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());
118 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
120 MachO::S_ATTR_PURE_INSTRUCTIONS,
121 SectionKind::getText());
123 = Ctx->getMachOSection("__TEXT", "__const_coal",
125 SectionKind::getReadOnly());
126 ConstDataSection // .const_data
127 = Ctx->getMachOSection("__DATA", "__const", 0,
128 SectionKind::getReadOnlyWithRel());
130 = Ctx->getMachOSection("__DATA","__datacoal_nt",
132 SectionKind::getDataRel());
134 = Ctx->getMachOSection("__DATA","__common",
136 SectionKind::getBSS());
138 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
139 SectionKind::getBSS());
142 LazySymbolPointerSection
143 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
144 MachO::S_LAZY_SYMBOL_POINTERS,
145 SectionKind::getMetadata());
146 NonLazySymbolPointerSection
147 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
148 MachO::S_NON_LAZY_SYMBOL_POINTERS,
149 SectionKind::getMetadata());
151 if (RelocM == Reloc::Static) {
153 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
154 SectionKind::getDataRel());
156 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
157 SectionKind::getDataRel());
160 = Ctx->getMachOSection("__DATA", "__mod_init_func",
161 MachO::S_MOD_INIT_FUNC_POINTERS,
162 SectionKind::getDataRel());
164 = Ctx->getMachOSection("__DATA", "__mod_term_func",
165 MachO::S_MOD_TERM_FUNC_POINTERS,
166 SectionKind::getDataRel());
169 // Exception Handling.
170 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
171 SectionKind::getReadOnlyWithRel());
173 COFFDebugSymbolsSection = nullptr;
175 if (useCompactUnwind(T)) {
176 CompactUnwindSection =
177 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
178 SectionKind::getReadOnly());
180 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
181 CompactUnwindDwarfEHFrameOnly = 0x04000000;
182 else if (T.getArch() == Triple::aarch64)
183 CompactUnwindDwarfEHFrameOnly = 0x03000000;
186 // Debug Information.
187 DwarfAccelNamesSection =
188 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
189 SectionKind::getMetadata(), "names_begin");
190 DwarfAccelObjCSection =
191 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
192 SectionKind::getMetadata(), "objc_begin");
193 // 16 character section limit...
194 DwarfAccelNamespaceSection =
195 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
196 SectionKind::getMetadata(), "namespac_begin");
197 DwarfAccelTypesSection =
198 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
199 SectionKind::getMetadata(), "types_begin");
202 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
203 SectionKind::getMetadata(), "section_abbrev");
205 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
206 SectionKind::getMetadata(), "section_info");
208 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
209 SectionKind::getMetadata(), "section_line");
211 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
212 SectionKind::getMetadata());
213 DwarfPubNamesSection =
214 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
215 SectionKind::getMetadata());
216 DwarfPubTypesSection =
217 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
218 SectionKind::getMetadata());
219 DwarfGnuPubNamesSection =
220 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
221 SectionKind::getMetadata());
222 DwarfGnuPubTypesSection =
223 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
224 SectionKind::getMetadata());
226 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
227 SectionKind::getMetadata(), "info_string");
229 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
230 SectionKind::getMetadata(), "section_debug_loc");
231 DwarfARangesSection =
232 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
233 SectionKind::getMetadata());
235 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
236 SectionKind::getMetadata(), "debug_range");
237 DwarfDebugInlineSection =
238 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
239 SectionKind::getMetadata());
240 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
241 0, SectionKind::getMetadata());
243 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
244 0, SectionKind::getMetadata());
246 TLSExtraDataSection = TLSTLVSection;
249 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
250 switch (T.getArch()) {
253 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
256 case Triple::mips64el:
257 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
260 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
261 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
262 : dwarf::DW_EH_PE_sdata4);
265 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
269 switch (T.getArch()) {
273 case Triple::thumbeb:
274 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
276 // Fallthrough if not using EHABI
279 PersonalityEncoding = (RelocM == Reloc::PIC_)
280 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
281 : dwarf::DW_EH_PE_absptr;
282 LSDAEncoding = (RelocM == Reloc::PIC_)
283 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
284 : dwarf::DW_EH_PE_absptr;
285 TTypeEncoding = (RelocM == Reloc::PIC_)
286 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
287 : dwarf::DW_EH_PE_absptr;
290 if (RelocM == Reloc::PIC_) {
291 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
292 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
293 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
294 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
295 (CMModel == CodeModel::Small
296 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
297 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
298 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
299 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
301 PersonalityEncoding =
302 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
303 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
304 LSDAEncoding = (CMModel == CodeModel::Small)
305 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
306 TTypeEncoding = (CMModel == CodeModel::Small)
307 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
310 case Triple::aarch64:
311 case Triple::aarch64_be:
312 // The small model guarantees static code/data size < 4GB, but not where it
313 // will be in memory. Most of these could end up >2GB away so even a signed
314 // pc-relative 32-bit address is insufficient, theoretically.
315 if (RelocM == Reloc::PIC_) {
316 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
317 dwarf::DW_EH_PE_sdata8;
318 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
319 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
320 dwarf::DW_EH_PE_sdata8;
322 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
323 LSDAEncoding = dwarf::DW_EH_PE_absptr;
324 TTypeEncoding = dwarf::DW_EH_PE_absptr;
330 case Triple::mips64el:
331 // MIPS uses indirect pointer to refer personality functions and types, so
332 // that the eh_frame section can be read-only. DW.ref.personality will be
333 // generated for relocation.
334 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
335 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
336 // identify N64 from just a triple.
337 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
338 dwarf::DW_EH_PE_sdata4;
339 // We don't support PC-relative LSDA references in GAS so we use the default
340 // DW_EH_PE_absptr for those.
343 case Triple::ppc64le:
344 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
345 dwarf::DW_EH_PE_udata8;
346 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
347 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
348 dwarf::DW_EH_PE_udata8;
350 case Triple::sparcel:
352 if (RelocM == Reloc::PIC_) {
353 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
354 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
355 dwarf::DW_EH_PE_sdata4;
356 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
357 dwarf::DW_EH_PE_sdata4;
359 LSDAEncoding = dwarf::DW_EH_PE_absptr;
360 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
361 TTypeEncoding = dwarf::DW_EH_PE_absptr;
364 case Triple::sparcv9:
365 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
366 if (RelocM == Reloc::PIC_) {
367 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
368 dwarf::DW_EH_PE_sdata4;
369 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
370 dwarf::DW_EH_PE_sdata4;
372 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
373 TTypeEncoding = dwarf::DW_EH_PE_absptr;
376 case Triple::systemz:
377 // All currently-defined code models guarantee that 4-byte PC-relative
378 // values will be in range.
379 if (RelocM == Reloc::PIC_) {
380 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
381 dwarf::DW_EH_PE_sdata4;
382 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
383 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
384 dwarf::DW_EH_PE_sdata4;
386 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
387 LSDAEncoding = dwarf::DW_EH_PE_absptr;
388 TTypeEncoding = dwarf::DW_EH_PE_absptr;
395 // Solaris requires different flags for .eh_frame to seemingly every other
397 EHSectionType = ELF::SHT_PROGBITS;
398 EHSectionFlags = ELF::SHF_ALLOC;
399 if (T.isOSSolaris()) {
400 if (T.getArch() == Triple::x86_64)
401 EHSectionType = ELF::SHT_X86_64_UNWIND;
403 EHSectionFlags |= ELF::SHF_WRITE;
407 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
408 ELF::SHF_WRITE | ELF::SHF_ALLOC);
410 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
411 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
413 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
414 ELF::SHF_WRITE | ELF::SHF_ALLOC);
417 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
420 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
421 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
423 TLSBSSSection = Ctx->getELFSection(
424 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
426 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
427 ELF::SHF_ALLOC | ELF::SHF_WRITE);
429 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
430 ELF::SHF_ALLOC | ELF::SHF_WRITE);
432 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
433 ELF::SHF_ALLOC | ELF::SHF_WRITE);
435 DataRelROLocalSection = Ctx->getELFSection(
436 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
438 MergeableConst4Section =
439 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
440 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
442 MergeableConst8Section =
443 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
444 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
446 MergeableConst16Section =
447 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
448 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
450 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
451 ELF::SHF_ALLOC | ELF::SHF_WRITE);
453 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
454 ELF::SHF_ALLOC | ELF::SHF_WRITE);
456 // Exception Handling Sections.
458 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
459 // it contains relocatable pointers. In PIC mode, this is probably a big
460 // runtime hit for C++ apps. Either the contents of the LSDA need to be
461 // adjusted or this should be a data section.
462 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
465 COFFDebugSymbolsSection = nullptr;
467 // Debug Info Sections.
468 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
471 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
472 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
473 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
474 DwarfPubNamesSection =
475 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
476 DwarfPubTypesSection =
477 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
478 DwarfGnuPubNamesSection =
479 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
480 DwarfGnuPubTypesSection =
481 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
483 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
484 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
485 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
486 DwarfARangesSection =
487 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
489 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
491 // DWARF5 Experimental Debug Info
493 // Accelerator Tables
494 DwarfAccelNamesSection =
495 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
496 DwarfAccelObjCSection =
497 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
498 DwarfAccelNamespaceSection = Ctx->getELFSection(
499 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
500 DwarfAccelTypesSection =
501 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
504 DwarfInfoDWOSection =
505 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
506 DwarfTypesDWOSection =
507 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
508 DwarfAbbrevDWOSection =
509 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
511 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
512 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
513 DwarfLineDWOSection =
514 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
516 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
517 DwarfStrOffDWOSection =
518 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
520 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
523 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
526 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
529 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
530 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
532 CommDirectiveSupportsAlignment = true;
535 BSSSection = Ctx->getCOFFSection(
536 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
537 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
538 SectionKind::getBSS());
539 TextSection = Ctx->getCOFFSection(
541 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
542 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
543 COFF::IMAGE_SCN_MEM_READ,
544 SectionKind::getText());
545 DataSection = Ctx->getCOFFSection(
546 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
547 COFF::IMAGE_SCN_MEM_WRITE,
548 SectionKind::getDataRel());
549 ReadOnlySection = Ctx->getCOFFSection(
550 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
551 SectionKind::getReadOnly());
553 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
555 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
556 COFF::IMAGE_SCN_MEM_READ,
557 SectionKind::getReadOnly());
559 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
560 COFF::IMAGE_SCN_MEM_READ,
561 SectionKind::getReadOnly());
563 StaticCtorSection = Ctx->getCOFFSection(
564 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
565 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
566 SectionKind::getDataRel());
567 StaticDtorSection = Ctx->getCOFFSection(
568 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
569 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
570 SectionKind::getDataRel());
573 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
574 // though it contains relocatable pointers. In PIC mode, this is probably a
575 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
576 // adjusted or this should be a data section.
577 assert(T.isOSWindows() && "Windows is the only supported COFF target");
578 if (T.getArch() == Triple::x86_64) {
579 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
580 LSDASection = nullptr;
582 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
583 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
584 COFF::IMAGE_SCN_MEM_READ,
585 SectionKind::getReadOnly());
589 COFFDebugSymbolsSection =
590 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
591 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
592 COFF::IMAGE_SCN_MEM_READ,
593 SectionKind::getMetadata());
595 DwarfAbbrevSection = Ctx->getCOFFSection(
597 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
598 COFF::IMAGE_SCN_MEM_READ,
599 SectionKind::getMetadata(), "section_abbrev");
600 DwarfInfoSection = Ctx->getCOFFSection(
602 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
603 COFF::IMAGE_SCN_MEM_READ,
604 SectionKind::getMetadata(), "section_info");
605 DwarfLineSection = Ctx->getCOFFSection(
607 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
608 COFF::IMAGE_SCN_MEM_READ,
609 SectionKind::getMetadata(), "section_line");
611 DwarfFrameSection = Ctx->getCOFFSection(
613 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
614 COFF::IMAGE_SCN_MEM_READ,
615 SectionKind::getMetadata());
616 DwarfPubNamesSection = Ctx->getCOFFSection(
618 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
619 COFF::IMAGE_SCN_MEM_READ,
620 SectionKind::getMetadata());
621 DwarfPubTypesSection = Ctx->getCOFFSection(
623 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
624 COFF::IMAGE_SCN_MEM_READ,
625 SectionKind::getMetadata());
626 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
627 ".debug_gnu_pubnames",
628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
629 COFF::IMAGE_SCN_MEM_READ,
630 SectionKind::getMetadata());
631 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
632 ".debug_gnu_pubtypes",
633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
634 COFF::IMAGE_SCN_MEM_READ,
635 SectionKind::getMetadata());
636 DwarfStrSection = Ctx->getCOFFSection(
638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ,
640 SectionKind::getMetadata(), "info_string");
641 DwarfLocSection = Ctx->getCOFFSection(
643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
644 COFF::IMAGE_SCN_MEM_READ,
645 SectionKind::getMetadata(), "section_debug_loc");
646 DwarfARangesSection = Ctx->getCOFFSection(
648 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
649 COFF::IMAGE_SCN_MEM_READ,
650 SectionKind::getMetadata());
651 DwarfRangesSection = Ctx->getCOFFSection(
653 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
654 COFF::IMAGE_SCN_MEM_READ,
655 SectionKind::getMetadata(), "debug_range");
656 DwarfInfoDWOSection = Ctx->getCOFFSection(
658 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
659 COFF::IMAGE_SCN_MEM_READ,
660 SectionKind::getMetadata(), "section_info_dwo");
661 DwarfTypesDWOSection = Ctx->getCOFFSection(
663 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
664 COFF::IMAGE_SCN_MEM_READ,
665 SectionKind::getMetadata(), "section_types_dwo");
666 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
668 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
669 COFF::IMAGE_SCN_MEM_READ,
670 SectionKind::getMetadata(), "section_abbrev_dwo");
671 DwarfStrDWOSection = Ctx->getCOFFSection(
673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
674 COFF::IMAGE_SCN_MEM_READ,
675 SectionKind::getMetadata(), "skel_string");
676 DwarfLineDWOSection = Ctx->getCOFFSection(
678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
679 COFF::IMAGE_SCN_MEM_READ,
680 SectionKind::getMetadata());
681 DwarfLocDWOSection = Ctx->getCOFFSection(
683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
684 COFF::IMAGE_SCN_MEM_READ,
685 SectionKind::getMetadata(), "skel_loc");
686 DwarfStrOffDWOSection = Ctx->getCOFFSection(
687 ".debug_str_offsets.dwo",
688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
689 COFF::IMAGE_SCN_MEM_READ,
690 SectionKind::getMetadata());
691 DwarfAddrSection = Ctx->getCOFFSection(
693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
694 COFF::IMAGE_SCN_MEM_READ,
695 SectionKind::getMetadata(), "addr_sec");
696 DwarfAccelNamesSection = Ctx->getCOFFSection(
698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
699 COFF::IMAGE_SCN_MEM_READ,
700 SectionKind::getMetadata(), "names_begin");
701 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
704 COFF::IMAGE_SCN_MEM_READ,
705 SectionKind::getMetadata(), "namespac_begin");
706 DwarfAccelTypesSection = Ctx->getCOFFSection(
708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
709 COFF::IMAGE_SCN_MEM_READ,
710 SectionKind::getMetadata(), "types_begin");
711 DwarfAccelObjCSection = Ctx->getCOFFSection(
713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
714 COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getMetadata(), "objc_begin");
717 DrectveSection = Ctx->getCOFFSection(
718 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
719 SectionKind::getMetadata());
721 PDataSection = Ctx->getCOFFSection(
722 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
723 SectionKind::getDataRel());
725 XDataSection = Ctx->getCOFFSection(
726 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
727 SectionKind::getDataRel());
729 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
730 SectionKind::getMetadata());
732 TLSDataSection = Ctx->getCOFFSection(
733 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
734 COFF::IMAGE_SCN_MEM_WRITE,
735 SectionKind::getDataRel());
737 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
738 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
739 COFF::IMAGE_SCN_MEM_READ,
740 SectionKind::getReadOnly());
743 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
752 CommDirectiveSupportsAlignment = true;
753 SupportsWeakOmittedEHFrame = true;
754 SupportsCompactUnwindWithoutEHFrame = false;
756 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
757 dwarf::DW_EH_PE_absptr;
759 CompactUnwindDwarfEHFrameOnly = 0;
761 EHFrameSection = nullptr; // Created on demand.
762 CompactUnwindSection = nullptr; // Used only by selected targets.
763 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
764 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
765 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
766 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
770 Triple::ArchType Arch = TT.getArch();
771 // FIXME: Checking for Arch here to filter out bogus triples such as
772 // cellspu-apple-darwin. Perhaps we should fix in Triple?
773 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
774 Arch == Triple::arm || Arch == Triple::thumb ||
775 Arch == Triple::aarch64 ||
776 Arch == Triple::ppc || Arch == Triple::ppc64 ||
777 Arch == Triple::UnknownArch) &&
778 TT.isOSBinFormatMachO()) {
780 initMachOMCObjectFileInfo(TT);
781 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
782 Arch == Triple::arm || Arch == Triple::thumb) &&
783 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
785 initCOFFMCObjectFileInfo(TT);
788 initELFMCObjectFileInfo(TT);
792 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
795 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
798 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
799 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
803 void MCObjectFileInfo::InitEHFrameSection() {
806 Ctx->getMachOSection("__TEXT", "__eh_frame",
808 MachO::S_ATTR_NO_TOC |
809 MachO::S_ATTR_STRIP_STATIC_SYMS |
810 MachO::S_ATTR_LIVE_SUPPORT,
811 SectionKind::getReadOnly());
812 else if (Env == IsELF)
814 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
817 Ctx->getCOFFSection(".eh_frame",
818 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
819 COFF::IMAGE_SCN_MEM_READ |
820 COFF::IMAGE_SCN_MEM_WRITE,
821 SectionKind::getDataRel());