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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/Support/COFF.h"
20 
21 using namespace llvm;
22 
useCompactUnwind(const Triple & T)23 static bool useCompactUnwind(const Triple &T) {
24   // Only on darwin.
25   if (!T.isOSDarwin())
26     return false;
27 
28   // aarch64 always has it.
29   if (T.getArch() == Triple::aarch64)
30     return true;
31 
32   // armv7k always has it.
33   if (T.isWatchABI())
34     return true;
35 
36   // Use it on newer version of OS X.
37   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
38     return true;
39 
40   // And the iOS simulator.
41   if (T.isiOS() &&
42       (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
43     return true;
44 
45   return false;
46 }
47 
initMachOMCObjectFileInfo(const Triple & T)48 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
49   // MachO
50   SupportsWeakOmittedEHFrame = false;
51 
52   EHFrameSection = Ctx->getMachOSection(
53       "__TEXT", "__eh_frame",
54       MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
55           MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
56       SectionKind::getReadOnly());
57 
58   if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
59     SupportsCompactUnwindWithoutEHFrame = true;
60 
61   if (T.isWatchABI())
62     OmitDwarfIfHaveCompactUnwind = true;
63 
64   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
65     | dwarf::DW_EH_PE_sdata4;
66   LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
67   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
68     dwarf::DW_EH_PE_sdata4;
69 
70   // .comm doesn't support alignment before Leopard.
71   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
72     CommDirectiveSupportsAlignment = false;
73 
74   TextSection // .text
75     = Ctx->getMachOSection("__TEXT", "__text",
76                            MachO::S_ATTR_PURE_INSTRUCTIONS,
77                            SectionKind::getText());
78   DataSection // .data
79       = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData());
80 
81   // BSSSection might not be expected initialized on msvc.
82   BSSSection = nullptr;
83 
84   TLSDataSection // .tdata
85       = Ctx->getMachOSection("__DATA", "__thread_data",
86                              MachO::S_THREAD_LOCAL_REGULAR,
87                              SectionKind::getData());
88   TLSBSSSection // .tbss
89     = Ctx->getMachOSection("__DATA", "__thread_bss",
90                            MachO::S_THREAD_LOCAL_ZEROFILL,
91                            SectionKind::getThreadBSS());
92 
93   // TODO: Verify datarel below.
94   TLSTLVSection // .tlv
95       = Ctx->getMachOSection("__DATA", "__thread_vars",
96                              MachO::S_THREAD_LOCAL_VARIABLES,
97                              SectionKind::getData());
98 
99   TLSThreadInitSection = Ctx->getMachOSection(
100       "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
101       SectionKind::getData());
102 
103   CStringSection // .cstring
104     = Ctx->getMachOSection("__TEXT", "__cstring",
105                            MachO::S_CSTRING_LITERALS,
106                            SectionKind::getMergeable1ByteCString());
107   UStringSection
108     = Ctx->getMachOSection("__TEXT","__ustring", 0,
109                            SectionKind::getMergeable2ByteCString());
110   FourByteConstantSection // .literal4
111     = Ctx->getMachOSection("__TEXT", "__literal4",
112                            MachO::S_4BYTE_LITERALS,
113                            SectionKind::getMergeableConst4());
114   EightByteConstantSection // .literal8
115     = Ctx->getMachOSection("__TEXT", "__literal8",
116                            MachO::S_8BYTE_LITERALS,
117                            SectionKind::getMergeableConst8());
118 
119   SixteenByteConstantSection // .literal16
120       = Ctx->getMachOSection("__TEXT", "__literal16",
121                              MachO::S_16BYTE_LITERALS,
122                              SectionKind::getMergeableConst16());
123 
124   ReadOnlySection  // .const
125     = Ctx->getMachOSection("__TEXT", "__const", 0,
126                            SectionKind::getReadOnly());
127 
128   // If the target is not powerpc, map the coal sections to the non-coal
129   // sections.
130   //
131   // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
132   // "__TEXT/__const_coal"  => section "__TEXT/__const"
133   // "__DATA/__datacoal_nt" => section "__DATA/__data"
134   Triple::ArchType ArchTy = T.getArch();
135 
136   if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
137     TextCoalSection
138       = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
139                              MachO::S_COALESCED |
140                              MachO::S_ATTR_PURE_INSTRUCTIONS,
141                              SectionKind::getText());
142     ConstTextCoalSection
143       = Ctx->getMachOSection("__TEXT", "__const_coal",
144                              MachO::S_COALESCED,
145                              SectionKind::getReadOnly());
146     DataCoalSection = Ctx->getMachOSection(
147         "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
148   } else {
149     TextCoalSection = TextSection;
150     ConstTextCoalSection = ReadOnlySection;
151     DataCoalSection = DataSection;
152   }
153 
154   ConstDataSection  // .const_data
155     = Ctx->getMachOSection("__DATA", "__const", 0,
156                            SectionKind::getReadOnlyWithRel());
157   DataCommonSection
158     = Ctx->getMachOSection("__DATA","__common",
159                            MachO::S_ZEROFILL,
160                            SectionKind::getBSS());
161   DataBSSSection
162     = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
163                            SectionKind::getBSS());
164 
165 
166   LazySymbolPointerSection
167     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
168                            MachO::S_LAZY_SYMBOL_POINTERS,
169                            SectionKind::getMetadata());
170   NonLazySymbolPointerSection
171     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
172                            MachO::S_NON_LAZY_SYMBOL_POINTERS,
173                            SectionKind::getMetadata());
174 
175   ThreadLocalPointerSection
176     = Ctx->getMachOSection("__DATA", "__thread_ptr",
177                            MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
178                            SectionKind::getMetadata());
179 
180   if (!PositionIndependent) {
181     StaticCtorSection = Ctx->getMachOSection("__TEXT", "__constructor", 0,
182                                              SectionKind::getData());
183     StaticDtorSection = Ctx->getMachOSection("__TEXT", "__destructor", 0,
184                                              SectionKind::getData());
185   } else {
186     StaticCtorSection = Ctx->getMachOSection("__DATA", "__mod_init_func",
187                                              MachO::S_MOD_INIT_FUNC_POINTERS,
188                                              SectionKind::getData());
189     StaticDtorSection = Ctx->getMachOSection("__DATA", "__mod_term_func",
190                                              MachO::S_MOD_TERM_FUNC_POINTERS,
191                                              SectionKind::getData());
192   }
193 
194   // Exception Handling.
195   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
196                                      SectionKind::getReadOnlyWithRel());
197 
198   COFFDebugSymbolsSection = nullptr;
199   COFFDebugTypesSection = nullptr;
200 
201   if (useCompactUnwind(T)) {
202     CompactUnwindSection =
203         Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
204                              SectionKind::getReadOnly());
205 
206     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
207       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_X86_64_MODE_DWARF
208     else if (T.getArch() == Triple::aarch64)
209       CompactUnwindDwarfEHFrameOnly = 0x03000000;  // UNWIND_ARM64_MODE_DWARF
210     else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
211       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_ARM_MODE_DWARF
212   }
213 
214   // Debug Information.
215   DwarfAccelNamesSection =
216       Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
217                            SectionKind::getMetadata(), "names_begin");
218   DwarfAccelObjCSection =
219       Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
220                            SectionKind::getMetadata(), "objc_begin");
221   // 16 character section limit...
222   DwarfAccelNamespaceSection =
223       Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
224                            SectionKind::getMetadata(), "namespac_begin");
225   DwarfAccelTypesSection =
226       Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
227                            SectionKind::getMetadata(), "types_begin");
228 
229   DwarfAbbrevSection =
230       Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
231                            SectionKind::getMetadata(), "section_abbrev");
232   DwarfInfoSection =
233       Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
234                            SectionKind::getMetadata(), "section_info");
235   DwarfLineSection =
236       Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
237                            SectionKind::getMetadata(), "section_line");
238   DwarfFrameSection =
239       Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
240                            SectionKind::getMetadata());
241   DwarfPubNamesSection =
242       Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
243                            SectionKind::getMetadata());
244   DwarfPubTypesSection =
245       Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
246                            SectionKind::getMetadata());
247   DwarfGnuPubNamesSection =
248       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
249                            SectionKind::getMetadata());
250   DwarfGnuPubTypesSection =
251       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
252                            SectionKind::getMetadata());
253   DwarfStrSection =
254       Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
255                            SectionKind::getMetadata(), "info_string");
256   DwarfLocSection =
257       Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
258                            SectionKind::getMetadata(), "section_debug_loc");
259   DwarfARangesSection =
260       Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
261                            SectionKind::getMetadata());
262   DwarfRangesSection =
263       Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
264                            SectionKind::getMetadata(), "debug_range");
265   DwarfMacinfoSection =
266       Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
267                            SectionKind::getMetadata(), "debug_macinfo");
268   DwarfDebugInlineSection =
269       Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
270                            SectionKind::getMetadata());
271   DwarfCUIndexSection =
272       Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
273                            SectionKind::getMetadata());
274   DwarfTUIndexSection =
275       Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
276                            SectionKind::getMetadata());
277   StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
278                                          0, SectionKind::getMetadata());
279 
280   FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
281                                          0, SectionKind::getMetadata());
282 
283   TLSExtraDataSection = TLSTLVSection;
284 }
285 
initELFMCObjectFileInfo(const Triple & T)286 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T) {
287   switch (T.getArch()) {
288   case Triple::mips:
289   case Triple::mipsel:
290     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
291     break;
292   case Triple::mips64:
293   case Triple::mips64el:
294     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
295     break;
296   case Triple::x86_64:
297     FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
298                      ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
299                                                     : dwarf::DW_EH_PE_sdata4);
300     break;
301   default:
302     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
303     break;
304   }
305 
306   switch (T.getArch()) {
307   case Triple::arm:
308   case Triple::armeb:
309   case Triple::thumb:
310   case Triple::thumbeb:
311     if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
312       break;
313     // Fallthrough if not using EHABI
314   case Triple::ppc:
315   case Triple::x86:
316     PersonalityEncoding = PositionIndependent
317                               ? dwarf::DW_EH_PE_indirect |
318                                     dwarf::DW_EH_PE_pcrel |
319                                     dwarf::DW_EH_PE_sdata4
320                               : dwarf::DW_EH_PE_absptr;
321     LSDAEncoding = PositionIndependent
322                        ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
323                        : dwarf::DW_EH_PE_absptr;
324     TTypeEncoding = PositionIndependent
325                         ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
326                               dwarf::DW_EH_PE_sdata4
327                         : dwarf::DW_EH_PE_absptr;
328     break;
329   case Triple::x86_64:
330     if (PositionIndependent) {
331       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
332         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
333          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
334       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
335         (CMModel == CodeModel::Small
336          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
337       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
338         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
339          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
340     } else {
341       PersonalityEncoding =
342         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
343         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
344       LSDAEncoding = (CMModel == CodeModel::Small)
345         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
346       TTypeEncoding = (CMModel == CodeModel::Small)
347         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
348     }
349     break;
350   case Triple::hexagon:
351     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
352     LSDAEncoding = dwarf::DW_EH_PE_absptr;
353     FDECFIEncoding = dwarf::DW_EH_PE_absptr;
354     TTypeEncoding = dwarf::DW_EH_PE_absptr;
355     if (PositionIndependent) {
356       PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
357       LSDAEncoding |= dwarf::DW_EH_PE_pcrel;
358       FDECFIEncoding |= dwarf::DW_EH_PE_pcrel;
359       TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
360     }
361     break;
362   case Triple::aarch64:
363   case Triple::aarch64_be:
364     // The small model guarantees static code/data size < 4GB, but not where it
365     // will be in memory. Most of these could end up >2GB away so even a signed
366     // pc-relative 32-bit address is insufficient, theoretically.
367     if (PositionIndependent) {
368       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
369         dwarf::DW_EH_PE_sdata8;
370       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
371       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
372         dwarf::DW_EH_PE_sdata8;
373     } else {
374       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
375       LSDAEncoding = dwarf::DW_EH_PE_absptr;
376       TTypeEncoding = dwarf::DW_EH_PE_absptr;
377     }
378     break;
379   case Triple::lanai:
380     LSDAEncoding = dwarf::DW_EH_PE_absptr;
381     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
382     TTypeEncoding = dwarf::DW_EH_PE_absptr;
383     break;
384   case Triple::mips:
385   case Triple::mipsel:
386   case Triple::mips64:
387   case Triple::mips64el:
388     // MIPS uses indirect pointer to refer personality functions and types, so
389     // that the eh_frame section can be read-only. DW.ref.personality will be
390     // generated for relocation.
391     PersonalityEncoding = dwarf::DW_EH_PE_indirect;
392     // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
393     //        identify N64 from just a triple.
394     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
395                     dwarf::DW_EH_PE_sdata4;
396     // We don't support PC-relative LSDA references in GAS so we use the default
397     // DW_EH_PE_absptr for those.
398     break;
399   case Triple::ppc64:
400   case Triple::ppc64le:
401     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
402       dwarf::DW_EH_PE_udata8;
403     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
404     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
405       dwarf::DW_EH_PE_udata8;
406     break;
407   case Triple::sparcel:
408   case Triple::sparc:
409     if (PositionIndependent) {
410       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
411       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
412         dwarf::DW_EH_PE_sdata4;
413       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
414         dwarf::DW_EH_PE_sdata4;
415     } else {
416       LSDAEncoding = dwarf::DW_EH_PE_absptr;
417       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
418       TTypeEncoding = dwarf::DW_EH_PE_absptr;
419     }
420     break;
421   case Triple::sparcv9:
422     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
423     if (PositionIndependent) {
424       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
425         dwarf::DW_EH_PE_sdata4;
426       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
427         dwarf::DW_EH_PE_sdata4;
428     } else {
429       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
430       TTypeEncoding = dwarf::DW_EH_PE_absptr;
431     }
432     break;
433   case Triple::systemz:
434     // All currently-defined code models guarantee that 4-byte PC-relative
435     // values will be in range.
436     if (PositionIndependent) {
437       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
438         dwarf::DW_EH_PE_sdata4;
439       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
440       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
441         dwarf::DW_EH_PE_sdata4;
442     } else {
443       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
444       LSDAEncoding = dwarf::DW_EH_PE_absptr;
445       TTypeEncoding = dwarf::DW_EH_PE_absptr;
446     }
447     break;
448   default:
449     break;
450   }
451 
452   unsigned EHSectionType = T.getArch() == Triple::x86_64
453                                ? ELF::SHT_X86_64_UNWIND
454                                : ELF::SHT_PROGBITS;
455 
456   // Solaris requires different flags for .eh_frame to seemingly every other
457   // platform.
458   unsigned EHSectionFlags = ELF::SHF_ALLOC;
459   if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
460     EHSectionFlags |= ELF::SHF_WRITE;
461 
462   // ELF
463   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
464                                   ELF::SHF_WRITE | ELF::SHF_ALLOC);
465 
466   TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
467                                    ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
468 
469   DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
470                                    ELF::SHF_WRITE | ELF::SHF_ALLOC);
471 
472   ReadOnlySection =
473       Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
474 
475   TLSDataSection =
476       Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
477                          ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
478 
479   TLSBSSSection = Ctx->getELFSection(
480       ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
481 
482   DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
483                                         ELF::SHF_ALLOC | ELF::SHF_WRITE);
484 
485   MergeableConst4Section =
486       Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
487                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
488 
489   MergeableConst8Section =
490       Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
491                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
492 
493   MergeableConst16Section =
494       Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
495                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
496 
497   MergeableConst32Section =
498       Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
499                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
500 
501   StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
502                                          ELF::SHF_ALLOC | ELF::SHF_WRITE);
503 
504   StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
505                                          ELF::SHF_ALLOC | ELF::SHF_WRITE);
506 
507   // Exception Handling Sections.
508 
509   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
510   // it contains relocatable pointers.  In PIC mode, this is probably a big
511   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
512   // adjusted or this should be a data section.
513   LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
514                                    ELF::SHF_ALLOC);
515 
516   COFFDebugSymbolsSection = nullptr;
517   COFFDebugTypesSection = nullptr;
518 
519   // Debug Info Sections.
520   DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
521                                           "section_abbrev");
522   DwarfInfoSection =
523       Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
524   DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
525   DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
526   DwarfPubNamesSection =
527       Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
528   DwarfPubTypesSection =
529       Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
530   DwarfGnuPubNamesSection =
531       Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
532   DwarfGnuPubTypesSection =
533       Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
534   DwarfStrSection =
535       Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
536                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
537   DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
538   DwarfARangesSection =
539       Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
540   DwarfRangesSection =
541       Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
542   DwarfMacinfoSection = Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS,
543                                            0, "debug_macinfo");
544 
545   // DWARF5 Experimental Debug Info
546 
547   // Accelerator Tables
548   DwarfAccelNamesSection =
549       Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
550   DwarfAccelObjCSection =
551       Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
552   DwarfAccelNamespaceSection = Ctx->getELFSection(
553       ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
554   DwarfAccelTypesSection =
555       Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
556 
557   // Fission Sections
558   DwarfInfoDWOSection =
559       Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
560   DwarfTypesDWOSection =
561       Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
562   DwarfAbbrevDWOSection =
563       Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
564   DwarfStrDWOSection =
565       Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
566                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
567   DwarfLineDWOSection =
568       Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
569   DwarfLocDWOSection =
570       Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
571   DwarfStrOffDWOSection =
572       Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
573   DwarfAddrSection =
574       Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
575 
576   // DWP Sections
577   DwarfCUIndexSection =
578       Ctx->getELFSection(".debug_cu_index", ELF::SHT_PROGBITS, 0);
579   DwarfTUIndexSection =
580       Ctx->getELFSection(".debug_tu_index", ELF::SHT_PROGBITS, 0);
581 
582   StackMapSection =
583       Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
584 
585   FaultMapSection =
586       Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
587 
588   EHFrameSection =
589       Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
590 }
591 
initCOFFMCObjectFileInfo(const Triple & T)592 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
593   EHFrameSection = Ctx->getCOFFSection(
594       ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
595                        COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
596       SectionKind::getData());
597 
598   // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode.  This is
599   // used to indicate to the linker that the text segment contains thumb instructions
600   // and to set the ISA selection bit for calls accordingly.
601   const bool IsThumb = T.getArch() == Triple::thumb;
602 
603   CommDirectiveSupportsAlignment = true;
604 
605   // COFF
606   BSSSection = Ctx->getCOFFSection(
607       ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
608                   COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
609       SectionKind::getBSS());
610   TextSection = Ctx->getCOFFSection(
611       ".text",
612       (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
613           COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
614           COFF::IMAGE_SCN_MEM_READ,
615       SectionKind::getText());
616   DataSection = Ctx->getCOFFSection(
617       ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
618                    COFF::IMAGE_SCN_MEM_WRITE,
619       SectionKind::getData());
620   ReadOnlySection = Ctx->getCOFFSection(
621       ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
622       SectionKind::getReadOnly());
623 
624   if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
625     StaticCtorSection =
626         Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
627                                             COFF::IMAGE_SCN_MEM_READ,
628                             SectionKind::getReadOnly());
629     StaticDtorSection =
630         Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
631                                             COFF::IMAGE_SCN_MEM_READ,
632                             SectionKind::getReadOnly());
633   } else {
634     StaticCtorSection = Ctx->getCOFFSection(
635         ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
636                       COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
637         SectionKind::getData());
638     StaticDtorSection = Ctx->getCOFFSection(
639         ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
640                       COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
641         SectionKind::getData());
642   }
643 
644   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
645   // though it contains relocatable pointers.  In PIC mode, this is probably a
646   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
647   // adjusted or this should be a data section.
648   if (T.getArch() == Triple::x86_64) {
649     // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
650     LSDASection = nullptr;
651   } else {
652     LSDASection = Ctx->getCOFFSection(".gcc_except_table",
653                                       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
654                                           COFF::IMAGE_SCN_MEM_READ,
655                                       SectionKind::getReadOnly());
656   }
657 
658   // Debug info.
659   COFFDebugSymbolsSection =
660       Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
661                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
662                                        COFF::IMAGE_SCN_MEM_READ),
663                           SectionKind::getMetadata());
664   COFFDebugTypesSection =
665       Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
666                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
667                                        COFF::IMAGE_SCN_MEM_READ),
668                           SectionKind::getMetadata());
669 
670   DwarfAbbrevSection = Ctx->getCOFFSection(
671       ".debug_abbrev",
672       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
673           COFF::IMAGE_SCN_MEM_READ,
674       SectionKind::getMetadata(), "section_abbrev");
675   DwarfInfoSection = Ctx->getCOFFSection(
676       ".debug_info",
677       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
678           COFF::IMAGE_SCN_MEM_READ,
679       SectionKind::getMetadata(), "section_info");
680   DwarfLineSection = Ctx->getCOFFSection(
681       ".debug_line",
682       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
683           COFF::IMAGE_SCN_MEM_READ,
684       SectionKind::getMetadata(), "section_line");
685 
686   DwarfFrameSection = Ctx->getCOFFSection(
687       ".debug_frame",
688       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
689           COFF::IMAGE_SCN_MEM_READ,
690       SectionKind::getMetadata());
691   DwarfPubNamesSection = Ctx->getCOFFSection(
692       ".debug_pubnames",
693       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
694           COFF::IMAGE_SCN_MEM_READ,
695       SectionKind::getMetadata());
696   DwarfPubTypesSection = Ctx->getCOFFSection(
697       ".debug_pubtypes",
698       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
699           COFF::IMAGE_SCN_MEM_READ,
700       SectionKind::getMetadata());
701   DwarfGnuPubNamesSection = Ctx->getCOFFSection(
702       ".debug_gnu_pubnames",
703       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
704           COFF::IMAGE_SCN_MEM_READ,
705       SectionKind::getMetadata());
706   DwarfGnuPubTypesSection = Ctx->getCOFFSection(
707       ".debug_gnu_pubtypes",
708       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
709           COFF::IMAGE_SCN_MEM_READ,
710       SectionKind::getMetadata());
711   DwarfStrSection = Ctx->getCOFFSection(
712       ".debug_str",
713       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
714           COFF::IMAGE_SCN_MEM_READ,
715       SectionKind::getMetadata(), "info_string");
716   DwarfLocSection = Ctx->getCOFFSection(
717       ".debug_loc",
718       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
719           COFF::IMAGE_SCN_MEM_READ,
720       SectionKind::getMetadata(), "section_debug_loc");
721   DwarfARangesSection = Ctx->getCOFFSection(
722       ".debug_aranges",
723       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
724           COFF::IMAGE_SCN_MEM_READ,
725       SectionKind::getMetadata());
726   DwarfRangesSection = Ctx->getCOFFSection(
727       ".debug_ranges",
728       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
729           COFF::IMAGE_SCN_MEM_READ,
730       SectionKind::getMetadata(), "debug_range");
731   DwarfMacinfoSection = Ctx->getCOFFSection(
732       ".debug_macinfo",
733       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
734           COFF::IMAGE_SCN_MEM_READ,
735       SectionKind::getMetadata(), "debug_macinfo");
736   DwarfInfoDWOSection = Ctx->getCOFFSection(
737       ".debug_info.dwo",
738       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
739           COFF::IMAGE_SCN_MEM_READ,
740       SectionKind::getMetadata(), "section_info_dwo");
741   DwarfTypesDWOSection = Ctx->getCOFFSection(
742       ".debug_types.dwo",
743       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
744           COFF::IMAGE_SCN_MEM_READ,
745       SectionKind::getMetadata(), "section_types_dwo");
746   DwarfAbbrevDWOSection = Ctx->getCOFFSection(
747       ".debug_abbrev.dwo",
748       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
749           COFF::IMAGE_SCN_MEM_READ,
750       SectionKind::getMetadata(), "section_abbrev_dwo");
751   DwarfStrDWOSection = Ctx->getCOFFSection(
752       ".debug_str.dwo",
753       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
754           COFF::IMAGE_SCN_MEM_READ,
755       SectionKind::getMetadata(), "skel_string");
756   DwarfLineDWOSection = Ctx->getCOFFSection(
757       ".debug_line.dwo",
758       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
759           COFF::IMAGE_SCN_MEM_READ,
760       SectionKind::getMetadata());
761   DwarfLocDWOSection = Ctx->getCOFFSection(
762       ".debug_loc.dwo",
763       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
764           COFF::IMAGE_SCN_MEM_READ,
765       SectionKind::getMetadata(), "skel_loc");
766   DwarfStrOffDWOSection = Ctx->getCOFFSection(
767       ".debug_str_offsets.dwo",
768       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
769           COFF::IMAGE_SCN_MEM_READ,
770       SectionKind::getMetadata());
771   DwarfAddrSection = Ctx->getCOFFSection(
772       ".debug_addr",
773       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
774           COFF::IMAGE_SCN_MEM_READ,
775       SectionKind::getMetadata(), "addr_sec");
776   DwarfCUIndexSection = Ctx->getCOFFSection(
777       ".debug_cu_index",
778       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
779           COFF::IMAGE_SCN_MEM_READ,
780       SectionKind::getMetadata());
781   DwarfTUIndexSection = Ctx->getCOFFSection(
782       ".debug_tu_index",
783       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
784           COFF::IMAGE_SCN_MEM_READ,
785       SectionKind::getMetadata());
786   DwarfAccelNamesSection = Ctx->getCOFFSection(
787       ".apple_names",
788       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
789           COFF::IMAGE_SCN_MEM_READ,
790       SectionKind::getMetadata(), "names_begin");
791   DwarfAccelNamespaceSection = Ctx->getCOFFSection(
792       ".apple_namespaces",
793       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
794           COFF::IMAGE_SCN_MEM_READ,
795       SectionKind::getMetadata(), "namespac_begin");
796   DwarfAccelTypesSection = Ctx->getCOFFSection(
797       ".apple_types",
798       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
799           COFF::IMAGE_SCN_MEM_READ,
800       SectionKind::getMetadata(), "types_begin");
801   DwarfAccelObjCSection = Ctx->getCOFFSection(
802       ".apple_objc",
803       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
804           COFF::IMAGE_SCN_MEM_READ,
805       SectionKind::getMetadata(), "objc_begin");
806 
807   DrectveSection = Ctx->getCOFFSection(
808       ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
809       SectionKind::getMetadata());
810 
811   PDataSection = Ctx->getCOFFSection(
812       ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
813       SectionKind::getData());
814 
815   XDataSection = Ctx->getCOFFSection(
816       ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
817       SectionKind::getData());
818 
819   SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
820                                       SectionKind::getMetadata());
821 
822   TLSDataSection = Ctx->getCOFFSection(
823       ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
824                    COFF::IMAGE_SCN_MEM_WRITE,
825       SectionKind::getData());
826 
827   StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
828                                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
829                                             COFF::IMAGE_SCN_MEM_READ,
830                                         SectionKind::getReadOnly());
831 }
832 
InitMCObjectFileInfo(const Triple & TheTriple,bool PIC,CodeModel::Model cm,MCContext & ctx)833 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
834                                             CodeModel::Model cm,
835                                             MCContext &ctx) {
836   PositionIndependent = PIC;
837   CMModel = cm;
838   Ctx = &ctx;
839 
840   // Common.
841   CommDirectiveSupportsAlignment = true;
842   SupportsWeakOmittedEHFrame = true;
843   SupportsCompactUnwindWithoutEHFrame = false;
844   OmitDwarfIfHaveCompactUnwind = false;
845 
846   PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
847       dwarf::DW_EH_PE_absptr;
848 
849   CompactUnwindDwarfEHFrameOnly = 0;
850 
851   EHFrameSection = nullptr;             // Created on demand.
852   CompactUnwindSection = nullptr;       // Used only by selected targets.
853   DwarfAccelNamesSection = nullptr;     // Used only by selected targets.
854   DwarfAccelObjCSection = nullptr;      // Used only by selected targets.
855   DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
856   DwarfAccelTypesSection = nullptr;     // Used only by selected targets.
857 
858   TT = TheTriple;
859 
860   switch (TT.getObjectFormat()) {
861   case Triple::MachO:
862     Env = IsMachO;
863     initMachOMCObjectFileInfo(TT);
864     break;
865   case Triple::COFF:
866     if (!TT.isOSWindows())
867       report_fatal_error(
868           "Cannot initialize MC for non-Windows COFF object files.");
869 
870     Env = IsCOFF;
871     initCOFFMCObjectFileInfo(TT);
872     break;
873   case Triple::ELF:
874     Env = IsELF;
875     initELFMCObjectFileInfo(TT);
876     break;
877   case Triple::UnknownObjectFormat:
878     report_fatal_error("Cannot initialize MC for unknown object file format.");
879     break;
880   }
881 }
882 
getDwarfTypesSection(uint64_t Hash) const883 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
884   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
885                             0, utostr(Hash));
886 }
887