855ec517a3
Numerous MLIR functions return instances of `StringRef` to refer to a non-owning fragment of a string (usually owned by the context). This is a relatively simple class that is defined in LLVM. Provide a simple wrapper in the MLIR C API that contains the pointer and length of the string fragment and use it for Standard attribute functions that return StringRef instead of the previous, callback-based mechanism. Reviewed By: stellaraccident Differential Revision: https://reviews.llvm.org/D87677
58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/*===-- mlir-c/Support.h - Helpers for C API to Core MLIR ---------*- C -*-===*\
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|* *|
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM *|
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|* 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 header declares the auxiliary data structures used in C APIs to core *|
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|* MLIR functionality. *|
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|* *|
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\*===----------------------------------------------------------------------===*/
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#ifndef MLIR_C_SUPPORT_H
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#define MLIR_C_SUPPORT_H
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#include <stddef.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*============================================================================*/
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/* MlirStringRef. */
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/*============================================================================*/
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/** A pointer to a sized fragment of a string, not necessarily null-terminated.
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* Does not own the underlying string. This is equivalent to llvm::StringRef.
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*/
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struct MlirStringRef {
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const char *data; /**< Pointer to the first symbol. */
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size_t length; /**< Length of the fragment. */
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};
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typedef struct MlirStringRef MlirStringRef;
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/** Constructs a string reference from the pointer and length. The pointer need
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* not reference to a null-terminated string.
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*/
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inline MlirStringRef mlirStringRefCreate(const char *str, size_t length) {
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MlirStringRef result;
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result.data = str;
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result.length = length;
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return result;
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}
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/** Constructs a string reference from a null-terminated C string. Prefer
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* mlirStringRefCreate if the length of the string is known.
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*/
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MlirStringRef mlirStringRefCreateFromCString(const char *str);
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#ifdef __cplusplus
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}
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#endif
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#endif // MLIR_C_SUPPORT_H
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