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76 lines
2.7 KiB
76 lines
2.7 KiB
4 months ago
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//===-- BitcodeReader.h - ClangDoc Bitcode Reader --------------*- 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 implements a reader for parsing the clang-doc internal
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// representation from LLVM bitcode. The reader takes in a stream of bits and
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// generates the set of infos that it represents.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_BITCODEREADER_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_BITCODEREADER_H
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#include "BitcodeWriter.h"
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#include "Representation.h"
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#include "clang/AST/AST.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Bitstream/BitstreamReader.h"
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#include "llvm/Support/Error.h"
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namespace clang {
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namespace doc {
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// Class to read bitstream into an InfoSet collection
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class ClangDocBitcodeReader {
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public:
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ClangDocBitcodeReader(llvm::BitstreamCursor &Stream) : Stream(Stream) {}
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// Main entry point, calls readBlock to read each block in the given stream.
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llvm::Expected<std::vector<std::unique_ptr<Info>>> readBitcode();
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private:
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enum class Cursor { BadBlock = 1, Record, BlockEnd, BlockBegin };
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// Top level parsing
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llvm::Error validateStream();
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llvm::Error readVersion();
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llvm::Error readBlockInfoBlock();
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// Read a block of records into a single Info struct, calls readRecord on each
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// record found.
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template <typename T> llvm::Error readBlock(unsigned ID, T I);
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// Step through a block of records to find the next data field.
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template <typename T> llvm::Error readSubBlock(unsigned ID, T I);
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// Read record data into the given Info data field, calling the appropriate
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// parseRecord functions to parse and store the data.
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template <typename T> llvm::Error readRecord(unsigned ID, T I);
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// Allocate the relevant type of info and add read data to the object.
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template <typename T>
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llvm::Expected<std::unique_ptr<Info>> createInfo(unsigned ID);
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// Helper function to step through blocks to find and dispatch the next record
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// or block to be read.
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Cursor skipUntilRecordOrBlock(unsigned &BlockOrRecordID);
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// Helper function to set up the appropriate type of Info.
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llvm::Expected<std::unique_ptr<Info>> readBlockToInfo(unsigned ID);
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llvm::BitstreamCursor &Stream;
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Optional<llvm::BitstreamBlockInfo> BlockInfo;
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FieldId CurrentReferenceField;
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};
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} // namespace doc
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} // namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_BITCODEREADER_H
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