LLVM  10.0.0svn
NativeEnumInjectedSources.cpp
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1 //==- NativeEnumInjectedSources.cpp - Native Injected Source Enumerator --*-==//
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 
10 
14 
15 namespace llvm {
16 namespace pdb {
17 
18 namespace {
19 
20 Expected<std::string> readStreamData(BinaryStream &Stream, uint32_t Limit) {
21  uint32_t Offset = 0, DataLength = std::min(Limit, Stream.getLength());
22  std::string Result;
23  Result.reserve(DataLength);
24  while (Offset < DataLength) {
25  ArrayRef<uint8_t> Data;
26  if (auto E = Stream.readLongestContiguousChunk(Offset, Data))
27  return std::move(E);
28  Data = Data.take_front(DataLength - Offset);
29  Offset += Data.size();
30  Result += toStringRef(Data);
31  }
32  return Result;
33 }
34 
35 class NativeInjectedSource final : public IPDBInjectedSource {
36  const SrcHeaderBlockEntry &Entry;
37  const PDBStringTable &Strings;
38  PDBFile &File;
39 
40 public:
41  NativeInjectedSource(const SrcHeaderBlockEntry &Entry,
42  PDBFile &File, const PDBStringTable &Strings)
43  : Entry(Entry), Strings(Strings), File(File) {}
44 
45  uint32_t getCrc32() const override { return Entry.CRC; }
46  uint64_t getCodeByteSize() const override { return Entry.FileSize; }
47 
48  std::string getFileName() const override {
49  auto Name = Strings.getStringForID(Entry.FileNI);
50  assert(Name && "InjectedSourceStream should have rejected this");
51  return *Name;
52  }
53 
54  std::string getObjectFileName() const override {
55  auto ObjName = Strings.getStringForID(Entry.ObjNI);
56  assert(ObjName && "InjectedSourceStream should have rejected this");
57  return *ObjName;
58  }
59 
60  std::string getVirtualFileName() const override {
61  auto VName = Strings.getStringForID(Entry.VFileNI);
62  assert(VName && "InjectedSourceStream should have rejected this");
63  return *VName;
64  }
65 
66  uint32_t getCompression() const override { return Entry.Compression; }
67 
68  std::string getCode() const override {
69  // Get name of stream storing the data.
70  auto VName = Strings.getStringForID(Entry.VFileNI);
71  assert(VName && "InjectedSourceStream should have rejected this");
72  std::string StreamName = ("/src/files/" + *VName).str();
73 
74  // Find stream with that name and read its data.
75  // FIXME: Consider validating (or even loading) all this in
76  // InjectedSourceStream so that no error can happen here.
77  auto ExpectedFileStream = File.safelyCreateNamedStream(StreamName);
78  if (!ExpectedFileStream) {
79  consumeError(ExpectedFileStream.takeError());
80  return "(failed to open data stream)";
81  }
82 
83  auto Data = readStreamData(**ExpectedFileStream, Entry.FileSize);
84  if (!Data) {
85  consumeError(Data.takeError());
86  return "(failed to read data)";
87  }
88  return *Data;
89  }
90 };
91 
92 } // namespace
93 
95  PDBFile &File, const InjectedSourceStream &IJS,
96  const PDBStringTable &Strings)
97  : File(File), Stream(IJS), Strings(Strings), Cur(Stream.begin()) {}
98 
100  return static_cast<uint32_t>(Stream.size());
101 }
102 
103 std::unique_ptr<IPDBInjectedSource>
105  if (N >= getChildCount())
106  return nullptr;
107  return std::make_unique<NativeInjectedSource>(std::next(Stream.begin(), N)->second,
108  File, Strings);
109 }
110 
111 std::unique_ptr<IPDBInjectedSource> NativeEnumInjectedSources::getNext() {
112  if (Cur == Stream.end())
113  return nullptr;
114  return std::make_unique<NativeInjectedSource>((Cur++)->second, File, Strings);
115 }
116 
117 void NativeEnumInjectedSources::reset() { Cur = Stream.begin(); }
118 
119 }
120 }
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Consume a Error without doing anything.
Definition: Error.h:981
NativeEnumInjectedSources(PDBFile &File, const InjectedSourceStream &IJS, const PDBStringTable &Strings)
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