0580563299
## Purpose This patch is one in a series of code-mods that annotate LLVM’s public interface for export. This patch annotates the `llvm-c` interface with a new `LLVM_C_ABI` annotation, which behaves like the `LLVM_ABI`. This annotation currently has no meaningful impact on the LLVM build; however, it is a prerequisite to support an LLVM Windows DLL (shared library) build. ## Overview 1. Add a new `llvm-c/Visibility.h` header file that defines a new `LLVM_C_ABI` macro. The macro resolves to the proper DLL export/import annotation on Windows and a "default" visibility annotation elsewhere. 2. Add a new `LLVM_ENABLE_LLVM_C_EXPORT_ANNOTATIONS` `#cmakedefine` that is used to gate the definition of `LLVM_C_ABI`. 3. Remove the existing `LLVM_C_ABI` definition from `llvm/Support/Compiler.h`. Update the small number of `LLVM_C_ABI` references to get it from the new `llvm-c/Visibility.h` header. 4. Code-mod annotate the public `llvm-c` interface using the [Interface Definition Scanner (IDS)](https://github.com/compnerd/ids) tool. 5. Format the changes with `clang-format`. ## Background This effort is tracked in #109483. Additional context is provided in [this discourse](https://discourse.llvm.org/t/psa-annotating-llvm-public-interface/85307), and documentation for `LLVM_ABI` and related annotations is found in the LLVM repo [here](https://github.com/llvm/llvm-project/blob/main/llvm/docs/InterfaceExportAnnotations.rst). ## Validation Local builds and tests to validate cross-platform compatibility. This included llvm, clang, and lldb on the following configurations: - Windows with MSVC - Windows with Clang - Linux with GCC - Linux with Clang - Darwin with Clang
58 lines
2.4 KiB
C++
58 lines
2.4 KiB
C++
/*===-- llvm-c/BitWriter.h - BitWriter Library C Interface ------*- 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 C interface to libLLVMBitWriter.a, which *|
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|* implements output of the LLVM bitcode format. *|
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|* *|
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|* Many exotic languages can interoperate with C code but have a harder time *|
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|* with C++ due to name mangling. So in addition to C, this interface enables *|
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|* tools written in such languages. *|
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|* *|
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\*===----------------------------------------------------------------------===*/
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#ifndef LLVM_C_BITWRITER_H
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#define LLVM_C_BITWRITER_H
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#include "llvm-c/ExternC.h"
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#include "llvm-c/Types.h"
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#include "llvm-c/Visibility.h"
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LLVM_C_EXTERN_C_BEGIN
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/**
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* @defgroup LLVMCBitWriter Bit Writer
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* @ingroup LLVMC
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*
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* @{
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*/
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/*===-- Operations on modules ---------------------------------------------===*/
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/** Writes a module to the specified path. Returns 0 on success. */
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LLVM_C_ABI int LLVMWriteBitcodeToFile(LLVMModuleRef M, const char *Path);
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/** Writes a module to an open file descriptor. Returns 0 on success. */
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LLVM_C_ABI int LLVMWriteBitcodeToFD(LLVMModuleRef M, int FD, int ShouldClose,
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int Unbuffered);
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/** Deprecated for LLVMWriteBitcodeToFD. Writes a module to an open file
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descriptor. Returns 0 on success. Closes the Handle. */
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LLVM_C_ABI int LLVMWriteBitcodeToFileHandle(LLVMModuleRef M, int Handle);
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/** Writes a module to a new memory buffer and returns it. */
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LLVM_C_ABI LLVMMemoryBufferRef LLVMWriteBitcodeToMemoryBuffer(LLVMModuleRef M);
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/**
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* @}
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*/
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LLVM_C_EXTERN_C_END
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#endif
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