douglas Gregor | bf3af05 | 2008-11-13 20:12:29 +0000 | [diff] [blame] | 2119 | typedef llvm::SmallPtrSet<void*, 8> TypeSet; |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2120 | |
| 2121 | /// PointerTypes - The set of pointer types that will be used in the |
| 2122 | /// built-in candidates. |
| 2123 | TypeSet PointerTypes; |
| 2124 | |
| 2125 | /// EnumerationTypes - The set of enumeration types that will be |
| 2126 | /// used in the built-in candidates. |
| 2127 | TypeSet EnumerationTypes; |
| 2128 | |
| 2129 | /// Context - The AST context in which we will build the type sets. |
| 2130 | ASTContext &Context; |
| 2131 | |
| 2132 | bool AddWithMoreQualifiedTypeVariants(QualType Ty); |
| 2133 | |
| 2134 | public: |
| 2135 | /// iterator - Iterates through the types that are part of the set. |
Douglas Gregor | bf3af05 | 2008-11-13 20:12:29 +0000 | [diff] [blame] | 2136 | class iterator { |
| 2137 | TypeSet::iterator Base; |
| 2138 | |
| 2139 | public: |
| 2140 | typedef QualType value_type; |
| 2141 | typedef QualType reference; |
| 2142 | typedef QualType pointer; |
| 2143 | typedef std::ptrdiff_t difference_type; |
| 2144 | typedef std::input_iterator_tag iterator_category; |
| 2145 | |
| 2146 | iterator(TypeSet::iterator B) : Base(B) { } |
| 2147 | |
| 2148 | iterator& operator++() { |
| 2149 | ++Base; |
| 2150 | return *this; |
| 2151 | } |
| 2152 | |
| 2153 | iterator operator++(int) { |
| 2154 | iterator tmp(*this); |
| 2155 | ++(*this); |
| 2156 | return tmp; |
| 2157 | } |
| 2158 | |
| 2159 | reference operator*() const { |
| 2160 | return QualType::getFromOpaquePtr(*Base); |
| 2161 | } |
| 2162 | |
| 2163 | pointer operator->() const { |
| 2164 | return **this; |
| 2165 | } |
| 2166 | |
| 2167 | friend bool operator==(iterator LHS, iterator RHS) { |
| 2168 | return LHS.Base == RHS.Base; |
| 2169 | } |
| 2170 | |
| 2171 | friend bool operator!=(iterator LHS, iterator RHS) { |
| 2172 | return LHS.Base != RHS.Base; |
| 2173 | } |
| 2174 | }; |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2175 | |
| 2176 | BuiltinCandidateTypeSet(ASTContext &Context) : Context(Context) { } |
| 2177 | |
| 2178 | void AddTypesConvertedFrom(QualType Ty, bool AllowUserConversions = true); |
| 2179 | |
| 2180 | /// pointer_begin - First pointer type found; |
| 2181 | iterator pointer_begin() { return PointerTypes.begin(); } |
| 2182 | |
| 2183 | /// pointer_end - Last pointer type found; |
| 2184 | iterator pointer_end() { return PointerTypes.end(); } |
| 2185 | |
| 2186 | /// enumeration_begin - First enumeration type found; |
| 2187 | iterator enumeration_begin() { return EnumerationTypes.begin(); } |
| 2188 | |
| 2189 | /// enumeration_end - Last enumeration type found; |
| 2190 | iterator enumeration_end() { return EnumerationTypes.end(); } |
| 2191 | }; |
| 2192 | |
| 2193 | /// AddWithMoreQualifiedTypeVariants - Add the pointer type @p Ty to |
| 2194 | /// the set of pointer types along with any more-qualified variants of |
| 2195 | /// that type. For example, if @p Ty is "int const *", this routine |
| 2196 | /// will add "int const *", "int const volatile *", "int const |
| 2197 | /// restrict *", and "int const volatile restrict *" to the set of |
| 2198 | /// pointer types. Returns true if the add of @p Ty itself succeeded, |
| 2199 | /// false otherwise. |
| 2200 | bool BuiltinCandidateTypeSet::AddWithMoreQualifiedTypeVariants(QualType Ty) { |
| 2201 | // Insert this type. |
Douglas Gregor | bf3af05 | 2008-11-13 20:12:29 +0000 | [diff] [blame] | 2202 | if (!PointerTypes.insert(Ty.getAsOpaquePtr())) |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2203 | return false; |
| 2204 | |
| 2205 | if (const PointerType *PointerTy = Ty->getAsPointerType()) { |
| 2206 | QualType PointeeTy = PointerTy->getPointeeType(); |
| 2207 | // FIXME: Optimize this so that we don't keep trying to add the same types. |
| 2208 | |
| 2209 | // FIXME: Do we have to add CVR qualifiers at *all* levels to deal |
| 2210 | // with all pointer conversions that don't cast away constness? |
| 2211 | if (!PointeeTy.isConstQualified()) |
| 2212 | AddWithMoreQualifiedTypeVariants |
| 2213 | (Context.getPointerType(PointeeTy.withConst())); |
| 2214 | if (!PointeeTy.isVolatileQualified()) |
| 2215 | AddWithMoreQualifiedTypeVariants |
| 2216 | (Context.getPointerType(PointeeTy.withVolatile())); |
| 2217 | if (!PointeeTy.isRestrictQualified()) |
| 2218 | AddWithMoreQualifiedTypeVariants |
| 2219 | (Context.getPointerType(PointeeTy.withRestrict())); |
| 2220 | } |
| 2221 | |
| 2222 | return true; |
| 2223 | } |
| 2224 | |
| 2225 | /// AddTypesConvertedFrom - Add each of the types to which the type @p |
| 2226 | /// Ty can be implicit converted to the given set of @p Types. We're |
| 2227 | /// primarily interested in pointer types, enumeration types, |
| 2228 | void BuiltinCandidateTypeSet::AddTypesConvertedFrom(QualType Ty, |
| 2229 | bool AllowUserConversions) { |
| 2230 | // Only deal with canonical types. |
| 2231 | Ty = Context.getCanonicalType(Ty); |
| 2232 | |
| 2233 | // Look through reference types; they aren't part of the type of an |
| 2234 | // expression for the purposes of conversions. |
| 2235 | if (const ReferenceType *RefTy = Ty->getAsReferenceType()) |
| 2236 | Ty = RefTy->getPointeeType(); |
| 2237 | |
| 2238 | // We don't care about qualifiers on the type. |
| 2239 | Ty = Ty.getUnqualifiedType(); |
| 2240 | |
| 2241 | if (const PointerType *PointerTy = Ty->getAsPointerType()) { |
| 2242 | QualType PointeeTy = PointerTy->getPointeeType(); |
| 2243 | |
| 2244 | // Insert our type, and its more-qualified variants, into the set |
| 2245 | // of types. |
| 2246 | if (!AddWithMoreQualifiedTypeVariants(Ty)) |
| 2247 | return; |
| 2248 | |
| 2249 | // Add 'cv void*' to our set of types. |
| 2250 | if (!Ty->isVoidType()) { |
| 2251 | QualType QualVoid |
| 2252 | = Context.VoidTy.getQualifiedType(PointeeTy.getCVRQualifiers()); |
| 2253 | AddWithMoreQualifiedTypeVariants(Context.getPointerType(QualVoid)); |
| 2254 | } |
| 2255 | |
| 2256 | // If this is a pointer to a class type, add pointers to its bases |
| 2257 | // (with the same level of cv-qualification as the original |
| 2258 | // derived class, of course). |
| 2259 | if (const RecordType *PointeeRec = PointeeTy->getAsRecordType()) { |
| 2260 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(PointeeRec->getDecl()); |
| 2261 | for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); |
| 2262 | Base != ClassDecl->bases_end(); ++Base) { |
| 2263 | QualType BaseTy = Context.getCanonicalType(Base->getType()); |
| 2264 | BaseTy = BaseTy.getQualifiedType(PointeeTy.getCVRQualifiers()); |
| 2265 | |
| 2266 | // Add the pointer type, recursively, so that we get all of |
| 2267 | // the indirect base classes, too. |
| 2268 | AddTypesConvertedFrom(Context.getPointerType(BaseTy), false); |
| 2269 | } |
| 2270 | } |
| 2271 | } else if (Ty->isEnumeralType()) { |
Douglas Gregor | bf3af05 | 2008-11-13 20:12:29 +0000 | [diff] [blame] | 2272 | EnumerationTypes.insert(Ty.getAsOpaquePtr()); |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2273 | } else if (AllowUserConversions) { |
| 2274 | if (const RecordType *TyRec = Ty->getAsRecordType()) { |
| 2275 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(TyRec->getDecl()); |
| 2276 | // FIXME: Visit conversion functions in the base classes, too. |
| 2277 | OverloadedFunctionDecl *Conversions |
| 2278 | = ClassDecl->getConversionFunctions(); |
| 2279 | for (OverloadedFunctionDecl::function_iterator Func |
| 2280 | = Conversions->function_begin(); |
| 2281 | Func != Conversions->function_end(); ++Func) { |
| 2282 | CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); |
| 2283 | AddTypesConvertedFrom(Conv->getConversionType(), false); |
| 2284 | } |
| 2285 | } |
| 2286 | } |
| 2287 | } |
| 2288 | |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2289 | /// AddBuiltinOperatorCandidates - Add the appropriate built-in |
| 2290 | /// operator overloads to the candidate set (C++ [over.built]), based |
| 2291 | /// on the operator @p Op and the arguments given. For example, if the |
| 2292 | /// operator is a binary '+', this routine might add "int |
| 2293 | /// operator+(int, int)" to cover integer addition. |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2294 | void |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2295 | Sema::AddBuiltinOperatorCandidates(OverloadedOperatorKind Op, |
| 2296 | Expr **Args, unsigned NumArgs, |
| 2297 | OverloadCandidateSet& CandidateSet) { |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2298 | // The set of "promoted arithmetic types", which are the arithmetic |
| 2299 | // types are that preserved by promotion (C++ [over.built]p2). Note |
| 2300 | // that the first few of these types are the promoted integral |
| 2301 | // types; these types need to be first. |
| 2302 | // FIXME: What about complex? |
| 2303 | const unsigned FirstIntegralType = 0; |
| 2304 | const unsigned LastIntegralType = 13; |
| 2305 | const unsigned FirstPromotedIntegralType = 7, |
| 2306 | LastPromotedIntegralType = 13; |
| 2307 | const unsigned FirstPromotedArithmeticType = 7, |
| 2308 | LastPromotedArithmeticType = 16; |
| 2309 | const unsigned NumArithmeticTypes = 16; |
| 2310 | QualType ArithmeticTypes[NumArithmeticTypes] = { |
| 2311 | Context.BoolTy, Context.CharTy, Context.WCharTy, |
| 2312 | Context.SignedCharTy, Context.ShortTy, |
| 2313 | Context.UnsignedCharTy, Context.UnsignedShortTy, |
| 2314 | Context.IntTy, Context.LongTy, Context.LongLongTy, |
| 2315 | Context.UnsignedIntTy, Context.UnsignedLongTy, Context.UnsignedLongLongTy, |
| 2316 | Context.FloatTy, Context.DoubleTy, Context.LongDoubleTy |
| 2317 | }; |
| 2318 | |
| 2319 | // Find all of the types that the arguments can convert to, but only |
| 2320 | // if the operator we're looking at has built-in operator candidates |
| 2321 | // that make use of these types. |
| 2322 | BuiltinCandidateTypeSet CandidateTypes(Context); |
| 2323 | if (Op == OO_Less || Op == OO_Greater || Op == OO_LessEqual || |
| 2324 | Op == OO_GreaterEqual || Op == OO_EqualEqual || Op == OO_ExclaimEqual || |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2325 | Op == OO_Plus || (Op == OO_Minus && NumArgs == 2) || Op == OO_Equal || |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2326 | Op == OO_PlusEqual || Op == OO_MinusEqual || Op == OO_Subscript || |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2327 | Op == OO_ArrowStar || Op == OO_PlusPlus || Op == OO_MinusMinus || |
| 2328 | (Op == OO_Star && NumArgs == 1)) { |
| 2329 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2330 | CandidateTypes.AddTypesConvertedFrom(Args[ArgIdx]->getType()); |
| 2331 | } |
| 2332 | |
| 2333 | bool isComparison = false; |
| 2334 | switch (Op) { |
| 2335 | case OO_None: |
| 2336 | case NUM_OVERLOADED_OPERATORS: |
| 2337 | assert(false && "Expected an overloaded operator"); |
| 2338 | break; |
| 2339 | |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2340 | case OO_Star: // '*' is either unary or binary |
| 2341 | if (NumArgs == 1) |
| 2342 | goto UnaryStar; |
| 2343 | else |
| 2344 | goto BinaryStar; |
| 2345 | break; |
| 2346 | |
| 2347 | case OO_Plus: // '+' is either unary or binary |
| 2348 | if (NumArgs == 1) |
| 2349 | goto UnaryPlus; |
| 2350 | else |
| 2351 | goto BinaryPlus; |
| 2352 | break; |
| 2353 | |
| 2354 | case OO_Minus: // '-' is either unary or binary |
| 2355 | if (NumArgs == 1) |
| 2356 | goto UnaryMinus; |
| 2357 | else |
| 2358 | goto BinaryMinus; |
| 2359 | break; |
| 2360 | |
| 2361 | case OO_Amp: // '&' is either unary or binary |
| 2362 | if (NumArgs == 1) |
| 2363 | goto UnaryAmp; |
| 2364 | else |
| 2365 | goto BinaryAmp; |
| 2366 | |
| 2367 | case OO_PlusPlus: |
| 2368 | case OO_MinusMinus: |
| 2369 | // C++ [over.built]p3: |
| 2370 | // |
| 2371 | // For every pair (T, VQ), where T is an arithmetic type, and VQ |
| 2372 | // is either volatile or empty, there exist candidate operator |
| 2373 | // functions of the form |
| 2374 | // |
| 2375 | // VQ T& operator++(VQ T&); |
| 2376 | // T operator++(VQ T&, int); |
| 2377 | // |
| 2378 | // C++ [over.built]p4: |
| 2379 | // |
| 2380 | // For every pair (T, VQ), where T is an arithmetic type other |
| 2381 | // than bool, and VQ is either volatile or empty, there exist |
| 2382 | // candidate operator functions of the form |
| 2383 | // |
| 2384 | // VQ T& operator--(VQ T&); |
| 2385 | // T operator--(VQ T&, int); |
| 2386 | for (unsigned Arith = (Op == OO_PlusPlus? 0 : 1); |
| 2387 | Arith < NumArithmeticTypes; ++Arith) { |
| 2388 | QualType ArithTy = ArithmeticTypes[Arith]; |
| 2389 | QualType ParamTypes[2] |
| 2390 | = { Context.getReferenceType(ArithTy), Context.IntTy }; |
| 2391 | |
| 2392 | // Non-volatile version. |
| 2393 | if (NumArgs == 1) |
| 2394 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); |
| 2395 | else |
| 2396 | AddBuiltinCandidate(ArithTy, ParamTypes, Args, 2, CandidateSet); |
| 2397 | |
| 2398 | // Volatile version |
| 2399 | ParamTypes[0] = Context.getReferenceType(ArithTy.withVolatile()); |
| 2400 | if (NumArgs == 1) |
| 2401 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); |
| 2402 | else |
| 2403 | AddBuiltinCandidate(ArithTy, ParamTypes, Args, 2, CandidateSet); |
| 2404 | } |
| 2405 | |
| 2406 | // C++ [over.built]p5: |
| 2407 | // |
| 2408 | // For every pair (T, VQ), where T is a cv-qualified or |
| 2409 | // cv-unqualified object type, and VQ is either volatile or |
| 2410 | // empty, there exist candidate operator functions of the form |
| 2411 | // |
| 2412 | // T*VQ& operator++(T*VQ&); |
| 2413 | // T*VQ& operator--(T*VQ&); |
| 2414 | // T* operator++(T*VQ&, int); |
| 2415 | // T* operator--(T*VQ&, int); |
| 2416 | for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); |
| 2417 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2418 | // Skip pointer types that aren't pointers to object types. |
Douglas Gregor | cb7de52 | 2008-11-26 23:31:11 +0000 | [diff] [blame] | 2419 | if (!(*Ptr)->getAsPointerType()->getPointeeType()->isIncompleteOrObjectType()) |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2420 | continue; |
| 2421 | |
| 2422 | QualType ParamTypes[2] = { |
| 2423 | Context.getReferenceType(*Ptr), Context.IntTy |
| 2424 | }; |
| 2425 | |
| 2426 | // Without volatile |
| 2427 | if (NumArgs == 1) |
| 2428 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); |
| 2429 | else |
| 2430 | AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); |
| 2431 | |
| 2432 | if (!Context.getCanonicalType(*Ptr).isVolatileQualified()) { |
| 2433 | // With volatile |
| 2434 | ParamTypes[0] = Context.getReferenceType((*Ptr).withVolatile()); |
| 2435 | if (NumArgs == 1) |
| 2436 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); |
| 2437 | else |
| 2438 | AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); |
| 2439 | } |
| 2440 | } |
| 2441 | break; |
| 2442 | |
| 2443 | UnaryStar: |
| 2444 | // C++ [over.built]p6: |
| 2445 | // For every cv-qualified or cv-unqualified object type T, there |
| 2446 | // exist candidate operator functions of the form |
| 2447 | // |
| 2448 | // T& operator*(T*); |
| 2449 | // |
| 2450 | // C++ [over.built]p7: |
| 2451 | // For every function type T, there exist candidate operator |
| 2452 | // functions of the form |
| 2453 | // T& operator*(T*); |
| 2454 | for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); |
| 2455 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2456 | QualType ParamTy = *Ptr; |
| 2457 | QualType PointeeTy = ParamTy->getAsPointerType()->getPointeeType(); |
| 2458 | AddBuiltinCandidate(Context.getReferenceType(PointeeTy), |
| 2459 | &ParamTy, Args, 1, CandidateSet); |
| 2460 | } |
| 2461 | break; |
| 2462 | |
| 2463 | UnaryPlus: |
| 2464 | // C++ [over.built]p8: |
| 2465 | // For every type T, there exist candidate operator functions of |
| 2466 | // the form |
| 2467 | // |
| 2468 | // T* operator+(T*); |
| 2469 | for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); |
| 2470 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2471 | QualType ParamTy = *Ptr; |
| 2472 | AddBuiltinCandidate(ParamTy, &ParamTy, Args, 1, CandidateSet); |
| 2473 | } |
| 2474 | |
| 2475 | // Fall through |
| 2476 | |
| 2477 | UnaryMinus: |
| 2478 | // C++ [over.built]p9: |
| 2479 | // For every promoted arithmetic type T, there exist candidate |
| 2480 | // operator functions of the form |
| 2481 | // |
| 2482 | // T operator+(T); |
| 2483 | // T operator-(T); |
| 2484 | for (unsigned Arith = FirstPromotedArithmeticType; |
| 2485 | Arith < LastPromotedArithmeticType; ++Arith) { |
| 2486 | QualType ArithTy = ArithmeticTypes[Arith]; |
| 2487 | AddBuiltinCandidate(ArithTy, &ArithTy, Args, 1, CandidateSet); |
| 2488 | } |
| 2489 | break; |
| 2490 | |
| 2491 | case OO_Tilde: |
| 2492 | // C++ [over.built]p10: |
| 2493 | // For every promoted integral type T, there exist candidate |
| 2494 | // operator functions of the form |
| 2495 | // |
| 2496 | // T operator~(T); |
| 2497 | for (unsigned Int = FirstPromotedIntegralType; |
| 2498 | Int < LastPromotedIntegralType; ++Int) { |
| 2499 | QualType IntTy = ArithmeticTypes[Int]; |
| 2500 | AddBuiltinCandidate(IntTy, &IntTy, Args, 1, CandidateSet); |
| 2501 | } |
| 2502 | break; |
| 2503 | |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2504 | case OO_New: |
| 2505 | case OO_Delete: |
| 2506 | case OO_Array_New: |
| 2507 | case OO_Array_Delete: |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2508 | case OO_Call: |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2509 | assert(false && "Special operators don't use AddBuiltinOperatorCandidates"); |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2510 | break; |
| 2511 | |
| 2512 | case OO_Comma: |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2513 | UnaryAmp: |
| 2514 | case OO_Arrow: |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2515 | // C++ [over.match.oper]p3: |
| 2516 | // -- For the operator ',', the unary operator '&', or the |
| 2517 | // operator '->', the built-in candidates set is empty. |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2518 | break; |
| 2519 | |
| 2520 | case OO_Less: |
| 2521 | case OO_Greater: |
| 2522 | case OO_LessEqual: |
| 2523 | case OO_GreaterEqual: |
| 2524 | case OO_EqualEqual: |
| 2525 | case OO_ExclaimEqual: |
| 2526 | // C++ [over.built]p15: |
| 2527 | // |
| 2528 | // For every pointer or enumeration type T, there exist |
| 2529 | // candidate operator functions of the form |
| 2530 | // |
| 2531 | // bool operator<(T, T); |
| 2532 | // bool operator>(T, T); |
| 2533 | // bool operator<=(T, T); |
| 2534 | // bool operator>=(T, T); |
| 2535 | // bool operator==(T, T); |
| 2536 | // bool operator!=(T, T); |
| 2537 | for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); |
| 2538 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2539 | QualType ParamTypes[2] = { *Ptr, *Ptr }; |
| 2540 | AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet); |
| 2541 | } |
| 2542 | for (BuiltinCandidateTypeSet::iterator Enum |
| 2543 | = CandidateTypes.enumeration_begin(); |
| 2544 | Enum != CandidateTypes.enumeration_end(); ++Enum) { |
| 2545 | QualType ParamTypes[2] = { *Enum, *Enum }; |
| 2546 | AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet); |
| 2547 | } |
| 2548 | |
| 2549 | // Fall through. |
| 2550 | isComparison = true; |
| 2551 | |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2552 | BinaryPlus: |
| 2553 | BinaryMinus: |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2554 | if (!isComparison) { |
| 2555 | // We didn't fall through, so we must have OO_Plus or OO_Minus. |
| 2556 | |
| 2557 | // C++ [over.built]p13: |
| 2558 | // |
| 2559 | // For every cv-qualified or cv-unqualified object type T |
| 2560 | // there exist candidate operator functions of the form |
| 2561 | // |
| 2562 | // T* operator+(T*, ptrdiff_t); |
| 2563 | // T& operator[](T*, ptrdiff_t); [BELOW] |
| 2564 | // T* operator-(T*, ptrdiff_t); |
| 2565 | // T* operator+(ptrdiff_t, T*); |
| 2566 | // T& operator[](ptrdiff_t, T*); [BELOW] |
| 2567 | // |
| 2568 | // C++ [over.built]p14: |
| 2569 | // |
| 2570 | // For every T, where T is a pointer to object type, there |
| 2571 | // exist candidate operator functions of the form |
| 2572 | // |
| 2573 | // ptrdiff_t operator-(T, T); |
| 2574 | for (BuiltinCandidateTypeSet::iterator Ptr |
| 2575 | = CandidateTypes.pointer_begin(); |
| 2576 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2577 | QualType ParamTypes[2] = { *Ptr, Context.getPointerDiffType() }; |
| 2578 | |
| 2579 | // operator+(T*, ptrdiff_t) or operator-(T*, ptrdiff_t) |
| 2580 | AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); |
| 2581 | |
| 2582 | if (Op == OO_Plus) { |
| 2583 | // T* operator+(ptrdiff_t, T*); |
| 2584 | ParamTypes[0] = ParamTypes[1]; |
| 2585 | ParamTypes[1] = *Ptr; |
| 2586 | AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); |
| 2587 | } else { |
| 2588 | // ptrdiff_t operator-(T, T); |
| 2589 | ParamTypes[1] = *Ptr; |
| 2590 | AddBuiltinCandidate(Context.getPointerDiffType(), ParamTypes, |
| 2591 | Args, 2, CandidateSet); |
| 2592 | } |
| 2593 | } |
| 2594 | } |
| 2595 | // Fall through |
| 2596 | |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2597 | case OO_Slash: |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2598 | BinaryStar: |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2599 | // C++ [over.built]p12: |
| 2600 | // |
| 2601 | // For every pair of promoted arithmetic types L and R, there |
| 2602 | // exist candidate operator functions of the form |
| 2603 | // |
| 2604 | // LR operator*(L, R); |
| 2605 | // LR operator/(L, R); |
| 2606 | // LR operator+(L, R); |
| 2607 | // LR operator-(L, R); |
| 2608 | // bool operator<(L, R); |
| 2609 | // bool operator>(L, R); |
| 2610 | // bool operator<=(L, R); |
| 2611 | // bool operator>=(L, R); |
| 2612 | // bool operator==(L, R); |
| 2613 | // bool operator!=(L, R); |
| 2614 | // |
| 2615 | // where LR is the result of the usual arithmetic conversions |
| 2616 | // between types L and R. |
| 2617 | for (unsigned Left = FirstPromotedArithmeticType; |
| 2618 | Left < LastPromotedArithmeticType; ++Left) { |
| 2619 | for (unsigned Right = FirstPromotedArithmeticType; |
| 2620 | Right < LastPromotedArithmeticType; ++Right) { |
| 2621 | QualType LandR[2] = { ArithmeticTypes[Left], ArithmeticTypes[Right] }; |
| 2622 | QualType Result |
| 2623 | = isComparison? Context.BoolTy |
| 2624 | : UsualArithmeticConversionsType(LandR[0], LandR[1]); |
| 2625 | AddBuiltinCandidate(Result, LandR, Args, 2, CandidateSet); |
| 2626 | } |
| 2627 | } |
| 2628 | break; |
| 2629 | |
| 2630 | case OO_Percent: |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2631 | BinaryAmp: |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2632 | case OO_Caret: |
| 2633 | case OO_Pipe: |
| 2634 | case OO_LessLess: |
| 2635 | case OO_GreaterGreater: |
| 2636 | // C++ [over.built]p17: |
| 2637 | // |
| 2638 | // For every pair of promoted integral types L and R, there |
| 2639 | // exist candidate operator functions of the form |
| 2640 | // |
| 2641 | // LR operator%(L, R); |
| 2642 | // LR operator&(L, R); |
| 2643 | // LR operator^(L, R); |
| 2644 | // LR operator|(L, R); |
| 2645 | // L operator<<(L, R); |
| 2646 | // L operator>>(L, R); |
| 2647 | // |
| 2648 | // where LR is the result of the usual arithmetic conversions |
| 2649 | // between types L and R. |
| 2650 | for (unsigned Left = FirstPromotedIntegralType; |
| 2651 | Left < LastPromotedIntegralType; ++Left) { |
| 2652 | for (unsigned Right = FirstPromotedIntegralType; |
| 2653 | Right < LastPromotedIntegralType; ++Right) { |
| 2654 | QualType LandR[2] = { ArithmeticTypes[Left], ArithmeticTypes[Right] }; |
| 2655 | QualType Result = (Op == OO_LessLess || Op == OO_GreaterGreater) |
| 2656 | ? LandR[0] |
| 2657 | : UsualArithmeticConversionsType(LandR[0], LandR[1]); |
| 2658 | AddBuiltinCandidate(Result, LandR, Args, 2, CandidateSet); |
| 2659 | } |
| 2660 | } |
| 2661 | break; |
| 2662 | |
| 2663 | case OO_Equal: |
| 2664 | // C++ [over.built]p20: |
| 2665 | // |
| 2666 | // For every pair (T, VQ), where T is an enumeration or |
| 2667 | // (FIXME:) pointer to member type and VQ is either volatile or |
| 2668 | // empty, there exist candidate operator functions of the form |
| 2669 | // |
| 2670 | // VQ T& operator=(VQ T&, T); |
| 2671 | for (BuiltinCandidateTypeSet::iterator Enum |
| 2672 | = CandidateTypes.enumeration_begin(); |
| 2673 | Enum != CandidateTypes.enumeration_end(); ++Enum) { |
| 2674 | QualType ParamTypes[2]; |
| 2675 | |
| 2676 | // T& operator=(T&, T) |
| 2677 | ParamTypes[0] = Context.getReferenceType(*Enum); |
| 2678 | ParamTypes[1] = *Enum; |
| 2679 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2680 | |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2681 | if (!Context.getCanonicalType(*Enum).isVolatileQualified()) { |
| 2682 | // volatile T& operator=(volatile T&, T) |
| 2683 | ParamTypes[0] = Context.getReferenceType((*Enum).withVolatile()); |
| 2684 | ParamTypes[1] = *Enum; |
| 2685 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2686 | } |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2687 | } |
| 2688 | // Fall through. |
| 2689 | |
| 2690 | case OO_PlusEqual: |
| 2691 | case OO_MinusEqual: |
| 2692 | // C++ [over.built]p19: |
| 2693 | // |
| 2694 | // For every pair (T, VQ), where T is any type and VQ is either |
| 2695 | // volatile or empty, there exist candidate operator functions |
| 2696 | // of the form |
| 2697 | // |
| 2698 | // T*VQ& operator=(T*VQ&, T*); |
| 2699 | // |
| 2700 | // C++ [over.built]p21: |
| 2701 | // |
| 2702 | // For every pair (T, VQ), where T is a cv-qualified or |
| 2703 | // cv-unqualified object type and VQ is either volatile or |
| 2704 | // empty, there exist candidate operator functions of the form |
| 2705 | // |
| 2706 | // T*VQ& operator+=(T*VQ&, ptrdiff_t); |
| 2707 | // T*VQ& operator-=(T*VQ&, ptrdiff_t); |
| 2708 | for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); |
| 2709 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2710 | QualType ParamTypes[2]; |
| 2711 | ParamTypes[1] = (Op == OO_Equal)? *Ptr : Context.getPointerDiffType(); |
| 2712 | |
| 2713 | // non-volatile version |
| 2714 | ParamTypes[0] = Context.getReferenceType(*Ptr); |
| 2715 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2716 | |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2717 | if (!Context.getCanonicalType(*Ptr).isVolatileQualified()) { |
| 2718 | // volatile version |
| 2719 | ParamTypes[0] = Context.getReferenceType((*Ptr).withVolatile()); |
| 2720 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2721 | } |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2722 | } |
| 2723 | // Fall through. |
| 2724 | |
| 2725 | case OO_StarEqual: |
| 2726 | case OO_SlashEqual: |
| 2727 | // C++ [over.built]p18: |
| 2728 | // |
| 2729 | // For every triple (L, VQ, R), where L is an arithmetic type, |
| 2730 | // VQ is either volatile or empty, and R is a promoted |
| 2731 | // arithmetic type, there exist candidate operator functions of |
| 2732 | // the form |
| 2733 | // |
| 2734 | // VQ L& operator=(VQ L&, R); |
| 2735 | // VQ L& operator*=(VQ L&, R); |
| 2736 | // VQ L& operator/=(VQ L&, R); |
| 2737 | // VQ L& operator+=(VQ L&, R); |
| 2738 | // VQ L& operator-=(VQ L&, R); |
| 2739 | for (unsigned Left = 0; Left < NumArithmeticTypes; ++Left) { |
| 2740 | for (unsigned Right = FirstPromotedArithmeticType; |
| 2741 | Right < LastPromotedArithmeticType; ++Right) { |
| 2742 | QualType ParamTypes[2]; |
| 2743 | ParamTypes[1] = ArithmeticTypes[Right]; |
| 2744 | |
| 2745 | // Add this built-in operator as a candidate (VQ is empty). |
| 2746 | ParamTypes[0] = Context.getReferenceType(ArithmeticTypes[Left]); |
| 2747 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2748 | |
| 2749 | // Add this built-in operator as a candidate (VQ is 'volatile'). |
| 2750 | ParamTypes[0] = ArithmeticTypes[Left].withVolatile(); |
| 2751 | ParamTypes[0] = Context.getReferenceType(ParamTypes[0]); |
| 2752 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2753 | } |
| 2754 | } |
| 2755 | break; |
| 2756 | |
| 2757 | case OO_PercentEqual: |
| 2758 | case OO_LessLessEqual: |
| 2759 | case OO_GreaterGreaterEqual: |
| 2760 | case OO_AmpEqual: |
| 2761 | case OO_CaretEqual: |
| 2762 | case OO_PipeEqual: |
| 2763 | // C++ [over.built]p22: |
| 2764 | // |
| 2765 | // For every triple (L, VQ, R), where L is an integral type, VQ |
| 2766 | // is either volatile or empty, and R is a promoted integral |
| 2767 | // type, there exist candidate operator functions of the form |
| 2768 | // |
| 2769 | // VQ L& operator%=(VQ L&, R); |
| 2770 | // VQ L& operator<<=(VQ L&, R); |
| 2771 | // VQ L& operator>>=(VQ L&, R); |
| 2772 | // VQ L& operator&=(VQ L&, R); |
| 2773 | // VQ L& operator^=(VQ L&, R); |
| 2774 | // VQ L& operator|=(VQ L&, R); |
| 2775 | for (unsigned Left = FirstIntegralType; Left < LastIntegralType; ++Left) { |
| 2776 | for (unsigned Right = FirstPromotedIntegralType; |
| 2777 | Right < LastPromotedIntegralType; ++Right) { |
| 2778 | QualType ParamTypes[2]; |
| 2779 | ParamTypes[1] = ArithmeticTypes[Right]; |
| 2780 | |
| 2781 | // Add this built-in operator as a candidate (VQ is empty). |
| 2782 | // FIXME: We should be caching these declarations somewhere, |
| 2783 | // rather than re-building them every time. |
| 2784 | ParamTypes[0] = Context.getReferenceType(ArithmeticTypes[Left]); |
| 2785 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2786 | |
| 2787 | // Add this built-in operator as a candidate (VQ is 'volatile'). |
| 2788 | ParamTypes[0] = ArithmeticTypes[Left]; |
| 2789 | ParamTypes[0].addVolatile(); |
| 2790 | ParamTypes[0] = Context.getReferenceType(ParamTypes[0]); |
| 2791 | AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); |
| 2792 | } |
| 2793 | } |
| 2794 | break; |
| 2795 | |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2796 | case OO_Exclaim: { |
| 2797 | // C++ [over.operator]p23: |
| 2798 | // |
| 2799 | // There also exist candidate operator functions of the form |
| 2800 | // |
| 2801 | // bool operator!(bool); |
| 2802 | // bool operator&&(bool, bool); [BELOW] |
| 2803 | // bool operator||(bool, bool); [BELOW] |
| 2804 | QualType ParamTy = Context.BoolTy; |
| 2805 | AddBuiltinCandidate(ParamTy, &ParamTy, Args, 1, CandidateSet); |
| 2806 | break; |
| 2807 | } |
| 2808 | |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2809 | case OO_AmpAmp: |
| 2810 | case OO_PipePipe: { |
| 2811 | // C++ [over.operator]p23: |
| 2812 | // |
| 2813 | // There also exist candidate operator functions of the form |
| 2814 | // |
Douglas Gregor | 7425373 | 2008-11-19 15:42:04 +0000 | [diff] [blame] | 2815 | // bool operator!(bool); [ABOVE] |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2816 | // bool operator&&(bool, bool); |
| 2817 | // bool operator||(bool, bool); |
| 2818 | QualType ParamTypes[2] = { Context.BoolTy, Context.BoolTy }; |
| 2819 | AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet); |
| 2820 | break; |
| 2821 | } |
| 2822 | |
| 2823 | case OO_Subscript: |
| 2824 | // C++ [over.built]p13: |
| 2825 | // |
| 2826 | // For every cv-qualified or cv-unqualified object type T there |
| 2827 | // exist candidate operator functions of the form |
| 2828 | // |
| 2829 | // T* operator+(T*, ptrdiff_t); [ABOVE] |
| 2830 | // T& operator[](T*, ptrdiff_t); |
| 2831 | // T* operator-(T*, ptrdiff_t); [ABOVE] |
| 2832 | // T* operator+(ptrdiff_t, T*); [ABOVE] |
| 2833 | // T& operator[](ptrdiff_t, T*); |
| 2834 | for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); |
| 2835 | Ptr != CandidateTypes.pointer_end(); ++Ptr) { |
| 2836 | QualType ParamTypes[2] = { *Ptr, Context.getPointerDiffType() }; |
| 2837 | QualType PointeeType = (*Ptr)->getAsPointerType()->getPointeeType(); |
| 2838 | QualType ResultTy = Context.getReferenceType(PointeeType); |
| 2839 | |
| 2840 | // T& operator[](T*, ptrdiff_t) |
| 2841 | AddBuiltinCandidate(ResultTy, ParamTypes, Args, 2, CandidateSet); |
| 2842 | |
| 2843 | // T& operator[](ptrdiff_t, T*); |
| 2844 | ParamTypes[0] = ParamTypes[1]; |
| 2845 | ParamTypes[1] = *Ptr; |
| 2846 | AddBuiltinCandidate(ResultTy, ParamTypes, Args, 2, CandidateSet); |
| 2847 | } |
| 2848 | break; |
| 2849 | |
| 2850 | case OO_ArrowStar: |
| 2851 | // FIXME: No support for pointer-to-members yet. |
| 2852 | break; |
| 2853 | } |
| 2854 | } |
| 2855 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2856 | /// AddOverloadCandidates - Add all of the function overloads in Ovl |
| 2857 | /// to the candidate set. |
| 2858 | void |
Douglas Gregor | 18fe568 | 2008-11-03 20:45:27 +0000 | [diff] [blame] | 2859 | Sema::AddOverloadCandidates(const OverloadedFunctionDecl *Ovl, |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2860 | Expr **Args, unsigned NumArgs, |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 2861 | OverloadCandidateSet& CandidateSet, |
| 2862 | bool SuppressUserConversions) |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2863 | { |
Douglas Gregor | 18fe568 | 2008-11-03 20:45:27 +0000 | [diff] [blame] | 2864 | for (OverloadedFunctionDecl::function_const_iterator Func |
| 2865 | = Ovl->function_begin(); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2866 | Func != Ovl->function_end(); ++Func) |
Douglas Gregor | 225c41e | 2008-11-03 19:09:14 +0000 | [diff] [blame] | 2867 | AddOverloadCandidate(*Func, Args, NumArgs, CandidateSet, |
| 2868 | SuppressUserConversions); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2869 | } |
| 2870 | |
| 2871 | /// isBetterOverloadCandidate - Determines whether the first overload |
| 2872 | /// candidate is a better candidate than the second (C++ 13.3.3p1). |
| 2873 | bool |
| 2874 | Sema::isBetterOverloadCandidate(const OverloadCandidate& Cand1, |
| 2875 | const OverloadCandidate& Cand2) |
| 2876 | { |
| 2877 | // Define viable functions to be better candidates than non-viable |
| 2878 | // functions. |
| 2879 | if (!Cand2.Viable) |
| 2880 | return Cand1.Viable; |
| 2881 | else if (!Cand1.Viable) |
| 2882 | return false; |
| 2883 | |
| 2884 | // FIXME: Deal with the implicit object parameter for static member |
| 2885 | // functions. (C++ 13.3.3p1). |
| 2886 | |
| 2887 | // (C++ 13.3.3p1): a viable function F1 is defined to be a better |
| 2888 | // function than another viable function F2 if for all arguments i, |
| 2889 | // ICSi(F1) is not a worse conversion sequence than ICSi(F2), and |
| 2890 | // then... |
| 2891 | unsigned NumArgs = Cand1.Conversions.size(); |
| 2892 | assert(Cand2.Conversions.size() == NumArgs && "Overload candidate mismatch"); |
| 2893 | bool HasBetterConversion = false; |
| 2894 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { |
| 2895 | switch (CompareImplicitConversionSequences(Cand1.Conversions[ArgIdx], |
| 2896 | Cand2.Conversions[ArgIdx])) { |
| 2897 | case ImplicitConversionSequence::Better: |
| 2898 | // Cand1 has a better conversion sequence. |
| 2899 | HasBetterConversion = true; |
| 2900 | break; |
| 2901 | |
| 2902 | case ImplicitConversionSequence::Worse: |
| 2903 | // Cand1 can't be better than Cand2. |
| 2904 | return false; |
| 2905 | |
| 2906 | case ImplicitConversionSequence::Indistinguishable: |
| 2907 | // Do nothing. |
| 2908 | break; |
| 2909 | } |
| 2910 | } |
| 2911 | |
| 2912 | if (HasBetterConversion) |
| 2913 | return true; |
| 2914 | |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2915 | // FIXME: Several other bullets in (C++ 13.3.3p1) need to be |
| 2916 | // implemented, but they require template support. |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2917 | |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 2918 | // C++ [over.match.best]p1b4: |
| 2919 | // |
| 2920 | // -- the context is an initialization by user-defined conversion |
| 2921 | // (see 8.5, 13.3.1.5) and the standard conversion sequence |
| 2922 | // from the return type of F1 to the destination type (i.e., |
| 2923 | // the type of the entity being initialized) is a better |
| 2924 | // conversion sequence than the standard conversion sequence |
| 2925 | // from the return type of F2 to the destination type. |
Douglas Gregor | 447b69e | 2008-11-19 03:25:36 +0000 | [diff] [blame] | 2926 | if (Cand1.Function && Cand2.Function && |
| 2927 | isa<CXXConversionDecl>(Cand1.Function) && |
Douglas Gregor | f1991ea | 2008-11-07 22:36:19 +0000 | [diff] [blame] | 2928 | isa<CXXConversionDecl>(Cand2.Function)) { |
| 2929 | switch (CompareStandardConversionSequences(Cand1.FinalConversion, |
| 2930 | Cand2.FinalConversion)) { |
| 2931 | case ImplicitConversionSequence::Better: |
| 2932 | // Cand1 has a better conversion sequence. |
| 2933 | return true; |
| 2934 | |
| 2935 | case ImplicitConversionSequence::Worse: |
| 2936 | // Cand1 can't be better than Cand2. |
| 2937 | return false; |
| 2938 | |
| 2939 | case ImplicitConversionSequence::Indistinguishable: |
| 2940 | // Do nothing |
| 2941 | break; |
| 2942 | } |
| 2943 | } |
| 2944 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2945 | return false; |
| 2946 | } |
| 2947 | |
| 2948 | /// BestViableFunction - Computes the best viable function (C++ 13.3.3) |
| 2949 | /// within an overload candidate set. If overloading is successful, |
| 2950 | /// the result will be OR_Success and Best will be set to point to the |
| 2951 | /// best viable function within the candidate set. Otherwise, one of |
| 2952 | /// several kinds of errors will be returned; see |
| 2953 | /// Sema::OverloadingResult. |
| 2954 | Sema::OverloadingResult |
| 2955 | Sema::BestViableFunction(OverloadCandidateSet& CandidateSet, |
| 2956 | OverloadCandidateSet::iterator& Best) |
| 2957 | { |
| 2958 | // Find the best viable function. |
| 2959 | Best = CandidateSet.end(); |
| 2960 | for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); |
| 2961 | Cand != CandidateSet.end(); ++Cand) { |
| 2962 | if (Cand->Viable) { |
| 2963 | if (Best == CandidateSet.end() || isBetterOverloadCandidate(*Cand, *Best)) |
| 2964 | Best = Cand; |
| 2965 | } |
| 2966 | } |
| 2967 | |
| 2968 | // If we didn't find any viable functions, abort. |
| 2969 | if (Best == CandidateSet.end()) |
| 2970 | return OR_No_Viable_Function; |
| 2971 | |
| 2972 | // Make sure that this function is better than every other viable |
| 2973 | // function. If not, we have an ambiguity. |
| 2974 | for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); |
| 2975 | Cand != CandidateSet.end(); ++Cand) { |
| 2976 | if (Cand->Viable && |
| 2977 | Cand != Best && |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 2978 | !isBetterOverloadCandidate(*Best, *Cand)) { |
| 2979 | Best = CandidateSet.end(); |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2980 | return OR_Ambiguous; |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 2981 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 2982 | } |
| 2983 | |
| 2984 | // Best is the best viable function. |
| 2985 | return OR_Success; |
| 2986 | } |
| 2987 | |
| 2988 | /// PrintOverloadCandidates - When overload resolution fails, prints |
| 2989 | /// diagnostic messages containing the candidates in the candidate |
| 2990 | /// set. If OnlyViable is true, only viable candidates will be printed. |
| 2991 | void |
| 2992 | Sema::PrintOverloadCandidates(OverloadCandidateSet& CandidateSet, |
| 2993 | bool OnlyViable) |
| 2994 | { |
| 2995 | OverloadCandidateSet::iterator Cand = CandidateSet.begin(), |
| 2996 | LastCand = CandidateSet.end(); |
| 2997 | for (; Cand != LastCand; ++Cand) { |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 2998 | if (Cand->Viable || !OnlyViable) { |
| 2999 | if (Cand->Function) { |
| 3000 | // Normal function |
| 3001 | Diag(Cand->Function->getLocation(), diag::err_ovl_candidate); |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3002 | } else if (Cand->IsSurrogate) { |
Douglas Gregor | 621b393 | 2008-11-21 02:54:28 +0000 | [diff] [blame] | 3003 | // Desugar the type of the surrogate down to a function type, |
| 3004 | // retaining as many typedefs as possible while still showing |
| 3005 | // the function type (and, therefore, its parameter types). |
| 3006 | QualType FnType = Cand->Surrogate->getConversionType(); |
| 3007 | bool isReference = false; |
| 3008 | bool isPointer = false; |
| 3009 | if (const ReferenceType *FnTypeRef = FnType->getAsReferenceType()) { |
| 3010 | FnType = FnTypeRef->getPointeeType(); |
| 3011 | isReference = true; |
| 3012 | } |
| 3013 | if (const PointerType *FnTypePtr = FnType->getAsPointerType()) { |
| 3014 | FnType = FnTypePtr->getPointeeType(); |
| 3015 | isPointer = true; |
| 3016 | } |
| 3017 | // Desugar down to a function type. |
| 3018 | FnType = QualType(FnType->getAsFunctionType(), 0); |
| 3019 | // Reconstruct the pointer/reference as appropriate. |
| 3020 | if (isPointer) FnType = Context.getPointerType(FnType); |
| 3021 | if (isReference) FnType = Context.getReferenceType(FnType); |
| 3022 | |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3023 | Diag(Cand->Surrogate->getLocation(), diag::err_ovl_surrogate_cand) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 3024 | << FnType; |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 3025 | } else { |
| 3026 | // FIXME: We need to get the identifier in here |
| 3027 | // FIXME: Do we want the error message to point at the |
| 3028 | // operator? (built-ins won't have a location) |
| 3029 | QualType FnType |
| 3030 | = Context.getFunctionType(Cand->BuiltinTypes.ResultTy, |
| 3031 | Cand->BuiltinTypes.ParamTypes, |
| 3032 | Cand->Conversions.size(), |
| 3033 | false, 0); |
| 3034 | |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 3035 | Diag(SourceLocation(), diag::err_ovl_builtin_candidate) << FnType; |
Douglas Gregor | eb8f306 | 2008-11-12 17:17:38 +0000 | [diff] [blame] | 3036 | } |
| 3037 | } |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 3038 | } |
| 3039 | } |
| 3040 | |
Douglas Gregor | 904eed3 | 2008-11-10 20:40:00 +0000 | [diff] [blame] | 3041 | /// ResolveAddressOfOverloadedFunction - Try to resolve the address of |
| 3042 | /// an overloaded function (C++ [over.over]), where @p From is an |
| 3043 | /// expression with overloaded function type and @p ToType is the type |
| 3044 | /// we're trying to resolve to. For example: |
| 3045 | /// |
| 3046 | /// @code |
| 3047 | /// int f(double); |
| 3048 | /// int f(int); |
| 3049 | /// |
| 3050 | /// int (*pfd)(double) = f; // selects f(double) |
| 3051 | /// @endcode |
| 3052 | /// |
| 3053 | /// This routine returns the resulting FunctionDecl if it could be |
| 3054 | /// resolved, and NULL otherwise. When @p Complain is true, this |
| 3055 | /// routine will emit diagnostics if there is an error. |
| 3056 | FunctionDecl * |
| 3057 | Sema::ResolveAddressOfOverloadedFunction(Expr *From, QualType ToType, |
| 3058 | bool Complain) { |
| 3059 | QualType FunctionType = ToType; |
| 3060 | if (const PointerLikeType *ToTypePtr = ToType->getAsPointerLikeType()) |
| 3061 | FunctionType = ToTypePtr->getPointeeType(); |
| 3062 | |
| 3063 | // We only look at pointers or references to functions. |
| 3064 | if (!FunctionType->isFunctionType()) |
| 3065 | return 0; |
| 3066 | |
| 3067 | // Find the actual overloaded function declaration. |
| 3068 | OverloadedFunctionDecl *Ovl = 0; |
| 3069 | |
| 3070 | // C++ [over.over]p1: |
| 3071 | // [...] [Note: any redundant set of parentheses surrounding the |
| 3072 | // overloaded function name is ignored (5.1). ] |
| 3073 | Expr *OvlExpr = From->IgnoreParens(); |
| 3074 | |
| 3075 | // C++ [over.over]p1: |
| 3076 | // [...] The overloaded function name can be preceded by the & |
| 3077 | // operator. |
| 3078 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(OvlExpr)) { |
| 3079 | if (UnOp->getOpcode() == UnaryOperator::AddrOf) |
| 3080 | OvlExpr = UnOp->getSubExpr()->IgnoreParens(); |
| 3081 | } |
| 3082 | |
| 3083 | // Try to dig out the overloaded function. |
| 3084 | if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(OvlExpr)) |
| 3085 | Ovl = dyn_cast<OverloadedFunctionDecl>(DR->getDecl()); |
| 3086 | |
| 3087 | // If there's no overloaded function declaration, we're done. |
| 3088 | if (!Ovl) |
| 3089 | return 0; |
| 3090 | |
| 3091 | // Look through all of the overloaded functions, searching for one |
| 3092 | // whose type matches exactly. |
| 3093 | // FIXME: When templates or using declarations come along, we'll actually |
| 3094 | // have to deal with duplicates, partial ordering, etc. For now, we |
| 3095 | // can just do a simple search. |
| 3096 | FunctionType = Context.getCanonicalType(FunctionType.getUnqualifiedType()); |
| 3097 | for (OverloadedFunctionDecl::function_iterator Fun = Ovl->function_begin(); |
| 3098 | Fun != Ovl->function_end(); ++Fun) { |
| 3099 | // C++ [over.over]p3: |
| 3100 | // Non-member functions and static member functions match |
| 3101 | // targets of type “pointer-to-function”or |
| 3102 | // “reference-to-function.” |
| 3103 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*Fun)) |
| 3104 | if (!Method->isStatic()) |
| 3105 | continue; |
| 3106 | |
| 3107 | if (FunctionType == Context.getCanonicalType((*Fun)->getType())) |
| 3108 | return *Fun; |
| 3109 | } |
| 3110 | |
| 3111 | return 0; |
| 3112 | } |
| 3113 | |
Douglas Gregor | f6b8969 | 2008-11-26 05:54:23 +0000 | [diff] [blame] | 3114 | /// ResolveOverloadedCallFn - Given the call expression that calls Fn |
| 3115 | /// (which eventually refers to the set of overloaded functions in |
| 3116 | /// Ovl) and the call arguments Args/NumArgs, attempt to resolve the |
| 3117 | /// function call down to a specific function. If overload resolution |
Douglas Gregor | 0a39668 | 2008-11-26 06:01:48 +0000 | [diff] [blame] | 3118 | /// succeeds, returns the function declaration produced by overload |
| 3119 | /// resolution. Otherwise, emits diagnostics, deletes all of the |
Douglas Gregor | f6b8969 | 2008-11-26 05:54:23 +0000 | [diff] [blame] | 3120 | /// arguments and Fn, and returns NULL. |
Douglas Gregor | 0a39668 | 2008-11-26 06:01:48 +0000 | [diff] [blame] | 3121 | FunctionDecl *Sema::ResolveOverloadedCallFn(Expr *Fn, OverloadedFunctionDecl *Ovl, |
| 3122 | SourceLocation LParenLoc, |
| 3123 | Expr **Args, unsigned NumArgs, |
| 3124 | SourceLocation *CommaLocs, |
| 3125 | SourceLocation RParenLoc) { |
Douglas Gregor | f6b8969 | 2008-11-26 05:54:23 +0000 | [diff] [blame] | 3126 | OverloadCandidateSet CandidateSet; |
| 3127 | AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); |
| 3128 | OverloadCandidateSet::iterator Best; |
| 3129 | switch (BestViableFunction(CandidateSet, Best)) { |
Douglas Gregor | 0a39668 | 2008-11-26 06:01:48 +0000 | [diff] [blame] | 3130 | case OR_Success: |
| 3131 | return Best->Function; |
Douglas Gregor | f6b8969 | 2008-11-26 05:54:23 +0000 | [diff] [blame] | 3132 | |
| 3133 | case OR_No_Viable_Function: |
| 3134 | Diag(Fn->getSourceRange().getBegin(), |
| 3135 | diag::err_ovl_no_viable_function_in_call) |
| 3136 | << Ovl->getDeclName() << (unsigned)CandidateSet.size() |
| 3137 | << Fn->getSourceRange(); |
| 3138 | PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); |
| 3139 | break; |
| 3140 | |
| 3141 | case OR_Ambiguous: |
| 3142 | Diag(Fn->getSourceRange().getBegin(), diag::err_ovl_ambiguous_call) |
| 3143 | << Ovl->getDeclName() << Fn->getSourceRange(); |
| 3144 | PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); |
| 3145 | break; |
| 3146 | } |
| 3147 | |
| 3148 | // Overload resolution failed. Destroy all of the subexpressions and |
| 3149 | // return NULL. |
| 3150 | Fn->Destroy(Context); |
| 3151 | for (unsigned Arg = 0; Arg < NumArgs; ++Arg) |
| 3152 | Args[Arg]->Destroy(Context); |
| 3153 | return 0; |
| 3154 | } |
| 3155 | |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3156 | /// BuildCallToObjectOfClassType - Build a call to an object of class |
| 3157 | /// type (C++ [over.call.object]), which can end up invoking an |
| 3158 | /// overloaded function call operator (@c operator()) or performing a |
| 3159 | /// user-defined conversion on the object argument. |
| 3160 | Action::ExprResult |
Douglas Gregor | 5c37de7 | 2008-12-06 00:22:45 +0000 | [diff] [blame] | 3161 | Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object, |
| 3162 | SourceLocation LParenLoc, |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3163 | Expr **Args, unsigned NumArgs, |
| 3164 | SourceLocation *CommaLocs, |
| 3165 | SourceLocation RParenLoc) { |
| 3166 | assert(Object->getType()->isRecordType() && "Requires object type argument"); |
| 3167 | const RecordType *Record = Object->getType()->getAsRecordType(); |
| 3168 | |
| 3169 | // C++ [over.call.object]p1: |
| 3170 | // If the primary-expression E in the function call syntax |
| 3171 | // evaluates to a class object of type “cv T”, then the set of |
| 3172 | // candidate functions includes at least the function call |
| 3173 | // operators of T. The function call operators of T are obtained by |
| 3174 | // ordinary lookup of the name operator() in the context of |
| 3175 | // (E).operator(). |
| 3176 | OverloadCandidateSet CandidateSet; |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 3177 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(OO_Call); |
| 3178 | DeclContext::lookup_const_result Lookup |
Douglas Gregor | e267ff3 | 2008-12-11 20:41:00 +0000 | [diff] [blame] | 3179 | = Record->getDecl()->lookup(Context, OpName); |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 3180 | NamedDecl *MemberOps = (Lookup.first == Lookup.second)? 0 : *Lookup.first; |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3181 | if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(MemberOps)) |
| 3182 | AddMethodCandidate(Method, Object, Args, NumArgs, CandidateSet, |
| 3183 | /*SuppressUserConversions=*/false); |
| 3184 | else if (OverloadedFunctionDecl *Ovl |
| 3185 | = dyn_cast_or_null<OverloadedFunctionDecl>(MemberOps)) { |
| 3186 | for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), |
| 3187 | FEnd = Ovl->function_end(); |
| 3188 | F != FEnd; ++F) { |
| 3189 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*F)) |
| 3190 | AddMethodCandidate(Method, Object, Args, NumArgs, CandidateSet, |
| 3191 | /*SuppressUserConversions=*/false); |
| 3192 | } |
| 3193 | } |
| 3194 | |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3195 | // C++ [over.call.object]p2: |
| 3196 | // In addition, for each conversion function declared in T of the |
| 3197 | // form |
| 3198 | // |
| 3199 | // operator conversion-type-id () cv-qualifier; |
| 3200 | // |
| 3201 | // where cv-qualifier is the same cv-qualification as, or a |
| 3202 | // greater cv-qualification than, cv, and where conversion-type-id |
Douglas Gregor | a967a6f | 2008-11-20 13:33:37 +0000 | [diff] [blame] | 3203 | // denotes the type "pointer to function of (P1,...,Pn) returning |
| 3204 | // R", or the type "reference to pointer to function of |
| 3205 | // (P1,...,Pn) returning R", or the type "reference to function |
| 3206 | // of (P1,...,Pn) returning R", a surrogate call function [...] |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3207 | // is also considered as a candidate function. Similarly, |
| 3208 | // surrogate call functions are added to the set of candidate |
| 3209 | // functions for each conversion function declared in an |
| 3210 | // accessible base class provided the function is not hidden |
| 3211 | // within T by another intervening declaration. |
| 3212 | // |
| 3213 | // FIXME: Look in base classes for more conversion operators! |
| 3214 | OverloadedFunctionDecl *Conversions |
| 3215 | = cast<CXXRecordDecl>(Record->getDecl())->getConversionFunctions(); |
Douglas Gregor | 621b393 | 2008-11-21 02:54:28 +0000 | [diff] [blame] | 3216 | for (OverloadedFunctionDecl::function_iterator |
| 3217 | Func = Conversions->function_begin(), |
| 3218 | FuncEnd = Conversions->function_end(); |
| 3219 | Func != FuncEnd; ++Func) { |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3220 | CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); |
| 3221 | |
| 3222 | // Strip the reference type (if any) and then the pointer type (if |
| 3223 | // any) to get down to what might be a function type. |
| 3224 | QualType ConvType = Conv->getConversionType().getNonReferenceType(); |
| 3225 | if (const PointerType *ConvPtrType = ConvType->getAsPointerType()) |
| 3226 | ConvType = ConvPtrType->getPointeeType(); |
| 3227 | |
| 3228 | if (const FunctionTypeProto *Proto = ConvType->getAsFunctionTypeProto()) |
| 3229 | AddSurrogateCandidate(Conv, Proto, Object, Args, NumArgs, CandidateSet); |
| 3230 | } |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3231 | |
| 3232 | // Perform overload resolution. |
| 3233 | OverloadCandidateSet::iterator Best; |
| 3234 | switch (BestViableFunction(CandidateSet, Best)) { |
| 3235 | case OR_Success: |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3236 | // Overload resolution succeeded; we'll build the appropriate call |
| 3237 | // below. |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3238 | break; |
| 3239 | |
| 3240 | case OR_No_Viable_Function: |
Sebastian Redl | e4c452c | 2008-11-22 13:44:36 +0000 | [diff] [blame] | 3241 | Diag(Object->getSourceRange().getBegin(), |
| 3242 | diag::err_ovl_no_viable_object_call) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 3243 | << Object->getType() << (unsigned)CandidateSet.size() |
Sebastian Redl | e4c452c | 2008-11-22 13:44:36 +0000 | [diff] [blame] | 3244 | << Object->getSourceRange(); |
| 3245 | PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3246 | break; |
| 3247 | |
| 3248 | case OR_Ambiguous: |
| 3249 | Diag(Object->getSourceRange().getBegin(), |
| 3250 | diag::err_ovl_ambiguous_object_call) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 3251 | << Object->getType() << Object->getSourceRange(); |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3252 | PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); |
| 3253 | break; |
| 3254 | } |
| 3255 | |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3256 | if (Best == CandidateSet.end()) { |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3257 | // We had an error; delete all of the subexpressions and return |
| 3258 | // the error. |
| 3259 | delete Object; |
| 3260 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) |
| 3261 | delete Args[ArgIdx]; |
| 3262 | return true; |
| 3263 | } |
| 3264 | |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3265 | if (Best->Function == 0) { |
| 3266 | // Since there is no function declaration, this is one of the |
| 3267 | // surrogate candidates. Dig out the conversion function. |
| 3268 | CXXConversionDecl *Conv |
| 3269 | = cast<CXXConversionDecl>( |
| 3270 | Best->Conversions[0].UserDefined.ConversionFunction); |
| 3271 | |
| 3272 | // We selected one of the surrogate functions that converts the |
| 3273 | // object parameter to a function pointer. Perform the conversion |
| 3274 | // on the object argument, then let ActOnCallExpr finish the job. |
| 3275 | // FIXME: Represent the user-defined conversion in the AST! |
| 3276 | ImpCastExprToType(Object, |
| 3277 | Conv->getConversionType().getNonReferenceType(), |
| 3278 | Conv->getConversionType()->isReferenceType()); |
Douglas Gregor | 5c37de7 | 2008-12-06 00:22:45 +0000 | [diff] [blame] | 3279 | return ActOnCallExpr(S, (ExprTy*)Object, LParenLoc, (ExprTy**)Args, NumArgs, |
Douglas Gregor | 106c6eb | 2008-11-19 22:57:39 +0000 | [diff] [blame] | 3280 | CommaLocs, RParenLoc); |
| 3281 | } |
| 3282 | |
| 3283 | // We found an overloaded operator(). Build a CXXOperatorCallExpr |
| 3284 | // that calls this method, using Object for the implicit object |
| 3285 | // parameter and passing along the remaining arguments. |
| 3286 | CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); |
Douglas Gregor | f9eb905 | 2008-11-19 21:05:33 +0000 | [diff] [blame] | 3287 | const FunctionTypeProto *Proto = Method->getType()->getAsFunctionTypeProto(); |
| 3288 | |
| 3289 | unsigned NumArgsInProto = Proto->getNumArgs(); |
| 3290 | unsigned NumArgsToCheck = NumArgs; |
| 3291 | |
| 3292 | // Build the full argument list for the method call (the |
| 3293 | // implicit object parameter is placed at the beginning of the |
| 3294 | // list). |
| 3295 | Expr **MethodArgs; |
| 3296 | if (NumArgs < NumArgsInProto) { |
| 3297 | NumArgsToCheck = NumArgsInProto; |
| 3298 | MethodArgs = new Expr*[NumArgsInProto + 1]; |
| 3299 | } else { |
| 3300 | MethodArgs = new Expr*[NumArgs + 1]; |
| 3301 | } |
| 3302 | MethodArgs[0] = Object; |
| 3303 | for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) |
| 3304 | MethodArgs[ArgIdx + 1] = Args[ArgIdx]; |
| 3305 | |
| 3306 | Expr *NewFn = new DeclRefExpr(Method, Method->getType(), |
| 3307 | SourceLocation()); |
| 3308 | UsualUnaryConversions(NewFn); |
| 3309 | |
| 3310 | // Once we've built TheCall, all of the expressions are properly |
| 3311 | // owned. |
| 3312 | QualType ResultTy = Method->getResultType().getNonReferenceType(); |
| 3313 | llvm::OwningPtr<CXXOperatorCallExpr> |
| 3314 | TheCall(new CXXOperatorCallExpr(NewFn, MethodArgs, NumArgs + 1, |
| 3315 | ResultTy, RParenLoc)); |
| 3316 | delete [] MethodArgs; |
| 3317 | |
| 3318 | // Initialize the implicit object parameter. |
| 3319 | if (!PerformObjectArgumentInitialization(Object, Method)) |
| 3320 | return true; |
| 3321 | TheCall->setArg(0, Object); |
| 3322 | |
| 3323 | // Check the argument types. |
| 3324 | for (unsigned i = 0; i != NumArgsToCheck; i++) { |
| 3325 | QualType ProtoArgType = Proto->getArgType(i); |
| 3326 | |
| 3327 | Expr *Arg; |
| 3328 | if (i < NumArgs) |
| 3329 | Arg = Args[i]; |
| 3330 | else |
| 3331 | Arg = new CXXDefaultArgExpr(Method->getParamDecl(i)); |
| 3332 | QualType ArgType = Arg->getType(); |
| 3333 | |
| 3334 | // Pass the argument. |
| 3335 | if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) |
| 3336 | return true; |
| 3337 | |
| 3338 | TheCall->setArg(i + 1, Arg); |
| 3339 | } |
| 3340 | |
| 3341 | // If this is a variadic call, handle args passed through "...". |
| 3342 | if (Proto->isVariadic()) { |
| 3343 | // Promote the arguments (C99 6.5.2.2p7). |
| 3344 | for (unsigned i = NumArgsInProto; i != NumArgs; i++) { |
| 3345 | Expr *Arg = Args[i]; |
| 3346 | DefaultArgumentPromotion(Arg); |
| 3347 | TheCall->setArg(i + 1, Arg); |
| 3348 | } |
| 3349 | } |
| 3350 | |
| 3351 | return CheckFunctionCall(Method, TheCall.take()); |
| 3352 | } |
| 3353 | |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3354 | /// BuildOverloadedArrowExpr - Build a call to an overloaded @c operator-> |
| 3355 | /// (if one exists), where @c Base is an expression of class type and |
| 3356 | /// @c Member is the name of the member we're trying to find. |
| 3357 | Action::ExprResult |
| 3358 | Sema::BuildOverloadedArrowExpr(Expr *Base, SourceLocation OpLoc, |
| 3359 | SourceLocation MemberLoc, |
| 3360 | IdentifierInfo &Member) { |
| 3361 | assert(Base->getType()->isRecordType() && "left-hand side must have class type"); |
| 3362 | |
| 3363 | // C++ [over.ref]p1: |
| 3364 | // |
| 3365 | // [...] An expression x->m is interpreted as (x.operator->())->m |
| 3366 | // for a class object x of type T if T::operator->() exists and if |
| 3367 | // the operator is selected as the best match function by the |
| 3368 | // overload resolution mechanism (13.3). |
| 3369 | // FIXME: look in base classes. |
| 3370 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(OO_Arrow); |
| 3371 | OverloadCandidateSet CandidateSet; |
| 3372 | const RecordType *BaseRecord = Base->getType()->getAsRecordType(); |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 3373 | DeclContext::lookup_const_result Lookup |
Douglas Gregor | e267ff3 | 2008-12-11 20:41:00 +0000 | [diff] [blame] | 3374 | = BaseRecord->getDecl()->lookup(Context, OpName); |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 3375 | NamedDecl *MemberOps = (Lookup.first == Lookup.second)? 0 : *Lookup.first; |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3376 | if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(MemberOps)) |
| 3377 | AddMethodCandidate(Method, Base, 0, 0, CandidateSet, |
| 3378 | /*SuppressUserConversions=*/false); |
| 3379 | else if (OverloadedFunctionDecl *Ovl |
| 3380 | = dyn_cast_or_null<OverloadedFunctionDecl>(MemberOps)) { |
| 3381 | for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), |
| 3382 | FEnd = Ovl->function_end(); |
| 3383 | F != FEnd; ++F) { |
| 3384 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*F)) |
| 3385 | AddMethodCandidate(Method, Base, 0, 0, CandidateSet, |
| 3386 | /*SuppressUserConversions=*/false); |
| 3387 | } |
| 3388 | } |
| 3389 | |
Douglas Gregor | fc195ef | 2008-11-21 03:04:22 +0000 | [diff] [blame] | 3390 | llvm::OwningPtr<Expr> BasePtr(Base); |
| 3391 | |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3392 | // Perform overload resolution. |
| 3393 | OverloadCandidateSet::iterator Best; |
| 3394 | switch (BestViableFunction(CandidateSet, Best)) { |
| 3395 | case OR_Success: |
| 3396 | // Overload resolution succeeded; we'll build the call below. |
| 3397 | break; |
| 3398 | |
| 3399 | case OR_No_Viable_Function: |
| 3400 | if (CandidateSet.empty()) |
| 3401 | Diag(OpLoc, diag::err_typecheck_member_reference_arrow) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 3402 | << BasePtr->getType() << BasePtr->getSourceRange(); |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3403 | else |
| 3404 | Diag(OpLoc, diag::err_ovl_no_viable_oper) |
Sebastian Redl | e4c452c | 2008-11-22 13:44:36 +0000 | [diff] [blame] | 3405 | << "operator->" << (unsigned)CandidateSet.size() |
| 3406 | << BasePtr->getSourceRange(); |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3407 | PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3408 | return true; |
| 3409 | |
| 3410 | case OR_Ambiguous: |
| 3411 | Diag(OpLoc, diag::err_ovl_ambiguous_oper) |
Chris Lattner | d162584 | 2008-11-24 06:25:27 +0000 | [diff] [blame] | 3412 | << "operator->" << BasePtr->getSourceRange(); |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3413 | PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3414 | return true; |
| 3415 | } |
| 3416 | |
| 3417 | // Convert the object parameter. |
| 3418 | CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); |
Douglas Gregor | fc195ef | 2008-11-21 03:04:22 +0000 | [diff] [blame] | 3419 | if (PerformObjectArgumentInitialization(Base, Method)) |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3420 | return true; |
Douglas Gregor | fc195ef | 2008-11-21 03:04:22 +0000 | [diff] [blame] | 3421 | |
| 3422 | // No concerns about early exits now. |
| 3423 | BasePtr.take(); |
Douglas Gregor | 8ba1074 | 2008-11-20 16:27:02 +0000 | [diff] [blame] | 3424 | |
| 3425 | // Build the operator call. |
| 3426 | Expr *FnExpr = new DeclRefExpr(Method, Method->getType(), SourceLocation()); |
| 3427 | UsualUnaryConversions(FnExpr); |
| 3428 | Base = new CXXOperatorCallExpr(FnExpr, &Base, 1, |
| 3429 | Method->getResultType().getNonReferenceType(), |
| 3430 | OpLoc); |
| 3431 | return ActOnMemberReferenceExpr(Base, OpLoc, tok::arrow, MemberLoc, Member); |
| 3432 | } |
| 3433 | |
Douglas Gregor | 904eed3 | 2008-11-10 20:40:00 +0000 | [diff] [blame] | 3434 | /// FixOverloadedFunctionReference - E is an expression that refers to |
| 3435 | /// a C++ overloaded function (possibly with some parentheses and |
| 3436 | /// perhaps a '&' around it). We have resolved the overloaded function |
| 3437 | /// to the function declaration Fn, so patch up the expression E to |
| 3438 | /// refer (possibly indirectly) to Fn. |
| 3439 | void Sema::FixOverloadedFunctionReference(Expr *E, FunctionDecl *Fn) { |
| 3440 | if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) { |
| 3441 | FixOverloadedFunctionReference(PE->getSubExpr(), Fn); |
| 3442 | E->setType(PE->getSubExpr()->getType()); |
| 3443 | } else if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(E)) { |
| 3444 | assert(UnOp->getOpcode() == UnaryOperator::AddrOf && |
| 3445 | "Can only take the address of an overloaded function"); |
| 3446 | FixOverloadedFunctionReference(UnOp->getSubExpr(), Fn); |
| 3447 | E->setType(Context.getPointerType(E->getType())); |
| 3448 | } else if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E)) { |
| 3449 | assert(isa<OverloadedFunctionDecl>(DR->getDecl()) && |
| 3450 | "Expected overloaded function"); |
| 3451 | DR->setDecl(Fn); |
| 3452 | E->setType(Fn->getType()); |
| 3453 | } else { |
| 3454 | assert(false && "Invalid reference to overloaded function"); |
| 3455 | } |
| 3456 | } |
| 3457 | |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 3458 | } // end namespace clang |