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