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 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
53 SupportsCompactUnwindWithoutEHFrame = true;
56 OmitDwarfIfHaveCompactUnwind = true;
58 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
59 | dwarf::DW_EH_PE_sdata4;
60 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
61 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
62 dwarf::DW_EH_PE_sdata4;
64 // .comm doesn't support alignment before Leopard.
65 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
66 CommDirectiveSupportsAlignment = false;
69 = Ctx->getMachOSection("__TEXT", "__text",
70 MachO::S_ATTR_PURE_INSTRUCTIONS,
71 SectionKind::getText());
73 = Ctx->getMachOSection("__DATA", "__data", 0,
74 SectionKind::getDataRel());
76 // BSSSection might not be expected initialized on msvc.
79 TLSDataSection // .tdata
80 = Ctx->getMachOSection("__DATA", "__thread_data",
81 MachO::S_THREAD_LOCAL_REGULAR,
82 SectionKind::getDataRel());
83 TLSBSSSection // .tbss
84 = Ctx->getMachOSection("__DATA", "__thread_bss",
85 MachO::S_THREAD_LOCAL_ZEROFILL,
86 SectionKind::getThreadBSS());
88 // TODO: Verify datarel below.
90 = Ctx->getMachOSection("__DATA", "__thread_vars",
91 MachO::S_THREAD_LOCAL_VARIABLES,
92 SectionKind::getDataRel());
95 = Ctx->getMachOSection("__DATA", "__thread_init",
96 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
97 SectionKind::getDataRel());
99 CStringSection // .cstring
100 = Ctx->getMachOSection("__TEXT", "__cstring",
101 MachO::S_CSTRING_LITERALS,
102 SectionKind::getMergeable1ByteCString());
104 = Ctx->getMachOSection("__TEXT","__ustring", 0,
105 SectionKind::getMergeable2ByteCString());
106 FourByteConstantSection // .literal4
107 = Ctx->getMachOSection("__TEXT", "__literal4",
108 MachO::S_4BYTE_LITERALS,
109 SectionKind::getMergeableConst4());
110 EightByteConstantSection // .literal8
111 = Ctx->getMachOSection("__TEXT", "__literal8",
112 MachO::S_8BYTE_LITERALS,
113 SectionKind::getMergeableConst8());
115 SixteenByteConstantSection // .literal16
116 = Ctx->getMachOSection("__TEXT", "__literal16",
117 MachO::S_16BYTE_LITERALS,
118 SectionKind::getMergeableConst16());
120 ReadOnlySection // .const
121 = Ctx->getMachOSection("__TEXT", "__const", 0,
122 SectionKind::getReadOnly());
124 // If the target is not powerpc, map the coal sections to the non-coal
127 // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
128 // "__TEXT/__const_coal" => section "__TEXT/__const"
129 // "__DATA/__datacoal_nt" => section "__DATA/__data"
130 Triple::ArchType ArchTy = T.getArch();
132 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
134 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
136 MachO::S_ATTR_PURE_INSTRUCTIONS,
137 SectionKind::getText());
139 = Ctx->getMachOSection("__TEXT", "__const_coal",
141 SectionKind::getReadOnly());
143 = Ctx->getMachOSection("__DATA","__datacoal_nt",
145 SectionKind::getDataRel());
147 TextCoalSection = TextSection;
148 ConstTextCoalSection = ReadOnlySection;
149 DataCoalSection = DataSection;
152 ConstDataSection // .const_data
153 = Ctx->getMachOSection("__DATA", "__const", 0,
154 SectionKind::getReadOnlyWithRel());
156 = Ctx->getMachOSection("__DATA","__common",
158 SectionKind::getBSS());
160 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
161 SectionKind::getBSS());
164 LazySymbolPointerSection
165 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
166 MachO::S_LAZY_SYMBOL_POINTERS,
167 SectionKind::getMetadata());
168 NonLazySymbolPointerSection
169 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
170 MachO::S_NON_LAZY_SYMBOL_POINTERS,
171 SectionKind::getMetadata());
173 if (RelocM == Reloc::Static) {
175 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
176 SectionKind::getDataRel());
178 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
179 SectionKind::getDataRel());
182 = Ctx->getMachOSection("__DATA", "__mod_init_func",
183 MachO::S_MOD_INIT_FUNC_POINTERS,
184 SectionKind::getDataRel());
186 = Ctx->getMachOSection("__DATA", "__mod_term_func",
187 MachO::S_MOD_TERM_FUNC_POINTERS,
188 SectionKind::getDataRel());
191 // Exception Handling.
192 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
193 SectionKind::getReadOnlyWithRel());
195 COFFDebugSymbolsSection = nullptr;
197 if (useCompactUnwind(T)) {
198 CompactUnwindSection =
199 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
200 SectionKind::getReadOnly());
202 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
203 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF
204 else if (T.getArch() == Triple::aarch64)
205 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF
206 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
207 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF
210 // Debug Information.
211 DwarfAccelNamesSection =
212 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
213 SectionKind::getMetadata(), "names_begin");
214 DwarfAccelObjCSection =
215 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
216 SectionKind::getMetadata(), "objc_begin");
217 // 16 character section limit...
218 DwarfAccelNamespaceSection =
219 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
220 SectionKind::getMetadata(), "namespac_begin");
221 DwarfAccelTypesSection =
222 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
223 SectionKind::getMetadata(), "types_begin");
226 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
227 SectionKind::getMetadata(), "section_abbrev");
229 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
230 SectionKind::getMetadata(), "section_info");
232 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
233 SectionKind::getMetadata(), "section_line");
235 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
236 SectionKind::getMetadata());
237 DwarfPubNamesSection =
238 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
239 SectionKind::getMetadata());
240 DwarfPubTypesSection =
241 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
242 SectionKind::getMetadata());
243 DwarfGnuPubNamesSection =
244 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
245 SectionKind::getMetadata());
246 DwarfGnuPubTypesSection =
247 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
248 SectionKind::getMetadata());
250 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
251 SectionKind::getMetadata(), "info_string");
253 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
254 SectionKind::getMetadata(), "section_debug_loc");
255 DwarfARangesSection =
256 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
257 SectionKind::getMetadata());
259 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
260 SectionKind::getMetadata(), "debug_range");
261 DwarfDebugInlineSection =
262 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
263 SectionKind::getMetadata());
264 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
265 0, SectionKind::getMetadata());
267 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
268 0, SectionKind::getMetadata());
270 TLSExtraDataSection = TLSTLVSection;
273 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
274 switch (T.getArch()) {
277 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
280 case Triple::mips64el:
281 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
284 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
285 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
286 : dwarf::DW_EH_PE_sdata4);
289 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
293 switch (T.getArch()) {
297 case Triple::thumbeb:
298 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
300 // Fallthrough if not using EHABI
303 PersonalityEncoding = (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;
306 LSDAEncoding = (RelocM == Reloc::PIC_)
307 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
308 : dwarf::DW_EH_PE_absptr;
309 TTypeEncoding = (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;
314 if (RelocM == Reloc::PIC_) {
315 PersonalityEncoding = 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);
318 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
319 (CMModel == CodeModel::Small
320 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
321 TTypeEncoding = 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);
325 PersonalityEncoding =
326 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
327 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
328 LSDAEncoding = (CMModel == CodeModel::Small)
329 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
330 TTypeEncoding = (CMModel == CodeModel::Small)
331 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
334 case Triple::aarch64:
335 case Triple::aarch64_be:
336 // The small model guarantees static code/data size < 4GB, but not where it
337 // will be in memory. Most of these could end up >2GB away so even a signed
338 // pc-relative 32-bit address is insufficient, theoretically.
339 if (RelocM == Reloc::PIC_) {
340 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
341 dwarf::DW_EH_PE_sdata8;
342 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
343 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
344 dwarf::DW_EH_PE_sdata8;
346 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
347 LSDAEncoding = dwarf::DW_EH_PE_absptr;
348 TTypeEncoding = dwarf::DW_EH_PE_absptr;
354 case Triple::mips64el:
355 // MIPS uses indirect pointer to refer personality functions and types, so
356 // that the eh_frame section can be read-only. DW.ref.personality will be
357 // generated for relocation.
358 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
359 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
360 // identify N64 from just a triple.
361 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
362 dwarf::DW_EH_PE_sdata4;
363 // We don't support PC-relative LSDA references in GAS so we use the default
364 // DW_EH_PE_absptr for those.
367 case Triple::ppc64le:
368 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
369 dwarf::DW_EH_PE_udata8;
370 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
371 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
372 dwarf::DW_EH_PE_udata8;
374 case Triple::sparcel:
376 if (RelocM == Reloc::PIC_) {
377 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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 LSDAEncoding = dwarf::DW_EH_PE_absptr;
384 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
385 TTypeEncoding = dwarf::DW_EH_PE_absptr;
388 case Triple::sparcv9:
389 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
390 if (RelocM == Reloc::PIC_) {
391 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
392 dwarf::DW_EH_PE_sdata4;
393 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
394 dwarf::DW_EH_PE_sdata4;
396 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
397 TTypeEncoding = dwarf::DW_EH_PE_absptr;
400 case Triple::systemz:
401 // All currently-defined code models guarantee that 4-byte PC-relative
402 // values will be in range.
403 if (RelocM == Reloc::PIC_) {
404 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
405 dwarf::DW_EH_PE_sdata4;
406 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
407 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
408 dwarf::DW_EH_PE_sdata4;
410 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
411 LSDAEncoding = dwarf::DW_EH_PE_absptr;
412 TTypeEncoding = dwarf::DW_EH_PE_absptr;
419 // Solaris requires different flags for .eh_frame to seemingly every other
421 EHSectionType = ELF::SHT_PROGBITS;
422 EHSectionFlags = ELF::SHF_ALLOC;
423 if (T.isOSSolaris()) {
424 if (T.getArch() == Triple::x86_64)
425 EHSectionType = ELF::SHT_X86_64_UNWIND;
427 EHSectionFlags |= ELF::SHF_WRITE;
431 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
432 ELF::SHF_WRITE | ELF::SHF_ALLOC);
434 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
435 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
437 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
438 ELF::SHF_WRITE | ELF::SHF_ALLOC);
441 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
444 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
447 TLSBSSSection = Ctx->getELFSection(
448 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
450 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
451 ELF::SHF_ALLOC | ELF::SHF_WRITE);
453 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
454 ELF::SHF_ALLOC | ELF::SHF_WRITE);
456 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
457 ELF::SHF_ALLOC | ELF::SHF_WRITE);
459 DataRelROLocalSection = Ctx->getELFSection(
460 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
462 MergeableConst4Section =
463 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
464 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
466 MergeableConst8Section =
467 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
468 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
470 MergeableConst16Section =
471 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
472 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
474 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
475 ELF::SHF_ALLOC | ELF::SHF_WRITE);
477 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
478 ELF::SHF_ALLOC | ELF::SHF_WRITE);
480 // Exception Handling Sections.
482 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
483 // it contains relocatable pointers. In PIC mode, this is probably a big
484 // runtime hit for C++ apps. Either the contents of the LSDA need to be
485 // adjusted or this should be a data section.
486 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
489 COFFDebugSymbolsSection = nullptr;
491 // Debug Info Sections.
492 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
495 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
496 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
497 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
498 DwarfPubNamesSection =
499 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
500 DwarfPubTypesSection =
501 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
502 DwarfGnuPubNamesSection =
503 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
504 DwarfGnuPubTypesSection =
505 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
507 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
508 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
509 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
510 DwarfARangesSection =
511 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
513 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
515 // DWARF5 Experimental Debug Info
517 // Accelerator Tables
518 DwarfAccelNamesSection =
519 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
520 DwarfAccelObjCSection =
521 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
522 DwarfAccelNamespaceSection = Ctx->getELFSection(
523 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
524 DwarfAccelTypesSection =
525 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
528 DwarfInfoDWOSection =
529 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
530 DwarfTypesDWOSection =
531 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
532 DwarfAbbrevDWOSection =
533 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
535 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
536 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
537 DwarfLineDWOSection =
538 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
540 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
541 DwarfStrOffDWOSection =
542 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
544 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
547 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
550 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
553 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
554 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
556 CommDirectiveSupportsAlignment = true;
559 BSSSection = Ctx->getCOFFSection(
560 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
561 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
562 SectionKind::getBSS());
563 TextSection = Ctx->getCOFFSection(
565 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
566 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
567 COFF::IMAGE_SCN_MEM_READ,
568 SectionKind::getText());
569 DataSection = Ctx->getCOFFSection(
570 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
571 COFF::IMAGE_SCN_MEM_WRITE,
572 SectionKind::getDataRel());
573 ReadOnlySection = Ctx->getCOFFSection(
574 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
575 SectionKind::getReadOnly());
577 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
579 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
580 COFF::IMAGE_SCN_MEM_READ,
581 SectionKind::getReadOnly());
583 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
584 COFF::IMAGE_SCN_MEM_READ,
585 SectionKind::getReadOnly());
587 StaticCtorSection = Ctx->getCOFFSection(
588 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
589 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
590 SectionKind::getDataRel());
591 StaticDtorSection = Ctx->getCOFFSection(
592 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
593 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
594 SectionKind::getDataRel());
597 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
598 // though it contains relocatable pointers. In PIC mode, this is probably a
599 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
600 // adjusted or this should be a data section.
601 assert(T.isOSWindows() && "Windows is the only supported COFF target");
602 if (T.getArch() == Triple::x86_64) {
603 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
604 LSDASection = nullptr;
606 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
607 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
608 COFF::IMAGE_SCN_MEM_READ,
609 SectionKind::getReadOnly());
613 COFFDebugSymbolsSection =
614 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
615 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
616 COFF::IMAGE_SCN_MEM_READ,
617 SectionKind::getMetadata());
619 DwarfAbbrevSection = Ctx->getCOFFSection(
621 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
622 COFF::IMAGE_SCN_MEM_READ,
623 SectionKind::getMetadata(), "section_abbrev");
624 DwarfInfoSection = Ctx->getCOFFSection(
626 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
627 COFF::IMAGE_SCN_MEM_READ,
628 SectionKind::getMetadata(), "section_info");
629 DwarfLineSection = Ctx->getCOFFSection(
631 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
632 COFF::IMAGE_SCN_MEM_READ,
633 SectionKind::getMetadata(), "section_line");
635 DwarfFrameSection = Ctx->getCOFFSection(
637 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
638 COFF::IMAGE_SCN_MEM_READ,
639 SectionKind::getMetadata());
640 DwarfPubNamesSection = Ctx->getCOFFSection(
642 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
643 COFF::IMAGE_SCN_MEM_READ,
644 SectionKind::getMetadata());
645 DwarfPubTypesSection = Ctx->getCOFFSection(
647 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
648 COFF::IMAGE_SCN_MEM_READ,
649 SectionKind::getMetadata());
650 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
651 ".debug_gnu_pubnames",
652 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
653 COFF::IMAGE_SCN_MEM_READ,
654 SectionKind::getMetadata());
655 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
656 ".debug_gnu_pubtypes",
657 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
658 COFF::IMAGE_SCN_MEM_READ,
659 SectionKind::getMetadata());
660 DwarfStrSection = Ctx->getCOFFSection(
662 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
663 COFF::IMAGE_SCN_MEM_READ,
664 SectionKind::getMetadata(), "info_string");
665 DwarfLocSection = Ctx->getCOFFSection(
667 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
668 COFF::IMAGE_SCN_MEM_READ,
669 SectionKind::getMetadata(), "section_debug_loc");
670 DwarfARangesSection = Ctx->getCOFFSection(
672 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
673 COFF::IMAGE_SCN_MEM_READ,
674 SectionKind::getMetadata());
675 DwarfRangesSection = Ctx->getCOFFSection(
677 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
678 COFF::IMAGE_SCN_MEM_READ,
679 SectionKind::getMetadata(), "debug_range");
680 DwarfInfoDWOSection = Ctx->getCOFFSection(
682 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
683 COFF::IMAGE_SCN_MEM_READ,
684 SectionKind::getMetadata(), "section_info_dwo");
685 DwarfTypesDWOSection = Ctx->getCOFFSection(
687 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
688 COFF::IMAGE_SCN_MEM_READ,
689 SectionKind::getMetadata(), "section_types_dwo");
690 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
692 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
693 COFF::IMAGE_SCN_MEM_READ,
694 SectionKind::getMetadata(), "section_abbrev_dwo");
695 DwarfStrDWOSection = Ctx->getCOFFSection(
697 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
698 COFF::IMAGE_SCN_MEM_READ,
699 SectionKind::getMetadata(), "skel_string");
700 DwarfLineDWOSection = Ctx->getCOFFSection(
702 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
703 COFF::IMAGE_SCN_MEM_READ,
704 SectionKind::getMetadata());
705 DwarfLocDWOSection = Ctx->getCOFFSection(
707 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
708 COFF::IMAGE_SCN_MEM_READ,
709 SectionKind::getMetadata(), "skel_loc");
710 DwarfStrOffDWOSection = Ctx->getCOFFSection(
711 ".debug_str_offsets.dwo",
712 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
713 COFF::IMAGE_SCN_MEM_READ,
714 SectionKind::getMetadata());
715 DwarfAddrSection = Ctx->getCOFFSection(
717 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
718 COFF::IMAGE_SCN_MEM_READ,
719 SectionKind::getMetadata(), "addr_sec");
720 DwarfAccelNamesSection = Ctx->getCOFFSection(
722 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
723 COFF::IMAGE_SCN_MEM_READ,
724 SectionKind::getMetadata(), "names_begin");
725 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
727 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
728 COFF::IMAGE_SCN_MEM_READ,
729 SectionKind::getMetadata(), "namespac_begin");
730 DwarfAccelTypesSection = Ctx->getCOFFSection(
732 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
733 COFF::IMAGE_SCN_MEM_READ,
734 SectionKind::getMetadata(), "types_begin");
735 DwarfAccelObjCSection = Ctx->getCOFFSection(
737 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
738 COFF::IMAGE_SCN_MEM_READ,
739 SectionKind::getMetadata(), "objc_begin");
741 DrectveSection = Ctx->getCOFFSection(
742 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
743 SectionKind::getMetadata());
745 PDataSection = Ctx->getCOFFSection(
746 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
747 SectionKind::getDataRel());
749 XDataSection = Ctx->getCOFFSection(
750 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
751 SectionKind::getDataRel());
753 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
754 SectionKind::getMetadata());
756 TLSDataSection = Ctx->getCOFFSection(
757 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
758 COFF::IMAGE_SCN_MEM_WRITE,
759 SectionKind::getDataRel());
761 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
762 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
763 COFF::IMAGE_SCN_MEM_READ,
764 SectionKind::getReadOnly());
767 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
776 CommDirectiveSupportsAlignment = true;
777 SupportsWeakOmittedEHFrame = true;
778 SupportsCompactUnwindWithoutEHFrame = false;
779 OmitDwarfIfHaveCompactUnwind = false;
781 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
782 dwarf::DW_EH_PE_absptr;
784 CompactUnwindDwarfEHFrameOnly = 0;
786 EHFrameSection = nullptr; // Created on demand.
787 CompactUnwindSection = nullptr; // Used only by selected targets.
788 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
789 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
790 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
791 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
795 Triple::ArchType Arch = TT.getArch();
796 // FIXME: Checking for Arch here to filter out bogus triples such as
797 // cellspu-apple-darwin. Perhaps we should fix in Triple?
798 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
799 Arch == Triple::arm || Arch == Triple::thumb ||
800 Arch == Triple::aarch64 ||
801 Arch == Triple::ppc || Arch == Triple::ppc64 ||
802 Arch == Triple::UnknownArch) &&
803 TT.isOSBinFormatMachO()) {
805 initMachOMCObjectFileInfo(TT);
806 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
807 Arch == Triple::arm || Arch == Triple::thumb) &&
808 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
810 initCOFFMCObjectFileInfo(TT);
813 initELFMCObjectFileInfo(TT);
817 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
820 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
823 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
824 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
828 void MCObjectFileInfo::InitEHFrameSection() {
831 Ctx->getMachOSection("__TEXT", "__eh_frame",
833 MachO::S_ATTR_NO_TOC |
834 MachO::S_ATTR_STRIP_STATIC_SYMS |
835 MachO::S_ATTR_LIVE_SUPPORT,
836 SectionKind::getReadOnly());
837 else if (Env == IsELF)
839 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
842 Ctx->getCOFFSection(".eh_frame",
843 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
844 COFF::IMAGE_SCN_MEM_READ |
845 COFF::IMAGE_SCN_MEM_WRITE,
846 SectionKind::getDataRel());