| 1 | //===- Wrap.h - C API Utilities ---------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file contains common definitions for wrapping opaque C++ pointers into |
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| 10 | // C structures for the purpose of C API. This file should not be included from |
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| 11 | // C++ code other than C API implementation nor from C code. |
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| 12 | // |
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| 13 | //===----------------------------------------------------------------------===// |
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| 14 | |
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| 15 | #ifndef MLIR_CAPI_WRAP_H |
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| 16 | #define MLIR_CAPI_WRAP_H |
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| 17 | |
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| 18 | #include "mlir-c/IR.h" |
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| 19 | #include "mlir/Support/LLVM.h" |
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| 20 | |
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| 21 | //===----------------------------------------------------------------------===// |
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| 22 | // Definitions of methods for non-owning structures used in C API. |
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| 23 | //===----------------------------------------------------------------------===// |
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| 24 | |
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| 25 | #define DEFINE_C_API_PTR_METHODS(name, cpptype) \ |
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| 26 | static inline name wrap(cpptype *cpp) { return name{cpp}; } \ |
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| 27 | static inline cpptype *unwrap(name c) { \ |
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| 28 | return static_cast<cpptype *>(c.ptr); \ |
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| 29 | } |
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| 30 | |
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| 31 | #define DEFINE_C_API_METHODS(name, cpptype) \ |
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| 32 | static inline name wrap(cpptype cpp) { \ |
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| 33 | return name{cpp.getAsOpaquePointer()}; \ |
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| 34 | } \ |
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| 35 | static inline cpptype unwrap(name c) { \ |
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| 36 | return cpptype::getFromOpaquePointer(c.ptr); \ |
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| 37 | } |
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| 38 | |
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| 39 | template <typename CppTy, typename CTy> |
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| 40 | static llvm::ArrayRef<CppTy> unwrapList(size_t size, CTy *first, |
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| 41 | llvm::SmallVectorImpl<CppTy> &storage) { |
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| 42 | static_assert( |
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| 43 | std::is_same<decltype(unwrap(std::declval<CTy>())), CppTy>::value, |
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| 44 | "incompatible C and C++ types" ); |
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| 45 | |
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| 46 | if (size == 0) |
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| 47 | return std::nullopt; |
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| 48 | |
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| 49 | assert(storage.empty() && "expected to populate storage" ); |
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| 50 | storage.reserve(size); |
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| 51 | for (size_t i = 0; i < size; ++i) |
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| 52 | storage.push_back(unwrap(*(first + i))); |
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| 53 | return storage; |
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| 54 | } |
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| 55 | |
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| 56 | #endif // MLIR_CAPI_WRAP_H |
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| 57 | |
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