1 //===-- MObjectFileInfo.cpp - Object File Information ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCObjectFileInfo.h"
11 #include "llvm/ADT/StringExtras.h"
12 #include "llvm/ADT/Triple.h"
13 #include "llvm/MC/MCAsmInfo.h"
14 #include "llvm/MC/MCContext.h"
15 #include "llvm/MC/MCSection.h"
16 #include "llvm/MC/MCSectionCOFF.h"
17 #include "llvm/MC/MCSectionELF.h"
18 #include "llvm/MC/MCSectionMachO.h"
19 #include "llvm/Support/COFF.h"
23 static bool useCompactUnwind(const Triple &T) {
28 // aarch64 always has it.
29 if (T.getArch() == Triple::aarch64)
32 // armv7k always has it.
36 // Use it on newer version of OS X.
37 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
40 // And the iOS simulator.
42 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
48 void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
50 SupportsWeakOmittedEHFrame = false;
52 EHFrameSection = Ctx->getMachOSection(
53 "__TEXT", "__eh_frame",
54 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
55 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
56 SectionKind::getReadOnly());
58 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
59 SupportsCompactUnwindWithoutEHFrame = true;
62 OmitDwarfIfHaveCompactUnwind = true;
64 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
65 | dwarf::DW_EH_PE_sdata4;
66 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
67 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
68 dwarf::DW_EH_PE_sdata4;
70 // .comm doesn't support alignment before Leopard.
71 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
72 CommDirectiveSupportsAlignment = false;
75 = Ctx->getMachOSection("__TEXT", "__text",
76 MachO::S_ATTR_PURE_INSTRUCTIONS,
77 SectionKind::getText());
79 = Ctx->getMachOSection("__DATA", "__data", 0, 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 DwarfDebugInlineSection =
260 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
261 SectionKind::getMetadata());
262 DwarfCUIndexSection =
263 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
264 SectionKind::getMetadata());
265 DwarfTUIndexSection =
266 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
267 SectionKind::getMetadata());
268 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
269 0, SectionKind::getMetadata());
271 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
272 0, SectionKind::getMetadata());
274 TLSExtraDataSection = TLSTLVSection;
277 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
278 switch (T.getArch()) {
281 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
284 case Triple::mips64el:
285 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
288 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
289 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
290 : dwarf::DW_EH_PE_sdata4);
293 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
297 switch (T.getArch()) {
301 case Triple::thumbeb:
302 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
304 // Fallthrough if not using EHABI
307 PersonalityEncoding = (RelocM == Reloc::PIC_)
308 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
309 : dwarf::DW_EH_PE_absptr;
310 LSDAEncoding = (RelocM == Reloc::PIC_)
311 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
312 : dwarf::DW_EH_PE_absptr;
313 TTypeEncoding = (RelocM == Reloc::PIC_)
314 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
315 : dwarf::DW_EH_PE_absptr;
318 if (RelocM == Reloc::PIC_) {
319 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
320 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
321 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
322 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
323 (CMModel == CodeModel::Small
324 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
325 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
326 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
327 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
329 PersonalityEncoding =
330 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
331 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
332 LSDAEncoding = (CMModel == CodeModel::Small)
333 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
334 TTypeEncoding = (CMModel == CodeModel::Small)
335 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
338 case Triple::aarch64:
339 case Triple::aarch64_be:
340 // The small model guarantees static code/data size < 4GB, but not where it
341 // will be in memory. Most of these could end up >2GB away so even a signed
342 // pc-relative 32-bit address is insufficient, theoretically.
343 if (RelocM == Reloc::PIC_) {
344 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
345 dwarf::DW_EH_PE_sdata8;
346 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
347 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
348 dwarf::DW_EH_PE_sdata8;
350 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
351 LSDAEncoding = dwarf::DW_EH_PE_absptr;
352 TTypeEncoding = dwarf::DW_EH_PE_absptr;
358 case Triple::mips64el:
359 // MIPS uses indirect pointer to refer personality functions and types, so
360 // that the eh_frame section can be read-only. DW.ref.personality will be
361 // generated for relocation.
362 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
363 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
364 // identify N64 from just a triple.
365 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
366 dwarf::DW_EH_PE_sdata4;
367 // We don't support PC-relative LSDA references in GAS so we use the default
368 // DW_EH_PE_absptr for those.
371 case Triple::ppc64le:
372 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
373 dwarf::DW_EH_PE_udata8;
374 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
375 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
376 dwarf::DW_EH_PE_udata8;
378 case Triple::sparcel:
380 if (RelocM == Reloc::PIC_) {
381 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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 LSDAEncoding = dwarf::DW_EH_PE_absptr;
388 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
389 TTypeEncoding = dwarf::DW_EH_PE_absptr;
392 case Triple::sparcv9:
393 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
394 if (RelocM == Reloc::PIC_) {
395 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
396 dwarf::DW_EH_PE_sdata4;
397 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
398 dwarf::DW_EH_PE_sdata4;
400 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
401 TTypeEncoding = dwarf::DW_EH_PE_absptr;
404 case Triple::systemz:
405 // All currently-defined code models guarantee that 4-byte PC-relative
406 // values will be in range.
407 if (RelocM == Reloc::PIC_) {
408 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
409 dwarf::DW_EH_PE_sdata4;
410 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
411 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
412 dwarf::DW_EH_PE_sdata4;
414 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
415 LSDAEncoding = dwarf::DW_EH_PE_absptr;
416 TTypeEncoding = dwarf::DW_EH_PE_absptr;
423 unsigned EHSectionType = T.getArch() == Triple::x86_64
424 ? ELF::SHT_X86_64_UNWIND
427 // Solaris requires different flags for .eh_frame to seemingly every other
429 unsigned EHSectionFlags = ELF::SHF_ALLOC;
430 if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
431 EHSectionFlags |= ELF::SHF_WRITE;
434 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
435 ELF::SHF_WRITE | ELF::SHF_ALLOC);
437 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
438 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
440 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
441 ELF::SHF_WRITE | ELF::SHF_ALLOC);
444 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
447 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
448 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
450 TLSBSSSection = Ctx->getELFSection(
451 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
453 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
454 ELF::SHF_ALLOC | ELF::SHF_WRITE);
456 MergeableConst4Section =
457 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
458 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
460 MergeableConst8Section =
461 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
462 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
464 MergeableConst16Section =
465 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
466 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
468 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
469 ELF::SHF_ALLOC | ELF::SHF_WRITE);
471 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
472 ELF::SHF_ALLOC | ELF::SHF_WRITE);
474 // Exception Handling Sections.
476 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
477 // it contains relocatable pointers. In PIC mode, this is probably a big
478 // runtime hit for C++ apps. Either the contents of the LSDA need to be
479 // adjusted or this should be a data section.
480 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
483 COFFDebugSymbolsSection = nullptr;
485 // Debug Info Sections.
486 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
489 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
490 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
491 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
492 DwarfPubNamesSection =
493 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
494 DwarfPubTypesSection =
495 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
496 DwarfGnuPubNamesSection =
497 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
498 DwarfGnuPubTypesSection =
499 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
501 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
502 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
503 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
504 DwarfARangesSection =
505 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
507 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
509 // DWARF5 Experimental Debug Info
511 // Accelerator Tables
512 DwarfAccelNamesSection =
513 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
514 DwarfAccelObjCSection =
515 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
516 DwarfAccelNamespaceSection = Ctx->getELFSection(
517 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
518 DwarfAccelTypesSection =
519 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
522 DwarfInfoDWOSection =
523 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
524 DwarfTypesDWOSection =
525 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
526 DwarfAbbrevDWOSection =
527 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
529 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
530 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
531 DwarfLineDWOSection =
532 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
534 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
535 DwarfStrOffDWOSection =
536 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
538 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
541 DwarfCUIndexSection =
542 Ctx->getELFSection(".debug_cu_index", ELF::SHT_PROGBITS, 0);
543 DwarfTUIndexSection =
544 Ctx->getELFSection(".debug_tu_index", ELF::SHT_PROGBITS, 0);
547 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
550 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
553 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
556 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
557 EHFrameSection = Ctx->getCOFFSection(
558 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
559 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
560 SectionKind::getData());
562 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
564 CommDirectiveSupportsAlignment = true;
567 BSSSection = Ctx->getCOFFSection(
568 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
569 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
570 SectionKind::getBSS());
571 TextSection = Ctx->getCOFFSection(
573 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
574 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
575 COFF::IMAGE_SCN_MEM_READ,
576 SectionKind::getText());
577 DataSection = Ctx->getCOFFSection(
578 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
579 COFF::IMAGE_SCN_MEM_WRITE,
580 SectionKind::getData());
581 ReadOnlySection = Ctx->getCOFFSection(
582 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
583 SectionKind::getReadOnly());
585 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
587 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
588 COFF::IMAGE_SCN_MEM_READ,
589 SectionKind::getReadOnly());
591 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
592 COFF::IMAGE_SCN_MEM_READ,
593 SectionKind::getReadOnly());
595 StaticCtorSection = Ctx->getCOFFSection(
596 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
597 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
598 SectionKind::getData());
599 StaticDtorSection = Ctx->getCOFFSection(
600 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
601 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
602 SectionKind::getData());
605 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
606 // though it contains relocatable pointers. In PIC mode, this is probably a
607 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
608 // adjusted or this should be a data section.
609 assert(T.isOSWindows() && "Windows is the only supported COFF target");
610 if (T.getArch() == Triple::x86_64) {
611 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
612 LSDASection = nullptr;
614 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
615 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
616 COFF::IMAGE_SCN_MEM_READ,
617 SectionKind::getReadOnly());
621 COFFDebugSymbolsSection =
622 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
623 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
624 COFF::IMAGE_SCN_MEM_READ,
625 SectionKind::getMetadata());
627 DwarfAbbrevSection = Ctx->getCOFFSection(
629 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
630 COFF::IMAGE_SCN_MEM_READ,
631 SectionKind::getMetadata(), "section_abbrev");
632 DwarfInfoSection = Ctx->getCOFFSection(
634 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
635 COFF::IMAGE_SCN_MEM_READ,
636 SectionKind::getMetadata(), "section_info");
637 DwarfLineSection = Ctx->getCOFFSection(
639 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
640 COFF::IMAGE_SCN_MEM_READ,
641 SectionKind::getMetadata(), "section_line");
643 DwarfFrameSection = Ctx->getCOFFSection(
645 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
646 COFF::IMAGE_SCN_MEM_READ,
647 SectionKind::getMetadata());
648 DwarfPubNamesSection = Ctx->getCOFFSection(
650 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
651 COFF::IMAGE_SCN_MEM_READ,
652 SectionKind::getMetadata());
653 DwarfPubTypesSection = Ctx->getCOFFSection(
655 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
656 COFF::IMAGE_SCN_MEM_READ,
657 SectionKind::getMetadata());
658 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
659 ".debug_gnu_pubnames",
660 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
661 COFF::IMAGE_SCN_MEM_READ,
662 SectionKind::getMetadata());
663 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
664 ".debug_gnu_pubtypes",
665 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
666 COFF::IMAGE_SCN_MEM_READ,
667 SectionKind::getMetadata());
668 DwarfStrSection = Ctx->getCOFFSection(
670 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
671 COFF::IMAGE_SCN_MEM_READ,
672 SectionKind::getMetadata(), "info_string");
673 DwarfLocSection = Ctx->getCOFFSection(
675 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
676 COFF::IMAGE_SCN_MEM_READ,
677 SectionKind::getMetadata(), "section_debug_loc");
678 DwarfARangesSection = Ctx->getCOFFSection(
680 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
681 COFF::IMAGE_SCN_MEM_READ,
682 SectionKind::getMetadata());
683 DwarfRangesSection = Ctx->getCOFFSection(
685 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
686 COFF::IMAGE_SCN_MEM_READ,
687 SectionKind::getMetadata(), "debug_range");
688 DwarfInfoDWOSection = Ctx->getCOFFSection(
690 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
691 COFF::IMAGE_SCN_MEM_READ,
692 SectionKind::getMetadata(), "section_info_dwo");
693 DwarfTypesDWOSection = Ctx->getCOFFSection(
695 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
696 COFF::IMAGE_SCN_MEM_READ,
697 SectionKind::getMetadata(), "section_types_dwo");
698 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
700 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
701 COFF::IMAGE_SCN_MEM_READ,
702 SectionKind::getMetadata(), "section_abbrev_dwo");
703 DwarfStrDWOSection = Ctx->getCOFFSection(
705 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
706 COFF::IMAGE_SCN_MEM_READ,
707 SectionKind::getMetadata(), "skel_string");
708 DwarfLineDWOSection = Ctx->getCOFFSection(
710 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
711 COFF::IMAGE_SCN_MEM_READ,
712 SectionKind::getMetadata());
713 DwarfLocDWOSection = Ctx->getCOFFSection(
715 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
716 COFF::IMAGE_SCN_MEM_READ,
717 SectionKind::getMetadata(), "skel_loc");
718 DwarfStrOffDWOSection = Ctx->getCOFFSection(
719 ".debug_str_offsets.dwo",
720 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
721 COFF::IMAGE_SCN_MEM_READ,
722 SectionKind::getMetadata());
723 DwarfAddrSection = Ctx->getCOFFSection(
725 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
726 COFF::IMAGE_SCN_MEM_READ,
727 SectionKind::getMetadata(), "addr_sec");
728 DwarfCUIndexSection = Ctx->getCOFFSection(
730 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
731 COFF::IMAGE_SCN_MEM_READ,
732 SectionKind::getMetadata());
733 DwarfTUIndexSection = Ctx->getCOFFSection(
735 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
736 COFF::IMAGE_SCN_MEM_READ,
737 SectionKind::getMetadata());
738 DwarfAccelNamesSection = Ctx->getCOFFSection(
740 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
741 COFF::IMAGE_SCN_MEM_READ,
742 SectionKind::getMetadata(), "names_begin");
743 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
745 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
746 COFF::IMAGE_SCN_MEM_READ,
747 SectionKind::getMetadata(), "namespac_begin");
748 DwarfAccelTypesSection = Ctx->getCOFFSection(
750 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
751 COFF::IMAGE_SCN_MEM_READ,
752 SectionKind::getMetadata(), "types_begin");
753 DwarfAccelObjCSection = Ctx->getCOFFSection(
755 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
756 COFF::IMAGE_SCN_MEM_READ,
757 SectionKind::getMetadata(), "objc_begin");
759 DrectveSection = Ctx->getCOFFSection(
760 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
761 SectionKind::getMetadata());
763 PDataSection = Ctx->getCOFFSection(
764 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
765 SectionKind::getData());
767 XDataSection = Ctx->getCOFFSection(
768 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
769 SectionKind::getData());
771 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
772 SectionKind::getMetadata());
774 TLSDataSection = Ctx->getCOFFSection(
775 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
776 COFF::IMAGE_SCN_MEM_WRITE,
777 SectionKind::getData());
779 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
780 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
781 COFF::IMAGE_SCN_MEM_READ,
782 SectionKind::getReadOnly());
785 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
794 CommDirectiveSupportsAlignment = true;
795 SupportsWeakOmittedEHFrame = true;
796 SupportsCompactUnwindWithoutEHFrame = false;
797 OmitDwarfIfHaveCompactUnwind = false;
799 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
800 dwarf::DW_EH_PE_absptr;
802 CompactUnwindDwarfEHFrameOnly = 0;
804 EHFrameSection = nullptr; // Created on demand.
805 CompactUnwindSection = nullptr; // Used only by selected targets.
806 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
807 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
808 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
809 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
813 Triple::ArchType Arch = TT.getArch();
814 // FIXME: Checking for Arch here to filter out bogus triples such as
815 // cellspu-apple-darwin. Perhaps we should fix in Triple?
816 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
817 Arch == Triple::arm || Arch == Triple::thumb ||
818 Arch == Triple::aarch64 ||
819 Arch == Triple::ppc || Arch == Triple::ppc64 ||
820 Arch == Triple::UnknownArch) &&
821 TT.isOSBinFormatMachO()) {
823 initMachOMCObjectFileInfo(TT);
824 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
825 Arch == Triple::arm || Arch == Triple::thumb) &&
826 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
828 initCOFFMCObjectFileInfo(TT);
831 initELFMCObjectFileInfo(TT);
835 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
838 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
841 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
842 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,