Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 1 | //===--- CGVTables.cpp - Emit LLVM Code for C++ vtables -------------------===// |
Anders Carlsson | 2bb27f5 | 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" |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 16 | #include "CGCXXABI.h" |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 17 | #include "clang/AST/CXXInheritance.h" |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 18 | #include "clang/AST/RecordLayout.h" |
John McCall | 5513fce9 | 2010-08-05 20:39:18 +0000 | [diff] [blame] | 19 | #include "clang/Frontend/CodeGenOptions.h" |
Anders Carlsson | d420a31 | 2009-11-26 19:32:45 +0000 | [diff] [blame] | 20 | #include "llvm/ADT/DenseSet.h" |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 21 | #include "llvm/ADT/SetVector.h" |
Chandler Carruth | 94eab4a | 2010-02-13 10:38:52 +0000 | [diff] [blame] | 22 | #include "llvm/Support/Compiler.h" |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 23 | #include "llvm/Support/Format.h" |
Anders Carlsson | 5644614 | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 24 | #include <algorithm> |
Zhongxing Xu | 1721ef7 | 2009-11-13 05:46:16 +0000 | [diff] [blame] | 25 | #include <cstdio> |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 26 | |
| 27 | using namespace clang; |
| 28 | using namespace CodeGen; |
| 29 | |
Anders Carlsson | d5988502 | 2009-11-27 22:21:51 +0000 | [diff] [blame] | 30 | namespace { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 31 | |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 32 | /// BaseOffset - Represents an offset from a derived class to a direct or |
| 33 | /// indirect base class. |
| 34 | struct BaseOffset { |
| 35 | /// DerivedClass - The derived class. |
| 36 | const CXXRecordDecl *DerivedClass; |
| 37 | |
| 38 | /// VirtualBase - If the path from the derived class to the base class |
| 39 | /// involves a virtual base class, this holds its declaration. |
| 40 | const CXXRecordDecl *VirtualBase; |
| 41 | |
| 42 | /// NonVirtualOffset - The offset from the derived class to the base class. |
| 43 | /// (Or the offset from the virtual base class to the base class, if the |
| 44 | /// path from the derived class to the base class involves a virtual base |
| 45 | /// class. |
| 46 | int64_t NonVirtualOffset; |
| 47 | |
| 48 | BaseOffset() : DerivedClass(0), VirtualBase(0), NonVirtualOffset(0) { } |
| 49 | BaseOffset(const CXXRecordDecl *DerivedClass, |
| 50 | const CXXRecordDecl *VirtualBase, int64_t NonVirtualOffset) |
| 51 | : DerivedClass(DerivedClass), VirtualBase(VirtualBase), |
| 52 | NonVirtualOffset(NonVirtualOffset) { } |
| 53 | |
| 54 | bool isEmpty() const { return !NonVirtualOffset && !VirtualBase; } |
| 55 | }; |
| 56 | |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 57 | /// FinalOverriders - Contains the final overrider member functions for all |
| 58 | /// member functions in the base subobjects of a class. |
| 59 | class FinalOverriders { |
Anders Carlsson | 136bd19 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 60 | public: |
| 61 | /// OverriderInfo - Information about a final overrider. |
| 62 | struct OverriderInfo { |
| 63 | /// Method - The method decl of the overrider. |
| 64 | const CXXMethodDecl *Method; |
Anders Carlsson | 5a7654a | 2010-02-18 16:29:24 +0000 | [diff] [blame] | 65 | |
Anders Carlsson | ca82a4f | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 66 | /// Offset - the base offset of the overrider in the layout class. |
Ken Dyck | 785cbdb | 2011-03-26 01:29:16 +0000 | [diff] [blame] | 67 | CharUnits Offset; |
Anders Carlsson | 136bd19 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 68 | |
Ken Dyck | 785cbdb | 2011-03-26 01:29:16 +0000 | [diff] [blame] | 69 | OverriderInfo() : Method(0), Offset(CharUnits::Zero()) { } |
Anders Carlsson | 136bd19 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | private: |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 73 | /// MostDerivedClass - The most derived class for which the final overriders |
| 74 | /// are stored. |
| 75 | const CXXRecordDecl *MostDerivedClass; |
| 76 | |
Anders Carlsson | ca82a4f | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 77 | /// MostDerivedClassOffset - If we're building final overriders for a |
| 78 | /// construction vtable, this holds the offset from the layout class to the |
| 79 | /// most derived class. |
| 80 | const uint64_t MostDerivedClassOffset; |
| 81 | |
| 82 | /// LayoutClass - The class we're using for layout information. Will be |
| 83 | /// different than the most derived class if the final overriders are for a |
| 84 | /// construction vtable. |
| 85 | const CXXRecordDecl *LayoutClass; |
| 86 | |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 87 | ASTContext &Context; |
| 88 | |
| 89 | /// MostDerivedClassLayout - the AST record layout of the most derived class. |
| 90 | const ASTRecordLayout &MostDerivedClassLayout; |
| 91 | |
Anders Carlsson | 04e51cc | 2010-06-01 23:52:26 +0000 | [diff] [blame] | 92 | /// MethodBaseOffsetPairTy - Uniquely identifies a member function |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 93 | /// in a base subobject. |
Ken Dyck | 808457c | 2011-03-26 01:18:17 +0000 | [diff] [blame] | 94 | typedef std::pair<const CXXMethodDecl *, CharUnits> MethodBaseOffsetPairTy; |
Anders Carlsson | 04e51cc | 2010-06-01 23:52:26 +0000 | [diff] [blame] | 95 | |
| 96 | typedef llvm::DenseMap<MethodBaseOffsetPairTy, |
Anders Carlsson | 136bd19 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 97 | OverriderInfo> OverridersMapTy; |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 98 | |
| 99 | /// OverridersMap - The final overriders for all virtual member functions of |
| 100 | /// all the base subobjects of the most derived class. |
| 101 | OverridersMapTy OverridersMap; |
| 102 | |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 103 | /// SubobjectsToOffsetsMapTy - A mapping from a base subobject (represented |
| 104 | /// as a record decl and a subobject number) and its offsets in the most |
| 105 | /// derived class as well as the layout class. |
| 106 | typedef llvm::DenseMap<std::pair<const CXXRecordDecl *, unsigned>, |
Ken Dyck | 70b47e0 | 2011-03-26 01:09:13 +0000 | [diff] [blame] | 107 | CharUnits> SubobjectOffsetMapTy; |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 108 | |
| 109 | typedef llvm::DenseMap<const CXXRecordDecl *, unsigned> SubobjectCountMapTy; |
| 110 | |
| 111 | /// ComputeBaseOffsets - Compute the offsets for all base subobjects of the |
| 112 | /// given base. |
| 113 | void ComputeBaseOffsets(BaseSubobject Base, bool IsVirtual, |
Ken Dyck | 58863dc | 2011-03-26 01:36:26 +0000 | [diff] [blame] | 114 | CharUnits OffsetInLayoutClass, |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 115 | SubobjectOffsetMapTy &SubobjectOffsets, |
| 116 | SubobjectOffsetMapTy &SubobjectLayoutClassOffsets, |
| 117 | SubobjectCountMapTy &SubobjectCounts); |
| 118 | |
Anders Carlsson | fd78840 | 2010-06-04 00:59:37 +0000 | [diff] [blame] | 119 | typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy; |
| 120 | |
| 121 | /// dump - dump the final overriders for a base subobject, and all its direct |
| 122 | /// and indirect base subobjects. |
| 123 | void dump(llvm::raw_ostream &Out, BaseSubobject Base, |
| 124 | VisitedVirtualBasesSetTy& VisitedVirtualBases); |
| 125 | |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 126 | public: |
Anders Carlsson | ca82a4f | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 127 | FinalOverriders(const CXXRecordDecl *MostDerivedClass, |
| 128 | uint64_t MostDerivedClassOffset, |
| 129 | const CXXRecordDecl *LayoutClass); |
Anders Carlsson | 8025e7b | 2010-02-24 22:18:01 +0000 | [diff] [blame] | 130 | |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 131 | /// getOverrider - Get the final overrider for the given method declaration in |
Anders Carlsson | 79547c3 | 2010-06-01 23:17:37 +0000 | [diff] [blame] | 132 | /// the subobject with the given base offset. |
| 133 | OverriderInfo getOverrider(const CXXMethodDecl *MD, |
Ken Dyck | 808457c | 2011-03-26 01:18:17 +0000 | [diff] [blame] | 134 | CharUnits BaseOffset) const { |
Anders Carlsson | 04e51cc | 2010-06-01 23:52:26 +0000 | [diff] [blame] | 135 | assert(OverridersMap.count(std::make_pair(MD, BaseOffset)) && |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 136 | "Did not find overrider!"); |
| 137 | |
Anders Carlsson | 04e51cc | 2010-06-01 23:52:26 +0000 | [diff] [blame] | 138 | return OverridersMap.lookup(std::make_pair(MD, BaseOffset)); |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /// dump - dump the final overriders. |
Anders Carlsson | 6a7e6a4 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 142 | void dump() { |
Anders Carlsson | fd78840 | 2010-06-04 00:59:37 +0000 | [diff] [blame] | 143 | VisitedVirtualBasesSetTy VisitedVirtualBases; |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 144 | dump(llvm::errs(), BaseSubobject(MostDerivedClass, CharUnits::Zero()), |
| 145 | VisitedVirtualBases); |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 146 | } |
| 147 | |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 148 | }; |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 149 | |
Anders Carlsson | 603d7d1 | 2010-02-27 20:02:53 +0000 | [diff] [blame] | 150 | #define DUMP_OVERRIDERS 0 |
| 151 | |
Anders Carlsson | ca82a4f | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 152 | FinalOverriders::FinalOverriders(const CXXRecordDecl *MostDerivedClass, |
| 153 | uint64_t MostDerivedClassOffset, |
| 154 | const CXXRecordDecl *LayoutClass) |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 155 | : MostDerivedClass(MostDerivedClass), |
Anders Carlsson | ca82a4f | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 156 | MostDerivedClassOffset(MostDerivedClassOffset), LayoutClass(LayoutClass), |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 157 | Context(MostDerivedClass->getASTContext()), |
| 158 | MostDerivedClassLayout(Context.getASTRecordLayout(MostDerivedClass)) { |
Anders Carlsson | fd78840 | 2010-06-04 00:59:37 +0000 | [diff] [blame] | 159 | |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 160 | // Compute base offsets. |
| 161 | SubobjectOffsetMapTy SubobjectOffsets; |
| 162 | SubobjectOffsetMapTy SubobjectLayoutClassOffsets; |
| 163 | SubobjectCountMapTy SubobjectCounts; |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 164 | ComputeBaseOffsets(BaseSubobject(MostDerivedClass, CharUnits::Zero()), |
| 165 | /*IsVirtual=*/false, |
Ken Dyck | 58863dc | 2011-03-26 01:36:26 +0000 | [diff] [blame] | 166 | Context.toCharUnitsFromBits(MostDerivedClassOffset), |
| 167 | SubobjectOffsets, SubobjectLayoutClassOffsets, |
| 168 | SubobjectCounts); |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 169 | |
| 170 | // Get the the final overriders. |
| 171 | CXXFinalOverriderMap FinalOverriders; |
| 172 | MostDerivedClass->getFinalOverriders(FinalOverriders); |
| 173 | |
| 174 | for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), |
| 175 | E = FinalOverriders.end(); I != E; ++I) { |
| 176 | const CXXMethodDecl *MD = I->first; |
| 177 | const OverridingMethods& Methods = I->second; |
| 178 | |
| 179 | for (OverridingMethods::const_iterator I = Methods.begin(), |
| 180 | E = Methods.end(); I != E; ++I) { |
| 181 | unsigned SubobjectNumber = I->first; |
| 182 | assert(SubobjectOffsets.count(std::make_pair(MD->getParent(), |
| 183 | SubobjectNumber)) && |
| 184 | "Did not find subobject offset!"); |
| 185 | |
Ken Dyck | 70b47e0 | 2011-03-26 01:09:13 +0000 | [diff] [blame] | 186 | CharUnits BaseOffset = SubobjectOffsets[std::make_pair(MD->getParent(), |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 187 | SubobjectNumber)]; |
| 188 | |
| 189 | assert(I->second.size() == 1 && "Final overrider is not unique!"); |
| 190 | const UniqueVirtualMethod &Method = I->second.front(); |
| 191 | |
| 192 | const CXXRecordDecl *OverriderRD = Method.Method->getParent(); |
| 193 | assert(SubobjectLayoutClassOffsets.count( |
| 194 | std::make_pair(OverriderRD, Method.Subobject)) |
| 195 | && "Did not find subobject offset!"); |
Ken Dyck | 70b47e0 | 2011-03-26 01:09:13 +0000 | [diff] [blame] | 196 | CharUnits OverriderOffset = |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 197 | SubobjectLayoutClassOffsets[std::make_pair(OverriderRD, |
| 198 | Method.Subobject)]; |
| 199 | |
Ken Dyck | 808457c | 2011-03-26 01:18:17 +0000 | [diff] [blame] | 200 | OverriderInfo& Overrider = OverridersMap[std::make_pair(MD, BaseOffset)]; |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 201 | assert(!Overrider.Method && "Overrider should not exist yet!"); |
| 202 | |
Ken Dyck | 785cbdb | 2011-03-26 01:29:16 +0000 | [diff] [blame] | 203 | Overrider.Offset = OverriderOffset; |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 204 | Overrider.Method = Method.Method; |
| 205 | } |
| 206 | } |
Anders Carlsson | 603d7d1 | 2010-02-27 20:02:53 +0000 | [diff] [blame] | 207 | |
| 208 | #if DUMP_OVERRIDERS |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 209 | // And dump them (for now). |
| 210 | dump(); |
Anders Carlsson | 603d7d1 | 2010-02-27 20:02:53 +0000 | [diff] [blame] | 211 | #endif |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 212 | } |
| 213 | |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 214 | static BaseOffset ComputeBaseOffset(ASTContext &Context, |
| 215 | const CXXRecordDecl *DerivedRD, |
| 216 | const CXXBasePath &Path) { |
Anders Carlsson | cce9ee8 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 217 | int64_t NonVirtualOffset = 0; |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 218 | |
Anders Carlsson | f3f6784 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 219 | unsigned NonVirtualStart = 0; |
| 220 | const CXXRecordDecl *VirtualBase = 0; |
| 221 | |
| 222 | // First, look for the virtual base class. |
| 223 | for (unsigned I = 0, E = Path.size(); I != E; ++I) { |
| 224 | const CXXBasePathElement &Element = Path[I]; |
| 225 | |
| 226 | if (Element.Base->isVirtual()) { |
| 227 | // FIXME: Can we break when we find the first virtual base? |
| 228 | // (If we can't, can't we just iterate over the path in reverse order?) |
| 229 | NonVirtualStart = I + 1; |
| 230 | QualType VBaseType = Element.Base->getType(); |
| 231 | VirtualBase = |
| 232 | cast<CXXRecordDecl>(VBaseType->getAs<RecordType>()->getDecl()); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | // Now compute the non-virtual offset. |
| 237 | for (unsigned I = NonVirtualStart, E = Path.size(); I != E; ++I) { |
| 238 | const CXXBasePathElement &Element = Path[I]; |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 239 | |
| 240 | // Check the base class offset. |
| 241 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(Element.Class); |
Anders Carlsson | ed7d0e8 | 2010-02-25 22:18:35 +0000 | [diff] [blame] | 242 | |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 243 | const RecordType *BaseType = Element.Base->getType()->getAs<RecordType>(); |
| 244 | const CXXRecordDecl *Base = cast<CXXRecordDecl>(BaseType->getDecl()); |
Anders Carlsson | ed7d0e8 | 2010-02-25 22:18:35 +0000 | [diff] [blame] | 245 | |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 246 | NonVirtualOffset += Layout.getBaseClassOffsetInBits(Base); |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | // FIXME: This should probably use CharUnits or something. Maybe we should |
| 250 | // even change the base offsets in ASTRecordLayout to be specified in |
| 251 | // CharUnits. |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 252 | return BaseOffset(DerivedRD, VirtualBase, NonVirtualOffset / 8); |
Anders Carlsson | 258a1e3 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 253 | |
| 254 | } |
| 255 | |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 256 | static BaseOffset ComputeBaseOffset(ASTContext &Context, |
| 257 | const CXXRecordDecl *BaseRD, |
| 258 | const CXXRecordDecl *DerivedRD) { |
Anders Carlsson | 258a1e3 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 259 | CXXBasePaths Paths(/*FindAmbiguities=*/false, |
| 260 | /*RecordPaths=*/true, /*DetectVirtual=*/false); |
| 261 | |
| 262 | if (!const_cast<CXXRecordDecl *>(DerivedRD)-> |
| 263 | isDerivedFrom(const_cast<CXXRecordDecl *>(BaseRD), Paths)) { |
| 264 | assert(false && "Class must be derived from the passed in base class!"); |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 265 | return BaseOffset(); |
Anders Carlsson | 258a1e3 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | return ComputeBaseOffset(Context, DerivedRD, Paths.front()); |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 269 | } |
| 270 | |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 271 | static BaseOffset |
Anders Carlsson | cce9ee8 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 272 | ComputeReturnAdjustmentBaseOffset(ASTContext &Context, |
| 273 | const CXXMethodDecl *DerivedMD, |
| 274 | const CXXMethodDecl *BaseMD) { |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 275 | const FunctionType *BaseFT = BaseMD->getType()->getAs<FunctionType>(); |
| 276 | const FunctionType *DerivedFT = DerivedMD->getType()->getAs<FunctionType>(); |
| 277 | |
| 278 | // Canonicalize the return types. |
| 279 | CanQualType CanDerivedReturnType = |
| 280 | Context.getCanonicalType(DerivedFT->getResultType()); |
| 281 | CanQualType CanBaseReturnType = |
| 282 | Context.getCanonicalType(BaseFT->getResultType()); |
| 283 | |
| 284 | assert(CanDerivedReturnType->getTypeClass() == |
| 285 | CanBaseReturnType->getTypeClass() && |
| 286 | "Types must have same type class!"); |
| 287 | |
| 288 | if (CanDerivedReturnType == CanBaseReturnType) { |
| 289 | // No adjustment needed. |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 290 | return BaseOffset(); |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | if (isa<ReferenceType>(CanDerivedReturnType)) { |
| 294 | CanDerivedReturnType = |
| 295 | CanDerivedReturnType->getAs<ReferenceType>()->getPointeeType(); |
| 296 | CanBaseReturnType = |
| 297 | CanBaseReturnType->getAs<ReferenceType>()->getPointeeType(); |
| 298 | } else if (isa<PointerType>(CanDerivedReturnType)) { |
| 299 | CanDerivedReturnType = |
| 300 | CanDerivedReturnType->getAs<PointerType>()->getPointeeType(); |
| 301 | CanBaseReturnType = |
| 302 | CanBaseReturnType->getAs<PointerType>()->getPointeeType(); |
| 303 | } else { |
| 304 | assert(false && "Unexpected return type!"); |
| 305 | } |
| 306 | |
| 307 | // We need to compare unqualified types here; consider |
| 308 | // const T *Base::foo(); |
| 309 | // T *Derived::foo(); |
| 310 | if (CanDerivedReturnType.getUnqualifiedType() == |
| 311 | CanBaseReturnType.getUnqualifiedType()) { |
| 312 | // No adjustment needed. |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 313 | return BaseOffset(); |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | const CXXRecordDecl *DerivedRD = |
| 317 | cast<CXXRecordDecl>(cast<RecordType>(CanDerivedReturnType)->getDecl()); |
| 318 | |
| 319 | const CXXRecordDecl *BaseRD = |
| 320 | cast<CXXRecordDecl>(cast<RecordType>(CanBaseReturnType)->getDecl()); |
| 321 | |
Anders Carlsson | cce9ee8 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 322 | return ComputeBaseOffset(Context, BaseRD, DerivedRD); |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 323 | } |
| 324 | |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 325 | void |
| 326 | FinalOverriders::ComputeBaseOffsets(BaseSubobject Base, bool IsVirtual, |
Ken Dyck | 58863dc | 2011-03-26 01:36:26 +0000 | [diff] [blame] | 327 | CharUnits OffsetInLayoutClass, |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 328 | SubobjectOffsetMapTy &SubobjectOffsets, |
| 329 | SubobjectOffsetMapTy &SubobjectLayoutClassOffsets, |
| 330 | SubobjectCountMapTy &SubobjectCounts) { |
| 331 | const CXXRecordDecl *RD = Base.getBase(); |
| 332 | |
| 333 | unsigned SubobjectNumber = 0; |
| 334 | if (!IsVirtual) |
| 335 | SubobjectNumber = ++SubobjectCounts[RD]; |
| 336 | |
| 337 | // Set up the subobject to offset mapping. |
| 338 | assert(!SubobjectOffsets.count(std::make_pair(RD, SubobjectNumber)) |
| 339 | && "Subobject offset already exists!"); |
| 340 | assert(!SubobjectLayoutClassOffsets.count(std::make_pair(RD, SubobjectNumber)) |
| 341 | && "Subobject offset already exists!"); |
| 342 | |
Ken Dyck | 70b47e0 | 2011-03-26 01:09:13 +0000 | [diff] [blame] | 343 | SubobjectOffsets[std::make_pair(RD, SubobjectNumber)] = Base.getBaseOffset(); |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 344 | SubobjectLayoutClassOffsets[std::make_pair(RD, SubobjectNumber)] = |
Ken Dyck | 58863dc | 2011-03-26 01:36:26 +0000 | [diff] [blame] | 345 | OffsetInLayoutClass; |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 346 | |
| 347 | // Traverse our bases. |
| 348 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 349 | E = RD->bases_end(); I != E; ++I) { |
| 350 | const CXXRecordDecl *BaseDecl = |
| 351 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 352 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 353 | CharUnits BaseOffset; |
| 354 | CharUnits BaseOffsetInLayoutClass; |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 355 | if (I->isVirtual()) { |
| 356 | // Check if we've visited this virtual base before. |
| 357 | if (SubobjectOffsets.count(std::make_pair(BaseDecl, 0))) |
| 358 | continue; |
| 359 | |
| 360 | const ASTRecordLayout &LayoutClassLayout = |
| 361 | Context.getASTRecordLayout(LayoutClass); |
| 362 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 363 | BaseOffset = MostDerivedClassLayout.getVBaseClassOffset(BaseDecl); |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 364 | BaseOffsetInLayoutClass = |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 365 | LayoutClassLayout.getVBaseClassOffset(BaseDecl); |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 366 | } else { |
| 367 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 368 | CharUnits Offset = Layout.getBaseClassOffset(BaseDecl); |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 369 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 370 | BaseOffset = Base.getBaseOffset() + Offset; |
Ken Dyck | 58863dc | 2011-03-26 01:36:26 +0000 | [diff] [blame] | 371 | BaseOffsetInLayoutClass = OffsetInLayoutClass + Offset; |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 372 | } |
| 373 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 374 | ComputeBaseOffsets(BaseSubobject(BaseDecl, BaseOffset), |
Ken Dyck | 58863dc | 2011-03-26 01:36:26 +0000 | [diff] [blame] | 375 | I->isVirtual(), BaseOffsetInLayoutClass, |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 376 | SubobjectOffsets, SubobjectLayoutClassOffsets, |
| 377 | SubobjectCounts); |
Anders Carlsson | 27860db | 2010-06-04 00:54:04 +0000 | [diff] [blame] | 378 | } |
| 379 | } |
| 380 | |
Anders Carlsson | fd78840 | 2010-06-04 00:59:37 +0000 | [diff] [blame] | 381 | void FinalOverriders::dump(llvm::raw_ostream &Out, BaseSubobject Base, |
| 382 | VisitedVirtualBasesSetTy &VisitedVirtualBases) { |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 383 | const CXXRecordDecl *RD = Base.getBase(); |
| 384 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 385 | |
| 386 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 387 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 388 | const CXXRecordDecl *BaseDecl = |
| 389 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 390 | |
Anders Carlsson | 033d486 | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 391 | // Ignore bases that don't have any virtual member functions. |
| 392 | if (!BaseDecl->isPolymorphic()) |
| 393 | continue; |
| 394 | |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 395 | CharUnits BaseOffset; |
Anders Carlsson | 6a7e6a4 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 396 | if (I->isVirtual()) { |
| 397 | if (!VisitedVirtualBases.insert(BaseDecl)) { |
| 398 | // We've visited this base before. |
| 399 | continue; |
| 400 | } |
| 401 | |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 402 | BaseOffset = MostDerivedClassLayout.getVBaseClassOffset(BaseDecl); |
Anders Carlsson | 6a7e6a4 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 403 | } else { |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 404 | BaseOffset = Layout.getBaseClassOffset(BaseDecl) + Base.getBaseOffset(); |
Anders Carlsson | 6a7e6a4 | 2010-02-14 00:37:35 +0000 | [diff] [blame] | 405 | } |
| 406 | |
Anders Carlsson | fd78840 | 2010-06-04 00:59:37 +0000 | [diff] [blame] | 407 | dump(Out, BaseSubobject(BaseDecl, BaseOffset), VisitedVirtualBases); |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 408 | } |
| 409 | |
| 410 | Out << "Final overriders for (" << RD->getQualifiedNameAsString() << ", "; |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 411 | Out << Base.getBaseOffset().getQuantity() << ")\n"; |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 412 | |
| 413 | // Now dump the overriders for this base subobject. |
| 414 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 415 | E = RD->method_end(); I != E; ++I) { |
| 416 | const CXXMethodDecl *MD = *I; |
| 417 | |
| 418 | if (!MD->isVirtual()) |
| 419 | continue; |
| 420 | |
Ken Dyck | 808457c | 2011-03-26 01:18:17 +0000 | [diff] [blame] | 421 | OverriderInfo Overrider = getOverrider(MD, Base.getBaseOffset()); |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 422 | |
Anders Carlsson | 6f1f002 | 2010-03-02 03:44:06 +0000 | [diff] [blame] | 423 | Out << " " << MD->getQualifiedNameAsString() << " - ("; |
Anders Carlsson | 8e661e1 | 2010-02-12 17:13:23 +0000 | [diff] [blame] | 424 | Out << Overrider.Method->getQualifiedNameAsString(); |
Ken Dyck | 785cbdb | 2011-03-26 01:29:16 +0000 | [diff] [blame] | 425 | Out << ", " << ", " << Overrider.Offset.getQuantity() << ')'; |
Anders Carlsson | 6f1f002 | 2010-03-02 03:44:06 +0000 | [diff] [blame] | 426 | |
Anders Carlsson | 042ce2d8 | 2010-06-01 23:47:05 +0000 | [diff] [blame] | 427 | BaseOffset Offset; |
| 428 | if (!Overrider.Method->isPure()) |
| 429 | Offset = ComputeReturnAdjustmentBaseOffset(Context, Overrider.Method, MD); |
Anders Carlsson | f3f6784 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 430 | |
Anders Carlsson | 042ce2d8 | 2010-06-01 23:47:05 +0000 | [diff] [blame] | 431 | if (!Offset.isEmpty()) { |
Anders Carlsson | f3f6784 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 432 | Out << " [ret-adj: "; |
| 433 | if (Offset.VirtualBase) |
| 434 | Out << Offset.VirtualBase->getQualifiedNameAsString() << " vbase, "; |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 435 | |
Anders Carlsson | f3f6784 | 2010-02-13 20:41:15 +0000 | [diff] [blame] | 436 | Out << Offset.NonVirtualOffset << " nv]"; |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 437 | } |
Anders Carlsson | cce9ee8 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 438 | |
Anders Carlsson | 8e661e1 | 2010-02-12 17:13:23 +0000 | [diff] [blame] | 439 | Out << "\n"; |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 440 | } |
| 441 | } |
| 442 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 443 | /// VTableComponent - Represents a single component in a vtable. |
| 444 | class VTableComponent { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 445 | public: |
| 446 | enum Kind { |
| 447 | CK_VCallOffset, |
| 448 | CK_VBaseOffset, |
| 449 | CK_OffsetToTop, |
| 450 | CK_RTTI, |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 451 | CK_FunctionPointer, |
| 452 | |
| 453 | /// CK_CompleteDtorPointer - A pointer to the complete destructor. |
| 454 | CK_CompleteDtorPointer, |
| 455 | |
| 456 | /// CK_DeletingDtorPointer - A pointer to the deleting destructor. |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 457 | CK_DeletingDtorPointer, |
| 458 | |
| 459 | /// CK_UnusedFunctionPointer - In some cases, a vtable function pointer |
| 460 | /// will end up never being called. Such vtable function pointers are |
| 461 | /// represented as a CK_UnusedFunctionPointer. |
| 462 | CK_UnusedFunctionPointer |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 463 | }; |
| 464 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 465 | static VTableComponent MakeVCallOffset(int64_t Offset) { |
| 466 | return VTableComponent(CK_VCallOffset, Offset); |
Anders Carlsson | b0a588f | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 467 | } |
| 468 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 469 | static VTableComponent MakeVBaseOffset(int64_t Offset) { |
| 470 | return VTableComponent(CK_VBaseOffset, Offset); |
Anders Carlsson | dc2dba3 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 471 | } |
| 472 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 473 | static VTableComponent MakeOffsetToTop(int64_t Offset) { |
| 474 | return VTableComponent(CK_OffsetToTop, Offset); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 475 | } |
| 476 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 477 | static VTableComponent MakeRTTI(const CXXRecordDecl *RD) { |
| 478 | return VTableComponent(CK_RTTI, reinterpret_cast<uintptr_t>(RD)); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 479 | } |
| 480 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 481 | static VTableComponent MakeFunction(const CXXMethodDecl *MD) { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 482 | assert(!isa<CXXDestructorDecl>(MD) && |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 483 | "Don't use MakeFunction with destructors!"); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 484 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 485 | return VTableComponent(CK_FunctionPointer, |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 486 | reinterpret_cast<uintptr_t>(MD)); |
| 487 | } |
| 488 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 489 | static VTableComponent MakeCompleteDtor(const CXXDestructorDecl *DD) { |
| 490 | return VTableComponent(CK_CompleteDtorPointer, |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 491 | reinterpret_cast<uintptr_t>(DD)); |
| 492 | } |
| 493 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 494 | static VTableComponent MakeDeletingDtor(const CXXDestructorDecl *DD) { |
| 495 | return VTableComponent(CK_DeletingDtorPointer, |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 496 | reinterpret_cast<uintptr_t>(DD)); |
| 497 | } |
| 498 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 499 | static VTableComponent MakeUnusedFunction(const CXXMethodDecl *MD) { |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 500 | assert(!isa<CXXDestructorDecl>(MD) && |
| 501 | "Don't use MakeUnusedFunction with destructors!"); |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 502 | return VTableComponent(CK_UnusedFunctionPointer, |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 503 | reinterpret_cast<uintptr_t>(MD)); |
| 504 | } |
| 505 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 506 | static VTableComponent getFromOpaqueInteger(uint64_t I) { |
| 507 | return VTableComponent(I); |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 508 | } |
| 509 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 510 | /// getKind - Get the kind of this vtable component. |
| 511 | Kind getKind() const { |
| 512 | return (Kind)(Value & 0x7); |
| 513 | } |
| 514 | |
Anders Carlsson | b0a588f | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 515 | int64_t getVCallOffset() const { |
| 516 | assert(getKind() == CK_VCallOffset && "Invalid component kind!"); |
| 517 | |
| 518 | return getOffset(); |
| 519 | } |
| 520 | |
Anders Carlsson | dc2dba3 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 521 | int64_t getVBaseOffset() const { |
| 522 | assert(getKind() == CK_VBaseOffset && "Invalid component kind!"); |
| 523 | |
| 524 | return getOffset(); |
| 525 | } |
| 526 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 527 | int64_t getOffsetToTop() const { |
| 528 | assert(getKind() == CK_OffsetToTop && "Invalid component kind!"); |
| 529 | |
| 530 | return getOffset(); |
| 531 | } |
| 532 | |
| 533 | const CXXRecordDecl *getRTTIDecl() const { |
| 534 | assert(getKind() == CK_RTTI && "Invalid component kind!"); |
| 535 | |
| 536 | return reinterpret_cast<CXXRecordDecl *>(getPointer()); |
| 537 | } |
| 538 | |
| 539 | const CXXMethodDecl *getFunctionDecl() const { |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 540 | assert(getKind() == CK_FunctionPointer); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 541 | |
| 542 | return reinterpret_cast<CXXMethodDecl *>(getPointer()); |
| 543 | } |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 544 | |
| 545 | const CXXDestructorDecl *getDestructorDecl() const { |
| 546 | assert((getKind() == CK_CompleteDtorPointer || |
| 547 | getKind() == CK_DeletingDtorPointer) && "Invalid component kind!"); |
| 548 | |
| 549 | return reinterpret_cast<CXXDestructorDecl *>(getPointer()); |
| 550 | } |
| 551 | |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 552 | const CXXMethodDecl *getUnusedFunctionDecl() const { |
| 553 | assert(getKind() == CK_UnusedFunctionPointer); |
| 554 | |
| 555 | return reinterpret_cast<CXXMethodDecl *>(getPointer()); |
| 556 | } |
| 557 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 558 | private: |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 559 | VTableComponent(Kind ComponentKind, int64_t Offset) { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 560 | assert((ComponentKind == CK_VCallOffset || |
| 561 | ComponentKind == CK_VBaseOffset || |
| 562 | ComponentKind == CK_OffsetToTop) && "Invalid component kind!"); |
| 563 | assert(Offset <= ((1LL << 56) - 1) && "Offset is too big!"); |
| 564 | |
| 565 | Value = ((Offset << 3) | ComponentKind); |
| 566 | } |
| 567 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 568 | VTableComponent(Kind ComponentKind, uintptr_t Ptr) { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 569 | assert((ComponentKind == CK_RTTI || |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 570 | ComponentKind == CK_FunctionPointer || |
| 571 | ComponentKind == CK_CompleteDtorPointer || |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 572 | ComponentKind == CK_DeletingDtorPointer || |
| 573 | ComponentKind == CK_UnusedFunctionPointer) && |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 574 | "Invalid component kind!"); |
| 575 | |
| 576 | assert((Ptr & 7) == 0 && "Pointer not sufficiently aligned!"); |
| 577 | |
| 578 | Value = Ptr | ComponentKind; |
| 579 | } |
| 580 | |
| 581 | int64_t getOffset() const { |
| 582 | assert((getKind() == CK_VCallOffset || getKind() == CK_VBaseOffset || |
| 583 | getKind() == CK_OffsetToTop) && "Invalid component kind!"); |
| 584 | |
| 585 | return Value >> 3; |
| 586 | } |
| 587 | |
| 588 | uintptr_t getPointer() const { |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 589 | assert((getKind() == CK_RTTI || |
| 590 | getKind() == CK_FunctionPointer || |
| 591 | getKind() == CK_CompleteDtorPointer || |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 592 | getKind() == CK_DeletingDtorPointer || |
| 593 | getKind() == CK_UnusedFunctionPointer) && |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 594 | "Invalid component kind!"); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 595 | |
| 596 | return static_cast<uintptr_t>(Value & ~7ULL); |
| 597 | } |
| 598 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 599 | explicit VTableComponent(uint64_t Value) |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 600 | : Value(Value) { } |
| 601 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 602 | /// The kind is stored in the lower 3 bits of the value. For offsets, we |
| 603 | /// make use of the facts that classes can't be larger than 2^55 bytes, |
| 604 | /// so we store the offset in the lower part of the 61 bytes that remain. |
| 605 | /// (The reason that we're not simply using a PointerIntPair here is that we |
| 606 | /// need the offsets to be 64-bit, even when on a 32-bit machine). |
| 607 | int64_t Value; |
| 608 | }; |
| 609 | |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 610 | /// VCallOffsetMap - Keeps track of vcall offsets when building a vtable. |
| 611 | struct VCallOffsetMap { |
| 612 | |
| 613 | typedef std::pair<const CXXMethodDecl *, int64_t> MethodAndOffsetPairTy; |
| 614 | |
| 615 | /// Offsets - Keeps track of methods and their offsets. |
| 616 | // FIXME: This should be a real map and not a vector. |
| 617 | llvm::SmallVector<MethodAndOffsetPairTy, 16> Offsets; |
| 618 | |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 619 | /// MethodsCanShareVCallOffset - Returns whether two virtual member functions |
| 620 | /// can share the same vcall offset. |
| 621 | static bool MethodsCanShareVCallOffset(const CXXMethodDecl *LHS, |
| 622 | const CXXMethodDecl *RHS); |
| 623 | |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 624 | public: |
| 625 | /// AddVCallOffset - Adds a vcall offset to the map. Returns true if the |
| 626 | /// add was successful, or false if there was already a member function with |
| 627 | /// the same signature in the map. |
| 628 | bool AddVCallOffset(const CXXMethodDecl *MD, int64_t OffsetOffset); |
| 629 | |
| 630 | /// getVCallOffsetOffset - Returns the vcall offset offset (relative to the |
| 631 | /// vtable address point) for the given virtual member function. |
| 632 | int64_t getVCallOffsetOffset(const CXXMethodDecl *MD); |
| 633 | |
Anders Carlsson | 9e3b3a3 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 634 | // empty - Return whether the offset map is empty or not. |
| 635 | bool empty() const { return Offsets.empty(); } |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 636 | }; |
| 637 | |
John McCall | 43c6ffb | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 638 | static bool HasSameVirtualSignature(const CXXMethodDecl *LHS, |
| 639 | const CXXMethodDecl *RHS) { |
| 640 | ASTContext &C = LHS->getASTContext(); // TODO: thread this down |
| 641 | CanQual<FunctionProtoType> |
| 642 | LT = C.getCanonicalType(LHS->getType()).getAs<FunctionProtoType>(), |
| 643 | RT = C.getCanonicalType(RHS->getType()).getAs<FunctionProtoType>(); |
| 644 | |
| 645 | // Fast-path matches in the canonical types. |
| 646 | if (LT == RT) return true; |
| 647 | |
| 648 | // Force the signatures to match. We can't rely on the overrides |
| 649 | // list here because there isn't necessarily an inheritance |
| 650 | // relationship between the two methods. |
| 651 | if (LT.getQualifiers() != RT.getQualifiers() || |
| 652 | LT->getNumArgs() != RT->getNumArgs()) |
| 653 | return false; |
| 654 | for (unsigned I = 0, E = LT->getNumArgs(); I != E; ++I) |
| 655 | if (LT->getArgType(I) != RT->getArgType(I)) |
| 656 | return false; |
| 657 | return true; |
| 658 | } |
| 659 | |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 660 | bool VCallOffsetMap::MethodsCanShareVCallOffset(const CXXMethodDecl *LHS, |
| 661 | const CXXMethodDecl *RHS) { |
| 662 | assert(LHS->isVirtual() && "LHS must be virtual!"); |
| 663 | assert(RHS->isVirtual() && "LHS must be virtual!"); |
| 664 | |
Anders Carlsson | d69b2f9 | 2010-02-27 04:12:52 +0000 | [diff] [blame] | 665 | // A destructor can share a vcall offset with another destructor. |
| 666 | if (isa<CXXDestructorDecl>(LHS)) |
| 667 | return isa<CXXDestructorDecl>(RHS); |
| 668 | |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 669 | // FIXME: We need to check more things here. |
| 670 | |
Anders Carlsson | d69b2f9 | 2010-02-27 04:12:52 +0000 | [diff] [blame] | 671 | // The methods must have the same name. |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 672 | DeclarationName LHSName = LHS->getDeclName(); |
| 673 | DeclarationName RHSName = RHS->getDeclName(); |
John McCall | 43c6ffb | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 674 | if (LHSName != RHSName) |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 675 | return false; |
John McCall | 43c6ffb | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 676 | |
Anders Carlsson | d69b2f9 | 2010-02-27 04:12:52 +0000 | [diff] [blame] | 677 | // And the same signatures. |
| 678 | return HasSameVirtualSignature(LHS, RHS); |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 679 | } |
| 680 | |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 681 | bool VCallOffsetMap::AddVCallOffset(const CXXMethodDecl *MD, |
| 682 | int64_t OffsetOffset) { |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 683 | // Check if we can reuse an offset. |
| 684 | for (unsigned I = 0, E = Offsets.size(); I != E; ++I) { |
| 685 | if (MethodsCanShareVCallOffset(Offsets[I].first, MD)) |
| 686 | return false; |
| 687 | } |
| 688 | |
| 689 | // Add the offset. |
| 690 | Offsets.push_back(MethodAndOffsetPairTy(MD, OffsetOffset)); |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 691 | return true; |
| 692 | } |
| 693 | |
| 694 | int64_t VCallOffsetMap::getVCallOffsetOffset(const CXXMethodDecl *MD) { |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 695 | // Look for an offset. |
| 696 | for (unsigned I = 0, E = Offsets.size(); I != E; ++I) { |
| 697 | if (MethodsCanShareVCallOffset(Offsets[I].first, MD)) |
| 698 | return Offsets[I].second; |
| 699 | } |
| 700 | |
| 701 | assert(false && "Should always find a vcall offset offset!"); |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 702 | return 0; |
| 703 | } |
| 704 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 705 | /// VCallAndVBaseOffsetBuilder - Class for building vcall and vbase offsets. |
| 706 | class VCallAndVBaseOffsetBuilder { |
Anders Carlsson | dd819c9 | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 707 | public: |
| 708 | typedef llvm::DenseMap<const CXXRecordDecl *, int64_t> |
| 709 | VBaseOffsetOffsetsMapTy; |
| 710 | |
| 711 | private: |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 712 | /// MostDerivedClass - The most derived class for which we're building vcall |
| 713 | /// and vbase offsets. |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 714 | const CXXRecordDecl *MostDerivedClass; |
| 715 | |
Anders Carlsson | c3f92a1 | 2010-02-27 21:09:00 +0000 | [diff] [blame] | 716 | /// LayoutClass - The class we're using for layout information. Will be |
| 717 | /// different than the most derived class if we're building a construction |
| 718 | /// vtable. |
| 719 | const CXXRecordDecl *LayoutClass; |
| 720 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 721 | /// Context - The ASTContext which we will use for layout information. |
| 722 | ASTContext &Context; |
| 723 | |
| 724 | /// Components - vcall and vbase offset components |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 725 | typedef llvm::SmallVector<VTableComponent, 64> VTableComponentVectorTy; |
| 726 | VTableComponentVectorTy Components; |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 727 | |
| 728 | /// VisitedVirtualBases - Visited virtual bases. |
| 729 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBases; |
| 730 | |
| 731 | /// VCallOffsets - Keeps track of vcall offsets. |
| 732 | VCallOffsetMap VCallOffsets; |
| 733 | |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 734 | |
| 735 | /// VBaseOffsetOffsets - Contains the offsets of the virtual base offsets, |
| 736 | /// relative to the address point. |
| 737 | VBaseOffsetOffsetsMapTy VBaseOffsetOffsets; |
| 738 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 739 | /// FinalOverriders - The final overriders of the most derived class. |
| 740 | /// (Can be null when we're not building a vtable of the most derived class). |
| 741 | const FinalOverriders *Overriders; |
| 742 | |
| 743 | /// AddVCallAndVBaseOffsets - Add vcall offsets and vbase offsets for the |
| 744 | /// given base subobject. |
| 745 | void AddVCallAndVBaseOffsets(BaseSubobject Base, bool BaseIsVirtual, |
| 746 | uint64_t RealBaseOffset); |
| 747 | |
| 748 | /// AddVCallOffsets - Add vcall offsets for the given base subobject. |
| 749 | void AddVCallOffsets(BaseSubobject Base, uint64_t VBaseOffset); |
| 750 | |
| 751 | /// AddVBaseOffsets - Add vbase offsets for the given class. |
Anders Carlsson | 93b1b49 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 752 | void AddVBaseOffsets(const CXXRecordDecl *Base, uint64_t OffsetInLayoutClass); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 753 | |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 754 | /// getCurrentOffsetOffset - Get the current vcall or vbase offset offset in |
| 755 | /// bytes, relative to the vtable address point. |
| 756 | int64_t getCurrentOffsetOffset() const; |
| 757 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 758 | public: |
| 759 | VCallAndVBaseOffsetBuilder(const CXXRecordDecl *MostDerivedClass, |
Anders Carlsson | c3f92a1 | 2010-02-27 21:09:00 +0000 | [diff] [blame] | 760 | const CXXRecordDecl *LayoutClass, |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 761 | const FinalOverriders *Overriders, |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 762 | BaseSubobject Base, bool BaseIsVirtual, |
| 763 | uint64_t OffsetInLayoutClass) |
| 764 | : MostDerivedClass(MostDerivedClass), LayoutClass(LayoutClass), |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 765 | Context(MostDerivedClass->getASTContext()), Overriders(Overriders) { |
| 766 | |
| 767 | // Add vcall and vbase offsets. |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 768 | AddVCallAndVBaseOffsets(Base, BaseIsVirtual, OffsetInLayoutClass); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | /// Methods for iterating over the components. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 772 | typedef VTableComponentVectorTy::const_reverse_iterator const_iterator; |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 773 | const_iterator components_begin() const { return Components.rbegin(); } |
| 774 | const_iterator components_end() const { return Components.rend(); } |
| 775 | |
Anders Carlsson | dd819c9 | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 776 | const VCallOffsetMap &getVCallOffsets() const { return VCallOffsets; } |
| 777 | const VBaseOffsetOffsetsMapTy &getVBaseOffsetOffsets() const { |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 778 | return VBaseOffsetOffsets; |
| 779 | } |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 780 | }; |
| 781 | |
| 782 | void |
| 783 | VCallAndVBaseOffsetBuilder::AddVCallAndVBaseOffsets(BaseSubobject Base, |
| 784 | bool BaseIsVirtual, |
| 785 | uint64_t RealBaseOffset) { |
| 786 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(Base.getBase()); |
| 787 | |
| 788 | // Itanium C++ ABI 2.5.2: |
| 789 | // ..in classes sharing a virtual table with a primary base class, the vcall |
| 790 | // and vbase offsets added by the derived class all come before the vcall |
| 791 | // and vbase offsets required by the base class, so that the latter may be |
| 792 | // laid out as required by the base class without regard to additions from |
| 793 | // the derived class(es). |
| 794 | |
| 795 | // (Since we're emitting the vcall and vbase offsets in reverse order, we'll |
| 796 | // emit them for the primary base first). |
| 797 | if (const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase()) { |
Anders Carlsson | 7f95cd1 | 2010-11-24 23:12:57 +0000 | [diff] [blame] | 798 | bool PrimaryBaseIsVirtual = Layout.isPrimaryBaseVirtual(); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 799 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 800 | CharUnits PrimaryBaseOffset; |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 801 | |
| 802 | // Get the base offset of the primary base. |
| 803 | if (PrimaryBaseIsVirtual) { |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 804 | assert(Layout.getVBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 805 | "Primary vbase should have a zero offset!"); |
| 806 | |
| 807 | const ASTRecordLayout &MostDerivedClassLayout = |
| 808 | Context.getASTRecordLayout(MostDerivedClass); |
| 809 | |
| 810 | PrimaryBaseOffset = |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 811 | MostDerivedClassLayout.getVBaseClassOffset(PrimaryBase); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 812 | } else { |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 813 | assert(Layout.getBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 814 | "Primary base should have a zero offset!"); |
| 815 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 816 | PrimaryBaseOffset = Base.getBaseOffset(); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 817 | } |
| 818 | |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 819 | AddVCallAndVBaseOffsets( |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 820 | BaseSubobject(PrimaryBase,PrimaryBaseOffset), |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 821 | PrimaryBaseIsVirtual, RealBaseOffset); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 822 | } |
| 823 | |
Anders Carlsson | 93b1b49 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 824 | AddVBaseOffsets(Base.getBase(), RealBaseOffset); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 825 | |
| 826 | // We only want to add vcall offsets for virtual bases. |
| 827 | if (BaseIsVirtual) |
| 828 | AddVCallOffsets(Base, RealBaseOffset); |
| 829 | } |
| 830 | |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 831 | int64_t VCallAndVBaseOffsetBuilder::getCurrentOffsetOffset() const { |
| 832 | // OffsetIndex is the index of this vcall or vbase offset, relative to the |
| 833 | // vtable address point. (We subtract 3 to account for the information just |
| 834 | // above the address point, the RTTI info, the offset to top, and the |
| 835 | // vcall offset itself). |
| 836 | int64_t OffsetIndex = -(int64_t)(3 + Components.size()); |
| 837 | |
| 838 | // FIXME: We shouldn't use / 8 here. |
| 839 | int64_t OffsetOffset = OffsetIndex * |
| 840 | (int64_t)Context.Target.getPointerWidth(0) / 8; |
| 841 | |
| 842 | return OffsetOffset; |
| 843 | } |
| 844 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 845 | void VCallAndVBaseOffsetBuilder::AddVCallOffsets(BaseSubobject Base, |
| 846 | uint64_t VBaseOffset) { |
| 847 | const CXXRecordDecl *RD = Base.getBase(); |
| 848 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 849 | |
John McCall | 43c6ffb | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 850 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 851 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 852 | // Handle the primary base first. |
Anders Carlsson | 343a26b | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 853 | // We only want to add vcall offsets if the base is non-virtual; a virtual |
| 854 | // primary base will have its vcall and vbase offsets emitted already. |
Anders Carlsson | 7f95cd1 | 2010-11-24 23:12:57 +0000 | [diff] [blame] | 855 | if (PrimaryBase && !Layout.isPrimaryBaseVirtual()) { |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 856 | // Get the base offset of the primary base. |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 857 | assert(Layout.getBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 343a26b | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 858 | "Primary base should have a zero offset!"); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 859 | |
Anders Carlsson | 343a26b | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 860 | AddVCallOffsets(BaseSubobject(PrimaryBase, Base.getBaseOffset()), |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 861 | VBaseOffset); |
| 862 | } |
Anders Carlsson | 343a26b | 2010-04-11 20:04:11 +0000 | [diff] [blame] | 863 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 864 | // Add the vcall offsets. |
| 865 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 866 | E = RD->method_end(); I != E; ++I) { |
| 867 | const CXXMethodDecl *MD = *I; |
| 868 | |
| 869 | if (!MD->isVirtual()) |
| 870 | continue; |
| 871 | |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 872 | int64_t OffsetOffset = getCurrentOffsetOffset(); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 873 | |
| 874 | // Don't add a vcall offset if we already have one for this member function |
| 875 | // signature. |
| 876 | if (!VCallOffsets.AddVCallOffset(MD, OffsetOffset)) |
| 877 | continue; |
| 878 | |
| 879 | int64_t Offset = 0; |
| 880 | |
| 881 | if (Overriders) { |
| 882 | // Get the final overrider. |
| 883 | FinalOverriders::OverriderInfo Overrider = |
Ken Dyck | 808457c | 2011-03-26 01:18:17 +0000 | [diff] [blame] | 884 | Overriders->getOverrider(MD, Base.getBaseOffset()); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 885 | |
Anders Carlsson | 31f595f | 2010-02-28 00:10:58 +0000 | [diff] [blame] | 886 | /// The vcall offset is the offset from the virtual base to the object |
| 887 | /// where the function was overridden. |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 888 | // FIXME: We should not use / 8 here. |
Ken Dyck | 785cbdb | 2011-03-26 01:29:16 +0000 | [diff] [blame] | 889 | Offset = (int64_t)(Context.toBits(Overrider.Offset) - VBaseOffset) / 8; |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 890 | } |
| 891 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 892 | Components.push_back(VTableComponent::MakeVCallOffset(Offset)); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | // And iterate over all non-virtual bases (ignoring the primary base). |
| 896 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 897 | E = RD->bases_end(); I != E; ++I) { |
| 898 | |
| 899 | if (I->isVirtual()) |
| 900 | continue; |
| 901 | |
| 902 | const CXXRecordDecl *BaseDecl = |
| 903 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
John McCall | 43c6ffb | 2010-02-26 20:22:44 +0000 | [diff] [blame] | 904 | if (BaseDecl == PrimaryBase) |
| 905 | continue; |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 906 | |
| 907 | // Get the base offset of this base. |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 908 | CharUnits BaseOffset = Base.getBaseOffset() + |
| 909 | Layout.getBaseClassOffset(BaseDecl); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 910 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 911 | AddVCallOffsets(BaseSubobject(BaseDecl, BaseOffset), |
| 912 | VBaseOffset); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 913 | } |
| 914 | } |
| 915 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 916 | void VCallAndVBaseOffsetBuilder::AddVBaseOffsets(const CXXRecordDecl *RD, |
Anders Carlsson | 93b1b49 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 917 | uint64_t OffsetInLayoutClass) { |
Anders Carlsson | c3f92a1 | 2010-02-27 21:09:00 +0000 | [diff] [blame] | 918 | const ASTRecordLayout &LayoutClassLayout = |
| 919 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 920 | |
| 921 | // Add vbase offsets. |
| 922 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 923 | E = RD->bases_end(); I != E; ++I) { |
| 924 | const CXXRecordDecl *BaseDecl = |
| 925 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 926 | |
| 927 | // Check if this is a virtual base that we haven't visited before. |
| 928 | if (I->isVirtual() && VisitedVirtualBases.insert(BaseDecl)) { |
| 929 | // FIXME: We shouldn't use / 8 here. |
Anders Carlsson | 93b1b49 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 930 | int64_t Offset = |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 931 | (int64_t)(LayoutClassLayout.getVBaseClassOffsetInBits(BaseDecl) - |
Anders Carlsson | 93b1b49 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 932 | OffsetInLayoutClass) / 8; |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 933 | |
| 934 | // Add the vbase offset offset. |
| 935 | assert(!VBaseOffsetOffsets.count(BaseDecl) && |
| 936 | "vbase offset offset already exists!"); |
| 937 | |
| 938 | int64_t VBaseOffsetOffset = getCurrentOffsetOffset(); |
| 939 | VBaseOffsetOffsets.insert(std::make_pair(BaseDecl, VBaseOffsetOffset)); |
| 940 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 941 | Components.push_back(VTableComponent::MakeVBaseOffset(Offset)); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 942 | } |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 943 | |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 944 | // Check the base class looking for more vbase offsets. |
Anders Carlsson | 93b1b49 | 2010-03-02 05:40:45 +0000 | [diff] [blame] | 945 | AddVBaseOffsets(BaseDecl, OffsetInLayoutClass); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 946 | } |
| 947 | } |
| 948 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 949 | /// VTableBuilder - Class for building vtable layout information. |
| 950 | class VTableBuilder { |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 951 | public: |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 952 | /// PrimaryBasesSetVectorTy - A set vector of direct and indirect |
| 953 | /// primary bases. |
| 954 | typedef llvm::SmallSetVector<const CXXRecordDecl *, 8> |
| 955 | PrimaryBasesSetVectorTy; |
| 956 | |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 957 | typedef llvm::DenseMap<const CXXRecordDecl *, int64_t> |
| 958 | VBaseOffsetOffsetsMapTy; |
Anders Carlsson | d03325c | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 959 | |
| 960 | typedef llvm::DenseMap<BaseSubobject, uint64_t> |
| 961 | AddressPointsMapTy; |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 962 | |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 963 | private: |
Anders Carlsson | a864caf | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 964 | /// VTables - Global vtable information. |
| 965 | CodeGenVTables &VTables; |
Anders Carlsson | cf5a882 | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 966 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 967 | /// MostDerivedClass - The most derived class for which we're building this |
| 968 | /// vtable. |
| 969 | const CXXRecordDecl *MostDerivedClass; |
| 970 | |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 971 | /// MostDerivedClassOffset - If we're building a construction vtable, this |
| 972 | /// holds the offset from the layout class to the most derived class. |
| 973 | const uint64_t MostDerivedClassOffset; |
| 974 | |
Anders Carlsson | 62c6c72 | 2010-02-28 00:36:23 +0000 | [diff] [blame] | 975 | /// MostDerivedClassIsVirtual - Whether the most derived class is a virtual |
| 976 | /// base. (This only makes sense when building a construction vtable). |
| 977 | bool MostDerivedClassIsVirtual; |
| 978 | |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 979 | /// LayoutClass - The class we're using for layout information. Will be |
| 980 | /// different than the most derived class if we're building a construction |
| 981 | /// vtable. |
| 982 | const CXXRecordDecl *LayoutClass; |
| 983 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 984 | /// Context - The ASTContext which we will use for layout information. |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 985 | ASTContext &Context; |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 986 | |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 987 | /// FinalOverriders - The final overriders of the most derived class. |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 988 | const FinalOverriders Overriders; |
Anders Carlsson | e8ac42a | 2010-02-11 21:24:32 +0000 | [diff] [blame] | 989 | |
Anders Carlsson | 9e3b3a3 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 990 | /// VCallOffsetsForVBases - Keeps track of vcall offsets for the virtual |
| 991 | /// bases in this vtable. |
| 992 | llvm::DenseMap<const CXXRecordDecl *, VCallOffsetMap> VCallOffsetsForVBases; |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 993 | |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 994 | /// VBaseOffsetOffsets - Contains the offsets of the virtual base offsets for |
| 995 | /// the most derived class. |
| 996 | VBaseOffsetOffsetsMapTy VBaseOffsetOffsets; |
| 997 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 998 | /// Components - The components of the vtable being built. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 999 | llvm::SmallVector<VTableComponent, 64> Components; |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1000 | |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1001 | /// AddressPoints - Address points for the vtable being built. |
Anders Carlsson | 0534b02 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 1002 | AddressPointsMapTy AddressPoints; |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1003 | |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1004 | /// MethodInfo - Contains information about a method in a vtable. |
| 1005 | /// (Used for computing 'this' pointer adjustment thunks. |
| 1006 | struct MethodInfo { |
| 1007 | /// BaseOffset - The base offset of this method. |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1008 | const CharUnits BaseOffset; |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1009 | |
Anders Carlsson | 423406f3 | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1010 | /// BaseOffsetInLayoutClass - The base offset in the layout class of this |
| 1011 | /// method. |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1012 | const CharUnits BaseOffsetInLayoutClass; |
Anders Carlsson | 423406f3 | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1013 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1014 | /// VTableIndex - The index in the vtable that this method has. |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1015 | /// (For destructors, this is the index of the complete destructor). |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1016 | const uint64_t VTableIndex; |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1017 | |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1018 | MethodInfo(CharUnits BaseOffset, CharUnits BaseOffsetInLayoutClass, |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1019 | uint64_t VTableIndex) |
Anders Carlsson | 423406f3 | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1020 | : BaseOffset(BaseOffset), |
| 1021 | BaseOffsetInLayoutClass(BaseOffsetInLayoutClass), |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1022 | VTableIndex(VTableIndex) { } |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1023 | |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1024 | MethodInfo() |
| 1025 | : BaseOffset(CharUnits::Zero()), |
| 1026 | BaseOffsetInLayoutClass(CharUnits::Zero()), |
| 1027 | VTableIndex(0) { } |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1028 | }; |
| 1029 | |
| 1030 | typedef llvm::DenseMap<const CXXMethodDecl *, MethodInfo> MethodInfoMapTy; |
| 1031 | |
| 1032 | /// MethodInfoMap - The information for all methods in the vtable we're |
| 1033 | /// currently building. |
| 1034 | MethodInfoMapTy MethodInfoMap; |
| 1035 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1036 | typedef llvm::DenseMap<uint64_t, ThunkInfo> VTableThunksMapTy; |
Anders Carlsson | 8a24029 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 1037 | |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1038 | /// VTableThunks - The thunks by vtable index in the vtable currently being |
| 1039 | /// built. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1040 | VTableThunksMapTy VTableThunks; |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1041 | |
Anders Carlsson | 917229c | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 1042 | typedef llvm::SmallVector<ThunkInfo, 1> ThunkInfoVectorTy; |
| 1043 | typedef llvm::DenseMap<const CXXMethodDecl *, ThunkInfoVectorTy> ThunksMapTy; |
Anders Carlsson | 5644614 | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1044 | |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1045 | /// Thunks - A map that contains all the thunks needed for all methods in the |
| 1046 | /// most derived class for which the vtable is currently being built. |
Anders Carlsson | 917229c | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 1047 | ThunksMapTy Thunks; |
Anders Carlsson | 5644614 | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1048 | |
| 1049 | /// AddThunk - Add a thunk for the given method. |
Anders Carlsson | 4b2411e | 2010-03-21 20:27:14 +0000 | [diff] [blame] | 1050 | void AddThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk); |
Anders Carlsson | 5644614 | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1051 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1052 | /// ComputeThisAdjustments - Compute the 'this' pointer adjustments for the |
| 1053 | /// part of the vtable we're currently building. |
| 1054 | void ComputeThisAdjustments(); |
| 1055 | |
Anders Carlsson | dc2dba3 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 1056 | typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy; |
| 1057 | |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1058 | /// PrimaryVirtualBases - All known virtual bases who are a primary base of |
Anders Carlsson | 0570f71 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1059 | /// some other base. |
| 1060 | VisitedVirtualBasesSetTy PrimaryVirtualBases; |
| 1061 | |
Anders Carlsson | cf5a882 | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1062 | /// ComputeReturnAdjustment - Compute the return adjustment given a return |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1063 | /// adjustment base offset. |
Anders Carlsson | 075056a | 2010-02-23 01:34:28 +0000 | [diff] [blame] | 1064 | ReturnAdjustment ComputeReturnAdjustment(BaseOffset Offset); |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1065 | |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1066 | /// ComputeThisAdjustmentBaseOffset - Compute the base offset for adjusting |
| 1067 | /// the 'this' pointer from the base subobject to the derived subobject. |
| 1068 | BaseOffset ComputeThisAdjustmentBaseOffset(BaseSubobject Base, |
| 1069 | BaseSubobject Derived) const; |
| 1070 | |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 1071 | /// ComputeThisAdjustment - Compute the 'this' pointer adjustment for the |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1072 | /// given virtual member function, its offset in the layout class and its |
| 1073 | /// final overrider. |
| 1074 | ThisAdjustment |
| 1075 | ComputeThisAdjustment(const CXXMethodDecl *MD, |
| 1076 | uint64_t BaseOffsetInLayoutClass, |
| 1077 | FinalOverriders::OverriderInfo Overrider); |
| 1078 | |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1079 | /// AddMethod - Add a single virtual member function to the vtable |
| 1080 | /// components vector. |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1081 | void AddMethod(const CXXMethodDecl *MD, ReturnAdjustment ReturnAdjustment); |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1082 | |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1083 | /// IsOverriderUsed - Returns whether the overrider will ever be used in this |
| 1084 | /// part of the vtable. |
| 1085 | /// |
| 1086 | /// Itanium C++ ABI 2.5.2: |
| 1087 | /// |
| 1088 | /// struct A { virtual void f(); }; |
| 1089 | /// struct B : virtual public A { int i; }; |
| 1090 | /// struct C : virtual public A { int j; }; |
| 1091 | /// struct D : public B, public C {}; |
| 1092 | /// |
| 1093 | /// When B and C are declared, A is a primary base in each case, so although |
| 1094 | /// vcall offsets are allocated in the A-in-B and A-in-C vtables, no this |
| 1095 | /// adjustment is required and no thunk is generated. However, inside D |
| 1096 | /// objects, A is no longer a primary base of C, so if we allowed calls to |
| 1097 | /// C::f() to use the copy of A's vtable in the C subobject, we would need |
| 1098 | /// to adjust this from C* to B::A*, which would require a third-party |
| 1099 | /// thunk. Since we require that a call to C::f() first convert to A*, |
| 1100 | /// C-in-D's copy of A's vtable is never referenced, so this is not |
| 1101 | /// necessary. |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1102 | bool IsOverriderUsed(const CXXMethodDecl *Overrider, |
| 1103 | uint64_t BaseOffsetInLayoutClass, |
| 1104 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1105 | uint64_t FirstBaseOffsetInLayoutClass) const; |
| 1106 | |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1107 | |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1108 | /// AddMethods - Add the methods of this base subobject and all its |
| 1109 | /// primary bases to the vtable components vector. |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1110 | void AddMethods(BaseSubobject Base, uint64_t BaseOffsetInLayoutClass, |
| 1111 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1112 | uint64_t FirstBaseOffsetInLayoutClass, |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1113 | PrimaryBasesSetVectorTy &PrimaryBases); |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1114 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1115 | // LayoutVTable - Layout the vtable for the given base class, including its |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1116 | // secondary vtables and any vtables for virtual bases. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1117 | void LayoutVTable(); |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1118 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1119 | /// LayoutPrimaryAndSecondaryVTables - Layout the primary vtable for the |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1120 | /// given base subobject, as well as all its secondary vtables. |
Anders Carlsson | b41c633 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1121 | /// |
Anders Carlsson | 3383e2a | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1122 | /// \param BaseIsMorallyVirtual whether the base subobject is a virtual base |
| 1123 | /// or a direct or indirect base of a virtual base. |
| 1124 | /// |
Anders Carlsson | b41c633 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1125 | /// \param BaseIsVirtualInLayoutClass - Whether the base subobject is virtual |
| 1126 | /// in the layout class. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1127 | void LayoutPrimaryAndSecondaryVTables(BaseSubobject Base, |
Anders Carlsson | 3383e2a | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1128 | bool BaseIsMorallyVirtual, |
Anders Carlsson | b41c633 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1129 | bool BaseIsVirtualInLayoutClass, |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1130 | uint64_t OffsetInLayoutClass); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1131 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1132 | /// LayoutSecondaryVTables - Layout the secondary vtables for the given base |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1133 | /// subobject. |
Anders Carlsson | 115b475 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1134 | /// |
| 1135 | /// \param BaseIsMorallyVirtual whether the base subobject is a virtual base |
| 1136 | /// or a direct or indirect base of a virtual base. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1137 | void LayoutSecondaryVTables(BaseSubobject Base, bool BaseIsMorallyVirtual, |
Anders Carlsson | 115b475 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1138 | uint64_t OffsetInLayoutClass); |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1139 | |
| 1140 | /// DeterminePrimaryVirtualBases - Determine the primary virtual bases in this |
| 1141 | /// class hierarchy. |
| 1142 | void DeterminePrimaryVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1143 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1144 | VisitedVirtualBasesSetTy &VBases); |
| 1145 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1146 | /// LayoutVTablesForVirtualBases - Layout vtables for all virtual bases of the |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1147 | /// given base (excluding any primary bases). |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1148 | void LayoutVTablesForVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1149 | VisitedVirtualBasesSetTy &VBases); |
| 1150 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1151 | /// isBuildingConstructionVTable - Return whether this vtable builder is |
Anders Carlsson | 31f595f | 2010-02-28 00:10:58 +0000 | [diff] [blame] | 1152 | /// building a construction vtable. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1153 | bool isBuildingConstructorVTable() const { |
Anders Carlsson | 31f595f | 2010-02-28 00:10:58 +0000 | [diff] [blame] | 1154 | return MostDerivedClass != LayoutClass; |
| 1155 | } |
| 1156 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1157 | public: |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1158 | VTableBuilder(CodeGenVTables &VTables, const CXXRecordDecl *MostDerivedClass, |
Anders Carlsson | 62c6c72 | 2010-02-28 00:36:23 +0000 | [diff] [blame] | 1159 | uint64_t MostDerivedClassOffset, bool MostDerivedClassIsVirtual, |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1160 | const CXXRecordDecl *LayoutClass) |
Anders Carlsson | a864caf | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 1161 | : VTables(VTables), MostDerivedClass(MostDerivedClass), |
Anders Carlsson | 62c6c72 | 2010-02-28 00:36:23 +0000 | [diff] [blame] | 1162 | MostDerivedClassOffset(MostDerivedClassOffset), |
| 1163 | MostDerivedClassIsVirtual(MostDerivedClassIsVirtual), |
| 1164 | LayoutClass(LayoutClass), Context(MostDerivedClass->getASTContext()), |
Anders Carlsson | ca82a4f | 2010-03-10 02:33:41 +0000 | [diff] [blame] | 1165 | Overriders(MostDerivedClass, MostDerivedClassOffset, LayoutClass) { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1166 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1167 | LayoutVTable(); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1168 | } |
| 1169 | |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 1170 | ThunksMapTy::const_iterator thunks_begin() const { |
| 1171 | return Thunks.begin(); |
| 1172 | } |
| 1173 | |
| 1174 | ThunksMapTy::const_iterator thunks_end() const { |
| 1175 | return Thunks.end(); |
| 1176 | } |
| 1177 | |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1178 | const VBaseOffsetOffsetsMapTy &getVBaseOffsetOffsets() const { |
| 1179 | return VBaseOffsetOffsets; |
| 1180 | } |
| 1181 | |
| 1182 | /// getNumVTableComponents - Return the number of components in the vtable |
| 1183 | /// currently built. |
| 1184 | uint64_t getNumVTableComponents() const { |
| 1185 | return Components.size(); |
| 1186 | } |
| 1187 | |
Anders Carlsson | d03325c | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1188 | const uint64_t *vtable_components_data_begin() const { |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1189 | return reinterpret_cast<const uint64_t *>(Components.begin()); |
| 1190 | } |
| 1191 | |
Anders Carlsson | d03325c | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1192 | const uint64_t *vtable_components_data_end() const { |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 1193 | return reinterpret_cast<const uint64_t *>(Components.end()); |
| 1194 | } |
| 1195 | |
Anders Carlsson | d03325c | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 1196 | AddressPointsMapTy::const_iterator address_points_begin() const { |
| 1197 | return AddressPoints.begin(); |
| 1198 | } |
| 1199 | |
| 1200 | AddressPointsMapTy::const_iterator address_points_end() const { |
| 1201 | return AddressPoints.end(); |
| 1202 | } |
| 1203 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1204 | VTableThunksMapTy::const_iterator vtable_thunks_begin() const { |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 1205 | return VTableThunks.begin(); |
| 1206 | } |
| 1207 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1208 | VTableThunksMapTy::const_iterator vtable_thunks_end() const { |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 1209 | return VTableThunks.end(); |
| 1210 | } |
| 1211 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1212 | /// dumpLayout - Dump the vtable layout. |
| 1213 | void dumpLayout(llvm::raw_ostream&); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1214 | }; |
| 1215 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1216 | void VTableBuilder::AddThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk) { |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1217 | assert(!isBuildingConstructorVTable() && |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1218 | "Can't add thunks for construction vtable"); |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 1219 | |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1220 | llvm::SmallVector<ThunkInfo, 1> &ThunksVector = Thunks[MD]; |
Anders Carlsson | 5644614 | 2010-03-17 20:06:32 +0000 | [diff] [blame] | 1221 | |
| 1222 | // Check if we have this thunk already. |
| 1223 | if (std::find(ThunksVector.begin(), ThunksVector.end(), Thunk) != |
| 1224 | ThunksVector.end()) |
| 1225 | return; |
| 1226 | |
| 1227 | ThunksVector.push_back(Thunk); |
| 1228 | } |
| 1229 | |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1230 | typedef llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverriddenMethodsSetTy; |
| 1231 | |
| 1232 | /// ComputeAllOverriddenMethods - Given a method decl, will return a set of all |
| 1233 | /// the overridden methods that the function decl overrides. |
| 1234 | static void |
| 1235 | ComputeAllOverriddenMethods(const CXXMethodDecl *MD, |
| 1236 | OverriddenMethodsSetTy& OverriddenMethods) { |
| 1237 | assert(MD->isVirtual() && "Method is not virtual!"); |
| 1238 | |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1239 | for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), |
| 1240 | E = MD->end_overridden_methods(); I != E; ++I) { |
| 1241 | const CXXMethodDecl *OverriddenMD = *I; |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1242 | |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1243 | OverriddenMethods.insert(OverriddenMD); |
| 1244 | |
| 1245 | ComputeAllOverriddenMethods(OverriddenMD, OverriddenMethods); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1246 | } |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1247 | } |
| 1248 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1249 | void VTableBuilder::ComputeThisAdjustments() { |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1250 | // Now go through the method info map and see if any of the methods need |
| 1251 | // 'this' pointer adjustments. |
| 1252 | for (MethodInfoMapTy::const_iterator I = MethodInfoMap.begin(), |
| 1253 | E = MethodInfoMap.end(); I != E; ++I) { |
| 1254 | const CXXMethodDecl *MD = I->first; |
| 1255 | const MethodInfo &MethodInfo = I->second; |
| 1256 | |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1257 | // Ignore adjustments for unused function pointers. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1258 | uint64_t VTableIndex = MethodInfo.VTableIndex; |
| 1259 | if (Components[VTableIndex].getKind() == |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1260 | VTableComponent::CK_UnusedFunctionPointer) |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1261 | continue; |
| 1262 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1263 | // Get the final overrider for this method. |
| 1264 | FinalOverriders::OverriderInfo Overrider = |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1265 | Overriders.getOverrider(MD, MethodInfo.BaseOffset); |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1266 | |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1267 | // Check if we need an adjustment at all. |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1268 | if (MethodInfo.BaseOffsetInLayoutClass == Overrider.Offset) { |
Anders Carlsson | eba1a60 | 2010-03-29 15:08:41 +0000 | [diff] [blame] | 1269 | // When a return thunk is needed by a derived class that overrides a |
| 1270 | // virtual base, gcc uses a virtual 'this' adjustment as well. |
| 1271 | // While the thunk itself might be needed by vtables in subclasses or |
| 1272 | // in construction vtables, there doesn't seem to be a reason for using |
| 1273 | // the thunk in this vtable. Still, we do so to match gcc. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1274 | if (VTableThunks.lookup(VTableIndex).Return.isEmpty()) |
Anders Carlsson | eba1a60 | 2010-03-29 15:08:41 +0000 | [diff] [blame] | 1275 | continue; |
| 1276 | } |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1277 | |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1278 | ThisAdjustment ThisAdjustment = |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1279 | ComputeThisAdjustment(MD, |
| 1280 | Context.toBits(MethodInfo.BaseOffsetInLayoutClass), Overrider); |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1281 | |
| 1282 | if (ThisAdjustment.isEmpty()) |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1283 | continue; |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1284 | |
Anders Carlsson | 01d3c7d | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1285 | // Add it. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1286 | VTableThunks[VTableIndex].This = ThisAdjustment; |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1287 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1288 | if (isa<CXXDestructorDecl>(MD)) { |
| 1289 | // Add an adjustment for the deleting destructor as well. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1290 | VTableThunks[VTableIndex + 1].This = ThisAdjustment; |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1291 | } |
| 1292 | } |
| 1293 | |
| 1294 | /// Clear the method info map. |
| 1295 | MethodInfoMap.clear(); |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1296 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1297 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1298 | // We don't need to store thunk information for construction vtables. |
| 1299 | return; |
| 1300 | } |
| 1301 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1302 | for (VTableThunksMapTy::const_iterator I = VTableThunks.begin(), |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1303 | E = VTableThunks.end(); I != E; ++I) { |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1304 | const VTableComponent &Component = Components[I->first]; |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1305 | const ThunkInfo &Thunk = I->second; |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1306 | const CXXMethodDecl *MD; |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1307 | |
| 1308 | switch (Component.getKind()) { |
| 1309 | default: |
| 1310 | llvm_unreachable("Unexpected vtable component kind!"); |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1311 | case VTableComponent::CK_FunctionPointer: |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1312 | MD = Component.getFunctionDecl(); |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1313 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1314 | case VTableComponent::CK_CompleteDtorPointer: |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1315 | MD = Component.getDestructorDecl(); |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1316 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1317 | case VTableComponent::CK_DeletingDtorPointer: |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1318 | // We've already added the thunk when we saw the complete dtor pointer. |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1319 | continue; |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1320 | } |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1321 | |
| 1322 | if (MD->getParent() == MostDerivedClass) |
| 1323 | AddThunk(MD, Thunk); |
Anders Carlsson | 64decd3 | 2010-03-22 15:47:01 +0000 | [diff] [blame] | 1324 | } |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1325 | } |
| 1326 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1327 | ReturnAdjustment VTableBuilder::ComputeReturnAdjustment(BaseOffset Offset) { |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1328 | ReturnAdjustment Adjustment; |
| 1329 | |
| 1330 | if (!Offset.isEmpty()) { |
Anders Carlsson | cf5a882 | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1331 | if (Offset.VirtualBase) { |
| 1332 | // Get the virtual base offset offset. |
Anders Carlsson | e442488 | 2010-03-11 07:00:45 +0000 | [diff] [blame] | 1333 | if (Offset.DerivedClass == MostDerivedClass) { |
| 1334 | // We can get the offset offset directly from our map. |
| 1335 | Adjustment.VBaseOffsetOffset = |
| 1336 | VBaseOffsetOffsets.lookup(Offset.VirtualBase); |
| 1337 | } else { |
| 1338 | Adjustment.VBaseOffsetOffset = |
Anders Carlsson | a864caf | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 1339 | VTables.getVirtualBaseOffsetOffset(Offset.DerivedClass, |
| 1340 | Offset.VirtualBase); |
Anders Carlsson | e442488 | 2010-03-11 07:00:45 +0000 | [diff] [blame] | 1341 | } |
Anders Carlsson | cf5a882 | 2010-02-13 21:07:32 +0000 | [diff] [blame] | 1342 | } |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1343 | |
| 1344 | Adjustment.NonVirtual = Offset.NonVirtualOffset; |
| 1345 | } |
| 1346 | |
| 1347 | return Adjustment; |
| 1348 | } |
| 1349 | |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1350 | BaseOffset |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1351 | VTableBuilder::ComputeThisAdjustmentBaseOffset(BaseSubobject Base, |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1352 | BaseSubobject Derived) const { |
| 1353 | const CXXRecordDecl *BaseRD = Base.getBase(); |
| 1354 | const CXXRecordDecl *DerivedRD = Derived.getBase(); |
| 1355 | |
| 1356 | CXXBasePaths Paths(/*FindAmbiguities=*/true, |
| 1357 | /*RecordPaths=*/true, /*DetectVirtual=*/true); |
| 1358 | |
| 1359 | if (!const_cast<CXXRecordDecl *>(DerivedRD)-> |
| 1360 | isDerivedFrom(const_cast<CXXRecordDecl *>(BaseRD), Paths)) { |
| 1361 | assert(false && "Class must be derived from the passed in base class!"); |
| 1362 | return BaseOffset(); |
| 1363 | } |
| 1364 | |
| 1365 | // We have to go through all the paths, and see which one leads us to the |
| 1366 | // right base subobject. |
| 1367 | for (CXXBasePaths::const_paths_iterator I = Paths.begin(), E = Paths.end(); |
| 1368 | I != E; ++I) { |
| 1369 | BaseOffset Offset = ComputeBaseOffset(Context, DerivedRD, *I); |
| 1370 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1371 | CharUnits OffsetToBaseSubobject = |
| 1372 | CharUnits::fromQuantity(Offset.NonVirtualOffset); |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1373 | |
| 1374 | if (Offset.VirtualBase) { |
| 1375 | // If we have a virtual base class, the non-virtual offset is relative |
| 1376 | // to the virtual base class offset. |
Anders Carlsson | 423406f3 | 2010-03-10 21:25:37 +0000 | [diff] [blame] | 1377 | const ASTRecordLayout &LayoutClassLayout = |
| 1378 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1379 | |
| 1380 | /// Get the virtual base offset, relative to the most derived class |
| 1381 | /// layout. |
| 1382 | OffsetToBaseSubobject += |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1383 | LayoutClassLayout.getVBaseClassOffset(Offset.VirtualBase); |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1384 | } else { |
| 1385 | // Otherwise, the non-virtual offset is relative to the derived class |
| 1386 | // offset. |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1387 | OffsetToBaseSubobject += Derived.getBaseOffset(); |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1388 | } |
| 1389 | |
| 1390 | // Check if this path gives us the right base subobject. |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1391 | if (OffsetToBaseSubobject == Base.getBaseOffset()) { |
Anders Carlsson | 9f19aaaa | 2010-02-27 19:57:44 +0000 | [diff] [blame] | 1392 | // Since we're going from the base class _to_ the derived class, we'll |
| 1393 | // invert the non-virtual offset here. |
| 1394 | Offset.NonVirtualOffset = -Offset.NonVirtualOffset; |
| 1395 | return Offset; |
| 1396 | } |
| 1397 | } |
| 1398 | |
| 1399 | return BaseOffset(); |
| 1400 | } |
| 1401 | |
Anders Carlsson | 67fd3a50d | 2010-03-23 15:13:06 +0000 | [diff] [blame] | 1402 | ThisAdjustment |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1403 | VTableBuilder::ComputeThisAdjustment(const CXXMethodDecl *MD, |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1404 | uint64_t BaseOffsetInLayoutClass, |
| 1405 | FinalOverriders::OverriderInfo Overrider) { |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1406 | // Ignore adjustments for pure virtual member functions. |
| 1407 | if (Overrider.Method->isPure()) |
| 1408 | return ThisAdjustment(); |
| 1409 | |
| 1410 | BaseSubobject OverriddenBaseSubobject(MD->getParent(), |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1411 | Context.toCharUnitsFromBits( |
| 1412 | BaseOffsetInLayoutClass)); |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1413 | |
| 1414 | BaseSubobject OverriderBaseSubobject(Overrider.Method->getParent(), |
Ken Dyck | 785cbdb | 2011-03-26 01:29:16 +0000 | [diff] [blame] | 1415 | Overrider.Offset); |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1416 | |
| 1417 | // Compute the adjustment offset. |
| 1418 | BaseOffset Offset = ComputeThisAdjustmentBaseOffset(OverriddenBaseSubobject, |
| 1419 | OverriderBaseSubobject); |
| 1420 | if (Offset.isEmpty()) |
| 1421 | return ThisAdjustment(); |
| 1422 | |
Anders Carlsson | d3adb0c | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1423 | ThisAdjustment Adjustment; |
| 1424 | |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1425 | if (Offset.VirtualBase) { |
| 1426 | // Get the vcall offset map for this virtual base. |
| 1427 | VCallOffsetMap &VCallOffsets = VCallOffsetsForVBases[Offset.VirtualBase]; |
Anders Carlsson | 8847d9e | 2010-02-18 17:26:40 +0000 | [diff] [blame] | 1428 | |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1429 | if (VCallOffsets.empty()) { |
| 1430 | // We don't have vcall offsets for this virtual base, go ahead and |
| 1431 | // build them. |
| 1432 | VCallAndVBaseOffsetBuilder Builder(MostDerivedClass, MostDerivedClass, |
| 1433 | /*FinalOverriders=*/0, |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1434 | BaseSubobject(Offset.VirtualBase, |
| 1435 | CharUnits::Zero()), |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1436 | /*BaseIsVirtual=*/true, |
| 1437 | /*OffsetInLayoutClass=*/0); |
| 1438 | |
| 1439 | VCallOffsets = Builder.getVCallOffsets(); |
| 1440 | } |
| 1441 | |
| 1442 | Adjustment.VCallOffsetOffset = VCallOffsets.getVCallOffsetOffset(MD); |
Anders Carlsson | d3adb0c | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1443 | } |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1444 | |
| 1445 | // Set the non-virtual part of the adjustment. |
| 1446 | Adjustment.NonVirtual = Offset.NonVirtualOffset; |
Anders Carlsson | d3adb0c | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1447 | |
| 1448 | return Adjustment; |
| 1449 | } |
Anders Carlsson | 5d3b901 | 2010-03-12 05:28:07 +0000 | [diff] [blame] | 1450 | |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1451 | void |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1452 | VTableBuilder::AddMethod(const CXXMethodDecl *MD, |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1453 | ReturnAdjustment ReturnAdjustment) { |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1454 | if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) { |
| 1455 | assert(ReturnAdjustment.isEmpty() && |
| 1456 | "Destructor can't have return adjustment!"); |
Anders Carlsson | d3adb0c | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 1457 | |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1458 | // Add both the complete destructor and the deleting destructor. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1459 | Components.push_back(VTableComponent::MakeCompleteDtor(DD)); |
| 1460 | Components.push_back(VTableComponent::MakeDeletingDtor(DD)); |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1461 | } else { |
| 1462 | // Add the return adjustment if necessary. |
| 1463 | if (!ReturnAdjustment.isEmpty()) |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 1464 | VTableThunks[Components.size()].Return = ReturnAdjustment; |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1465 | |
| 1466 | // Add the function. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1467 | Components.push_back(VTableComponent::MakeFunction(MD)); |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1468 | } |
| 1469 | } |
| 1470 | |
Anders Carlsson | d202541 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1471 | /// OverridesIndirectMethodInBase - Return whether the given member function |
| 1472 | /// overrides any methods in the set of given bases. |
| 1473 | /// Unlike OverridesMethodInBase, this checks "overriders of overriders". |
| 1474 | /// For example, if we have: |
| 1475 | /// |
| 1476 | /// struct A { virtual void f(); } |
| 1477 | /// struct B : A { virtual void f(); } |
| 1478 | /// struct C : B { virtual void f(); } |
| 1479 | /// |
| 1480 | /// OverridesIndirectMethodInBase will return true if given C::f as the method |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1481 | /// and { A } as the set of bases. |
Anders Carlsson | d202541 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1482 | static bool |
| 1483 | OverridesIndirectMethodInBases(const CXXMethodDecl *MD, |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1484 | VTableBuilder::PrimaryBasesSetVectorTy &Bases) { |
Anders Carlsson | c6db5ab | 2010-04-17 17:24:33 +0000 | [diff] [blame] | 1485 | if (Bases.count(MD->getParent())) |
| 1486 | return true; |
| 1487 | |
Anders Carlsson | d202541 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1488 | for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), |
| 1489 | E = MD->end_overridden_methods(); I != E; ++I) { |
| 1490 | const CXXMethodDecl *OverriddenMD = *I; |
Anders Carlsson | d202541 | 2010-02-27 06:38:03 +0000 | [diff] [blame] | 1491 | |
| 1492 | // Check "indirect overriders". |
| 1493 | if (OverridesIndirectMethodInBases(OverriddenMD, Bases)) |
| 1494 | return true; |
| 1495 | } |
| 1496 | |
| 1497 | return false; |
| 1498 | } |
| 1499 | |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1500 | bool |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1501 | VTableBuilder::IsOverriderUsed(const CXXMethodDecl *Overrider, |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1502 | uint64_t BaseOffsetInLayoutClass, |
| 1503 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1504 | uint64_t FirstBaseOffsetInLayoutClass) const { |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1505 | // If the base and the first base in the primary base chain have the same |
| 1506 | // offsets, then this overrider will be used. |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1507 | if (BaseOffsetInLayoutClass == FirstBaseOffsetInLayoutClass) |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1508 | return true; |
| 1509 | |
| 1510 | // We know now that Base (or a direct or indirect base of it) is a primary |
| 1511 | // base in part of the class hierarchy, but not a primary base in the most |
| 1512 | // derived class. |
| 1513 | |
| 1514 | // If the overrider is the first base in the primary base chain, we know |
| 1515 | // that the overrider will be used. |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1516 | if (Overrider->getParent() == FirstBaseInPrimaryBaseChain) |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1517 | return true; |
| 1518 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1519 | VTableBuilder::PrimaryBasesSetVectorTy PrimaryBases; |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1520 | |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1521 | const CXXRecordDecl *RD = FirstBaseInPrimaryBaseChain; |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1522 | PrimaryBases.insert(RD); |
| 1523 | |
| 1524 | // Now traverse the base chain, starting with the first base, until we find |
| 1525 | // the base that is no longer a primary base. |
| 1526 | while (true) { |
| 1527 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1528 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 1529 | |
| 1530 | if (!PrimaryBase) |
| 1531 | break; |
| 1532 | |
Anders Carlsson | 7f95cd1 | 2010-11-24 23:12:57 +0000 | [diff] [blame] | 1533 | if (Layout.isPrimaryBaseVirtual()) { |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1534 | assert(Layout.getVBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1535 | "Primary base should always be at offset 0!"); |
| 1536 | |
Anders Carlsson | 7162ab9 | 2010-02-28 18:37:33 +0000 | [diff] [blame] | 1537 | const ASTRecordLayout &LayoutClassLayout = |
| 1538 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1539 | |
| 1540 | // Now check if this is the primary base that is not a primary base in the |
| 1541 | // most derived class. |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1542 | if (LayoutClassLayout.getVBaseClassOffsetInBits(PrimaryBase) != |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1543 | FirstBaseOffsetInLayoutClass) { |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1544 | // We found it, stop walking the chain. |
| 1545 | break; |
| 1546 | } |
| 1547 | } else { |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1548 | assert(Layout.getBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1549 | "Primary base should always be at offset 0!"); |
| 1550 | } |
Anders Carlsson | 01d3c7d | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1551 | |
Anders Carlsson | b26c2ab | 2010-02-27 19:51:04 +0000 | [diff] [blame] | 1552 | if (!PrimaryBases.insert(PrimaryBase)) |
| 1553 | assert(false && "Found a duplicate primary base!"); |
| 1554 | |
Anders Carlsson | 01d3c7d | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1555 | RD = PrimaryBase; |
Anders Carlsson | 8939e40 | 2010-02-23 06:34:44 +0000 | [diff] [blame] | 1556 | } |
| 1557 | |
| 1558 | // If the final overrider is an override of one of the primary bases, |
| 1559 | // then we know that it will be used. |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1560 | return OverridesIndirectMethodInBases(Overrider, PrimaryBases); |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1561 | } |
| 1562 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1563 | /// FindNearestOverriddenMethod - Given a method, returns the overridden method |
| 1564 | /// from the nearest base. Returns null if no method was found. |
| 1565 | static const CXXMethodDecl * |
| 1566 | FindNearestOverriddenMethod(const CXXMethodDecl *MD, |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1567 | VTableBuilder::PrimaryBasesSetVectorTy &Bases) { |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1568 | OverriddenMethodsSetTy OverriddenMethods; |
| 1569 | ComputeAllOverriddenMethods(MD, OverriddenMethods); |
| 1570 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1571 | for (int I = Bases.size(), E = 0; I != E; --I) { |
| 1572 | const CXXRecordDecl *PrimaryBase = Bases[I - 1]; |
| 1573 | |
| 1574 | // Now check the overriden methods. |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1575 | for (OverriddenMethodsSetTy::const_iterator I = OverriddenMethods.begin(), |
| 1576 | E = OverriddenMethods.end(); I != E; ++I) { |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1577 | const CXXMethodDecl *OverriddenMD = *I; |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 1578 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1579 | // We found our overridden method. |
| 1580 | if (OverriddenMD->getParent() == PrimaryBase) |
| 1581 | return OverriddenMD; |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | return 0; |
| 1586 | } |
| 1587 | |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1588 | void |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1589 | VTableBuilder::AddMethods(BaseSubobject Base, uint64_t BaseOffsetInLayoutClass, |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1590 | const CXXRecordDecl *FirstBaseInPrimaryBaseChain, |
| 1591 | uint64_t FirstBaseOffsetInLayoutClass, |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1592 | PrimaryBasesSetVectorTy &PrimaryBases) { |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1593 | const CXXRecordDecl *RD = Base.getBase(); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1594 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1595 | |
| 1596 | if (const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase()) { |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1597 | CharUnits PrimaryBaseOffset; |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1598 | uint64_t PrimaryBaseOffsetInLayoutClass; |
Anders Carlsson | 7f95cd1 | 2010-11-24 23:12:57 +0000 | [diff] [blame] | 1599 | if (Layout.isPrimaryBaseVirtual()) { |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1600 | assert(Layout.getVBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 0570f71 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1601 | "Primary vbase should have a zero offset!"); |
| 1602 | |
| 1603 | const ASTRecordLayout &MostDerivedClassLayout = |
| 1604 | Context.getASTRecordLayout(MostDerivedClass); |
| 1605 | |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1606 | PrimaryBaseOffset = |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1607 | MostDerivedClassLayout.getVBaseClassOffset(PrimaryBase); |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1608 | |
| 1609 | const ASTRecordLayout &LayoutClassLayout = |
| 1610 | Context.getASTRecordLayout(LayoutClass); |
| 1611 | |
| 1612 | PrimaryBaseOffsetInLayoutClass = |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1613 | LayoutClassLayout.getVBaseClassOffsetInBits(PrimaryBase); |
Anders Carlsson | 0570f71 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1614 | } else { |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1615 | assert(Layout.getBaseClassOffsetInBits(PrimaryBase) == 0 && |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1616 | "Primary base should have a zero offset!"); |
Anders Carlsson | 0570f71 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1617 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1618 | PrimaryBaseOffset = Base.getBaseOffset(); |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1619 | PrimaryBaseOffsetInLayoutClass = BaseOffsetInLayoutClass; |
Anders Carlsson | 0570f71 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1620 | } |
Anders Carlsson | 7162ab9 | 2010-02-28 18:37:33 +0000 | [diff] [blame] | 1621 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1622 | AddMethods(BaseSubobject(PrimaryBase, PrimaryBaseOffset), |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1623 | PrimaryBaseOffsetInLayoutClass, FirstBaseInPrimaryBaseChain, |
| 1624 | FirstBaseOffsetInLayoutClass, PrimaryBases); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1625 | |
| 1626 | if (!PrimaryBases.insert(PrimaryBase)) |
| 1627 | assert(false && "Found a duplicate primary base!"); |
| 1628 | } |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1629 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1630 | // Now go through all virtual member functions and add them. |
| 1631 | for (CXXRecordDecl::method_iterator I = RD->method_begin(), |
| 1632 | E = RD->method_end(); I != E; ++I) { |
| 1633 | const CXXMethodDecl *MD = *I; |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1634 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1635 | if (!MD->isVirtual()) |
| 1636 | continue; |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1637 | |
| 1638 | // Get the final overrider. |
Anders Carlsson | 136bd19 | 2010-02-12 16:55:34 +0000 | [diff] [blame] | 1639 | FinalOverriders::OverriderInfo Overrider = |
Ken Dyck | 808457c | 2011-03-26 01:18:17 +0000 | [diff] [blame] | 1640 | Overriders.getOverrider(MD, Base.getBaseOffset()); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1641 | |
| 1642 | // Check if this virtual member function overrides a method in a primary |
| 1643 | // base. If this is the case, and the return type doesn't require adjustment |
| 1644 | // then we can just use the member function from the primary base. |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1645 | if (const CXXMethodDecl *OverriddenMD = |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1646 | FindNearestOverriddenMethod(MD, PrimaryBases)) { |
Anders Carlsson | cce9ee8 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 1647 | if (ComputeReturnAdjustmentBaseOffset(Context, MD, |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1648 | OverriddenMD).isEmpty()) { |
| 1649 | // Replace the method info of the overridden method with our own |
| 1650 | // method. |
| 1651 | assert(MethodInfoMap.count(OverriddenMD) && |
| 1652 | "Did not find the overridden method!"); |
| 1653 | MethodInfo &OverriddenMethodInfo = MethodInfoMap[OverriddenMD]; |
| 1654 | |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1655 | MethodInfo MethodInfo(Base.getBaseOffset(), |
| 1656 | Context.toCharUnitsFromBits(BaseOffsetInLayoutClass), |
| 1657 | OverriddenMethodInfo.VTableIndex); |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1658 | |
| 1659 | assert(!MethodInfoMap.count(MD) && |
| 1660 | "Should not have method info for this method yet!"); |
| 1661 | |
| 1662 | MethodInfoMap.insert(std::make_pair(MD, MethodInfo)); |
| 1663 | MethodInfoMap.erase(OverriddenMD); |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1664 | |
| 1665 | // If the overridden method exists in a virtual base class or a direct |
| 1666 | // or indirect base class of a virtual base class, we need to emit a |
| 1667 | // thunk if we ever have a class hierarchy where the base class is not |
| 1668 | // a primary base in the complete object. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1669 | if (!isBuildingConstructorVTable() && OverriddenMD != MD) { |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1670 | // Compute the this adjustment. |
| 1671 | ThisAdjustment ThisAdjustment = |
| 1672 | ComputeThisAdjustment(OverriddenMD, BaseOffsetInLayoutClass, |
| 1673 | Overrider); |
| 1674 | |
Anders Carlsson | 800ded6 | 2010-03-29 02:53:58 +0000 | [diff] [blame] | 1675 | if (ThisAdjustment.VCallOffsetOffset && |
| 1676 | Overrider.Method->getParent() == MostDerivedClass) { |
John McCall | 4783825 | 2010-11-09 01:18:05 +0000 | [diff] [blame] | 1677 | |
| 1678 | // There's no return adjustment from OverriddenMD and MD, |
| 1679 | // but that doesn't mean there isn't one between MD and |
| 1680 | // the final overrider. |
| 1681 | BaseOffset ReturnAdjustmentOffset = |
| 1682 | ComputeReturnAdjustmentBaseOffset(Context, Overrider.Method, MD); |
| 1683 | ReturnAdjustment ReturnAdjustment = |
| 1684 | ComputeReturnAdjustment(ReturnAdjustmentOffset); |
| 1685 | |
Anders Carlsson | 800ded6 | 2010-03-29 02:53:58 +0000 | [diff] [blame] | 1686 | // This is a virtual thunk for the most derived class, add it. |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1687 | AddThunk(Overrider.Method, |
John McCall | 4783825 | 2010-11-09 01:18:05 +0000 | [diff] [blame] | 1688 | ThunkInfo(ThisAdjustment, ReturnAdjustment)); |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 1689 | } |
| 1690 | } |
| 1691 | |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1692 | continue; |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1693 | } |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1694 | } |
Anders Carlsson | eee53d9 | 2010-02-13 02:02:03 +0000 | [diff] [blame] | 1695 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1696 | // Insert the method info for this method. |
Ken Dyck | 7d876f3 | 2011-03-27 18:57:53 +0000 | [diff] [blame^] | 1697 | MethodInfo MethodInfo(Base.getBaseOffset(), |
| 1698 | Context.toCharUnitsFromBits(BaseOffsetInLayoutClass), |
| 1699 | Components.size()); |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1700 | |
| 1701 | assert(!MethodInfoMap.count(MD) && |
| 1702 | "Should not have method info for this method yet!"); |
| 1703 | MethodInfoMap.insert(std::make_pair(MD, MethodInfo)); |
Anders Carlsson | 01d3c7d | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1704 | |
| 1705 | // Check if this overrider is going to be used. |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1706 | const CXXMethodDecl *OverriderMD = Overrider.Method; |
| 1707 | if (!IsOverriderUsed(OverriderMD, BaseOffsetInLayoutClass, |
| 1708 | FirstBaseInPrimaryBaseChain, |
| 1709 | FirstBaseOffsetInLayoutClass)) { |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1710 | Components.push_back(VTableComponent::MakeUnusedFunction(OverriderMD)); |
Anders Carlsson | 01d3c7d | 2010-02-27 18:09:40 +0000 | [diff] [blame] | 1711 | continue; |
| 1712 | } |
Anders Carlsson | a8796c6 | 2010-02-23 04:26:39 +0000 | [diff] [blame] | 1713 | |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1714 | // Check if this overrider needs a return adjustment. |
Anders Carlsson | 042ce2d8 | 2010-06-01 23:47:05 +0000 | [diff] [blame] | 1715 | // We don't want to do this for pure virtual member functions. |
| 1716 | BaseOffset ReturnAdjustmentOffset; |
| 1717 | if (!OverriderMD->isPure()) { |
| 1718 | ReturnAdjustmentOffset = |
| 1719 | ComputeReturnAdjustmentBaseOffset(Context, OverriderMD, MD); |
| 1720 | } |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 1721 | |
| 1722 | ReturnAdjustment ReturnAdjustment = |
| 1723 | ComputeReturnAdjustment(ReturnAdjustmentOffset); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1724 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1725 | AddMethod(Overrider.Method, ReturnAdjustment); |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1726 | } |
| 1727 | } |
| 1728 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1729 | void VTableBuilder::LayoutVTable() { |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1730 | LayoutPrimaryAndSecondaryVTables(BaseSubobject(MostDerivedClass, |
| 1731 | CharUnits::Zero()), |
Anders Carlsson | 3383e2a | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1732 | /*BaseIsMorallyVirtual=*/false, |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1733 | MostDerivedClassIsVirtual, |
| 1734 | MostDerivedClassOffset); |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1735 | |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1736 | VisitedVirtualBasesSetTy VBases; |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1737 | |
| 1738 | // Determine the primary virtual bases. |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1739 | DeterminePrimaryVirtualBases(MostDerivedClass, MostDerivedClassOffset, |
| 1740 | VBases); |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1741 | VBases.clear(); |
| 1742 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1743 | LayoutVTablesForVirtualBases(MostDerivedClass, VBases); |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1744 | } |
| 1745 | |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1746 | void |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1747 | VTableBuilder::LayoutPrimaryAndSecondaryVTables(BaseSubobject Base, |
Anders Carlsson | 3383e2a | 2010-04-11 22:20:36 +0000 | [diff] [blame] | 1748 | bool BaseIsMorallyVirtual, |
Anders Carlsson | b41c633 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1749 | bool BaseIsVirtualInLayoutClass, |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1750 | uint64_t OffsetInLayoutClass) { |
Chris Lattner | d2408f7 | 2010-02-17 21:42:34 +0000 | [diff] [blame] | 1751 | assert(Base.getBase()->isDynamicClass() && "class does not have a vtable!"); |
Anders Carlsson | 033d486 | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 1752 | |
Anders Carlsson | 77904f1 | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 1753 | // Add vcall and vbase offsets for this vtable. |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1754 | VCallAndVBaseOffsetBuilder Builder(MostDerivedClass, LayoutClass, &Overriders, |
Anders Carlsson | b41c633 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1755 | Base, BaseIsVirtualInLayoutClass, |
| 1756 | OffsetInLayoutClass); |
Anders Carlsson | 422f778 | 2010-02-25 03:45:56 +0000 | [diff] [blame] | 1757 | Components.append(Builder.components_begin(), Builder.components_end()); |
| 1758 | |
Anders Carlsson | 9e3b3a3 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 1759 | // Check if we need to add these vcall offsets. |
Anders Carlsson | b41c633 | 2010-04-11 22:03:57 +0000 | [diff] [blame] | 1760 | if (BaseIsVirtualInLayoutClass && !Builder.getVCallOffsets().empty()) { |
Anders Carlsson | 9e3b3a3 | 2010-02-25 22:23:13 +0000 | [diff] [blame] | 1761 | VCallOffsetMap &VCallOffsets = VCallOffsetsForVBases[Base.getBase()]; |
| 1762 | |
| 1763 | if (VCallOffsets.empty()) |
| 1764 | VCallOffsets = Builder.getVCallOffsets(); |
| 1765 | } |
| 1766 | |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 1767 | // If we're laying out the most derived class we want to keep track of the |
| 1768 | // virtual base class offset offsets. |
| 1769 | if (Base.getBase() == MostDerivedClass) |
| 1770 | VBaseOffsetOffsets = Builder.getVBaseOffsetOffsets(); |
| 1771 | |
Anders Carlsson | 77904f1 | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 1772 | // Add the offset to top. |
Anders Carlsson | 258a1e3 | 2010-02-14 00:16:19 +0000 | [diff] [blame] | 1773 | // FIXME: We should not use / 8 here. |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1774 | int64_t OffsetToTop = -(int64_t)(OffsetInLayoutClass - |
| 1775 | MostDerivedClassOffset) / 8; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1776 | Components.push_back(VTableComponent::MakeOffsetToTop(OffsetToTop)); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1777 | |
| 1778 | // Next, add the RTTI. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1779 | Components.push_back(VTableComponent::MakeRTTI(MostDerivedClass)); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1780 | |
Anders Carlsson | e8a9756 | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 1781 | uint64_t AddressPoint = Components.size(); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1782 | |
| 1783 | // Now go through all virtual member functions and add them. |
Anders Carlsson | d46ed89 | 2010-02-27 16:18:19 +0000 | [diff] [blame] | 1784 | PrimaryBasesSetVectorTy PrimaryBases; |
Anders Carlsson | 804cf51 | 2010-03-10 06:51:42 +0000 | [diff] [blame] | 1785 | AddMethods(Base, OffsetInLayoutClass, Base.getBase(), OffsetInLayoutClass, |
| 1786 | PrimaryBases); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1787 | |
Anders Carlsson | 4068798 | 2010-02-27 16:52:49 +0000 | [diff] [blame] | 1788 | // Compute 'this' pointer adjustments. |
| 1789 | ComputeThisAdjustments(); |
| 1790 | |
Anders Carlsson | 151b062 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1791 | // Add all address points. |
| 1792 | const CXXRecordDecl *RD = Base.getBase(); |
| 1793 | while (true) { |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1794 | AddressPoints.insert(std::make_pair( |
| 1795 | BaseSubobject(RD, Context.toCharUnitsFromBits(OffsetInLayoutClass)), |
| 1796 | AddressPoint)); |
Anders Carlsson | 151b062 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1797 | |
| 1798 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1799 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
Anders Carlsson | e8a9756 | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 1800 | |
Anders Carlsson | 151b062 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1801 | if (!PrimaryBase) |
| 1802 | break; |
| 1803 | |
Anders Carlsson | 7f95cd1 | 2010-11-24 23:12:57 +0000 | [diff] [blame] | 1804 | if (Layout.isPrimaryBaseVirtual()) { |
Anders Carlsson | 151b062 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1805 | // Check if this virtual primary base is a primary base in the layout |
| 1806 | // class. If it's not, we don't want to add it. |
| 1807 | const ASTRecordLayout &LayoutClassLayout = |
| 1808 | Context.getASTRecordLayout(LayoutClass); |
| 1809 | |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1810 | if (LayoutClassLayout.getVBaseClassOffsetInBits(PrimaryBase) != |
Anders Carlsson | 151b062 | 2010-03-25 21:45:14 +0000 | [diff] [blame] | 1811 | OffsetInLayoutClass) { |
| 1812 | // We don't want to add this class (or any of its primary bases). |
| 1813 | break; |
| 1814 | } |
| 1815 | } |
| 1816 | |
| 1817 | RD = PrimaryBase; |
Anders Carlsson | e8a9756 | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 1818 | } |
| 1819 | |
Anders Carlsson | a9f633b | 2010-02-24 16:43:12 +0000 | [diff] [blame] | 1820 | // Layout secondary vtables. |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1821 | LayoutSecondaryVTables(Base, BaseIsMorallyVirtual, OffsetInLayoutClass); |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1822 | } |
| 1823 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1824 | void VTableBuilder::LayoutSecondaryVTables(BaseSubobject Base, |
Anders Carlsson | 115b475 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1825 | bool BaseIsMorallyVirtual, |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1826 | uint64_t OffsetInLayoutClass) { |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1827 | // Itanium C++ ABI 2.5.2: |
| 1828 | // Following the primary virtual table of a derived class are secondary |
| 1829 | // virtual tables for each of its proper base classes, except any primary |
| 1830 | // base(s) with which it shares its primary virtual table. |
| 1831 | |
| 1832 | const CXXRecordDecl *RD = Base.getBase(); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1833 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1834 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1835 | |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1836 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1837 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1838 | // Ignore virtual bases, we'll emit them later. |
| 1839 | if (I->isVirtual()) |
| 1840 | continue; |
| 1841 | |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1842 | const CXXRecordDecl *BaseDecl = |
| 1843 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
Anders Carlsson | 033d486 | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 1844 | |
Anders Carlsson | dc2dba3 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 1845 | // Ignore bases that don't have a vtable. |
| 1846 | if (!BaseDecl->isDynamicClass()) |
| 1847 | continue; |
Anders Carlsson | 033d486 | 2010-02-14 17:05:59 +0000 | [diff] [blame] | 1848 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1849 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | 703a086 | 2010-03-10 19:15:26 +0000 | [diff] [blame] | 1850 | // Itanium C++ ABI 2.6.4: |
| 1851 | // Some of the base class subobjects may not need construction virtual |
| 1852 | // tables, which will therefore not be present in the construction |
| 1853 | // virtual table group, even though the subobject virtual tables are |
| 1854 | // present in the main virtual table group for the complete object. |
Anders Carlsson | 115b475 | 2010-03-10 19:39:11 +0000 | [diff] [blame] | 1855 | if (!BaseIsMorallyVirtual && !BaseDecl->getNumVBases()) |
Anders Carlsson | 703a086 | 2010-03-10 19:15:26 +0000 | [diff] [blame] | 1856 | continue; |
Anders Carlsson | 703a086 | 2010-03-10 19:15:26 +0000 | [diff] [blame] | 1857 | } |
| 1858 | |
Anders Carlsson | e75aaa9 | 2010-02-13 22:05:23 +0000 | [diff] [blame] | 1859 | // Get the base offset of this base. |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1860 | CharUnits RelativeBaseOffset = Layout.getBaseClassOffset(BaseDecl); |
| 1861 | CharUnits BaseOffset = Base.getBaseOffset() + RelativeBaseOffset; |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1862 | |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1863 | CharUnits BaseOffsetInLayoutClass = |
| 1864 | Context.toCharUnitsFromBits(OffsetInLayoutClass) + RelativeBaseOffset; |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1865 | |
| 1866 | // Don't emit a secondary vtable for a primary base. We might however want |
| 1867 | // to emit secondary vtables for other bases of this base. |
| 1868 | if (BaseDecl == PrimaryBase) { |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1869 | LayoutSecondaryVTables( |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1870 | BaseSubobject(BaseDecl, BaseOffset), |
| 1871 | BaseIsMorallyVirtual, Context.toBits(BaseOffsetInLayoutClass)); |
Anders Carlsson | 1415793 | 2010-02-16 16:02:57 +0000 | [diff] [blame] | 1872 | continue; |
| 1873 | } |
Anders Carlsson | e75aaa9 | 2010-02-13 22:05:23 +0000 | [diff] [blame] | 1874 | |
Anders Carlsson | b716a54 | 2010-02-16 16:26:28 +0000 | [diff] [blame] | 1875 | // Layout the primary vtable (and any secondary vtables) for this base. |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1876 | LayoutPrimaryAndSecondaryVTables( |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1877 | BaseSubobject(BaseDecl, BaseOffset), |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1878 | BaseIsMorallyVirtual, |
| 1879 | /*BaseIsVirtualInLayoutClass=*/false, |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 1880 | Context.toBits(BaseOffsetInLayoutClass)); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 1881 | } |
| 1882 | } |
| 1883 | |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1884 | void |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1885 | VTableBuilder::DeterminePrimaryVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1886 | uint64_t OffsetInLayoutClass, |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1887 | VisitedVirtualBasesSetTy &VBases) { |
| 1888 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 1889 | |
| 1890 | // Check if this base has a primary base. |
| 1891 | if (const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase()) { |
Anders Carlsson | 8b37bb7 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1892 | |
| 1893 | // Check if it's virtual. |
Anders Carlsson | 7f95cd1 | 2010-11-24 23:12:57 +0000 | [diff] [blame] | 1894 | if (Layout.isPrimaryBaseVirtual()) { |
Anders Carlsson | 8b37bb7 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1895 | bool IsPrimaryVirtualBase = true; |
| 1896 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1897 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | 8b37bb7 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1898 | // Check if the base is actually a primary base in the class we use for |
| 1899 | // layout. |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1900 | const ASTRecordLayout &LayoutClassLayout = |
| 1901 | Context.getASTRecordLayout(LayoutClass); |
| 1902 | |
| 1903 | uint64_t PrimaryBaseOffsetInLayoutClass = |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1904 | LayoutClassLayout.getVBaseClassOffsetInBits(PrimaryBase); |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1905 | |
| 1906 | // We know that the base is not a primary base in the layout class if |
| 1907 | // the base offsets are different. |
| 1908 | if (PrimaryBaseOffsetInLayoutClass != OffsetInLayoutClass) |
Anders Carlsson | 8b37bb7 | 2010-02-28 18:08:38 +0000 | [diff] [blame] | 1909 | IsPrimaryVirtualBase = false; |
| 1910 | } |
| 1911 | |
| 1912 | if (IsPrimaryVirtualBase) |
| 1913 | PrimaryVirtualBases.insert(PrimaryBase); |
| 1914 | } |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1915 | } |
| 1916 | |
| 1917 | // Traverse bases, looking for more primary virtual bases. |
| 1918 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1919 | E = RD->bases_end(); I != E; ++I) { |
| 1920 | const CXXRecordDecl *BaseDecl = |
| 1921 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 1922 | |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1923 | uint64_t BaseOffsetInLayoutClass; |
| 1924 | |
| 1925 | if (I->isVirtual()) { |
| 1926 | if (!VBases.insert(BaseDecl)) |
| 1927 | continue; |
| 1928 | |
| 1929 | const ASTRecordLayout &LayoutClassLayout = |
| 1930 | Context.getASTRecordLayout(LayoutClass); |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1931 | |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1932 | BaseOffsetInLayoutClass = |
| 1933 | LayoutClassLayout.getVBaseClassOffsetInBits(BaseDecl); |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1934 | } else { |
| 1935 | BaseOffsetInLayoutClass = |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1936 | OffsetInLayoutClass + Layout.getBaseClassOffsetInBits(BaseDecl); |
Anders Carlsson | 02b99d6 | 2010-03-10 03:02:01 +0000 | [diff] [blame] | 1937 | } |
| 1938 | |
| 1939 | DeterminePrimaryVirtualBases(BaseDecl, BaseOffsetInLayoutClass, VBases); |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1940 | } |
| 1941 | } |
| 1942 | |
| 1943 | void |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1944 | VTableBuilder::LayoutVTablesForVirtualBases(const CXXRecordDecl *RD, |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1945 | VisitedVirtualBasesSetTy &VBases) { |
| 1946 | // Itanium C++ ABI 2.5.2: |
| 1947 | // Then come the virtual base virtual tables, also in inheritance graph |
| 1948 | // order, and again excluding primary bases (which share virtual tables with |
| 1949 | // the classes for which they are primary). |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1950 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1951 | E = RD->bases_end(); I != E; ++I) { |
| 1952 | const CXXRecordDecl *BaseDecl = |
| 1953 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 1954 | |
Anders Carlsson | 0570f71 | 2010-02-23 03:48:14 +0000 | [diff] [blame] | 1955 | // Check if this base needs a vtable. (If it's virtual, not a primary base |
| 1956 | // of some other class, and we haven't visited it before). |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1957 | if (I->isVirtual() && BaseDecl->isDynamicClass() && |
Anders Carlsson | b08aaa3 | 2010-02-27 04:05:52 +0000 | [diff] [blame] | 1958 | !PrimaryVirtualBases.count(BaseDecl) && VBases.insert(BaseDecl)) { |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1959 | const ASTRecordLayout &MostDerivedClassLayout = |
| 1960 | Context.getASTRecordLayout(MostDerivedClass); |
| 1961 | uint64_t BaseOffset = |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1962 | MostDerivedClassLayout.getVBaseClassOffsetInBits(BaseDecl); |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1963 | |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1964 | const ASTRecordLayout &LayoutClassLayout = |
| 1965 | Context.getASTRecordLayout(LayoutClass); |
| 1966 | uint64_t BaseOffsetInLayoutClass = |
Anders Carlsson | fd88a61 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1967 | LayoutClassLayout.getVBaseClassOffsetInBits(BaseDecl); |
Anders Carlsson | e3385f5 | 2010-02-28 01:43:58 +0000 | [diff] [blame] | 1968 | |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 1969 | LayoutPrimaryAndSecondaryVTables( |
| 1970 | BaseSubobject(BaseDecl, Context.toCharUnitsFromBits(BaseOffset)), |
| 1971 | /*BaseIsMorallyVirtual=*/true, |
| 1972 | /*BaseIsVirtualInLayoutClass=*/true, |
| 1973 | BaseOffsetInLayoutClass); |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1974 | } |
| 1975 | |
| 1976 | // We only need to check the base for virtual base vtables if it actually |
| 1977 | // has virtual bases. |
| 1978 | if (BaseDecl->getNumVBases()) |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1979 | LayoutVTablesForVirtualBases(BaseDecl, VBases); |
Anders Carlsson | 13f0f66 | 2010-02-16 16:49:35 +0000 | [diff] [blame] | 1980 | } |
| 1981 | } |
| 1982 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1983 | /// dumpLayout - Dump the vtable layout. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 1984 | void VTableBuilder::dumpLayout(llvm::raw_ostream& Out) { |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1985 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 1986 | if (isBuildingConstructorVTable()) { |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1987 | Out << "Construction vtable for ('"; |
| 1988 | Out << MostDerivedClass->getQualifiedNameAsString() << "', "; |
| 1989 | // FIXME: Don't use / 8 . |
| 1990 | Out << MostDerivedClassOffset / 8 << ") in '"; |
| 1991 | Out << LayoutClass->getQualifiedNameAsString(); |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 1992 | } else { |
| 1993 | Out << "Vtable for '"; |
| 1994 | Out << MostDerivedClass->getQualifiedNameAsString(); |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 1995 | } |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 1996 | Out << "' (" << Components.size() << " entries).\n"; |
| 1997 | |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 1998 | // Iterate through the address points and insert them into a new map where |
| 1999 | // they are keyed by the index and not the base object. |
| 2000 | // Since an address point can be shared by multiple subobjects, we use an |
| 2001 | // STL multimap. |
| 2002 | std::multimap<uint64_t, BaseSubobject> AddressPointsByIndex; |
Anders Carlsson | 0534b02 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 2003 | for (AddressPointsMapTy::const_iterator I = AddressPoints.begin(), |
| 2004 | E = AddressPoints.end(); I != E; ++I) { |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2005 | const BaseSubobject& Base = I->first; |
| 2006 | uint64_t Index = I->second; |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2007 | |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2008 | AddressPointsByIndex.insert(std::make_pair(Index, Base)); |
| 2009 | } |
| 2010 | |
| 2011 | for (unsigned I = 0, E = Components.size(); I != E; ++I) { |
Anders Carlsson | e8a9756 | 2010-02-12 07:43:48 +0000 | [diff] [blame] | 2012 | uint64_t Index = I; |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2013 | |
| 2014 | Out << llvm::format("%4d | ", I); |
| 2015 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2016 | const VTableComponent &Component = Components[I]; |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2017 | |
| 2018 | // Dump the component. |
| 2019 | switch (Component.getKind()) { |
Anders Carlsson | b0a588f | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 2020 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2021 | case VTableComponent::CK_VCallOffset: |
Anders Carlsson | b0a588f | 2010-02-17 06:07:19 +0000 | [diff] [blame] | 2022 | Out << "vcall_offset (" << Component.getVCallOffset() << ")"; |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2023 | break; |
Anders Carlsson | 77904f1 | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 2024 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2025 | case VTableComponent::CK_VBaseOffset: |
Anders Carlsson | 77904f1 | 2010-02-16 04:59:55 +0000 | [diff] [blame] | 2026 | Out << "vbase_offset (" << Component.getVBaseOffset() << ")"; |
| 2027 | break; |
| 2028 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2029 | case VTableComponent::CK_OffsetToTop: |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2030 | Out << "offset_to_top (" << Component.getOffsetToTop() << ")"; |
| 2031 | break; |
| 2032 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2033 | case VTableComponent::CK_RTTI: |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2034 | Out << Component.getRTTIDecl()->getQualifiedNameAsString() << " RTTI"; |
| 2035 | break; |
| 2036 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2037 | case VTableComponent::CK_FunctionPointer: { |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2038 | const CXXMethodDecl *MD = Component.getFunctionDecl(); |
| 2039 | |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 2040 | std::string Str = |
| 2041 | PredefinedExpr::ComputeName(PredefinedExpr::PrettyFunctionNoVirtual, |
| 2042 | MD); |
| 2043 | Out << Str; |
Anders Carlsson | 09da337 | 2010-02-12 02:38:13 +0000 | [diff] [blame] | 2044 | if (MD->isPure()) |
| 2045 | Out << " [pure]"; |
| 2046 | |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2047 | ThunkInfo Thunk = VTableThunks.lookup(I); |
Anders Carlsson | 8a24029 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2048 | if (!Thunk.isEmpty()) { |
| 2049 | // If this function pointer has a return adjustment, dump it. |
| 2050 | if (!Thunk.Return.isEmpty()) { |
| 2051 | Out << "\n [return adjustment: "; |
| 2052 | Out << Thunk.Return.NonVirtual << " non-virtual"; |
| 2053 | |
| 2054 | if (Thunk.Return.VBaseOffsetOffset) { |
| 2055 | Out << ", " << Thunk.Return.VBaseOffsetOffset; |
| 2056 | Out << " vbase offset offset"; |
| 2057 | } |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 2058 | |
Anders Carlsson | 8a24029 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2059 | Out << ']'; |
| 2060 | } |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 2061 | |
Anders Carlsson | 8a24029 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2062 | // If this function pointer has a 'this' pointer adjustment, dump it. |
| 2063 | if (!Thunk.This.isEmpty()) { |
| 2064 | Out << "\n [this adjustment: "; |
| 2065 | Out << Thunk.This.NonVirtual << " non-virtual"; |
| 2066 | |
| 2067 | if (Thunk.This.VCallOffsetOffset) { |
| 2068 | Out << ", " << Thunk.This.VCallOffsetOffset; |
| 2069 | Out << " vcall offset offset"; |
| 2070 | } |
Anders Carlsson | 78277c7 | 2010-02-18 17:00:09 +0000 | [diff] [blame] | 2071 | |
Anders Carlsson | 8a24029 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2072 | Out << ']'; |
| 2073 | } |
Anders Carlsson | d3adb0c | 2010-02-13 23:40:17 +0000 | [diff] [blame] | 2074 | } |
Anders Carlsson | 6a6cbfc | 2010-02-13 20:11:51 +0000 | [diff] [blame] | 2075 | |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 2076 | break; |
| 2077 | } |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2078 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2079 | case VTableComponent::CK_CompleteDtorPointer: |
| 2080 | case VTableComponent::CK_DeletingDtorPointer: { |
Anders Carlsson | 2d3d903 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2081 | bool IsComplete = |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2082 | Component.getKind() == VTableComponent::CK_CompleteDtorPointer; |
Anders Carlsson | 2d3d903 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2083 | |
Anders Carlsson | 5bd8d19 | 2010-02-11 18:20:28 +0000 | [diff] [blame] | 2084 | const CXXDestructorDecl *DD = Component.getDestructorDecl(); |
| 2085 | |
Anders Carlsson | 2d3d903 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2086 | Out << DD->getQualifiedNameAsString(); |
| 2087 | if (IsComplete) |
| 2088 | Out << "() [complete]"; |
| 2089 | else |
| 2090 | Out << "() [deleting]"; |
| 2091 | |
Anders Carlsson | 09da337 | 2010-02-12 02:38:13 +0000 | [diff] [blame] | 2092 | if (DD->isPure()) |
| 2093 | Out << " [pure]"; |
| 2094 | |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2095 | ThunkInfo Thunk = VTableThunks.lookup(I); |
Anders Carlsson | 8a24029 | 2010-03-12 04:54:20 +0000 | [diff] [blame] | 2096 | if (!Thunk.isEmpty()) { |
| 2097 | // If this destructor has a 'this' pointer adjustment, dump it. |
| 2098 | if (!Thunk.This.isEmpty()) { |
| 2099 | Out << "\n [this adjustment: "; |
| 2100 | Out << Thunk.This.NonVirtual << " non-virtual"; |
| 2101 | |
| 2102 | if (Thunk.This.VCallOffsetOffset) { |
| 2103 | Out << ", " << Thunk.This.VCallOffsetOffset; |
| 2104 | Out << " vcall offset offset"; |
| 2105 | } |
| 2106 | |
| 2107 | Out << ']'; |
| 2108 | } |
| 2109 | } |
Anders Carlsson | 2d3d903 | 2010-02-19 06:03:53 +0000 | [diff] [blame] | 2110 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2111 | break; |
| 2112 | } |
| 2113 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2114 | case VTableComponent::CK_UnusedFunctionPointer: { |
Anders Carlsson | 350b56e | 2010-02-19 20:08:13 +0000 | [diff] [blame] | 2115 | const CXXMethodDecl *MD = Component.getUnusedFunctionDecl(); |
| 2116 | |
| 2117 | std::string Str = |
| 2118 | PredefinedExpr::ComputeName(PredefinedExpr::PrettyFunctionNoVirtual, |
| 2119 | MD); |
| 2120 | Out << "[unused] " << Str; |
| 2121 | if (MD->isPure()) |
| 2122 | Out << " [pure]"; |
| 2123 | } |
| 2124 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2125 | } |
Anders Carlsson | 932c2f2 | 2010-02-11 17:18:51 +0000 | [diff] [blame] | 2126 | |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2127 | Out << '\n'; |
Anders Carlsson | f98b47d3 | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2128 | |
| 2129 | // Dump the next address point. |
| 2130 | uint64_t NextIndex = Index + 1; |
| 2131 | if (AddressPointsByIndex.count(NextIndex)) { |
| 2132 | if (AddressPointsByIndex.count(NextIndex) == 1) { |
| 2133 | const BaseSubobject &Base = |
| 2134 | AddressPointsByIndex.find(NextIndex)->second; |
| 2135 | |
| 2136 | // FIXME: Instead of dividing by 8, we should be using CharUnits. |
| 2137 | Out << " -- (" << Base.getBase()->getQualifiedNameAsString(); |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 2138 | Out << ", " << Base.getBaseOffset().getQuantity(); |
| 2139 | Out << ") vtable address --\n"; |
Anders Carlsson | f98b47d3 | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2140 | } else { |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 2141 | CharUnits BaseOffset = |
| 2142 | AddressPointsByIndex.lower_bound(NextIndex)->second.getBaseOffset(); |
Anders Carlsson | f98b47d3 | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2143 | |
| 2144 | // We store the class names in a set to get a stable order. |
| 2145 | std::set<std::string> ClassNames; |
| 2146 | for (std::multimap<uint64_t, BaseSubobject>::const_iterator I = |
| 2147 | AddressPointsByIndex.lower_bound(NextIndex), E = |
| 2148 | AddressPointsByIndex.upper_bound(NextIndex); I != E; ++I) { |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 2149 | assert(I->second.getBaseOffset() == BaseOffset && |
Anders Carlsson | f98b47d3 | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2150 | "Invalid base offset!"); |
| 2151 | const CXXRecordDecl *RD = I->second.getBase(); |
| 2152 | ClassNames.insert(RD->getQualifiedNameAsString()); |
| 2153 | } |
| 2154 | |
| 2155 | for (std::set<std::string>::const_iterator I = ClassNames.begin(), |
| 2156 | E = ClassNames.end(); I != E; ++I) { |
Anders Carlsson | f98b47d3 | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2157 | Out << " -- (" << *I; |
Ken Dyck | ce81203 | 2011-03-26 00:51:24 +0000 | [diff] [blame] | 2158 | Out << ", " << BaseOffset.getQuantity() << ") vtable address --\n"; |
Anders Carlsson | f98b47d3 | 2010-02-27 23:58:01 +0000 | [diff] [blame] | 2159 | } |
| 2160 | } |
| 2161 | } |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2162 | } |
Anders Carlsson | 9391375 | 2010-02-27 20:39:05 +0000 | [diff] [blame] | 2163 | |
| 2164 | Out << '\n'; |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2165 | |
Anders Carlsson | d78b224 | 2010-04-11 22:07:06 +0000 | [diff] [blame] | 2166 | if (isBuildingConstructorVTable()) |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2167 | return; |
| 2168 | |
| 2169 | if (MostDerivedClass->getNumVBases()) { |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2170 | // We store the virtual base class names and their offsets in a map to get |
| 2171 | // a stable order. |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2172 | |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2173 | std::map<std::string, int64_t> ClassNamesAndOffsets; |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2174 | for (VBaseOffsetOffsetsMapTy::const_iterator I = VBaseOffsetOffsets.begin(), |
| 2175 | E = VBaseOffsetOffsets.end(); I != E; ++I) { |
| 2176 | std::string ClassName = I->first->getQualifiedNameAsString(); |
| 2177 | int64_t OffsetOffset = I->second; |
| 2178 | ClassNamesAndOffsets.insert(std::make_pair(ClassName, OffsetOffset)); |
| 2179 | } |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2180 | |
| 2181 | Out << "Virtual base offset offsets for '"; |
| 2182 | Out << MostDerivedClass->getQualifiedNameAsString() << "' ("; |
| 2183 | Out << ClassNamesAndOffsets.size(); |
| 2184 | Out << (ClassNamesAndOffsets.size() == 1 ? " entry" : " entries") << ").\n"; |
Anders Carlsson | 7f6b71e | 2010-03-11 06:43:12 +0000 | [diff] [blame] | 2185 | |
| 2186 | for (std::map<std::string, int64_t>::const_iterator I = |
| 2187 | ClassNamesAndOffsets.begin(), E = ClassNamesAndOffsets.end(); |
| 2188 | I != E; ++I) |
| 2189 | Out << " " << I->first << " | " << I->second << '\n'; |
| 2190 | |
| 2191 | Out << "\n"; |
| 2192 | } |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2193 | |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2194 | if (!Thunks.empty()) { |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2195 | // We store the method names in a map to get a stable order. |
| 2196 | std::map<std::string, const CXXMethodDecl *> MethodNamesAndDecls; |
| 2197 | |
Anders Carlsson | 917229c | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2198 | for (ThunksMapTy::const_iterator I = Thunks.begin(), E = Thunks.end(); |
Anders Carlsson | 7cea12f | 2010-03-23 04:44:10 +0000 | [diff] [blame] | 2199 | I != E; ++I) { |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2200 | const CXXMethodDecl *MD = I->first; |
| 2201 | std::string MethodName = |
| 2202 | PredefinedExpr::ComputeName(PredefinedExpr::PrettyFunctionNoVirtual, |
| 2203 | MD); |
| 2204 | |
| 2205 | MethodNamesAndDecls.insert(std::make_pair(MethodName, MD)); |
| 2206 | } |
| 2207 | |
| 2208 | for (std::map<std::string, const CXXMethodDecl *>::const_iterator I = |
| 2209 | MethodNamesAndDecls.begin(), E = MethodNamesAndDecls.end(); |
| 2210 | I != E; ++I) { |
| 2211 | const std::string &MethodName = I->first; |
| 2212 | const CXXMethodDecl *MD = I->second; |
Anders Carlsson | 7eb99a6 | 2010-03-22 16:30:44 +0000 | [diff] [blame] | 2213 | |
Anders Carlsson | 917229c | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2214 | ThunkInfoVectorTy ThunksVector = Thunks[MD]; |
Anders Carlsson | 7eb99a6 | 2010-03-22 16:30:44 +0000 | [diff] [blame] | 2215 | std::sort(ThunksVector.begin(), ThunksVector.end()); |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2216 | |
| 2217 | Out << "Thunks for '" << MethodName << "' (" << ThunksVector.size(); |
| 2218 | Out << (ThunksVector.size() == 1 ? " entry" : " entries") << ").\n"; |
| 2219 | |
| 2220 | for (unsigned I = 0, E = ThunksVector.size(); I != E; ++I) { |
| 2221 | const ThunkInfo &Thunk = ThunksVector[I]; |
| 2222 | |
| 2223 | Out << llvm::format("%4d | ", I); |
| 2224 | |
Anders Carlsson | 53a47bf | 2010-03-22 16:10:59 +0000 | [diff] [blame] | 2225 | // If this function pointer has a return pointer adjustment, dump it. |
| 2226 | if (!Thunk.Return.isEmpty()) { |
| 2227 | Out << "return adjustment: " << Thunk.This.NonVirtual; |
| 2228 | Out << " non-virtual"; |
| 2229 | if (Thunk.Return.VBaseOffsetOffset) { |
| 2230 | Out << ", " << Thunk.Return.VBaseOffsetOffset; |
| 2231 | Out << " vbase offset offset"; |
| 2232 | } |
| 2233 | |
| 2234 | if (!Thunk.This.isEmpty()) |
| 2235 | Out << "\n "; |
| 2236 | } |
| 2237 | |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2238 | // If this function pointer has a 'this' pointer adjustment, dump it. |
| 2239 | if (!Thunk.This.isEmpty()) { |
Anders Carlsson | 53a47bf | 2010-03-22 16:10:59 +0000 | [diff] [blame] | 2240 | Out << "this adjustment: "; |
| 2241 | Out << Thunk.This.NonVirtual << " non-virtual"; |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2242 | |
| 2243 | if (Thunk.This.VCallOffsetOffset) { |
| 2244 | Out << ", " << Thunk.This.VCallOffsetOffset; |
Anders Carlsson | 53a47bf | 2010-03-22 16:10:59 +0000 | [diff] [blame] | 2245 | Out << " vcall offset offset"; |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2246 | } |
| 2247 | } |
| 2248 | |
| 2249 | Out << '\n'; |
| 2250 | } |
Anders Carlsson | 290c6ed | 2010-03-22 20:06:40 +0000 | [diff] [blame] | 2251 | |
| 2252 | Out << '\n'; |
| 2253 | |
Anders Carlsson | 18c582d | 2010-03-18 02:44:19 +0000 | [diff] [blame] | 2254 | } |
| 2255 | } |
Anders Carlsson | 5d40c6f | 2010-02-11 08:02:13 +0000 | [diff] [blame] | 2256 | } |
| 2257 | |
| 2258 | } |
| 2259 | |
Anders Carlsson | cadbc46 | 2010-11-24 23:04:03 +0000 | [diff] [blame] | 2260 | static void |
| 2261 | CollectPrimaryBases(const CXXRecordDecl *RD, ASTContext &Context, |
| 2262 | VTableBuilder::PrimaryBasesSetVectorTy &PrimaryBases) { |
| 2263 | while (RD) { |
| 2264 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| 2265 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 2266 | if (PrimaryBase) |
| 2267 | PrimaryBases.insert(PrimaryBase); |
| 2268 | |
| 2269 | RD = PrimaryBase; |
| 2270 | } |
| 2271 | } |
| 2272 | |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2273 | void CodeGenVTables::ComputeMethodVTableIndices(const CXXRecordDecl *RD) { |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2274 | |
| 2275 | // Itanium C++ ABI 2.5.2: |
Anders Carlsson | 259688c | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 2276 | // The order of the virtual function pointers in a virtual table is the |
| 2277 | // order of declaration of the corresponding member functions in the class. |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2278 | // |
Anders Carlsson | 259688c | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 2279 | // There is an entry for any virtual function declared in a class, |
| 2280 | // whether it is a new function or overrides a base class function, |
| 2281 | // unless it overrides a function from the primary base, and conversion |
| 2282 | // between their return types does not require an adjustment. |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2283 | |
| 2284 | int64_t CurrentIndex = 0; |
| 2285 | |
| 2286 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 2287 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 2288 | |
| 2289 | if (PrimaryBase) { |
Anders Carlsson | c920fa2 | 2009-11-30 19:43:26 +0000 | [diff] [blame] | 2290 | assert(PrimaryBase->isDefinition() && |
| 2291 | "Should have the definition decl of the primary base!"); |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2292 | |
| 2293 | // Since the record decl shares its vtable pointer with the primary base |
| 2294 | // we need to start counting at the end of the primary base's vtable. |
| 2295 | CurrentIndex = getNumVirtualFunctionPointers(PrimaryBase); |
| 2296 | } |
Eli Friedman | 2151725 | 2009-12-15 03:31:17 +0000 | [diff] [blame] | 2297 | |
| 2298 | // Collect all the primary bases, so we can check whether methods override |
| 2299 | // a method from the base. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2300 | VTableBuilder::PrimaryBasesSetVectorTy PrimaryBases; |
Anders Carlsson | cadbc46 | 2010-11-24 23:04:03 +0000 | [diff] [blame] | 2301 | CollectPrimaryBases(RD, CGM.getContext(), PrimaryBases); |
Eli Friedman | 2151725 | 2009-12-15 03:31:17 +0000 | [diff] [blame] | 2302 | |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2303 | const CXXDestructorDecl *ImplicitVirtualDtor = 0; |
| 2304 | |
| 2305 | for (CXXRecordDecl::method_iterator i = RD->method_begin(), |
| 2306 | e = RD->method_end(); i != e; ++i) { |
| 2307 | const CXXMethodDecl *MD = *i; |
| 2308 | |
| 2309 | // We only want virtual methods. |
| 2310 | if (!MD->isVirtual()) |
| 2311 | continue; |
| 2312 | |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2313 | // Check if this method overrides a method in the primary base. |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2314 | if (const CXXMethodDecl *OverriddenMD = |
Anders Carlsson | 88cf34f | 2010-04-10 20:39:29 +0000 | [diff] [blame] | 2315 | FindNearestOverriddenMethod(MD, PrimaryBases)) { |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2316 | // Check if converting from the return type of the method to the |
| 2317 | // return type of the overridden method requires conversion. |
Anders Carlsson | cce9ee8 | 2010-02-13 23:17:31 +0000 | [diff] [blame] | 2318 | if (ComputeReturnAdjustmentBaseOffset(CGM.getContext(), MD, |
| 2319 | OverriddenMD).isEmpty()) { |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2320 | // This index is shared between the index in the vtable of the primary |
| 2321 | // base class. |
| 2322 | if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) { |
| 2323 | const CXXDestructorDecl *OverriddenDD = |
| 2324 | cast<CXXDestructorDecl>(OverriddenMD); |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2325 | |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2326 | // Add both the complete and deleting entries. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2327 | MethodVTableIndices[GlobalDecl(DD, Dtor_Complete)] = |
| 2328 | getMethodVTableIndex(GlobalDecl(OverriddenDD, Dtor_Complete)); |
| 2329 | MethodVTableIndices[GlobalDecl(DD, Dtor_Deleting)] = |
| 2330 | getMethodVTableIndex(GlobalDecl(OverriddenDD, Dtor_Deleting)); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2331 | } else { |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2332 | MethodVTableIndices[MD] = getMethodVTableIndex(OverriddenMD); |
Anders Carlsson | 65b4978 | 2010-02-12 05:25:12 +0000 | [diff] [blame] | 2333 | } |
| 2334 | |
| 2335 | // We don't need to add an entry for this method. |
Anders Carlsson | 0760481 | 2010-02-12 18:14:46 +0000 | [diff] [blame] | 2336 | continue; |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2337 | } |
| 2338 | } |
| 2339 | |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2340 | if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) { |
| 2341 | if (MD->isImplicit()) { |
| 2342 | assert(!ImplicitVirtualDtor && |
| 2343 | "Did already see an implicit virtual dtor!"); |
| 2344 | ImplicitVirtualDtor = DD; |
| 2345 | continue; |
| 2346 | } |
Tilmann Scheller | e60baf7 | 2011-03-02 20:40:50 +0000 | [diff] [blame] | 2347 | |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2348 | // Add the complete dtor. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2349 | MethodVTableIndices[GlobalDecl(DD, Dtor_Complete)] = CurrentIndex++; |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2350 | |
| 2351 | // Add the deleting dtor. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2352 | MethodVTableIndices[GlobalDecl(DD, Dtor_Deleting)] = CurrentIndex++; |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2353 | } else { |
| 2354 | // Add the entry. |
Tilmann Scheller | e60baf7 | 2011-03-02 20:40:50 +0000 | [diff] [blame] | 2355 | MethodVTableIndices[MD] = CurrentIndex++; |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2356 | } |
| 2357 | } |
| 2358 | |
| 2359 | if (ImplicitVirtualDtor) { |
| 2360 | // Itanium C++ ABI 2.5.2: |
Anders Carlsson | dc2dba3 | 2010-02-16 04:49:44 +0000 | [diff] [blame] | 2361 | // If a class has an implicitly-defined virtual destructor, |
| 2362 | // its entries come after the declared virtual function pointers. |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2363 | |
| 2364 | // Add the complete dtor. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2365 | MethodVTableIndices[GlobalDecl(ImplicitVirtualDtor, Dtor_Complete)] = |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2366 | CurrentIndex++; |
| 2367 | |
| 2368 | // Add the deleting dtor. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2369 | MethodVTableIndices[GlobalDecl(ImplicitVirtualDtor, Dtor_Deleting)] = |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2370 | CurrentIndex++; |
| 2371 | } |
| 2372 | |
| 2373 | NumVirtualFunctionPointers[RD] = CurrentIndex; |
| 2374 | } |
| 2375 | |
Argyrios Kyrtzidis | 0c34b13 | 2010-10-11 03:25:57 +0000 | [diff] [blame] | 2376 | bool CodeGenVTables::ShouldEmitVTableInThisTU(const CXXRecordDecl *RD) { |
| 2377 | assert(RD->isDynamicClass() && "Non dynamic classes have no VTable."); |
| 2378 | |
| 2379 | TemplateSpecializationKind TSK = RD->getTemplateSpecializationKind(); |
| 2380 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
| 2381 | return false; |
| 2382 | |
| 2383 | const CXXMethodDecl *KeyFunction = CGM.getContext().getKeyFunction(RD); |
| 2384 | if (!KeyFunction) |
| 2385 | return true; |
| 2386 | |
| 2387 | // Itanium C++ ABI, 5.2.6 Instantiated Templates: |
| 2388 | // An instantiation of a class template requires: |
| 2389 | // - In the object where instantiated, the virtual table... |
| 2390 | if (TSK == TSK_ImplicitInstantiation || |
| 2391 | TSK == TSK_ExplicitInstantiationDefinition) |
| 2392 | return true; |
| 2393 | |
Anders Carlsson | a03f3a8 | 2011-01-30 20:45:54 +0000 | [diff] [blame] | 2394 | // If we're building with optimization, we always emit VTables since that |
| 2395 | // allows for virtual function calls to be devirtualized. |
| 2396 | // (We don't want to do this in -fapple-kext mode however). |
| 2397 | if (CGM.getCodeGenOpts().OptimizationLevel && !CGM.getLangOptions().AppleKext) |
| 2398 | return true; |
| 2399 | |
Argyrios Kyrtzidis | 0c34b13 | 2010-10-11 03:25:57 +0000 | [diff] [blame] | 2400 | return KeyFunction->hasBody(); |
| 2401 | } |
| 2402 | |
Anders Carlsson | a864caf | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 2403 | uint64_t CodeGenVTables::getNumVirtualFunctionPointers(const CXXRecordDecl *RD) { |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2404 | llvm::DenseMap<const CXXRecordDecl *, uint64_t>::iterator I = |
| 2405 | NumVirtualFunctionPointers.find(RD); |
| 2406 | if (I != NumVirtualFunctionPointers.end()) |
| 2407 | return I->second; |
| 2408 | |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2409 | ComputeMethodVTableIndices(RD); |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2410 | |
| 2411 | I = NumVirtualFunctionPointers.find(RD); |
| 2412 | assert(I != NumVirtualFunctionPointers.end() && "Did not find entry!"); |
| 2413 | return I->second; |
| 2414 | } |
| 2415 | |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2416 | uint64_t CodeGenVTables::getMethodVTableIndex(GlobalDecl GD) { |
| 2417 | MethodVTableIndicesTy::iterator I = MethodVTableIndices.find(GD); |
| 2418 | if (I != MethodVTableIndices.end()) |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2419 | return I->second; |
| 2420 | |
Anders Carlsson | fb4dda4 | 2009-11-13 17:08:56 +0000 | [diff] [blame] | 2421 | const CXXRecordDecl *RD = cast<CXXMethodDecl>(GD.getDecl())->getParent(); |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2422 | |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2423 | ComputeMethodVTableIndices(RD); |
Anders Carlsson | f942ee0 | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 2424 | |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 2425 | I = MethodVTableIndices.find(GD); |
| 2426 | assert(I != MethodVTableIndices.end() && "Did not find index!"); |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2427 | return I->second; |
| 2428 | } |
| 2429 | |
Anders Carlsson | a864caf | 2010-03-23 04:11:45 +0000 | [diff] [blame] | 2430 | int64_t CodeGenVTables::getVirtualBaseOffsetOffset(const CXXRecordDecl *RD, |
| 2431 | const CXXRecordDecl *VBase) { |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2432 | ClassPairTy ClassPair(RD, VBase); |
| 2433 | |
Anders Carlsson | 4cbe83c | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2434 | VirtualBaseClassOffsetOffsetsMapTy::iterator I = |
| 2435 | VirtualBaseClassOffsetOffsets.find(ClassPair); |
| 2436 | if (I != VirtualBaseClassOffsetOffsets.end()) |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2437 | return I->second; |
| 2438 | |
Anders Carlsson | dd819c9 | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 2439 | VCallAndVBaseOffsetBuilder Builder(RD, RD, /*FinalOverriders=*/0, |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 2440 | BaseSubobject(RD, CharUnits::Zero()), |
Anders Carlsson | dd819c9 | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 2441 | /*BaseIsVirtual=*/false, |
| 2442 | /*OffsetInLayoutClass=*/0); |
Anders Carlsson | dd819c9 | 2010-03-11 16:06:20 +0000 | [diff] [blame] | 2443 | |
| 2444 | for (VCallAndVBaseOffsetBuilder::VBaseOffsetOffsetsMapTy::const_iterator I = |
| 2445 | Builder.getVBaseOffsetOffsets().begin(), |
| 2446 | E = Builder.getVBaseOffsetOffsets().end(); I != E; ++I) { |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2447 | // Insert all types. |
| 2448 | ClassPairTy ClassPair(RD, I->first); |
| 2449 | |
Anders Carlsson | 4cbe83c | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2450 | VirtualBaseClassOffsetOffsets.insert(std::make_pair(ClassPair, I->second)); |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2451 | } |
| 2452 | |
Anders Carlsson | 4cbe83c | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2453 | I = VirtualBaseClassOffsetOffsets.find(ClassPair); |
Anders Carlsson | 4cbe83c | 2010-03-11 07:15:17 +0000 | [diff] [blame] | 2454 | assert(I != VirtualBaseClassOffsetOffsets.end() && "Did not find index!"); |
Anders Carlsson | 2bb27f5 | 2009-10-11 22:13:54 +0000 | [diff] [blame] | 2455 | |
| 2456 | return I->second; |
| 2457 | } |
| 2458 | |
Anders Carlsson | f6f24c6 | 2010-03-29 02:08:26 +0000 | [diff] [blame] | 2459 | uint64_t |
| 2460 | CodeGenVTables::getAddressPoint(BaseSubobject Base, const CXXRecordDecl *RD) { |
Anders Carlsson | ae9e9a6 | 2010-04-08 16:18:36 +0000 | [diff] [blame] | 2461 | assert(AddressPoints.count(std::make_pair(RD, Base)) && |
| 2462 | "Did not find address point!"); |
| 2463 | |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 2464 | uint64_t AddressPoint = AddressPoints.lookup(std::make_pair(RD, Base)); |
Anders Carlsson | f6f24c6 | 2010-03-29 02:08:26 +0000 | [diff] [blame] | 2465 | assert(AddressPoint && "Address point must not be zero!"); |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 2466 | |
Anders Carlsson | f6f24c6 | 2010-03-29 02:08:26 +0000 | [diff] [blame] | 2467 | return AddressPoint; |
| 2468 | } |
| 2469 | |
Anders Carlsson | cd836f0 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2470 | llvm::Constant *CodeGenModule::GetAddrOfThunk(GlobalDecl GD, |
Anders Carlsson | fe8a993 | 2011-02-06 17:15:43 +0000 | [diff] [blame] | 2471 | const ThunkInfo &Thunk) { |
Anders Carlsson | cd836f0 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2472 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
| 2473 | |
| 2474 | // Compute the mangled name. |
| 2475 | llvm::SmallString<256> Name; |
Rafael Espindola | 3968cd0 | 2011-02-11 02:52:17 +0000 | [diff] [blame] | 2476 | llvm::raw_svector_ostream Out(Name); |
Anders Carlsson | cd836f0 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2477 | if (const CXXDestructorDecl* DD = dyn_cast<CXXDestructorDecl>(MD)) |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2478 | getCXXABI().getMangleContext().mangleCXXDtorThunk(DD, GD.getDtorType(), |
Rafael Espindola | 3968cd0 | 2011-02-11 02:52:17 +0000 | [diff] [blame] | 2479 | Thunk.This, Out); |
Anders Carlsson | cd836f0 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2480 | else |
Rafael Espindola | 3968cd0 | 2011-02-11 02:52:17 +0000 | [diff] [blame] | 2481 | getCXXABI().getMangleContext().mangleThunk(MD, Thunk, Out); |
| 2482 | Out.flush(); |
| 2483 | |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2484 | const llvm::Type *Ty = getTypes().GetFunctionTypeForVTable(GD); |
Anders Carlsson | fe8a993 | 2011-02-06 17:15:43 +0000 | [diff] [blame] | 2485 | return GetOrCreateLLVMFunction(Name, Ty, GD, /*ForVTable=*/true); |
Anders Carlsson | cd836f0 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2486 | } |
| 2487 | |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2488 | static llvm::Value *PerformTypeAdjustment(CodeGenFunction &CGF, |
| 2489 | llvm::Value *Ptr, |
| 2490 | int64_t NonVirtualAdjustment, |
| 2491 | int64_t VirtualAdjustment) { |
| 2492 | if (!NonVirtualAdjustment && !VirtualAdjustment) |
| 2493 | return Ptr; |
| 2494 | |
| 2495 | const llvm::Type *Int8PtrTy = |
| 2496 | llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 2497 | |
| 2498 | llvm::Value *V = CGF.Builder.CreateBitCast(Ptr, Int8PtrTy); |
| 2499 | |
| 2500 | if (NonVirtualAdjustment) { |
| 2501 | // Do the non-virtual adjustment. |
| 2502 | V = CGF.Builder.CreateConstInBoundsGEP1_64(V, NonVirtualAdjustment); |
| 2503 | } |
| 2504 | |
| 2505 | if (VirtualAdjustment) { |
| 2506 | const llvm::Type *PtrDiffTy = |
| 2507 | CGF.ConvertType(CGF.getContext().getPointerDiffType()); |
| 2508 | |
| 2509 | // Do the virtual adjustment. |
| 2510 | llvm::Value *VTablePtrPtr = |
| 2511 | CGF.Builder.CreateBitCast(V, Int8PtrTy->getPointerTo()); |
| 2512 | |
| 2513 | llvm::Value *VTablePtr = CGF.Builder.CreateLoad(VTablePtrPtr); |
| 2514 | |
| 2515 | llvm::Value *OffsetPtr = |
| 2516 | CGF.Builder.CreateConstInBoundsGEP1_64(VTablePtr, VirtualAdjustment); |
| 2517 | |
| 2518 | OffsetPtr = CGF.Builder.CreateBitCast(OffsetPtr, PtrDiffTy->getPointerTo()); |
| 2519 | |
| 2520 | // Load the adjustment offset from the vtable. |
| 2521 | llvm::Value *Offset = CGF.Builder.CreateLoad(OffsetPtr); |
| 2522 | |
| 2523 | // Adjust our pointer. |
| 2524 | V = CGF.Builder.CreateInBoundsGEP(V, Offset); |
| 2525 | } |
| 2526 | |
| 2527 | // Cast back to the original type. |
| 2528 | return CGF.Builder.CreateBitCast(V, Ptr->getType()); |
| 2529 | } |
| 2530 | |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2531 | static void setThunkVisibility(CodeGenModule &CGM, const CXXMethodDecl *MD, |
| 2532 | const ThunkInfo &Thunk, llvm::Function *Fn) { |
Anders Carlsson | c6a4789 | 2011-01-29 19:39:23 +0000 | [diff] [blame] | 2533 | CGM.setGlobalVisibility(Fn, MD); |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2534 | |
John McCall | b3732bb | 2010-08-12 23:36:15 +0000 | [diff] [blame] | 2535 | if (!CGM.getCodeGenOpts().HiddenWeakVTables) |
| 2536 | return; |
| 2537 | |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2538 | // If the thunk has weak/linkonce linkage, but the function must be |
| 2539 | // emitted in every translation unit that references it, then we can |
| 2540 | // emit its thunks with hidden visibility, since its thunks must be |
| 2541 | // emitted when the function is. |
| 2542 | |
John McCall | 5513fce9 | 2010-08-05 20:39:18 +0000 | [diff] [blame] | 2543 | // This follows CodeGenModule::setTypeVisibility; see the comments |
| 2544 | // there for explanation. |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2545 | |
| 2546 | if ((Fn->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage && |
| 2547 | Fn->getLinkage() != llvm::GlobalVariable::WeakODRLinkage) || |
| 2548 | Fn->getVisibility() != llvm::GlobalVariable::DefaultVisibility) |
| 2549 | return; |
| 2550 | |
Douglas Gregor | 1baf38f | 2011-03-26 12:10:19 +0000 | [diff] [blame] | 2551 | if (MD->getExplicitVisibility()) |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2552 | return; |
| 2553 | |
| 2554 | switch (MD->getTemplateSpecializationKind()) { |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2555 | case TSK_ExplicitInstantiationDefinition: |
| 2556 | case TSK_ExplicitInstantiationDeclaration: |
| 2557 | return; |
| 2558 | |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2559 | case TSK_Undeclared: |
| 2560 | break; |
| 2561 | |
John McCall | 5513fce9 | 2010-08-05 20:39:18 +0000 | [diff] [blame] | 2562 | case TSK_ExplicitSpecialization: |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2563 | case TSK_ImplicitInstantiation: |
John McCall | b3732bb | 2010-08-12 23:36:15 +0000 | [diff] [blame] | 2564 | if (!CGM.getCodeGenOpts().HiddenWeakTemplateVTables) |
John McCall | 5513fce9 | 2010-08-05 20:39:18 +0000 | [diff] [blame] | 2565 | return; |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2566 | break; |
| 2567 | } |
| 2568 | |
| 2569 | // If there's an explicit definition, and that definition is |
| 2570 | // out-of-line, then we can't assume that all users will have a |
| 2571 | // definition to emit. |
| 2572 | const FunctionDecl *Def = 0; |
| 2573 | if (MD->hasBody(Def) && Def->isOutOfLine()) |
| 2574 | return; |
| 2575 | |
| 2576 | Fn->setVisibility(llvm::GlobalValue::HiddenVisibility); |
| 2577 | } |
| 2578 | |
John McCall | 5fe0096 | 2011-03-09 07:12:35 +0000 | [diff] [blame] | 2579 | #ifndef NDEBUG |
| 2580 | static bool similar(const ABIArgInfo &infoL, CanQualType typeL, |
| 2581 | const ABIArgInfo &infoR, CanQualType typeR) { |
| 2582 | return (infoL.getKind() == infoR.getKind() && |
| 2583 | (typeL == typeR || |
| 2584 | (isa<PointerType>(typeL) && isa<PointerType>(typeR)) || |
| 2585 | (isa<ReferenceType>(typeL) && isa<ReferenceType>(typeR)))); |
| 2586 | } |
| 2587 | #endif |
| 2588 | |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2589 | void CodeGenFunction::GenerateThunk(llvm::Function *Fn, |
| 2590 | const CGFunctionInfo &FnInfo, |
| 2591 | GlobalDecl GD, const ThunkInfo &Thunk) { |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2592 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
| 2593 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 2594 | QualType ResultType = FPT->getResultType(); |
| 2595 | QualType ThisType = MD->getThisType(getContext()); |
| 2596 | |
| 2597 | FunctionArgList FunctionArgs; |
| 2598 | |
| 2599 | // FIXME: It would be nice if more of this code could be shared with |
| 2600 | // CodeGenFunction::GenerateCode. |
| 2601 | |
| 2602 | // Create the implicit 'this' parameter declaration. |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2603 | CurGD = GD; |
| 2604 | CGM.getCXXABI().BuildInstanceFunctionParams(*this, ResultType, FunctionArgs); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2605 | |
| 2606 | // Add the rest of the parameters. |
| 2607 | for (FunctionDecl::param_const_iterator I = MD->param_begin(), |
| 2608 | E = MD->param_end(); I != E; ++I) { |
| 2609 | ParmVarDecl *Param = *I; |
| 2610 | |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2611 | FunctionArgs.push_back(Param); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2612 | } |
Tilmann Scheller | 99cc30c | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 2613 | |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2614 | StartFunction(GlobalDecl(), ResultType, Fn, FnInfo, FunctionArgs, |
| 2615 | SourceLocation()); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2616 | |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2617 | CGM.getCXXABI().EmitInstanceFunctionProlog(*this); |
| 2618 | |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2619 | // Adjust the 'this' pointer if necessary. |
| 2620 | llvm::Value *AdjustedThisPtr = |
| 2621 | PerformTypeAdjustment(*this, LoadCXXThis(), |
| 2622 | Thunk.This.NonVirtual, |
| 2623 | Thunk.This.VCallOffsetOffset); |
| 2624 | |
| 2625 | CallArgList CallArgs; |
| 2626 | |
| 2627 | // Add our adjusted 'this' pointer. |
| 2628 | CallArgs.push_back(std::make_pair(RValue::get(AdjustedThisPtr), ThisType)); |
| 2629 | |
| 2630 | // Add the rest of the parameters. |
| 2631 | for (FunctionDecl::param_const_iterator I = MD->param_begin(), |
| 2632 | E = MD->param_end(); I != E; ++I) { |
John McCall | 32ea969 | 2011-03-11 20:59:21 +0000 | [diff] [blame] | 2633 | ParmVarDecl *param = *I; |
| 2634 | EmitDelegateCallArg(CallArgs, param); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2635 | } |
| 2636 | |
| 2637 | // Get our callee. |
| 2638 | const llvm::Type *Ty = |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2639 | CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(GD), |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2640 | FPT->isVariadic()); |
Anders Carlsson | fe8a993 | 2011-02-06 17:15:43 +0000 | [diff] [blame] | 2641 | llvm::Value *Callee = CGM.GetAddrOfFunction(GD, Ty, /*ForVTable=*/true); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2642 | |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2643 | #ifndef NDEBUG |
| 2644 | const CGFunctionInfo &CallFnInfo = |
| 2645 | CGM.getTypes().getFunctionInfo(ResultType, CallArgs, FPT->getExtInfo()); |
John McCall | 5fe0096 | 2011-03-09 07:12:35 +0000 | [diff] [blame] | 2646 | assert(CallFnInfo.getRegParm() == FnInfo.getRegParm() && |
| 2647 | CallFnInfo.isNoReturn() == FnInfo.isNoReturn() && |
| 2648 | CallFnInfo.getCallingConvention() == FnInfo.getCallingConvention()); |
| 2649 | assert(similar(CallFnInfo.getReturnInfo(), CallFnInfo.getReturnType(), |
| 2650 | FnInfo.getReturnInfo(), FnInfo.getReturnType())); |
| 2651 | assert(CallFnInfo.arg_size() == FnInfo.arg_size()); |
| 2652 | for (unsigned i = 0, e = FnInfo.arg_size(); i != e; ++i) |
| 2653 | assert(similar(CallFnInfo.arg_begin()[i].info, |
| 2654 | CallFnInfo.arg_begin()[i].type, |
| 2655 | FnInfo.arg_begin()[i].info, FnInfo.arg_begin()[i].type)); |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2656 | #endif |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2657 | |
Douglas Gregor | aa2ac80 | 2010-05-20 05:54:35 +0000 | [diff] [blame] | 2658 | // Determine whether we have a return value slot to use. |
| 2659 | ReturnValueSlot Slot; |
| 2660 | if (!ResultType->isVoidType() && |
| 2661 | FnInfo.getReturnInfo().getKind() == ABIArgInfo::Indirect && |
| 2662 | hasAggregateLLVMType(CurFnInfo->getReturnType())) |
| 2663 | Slot = ReturnValueSlot(ReturnValue, ResultType.isVolatileQualified()); |
| 2664 | |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2665 | // Now emit our call. |
Douglas Gregor | aa2ac80 | 2010-05-20 05:54:35 +0000 | [diff] [blame] | 2666 | RValue RV = EmitCall(FnInfo, Callee, Slot, CallArgs, MD); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2667 | |
| 2668 | if (!Thunk.Return.isEmpty()) { |
| 2669 | // Emit the return adjustment. |
| 2670 | bool NullCheckValue = !ResultType->isReferenceType(); |
| 2671 | |
| 2672 | llvm::BasicBlock *AdjustNull = 0; |
| 2673 | llvm::BasicBlock *AdjustNotNull = 0; |
| 2674 | llvm::BasicBlock *AdjustEnd = 0; |
| 2675 | |
| 2676 | llvm::Value *ReturnValue = RV.getScalarVal(); |
| 2677 | |
| 2678 | if (NullCheckValue) { |
| 2679 | AdjustNull = createBasicBlock("adjust.null"); |
| 2680 | AdjustNotNull = createBasicBlock("adjust.notnull"); |
| 2681 | AdjustEnd = createBasicBlock("adjust.end"); |
| 2682 | |
| 2683 | llvm::Value *IsNull = Builder.CreateIsNull(ReturnValue); |
| 2684 | Builder.CreateCondBr(IsNull, AdjustNull, AdjustNotNull); |
| 2685 | EmitBlock(AdjustNotNull); |
| 2686 | } |
| 2687 | |
| 2688 | ReturnValue = PerformTypeAdjustment(*this, ReturnValue, |
| 2689 | Thunk.Return.NonVirtual, |
| 2690 | Thunk.Return.VBaseOffsetOffset); |
| 2691 | |
| 2692 | if (NullCheckValue) { |
| 2693 | Builder.CreateBr(AdjustEnd); |
| 2694 | EmitBlock(AdjustNull); |
| 2695 | Builder.CreateBr(AdjustEnd); |
| 2696 | EmitBlock(AdjustEnd); |
| 2697 | |
| 2698 | llvm::PHINode *PHI = Builder.CreatePHI(ReturnValue->getType()); |
| 2699 | PHI->reserveOperandSpace(2); |
| 2700 | PHI->addIncoming(ReturnValue, AdjustNotNull); |
| 2701 | PHI->addIncoming(llvm::Constant::getNullValue(ReturnValue->getType()), |
| 2702 | AdjustNull); |
| 2703 | ReturnValue = PHI; |
| 2704 | } |
| 2705 | |
| 2706 | RV = RValue::get(ReturnValue); |
| 2707 | } |
| 2708 | |
Douglas Gregor | aa2ac80 | 2010-05-20 05:54:35 +0000 | [diff] [blame] | 2709 | if (!ResultType->isVoidType() && Slot.isNull()) |
John McCall | ad7c5c1 | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 2710 | CGM.getCXXABI().EmitReturnFromThunk(*this, RV, ResultType); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2711 | |
| 2712 | FinishFunction(); |
| 2713 | |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2714 | // Set the right linkage. |
John McCall | 7cb0220 | 2010-05-25 04:30:21 +0000 | [diff] [blame] | 2715 | CGM.setFunctionLinkage(MD, Fn); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2716 | |
| 2717 | // Set the right visibility. |
John McCall | c8bd9c2 | 2010-08-04 23:46:35 +0000 | [diff] [blame] | 2718 | setThunkVisibility(CGM, MD, Thunk, Fn); |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2719 | } |
| 2720 | |
Anders Carlsson | 8b02183 | 2011-02-06 18:31:40 +0000 | [diff] [blame] | 2721 | void CodeGenVTables::EmitThunk(GlobalDecl GD, const ThunkInfo &Thunk, |
| 2722 | bool UseAvailableExternallyLinkage) |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2723 | { |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2724 | const CGFunctionInfo &FnInfo = CGM.getTypes().getFunctionInfo(GD); |
| 2725 | |
| 2726 | // FIXME: re-use FnInfo in this computation. |
Anders Carlsson | fe8a993 | 2011-02-06 17:15:43 +0000 | [diff] [blame] | 2727 | llvm::Constant *Entry = CGM.GetAddrOfThunk(GD, Thunk); |
Anders Carlsson | cd836f0 | 2010-03-23 17:17:29 +0000 | [diff] [blame] | 2728 | |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2729 | // Strip off a bitcast if we got one back. |
Anders Carlsson | 4a3cdf5 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2730 | if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2731 | assert(CE->getOpcode() == llvm::Instruction::BitCast); |
Anders Carlsson | 4a3cdf5 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2732 | Entry = CE->getOperand(0); |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2733 | } |
| 2734 | |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2735 | // There's already a declaration with the same name, check if it has the same |
| 2736 | // type or if we need to replace it. |
Anders Carlsson | 4a3cdf5 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2737 | if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2738 | CGM.getTypes().GetFunctionTypeForVTable(GD)) { |
Anders Carlsson | 4a3cdf5 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2739 | llvm::GlobalValue *OldThunkFn = cast<llvm::GlobalValue>(Entry); |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2740 | |
| 2741 | // If the types mismatch then we have to rewrite the definition. |
| 2742 | assert(OldThunkFn->isDeclaration() && |
| 2743 | "Shouldn't replace non-declaration"); |
| 2744 | |
| 2745 | // Remove the name from the old thunk function and get a new thunk. |
| 2746 | OldThunkFn->setName(llvm::StringRef()); |
Anders Carlsson | fe8a993 | 2011-02-06 17:15:43 +0000 | [diff] [blame] | 2747 | Entry = CGM.GetAddrOfThunk(GD, Thunk); |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2748 | |
| 2749 | // If needed, replace the old thunk with a bitcast. |
| 2750 | if (!OldThunkFn->use_empty()) { |
| 2751 | llvm::Constant *NewPtrForOldDecl = |
Anders Carlsson | 4a3cdf5 | 2010-03-24 00:35:44 +0000 | [diff] [blame] | 2752 | llvm::ConstantExpr::getBitCast(Entry, OldThunkFn->getType()); |
Anders Carlsson | 55e89f8 | 2010-03-23 18:18:41 +0000 | [diff] [blame] | 2753 | OldThunkFn->replaceAllUsesWith(NewPtrForOldDecl); |
| 2754 | } |
| 2755 | |
| 2756 | // Remove the old thunk. |
| 2757 | OldThunkFn->eraseFromParent(); |
| 2758 | } |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2759 | |
Anders Carlsson | bad991d | 2010-03-24 00:39:18 +0000 | [diff] [blame] | 2760 | llvm::Function *ThunkFn = cast<llvm::Function>(Entry); |
Anders Carlsson | 8b02183 | 2011-02-06 18:31:40 +0000 | [diff] [blame] | 2761 | |
| 2762 | if (!ThunkFn->isDeclaration()) { |
| 2763 | if (UseAvailableExternallyLinkage) { |
| 2764 | // There is already a thunk emitted for this function, do nothing. |
| 2765 | return; |
| 2766 | } |
| 2767 | |
Anders Carlsson | e866d44 | 2011-02-06 20:09:44 +0000 | [diff] [blame] | 2768 | // If a function has a body, it should have available_externally linkage. |
| 2769 | assert(ThunkFn->hasAvailableExternallyLinkage() && |
| 2770 | "Function should have available_externally linkage!"); |
| 2771 | |
| 2772 | // Change the linkage. |
| 2773 | CGM.setFunctionLinkage(cast<CXXMethodDecl>(GD.getDecl()), ThunkFn); |
| 2774 | return; |
Anders Carlsson | 8b02183 | 2011-02-06 18:31:40 +0000 | [diff] [blame] | 2775 | } |
| 2776 | |
| 2777 | // Actually generate the thunk body. |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 2778 | CodeGenFunction(CGM).GenerateThunk(ThunkFn, FnInfo, GD, Thunk); |
Anders Carlsson | 8b02183 | 2011-02-06 18:31:40 +0000 | [diff] [blame] | 2779 | |
| 2780 | if (UseAvailableExternallyLinkage) |
| 2781 | ThunkFn->setLinkage(llvm::GlobalValue::AvailableExternallyLinkage); |
| 2782 | } |
| 2783 | |
| 2784 | void CodeGenVTables::MaybeEmitThunkAvailableExternally(GlobalDecl GD, |
| 2785 | const ThunkInfo &Thunk) { |
| 2786 | // We only want to do this when building with optimizations. |
| 2787 | if (!CGM.getCodeGenOpts().OptimizationLevel) |
| 2788 | return; |
| 2789 | |
| 2790 | // We can't emit thunks for member functions with incomplete types. |
| 2791 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl()); |
| 2792 | if (CGM.getTypes().VerifyFuncTypeComplete(MD->getType().getTypePtr())) |
| 2793 | return; |
| 2794 | |
| 2795 | EmitThunk(GD, Thunk, /*UseAvailableExternallyLinkage=*/true); |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2796 | } |
| 2797 | |
Anders Carlsson | 917229c | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2798 | void CodeGenVTables::EmitThunks(GlobalDecl GD) |
| 2799 | { |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2800 | const CXXMethodDecl *MD = |
| 2801 | cast<CXXMethodDecl>(GD.getDecl())->getCanonicalDecl(); |
| 2802 | |
| 2803 | // We don't need to generate thunks for the base destructor. |
| 2804 | if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base) |
| 2805 | return; |
| 2806 | |
| 2807 | const CXXRecordDecl *RD = MD->getParent(); |
| 2808 | |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2809 | // Compute VTable related info for this class. |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 2810 | ComputeVTableRelatedInformation(RD, false); |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2811 | |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2812 | ThunksMapTy::const_iterator I = Thunks.find(MD); |
| 2813 | if (I == Thunks.end()) { |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2814 | // We did not find a thunk for this method. |
| 2815 | return; |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2816 | } |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2817 | |
Anders Carlsson | 5c5abad | 2010-03-23 16:36:50 +0000 | [diff] [blame] | 2818 | const ThunkInfoVectorTy &ThunkInfoVector = I->second; |
| 2819 | for (unsigned I = 0, E = ThunkInfoVector.size(); I != E; ++I) |
Anders Carlsson | 8b02183 | 2011-02-06 18:31:40 +0000 | [diff] [blame] | 2820 | EmitThunk(GD, ThunkInfoVector[I], /*UseAvailableExternallyLinkage=*/false); |
Anders Carlsson | 917229c | 2010-03-23 04:59:02 +0000 | [diff] [blame] | 2821 | } |
| 2822 | |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 2823 | void CodeGenVTables::ComputeVTableRelatedInformation(const CXXRecordDecl *RD, |
| 2824 | bool RequireVTable) { |
| 2825 | VTableLayoutData &Entry = VTableLayoutMap[RD]; |
Douglas Gregor | 88d292c | 2010-05-13 16:44:06 +0000 | [diff] [blame] | 2826 | |
| 2827 | // We may need to generate a definition for this vtable. |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 2828 | if (RequireVTable && !Entry.getInt()) { |
Argyrios Kyrtzidis | 0c34b13 | 2010-10-11 03:25:57 +0000 | [diff] [blame] | 2829 | if (ShouldEmitVTableInThisTU(RD)) |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 2830 | CGM.DeferredVTables.push_back(RD); |
| 2831 | |
| 2832 | Entry.setInt(true); |
| 2833 | } |
| 2834 | |
| 2835 | // Check if we've computed this information before. |
| 2836 | if (Entry.getPointer()) |
| 2837 | return; |
Douglas Gregor | 88d292c | 2010-05-13 16:44:06 +0000 | [diff] [blame] | 2838 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2839 | VTableBuilder Builder(*this, RD, 0, /*MostDerivedClassIsVirtual=*/0, RD); |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2840 | |
| 2841 | // Add the VTable layout. |
| 2842 | uint64_t NumVTableComponents = Builder.getNumVTableComponents(); |
Fariborz Jahanian | 9f9438b | 2011-01-28 23:42:29 +0000 | [diff] [blame] | 2843 | // -fapple-kext adds an extra entry at end of vtbl. |
| 2844 | bool IsAppleKext = CGM.getContext().getLangOptions().AppleKext; |
| 2845 | if (IsAppleKext) |
| 2846 | NumVTableComponents += 1; |
| 2847 | |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 2848 | uint64_t *LayoutData = new uint64_t[NumVTableComponents + 1]; |
Fariborz Jahanian | 9f9438b | 2011-01-28 23:42:29 +0000 | [diff] [blame] | 2849 | if (IsAppleKext) |
| 2850 | LayoutData[NumVTableComponents] = 0; |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 2851 | Entry.setPointer(LayoutData); |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2852 | |
| 2853 | // Store the number of components. |
| 2854 | LayoutData[0] = NumVTableComponents; |
| 2855 | |
| 2856 | // Store the components. |
| 2857 | std::copy(Builder.vtable_components_data_begin(), |
| 2858 | Builder.vtable_components_data_end(), |
| 2859 | &LayoutData[1]); |
| 2860 | |
| 2861 | // Add the known thunks. |
| 2862 | Thunks.insert(Builder.thunks_begin(), Builder.thunks_end()); |
| 2863 | |
Anders Carlsson | 9a97e2e | 2010-03-29 01:38:05 +0000 | [diff] [blame] | 2864 | // Add the thunks needed in this vtable. |
| 2865 | assert(!VTableThunksMap.count(RD) && |
| 2866 | "Thunks already exists for this vtable!"); |
| 2867 | |
| 2868 | VTableThunksTy &VTableThunks = VTableThunksMap[RD]; |
| 2869 | VTableThunks.append(Builder.vtable_thunks_begin(), |
| 2870 | Builder.vtable_thunks_end()); |
| 2871 | |
| 2872 | // Sort them. |
| 2873 | std::sort(VTableThunks.begin(), VTableThunks.end()); |
| 2874 | |
Anders Carlsson | d03325c | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 2875 | // Add the address points. |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2876 | for (VTableBuilder::AddressPointsMapTy::const_iterator I = |
Anders Carlsson | d03325c | 2010-03-25 00:51:13 +0000 | [diff] [blame] | 2877 | Builder.address_points_begin(), E = Builder.address_points_end(); |
| 2878 | I != E; ++I) { |
| 2879 | |
| 2880 | uint64_t &AddressPoint = AddressPoints[std::make_pair(RD, I->first)]; |
| 2881 | |
| 2882 | // Check if we already have the address points for this base. |
| 2883 | assert(!AddressPoint && "Address point already exists for this base!"); |
| 2884 | |
| 2885 | AddressPoint = I->second; |
| 2886 | } |
| 2887 | |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2888 | // If we don't have the vbase information for this class, insert it. |
| 2889 | // getVirtualBaseOffsetOffset will compute it separately without computing |
| 2890 | // the rest of the vtable related information. |
| 2891 | if (!RD->getNumVBases()) |
| 2892 | return; |
| 2893 | |
| 2894 | const RecordType *VBaseRT = |
| 2895 | RD->vbases_begin()->getType()->getAs<RecordType>(); |
| 2896 | const CXXRecordDecl *VBase = cast<CXXRecordDecl>(VBaseRT->getDecl()); |
| 2897 | |
| 2898 | if (VirtualBaseClassOffsetOffsets.count(std::make_pair(RD, VBase))) |
| 2899 | return; |
| 2900 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2901 | for (VTableBuilder::VBaseOffsetOffsetsMapTy::const_iterator I = |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 2902 | Builder.getVBaseOffsetOffsets().begin(), |
| 2903 | E = Builder.getVBaseOffsetOffsets().end(); I != E; ++I) { |
| 2904 | // Insert all types. |
| 2905 | ClassPairTy ClassPair(RD, I->first); |
| 2906 | |
| 2907 | VirtualBaseClassOffsetOffsets.insert(std::make_pair(ClassPair, I->second)); |
| 2908 | } |
| 2909 | } |
| 2910 | |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2911 | llvm::Constant * |
| 2912 | CodeGenVTables::CreateVTableInitializer(const CXXRecordDecl *RD, |
| 2913 | const uint64_t *Components, |
| 2914 | unsigned NumComponents, |
| 2915 | const VTableThunksTy &VTableThunks) { |
| 2916 | llvm::SmallVector<llvm::Constant *, 64> Inits; |
| 2917 | |
| 2918 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
| 2919 | |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2920 | const llvm::Type *PtrDiffTy = |
| 2921 | CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType()); |
| 2922 | |
| 2923 | QualType ClassType = CGM.getContext().getTagDeclType(RD); |
| 2924 | llvm::Constant *RTTI = CGM.GetAddrOfRTTIDescriptor(ClassType); |
| 2925 | |
| 2926 | unsigned NextVTableThunkIndex = 0; |
| 2927 | |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2928 | llvm::Constant* PureVirtualFn = 0; |
| 2929 | |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 2930 | for (unsigned I = 0; I != NumComponents; ++I) { |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2931 | VTableComponent Component = |
| 2932 | VTableComponent::getFromOpaqueInteger(Components[I]); |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2933 | |
| 2934 | llvm::Constant *Init = 0; |
| 2935 | |
| 2936 | switch (Component.getKind()) { |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2937 | case VTableComponent::CK_VCallOffset: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2938 | Init = llvm::ConstantInt::get(PtrDiffTy, Component.getVCallOffset()); |
| 2939 | Init = llvm::ConstantExpr::getIntToPtr(Init, Int8PtrTy); |
| 2940 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2941 | case VTableComponent::CK_VBaseOffset: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2942 | Init = llvm::ConstantInt::get(PtrDiffTy, Component.getVBaseOffset()); |
| 2943 | Init = llvm::ConstantExpr::getIntToPtr(Init, Int8PtrTy); |
| 2944 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2945 | case VTableComponent::CK_OffsetToTop: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2946 | Init = llvm::ConstantInt::get(PtrDiffTy, Component.getOffsetToTop()); |
| 2947 | Init = llvm::ConstantExpr::getIntToPtr(Init, Int8PtrTy); |
| 2948 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2949 | case VTableComponent::CK_RTTI: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2950 | Init = llvm::ConstantExpr::getBitCast(RTTI, Int8PtrTy); |
| 2951 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2952 | case VTableComponent::CK_FunctionPointer: |
| 2953 | case VTableComponent::CK_CompleteDtorPointer: |
| 2954 | case VTableComponent::CK_DeletingDtorPointer: { |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2955 | GlobalDecl GD; |
| 2956 | |
| 2957 | // Get the right global decl. |
| 2958 | switch (Component.getKind()) { |
| 2959 | default: |
| 2960 | llvm_unreachable("Unexpected vtable component kind"); |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2961 | case VTableComponent::CK_FunctionPointer: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2962 | GD = Component.getFunctionDecl(); |
| 2963 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2964 | case VTableComponent::CK_CompleteDtorPointer: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2965 | GD = GlobalDecl(Component.getDestructorDecl(), Dtor_Complete); |
| 2966 | break; |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 2967 | case VTableComponent::CK_DeletingDtorPointer: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2968 | GD = GlobalDecl(Component.getDestructorDecl(), Dtor_Deleting); |
| 2969 | break; |
| 2970 | } |
| 2971 | |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2972 | if (cast<CXXMethodDecl>(GD.getDecl())->isPure()) { |
| 2973 | // We have a pure virtual member function. |
| 2974 | if (!PureVirtualFn) { |
| 2975 | const llvm::FunctionType *Ty = |
| 2976 | llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()), |
| 2977 | /*isVarArg=*/false); |
| 2978 | PureVirtualFn = |
| 2979 | CGM.CreateRuntimeFunction(Ty, "__cxa_pure_virtual"); |
| 2980 | PureVirtualFn = llvm::ConstantExpr::getBitCast(PureVirtualFn, |
| 2981 | Int8PtrTy); |
| 2982 | } |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2983 | |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2984 | Init = PureVirtualFn; |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2985 | } else { |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2986 | // Check if we should use a thunk. |
| 2987 | if (NextVTableThunkIndex < VTableThunks.size() && |
| 2988 | VTableThunks[NextVTableThunkIndex].first == I) { |
| 2989 | const ThunkInfo &Thunk = VTableThunks[NextVTableThunkIndex].second; |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 2990 | |
Anders Carlsson | fe8a993 | 2011-02-06 17:15:43 +0000 | [diff] [blame] | 2991 | Init = CGM.GetAddrOfThunk(GD, Thunk); |
Anders Carlsson | 8b02183 | 2011-02-06 18:31:40 +0000 | [diff] [blame] | 2992 | MaybeEmitThunkAvailableExternally(GD, Thunk); |
| 2993 | |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2994 | NextVTableThunkIndex++; |
| 2995 | } else { |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 2996 | const llvm::Type *Ty = CGM.getTypes().GetFunctionTypeForVTable(GD); |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2997 | |
Anders Carlsson | 3c23948 | 2011-02-05 04:35:53 +0000 | [diff] [blame] | 2998 | Init = CGM.GetAddrOfFunction(GD, Ty, /*ForVTable=*/true); |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 2999 | } |
| 3000 | |
| 3001 | Init = llvm::ConstantExpr::getBitCast(Init, Int8PtrTy); |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3002 | } |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3003 | break; |
| 3004 | } |
| 3005 | |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 3006 | case VTableComponent::CK_UnusedFunctionPointer: |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3007 | Init = llvm::ConstantExpr::getNullValue(Int8PtrTy); |
| 3008 | break; |
| 3009 | }; |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3010 | |
| 3011 | Inits.push_back(Init); |
| 3012 | } |
| 3013 | |
| 3014 | llvm::ArrayType *ArrayType = llvm::ArrayType::get(Int8PtrTy, NumComponents); |
| 3015 | return llvm::ConstantArray::get(ArrayType, Inits.data(), Inits.size()); |
| 3016 | } |
| 3017 | |
Anders Carlsson | a086edc | 2010-03-30 03:35:35 +0000 | [diff] [blame] | 3018 | llvm::GlobalVariable *CodeGenVTables::GetAddrOfVTable(const CXXRecordDecl *RD) { |
Anders Carlsson | b35ea55 | 2010-03-24 03:57:14 +0000 | [diff] [blame] | 3019 | llvm::SmallString<256> OutName; |
Rafael Espindola | 3968cd0 | 2011-02-11 02:52:17 +0000 | [diff] [blame] | 3020 | llvm::raw_svector_ostream Out(OutName); |
| 3021 | CGM.getCXXABI().getMangleContext().mangleCXXVTable(RD, Out); |
| 3022 | Out.flush(); |
Anders Carlsson | b35ea55 | 2010-03-24 03:57:14 +0000 | [diff] [blame] | 3023 | llvm::StringRef Name = OutName.str(); |
Mike Stump | aa51ad6 | 2009-11-19 04:04:36 +0000 | [diff] [blame] | 3024 | |
John McCall | 6a7f9f5 | 2010-06-02 21:22:02 +0000 | [diff] [blame] | 3025 | ComputeVTableRelatedInformation(RD, true); |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 3026 | |
Anders Carlsson | b35ea55 | 2010-03-24 03:57:14 +0000 | [diff] [blame] | 3027 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
Anders Carlsson | e90954d | 2010-03-24 16:42:11 +0000 | [diff] [blame] | 3028 | llvm::ArrayType *ArrayType = |
| 3029 | llvm::ArrayType::get(Int8PtrTy, getNumVTableComponents(RD)); |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3030 | |
Rafael Espindola | 5674c64 | 2011-01-11 21:10:26 +0000 | [diff] [blame] | 3031 | llvm::GlobalVariable *GV = |
Anders Carlsson | 93be9a9 | 2011-01-29 18:25:07 +0000 | [diff] [blame] | 3032 | CGM.CreateOrReplaceCXXRuntimeVariable(Name, ArrayType, |
| 3033 | llvm::GlobalValue::ExternalLinkage); |
Rafael Espindola | facb7d0 | 2011-01-15 08:23:14 +0000 | [diff] [blame] | 3034 | GV->setUnnamedAddr(true); |
Rafael Espindola | 5674c64 | 2011-01-11 21:10:26 +0000 | [diff] [blame] | 3035 | return GV; |
Mike Stump | d846d08 | 2009-11-10 07:44:33 +0000 | [diff] [blame] | 3036 | } |
Mike Stump | eac4559 | 2009-11-11 20:26:26 +0000 | [diff] [blame] | 3037 | |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3038 | void |
| 3039 | CodeGenVTables::EmitVTableDefinition(llvm::GlobalVariable *VTable, |
| 3040 | llvm::GlobalVariable::LinkageTypes Linkage, |
| 3041 | const CXXRecordDecl *RD) { |
| 3042 | // Dump the vtable layout if necessary. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3043 | if (CGM.getLangOptions().DumpVTableLayouts) { |
Anders Carlsson | be1b9cb | 2010-04-10 19:13:06 +0000 | [diff] [blame] | 3044 | VTableBuilder Builder(*this, RD, 0, /*MostDerivedClassIsVirtual=*/0, RD); |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3045 | |
| 3046 | Builder.dumpLayout(llvm::errs()); |
| 3047 | } |
| 3048 | |
| 3049 | assert(VTableThunksMap.count(RD) && |
| 3050 | "No thunk status for this record decl!"); |
| 3051 | |
| 3052 | const VTableThunksTy& Thunks = VTableThunksMap[RD]; |
| 3053 | |
| 3054 | // Create and set the initializer. |
| 3055 | llvm::Constant *Init = |
| 3056 | CreateVTableInitializer(RD, getVTableComponentsData(RD), |
| 3057 | getNumVTableComponents(RD), Thunks); |
| 3058 | VTable->setInitializer(Init); |
Anders Carlsson | cb6207f | 2010-03-29 05:40:50 +0000 | [diff] [blame] | 3059 | |
| 3060 | // Set the correct linkage. |
| 3061 | VTable->setLinkage(Linkage); |
Douglas Gregor | 4f6e8de | 2010-06-14 23:41:45 +0000 | [diff] [blame] | 3062 | |
| 3063 | // Set the right visibility. |
Anders Carlsson | 265aa7c | 2011-01-29 20:24:48 +0000 | [diff] [blame] | 3064 | CGM.setTypeVisibility(VTable, RD, CodeGenModule::TVK_ForVTable); |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3065 | } |
| 3066 | |
Anders Carlsson | 0534b02 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 3067 | llvm::GlobalVariable * |
| 3068 | CodeGenVTables::GenerateConstructionVTable(const CXXRecordDecl *RD, |
Anders Carlsson | a208b39 | 2010-03-26 03:56:54 +0000 | [diff] [blame] | 3069 | const BaseSubobject &Base, |
| 3070 | bool BaseIsVirtual, |
John McCall | 358d056 | 2011-03-27 09:00:25 +0000 | [diff] [blame] | 3071 | llvm::GlobalVariable::LinkageTypes Linkage, |
Anders Carlsson | a208b39 | 2010-03-26 03:56:54 +0000 | [diff] [blame] | 3072 | VTableAddressPointsMapTy& AddressPoints) { |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 3073 | VTableBuilder Builder(*this, Base.getBase(), |
| 3074 | CGM.getContext().toBits(Base.getBaseOffset()), |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3075 | /*MostDerivedClassIsVirtual=*/BaseIsVirtual, RD); |
| 3076 | |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3077 | // Dump the vtable layout if necessary. |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3078 | if (CGM.getLangOptions().DumpVTableLayouts) |
Anders Carlsson | a5736bd | 2010-03-25 16:49:53 +0000 | [diff] [blame] | 3079 | Builder.dumpLayout(llvm::errs()); |
| 3080 | |
| 3081 | // Add the address points. |
Anders Carlsson | a208b39 | 2010-03-26 03:56:54 +0000 | [diff] [blame] | 3082 | AddressPoints.insert(Builder.address_points_begin(), |
| 3083 | Builder.address_points_end()); |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3084 | |
| 3085 | // Get the mangled construction vtable name. |
| 3086 | llvm::SmallString<256> OutName; |
Rafael Espindola | 3968cd0 | 2011-02-11 02:52:17 +0000 | [diff] [blame] | 3087 | llvm::raw_svector_ostream Out(OutName); |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 3088 | CGM.getCXXABI().getMangleContext(). |
Ken Dyck | 16ffcac | 2011-03-24 01:21:01 +0000 | [diff] [blame] | 3089 | mangleCXXCtorVTable(RD, Base.getBaseOffset().getQuantity(), Base.getBase(), |
| 3090 | Out); |
Rafael Espindola | 3968cd0 | 2011-02-11 02:52:17 +0000 | [diff] [blame] | 3091 | Out.flush(); |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3092 | llvm::StringRef Name = OutName.str(); |
| 3093 | |
| 3094 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
| 3095 | llvm::ArrayType *ArrayType = |
| 3096 | llvm::ArrayType::get(Int8PtrTy, Builder.getNumVTableComponents()); |
| 3097 | |
| 3098 | // Create the variable that will hold the construction vtable. |
| 3099 | llvm::GlobalVariable *VTable = |
John McCall | 358d056 | 2011-03-27 09:00:25 +0000 | [diff] [blame] | 3100 | CGM.CreateOrReplaceCXXRuntimeVariable(Name, ArrayType, Linkage); |
| 3101 | CGM.setTypeVisibility(VTable, RD, CodeGenModule::TVK_ForConstructionVTable); |
| 3102 | |
| 3103 | // V-tables are always unnamed_addr. |
| 3104 | VTable->setUnnamedAddr(true); |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3105 | |
| 3106 | // Add the thunks. |
| 3107 | VTableThunksTy VTableThunks; |
| 3108 | VTableThunks.append(Builder.vtable_thunks_begin(), |
| 3109 | Builder.vtable_thunks_end()); |
| 3110 | |
Anders Carlsson | 848d86e | 2010-03-29 01:28:05 +0000 | [diff] [blame] | 3111 | // Sort them. |
| 3112 | std::sort(VTableThunks.begin(), VTableThunks.end()); |
| 3113 | |
Anders Carlsson | a414714 | 2010-03-25 15:26:28 +0000 | [diff] [blame] | 3114 | // Create and set the initializer. |
| 3115 | llvm::Constant *Init = |
| 3116 | CreateVTableInitializer(Base.getBase(), |
| 3117 | Builder.vtable_components_data_begin(), |
| 3118 | Builder.getNumVTableComponents(), VTableThunks); |
| 3119 | VTable->setInitializer(Init); |
| 3120 | |
Anders Carlsson | 0534b02 | 2010-03-25 00:35:49 +0000 | [diff] [blame] | 3121 | return VTable; |
| 3122 | } |
| 3123 | |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3124 | void |
| 3125 | CodeGenVTables::GenerateClassData(llvm::GlobalVariable::LinkageTypes Linkage, |
| 3126 | const CXXRecordDecl *RD) { |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3127 | llvm::GlobalVariable *&VTable = VTables[RD]; |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3128 | if (VTable) { |
Anders Carlsson | 11e5140 | 2010-04-17 20:15:18 +0000 | [diff] [blame] | 3129 | assert(VTable->getInitializer() && "VTable doesn't have a definition!"); |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3130 | return; |
| 3131 | } |
| 3132 | |
Anders Carlsson | a086edc | 2010-03-30 03:35:35 +0000 | [diff] [blame] | 3133 | VTable = GetAddrOfVTable(RD); |
| 3134 | EmitVTableDefinition(VTable, Linkage, RD); |
| 3135 | |
Anders Carlsson | 883fc72 | 2011-01-29 19:16:51 +0000 | [diff] [blame] | 3136 | if (RD->getNumVBases()) { |
| 3137 | llvm::GlobalVariable *VTT = GetAddrOfVTT(RD); |
| 3138 | EmitVTTDefinition(VTT, Linkage, RD); |
| 3139 | } |
Douglas Gregor | eadd3ca | 2010-04-08 15:52:03 +0000 | [diff] [blame] | 3140 | |
| 3141 | // If this is the magic class __cxxabiv1::__fundamental_type_info, |
| 3142 | // we will emit the typeinfo for the fundamental types. This is the |
| 3143 | // same behaviour as GCC. |
| 3144 | const DeclContext *DC = RD->getDeclContext(); |
| 3145 | if (RD->getIdentifier() && |
| 3146 | RD->getIdentifier()->isStr("__fundamental_type_info") && |
| 3147 | isa<NamespaceDecl>(DC) && |
| 3148 | cast<NamespaceDecl>(DC)->getIdentifier() && |
| 3149 | cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__cxxabiv1") && |
| 3150 | DC->getParent()->isTranslationUnit()) |
| 3151 | CGM.EmitFundamentalRTTIDescriptors(); |
Anders Carlsson | a627ac7e | 2010-03-29 03:38:52 +0000 | [diff] [blame] | 3152 | } |