1 //===-- MCObjectFileInfo.cpp - Object File Information --------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "llvm/MC/MCObjectFileInfo.h"
10 #include "llvm/ADT/StringExtras.h"
11 #include "llvm/ADT/Triple.h"
12 #include "llvm/BinaryFormat/COFF.h"
13 #include "llvm/BinaryFormat/ELF.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCSection.h"
17 #include "llvm/MC/MCSectionCOFF.h"
18 #include "llvm/MC/MCSectionELF.h"
19 #include "llvm/MC/MCSectionMachO.h"
20 #include "llvm/MC/MCSectionWasm.h"
21 #include "llvm/MC/MCSectionXCOFF.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 || T.getArch() == Triple::aarch64_32)
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() && T.isX86())
44 return true;
45
46 return false;
47 }
48
initMachOMCObjectFileInfo(const Triple & T)49 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
50 // MachO
51 SupportsWeakOmittedEHFrame = false;
52
53 EHFrameSection = Ctx->getMachOSection(
54 "__TEXT", "__eh_frame",
55 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
56 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
57 SectionKind::getReadOnly());
58
59 if (T.isOSDarwin() &&
60 (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32))
61 SupportsCompactUnwindWithoutEHFrame = true;
62
63 if (T.isWatchABI())
64 OmitDwarfIfHaveCompactUnwind = true;
65
66 FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
67
68 // .comm doesn't support alignment before Leopard.
69 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
70 CommDirectiveSupportsAlignment = false;
71
72 TextSection // .text
73 = Ctx->getMachOSection("__TEXT", "__text",
74 MachO::S_ATTR_PURE_INSTRUCTIONS,
75 SectionKind::getText());
76 DataSection // .data
77 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData());
78
79 // BSSSection might not be expected initialized on msvc.
80 BSSSection = nullptr;
81
82 TLSDataSection // .tdata
83 = Ctx->getMachOSection("__DATA", "__thread_data",
84 MachO::S_THREAD_LOCAL_REGULAR,
85 SectionKind::getData());
86 TLSBSSSection // .tbss
87 = Ctx->getMachOSection("__DATA", "__thread_bss",
88 MachO::S_THREAD_LOCAL_ZEROFILL,
89 SectionKind::getThreadBSS());
90
91 // TODO: Verify datarel below.
92 TLSTLVSection // .tlv
93 = Ctx->getMachOSection("__DATA", "__thread_vars",
94 MachO::S_THREAD_LOCAL_VARIABLES,
95 SectionKind::getData());
96
97 TLSThreadInitSection = Ctx->getMachOSection(
98 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
99 SectionKind::getData());
100
101 CStringSection // .cstring
102 = Ctx->getMachOSection("__TEXT", "__cstring",
103 MachO::S_CSTRING_LITERALS,
104 SectionKind::getMergeable1ByteCString());
105 UStringSection
106 = Ctx->getMachOSection("__TEXT","__ustring", 0,
107 SectionKind::getMergeable2ByteCString());
108 FourByteConstantSection // .literal4
109 = Ctx->getMachOSection("__TEXT", "__literal4",
110 MachO::S_4BYTE_LITERALS,
111 SectionKind::getMergeableConst4());
112 EightByteConstantSection // .literal8
113 = Ctx->getMachOSection("__TEXT", "__literal8",
114 MachO::S_8BYTE_LITERALS,
115 SectionKind::getMergeableConst8());
116
117 SixteenByteConstantSection // .literal16
118 = Ctx->getMachOSection("__TEXT", "__literal16",
119 MachO::S_16BYTE_LITERALS,
120 SectionKind::getMergeableConst16());
121
122 ReadOnlySection // .const
123 = Ctx->getMachOSection("__TEXT", "__const", 0,
124 SectionKind::getReadOnly());
125
126 // If the target is not powerpc, map the coal sections to the non-coal
127 // sections.
128 //
129 // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
130 // "__TEXT/__const_coal" => section "__TEXT/__const"
131 // "__DATA/__datacoal_nt" => section "__DATA/__data"
132 Triple::ArchType ArchTy = T.getArch();
133
134 ConstDataSection // .const_data
135 = Ctx->getMachOSection("__DATA", "__const", 0,
136 SectionKind::getReadOnlyWithRel());
137
138 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
139 TextCoalSection
140 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
141 MachO::S_COALESCED |
142 MachO::S_ATTR_PURE_INSTRUCTIONS,
143 SectionKind::getText());
144 ConstTextCoalSection
145 = Ctx->getMachOSection("__TEXT", "__const_coal",
146 MachO::S_COALESCED,
147 SectionKind::getReadOnly());
148 DataCoalSection = Ctx->getMachOSection(
149 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
150 ConstDataCoalSection = DataCoalSection;
151 } else {
152 TextCoalSection = TextSection;
153 ConstTextCoalSection = ReadOnlySection;
154 DataCoalSection = DataSection;
155 ConstDataCoalSection = ConstDataSection;
156 }
157
158 DataCommonSection
159 = Ctx->getMachOSection("__DATA","__common",
160 MachO::S_ZEROFILL,
161 SectionKind::getBSS());
162 DataBSSSection
163 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
164 SectionKind::getBSS());
165
166
167 LazySymbolPointerSection
168 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
169 MachO::S_LAZY_SYMBOL_POINTERS,
170 SectionKind::getMetadata());
171 NonLazySymbolPointerSection
172 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
173 MachO::S_NON_LAZY_SYMBOL_POINTERS,
174 SectionKind::getMetadata());
175
176 ThreadLocalPointerSection
177 = Ctx->getMachOSection("__DATA", "__thread_ptr",
178 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
179 SectionKind::getMetadata());
180
181 // Exception Handling.
182 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
183 SectionKind::getReadOnlyWithRel());
184
185 COFFDebugSymbolsSection = nullptr;
186 COFFDebugTypesSection = nullptr;
187 COFFGlobalTypeHashesSection = nullptr;
188
189 if (useCompactUnwind(T)) {
190 CompactUnwindSection =
191 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
192 SectionKind::getReadOnly());
193
194 if (T.isX86())
195 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF
196 else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32)
197 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF
198 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
199 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF
200 }
201
202 // Debug Information.
203 DwarfDebugNamesSection =
204 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG,
205 SectionKind::getMetadata(), "debug_names_begin");
206 DwarfAccelNamesSection =
207 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
208 SectionKind::getMetadata(), "names_begin");
209 DwarfAccelObjCSection =
210 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
211 SectionKind::getMetadata(), "objc_begin");
212 // 16 character section limit...
213 DwarfAccelNamespaceSection =
214 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
215 SectionKind::getMetadata(), "namespac_begin");
216 DwarfAccelTypesSection =
217 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
218 SectionKind::getMetadata(), "types_begin");
219
220 DwarfSwiftASTSection =
221 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG,
222 SectionKind::getMetadata());
223
224 DwarfAbbrevSection =
225 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
226 SectionKind::getMetadata(), "section_abbrev");
227 DwarfInfoSection =
228 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
229 SectionKind::getMetadata(), "section_info");
230 DwarfLineSection =
231 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
232 SectionKind::getMetadata(), "section_line");
233 DwarfLineStrSection =
234 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG,
235 SectionKind::getMetadata(), "section_line_str");
236 DwarfFrameSection =
237 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
238 SectionKind::getMetadata());
239 DwarfPubNamesSection =
240 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
241 SectionKind::getMetadata());
242 DwarfPubTypesSection =
243 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
244 SectionKind::getMetadata());
245 DwarfGnuPubNamesSection =
246 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
247 SectionKind::getMetadata());
248 DwarfGnuPubTypesSection =
249 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
250 SectionKind::getMetadata());
251 DwarfStrSection =
252 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
253 SectionKind::getMetadata(), "info_string");
254 DwarfStrOffSection =
255 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG,
256 SectionKind::getMetadata(), "section_str_off");
257 DwarfAddrSection =
258 Ctx->getMachOSection("__DWARF", "__debug_addr", MachO::S_ATTR_DEBUG,
259 SectionKind::getMetadata(), "section_info");
260 DwarfLocSection =
261 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
262 SectionKind::getMetadata(), "section_debug_loc");
263 DwarfLoclistsSection =
264 Ctx->getMachOSection("__DWARF", "__debug_loclists", MachO::S_ATTR_DEBUG,
265 SectionKind::getMetadata(), "section_debug_loc");
266
267 DwarfARangesSection =
268 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
269 SectionKind::getMetadata());
270 DwarfRangesSection =
271 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
272 SectionKind::getMetadata(), "debug_range");
273 DwarfRnglistsSection =
274 Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG,
275 SectionKind::getMetadata(), "debug_range");
276 DwarfMacinfoSection =
277 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
278 SectionKind::getMetadata(), "debug_macinfo");
279 DwarfMacroSection =
280 Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG,
281 SectionKind::getMetadata(), "debug_macro");
282 DwarfDebugInlineSection =
283 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
284 SectionKind::getMetadata());
285 DwarfCUIndexSection =
286 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
287 SectionKind::getMetadata());
288 DwarfTUIndexSection =
289 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
290 SectionKind::getMetadata());
291 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
292 0, SectionKind::getMetadata());
293
294 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
295 0, SectionKind::getMetadata());
296
297 RemarksSection = Ctx->getMachOSection(
298 "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata());
299
300 TLSExtraDataSection = TLSTLVSection;
301 }
302
initELFMCObjectFileInfo(const Triple & T,bool Large)303 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
304 switch (T.getArch()) {
305 case Triple::mips:
306 case Triple::mipsel:
307 case Triple::mips64:
308 case Triple::mips64el:
309 // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case
310 // since there is no R_MIPS_PC64 relocation (only a 32-bit version).
311 if (PositionIndependent && !Large)
312 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
313 else
314 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4
315 ? dwarf::DW_EH_PE_sdata4
316 : dwarf::DW_EH_PE_sdata8;
317 break;
318 case Triple::ppc64:
319 case Triple::ppc64le:
320 case Triple::aarch64:
321 case Triple::aarch64_be:
322 case Triple::x86_64:
323 FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
324 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
325 break;
326 case Triple::bpfel:
327 case Triple::bpfeb:
328 FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
329 break;
330 case Triple::hexagon:
331 FDECFIEncoding =
332 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr;
333 break;
334 default:
335 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
336 break;
337 }
338
339 unsigned EHSectionType = T.getArch() == Triple::x86_64
340 ? ELF::SHT_X86_64_UNWIND
341 : ELF::SHT_PROGBITS;
342
343 // Solaris requires different flags for .eh_frame to seemingly every other
344 // platform.
345 unsigned EHSectionFlags = ELF::SHF_ALLOC;
346 if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
347 EHSectionFlags |= ELF::SHF_WRITE;
348
349 // ELF
350 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
351 ELF::SHF_WRITE | ELF::SHF_ALLOC);
352
353 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
354 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
355
356 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
357 ELF::SHF_WRITE | ELF::SHF_ALLOC);
358
359 ReadOnlySection =
360 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
361
362 TLSDataSection =
363 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
364 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
365
366 TLSBSSSection = Ctx->getELFSection(
367 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
368
369 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
370 ELF::SHF_ALLOC | ELF::SHF_WRITE);
371
372 MergeableConst4Section =
373 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
374 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
375
376 MergeableConst8Section =
377 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
378 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
379
380 MergeableConst16Section =
381 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
382 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
383
384 MergeableConst32Section =
385 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
386 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
387
388 // Exception Handling Sections.
389
390 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
391 // it contains relocatable pointers. In PIC mode, this is probably a big
392 // runtime hit for C++ apps. Either the contents of the LSDA need to be
393 // adjusted or this should be a data section.
394 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
395 ELF::SHF_ALLOC);
396
397 COFFDebugSymbolsSection = nullptr;
398 COFFDebugTypesSection = nullptr;
399
400 unsigned DebugSecType = ELF::SHT_PROGBITS;
401
402 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type
403 // to distinguish among sections contain DWARF and ECOFF debug formats.
404 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS.
405 if (T.isMIPS())
406 DebugSecType = ELF::SHT_MIPS_DWARF;
407
408 // Debug Info Sections.
409 DwarfAbbrevSection =
410 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0);
411 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0);
412 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0);
413 DwarfLineStrSection =
414 Ctx->getELFSection(".debug_line_str", DebugSecType,
415 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
416 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0);
417 DwarfPubNamesSection =
418 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0);
419 DwarfPubTypesSection =
420 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0);
421 DwarfGnuPubNamesSection =
422 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0);
423 DwarfGnuPubTypesSection =
424 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0);
425 DwarfStrSection =
426 Ctx->getELFSection(".debug_str", DebugSecType,
427 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
428 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0);
429 DwarfARangesSection =
430 Ctx->getELFSection(".debug_aranges", DebugSecType, 0);
431 DwarfRangesSection =
432 Ctx->getELFSection(".debug_ranges", DebugSecType, 0);
433 DwarfMacinfoSection =
434 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0);
435 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0);
436
437 // DWARF5 Experimental Debug Info
438
439 // Accelerator Tables
440 DwarfDebugNamesSection =
441 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0);
442 DwarfAccelNamesSection =
443 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0);
444 DwarfAccelObjCSection =
445 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0);
446 DwarfAccelNamespaceSection =
447 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0);
448 DwarfAccelTypesSection =
449 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0);
450
451 // String Offset and Address Sections
452 DwarfStrOffSection =
453 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0);
454 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0);
455 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0);
456 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0);
457
458 // Fission Sections
459 DwarfInfoDWOSection =
460 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE);
461 DwarfTypesDWOSection =
462 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE);
463 DwarfAbbrevDWOSection =
464 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE);
465 DwarfStrDWOSection = Ctx->getELFSection(
466 ".debug_str.dwo", DebugSecType,
467 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1, "");
468 DwarfLineDWOSection =
469 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE);
470 DwarfLocDWOSection =
471 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE);
472 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo",
473 DebugSecType, ELF::SHF_EXCLUDE);
474 DwarfRnglistsDWOSection =
475 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE);
476 DwarfMacinfoDWOSection =
477 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE);
478 DwarfMacroDWOSection =
479 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE);
480
481 DwarfLoclistsDWOSection =
482 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE);
483
484 // DWP Sections
485 DwarfCUIndexSection =
486 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0);
487 DwarfTUIndexSection =
488 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0);
489
490 StackMapSection =
491 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
492
493 FaultMapSection =
494 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
495
496 EHFrameSection =
497 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
498
499 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0);
500 }
501
initCOFFMCObjectFileInfo(const Triple & T)502 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
503 EHFrameSection =
504 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
505 COFF::IMAGE_SCN_MEM_READ,
506 SectionKind::getData());
507
508 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is
509 // used to indicate to the linker that the text segment contains thumb instructions
510 // and to set the ISA selection bit for calls accordingly.
511 const bool IsThumb = T.getArch() == Triple::thumb;
512
513 CommDirectiveSupportsAlignment = true;
514
515 // COFF
516 BSSSection = Ctx->getCOFFSection(
517 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
518 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
519 SectionKind::getBSS());
520 TextSection = Ctx->getCOFFSection(
521 ".text",
522 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
523 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
524 COFF::IMAGE_SCN_MEM_READ,
525 SectionKind::getText());
526 DataSection = Ctx->getCOFFSection(
527 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
528 COFF::IMAGE_SCN_MEM_WRITE,
529 SectionKind::getData());
530 ReadOnlySection = Ctx->getCOFFSection(
531 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
532 SectionKind::getReadOnly());
533
534 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64) {
535 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
536 LSDASection = nullptr;
537 } else {
538 LSDASection = Ctx->getCOFFSection(".gcc_except_table",
539 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
540 COFF::IMAGE_SCN_MEM_READ,
541 SectionKind::getReadOnly());
542 }
543
544 // Debug info.
545 COFFDebugSymbolsSection =
546 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
547 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
548 COFF::IMAGE_SCN_MEM_READ),
549 SectionKind::getMetadata());
550 COFFDebugTypesSection =
551 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
552 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
553 COFF::IMAGE_SCN_MEM_READ),
554 SectionKind::getMetadata());
555 COFFGlobalTypeHashesSection = Ctx->getCOFFSection(
556 ".debug$H",
557 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
558 COFF::IMAGE_SCN_MEM_READ),
559 SectionKind::getMetadata());
560
561 DwarfAbbrevSection = Ctx->getCOFFSection(
562 ".debug_abbrev",
563 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
564 COFF::IMAGE_SCN_MEM_READ,
565 SectionKind::getMetadata(), "section_abbrev");
566 DwarfInfoSection = Ctx->getCOFFSection(
567 ".debug_info",
568 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
569 COFF::IMAGE_SCN_MEM_READ,
570 SectionKind::getMetadata(), "section_info");
571 DwarfLineSection = Ctx->getCOFFSection(
572 ".debug_line",
573 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
574 COFF::IMAGE_SCN_MEM_READ,
575 SectionKind::getMetadata(), "section_line");
576 DwarfLineStrSection = Ctx->getCOFFSection(
577 ".debug_line_str",
578 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
579 COFF::IMAGE_SCN_MEM_READ,
580 SectionKind::getMetadata(), "section_line_str");
581 DwarfFrameSection = Ctx->getCOFFSection(
582 ".debug_frame",
583 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
584 COFF::IMAGE_SCN_MEM_READ,
585 SectionKind::getMetadata());
586 DwarfPubNamesSection = Ctx->getCOFFSection(
587 ".debug_pubnames",
588 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
589 COFF::IMAGE_SCN_MEM_READ,
590 SectionKind::getMetadata());
591 DwarfPubTypesSection = Ctx->getCOFFSection(
592 ".debug_pubtypes",
593 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
594 COFF::IMAGE_SCN_MEM_READ,
595 SectionKind::getMetadata());
596 DwarfGnuPubNamesSection = Ctx->getCOFFSection(
597 ".debug_gnu_pubnames",
598 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
599 COFF::IMAGE_SCN_MEM_READ,
600 SectionKind::getMetadata());
601 DwarfGnuPubTypesSection = Ctx->getCOFFSection(
602 ".debug_gnu_pubtypes",
603 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
604 COFF::IMAGE_SCN_MEM_READ,
605 SectionKind::getMetadata());
606 DwarfStrSection = Ctx->getCOFFSection(
607 ".debug_str",
608 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
609 COFF::IMAGE_SCN_MEM_READ,
610 SectionKind::getMetadata(), "info_string");
611 DwarfStrOffSection = Ctx->getCOFFSection(
612 ".debug_str_offsets",
613 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
614 COFF::IMAGE_SCN_MEM_READ,
615 SectionKind::getMetadata(), "section_str_off");
616 DwarfLocSection = Ctx->getCOFFSection(
617 ".debug_loc",
618 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
619 COFF::IMAGE_SCN_MEM_READ,
620 SectionKind::getMetadata(), "section_debug_loc");
621 DwarfLoclistsSection = Ctx->getCOFFSection(
622 ".debug_loclists",
623 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
624 COFF::IMAGE_SCN_MEM_READ,
625 SectionKind::getMetadata(), "section_debug_loclists");
626 DwarfARangesSection = Ctx->getCOFFSection(
627 ".debug_aranges",
628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
629 COFF::IMAGE_SCN_MEM_READ,
630 SectionKind::getMetadata());
631 DwarfRangesSection = Ctx->getCOFFSection(
632 ".debug_ranges",
633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
634 COFF::IMAGE_SCN_MEM_READ,
635 SectionKind::getMetadata(), "debug_range");
636 DwarfRnglistsSection = Ctx->getCOFFSection(
637 ".debug_rnglists",
638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
639 COFF::IMAGE_SCN_MEM_READ,
640 SectionKind::getMetadata(), "debug_rnglists");
641 DwarfMacinfoSection = Ctx->getCOFFSection(
642 ".debug_macinfo",
643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
644 COFF::IMAGE_SCN_MEM_READ,
645 SectionKind::getMetadata(), "debug_macinfo");
646 DwarfMacroSection = Ctx->getCOFFSection(
647 ".debug_macro",
648 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
649 COFF::IMAGE_SCN_MEM_READ,
650 SectionKind::getMetadata(), "debug_macro");
651 DwarfMacinfoDWOSection = Ctx->getCOFFSection(
652 ".debug_macinfo.dwo",
653 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
654 COFF::IMAGE_SCN_MEM_READ,
655 SectionKind::getMetadata(), "debug_macinfo.dwo");
656 DwarfMacroDWOSection = Ctx->getCOFFSection(
657 ".debug_macro.dwo",
658 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
659 COFF::IMAGE_SCN_MEM_READ,
660 SectionKind::getMetadata(), "debug_macro.dwo");
661 DwarfInfoDWOSection = Ctx->getCOFFSection(
662 ".debug_info.dwo",
663 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
664 COFF::IMAGE_SCN_MEM_READ,
665 SectionKind::getMetadata(), "section_info_dwo");
666 DwarfTypesDWOSection = Ctx->getCOFFSection(
667 ".debug_types.dwo",
668 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
669 COFF::IMAGE_SCN_MEM_READ,
670 SectionKind::getMetadata(), "section_types_dwo");
671 DwarfAbbrevDWOSection = Ctx->getCOFFSection(
672 ".debug_abbrev.dwo",
673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
674 COFF::IMAGE_SCN_MEM_READ,
675 SectionKind::getMetadata(), "section_abbrev_dwo");
676 DwarfStrDWOSection = Ctx->getCOFFSection(
677 ".debug_str.dwo",
678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
679 COFF::IMAGE_SCN_MEM_READ,
680 SectionKind::getMetadata(), "skel_string");
681 DwarfLineDWOSection = Ctx->getCOFFSection(
682 ".debug_line.dwo",
683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
684 COFF::IMAGE_SCN_MEM_READ,
685 SectionKind::getMetadata());
686 DwarfLocDWOSection = Ctx->getCOFFSection(
687 ".debug_loc.dwo",
688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
689 COFF::IMAGE_SCN_MEM_READ,
690 SectionKind::getMetadata(), "skel_loc");
691 DwarfStrOffDWOSection = Ctx->getCOFFSection(
692 ".debug_str_offsets.dwo",
693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
694 COFF::IMAGE_SCN_MEM_READ,
695 SectionKind::getMetadata(), "section_str_off_dwo");
696 DwarfAddrSection = Ctx->getCOFFSection(
697 ".debug_addr",
698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
699 COFF::IMAGE_SCN_MEM_READ,
700 SectionKind::getMetadata(), "addr_sec");
701 DwarfCUIndexSection = Ctx->getCOFFSection(
702 ".debug_cu_index",
703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
704 COFF::IMAGE_SCN_MEM_READ,
705 SectionKind::getMetadata());
706 DwarfTUIndexSection = Ctx->getCOFFSection(
707 ".debug_tu_index",
708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
709 COFF::IMAGE_SCN_MEM_READ,
710 SectionKind::getMetadata());
711 DwarfDebugNamesSection = Ctx->getCOFFSection(
712 ".debug_names",
713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
714 COFF::IMAGE_SCN_MEM_READ,
715 SectionKind::getMetadata(), "debug_names_begin");
716 DwarfAccelNamesSection = Ctx->getCOFFSection(
717 ".apple_names",
718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
719 COFF::IMAGE_SCN_MEM_READ,
720 SectionKind::getMetadata(), "names_begin");
721 DwarfAccelNamespaceSection = Ctx->getCOFFSection(
722 ".apple_namespaces",
723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
724 COFF::IMAGE_SCN_MEM_READ,
725 SectionKind::getMetadata(), "namespac_begin");
726 DwarfAccelTypesSection = Ctx->getCOFFSection(
727 ".apple_types",
728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
729 COFF::IMAGE_SCN_MEM_READ,
730 SectionKind::getMetadata(), "types_begin");
731 DwarfAccelObjCSection = Ctx->getCOFFSection(
732 ".apple_objc",
733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
734 COFF::IMAGE_SCN_MEM_READ,
735 SectionKind::getMetadata(), "objc_begin");
736
737 DrectveSection = Ctx->getCOFFSection(
738 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
739 SectionKind::getMetadata());
740
741 PDataSection = Ctx->getCOFFSection(
742 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
743 SectionKind::getData());
744
745 XDataSection = Ctx->getCOFFSection(
746 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
747 SectionKind::getData());
748
749 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
750 SectionKind::getMetadata());
751
752 GFIDsSection = Ctx->getCOFFSection(".gfids$y",
753 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
754 COFF::IMAGE_SCN_MEM_READ,
755 SectionKind::getMetadata());
756
757 GIATsSection = Ctx->getCOFFSection(".giats$y",
758 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
759 COFF::IMAGE_SCN_MEM_READ,
760 SectionKind::getMetadata());
761
762 GLJMPSection = Ctx->getCOFFSection(".gljmp$y",
763 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
764 COFF::IMAGE_SCN_MEM_READ,
765 SectionKind::getMetadata());
766
767 TLSDataSection = Ctx->getCOFFSection(
768 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
769 COFF::IMAGE_SCN_MEM_WRITE,
770 SectionKind::getData());
771
772 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
773 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
774 COFF::IMAGE_SCN_MEM_READ,
775 SectionKind::getReadOnly());
776 }
777
initWasmMCObjectFileInfo(const Triple & T)778 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) {
779 TextSection = Ctx->getWasmSection(".text", SectionKind::getText());
780 DataSection = Ctx->getWasmSection(".data", SectionKind::getData());
781
782 DwarfLineSection =
783 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata());
784 DwarfLineStrSection =
785 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata());
786 DwarfStrSection =
787 Ctx->getWasmSection(".debug_str", SectionKind::getMetadata());
788 DwarfLocSection =
789 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata());
790 DwarfAbbrevSection =
791 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata());
792 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata());
793 DwarfRangesSection =
794 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata());
795 DwarfMacinfoSection =
796 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata());
797 DwarfMacroSection =
798 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata());
799 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata());
800 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata());
801 DwarfInfoSection =
802 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata());
803 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata());
804 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata());
805 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata());
806 DwarfGnuPubNamesSection =
807 Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata());
808 DwarfGnuPubTypesSection =
809 Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata());
810
811 DwarfDebugNamesSection =
812 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata());
813 DwarfStrOffSection =
814 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata());
815 DwarfAddrSection =
816 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata());
817 DwarfRnglistsSection =
818 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata());
819 DwarfLoclistsSection =
820 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata());
821
822 // Fission Sections
823 DwarfInfoDWOSection =
824 Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata());
825 DwarfTypesDWOSection =
826 Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata());
827 DwarfAbbrevDWOSection =
828 Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata());
829 DwarfStrDWOSection =
830 Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata());
831 DwarfLineDWOSection =
832 Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata());
833 DwarfLocDWOSection =
834 Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata());
835 DwarfStrOffDWOSection =
836 Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata());
837 DwarfRnglistsDWOSection =
838 Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata());
839 DwarfMacinfoDWOSection =
840 Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata());
841 DwarfMacroDWOSection =
842 Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata());
843
844 DwarfLoclistsDWOSection =
845 Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata());
846
847 // DWP Sections
848 DwarfCUIndexSection =
849 Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata(), 0);
850 DwarfTUIndexSection =
851 Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata(), 0);
852
853 // Wasm use data section for LSDA.
854 // TODO Consider putting each function's exception table in a separate
855 // section, as in -function-sections, to facilitate lld's --gc-section.
856 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table",
857 SectionKind::getReadOnlyWithRel());
858
859 // TODO: Define more sections.
860 }
861
initXCOFFMCObjectFileInfo(const Triple & T)862 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) {
863 // The default csect for program code. Functions without a specified section
864 // get placed into this csect. The choice of csect name is not a property of
865 // the ABI or object file format. For example, the XL compiler uses an unnamed
866 // csect for program code.
867 TextSection = Ctx->getXCOFFSection(
868 ".text", XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD,
869 SectionKind::getText(), /* MultiSymbolsAllowed*/ true);
870
871 DataSection = Ctx->getXCOFFSection(
872 ".data", XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD,
873 SectionKind::getData(), /* MultiSymbolsAllowed*/ true);
874
875 ReadOnlySection = Ctx->getXCOFFSection(
876 ".rodata", XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD,
877 SectionKind::getReadOnly(), /* MultiSymbolsAllowed*/ true);
878
879 TOCBaseSection =
880 Ctx->getXCOFFSection("TOC", XCOFF::StorageMappingClass::XMC_TC0,
881 XCOFF::XTY_SD, SectionKind::getData());
882
883 // The TOC-base always has 0 size, but 4 byte alignment.
884 TOCBaseSection->setAlignment(Align(4));
885
886 LSDASection = Ctx->getXCOFFSection(".gcc_except_table",
887 XCOFF::StorageMappingClass::XMC_RO,
888 XCOFF::XTY_SD, SectionKind::getReadOnly());
889
890 CompactUnwindSection =
891 Ctx->getXCOFFSection(".eh_info_table", XCOFF::StorageMappingClass::XMC_RW,
892 XCOFF::XTY_SD, SectionKind::getData());
893
894 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF
895 // sections, and the individual DWARF sections are distinguished by their
896 // section subtype.
897 // TODO: Populate the DWARF sections appropriately.
898 DwarfAbbrevSection = nullptr; // SSUBTYP_DWABREV
899 DwarfInfoSection = nullptr; // SSUBTYP_DWINFO
900 DwarfLineSection = nullptr; // SSUBTYP_DWLINE
901 DwarfFrameSection = nullptr; // SSUBTYP_DWFRAME
902 DwarfPubNamesSection = nullptr; // SSUBTYP_DWPBNMS
903 DwarfPubTypesSection = nullptr; // SSUBTYP_DWPBTYP
904 DwarfStrSection = nullptr; // SSUBTYP_DWSTR
905 DwarfLocSection = nullptr; // SSUBTYP_DWLOC
906 DwarfARangesSection = nullptr; // SSUBTYP_DWARNGE
907 DwarfRangesSection = nullptr; // SSUBTYP_DWRNGES
908 DwarfMacinfoSection = nullptr; // SSUBTYP_DWMAC
909 }
910
InitMCObjectFileInfo(const Triple & TheTriple,bool PIC,MCContext & ctx,bool LargeCodeModel)911 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
912 MCContext &ctx,
913 bool LargeCodeModel) {
914 PositionIndependent = PIC;
915 Ctx = &ctx;
916
917 // Common.
918 CommDirectiveSupportsAlignment = true;
919 SupportsWeakOmittedEHFrame = true;
920 SupportsCompactUnwindWithoutEHFrame = false;
921 OmitDwarfIfHaveCompactUnwind = false;
922
923 FDECFIEncoding = dwarf::DW_EH_PE_absptr;
924
925 CompactUnwindDwarfEHFrameOnly = 0;
926
927 EHFrameSection = nullptr; // Created on demand.
928 CompactUnwindSection = nullptr; // Used only by selected targets.
929 DwarfAccelNamesSection = nullptr; // Used only by selected targets.
930 DwarfAccelObjCSection = nullptr; // Used only by selected targets.
931 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
932 DwarfAccelTypesSection = nullptr; // Used only by selected targets.
933
934 TT = TheTriple;
935
936 switch (TT.getObjectFormat()) {
937 case Triple::MachO:
938 Env = IsMachO;
939 initMachOMCObjectFileInfo(TT);
940 break;
941 case Triple::COFF:
942 if (!TT.isOSWindows())
943 report_fatal_error(
944 "Cannot initialize MC for non-Windows COFF object files.");
945
946 Env = IsCOFF;
947 initCOFFMCObjectFileInfo(TT);
948 break;
949 case Triple::ELF:
950 Env = IsELF;
951 initELFMCObjectFileInfo(TT, LargeCodeModel);
952 break;
953 case Triple::Wasm:
954 Env = IsWasm;
955 initWasmMCObjectFileInfo(TT);
956 break;
957 case Triple::GOFF:
958 report_fatal_error("Cannot initialize MC for GOFF object file format");
959 break;
960 case Triple::XCOFF:
961 Env = IsXCOFF;
962 initXCOFFMCObjectFileInfo(TT);
963 break;
964 case Triple::UnknownObjectFormat:
965 report_fatal_error("Cannot initialize MC for unknown object file format.");
966 break;
967 }
968 }
969
getDwarfComdatSection(const char * Name,uint64_t Hash) const970 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name,
971 uint64_t Hash) const {
972 switch (TT.getObjectFormat()) {
973 case Triple::ELF:
974 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0,
975 utostr(Hash));
976 case Triple::Wasm:
977 return Ctx->getWasmSection(Name, SectionKind::getMetadata(), utostr(Hash),
978 MCContext::GenericSectionID);
979 case Triple::MachO:
980 case Triple::COFF:
981 case Triple::GOFF:
982 case Triple::XCOFF:
983 case Triple::UnknownObjectFormat:
984 report_fatal_error("Cannot get DWARF comdat section for this object file "
985 "format: not implemented.");
986 break;
987 }
988 llvm_unreachable("Unknown ObjectFormatType");
989 }
990
991 MCSection *
getStackSizesSection(const MCSection & TextSec) const992 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const {
993 if (Env != IsELF)
994 return StackSizesSection;
995
996 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
997 unsigned Flags = ELF::SHF_LINK_ORDER;
998 StringRef GroupName;
999 if (const MCSymbol *Group = ElfSec.getGroup()) {
1000 GroupName = Group->getName();
1001 Flags |= ELF::SHF_GROUP;
1002 }
1003
1004 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0,
1005 GroupName, ElfSec.getUniqueID(),
1006 cast<MCSymbolELF>(TextSec.getBeginSymbol()));
1007 }
1008
1009 MCSection *
getBBAddrMapSection(const MCSection & TextSec) const1010 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const {
1011 if (Env != IsELF)
1012 return nullptr;
1013
1014 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
1015 unsigned Flags = ELF::SHF_LINK_ORDER;
1016 StringRef GroupName;
1017 if (const MCSymbol *Group = ElfSec.getGroup()) {
1018 GroupName = Group->getName();
1019 Flags |= ELF::SHF_GROUP;
1020 }
1021
1022 // Use the text section's begin symbol and unique ID to create a separate
1023 // .llvm_bb_addr_map section associated with every unique text section.
1024 return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP,
1025 Flags, 0, GroupName, ElfSec.getUniqueID(),
1026 cast<MCSymbolELF>(TextSec.getBeginSymbol()));
1027 }
1028