Casting.h revision b2109ce97881269a610fa4afbcbca350e975174d
148486893f46d2e12e926682a3ecb908716bc66c4Chris Lattner//===-- Support/Casting.h - Allow flexible, checked, casts ------*- C++ -*-===// 2b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// 3b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// The LLVM Compiler Infrastructure 4b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// 5b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// This file was developed by the LLVM research group and is distributed under 6b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// the University of Illinois Open Source License. See LICENSE.TXT for details. 7b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// 8b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell//===----------------------------------------------------------------------===// 9589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 10589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// This file defines the isa<X>(), cast<X>(), dyn_cast<X>(), cast_or_null<X>(), 11589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// and dyn_cast_or_null<X>() templates. 12589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 13589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner//===----------------------------------------------------------------------===// 14589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 15589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner#ifndef SUPPORT_CASTING_H 16589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner#define SUPPORT_CASTING_H 17589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 18589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner//===----------------------------------------------------------------------===// 197e70829632f82de15db187845666aaca6e04b792Chris Lattner// isa<x> Support Templates 20589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner//===----------------------------------------------------------------------===// 21589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 227e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename FromCl> struct isa_impl_cl; 237e70829632f82de15db187845666aaca6e04b792Chris Lattner 247e70829632f82de15db187845666aaca6e04b792Chris Lattner// Define a template that can be specialized by smart pointers to reflect the 257e70829632f82de15db187845666aaca6e04b792Chris Lattner// fact that they are automatically dereferenced, and are not involved with the 267e70829632f82de15db187845666aaca6e04b792Chris Lattner// template selection process... the default implementation is a noop. 277e70829632f82de15db187845666aaca6e04b792Chris Lattner// 287e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename From> struct simplify_type { 297e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef From SimpleType; // The real type this represents... 307e70829632f82de15db187845666aaca6e04b792Chris Lattner 317e70829632f82de15db187845666aaca6e04b792Chris Lattner // An accessor to get the real value... 327e70829632f82de15db187845666aaca6e04b792Chris Lattner static SimpleType &getSimplifiedValue(From &Val) { return Val; } 337e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 347e70829632f82de15db187845666aaca6e04b792Chris Lattner 357e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename From> struct simplify_type<const From> { 367e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef const From SimpleType; 377e70829632f82de15db187845666aaca6e04b792Chris Lattner static SimpleType &getSimplifiedValue(const From &Val) { 387e70829632f82de15db187845666aaca6e04b792Chris Lattner return simplify_type<From>::getSimplifiedValue((From&)Val); 397e70829632f82de15db187845666aaca6e04b792Chris Lattner } 407e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 417e70829632f82de15db187845666aaca6e04b792Chris Lattner 427e70829632f82de15db187845666aaca6e04b792Chris Lattner 43589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// isa<X> - Return true if the parameter to the template is an instance of the 44589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// template type argument. Used like this: 45589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 467e70829632f82de15db187845666aaca6e04b792Chris Lattner// if (isa<Type*>(myVal)) { ... } 477e70829632f82de15db187845666aaca6e04b792Chris Lattner// 487e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate <typename To, typename From> 497e70829632f82de15db187845666aaca6e04b792Chris Lattnerinline bool isa_impl(const From &Val) { 507e70829632f82de15db187845666aaca6e04b792Chris Lattner return To::classof(&Val); 517e70829632f82de15db187845666aaca6e04b792Chris Lattner} 527e70829632f82de15db187845666aaca6e04b792Chris Lattner 537e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename To, typename From, typename SimpleType> 547e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct isa_impl_wrap { 557e70829632f82de15db187845666aaca6e04b792Chris Lattner // When From != SimplifiedType, we can simplify the type some more by using 567e70829632f82de15db187845666aaca6e04b792Chris Lattner // the simplify_type template. 577e70829632f82de15db187845666aaca6e04b792Chris Lattner static bool doit(const From &Val) { 587e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl_cl<const SimpleType>::template 597e70829632f82de15db187845666aaca6e04b792Chris Lattner isa<To>(simplify_type<const From>::getSimplifiedValue(Val)); 607e70829632f82de15db187845666aaca6e04b792Chris Lattner } 617e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 627e70829632f82de15db187845666aaca6e04b792Chris Lattner 637e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename To, typename FromTy> 647e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct isa_impl_wrap<To, const FromTy, const FromTy> { 657e70829632f82de15db187845666aaca6e04b792Chris Lattner // When From == SimpleType, we are as simple as we are going to get. 667e70829632f82de15db187845666aaca6e04b792Chris Lattner static bool doit(const FromTy &Val) { 677e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl<To,FromTy>(Val); 687e70829632f82de15db187845666aaca6e04b792Chris Lattner } 697e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 707e70829632f82de15db187845666aaca6e04b792Chris Lattner 717e70829632f82de15db187845666aaca6e04b792Chris Lattner// isa_impl_cl - Use class partial specialization to transform types to a single 72776f776838d6e2f83d899bc99452dc83779c341bChris Lattner// canonical form for isa_impl. 73589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 747e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename FromCl> 757e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct isa_impl_cl { 767e70829632f82de15db187845666aaca6e04b792Chris Lattner template<class ToCl> 777e70829632f82de15db187845666aaca6e04b792Chris Lattner static bool isa(const FromCl &Val) { 787e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl_wrap<ToCl,const FromCl, 795a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner typename simplify_type<const FromCl>::SimpleType>::doit(Val); 807e70829632f82de15db187845666aaca6e04b792Chris Lattner } 817e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 827e70829632f82de15db187845666aaca6e04b792Chris Lattner 837e70829632f82de15db187845666aaca6e04b792Chris Lattner// Specialization used to strip const qualifiers off of the FromCl type... 847e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<typename FromCl> 857e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct isa_impl_cl<const FromCl> { 867e70829632f82de15db187845666aaca6e04b792Chris Lattner template<class ToCl> 877e70829632f82de15db187845666aaca6e04b792Chris Lattner static bool isa(const FromCl &Val) { 887e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl_cl<FromCl>::template isa<ToCl>(Val); 897e70829632f82de15db187845666aaca6e04b792Chris Lattner } 907e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 917e70829632f82de15db187845666aaca6e04b792Chris Lattner 927e70829632f82de15db187845666aaca6e04b792Chris Lattner// Define pointer traits in terms of base traits... 937e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class FromCl> 947e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct isa_impl_cl<FromCl*> { 957e70829632f82de15db187845666aaca6e04b792Chris Lattner template<class ToCl> 967e70829632f82de15db187845666aaca6e04b792Chris Lattner static bool isa(FromCl *Val) { 977e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl_cl<FromCl>::template isa<ToCl>(*Val); 987e70829632f82de15db187845666aaca6e04b792Chris Lattner } 997e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1007e70829632f82de15db187845666aaca6e04b792Chris Lattner 1017e70829632f82de15db187845666aaca6e04b792Chris Lattner// Define reference traits in terms of base traits... 1027e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class FromCl> 1037e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct isa_impl_cl<FromCl&> { 1047e70829632f82de15db187845666aaca6e04b792Chris Lattner template<class ToCl> 1057e70829632f82de15db187845666aaca6e04b792Chris Lattner static bool isa(FromCl &Val) { 1067e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl_cl<FromCl>::template isa<ToCl>(&Val); 1077e70829632f82de15db187845666aaca6e04b792Chris Lattner } 1087e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1097e70829632f82de15db187845666aaca6e04b792Chris Lattner 110589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattnertemplate <class X, class Y> 1117e70829632f82de15db187845666aaca6e04b792Chris Lattnerinline bool isa(const Y &Val) { 1127e70829632f82de15db187845666aaca6e04b792Chris Lattner return isa_impl_cl<Y>::template isa<X>(Val); 113589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner} 114589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 1157e70829632f82de15db187845666aaca6e04b792Chris Lattner//===----------------------------------------------------------------------===// 1167e70829632f82de15db187845666aaca6e04b792Chris Lattner// cast<x> Support Templates 1177e70829632f82de15db187845666aaca6e04b792Chris Lattner//===----------------------------------------------------------------------===// 1187e70829632f82de15db187845666aaca6e04b792Chris Lattner 1197e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> struct cast_retty; 1207e70829632f82de15db187845666aaca6e04b792Chris Lattner 1217e70829632f82de15db187845666aaca6e04b792Chris Lattner 1227e70829632f82de15db187845666aaca6e04b792Chris Lattner// Calculate what type the 'cast' function should return, based on a requested 1237e70829632f82de15db187845666aaca6e04b792Chris Lattner// type of To and a source type of From. 1247e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> struct cast_retty_impl { 1257e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef To& ret_type; // Normal case, return Ty& 1267e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1277e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> struct cast_retty_impl<To, const From> { 1287e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef const To &ret_type; // Normal case, return Ty& 1297e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1307e70829632f82de15db187845666aaca6e04b792Chris Lattner 1317e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> struct cast_retty_impl<To, From*> { 1327e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef To* ret_type; // Pointer arg case, return Ty* 1337e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1347e70829632f82de15db187845666aaca6e04b792Chris Lattner 1357e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> struct cast_retty_impl<To, const From*> { 1367e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef const To* ret_type; // Constant pointer arg case, return const Ty* 1377e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1387e70829632f82de15db187845666aaca6e04b792Chris Lattner 1397e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> struct cast_retty_impl<To, const From*const> { 1407e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef const To* ret_type; // Constant pointer arg case, return const Ty* 1417e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1427e70829632f82de15db187845666aaca6e04b792Chris Lattner 1437e70829632f82de15db187845666aaca6e04b792Chris Lattner 1447e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From, class SimpleFrom> 1457e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct cast_retty_wrap { 1467e70829632f82de15db187845666aaca6e04b792Chris Lattner // When the simplified type and the from type are not the same, use the type 1477e70829632f82de15db187845666aaca6e04b792Chris Lattner // simplifier to reduce the type, then reuse cast_retty_impl to get the 1487e70829632f82de15db187845666aaca6e04b792Chris Lattner // resultant type. 1497e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef typename cast_retty<To, SimpleFrom>::ret_type ret_type; 1507e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1517e70829632f82de15db187845666aaca6e04b792Chris Lattner 1527e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class FromTy> 1537e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct cast_retty_wrap<To, FromTy, FromTy> { 1547e70829632f82de15db187845666aaca6e04b792Chris Lattner // When the simplified type is equal to the from type, use it directly. 1557e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef typename cast_retty_impl<To,FromTy>::ret_type ret_type; 1567e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1577e70829632f82de15db187845666aaca6e04b792Chris Lattner 1587e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From> 1597e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct cast_retty { 1607e70829632f82de15db187845666aaca6e04b792Chris Lattner typedef typename cast_retty_wrap<To, From, 1615a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner typename simplify_type<From>::SimpleType>::ret_type ret_type; 1627e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1637e70829632f82de15db187845666aaca6e04b792Chris Lattner 1647e70829632f82de15db187845666aaca6e04b792Chris Lattner// Ensure the non-simple values are converted using the simplify_type template 1657e70829632f82de15db187845666aaca6e04b792Chris Lattner// that may be specialized by smart pointers... 1667e70829632f82de15db187845666aaca6e04b792Chris Lattner// 1677e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class From, class SimpleFrom> struct cast_convert_val { 1687e70829632f82de15db187845666aaca6e04b792Chris Lattner // This is not a simple type, use the template to simplify it... 1695a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner static typename cast_retty<To, From>::ret_type doit(const From &Val) { 1707e70829632f82de15db187845666aaca6e04b792Chris Lattner return cast_convert_val<To, SimpleFrom, 1715a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner typename simplify_type<SimpleFrom>::SimpleType>::doit( 1727e70829632f82de15db187845666aaca6e04b792Chris Lattner simplify_type<From>::getSimplifiedValue(Val)); 1737e70829632f82de15db187845666aaca6e04b792Chris Lattner } 1747e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1757e70829632f82de15db187845666aaca6e04b792Chris Lattner 1767e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate<class To, class FromTy> struct cast_convert_val<To,FromTy,FromTy> { 1777e70829632f82de15db187845666aaca6e04b792Chris Lattner // This _is_ a simple type, just cast it. 1785a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner static typename cast_retty<To, FromTy>::ret_type doit(const FromTy &Val) { 1795a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner return (typename cast_retty<To, FromTy>::ret_type)Val; 1807e70829632f82de15db187845666aaca6e04b792Chris Lattner } 1817e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 1827e70829632f82de15db187845666aaca6e04b792Chris Lattner 1837e70829632f82de15db187845666aaca6e04b792Chris Lattner 184589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 185589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// cast<X> - Return the argument parameter cast to the specified type. This 186589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// casting operator asserts that the type is correct, so it does not return null 187589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// on failure. But it will correctly return NULL when the input is NULL. 188589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// Used Like this: 189589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 1907e70829632f82de15db187845666aaca6e04b792Chris Lattner// cast<Instruction>(myVal)->getParent() 191589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 192589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattnertemplate <class X, class Y> 1935a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattnerinline typename cast_retty<X, Y>::ret_type cast(const Y &Val) { 19488d942d8983aadecae477fee523c23312d194515Misha Brukman assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!"); 1955a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner return cast_convert_val<X, Y, 1965a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattner typename simplify_type<Y>::SimpleType>::doit(Val); 197589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner} 198589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 199589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// cast_or_null<X> - Functionally identical to cast, except that a null value is 200589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// accepted. 201589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 202589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattnertemplate <class X, class Y> 2035a6d63ae29512d654c8c697f42f32f97b9dc010bChris Lattnerinline typename cast_retty<X, Y*>::ret_type cast_or_null(Y *Val) { 2047e70829632f82de15db187845666aaca6e04b792Chris Lattner if (Val == 0) return 0; 20588d942d8983aadecae477fee523c23312d194515Misha Brukman assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!"); 2067e70829632f82de15db187845666aaca6e04b792Chris Lattner return cast<X>(Val); 207589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner} 208589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 209589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 210589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// dyn_cast<X> - Return the argument parameter cast to the specified type. This 211589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// casting operator returns null if the argument is of the wrong type, so it can 212589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// be used to test for a type as well as cast if successful. This should be 213589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// used in the context of an if statement like this: 214589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 2151ff1da7ac9bff43ba24445ff30ba2fd79bd95cd7Chris Lattner// if (const Instruction *I = dyn_cast<Instruction>(myVal)) { ... } 216589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 217589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 218589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattnertemplate <class X, class Y> 219ea0f49e52436272c65b52fe1e83f5009aa191a21Chris Lattnerinline typename cast_retty<X, Y>::ret_type dyn_cast(Y Val) { 220ea0f49e52436272c65b52fe1e83f5009aa191a21Chris Lattner return isa<X>(Val) ? cast<X, Y>(Val) : 0; 221589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner} 222589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 223589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// dyn_cast_or_null<X> - Functionally identical to dyn_cast, except that a null 224589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// value is accepted. 225589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner// 226589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattnertemplate <class X, class Y> 2271ff1da7ac9bff43ba24445ff30ba2fd79bd95cd7Chris Lattnerinline typename cast_retty<X, Y>::ret_type dyn_cast_or_null(Y Val) { 2281ff1da7ac9bff43ba24445ff30ba2fd79bd95cd7Chris Lattner return (Val && isa<X>(Val)) ? cast<X, Y>(Val) : 0; 2297e70829632f82de15db187845666aaca6e04b792Chris Lattner} 2307e70829632f82de15db187845666aaca6e04b792Chris Lattner 2317e70829632f82de15db187845666aaca6e04b792Chris Lattner 2327e70829632f82de15db187845666aaca6e04b792Chris Lattner#ifdef DEBUG_CAST_OPERATORS 2337e70829632f82de15db187845666aaca6e04b792Chris Lattner#include <iostream> 2347e70829632f82de15db187845666aaca6e04b792Chris Lattner 2357e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct bar { 2367e70829632f82de15db187845666aaca6e04b792Chris Lattner bar() {} 2377e70829632f82de15db187845666aaca6e04b792Chris Lattnerprivate: 2387e70829632f82de15db187845666aaca6e04b792Chris Lattner bar(const bar &); 2397e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 2407e70829632f82de15db187845666aaca6e04b792Chris Lattnerstruct foo { 2417e70829632f82de15db187845666aaca6e04b792Chris Lattner void ext() const; 2427e70829632f82de15db187845666aaca6e04b792Chris Lattner /* static bool classof(const bar *X) { 2437e70829632f82de15db187845666aaca6e04b792Chris Lattner cerr << "Classof: " << X << "\n"; 2447e70829632f82de15db187845666aaca6e04b792Chris Lattner return true; 2457e70829632f82de15db187845666aaca6e04b792Chris Lattner }*/ 2467e70829632f82de15db187845666aaca6e04b792Chris Lattner}; 2477e70829632f82de15db187845666aaca6e04b792Chris Lattner 2487e70829632f82de15db187845666aaca6e04b792Chris Lattnertemplate <> inline bool isa_impl<foo,bar>(const bar &Val) { 2497e70829632f82de15db187845666aaca6e04b792Chris Lattner cerr << "Classof: " << &Val << "\n"; 2507e70829632f82de15db187845666aaca6e04b792Chris Lattner return true; 2517e70829632f82de15db187845666aaca6e04b792Chris Lattner} 2527e70829632f82de15db187845666aaca6e04b792Chris Lattner 2537e70829632f82de15db187845666aaca6e04b792Chris Lattner 2547e70829632f82de15db187845666aaca6e04b792Chris Lattnerbar *fub(); 2557e70829632f82de15db187845666aaca6e04b792Chris Lattnervoid test(bar &B1, const bar *B2) { 2567e70829632f82de15db187845666aaca6e04b792Chris Lattner // test various configurations of const 2577e70829632f82de15db187845666aaca6e04b792Chris Lattner const bar &B3 = B1; 2587e70829632f82de15db187845666aaca6e04b792Chris Lattner const bar *const B4 = B2; 2597e70829632f82de15db187845666aaca6e04b792Chris Lattner 2607e70829632f82de15db187845666aaca6e04b792Chris Lattner // test isa 2617e70829632f82de15db187845666aaca6e04b792Chris Lattner if (!isa<foo>(B1)) return; 2627e70829632f82de15db187845666aaca6e04b792Chris Lattner if (!isa<foo>(B2)) return; 2637e70829632f82de15db187845666aaca6e04b792Chris Lattner if (!isa<foo>(B3)) return; 2647e70829632f82de15db187845666aaca6e04b792Chris Lattner if (!isa<foo>(B4)) return; 2657e70829632f82de15db187845666aaca6e04b792Chris Lattner 2667e70829632f82de15db187845666aaca6e04b792Chris Lattner // test cast 2677e70829632f82de15db187845666aaca6e04b792Chris Lattner foo &F1 = cast<foo>(B1); 2687e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F3 = cast<foo>(B2); 2697e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F4 = cast<foo>(B2); 2707e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo &F8 = cast<foo>(B3); 2717e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F9 = cast<foo>(B4); 2727e70829632f82de15db187845666aaca6e04b792Chris Lattner foo *F10 = cast<foo>(fub()); 2737e70829632f82de15db187845666aaca6e04b792Chris Lattner 2747e70829632f82de15db187845666aaca6e04b792Chris Lattner // test cast_or_null 2757e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F11 = cast_or_null<foo>(B2); 2767e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F12 = cast_or_null<foo>(B2); 2777e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F13 = cast_or_null<foo>(B4); 2787e70829632f82de15db187845666aaca6e04b792Chris Lattner const foo *F14 = cast_or_null<foo>(fub()); // Shouldn't print. 2797e70829632f82de15db187845666aaca6e04b792Chris Lattner 2807e70829632f82de15db187845666aaca6e04b792Chris Lattner // These lines are errors... 2817e70829632f82de15db187845666aaca6e04b792Chris Lattner //foo *F20 = cast<foo>(B2); // Yields const foo* 2827e70829632f82de15db187845666aaca6e04b792Chris Lattner //foo &F21 = cast<foo>(B3); // Yields const foo& 2837e70829632f82de15db187845666aaca6e04b792Chris Lattner //foo *F22 = cast<foo>(B4); // Yields const foo* 2847e70829632f82de15db187845666aaca6e04b792Chris Lattner //foo &F23 = cast_or_null<foo>(B1); 2857e70829632f82de15db187845666aaca6e04b792Chris Lattner //const foo &F24 = cast_or_null<foo>(B3); 2867e70829632f82de15db187845666aaca6e04b792Chris Lattner} 2877e70829632f82de15db187845666aaca6e04b792Chris Lattner 2887e70829632f82de15db187845666aaca6e04b792Chris Lattnerbar *fub() { return 0; } 2897e70829632f82de15db187845666aaca6e04b792Chris Lattnervoid main() { 2907e70829632f82de15db187845666aaca6e04b792Chris Lattner bar B; 2917e70829632f82de15db187845666aaca6e04b792Chris Lattner test(B, &B); 292589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner} 293589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner 294589df88ba03a81b2b3dc9d084c191a3a74724ecdChris Lattner#endif 2957e70829632f82de15db187845666aaca6e04b792Chris Lattner 2967e70829632f82de15db187845666aaca6e04b792Chris Lattner#endif 297