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Clang exposes an interface for extending the PCM/PCH file format: `ModuleFileExtension`. Clang itself has only a single implementation of the interface: `TestModuleFileExtension` that can be instantiated via the `-ftest-module-file_extension=` command line argument (and is stored in `FrontendOptions::ModuleFileExtensions`). Clients of the Clang library can extend the PCM/PCH file format by pushing an instance of their extension class to the `FrontendOptions::ModuleFileExtensions` vector. When generating the `-ftest-module-file_extension=` command line argument from `FrontendOptions`, a downcast is used to distinguish between the Clang's testing extension and other (client) extensions. This functionality is enabled by LLVM-style RTTI. However, this style of RTTI is hard to extend, as it requires patching Clang (adding new case to the `ModuleFileExtensionKind` enum). This patch switches to the LLVM RTTI for open class hierarchies, which allows libClang users (e.g. Swift) to create implementations of `ModuleFileExtension` without patching Clang. (Documentation of the feature: https://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html#rtti-for-open-class-hierarchies) Reviewed By: artemcm Differential Revision: https://reviews.llvm.org/D97702
23 lines
780 B
C++
23 lines
780 B
C++
//===-- ModuleFileExtension.cpp - Module File Extensions ------------------===//
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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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#include "clang/Serialization/ModuleFileExtension.h"
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#include "llvm/ADT/Hashing.h"
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using namespace clang;
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char ModuleFileExtension::ID = 0;
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ModuleFileExtension::~ModuleFileExtension() { }
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llvm::hash_code ModuleFileExtension::hashExtension(llvm::hash_code Code) const {
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return Code;
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}
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ModuleFileExtensionWriter::~ModuleFileExtensionWriter() { }
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ModuleFileExtensionReader::~ModuleFileExtensionReader() { }
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