[LLVMDebugInfoPDB] - Use cantFail() instead of assert().
[llvm-core.git] / lib / DebugInfo / PDB / Native / NativeEnumInjectedSources.cpp
blob2f6a5bc3d5744aad96649cf487240aefce7fcb54
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 //===----------------------------------------------------------------------===//
9 #include "llvm/DebugInfo/PDB/Native/NativeEnumInjectedSources.h"
11 #include "llvm/DebugInfo/PDB/Native/InfoStream.h"
12 #include "llvm/DebugInfo/PDB/Native/PDBFile.h"
13 #include "llvm/DebugInfo/PDB/Native/PDBStringTable.h"
15 namespace llvm {
16 namespace pdb {
18 namespace {
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);
32 return Result;
35 class NativeInjectedSource final : public IPDBInjectedSource {
36 const SrcHeaderBlockEntry &Entry;
37 const PDBStringTable &Strings;
38 PDBFile &File;
40 public:
41 NativeInjectedSource(const SrcHeaderBlockEntry &Entry,
42 PDBFile &File, const PDBStringTable &Strings)
43 : Entry(Entry), Strings(Strings), File(File) {}
45 uint32_t getCrc32() const override { return Entry.CRC; }
46 uint64_t getCodeByteSize() const override { return Entry.FileSize; }
48 std::string getFileName() const override {
49 StringRef Ret = cantFail(Strings.getStringForID(Entry.FileNI),
50 "InjectedSourceStream should have rejected this");
51 return Ret;
54 std::string getObjectFileName() const override {
55 StringRef Ret = cantFail(Strings.getStringForID(Entry.ObjNI),
56 "InjectedSourceStream should have rejected this");
57 return Ret;
60 std::string getVirtualFileName() const override {
61 StringRef Ret = cantFail(Strings.getStringForID(Entry.VFileNI),
62 "InjectedSourceStream should have rejected this");
63 return Ret;
66 uint32_t getCompression() const override { return Entry.Compression; }
68 std::string getCode() const override {
69 // Get name of stream storing the data.
70 StringRef VName =
71 cantFail(Strings.getStringForID(Entry.VFileNI),
72 "InjectedSourceStream should have rejected this");
73 std::string StreamName = ("/src/files/" + VName).str();
75 // Find stream with that name and read its data.
76 // FIXME: Consider validating (or even loading) all this in
77 // InjectedSourceStream so that no error can happen here.
78 auto ExpectedFileStream = File.safelyCreateNamedStream(StreamName);
79 if (!ExpectedFileStream) {
80 consumeError(ExpectedFileStream.takeError());
81 return "(failed to open data stream)";
84 auto Data = readStreamData(**ExpectedFileStream, Entry.FileSize);
85 if (!Data) {
86 consumeError(Data.takeError());
87 return "(failed to read data)";
89 return *Data;
93 } // namespace
95 NativeEnumInjectedSources::NativeEnumInjectedSources(
96 PDBFile &File, const InjectedSourceStream &IJS,
97 const PDBStringTable &Strings)
98 : File(File), Stream(IJS), Strings(Strings), Cur(Stream.begin()) {}
100 uint32_t NativeEnumInjectedSources::getChildCount() const {
101 return static_cast<uint32_t>(Stream.size());
104 std::unique_ptr<IPDBInjectedSource>
105 NativeEnumInjectedSources::getChildAtIndex(uint32_t N) const {
106 if (N >= getChildCount())
107 return nullptr;
108 return std::make_unique<NativeInjectedSource>(std::next(Stream.begin(), N)->second,
109 File, Strings);
112 std::unique_ptr<IPDBInjectedSource> NativeEnumInjectedSources::getNext() {
113 if (Cur == Stream.end())
114 return nullptr;
115 return std::make_unique<NativeInjectedSource>((Cur++)->second, File, Strings);
118 void NativeEnumInjectedSources::reset() { Cur = Stream.begin(); }