1 //===- DbiStream.cpp - PDB Dbi Stream (Stream 3) Access -------------------===//
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/DbiStream.h"
11 #include "llvm/ADT/StringRef.h"
12 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
13 #include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
14 #include "llvm/DebugInfo/PDB/Native/ISectionContribVisitor.h"
15 #include "llvm/DebugInfo/PDB/Native/PDBFile.h"
16 #include "llvm/DebugInfo/PDB/Native/RawConstants.h"
17 #include "llvm/DebugInfo/PDB/Native/RawError.h"
18 #include "llvm/DebugInfo/PDB/Native/RawTypes.h"
19 #include "llvm/DebugInfo/PDB/PDBTypes.h"
20 #include "llvm/Object/COFF.h"
21 #include "llvm/Support/BinaryStreamArray.h"
22 #include "llvm/Support/BinaryStreamReader.h"
23 #include "llvm/Support/Error.h"
24 #include <algorithm>
25 #include <cstddef>
26 #include <cstdint>
27 
28 using namespace llvm;
29 using namespace llvm::codeview;
30 using namespace llvm::msf;
31 using namespace llvm::pdb;
32 using namespace llvm::support;
33 
34 template <typename ContribType>
35 static Error loadSectionContribs(FixedStreamArray<ContribType> &Output,
36                                  BinaryStreamReader &Reader) {
37   if (Reader.bytesRemaining() % sizeof(ContribType) != 0)
38     return make_error<RawError>(
39         raw_error_code::corrupt_file,
40         "Invalid number of bytes of section contributions");
41 
42   uint32_t Count = Reader.bytesRemaining() / sizeof(ContribType);
43   if (auto EC = Reader.readArray(Output, Count))
44     return EC;
45   return Error::success();
46 }
47 
48 DbiStream::DbiStream(PDBFile &File, std::unique_ptr<MappedBlockStream> Stream)
49     : Pdb(File), Stream(std::move(Stream)), Header(nullptr) {}
50 
51 DbiStream::~DbiStream() = default;
52 
53 Error DbiStream::reload() {
54   BinaryStreamReader Reader(*Stream);
55 
56   if (Stream->getLength() < sizeof(DbiStreamHeader))
57     return make_error<RawError>(raw_error_code::corrupt_file,
58                                 "DBI Stream does not contain a header.");
59   if (auto EC = Reader.readObject(Header))
60     return make_error<RawError>(raw_error_code::corrupt_file,
61                                 "DBI Stream does not contain a header.");
62 
63   if (Header->VersionSignature != -1)
64     return make_error<RawError>(raw_error_code::corrupt_file,
65                                 "Invalid DBI version signature.");
66 
67   // Require at least version 7, which should be present in all PDBs
68   // produced in the last decade and allows us to avoid having to
69   // special case all kinds of complicated arcane formats.
70   if (Header->VersionHeader < PdbDbiV70)
71     return make_error<RawError>(raw_error_code::feature_unsupported,
72                                 "Unsupported DBI version.");
73 
74   if (Stream->getLength() !=
75       sizeof(DbiStreamHeader) + Header->ModiSubstreamSize +
76           Header->SecContrSubstreamSize + Header->SectionMapSize +
77           Header->FileInfoSize + Header->TypeServerSize +
78           Header->OptionalDbgHdrSize + Header->ECSubstreamSize)
79     return make_error<RawError>(raw_error_code::corrupt_file,
80                                 "DBI Length does not equal sum of substreams.");
81 
82   // Only certain substreams are guaranteed to be aligned.  Validate
83   // them here.
84   if (Header->ModiSubstreamSize % sizeof(uint32_t) != 0)
85     return make_error<RawError>(raw_error_code::corrupt_file,
86                                 "DBI MODI substream not aligned.");
87   if (Header->SecContrSubstreamSize % sizeof(uint32_t) != 0)
88     return make_error<RawError>(
89         raw_error_code::corrupt_file,
90         "DBI section contribution substream not aligned.");
91   if (Header->SectionMapSize % sizeof(uint32_t) != 0)
92     return make_error<RawError>(raw_error_code::corrupt_file,
93                                 "DBI section map substream not aligned.");
94   if (Header->FileInfoSize % sizeof(uint32_t) != 0)
95     return make_error<RawError>(raw_error_code::corrupt_file,
96                                 "DBI file info substream not aligned.");
97   if (Header->TypeServerSize % sizeof(uint32_t) != 0)
98     return make_error<RawError>(raw_error_code::corrupt_file,
99                                 "DBI type server substream not aligned.");
100 
101   if (auto EC = Reader.readSubstream(ModiSubstream, Header->ModiSubstreamSize))
102     return EC;
103 
104   if (auto EC = Reader.readSubstream(SecContrSubstream,
105                                      Header->SecContrSubstreamSize))
106     return EC;
107   if (auto EC = Reader.readSubstream(SecMapSubstream, Header->SectionMapSize))
108     return EC;
109   if (auto EC = Reader.readSubstream(FileInfoSubstream, Header->FileInfoSize))
110     return EC;
111   if (auto EC =
112           Reader.readSubstream(TypeServerMapSubstream, Header->TypeServerSize))
113     return EC;
114   if (auto EC = Reader.readSubstream(ECSubstream, Header->ECSubstreamSize))
115     return EC;
116   if (auto EC = Reader.readArray(
117           DbgStreams, Header->OptionalDbgHdrSize / sizeof(ulittle16_t)))
118     return EC;
119 
120   if (auto EC = Modules.initialize(ModiSubstream.StreamData,
121                                    FileInfoSubstream.StreamData))
122     return EC;
123 
124   if (auto EC = initializeSectionContributionData())
125     return EC;
126   if (auto EC = initializeSectionHeadersData())
127     return EC;
128   if (auto EC = initializeSectionMapData())
129     return EC;
130   if (auto EC = initializeFpoRecords())
131     return EC;
132 
133   if (Reader.bytesRemaining() > 0)
134     return make_error<RawError>(raw_error_code::corrupt_file,
135                                 "Found unexpected bytes in DBI Stream.");
136 
137   if (!ECSubstream.empty()) {
138     BinaryStreamReader ECReader(ECSubstream.StreamData);
139     if (auto EC = ECNames.reload(ECReader))
140       return EC;
141   }
142 
143   return Error::success();
144 }
145 
146 PdbRaw_DbiVer DbiStream::getDbiVersion() const {
147   uint32_t Value = Header->VersionHeader;
148   return static_cast<PdbRaw_DbiVer>(Value);
149 }
150 
151 uint32_t DbiStream::getAge() const { return Header->Age; }
152 
153 uint16_t DbiStream::getPublicSymbolStreamIndex() const {
154   return Header->PublicSymbolStreamIndex;
155 }
156 
157 uint16_t DbiStream::getGlobalSymbolStreamIndex() const {
158   return Header->GlobalSymbolStreamIndex;
159 }
160 
161 uint16_t DbiStream::getFlags() const { return Header->Flags; }
162 
163 bool DbiStream::isIncrementallyLinked() const {
164   return (Header->Flags & DbiFlags::FlagIncrementalMask) != 0;
165 }
166 
167 bool DbiStream::hasCTypes() const {
168   return (Header->Flags & DbiFlags::FlagHasCTypesMask) != 0;
169 }
170 
171 bool DbiStream::isStripped() const {
172   return (Header->Flags & DbiFlags::FlagStrippedMask) != 0;
173 }
174 
175 uint16_t DbiStream::getBuildNumber() const { return Header->BuildNumber; }
176 
177 uint16_t DbiStream::getBuildMajorVersion() const {
178   return (Header->BuildNumber & DbiBuildNo::BuildMajorMask) >>
179          DbiBuildNo::BuildMajorShift;
180 }
181 
182 uint16_t DbiStream::getBuildMinorVersion() const {
183   return (Header->BuildNumber & DbiBuildNo::BuildMinorMask) >>
184          DbiBuildNo::BuildMinorShift;
185 }
186 
187 uint16_t DbiStream::getPdbDllRbld() const { return Header->PdbDllRbld; }
188 
189 uint32_t DbiStream::getPdbDllVersion() const { return Header->PdbDllVersion; }
190 
191 uint32_t DbiStream::getSymRecordStreamIndex() const {
192   return Header->SymRecordStreamIndex;
193 }
194 
195 PDB_Machine DbiStream::getMachineType() const {
196   uint16_t Machine = Header->MachineType;
197   return static_cast<PDB_Machine>(Machine);
198 }
199 
200 FixedStreamArray<object::coff_section> DbiStream::getSectionHeaders() {
201   return SectionHeaders;
202 }
203 
204 FixedStreamArray<object::FpoData> DbiStream::getFpoRecords() {
205   return FpoRecords;
206 }
207 
208 const DbiModuleList &DbiStream::modules() const { return Modules; }
209 
210 FixedStreamArray<SecMapEntry> DbiStream::getSectionMap() const {
211   return SectionMap;
212 }
213 
214 void DbiStream::visitSectionContributions(
215     ISectionContribVisitor &Visitor) const {
216   if (!SectionContribs.empty()) {
217     assert(SectionContribVersion == DbiSecContribVer60);
218     for (auto &SC : SectionContribs)
219       Visitor.visit(SC);
220   } else if (!SectionContribs2.empty()) {
221     assert(SectionContribVersion == DbiSecContribV2);
222     for (auto &SC : SectionContribs2)
223       Visitor.visit(SC);
224   }
225 }
226 
227 Expected<StringRef> DbiStream::getECName(uint32_t NI) const {
228   return ECNames.getStringForID(NI);
229 }
230 
231 Error DbiStream::initializeSectionContributionData() {
232   if (SecContrSubstream.empty())
233     return Error::success();
234 
235   BinaryStreamReader SCReader(SecContrSubstream.StreamData);
236   if (auto EC = SCReader.readEnum(SectionContribVersion))
237     return EC;
238 
239   if (SectionContribVersion == DbiSecContribVer60)
240     return loadSectionContribs<SectionContrib>(SectionContribs, SCReader);
241   if (SectionContribVersion == DbiSecContribV2)
242     return loadSectionContribs<SectionContrib2>(SectionContribs2, SCReader);
243 
244   return make_error<RawError>(raw_error_code::feature_unsupported,
245                               "Unsupported DBI Section Contribution version");
246 }
247 
248 // Initializes this->SectionHeaders.
249 Error DbiStream::initializeSectionHeadersData() {
250   if (DbgStreams.size() == 0)
251     return Error::success();
252 
253   uint32_t StreamNum = getDebugStreamIndex(DbgHeaderType::SectionHdr);
254   if (StreamNum == kInvalidStreamIndex)
255     return Error::success();
256 
257   if (StreamNum >= Pdb.getNumStreams())
258     return make_error<RawError>(raw_error_code::no_stream);
259 
260   auto SHS = MappedBlockStream::createIndexedStream(
261       Pdb.getMsfLayout(), Pdb.getMsfBuffer(), StreamNum, Pdb.getAllocator());
262 
263   size_t StreamLen = SHS->getLength();
264   if (StreamLen % sizeof(object::coff_section))
265     return make_error<RawError>(raw_error_code::corrupt_file,
266                                 "Corrupted section header stream.");
267 
268   size_t NumSections = StreamLen / sizeof(object::coff_section);
269   BinaryStreamReader Reader(*SHS);
270   if (auto EC = Reader.readArray(SectionHeaders, NumSections))
271     return make_error<RawError>(raw_error_code::corrupt_file,
272                                 "Could not read a bitmap.");
273 
274   SectionHeaderStream = std::move(SHS);
275   return Error::success();
276 }
277 
278 // Initializes this->Fpos.
279 Error DbiStream::initializeFpoRecords() {
280   if (DbgStreams.size() == 0)
281     return Error::success();
282 
283   uint32_t StreamNum = getDebugStreamIndex(DbgHeaderType::NewFPO);
284 
285   // This means there is no FPO data.
286   if (StreamNum == kInvalidStreamIndex)
287     return Error::success();
288 
289   if (StreamNum >= Pdb.getNumStreams())
290     return make_error<RawError>(raw_error_code::no_stream);
291 
292   auto FS = MappedBlockStream::createIndexedStream(
293       Pdb.getMsfLayout(), Pdb.getMsfBuffer(), StreamNum, Pdb.getAllocator());
294 
295   size_t StreamLen = FS->getLength();
296   if (StreamLen % sizeof(object::FpoData))
297     return make_error<RawError>(raw_error_code::corrupt_file,
298                                 "Corrupted New FPO stream.");
299 
300   size_t NumRecords = StreamLen / sizeof(object::FpoData);
301   BinaryStreamReader Reader(*FS);
302   if (auto EC = Reader.readArray(FpoRecords, NumRecords))
303     return make_error<RawError>(raw_error_code::corrupt_file,
304                                 "Corrupted New FPO stream.");
305   FpoStream = std::move(FS);
306   return Error::success();
307 }
308 
309 BinarySubstreamRef DbiStream::getSectionContributionData() const {
310   return SecContrSubstream;
311 }
312 
313 BinarySubstreamRef DbiStream::getSecMapSubstreamData() const {
314   return SecMapSubstream;
315 }
316 
317 BinarySubstreamRef DbiStream::getModiSubstreamData() const {
318   return ModiSubstream;
319 }
320 
321 BinarySubstreamRef DbiStream::getFileInfoSubstreamData() const {
322   return FileInfoSubstream;
323 }
324 
325 BinarySubstreamRef DbiStream::getTypeServerMapSubstreamData() const {
326   return TypeServerMapSubstream;
327 }
328 
329 BinarySubstreamRef DbiStream::getECSubstreamData() const { return ECSubstream; }
330 
331 Error DbiStream::initializeSectionMapData() {
332   if (SecMapSubstream.empty())
333     return Error::success();
334 
335   BinaryStreamReader SMReader(SecMapSubstream.StreamData);
336   const SecMapHeader *Header;
337   if (auto EC = SMReader.readObject(Header))
338     return EC;
339   if (auto EC = SMReader.readArray(SectionMap, Header->SecCount))
340     return EC;
341   return Error::success();
342 }
343 
344 uint32_t DbiStream::getDebugStreamIndex(DbgHeaderType Type) const {
345   uint16_t T = static_cast<uint16_t>(Type);
346   if (T >= DbgStreams.size())
347     return kInvalidStreamIndex;
348   return DbgStreams[T];
349 }
350