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"
21 static bool useCompactUnwind(const Triple &T) {
26 // aarch64 always has it.
27 if (T.getArch() == Triple::aarch64)
30 // Use it on newer version of OS X.
31 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
34 // And the iOS simulator.
36 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
42 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
44 SupportsWeakOmittedEHFrame = false;
46 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
47 SupportsCompactUnwindWithoutEHFrame = true;
49 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
50 | dwarf::DW_EH_PE_sdata4;
51 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
52 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
53 dwarf::DW_EH_PE_sdata4;
55 // .comm doesn't support alignment before Leopard.
56 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
57 CommDirectiveSupportsAlignment = false;
60 = Ctx->getMachOSection("__TEXT", "__text",
61 MachO::S_ATTR_PURE_INSTRUCTIONS,
62 SectionKind::getText());
64 = Ctx->getMachOSection("__DATA", "__data", 0,
65 SectionKind::getDataRel());
67 // BSSSection might not be expected initialized on msvc.
70 TLSDataSection // .tdata
71 = Ctx->getMachOSection("__DATA", "__thread_data",
72 MachO::S_THREAD_LOCAL_REGULAR,
73 SectionKind::getDataRel());
74 TLSBSSSection // .tbss
75 = Ctx->getMachOSection("__DATA", "__thread_bss",
76 MachO::S_THREAD_LOCAL_ZEROFILL,
77 SectionKind::getThreadBSS());
79 // TODO: Verify datarel below.
81 = Ctx->getMachOSection("__DATA", "__thread_vars",
82 MachO::S_THREAD_LOCAL_VARIABLES,
83 SectionKind::getDataRel());
86 = Ctx->getMachOSection("__DATA", "__thread_init",
87 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
88 SectionKind::getDataRel());
90 CStringSection // .cstring
91 = Ctx->getMachOSection("__TEXT", "__cstring",
92 MachO::S_CSTRING_LITERALS,
93 SectionKind::getMergeable1ByteCString());
95 = Ctx->getMachOSection("__TEXT","__ustring", 0,
96 SectionKind::getMergeable2ByteCString());
97 FourByteConstantSection // .literal4
98 = Ctx->getMachOSection("__TEXT", "__literal4",
99 MachO::S_4BYTE_LITERALS,
100 SectionKind::getMergeableConst4());
101 EightByteConstantSection // .literal8
102 = Ctx->getMachOSection("__TEXT", "__literal8",
103 MachO::S_8BYTE_LITERALS,
104 SectionKind::getMergeableConst8());
106 SixteenByteConstantSection // .literal16
107 = Ctx->getMachOSection("__TEXT", "__literal16",
108 MachO::S_16BYTE_LITERALS,
109 SectionKind::getMergeableConst16());
111 ReadOnlySection // .const
112 = Ctx->getMachOSection("__TEXT", "__const", 0,
113 SectionKind::getReadOnly());
116 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
118 MachO::S_ATTR_PURE_INSTRUCTIONS,
119 SectionKind::getText());
121 = Ctx->getMachOSection("__TEXT", "__const_coal",
123 SectionKind::getReadOnly());
124 ConstDataSection // .const_data
125 = Ctx->getMachOSection("__DATA", "__const", 0,
126 SectionKind::getReadOnlyWithRel());
128 = Ctx->getMachOSection("__DATA","__datacoal_nt",
130 SectionKind::getDataRel());
132 = Ctx->getMachOSection("__DATA","__common",
134 SectionKind::getBSS());
136 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
137 SectionKind::getBSS());
140 LazySymbolPointerSection
141 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
142 MachO::S_LAZY_SYMBOL_POINTERS,
143 SectionKind::getMetadata());
144 NonLazySymbolPointerSection
145 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
146 MachO::S_NON_LAZY_SYMBOL_POINTERS,
147 SectionKind::getMetadata());
149 if (RelocM == Reloc::Static) {
151 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
152 SectionKind::getDataRel());
154 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
155 SectionKind::getDataRel());
158 = Ctx->getMachOSection("__DATA", "__mod_init_func",
159 MachO::S_MOD_INIT_FUNC_POINTERS,
160 SectionKind::getDataRel());
162 = Ctx->getMachOSection("__DATA", "__mod_term_func",
163 MachO::S_MOD_TERM_FUNC_POINTERS,
164 SectionKind::getDataRel());
167 // Exception Handling.
168 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
169 SectionKind::getReadOnlyWithRel());
171 COFFDebugSymbolsSection = nullptr;
173 if (useCompactUnwind(T)) {
174 CompactUnwindSection =
175 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
176 SectionKind::getReadOnly());
178 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
179 CompactUnwindDwarfEHFrameOnly = 0x04000000;
180 else if (T.getArch() == Triple::aarch64)
181 CompactUnwindDwarfEHFrameOnly = 0x03000000;
184 // Debug Information.
185 DwarfAccelNamesSection =
186 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
187 SectionKind::getMetadata(), "names_begin");
188 DwarfAccelObjCSection =
189 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
190 SectionKind::getMetadata(), "objc_begin");
191 // 16 character section limit...
192 DwarfAccelNamespaceSection =
193 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
194 SectionKind::getMetadata(), "namespac_begin");
195 DwarfAccelTypesSection =
196 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
197 SectionKind::getMetadata(), "types_begin");
200 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
201 SectionKind::getMetadata(), "section_abbrev");
203 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
204 SectionKind::getMetadata(), "section_info");
206 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
207 SectionKind::getMetadata(), "section_line");
209 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
210 SectionKind::getMetadata());
211 DwarfPubNamesSection =
212 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
213 SectionKind::getMetadata());
214 DwarfPubTypesSection =
215 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
216 SectionKind::getMetadata());
217 DwarfGnuPubNamesSection =
218 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
219 SectionKind::getMetadata());
220 DwarfGnuPubTypesSection =
221 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
222 SectionKind::getMetadata());
224 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
225 SectionKind::getMetadata(), "info_string");
227 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
228 SectionKind::getMetadata(), "section_debug_loc");
229 DwarfARangesSection =
230 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
231 SectionKind::getMetadata());
233 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
234 SectionKind::getMetadata(), "debug_range");
235 DwarfDebugInlineSection =
236 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
237 SectionKind::getMetadata());
238 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
239 0, SectionKind::getMetadata());
241 TLSExtraDataSection = TLSTLVSection;
244 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
245 switch (T.getArch()) {
248 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
251 case Triple::mips64el:
252 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
255 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
256 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
257 : dwarf::DW_EH_PE_sdata4);
261 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
265 switch (T.getArch()) {
269 case Triple::thumbeb:
270 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
272 // Fallthrough if not using EHABI
275 PersonalityEncoding = (RelocM == Reloc::PIC_)
276 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
277 : dwarf::DW_EH_PE_absptr;
278 LSDAEncoding = (RelocM == Reloc::PIC_)
279 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
280 : dwarf::DW_EH_PE_absptr;
281 TTypeEncoding = (RelocM == Reloc::PIC_)
282 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
283 : dwarf::DW_EH_PE_absptr;
286 if (RelocM == Reloc::PIC_) {
287 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
288 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
289 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
290 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
291 (CMModel == CodeModel::Small
292 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
293 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
294 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
295 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
297 PersonalityEncoding =
298 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
299 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
300 LSDAEncoding = (CMModel == CodeModel::Small)
301 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
302 TTypeEncoding = (CMModel == CodeModel::Small)
303 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
306 case Triple::aarch64:
307 case Triple::aarch64_be:
308 // The small model guarantees static code/data size < 4GB, but not where it
309 // will be in memory. Most of these could end up >2GB away so even a signed
310 // pc-relative 32-bit address is insufficient, theoretically.
311 if (RelocM == Reloc::PIC_) {
312 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
313 dwarf::DW_EH_PE_sdata8;
314 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
315 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
316 dwarf::DW_EH_PE_sdata8;
318 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
319 LSDAEncoding = dwarf::DW_EH_PE_absptr;
320 TTypeEncoding = dwarf::DW_EH_PE_absptr;
326 case Triple::mips64el:
327 // MIPS uses indirect pointer to refer personality functions, so that the
328 // eh_frame section can be read-only. DW.ref.personality will be generated
330 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
333 case Triple::ppc64le:
334 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
335 dwarf::DW_EH_PE_udata8;
336 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
337 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
338 dwarf::DW_EH_PE_udata8;
340 case Triple::sparcel:
342 if (RelocM == Reloc::PIC_) {
343 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
344 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
345 dwarf::DW_EH_PE_sdata4;
346 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
347 dwarf::DW_EH_PE_sdata4;
349 LSDAEncoding = dwarf::DW_EH_PE_absptr;
350 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
351 TTypeEncoding = dwarf::DW_EH_PE_absptr;
354 case Triple::sparcv9:
355 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
356 if (RelocM == Reloc::PIC_) {
357 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
358 dwarf::DW_EH_PE_sdata4;
359 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
360 dwarf::DW_EH_PE_sdata4;
362 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
363 TTypeEncoding = dwarf::DW_EH_PE_absptr;
366 case Triple::systemz:
367 // All currently-defined code models guarantee that 4-byte PC-relative
368 // values will be in range.
369 if (RelocM == Reloc::PIC_) {
370 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
371 dwarf::DW_EH_PE_sdata4;
372 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
373 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
374 dwarf::DW_EH_PE_sdata4;
376 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
377 LSDAEncoding = dwarf::DW_EH_PE_absptr;
378 TTypeEncoding = dwarf::DW_EH_PE_absptr;
385 // Solaris requires different flags for .eh_frame to seemingly every other
387 EHSectionType = ELF::SHT_PROGBITS;
388 EHSectionFlags = ELF::SHF_ALLOC;
389 if (T.isOSSolaris()) {
390 if (T.getArch() == Triple::x86_64)
391 EHSectionType = ELF::SHT_X86_64_UNWIND;
393 EHSectionFlags |= ELF::SHF_WRITE;
398 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
399 ELF::SHF_WRITE | ELF::SHF_ALLOC);
401 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
402 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
404 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
405 ELF::SHF_WRITE | ELF::SHF_ALLOC);
408 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
411 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
412 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
414 TLSBSSSection = Ctx->getELFSection(
415 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
417 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
418 ELF::SHF_ALLOC | ELF::SHF_WRITE);
420 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
421 ELF::SHF_ALLOC | ELF::SHF_WRITE);
423 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
424 ELF::SHF_ALLOC | ELF::SHF_WRITE);
426 DataRelROLocalSection = Ctx->getELFSection(
427 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
429 MergeableConst4Section =
430 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
431 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
433 MergeableConst8Section =
434 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
435 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
437 MergeableConst16Section =
438 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
439 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
441 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
442 ELF::SHF_ALLOC | ELF::SHF_WRITE);
444 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC | ELF::SHF_WRITE);
447 // Exception Handling Sections.
449 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
450 // it contains relocatable pointers. In PIC mode, this is probably a big
451 // runtime hit for C++ apps. Either the contents of the LSDA need to be
452 // adjusted or this should be a data section.
453 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
456 COFFDebugSymbolsSection = nullptr;
458 // Debug Info Sections.
459 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
462 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
463 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
464 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
465 DwarfPubNamesSection =
466 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
467 DwarfPubTypesSection =
468 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
469 DwarfGnuPubNamesSection =
470 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
471 DwarfGnuPubTypesSection =
472 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
474 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
475 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
476 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
477 DwarfARangesSection =
478 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
480 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
482 // DWARF5 Experimental Debug Info
484 // Accelerator Tables
485 DwarfAccelNamesSection =
486 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
487 DwarfAccelObjCSection =
488 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
489 DwarfAccelNamespaceSection = Ctx->getELFSection(
490 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
491 DwarfAccelTypesSection =
492 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
495 DwarfInfoDWOSection =
496 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
497 DwarfTypesDWOSection =
498 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
499 DwarfAbbrevDWOSection =
500 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
502 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
503 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
504 DwarfLineDWOSection =
505 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
507 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
508 DwarfStrOffDWOSection =
509 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
511 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
514 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
517 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
518 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
520 CommDirectiveSupportsAlignment = true;
523 BSSSection = Ctx->getCOFFSection(
524 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
525 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
526 SectionKind::getBSS());
527 TextSection = Ctx->getCOFFSection(
529 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
530 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
531 COFF::IMAGE_SCN_MEM_READ,
532 SectionKind::getText());
533 DataSection = Ctx->getCOFFSection(
534 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
535 COFF::IMAGE_SCN_MEM_WRITE,
536 SectionKind::getDataRel());
537 ReadOnlySection = Ctx->getCOFFSection(
538 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
539 SectionKind::getReadOnly());
541 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
543 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
544 COFF::IMAGE_SCN_MEM_READ,
545 SectionKind::getReadOnly());
547 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
548 COFF::IMAGE_SCN_MEM_READ,
549 SectionKind::getReadOnly());
551 StaticCtorSection = Ctx->getCOFFSection(
552 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
553 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
554 SectionKind::getDataRel());
555 StaticDtorSection = Ctx->getCOFFSection(
556 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
557 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
558 SectionKind::getDataRel());
561 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
562 // though it contains relocatable pointers. In PIC mode, this is probably a
563 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
564 // adjusted or this should be a data section.
565 assert(T.isOSWindows() && "Windows is the only supported COFF target");
566 if (T.getArch() == Triple::x86_64) {
567 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
570 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
571 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
572 COFF::IMAGE_SCN_MEM_READ,
573 SectionKind::getReadOnly());
577 COFFDebugSymbolsSection =
578 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
579 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
580 COFF::IMAGE_SCN_MEM_READ,
581 SectionKind::getMetadata());
583 DwarfAbbrevSection = Ctx->getCOFFSection(
585 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
586 COFF::IMAGE_SCN_MEM_READ,
587 SectionKind::getMetadata(), "section_abbrev");
588 DwarfInfoSection = Ctx->getCOFFSection(
590 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
591 COFF::IMAGE_SCN_MEM_READ,
592 SectionKind::getMetadata(), "section_info");
593 DwarfLineSection = Ctx->getCOFFSection(
595 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
596 COFF::IMAGE_SCN_MEM_READ,
597 SectionKind::getMetadata(), "section_line");
599 DwarfFrameSection = Ctx->getCOFFSection(
601 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
602 COFF::IMAGE_SCN_MEM_READ,
603 SectionKind::getMetadata());
604 DwarfPubNamesSection = Ctx->getCOFFSection(
606 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
607 COFF::IMAGE_SCN_MEM_READ,
608 SectionKind::getMetadata());
609 DwarfPubTypesSection = Ctx->getCOFFSection(
611 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
612 COFF::IMAGE_SCN_MEM_READ,
613 SectionKind::getMetadata());
614 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
615 ".debug_gnu_pubnames",
616 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
617 COFF::IMAGE_SCN_MEM_READ,
618 SectionKind::getMetadata());
619 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
620 ".debug_gnu_pubtypes",
621 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
622 COFF::IMAGE_SCN_MEM_READ,
623 SectionKind::getMetadata());
624 DwarfStrSection = Ctx->getCOFFSection(
626 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
627 COFF::IMAGE_SCN_MEM_READ,
628 SectionKind::getMetadata(), "info_string");
629 DwarfLocSection = Ctx->getCOFFSection(
631 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
632 COFF::IMAGE_SCN_MEM_READ,
633 SectionKind::getMetadata(), "section_debug_loc");
634 DwarfARangesSection = Ctx->getCOFFSection(
636 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
637 COFF::IMAGE_SCN_MEM_READ,
638 SectionKind::getMetadata());
639 DwarfRangesSection = Ctx->getCOFFSection(
641 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
642 COFF::IMAGE_SCN_MEM_READ,
643 SectionKind::getMetadata(), "debug_range");
644 DwarfInfoDWOSection = Ctx->getCOFFSection(
646 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
647 COFF::IMAGE_SCN_MEM_READ,
648 SectionKind::getMetadata(), "section_info_dwo");
649 DwarfTypesDWOSection = Ctx->getCOFFSection(
651 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
652 COFF::IMAGE_SCN_MEM_READ,
653 SectionKind::getMetadata(), "section_types_dwo");
654 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
656 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
657 COFF::IMAGE_SCN_MEM_READ,
658 SectionKind::getMetadata(), "section_abbrev_dwo");
659 DwarfStrDWOSection = Ctx->getCOFFSection(
661 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
662 COFF::IMAGE_SCN_MEM_READ,
663 SectionKind::getMetadata(), "skel_string");
664 DwarfLineDWOSection = Ctx->getCOFFSection(
666 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
667 COFF::IMAGE_SCN_MEM_READ,
668 SectionKind::getMetadata());
669 DwarfLocDWOSection = Ctx->getCOFFSection(
671 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
672 COFF::IMAGE_SCN_MEM_READ,
673 SectionKind::getMetadata(), "skel_loc");
674 DwarfStrOffDWOSection = Ctx->getCOFFSection(
675 ".debug_str_offsets.dwo",
676 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
677 COFF::IMAGE_SCN_MEM_READ,
678 SectionKind::getMetadata());
679 DwarfAddrSection = Ctx->getCOFFSection(
681 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
682 COFF::IMAGE_SCN_MEM_READ,
683 SectionKind::getMetadata(), "addr_sec");
684 DwarfAccelNamesSection = Ctx->getCOFFSection(
686 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
687 COFF::IMAGE_SCN_MEM_READ,
688 SectionKind::getMetadata(), "names_begin");
689 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
691 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
692 COFF::IMAGE_SCN_MEM_READ,
693 SectionKind::getMetadata(), "namespac_begin");
694 DwarfAccelTypesSection = Ctx->getCOFFSection(
696 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
697 COFF::IMAGE_SCN_MEM_READ,
698 SectionKind::getMetadata(), "types_begin");
699 DwarfAccelObjCSection = Ctx->getCOFFSection(
701 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
702 COFF::IMAGE_SCN_MEM_READ,
703 SectionKind::getMetadata(), "objc_begin");
705 DrectveSection = Ctx->getCOFFSection(
706 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
707 SectionKind::getMetadata());
709 PDataSection = Ctx->getCOFFSection(
710 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
711 SectionKind::getDataRel());
713 XDataSection = Ctx->getCOFFSection(
714 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getDataRel());
717 TLSDataSection = Ctx->getCOFFSection(
718 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
719 COFF::IMAGE_SCN_MEM_WRITE,
720 SectionKind::getDataRel());
723 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
731 CommDirectiveSupportsAlignment = true;
732 SupportsWeakOmittedEHFrame = true;
733 SupportsCompactUnwindWithoutEHFrame = false;
735 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
736 dwarf::DW_EH_PE_absptr;
738 CompactUnwindDwarfEHFrameOnly = 0;
740 EHFrameSection = nullptr; // Created on demand.
741 CompactUnwindSection = nullptr; // Used only by selected targets.
742 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
743 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
744 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
745 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
749 Triple::ArchType Arch = TT.getArch();
750 // FIXME: Checking for Arch here to filter out bogus triples such as
751 // cellspu-apple-darwin. Perhaps we should fix in Triple?
752 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
753 Arch == Triple::arm || Arch == Triple::thumb ||
754 Arch == Triple::aarch64 ||
755 Arch == Triple::ppc || Arch == Triple::ppc64 ||
756 Arch == Triple::UnknownArch) &&
757 TT.isOSBinFormatMachO()) {
759 InitMachOMCObjectFileInfo(TT);
760 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
761 Arch == Triple::arm || Arch == Triple::thumb) &&
762 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
764 InitCOFFMCObjectFileInfo(TT);
767 InitELFMCObjectFileInfo(TT);
771 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
772 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
776 void MCObjectFileInfo::InitEHFrameSection() {
779 Ctx->getMachOSection("__TEXT", "__eh_frame",
781 MachO::S_ATTR_NO_TOC |
782 MachO::S_ATTR_STRIP_STATIC_SYMS |
783 MachO::S_ATTR_LIVE_SUPPORT,
784 SectionKind::getReadOnly());
785 else if (Env == IsELF)
787 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
790 Ctx->getCOFFSection(".eh_frame",
791 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
792 COFF::IMAGE_SCN_MEM_READ |
793 COFF::IMAGE_SCN_MEM_WRITE,
794 SectionKind::getDataRel());