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 |
278 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
279 : dwarf::DW_EH_PE_sdata4);
283 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
287 switch (T.getArch()) {
291 case Triple::thumbeb:
292 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
294 // Fallthrough if not using EHABI
297 PersonalityEncoding = (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;
300 LSDAEncoding = (RelocM == Reloc::PIC_)
301 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
302 : dwarf::DW_EH_PE_absptr;
303 TTypeEncoding = (RelocM == Reloc::PIC_)
304 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
305 : dwarf::DW_EH_PE_absptr;
308 if (RelocM == Reloc::PIC_) {
309 PersonalityEncoding = 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);
312 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
313 (CMModel == CodeModel::Small
314 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
315 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
316 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
317 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
319 PersonalityEncoding =
320 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
321 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
322 LSDAEncoding = (CMModel == CodeModel::Small)
323 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
324 TTypeEncoding = (CMModel == CodeModel::Small)
325 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
328 case Triple::aarch64:
329 case Triple::aarch64_be:
330 // The small model guarantees static code/data size < 4GB, but not where it
331 // will be in memory. Most of these could end up >2GB away so even a signed
332 // pc-relative 32-bit address is insufficient, theoretically.
333 if (RelocM == Reloc::PIC_) {
334 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
335 dwarf::DW_EH_PE_sdata8;
336 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
337 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
338 dwarf::DW_EH_PE_sdata8;
340 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
341 LSDAEncoding = dwarf::DW_EH_PE_absptr;
342 TTypeEncoding = dwarf::DW_EH_PE_absptr;
348 case Triple::mips64el:
349 // MIPS uses indirect pointer to refer personality functions, so that the
350 // eh_frame section can be read-only. DW.ref.personality will be generated
352 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
355 case Triple::ppc64le:
356 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
357 dwarf::DW_EH_PE_udata8;
358 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
359 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
360 dwarf::DW_EH_PE_udata8;
363 if (RelocM == Reloc::PIC_) {
364 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
365 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
366 dwarf::DW_EH_PE_sdata4;
367 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
368 dwarf::DW_EH_PE_sdata4;
370 LSDAEncoding = dwarf::DW_EH_PE_absptr;
371 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
372 TTypeEncoding = dwarf::DW_EH_PE_absptr;
375 case Triple::sparcv9:
376 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
377 if (RelocM == Reloc::PIC_) {
378 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
379 dwarf::DW_EH_PE_sdata4;
380 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
381 dwarf::DW_EH_PE_sdata4;
383 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
384 TTypeEncoding = dwarf::DW_EH_PE_absptr;
387 case Triple::systemz:
388 // All currently-defined code models guarantee that 4-byte PC-relative
389 // values will be in range.
390 if (RelocM == Reloc::PIC_) {
391 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
392 dwarf::DW_EH_PE_sdata4;
393 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
394 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
395 dwarf::DW_EH_PE_sdata4;
397 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
398 LSDAEncoding = dwarf::DW_EH_PE_absptr;
399 TTypeEncoding = dwarf::DW_EH_PE_absptr;
406 // Solaris requires different flags for .eh_frame to seemingly every other
408 EHSectionType = ELF::SHT_PROGBITS;
409 EHSectionFlags = ELF::SHF_ALLOC;
410 if (T.isOSSolaris()) {
411 if (T.getArch() == Triple::x86_64)
412 EHSectionType = ELF::SHT_X86_64_UNWIND;
414 EHSectionFlags |= ELF::SHF_WRITE;
420 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
421 ELF::SHF_WRITE | ELF::SHF_ALLOC,
422 SectionKind::getBSS());
425 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
428 SectionKind::getText());
431 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
432 ELF::SHF_WRITE |ELF::SHF_ALLOC,
433 SectionKind::getDataRel());
436 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
438 SectionKind::getReadOnly());
441 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
442 ELF::SHF_ALLOC | ELF::SHF_TLS |
444 SectionKind::getThreadData());
447 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
448 ELF::SHF_ALLOC | ELF::SHF_TLS |
450 SectionKind::getThreadBSS());
453 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
454 ELF::SHF_ALLOC |ELF::SHF_WRITE,
455 SectionKind::getDataRel());
457 DataRelLocalSection =
458 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
459 ELF::SHF_ALLOC |ELF::SHF_WRITE,
460 SectionKind::getDataRelLocal());
463 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
464 ELF::SHF_ALLOC |ELF::SHF_WRITE,
465 SectionKind::getReadOnlyWithRel());
467 DataRelROLocalSection =
468 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
469 ELF::SHF_ALLOC |ELF::SHF_WRITE,
470 SectionKind::getReadOnlyWithRelLocal());
472 MergeableConst4Section =
473 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
474 ELF::SHF_ALLOC |ELF::SHF_MERGE,
475 SectionKind::getMergeableConst4());
477 MergeableConst8Section =
478 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
479 ELF::SHF_ALLOC |ELF::SHF_MERGE,
480 SectionKind::getMergeableConst8());
482 MergeableConst16Section =
483 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
484 ELF::SHF_ALLOC |ELF::SHF_MERGE,
485 SectionKind::getMergeableConst16());
488 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
489 ELF::SHF_ALLOC |ELF::SHF_WRITE,
490 SectionKind::getDataRel());
493 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
494 ELF::SHF_ALLOC |ELF::SHF_WRITE,
495 SectionKind::getDataRel());
497 // Exception Handling Sections.
499 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
500 // it contains relocatable pointers. In PIC mode, this is probably a big
501 // runtime hit for C++ apps. Either the contents of the LSDA need to be
502 // adjusted or this should be a data section.
504 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
506 SectionKind::getReadOnly());
508 COFFDebugSymbolsSection = nullptr;
510 // Debug Info Sections.
512 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
513 SectionKind::getMetadata());
515 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
516 SectionKind::getMetadata());
518 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
519 SectionKind::getMetadata());
521 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
522 SectionKind::getMetadata());
523 DwarfPubNamesSection =
524 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
525 SectionKind::getMetadata());
526 DwarfPubTypesSection =
527 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
528 SectionKind::getMetadata());
529 DwarfGnuPubNamesSection =
530 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
531 SectionKind::getMetadata());
532 DwarfGnuPubTypesSection =
533 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
534 SectionKind::getMetadata());
536 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
537 ELF::SHF_MERGE | ELF::SHF_STRINGS,
538 SectionKind::getMergeable1ByteCString());
540 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
541 SectionKind::getMetadata());
542 DwarfARangesSection =
543 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
544 SectionKind::getMetadata());
546 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
547 SectionKind::getMetadata());
548 DwarfMacroInfoSection =
549 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
550 SectionKind::getMetadata());
552 // DWARF5 Experimental Debug Info
554 // Accelerator Tables
555 DwarfAccelNamesSection =
556 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
557 SectionKind::getMetadata());
558 DwarfAccelObjCSection =
559 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
560 SectionKind::getMetadata());
561 DwarfAccelNamespaceSection =
562 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
563 SectionKind::getMetadata());
564 DwarfAccelTypesSection =
565 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
566 SectionKind::getMetadata());
569 DwarfInfoDWOSection =
570 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
571 SectionKind::getMetadata());
572 DwarfTypesDWOSection =
573 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0,
574 SectionKind::getMetadata());
575 DwarfAbbrevDWOSection =
576 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
577 SectionKind::getMetadata());
579 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
580 ELF::SHF_MERGE | ELF::SHF_STRINGS,
581 SectionKind::getMergeable1ByteCString());
582 DwarfLineDWOSection =
583 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
584 SectionKind::getMetadata());
586 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
587 SectionKind::getMetadata());
588 DwarfStrOffDWOSection =
589 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
590 SectionKind::getMetadata());
592 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
593 SectionKind::getMetadata());
596 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS,
598 SectionKind::getMetadata());
603 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
604 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
606 CommDirectiveSupportsAlignment = true;
610 Ctx->getCOFFSection(".bss",
611 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
612 COFF::IMAGE_SCN_MEM_READ |
613 COFF::IMAGE_SCN_MEM_WRITE,
614 SectionKind::getBSS());
616 Ctx->getCOFFSection(".text",
617 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT
618 : (COFF::SectionCharacteristics)0) |
619 COFF::IMAGE_SCN_CNT_CODE |
620 COFF::IMAGE_SCN_MEM_EXECUTE |
621 COFF::IMAGE_SCN_MEM_READ,
622 SectionKind::getText());
624 Ctx->getCOFFSection(".data",
625 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
626 COFF::IMAGE_SCN_MEM_READ |
627 COFF::IMAGE_SCN_MEM_WRITE,
628 SectionKind::getDataRel());
630 Ctx->getCOFFSection(".rdata",
631 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
632 COFF::IMAGE_SCN_MEM_READ,
633 SectionKind::getReadOnly());
635 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
637 Ctx->getCOFFSection(".CRT$XCU",
638 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ,
640 SectionKind::getReadOnly());
642 Ctx->getCOFFSection(".CRT$XTX",
643 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
644 COFF::IMAGE_SCN_MEM_READ,
645 SectionKind::getReadOnly());
648 Ctx->getCOFFSection(".ctors",
649 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
650 COFF::IMAGE_SCN_MEM_READ |
651 COFF::IMAGE_SCN_MEM_WRITE,
652 SectionKind::getDataRel());
654 Ctx->getCOFFSection(".dtors",
655 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
656 COFF::IMAGE_SCN_MEM_READ |
657 COFF::IMAGE_SCN_MEM_WRITE,
658 SectionKind::getDataRel());
661 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
662 // though it contains relocatable pointers. In PIC mode, this is probably a
663 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
664 // adjusted or this should be a data section.
665 assert(T.isOSWindows() && "Windows is the only supported COFF target");
666 if (T.getArch() == Triple::x86_64) {
667 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
670 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
671 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
672 COFF::IMAGE_SCN_MEM_READ,
673 SectionKind::getReadOnly());
677 COFFDebugSymbolsSection =
678 Ctx->getCOFFSection(".debug$S",
679 COFF::IMAGE_SCN_MEM_DISCARDABLE |
680 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
681 COFF::IMAGE_SCN_MEM_READ,
682 SectionKind::getMetadata());
685 Ctx->getCOFFSection(".debug_abbrev",
686 COFF::IMAGE_SCN_MEM_DISCARDABLE |
687 COFF::IMAGE_SCN_MEM_READ,
688 SectionKind::getMetadata());
690 Ctx->getCOFFSection(".debug_info",
691 COFF::IMAGE_SCN_MEM_DISCARDABLE |
692 COFF::IMAGE_SCN_MEM_READ,
693 SectionKind::getMetadata());
695 Ctx->getCOFFSection(".debug_line",
696 COFF::IMAGE_SCN_MEM_DISCARDABLE |
697 COFF::IMAGE_SCN_MEM_READ,
698 SectionKind::getMetadata());
700 Ctx->getCOFFSection(".debug_frame",
701 COFF::IMAGE_SCN_MEM_DISCARDABLE |
702 COFF::IMAGE_SCN_MEM_READ,
703 SectionKind::getMetadata());
704 DwarfPubNamesSection =
705 Ctx->getCOFFSection(".debug_pubnames",
706 COFF::IMAGE_SCN_MEM_DISCARDABLE |
707 COFF::IMAGE_SCN_MEM_READ,
708 SectionKind::getMetadata());
709 DwarfPubTypesSection =
710 Ctx->getCOFFSection(".debug_pubtypes",
711 COFF::IMAGE_SCN_MEM_DISCARDABLE |
712 COFF::IMAGE_SCN_MEM_READ,
713 SectionKind::getMetadata());
714 DwarfGnuPubNamesSection =
715 Ctx->getCOFFSection(".debug_gnu_pubnames",
716 COFF::IMAGE_SCN_MEM_DISCARDABLE |
717 COFF::IMAGE_SCN_MEM_READ,
718 SectionKind::getMetadata());
719 DwarfGnuPubTypesSection =
720 Ctx->getCOFFSection(".debug_gnu_pubtypes",
721 COFF::IMAGE_SCN_MEM_DISCARDABLE |
722 COFF::IMAGE_SCN_MEM_READ,
723 SectionKind::getMetadata());
725 Ctx->getCOFFSection(".debug_str",
726 COFF::IMAGE_SCN_MEM_DISCARDABLE |
727 COFF::IMAGE_SCN_MEM_READ,
728 SectionKind::getMetadata());
730 Ctx->getCOFFSection(".debug_loc",
731 COFF::IMAGE_SCN_MEM_DISCARDABLE |
732 COFF::IMAGE_SCN_MEM_READ,
733 SectionKind::getMetadata());
734 DwarfARangesSection =
735 Ctx->getCOFFSection(".debug_aranges",
736 COFF::IMAGE_SCN_MEM_DISCARDABLE |
737 COFF::IMAGE_SCN_MEM_READ,
738 SectionKind::getMetadata());
740 Ctx->getCOFFSection(".debug_ranges",
741 COFF::IMAGE_SCN_MEM_DISCARDABLE |
742 COFF::IMAGE_SCN_MEM_READ,
743 SectionKind::getMetadata());
744 DwarfMacroInfoSection =
745 Ctx->getCOFFSection(".debug_macinfo",
746 COFF::IMAGE_SCN_MEM_DISCARDABLE |
747 COFF::IMAGE_SCN_MEM_READ,
748 SectionKind::getMetadata());
749 DwarfInfoDWOSection =
750 Ctx->getCOFFSection(".debug_info.dwo",
751 COFF::IMAGE_SCN_MEM_DISCARDABLE |
752 COFF::IMAGE_SCN_MEM_READ,
753 SectionKind::getMetadata());
754 DwarfTypesDWOSection =
755 Ctx->getCOFFSection(".debug_types.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
756 COFF::IMAGE_SCN_MEM_READ,
757 SectionKind::getMetadata());
758 DwarfAbbrevDWOSection =
759 Ctx->getCOFFSection(".debug_abbrev.dwo",
760 COFF::IMAGE_SCN_MEM_DISCARDABLE |
761 COFF::IMAGE_SCN_MEM_READ,
762 SectionKind::getMetadata());
764 Ctx->getCOFFSection(".debug_str.dwo",
765 COFF::IMAGE_SCN_MEM_DISCARDABLE |
766 COFF::IMAGE_SCN_MEM_READ,
767 SectionKind::getMetadata());
768 DwarfLineDWOSection =
769 Ctx->getCOFFSection(".debug_line.dwo",
770 COFF::IMAGE_SCN_MEM_DISCARDABLE |
771 COFF::IMAGE_SCN_MEM_READ,
772 SectionKind::getMetadata());
774 Ctx->getCOFFSection(".debug_loc.dwo",
775 COFF::IMAGE_SCN_MEM_DISCARDABLE |
776 COFF::IMAGE_SCN_MEM_READ,
777 SectionKind::getMetadata());
778 DwarfStrOffDWOSection =
779 Ctx->getCOFFSection(".debug_str_offsets.dwo",
780 COFF::IMAGE_SCN_MEM_DISCARDABLE |
781 COFF::IMAGE_SCN_MEM_READ,
782 SectionKind::getMetadata());
785 Ctx->getCOFFSection(".debug_addr",
786 COFF::IMAGE_SCN_MEM_DISCARDABLE |
787 COFF::IMAGE_SCN_MEM_READ,
788 SectionKind::getMetadata());
790 DwarfAccelNamesSection =
791 Ctx->getCOFFSection(".apple_names",
792 COFF::IMAGE_SCN_MEM_DISCARDABLE |
793 COFF::IMAGE_SCN_MEM_READ,
794 SectionKind::getMetadata());
795 DwarfAccelNamespaceSection =
796 Ctx->getCOFFSection(".apple_namespaces",
797 COFF::IMAGE_SCN_MEM_DISCARDABLE |
798 COFF::IMAGE_SCN_MEM_READ,
799 SectionKind::getMetadata());
800 DwarfAccelTypesSection =
801 Ctx->getCOFFSection(".apple_types",
802 COFF::IMAGE_SCN_MEM_DISCARDABLE |
803 COFF::IMAGE_SCN_MEM_READ,
804 SectionKind::getMetadata());
805 DwarfAccelObjCSection =
806 Ctx->getCOFFSection(".apple_objc",
807 COFF::IMAGE_SCN_MEM_DISCARDABLE |
808 COFF::IMAGE_SCN_MEM_READ,
809 SectionKind::getMetadata());
812 Ctx->getCOFFSection(".drectve",
813 COFF::IMAGE_SCN_LNK_INFO |
814 COFF::IMAGE_SCN_LNK_REMOVE,
815 SectionKind::getMetadata());
818 Ctx->getCOFFSection(".pdata",
819 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
820 COFF::IMAGE_SCN_MEM_READ,
821 SectionKind::getDataRel());
824 Ctx->getCOFFSection(".xdata",
825 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
826 COFF::IMAGE_SCN_MEM_READ,
827 SectionKind::getDataRel());
830 Ctx->getCOFFSection(".tls$",
831 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
832 COFF::IMAGE_SCN_MEM_READ |
833 COFF::IMAGE_SCN_MEM_WRITE,
834 SectionKind::getDataRel());
837 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
845 CommDirectiveSupportsAlignment = true;
846 SupportsWeakOmittedEHFrame = true;
847 SupportsCompactUnwindWithoutEHFrame = false;
849 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
850 dwarf::DW_EH_PE_absptr;
852 CompactUnwindDwarfEHFrameOnly = 0;
854 EHFrameSection = nullptr; // Created on demand.
855 CompactUnwindSection = nullptr; // Used only by selected targets.
856 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
857 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
858 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
859 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
863 Triple::ArchType Arch = TT.getArch();
864 // FIXME: Checking for Arch here to filter out bogus triples such as
865 // cellspu-apple-darwin. Perhaps we should fix in Triple?
866 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
867 Arch == Triple::arm || Arch == Triple::thumb ||
868 Arch == Triple::aarch64 ||
869 Arch == Triple::ppc || Arch == Triple::ppc64 ||
870 Arch == Triple::UnknownArch) &&
871 (TT.isOSDarwin() || TT.isOSBinFormatMachO())) {
873 InitMachOMCObjectFileInfo(TT);
874 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
875 Arch == Triple::arm || Arch == Triple::thumb) &&
876 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
878 InitCOFFMCObjectFileInfo(TT);
881 InitELFMCObjectFileInfo(TT);
885 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
886 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
887 SectionKind::getMetadata(), 0, utostr(Hash));
890 void MCObjectFileInfo::InitEHFrameSection() {
893 Ctx->getMachOSection("__TEXT", "__eh_frame",
895 MachO::S_ATTR_NO_TOC |
896 MachO::S_ATTR_STRIP_STATIC_SYMS |
897 MachO::S_ATTR_LIVE_SUPPORT,
898 SectionKind::getReadOnly());
899 else if (Env == IsELF)
901 Ctx->getELFSection(".eh_frame", EHSectionType,
903 SectionKind::getDataRel());
906 Ctx->getCOFFSection(".eh_frame",
907 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
908 COFF::IMAGE_SCN_MEM_READ |
909 COFF::IMAGE_SCN_MEM_WRITE,
910 SectionKind::getDataRel());