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/MCContext.h"
14 #include "llvm/MC/MCSection.h"
15 #include "llvm/MC/MCSectionCOFF.h"
16 #include "llvm/MC/MCSectionELF.h"
17 #include "llvm/MC/MCSectionMachO.h"
20 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
22 IsFunctionEHFrameSymbolPrivate = false;
23 SupportsWeakOmittedEHFrame = false;
25 if (T.isOSDarwin() && T.getArch() == Triple::arm64)
26 SupportsCompactUnwindWithoutEHFrame = true;
28 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
29 | dwarf::DW_EH_PE_sdata4;
30 LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
31 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
32 dwarf::DW_EH_PE_sdata4;
34 // .comm doesn't support alignment before Leopard.
35 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
36 CommDirectiveSupportsAlignment = false;
39 = Ctx->getMachOSection("__TEXT", "__text",
40 MachO::S_ATTR_PURE_INSTRUCTIONS,
41 SectionKind::getText());
43 = Ctx->getMachOSection("__DATA", "__data", 0,
44 SectionKind::getDataRel());
46 // BSSSection might not be expected initialized on msvc.
49 TLSDataSection // .tdata
50 = Ctx->getMachOSection("__DATA", "__thread_data",
51 MachO::S_THREAD_LOCAL_REGULAR,
52 SectionKind::getDataRel());
53 TLSBSSSection // .tbss
54 = Ctx->getMachOSection("__DATA", "__thread_bss",
55 MachO::S_THREAD_LOCAL_ZEROFILL,
56 SectionKind::getThreadBSS());
58 // TODO: Verify datarel below.
60 = Ctx->getMachOSection("__DATA", "__thread_vars",
61 MachO::S_THREAD_LOCAL_VARIABLES,
62 SectionKind::getDataRel());
65 = Ctx->getMachOSection("__DATA", "__thread_init",
66 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
67 SectionKind::getDataRel());
69 CStringSection // .cstring
70 = Ctx->getMachOSection("__TEXT", "__cstring",
71 MachO::S_CSTRING_LITERALS,
72 SectionKind::getMergeable1ByteCString());
74 = Ctx->getMachOSection("__TEXT","__ustring", 0,
75 SectionKind::getMergeable2ByteCString());
76 FourByteConstantSection // .literal4
77 = Ctx->getMachOSection("__TEXT", "__literal4",
78 MachO::S_4BYTE_LITERALS,
79 SectionKind::getMergeableConst4());
80 EightByteConstantSection // .literal8
81 = Ctx->getMachOSection("__TEXT", "__literal8",
82 MachO::S_8BYTE_LITERALS,
83 SectionKind::getMergeableConst8());
85 SixteenByteConstantSection // .literal16
86 = Ctx->getMachOSection("__TEXT", "__literal16",
87 MachO::S_16BYTE_LITERALS,
88 SectionKind::getMergeableConst16());
90 ReadOnlySection // .const
91 = Ctx->getMachOSection("__TEXT", "__const", 0,
92 SectionKind::getReadOnly());
95 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
97 MachO::S_ATTR_PURE_INSTRUCTIONS,
98 SectionKind::getText());
100 = Ctx->getMachOSection("__TEXT", "__const_coal",
102 SectionKind::getReadOnly());
103 ConstDataSection // .const_data
104 = Ctx->getMachOSection("__DATA", "__const", 0,
105 SectionKind::getReadOnlyWithRel());
107 = Ctx->getMachOSection("__DATA","__datacoal_nt",
109 SectionKind::getDataRel());
111 = Ctx->getMachOSection("__DATA","__common",
113 SectionKind::getBSS());
115 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
116 SectionKind::getBSS());
119 LazySymbolPointerSection
120 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
121 MachO::S_LAZY_SYMBOL_POINTERS,
122 SectionKind::getMetadata());
123 NonLazySymbolPointerSection
124 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
125 MachO::S_NON_LAZY_SYMBOL_POINTERS,
126 SectionKind::getMetadata());
128 if (RelocM == Reloc::Static) {
130 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
131 SectionKind::getDataRel());
133 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
134 SectionKind::getDataRel());
137 = Ctx->getMachOSection("__DATA", "__mod_init_func",
138 MachO::S_MOD_INIT_FUNC_POINTERS,
139 SectionKind::getDataRel());
141 = Ctx->getMachOSection("__DATA", "__mod_term_func",
142 MachO::S_MOD_TERM_FUNC_POINTERS,
143 SectionKind::getDataRel());
146 // Exception Handling.
147 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
148 SectionKind::getReadOnlyWithRel());
150 COFFDebugSymbolsSection = nullptr;
152 if ((T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) ||
153 (T.isOSDarwin() && T.getArch() == Triple::arm64)) {
154 CompactUnwindSection =
155 Ctx->getMachOSection("__LD", "__compact_unwind",
157 SectionKind::getReadOnly());
159 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
160 CompactUnwindDwarfEHFrameOnly = 0x04000000;
161 else if (T.getArch() == Triple::arm64)
162 CompactUnwindDwarfEHFrameOnly = 0x03000000;
165 // Debug Information.
166 DwarfAccelNamesSection =
167 Ctx->getMachOSection("__DWARF", "__apple_names",
169 SectionKind::getMetadata());
170 DwarfAccelObjCSection =
171 Ctx->getMachOSection("__DWARF", "__apple_objc",
173 SectionKind::getMetadata());
174 // 16 character section limit...
175 DwarfAccelNamespaceSection =
176 Ctx->getMachOSection("__DWARF", "__apple_namespac",
178 SectionKind::getMetadata());
179 DwarfAccelTypesSection =
180 Ctx->getMachOSection("__DWARF", "__apple_types",
182 SectionKind::getMetadata());
185 Ctx->getMachOSection("__DWARF", "__debug_abbrev",
187 SectionKind::getMetadata());
189 Ctx->getMachOSection("__DWARF", "__debug_info",
191 SectionKind::getMetadata());
193 Ctx->getMachOSection("__DWARF", "__debug_line",
195 SectionKind::getMetadata());
197 Ctx->getMachOSection("__DWARF", "__debug_frame",
199 SectionKind::getMetadata());
200 DwarfPubNamesSection =
201 Ctx->getMachOSection("__DWARF", "__debug_pubnames",
203 SectionKind::getMetadata());
204 DwarfPubTypesSection =
205 Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
207 SectionKind::getMetadata());
208 DwarfGnuPubNamesSection =
209 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
211 SectionKind::getMetadata());
212 DwarfGnuPubTypesSection =
213 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
215 SectionKind::getMetadata());
217 Ctx->getMachOSection("__DWARF", "__debug_str",
219 SectionKind::getMetadata());
221 Ctx->getMachOSection("__DWARF", "__debug_loc",
223 SectionKind::getMetadata());
224 DwarfARangesSection =
225 Ctx->getMachOSection("__DWARF", "__debug_aranges",
227 SectionKind::getMetadata());
229 Ctx->getMachOSection("__DWARF", "__debug_ranges",
231 SectionKind::getMetadata());
232 DwarfMacroInfoSection =
233 Ctx->getMachOSection("__DWARF", "__debug_macinfo",
235 SectionKind::getMetadata());
236 DwarfDebugInlineSection =
237 Ctx->getMachOSection("__DWARF", "__debug_inlined",
239 SectionKind::getMetadata());
241 Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
242 SectionKind::getMetadata());
244 TLSExtraDataSection = TLSTLVSection;
247 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
248 if (T.getArch() == Triple::mips ||
249 T.getArch() == Triple::mipsel)
250 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
251 else if (T.getArch() == Triple::mips64 ||
252 T.getArch() == Triple::mips64el)
253 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
255 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
257 if (T.getArch() == Triple::x86) {
258 PersonalityEncoding = (RelocM == Reloc::PIC_)
259 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
260 : dwarf::DW_EH_PE_absptr;
261 LSDAEncoding = (RelocM == Reloc::PIC_)
262 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
263 : dwarf::DW_EH_PE_absptr;
264 FDEEncoding = (RelocM == Reloc::PIC_)
265 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
266 : dwarf::DW_EH_PE_absptr;
267 TTypeEncoding = (RelocM == Reloc::PIC_)
268 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
269 : dwarf::DW_EH_PE_absptr;
270 } else if (T.getArch() == Triple::x86_64) {
271 if (RelocM == Reloc::PIC_) {
272 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
273 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
274 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
275 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
276 (CMModel == CodeModel::Small
277 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
278 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
279 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
280 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
281 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
283 PersonalityEncoding =
284 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
285 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
286 LSDAEncoding = (CMModel == CodeModel::Small)
287 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
288 FDEEncoding = dwarf::DW_EH_PE_udata4;
289 TTypeEncoding = (CMModel == CodeModel::Small)
290 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
292 } else if (T.getArch() == Triple::aarch64 ||
293 T.getArch() == Triple::aarch64_be ) {
294 // The small model guarantees static code/data size < 4GB, but not where it
295 // will be in memory. Most of these could end up >2GB away so even a signed
296 // pc-relative 32-bit address is insufficient, theoretically.
297 if (RelocM == Reloc::PIC_) {
298 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
299 dwarf::DW_EH_PE_sdata8;
300 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
301 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
302 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
303 dwarf::DW_EH_PE_sdata8;
305 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
306 LSDAEncoding = dwarf::DW_EH_PE_absptr;
307 FDEEncoding = dwarf::DW_EH_PE_udata4;
308 TTypeEncoding = dwarf::DW_EH_PE_absptr;
310 } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
311 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
312 dwarf::DW_EH_PE_udata8;
313 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
314 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
315 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
316 dwarf::DW_EH_PE_udata8;
317 } else if (T.getArch() == Triple::sparc) {
318 if (RelocM == Reloc::PIC_) {
319 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
320 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
321 dwarf::DW_EH_PE_sdata4;
322 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
323 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
324 dwarf::DW_EH_PE_sdata4;
326 LSDAEncoding = dwarf::DW_EH_PE_absptr;
327 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
328 FDEEncoding = dwarf::DW_EH_PE_udata4;
329 TTypeEncoding = dwarf::DW_EH_PE_absptr;
331 } else if (T.getArch() == Triple::sparcv9) {
332 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
333 if (RelocM == Reloc::PIC_) {
334 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
335 dwarf::DW_EH_PE_sdata4;
336 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
337 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
338 dwarf::DW_EH_PE_sdata4;
340 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
341 FDEEncoding = dwarf::DW_EH_PE_udata4;
342 TTypeEncoding = dwarf::DW_EH_PE_absptr;
344 } else if (T.getArch() == Triple::systemz) {
345 // All currently-defined code models guarantee that 4-byte PC-relative
346 // values will be in range.
347 if (RelocM == Reloc::PIC_) {
348 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
349 dwarf::DW_EH_PE_sdata4;
350 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
351 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
352 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
353 dwarf::DW_EH_PE_sdata4;
355 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
356 LSDAEncoding = dwarf::DW_EH_PE_absptr;
357 FDEEncoding = dwarf::DW_EH_PE_absptr;
358 TTypeEncoding = dwarf::DW_EH_PE_absptr;
362 // Solaris requires different flags for .eh_frame to seemingly every other
364 EHSectionType = ELF::SHT_PROGBITS;
365 EHSectionFlags = ELF::SHF_ALLOC;
366 if (T.getOS() == Triple::Solaris) {
367 if (T.getArch() == Triple::x86_64)
368 EHSectionType = ELF::SHT_X86_64_UNWIND;
370 EHSectionFlags |= ELF::SHF_WRITE;
376 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
377 ELF::SHF_WRITE | ELF::SHF_ALLOC,
378 SectionKind::getBSS());
381 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
384 SectionKind::getText());
387 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
388 ELF::SHF_WRITE |ELF::SHF_ALLOC,
389 SectionKind::getDataRel());
392 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
394 SectionKind::getReadOnly());
397 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
398 ELF::SHF_ALLOC | ELF::SHF_TLS |
400 SectionKind::getThreadData());
403 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
404 ELF::SHF_ALLOC | ELF::SHF_TLS |
406 SectionKind::getThreadBSS());
409 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
410 ELF::SHF_ALLOC |ELF::SHF_WRITE,
411 SectionKind::getDataRel());
413 DataRelLocalSection =
414 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
415 ELF::SHF_ALLOC |ELF::SHF_WRITE,
416 SectionKind::getDataRelLocal());
419 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
420 ELF::SHF_ALLOC |ELF::SHF_WRITE,
421 SectionKind::getReadOnlyWithRel());
423 DataRelROLocalSection =
424 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
425 ELF::SHF_ALLOC |ELF::SHF_WRITE,
426 SectionKind::getReadOnlyWithRelLocal());
428 MergeableConst4Section =
429 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
430 ELF::SHF_ALLOC |ELF::SHF_MERGE,
431 SectionKind::getMergeableConst4());
433 MergeableConst8Section =
434 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
435 ELF::SHF_ALLOC |ELF::SHF_MERGE,
436 SectionKind::getMergeableConst8());
438 MergeableConst16Section =
439 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
440 ELF::SHF_ALLOC |ELF::SHF_MERGE,
441 SectionKind::getMergeableConst16());
444 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC |ELF::SHF_WRITE,
446 SectionKind::getDataRel());
449 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
450 ELF::SHF_ALLOC |ELF::SHF_WRITE,
451 SectionKind::getDataRel());
453 // Exception Handling Sections.
455 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
456 // it contains relocatable pointers. In PIC mode, this is probably a big
457 // runtime hit for C++ apps. Either the contents of the LSDA need to be
458 // adjusted or this should be a data section.
460 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
462 SectionKind::getReadOnly());
464 COFFDebugSymbolsSection = nullptr;
466 // Debug Info Sections.
468 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
469 SectionKind::getMetadata());
471 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
472 SectionKind::getMetadata());
474 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
475 SectionKind::getMetadata());
477 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
478 SectionKind::getMetadata());
479 DwarfPubNamesSection =
480 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
481 SectionKind::getMetadata());
482 DwarfPubTypesSection =
483 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
484 SectionKind::getMetadata());
485 DwarfGnuPubNamesSection =
486 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
487 SectionKind::getMetadata());
488 DwarfGnuPubTypesSection =
489 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
490 SectionKind::getMetadata());
492 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
493 ELF::SHF_MERGE | ELF::SHF_STRINGS,
494 SectionKind::getMergeable1ByteCString());
496 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
497 SectionKind::getMetadata());
498 DwarfARangesSection =
499 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
500 SectionKind::getMetadata());
502 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
503 SectionKind::getMetadata());
504 DwarfMacroInfoSection =
505 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
506 SectionKind::getMetadata());
508 // DWARF5 Experimental Debug Info
510 // Accelerator Tables
511 DwarfAccelNamesSection =
512 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
513 SectionKind::getMetadata());
514 DwarfAccelObjCSection =
515 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
516 SectionKind::getMetadata());
517 DwarfAccelNamespaceSection =
518 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
519 SectionKind::getMetadata());
520 DwarfAccelTypesSection =
521 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
522 SectionKind::getMetadata());
525 DwarfInfoDWOSection =
526 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
527 SectionKind::getMetadata());
528 DwarfAbbrevDWOSection =
529 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
530 SectionKind::getMetadata());
532 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
533 ELF::SHF_MERGE | ELF::SHF_STRINGS,
534 SectionKind::getMergeable1ByteCString());
535 DwarfLineDWOSection =
536 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
537 SectionKind::getMetadata());
539 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
540 SectionKind::getMetadata());
541 DwarfStrOffDWOSection =
542 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
543 SectionKind::getMetadata());
545 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
546 SectionKind::getMetadata());
550 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
551 // The object file format cannot represent common symbols with explicit
553 CommDirectiveSupportsAlignment = false;
557 Ctx->getCOFFSection(".bss",
558 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
559 COFF::IMAGE_SCN_MEM_READ |
560 COFF::IMAGE_SCN_MEM_WRITE,
561 SectionKind::getBSS());
563 Ctx->getCOFFSection(".text",
564 COFF::IMAGE_SCN_CNT_CODE |
565 COFF::IMAGE_SCN_MEM_EXECUTE |
566 COFF::IMAGE_SCN_MEM_READ,
567 SectionKind::getText());
569 Ctx->getCOFFSection(".data",
570 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
571 COFF::IMAGE_SCN_MEM_READ |
572 COFF::IMAGE_SCN_MEM_WRITE,
573 SectionKind::getDataRel());
575 Ctx->getCOFFSection(".rdata",
576 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
577 COFF::IMAGE_SCN_MEM_READ,
578 SectionKind::getReadOnly());
579 if (T.isKnownWindowsMSVCEnvironment()) {
581 Ctx->getCOFFSection(".CRT$XCU",
582 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
583 COFF::IMAGE_SCN_MEM_READ,
584 SectionKind::getReadOnly());
587 Ctx->getCOFFSection(".ctors",
588 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
589 COFF::IMAGE_SCN_MEM_READ |
590 COFF::IMAGE_SCN_MEM_WRITE,
591 SectionKind::getDataRel());
595 if (T.isKnownWindowsMSVCEnvironment()) {
597 Ctx->getCOFFSection(".CRT$XTX",
598 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
599 COFF::IMAGE_SCN_MEM_READ,
600 SectionKind::getReadOnly());
603 Ctx->getCOFFSection(".dtors",
604 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
605 COFF::IMAGE_SCN_MEM_READ |
606 COFF::IMAGE_SCN_MEM_WRITE,
607 SectionKind::getDataRel());
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.
615 Ctx->getCOFFSection(".gcc_except_table",
616 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
617 COFF::IMAGE_SCN_MEM_READ,
618 SectionKind::getReadOnly());
621 COFFDebugSymbolsSection =
622 Ctx->getCOFFSection(".debug$S",
623 COFF::IMAGE_SCN_MEM_DISCARDABLE |
624 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
625 COFF::IMAGE_SCN_MEM_READ,
626 SectionKind::getMetadata());
629 Ctx->getCOFFSection(".debug_abbrev",
630 COFF::IMAGE_SCN_MEM_DISCARDABLE |
631 COFF::IMAGE_SCN_MEM_READ,
632 SectionKind::getMetadata());
634 Ctx->getCOFFSection(".debug_info",
635 COFF::IMAGE_SCN_MEM_DISCARDABLE |
636 COFF::IMAGE_SCN_MEM_READ,
637 SectionKind::getMetadata());
639 Ctx->getCOFFSection(".debug_line",
640 COFF::IMAGE_SCN_MEM_DISCARDABLE |
641 COFF::IMAGE_SCN_MEM_READ,
642 SectionKind::getMetadata());
644 Ctx->getCOFFSection(".debug_frame",
645 COFF::IMAGE_SCN_MEM_DISCARDABLE |
646 COFF::IMAGE_SCN_MEM_READ,
647 SectionKind::getMetadata());
648 DwarfPubNamesSection =
649 Ctx->getCOFFSection(".debug_pubnames",
650 COFF::IMAGE_SCN_MEM_DISCARDABLE |
651 COFF::IMAGE_SCN_MEM_READ,
652 SectionKind::getMetadata());
653 DwarfPubTypesSection =
654 Ctx->getCOFFSection(".debug_pubtypes",
655 COFF::IMAGE_SCN_MEM_DISCARDABLE |
656 COFF::IMAGE_SCN_MEM_READ,
657 SectionKind::getMetadata());
658 DwarfGnuPubNamesSection =
659 Ctx->getCOFFSection(".debug_gnu_pubnames",
660 COFF::IMAGE_SCN_MEM_DISCARDABLE |
661 COFF::IMAGE_SCN_MEM_READ,
662 SectionKind::getMetadata());
663 DwarfGnuPubTypesSection =
664 Ctx->getCOFFSection(".debug_gnu_pubtypes",
665 COFF::IMAGE_SCN_MEM_DISCARDABLE |
666 COFF::IMAGE_SCN_MEM_READ,
667 SectionKind::getMetadata());
669 Ctx->getCOFFSection(".debug_str",
670 COFF::IMAGE_SCN_MEM_DISCARDABLE |
671 COFF::IMAGE_SCN_MEM_READ,
672 SectionKind::getMetadata());
674 Ctx->getCOFFSection(".debug_loc",
675 COFF::IMAGE_SCN_MEM_DISCARDABLE |
676 COFF::IMAGE_SCN_MEM_READ,
677 SectionKind::getMetadata());
678 DwarfARangesSection =
679 Ctx->getCOFFSection(".debug_aranges",
680 COFF::IMAGE_SCN_MEM_DISCARDABLE |
681 COFF::IMAGE_SCN_MEM_READ,
682 SectionKind::getMetadata());
684 Ctx->getCOFFSection(".debug_ranges",
685 COFF::IMAGE_SCN_MEM_DISCARDABLE |
686 COFF::IMAGE_SCN_MEM_READ,
687 SectionKind::getMetadata());
688 DwarfMacroInfoSection =
689 Ctx->getCOFFSection(".debug_macinfo",
690 COFF::IMAGE_SCN_MEM_DISCARDABLE |
691 COFF::IMAGE_SCN_MEM_READ,
692 SectionKind::getMetadata());
693 DwarfInfoDWOSection =
694 Ctx->getCOFFSection(".debug_info.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
695 COFF::IMAGE_SCN_MEM_READ,
696 SectionKind::getMetadata());
697 DwarfAbbrevDWOSection =
698 Ctx->getCOFFSection(".debug_abbrev.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
699 COFF::IMAGE_SCN_MEM_READ,
700 SectionKind::getMetadata());
702 Ctx->getCOFFSection(".debug_str.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
703 COFF::IMAGE_SCN_MEM_READ,
704 SectionKind::getMetadata());
705 DwarfLineDWOSection =
706 Ctx->getCOFFSection(".debug_line.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
707 COFF::IMAGE_SCN_MEM_READ,
708 SectionKind::getMetadata());
710 Ctx->getCOFFSection(".debug_loc.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
711 COFF::IMAGE_SCN_MEM_READ,
712 SectionKind::getMetadata());
713 DwarfStrOffDWOSection =
714 Ctx->getCOFFSection(".debug_str_offsets.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE |
715 COFF::IMAGE_SCN_MEM_READ,
716 SectionKind::getMetadata());
717 DwarfAddrSection = Ctx->getCOFFSection(
718 ".debug_addr", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ,
719 SectionKind::getMetadata());
722 Ctx->getCOFFSection(".drectve",
723 COFF::IMAGE_SCN_LNK_INFO,
724 SectionKind::getMetadata());
727 Ctx->getCOFFSection(".pdata",
728 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
729 COFF::IMAGE_SCN_MEM_READ,
730 SectionKind::getDataRel());
733 Ctx->getCOFFSection(".xdata",
734 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
735 COFF::IMAGE_SCN_MEM_READ,
736 SectionKind::getDataRel());
738 Ctx->getCOFFSection(".tls$",
739 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
740 COFF::IMAGE_SCN_MEM_READ |
741 COFF::IMAGE_SCN_MEM_WRITE,
742 SectionKind::getDataRel());
745 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
753 CommDirectiveSupportsAlignment = true;
754 SupportsWeakOmittedEHFrame = true;
755 IsFunctionEHFrameSymbolPrivate = true;
756 SupportsCompactUnwindWithoutEHFrame = false;
758 PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
759 TTypeEncoding = dwarf::DW_EH_PE_absptr;
761 CompactUnwindDwarfEHFrameOnly = 0;
763 EHFrameSection = nullptr; // Created on demand.
764 CompactUnwindSection = nullptr; // Used only by selected targets.
765 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
766 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
767 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
768 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
771 Triple::ArchType Arch = T.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::arm64 ||
777 Arch == Triple::ppc || Arch == Triple::ppc64 ||
778 Arch == Triple::UnknownArch) &&
779 (T.isOSDarwin() || T.isOSBinFormatMachO())) {
781 InitMachOMCObjectFileInfo(T);
782 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
783 T.getObjectFormat() != Triple::ELF && T.isOSWindows()) {
785 InitCOFFMCObjectFileInfo(T);
788 InitELFMCObjectFileInfo(T);
792 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
793 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
794 SectionKind::getMetadata(), 0, utostr(Hash));
798 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
799 return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS,
800 ELF::SHF_GROUP, SectionKind::getMetadata(), 0,
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,
817 SectionKind::getDataRel());
820 Ctx->getCOFFSection(".eh_frame",
821 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
822 COFF::IMAGE_SCN_MEM_READ |
823 COFF::IMAGE_SCN_MEM_WRITE,
824 SectionKind::getDataRel());