Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 1 | //===--- CGRecordLayoutBuilder.cpp - CGRecordLayout builder ----*- C++ -*-===// |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +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 | // |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 10 | // Builder implementation for CGRecordLayout objects. |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
Daniel Dunbar | 2924ade | 2010-03-30 22:26:10 +0000 | [diff] [blame] | 14 | #include "CGRecordLayout.h" |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 15 | #include "clang/AST/ASTContext.h" |
| 16 | #include "clang/AST/Attr.h" |
| 17 | #include "clang/AST/DeclCXX.h" |
| 18 | #include "clang/AST/Expr.h" |
| 19 | #include "clang/AST/RecordLayout.h" |
| 20 | #include "CodeGenTypes.h" |
| 21 | #include "llvm/DerivedTypes.h" |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 22 | #include "llvm/Type.h" |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 23 | #include "llvm/Support/Debug.h" |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 24 | #include "llvm/Support/raw_ostream.h" |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 25 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 26 | using namespace clang; |
| 27 | using namespace CodeGen; |
| 28 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 29 | namespace clang { |
| 30 | namespace CodeGen { |
| 31 | |
| 32 | class CGRecordLayoutBuilder { |
| 33 | public: |
| 34 | /// FieldTypes - Holds the LLVM types that the struct is created from. |
| 35 | std::vector<const llvm::Type *> FieldTypes; |
| 36 | |
| 37 | /// LLVMFieldInfo - Holds a field and its corresponding LLVM field number. |
| 38 | typedef std::pair<const FieldDecl *, unsigned> LLVMFieldInfo; |
| 39 | llvm::SmallVector<LLVMFieldInfo, 16> LLVMFields; |
| 40 | |
| 41 | /// LLVMBitFieldInfo - Holds location and size information about a bit field. |
Daniel Dunbar | c7a984a | 2010-04-06 01:07:41 +0000 | [diff] [blame] | 42 | typedef std::pair<const FieldDecl *, CGBitFieldInfo> LLVMBitFieldInfo; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 43 | llvm::SmallVector<LLVMBitFieldInfo, 16> LLVMBitFields; |
| 44 | |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 45 | typedef std::pair<const CXXRecordDecl *, unsigned> LLVMBaseInfo; |
| 46 | llvm::SmallVector<LLVMBaseInfo, 16> LLVMNonVirtualBases; |
| 47 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 48 | /// ContainsPointerToDataMember - Whether one of the fields in this record |
| 49 | /// layout is a pointer to data member, or a struct that contains pointer to |
| 50 | /// data member. |
| 51 | bool ContainsPointerToDataMember; |
| 52 | |
| 53 | /// Packed - Whether the resulting LLVM struct will be packed or not. |
| 54 | bool Packed; |
| 55 | |
| 56 | private: |
| 57 | CodeGenTypes &Types; |
| 58 | |
| 59 | /// Alignment - Contains the alignment of the RecordDecl. |
| 60 | // |
| 61 | // FIXME: This is not needed and should be removed. |
| 62 | unsigned Alignment; |
| 63 | |
| 64 | /// AlignmentAsLLVMStruct - Will contain the maximum alignment of all the |
| 65 | /// LLVM types. |
| 66 | unsigned AlignmentAsLLVMStruct; |
| 67 | |
| 68 | /// BitsAvailableInLastField - If a bit field spans only part of a LLVM field, |
| 69 | /// this will have the number of bits still available in the field. |
| 70 | char BitsAvailableInLastField; |
| 71 | |
| 72 | /// NextFieldOffsetInBytes - Holds the next field offset in bytes. |
| 73 | uint64_t NextFieldOffsetInBytes; |
| 74 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 75 | /// LayoutUnionField - Will layout a field in an union and return the type |
| 76 | /// that the field will have. |
| 77 | const llvm::Type *LayoutUnionField(const FieldDecl *Field, |
| 78 | const ASTRecordLayout &Layout); |
| 79 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 80 | /// LayoutUnion - Will layout a union RecordDecl. |
| 81 | void LayoutUnion(const RecordDecl *D); |
| 82 | |
| 83 | /// LayoutField - try to layout all fields in the record decl. |
| 84 | /// Returns false if the operation failed because the struct is not packed. |
| 85 | bool LayoutFields(const RecordDecl *D); |
| 86 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 87 | /// LayoutNonVirtualBase - layout a single non-virtual base. |
| 88 | void LayoutNonVirtualBase(const CXXRecordDecl *BaseDecl, |
| 89 | uint64_t BaseOffset); |
| 90 | |
| 91 | /// LayoutNonVirtualBases - layout the non-virtual bases of a record decl. |
| 92 | void LayoutNonVirtualBases(const CXXRecordDecl *RD, |
| 93 | const ASTRecordLayout &Layout); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 94 | |
| 95 | /// LayoutField - layout a single field. Returns false if the operation failed |
| 96 | /// because the current struct is not packed. |
| 97 | bool LayoutField(const FieldDecl *D, uint64_t FieldOffset); |
| 98 | |
| 99 | /// LayoutBitField - layout a single bit field. |
| 100 | void LayoutBitField(const FieldDecl *D, uint64_t FieldOffset); |
| 101 | |
| 102 | /// AppendField - Appends a field with the given offset and type. |
| 103 | void AppendField(uint64_t FieldOffsetInBytes, const llvm::Type *FieldTy); |
| 104 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 105 | /// AppendPadding - Appends enough padding bytes so that the total |
| 106 | /// struct size is a multiple of the field alignment. |
| 107 | void AppendPadding(uint64_t FieldOffsetInBytes, unsigned FieldAlignment); |
| 108 | |
| 109 | /// AppendBytes - Append a given number of bytes to the record. |
| 110 | void AppendBytes(uint64_t NumBytes); |
| 111 | |
| 112 | /// AppendTailPadding - Append enough tail padding so that the type will have |
| 113 | /// the passed size. |
| 114 | void AppendTailPadding(uint64_t RecordSize); |
| 115 | |
| 116 | unsigned getTypeAlignment(const llvm::Type *Ty) const; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 117 | |
| 118 | /// CheckForPointerToDataMember - Check if the given type contains a pointer |
| 119 | /// to data member. |
| 120 | void CheckForPointerToDataMember(QualType T); |
| 121 | |
| 122 | public: |
| 123 | CGRecordLayoutBuilder(CodeGenTypes &Types) |
| 124 | : ContainsPointerToDataMember(false), Packed(false), Types(Types), |
| 125 | Alignment(0), AlignmentAsLLVMStruct(1), |
| 126 | BitsAvailableInLastField(0), NextFieldOffsetInBytes(0) { } |
| 127 | |
| 128 | /// Layout - Will layout a RecordDecl. |
| 129 | void Layout(const RecordDecl *D); |
| 130 | }; |
| 131 | |
| 132 | } |
| 133 | } |
| 134 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 135 | void CGRecordLayoutBuilder::Layout(const RecordDecl *D) { |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 136 | Alignment = Types.getContext().getASTRecordLayout(D).getAlignment() / 8; |
Anders Carlsson | d0eb3b9 | 2009-09-02 17:51:33 +0000 | [diff] [blame] | 137 | Packed = D->hasAttr<PackedAttr>(); |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 138 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 139 | if (D->isUnion()) { |
| 140 | LayoutUnion(D); |
| 141 | return; |
| 142 | } |
Anders Carlsson | a860e75 | 2009-08-08 18:23:56 +0000 | [diff] [blame] | 143 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 144 | if (LayoutFields(D)) |
| 145 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 146 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 147 | // We weren't able to layout the struct. Try again with a packed struct |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 148 | Packed = true; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 149 | AlignmentAsLLVMStruct = 1; |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 150 | NextFieldOffsetInBytes = 0; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 151 | FieldTypes.clear(); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 152 | LLVMFields.clear(); |
| 153 | LLVMBitFields.clear(); |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 154 | LLVMNonVirtualBases.clear(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 155 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 156 | LayoutFields(D); |
| 157 | } |
| 158 | |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 159 | static CGBitFieldInfo ComputeBitFieldInfo(CodeGenTypes &Types, |
| 160 | const FieldDecl *FD, |
| 161 | uint64_t FieldOffset, |
| 162 | uint64_t FieldSize) { |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 163 | const RecordDecl *RD = FD->getParent(); |
Daniel Dunbar | 89da874 | 2010-04-22 03:17:04 +0000 | [diff] [blame] | 164 | const ASTRecordLayout &RL = Types.getContext().getASTRecordLayout(RD); |
| 165 | uint64_t ContainingTypeSizeInBits = RL.getSize(); |
| 166 | unsigned ContainingTypeAlign = RL.getAlignment(); |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 167 | |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 168 | const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(FD->getType()); |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 169 | uint64_t TypeSizeInBytes = Types.getTargetData().getTypeAllocSize(Ty); |
| 170 | uint64_t TypeSizeInBits = TypeSizeInBytes * 8; |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 171 | |
| 172 | bool IsSigned = FD->getType()->isSignedIntegerType(); |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 173 | |
Anders Carlsson | 1c7658f | 2010-04-16 16:23:02 +0000 | [diff] [blame] | 174 | if (FieldSize > TypeSizeInBits) { |
Anders Carlsson | 6ba3815 | 2010-04-17 22:54:57 +0000 | [diff] [blame] | 175 | // We have a wide bit-field. The extra bits are only used for padding, so |
| 176 | // if we have a bitfield of type T, with size N: |
| 177 | // |
| 178 | // T t : N; |
| 179 | // |
| 180 | // We can just assume that it's: |
| 181 | // |
| 182 | // T t : sizeof(T); |
| 183 | // |
| 184 | FieldSize = TypeSizeInBits; |
Anders Carlsson | 1c7658f | 2010-04-16 16:23:02 +0000 | [diff] [blame] | 185 | } |
| 186 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 187 | // Compute the access components. The policy we use is to start by attempting |
| 188 | // to access using the width of the bit-field type itself and to always access |
| 189 | // at aligned indices of that type. If such an access would fail because it |
| 190 | // extends past the bound of the type, then we reduce size to the next smaller |
| 191 | // power of two and retry. The current algorithm assumes pow2 sized types, |
| 192 | // although this is easy to fix. |
| 193 | // |
| 194 | // FIXME: This algorithm is wrong on big-endian systems, I think. |
| 195 | assert(llvm::isPowerOf2_32(TypeSizeInBits) && "Unexpected type size!"); |
| 196 | CGBitFieldInfo::AccessInfo Components[3]; |
| 197 | unsigned NumComponents = 0; |
| 198 | unsigned AccessedTargetBits = 0; // The tumber of target bits accessed. |
| 199 | unsigned AccessWidth = TypeSizeInBits; // The current access width to attempt. |
Anders Carlsson | 1c7658f | 2010-04-16 16:23:02 +0000 | [diff] [blame] | 200 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 201 | // Round down from the field offset to find the first access position that is |
| 202 | // at an aligned offset of the initial access type. |
Daniel Dunbar | 52968a1 | 2010-04-22 15:22:33 +0000 | [diff] [blame] | 203 | uint64_t AccessStart = FieldOffset - (FieldOffset % AccessWidth); |
| 204 | |
| 205 | // Adjust initial access size to fit within record. |
| 206 | while (AccessWidth > 8 && |
| 207 | AccessStart + AccessWidth > ContainingTypeSizeInBits) { |
| 208 | AccessWidth >>= 1; |
| 209 | AccessStart = FieldOffset - (FieldOffset % AccessWidth); |
| 210 | } |
Daniel Dunbar | 2df2569 | 2010-04-15 05:09:32 +0000 | [diff] [blame] | 211 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 212 | while (AccessedTargetBits < FieldSize) { |
| 213 | // Check that we can access using a type of this size, without reading off |
| 214 | // the end of the structure. This can occur with packed structures and |
| 215 | // -fno-bitfield-type-align, for example. |
| 216 | if (AccessStart + AccessWidth > ContainingTypeSizeInBits) { |
| 217 | // If so, reduce access size to the next smaller power-of-two and retry. |
| 218 | AccessWidth >>= 1; |
| 219 | assert(AccessWidth >= 8 && "Cannot access under byte size!"); |
| 220 | continue; |
| 221 | } |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 222 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 223 | // Otherwise, add an access component. |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 224 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 225 | // First, compute the bits inside this access which are part of the |
| 226 | // target. We are reading bits [AccessStart, AccessStart + AccessWidth); the |
| 227 | // intersection with [FieldOffset, FieldOffset + FieldSize) gives the bits |
| 228 | // in the target that we are reading. |
Daniel Dunbar | 52968a1 | 2010-04-22 15:22:33 +0000 | [diff] [blame] | 229 | assert(FieldOffset < AccessStart + AccessWidth && "Invalid access start!"); |
| 230 | assert(AccessStart < FieldOffset + FieldSize && "Invalid access start!"); |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 231 | uint64_t AccessBitsInFieldStart = std::max(AccessStart, FieldOffset); |
| 232 | uint64_t AccessBitsInFieldSize = |
Daniel Dunbar | 52968a1 | 2010-04-22 15:22:33 +0000 | [diff] [blame] | 233 | std::min(AccessWidth + AccessStart, |
| 234 | FieldOffset + FieldSize) - AccessBitsInFieldStart; |
Daniel Dunbar | 4651efb | 2010-04-22 14:56:10 +0000 | [diff] [blame] | 235 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 236 | assert(NumComponents < 3 && "Unexpected number of components!"); |
| 237 | CGBitFieldInfo::AccessInfo &AI = Components[NumComponents++]; |
| 238 | AI.FieldIndex = 0; |
| 239 | // FIXME: We still follow the old access pattern of only using the field |
| 240 | // byte offset. We should switch this once we fix the struct layout to be |
| 241 | // pretty. |
| 242 | AI.FieldByteOffset = AccessStart / 8; |
| 243 | AI.FieldBitStart = AccessBitsInFieldStart - AccessStart; |
| 244 | AI.AccessWidth = AccessWidth; |
Daniel Dunbar | 89da874 | 2010-04-22 03:17:04 +0000 | [diff] [blame] | 245 | AI.AccessAlignment = llvm::MinAlign(ContainingTypeAlign, AccessStart) / 8; |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 246 | AI.TargetBitOffset = AccessedTargetBits; |
| 247 | AI.TargetBitWidth = AccessBitsInFieldSize; |
| 248 | |
| 249 | AccessStart += AccessWidth; |
| 250 | AccessedTargetBits += AI.TargetBitWidth; |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 251 | } |
| 252 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 253 | assert(AccessedTargetBits == FieldSize && "Invalid bit-field access!"); |
Daniel Dunbar | 2df2569 | 2010-04-15 05:09:32 +0000 | [diff] [blame] | 254 | return CGBitFieldInfo(FieldSize, NumComponents, Components, IsSigned); |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 255 | } |
| 256 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 257 | void CGRecordLayoutBuilder::LayoutBitField(const FieldDecl *D, |
| 258 | uint64_t FieldOffset) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 259 | uint64_t FieldSize = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 260 | D->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 261 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 262 | if (FieldSize == 0) |
| 263 | return; |
| 264 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 265 | uint64_t NextFieldOffset = NextFieldOffsetInBytes * 8; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 266 | unsigned NumBytesToAppend; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 267 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 268 | if (FieldOffset < NextFieldOffset) { |
| 269 | assert(BitsAvailableInLastField && "Bitfield size mismatch!"); |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 270 | assert(NextFieldOffsetInBytes && "Must have laid out at least one byte!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 271 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 272 | // The bitfield begins in the previous bit-field. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 273 | NumBytesToAppend = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 274 | llvm::RoundUpToAlignment(FieldSize - BitsAvailableInLastField, 8) / 8; |
| 275 | } else { |
| 276 | assert(FieldOffset % 8 == 0 && "Field offset not aligned correctly"); |
| 277 | |
| 278 | // Append padding if necessary. |
| 279 | AppendBytes((FieldOffset - NextFieldOffset) / 8); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 280 | |
| 281 | NumBytesToAppend = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 282 | llvm::RoundUpToAlignment(FieldSize, 8) / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 283 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 284 | assert(NumBytesToAppend && "No bytes to append!"); |
| 285 | } |
| 286 | |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 287 | // Add the bit field info. |
| 288 | LLVMBitFields.push_back( |
| 289 | LLVMBitFieldInfo(D, ComputeBitFieldInfo(Types, D, FieldOffset, FieldSize))); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 290 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 291 | AppendBytes(NumBytesToAppend); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 292 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 293 | BitsAvailableInLastField = |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 294 | NextFieldOffsetInBytes * 8 - (FieldOffset + FieldSize); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D, |
| 298 | uint64_t FieldOffset) { |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 299 | // If the field is packed, then we need a packed struct. |
Anders Carlsson | a860e75 | 2009-08-08 18:23:56 +0000 | [diff] [blame] | 300 | if (!Packed && D->hasAttr<PackedAttr>()) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 301 | return false; |
| 302 | |
| 303 | if (D->isBitField()) { |
| 304 | // We must use packed structs for unnamed bit fields since they |
| 305 | // don't affect the struct alignment. |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 306 | if (!Packed && !D->getDeclName()) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 307 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 308 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 309 | LayoutBitField(D, FieldOffset); |
| 310 | return true; |
| 311 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 312 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 313 | // Check if we have a pointer to data member in this field. |
| 314 | CheckForPointerToDataMember(D->getType()); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 315 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 316 | assert(FieldOffset % 8 == 0 && "FieldOffset is not on a byte boundary!"); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 317 | uint64_t FieldOffsetInBytes = FieldOffset / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 318 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 319 | const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(D->getType()); |
| 320 | unsigned TypeAlignment = getTypeAlignment(Ty); |
| 321 | |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 322 | // If the type alignment is larger then the struct alignment, we must use |
| 323 | // a packed struct. |
| 324 | if (TypeAlignment > Alignment) { |
| 325 | assert(!Packed && "Alignment is wrong even with packed struct!"); |
| 326 | return false; |
| 327 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 328 | |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 329 | if (const RecordType *RT = D->getType()->getAs<RecordType>()) { |
| 330 | const RecordDecl *RD = cast<RecordDecl>(RT->getDecl()); |
| 331 | if (const PragmaPackAttr *PPA = RD->getAttr<PragmaPackAttr>()) { |
| 332 | if (PPA->getAlignment() != TypeAlignment * 8 && !Packed) |
| 333 | return false; |
| 334 | } |
| 335 | } |
| 336 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 337 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 338 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 339 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, TypeAlignment); |
| 340 | |
| 341 | if (FieldOffsetInBytes < AlignedNextFieldOffsetInBytes) { |
| 342 | assert(!Packed && "Could not place field even with packed struct!"); |
| 343 | return false; |
| 344 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 345 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 346 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 347 | // Even with alignment, the field offset is not at the right place, |
| 348 | // insert padding. |
| 349 | uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 350 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 351 | AppendBytes(PaddingInBytes); |
| 352 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 353 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 354 | // Now append the field. |
| 355 | LLVMFields.push_back(LLVMFieldInfo(D, FieldTypes.size())); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 356 | AppendField(FieldOffsetInBytes, Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 357 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 358 | return true; |
| 359 | } |
| 360 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 361 | const llvm::Type * |
| 362 | CGRecordLayoutBuilder::LayoutUnionField(const FieldDecl *Field, |
| 363 | const ASTRecordLayout &Layout) { |
| 364 | if (Field->isBitField()) { |
| 365 | uint64_t FieldSize = |
| 366 | Field->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue(); |
| 367 | |
| 368 | // Ignore zero sized bit fields. |
| 369 | if (FieldSize == 0) |
| 370 | return 0; |
| 371 | |
Daniel Dunbar | 8ab78a7 | 2010-04-20 17:52:30 +0000 | [diff] [blame] | 372 | const llvm::Type *FieldTy = llvm::Type::getInt8Ty(Types.getLLVMContext()); |
| 373 | unsigned NumBytesToAppend = |
| 374 | llvm::RoundUpToAlignment(FieldSize, 8) / 8; |
Anders Carlsson | d62328e | 2010-04-17 21:04:52 +0000 | [diff] [blame] | 375 | |
Daniel Dunbar | 8ab78a7 | 2010-04-20 17:52:30 +0000 | [diff] [blame] | 376 | if (NumBytesToAppend > 1) |
| 377 | FieldTy = llvm::ArrayType::get(FieldTy, NumBytesToAppend); |
Anders Carlsson | d62328e | 2010-04-17 21:04:52 +0000 | [diff] [blame] | 378 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 379 | // Add the bit field info. |
| 380 | LLVMBitFields.push_back( |
| 381 | LLVMBitFieldInfo(Field, ComputeBitFieldInfo(Types, Field, 0, FieldSize))); |
Anders Carlsson | d62328e | 2010-04-17 21:04:52 +0000 | [diff] [blame] | 382 | return FieldTy; |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 383 | } |
Daniel Dunbar | 8ab78a7 | 2010-04-20 17:52:30 +0000 | [diff] [blame] | 384 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 385 | // This is a regular union field. |
| 386 | LLVMFields.push_back(LLVMFieldInfo(Field, 0)); |
| 387 | return Types.ConvertTypeForMemRecursive(Field->getType()); |
| 388 | } |
| 389 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 390 | void CGRecordLayoutBuilder::LayoutUnion(const RecordDecl *D) { |
| 391 | assert(D->isUnion() && "Can't call LayoutUnion on a non-union record!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 392 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 393 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 394 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 395 | const llvm::Type *Ty = 0; |
| 396 | uint64_t Size = 0; |
| 397 | unsigned Align = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 398 | |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 399 | bool HasOnlyZeroSizedBitFields = true; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 400 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 401 | unsigned FieldNo = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 402 | for (RecordDecl::field_iterator Field = D->field_begin(), |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 403 | FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 404 | assert(Layout.getFieldOffset(FieldNo) == 0 && |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 405 | "Union field offset did not start at the beginning of record!"); |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 406 | const llvm::Type *FieldTy = LayoutUnionField(*Field, Layout); |
Anders Carlsson | 2cc8f17 | 2009-07-23 04:00:39 +0000 | [diff] [blame] | 407 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 408 | if (!FieldTy) |
| 409 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 410 | |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 411 | HasOnlyZeroSizedBitFields = false; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 412 | |
Anders Carlsson | 177d4d8 | 2009-07-23 21:52:03 +0000 | [diff] [blame] | 413 | unsigned FieldAlign = Types.getTargetData().getABITypeAlignment(FieldTy); |
| 414 | uint64_t FieldSize = Types.getTargetData().getTypeAllocSize(FieldTy); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 415 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 416 | if (FieldAlign < Align) |
| 417 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 418 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 419 | if (FieldAlign > Align || FieldSize > Size) { |
| 420 | Ty = FieldTy; |
| 421 | Align = FieldAlign; |
| 422 | Size = FieldSize; |
| 423 | } |
| 424 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 425 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 426 | // Now add our field. |
Anders Carlsson | 3662000 | 2009-09-03 22:56:02 +0000 | [diff] [blame] | 427 | if (Ty) { |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 428 | AppendField(0, Ty); |
Anders Carlsson | 3662000 | 2009-09-03 22:56:02 +0000 | [diff] [blame] | 429 | |
| 430 | if (getTypeAlignment(Ty) > Layout.getAlignment() / 8) { |
| 431 | // We need a packed struct. |
| 432 | Packed = true; |
| 433 | Align = 1; |
| 434 | } |
| 435 | } |
Fariborz Jahanian | e504170 | 2009-11-06 20:47:40 +0000 | [diff] [blame] | 436 | if (!Align) { |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 437 | assert(HasOnlyZeroSizedBitFields && |
| 438 | "0-align record did not have all zero-sized bit-fields!"); |
Fariborz Jahanian | e504170 | 2009-11-06 20:47:40 +0000 | [diff] [blame] | 439 | Align = 1; |
| 440 | } |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 441 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 442 | // Append tail padding. |
| 443 | if (Layout.getSize() / 8 > Size) |
| 444 | AppendPadding(Layout.getSize() / 8, Align); |
| 445 | } |
| 446 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 447 | void CGRecordLayoutBuilder::LayoutNonVirtualBase(const CXXRecordDecl *BaseDecl, |
| 448 | uint64_t BaseOffset) { |
| 449 | const ASTRecordLayout &Layout = |
| 450 | Types.getContext().getASTRecordLayout(BaseDecl); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 451 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 452 | uint64_t NonVirtualSize = Layout.getNonVirtualSize(); |
| 453 | |
| 454 | if (BaseDecl->isEmpty()) { |
| 455 | // FIXME: Lay out empty bases. |
| 456 | return; |
| 457 | } |
| 458 | |
| 459 | // FIXME: Actually use a better type than [sizeof(BaseDecl) x i8] when we can. |
| 460 | AppendPadding(BaseOffset / 8, 1); |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 461 | |
| 462 | // Append the base field. |
| 463 | LLVMNonVirtualBases.push_back(LLVMBaseInfo(BaseDecl, FieldTypes.size())); |
| 464 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 465 | AppendBytes(NonVirtualSize / 8); |
| 466 | } |
| 467 | |
| 468 | void |
| 469 | CGRecordLayoutBuilder::LayoutNonVirtualBases(const CXXRecordDecl *RD, |
| 470 | const ASTRecordLayout &Layout) { |
| 471 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 472 | |
| 473 | // Check if we need to add a vtable pointer. |
| 474 | if (RD->isDynamicClass()) { |
| 475 | if (!PrimaryBase) { |
| 476 | const llvm::Type *FunctionType = |
| 477 | llvm::FunctionType::get(llvm::Type::getInt32Ty(Types.getLLVMContext()), |
| 478 | /*isVarArg=*/true); |
| 479 | const llvm::Type *VTableTy = FunctionType->getPointerTo(); |
| 480 | |
| 481 | assert(NextFieldOffsetInBytes == 0 && |
| 482 | "VTable pointer must come first!"); |
| 483 | AppendField(NextFieldOffsetInBytes, VTableTy->getPointerTo()); |
| 484 | } else { |
| 485 | // FIXME: Handle a virtual primary base. |
| 486 | if (!Layout.getPrimaryBaseWasVirtual()) |
| 487 | LayoutNonVirtualBase(PrimaryBase, 0); |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | // Layout the non-virtual bases. |
| 492 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 493 | E = RD->bases_end(); I != E; ++I) { |
| 494 | if (I->isVirtual()) |
| 495 | continue; |
| 496 | |
| 497 | const CXXRecordDecl *BaseDecl = |
| 498 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 499 | |
| 500 | // We've already laid out the primary base. |
| 501 | if (BaseDecl == PrimaryBase && !Layout.getPrimaryBaseWasVirtual()) |
| 502 | continue; |
| 503 | |
| 504 | LayoutNonVirtualBase(BaseDecl, Layout.getBaseClassOffset(BaseDecl)); |
Anders Carlsson | 4b3e5be | 2009-12-16 17:27:20 +0000 | [diff] [blame] | 505 | } |
| 506 | } |
| 507 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 508 | bool CGRecordLayoutBuilder::LayoutFields(const RecordDecl *D) { |
| 509 | assert(!D->isUnion() && "Can't call LayoutFields on a union!"); |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 510 | assert(Alignment && "Did not set alignment!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 511 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 512 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 513 | |
Anders Carlsson | 4b3e5be | 2009-12-16 17:27:20 +0000 | [diff] [blame] | 514 | if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 515 | LayoutNonVirtualBases(RD, Layout); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 516 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 517 | unsigned FieldNo = 0; |
Fariborz Jahanian | cad8665 | 2009-07-27 20:57:45 +0000 | [diff] [blame] | 518 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 519 | for (RecordDecl::field_iterator Field = D->field_begin(), |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 520 | FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
| 521 | if (!LayoutField(*Field, Layout.getFieldOffset(FieldNo))) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 522 | assert(!Packed && |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 523 | "Could not layout fields even with a packed LLVM struct!"); |
| 524 | return false; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | // Append tail padding if necessary. |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 529 | AppendTailPadding(Layout.getSize()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 530 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 531 | return true; |
| 532 | } |
| 533 | |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 534 | void CGRecordLayoutBuilder::AppendTailPadding(uint64_t RecordSize) { |
| 535 | assert(RecordSize % 8 == 0 && "Invalid record size!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 536 | |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 537 | uint64_t RecordSizeInBytes = RecordSize / 8; |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 538 | assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 539 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 540 | uint64_t AlignedNextFieldOffset = |
Anders Carlsson | c245682 | 2009-12-08 01:24:23 +0000 | [diff] [blame] | 541 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, AlignmentAsLLVMStruct); |
| 542 | |
| 543 | if (AlignedNextFieldOffset == RecordSizeInBytes) { |
| 544 | // We don't need any padding. |
| 545 | return; |
| 546 | } |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 547 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 548 | unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes; |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 549 | AppendBytes(NumPadBytes); |
| 550 | } |
| 551 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 552 | void CGRecordLayoutBuilder::AppendField(uint64_t FieldOffsetInBytes, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 553 | const llvm::Type *FieldTy) { |
| 554 | AlignmentAsLLVMStruct = std::max(AlignmentAsLLVMStruct, |
| 555 | getTypeAlignment(FieldTy)); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 556 | |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 557 | uint64_t FieldSizeInBytes = Types.getTargetData().getTypeAllocSize(FieldTy); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 558 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 559 | FieldTypes.push_back(FieldTy); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 560 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 561 | NextFieldOffsetInBytes = FieldOffsetInBytes + FieldSizeInBytes; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 562 | BitsAvailableInLastField = 0; |
| 563 | } |
| 564 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 565 | void CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 566 | unsigned FieldAlignment) { |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 567 | assert(NextFieldOffsetInBytes <= FieldOffsetInBytes && |
| 568 | "Incorrect field layout!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 569 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 570 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 571 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 572 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment); |
| 573 | |
| 574 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 575 | // Even with alignment, the field offset is not at the right place, |
| 576 | // insert padding. |
| 577 | uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes; |
| 578 | |
| 579 | AppendBytes(PaddingInBytes); |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | void CGRecordLayoutBuilder::AppendBytes(uint64_t NumBytes) { |
| 584 | if (NumBytes == 0) |
| 585 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 586 | |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 587 | const llvm::Type *Ty = llvm::Type::getInt8Ty(Types.getLLVMContext()); |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 588 | if (NumBytes > 1) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 589 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 590 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 591 | // Append the padding field |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 592 | AppendField(NextFieldOffsetInBytes, Ty); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | unsigned CGRecordLayoutBuilder::getTypeAlignment(const llvm::Type *Ty) const { |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 596 | if (Packed) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 597 | return 1; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 598 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 599 | return Types.getTargetData().getABITypeAlignment(Ty); |
| 600 | } |
| 601 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 602 | void CGRecordLayoutBuilder::CheckForPointerToDataMember(QualType T) { |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 603 | // This record already contains a member pointer. |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 604 | if (ContainsPointerToDataMember) |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 605 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 606 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 607 | // Can only have member pointers if we're compiling C++. |
| 608 | if (!Types.getContext().getLangOptions().CPlusPlus) |
| 609 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 610 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 611 | T = Types.getContext().getBaseElementType(T); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 612 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 613 | if (const MemberPointerType *MPT = T->getAs<MemberPointerType>()) { |
| 614 | if (!MPT->getPointeeType()->isFunctionType()) { |
| 615 | // We have a pointer to data member. |
| 616 | ContainsPointerToDataMember = true; |
| 617 | } |
| 618 | } else if (const RecordType *RT = T->getAs<RecordType>()) { |
| 619 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 620 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 621 | // FIXME: It would be better if there was a way to explicitly compute the |
| 622 | // record layout instead of converting to a type. |
| 623 | Types.ConvertTagDeclType(RD); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 624 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 625 | const CGRecordLayout &Layout = Types.getCGRecordLayout(RD); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 626 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 627 | if (Layout.containsPointerToDataMember()) |
| 628 | ContainsPointerToDataMember = true; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 629 | } |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 630 | } |
| 631 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 632 | CGRecordLayout *CodeGenTypes::ComputeRecordLayout(const RecordDecl *D) { |
| 633 | CGRecordLayoutBuilder Builder(*this); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 634 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 635 | Builder.Layout(D); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 636 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 637 | const llvm::Type *Ty = llvm::StructType::get(getLLVMContext(), |
Owen Anderson | 47a434f | 2009-08-05 23:18:46 +0000 | [diff] [blame] | 638 | Builder.FieldTypes, |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 639 | Builder.Packed); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 640 | |
Daniel Dunbar | 198bcb4 | 2010-03-31 01:09:11 +0000 | [diff] [blame] | 641 | CGRecordLayout *RL = |
| 642 | new CGRecordLayout(Ty, Builder.ContainsPointerToDataMember); |
| 643 | |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 644 | // Add all the non-virtual base field numbers. |
| 645 | RL->NonVirtualBaseFields.insert(Builder.LLVMNonVirtualBases.begin(), |
| 646 | Builder.LLVMNonVirtualBases.end()); |
| 647 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 648 | // Add all the field numbers. |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 649 | RL->FieldInfo.insert(Builder.LLVMFields.begin(), |
| 650 | Builder.LLVMFields.end()); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 651 | |
| 652 | // Add bitfield info. |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 653 | RL->BitFields.insert(Builder.LLVMBitFields.begin(), |
| 654 | Builder.LLVMBitFields.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 655 | |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 656 | // Dump the layout, if requested. |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 657 | if (getContext().getLangOptions().DumpRecordLayouts) { |
Daniel Dunbar | 8d8ab74 | 2010-04-19 20:44:53 +0000 | [diff] [blame] | 658 | llvm::errs() << "\n*** Dumping IRgen Record Layout\n"; |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 659 | llvm::errs() << "Record: "; |
| 660 | D->dump(); |
| 661 | llvm::errs() << "\nLayout: "; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 662 | RL->dump(); |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 663 | } |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 664 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 665 | #ifndef NDEBUG |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 666 | // Verify that the computed LLVM struct size matches the AST layout size. |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 667 | uint64_t TypeSizeInBits = getContext().getASTRecordLayout(D).getSize(); |
| 668 | assert(TypeSizeInBits == getTargetData().getTypeAllocSizeInBits(Ty) && |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 669 | "Type size mismatch!"); |
| 670 | |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 671 | // Verify that the LLVM and AST field offsets agree. |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 672 | const llvm::StructType *ST = |
| 673 | dyn_cast<llvm::StructType>(RL->getLLVMType()); |
| 674 | const llvm::StructLayout *SL = getTargetData().getStructLayout(ST); |
| 675 | |
| 676 | const ASTRecordLayout &AST_RL = getContext().getASTRecordLayout(D); |
| 677 | RecordDecl::field_iterator it = D->field_begin(); |
| 678 | for (unsigned i = 0, e = AST_RL.getFieldCount(); i != e; ++i, ++it) { |
| 679 | const FieldDecl *FD = *it; |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 680 | |
| 681 | // For non-bit-fields, just check that the LLVM struct offset matches the |
| 682 | // AST offset. |
| 683 | if (!FD->isBitField()) { |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 684 | unsigned FieldNo = RL->getLLVMFieldNo(FD); |
| 685 | assert(AST_RL.getFieldOffset(i) == SL->getElementOffsetInBits(FieldNo) && |
| 686 | "Invalid field offset!"); |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 687 | continue; |
| 688 | } |
| 689 | |
| 690 | // Ignore unnamed bit-fields. |
| 691 | if (!FD->getDeclName()) |
| 692 | continue; |
| 693 | |
| 694 | const CGBitFieldInfo &Info = RL->getBitFieldInfo(FD); |
| 695 | for (unsigned i = 0, e = Info.getNumComponents(); i != e; ++i) { |
| 696 | const CGBitFieldInfo::AccessInfo &AI = Info.getComponent(i); |
| 697 | |
| 698 | // Verify that every component access is within the structure. |
| 699 | uint64_t FieldOffset = SL->getElementOffsetInBits(AI.FieldIndex); |
| 700 | uint64_t AccessBitOffset = FieldOffset + AI.FieldByteOffset * 8; |
| 701 | assert(AccessBitOffset + AI.AccessWidth <= TypeSizeInBits && |
| 702 | "Invalid bit-field access (out of range)!"); |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 703 | } |
| 704 | } |
| 705 | #endif |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 706 | |
Daniel Dunbar | 198bcb4 | 2010-03-31 01:09:11 +0000 | [diff] [blame] | 707 | return RL; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 708 | } |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 709 | |
| 710 | void CGRecordLayout::print(llvm::raw_ostream &OS) const { |
| 711 | OS << "<CGRecordLayout\n"; |
| 712 | OS << " LLVMType:" << *LLVMType << "\n"; |
| 713 | OS << " ContainsPointerToDataMember:" << ContainsPointerToDataMember << "\n"; |
| 714 | OS << " BitFields:[\n"; |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 715 | |
| 716 | // Print bit-field infos in declaration order. |
| 717 | std::vector<std::pair<unsigned, const CGBitFieldInfo*> > BFIs; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 718 | for (llvm::DenseMap<const FieldDecl*, CGBitFieldInfo>::const_iterator |
| 719 | it = BitFields.begin(), ie = BitFields.end(); |
| 720 | it != ie; ++it) { |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 721 | const RecordDecl *RD = it->first->getParent(); |
| 722 | unsigned Index = 0; |
| 723 | for (RecordDecl::field_iterator |
| 724 | it2 = RD->field_begin(); *it2 != it->first; ++it2) |
| 725 | ++Index; |
| 726 | BFIs.push_back(std::make_pair(Index, &it->second)); |
| 727 | } |
| 728 | llvm::array_pod_sort(BFIs.begin(), BFIs.end()); |
| 729 | for (unsigned i = 0, e = BFIs.size(); i != e; ++i) { |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 730 | OS.indent(4); |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 731 | BFIs[i].second->print(OS); |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 732 | OS << "\n"; |
| 733 | } |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 734 | |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 735 | OS << "]>\n"; |
| 736 | } |
| 737 | |
| 738 | void CGRecordLayout::dump() const { |
| 739 | print(llvm::errs()); |
| 740 | } |
| 741 | |
| 742 | void CGBitFieldInfo::print(llvm::raw_ostream &OS) const { |
| 743 | OS << "<CGBitFieldInfo"; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 744 | OS << " Size:" << Size; |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 745 | OS << " IsSigned:" << IsSigned << "\n"; |
| 746 | |
| 747 | OS.indent(4 + strlen("<CGBitFieldInfo")); |
| 748 | OS << " NumComponents:" << getNumComponents(); |
| 749 | OS << " Components: ["; |
| 750 | if (getNumComponents()) { |
| 751 | OS << "\n"; |
| 752 | for (unsigned i = 0, e = getNumComponents(); i != e; ++i) { |
| 753 | const AccessInfo &AI = getComponent(i); |
| 754 | OS.indent(8); |
| 755 | OS << "<AccessInfo" |
| 756 | << " FieldIndex:" << AI.FieldIndex |
| 757 | << " FieldByteOffset:" << AI.FieldByteOffset |
| 758 | << " FieldBitStart:" << AI.FieldBitStart |
| 759 | << " AccessWidth:" << AI.AccessWidth << "\n"; |
| 760 | OS.indent(8 + strlen("<AccessInfo")); |
| 761 | OS << " AccessAlignment:" << AI.AccessAlignment |
| 762 | << " TargetBitOffset:" << AI.TargetBitOffset |
| 763 | << " TargetBitWidth:" << AI.TargetBitWidth |
| 764 | << ">\n"; |
| 765 | } |
| 766 | OS.indent(4); |
| 767 | } |
| 768 | OS << "]>"; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | void CGBitFieldInfo::dump() const { |
| 772 | print(llvm::errs()); |
| 773 | } |