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//===---- llvm/TypeBuilder.h - Builder for LLVM types -----------*- C++ -*-===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file defines the TypeBuilder class, which is used as a convenient way to
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// create LLVM types with a consistent and simplified interface.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_TYPEBUILDER_H
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#define LLVM_IR_TYPEBUILDER_H
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/LLVMContext.h"
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/// TypeBuilder - This provides a uniform API for looking up types
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/// known at compile time. To support cross-compilation, we define a
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/// series of tag types in the llvm::types namespace, like i<N>,
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/// ieee_float, ppc_fp128, etc. TypeBuilder<T, false> allows T to be
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/// any of these, a native C type (whose size may depend on the host
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/// compiler), or a pointer, function, or struct type built out of
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/// these. TypeBuilder<T, true> removes native C types from this set
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/// to guarantee that its result is suitable for cross-compilation.
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/// We define the primitive types, pointer types, and functions up to
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/// 5 arguments here, but to use this class with your own types,
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/// you'll need to specialize it. For example, say you want to call a
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/// function defined externally as:
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/// void *array[1]; // Intended as a flexible array.
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/// int8 AFunction(struct MyType *value);
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/// You'll want to use
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/// Function::Create(TypeBuilder<types::i<8>(MyType*), true>::get(), ...)
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/// to declare the function, but when you first try this, your compiler will
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/// complain that TypeBuilder<MyType, true>::get() doesn't exist. To fix this,
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/// template<bool xcompile> class TypeBuilder<MyType, xcompile> {
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/// static StructType *get(LLVMContext &Context) {
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/// // If you cache this result, be sure to cache it separately
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/// // for each LLVMContext.
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/// return StructType::get(
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/// TypeBuilder<types::i<32>, xcompile>::get(Context),
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/// TypeBuilder<types::i<32>*, xcompile>::get(Context),
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/// TypeBuilder<types::i<8>*[], xcompile>::get(Context),
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/// // You may find this a convenient place to put some constants
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/// // to help with getelementptr. They don't have any effect on
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/// // the operation of TypeBuilder.
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/// } // namespace llvm
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/// TypeBuilder cannot handle recursive types or types you only know at runtime.
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/// If you try to give it a recursive type, it will deadlock, infinitely
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/// recurse, or do something similarly undesirable.
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template<typename T, bool cross_compilable> class TypeBuilder {};
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// Types for use with cross-compilable TypeBuilders. These correspond
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// exactly with an LLVM-native type.
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/// i<N> corresponds to the LLVM IntegerType with N bits.
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template<uint32_t num_bits> class i {};
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// The following classes represent the LLVM floating types.
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// LLVM doesn't have const or volatile types.
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template<typename T, bool cross> class TypeBuilder<const T, cross>
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: public TypeBuilder<T, cross> {};
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template<typename T, bool cross> class TypeBuilder<volatile T, cross>
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: public TypeBuilder<T, cross> {};
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template<typename T, bool cross> class TypeBuilder<const volatile T, cross>
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: public TypeBuilder<T, cross> {};
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template<typename T, bool cross> class TypeBuilder<T*, cross> {
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static PointerType *get(LLVMContext &Context) {
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return PointerType::getUnqual(TypeBuilder<T,cross>::get(Context));
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/// There is no support for references
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template<typename T, bool cross> class TypeBuilder<T&, cross> {};
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template<typename T, size_t N, bool cross> class TypeBuilder<T[N], cross> {
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static ArrayType *get(LLVMContext &Context) {
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return ArrayType::get(TypeBuilder<T, cross>::get(Context), N);
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/// LLVM uses an array of length 0 to represent an unknown-length array.
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template<typename T, bool cross> class TypeBuilder<T[], cross> {
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static ArrayType *get(LLVMContext &Context) {
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return ArrayType::get(TypeBuilder<T, cross>::get(Context), 0);
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// Define the C integral types only for TypeBuilder<T, false>.
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// C integral types do not have a defined size. It would be nice to use the
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// stdint.h-defined typedefs that do have defined sizes, but we'd run into the
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// following problem:
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// On an ILP32 machine, stdint.h might define:
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// typedef int int32_t;
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// typedef long long int64_t;
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// typedef long size_t;
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// If we defined TypeBuilder<int32_t> and TypeBuilder<int64_t>, then any use of
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// TypeBuilder<size_t> would fail. We couldn't define TypeBuilder<size_t> in
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// addition to the defined-size types because we'd get duplicate definitions on
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// platforms where stdint.h instead defines:
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// typedef int int32_t;
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// typedef long long int64_t;
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// typedef int size_t;
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// So we define all the primitive C types and nothing else.
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#define DEFINE_INTEGRAL_TYPEBUILDER(T) \
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template<> class TypeBuilder<T, false> { \
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static IntegerType *get(LLVMContext &Context) { \
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return IntegerType::get(Context, sizeof(T) * CHAR_BIT); \
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template<> class TypeBuilder<T, true> { \
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/* We provide a definition here so users don't accidentally */ \
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/* define these types to work. */ \
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DEFINE_INTEGRAL_TYPEBUILDER(char);
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DEFINE_INTEGRAL_TYPEBUILDER(signed char);
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DEFINE_INTEGRAL_TYPEBUILDER(unsigned char);
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DEFINE_INTEGRAL_TYPEBUILDER(short);
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DEFINE_INTEGRAL_TYPEBUILDER(unsigned short);
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DEFINE_INTEGRAL_TYPEBUILDER(int);
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DEFINE_INTEGRAL_TYPEBUILDER(unsigned int);
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DEFINE_INTEGRAL_TYPEBUILDER(long);
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DEFINE_INTEGRAL_TYPEBUILDER(unsigned long);
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DEFINE_INTEGRAL_TYPEBUILDER(__int64);
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DEFINE_INTEGRAL_TYPEBUILDER(unsigned __int64);
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DEFINE_INTEGRAL_TYPEBUILDER(long long);
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DEFINE_INTEGRAL_TYPEBUILDER(unsigned long long);
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#endif /* _MSC_VER */
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#undef DEFINE_INTEGRAL_TYPEBUILDER
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template<uint32_t num_bits, bool cross>
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class TypeBuilder<types::i<num_bits>, cross> {
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static IntegerType *get(LLVMContext &C) {
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return IntegerType::get(C, num_bits);
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template<> class TypeBuilder<float, false> {
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static Type *get(LLVMContext& C) {
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return Type::getFloatTy(C);
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template<> class TypeBuilder<float, true> {};
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template<> class TypeBuilder<double, false> {
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static Type *get(LLVMContext& C) {
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return Type::getDoubleTy(C);
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template<> class TypeBuilder<double, true> {};
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template<bool cross> class TypeBuilder<types::ieee_float, cross> {
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static Type *get(LLVMContext& C) { return Type::getFloatTy(C); }
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template<bool cross> class TypeBuilder<types::ieee_double, cross> {
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static Type *get(LLVMContext& C) { return Type::getDoubleTy(C); }
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template<bool cross> class TypeBuilder<types::x86_fp80, cross> {
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static Type *get(LLVMContext& C) { return Type::getX86_FP80Ty(C); }
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template<bool cross> class TypeBuilder<types::fp128, cross> {
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static Type *get(LLVMContext& C) { return Type::getFP128Ty(C); }
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template<bool cross> class TypeBuilder<types::ppc_fp128, cross> {
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static Type *get(LLVMContext& C) { return Type::getPPC_FP128Ty(C); }
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template<bool cross> class TypeBuilder<types::x86_mmx, cross> {
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static Type *get(LLVMContext& C) { return Type::getX86_MMXTy(C); }
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template<bool cross> class TypeBuilder<void, cross> {
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static Type *get(LLVMContext &C) {
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return Type::getVoidTy(C);
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/// void* is disallowed in LLVM types, but it occurs often enough in C code that
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/// we special case it.
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template<> class TypeBuilder<void*, false>
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: public TypeBuilder<types::i<8>*, false> {};
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template<> class TypeBuilder<const void*, false>
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: public TypeBuilder<types::i<8>*, false> {};
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template<> class TypeBuilder<volatile void*, false>
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: public TypeBuilder<types::i<8>*, false> {};
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template<> class TypeBuilder<const volatile void*, false>
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: public TypeBuilder<types::i<8>*, false> {};
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template<typename R, bool cross> class TypeBuilder<R(), cross> {
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static FunctionType *get(LLVMContext &Context) {
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return FunctionType::get(TypeBuilder<R, cross>::get(Context), false);
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template<typename R, typename A1, bool cross> class TypeBuilder<R(A1), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, bool cross>
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class TypeBuilder<R(A1, A2), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, typename A3, bool cross>
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class TypeBuilder<R(A1, A2, A3), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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TypeBuilder<A3, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, typename A3, typename A4,
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class TypeBuilder<R(A1, A2, A3, A4), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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TypeBuilder<A3, cross>::get(Context),
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TypeBuilder<A4, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, typename A3, typename A4,
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typename A5, bool cross>
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class TypeBuilder<R(A1, A2, A3, A4, A5), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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TypeBuilder<A3, cross>::get(Context),
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TypeBuilder<A4, cross>::get(Context),
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TypeBuilder<A5, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, bool cross> class TypeBuilder<R(...), cross> {
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static FunctionType *get(LLVMContext &Context) {
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return FunctionType::get(TypeBuilder<R, cross>::get(Context), true);
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template<typename R, typename A1, bool cross>
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class TypeBuilder<R(A1, ...), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context), params, true);
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template<typename R, typename A1, typename A2, bool cross>
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class TypeBuilder<R(A1, A2, ...), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, typename A3, bool cross>
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class TypeBuilder<R(A1, A2, A3, ...), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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TypeBuilder<A3, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, typename A3, typename A4,
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class TypeBuilder<R(A1, A2, A3, A4, ...), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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TypeBuilder<A3, cross>::get(Context),
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TypeBuilder<A4, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),
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template<typename R, typename A1, typename A2, typename A3, typename A4,
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typename A5, bool cross>
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class TypeBuilder<R(A1, A2, A3, A4, A5, ...), cross> {
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static FunctionType *get(LLVMContext &Context) {
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TypeBuilder<A1, cross>::get(Context),
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TypeBuilder<A2, cross>::get(Context),
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TypeBuilder<A3, cross>::get(Context),
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TypeBuilder<A4, cross>::get(Context),
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TypeBuilder<A5, cross>::get(Context),
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return FunctionType::get(TypeBuilder<R, cross>::get(Context),