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",
188 SectionKind::getMetadata());
189 DwarfAccelObjCSection =
190 Ctx->getMachOSection("__DWARF", "__apple_objc",
192 SectionKind::getMetadata());
193 // 16 character section limit...
194 DwarfAccelNamespaceSection =
195 Ctx->getMachOSection("__DWARF", "__apple_namespac",
197 SectionKind::getMetadata());
198 DwarfAccelTypesSection =
199 Ctx->getMachOSection("__DWARF", "__apple_types",
201 SectionKind::getMetadata());
204 Ctx->getMachOSection("__DWARF", "__debug_abbrev",
206 SectionKind::getMetadata());
208 Ctx->getMachOSection("__DWARF", "__debug_info",
210 SectionKind::getMetadata());
212 Ctx->getMachOSection("__DWARF", "__debug_line",
214 SectionKind::getMetadata());
216 Ctx->getMachOSection("__DWARF", "__debug_frame",
218 SectionKind::getMetadata());
219 DwarfPubNamesSection =
220 Ctx->getMachOSection("__DWARF", "__debug_pubnames",
222 SectionKind::getMetadata());
223 DwarfPubTypesSection =
224 Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
226 SectionKind::getMetadata());
227 DwarfGnuPubNamesSection =
228 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
230 SectionKind::getMetadata());
231 DwarfGnuPubTypesSection =
232 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
234 SectionKind::getMetadata());
236 Ctx->getMachOSection("__DWARF", "__debug_str",
238 SectionKind::getMetadata());
240 Ctx->getMachOSection("__DWARF", "__debug_loc",
242 SectionKind::getMetadata());
243 DwarfARangesSection =
244 Ctx->getMachOSection("__DWARF", "__debug_aranges",
246 SectionKind::getMetadata());
248 Ctx->getMachOSection("__DWARF", "__debug_ranges",
250 SectionKind::getMetadata());
251 DwarfDebugInlineSection =
252 Ctx->getMachOSection("__DWARF", "__debug_inlined",
254 SectionKind::getMetadata());
256 Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
257 SectionKind::getMetadata());
259 TLSExtraDataSection = TLSTLVSection;
262 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
263 switch (T.getArch()) {
266 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
269 case Triple::mips64el:
270 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
273 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
274 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
275 : dwarf::DW_EH_PE_sdata4);
279 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
283 switch (T.getArch()) {
287 case Triple::thumbeb:
288 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
290 // Fallthrough if not using EHABI
293 PersonalityEncoding = (RelocM == Reloc::PIC_)
294 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
295 : dwarf::DW_EH_PE_absptr;
296 LSDAEncoding = (RelocM == Reloc::PIC_)
297 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
298 : dwarf::DW_EH_PE_absptr;
299 TTypeEncoding = (RelocM == Reloc::PIC_)
300 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
301 : dwarf::DW_EH_PE_absptr;
304 if (RelocM == Reloc::PIC_) {
305 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
306 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
307 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
308 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
309 (CMModel == CodeModel::Small
310 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
311 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
312 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
313 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
315 PersonalityEncoding =
316 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
317 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
318 LSDAEncoding = (CMModel == CodeModel::Small)
319 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
320 TTypeEncoding = (CMModel == CodeModel::Small)
321 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
324 case Triple::aarch64:
325 case Triple::aarch64_be:
326 // The small model guarantees static code/data size < 4GB, but not where it
327 // will be in memory. Most of these could end up >2GB away so even a signed
328 // pc-relative 32-bit address is insufficient, theoretically.
329 if (RelocM == Reloc::PIC_) {
330 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
331 dwarf::DW_EH_PE_sdata8;
332 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
333 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
334 dwarf::DW_EH_PE_sdata8;
336 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
337 LSDAEncoding = dwarf::DW_EH_PE_absptr;
338 TTypeEncoding = dwarf::DW_EH_PE_absptr;
344 case Triple::mips64el:
345 // MIPS uses indirect pointer to refer personality functions, so that the
346 // eh_frame section can be read-only. DW.ref.personality will be generated
348 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
351 case Triple::ppc64le:
352 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
353 dwarf::DW_EH_PE_udata8;
354 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
355 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
356 dwarf::DW_EH_PE_udata8;
359 if (RelocM == Reloc::PIC_) {
360 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
361 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
362 dwarf::DW_EH_PE_sdata4;
363 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
364 dwarf::DW_EH_PE_sdata4;
366 LSDAEncoding = dwarf::DW_EH_PE_absptr;
367 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
368 TTypeEncoding = dwarf::DW_EH_PE_absptr;
371 case Triple::sparcv9:
372 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
373 if (RelocM == Reloc::PIC_) {
374 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
375 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 TTypeEncoding = dwarf::DW_EH_PE_absptr;
383 case Triple::systemz:
384 // All currently-defined code models guarantee that 4-byte PC-relative
385 // values will be in range.
386 if (RelocM == Reloc::PIC_) {
387 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
388 dwarf::DW_EH_PE_sdata4;
389 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
390 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
391 dwarf::DW_EH_PE_sdata4;
393 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
394 LSDAEncoding = dwarf::DW_EH_PE_absptr;
395 TTypeEncoding = dwarf::DW_EH_PE_absptr;
402 // Solaris requires different flags for .eh_frame to seemingly every other
404 EHSectionType = ELF::SHT_PROGBITS;
405 EHSectionFlags = ELF::SHF_ALLOC;
406 if (T.isOSSolaris()) {
407 if (T.getArch() == Triple::x86_64)
408 EHSectionType = ELF::SHT_X86_64_UNWIND;
410 EHSectionFlags |= ELF::SHF_WRITE;
415 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
416 ELF::SHF_WRITE | ELF::SHF_ALLOC);
418 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
419 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
421 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
422 ELF::SHF_WRITE | ELF::SHF_ALLOC);
425 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
428 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
429 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
431 TLSBSSSection = Ctx->getELFSection(
432 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
434 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
435 ELF::SHF_ALLOC | ELF::SHF_WRITE);
437 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
438 ELF::SHF_ALLOC | ELF::SHF_WRITE);
440 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
441 ELF::SHF_ALLOC | ELF::SHF_WRITE);
443 DataRelROLocalSection = Ctx->getELFSection(
444 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE);
446 MergeableConst4Section =
447 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
448 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
450 MergeableConst8Section =
451 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
452 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
454 MergeableConst16Section =
455 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
456 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
458 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
459 ELF::SHF_ALLOC | ELF::SHF_WRITE);
461 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
462 ELF::SHF_ALLOC | ELF::SHF_WRITE);
464 // Exception Handling Sections.
466 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
467 // it contains relocatable pointers. In PIC mode, this is probably a big
468 // runtime hit for C++ apps. Either the contents of the LSDA need to be
469 // adjusted or this should be a data section.
470 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
473 COFFDebugSymbolsSection = nullptr;
475 // Debug Info Sections.
477 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0);
478 DwarfInfoSection = Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0);
479 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
480 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
481 DwarfPubNamesSection =
482 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
483 DwarfPubTypesSection =
484 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
485 DwarfGnuPubNamesSection =
486 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
487 DwarfGnuPubTypesSection =
488 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
490 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
491 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
492 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
493 DwarfARangesSection =
494 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
496 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0);
498 // DWARF5 Experimental Debug Info
500 // Accelerator Tables
501 DwarfAccelNamesSection =
502 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0);
503 DwarfAccelObjCSection =
504 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0);
505 DwarfAccelNamespaceSection =
506 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0);
507 DwarfAccelTypesSection =
508 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0);
511 DwarfInfoDWOSection =
512 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
513 DwarfTypesDWOSection =
514 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
515 DwarfAbbrevDWOSection =
516 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
518 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
519 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
520 DwarfLineDWOSection =
521 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
523 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0);
524 DwarfStrOffDWOSection =
525 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
526 DwarfAddrSection = Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0);
529 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
533 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
534 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
536 CommDirectiveSupportsAlignment = true;
540 Ctx->getCOFFSection(".bss",
541 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
542 COFF::IMAGE_SCN_MEM_READ |
543 COFF::IMAGE_SCN_MEM_WRITE,
544 SectionKind::getBSS());
546 Ctx->getCOFFSection(".text",
547 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT
548 : (COFF::SectionCharacteristics)0) |
549 COFF::IMAGE_SCN_CNT_CODE |
550 COFF::IMAGE_SCN_MEM_EXECUTE |
551 COFF::IMAGE_SCN_MEM_READ,
552 SectionKind::getText());
554 Ctx->getCOFFSection(".data",
555 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
556 COFF::IMAGE_SCN_MEM_READ |
557 COFF::IMAGE_SCN_MEM_WRITE,
558 SectionKind::getDataRel());
560 Ctx->getCOFFSection(".rdata",
561 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
562 COFF::IMAGE_SCN_MEM_READ,
563 SectionKind::getReadOnly());
565 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
567 Ctx->getCOFFSection(".CRT$XCU",
568 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
569 COFF::IMAGE_SCN_MEM_READ,
570 SectionKind::getReadOnly());
572 Ctx->getCOFFSection(".CRT$XTX",
573 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
574 COFF::IMAGE_SCN_MEM_READ,
575 SectionKind::getReadOnly());
578 Ctx->getCOFFSection(".ctors",
579 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
580 COFF::IMAGE_SCN_MEM_READ |
581 COFF::IMAGE_SCN_MEM_WRITE,
582 SectionKind::getDataRel());
584 Ctx->getCOFFSection(".dtors",
585 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
586 COFF::IMAGE_SCN_MEM_READ |
587 COFF::IMAGE_SCN_MEM_WRITE,
588 SectionKind::getDataRel());
591 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
592 // though it contains relocatable pointers. In PIC mode, this is probably a
593 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
594 // adjusted or this should be a data section.
595 assert(T.isOSWindows() && "Windows is the only supported COFF target");
596 if (T.getArch() == Triple::x86_64) {
597 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
600 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
601 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
602 COFF::IMAGE_SCN_MEM_READ,
603 SectionKind::getReadOnly());
607 COFFDebugSymbolsSection =
608 Ctx->getCOFFSection(".debug$S",
609 COFF::IMAGE_SCN_MEM_DISCARDABLE |
610 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
611 COFF::IMAGE_SCN_MEM_READ,
612 SectionKind::getMetadata());
615 Ctx->getCOFFSection(".debug_abbrev",
616 COFF::IMAGE_SCN_MEM_DISCARDABLE |
617 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
618 COFF::IMAGE_SCN_MEM_READ,
619 SectionKind::getMetadata());
621 Ctx->getCOFFSection(".debug_info",
622 COFF::IMAGE_SCN_MEM_DISCARDABLE |
623 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
624 COFF::IMAGE_SCN_MEM_READ,
625 SectionKind::getMetadata());
627 Ctx->getCOFFSection(".debug_line",
628 COFF::IMAGE_SCN_MEM_DISCARDABLE |
629 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
630 COFF::IMAGE_SCN_MEM_READ,
631 SectionKind::getMetadata());
633 Ctx->getCOFFSection(".debug_frame",
634 COFF::IMAGE_SCN_MEM_DISCARDABLE |
635 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
636 COFF::IMAGE_SCN_MEM_READ,
637 SectionKind::getMetadata());
638 DwarfPubNamesSection =
639 Ctx->getCOFFSection(".debug_pubnames",
640 COFF::IMAGE_SCN_MEM_DISCARDABLE |
641 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
642 COFF::IMAGE_SCN_MEM_READ,
643 SectionKind::getMetadata());
644 DwarfPubTypesSection =
645 Ctx->getCOFFSection(".debug_pubtypes",
646 COFF::IMAGE_SCN_MEM_DISCARDABLE |
647 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
648 COFF::IMAGE_SCN_MEM_READ,
649 SectionKind::getMetadata());
650 DwarfGnuPubNamesSection =
651 Ctx->getCOFFSection(".debug_gnu_pubnames",
652 COFF::IMAGE_SCN_MEM_DISCARDABLE |
653 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
654 COFF::IMAGE_SCN_MEM_READ,
655 SectionKind::getMetadata());
656 DwarfGnuPubTypesSection =
657 Ctx->getCOFFSection(".debug_gnu_pubtypes",
658 COFF::IMAGE_SCN_MEM_DISCARDABLE |
659 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
660 COFF::IMAGE_SCN_MEM_READ,
661 SectionKind::getMetadata());
663 Ctx->getCOFFSection(".debug_str",
664 COFF::IMAGE_SCN_MEM_DISCARDABLE |
665 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
666 COFF::IMAGE_SCN_MEM_READ,
667 SectionKind::getMetadata());
669 Ctx->getCOFFSection(".debug_loc",
670 COFF::IMAGE_SCN_MEM_DISCARDABLE |
671 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
672 COFF::IMAGE_SCN_MEM_READ,
673 SectionKind::getMetadata());
674 DwarfARangesSection =
675 Ctx->getCOFFSection(".debug_aranges",
676 COFF::IMAGE_SCN_MEM_DISCARDABLE |
677 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
678 COFF::IMAGE_SCN_MEM_READ,
679 SectionKind::getMetadata());
681 Ctx->getCOFFSection(".debug_ranges",
682 COFF::IMAGE_SCN_MEM_DISCARDABLE |
683 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
684 COFF::IMAGE_SCN_MEM_READ,
685 SectionKind::getMetadata());
686 DwarfInfoDWOSection =
687 Ctx->getCOFFSection(".debug_info.dwo",
688 COFF::IMAGE_SCN_MEM_DISCARDABLE |
689 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
690 COFF::IMAGE_SCN_MEM_READ,
691 SectionKind::getMetadata());
692 DwarfTypesDWOSection =
693 Ctx->getCOFFSection(".debug_types.dwo",
694 COFF::IMAGE_SCN_MEM_DISCARDABLE |
695 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
696 COFF::IMAGE_SCN_MEM_READ,
697 SectionKind::getMetadata());
698 DwarfAbbrevDWOSection =
699 Ctx->getCOFFSection(".debug_abbrev.dwo",
700 COFF::IMAGE_SCN_MEM_DISCARDABLE |
701 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
702 COFF::IMAGE_SCN_MEM_READ,
703 SectionKind::getMetadata());
705 Ctx->getCOFFSection(".debug_str.dwo",
706 COFF::IMAGE_SCN_MEM_DISCARDABLE |
707 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
708 COFF::IMAGE_SCN_MEM_READ,
709 SectionKind::getMetadata());
710 DwarfLineDWOSection =
711 Ctx->getCOFFSection(".debug_line.dwo",
712 COFF::IMAGE_SCN_MEM_DISCARDABLE |
713 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
714 COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getMetadata());
717 Ctx->getCOFFSection(".debug_loc.dwo",
718 COFF::IMAGE_SCN_MEM_DISCARDABLE |
719 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
720 COFF::IMAGE_SCN_MEM_READ,
721 SectionKind::getMetadata());
722 DwarfStrOffDWOSection =
723 Ctx->getCOFFSection(".debug_str_offsets.dwo",
724 COFF::IMAGE_SCN_MEM_DISCARDABLE |
725 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
726 COFF::IMAGE_SCN_MEM_READ,
727 SectionKind::getMetadata());
729 Ctx->getCOFFSection(".debug_addr",
730 COFF::IMAGE_SCN_MEM_DISCARDABLE |
731 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
732 COFF::IMAGE_SCN_MEM_READ,
733 SectionKind::getMetadata());
734 DwarfAccelNamesSection =
735 Ctx->getCOFFSection(".apple_names",
736 COFF::IMAGE_SCN_MEM_DISCARDABLE |
737 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
738 COFF::IMAGE_SCN_MEM_READ,
739 SectionKind::getMetadata());
740 DwarfAccelNamespaceSection =
741 Ctx->getCOFFSection(".apple_namespaces",
742 COFF::IMAGE_SCN_MEM_DISCARDABLE |
743 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
744 COFF::IMAGE_SCN_MEM_READ,
745 SectionKind::getMetadata());
746 DwarfAccelTypesSection =
747 Ctx->getCOFFSection(".apple_types",
748 COFF::IMAGE_SCN_MEM_DISCARDABLE |
749 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
750 COFF::IMAGE_SCN_MEM_READ,
751 SectionKind::getMetadata());
752 DwarfAccelObjCSection =
753 Ctx->getCOFFSection(".apple_objc",
754 COFF::IMAGE_SCN_MEM_DISCARDABLE |
755 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
756 COFF::IMAGE_SCN_MEM_READ,
757 SectionKind::getMetadata());
760 Ctx->getCOFFSection(".drectve",
761 COFF::IMAGE_SCN_LNK_INFO |
762 COFF::IMAGE_SCN_LNK_REMOVE,
763 SectionKind::getMetadata());
766 Ctx->getCOFFSection(".pdata",
767 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
768 COFF::IMAGE_SCN_MEM_READ,
769 SectionKind::getDataRel());
772 Ctx->getCOFFSection(".xdata",
773 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
774 COFF::IMAGE_SCN_MEM_READ,
775 SectionKind::getDataRel());
778 Ctx->getCOFFSection(".tls$",
779 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
780 COFF::IMAGE_SCN_MEM_READ |
781 COFF::IMAGE_SCN_MEM_WRITE,
782 SectionKind::getDataRel());
785 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
793 CommDirectiveSupportsAlignment = true;
794 SupportsWeakOmittedEHFrame = true;
795 SupportsCompactUnwindWithoutEHFrame = false;
797 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
798 dwarf::DW_EH_PE_absptr;
800 CompactUnwindDwarfEHFrameOnly = 0;
802 EHFrameSection = nullptr; // Created on demand.
803 CompactUnwindSection = nullptr; // Used only by selected targets.
804 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
805 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
806 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
807 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
811 Triple::ArchType Arch = TT.getArch();
812 // FIXME: Checking for Arch here to filter out bogus triples such as
813 // cellspu-apple-darwin. Perhaps we should fix in Triple?
814 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
815 Arch == Triple::arm || Arch == Triple::thumb ||
816 Arch == Triple::aarch64 ||
817 Arch == Triple::ppc || Arch == Triple::ppc64 ||
818 Arch == Triple::UnknownArch) &&
819 (TT.isOSDarwin() || TT.isOSBinFormatMachO())) {
821 InitMachOMCObjectFileInfo(TT);
822 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
823 Arch == Triple::arm || Arch == Triple::thumb) &&
824 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
826 InitCOFFMCObjectFileInfo(TT);
829 InitELFMCObjectFileInfo(TT);
833 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
834 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
838 void MCObjectFileInfo::InitEHFrameSection() {
841 Ctx->getMachOSection("__TEXT", "__eh_frame",
843 MachO::S_ATTR_NO_TOC |
844 MachO::S_ATTR_STRIP_STATIC_SYMS |
845 MachO::S_ATTR_LIVE_SUPPORT,
846 SectionKind::getReadOnly());
847 else if (Env == IsELF)
849 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
852 Ctx->getCOFFSection(".eh_frame",
853 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
854 COFF::IMAGE_SCN_MEM_READ |
855 COFF::IMAGE_SCN_MEM_WRITE,
856 SectionKind::getDataRel());