1 //===- HashTable.cpp - PDB Hash Table -------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "llvm/DebugInfo/PDB/Native/HashTable.h"
10 #include "llvm/DebugInfo/PDB/Native/RawError.h"
11 #include "llvm/Support/BinaryStreamReader.h"
12 #include "llvm/Support/BinaryStreamWriter.h"
13 #include "llvm/Support/Error.h"
14 #include "llvm/Support/MathExtras.h"
15 #include <cstdint>
16 #include <utility>
17
18 using namespace llvm;
19 using namespace llvm::pdb;
20
readSparseBitVector(BinaryStreamReader & Stream,SparseBitVector<> & V)21 Error llvm::pdb::readSparseBitVector(BinaryStreamReader &Stream,
22 SparseBitVector<> &V) {
23 uint32_t NumWords;
24 if (auto EC = Stream.readInteger(NumWords))
25 return joinErrors(
26 std::move(EC),
27 make_error<RawError>(raw_error_code::corrupt_file,
28 "Expected hash table number of words"));
29
30 for (uint32_t I = 0; I != NumWords; ++I) {
31 uint32_t Word;
32 if (auto EC = Stream.readInteger(Word))
33 return joinErrors(std::move(EC),
34 make_error<RawError>(raw_error_code::corrupt_file,
35 "Expected hash table word"));
36 for (unsigned Idx = 0; Idx < 32; ++Idx)
37 if (Word & (1U << Idx))
38 V.set((I * 32) + Idx);
39 }
40 return Error::success();
41 }
42
writeSparseBitVector(BinaryStreamWriter & Writer,SparseBitVector<> & Vec)43 Error llvm::pdb::writeSparseBitVector(BinaryStreamWriter &Writer,
44 SparseBitVector<> &Vec) {
45 constexpr int BitsPerWord = 8 * sizeof(uint32_t);
46
47 int ReqBits = Vec.find_last() + 1;
48 uint32_t ReqWords = alignTo(ReqBits, BitsPerWord) / BitsPerWord;
49 if (auto EC = Writer.writeInteger(ReqWords))
50 return joinErrors(
51 std::move(EC),
52 make_error<RawError>(raw_error_code::corrupt_file,
53 "Could not write linear map number of words"));
54
55 uint32_t Idx = 0;
56 for (uint32_t I = 0; I != ReqWords; ++I) {
57 uint32_t Word = 0;
58 for (uint32_t WordIdx = 0; WordIdx < 32; ++WordIdx, ++Idx) {
59 if (Vec.test(Idx))
60 Word |= (1 << WordIdx);
61 }
62 if (auto EC = Writer.writeInteger(Word))
63 return joinErrors(std::move(EC), make_error<RawError>(
64 raw_error_code::corrupt_file,
65 "Could not write linear map word"));
66 }
67 return Error::success();
68 }
69