72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
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//===- HashTable.cpp - PDB Hash Table -------------------------------------===//
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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 "llvm/DebugInfo/PDB/Native/HashTable.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/DebugInfo/PDB/Native/RawError.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/BinaryStreamWriter.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MathExtras.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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#include <utility>
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using namespace llvm;
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using namespace llvm::pdb;
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Error llvm::pdb::readSparseBitVector(BinaryStreamReader &Stream,
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SparseBitVector<> &V) {
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uint32_t NumWords;
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if (auto EC = Stream.readInteger(NumWords))
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return joinErrors(
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std::move(EC),
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make_error<RawError>(raw_error_code::corrupt_file,
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"Expected hash table number of words"));
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for (uint32_t I = 0; I != NumWords; ++I) {
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uint32_t Word;
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if (auto EC = Stream.readInteger(Word))
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return joinErrors(std::move(EC),
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make_error<RawError>(raw_error_code::corrupt_file,
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"Expected hash table word"));
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for (unsigned Idx = 0; Idx < 32; ++Idx)
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if (Word & (1U << Idx))
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V.set((I * 32) + Idx);
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}
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return Error::success();
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}
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Error llvm::pdb::writeSparseBitVector(BinaryStreamWriter &Writer,
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SparseBitVector<> &Vec) {
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constexpr int BitsPerWord = 8 * sizeof(uint32_t);
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int ReqBits = Vec.find_last() + 1;
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uint32_t ReqWords = alignTo(ReqBits, BitsPerWord) / BitsPerWord;
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if (auto EC = Writer.writeInteger(ReqWords))
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return joinErrors(
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std::move(EC),
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make_error<RawError>(raw_error_code::corrupt_file,
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"Could not write linear map number of words"));
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uint32_t Idx = 0;
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for (uint32_t I = 0; I != ReqWords; ++I) {
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uint32_t Word = 0;
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for (uint32_t WordIdx = 0; WordIdx < 32; ++WordIdx, ++Idx) {
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if (Vec.test(Idx))
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Word |= (1 << WordIdx);
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}
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if (auto EC = Writer.writeInteger(Word))
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return joinErrors(std::move(EC), make_error<RawError>(
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raw_error_code::corrupt_file,
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"Could not write linear map word"));
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}
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return Error::success();
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}
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