xref: /llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp (revision 18eafb6c688fbef06a133fd6fe5d523a546f6477)
1 //===-- MCObjectFileInfo.cpp - Object File Information --------------------===//
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/MC/MCObjectFileInfo.h"
11 #include "llvm/ADT/StringExtras.h"
12 #include "llvm/ADT/Triple.h"
13 #include "llvm/MC/MCAsmInfo.h"
14 #include "llvm/MC/MCContext.h"
15 #include "llvm/MC/MCSection.h"
16 #include "llvm/MC/MCSectionCOFF.h"
17 #include "llvm/MC/MCSectionELF.h"
18 #include "llvm/MC/MCSectionMachO.h"
19 #include "llvm/MC/MCSectionWasm.h"
20 #include "llvm/Support/COFF.h"
21 #include "llvm/Support/ELF.h"
22 
23 using namespace llvm;
24 
25 static bool useCompactUnwind(const Triple &T) {
26   // Only on darwin.
27   if (!T.isOSDarwin())
28     return false;
29 
30   // aarch64 always has it.
31   if (T.getArch() == Triple::aarch64)
32     return true;
33 
34   // armv7k always has it.
35   if (T.isWatchABI())
36     return true;
37 
38   // Use it on newer version of OS X.
39   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
40     return true;
41 
42   // And the iOS simulator.
43   if (T.isiOS() &&
44       (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
45     return true;
46 
47   return false;
48 }
49 
50 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
51   // MachO
52   SupportsWeakOmittedEHFrame = false;
53 
54   EHFrameSection = Ctx->getMachOSection(
55       "__TEXT", "__eh_frame",
56       MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
57           MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
58       SectionKind::getReadOnly());
59 
60   if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
61     SupportsCompactUnwindWithoutEHFrame = true;
62 
63   if (T.isWatchABI())
64     OmitDwarfIfHaveCompactUnwind = true;
65 
66   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
67     | dwarf::DW_EH_PE_sdata4;
68   LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
69   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
70     dwarf::DW_EH_PE_sdata4;
71 
72   // .comm doesn't support alignment before Leopard.
73   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
74     CommDirectiveSupportsAlignment = false;
75 
76   TextSection // .text
77     = Ctx->getMachOSection("__TEXT", "__text",
78                            MachO::S_ATTR_PURE_INSTRUCTIONS,
79                            SectionKind::getText());
80   DataSection // .data
81       = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData());
82 
83   // BSSSection might not be expected initialized on msvc.
84   BSSSection = nullptr;
85 
86   TLSDataSection // .tdata
87       = Ctx->getMachOSection("__DATA", "__thread_data",
88                              MachO::S_THREAD_LOCAL_REGULAR,
89                              SectionKind::getData());
90   TLSBSSSection // .tbss
91     = Ctx->getMachOSection("__DATA", "__thread_bss",
92                            MachO::S_THREAD_LOCAL_ZEROFILL,
93                            SectionKind::getThreadBSS());
94 
95   // TODO: Verify datarel below.
96   TLSTLVSection // .tlv
97       = Ctx->getMachOSection("__DATA", "__thread_vars",
98                              MachO::S_THREAD_LOCAL_VARIABLES,
99                              SectionKind::getData());
100 
101   TLSThreadInitSection = Ctx->getMachOSection(
102       "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
103       SectionKind::getData());
104 
105   CStringSection // .cstring
106     = Ctx->getMachOSection("__TEXT", "__cstring",
107                            MachO::S_CSTRING_LITERALS,
108                            SectionKind::getMergeable1ByteCString());
109   UStringSection
110     = Ctx->getMachOSection("__TEXT","__ustring", 0,
111                            SectionKind::getMergeable2ByteCString());
112   FourByteConstantSection // .literal4
113     = Ctx->getMachOSection("__TEXT", "__literal4",
114                            MachO::S_4BYTE_LITERALS,
115                            SectionKind::getMergeableConst4());
116   EightByteConstantSection // .literal8
117     = Ctx->getMachOSection("__TEXT", "__literal8",
118                            MachO::S_8BYTE_LITERALS,
119                            SectionKind::getMergeableConst8());
120 
121   SixteenByteConstantSection // .literal16
122       = Ctx->getMachOSection("__TEXT", "__literal16",
123                              MachO::S_16BYTE_LITERALS,
124                              SectionKind::getMergeableConst16());
125 
126   ReadOnlySection  // .const
127     = Ctx->getMachOSection("__TEXT", "__const", 0,
128                            SectionKind::getReadOnly());
129 
130   // If the target is not powerpc, map the coal sections to the non-coal
131   // sections.
132   //
133   // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
134   // "__TEXT/__const_coal"  => section "__TEXT/__const"
135   // "__DATA/__datacoal_nt" => section "__DATA/__data"
136   Triple::ArchType ArchTy = T.getArch();
137 
138   if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
139     TextCoalSection
140       = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
141                              MachO::S_COALESCED |
142                              MachO::S_ATTR_PURE_INSTRUCTIONS,
143                              SectionKind::getText());
144     ConstTextCoalSection
145       = Ctx->getMachOSection("__TEXT", "__const_coal",
146                              MachO::S_COALESCED,
147                              SectionKind::getReadOnly());
148     DataCoalSection = Ctx->getMachOSection(
149         "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
150   } else {
151     TextCoalSection = TextSection;
152     ConstTextCoalSection = ReadOnlySection;
153     DataCoalSection = DataSection;
154   }
155 
156   ConstDataSection  // .const_data
157     = Ctx->getMachOSection("__DATA", "__const", 0,
158                            SectionKind::getReadOnlyWithRel());
159   DataCommonSection
160     = Ctx->getMachOSection("__DATA","__common",
161                            MachO::S_ZEROFILL,
162                            SectionKind::getBSS());
163   DataBSSSection
164     = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
165                            SectionKind::getBSS());
166 
167 
168   LazySymbolPointerSection
169     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
170                            MachO::S_LAZY_SYMBOL_POINTERS,
171                            SectionKind::getMetadata());
172   NonLazySymbolPointerSection
173     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
174                            MachO::S_NON_LAZY_SYMBOL_POINTERS,
175                            SectionKind::getMetadata());
176 
177   ThreadLocalPointerSection
178     = Ctx->getMachOSection("__DATA", "__thread_ptr",
179                            MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
180                            SectionKind::getMetadata());
181 
182   // Exception Handling.
183   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
184                                      SectionKind::getReadOnlyWithRel());
185 
186   COFFDebugSymbolsSection = nullptr;
187   COFFDebugTypesSection = nullptr;
188 
189   if (useCompactUnwind(T)) {
190     CompactUnwindSection =
191         Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
192                              SectionKind::getReadOnly());
193 
194     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
195       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_X86_64_MODE_DWARF
196     else if (T.getArch() == Triple::aarch64)
197       CompactUnwindDwarfEHFrameOnly = 0x03000000;  // UNWIND_ARM64_MODE_DWARF
198     else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
199       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_ARM_MODE_DWARF
200   }
201 
202   // Debug Information.
203   DwarfAccelNamesSection =
204       Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
205                            SectionKind::getMetadata(), "names_begin");
206   DwarfAccelObjCSection =
207       Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
208                            SectionKind::getMetadata(), "objc_begin");
209   // 16 character section limit...
210   DwarfAccelNamespaceSection =
211       Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
212                            SectionKind::getMetadata(), "namespac_begin");
213   DwarfAccelTypesSection =
214       Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
215                            SectionKind::getMetadata(), "types_begin");
216 
217   DwarfAbbrevSection =
218       Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
219                            SectionKind::getMetadata(), "section_abbrev");
220   DwarfInfoSection =
221       Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
222                            SectionKind::getMetadata(), "section_info");
223   DwarfLineSection =
224       Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
225                            SectionKind::getMetadata(), "section_line");
226   DwarfFrameSection =
227       Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
228                            SectionKind::getMetadata());
229   DwarfPubNamesSection =
230       Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
231                            SectionKind::getMetadata());
232   DwarfPubTypesSection =
233       Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
234                            SectionKind::getMetadata());
235   DwarfGnuPubNamesSection =
236       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
237                            SectionKind::getMetadata());
238   DwarfGnuPubTypesSection =
239       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
240                            SectionKind::getMetadata());
241   DwarfStrSection =
242       Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
243                            SectionKind::getMetadata(), "info_string");
244   DwarfLocSection =
245       Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
246                            SectionKind::getMetadata(), "section_debug_loc");
247   DwarfARangesSection =
248       Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
249                            SectionKind::getMetadata());
250   DwarfRangesSection =
251       Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
252                            SectionKind::getMetadata(), "debug_range");
253   DwarfMacinfoSection =
254       Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
255                            SectionKind::getMetadata(), "debug_macinfo");
256   DwarfDebugInlineSection =
257       Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
258                            SectionKind::getMetadata());
259   DwarfCUIndexSection =
260       Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
261                            SectionKind::getMetadata());
262   DwarfTUIndexSection =
263       Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
264                            SectionKind::getMetadata());
265   StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
266                                          0, SectionKind::getMetadata());
267 
268   FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
269                                          0, SectionKind::getMetadata());
270 
271   TLSExtraDataSection = TLSTLVSection;
272 }
273 
274 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T) {
275   switch (T.getArch()) {
276   case Triple::mips:
277   case Triple::mipsel:
278     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
279     break;
280   case Triple::mips64:
281   case Triple::mips64el:
282     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
283     break;
284   case Triple::x86_64:
285     FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
286                      ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
287                                                     : dwarf::DW_EH_PE_sdata4);
288     break;
289   default:
290     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
291     break;
292   }
293 
294   switch (T.getArch()) {
295   case Triple::arm:
296   case Triple::armeb:
297   case Triple::thumb:
298   case Triple::thumbeb:
299     if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
300       break;
301     // Fallthrough if not using EHABI
302     LLVM_FALLTHROUGH;
303   case Triple::ppc:
304   case Triple::x86:
305     PersonalityEncoding = PositionIndependent
306                               ? dwarf::DW_EH_PE_indirect |
307                                     dwarf::DW_EH_PE_pcrel |
308                                     dwarf::DW_EH_PE_sdata4
309                               : dwarf::DW_EH_PE_absptr;
310     LSDAEncoding = PositionIndependent
311                        ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
312                        : dwarf::DW_EH_PE_absptr;
313     TTypeEncoding = PositionIndependent
314                         ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
315                               dwarf::DW_EH_PE_sdata4
316                         : dwarf::DW_EH_PE_absptr;
317     break;
318   case Triple::x86_64:
319     if (PositionIndependent) {
320       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
321         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
322          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
323       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
324         (CMModel == CodeModel::Small
325          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
326       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
327         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
328          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
329     } else {
330       PersonalityEncoding =
331         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
332         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
333       LSDAEncoding = (CMModel == CodeModel::Small)
334         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
335       TTypeEncoding = (CMModel == CodeModel::Small)
336         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
337     }
338     break;
339   case Triple::hexagon:
340     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
341     LSDAEncoding = dwarf::DW_EH_PE_absptr;
342     FDECFIEncoding = dwarf::DW_EH_PE_absptr;
343     TTypeEncoding = dwarf::DW_EH_PE_absptr;
344     if (PositionIndependent) {
345       PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
346       LSDAEncoding |= dwarf::DW_EH_PE_pcrel;
347       FDECFIEncoding |= dwarf::DW_EH_PE_pcrel;
348       TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
349     }
350     break;
351   case Triple::aarch64:
352   case Triple::aarch64_be:
353     // The small model guarantees static code/data size < 4GB, but not where it
354     // will be in memory. Most of these could end up >2GB away so even a signed
355     // pc-relative 32-bit address is insufficient, theoretically.
356     if (PositionIndependent) {
357       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
358         dwarf::DW_EH_PE_sdata8;
359       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
360       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
361         dwarf::DW_EH_PE_sdata8;
362     } else {
363       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
364       LSDAEncoding = dwarf::DW_EH_PE_absptr;
365       TTypeEncoding = dwarf::DW_EH_PE_absptr;
366     }
367     break;
368   case Triple::lanai:
369     LSDAEncoding = dwarf::DW_EH_PE_absptr;
370     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
371     TTypeEncoding = dwarf::DW_EH_PE_absptr;
372     break;
373   case Triple::mips:
374   case Triple::mipsel:
375   case Triple::mips64:
376   case Triple::mips64el:
377     // MIPS uses indirect pointer to refer personality functions and types, so
378     // that the eh_frame section can be read-only. DW.ref.personality will be
379     // generated for relocation.
380     PersonalityEncoding = dwarf::DW_EH_PE_indirect;
381     // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
382     //        identify N64 from just a triple.
383     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
384                     dwarf::DW_EH_PE_sdata4;
385     // We don't support PC-relative LSDA references in GAS so we use the default
386     // DW_EH_PE_absptr for those.
387 
388     // FreeBSD must be explicit about the data size and using pcrel since it's
389     // assembler/linker won't do the automatic conversion that the Linux tools
390     // do.
391     if (T.isOSFreeBSD()) {
392       PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
393       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
394     }
395     break;
396   case Triple::ppc64:
397   case Triple::ppc64le:
398     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
399       dwarf::DW_EH_PE_udata8;
400     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
401     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
402       dwarf::DW_EH_PE_udata8;
403     break;
404   case Triple::sparcel:
405   case Triple::sparc:
406     if (PositionIndependent) {
407       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
408       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
409         dwarf::DW_EH_PE_sdata4;
410       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
411         dwarf::DW_EH_PE_sdata4;
412     } else {
413       LSDAEncoding = dwarf::DW_EH_PE_absptr;
414       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
415       TTypeEncoding = dwarf::DW_EH_PE_absptr;
416     }
417     break;
418   case Triple::sparcv9:
419     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
420     if (PositionIndependent) {
421       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
422         dwarf::DW_EH_PE_sdata4;
423       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
424         dwarf::DW_EH_PE_sdata4;
425     } else {
426       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
427       TTypeEncoding = dwarf::DW_EH_PE_absptr;
428     }
429     break;
430   case Triple::systemz:
431     // All currently-defined code models guarantee that 4-byte PC-relative
432     // values will be in range.
433     if (PositionIndependent) {
434       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
435         dwarf::DW_EH_PE_sdata4;
436       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
437       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
438         dwarf::DW_EH_PE_sdata4;
439     } else {
440       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
441       LSDAEncoding = dwarf::DW_EH_PE_absptr;
442       TTypeEncoding = dwarf::DW_EH_PE_absptr;
443     }
444     break;
445   default:
446     break;
447   }
448 
449   unsigned EHSectionType = T.getArch() == Triple::x86_64
450                                ? ELF::SHT_X86_64_UNWIND
451                                : ELF::SHT_PROGBITS;
452 
453   // Solaris requires different flags for .eh_frame to seemingly every other
454   // platform.
455   unsigned EHSectionFlags = ELF::SHF_ALLOC;
456   if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
457     EHSectionFlags |= ELF::SHF_WRITE;
458 
459   // ELF
460   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
461                                   ELF::SHF_WRITE | ELF::SHF_ALLOC);
462 
463   TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
464                                    ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
465 
466   DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
467                                    ELF::SHF_WRITE | ELF::SHF_ALLOC);
468 
469   ReadOnlySection =
470       Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
471 
472   TLSDataSection =
473       Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
474                          ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
475 
476   TLSBSSSection = Ctx->getELFSection(
477       ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
478 
479   DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
480                                         ELF::SHF_ALLOC | ELF::SHF_WRITE);
481 
482   MergeableConst4Section =
483       Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
484                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
485 
486   MergeableConst8Section =
487       Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
488                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
489 
490   MergeableConst16Section =
491       Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
492                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
493 
494   MergeableConst32Section =
495       Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
496                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
497 
498   // Exception Handling Sections.
499 
500   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
501   // it contains relocatable pointers.  In PIC mode, this is probably a big
502   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
503   // adjusted or this should be a data section.
504   LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
505                                    ELF::SHF_ALLOC);
506 
507   COFFDebugSymbolsSection = nullptr;
508   COFFDebugTypesSection = nullptr;
509 
510   // Debug Info Sections.
511   DwarfAbbrevSection =
512       Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0);
513   DwarfInfoSection = Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0);
514   DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
515   DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
516   DwarfPubNamesSection =
517       Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
518   DwarfPubTypesSection =
519       Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
520   DwarfGnuPubNamesSection =
521       Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
522   DwarfGnuPubTypesSection =
523       Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
524   DwarfStrSection =
525       Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
526                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
527   DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
528   DwarfARangesSection =
529       Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
530   DwarfRangesSection =
531       Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0);
532   DwarfMacinfoSection =
533       Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0);
534 
535   // DWARF5 Experimental Debug Info
536 
537   // Accelerator Tables
538   DwarfAccelNamesSection =
539       Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0);
540   DwarfAccelObjCSection =
541       Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0);
542   DwarfAccelNamespaceSection =
543       Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0);
544   DwarfAccelTypesSection =
545       Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0);
546 
547   // Fission Sections
548   DwarfInfoDWOSection =
549       Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
550   DwarfTypesDWOSection =
551       Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
552   DwarfAbbrevDWOSection =
553       Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
554   DwarfStrDWOSection =
555       Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
556                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
557   DwarfLineDWOSection =
558       Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
559   DwarfLocDWOSection =
560       Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0);
561   DwarfStrOffDWOSection =
562       Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
563   DwarfAddrSection = Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0);
564 
565   // DWP Sections
566   DwarfCUIndexSection =
567       Ctx->getELFSection(".debug_cu_index", ELF::SHT_PROGBITS, 0);
568   DwarfTUIndexSection =
569       Ctx->getELFSection(".debug_tu_index", ELF::SHT_PROGBITS, 0);
570 
571   StackMapSection =
572       Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
573 
574   FaultMapSection =
575       Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
576 
577   EHFrameSection =
578       Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
579 }
580 
581 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
582   EHFrameSection = Ctx->getCOFFSection(
583       ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
584                        COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
585       SectionKind::getData());
586 
587   // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode.  This is
588   // used to indicate to the linker that the text segment contains thumb instructions
589   // and to set the ISA selection bit for calls accordingly.
590   const bool IsThumb = T.getArch() == Triple::thumb;
591 
592   CommDirectiveSupportsAlignment = true;
593 
594   // COFF
595   BSSSection = Ctx->getCOFFSection(
596       ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
597                   COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
598       SectionKind::getBSS());
599   TextSection = Ctx->getCOFFSection(
600       ".text",
601       (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
602           COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
603           COFF::IMAGE_SCN_MEM_READ,
604       SectionKind::getText());
605   DataSection = Ctx->getCOFFSection(
606       ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
607                    COFF::IMAGE_SCN_MEM_WRITE,
608       SectionKind::getData());
609   ReadOnlySection = Ctx->getCOFFSection(
610       ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
611       SectionKind::getReadOnly());
612 
613   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
614   // though it contains relocatable pointers.  In PIC mode, this is probably a
615   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
616   // adjusted or this should be a data section.
617   if (T.getArch() == Triple::x86_64) {
618     // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
619     LSDASection = nullptr;
620   } else {
621     LSDASection = Ctx->getCOFFSection(".gcc_except_table",
622                                       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
623                                           COFF::IMAGE_SCN_MEM_READ,
624                                       SectionKind::getReadOnly());
625   }
626 
627   // Debug info.
628   COFFDebugSymbolsSection =
629       Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
630                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
631                                        COFF::IMAGE_SCN_MEM_READ),
632                           SectionKind::getMetadata());
633   COFFDebugTypesSection =
634       Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
635                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
636                                        COFF::IMAGE_SCN_MEM_READ),
637                           SectionKind::getMetadata());
638 
639   DwarfAbbrevSection = Ctx->getCOFFSection(
640       ".debug_abbrev",
641       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
642           COFF::IMAGE_SCN_MEM_READ,
643       SectionKind::getMetadata(), "section_abbrev");
644   DwarfInfoSection = Ctx->getCOFFSection(
645       ".debug_info",
646       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
647           COFF::IMAGE_SCN_MEM_READ,
648       SectionKind::getMetadata(), "section_info");
649   DwarfLineSection = Ctx->getCOFFSection(
650       ".debug_line",
651       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
652           COFF::IMAGE_SCN_MEM_READ,
653       SectionKind::getMetadata(), "section_line");
654 
655   DwarfFrameSection = Ctx->getCOFFSection(
656       ".debug_frame",
657       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
658           COFF::IMAGE_SCN_MEM_READ,
659       SectionKind::getMetadata());
660   DwarfPubNamesSection = Ctx->getCOFFSection(
661       ".debug_pubnames",
662       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
663           COFF::IMAGE_SCN_MEM_READ,
664       SectionKind::getMetadata());
665   DwarfPubTypesSection = Ctx->getCOFFSection(
666       ".debug_pubtypes",
667       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
668           COFF::IMAGE_SCN_MEM_READ,
669       SectionKind::getMetadata());
670   DwarfGnuPubNamesSection = Ctx->getCOFFSection(
671       ".debug_gnu_pubnames",
672       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
673           COFF::IMAGE_SCN_MEM_READ,
674       SectionKind::getMetadata());
675   DwarfGnuPubTypesSection = Ctx->getCOFFSection(
676       ".debug_gnu_pubtypes",
677       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
678           COFF::IMAGE_SCN_MEM_READ,
679       SectionKind::getMetadata());
680   DwarfStrSection = Ctx->getCOFFSection(
681       ".debug_str",
682       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
683           COFF::IMAGE_SCN_MEM_READ,
684       SectionKind::getMetadata(), "info_string");
685   DwarfLocSection = Ctx->getCOFFSection(
686       ".debug_loc",
687       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
688           COFF::IMAGE_SCN_MEM_READ,
689       SectionKind::getMetadata(), "section_debug_loc");
690   DwarfARangesSection = Ctx->getCOFFSection(
691       ".debug_aranges",
692       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
693           COFF::IMAGE_SCN_MEM_READ,
694       SectionKind::getMetadata());
695   DwarfRangesSection = Ctx->getCOFFSection(
696       ".debug_ranges",
697       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
698           COFF::IMAGE_SCN_MEM_READ,
699       SectionKind::getMetadata(), "debug_range");
700   DwarfMacinfoSection = Ctx->getCOFFSection(
701       ".debug_macinfo",
702       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
703           COFF::IMAGE_SCN_MEM_READ,
704       SectionKind::getMetadata(), "debug_macinfo");
705   DwarfInfoDWOSection = Ctx->getCOFFSection(
706       ".debug_info.dwo",
707       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
708           COFF::IMAGE_SCN_MEM_READ,
709       SectionKind::getMetadata(), "section_info_dwo");
710   DwarfTypesDWOSection = Ctx->getCOFFSection(
711       ".debug_types.dwo",
712       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
713           COFF::IMAGE_SCN_MEM_READ,
714       SectionKind::getMetadata(), "section_types_dwo");
715   DwarfAbbrevDWOSection = Ctx->getCOFFSection(
716       ".debug_abbrev.dwo",
717       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
718           COFF::IMAGE_SCN_MEM_READ,
719       SectionKind::getMetadata(), "section_abbrev_dwo");
720   DwarfStrDWOSection = Ctx->getCOFFSection(
721       ".debug_str.dwo",
722       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
723           COFF::IMAGE_SCN_MEM_READ,
724       SectionKind::getMetadata(), "skel_string");
725   DwarfLineDWOSection = Ctx->getCOFFSection(
726       ".debug_line.dwo",
727       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
728           COFF::IMAGE_SCN_MEM_READ,
729       SectionKind::getMetadata());
730   DwarfLocDWOSection = Ctx->getCOFFSection(
731       ".debug_loc.dwo",
732       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
733           COFF::IMAGE_SCN_MEM_READ,
734       SectionKind::getMetadata(), "skel_loc");
735   DwarfStrOffDWOSection = Ctx->getCOFFSection(
736       ".debug_str_offsets.dwo",
737       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
738           COFF::IMAGE_SCN_MEM_READ,
739       SectionKind::getMetadata());
740   DwarfAddrSection = Ctx->getCOFFSection(
741       ".debug_addr",
742       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
743           COFF::IMAGE_SCN_MEM_READ,
744       SectionKind::getMetadata(), "addr_sec");
745   DwarfCUIndexSection = Ctx->getCOFFSection(
746       ".debug_cu_index",
747       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
748           COFF::IMAGE_SCN_MEM_READ,
749       SectionKind::getMetadata());
750   DwarfTUIndexSection = Ctx->getCOFFSection(
751       ".debug_tu_index",
752       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
753           COFF::IMAGE_SCN_MEM_READ,
754       SectionKind::getMetadata());
755   DwarfAccelNamesSection = Ctx->getCOFFSection(
756       ".apple_names",
757       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
758           COFF::IMAGE_SCN_MEM_READ,
759       SectionKind::getMetadata(), "names_begin");
760   DwarfAccelNamespaceSection = Ctx->getCOFFSection(
761       ".apple_namespaces",
762       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
763           COFF::IMAGE_SCN_MEM_READ,
764       SectionKind::getMetadata(), "namespac_begin");
765   DwarfAccelTypesSection = Ctx->getCOFFSection(
766       ".apple_types",
767       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
768           COFF::IMAGE_SCN_MEM_READ,
769       SectionKind::getMetadata(), "types_begin");
770   DwarfAccelObjCSection = Ctx->getCOFFSection(
771       ".apple_objc",
772       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
773           COFF::IMAGE_SCN_MEM_READ,
774       SectionKind::getMetadata(), "objc_begin");
775 
776   DrectveSection = Ctx->getCOFFSection(
777       ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
778       SectionKind::getMetadata());
779 
780   PDataSection = Ctx->getCOFFSection(
781       ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
782       SectionKind::getData());
783 
784   XDataSection = Ctx->getCOFFSection(
785       ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
786       SectionKind::getData());
787 
788   SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
789                                       SectionKind::getMetadata());
790 
791   TLSDataSection = Ctx->getCOFFSection(
792       ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
793                    COFF::IMAGE_SCN_MEM_WRITE,
794       SectionKind::getData());
795 
796   StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
797                                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
798                                             COFF::IMAGE_SCN_MEM_READ,
799                                         SectionKind::getReadOnly());
800 }
801 
802 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) {
803   // TODO: Set the section types and flags.
804   TextSection = Ctx->getWasmSection("", 0, 0);
805   DataSection = Ctx->getWasmSection("", 0, 0);
806 
807   // TODO: Set the section types and flags.
808   DwarfLineSection = Ctx->getWasmSection(".debug_line", 0, 0);
809   DwarfStrSection = Ctx->getWasmSection(".debug_str", 0, 0);
810   DwarfLocSection = Ctx->getWasmSection(".debug_loc", 0, 0);
811   DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", 0, 0, "section_abbrev");
812   DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", 0, 0);
813   DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", 0, 0, "debug_range");
814   DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", 0, 0, "debug_macinfo");
815   DwarfAddrSection = Ctx->getWasmSection(".debug_addr", 0, 0);
816   DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", 0, 0);
817   DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", 0, 0);
818   DwarfInfoSection = Ctx->getWasmSection(".debug_info", 0, 0, "section_info");
819   DwarfFrameSection = Ctx->getWasmSection(".debug_frame", 0, 0);
820   DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", 0, 0);
821   DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", 0, 0);
822 
823   // TODO: Define more sections.
824 }
825 
826 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
827                                             CodeModel::Model cm,
828                                             MCContext &ctx) {
829   PositionIndependent = PIC;
830   CMModel = cm;
831   Ctx = &ctx;
832 
833   // Common.
834   CommDirectiveSupportsAlignment = true;
835   SupportsWeakOmittedEHFrame = true;
836   SupportsCompactUnwindWithoutEHFrame = false;
837   OmitDwarfIfHaveCompactUnwind = false;
838 
839   PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
840       dwarf::DW_EH_PE_absptr;
841 
842   CompactUnwindDwarfEHFrameOnly = 0;
843 
844   EHFrameSection = nullptr;             // Created on demand.
845   CompactUnwindSection = nullptr;       // Used only by selected targets.
846   DwarfAccelNamesSection = nullptr;     // Used only by selected targets.
847   DwarfAccelObjCSection = nullptr;      // Used only by selected targets.
848   DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
849   DwarfAccelTypesSection = nullptr;     // Used only by selected targets.
850 
851   TT = TheTriple;
852 
853   switch (TT.getObjectFormat()) {
854   case Triple::MachO:
855     Env = IsMachO;
856     initMachOMCObjectFileInfo(TT);
857     break;
858   case Triple::COFF:
859     if (!TT.isOSWindows())
860       report_fatal_error(
861           "Cannot initialize MC for non-Windows COFF object files.");
862 
863     Env = IsCOFF;
864     initCOFFMCObjectFileInfo(TT);
865     break;
866   case Triple::ELF:
867     Env = IsELF;
868     initELFMCObjectFileInfo(TT);
869     break;
870   case Triple::Wasm:
871     Env = IsWasm;
872     initWasmMCObjectFileInfo(TT);
873     break;
874   case Triple::UnknownObjectFormat:
875     report_fatal_error("Cannot initialize MC for unknown object file format.");
876     break;
877   }
878 }
879 
880 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
881   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
882                             0, utostr(Hash));
883 }
884