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" |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 21 | #include "CGCXXABI.h" |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 22 | #include "llvm/DerivedTypes.h" |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 23 | #include "llvm/Type.h" |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 24 | #include "llvm/Support/Debug.h" |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 25 | #include "llvm/Support/raw_ostream.h" |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 26 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 27 | using namespace clang; |
| 28 | using namespace CodeGen; |
| 29 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 30 | namespace clang { |
| 31 | namespace CodeGen { |
| 32 | |
| 33 | class CGRecordLayoutBuilder { |
| 34 | public: |
| 35 | /// FieldTypes - Holds the LLVM types that the struct is created from. |
| 36 | std::vector<const llvm::Type *> FieldTypes; |
| 37 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 38 | /// NonVirtualBaseFieldTypes - Holds the LLVM types for the non-virtual part |
| 39 | /// of the struct. For example, consider: |
| 40 | /// |
| 41 | /// struct A { int i; }; |
| 42 | /// struct B { void *v; }; |
| 43 | /// struct C : virtual A, B { }; |
| 44 | /// |
| 45 | /// The LLVM type of C will be |
| 46 | /// %struct.C = type { i32 (...)**, %struct.A, i32, %struct.B } |
| 47 | /// |
| 48 | /// And the LLVM type of the non-virtual base struct will be |
| 49 | /// %struct.C.base = type { i32 (...)**, %struct.A, i32 } |
| 50 | std::vector<const llvm::Type *> NonVirtualBaseFieldTypes; |
| 51 | |
| 52 | /// NonVirtualBaseTypeIsSameAsCompleteType - Whether the non-virtual part of |
| 53 | /// the struct is equivalent to the complete struct. |
| 54 | bool NonVirtualBaseTypeIsSameAsCompleteType; |
| 55 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 56 | /// LLVMFieldInfo - Holds a field and its corresponding LLVM field number. |
| 57 | typedef std::pair<const FieldDecl *, unsigned> LLVMFieldInfo; |
| 58 | llvm::SmallVector<LLVMFieldInfo, 16> LLVMFields; |
| 59 | |
| 60 | /// LLVMBitFieldInfo - Holds location and size information about a bit field. |
Daniel Dunbar | c7a984a | 2010-04-06 01:07:41 +0000 | [diff] [blame] | 61 | typedef std::pair<const FieldDecl *, CGBitFieldInfo> LLVMBitFieldInfo; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 62 | llvm::SmallVector<LLVMBitFieldInfo, 16> LLVMBitFields; |
| 63 | |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 64 | typedef std::pair<const CXXRecordDecl *, unsigned> LLVMBaseInfo; |
| 65 | llvm::SmallVector<LLVMBaseInfo, 16> LLVMNonVirtualBases; |
| 66 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 67 | /// IsZeroInitializable - Whether this struct can be C++ |
| 68 | /// zero-initialized with an LLVM zeroinitializer. |
| 69 | bool IsZeroInitializable; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 70 | |
| 71 | /// Packed - Whether the resulting LLVM struct will be packed or not. |
| 72 | bool Packed; |
| 73 | |
| 74 | private: |
| 75 | CodeGenTypes &Types; |
| 76 | |
| 77 | /// Alignment - Contains the alignment of the RecordDecl. |
| 78 | // |
| 79 | // FIXME: This is not needed and should be removed. |
| 80 | unsigned Alignment; |
| 81 | |
| 82 | /// AlignmentAsLLVMStruct - Will contain the maximum alignment of all the |
| 83 | /// LLVM types. |
| 84 | unsigned AlignmentAsLLVMStruct; |
| 85 | |
| 86 | /// BitsAvailableInLastField - If a bit field spans only part of a LLVM field, |
| 87 | /// this will have the number of bits still available in the field. |
| 88 | char BitsAvailableInLastField; |
| 89 | |
| 90 | /// NextFieldOffsetInBytes - Holds the next field offset in bytes. |
| 91 | uint64_t NextFieldOffsetInBytes; |
| 92 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 93 | /// LayoutUnionField - Will layout a field in an union and return the type |
| 94 | /// that the field will have. |
| 95 | const llvm::Type *LayoutUnionField(const FieldDecl *Field, |
| 96 | const ASTRecordLayout &Layout); |
| 97 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 98 | /// LayoutUnion - Will layout a union RecordDecl. |
| 99 | void LayoutUnion(const RecordDecl *D); |
| 100 | |
| 101 | /// LayoutField - try to layout all fields in the record decl. |
| 102 | /// Returns false if the operation failed because the struct is not packed. |
| 103 | bool LayoutFields(const RecordDecl *D); |
| 104 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 105 | /// LayoutNonVirtualBase - layout a single non-virtual base. |
| 106 | void LayoutNonVirtualBase(const CXXRecordDecl *BaseDecl, |
| 107 | uint64_t BaseOffset); |
| 108 | |
| 109 | /// LayoutNonVirtualBases - layout the non-virtual bases of a record decl. |
| 110 | void LayoutNonVirtualBases(const CXXRecordDecl *RD, |
| 111 | const ASTRecordLayout &Layout); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 112 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 113 | /// ComputeNonVirtualBaseType - Compute the non-virtual base field types. |
| 114 | void ComputeNonVirtualBaseType(const CXXRecordDecl *RD); |
| 115 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 116 | /// LayoutField - layout a single field. Returns false if the operation failed |
| 117 | /// because the current struct is not packed. |
| 118 | bool LayoutField(const FieldDecl *D, uint64_t FieldOffset); |
| 119 | |
| 120 | /// LayoutBitField - layout a single bit field. |
| 121 | void LayoutBitField(const FieldDecl *D, uint64_t FieldOffset); |
| 122 | |
| 123 | /// AppendField - Appends a field with the given offset and type. |
| 124 | void AppendField(uint64_t FieldOffsetInBytes, const llvm::Type *FieldTy); |
| 125 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 126 | /// AppendPadding - Appends enough padding bytes so that the total |
| 127 | /// struct size is a multiple of the field alignment. |
| 128 | void AppendPadding(uint64_t FieldOffsetInBytes, unsigned FieldAlignment); |
| 129 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 130 | /// getByteArrayType - Returns a byte array type with the given number of |
| 131 | /// elements. |
| 132 | const llvm::Type *getByteArrayType(uint64_t NumBytes); |
| 133 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 134 | /// AppendBytes - Append a given number of bytes to the record. |
| 135 | void AppendBytes(uint64_t NumBytes); |
| 136 | |
| 137 | /// AppendTailPadding - Append enough tail padding so that the type will have |
| 138 | /// the passed size. |
| 139 | void AppendTailPadding(uint64_t RecordSize); |
| 140 | |
| 141 | unsigned getTypeAlignment(const llvm::Type *Ty) const; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 142 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 143 | /// CheckZeroInitializable - Check if the given type contains a pointer |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 144 | /// to data member. |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 145 | void CheckZeroInitializable(QualType T); |
| 146 | void CheckZeroInitializable(const CXXRecordDecl *RD); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 147 | |
| 148 | public: |
| 149 | CGRecordLayoutBuilder(CodeGenTypes &Types) |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 150 | : NonVirtualBaseTypeIsSameAsCompleteType(false), IsZeroInitializable(true), |
| 151 | Packed(false), Types(Types), Alignment(0), AlignmentAsLLVMStruct(1), |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 152 | BitsAvailableInLastField(0), NextFieldOffsetInBytes(0) { } |
| 153 | |
| 154 | /// Layout - Will layout a RecordDecl. |
| 155 | void Layout(const RecordDecl *D); |
| 156 | }; |
| 157 | |
| 158 | } |
| 159 | } |
| 160 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 161 | void CGRecordLayoutBuilder::Layout(const RecordDecl *D) { |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 162 | Alignment = Types.getContext().getASTRecordLayout(D).getAlignment() / 8; |
Anders Carlsson | d0eb3b9 | 2009-09-02 17:51:33 +0000 | [diff] [blame] | 163 | Packed = D->hasAttr<PackedAttr>(); |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 164 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 165 | if (D->isUnion()) { |
| 166 | LayoutUnion(D); |
| 167 | return; |
| 168 | } |
Anders Carlsson | a860e75 | 2009-08-08 18:23:56 +0000 | [diff] [blame] | 169 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 170 | if (LayoutFields(D)) |
| 171 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 172 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 173 | // 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] | 174 | Packed = true; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 175 | AlignmentAsLLVMStruct = 1; |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 176 | NextFieldOffsetInBytes = 0; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 177 | FieldTypes.clear(); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 178 | LLVMFields.clear(); |
| 179 | LLVMBitFields.clear(); |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 180 | LLVMNonVirtualBases.clear(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 181 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 182 | LayoutFields(D); |
| 183 | } |
| 184 | |
Daniel Dunbar | e7a80bd | 2010-09-02 23:53:28 +0000 | [diff] [blame] | 185 | CGBitFieldInfo CGBitFieldInfo::MakeInfo(CodeGenTypes &Types, |
| 186 | const FieldDecl *FD, |
| 187 | uint64_t FieldOffset, |
| 188 | uint64_t FieldSize, |
| 189 | uint64_t ContainingTypeSizeInBits, |
| 190 | unsigned ContainingTypeAlign) { |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 191 | const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(FD->getType()); |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 192 | uint64_t TypeSizeInBytes = Types.getTargetData().getTypeAllocSize(Ty); |
| 193 | uint64_t TypeSizeInBits = TypeSizeInBytes * 8; |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 194 | |
| 195 | bool IsSigned = FD->getType()->isSignedIntegerType(); |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 196 | |
Anders Carlsson | 1c7658f | 2010-04-16 16:23:02 +0000 | [diff] [blame] | 197 | if (FieldSize > TypeSizeInBits) { |
Anders Carlsson | 6ba3815 | 2010-04-17 22:54:57 +0000 | [diff] [blame] | 198 | // We have a wide bit-field. The extra bits are only used for padding, so |
| 199 | // if we have a bitfield of type T, with size N: |
| 200 | // |
| 201 | // T t : N; |
| 202 | // |
| 203 | // We can just assume that it's: |
| 204 | // |
| 205 | // T t : sizeof(T); |
| 206 | // |
| 207 | FieldSize = TypeSizeInBits; |
Anders Carlsson | 1c7658f | 2010-04-16 16:23:02 +0000 | [diff] [blame] | 208 | } |
| 209 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 210 | // Compute the access components. The policy we use is to start by attempting |
| 211 | // to access using the width of the bit-field type itself and to always access |
| 212 | // at aligned indices of that type. If such an access would fail because it |
| 213 | // extends past the bound of the type, then we reduce size to the next smaller |
| 214 | // power of two and retry. The current algorithm assumes pow2 sized types, |
| 215 | // although this is easy to fix. |
| 216 | // |
| 217 | // FIXME: This algorithm is wrong on big-endian systems, I think. |
| 218 | assert(llvm::isPowerOf2_32(TypeSizeInBits) && "Unexpected type size!"); |
| 219 | CGBitFieldInfo::AccessInfo Components[3]; |
| 220 | unsigned NumComponents = 0; |
| 221 | unsigned AccessedTargetBits = 0; // The tumber of target bits accessed. |
| 222 | unsigned AccessWidth = TypeSizeInBits; // The current access width to attempt. |
Anders Carlsson | 1c7658f | 2010-04-16 16:23:02 +0000 | [diff] [blame] | 223 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 224 | // Round down from the field offset to find the first access position that is |
| 225 | // at an aligned offset of the initial access type. |
Daniel Dunbar | 52968a1 | 2010-04-22 15:22:33 +0000 | [diff] [blame] | 226 | uint64_t AccessStart = FieldOffset - (FieldOffset % AccessWidth); |
| 227 | |
| 228 | // Adjust initial access size to fit within record. |
| 229 | while (AccessWidth > 8 && |
| 230 | AccessStart + AccessWidth > ContainingTypeSizeInBits) { |
| 231 | AccessWidth >>= 1; |
| 232 | AccessStart = FieldOffset - (FieldOffset % AccessWidth); |
| 233 | } |
Daniel Dunbar | 2df2569 | 2010-04-15 05:09:32 +0000 | [diff] [blame] | 234 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 235 | while (AccessedTargetBits < FieldSize) { |
| 236 | // Check that we can access using a type of this size, without reading off |
| 237 | // the end of the structure. This can occur with packed structures and |
| 238 | // -fno-bitfield-type-align, for example. |
| 239 | if (AccessStart + AccessWidth > ContainingTypeSizeInBits) { |
| 240 | // If so, reduce access size to the next smaller power-of-two and retry. |
| 241 | AccessWidth >>= 1; |
| 242 | assert(AccessWidth >= 8 && "Cannot access under byte size!"); |
| 243 | continue; |
| 244 | } |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 245 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 246 | // Otherwise, add an access component. |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 247 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 248 | // First, compute the bits inside this access which are part of the |
| 249 | // target. We are reading bits [AccessStart, AccessStart + AccessWidth); the |
| 250 | // intersection with [FieldOffset, FieldOffset + FieldSize) gives the bits |
| 251 | // in the target that we are reading. |
Daniel Dunbar | 52968a1 | 2010-04-22 15:22:33 +0000 | [diff] [blame] | 252 | assert(FieldOffset < AccessStart + AccessWidth && "Invalid access start!"); |
| 253 | assert(AccessStart < FieldOffset + FieldSize && "Invalid access start!"); |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 254 | uint64_t AccessBitsInFieldStart = std::max(AccessStart, FieldOffset); |
| 255 | uint64_t AccessBitsInFieldSize = |
Daniel Dunbar | 52968a1 | 2010-04-22 15:22:33 +0000 | [diff] [blame] | 256 | std::min(AccessWidth + AccessStart, |
| 257 | FieldOffset + FieldSize) - AccessBitsInFieldStart; |
Daniel Dunbar | 4651efb | 2010-04-22 14:56:10 +0000 | [diff] [blame] | 258 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 259 | assert(NumComponents < 3 && "Unexpected number of components!"); |
| 260 | CGBitFieldInfo::AccessInfo &AI = Components[NumComponents++]; |
| 261 | AI.FieldIndex = 0; |
| 262 | // FIXME: We still follow the old access pattern of only using the field |
| 263 | // byte offset. We should switch this once we fix the struct layout to be |
| 264 | // pretty. |
| 265 | AI.FieldByteOffset = AccessStart / 8; |
| 266 | AI.FieldBitStart = AccessBitsInFieldStart - AccessStart; |
| 267 | AI.AccessWidth = AccessWidth; |
Daniel Dunbar | 89da874 | 2010-04-22 03:17:04 +0000 | [diff] [blame] | 268 | AI.AccessAlignment = llvm::MinAlign(ContainingTypeAlign, AccessStart) / 8; |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 269 | AI.TargetBitOffset = AccessedTargetBits; |
| 270 | AI.TargetBitWidth = AccessBitsInFieldSize; |
| 271 | |
| 272 | AccessStart += AccessWidth; |
| 273 | AccessedTargetBits += AI.TargetBitWidth; |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 274 | } |
| 275 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 276 | assert(AccessedTargetBits == FieldSize && "Invalid bit-field access!"); |
Daniel Dunbar | 2df2569 | 2010-04-15 05:09:32 +0000 | [diff] [blame] | 277 | return CGBitFieldInfo(FieldSize, NumComponents, Components, IsSigned); |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 278 | } |
| 279 | |
Daniel Dunbar | e7a80bd | 2010-09-02 23:53:28 +0000 | [diff] [blame] | 280 | CGBitFieldInfo CGBitFieldInfo::MakeInfo(CodeGenTypes &Types, |
| 281 | const FieldDecl *FD, |
| 282 | uint64_t FieldOffset, |
| 283 | uint64_t FieldSize) { |
| 284 | const RecordDecl *RD = FD->getParent(); |
| 285 | const ASTRecordLayout &RL = Types.getContext().getASTRecordLayout(RD); |
| 286 | uint64_t ContainingTypeSizeInBits = RL.getSize(); |
| 287 | unsigned ContainingTypeAlign = RL.getAlignment(); |
| 288 | |
| 289 | return MakeInfo(Types, FD, FieldOffset, FieldSize, ContainingTypeSizeInBits, |
| 290 | ContainingTypeAlign); |
| 291 | } |
| 292 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 293 | void CGRecordLayoutBuilder::LayoutBitField(const FieldDecl *D, |
| 294 | uint64_t FieldOffset) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 295 | uint64_t FieldSize = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 296 | D->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 297 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 298 | if (FieldSize == 0) |
| 299 | return; |
| 300 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 301 | uint64_t NextFieldOffset = NextFieldOffsetInBytes * 8; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 302 | unsigned NumBytesToAppend; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 303 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 304 | if (FieldOffset < NextFieldOffset) { |
| 305 | assert(BitsAvailableInLastField && "Bitfield size mismatch!"); |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 306 | assert(NextFieldOffsetInBytes && "Must have laid out at least one byte!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 307 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 308 | // The bitfield begins in the previous bit-field. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 309 | NumBytesToAppend = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 310 | llvm::RoundUpToAlignment(FieldSize - BitsAvailableInLastField, 8) / 8; |
| 311 | } else { |
| 312 | assert(FieldOffset % 8 == 0 && "Field offset not aligned correctly"); |
| 313 | |
| 314 | // Append padding if necessary. |
| 315 | AppendBytes((FieldOffset - NextFieldOffset) / 8); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 316 | |
| 317 | NumBytesToAppend = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 318 | llvm::RoundUpToAlignment(FieldSize, 8) / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 319 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 320 | assert(NumBytesToAppend && "No bytes to append!"); |
| 321 | } |
| 322 | |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 323 | // Add the bit field info. |
| 324 | LLVMBitFields.push_back( |
Daniel Dunbar | e7a80bd | 2010-09-02 23:53:28 +0000 | [diff] [blame] | 325 | LLVMBitFieldInfo(D, CGBitFieldInfo::MakeInfo(Types, D, FieldOffset, |
| 326 | FieldSize))); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 327 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 328 | AppendBytes(NumBytesToAppend); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 329 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 330 | BitsAvailableInLastField = |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 331 | NextFieldOffsetInBytes * 8 - (FieldOffset + FieldSize); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D, |
| 335 | uint64_t FieldOffset) { |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 336 | // If the field is packed, then we need a packed struct. |
Anders Carlsson | a860e75 | 2009-08-08 18:23:56 +0000 | [diff] [blame] | 337 | if (!Packed && D->hasAttr<PackedAttr>()) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 338 | return false; |
| 339 | |
| 340 | if (D->isBitField()) { |
| 341 | // We must use packed structs for unnamed bit fields since they |
| 342 | // don't affect the struct alignment. |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 343 | if (!Packed && !D->getDeclName()) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 344 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 345 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 346 | LayoutBitField(D, FieldOffset); |
| 347 | return true; |
| 348 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 349 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 350 | CheckZeroInitializable(D->getType()); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 351 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 352 | assert(FieldOffset % 8 == 0 && "FieldOffset is not on a byte boundary!"); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 353 | uint64_t FieldOffsetInBytes = FieldOffset / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 354 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 355 | const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(D->getType()); |
| 356 | unsigned TypeAlignment = getTypeAlignment(Ty); |
| 357 | |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 358 | // If the type alignment is larger then the struct alignment, we must use |
| 359 | // a packed struct. |
| 360 | if (TypeAlignment > Alignment) { |
| 361 | assert(!Packed && "Alignment is wrong even with packed struct!"); |
| 362 | return false; |
| 363 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 364 | |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 365 | if (const RecordType *RT = D->getType()->getAs<RecordType>()) { |
| 366 | const RecordDecl *RD = cast<RecordDecl>(RT->getDecl()); |
Daniel Dunbar | 8a2c92c | 2010-05-27 01:12:46 +0000 | [diff] [blame] | 367 | if (const MaxFieldAlignmentAttr *MFAA = |
| 368 | RD->getAttr<MaxFieldAlignmentAttr>()) { |
| 369 | if (MFAA->getAlignment() != TypeAlignment * 8 && !Packed) |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 370 | return false; |
| 371 | } |
| 372 | } |
| 373 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 374 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 375 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 376 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, TypeAlignment); |
| 377 | |
| 378 | if (FieldOffsetInBytes < AlignedNextFieldOffsetInBytes) { |
| 379 | assert(!Packed && "Could not place field even with packed struct!"); |
| 380 | return false; |
| 381 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 382 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 383 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 384 | // Even with alignment, the field offset is not at the right place, |
| 385 | // insert padding. |
| 386 | uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 387 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 388 | AppendBytes(PaddingInBytes); |
| 389 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 390 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 391 | // Now append the field. |
| 392 | LLVMFields.push_back(LLVMFieldInfo(D, FieldTypes.size())); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 393 | AppendField(FieldOffsetInBytes, Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 394 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 395 | return true; |
| 396 | } |
| 397 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 398 | const llvm::Type * |
| 399 | CGRecordLayoutBuilder::LayoutUnionField(const FieldDecl *Field, |
| 400 | const ASTRecordLayout &Layout) { |
| 401 | if (Field->isBitField()) { |
| 402 | uint64_t FieldSize = |
| 403 | Field->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue(); |
| 404 | |
| 405 | // Ignore zero sized bit fields. |
| 406 | if (FieldSize == 0) |
| 407 | return 0; |
| 408 | |
Daniel Dunbar | 8ab78a7 | 2010-04-20 17:52:30 +0000 | [diff] [blame] | 409 | const llvm::Type *FieldTy = llvm::Type::getInt8Ty(Types.getLLVMContext()); |
| 410 | unsigned NumBytesToAppend = |
| 411 | llvm::RoundUpToAlignment(FieldSize, 8) / 8; |
Anders Carlsson | d62328e | 2010-04-17 21:04:52 +0000 | [diff] [blame] | 412 | |
Daniel Dunbar | 8ab78a7 | 2010-04-20 17:52:30 +0000 | [diff] [blame] | 413 | if (NumBytesToAppend > 1) |
| 414 | FieldTy = llvm::ArrayType::get(FieldTy, NumBytesToAppend); |
Anders Carlsson | d62328e | 2010-04-17 21:04:52 +0000 | [diff] [blame] | 415 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 416 | // Add the bit field info. |
| 417 | LLVMBitFields.push_back( |
Daniel Dunbar | e7a80bd | 2010-09-02 23:53:28 +0000 | [diff] [blame] | 418 | LLVMBitFieldInfo(Field, CGBitFieldInfo::MakeInfo(Types, Field, |
| 419 | 0, FieldSize))); |
Anders Carlsson | d62328e | 2010-04-17 21:04:52 +0000 | [diff] [blame] | 420 | return FieldTy; |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 421 | } |
Daniel Dunbar | 8ab78a7 | 2010-04-20 17:52:30 +0000 | [diff] [blame] | 422 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 423 | // This is a regular union field. |
| 424 | LLVMFields.push_back(LLVMFieldInfo(Field, 0)); |
| 425 | return Types.ConvertTypeForMemRecursive(Field->getType()); |
| 426 | } |
| 427 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 428 | void CGRecordLayoutBuilder::LayoutUnion(const RecordDecl *D) { |
| 429 | assert(D->isUnion() && "Can't call LayoutUnion on a non-union record!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 430 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 431 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 432 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 433 | const llvm::Type *Ty = 0; |
| 434 | uint64_t Size = 0; |
| 435 | unsigned Align = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 436 | |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 437 | bool HasOnlyZeroSizedBitFields = true; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 438 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 439 | unsigned FieldNo = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 440 | for (RecordDecl::field_iterator Field = D->field_begin(), |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 441 | FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 442 | assert(Layout.getFieldOffset(FieldNo) == 0 && |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 443 | "Union field offset did not start at the beginning of record!"); |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 444 | const llvm::Type *FieldTy = LayoutUnionField(*Field, Layout); |
Anders Carlsson | 2cc8f17 | 2009-07-23 04:00:39 +0000 | [diff] [blame] | 445 | |
Anders Carlsson | 8666446 | 2010-04-17 20:49:27 +0000 | [diff] [blame] | 446 | if (!FieldTy) |
| 447 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 448 | |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 449 | HasOnlyZeroSizedBitFields = false; |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 450 | |
Anders Carlsson | 177d4d8 | 2009-07-23 21:52:03 +0000 | [diff] [blame] | 451 | unsigned FieldAlign = Types.getTargetData().getABITypeAlignment(FieldTy); |
| 452 | uint64_t FieldSize = Types.getTargetData().getTypeAllocSize(FieldTy); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 453 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 454 | if (FieldAlign < Align) |
| 455 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 456 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 457 | if (FieldAlign > Align || FieldSize > Size) { |
| 458 | Ty = FieldTy; |
| 459 | Align = FieldAlign; |
| 460 | Size = FieldSize; |
| 461 | } |
| 462 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 463 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 464 | // Now add our field. |
Anders Carlsson | 3662000 | 2009-09-03 22:56:02 +0000 | [diff] [blame] | 465 | if (Ty) { |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 466 | AppendField(0, Ty); |
Anders Carlsson | 3662000 | 2009-09-03 22:56:02 +0000 | [diff] [blame] | 467 | |
| 468 | if (getTypeAlignment(Ty) > Layout.getAlignment() / 8) { |
| 469 | // We need a packed struct. |
| 470 | Packed = true; |
| 471 | Align = 1; |
| 472 | } |
| 473 | } |
Fariborz Jahanian | e504170 | 2009-11-06 20:47:40 +0000 | [diff] [blame] | 474 | if (!Align) { |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 475 | assert(HasOnlyZeroSizedBitFields && |
| 476 | "0-align record did not have all zero-sized bit-fields!"); |
Fariborz Jahanian | e504170 | 2009-11-06 20:47:40 +0000 | [diff] [blame] | 477 | Align = 1; |
| 478 | } |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 479 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 480 | // Append tail padding. |
| 481 | if (Layout.getSize() / 8 > Size) |
| 482 | AppendPadding(Layout.getSize() / 8, Align); |
| 483 | } |
| 484 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 485 | void CGRecordLayoutBuilder::LayoutNonVirtualBase(const CXXRecordDecl *BaseDecl, |
| 486 | uint64_t BaseOffset) { |
Anders Carlsson | a03613d | 2010-11-22 00:03:08 +0000 | [diff] [blame] | 487 | // Ignore empty bases. |
| 488 | if (BaseDecl->isEmpty()) |
| 489 | return; |
| 490 | |
| 491 | CheckZeroInitializable(BaseDecl); |
| 492 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 493 | const ASTRecordLayout &Layout = |
| 494 | Types.getContext().getASTRecordLayout(BaseDecl); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 495 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 496 | uint64_t NonVirtualSize = Layout.getNonVirtualSize(); |
| 497 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 498 | // FIXME: Actually use a better type than [sizeof(BaseDecl) x i8] when we can. |
| 499 | AppendPadding(BaseOffset / 8, 1); |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 500 | |
| 501 | // Append the base field. |
| 502 | LLVMNonVirtualBases.push_back(LLVMBaseInfo(BaseDecl, FieldTypes.size())); |
| 503 | |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 504 | AppendBytes(NonVirtualSize / 8); |
| 505 | } |
| 506 | |
| 507 | void |
| 508 | CGRecordLayoutBuilder::LayoutNonVirtualBases(const CXXRecordDecl *RD, |
| 509 | const ASTRecordLayout &Layout) { |
| 510 | const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); |
| 511 | |
| 512 | // Check if we need to add a vtable pointer. |
| 513 | if (RD->isDynamicClass()) { |
| 514 | if (!PrimaryBase) { |
| 515 | const llvm::Type *FunctionType = |
| 516 | llvm::FunctionType::get(llvm::Type::getInt32Ty(Types.getLLVMContext()), |
| 517 | /*isVarArg=*/true); |
| 518 | const llvm::Type *VTableTy = FunctionType->getPointerTo(); |
| 519 | |
| 520 | assert(NextFieldOffsetInBytes == 0 && |
| 521 | "VTable pointer must come first!"); |
| 522 | AppendField(NextFieldOffsetInBytes, VTableTy->getPointerTo()); |
| 523 | } else { |
| 524 | // FIXME: Handle a virtual primary base. |
| 525 | if (!Layout.getPrimaryBaseWasVirtual()) |
| 526 | LayoutNonVirtualBase(PrimaryBase, 0); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | // Layout the non-virtual bases. |
| 531 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 532 | E = RD->bases_end(); I != E; ++I) { |
| 533 | if (I->isVirtual()) |
| 534 | continue; |
| 535 | |
| 536 | const CXXRecordDecl *BaseDecl = |
| 537 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 538 | |
| 539 | // We've already laid out the primary base. |
| 540 | if (BaseDecl == PrimaryBase && !Layout.getPrimaryBaseWasVirtual()) |
| 541 | continue; |
| 542 | |
Anders Carlsson | a14f597 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 543 | LayoutNonVirtualBase(BaseDecl, Layout.getBaseClassOffsetInBits(BaseDecl)); |
Anders Carlsson | 4b3e5be | 2009-12-16 17:27:20 +0000 | [diff] [blame] | 544 | } |
| 545 | } |
| 546 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 547 | void |
| 548 | CGRecordLayoutBuilder::ComputeNonVirtualBaseType(const CXXRecordDecl *RD) { |
| 549 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(RD); |
| 550 | |
| 551 | uint64_t AlignedNonVirtualTypeSize = |
| 552 | llvm::RoundUpToAlignment(Layout.getNonVirtualSize(), |
| 553 | Layout.getNonVirtualAlign()) / 8; |
| 554 | |
| 555 | |
| 556 | // First check if we can use the same fields as for the complete class. |
| 557 | if (AlignedNonVirtualTypeSize == Layout.getSize() / 8) { |
| 558 | NonVirtualBaseTypeIsSameAsCompleteType = true; |
| 559 | return; |
| 560 | } |
| 561 | |
| 562 | NonVirtualBaseFieldTypes = FieldTypes; |
| 563 | |
| 564 | // Check if we need padding. |
| 565 | uint64_t AlignedNextFieldOffset = |
| 566 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, AlignmentAsLLVMStruct); |
| 567 | |
| 568 | assert(AlignedNextFieldOffset <= AlignedNonVirtualTypeSize && |
| 569 | "Size mismatch!"); |
| 570 | |
| 571 | if (AlignedNonVirtualTypeSize == AlignedNextFieldOffset) { |
| 572 | // We don't need any padding. |
| 573 | return; |
| 574 | } |
| 575 | |
| 576 | uint64_t NumBytes = AlignedNonVirtualTypeSize - AlignedNextFieldOffset; |
| 577 | NonVirtualBaseFieldTypes.push_back(getByteArrayType(NumBytes)); |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 578 | } |
| 579 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 580 | bool CGRecordLayoutBuilder::LayoutFields(const RecordDecl *D) { |
| 581 | assert(!D->isUnion() && "Can't call LayoutFields on a union!"); |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 582 | assert(Alignment && "Did not set alignment!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 583 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 584 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 585 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 586 | const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D); |
| 587 | if (RD) |
Anders Carlsson | 15ddfdc | 2010-05-18 05:12:20 +0000 | [diff] [blame] | 588 | LayoutNonVirtualBases(RD, Layout); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 589 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 590 | unsigned FieldNo = 0; |
Fariborz Jahanian | cad8665 | 2009-07-27 20:57:45 +0000 | [diff] [blame] | 591 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 592 | for (RecordDecl::field_iterator Field = D->field_begin(), |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 593 | FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
| 594 | if (!LayoutField(*Field, Layout.getFieldOffset(FieldNo))) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 595 | assert(!Packed && |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 596 | "Could not layout fields even with a packed LLVM struct!"); |
| 597 | return false; |
| 598 | } |
| 599 | } |
| 600 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 601 | // We've laid out the non-virtual bases and the fields, now compute the |
| 602 | // non-virtual base field types. |
| 603 | if (RD) |
| 604 | ComputeNonVirtualBaseType(RD); |
| 605 | |
| 606 | // FIXME: Lay out the virtual bases instead of just treating them as tail |
| 607 | // padding. |
| 608 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 609 | // Append tail padding if necessary. |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 610 | AppendTailPadding(Layout.getSize()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 611 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 612 | return true; |
| 613 | } |
| 614 | |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 615 | void CGRecordLayoutBuilder::AppendTailPadding(uint64_t RecordSize) { |
| 616 | assert(RecordSize % 8 == 0 && "Invalid record size!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 617 | |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 618 | uint64_t RecordSizeInBytes = RecordSize / 8; |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 619 | assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 620 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 621 | uint64_t AlignedNextFieldOffset = |
Anders Carlsson | c245682 | 2009-12-08 01:24:23 +0000 | [diff] [blame] | 622 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, AlignmentAsLLVMStruct); |
| 623 | |
| 624 | if (AlignedNextFieldOffset == RecordSizeInBytes) { |
| 625 | // We don't need any padding. |
| 626 | return; |
| 627 | } |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 628 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 629 | unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes; |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 630 | AppendBytes(NumPadBytes); |
| 631 | } |
| 632 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 633 | void CGRecordLayoutBuilder::AppendField(uint64_t FieldOffsetInBytes, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 634 | const llvm::Type *FieldTy) { |
| 635 | AlignmentAsLLVMStruct = std::max(AlignmentAsLLVMStruct, |
| 636 | getTypeAlignment(FieldTy)); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 637 | |
Daniel Dunbar | 9b28daf | 2010-04-12 21:01:28 +0000 | [diff] [blame] | 638 | uint64_t FieldSizeInBytes = Types.getTargetData().getTypeAllocSize(FieldTy); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 639 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 640 | FieldTypes.push_back(FieldTy); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 641 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 642 | NextFieldOffsetInBytes = FieldOffsetInBytes + FieldSizeInBytes; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 643 | BitsAvailableInLastField = 0; |
| 644 | } |
| 645 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 646 | void CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 647 | unsigned FieldAlignment) { |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 648 | assert(NextFieldOffsetInBytes <= FieldOffsetInBytes && |
| 649 | "Incorrect field layout!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 650 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 651 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 652 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 653 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment); |
| 654 | |
| 655 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 656 | // Even with alignment, the field offset is not at the right place, |
| 657 | // insert padding. |
| 658 | uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes; |
| 659 | |
| 660 | AppendBytes(PaddingInBytes); |
| 661 | } |
| 662 | } |
| 663 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 664 | const llvm::Type *CGRecordLayoutBuilder::getByteArrayType(uint64_t NumBytes) { |
| 665 | assert(NumBytes != 0 && "Empty byte array's aren't allowed."); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 666 | |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 667 | const llvm::Type *Ty = llvm::Type::getInt8Ty(Types.getLLVMContext()); |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 668 | if (NumBytes > 1) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 669 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 670 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 671 | return Ty; |
| 672 | } |
| 673 | |
| 674 | void CGRecordLayoutBuilder::AppendBytes(uint64_t NumBytes) { |
| 675 | if (NumBytes == 0) |
| 676 | return; |
| 677 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 678 | // Append the padding field |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 679 | AppendField(NextFieldOffsetInBytes, getByteArrayType(NumBytes)); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | unsigned CGRecordLayoutBuilder::getTypeAlignment(const llvm::Type *Ty) const { |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 683 | if (Packed) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 684 | return 1; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 685 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 686 | return Types.getTargetData().getABITypeAlignment(Ty); |
| 687 | } |
| 688 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 689 | void CGRecordLayoutBuilder::CheckZeroInitializable(QualType T) { |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 690 | // This record already contains a member pointer. |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 691 | if (!IsZeroInitializable) |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 692 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 693 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 694 | // Can only have member pointers if we're compiling C++. |
| 695 | if (!Types.getContext().getLangOptions().CPlusPlus) |
| 696 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 697 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 698 | T = Types.getContext().getBaseElementType(T); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 699 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 700 | if (const MemberPointerType *MPT = T->getAs<MemberPointerType>()) { |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 701 | if (!Types.getCXXABI().isZeroInitializable(MPT)) |
| 702 | IsZeroInitializable = false; |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 703 | } else if (const RecordType *RT = T->getAs<RecordType>()) { |
| 704 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 705 | CheckZeroInitializable(RD); |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 706 | } |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 707 | } |
| 708 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 709 | void CGRecordLayoutBuilder::CheckZeroInitializable(const CXXRecordDecl *RD) { |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 710 | // This record already contains a member pointer. |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 711 | if (!IsZeroInitializable) |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 712 | return; |
| 713 | |
Anders Carlsson | 3379e9b | 2010-11-24 19:57:04 +0000 | [diff] [blame^] | 714 | const CGRecordLayout &Layout = Types.getCGRecordLayout(RD); |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 715 | if (!Layout.isZeroInitializable()) |
| 716 | IsZeroInitializable = false; |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 717 | } |
| 718 | |
Daniel Dunbar | 270e203 | 2010-03-31 00:11:27 +0000 | [diff] [blame] | 719 | CGRecordLayout *CodeGenTypes::ComputeRecordLayout(const RecordDecl *D) { |
| 720 | CGRecordLayoutBuilder Builder(*this); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 721 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 722 | Builder.Layout(D); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 723 | |
Anders Carlsson | ba2c2ee | 2010-11-24 19:37:16 +0000 | [diff] [blame] | 724 | const llvm::StructType *Ty = llvm::StructType::get(getLLVMContext(), |
| 725 | Builder.FieldTypes, |
| 726 | Builder.Packed); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 727 | |
Anders Carlsson | ba2c2ee | 2010-11-24 19:37:16 +0000 | [diff] [blame] | 728 | const llvm::StructType *BaseTy = 0; |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 729 | if (isa<CXXRecordDecl>(D)) { |
| 730 | if (Builder.NonVirtualBaseTypeIsSameAsCompleteType) |
| 731 | BaseTy = Ty; |
| 732 | else if (!Builder.NonVirtualBaseFieldTypes.empty()) |
| 733 | BaseTy = llvm::StructType::get(getLLVMContext(), |
| 734 | Builder.NonVirtualBaseFieldTypes, |
| 735 | Builder.Packed); |
| 736 | } |
| 737 | |
Daniel Dunbar | 198bcb4 | 2010-03-31 01:09:11 +0000 | [diff] [blame] | 738 | CGRecordLayout *RL = |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 739 | new CGRecordLayout(Ty, BaseTy, Builder.IsZeroInitializable); |
Daniel Dunbar | 198bcb4 | 2010-03-31 01:09:11 +0000 | [diff] [blame] | 740 | |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 741 | // Add all the non-virtual base field numbers. |
| 742 | RL->NonVirtualBaseFields.insert(Builder.LLVMNonVirtualBases.begin(), |
| 743 | Builder.LLVMNonVirtualBases.end()); |
| 744 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 745 | // Add all the field numbers. |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 746 | RL->FieldInfo.insert(Builder.LLVMFields.begin(), |
| 747 | Builder.LLVMFields.end()); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 748 | |
| 749 | // Add bitfield info. |
Anders Carlsson | c6772ce | 2010-05-18 05:22:06 +0000 | [diff] [blame] | 750 | RL->BitFields.insert(Builder.LLVMBitFields.begin(), |
| 751 | Builder.LLVMBitFields.end()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 752 | |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 753 | // Dump the layout, if requested. |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 754 | if (getContext().getLangOptions().DumpRecordLayouts) { |
Daniel Dunbar | 8d8ab74 | 2010-04-19 20:44:53 +0000 | [diff] [blame] | 755 | llvm::errs() << "\n*** Dumping IRgen Record Layout\n"; |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 756 | llvm::errs() << "Record: "; |
| 757 | D->dump(); |
| 758 | llvm::errs() << "\nLayout: "; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 759 | RL->dump(); |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 760 | } |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 761 | |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 762 | #ifndef NDEBUG |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 763 | // Verify that the computed LLVM struct size matches the AST layout size. |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 764 | const ASTRecordLayout &Layout = getContext().getASTRecordLayout(D); |
| 765 | |
| 766 | uint64_t TypeSizeInBits = Layout.getSize(); |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 767 | assert(TypeSizeInBits == getTargetData().getTypeAllocSizeInBits(Ty) && |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 768 | "Type size mismatch!"); |
| 769 | |
Anders Carlsson | 3d155e6 | 2010-11-09 05:25:47 +0000 | [diff] [blame] | 770 | if (BaseTy) { |
| 771 | uint64_t AlignedNonVirtualTypeSizeInBits = |
| 772 | llvm::RoundUpToAlignment(Layout.getNonVirtualSize(), |
| 773 | Layout.getNonVirtualAlign()); |
| 774 | |
| 775 | assert(AlignedNonVirtualTypeSizeInBits == |
| 776 | getTargetData().getTypeAllocSizeInBits(BaseTy) && |
| 777 | "Type size mismatch!"); |
| 778 | } |
| 779 | |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 780 | // Verify that the LLVM and AST field offsets agree. |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 781 | const llvm::StructType *ST = |
| 782 | dyn_cast<llvm::StructType>(RL->getLLVMType()); |
| 783 | const llvm::StructLayout *SL = getTargetData().getStructLayout(ST); |
| 784 | |
| 785 | const ASTRecordLayout &AST_RL = getContext().getASTRecordLayout(D); |
| 786 | RecordDecl::field_iterator it = D->field_begin(); |
| 787 | for (unsigned i = 0, e = AST_RL.getFieldCount(); i != e; ++i, ++it) { |
| 788 | const FieldDecl *FD = *it; |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 789 | |
| 790 | // For non-bit-fields, just check that the LLVM struct offset matches the |
| 791 | // AST offset. |
| 792 | if (!FD->isBitField()) { |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 793 | unsigned FieldNo = RL->getLLVMFieldNo(FD); |
| 794 | assert(AST_RL.getFieldOffset(i) == SL->getElementOffsetInBits(FieldNo) && |
| 795 | "Invalid field offset!"); |
Daniel Dunbar | e1467a4 | 2010-04-22 02:35:46 +0000 | [diff] [blame] | 796 | continue; |
| 797 | } |
| 798 | |
| 799 | // Ignore unnamed bit-fields. |
| 800 | if (!FD->getDeclName()) |
| 801 | continue; |
| 802 | |
| 803 | const CGBitFieldInfo &Info = RL->getBitFieldInfo(FD); |
| 804 | for (unsigned i = 0, e = Info.getNumComponents(); i != e; ++i) { |
| 805 | const CGBitFieldInfo::AccessInfo &AI = Info.getComponent(i); |
| 806 | |
| 807 | // Verify that every component access is within the structure. |
| 808 | uint64_t FieldOffset = SL->getElementOffsetInBits(AI.FieldIndex); |
| 809 | uint64_t AccessBitOffset = FieldOffset + AI.FieldByteOffset * 8; |
| 810 | assert(AccessBitOffset + AI.AccessWidth <= TypeSizeInBits && |
| 811 | "Invalid bit-field access (out of range)!"); |
Daniel Dunbar | 3b2ae7a | 2010-04-21 19:10:49 +0000 | [diff] [blame] | 812 | } |
| 813 | } |
| 814 | #endif |
Daniel Dunbar | 2e7b7c2 | 2010-04-19 20:44:47 +0000 | [diff] [blame] | 815 | |
Daniel Dunbar | 198bcb4 | 2010-03-31 01:09:11 +0000 | [diff] [blame] | 816 | return RL; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 817 | } |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 818 | |
| 819 | void CGRecordLayout::print(llvm::raw_ostream &OS) const { |
| 820 | OS << "<CGRecordLayout\n"; |
| 821 | OS << " LLVMType:" << *LLVMType << "\n"; |
Anders Carlsson | 9a5a3f2 | 2010-11-21 23:59:45 +0000 | [diff] [blame] | 822 | if (NonVirtualBaseLLVMType) |
| 823 | OS << " NonVirtualBaseLLVMType:" << *NonVirtualBaseLLVMType << "\n"; |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 824 | OS << " IsZeroInitializable:" << IsZeroInitializable << "\n"; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 825 | OS << " BitFields:[\n"; |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 826 | |
| 827 | // Print bit-field infos in declaration order. |
| 828 | std::vector<std::pair<unsigned, const CGBitFieldInfo*> > BFIs; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 829 | for (llvm::DenseMap<const FieldDecl*, CGBitFieldInfo>::const_iterator |
| 830 | it = BitFields.begin(), ie = BitFields.end(); |
| 831 | it != ie; ++it) { |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 832 | const RecordDecl *RD = it->first->getParent(); |
| 833 | unsigned Index = 0; |
| 834 | for (RecordDecl::field_iterator |
| 835 | it2 = RD->field_begin(); *it2 != it->first; ++it2) |
| 836 | ++Index; |
| 837 | BFIs.push_back(std::make_pair(Index, &it->second)); |
| 838 | } |
| 839 | llvm::array_pod_sort(BFIs.begin(), BFIs.end()); |
| 840 | for (unsigned i = 0, e = BFIs.size(); i != e; ++i) { |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 841 | OS.indent(4); |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 842 | BFIs[i].second->print(OS); |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 843 | OS << "\n"; |
| 844 | } |
Daniel Dunbar | ad75953 | 2010-04-22 02:35:36 +0000 | [diff] [blame] | 845 | |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 846 | OS << "]>\n"; |
| 847 | } |
| 848 | |
| 849 | void CGRecordLayout::dump() const { |
| 850 | print(llvm::errs()); |
| 851 | } |
| 852 | |
| 853 | void CGBitFieldInfo::print(llvm::raw_ostream &OS) const { |
| 854 | OS << "<CGBitFieldInfo"; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 855 | OS << " Size:" << Size; |
Daniel Dunbar | ab970f9 | 2010-04-13 20:58:55 +0000 | [diff] [blame] | 856 | OS << " IsSigned:" << IsSigned << "\n"; |
| 857 | |
| 858 | OS.indent(4 + strlen("<CGBitFieldInfo")); |
| 859 | OS << " NumComponents:" << getNumComponents(); |
| 860 | OS << " Components: ["; |
| 861 | if (getNumComponents()) { |
| 862 | OS << "\n"; |
| 863 | for (unsigned i = 0, e = getNumComponents(); i != e; ++i) { |
| 864 | const AccessInfo &AI = getComponent(i); |
| 865 | OS.indent(8); |
| 866 | OS << "<AccessInfo" |
| 867 | << " FieldIndex:" << AI.FieldIndex |
| 868 | << " FieldByteOffset:" << AI.FieldByteOffset |
| 869 | << " FieldBitStart:" << AI.FieldBitStart |
| 870 | << " AccessWidth:" << AI.AccessWidth << "\n"; |
| 871 | OS.indent(8 + strlen("<AccessInfo")); |
| 872 | OS << " AccessAlignment:" << AI.AccessAlignment |
| 873 | << " TargetBitOffset:" << AI.TargetBitOffset |
| 874 | << " TargetBitWidth:" << AI.TargetBitWidth |
| 875 | << ">\n"; |
| 876 | } |
| 877 | OS.indent(4); |
| 878 | } |
| 879 | OS << "]>"; |
Daniel Dunbar | 93c6296 | 2010-04-12 18:14:18 +0000 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | void CGBitFieldInfo::dump() const { |
| 883 | print(llvm::errs()); |
| 884 | } |