1 //===- HashTable.cpp - PDB Hash Table -------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/DebugInfo/PDB/Native/HashTable.h"
11 #include "llvm/ADT/Optional.h"
12 #include "llvm/DebugInfo/PDB/Native/RawError.h"
13 #include "llvm/Support/BinaryStreamReader.h"
14 #include "llvm/Support/BinaryStreamWriter.h"
15 #include "llvm/Support/Error.h"
16 #include "llvm/Support/MathExtras.h"
17 #include <algorithm>
18 #include <cassert>
19 #include <cstdint>
20 #include <utility>
21
22 using namespace llvm;
23 using namespace llvm::pdb;
24
readSparseBitVector(BinaryStreamReader & Stream,SparseBitVector<> & V)25 Error llvm::pdb::readSparseBitVector(BinaryStreamReader &Stream,
26 SparseBitVector<> &V) {
27 uint32_t NumWords;
28 if (auto EC = Stream.readInteger(NumWords))
29 return joinErrors(
30 std::move(EC),
31 make_error<RawError>(raw_error_code::corrupt_file,
32 "Expected hash table number of words"));
33
34 for (uint32_t I = 0; I != NumWords; ++I) {
35 uint32_t Word;
36 if (auto EC = Stream.readInteger(Word))
37 return joinErrors(std::move(EC),
38 make_error<RawError>(raw_error_code::corrupt_file,
39 "Expected hash table word"));
40 for (unsigned Idx = 0; Idx < 32; ++Idx)
41 if (Word & (1U << Idx))
42 V.set((I * 32) + Idx);
43 }
44 return Error::success();
45 }
46
writeSparseBitVector(BinaryStreamWriter & Writer,SparseBitVector<> & Vec)47 Error llvm::pdb::writeSparseBitVector(BinaryStreamWriter &Writer,
48 SparseBitVector<> &Vec) {
49 constexpr int BitsPerWord = 8 * sizeof(uint32_t);
50
51 int ReqBits = Vec.find_last() + 1;
52 uint32_t ReqWords = alignTo(ReqBits, BitsPerWord) / BitsPerWord;
53 if (auto EC = Writer.writeInteger(ReqWords))
54 return joinErrors(
55 std::move(EC),
56 make_error<RawError>(raw_error_code::corrupt_file,
57 "Could not write linear map number of words"));
58
59 uint32_t Idx = 0;
60 for (uint32_t I = 0; I != ReqWords; ++I) {
61 uint32_t Word = 0;
62 for (uint32_t WordIdx = 0; WordIdx < 32; ++WordIdx, ++Idx) {
63 if (Vec.test(Idx))
64 Word |= (1 << WordIdx);
65 }
66 if (auto EC = Writer.writeInteger(Word))
67 return joinErrors(std::move(EC), make_error<RawError>(
68 raw_error_code::corrupt_file,
69 "Could not write linear map word"));
70 }
71 return Error::success();
72 }
73