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", MachO::S_ATTR_DEBUG,
187 SectionKind::getMetadata(), "names_begin");
188 DwarfAccelObjCSection =
189 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
190 SectionKind::getMetadata(), "objc_begin");
191 // 16 character section limit...
192 DwarfAccelNamespaceSection =
193 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
194 SectionKind::getMetadata(), "namespac_begin");
195 DwarfAccelTypesSection =
196 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
197 SectionKind::getMetadata(), "types_begin");
200 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
201 SectionKind::getMetadata(), "section_abbrev");
203 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
204 SectionKind::getMetadata(), "section_info");
206 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
207 SectionKind::getMetadata(), "section_line");
209 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
210 SectionKind::getMetadata());
211 DwarfPubNamesSection =
212 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
213 SectionKind::getMetadata());
214 DwarfPubTypesSection =
215 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
216 SectionKind::getMetadata());
217 DwarfGnuPubNamesSection =
218 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
219 SectionKind::getMetadata());
220 DwarfGnuPubTypesSection =
221 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
222 SectionKind::getMetadata());
224 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
225 SectionKind::getMetadata(), "info_string");
227 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
228 SectionKind::getMetadata(), "section_debug_loc");
229 DwarfARangesSection =
230 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
231 SectionKind::getMetadata());
233 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
234 SectionKind::getMetadata(), "debug_range");
235 DwarfDebugInlineSection =
236 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
237 SectionKind::getMetadata());
238 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
239 0, SectionKind::getMetadata());
241 TLSExtraDataSection = TLSTLVSection;
244 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
245 switch (T.getArch()) {
248 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
251 case Triple::mips64el:
252 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
255 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
256 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
257 : dwarf::DW_EH_PE_sdata4);
261 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
265 switch (T.getArch()) {
269 case Triple::thumbeb:
270 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
272 // Fallthrough if not using EHABI
275 PersonalityEncoding = (RelocM == Reloc::PIC_)
276 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
277 : dwarf::DW_EH_PE_absptr;
278 LSDAEncoding = (RelocM == Reloc::PIC_)
279 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
280 : dwarf::DW_EH_PE_absptr;
281 TTypeEncoding = (RelocM == Reloc::PIC_)
282 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
283 : dwarf::DW_EH_PE_absptr;
286 if (RelocM == Reloc::PIC_) {
287 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
288 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
289 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
290 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
291 (CMModel == CodeModel::Small
292 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
293 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
294 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
295 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
297 PersonalityEncoding =
298 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
299 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
300 LSDAEncoding = (CMModel == CodeModel::Small)
301 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
302 TTypeEncoding = (CMModel == CodeModel::Small)
303 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
306 case Triple::aarch64:
307 case Triple::aarch64_be:
308 // The small model guarantees static code/data size < 4GB, but not where it
309 // will be in memory. Most of these could end up >2GB away so even a signed
310 // pc-relative 32-bit address is insufficient, theoretically.
311 if (RelocM == Reloc::PIC_) {
312 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
313 dwarf::DW_EH_PE_sdata8;
314 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
315 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
316 dwarf::DW_EH_PE_sdata8;
318 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
319 LSDAEncoding = dwarf::DW_EH_PE_absptr;
320 TTypeEncoding = dwarf::DW_EH_PE_absptr;
326 case Triple::mips64el:
327 // MIPS uses indirect pointer to refer personality functions and types, so
328 // that the eh_frame section can be read-only. DW.ref.personality will be
329 // generated for relocation.
330 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
331 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
332 // identify N64 from just a triple.
333 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
334 dwarf::DW_EH_PE_sdata4;
335 // We don't support PC-relative LSDA references in GAS so we use the default
336 // DW_EH_PE_absptr for those.
339 case Triple::ppc64le:
340 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
341 dwarf::DW_EH_PE_udata8;
342 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
343 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
344 dwarf::DW_EH_PE_udata8;
346 case Triple::sparcel:
348 if (RelocM == Reloc::PIC_) {
349 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
350 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
351 dwarf::DW_EH_PE_sdata4;
352 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
353 dwarf::DW_EH_PE_sdata4;
355 LSDAEncoding = dwarf::DW_EH_PE_absptr;
356 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
357 TTypeEncoding = dwarf::DW_EH_PE_absptr;
360 case Triple::sparcv9:
361 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
362 if (RelocM == Reloc::PIC_) {
363 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
364 dwarf::DW_EH_PE_sdata4;
365 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
366 dwarf::DW_EH_PE_sdata4;
368 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
369 TTypeEncoding = dwarf::DW_EH_PE_absptr;
372 case Triple::systemz:
373 // All currently-defined code models guarantee that 4-byte PC-relative
374 // values will be in range.
375 if (RelocM == Reloc::PIC_) {
376 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
377 dwarf::DW_EH_PE_sdata4;
378 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
379 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
380 dwarf::DW_EH_PE_sdata4;
382 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
383 LSDAEncoding = dwarf::DW_EH_PE_absptr;
384 TTypeEncoding = dwarf::DW_EH_PE_absptr;
391 // Solaris requires different flags for .eh_frame to seemingly every other
393 EHSectionType = ELF::SHT_PROGBITS;
394 EHSectionFlags = ELF::SHF_ALLOC;
395 if (T.isOSSolaris()) {
396 if (T.getArch() == Triple::x86_64)
397 EHSectionType = ELF::SHT_X86_64_UNWIND;
399 EHSectionFlags |= ELF::SHF_WRITE;
404 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
405 ELF::SHF_WRITE | ELF::SHF_ALLOC);
407 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
408 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
410 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
411 ELF::SHF_WRITE | ELF::SHF_ALLOC);
414 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
417 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
418 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
420 TLSBSSSection = Ctx->getELFSection(
421 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
423 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
424 ELF::SHF_ALLOC | ELF::SHF_WRITE);
426 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
427 ELF::SHF_ALLOC | ELF::SHF_WRITE);
429 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
430 ELF::SHF_ALLOC | ELF::SHF_WRITE);
432 DataRelROLocalSection = Ctx->getELFSection(
433 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
435 MergeableConst4Section =
436 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
437 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
439 MergeableConst8Section =
440 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
441 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
443 MergeableConst16Section =
444 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
447 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
448 ELF::SHF_ALLOC | ELF::SHF_WRITE);
450 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
451 ELF::SHF_ALLOC | ELF::SHF_WRITE);
453 // Exception Handling Sections.
455 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
456 // it contains relocatable pointers. In PIC mode, this is probably a big
457 // runtime hit for C++ apps. Either the contents of the LSDA need to be
458 // adjusted or this should be a data section.
459 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
462 COFFDebugSymbolsSection = nullptr;
464 // Debug Info Sections.
465 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
468 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
469 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
470 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
471 DwarfPubNamesSection =
472 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
473 DwarfPubTypesSection =
474 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
475 DwarfGnuPubNamesSection =
476 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
477 DwarfGnuPubTypesSection =
478 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
480 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
481 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
482 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
483 DwarfARangesSection =
484 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
486 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
488 // DWARF5 Experimental Debug Info
490 // Accelerator Tables
491 DwarfAccelNamesSection =
492 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
493 DwarfAccelObjCSection =
494 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
495 DwarfAccelNamespaceSection = Ctx->getELFSection(
496 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
497 DwarfAccelTypesSection =
498 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
501 DwarfInfoDWOSection =
502 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
503 DwarfTypesDWOSection =
504 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
505 DwarfAbbrevDWOSection =
506 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
508 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
509 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
510 DwarfLineDWOSection =
511 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
513 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
514 DwarfStrOffDWOSection =
515 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
517 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
520 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
523 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
524 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
526 CommDirectiveSupportsAlignment = true;
529 BSSSection = Ctx->getCOFFSection(
530 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
531 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
532 SectionKind::getBSS());
533 TextSection = Ctx->getCOFFSection(
535 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
536 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
537 COFF::IMAGE_SCN_MEM_READ,
538 SectionKind::getText());
539 DataSection = Ctx->getCOFFSection(
540 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
541 COFF::IMAGE_SCN_MEM_WRITE,
542 SectionKind::getDataRel());
543 ReadOnlySection = Ctx->getCOFFSection(
544 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
545 SectionKind::getReadOnly());
547 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
549 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
550 COFF::IMAGE_SCN_MEM_READ,
551 SectionKind::getReadOnly());
553 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
554 COFF::IMAGE_SCN_MEM_READ,
555 SectionKind::getReadOnly());
557 StaticCtorSection = Ctx->getCOFFSection(
558 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
559 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
560 SectionKind::getDataRel());
561 StaticDtorSection = Ctx->getCOFFSection(
562 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
563 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
564 SectionKind::getDataRel());
567 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
568 // though it contains relocatable pointers. In PIC mode, this is probably a
569 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
570 // adjusted or this should be a data section.
571 assert(T.isOSWindows() && "Windows is the only supported COFF target");
572 if (T.getArch() == Triple::x86_64) {
573 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
576 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
577 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
578 COFF::IMAGE_SCN_MEM_READ,
579 SectionKind::getReadOnly());
583 COFFDebugSymbolsSection =
584 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
585 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
586 COFF::IMAGE_SCN_MEM_READ,
587 SectionKind::getMetadata());
589 DwarfAbbrevSection = Ctx->getCOFFSection(
591 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
592 COFF::IMAGE_SCN_MEM_READ,
593 SectionKind::getMetadata(), "section_abbrev");
594 DwarfInfoSection = Ctx->getCOFFSection(
596 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
597 COFF::IMAGE_SCN_MEM_READ,
598 SectionKind::getMetadata(), "section_info");
599 DwarfLineSection = Ctx->getCOFFSection(
601 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
602 COFF::IMAGE_SCN_MEM_READ,
603 SectionKind::getMetadata(), "section_line");
605 DwarfFrameSection = Ctx->getCOFFSection(
607 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
608 COFF::IMAGE_SCN_MEM_READ,
609 SectionKind::getMetadata());
610 DwarfPubNamesSection = Ctx->getCOFFSection(
612 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
613 COFF::IMAGE_SCN_MEM_READ,
614 SectionKind::getMetadata());
615 DwarfPubTypesSection = Ctx->getCOFFSection(
617 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
618 COFF::IMAGE_SCN_MEM_READ,
619 SectionKind::getMetadata());
620 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
621 ".debug_gnu_pubnames",
622 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
623 COFF::IMAGE_SCN_MEM_READ,
624 SectionKind::getMetadata());
625 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
626 ".debug_gnu_pubtypes",
627 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
628 COFF::IMAGE_SCN_MEM_READ,
629 SectionKind::getMetadata());
630 DwarfStrSection = Ctx->getCOFFSection(
632 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
633 COFF::IMAGE_SCN_MEM_READ,
634 SectionKind::getMetadata(), "info_string");
635 DwarfLocSection = Ctx->getCOFFSection(
637 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
638 COFF::IMAGE_SCN_MEM_READ,
639 SectionKind::getMetadata(), "section_debug_loc");
640 DwarfARangesSection = Ctx->getCOFFSection(
642 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
643 COFF::IMAGE_SCN_MEM_READ,
644 SectionKind::getMetadata());
645 DwarfRangesSection = Ctx->getCOFFSection(
647 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
648 COFF::IMAGE_SCN_MEM_READ,
649 SectionKind::getMetadata(), "debug_range");
650 DwarfInfoDWOSection = Ctx->getCOFFSection(
652 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
653 COFF::IMAGE_SCN_MEM_READ,
654 SectionKind::getMetadata(), "section_info_dwo");
655 DwarfTypesDWOSection = Ctx->getCOFFSection(
657 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
658 COFF::IMAGE_SCN_MEM_READ,
659 SectionKind::getMetadata(), "section_types_dwo");
660 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
662 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
663 COFF::IMAGE_SCN_MEM_READ,
664 SectionKind::getMetadata(), "section_abbrev_dwo");
665 DwarfStrDWOSection = Ctx->getCOFFSection(
667 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
668 COFF::IMAGE_SCN_MEM_READ,
669 SectionKind::getMetadata(), "skel_string");
670 DwarfLineDWOSection = Ctx->getCOFFSection(
672 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
673 COFF::IMAGE_SCN_MEM_READ,
674 SectionKind::getMetadata());
675 DwarfLocDWOSection = Ctx->getCOFFSection(
677 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
678 COFF::IMAGE_SCN_MEM_READ,
679 SectionKind::getMetadata(), "skel_loc");
680 DwarfStrOffDWOSection = Ctx->getCOFFSection(
681 ".debug_str_offsets.dwo",
682 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
683 COFF::IMAGE_SCN_MEM_READ,
684 SectionKind::getMetadata());
685 DwarfAddrSection = Ctx->getCOFFSection(
687 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
688 COFF::IMAGE_SCN_MEM_READ,
689 SectionKind::getMetadata(), "addr_sec");
690 DwarfAccelNamesSection = Ctx->getCOFFSection(
692 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
693 COFF::IMAGE_SCN_MEM_READ,
694 SectionKind::getMetadata(), "names_begin");
695 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
697 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
698 COFF::IMAGE_SCN_MEM_READ,
699 SectionKind::getMetadata(), "namespac_begin");
700 DwarfAccelTypesSection = Ctx->getCOFFSection(
702 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
703 COFF::IMAGE_SCN_MEM_READ,
704 SectionKind::getMetadata(), "types_begin");
705 DwarfAccelObjCSection = Ctx->getCOFFSection(
707 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
708 COFF::IMAGE_SCN_MEM_READ,
709 SectionKind::getMetadata(), "objc_begin");
711 DrectveSection = Ctx->getCOFFSection(
712 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
713 SectionKind::getMetadata());
715 PDataSection = Ctx->getCOFFSection(
716 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
717 SectionKind::getDataRel());
719 XDataSection = Ctx->getCOFFSection(
720 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
721 SectionKind::getDataRel());
723 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
724 SectionKind::getMetadata());
726 TLSDataSection = Ctx->getCOFFSection(
727 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
728 COFF::IMAGE_SCN_MEM_WRITE,
729 SectionKind::getDataRel());
732 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
740 CommDirectiveSupportsAlignment = true;
741 SupportsWeakOmittedEHFrame = true;
742 SupportsCompactUnwindWithoutEHFrame = false;
744 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
745 dwarf::DW_EH_PE_absptr;
747 CompactUnwindDwarfEHFrameOnly = 0;
749 EHFrameSection = nullptr; // Created on demand.
750 CompactUnwindSection = nullptr; // Used only by selected targets.
751 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
752 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
753 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
754 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
758 Triple::ArchType Arch = TT.getArch();
759 // FIXME: Checking for Arch here to filter out bogus triples such as
760 // cellspu-apple-darwin. Perhaps we should fix in Triple?
761 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
762 Arch == Triple::arm || Arch == Triple::thumb ||
763 Arch == Triple::aarch64 ||
764 Arch == Triple::ppc || Arch == Triple::ppc64 ||
765 Arch == Triple::UnknownArch) &&
766 TT.isOSBinFormatMachO()) {
768 initMachOMCObjectFileInfo(TT);
769 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
770 Arch == Triple::arm || Arch == Triple::thumb) &&
771 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
773 initCOFFMCObjectFileInfo(TT);
776 initELFMCObjectFileInfo(TT);
780 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
781 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
785 void MCObjectFileInfo::InitEHFrameSection() {
788 Ctx->getMachOSection("__TEXT", "__eh_frame",
790 MachO::S_ATTR_NO_TOC |
791 MachO::S_ATTR_STRIP_STATIC_SYMS |
792 MachO::S_ATTR_LIVE_SUPPORT,
793 SectionKind::getReadOnly());
794 else if (Env == IsELF)
796 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
799 Ctx->getCOFFSection(".eh_frame",
800 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
801 COFF::IMAGE_SCN_MEM_READ |
802 COFF::IMAGE_SCN_MEM_WRITE,
803 SectionKind::getDataRel());