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" |
| 16 | #include "clang/AST/AST.h" |
| 17 | #include "llvm/Constants.h" |
| 18 | #include "llvm/Function.h" |
| 19 | #include "llvm/GlobalVariable.h" |
| 20 | #include "llvm/Support/Compiler.h" |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 21 | #include "llvm/Target/TargetData.h" |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 22 | using namespace clang; |
| 23 | using namespace CodeGen; |
| 24 | |
| 25 | namespace { |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 26 | class VISIBILITY_HIDDEN ConstExprEmitter : |
| 27 | public StmtVisitor<ConstExprEmitter, llvm::Constant*> { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 28 | CodeGenModule &CGM; |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 29 | CodeGenFunction *CGF; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 30 | public: |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 31 | ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf) |
| 32 | : CGM(cgm), CGF(cgf) { |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | //===--------------------------------------------------------------------===// |
| 36 | // Visitor Methods |
| 37 | //===--------------------------------------------------------------------===// |
| 38 | |
| 39 | llvm::Constant *VisitStmt(Stmt *S) { |
| 40 | CGM.WarnUnsupported(S, "constant expression"); |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 41 | QualType T = cast<Expr>(S)->getType(); |
| 42 | return llvm::UndefValue::get(CGM.getTypes().ConvertType(T)); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | llvm::Constant *VisitParenExpr(ParenExpr *PE) { |
| 46 | return Visit(PE->getSubExpr()); |
| 47 | } |
| 48 | |
| 49 | // Leaves |
| 50 | llvm::Constant *VisitIntegerLiteral(const IntegerLiteral *E) { |
| 51 | return llvm::ConstantInt::get(E->getValue()); |
| 52 | } |
| 53 | llvm::Constant *VisitFloatingLiteral(const FloatingLiteral *E) { |
Chris Lattner | 59138ba | 2008-04-20 00:45:53 +0000 | [diff] [blame] | 54 | return llvm::ConstantFP::get(E->getValue()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 55 | } |
| 56 | llvm::Constant *VisitCharacterLiteral(const CharacterLiteral *E) { |
| 57 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); |
| 58 | } |
| 59 | llvm::Constant *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { |
| 60 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); |
| 61 | } |
| 62 | |
| 63 | llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
| 64 | return Visit(E->getInitializer()); |
| 65 | } |
| 66 | |
| 67 | llvm::Constant *VisitCastExpr(const CastExpr* E) { |
| 68 | llvm::Constant *C = Visit(E->getSubExpr()); |
| 69 | |
| 70 | return EmitConversion(C, E->getSubExpr()->getType(), E->getType()); |
| 71 | } |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 72 | |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 73 | llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 74 | return Visit(DAE->getExpr()); |
| 75 | } |
| 76 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 77 | llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) { |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 78 | std::vector<llvm::Constant*> Elts; |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 79 | const llvm::ArrayType *AType = |
| 80 | cast<llvm::ArrayType>(ConvertType(ILE->getType())); |
Eli Friedman | 4d1c018 | 2008-02-21 17:45:41 +0000 | [diff] [blame] | 81 | unsigned NumInitElements = ILE->getNumInits(); |
| 82 | // FIXME: Check for wide strings |
| 83 | if (NumInitElements > 0 && isa<StringLiteral>(ILE->getInit(0)) && |
| 84 | ILE->getType()->getAsArrayType()->getElementType()->isCharType()) |
| 85 | return Visit(ILE->getInit(0)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 86 | const llvm::Type *ElemTy = AType->getElementType(); |
| 87 | unsigned NumElements = AType->getNumElements(); |
| 88 | |
| 89 | // Initialising an array requires us to automatically |
| 90 | // initialise any elements that have not been initialised explicitly |
| 91 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 92 | |
| 93 | // Copy initializer elements. |
| 94 | unsigned i = 0; |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 95 | bool RewriteType = false; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 96 | for (; i < NumInitableElts; ++i) { |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 97 | llvm::Constant *C = Visit(ILE->getInit(i)); |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 98 | RewriteType |= (C->getType() != ElemTy); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 99 | Elts.push_back(C); |
| 100 | } |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 101 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 102 | // Initialize remaining array elements. |
| 103 | for (; i < NumElements; ++i) |
| 104 | Elts.push_back(llvm::Constant::getNullValue(ElemTy)); |
| 105 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 106 | if (RewriteType) { |
| 107 | // FIXME: Try to avoid packing the array |
| 108 | std::vector<const llvm::Type*> Types; |
| 109 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 110 | Types.push_back(Elts[i]->getType()); |
| 111 | const llvm::StructType *SType = llvm::StructType::get(Types, true); |
| 112 | return llvm::ConstantStruct::get(SType, Elts); |
| 113 | } |
| 114 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 115 | return llvm::ConstantArray::get(AType, Elts); |
| 116 | } |
| 117 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 118 | void InsertBitfieldIntoStruct(std::vector<llvm::Constant*>& Elts, |
| 119 | FieldDecl* Field, Expr* E) { |
| 120 | // Calculate the value to insert |
| 121 | llvm::Constant *C = Visit(E); |
| 122 | llvm::ConstantInt *CI = dyn_cast<llvm::ConstantInt>(C); |
| 123 | if (!CI) { |
| 124 | CGM.WarnUnsupported(E, "bitfield initialization"); |
| 125 | return; |
| 126 | } |
| 127 | llvm::APInt V = CI->getValue(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 128 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 129 | // Calculate information about the relevant field |
| 130 | const llvm::Type* Ty = CI->getType(); |
| 131 | unsigned size = CGM.getTypes().getTargetData().getTypeStoreSizeInBits(Ty); |
| 132 | unsigned fieldOffset = CGM.getTypes().getLLVMFieldNo(Field) * size; |
| 133 | CodeGenTypes::BitFieldInfo bitFieldInfo = |
| 134 | CGM.getTypes().getBitFieldInfo(Field); |
| 135 | fieldOffset += bitFieldInfo.Begin; |
| 136 | |
| 137 | // Find where to start the insertion |
| 138 | // FIXME: This is O(n^2) in the number of bit-fields! |
| 139 | // FIXME: This won't work if the struct isn't completely packed! |
| 140 | unsigned offset = 0, i = 0; |
| 141 | while (offset < (fieldOffset & -8)) |
| 142 | offset += CGM.getTypes().getTargetData().getTypeStoreSizeInBits(Elts[i++]->getType()); |
| 143 | |
| 144 | // Insert the bits into the struct |
| 145 | // FIXME: This algorthm is only correct on X86! |
| 146 | // FIXME: THis algorthm assumes bit-fields only have byte-size elements! |
| 147 | unsigned bitsToInsert = bitFieldInfo.Size; |
| 148 | unsigned curBits = std::min(8 - (fieldOffset & 7), bitsToInsert); |
| 149 | unsigned byte = V.getLoBits(curBits).getZExtValue() << (fieldOffset & 7); |
| 150 | do { |
| 151 | llvm::Constant* byteC = llvm::ConstantInt::get(llvm::Type::Int8Ty, byte); |
| 152 | Elts[i] = llvm::ConstantExpr::getOr(Elts[i], byteC); |
| 153 | ++i; |
| 154 | V = V.lshr(curBits); |
| 155 | bitsToInsert -= curBits; |
| 156 | |
| 157 | if (!bitsToInsert) |
| 158 | break; |
| 159 | |
| 160 | curBits = bitsToInsert > 8 ? 8 : bitsToInsert; |
| 161 | byte = V.getLoBits(curBits).getZExtValue(); |
| 162 | } while (true); |
| 163 | } |
| 164 | |
| 165 | llvm::Constant *EmitStructInitialization(InitListExpr *ILE) { |
| 166 | const llvm::StructType *SType = |
| 167 | cast<llvm::StructType>(ConvertType(ILE->getType())); |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 168 | RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 169 | std::vector<llvm::Constant*> Elts; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 170 | |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 171 | // Initialize the whole structure to zero. |
| 172 | for (unsigned i = 0; i < SType->getNumElements(); ++i) { |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 173 | const llvm::Type *FieldTy = SType->getElementType(i); |
| 174 | Elts.push_back(llvm::Constant::getNullValue(FieldTy)); |
| 175 | } |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 176 | |
| 177 | // Copy initializer elements. Skip padding fields. |
| 178 | unsigned EltNo = 0; // Element no in ILE |
| 179 | int FieldNo = 0; // Field no in RecordDecl |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 180 | bool RewriteType = false; |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 181 | while (EltNo < ILE->getNumInits() && FieldNo < RD->getNumMembers()) { |
| 182 | FieldDecl* curField = RD->getMember(FieldNo); |
| 183 | FieldNo++; |
| 184 | if (!curField->getIdentifier()) |
| 185 | continue; |
| 186 | |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 187 | if (curField->isBitField()) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 188 | InsertBitfieldIntoStruct(Elts, curField, ILE->getInit(EltNo)); |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 189 | } else { |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 190 | unsigned FieldNo = CGM.getTypes().getLLVMFieldNo(curField); |
| 191 | llvm::Constant* C = Visit(ILE->getInit(EltNo)); |
| 192 | RewriteType |= (C->getType() != Elts[FieldNo]->getType()); |
| 193 | Elts[FieldNo] = C; |
Eli Friedman | 017cbdf | 2008-05-20 00:11:07 +0000 | [diff] [blame] | 194 | } |
| 195 | EltNo++; |
| 196 | } |
| 197 | |
Eli Friedman | a04a153 | 2008-05-30 19:58:50 +0000 | [diff] [blame^] | 198 | if (RewriteType) { |
| 199 | // FIXME: Make this work for non-packed structs |
| 200 | assert(SType->isPacked() && "Cannot recreate unpacked structs"); |
| 201 | std::vector<const llvm::Type*> Types; |
| 202 | for (unsigned i = 0; i < Elts.size(); ++i) |
| 203 | Types.push_back(Elts[i]->getType()); |
| 204 | SType = llvm::StructType::get(Types, true); |
| 205 | } |
| 206 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 207 | return llvm::ConstantStruct::get(SType, Elts); |
| 208 | } |
| 209 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 210 | llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 211 | RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl(); |
| 212 | const llvm::Type *Ty = ConvertType(ILE->getType()); |
| 213 | |
| 214 | // Find the field decl we're initializing, if any |
| 215 | int FieldNo = 0; // Field no in RecordDecl |
| 216 | FieldDecl* curField; |
| 217 | do { |
| 218 | curField = RD->getMember(FieldNo); |
| 219 | FieldNo++; |
| 220 | } while (!curField->getIdentifier() && FieldNo < RD->getNumMembers()); |
| 221 | |
| 222 | if (ILE->getNumInits() == 0 || !curField->getIdentifier()) |
| 223 | return llvm::Constant::getNullValue(Ty); |
| 224 | |
| 225 | if (curField->isBitField()) { |
| 226 | // Create a dummy struct for bit-field insertion |
| 227 | unsigned NumElts = CGM.getTargetData().getABITypeSize(Ty) / 8; |
| 228 | llvm::Constant* NV = llvm::Constant::getNullValue(llvm::Type::Int8Ty); |
| 229 | std::vector<llvm::Constant*> Elts(NumElts, NV); |
| 230 | |
| 231 | InsertBitfieldIntoStruct(Elts, curField, ILE->getInit(0)); |
| 232 | const llvm::ArrayType *RetTy = |
| 233 | llvm::ArrayType::get(NV->getType(), NumElts); |
| 234 | return llvm::ConstantArray::get(RetTy, Elts); |
| 235 | } |
| 236 | |
| 237 | llvm::Constant *C = Visit(ILE->getInit(0)); |
| 238 | |
| 239 | // Build a struct with the union sub-element as the first member, |
| 240 | // and padded to the appropriate size |
| 241 | std::vector<llvm::Constant*> Elts; |
| 242 | std::vector<const llvm::Type*> Types; |
| 243 | Elts.push_back(C); |
| 244 | Types.push_back(C->getType()); |
| 245 | unsigned CurSize = CGM.getTargetData().getTypeStoreSize(C->getType()); |
| 246 | unsigned TotalSize = CGM.getTargetData().getTypeStoreSize(Ty); |
| 247 | while (CurSize < TotalSize) { |
| 248 | Elts.push_back(llvm::Constant::getNullValue(llvm::Type::Int8Ty)); |
| 249 | Types.push_back(llvm::Type::Int8Ty); |
| 250 | CurSize++; |
| 251 | } |
| 252 | |
| 253 | // This always generates a packed struct |
| 254 | // FIXME: Try to generate an unpacked struct when we can |
| 255 | llvm::StructType* STy = llvm::StructType::get(Types, true); |
| 256 | return llvm::ConstantStruct::get(STy, Elts); |
| 257 | } |
| 258 | |
| 259 | llvm::Constant *EmitVectorInitialization(InitListExpr *ILE) { |
| 260 | const llvm::VectorType *VType = |
| 261 | cast<llvm::VectorType>(ConvertType(ILE->getType())); |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 262 | const llvm::Type *ElemTy = VType->getElementType(); |
| 263 | std::vector<llvm::Constant*> Elts; |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 264 | unsigned NumElements = VType->getNumElements(); |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 265 | unsigned NumInitElements = ILE->getNumInits(); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 266 | |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 267 | unsigned NumInitableElts = std::min(NumInitElements, NumElements); |
| 268 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 269 | // Copy initializer elements. |
| 270 | unsigned i = 0; |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 271 | for (; i < NumInitableElts; ++i) { |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 272 | llvm::Constant *C = Visit(ILE->getInit(i)); |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 273 | Elts.push_back(C); |
| 274 | } |
| 275 | |
Eli Friedman | cfb313b | 2008-05-30 12:02:14 +0000 | [diff] [blame] | 276 | for (; i < NumElements; ++i) |
| 277 | Elts.push_back(llvm::Constant::getNullValue(ElemTy)); |
| 278 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 279 | return llvm::ConstantVector::get(VType, Elts); |
| 280 | } |
| 281 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 282 | llvm::Constant *VisitInitListExpr(InitListExpr *ILE) { |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 283 | if (ILE->getType()->isScalarType()) { |
| 284 | // We have a scalar in braces. Just use the first element. |
| 285 | if (ILE->getNumInits() > 0) |
Anders Carlsson | f6884ac | 2008-01-29 01:15:48 +0000 | [diff] [blame] | 286 | return Visit(ILE->getInit(0)); |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 287 | |
| 288 | const llvm::Type* RetTy = CGM.getTypes().ConvertType(ILE->getType()); |
| 289 | return llvm::Constant::getNullValue(RetTy); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 290 | } |
Devang Patel | 47fb697 | 2008-01-29 23:23:18 +0000 | [diff] [blame] | 291 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 292 | if (ILE->getType()->isArrayType()) |
| 293 | return EmitArrayInitialization(ILE); |
Devang Patel | 47fb697 | 2008-01-29 23:23:18 +0000 | [diff] [blame] | 294 | |
Eli Friedman | a823400 | 2008-05-30 10:24:46 +0000 | [diff] [blame] | 295 | if (ILE->getType()->isStructureType()) |
| 296 | return EmitStructInitialization(ILE); |
| 297 | |
| 298 | if (ILE->getType()->isUnionType()) |
| 299 | return EmitUnionInitialization(ILE); |
| 300 | |
| 301 | if (ILE->getType()->isVectorType()) |
| 302 | return EmitVectorInitialization(ILE); |
| 303 | |
Devang Patel | eae1560 | 2008-02-05 02:39:50 +0000 | [diff] [blame] | 304 | assert(0 && "Unable to handle InitListExpr"); |
Chris Lattner | 2b94fe3 | 2008-03-01 08:45:05 +0000 | [diff] [blame] | 305 | // Get rid of control reaches end of void function warning. |
| 306 | // Not reached. |
| 307 | return 0; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 308 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 309 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 310 | llvm::Constant *VisitImplicitCastExpr(ImplicitCastExpr *ICExpr) { |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 311 | Expr* SExpr = ICExpr->getSubExpr(); |
| 312 | QualType SType = SExpr->getType(); |
| 313 | llvm::Constant *C; // the intermediate expression |
| 314 | QualType T; // the type of the intermediate expression |
| 315 | if (SType->isArrayType()) { |
| 316 | // Arrays decay to a pointer to the first element |
| 317 | // VLAs would require special handling, but they can't occur here |
| 318 | C = EmitLValue(SExpr); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 319 | llvm::Constant *Idx0 = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 320 | llvm::Constant *Ops[] = {Idx0, Idx0}; |
| 321 | C = llvm::ConstantExpr::getGetElementPtr(C, Ops, 2); |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 322 | |
| 323 | QualType ElemType = SType->getAsArrayType()->getElementType(); |
| 324 | T = CGM.getContext().getPointerType(ElemType); |
| 325 | } else if (SType->isFunctionType()) { |
| 326 | // Function types decay to a pointer to the function |
| 327 | C = EmitLValue(SExpr); |
| 328 | T = CGM.getContext().getPointerType(SType); |
| 329 | } else { |
| 330 | C = Visit(SExpr); |
| 331 | T = SType; |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 332 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 333 | |
| 334 | // Perform the conversion; note that an implicit cast can both promote |
| 335 | // and convert an array/function |
| 336 | return EmitConversion(C, T, ICExpr->getType()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 337 | } |
Eli Friedman | 3b707e7 | 2008-02-21 17:57:49 +0000 | [diff] [blame] | 338 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 339 | llvm::Constant *VisitStringLiteral(StringLiteral *E) { |
| 340 | const char *StrData = E->getStrData(); |
| 341 | unsigned Len = E->getByteLength(); |
Chris Lattner | a7ad98f | 2008-02-11 00:02:17 +0000 | [diff] [blame] | 342 | assert(!E->getType()->isPointerType() && "Strings are always arrays"); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 343 | |
| 344 | // Otherwise this must be a string initializing an array in a static |
| 345 | // initializer. Don't emit it as the address of the string, emit the string |
| 346 | // data itself as an inline array. |
| 347 | const ConstantArrayType *CAT = E->getType()->getAsConstantArrayType(); |
| 348 | assert(CAT && "String isn't pointer or array!"); |
| 349 | |
| 350 | std::string Str(StrData, StrData + Len); |
| 351 | // Null terminate the string before potentially truncating it. |
| 352 | // FIXME: What about wchar_t strings? |
| 353 | Str.push_back(0); |
| 354 | |
| 355 | uint64_t RealLen = CAT->getSize().getZExtValue(); |
| 356 | // String or grow the initializer to the required size. |
| 357 | if (RealLen != Str.size()) |
| 358 | Str.resize(RealLen); |
| 359 | |
| 360 | return llvm::ConstantArray::get(Str, false); |
| 361 | } |
| 362 | |
| 363 | llvm::Constant *VisitDeclRefExpr(DeclRefExpr *E) { |
| 364 | const ValueDecl *Decl = E->getDecl(); |
Anders Carlsson | a3881fc | 2008-01-29 01:28:48 +0000 | [diff] [blame] | 365 | if (const EnumConstantDecl *EC = dyn_cast<EnumConstantDecl>(Decl)) |
| 366 | return llvm::ConstantInt::get(EC->getInitVal()); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 367 | assert(0 && "Unsupported decl ref type!"); |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | llvm::Constant *VisitSizeOfAlignOfTypeExpr(const SizeOfAlignOfTypeExpr *E) { |
| 372 | return EmitSizeAlignOf(E->getArgumentType(), E->getType(), E->isSizeOf()); |
| 373 | } |
| 374 | |
| 375 | // Unary operators |
| 376 | llvm::Constant *VisitUnaryPlus(const UnaryOperator *E) { |
| 377 | return Visit(E->getSubExpr()); |
| 378 | } |
| 379 | llvm::Constant *VisitUnaryMinus(const UnaryOperator *E) { |
| 380 | return llvm::ConstantExpr::getNeg(Visit(E->getSubExpr())); |
| 381 | } |
| 382 | llvm::Constant *VisitUnaryNot(const UnaryOperator *E) { |
| 383 | return llvm::ConstantExpr::getNot(Visit(E->getSubExpr())); |
| 384 | } |
| 385 | llvm::Constant *VisitUnaryLNot(const UnaryOperator *E) { |
| 386 | llvm::Constant *SubExpr = Visit(E->getSubExpr()); |
| 387 | |
| 388 | if (E->getSubExpr()->getType()->isRealFloatingType()) { |
| 389 | // Compare against 0.0 for fp scalars. |
| 390 | llvm::Constant *Zero = llvm::Constant::getNullValue(SubExpr->getType()); |
| 391 | SubExpr = llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UEQ, SubExpr, |
| 392 | Zero); |
| 393 | } else { |
| 394 | assert((E->getSubExpr()->getType()->isIntegerType() || |
| 395 | E->getSubExpr()->getType()->isPointerType()) && |
| 396 | "Unknown scalar type to convert"); |
| 397 | // Compare against an integer or pointer null. |
| 398 | llvm::Constant *Zero = llvm::Constant::getNullValue(SubExpr->getType()); |
| 399 | SubExpr = llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_EQ, SubExpr, |
| 400 | Zero); |
| 401 | } |
| 402 | |
| 403 | return llvm::ConstantExpr::getZExt(SubExpr, ConvertType(E->getType())); |
| 404 | } |
| 405 | llvm::Constant *VisitUnarySizeOf(const UnaryOperator *E) { |
| 406 | return EmitSizeAlignOf(E->getSubExpr()->getType(), E->getType(), true); |
| 407 | } |
| 408 | llvm::Constant *VisitUnaryAlignOf(const UnaryOperator *E) { |
| 409 | return EmitSizeAlignOf(E->getSubExpr()->getType(), E->getType(), false); |
| 410 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 411 | llvm::Constant *VisitUnaryAddrOf(const UnaryOperator *E) { |
| 412 | return EmitLValue(E->getSubExpr()); |
| 413 | } |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 414 | llvm::Constant *VisitUnaryOffsetOf(const UnaryOperator *E) { |
| 415 | int64_t Val = E->evaluateOffsetOf(CGM.getContext()); |
| 416 | |
| 417 | assert(E->getType()->isIntegerType() && "Result type must be an integer!"); |
| 418 | |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 419 | uint32_t ResultWidth = |
| 420 | static_cast<uint32_t>(CGM.getContext().getTypeSize(E->getType())); |
Anders Carlsson | 5a1deb8 | 2008-01-29 15:56:48 +0000 | [diff] [blame] | 421 | return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val)); |
| 422 | } |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 423 | |
| 424 | llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) { |
| 425 | return Visit(E->getSubExpr()); |
| 426 | } |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 427 | |
Anders Carlsson | ce6237e | 2008-01-29 01:33:32 +0000 | [diff] [blame] | 428 | // Binary operators |
| 429 | llvm::Constant *VisitBinOr(const BinaryOperator *E) { |
| 430 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 431 | llvm::Constant *RHS = Visit(E->getRHS()); |
| 432 | |
| 433 | return llvm::ConstantExpr::getOr(LHS, RHS); |
| 434 | } |
Anders Carlsson | 7be3d01 | 2008-02-05 20:54:21 +0000 | [diff] [blame] | 435 | llvm::Constant *VisitBinSub(const BinaryOperator *E) { |
| 436 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 437 | llvm::Constant *RHS = Visit(E->getRHS()); |
| 438 | |
| 439 | if (!isa<llvm::PointerType>(RHS->getType())) { |
| 440 | // pointer - int |
| 441 | if (isa<llvm::PointerType>(LHS->getType())) { |
| 442 | llvm::Constant *Idx = llvm::ConstantExpr::getNeg(RHS); |
| 443 | |
| 444 | return llvm::ConstantExpr::getGetElementPtr(LHS, &Idx, 1); |
| 445 | } |
| 446 | |
| 447 | // int - int |
| 448 | return llvm::ConstantExpr::getSub(LHS, RHS); |
| 449 | } |
| 450 | |
| 451 | assert(0 && "Unhandled bin sub case!"); |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | llvm::Constant *VisitBinShl(const BinaryOperator *E) { |
| 456 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 457 | llvm::Constant *RHS = Visit(E->getRHS()); |
Anders Carlsson | ce6237e | 2008-01-29 01:33:32 +0000 | [diff] [blame] | 458 | |
Anders Carlsson | 7be3d01 | 2008-02-05 20:54:21 +0000 | [diff] [blame] | 459 | // LLVM requires the LHS and RHS to be the same type: promote or truncate the |
| 460 | // RHS to the same size as the LHS. |
| 461 | if (LHS->getType() != RHS->getType()) |
| 462 | RHS = llvm::ConstantExpr::getIntegerCast(RHS, LHS->getType(), false); |
| 463 | |
| 464 | return llvm::ConstantExpr::getShl(LHS, RHS); |
| 465 | } |
| 466 | |
| 467 | llvm::Constant *VisitBinMul(const BinaryOperator *E) { |
| 468 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 469 | llvm::Constant *RHS = Visit(E->getRHS()); |
| 470 | |
| 471 | return llvm::ConstantExpr::getMul(LHS, RHS); |
| 472 | } |
| 473 | |
| 474 | llvm::Constant *VisitBinDiv(const BinaryOperator *E) { |
| 475 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 476 | llvm::Constant *RHS = Visit(E->getRHS()); |
| 477 | |
| 478 | if (LHS->getType()->isFPOrFPVector()) |
| 479 | return llvm::ConstantExpr::getFDiv(LHS, RHS); |
| 480 | else if (E->getType()->isUnsignedIntegerType()) |
| 481 | return llvm::ConstantExpr::getUDiv(LHS, RHS); |
| 482 | else |
| 483 | return llvm::ConstantExpr::getSDiv(LHS, RHS); |
| 484 | } |
| 485 | |
| 486 | llvm::Constant *VisitBinAdd(const BinaryOperator *E) { |
| 487 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 488 | llvm::Constant *RHS = Visit(E->getRHS()); |
| 489 | |
| 490 | if (!E->getType()->isPointerType()) |
| 491 | return llvm::ConstantExpr::getAdd(LHS, RHS); |
| 492 | |
Anders Carlsson | 87a9875 | 2008-02-06 07:23:14 +0000 | [diff] [blame] | 493 | llvm::Constant *Ptr, *Idx; |
| 494 | if (isa<llvm::PointerType>(LHS->getType())) { // pointer + int |
| 495 | Ptr = LHS; |
| 496 | Idx = RHS; |
| 497 | } else { // int + pointer |
| 498 | Ptr = RHS; |
| 499 | Idx = LHS; |
| 500 | } |
| 501 | |
| 502 | return llvm::ConstantExpr::getGetElementPtr(Ptr, &Idx, 1); |
Anders Carlsson | 7be3d01 | 2008-02-05 20:54:21 +0000 | [diff] [blame] | 503 | } |
| 504 | |
| 505 | llvm::Constant *VisitBinAnd(const BinaryOperator *E) { |
| 506 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 507 | llvm::Constant *RHS = Visit(E->getRHS()); |
| 508 | |
| 509 | return llvm::ConstantExpr::getAnd(LHS, RHS); |
| 510 | } |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 511 | |
Eli Friedman | b896596 | 2008-05-29 15:17:49 +0000 | [diff] [blame] | 512 | llvm::Constant *EmitCmp(const BinaryOperator *E, |
| 513 | llvm::CmpInst::Predicate SignedPred, |
| 514 | llvm::CmpInst::Predicate UnsignedPred, |
| 515 | llvm::CmpInst::Predicate FloatPred) { |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 516 | llvm::Constant *LHS = Visit(E->getLHS()); |
| 517 | llvm::Constant *RHS = Visit(E->getRHS()); |
Eli Friedman | b896596 | 2008-05-29 15:17:49 +0000 | [diff] [blame] | 518 | llvm::Constant *Result; |
| 519 | if (LHS->getType()->isInteger() || |
| 520 | isa<llvm::PointerType>(LHS->getType())) { |
| 521 | if (E->getLHS()->getType()->isSignedIntegerType()) |
| 522 | Result = llvm::ConstantExpr::getICmp(SignedPred, LHS, RHS); |
| 523 | else |
| 524 | Result = llvm::ConstantExpr::getICmp(UnsignedPred, LHS, RHS); |
| 525 | } else if (LHS->getType()->isFloatingPoint()) { |
| 526 | Result = llvm::ConstantExpr::getFCmp(FloatPred, LHS, RHS); |
| 527 | } else { |
| 528 | CGM.WarnUnsupported(E, "constant expression"); |
| 529 | Result = llvm::ConstantInt::getFalse(); |
| 530 | } |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 531 | |
| 532 | const llvm::Type* ResultType = ConvertType(E->getType()); |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 533 | return llvm::ConstantExpr::getZExtOrBitCast(Result, ResultType); |
| 534 | } |
| 535 | |
Eli Friedman | b896596 | 2008-05-29 15:17:49 +0000 | [diff] [blame] | 536 | llvm::Constant *VisitBinNE(const BinaryOperator *E) { |
| 537 | return EmitCmp(E, llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_NE, |
| 538 | llvm::CmpInst::FCMP_ONE); |
| 539 | } |
| 540 | |
| 541 | llvm::Constant *VisitBinEQ(const BinaryOperator *E) { |
| 542 | return EmitCmp(E, llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_EQ, |
| 543 | llvm::CmpInst::FCMP_OEQ); |
| 544 | } |
| 545 | |
| 546 | llvm::Constant *VisitBinLT(const BinaryOperator *E) { |
| 547 | return EmitCmp(E, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_ULT, |
| 548 | llvm::CmpInst::FCMP_OLT); |
| 549 | } |
| 550 | |
| 551 | llvm::Constant *VisitBinLE(const BinaryOperator *E) { |
| 552 | return EmitCmp(E, llvm::CmpInst::ICMP_SLE, llvm::CmpInst::ICMP_ULE, |
| 553 | llvm::CmpInst::FCMP_OLE); |
| 554 | } |
| 555 | |
| 556 | llvm::Constant *VisitBinGT(const BinaryOperator *E) { |
| 557 | return EmitCmp(E, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_UGT, |
| 558 | llvm::CmpInst::FCMP_OGT); |
| 559 | } |
| 560 | |
| 561 | llvm::Constant *VisitBinGE(const BinaryOperator *E) { |
| 562 | return EmitCmp(E, llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGE, |
| 563 | llvm::CmpInst::FCMP_OGE); |
| 564 | } |
| 565 | |
Eli Friedman | bc5ed6e | 2008-05-29 11:22:45 +0000 | [diff] [blame] | 566 | llvm::Constant *VisitConditionalOperator(const ConditionalOperator *E) { |
| 567 | llvm::Constant *Cond = Visit(E->getCond()); |
| 568 | llvm::Constant *CondVal = EmitConversionToBool(Cond, E->getType()); |
| 569 | llvm::ConstantInt *CondValInt = dyn_cast<llvm::ConstantInt>(CondVal); |
| 570 | if (!CondValInt) { |
| 571 | CGM.WarnUnsupported(E, "constant expression"); |
| 572 | return llvm::Constant::getNullValue(ConvertType(E->getType())); |
| 573 | } |
| 574 | if (CondValInt->isOne()) { |
| 575 | if (E->getLHS()) |
| 576 | return Visit(E->getLHS()); |
| 577 | return Cond; |
| 578 | } |
| 579 | |
| 580 | return Visit(E->getRHS()); |
| 581 | } |
Anders Carlsson | 7be3d01 | 2008-02-05 20:54:21 +0000 | [diff] [blame] | 582 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 583 | // Utility methods |
| 584 | const llvm::Type *ConvertType(QualType T) { |
| 585 | return CGM.getTypes().ConvertType(T); |
| 586 | } |
| 587 | |
| 588 | llvm::Constant *EmitConversionToBool(llvm::Constant *Src, QualType SrcType) { |
| 589 | assert(SrcType->isCanonical() && "EmitConversion strips typedefs"); |
| 590 | |
| 591 | if (SrcType->isRealFloatingType()) { |
| 592 | // Compare against 0.0 for fp scalars. |
| 593 | llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType()); |
| 594 | return llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UNE, Src, Zero); |
| 595 | } |
| 596 | |
| 597 | assert((SrcType->isIntegerType() || SrcType->isPointerType()) && |
| 598 | "Unknown scalar type to convert"); |
| 599 | |
| 600 | // Compare against an integer or pointer null. |
| 601 | llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType()); |
| 602 | return llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_NE, Src, Zero); |
| 603 | } |
| 604 | |
| 605 | llvm::Constant *EmitConversion(llvm::Constant *Src, QualType SrcType, |
| 606 | QualType DstType) { |
| 607 | SrcType = SrcType.getCanonicalType(); |
| 608 | DstType = DstType.getCanonicalType(); |
| 609 | if (SrcType == DstType) return Src; |
| 610 | |
| 611 | // Handle conversions to bool first, they are special: comparisons against 0. |
| 612 | if (DstType->isBooleanType()) |
| 613 | return EmitConversionToBool(Src, SrcType); |
| 614 | |
| 615 | const llvm::Type *DstTy = ConvertType(DstType); |
| 616 | |
| 617 | // Ignore conversions like int -> uint. |
| 618 | if (Src->getType() == DstTy) |
| 619 | return Src; |
| 620 | |
| 621 | // Handle pointer conversions next: pointers can only be converted to/from |
| 622 | // other pointers and integers. |
| 623 | if (isa<PointerType>(DstType)) { |
| 624 | // The source value may be an integer, or a pointer. |
| 625 | if (isa<llvm::PointerType>(Src->getType())) |
| 626 | return llvm::ConstantExpr::getBitCast(Src, DstTy); |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 627 | assert(SrcType->isIntegerType() &&"Not ptr->ptr or int->ptr conversion?"); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 628 | return llvm::ConstantExpr::getIntToPtr(Src, DstTy); |
| 629 | } |
| 630 | |
| 631 | if (isa<PointerType>(SrcType)) { |
| 632 | // Must be an ptr to int cast. |
| 633 | assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?"); |
| 634 | return llvm::ConstantExpr::getPtrToInt(Src, DstTy); |
| 635 | } |
| 636 | |
| 637 | // A scalar source can be splatted to a vector of the same element type |
| 638 | if (isa<llvm::VectorType>(DstTy) && !isa<VectorType>(SrcType)) { |
| 639 | const llvm::VectorType *VT = cast<llvm::VectorType>(DstTy); |
| 640 | assert((VT->getElementType() == Src->getType()) && |
| 641 | "Vector element type must match scalar type to splat."); |
| 642 | unsigned NumElements = DstType->getAsVectorType()->getNumElements(); |
| 643 | llvm::SmallVector<llvm::Constant*, 16> Elements; |
| 644 | for (unsigned i = 0; i < NumElements; i++) |
| 645 | Elements.push_back(Src); |
| 646 | |
| 647 | return llvm::ConstantVector::get(&Elements[0], NumElements); |
| 648 | } |
| 649 | |
| 650 | if (isa<llvm::VectorType>(Src->getType()) || |
| 651 | isa<llvm::VectorType>(DstTy)) { |
| 652 | return llvm::ConstantExpr::getBitCast(Src, DstTy); |
| 653 | } |
| 654 | |
| 655 | // Finally, we have the arithmetic types: real int/float. |
| 656 | if (isa<llvm::IntegerType>(Src->getType())) { |
| 657 | bool InputSigned = SrcType->isSignedIntegerType(); |
| 658 | if (isa<llvm::IntegerType>(DstTy)) |
| 659 | return llvm::ConstantExpr::getIntegerCast(Src, DstTy, InputSigned); |
| 660 | else if (InputSigned) |
| 661 | return llvm::ConstantExpr::getSIToFP(Src, DstTy); |
| 662 | else |
| 663 | return llvm::ConstantExpr::getUIToFP(Src, DstTy); |
| 664 | } |
| 665 | |
| 666 | assert(Src->getType()->isFloatingPoint() && "Unknown real conversion"); |
| 667 | if (isa<llvm::IntegerType>(DstTy)) { |
| 668 | if (DstType->isSignedIntegerType()) |
| 669 | return llvm::ConstantExpr::getFPToSI(Src, DstTy); |
| 670 | else |
| 671 | return llvm::ConstantExpr::getFPToUI(Src, DstTy); |
| 672 | } |
| 673 | |
| 674 | assert(DstTy->isFloatingPoint() && "Unknown real conversion"); |
| 675 | if (DstTy->getTypeID() < Src->getType()->getTypeID()) |
| 676 | return llvm::ConstantExpr::getFPTrunc(Src, DstTy); |
| 677 | else |
| 678 | return llvm::ConstantExpr::getFPExtend(Src, DstTy); |
| 679 | } |
| 680 | |
| 681 | llvm::Constant *EmitSizeAlignOf(QualType TypeToSize, |
| 682 | QualType RetType, bool isSizeOf) { |
| 683 | std::pair<uint64_t, unsigned> Info = |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 684 | CGM.getContext().getTypeInfo(TypeToSize); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 685 | |
| 686 | uint64_t Val = isSizeOf ? Info.first : Info.second; |
| 687 | Val /= 8; // Return size in bytes, not bits. |
| 688 | |
| 689 | assert(RetType->isIntegerType() && "Result type must be an integer!"); |
| 690 | |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 691 | uint32_t ResultWidth = |
| 692 | static_cast<uint32_t>(CGM.getContext().getTypeSize(RetType)); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 693 | return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val)); |
| 694 | } |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 695 | |
| 696 | llvm::Constant *EmitLValue(Expr *E) { |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 697 | switch (E->getStmtClass()) { |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 698 | default: break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 699 | case Expr::ParenExprClass: |
| 700 | // Elide parenthesis |
| 701 | return EmitLValue(cast<ParenExpr>(E)->getSubExpr()); |
| 702 | case Expr::CompoundLiteralExprClass: { |
| 703 | // Note that due to the nature of compound literals, this is guaranteed |
| 704 | // 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] | 705 | CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); |
| 706 | llvm::Constant* C = Visit(CLE->getInitializer()); |
Chris Lattner | a7ad98f | 2008-02-11 00:02:17 +0000 | [diff] [blame] | 707 | C = new llvm::GlobalVariable(C->getType(),E->getType().isConstQualified(), |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 708 | llvm::GlobalValue::InternalLinkage, |
| 709 | C, ".compoundliteral", &CGM.getModule()); |
| 710 | return C; |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 711 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 712 | case Expr::DeclRefExprClass: { |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 713 | ValueDecl *Decl = cast<DeclRefExpr>(E)->getDecl(); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 714 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl)) |
| 715 | return CGM.GetAddrOfFunctionDecl(FD, false); |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 716 | if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) { |
| 717 | if (VD->isFileVarDecl()) |
| 718 | return CGM.GetAddrOfGlobalVar(VD, false); |
| 719 | else if (VD->isBlockVarDecl()) { |
| 720 | assert(CGF && "Can't access static local vars without CGF"); |
| 721 | return CGF->GetAddrOfStaticLocalVar(VD); |
| 722 | } |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 723 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 724 | break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 725 | } |
| 726 | case Expr::MemberExprClass: { |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 727 | MemberExpr* ME = cast<MemberExpr>(E); |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 728 | llvm::Constant *Base; |
| 729 | if (ME->isArrow()) |
| 730 | Base = Visit(ME->getBase()); |
| 731 | else |
| 732 | Base = EmitLValue(ME->getBase()); |
Lauro Ramos Venancio | 5bfe18c | 2008-01-30 21:23:20 +0000 | [diff] [blame] | 733 | |
| 734 | unsigned FieldNumber = CGM.getTypes().getLLVMFieldNo(ME->getMemberDecl()); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 735 | llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0); |
| 736 | llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, |
| 737 | FieldNumber); |
| 738 | llvm::Value *Ops[] = {Zero, Idx}; |
| 739 | return llvm::ConstantExpr::getGetElementPtr(Base, Ops, 2); |
| 740 | } |
| 741 | case Expr::ArraySubscriptExprClass: { |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 742 | ArraySubscriptExpr* ASExpr = cast<ArraySubscriptExpr>(E); |
| 743 | llvm::Constant *Base = Visit(ASExpr->getBase()); |
| 744 | llvm::Constant *Index = Visit(ASExpr->getIdx()); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 745 | assert(!ASExpr->getBase()->getType()->isVectorType() && |
| 746 | "Taking the address of a vector component is illegal!"); |
| 747 | return llvm::ConstantExpr::getGetElementPtr(Base, &Index, 1); |
| 748 | } |
| 749 | case Expr::StringLiteralClass: { |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 750 | StringLiteral *String = cast<StringLiteral>(E); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 751 | assert(!String->isWide() && "Cannot codegen wide strings yet"); |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 752 | const char *StrData = String->getStrData(); |
| 753 | unsigned Len = String->getByteLength(); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 754 | |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 755 | return CGM.GetAddrOfConstantString(std::string(StrData, StrData + Len)); |
| 756 | } |
| 757 | case Expr::UnaryOperatorClass: { |
| 758 | UnaryOperator *Exp = cast<UnaryOperator>(E); |
| 759 | switch (Exp->getOpcode()) { |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 760 | default: break; |
| 761 | case UnaryOperator::Extension: |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 762 | // Extension is just a wrapper for expressions |
| 763 | return EmitLValue(Exp->getSubExpr()); |
| 764 | case UnaryOperator::Real: |
| 765 | case UnaryOperator::Imag: { |
| 766 | // The address of __real or __imag is just a GEP off the address |
| 767 | // of the internal expression |
| 768 | llvm::Constant* C = EmitLValue(Exp->getSubExpr()); |
| 769 | llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0); |
| 770 | llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 771 | Exp->getOpcode() == UnaryOperator::Imag); |
Anders Carlsson | 84005b4 | 2008-01-26 04:30:23 +0000 | [diff] [blame] | 772 | llvm::Value *Ops[] = {Zero, Idx}; |
| 773 | return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2); |
| 774 | } |
| 775 | case UnaryOperator::Deref: |
| 776 | // The address of a deref is just the value of the expression |
| 777 | return Visit(Exp->getSubExpr()); |
| 778 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 779 | break; |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 780 | } |
Eli Friedman | 546d94c | 2008-02-11 00:23:10 +0000 | [diff] [blame] | 781 | } |
| 782 | CGM.WarnUnsupported(E, "constant l-value expression"); |
| 783 | llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType())); |
| 784 | return llvm::UndefValue::get(Ty); |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 785 | } |
Anders Carlsson | e3d3b7d | 2008-01-26 02:08:50 +0000 | [diff] [blame] | 786 | |
| 787 | }; |
| 788 | |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 789 | } // end anonymous namespace. |
| 790 | |
| 791 | |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 792 | llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E, |
| 793 | CodeGenFunction *CGF) |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 794 | { |
| 795 | QualType type = E->getType().getCanonicalType(); |
| 796 | |
| 797 | if (type->isIntegerType()) { |
Chris Lattner | 98be494 | 2008-03-05 18:54:05 +0000 | [diff] [blame] | 798 | llvm::APSInt Value(static_cast<uint32_t>(Context.getTypeSize(type))); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 799 | if (E->isIntegerConstantExpr(Value, Context)) { |
| 800 | return llvm::ConstantInt::get(Value); |
| 801 | } |
| 802 | } |
| 803 | |
Lauro Ramos Venancio | 8137335 | 2008-02-26 21:41:45 +0000 | [diff] [blame] | 804 | return ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E)); |
Anders Carlsson | 3b1d57b | 2008-01-26 01:36:00 +0000 | [diff] [blame] | 805 | } |