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"
19 #include "llvm/Support/COFF.h"
23 static bool useCompactUnwind(const Triple &T) {
28 // aarch64 always has it.
29 if (T.getArch() == Triple::aarch64)
32 // armv7k always has it.
36 // Use it on newer version of OS X.
37 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
40 // And the iOS simulator.
42 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
48 void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
50 SupportsWeakOmittedEHFrame = false;
52 EHFrameSection = Ctx->getMachOSection(
53 "__TEXT", "__eh_frame",
54 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
55 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
56 SectionKind::getReadOnly());
58 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
59 SupportsCompactUnwindWithoutEHFrame = true;
62 OmitDwarfIfHaveCompactUnwind = true;
64 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
65 | dwarf::DW_EH_PE_sdata4;
66 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
67 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
68 dwarf::DW_EH_PE_sdata4;
70 // .comm doesn't support alignment before Leopard.
71 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
72 CommDirectiveSupportsAlignment = false;
75 = Ctx->getMachOSection("__TEXT", "__text",
76 MachO::S_ATTR_PURE_INSTRUCTIONS,
77 SectionKind::getText());
79 = Ctx->getMachOSection("__DATA", "__data", 0,
80 SectionKind::getDataRel());
82 // BSSSection might not be expected initialized on msvc.
85 TLSDataSection // .tdata
86 = Ctx->getMachOSection("__DATA", "__thread_data",
87 MachO::S_THREAD_LOCAL_REGULAR,
88 SectionKind::getDataRel());
89 TLSBSSSection // .tbss
90 = Ctx->getMachOSection("__DATA", "__thread_bss",
91 MachO::S_THREAD_LOCAL_ZEROFILL,
92 SectionKind::getThreadBSS());
94 // TODO: Verify datarel below.
96 = Ctx->getMachOSection("__DATA", "__thread_vars",
97 MachO::S_THREAD_LOCAL_VARIABLES,
98 SectionKind::getDataRel());
101 = Ctx->getMachOSection("__DATA", "__thread_init",
102 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
103 SectionKind::getDataRel());
105 CStringSection // .cstring
106 = Ctx->getMachOSection("__TEXT", "__cstring",
107 MachO::S_CSTRING_LITERALS,
108 SectionKind::getMergeable1ByteCString());
110 = Ctx->getMachOSection("__TEXT","__ustring", 0,
111 SectionKind::getMergeable2ByteCString());
112 FourByteConstantSection // .literal4
113 = Ctx->getMachOSection("__TEXT", "__literal4",
114 MachO::S_4BYTE_LITERALS,
115 SectionKind::getMergeableConst4());
116 EightByteConstantSection // .literal8
117 = Ctx->getMachOSection("__TEXT", "__literal8",
118 MachO::S_8BYTE_LITERALS,
119 SectionKind::getMergeableConst8());
121 SixteenByteConstantSection // .literal16
122 = Ctx->getMachOSection("__TEXT", "__literal16",
123 MachO::S_16BYTE_LITERALS,
124 SectionKind::getMergeableConst16());
126 ReadOnlySection // .const
127 = Ctx->getMachOSection("__TEXT", "__const", 0,
128 SectionKind::getReadOnly());
130 // If the target is not powerpc, map the coal sections to the non-coal
133 // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
134 // "__TEXT/__const_coal" => section "__TEXT/__const"
135 // "__DATA/__datacoal_nt" => section "__DATA/__data"
136 Triple::ArchType ArchTy = T.getArch();
138 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
140 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
142 MachO::S_ATTR_PURE_INSTRUCTIONS,
143 SectionKind::getText());
145 = Ctx->getMachOSection("__TEXT", "__const_coal",
147 SectionKind::getReadOnly());
149 = Ctx->getMachOSection("__DATA","__datacoal_nt",
151 SectionKind::getDataRel());
153 TextCoalSection = TextSection;
154 ConstTextCoalSection = ReadOnlySection;
155 DataCoalSection = DataSection;
158 ConstDataSection // .const_data
159 = Ctx->getMachOSection("__DATA", "__const", 0,
160 SectionKind::getReadOnlyWithRel());
162 = Ctx->getMachOSection("__DATA","__common",
164 SectionKind::getBSS());
166 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
167 SectionKind::getBSS());
170 LazySymbolPointerSection
171 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
172 MachO::S_LAZY_SYMBOL_POINTERS,
173 SectionKind::getMetadata());
174 NonLazySymbolPointerSection
175 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
176 MachO::S_NON_LAZY_SYMBOL_POINTERS,
177 SectionKind::getMetadata());
179 if (RelocM == Reloc::Static) {
181 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
182 SectionKind::getDataRel());
184 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
185 SectionKind::getDataRel());
188 = Ctx->getMachOSection("__DATA", "__mod_init_func",
189 MachO::S_MOD_INIT_FUNC_POINTERS,
190 SectionKind::getDataRel());
192 = Ctx->getMachOSection("__DATA", "__mod_term_func",
193 MachO::S_MOD_TERM_FUNC_POINTERS,
194 SectionKind::getDataRel());
197 // Exception Handling.
198 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
199 SectionKind::getReadOnlyWithRel());
201 COFFDebugSymbolsSection = nullptr;
203 if (useCompactUnwind(T)) {
204 CompactUnwindSection =
205 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
206 SectionKind::getReadOnly());
208 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
209 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF
210 else if (T.getArch() == Triple::aarch64)
211 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF
212 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
213 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF
216 // Debug Information.
217 DwarfAccelNamesSection =
218 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
219 SectionKind::getMetadata(), "names_begin");
220 DwarfAccelObjCSection =
221 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
222 SectionKind::getMetadata(), "objc_begin");
223 // 16 character section limit...
224 DwarfAccelNamespaceSection =
225 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
226 SectionKind::getMetadata(), "namespac_begin");
227 DwarfAccelTypesSection =
228 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
229 SectionKind::getMetadata(), "types_begin");
232 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
233 SectionKind::getMetadata(), "section_abbrev");
235 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
236 SectionKind::getMetadata(), "section_info");
238 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
239 SectionKind::getMetadata(), "section_line");
241 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
242 SectionKind::getMetadata());
243 DwarfPubNamesSection =
244 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
245 SectionKind::getMetadata());
246 DwarfPubTypesSection =
247 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
248 SectionKind::getMetadata());
249 DwarfGnuPubNamesSection =
250 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
251 SectionKind::getMetadata());
252 DwarfGnuPubTypesSection =
253 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
254 SectionKind::getMetadata());
256 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
257 SectionKind::getMetadata(), "info_string");
259 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
260 SectionKind::getMetadata(), "section_debug_loc");
261 DwarfARangesSection =
262 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
263 SectionKind::getMetadata());
265 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
266 SectionKind::getMetadata(), "debug_range");
267 DwarfDebugInlineSection =
268 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
269 SectionKind::getMetadata());
270 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
271 0, SectionKind::getMetadata());
273 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
274 0, SectionKind::getMetadata());
276 TLSExtraDataSection = TLSTLVSection;
279 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
280 switch (T.getArch()) {
283 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
286 case Triple::mips64el:
287 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
290 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
291 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
292 : dwarf::DW_EH_PE_sdata4);
295 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
299 switch (T.getArch()) {
303 case Triple::thumbeb:
304 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
306 // Fallthrough if not using EHABI
309 PersonalityEncoding = (RelocM == Reloc::PIC_)
310 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
311 : dwarf::DW_EH_PE_absptr;
312 LSDAEncoding = (RelocM == Reloc::PIC_)
313 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
314 : dwarf::DW_EH_PE_absptr;
315 TTypeEncoding = (RelocM == Reloc::PIC_)
316 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
317 : dwarf::DW_EH_PE_absptr;
320 if (RelocM == Reloc::PIC_) {
321 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
322 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
323 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
324 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
325 (CMModel == CodeModel::Small
326 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
327 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
328 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
329 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
331 PersonalityEncoding =
332 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
333 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
334 LSDAEncoding = (CMModel == CodeModel::Small)
335 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
336 TTypeEncoding = (CMModel == CodeModel::Small)
337 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
340 case Triple::aarch64:
341 case Triple::aarch64_be:
342 // The small model guarantees static code/data size < 4GB, but not where it
343 // will be in memory. Most of these could end up >2GB away so even a signed
344 // pc-relative 32-bit address is insufficient, theoretically.
345 if (RelocM == Reloc::PIC_) {
346 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
347 dwarf::DW_EH_PE_sdata8;
348 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
349 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
350 dwarf::DW_EH_PE_sdata8;
352 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
353 LSDAEncoding = dwarf::DW_EH_PE_absptr;
354 TTypeEncoding = dwarf::DW_EH_PE_absptr;
360 case Triple::mips64el:
361 // MIPS uses indirect pointer to refer personality functions and types, so
362 // that the eh_frame section can be read-only. DW.ref.personality will be
363 // generated for relocation.
364 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
365 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
366 // identify N64 from just a triple.
367 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
368 dwarf::DW_EH_PE_sdata4;
369 // We don't support PC-relative LSDA references in GAS so we use the default
370 // DW_EH_PE_absptr for those.
373 case Triple::ppc64le:
374 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
375 dwarf::DW_EH_PE_udata8;
376 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
377 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
378 dwarf::DW_EH_PE_udata8;
380 case Triple::sparcel:
382 if (RelocM == Reloc::PIC_) {
383 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
384 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
385 dwarf::DW_EH_PE_sdata4;
386 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
387 dwarf::DW_EH_PE_sdata4;
389 LSDAEncoding = dwarf::DW_EH_PE_absptr;
390 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
391 TTypeEncoding = dwarf::DW_EH_PE_absptr;
394 case Triple::sparcv9:
395 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
396 if (RelocM == Reloc::PIC_) {
397 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
398 dwarf::DW_EH_PE_sdata4;
399 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
400 dwarf::DW_EH_PE_sdata4;
402 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
403 TTypeEncoding = dwarf::DW_EH_PE_absptr;
406 case Triple::systemz:
407 // All currently-defined code models guarantee that 4-byte PC-relative
408 // values will be in range.
409 if (RelocM == Reloc::PIC_) {
410 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
411 dwarf::DW_EH_PE_sdata4;
412 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
413 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
414 dwarf::DW_EH_PE_sdata4;
416 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
417 LSDAEncoding = dwarf::DW_EH_PE_absptr;
418 TTypeEncoding = dwarf::DW_EH_PE_absptr;
425 unsigned EHSectionType = T.getArch() == Triple::x86_64
426 ? ELF::SHT_X86_64_UNWIND
429 // Solaris requires different flags for .eh_frame to seemingly every other
431 unsigned EHSectionFlags = ELF::SHF_ALLOC;
432 if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
433 EHSectionFlags |= ELF::SHF_WRITE;
436 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
437 ELF::SHF_WRITE | ELF::SHF_ALLOC);
439 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
440 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
442 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
443 ELF::SHF_WRITE | ELF::SHF_ALLOC);
446 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
449 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
450 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
452 TLSBSSSection = Ctx->getELFSection(
453 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
455 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
456 ELF::SHF_ALLOC | ELF::SHF_WRITE);
458 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
459 ELF::SHF_ALLOC | ELF::SHF_WRITE);
461 MergeableConst4Section =
462 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
463 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
465 MergeableConst8Section =
466 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
467 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
469 MergeableConst16Section =
470 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
471 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
473 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
474 ELF::SHF_ALLOC | ELF::SHF_WRITE);
476 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
477 ELF::SHF_ALLOC | ELF::SHF_WRITE);
479 // Exception Handling Sections.
481 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
482 // it contains relocatable pointers. In PIC mode, this is probably a big
483 // runtime hit for C++ apps. Either the contents of the LSDA need to be
484 // adjusted or this should be a data section.
485 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
488 COFFDebugSymbolsSection = nullptr;
490 // Debug Info Sections.
491 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
494 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
495 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
496 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
497 DwarfPubNamesSection =
498 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
499 DwarfPubTypesSection =
500 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
501 DwarfGnuPubNamesSection =
502 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
503 DwarfGnuPubTypesSection =
504 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
506 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
507 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
508 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
509 DwarfARangesSection =
510 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
512 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
514 // DWARF5 Experimental Debug Info
516 // Accelerator Tables
517 DwarfAccelNamesSection =
518 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
519 DwarfAccelObjCSection =
520 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
521 DwarfAccelNamespaceSection = Ctx->getELFSection(
522 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
523 DwarfAccelTypesSection =
524 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
527 DwarfInfoDWOSection =
528 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
529 DwarfTypesDWOSection =
530 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
531 DwarfAbbrevDWOSection =
532 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
534 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
535 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
536 DwarfLineDWOSection =
537 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
539 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
540 DwarfStrOffDWOSection =
541 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
543 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
546 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
549 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
552 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
555 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
556 EHFrameSection = Ctx->getCOFFSection(
557 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
558 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
559 SectionKind::getDataRel());
561 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
563 CommDirectiveSupportsAlignment = true;
566 BSSSection = Ctx->getCOFFSection(
567 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
568 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
569 SectionKind::getBSS());
570 TextSection = Ctx->getCOFFSection(
572 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
573 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
574 COFF::IMAGE_SCN_MEM_READ,
575 SectionKind::getText());
576 DataSection = Ctx->getCOFFSection(
577 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
578 COFF::IMAGE_SCN_MEM_WRITE,
579 SectionKind::getDataRel());
580 ReadOnlySection = Ctx->getCOFFSection(
581 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
582 SectionKind::getReadOnly());
584 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
586 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
587 COFF::IMAGE_SCN_MEM_READ,
588 SectionKind::getReadOnly());
590 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
591 COFF::IMAGE_SCN_MEM_READ,
592 SectionKind::getReadOnly());
594 StaticCtorSection = Ctx->getCOFFSection(
595 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
596 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
597 SectionKind::getDataRel());
598 StaticDtorSection = Ctx->getCOFFSection(
599 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
600 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
601 SectionKind::getDataRel());
604 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
605 // though it contains relocatable pointers. In PIC mode, this is probably a
606 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
607 // adjusted or this should be a data section.
608 assert(T.isOSWindows() && "Windows is the only supported COFF target");
609 if (T.getArch() == Triple::x86_64) {
610 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
611 LSDASection = nullptr;
613 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
614 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
615 COFF::IMAGE_SCN_MEM_READ,
616 SectionKind::getReadOnly());
620 COFFDebugSymbolsSection =
621 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
622 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
623 COFF::IMAGE_SCN_MEM_READ,
624 SectionKind::getMetadata());
626 DwarfAbbrevSection = Ctx->getCOFFSection(
628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
629 COFF::IMAGE_SCN_MEM_READ,
630 SectionKind::getMetadata(), "section_abbrev");
631 DwarfInfoSection = Ctx->getCOFFSection(
633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
634 COFF::IMAGE_SCN_MEM_READ,
635 SectionKind::getMetadata(), "section_info");
636 DwarfLineSection = Ctx->getCOFFSection(
638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ,
640 SectionKind::getMetadata(), "section_line");
642 DwarfFrameSection = Ctx->getCOFFSection(
644 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
645 COFF::IMAGE_SCN_MEM_READ,
646 SectionKind::getMetadata());
647 DwarfPubNamesSection = Ctx->getCOFFSection(
649 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
650 COFF::IMAGE_SCN_MEM_READ,
651 SectionKind::getMetadata());
652 DwarfPubTypesSection = Ctx->getCOFFSection(
654 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
655 COFF::IMAGE_SCN_MEM_READ,
656 SectionKind::getMetadata());
657 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
658 ".debug_gnu_pubnames",
659 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
660 COFF::IMAGE_SCN_MEM_READ,
661 SectionKind::getMetadata());
662 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
663 ".debug_gnu_pubtypes",
664 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
665 COFF::IMAGE_SCN_MEM_READ,
666 SectionKind::getMetadata());
667 DwarfStrSection = Ctx->getCOFFSection(
669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
670 COFF::IMAGE_SCN_MEM_READ,
671 SectionKind::getMetadata(), "info_string");
672 DwarfLocSection = Ctx->getCOFFSection(
674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
675 COFF::IMAGE_SCN_MEM_READ,
676 SectionKind::getMetadata(), "section_debug_loc");
677 DwarfARangesSection = Ctx->getCOFFSection(
679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
680 COFF::IMAGE_SCN_MEM_READ,
681 SectionKind::getMetadata());
682 DwarfRangesSection = Ctx->getCOFFSection(
684 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
685 COFF::IMAGE_SCN_MEM_READ,
686 SectionKind::getMetadata(), "debug_range");
687 DwarfInfoDWOSection = Ctx->getCOFFSection(
689 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
690 COFF::IMAGE_SCN_MEM_READ,
691 SectionKind::getMetadata(), "section_info_dwo");
692 DwarfTypesDWOSection = Ctx->getCOFFSection(
694 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
695 COFF::IMAGE_SCN_MEM_READ,
696 SectionKind::getMetadata(), "section_types_dwo");
697 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
699 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
700 COFF::IMAGE_SCN_MEM_READ,
701 SectionKind::getMetadata(), "section_abbrev_dwo");
702 DwarfStrDWOSection = Ctx->getCOFFSection(
704 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
705 COFF::IMAGE_SCN_MEM_READ,
706 SectionKind::getMetadata(), "skel_string");
707 DwarfLineDWOSection = Ctx->getCOFFSection(
709 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
710 COFF::IMAGE_SCN_MEM_READ,
711 SectionKind::getMetadata());
712 DwarfLocDWOSection = Ctx->getCOFFSection(
714 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
715 COFF::IMAGE_SCN_MEM_READ,
716 SectionKind::getMetadata(), "skel_loc");
717 DwarfStrOffDWOSection = Ctx->getCOFFSection(
718 ".debug_str_offsets.dwo",
719 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
720 COFF::IMAGE_SCN_MEM_READ,
721 SectionKind::getMetadata());
722 DwarfAddrSection = Ctx->getCOFFSection(
724 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
725 COFF::IMAGE_SCN_MEM_READ,
726 SectionKind::getMetadata(), "addr_sec");
727 DwarfAccelNamesSection = Ctx->getCOFFSection(
729 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
730 COFF::IMAGE_SCN_MEM_READ,
731 SectionKind::getMetadata(), "names_begin");
732 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
734 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
735 COFF::IMAGE_SCN_MEM_READ,
736 SectionKind::getMetadata(), "namespac_begin");
737 DwarfAccelTypesSection = Ctx->getCOFFSection(
739 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
740 COFF::IMAGE_SCN_MEM_READ,
741 SectionKind::getMetadata(), "types_begin");
742 DwarfAccelObjCSection = Ctx->getCOFFSection(
744 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
745 COFF::IMAGE_SCN_MEM_READ,
746 SectionKind::getMetadata(), "objc_begin");
748 DrectveSection = Ctx->getCOFFSection(
749 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
750 SectionKind::getMetadata());
752 PDataSection = Ctx->getCOFFSection(
753 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
754 SectionKind::getDataRel());
756 XDataSection = Ctx->getCOFFSection(
757 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
758 SectionKind::getDataRel());
760 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
761 SectionKind::getMetadata());
763 TLSDataSection = Ctx->getCOFFSection(
764 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
765 COFF::IMAGE_SCN_MEM_WRITE,
766 SectionKind::getDataRel());
768 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
769 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
770 COFF::IMAGE_SCN_MEM_READ,
771 SectionKind::getReadOnly());
774 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
783 CommDirectiveSupportsAlignment = true;
784 SupportsWeakOmittedEHFrame = true;
785 SupportsCompactUnwindWithoutEHFrame = false;
786 OmitDwarfIfHaveCompactUnwind = false;
788 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
789 dwarf::DW_EH_PE_absptr;
791 CompactUnwindDwarfEHFrameOnly = 0;
793 EHFrameSection = nullptr; // Created on demand.
794 CompactUnwindSection = nullptr; // Used only by selected targets.
795 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
796 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
797 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
798 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
802 Triple::ArchType Arch = TT.getArch();
803 // FIXME: Checking for Arch here to filter out bogus triples such as
804 // cellspu-apple-darwin. Perhaps we should fix in Triple?
805 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
806 Arch == Triple::arm || Arch == Triple::thumb ||
807 Arch == Triple::aarch64 ||
808 Arch == Triple::ppc || Arch == Triple::ppc64 ||
809 Arch == Triple::UnknownArch) &&
810 TT.isOSBinFormatMachO()) {
812 initMachOMCObjectFileInfo(TT);
813 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
814 Arch == Triple::arm || Arch == Triple::thumb) &&
815 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
817 initCOFFMCObjectFileInfo(TT);
820 initELFMCObjectFileInfo(TT);
824 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
827 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
830 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
831 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,