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
290 PersonalityEncoding = (RelocM == Reloc::PIC_)
291 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
292 : dwarf::DW_EH_PE_absptr;
293 LSDAEncoding = (RelocM == Reloc::PIC_)
294 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
295 : dwarf::DW_EH_PE_absptr;
296 TTypeEncoding = (RelocM == Reloc::PIC_)
297 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
298 : dwarf::DW_EH_PE_absptr;
301 if (RelocM == Reloc::PIC_) {
302 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
303 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
304 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
305 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
306 (CMModel == CodeModel::Small
307 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
308 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
309 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
310 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
312 PersonalityEncoding =
313 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
314 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
315 LSDAEncoding = (CMModel == CodeModel::Small)
316 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
317 TTypeEncoding = (CMModel == CodeModel::Small)
318 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
321 case Triple::aarch64:
322 case Triple::aarch64_be:
323 // The small model guarantees static code/data size < 4GB, but not where it
324 // will be in memory. Most of these could end up >2GB away so even a signed
325 // pc-relative 32-bit address is insufficient, theoretically.
326 if (RelocM == Reloc::PIC_) {
327 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
328 dwarf::DW_EH_PE_sdata8;
329 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
330 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
331 dwarf::DW_EH_PE_sdata8;
333 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
334 LSDAEncoding = dwarf::DW_EH_PE_absptr;
335 TTypeEncoding = dwarf::DW_EH_PE_absptr;
340 // MIPS uses indirect pointer to refer personality functions, so that the
341 // eh_frame section can be read-only. DW.ref.personality will be generated
343 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
346 case Triple::ppc64le:
347 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
348 dwarf::DW_EH_PE_udata8;
349 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
350 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
351 dwarf::DW_EH_PE_udata8;
354 if (RelocM == Reloc::PIC_) {
355 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
356 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
357 dwarf::DW_EH_PE_sdata4;
358 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
359 dwarf::DW_EH_PE_sdata4;
361 LSDAEncoding = dwarf::DW_EH_PE_absptr;
362 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
363 TTypeEncoding = dwarf::DW_EH_PE_absptr;
366 case Triple::sparcv9:
367 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
368 if (RelocM == Reloc::PIC_) {
369 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
370 dwarf::DW_EH_PE_sdata4;
371 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
372 dwarf::DW_EH_PE_sdata4;
374 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
375 TTypeEncoding = dwarf::DW_EH_PE_absptr;
378 case Triple::systemz:
379 // All currently-defined code models guarantee that 4-byte PC-relative
380 // values will be in range.
381 if (RelocM == Reloc::PIC_) {
382 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
383 dwarf::DW_EH_PE_sdata4;
384 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
385 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
386 dwarf::DW_EH_PE_sdata4;
388 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
389 LSDAEncoding = dwarf::DW_EH_PE_absptr;
390 TTypeEncoding = dwarf::DW_EH_PE_absptr;
397 // Solaris requires different flags for .eh_frame to seemingly every other
399 EHSectionType = ELF::SHT_PROGBITS;
400 EHSectionFlags = ELF::SHF_ALLOC;
401 if (T.getOS() == Triple::Solaris) {
402 if (T.getArch() == Triple::x86_64)
403 EHSectionType = ELF::SHT_X86_64_UNWIND;
405 EHSectionFlags |= ELF::SHF_WRITE;
411 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
412 ELF::SHF_WRITE | ELF::SHF_ALLOC,
413 SectionKind::getBSS());
416 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
419 SectionKind::getText());
422 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
423 ELF::SHF_WRITE |ELF::SHF_ALLOC,
424 SectionKind::getDataRel());
427 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
429 SectionKind::getReadOnly());
432 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
433 ELF::SHF_ALLOC | ELF::SHF_TLS |
435 SectionKind::getThreadData());
438 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
439 ELF::SHF_ALLOC | ELF::SHF_TLS |
441 SectionKind::getThreadBSS());
444 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC |ELF::SHF_WRITE,
446 SectionKind::getDataRel());
448 DataRelLocalSection =
449 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
450 ELF::SHF_ALLOC |ELF::SHF_WRITE,
451 SectionKind::getDataRelLocal());
454 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
455 ELF::SHF_ALLOC |ELF::SHF_WRITE,
456 SectionKind::getReadOnlyWithRel());
458 DataRelROLocalSection =
459 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
460 ELF::SHF_ALLOC |ELF::SHF_WRITE,
461 SectionKind::getReadOnlyWithRelLocal());
463 MergeableConst4Section =
464 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
465 ELF::SHF_ALLOC |ELF::SHF_MERGE,
466 SectionKind::getMergeableConst4());
468 MergeableConst8Section =
469 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
470 ELF::SHF_ALLOC |ELF::SHF_MERGE,
471 SectionKind::getMergeableConst8());
473 MergeableConst16Section =
474 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
475 ELF::SHF_ALLOC |ELF::SHF_MERGE,
476 SectionKind::getMergeableConst16());
479 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
480 ELF::SHF_ALLOC |ELF::SHF_WRITE,
481 SectionKind::getDataRel());
484 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
485 ELF::SHF_ALLOC |ELF::SHF_WRITE,
486 SectionKind::getDataRel());
488 // Exception Handling Sections.
490 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
491 // it contains relocatable pointers. In PIC mode, this is probably a big
492 // runtime hit for C++ apps. Either the contents of the LSDA need to be
493 // adjusted or this should be a data section.
495 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
497 SectionKind::getReadOnly());
499 COFFDebugSymbolsSection = nullptr;
501 // Debug Info Sections.
503 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
504 SectionKind::getMetadata());
506 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
507 SectionKind::getMetadata());
509 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
510 SectionKind::getMetadata());
512 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
513 SectionKind::getMetadata());
514 DwarfPubNamesSection =
515 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
516 SectionKind::getMetadata());
517 DwarfPubTypesSection =
518 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
519 SectionKind::getMetadata());
520 DwarfGnuPubNamesSection =
521 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
522 SectionKind::getMetadata());
523 DwarfGnuPubTypesSection =
524 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
525 SectionKind::getMetadata());
527 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
528 ELF::SHF_MERGE | ELF::SHF_STRINGS,
529 SectionKind::getMergeable1ByteCString());
531 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
532 SectionKind::getMetadata());
533 DwarfARangesSection =
534 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
535 SectionKind::getMetadata());
537 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
538 SectionKind::getMetadata());
539 DwarfMacroInfoSection =
540 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
541 SectionKind::getMetadata());
543 // DWARF5 Experimental Debug Info
545 // Accelerator Tables
546 DwarfAccelNamesSection =
547 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
548 SectionKind::getMetadata());
549 DwarfAccelObjCSection =
550 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
551 SectionKind::getMetadata());
552 DwarfAccelNamespaceSection =
553 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
554 SectionKind::getMetadata());
555 DwarfAccelTypesSection =
556 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
557 SectionKind::getMetadata());
560 DwarfInfoDWOSection =
561 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
562 SectionKind::getMetadata());
563 DwarfAbbrevDWOSection =
564 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
565 SectionKind::getMetadata());
567 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
568 ELF::SHF_MERGE | ELF::SHF_STRINGS,
569 SectionKind::getMergeable1ByteCString());
570 DwarfLineDWOSection =
571 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
572 SectionKind::getMetadata());
574 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
575 SectionKind::getMetadata());
576 DwarfStrOffDWOSection =
577 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
578 SectionKind::getMetadata());
580 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
581 SectionKind::getMetadata());
585 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
586 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
588 // The object file format cannot represent common symbols with explicit
590 CommDirectiveSupportsAlignment = false;
594 Ctx->getCOFFSection(".bss",
595 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
596 COFF::IMAGE_SCN_MEM_READ |
597 COFF::IMAGE_SCN_MEM_WRITE,
598 SectionKind::getBSS());
600 Ctx->getCOFFSection(".text",
601 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT
602 : (COFF::SectionCharacteristics)0) |
603 COFF::IMAGE_SCN_CNT_CODE |
604 COFF::IMAGE_SCN_MEM_EXECUTE |
605 COFF::IMAGE_SCN_MEM_READ,
606 SectionKind::getText());
608 Ctx->getCOFFSection(".data",
609 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
610 COFF::IMAGE_SCN_MEM_READ |
611 COFF::IMAGE_SCN_MEM_WRITE,
612 SectionKind::getDataRel());
614 Ctx->getCOFFSection(".rdata",
615 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
616 COFF::IMAGE_SCN_MEM_READ,
617 SectionKind::getReadOnly());
619 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
621 Ctx->getCOFFSection(".CRT$XCU",
622 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
623 COFF::IMAGE_SCN_MEM_READ,
624 SectionKind::getReadOnly());
626 Ctx->getCOFFSection(".CRT$XTX",
627 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
628 COFF::IMAGE_SCN_MEM_READ,
629 SectionKind::getReadOnly());
632 Ctx->getCOFFSection(".ctors",
633 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
634 COFF::IMAGE_SCN_MEM_READ |
635 COFF::IMAGE_SCN_MEM_WRITE,
636 SectionKind::getDataRel());
638 Ctx->getCOFFSection(".dtors",
639 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
640 COFF::IMAGE_SCN_MEM_READ |
641 COFF::IMAGE_SCN_MEM_WRITE,
642 SectionKind::getDataRel());
645 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
646 // though it contains relocatable pointers. In PIC mode, this is probably a
647 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
648 // adjusted or this should be a data section.
649 assert(T.isOSWindows() && "Windows is the only supported COFF target");
650 if (T.getArch() == Triple::x86_64) {
651 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
654 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
655 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
656 COFF::IMAGE_SCN_MEM_READ,
657 SectionKind::getReadOnly());
661 COFFDebugSymbolsSection =
662 Ctx->getCOFFSection(".debug$S",
663 COFF::IMAGE_SCN_MEM_DISCARDABLE |
664 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
665 COFF::IMAGE_SCN_MEM_READ,
666 SectionKind::getMetadata());
669 Ctx->getCOFFSection(".debug_abbrev",
670 COFF::IMAGE_SCN_MEM_DISCARDABLE |
671 COFF::IMAGE_SCN_MEM_READ,
672 SectionKind::getMetadata());
674 Ctx->getCOFFSection(".debug_info",
675 COFF::IMAGE_SCN_MEM_DISCARDABLE |
676 COFF::IMAGE_SCN_MEM_READ,
677 SectionKind::getMetadata());
679 Ctx->getCOFFSection(".debug_line",
680 COFF::IMAGE_SCN_MEM_DISCARDABLE |
681 COFF::IMAGE_SCN_MEM_READ,
682 SectionKind::getMetadata());
684 Ctx->getCOFFSection(".debug_frame",
685 COFF::IMAGE_SCN_MEM_DISCARDABLE |
686 COFF::IMAGE_SCN_MEM_READ,
687 SectionKind::getMetadata());
688 DwarfPubNamesSection =
689 Ctx->getCOFFSection(".debug_pubnames",
690 COFF::IMAGE_SCN_MEM_DISCARDABLE |
691 COFF::IMAGE_SCN_MEM_READ,
692 SectionKind::getMetadata());
693 DwarfPubTypesSection =
694 Ctx->getCOFFSection(".debug_pubtypes",
695 COFF::IMAGE_SCN_MEM_DISCARDABLE |
696 COFF::IMAGE_SCN_MEM_READ,
697 SectionKind::getMetadata());
698 DwarfGnuPubNamesSection =
699 Ctx->getCOFFSection(".debug_gnu_pubnames",
700 COFF::IMAGE_SCN_MEM_DISCARDABLE |
701 COFF::IMAGE_SCN_MEM_READ,
702 SectionKind::getMetadata());
703 DwarfGnuPubTypesSection =
704 Ctx->getCOFFSection(".debug_gnu_pubtypes",
705 COFF::IMAGE_SCN_MEM_DISCARDABLE |
706 COFF::IMAGE_SCN_MEM_READ,
707 SectionKind::getMetadata());
709 Ctx->getCOFFSection(".debug_str",
710 COFF::IMAGE_SCN_MEM_DISCARDABLE |
711 COFF::IMAGE_SCN_MEM_READ,
712 SectionKind::getMetadata());
714 Ctx->getCOFFSection(".debug_loc",
715 COFF::IMAGE_SCN_MEM_DISCARDABLE |
716 COFF::IMAGE_SCN_MEM_READ,
717 SectionKind::getMetadata());
718 DwarfARangesSection =
719 Ctx->getCOFFSection(".debug_aranges",
720 COFF::IMAGE_SCN_MEM_DISCARDABLE |
721 COFF::IMAGE_SCN_MEM_READ,
722 SectionKind::getMetadata());
724 Ctx->getCOFFSection(".debug_ranges",
725 COFF::IMAGE_SCN_MEM_DISCARDABLE |
726 COFF::IMAGE_SCN_MEM_READ,
727 SectionKind::getMetadata());
728 DwarfMacroInfoSection =
729 Ctx->getCOFFSection(".debug_macinfo",
730 COFF::IMAGE_SCN_MEM_DISCARDABLE |
731 COFF::IMAGE_SCN_MEM_READ,
732 SectionKind::getMetadata());
733 DwarfInfoDWOSection =
734 Ctx->getCOFFSection(".debug_info.dwo",
735 COFF::IMAGE_SCN_MEM_DISCARDABLE |
736 COFF::IMAGE_SCN_MEM_READ,
737 SectionKind::getMetadata());
738 DwarfAbbrevDWOSection =
739 Ctx->getCOFFSection(".debug_abbrev.dwo",
740 COFF::IMAGE_SCN_MEM_DISCARDABLE |
741 COFF::IMAGE_SCN_MEM_READ,
742 SectionKind::getMetadata());
744 Ctx->getCOFFSection(".debug_str.dwo",
745 COFF::IMAGE_SCN_MEM_DISCARDABLE |
746 COFF::IMAGE_SCN_MEM_READ,
747 SectionKind::getMetadata());
748 DwarfLineDWOSection =
749 Ctx->getCOFFSection(".debug_line.dwo",
750 COFF::IMAGE_SCN_MEM_DISCARDABLE |
751 COFF::IMAGE_SCN_MEM_READ,
752 SectionKind::getMetadata());
754 Ctx->getCOFFSection(".debug_loc.dwo",
755 COFF::IMAGE_SCN_MEM_DISCARDABLE |
756 COFF::IMAGE_SCN_MEM_READ,
757 SectionKind::getMetadata());
758 DwarfStrOffDWOSection =
759 Ctx->getCOFFSection(".debug_str_offsets.dwo",
760 COFF::IMAGE_SCN_MEM_DISCARDABLE |
761 COFF::IMAGE_SCN_MEM_READ,
762 SectionKind::getMetadata());
765 Ctx->getCOFFSection(".debug_addr",
766 COFF::IMAGE_SCN_MEM_DISCARDABLE |
767 COFF::IMAGE_SCN_MEM_READ,
768 SectionKind::getMetadata());
771 Ctx->getCOFFSection(".drectve",
772 COFF::IMAGE_SCN_LNK_INFO |
773 COFF::IMAGE_SCN_LNK_REMOVE,
774 SectionKind::getMetadata());
777 Ctx->getCOFFSection(".pdata",
778 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
779 COFF::IMAGE_SCN_MEM_READ,
780 SectionKind::getDataRel());
783 Ctx->getCOFFSection(".xdata",
784 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
785 COFF::IMAGE_SCN_MEM_READ,
786 SectionKind::getDataRel());
789 Ctx->getCOFFSection(".tls$",
790 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
791 COFF::IMAGE_SCN_MEM_READ |
792 COFF::IMAGE_SCN_MEM_WRITE,
793 SectionKind::getDataRel());
796 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
804 CommDirectiveSupportsAlignment = true;
805 SupportsWeakOmittedEHFrame = true;
806 SupportsCompactUnwindWithoutEHFrame = false;
808 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
809 dwarf::DW_EH_PE_absptr;
811 CompactUnwindDwarfEHFrameOnly = 0;
813 EHFrameSection = nullptr; // Created on demand.
814 CompactUnwindSection = nullptr; // Used only by selected targets.
815 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
816 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
817 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
818 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
822 Triple::ArchType Arch = TT.getArch();
823 // FIXME: Checking for Arch here to filter out bogus triples such as
824 // cellspu-apple-darwin. Perhaps we should fix in Triple?
825 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
826 Arch == Triple::arm || Arch == Triple::thumb ||
827 Arch == Triple::aarch64 ||
828 Arch == Triple::ppc || Arch == Triple::ppc64 ||
829 Arch == Triple::UnknownArch) &&
830 (TT.isOSDarwin() || TT.isOSBinFormatMachO())) {
832 InitMachOMCObjectFileInfo(TT);
833 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
834 Arch == Triple::arm || Arch == Triple::thumb) &&
835 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
837 InitCOFFMCObjectFileInfo(TT);
840 InitELFMCObjectFileInfo(TT);
844 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
845 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
846 SectionKind::getMetadata(), 0, utostr(Hash));
850 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
851 return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS,
852 ELF::SHF_GROUP, SectionKind::getMetadata(), 0,
856 void MCObjectFileInfo::InitEHFrameSection() {
859 Ctx->getMachOSection("__TEXT", "__eh_frame",
861 MachO::S_ATTR_NO_TOC |
862 MachO::S_ATTR_STRIP_STATIC_SYMS |
863 MachO::S_ATTR_LIVE_SUPPORT,
864 SectionKind::getReadOnly());
865 else if (Env == IsELF)
867 Ctx->getELFSection(".eh_frame", EHSectionType,
869 SectionKind::getDataRel());
872 Ctx->getCOFFSection(".eh_frame",
873 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
874 COFF::IMAGE_SCN_MEM_READ |
875 COFF::IMAGE_SCN_MEM_WRITE,
876 SectionKind::getDataRel());