Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 1 | //===--- CGExprConstant.cpp - Emit LLVM Code from Constant Expressions ----===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This contains code to emit Constant Expr nodes as LLVM code. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
| 15 | #include "CodeGenModule.h" |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame] | 16 | #include "CGObjCRuntime.h" |
Daniel Dunbar | 2924ade | 2010-03-30 22:26:10 +0000 | [diff] [blame] | 17 | #include "CGRecordLayout.h" |
Chris Lattner | f6b24ea | 2008-10-06 05:59:01 +0000 | [diff] [blame] | 18 | #include "clang/AST/APValue.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 19 | #include "clang/AST/ASTContext.h" |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 20 | #include "clang/AST/RecordLayout.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 21 | #include "clang/AST/StmtVisitor.h" |
Chris Lattner | 1b63e4f | 2009-06-14 01:54:56 +0000 | [diff] [blame] | 22 | #include "clang/Basic/Builtins.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 23 | #include "llvm/Constants.h" |
| 24 | #include "llvm/Function.h" |
| 25 | #include "llvm/GlobalVariable.h" |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 26 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 27 | using namespace clang; |
| 28 | using namespace CodeGen; |
| 29 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 30 | //===----------------------------------------------------------------------===// |
| 31 | // ConstStructBuilder |
| 32 | //===----------------------------------------------------------------------===// |
| 33 | |
| 34 | namespace { |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 35 | class ConstStructBuilder { |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 36 | CodeGenModule &CGM; |
| 37 | CodeGenFunction *CGF; |
| 38 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 39 | bool Packed; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 40 | unsigned NextFieldOffsetInBytes; |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 41 | unsigned LLVMStructAlignment; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 42 | std::vector<llvm::Constant *> Elements; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 43 | public: |
| 44 | static llvm::Constant *BuildStruct(CodeGenModule &CGM, CodeGenFunction *CGF, |
| 45 | InitListExpr *ILE); |
| 46 | |
| 47 | private: |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 48 | ConstStructBuilder(CodeGenModule &CGM, CodeGenFunction *CGF) |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 49 | : CGM(CGM), CGF(CGF), Packed(false), NextFieldOffsetInBytes(0), |
| 50 | LLVMStructAlignment(1) { } |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 51 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 52 | bool AppendField(const FieldDecl *Field, uint64_t FieldOffset, |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 53 | llvm::Constant *InitExpr); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 54 | |
| 55 | bool AppendBitField(const FieldDecl *Field, uint64_t FieldOffset, |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 56 | llvm::Constant *InitExpr); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 57 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 58 | void AppendPadding(uint64_t NumBytes); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 59 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 60 | void AppendTailPadding(uint64_t RecordSize); |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 61 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 62 | void ConvertStructToPacked(); |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 63 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 64 | bool Build(InitListExpr *ILE); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 65 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 66 | unsigned getAlignment(const llvm::Constant *C) const { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 67 | if (Packed) return 1; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 68 | return CGM.getTargetData().getABITypeAlignment(C->getType()); |
| 69 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 70 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 71 | uint64_t getSizeInBytes(const llvm::Constant *C) const { |
| 72 | return CGM.getTargetData().getTypeAllocSize(C->getType()); |
| 73 | } |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 74 | }; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 75 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 76 | bool ConstStructBuilder:: |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 77 | AppendField(const FieldDecl *Field, uint64_t FieldOffset, |
| 78 | llvm::Constant *InitCst) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 79 | uint64_t FieldOffsetInBytes = FieldOffset / 8; |
| 80 | |
| 81 | assert(NextFieldOffsetInBytes <= FieldOffsetInBytes |
| 82 | && "Field offset mismatch!"); |
| 83 | |
| 84 | // Emit the field. |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 85 | if (!InitCst) |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 86 | return false; |
| 87 | |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 88 | unsigned FieldAlignment = getAlignment(InitCst); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 89 | |
| 90 | // Round up the field offset to the alignment of the field type. |
| 91 | uint64_t AlignedNextFieldOffsetInBytes = |
| 92 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment); |
| 93 | |
| 94 | if (AlignedNextFieldOffsetInBytes > FieldOffsetInBytes) { |
| 95 | assert(!Packed && "Alignment is wrong even with a packed struct!"); |
| 96 | |
| 97 | // Convert the struct to a packed struct. |
| 98 | ConvertStructToPacked(); |
| 99 | |
| 100 | AlignedNextFieldOffsetInBytes = NextFieldOffsetInBytes; |
| 101 | } |
| 102 | |
| 103 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 104 | // We need to append padding. |
| 105 | AppendPadding(FieldOffsetInBytes - NextFieldOffsetInBytes); |
| 106 | |
| 107 | assert(NextFieldOffsetInBytes == FieldOffsetInBytes && |
| 108 | "Did not add enough padding!"); |
| 109 | |
| 110 | AlignedNextFieldOffsetInBytes = NextFieldOffsetInBytes; |
| 111 | } |
| 112 | |
| 113 | // Add the field. |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 114 | Elements.push_back(InitCst); |
| 115 | NextFieldOffsetInBytes = AlignedNextFieldOffsetInBytes + |
| 116 | getSizeInBytes(InitCst); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 117 | |
| 118 | if (Packed) |
| 119 | assert(LLVMStructAlignment == 1 && "Packed struct not byte-aligned!"); |
| 120 | else |
| 121 | LLVMStructAlignment = std::max(LLVMStructAlignment, FieldAlignment); |
| 122 | |
| 123 | return true; |
| 124 | } |
| 125 | |
| 126 | bool ConstStructBuilder:: |
| 127 | AppendBitField(const FieldDecl *Field, uint64_t FieldOffset, |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 128 | llvm::Constant *InitCst) { |
| 129 | llvm::ConstantInt *CI = cast_or_null<llvm::ConstantInt>(InitCst); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 130 | // FIXME: Can this ever happen? |
| 131 | if (!CI) |
| 132 | return false; |
| 133 | |
| 134 | if (FieldOffset > NextFieldOffsetInBytes * 8) { |
| 135 | // We need to add padding. |
| 136 | uint64_t NumBytes = |
| 137 | llvm::RoundUpToAlignment(FieldOffset - |
| 138 | NextFieldOffsetInBytes * 8, 8) / 8; |
| 139 | |
| 140 | AppendPadding(NumBytes); |
| 141 | } |
| 142 | |
| 143 | uint64_t FieldSize = |
| 144 | Field->getBitWidth()->EvaluateAsInt(CGM.getContext()).getZExtValue(); |
| 145 | |
| 146 | llvm::APInt FieldValue = CI->getValue(); |
| 147 | |
| 148 | // Promote the size of FieldValue if necessary |
| 149 | // FIXME: This should never occur, but currently it can because initializer |
| 150 | // constants are cast to bool, and because clang is not enforcing bitfield |
| 151 | // width limits. |
| 152 | if (FieldSize > FieldValue.getBitWidth()) |
| 153 | FieldValue.zext(FieldSize); |
| 154 | |
| 155 | // Truncate the size of FieldValue to the bit field size. |
| 156 | if (FieldSize < FieldValue.getBitWidth()) |
| 157 | FieldValue.trunc(FieldSize); |
| 158 | |
| 159 | if (FieldOffset < NextFieldOffsetInBytes * 8) { |
| 160 | // Either part of the field or the entire field can go into the previous |
| 161 | // byte. |
| 162 | assert(!Elements.empty() && "Elements can't be empty!"); |
| 163 | |
| 164 | unsigned BitsInPreviousByte = |
| 165 | NextFieldOffsetInBytes * 8 - FieldOffset; |
| 166 | |
| 167 | bool FitsCompletelyInPreviousByte = |
| 168 | BitsInPreviousByte >= FieldValue.getBitWidth(); |
| 169 | |
| 170 | llvm::APInt Tmp = FieldValue; |
| 171 | |
| 172 | if (!FitsCompletelyInPreviousByte) { |
| 173 | unsigned NewFieldWidth = FieldSize - BitsInPreviousByte; |
| 174 | |
| 175 | if (CGM.getTargetData().isBigEndian()) { |
| 176 | Tmp = Tmp.lshr(NewFieldWidth); |
| 177 | Tmp.trunc(BitsInPreviousByte); |
| 178 | |
| 179 | // We want the remaining high bits. |
| 180 | FieldValue.trunc(NewFieldWidth); |
| 181 | } else { |
| 182 | Tmp.trunc(BitsInPreviousByte); |
| 183 | |
| 184 | // We want the remaining low bits. |
| 185 | FieldValue = FieldValue.lshr(BitsInPreviousByte); |
| 186 | FieldValue.trunc(NewFieldWidth); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | Tmp.zext(8); |
| 191 | if (CGM.getTargetData().isBigEndian()) { |
| 192 | if (FitsCompletelyInPreviousByte) |
| 193 | Tmp = Tmp.shl(BitsInPreviousByte - FieldValue.getBitWidth()); |
| 194 | } else { |
| 195 | Tmp = Tmp.shl(8 - BitsInPreviousByte); |
| 196 | } |
| 197 | |
| 198 | // Or in the bits that go into the previous byte. |
| 199 | if (llvm::ConstantInt *Val = dyn_cast<llvm::ConstantInt>(Elements.back())) |
| 200 | Tmp |= Val->getValue(); |
| 201 | else |
| 202 | assert(isa<llvm::UndefValue>(Elements.back())); |
| 203 | |
| 204 | Elements.back() = llvm::ConstantInt::get(CGM.getLLVMContext(), Tmp); |
| 205 | |
| 206 | if (FitsCompletelyInPreviousByte) |
| 207 | return true; |
| 208 | } |
| 209 | |
| 210 | while (FieldValue.getBitWidth() > 8) { |
| 211 | llvm::APInt Tmp; |
| 212 | |
| 213 | if (CGM.getTargetData().isBigEndian()) { |
| 214 | // We want the high bits. |
| 215 | Tmp = FieldValue; |
| 216 | Tmp = Tmp.lshr(Tmp.getBitWidth() - 8); |
| 217 | Tmp.trunc(8); |
| 218 | } else { |
| 219 | // We want the low bits. |
| 220 | Tmp = FieldValue; |
| 221 | Tmp.trunc(8); |
| 222 | |
| 223 | FieldValue = FieldValue.lshr(8); |
| 224 | } |
| 225 | |
| 226 | Elements.push_back(llvm::ConstantInt::get(CGM.getLLVMContext(), Tmp)); |
| 227 | NextFieldOffsetInBytes++; |
| 228 | |
| 229 | FieldValue.trunc(FieldValue.getBitWidth() - 8); |
| 230 | } |
| 231 | |
| 232 | assert(FieldValue.getBitWidth() > 0 && |
| 233 | "Should have at least one bit left!"); |
| 234 | assert(FieldValue.getBitWidth() <= 8 && |
| 235 | "Should not have more than a byte left!"); |
| 236 | |
| 237 | if (FieldValue.getBitWidth() < 8) { |
| 238 | if (CGM.getTargetData().isBigEndian()) { |
| 239 | unsigned BitWidth = FieldValue.getBitWidth(); |
| 240 | |
| 241 | FieldValue.zext(8); |
| 242 | FieldValue = FieldValue << (8 - BitWidth); |
| 243 | } else |
| 244 | FieldValue.zext(8); |
| 245 | } |
| 246 | |
| 247 | // Append the last element. |
| 248 | Elements.push_back(llvm::ConstantInt::get(CGM.getLLVMContext(), |
| 249 | FieldValue)); |
| 250 | NextFieldOffsetInBytes++; |
| 251 | return true; |
| 252 | } |
| 253 | |
| 254 | void ConstStructBuilder::AppendPadding(uint64_t NumBytes) { |
| 255 | if (!NumBytes) |
| 256 | return; |
| 257 | |
| 258 | const llvm::Type *Ty = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
| 259 | if (NumBytes > 1) |
| 260 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
| 261 | |
Nuno Lopes | cdb30b4 | 2010-04-16 20:56:35 +0000 | [diff] [blame] | 262 | llvm::Constant *C = llvm::UndefValue::get(Ty); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 263 | Elements.push_back(C); |
| 264 | assert(getAlignment(C) == 1 && "Padding must have 1 byte alignment!"); |
| 265 | |
| 266 | NextFieldOffsetInBytes += getSizeInBytes(C); |
| 267 | } |
| 268 | |
| 269 | void ConstStructBuilder::AppendTailPadding(uint64_t RecordSize) { |
| 270 | assert(RecordSize % 8 == 0 && "Invalid record size!"); |
| 271 | |
| 272 | uint64_t RecordSizeInBytes = RecordSize / 8; |
| 273 | assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!"); |
| 274 | |
| 275 | unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes; |
| 276 | AppendPadding(NumPadBytes); |
| 277 | } |
| 278 | |
| 279 | void ConstStructBuilder::ConvertStructToPacked() { |
| 280 | std::vector<llvm::Constant *> PackedElements; |
| 281 | uint64_t ElementOffsetInBytes = 0; |
| 282 | |
| 283 | for (unsigned i = 0, e = Elements.size(); i != e; ++i) { |
| 284 | llvm::Constant *C = Elements[i]; |
| 285 | |
| 286 | unsigned ElementAlign = |
| 287 | CGM.getTargetData().getABITypeAlignment(C->getType()); |
| 288 | uint64_t AlignedElementOffsetInBytes = |
| 289 | llvm::RoundUpToAlignment(ElementOffsetInBytes, ElementAlign); |
| 290 | |
| 291 | if (AlignedElementOffsetInBytes > ElementOffsetInBytes) { |
| 292 | // We need some padding. |
| 293 | uint64_t NumBytes = |
| 294 | AlignedElementOffsetInBytes - ElementOffsetInBytes; |
| 295 | |
| 296 | const llvm::Type *Ty = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
| 297 | if (NumBytes > 1) |
| 298 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
| 299 | |
Nuno Lopes | cdb30b4 | 2010-04-16 20:56:35 +0000 | [diff] [blame] | 300 | llvm::Constant *Padding = llvm::UndefValue::get(Ty); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 301 | PackedElements.push_back(Padding); |
| 302 | ElementOffsetInBytes += getSizeInBytes(Padding); |
| 303 | } |
| 304 | |
| 305 | PackedElements.push_back(C); |
| 306 | ElementOffsetInBytes += getSizeInBytes(C); |
| 307 | } |
| 308 | |
| 309 | assert(ElementOffsetInBytes == NextFieldOffsetInBytes && |
| 310 | "Packing the struct changed its size!"); |
| 311 | |
| 312 | Elements = PackedElements; |
| 313 | LLVMStructAlignment = 1; |
| 314 | Packed = true; |
| 315 | } |
| 316 | |
| 317 | bool ConstStructBuilder::Build(InitListExpr *ILE) { |
| 318 | RecordDecl *RD = ILE->getType()->getAs<RecordType>()->getDecl(); |
| 319 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 320 | |
| 321 | unsigned FieldNo = 0; |
| 322 | unsigned ElementNo = 0; |
| 323 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 324 | FieldEnd = RD->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
| 325 | |
| 326 | // If this is a union, skip all the fields that aren't being initialized. |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 327 | if (RD->isUnion() && ILE->getInitializedFieldInUnion() != *Field) |
| 328 | continue; |
| 329 | |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 330 | // Don't emit anonymous bitfields, they just affect layout. |
| 331 | if (Field->isBitField() && !Field->getIdentifier()) |
| 332 | continue; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 333 | |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 334 | // Get the initializer. A struct can include fields without initializers, |
| 335 | // we just use explicit null values for them. |
| 336 | llvm::Constant *EltInit; |
| 337 | if (ElementNo < ILE->getNumInits()) |
| 338 | EltInit = CGM.EmitConstantExpr(ILE->getInit(ElementNo++), |
| 339 | Field->getType(), CGF); |
| 340 | else |
| 341 | EltInit = CGM.EmitNullConstant(Field->getType()); |
| 342 | |
| 343 | if (!Field->isBitField()) { |
| 344 | // Handle non-bitfield members. |
| 345 | if (!AppendField(*Field, Layout.getFieldOffset(FieldNo), EltInit)) |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 346 | return false; |
| 347 | } else { |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 348 | // Otherwise we have a bitfield. |
| 349 | if (!AppendBitField(*Field, Layout.getFieldOffset(FieldNo), EltInit)) |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 350 | return false; |
| 351 | } |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | uint64_t LayoutSizeInBytes = Layout.getSize() / 8; |
| 355 | |
| 356 | if (NextFieldOffsetInBytes > LayoutSizeInBytes) { |
| 357 | // If the struct is bigger than the size of the record type, |
| 358 | // we must have a flexible array member at the end. |
| 359 | assert(RD->hasFlexibleArrayMember() && |
| 360 | "Must have flexible array member if struct is bigger than type!"); |
| 361 | |
| 362 | // No tail padding is necessary. |
| 363 | return true; |
| 364 | } |
| 365 | |
| 366 | uint64_t LLVMSizeInBytes = llvm::RoundUpToAlignment(NextFieldOffsetInBytes, |
| 367 | LLVMStructAlignment); |
| 368 | |
| 369 | // Check if we need to convert the struct to a packed struct. |
| 370 | if (NextFieldOffsetInBytes <= LayoutSizeInBytes && |
| 371 | LLVMSizeInBytes > LayoutSizeInBytes) { |
| 372 | assert(!Packed && "Size mismatch!"); |
| 373 | |
| 374 | ConvertStructToPacked(); |
Chris Lattner | d39a0d6 | 2010-04-16 21:02:32 +0000 | [diff] [blame] | 375 | assert(NextFieldOffsetInBytes <= LayoutSizeInBytes && |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 376 | "Converting to packed did not help!"); |
| 377 | } |
| 378 | |
| 379 | // Append tail padding if necessary. |
| 380 | AppendTailPadding(Layout.getSize()); |
| 381 | |
| 382 | assert(Layout.getSize() / 8 == NextFieldOffsetInBytes && |
| 383 | "Tail padding mismatch!"); |
| 384 | |
| 385 | return true; |
| 386 | } |
| 387 | |
| 388 | llvm::Constant *ConstStructBuilder:: |
| 389 | BuildStruct(CodeGenModule &CGM, CodeGenFunction *CGF, InitListExpr *ILE) { |
| 390 | ConstStructBuilder Builder(CGM, CGF); |
| 391 | |
| 392 | if (!Builder.Build(ILE)) |
| 393 | return 0; |
| 394 | |
| 395 | llvm::Constant *Result = |
| 396 | llvm::ConstantStruct::get(CGM.getLLVMContext(), |
| 397 | Builder.Elements, Builder.Packed); |
| 398 | |
| 399 | assert(llvm::RoundUpToAlignment(Builder.NextFieldOffsetInBytes, |
| 400 | Builder.getAlignment(Result)) == |
| 401 | Builder.getSizeInBytes(Result) && "Size mismatch!"); |
| 402 | |
| 403 | return Result; |
| 404 | } |
| 405 | |
| 406 | |
| 407 | //===----------------------------------------------------------------------===// |
| 408 | // ConstExprEmitter |
| 409 | //===----------------------------------------------------------------------===// |
| 410 | |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 411 | class ConstExprEmitter : |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 412 | public StmtVisitor<ConstExprEmitter, llvm::Constant*> { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 413 | CodeGenModule &CGM; |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 414 | CodeGenFunction *CGF; |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 415 | llvm::LLVMContext &VMContext; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 416 | public: |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 417 | ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 418 | : CGM(cgm), CGF(cgf), VMContext(cgm.getLLVMContext()) { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 419 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 420 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 421 | //===--------------------------------------------------------------------===// |
| 422 | // Visitor Methods |
| 423 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 424 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 425 | llvm::Constant *VisitStmt(Stmt *S) { |
Anders Carlsson | 069880e | 2009-03-03 16:43:34 +0000 | [diff] [blame] | 426 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 427 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 428 | |
| 429 | llvm::Constant *VisitParenExpr(ParenExpr *PE) { |
| 430 | return Visit(PE->getSubExpr()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 431 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 432 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 433 | llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
| 434 | return Visit(E->getInitializer()); |
| 435 | } |
Chris Lattner | 3ae9f48 | 2009-10-13 07:14:16 +0000 | [diff] [blame] | 436 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 437 | llvm::Constant *EmitMemberFunctionPointer(CXXMethodDecl *MD) { |
| 438 | assert(MD->isInstance() && "Member function must not be static!"); |
| 439 | |
Anders Carlsson | 7af4ec7 | 2010-01-05 05:04:05 +0000 | [diff] [blame] | 440 | MD = MD->getCanonicalDecl(); |
| 441 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 442 | const llvm::Type *PtrDiffTy = |
| 443 | CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType()); |
| 444 | |
| 445 | llvm::Constant *Values[2]; |
Anders Carlsson | e8a81f7 | 2010-02-04 16:38:05 +0000 | [diff] [blame] | 446 | |
Eli Friedman | c00129a | 2010-05-30 06:03:20 +0000 | [diff] [blame] | 447 | Values[0] = CGM.GetCXXMemberFunctionPointerValue(MD); |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 448 | |
| 449 | // The adjustment will always be 0. |
| 450 | Values[1] = llvm::ConstantInt::get(PtrDiffTy, 0); |
| 451 | |
| 452 | return llvm::ConstantStruct::get(CGM.getLLVMContext(), |
| 453 | Values, 2, /*Packed=*/false); |
| 454 | } |
| 455 | |
| 456 | llvm::Constant *VisitUnaryAddrOf(UnaryOperator *E) { |
| 457 | if (const MemberPointerType *MPT = |
| 458 | E->getType()->getAs<MemberPointerType>()) { |
| 459 | QualType T = MPT->getPointeeType(); |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 460 | DeclRefExpr *DRE = cast<DeclRefExpr>(E->getSubExpr()); |
| 461 | |
| 462 | NamedDecl *ND = DRE->getDecl(); |
| 463 | if (T->isFunctionProtoType()) |
| 464 | return EmitMemberFunctionPointer(cast<CXXMethodDecl>(ND)); |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 465 | |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 466 | // We have a pointer to data member. |
| 467 | return CGM.EmitPointerToDataMember(cast<FieldDecl>(ND)); |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 468 | } |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 469 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 470 | return 0; |
| 471 | } |
| 472 | |
Chris Lattner | 3ae9f48 | 2009-10-13 07:14:16 +0000 | [diff] [blame] | 473 | llvm::Constant *VisitBinSub(BinaryOperator *E) { |
| 474 | // This must be a pointer/pointer subtraction. This only happens for |
| 475 | // address of label. |
| 476 | if (!isa<AddrLabelExpr>(E->getLHS()->IgnoreParenNoopCasts(CGM.getContext())) || |
| 477 | !isa<AddrLabelExpr>(E->getRHS()->IgnoreParenNoopCasts(CGM.getContext()))) |
| 478 | return 0; |
| 479 | |
| 480 | llvm::Constant *LHS = CGM.EmitConstantExpr(E->getLHS(), |
| 481 | E->getLHS()->getType(), CGF); |
| 482 | llvm::Constant *RHS = CGM.EmitConstantExpr(E->getRHS(), |
| 483 | E->getRHS()->getType(), CGF); |
| 484 | |
| 485 | const llvm::Type *ResultType = ConvertType(E->getType()); |
| 486 | LHS = llvm::ConstantExpr::getPtrToInt(LHS, ResultType); |
| 487 | RHS = llvm::ConstantExpr::getPtrToInt(RHS, ResultType); |
| 488 | |
| 489 | // No need to divide by element size, since addr of label is always void*, |
| 490 | // which has size 1 in GNUish. |
| 491 | return llvm::ConstantExpr::getSub(LHS, RHS); |
| 492 | } |
| 493 | |
Argyrios Kyrtzidis | 0835a3c | 2008-08-18 23:01:59 +0000 | [diff] [blame] | 494 | llvm::Constant *VisitCastExpr(CastExpr* E) { |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 495 | switch (E->getCastKind()) { |
| 496 | case CastExpr::CK_ToUnion: { |
| 497 | // GCC cast to union extension |
| 498 | assert(E->getType()->isUnionType() && |
| 499 | "Destination type is not union type!"); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 500 | const llvm::Type *Ty = ConvertType(E->getType()); |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 501 | Expr *SubExpr = E->getSubExpr(); |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 502 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 503 | llvm::Constant *C = |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 504 | CGM.EmitConstantExpr(SubExpr, SubExpr->getType(), CGF); |
| 505 | if (!C) |
| 506 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 507 | |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 508 | // Build a struct with the union sub-element as the first member, |
| 509 | // and padded to the appropriate size |
| 510 | std::vector<llvm::Constant*> Elts; |
| 511 | std::vector<const llvm::Type*> Types; |
| 512 | Elts.push_back(C); |
| 513 | Types.push_back(C->getType()); |
| 514 | unsigned CurSize = CGM.getTargetData().getTypeAllocSize(C->getType()); |
| 515 | unsigned TotalSize = CGM.getTargetData().getTypeAllocSize(Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 516 | |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 517 | assert(CurSize <= TotalSize && "Union size mismatch!"); |
| 518 | if (unsigned NumPadBytes = TotalSize - CurSize) { |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 519 | const llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 520 | if (NumPadBytes > 1) |
| 521 | Ty = llvm::ArrayType::get(Ty, NumPadBytes); |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 522 | |
Nuno Lopes | cdb30b4 | 2010-04-16 20:56:35 +0000 | [diff] [blame] | 523 | Elts.push_back(llvm::UndefValue::get(Ty)); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 524 | Types.push_back(Ty); |
| 525 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 526 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 527 | llvm::StructType* STy = |
| 528 | llvm::StructType::get(C->getType()->getContext(), Types, false); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 529 | return llvm::ConstantStruct::get(STy, Elts); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 530 | } |
Anders Carlsson | d1a9bac | 2009-08-23 00:02:11 +0000 | [diff] [blame] | 531 | case CastExpr::CK_NullToMemberPointer: |
| 532 | return CGM.EmitNullConstant(E->getType()); |
Anders Carlsson | 2c51f09 | 2009-10-03 15:13:22 +0000 | [diff] [blame] | 533 | |
| 534 | case CastExpr::CK_BaseToDerivedMemberPointer: { |
| 535 | Expr *SubExpr = E->getSubExpr(); |
| 536 | |
| 537 | const MemberPointerType *SrcTy = |
| 538 | SubExpr->getType()->getAs<MemberPointerType>(); |
| 539 | const MemberPointerType *DestTy = |
| 540 | E->getType()->getAs<MemberPointerType>(); |
| 541 | |
Anders Carlsson | 2c51f09 | 2009-10-03 15:13:22 +0000 | [diff] [blame] | 542 | const CXXRecordDecl *DerivedClass = |
| 543 | cast<CXXRecordDecl>(cast<RecordType>(DestTy->getClass())->getDecl()); |
| 544 | |
| 545 | if (SrcTy->getPointeeType()->isFunctionProtoType()) { |
| 546 | llvm::Constant *C = |
| 547 | CGM.EmitConstantExpr(SubExpr, SubExpr->getType(), CGF); |
| 548 | if (!C) |
| 549 | return 0; |
| 550 | |
| 551 | llvm::ConstantStruct *CS = cast<llvm::ConstantStruct>(C); |
| 552 | |
| 553 | // Check if we need to update the adjustment. |
Anders Carlsson | bb7e17b | 2010-01-31 01:36:53 +0000 | [diff] [blame] | 554 | if (llvm::Constant *Offset = |
Anders Carlsson | e04d45e | 2010-04-24 21:27:51 +0000 | [diff] [blame] | 555 | CGM.GetNonVirtualBaseClassOffset(DerivedClass, E->getBasePath())) { |
Anders Carlsson | 2c51f09 | 2009-10-03 15:13:22 +0000 | [diff] [blame] | 556 | llvm::Constant *Values[2]; |
| 557 | |
| 558 | Values[0] = CS->getOperand(0); |
| 559 | Values[1] = llvm::ConstantExpr::getAdd(CS->getOperand(1), Offset); |
| 560 | return llvm::ConstantStruct::get(CGM.getLLVMContext(), Values, 2, |
| 561 | /*Packed=*/false); |
| 562 | } |
| 563 | |
| 564 | return CS; |
| 565 | } |
| 566 | } |
Anders Carlsson | bb378cb | 2009-10-18 20:31:03 +0000 | [diff] [blame] | 567 | |
| 568 | case CastExpr::CK_BitCast: |
| 569 | // This must be a member function pointer cast. |
| 570 | return Visit(E->getSubExpr()); |
| 571 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 572 | default: { |
| 573 | // FIXME: This should be handled by the CK_NoOp cast kind. |
| 574 | // Explicit and implicit no-op casts |
| 575 | QualType Ty = E->getType(), SubTy = E->getSubExpr()->getType(); |
| 576 | if (CGM.getContext().hasSameUnqualifiedType(Ty, SubTy)) |
Chris Lattner | 430656e | 2009-10-13 22:12:09 +0000 | [diff] [blame] | 577 | return Visit(E->getSubExpr()); |
| 578 | |
| 579 | // Handle integer->integer casts for address-of-label differences. |
| 580 | if (Ty->isIntegerType() && SubTy->isIntegerType() && |
| 581 | CGF) { |
| 582 | llvm::Value *Src = Visit(E->getSubExpr()); |
| 583 | if (Src == 0) return 0; |
| 584 | |
| 585 | // Use EmitScalarConversion to perform the conversion. |
| 586 | return cast<llvm::Constant>(CGF->EmitScalarConversion(Src, SubTy, Ty)); |
| 587 | } |
| 588 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 589 | return 0; |
Eli Friedman | ddd2b6e | 2009-02-22 07:29:04 +0000 | [diff] [blame] | 590 | } |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 591 | } |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 592 | } |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 593 | |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 594 | llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 595 | return Visit(DAE->getExpr()); |
| 596 | } |
| 597 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 598 | llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) { |
Nuno Lopes | a75b71f | 2010-04-18 19:06:43 +0000 | [diff] [blame] | 599 | unsigned NumInitElements = ILE->getNumInits(); |
| 600 | if (NumInitElements == 1 && |
| 601 | (isa<StringLiteral>(ILE->getInit(0)) || |
| 602 | isa<ObjCEncodeExpr>(ILE->getInit(0)))) |
| 603 | return Visit(ILE->getInit(0)); |
| 604 | |
Nuno Lopes | 6784704 | 2010-04-16 23:19:41 +0000 | [diff] [blame] | 605 | std::vector<llvm::Constant*> Elts; |
| 606 | const llvm::ArrayType *AType = |
| 607 | cast<llvm::ArrayType>(ConvertType(ILE->getType())); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 608 | const llvm::Type *ElemTy = AType->getElementType(); |
| 609 | unsigned NumElements = AType->getNumElements(); |
| 610 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 611 | // Initialising an array requires us to automatically |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 612 | // initialise any elements that have not been initialised explicitly |
| 613 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 614 | |
| 615 | // Copy initializer elements. |
| 616 | unsigned i = 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 617 | bool RewriteType = false; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 618 | for (; i < NumInitableElts; ++i) { |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 619 | Expr *Init = ILE->getInit(i); |
| 620 | llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 621 | if (!C) |
| 622 | return 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 623 | RewriteType |= (C->getType() != ElemTy); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 624 | Elts.push_back(C); |
| 625 | } |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 626 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 627 | // Initialize remaining array elements. |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 628 | // FIXME: This doesn't handle member pointers correctly! |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 629 | for (; i < NumElements; ++i) |
Owen Anderson | c9c88b4 | 2009-07-31 20:28:54 +0000 | [diff] [blame] | 630 | Elts.push_back(llvm::Constant::getNullValue(ElemTy)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 631 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 632 | if (RewriteType) { |
| 633 | // FIXME: Try to avoid packing the array |
| 634 | std::vector<const llvm::Type*> Types; |
| 635 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 636 | Types.push_back(Elts[i]->getType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 637 | const llvm::StructType *SType = llvm::StructType::get(AType->getContext(), |
Owen Anderson | 47a434f | 2009-08-05 23:18:46 +0000 | [diff] [blame] | 638 | Types, true); |
Owen Anderson | 08e2524 | 2009-07-27 22:29:56 +0000 | [diff] [blame] | 639 | return llvm::ConstantStruct::get(SType, Elts); |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 640 | } |
| 641 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 642 | return llvm::ConstantArray::get(AType, Elts); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 643 | } |
| 644 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 645 | llvm::Constant *EmitStructInitialization(InitListExpr *ILE) { |
Anders Carlsson | 8dca3b3 | 2009-07-27 05:54:15 +0000 | [diff] [blame] | 646 | return ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 647 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 648 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 649 | llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) { |
Anders Carlsson | f6c4396 | 2009-07-31 21:34:04 +0000 | [diff] [blame] | 650 | return ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 651 | } |
| 652 | |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 653 | llvm::Constant *VisitImplicitValueInitExpr(ImplicitValueInitExpr* E) { |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 654 | return CGM.EmitNullConstant(E->getType()); |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 655 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 656 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 657 | llvm::Constant *VisitInitListExpr(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 658 | if (ILE->getType()->isScalarType()) { |
| 659 | // We have a scalar in braces. Just use the first element. |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 660 | if (ILE->getNumInits() > 0) { |
| 661 | Expr *Init = ILE->getInit(0); |
| 662 | return CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
| 663 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 664 | return CGM.EmitNullConstant(ILE->getType()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 665 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 666 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 667 | if (ILE->getType()->isArrayType()) |
| 668 | return EmitArrayInitialization(ILE); |
Devang Patel | 47fb697 | 2008-01-29 23:23:18 +0000 | [diff] [blame] | 669 | |
Anders Carlsson | 01a79ac | 2009-11-21 23:56:04 +0000 | [diff] [blame] | 670 | if (ILE->getType()->isRecordType()) |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 671 | return EmitStructInitialization(ILE); |
| 672 | |
| 673 | if (ILE->getType()->isUnionType()) |
| 674 | return EmitUnionInitialization(ILE); |
| 675 | |
Eli Friedman | 8ac5549 | 2010-01-02 23:43:59 +0000 | [diff] [blame] | 676 | // If ILE was a constant vector, we would have handled it already. |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 677 | if (ILE->getType()->isVectorType()) |
Eli Friedman | 8ac5549 | 2010-01-02 23:43:59 +0000 | [diff] [blame] | 678 | return 0; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 679 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 680 | assert(0 && "Unable to handle InitListExpr"); |
Chris Lattner | 2b94fe3 | 2008-03-01 08:45:05 +0000 | [diff] [blame] | 681 | // Get rid of control reaches end of void function warning. |
| 682 | // Not reached. |
| 683 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 684 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 685 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 686 | llvm::Constant *VisitCXXConstructExpr(CXXConstructExpr *E) { |
| 687 | if (!E->getConstructor()->isTrivial()) |
| 688 | return 0; |
| 689 | |
Anders Carlsson | 2ca4f63 | 2010-02-05 18:38:45 +0000 | [diff] [blame] | 690 | QualType Ty = E->getType(); |
| 691 | |
| 692 | // FIXME: We should not have to call getBaseElementType here. |
| 693 | const RecordType *RT = |
| 694 | CGM.getContext().getBaseElementType(Ty)->getAs<RecordType>(); |
| 695 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 696 | |
| 697 | // If the class doesn't have a trivial destructor, we can't emit it as a |
| 698 | // constant expr. |
| 699 | if (!RD->hasTrivialDestructor()) |
| 700 | return 0; |
| 701 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 702 | // Only copy and default constructors can be trivial. |
| 703 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 704 | |
| 705 | if (E->getNumArgs()) { |
| 706 | assert(E->getNumArgs() == 1 && "trivial ctor with > 1 argument"); |
| 707 | assert(E->getConstructor()->isCopyConstructor() && |
| 708 | "trivial ctor has argument but isn't a copy ctor"); |
| 709 | |
| 710 | Expr *Arg = E->getArg(0); |
| 711 | assert(CGM.getContext().hasSameUnqualifiedType(Ty, Arg->getType()) && |
| 712 | "argument to copy ctor is of wrong type"); |
| 713 | |
Chandler Carruth | 878b55c | 2010-02-02 12:15:55 +0000 | [diff] [blame] | 714 | return Visit(Arg); |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | return CGM.EmitNullConstant(Ty); |
| 718 | } |
| 719 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 720 | llvm::Constant *VisitStringLiteral(StringLiteral *E) { |
Chris Lattner | a7ad98f | 2008-02-11 00:02:17 +0000 | [diff] [blame] | 721 | assert(!E->getType()->isPointerType() && "Strings are always arrays"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 722 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 723 | // This must be a string initializing an array in a static initializer. |
| 724 | // Don't emit it as the address of the string, emit the string data itself |
| 725 | // as an inline array. |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 726 | return llvm::ConstantArray::get(VMContext, |
| 727 | CGM.GetStringForStringLiteral(E), false); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 728 | } |
| 729 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 730 | llvm::Constant *VisitObjCEncodeExpr(ObjCEncodeExpr *E) { |
| 731 | // This must be an @encode initializing an array in a static initializer. |
| 732 | // Don't emit it as the address of the string, emit the string data itself |
| 733 | // as an inline array. |
| 734 | std::string Str; |
| 735 | CGM.getContext().getObjCEncodingForType(E->getEncodedType(), Str); |
| 736 | const ConstantArrayType *CAT = cast<ConstantArrayType>(E->getType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 737 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 738 | // Resize the string to the right size, adding zeros at the end, or |
| 739 | // truncating as needed. |
| 740 | Str.resize(CAT->getSize().getZExtValue(), '\0'); |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 741 | return llvm::ConstantArray::get(VMContext, Str, false); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 742 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 743 | |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 744 | llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) { |
| 745 | return Visit(E->getSubExpr()); |
| 746 | } |
Mike Stump | b83d287 | 2009-02-19 22:01:56 +0000 | [diff] [blame] | 747 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 748 | // Utility methods |
| 749 | const llvm::Type *ConvertType(QualType T) { |
| 750 | return CGM.getTypes().ConvertType(T); |
| 751 | } |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 752 | |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 753 | public: |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 754 | llvm::Constant *EmitLValue(Expr *E) { |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 755 | switch (E->getStmtClass()) { |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 756 | default: break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 757 | case Expr::CompoundLiteralExprClass: { |
| 758 | // Note that due to the nature of compound literals, this is guaranteed |
| 759 | // to be the only use of the variable, so we just generate it here. |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 760 | CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); |
| 761 | llvm::Constant* C = Visit(CLE->getInitializer()); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 762 | // FIXME: "Leaked" on failure. |
| 763 | if (C) |
Owen Anderson | 1c431b3 | 2009-07-08 19:05:04 +0000 | [diff] [blame] | 764 | C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), |
Eli Friedman | d15d8c6 | 2009-08-26 20:01:39 +0000 | [diff] [blame] | 765 | E->getType().isConstant(CGM.getContext()), |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 766 | llvm::GlobalValue::InternalLinkage, |
Eli Friedman | d15d8c6 | 2009-08-26 20:01:39 +0000 | [diff] [blame] | 767 | C, ".compoundliteral", 0, false, |
| 768 | E->getType().getAddressSpace()); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 769 | return C; |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 770 | } |
Douglas Gregor | a2813ce | 2009-10-23 18:54:35 +0000 | [diff] [blame] | 771 | case Expr::DeclRefExprClass: { |
Rafael Espindola | da18261 | 2010-03-04 21:26:03 +0000 | [diff] [blame] | 772 | ValueDecl *Decl = cast<DeclRefExpr>(E)->getDecl(); |
| 773 | if (Decl->hasAttr<WeakRefAttr>()) |
| 774 | return CGM.GetWeakRefReference(Decl); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 775 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl)) |
Anders Carlsson | 555b4bb | 2009-09-10 23:43:36 +0000 | [diff] [blame] | 776 | return CGM.GetAddrOfFunction(FD); |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 777 | if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 778 | // We can never refer to a variable with local storage. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 779 | if (!VD->hasLocalStorage()) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 780 | if (VD->isFileVarDecl() || VD->hasExternalStorage()) |
| 781 | return CGM.GetAddrOfGlobalVar(VD); |
| 782 | else if (VD->isBlockVarDecl()) { |
| 783 | assert(CGF && "Can't access static local vars without CGF"); |
| 784 | return CGF->GetAddrOfStaticLocalVar(VD); |
| 785 | } |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 786 | } |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 787 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 788 | break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 789 | } |
Daniel Dunbar | 6143293 | 2008-08-13 23:20:05 +0000 | [diff] [blame] | 790 | case Expr::StringLiteralClass: |
| 791 | return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E)); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 792 | case Expr::ObjCEncodeExprClass: |
| 793 | return CGM.GetAddrOfConstantStringFromObjCEncode(cast<ObjCEncodeExpr>(E)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 794 | case Expr::ObjCStringLiteralClass: { |
| 795 | ObjCStringLiteral* SL = cast<ObjCStringLiteral>(E); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 796 | llvm::Constant *C = |
| 797 | CGM.getObjCRuntime().GenerateConstantString(SL->getString()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 798 | return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType())); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 799 | } |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 800 | case Expr::PredefinedExprClass: { |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 801 | unsigned Type = cast<PredefinedExpr>(E)->getIdentType(); |
| 802 | if (CGF) { |
| 803 | LValue Res = CGF->EmitPredefinedFunctionName(Type); |
| 804 | return cast<llvm::Constant>(Res.getAddress()); |
| 805 | } else if (Type == PredefinedExpr::PrettyFunction) { |
| 806 | return CGM.GetAddrOfConstantCString("top level", ".tmp"); |
| 807 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 808 | |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 809 | return CGM.GetAddrOfConstantCString("", ".tmp"); |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 810 | } |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 811 | case Expr::AddrLabelExprClass: { |
| 812 | assert(CGF && "Invalid address of label expression outside function."); |
Chris Lattner | d9becd1 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 813 | llvm::Constant *Ptr = |
| 814 | CGF->GetAddrOfLabel(cast<AddrLabelExpr>(E)->getLabel()); |
| 815 | return llvm::ConstantExpr::getBitCast(Ptr, ConvertType(E->getType())); |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 816 | } |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 817 | case Expr::CallExprClass: { |
| 818 | CallExpr* CE = cast<CallExpr>(E); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 819 | unsigned builtin = CE->isBuiltinCall(CGM.getContext()); |
| 820 | if (builtin != |
| 821 | Builtin::BI__builtin___CFStringMakeConstantString && |
| 822 | builtin != |
| 823 | Builtin::BI__builtin___NSStringMakeConstantString) |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 824 | break; |
| 825 | const Expr *Arg = CE->getArg(0)->IgnoreParenCasts(); |
| 826 | const StringLiteral *Literal = cast<StringLiteral>(Arg); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 827 | if (builtin == |
| 828 | Builtin::BI__builtin___NSStringMakeConstantString) { |
| 829 | return CGM.getObjCRuntime().GenerateConstantString(Literal); |
| 830 | } |
Steve Naroff | 33fdb73 | 2009-03-31 16:53:37 +0000 | [diff] [blame] | 831 | // FIXME: need to deal with UCN conversion issues. |
Steve Naroff | 8d4141f | 2009-04-01 13:55:36 +0000 | [diff] [blame] | 832 | return CGM.GetAddrOfConstantCFString(Literal); |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 833 | } |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 834 | case Expr::BlockExprClass: { |
Anders Carlsson | 4de9fce | 2009-03-01 01:09:12 +0000 | [diff] [blame] | 835 | std::string FunctionName; |
| 836 | if (CGF) |
| 837 | FunctionName = CGF->CurFn->getName(); |
| 838 | else |
| 839 | FunctionName = "global"; |
| 840 | |
| 841 | return CGM.GetAddrOfGlobalBlock(cast<BlockExpr>(E), FunctionName.c_str()); |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 842 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 843 | } |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 844 | |
| 845 | return 0; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 846 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 847 | }; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 848 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 849 | } // end anonymous namespace. |
| 850 | |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 851 | llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E, |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 852 | QualType DestType, |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 853 | CodeGenFunction *CGF) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 854 | Expr::EvalResult Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 855 | |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 856 | bool Success = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 857 | |
Eli Friedman | 50c39ea | 2009-05-27 06:04:58 +0000 | [diff] [blame] | 858 | if (DestType->isReferenceType()) |
| 859 | Success = E->EvaluateAsLValue(Result, Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 860 | else |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 861 | Success = E->Evaluate(Result, Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 862 | |
Eli Friedman | 55f9bdd | 2009-11-14 08:51:33 +0000 | [diff] [blame] | 863 | if (Success && !Result.HasSideEffects) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 864 | switch (Result.Val.getKind()) { |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 865 | case APValue::Uninitialized: |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 866 | assert(0 && "Constant expressions should be initialized."); |
| 867 | return 0; |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 868 | case APValue::LValue: { |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 869 | const llvm::Type *DestTy = getTypes().ConvertTypeForMem(DestType); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 870 | llvm::Constant *Offset = |
| 871 | llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), |
Ken Dyck | a730583 | 2010-01-15 12:37:54 +0000 | [diff] [blame] | 872 | Result.Val.getLValueOffset().getQuantity()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 873 | |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 874 | llvm::Constant *C; |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 875 | if (const Expr *LVBase = Result.Val.getLValueBase()) { |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 876 | C = ConstExprEmitter(*this, CGF).EmitLValue(const_cast<Expr*>(LVBase)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 877 | |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 878 | // Apply offset if necessary. |
| 879 | if (!Offset->isNullValue()) { |
Benjamin Kramer | 3c0ef8c | 2009-10-13 10:07:13 +0000 | [diff] [blame] | 880 | const llvm::Type *Type = llvm::Type::getInt8PtrTy(VMContext); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 881 | llvm::Constant *Casted = llvm::ConstantExpr::getBitCast(C, Type); |
| 882 | Casted = llvm::ConstantExpr::getGetElementPtr(Casted, &Offset, 1); |
| 883 | C = llvm::ConstantExpr::getBitCast(Casted, C->getType()); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 884 | } |
| 885 | |
| 886 | // Convert to the appropriate type; this could be an lvalue for |
| 887 | // an integer. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 888 | if (isa<llvm::PointerType>(DestTy)) |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 889 | return llvm::ConstantExpr::getBitCast(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 890 | |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 891 | return llvm::ConstantExpr::getPtrToInt(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 892 | } else { |
| 893 | C = Offset; |
| 894 | |
| 895 | // Convert to the appropriate type; this could be an lvalue for |
| 896 | // an integer. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 897 | if (isa<llvm::PointerType>(DestTy)) |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 898 | return llvm::ConstantExpr::getIntToPtr(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 899 | |
| 900 | // If the types don't match this should only be a truncate. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 901 | if (C->getType() != DestTy) |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 902 | return llvm::ConstantExpr::getTrunc(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 903 | |
| 904 | return C; |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 905 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 906 | } |
Eli Friedman | 7b30b1c | 2008-11-17 03:57:28 +0000 | [diff] [blame] | 907 | case APValue::Int: { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 908 | llvm::Constant *C = llvm::ConstantInt::get(VMContext, |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 909 | Result.Val.getInt()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 910 | |
Chris Lattner | 7f215c1 | 2010-06-26 21:52:32 +0000 | [diff] [blame^] | 911 | if (C->getType()->isIntegerTy(1)) { |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 912 | const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 913 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 914 | } |
| 915 | return C; |
Eli Friedman | 7b30b1c | 2008-11-17 03:57:28 +0000 | [diff] [blame] | 916 | } |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 917 | case APValue::ComplexInt: { |
| 918 | llvm::Constant *Complex[2]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 919 | |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 920 | Complex[0] = llvm::ConstantInt::get(VMContext, |
| 921 | Result.Val.getComplexIntReal()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 922 | Complex[1] = llvm::ConstantInt::get(VMContext, |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 923 | Result.Val.getComplexIntImag()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 924 | |
Nick Lewycky | 0d36dd2 | 2009-09-19 20:00:52 +0000 | [diff] [blame] | 925 | // FIXME: the target may want to specify that this is packed. |
| 926 | return llvm::ConstantStruct::get(VMContext, Complex, 2, false); |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 927 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 928 | case APValue::Float: |
Owen Anderson | bc0a222 | 2009-07-27 21:00:51 +0000 | [diff] [blame] | 929 | return llvm::ConstantFP::get(VMContext, Result.Val.getFloat()); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 930 | case APValue::ComplexFloat: { |
| 931 | llvm::Constant *Complex[2]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 932 | |
| 933 | Complex[0] = llvm::ConstantFP::get(VMContext, |
Owen Anderson | bc0a222 | 2009-07-27 21:00:51 +0000 | [diff] [blame] | 934 | Result.Val.getComplexFloatReal()); |
| 935 | Complex[1] = llvm::ConstantFP::get(VMContext, |
| 936 | Result.Val.getComplexFloatImag()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 937 | |
Nick Lewycky | 0d36dd2 | 2009-09-19 20:00:52 +0000 | [diff] [blame] | 938 | // FIXME: the target may want to specify that this is packed. |
| 939 | return llvm::ConstantStruct::get(VMContext, Complex, 2, false); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 940 | } |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 941 | case APValue::Vector: { |
| 942 | llvm::SmallVector<llvm::Constant *, 4> Inits; |
| 943 | unsigned NumElts = Result.Val.getVectorLength(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 944 | |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 945 | for (unsigned i = 0; i != NumElts; ++i) { |
| 946 | APValue &Elt = Result.Val.getVectorElt(i); |
| 947 | if (Elt.isInt()) |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 948 | Inits.push_back(llvm::ConstantInt::get(VMContext, Elt.getInt())); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 949 | else |
Owen Anderson | bc0a222 | 2009-07-27 21:00:51 +0000 | [diff] [blame] | 950 | Inits.push_back(llvm::ConstantFP::get(VMContext, Elt.getFloat())); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 951 | } |
Owen Anderson | 4a28932 | 2009-07-28 21:22:35 +0000 | [diff] [blame] | 952 | return llvm::ConstantVector::get(&Inits[0], Inits.size()); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 953 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 954 | } |
| 955 | } |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 956 | |
| 957 | llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E)); |
Chris Lattner | 7f215c1 | 2010-06-26 21:52:32 +0000 | [diff] [blame^] | 958 | if (C && C->getType()->isIntegerTy(1)) { |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 959 | const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 960 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 961 | } |
| 962 | return C; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 963 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 964 | |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 965 | static void |
| 966 | FillInNullDataMemberPointers(CodeGenModule &CGM, QualType T, |
| 967 | std::vector<llvm::Constant *> &Elements, |
| 968 | uint64_t StartOffset) { |
| 969 | assert(StartOffset % 8 == 0 && "StartOffset not byte aligned!"); |
| 970 | |
| 971 | if (!CGM.getTypes().ContainsPointerToDataMember(T)) |
| 972 | return; |
| 973 | |
| 974 | if (const ConstantArrayType *CAT = |
| 975 | CGM.getContext().getAsConstantArrayType(T)) { |
| 976 | QualType ElementTy = CAT->getElementType(); |
| 977 | uint64_t ElementSize = CGM.getContext().getTypeSize(ElementTy); |
| 978 | |
| 979 | for (uint64_t I = 0, E = CAT->getSize().getZExtValue(); I != E; ++I) { |
| 980 | FillInNullDataMemberPointers(CGM, ElementTy, Elements, |
| 981 | StartOffset + I * ElementSize); |
| 982 | } |
| 983 | } else if (const RecordType *RT = T->getAs<RecordType>()) { |
| 984 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 985 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 986 | |
| 987 | // Go through all bases and fill in any null pointer to data members. |
| 988 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 989 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | 0a87b37 | 2010-05-27 18:51:01 +0000 | [diff] [blame] | 990 | if (I->isVirtual()) { |
| 991 | // FIXME: We should initialize null pointer to data members in virtual |
| 992 | // bases here. |
| 993 | continue; |
| 994 | } |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 995 | |
| 996 | const CXXRecordDecl *BaseDecl = |
| 997 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 998 | |
| 999 | // Ignore empty bases. |
| 1000 | if (BaseDecl->isEmpty()) |
| 1001 | continue; |
| 1002 | |
| 1003 | // Ignore bases that don't have any pointer to data members. |
| 1004 | if (!CGM.getTypes().ContainsPointerToDataMember(BaseDecl)) |
| 1005 | continue; |
| 1006 | |
| 1007 | uint64_t BaseOffset = Layout.getBaseClassOffset(BaseDecl); |
| 1008 | FillInNullDataMemberPointers(CGM, I->getType(), |
| 1009 | Elements, StartOffset + BaseOffset); |
| 1010 | } |
| 1011 | |
| 1012 | // Visit all fields. |
| 1013 | unsigned FieldNo = 0; |
| 1014 | for (RecordDecl::field_iterator I = RD->field_begin(), |
| 1015 | E = RD->field_end(); I != E; ++I, ++FieldNo) { |
| 1016 | QualType FieldType = I->getType(); |
| 1017 | |
| 1018 | if (!CGM.getTypes().ContainsPointerToDataMember(FieldType)) |
| 1019 | continue; |
| 1020 | |
| 1021 | uint64_t FieldOffset = StartOffset + Layout.getFieldOffset(FieldNo); |
| 1022 | FillInNullDataMemberPointers(CGM, FieldType, Elements, FieldOffset); |
| 1023 | } |
| 1024 | } else { |
| 1025 | assert(T->isMemberPointerType() && "Should only see member pointers here!"); |
| 1026 | assert(!T->getAs<MemberPointerType>()->getPointeeType()->isFunctionType() && |
| 1027 | "Should only see pointers to data members here!"); |
| 1028 | |
| 1029 | uint64_t StartIndex = StartOffset / 8; |
| 1030 | uint64_t EndIndex = StartIndex + CGM.getContext().getTypeSize(T) / 8; |
| 1031 | |
| 1032 | llvm::Constant *NegativeOne = |
| 1033 | llvm::ConstantInt::get(llvm::Type::getInt8Ty(CGM.getLLVMContext()), |
| 1034 | -1ULL, /*isSigned=*/true); |
| 1035 | |
| 1036 | // Fill in the null data member pointer. |
| 1037 | for (uint64_t I = StartIndex; I != EndIndex; ++I) |
| 1038 | Elements[I] = NegativeOne; |
| 1039 | } |
| 1040 | } |
| 1041 | |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 1042 | llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) { |
Anders Carlsson | 3e5af90 | 2010-05-14 19:41:56 +0000 | [diff] [blame] | 1043 | if (!getTypes().ContainsPointerToDataMember(T)) |
Anders Carlsson | ad3e711 | 2009-08-24 17:16:23 +0000 | [diff] [blame] | 1044 | return llvm::Constant::getNullValue(getTypes().ConvertTypeForMem(T)); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1045 | |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 1046 | if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(T)) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1047 | |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 1048 | QualType ElementTy = CAT->getElementType(); |
| 1049 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1050 | llvm::Constant *Element = EmitNullConstant(ElementTy); |
| 1051 | unsigned NumElements = CAT->getSize().getZExtValue(); |
| 1052 | std::vector<llvm::Constant *> Array(NumElements); |
| 1053 | for (unsigned i = 0; i != NumElements; ++i) |
| 1054 | Array[i] = Element; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1055 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1056 | const llvm::ArrayType *ATy = |
| 1057 | cast<llvm::ArrayType>(getTypes().ConvertTypeForMem(T)); |
| 1058 | return llvm::ConstantArray::get(ATy, Array); |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 1059 | } |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 1060 | |
| 1061 | if (const RecordType *RT = T->getAs<RecordType>()) { |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1062 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1063 | const llvm::StructType *STy = |
| 1064 | cast<llvm::StructType>(getTypes().ConvertTypeForMem(T)); |
| 1065 | unsigned NumElements = STy->getNumElements(); |
| 1066 | std::vector<llvm::Constant *> Elements(NumElements); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1067 | |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1068 | const CGRecordLayout &Layout = getTypes().getCGRecordLayout(RD); |
| 1069 | |
| 1070 | // Go through all bases and fill in any null pointer to data members. |
| 1071 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1072 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | 0a87b37 | 2010-05-27 18:51:01 +0000 | [diff] [blame] | 1073 | if (I->isVirtual()) { |
| 1074 | // FIXME: We should initialize null pointer to data members in virtual |
| 1075 | // bases here. |
| 1076 | continue; |
| 1077 | } |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1078 | |
| 1079 | const CXXRecordDecl *BaseDecl = |
| 1080 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 1081 | |
| 1082 | // Ignore empty bases. |
| 1083 | if (BaseDecl->isEmpty()) |
| 1084 | continue; |
| 1085 | |
| 1086 | // Ignore bases that don't have any pointer to data members. |
| 1087 | if (!getTypes().ContainsPointerToDataMember(BaseDecl)) |
| 1088 | continue; |
| 1089 | |
| 1090 | // Currently, all bases are arrays of i8. Figure out how many elements |
| 1091 | // this base array has. |
| 1092 | unsigned BaseFieldNo = Layout.getNonVirtualBaseLLVMFieldNo(BaseDecl); |
| 1093 | const llvm::ArrayType *BaseArrayTy = |
| 1094 | cast<llvm::ArrayType>(STy->getElementType(BaseFieldNo)); |
| 1095 | |
| 1096 | unsigned NumBaseElements = BaseArrayTy->getNumElements(); |
| 1097 | std::vector<llvm::Constant *> BaseElements(NumBaseElements); |
| 1098 | |
| 1099 | // Now fill in null data member pointers. |
| 1100 | FillInNullDataMemberPointers(*this, I->getType(), BaseElements, 0); |
| 1101 | |
| 1102 | // Now go through all other elements and zero them out. |
| 1103 | if (NumBaseElements) { |
| 1104 | llvm::Constant *Zero = |
| 1105 | llvm::ConstantInt::get(llvm::Type::getInt8Ty(getLLVMContext()), 0); |
| 1106 | |
| 1107 | for (unsigned I = 0; I != NumBaseElements; ++I) { |
| 1108 | if (!BaseElements[I]) |
| 1109 | BaseElements[I] = Zero; |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | Elements[BaseFieldNo] = llvm::ConstantArray::get(BaseArrayTy, |
| 1114 | BaseElements); |
| 1115 | } |
| 1116 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1117 | for (RecordDecl::field_iterator I = RD->field_begin(), |
| 1118 | E = RD->field_end(); I != E; ++I) { |
| 1119 | const FieldDecl *FD = *I; |
Anders Carlsson | e9a05b7 | 2010-06-03 15:36:07 +0000 | [diff] [blame] | 1120 | |
| 1121 | // Ignore bit fields. |
| 1122 | if (FD->isBitField()) |
| 1123 | continue; |
| 1124 | |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1125 | unsigned FieldNo = Layout.getLLVMFieldNo(FD); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1126 | Elements[FieldNo] = EmitNullConstant(FD->getType()); |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 1127 | } |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1128 | |
| 1129 | // Now go through all other fields and zero them out. |
| 1130 | for (unsigned i = 0; i != NumElements; ++i) { |
| 1131 | if (!Elements[i]) |
| 1132 | Elements[i] = llvm::Constant::getNullValue(STy->getElementType(i)); |
| 1133 | } |
| 1134 | |
| 1135 | return llvm::ConstantStruct::get(STy, Elements); |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 1136 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1137 | |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1138 | assert(T->isMemberPointerType() && "Should only see member pointers here!"); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1139 | assert(!T->getAs<MemberPointerType>()->getPointeeType()->isFunctionType() && |
| 1140 | "Should only see pointers to data members here!"); |
| 1141 | |
| 1142 | // Itanium C++ ABI 2.3: |
| 1143 | // A NULL pointer is represented as -1. |
Chris Lattner | c0f3df3 | 2010-02-10 21:41:43 +0000 | [diff] [blame] | 1144 | return llvm::ConstantInt::get(getTypes().ConvertTypeForMem(T), -1ULL, |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1145 | /*isSigned=*/true); |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 1146 | } |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 1147 | |
| 1148 | llvm::Constant * |
| 1149 | CodeGenModule::EmitPointerToDataMember(const FieldDecl *FD) { |
| 1150 | |
| 1151 | // Itanium C++ ABI 2.3: |
| 1152 | // A pointer to data member is an offset from the base address of the class |
| 1153 | // object containing it, represented as a ptrdiff_t |
| 1154 | |
| 1155 | const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(FD->getParent()); |
| 1156 | QualType ClassType = |
| 1157 | getContext().getTypeDeclType(const_cast<CXXRecordDecl *>(ClassDecl)); |
| 1158 | |
| 1159 | const llvm::StructType *ClassLTy = |
| 1160 | cast<llvm::StructType>(getTypes().ConvertType(ClassType)); |
| 1161 | |
Daniel Dunbar | 198bcb4 | 2010-03-31 01:09:11 +0000 | [diff] [blame] | 1162 | const CGRecordLayout &RL = |
| 1163 | getTypes().getCGRecordLayout(FD->getParent()); |
| 1164 | unsigned FieldNo = RL.getLLVMFieldNo(FD); |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 1165 | uint64_t Offset = |
| 1166 | getTargetData().getStructLayout(ClassLTy)->getElementOffset(FieldNo); |
| 1167 | |
| 1168 | const llvm::Type *PtrDiffTy = |
| 1169 | getTypes().ConvertType(getContext().getPointerDiffType()); |
| 1170 | |
| 1171 | return llvm::ConstantInt::get(PtrDiffTy, Offset); |
| 1172 | } |