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1 //===- DbiStreamBuilder.cpp - PDB Dbi Stream Creation -----------*- C++ -*-===//
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/DbiStreamBuilder.h"
10
11 #include "llvm/ADT/ArrayRef.h"
12 #include "llvm/BinaryFormat/COFF.h"
13 #include "llvm/DebugInfo/CodeView/DebugFrameDataSubsection.h"
14 #include "llvm/DebugInfo/MSF/MSFBuilder.h"
15 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
16 #include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.h"
17 #include "llvm/DebugInfo/PDB/Native/DbiStream.h"
18 #include "llvm/DebugInfo/PDB/Native/RawError.h"
19 #include "llvm/Object/COFF.h"
20 #include "llvm/Support/BinaryStreamWriter.h"
21
22 using namespace llvm;
23 using namespace llvm::codeview;
24 using namespace llvm::msf;
25 using namespace llvm::pdb;
26
27 DbiStreamBuilder::DbiStreamBuilder(msf::MSFBuilder &Msf)
28     : Msf(Msf), Allocator(Msf.getAllocator()), Age(1), BuildNumber(0),
29       PdbDllVersion(0), PdbDllRbld(0), Flags(0), MachineType(PDB_Machine::x86),
30       Header(nullptr) {}
31
32 DbiStreamBuilder::~DbiStreamBuilder() {}
33
34 void DbiStreamBuilder::setVersionHeader(PdbRaw_DbiVer V) { VerHeader = V; }
35
36 void DbiStreamBuilder::setAge(uint32_t A) { Age = A; }
37
38 void DbiStreamBuilder::setBuildNumber(uint16_t B) { BuildNumber = B; }
39
40 void DbiStreamBuilder::setBuildNumber(uint8_t Major, uint8_t Minor) {
41   BuildNumber = (uint16_t(Major) << DbiBuildNo::BuildMajorShift) &
42                 DbiBuildNo::BuildMajorMask;
43   BuildNumber |= (uint16_t(Minor) << DbiBuildNo::BuildMinorShift) &
44                  DbiBuildNo::BuildMinorMask;
45   BuildNumber |= DbiBuildNo::NewVersionFormatMask;
46 }
47
48 void DbiStreamBuilder::setPdbDllVersion(uint16_t V) { PdbDllVersion = V; }
49
50 void DbiStreamBuilder::setPdbDllRbld(uint16_t R) { PdbDllRbld = R; }
51
52 void DbiStreamBuilder::setFlags(uint16_t F) { Flags = F; }
53
54 void DbiStreamBuilder::setMachineType(PDB_Machine M) { MachineType = M; }
55
56 void DbiStreamBuilder::setMachineType(COFF::MachineTypes M) {
57   // These enums are mirrors of each other, so we can just cast the value.
58   MachineType = static_cast<pdb::PDB_Machine>(static_cast<unsigned>(M));
59 }
60
61 void DbiStreamBuilder::setSectionMap(ArrayRef<SecMapEntry> SecMap) {
62   SectionMap = SecMap;
63 }
64
65 void DbiStreamBuilder::setGlobalsStreamIndex(uint32_t Index) {
66   GlobalsStreamIndex = Index;
67 }
68
69 void DbiStreamBuilder::setSymbolRecordStreamIndex(uint32_t Index) {
70   SymRecordStreamIndex = Index;
71 }
72
73 void DbiStreamBuilder::setPublicsStreamIndex(uint32_t Index) {
74   PublicsStreamIndex = Index;
75 }
76
77 void DbiStreamBuilder::addNewFpoData(const codeview::FrameData &FD) {
78   if (!NewFpoData.hasValue())
79     NewFpoData.emplace(false);
80
81   NewFpoData->addFrameData(FD);
82 }
83
84 void DbiStreamBuilder::addOldFpoData(const object::FpoData &FD) {
85   OldFpoData.push_back(FD);
86 }
87
88 Error DbiStreamBuilder::addDbgStream(pdb::DbgHeaderType Type,
89                                      ArrayRef<uint8_t> Data) {
90   assert(Type != DbgHeaderType::NewFPO &&
91          "NewFPO data should be written via addFrameData()!");
92
93   DbgStreams[(int)Type].emplace();
94   DbgStreams[(int)Type]->Size = Data.size();
95   DbgStreams[(int)Type]->WriteFn = [Data](BinaryStreamWriter &Writer) {
96     return Writer.writeArray(Data);
97   };
98   return Error::success();
99 }
100
101 uint32_t DbiStreamBuilder::addECName(StringRef Name) {
102   return ECNamesBuilder.insert(Name);
103 }
104
105 uint32_t DbiStreamBuilder::calculateSerializedLength() const {
106   // For now we only support serializing the header.
107   return sizeof(DbiStreamHeader) + calculateFileInfoSubstreamSize() +
108          calculateModiSubstreamSize() + calculateSectionContribsStreamSize() +
109          calculateSectionMapStreamSize() + calculateDbgStreamsSize() +
110          ECNamesBuilder.calculateSerializedSize();
111 }
112
113 Expected<DbiModuleDescriptorBuilder &>
114 DbiStreamBuilder::addModuleInfo(StringRef ModuleName) {
115   uint32_t Index = ModiList.size();
116   ModiList.push_back(
117       llvm::make_unique<DbiModuleDescriptorBuilder>(ModuleName, Index, Msf));
118   return *ModiList.back();
119 }
120
121 Error DbiStreamBuilder::addModuleSourceFile(DbiModuleDescriptorBuilder &Module,
122                                             StringRef File) {
123   uint32_t Index = SourceFileNames.size();
124   SourceFileNames.insert(std::make_pair(File, Index));
125   Module.addSourceFile(File);
126   return Error::success();
127 }
128
129 Expected<uint32_t> DbiStreamBuilder::getSourceFileNameIndex(StringRef File) {
130   auto NameIter = SourceFileNames.find(File);
131   if (NameIter == SourceFileNames.end())
132     return make_error<RawError>(raw_error_code::no_entry,
133                                 "The specified source file was not found");
134   return NameIter->getValue();
135 }
136
137 uint32_t DbiStreamBuilder::calculateModiSubstreamSize() const {
138   uint32_t Size = 0;
139   for (const auto &M : ModiList)
140     Size += M->calculateSerializedLength();
141   return Size;
142 }
143
144 uint32_t DbiStreamBuilder::calculateSectionContribsStreamSize() const {
145   if (SectionContribs.empty())
146     return 0;
147   return sizeof(enum PdbRaw_DbiSecContribVer) +
148          sizeof(SectionContribs[0]) * SectionContribs.size();
149 }
150
151 uint32_t DbiStreamBuilder::calculateSectionMapStreamSize() const {
152   if (SectionMap.empty())
153     return 0;
154   return sizeof(SecMapHeader) + sizeof(SecMapEntry) * SectionMap.size();
155 }
156
157 uint32_t DbiStreamBuilder::calculateNamesOffset() const {
158   uint32_t Offset = 0;
159   Offset += sizeof(ulittle16_t);                         // NumModules
160   Offset += sizeof(ulittle16_t);                         // NumSourceFiles
161   Offset += ModiList.size() * sizeof(ulittle16_t);       // ModIndices
162   Offset += ModiList.size() * sizeof(ulittle16_t);       // ModFileCounts
163   uint32_t NumFileInfos = 0;
164   for (const auto &M : ModiList)
165     NumFileInfos += M->source_files().size();
166   Offset += NumFileInfos * sizeof(ulittle32_t); // FileNameOffsets
167   return Offset;
168 }
169
170 uint32_t DbiStreamBuilder::calculateFileInfoSubstreamSize() const {
171   uint32_t Size = calculateNamesOffset();
172   Size += calculateNamesBufferSize();
173   return alignTo(Size, sizeof(uint32_t));
174 }
175
176 uint32_t DbiStreamBuilder::calculateNamesBufferSize() const {
177   uint32_t Size = 0;
178   for (const auto &F : SourceFileNames) {
179     Size += F.getKeyLength() + 1; // Names[I];
180   }
181   return Size;
182 }
183
184 uint32_t DbiStreamBuilder::calculateDbgStreamsSize() const {
185   return DbgStreams.size() * sizeof(uint16_t);
186 }
187
188 Error DbiStreamBuilder::generateFileInfoSubstream() {
189   uint32_t Size = calculateFileInfoSubstreamSize();
190   auto Data = Allocator.Allocate<uint8_t>(Size);
191   uint32_t NamesOffset = calculateNamesOffset();
192
193   FileInfoBuffer = MutableBinaryByteStream(MutableArrayRef<uint8_t>(Data, Size),
194                                            llvm::support::little);
195
196   WritableBinaryStreamRef MetadataBuffer =
197       WritableBinaryStreamRef(FileInfoBuffer).keep_front(NamesOffset);
198   BinaryStreamWriter MetadataWriter(MetadataBuffer);
199
200   uint16_t ModiCount = std::min<uint32_t>(UINT16_MAX, ModiList.size());
201   uint16_t FileCount = std::min<uint32_t>(UINT16_MAX, SourceFileNames.size());
202   if (auto EC = MetadataWriter.writeInteger(ModiCount)) // NumModules
203     return EC;
204   if (auto EC = MetadataWriter.writeInteger(FileCount)) // NumSourceFiles
205     return EC;
206   for (uint16_t I = 0; I < ModiCount; ++I) {
207     if (auto EC = MetadataWriter.writeInteger(I)) // Mod Indices
208       return EC;
209   }
210   for (const auto &MI : ModiList) {
211     FileCount = static_cast<uint16_t>(MI->source_files().size());
212     if (auto EC = MetadataWriter.writeInteger(FileCount)) // Mod File Counts
213       return EC;
214   }
215
216   // Before writing the FileNameOffsets array, write the NamesBuffer array.
217   // A side effect of this is that this will actually compute the various
218   // file name offsets, so we can then go back and write the FileNameOffsets
219   // array to the other substream.
220   NamesBuffer = WritableBinaryStreamRef(FileInfoBuffer).drop_front(NamesOffset);
221   BinaryStreamWriter NameBufferWriter(NamesBuffer);
222   for (auto &Name : SourceFileNames) {
223     Name.second = NameBufferWriter.getOffset();
224     if (auto EC = NameBufferWriter.writeCString(Name.getKey()))
225       return EC;
226   }
227
228   for (const auto &MI : ModiList) {
229     for (StringRef Name : MI->source_files()) {
230       auto Result = SourceFileNames.find(Name);
231       if (Result == SourceFileNames.end())
232         return make_error<RawError>(raw_error_code::no_entry,
233                                     "The source file was not found.");
234       if (auto EC = MetadataWriter.writeInteger(Result->second))
235         return EC;
236     }
237   }
238
239   if (auto EC = NameBufferWriter.padToAlignment(sizeof(uint32_t)))
240     return EC;
241
242   if (NameBufferWriter.bytesRemaining() > 0)
243     return make_error<RawError>(raw_error_code::invalid_format,
244                                 "The names buffer contained unexpected data.");
245
246   if (MetadataWriter.bytesRemaining() > sizeof(uint32_t))
247     return make_error<RawError>(
248         raw_error_code::invalid_format,
249         "The metadata buffer contained unexpected data.");
250
251   return Error::success();
252 }
253
254 Error DbiStreamBuilder::finalize() {
255   if (Header)
256     return Error::success();
257
258   for (auto &MI : ModiList)
259     MI->finalize();
260
261   if (auto EC = generateFileInfoSubstream())
262     return EC;
263
264   DbiStreamHeader *H = Allocator.Allocate<DbiStreamHeader>();
265   ::memset(H, 0, sizeof(DbiStreamHeader));
266   H->VersionHeader = *VerHeader;
267   H->VersionSignature = -1;
268   H->Age = Age;
269   H->BuildNumber = BuildNumber;
270   H->Flags = Flags;
271   H->PdbDllRbld = PdbDllRbld;
272   H->PdbDllVersion = PdbDllVersion;
273   H->MachineType = static_cast<uint16_t>(MachineType);
274
275   H->ECSubstreamSize = ECNamesBuilder.calculateSerializedSize();
276   H->FileInfoSize = FileInfoBuffer.getLength();
277   H->ModiSubstreamSize = calculateModiSubstreamSize();
278   H->OptionalDbgHdrSize = DbgStreams.size() * sizeof(uint16_t);
279   H->SecContrSubstreamSize = calculateSectionContribsStreamSize();
280   H->SectionMapSize = calculateSectionMapStreamSize();
281   H->TypeServerSize = 0;
282   H->SymRecordStreamIndex = SymRecordStreamIndex;
283   H->PublicSymbolStreamIndex = PublicsStreamIndex;
284   H->MFCTypeServerIndex = 0; // Not sure what this is, but link.exe writes 0.
285   H->GlobalSymbolStreamIndex = GlobalsStreamIndex;
286
287   Header = H;
288   return Error::success();
289 }
290
291 Error DbiStreamBuilder::finalizeMsfLayout() {
292   if (NewFpoData.hasValue()) {
293     DbgStreams[(int)DbgHeaderType::NewFPO].emplace();
294     DbgStreams[(int)DbgHeaderType::NewFPO]->Size =
295         NewFpoData->calculateSerializedSize();
296     DbgStreams[(int)DbgHeaderType::NewFPO]->WriteFn =
297         [this](BinaryStreamWriter &Writer) {
298           return NewFpoData->commit(Writer);
299         };
300   }
301
302   if (!OldFpoData.empty()) {
303     DbgStreams[(int)DbgHeaderType::FPO].emplace();
304     DbgStreams[(int)DbgHeaderType::FPO]->Size =
305         sizeof(object::FpoData) * OldFpoData.size();
306     DbgStreams[(int)DbgHeaderType::FPO]->WriteFn =
307         [this](BinaryStreamWriter &Writer) {
308           return Writer.writeArray(makeArrayRef(OldFpoData));
309         };
310   }
311
312   for (auto &S : DbgStreams) {
313     if (!S.hasValue())
314       continue;
315     auto ExpectedIndex = Msf.addStream(S->Size);
316     if (!ExpectedIndex)
317       return ExpectedIndex.takeError();
318     S->StreamNumber = *ExpectedIndex;
319   }
320
321   for (auto &MI : ModiList) {
322     if (auto EC = MI->finalizeMsfLayout())
323       return EC;
324   }
325
326   uint32_t Length = calculateSerializedLength();
327   if (auto EC = Msf.setStreamSize(StreamDBI, Length))
328     return EC;
329   return Error::success();
330 }
331
332 static uint16_t toSecMapFlags(uint32_t Flags) {
333   uint16_t Ret = 0;
334   if (Flags & COFF::IMAGE_SCN_MEM_READ)
335     Ret |= static_cast<uint16_t>(OMFSegDescFlags::Read);
336   if (Flags & COFF::IMAGE_SCN_MEM_WRITE)
337     Ret |= static_cast<uint16_t>(OMFSegDescFlags::Write);
338   if (Flags & COFF::IMAGE_SCN_MEM_EXECUTE)
339     Ret |= static_cast<uint16_t>(OMFSegDescFlags::Execute);
340   if (Flags & COFF::IMAGE_SCN_MEM_EXECUTE)
341     Ret |= static_cast<uint16_t>(OMFSegDescFlags::Execute);
342   if (!(Flags & COFF::IMAGE_SCN_MEM_16BIT))
343     Ret |= static_cast<uint16_t>(OMFSegDescFlags::AddressIs32Bit);
344
345   // This seems always 1.
346   Ret |= static_cast<uint16_t>(OMFSegDescFlags::IsSelector);
347
348   return Ret;
349 }
350
351 // A utility function to create a Section Map for a given list of COFF sections.
352 //
353 // A Section Map seem to be a copy of a COFF section list in other format.
354 // I don't know why a PDB file contains both a COFF section header and
355 // a Section Map, but it seems it must be present in a PDB.
356 std::vector<SecMapEntry> DbiStreamBuilder::createSectionMap(
357     ArrayRef<llvm::object::coff_section> SecHdrs) {
358   std::vector<SecMapEntry> Ret;
359   int Idx = 0;
360
361   auto Add = [&]() -> SecMapEntry & {
362     Ret.emplace_back();
363     auto &Entry = Ret.back();
364     memset(&Entry, 0, sizeof(Entry));
365
366     Entry.Frame = Idx + 1;
367
368     // We don't know the meaning of these fields yet.
369     Entry.SecName = UINT16_MAX;
370     Entry.ClassName = UINT16_MAX;
371
372     return Entry;
373   };
374
375   for (auto &Hdr : SecHdrs) {
376     auto &Entry = Add();
377     Entry.Flags = toSecMapFlags(Hdr.Characteristics);
378     Entry.SecByteLength = Hdr.VirtualSize;
379     ++Idx;
380   }
381
382   // The last entry is for absolute symbols.
383   auto &Entry = Add();
384   Entry.Flags = static_cast<uint16_t>(OMFSegDescFlags::AddressIs32Bit) |
385                 static_cast<uint16_t>(OMFSegDescFlags::IsAbsoluteAddress);
386   Entry.SecByteLength = UINT32_MAX;
387
388   return Ret;
389 }
390
391 Error DbiStreamBuilder::commit(const msf::MSFLayout &Layout,
392                                WritableBinaryStreamRef MsfBuffer) {
393   if (auto EC = finalize())
394     return EC;
395
396   auto DbiS = WritableMappedBlockStream::createIndexedStream(
397       Layout, MsfBuffer, StreamDBI, Allocator);
398
399   BinaryStreamWriter Writer(*DbiS);
400   if (auto EC = Writer.writeObject(*Header))
401     return EC;
402
403   for (auto &M : ModiList) {
404     if (auto EC = M->commit(Writer, Layout, MsfBuffer))
405       return EC;
406   }
407
408   if (!SectionContribs.empty()) {
409     if (auto EC = Writer.writeEnum(DbiSecContribVer60))
410       return EC;
411     if (auto EC = Writer.writeArray(makeArrayRef(SectionContribs)))
412       return EC;
413   }
414
415   if (!SectionMap.empty()) {
416     ulittle16_t Size = static_cast<ulittle16_t>(SectionMap.size());
417     SecMapHeader SMHeader = {Size, Size};
418     if (auto EC = Writer.writeObject(SMHeader))
419       return EC;
420     if (auto EC = Writer.writeArray(SectionMap))
421       return EC;
422   }
423
424   if (auto EC = Writer.writeStreamRef(FileInfoBuffer))
425     return EC;
426
427   if (auto EC = ECNamesBuilder.commit(Writer))
428     return EC;
429
430   for (auto &Stream : DbgStreams) {
431     uint16_t StreamNumber = kInvalidStreamIndex;
432     if (Stream.hasValue())
433       StreamNumber = Stream->StreamNumber;
434     if (auto EC = Writer.writeInteger(StreamNumber))
435       return EC;
436   }
437
438   for (auto &Stream : DbgStreams) {
439     if (!Stream.hasValue())
440       continue;
441     assert(Stream->StreamNumber != kInvalidStreamIndex);
442
443     auto WritableStream = WritableMappedBlockStream::createIndexedStream(
444         Layout, MsfBuffer, Stream->StreamNumber, Allocator);
445     BinaryStreamWriter DbgStreamWriter(*WritableStream);
446
447     if (auto EC = Stream->WriteFn(DbgStreamWriter))
448       return EC;
449   }
450
451   if (Writer.bytesRemaining() > 0)
452     return make_error<RawError>(raw_error_code::invalid_format,
453                                 "Unexpected bytes found in DBI Stream");
454   return Error::success();
455 }