1 | //===- Utils.h - C API General Utilities ------------------------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file defines general utilities for C API. This file should not be |
10 | // included from C++ code other than C API implementation nor from C code. |
11 | // |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | #ifndef MLIR_CAPI_UTILS_H |
15 | #define MLIR_CAPI_UTILS_H |
16 | |
17 | #include <utility> |
18 | |
19 | #include "mlir-c/Support.h" |
20 | #include "llvm/Support/raw_ostream.h" |
21 | |
22 | //===----------------------------------------------------------------------===// |
23 | // Printing helper. |
24 | //===----------------------------------------------------------------------===// |
25 | |
26 | namespace mlir { |
27 | namespace detail { |
28 | /// A simple raw ostream subclass that forwards write_impl calls to the |
29 | /// user-supplied callback together with opaque user-supplied data. |
30 | class CallbackOstream : public llvm::raw_ostream { |
31 | public: |
32 | CallbackOstream(std::function<void(MlirStringRef, void *)> callback, |
33 | void *opaqueData) |
34 | : raw_ostream(/*unbuffered=*/true), callback(std::move(callback)), |
35 | opaqueData(opaqueData), pos(0u) {} |
36 | |
37 | void write_impl(const char *ptr, size_t size) override { |
38 | MlirStringRef string = mlirStringRefCreate(str: ptr, length: size); |
39 | callback(string, opaqueData); |
40 | pos += size; |
41 | } |
42 | |
43 | uint64_t current_pos() const override { return pos; } |
44 | |
45 | private: |
46 | std::function<void(MlirStringRef, void *)> callback; |
47 | void *opaqueData; |
48 | uint64_t pos; |
49 | }; |
50 | } // namespace detail |
51 | } // namespace mlir |
52 | |
53 | #endif // MLIR_CAPI_UTILS_H |
54 | |