Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 1 | //===--- CGVTables.cpp - Emit LLVM Code for C++ vtables -------------------===// |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 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 contains code dealing with C++ code generation of virtual tables. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenModule.h" |
| 15 | #include "CodeGenFunction.h" |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 16 | #include "clang/AST/CXXInheritance.h" |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 17 | #include "clang/AST/RecordLayout.h" |
Anders Carlsson | 5dd730a | 2009-11-26 19:32:45 +0000 | [diff] [blame] | 18 | #include "llvm/ADT/DenseSet.h" |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 19 | #include "llvm/ADT/SetVector.h" |
Chandler Carruth | e087f07 | 2010-02-13 10:38:52 +0000 | [diff] [blame] | 20 | #include "llvm/Support/Compiler.h" |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 21 | #include "llvm/Support/Format.h" |
Anders Carlsson | 5e454aa | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 22 | #include <algorithm> |
Zhongxing Xu | 7fe26ac | 2009-11-13 05:46:16 +0000 | [diff] [blame] | 23 | #include <cstdio> |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 24 | |
| 25 | using namespace clang; |
| 26 | using namespace CodeGen; |
| 27 | |
Anders Carlsson | 27f69d0 | 2009-11-27 22:21:51 +0000 | [diff] [blame] | 28 | namespace { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 29 | |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 30 | /// BaseOffset - Represents an offset from a derived class to a direct or |
| 31 | /// indirect base class. |
| 32 | struct BaseOffset { |
| 33 | /// DerivedClass - The derived class. |
| 34 | const CXXRecordDecl *DerivedClass; |
| 35 | |
| 36 | /// VirtualBase - If the path from the derived class to the base class |
| 37 | /// involves a virtual base class, this holds its declaration. |
| 38 | const CXXRecordDecl *VirtualBase; |
| 39 | |
| 40 | /// NonVirtualOffset - The offset from the derived class to the base class. |
| 41 | /// (Or the offset from the virtual base class to the base class, if the |
| 42 | /// path from the derived class to the base class involves a virtual base |
| 43 | /// class. |
| 44 | int64_t NonVirtualOffset; |
| 45 | |
| 46 | BaseOffset() : DerivedClass(0), VirtualBase(0), NonVirtualOffset(0) { } |
| 47 | BaseOffset(const CXXRecordDecl *DerivedClass, |
| 48 | const CXXRecordDecl *VirtualBase, int64_t NonVirtualOffset) |
| 49 | : DerivedClass(DerivedClass), VirtualBase(VirtualBase), |
| 50 | NonVirtualOffset(NonVirtualOffset) { } |
| 51 | |
| 52 | bool isEmpty() const { return !NonVirtualOffset && !VirtualBase; } |
| 53 | }; |
| 54 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 55 | /// FinalOverriders - Contains the final overrider member functions for all |
| 56 | /// member functions in the base subobjects of a class. |
| 57 | class FinalOverriders { |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 58 | public: |
| 59 | /// OverriderInfo - Information about a final overrider. |
| 60 | struct OverriderInfo { |
| 61 | /// Method - The method decl of the overrider. |
| 62 | const CXXMethodDecl *Method; |
Anders Carlsson | 96309c4 | 2010-02-18 16:29:24 +0000 | [diff] [blame] | 63 | |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 64 | /// Offset - the base offset of the overrider in the layout class. |
| 65 | uint64_t Offset; |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 66 | |
Anders Carlsson | cd0d27f | 2010-03-12 05:02:01 +0000 | [diff] [blame] | 67 | OverriderInfo() : Method(0), Offset(0) { } |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 68 | }; |
| 69 | |
| 70 | private: |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 71 | /// MostDerivedClass - The most derived class for which the final overriders |
| 72 | /// are stored. |
| 73 | const CXXRecordDecl *MostDerivedClass; |
| 74 | |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 75 | /// MostDerivedClassOffset - If we're building final overriders for a |
| 76 | /// construction vtable, this holds the offset from the layout class to the |
| 77 | /// most derived class. |
| 78 | const uint64_t MostDerivedClassOffset; |
| 79 | |
| 80 | /// LayoutClass - The class we're using for layout information. Will be |
| 81 | /// different than the most derived class if the final overriders are for a |
| 82 | /// construction vtable. |
| 83 | const CXXRecordDecl *LayoutClass; |
| 84 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 85 | ASTContext &Context; |
| 86 | |
| 87 | /// MostDerivedClassLayout - the AST record layout of the most derived class. |
| 88 | const ASTRecordLayout &MostDerivedClassLayout; |
| 89 | |
Anders Carlsson | 0a02860 | 2010-06-01 23:52:26 +0000 | [diff] [blame^] | 90 | /// MethodBaseOffsetPairTy - Uniquely identifies a member function |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 91 | /// in a base subobject. |
Anders Carlsson | 0a02860 | 2010-06-01 23:52:26 +0000 | [diff] [blame^] | 92 | typedef std::pair<const CXXMethodDecl *, uint64_t> MethodBaseOffsetPairTy; |
| 93 | |
| 94 | typedef llvm::DenseMap<MethodBaseOffsetPairTy, |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 95 | OverriderInfo> OverridersMapTy; |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 96 | |
| 97 | /// OverridersMap - The final overriders for all virtual member functions of |
| 98 | /// all the base subobjects of the most derived class. |
| 99 | OverridersMapTy OverridersMap; |
| 100 | |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 101 | /// VisitedVirtualBases - A set of all the visited virtual bases, used to |
| 102 | /// avoid visiting virtual bases more than once. |
| 103 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBases; |
| 104 | |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 105 | // FIXME: We might be able to get away with making this a SmallSet. |
| 106 | typedef llvm::SmallSetVector<uint64_t, 2> OffsetSetVectorTy; |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 107 | |
| 108 | /// SubobjectOffsetsMapTy - This map is used for keeping track of all the |
| 109 | /// base subobject offsets that a single class declaration might refer to. |
| 110 | /// |
| 111 | /// For example, in: |
| 112 | /// |
| 113 | /// struct A { virtual void f(); }; |
| 114 | /// struct B1 : A { }; |
| 115 | /// struct B2 : A { }; |
| 116 | /// struct C : B1, B2 { virtual void f(); }; |
| 117 | /// |
| 118 | /// when we determine that C::f() overrides A::f(), we need to update the |
| 119 | /// overriders map for both A-in-B1 and A-in-B2 and the subobject offsets map |
| 120 | /// will have the subobject offsets for both A copies. |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 121 | typedef llvm::DenseMap<const CXXRecordDecl *, OffsetSetVectorTy> |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 122 | SubobjectOffsetsMapTy; |
| 123 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 124 | /// ComputeFinalOverriders - Compute the final overriders for a given base |
| 125 | /// subobject (and all its direct and indirect bases). |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 126 | void ComputeFinalOverriders(BaseSubobject Base, |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 127 | bool BaseSubobjectIsVisitedVBase, |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 128 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 129 | SubobjectOffsetsMapTy &Offsets); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 130 | |
| 131 | /// AddOverriders - Add the final overriders for this base subobject to the |
| 132 | /// map of final overriders. |
Anders Carlsson | c1246c8 | 2010-03-26 00:35:45 +0000 | [diff] [blame] | 133 | void AddOverriders(BaseSubobject Base, uint64_t OffsetInLayoutClass, |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 134 | SubobjectOffsetsMapTy &Offsets); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 135 | |
| 136 | /// PropagateOverrider - Propagate the NewMD overrider to all the functions |
| 137 | /// that OldMD overrides. For example, if we have: |
| 138 | /// |
| 139 | /// struct A { virtual void f(); }; |
| 140 | /// struct B : A { virtual void f(); }; |
| 141 | /// struct C : B { virtual void f(); }; |
| 142 | /// |
| 143 | /// and we want to override B::f with C::f, we also need to override A::f with |
| 144 | /// C::f. |
| 145 | void PropagateOverrider(const CXXMethodDecl *OldMD, |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 146 | uint64_t OverriderOffsetInLayoutClass, |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 147 | const CXXMethodDecl *NewMD, |
| 148 | SubobjectOffsetsMapTy &Offsets); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 149 | |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 150 | static void MergeSubobjectOffsets(const SubobjectOffsetsMapTy &NewOffsets, |
| 151 | SubobjectOffsetsMapTy &Offsets); |
| 152 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 153 | public: |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 154 | FinalOverriders(const CXXRecordDecl *MostDerivedClass, |
| 155 | uint64_t MostDerivedClassOffset, |
| 156 | const CXXRecordDecl *LayoutClass); |
Anders Carlsson | 2157d30 | 2010-02-24 22:18:01 +0000 | [diff] [blame] | 157 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 158 | /// getOverrider - Get the final overrider for the given method declaration in |
Anders Carlsson | 2638764 | 2010-06-01 23:17:37 +0000 | [diff] [blame] | 159 | /// the subobject with the given base offset. |
| 160 | OverriderInfo getOverrider(const CXXMethodDecl *MD, |
| 161 | uint64_t BaseOffset) const { |
Anders Carlsson | 0a02860 | 2010-06-01 23:52:26 +0000 | [diff] [blame^] | 162 | assert(OverridersMap.count(std::make_pair(MD, BaseOffset)) && |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 163 | "Did not find overrider!"); |
| 164 | |
Anders Carlsson | 0a02860 | 2010-06-01 23:52:26 +0000 | [diff] [blame^] | 165 | return OverridersMap.lookup(std::make_pair(MD, BaseOffset)); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | /// dump - dump the final overriders. |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 169 | void dump() { |
| 170 | assert(VisitedVirtualBases.empty() && |
| 171 | "Visited virtual bases aren't empty!"); |
| 172 | dump(llvm::errs(), BaseSubobject(MostDerivedClass, 0)); |
| 173 | VisitedVirtualBases.clear(); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | /// dump - dump the final overriders for a base subobject, and all its direct |
| 177 | /// and indirect base subobjects. |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 178 | void dump(llvm::raw_ostream &Out, BaseSubobject Base); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 179 | }; |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 180 | |
Anders Carlsson | 327568e | 2010-02-27 20:02:53 +0000 | [diff] [blame] | 181 | #define DUMP_OVERRIDERS 0 |
| 182 | |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 183 | FinalOverriders::FinalOverriders(const CXXRecordDecl *MostDerivedClass, |
| 184 | uint64_t MostDerivedClassOffset, |
| 185 | const CXXRecordDecl *LayoutClass) |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 186 | : MostDerivedClass(MostDerivedClass), |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 187 | MostDerivedClassOffset(MostDerivedClassOffset), LayoutClass(LayoutClass), |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 188 | Context(MostDerivedClass->getASTContext()), |
| 189 | MostDerivedClassLayout(Context.getASTRecordLayout(MostDerivedClass)) { |
| 190 | |
| 191 | // Compute the final overriders. |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 192 | SubobjectOffsetsMapTy Offsets; |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 193 | ComputeFinalOverriders(BaseSubobject(MostDerivedClass, 0), |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 194 | /*BaseSubobjectIsVisitedVBase=*/false, |
| 195 | MostDerivedClassOffset, Offsets); |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 196 | VisitedVirtualBases.clear(); |
Anders Carlsson | 327568e | 2010-02-27 20:02:53 +0000 | [diff] [blame] | 197 | |
| 198 | #if DUMP_OVERRIDERS |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 199 | // And dump them (for now). |
| 200 | dump(); |
Anders Carlsson | a469988 | 2010-02-13 21:33:22 +0000 | [diff] [blame] | 201 | |
| 202 | // Also dump the base offsets (for now). |
| 203 | for (SubobjectOffsetsMapTy::const_iterator I = Offsets.begin(), |
| 204 | E = Offsets.end(); I != E; ++I) { |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 205 | const OffsetSetVectorTy& OffsetSetVector = I->second; |
Anders Carlsson | a469988 | 2010-02-13 21:33:22 +0000 | [diff] [blame] | 206 | |
| 207 | llvm::errs() << "Base offsets for "; |
| 208 | llvm::errs() << I->first->getQualifiedNameAsString() << '\n'; |
| 209 | |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 210 | for (unsigned I = 0, E = OffsetSetVector.size(); I != E; ++I) |
| 211 | llvm::errs() << " " << I << " - " << OffsetSetVector[I] / 8 << '\n'; |
Anders Carlsson | a469988 | 2010-02-13 21:33:22 +0000 | [diff] [blame] | 212 | } |
Anders Carlsson | 327568e | 2010-02-27 20:02:53 +0000 | [diff] [blame] | 213 | #endif |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 214 | } |
| 215 | |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 216 | void FinalOverriders::AddOverriders(BaseSubobject Base, |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 217 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 218 | SubobjectOffsetsMapTy &Offsets) { |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 219 | const CXXRecordDecl *RD = Base.getBase(); |
| 220 | |
| 221 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 222 | E = RD->method_end(); I != E; ++I) { |
| 223 | const CXXMethodDecl *MD = *I; |
| 224 | |
| 225 | if (!MD->isVirtual()) |
| 226 | continue; |
| 227 | |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 228 | // First, propagate the overrider. |
Anders Carlsson | 8be373b | 2010-05-30 18:23:41 +0000 | [diff] [blame] | 229 | PropagateOverrider(MD, OffsetInLayoutClass, MD, Offsets); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 230 | |
| 231 | // Add the overrider as the final overrider of itself. |
Anders Carlsson | 0a02860 | 2010-06-01 23:52:26 +0000 | [diff] [blame^] | 232 | OverriderInfo& Overrider = |
| 233 | OverridersMap[std::make_pair(MD, Base.getBaseOffset())]; |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 234 | assert(!Overrider.Method && "Overrider should not exist yet!"); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 235 | |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 236 | Overrider.Offset = OffsetInLayoutClass; |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 237 | Overrider.Method = MD; |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 238 | } |
| 239 | } |
| 240 | |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 241 | static BaseOffset ComputeBaseOffset(ASTContext &Context, |
| 242 | const CXXRecordDecl *DerivedRD, |
| 243 | const CXXBasePath &Path) { |
Anders Carlsson | df31af1 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 244 | int64_t NonVirtualOffset = 0; |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 245 | |
Anders Carlsson | a4a5417 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 246 | unsigned NonVirtualStart = 0; |
| 247 | const CXXRecordDecl *VirtualBase = 0; |
| 248 | |
| 249 | // First, look for the virtual base class. |
| 250 | for (unsigned I = 0, E = Path.size(); I != E; ++I) { |
| 251 | const CXXBasePathElement &Element = Path[I]; |
| 252 | |
| 253 | if (Element.Base->isVirtual()) { |
| 254 | // FIXME: Can we break when we find the first virtual base? |
| 255 | // (If we can't, can't we just iterate over the path in reverse order?) |
| 256 | NonVirtualStart = I + 1; |
| 257 | QualType VBaseType = Element.Base->getType(); |
| 258 | VirtualBase = |
| 259 | cast<CXXRecordDecl>(VBaseType->getAs<RecordType>()->getDecl()); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | // Now compute the non-virtual offset. |
| 264 | for (unsigned I = NonVirtualStart, E = Path.size(); I != E; ++I) { |
| 265 | const CXXBasePathElement &Element = Path[I]; |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 266 | |
| 267 | // Check the base class offset. |
| 268 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(Element.Class); |
Anders Carlsson | bf554f6 | 2010-02-25 22:18:35 +0000 | [diff] [blame] | 269 | |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 270 | const RecordType *BaseType = Element.Base->getType()->getAs<RecordType>(); |
| 271 | const CXXRecordDecl *Base = cast<CXXRecordDecl>(BaseType->getDecl()); |
Anders Carlsson | bf554f6 | 2010-02-25 22:18:35 +0000 | [diff] [blame] | 272 | |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 273 | NonVirtualOffset += Layout.getBaseClassOffset(Base); |
| 274 | } |
| 275 | |
| 276 | // FIXME: This should probably use CharUnits or something. Maybe we should |
| 277 | // even change the base offsets in ASTRecordLayout to be specified in |
| 278 | // CharUnits. |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 279 | return BaseOffset(DerivedRD, VirtualBase, NonVirtualOffset / 8); |
Anders Carlsson | e67dc30 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 280 | |
| 281 | } |
| 282 | |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 283 | static BaseOffset ComputeBaseOffset(ASTContext &Context, |
| 284 | const CXXRecordDecl *BaseRD, |
| 285 | const CXXRecordDecl *DerivedRD) { |
Anders Carlsson | e67dc30 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 286 | CXXBasePaths Paths(/*FindAmbiguities=*/false, |
| 287 | /*RecordPaths=*/true, /*DetectVirtual=*/false); |
| 288 | |
| 289 | if (!const_cast<CXXRecordDecl *>(DerivedRD)-> |
| 290 | isDerivedFrom(const_cast<CXXRecordDecl *>(BaseRD), Paths)) { |
| 291 | assert(false && "Class must be derived from the passed in base class!"); |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 292 | return BaseOffset(); |
Anders Carlsson | e67dc30 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | return ComputeBaseOffset(Context, DerivedRD, Paths.front()); |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 296 | } |
| 297 | |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 298 | static BaseOffset |
Anders Carlsson | df31af1 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 299 | ComputeReturnAdjustmentBaseOffset(ASTContext &Context, |
| 300 | const CXXMethodDecl *DerivedMD, |
| 301 | const CXXMethodDecl *BaseMD) { |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 302 | const FunctionType *BaseFT = BaseMD->getType()->getAs<FunctionType>(); |
| 303 | const FunctionType *DerivedFT = DerivedMD->getType()->getAs<FunctionType>(); |
| 304 | |
| 305 | // Canonicalize the return types. |
| 306 | CanQualType CanDerivedReturnType = |
| 307 | Context.getCanonicalType(DerivedFT->getResultType()); |
| 308 | CanQualType CanBaseReturnType = |
| 309 | Context.getCanonicalType(BaseFT->getResultType()); |
| 310 | |
| 311 | assert(CanDerivedReturnType->getTypeClass() == |
| 312 | CanBaseReturnType->getTypeClass() && |
| 313 | "Types must have same type class!"); |
| 314 | |
| 315 | if (CanDerivedReturnType == CanBaseReturnType) { |
| 316 | // No adjustment needed. |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 317 | return BaseOffset(); |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | if (isa<ReferenceType>(CanDerivedReturnType)) { |
| 321 | CanDerivedReturnType = |
| 322 | CanDerivedReturnType->getAs<ReferenceType>()->getPointeeType(); |
| 323 | CanBaseReturnType = |
| 324 | CanBaseReturnType->getAs<ReferenceType>()->getPointeeType(); |
| 325 | } else if (isa<PointerType>(CanDerivedReturnType)) { |
| 326 | CanDerivedReturnType = |
| 327 | CanDerivedReturnType->getAs<PointerType>()->getPointeeType(); |
| 328 | CanBaseReturnType = |
| 329 | CanBaseReturnType->getAs<PointerType>()->getPointeeType(); |
| 330 | } else { |
| 331 | assert(false && "Unexpected return type!"); |
| 332 | } |
| 333 | |
| 334 | // We need to compare unqualified types here; consider |
| 335 | // const T *Base::foo(); |
| 336 | // T *Derived::foo(); |
| 337 | if (CanDerivedReturnType.getUnqualifiedType() == |
| 338 | CanBaseReturnType.getUnqualifiedType()) { |
| 339 | // No adjustment needed. |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 340 | return BaseOffset(); |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | const CXXRecordDecl *DerivedRD = |
| 344 | cast<CXXRecordDecl>(cast<RecordType>(CanDerivedReturnType)->getDecl()); |
| 345 | |
| 346 | const CXXRecordDecl *BaseRD = |
| 347 | cast<CXXRecordDecl>(cast<RecordType>(CanBaseReturnType)->getDecl()); |
| 348 | |
Anders Carlsson | df31af1 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 349 | return ComputeBaseOffset(Context, BaseRD, DerivedRD); |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 350 | } |
| 351 | |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 352 | void FinalOverriders::PropagateOverrider(const CXXMethodDecl *OldMD, |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 353 | uint64_t OverriderOffsetInLayoutClass, |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 354 | const CXXMethodDecl *NewMD, |
| 355 | SubobjectOffsetsMapTy &Offsets) { |
| 356 | for (CXXMethodDecl::method_iterator I = OldMD->begin_overridden_methods(), |
| 357 | E = OldMD->end_overridden_methods(); I != E; ++I) { |
| 358 | const CXXMethodDecl *OverriddenMD = *I; |
| 359 | const CXXRecordDecl *OverriddenRD = OverriddenMD->getParent(); |
| 360 | |
| 361 | // We want to override OverriddenMD in all subobjects, for example: |
| 362 | // |
| 363 | /// struct A { virtual void f(); }; |
| 364 | /// struct B1 : A { }; |
| 365 | /// struct B2 : A { }; |
| 366 | /// struct C : B1, B2 { virtual void f(); }; |
| 367 | /// |
| 368 | /// When overriding A::f with C::f we need to do so in both A subobjects. |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 369 | const OffsetSetVectorTy &OffsetVector = Offsets[OverriddenRD]; |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 370 | |
| 371 | // Go through all the subobjects. |
| 372 | for (unsigned I = 0, E = OffsetVector.size(); I != E; ++I) { |
| 373 | uint64_t Offset = OffsetVector[I]; |
| 374 | |
Anders Carlsson | 0a02860 | 2010-06-01 23:52:26 +0000 | [diff] [blame^] | 375 | MethodBaseOffsetPairTy MethodAndBaseOffset(OverriddenMD, Offset); |
| 376 | OverriderInfo &Overrider = OverridersMap[MethodAndBaseOffset]; |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 377 | |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 378 | assert(Overrider.Method && "Did not find existing overrider!"); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 379 | |
| 380 | // Set the new overrider. |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 381 | Overrider.Offset = OverriderOffsetInLayoutClass; |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 382 | Overrider.Method = NewMD; |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 383 | |
| 384 | // And propagate it further. |
Anders Carlsson | 8be373b | 2010-05-30 18:23:41 +0000 | [diff] [blame] | 385 | PropagateOverrider(OverriddenMD, OverriderOffsetInLayoutClass, NewMD, |
| 386 | Offsets); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 387 | } |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | void |
| 392 | FinalOverriders::MergeSubobjectOffsets(const SubobjectOffsetsMapTy &NewOffsets, |
| 393 | SubobjectOffsetsMapTy &Offsets) { |
| 394 | // Iterate over the new offsets. |
| 395 | for (SubobjectOffsetsMapTy::const_iterator I = NewOffsets.begin(), |
| 396 | E = NewOffsets.end(); I != E; ++I) { |
| 397 | const CXXRecordDecl *NewRD = I->first; |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 398 | const OffsetSetVectorTy& NewOffsetVector = I->second; |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 399 | |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 400 | OffsetSetVectorTy &OffsetVector = Offsets[NewRD]; |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 401 | |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 402 | // Merge the new offsets set vector into the old. |
| 403 | OffsetVector.insert(NewOffsetVector.begin(), NewOffsetVector.end()); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 404 | } |
| 405 | } |
| 406 | |
| 407 | void FinalOverriders::ComputeFinalOverriders(BaseSubobject Base, |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 408 | bool BaseSubobjectIsVisitedVBase, |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 409 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 410 | SubobjectOffsetsMapTy &Offsets) { |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 411 | const CXXRecordDecl *RD = Base.getBase(); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 412 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 413 | |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 414 | SubobjectOffsetsMapTy NewOffsets; |
| 415 | |
| 416 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 417 | E = RD->bases_end(); I != E; ++I) { |
| 418 | const CXXRecordDecl *BaseDecl = |
| 419 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 420 | |
Anders Carlsson | b828afa | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 421 | // Ignore bases that don't have any virtual member functions. |
| 422 | if (!BaseDecl->isPolymorphic()) |
| 423 | continue; |
| 424 | |
Anders Carlsson | bf554f6 | 2010-02-25 22:18:35 +0000 | [diff] [blame] | 425 | bool IsVisitedVirtualBase = BaseSubobjectIsVisitedVBase; |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 426 | uint64_t BaseOffset; |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 427 | uint64_t BaseOffsetInLayoutClass; |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 428 | if (I->isVirtual()) { |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 429 | if (!VisitedVirtualBases.insert(BaseDecl)) |
| 430 | IsVisitedVirtualBase = true; |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 431 | BaseOffset = MostDerivedClassLayout.getVBaseClassOffset(BaseDecl); |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 432 | |
| 433 | const ASTRecordLayout &LayoutClassLayout = |
| 434 | Context.getASTRecordLayout(LayoutClass); |
| 435 | BaseOffsetInLayoutClass = |
| 436 | LayoutClassLayout.getVBaseClassOffset(BaseDecl); |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 437 | } else { |
| 438 | BaseOffset = Layout.getBaseClassOffset(BaseDecl) + Base.getBaseOffset(); |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 439 | BaseOffsetInLayoutClass = Layout.getBaseClassOffset(BaseDecl) + |
| 440 | OffsetInLayoutClass; |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 441 | } |
| 442 | |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 443 | // Compute the final overriders for this base. |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 444 | // We always want to compute the final overriders, even if the base is a |
| 445 | // visited virtual base. Consider: |
| 446 | // |
| 447 | // struct A { |
| 448 | // virtual void f(); |
| 449 | // virtual void g(); |
| 450 | // }; |
| 451 | // |
| 452 | // struct B : virtual A { |
| 453 | // void f(); |
| 454 | // }; |
| 455 | // |
| 456 | // struct C : virtual A { |
| 457 | // void g (); |
| 458 | // }; |
| 459 | // |
| 460 | // struct D : B, C { }; |
| 461 | // |
| 462 | // Here, we still want to compute the overriders for A as a base of C, |
| 463 | // because otherwise we'll miss that C::g overrides A::f. |
| 464 | ComputeFinalOverriders(BaseSubobject(BaseDecl, BaseOffset), |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 465 | IsVisitedVirtualBase, BaseOffsetInLayoutClass, |
| 466 | NewOffsets); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | /// Now add the overriders for this particular subobject. |
Anders Carlsson | d5c7cca | 2010-02-17 17:48:25 +0000 | [diff] [blame] | 470 | /// (We don't want to do this more than once for a virtual base). |
| 471 | if (!BaseSubobjectIsVisitedVBase) |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 472 | AddOverriders(Base, OffsetInLayoutClass, NewOffsets); |
Anders Carlsson | b8358d8 | 2010-02-12 01:40:03 +0000 | [diff] [blame] | 473 | |
| 474 | // And merge the newly discovered subobject offsets. |
| 475 | MergeSubobjectOffsets(NewOffsets, Offsets); |
| 476 | |
| 477 | /// Finally, add the offset for our own subobject. |
Anders Carlsson | ce57dd5 | 2010-03-03 04:58:02 +0000 | [diff] [blame] | 478 | Offsets[RD].insert(Base.getBaseOffset()); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 479 | } |
| 480 | |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 481 | void FinalOverriders::dump(llvm::raw_ostream &Out, BaseSubobject Base) { |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 482 | const CXXRecordDecl *RD = Base.getBase(); |
| 483 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 484 | |
| 485 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 486 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 487 | const CXXRecordDecl *BaseDecl = |
| 488 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 489 | |
Anders Carlsson | b828afa | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 490 | // Ignore bases that don't have any virtual member functions. |
| 491 | if (!BaseDecl->isPolymorphic()) |
| 492 | continue; |
| 493 | |
Anders Carlsson | 9d6f0d5 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 494 | uint64_t BaseOffset; |
| 495 | if (I->isVirtual()) { |
| 496 | if (!VisitedVirtualBases.insert(BaseDecl)) { |
| 497 | // We've visited this base before. |
| 498 | continue; |
| 499 | } |
| 500 | |
| 501 | BaseOffset = MostDerivedClassLayout.getVBaseClassOffset(BaseDecl); |
| 502 | } else { |
| 503 | BaseOffset = Layout.getBaseClassOffset(BaseDecl) + |
| 504 | Base.getBaseOffset(); |
| 505 | } |
| 506 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 507 | dump(Out, BaseSubobject(BaseDecl, BaseOffset)); |
| 508 | } |
| 509 | |
| 510 | Out << "Final overriders for (" << RD->getQualifiedNameAsString() << ", "; |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 511 | Out << Base.getBaseOffset() / 8 << ")\n"; |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 512 | |
| 513 | // Now dump the overriders for this base subobject. |
| 514 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 515 | E = RD->method_end(); I != E; ++I) { |
| 516 | const CXXMethodDecl *MD = *I; |
| 517 | |
| 518 | if (!MD->isVirtual()) |
| 519 | continue; |
| 520 | |
Anders Carlsson | 2638764 | 2010-06-01 23:17:37 +0000 | [diff] [blame] | 521 | OverriderInfo Overrider = getOverrider(MD, Base.getBaseOffset()); |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 522 | |
Anders Carlsson | d86e5d8 | 2010-03-02 03:44:06 +0000 | [diff] [blame] | 523 | Out << " " << MD->getQualifiedNameAsString() << " - ("; |
Anders Carlsson | 16b7312 | 2010-02-12 17:13:23 +0000 | [diff] [blame] | 524 | Out << Overrider.Method->getQualifiedNameAsString(); |
Anders Carlsson | cd0d27f | 2010-03-12 05:02:01 +0000 | [diff] [blame] | 525 | Out << ", " << ", " << Overrider.Offset / 8 << ')'; |
Anders Carlsson | d86e5d8 | 2010-03-02 03:44:06 +0000 | [diff] [blame] | 526 | |
Anders Carlsson | 7097e75 | 2010-06-01 23:47:05 +0000 | [diff] [blame] | 527 | BaseOffset Offset; |
| 528 | if (!Overrider.Method->isPure()) |
| 529 | Offset = ComputeReturnAdjustmentBaseOffset(Context, Overrider.Method, MD); |
Anders Carlsson | a4a5417 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 530 | |
Anders Carlsson | 7097e75 | 2010-06-01 23:47:05 +0000 | [diff] [blame] | 531 | if (!Offset.isEmpty()) { |
Anders Carlsson | a4a5417 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 532 | Out << " [ret-adj: "; |
| 533 | if (Offset.VirtualBase) |
| 534 | Out << Offset.VirtualBase->getQualifiedNameAsString() << " vbase, "; |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 535 | |
Anders Carlsson | a4a5417 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 536 | Out << Offset.NonVirtualOffset << " nv]"; |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 537 | } |
Anders Carlsson | df31af1 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 538 | |
Anders Carlsson | 16b7312 | 2010-02-12 17:13:23 +0000 | [diff] [blame] | 539 | Out << "\n"; |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 540 | } |
| 541 | } |
| 542 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 543 | /// VTableComponent - Represents a single component in a vtable. |
| 544 | class VTableComponent { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 545 | public: |
| 546 | enum Kind { |
| 547 | CK_VCallOffset, |
| 548 | CK_VBaseOffset, |
| 549 | CK_OffsetToTop, |
| 550 | CK_RTTI, |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 551 | CK_FunctionPointer, |
| 552 | |
| 553 | /// CK_CompleteDtorPointer - A pointer to the complete destructor. |
| 554 | CK_CompleteDtorPointer, |
| 555 | |
| 556 | /// CK_DeletingDtorPointer - A pointer to the deleting destructor. |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 557 | CK_DeletingDtorPointer, |
| 558 | |
| 559 | /// CK_UnusedFunctionPointer - In some cases, a vtable function pointer |
| 560 | /// will end up never being called. Such vtable function pointers are |
| 561 | /// represented as a CK_UnusedFunctionPointer. |
| 562 | CK_UnusedFunctionPointer |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 563 | }; |
| 564 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 565 | static VTableComponent MakeVCallOffset(int64_t Offset) { |
| 566 | return VTableComponent(CK_VCallOffset, Offset); |
Anders Carlsson | d9a6704 | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 567 | } |
| 568 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 569 | static VTableComponent MakeVBaseOffset(int64_t Offset) { |
| 570 | return VTableComponent(CK_VBaseOffset, Offset); |
Anders Carlsson | a661a54 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 571 | } |
| 572 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 573 | static VTableComponent MakeOffsetToTop(int64_t Offset) { |
| 574 | return VTableComponent(CK_OffsetToTop, Offset); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 575 | } |
| 576 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 577 | static VTableComponent MakeRTTI(const CXXRecordDecl *RD) { |
| 578 | return VTableComponent(CK_RTTI, reinterpret_cast<uintptr_t>(RD)); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 579 | } |
| 580 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 581 | static VTableComponent MakeFunction(const CXXMethodDecl *MD) { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 582 | assert(!isa<CXXDestructorDecl>(MD) && |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 583 | "Don't use MakeFunction with destructors!"); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 584 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 585 | return VTableComponent(CK_FunctionPointer, |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 586 | reinterpret_cast<uintptr_t>(MD)); |
| 587 | } |
| 588 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 589 | static VTableComponent MakeCompleteDtor(const CXXDestructorDecl *DD) { |
| 590 | return VTableComponent(CK_CompleteDtorPointer, |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 591 | reinterpret_cast<uintptr_t>(DD)); |
| 592 | } |
| 593 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 594 | static VTableComponent MakeDeletingDtor(const CXXDestructorDecl *DD) { |
| 595 | return VTableComponent(CK_DeletingDtorPointer, |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 596 | reinterpret_cast<uintptr_t>(DD)); |
| 597 | } |
| 598 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 599 | static VTableComponent MakeUnusedFunction(const CXXMethodDecl *MD) { |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 600 | assert(!isa<CXXDestructorDecl>(MD) && |
| 601 | "Don't use MakeUnusedFunction with destructors!"); |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 602 | return VTableComponent(CK_UnusedFunctionPointer, |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 603 | reinterpret_cast<uintptr_t>(MD)); |
| 604 | } |
| 605 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 606 | static VTableComponent getFromOpaqueInteger(uint64_t I) { |
| 607 | return VTableComponent(I); |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 608 | } |
| 609 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 610 | /// getKind - Get the kind of this vtable component. |
| 611 | Kind getKind() const { |
| 612 | return (Kind)(Value & 0x7); |
| 613 | } |
| 614 | |
Anders Carlsson | d9a6704 | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 615 | int64_t getVCallOffset() const { |
| 616 | assert(getKind() == CK_VCallOffset && "Invalid component kind!"); |
| 617 | |
| 618 | return getOffset(); |
| 619 | } |
| 620 | |
Anders Carlsson | a661a54 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 621 | int64_t getVBaseOffset() const { |
| 622 | assert(getKind() == CK_VBaseOffset && "Invalid component kind!"); |
| 623 | |
| 624 | return getOffset(); |
| 625 | } |
| 626 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 627 | int64_t getOffsetToTop() const { |
| 628 | assert(getKind() == CK_OffsetToTop && "Invalid component kind!"); |
| 629 | |
| 630 | return getOffset(); |
| 631 | } |
| 632 | |
| 633 | const CXXRecordDecl *getRTTIDecl() const { |
| 634 | assert(getKind() == CK_RTTI && "Invalid component kind!"); |
| 635 | |
| 636 | return reinterpret_cast<CXXRecordDecl *>(getPointer()); |
| 637 | } |
| 638 | |
| 639 | const CXXMethodDecl *getFunctionDecl() const { |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 640 | assert(getKind() == CK_FunctionPointer); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 641 | |
| 642 | return reinterpret_cast<CXXMethodDecl *>(getPointer()); |
| 643 | } |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 644 | |
| 645 | const CXXDestructorDecl *getDestructorDecl() const { |
| 646 | assert((getKind() == CK_CompleteDtorPointer || |
| 647 | getKind() == CK_DeletingDtorPointer) && "Invalid component kind!"); |
| 648 | |
| 649 | return reinterpret_cast<CXXDestructorDecl *>(getPointer()); |
| 650 | } |
| 651 | |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 652 | const CXXMethodDecl *getUnusedFunctionDecl() const { |
| 653 | assert(getKind() == CK_UnusedFunctionPointer); |
| 654 | |
| 655 | return reinterpret_cast<CXXMethodDecl *>(getPointer()); |
| 656 | } |
| 657 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 658 | private: |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 659 | VTableComponent(Kind ComponentKind, int64_t Offset) { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 660 | assert((ComponentKind == CK_VCallOffset || |
| 661 | ComponentKind == CK_VBaseOffset || |
| 662 | ComponentKind == CK_OffsetToTop) && "Invalid component kind!"); |
| 663 | assert(Offset <= ((1LL << 56) - 1) && "Offset is too big!"); |
| 664 | |
| 665 | Value = ((Offset << 3) | ComponentKind); |
| 666 | } |
| 667 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 668 | VTableComponent(Kind ComponentKind, uintptr_t Ptr) { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 669 | assert((ComponentKind == CK_RTTI || |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 670 | ComponentKind == CK_FunctionPointer || |
| 671 | ComponentKind == CK_CompleteDtorPointer || |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 672 | ComponentKind == CK_DeletingDtorPointer || |
| 673 | ComponentKind == CK_UnusedFunctionPointer) && |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 674 | "Invalid component kind!"); |
| 675 | |
| 676 | assert((Ptr & 7) == 0 && "Pointer not sufficiently aligned!"); |
| 677 | |
| 678 | Value = Ptr | ComponentKind; |
| 679 | } |
| 680 | |
| 681 | int64_t getOffset() const { |
| 682 | assert((getKind() == CK_VCallOffset || getKind() == CK_VBaseOffset || |
| 683 | getKind() == CK_OffsetToTop) && "Invalid component kind!"); |
| 684 | |
| 685 | return Value >> 3; |
| 686 | } |
| 687 | |
| 688 | uintptr_t getPointer() const { |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 689 | assert((getKind() == CK_RTTI || |
| 690 | getKind() == CK_FunctionPointer || |
| 691 | getKind() == CK_CompleteDtorPointer || |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 692 | getKind() == CK_DeletingDtorPointer || |
| 693 | getKind() == CK_UnusedFunctionPointer) && |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 694 | "Invalid component kind!"); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 695 | |
| 696 | return static_cast<uintptr_t>(Value & ~7ULL); |
| 697 | } |
| 698 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 699 | explicit VTableComponent(uint64_t Value) |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 700 | : Value(Value) { } |
| 701 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 702 | /// The kind is stored in the lower 3 bits of the value. For offsets, we |
| 703 | /// make use of the facts that classes can't be larger than 2^55 bytes, |
| 704 | /// so we store the offset in the lower part of the 61 bytes that remain. |
| 705 | /// (The reason that we're not simply using a PointerIntPair here is that we |
| 706 | /// need the offsets to be 64-bit, even when on a 32-bit machine). |
| 707 | int64_t Value; |
| 708 | }; |
| 709 | |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 710 | /// VCallOffsetMap - Keeps track of vcall offsets when building a vtable. |
| 711 | struct VCallOffsetMap { |
| 712 | |
| 713 | typedef std::pair<const CXXMethodDecl *, int64_t> MethodAndOffsetPairTy; |
| 714 | |
| 715 | /// Offsets - Keeps track of methods and their offsets. |
| 716 | // FIXME: This should be a real map and not a vector. |
| 717 | llvm::SmallVector<MethodAndOffsetPairTy, 16> Offsets; |
| 718 | |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 719 | /// MethodsCanShareVCallOffset - Returns whether two virtual member functions |
| 720 | /// can share the same vcall offset. |
| 721 | static bool MethodsCanShareVCallOffset(const CXXMethodDecl *LHS, |
| 722 | const CXXMethodDecl *RHS); |
| 723 | |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 724 | public: |
| 725 | /// AddVCallOffset - Adds a vcall offset to the map. Returns true if the |
| 726 | /// add was successful, or false if there was already a member function with |
| 727 | /// the same signature in the map. |
| 728 | bool AddVCallOffset(const CXXMethodDecl *MD, int64_t OffsetOffset); |
| 729 | |
| 730 | /// getVCallOffsetOffset - Returns the vcall offset offset (relative to the |
| 731 | /// vtable address point) for the given virtual member function. |
| 732 | int64_t getVCallOffsetOffset(const CXXMethodDecl *MD); |
| 733 | |
Anders Carlsson | dba6ef8 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 734 | // empty - Return whether the offset map is empty or not. |
| 735 | bool empty() const { return Offsets.empty(); } |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 736 | }; |
| 737 | |
John McCall | 331a03a | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 738 | static bool HasSameVirtualSignature(const CXXMethodDecl *LHS, |
| 739 | const CXXMethodDecl *RHS) { |
| 740 | ASTContext &C = LHS->getASTContext(); // TODO: thread this down |
| 741 | CanQual<FunctionProtoType> |
| 742 | LT = C.getCanonicalType(LHS->getType()).getAs<FunctionProtoType>(), |
| 743 | RT = C.getCanonicalType(RHS->getType()).getAs<FunctionProtoType>(); |
| 744 | |
| 745 | // Fast-path matches in the canonical types. |
| 746 | if (LT == RT) return true; |
| 747 | |
| 748 | // Force the signatures to match. We can't rely on the overrides |
| 749 | // list here because there isn't necessarily an inheritance |
| 750 | // relationship between the two methods. |
| 751 | if (LT.getQualifiers() != RT.getQualifiers() || |
| 752 | LT->getNumArgs() != RT->getNumArgs()) |
| 753 | return false; |
| 754 | for (unsigned I = 0, E = LT->getNumArgs(); I != E; ++I) |
| 755 | if (LT->getArgType(I) != RT->getArgType(I)) |
| 756 | return false; |
| 757 | return true; |
| 758 | } |
| 759 | |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 760 | bool VCallOffsetMap::MethodsCanShareVCallOffset(const CXXMethodDecl *LHS, |
| 761 | const CXXMethodDecl *RHS) { |
| 762 | assert(LHS->isVirtual() && "LHS must be virtual!"); |
| 763 | assert(RHS->isVirtual() && "LHS must be virtual!"); |
| 764 | |
Anders Carlsson | 5560969 | 2010-02-27 04:12:52 +0000 | [diff] [blame] | 765 | // A destructor can share a vcall offset with another destructor. |
| 766 | if (isa<CXXDestructorDecl>(LHS)) |
| 767 | return isa<CXXDestructorDecl>(RHS); |
| 768 | |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 769 | // FIXME: We need to check more things here. |
| 770 | |
Anders Carlsson | 5560969 | 2010-02-27 04:12:52 +0000 | [diff] [blame] | 771 | // The methods must have the same name. |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 772 | DeclarationName LHSName = LHS->getDeclName(); |
| 773 | DeclarationName RHSName = RHS->getDeclName(); |
John McCall | 331a03a | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 774 | if (LHSName != RHSName) |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 775 | return false; |
John McCall | 331a03a | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 776 | |
Anders Carlsson | 5560969 | 2010-02-27 04:12:52 +0000 | [diff] [blame] | 777 | // And the same signatures. |
| 778 | return HasSameVirtualSignature(LHS, RHS); |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 779 | } |
| 780 | |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 781 | bool VCallOffsetMap::AddVCallOffset(const CXXMethodDecl *MD, |
| 782 | int64_t OffsetOffset) { |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 783 | // Check if we can reuse an offset. |
| 784 | for (unsigned I = 0, E = Offsets.size(); I != E; ++I) { |
| 785 | if (MethodsCanShareVCallOffset(Offsets[I].first, MD)) |
| 786 | return false; |
| 787 | } |
| 788 | |
| 789 | // Add the offset. |
| 790 | Offsets.push_back(MethodAndOffsetPairTy(MD, OffsetOffset)); |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 791 | return true; |
| 792 | } |
| 793 | |
| 794 | int64_t VCallOffsetMap::getVCallOffsetOffset(const CXXMethodDecl *MD) { |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 795 | // Look for an offset. |
| 796 | for (unsigned I = 0, E = Offsets.size(); I != E; ++I) { |
| 797 | if (MethodsCanShareVCallOffset(Offsets[I].first, MD)) |
| 798 | return Offsets[I].second; |
| 799 | } |
| 800 | |
| 801 | assert(false && "Should always find a vcall offset offset!"); |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 802 | return 0; |
| 803 | } |
| 804 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 805 | /// VCallAndVBaseOffsetBuilder - Class for building vcall and vbase offsets. |
| 806 | class VCallAndVBaseOffsetBuilder { |
Anders Carlsson | c89a7cf | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 807 | public: |
| 808 | typedef llvm::DenseMap<const CXXRecordDecl *, int64_t> |
| 809 | VBaseOffsetOffsetsMapTy; |
| 810 | |
| 811 | private: |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 812 | /// MostDerivedClass - The most derived class for which we're building vcall |
| 813 | /// and vbase offsets. |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 814 | const CXXRecordDecl *MostDerivedClass; |
| 815 | |
Anders Carlsson | 0041a64 | 2010-02-27 21:09:00 +0000 | [diff] [blame] | 816 | /// LayoutClass - The class we're using for layout information. Will be |
| 817 | /// different than the most derived class if we're building a construction |
| 818 | /// vtable. |
| 819 | const CXXRecordDecl *LayoutClass; |
| 820 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 821 | /// Context - The ASTContext which we will use for layout information. |
| 822 | ASTContext &Context; |
| 823 | |
| 824 | /// Components - vcall and vbase offset components |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 825 | typedef llvm::SmallVector<VTableComponent, 64> VTableComponentVectorTy; |
| 826 | VTableComponentVectorTy Components; |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 827 | |
| 828 | /// VisitedVirtualBases - Visited virtual bases. |
| 829 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBases; |
| 830 | |
| 831 | /// VCallOffsets - Keeps track of vcall offsets. |
| 832 | VCallOffsetMap VCallOffsets; |
| 833 | |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 834 | |
| 835 | /// VBaseOffsetOffsets - Contains the offsets of the virtual base offsets, |
| 836 | /// relative to the address point. |
| 837 | VBaseOffsetOffsetsMapTy VBaseOffsetOffsets; |
| 838 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 839 | /// FinalOverriders - The final overriders of the most derived class. |
| 840 | /// (Can be null when we're not building a vtable of the most derived class). |
| 841 | const FinalOverriders *Overriders; |
| 842 | |
| 843 | /// AddVCallAndVBaseOffsets - Add vcall offsets and vbase offsets for the |
| 844 | /// given base subobject. |
| 845 | void AddVCallAndVBaseOffsets(BaseSubobject Base, bool BaseIsVirtual, |
| 846 | uint64_t RealBaseOffset); |
| 847 | |
| 848 | /// AddVCallOffsets - Add vcall offsets for the given base subobject. |
| 849 | void AddVCallOffsets(BaseSubobject Base, uint64_t VBaseOffset); |
| 850 | |
| 851 | /// AddVBaseOffsets - Add vbase offsets for the given class. |
Anders Carlsson | 8880066 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 852 | void AddVBaseOffsets(const CXXRecordDecl *Base, uint64_t OffsetInLayoutClass); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 853 | |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 854 | /// getCurrentOffsetOffset - Get the current vcall or vbase offset offset in |
| 855 | /// bytes, relative to the vtable address point. |
| 856 | int64_t getCurrentOffsetOffset() const; |
| 857 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 858 | public: |
| 859 | VCallAndVBaseOffsetBuilder(const CXXRecordDecl *MostDerivedClass, |
Anders Carlsson | 0041a64 | 2010-02-27 21:09:00 +0000 | [diff] [blame] | 860 | const CXXRecordDecl *LayoutClass, |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 861 | const FinalOverriders *Overriders, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 862 | BaseSubobject Base, bool BaseIsVirtual, |
| 863 | uint64_t OffsetInLayoutClass) |
| 864 | : MostDerivedClass(MostDerivedClass), LayoutClass(LayoutClass), |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 865 | Context(MostDerivedClass->getASTContext()), Overriders(Overriders) { |
| 866 | |
| 867 | // Add vcall and vbase offsets. |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 868 | AddVCallAndVBaseOffsets(Base, BaseIsVirtual, OffsetInLayoutClass); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | /// Methods for iterating over the components. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 872 | typedef VTableComponentVectorTy::const_reverse_iterator const_iterator; |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 873 | const_iterator components_begin() const { return Components.rbegin(); } |
| 874 | const_iterator components_end() const { return Components.rend(); } |
| 875 | |
Anders Carlsson | c89a7cf | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 876 | const VCallOffsetMap &getVCallOffsets() const { return VCallOffsets; } |
| 877 | const VBaseOffsetOffsetsMapTy &getVBaseOffsetOffsets() const { |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 878 | return VBaseOffsetOffsets; |
| 879 | } |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 880 | }; |
| 881 | |
| 882 | void |
| 883 | VCallAndVBaseOffsetBuilder::AddVCallAndVBaseOffsets(BaseSubobject Base, |
| 884 | bool BaseIsVirtual, |
| 885 | uint64_t RealBaseOffset) { |
| 886 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(Base.getBase()); |
| 887 | |
| 888 | // Itanium C++ ABI 2.5.2: |
| 889 | // ..in classes sharing a virtual table with a primary base class, the vcall |
| 890 | // and vbase offsets added by the derived class all come before the vcall |
| 891 | // and vbase offsets required by the base class, so that the latter may be |
| 892 | // laid out as required by the base class without regard to additions from |
| 893 | // the derived class(es). |
| 894 | |
| 895 | // (Since we're emitting the vcall and vbase offsets in reverse order, we'll |
| 896 | // emit them for the primary base first). |
| 897 | if (const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase()) { |
| 898 | bool PrimaryBaseIsVirtual = Layout.getPrimaryBaseWasVirtual(); |
| 899 | |
| 900 | uint64_t PrimaryBaseOffset; |
| 901 | |
| 902 | // Get the base offset of the primary base. |
| 903 | if (PrimaryBaseIsVirtual) { |
| 904 | assert(Layout.getVBaseClassOffset(PrimaryBase) == 0 && |
| 905 | "Primary vbase should have a zero offset!"); |
| 906 | |
| 907 | const ASTRecordLayout &MostDerivedClassLayout = |
| 908 | Context.getASTRecordLayout(MostDerivedClass); |
| 909 | |
| 910 | PrimaryBaseOffset = |
| 911 | MostDerivedClassLayout.getVBaseClassOffset(PrimaryBase); |
| 912 | } else { |
| 913 | assert(Layout.getBaseClassOffset(PrimaryBase) == 0 && |
| 914 | "Primary base should have a zero offset!"); |
| 915 | |
| 916 | PrimaryBaseOffset = Base.getBaseOffset(); |
| 917 | } |
| 918 | |
| 919 | AddVCallAndVBaseOffsets(BaseSubobject(PrimaryBase, PrimaryBaseOffset), |
| 920 | PrimaryBaseIsVirtual, RealBaseOffset); |
| 921 | } |
| 922 | |
Anders Carlsson | 8880066 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 923 | AddVBaseOffsets(Base.getBase(), RealBaseOffset); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 924 | |
| 925 | // We only want to add vcall offsets for virtual bases. |
| 926 | if (BaseIsVirtual) |
| 927 | AddVCallOffsets(Base, RealBaseOffset); |
| 928 | } |
| 929 | |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 930 | int64_t VCallAndVBaseOffsetBuilder::getCurrentOffsetOffset() const { |
| 931 | // OffsetIndex is the index of this vcall or vbase offset, relative to the |
| 932 | // vtable address point. (We subtract 3 to account for the information just |
| 933 | // above the address point, the RTTI info, the offset to top, and the |
| 934 | // vcall offset itself). |
| 935 | int64_t OffsetIndex = -(int64_t)(3 + Components.size()); |
| 936 | |
| 937 | // FIXME: We shouldn't use / 8 here. |
| 938 | int64_t OffsetOffset = OffsetIndex * |
| 939 | (int64_t)Context.Target.getPointerWidth(0) / 8; |
| 940 | |
| 941 | return OffsetOffset; |
| 942 | } |
| 943 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 944 | void VCallAndVBaseOffsetBuilder::AddVCallOffsets(BaseSubobject Base, |
| 945 | uint64_t VBaseOffset) { |
| 946 | const CXXRecordDecl *RD = Base.getBase(); |
| 947 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 948 | |
John McCall | 331a03a | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 949 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 950 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 951 | // Handle the primary base first. |
Anders Carlsson | af6ddf2 | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 952 | // We only want to add vcall offsets if the base is non-virtual; a virtual |
| 953 | // primary base will have its vcall and vbase offsets emitted already. |
| 954 | if (PrimaryBase && !Layout.getPrimaryBaseWasVirtual()) { |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 955 | // Get the base offset of the primary base. |
Anders Carlsson | af6ddf2 | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 956 | assert(Layout.getBaseClassOffset(PrimaryBase) == 0 && |
| 957 | "Primary base should have a zero offset!"); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 958 | |
Anders Carlsson | af6ddf2 | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 959 | AddVCallOffsets(BaseSubobject(PrimaryBase, Base.getBaseOffset()), |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 960 | VBaseOffset); |
| 961 | } |
Anders Carlsson | af6ddf2 | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 962 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 963 | // Add the vcall offsets. |
| 964 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 965 | E = RD->method_end(); I != E; ++I) { |
| 966 | const CXXMethodDecl *MD = *I; |
| 967 | |
| 968 | if (!MD->isVirtual()) |
| 969 | continue; |
| 970 | |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 971 | int64_t OffsetOffset = getCurrentOffsetOffset(); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 972 | |
| 973 | // Don't add a vcall offset if we already have one for this member function |
| 974 | // signature. |
| 975 | if (!VCallOffsets.AddVCallOffset(MD, OffsetOffset)) |
| 976 | continue; |
| 977 | |
| 978 | int64_t Offset = 0; |
| 979 | |
| 980 | if (Overriders) { |
| 981 | // Get the final overrider. |
| 982 | FinalOverriders::OverriderInfo Overrider = |
Anders Carlsson | 2638764 | 2010-06-01 23:17:37 +0000 | [diff] [blame] | 983 | Overriders->getOverrider(MD, Base.getBaseOffset()); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 984 | |
Anders Carlsson | 438bc42 | 2010-02-28 00:10:58 +0000 | [diff] [blame] | 985 | /// The vcall offset is the offset from the virtual base to the object |
| 986 | /// where the function was overridden. |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 987 | // FIXME: We should not use / 8 here. |
Anders Carlsson | d86e5d8 | 2010-03-02 03:44:06 +0000 | [diff] [blame] | 988 | Offset = (int64_t)(Overrider.Offset - VBaseOffset) / 8; |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 989 | } |
| 990 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 991 | Components.push_back(VTableComponent::MakeVCallOffset(Offset)); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | // And iterate over all non-virtual bases (ignoring the primary base). |
| 995 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 996 | E = RD->bases_end(); I != E; ++I) { |
| 997 | |
| 998 | if (I->isVirtual()) |
| 999 | continue; |
| 1000 | |
| 1001 | const CXXRecordDecl *BaseDecl = |
| 1002 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
John McCall | 331a03a | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 1003 | if (BaseDecl == PrimaryBase) |
| 1004 | continue; |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1005 | |
| 1006 | // Get the base offset of this base. |
| 1007 | uint64_t BaseOffset = Base.getBaseOffset() + |
| 1008 | Layout.getBaseClassOffset(BaseDecl); |
| 1009 | |
| 1010 | AddVCallOffsets(BaseSubobject(BaseDecl, BaseOffset), VBaseOffset); |
| 1011 | } |
| 1012 | } |
| 1013 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1014 | void VCallAndVBaseOffsetBuilder::AddVBaseOffsets(const CXXRecordDecl *RD, |
Anders Carlsson | 8880066 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 1015 | uint64_t OffsetInLayoutClass) { |
Anders Carlsson | 0041a64 | 2010-02-27 21:09:00 +0000 | [diff] [blame] | 1016 | const ASTRecordLayout &LayoutClassLayout = |
| 1017 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1018 | |
| 1019 | // Add vbase offsets. |
| 1020 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1021 | E = RD->bases_end(); I != E; ++I) { |
| 1022 | const CXXRecordDecl *BaseDecl = |
| 1023 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 1024 | |
| 1025 | // Check if this is a virtual base that we haven't visited before. |
| 1026 | if (I->isVirtual() && VisitedVirtualBases.insert(BaseDecl)) { |
| 1027 | // FIXME: We shouldn't use / 8 here. |
Anders Carlsson | 8880066 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 1028 | int64_t Offset = |
| 1029 | (int64_t)(LayoutClassLayout.getVBaseClassOffset(BaseDecl) - |
| 1030 | OffsetInLayoutClass) / 8; |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 1031 | |
| 1032 | // Add the vbase offset offset. |
| 1033 | assert(!VBaseOffsetOffsets.count(BaseDecl) && |
| 1034 | "vbase offset offset already exists!"); |
| 1035 | |
| 1036 | int64_t VBaseOffsetOffset = getCurrentOffsetOffset(); |
| 1037 | VBaseOffsetOffsets.insert(std::make_pair(BaseDecl, VBaseOffsetOffset)); |
| 1038 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1039 | Components.push_back(VTableComponent::MakeVBaseOffset(Offset)); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1040 | } |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 1041 | |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1042 | // Check the base class looking for more vbase offsets. |
Anders Carlsson | 8880066 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 1043 | AddVBaseOffsets(BaseDecl, OffsetInLayoutClass); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1044 | } |
| 1045 | } |
| 1046 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1047 | /// VTableBuilder - Class for building vtable layout information. |
| 1048 | class VTableBuilder { |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1049 | public: |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1050 | /// PrimaryBasesSetVectorTy - A set vector of direct and indirect |
| 1051 | /// primary bases. |
| 1052 | typedef llvm::SmallSetVector<const CXXRecordDecl *, 8> |
| 1053 | PrimaryBasesSetVectorTy; |
| 1054 | |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1055 | typedef llvm::DenseMap<const CXXRecordDecl *, int64_t> |
| 1056 | VBaseOffsetOffsetsMapTy; |
Anders Carlsson | 66d567d | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1057 | |
| 1058 | typedef llvm::DenseMap<BaseSubobject, uint64_t> |
| 1059 | AddressPointsMapTy; |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1060 | |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1061 | private: |
Anders Carlsson | af44035 | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 1062 | /// VTables - Global vtable information. |
| 1063 | CodeGenVTables &VTables; |
Anders Carlsson | 60db0ee | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1064 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1065 | /// MostDerivedClass - The most derived class for which we're building this |
| 1066 | /// vtable. |
| 1067 | const CXXRecordDecl *MostDerivedClass; |
| 1068 | |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1069 | /// MostDerivedClassOffset - If we're building a construction vtable, this |
| 1070 | /// holds the offset from the layout class to the most derived class. |
| 1071 | const uint64_t MostDerivedClassOffset; |
| 1072 | |
Anders Carlsson | 5d7af6b | 2010-02-28 00:36:23 +0000 | [diff] [blame] | 1073 | /// MostDerivedClassIsVirtual - Whether the most derived class is a virtual |
| 1074 | /// base. (This only makes sense when building a construction vtable). |
| 1075 | bool MostDerivedClassIsVirtual; |
| 1076 | |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1077 | /// LayoutClass - The class we're using for layout information. Will be |
| 1078 | /// different than the most derived class if we're building a construction |
| 1079 | /// vtable. |
| 1080 | const CXXRecordDecl *LayoutClass; |
| 1081 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1082 | /// Context - The ASTContext which we will use for layout information. |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1083 | ASTContext &Context; |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1084 | |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 1085 | /// FinalOverriders - The final overriders of the most derived class. |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1086 | const FinalOverriders Overriders; |
Anders Carlsson | bdf73d8 | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 1087 | |
Anders Carlsson | dba6ef8 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 1088 | /// VCallOffsetsForVBases - Keeps track of vcall offsets for the virtual |
| 1089 | /// bases in this vtable. |
| 1090 | llvm::DenseMap<const CXXRecordDecl *, VCallOffsetMap> VCallOffsetsForVBases; |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 1091 | |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 1092 | /// VBaseOffsetOffsets - Contains the offsets of the virtual base offsets for |
| 1093 | /// the most derived class. |
| 1094 | VBaseOffsetOffsetsMapTy VBaseOffsetOffsets; |
| 1095 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1096 | /// Components - The components of the vtable being built. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1097 | llvm::SmallVector<VTableComponent, 64> Components; |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1098 | |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1099 | /// AddressPoints - Address points for the vtable being built. |
Anders Carlsson | ff143f8 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 1100 | AddressPointsMapTy AddressPoints; |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1101 | |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1102 | /// MethodInfo - Contains information about a method in a vtable. |
| 1103 | /// (Used for computing 'this' pointer adjustment thunks. |
| 1104 | struct MethodInfo { |
| 1105 | /// BaseOffset - The base offset of this method. |
| 1106 | const uint64_t BaseOffset; |
| 1107 | |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1108 | /// BaseOffsetInLayoutClass - The base offset in the layout class of this |
| 1109 | /// method. |
| 1110 | const uint64_t BaseOffsetInLayoutClass; |
| 1111 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1112 | /// VTableIndex - The index in the vtable that this method has. |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1113 | /// (For destructors, this is the index of the complete destructor). |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1114 | const uint64_t VTableIndex; |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1115 | |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1116 | MethodInfo(uint64_t BaseOffset, uint64_t BaseOffsetInLayoutClass, |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1117 | uint64_t VTableIndex) |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1118 | : BaseOffset(BaseOffset), |
| 1119 | BaseOffsetInLayoutClass(BaseOffsetInLayoutClass), |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1120 | VTableIndex(VTableIndex) { } |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1121 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1122 | MethodInfo() : BaseOffset(0), BaseOffsetInLayoutClass(0), VTableIndex(0) { } |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1123 | }; |
| 1124 | |
| 1125 | typedef llvm::DenseMap<const CXXMethodDecl *, MethodInfo> MethodInfoMapTy; |
| 1126 | |
| 1127 | /// MethodInfoMap - The information for all methods in the vtable we're |
| 1128 | /// currently building. |
| 1129 | MethodInfoMapTy MethodInfoMap; |
| 1130 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1131 | typedef llvm::DenseMap<uint64_t, ThunkInfo> VTableThunksMapTy; |
Anders Carlsson | dd36681 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 1132 | |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1133 | /// VTableThunks - The thunks by vtable index in the vtable currently being |
| 1134 | /// built. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1135 | VTableThunksMapTy VTableThunks; |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1136 | |
Anders Carlsson | ee5ab9f | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 1137 | typedef llvm::SmallVector<ThunkInfo, 1> ThunkInfoVectorTy; |
| 1138 | typedef llvm::DenseMap<const CXXMethodDecl *, ThunkInfoVectorTy> ThunksMapTy; |
Anders Carlsson | 5e454aa | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1139 | |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1140 | /// Thunks - A map that contains all the thunks needed for all methods in the |
| 1141 | /// most derived class for which the vtable is currently being built. |
Anders Carlsson | ee5ab9f | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 1142 | ThunksMapTy Thunks; |
Anders Carlsson | 5e454aa | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1143 | |
| 1144 | /// AddThunk - Add a thunk for the given method. |
Anders Carlsson | 9d734f3 | 2010-03-21 20:27:14 +0000 | [diff] [blame] | 1145 | void AddThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk); |
Anders Carlsson | 5e454aa | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1146 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1147 | /// ComputeThisAdjustments - Compute the 'this' pointer adjustments for the |
| 1148 | /// part of the vtable we're currently building. |
| 1149 | void ComputeThisAdjustments(); |
| 1150 | |
Anders Carlsson | a661a54 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 1151 | typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy; |
| 1152 | |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1153 | /// PrimaryVirtualBases - All known virtual bases who are a primary base of |
Anders Carlsson | af280c0 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1154 | /// some other base. |
| 1155 | VisitedVirtualBasesSetTy PrimaryVirtualBases; |
| 1156 | |
Anders Carlsson | 60db0ee | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1157 | /// ComputeReturnAdjustment - Compute the return adjustment given a return |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1158 | /// adjustment base offset. |
Anders Carlsson | 2fca9be | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 1159 | ReturnAdjustment ComputeReturnAdjustment(BaseOffset Offset); |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1160 | |
Anders Carlsson | 379017f | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1161 | /// ComputeThisAdjustmentBaseOffset - Compute the base offset for adjusting |
| 1162 | /// the 'this' pointer from the base subobject to the derived subobject. |
| 1163 | BaseOffset ComputeThisAdjustmentBaseOffset(BaseSubobject Base, |
| 1164 | BaseSubobject Derived) const; |
| 1165 | |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 1166 | /// ComputeThisAdjustment - Compute the 'this' pointer adjustment for the |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1167 | /// given virtual member function, its offset in the layout class and its |
| 1168 | /// final overrider. |
| 1169 | ThisAdjustment |
| 1170 | ComputeThisAdjustment(const CXXMethodDecl *MD, |
| 1171 | uint64_t BaseOffsetInLayoutClass, |
| 1172 | FinalOverriders::OverriderInfo Overrider); |
| 1173 | |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1174 | /// AddMethod - Add a single virtual member function to the vtable |
| 1175 | /// components vector. |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1176 | void AddMethod(const CXXMethodDecl *MD, ReturnAdjustment ReturnAdjustment); |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1177 | |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1178 | /// IsOverriderUsed - Returns whether the overrider will ever be used in this |
| 1179 | /// part of the vtable. |
| 1180 | /// |
| 1181 | /// Itanium C++ ABI 2.5.2: |
| 1182 | /// |
| 1183 | /// struct A { virtual void f(); }; |
| 1184 | /// struct B : virtual public A { int i; }; |
| 1185 | /// struct C : virtual public A { int j; }; |
| 1186 | /// struct D : public B, public C {}; |
| 1187 | /// |
| 1188 | /// When B and C are declared, A is a primary base in each case, so although |
| 1189 | /// vcall offsets are allocated in the A-in-B and A-in-C vtables, no this |
| 1190 | /// adjustment is required and no thunk is generated. However, inside D |
| 1191 | /// objects, A is no longer a primary base of C, so if we allowed calls to |
| 1192 | /// C::f() to use the copy of A's vtable in the C subobject, we would need |
| 1193 | /// to adjust this from C* to B::A*, which would require a third-party |
| 1194 | /// thunk. Since we require that a call to C::f() first convert to A*, |
| 1195 | /// C-in-D's copy of A's vtable is never referenced, so this is not |
| 1196 | /// necessary. |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1197 | bool IsOverriderUsed(const CXXMethodDecl *Overrider, |
| 1198 | uint64_t BaseOffsetInLayoutClass, |
| 1199 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1200 | uint64_t FirstBaseOffsetInLayoutClass) const; |
| 1201 | |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1202 | |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1203 | /// AddMethods - Add the methods of this base subobject and all its |
| 1204 | /// primary bases to the vtable components vector. |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1205 | void AddMethods(BaseSubobject Base, uint64_t BaseOffsetInLayoutClass, |
| 1206 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1207 | uint64_t FirstBaseOffsetInLayoutClass, |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1208 | PrimaryBasesSetVectorTy &PrimaryBases); |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1209 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1210 | // LayoutVTable - Layout the vtable for the given base class, including its |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1211 | // secondary vtables and any vtables for virtual bases. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1212 | void LayoutVTable(); |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1213 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1214 | /// LayoutPrimaryAndSecondaryVTables - Layout the primary vtable for the |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1215 | /// given base subobject, as well as all its secondary vtables. |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1216 | /// |
Anders Carlsson | 73e6fa0 | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1217 | /// \param BaseIsMorallyVirtual whether the base subobject is a virtual base |
| 1218 | /// or a direct or indirect base of a virtual base. |
| 1219 | /// |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1220 | /// \param BaseIsVirtualInLayoutClass - Whether the base subobject is virtual |
| 1221 | /// in the layout class. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1222 | void LayoutPrimaryAndSecondaryVTables(BaseSubobject Base, |
Anders Carlsson | 73e6fa0 | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1223 | bool BaseIsMorallyVirtual, |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1224 | bool BaseIsVirtualInLayoutClass, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1225 | uint64_t OffsetInLayoutClass); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1226 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1227 | /// LayoutSecondaryVTables - Layout the secondary vtables for the given base |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1228 | /// subobject. |
Anders Carlsson | a96a2e9 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1229 | /// |
| 1230 | /// \param BaseIsMorallyVirtual whether the base subobject is a virtual base |
| 1231 | /// or a direct or indirect base of a virtual base. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1232 | void LayoutSecondaryVTables(BaseSubobject Base, bool BaseIsMorallyVirtual, |
Anders Carlsson | a96a2e9 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1233 | uint64_t OffsetInLayoutClass); |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1234 | |
| 1235 | /// DeterminePrimaryVirtualBases - Determine the primary virtual bases in this |
| 1236 | /// class hierarchy. |
| 1237 | void DeterminePrimaryVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | d7fdae5 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1238 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1239 | VisitedVirtualBasesSetTy &VBases); |
| 1240 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1241 | /// LayoutVTablesForVirtualBases - Layout vtables for all virtual bases of the |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1242 | /// given base (excluding any primary bases). |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1243 | void LayoutVTablesForVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1244 | VisitedVirtualBasesSetTy &VBases); |
| 1245 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1246 | /// isBuildingConstructionVTable - Return whether this vtable builder is |
Anders Carlsson | 438bc42 | 2010-02-28 00:10:58 +0000 | [diff] [blame] | 1247 | /// building a construction vtable. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1248 | bool isBuildingConstructorVTable() const { |
Anders Carlsson | 438bc42 | 2010-02-28 00:10:58 +0000 | [diff] [blame] | 1249 | return MostDerivedClass != LayoutClass; |
| 1250 | } |
| 1251 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1252 | public: |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1253 | VTableBuilder(CodeGenVTables &VTables, const CXXRecordDecl *MostDerivedClass, |
Anders Carlsson | 5d7af6b | 2010-02-28 00:36:23 +0000 | [diff] [blame] | 1254 | uint64_t MostDerivedClassOffset, bool MostDerivedClassIsVirtual, |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1255 | const CXXRecordDecl *LayoutClass) |
Anders Carlsson | af44035 | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 1256 | : VTables(VTables), MostDerivedClass(MostDerivedClass), |
Anders Carlsson | 5d7af6b | 2010-02-28 00:36:23 +0000 | [diff] [blame] | 1257 | MostDerivedClassOffset(MostDerivedClassOffset), |
| 1258 | MostDerivedClassIsVirtual(MostDerivedClassIsVirtual), |
| 1259 | LayoutClass(LayoutClass), Context(MostDerivedClass->getASTContext()), |
Anders Carlsson | db4022c | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 1260 | Overriders(MostDerivedClass, MostDerivedClassOffset, LayoutClass) { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1261 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1262 | LayoutVTable(); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1263 | } |
| 1264 | |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 1265 | ThunksMapTy::const_iterator thunks_begin() const { |
| 1266 | return Thunks.begin(); |
| 1267 | } |
| 1268 | |
| 1269 | ThunksMapTy::const_iterator thunks_end() const { |
| 1270 | return Thunks.end(); |
| 1271 | } |
| 1272 | |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1273 | const VBaseOffsetOffsetsMapTy &getVBaseOffsetOffsets() const { |
| 1274 | return VBaseOffsetOffsets; |
| 1275 | } |
| 1276 | |
| 1277 | /// getNumVTableComponents - Return the number of components in the vtable |
| 1278 | /// currently built. |
| 1279 | uint64_t getNumVTableComponents() const { |
| 1280 | return Components.size(); |
| 1281 | } |
| 1282 | |
Anders Carlsson | 66d567d | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1283 | const uint64_t *vtable_components_data_begin() const { |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1284 | return reinterpret_cast<const uint64_t *>(Components.begin()); |
| 1285 | } |
| 1286 | |
Anders Carlsson | 66d567d | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1287 | const uint64_t *vtable_components_data_end() const { |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1288 | return reinterpret_cast<const uint64_t *>(Components.end()); |
| 1289 | } |
| 1290 | |
Anders Carlsson | 66d567d | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1291 | AddressPointsMapTy::const_iterator address_points_begin() const { |
| 1292 | return AddressPoints.begin(); |
| 1293 | } |
| 1294 | |
| 1295 | AddressPointsMapTy::const_iterator address_points_end() const { |
| 1296 | return AddressPoints.end(); |
| 1297 | } |
| 1298 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1299 | VTableThunksMapTy::const_iterator vtable_thunks_begin() const { |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 1300 | return VTableThunks.begin(); |
| 1301 | } |
| 1302 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1303 | VTableThunksMapTy::const_iterator vtable_thunks_end() const { |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 1304 | return VTableThunks.end(); |
| 1305 | } |
| 1306 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1307 | /// dumpLayout - Dump the vtable layout. |
| 1308 | void dumpLayout(llvm::raw_ostream&); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1309 | }; |
| 1310 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1311 | void VTableBuilder::AddThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk) { |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1312 | assert(!isBuildingConstructorVTable() && |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1313 | "Can't add thunks for construction vtable"); |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 1314 | |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1315 | llvm::SmallVector<ThunkInfo, 1> &ThunksVector = Thunks[MD]; |
Anders Carlsson | 5e454aa | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1316 | |
| 1317 | // Check if we have this thunk already. |
| 1318 | if (std::find(ThunksVector.begin(), ThunksVector.end(), Thunk) != |
| 1319 | ThunksVector.end()) |
| 1320 | return; |
| 1321 | |
| 1322 | ThunksVector.push_back(Thunk); |
| 1323 | } |
| 1324 | |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1325 | typedef llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverriddenMethodsSetTy; |
| 1326 | |
| 1327 | /// ComputeAllOverriddenMethods - Given a method decl, will return a set of all |
| 1328 | /// the overridden methods that the function decl overrides. |
| 1329 | static void |
| 1330 | ComputeAllOverriddenMethods(const CXXMethodDecl *MD, |
| 1331 | OverriddenMethodsSetTy& OverriddenMethods) { |
| 1332 | assert(MD->isVirtual() && "Method is not virtual!"); |
| 1333 | |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1334 | for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), |
| 1335 | E = MD->end_overridden_methods(); I != E; ++I) { |
| 1336 | const CXXMethodDecl *OverriddenMD = *I; |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1337 | |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1338 | OverriddenMethods.insert(OverriddenMD); |
| 1339 | |
| 1340 | ComputeAllOverriddenMethods(OverriddenMD, OverriddenMethods); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1341 | } |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1342 | } |
| 1343 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1344 | void VTableBuilder::ComputeThisAdjustments() { |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1345 | // Now go through the method info map and see if any of the methods need |
| 1346 | // 'this' pointer adjustments. |
| 1347 | for (MethodInfoMapTy::const_iterator I = MethodInfoMap.begin(), |
| 1348 | E = MethodInfoMap.end(); I != E; ++I) { |
| 1349 | const CXXMethodDecl *MD = I->first; |
| 1350 | const MethodInfo &MethodInfo = I->second; |
| 1351 | |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1352 | // Ignore adjustments for unused function pointers. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1353 | uint64_t VTableIndex = MethodInfo.VTableIndex; |
| 1354 | if (Components[VTableIndex].getKind() == |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1355 | VTableComponent::CK_UnusedFunctionPointer) |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1356 | continue; |
| 1357 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1358 | // Get the final overrider for this method. |
| 1359 | FinalOverriders::OverriderInfo Overrider = |
Anders Carlsson | 2638764 | 2010-06-01 23:17:37 +0000 | [diff] [blame] | 1360 | Overriders.getOverrider(MD, MethodInfo.BaseOffset); |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1361 | |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1362 | // Check if we need an adjustment at all. |
Anders Carlsson | adb507d | 2010-03-29 15:08:41 +0000 | [diff] [blame] | 1363 | if (MethodInfo.BaseOffsetInLayoutClass == Overrider.Offset) { |
| 1364 | // When a return thunk is needed by a derived class that overrides a |
| 1365 | // virtual base, gcc uses a virtual 'this' adjustment as well. |
| 1366 | // While the thunk itself might be needed by vtables in subclasses or |
| 1367 | // in construction vtables, there doesn't seem to be a reason for using |
| 1368 | // the thunk in this vtable. Still, we do so to match gcc. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1369 | if (VTableThunks.lookup(VTableIndex).Return.isEmpty()) |
Anders Carlsson | adb507d | 2010-03-29 15:08:41 +0000 | [diff] [blame] | 1370 | continue; |
| 1371 | } |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1372 | |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1373 | ThisAdjustment ThisAdjustment = |
| 1374 | ComputeThisAdjustment(MD, MethodInfo.BaseOffsetInLayoutClass, Overrider); |
| 1375 | |
| 1376 | if (ThisAdjustment.isEmpty()) |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1377 | continue; |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1378 | |
Anders Carlsson | cd4e637 | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1379 | // Add it. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1380 | VTableThunks[VTableIndex].This = ThisAdjustment; |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1381 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1382 | if (isa<CXXDestructorDecl>(MD)) { |
| 1383 | // Add an adjustment for the deleting destructor as well. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1384 | VTableThunks[VTableIndex + 1].This = ThisAdjustment; |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1385 | } |
| 1386 | } |
| 1387 | |
| 1388 | /// Clear the method info map. |
| 1389 | MethodInfoMap.clear(); |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1390 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1391 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1392 | // We don't need to store thunk information for construction vtables. |
| 1393 | return; |
| 1394 | } |
| 1395 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1396 | for (VTableThunksMapTy::const_iterator I = VTableThunks.begin(), |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1397 | E = VTableThunks.end(); I != E; ++I) { |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1398 | const VTableComponent &Component = Components[I->first]; |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1399 | const ThunkInfo &Thunk = I->second; |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1400 | const CXXMethodDecl *MD; |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1401 | |
| 1402 | switch (Component.getKind()) { |
| 1403 | default: |
| 1404 | llvm_unreachable("Unexpected vtable component kind!"); |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1405 | case VTableComponent::CK_FunctionPointer: |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1406 | MD = Component.getFunctionDecl(); |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1407 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1408 | case VTableComponent::CK_CompleteDtorPointer: |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1409 | MD = Component.getDestructorDecl(); |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1410 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1411 | case VTableComponent::CK_DeletingDtorPointer: |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1412 | // We've already added the thunk when we saw the complete dtor pointer. |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1413 | continue; |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1414 | } |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1415 | |
| 1416 | if (MD->getParent() == MostDerivedClass) |
| 1417 | AddThunk(MD, Thunk); |
Anders Carlsson | 2539421 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1418 | } |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1419 | } |
| 1420 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1421 | ReturnAdjustment VTableBuilder::ComputeReturnAdjustment(BaseOffset Offset) { |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1422 | ReturnAdjustment Adjustment; |
| 1423 | |
| 1424 | if (!Offset.isEmpty()) { |
Anders Carlsson | 60db0ee | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1425 | if (Offset.VirtualBase) { |
| 1426 | // Get the virtual base offset offset. |
Anders Carlsson | 1972ced | 2010-03-11 07:00:45 +0000 | [diff] [blame] | 1427 | if (Offset.DerivedClass == MostDerivedClass) { |
| 1428 | // We can get the offset offset directly from our map. |
| 1429 | Adjustment.VBaseOffsetOffset = |
| 1430 | VBaseOffsetOffsets.lookup(Offset.VirtualBase); |
| 1431 | } else { |
| 1432 | Adjustment.VBaseOffsetOffset = |
Anders Carlsson | af44035 | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 1433 | VTables.getVirtualBaseOffsetOffset(Offset.DerivedClass, |
| 1434 | Offset.VirtualBase); |
Anders Carlsson | 1972ced | 2010-03-11 07:00:45 +0000 | [diff] [blame] | 1435 | } |
Anders Carlsson | 60db0ee | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1436 | } |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1437 | |
| 1438 | Adjustment.NonVirtual = Offset.NonVirtualOffset; |
| 1439 | } |
| 1440 | |
| 1441 | return Adjustment; |
| 1442 | } |
| 1443 | |
Anders Carlsson | 379017f | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1444 | BaseOffset |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1445 | VTableBuilder::ComputeThisAdjustmentBaseOffset(BaseSubobject Base, |
Anders Carlsson | 379017f | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1446 | BaseSubobject Derived) const { |
| 1447 | const CXXRecordDecl *BaseRD = Base.getBase(); |
| 1448 | const CXXRecordDecl *DerivedRD = Derived.getBase(); |
| 1449 | |
| 1450 | CXXBasePaths Paths(/*FindAmbiguities=*/true, |
| 1451 | /*RecordPaths=*/true, /*DetectVirtual=*/true); |
| 1452 | |
| 1453 | if (!const_cast<CXXRecordDecl *>(DerivedRD)-> |
| 1454 | isDerivedFrom(const_cast<CXXRecordDecl *>(BaseRD), Paths)) { |
| 1455 | assert(false && "Class must be derived from the passed in base class!"); |
| 1456 | return BaseOffset(); |
| 1457 | } |
| 1458 | |
| 1459 | // We have to go through all the paths, and see which one leads us to the |
| 1460 | // right base subobject. |
| 1461 | for (CXXBasePaths::const_paths_iterator I = Paths.begin(), E = Paths.end(); |
| 1462 | I != E; ++I) { |
| 1463 | BaseOffset Offset = ComputeBaseOffset(Context, DerivedRD, *I); |
| 1464 | |
| 1465 | // FIXME: Should not use * 8 here. |
| 1466 | uint64_t OffsetToBaseSubobject = Offset.NonVirtualOffset * 8; |
| 1467 | |
| 1468 | if (Offset.VirtualBase) { |
| 1469 | // If we have a virtual base class, the non-virtual offset is relative |
| 1470 | // to the virtual base class offset. |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1471 | const ASTRecordLayout &LayoutClassLayout = |
| 1472 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | 379017f | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1473 | |
| 1474 | /// Get the virtual base offset, relative to the most derived class |
| 1475 | /// layout. |
| 1476 | OffsetToBaseSubobject += |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1477 | LayoutClassLayout.getVBaseClassOffset(Offset.VirtualBase); |
Anders Carlsson | 379017f | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1478 | } else { |
| 1479 | // Otherwise, the non-virtual offset is relative to the derived class |
| 1480 | // offset. |
| 1481 | OffsetToBaseSubobject += Derived.getBaseOffset(); |
| 1482 | } |
| 1483 | |
| 1484 | // Check if this path gives us the right base subobject. |
| 1485 | if (OffsetToBaseSubobject == Base.getBaseOffset()) { |
| 1486 | // Since we're going from the base class _to_ the derived class, we'll |
| 1487 | // invert the non-virtual offset here. |
| 1488 | Offset.NonVirtualOffset = -Offset.NonVirtualOffset; |
| 1489 | return Offset; |
| 1490 | } |
| 1491 | } |
| 1492 | |
| 1493 | return BaseOffset(); |
| 1494 | } |
| 1495 | |
Anders Carlsson | 80d8d7d | 2010-03-23 15:13:06 +0000 | [diff] [blame] | 1496 | ThisAdjustment |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1497 | VTableBuilder::ComputeThisAdjustment(const CXXMethodDecl *MD, |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1498 | uint64_t BaseOffsetInLayoutClass, |
| 1499 | FinalOverriders::OverriderInfo Overrider) { |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1500 | // Ignore adjustments for pure virtual member functions. |
| 1501 | if (Overrider.Method->isPure()) |
| 1502 | return ThisAdjustment(); |
| 1503 | |
| 1504 | BaseSubobject OverriddenBaseSubobject(MD->getParent(), |
| 1505 | BaseOffsetInLayoutClass); |
| 1506 | |
| 1507 | BaseSubobject OverriderBaseSubobject(Overrider.Method->getParent(), |
| 1508 | Overrider.Offset); |
| 1509 | |
| 1510 | // Compute the adjustment offset. |
| 1511 | BaseOffset Offset = ComputeThisAdjustmentBaseOffset(OverriddenBaseSubobject, |
| 1512 | OverriderBaseSubobject); |
| 1513 | if (Offset.isEmpty()) |
| 1514 | return ThisAdjustment(); |
| 1515 | |
Anders Carlsson | 49bac9a | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1516 | ThisAdjustment Adjustment; |
| 1517 | |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1518 | if (Offset.VirtualBase) { |
| 1519 | // Get the vcall offset map for this virtual base. |
| 1520 | VCallOffsetMap &VCallOffsets = VCallOffsetsForVBases[Offset.VirtualBase]; |
Anders Carlsson | eb577d0 | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 1521 | |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1522 | if (VCallOffsets.empty()) { |
| 1523 | // We don't have vcall offsets for this virtual base, go ahead and |
| 1524 | // build them. |
| 1525 | VCallAndVBaseOffsetBuilder Builder(MostDerivedClass, MostDerivedClass, |
| 1526 | /*FinalOverriders=*/0, |
| 1527 | BaseSubobject(Offset.VirtualBase, 0), |
| 1528 | /*BaseIsVirtual=*/true, |
| 1529 | /*OffsetInLayoutClass=*/0); |
| 1530 | |
| 1531 | VCallOffsets = Builder.getVCallOffsets(); |
| 1532 | } |
| 1533 | |
| 1534 | Adjustment.VCallOffsetOffset = VCallOffsets.getVCallOffsetOffset(MD); |
Anders Carlsson | 49bac9a | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1535 | } |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1536 | |
| 1537 | // Set the non-virtual part of the adjustment. |
| 1538 | Adjustment.NonVirtual = Offset.NonVirtualOffset; |
Anders Carlsson | 49bac9a | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1539 | |
| 1540 | return Adjustment; |
| 1541 | } |
Anders Carlsson | 617def3 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1542 | |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1543 | void |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1544 | VTableBuilder::AddMethod(const CXXMethodDecl *MD, |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1545 | ReturnAdjustment ReturnAdjustment) { |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1546 | if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) { |
| 1547 | assert(ReturnAdjustment.isEmpty() && |
| 1548 | "Destructor can't have return adjustment!"); |
Anders Carlsson | 49bac9a | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1549 | |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1550 | // Add both the complete destructor and the deleting destructor. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1551 | Components.push_back(VTableComponent::MakeCompleteDtor(DD)); |
| 1552 | Components.push_back(VTableComponent::MakeDeletingDtor(DD)); |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1553 | } else { |
| 1554 | // Add the return adjustment if necessary. |
| 1555 | if (!ReturnAdjustment.isEmpty()) |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1556 | VTableThunks[Components.size()].Return = ReturnAdjustment; |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1557 | |
| 1558 | // Add the function. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1559 | Components.push_back(VTableComponent::MakeFunction(MD)); |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1560 | } |
| 1561 | } |
| 1562 | |
Anders Carlsson | c784ba2 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1563 | /// OverridesIndirectMethodInBase - Return whether the given member function |
| 1564 | /// overrides any methods in the set of given bases. |
| 1565 | /// Unlike OverridesMethodInBase, this checks "overriders of overriders". |
| 1566 | /// For example, if we have: |
| 1567 | /// |
| 1568 | /// struct A { virtual void f(); } |
| 1569 | /// struct B : A { virtual void f(); } |
| 1570 | /// struct C : B { virtual void f(); } |
| 1571 | /// |
| 1572 | /// OverridesIndirectMethodInBase will return true if given C::f as the method |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1573 | /// and { A } as the set of bases. |
Anders Carlsson | c784ba2 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1574 | static bool |
| 1575 | OverridesIndirectMethodInBases(const CXXMethodDecl *MD, |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1576 | VTableBuilder::PrimaryBasesSetVectorTy &Bases) { |
Anders Carlsson | fbf0561 | 2010-04-17 17:24:33 +0000 | [diff] [blame] | 1577 | if (Bases.count(MD->getParent())) |
| 1578 | return true; |
| 1579 | |
Anders Carlsson | c784ba2 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1580 | for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), |
| 1581 | E = MD->end_overridden_methods(); I != E; ++I) { |
| 1582 | const CXXMethodDecl *OverriddenMD = *I; |
Anders Carlsson | c784ba2 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1583 | |
| 1584 | // Check "indirect overriders". |
| 1585 | if (OverridesIndirectMethodInBases(OverriddenMD, Bases)) |
| 1586 | return true; |
| 1587 | } |
| 1588 | |
| 1589 | return false; |
| 1590 | } |
| 1591 | |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1592 | bool |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1593 | VTableBuilder::IsOverriderUsed(const CXXMethodDecl *Overrider, |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1594 | uint64_t BaseOffsetInLayoutClass, |
| 1595 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1596 | uint64_t FirstBaseOffsetInLayoutClass) const { |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1597 | // If the base and the first base in the primary base chain have the same |
| 1598 | // offsets, then this overrider will be used. |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1599 | if (BaseOffsetInLayoutClass == FirstBaseOffsetInLayoutClass) |
Anders Carlsson | f9fbc71 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1600 | return true; |
| 1601 | |
| 1602 | // We know now that Base (or a direct or indirect base of it) is a primary |
| 1603 | // base in part of the class hierarchy, but not a primary base in the most |
| 1604 | // derived class. |
| 1605 | |
| 1606 | // If the overrider is the first base in the primary base chain, we know |
| 1607 | // that the overrider will be used. |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1608 | if (Overrider->getParent() == FirstBaseInPrimaryBaseChain) |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1609 | return true; |
| 1610 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1611 | VTableBuilder::PrimaryBasesSetVectorTy PrimaryBases; |
Anders Carlsson | f9fbc71 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1612 | |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1613 | const CXXRecordDecl *RD = FirstBaseInPrimaryBaseChain; |
Anders Carlsson | f9fbc71 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1614 | PrimaryBases.insert(RD); |
| 1615 | |
| 1616 | // Now traverse the base chain, starting with the first base, until we find |
| 1617 | // the base that is no longer a primary base. |
| 1618 | while (true) { |
| 1619 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1620 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 1621 | |
| 1622 | if (!PrimaryBase) |
| 1623 | break; |
| 1624 | |
| 1625 | if (Layout.getPrimaryBaseWasVirtual()) { |
| 1626 | assert(Layout.getVBaseClassOffset(PrimaryBase) == 0 && |
| 1627 | "Primary base should always be at offset 0!"); |
| 1628 | |
Anders Carlsson | dad0f99 | 2010-02-28 18:37:33 +0000 | [diff] [blame] | 1629 | const ASTRecordLayout &LayoutClassLayout = |
| 1630 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | f9fbc71 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1631 | |
| 1632 | // Now check if this is the primary base that is not a primary base in the |
| 1633 | // most derived class. |
Anders Carlsson | dad0f99 | 2010-02-28 18:37:33 +0000 | [diff] [blame] | 1634 | if (LayoutClassLayout.getVBaseClassOffset(PrimaryBase) != |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1635 | FirstBaseOffsetInLayoutClass) { |
Anders Carlsson | f9fbc71 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1636 | // We found it, stop walking the chain. |
| 1637 | break; |
| 1638 | } |
| 1639 | } else { |
| 1640 | assert(Layout.getBaseClassOffset(PrimaryBase) == 0 && |
| 1641 | "Primary base should always be at offset 0!"); |
| 1642 | } |
Anders Carlsson | cd4e637 | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1643 | |
Anders Carlsson | f89bb6c | 2010-02-27 19:51:04 +0000 | [diff] [blame] | 1644 | if (!PrimaryBases.insert(PrimaryBase)) |
| 1645 | assert(false && "Found a duplicate primary base!"); |
| 1646 | |
Anders Carlsson | cd4e637 | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1647 | RD = PrimaryBase; |
Anders Carlsson | f9fbc71 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1648 | } |
| 1649 | |
| 1650 | // If the final overrider is an override of one of the primary bases, |
| 1651 | // then we know that it will be used. |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1652 | return OverridesIndirectMethodInBases(Overrider, PrimaryBases); |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1653 | } |
| 1654 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1655 | /// FindNearestOverriddenMethod - Given a method, returns the overridden method |
| 1656 | /// from the nearest base. Returns null if no method was found. |
| 1657 | static const CXXMethodDecl * |
| 1658 | FindNearestOverriddenMethod(const CXXMethodDecl *MD, |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1659 | VTableBuilder::PrimaryBasesSetVectorTy &Bases) { |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1660 | OverriddenMethodsSetTy OverriddenMethods; |
| 1661 | ComputeAllOverriddenMethods(MD, OverriddenMethods); |
| 1662 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1663 | for (int I = Bases.size(), E = 0; I != E; --I) { |
| 1664 | const CXXRecordDecl *PrimaryBase = Bases[I - 1]; |
| 1665 | |
| 1666 | // Now check the overriden methods. |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1667 | for (OverriddenMethodsSetTy::const_iterator I = OverriddenMethods.begin(), |
| 1668 | E = OverriddenMethods.end(); I != E; ++I) { |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1669 | const CXXMethodDecl *OverriddenMD = *I; |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1670 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1671 | // We found our overridden method. |
| 1672 | if (OverriddenMD->getParent() == PrimaryBase) |
| 1673 | return OverriddenMD; |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | return 0; |
| 1678 | } |
| 1679 | |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1680 | void |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1681 | VTableBuilder::AddMethods(BaseSubobject Base, uint64_t BaseOffsetInLayoutClass, |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1682 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1683 | uint64_t FirstBaseOffsetInLayoutClass, |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1684 | PrimaryBasesSetVectorTy &PrimaryBases) { |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1685 | const CXXRecordDecl *RD = Base.getBase(); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1686 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1687 | |
| 1688 | if (const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase()) { |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1689 | uint64_t PrimaryBaseOffset; |
| 1690 | uint64_t PrimaryBaseOffsetInLayoutClass; |
Anders Carlsson | af280c0 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1691 | if (Layout.getPrimaryBaseWasVirtual()) { |
| 1692 | assert(Layout.getVBaseClassOffset(PrimaryBase) == 0 && |
| 1693 | "Primary vbase should have a zero offset!"); |
| 1694 | |
| 1695 | const ASTRecordLayout &MostDerivedClassLayout = |
| 1696 | Context.getASTRecordLayout(MostDerivedClass); |
| 1697 | |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1698 | PrimaryBaseOffset = |
| 1699 | MostDerivedClassLayout.getVBaseClassOffset(PrimaryBase); |
| 1700 | |
| 1701 | const ASTRecordLayout &LayoutClassLayout = |
| 1702 | Context.getASTRecordLayout(LayoutClass); |
| 1703 | |
| 1704 | PrimaryBaseOffsetInLayoutClass = |
| 1705 | LayoutClassLayout.getVBaseClassOffset(PrimaryBase); |
Anders Carlsson | af280c0 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1706 | } else { |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1707 | assert(Layout.getBaseClassOffset(PrimaryBase) == 0 && |
| 1708 | "Primary base should have a zero offset!"); |
Anders Carlsson | af280c0 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1709 | |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1710 | PrimaryBaseOffset = Base.getBaseOffset(); |
| 1711 | PrimaryBaseOffsetInLayoutClass = BaseOffsetInLayoutClass; |
Anders Carlsson | af280c0 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1712 | } |
Anders Carlsson | dad0f99 | 2010-02-28 18:37:33 +0000 | [diff] [blame] | 1713 | |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1714 | AddMethods(BaseSubobject(PrimaryBase, PrimaryBaseOffset), |
| 1715 | PrimaryBaseOffsetInLayoutClass, FirstBaseInPrimaryBaseChain, |
| 1716 | FirstBaseOffsetInLayoutClass, PrimaryBases); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1717 | |
| 1718 | if (!PrimaryBases.insert(PrimaryBase)) |
| 1719 | assert(false && "Found a duplicate primary base!"); |
| 1720 | } |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1721 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1722 | // Now go through all virtual member functions and add them. |
| 1723 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 1724 | E = RD->method_end(); I != E; ++I) { |
| 1725 | const CXXMethodDecl *MD = *I; |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1726 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1727 | if (!MD->isVirtual()) |
| 1728 | continue; |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1729 | |
| 1730 | // Get the final overrider. |
Anders Carlsson | a757582 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 1731 | FinalOverriders::OverriderInfo Overrider = |
Anders Carlsson | 2638764 | 2010-06-01 23:17:37 +0000 | [diff] [blame] | 1732 | Overriders.getOverrider(MD, Base.getBaseOffset()); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1733 | |
| 1734 | // Check if this virtual member function overrides a method in a primary |
| 1735 | // base. If this is the case, and the return type doesn't require adjustment |
| 1736 | // then we can just use the member function from the primary base. |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1737 | if (const CXXMethodDecl *OverriddenMD = |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1738 | FindNearestOverriddenMethod(MD, PrimaryBases)) { |
Anders Carlsson | df31af1 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 1739 | if (ComputeReturnAdjustmentBaseOffset(Context, MD, |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1740 | OverriddenMD).isEmpty()) { |
| 1741 | // Replace the method info of the overridden method with our own |
| 1742 | // method. |
| 1743 | assert(MethodInfoMap.count(OverriddenMD) && |
| 1744 | "Did not find the overridden method!"); |
| 1745 | MethodInfo &OverriddenMethodInfo = MethodInfoMap[OverriddenMD]; |
| 1746 | |
| 1747 | MethodInfo MethodInfo(Base.getBaseOffset(), |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1748 | BaseOffsetInLayoutClass, |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1749 | OverriddenMethodInfo.VTableIndex); |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1750 | |
| 1751 | assert(!MethodInfoMap.count(MD) && |
| 1752 | "Should not have method info for this method yet!"); |
| 1753 | |
| 1754 | MethodInfoMap.insert(std::make_pair(MD, MethodInfo)); |
| 1755 | MethodInfoMap.erase(OverriddenMD); |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1756 | |
| 1757 | // If the overridden method exists in a virtual base class or a direct |
| 1758 | // or indirect base class of a virtual base class, we need to emit a |
| 1759 | // thunk if we ever have a class hierarchy where the base class is not |
| 1760 | // a primary base in the complete object. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1761 | if (!isBuildingConstructorVTable() && OverriddenMD != MD) { |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1762 | // Compute the this adjustment. |
| 1763 | ThisAdjustment ThisAdjustment = |
| 1764 | ComputeThisAdjustment(OverriddenMD, BaseOffsetInLayoutClass, |
| 1765 | Overrider); |
| 1766 | |
Anders Carlsson | acfa6ae | 2010-03-29 02:53:58 +0000 | [diff] [blame] | 1767 | if (ThisAdjustment.VCallOffsetOffset && |
| 1768 | Overrider.Method->getParent() == MostDerivedClass) { |
| 1769 | // This is a virtual thunk for the most derived class, add it. |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1770 | AddThunk(Overrider.Method, |
| 1771 | ThunkInfo(ThisAdjustment, ReturnAdjustment())); |
| 1772 | } |
| 1773 | } |
| 1774 | |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1775 | continue; |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1776 | } |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1777 | } |
Anders Carlsson | 0c0eeb2 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 1778 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1779 | // Insert the method info for this method. |
Anders Carlsson | 2bc1d3a | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1780 | MethodInfo MethodInfo(Base.getBaseOffset(), BaseOffsetInLayoutClass, |
| 1781 | Components.size()); |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1782 | |
| 1783 | assert(!MethodInfoMap.count(MD) && |
| 1784 | "Should not have method info for this method yet!"); |
| 1785 | MethodInfoMap.insert(std::make_pair(MD, MethodInfo)); |
Anders Carlsson | cd4e637 | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1786 | |
| 1787 | // Check if this overrider is going to be used. |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1788 | const CXXMethodDecl *OverriderMD = Overrider.Method; |
| 1789 | if (!IsOverriderUsed(OverriderMD, BaseOffsetInLayoutClass, |
| 1790 | FirstBaseInPrimaryBaseChain, |
| 1791 | FirstBaseOffsetInLayoutClass)) { |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1792 | Components.push_back(VTableComponent::MakeUnusedFunction(OverriderMD)); |
Anders Carlsson | cd4e637 | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1793 | continue; |
| 1794 | } |
Anders Carlsson | 464c8f1 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1795 | |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1796 | // Check if this overrider needs a return adjustment. |
Anders Carlsson | 7097e75 | 2010-06-01 23:47:05 +0000 | [diff] [blame] | 1797 | // We don't want to do this for pure virtual member functions. |
| 1798 | BaseOffset ReturnAdjustmentOffset; |
| 1799 | if (!OverriderMD->isPure()) { |
| 1800 | ReturnAdjustmentOffset = |
| 1801 | ComputeReturnAdjustmentBaseOffset(Context, OverriderMD, MD); |
| 1802 | } |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1803 | |
| 1804 | ReturnAdjustment ReturnAdjustment = |
| 1805 | ComputeReturnAdjustment(ReturnAdjustmentOffset); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1806 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1807 | AddMethod(Overrider.Method, ReturnAdjustment); |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1808 | } |
| 1809 | } |
| 1810 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1811 | void VTableBuilder::LayoutVTable() { |
| 1812 | LayoutPrimaryAndSecondaryVTables(BaseSubobject(MostDerivedClass, 0), |
Anders Carlsson | 73e6fa0 | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1813 | /*BaseIsMorallyVirtual=*/false, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1814 | MostDerivedClassIsVirtual, |
| 1815 | MostDerivedClassOffset); |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1816 | |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1817 | VisitedVirtualBasesSetTy VBases; |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1818 | |
| 1819 | // Determine the primary virtual bases. |
Anders Carlsson | d7fdae5 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1820 | DeterminePrimaryVirtualBases(MostDerivedClass, MostDerivedClassOffset, |
| 1821 | VBases); |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1822 | VBases.clear(); |
| 1823 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1824 | LayoutVTablesForVirtualBases(MostDerivedClass, VBases); |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1825 | } |
| 1826 | |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1827 | void |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1828 | VTableBuilder::LayoutPrimaryAndSecondaryVTables(BaseSubobject Base, |
Anders Carlsson | 73e6fa0 | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1829 | bool BaseIsMorallyVirtual, |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1830 | bool BaseIsVirtualInLayoutClass, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1831 | uint64_t OffsetInLayoutClass) { |
Chris Lattner | 04a2311 | 2010-02-17 21:42:34 +0000 | [diff] [blame] | 1832 | assert(Base.getBase()->isDynamicClass() && "class does not have a vtable!"); |
Anders Carlsson | b828afa | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 1833 | |
Anders Carlsson | 852213e | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 1834 | // Add vcall and vbase offsets for this vtable. |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1835 | VCallAndVBaseOffsetBuilder Builder(MostDerivedClass, LayoutClass, &Overriders, |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1836 | Base, BaseIsVirtualInLayoutClass, |
| 1837 | OffsetInLayoutClass); |
Anders Carlsson | d68c083 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1838 | Components.append(Builder.components_begin(), Builder.components_end()); |
| 1839 | |
Anders Carlsson | dba6ef8 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 1840 | // Check if we need to add these vcall offsets. |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1841 | if (BaseIsVirtualInLayoutClass && !Builder.getVCallOffsets().empty()) { |
Anders Carlsson | dba6ef8 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 1842 | VCallOffsetMap &VCallOffsets = VCallOffsetsForVBases[Base.getBase()]; |
| 1843 | |
| 1844 | if (VCallOffsets.empty()) |
| 1845 | VCallOffsets = Builder.getVCallOffsets(); |
| 1846 | } |
| 1847 | |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 1848 | // If we're laying out the most derived class we want to keep track of the |
| 1849 | // virtual base class offset offsets. |
| 1850 | if (Base.getBase() == MostDerivedClass) |
| 1851 | VBaseOffsetOffsets = Builder.getVBaseOffsetOffsets(); |
| 1852 | |
Anders Carlsson | 852213e | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 1853 | // Add the offset to top. |
Anders Carlsson | e67dc30 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 1854 | // FIXME: We should not use / 8 here. |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1855 | int64_t OffsetToTop = -(int64_t)(OffsetInLayoutClass - |
| 1856 | MostDerivedClassOffset) / 8; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1857 | Components.push_back(VTableComponent::MakeOffsetToTop(OffsetToTop)); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1858 | |
| 1859 | // Next, add the RTTI. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1860 | Components.push_back(VTableComponent::MakeRTTI(MostDerivedClass)); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1861 | |
Anders Carlsson | 28cbc8b | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 1862 | uint64_t AddressPoint = Components.size(); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1863 | |
| 1864 | // Now go through all virtual member functions and add them. |
Anders Carlsson | b9021e9 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1865 | PrimaryBasesSetVectorTy PrimaryBases; |
Anders Carlsson | 6039661 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1866 | AddMethods(Base, OffsetInLayoutClass, Base.getBase(), OffsetInLayoutClass, |
| 1867 | PrimaryBases); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1868 | |
Anders Carlsson | 2ef9d6b | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1869 | // Compute 'this' pointer adjustments. |
| 1870 | ComputeThisAdjustments(); |
| 1871 | |
Anders Carlsson | 014a358 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1872 | // Add all address points. |
| 1873 | const CXXRecordDecl *RD = Base.getBase(); |
| 1874 | while (true) { |
| 1875 | AddressPoints.insert(std::make_pair(BaseSubobject(RD, OffsetInLayoutClass), |
| 1876 | AddressPoint)); |
| 1877 | |
| 1878 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1879 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
Anders Carlsson | 28cbc8b | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 1880 | |
Anders Carlsson | 014a358 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1881 | if (!PrimaryBase) |
| 1882 | break; |
| 1883 | |
| 1884 | if (Layout.getPrimaryBaseWasVirtual()) { |
| 1885 | // Check if this virtual primary base is a primary base in the layout |
| 1886 | // class. If it's not, we don't want to add it. |
| 1887 | const ASTRecordLayout &LayoutClassLayout = |
| 1888 | Context.getASTRecordLayout(LayoutClass); |
| 1889 | |
| 1890 | if (LayoutClassLayout.getVBaseClassOffset(PrimaryBase) != |
| 1891 | OffsetInLayoutClass) { |
| 1892 | // We don't want to add this class (or any of its primary bases). |
| 1893 | break; |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | RD = PrimaryBase; |
Anders Carlsson | 28cbc8b | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 1898 | } |
| 1899 | |
Anders Carlsson | 5edcc37 | 2010-02-24 16:43:12 +0000 | [diff] [blame] | 1900 | // Layout secondary vtables. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1901 | LayoutSecondaryVTables(Base, BaseIsMorallyVirtual, OffsetInLayoutClass); |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1902 | } |
| 1903 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1904 | void VTableBuilder::LayoutSecondaryVTables(BaseSubobject Base, |
Anders Carlsson | a96a2e9 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1905 | bool BaseIsMorallyVirtual, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1906 | uint64_t OffsetInLayoutClass) { |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1907 | // Itanium C++ ABI 2.5.2: |
| 1908 | // Following the primary virtual table of a derived class are secondary |
| 1909 | // virtual tables for each of its proper base classes, except any primary |
| 1910 | // base(s) with which it shares its primary virtual table. |
| 1911 | |
| 1912 | const CXXRecordDecl *RD = Base.getBase(); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1913 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1914 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1915 | |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1916 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1917 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1918 | // Ignore virtual bases, we'll emit them later. |
| 1919 | if (I->isVirtual()) |
| 1920 | continue; |
| 1921 | |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1922 | const CXXRecordDecl *BaseDecl = |
| 1923 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
Anders Carlsson | b828afa | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 1924 | |
Anders Carlsson | a661a54 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 1925 | // Ignore bases that don't have a vtable. |
| 1926 | if (!BaseDecl->isDynamicClass()) |
| 1927 | continue; |
Anders Carlsson | b828afa | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 1928 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1929 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | f2c98ce | 2010-03-10 19:15:26 +0000 | [diff] [blame] | 1930 | // Itanium C++ ABI 2.6.4: |
| 1931 | // Some of the base class subobjects may not need construction virtual |
| 1932 | // tables, which will therefore not be present in the construction |
| 1933 | // virtual table group, even though the subobject virtual tables are |
| 1934 | // present in the main virtual table group for the complete object. |
Anders Carlsson | a96a2e9 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1935 | if (!BaseIsMorallyVirtual && !BaseDecl->getNumVBases()) |
Anders Carlsson | f2c98ce | 2010-03-10 19:15:26 +0000 | [diff] [blame] | 1936 | continue; |
Anders Carlsson | f2c98ce | 2010-03-10 19:15:26 +0000 | [diff] [blame] | 1937 | } |
| 1938 | |
Anders Carlsson | 76f1aa7 | 2010-02-13 22:05:23 +0000 | [diff] [blame] | 1939 | // Get the base offset of this base. |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1940 | uint64_t RelativeBaseOffset = Layout.getBaseClassOffset(BaseDecl); |
| 1941 | uint64_t BaseOffset = Base.getBaseOffset() + RelativeBaseOffset; |
| 1942 | |
| 1943 | uint64_t BaseOffsetInLayoutClass = OffsetInLayoutClass + RelativeBaseOffset; |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1944 | |
| 1945 | // Don't emit a secondary vtable for a primary base. We might however want |
| 1946 | // to emit secondary vtables for other bases of this base. |
| 1947 | if (BaseDecl == PrimaryBase) { |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1948 | LayoutSecondaryVTables(BaseSubobject(BaseDecl, BaseOffset), |
Anders Carlsson | a96a2e9 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1949 | BaseIsMorallyVirtual, BaseOffsetInLayoutClass); |
Anders Carlsson | c7b6316 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1950 | continue; |
| 1951 | } |
Anders Carlsson | 76f1aa7 | 2010-02-13 22:05:23 +0000 | [diff] [blame] | 1952 | |
Anders Carlsson | 89ad421 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1953 | // Layout the primary vtable (and any secondary vtables) for this base. |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1954 | LayoutPrimaryAndSecondaryVTables(BaseSubobject(BaseDecl, BaseOffset), |
Anders Carlsson | 73e6fa0 | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1955 | BaseIsMorallyVirtual, |
Anders Carlsson | 9123284 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1956 | /*BaseIsVirtualInLayoutClass=*/false, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1957 | BaseOffsetInLayoutClass); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1958 | } |
| 1959 | } |
| 1960 | |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1961 | void |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1962 | VTableBuilder::DeterminePrimaryVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | d7fdae5 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1963 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1964 | VisitedVirtualBasesSetTy &VBases) { |
| 1965 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1966 | |
| 1967 | // Check if this base has a primary base. |
| 1968 | if (const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase()) { |
Anders Carlsson | 0378bf0 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1969 | |
| 1970 | // Check if it's virtual. |
| 1971 | if (Layout.getPrimaryBaseWasVirtual()) { |
| 1972 | bool IsPrimaryVirtualBase = true; |
| 1973 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1974 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | 0378bf0 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1975 | // Check if the base is actually a primary base in the class we use for |
| 1976 | // layout. |
Anders Carlsson | d7fdae5 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1977 | const ASTRecordLayout &LayoutClassLayout = |
| 1978 | Context.getASTRecordLayout(LayoutClass); |
| 1979 | |
| 1980 | uint64_t PrimaryBaseOffsetInLayoutClass = |
| 1981 | LayoutClassLayout.getVBaseClassOffset(PrimaryBase); |
| 1982 | |
| 1983 | // We know that the base is not a primary base in the layout class if |
| 1984 | // the base offsets are different. |
| 1985 | if (PrimaryBaseOffsetInLayoutClass != OffsetInLayoutClass) |
Anders Carlsson | 0378bf0 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1986 | IsPrimaryVirtualBase = false; |
| 1987 | } |
| 1988 | |
| 1989 | if (IsPrimaryVirtualBase) |
| 1990 | PrimaryVirtualBases.insert(PrimaryBase); |
| 1991 | } |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1992 | } |
| 1993 | |
| 1994 | // Traverse bases, looking for more primary virtual bases. |
| 1995 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1996 | E = RD->bases_end(); I != E; ++I) { |
| 1997 | const CXXRecordDecl *BaseDecl = |
| 1998 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 1999 | |
Anders Carlsson | d7fdae5 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 2000 | uint64_t BaseOffsetInLayoutClass; |
| 2001 | |
| 2002 | if (I->isVirtual()) { |
| 2003 | if (!VBases.insert(BaseDecl)) |
| 2004 | continue; |
| 2005 | |
| 2006 | const ASTRecordLayout &LayoutClassLayout = |
| 2007 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 2008 | |
Anders Carlsson | d7fdae5 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 2009 | BaseOffsetInLayoutClass = LayoutClassLayout.getVBaseClassOffset(BaseDecl); |
| 2010 | } else { |
| 2011 | BaseOffsetInLayoutClass = |
| 2012 | OffsetInLayoutClass + Layout.getBaseClassOffset(BaseDecl); |
| 2013 | } |
| 2014 | |
| 2015 | DeterminePrimaryVirtualBases(BaseDecl, BaseOffsetInLayoutClass, VBases); |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 2016 | } |
| 2017 | } |
| 2018 | |
| 2019 | void |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 2020 | VTableBuilder::LayoutVTablesForVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 2021 | VisitedVirtualBasesSetTy &VBases) { |
| 2022 | // Itanium C++ ABI 2.5.2: |
| 2023 | // Then come the virtual base virtual tables, also in inheritance graph |
| 2024 | // order, and again excluding primary bases (which share virtual tables with |
| 2025 | // the classes for which they are primary). |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 2026 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 2027 | E = RD->bases_end(); I != E; ++I) { |
| 2028 | const CXXRecordDecl *BaseDecl = |
| 2029 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 2030 | |
Anders Carlsson | af280c0 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 2031 | // Check if this base needs a vtable. (If it's virtual, not a primary base |
| 2032 | // of some other class, and we haven't visited it before). |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 2033 | if (I->isVirtual() && BaseDecl->isDynamicClass() && |
Anders Carlsson | 08c2675 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 2034 | !PrimaryVirtualBases.count(BaseDecl) && VBases.insert(BaseDecl)) { |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 2035 | const ASTRecordLayout &MostDerivedClassLayout = |
| 2036 | Context.getASTRecordLayout(MostDerivedClass); |
| 2037 | uint64_t BaseOffset = |
| 2038 | MostDerivedClassLayout.getVBaseClassOffset(BaseDecl); |
| 2039 | |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 2040 | const ASTRecordLayout &LayoutClassLayout = |
| 2041 | Context.getASTRecordLayout(LayoutClass); |
| 2042 | uint64_t BaseOffsetInLayoutClass = |
| 2043 | LayoutClassLayout.getVBaseClassOffset(BaseDecl); |
| 2044 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 2045 | LayoutPrimaryAndSecondaryVTables(BaseSubobject(BaseDecl, BaseOffset), |
Anders Carlsson | 73e6fa0 | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 2046 | /*BaseIsMorallyVirtual=*/true, |
| 2047 | /*BaseIsVirtualInLayoutClass=*/true, |
Anders Carlsson | 530c40c | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 2048 | BaseOffsetInLayoutClass); |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 2049 | } |
| 2050 | |
| 2051 | // We only need to check the base for virtual base vtables if it actually |
| 2052 | // has virtual bases. |
| 2053 | if (BaseDecl->getNumVBases()) |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 2054 | LayoutVTablesForVirtualBases(BaseDecl, VBases); |
Anders Carlsson | 69dc04e | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 2055 | } |
| 2056 | } |
| 2057 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2058 | /// dumpLayout - Dump the vtable layout. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2059 | void VTableBuilder::dumpLayout(llvm::raw_ostream& Out) { |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 2060 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 2061 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 2062 | Out << "Construction vtable for ('"; |
| 2063 | Out << MostDerivedClass->getQualifiedNameAsString() << "', "; |
| 2064 | // FIXME: Don't use / 8 . |
| 2065 | Out << MostDerivedClassOffset / 8 << ") in '"; |
| 2066 | Out << LayoutClass->getQualifiedNameAsString(); |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2067 | } else { |
| 2068 | Out << "Vtable for '"; |
| 2069 | Out << MostDerivedClass->getQualifiedNameAsString(); |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 2070 | } |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2071 | Out << "' (" << Components.size() << " entries).\n"; |
| 2072 | |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2073 | // Iterate through the address points and insert them into a new map where |
| 2074 | // they are keyed by the index and not the base object. |
| 2075 | // Since an address point can be shared by multiple subobjects, we use an |
| 2076 | // STL multimap. |
| 2077 | std::multimap<uint64_t, BaseSubobject> AddressPointsByIndex; |
Anders Carlsson | ff143f8 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 2078 | for (AddressPointsMapTy::const_iterator I = AddressPoints.begin(), |
| 2079 | E = AddressPoints.end(); I != E; ++I) { |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2080 | const BaseSubobject& Base = I->first; |
| 2081 | uint64_t Index = I->second; |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2082 | |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2083 | AddressPointsByIndex.insert(std::make_pair(Index, Base)); |
| 2084 | } |
| 2085 | |
| 2086 | for (unsigned I = 0, E = Components.size(); I != E; ++I) { |
Anders Carlsson | 28cbc8b | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 2087 | uint64_t Index = I; |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2088 | |
| 2089 | Out << llvm::format("%4d | ", I); |
| 2090 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2091 | const VTableComponent &Component = Components[I]; |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2092 | |
| 2093 | // Dump the component. |
| 2094 | switch (Component.getKind()) { |
Anders Carlsson | d9a6704 | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 2095 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2096 | case VTableComponent::CK_VCallOffset: |
Anders Carlsson | d9a6704 | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 2097 | Out << "vcall_offset (" << Component.getVCallOffset() << ")"; |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2098 | break; |
Anders Carlsson | 852213e | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 2099 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2100 | case VTableComponent::CK_VBaseOffset: |
Anders Carlsson | 852213e | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 2101 | Out << "vbase_offset (" << Component.getVBaseOffset() << ")"; |
| 2102 | break; |
| 2103 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2104 | case VTableComponent::CK_OffsetToTop: |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2105 | Out << "offset_to_top (" << Component.getOffsetToTop() << ")"; |
| 2106 | break; |
| 2107 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2108 | case VTableComponent::CK_RTTI: |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2109 | Out << Component.getRTTIDecl()->getQualifiedNameAsString() << " RTTI"; |
| 2110 | break; |
| 2111 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2112 | case VTableComponent::CK_FunctionPointer: { |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2113 | const CXXMethodDecl *MD = Component.getFunctionDecl(); |
| 2114 | |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 2115 | std::string Str = |
| 2116 | PredefinedExpr::ComputeName(PredefinedExpr::PrettyFunctionNoVirtual, |
| 2117 | MD); |
| 2118 | Out << Str; |
Anders Carlsson | 9824142 | 2010-02-12 02:38:13 +0000 | [diff] [blame] | 2119 | if (MD->isPure()) |
| 2120 | Out << " [pure]"; |
| 2121 | |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2122 | ThunkInfo Thunk = VTableThunks.lookup(I); |
Anders Carlsson | dd36681 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2123 | if (!Thunk.isEmpty()) { |
| 2124 | // If this function pointer has a return adjustment, dump it. |
| 2125 | if (!Thunk.Return.isEmpty()) { |
| 2126 | Out << "\n [return adjustment: "; |
| 2127 | Out << Thunk.Return.NonVirtual << " non-virtual"; |
| 2128 | |
| 2129 | if (Thunk.Return.VBaseOffsetOffset) { |
| 2130 | Out << ", " << Thunk.Return.VBaseOffsetOffset; |
| 2131 | Out << " vbase offset offset"; |
| 2132 | } |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 2133 | |
Anders Carlsson | dd36681 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2134 | Out << ']'; |
| 2135 | } |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 2136 | |
Anders Carlsson | dd36681 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2137 | // If this function pointer has a 'this' pointer adjustment, dump it. |
| 2138 | if (!Thunk.This.isEmpty()) { |
| 2139 | Out << "\n [this adjustment: "; |
| 2140 | Out << Thunk.This.NonVirtual << " non-virtual"; |
| 2141 | |
| 2142 | if (Thunk.This.VCallOffsetOffset) { |
| 2143 | Out << ", " << Thunk.This.VCallOffsetOffset; |
| 2144 | Out << " vcall offset offset"; |
| 2145 | } |
Anders Carlsson | 60cc72a | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 2146 | |
Anders Carlsson | dd36681 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2147 | Out << ']'; |
| 2148 | } |
Anders Carlsson | 49bac9a | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 2149 | } |
Anders Carlsson | 7dbf47a | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 2150 | |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 2151 | break; |
| 2152 | } |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2153 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2154 | case VTableComponent::CK_CompleteDtorPointer: |
| 2155 | case VTableComponent::CK_DeletingDtorPointer: { |
Anders Carlsson | 6065e02 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2156 | bool IsComplete = |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2157 | Component.getKind() == VTableComponent::CK_CompleteDtorPointer; |
Anders Carlsson | 6065e02 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2158 | |
Anders Carlsson | 848fa64 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 2159 | const CXXDestructorDecl *DD = Component.getDestructorDecl(); |
| 2160 | |
Anders Carlsson | 6065e02 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2161 | Out << DD->getQualifiedNameAsString(); |
| 2162 | if (IsComplete) |
| 2163 | Out << "() [complete]"; |
| 2164 | else |
| 2165 | Out << "() [deleting]"; |
| 2166 | |
Anders Carlsson | 9824142 | 2010-02-12 02:38:13 +0000 | [diff] [blame] | 2167 | if (DD->isPure()) |
| 2168 | Out << " [pure]"; |
| 2169 | |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2170 | ThunkInfo Thunk = VTableThunks.lookup(I); |
Anders Carlsson | dd36681 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2171 | if (!Thunk.isEmpty()) { |
| 2172 | // If this destructor has a 'this' pointer adjustment, dump it. |
| 2173 | if (!Thunk.This.isEmpty()) { |
| 2174 | Out << "\n [this adjustment: "; |
| 2175 | Out << Thunk.This.NonVirtual << " non-virtual"; |
| 2176 | |
| 2177 | if (Thunk.This.VCallOffsetOffset) { |
| 2178 | Out << ", " << Thunk.This.VCallOffsetOffset; |
| 2179 | Out << " vcall offset offset"; |
| 2180 | } |
| 2181 | |
| 2182 | Out << ']'; |
| 2183 | } |
| 2184 | } |
Anders Carlsson | 6065e02 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2185 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2186 | break; |
| 2187 | } |
| 2188 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2189 | case VTableComponent::CK_UnusedFunctionPointer: { |
Anders Carlsson | 1f46466 | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 2190 | const CXXMethodDecl *MD = Component.getUnusedFunctionDecl(); |
| 2191 | |
| 2192 | std::string Str = |
| 2193 | PredefinedExpr::ComputeName(PredefinedExpr::PrettyFunctionNoVirtual, |
| 2194 | MD); |
| 2195 | Out << "[unused] " << Str; |
| 2196 | if (MD->isPure()) |
| 2197 | Out << " [pure]"; |
| 2198 | } |
| 2199 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2200 | } |
Anders Carlsson | 822307b | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2201 | |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2202 | Out << '\n'; |
Anders Carlsson | d2c3a7c | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2203 | |
| 2204 | // Dump the next address point. |
| 2205 | uint64_t NextIndex = Index + 1; |
| 2206 | if (AddressPointsByIndex.count(NextIndex)) { |
| 2207 | if (AddressPointsByIndex.count(NextIndex) == 1) { |
| 2208 | const BaseSubobject &Base = |
| 2209 | AddressPointsByIndex.find(NextIndex)->second; |
| 2210 | |
| 2211 | // FIXME: Instead of dividing by 8, we should be using CharUnits. |
| 2212 | Out << " -- (" << Base.getBase()->getQualifiedNameAsString(); |
| 2213 | Out << ", " << Base.getBaseOffset() / 8 << ") vtable address --\n"; |
| 2214 | } else { |
| 2215 | uint64_t BaseOffset = |
| 2216 | AddressPointsByIndex.lower_bound(NextIndex)->second.getBaseOffset(); |
| 2217 | |
| 2218 | // We store the class names in a set to get a stable order. |
| 2219 | std::set<std::string> ClassNames; |
| 2220 | for (std::multimap<uint64_t, BaseSubobject>::const_iterator I = |
| 2221 | AddressPointsByIndex.lower_bound(NextIndex), E = |
| 2222 | AddressPointsByIndex.upper_bound(NextIndex); I != E; ++I) { |
| 2223 | assert(I->second.getBaseOffset() == BaseOffset && |
| 2224 | "Invalid base offset!"); |
| 2225 | const CXXRecordDecl *RD = I->second.getBase(); |
| 2226 | ClassNames.insert(RD->getQualifiedNameAsString()); |
| 2227 | } |
| 2228 | |
| 2229 | for (std::set<std::string>::const_iterator I = ClassNames.begin(), |
| 2230 | E = ClassNames.end(); I != E; ++I) { |
| 2231 | // FIXME: Instead of dividing by 8, we should be using CharUnits. |
| 2232 | Out << " -- (" << *I; |
| 2233 | Out << ", " << BaseOffset / 8 << ") vtable address --\n"; |
| 2234 | } |
| 2235 | } |
| 2236 | } |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2237 | } |
Anders Carlsson | d03a326 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 2238 | |
| 2239 | Out << '\n'; |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2240 | |
Anders Carlsson | 718d069 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 2241 | if (isBuildingConstructorVTable()) |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2242 | return; |
| 2243 | |
| 2244 | if (MostDerivedClass->getNumVBases()) { |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2245 | // We store the virtual base class names and their offsets in a map to get |
| 2246 | // a stable order. |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2247 | |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2248 | std::map<std::string, int64_t> ClassNamesAndOffsets; |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2249 | for (VBaseOffsetOffsetsMapTy::const_iterator I = VBaseOffsetOffsets.begin(), |
| 2250 | E = VBaseOffsetOffsets.end(); I != E; ++I) { |
| 2251 | std::string ClassName = I->first->getQualifiedNameAsString(); |
| 2252 | int64_t OffsetOffset = I->second; |
| 2253 | ClassNamesAndOffsets.insert(std::make_pair(ClassName, OffsetOffset)); |
| 2254 | } |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2255 | |
| 2256 | Out << "Virtual base offset offsets for '"; |
| 2257 | Out << MostDerivedClass->getQualifiedNameAsString() << "' ("; |
| 2258 | Out << ClassNamesAndOffsets.size(); |
| 2259 | Out << (ClassNamesAndOffsets.size() == 1 ? " entry" : " entries") << ").\n"; |
Anders Carlsson | bb6305b | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2260 | |
| 2261 | for (std::map<std::string, int64_t>::const_iterator I = |
| 2262 | ClassNamesAndOffsets.begin(), E = ClassNamesAndOffsets.end(); |
| 2263 | I != E; ++I) |
| 2264 | Out << " " << I->first << " | " << I->second << '\n'; |
| 2265 | |
| 2266 | Out << "\n"; |
| 2267 | } |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2268 | |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2269 | if (!Thunks.empty()) { |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2270 | // We store the method names in a map to get a stable order. |
| 2271 | std::map<std::string, const CXXMethodDecl *> MethodNamesAndDecls; |
| 2272 | |
Anders Carlsson | ee5ab9f | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2273 | for (ThunksMapTy::const_iterator I = Thunks.begin(), E = Thunks.end(); |
Anders Carlsson | 3a5df3f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2274 | I != E; ++I) { |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2275 | const CXXMethodDecl *MD = I->first; |
| 2276 | std::string MethodName = |
| 2277 | PredefinedExpr::ComputeName(PredefinedExpr::PrettyFunctionNoVirtual, |
| 2278 | MD); |
| 2279 | |
| 2280 | MethodNamesAndDecls.insert(std::make_pair(MethodName, MD)); |
| 2281 | } |
| 2282 | |
| 2283 | for (std::map<std::string, const CXXMethodDecl *>::const_iterator I = |
| 2284 | MethodNamesAndDecls.begin(), E = MethodNamesAndDecls.end(); |
| 2285 | I != E; ++I) { |
| 2286 | const std::string &MethodName = I->first; |
| 2287 | const CXXMethodDecl *MD = I->second; |
Anders Carlsson | 87e0ac8 | 2010-03-22 16:30:44 +0000 | [diff] [blame] | 2288 | |
Anders Carlsson | ee5ab9f | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2289 | ThunkInfoVectorTy ThunksVector = Thunks[MD]; |
Anders Carlsson | 87e0ac8 | 2010-03-22 16:30:44 +0000 | [diff] [blame] | 2290 | std::sort(ThunksVector.begin(), ThunksVector.end()); |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2291 | |
| 2292 | Out << "Thunks for '" << MethodName << "' (" << ThunksVector.size(); |
| 2293 | Out << (ThunksVector.size() == 1 ? " entry" : " entries") << ").\n"; |
| 2294 | |
| 2295 | for (unsigned I = 0, E = ThunksVector.size(); I != E; ++I) { |
| 2296 | const ThunkInfo &Thunk = ThunksVector[I]; |
| 2297 | |
| 2298 | Out << llvm::format("%4d | ", I); |
| 2299 | |
Anders Carlsson | 09daa50 | 2010-03-22 16:10:59 +0000 | [diff] [blame] | 2300 | // If this function pointer has a return pointer adjustment, dump it. |
| 2301 | if (!Thunk.Return.isEmpty()) { |
| 2302 | Out << "return adjustment: " << Thunk.This.NonVirtual; |
| 2303 | Out << " non-virtual"; |
| 2304 | if (Thunk.Return.VBaseOffsetOffset) { |
| 2305 | Out << ", " << Thunk.Return.VBaseOffsetOffset; |
| 2306 | Out << " vbase offset offset"; |
| 2307 | } |
| 2308 | |
| 2309 | if (!Thunk.This.isEmpty()) |
| 2310 | Out << "\n "; |
| 2311 | } |
| 2312 | |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2313 | // If this function pointer has a 'this' pointer adjustment, dump it. |
| 2314 | if (!Thunk.This.isEmpty()) { |
Anders Carlsson | 09daa50 | 2010-03-22 16:10:59 +0000 | [diff] [blame] | 2315 | Out << "this adjustment: "; |
| 2316 | Out << Thunk.This.NonVirtual << " non-virtual"; |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2317 | |
| 2318 | if (Thunk.This.VCallOffsetOffset) { |
| 2319 | Out << ", " << Thunk.This.VCallOffsetOffset; |
Anders Carlsson | 09daa50 | 2010-03-22 16:10:59 +0000 | [diff] [blame] | 2320 | Out << " vcall offset offset"; |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2321 | } |
| 2322 | } |
| 2323 | |
| 2324 | Out << '\n'; |
| 2325 | } |
Anders Carlsson | bca5d37 | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 2326 | |
| 2327 | Out << '\n'; |
| 2328 | |
Anders Carlsson | 9135a84 | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2329 | } |
| 2330 | } |
Anders Carlsson | 824d7ea | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2331 | } |
| 2332 | |
| 2333 | } |
| 2334 | |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2335 | void CodeGenVTables::ComputeMethodVTableIndices(const CXXRecordDecl *RD) { |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2336 | |
| 2337 | // Itanium C++ ABI 2.5.2: |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 2338 | // The order of the virtual function pointers in a virtual table is the |
| 2339 | // order of declaration of the corresponding member functions in the class. |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2340 | // |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 2341 | // There is an entry for any virtual function declared in a class, |
| 2342 | // whether it is a new function or overrides a base class function, |
| 2343 | // unless it overrides a function from the primary base, and conversion |
| 2344 | // between their return types does not require an adjustment. |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2345 | |
| 2346 | int64_t CurrentIndex = 0; |
| 2347 | |
| 2348 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 2349 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 2350 | |
| 2351 | if (PrimaryBase) { |
Anders Carlsson | 0121fbd | 2009-11-30 19:43:26 +0000 | [diff] [blame] | 2352 | assert(PrimaryBase->isDefinition() && |
| 2353 | "Should have the definition decl of the primary base!"); |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2354 | |
| 2355 | // Since the record decl shares its vtable pointer with the primary base |
| 2356 | // we need to start counting at the end of the primary base's vtable. |
| 2357 | CurrentIndex = getNumVirtualFunctionPointers(PrimaryBase); |
| 2358 | } |
Eli Friedman | ea5ae31 | 2009-12-15 03:31:17 +0000 | [diff] [blame] | 2359 | |
| 2360 | // Collect all the primary bases, so we can check whether methods override |
| 2361 | // a method from the base. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2362 | VTableBuilder::PrimaryBasesSetVectorTy PrimaryBases; |
Eli Friedman | ea5ae31 | 2009-12-15 03:31:17 +0000 | [diff] [blame] | 2363 | for (ASTRecordLayout::primary_base_info_iterator |
| 2364 | I = Layout.primary_base_begin(), E = Layout.primary_base_end(); |
| 2365 | I != E; ++I) |
| 2366 | PrimaryBases.insert((*I).getBase()); |
| 2367 | |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2368 | const CXXDestructorDecl *ImplicitVirtualDtor = 0; |
| 2369 | |
| 2370 | for (CXXRecordDecl::method_iterator i = RD->method_begin(), |
| 2371 | e = RD->method_end(); i != e; ++i) { |
| 2372 | const CXXMethodDecl *MD = *i; |
| 2373 | |
| 2374 | // We only want virtual methods. |
| 2375 | if (!MD->isVirtual()) |
| 2376 | continue; |
| 2377 | |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2378 | // Check if this method overrides a method in the primary base. |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2379 | if (const CXXMethodDecl *OverriddenMD = |
Anders Carlsson | f622b45 | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 2380 | FindNearestOverriddenMethod(MD, PrimaryBases)) { |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2381 | // Check if converting from the return type of the method to the |
| 2382 | // return type of the overridden method requires conversion. |
Anders Carlsson | df31af1 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 2383 | if (ComputeReturnAdjustmentBaseOffset(CGM.getContext(), MD, |
| 2384 | OverriddenMD).isEmpty()) { |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2385 | // This index is shared between the index in the vtable of the primary |
| 2386 | // base class. |
| 2387 | if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) { |
| 2388 | const CXXDestructorDecl *OverriddenDD = |
| 2389 | cast<CXXDestructorDecl>(OverriddenMD); |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2390 | |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2391 | // Add both the complete and deleting entries. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2392 | MethodVTableIndices[GlobalDecl(DD, Dtor_Complete)] = |
| 2393 | getMethodVTableIndex(GlobalDecl(OverriddenDD, Dtor_Complete)); |
| 2394 | MethodVTableIndices[GlobalDecl(DD, Dtor_Deleting)] = |
| 2395 | getMethodVTableIndex(GlobalDecl(OverriddenDD, Dtor_Deleting)); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2396 | } else { |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2397 | MethodVTableIndices[MD] = getMethodVTableIndex(OverriddenMD); |
Anders Carlsson | 57071e2 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2398 | } |
| 2399 | |
| 2400 | // We don't need to add an entry for this method. |
Anders Carlsson | c1eec89 | 2010-02-12 18:14:46 +0000 | [diff] [blame] | 2401 | continue; |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2402 | } |
| 2403 | } |
| 2404 | |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2405 | if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) { |
| 2406 | if (MD->isImplicit()) { |
| 2407 | assert(!ImplicitVirtualDtor && |
| 2408 | "Did already see an implicit virtual dtor!"); |
| 2409 | ImplicitVirtualDtor = DD; |
| 2410 | continue; |
| 2411 | } |
| 2412 | |
| 2413 | // Add the complete dtor. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2414 | MethodVTableIndices[GlobalDecl(DD, Dtor_Complete)] = CurrentIndex++; |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2415 | |
| 2416 | // Add the deleting dtor. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2417 | MethodVTableIndices[GlobalDecl(DD, Dtor_Deleting)] = CurrentIndex++; |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2418 | } else { |
| 2419 | // Add the entry. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2420 | MethodVTableIndices[MD] = CurrentIndex++; |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2421 | } |
| 2422 | } |
| 2423 | |
| 2424 | if (ImplicitVirtualDtor) { |
| 2425 | // Itanium C++ ABI 2.5.2: |
Anders Carlsson | a661a54 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 2426 | // If a class has an implicitly-defined virtual destructor, |
| 2427 | // its entries come after the declared virtual function pointers. |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2428 | |
| 2429 | // Add the complete dtor. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2430 | MethodVTableIndices[GlobalDecl(ImplicitVirtualDtor, Dtor_Complete)] = |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2431 | CurrentIndex++; |
| 2432 | |
| 2433 | // Add the deleting dtor. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2434 | MethodVTableIndices[GlobalDecl(ImplicitVirtualDtor, Dtor_Deleting)] = |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2435 | CurrentIndex++; |
| 2436 | } |
| 2437 | |
| 2438 | NumVirtualFunctionPointers[RD] = CurrentIndex; |
| 2439 | } |
| 2440 | |
Anders Carlsson | af44035 | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 2441 | uint64_t CodeGenVTables::getNumVirtualFunctionPointers(const CXXRecordDecl *RD) { |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2442 | llvm::DenseMap<const CXXRecordDecl *, uint64_t>::iterator I = |
| 2443 | NumVirtualFunctionPointers.find(RD); |
| 2444 | if (I != NumVirtualFunctionPointers.end()) |
| 2445 | return I->second; |
| 2446 | |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2447 | ComputeMethodVTableIndices(RD); |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2448 | |
| 2449 | I = NumVirtualFunctionPointers.find(RD); |
| 2450 | assert(I != NumVirtualFunctionPointers.end() && "Did not find entry!"); |
| 2451 | return I->second; |
| 2452 | } |
| 2453 | |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2454 | uint64_t CodeGenVTables::getMethodVTableIndex(GlobalDecl GD) { |
| 2455 | MethodVTableIndicesTy::iterator I = MethodVTableIndices.find(GD); |
| 2456 | if (I != MethodVTableIndices.end()) |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2457 | return I->second; |
| 2458 | |
Anders Carlsson | a0fdd91 | 2009-11-13 17:08:56 +0000 | [diff] [blame] | 2459 | const CXXRecordDecl *RD = cast<CXXMethodDecl>(GD.getDecl())->getParent(); |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2460 | |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2461 | ComputeMethodVTableIndices(RD); |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2462 | |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2463 | I = MethodVTableIndices.find(GD); |
| 2464 | assert(I != MethodVTableIndices.end() && "Did not find index!"); |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2465 | return I->second; |
| 2466 | } |
| 2467 | |
Anders Carlsson | af44035 | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 2468 | int64_t CodeGenVTables::getVirtualBaseOffsetOffset(const CXXRecordDecl *RD, |
| 2469 | const CXXRecordDecl *VBase) { |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2470 | ClassPairTy ClassPair(RD, VBase); |
| 2471 | |
Anders Carlsson | bba1607 | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2472 | VirtualBaseClassOffsetOffsetsMapTy::iterator I = |
| 2473 | VirtualBaseClassOffsetOffsets.find(ClassPair); |
| 2474 | if (I != VirtualBaseClassOffsetOffsets.end()) |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2475 | return I->second; |
| 2476 | |
Anders Carlsson | c89a7cf | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 2477 | VCallAndVBaseOffsetBuilder Builder(RD, RD, /*FinalOverriders=*/0, |
| 2478 | BaseSubobject(RD, 0), |
| 2479 | /*BaseIsVirtual=*/false, |
| 2480 | /*OffsetInLayoutClass=*/0); |
Anders Carlsson | c89a7cf | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 2481 | |
| 2482 | for (VCallAndVBaseOffsetBuilder::VBaseOffsetOffsetsMapTy::const_iterator I = |
| 2483 | Builder.getVBaseOffsetOffsets().begin(), |
| 2484 | E = Builder.getVBaseOffsetOffsets().end(); I != E; ++I) { |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2485 | // Insert all types. |
| 2486 | ClassPairTy ClassPair(RD, I->first); |
| 2487 | |
Anders Carlsson | bba1607 | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2488 | VirtualBaseClassOffsetOffsets.insert(std::make_pair(ClassPair, I->second)); |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2489 | } |
| 2490 | |
Anders Carlsson | bba1607 | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2491 | I = VirtualBaseClassOffsetOffsets.find(ClassPair); |
Anders Carlsson | bba1607 | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2492 | assert(I != VirtualBaseClassOffsetOffsets.end() && "Did not find index!"); |
Anders Carlsson | dbd920c | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2493 | |
| 2494 | return I->second; |
| 2495 | } |
| 2496 | |
Anders Carlsson | 64c9eca | 2010-03-29 02:08:26 +0000 | [diff] [blame] | 2497 | uint64_t |
| 2498 | CodeGenVTables::getAddressPoint(BaseSubobject Base, const CXXRecordDecl *RD) { |
Anders Carlsson | ec9c202 | 2010-04-08 16:18:36 +0000 | [diff] [blame] | 2499 | assert(AddressPoints.count(std::make_pair(RD, Base)) && |
| 2500 | "Did not find address point!"); |
| 2501 | |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 2502 | uint64_t AddressPoint = AddressPoints.lookup(std::make_pair(RD, Base)); |
Anders Carlsson | 64c9eca | 2010-03-29 02:08:26 +0000 | [diff] [blame] | 2503 | assert(AddressPoint && "Address point must not be zero!"); |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 2504 | |
Anders Carlsson | 64c9eca | 2010-03-29 02:08:26 +0000 | [diff] [blame] | 2505 | return AddressPoint; |
| 2506 | } |
| 2507 | |
Anders Carlsson | 19879c9 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2508 | llvm::Constant *CodeGenModule::GetAddrOfThunk(GlobalDecl GD, |
| 2509 | const ThunkInfo &Thunk) { |
| 2510 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
| 2511 | |
| 2512 | // Compute the mangled name. |
| 2513 | llvm::SmallString<256> Name; |
| 2514 | if (const CXXDestructorDecl* DD = dyn_cast<CXXDestructorDecl>(MD)) |
| 2515 | getMangleContext().mangleCXXDtorThunk(DD, GD.getDtorType(), Thunk.This, |
| 2516 | Name); |
| 2517 | else |
| 2518 | getMangleContext().mangleThunk(MD, Thunk, Name); |
| 2519 | |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2520 | const llvm::Type *Ty = getTypes().GetFunctionTypeForVTable(MD); |
Chris Lattner | 7e21ffb | 2010-05-05 22:55:13 +0000 | [diff] [blame] | 2521 | return GetOrCreateLLVMFunction(Name, Ty, GD); |
Anders Carlsson | 19879c9 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2522 | } |
| 2523 | |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2524 | static llvm::Value *PerformTypeAdjustment(CodeGenFunction &CGF, |
| 2525 | llvm::Value *Ptr, |
| 2526 | int64_t NonVirtualAdjustment, |
| 2527 | int64_t VirtualAdjustment) { |
| 2528 | if (!NonVirtualAdjustment && !VirtualAdjustment) |
| 2529 | return Ptr; |
| 2530 | |
| 2531 | const llvm::Type *Int8PtrTy = |
| 2532 | llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 2533 | |
| 2534 | llvm::Value *V = CGF.Builder.CreateBitCast(Ptr, Int8PtrTy); |
| 2535 | |
| 2536 | if (NonVirtualAdjustment) { |
| 2537 | // Do the non-virtual adjustment. |
| 2538 | V = CGF.Builder.CreateConstInBoundsGEP1_64(V, NonVirtualAdjustment); |
| 2539 | } |
| 2540 | |
| 2541 | if (VirtualAdjustment) { |
| 2542 | const llvm::Type *PtrDiffTy = |
| 2543 | CGF.ConvertType(CGF.getContext().getPointerDiffType()); |
| 2544 | |
| 2545 | // Do the virtual adjustment. |
| 2546 | llvm::Value *VTablePtrPtr = |
| 2547 | CGF.Builder.CreateBitCast(V, Int8PtrTy->getPointerTo()); |
| 2548 | |
| 2549 | llvm::Value *VTablePtr = CGF.Builder.CreateLoad(VTablePtrPtr); |
| 2550 | |
| 2551 | llvm::Value *OffsetPtr = |
| 2552 | CGF.Builder.CreateConstInBoundsGEP1_64(VTablePtr, VirtualAdjustment); |
| 2553 | |
| 2554 | OffsetPtr = CGF.Builder.CreateBitCast(OffsetPtr, PtrDiffTy->getPointerTo()); |
| 2555 | |
| 2556 | // Load the adjustment offset from the vtable. |
| 2557 | llvm::Value *Offset = CGF.Builder.CreateLoad(OffsetPtr); |
| 2558 | |
| 2559 | // Adjust our pointer. |
| 2560 | V = CGF.Builder.CreateInBoundsGEP(V, Offset); |
| 2561 | } |
| 2562 | |
| 2563 | // Cast back to the original type. |
| 2564 | return CGF.Builder.CreateBitCast(V, Ptr->getType()); |
| 2565 | } |
| 2566 | |
| 2567 | void CodeGenFunction::GenerateThunk(llvm::Function *Fn, GlobalDecl GD, |
| 2568 | const ThunkInfo &Thunk) { |
| 2569 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
| 2570 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 2571 | QualType ResultType = FPT->getResultType(); |
| 2572 | QualType ThisType = MD->getThisType(getContext()); |
| 2573 | |
| 2574 | FunctionArgList FunctionArgs; |
| 2575 | |
| 2576 | // FIXME: It would be nice if more of this code could be shared with |
| 2577 | // CodeGenFunction::GenerateCode. |
| 2578 | |
| 2579 | // Create the implicit 'this' parameter declaration. |
| 2580 | CXXThisDecl = ImplicitParamDecl::Create(getContext(), 0, |
| 2581 | MD->getLocation(), |
| 2582 | &getContext().Idents.get("this"), |
| 2583 | ThisType); |
| 2584 | |
| 2585 | // Add the 'this' parameter. |
| 2586 | FunctionArgs.push_back(std::make_pair(CXXThisDecl, CXXThisDecl->getType())); |
| 2587 | |
| 2588 | // Add the rest of the parameters. |
| 2589 | for (FunctionDecl::param_const_iterator I = MD->param_begin(), |
| 2590 | E = MD->param_end(); I != E; ++I) { |
| 2591 | ParmVarDecl *Param = *I; |
| 2592 | |
| 2593 | FunctionArgs.push_back(std::make_pair(Param, Param->getType())); |
| 2594 | } |
| 2595 | |
| 2596 | StartFunction(GlobalDecl(), ResultType, Fn, FunctionArgs, SourceLocation()); |
| 2597 | |
| 2598 | // Adjust the 'this' pointer if necessary. |
| 2599 | llvm::Value *AdjustedThisPtr = |
| 2600 | PerformTypeAdjustment(*this, LoadCXXThis(), |
| 2601 | Thunk.This.NonVirtual, |
| 2602 | Thunk.This.VCallOffsetOffset); |
| 2603 | |
| 2604 | CallArgList CallArgs; |
| 2605 | |
| 2606 | // Add our adjusted 'this' pointer. |
| 2607 | CallArgs.push_back(std::make_pair(RValue::get(AdjustedThisPtr), ThisType)); |
| 2608 | |
| 2609 | // Add the rest of the parameters. |
| 2610 | for (FunctionDecl::param_const_iterator I = MD->param_begin(), |
| 2611 | E = MD->param_end(); I != E; ++I) { |
| 2612 | ParmVarDecl *Param = *I; |
| 2613 | QualType ArgType = Param->getType(); |
John McCall | 2736071 | 2010-05-26 22:34:26 +0000 | [diff] [blame] | 2614 | RValue Arg = EmitDelegateCallArg(Param); |
Douglas Gregor | 663218b | 2010-05-21 17:55:12 +0000 | [diff] [blame] | 2615 | |
| 2616 | CallArgs.push_back(std::make_pair(Arg, ArgType)); |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2617 | } |
| 2618 | |
| 2619 | // Get our callee. |
| 2620 | const llvm::Type *Ty = |
| 2621 | CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), |
| 2622 | FPT->isVariadic()); |
| 2623 | llvm::Value *Callee = CGM.GetAddrOfFunction(GD, Ty); |
| 2624 | |
| 2625 | const CGFunctionInfo &FnInfo = |
Rafael Espindola | 264ba48 | 2010-03-30 20:24:48 +0000 | [diff] [blame] | 2626 | CGM.getTypes().getFunctionInfo(ResultType, CallArgs, |
| 2627 | FPT->getExtInfo()); |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2628 | |
Douglas Gregor | cb359df | 2010-05-20 05:54:35 +0000 | [diff] [blame] | 2629 | // Determine whether we have a return value slot to use. |
| 2630 | ReturnValueSlot Slot; |
| 2631 | if (!ResultType->isVoidType() && |
| 2632 | FnInfo.getReturnInfo().getKind() == ABIArgInfo::Indirect && |
| 2633 | hasAggregateLLVMType(CurFnInfo->getReturnType())) |
| 2634 | Slot = ReturnValueSlot(ReturnValue, ResultType.isVolatileQualified()); |
| 2635 | |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2636 | // Now emit our call. |
Douglas Gregor | cb359df | 2010-05-20 05:54:35 +0000 | [diff] [blame] | 2637 | RValue RV = EmitCall(FnInfo, Callee, Slot, CallArgs, MD); |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2638 | |
| 2639 | if (!Thunk.Return.isEmpty()) { |
| 2640 | // Emit the return adjustment. |
| 2641 | bool NullCheckValue = !ResultType->isReferenceType(); |
| 2642 | |
| 2643 | llvm::BasicBlock *AdjustNull = 0; |
| 2644 | llvm::BasicBlock *AdjustNotNull = 0; |
| 2645 | llvm::BasicBlock *AdjustEnd = 0; |
| 2646 | |
| 2647 | llvm::Value *ReturnValue = RV.getScalarVal(); |
| 2648 | |
| 2649 | if (NullCheckValue) { |
| 2650 | AdjustNull = createBasicBlock("adjust.null"); |
| 2651 | AdjustNotNull = createBasicBlock("adjust.notnull"); |
| 2652 | AdjustEnd = createBasicBlock("adjust.end"); |
| 2653 | |
| 2654 | llvm::Value *IsNull = Builder.CreateIsNull(ReturnValue); |
| 2655 | Builder.CreateCondBr(IsNull, AdjustNull, AdjustNotNull); |
| 2656 | EmitBlock(AdjustNotNull); |
| 2657 | } |
| 2658 | |
| 2659 | ReturnValue = PerformTypeAdjustment(*this, ReturnValue, |
| 2660 | Thunk.Return.NonVirtual, |
| 2661 | Thunk.Return.VBaseOffsetOffset); |
| 2662 | |
| 2663 | if (NullCheckValue) { |
| 2664 | Builder.CreateBr(AdjustEnd); |
| 2665 | EmitBlock(AdjustNull); |
| 2666 | Builder.CreateBr(AdjustEnd); |
| 2667 | EmitBlock(AdjustEnd); |
| 2668 | |
| 2669 | llvm::PHINode *PHI = Builder.CreatePHI(ReturnValue->getType()); |
| 2670 | PHI->reserveOperandSpace(2); |
| 2671 | PHI->addIncoming(ReturnValue, AdjustNotNull); |
| 2672 | PHI->addIncoming(llvm::Constant::getNullValue(ReturnValue->getType()), |
| 2673 | AdjustNull); |
| 2674 | ReturnValue = PHI; |
| 2675 | } |
| 2676 | |
| 2677 | RV = RValue::get(ReturnValue); |
| 2678 | } |
| 2679 | |
Douglas Gregor | cb359df | 2010-05-20 05:54:35 +0000 | [diff] [blame] | 2680 | if (!ResultType->isVoidType() && Slot.isNull()) |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2681 | EmitReturnOfRValue(RV, ResultType); |
| 2682 | |
| 2683 | FinishFunction(); |
| 2684 | |
| 2685 | // Destroy the 'this' declaration. |
| 2686 | CXXThisDecl->Destroy(getContext()); |
| 2687 | |
| 2688 | // Set the right linkage. |
John McCall | 8b24233 | 2010-05-25 04:30:21 +0000 | [diff] [blame] | 2689 | CGM.setFunctionLinkage(MD, Fn); |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2690 | |
| 2691 | // Set the right visibility. |
| 2692 | CGM.setGlobalVisibility(Fn, MD); |
| 2693 | } |
| 2694 | |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2695 | void CodeGenVTables::EmitThunk(GlobalDecl GD, const ThunkInfo &Thunk) |
| 2696 | { |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2697 | llvm::Constant *Entry = CGM.GetAddrOfThunk(GD, Thunk); |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2698 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
Anders Carlsson | 19879c9 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2699 | |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2700 | // Strip off a bitcast if we got one back. |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2701 | if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2702 | assert(CE->getOpcode() == llvm::Instruction::BitCast); |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2703 | Entry = CE->getOperand(0); |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2704 | } |
| 2705 | |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2706 | // There's already a declaration with the same name, check if it has the same |
| 2707 | // type or if we need to replace it. |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2708 | if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2709 | CGM.getTypes().GetFunctionTypeForVTable(MD)) { |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2710 | llvm::GlobalValue *OldThunkFn = cast<llvm::GlobalValue>(Entry); |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2711 | |
| 2712 | // If the types mismatch then we have to rewrite the definition. |
| 2713 | assert(OldThunkFn->isDeclaration() && |
| 2714 | "Shouldn't replace non-declaration"); |
| 2715 | |
| 2716 | // Remove the name from the old thunk function and get a new thunk. |
| 2717 | OldThunkFn->setName(llvm::StringRef()); |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2718 | Entry = CGM.GetAddrOfThunk(GD, Thunk); |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2719 | |
| 2720 | // If needed, replace the old thunk with a bitcast. |
| 2721 | if (!OldThunkFn->use_empty()) { |
| 2722 | llvm::Constant *NewPtrForOldDecl = |
Anders Carlsson | 13d6898 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2723 | llvm::ConstantExpr::getBitCast(Entry, OldThunkFn->getType()); |
Anders Carlsson | 7986ad5 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2724 | OldThunkFn->replaceAllUsesWith(NewPtrForOldDecl); |
| 2725 | } |
| 2726 | |
| 2727 | // Remove the old thunk. |
| 2728 | OldThunkFn->eraseFromParent(); |
| 2729 | } |
Anders Carlsson | 519c328 | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2730 | |
| 2731 | // Actually generate the thunk body. |
| 2732 | llvm::Function *ThunkFn = cast<llvm::Function>(Entry); |
| 2733 | CodeGenFunction(CGM).GenerateThunk(ThunkFn, GD, Thunk); |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2734 | } |
| 2735 | |
Anders Carlsson | ee5ab9f | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2736 | void CodeGenVTables::EmitThunks(GlobalDecl GD) |
| 2737 | { |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2738 | const CXXMethodDecl *MD = |
| 2739 | cast<CXXMethodDecl>(GD.getDecl())->getCanonicalDecl(); |
| 2740 | |
| 2741 | // We don't need to generate thunks for the base destructor. |
| 2742 | if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base) |
| 2743 | return; |
| 2744 | |
| 2745 | const CXXRecordDecl *RD = MD->getParent(); |
| 2746 | |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2747 | // Compute VTable related info for this class. |
| 2748 | ComputeVTableRelatedInformation(RD); |
| 2749 | |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2750 | ThunksMapTy::const_iterator I = Thunks.find(MD); |
| 2751 | if (I == Thunks.end()) { |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2752 | // We did not find a thunk for this method. |
| 2753 | return; |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2754 | } |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2755 | |
Anders Carlsson | fbf6ed4 | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2756 | const ThunkInfoVectorTy &ThunkInfoVector = I->second; |
| 2757 | for (unsigned I = 0, E = ThunkInfoVector.size(); I != E; ++I) |
| 2758 | EmitThunk(GD, ThunkInfoVector[I]); |
Anders Carlsson | ee5ab9f | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2759 | } |
| 2760 | |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2761 | void CodeGenVTables::ComputeVTableRelatedInformation(const CXXRecordDecl *RD) { |
| 2762 | uint64_t *&LayoutData = VTableLayoutMap[RD]; |
| 2763 | |
| 2764 | // Check if we've computed this information before. |
| 2765 | if (LayoutData) |
| 2766 | return; |
Douglas Gregor | 6fb745b | 2010-05-13 16:44:06 +0000 | [diff] [blame] | 2767 | |
| 2768 | // We may need to generate a definition for this vtable. |
| 2769 | if (!isKeyFunctionInAnotherTU(CGM.getContext(), RD) && |
| 2770 | RD->getTemplateSpecializationKind() |
| 2771 | != TSK_ExplicitInstantiationDeclaration) |
| 2772 | CGM.DeferredVTables.push_back(RD); |
| 2773 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2774 | VTableBuilder Builder(*this, RD, 0, /*MostDerivedClassIsVirtual=*/0, RD); |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2775 | |
| 2776 | // Add the VTable layout. |
| 2777 | uint64_t NumVTableComponents = Builder.getNumVTableComponents(); |
| 2778 | LayoutData = new uint64_t[NumVTableComponents + 1]; |
| 2779 | |
| 2780 | // Store the number of components. |
| 2781 | LayoutData[0] = NumVTableComponents; |
| 2782 | |
| 2783 | // Store the components. |
| 2784 | std::copy(Builder.vtable_components_data_begin(), |
| 2785 | Builder.vtable_components_data_end(), |
| 2786 | &LayoutData[1]); |
| 2787 | |
| 2788 | // Add the known thunks. |
| 2789 | Thunks.insert(Builder.thunks_begin(), Builder.thunks_end()); |
| 2790 | |
Anders Carlsson | 276701f | 2010-03-29 01:38:05 +0000 | [diff] [blame] | 2791 | // Add the thunks needed in this vtable. |
| 2792 | assert(!VTableThunksMap.count(RD) && |
| 2793 | "Thunks already exists for this vtable!"); |
| 2794 | |
| 2795 | VTableThunksTy &VTableThunks = VTableThunksMap[RD]; |
| 2796 | VTableThunks.append(Builder.vtable_thunks_begin(), |
| 2797 | Builder.vtable_thunks_end()); |
| 2798 | |
| 2799 | // Sort them. |
| 2800 | std::sort(VTableThunks.begin(), VTableThunks.end()); |
| 2801 | |
Anders Carlsson | 66d567d | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 2802 | // Add the address points. |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2803 | for (VTableBuilder::AddressPointsMapTy::const_iterator I = |
Anders Carlsson | 66d567d | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 2804 | Builder.address_points_begin(), E = Builder.address_points_end(); |
| 2805 | I != E; ++I) { |
| 2806 | |
| 2807 | uint64_t &AddressPoint = AddressPoints[std::make_pair(RD, I->first)]; |
| 2808 | |
| 2809 | // Check if we already have the address points for this base. |
| 2810 | assert(!AddressPoint && "Address point already exists for this base!"); |
| 2811 | |
| 2812 | AddressPoint = I->second; |
| 2813 | } |
| 2814 | |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2815 | // If we don't have the vbase information for this class, insert it. |
| 2816 | // getVirtualBaseOffsetOffset will compute it separately without computing |
| 2817 | // the rest of the vtable related information. |
| 2818 | if (!RD->getNumVBases()) |
| 2819 | return; |
| 2820 | |
| 2821 | const RecordType *VBaseRT = |
| 2822 | RD->vbases_begin()->getType()->getAs<RecordType>(); |
| 2823 | const CXXRecordDecl *VBase = cast<CXXRecordDecl>(VBaseRT->getDecl()); |
| 2824 | |
| 2825 | if (VirtualBaseClassOffsetOffsets.count(std::make_pair(RD, VBase))) |
| 2826 | return; |
| 2827 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2828 | for (VTableBuilder::VBaseOffsetOffsetsMapTy::const_iterator I = |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2829 | Builder.getVBaseOffsetOffsets().begin(), |
| 2830 | E = Builder.getVBaseOffsetOffsets().end(); I != E; ++I) { |
| 2831 | // Insert all types. |
| 2832 | ClassPairTy ClassPair(RD, I->first); |
| 2833 | |
| 2834 | VirtualBaseClassOffsetOffsets.insert(std::make_pair(ClassPair, I->second)); |
| 2835 | } |
| 2836 | } |
| 2837 | |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2838 | llvm::Constant * |
| 2839 | CodeGenVTables::CreateVTableInitializer(const CXXRecordDecl *RD, |
| 2840 | const uint64_t *Components, |
| 2841 | unsigned NumComponents, |
| 2842 | const VTableThunksTy &VTableThunks) { |
| 2843 | llvm::SmallVector<llvm::Constant *, 64> Inits; |
| 2844 | |
| 2845 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
| 2846 | |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2847 | const llvm::Type *PtrDiffTy = |
| 2848 | CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType()); |
| 2849 | |
| 2850 | QualType ClassType = CGM.getContext().getTagDeclType(RD); |
| 2851 | llvm::Constant *RTTI = CGM.GetAddrOfRTTIDescriptor(ClassType); |
| 2852 | |
| 2853 | unsigned NextVTableThunkIndex = 0; |
| 2854 | |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2855 | llvm::Constant* PureVirtualFn = 0; |
| 2856 | |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2857 | for (unsigned I = 0; I != NumComponents; ++I) { |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2858 | VTableComponent Component = |
| 2859 | VTableComponent::getFromOpaqueInteger(Components[I]); |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2860 | |
| 2861 | llvm::Constant *Init = 0; |
| 2862 | |
| 2863 | switch (Component.getKind()) { |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2864 | case VTableComponent::CK_VCallOffset: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2865 | Init = llvm::ConstantInt::get(PtrDiffTy, Component.getVCallOffset()); |
| 2866 | Init = llvm::ConstantExpr::getIntToPtr(Init, Int8PtrTy); |
| 2867 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2868 | case VTableComponent::CK_VBaseOffset: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2869 | Init = llvm::ConstantInt::get(PtrDiffTy, Component.getVBaseOffset()); |
| 2870 | Init = llvm::ConstantExpr::getIntToPtr(Init, Int8PtrTy); |
| 2871 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2872 | case VTableComponent::CK_OffsetToTop: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2873 | Init = llvm::ConstantInt::get(PtrDiffTy, Component.getOffsetToTop()); |
| 2874 | Init = llvm::ConstantExpr::getIntToPtr(Init, Int8PtrTy); |
| 2875 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2876 | case VTableComponent::CK_RTTI: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2877 | Init = llvm::ConstantExpr::getBitCast(RTTI, Int8PtrTy); |
| 2878 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2879 | case VTableComponent::CK_FunctionPointer: |
| 2880 | case VTableComponent::CK_CompleteDtorPointer: |
| 2881 | case VTableComponent::CK_DeletingDtorPointer: { |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2882 | GlobalDecl GD; |
| 2883 | |
| 2884 | // Get the right global decl. |
| 2885 | switch (Component.getKind()) { |
| 2886 | default: |
| 2887 | llvm_unreachable("Unexpected vtable component kind"); |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2888 | case VTableComponent::CK_FunctionPointer: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2889 | GD = Component.getFunctionDecl(); |
| 2890 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2891 | case VTableComponent::CK_CompleteDtorPointer: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2892 | GD = GlobalDecl(Component.getDestructorDecl(), Dtor_Complete); |
| 2893 | break; |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2894 | case VTableComponent::CK_DeletingDtorPointer: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2895 | GD = GlobalDecl(Component.getDestructorDecl(), Dtor_Deleting); |
| 2896 | break; |
| 2897 | } |
| 2898 | |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2899 | if (cast<CXXMethodDecl>(GD.getDecl())->isPure()) { |
| 2900 | // We have a pure virtual member function. |
| 2901 | if (!PureVirtualFn) { |
| 2902 | const llvm::FunctionType *Ty = |
| 2903 | llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()), |
| 2904 | /*isVarArg=*/false); |
| 2905 | PureVirtualFn = |
| 2906 | CGM.CreateRuntimeFunction(Ty, "__cxa_pure_virtual"); |
| 2907 | PureVirtualFn = llvm::ConstantExpr::getBitCast(PureVirtualFn, |
| 2908 | Int8PtrTy); |
| 2909 | } |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2910 | |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2911 | Init = PureVirtualFn; |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2912 | } else { |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2913 | // Check if we should use a thunk. |
| 2914 | if (NextVTableThunkIndex < VTableThunks.size() && |
| 2915 | VTableThunks[NextVTableThunkIndex].first == I) { |
| 2916 | const ThunkInfo &Thunk = VTableThunks[NextVTableThunkIndex].second; |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2917 | |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2918 | Init = CGM.GetAddrOfThunk(GD, Thunk); |
| 2919 | |
| 2920 | NextVTableThunkIndex++; |
| 2921 | } else { |
| 2922 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2923 | const llvm::Type *Ty = CGM.getTypes().GetFunctionTypeForVTable(MD); |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2924 | |
| 2925 | Init = CGM.GetAddrOfFunction(GD, Ty); |
| 2926 | } |
| 2927 | |
| 2928 | Init = llvm::ConstantExpr::getBitCast(Init, Int8PtrTy); |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2929 | } |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2930 | break; |
| 2931 | } |
| 2932 | |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2933 | case VTableComponent::CK_UnusedFunctionPointer: |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2934 | Init = llvm::ConstantExpr::getNullValue(Int8PtrTy); |
| 2935 | break; |
| 2936 | }; |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2937 | |
| 2938 | Inits.push_back(Init); |
| 2939 | } |
| 2940 | |
| 2941 | llvm::ArrayType *ArrayType = llvm::ArrayType::get(Int8PtrTy, NumComponents); |
| 2942 | return llvm::ConstantArray::get(ArrayType, Inits.data(), Inits.size()); |
| 2943 | } |
| 2944 | |
| 2945 | /// GetGlobalVariable - Will return a global variable of the given type. |
| 2946 | /// If a variable with a different type already exists then a new variable |
| 2947 | /// with the right type will be created. |
| 2948 | /// FIXME: We should move this to CodeGenModule and rename it to something |
| 2949 | /// better and then use it in CGVTT and CGRTTI. |
| 2950 | static llvm::GlobalVariable * |
| 2951 | GetGlobalVariable(llvm::Module &Module, llvm::StringRef Name, |
| 2952 | const llvm::Type *Ty, |
| 2953 | llvm::GlobalValue::LinkageTypes Linkage) { |
| 2954 | |
| 2955 | llvm::GlobalVariable *GV = Module.getNamedGlobal(Name); |
| 2956 | llvm::GlobalVariable *OldGV = 0; |
| 2957 | |
| 2958 | if (GV) { |
| 2959 | // Check if the variable has the right type. |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2960 | if (GV->getType()->getElementType() == Ty) |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2961 | return GV; |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2962 | |
| 2963 | assert(GV->isDeclaration() && "Declaration has wrong type!"); |
| 2964 | |
| 2965 | OldGV = GV; |
| 2966 | } |
| 2967 | |
| 2968 | // Create a new variable. |
| 2969 | GV = new llvm::GlobalVariable(Module, Ty, /*isConstant=*/true, |
| 2970 | Linkage, 0, Name); |
| 2971 | |
| 2972 | if (OldGV) { |
| 2973 | // Replace occurrences of the old variable if needed. |
| 2974 | GV->takeName(OldGV); |
| 2975 | |
| 2976 | if (!OldGV->use_empty()) { |
| 2977 | llvm::Constant *NewPtrForOldDecl = |
| 2978 | llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); |
| 2979 | OldGV->replaceAllUsesWith(NewPtrForOldDecl); |
| 2980 | } |
| 2981 | |
| 2982 | OldGV->eraseFromParent(); |
| 2983 | } |
| 2984 | |
| 2985 | return GV; |
| 2986 | } |
| 2987 | |
Anders Carlsson | 9dc338a | 2010-03-30 03:35:35 +0000 | [diff] [blame] | 2988 | llvm::GlobalVariable *CodeGenVTables::GetAddrOfVTable(const CXXRecordDecl *RD) { |
Anders Carlsson | 5c6c1d9 | 2010-03-24 03:57:14 +0000 | [diff] [blame] | 2989 | llvm::SmallString<256> OutName; |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2990 | CGM.getMangleContext().mangleCXXVTable(RD, OutName); |
Anders Carlsson | 5c6c1d9 | 2010-03-24 03:57:14 +0000 | [diff] [blame] | 2991 | llvm::StringRef Name = OutName.str(); |
Mike Stump | 85615df | 2009-11-19 04:04:36 +0000 | [diff] [blame] | 2992 | |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2993 | ComputeVTableRelatedInformation(RD); |
| 2994 | |
Anders Carlsson | 5c6c1d9 | 2010-03-24 03:57:14 +0000 | [diff] [blame] | 2995 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
Anders Carlsson | ccd83d7 | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2996 | llvm::ArrayType *ArrayType = |
| 2997 | llvm::ArrayType::get(Int8PtrTy, getNumVTableComponents(RD)); |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 2998 | |
Anders Carlsson | 9dc338a | 2010-03-30 03:35:35 +0000 | [diff] [blame] | 2999 | return GetGlobalVariable(CGM.getModule(), Name, ArrayType, |
| 3000 | llvm::GlobalValue::ExternalLinkage); |
Mike Stump | 380dd75 | 2009-11-10 07:44:33 +0000 | [diff] [blame] | 3001 | } |
Mike Stump | 8cfcb52 | 2009-11-11 20:26:26 +0000 | [diff] [blame] | 3002 | |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3003 | void |
| 3004 | CodeGenVTables::EmitVTableDefinition(llvm::GlobalVariable *VTable, |
| 3005 | llvm::GlobalVariable::LinkageTypes Linkage, |
| 3006 | const CXXRecordDecl *RD) { |
| 3007 | // Dump the vtable layout if necessary. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3008 | if (CGM.getLangOptions().DumpVTableLayouts) { |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 3009 | VTableBuilder Builder(*this, RD, 0, /*MostDerivedClassIsVirtual=*/0, RD); |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3010 | |
| 3011 | Builder.dumpLayout(llvm::errs()); |
| 3012 | } |
| 3013 | |
| 3014 | assert(VTableThunksMap.count(RD) && |
| 3015 | "No thunk status for this record decl!"); |
| 3016 | |
| 3017 | const VTableThunksTy& Thunks = VTableThunksMap[RD]; |
| 3018 | |
| 3019 | // Create and set the initializer. |
| 3020 | llvm::Constant *Init = |
| 3021 | CreateVTableInitializer(RD, getVTableComponentsData(RD), |
| 3022 | getNumVTableComponents(RD), Thunks); |
| 3023 | VTable->setInitializer(Init); |
Anders Carlsson | 67d568a | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 3024 | |
| 3025 | // Set the correct linkage. |
| 3026 | VTable->setLinkage(Linkage); |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3027 | } |
| 3028 | |
Anders Carlsson | ff143f8 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 3029 | llvm::GlobalVariable * |
| 3030 | CodeGenVTables::GenerateConstructionVTable(const CXXRecordDecl *RD, |
Anders Carlsson | 2c822f1 | 2010-03-26 03:56:54 +0000 | [diff] [blame] | 3031 | const BaseSubobject &Base, |
| 3032 | bool BaseIsVirtual, |
| 3033 | VTableAddressPointsMapTy& AddressPoints) { |
Anders Carlsson | 9446481 | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 3034 | VTableBuilder Builder(*this, Base.getBase(), Base.getBaseOffset(), |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3035 | /*MostDerivedClassIsVirtual=*/BaseIsVirtual, RD); |
| 3036 | |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3037 | // Dump the vtable layout if necessary. |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3038 | if (CGM.getLangOptions().DumpVTableLayouts) |
Anders Carlsson | 6a5ab5d | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3039 | Builder.dumpLayout(llvm::errs()); |
| 3040 | |
| 3041 | // Add the address points. |
Anders Carlsson | 2c822f1 | 2010-03-26 03:56:54 +0000 | [diff] [blame] | 3042 | AddressPoints.insert(Builder.address_points_begin(), |
| 3043 | Builder.address_points_end()); |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3044 | |
| 3045 | // Get the mangled construction vtable name. |
| 3046 | llvm::SmallString<256> OutName; |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3047 | CGM.getMangleContext().mangleCXXCtorVTable(RD, Base.getBaseOffset() / 8, |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3048 | Base.getBase(), OutName); |
| 3049 | llvm::StringRef Name = OutName.str(); |
| 3050 | |
| 3051 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
| 3052 | llvm::ArrayType *ArrayType = |
| 3053 | llvm::ArrayType::get(Int8PtrTy, Builder.getNumVTableComponents()); |
| 3054 | |
| 3055 | // Create the variable that will hold the construction vtable. |
| 3056 | llvm::GlobalVariable *VTable = |
| 3057 | GetGlobalVariable(CGM.getModule(), Name, ArrayType, |
| 3058 | llvm::GlobalValue::InternalLinkage); |
| 3059 | |
| 3060 | // Add the thunks. |
| 3061 | VTableThunksTy VTableThunks; |
| 3062 | VTableThunks.append(Builder.vtable_thunks_begin(), |
| 3063 | Builder.vtable_thunks_end()); |
| 3064 | |
Anders Carlsson | aed924e | 2010-03-29 01:28:05 +0000 | [diff] [blame] | 3065 | // Sort them. |
| 3066 | std::sort(VTableThunks.begin(), VTableThunks.end()); |
| 3067 | |
Anders Carlsson | 0d1407e | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3068 | // Create and set the initializer. |
| 3069 | llvm::Constant *Init = |
| 3070 | CreateVTableInitializer(Base.getBase(), |
| 3071 | Builder.vtable_components_data_begin(), |
| 3072 | Builder.getNumVTableComponents(), VTableThunks); |
| 3073 | VTable->setInitializer(Init); |
| 3074 | |
Anders Carlsson | ff143f8 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 3075 | return VTable; |
| 3076 | } |
| 3077 | |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3078 | void |
| 3079 | CodeGenVTables::GenerateClassData(llvm::GlobalVariable::LinkageTypes Linkage, |
| 3080 | const CXXRecordDecl *RD) { |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3081 | llvm::GlobalVariable *&VTable = VTables[RD]; |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3082 | if (VTable) { |
Anders Carlsson | 046c294 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3083 | assert(VTable->getInitializer() && "VTable doesn't have a definition!"); |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3084 | return; |
| 3085 | } |
| 3086 | |
Anders Carlsson | 9dc338a | 2010-03-30 03:35:35 +0000 | [diff] [blame] | 3087 | VTable = GetAddrOfVTable(RD); |
| 3088 | EmitVTableDefinition(VTable, Linkage, RD); |
| 3089 | |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3090 | GenerateVTT(Linkage, /*GenerateDefinition=*/true, RD); |
Douglas Gregor | 1e201b4 | 2010-04-08 15:52:03 +0000 | [diff] [blame] | 3091 | |
| 3092 | // If this is the magic class __cxxabiv1::__fundamental_type_info, |
| 3093 | // we will emit the typeinfo for the fundamental types. This is the |
| 3094 | // same behaviour as GCC. |
| 3095 | const DeclContext *DC = RD->getDeclContext(); |
| 3096 | if (RD->getIdentifier() && |
| 3097 | RD->getIdentifier()->isStr("__fundamental_type_info") && |
| 3098 | isa<NamespaceDecl>(DC) && |
| 3099 | cast<NamespaceDecl>(DC)->getIdentifier() && |
| 3100 | cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__cxxabiv1") && |
| 3101 | DC->getParent()->isTranslationUnit()) |
| 3102 | CGM.EmitFundamentalRTTIDescriptors(); |
Anders Carlsson | a7cde3b | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3103 | } |