1 //===---- llvm/Support/TypeBuilder.h - Builder for LLVM types ---*- C++ -*-===// 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 file defines the TypeBuilder class, which is used as a convenient way to 11 // create LLVM types with a consistent and simplified interface. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_SUPPORT_TYPEBUILDER_H 16 #define LLVM_SUPPORT_TYPEBUILDER_H 17 18 #include "llvm/DerivedTypes.h" 19 #include "llvm/LLVMContext.h" 20 #include <limits.h> 21 22 namespace llvm { 23 24 /// TypeBuilder - This provides a uniform API for looking up types 25 /// known at compile time. To support cross-compilation, we define a 26 /// series of tag types in the llvm::types namespace, like i<N>, 27 /// ieee_float, ppc_fp128, etc. TypeBuilder<T, false> allows T to be 28 /// any of these, a native C type (whose size may depend on the host 29 /// compiler), or a pointer, function, or struct type built out of 30 /// these. TypeBuilder<T, true> removes native C types from this set 31 /// to guarantee that its result is suitable for cross-compilation. 32 /// We define the primitive types, pointer types, and functions up to 33 /// 5 arguments here, but to use this class with your own types, 34 /// you'll need to specialize it. For example, say you want to call a 35 /// function defined externally as: 36 /// 37 /// struct MyType { 38 /// int32 a; 39 /// int32 *b; 40 /// void *array[1]; // Intended as a flexible array. 41 /// }; 42 /// int8 AFunction(struct MyType *value); 43 /// 44 /// You'll want to use 45 /// Function::Create(TypeBuilder<types::i<8>(MyType*), true>::get(), ...) 46 /// to declare the function, but when you first try this, your compiler will 47 /// complain that TypeBuilder<MyType, true>::get() doesn't exist. To fix this, 48 /// write: 49 /// 50 /// namespace llvm { 51 /// template<bool xcompile> class TypeBuilder<MyType, xcompile> { 52 /// public: 53 /// static StructType *get(LLVMContext &Context) { 54 /// // If you cache this result, be sure to cache it separately 55 /// // for each LLVMContext. 56 /// return StructType::get( 57 /// TypeBuilder<types::i<32>, xcompile>::get(Context), 58 /// TypeBuilder<types::i<32>*, xcompile>::get(Context), 59 /// TypeBuilder<types::i<8>*[], xcompile>::get(Context), 60 /// NULL); 61 /// } 62 /// 63 /// // You may find this a convenient place to put some constants 64 /// // to help with getelementptr. They don't have any effect on 65 /// // the operation of TypeBuilder. 66 /// enum Fields { 67 /// FIELD_A, 68 /// FIELD_B, 69 /// FIELD_ARRAY 70 /// }; 71 /// } 72 /// } // namespace llvm 73 /// 74 /// TypeBuilder cannot handle recursive types or types you only know at runtime. 75 /// If you try to give it a recursive type, it will deadlock, infinitely 76 /// recurse, or do something similarly undesirable. 77 template<typename T, bool cross_compilable> class TypeBuilder {}; 78 79 // Types for use with cross-compilable TypeBuilders. These correspond 80 // exactly with an LLVM-native type. 81 namespace types { 82 /// i<N> corresponds to the LLVM IntegerType with N bits. 83 template<uint32_t num_bits> class i {}; 84 85 // The following classes represent the LLVM floating types. 86 class ieee_float {}; 87 class ieee_double {}; 88 class x86_fp80 {}; 89 class fp128 {}; 90 class ppc_fp128 {}; 91 // X86 MMX. 92 class x86_mmx {}; 93 } // namespace types 94 95 // LLVM doesn't have const or volatile types. 96 template<typename T, bool cross> class TypeBuilder<const T, cross> 97 : public TypeBuilder<T, cross> {}; 98 template<typename T, bool cross> class TypeBuilder<volatile T, cross> 99 : public TypeBuilder<T, cross> {}; 100 template<typename T, bool cross> class TypeBuilder<const volatile T, cross> 101 : public TypeBuilder<T, cross> {}; 102 103 // Pointers 104 template<typename T, bool cross> class TypeBuilder<T*, cross> { 105 public: 106 static PointerType *get(LLVMContext &Context) { 107 return PointerType::getUnqual(TypeBuilder<T,cross>::get(Context)); 108 } 109 }; 110 111 /// There is no support for references 112 template<typename T, bool cross> class TypeBuilder<T&, cross> {}; 113 114 // Arrays 115 template<typename T, size_t N, bool cross> class TypeBuilder<T[N], cross> { 116 public: 117 static ArrayType *get(LLVMContext &Context) { 118 return ArrayType::get(TypeBuilder<T, cross>::get(Context), N); 119 } 120 }; 121 /// LLVM uses an array of length 0 to represent an unknown-length array. 122 template<typename T, bool cross> class TypeBuilder<T[], cross> { 123 public: 124 static ArrayType *get(LLVMContext &Context) { 125 return ArrayType::get(TypeBuilder<T, cross>::get(Context), 0); 126 } 127 }; 128 129 // Define the C integral types only for TypeBuilder<T, false>. 130 // 131 // C integral types do not have a defined size. It would be nice to use the 132 // stdint.h-defined typedefs that do have defined sizes, but we'd run into the 133 // following problem: 134 // 135 // On an ILP32 machine, stdint.h might define: 136 // 137 // typedef int int32_t; 138 // typedef long long int64_t; 139 // typedef long size_t; 140 // 141 // If we defined TypeBuilder<int32_t> and TypeBuilder<int64_t>, then any use of 142 // TypeBuilder<size_t> would fail. We couldn't define TypeBuilder<size_t> in 143 // addition to the defined-size types because we'd get duplicate definitions on 144 // platforms where stdint.h instead defines: 145 // 146 // typedef int int32_t; 147 // typedef long long int64_t; 148 // typedef int size_t; 149 // 150 // So we define all the primitive C types and nothing else. 151 #define DEFINE_INTEGRAL_TYPEBUILDER(T) \ 152 template<> class TypeBuilder<T, false> { \ 153 public: \ 154 static IntegerType *get(LLVMContext &Context) { \ 155 return IntegerType::get(Context, sizeof(T) * CHAR_BIT); \ 156 } \ 157 }; \ 158 template<> class TypeBuilder<T, true> { \ 159 /* We provide a definition here so users don't accidentally */ \ 160 /* define these types to work. */ \ 161 } 162 DEFINE_INTEGRAL_TYPEBUILDER(char); 163 DEFINE_INTEGRAL_TYPEBUILDER(signed char); 164 DEFINE_INTEGRAL_TYPEBUILDER(unsigned char); 165 DEFINE_INTEGRAL_TYPEBUILDER(short); 166 DEFINE_INTEGRAL_TYPEBUILDER(unsigned short); 167 DEFINE_INTEGRAL_TYPEBUILDER(int); 168 DEFINE_INTEGRAL_TYPEBUILDER(unsigned int); 169 DEFINE_INTEGRAL_TYPEBUILDER(long); 170 DEFINE_INTEGRAL_TYPEBUILDER(unsigned long); 171 #ifdef _MSC_VER 172 DEFINE_INTEGRAL_TYPEBUILDER(__int64); 173 DEFINE_INTEGRAL_TYPEBUILDER(unsigned __int64); 174 #else /* _MSC_VER */ 175 DEFINE_INTEGRAL_TYPEBUILDER(long long); 176 DEFINE_INTEGRAL_TYPEBUILDER(unsigned long long); 177 #endif /* _MSC_VER */ 178 #undef DEFINE_INTEGRAL_TYPEBUILDER 179 180 template<uint32_t num_bits, bool cross> 181 class TypeBuilder<types::i<num_bits>, cross> { 182 public: 183 static IntegerType *get(LLVMContext &C) { 184 return IntegerType::get(C, num_bits); 185 } 186 }; 187 188 template<> class TypeBuilder<float, false> { 189 public: 190 static Type *get(LLVMContext& C) { 191 return Type::getFloatTy(C); 192 } 193 }; 194 template<> class TypeBuilder<float, true> {}; 195 196 template<> class TypeBuilder<double, false> { 197 public: 198 static Type *get(LLVMContext& C) { 199 return Type::getDoubleTy(C); 200 } 201 }; 202 template<> class TypeBuilder<double, true> {}; 203 204 template<bool cross> class TypeBuilder<types::ieee_float, cross> { 205 public: 206 static Type *get(LLVMContext& C) { return Type::getFloatTy(C); } 207 }; 208 template<bool cross> class TypeBuilder<types::ieee_double, cross> { 209 public: 210 static Type *get(LLVMContext& C) { return Type::getDoubleTy(C); } 211 }; 212 template<bool cross> class TypeBuilder<types::x86_fp80, cross> { 213 public: 214 static Type *get(LLVMContext& C) { return Type::getX86_FP80Ty(C); } 215 }; 216 template<bool cross> class TypeBuilder<types::fp128, cross> { 217 public: 218 static Type *get(LLVMContext& C) { return Type::getFP128Ty(C); } 219 }; 220 template<bool cross> class TypeBuilder<types::ppc_fp128, cross> { 221 public: 222 static Type *get(LLVMContext& C) { return Type::getPPC_FP128Ty(C); } 223 }; 224 template<bool cross> class TypeBuilder<types::x86_mmx, cross> { 225 public: 226 static Type *get(LLVMContext& C) { return Type::getX86_MMXTy(C); } 227 }; 228 229 template<bool cross> class TypeBuilder<void, cross> { 230 public: 231 static Type *get(LLVMContext &C) { 232 return Type::getVoidTy(C); 233 } 234 }; 235 236 /// void* is disallowed in LLVM types, but it occurs often enough in C code that 237 /// we special case it. 238 template<> class TypeBuilder<void*, false> 239 : public TypeBuilder<types::i<8>*, false> {}; 240 template<> class TypeBuilder<const void*, false> 241 : public TypeBuilder<types::i<8>*, false> {}; 242 template<> class TypeBuilder<volatile void*, false> 243 : public TypeBuilder<types::i<8>*, false> {}; 244 template<> class TypeBuilder<const volatile void*, false> 245 : public TypeBuilder<types::i<8>*, false> {}; 246 247 template<typename R, bool cross> class TypeBuilder<R(), cross> { 248 public: 249 static FunctionType *get(LLVMContext &Context) { 250 return FunctionType::get(TypeBuilder<R, cross>::get(Context), false); 251 } 252 }; 253 template<typename R, typename A1, bool cross> class TypeBuilder<R(A1), cross> { 254 public: 255 static FunctionType *get(LLVMContext &Context) { 256 Type *params[] = { 257 TypeBuilder<A1, cross>::get(Context), 258 }; 259 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 260 params, false); 261 } 262 }; 263 template<typename R, typename A1, typename A2, bool cross> 264 class TypeBuilder<R(A1, A2), cross> { 265 public: 266 static FunctionType *get(LLVMContext &Context) { 267 Type *params[] = { 268 TypeBuilder<A1, cross>::get(Context), 269 TypeBuilder<A2, cross>::get(Context), 270 }; 271 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 272 params, false); 273 } 274 }; 275 template<typename R, typename A1, typename A2, typename A3, bool cross> 276 class TypeBuilder<R(A1, A2, A3), cross> { 277 public: 278 static FunctionType *get(LLVMContext &Context) { 279 Type *params[] = { 280 TypeBuilder<A1, cross>::get(Context), 281 TypeBuilder<A2, cross>::get(Context), 282 TypeBuilder<A3, cross>::get(Context), 283 }; 284 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 285 params, false); 286 } 287 }; 288 289 template<typename R, typename A1, typename A2, typename A3, typename A4, 290 bool cross> 291 class TypeBuilder<R(A1, A2, A3, A4), cross> { 292 public: 293 static FunctionType *get(LLVMContext &Context) { 294 Type *params[] = { 295 TypeBuilder<A1, cross>::get(Context), 296 TypeBuilder<A2, cross>::get(Context), 297 TypeBuilder<A3, cross>::get(Context), 298 TypeBuilder<A4, cross>::get(Context), 299 }; 300 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 301 params, false); 302 } 303 }; 304 305 template<typename R, typename A1, typename A2, typename A3, typename A4, 306 typename A5, bool cross> 307 class TypeBuilder<R(A1, A2, A3, A4, A5), cross> { 308 public: 309 static FunctionType *get(LLVMContext &Context) { 310 Type *params[] = { 311 TypeBuilder<A1, cross>::get(Context), 312 TypeBuilder<A2, cross>::get(Context), 313 TypeBuilder<A3, cross>::get(Context), 314 TypeBuilder<A4, cross>::get(Context), 315 TypeBuilder<A5, cross>::get(Context), 316 }; 317 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 318 params, false); 319 } 320 }; 321 322 template<typename R, bool cross> class TypeBuilder<R(...), cross> { 323 public: 324 static FunctionType *get(LLVMContext &Context) { 325 return FunctionType::get(TypeBuilder<R, cross>::get(Context), true); 326 } 327 }; 328 template<typename R, typename A1, bool cross> 329 class TypeBuilder<R(A1, ...), cross> { 330 public: 331 static FunctionType *get(LLVMContext &Context) { 332 Type *params[] = { 333 TypeBuilder<A1, cross>::get(Context), 334 }; 335 return FunctionType::get(TypeBuilder<R, cross>::get(Context), params, true); 336 } 337 }; 338 template<typename R, typename A1, typename A2, bool cross> 339 class TypeBuilder<R(A1, A2, ...), cross> { 340 public: 341 static FunctionType *get(LLVMContext &Context) { 342 Type *params[] = { 343 TypeBuilder<A1, cross>::get(Context), 344 TypeBuilder<A2, cross>::get(Context), 345 }; 346 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 347 params, true); 348 } 349 }; 350 template<typename R, typename A1, typename A2, typename A3, bool cross> 351 class TypeBuilder<R(A1, A2, A3, ...), cross> { 352 public: 353 static FunctionType *get(LLVMContext &Context) { 354 Type *params[] = { 355 TypeBuilder<A1, cross>::get(Context), 356 TypeBuilder<A2, cross>::get(Context), 357 TypeBuilder<A3, cross>::get(Context), 358 }; 359 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 360 params, true); 361 } 362 }; 363 364 template<typename R, typename A1, typename A2, typename A3, typename A4, 365 bool cross> 366 class TypeBuilder<R(A1, A2, A3, A4, ...), cross> { 367 public: 368 static FunctionType *get(LLVMContext &Context) { 369 Type *params[] = { 370 TypeBuilder<A1, cross>::get(Context), 371 TypeBuilder<A2, cross>::get(Context), 372 TypeBuilder<A3, cross>::get(Context), 373 TypeBuilder<A4, cross>::get(Context), 374 }; 375 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 376 params, true); 377 } 378 }; 379 380 template<typename R, typename A1, typename A2, typename A3, typename A4, 381 typename A5, bool cross> 382 class TypeBuilder<R(A1, A2, A3, A4, A5, ...), cross> { 383 public: 384 static FunctionType *get(LLVMContext &Context) { 385 Type *params[] = { 386 TypeBuilder<A1, cross>::get(Context), 387 TypeBuilder<A2, cross>::get(Context), 388 TypeBuilder<A3, cross>::get(Context), 389 TypeBuilder<A4, cross>::get(Context), 390 TypeBuilder<A5, cross>::get(Context), 391 }; 392 return FunctionType::get(TypeBuilder<R, cross>::get(Context), 393 params, true); 394 } 395 }; 396 397 } // namespace llvm 398 399 #endif 400
