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 // Use it on newer version of OS X.
33 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
36 // And the iOS simulator.
38 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
44 void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
46 SupportsWeakOmittedEHFrame = false;
48 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
49 SupportsCompactUnwindWithoutEHFrame = true;
51 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
52 | dwarf::DW_EH_PE_sdata4;
53 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
54 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
55 dwarf::DW_EH_PE_sdata4;
57 // .comm doesn't support alignment before Leopard.
58 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
59 CommDirectiveSupportsAlignment = false;
62 = Ctx->getMachOSection("__TEXT", "__text",
63 MachO::S_ATTR_PURE_INSTRUCTIONS,
64 SectionKind::getText());
66 = Ctx->getMachOSection("__DATA", "__data", 0,
67 SectionKind::getDataRel());
69 // BSSSection might not be expected initialized on msvc.
72 TLSDataSection // .tdata
73 = Ctx->getMachOSection("__DATA", "__thread_data",
74 MachO::S_THREAD_LOCAL_REGULAR,
75 SectionKind::getDataRel());
76 TLSBSSSection // .tbss
77 = Ctx->getMachOSection("__DATA", "__thread_bss",
78 MachO::S_THREAD_LOCAL_ZEROFILL,
79 SectionKind::getThreadBSS());
81 // TODO: Verify datarel below.
83 = Ctx->getMachOSection("__DATA", "__thread_vars",
84 MachO::S_THREAD_LOCAL_VARIABLES,
85 SectionKind::getDataRel());
88 = Ctx->getMachOSection("__DATA", "__thread_init",
89 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
90 SectionKind::getDataRel());
92 CStringSection // .cstring
93 = Ctx->getMachOSection("__TEXT", "__cstring",
94 MachO::S_CSTRING_LITERALS,
95 SectionKind::getMergeable1ByteCString());
97 = Ctx->getMachOSection("__TEXT","__ustring", 0,
98 SectionKind::getMergeable2ByteCString());
99 FourByteConstantSection // .literal4
100 = Ctx->getMachOSection("__TEXT", "__literal4",
101 MachO::S_4BYTE_LITERALS,
102 SectionKind::getMergeableConst4());
103 EightByteConstantSection // .literal8
104 = Ctx->getMachOSection("__TEXT", "__literal8",
105 MachO::S_8BYTE_LITERALS,
106 SectionKind::getMergeableConst8());
108 SixteenByteConstantSection // .literal16
109 = Ctx->getMachOSection("__TEXT", "__literal16",
110 MachO::S_16BYTE_LITERALS,
111 SectionKind::getMergeableConst16());
113 ReadOnlySection // .const
114 = Ctx->getMachOSection("__TEXT", "__const", 0,
115 SectionKind::getReadOnly());
117 // If the target is not powerpc, map the coal sections to the non-coal
120 // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
121 // "__TEXT/__const_coal" => section "__TEXT/__const"
122 // "__DATA/__datacoal_nt" => section "__DATA/__data"
123 Triple::ArchType ArchTy = T.getArch();
125 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
127 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
129 MachO::S_ATTR_PURE_INSTRUCTIONS,
130 SectionKind::getText());
132 = Ctx->getMachOSection("__TEXT", "__const_coal",
134 SectionKind::getReadOnly());
136 = Ctx->getMachOSection("__DATA","__datacoal_nt",
138 SectionKind::getDataRel());
140 TextCoalSection = TextSection;
141 ConstTextCoalSection = ReadOnlySection;
142 DataCoalSection = DataSection;
145 ConstDataSection // .const_data
146 = Ctx->getMachOSection("__DATA", "__const", 0,
147 SectionKind::getReadOnlyWithRel());
149 = Ctx->getMachOSection("__DATA","__common",
151 SectionKind::getBSS());
153 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
154 SectionKind::getBSS());
157 LazySymbolPointerSection
158 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
159 MachO::S_LAZY_SYMBOL_POINTERS,
160 SectionKind::getMetadata());
161 NonLazySymbolPointerSection
162 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
163 MachO::S_NON_LAZY_SYMBOL_POINTERS,
164 SectionKind::getMetadata());
166 if (RelocM == Reloc::Static) {
168 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
169 SectionKind::getDataRel());
171 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
172 SectionKind::getDataRel());
175 = Ctx->getMachOSection("__DATA", "__mod_init_func",
176 MachO::S_MOD_INIT_FUNC_POINTERS,
177 SectionKind::getDataRel());
179 = Ctx->getMachOSection("__DATA", "__mod_term_func",
180 MachO::S_MOD_TERM_FUNC_POINTERS,
181 SectionKind::getDataRel());
184 // Exception Handling.
185 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
186 SectionKind::getReadOnlyWithRel());
188 COFFDebugSymbolsSection = nullptr;
190 if (useCompactUnwind(T)) {
191 CompactUnwindSection =
192 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
193 SectionKind::getReadOnly());
195 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
196 CompactUnwindDwarfEHFrameOnly = 0x04000000;
197 else if (T.getArch() == Triple::aarch64)
198 CompactUnwindDwarfEHFrameOnly = 0x03000000;
201 // Debug Information.
202 DwarfAccelNamesSection =
203 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
204 SectionKind::getMetadata(), "names_begin");
205 DwarfAccelObjCSection =
206 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
207 SectionKind::getMetadata(), "objc_begin");
208 // 16 character section limit...
209 DwarfAccelNamespaceSection =
210 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
211 SectionKind::getMetadata(), "namespac_begin");
212 DwarfAccelTypesSection =
213 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
214 SectionKind::getMetadata(), "types_begin");
217 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
218 SectionKind::getMetadata(), "section_abbrev");
220 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
221 SectionKind::getMetadata(), "section_info");
223 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
224 SectionKind::getMetadata(), "section_line");
226 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
227 SectionKind::getMetadata());
228 DwarfPubNamesSection =
229 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
230 SectionKind::getMetadata());
231 DwarfPubTypesSection =
232 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
233 SectionKind::getMetadata());
234 DwarfGnuPubNamesSection =
235 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
236 SectionKind::getMetadata());
237 DwarfGnuPubTypesSection =
238 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
239 SectionKind::getMetadata());
241 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
242 SectionKind::getMetadata(), "info_string");
244 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
245 SectionKind::getMetadata(), "section_debug_loc");
246 DwarfARangesSection =
247 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
248 SectionKind::getMetadata());
250 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
251 SectionKind::getMetadata(), "debug_range");
252 DwarfDebugInlineSection =
253 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
254 SectionKind::getMetadata());
255 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
256 0, SectionKind::getMetadata());
258 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
259 0, SectionKind::getMetadata());
261 TLSExtraDataSection = TLSTLVSection;
264 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
265 switch (T.getArch()) {
268 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
271 case Triple::mips64el:
272 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
275 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
276 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
277 : dwarf::DW_EH_PE_sdata4);
280 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
284 switch (T.getArch()) {
288 case Triple::thumbeb:
289 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
291 // Fallthrough if not using EHABI
294 PersonalityEncoding = (RelocM == Reloc::PIC_)
295 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
296 : dwarf::DW_EH_PE_absptr;
297 LSDAEncoding = (RelocM == Reloc::PIC_)
298 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
299 : dwarf::DW_EH_PE_absptr;
300 TTypeEncoding = (RelocM == Reloc::PIC_)
301 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
302 : dwarf::DW_EH_PE_absptr;
305 if (RelocM == Reloc::PIC_) {
306 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
307 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
308 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
309 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
310 (CMModel == CodeModel::Small
311 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
312 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
313 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
314 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
316 PersonalityEncoding =
317 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
318 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
319 LSDAEncoding = (CMModel == CodeModel::Small)
320 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
321 TTypeEncoding = (CMModel == CodeModel::Small)
322 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
325 case Triple::aarch64:
326 case Triple::aarch64_be:
327 // The small model guarantees static code/data size < 4GB, but not where it
328 // will be in memory. Most of these could end up >2GB away so even a signed
329 // pc-relative 32-bit address is insufficient, theoretically.
330 if (RelocM == Reloc::PIC_) {
331 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
332 dwarf::DW_EH_PE_sdata8;
333 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
334 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
335 dwarf::DW_EH_PE_sdata8;
337 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
338 LSDAEncoding = dwarf::DW_EH_PE_absptr;
339 TTypeEncoding = dwarf::DW_EH_PE_absptr;
345 case Triple::mips64el:
346 // MIPS uses indirect pointer to refer personality functions and types, so
347 // that the eh_frame section can be read-only. DW.ref.personality will be
348 // generated for relocation.
349 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
350 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
351 // identify N64 from just a triple.
352 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
353 dwarf::DW_EH_PE_sdata4;
354 // We don't support PC-relative LSDA references in GAS so we use the default
355 // DW_EH_PE_absptr for those.
358 case Triple::ppc64le:
359 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
360 dwarf::DW_EH_PE_udata8;
361 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
362 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
363 dwarf::DW_EH_PE_udata8;
365 case Triple::sparcel:
367 if (RelocM == Reloc::PIC_) {
368 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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 LSDAEncoding = dwarf::DW_EH_PE_absptr;
375 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
376 TTypeEncoding = dwarf::DW_EH_PE_absptr;
379 case Triple::sparcv9:
380 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
381 if (RelocM == Reloc::PIC_) {
382 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
383 dwarf::DW_EH_PE_sdata4;
384 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
385 dwarf::DW_EH_PE_sdata4;
387 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
388 TTypeEncoding = dwarf::DW_EH_PE_absptr;
391 case Triple::systemz:
392 // All currently-defined code models guarantee that 4-byte PC-relative
393 // values will be in range.
394 if (RelocM == Reloc::PIC_) {
395 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
396 dwarf::DW_EH_PE_sdata4;
397 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
398 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
399 dwarf::DW_EH_PE_sdata4;
401 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
402 LSDAEncoding = dwarf::DW_EH_PE_absptr;
403 TTypeEncoding = dwarf::DW_EH_PE_absptr;
410 // Solaris requires different flags for .eh_frame to seemingly every other
412 EHSectionType = ELF::SHT_PROGBITS;
413 EHSectionFlags = ELF::SHF_ALLOC;
414 if (T.isOSSolaris()) {
415 if (T.getArch() == Triple::x86_64)
416 EHSectionType = ELF::SHT_X86_64_UNWIND;
418 EHSectionFlags |= ELF::SHF_WRITE;
422 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
423 ELF::SHF_WRITE | ELF::SHF_ALLOC);
425 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
426 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
428 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
429 ELF::SHF_WRITE | ELF::SHF_ALLOC);
432 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
435 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
436 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
438 TLSBSSSection = Ctx->getELFSection(
439 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
441 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
442 ELF::SHF_ALLOC | ELF::SHF_WRITE);
444 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC | ELF::SHF_WRITE);
447 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
448 ELF::SHF_ALLOC | ELF::SHF_WRITE);
450 DataRelROLocalSection = Ctx->getELFSection(
451 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
453 MergeableConst4Section =
454 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
455 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
457 MergeableConst8Section =
458 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
459 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
461 MergeableConst16Section =
462 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
463 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
465 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
466 ELF::SHF_ALLOC | ELF::SHF_WRITE);
468 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
469 ELF::SHF_ALLOC | ELF::SHF_WRITE);
471 // Exception Handling Sections.
473 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
474 // it contains relocatable pointers. In PIC mode, this is probably a big
475 // runtime hit for C++ apps. Either the contents of the LSDA need to be
476 // adjusted or this should be a data section.
477 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
480 COFFDebugSymbolsSection = nullptr;
482 // Debug Info Sections.
483 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
486 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
487 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
488 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
489 DwarfPubNamesSection =
490 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
491 DwarfPubTypesSection =
492 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
493 DwarfGnuPubNamesSection =
494 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
495 DwarfGnuPubTypesSection =
496 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
498 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
499 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
500 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
501 DwarfARangesSection =
502 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
504 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
506 // DWARF5 Experimental Debug Info
508 // Accelerator Tables
509 DwarfAccelNamesSection =
510 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
511 DwarfAccelObjCSection =
512 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
513 DwarfAccelNamespaceSection = Ctx->getELFSection(
514 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
515 DwarfAccelTypesSection =
516 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
519 DwarfInfoDWOSection =
520 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
521 DwarfTypesDWOSection =
522 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
523 DwarfAbbrevDWOSection =
524 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
526 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
527 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
528 DwarfLineDWOSection =
529 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
531 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
532 DwarfStrOffDWOSection =
533 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
535 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
538 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
541 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
544 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
545 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
547 CommDirectiveSupportsAlignment = true;
550 BSSSection = Ctx->getCOFFSection(
551 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
552 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
553 SectionKind::getBSS());
554 TextSection = Ctx->getCOFFSection(
556 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
557 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
558 COFF::IMAGE_SCN_MEM_READ,
559 SectionKind::getText());
560 DataSection = Ctx->getCOFFSection(
561 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
562 COFF::IMAGE_SCN_MEM_WRITE,
563 SectionKind::getDataRel());
564 ReadOnlySection = Ctx->getCOFFSection(
565 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
566 SectionKind::getReadOnly());
568 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
570 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
571 COFF::IMAGE_SCN_MEM_READ,
572 SectionKind::getReadOnly());
574 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
575 COFF::IMAGE_SCN_MEM_READ,
576 SectionKind::getReadOnly());
578 StaticCtorSection = Ctx->getCOFFSection(
579 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
580 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
581 SectionKind::getDataRel());
582 StaticDtorSection = Ctx->getCOFFSection(
583 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
584 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
585 SectionKind::getDataRel());
588 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
589 // though it contains relocatable pointers. In PIC mode, this is probably a
590 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
591 // adjusted or this should be a data section.
592 assert(T.isOSWindows() && "Windows is the only supported COFF target");
593 if (T.getArch() == Triple::x86_64) {
594 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
595 LSDASection = nullptr;
597 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
598 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
599 COFF::IMAGE_SCN_MEM_READ,
600 SectionKind::getReadOnly());
604 COFFDebugSymbolsSection =
605 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
606 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
607 COFF::IMAGE_SCN_MEM_READ,
608 SectionKind::getMetadata());
610 DwarfAbbrevSection = Ctx->getCOFFSection(
612 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
613 COFF::IMAGE_SCN_MEM_READ,
614 SectionKind::getMetadata(), "section_abbrev");
615 DwarfInfoSection = Ctx->getCOFFSection(
617 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
618 COFF::IMAGE_SCN_MEM_READ,
619 SectionKind::getMetadata(), "section_info");
620 DwarfLineSection = Ctx->getCOFFSection(
622 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
623 COFF::IMAGE_SCN_MEM_READ,
624 SectionKind::getMetadata(), "section_line");
626 DwarfFrameSection = Ctx->getCOFFSection(
628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
629 COFF::IMAGE_SCN_MEM_READ,
630 SectionKind::getMetadata());
631 DwarfPubNamesSection = Ctx->getCOFFSection(
633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
634 COFF::IMAGE_SCN_MEM_READ,
635 SectionKind::getMetadata());
636 DwarfPubTypesSection = Ctx->getCOFFSection(
638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ,
640 SectionKind::getMetadata());
641 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
642 ".debug_gnu_pubnames",
643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
644 COFF::IMAGE_SCN_MEM_READ,
645 SectionKind::getMetadata());
646 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
647 ".debug_gnu_pubtypes",
648 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
649 COFF::IMAGE_SCN_MEM_READ,
650 SectionKind::getMetadata());
651 DwarfStrSection = Ctx->getCOFFSection(
653 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
654 COFF::IMAGE_SCN_MEM_READ,
655 SectionKind::getMetadata(), "info_string");
656 DwarfLocSection = Ctx->getCOFFSection(
658 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
659 COFF::IMAGE_SCN_MEM_READ,
660 SectionKind::getMetadata(), "section_debug_loc");
661 DwarfARangesSection = Ctx->getCOFFSection(
663 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
664 COFF::IMAGE_SCN_MEM_READ,
665 SectionKind::getMetadata());
666 DwarfRangesSection = Ctx->getCOFFSection(
668 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
669 COFF::IMAGE_SCN_MEM_READ,
670 SectionKind::getMetadata(), "debug_range");
671 DwarfInfoDWOSection = Ctx->getCOFFSection(
673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
674 COFF::IMAGE_SCN_MEM_READ,
675 SectionKind::getMetadata(), "section_info_dwo");
676 DwarfTypesDWOSection = Ctx->getCOFFSection(
678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
679 COFF::IMAGE_SCN_MEM_READ,
680 SectionKind::getMetadata(), "section_types_dwo");
681 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
684 COFF::IMAGE_SCN_MEM_READ,
685 SectionKind::getMetadata(), "section_abbrev_dwo");
686 DwarfStrDWOSection = Ctx->getCOFFSection(
688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
689 COFF::IMAGE_SCN_MEM_READ,
690 SectionKind::getMetadata(), "skel_string");
691 DwarfLineDWOSection = Ctx->getCOFFSection(
693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
694 COFF::IMAGE_SCN_MEM_READ,
695 SectionKind::getMetadata());
696 DwarfLocDWOSection = Ctx->getCOFFSection(
698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
699 COFF::IMAGE_SCN_MEM_READ,
700 SectionKind::getMetadata(), "skel_loc");
701 DwarfStrOffDWOSection = Ctx->getCOFFSection(
702 ".debug_str_offsets.dwo",
703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
704 COFF::IMAGE_SCN_MEM_READ,
705 SectionKind::getMetadata());
706 DwarfAddrSection = Ctx->getCOFFSection(
708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
709 COFF::IMAGE_SCN_MEM_READ,
710 SectionKind::getMetadata(), "addr_sec");
711 DwarfAccelNamesSection = Ctx->getCOFFSection(
713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
714 COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getMetadata(), "names_begin");
716 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
719 COFF::IMAGE_SCN_MEM_READ,
720 SectionKind::getMetadata(), "namespac_begin");
721 DwarfAccelTypesSection = Ctx->getCOFFSection(
723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
724 COFF::IMAGE_SCN_MEM_READ,
725 SectionKind::getMetadata(), "types_begin");
726 DwarfAccelObjCSection = Ctx->getCOFFSection(
728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
729 COFF::IMAGE_SCN_MEM_READ,
730 SectionKind::getMetadata(), "objc_begin");
732 DrectveSection = Ctx->getCOFFSection(
733 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
734 SectionKind::getMetadata());
736 PDataSection = Ctx->getCOFFSection(
737 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
738 SectionKind::getDataRel());
740 XDataSection = Ctx->getCOFFSection(
741 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
742 SectionKind::getDataRel());
744 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
745 SectionKind::getMetadata());
747 TLSDataSection = Ctx->getCOFFSection(
748 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
749 COFF::IMAGE_SCN_MEM_WRITE,
750 SectionKind::getDataRel());
752 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
753 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
754 COFF::IMAGE_SCN_MEM_READ,
755 SectionKind::getReadOnly());
758 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
767 CommDirectiveSupportsAlignment = true;
768 SupportsWeakOmittedEHFrame = true;
769 SupportsCompactUnwindWithoutEHFrame = false;
771 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
772 dwarf::DW_EH_PE_absptr;
774 CompactUnwindDwarfEHFrameOnly = 0;
776 EHFrameSection = nullptr; // Created on demand.
777 CompactUnwindSection = nullptr; // Used only by selected targets.
778 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
779 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
780 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
781 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
785 Triple::ArchType Arch = TT.getArch();
786 // FIXME: Checking for Arch here to filter out bogus triples such as
787 // cellspu-apple-darwin. Perhaps we should fix in Triple?
788 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
789 Arch == Triple::arm || Arch == Triple::thumb ||
790 Arch == Triple::aarch64 ||
791 Arch == Triple::ppc || Arch == Triple::ppc64 ||
792 Arch == Triple::UnknownArch) &&
793 TT.isOSBinFormatMachO()) {
795 initMachOMCObjectFileInfo(TT);
796 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
797 Arch == Triple::arm || Arch == Triple::thumb) &&
798 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
800 initCOFFMCObjectFileInfo(TT);
803 initELFMCObjectFileInfo(TT);
807 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
810 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
813 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
814 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
818 void MCObjectFileInfo::InitEHFrameSection() {
821 Ctx->getMachOSection("__TEXT", "__eh_frame",
823 MachO::S_ATTR_NO_TOC |
824 MachO::S_ATTR_STRIP_STATIC_SYMS |
825 MachO::S_ATTR_LIVE_SUPPORT,
826 SectionKind::getReadOnly());
827 else if (Env == IsELF)
829 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
832 Ctx->getCOFFSection(".eh_frame",
833 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
834 COFF::IMAGE_SCN_MEM_READ |
835 COFF::IMAGE_SCN_MEM_WRITE,
836 SectionKind::getDataRel());