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 switch (T.getArch()) {
251 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
254 case Triple::mips64el:
255 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
258 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
262 switch (T.getArch()) {
264 PersonalityEncoding = (RelocM == Reloc::PIC_)
265 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
266 : dwarf::DW_EH_PE_absptr;
267 LSDAEncoding = (RelocM == Reloc::PIC_)
268 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
269 : dwarf::DW_EH_PE_absptr;
270 FDEEncoding = (RelocM == Reloc::PIC_)
271 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
272 : dwarf::DW_EH_PE_absptr;
273 TTypeEncoding = (RelocM == Reloc::PIC_)
274 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
275 : dwarf::DW_EH_PE_absptr;
278 if (RelocM == Reloc::PIC_) {
279 PersonalityEncoding = 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);
282 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
283 (CMModel == CodeModel::Small
284 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
285 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
286 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
287 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
288 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
290 PersonalityEncoding =
291 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
292 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
293 LSDAEncoding = (CMModel == CodeModel::Small)
294 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
295 FDEEncoding = dwarf::DW_EH_PE_udata4;
296 TTypeEncoding = (CMModel == CodeModel::Small)
297 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
300 case Triple::aarch64:
301 case Triple::aarch64_be:
303 case Triple::arm64_be:
304 // The small model guarantees static code/data size < 4GB, but not where it
305 // will be in memory. Most of these could end up >2GB away so even a signed
306 // pc-relative 32-bit address is insufficient, theoretically.
307 if (RelocM == Reloc::PIC_) {
308 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
309 dwarf::DW_EH_PE_sdata8;
310 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
311 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
312 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
313 dwarf::DW_EH_PE_sdata8;
315 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
316 LSDAEncoding = dwarf::DW_EH_PE_absptr;
317 FDEEncoding = dwarf::DW_EH_PE_udata4;
318 TTypeEncoding = dwarf::DW_EH_PE_absptr;
322 case Triple::ppc64le:
323 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
324 dwarf::DW_EH_PE_udata8;
325 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
326 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
327 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
328 dwarf::DW_EH_PE_udata8;
331 if (RelocM == Reloc::PIC_) {
332 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
333 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
334 dwarf::DW_EH_PE_sdata4;
335 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
336 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
337 dwarf::DW_EH_PE_sdata4;
339 LSDAEncoding = dwarf::DW_EH_PE_absptr;
340 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
341 FDEEncoding = dwarf::DW_EH_PE_udata4;
342 TTypeEncoding = dwarf::DW_EH_PE_absptr;
344 case Triple::sparcv9:
345 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
346 if (RelocM == Reloc::PIC_) {
347 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
348 dwarf::DW_EH_PE_sdata4;
349 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
350 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
351 dwarf::DW_EH_PE_sdata4;
353 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
354 FDEEncoding = dwarf::DW_EH_PE_udata4;
355 TTypeEncoding = dwarf::DW_EH_PE_absptr;
357 case Triple::systemz:
358 // All currently-defined code models guarantee that 4-byte PC-relative
359 // values will be in range.
360 if (RelocM == Reloc::PIC_) {
361 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
362 dwarf::DW_EH_PE_sdata4;
363 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
364 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
365 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
366 dwarf::DW_EH_PE_sdata4;
368 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
369 LSDAEncoding = dwarf::DW_EH_PE_absptr;
370 FDEEncoding = dwarf::DW_EH_PE_absptr;
371 TTypeEncoding = dwarf::DW_EH_PE_absptr;
377 // Solaris requires different flags for .eh_frame to seemingly every other
379 EHSectionType = ELF::SHT_PROGBITS;
380 EHSectionFlags = ELF::SHF_ALLOC;
381 if (T.getOS() == Triple::Solaris) {
382 if (T.getArch() == Triple::x86_64)
383 EHSectionType = ELF::SHT_X86_64_UNWIND;
385 EHSectionFlags |= ELF::SHF_WRITE;
391 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
392 ELF::SHF_WRITE | ELF::SHF_ALLOC,
393 SectionKind::getBSS());
396 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
399 SectionKind::getText());
402 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
403 ELF::SHF_WRITE |ELF::SHF_ALLOC,
404 SectionKind::getDataRel());
407 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
409 SectionKind::getReadOnly());
412 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
413 ELF::SHF_ALLOC | ELF::SHF_TLS |
415 SectionKind::getThreadData());
418 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
419 ELF::SHF_ALLOC | ELF::SHF_TLS |
421 SectionKind::getThreadBSS());
424 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
425 ELF::SHF_ALLOC |ELF::SHF_WRITE,
426 SectionKind::getDataRel());
428 DataRelLocalSection =
429 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
430 ELF::SHF_ALLOC |ELF::SHF_WRITE,
431 SectionKind::getDataRelLocal());
434 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
435 ELF::SHF_ALLOC |ELF::SHF_WRITE,
436 SectionKind::getReadOnlyWithRel());
438 DataRelROLocalSection =
439 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
440 ELF::SHF_ALLOC |ELF::SHF_WRITE,
441 SectionKind::getReadOnlyWithRelLocal());
443 MergeableConst4Section =
444 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC |ELF::SHF_MERGE,
446 SectionKind::getMergeableConst4());
448 MergeableConst8Section =
449 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
450 ELF::SHF_ALLOC |ELF::SHF_MERGE,
451 SectionKind::getMergeableConst8());
453 MergeableConst16Section =
454 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
455 ELF::SHF_ALLOC |ELF::SHF_MERGE,
456 SectionKind::getMergeableConst16());
459 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
460 ELF::SHF_ALLOC |ELF::SHF_WRITE,
461 SectionKind::getDataRel());
464 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
465 ELF::SHF_ALLOC |ELF::SHF_WRITE,
466 SectionKind::getDataRel());
468 // Exception Handling Sections.
470 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
471 // it contains relocatable pointers. In PIC mode, this is probably a big
472 // runtime hit for C++ apps. Either the contents of the LSDA need to be
473 // adjusted or this should be a data section.
475 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
477 SectionKind::getReadOnly());
479 COFFDebugSymbolsSection = nullptr;
481 // Debug Info Sections.
483 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
484 SectionKind::getMetadata());
486 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
487 SectionKind::getMetadata());
489 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
490 SectionKind::getMetadata());
492 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
493 SectionKind::getMetadata());
494 DwarfPubNamesSection =
495 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
496 SectionKind::getMetadata());
497 DwarfPubTypesSection =
498 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
499 SectionKind::getMetadata());
500 DwarfGnuPubNamesSection =
501 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
502 SectionKind::getMetadata());
503 DwarfGnuPubTypesSection =
504 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
505 SectionKind::getMetadata());
507 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
508 ELF::SHF_MERGE | ELF::SHF_STRINGS,
509 SectionKind::getMergeable1ByteCString());
511 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
512 SectionKind::getMetadata());
513 DwarfARangesSection =
514 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
515 SectionKind::getMetadata());
517 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
518 SectionKind::getMetadata());
519 DwarfMacroInfoSection =
520 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
521 SectionKind::getMetadata());
523 // DWARF5 Experimental Debug Info
525 // Accelerator Tables
526 DwarfAccelNamesSection =
527 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
528 SectionKind::getMetadata());
529 DwarfAccelObjCSection =
530 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
531 SectionKind::getMetadata());
532 DwarfAccelNamespaceSection =
533 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
534 SectionKind::getMetadata());
535 DwarfAccelTypesSection =
536 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
537 SectionKind::getMetadata());
540 DwarfInfoDWOSection =
541 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
542 SectionKind::getMetadata());
543 DwarfAbbrevDWOSection =
544 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
545 SectionKind::getMetadata());
547 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
548 ELF::SHF_MERGE | ELF::SHF_STRINGS,
549 SectionKind::getMergeable1ByteCString());
550 DwarfLineDWOSection =
551 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
552 SectionKind::getMetadata());
554 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
555 SectionKind::getMetadata());
556 DwarfStrOffDWOSection =
557 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
558 SectionKind::getMetadata());
560 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
561 SectionKind::getMetadata());
565 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
566 // The object file format cannot represent common symbols with explicit
568 CommDirectiveSupportsAlignment = false;
572 Ctx->getCOFFSection(".bss",
573 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
574 COFF::IMAGE_SCN_MEM_READ |
575 COFF::IMAGE_SCN_MEM_WRITE,
576 SectionKind::getBSS());
578 Ctx->getCOFFSection(".text",
579 COFF::IMAGE_SCN_CNT_CODE |
580 COFF::IMAGE_SCN_MEM_EXECUTE |
581 COFF::IMAGE_SCN_MEM_READ,
582 SectionKind::getText());
584 Ctx->getCOFFSection(".data",
585 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
586 COFF::IMAGE_SCN_MEM_READ |
587 COFF::IMAGE_SCN_MEM_WRITE,
588 SectionKind::getDataRel());
590 Ctx->getCOFFSection(".rdata",
591 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
592 COFF::IMAGE_SCN_MEM_READ,
593 SectionKind::getReadOnly());
594 if (T.isKnownWindowsMSVCEnvironment()) {
596 Ctx->getCOFFSection(".CRT$XCU",
597 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
598 COFF::IMAGE_SCN_MEM_READ,
599 SectionKind::getReadOnly());
602 Ctx->getCOFFSection(".ctors",
603 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
604 COFF::IMAGE_SCN_MEM_READ |
605 COFF::IMAGE_SCN_MEM_WRITE,
606 SectionKind::getDataRel());
610 if (T.isKnownWindowsMSVCEnvironment()) {
612 Ctx->getCOFFSection(".CRT$XTX",
613 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
614 COFF::IMAGE_SCN_MEM_READ,
615 SectionKind::getReadOnly());
618 Ctx->getCOFFSection(".dtors",
619 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
620 COFF::IMAGE_SCN_MEM_READ |
621 COFF::IMAGE_SCN_MEM_WRITE,
622 SectionKind::getDataRel());
625 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
626 // though it contains relocatable pointers. In PIC mode, this is probably a
627 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
628 // adjusted or this should be a data section.
630 Ctx->getCOFFSection(".gcc_except_table",
631 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
632 COFF::IMAGE_SCN_MEM_READ,
633 SectionKind::getReadOnly());
636 COFFDebugSymbolsSection =
637 Ctx->getCOFFSection(".debug$S",
638 COFF::IMAGE_SCN_MEM_DISCARDABLE |
639 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
640 COFF::IMAGE_SCN_MEM_READ,
641 SectionKind::getMetadata());
644 Ctx->getCOFFSection(".debug_abbrev",
645 COFF::IMAGE_SCN_MEM_DISCARDABLE |
646 COFF::IMAGE_SCN_MEM_READ,
647 SectionKind::getMetadata());
649 Ctx->getCOFFSection(".debug_info",
650 COFF::IMAGE_SCN_MEM_DISCARDABLE |
651 COFF::IMAGE_SCN_MEM_READ,
652 SectionKind::getMetadata());
654 Ctx->getCOFFSection(".debug_line",
655 COFF::IMAGE_SCN_MEM_DISCARDABLE |
656 COFF::IMAGE_SCN_MEM_READ,
657 SectionKind::getMetadata());
659 Ctx->getCOFFSection(".debug_frame",
660 COFF::IMAGE_SCN_MEM_DISCARDABLE |
661 COFF::IMAGE_SCN_MEM_READ,
662 SectionKind::getMetadata());
663 DwarfPubNamesSection =
664 Ctx->getCOFFSection(".debug_pubnames",
665 COFF::IMAGE_SCN_MEM_DISCARDABLE |
666 COFF::IMAGE_SCN_MEM_READ,
667 SectionKind::getMetadata());
668 DwarfPubTypesSection =
669 Ctx->getCOFFSection(".debug_pubtypes",
670 COFF::IMAGE_SCN_MEM_DISCARDABLE |
671 COFF::IMAGE_SCN_MEM_READ,
672 SectionKind::getMetadata());
673 DwarfGnuPubNamesSection =
674 Ctx->getCOFFSection(".debug_gnu_pubnames",
675 COFF::IMAGE_SCN_MEM_DISCARDABLE |
676 COFF::IMAGE_SCN_MEM_READ,
677 SectionKind::getMetadata());
678 DwarfGnuPubTypesSection =
679 Ctx->getCOFFSection(".debug_gnu_pubtypes",
680 COFF::IMAGE_SCN_MEM_DISCARDABLE |
681 COFF::IMAGE_SCN_MEM_READ,
682 SectionKind::getMetadata());
684 Ctx->getCOFFSection(".debug_str",
685 COFF::IMAGE_SCN_MEM_DISCARDABLE |
686 COFF::IMAGE_SCN_MEM_READ,
687 SectionKind::getMetadata());
689 Ctx->getCOFFSection(".debug_loc",
690 COFF::IMAGE_SCN_MEM_DISCARDABLE |
691 COFF::IMAGE_SCN_MEM_READ,
692 SectionKind::getMetadata());
693 DwarfARangesSection =
694 Ctx->getCOFFSection(".debug_aranges",
695 COFF::IMAGE_SCN_MEM_DISCARDABLE |
696 COFF::IMAGE_SCN_MEM_READ,
697 SectionKind::getMetadata());
699 Ctx->getCOFFSection(".debug_ranges",
700 COFF::IMAGE_SCN_MEM_DISCARDABLE |
701 COFF::IMAGE_SCN_MEM_READ,
702 SectionKind::getMetadata());
703 DwarfMacroInfoSection =
704 Ctx->getCOFFSection(".debug_macinfo",
705 COFF::IMAGE_SCN_MEM_DISCARDABLE |
706 COFF::IMAGE_SCN_MEM_READ,
707 SectionKind::getMetadata());
708 DwarfInfoDWOSection =
709 Ctx->getCOFFSection(".debug_info.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
710 COFF::IMAGE_SCN_MEM_READ,
711 SectionKind::getMetadata());
712 DwarfAbbrevDWOSection =
713 Ctx->getCOFFSection(".debug_abbrev.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
714 COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getMetadata());
717 Ctx->getCOFFSection(".debug_str.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
718 COFF::IMAGE_SCN_MEM_READ,
719 SectionKind::getMetadata());
720 DwarfLineDWOSection =
721 Ctx->getCOFFSection(".debug_line.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
722 COFF::IMAGE_SCN_MEM_READ,
723 SectionKind::getMetadata());
725 Ctx->getCOFFSection(".debug_loc.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
726 COFF::IMAGE_SCN_MEM_READ,
727 SectionKind::getMetadata());
728 DwarfStrOffDWOSection =
729 Ctx->getCOFFSection(".debug_str_offsets.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
730 COFF::IMAGE_SCN_MEM_READ,
731 SectionKind::getMetadata());
732 DwarfAddrSection = Ctx->getCOFFSection(
733 ".debug_addr", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ,
734 SectionKind::getMetadata());
737 Ctx->getCOFFSection(".drectve",
738 COFF::IMAGE_SCN_LNK_INFO,
739 SectionKind::getMetadata());
742 Ctx->getCOFFSection(".pdata",
743 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
744 COFF::IMAGE_SCN_MEM_READ,
745 SectionKind::getDataRel());
748 Ctx->getCOFFSection(".xdata",
749 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
750 COFF::IMAGE_SCN_MEM_READ,
751 SectionKind::getDataRel());
753 Ctx->getCOFFSection(".tls$",
754 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
755 COFF::IMAGE_SCN_MEM_READ |
756 COFF::IMAGE_SCN_MEM_WRITE,
757 SectionKind::getDataRel());
760 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
768 CommDirectiveSupportsAlignment = true;
769 SupportsWeakOmittedEHFrame = true;
770 IsFunctionEHFrameSymbolPrivate = true;
771 SupportsCompactUnwindWithoutEHFrame = false;
773 PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
774 TTypeEncoding = dwarf::DW_EH_PE_absptr;
776 CompactUnwindDwarfEHFrameOnly = 0;
778 EHFrameSection = nullptr; // Created on demand.
779 CompactUnwindSection = nullptr; // Used only by selected targets.
780 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
781 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
782 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
783 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
786 Triple::ArchType Arch = T.getArch();
787 // FIXME: Checking for Arch here to filter out bogus triples such as
788 // cellspu-apple-darwin. Perhaps we should fix in Triple?
789 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
790 Arch == Triple::arm || Arch == Triple::thumb ||
791 Arch == Triple::arm64 ||
792 Arch == Triple::ppc || Arch == Triple::ppc64 ||
793 Arch == Triple::UnknownArch) &&
794 (T.isOSDarwin() || T.isOSBinFormatMachO())) {
796 InitMachOMCObjectFileInfo(T);
797 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
798 Arch == Triple::arm || Arch == Triple::thumb) &&
799 (T.isOSWindows() && T.getObjectFormat() == Triple::COFF)) {
801 InitCOFFMCObjectFileInfo(T);
804 InitELFMCObjectFileInfo(T);
808 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
809 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
810 SectionKind::getMetadata(), 0, utostr(Hash));
814 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
815 return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS,
816 ELF::SHF_GROUP, SectionKind::getMetadata(), 0,
820 void MCObjectFileInfo::InitEHFrameSection() {
823 Ctx->getMachOSection("__TEXT", "__eh_frame",
825 MachO::S_ATTR_NO_TOC |
826 MachO::S_ATTR_STRIP_STATIC_SYMS |
827 MachO::S_ATTR_LIVE_SUPPORT,
828 SectionKind::getReadOnly());
829 else if (Env == IsELF)
831 Ctx->getELFSection(".eh_frame", EHSectionType,
833 SectionKind::getDataRel());
836 Ctx->getCOFFSection(".eh_frame",
837 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
838 COFF::IMAGE_SCN_MEM_READ |
839 COFF::IMAGE_SCN_MEM_WRITE,
840 SectionKind::getDataRel());