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" |
Chris Lattner | f6b24ea | 2008-10-06 05:59:01 +0000 | [diff] [blame] | 17 | #include "clang/AST/APValue.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 18 | #include "clang/AST/ASTContext.h" |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 19 | #include "clang/AST/RecordLayout.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 20 | #include "clang/AST/StmtVisitor.h" |
Chris Lattner | 1b63e4f | 2009-06-14 01:54:56 +0000 | [diff] [blame] | 21 | #include "clang/Basic/Builtins.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 22 | #include "llvm/Constants.h" |
| 23 | #include "llvm/Function.h" |
| 24 | #include "llvm/GlobalVariable.h" |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 25 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 26 | using namespace clang; |
| 27 | using namespace CodeGen; |
| 28 | |
| 29 | namespace { |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 30 | class ConstStructBuilder { |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 31 | CodeGenModule &CGM; |
| 32 | CodeGenFunction *CGF; |
| 33 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 34 | bool Packed; |
Anders Carlsson | 4257bc6 | 2009-07-25 00:24:56 +0000 | [diff] [blame] | 35 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 36 | unsigned NextFieldOffsetInBytes; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 37 | |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 38 | unsigned LLVMStructAlignment; |
| 39 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 40 | std::vector<llvm::Constant *> Elements; |
| 41 | |
| 42 | ConstStructBuilder(CodeGenModule &CGM, CodeGenFunction *CGF) |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 43 | : CGM(CGM), CGF(CGF), Packed(false), NextFieldOffsetInBytes(0), |
| 44 | LLVMStructAlignment(1) { } |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 45 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 46 | bool AppendField(const FieldDecl *Field, uint64_t FieldOffset, |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 47 | const Expr *InitExpr) { |
| 48 | uint64_t FieldOffsetInBytes = FieldOffset / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 49 | |
| 50 | assert(NextFieldOffsetInBytes <= FieldOffsetInBytes |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 51 | && "Field offset mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 52 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 53 | // Emit the field. |
| 54 | llvm::Constant *C = CGM.EmitConstantExpr(InitExpr, Field->getType(), CGF); |
| 55 | if (!C) |
| 56 | return false; |
| 57 | |
| 58 | unsigned FieldAlignment = getAlignment(C); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 59 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 60 | // Round up the field offset to the alignment of the field type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 61 | uint64_t AlignedNextFieldOffsetInBytes = |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 62 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 63 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 64 | if (AlignedNextFieldOffsetInBytes > FieldOffsetInBytes) { |
Anders Carlsson | bea9c52 | 2009-07-25 01:40:29 +0000 | [diff] [blame] | 65 | assert(!Packed && "Alignment is wrong even with a packed struct!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 66 | |
Anders Carlsson | bea9c52 | 2009-07-25 01:40:29 +0000 | [diff] [blame] | 67 | // Convert the struct to a packed struct. |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 68 | ConvertStructToPacked(); |
| 69 | |
Anders Carlsson | bea9c52 | 2009-07-25 01:40:29 +0000 | [diff] [blame] | 70 | AlignedNextFieldOffsetInBytes = NextFieldOffsetInBytes; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 74 | // We need to append padding. |
Anders Carlsson | bea9c52 | 2009-07-25 01:40:29 +0000 | [diff] [blame] | 75 | AppendPadding(FieldOffsetInBytes - NextFieldOffsetInBytes); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 76 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 77 | assert(NextFieldOffsetInBytes == FieldOffsetInBytes && |
| 78 | "Did not add enough padding!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 79 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 80 | AlignedNextFieldOffsetInBytes = NextFieldOffsetInBytes; |
| 81 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 82 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 83 | // Add the field. |
| 84 | Elements.push_back(C); |
| 85 | NextFieldOffsetInBytes = AlignedNextFieldOffsetInBytes + getSizeInBytes(C); |
Anders Carlsson | 2df96e7 | 2009-10-02 04:52:12 +0000 | [diff] [blame] | 86 | |
| 87 | if (Packed) |
| 88 | assert(LLVMStructAlignment == 1 && "Packed struct not byte-aligned!"); |
| 89 | else |
| 90 | LLVMStructAlignment = std::max(LLVMStructAlignment, FieldAlignment); |
| 91 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 92 | return true; |
| 93 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 94 | |
| 95 | bool AppendBitField(const FieldDecl *Field, uint64_t FieldOffset, |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 96 | const Expr *InitExpr) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 97 | llvm::ConstantInt *CI = |
| 98 | cast_or_null<llvm::ConstantInt>(CGM.EmitConstantExpr(InitExpr, |
| 99 | Field->getType(), |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 100 | CGF)); |
| 101 | // FIXME: Can this ever happen? |
| 102 | if (!CI) |
| 103 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 104 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 105 | if (FieldOffset > NextFieldOffsetInBytes * 8) { |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 106 | // We need to add padding. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 107 | uint64_t NumBytes = |
| 108 | llvm::RoundUpToAlignment(FieldOffset - |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 109 | NextFieldOffsetInBytes * 8, 8) / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 110 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 111 | AppendPadding(NumBytes); |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 112 | } |
| 113 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 114 | uint64_t FieldSize = |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 115 | Field->getBitWidth()->EvaluateAsInt(CGM.getContext()).getZExtValue(); |
| 116 | |
| 117 | llvm::APInt FieldValue = CI->getValue(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 118 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 119 | // Promote the size of FieldValue if necessary |
| 120 | // FIXME: This should never occur, but currently it can because initializer |
| 121 | // constants are cast to bool, and because clang is not enforcing bitfield |
| 122 | // width limits. |
| 123 | if (FieldSize > FieldValue.getBitWidth()) |
| 124 | FieldValue.zext(FieldSize); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 125 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 126 | // Truncate the size of FieldValue to the bit field size. |
| 127 | if (FieldSize < FieldValue.getBitWidth()) |
| 128 | FieldValue.trunc(FieldSize); |
| 129 | |
| 130 | if (FieldOffset < NextFieldOffsetInBytes * 8) { |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 131 | // Either part of the field or the entire field can go into the previous |
| 132 | // byte. |
| 133 | assert(!Elements.empty() && "Elements can't be empty!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 134 | |
| 135 | unsigned BitsInPreviousByte = |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 136 | NextFieldOffsetInBytes * 8 - FieldOffset; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 137 | |
| 138 | bool FitsCompletelyInPreviousByte = |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 139 | BitsInPreviousByte >= FieldValue.getBitWidth(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 140 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 141 | llvm::APInt Tmp = FieldValue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 142 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 143 | if (!FitsCompletelyInPreviousByte) { |
| 144 | unsigned NewFieldWidth = FieldSize - BitsInPreviousByte; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 145 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 146 | if (CGM.getTargetData().isBigEndian()) { |
| 147 | Tmp = Tmp.lshr(NewFieldWidth); |
| 148 | Tmp.trunc(BitsInPreviousByte); |
| 149 | |
| 150 | // We want the remaining high bits. |
| 151 | FieldValue.trunc(NewFieldWidth); |
| 152 | } else { |
| 153 | Tmp.trunc(BitsInPreviousByte); |
| 154 | |
| 155 | // We want the remaining low bits. |
| 156 | FieldValue = FieldValue.lshr(BitsInPreviousByte); |
| 157 | FieldValue.trunc(NewFieldWidth); |
| 158 | } |
| 159 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 160 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 161 | Tmp.zext(8); |
| 162 | if (CGM.getTargetData().isBigEndian()) { |
| 163 | if (FitsCompletelyInPreviousByte) |
| 164 | Tmp = Tmp.shl(BitsInPreviousByte - FieldValue.getBitWidth()); |
| 165 | } else { |
| 166 | Tmp = Tmp.shl(8 - BitsInPreviousByte); |
| 167 | } |
| 168 | |
| 169 | // Or in the bits that go into the previous byte. |
Daniel Dunbar | 88b172c | 2009-12-08 21:12:32 +0000 | [diff] [blame] | 170 | if (llvm::ConstantInt *Val = dyn_cast<llvm::ConstantInt>(Elements.back())) |
| 171 | Tmp |= Val->getValue(); |
| 172 | else |
| 173 | assert(isa<llvm::UndefValue>(Elements.back())); |
| 174 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 175 | Elements.back() = llvm::ConstantInt::get(CGM.getLLVMContext(), Tmp); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 176 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 177 | if (FitsCompletelyInPreviousByte) |
| 178 | return true; |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 179 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 180 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 181 | while (FieldValue.getBitWidth() > 8) { |
| 182 | llvm::APInt Tmp; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 183 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 184 | if (CGM.getTargetData().isBigEndian()) { |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 185 | // We want the high bits. |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 186 | Tmp = FieldValue; |
| 187 | Tmp = Tmp.lshr(Tmp.getBitWidth() - 8); |
| 188 | Tmp.trunc(8); |
| 189 | } else { |
| 190 | // We want the low bits. |
| 191 | Tmp = FieldValue; |
| 192 | Tmp.trunc(8); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 193 | |
Anders Carlsson | 7a86d4b | 2009-07-27 02:56:37 +0000 | [diff] [blame] | 194 | FieldValue = FieldValue.lshr(8); |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 195 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 196 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 197 | Elements.push_back(llvm::ConstantInt::get(CGM.getLLVMContext(), Tmp)); |
| 198 | NextFieldOffsetInBytes++; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 199 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 200 | FieldValue.trunc(FieldValue.getBitWidth() - 8); |
| 201 | } |
| 202 | |
| 203 | assert(FieldValue.getBitWidth() > 0 && |
| 204 | "Should have at least one bit left!"); |
| 205 | assert(FieldValue.getBitWidth() <= 8 && |
| 206 | "Should not have more than a byte left!"); |
| 207 | |
| 208 | if (FieldValue.getBitWidth() < 8) { |
| 209 | if (CGM.getTargetData().isBigEndian()) { |
| 210 | unsigned BitWidth = FieldValue.getBitWidth(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 211 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 212 | FieldValue.zext(8); |
| 213 | FieldValue = FieldValue << (8 - BitWidth); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 214 | } else |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 215 | FieldValue.zext(8); |
| 216 | } |
| 217 | |
| 218 | // Append the last element. |
| 219 | Elements.push_back(llvm::ConstantInt::get(CGM.getLLVMContext(), |
| 220 | FieldValue)); |
| 221 | NextFieldOffsetInBytes++; |
| 222 | return true; |
| 223 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 224 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 225 | void AppendPadding(uint64_t NumBytes) { |
| 226 | if (!NumBytes) |
| 227 | return; |
| 228 | |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 229 | const llvm::Type *Ty = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 230 | if (NumBytes > 1) |
Owen Anderson | 96e0fc7 | 2009-07-29 22:16:19 +0000 | [diff] [blame] | 231 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 232 | |
Nuno Lopes | c6eb131 | 2009-10-29 11:27:06 +0000 | [diff] [blame] | 233 | llvm::Constant *C = llvm::UndefValue::get(Ty); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 234 | Elements.push_back(C); |
| 235 | assert(getAlignment(C) == 1 && "Padding must have 1 byte alignment!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 236 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 237 | NextFieldOffsetInBytes += getSizeInBytes(C); |
| 238 | } |
| 239 | |
| 240 | void AppendTailPadding(uint64_t RecordSize) { |
| 241 | assert(RecordSize % 8 == 0 && "Invalid record size!"); |
| 242 | |
| 243 | uint64_t RecordSizeInBytes = RecordSize / 8; |
| 244 | assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 245 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 246 | unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes; |
| 247 | AppendPadding(NumPadBytes); |
| 248 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 249 | |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 250 | void ConvertStructToPacked() { |
| 251 | std::vector<llvm::Constant *> PackedElements; |
| 252 | uint64_t ElementOffsetInBytes = 0; |
| 253 | |
| 254 | for (unsigned i = 0, e = Elements.size(); i != e; ++i) { |
| 255 | llvm::Constant *C = Elements[i]; |
| 256 | |
| 257 | unsigned ElementAlign = |
| 258 | CGM.getTargetData().getABITypeAlignment(C->getType()); |
| 259 | uint64_t AlignedElementOffsetInBytes = |
| 260 | llvm::RoundUpToAlignment(ElementOffsetInBytes, ElementAlign); |
| 261 | |
| 262 | if (AlignedElementOffsetInBytes > ElementOffsetInBytes) { |
| 263 | // We need some padding. |
| 264 | uint64_t NumBytes = |
| 265 | AlignedElementOffsetInBytes - ElementOffsetInBytes; |
| 266 | |
Eli Friedman | 64241fc | 2009-11-13 21:23:46 +0000 | [diff] [blame] | 267 | const llvm::Type *Ty = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 268 | if (NumBytes > 1) |
| 269 | Ty = llvm::ArrayType::get(Ty, NumBytes); |
| 270 | |
Nuno Lopes | c6eb131 | 2009-10-29 11:27:06 +0000 | [diff] [blame] | 271 | llvm::Constant *Padding = llvm::UndefValue::get(Ty); |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 272 | PackedElements.push_back(Padding); |
| 273 | ElementOffsetInBytes += getSizeInBytes(Padding); |
| 274 | } |
| 275 | |
| 276 | PackedElements.push_back(C); |
| 277 | ElementOffsetInBytes += getSizeInBytes(C); |
| 278 | } |
| 279 | |
| 280 | assert(ElementOffsetInBytes == NextFieldOffsetInBytes && |
| 281 | "Packing the struct changed its size!"); |
| 282 | |
| 283 | Elements = PackedElements; |
| 284 | LLVMStructAlignment = 1; |
| 285 | Packed = true; |
| 286 | } |
| 287 | |
Eli Friedman | c0879bb | 2009-08-01 23:11:24 +0000 | [diff] [blame] | 288 | bool Build(InitListExpr *ILE) { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 289 | RecordDecl *RD = ILE->getType()->getAs<RecordType>()->getDecl(); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 290 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 291 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 292 | unsigned FieldNo = 0; |
| 293 | unsigned ElementNo = 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 294 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
| 295 | FieldEnd = RD->field_end(); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 296 | ElementNo < ILE->getNumInits() && Field != FieldEnd; |
| 297 | ++Field, ++FieldNo) { |
Eli Friedman | c0879bb | 2009-08-01 23:11:24 +0000 | [diff] [blame] | 298 | if (RD->isUnion() && ILE->getInitializedFieldInUnion() != *Field) |
| 299 | continue; |
| 300 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 301 | if (Field->isBitField()) { |
| 302 | if (!Field->getIdentifier()) |
| 303 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 304 | |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 305 | if (!AppendBitField(*Field, Layout.getFieldOffset(FieldNo), |
| 306 | ILE->getInit(ElementNo))) |
| 307 | return false; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 308 | } else { |
| 309 | if (!AppendField(*Field, Layout.getFieldOffset(FieldNo), |
| 310 | ILE->getInit(ElementNo))) |
| 311 | return false; |
| 312 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 313 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 314 | ElementNo++; |
| 315 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 316 | |
Anders Carlsson | 4257bc6 | 2009-07-25 00:24:56 +0000 | [diff] [blame] | 317 | uint64_t LayoutSizeInBytes = Layout.getSize() / 8; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 318 | |
Anders Carlsson | 4257bc6 | 2009-07-25 00:24:56 +0000 | [diff] [blame] | 319 | if (NextFieldOffsetInBytes > LayoutSizeInBytes) { |
| 320 | // If the struct is bigger than the size of the record type, |
| 321 | // we must have a flexible array member at the end. |
| 322 | assert(RD->hasFlexibleArrayMember() && |
| 323 | "Must have flexible array member if struct is bigger than type!"); |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 324 | |
Anders Carlsson | 4257bc6 | 2009-07-25 00:24:56 +0000 | [diff] [blame] | 325 | // No tail padding is necessary. |
| 326 | return true; |
| 327 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 328 | |
Anders Carlsson | 31f2f9c | 2009-10-02 02:15:20 +0000 | [diff] [blame] | 329 | uint64_t LLVMSizeInBytes = llvm::RoundUpToAlignment(NextFieldOffsetInBytes, |
| 330 | LLVMStructAlignment); |
| 331 | |
| 332 | // Check if we need to convert the struct to a packed struct. |
| 333 | if (NextFieldOffsetInBytes <= LayoutSizeInBytes && |
| 334 | LLVMSizeInBytes > LayoutSizeInBytes) { |
| 335 | assert(!Packed && "Size mismatch!"); |
| 336 | |
| 337 | ConvertStructToPacked(); |
| 338 | assert(NextFieldOffsetInBytes == LayoutSizeInBytes && |
| 339 | "Converting to packed did not help!"); |
| 340 | } |
| 341 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 342 | // Append tail padding if necessary. |
| 343 | AppendTailPadding(Layout.getSize()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 344 | |
| 345 | assert(Layout.getSize() / 8 == NextFieldOffsetInBytes && |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 346 | "Tail padding mismatch!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 347 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 348 | return true; |
| 349 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 350 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 351 | unsigned getAlignment(const llvm::Constant *C) const { |
| 352 | if (Packed) |
| 353 | return 1; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 354 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 355 | return CGM.getTargetData().getABITypeAlignment(C->getType()); |
| 356 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 357 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 358 | uint64_t getSizeInBytes(const llvm::Constant *C) const { |
| 359 | return CGM.getTargetData().getTypeAllocSize(C->getType()); |
| 360 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 361 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 362 | public: |
| 363 | static llvm::Constant *BuildStruct(CodeGenModule &CGM, CodeGenFunction *CGF, |
Eli Friedman | c0879bb | 2009-08-01 23:11:24 +0000 | [diff] [blame] | 364 | InitListExpr *ILE) { |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 365 | ConstStructBuilder Builder(CGM, CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 366 | |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 367 | if (!Builder.Build(ILE)) |
| 368 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 369 | |
| 370 | llvm::Constant *Result = |
Daniel Dunbar | a10f7ea | 2009-08-06 01:24:27 +0000 | [diff] [blame] | 371 | llvm::ConstantStruct::get(CGM.getLLVMContext(), |
Owen Anderson | 47a434f | 2009-08-05 23:18:46 +0000 | [diff] [blame] | 372 | Builder.Elements, Builder.Packed); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 373 | |
Anders Carlsson | 4257bc6 | 2009-07-25 00:24:56 +0000 | [diff] [blame] | 374 | assert(llvm::RoundUpToAlignment(Builder.NextFieldOffsetInBytes, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 375 | Builder.getAlignment(Result)) == |
Anders Carlsson | 4257bc6 | 2009-07-25 00:24:56 +0000 | [diff] [blame] | 376 | Builder.getSizeInBytes(Result) && "Size mismatch!"); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 377 | |
Anders Carlsson | 5602719 | 2009-07-24 18:20:38 +0000 | [diff] [blame] | 378 | return Result; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 379 | } |
| 380 | }; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 381 | |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 382 | class ConstExprEmitter : |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 383 | public StmtVisitor<ConstExprEmitter, llvm::Constant*> { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 384 | CodeGenModule &CGM; |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 385 | CodeGenFunction *CGF; |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 386 | llvm::LLVMContext &VMContext; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 387 | public: |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 388 | ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 389 | : CGM(cgm), CGF(cgf), VMContext(cgm.getLLVMContext()) { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 390 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 391 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 392 | //===--------------------------------------------------------------------===// |
| 393 | // Visitor Methods |
| 394 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 395 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 396 | llvm::Constant *VisitStmt(Stmt *S) { |
Anders Carlsson | 069880e | 2009-03-03 16:43:34 +0000 | [diff] [blame] | 397 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 398 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 399 | |
| 400 | llvm::Constant *VisitParenExpr(ParenExpr *PE) { |
| 401 | return Visit(PE->getSubExpr()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 402 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 403 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 404 | llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
| 405 | return Visit(E->getInitializer()); |
| 406 | } |
Chris Lattner | 3ae9f48 | 2009-10-13 07:14:16 +0000 | [diff] [blame] | 407 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 408 | llvm::Constant *EmitMemberFunctionPointer(CXXMethodDecl *MD) { |
| 409 | assert(MD->isInstance() && "Member function must not be static!"); |
| 410 | |
Anders Carlsson | 7af4ec7 | 2010-01-05 05:04:05 +0000 | [diff] [blame] | 411 | MD = MD->getCanonicalDecl(); |
| 412 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 413 | const llvm::Type *PtrDiffTy = |
| 414 | CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType()); |
| 415 | |
| 416 | llvm::Constant *Values[2]; |
| 417 | |
| 418 | // Get the function pointer (or index if this is a virtual function). |
| 419 | if (MD->isVirtual()) { |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 420 | uint64_t Index = CGM.getVtableInfo().getMethodVtableIndex(MD); |
Anders Carlsson | e8a81f7 | 2010-02-04 16:38:05 +0000 | [diff] [blame^] | 421 | |
| 422 | // Itanium C++ ABI 2.3: |
| 423 | // For a non-virtual function, this field is a simple function pointer. |
| 424 | // For a virtual function, it is 1 plus the virtual table offset |
| 425 | // (in bytes) of the function, represented as a ptrdiff_t. |
Anders Carlsson | d6b07fb | 2009-11-27 20:47:55 +0000 | [diff] [blame] | 426 | Values[0] = llvm::ConstantInt::get(PtrDiffTy, (Index * 8) + 1); |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 427 | } else { |
| 428 | llvm::Constant *FuncPtr = CGM.GetAddrOfFunction(MD); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 429 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 430 | Values[0] = llvm::ConstantExpr::getPtrToInt(FuncPtr, PtrDiffTy); |
| 431 | } |
| 432 | |
| 433 | // The adjustment will always be 0. |
| 434 | Values[1] = llvm::ConstantInt::get(PtrDiffTy, 0); |
| 435 | |
| 436 | return llvm::ConstantStruct::get(CGM.getLLVMContext(), |
| 437 | Values, 2, /*Packed=*/false); |
| 438 | } |
| 439 | |
| 440 | llvm::Constant *VisitUnaryAddrOf(UnaryOperator *E) { |
| 441 | if (const MemberPointerType *MPT = |
| 442 | E->getType()->getAs<MemberPointerType>()) { |
| 443 | QualType T = MPT->getPointeeType(); |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 444 | DeclRefExpr *DRE = cast<DeclRefExpr>(E->getSubExpr()); |
| 445 | |
| 446 | NamedDecl *ND = DRE->getDecl(); |
| 447 | if (T->isFunctionProtoType()) |
| 448 | return EmitMemberFunctionPointer(cast<CXXMethodDecl>(ND)); |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 449 | |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 450 | // We have a pointer to data member. |
| 451 | return CGM.EmitPointerToDataMember(cast<FieldDecl>(ND)); |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 452 | } |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 453 | |
Anders Carlsson | f57b4e4 | 2009-10-03 15:02:02 +0000 | [diff] [blame] | 454 | return 0; |
| 455 | } |
| 456 | |
Chris Lattner | 3ae9f48 | 2009-10-13 07:14:16 +0000 | [diff] [blame] | 457 | llvm::Constant *VisitBinSub(BinaryOperator *E) { |
| 458 | // This must be a pointer/pointer subtraction. This only happens for |
| 459 | // address of label. |
| 460 | if (!isa<AddrLabelExpr>(E->getLHS()->IgnoreParenNoopCasts(CGM.getContext())) || |
| 461 | !isa<AddrLabelExpr>(E->getRHS()->IgnoreParenNoopCasts(CGM.getContext()))) |
| 462 | return 0; |
| 463 | |
| 464 | llvm::Constant *LHS = CGM.EmitConstantExpr(E->getLHS(), |
| 465 | E->getLHS()->getType(), CGF); |
| 466 | llvm::Constant *RHS = CGM.EmitConstantExpr(E->getRHS(), |
| 467 | E->getRHS()->getType(), CGF); |
| 468 | |
| 469 | const llvm::Type *ResultType = ConvertType(E->getType()); |
| 470 | LHS = llvm::ConstantExpr::getPtrToInt(LHS, ResultType); |
| 471 | RHS = llvm::ConstantExpr::getPtrToInt(RHS, ResultType); |
| 472 | |
| 473 | // No need to divide by element size, since addr of label is always void*, |
| 474 | // which has size 1 in GNUish. |
| 475 | return llvm::ConstantExpr::getSub(LHS, RHS); |
| 476 | } |
| 477 | |
Argyrios Kyrtzidis | 0835a3c | 2008-08-18 23:01:59 +0000 | [diff] [blame] | 478 | llvm::Constant *VisitCastExpr(CastExpr* E) { |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 479 | switch (E->getCastKind()) { |
| 480 | case CastExpr::CK_ToUnion: { |
| 481 | // GCC cast to union extension |
| 482 | assert(E->getType()->isUnionType() && |
| 483 | "Destination type is not union type!"); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 484 | const llvm::Type *Ty = ConvertType(E->getType()); |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 485 | Expr *SubExpr = E->getSubExpr(); |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 486 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 487 | llvm::Constant *C = |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 488 | CGM.EmitConstantExpr(SubExpr, SubExpr->getType(), CGF); |
| 489 | if (!C) |
| 490 | return 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 491 | |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 492 | // Build a struct with the union sub-element as the first member, |
| 493 | // and padded to the appropriate size |
| 494 | std::vector<llvm::Constant*> Elts; |
| 495 | std::vector<const llvm::Type*> Types; |
| 496 | Elts.push_back(C); |
| 497 | Types.push_back(C->getType()); |
| 498 | unsigned CurSize = CGM.getTargetData().getTypeAllocSize(C->getType()); |
| 499 | unsigned TotalSize = CGM.getTargetData().getTypeAllocSize(Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 500 | |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 501 | assert(CurSize <= TotalSize && "Union size mismatch!"); |
| 502 | if (unsigned NumPadBytes = TotalSize - CurSize) { |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 503 | const llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 504 | if (NumPadBytes > 1) |
| 505 | Ty = llvm::ArrayType::get(Ty, NumPadBytes); |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 506 | |
Nuno Lopes | c6eb131 | 2009-10-29 11:27:06 +0000 | [diff] [blame] | 507 | Elts.push_back(llvm::UndefValue::get(Ty)); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 508 | Types.push_back(Ty); |
| 509 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 510 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 511 | llvm::StructType* STy = |
| 512 | llvm::StructType::get(C->getType()->getContext(), Types, false); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 513 | return llvm::ConstantStruct::get(STy, Elts); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 514 | } |
Anders Carlsson | d1a9bac | 2009-08-23 00:02:11 +0000 | [diff] [blame] | 515 | case CastExpr::CK_NullToMemberPointer: |
| 516 | return CGM.EmitNullConstant(E->getType()); |
Anders Carlsson | 2c51f09 | 2009-10-03 15:13:22 +0000 | [diff] [blame] | 517 | |
| 518 | case CastExpr::CK_BaseToDerivedMemberPointer: { |
| 519 | Expr *SubExpr = E->getSubExpr(); |
| 520 | |
| 521 | const MemberPointerType *SrcTy = |
| 522 | SubExpr->getType()->getAs<MemberPointerType>(); |
| 523 | const MemberPointerType *DestTy = |
| 524 | E->getType()->getAs<MemberPointerType>(); |
| 525 | |
| 526 | const CXXRecordDecl *BaseClass = |
| 527 | cast<CXXRecordDecl>(cast<RecordType>(SrcTy->getClass())->getDecl()); |
| 528 | const CXXRecordDecl *DerivedClass = |
| 529 | cast<CXXRecordDecl>(cast<RecordType>(DestTy->getClass())->getDecl()); |
| 530 | |
| 531 | if (SrcTy->getPointeeType()->isFunctionProtoType()) { |
| 532 | llvm::Constant *C = |
| 533 | CGM.EmitConstantExpr(SubExpr, SubExpr->getType(), CGF); |
| 534 | if (!C) |
| 535 | return 0; |
| 536 | |
| 537 | llvm::ConstantStruct *CS = cast<llvm::ConstantStruct>(C); |
| 538 | |
| 539 | // Check if we need to update the adjustment. |
Anders Carlsson | bb7e17b | 2010-01-31 01:36:53 +0000 | [diff] [blame] | 540 | if (llvm::Constant *Offset = |
| 541 | CGM.GetNonVirtualBaseClassOffset(DerivedClass, BaseClass)) { |
Anders Carlsson | 2c51f09 | 2009-10-03 15:13:22 +0000 | [diff] [blame] | 542 | llvm::Constant *Values[2]; |
| 543 | |
| 544 | Values[0] = CS->getOperand(0); |
| 545 | Values[1] = llvm::ConstantExpr::getAdd(CS->getOperand(1), Offset); |
| 546 | return llvm::ConstantStruct::get(CGM.getLLVMContext(), Values, 2, |
| 547 | /*Packed=*/false); |
| 548 | } |
| 549 | |
| 550 | return CS; |
| 551 | } |
| 552 | } |
Anders Carlsson | bb378cb | 2009-10-18 20:31:03 +0000 | [diff] [blame] | 553 | |
| 554 | case CastExpr::CK_BitCast: |
| 555 | // This must be a member function pointer cast. |
| 556 | return Visit(E->getSubExpr()); |
| 557 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 558 | default: { |
| 559 | // FIXME: This should be handled by the CK_NoOp cast kind. |
| 560 | // Explicit and implicit no-op casts |
| 561 | QualType Ty = E->getType(), SubTy = E->getSubExpr()->getType(); |
| 562 | if (CGM.getContext().hasSameUnqualifiedType(Ty, SubTy)) |
Chris Lattner | 430656e | 2009-10-13 22:12:09 +0000 | [diff] [blame] | 563 | return Visit(E->getSubExpr()); |
| 564 | |
| 565 | // Handle integer->integer casts for address-of-label differences. |
| 566 | if (Ty->isIntegerType() && SubTy->isIntegerType() && |
| 567 | CGF) { |
| 568 | llvm::Value *Src = Visit(E->getSubExpr()); |
| 569 | if (Src == 0) return 0; |
| 570 | |
| 571 | // Use EmitScalarConversion to perform the conversion. |
| 572 | return cast<llvm::Constant>(CGF->EmitScalarConversion(Src, SubTy, Ty)); |
| 573 | } |
| 574 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 575 | return 0; |
Eli Friedman | ddd2b6e | 2009-02-22 07:29:04 +0000 | [diff] [blame] | 576 | } |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 577 | } |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 578 | } |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 579 | |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 580 | llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 581 | return Visit(DAE->getExpr()); |
| 582 | } |
| 583 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 584 | llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) { |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 585 | std::vector<llvm::Constant*> Elts; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 586 | const llvm::ArrayType *AType = |
| 587 | cast<llvm::ArrayType>(ConvertType(ILE->getType())); |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 588 | unsigned NumInitElements = ILE->getNumInits(); |
| 589 | // FIXME: Check for wide strings |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 590 | // FIXME: Check for NumInitElements exactly equal to 1?? |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 591 | if (NumInitElements > 0 && |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 592 | (isa<StringLiteral>(ILE->getInit(0)) || |
| 593 | isa<ObjCEncodeExpr>(ILE->getInit(0))) && |
Chris Lattner | c63a1f2 | 2008-08-04 07:31:14 +0000 | [diff] [blame] | 594 | ILE->getType()->getArrayElementTypeNoTypeQual()->isCharType()) |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 595 | return Visit(ILE->getInit(0)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 596 | const llvm::Type *ElemTy = AType->getElementType(); |
| 597 | unsigned NumElements = AType->getNumElements(); |
| 598 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 599 | // Initialising an array requires us to automatically |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 600 | // initialise any elements that have not been initialised explicitly |
| 601 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 602 | |
| 603 | // Copy initializer elements. |
| 604 | unsigned i = 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 605 | bool RewriteType = false; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 606 | for (; i < NumInitableElts; ++i) { |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 607 | Expr *Init = ILE->getInit(i); |
| 608 | llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 609 | if (!C) |
| 610 | return 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 611 | RewriteType |= (C->getType() != ElemTy); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 612 | Elts.push_back(C); |
| 613 | } |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 614 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 615 | // Initialize remaining array elements. |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 616 | // FIXME: This doesn't handle member pointers correctly! |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 617 | for (; i < NumElements; ++i) |
Owen Anderson | c9c88b4 | 2009-07-31 20:28:54 +0000 | [diff] [blame] | 618 | Elts.push_back(llvm::Constant::getNullValue(ElemTy)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 619 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 620 | if (RewriteType) { |
| 621 | // FIXME: Try to avoid packing the array |
| 622 | std::vector<const llvm::Type*> Types; |
| 623 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 624 | Types.push_back(Elts[i]->getType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 625 | const llvm::StructType *SType = llvm::StructType::get(AType->getContext(), |
Owen Anderson | 47a434f | 2009-08-05 23:18:46 +0000 | [diff] [blame] | 626 | Types, true); |
Owen Anderson | 08e2524 | 2009-07-27 22:29:56 +0000 | [diff] [blame] | 627 | return llvm::ConstantStruct::get(SType, Elts); |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 628 | } |
| 629 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 630 | return llvm::ConstantArray::get(AType, Elts); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 631 | } |
| 632 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 633 | llvm::Constant *EmitStructInitialization(InitListExpr *ILE) { |
Anders Carlsson | 8dca3b3 | 2009-07-27 05:54:15 +0000 | [diff] [blame] | 634 | return ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 635 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 636 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 637 | llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) { |
Anders Carlsson | f6c4396 | 2009-07-31 21:34:04 +0000 | [diff] [blame] | 638 | return ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 639 | } |
| 640 | |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 641 | llvm::Constant *VisitImplicitValueInitExpr(ImplicitValueInitExpr* E) { |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 642 | return CGM.EmitNullConstant(E->getType()); |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 643 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 644 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 645 | llvm::Constant *VisitInitListExpr(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 646 | if (ILE->getType()->isScalarType()) { |
| 647 | // We have a scalar in braces. Just use the first element. |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 648 | if (ILE->getNumInits() > 0) { |
| 649 | Expr *Init = ILE->getInit(0); |
| 650 | return CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
| 651 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 652 | return CGM.EmitNullConstant(ILE->getType()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 653 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 654 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 655 | if (ILE->getType()->isArrayType()) |
| 656 | return EmitArrayInitialization(ILE); |
Devang Patel | 47fb697 | 2008-01-29 23:23:18 +0000 | [diff] [blame] | 657 | |
Anders Carlsson | 01a79ac | 2009-11-21 23:56:04 +0000 | [diff] [blame] | 658 | if (ILE->getType()->isRecordType()) |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 659 | return EmitStructInitialization(ILE); |
| 660 | |
| 661 | if (ILE->getType()->isUnionType()) |
| 662 | return EmitUnionInitialization(ILE); |
| 663 | |
Eli Friedman | 8ac5549 | 2010-01-02 23:43:59 +0000 | [diff] [blame] | 664 | // If ILE was a constant vector, we would have handled it already. |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 665 | if (ILE->getType()->isVectorType()) |
Eli Friedman | 8ac5549 | 2010-01-02 23:43:59 +0000 | [diff] [blame] | 666 | return 0; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 667 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 668 | assert(0 && "Unable to handle InitListExpr"); |
Chris Lattner | 2b94fe3 | 2008-03-01 08:45:05 +0000 | [diff] [blame] | 669 | // Get rid of control reaches end of void function warning. |
| 670 | // Not reached. |
| 671 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 672 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 673 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 674 | llvm::Constant *VisitCXXConstructExpr(CXXConstructExpr *E) { |
| 675 | if (!E->getConstructor()->isTrivial()) |
| 676 | return 0; |
| 677 | |
| 678 | // Only copy and default constructors can be trivial. |
| 679 | |
| 680 | QualType Ty = E->getType(); |
| 681 | |
| 682 | if (E->getNumArgs()) { |
| 683 | assert(E->getNumArgs() == 1 && "trivial ctor with > 1 argument"); |
| 684 | assert(E->getConstructor()->isCopyConstructor() && |
| 685 | "trivial ctor has argument but isn't a copy ctor"); |
| 686 | |
| 687 | Expr *Arg = E->getArg(0); |
| 688 | assert(CGM.getContext().hasSameUnqualifiedType(Ty, Arg->getType()) && |
| 689 | "argument to copy ctor is of wrong type"); |
| 690 | |
Chandler Carruth | 878b55c | 2010-02-02 12:15:55 +0000 | [diff] [blame] | 691 | return Visit(Arg); |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | return CGM.EmitNullConstant(Ty); |
| 695 | } |
| 696 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 697 | llvm::Constant *VisitStringLiteral(StringLiteral *E) { |
Chris Lattner | a7ad98f | 2008-02-11 00:02:17 +0000 | [diff] [blame] | 698 | assert(!E->getType()->isPointerType() && "Strings are always arrays"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 699 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 700 | // This must be a string initializing an array in a static initializer. |
| 701 | // Don't emit it as the address of the string, emit the string data itself |
| 702 | // as an inline array. |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 703 | return llvm::ConstantArray::get(VMContext, |
| 704 | CGM.GetStringForStringLiteral(E), false); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 705 | } |
| 706 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 707 | llvm::Constant *VisitObjCEncodeExpr(ObjCEncodeExpr *E) { |
| 708 | // This must be an @encode initializing an array in a static initializer. |
| 709 | // Don't emit it as the address of the string, emit the string data itself |
| 710 | // as an inline array. |
| 711 | std::string Str; |
| 712 | CGM.getContext().getObjCEncodingForType(E->getEncodedType(), Str); |
| 713 | const ConstantArrayType *CAT = cast<ConstantArrayType>(E->getType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 714 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 715 | // Resize the string to the right size, adding zeros at the end, or |
| 716 | // truncating as needed. |
| 717 | Str.resize(CAT->getSize().getZExtValue(), '\0'); |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 718 | return llvm::ConstantArray::get(VMContext, Str, false); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 719 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 720 | |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 721 | llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) { |
| 722 | return Visit(E->getSubExpr()); |
| 723 | } |
Mike Stump | b83d287 | 2009-02-19 22:01:56 +0000 | [diff] [blame] | 724 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 725 | // Utility methods |
| 726 | const llvm::Type *ConvertType(QualType T) { |
| 727 | return CGM.getTypes().ConvertType(T); |
| 728 | } |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 729 | |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 730 | public: |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 731 | llvm::Constant *EmitLValue(Expr *E) { |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 732 | switch (E->getStmtClass()) { |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 733 | default: break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 734 | case Expr::CompoundLiteralExprClass: { |
| 735 | // Note that due to the nature of compound literals, this is guaranteed |
| 736 | // 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] | 737 | CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); |
| 738 | llvm::Constant* C = Visit(CLE->getInitializer()); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 739 | // FIXME: "Leaked" on failure. |
| 740 | if (C) |
Owen Anderson | 1c431b3 | 2009-07-08 19:05:04 +0000 | [diff] [blame] | 741 | C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), |
Eli Friedman | d15d8c6 | 2009-08-26 20:01:39 +0000 | [diff] [blame] | 742 | E->getType().isConstant(CGM.getContext()), |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 743 | llvm::GlobalValue::InternalLinkage, |
Eli Friedman | d15d8c6 | 2009-08-26 20:01:39 +0000 | [diff] [blame] | 744 | C, ".compoundliteral", 0, false, |
| 745 | E->getType().getAddressSpace()); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 746 | return C; |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 747 | } |
Douglas Gregor | a2813ce | 2009-10-23 18:54:35 +0000 | [diff] [blame] | 748 | case Expr::DeclRefExprClass: { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 749 | NamedDecl *Decl = cast<DeclRefExpr>(E)->getDecl(); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 750 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl)) |
Anders Carlsson | 555b4bb | 2009-09-10 23:43:36 +0000 | [diff] [blame] | 751 | return CGM.GetAddrOfFunction(FD); |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 752 | if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 753 | // We can never refer to a variable with local storage. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 754 | if (!VD->hasLocalStorage()) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 755 | if (VD->isFileVarDecl() || VD->hasExternalStorage()) |
| 756 | return CGM.GetAddrOfGlobalVar(VD); |
| 757 | else if (VD->isBlockVarDecl()) { |
| 758 | assert(CGF && "Can't access static local vars without CGF"); |
| 759 | return CGF->GetAddrOfStaticLocalVar(VD); |
| 760 | } |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 761 | } |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 762 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 763 | break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 764 | } |
Daniel Dunbar | 6143293 | 2008-08-13 23:20:05 +0000 | [diff] [blame] | 765 | case Expr::StringLiteralClass: |
| 766 | return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E)); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 767 | case Expr::ObjCEncodeExprClass: |
| 768 | return CGM.GetAddrOfConstantStringFromObjCEncode(cast<ObjCEncodeExpr>(E)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 769 | case Expr::ObjCStringLiteralClass: { |
| 770 | ObjCStringLiteral* SL = cast<ObjCStringLiteral>(E); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 771 | llvm::Constant *C = |
| 772 | CGM.getObjCRuntime().GenerateConstantString(SL->getString()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 773 | return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType())); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 774 | } |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 775 | case Expr::PredefinedExprClass: { |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 776 | unsigned Type = cast<PredefinedExpr>(E)->getIdentType(); |
| 777 | if (CGF) { |
| 778 | LValue Res = CGF->EmitPredefinedFunctionName(Type); |
| 779 | return cast<llvm::Constant>(Res.getAddress()); |
| 780 | } else if (Type == PredefinedExpr::PrettyFunction) { |
| 781 | return CGM.GetAddrOfConstantCString("top level", ".tmp"); |
| 782 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 783 | |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 784 | return CGM.GetAddrOfConstantCString("", ".tmp"); |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 785 | } |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 786 | case Expr::AddrLabelExprClass: { |
| 787 | assert(CGF && "Invalid address of label expression outside function."); |
Chris Lattner | d9becd1 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 788 | llvm::Constant *Ptr = |
| 789 | CGF->GetAddrOfLabel(cast<AddrLabelExpr>(E)->getLabel()); |
| 790 | return llvm::ConstantExpr::getBitCast(Ptr, ConvertType(E->getType())); |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 791 | } |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 792 | case Expr::CallExprClass: { |
| 793 | CallExpr* CE = cast<CallExpr>(E); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 794 | unsigned builtin = CE->isBuiltinCall(CGM.getContext()); |
| 795 | if (builtin != |
| 796 | Builtin::BI__builtin___CFStringMakeConstantString && |
| 797 | builtin != |
| 798 | Builtin::BI__builtin___NSStringMakeConstantString) |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 799 | break; |
| 800 | const Expr *Arg = CE->getArg(0)->IgnoreParenCasts(); |
| 801 | const StringLiteral *Literal = cast<StringLiteral>(Arg); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 802 | if (builtin == |
| 803 | Builtin::BI__builtin___NSStringMakeConstantString) { |
| 804 | return CGM.getObjCRuntime().GenerateConstantString(Literal); |
| 805 | } |
Steve Naroff | 33fdb73 | 2009-03-31 16:53:37 +0000 | [diff] [blame] | 806 | // FIXME: need to deal with UCN conversion issues. |
Steve Naroff | 8d4141f | 2009-04-01 13:55:36 +0000 | [diff] [blame] | 807 | return CGM.GetAddrOfConstantCFString(Literal); |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 808 | } |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 809 | case Expr::BlockExprClass: { |
Anders Carlsson | 4de9fce | 2009-03-01 01:09:12 +0000 | [diff] [blame] | 810 | std::string FunctionName; |
| 811 | if (CGF) |
| 812 | FunctionName = CGF->CurFn->getName(); |
| 813 | else |
| 814 | FunctionName = "global"; |
| 815 | |
| 816 | return CGM.GetAddrOfGlobalBlock(cast<BlockExpr>(E), FunctionName.c_str()); |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 817 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 818 | } |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 819 | |
| 820 | return 0; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 821 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 822 | }; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 823 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 824 | } // end anonymous namespace. |
| 825 | |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 826 | llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E, |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 827 | QualType DestType, |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 828 | CodeGenFunction *CGF) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 829 | Expr::EvalResult Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 830 | |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 831 | bool Success = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 832 | |
Eli Friedman | 50c39ea | 2009-05-27 06:04:58 +0000 | [diff] [blame] | 833 | if (DestType->isReferenceType()) |
| 834 | Success = E->EvaluateAsLValue(Result, Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 835 | else |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 836 | Success = E->Evaluate(Result, Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 837 | |
Eli Friedman | 55f9bdd | 2009-11-14 08:51:33 +0000 | [diff] [blame] | 838 | if (Success && !Result.HasSideEffects) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 839 | switch (Result.Val.getKind()) { |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 840 | case APValue::Uninitialized: |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 841 | assert(0 && "Constant expressions should be initialized."); |
| 842 | return 0; |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 843 | case APValue::LValue: { |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 844 | const llvm::Type *DestTy = getTypes().ConvertTypeForMem(DestType); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 845 | llvm::Constant *Offset = |
| 846 | llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), |
Ken Dyck | a730583 | 2010-01-15 12:37:54 +0000 | [diff] [blame] | 847 | Result.Val.getLValueOffset().getQuantity()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 848 | |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 849 | llvm::Constant *C; |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 850 | if (const Expr *LVBase = Result.Val.getLValueBase()) { |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 851 | C = ConstExprEmitter(*this, CGF).EmitLValue(const_cast<Expr*>(LVBase)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 852 | |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 853 | // Apply offset if necessary. |
| 854 | if (!Offset->isNullValue()) { |
Benjamin Kramer | 3c0ef8c | 2009-10-13 10:07:13 +0000 | [diff] [blame] | 855 | const llvm::Type *Type = llvm::Type::getInt8PtrTy(VMContext); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 856 | llvm::Constant *Casted = llvm::ConstantExpr::getBitCast(C, Type); |
| 857 | Casted = llvm::ConstantExpr::getGetElementPtr(Casted, &Offset, 1); |
| 858 | C = llvm::ConstantExpr::getBitCast(Casted, C->getType()); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | // Convert to the appropriate type; this could be an lvalue for |
| 862 | // an integer. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 863 | if (isa<llvm::PointerType>(DestTy)) |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 864 | return llvm::ConstantExpr::getBitCast(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 865 | |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 866 | return llvm::ConstantExpr::getPtrToInt(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 867 | } else { |
| 868 | C = Offset; |
| 869 | |
| 870 | // Convert to the appropriate type; this could be an lvalue for |
| 871 | // an integer. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 872 | if (isa<llvm::PointerType>(DestTy)) |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 873 | return llvm::ConstantExpr::getIntToPtr(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 874 | |
| 875 | // If the types don't match this should only be a truncate. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 876 | if (C->getType() != DestTy) |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 877 | return llvm::ConstantExpr::getTrunc(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 878 | |
| 879 | return C; |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 880 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 881 | } |
Eli Friedman | 7b30b1c | 2008-11-17 03:57:28 +0000 | [diff] [blame] | 882 | case APValue::Int: { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 883 | llvm::Constant *C = llvm::ConstantInt::get(VMContext, |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 884 | Result.Val.getInt()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 885 | |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 886 | if (C->getType() == llvm::Type::getInt1Ty(VMContext)) { |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 887 | const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 888 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 889 | } |
| 890 | return C; |
Eli Friedman | 7b30b1c | 2008-11-17 03:57:28 +0000 | [diff] [blame] | 891 | } |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 892 | case APValue::ComplexInt: { |
| 893 | llvm::Constant *Complex[2]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 894 | |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 895 | Complex[0] = llvm::ConstantInt::get(VMContext, |
| 896 | Result.Val.getComplexIntReal()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 897 | Complex[1] = llvm::ConstantInt::get(VMContext, |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 898 | Result.Val.getComplexIntImag()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 899 | |
Nick Lewycky | 0d36dd2 | 2009-09-19 20:00:52 +0000 | [diff] [blame] | 900 | // FIXME: the target may want to specify that this is packed. |
| 901 | return llvm::ConstantStruct::get(VMContext, Complex, 2, false); |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 902 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 903 | case APValue::Float: |
Owen Anderson | bc0a222 | 2009-07-27 21:00:51 +0000 | [diff] [blame] | 904 | return llvm::ConstantFP::get(VMContext, Result.Val.getFloat()); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 905 | case APValue::ComplexFloat: { |
| 906 | llvm::Constant *Complex[2]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 907 | |
| 908 | Complex[0] = llvm::ConstantFP::get(VMContext, |
Owen Anderson | bc0a222 | 2009-07-27 21:00:51 +0000 | [diff] [blame] | 909 | Result.Val.getComplexFloatReal()); |
| 910 | Complex[1] = llvm::ConstantFP::get(VMContext, |
| 911 | Result.Val.getComplexFloatImag()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 912 | |
Nick Lewycky | 0d36dd2 | 2009-09-19 20:00:52 +0000 | [diff] [blame] | 913 | // FIXME: the target may want to specify that this is packed. |
| 914 | return llvm::ConstantStruct::get(VMContext, Complex, 2, false); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 915 | } |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 916 | case APValue::Vector: { |
| 917 | llvm::SmallVector<llvm::Constant *, 4> Inits; |
| 918 | unsigned NumElts = Result.Val.getVectorLength(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 919 | |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 920 | for (unsigned i = 0; i != NumElts; ++i) { |
| 921 | APValue &Elt = Result.Val.getVectorElt(i); |
| 922 | if (Elt.isInt()) |
Owen Anderson | 4a28d5d | 2009-07-24 23:12:58 +0000 | [diff] [blame] | 923 | Inits.push_back(llvm::ConstantInt::get(VMContext, Elt.getInt())); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 924 | else |
Owen Anderson | bc0a222 | 2009-07-27 21:00:51 +0000 | [diff] [blame] | 925 | Inits.push_back(llvm::ConstantFP::get(VMContext, Elt.getFloat())); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 926 | } |
Owen Anderson | 4a28932 | 2009-07-28 21:22:35 +0000 | [diff] [blame] | 927 | return llvm::ConstantVector::get(&Inits[0], Inits.size()); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 928 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 929 | } |
| 930 | } |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 931 | |
| 932 | llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E)); |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 933 | if (C && C->getType() == llvm::Type::getInt1Ty(VMContext)) { |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 934 | const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 935 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 936 | } |
| 937 | return C; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 938 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 939 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 940 | static bool containsPointerToDataMember(CodeGenTypes &Types, QualType T) { |
| 941 | // No need to check for member pointers when not compiling C++. |
| 942 | if (!Types.getContext().getLangOptions().CPlusPlus) |
| 943 | return false; |
| 944 | |
| 945 | T = Types.getContext().getBaseElementType(T); |
| 946 | |
| 947 | if (const RecordType *RT = T->getAs<RecordType>()) { |
| 948 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 949 | |
| 950 | // FIXME: It would be better if there was a way to explicitly compute the |
| 951 | // record layout instead of converting to a type. |
| 952 | Types.ConvertTagDeclType(RD); |
| 953 | |
| 954 | const CGRecordLayout &Layout = Types.getCGRecordLayout(RD); |
| 955 | return Layout.containsPointerToDataMember(); |
| 956 | } |
| 957 | |
Anders Carlsson | e9d34dc | 2009-09-29 02:09:01 +0000 | [diff] [blame] | 958 | if (const MemberPointerType *MPT = T->getAs<MemberPointerType>()) |
| 959 | return !MPT->getPointeeType()->isFunctionType(); |
| 960 | |
| 961 | return false; |
| 962 | } |
| 963 | |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 964 | llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) { |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 965 | if (!containsPointerToDataMember(getTypes(), T)) |
Anders Carlsson | ad3e711 | 2009-08-24 17:16:23 +0000 | [diff] [blame] | 966 | return llvm::Constant::getNullValue(getTypes().ConvertTypeForMem(T)); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 967 | |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 968 | if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(T)) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 969 | |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 970 | QualType ElementTy = CAT->getElementType(); |
| 971 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 972 | llvm::Constant *Element = EmitNullConstant(ElementTy); |
| 973 | unsigned NumElements = CAT->getSize().getZExtValue(); |
| 974 | std::vector<llvm::Constant *> Array(NumElements); |
| 975 | for (unsigned i = 0; i != NumElements; ++i) |
| 976 | Array[i] = Element; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 977 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 978 | const llvm::ArrayType *ATy = |
| 979 | cast<llvm::ArrayType>(getTypes().ConvertTypeForMem(T)); |
| 980 | return llvm::ConstantArray::get(ATy, Array); |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 981 | } |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 982 | |
| 983 | if (const RecordType *RT = T->getAs<RecordType>()) { |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 984 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 985 | assert(!RD->getNumBases() && |
| 986 | "FIXME: Handle zero-initializing structs with bases and " |
| 987 | "pointers to data members."); |
| 988 | const llvm::StructType *STy = |
| 989 | cast<llvm::StructType>(getTypes().ConvertTypeForMem(T)); |
| 990 | unsigned NumElements = STy->getNumElements(); |
| 991 | std::vector<llvm::Constant *> Elements(NumElements); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 992 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 993 | for (RecordDecl::field_iterator I = RD->field_begin(), |
| 994 | E = RD->field_end(); I != E; ++I) { |
| 995 | const FieldDecl *FD = *I; |
| 996 | |
| 997 | unsigned FieldNo = getTypes().getLLVMFieldNo(FD); |
| 998 | Elements[FieldNo] = EmitNullConstant(FD->getType()); |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 999 | } |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1000 | |
| 1001 | // Now go through all other fields and zero them out. |
| 1002 | for (unsigned i = 0; i != NumElements; ++i) { |
| 1003 | if (!Elements[i]) |
| 1004 | Elements[i] = llvm::Constant::getNullValue(STy->getElementType(i)); |
| 1005 | } |
| 1006 | |
| 1007 | return llvm::ConstantStruct::get(STy, Elements); |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 1008 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1009 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1010 | assert(!T->getAs<MemberPointerType>()->getPointeeType()->isFunctionType() && |
| 1011 | "Should only see pointers to data members here!"); |
| 1012 | |
| 1013 | // Itanium C++ ABI 2.3: |
| 1014 | // A NULL pointer is represented as -1. |
| 1015 | return llvm::ConstantInt::get(getTypes().ConvertTypeForMem(T), -1, |
| 1016 | /*isSigned=*/true); |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 1017 | } |
Anders Carlsson | 45147d0 | 2010-02-02 03:37:46 +0000 | [diff] [blame] | 1018 | |
| 1019 | llvm::Constant * |
| 1020 | CodeGenModule::EmitPointerToDataMember(const FieldDecl *FD) { |
| 1021 | |
| 1022 | // Itanium C++ ABI 2.3: |
| 1023 | // A pointer to data member is an offset from the base address of the class |
| 1024 | // object containing it, represented as a ptrdiff_t |
| 1025 | |
| 1026 | const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(FD->getParent()); |
| 1027 | QualType ClassType = |
| 1028 | getContext().getTypeDeclType(const_cast<CXXRecordDecl *>(ClassDecl)); |
| 1029 | |
| 1030 | const llvm::StructType *ClassLTy = |
| 1031 | cast<llvm::StructType>(getTypes().ConvertType(ClassType)); |
| 1032 | |
| 1033 | unsigned FieldNo = getTypes().getLLVMFieldNo(FD); |
| 1034 | uint64_t Offset = |
| 1035 | getTargetData().getStructLayout(ClassLTy)->getElementOffset(FieldNo); |
| 1036 | |
| 1037 | const llvm::Type *PtrDiffTy = |
| 1038 | getTypes().ConvertType(getContext().getPointerDiffType()); |
| 1039 | |
| 1040 | return llvm::ConstantInt::get(PtrDiffTy, Offset); |
| 1041 | } |