================ @@ -0,0 +1,2001 @@ +//===--- APINotesReader.cpp - API Notes Reader ------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "clang/APINotes/APINotesReader.h" +#include "APINotesFormat.h" +#include "llvm/ADT/Hashing.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/Bitstream/BitstreamReader.h" +#include "llvm/Support/DJB.h" +#include "llvm/Support/EndianStream.h" +#include "llvm/Support/OnDiskHashTable.h" + +namespace clang { +namespace api_notes { +using namespace llvm::support; + +namespace { +/// Deserialize a version tuple. +llvm::VersionTuple ReadVersionTuple(const uint8_t *&Data) { + uint8_t NumVersions = (*Data++) & 0x03; + + unsigned Major = endian::readNext<uint32_t, little, unaligned>(Data); + if (NumVersions == 0) + return llvm::VersionTuple(Major); + + unsigned Minor = endian::readNext<uint32_t, little, unaligned>(Data); + if (NumVersions == 1) + return llvm::VersionTuple(Major, Minor); + + unsigned Subminor = endian::readNext<uint32_t, little, unaligned>(Data); + if (NumVersions == 2) + return llvm::VersionTuple(Major, Minor, Subminor); + + unsigned Build = endian::readNext<uint32_t, little, unaligned>(Data); + return llvm::VersionTuple(Major, Minor, Subminor, Build); +} + +/// An on-disk hash table whose data is versioned based on the Swift version. +template <typename Derived, typename KeyType, typename UnversionedDataType> +class VersionedTableInfo { +public: + using internal_key_type = KeyType; + using external_key_type = KeyType; + using data_type = + llvm::SmallVector<std::pair<llvm::VersionTuple, UnversionedDataType>, 1>; + using hash_value_type = size_t; + using offset_type = unsigned; + + internal_key_type GetInternalKey(external_key_type Key) { return Key; } + + external_key_type GetExternalKey(internal_key_type Key) { return Key; } + + static bool EqualKey(internal_key_type LHS, internal_key_type RHS) { + return LHS == RHS; + } + + static std::pair<unsigned, unsigned> ReadKeyDataLength(const uint8_t *&Data) { + unsigned KeyLength = endian::readNext<uint16_t, little, unaligned>(Data); + unsigned DataLength = endian::readNext<uint16_t, little, unaligned>(Data); + return {KeyLength, DataLength}; + } + + static data_type ReadData(internal_key_type Key, const uint8_t *Data, + unsigned Length) { + unsigned NumElements = endian::readNext<uint16_t, little, unaligned>(Data); + data_type Result; + Result.reserve(NumElements); + for (unsigned i = 0; i != NumElements; ++i) { + auto version = ReadVersionTuple(Data); + const auto *DataBefore = Data; + (void)DataBefore; + auto UnversionedData = Derived::readUnversioned(Key, Data); ---------------- egorzhdan wrote:
Done https://github.com/llvm/llvm-project/pull/66769 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
