54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
//===- Utils.h - C API General Utilities ------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines general utilities for C API. This file should not be
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// included from C++ code other than C API implementation nor from C code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MLIR_CAPI_UTILS_H
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#define MLIR_CAPI_UTILS_H
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#include <utility>
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#include "mlir-c/Support.h"
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#include "llvm/Support/raw_ostream.h"
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//===----------------------------------------------------------------------===//
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// Printing helper.
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//===----------------------------------------------------------------------===//
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namespace mlir {
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namespace detail {
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/// A simple raw ostream subclass that forwards write_impl calls to the
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/// user-supplied callback together with opaque user-supplied data.
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class CallbackOstream : public llvm::raw_ostream {
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public:
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CallbackOstream(std::function<void(MlirStringRef, void *)> callback,
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void *opaqueData)
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: raw_ostream(/*unbuffered=*/true), callback(std::move(callback)),
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opaqueData(opaqueData), pos(0u) {}
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void write_impl(const char *ptr, size_t size) override {
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MlirStringRef string = mlirStringRefCreate(ptr, size);
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callback(string, opaqueData);
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pos += size;
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}
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uint64_t current_pos() const override { return pos; }
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private:
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std::function<void(MlirStringRef, void *)> callback;
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void *opaqueData;
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uint64_t pos;
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};
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} // namespace detail
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} // namespace mlir
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#endif // MLIR_CAPI_UTILS_H
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