Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 1 | //===--- CGExprConstant.cpp - Emit LLVM Code from Constant Expressions ----===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This contains code to emit Constant Expr nodes as LLVM code. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
| 15 | #include "CodeGenModule.h" |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame] | 16 | #include "CGObjCRuntime.h" |
Chris Lattner | f6b24ea | 2008-10-06 05:59:01 +0000 | [diff] [blame] | 17 | #include "clang/AST/APValue.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 18 | #include "clang/AST/ASTContext.h" |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame^] | 19 | #include "clang/AST/RecordLayout.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 20 | #include "clang/AST/StmtVisitor.h" |
Chris Lattner | 1b63e4f | 2009-06-14 01:54:56 +0000 | [diff] [blame] | 21 | #include "clang/Basic/Builtins.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 22 | #include "llvm/Constants.h" |
| 23 | #include "llvm/Function.h" |
| 24 | #include "llvm/GlobalVariable.h" |
| 25 | #include "llvm/Support/Compiler.h" |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 26 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 27 | using namespace clang; |
| 28 | using namespace CodeGen; |
| 29 | |
| 30 | namespace { |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame^] | 31 | |
| 32 | class VISIBILITY_HIDDEN ConstStructBuilder { |
| 33 | CodeGenModule &CGM; |
| 34 | CodeGenFunction *CGF; |
| 35 | |
| 36 | bool Packed; |
| 37 | unsigned NextFieldOffsetInBytes; |
| 38 | |
| 39 | std::vector<llvm::Constant *> Elements; |
| 40 | |
| 41 | ConstStructBuilder(CodeGenModule &CGM, CodeGenFunction *CGF) |
| 42 | : CGM(CGM), CGF(CGF), Packed(false), NextFieldOffsetInBytes(0) { } |
| 43 | |
| 44 | bool AppendField(const FieldDecl *Field, uint64_t FieldOffset, |
| 45 | const Expr *InitExpr) { |
| 46 | uint64_t FieldOffsetInBytes = FieldOffset / 8; |
| 47 | |
| 48 | assert(NextFieldOffsetInBytes <= FieldOffsetInBytes |
| 49 | && "Field offset mismatch!"); |
| 50 | |
| 51 | // Emit the field. |
| 52 | llvm::Constant *C = CGM.EmitConstantExpr(InitExpr, Field->getType(), CGF); |
| 53 | if (!C) |
| 54 | return false; |
| 55 | |
| 56 | unsigned FieldAlignment = getAlignment(C); |
| 57 | |
| 58 | // Round up the field offset to the alignment of the field type. |
| 59 | uint64_t AlignedNextFieldOffsetInBytes = |
| 60 | llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment); |
| 61 | |
| 62 | if (AlignedNextFieldOffsetInBytes > FieldOffsetInBytes) { |
| 63 | // FIXME: Must convert the struct to a packed struct. |
| 64 | return false; |
| 65 | } |
| 66 | |
| 67 | if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) { |
| 68 | // We need to append padding. |
| 69 | AppendPadding(FieldOffsetInBytes - AlignedNextFieldOffsetInBytes); |
| 70 | |
| 71 | assert(NextFieldOffsetInBytes == FieldOffsetInBytes && |
| 72 | "Did not add enough padding!"); |
| 73 | |
| 74 | AlignedNextFieldOffsetInBytes = NextFieldOffsetInBytes; |
| 75 | } |
| 76 | |
| 77 | // Add the field. |
| 78 | Elements.push_back(C); |
| 79 | NextFieldOffsetInBytes = AlignedNextFieldOffsetInBytes + getSizeInBytes(C); |
| 80 | |
| 81 | return true; |
| 82 | } |
| 83 | |
| 84 | void AppendPadding(uint64_t NumBytes) { |
| 85 | if (!NumBytes) |
| 86 | return; |
| 87 | |
| 88 | const llvm::Type *Ty = llvm::Type::Int8Ty; |
| 89 | if (NumBytes > 1) |
| 90 | Ty = CGM.getLLVMContext().getArrayType(Ty, NumBytes); |
| 91 | |
| 92 | llvm::Constant *C = CGM.getLLVMContext().getNullValue(Ty); |
| 93 | Elements.push_back(C); |
| 94 | assert(getAlignment(C) == 1 && "Padding must have 1 byte alignment!"); |
| 95 | |
| 96 | NextFieldOffsetInBytes += getSizeInBytes(C); |
| 97 | } |
| 98 | |
| 99 | void AppendTailPadding(uint64_t RecordSize) { |
| 100 | assert(RecordSize % 8 == 0 && "Invalid record size!"); |
| 101 | |
| 102 | uint64_t RecordSizeInBytes = RecordSize / 8; |
| 103 | assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!"); |
| 104 | |
| 105 | unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes; |
| 106 | AppendPadding(NumPadBytes); |
| 107 | } |
| 108 | |
| 109 | bool Build(const InitListExpr *ILE) { |
| 110 | RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl(); |
| 111 | const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD); |
| 112 | |
| 113 | unsigned FieldNo = 0; |
| 114 | unsigned ElementNo = 0; |
| 115 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
| 116 | FieldEnd = RD->field_end(); |
| 117 | ElementNo < ILE->getNumInits() && Field != FieldEnd; |
| 118 | ++Field, ++FieldNo) { |
| 119 | if (Field->isBitField()) { |
| 120 | if (!Field->getIdentifier()) |
| 121 | continue; |
| 122 | |
| 123 | // FIXME: Bitfield support. |
| 124 | return false; |
| 125 | } else { |
| 126 | if (!AppendField(*Field, Layout.getFieldOffset(FieldNo), |
| 127 | ILE->getInit(ElementNo))) |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | ElementNo++; |
| 132 | } |
| 133 | |
| 134 | // Append tail padding if necessary. |
| 135 | AppendTailPadding(Layout.getSize()); |
| 136 | |
| 137 | assert(Layout.getSize() / 8 == NextFieldOffsetInBytes && |
| 138 | "Tail padding mismatch!"); |
| 139 | |
| 140 | return true; |
| 141 | } |
| 142 | |
| 143 | unsigned getAlignment(const llvm::Constant *C) const { |
| 144 | if (Packed) |
| 145 | return 1; |
| 146 | |
| 147 | return CGM.getTargetData().getABITypeAlignment(C->getType()); |
| 148 | } |
| 149 | |
| 150 | uint64_t getSizeInBytes(const llvm::Constant *C) const { |
| 151 | return CGM.getTargetData().getTypeAllocSize(C->getType()); |
| 152 | } |
| 153 | |
| 154 | public: |
| 155 | static llvm::Constant *BuildStruct(CodeGenModule &CGM, CodeGenFunction *CGF, |
| 156 | const InitListExpr *ILE) { |
| 157 | ConstStructBuilder Builder(CGM, CGF); |
| 158 | |
| 159 | // FIXME: Use this when it works well enough. |
| 160 | return 0; |
| 161 | |
| 162 | if (!Builder.Build(ILE)) |
| 163 | return 0; |
| 164 | |
| 165 | llvm::Constant *Result = |
| 166 | CGM.getLLVMContext().getConstantStruct(Builder.Elements, Builder.Packed); |
| 167 | |
| 168 | assert(Builder.NextFieldOffsetInBytes == Builder.getSizeInBytes(Result)); |
| 169 | |
| 170 | return 0; |
| 171 | } |
| 172 | }; |
| 173 | |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 174 | class VISIBILITY_HIDDEN ConstExprEmitter : |
| 175 | public StmtVisitor<ConstExprEmitter, llvm::Constant*> { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 176 | CodeGenModule &CGM; |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 177 | CodeGenFunction *CGF; |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 178 | llvm::LLVMContext &VMContext; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 179 | public: |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 180 | ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 181 | : CGM(cgm), CGF(cgf), VMContext(cgm.getLLVMContext()) { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | //===--------------------------------------------------------------------===// |
| 185 | // Visitor Methods |
| 186 | //===--------------------------------------------------------------------===// |
| 187 | |
| 188 | llvm::Constant *VisitStmt(Stmt *S) { |
Anders Carlsson | 069880e | 2009-03-03 16:43:34 +0000 | [diff] [blame] | 189 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | llvm::Constant *VisitParenExpr(ParenExpr *PE) { |
| 193 | return Visit(PE->getSubExpr()); |
| 194 | } |
Anders Carlsson | bcf6225 | 2008-11-22 02:34:39 +0000 | [diff] [blame] | 195 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 196 | llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
| 197 | return Visit(E->getInitializer()); |
| 198 | } |
| 199 | |
Argyrios Kyrtzidis | 0835a3c | 2008-08-18 23:01:59 +0000 | [diff] [blame] | 200 | llvm::Constant *VisitCastExpr(CastExpr* E) { |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 201 | // GCC cast to union extension |
| 202 | if (E->getType()->isUnionType()) { |
| 203 | const llvm::Type *Ty = ConvertType(E->getType()); |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 204 | Expr *SubExpr = E->getSubExpr(); |
| 205 | return EmitUnion(CGM.EmitConstantExpr(SubExpr, SubExpr->getType(), CGF), |
| 206 | Ty); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 207 | } |
Eli Friedman | 944af71 | 2009-04-30 07:03:22 +0000 | [diff] [blame] | 208 | // Explicit and implicit no-op casts |
| 209 | QualType Ty = E->getType(), SubTy = E->getSubExpr()->getType(); |
| 210 | if (CGM.getContext().hasSameUnqualifiedType(Ty, SubTy)) { |
Eli Friedman | ddd2b6e | 2009-02-22 07:29:04 +0000 | [diff] [blame] | 211 | return Visit(E->getSubExpr()); |
| 212 | } |
| 213 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 214 | } |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 215 | |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 216 | llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 217 | return Visit(DAE->getExpr()); |
| 218 | } |
| 219 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 220 | llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) { |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 221 | std::vector<llvm::Constant*> Elts; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 222 | const llvm::ArrayType *AType = |
| 223 | cast<llvm::ArrayType>(ConvertType(ILE->getType())); |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 224 | unsigned NumInitElements = ILE->getNumInits(); |
| 225 | // FIXME: Check for wide strings |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 226 | // FIXME: Check for NumInitElements exactly equal to 1?? |
| 227 | if (NumInitElements > 0 && |
| 228 | (isa<StringLiteral>(ILE->getInit(0)) || |
| 229 | isa<ObjCEncodeExpr>(ILE->getInit(0))) && |
Chris Lattner | c63a1f2 | 2008-08-04 07:31:14 +0000 | [diff] [blame] | 230 | ILE->getType()->getArrayElementTypeNoTypeQual()->isCharType()) |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 231 | return Visit(ILE->getInit(0)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 232 | const llvm::Type *ElemTy = AType->getElementType(); |
| 233 | unsigned NumElements = AType->getNumElements(); |
| 234 | |
| 235 | // Initialising an array requires us to automatically |
| 236 | // initialise any elements that have not been initialised explicitly |
| 237 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 238 | |
| 239 | // Copy initializer elements. |
| 240 | unsigned i = 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 241 | bool RewriteType = false; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 242 | for (; i < NumInitableElts; ++i) { |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 243 | Expr *Init = ILE->getInit(i); |
| 244 | llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 245 | if (!C) |
| 246 | return 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 247 | RewriteType |= (C->getType() != ElemTy); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 248 | Elts.push_back(C); |
| 249 | } |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 250 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 251 | // Initialize remaining array elements. |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 252 | // FIXME: This doesn't handle member pointers correctly! |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 253 | for (; i < NumElements; ++i) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 254 | Elts.push_back(VMContext.getNullValue(ElemTy)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 255 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 256 | if (RewriteType) { |
| 257 | // FIXME: Try to avoid packing the array |
| 258 | std::vector<const llvm::Type*> Types; |
| 259 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 260 | Types.push_back(Elts[i]->getType()); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 261 | const llvm::StructType *SType = VMContext.getStructType(Types, true); |
| 262 | return VMContext.getConstantStruct(SType, Elts); |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 263 | } |
| 264 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 265 | return VMContext.getConstantArray(AType, Elts); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 266 | } |
| 267 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 268 | void InsertBitfieldIntoStruct(std::vector<llvm::Constant*>& Elts, |
| 269 | FieldDecl* Field, Expr* E) { |
| 270 | // Calculate the value to insert |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 271 | llvm::Constant *C = CGM.EmitConstantExpr(E, Field->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 272 | if (!C) |
| 273 | return; |
| 274 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 275 | llvm::ConstantInt *CI = dyn_cast<llvm::ConstantInt>(C); |
| 276 | if (!CI) { |
Daniel Dunbar | 488e993 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 277 | CGM.ErrorUnsupported(E, "bitfield initialization"); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 278 | return; |
| 279 | } |
| 280 | llvm::APInt V = CI->getValue(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 281 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 282 | // Calculate information about the relevant field |
| 283 | const llvm::Type* Ty = CI->getType(); |
Daniel Dunbar | 9ca8bb0 | 2008-08-10 07:00:24 +0000 | [diff] [blame] | 284 | const llvm::TargetData &TD = CGM.getTypes().getTargetData(); |
Duncan Sands | 9408c45 | 2009-05-09 07:08:47 +0000 | [diff] [blame] | 285 | unsigned size = TD.getTypeAllocSizeInBits(Ty); |
Anders Carlsson | 8330cee | 2009-07-23 17:01:21 +0000 | [diff] [blame] | 286 | CodeGenTypes::BitFieldInfo Info = CGM.getTypes().getBitFieldInfo(Field); |
| 287 | unsigned FieldOffset = Info.FieldNo * size; |
| 288 | |
| 289 | FieldOffset += Info.Start; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 290 | |
| 291 | // Find where to start the insertion |
| 292 | // FIXME: This is O(n^2) in the number of bit-fields! |
| 293 | // FIXME: This won't work if the struct isn't completely packed! |
| 294 | unsigned offset = 0, i = 0; |
Anders Carlsson | 8330cee | 2009-07-23 17:01:21 +0000 | [diff] [blame] | 295 | while (offset < (FieldOffset & -8)) |
Duncan Sands | 9408c45 | 2009-05-09 07:08:47 +0000 | [diff] [blame] | 296 | offset += TD.getTypeAllocSizeInBits(Elts[i++]->getType()); |
Daniel Dunbar | 9ca8bb0 | 2008-08-10 07:00:24 +0000 | [diff] [blame] | 297 | |
| 298 | // Advance over 0 sized elements (must terminate in bounds since |
| 299 | // the bitfield must have a size). |
Duncan Sands | 9408c45 | 2009-05-09 07:08:47 +0000 | [diff] [blame] | 300 | while (TD.getTypeAllocSizeInBits(Elts[i]->getType()) == 0) |
Daniel Dunbar | 9ca8bb0 | 2008-08-10 07:00:24 +0000 | [diff] [blame] | 301 | ++i; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 302 | |
Daniel Dunbar | 1f3846e | 2008-07-17 21:07:48 +0000 | [diff] [blame] | 303 | // Promote the size of V if necessary |
Mike Stump | f5408fe | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 304 | // FIXME: This should never occur, but currently it can because initializer |
| 305 | // constants are cast to bool, and because clang is not enforcing bitfield |
| 306 | // width limits. |
Anders Carlsson | 8330cee | 2009-07-23 17:01:21 +0000 | [diff] [blame] | 307 | if (Info.Size > V.getBitWidth()) |
| 308 | V.zext(Info.Size); |
Daniel Dunbar | 1f3846e | 2008-07-17 21:07:48 +0000 | [diff] [blame] | 309 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 310 | // Insert the bits into the struct |
| 311 | // FIXME: This algorthm is only correct on X86! |
| 312 | // FIXME: THis algorthm assumes bit-fields only have byte-size elements! |
Anders Carlsson | 8330cee | 2009-07-23 17:01:21 +0000 | [diff] [blame] | 313 | unsigned bitsToInsert = Info.Size; |
| 314 | unsigned curBits = std::min(8 - (FieldOffset & 7), bitsToInsert); |
| 315 | unsigned byte = V.getLoBits(curBits).getZExtValue() << (FieldOffset & 7); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 316 | do { |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 317 | llvm::Constant* byteC = |
| 318 | VMContext.getConstantInt(llvm::Type::Int8Ty, byte); |
| 319 | Elts[i] = VMContext.getConstantExprOr(Elts[i], byteC); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 320 | ++i; |
| 321 | V = V.lshr(curBits); |
| 322 | bitsToInsert -= curBits; |
| 323 | |
| 324 | if (!bitsToInsert) |
| 325 | break; |
| 326 | |
| 327 | curBits = bitsToInsert > 8 ? 8 : bitsToInsert; |
| 328 | byte = V.getLoBits(curBits).getZExtValue(); |
| 329 | } while (true); |
| 330 | } |
| 331 | |
| 332 | llvm::Constant *EmitStructInitialization(InitListExpr *ILE) { |
Anders Carlsson | 4c98efd | 2009-07-24 15:20:52 +0000 | [diff] [blame^] | 333 | ConstStructBuilder::BuildStruct(CGM, CGF, ILE); |
| 334 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 335 | const llvm::StructType *SType = |
| 336 | cast<llvm::StructType>(ConvertType(ILE->getType())); |
Ted Kremenek | 35366a6 | 2009-07-17 17:50:17 +0000 | [diff] [blame] | 337 | RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 338 | std::vector<llvm::Constant*> Elts; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 339 | |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 340 | // Initialize the whole structure to zero. |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 341 | // FIXME: This doesn't handle member pointers correctly! |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 342 | for (unsigned i = 0; i < SType->getNumElements(); ++i) { |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 343 | const llvm::Type *FieldTy = SType->getElementType(i); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 344 | Elts.push_back(VMContext.getNullValue(FieldTy)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 345 | } |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 346 | |
| 347 | // Copy initializer elements. Skip padding fields. |
| 348 | unsigned EltNo = 0; // Element no in ILE |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 349 | bool RewriteType = false; |
Argyrios Kyrtzidis | 17945a0 | 2009-06-30 02:36:12 +0000 | [diff] [blame] | 350 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
| 351 | FieldEnd = RD->field_end(); |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 352 | EltNo < ILE->getNumInits() && Field != FieldEnd; ++Field) { |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 353 | if (Field->isBitField()) { |
Eli Friedman | 4c4c527 | 2009-06-14 21:41:37 +0000 | [diff] [blame] | 354 | if (!Field->getIdentifier()) |
| 355 | continue; |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 356 | InsertBitfieldIntoStruct(Elts, *Field, ILE->getInit(EltNo)); |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 357 | } else { |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 358 | unsigned FieldNo = CGM.getTypes().getLLVMFieldNo(*Field); |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 359 | llvm::Constant *C = CGM.EmitConstantExpr(ILE->getInit(EltNo), |
| 360 | Field->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 361 | if (!C) return 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 362 | RewriteType |= (C->getType() != Elts[FieldNo]->getType()); |
| 363 | Elts[FieldNo] = C; |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 364 | } |
| 365 | EltNo++; |
| 366 | } |
| 367 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 368 | if (RewriteType) { |
| 369 | // FIXME: Make this work for non-packed structs |
| 370 | assert(SType->isPacked() && "Cannot recreate unpacked structs"); |
| 371 | std::vector<const llvm::Type*> Types; |
| 372 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 373 | Types.push_back(Elts[i]->getType()); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 374 | SType = VMContext.getStructType(Types, true); |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame] | 375 | } |
| 376 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 377 | return VMContext.getConstantStruct(SType, Elts); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 378 | } |
| 379 | |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 380 | llvm::Constant *EmitUnion(llvm::Constant *C, const llvm::Type *Ty) { |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 381 | if (!C) |
| 382 | return 0; |
| 383 | |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 384 | // Build a struct with the union sub-element as the first member, |
| 385 | // and padded to the appropriate size |
| 386 | std::vector<llvm::Constant*> Elts; |
| 387 | std::vector<const llvm::Type*> Types; |
| 388 | Elts.push_back(C); |
| 389 | Types.push_back(C->getType()); |
Duncan Sands | 9408c45 | 2009-05-09 07:08:47 +0000 | [diff] [blame] | 390 | unsigned CurSize = CGM.getTargetData().getTypeAllocSize(C->getType()); |
| 391 | unsigned TotalSize = CGM.getTargetData().getTypeAllocSize(Ty); |
Anders Carlsson | 20d6d04 | 2009-07-23 04:50:01 +0000 | [diff] [blame] | 392 | |
| 393 | assert(CurSize <= TotalSize && "Union size mismatch!"); |
| 394 | if (unsigned NumPadBytes = TotalSize - CurSize) { |
| 395 | const llvm::Type *Ty = llvm::Type::Int8Ty; |
| 396 | if (NumPadBytes > 1) |
| 397 | Ty = VMContext.getArrayType(Ty, NumPadBytes); |
| 398 | |
| 399 | Elts.push_back(VMContext.getNullValue(Ty)); |
| 400 | Types.push_back(Ty); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 401 | } |
| 402 | |
Anders Carlsson | 20d6d04 | 2009-07-23 04:50:01 +0000 | [diff] [blame] | 403 | llvm::StructType* STy = VMContext.getStructType(Types, false); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 404 | return VMContext.getConstantStruct(STy, Elts); |
Nuno Lopes | 81e51e2 | 2009-01-17 00:48:48 +0000 | [diff] [blame] | 405 | } |
| 406 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 407 | llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 408 | const llvm::Type *Ty = ConvertType(ILE->getType()); |
| 409 | |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 410 | FieldDecl* curField = ILE->getInitializedFieldInUnion(); |
| 411 | if (!curField) { |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 412 | // There's no field to initialize, so value-initialize the union. |
| 413 | #ifndef NDEBUG |
| 414 | // Make sure that it's really an empty and not a failure of |
| 415 | // semantic analysis. |
Ted Kremenek | 35366a6 | 2009-07-17 17:50:17 +0000 | [diff] [blame] | 416 | RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl(); |
Argyrios Kyrtzidis | 17945a0 | 2009-06-30 02:36:12 +0000 | [diff] [blame] | 417 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
| 418 | FieldEnd = RD->field_end(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 419 | Field != FieldEnd; ++Field) |
| 420 | assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); |
| 421 | #endif |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 422 | return VMContext.getNullValue(Ty); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 423 | } |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 424 | |
| 425 | if (curField->isBitField()) { |
| 426 | // Create a dummy struct for bit-field insertion |
Duncan Sands | 9408c45 | 2009-05-09 07:08:47 +0000 | [diff] [blame] | 427 | unsigned NumElts = CGM.getTargetData().getTypeAllocSize(Ty); |
Owen Anderson | 6924382 | 2009-07-13 04:10:07 +0000 | [diff] [blame] | 428 | llvm::Constant* NV = |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 429 | VMContext.getNullValue(llvm::Type::Int8Ty); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 430 | std::vector<llvm::Constant*> Elts(NumElts, NV); |
| 431 | |
| 432 | InsertBitfieldIntoStruct(Elts, curField, ILE->getInit(0)); |
| 433 | const llvm::ArrayType *RetTy = |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 434 | VMContext.getArrayType(NV->getType(), NumElts); |
| 435 | return VMContext.getConstantArray(RetTy, Elts); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 436 | } |
| 437 | |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 438 | llvm::Constant *InitElem; |
| 439 | if (ILE->getNumInits() > 0) { |
| 440 | Expr *Init = ILE->getInit(0); |
| 441 | InitElem = CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
| 442 | } else { |
| 443 | InitElem = CGM.EmitNullConstant(curField->getType()); |
| 444 | } |
| 445 | return EmitUnion(InitElem, Ty); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | llvm::Constant *EmitVectorInitialization(InitListExpr *ILE) { |
| 449 | const llvm::VectorType *VType = |
| 450 | cast<llvm::VectorType>(ConvertType(ILE->getType())); |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 451 | const llvm::Type *ElemTy = VType->getElementType(); |
| 452 | std::vector<llvm::Constant*> Elts; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 453 | unsigned NumElements = VType->getNumElements(); |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 454 | unsigned NumInitElements = ILE->getNumInits(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 455 | |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 456 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 457 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 458 | // Copy initializer elements. |
| 459 | unsigned i = 0; |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 460 | for (; i < NumInitableElts; ++i) { |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 461 | Expr *Init = ILE->getInit(i); |
| 462 | llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 463 | if (!C) |
| 464 | return 0; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 465 | Elts.push_back(C); |
| 466 | } |
| 467 | |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 468 | for (; i < NumElements; ++i) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 469 | Elts.push_back(VMContext.getNullValue(ElemTy)); |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 470 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 471 | return VMContext.getConstantVector(VType, Elts); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 472 | } |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 473 | |
| 474 | llvm::Constant *VisitImplicitValueInitExpr(ImplicitValueInitExpr* E) { |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 475 | return CGM.EmitNullConstant(E->getType()); |
Anders Carlsson | 7d801ea | 2009-01-30 06:13:25 +0000 | [diff] [blame] | 476 | } |
| 477 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 478 | llvm::Constant *VisitInitListExpr(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 479 | if (ILE->getType()->isScalarType()) { |
| 480 | // We have a scalar in braces. Just use the first element. |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 481 | if (ILE->getNumInits() > 0) { |
| 482 | Expr *Init = ILE->getInit(0); |
| 483 | return CGM.EmitConstantExpr(Init, Init->getType(), CGF); |
| 484 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 485 | return CGM.EmitNullConstant(ILE->getType()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 486 | } |
Chris Lattner | be20bb5 | 2008-10-26 23:53:12 +0000 | [diff] [blame] | 487 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 488 | if (ILE->getType()->isArrayType()) |
| 489 | return EmitArrayInitialization(ILE); |
Devang Patel | 47fb697 | 2008-01-29 23:23:18 +0000 | [diff] [blame] | 490 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 491 | if (ILE->getType()->isStructureType()) |
| 492 | return EmitStructInitialization(ILE); |
| 493 | |
| 494 | if (ILE->getType()->isUnionType()) |
| 495 | return EmitUnionInitialization(ILE); |
| 496 | |
| 497 | if (ILE->getType()->isVectorType()) |
| 498 | return EmitVectorInitialization(ILE); |
| 499 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 500 | assert(0 && "Unable to handle InitListExpr"); |
Chris Lattner | 2b94fe3 | 2008-03-01 08:45:05 +0000 | [diff] [blame] | 501 | // Get rid of control reaches end of void function warning. |
| 502 | // Not reached. |
| 503 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 504 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 505 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 506 | llvm::Constant *VisitStringLiteral(StringLiteral *E) { |
Chris Lattner | a7ad98f | 2008-02-11 00:02:17 +0000 | [diff] [blame] | 507 | assert(!E->getType()->isPointerType() && "Strings are always arrays"); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 508 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 509 | // This must be a string initializing an array in a static initializer. |
| 510 | // Don't emit it as the address of the string, emit the string data itself |
| 511 | // as an inline array. |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 512 | return VMContext.getConstantArray(CGM.GetStringForStringLiteral(E), false); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 513 | } |
| 514 | |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 515 | llvm::Constant *VisitObjCEncodeExpr(ObjCEncodeExpr *E) { |
| 516 | // This must be an @encode initializing an array in a static initializer. |
| 517 | // Don't emit it as the address of the string, emit the string data itself |
| 518 | // as an inline array. |
| 519 | std::string Str; |
| 520 | CGM.getContext().getObjCEncodingForType(E->getEncodedType(), Str); |
| 521 | const ConstantArrayType *CAT = cast<ConstantArrayType>(E->getType()); |
| 522 | |
| 523 | // Resize the string to the right size, adding zeros at the end, or |
| 524 | // truncating as needed. |
| 525 | Str.resize(CAT->getSize().getZExtValue(), '\0'); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 526 | return VMContext.getConstantArray(Str, false); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 527 | } |
| 528 | |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 529 | llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) { |
| 530 | return Visit(E->getSubExpr()); |
| 531 | } |
Mike Stump | b83d287 | 2009-02-19 22:01:56 +0000 | [diff] [blame] | 532 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 533 | // Utility methods |
| 534 | const llvm::Type *ConvertType(QualType T) { |
| 535 | return CGM.getTypes().ConvertType(T); |
| 536 | } |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 537 | |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 538 | public: |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 539 | llvm::Constant *EmitLValue(Expr *E) { |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 540 | switch (E->getStmtClass()) { |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 541 | default: break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 542 | case Expr::CompoundLiteralExprClass: { |
| 543 | // Note that due to the nature of compound literals, this is guaranteed |
| 544 | // to be the only use of the variable, so we just generate it here. |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 545 | CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); |
| 546 | llvm::Constant* C = Visit(CLE->getInitializer()); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 547 | // FIXME: "Leaked" on failure. |
| 548 | if (C) |
Owen Anderson | 1c431b3 | 2009-07-08 19:05:04 +0000 | [diff] [blame] | 549 | C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 550 | E->getType().isConstQualified(), |
| 551 | llvm::GlobalValue::InternalLinkage, |
Owen Anderson | 1c431b3 | 2009-07-08 19:05:04 +0000 | [diff] [blame] | 552 | C, ".compoundliteral"); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 553 | return C; |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 554 | } |
Douglas Gregor | 1a49af9 | 2009-01-06 05:10:23 +0000 | [diff] [blame] | 555 | case Expr::DeclRefExprClass: |
| 556 | case Expr::QualifiedDeclRefExprClass: { |
Douglas Gregor | 8e9bebd | 2008-10-21 16:13:35 +0000 | [diff] [blame] | 557 | NamedDecl *Decl = cast<DeclRefExpr>(E)->getDecl(); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 558 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl)) |
Chris Lattner | b4880ba | 2009-05-12 21:21:08 +0000 | [diff] [blame] | 559 | return CGM.GetAddrOfFunction(GlobalDecl(FD)); |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 560 | if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) { |
Daniel Dunbar | d01b669 | 2009-02-24 18:41:57 +0000 | [diff] [blame] | 561 | // We can never refer to a variable with local storage. |
| 562 | if (!VD->hasLocalStorage()) { |
| 563 | if (VD->isFileVarDecl() || VD->hasExternalStorage()) |
| 564 | return CGM.GetAddrOfGlobalVar(VD); |
| 565 | else if (VD->isBlockVarDecl()) { |
| 566 | assert(CGF && "Can't access static local vars without CGF"); |
| 567 | return CGF->GetAddrOfStaticLocalVar(VD); |
| 568 | } |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 569 | } |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 570 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 571 | break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 572 | } |
Daniel Dunbar | 6143293 | 2008-08-13 23:20:05 +0000 | [diff] [blame] | 573 | case Expr::StringLiteralClass: |
| 574 | return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E)); |
Chris Lattner | eaf2bb8 | 2009-02-24 22:18:39 +0000 | [diff] [blame] | 575 | case Expr::ObjCEncodeExprClass: |
| 576 | return CGM.GetAddrOfConstantStringFromObjCEncode(cast<ObjCEncodeExpr>(E)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 577 | case Expr::ObjCStringLiteralClass: { |
| 578 | ObjCStringLiteral* SL = cast<ObjCStringLiteral>(E); |
Steve Naroff | 33fdb73 | 2009-03-31 16:53:37 +0000 | [diff] [blame] | 579 | llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(SL); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 580 | return VMContext.getConstantExprBitCast(C, ConvertType(E->getType())); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 581 | } |
Chris Lattner | 3534564 | 2008-12-12 05:18:02 +0000 | [diff] [blame] | 582 | case Expr::PredefinedExprClass: { |
| 583 | // __func__/__FUNCTION__ -> "". __PRETTY_FUNCTION__ -> "top level". |
| 584 | std::string Str; |
| 585 | if (cast<PredefinedExpr>(E)->getIdentType() == |
| 586 | PredefinedExpr::PrettyFunction) |
| 587 | Str = "top level"; |
| 588 | |
| 589 | return CGM.GetAddrOfConstantCString(Str, ".tmp"); |
| 590 | } |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 591 | case Expr::AddrLabelExprClass: { |
| 592 | assert(CGF && "Invalid address of label expression outside function."); |
| 593 | unsigned id = CGF->GetIDForAddrOfLabel(cast<AddrLabelExpr>(E)->getLabel()); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 594 | llvm::Constant *C = VMContext.getConstantInt(llvm::Type::Int32Ty, id); |
| 595 | return VMContext.getConstantExprIntToPtr(C, ConvertType(E->getType())); |
Eli Friedman | f011589 | 2009-01-25 01:21:06 +0000 | [diff] [blame] | 596 | } |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 597 | case Expr::CallExprClass: { |
| 598 | CallExpr* CE = cast<CallExpr>(E); |
Douglas Gregor | 3c385e5 | 2009-02-14 18:57:46 +0000 | [diff] [blame] | 599 | if (CE->isBuiltinCall(CGM.getContext()) != |
| 600 | Builtin::BI__builtin___CFStringMakeConstantString) |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 601 | break; |
| 602 | const Expr *Arg = CE->getArg(0)->IgnoreParenCasts(); |
| 603 | const StringLiteral *Literal = cast<StringLiteral>(Arg); |
Steve Naroff | 33fdb73 | 2009-03-31 16:53:37 +0000 | [diff] [blame] | 604 | // FIXME: need to deal with UCN conversion issues. |
Steve Naroff | 8d4141f | 2009-04-01 13:55:36 +0000 | [diff] [blame] | 605 | return CGM.GetAddrOfConstantCFString(Literal); |
Eli Friedman | 3941b18 | 2009-01-25 01:54:01 +0000 | [diff] [blame] | 606 | } |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 607 | case Expr::BlockExprClass: { |
Anders Carlsson | 4de9fce | 2009-03-01 01:09:12 +0000 | [diff] [blame] | 608 | std::string FunctionName; |
| 609 | if (CGF) |
| 610 | FunctionName = CGF->CurFn->getName(); |
| 611 | else |
| 612 | FunctionName = "global"; |
| 613 | |
| 614 | return CGM.GetAddrOfGlobalBlock(cast<BlockExpr>(E), FunctionName.c_str()); |
Mike Stump | bd65cac | 2009-02-19 01:01:04 +0000 | [diff] [blame] | 615 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 616 | } |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 617 | |
| 618 | return 0; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 619 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 620 | }; |
| 621 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 622 | } // end anonymous namespace. |
| 623 | |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 624 | llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E, |
Anders Carlsson | e9352cc | 2009-04-08 04:48:15 +0000 | [diff] [blame] | 625 | QualType DestType, |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 626 | CodeGenFunction *CGF) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 627 | Expr::EvalResult Result; |
| 628 | |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 629 | bool Success = false; |
| 630 | |
Eli Friedman | 50c39ea | 2009-05-27 06:04:58 +0000 | [diff] [blame] | 631 | if (DestType->isReferenceType()) |
| 632 | Success = E->EvaluateAsLValue(Result, Context); |
| 633 | else |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 634 | Success = E->Evaluate(Result, Context); |
| 635 | |
| 636 | if (Success) { |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 637 | assert(!Result.HasSideEffects && |
| 638 | "Constant expr should not have any side effects!"); |
| 639 | switch (Result.Val.getKind()) { |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 640 | case APValue::Uninitialized: |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 641 | assert(0 && "Constant expressions should be initialized."); |
| 642 | return 0; |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 643 | case APValue::LValue: { |
Anders Carlsson | 1e5dc6e | 2009-04-11 01:08:03 +0000 | [diff] [blame] | 644 | const llvm::Type *DestTy = getTypes().ConvertTypeForMem(DestType); |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 645 | llvm::Constant *Offset = |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 646 | VMContext.getConstantInt(llvm::Type::Int64Ty, |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 647 | Result.Val.getLValueOffset()); |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 648 | |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 649 | llvm::Constant *C; |
Anders Carlsson | 4b3f9c0 | 2008-12-01 02:42:14 +0000 | [diff] [blame] | 650 | if (const Expr *LVBase = Result.Val.getLValueBase()) { |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 651 | C = ConstExprEmitter(*this, CGF).EmitLValue(const_cast<Expr*>(LVBase)); |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 652 | |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 653 | // Apply offset if necessary. |
| 654 | if (!Offset->isNullValue()) { |
| 655 | const llvm::Type *Type = |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 656 | VMContext.getPointerTypeUnqual(llvm::Type::Int8Ty); |
| 657 | llvm::Constant *Casted = VMContext.getConstantExprBitCast(C, Type); |
| 658 | Casted = VMContext.getConstantExprGetElementPtr(Casted, &Offset, 1); |
| 659 | C = VMContext.getConstantExprBitCast(Casted, C->getType()); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | // Convert to the appropriate type; this could be an lvalue for |
| 663 | // an integer. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 664 | if (isa<llvm::PointerType>(DestTy)) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 665 | return VMContext.getConstantExprBitCast(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 666 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 667 | return VMContext.getConstantExprPtrToInt(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 668 | } else { |
| 669 | C = Offset; |
| 670 | |
| 671 | // Convert to the appropriate type; this could be an lvalue for |
| 672 | // an integer. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 673 | if (isa<llvm::PointerType>(DestTy)) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 674 | return VMContext.getConstantExprIntToPtr(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 675 | |
| 676 | // If the types don't match this should only be a truncate. |
Anders Carlsson | 12e330c | 2009-04-10 04:59:59 +0000 | [diff] [blame] | 677 | if (C->getType() != DestTy) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 678 | return VMContext.getConstantExprTrunc(C, DestTy); |
Daniel Dunbar | e20de51 | 2009-02-19 21:44:24 +0000 | [diff] [blame] | 679 | |
| 680 | return C; |
Anders Carlsson | 5ea7d07 | 2008-11-16 06:23:45 +0000 | [diff] [blame] | 681 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 682 | } |
Eli Friedman | 7b30b1c | 2008-11-17 03:57:28 +0000 | [diff] [blame] | 683 | case APValue::Int: { |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 684 | llvm::Constant *C = VMContext.getConstantInt(Result.Val.getInt()); |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 685 | |
| 686 | if (C->getType() == llvm::Type::Int1Ty) { |
| 687 | const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 688 | C = VMContext.getConstantExprZExt(C, BoolTy); |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 689 | } |
| 690 | return C; |
Eli Friedman | 7b30b1c | 2008-11-17 03:57:28 +0000 | [diff] [blame] | 691 | } |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 692 | case APValue::ComplexInt: { |
| 693 | llvm::Constant *Complex[2]; |
| 694 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 695 | Complex[0] = VMContext.getConstantInt(Result.Val.getComplexIntReal()); |
| 696 | Complex[1] = VMContext.getConstantInt(Result.Val.getComplexIntImag()); |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 697 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 698 | return VMContext.getConstantStruct(Complex, 2); |
Daniel Dunbar | a5fd07b | 2009-01-28 22:24:07 +0000 | [diff] [blame] | 699 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 700 | case APValue::Float: |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 701 | return VMContext.getConstantFP(Result.Val.getFloat()); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 702 | case APValue::ComplexFloat: { |
| 703 | llvm::Constant *Complex[2]; |
| 704 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 705 | Complex[0] = VMContext.getConstantFP(Result.Val.getComplexFloatReal()); |
| 706 | Complex[1] = VMContext.getConstantFP(Result.Val.getComplexFloatImag()); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 707 | |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 708 | return VMContext.getConstantStruct(Complex, 2); |
Anders Carlsson | aa43256 | 2008-11-17 01:58:55 +0000 | [diff] [blame] | 709 | } |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 710 | case APValue::Vector: { |
| 711 | llvm::SmallVector<llvm::Constant *, 4> Inits; |
| 712 | unsigned NumElts = Result.Val.getVectorLength(); |
| 713 | |
| 714 | for (unsigned i = 0; i != NumElts; ++i) { |
| 715 | APValue &Elt = Result.Val.getVectorElt(i); |
| 716 | if (Elt.isInt()) |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 717 | Inits.push_back(VMContext.getConstantInt(Elt.getInt())); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 718 | else |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 719 | Inits.push_back(VMContext.getConstantFP(Elt.getFloat())); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 720 | } |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 721 | return VMContext.getConstantVector(&Inits[0], Inits.size()); |
Nate Begeman | 3d309f9 | 2009-01-18 01:01:34 +0000 | [diff] [blame] | 722 | } |
Anders Carlsson | 5a9a457 | 2008-11-15 20:45:50 +0000 | [diff] [blame] | 723 | } |
| 724 | } |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 725 | |
| 726 | llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E)); |
Daniel Dunbar | d60f2fb | 2009-02-17 18:43:32 +0000 | [diff] [blame] | 727 | if (C && C->getType() == llvm::Type::Int1Ty) { |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 728 | const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType()); |
Owen Anderson | a1cf15f | 2009-07-14 23:10:40 +0000 | [diff] [blame] | 729 | C = VMContext.getConstantExprZExt(C, BoolTy); |
Eli Friedman | 7dfa639 | 2008-06-01 15:31:44 +0000 | [diff] [blame] | 730 | } |
| 731 | return C; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 732 | } |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 733 | |
| 734 | llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) { |
| 735 | // Always return an LLVM null constant for now; this will change when we |
| 736 | // get support for IRGen of member pointers. |
Owen Anderson | 6924382 | 2009-07-13 04:10:07 +0000 | [diff] [blame] | 737 | return getLLVMContext().getNullValue(getTypes().ConvertType(T)); |
Eli Friedman | 0f59312 | 2009-04-13 21:47:26 +0000 | [diff] [blame] | 738 | } |