Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 1 | //===--- CGRecordLayoutBuilder.cpp - Record builder helper ------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This is a helper class used to build CGRecordLayout objects and LLVM types. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CGRecordLayoutBuilder.h" |
| 15 | |
| 16 | #include "clang/AST/ASTContext.h" |
| 17 | #include "clang/AST/Attr.h" |
| 18 | #include "clang/AST/DeclCXX.h" |
| 19 | #include "clang/AST/Expr.h" |
| 20 | #include "clang/AST/RecordLayout.h" |
| 21 | #include "CodeGenTypes.h" |
| 22 | #include "llvm/DerivedTypes.h" |
| 23 | #include "llvm/Target/TargetData.h" |
| 24 | |
| 25 | |
| 26 | using namespace clang; |
| 27 | using namespace CodeGen; |
| 28 | |
| 29 | void CGRecordLayoutBuilder::Layout(const RecordDecl *D) { |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 30 | Alignment = Types.getContext().getASTRecordLayout(D).getAlignment() / 8; |
Anders Carlsson | d0eb3b9 | 2009-09-02 17:51:33 +0000 | [diff] [blame] | 31 | Packed = D->hasAttr<PackedAttr>(); |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 32 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 33 | if (D->isUnion()) { |
| 34 | LayoutUnion(D); |
| 35 | return; |
| 36 | } |
Anders Carlsson | a860e75 | 2009-08-08 18:23:56 +0000 | [diff] [blame] | 37 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 38 | if (LayoutFields(D)) |
| 39 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 40 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 41 | // 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] | 42 | Packed = true; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 43 | AlignmentAsLLVMStruct = 1; |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 44 | NextFieldOffsetInBytes = 0; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 45 | FieldTypes.clear(); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 46 | LLVMFields.clear(); |
| 47 | LLVMBitFields.clear(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 48 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 49 | LayoutFields(D); |
| 50 | } |
| 51 | |
| 52 | void CGRecordLayoutBuilder::LayoutBitField(const FieldDecl *D, |
| 53 | uint64_t FieldOffset) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 54 | uint64_t FieldSize = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 55 | D->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 56 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 57 | if (FieldSize == 0) |
| 58 | return; |
| 59 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 60 | uint64_t NextFieldOffset = NextFieldOffsetInBytes * 8; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 61 | unsigned NumBytesToAppend; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 62 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 63 | if (FieldOffset < NextFieldOffset) { |
| 64 | assert(BitsAvailableInLastField && "Bitfield size mismatch!"); |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 65 | assert(NextFieldOffsetInBytes && "Must have laid out at least one byte!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 66 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 67 | // The bitfield begins in the previous bit-field. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 68 | NumBytesToAppend = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 69 | llvm::RoundUpToAlignment(FieldSize - BitsAvailableInLastField, 8) / 8; |
| 70 | } else { |
| 71 | assert(FieldOffset % 8 == 0 && "Field offset not aligned correctly"); |
| 72 | |
| 73 | // Append padding if necessary. |
| 74 | AppendBytes((FieldOffset - NextFieldOffset) / 8); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 75 | |
| 76 | NumBytesToAppend = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 77 | llvm::RoundUpToAlignment(FieldSize, 8) / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 78 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 79 | assert(NumBytesToAppend && "No bytes to append!"); |
| 80 | } |
| 81 | |
| 82 | const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(D->getType()); |
| 83 | uint64_t TypeSizeInBits = getTypeSizeInBytes(Ty) * 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 84 | |
Anders Carlsson | 8330cee | 2009-07-23 17:01:21 +0000 | [diff] [blame] | 85 | LLVMBitFields.push_back(LLVMBitFieldInfo(D, FieldOffset / TypeSizeInBits, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 86 | FieldOffset % TypeSizeInBits, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 87 | FieldSize)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 88 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 89 | AppendBytes(NumBytesToAppend); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 90 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 91 | BitsAvailableInLastField = |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 92 | NextFieldOffsetInBytes * 8 - (FieldOffset + FieldSize); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D, |
| 96 | uint64_t FieldOffset) { |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 97 | // If the field is packed, then we need a packed struct. |
Anders Carlsson | a860e75 | 2009-08-08 18:23:56 +0000 | [diff] [blame] | 98 | if (!Packed && D->hasAttr<PackedAttr>()) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 99 | return false; |
| 100 | |
| 101 | if (D->isBitField()) { |
| 102 | // We must use packed structs for unnamed bit fields since they |
| 103 | // don't affect the struct alignment. |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 104 | if (!Packed && !D->getDeclName()) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 105 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 106 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 107 | LayoutBitField(D, FieldOffset); |
| 108 | return true; |
| 109 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 110 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 111 | assert(FieldOffset % 8 == 0 && "FieldOffset is not on a byte boundary!"); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 112 | uint64_t FieldOffsetInBytes = FieldOffset / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 113 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 114 | const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(D->getType()); |
| 115 | unsigned TypeAlignment = getTypeAlignment(Ty); |
| 116 | |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 117 | // If the type alignment is larger then the struct alignment, we must use |
| 118 | // a packed struct. |
| 119 | if (TypeAlignment > Alignment) { |
| 120 | assert(!Packed && "Alignment is wrong even with packed struct!"); |
| 121 | return false; |
| 122 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 123 | |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 124 | if (const RecordType *RT = D->getType()->getAs<RecordType>()) { |
| 125 | const RecordDecl *RD = cast<RecordDecl>(RT->getDecl()); |
| 126 | if (const PragmaPackAttr *PPA = RD->getAttr<PragmaPackAttr>()) { |
| 127 | if (PPA->getAlignment() != TypeAlignment * 8 && !Packed) |
| 128 | return false; |
| 129 | } |
| 130 | } |
| 131 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 132 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 133 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 134 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, TypeAlignment); |
| 135 | |
| 136 | if (FieldOffsetInBytes < AlignedNextFieldOffsetInBytes) { |
| 137 | assert(!Packed && "Could not place field even with packed struct!"); |
| 138 | return false; |
| 139 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 140 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 141 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 142 | // Even with alignment, the field offset is not at the right place, |
| 143 | // insert padding. |
| 144 | uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 145 | |
Anders Carlsson | de9f2c9 | 2009-08-04 16:29:15 +0000 | [diff] [blame] | 146 | AppendBytes(PaddingInBytes); |
| 147 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 148 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 149 | // Now append the field. |
| 150 | LLVMFields.push_back(LLVMFieldInfo(D, FieldTypes.size())); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 151 | AppendField(FieldOffsetInBytes, Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 152 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 153 | return true; |
| 154 | } |
| 155 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 156 | void CGRecordLayoutBuilder::LayoutUnion(const RecordDecl *D) { |
| 157 | assert(D->isUnion() && "Can't call LayoutUnion on a non-union record!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 158 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 159 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 160 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 161 | const llvm::Type *Ty = 0; |
| 162 | uint64_t Size = 0; |
| 163 | unsigned Align = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 164 | |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 165 | bool HasOnlyZeroSizedBitFields = true; |
| 166 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 167 | unsigned FieldNo = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 168 | for (RecordDecl::field_iterator Field = D->field_begin(), |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 169 | FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 170 | assert(Layout.getFieldOffset(FieldNo) == 0 && |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 171 | "Union field offset did not start at the beginning of record!"); |
Anders Carlsson | 2cc8f17 | 2009-07-23 04:00:39 +0000 | [diff] [blame] | 172 | |
| 173 | if (Field->isBitField()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 174 | uint64_t FieldSize = |
Anders Carlsson | 2cc8f17 | 2009-07-23 04:00:39 +0000 | [diff] [blame] | 175 | Field->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 176 | |
Anders Carlsson | 2cc8f17 | 2009-07-23 04:00:39 +0000 | [diff] [blame] | 177 | // Ignore zero sized bit fields. |
| 178 | if (FieldSize == 0) |
| 179 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 180 | |
Anders Carlsson | 94ae95f | 2009-07-23 22:52:34 +0000 | [diff] [blame] | 181 | // Add the bit field info. |
| 182 | Types.addBitFieldInfo(*Field, 0, 0, FieldSize); |
| 183 | } else |
| 184 | Types.addFieldInfo(*Field, 0); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 185 | |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 186 | HasOnlyZeroSizedBitFields = false; |
| 187 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 188 | const llvm::Type *FieldTy = |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 189 | Types.ConvertTypeForMemRecursive(Field->getType()); |
Anders Carlsson | 177d4d8 | 2009-07-23 21:52:03 +0000 | [diff] [blame] | 190 | unsigned FieldAlign = Types.getTargetData().getABITypeAlignment(FieldTy); |
| 191 | uint64_t FieldSize = Types.getTargetData().getTypeAllocSize(FieldTy); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 192 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 193 | if (FieldAlign < Align) |
| 194 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 195 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 196 | if (FieldAlign > Align || FieldSize > Size) { |
| 197 | Ty = FieldTy; |
| 198 | Align = FieldAlign; |
| 199 | Size = FieldSize; |
| 200 | } |
| 201 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 202 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 203 | // Now add our field. |
Anders Carlsson | 3662000 | 2009-09-03 22:56:02 +0000 | [diff] [blame] | 204 | if (Ty) { |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 205 | AppendField(0, Ty); |
Anders Carlsson | 3662000 | 2009-09-03 22:56:02 +0000 | [diff] [blame] | 206 | |
| 207 | if (getTypeAlignment(Ty) > Layout.getAlignment() / 8) { |
| 208 | // We need a packed struct. |
| 209 | Packed = true; |
| 210 | Align = 1; |
| 211 | } |
| 212 | } |
Fariborz Jahanian | e504170 | 2009-11-06 20:47:40 +0000 | [diff] [blame] | 213 | if (!Align) { |
Anders Carlsson | 21fd7d7 | 2010-01-28 18:22:03 +0000 | [diff] [blame] | 214 | assert(HasOnlyZeroSizedBitFields && |
| 215 | "0-align record did not have all zero-sized bit-fields!"); |
Fariborz Jahanian | e504170 | 2009-11-06 20:47:40 +0000 | [diff] [blame] | 216 | Align = 1; |
| 217 | } |
| 218 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 219 | // Append tail padding. |
| 220 | if (Layout.getSize() / 8 > Size) |
| 221 | AppendPadding(Layout.getSize() / 8, Align); |
| 222 | } |
| 223 | |
Anders Carlsson | 4b3e5be | 2009-12-16 17:27:20 +0000 | [diff] [blame] | 224 | void CGRecordLayoutBuilder::LayoutBases(const CXXRecordDecl *RD, |
| 225 | const ASTRecordLayout &Layout) { |
| 226 | // Check if we need to add a vtable pointer. |
| 227 | if (RD->isDynamicClass() && !Layout.getPrimaryBase()) { |
| 228 | const llvm::Type *Int8PtrTy = |
| 229 | llvm::Type::getInt8PtrTy(Types.getLLVMContext()); |
| 230 | |
| 231 | assert(NextFieldOffsetInBytes == 0 && |
| 232 | "Vtable pointer must come first!"); |
| 233 | AppendField(NextFieldOffsetInBytes, Int8PtrTy->getPointerTo()); |
| 234 | } |
| 235 | } |
| 236 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 237 | bool CGRecordLayoutBuilder::LayoutFields(const RecordDecl *D) { |
| 238 | assert(!D->isUnion() && "Can't call LayoutFields on a union!"); |
Anders Carlsson | a5dd722 | 2009-08-08 19:38:24 +0000 | [diff] [blame] | 239 | assert(Alignment && "Did not set alignment!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 240 | |
Anders Carlsson | 5a6e398 | 2009-07-23 03:43:54 +0000 | [diff] [blame] | 241 | const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 242 | |
Anders Carlsson | 4b3e5be | 2009-12-16 17:27:20 +0000 | [diff] [blame] | 243 | if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) |
| 244 | LayoutBases(RD, Layout); |
| 245 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 246 | unsigned FieldNo = 0; |
Fariborz Jahanian | cad8665 | 2009-07-27 20:57:45 +0000 | [diff] [blame] | 247 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 248 | for (RecordDecl::field_iterator Field = D->field_begin(), |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 249 | FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
| 250 | if (!LayoutField(*Field, Layout.getFieldOffset(FieldNo))) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 251 | assert(!Packed && |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 252 | "Could not layout fields even with a packed LLVM struct!"); |
| 253 | return false; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | // Append tail padding if necessary. |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 258 | AppendTailPadding(Layout.getSize()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 259 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 260 | return true; |
| 261 | } |
| 262 | |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 263 | void CGRecordLayoutBuilder::AppendTailPadding(uint64_t RecordSize) { |
| 264 | assert(RecordSize % 8 == 0 && "Invalid record size!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 265 | |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 266 | uint64_t RecordSizeInBytes = RecordSize / 8; |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 267 | assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 268 | |
Anders Carlsson | c245682 | 2009-12-08 01:24:23 +0000 | [diff] [blame] | 269 | uint64_t AlignedNextFieldOffset = |
| 270 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, AlignmentAsLLVMStruct); |
| 271 | |
| 272 | if (AlignedNextFieldOffset == RecordSizeInBytes) { |
| 273 | // We don't need any padding. |
| 274 | return; |
| 275 | } |
| 276 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 277 | unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes; |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 278 | AppendBytes(NumPadBytes); |
| 279 | } |
| 280 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 281 | void CGRecordLayoutBuilder::AppendField(uint64_t FieldOffsetInBytes, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 282 | const llvm::Type *FieldTy) { |
| 283 | AlignmentAsLLVMStruct = std::max(AlignmentAsLLVMStruct, |
| 284 | getTypeAlignment(FieldTy)); |
Anders Carlsson | 728d7cd | 2009-07-24 02:45:50 +0000 | [diff] [blame] | 285 | |
| 286 | uint64_t FieldSizeInBytes = getTypeSizeInBytes(FieldTy); |
| 287 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 288 | FieldTypes.push_back(FieldTy); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 289 | |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 290 | NextFieldOffsetInBytes = FieldOffsetInBytes + FieldSizeInBytes; |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 291 | BitsAvailableInLastField = 0; |
| 292 | } |
| 293 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 294 | void |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 295 | CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes, |
| 296 | const llvm::Type *FieldTy) { |
| 297 | AppendPadding(FieldOffsetInBytes, getTypeAlignment(FieldTy)); |
| 298 | } |
| 299 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 300 | void CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes, |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 301 | unsigned FieldAlignment) { |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 302 | assert(NextFieldOffsetInBytes <= FieldOffsetInBytes && |
| 303 | "Incorrect field layout!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 304 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 305 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 306 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 307 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment); |
| 308 | |
| 309 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 310 | // Even with alignment, the field offset is not at the right place, |
| 311 | // insert padding. |
| 312 | uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes; |
| 313 | |
| 314 | AppendBytes(PaddingInBytes); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | void CGRecordLayoutBuilder::AppendBytes(uint64_t NumBytes) { |
| 319 | if (NumBytes == 0) |
| 320 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 321 | |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 322 | const llvm::Type *Ty = llvm::Type::getInt8Ty(Types.getLLVMContext()); |
Anders Carlsson | c1efe36 | 2009-07-27 14:55:54 +0000 | [diff] [blame] | 323 | if (NumBytes > 1) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 324 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 325 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 326 | // Append the padding field |
Anders Carlsson | c2cc1d5 | 2009-07-28 17:56:36 +0000 | [diff] [blame] | 327 | AppendField(NextFieldOffsetInBytes, Ty); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | unsigned CGRecordLayoutBuilder::getTypeAlignment(const llvm::Type *Ty) const { |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 331 | if (Packed) |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 332 | return 1; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 333 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 334 | return Types.getTargetData().getABITypeAlignment(Ty); |
| 335 | } |
| 336 | |
| 337 | uint64_t CGRecordLayoutBuilder::getTypeSizeInBytes(const llvm::Type *Ty) const { |
| 338 | return Types.getTargetData().getTypeAllocSize(Ty); |
| 339 | } |
| 340 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 341 | void CGRecordLayoutBuilder::CheckForMemberPointer(const FieldDecl *FD) { |
| 342 | // This record already contains a member pointer. |
| 343 | if (ContainsMemberPointer) |
| 344 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 345 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 346 | // Can only have member pointers if we're compiling C++. |
| 347 | if (!Types.getContext().getLangOptions().CPlusPlus) |
| 348 | return; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 349 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 350 | QualType Ty = FD->getType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 351 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 352 | if (Ty->isMemberPointerType()) { |
| 353 | // We have a member pointer! |
| 354 | ContainsMemberPointer = true; |
| 355 | return; |
| 356 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 357 | |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 358 | } |
| 359 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 360 | CGRecordLayout * |
| 361 | CGRecordLayoutBuilder::ComputeLayout(CodeGenTypes &Types, |
| 362 | const RecordDecl *D) { |
| 363 | CGRecordLayoutBuilder Builder(Types); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 364 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 365 | Builder.Layout(D); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 366 | |
Owen Anderson | 47a434f | 2009-08-05 23:18:46 +0000 | [diff] [blame] | 367 | const llvm::Type *Ty = llvm::StructType::get(Types.getLLVMContext(), |
| 368 | Builder.FieldTypes, |
Anders Carlsson | 4b5584b | 2009-07-23 17:24:40 +0000 | [diff] [blame] | 369 | Builder.Packed); |
Anders Carlsson | df31e09 | 2009-08-08 18:01:57 +0000 | [diff] [blame] | 370 | assert(Types.getContext().getASTRecordLayout(D).getSize() / 8 == |
| 371 | Types.getTargetData().getTypeAllocSize(Ty) && |
| 372 | "Type size mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 373 | |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 374 | // Add all the field numbers. |
| 375 | for (unsigned i = 0, e = Builder.LLVMFields.size(); i != e; ++i) { |
| 376 | const FieldDecl *FD = Builder.LLVMFields[i].first; |
| 377 | unsigned FieldNo = Builder.LLVMFields[i].second; |
| 378 | |
| 379 | Types.addFieldInfo(FD, FieldNo); |
| 380 | } |
| 381 | |
| 382 | // Add bitfield info. |
| 383 | for (unsigned i = 0, e = Builder.LLVMBitFields.size(); i != e; ++i) { |
| 384 | const LLVMBitFieldInfo &Info = Builder.LLVMBitFields[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 385 | |
Anders Carlsson | 8330cee | 2009-07-23 17:01:21 +0000 | [diff] [blame] | 386 | Types.addBitFieldInfo(Info.FD, Info.FieldNo, Info.Start, Info.Size); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 387 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 388 | |
Anders Carlsson | 1a5e0d7 | 2009-11-30 23:41:22 +0000 | [diff] [blame] | 389 | return new CGRecordLayout(Ty, Builder.ContainsMemberPointer); |
Anders Carlsson | 45372a6 | 2009-07-23 03:17:50 +0000 | [diff] [blame] | 390 | } |