1 //===-- MCObjectFileInfo.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, SectionKind::getData());
81 // BSSSection might not be expected initialized on msvc.
84 TLSDataSection // .tdata
85 = Ctx->getMachOSection("__DATA", "__thread_data",
86 MachO::S_THREAD_LOCAL_REGULAR,
87 SectionKind::getData());
88 TLSBSSSection // .tbss
89 = Ctx->getMachOSection("__DATA", "__thread_bss",
90 MachO::S_THREAD_LOCAL_ZEROFILL,
91 SectionKind::getThreadBSS());
93 // TODO: Verify datarel below.
95 = Ctx->getMachOSection("__DATA", "__thread_vars",
96 MachO::S_THREAD_LOCAL_VARIABLES,
97 SectionKind::getData());
99 TLSThreadInitSection = Ctx->getMachOSection(
100 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
101 SectionKind::getData());
103 CStringSection // .cstring
104 = Ctx->getMachOSection("__TEXT", "__cstring",
105 MachO::S_CSTRING_LITERALS,
106 SectionKind::getMergeable1ByteCString());
108 = Ctx->getMachOSection("__TEXT","__ustring", 0,
109 SectionKind::getMergeable2ByteCString());
110 FourByteConstantSection // .literal4
111 = Ctx->getMachOSection("__TEXT", "__literal4",
112 MachO::S_4BYTE_LITERALS,
113 SectionKind::getMergeableConst4());
114 EightByteConstantSection // .literal8
115 = Ctx->getMachOSection("__TEXT", "__literal8",
116 MachO::S_8BYTE_LITERALS,
117 SectionKind::getMergeableConst8());
119 SixteenByteConstantSection // .literal16
120 = Ctx->getMachOSection("__TEXT", "__literal16",
121 MachO::S_16BYTE_LITERALS,
122 SectionKind::getMergeableConst16());
124 ReadOnlySection // .const
125 = Ctx->getMachOSection("__TEXT", "__const", 0,
126 SectionKind::getReadOnly());
128 // If the target is not powerpc, map the coal sections to the non-coal
131 // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
132 // "__TEXT/__const_coal" => section "__TEXT/__const"
133 // "__DATA/__datacoal_nt" => section "__DATA/__data"
134 Triple::ArchType ArchTy = T.getArch();
136 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
138 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
140 MachO::S_ATTR_PURE_INSTRUCTIONS,
141 SectionKind::getText());
143 = Ctx->getMachOSection("__TEXT", "__const_coal",
145 SectionKind::getReadOnly());
146 DataCoalSection = Ctx->getMachOSection(
147 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
149 TextCoalSection = TextSection;
150 ConstTextCoalSection = ReadOnlySection;
151 DataCoalSection = DataSection;
154 ConstDataSection // .const_data
155 = Ctx->getMachOSection("__DATA", "__const", 0,
156 SectionKind::getReadOnlyWithRel());
158 = Ctx->getMachOSection("__DATA","__common",
160 SectionKind::getBSS());
162 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
163 SectionKind::getBSS());
166 LazySymbolPointerSection
167 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
168 MachO::S_LAZY_SYMBOL_POINTERS,
169 SectionKind::getMetadata());
170 NonLazySymbolPointerSection
171 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
172 MachO::S_NON_LAZY_SYMBOL_POINTERS,
173 SectionKind::getMetadata());
175 if (RelocM == Reloc::Static) {
176 StaticCtorSection = Ctx->getMachOSection("__TEXT", "__constructor", 0,
177 SectionKind::getData());
178 StaticDtorSection = Ctx->getMachOSection("__TEXT", "__destructor", 0,
179 SectionKind::getData());
181 StaticCtorSection = Ctx->getMachOSection("__DATA", "__mod_init_func",
182 MachO::S_MOD_INIT_FUNC_POINTERS,
183 SectionKind::getData());
184 StaticDtorSection = Ctx->getMachOSection("__DATA", "__mod_term_func",
185 MachO::S_MOD_TERM_FUNC_POINTERS,
186 SectionKind::getData());
189 // Exception Handling.
190 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
191 SectionKind::getReadOnlyWithRel());
193 COFFDebugSymbolsSection = nullptr;
195 if (useCompactUnwind(T)) {
196 CompactUnwindSection =
197 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
198 SectionKind::getReadOnly());
200 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
201 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF
202 else if (T.getArch() == Triple::aarch64)
203 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF
204 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
205 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF
208 // Debug Information.
209 DwarfAccelNamesSection =
210 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
211 SectionKind::getMetadata(), "names_begin");
212 DwarfAccelObjCSection =
213 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
214 SectionKind::getMetadata(), "objc_begin");
215 // 16 character section limit...
216 DwarfAccelNamespaceSection =
217 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
218 SectionKind::getMetadata(), "namespac_begin");
219 DwarfAccelTypesSection =
220 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
221 SectionKind::getMetadata(), "types_begin");
224 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
225 SectionKind::getMetadata(), "section_abbrev");
227 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
228 SectionKind::getMetadata(), "section_info");
230 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
231 SectionKind::getMetadata(), "section_line");
233 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
234 SectionKind::getMetadata());
235 DwarfPubNamesSection =
236 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
237 SectionKind::getMetadata());
238 DwarfPubTypesSection =
239 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
240 SectionKind::getMetadata());
241 DwarfGnuPubNamesSection =
242 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
243 SectionKind::getMetadata());
244 DwarfGnuPubTypesSection =
245 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
246 SectionKind::getMetadata());
248 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
249 SectionKind::getMetadata(), "info_string");
251 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
252 SectionKind::getMetadata(), "section_debug_loc");
253 DwarfARangesSection =
254 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
255 SectionKind::getMetadata());
257 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
258 SectionKind::getMetadata(), "debug_range");
259 DwarfMacinfoSection =
260 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
261 SectionKind::getMetadata());
262 DwarfDebugInlineSection =
263 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
264 SectionKind::getMetadata());
265 DwarfCUIndexSection =
266 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
267 SectionKind::getMetadata());
268 DwarfTUIndexSection =
269 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
270 SectionKind::getMetadata());
271 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
272 0, SectionKind::getMetadata());
274 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
275 0, SectionKind::getMetadata());
277 TLSExtraDataSection = TLSTLVSection;
280 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
281 switch (T.getArch()) {
284 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
287 case Triple::mips64el:
288 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
291 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
292 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
293 : dwarf::DW_EH_PE_sdata4);
296 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
300 switch (T.getArch()) {
304 case Triple::thumbeb:
305 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
307 // Fallthrough if not using EHABI
310 PersonalityEncoding = (RelocM == Reloc::PIC_)
311 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
312 : dwarf::DW_EH_PE_absptr;
313 LSDAEncoding = (RelocM == Reloc::PIC_)
314 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
315 : dwarf::DW_EH_PE_absptr;
316 TTypeEncoding = (RelocM == Reloc::PIC_)
317 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
318 : dwarf::DW_EH_PE_absptr;
321 if (RelocM == Reloc::PIC_) {
322 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
323 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
324 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
325 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
326 (CMModel == CodeModel::Small
327 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
328 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
329 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
330 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
332 PersonalityEncoding =
333 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
334 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
335 LSDAEncoding = (CMModel == CodeModel::Small)
336 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
337 TTypeEncoding = (CMModel == CodeModel::Small)
338 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
341 case Triple::aarch64:
342 case Triple::aarch64_be:
343 // The small model guarantees static code/data size < 4GB, but not where it
344 // will be in memory. Most of these could end up >2GB away so even a signed
345 // pc-relative 32-bit address is insufficient, theoretically.
346 if (RelocM == Reloc::PIC_) {
347 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
348 dwarf::DW_EH_PE_sdata8;
349 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
350 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
351 dwarf::DW_EH_PE_sdata8;
353 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
354 LSDAEncoding = dwarf::DW_EH_PE_absptr;
355 TTypeEncoding = dwarf::DW_EH_PE_absptr;
361 case Triple::mips64el:
362 // MIPS uses indirect pointer to refer personality functions and types, so
363 // that the eh_frame section can be read-only. DW.ref.personality will be
364 // generated for relocation.
365 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
366 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
367 // identify N64 from just a triple.
368 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
369 dwarf::DW_EH_PE_sdata4;
370 // We don't support PC-relative LSDA references in GAS so we use the default
371 // DW_EH_PE_absptr for those.
374 case Triple::ppc64le:
375 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
376 dwarf::DW_EH_PE_udata8;
377 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
378 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
379 dwarf::DW_EH_PE_udata8;
381 case Triple::sparcel:
383 if (RelocM == Reloc::PIC_) {
384 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
385 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
386 dwarf::DW_EH_PE_sdata4;
387 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
388 dwarf::DW_EH_PE_sdata4;
390 LSDAEncoding = dwarf::DW_EH_PE_absptr;
391 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
392 TTypeEncoding = dwarf::DW_EH_PE_absptr;
395 case Triple::sparcv9:
396 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
397 if (RelocM == Reloc::PIC_) {
398 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
399 dwarf::DW_EH_PE_sdata4;
400 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
401 dwarf::DW_EH_PE_sdata4;
403 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
404 TTypeEncoding = dwarf::DW_EH_PE_absptr;
407 case Triple::systemz:
408 // All currently-defined code models guarantee that 4-byte PC-relative
409 // values will be in range.
410 if (RelocM == Reloc::PIC_) {
411 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
412 dwarf::DW_EH_PE_sdata4;
413 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
414 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
415 dwarf::DW_EH_PE_sdata4;
417 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
418 LSDAEncoding = dwarf::DW_EH_PE_absptr;
419 TTypeEncoding = dwarf::DW_EH_PE_absptr;
426 unsigned EHSectionType = T.getArch() == Triple::x86_64
427 ? ELF::SHT_X86_64_UNWIND
430 // Solaris requires different flags for .eh_frame to seemingly every other
432 unsigned EHSectionFlags = ELF::SHF_ALLOC;
433 if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
434 EHSectionFlags |= ELF::SHF_WRITE;
437 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
438 ELF::SHF_WRITE | ELF::SHF_ALLOC);
440 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
441 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
443 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
444 ELF::SHF_WRITE | ELF::SHF_ALLOC);
447 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
450 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
451 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
453 TLSBSSSection = Ctx->getELFSection(
454 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
456 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
457 ELF::SHF_ALLOC | ELF::SHF_WRITE);
459 MergeableConst4Section =
460 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
461 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
463 MergeableConst8Section =
464 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
465 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
467 MergeableConst16Section =
468 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
469 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
471 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
472 ELF::SHF_ALLOC | ELF::SHF_WRITE);
474 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
475 ELF::SHF_ALLOC | ELF::SHF_WRITE);
477 // Exception Handling Sections.
479 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
480 // it contains relocatable pointers. In PIC mode, this is probably a big
481 // runtime hit for C++ apps. Either the contents of the LSDA need to be
482 // adjusted or this should be a data section.
483 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
486 COFFDebugSymbolsSection = nullptr;
488 // Debug Info Sections.
489 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
492 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
493 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
494 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
495 DwarfPubNamesSection =
496 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
497 DwarfPubTypesSection =
498 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
499 DwarfGnuPubNamesSection =
500 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
501 DwarfGnuPubTypesSection =
502 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
504 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
505 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
506 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
507 DwarfARangesSection =
508 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
510 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
511 DwarfMacinfoSection =
512 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0);
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 DwarfCUIndexSection =
547 Ctx->getELFSection(".debug_cu_index", ELF::SHT_PROGBITS, 0);
548 DwarfTUIndexSection =
549 Ctx->getELFSection(".debug_tu_index", ELF::SHT_PROGBITS, 0);
552 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
555 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
558 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
561 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
562 EHFrameSection = Ctx->getCOFFSection(
563 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
564 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
565 SectionKind::getData());
567 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
569 CommDirectiveSupportsAlignment = true;
572 BSSSection = Ctx->getCOFFSection(
573 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
574 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
575 SectionKind::getBSS());
576 TextSection = Ctx->getCOFFSection(
578 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
579 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
580 COFF::IMAGE_SCN_MEM_READ,
581 SectionKind::getText());
582 DataSection = Ctx->getCOFFSection(
583 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
584 COFF::IMAGE_SCN_MEM_WRITE,
585 SectionKind::getData());
586 ReadOnlySection = Ctx->getCOFFSection(
587 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
588 SectionKind::getReadOnly());
590 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
592 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
593 COFF::IMAGE_SCN_MEM_READ,
594 SectionKind::getReadOnly());
596 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
597 COFF::IMAGE_SCN_MEM_READ,
598 SectionKind::getReadOnly());
600 StaticCtorSection = Ctx->getCOFFSection(
601 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
602 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
603 SectionKind::getData());
604 StaticDtorSection = Ctx->getCOFFSection(
605 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
606 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
607 SectionKind::getData());
610 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
611 // though it contains relocatable pointers. In PIC mode, this is probably a
612 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
613 // adjusted or this should be a data section.
614 if (T.getArch() == Triple::x86_64) {
615 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
616 LSDASection = nullptr;
618 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
619 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
620 COFF::IMAGE_SCN_MEM_READ,
621 SectionKind::getReadOnly());
625 COFFDebugSymbolsSection =
626 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
627 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
628 COFF::IMAGE_SCN_MEM_READ,
629 SectionKind::getMetadata());
631 DwarfAbbrevSection = Ctx->getCOFFSection(
633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
634 COFF::IMAGE_SCN_MEM_READ,
635 SectionKind::getMetadata(), "section_abbrev");
636 DwarfInfoSection = Ctx->getCOFFSection(
638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ,
640 SectionKind::getMetadata(), "section_info");
641 DwarfLineSection = Ctx->getCOFFSection(
643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
644 COFF::IMAGE_SCN_MEM_READ,
645 SectionKind::getMetadata(), "section_line");
647 DwarfFrameSection = Ctx->getCOFFSection(
649 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
650 COFF::IMAGE_SCN_MEM_READ,
651 SectionKind::getMetadata());
652 DwarfPubNamesSection = Ctx->getCOFFSection(
654 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
655 COFF::IMAGE_SCN_MEM_READ,
656 SectionKind::getMetadata());
657 DwarfPubTypesSection = Ctx->getCOFFSection(
659 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
660 COFF::IMAGE_SCN_MEM_READ,
661 SectionKind::getMetadata());
662 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
663 ".debug_gnu_pubnames",
664 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
665 COFF::IMAGE_SCN_MEM_READ,
666 SectionKind::getMetadata());
667 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
668 ".debug_gnu_pubtypes",
669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
670 COFF::IMAGE_SCN_MEM_READ,
671 SectionKind::getMetadata());
672 DwarfStrSection = Ctx->getCOFFSection(
674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
675 COFF::IMAGE_SCN_MEM_READ,
676 SectionKind::getMetadata(), "info_string");
677 DwarfLocSection = Ctx->getCOFFSection(
679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
680 COFF::IMAGE_SCN_MEM_READ,
681 SectionKind::getMetadata(), "section_debug_loc");
682 DwarfARangesSection = Ctx->getCOFFSection(
684 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
685 COFF::IMAGE_SCN_MEM_READ,
686 SectionKind::getMetadata());
687 DwarfRangesSection = Ctx->getCOFFSection(
689 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
690 COFF::IMAGE_SCN_MEM_READ,
691 SectionKind::getMetadata(), "debug_range");
692 DwarfMacinfoSection = Ctx->getCOFFSection(
694 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
695 COFF::IMAGE_SCN_MEM_READ,
696 SectionKind::getMetadata());
697 DwarfInfoDWOSection = Ctx->getCOFFSection(
699 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
700 COFF::IMAGE_SCN_MEM_READ,
701 SectionKind::getMetadata(), "section_info_dwo");
702 DwarfTypesDWOSection = Ctx->getCOFFSection(
704 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
705 COFF::IMAGE_SCN_MEM_READ,
706 SectionKind::getMetadata(), "section_types_dwo");
707 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
709 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
710 COFF::IMAGE_SCN_MEM_READ,
711 SectionKind::getMetadata(), "section_abbrev_dwo");
712 DwarfStrDWOSection = Ctx->getCOFFSection(
714 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
715 COFF::IMAGE_SCN_MEM_READ,
716 SectionKind::getMetadata(), "skel_string");
717 DwarfLineDWOSection = Ctx->getCOFFSection(
719 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
720 COFF::IMAGE_SCN_MEM_READ,
721 SectionKind::getMetadata());
722 DwarfLocDWOSection = Ctx->getCOFFSection(
724 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
725 COFF::IMAGE_SCN_MEM_READ,
726 SectionKind::getMetadata(), "skel_loc");
727 DwarfStrOffDWOSection = Ctx->getCOFFSection(
728 ".debug_str_offsets.dwo",
729 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
730 COFF::IMAGE_SCN_MEM_READ,
731 SectionKind::getMetadata());
732 DwarfAddrSection = Ctx->getCOFFSection(
734 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
735 COFF::IMAGE_SCN_MEM_READ,
736 SectionKind::getMetadata(), "addr_sec");
737 DwarfCUIndexSection = Ctx->getCOFFSection(
739 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
740 COFF::IMAGE_SCN_MEM_READ,
741 SectionKind::getMetadata());
742 DwarfTUIndexSection = Ctx->getCOFFSection(
744 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
745 COFF::IMAGE_SCN_MEM_READ,
746 SectionKind::getMetadata());
747 DwarfAccelNamesSection = Ctx->getCOFFSection(
749 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
750 COFF::IMAGE_SCN_MEM_READ,
751 SectionKind::getMetadata(), "names_begin");
752 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
754 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
755 COFF::IMAGE_SCN_MEM_READ,
756 SectionKind::getMetadata(), "namespac_begin");
757 DwarfAccelTypesSection = Ctx->getCOFFSection(
759 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
760 COFF::IMAGE_SCN_MEM_READ,
761 SectionKind::getMetadata(), "types_begin");
762 DwarfAccelObjCSection = Ctx->getCOFFSection(
764 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
765 COFF::IMAGE_SCN_MEM_READ,
766 SectionKind::getMetadata(), "objc_begin");
768 DrectveSection = Ctx->getCOFFSection(
769 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
770 SectionKind::getMetadata());
772 PDataSection = Ctx->getCOFFSection(
773 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
774 SectionKind::getData());
776 XDataSection = Ctx->getCOFFSection(
777 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
778 SectionKind::getData());
780 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
781 SectionKind::getMetadata());
783 TLSDataSection = Ctx->getCOFFSection(
784 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
785 COFF::IMAGE_SCN_MEM_WRITE,
786 SectionKind::getData());
788 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
789 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
790 COFF::IMAGE_SCN_MEM_READ,
791 SectionKind::getReadOnly());
794 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
803 CommDirectiveSupportsAlignment = true;
804 SupportsWeakOmittedEHFrame = true;
805 SupportsCompactUnwindWithoutEHFrame = false;
806 OmitDwarfIfHaveCompactUnwind = false;
808 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
809 dwarf::DW_EH_PE_absptr;
811 CompactUnwindDwarfEHFrameOnly = 0;
813 EHFrameSection = nullptr; // Created on demand.
814 CompactUnwindSection = nullptr; // Used only by selected targets.
815 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
816 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
817 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
818 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
822 switch (TT.getObjectFormat()) {
825 initMachOMCObjectFileInfo(TT);
828 if (!TT.isOSWindows())
830 "Cannot initialize MC for non-Windows COFF object files.");
833 initCOFFMCObjectFileInfo(TT);
837 initELFMCObjectFileInfo(TT);
839 case Triple::UnknownObjectFormat:
840 report_fatal_error("Cannot initialize MC for unknown object file format.");
845 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
848 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
851 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
852 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,