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" |
John McCall | 4c40d98 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 16 | #include "CGCXXABI.h" |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame] | 17 | #include "CGObjCRuntime.h" |
Daniel Dunbar | 2924ade | 2010-03-30 22:26:10 +0000 | [diff] [blame] | 18 | #include "CGRecordLayout.h" |
Chris Lattner | f6b24ea | 2008-10-06 05:59:01 +0000 | [diff] [blame] | 19 | #include "clang/AST/APValue.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 20 | #include "clang/AST/ASTContext.h" |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 21 | #include "clang/AST/RecordLayout.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 22 | #include "clang/AST/StmtVisitor.h" |
Chris Lattner | 1b63e4f | 2009-06-14 01:54:56 +0000 | [diff] [blame] | 23 | #include "clang/Basic/Builtins.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 24 | #include "llvm/Constants.h" |
| 25 | #include "llvm/Function.h" |
| 26 | #include "llvm/GlobalVariable.h" |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 27 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 28 | using namespace clang; |
| 29 | using namespace CodeGen; |
| 30 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 31 | //===----------------------------------------------------------------------===// |
| 32 | // ConstStructBuilder |
| 33 | //===----------------------------------------------------------------------===// |
| 34 | |
| 35 | namespace { |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 36 | class ConstStructBuilder { |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 37 | CodeGenModule &CGM; |
| 38 | CodeGenFunction *CGF; |
| 39 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 40 | bool Packed; |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 41 | CharUnits NextFieldOffsetInChars; |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 42 | CharUnits LLVMStructAlignment; |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 43 | std::vector<llvm::Constant *> Elements; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 44 | public: |
| 45 | static llvm::Constant *BuildStruct(CodeGenModule &CGM, CodeGenFunction *CGF, |
| 46 | InitListExpr *ILE); |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 47 | static llvm::Constant *BuildStruct(CodeGenModule &CGM, CodeGenFunction *CGF, |
| 48 | const APValue &Value, QualType ValTy); |
| 49 | |
| 50 | private: |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 51 | ConstStructBuilder(CodeGenModule &CGM, CodeGenFunction *CGF) |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 52 | : CGM(CGM), CGF(CGF), Packed(false), |
| 53 | NextFieldOffsetInChars(CharUnits::Zero()), |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 54 | LLVMStructAlignment(CharUnits::One()) { } |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 55 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 56 | void AppendField(const FieldDecl *Field, uint64_t FieldOffset, |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 57 | llvm::Constant *InitExpr); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 58 | |
Chris Lattner | 1880666 | 2010-07-05 17:04:23 +0000 | [diff] [blame] | 59 | void AppendBitField(const FieldDecl *Field, uint64_t FieldOffset, |
| 60 | llvm::ConstantInt *InitExpr); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 61 | |
Ken Dyck | c29ea8f | 2011-03-11 23:42:54 +0000 | [diff] [blame] | 62 | void AppendPadding(CharUnits PadSize); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 63 | |
Ken Dyck | 106ca04 | 2011-03-11 02:17:05 +0000 | [diff] [blame] | 64 | void AppendTailPadding(CharUnits RecordSize); |
Anders Carlsson | d24393b | 2009-07-27 01:23:51 +0000 | [diff] [blame] | 65 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 66 | void ConvertStructToPacked(); |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 67 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 68 | bool Build(InitListExpr *ILE); |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 69 | void Build(const APValue &Val, QualType ValTy); |
| 70 | llvm::Constant *Finalize(QualType Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 71 | |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 72 | CharUnits getAlignment(const llvm::Constant *C) const { |
| 73 | if (Packed) return CharUnits::One(); |
| 74 | return CharUnits::fromQuantity( |
| 75 | CGM.getTargetData().getABITypeAlignment(C->getType())); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 76 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 77 | |
Ken Dyck | 15c152e | 2011-03-18 01:12:13 +0000 | [diff] [blame] | 78 | CharUnits getSizeInChars(const llvm::Constant *C) const { |
| 79 | return CharUnits::fromQuantity( |
| 80 | CGM.getTargetData().getTypeAllocSize(C->getType())); |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 81 | } |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame] | 82 | }; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 83 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 84 | void ConstStructBuilder:: |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 85 | AppendField(const FieldDecl *Field, uint64_t FieldOffset, |
| 86 | llvm::Constant *InitCst) { |
Ken Dyck | 6925cc4 | 2011-03-15 01:09:02 +0000 | [diff] [blame] | 87 | |
| 88 | const ASTContext &Context = CGM.getContext(); |
| 89 | |
| 90 | CharUnits FieldOffsetInChars = Context.toCharUnitsFromBits(FieldOffset); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 91 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 92 | assert(NextFieldOffsetInChars <= FieldOffsetInChars |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 93 | && "Field offset mismatch!"); |
| 94 | |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 95 | CharUnits FieldAlignment = getAlignment(InitCst); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 96 | |
| 97 | // Round up the field offset to the alignment of the field type. |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 98 | CharUnits AlignedNextFieldOffsetInChars = |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 99 | NextFieldOffsetInChars.RoundUpToAlignment(FieldAlignment); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 100 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 101 | if (AlignedNextFieldOffsetInChars > FieldOffsetInChars) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 102 | assert(!Packed && "Alignment is wrong even with a packed struct!"); |
| 103 | |
| 104 | // Convert the struct to a packed struct. |
| 105 | ConvertStructToPacked(); |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 106 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 107 | AlignedNextFieldOffsetInChars = NextFieldOffsetInChars; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 108 | } |
| 109 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 110 | if (AlignedNextFieldOffsetInChars < FieldOffsetInChars) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 111 | // We need to append padding. |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 112 | AppendPadding(FieldOffsetInChars - NextFieldOffsetInChars); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 113 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 114 | assert(NextFieldOffsetInChars == FieldOffsetInChars && |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 115 | "Did not add enough padding!"); |
| 116 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 117 | AlignedNextFieldOffsetInChars = NextFieldOffsetInChars; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | // Add the field. |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 121 | Elements.push_back(InitCst); |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 122 | NextFieldOffsetInChars = AlignedNextFieldOffsetInChars + |
Ken Dyck | 15c152e | 2011-03-18 01:12:13 +0000 | [diff] [blame] | 123 | getSizeInChars(InitCst); |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 124 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 125 | if (Packed) |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 126 | assert(LLVMStructAlignment == CharUnits::One() && |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 127 | "Packed struct not byte-aligned!"); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 128 | else |
| 129 | LLVMStructAlignment = std::max(LLVMStructAlignment, FieldAlignment); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 130 | } |
| 131 | |
Chris Lattner | 1880666 | 2010-07-05 17:04:23 +0000 | [diff] [blame] | 132 | void ConstStructBuilder::AppendBitField(const FieldDecl *Field, |
| 133 | uint64_t FieldOffset, |
| 134 | llvm::ConstantInt *CI) { |
Ken Dyck | f004da4 | 2011-03-12 12:03:11 +0000 | [diff] [blame] | 135 | const ASTContext &Context = CGM.getContext(); |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 136 | const uint64_t CharWidth = Context.getCharWidth(); |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 137 | uint64_t NextFieldOffsetInBits = Context.toBits(NextFieldOffsetInChars); |
| 138 | if (FieldOffset > NextFieldOffsetInBits) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 139 | // We need to add padding. |
Ken Dyck | f004da4 | 2011-03-12 12:03:11 +0000 | [diff] [blame] | 140 | CharUnits PadSize = Context.toCharUnitsFromBits( |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 141 | llvm::RoundUpToAlignment(FieldOffset - NextFieldOffsetInBits, |
Douglas Gregor | bcfd1f5 | 2011-09-02 00:18:52 +0000 | [diff] [blame] | 142 | Context.getTargetInfo().getCharAlign())); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 143 | |
Ken Dyck | f004da4 | 2011-03-12 12:03:11 +0000 | [diff] [blame] | 144 | AppendPadding(PadSize); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 145 | } |
| 146 | |
Richard Smith | a6b8b2c | 2011-10-10 18:28:20 +0000 | [diff] [blame] | 147 | uint64_t FieldSize = Field->getBitWidthValue(Context); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 148 | |
| 149 | llvm::APInt FieldValue = CI->getValue(); |
| 150 | |
| 151 | // Promote the size of FieldValue if necessary |
| 152 | // FIXME: This should never occur, but currently it can because initializer |
| 153 | // constants are cast to bool, and because clang is not enforcing bitfield |
| 154 | // width limits. |
| 155 | if (FieldSize > FieldValue.getBitWidth()) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 156 | FieldValue = FieldValue.zext(FieldSize); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 157 | |
| 158 | // Truncate the size of FieldValue to the bit field size. |
| 159 | if (FieldSize < FieldValue.getBitWidth()) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 160 | FieldValue = FieldValue.trunc(FieldSize); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 161 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 162 | NextFieldOffsetInBits = Context.toBits(NextFieldOffsetInChars); |
| 163 | if (FieldOffset < NextFieldOffsetInBits) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 164 | // Either part of the field or the entire field can go into the previous |
| 165 | // byte. |
| 166 | assert(!Elements.empty() && "Elements can't be empty!"); |
| 167 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 168 | unsigned BitsInPreviousByte = NextFieldOffsetInBits - FieldOffset; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 169 | |
| 170 | bool FitsCompletelyInPreviousByte = |
| 171 | BitsInPreviousByte >= FieldValue.getBitWidth(); |
| 172 | |
| 173 | llvm::APInt Tmp = FieldValue; |
| 174 | |
| 175 | if (!FitsCompletelyInPreviousByte) { |
| 176 | unsigned NewFieldWidth = FieldSize - BitsInPreviousByte; |
| 177 | |
| 178 | if (CGM.getTargetData().isBigEndian()) { |
| 179 | Tmp = Tmp.lshr(NewFieldWidth); |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 180 | Tmp = Tmp.trunc(BitsInPreviousByte); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 181 | |
| 182 | // We want the remaining high bits. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 183 | FieldValue = FieldValue.trunc(NewFieldWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 184 | } else { |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 185 | Tmp = Tmp.trunc(BitsInPreviousByte); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 186 | |
| 187 | // We want the remaining low bits. |
| 188 | FieldValue = FieldValue.lshr(BitsInPreviousByte); |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 189 | FieldValue = FieldValue.trunc(NewFieldWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 190 | } |
| 191 | } |
| 192 | |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 193 | Tmp = Tmp.zext(CharWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 194 | if (CGM.getTargetData().isBigEndian()) { |
| 195 | if (FitsCompletelyInPreviousByte) |
| 196 | Tmp = Tmp.shl(BitsInPreviousByte - FieldValue.getBitWidth()); |
| 197 | } else { |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 198 | Tmp = Tmp.shl(CharWidth - BitsInPreviousByte); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 199 | } |
| 200 | |
Chris Lattner | 2bc0025 | 2010-07-05 18:03:30 +0000 | [diff] [blame] | 201 | // 'or' in the bits that go into the previous byte. |
| 202 | llvm::Value *LastElt = Elements.back(); |
| 203 | if (llvm::ConstantInt *Val = dyn_cast<llvm::ConstantInt>(LastElt)) |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 204 | Tmp |= Val->getValue(); |
Chris Lattner | 2bc0025 | 2010-07-05 18:03:30 +0000 | [diff] [blame] | 205 | else { |
| 206 | assert(isa<llvm::UndefValue>(LastElt)); |
| 207 | // If there is an undef field that we're adding to, it can either be a |
| 208 | // scalar undef (in which case, we just replace it with our field) or it |
| 209 | // is an array. If it is an array, we have to pull one byte off the |
| 210 | // array so that the other undef bytes stay around. |
| 211 | if (!isa<llvm::IntegerType>(LastElt->getType())) { |
| 212 | // The undef padding will be a multibyte array, create a new smaller |
| 213 | // padding and then an hole for our i8 to get plopped into. |
| 214 | assert(isa<llvm::ArrayType>(LastElt->getType()) && |
| 215 | "Expected array padding of undefs"); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 216 | llvm::ArrayType *AT = cast<llvm::ArrayType>(LastElt->getType()); |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 217 | assert(AT->getElementType()->isIntegerTy(CharWidth) && |
Chris Lattner | 2bc0025 | 2010-07-05 18:03:30 +0000 | [diff] [blame] | 218 | AT->getNumElements() != 0 && |
| 219 | "Expected non-empty array padding of undefs"); |
| 220 | |
| 221 | // Remove the padding array. |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 222 | NextFieldOffsetInChars -= CharUnits::fromQuantity(AT->getNumElements()); |
Chris Lattner | 2bc0025 | 2010-07-05 18:03:30 +0000 | [diff] [blame] | 223 | Elements.pop_back(); |
| 224 | |
| 225 | // Add the padding back in two chunks. |
Ken Dyck | c29ea8f | 2011-03-11 23:42:54 +0000 | [diff] [blame] | 226 | AppendPadding(CharUnits::fromQuantity(AT->getNumElements()-1)); |
| 227 | AppendPadding(CharUnits::One()); |
Chris Lattner | 2bc0025 | 2010-07-05 18:03:30 +0000 | [diff] [blame] | 228 | assert(isa<llvm::UndefValue>(Elements.back()) && |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 229 | Elements.back()->getType()->isIntegerTy(CharWidth) && |
Chris Lattner | 2bc0025 | 2010-07-05 18:03:30 +0000 | [diff] [blame] | 230 | "Padding addition didn't work right"); |
| 231 | } |
| 232 | } |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 233 | |
| 234 | Elements.back() = llvm::ConstantInt::get(CGM.getLLVMContext(), Tmp); |
| 235 | |
| 236 | if (FitsCompletelyInPreviousByte) |
Chris Lattner | 1880666 | 2010-07-05 17:04:23 +0000 | [diff] [blame] | 237 | return; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 238 | } |
| 239 | |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 240 | while (FieldValue.getBitWidth() > CharWidth) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 241 | llvm::APInt Tmp; |
| 242 | |
| 243 | if (CGM.getTargetData().isBigEndian()) { |
| 244 | // We want the high bits. |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 245 | Tmp = |
| 246 | FieldValue.lshr(FieldValue.getBitWidth() - CharWidth).trunc(CharWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 247 | } else { |
| 248 | // We want the low bits. |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 249 | Tmp = FieldValue.trunc(CharWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 250 | |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 251 | FieldValue = FieldValue.lshr(CharWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | Elements.push_back(llvm::ConstantInt::get(CGM.getLLVMContext(), Tmp)); |
Ken Dyck | 199c189 | 2011-03-19 01:28:06 +0000 | [diff] [blame] | 255 | ++NextFieldOffsetInChars; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 256 | |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 257 | FieldValue = FieldValue.trunc(FieldValue.getBitWidth() - CharWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | assert(FieldValue.getBitWidth() > 0 && |
| 261 | "Should have at least one bit left!"); |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 262 | assert(FieldValue.getBitWidth() <= CharWidth && |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 263 | "Should not have more than a byte left!"); |
| 264 | |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 265 | if (FieldValue.getBitWidth() < CharWidth) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 266 | if (CGM.getTargetData().isBigEndian()) { |
| 267 | unsigned BitWidth = FieldValue.getBitWidth(); |
| 268 | |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 269 | FieldValue = FieldValue.zext(CharWidth) << (CharWidth - BitWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 270 | } else |
Ken Dyck | 4f318c0 | 2011-03-19 00:57:28 +0000 | [diff] [blame] | 271 | FieldValue = FieldValue.zext(CharWidth); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | // Append the last element. |
| 275 | Elements.push_back(llvm::ConstantInt::get(CGM.getLLVMContext(), |
| 276 | FieldValue)); |
Ken Dyck | 199c189 | 2011-03-19 01:28:06 +0000 | [diff] [blame] | 277 | ++NextFieldOffsetInChars; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 278 | } |
| 279 | |
Ken Dyck | c29ea8f | 2011-03-11 23:42:54 +0000 | [diff] [blame] | 280 | void ConstStructBuilder::AppendPadding(CharUnits PadSize) { |
| 281 | if (PadSize.isZero()) |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 282 | return; |
| 283 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 284 | llvm::Type *Ty = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
Ken Dyck | c29ea8f | 2011-03-11 23:42:54 +0000 | [diff] [blame] | 285 | if (PadSize > CharUnits::One()) |
| 286 | Ty = llvm::ArrayType::get(Ty, PadSize.getQuantity()); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 287 | |
Nuno Lopes | cdb30b4 | 2010-04-16 20:56:35 +0000 | [diff] [blame] | 288 | llvm::Constant *C = llvm::UndefValue::get(Ty); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 289 | Elements.push_back(C); |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 290 | assert(getAlignment(C) == CharUnits::One() && |
| 291 | "Padding must have 1 byte alignment!"); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 292 | |
Ken Dyck | 15c152e | 2011-03-18 01:12:13 +0000 | [diff] [blame] | 293 | NextFieldOffsetInChars += getSizeInChars(C); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 294 | } |
| 295 | |
Ken Dyck | 106ca04 | 2011-03-11 02:17:05 +0000 | [diff] [blame] | 296 | void ConstStructBuilder::AppendTailPadding(CharUnits RecordSize) { |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 297 | assert(NextFieldOffsetInChars <= RecordSize && |
Ken Dyck | 106ca04 | 2011-03-11 02:17:05 +0000 | [diff] [blame] | 298 | "Size mismatch!"); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 299 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 300 | AppendPadding(RecordSize - NextFieldOffsetInChars); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 301 | } |
| 302 | |
| 303 | void ConstStructBuilder::ConvertStructToPacked() { |
| 304 | std::vector<llvm::Constant *> PackedElements; |
Ken Dyck | 4a5c87e | 2011-03-18 00:55:06 +0000 | [diff] [blame] | 305 | CharUnits ElementOffsetInChars = CharUnits::Zero(); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 306 | |
| 307 | for (unsigned i = 0, e = Elements.size(); i != e; ++i) { |
| 308 | llvm::Constant *C = Elements[i]; |
| 309 | |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 310 | CharUnits ElementAlign = CharUnits::fromQuantity( |
| 311 | CGM.getTargetData().getABITypeAlignment(C->getType())); |
Ken Dyck | 4a5c87e | 2011-03-18 00:55:06 +0000 | [diff] [blame] | 312 | CharUnits AlignedElementOffsetInChars = |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 313 | ElementOffsetInChars.RoundUpToAlignment(ElementAlign); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 314 | |
Ken Dyck | 4a5c87e | 2011-03-18 00:55:06 +0000 | [diff] [blame] | 315 | if (AlignedElementOffsetInChars > ElementOffsetInChars) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 316 | // We need some padding. |
Ken Dyck | 4a5c87e | 2011-03-18 00:55:06 +0000 | [diff] [blame] | 317 | CharUnits NumChars = |
| 318 | AlignedElementOffsetInChars - ElementOffsetInChars; |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 319 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 320 | llvm::Type *Ty = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
Ken Dyck | 4a5c87e | 2011-03-18 00:55:06 +0000 | [diff] [blame] | 321 | if (NumChars > CharUnits::One()) |
| 322 | Ty = llvm::ArrayType::get(Ty, NumChars.getQuantity()); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 323 | |
Nuno Lopes | cdb30b4 | 2010-04-16 20:56:35 +0000 | [diff] [blame] | 324 | llvm::Constant *Padding = llvm::UndefValue::get(Ty); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 325 | PackedElements.push_back(Padding); |
Ken Dyck | 15c152e | 2011-03-18 01:12:13 +0000 | [diff] [blame] | 326 | ElementOffsetInChars += getSizeInChars(Padding); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | PackedElements.push_back(C); |
Ken Dyck | 15c152e | 2011-03-18 01:12:13 +0000 | [diff] [blame] | 330 | ElementOffsetInChars += getSizeInChars(C); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 331 | } |
| 332 | |
Ken Dyck | 4a5c87e | 2011-03-18 00:55:06 +0000 | [diff] [blame] | 333 | assert(ElementOffsetInChars == NextFieldOffsetInChars && |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 334 | "Packing the struct changed its size!"); |
| 335 | |
| 336 | Elements = PackedElements; |
Ken Dyck | 7d2f9d5 | 2011-03-18 01:26:17 +0000 | [diff] [blame] | 337 | LLVMStructAlignment = CharUnits::One(); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 338 | Packed = true; |
| 339 | } |
| 340 | |
| 341 | bool ConstStructBuilder::Build(InitListExpr *ILE) { |
| 342 | RecordDecl *RD = ILE->getType()->getAs<RecordType>()->getDecl(); |
| 343 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 344 | |
| 345 | unsigned FieldNo = 0; |
| 346 | unsigned ElementNo = 0; |
Fariborz Jahanian | 07a8a21 | 2011-04-28 22:49:46 +0000 | [diff] [blame] | 347 | const FieldDecl *LastFD = 0; |
| 348 | bool IsMsStruct = RD->hasAttr<MsStructAttr>(); |
| 349 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 350 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 351 | FieldEnd = RD->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
Fariborz Jahanian | 07a8a21 | 2011-04-28 22:49:46 +0000 | [diff] [blame] | 352 | if (IsMsStruct) { |
| 353 | // Zero-length bitfields following non-bitfield members are |
| 354 | // ignored: |
Fariborz Jahanian | 855a8e7 | 2011-05-03 20:21:04 +0000 | [diff] [blame] | 355 | if (CGM.getContext().ZeroBitfieldFollowsNonBitfield((*Field), LastFD)) { |
Fariborz Jahanian | 07a8a21 | 2011-04-28 22:49:46 +0000 | [diff] [blame] | 356 | --FieldNo; |
| 357 | continue; |
| 358 | } |
| 359 | LastFD = (*Field); |
| 360 | } |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 361 | |
| 362 | // 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] | 363 | if (RD->isUnion() && ILE->getInitializedFieldInUnion() != *Field) |
| 364 | continue; |
| 365 | |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 366 | // Don't emit anonymous bitfields, they just affect layout. |
Eli Friedman | dbff1a0 | 2011-08-23 20:22:34 +0000 | [diff] [blame] | 367 | if (Field->isUnnamedBitfield()) { |
Fariborz Jahanian | 07a8a21 | 2011-04-28 22:49:46 +0000 | [diff] [blame] | 368 | LastFD = (*Field); |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 369 | continue; |
Fariborz Jahanian | 07a8a21 | 2011-04-28 22:49:46 +0000 | [diff] [blame] | 370 | } |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 371 | |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 372 | // Get the initializer. A struct can include fields without initializers, |
| 373 | // we just use explicit null values for them. |
| 374 | llvm::Constant *EltInit; |
| 375 | if (ElementNo < ILE->getNumInits()) |
| 376 | EltInit = CGM.EmitConstantExpr(ILE->getInit(ElementNo++), |
| 377 | Field->getType(), CGF); |
| 378 | else |
| 379 | EltInit = CGM.EmitNullConstant(Field->getType()); |
Eli Friedman | f0ca0ee | 2010-07-17 23:55:01 +0000 | [diff] [blame] | 380 | |
| 381 | if (!EltInit) |
| 382 | return false; |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 383 | |
| 384 | if (!Field->isBitField()) { |
| 385 | // Handle non-bitfield members. |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 386 | AppendField(*Field, Layout.getFieldOffset(FieldNo), EltInit); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 387 | } else { |
Chris Lattner | 8ce9e45 | 2010-04-13 18:16:19 +0000 | [diff] [blame] | 388 | // Otherwise we have a bitfield. |
Chris Lattner | 1880666 | 2010-07-05 17:04:23 +0000 | [diff] [blame] | 389 | AppendBitField(*Field, Layout.getFieldOffset(FieldNo), |
| 390 | cast<llvm::ConstantInt>(EltInit)); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 391 | } |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 392 | } |
| 393 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 394 | return true; |
| 395 | } |
| 396 | |
| 397 | void ConstStructBuilder::Build(const APValue &Val, QualType ValTy) { |
| 398 | RecordDecl *RD = ValTy->getAs<RecordType>()->getDecl(); |
| 399 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 400 | |
| 401 | if (CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { |
| 402 | unsigned BaseNo = 0; |
| 403 | for (CXXRecordDecl::base_class_iterator Base = CD->bases_begin(), |
| 404 | BaseEnd = CD->bases_end(); Base != BaseEnd; ++Base, ++BaseNo) { |
| 405 | // Build the base class subobject at the appropriately-offset location |
| 406 | // within this object. |
| 407 | const CXXRecordDecl *BD = Base->getType()->getAsCXXRecordDecl(); |
| 408 | CharUnits BaseOffset = Layout.getBaseClassOffset(BD); |
| 409 | NextFieldOffsetInChars -= BaseOffset; |
| 410 | |
| 411 | Build(Val.getStructBase(BaseNo), Base->getType()); |
| 412 | |
| 413 | NextFieldOffsetInChars += BaseOffset; |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | unsigned FieldNo = 0; |
| 418 | const FieldDecl *LastFD = 0; |
| 419 | bool IsMsStruct = RD->hasAttr<MsStructAttr>(); |
| 420 | |
| 421 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
| 422 | FieldEnd = RD->field_end(); Field != FieldEnd; ++Field, ++FieldNo) { |
| 423 | if (IsMsStruct) { |
| 424 | // Zero-length bitfields following non-bitfield members are |
| 425 | // ignored: |
| 426 | if (CGM.getContext().ZeroBitfieldFollowsNonBitfield((*Field), LastFD)) { |
| 427 | --FieldNo; |
| 428 | continue; |
| 429 | } |
| 430 | LastFD = (*Field); |
| 431 | } |
| 432 | |
| 433 | // If this is a union, skip all the fields that aren't being initialized. |
| 434 | if (RD->isUnion() && Val.getUnionField() != *Field) |
| 435 | continue; |
| 436 | |
| 437 | // Don't emit anonymous bitfields, they just affect layout. |
| 438 | if (Field->isUnnamedBitfield()) { |
| 439 | LastFD = (*Field); |
| 440 | continue; |
| 441 | } |
| 442 | |
| 443 | // Emit the value of the initializer. |
| 444 | const APValue &FieldValue = |
| 445 | RD->isUnion() ? Val.getUnionValue() : Val.getStructField(FieldNo); |
| 446 | llvm::Constant *EltInit = |
| 447 | CGM.EmitConstantValue(FieldValue, Field->getType(), CGF); |
| 448 | assert(EltInit && "EmitConstantValue can't fail"); |
| 449 | |
| 450 | if (!Field->isBitField()) { |
| 451 | // Handle non-bitfield members. |
| 452 | AppendField(*Field, Layout.getFieldOffset(FieldNo), EltInit); |
| 453 | } else { |
| 454 | // Otherwise we have a bitfield. |
| 455 | AppendBitField(*Field, Layout.getFieldOffset(FieldNo), |
| 456 | cast<llvm::ConstantInt>(EltInit)); |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | llvm::Constant *ConstStructBuilder::Finalize(QualType Ty) { |
| 462 | RecordDecl *RD = Ty->getAs<RecordType>()->getDecl(); |
| 463 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 464 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 465 | CharUnits LayoutSizeInChars = Layout.getSize(); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 466 | |
Ken Dyck | dc49639 | 2011-03-17 01:33:18 +0000 | [diff] [blame] | 467 | if (NextFieldOffsetInChars > LayoutSizeInChars) { |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 468 | // If the struct is bigger than the size of the record type, |
| 469 | // we must have a flexible array member at the end. |
| 470 | assert(RD->hasFlexibleArrayMember() && |
| 471 | "Must have flexible array member if struct is bigger than type!"); |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 472 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 473 | // No tail padding is necessary. |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 474 | } else { |
| 475 | // Append tail padding if necessary. |
| 476 | AppendTailPadding(LayoutSizeInChars); |
| 477 | |
| 478 | CharUnits LLVMSizeInChars = |
| 479 | NextFieldOffsetInChars.RoundUpToAlignment(LLVMStructAlignment); |
| 480 | |
| 481 | // Check if we need to convert the struct to a packed struct. |
| 482 | if (NextFieldOffsetInChars <= LayoutSizeInChars && |
| 483 | LLVMSizeInChars > LayoutSizeInChars) { |
| 484 | assert(!Packed && "Size mismatch!"); |
| 485 | |
| 486 | ConvertStructToPacked(); |
| 487 | assert(NextFieldOffsetInChars <= LayoutSizeInChars && |
| 488 | "Converting to packed did not help!"); |
| 489 | } |
| 490 | |
| 491 | assert(LayoutSizeInChars == NextFieldOffsetInChars && |
| 492 | "Tail padding mismatch!"); |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 493 | } |
| 494 | |
Chris Lattner | c5cbb90 | 2011-06-20 04:01:35 +0000 | [diff] [blame] | 495 | // Pick the type to use. If the type is layout identical to the ConvertType |
| 496 | // type then use it, otherwise use whatever the builder produced for us. |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 497 | llvm::StructType *STy = |
Chris Lattner | c5cbb90 | 2011-06-20 04:01:35 +0000 | [diff] [blame] | 498 | llvm::ConstantStruct::getTypeForElements(CGM.getLLVMContext(), |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 499 | Elements, Packed); |
| 500 | llvm::Type *ValTy = CGM.getTypes().ConvertType(Ty); |
| 501 | if (llvm::StructType *ValSTy = dyn_cast<llvm::StructType>(ValTy)) { |
| 502 | if (ValSTy->isLayoutIdentical(STy)) |
| 503 | STy = ValSTy; |
Chris Lattner | c5cbb90 | 2011-06-20 04:01:35 +0000 | [diff] [blame] | 504 | } |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 505 | |
| 506 | llvm::Constant *Result = llvm::ConstantStruct::get(STy, Elements); |
| 507 | |
| 508 | assert(NextFieldOffsetInChars.RoundUpToAlignment(getAlignment(Result)) == |
| 509 | getSizeInChars(Result) && "Size mismatch!"); |
| 510 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 511 | return Result; |
| 512 | } |
| 513 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 514 | llvm::Constant *ConstStructBuilder::BuildStruct(CodeGenModule &CGM, |
| 515 | CodeGenFunction *CGF, |
| 516 | InitListExpr *ILE) { |
| 517 | ConstStructBuilder Builder(CGM, CGF); |
| 518 | |
| 519 | if (!Builder.Build(ILE)) |
| 520 | return 0; |
| 521 | |
| 522 | return Builder.Finalize(ILE->getType()); |
| 523 | } |
| 524 | |
| 525 | llvm::Constant *ConstStructBuilder::BuildStruct(CodeGenModule &CGM, |
| 526 | CodeGenFunction *CGF, |
| 527 | const APValue &Val, |
| 528 | QualType ValTy) { |
| 529 | ConstStructBuilder Builder(CGM, CGF); |
| 530 | Builder.Build(Val, ValTy); |
| 531 | return Builder.Finalize(ValTy); |
| 532 | } |
| 533 | |
| 534 | |
Chris Lattner | eba3e5a | 2010-04-13 17:45:57 +0000 | [diff] [blame] | 535 | //===----------------------------------------------------------------------===// |
| 536 | // ConstExprEmitter |
| 537 | //===----------------------------------------------------------------------===// |
Richard Smith | e7aa62d | 2012-01-17 21:42:19 +0000 | [diff] [blame^] | 538 | |
| 539 | /// This class only needs to handle two cases: |
| 540 | /// 1) Literals (this is used by APValue emission to emit literals). |
| 541 | /// 2) Arrays, structs and unions (outside C++11 mode, we don't currently |
| 542 | /// constant fold these types). |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 543 | class ConstExprEmitter : |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 544 | public StmtVisitor<ConstExprEmitter, llvm::Constant*> { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 545 | CodeGenModule &CGM; |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 546 | CodeGenFunction *CGF; |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 547 | llvm::LLVMContext &VMContext; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 548 | public: |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 549 | ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 550 | : CGM(cgm), CGF(cgf), VMContext(cgm.getLLVMContext()) { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 551 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 552 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 553 | //===--------------------------------------------------------------------===// |
| 554 | // Visitor Methods |
| 555 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 556 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 557 | llvm::Constant *VisitStmt(Stmt *S) { |
Anders Carlsson | 069880e | 2009-03-03 16:43:34 +0000 | [diff] [blame] | 558 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 559 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 560 | |
| 561 | llvm::Constant *VisitParenExpr(ParenExpr *PE) { |
| 562 | return Visit(PE->getSubExpr()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 563 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 564 | |
John McCall | 91a5755 | 2011-07-15 05:09:51 +0000 | [diff] [blame] | 565 | llvm::Constant * |
| 566 | VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *PE) { |
| 567 | return Visit(PE->getReplacement()); |
| 568 | } |
| 569 | |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 570 | llvm::Constant *VisitGenericSelectionExpr(GenericSelectionExpr *GE) { |
| 571 | return Visit(GE->getResultExpr()); |
| 572 | } |
| 573 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 574 | llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
| 575 | return Visit(E->getInitializer()); |
| 576 | } |
John McCall | 5808ce4 | 2011-02-03 08:15:49 +0000 | [diff] [blame] | 577 | |
Argyrios Kyrtzidis | 0835a3c | 2008-08-18 23:01:59 +0000 | [diff] [blame] | 578 | llvm::Constant *VisitCastExpr(CastExpr* E) { |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 579 | Expr *subExpr = E->getSubExpr(); |
| 580 | llvm::Constant *C = CGM.EmitConstantExpr(subExpr, subExpr->getType(), CGF); |
| 581 | if (!C) return 0; |
| 582 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 583 | llvm::Type *destType = ConvertType(E->getType()); |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 584 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 585 | switch (E->getCastKind()) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 586 | case CK_ToUnion: { |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 587 | // GCC cast to union extension |
| 588 | assert(E->getType()->isUnionType() && |
| 589 | "Destination type is not union type!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 590 | |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 591 | // Build a struct with the union sub-element as the first member, |
| 592 | // and padded to the appropriate size |
| 593 | std::vector<llvm::Constant*> Elts; |
Jay Foad | ef6de3d | 2011-07-11 09:56:20 +0000 | [diff] [blame] | 594 | std::vector<llvm::Type*> Types; |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 595 | Elts.push_back(C); |
| 596 | Types.push_back(C->getType()); |
| 597 | unsigned CurSize = CGM.getTargetData().getTypeAllocSize(C->getType()); |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 598 | unsigned TotalSize = CGM.getTargetData().getTypeAllocSize(destType); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 599 | |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 600 | assert(CurSize <= TotalSize && "Union size mismatch!"); |
| 601 | if (unsigned NumPadBytes = TotalSize - CurSize) { |
Jay Foad | ef6de3d | 2011-07-11 09:56:20 +0000 | [diff] [blame] | 602 | llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 603 | if (NumPadBytes > 1) |
| 604 | Ty = llvm::ArrayType::get(Ty, NumPadBytes); |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 605 | |
Nuno Lopes | cdb30b4 | 2010-04-16 20:56:35 +0000 | [diff] [blame] | 606 | Elts.push_back(llvm::UndefValue::get(Ty)); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 607 | Types.push_back(Ty); |
| 608 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 609 | |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 610 | llvm::StructType* STy = |
| 611 | llvm::StructType::get(C->getType()->getContext(), Types, false); |
Anders Carlsson | aaed50d | 2009-07-31 21:38:39 +0000 | [diff] [blame] | 612 | return llvm::ConstantStruct::get(STy, Elts); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 613 | } |
Anders Carlsson | bb378cb | 2009-10-18 20:31:03 +0000 | [diff] [blame] | 614 | |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 615 | case CK_LValueToRValue: |
David Chisnall | 7a7ee30 | 2012-01-16 17:27:18 +0000 | [diff] [blame] | 616 | case CK_AtomicToNonAtomic: |
| 617 | case CK_NonAtomicToAtomic: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 618 | case CK_NoOp: |
| 619 | return C; |
Anders Carlsson | bb378cb | 2009-10-18 20:31:03 +0000 | [diff] [blame] | 620 | |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 621 | case CK_Dependent: llvm_unreachable("saw dependent cast!"); |
| 622 | |
| 623 | // These will never be supported. |
| 624 | case CK_ObjCObjectLValueCast: |
John McCall | 33e56f3 | 2011-09-10 06:18:15 +0000 | [diff] [blame] | 625 | case CK_ARCProduceObject: |
| 626 | case CK_ARCConsumeObject: |
| 627 | case CK_ARCReclaimReturnedObject: |
| 628 | case CK_ARCExtendBlockObject: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 629 | return 0; |
| 630 | |
Eli Friedman | 6563928 | 2012-01-04 23:13:47 +0000 | [diff] [blame] | 631 | // These don't need to be handled here because Evaluate knows how to |
Richard Smith | e7aa62d | 2012-01-17 21:42:19 +0000 | [diff] [blame^] | 632 | // evaluate them in the cases where they can be folded. |
| 633 | case CK_ToVoid: |
| 634 | case CK_Dynamic: |
| 635 | case CK_LValueBitCast: |
| 636 | case CK_NullToMemberPointer: |
| 637 | case CK_DerivedToBaseMemberPointer: |
| 638 | case CK_BaseToDerivedMemberPointer: |
| 639 | case CK_UserDefinedConversion: |
| 640 | case CK_ConstructorConversion: |
Eli Friedman | 6563928 | 2012-01-04 23:13:47 +0000 | [diff] [blame] | 641 | case CK_CPointerToObjCPointerCast: |
| 642 | case CK_BlockPointerToObjCPointerCast: |
| 643 | case CK_AnyPointerToBlockPointerCast: |
| 644 | case CK_BitCast: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 645 | case CK_ArrayToPointerDecay: |
| 646 | case CK_FunctionToPointerDecay: |
| 647 | case CK_BaseToDerived: |
| 648 | case CK_DerivedToBase: |
| 649 | case CK_UncheckedDerivedToBase: |
| 650 | case CK_MemberPointerToBoolean: |
| 651 | case CK_VectorSplat: |
| 652 | case CK_FloatingRealToComplex: |
| 653 | case CK_FloatingComplexToReal: |
| 654 | case CK_FloatingComplexToBoolean: |
| 655 | case CK_FloatingComplexCast: |
| 656 | case CK_FloatingComplexToIntegralComplex: |
| 657 | case CK_IntegralRealToComplex: |
| 658 | case CK_IntegralComplexToReal: |
| 659 | case CK_IntegralComplexToBoolean: |
| 660 | case CK_IntegralComplexCast: |
| 661 | case CK_IntegralComplexToFloatingComplex: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 662 | case CK_PointerToIntegral: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 663 | case CK_PointerToBoolean: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 664 | case CK_NullToPointer: |
Eli Friedman | 6563928 | 2012-01-04 23:13:47 +0000 | [diff] [blame] | 665 | case CK_IntegralCast: |
| 666 | case CK_IntegralToPointer: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 667 | case CK_IntegralToBoolean: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 668 | case CK_IntegralToFloating: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 669 | case CK_FloatingToIntegral: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 670 | case CK_FloatingToBoolean: |
John McCall | 8bba1f4 | 2011-03-15 21:17:48 +0000 | [diff] [blame] | 671 | case CK_FloatingCast: |
Eli Friedman | 6563928 | 2012-01-04 23:13:47 +0000 | [diff] [blame] | 672 | return 0; |
Anders Carlsson | 0086ccb | 2009-08-22 23:54:44 +0000 | [diff] [blame] | 673 | } |
Matt Beaumont-Gay | 17d12fe | 2011-03-17 00:46:34 +0000 | [diff] [blame] | 674 | llvm_unreachable("Invalid CastKind"); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 675 | } |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 676 | |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 677 | llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 678 | return Visit(DAE->getExpr()); |
| 679 | } |
| 680 | |
Douglas Gregor | 03e8003 | 2011-06-21 17:03:29 +0000 | [diff] [blame] | 681 | llvm::Constant *VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E) { |
| 682 | return Visit(E->GetTemporaryExpr()); |
| 683 | } |
| 684 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 685 | llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) { |
Nuno Lopes | a75b71f | 2010-04-18 19:06:43 +0000 | [diff] [blame] | 686 | unsigned NumInitElements = ILE->getNumInits(); |
Benjamin Kramer | 0483a6f | 2011-03-02 21:27:44 +0000 | [diff] [blame] | 687 | if (NumInitElements == 1 && ILE->getType() == ILE->getInit(0)->getType() && |
Nuno Lopes | a75b71f | 2010-04-18 19:06:43 +0000 | [diff] [blame] | 688 | (isa<StringLiteral>(ILE->getInit(0)) || |
| 689 | isa<ObjCEncodeExpr>(ILE->getInit(0)))) |
| 690 | return Visit(ILE->getInit(0)); |
| 691 | |
Nuno Lopes | 6784704 | 2010-04-16 23:19:41 +0000 | [diff] [blame] | 692 | std::vector<llvm::Constant*> Elts; |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 693 | llvm::ArrayType *AType = |
Nuno Lopes | 6784704 | 2010-04-16 23:19:41 +0000 | [diff] [blame] | 694 | cast<llvm::ArrayType>(ConvertType(ILE->getType())); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 695 | llvm::Type *ElemTy = AType->getElementType(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 696 | unsigned NumElements = AType->getNumElements(); |
| 697 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 698 | // Initialising an array requires us to automatically |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 699 | // initialise any elements that have not been initialised explicitly |
| 700 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 701 | |
| 702 | // Copy initializer elements. |
| 703 | unsigned i = 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 704 | bool RewriteType = false; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 705 | for (; i < NumInitableElts; ++i) { |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 706 | Expr *Init = ILE->getInit(i); |
| 707 | llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 708 | if (!C) |
| 709 | return 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 710 | RewriteType |= (C->getType() != ElemTy); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 711 | Elts.push_back(C); |
| 712 | } |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 713 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 714 | // Initialize remaining array elements. |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 715 | // FIXME: This doesn't handle member pointers correctly! |
Argyrios Kyrtzidis | 4423ac0 | 2011-04-21 00:27:41 +0000 | [diff] [blame] | 716 | llvm::Constant *fillC; |
| 717 | if (Expr *filler = ILE->getArrayFiller()) |
| 718 | fillC = CGM.EmitConstantExpr(filler, filler->getType(), CGF); |
| 719 | else |
| 720 | fillC = llvm::Constant::getNullValue(ElemTy); |
| 721 | if (!fillC) |
| 722 | return 0; |
| 723 | RewriteType |= (fillC->getType() != ElemTy); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 724 | for (; i < NumElements; ++i) |
Argyrios Kyrtzidis | 4423ac0 | 2011-04-21 00:27:41 +0000 | [diff] [blame] | 725 | Elts.push_back(fillC); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 726 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 727 | if (RewriteType) { |
| 728 | // FIXME: Try to avoid packing the array |
Jay Foad | ef6de3d | 2011-07-11 09:56:20 +0000 | [diff] [blame] | 729 | std::vector<llvm::Type*> Types; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 730 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 731 | Types.push_back(Elts[i]->getType()); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 732 | llvm::StructType *SType = llvm::StructType::get(AType->getContext(), |
Owen Anderson | 47a434f | 2009-08-05 23:18:46 +0000 | [diff] [blame] | 733 | Types, true); |
Owen Anderson | 08e2524 | 2009-07-27 22:29:56 +0000 | [diff] [blame] | 734 | return llvm::ConstantStruct::get(SType, Elts); |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 735 | } |
| 736 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 737 | return llvm::ConstantArray::get(AType, Elts); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 738 | } |
| 739 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 740 | llvm::Constant *EmitStructInitialization(InitListExpr *ILE) { |
Anders Carlsson | 8dca3b3 | 2009-07-27 05:54:15 +0000 | [diff] [blame] | 741 | return ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 742 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 743 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 744 | llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) { |
Anders Carlsson | f6c4396 | 2009-07-31 21:34:04 +0000 | [diff] [blame] | 745 | return ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 746 | } |
| 747 | |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 748 | llvm::Constant *VisitImplicitValueInitExpr(ImplicitValueInitExpr* E) { |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 749 | return CGM.EmitNullConstant(E->getType()); |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 750 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 751 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 752 | llvm::Constant *VisitInitListExpr(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 753 | if (ILE->getType()->isArrayType()) |
| 754 | return EmitArrayInitialization(ILE); |
Devang Patel | 47fb697 | 2008-01-29 23:23:18 +0000 | [diff] [blame] | 755 | |
Anders Carlsson | 01a79ac | 2009-11-21 23:56:04 +0000 | [diff] [blame] | 756 | if (ILE->getType()->isRecordType()) |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 757 | return EmitStructInitialization(ILE); |
| 758 | |
| 759 | if (ILE->getType()->isUnionType()) |
| 760 | return EmitUnionInitialization(ILE); |
| 761 | |
Eli Friedman | 7ead5c7 | 2012-01-10 04:58:17 +0000 | [diff] [blame] | 762 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 763 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 764 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 765 | llvm::Constant *VisitCXXConstructExpr(CXXConstructExpr *E) { |
| 766 | if (!E->getConstructor()->isTrivial()) |
| 767 | return 0; |
| 768 | |
Anders Carlsson | 2ca4f63 | 2010-02-05 18:38:45 +0000 | [diff] [blame] | 769 | QualType Ty = E->getType(); |
| 770 | |
| 771 | // FIXME: We should not have to call getBaseElementType here. |
| 772 | const RecordType *RT = |
| 773 | CGM.getContext().getBaseElementType(Ty)->getAs<RecordType>(); |
| 774 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 775 | |
| 776 | // If the class doesn't have a trivial destructor, we can't emit it as a |
| 777 | // constant expr. |
| 778 | if (!RD->hasTrivialDestructor()) |
| 779 | return 0; |
| 780 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 781 | // Only copy and default constructors can be trivial. |
| 782 | |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 783 | |
| 784 | if (E->getNumArgs()) { |
| 785 | assert(E->getNumArgs() == 1 && "trivial ctor with > 1 argument"); |
Sebastian Redl | 85ea7aa | 2011-08-30 19:58:05 +0000 | [diff] [blame] | 786 | assert(E->getConstructor()->isCopyOrMoveConstructor() && |
| 787 | "trivial ctor has argument but isn't a copy/move ctor"); |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 788 | |
| 789 | Expr *Arg = E->getArg(0); |
| 790 | assert(CGM.getContext().hasSameUnqualifiedType(Ty, Arg->getType()) && |
| 791 | "argument to copy ctor is of wrong type"); |
| 792 | |
Chandler Carruth | 878b55c | 2010-02-02 12:15:55 +0000 | [diff] [blame] | 793 | return Visit(Arg); |
John McCall | fb8b69a | 2010-02-02 08:02:49 +0000 | [diff] [blame] | 794 | } |
| 795 | |
| 796 | return CGM.EmitNullConstant(Ty); |
| 797 | } |
| 798 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 799 | llvm::Constant *VisitStringLiteral(StringLiteral *E) { |
Eli Friedman | 64f45a2 | 2011-11-01 02:23:42 +0000 | [diff] [blame] | 800 | return CGM.GetConstantArrayFromStringLiteral(E); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 801 | } |
| 802 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 803 | llvm::Constant *VisitObjCEncodeExpr(ObjCEncodeExpr *E) { |
| 804 | // This must be an @encode initializing an array in a static initializer. |
| 805 | // Don't emit it as the address of the string, emit the string data itself |
| 806 | // as an inline array. |
| 807 | std::string Str; |
| 808 | CGM.getContext().getObjCEncodingForType(E->getEncodedType(), Str); |
| 809 | const ConstantArrayType *CAT = cast<ConstantArrayType>(E->getType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 810 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 811 | // Resize the string to the right size, adding zeros at the end, or |
| 812 | // truncating as needed. |
| 813 | Str.resize(CAT->getSize().getZExtValue(), '\0'); |
Owen Anderson | 0032b27 | 2009-08-13 21:57:51 +0000 | [diff] [blame] | 814 | return llvm::ConstantArray::get(VMContext, Str, false); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 815 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 816 | |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 817 | llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) { |
| 818 | return Visit(E->getSubExpr()); |
| 819 | } |
Mike Stump | b83d287 | 2009-02-19 22:01:56 +0000 | [diff] [blame] | 820 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 821 | // Utility methods |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 822 | llvm::Type *ConvertType(QualType T) { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 823 | return CGM.getTypes().ConvertType(T); |
| 824 | } |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 825 | |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 826 | public: |
Richard Smith | 1bf9a9e | 2011-11-12 22:28:03 +0000 | [diff] [blame] | 827 | llvm::Constant *EmitLValue(APValue::LValueBase LVBase) { |
| 828 | if (const ValueDecl *Decl = LVBase.dyn_cast<const ValueDecl*>()) { |
Rafael Espindola | da18261 | 2010-03-04 21:26:03 +0000 | [diff] [blame] | 829 | if (Decl->hasAttr<WeakRefAttr>()) |
Eli Friedman | a7e6845 | 2010-08-22 01:00:03 +0000 | [diff] [blame] | 830 | return CGM.GetWeakRefReference(Decl); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 831 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl)) |
Anders Carlsson | 555b4bb | 2009-09-10 23:43:36 +0000 | [diff] [blame] | 832 | return CGM.GetAddrOfFunction(FD); |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 833 | if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 834 | // We can never refer to a variable with local storage. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 835 | if (!VD->hasLocalStorage()) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 836 | if (VD->isFileVarDecl() || VD->hasExternalStorage()) |
| 837 | return CGM.GetAddrOfGlobalVar(VD); |
John McCall | b6bbcc9 | 2010-10-15 04:57:14 +0000 | [diff] [blame] | 838 | else if (VD->isLocalVarDecl()) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 839 | assert(CGF && "Can't access static local vars without CGF"); |
| 840 | return CGF->GetAddrOfStaticLocalVar(VD); |
| 841 | } |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 842 | } |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 843 | } |
Richard Smith | 1bf9a9e | 2011-11-12 22:28:03 +0000 | [diff] [blame] | 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | Expr *E = const_cast<Expr*>(LVBase.get<const Expr*>()); |
| 848 | switch (E->getStmtClass()) { |
| 849 | default: break; |
| 850 | case Expr::CompoundLiteralExprClass: { |
| 851 | // Note that due to the nature of compound literals, this is guaranteed |
| 852 | // to be the only use of the variable, so we just generate it here. |
| 853 | CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); |
Eli Friedman | 58c65fc | 2011-12-22 00:04:00 +0000 | [diff] [blame] | 854 | llvm::Constant* C = CGM.EmitConstantExpr(CLE->getInitializer(), |
| 855 | CLE->getType(), CGF); |
Richard Smith | 1bf9a9e | 2011-11-12 22:28:03 +0000 | [diff] [blame] | 856 | // FIXME: "Leaked" on failure. |
| 857 | if (C) |
| 858 | C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), |
| 859 | E->getType().isConstant(CGM.getContext()), |
| 860 | llvm::GlobalValue::InternalLinkage, |
| 861 | C, ".compoundliteral", 0, false, |
| 862 | CGM.getContext().getTargetAddressSpace(E->getType())); |
| 863 | return C; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 864 | } |
Daniel Dunbar | 6143293 | 2008-08-13 23:20:05 +0000 | [diff] [blame] | 865 | case Expr::StringLiteralClass: |
| 866 | return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E)); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 867 | case Expr::ObjCEncodeExprClass: |
| 868 | return CGM.GetAddrOfConstantStringFromObjCEncode(cast<ObjCEncodeExpr>(E)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 869 | case Expr::ObjCStringLiteralClass: { |
| 870 | ObjCStringLiteral* SL = cast<ObjCStringLiteral>(E); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 871 | llvm::Constant *C = |
| 872 | CGM.getObjCRuntime().GenerateConstantString(SL->getString()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 873 | return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType())); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 874 | } |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 875 | case Expr::PredefinedExprClass: { |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 876 | unsigned Type = cast<PredefinedExpr>(E)->getIdentType(); |
| 877 | if (CGF) { |
Daniel Dunbar | 3ec0baf | 2010-08-21 03:01:12 +0000 | [diff] [blame] | 878 | LValue Res = CGF->EmitPredefinedLValue(cast<PredefinedExpr>(E)); |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 879 | return cast<llvm::Constant>(Res.getAddress()); |
| 880 | } else if (Type == PredefinedExpr::PrettyFunction) { |
| 881 | return CGM.GetAddrOfConstantCString("top level", ".tmp"); |
| 882 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 883 | |
Eli Friedman | f70b24e | 2009-11-14 08:37:13 +0000 | [diff] [blame] | 884 | return CGM.GetAddrOfConstantCString("", ".tmp"); |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 885 | } |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 886 | case Expr::AddrLabelExprClass: { |
| 887 | assert(CGF && "Invalid address of label expression outside function."); |
Chris Lattner | d9becd1 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 888 | llvm::Constant *Ptr = |
| 889 | CGF->GetAddrOfLabel(cast<AddrLabelExpr>(E)->getLabel()); |
| 890 | return llvm::ConstantExpr::getBitCast(Ptr, ConvertType(E->getType())); |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 891 | } |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 892 | case Expr::CallExprClass: { |
| 893 | CallExpr* CE = cast<CallExpr>(E); |
Richard Smith | 180f479 | 2011-11-10 06:34:14 +0000 | [diff] [blame] | 894 | unsigned builtin = CE->isBuiltinCall(); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 895 | if (builtin != |
| 896 | Builtin::BI__builtin___CFStringMakeConstantString && |
| 897 | builtin != |
| 898 | Builtin::BI__builtin___NSStringMakeConstantString) |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 899 | break; |
| 900 | const Expr *Arg = CE->getArg(0)->IgnoreParenCasts(); |
| 901 | const StringLiteral *Literal = cast<StringLiteral>(Arg); |
David Chisnall | 0d13f6f | 2010-01-23 02:40:42 +0000 | [diff] [blame] | 902 | if (builtin == |
| 903 | Builtin::BI__builtin___NSStringMakeConstantString) { |
| 904 | return CGM.getObjCRuntime().GenerateConstantString(Literal); |
| 905 | } |
Steve Naroff | 33fdb73 | 2009-03-31 16:53:37 +0000 | [diff] [blame] | 906 | // FIXME: need to deal with UCN conversion issues. |
Steve Naroff | 8d4141f | 2009-04-01 13:55:36 +0000 | [diff] [blame] | 907 | return CGM.GetAddrOfConstantCFString(Literal); |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 908 | } |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 909 | case Expr::BlockExprClass: { |
Anders Carlsson | 4de9fce | 2009-03-01 01:09:12 +0000 | [diff] [blame] | 910 | std::string FunctionName; |
| 911 | if (CGF) |
| 912 | FunctionName = CGF->CurFn->getName(); |
| 913 | else |
| 914 | FunctionName = "global"; |
| 915 | |
| 916 | return CGM.GetAddrOfGlobalBlock(cast<BlockExpr>(E), FunctionName.c_str()); |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 917 | } |
Richard Smith | 47d2145 | 2011-12-27 12:18:28 +0000 | [diff] [blame] | 918 | case Expr::CXXTypeidExprClass: { |
| 919 | CXXTypeidExpr *Typeid = cast<CXXTypeidExpr>(E); |
| 920 | QualType T; |
| 921 | if (Typeid->isTypeOperand()) |
| 922 | T = Typeid->getTypeOperand(); |
| 923 | else |
| 924 | T = Typeid->getExprOperand()->getType(); |
| 925 | return CGM.GetAddrOfRTTIDescriptor(T); |
| 926 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 927 | } |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 928 | |
| 929 | return 0; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 930 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 931 | }; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 932 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 933 | } // end anonymous namespace. |
| 934 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 935 | llvm::Constant *CodeGenModule::EmitConstantInit(const VarDecl &D, |
| 936 | CodeGenFunction *CGF) { |
| 937 | if (const APValue *Value = D.evaluateValue()) |
| 938 | return EmitConstantValue(*Value, D.getType(), CGF); |
| 939 | |
| 940 | const Expr *E = D.getInit(); |
| 941 | assert(E && "No initializer to emit"); |
| 942 | |
| 943 | llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E)); |
| 944 | if (C && C->getType()->isIntegerTy(1)) { |
| 945 | llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
| 946 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
| 947 | } |
| 948 | return C; |
| 949 | } |
| 950 | |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 951 | llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E, |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 952 | QualType DestType, |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 953 | CodeGenFunction *CGF) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 954 | Expr::EvalResult Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 955 | |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 956 | bool Success = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 957 | |
Eli Friedman | 50c39ea | 2009-05-27 06:04:58 +0000 | [diff] [blame] | 958 | if (DestType->isReferenceType()) |
| 959 | Success = E->EvaluateAsLValue(Result, Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 960 | else |
Richard Smith | 51f4708 | 2011-10-29 00:50:52 +0000 | [diff] [blame] | 961 | Success = E->EvaluateAsRValue(Result, Context); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 962 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 963 | if (Success && !Result.HasSideEffects) |
| 964 | return EmitConstantValue(Result.Val, DestType, CGF); |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 965 | |
| 966 | llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E)); |
Chris Lattner | 7f215c1 | 2010-06-26 21:52:32 +0000 | [diff] [blame] | 967 | if (C && C->getType()->isIntegerTy(1)) { |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 968 | llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | 3c4972d | 2009-07-29 18:54:39 +0000 | [diff] [blame] | 969 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 970 | } |
| 971 | return C; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 972 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 973 | |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 974 | llvm::Constant *CodeGenModule::EmitConstantValue(const APValue &Value, |
| 975 | QualType DestType, |
| 976 | CodeGenFunction *CGF) { |
| 977 | switch (Value.getKind()) { |
| 978 | case APValue::Uninitialized: |
| 979 | llvm_unreachable("Constant expressions should be initialized."); |
| 980 | case APValue::LValue: { |
| 981 | llvm::Type *DestTy = getTypes().ConvertTypeForMem(DestType); |
| 982 | llvm::Constant *Offset = |
| 983 | llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), |
| 984 | Value.getLValueOffset().getQuantity()); |
| 985 | |
| 986 | llvm::Constant *C; |
| 987 | if (APValue::LValueBase LVBase = Value.getLValueBase()) { |
| 988 | // An array can be represented as an lvalue referring to the base. |
| 989 | if (isa<llvm::ArrayType>(DestTy)) { |
| 990 | assert(Offset->isNullValue() && "offset on array initializer"); |
| 991 | return ConstExprEmitter(*this, CGF).Visit( |
| 992 | const_cast<Expr*>(LVBase.get<const Expr*>())); |
| 993 | } |
| 994 | |
| 995 | C = ConstExprEmitter(*this, CGF).EmitLValue(LVBase); |
| 996 | |
| 997 | // Apply offset if necessary. |
| 998 | if (!Offset->isNullValue()) { |
| 999 | llvm::Type *Type = llvm::Type::getInt8PtrTy(VMContext); |
| 1000 | llvm::Constant *Casted = llvm::ConstantExpr::getBitCast(C, Type); |
| 1001 | Casted = llvm::ConstantExpr::getGetElementPtr(Casted, Offset); |
| 1002 | C = llvm::ConstantExpr::getBitCast(Casted, C->getType()); |
| 1003 | } |
| 1004 | |
| 1005 | // Convert to the appropriate type; this could be an lvalue for |
| 1006 | // an integer. |
| 1007 | if (isa<llvm::PointerType>(DestTy)) |
| 1008 | return llvm::ConstantExpr::getBitCast(C, DestTy); |
| 1009 | |
| 1010 | return llvm::ConstantExpr::getPtrToInt(C, DestTy); |
| 1011 | } else { |
| 1012 | C = Offset; |
| 1013 | |
| 1014 | // Convert to the appropriate type; this could be an lvalue for |
| 1015 | // an integer. |
| 1016 | if (isa<llvm::PointerType>(DestTy)) |
| 1017 | return llvm::ConstantExpr::getIntToPtr(C, DestTy); |
| 1018 | |
| 1019 | // If the types don't match this should only be a truncate. |
| 1020 | if (C->getType() != DestTy) |
| 1021 | return llvm::ConstantExpr::getTrunc(C, DestTy); |
| 1022 | |
| 1023 | return C; |
| 1024 | } |
| 1025 | } |
| 1026 | case APValue::Int: { |
| 1027 | llvm::Constant *C = llvm::ConstantInt::get(VMContext, |
| 1028 | Value.getInt()); |
| 1029 | |
| 1030 | if (C->getType()->isIntegerTy(1)) { |
| 1031 | llvm::Type *BoolTy = getTypes().ConvertTypeForMem(DestType); |
| 1032 | C = llvm::ConstantExpr::getZExt(C, BoolTy); |
| 1033 | } |
| 1034 | return C; |
| 1035 | } |
| 1036 | case APValue::ComplexInt: { |
| 1037 | llvm::Constant *Complex[2]; |
| 1038 | |
| 1039 | Complex[0] = llvm::ConstantInt::get(VMContext, |
| 1040 | Value.getComplexIntReal()); |
| 1041 | Complex[1] = llvm::ConstantInt::get(VMContext, |
| 1042 | Value.getComplexIntImag()); |
| 1043 | |
| 1044 | // FIXME: the target may want to specify that this is packed. |
| 1045 | llvm::StructType *STy = llvm::StructType::get(Complex[0]->getType(), |
| 1046 | Complex[1]->getType(), |
| 1047 | NULL); |
| 1048 | return llvm::ConstantStruct::get(STy, Complex); |
| 1049 | } |
| 1050 | case APValue::Float: { |
| 1051 | const llvm::APFloat &Init = Value.getFloat(); |
| 1052 | if (&Init.getSemantics() == &llvm::APFloat::IEEEhalf) |
| 1053 | return llvm::ConstantInt::get(VMContext, Init.bitcastToAPInt()); |
| 1054 | else |
| 1055 | return llvm::ConstantFP::get(VMContext, Init); |
| 1056 | } |
| 1057 | case APValue::ComplexFloat: { |
| 1058 | llvm::Constant *Complex[2]; |
| 1059 | |
| 1060 | Complex[0] = llvm::ConstantFP::get(VMContext, |
| 1061 | Value.getComplexFloatReal()); |
| 1062 | Complex[1] = llvm::ConstantFP::get(VMContext, |
| 1063 | Value.getComplexFloatImag()); |
| 1064 | |
| 1065 | // FIXME: the target may want to specify that this is packed. |
| 1066 | llvm::StructType *STy = llvm::StructType::get(Complex[0]->getType(), |
| 1067 | Complex[1]->getType(), |
| 1068 | NULL); |
| 1069 | return llvm::ConstantStruct::get(STy, Complex); |
| 1070 | } |
| 1071 | case APValue::Vector: { |
| 1072 | SmallVector<llvm::Constant *, 4> Inits; |
| 1073 | unsigned NumElts = Value.getVectorLength(); |
| 1074 | |
| 1075 | for (unsigned i = 0; i != NumElts; ++i) { |
| 1076 | const APValue &Elt = Value.getVectorElt(i); |
| 1077 | if (Elt.isInt()) |
| 1078 | Inits.push_back(llvm::ConstantInt::get(VMContext, Elt.getInt())); |
| 1079 | else |
| 1080 | Inits.push_back(llvm::ConstantFP::get(VMContext, Elt.getFloat())); |
| 1081 | } |
| 1082 | return llvm::ConstantVector::get(Inits); |
| 1083 | } |
| 1084 | case APValue::AddrLabelDiff: { |
| 1085 | const AddrLabelExpr *LHSExpr = Value.getAddrLabelDiffLHS(); |
| 1086 | const AddrLabelExpr *RHSExpr = Value.getAddrLabelDiffRHS(); |
| 1087 | llvm::Constant *LHS = EmitConstantExpr(LHSExpr, LHSExpr->getType(), CGF); |
| 1088 | llvm::Constant *RHS = EmitConstantExpr(RHSExpr, RHSExpr->getType(), CGF); |
| 1089 | |
| 1090 | // Compute difference |
| 1091 | llvm::Type *ResultType = getTypes().ConvertType(DestType); |
| 1092 | LHS = llvm::ConstantExpr::getPtrToInt(LHS, IntPtrTy); |
| 1093 | RHS = llvm::ConstantExpr::getPtrToInt(RHS, IntPtrTy); |
| 1094 | llvm::Constant *AddrLabelDiff = llvm::ConstantExpr::getSub(LHS, RHS); |
| 1095 | |
| 1096 | // LLVM is a bit sensitive about the exact format of the |
| 1097 | // address-of-label difference; make sure to truncate after |
| 1098 | // the subtraction. |
| 1099 | return llvm::ConstantExpr::getTruncOrBitCast(AddrLabelDiff, ResultType); |
| 1100 | } |
| 1101 | case APValue::Struct: |
| 1102 | case APValue::Union: |
| 1103 | return ConstStructBuilder::BuildStruct(*this, CGF, Value, DestType); |
| 1104 | case APValue::Array: { |
| 1105 | const ArrayType *CAT = Context.getAsArrayType(DestType); |
| 1106 | unsigned NumElements = Value.getArraySize(); |
| 1107 | unsigned NumInitElts = Value.getArrayInitializedElts(); |
| 1108 | |
| 1109 | std::vector<llvm::Constant*> Elts; |
| 1110 | Elts.reserve(NumElements); |
| 1111 | |
| 1112 | // Emit array filler, if there is one. |
| 1113 | llvm::Constant *Filler = 0; |
| 1114 | if (Value.hasArrayFiller()) |
| 1115 | Filler = EmitConstantValue(Value.getArrayFiller(), |
| 1116 | CAT->getElementType(), CGF); |
| 1117 | |
| 1118 | // Emit initializer elements. |
| 1119 | llvm::Type *CommonElementType = 0; |
| 1120 | for (unsigned I = 0; I < NumElements; ++I) { |
| 1121 | llvm::Constant *C = Filler; |
| 1122 | if (I < NumInitElts) |
| 1123 | C = EmitConstantValue(Value.getArrayInitializedElt(I), |
| 1124 | CAT->getElementType(), CGF); |
| 1125 | if (I == 0) |
| 1126 | CommonElementType = C->getType(); |
| 1127 | else if (C->getType() != CommonElementType) |
| 1128 | CommonElementType = 0; |
| 1129 | Elts.push_back(C); |
| 1130 | } |
| 1131 | |
| 1132 | if (!CommonElementType) { |
| 1133 | // FIXME: Try to avoid packing the array |
| 1134 | std::vector<llvm::Type*> Types; |
| 1135 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 1136 | Types.push_back(Elts[i]->getType()); |
| 1137 | llvm::StructType *SType = llvm::StructType::get(VMContext, Types, true); |
| 1138 | return llvm::ConstantStruct::get(SType, Elts); |
| 1139 | } |
| 1140 | |
| 1141 | llvm::ArrayType *AType = |
| 1142 | llvm::ArrayType::get(CommonElementType, NumElements); |
| 1143 | return llvm::ConstantArray::get(AType, Elts); |
| 1144 | } |
| 1145 | case APValue::MemberPointer: |
| 1146 | return getCXXABI().EmitMemberPointer(Value, DestType); |
| 1147 | } |
| 1148 | llvm_unreachable("Unknown APValue kind"); |
| 1149 | } |
| 1150 | |
Richard Smith | 7401cf5 | 2011-11-22 22:48:32 +0000 | [diff] [blame] | 1151 | llvm::Constant * |
| 1152 | CodeGenModule::GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *E) { |
| 1153 | assert(E->isFileScope() && "not a file-scope compound literal expr"); |
| 1154 | return ConstExprEmitter(*this, 0).EmitLValue(E); |
| 1155 | } |
| 1156 | |
John McCall | 5808ce4 | 2011-02-03 08:15:49 +0000 | [diff] [blame] | 1157 | llvm::Constant * |
| 1158 | CodeGenModule::getMemberPointerConstant(const UnaryOperator *uo) { |
| 1159 | // Member pointer constants always have a very particular form. |
| 1160 | const MemberPointerType *type = cast<MemberPointerType>(uo->getType()); |
| 1161 | const ValueDecl *decl = cast<DeclRefExpr>(uo->getSubExpr())->getDecl(); |
| 1162 | |
| 1163 | // A member function pointer. |
| 1164 | if (const CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(decl)) |
| 1165 | return getCXXABI().EmitMemberPointer(method); |
| 1166 | |
| 1167 | // Otherwise, a member data pointer. |
Richard Smith | 2d6a567 | 2012-01-14 04:30:29 +0000 | [diff] [blame] | 1168 | uint64_t fieldOffset = getContext().getFieldOffset(decl); |
John McCall | 5808ce4 | 2011-02-03 08:15:49 +0000 | [diff] [blame] | 1169 | CharUnits chars = getContext().toCharUnitsFromBits((int64_t) fieldOffset); |
| 1170 | return getCXXABI().EmitMemberDataPointer(type, chars); |
| 1171 | } |
| 1172 | |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1173 | static void |
| 1174 | FillInNullDataMemberPointers(CodeGenModule &CGM, QualType T, |
| 1175 | std::vector<llvm::Constant *> &Elements, |
| 1176 | uint64_t StartOffset) { |
Ken Dyck | c4d68db | 2011-03-22 00:24:31 +0000 | [diff] [blame] | 1177 | assert(StartOffset % CGM.getContext().getCharWidth() == 0 && |
| 1178 | "StartOffset not byte aligned!"); |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1179 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 1180 | if (CGM.getTypes().isZeroInitializable(T)) |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1181 | return; |
| 1182 | |
| 1183 | if (const ConstantArrayType *CAT = |
| 1184 | CGM.getContext().getAsConstantArrayType(T)) { |
| 1185 | QualType ElementTy = CAT->getElementType(); |
| 1186 | uint64_t ElementSize = CGM.getContext().getTypeSize(ElementTy); |
| 1187 | |
| 1188 | for (uint64_t I = 0, E = CAT->getSize().getZExtValue(); I != E; ++I) { |
| 1189 | FillInNullDataMemberPointers(CGM, ElementTy, Elements, |
| 1190 | StartOffset + I * ElementSize); |
| 1191 | } |
| 1192 | } else if (const RecordType *RT = T->getAs<RecordType>()) { |
| 1193 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 1194 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 1195 | |
| 1196 | // Go through all bases and fill in any null pointer to data members. |
| 1197 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| 1198 | E = RD->bases_end(); I != E; ++I) { |
Anders Carlsson | 0a87b37 | 2010-05-27 18:51:01 +0000 | [diff] [blame] | 1199 | if (I->isVirtual()) { |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1200 | // Ignore virtual bases. |
Anders Carlsson | 0a87b37 | 2010-05-27 18:51:01 +0000 | [diff] [blame] | 1201 | continue; |
| 1202 | } |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1203 | |
| 1204 | const CXXRecordDecl *BaseDecl = |
| 1205 | cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| 1206 | |
| 1207 | // Ignore empty bases. |
| 1208 | if (BaseDecl->isEmpty()) |
| 1209 | continue; |
| 1210 | |
| 1211 | // Ignore bases that don't have any pointer to data members. |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 1212 | if (CGM.getTypes().isZeroInitializable(BaseDecl)) |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1213 | continue; |
| 1214 | |
Anders Carlsson | a14f597 | 2010-10-31 23:22:37 +0000 | [diff] [blame] | 1215 | uint64_t BaseOffset = Layout.getBaseClassOffsetInBits(BaseDecl); |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1216 | FillInNullDataMemberPointers(CGM, I->getType(), |
| 1217 | Elements, StartOffset + BaseOffset); |
| 1218 | } |
| 1219 | |
| 1220 | // Visit all fields. |
| 1221 | unsigned FieldNo = 0; |
| 1222 | for (RecordDecl::field_iterator I = RD->field_begin(), |
| 1223 | E = RD->field_end(); I != E; ++I, ++FieldNo) { |
| 1224 | QualType FieldType = I->getType(); |
| 1225 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 1226 | if (CGM.getTypes().isZeroInitializable(FieldType)) |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1227 | continue; |
| 1228 | |
| 1229 | uint64_t FieldOffset = StartOffset + Layout.getFieldOffset(FieldNo); |
| 1230 | FillInNullDataMemberPointers(CGM, FieldType, Elements, FieldOffset); |
| 1231 | } |
| 1232 | } else { |
| 1233 | assert(T->isMemberPointerType() && "Should only see member pointers here!"); |
| 1234 | assert(!T->getAs<MemberPointerType>()->getPointeeType()->isFunctionType() && |
| 1235 | "Should only see pointers to data members here!"); |
| 1236 | |
Ken Dyck | c4d68db | 2011-03-22 00:24:31 +0000 | [diff] [blame] | 1237 | CharUnits StartIndex = CGM.getContext().toCharUnitsFromBits(StartOffset); |
| 1238 | CharUnits EndIndex = StartIndex + CGM.getContext().getTypeSizeInChars(T); |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1239 | |
John McCall | 5808ce4 | 2011-02-03 08:15:49 +0000 | [diff] [blame] | 1240 | // FIXME: hardcodes Itanium member pointer representation! |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1241 | llvm::Constant *NegativeOne = |
| 1242 | llvm::ConstantInt::get(llvm::Type::getInt8Ty(CGM.getLLVMContext()), |
John McCall | 5808ce4 | 2011-02-03 08:15:49 +0000 | [diff] [blame] | 1243 | -1ULL, /*isSigned*/true); |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1244 | |
| 1245 | // Fill in the null data member pointer. |
Ken Dyck | c4d68db | 2011-03-22 00:24:31 +0000 | [diff] [blame] | 1246 | for (CharUnits I = StartIndex; I != EndIndex; ++I) |
| 1247 | Elements[I.getQuantity()] = NegativeOne; |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1248 | } |
| 1249 | } |
| 1250 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1251 | static llvm::Constant *EmitNullConstantForBase(CodeGenModule &CGM, |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1252 | llvm::Type *baseType, |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1253 | const CXXRecordDecl *base); |
| 1254 | |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1255 | static llvm::Constant *EmitNullConstant(CodeGenModule &CGM, |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1256 | const CXXRecordDecl *record, |
| 1257 | bool asCompleteObject) { |
| 1258 | const CGRecordLayout &layout = CGM.getTypes().getCGRecordLayout(record); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1259 | llvm::StructType *structure = |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1260 | (asCompleteObject ? layout.getLLVMType() |
| 1261 | : layout.getBaseSubobjectLLVMType()); |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1262 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1263 | unsigned numElements = structure->getNumElements(); |
| 1264 | std::vector<llvm::Constant *> elements(numElements); |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1265 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1266 | // Fill in all the bases. |
| 1267 | for (CXXRecordDecl::base_class_const_iterator |
| 1268 | I = record->bases_begin(), E = record->bases_end(); I != E; ++I) { |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1269 | if (I->isVirtual()) { |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1270 | // Ignore virtual bases; if we're laying out for a complete |
| 1271 | // object, we'll lay these out later. |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1272 | continue; |
| 1273 | } |
| 1274 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1275 | const CXXRecordDecl *base = |
| 1276 | cast<CXXRecordDecl>(I->getType()->castAs<RecordType>()->getDecl()); |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1277 | |
| 1278 | // Ignore empty bases. |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1279 | if (base->isEmpty()) |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1280 | continue; |
| 1281 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1282 | unsigned fieldIndex = layout.getNonVirtualBaseLLVMFieldNo(base); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1283 | llvm::Type *baseType = structure->getElementType(fieldIndex); |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1284 | elements[fieldIndex] = EmitNullConstantForBase(CGM, baseType, base); |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1285 | } |
| 1286 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1287 | // Fill in all the fields. |
| 1288 | for (RecordDecl::field_iterator I = record->field_begin(), |
| 1289 | E = record->field_end(); I != E; ++I) { |
| 1290 | const FieldDecl *field = *I; |
Eli Friedman | 26e80cd | 2011-12-07 01:30:11 +0000 | [diff] [blame] | 1291 | |
| 1292 | // Fill in non-bitfields. (Bitfields always use a zero pattern, which we |
| 1293 | // will fill in later.) |
| 1294 | if (!field->isBitField()) { |
| 1295 | unsigned fieldIndex = layout.getLLVMFieldNo(field); |
| 1296 | elements[fieldIndex] = CGM.EmitNullConstant(field->getType()); |
| 1297 | } |
| 1298 | |
| 1299 | // For unions, stop after the first named field. |
| 1300 | if (record->isUnion() && field->getDeclName()) |
| 1301 | break; |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1302 | } |
| 1303 | |
| 1304 | // Fill in the virtual bases, if we're working with the complete object. |
| 1305 | if (asCompleteObject) { |
| 1306 | for (CXXRecordDecl::base_class_const_iterator |
| 1307 | I = record->vbases_begin(), E = record->vbases_end(); I != E; ++I) { |
| 1308 | const CXXRecordDecl *base = |
| 1309 | cast<CXXRecordDecl>(I->getType()->castAs<RecordType>()->getDecl()); |
| 1310 | |
| 1311 | // Ignore empty bases. |
| 1312 | if (base->isEmpty()) |
| 1313 | continue; |
| 1314 | |
| 1315 | unsigned fieldIndex = layout.getVirtualBaseIndex(base); |
| 1316 | |
| 1317 | // We might have already laid this field out. |
| 1318 | if (elements[fieldIndex]) continue; |
| 1319 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1320 | llvm::Type *baseType = structure->getElementType(fieldIndex); |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1321 | elements[fieldIndex] = EmitNullConstantForBase(CGM, baseType, base); |
| 1322 | } |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1323 | } |
| 1324 | |
| 1325 | // Now go through all other fields and zero them out. |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1326 | for (unsigned i = 0; i != numElements; ++i) { |
| 1327 | if (!elements[i]) |
| 1328 | elements[i] = llvm::Constant::getNullValue(structure->getElementType(i)); |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1329 | } |
| 1330 | |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1331 | return llvm::ConstantStruct::get(structure, elements); |
| 1332 | } |
| 1333 | |
| 1334 | /// Emit the null constant for a base subobject. |
| 1335 | static llvm::Constant *EmitNullConstantForBase(CodeGenModule &CGM, |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1336 | llvm::Type *baseType, |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1337 | const CXXRecordDecl *base) { |
| 1338 | const CGRecordLayout &baseLayout = CGM.getTypes().getCGRecordLayout(base); |
| 1339 | |
| 1340 | // Just zero out bases that don't have any pointer to data members. |
| 1341 | if (baseLayout.isZeroInitializableAsBase()) |
| 1342 | return llvm::Constant::getNullValue(baseType); |
| 1343 | |
| 1344 | // If the base type is a struct, we can just use its null constant. |
| 1345 | if (isa<llvm::StructType>(baseType)) { |
| 1346 | return EmitNullConstant(CGM, base, /*complete*/ false); |
| 1347 | } |
| 1348 | |
| 1349 | // Otherwise, some bases are represented as arrays of i8 if the size |
| 1350 | // of the base is smaller than its corresponding LLVM type. Figure |
| 1351 | // out how many elements this base array has. |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1352 | llvm::ArrayType *baseArrayType = cast<llvm::ArrayType>(baseType); |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1353 | unsigned numBaseElements = baseArrayType->getNumElements(); |
| 1354 | |
| 1355 | // Fill in null data member pointers. |
| 1356 | std::vector<llvm::Constant *> baseElements(numBaseElements); |
| 1357 | FillInNullDataMemberPointers(CGM, CGM.getContext().getTypeDeclType(base), |
| 1358 | baseElements, 0); |
| 1359 | |
| 1360 | // Now go through all other elements and zero them out. |
| 1361 | if (numBaseElements) { |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1362 | llvm::Type *i8 = llvm::Type::getInt8Ty(CGM.getLLVMContext()); |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1363 | llvm::Constant *i8_zero = llvm::Constant::getNullValue(i8); |
| 1364 | for (unsigned i = 0; i != numBaseElements; ++i) { |
| 1365 | if (!baseElements[i]) |
| 1366 | baseElements[i] = i8_zero; |
| 1367 | } |
| 1368 | } |
| 1369 | |
| 1370 | return llvm::ConstantArray::get(baseArrayType, baseElements); |
Anders Carlsson | ada4b32 | 2010-11-22 18:42:14 +0000 | [diff] [blame] | 1371 | } |
| 1372 | |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 1373 | llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) { |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 1374 | if (getTypes().isZeroInitializable(T)) |
Anders Carlsson | ad3e711 | 2009-08-24 17:16:23 +0000 | [diff] [blame] | 1375 | return llvm::Constant::getNullValue(getTypes().ConvertTypeForMem(T)); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1376 | |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 1377 | if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(T)) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1378 | |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 1379 | QualType ElementTy = CAT->getElementType(); |
| 1380 | |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1381 | llvm::Constant *Element = EmitNullConstant(ElementTy); |
| 1382 | unsigned NumElements = CAT->getSize().getZExtValue(); |
| 1383 | std::vector<llvm::Constant *> Array(NumElements); |
| 1384 | for (unsigned i = 0; i != NumElements; ++i) |
| 1385 | Array[i] = Element; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1386 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1387 | llvm::ArrayType *ATy = |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1388 | cast<llvm::ArrayType>(getTypes().ConvertTypeForMem(T)); |
| 1389 | return llvm::ConstantArray::get(ATy, Array); |
Anders Carlsson | 237957c | 2009-08-09 18:26:27 +0000 | [diff] [blame] | 1390 | } |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 1391 | |
| 1392 | if (const RecordType *RT = T->getAs<RecordType>()) { |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1393 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
John McCall | 9b7da1c | 2011-02-15 06:40:56 +0000 | [diff] [blame] | 1394 | return ::EmitNullConstant(*this, RD, /*complete object*/ true); |
Anders Carlsson | fc3eaa4 | 2009-08-23 01:25:01 +0000 | [diff] [blame] | 1395 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1396 | |
Anders Carlsson | a83fb4b | 2010-05-18 16:51:41 +0000 | [diff] [blame] | 1397 | assert(T->isMemberPointerType() && "Should only see member pointers here!"); |
Anders Carlsson | 2c12d03 | 2010-02-02 05:17:25 +0000 | [diff] [blame] | 1398 | assert(!T->getAs<MemberPointerType>()->getPointeeType()->isFunctionType() && |
| 1399 | "Should only see pointers to data members here!"); |
| 1400 | |
| 1401 | // Itanium C++ ABI 2.3: |
| 1402 | // A NULL pointer is represented as -1. |
John McCall | 5808ce4 | 2011-02-03 08:15:49 +0000 | [diff] [blame] | 1403 | return getCXXABI().EmitNullMemberPointer(T->castAs<MemberPointerType>()); |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 1404 | } |
Eli Friedman | 2ed7cb6 | 2011-10-14 02:27:24 +0000 | [diff] [blame] | 1405 | |
| 1406 | llvm::Constant * |
| 1407 | CodeGenModule::EmitNullConstantForBase(const CXXRecordDecl *Record) { |
| 1408 | return ::EmitNullConstant(*this, Record, false); |
| 1409 | } |