1 //===-- MCObjectFileInfo.cpp - Object File Information --------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/MC/MCObjectFileInfo.h"
11 #include "llvm/ADT/StringExtras.h"
12 #include "llvm/ADT/Triple.h"
13 #include "llvm/BinaryFormat/COFF.h"
14 #include "llvm/BinaryFormat/ELF.h"
15 #include "llvm/MC/MCAsmInfo.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCSection.h"
18 #include "llvm/MC/MCSectionCOFF.h"
19 #include "llvm/MC/MCSectionELF.h"
20 #include "llvm/MC/MCSectionMachO.h"
21 #include "llvm/MC/MCSectionWasm.h"
22
23 using namespace llvm;
24
useCompactUnwind(const Triple & T)25 static bool useCompactUnwind(const Triple &T) {
26 // Only on darwin.
27 if (!T.isOSDarwin())
28 return false;
29
30 // aarch64 always has it.
31 if (T.getArch() == Triple::aarch64)
32 return true;
33
34 // armv7k always has it.
35 if (T.isWatchABI())
36 return true;
37
38 // Use it on newer version of OS X.
39 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
40 return true;
41
42 // And the iOS simulator.
43 if (T.isiOS() &&
44 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
45 return true;
46
47 return false;
48 }
49
initMachOMCObjectFileInfo(const Triple & T)50 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
51 // MachO
52 SupportsWeakOmittedEHFrame = false;
53
54 EHFrameSection = Ctx->getMachOSection(
55 "__TEXT", "__eh_frame",
56 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
57 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
58 SectionKind::getReadOnly());
59
60 if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
61 SupportsCompactUnwindWithoutEHFrame = true;
62
63 if (T.isWatchABI())
64 OmitDwarfIfHaveCompactUnwind = true;
65
66 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
67 | dwarf::DW_EH_PE_sdata4;
68 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
69 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
70 dwarf::DW_EH_PE_sdata4;
71
72 // .comm doesn't support alignment before Leopard.
73 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
74 CommDirectiveSupportsAlignment = false;
75
76 TextSection // .text
77 = Ctx->getMachOSection("__TEXT", "__text",
78 MachO::S_ATTR_PURE_INSTRUCTIONS,
79 SectionKind::getText());
80 DataSection // .data
81 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData());
82
83 // BSSSection might not be expected initialized on msvc.
84 BSSSection = nullptr;
85
86 TLSDataSection // .tdata
87 = Ctx->getMachOSection("__DATA", "__thread_data",
88 MachO::S_THREAD_LOCAL_REGULAR,
89 SectionKind::getData());
90 TLSBSSSection // .tbss
91 = Ctx->getMachOSection("__DATA", "__thread_bss",
92 MachO::S_THREAD_LOCAL_ZEROFILL,
93 SectionKind::getThreadBSS());
94
95 // TODO: Verify datarel below.
96 TLSTLVSection // .tlv
97 = Ctx->getMachOSection("__DATA", "__thread_vars",
98 MachO::S_THREAD_LOCAL_VARIABLES,
99 SectionKind::getData());
100
101 TLSThreadInitSection = Ctx->getMachOSection(
102 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
103 SectionKind::getData());
104
105 CStringSection // .cstring
106 = Ctx->getMachOSection("__TEXT", "__cstring",
107 MachO::S_CSTRING_LITERALS,
108 SectionKind::getMergeable1ByteCString());
109 UStringSection
110 = Ctx->getMachOSection("__TEXT","__ustring", 0,
111 SectionKind::getMergeable2ByteCString());
112 FourByteConstantSection // .literal4
113 = Ctx->getMachOSection("__TEXT", "__literal4",
114 MachO::S_4BYTE_LITERALS,
115 SectionKind::getMergeableConst4());
116 EightByteConstantSection // .literal8
117 = Ctx->getMachOSection("__TEXT", "__literal8",
118 MachO::S_8BYTE_LITERALS,
119 SectionKind::getMergeableConst8());
120
121 SixteenByteConstantSection // .literal16
122 = Ctx->getMachOSection("__TEXT", "__literal16",
123 MachO::S_16BYTE_LITERALS,
124 SectionKind::getMergeableConst16());
125
126 ReadOnlySection // .const
127 = Ctx->getMachOSection("__TEXT", "__const", 0,
128 SectionKind::getReadOnly());
129
130 // If the target is not powerpc, map the coal sections to the non-coal
131 // sections.
132 //
133 // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
134 // "__TEXT/__const_coal" => section "__TEXT/__const"
135 // "__DATA/__datacoal_nt" => section "__DATA/__data"
136 Triple::ArchType ArchTy = T.getArch();
137
138 ConstDataSection // .const_data
139 = Ctx->getMachOSection("__DATA", "__const", 0,
140 SectionKind::getReadOnlyWithRel());
141
142 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
143 TextCoalSection
144 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
145 MachO::S_COALESCED |
146 MachO::S_ATTR_PURE_INSTRUCTIONS,
147 SectionKind::getText());
148 ConstTextCoalSection
149 = Ctx->getMachOSection("__TEXT", "__const_coal",
150 MachO::S_COALESCED,
151 SectionKind::getReadOnly());
152 DataCoalSection = Ctx->getMachOSection(
153 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
154 ConstDataCoalSection = DataCoalSection;
155 } else {
156 TextCoalSection = TextSection;
157 ConstTextCoalSection = ReadOnlySection;
158 DataCoalSection = DataSection;
159 ConstDataCoalSection = ConstDataSection;
160 }
161
162 DataCommonSection
163 = Ctx->getMachOSection("__DATA","__common",
164 MachO::S_ZEROFILL,
165 SectionKind::getBSS());
166 DataBSSSection
167 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
168 SectionKind::getBSS());
169
170
171 LazySymbolPointerSection
172 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
173 MachO::S_LAZY_SYMBOL_POINTERS,
174 SectionKind::getMetadata());
175 NonLazySymbolPointerSection
176 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
177 MachO::S_NON_LAZY_SYMBOL_POINTERS,
178 SectionKind::getMetadata());
179
180 ThreadLocalPointerSection
181 = Ctx->getMachOSection("__DATA", "__thread_ptr",
182 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
183 SectionKind::getMetadata());
184
185 // Exception Handling.
186 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
187 SectionKind::getReadOnlyWithRel());
188
189 COFFDebugSymbolsSection = nullptr;
190 COFFDebugTypesSection = nullptr;
191 COFFGlobalTypeHashesSection = nullptr;
192
193 if (useCompactUnwind(T)) {
194 CompactUnwindSection =
195 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
196 SectionKind::getReadOnly());
197
198 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
199 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF
200 else if (T.getArch() == Triple::aarch64)
201 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF
202 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
203 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF
204 }
205
206 // Debug Information.
207 DwarfDebugNamesSection =
208 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG,
209 SectionKind::getMetadata(), "debug_names_begin");
210 DwarfAccelNamesSection =
211 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
212 SectionKind::getMetadata(), "names_begin");
213 DwarfAccelObjCSection =
214 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
215 SectionKind::getMetadata(), "objc_begin");
216 // 16 character section limit...
217 DwarfAccelNamespaceSection =
218 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
219 SectionKind::getMetadata(), "namespac_begin");
220 DwarfAccelTypesSection =
221 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
222 SectionKind::getMetadata(), "types_begin");
223
224 DwarfSwiftASTSection =
225 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG,
226 SectionKind::getMetadata());
227
228 DwarfAbbrevSection =
229 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
230 SectionKind::getMetadata(), "section_abbrev");
231 DwarfInfoSection =
232 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
233 SectionKind::getMetadata(), "section_info");
234 DwarfLineSection =
235 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
236 SectionKind::getMetadata(), "section_line");
237 DwarfLineStrSection =
238 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG,
239 SectionKind::getMetadata(), "section_line_str");
240 DwarfFrameSection =
241 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
242 SectionKind::getMetadata());
243 DwarfPubNamesSection =
244 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
245 SectionKind::getMetadata());
246 DwarfPubTypesSection =
247 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
248 SectionKind::getMetadata());
249 DwarfGnuPubNamesSection =
250 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
251 SectionKind::getMetadata());
252 DwarfGnuPubTypesSection =
253 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
254 SectionKind::getMetadata());
255 DwarfStrSection =
256 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
257 SectionKind::getMetadata(), "info_string");
258 DwarfStrOffSection =
259 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG,
260 SectionKind::getMetadata(), "section_str_off");
261 DwarfLocSection =
262 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
263 SectionKind::getMetadata(), "section_debug_loc");
264 DwarfARangesSection =
265 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
266 SectionKind::getMetadata());
267 DwarfRangesSection =
268 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
269 SectionKind::getMetadata(), "debug_range");
270 DwarfRnglistsSection =
271 Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG,
272 SectionKind::getMetadata(), "debug_range");
273 DwarfMacinfoSection =
274 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
275 SectionKind::getMetadata(), "debug_macinfo");
276 DwarfDebugInlineSection =
277 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
278 SectionKind::getMetadata());
279 DwarfCUIndexSection =
280 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
281 SectionKind::getMetadata());
282 DwarfTUIndexSection =
283 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
284 SectionKind::getMetadata());
285 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
286 0, SectionKind::getMetadata());
287
288 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
289 0, SectionKind::getMetadata());
290
291 TLSExtraDataSection = TLSTLVSection;
292 }
293
initELFMCObjectFileInfo(const Triple & T,bool Large)294 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
295 switch (T.getArch()) {
296 case Triple::mips:
297 case Triple::mipsel:
298 FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
299 break;
300 case Triple::mips64:
301 case Triple::mips64el:
302 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
303 break;
304 case Triple::ppc64:
305 case Triple::ppc64le:
306 case Triple::x86_64:
307 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
308 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
309 break;
310 case Triple::bpfel:
311 case Triple::bpfeb:
312 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
313 break;
314 default:
315 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
316 break;
317 }
318
319 switch (T.getArch()) {
320 case Triple::arm:
321 case Triple::armeb:
322 case Triple::thumb:
323 case Triple::thumbeb:
324 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
325 break;
326 // Fallthrough if not using EHABI
327 LLVM_FALLTHROUGH;
328 case Triple::ppc:
329 case Triple::x86:
330 PersonalityEncoding = PositionIndependent
331 ? dwarf::DW_EH_PE_indirect |
332 dwarf::DW_EH_PE_pcrel |
333 dwarf::DW_EH_PE_sdata4
334 : dwarf::DW_EH_PE_absptr;
335 LSDAEncoding = PositionIndependent
336 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
337 : dwarf::DW_EH_PE_absptr;
338 TTypeEncoding = PositionIndependent
339 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
340 dwarf::DW_EH_PE_sdata4
341 : dwarf::DW_EH_PE_absptr;
342 break;
343 case Triple::x86_64:
344 if (PositionIndependent) {
345 PersonalityEncoding =
346 dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
347 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
348 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
349 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
350 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
351 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
352 } else {
353 PersonalityEncoding =
354 Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4;
355 LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4;
356 TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4;
357 }
358 break;
359 case Triple::hexagon:
360 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
361 LSDAEncoding = dwarf::DW_EH_PE_absptr;
362 FDECFIEncoding = dwarf::DW_EH_PE_absptr;
363 TTypeEncoding = dwarf::DW_EH_PE_absptr;
364 if (PositionIndependent) {
365 PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
366 LSDAEncoding |= dwarf::DW_EH_PE_pcrel;
367 FDECFIEncoding |= dwarf::DW_EH_PE_pcrel;
368 TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
369 }
370 break;
371 case Triple::aarch64:
372 case Triple::aarch64_be:
373 // The small model guarantees static code/data size < 4GB, but not where it
374 // will be in memory. Most of these could end up >2GB away so even a signed
375 // pc-relative 32-bit address is insufficient, theoretically.
376 if (PositionIndependent) {
377 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
378 dwarf::DW_EH_PE_sdata8;
379 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
380 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
381 dwarf::DW_EH_PE_sdata8;
382 } else {
383 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
384 LSDAEncoding = dwarf::DW_EH_PE_absptr;
385 TTypeEncoding = dwarf::DW_EH_PE_absptr;
386 }
387 break;
388 case Triple::lanai:
389 LSDAEncoding = dwarf::DW_EH_PE_absptr;
390 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
391 TTypeEncoding = dwarf::DW_EH_PE_absptr;
392 break;
393 case Triple::mips:
394 case Triple::mipsel:
395 case Triple::mips64:
396 case Triple::mips64el:
397 // MIPS uses indirect pointer to refer personality functions and types, so
398 // that the eh_frame section can be read-only. DW.ref.personality will be
399 // generated for relocation.
400 PersonalityEncoding = dwarf::DW_EH_PE_indirect;
401 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
402 // identify N64 from just a triple.
403 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
404 dwarf::DW_EH_PE_sdata4;
405 // We don't support PC-relative LSDA references in GAS so we use the default
406 // DW_EH_PE_absptr for those.
407
408 // FreeBSD must be explicit about the data size and using pcrel since it's
409 // assembler/linker won't do the automatic conversion that the Linux tools
410 // do.
411 if (T.isOSFreeBSD()) {
412 PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
413 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
414 }
415 break;
416 case Triple::ppc64:
417 case Triple::ppc64le:
418 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
419 dwarf::DW_EH_PE_udata8;
420 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
421 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
422 dwarf::DW_EH_PE_udata8;
423 break;
424 case Triple::sparcel:
425 case Triple::sparc:
426 if (PositionIndependent) {
427 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
428 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
429 dwarf::DW_EH_PE_sdata4;
430 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
431 dwarf::DW_EH_PE_sdata4;
432 } else {
433 LSDAEncoding = dwarf::DW_EH_PE_absptr;
434 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
435 TTypeEncoding = dwarf::DW_EH_PE_absptr;
436 }
437 break;
438 case Triple::sparcv9:
439 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
440 if (PositionIndependent) {
441 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
442 dwarf::DW_EH_PE_sdata4;
443 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
444 dwarf::DW_EH_PE_sdata4;
445 } else {
446 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
447 TTypeEncoding = dwarf::DW_EH_PE_absptr;
448 }
449 break;
450 case Triple::systemz:
451 // All currently-defined code models guarantee that 4-byte PC-relative
452 // values will be in range.
453 if (PositionIndependent) {
454 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
455 dwarf::DW_EH_PE_sdata4;
456 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
457 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
458 dwarf::DW_EH_PE_sdata4;
459 } else {
460 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
461 LSDAEncoding = dwarf::DW_EH_PE_absptr;
462 TTypeEncoding = dwarf::DW_EH_PE_absptr;
463 }
464 break;
465 default:
466 break;
467 }
468
469 unsigned EHSectionType = T.getArch() == Triple::x86_64
470 ? ELF::SHT_X86_64_UNWIND
471 : ELF::SHT_PROGBITS;
472
473 // Solaris requires different flags for .eh_frame to seemingly every other
474 // platform.
475 unsigned EHSectionFlags = ELF::SHF_ALLOC;
476 if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
477 EHSectionFlags |= ELF::SHF_WRITE;
478
479 // ELF
480 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
481 ELF::SHF_WRITE | ELF::SHF_ALLOC);
482
483 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
484 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
485
486 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
487 ELF::SHF_WRITE | ELF::SHF_ALLOC);
488
489 ReadOnlySection =
490 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
491
492 TLSDataSection =
493 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
494 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
495
496 TLSBSSSection = Ctx->getELFSection(
497 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
498
499 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
500 ELF::SHF_ALLOC | ELF::SHF_WRITE);
501
502 MergeableConst4Section =
503 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
504 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
505
506 MergeableConst8Section =
507 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
508 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
509
510 MergeableConst16Section =
511 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
512 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
513
514 MergeableConst32Section =
515 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
516 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
517
518 // Exception Handling Sections.
519
520 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
521 // it contains relocatable pointers. In PIC mode, this is probably a big
522 // runtime hit for C++ apps. Either the contents of the LSDA need to be
523 // adjusted or this should be a data section.
524 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
525 ELF::SHF_ALLOC);
526
527 COFFDebugSymbolsSection = nullptr;
528 COFFDebugTypesSection = nullptr;
529
530 unsigned DebugSecType = ELF::SHT_PROGBITS;
531
532 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type
533 // to distinguish among sections contain DWARF and ECOFF debug formats.
534 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS.
535 if (T.isMIPS())
536 DebugSecType = ELF::SHT_MIPS_DWARF;
537
538 // Debug Info Sections.
539 DwarfAbbrevSection =
540 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0);
541 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0);
542 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0);
543 DwarfLineStrSection =
544 Ctx->getELFSection(".debug_line_str", DebugSecType,
545 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
546 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0);
547 DwarfPubNamesSection =
548 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0);
549 DwarfPubTypesSection =
550 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0);
551 DwarfGnuPubNamesSection =
552 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0);
553 DwarfGnuPubTypesSection =
554 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0);
555 DwarfStrSection =
556 Ctx->getELFSection(".debug_str", DebugSecType,
557 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
558 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0);
559 DwarfARangesSection =
560 Ctx->getELFSection(".debug_aranges", DebugSecType, 0);
561 DwarfRangesSection =
562 Ctx->getELFSection(".debug_ranges", DebugSecType, 0);
563 DwarfMacinfoSection =
564 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0);
565
566 // DWARF5 Experimental Debug Info
567
568 // Accelerator Tables
569 DwarfDebugNamesSection =
570 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0);
571 DwarfAccelNamesSection =
572 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0);
573 DwarfAccelObjCSection =
574 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0);
575 DwarfAccelNamespaceSection =
576 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0);
577 DwarfAccelTypesSection =
578 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0);
579
580 // String Offset and Address Sections
581 DwarfStrOffSection =
582 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0);
583 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0);
584 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0);
585
586 // Fission Sections
587 DwarfInfoDWOSection =
588 Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0);
589 DwarfTypesDWOSection =
590 Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0);
591 DwarfAbbrevDWOSection =
592 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0);
593 DwarfStrDWOSection =
594 Ctx->getELFSection(".debug_str.dwo", DebugSecType,
595 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
596 DwarfLineDWOSection =
597 Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0);
598 DwarfLocDWOSection =
599 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0);
600 DwarfStrOffDWOSection =
601 Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0);
602 DwarfRnglistsDWOSection =
603 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, 0);
604
605 // DWP Sections
606 DwarfCUIndexSection =
607 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0);
608 DwarfTUIndexSection =
609 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0);
610
611 StackMapSection =
612 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
613
614 FaultMapSection =
615 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
616
617 EHFrameSection =
618 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
619
620 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0);
621 }
622
initCOFFMCObjectFileInfo(const Triple & T)623 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
624 EHFrameSection = Ctx->getCOFFSection(
625 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
626 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
627 SectionKind::getData());
628
629 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is
630 // used to indicate to the linker that the text segment contains thumb instructions
631 // and to set the ISA selection bit for calls accordingly.
632 const bool IsThumb = T.getArch() == Triple::thumb;
633
634 CommDirectiveSupportsAlignment = true;
635
636 // COFF
637 BSSSection = Ctx->getCOFFSection(
638 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
640 SectionKind::getBSS());
641 TextSection = Ctx->getCOFFSection(
642 ".text",
643 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
644 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
645 COFF::IMAGE_SCN_MEM_READ,
646 SectionKind::getText());
647 DataSection = Ctx->getCOFFSection(
648 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
649 COFF::IMAGE_SCN_MEM_WRITE,
650 SectionKind::getData());
651 ReadOnlySection = Ctx->getCOFFSection(
652 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
653 SectionKind::getReadOnly());
654
655 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
656 // though it contains relocatable pointers. In PIC mode, this is probably a
657 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
658 // adjusted or this should be a data section.
659 if (T.getArch() == Triple::x86_64) {
660 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
661 LSDASection = nullptr;
662 } else {
663 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
664 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
665 COFF::IMAGE_SCN_MEM_READ,
666 SectionKind::getReadOnly());
667 }
668
669 // Debug info.
670 COFFDebugSymbolsSection =
671 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
672 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
673 COFF::IMAGE_SCN_MEM_READ),
674 SectionKind::getMetadata());
675 COFFDebugTypesSection =
676 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
677 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
678 COFF::IMAGE_SCN_MEM_READ),
679 SectionKind::getMetadata());
680 COFFGlobalTypeHashesSection = Ctx->getCOFFSection(
681 ".debug$H",
682 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
683 COFF::IMAGE_SCN_MEM_READ),
684 SectionKind::getMetadata());
685
686 DwarfAbbrevSection = Ctx->getCOFFSection(
687 ".debug_abbrev",
688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
689 COFF::IMAGE_SCN_MEM_READ,
690 SectionKind::getMetadata(), "section_abbrev");
691 DwarfInfoSection = Ctx->getCOFFSection(
692 ".debug_info",
693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
694 COFF::IMAGE_SCN_MEM_READ,
695 SectionKind::getMetadata(), "section_info");
696 DwarfLineSection = Ctx->getCOFFSection(
697 ".debug_line",
698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
699 COFF::IMAGE_SCN_MEM_READ,
700 SectionKind::getMetadata(), "section_line");
701 DwarfLineStrSection = Ctx->getCOFFSection(
702 ".debug_line_str",
703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
704 COFF::IMAGE_SCN_MEM_READ,
705 SectionKind::getMetadata(), "section_line_str");
706 DwarfFrameSection = Ctx->getCOFFSection(
707 ".debug_frame",
708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
709 COFF::IMAGE_SCN_MEM_READ,
710 SectionKind::getMetadata());
711 DwarfPubNamesSection = Ctx->getCOFFSection(
712 ".debug_pubnames",
713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
714 COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getMetadata());
716 DwarfPubTypesSection = Ctx->getCOFFSection(
717 ".debug_pubtypes",
718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
719 COFF::IMAGE_SCN_MEM_READ,
720 SectionKind::getMetadata());
721 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
722 ".debug_gnu_pubnames",
723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
724 COFF::IMAGE_SCN_MEM_READ,
725 SectionKind::getMetadata());
726 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
727 ".debug_gnu_pubtypes",
728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
729 COFF::IMAGE_SCN_MEM_READ,
730 SectionKind::getMetadata());
731 DwarfStrSection = Ctx->getCOFFSection(
732 ".debug_str",
733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
734 COFF::IMAGE_SCN_MEM_READ,
735 SectionKind::getMetadata(), "info_string");
736 DwarfStrOffSection = Ctx->getCOFFSection(
737 ".debug_str_offsets",
738 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
739 COFF::IMAGE_SCN_MEM_READ,
740 SectionKind::getMetadata(), "section_str_off");
741 DwarfLocSection = Ctx->getCOFFSection(
742 ".debug_loc",
743 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
744 COFF::IMAGE_SCN_MEM_READ,
745 SectionKind::getMetadata(), "section_debug_loc");
746 DwarfARangesSection = Ctx->getCOFFSection(
747 ".debug_aranges",
748 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
749 COFF::IMAGE_SCN_MEM_READ,
750 SectionKind::getMetadata());
751 DwarfRangesSection = Ctx->getCOFFSection(
752 ".debug_ranges",
753 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
754 COFF::IMAGE_SCN_MEM_READ,
755 SectionKind::getMetadata(), "debug_range");
756 DwarfMacinfoSection = Ctx->getCOFFSection(
757 ".debug_macinfo",
758 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
759 COFF::IMAGE_SCN_MEM_READ,
760 SectionKind::getMetadata(), "debug_macinfo");
761 DwarfInfoDWOSection = Ctx->getCOFFSection(
762 ".debug_info.dwo",
763 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
764 COFF::IMAGE_SCN_MEM_READ,
765 SectionKind::getMetadata(), "section_info_dwo");
766 DwarfTypesDWOSection = Ctx->getCOFFSection(
767 ".debug_types.dwo",
768 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
769 COFF::IMAGE_SCN_MEM_READ,
770 SectionKind::getMetadata(), "section_types_dwo");
771 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
772 ".debug_abbrev.dwo",
773 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
774 COFF::IMAGE_SCN_MEM_READ,
775 SectionKind::getMetadata(), "section_abbrev_dwo");
776 DwarfStrDWOSection = Ctx->getCOFFSection(
777 ".debug_str.dwo",
778 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
779 COFF::IMAGE_SCN_MEM_READ,
780 SectionKind::getMetadata(), "skel_string");
781 DwarfLineDWOSection = Ctx->getCOFFSection(
782 ".debug_line.dwo",
783 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
784 COFF::IMAGE_SCN_MEM_READ,
785 SectionKind::getMetadata());
786 DwarfLocDWOSection = Ctx->getCOFFSection(
787 ".debug_loc.dwo",
788 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
789 COFF::IMAGE_SCN_MEM_READ,
790 SectionKind::getMetadata(), "skel_loc");
791 DwarfStrOffDWOSection = Ctx->getCOFFSection(
792 ".debug_str_offsets.dwo",
793 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
794 COFF::IMAGE_SCN_MEM_READ,
795 SectionKind::getMetadata(), "section_str_off_dwo");
796 DwarfAddrSection = Ctx->getCOFFSection(
797 ".debug_addr",
798 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
799 COFF::IMAGE_SCN_MEM_READ,
800 SectionKind::getMetadata(), "addr_sec");
801 DwarfCUIndexSection = Ctx->getCOFFSection(
802 ".debug_cu_index",
803 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
804 COFF::IMAGE_SCN_MEM_READ,
805 SectionKind::getMetadata());
806 DwarfTUIndexSection = Ctx->getCOFFSection(
807 ".debug_tu_index",
808 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
809 COFF::IMAGE_SCN_MEM_READ,
810 SectionKind::getMetadata());
811 DwarfDebugNamesSection = Ctx->getCOFFSection(
812 ".debug_names",
813 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
814 COFF::IMAGE_SCN_MEM_READ,
815 SectionKind::getMetadata(), "debug_names_begin");
816 DwarfAccelNamesSection = Ctx->getCOFFSection(
817 ".apple_names",
818 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
819 COFF::IMAGE_SCN_MEM_READ,
820 SectionKind::getMetadata(), "names_begin");
821 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
822 ".apple_namespaces",
823 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
824 COFF::IMAGE_SCN_MEM_READ,
825 SectionKind::getMetadata(), "namespac_begin");
826 DwarfAccelTypesSection = Ctx->getCOFFSection(
827 ".apple_types",
828 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
829 COFF::IMAGE_SCN_MEM_READ,
830 SectionKind::getMetadata(), "types_begin");
831 DwarfAccelObjCSection = Ctx->getCOFFSection(
832 ".apple_objc",
833 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
834 COFF::IMAGE_SCN_MEM_READ,
835 SectionKind::getMetadata(), "objc_begin");
836
837 DrectveSection = Ctx->getCOFFSection(
838 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
839 SectionKind::getMetadata());
840
841 PDataSection = Ctx->getCOFFSection(
842 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
843 SectionKind::getData());
844
845 XDataSection = Ctx->getCOFFSection(
846 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
847 SectionKind::getData());
848
849 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
850 SectionKind::getMetadata());
851
852 GFIDsSection = Ctx->getCOFFSection(".gfids$y",
853 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
854 COFF::IMAGE_SCN_MEM_READ,
855 SectionKind::getMetadata());
856
857 TLSDataSection = Ctx->getCOFFSection(
858 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
859 COFF::IMAGE_SCN_MEM_WRITE,
860 SectionKind::getData());
861
862 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
863 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
864 COFF::IMAGE_SCN_MEM_READ,
865 SectionKind::getReadOnly());
866 }
867
initWasmMCObjectFileInfo(const Triple & T)868 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) {
869 TextSection = Ctx->getWasmSection(".text", SectionKind::getText());
870 DataSection = Ctx->getWasmSection(".data", SectionKind::getData());
871
872 DwarfLineSection =
873 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata());
874 DwarfLineStrSection =
875 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata());
876 DwarfStrSection =
877 Ctx->getWasmSection(".debug_str", SectionKind::getMetadata());
878 DwarfLocSection =
879 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata());
880 DwarfAbbrevSection =
881 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata());
882 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata());
883 DwarfRangesSection =
884 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata());
885 DwarfMacinfoSection =
886 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata());
887 DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata());
888 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata());
889 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata());
890 DwarfInfoSection =
891 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata());
892 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata());
893 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata());
894 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata());
895
896 // TODO: Define more sections.
897 }
898
InitMCObjectFileInfo(const Triple & TheTriple,bool PIC,MCContext & ctx,bool LargeCodeModel)899 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
900 MCContext &ctx,
901 bool LargeCodeModel) {
902 PositionIndependent = PIC;
903 Ctx = &ctx;
904
905 // Common.
906 CommDirectiveSupportsAlignment = true;
907 SupportsWeakOmittedEHFrame = true;
908 SupportsCompactUnwindWithoutEHFrame = false;
909 OmitDwarfIfHaveCompactUnwind = false;
910
911 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
912 dwarf::DW_EH_PE_absptr;
913
914 CompactUnwindDwarfEHFrameOnly = 0;
915
916 EHFrameSection = nullptr; // Created on demand.
917 CompactUnwindSection = nullptr; // Used only by selected targets.
918 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
919 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
920 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
921 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
922
923 TT = TheTriple;
924
925 switch (TT.getObjectFormat()) {
926 case Triple::MachO:
927 Env = IsMachO;
928 initMachOMCObjectFileInfo(TT);
929 break;
930 case Triple::COFF:
931 if (!TT.isOSWindows())
932 report_fatal_error(
933 "Cannot initialize MC for non-Windows COFF object files.");
934
935 Env = IsCOFF;
936 initCOFFMCObjectFileInfo(TT);
937 break;
938 case Triple::ELF:
939 Env = IsELF;
940 initELFMCObjectFileInfo(TT, LargeCodeModel);
941 break;
942 case Triple::Wasm:
943 Env = IsWasm;
944 initWasmMCObjectFileInfo(TT);
945 break;
946 case Triple::UnknownObjectFormat:
947 report_fatal_error("Cannot initialize MC for unknown object file format.");
948 break;
949 }
950 }
951
getDwarfTypesSection(uint64_t Hash) const952 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
953 switch (TT.getObjectFormat()) {
954 case Triple::ELF:
955 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
956 0, utostr(Hash));
957 case Triple::MachO:
958 case Triple::COFF:
959 case Triple::Wasm:
960 case Triple::UnknownObjectFormat:
961 report_fatal_error("Cannot get DWARF types section for this object file "
962 "format: not implemented.");
963 break;
964 }
965 llvm_unreachable("Unknown ObjectFormatType");
966 }
967
968 MCSection *
getStackSizesSection(const MCSection & TextSec) const969 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const {
970 if (Env != IsELF)
971 return StackSizesSection;
972
973 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
974 unsigned Flags = ELF::SHF_LINK_ORDER;
975 StringRef GroupName;
976 if (const MCSymbol *Group = ElfSec.getGroup()) {
977 GroupName = Group->getName();
978 Flags |= ELF::SHF_GROUP;
979 }
980
981 const MCSymbol *Link = TextSec.getBeginSymbol();
982 auto It = StackSizesUniquing.insert({Link, StackSizesUniquing.size()});
983 unsigned UniqueID = It.first->second;
984
985 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0,
986 GroupName, UniqueID, cast<MCSymbolELF>(Link));
987 }
988