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/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"
21 static bool useCompactUnwind(const Triple &T) {
26 // aarch64 always has it.
27 if (T.getArch() == Triple::aarch64)
30 // Use it on newer version of OS X.
31 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
34 // And the iOS simulator.
36 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
42 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
44 SupportsWeakOmittedEHFrame = false;
46 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
47 SupportsCompactUnwindWithoutEHFrame = true;
49 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
50 | dwarf::DW_EH_PE_sdata4;
51 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
52 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
53 dwarf::DW_EH_PE_sdata4;
55 // .comm doesn't support alignment before Leopard.
56 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
57 CommDirectiveSupportsAlignment = false;
60 = Ctx->getMachOSection("__TEXT", "__text",
61 MachO::S_ATTR_PURE_INSTRUCTIONS,
62 SectionKind::getText());
64 = Ctx->getMachOSection("__DATA", "__data", 0,
65 SectionKind::getDataRel());
67 // BSSSection might not be expected initialized on msvc.
70 TLSDataSection // .tdata
71 = Ctx->getMachOSection("__DATA", "__thread_data",
72 MachO::S_THREAD_LOCAL_REGULAR,
73 SectionKind::getDataRel());
74 TLSBSSSection // .tbss
75 = Ctx->getMachOSection("__DATA", "__thread_bss",
76 MachO::S_THREAD_LOCAL_ZEROFILL,
77 SectionKind::getThreadBSS());
79 // TODO: Verify datarel below.
81 = Ctx->getMachOSection("__DATA", "__thread_vars",
82 MachO::S_THREAD_LOCAL_VARIABLES,
83 SectionKind::getDataRel());
86 = Ctx->getMachOSection("__DATA", "__thread_init",
87 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
88 SectionKind::getDataRel());
90 CStringSection // .cstring
91 = Ctx->getMachOSection("__TEXT", "__cstring",
92 MachO::S_CSTRING_LITERALS,
93 SectionKind::getMergeable1ByteCString());
95 = Ctx->getMachOSection("__TEXT","__ustring", 0,
96 SectionKind::getMergeable2ByteCString());
97 FourByteConstantSection // .literal4
98 = Ctx->getMachOSection("__TEXT", "__literal4",
99 MachO::S_4BYTE_LITERALS,
100 SectionKind::getMergeableConst4());
101 EightByteConstantSection // .literal8
102 = Ctx->getMachOSection("__TEXT", "__literal8",
103 MachO::S_8BYTE_LITERALS,
104 SectionKind::getMergeableConst8());
106 SixteenByteConstantSection // .literal16
107 = Ctx->getMachOSection("__TEXT", "__literal16",
108 MachO::S_16BYTE_LITERALS,
109 SectionKind::getMergeableConst16());
111 ReadOnlySection // .const
112 = Ctx->getMachOSection("__TEXT", "__const", 0,
113 SectionKind::getReadOnly());
116 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
118 MachO::S_ATTR_PURE_INSTRUCTIONS,
119 SectionKind::getText());
121 = Ctx->getMachOSection("__TEXT", "__const_coal",
123 SectionKind::getReadOnly());
124 ConstDataSection // .const_data
125 = Ctx->getMachOSection("__DATA", "__const", 0,
126 SectionKind::getReadOnlyWithRel());
128 = Ctx->getMachOSection("__DATA","__datacoal_nt",
130 SectionKind::getDataRel());
132 = Ctx->getMachOSection("__DATA","__common",
134 SectionKind::getBSS());
136 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
137 SectionKind::getBSS());
140 LazySymbolPointerSection
141 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
142 MachO::S_LAZY_SYMBOL_POINTERS,
143 SectionKind::getMetadata());
144 NonLazySymbolPointerSection
145 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
146 MachO::S_NON_LAZY_SYMBOL_POINTERS,
147 SectionKind::getMetadata());
149 if (RelocM == Reloc::Static) {
151 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
152 SectionKind::getDataRel());
154 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
155 SectionKind::getDataRel());
158 = Ctx->getMachOSection("__DATA", "__mod_init_func",
159 MachO::S_MOD_INIT_FUNC_POINTERS,
160 SectionKind::getDataRel());
162 = Ctx->getMachOSection("__DATA", "__mod_term_func",
163 MachO::S_MOD_TERM_FUNC_POINTERS,
164 SectionKind::getDataRel());
167 // Exception Handling.
168 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
169 SectionKind::getReadOnlyWithRel());
171 COFFDebugSymbolsSection = nullptr;
173 if (useCompactUnwind(T)) {
174 CompactUnwindSection =
175 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
176 SectionKind::getReadOnly());
178 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
179 CompactUnwindDwarfEHFrameOnly = 0x04000000;
180 else if (T.getArch() == Triple::aarch64)
181 CompactUnwindDwarfEHFrameOnly = 0x03000000;
184 // Debug Information.
185 DwarfAccelNamesSection =
186 Ctx->getMachOSection("__DWARF", "__apple_names",
188 SectionKind::getMetadata());
189 DwarfAccelObjCSection =
190 Ctx->getMachOSection("__DWARF", "__apple_objc",
192 SectionKind::getMetadata());
193 // 16 character section limit...
194 DwarfAccelNamespaceSection =
195 Ctx->getMachOSection("__DWARF", "__apple_namespac",
197 SectionKind::getMetadata());
198 DwarfAccelTypesSection =
199 Ctx->getMachOSection("__DWARF", "__apple_types",
201 SectionKind::getMetadata());
204 Ctx->getMachOSection("__DWARF", "__debug_abbrev",
206 SectionKind::getMetadata());
208 Ctx->getMachOSection("__DWARF", "__debug_info",
210 SectionKind::getMetadata());
212 Ctx->getMachOSection("__DWARF", "__debug_line",
214 SectionKind::getMetadata());
216 Ctx->getMachOSection("__DWARF", "__debug_frame",
218 SectionKind::getMetadata());
219 DwarfPubNamesSection =
220 Ctx->getMachOSection("__DWARF", "__debug_pubnames",
222 SectionKind::getMetadata());
223 DwarfPubTypesSection =
224 Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
226 SectionKind::getMetadata());
227 DwarfGnuPubNamesSection =
228 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
230 SectionKind::getMetadata());
231 DwarfGnuPubTypesSection =
232 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
234 SectionKind::getMetadata());
236 Ctx->getMachOSection("__DWARF", "__debug_str",
238 SectionKind::getMetadata());
240 Ctx->getMachOSection("__DWARF", "__debug_loc",
242 SectionKind::getMetadata());
243 DwarfARangesSection =
244 Ctx->getMachOSection("__DWARF", "__debug_aranges",
246 SectionKind::getMetadata());
248 Ctx->getMachOSection("__DWARF", "__debug_ranges",
250 SectionKind::getMetadata());
251 DwarfMacroInfoSection =
252 Ctx->getMachOSection("__DWARF", "__debug_macinfo",
254 SectionKind::getMetadata());
255 DwarfDebugInlineSection =
256 Ctx->getMachOSection("__DWARF", "__debug_inlined",
258 SectionKind::getMetadata());
260 Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
261 SectionKind::getMetadata());
263 TLSExtraDataSection = TLSTLVSection;
266 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
267 switch (T.getArch()) {
270 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
273 case Triple::mips64el:
274 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
277 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
281 switch (T.getArch()) {
285 case Triple::thumbeb:
286 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
288 // Fallthrough if not using EHABI
291 PersonalityEncoding = (RelocM == Reloc::PIC_)
292 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
293 : dwarf::DW_EH_PE_absptr;
294 LSDAEncoding = (RelocM == Reloc::PIC_)
295 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
296 : dwarf::DW_EH_PE_absptr;
297 TTypeEncoding = (RelocM == Reloc::PIC_)
298 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
299 : dwarf::DW_EH_PE_absptr;
302 if (RelocM == Reloc::PIC_) {
303 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
304 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
305 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
306 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
307 (CMModel == CodeModel::Small
308 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
309 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
310 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
311 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
313 PersonalityEncoding =
314 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
315 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
316 LSDAEncoding = (CMModel == CodeModel::Small)
317 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
318 TTypeEncoding = (CMModel == CodeModel::Small)
319 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
322 case Triple::aarch64:
323 case Triple::aarch64_be:
324 // The small model guarantees static code/data size < 4GB, but not where it
325 // will be in memory. Most of these could end up >2GB away so even a signed
326 // pc-relative 32-bit address is insufficient, theoretically.
327 if (RelocM == Reloc::PIC_) {
328 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
329 dwarf::DW_EH_PE_sdata8;
330 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
331 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
332 dwarf::DW_EH_PE_sdata8;
334 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
335 LSDAEncoding = dwarf::DW_EH_PE_absptr;
336 TTypeEncoding = dwarf::DW_EH_PE_absptr;
341 // MIPS uses indirect pointer to refer personality functions, so that the
342 // eh_frame section can be read-only. DW.ref.personality will be generated
344 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
347 case Triple::ppc64le:
348 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
349 dwarf::DW_EH_PE_udata8;
350 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
351 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
352 dwarf::DW_EH_PE_udata8;
355 if (RelocM == Reloc::PIC_) {
356 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
357 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
358 dwarf::DW_EH_PE_sdata4;
359 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
360 dwarf::DW_EH_PE_sdata4;
362 LSDAEncoding = dwarf::DW_EH_PE_absptr;
363 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
364 TTypeEncoding = dwarf::DW_EH_PE_absptr;
367 case Triple::sparcv9:
368 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
369 if (RelocM == Reloc::PIC_) {
370 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
371 dwarf::DW_EH_PE_sdata4;
372 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
373 dwarf::DW_EH_PE_sdata4;
375 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
376 TTypeEncoding = dwarf::DW_EH_PE_absptr;
379 case Triple::systemz:
380 // All currently-defined code models guarantee that 4-byte PC-relative
381 // values will be in range.
382 if (RelocM == Reloc::PIC_) {
383 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
384 dwarf::DW_EH_PE_sdata4;
385 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
386 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
387 dwarf::DW_EH_PE_sdata4;
389 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
390 LSDAEncoding = dwarf::DW_EH_PE_absptr;
391 TTypeEncoding = dwarf::DW_EH_PE_absptr;
398 // Solaris requires different flags for .eh_frame to seemingly every other
400 EHSectionType = ELF::SHT_PROGBITS;
401 EHSectionFlags = ELF::SHF_ALLOC;
402 if (T.getOS() == Triple::Solaris) {
403 if (T.getArch() == Triple::x86_64)
404 EHSectionType = ELF::SHT_X86_64_UNWIND;
406 EHSectionFlags |= ELF::SHF_WRITE;
412 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
413 ELF::SHF_WRITE | ELF::SHF_ALLOC,
414 SectionKind::getBSS());
417 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
420 SectionKind::getText());
423 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
424 ELF::SHF_WRITE |ELF::SHF_ALLOC,
425 SectionKind::getDataRel());
428 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
430 SectionKind::getReadOnly());
433 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
434 ELF::SHF_ALLOC | ELF::SHF_TLS |
436 SectionKind::getThreadData());
439 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
440 ELF::SHF_ALLOC | ELF::SHF_TLS |
442 SectionKind::getThreadBSS());
445 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
446 ELF::SHF_ALLOC |ELF::SHF_WRITE,
447 SectionKind::getDataRel());
449 DataRelLocalSection =
450 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
451 ELF::SHF_ALLOC |ELF::SHF_WRITE,
452 SectionKind::getDataRelLocal());
455 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
456 ELF::SHF_ALLOC |ELF::SHF_WRITE,
457 SectionKind::getReadOnlyWithRel());
459 DataRelROLocalSection =
460 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
461 ELF::SHF_ALLOC |ELF::SHF_WRITE,
462 SectionKind::getReadOnlyWithRelLocal());
464 MergeableConst4Section =
465 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
466 ELF::SHF_ALLOC |ELF::SHF_MERGE,
467 SectionKind::getMergeableConst4());
469 MergeableConst8Section =
470 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
471 ELF::SHF_ALLOC |ELF::SHF_MERGE,
472 SectionKind::getMergeableConst8());
474 MergeableConst16Section =
475 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
476 ELF::SHF_ALLOC |ELF::SHF_MERGE,
477 SectionKind::getMergeableConst16());
480 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
481 ELF::SHF_ALLOC |ELF::SHF_WRITE,
482 SectionKind::getDataRel());
485 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
486 ELF::SHF_ALLOC |ELF::SHF_WRITE,
487 SectionKind::getDataRel());
489 // Exception Handling Sections.
491 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
492 // it contains relocatable pointers. In PIC mode, this is probably a big
493 // runtime hit for C++ apps. Either the contents of the LSDA need to be
494 // adjusted or this should be a data section.
496 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
498 SectionKind::getReadOnly());
500 COFFDebugSymbolsSection = nullptr;
502 // Debug Info Sections.
504 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
505 SectionKind::getMetadata());
507 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
508 SectionKind::getMetadata());
510 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
511 SectionKind::getMetadata());
513 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
514 SectionKind::getMetadata());
515 DwarfPubNamesSection =
516 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
517 SectionKind::getMetadata());
518 DwarfPubTypesSection =
519 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
520 SectionKind::getMetadata());
521 DwarfGnuPubNamesSection =
522 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
523 SectionKind::getMetadata());
524 DwarfGnuPubTypesSection =
525 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
526 SectionKind::getMetadata());
528 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
529 ELF::SHF_MERGE | ELF::SHF_STRINGS,
530 SectionKind::getMergeable1ByteCString());
532 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
533 SectionKind::getMetadata());
534 DwarfARangesSection =
535 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
536 SectionKind::getMetadata());
538 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
539 SectionKind::getMetadata());
540 DwarfMacroInfoSection =
541 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
542 SectionKind::getMetadata());
544 // DWARF5 Experimental Debug Info
546 // Accelerator Tables
547 DwarfAccelNamesSection =
548 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
549 SectionKind::getMetadata());
550 DwarfAccelObjCSection =
551 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
552 SectionKind::getMetadata());
553 DwarfAccelNamespaceSection =
554 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
555 SectionKind::getMetadata());
556 DwarfAccelTypesSection =
557 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
558 SectionKind::getMetadata());
561 DwarfInfoDWOSection =
562 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
563 SectionKind::getMetadata());
564 DwarfTypesDWOSection =
565 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0,
566 SectionKind::getMetadata());
567 DwarfAbbrevDWOSection =
568 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
569 SectionKind::getMetadata());
571 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
572 ELF::SHF_MERGE | ELF::SHF_STRINGS,
573 SectionKind::getMergeable1ByteCString());
574 DwarfLineDWOSection =
575 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
576 SectionKind::getMetadata());
578 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
579 SectionKind::getMetadata());
580 DwarfStrOffDWOSection =
581 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
582 SectionKind::getMetadata());
584 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
585 SectionKind::getMetadata());
588 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS,
590 SectionKind::getMetadata());
595 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
596 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
598 // The object file format cannot represent common symbols with explicit
600 CommDirectiveSupportsAlignment = false;
604 Ctx->getCOFFSection(".bss",
605 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
606 COFF::IMAGE_SCN_MEM_READ |
607 COFF::IMAGE_SCN_MEM_WRITE,
608 SectionKind::getBSS());
610 Ctx->getCOFFSection(".text",
611 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT
612 : (COFF::SectionCharacteristics)0) |
613 COFF::IMAGE_SCN_CNT_CODE |
614 COFF::IMAGE_SCN_MEM_EXECUTE |
615 COFF::IMAGE_SCN_MEM_READ,
616 SectionKind::getText());
618 Ctx->getCOFFSection(".data",
619 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
620 COFF::IMAGE_SCN_MEM_READ |
621 COFF::IMAGE_SCN_MEM_WRITE,
622 SectionKind::getDataRel());
624 Ctx->getCOFFSection(".rdata",
625 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
626 COFF::IMAGE_SCN_MEM_READ,
627 SectionKind::getReadOnly());
629 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
631 Ctx->getCOFFSection(".CRT$XCU",
632 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
633 COFF::IMAGE_SCN_MEM_READ,
634 SectionKind::getReadOnly());
636 Ctx->getCOFFSection(".CRT$XTX",
637 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
638 COFF::IMAGE_SCN_MEM_READ,
639 SectionKind::getReadOnly());
642 Ctx->getCOFFSection(".ctors",
643 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
644 COFF::IMAGE_SCN_MEM_READ |
645 COFF::IMAGE_SCN_MEM_WRITE,
646 SectionKind::getDataRel());
648 Ctx->getCOFFSection(".dtors",
649 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
650 COFF::IMAGE_SCN_MEM_READ |
651 COFF::IMAGE_SCN_MEM_WRITE,
652 SectionKind::getDataRel());
655 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
656 // though it contains relocatable pointers. In PIC mode, this is probably a
657 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
658 // adjusted or this should be a data section.
659 assert(T.isOSWindows() && "Windows is the only supported COFF target");
660 if (T.getArch() == Triple::x86_64) {
661 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
664 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
665 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
666 COFF::IMAGE_SCN_MEM_READ,
667 SectionKind::getReadOnly());
671 COFFDebugSymbolsSection =
672 Ctx->getCOFFSection(".debug$S",
673 COFF::IMAGE_SCN_MEM_DISCARDABLE |
674 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
675 COFF::IMAGE_SCN_MEM_READ,
676 SectionKind::getMetadata());
679 Ctx->getCOFFSection(".debug_abbrev",
680 COFF::IMAGE_SCN_MEM_DISCARDABLE |
681 COFF::IMAGE_SCN_MEM_READ,
682 SectionKind::getMetadata());
684 Ctx->getCOFFSection(".debug_info",
685 COFF::IMAGE_SCN_MEM_DISCARDABLE |
686 COFF::IMAGE_SCN_MEM_READ,
687 SectionKind::getMetadata());
689 Ctx->getCOFFSection(".debug_line",
690 COFF::IMAGE_SCN_MEM_DISCARDABLE |
691 COFF::IMAGE_SCN_MEM_READ,
692 SectionKind::getMetadata());
694 Ctx->getCOFFSection(".debug_frame",
695 COFF::IMAGE_SCN_MEM_DISCARDABLE |
696 COFF::IMAGE_SCN_MEM_READ,
697 SectionKind::getMetadata());
698 DwarfPubNamesSection =
699 Ctx->getCOFFSection(".debug_pubnames",
700 COFF::IMAGE_SCN_MEM_DISCARDABLE |
701 COFF::IMAGE_SCN_MEM_READ,
702 SectionKind::getMetadata());
703 DwarfPubTypesSection =
704 Ctx->getCOFFSection(".debug_pubtypes",
705 COFF::IMAGE_SCN_MEM_DISCARDABLE |
706 COFF::IMAGE_SCN_MEM_READ,
707 SectionKind::getMetadata());
708 DwarfGnuPubNamesSection =
709 Ctx->getCOFFSection(".debug_gnu_pubnames",
710 COFF::IMAGE_SCN_MEM_DISCARDABLE |
711 COFF::IMAGE_SCN_MEM_READ,
712 SectionKind::getMetadata());
713 DwarfGnuPubTypesSection =
714 Ctx->getCOFFSection(".debug_gnu_pubtypes",
715 COFF::IMAGE_SCN_MEM_DISCARDABLE |
716 COFF::IMAGE_SCN_MEM_READ,
717 SectionKind::getMetadata());
719 Ctx->getCOFFSection(".debug_str",
720 COFF::IMAGE_SCN_MEM_DISCARDABLE |
721 COFF::IMAGE_SCN_MEM_READ,
722 SectionKind::getMetadata());
724 Ctx->getCOFFSection(".debug_loc",
725 COFF::IMAGE_SCN_MEM_DISCARDABLE |
726 COFF::IMAGE_SCN_MEM_READ,
727 SectionKind::getMetadata());
728 DwarfARangesSection =
729 Ctx->getCOFFSection(".debug_aranges",
730 COFF::IMAGE_SCN_MEM_DISCARDABLE |
731 COFF::IMAGE_SCN_MEM_READ,
732 SectionKind::getMetadata());
734 Ctx->getCOFFSection(".debug_ranges",
735 COFF::IMAGE_SCN_MEM_DISCARDABLE |
736 COFF::IMAGE_SCN_MEM_READ,
737 SectionKind::getMetadata());
738 DwarfMacroInfoSection =
739 Ctx->getCOFFSection(".debug_macinfo",
740 COFF::IMAGE_SCN_MEM_DISCARDABLE |
741 COFF::IMAGE_SCN_MEM_READ,
742 SectionKind::getMetadata());
743 DwarfInfoDWOSection =
744 Ctx->getCOFFSection(".debug_info.dwo",
745 COFF::IMAGE_SCN_MEM_DISCARDABLE |
746 COFF::IMAGE_SCN_MEM_READ,
747 SectionKind::getMetadata());
748 DwarfTypesDWOSection =
749 Ctx->getCOFFSection(".debug_types.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
750 COFF::IMAGE_SCN_MEM_READ,
751 SectionKind::getMetadata());
752 DwarfAbbrevDWOSection =
753 Ctx->getCOFFSection(".debug_abbrev.dwo",
754 COFF::IMAGE_SCN_MEM_DISCARDABLE |
755 COFF::IMAGE_SCN_MEM_READ,
756 SectionKind::getMetadata());
758 Ctx->getCOFFSection(".debug_str.dwo",
759 COFF::IMAGE_SCN_MEM_DISCARDABLE |
760 COFF::IMAGE_SCN_MEM_READ,
761 SectionKind::getMetadata());
762 DwarfLineDWOSection =
763 Ctx->getCOFFSection(".debug_line.dwo",
764 COFF::IMAGE_SCN_MEM_DISCARDABLE |
765 COFF::IMAGE_SCN_MEM_READ,
766 SectionKind::getMetadata());
768 Ctx->getCOFFSection(".debug_loc.dwo",
769 COFF::IMAGE_SCN_MEM_DISCARDABLE |
770 COFF::IMAGE_SCN_MEM_READ,
771 SectionKind::getMetadata());
772 DwarfStrOffDWOSection =
773 Ctx->getCOFFSection(".debug_str_offsets.dwo",
774 COFF::IMAGE_SCN_MEM_DISCARDABLE |
775 COFF::IMAGE_SCN_MEM_READ,
776 SectionKind::getMetadata());
779 Ctx->getCOFFSection(".debug_addr",
780 COFF::IMAGE_SCN_MEM_DISCARDABLE |
781 COFF::IMAGE_SCN_MEM_READ,
782 SectionKind::getMetadata());
785 Ctx->getCOFFSection(".drectve",
786 COFF::IMAGE_SCN_LNK_INFO |
787 COFF::IMAGE_SCN_LNK_REMOVE,
788 SectionKind::getMetadata());
791 Ctx->getCOFFSection(".pdata",
792 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
793 COFF::IMAGE_SCN_MEM_READ,
794 SectionKind::getDataRel());
797 Ctx->getCOFFSection(".xdata",
798 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
799 COFF::IMAGE_SCN_MEM_READ,
800 SectionKind::getDataRel());
803 Ctx->getCOFFSection(".tls$",
804 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
805 COFF::IMAGE_SCN_MEM_READ |
806 COFF::IMAGE_SCN_MEM_WRITE,
807 SectionKind::getDataRel());
810 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
818 CommDirectiveSupportsAlignment = true;
819 SupportsWeakOmittedEHFrame = true;
820 SupportsCompactUnwindWithoutEHFrame = false;
822 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
823 dwarf::DW_EH_PE_absptr;
825 CompactUnwindDwarfEHFrameOnly = 0;
827 EHFrameSection = nullptr; // Created on demand.
828 CompactUnwindSection = nullptr; // Used only by selected targets.
829 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
830 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
831 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
832 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
836 Triple::ArchType Arch = TT.getArch();
837 // FIXME: Checking for Arch here to filter out bogus triples such as
838 // cellspu-apple-darwin. Perhaps we should fix in Triple?
839 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
840 Arch == Triple::arm || Arch == Triple::thumb ||
841 Arch == Triple::aarch64 ||
842 Arch == Triple::ppc || Arch == Triple::ppc64 ||
843 Arch == Triple::UnknownArch) &&
844 (TT.isOSDarwin() || TT.isOSBinFormatMachO())) {
846 InitMachOMCObjectFileInfo(TT);
847 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
848 Arch == Triple::arm || Arch == Triple::thumb) &&
849 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
851 InitCOFFMCObjectFileInfo(TT);
854 InitELFMCObjectFileInfo(TT);
858 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
859 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
860 SectionKind::getMetadata(), 0, utostr(Hash));
863 void MCObjectFileInfo::InitEHFrameSection() {
866 Ctx->getMachOSection("__TEXT", "__eh_frame",
868 MachO::S_ATTR_NO_TOC |
869 MachO::S_ATTR_STRIP_STATIC_SYMS |
870 MachO::S_ATTR_LIVE_SUPPORT,
871 SectionKind::getReadOnly());
872 else if (Env == IsELF)
874 Ctx->getELFSection(".eh_frame", EHSectionType,
876 SectionKind::getDataRel());
879 Ctx->getCOFFSection(".eh_frame",
880 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
881 COFF::IMAGE_SCN_MEM_READ |
882 COFF::IMAGE_SCN_MEM_WRITE,
883 SectionKind::getDataRel());