1 //===-- MObjectFileInfo.cpp - Object File Information ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCObjectFileInfo.h"
11 #include "llvm/ADT/StringExtras.h"
12 #include "llvm/ADT/Triple.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCSection.h"
15 #include "llvm/MC/MCSectionCOFF.h"
16 #include "llvm/MC/MCSectionELF.h"
17 #include "llvm/MC/MCSectionMachO.h"
20 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
22 IsFunctionEHFrameSymbolPrivate = false;
23 SupportsWeakOmittedEHFrame = false;
25 if (T.isOSDarwin() && T.getArch() == Triple::arm64)
26 SupportsCompactUnwindWithoutEHFrame = true;
28 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
29 | dwarf::DW_EH_PE_sdata4;
30 LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
31 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
32 dwarf::DW_EH_PE_sdata4;
34 // .comm doesn't support alignment before Leopard.
35 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
36 CommDirectiveSupportsAlignment = false;
39 = Ctx->getMachOSection("__TEXT", "__text",
40 MachO::S_ATTR_PURE_INSTRUCTIONS,
41 SectionKind::getText());
43 = Ctx->getMachOSection("__DATA", "__data", 0,
44 SectionKind::getDataRel());
46 // BSSSection might not be expected initialized on msvc.
49 TLSDataSection // .tdata
50 = Ctx->getMachOSection("__DATA", "__thread_data",
51 MachO::S_THREAD_LOCAL_REGULAR,
52 SectionKind::getDataRel());
53 TLSBSSSection // .tbss
54 = Ctx->getMachOSection("__DATA", "__thread_bss",
55 MachO::S_THREAD_LOCAL_ZEROFILL,
56 SectionKind::getThreadBSS());
58 // TODO: Verify datarel below.
60 = Ctx->getMachOSection("__DATA", "__thread_vars",
61 MachO::S_THREAD_LOCAL_VARIABLES,
62 SectionKind::getDataRel());
65 = Ctx->getMachOSection("__DATA", "__thread_init",
66 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
67 SectionKind::getDataRel());
69 CStringSection // .cstring
70 = Ctx->getMachOSection("__TEXT", "__cstring",
71 MachO::S_CSTRING_LITERALS,
72 SectionKind::getMergeable1ByteCString());
74 = Ctx->getMachOSection("__TEXT","__ustring", 0,
75 SectionKind::getMergeable2ByteCString());
76 FourByteConstantSection // .literal4
77 = Ctx->getMachOSection("__TEXT", "__literal4",
78 MachO::S_4BYTE_LITERALS,
79 SectionKind::getMergeableConst4());
80 EightByteConstantSection // .literal8
81 = Ctx->getMachOSection("__TEXT", "__literal8",
82 MachO::S_8BYTE_LITERALS,
83 SectionKind::getMergeableConst8());
85 SixteenByteConstantSection // .literal16
86 = Ctx->getMachOSection("__TEXT", "__literal16",
87 MachO::S_16BYTE_LITERALS,
88 SectionKind::getMergeableConst16());
90 ReadOnlySection // .const
91 = Ctx->getMachOSection("__TEXT", "__const", 0,
92 SectionKind::getReadOnly());
95 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
97 MachO::S_ATTR_PURE_INSTRUCTIONS,
98 SectionKind::getText());
100 = Ctx->getMachOSection("__TEXT", "__const_coal",
102 SectionKind::getReadOnly());
103 ConstDataSection // .const_data
104 = Ctx->getMachOSection("__DATA", "__const", 0,
105 SectionKind::getReadOnlyWithRel());
107 = Ctx->getMachOSection("__DATA","__datacoal_nt",
109 SectionKind::getDataRel());
111 = Ctx->getMachOSection("__DATA","__common",
113 SectionKind::getBSS());
115 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
116 SectionKind::getBSS());
119 LazySymbolPointerSection
120 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
121 MachO::S_LAZY_SYMBOL_POINTERS,
122 SectionKind::getMetadata());
123 NonLazySymbolPointerSection
124 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
125 MachO::S_NON_LAZY_SYMBOL_POINTERS,
126 SectionKind::getMetadata());
128 if (RelocM == Reloc::Static) {
130 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
131 SectionKind::getDataRel());
133 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
134 SectionKind::getDataRel());
137 = Ctx->getMachOSection("__DATA", "__mod_init_func",
138 MachO::S_MOD_INIT_FUNC_POINTERS,
139 SectionKind::getDataRel());
141 = Ctx->getMachOSection("__DATA", "__mod_term_func",
142 MachO::S_MOD_TERM_FUNC_POINTERS,
143 SectionKind::getDataRel());
146 // Exception Handling.
147 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
148 SectionKind::getReadOnlyWithRel());
150 COFFDebugSymbolsSection = nullptr;
152 if ((T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) ||
153 (T.isOSDarwin() && T.getArch() == Triple::arm64)) {
154 CompactUnwindSection =
155 Ctx->getMachOSection("__LD", "__compact_unwind",
157 SectionKind::getReadOnly());
159 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
160 CompactUnwindDwarfEHFrameOnly = 0x04000000;
161 else if (T.getArch() == Triple::arm64)
162 CompactUnwindDwarfEHFrameOnly = 0x03000000;
165 // Debug Information.
166 DwarfAccelNamesSection =
167 Ctx->getMachOSection("__DWARF", "__apple_names",
169 SectionKind::getMetadata());
170 DwarfAccelObjCSection =
171 Ctx->getMachOSection("__DWARF", "__apple_objc",
173 SectionKind::getMetadata());
174 // 16 character section limit...
175 DwarfAccelNamespaceSection =
176 Ctx->getMachOSection("__DWARF", "__apple_namespac",
178 SectionKind::getMetadata());
179 DwarfAccelTypesSection =
180 Ctx->getMachOSection("__DWARF", "__apple_types",
182 SectionKind::getMetadata());
185 Ctx->getMachOSection("__DWARF", "__debug_abbrev",
187 SectionKind::getMetadata());
189 Ctx->getMachOSection("__DWARF", "__debug_info",
191 SectionKind::getMetadata());
193 Ctx->getMachOSection("__DWARF", "__debug_line",
195 SectionKind::getMetadata());
197 Ctx->getMachOSection("__DWARF", "__debug_frame",
199 SectionKind::getMetadata());
200 DwarfPubNamesSection =
201 Ctx->getMachOSection("__DWARF", "__debug_pubnames",
203 SectionKind::getMetadata());
204 DwarfPubTypesSection =
205 Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
207 SectionKind::getMetadata());
208 DwarfGnuPubNamesSection =
209 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
211 SectionKind::getMetadata());
212 DwarfGnuPubTypesSection =
213 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
215 SectionKind::getMetadata());
217 Ctx->getMachOSection("__DWARF", "__debug_str",
219 SectionKind::getMetadata());
221 Ctx->getMachOSection("__DWARF", "__debug_loc",
223 SectionKind::getMetadata());
224 DwarfARangesSection =
225 Ctx->getMachOSection("__DWARF", "__debug_aranges",
227 SectionKind::getMetadata());
229 Ctx->getMachOSection("__DWARF", "__debug_ranges",
231 SectionKind::getMetadata());
232 DwarfMacroInfoSection =
233 Ctx->getMachOSection("__DWARF", "__debug_macinfo",
235 SectionKind::getMetadata());
236 DwarfDebugInlineSection =
237 Ctx->getMachOSection("__DWARF", "__debug_inlined",
239 SectionKind::getMetadata());
241 Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
242 SectionKind::getMetadata());
244 TLSExtraDataSection = TLSTLVSection;
247 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
248 if (T.getArch() == Triple::mips ||
249 T.getArch() == Triple::mipsel)
250 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
251 else if (T.getArch() == Triple::mips64 ||
252 T.getArch() == Triple::mips64el)
253 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
255 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
257 if (T.getArch() == Triple::x86) {
258 PersonalityEncoding = (RelocM == Reloc::PIC_)
259 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
260 : dwarf::DW_EH_PE_absptr;
261 LSDAEncoding = (RelocM == Reloc::PIC_)
262 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
263 : dwarf::DW_EH_PE_absptr;
264 FDEEncoding = (RelocM == Reloc::PIC_)
265 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
266 : dwarf::DW_EH_PE_absptr;
267 TTypeEncoding = (RelocM == Reloc::PIC_)
268 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
269 : dwarf::DW_EH_PE_absptr;
270 } else if (T.getArch() == Triple::x86_64) {
271 if (RelocM == Reloc::PIC_) {
272 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
273 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
274 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
275 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
276 (CMModel == CodeModel::Small
277 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
278 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
279 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
280 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
281 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
283 PersonalityEncoding =
284 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
285 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
286 LSDAEncoding = (CMModel == CodeModel::Small)
287 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
288 FDEEncoding = dwarf::DW_EH_PE_udata4;
289 TTypeEncoding = (CMModel == CodeModel::Small)
290 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
292 } else if (T.getArch() == Triple::aarch64 ||
293 T.getArch() == Triple::aarch64_be ||
294 T.getArch() == Triple::arm64) {
295 // The small model guarantees static code/data size < 4GB, but not where it
296 // will be in memory. Most of these could end up >2GB away so even a signed
297 // pc-relative 32-bit address is insufficient, theoretically.
298 if (RelocM == Reloc::PIC_) {
299 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
300 dwarf::DW_EH_PE_sdata8;
301 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
302 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
303 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
304 dwarf::DW_EH_PE_sdata8;
306 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
307 LSDAEncoding = dwarf::DW_EH_PE_absptr;
308 FDEEncoding = dwarf::DW_EH_PE_udata4;
309 TTypeEncoding = dwarf::DW_EH_PE_absptr;
311 } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
312 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
313 dwarf::DW_EH_PE_udata8;
314 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
315 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
316 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
317 dwarf::DW_EH_PE_udata8;
318 } else if (T.getArch() == Triple::sparc) {
319 if (RelocM == Reloc::PIC_) {
320 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
321 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
322 dwarf::DW_EH_PE_sdata4;
323 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
324 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
325 dwarf::DW_EH_PE_sdata4;
327 LSDAEncoding = dwarf::DW_EH_PE_absptr;
328 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
329 FDEEncoding = dwarf::DW_EH_PE_udata4;
330 TTypeEncoding = dwarf::DW_EH_PE_absptr;
332 } else if (T.getArch() == Triple::sparcv9) {
333 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
334 if (RelocM == Reloc::PIC_) {
335 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
336 dwarf::DW_EH_PE_sdata4;
337 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
338 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
339 dwarf::DW_EH_PE_sdata4;
341 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
342 FDEEncoding = dwarf::DW_EH_PE_udata4;
343 TTypeEncoding = dwarf::DW_EH_PE_absptr;
345 } else if (T.getArch() == Triple::systemz) {
346 // All currently-defined code models guarantee that 4-byte PC-relative
347 // values will be in range.
348 if (RelocM == Reloc::PIC_) {
349 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
350 dwarf::DW_EH_PE_sdata4;
351 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
352 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
353 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
354 dwarf::DW_EH_PE_sdata4;
356 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
357 LSDAEncoding = dwarf::DW_EH_PE_absptr;
358 FDEEncoding = dwarf::DW_EH_PE_absptr;
359 TTypeEncoding = dwarf::DW_EH_PE_absptr;
363 // Solaris requires different flags for .eh_frame to seemingly every other
365 EHSectionType = ELF::SHT_PROGBITS;
366 EHSectionFlags = ELF::SHF_ALLOC;
367 if (T.getOS() == Triple::Solaris) {
368 if (T.getArch() == Triple::x86_64)
369 EHSectionType = ELF::SHT_X86_64_UNWIND;
371 EHSectionFlags |= ELF::SHF_WRITE;
377 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
378 ELF::SHF_WRITE | ELF::SHF_ALLOC,
379 SectionKind::getBSS());
382 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
385 SectionKind::getText());
388 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
389 ELF::SHF_WRITE |ELF::SHF_ALLOC,
390 SectionKind::getDataRel());
393 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
395 SectionKind::getReadOnly());
398 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
399 ELF::SHF_ALLOC | ELF::SHF_TLS |
401 SectionKind::getThreadData());
404 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
405 ELF::SHF_ALLOC | ELF::SHF_TLS |
407 SectionKind::getThreadBSS());
410 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
411 ELF::SHF_ALLOC |ELF::SHF_WRITE,
412 SectionKind::getDataRel());
414 DataRelLocalSection =
415 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
416 ELF::SHF_ALLOC |ELF::SHF_WRITE,
417 SectionKind::getDataRelLocal());
420 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
421 ELF::SHF_ALLOC |ELF::SHF_WRITE,
422 SectionKind::getReadOnlyWithRel());
424 DataRelROLocalSection =
425 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
426 ELF::SHF_ALLOC |ELF::SHF_WRITE,
427 SectionKind::getReadOnlyWithRelLocal());
429 MergeableConst4Section =
430 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
431 ELF::SHF_ALLOC |ELF::SHF_MERGE,
432 SectionKind::getMergeableConst4());
434 MergeableConst8Section =
435 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
436 ELF::SHF_ALLOC |ELF::SHF_MERGE,
437 SectionKind::getMergeableConst8());
439 MergeableConst16Section =
440 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
441 ELF::SHF_ALLOC |ELF::SHF_MERGE,
442 SectionKind::getMergeableConst16());
445 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
446 ELF::SHF_ALLOC |ELF::SHF_WRITE,
447 SectionKind::getDataRel());
450 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
451 ELF::SHF_ALLOC |ELF::SHF_WRITE,
452 SectionKind::getDataRel());
454 // Exception Handling Sections.
456 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
457 // it contains relocatable pointers. In PIC mode, this is probably a big
458 // runtime hit for C++ apps. Either the contents of the LSDA need to be
459 // adjusted or this should be a data section.
461 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
463 SectionKind::getReadOnly());
465 COFFDebugSymbolsSection = nullptr;
467 // Debug Info Sections.
469 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
470 SectionKind::getMetadata());
472 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
473 SectionKind::getMetadata());
475 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
476 SectionKind::getMetadata());
478 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
479 SectionKind::getMetadata());
480 DwarfPubNamesSection =
481 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
482 SectionKind::getMetadata());
483 DwarfPubTypesSection =
484 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
485 SectionKind::getMetadata());
486 DwarfGnuPubNamesSection =
487 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
488 SectionKind::getMetadata());
489 DwarfGnuPubTypesSection =
490 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
491 SectionKind::getMetadata());
493 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
494 ELF::SHF_MERGE | ELF::SHF_STRINGS,
495 SectionKind::getMergeable1ByteCString());
497 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
498 SectionKind::getMetadata());
499 DwarfARangesSection =
500 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
501 SectionKind::getMetadata());
503 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
504 SectionKind::getMetadata());
505 DwarfMacroInfoSection =
506 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
507 SectionKind::getMetadata());
509 // DWARF5 Experimental Debug Info
511 // Accelerator Tables
512 DwarfAccelNamesSection =
513 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
514 SectionKind::getMetadata());
515 DwarfAccelObjCSection =
516 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
517 SectionKind::getMetadata());
518 DwarfAccelNamespaceSection =
519 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
520 SectionKind::getMetadata());
521 DwarfAccelTypesSection =
522 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
523 SectionKind::getMetadata());
526 DwarfInfoDWOSection =
527 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
528 SectionKind::getMetadata());
529 DwarfAbbrevDWOSection =
530 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
531 SectionKind::getMetadata());
533 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
534 ELF::SHF_MERGE | ELF::SHF_STRINGS,
535 SectionKind::getMergeable1ByteCString());
536 DwarfLineDWOSection =
537 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
538 SectionKind::getMetadata());
540 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
541 SectionKind::getMetadata());
542 DwarfStrOffDWOSection =
543 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
544 SectionKind::getMetadata());
546 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
547 SectionKind::getMetadata());
551 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
552 // The object file format cannot represent common symbols with explicit
554 CommDirectiveSupportsAlignment = false;
558 Ctx->getCOFFSection(".bss",
559 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
560 COFF::IMAGE_SCN_MEM_READ |
561 COFF::IMAGE_SCN_MEM_WRITE,
562 SectionKind::getBSS());
564 Ctx->getCOFFSection(".text",
565 COFF::IMAGE_SCN_CNT_CODE |
566 COFF::IMAGE_SCN_MEM_EXECUTE |
567 COFF::IMAGE_SCN_MEM_READ,
568 SectionKind::getText());
570 Ctx->getCOFFSection(".data",
571 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
572 COFF::IMAGE_SCN_MEM_READ |
573 COFF::IMAGE_SCN_MEM_WRITE,
574 SectionKind::getDataRel());
576 Ctx->getCOFFSection(".rdata",
577 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
578 COFF::IMAGE_SCN_MEM_READ,
579 SectionKind::getReadOnly());
580 if (T.isKnownWindowsMSVCEnvironment()) {
582 Ctx->getCOFFSection(".CRT$XCU",
583 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
584 COFF::IMAGE_SCN_MEM_READ,
585 SectionKind::getReadOnly());
588 Ctx->getCOFFSection(".ctors",
589 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
590 COFF::IMAGE_SCN_MEM_READ |
591 COFF::IMAGE_SCN_MEM_WRITE,
592 SectionKind::getDataRel());
596 if (T.isKnownWindowsMSVCEnvironment()) {
598 Ctx->getCOFFSection(".CRT$XTX",
599 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
600 COFF::IMAGE_SCN_MEM_READ,
601 SectionKind::getReadOnly());
604 Ctx->getCOFFSection(".dtors",
605 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
606 COFF::IMAGE_SCN_MEM_READ |
607 COFF::IMAGE_SCN_MEM_WRITE,
608 SectionKind::getDataRel());
611 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
612 // though it contains relocatable pointers. In PIC mode, this is probably a
613 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
614 // adjusted or this should be a data section.
616 Ctx->getCOFFSection(".gcc_except_table",
617 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
618 COFF::IMAGE_SCN_MEM_READ,
619 SectionKind::getReadOnly());
622 COFFDebugSymbolsSection =
623 Ctx->getCOFFSection(".debug$S",
624 COFF::IMAGE_SCN_MEM_DISCARDABLE |
625 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
626 COFF::IMAGE_SCN_MEM_READ,
627 SectionKind::getMetadata());
630 Ctx->getCOFFSection(".debug_abbrev",
631 COFF::IMAGE_SCN_MEM_DISCARDABLE |
632 COFF::IMAGE_SCN_MEM_READ,
633 SectionKind::getMetadata());
635 Ctx->getCOFFSection(".debug_info",
636 COFF::IMAGE_SCN_MEM_DISCARDABLE |
637 COFF::IMAGE_SCN_MEM_READ,
638 SectionKind::getMetadata());
640 Ctx->getCOFFSection(".debug_line",
641 COFF::IMAGE_SCN_MEM_DISCARDABLE |
642 COFF::IMAGE_SCN_MEM_READ,
643 SectionKind::getMetadata());
645 Ctx->getCOFFSection(".debug_frame",
646 COFF::IMAGE_SCN_MEM_DISCARDABLE |
647 COFF::IMAGE_SCN_MEM_READ,
648 SectionKind::getMetadata());
649 DwarfPubNamesSection =
650 Ctx->getCOFFSection(".debug_pubnames",
651 COFF::IMAGE_SCN_MEM_DISCARDABLE |
652 COFF::IMAGE_SCN_MEM_READ,
653 SectionKind::getMetadata());
654 DwarfPubTypesSection =
655 Ctx->getCOFFSection(".debug_pubtypes",
656 COFF::IMAGE_SCN_MEM_DISCARDABLE |
657 COFF::IMAGE_SCN_MEM_READ,
658 SectionKind::getMetadata());
659 DwarfGnuPubNamesSection =
660 Ctx->getCOFFSection(".debug_gnu_pubnames",
661 COFF::IMAGE_SCN_MEM_DISCARDABLE |
662 COFF::IMAGE_SCN_MEM_READ,
663 SectionKind::getMetadata());
664 DwarfGnuPubTypesSection =
665 Ctx->getCOFFSection(".debug_gnu_pubtypes",
666 COFF::IMAGE_SCN_MEM_DISCARDABLE |
667 COFF::IMAGE_SCN_MEM_READ,
668 SectionKind::getMetadata());
670 Ctx->getCOFFSection(".debug_str",
671 COFF::IMAGE_SCN_MEM_DISCARDABLE |
672 COFF::IMAGE_SCN_MEM_READ,
673 SectionKind::getMetadata());
675 Ctx->getCOFFSection(".debug_loc",
676 COFF::IMAGE_SCN_MEM_DISCARDABLE |
677 COFF::IMAGE_SCN_MEM_READ,
678 SectionKind::getMetadata());
679 DwarfARangesSection =
680 Ctx->getCOFFSection(".debug_aranges",
681 COFF::IMAGE_SCN_MEM_DISCARDABLE |
682 COFF::IMAGE_SCN_MEM_READ,
683 SectionKind::getMetadata());
685 Ctx->getCOFFSection(".debug_ranges",
686 COFF::IMAGE_SCN_MEM_DISCARDABLE |
687 COFF::IMAGE_SCN_MEM_READ,
688 SectionKind::getMetadata());
689 DwarfMacroInfoSection =
690 Ctx->getCOFFSection(".debug_macinfo",
691 COFF::IMAGE_SCN_MEM_DISCARDABLE |
692 COFF::IMAGE_SCN_MEM_READ,
693 SectionKind::getMetadata());
694 DwarfInfoDWOSection =
695 Ctx->getCOFFSection(".debug_info.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
696 COFF::IMAGE_SCN_MEM_READ,
697 SectionKind::getMetadata());
698 DwarfAbbrevDWOSection =
699 Ctx->getCOFFSection(".debug_abbrev.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
700 COFF::IMAGE_SCN_MEM_READ,
701 SectionKind::getMetadata());
703 Ctx->getCOFFSection(".debug_str.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
704 COFF::IMAGE_SCN_MEM_READ,
705 SectionKind::getMetadata());
706 DwarfLineDWOSection =
707 Ctx->getCOFFSection(".debug_line.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
708 COFF::IMAGE_SCN_MEM_READ,
709 SectionKind::getMetadata());
711 Ctx->getCOFFSection(".debug_loc.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
712 COFF::IMAGE_SCN_MEM_READ,
713 SectionKind::getMetadata());
714 DwarfStrOffDWOSection =
715 Ctx->getCOFFSection(".debug_str_offsets.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
716 COFF::IMAGE_SCN_MEM_READ,
717 SectionKind::getMetadata());
718 DwarfAddrSection = Ctx->getCOFFSection(
719 ".debug_addr", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ,
720 SectionKind::getMetadata());
723 Ctx->getCOFFSection(".drectve",
724 COFF::IMAGE_SCN_LNK_INFO,
725 SectionKind::getMetadata());
728 Ctx->getCOFFSection(".pdata",
729 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
730 COFF::IMAGE_SCN_MEM_READ,
731 SectionKind::getDataRel());
734 Ctx->getCOFFSection(".xdata",
735 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
736 COFF::IMAGE_SCN_MEM_READ,
737 SectionKind::getDataRel());
739 Ctx->getCOFFSection(".tls$",
740 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
741 COFF::IMAGE_SCN_MEM_READ |
742 COFF::IMAGE_SCN_MEM_WRITE,
743 SectionKind::getDataRel());
746 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
754 CommDirectiveSupportsAlignment = true;
755 SupportsWeakOmittedEHFrame = true;
756 IsFunctionEHFrameSymbolPrivate = true;
757 SupportsCompactUnwindWithoutEHFrame = false;
759 PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
760 TTypeEncoding = dwarf::DW_EH_PE_absptr;
762 CompactUnwindDwarfEHFrameOnly = 0;
764 EHFrameSection = nullptr; // Created on demand.
765 CompactUnwindSection = nullptr; // Used only by selected targets.
766 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
767 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
768 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
769 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
772 Triple::ArchType Arch = T.getArch();
773 // FIXME: Checking for Arch here to filter out bogus triples such as
774 // cellspu-apple-darwin. Perhaps we should fix in Triple?
775 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
776 Arch == Triple::arm || Arch == Triple::thumb ||
777 Arch == Triple::arm64 ||
778 Arch == Triple::ppc || Arch == Triple::ppc64 ||
779 Arch == Triple::UnknownArch) &&
780 (T.isOSDarwin() || T.isOSBinFormatMachO())) {
782 InitMachOMCObjectFileInfo(T);
783 } else if (T.isOSWindows() && T.getObjectFormat() == Triple::COFF) {
784 assert((Arch == Triple::x86 || Arch == Triple::x86_64 ||
785 Arch == Triple::arm || Arch == Triple::thumb) &&
786 "unsupported Windows COFF architecture");
788 InitCOFFMCObjectFileInfo(T);
791 InitELFMCObjectFileInfo(T);
795 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
796 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
797 SectionKind::getMetadata(), 0, utostr(Hash));
801 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
802 return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS,
803 ELF::SHF_GROUP, SectionKind::getMetadata(), 0,
807 void MCObjectFileInfo::InitEHFrameSection() {
810 Ctx->getMachOSection("__TEXT", "__eh_frame",
812 MachO::S_ATTR_NO_TOC |
813 MachO::S_ATTR_STRIP_STATIC_SYMS |
814 MachO::S_ATTR_LIVE_SUPPORT,
815 SectionKind::getReadOnly());
816 else if (Env == IsELF)
818 Ctx->getELFSection(".eh_frame", EHSectionType,
820 SectionKind::getDataRel());
823 Ctx->getCOFFSection(".eh_frame",
824 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
825 COFF::IMAGE_SCN_MEM_READ |
826 COFF::IMAGE_SCN_MEM_WRITE,
827 SectionKind::getDataRel());