1 //===- DWARFEmitter - Convert YAML to DWARF binary data -------------------===//
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 /// \file
10 /// The DWARF component of yaml2obj. Provided as library code for tests.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/ObjectYAML/DWARFEmitter.h"
15 #include "DWARFVisitor.h"
16 #include "llvm/ADT/StringMap.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/ObjectYAML/DWARFYAML.h"
19 #include "llvm/Support/Error.h"
20 #include "llvm/Support/Host.h"
21 #include "llvm/Support/LEB128.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/MemoryBuffer.h"
24 #include "llvm/Support/SwapByteOrder.h"
25 #include "llvm/Support/YAMLTraits.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <algorithm>
28 #include <cassert>
29 #include <cstddef>
30 #include <cstdint>
31 #include <memory>
32 #include <string>
33 #include <vector>
34 
35 using namespace llvm;
36 
37 template <typename T>
writeInteger(T Integer,raw_ostream & OS,bool IsLittleEndian)38 static void writeInteger(T Integer, raw_ostream &OS, bool IsLittleEndian) {
39   if (IsLittleEndian != sys::IsLittleEndianHost)
40     sys::swapByteOrder(Integer);
41   OS.write(reinterpret_cast<char *>(&Integer), sizeof(T));
42 }
43 
writeVariableSizedInteger(uint64_t Integer,size_t Size,raw_ostream & OS,bool IsLittleEndian)44 static void writeVariableSizedInteger(uint64_t Integer, size_t Size,
45                                       raw_ostream &OS, bool IsLittleEndian) {
46   if (8 == Size)
47     writeInteger((uint64_t)Integer, OS, IsLittleEndian);
48   else if (4 == Size)
49     writeInteger((uint32_t)Integer, OS, IsLittleEndian);
50   else if (2 == Size)
51     writeInteger((uint16_t)Integer, OS, IsLittleEndian);
52   else if (1 == Size)
53     writeInteger((uint8_t)Integer, OS, IsLittleEndian);
54   else
55     assert(false && "Invalid integer write size.");
56 }
57 
ZeroFillBytes(raw_ostream & OS,size_t Size)58 static void ZeroFillBytes(raw_ostream &OS, size_t Size) {
59   std::vector<uint8_t> FillData;
60   FillData.insert(FillData.begin(), Size, 0);
61   OS.write(reinterpret_cast<char *>(FillData.data()), Size);
62 }
63 
writeInitialLength(const DWARFYAML::InitialLength & Length,raw_ostream & OS,bool IsLittleEndian)64 static void writeInitialLength(const DWARFYAML::InitialLength &Length,
65                                raw_ostream &OS, bool IsLittleEndian) {
66   writeInteger((uint32_t)Length.TotalLength, OS, IsLittleEndian);
67   if (Length.isDWARF64())
68     writeInteger((uint64_t)Length.TotalLength64, OS, IsLittleEndian);
69 }
70 
EmitDebugStr(raw_ostream & OS,const DWARFYAML::Data & DI)71 void DWARFYAML::EmitDebugStr(raw_ostream &OS, const DWARFYAML::Data &DI) {
72   for (auto Str : DI.DebugStrings) {
73     OS.write(Str.data(), Str.size());
74     OS.write('\0');
75   }
76 }
77 
EmitDebugAbbrev(raw_ostream & OS,const DWARFYAML::Data & DI)78 void DWARFYAML::EmitDebugAbbrev(raw_ostream &OS, const DWARFYAML::Data &DI) {
79   for (auto AbbrevDecl : DI.AbbrevDecls) {
80     encodeULEB128(AbbrevDecl.Code, OS);
81     // XXX BINARYEN This is a terminator.
82     if (!AbbrevDecl.Code) {
83       continue;
84     }
85     encodeULEB128(AbbrevDecl.Tag, OS);
86     OS.write(AbbrevDecl.Children);
87     for (auto Attr : AbbrevDecl.Attributes) {
88       encodeULEB128(Attr.Attribute, OS);
89       encodeULEB128(Attr.Form, OS);
90       if (Attr.Form == dwarf::DW_FORM_implicit_const)
91         encodeSLEB128(Attr.Value, OS);
92     }
93     encodeULEB128(0, OS);
94     encodeULEB128(0, OS);
95   }
96 }
97 
EmitDebugAranges(raw_ostream & OS,const DWARFYAML::Data & DI)98 void DWARFYAML::EmitDebugAranges(raw_ostream &OS, const DWARFYAML::Data &DI) {
99   for (auto Range : DI.ARanges) {
100     auto HeaderStart = OS.tell();
101     writeInitialLength(Range.Length, OS, DI.IsLittleEndian);
102     writeInteger((uint16_t)Range.Version, OS, DI.IsLittleEndian);
103     writeInteger((uint32_t)Range.CuOffset, OS, DI.IsLittleEndian);
104     writeInteger((uint8_t)Range.AddrSize, OS, DI.IsLittleEndian);
105     writeInteger((uint8_t)Range.SegSize, OS, DI.IsLittleEndian);
106 
107     auto HeaderSize = OS.tell() - HeaderStart;
108     auto FirstDescriptor = alignTo(HeaderSize, Range.AddrSize * 2);
109     ZeroFillBytes(OS, FirstDescriptor - HeaderSize);
110 
111     for (auto Descriptor : Range.Descriptors) {
112       writeVariableSizedInteger(Descriptor.Address, Range.AddrSize, OS,
113                                 DI.IsLittleEndian);
114       writeVariableSizedInteger(Descriptor.Length, Range.AddrSize, OS,
115                                 DI.IsLittleEndian);
116     }
117     ZeroFillBytes(OS, Range.AddrSize * 2);
118   }
119 }
120 
121 // XXX BINARYEN
EmitDebugRanges(raw_ostream & OS,const DWARFYAML::Data & DI)122 void DWARFYAML::EmitDebugRanges(raw_ostream &OS, const DWARFYAML::Data &DI) {
123   // As DwarfStreamer.cpp says, "The debug_range section
124   // format is totally trivial, consisting just of pairs of address
125   // sized addresses describing the ranges." and apparently it ends
126   // with a null termination of a pair of zeros
127   for (auto Range : DI.Ranges) {
128     writeInteger((uint32_t)Range.Start, OS, DI.IsLittleEndian);
129     writeInteger((uint32_t)Range.End, OS, DI.IsLittleEndian);
130   }
131 }
132 
133 // XXX BINARYEN
EmitDebugLoc(raw_ostream & OS,const DWARFYAML::Data & DI)134 void DWARFYAML::EmitDebugLoc(raw_ostream &OS, const DWARFYAML::Data &DI) {
135   for (auto Loc : DI.Locs) {
136     writeInteger((uint32_t)Loc.Start, OS, DI.IsLittleEndian);
137     writeInteger((uint32_t)Loc.End, OS, DI.IsLittleEndian);
138     if (Loc.Start == 0 && Loc.End == 0) {
139       // End of a list.
140       continue;
141     }
142     if (Loc.Start != -1) {
143       writeInteger((uint16_t)Loc.Location.size(), OS, DI.IsLittleEndian);
144       for (auto x : Loc.Location) {
145         writeInteger((uint8_t)x, OS, DI.IsLittleEndian);
146       }
147     }
148   }
149 }
150 
EmitPubSection(raw_ostream & OS,const DWARFYAML::PubSection & Sect,bool IsLittleEndian)151 void DWARFYAML::EmitPubSection(raw_ostream &OS,
152                                const DWARFYAML::PubSection &Sect,
153                                bool IsLittleEndian) {
154   writeInitialLength(Sect.Length, OS, IsLittleEndian);
155   writeInteger((uint16_t)Sect.Version, OS, IsLittleEndian);
156   writeInteger((uint32_t)Sect.UnitOffset, OS, IsLittleEndian);
157   writeInteger((uint32_t)Sect.UnitSize, OS, IsLittleEndian);
158   for (auto Entry : Sect.Entries) {
159     writeInteger((uint32_t)Entry.DieOffset, OS, IsLittleEndian);
160     if (Sect.IsGNUStyle)
161       writeInteger((uint32_t)Entry.Descriptor, OS, IsLittleEndian);
162     OS.write(Entry.Name.data(), Entry.Name.size());
163     OS.write('\0');
164   }
165 }
166 
167 namespace {
168 /// An extension of the DWARFYAML::ConstVisitor which writes compile
169 /// units and DIEs to a stream.
170 class DumpVisitor : public DWARFYAML::ConstVisitor {
171   raw_ostream &OS;
172 
173   size_t StartPos; // XXX BINARYEN
174 
175 protected:
onStartCompileUnit(const DWARFYAML::Unit & CU)176   void onStartCompileUnit(const DWARFYAML::Unit &CU) override {
177     writeInitialLength(CU.Length, OS, DebugInfo.IsLittleEndian);
178     StartPos = OS.tell(); // XXX BINARYEN
179     writeInteger((uint16_t)CU.Version, OS, DebugInfo.IsLittleEndian);
180     if(CU.Version >= 5) {
181       writeInteger((uint8_t)CU.Type, OS, DebugInfo.IsLittleEndian);
182       writeInteger((uint8_t)CU.AddrSize, OS, DebugInfo.IsLittleEndian);
183       writeInteger((uint32_t)CU.AbbrOffset, OS, DebugInfo.IsLittleEndian);
184     }else {
185       writeInteger((uint32_t)CU.AbbrOffset, OS, DebugInfo.IsLittleEndian);
186       writeInteger((uint8_t)CU.AddrSize, OS, DebugInfo.IsLittleEndian);
187     }
188   }
189 
190   // XXX BINARYEN Make sure we emit the right size. We should not change the
191   // size as we only modify relocatable fields like addresses, and such fields
192   // have a fixed size, so any change is a bug.
onEndCompileUnit(const DWARFYAML::Unit & CU)193   void onEndCompileUnit(const DWARFYAML::Unit &CU) {
194     size_t EndPos = OS.tell();
195     if (EndPos - StartPos != CU.Length.getLength()) {
196       llvm_unreachable("compile unit size was incorrect");
197     }
198   }
199 
onStartDIE(const DWARFYAML::Unit & CU,const DWARFYAML::Entry & DIE)200   void onStartDIE(const DWARFYAML::Unit &CU,
201                   const DWARFYAML::Entry &DIE) override {
202     encodeULEB128(DIE.AbbrCode, OS);
203   }
204 
onValue(const uint8_t U)205   void onValue(const uint8_t U) override {
206     writeInteger(U, OS, DebugInfo.IsLittleEndian);
207   }
208 
onValue(const uint16_t U)209   void onValue(const uint16_t U) override {
210     writeInteger(U, OS, DebugInfo.IsLittleEndian);
211   }
212 
onValue(const uint32_t U)213   void onValue(const uint32_t U) override {
214     writeInteger(U, OS, DebugInfo.IsLittleEndian);
215   }
216 
onValue(const uint64_t U,const bool LEB=false)217   void onValue(const uint64_t U, const bool LEB = false) override {
218     if (LEB)
219       encodeULEB128(U, OS);
220     else
221       writeInteger(U, OS, DebugInfo.IsLittleEndian);
222   }
223 
onValue(const int64_t S,const bool LEB=false)224   void onValue(const int64_t S, const bool LEB = false) override {
225     if (LEB)
226       encodeSLEB128(S, OS);
227     else
228       writeInteger(S, OS, DebugInfo.IsLittleEndian);
229   }
230 
onValue(const StringRef String)231   void onValue(const StringRef String) override {
232     OS.write(String.data(), String.size());
233     OS.write('\0');
234   }
235 
onValue(const MemoryBufferRef MBR)236   void onValue(const MemoryBufferRef MBR) override {
237     OS.write(MBR.getBufferStart(), MBR.getBufferSize());
238   }
239 
240 public:
DumpVisitor(const DWARFYAML::Data & DI,raw_ostream & Out)241   DumpVisitor(const DWARFYAML::Data &DI, raw_ostream &Out)
242       : DWARFYAML::ConstVisitor(DI), OS(Out) {}
243 };
244 } // namespace
245 
EmitDebugInfo(raw_ostream & OS,const DWARFYAML::Data & DI)246 void DWARFYAML::EmitDebugInfo(raw_ostream &OS, const DWARFYAML::Data &DI) {
247   DumpVisitor Visitor(DI, OS);
248   Visitor.traverseDebugInfo();
249 }
250 
EmitFileEntry(raw_ostream & OS,const DWARFYAML::File & File)251 static void EmitFileEntry(raw_ostream &OS, const DWARFYAML::File &File) {
252   OS.write(File.Name.data(), File.Name.size());
253   OS.write('\0');
254   encodeULEB128(File.DirIdx, OS);
255   encodeULEB128(File.ModTime, OS);
256   encodeULEB128(File.Length, OS);
257 }
258 
259 // XXX BINARYEN: Refactor to an *Internal method that allows us to optionally
260 //               compute the new lengths.
EmitDebugLineInternal(raw_ostream & RealOS,const DWARFYAML::Data & DI,std::vector<size_t> * computedLengths)261 static void EmitDebugLineInternal(raw_ostream &RealOS,
262                                   const DWARFYAML::Data &DI,
263                                   std::vector<size_t>* computedLengths) {
264   for (auto &LineTable : DI.DebugLines) {
265     // XXX BINARYEN We need to update each line table's length. Write to a
266     // temp stream first, then get the size from that.
267     std::string Buffer;
268     raw_string_ostream OS(Buffer);
269 
270     // XXX BINARYEN writeInitialLength(LineTable.Length, OS, DI.IsLittleEndian);
271 
272     uint64_t SizeOfPrologueLength = LineTable.Length.isDWARF64() ? 8 : 4;
273     writeInteger((uint16_t)LineTable.Version, OS, DI.IsLittleEndian);
274     writeVariableSizedInteger(LineTable.PrologueLength, SizeOfPrologueLength,
275                               OS, DI.IsLittleEndian);
276     writeInteger((uint8_t)LineTable.MinInstLength, OS, DI.IsLittleEndian);
277     if (LineTable.Version >= 4)
278       writeInteger((uint8_t)LineTable.MaxOpsPerInst, OS, DI.IsLittleEndian);
279     writeInteger((uint8_t)LineTable.DefaultIsStmt, OS, DI.IsLittleEndian);
280     writeInteger((uint8_t)LineTable.LineBase, OS, DI.IsLittleEndian);
281     writeInteger((uint8_t)LineTable.LineRange, OS, DI.IsLittleEndian);
282     writeInteger((uint8_t)LineTable.OpcodeBase, OS, DI.IsLittleEndian);
283 
284     for (auto OpcodeLength : LineTable.StandardOpcodeLengths)
285       writeInteger((uint8_t)OpcodeLength, OS, DI.IsLittleEndian);
286 
287     for (auto IncludeDir : LineTable.IncludeDirs) {
288       OS.write(IncludeDir.data(), IncludeDir.size());
289       OS.write('\0');
290     }
291     OS.write('\0');
292 
293     for (auto File : LineTable.Files)
294       EmitFileEntry(OS, File);
295     OS.write('\0');
296 
297     for (auto Op : LineTable.Opcodes) {
298       writeInteger((uint8_t)Op.Opcode, OS, DI.IsLittleEndian);
299       if (Op.Opcode == 0) {
300         encodeULEB128(Op.ExtLen, OS);
301         writeInteger((uint8_t)Op.SubOpcode, OS, DI.IsLittleEndian);
302         switch (Op.SubOpcode) {
303         case dwarf::DW_LNE_set_address:
304         case dwarf::DW_LNE_set_discriminator:
305           writeVariableSizedInteger(Op.Data, DI.CompileUnits[0].AddrSize, OS,
306                                     DI.IsLittleEndian);
307           break;
308         case dwarf::DW_LNE_define_file:
309           EmitFileEntry(OS, Op.FileEntry);
310           break;
311         case dwarf::DW_LNE_end_sequence:
312           break;
313         default:
314           for (auto OpByte : Op.UnknownOpcodeData)
315             writeInteger((uint8_t)OpByte, OS, DI.IsLittleEndian);
316         }
317       } else if (Op.Opcode < LineTable.OpcodeBase) {
318         switch (Op.Opcode) {
319         case dwarf::DW_LNS_copy:
320         case dwarf::DW_LNS_negate_stmt:
321         case dwarf::DW_LNS_set_basic_block:
322         case dwarf::DW_LNS_const_add_pc:
323         case dwarf::DW_LNS_set_prologue_end:
324         case dwarf::DW_LNS_set_epilogue_begin:
325           break;
326 
327         case dwarf::DW_LNS_advance_pc:
328         case dwarf::DW_LNS_set_file:
329         case dwarf::DW_LNS_set_column:
330         case dwarf::DW_LNS_set_isa:
331           encodeULEB128(Op.Data, OS);
332           break;
333 
334         case dwarf::DW_LNS_advance_line:
335           encodeSLEB128(Op.SData, OS);
336           break;
337 
338         case dwarf::DW_LNS_fixed_advance_pc:
339           writeInteger((uint16_t)Op.Data, OS, DI.IsLittleEndian);
340           break;
341 
342         default:
343           for (auto OpData : Op.StandardOpcodeData) {
344             encodeULEB128(OpData, OS);
345           }
346         }
347       }
348     }
349     // XXX BINARYEN Write to the actual stream, with the proper size.
350     // We assume for now that the length fits in 32 bits.
351     size_t Size = OS.str().size();
352     if (Size >= UINT32_MAX) {
353       llvm_unreachable("Table is too big");
354     }
355     if (computedLengths) {
356       computedLengths->push_back(Size);
357     }
358     writeInteger((uint32_t)Size, RealOS, DI.IsLittleEndian);
359     RealOS << OS.str();
360   }
361 }
362 
EmitDebugLine(raw_ostream & RealOS,const DWARFYAML::Data & DI)363 void DWARFYAML::EmitDebugLine(raw_ostream &RealOS, const DWARFYAML::Data &DI) {
364   EmitDebugLineInternal(RealOS, DI, nullptr);
365 }
366 
ComputeDebugLine(Data & DI,std::vector<size_t> & computedLengths)367 void DWARFYAML::ComputeDebugLine(Data &DI,
368                                  std::vector<size_t>& computedLengths) {
369   // TODO: Avoid writing out the data, or at least cache it so we don't need to
370   //       do it again later.
371   std::string buffer;
372   llvm::raw_string_ostream tempStream(buffer);
373   EmitDebugLineInternal(tempStream, DI, &computedLengths);
374 }
375 
376 using EmitFuncType = void (*)(raw_ostream &, const DWARFYAML::Data &);
377 
378 static void
EmitDebugSectionImpl(const DWARFYAML::Data & DI,EmitFuncType EmitFunc,StringRef Sec,StringMap<std::unique_ptr<MemoryBuffer>> & OutputBuffers)379 EmitDebugSectionImpl(const DWARFYAML::Data &DI, EmitFuncType EmitFunc,
380                      StringRef Sec,
381                      StringMap<std::unique_ptr<MemoryBuffer>> &OutputBuffers) {
382   std::string Data;
383   raw_string_ostream DebugInfoStream(Data);
384   EmitFunc(DebugInfoStream, DI);
385   DebugInfoStream.flush();
386   if (!Data.empty())
387     OutputBuffers[Sec] = MemoryBuffer::getMemBufferCopy(Data);
388 }
389 
390 namespace {
391 class DIEFixupVisitor : public DWARFYAML::Visitor {
392   uint64_t Length;
393 
394 public:
DIEFixupVisitor(DWARFYAML::Data & DI)395   DIEFixupVisitor(DWARFYAML::Data &DI) : DWARFYAML::Visitor(DI){};
396 
397 private:
onStartCompileUnit(DWARFYAML::Unit & CU)398   virtual void onStartCompileUnit(DWARFYAML::Unit &CU) { Length = 7; }
399 
onEndCompileUnit(DWARFYAML::Unit & CU)400   virtual void onEndCompileUnit(DWARFYAML::Unit &CU) {
401     CU.Length.setLength(Length);
402   }
403 
onStartDIE(DWARFYAML::Unit & CU,DWARFYAML::Entry & DIE)404   virtual void onStartDIE(DWARFYAML::Unit &CU, DWARFYAML::Entry &DIE) {
405     Length += getULEB128Size(DIE.AbbrCode);
406   }
407 
onValue(const uint8_t U)408   virtual void onValue(const uint8_t U) { Length += 1; }
onValue(const uint16_t U)409   virtual void onValue(const uint16_t U) { Length += 2; }
onValue(const uint32_t U)410   virtual void onValue(const uint32_t U) { Length += 4; }
onValue(const uint64_t U,const bool LEB=false)411   virtual void onValue(const uint64_t U, const bool LEB = false) {
412     if (LEB)
413       Length += getULEB128Size(U);
414     else
415       Length += 8;
416   }
onValue(const int64_t S,const bool LEB=false)417   virtual void onValue(const int64_t S, const bool LEB = false) {
418     if (LEB)
419       Length += getSLEB128Size(S);
420     else
421       Length += 8;
422   }
onValue(const StringRef String)423   virtual void onValue(const StringRef String) { Length += String.size() + 1; }
424 
onValue(const MemoryBufferRef MBR)425   virtual void onValue(const MemoryBufferRef MBR) {
426     Length += MBR.getBufferSize();
427   }
428 };
429 } // namespace
430 
431 Expected<StringMap<std::unique_ptr<MemoryBuffer>>>
EmitDebugSections(StringRef YAMLString,bool ApplyFixups,bool IsLittleEndian)432 DWARFYAML::EmitDebugSections(StringRef YAMLString, bool ApplyFixups,
433                              bool IsLittleEndian) {
434   yaml::Input YIn(YAMLString);
435 
436   DWARFYAML::Data DI;
437   DI.IsLittleEndian = IsLittleEndian;
438   YIn >> DI;
439   if (YIn.error())
440     return errorCodeToError(YIn.error());
441 
442   if (ApplyFixups) {
443     DIEFixupVisitor DIFixer(DI);
444     DIFixer.traverseDebugInfo();
445   }
446 
447   StringMap<std::unique_ptr<MemoryBuffer>> DebugSections;
448   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugInfo, "debug_info",
449                        DebugSections);
450   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLine, "debug_line",
451                        DebugSections);
452   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugStr, "debug_str",
453                        DebugSections);
454   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAbbrev, "debug_abbrev",
455                        DebugSections);
456   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAranges, "debug_aranges",
457                        DebugSections);
458   return std::move(DebugSections);
459 }
460 
461 // XXX BINARYEN <--
462 namespace llvm {
463 namespace DWARFYAML {
464 StringMap<std::unique_ptr<MemoryBuffer>>
EmitDebugSections(llvm::DWARFYAML::Data & DI,bool ApplyFixups)465 EmitDebugSections(llvm::DWARFYAML::Data &DI, bool ApplyFixups) {
466   if (ApplyFixups) {
467     DIEFixupVisitor DIFixer(DI);
468     DIFixer.traverseDebugInfo();
469   }
470 
471   StringMap<std::unique_ptr<MemoryBuffer>> DebugSections;
472   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugInfo, "debug_info",
473                        DebugSections);
474   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLine, "debug_line",
475                        DebugSections);
476   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugStr, "debug_str",
477                        DebugSections);
478   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAbbrev, "debug_abbrev",
479                        DebugSections);
480   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAranges, "debug_aranges",
481                        DebugSections);
482   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugRanges, "debug_ranges",
483                        DebugSections); // XXX BINARYEN
484   EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLoc, "debug_loc",
485                        DebugSections); // XXX BINARYEN
486   return std::move(DebugSections);
487 }
488 } // namespace DWARFYAML
489 } // namespace llvm
490 // XXX BINARYEN -->
491