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 and types, so
328 // that the eh_frame section can be read-only. DW.ref.personality will be
329 // generated for relocation.
330 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
331 TTypeEncoding = SelectMipsTTypeEncoding();
332 // We don't support PC-relative LSDA references in GAS so we use the default
333 // DW_EH_PE_absptr for those.
336 case Triple::ppc64le:
337 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
338 dwarf::DW_EH_PE_udata8;
339 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
340 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
341 dwarf::DW_EH_PE_udata8;
343 case Triple::sparcel:
345 if (RelocM == Reloc::PIC_) {
346 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
347 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
348 dwarf::DW_EH_PE_sdata4;
349 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
350 dwarf::DW_EH_PE_sdata4;
352 LSDAEncoding = dwarf::DW_EH_PE_absptr;
353 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
354 TTypeEncoding = dwarf::DW_EH_PE_absptr;
357 case Triple::sparcv9:
358 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
359 if (RelocM == Reloc::PIC_) {
360 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
361 dwarf::DW_EH_PE_sdata4;
362 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
363 dwarf::DW_EH_PE_sdata4;
365 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
366 TTypeEncoding = dwarf::DW_EH_PE_absptr;
369 case Triple::systemz:
370 // All currently-defined code models guarantee that 4-byte PC-relative
371 // values will be in range.
372 if (RelocM == Reloc::PIC_) {
373 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
374 dwarf::DW_EH_PE_sdata4;
375 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
376 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
377 dwarf::DW_EH_PE_sdata4;
379 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
380 LSDAEncoding = dwarf::DW_EH_PE_absptr;
381 TTypeEncoding = dwarf::DW_EH_PE_absptr;
388 // Solaris requires different flags for .eh_frame to seemingly every other
390 EHSectionType = ELF::SHT_PROGBITS;
391 EHSectionFlags = ELF::SHF_ALLOC;
392 if (T.isOSSolaris()) {
393 if (T.getArch() == Triple::x86_64)
394 EHSectionType = ELF::SHT_X86_64_UNWIND;
396 EHSectionFlags |= ELF::SHF_WRITE;
401 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
402 ELF::SHF_WRITE | ELF::SHF_ALLOC);
404 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
405 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
407 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
408 ELF::SHF_WRITE | ELF::SHF_ALLOC);
411 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
414 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
415 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
417 TLSBSSSection = Ctx->getELFSection(
418 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
420 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
421 ELF::SHF_ALLOC | ELF::SHF_WRITE);
423 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
424 ELF::SHF_ALLOC | ELF::SHF_WRITE);
426 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
427 ELF::SHF_ALLOC | ELF::SHF_WRITE);
429 DataRelROLocalSection = Ctx->getELFSection(
430 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
432 MergeableConst4Section =
433 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
434 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
436 MergeableConst8Section =
437 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
438 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
440 MergeableConst16Section =
441 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
442 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
444 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
445 ELF::SHF_ALLOC | ELF::SHF_WRITE);
447 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
448 ELF::SHF_ALLOC | ELF::SHF_WRITE);
450 // Exception Handling Sections.
452 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
453 // it contains relocatable pointers. In PIC mode, this is probably a big
454 // runtime hit for C++ apps. Either the contents of the LSDA need to be
455 // adjusted or this should be a data section.
456 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
459 COFFDebugSymbolsSection = nullptr;
461 // Debug Info Sections.
462 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
465 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
466 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
467 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
468 DwarfPubNamesSection =
469 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
470 DwarfPubTypesSection =
471 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
472 DwarfGnuPubNamesSection =
473 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
474 DwarfGnuPubTypesSection =
475 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
477 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
478 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
479 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
480 DwarfARangesSection =
481 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
483 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
485 // DWARF5 Experimental Debug Info
487 // Accelerator Tables
488 DwarfAccelNamesSection =
489 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
490 DwarfAccelObjCSection =
491 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
492 DwarfAccelNamespaceSection = Ctx->getELFSection(
493 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
494 DwarfAccelTypesSection =
495 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
498 DwarfInfoDWOSection =
499 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
500 DwarfTypesDWOSection =
501 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
502 DwarfAbbrevDWOSection =
503 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
505 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
506 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
507 DwarfLineDWOSection =
508 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
510 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
511 DwarfStrOffDWOSection =
512 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
514 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
517 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
520 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
521 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
523 CommDirectiveSupportsAlignment = true;
526 BSSSection = Ctx->getCOFFSection(
527 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
528 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
529 SectionKind::getBSS());
530 TextSection = Ctx->getCOFFSection(
532 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
533 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
534 COFF::IMAGE_SCN_MEM_READ,
535 SectionKind::getText());
536 DataSection = Ctx->getCOFFSection(
537 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
538 COFF::IMAGE_SCN_MEM_WRITE,
539 SectionKind::getDataRel());
540 ReadOnlySection = Ctx->getCOFFSection(
541 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
542 SectionKind::getReadOnly());
544 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
546 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
547 COFF::IMAGE_SCN_MEM_READ,
548 SectionKind::getReadOnly());
550 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
551 COFF::IMAGE_SCN_MEM_READ,
552 SectionKind::getReadOnly());
554 StaticCtorSection = Ctx->getCOFFSection(
555 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
556 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
557 SectionKind::getDataRel());
558 StaticDtorSection = Ctx->getCOFFSection(
559 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
560 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
561 SectionKind::getDataRel());
564 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
565 // though it contains relocatable pointers. In PIC mode, this is probably a
566 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
567 // adjusted or this should be a data section.
568 assert(T.isOSWindows() && "Windows is the only supported COFF target");
569 if (T.getArch() == Triple::x86_64) {
570 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
573 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
574 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
575 COFF::IMAGE_SCN_MEM_READ,
576 SectionKind::getReadOnly());
580 COFFDebugSymbolsSection =
581 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE |
582 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
583 COFF::IMAGE_SCN_MEM_READ,
584 SectionKind::getMetadata());
586 DwarfAbbrevSection = Ctx->getCOFFSection(
588 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
589 COFF::IMAGE_SCN_MEM_READ,
590 SectionKind::getMetadata(), "section_abbrev");
591 DwarfInfoSection = Ctx->getCOFFSection(
593 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
594 COFF::IMAGE_SCN_MEM_READ,
595 SectionKind::getMetadata(), "section_info");
596 DwarfLineSection = Ctx->getCOFFSection(
598 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
599 COFF::IMAGE_SCN_MEM_READ,
600 SectionKind::getMetadata(), "section_line");
602 DwarfFrameSection = Ctx->getCOFFSection(
604 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
605 COFF::IMAGE_SCN_MEM_READ,
606 SectionKind::getMetadata());
607 DwarfPubNamesSection = Ctx->getCOFFSection(
609 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
610 COFF::IMAGE_SCN_MEM_READ,
611 SectionKind::getMetadata());
612 DwarfPubTypesSection = Ctx->getCOFFSection(
614 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
615 COFF::IMAGE_SCN_MEM_READ,
616 SectionKind::getMetadata());
617 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
618 ".debug_gnu_pubnames",
619 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
620 COFF::IMAGE_SCN_MEM_READ,
621 SectionKind::getMetadata());
622 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
623 ".debug_gnu_pubtypes",
624 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
625 COFF::IMAGE_SCN_MEM_READ,
626 SectionKind::getMetadata());
627 DwarfStrSection = Ctx->getCOFFSection(
629 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
630 COFF::IMAGE_SCN_MEM_READ,
631 SectionKind::getMetadata(), "info_string");
632 DwarfLocSection = Ctx->getCOFFSection(
634 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
635 COFF::IMAGE_SCN_MEM_READ,
636 SectionKind::getMetadata(), "section_debug_loc");
637 DwarfARangesSection = Ctx->getCOFFSection(
639 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
640 COFF::IMAGE_SCN_MEM_READ,
641 SectionKind::getMetadata());
642 DwarfRangesSection = Ctx->getCOFFSection(
644 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
645 COFF::IMAGE_SCN_MEM_READ,
646 SectionKind::getMetadata(), "debug_range");
647 DwarfInfoDWOSection = Ctx->getCOFFSection(
649 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
650 COFF::IMAGE_SCN_MEM_READ,
651 SectionKind::getMetadata(), "section_info_dwo");
652 DwarfTypesDWOSection = Ctx->getCOFFSection(
654 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
655 COFF::IMAGE_SCN_MEM_READ,
656 SectionKind::getMetadata(), "section_types_dwo");
657 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
659 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
660 COFF::IMAGE_SCN_MEM_READ,
661 SectionKind::getMetadata(), "section_abbrev_dwo");
662 DwarfStrDWOSection = Ctx->getCOFFSection(
664 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
665 COFF::IMAGE_SCN_MEM_READ,
666 SectionKind::getMetadata(), "skel_string");
667 DwarfLineDWOSection = Ctx->getCOFFSection(
669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
670 COFF::IMAGE_SCN_MEM_READ,
671 SectionKind::getMetadata());
672 DwarfLocDWOSection = Ctx->getCOFFSection(
674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
675 COFF::IMAGE_SCN_MEM_READ,
676 SectionKind::getMetadata(), "skel_loc");
677 DwarfStrOffDWOSection = Ctx->getCOFFSection(
678 ".debug_str_offsets.dwo",
679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
680 COFF::IMAGE_SCN_MEM_READ,
681 SectionKind::getMetadata());
682 DwarfAddrSection = Ctx->getCOFFSection(
684 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
685 COFF::IMAGE_SCN_MEM_READ,
686 SectionKind::getMetadata(), "addr_sec");
687 DwarfAccelNamesSection = Ctx->getCOFFSection(
689 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
690 COFF::IMAGE_SCN_MEM_READ,
691 SectionKind::getMetadata(), "names_begin");
692 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
694 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
695 COFF::IMAGE_SCN_MEM_READ,
696 SectionKind::getMetadata(), "namespac_begin");
697 DwarfAccelTypesSection = Ctx->getCOFFSection(
699 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
700 COFF::IMAGE_SCN_MEM_READ,
701 SectionKind::getMetadata(), "types_begin");
702 DwarfAccelObjCSection = Ctx->getCOFFSection(
704 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
705 COFF::IMAGE_SCN_MEM_READ,
706 SectionKind::getMetadata(), "objc_begin");
708 DrectveSection = Ctx->getCOFFSection(
709 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
710 SectionKind::getMetadata());
712 PDataSection = Ctx->getCOFFSection(
713 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
714 SectionKind::getDataRel());
716 XDataSection = Ctx->getCOFFSection(
717 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
718 SectionKind::getDataRel());
720 TLSDataSection = Ctx->getCOFFSection(
721 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
722 COFF::IMAGE_SCN_MEM_WRITE,
723 SectionKind::getDataRel());
726 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
734 CommDirectiveSupportsAlignment = true;
735 SupportsWeakOmittedEHFrame = true;
736 SupportsCompactUnwindWithoutEHFrame = false;
738 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
739 dwarf::DW_EH_PE_absptr;
741 CompactUnwindDwarfEHFrameOnly = 0;
743 EHFrameSection = nullptr; // Created on demand.
744 CompactUnwindSection = nullptr; // Used only by selected targets.
745 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
746 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
747 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
748 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
752 Triple::ArchType Arch = TT.getArch();
753 // FIXME: Checking for Arch here to filter out bogus triples such as
754 // cellspu-apple-darwin. Perhaps we should fix in Triple?
755 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
756 Arch == Triple::arm || Arch == Triple::thumb ||
757 Arch == Triple::aarch64 ||
758 Arch == Triple::ppc || Arch == Triple::ppc64 ||
759 Arch == Triple::UnknownArch) &&
760 TT.isOSBinFormatMachO()) {
762 InitMachOMCObjectFileInfo(TT);
763 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
764 Arch == Triple::arm || Arch == Triple::thumb) &&
765 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
767 InitCOFFMCObjectFileInfo(TT);
770 InitELFMCObjectFileInfo(TT);
774 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
775 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
779 void MCObjectFileInfo::InitEHFrameSection() {
782 Ctx->getMachOSection("__TEXT", "__eh_frame",
784 MachO::S_ATTR_NO_TOC |
785 MachO::S_ATTR_STRIP_STATIC_SYMS |
786 MachO::S_ATTR_LIVE_SUPPORT,
787 SectionKind::getReadOnly());
788 else if (Env == IsELF)
790 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
793 Ctx->getCOFFSection(".eh_frame",
794 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
795 COFF::IMAGE_SCN_MEM_READ |
796 COFF::IMAGE_SCN_MEM_WRITE,
797 SectionKind::getDataRel());
800 unsigned MCObjectFileInfo::SelectMipsTTypeEncoding() const {
801 // FIXME: The N64 ABI ought to use DW_EH_PE_sdata8 but we can't
802 // identify N64 from just a triple. We currently fix this by
803 // overriding this function in MipsTargetObjectFile.
804 return dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
805 dwarf::DW_EH_PE_sdata4;