1 //===-- MObjectFileInfo.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/Triple.h"
12 #include "llvm/MC/MCContext.h"
13 #include "llvm/MC/MCSection.h"
14 #include "llvm/MC/MCSectionCOFF.h"
15 #include "llvm/MC/MCSectionELF.h"
16 #include "llvm/MC/MCSectionMachO.h"
17 using namespace llvm;
18
InitMachOMCObjectFileInfo(Triple T)19 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
20 // MachO
21 IsFunctionEHFrameSymbolPrivate = false;
22 SupportsWeakOmittedEHFrame = false;
23
24 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
25 | dwarf::DW_EH_PE_sdata4;
26 LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
27 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
28 dwarf::DW_EH_PE_sdata4;
29
30 // .comm doesn't support alignment before Leopard.
31 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
32 CommDirectiveSupportsAlignment = false;
33
34 TextSection // .text
35 = Ctx->getMachOSection("__TEXT", "__text",
36 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
37 SectionKind::getText());
38 DataSection // .data
39 = Ctx->getMachOSection("__DATA", "__data", 0,
40 SectionKind::getDataRel());
41
42 TLSDataSection // .tdata
43 = Ctx->getMachOSection("__DATA", "__thread_data",
44 MCSectionMachO::S_THREAD_LOCAL_REGULAR,
45 SectionKind::getDataRel());
46 TLSBSSSection // .tbss
47 = Ctx->getMachOSection("__DATA", "__thread_bss",
48 MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
49 SectionKind::getThreadBSS());
50
51 // TODO: Verify datarel below.
52 TLSTLVSection // .tlv
53 = Ctx->getMachOSection("__DATA", "__thread_vars",
54 MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
55 SectionKind::getDataRel());
56
57 TLSThreadInitSection
58 = Ctx->getMachOSection("__DATA", "__thread_init",
59 MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
60 SectionKind::getDataRel());
61
62 CStringSection // .cstring
63 = Ctx->getMachOSection("__TEXT", "__cstring",
64 MCSectionMachO::S_CSTRING_LITERALS,
65 SectionKind::getMergeable1ByteCString());
66 UStringSection
67 = Ctx->getMachOSection("__TEXT","__ustring", 0,
68 SectionKind::getMergeable2ByteCString());
69 FourByteConstantSection // .literal4
70 = Ctx->getMachOSection("__TEXT", "__literal4",
71 MCSectionMachO::S_4BYTE_LITERALS,
72 SectionKind::getMergeableConst4());
73 EightByteConstantSection // .literal8
74 = Ctx->getMachOSection("__TEXT", "__literal8",
75 MCSectionMachO::S_8BYTE_LITERALS,
76 SectionKind::getMergeableConst8());
77
78 // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
79 // to using it in -static mode.
80 SixteenByteConstantSection = 0;
81 if (RelocM != Reloc::Static &&
82 T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64)
83 SixteenByteConstantSection = // .literal16
84 Ctx->getMachOSection("__TEXT", "__literal16",
85 MCSectionMachO::S_16BYTE_LITERALS,
86 SectionKind::getMergeableConst16());
87
88 ReadOnlySection // .const
89 = Ctx->getMachOSection("__TEXT", "__const", 0,
90 SectionKind::getReadOnly());
91
92 TextCoalSection
93 = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
94 MCSectionMachO::S_COALESCED |
95 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
96 SectionKind::getText());
97 ConstTextCoalSection
98 = Ctx->getMachOSection("__TEXT", "__const_coal",
99 MCSectionMachO::S_COALESCED,
100 SectionKind::getReadOnly());
101 ConstDataSection // .const_data
102 = Ctx->getMachOSection("__DATA", "__const", 0,
103 SectionKind::getReadOnlyWithRel());
104 DataCoalSection
105 = Ctx->getMachOSection("__DATA","__datacoal_nt",
106 MCSectionMachO::S_COALESCED,
107 SectionKind::getDataRel());
108 DataCommonSection
109 = Ctx->getMachOSection("__DATA","__common",
110 MCSectionMachO::S_ZEROFILL,
111 SectionKind::getBSS());
112 DataBSSSection
113 = Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
114 SectionKind::getBSS());
115
116
117 LazySymbolPointerSection
118 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
119 MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
120 SectionKind::getMetadata());
121 NonLazySymbolPointerSection
122 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
123 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
124 SectionKind::getMetadata());
125
126 if (RelocM == Reloc::Static) {
127 StaticCtorSection
128 = Ctx->getMachOSection("__TEXT", "__constructor", 0,
129 SectionKind::getDataRel());
130 StaticDtorSection
131 = Ctx->getMachOSection("__TEXT", "__destructor", 0,
132 SectionKind::getDataRel());
133 } else {
134 StaticCtorSection
135 = Ctx->getMachOSection("__DATA", "__mod_init_func",
136 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
137 SectionKind::getDataRel());
138 StaticDtorSection
139 = Ctx->getMachOSection("__DATA", "__mod_term_func",
140 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
141 SectionKind::getDataRel());
142 }
143
144 // Exception Handling.
145 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
146 SectionKind::getReadOnlyWithRel());
147
148 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
149 CompactUnwindSection =
150 Ctx->getMachOSection("__LD", "__compact_unwind",
151 MCSectionMachO::S_ATTR_DEBUG,
152 SectionKind::getReadOnly());
153
154 // Debug Information.
155 DwarfAccelNamesSection =
156 Ctx->getMachOSection("__DWARF", "__apple_names",
157 MCSectionMachO::S_ATTR_DEBUG,
158 SectionKind::getMetadata());
159 DwarfAccelObjCSection =
160 Ctx->getMachOSection("__DWARF", "__apple_objc",
161 MCSectionMachO::S_ATTR_DEBUG,
162 SectionKind::getMetadata());
163 // 16 character section limit...
164 DwarfAccelNamespaceSection =
165 Ctx->getMachOSection("__DWARF", "__apple_namespac",
166 MCSectionMachO::S_ATTR_DEBUG,
167 SectionKind::getMetadata());
168 DwarfAccelTypesSection =
169 Ctx->getMachOSection("__DWARF", "__apple_types",
170 MCSectionMachO::S_ATTR_DEBUG,
171 SectionKind::getMetadata());
172
173 DwarfAbbrevSection =
174 Ctx->getMachOSection("__DWARF", "__debug_abbrev",
175 MCSectionMachO::S_ATTR_DEBUG,
176 SectionKind::getMetadata());
177 DwarfInfoSection =
178 Ctx->getMachOSection("__DWARF", "__debug_info",
179 MCSectionMachO::S_ATTR_DEBUG,
180 SectionKind::getMetadata());
181 DwarfLineSection =
182 Ctx->getMachOSection("__DWARF", "__debug_line",
183 MCSectionMachO::S_ATTR_DEBUG,
184 SectionKind::getMetadata());
185 DwarfFrameSection =
186 Ctx->getMachOSection("__DWARF", "__debug_frame",
187 MCSectionMachO::S_ATTR_DEBUG,
188 SectionKind::getMetadata());
189 DwarfPubNamesSection =
190 Ctx->getMachOSection("__DWARF", "__debug_pubnames",
191 MCSectionMachO::S_ATTR_DEBUG,
192 SectionKind::getMetadata());
193 DwarfPubTypesSection =
194 Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
195 MCSectionMachO::S_ATTR_DEBUG,
196 SectionKind::getMetadata());
197 DwarfStrSection =
198 Ctx->getMachOSection("__DWARF", "__debug_str",
199 MCSectionMachO::S_ATTR_DEBUG,
200 SectionKind::getMetadata());
201 DwarfLocSection =
202 Ctx->getMachOSection("__DWARF", "__debug_loc",
203 MCSectionMachO::S_ATTR_DEBUG,
204 SectionKind::getMetadata());
205 DwarfARangesSection =
206 Ctx->getMachOSection("__DWARF", "__debug_aranges",
207 MCSectionMachO::S_ATTR_DEBUG,
208 SectionKind::getMetadata());
209 DwarfRangesSection =
210 Ctx->getMachOSection("__DWARF", "__debug_ranges",
211 MCSectionMachO::S_ATTR_DEBUG,
212 SectionKind::getMetadata());
213 DwarfMacroInfoSection =
214 Ctx->getMachOSection("__DWARF", "__debug_macinfo",
215 MCSectionMachO::S_ATTR_DEBUG,
216 SectionKind::getMetadata());
217 DwarfDebugInlineSection =
218 Ctx->getMachOSection("__DWARF", "__debug_inlined",
219 MCSectionMachO::S_ATTR_DEBUG,
220 SectionKind::getMetadata());
221
222 TLSExtraDataSection = TLSTLVSection;
223 }
224
InitELFMCObjectFileInfo(Triple T)225 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
226 // FIXME: Check this. Mips64el is using the base values, which is most likely
227 // incorrect.
228 if (T.getArch() != Triple::mips64el)
229 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
230
231 if (T.getArch() == Triple::x86) {
232 PersonalityEncoding = (RelocM == Reloc::PIC_)
233 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
234 : dwarf::DW_EH_PE_absptr;
235 LSDAEncoding = (RelocM == Reloc::PIC_)
236 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
237 : dwarf::DW_EH_PE_absptr;
238 FDEEncoding = (RelocM == Reloc::PIC_)
239 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
240 : dwarf::DW_EH_PE_absptr;
241 TTypeEncoding = (RelocM == Reloc::PIC_)
242 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
243 : dwarf::DW_EH_PE_absptr;
244 } else if (T.getArch() == Triple::x86_64) {
245 if (RelocM == Reloc::PIC_) {
246 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
247 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
248 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
249 LSDAEncoding = dwarf::DW_EH_PE_pcrel |
250 (CMModel == CodeModel::Small
251 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
252 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
253 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
254 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
255 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
256 } else {
257 PersonalityEncoding =
258 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
259 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
260 LSDAEncoding = (CMModel == CodeModel::Small)
261 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
262 FDEEncoding = dwarf::DW_EH_PE_udata4;
263 TTypeEncoding = (CMModel == CodeModel::Small)
264 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
265 }
266 } else if (T.getArch() == Triple::aarch64) {
267 // The small model guarantees static code/data size < 4GB, but not where it
268 // will be in memory. Most of these could end up >2GB away so even a signed
269 // pc-relative 32-bit address is insufficient, theoretically.
270 if (RelocM == Reloc::PIC_) {
271 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
272 dwarf::DW_EH_PE_sdata8;
273 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
274 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
275 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
276 dwarf::DW_EH_PE_sdata8;
277 } else {
278 PersonalityEncoding = dwarf::DW_EH_PE_absptr;
279 LSDAEncoding = dwarf::DW_EH_PE_absptr;
280 FDEEncoding = dwarf::DW_EH_PE_udata4;
281 TTypeEncoding = dwarf::DW_EH_PE_absptr;
282 }
283 } else if (T.getArch() == Triple::ppc64) {
284 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
285 dwarf::DW_EH_PE_udata8;
286 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
287 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
288 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
289 dwarf::DW_EH_PE_udata8;
290 }
291
292 // Solaris requires different flags for .eh_frame to seemingly every other
293 // platform.
294 EHSectionType = ELF::SHT_PROGBITS;
295 EHSectionFlags = ELF::SHF_ALLOC;
296 if (T.getOS() == Triple::Solaris) {
297 if (T.getArch() == Triple::x86_64)
298 EHSectionType = ELF::SHT_X86_64_UNWIND;
299 else
300 EHSectionFlags |= ELF::SHF_WRITE;
301 }
302
303
304 // ELF
305 BSSSection =
306 Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
307 ELF::SHF_WRITE | ELF::SHF_ALLOC,
308 SectionKind::getBSS());
309
310 TextSection =
311 Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
312 ELF::SHF_EXECINSTR |
313 ELF::SHF_ALLOC,
314 SectionKind::getText());
315
316 DataSection =
317 Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
318 ELF::SHF_WRITE |ELF::SHF_ALLOC,
319 SectionKind::getDataRel());
320
321 ReadOnlySection =
322 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
323 ELF::SHF_ALLOC,
324 SectionKind::getReadOnly());
325
326 TLSDataSection =
327 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
328 ELF::SHF_ALLOC | ELF::SHF_TLS |
329 ELF::SHF_WRITE,
330 SectionKind::getThreadData());
331
332 TLSBSSSection =
333 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
334 ELF::SHF_ALLOC | ELF::SHF_TLS |
335 ELF::SHF_WRITE,
336 SectionKind::getThreadBSS());
337
338 DataRelSection =
339 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
340 ELF::SHF_ALLOC |ELF::SHF_WRITE,
341 SectionKind::getDataRel());
342
343 DataRelLocalSection =
344 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
345 ELF::SHF_ALLOC |ELF::SHF_WRITE,
346 SectionKind::getDataRelLocal());
347
348 DataRelROSection =
349 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
350 ELF::SHF_ALLOC |ELF::SHF_WRITE,
351 SectionKind::getReadOnlyWithRel());
352
353 DataRelROLocalSection =
354 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
355 ELF::SHF_ALLOC |ELF::SHF_WRITE,
356 SectionKind::getReadOnlyWithRelLocal());
357
358 MergeableConst4Section =
359 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
360 ELF::SHF_ALLOC |ELF::SHF_MERGE,
361 SectionKind::getMergeableConst4());
362
363 MergeableConst8Section =
364 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
365 ELF::SHF_ALLOC |ELF::SHF_MERGE,
366 SectionKind::getMergeableConst8());
367
368 MergeableConst16Section =
369 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
370 ELF::SHF_ALLOC |ELF::SHF_MERGE,
371 SectionKind::getMergeableConst16());
372
373 StaticCtorSection =
374 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
375 ELF::SHF_ALLOC |ELF::SHF_WRITE,
376 SectionKind::getDataRel());
377
378 StaticDtorSection =
379 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
380 ELF::SHF_ALLOC |ELF::SHF_WRITE,
381 SectionKind::getDataRel());
382
383 // Exception Handling Sections.
384
385 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
386 // it contains relocatable pointers. In PIC mode, this is probably a big
387 // runtime hit for C++ apps. Either the contents of the LSDA need to be
388 // adjusted or this should be a data section.
389 LSDASection =
390 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
391 ELF::SHF_ALLOC,
392 SectionKind::getReadOnly());
393
394 // Debug Info Sections.
395 DwarfAbbrevSection =
396 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
397 SectionKind::getMetadata());
398 DwarfInfoSection =
399 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
400 SectionKind::getMetadata());
401 DwarfLineSection =
402 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
403 SectionKind::getMetadata());
404 DwarfFrameSection =
405 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
406 SectionKind::getMetadata());
407 DwarfPubNamesSection =
408 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
409 SectionKind::getMetadata());
410 DwarfPubTypesSection =
411 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
412 SectionKind::getMetadata());
413 DwarfStrSection =
414 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
415 ELF::SHF_MERGE | ELF::SHF_STRINGS,
416 SectionKind::getMergeable1ByteCString());
417 DwarfLocSection =
418 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
419 SectionKind::getMetadata());
420 DwarfARangesSection =
421 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
422 SectionKind::getMetadata());
423 DwarfRangesSection =
424 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
425 SectionKind::getMetadata());
426 DwarfMacroInfoSection =
427 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
428 SectionKind::getMetadata());
429
430 // DWARF5 Experimental Debug Info
431
432 // Accelerator Tables
433 DwarfAccelNamesSection =
434 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
435 SectionKind::getMetadata());
436 DwarfAccelObjCSection =
437 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
438 SectionKind::getMetadata());
439 DwarfAccelNamespaceSection =
440 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
441 SectionKind::getMetadata());
442 DwarfAccelTypesSection =
443 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
444 SectionKind::getMetadata());
445
446 // Fission Sections
447 DwarfInfoDWOSection =
448 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
449 SectionKind::getMetadata());
450 DwarfAbbrevDWOSection =
451 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
452 SectionKind::getMetadata());
453 DwarfStrDWOSection =
454 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
455 ELF::SHF_MERGE | ELF::SHF_STRINGS,
456 SectionKind::getMergeable1ByteCString());
457 DwarfLineDWOSection =
458 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
459 SectionKind::getMetadata());
460 DwarfLocDWOSection =
461 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
462 SectionKind::getMetadata());
463 DwarfStrOffDWOSection =
464 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
465 SectionKind::getMetadata());
466 DwarfAddrSection =
467 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
468 SectionKind::getMetadata());
469 }
470
471
InitCOFFMCObjectFileInfo(Triple T)472 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
473 // COFF
474 TextSection =
475 Ctx->getCOFFSection(".text",
476 COFF::IMAGE_SCN_CNT_CODE |
477 COFF::IMAGE_SCN_MEM_EXECUTE |
478 COFF::IMAGE_SCN_MEM_READ,
479 SectionKind::getText());
480 DataSection =
481 Ctx->getCOFFSection(".data",
482 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
483 COFF::IMAGE_SCN_MEM_READ |
484 COFF::IMAGE_SCN_MEM_WRITE,
485 SectionKind::getDataRel());
486 ReadOnlySection =
487 Ctx->getCOFFSection(".rdata",
488 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
489 COFF::IMAGE_SCN_MEM_READ,
490 SectionKind::getReadOnly());
491 if (T.getOS() == Triple::Win32) {
492 StaticCtorSection =
493 Ctx->getCOFFSection(".CRT$XCU",
494 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
495 COFF::IMAGE_SCN_MEM_READ,
496 SectionKind::getReadOnly());
497 } else {
498 StaticCtorSection =
499 Ctx->getCOFFSection(".ctors",
500 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
501 COFF::IMAGE_SCN_MEM_READ |
502 COFF::IMAGE_SCN_MEM_WRITE,
503 SectionKind::getDataRel());
504 }
505
506
507 if (T.getOS() == Triple::Win32) {
508 StaticDtorSection =
509 Ctx->getCOFFSection(".CRT$XTX",
510 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
511 COFF::IMAGE_SCN_MEM_READ,
512 SectionKind::getReadOnly());
513 } else {
514 StaticDtorSection =
515 Ctx->getCOFFSection(".dtors",
516 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
517 COFF::IMAGE_SCN_MEM_READ |
518 COFF::IMAGE_SCN_MEM_WRITE,
519 SectionKind::getDataRel());
520 }
521
522 // FIXME: We're emitting LSDA info into a readonly section on COFF, even
523 // though it contains relocatable pointers. In PIC mode, this is probably a
524 // big runtime hit for C++ apps. Either the contents of the LSDA need to be
525 // adjusted or this should be a data section.
526 LSDASection =
527 Ctx->getCOFFSection(".gcc_except_table",
528 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
529 COFF::IMAGE_SCN_MEM_READ,
530 SectionKind::getReadOnly());
531
532 // Debug info.
533 DwarfAbbrevSection =
534 Ctx->getCOFFSection(".debug_abbrev",
535 COFF::IMAGE_SCN_MEM_DISCARDABLE |
536 COFF::IMAGE_SCN_MEM_READ,
537 SectionKind::getMetadata());
538 DwarfInfoSection =
539 Ctx->getCOFFSection(".debug_info",
540 COFF::IMAGE_SCN_MEM_DISCARDABLE |
541 COFF::IMAGE_SCN_MEM_READ,
542 SectionKind::getMetadata());
543 DwarfLineSection =
544 Ctx->getCOFFSection(".debug_line",
545 COFF::IMAGE_SCN_MEM_DISCARDABLE |
546 COFF::IMAGE_SCN_MEM_READ,
547 SectionKind::getMetadata());
548 DwarfFrameSection =
549 Ctx->getCOFFSection(".debug_frame",
550 COFF::IMAGE_SCN_MEM_DISCARDABLE |
551 COFF::IMAGE_SCN_MEM_READ,
552 SectionKind::getMetadata());
553 DwarfPubNamesSection =
554 Ctx->getCOFFSection(".debug_pubnames",
555 COFF::IMAGE_SCN_MEM_DISCARDABLE |
556 COFF::IMAGE_SCN_MEM_READ,
557 SectionKind::getMetadata());
558 DwarfPubTypesSection =
559 Ctx->getCOFFSection(".debug_pubtypes",
560 COFF::IMAGE_SCN_MEM_DISCARDABLE |
561 COFF::IMAGE_SCN_MEM_READ,
562 SectionKind::getMetadata());
563 DwarfStrSection =
564 Ctx->getCOFFSection(".debug_str",
565 COFF::IMAGE_SCN_MEM_DISCARDABLE |
566 COFF::IMAGE_SCN_MEM_READ,
567 SectionKind::getMetadata());
568 DwarfLocSection =
569 Ctx->getCOFFSection(".debug_loc",
570 COFF::IMAGE_SCN_MEM_DISCARDABLE |
571 COFF::IMAGE_SCN_MEM_READ,
572 SectionKind::getMetadata());
573 DwarfARangesSection =
574 Ctx->getCOFFSection(".debug_aranges",
575 COFF::IMAGE_SCN_MEM_DISCARDABLE |
576 COFF::IMAGE_SCN_MEM_READ,
577 SectionKind::getMetadata());
578 DwarfRangesSection =
579 Ctx->getCOFFSection(".debug_ranges",
580 COFF::IMAGE_SCN_MEM_DISCARDABLE |
581 COFF::IMAGE_SCN_MEM_READ,
582 SectionKind::getMetadata());
583 DwarfMacroInfoSection =
584 Ctx->getCOFFSection(".debug_macinfo",
585 COFF::IMAGE_SCN_MEM_DISCARDABLE |
586 COFF::IMAGE_SCN_MEM_READ,
587 SectionKind::getMetadata());
588
589 DrectveSection =
590 Ctx->getCOFFSection(".drectve",
591 COFF::IMAGE_SCN_LNK_INFO,
592 SectionKind::getMetadata());
593
594 PDataSection =
595 Ctx->getCOFFSection(".pdata",
596 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
597 COFF::IMAGE_SCN_MEM_READ,
598 SectionKind::getDataRel());
599
600 XDataSection =
601 Ctx->getCOFFSection(".xdata",
602 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
603 COFF::IMAGE_SCN_MEM_READ,
604 SectionKind::getDataRel());
605 TLSDataSection =
606 Ctx->getCOFFSection(".tls$",
607 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
608 COFF::IMAGE_SCN_MEM_READ |
609 COFF::IMAGE_SCN_MEM_WRITE,
610 SectionKind::getDataRel());
611 }
612
InitMCObjectFileInfo(StringRef TT,Reloc::Model relocm,CodeModel::Model cm,MCContext & ctx)613 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
614 CodeModel::Model cm,
615 MCContext &ctx) {
616 RelocM = relocm;
617 CMModel = cm;
618 Ctx = &ctx;
619
620 // Common.
621 CommDirectiveSupportsAlignment = true;
622 SupportsWeakOmittedEHFrame = true;
623 IsFunctionEHFrameSymbolPrivate = true;
624
625 PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
626 TTypeEncoding = dwarf::DW_EH_PE_absptr;
627
628 EHFrameSection = 0; // Created on demand.
629 CompactUnwindSection = 0; // Used only by selected targets.
630 DwarfAccelNamesSection = 0; // Used only by selected targets.
631 DwarfAccelObjCSection = 0; // Used only by selected targets.
632 DwarfAccelNamespaceSection = 0; // Used only by selected targets.
633 DwarfAccelTypesSection = 0; // Used only by selected targets.
634
635 Triple T(TT);
636 Triple::ArchType Arch = T.getArch();
637 // FIXME: Checking for Arch here to filter out bogus triples such as
638 // cellspu-apple-darwin. Perhaps we should fix in Triple?
639 if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
640 Arch == Triple::arm || Arch == Triple::thumb ||
641 Arch == Triple::ppc || Arch == Triple::ppc64 ||
642 Arch == Triple::UnknownArch) &&
643 (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
644 Env = IsMachO;
645 InitMachOMCObjectFileInfo(T);
646 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
647 (T.getEnvironment() != Triple::ELF) &&
648 (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
649 T.getOS() == Triple::Win32)) {
650 Env = IsCOFF;
651 InitCOFFMCObjectFileInfo(T);
652 } else {
653 Env = IsELF;
654 InitELFMCObjectFileInfo(T);
655 }
656 }
657
InitEHFrameSection()658 void MCObjectFileInfo::InitEHFrameSection() {
659 if (Env == IsMachO)
660 EHFrameSection =
661 Ctx->getMachOSection("__TEXT", "__eh_frame",
662 MCSectionMachO::S_COALESCED |
663 MCSectionMachO::S_ATTR_NO_TOC |
664 MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
665 MCSectionMachO::S_ATTR_LIVE_SUPPORT,
666 SectionKind::getReadOnly());
667 else if (Env == IsELF)
668 EHFrameSection =
669 Ctx->getELFSection(".eh_frame", EHSectionType,
670 EHSectionFlags,
671 SectionKind::getDataRel());
672 else
673 EHFrameSection =
674 Ctx->getCOFFSection(".eh_frame",
675 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
676 COFF::IMAGE_SCN_MEM_READ |
677 COFF::IMAGE_SCN_MEM_WRITE,
678 SectionKind::getDataRel());
679 }
680