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"
22 static bool useCompactUnwind(const Triple &T) {
27 // aarch64 always has it.
28 if (T.getArch() == Triple::aarch64)
31 // Use it on newer version of OS X.
32 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
35 // And the iOS simulator.
37 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
43 void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
45 SupportsWeakOmittedEHFrame = false;
47 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
48 SupportsCompactUnwindWithoutEHFrame = true;
50 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
51 | dwarf::DW_EH_PE_sdata4;
52 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
53 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
54 dwarf::DW_EH_PE_sdata4;
56 // .comm doesn't support alignment before Leopard.
57 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
58 CommDirectiveSupportsAlignment = false;
61 = Ctx->getMachOSection("__TEXT", "__text",
62 MachO::S_ATTR_PURE_INSTRUCTIONS,
63 SectionKind::getText());
65 = Ctx->getMachOSection("__DATA", "__data", 0,
66 SectionKind::getDataRel());
68 // BSSSection might not be expected initialized on msvc.
71 TLSDataSection // .tdata
72 = Ctx->getMachOSection("__DATA", "__thread_data",
73 MachO::S_THREAD_LOCAL_REGULAR,
74 SectionKind::getDataRel());
75 TLSBSSSection // .tbss
76 = Ctx->getMachOSection("__DATA", "__thread_bss",
77 MachO::S_THREAD_LOCAL_ZEROFILL,
78 SectionKind::getThreadBSS());
80 // TODO: Verify datarel below.
82 = Ctx->getMachOSection("__DATA", "__thread_vars",
83 MachO::S_THREAD_LOCAL_VARIABLES,
84 SectionKind::getDataRel());
87 = Ctx->getMachOSection("__DATA", "__thread_init",
88 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
89 SectionKind::getDataRel());
91 CStringSection // .cstring
92 = Ctx->getMachOSection("__TEXT", "__cstring",
93 MachO::S_CSTRING_LITERALS,
94 SectionKind::getMergeable1ByteCString());
96 = Ctx->getMachOSection("__TEXT","__ustring", 0,
97 SectionKind::getMergeable2ByteCString());
98 FourByteConstantSection // .literal4
99 = Ctx->getMachOSection("__TEXT", "__literal4",
100 MachO::S_4BYTE_LITERALS,
101 SectionKind::getMergeableConst4());
102 EightByteConstantSection // .literal8
103 = Ctx->getMachOSection("__TEXT", "__literal8",
104 MachO::S_8BYTE_LITERALS,
105 SectionKind::getMergeableConst8());
107 SixteenByteConstantSection // .literal16
108 = Ctx->getMachOSection("__TEXT", "__literal16",
109 MachO::S_16BYTE_LITERALS,
110 SectionKind::getMergeableConst16());
112 ReadOnlySection // .const
113 = Ctx->getMachOSection("__TEXT", "__const", 0,
114 SectionKind::getReadOnly());
117 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
119 MachO::S_ATTR_PURE_INSTRUCTIONS,
120 SectionKind::getText());
122 = Ctx->getMachOSection("__TEXT", "__const_coal",
124 SectionKind::getReadOnly());
125 ConstDataSection // .const_data
126 = Ctx->getMachOSection("__DATA", "__const", 0,
127 SectionKind::getReadOnlyWithRel());
129 = Ctx->getMachOSection("__DATA","__datacoal_nt",
131 SectionKind::getDataRel());
133 = Ctx->getMachOSection("__DATA","__common",
135 SectionKind::getBSS());
137 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
138 SectionKind::getBSS());
141 LazySymbolPointerSection
142 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
143 MachO::S_LAZY_SYMBOL_POINTERS,
144 SectionKind::getMetadata());
145 NonLazySymbolPointerSection
146 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
147 MachO::S_NON_LAZY_SYMBOL_POINTERS,
148 SectionKind::getMetadata());
150 if (RelocM == Reloc::Static) {
152 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
153 SectionKind::getDataRel());
155 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
156 SectionKind::getDataRel());
159 = Ctx->getMachOSection("__DATA", "__mod_init_func",
160 MachO::S_MOD_INIT_FUNC_POINTERS,
161 SectionKind::getDataRel());
163 = Ctx->getMachOSection("__DATA", "__mod_term_func",
164 MachO::S_MOD_TERM_FUNC_POINTERS,
165 SectionKind::getDataRel());
168 // Exception Handling.
169 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
170 SectionKind::getReadOnlyWithRel());
172 COFFDebugSymbolsSection = nullptr;
174 if (useCompactUnwind(T)) {
175 CompactUnwindSection =
176 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
177 SectionKind::getReadOnly());
179 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
180 CompactUnwindDwarfEHFrameOnly = 0x04000000;
181 else if (T.getArch() == Triple::aarch64)
182 CompactUnwindDwarfEHFrameOnly = 0x03000000;
185 // Debug Information.
186 DwarfAccelNamesSection =
187 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
188 SectionKind::getMetadata(), "names_begin");
189 DwarfAccelObjCSection =
190 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
191 SectionKind::getMetadata(), "objc_begin");
192 // 16 character section limit...
193 DwarfAccelNamespaceSection =
194 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
195 SectionKind::getMetadata(), "namespac_begin");
196 DwarfAccelTypesSection =
197 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
198 SectionKind::getMetadata(), "types_begin");
201 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
202 SectionKind::getMetadata(), "section_abbrev");
204 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
205 SectionKind::getMetadata(), "section_info");
207 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
208 SectionKind::getMetadata(), "section_line");
210 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
211 SectionKind::getMetadata());
212 DwarfPubNamesSection =
213 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
214 SectionKind::getMetadata());
215 DwarfPubTypesSection =
216 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
217 SectionKind::getMetadata());
218 DwarfGnuPubNamesSection =
219 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
220 SectionKind::getMetadata());
221 DwarfGnuPubTypesSection =
222 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
223 SectionKind::getMetadata());
225 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
226 SectionKind::getMetadata(), "info_string");
228 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
229 SectionKind::getMetadata(), "section_debug_loc");
230 DwarfARangesSection =
231 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
232 SectionKind::getMetadata());
234 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
235 SectionKind::getMetadata(), "debug_range");
236 DwarfDebugInlineSection =
237 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
238 SectionKind::getMetadata());
239 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
240 0, SectionKind::getMetadata());
242 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
243 0, SectionKind::getMetadata());
245 TLSExtraDataSection = TLSTLVSection;
248 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
249 switch (T.getArch()) {
252 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
255 case Triple::mips64el:
256 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
259 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
260 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
261 : 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;
408 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
409 ELF::SHF_WRITE | ELF::SHF_ALLOC);
411 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
412 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
414 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
415 ELF::SHF_WRITE | ELF::SHF_ALLOC);
418 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
421 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
422 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
424 TLSBSSSection = Ctx->getELFSection(
425 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
427 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
428 ELF::SHF_ALLOC | ELF::SHF_WRITE);
430 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
431 ELF::SHF_ALLOC | ELF::SHF_WRITE);
433 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
434 ELF::SHF_ALLOC | ELF::SHF_WRITE);
436 DataRelROLocalSection = Ctx->getELFSection(
437 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
439 MergeableConst4Section =
440 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
441 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
443 MergeableConst8Section =
444 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
447 MergeableConst16Section =
448 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
449 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
451 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
452 ELF::SHF_ALLOC | ELF::SHF_WRITE);
454 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
455 ELF::SHF_ALLOC | ELF::SHF_WRITE);
457 // Exception Handling Sections.
459 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
460 // it contains relocatable pointers. In PIC mode, this is probably a big
461 // runtime hit for C++ apps. Either the contents of the LSDA need to be
462 // adjusted or this should be a data section.
463 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
466 COFFDebugSymbolsSection = nullptr;
468 // Debug Info Sections.
469 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
472 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
473 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
474 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
475 DwarfPubNamesSection =
476 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
477 DwarfPubTypesSection =
478 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
479 DwarfGnuPubNamesSection =
480 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
481 DwarfGnuPubTypesSection =
482 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
484 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
485 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
486 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
487 DwarfARangesSection =
488 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
490 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
492 // DWARF5 Experimental Debug Info
494 // Accelerator Tables
495 DwarfAccelNamesSection =
496 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
497 DwarfAccelObjCSection =
498 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
499 DwarfAccelNamespaceSection = Ctx->getELFSection(
500 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
501 DwarfAccelTypesSection =
502 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
505 DwarfInfoDWOSection =
506 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
507 DwarfTypesDWOSection =
508 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
509 DwarfAbbrevDWOSection =
510 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
512 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
513 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
514 DwarfLineDWOSection =
515 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
517 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
518 DwarfStrOffDWOSection =
519 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
521 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
524 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
527 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
530 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
531 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
533 CommDirectiveSupportsAlignment = true;
536 BSSSection = Ctx->getCOFFSection(
537 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
538 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
539 SectionKind::getBSS());
540 TextSection = Ctx->getCOFFSection(
542 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
543 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
544 COFF::IMAGE_SCN_MEM_READ,
545 SectionKind::getText());
546 DataSection = Ctx->getCOFFSection(
547 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
548 COFF::IMAGE_SCN_MEM_WRITE,
549 SectionKind::getDataRel());
550 ReadOnlySection = Ctx->getCOFFSection(
551 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
552 SectionKind::getReadOnly());
554 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
556 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
557 COFF::IMAGE_SCN_MEM_READ,
558 SectionKind::getReadOnly());
560 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
561 COFF::IMAGE_SCN_MEM_READ,
562 SectionKind::getReadOnly());
564 StaticCtorSection = Ctx->getCOFFSection(
565 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
566 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
567 SectionKind::getDataRel());
568 StaticDtorSection = Ctx->getCOFFSection(
569 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
570 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
571 SectionKind::getDataRel());
574 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
575 // though it contains relocatable pointers. In PIC mode, this is probably a
576 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
577 // adjusted or this should be a data section.
578 assert(T.isOSWindows() && "Windows is the only supported COFF target");
579 if (T.getArch() == Triple::x86_64) {
580 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
583 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
584 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
585 COFF::IMAGE_SCN_MEM_READ,
586 SectionKind::getReadOnly());
590 COFFDebugSymbolsSection =
591 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
592 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
593 COFF::IMAGE_SCN_MEM_READ,
594 SectionKind::getMetadata());
596 DwarfAbbrevSection = Ctx->getCOFFSection(
598 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
599 COFF::IMAGE_SCN_MEM_READ,
600 SectionKind::getMetadata(), "section_abbrev");
601 DwarfInfoSection = Ctx->getCOFFSection(
603 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
604 COFF::IMAGE_SCN_MEM_READ,
605 SectionKind::getMetadata(), "section_info");
606 DwarfLineSection = Ctx->getCOFFSection(
608 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
609 COFF::IMAGE_SCN_MEM_READ,
610 SectionKind::getMetadata(), "section_line");
612 DwarfFrameSection = Ctx->getCOFFSection(
614 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
615 COFF::IMAGE_SCN_MEM_READ,
616 SectionKind::getMetadata());
617 DwarfPubNamesSection = Ctx->getCOFFSection(
619 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
620 COFF::IMAGE_SCN_MEM_READ,
621 SectionKind::getMetadata());
622 DwarfPubTypesSection = Ctx->getCOFFSection(
624 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
625 COFF::IMAGE_SCN_MEM_READ,
626 SectionKind::getMetadata());
627 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
628 ".debug_gnu_pubnames",
629 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
630 COFF::IMAGE_SCN_MEM_READ,
631 SectionKind::getMetadata());
632 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
633 ".debug_gnu_pubtypes",
634 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
635 COFF::IMAGE_SCN_MEM_READ,
636 SectionKind::getMetadata());
637 DwarfStrSection = Ctx->getCOFFSection(
639 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
640 COFF::IMAGE_SCN_MEM_READ,
641 SectionKind::getMetadata(), "info_string");
642 DwarfLocSection = Ctx->getCOFFSection(
644 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
645 COFF::IMAGE_SCN_MEM_READ,
646 SectionKind::getMetadata(), "section_debug_loc");
647 DwarfARangesSection = Ctx->getCOFFSection(
649 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
650 COFF::IMAGE_SCN_MEM_READ,
651 SectionKind::getMetadata());
652 DwarfRangesSection = Ctx->getCOFFSection(
654 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
655 COFF::IMAGE_SCN_MEM_READ,
656 SectionKind::getMetadata(), "debug_range");
657 DwarfInfoDWOSection = Ctx->getCOFFSection(
659 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
660 COFF::IMAGE_SCN_MEM_READ,
661 SectionKind::getMetadata(), "section_info_dwo");
662 DwarfTypesDWOSection = Ctx->getCOFFSection(
664 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
665 COFF::IMAGE_SCN_MEM_READ,
666 SectionKind::getMetadata(), "section_types_dwo");
667 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
670 COFF::IMAGE_SCN_MEM_READ,
671 SectionKind::getMetadata(), "section_abbrev_dwo");
672 DwarfStrDWOSection = Ctx->getCOFFSection(
674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
675 COFF::IMAGE_SCN_MEM_READ,
676 SectionKind::getMetadata(), "skel_string");
677 DwarfLineDWOSection = Ctx->getCOFFSection(
679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
680 COFF::IMAGE_SCN_MEM_READ,
681 SectionKind::getMetadata());
682 DwarfLocDWOSection = Ctx->getCOFFSection(
684 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
685 COFF::IMAGE_SCN_MEM_READ,
686 SectionKind::getMetadata(), "skel_loc");
687 DwarfStrOffDWOSection = Ctx->getCOFFSection(
688 ".debug_str_offsets.dwo",
689 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
690 COFF::IMAGE_SCN_MEM_READ,
691 SectionKind::getMetadata());
692 DwarfAddrSection = Ctx->getCOFFSection(
694 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
695 COFF::IMAGE_SCN_MEM_READ,
696 SectionKind::getMetadata(), "addr_sec");
697 DwarfAccelNamesSection = Ctx->getCOFFSection(
699 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
700 COFF::IMAGE_SCN_MEM_READ,
701 SectionKind::getMetadata(), "names_begin");
702 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
704 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
705 COFF::IMAGE_SCN_MEM_READ,
706 SectionKind::getMetadata(), "namespac_begin");
707 DwarfAccelTypesSection = Ctx->getCOFFSection(
709 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
710 COFF::IMAGE_SCN_MEM_READ,
711 SectionKind::getMetadata(), "types_begin");
712 DwarfAccelObjCSection = Ctx->getCOFFSection(
714 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
715 COFF::IMAGE_SCN_MEM_READ,
716 SectionKind::getMetadata(), "objc_begin");
718 DrectveSection = Ctx->getCOFFSection(
719 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
720 SectionKind::getMetadata());
722 PDataSection = Ctx->getCOFFSection(
723 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
724 SectionKind::getDataRel());
726 XDataSection = Ctx->getCOFFSection(
727 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
728 SectionKind::getDataRel());
730 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
731 SectionKind::getMetadata());
733 TLSDataSection = Ctx->getCOFFSection(
734 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
735 COFF::IMAGE_SCN_MEM_WRITE,
736 SectionKind::getDataRel());
738 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
739 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
740 COFF::IMAGE_SCN_MEM_READ,
741 SectionKind::getReadOnly());
744 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
753 CommDirectiveSupportsAlignment = true;
754 SupportsWeakOmittedEHFrame = true;
755 SupportsCompactUnwindWithoutEHFrame = false;
757 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
758 dwarf::DW_EH_PE_absptr;
760 CompactUnwindDwarfEHFrameOnly = 0;
762 EHFrameSection = nullptr; // Created on demand.
763 CompactUnwindSection = nullptr; // Used only by selected targets.
764 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
765 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
766 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
767 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
771 Triple::ArchType Arch = TT.getArch();
772 // FIXME: Checking for Arch here to filter out bogus triples such as
773 // cellspu-apple-darwin. Perhaps we should fix in Triple?
774 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
775 Arch == Triple::arm || Arch == Triple::thumb ||
776 Arch == Triple::aarch64 ||
777 Arch == Triple::ppc || Arch == Triple::ppc64 ||
778 Arch == Triple::UnknownArch) &&
779 TT.isOSBinFormatMachO()) {
781 initMachOMCObjectFileInfo(TT);
782 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
783 Arch == Triple::arm || Arch == Triple::thumb) &&
784 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
786 initCOFFMCObjectFileInfo(TT);
789 initELFMCObjectFileInfo(TT);
793 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM,
796 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx);
799 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
800 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
804 void MCObjectFileInfo::InitEHFrameSection() {
807 Ctx->getMachOSection("__TEXT", "__eh_frame",
809 MachO::S_ATTR_NO_TOC |
810 MachO::S_ATTR_STRIP_STATIC_SYMS |
811 MachO::S_ATTR_LIVE_SUPPORT,
812 SectionKind::getReadOnly());
813 else if (Env == IsELF)
815 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
818 Ctx->getCOFFSection(".eh_frame",
819 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
820 COFF::IMAGE_SCN_MEM_READ |
821 COFF::IMAGE_SCN_MEM_WRITE,
822 SectionKind::getDataRel());