1 //===---- MachO_arm64.cpp - JIT linker implementation for MachO/arm64 -----===//
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 // MachO/arm64 jit-link implementation.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "llvm/ExecutionEngine/JITLink/MachO_arm64.h"
14 #include "llvm/ExecutionEngine/JITLink/DWARFRecordSectionSplitter.h"
15 #include "llvm/ExecutionEngine/JITLink/aarch64.h"
16
17 #include "MachOLinkGraphBuilder.h"
18
19 #define DEBUG_TYPE "jitlink"
20
21 using namespace llvm;
22 using namespace llvm::jitlink;
23
24 namespace {
25
26 class MachOLinkGraphBuilder_arm64 : public MachOLinkGraphBuilder {
27 public:
MachOLinkGraphBuilder_arm64(const object::MachOObjectFile & Obj)28 MachOLinkGraphBuilder_arm64(const object::MachOObjectFile &Obj)
29 : MachOLinkGraphBuilder(Obj, Triple("arm64-apple-darwin"),
30 aarch64::getEdgeKindName),
31 NumSymbols(Obj.getSymtabLoadCommand().nsyms) {}
32
33 private:
34 enum MachOARM64RelocationKind : Edge::Kind {
35 MachOBranch26 = Edge::FirstRelocation,
36 MachOPointer32,
37 MachOPointer64,
38 MachOPointer64Anon,
39 MachOPage21,
40 MachOPageOffset12,
41 MachOGOTPage21,
42 MachOGOTPageOffset12,
43 MachOTLVPage21,
44 MachOTLVPageOffset12,
45 MachOPointerToGOT,
46 MachOPairedAddend,
47 MachOLDRLiteral19,
48 MachODelta32,
49 MachODelta64,
50 MachONegDelta32,
51 MachONegDelta64,
52 };
53
54 static Expected<MachOARM64RelocationKind>
getRelocationKind(const MachO::relocation_info & RI)55 getRelocationKind(const MachO::relocation_info &RI) {
56 switch (RI.r_type) {
57 case MachO::ARM64_RELOC_UNSIGNED:
58 if (!RI.r_pcrel) {
59 if (RI.r_length == 3)
60 return RI.r_extern ? MachOPointer64 : MachOPointer64Anon;
61 else if (RI.r_length == 2)
62 return MachOPointer32;
63 }
64 break;
65 case MachO::ARM64_RELOC_SUBTRACTOR:
66 // SUBTRACTOR must be non-pc-rel, extern, with length 2 or 3.
67 // Initially represent SUBTRACTOR relocations with 'Delta<W>'.
68 // They may be turned into NegDelta<W> by parsePairRelocation.
69 if (!RI.r_pcrel && RI.r_extern) {
70 if (RI.r_length == 2)
71 return MachODelta32;
72 else if (RI.r_length == 3)
73 return MachODelta64;
74 }
75 break;
76 case MachO::ARM64_RELOC_BRANCH26:
77 if (RI.r_pcrel && RI.r_extern && RI.r_length == 2)
78 return MachOBranch26;
79 break;
80 case MachO::ARM64_RELOC_PAGE21:
81 if (RI.r_pcrel && RI.r_extern && RI.r_length == 2)
82 return MachOPage21;
83 break;
84 case MachO::ARM64_RELOC_PAGEOFF12:
85 if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2)
86 return MachOPageOffset12;
87 break;
88 case MachO::ARM64_RELOC_GOT_LOAD_PAGE21:
89 if (RI.r_pcrel && RI.r_extern && RI.r_length == 2)
90 return MachOGOTPage21;
91 break;
92 case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12:
93 if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2)
94 return MachOGOTPageOffset12;
95 break;
96 case MachO::ARM64_RELOC_POINTER_TO_GOT:
97 if (RI.r_pcrel && RI.r_extern && RI.r_length == 2)
98 return MachOPointerToGOT;
99 break;
100 case MachO::ARM64_RELOC_ADDEND:
101 if (!RI.r_pcrel && !RI.r_extern && RI.r_length == 2)
102 return MachOPairedAddend;
103 break;
104 case MachO::ARM64_RELOC_TLVP_LOAD_PAGE21:
105 if (RI.r_pcrel && RI.r_extern && RI.r_length == 2)
106 return MachOTLVPage21;
107 break;
108 case MachO::ARM64_RELOC_TLVP_LOAD_PAGEOFF12:
109 if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2)
110 return MachOTLVPageOffset12;
111 break;
112 }
113
114 return make_error<JITLinkError>(
115 "Unsupported arm64 relocation: address=" +
116 formatv("{0:x8}", RI.r_address) +
117 ", symbolnum=" + formatv("{0:x6}", RI.r_symbolnum) +
118 ", kind=" + formatv("{0:x1}", RI.r_type) +
119 ", pc_rel=" + (RI.r_pcrel ? "true" : "false") +
120 ", extern=" + (RI.r_extern ? "true" : "false") +
121 ", length=" + formatv("{0:d}", RI.r_length));
122 }
123
124 using PairRelocInfo = std::tuple<Edge::Kind, Symbol *, uint64_t>;
125
126 // Parses paired SUBTRACTOR/UNSIGNED relocations and, on success,
127 // returns the edge kind and addend to be used.
128 Expected<PairRelocInfo>
parsePairRelocation(Block & BlockToFix,Edge::Kind SubtractorKind,const MachO::relocation_info & SubRI,orc::ExecutorAddr FixupAddress,const char * FixupContent,object::relocation_iterator & UnsignedRelItr,object::relocation_iterator & RelEnd)129 parsePairRelocation(Block &BlockToFix, Edge::Kind SubtractorKind,
130 const MachO::relocation_info &SubRI,
131 orc::ExecutorAddr FixupAddress, const char *FixupContent,
132 object::relocation_iterator &UnsignedRelItr,
133 object::relocation_iterator &RelEnd) {
134 using namespace support;
135
136 assert(((SubtractorKind == MachODelta32 && SubRI.r_length == 2) ||
137 (SubtractorKind == MachODelta64 && SubRI.r_length == 3)) &&
138 "Subtractor kind should match length");
139 assert(SubRI.r_extern && "SUBTRACTOR reloc symbol should be extern");
140 assert(!SubRI.r_pcrel && "SUBTRACTOR reloc should not be PCRel");
141
142 if (UnsignedRelItr == RelEnd)
143 return make_error<JITLinkError>("arm64 SUBTRACTOR without paired "
144 "UNSIGNED relocation");
145
146 auto UnsignedRI = getRelocationInfo(UnsignedRelItr);
147
148 if (SubRI.r_address != UnsignedRI.r_address)
149 return make_error<JITLinkError>("arm64 SUBTRACTOR and paired UNSIGNED "
150 "point to different addresses");
151
152 if (SubRI.r_length != UnsignedRI.r_length)
153 return make_error<JITLinkError>("length of arm64 SUBTRACTOR and paired "
154 "UNSIGNED reloc must match");
155
156 Symbol *FromSymbol;
157 if (auto FromSymbolOrErr = findSymbolByIndex(SubRI.r_symbolnum))
158 FromSymbol = FromSymbolOrErr->GraphSymbol;
159 else
160 return FromSymbolOrErr.takeError();
161
162 // Read the current fixup value.
163 uint64_t FixupValue = 0;
164 if (SubRI.r_length == 3)
165 FixupValue = *(const little64_t *)FixupContent;
166 else
167 FixupValue = *(const little32_t *)FixupContent;
168
169 // Find 'ToSymbol' using symbol number or address, depending on whether the
170 // paired UNSIGNED relocation is extern.
171 Symbol *ToSymbol = nullptr;
172 if (UnsignedRI.r_extern) {
173 // Find target symbol by symbol index.
174 if (auto ToSymbolOrErr = findSymbolByIndex(UnsignedRI.r_symbolnum))
175 ToSymbol = ToSymbolOrErr->GraphSymbol;
176 else
177 return ToSymbolOrErr.takeError();
178 } else {
179 auto ToSymbolSec = findSectionByIndex(UnsignedRI.r_symbolnum - 1);
180 if (!ToSymbolSec)
181 return ToSymbolSec.takeError();
182 ToSymbol = getSymbolByAddress(*ToSymbolSec, ToSymbolSec->Address);
183 assert(ToSymbol && "No symbol for section");
184 FixupValue -= ToSymbol->getAddress().getValue();
185 }
186
187 Edge::Kind DeltaKind;
188 Symbol *TargetSymbol;
189 uint64_t Addend;
190 if (&BlockToFix == &FromSymbol->getAddressable()) {
191 TargetSymbol = ToSymbol;
192 DeltaKind = (SubRI.r_length == 3) ? aarch64::Delta64 : aarch64::Delta32;
193 Addend = FixupValue + (FixupAddress - FromSymbol->getAddress());
194 // FIXME: handle extern 'from'.
195 } else if (&BlockToFix == &ToSymbol->getAddressable()) {
196 TargetSymbol = &*FromSymbol;
197 DeltaKind =
198 (SubRI.r_length == 3) ? aarch64::NegDelta64 : aarch64::NegDelta32;
199 Addend = FixupValue - (FixupAddress - ToSymbol->getAddress());
200 } else {
201 // BlockToFix was neither FromSymbol nor ToSymbol.
202 return make_error<JITLinkError>("SUBTRACTOR relocation must fix up "
203 "either 'A' or 'B' (or a symbol in one "
204 "of their alt-entry groups)");
205 }
206
207 return PairRelocInfo(DeltaKind, TargetSymbol, Addend);
208 }
209
addRelocations()210 Error addRelocations() override {
211 using namespace support;
212 auto &Obj = getObject();
213
214 LLVM_DEBUG(dbgs() << "Processing relocations:\n");
215
216 for (auto &S : Obj.sections()) {
217
218 orc::ExecutorAddr SectionAddress(S.getAddress());
219
220 // Skip relocations virtual sections.
221 if (S.isVirtual()) {
222 if (S.relocation_begin() != S.relocation_end())
223 return make_error<JITLinkError>("Virtual section contains "
224 "relocations");
225 continue;
226 }
227
228 auto NSec =
229 findSectionByIndex(Obj.getSectionIndex(S.getRawDataRefImpl()));
230 if (!NSec)
231 return NSec.takeError();
232
233 // Skip relocations for MachO sections without corresponding graph
234 // sections.
235 {
236 if (!NSec->GraphSection) {
237 LLVM_DEBUG({
238 dbgs() << " Skipping relocations for MachO section "
239 << NSec->SegName << "/" << NSec->SectName
240 << " which has no associated graph section\n";
241 });
242 continue;
243 }
244 }
245
246 for (auto RelItr = S.relocation_begin(), RelEnd = S.relocation_end();
247 RelItr != RelEnd; ++RelItr) {
248
249 MachO::relocation_info RI = getRelocationInfo(RelItr);
250
251 // Validate the relocation kind.
252 auto MachORelocKind = getRelocationKind(RI);
253 if (!MachORelocKind)
254 return MachORelocKind.takeError();
255
256 // Find the address of the value to fix up.
257 orc::ExecutorAddr FixupAddress =
258 SectionAddress + (uint32_t)RI.r_address;
259 LLVM_DEBUG({
260 dbgs() << " " << NSec->SectName << " + "
261 << formatv("{0:x8}", RI.r_address) << ":\n";
262 });
263
264 // Find the block that the fixup points to.
265 Block *BlockToFix = nullptr;
266 {
267 auto SymbolToFixOrErr = findSymbolByAddress(*NSec, FixupAddress);
268 if (!SymbolToFixOrErr)
269 return SymbolToFixOrErr.takeError();
270 BlockToFix = &SymbolToFixOrErr->getBlock();
271 }
272
273 if (FixupAddress + orc::ExecutorAddrDiff(1ULL << RI.r_length) >
274 BlockToFix->getAddress() + BlockToFix->getContent().size())
275 return make_error<JITLinkError>(
276 "Relocation content extends past end of fixup block");
277
278 Edge::Kind Kind = Edge::Invalid;
279
280 // Get a pointer to the fixup content.
281 const char *FixupContent = BlockToFix->getContent().data() +
282 (FixupAddress - BlockToFix->getAddress());
283
284 // The target symbol and addend will be populated by the switch below.
285 Symbol *TargetSymbol = nullptr;
286 uint64_t Addend = 0;
287
288 if (*MachORelocKind == MachOPairedAddend) {
289 // If this is an Addend relocation then process it and move to the
290 // paired reloc.
291
292 Addend = SignExtend64(RI.r_symbolnum, 24);
293
294 if (RelItr == RelEnd)
295 return make_error<JITLinkError>("Unpaired Addend reloc at " +
296 formatv("{0:x16}", FixupAddress));
297 ++RelItr;
298 RI = getRelocationInfo(RelItr);
299
300 MachORelocKind = getRelocationKind(RI);
301 if (!MachORelocKind)
302 return MachORelocKind.takeError();
303
304 if (*MachORelocKind != MachOBranch26 &&
305 *MachORelocKind != MachOPage21 &&
306 *MachORelocKind != MachOPageOffset12)
307 return make_error<JITLinkError>(
308 "Invalid relocation pair: Addend + " +
309 StringRef(getMachOARM64RelocationKindName(*MachORelocKind)));
310
311 LLVM_DEBUG({
312 dbgs() << " Addend: value = " << formatv("{0:x6}", Addend)
313 << ", pair is "
314 << getMachOARM64RelocationKindName(*MachORelocKind) << "\n";
315 });
316
317 // Find the address of the value to fix up.
318 orc::ExecutorAddr PairedFixupAddress =
319 SectionAddress + (uint32_t)RI.r_address;
320 if (PairedFixupAddress != FixupAddress)
321 return make_error<JITLinkError>("Paired relocation points at "
322 "different target");
323 }
324
325 switch (*MachORelocKind) {
326 case MachOBranch26: {
327 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
328 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
329 else
330 return TargetSymbolOrErr.takeError();
331 uint32_t Instr = *(const ulittle32_t *)FixupContent;
332 if ((Instr & 0x7fffffff) != 0x14000000)
333 return make_error<JITLinkError>("BRANCH26 target is not a B or BL "
334 "instruction with a zero addend");
335 Kind = aarch64::Branch26PCRel;
336 break;
337 }
338 case MachOPointer32:
339 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
340 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
341 else
342 return TargetSymbolOrErr.takeError();
343 Addend = *(const ulittle32_t *)FixupContent;
344 Kind = aarch64::Pointer32;
345 break;
346 case MachOPointer64:
347 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
348 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
349 else
350 return TargetSymbolOrErr.takeError();
351 Addend = *(const ulittle64_t *)FixupContent;
352 Kind = aarch64::Pointer64;
353 break;
354 case MachOPointer64Anon: {
355 orc::ExecutorAddr TargetAddress(*(const ulittle64_t *)FixupContent);
356 auto TargetNSec = findSectionByIndex(RI.r_symbolnum - 1);
357 if (!TargetNSec)
358 return TargetNSec.takeError();
359 if (auto TargetSymbolOrErr =
360 findSymbolByAddress(*TargetNSec, TargetAddress))
361 TargetSymbol = &*TargetSymbolOrErr;
362 else
363 return TargetSymbolOrErr.takeError();
364 Addend = TargetAddress - TargetSymbol->getAddress();
365 Kind = aarch64::Pointer64;
366 break;
367 }
368 case MachOPage21:
369 case MachOGOTPage21:
370 case MachOTLVPage21: {
371 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
372 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
373 else
374 return TargetSymbolOrErr.takeError();
375 uint32_t Instr = *(const ulittle32_t *)FixupContent;
376 if ((Instr & 0xffffffe0) != 0x90000000)
377 return make_error<JITLinkError>("PAGE21/GOTPAGE21 target is not an "
378 "ADRP instruction with a zero "
379 "addend");
380
381 if (*MachORelocKind == MachOPage21) {
382 Kind = aarch64::Page21;
383 } else if (*MachORelocKind == MachOGOTPage21) {
384 Kind = aarch64::RequestGOTAndTransformToPage21;
385 } else if (*MachORelocKind == MachOTLVPage21) {
386 Kind = aarch64::RequestTLVPAndTransformToPage21;
387 }
388 break;
389 }
390 case MachOPageOffset12: {
391 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
392 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
393 else
394 return TargetSymbolOrErr.takeError();
395 uint32_t Instr = *(const ulittle32_t *)FixupContent;
396 uint32_t EncodedAddend = (Instr & 0x003FFC00) >> 10;
397 if (EncodedAddend != 0)
398 return make_error<JITLinkError>("GOTPAGEOFF12 target has non-zero "
399 "encoded addend");
400 Kind = aarch64::PageOffset12;
401 break;
402 }
403 case MachOGOTPageOffset12:
404 case MachOTLVPageOffset12: {
405 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
406 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
407 else
408 return TargetSymbolOrErr.takeError();
409 uint32_t Instr = *(const ulittle32_t *)FixupContent;
410 if ((Instr & 0xfffffc00) != 0xf9400000)
411 return make_error<JITLinkError>("GOTPAGEOFF12 target is not an LDR "
412 "immediate instruction with a zero "
413 "addend");
414
415 if (*MachORelocKind == MachOGOTPageOffset12) {
416 Kind = aarch64::RequestGOTAndTransformToPageOffset12;
417 } else if (*MachORelocKind == MachOTLVPageOffset12) {
418 Kind = aarch64::RequestTLVPAndTransformToPageOffset12;
419 }
420 break;
421 }
422 case MachOPointerToGOT:
423 if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum))
424 TargetSymbol = TargetSymbolOrErr->GraphSymbol;
425 else
426 return TargetSymbolOrErr.takeError();
427
428 Kind = aarch64::RequestGOTAndTransformToDelta32;
429 break;
430 case MachODelta32:
431 case MachODelta64: {
432 // We use Delta32/Delta64 to represent SUBTRACTOR relocations.
433 // parsePairRelocation handles the paired reloc, and returns the
434 // edge kind to be used (either Delta32/Delta64, or
435 // NegDelta32/NegDelta64, depending on the direction of the
436 // subtraction) along with the addend.
437 auto PairInfo =
438 parsePairRelocation(*BlockToFix, *MachORelocKind, RI,
439 FixupAddress, FixupContent, ++RelItr, RelEnd);
440 if (!PairInfo)
441 return PairInfo.takeError();
442 std::tie(Kind, TargetSymbol, Addend) = *PairInfo;
443 assert(TargetSymbol && "No target symbol from parsePairRelocation?");
444 break;
445 }
446 default:
447 llvm_unreachable("Special relocation kind should not appear in "
448 "mach-o file");
449 }
450
451 LLVM_DEBUG({
452 dbgs() << " ";
453 Edge GE(Kind, FixupAddress - BlockToFix->getAddress(), *TargetSymbol,
454 Addend);
455 printEdge(dbgs(), *BlockToFix, GE, aarch64::getEdgeKindName(Kind));
456 dbgs() << "\n";
457 });
458 BlockToFix->addEdge(Kind, FixupAddress - BlockToFix->getAddress(),
459 *TargetSymbol, Addend);
460 }
461 }
462 return Error::success();
463 }
464
465 /// Return the string name of the given MachO arm64 edge kind.
getMachOARM64RelocationKindName(Edge::Kind R)466 const char *getMachOARM64RelocationKindName(Edge::Kind R) {
467 switch (R) {
468 case MachOBranch26:
469 return "MachOBranch26";
470 case MachOPointer64:
471 return "MachOPointer64";
472 case MachOPointer64Anon:
473 return "MachOPointer64Anon";
474 case MachOPage21:
475 return "MachOPage21";
476 case MachOPageOffset12:
477 return "MachOPageOffset12";
478 case MachOGOTPage21:
479 return "MachOGOTPage21";
480 case MachOGOTPageOffset12:
481 return "MachOGOTPageOffset12";
482 case MachOTLVPage21:
483 return "MachOTLVPage21";
484 case MachOTLVPageOffset12:
485 return "MachOTLVPageOffset12";
486 case MachOPointerToGOT:
487 return "MachOPointerToGOT";
488 case MachOPairedAddend:
489 return "MachOPairedAddend";
490 case MachOLDRLiteral19:
491 return "MachOLDRLiteral19";
492 case MachODelta32:
493 return "MachODelta32";
494 case MachODelta64:
495 return "MachODelta64";
496 case MachONegDelta32:
497 return "MachONegDelta32";
498 case MachONegDelta64:
499 return "MachONegDelta64";
500 default:
501 return getGenericEdgeKindName(static_cast<Edge::Kind>(R));
502 }
503 }
504
505 unsigned NumSymbols = 0;
506 };
507
508 } // namespace
509
510 namespace llvm {
511 namespace jitlink {
512
buildTables_MachO_arm64(LinkGraph & G)513 Error buildTables_MachO_arm64(LinkGraph &G) {
514 LLVM_DEBUG(dbgs() << "Visiting edges in graph:\n");
515
516 aarch64::GOTTableManager GOT;
517 aarch64::PLTTableManager PLT(GOT);
518 visitExistingEdges(G, GOT, PLT);
519 return Error::success();
520 }
521
522 class MachOJITLinker_arm64 : public JITLinker<MachOJITLinker_arm64> {
523 friend class JITLinker<MachOJITLinker_arm64>;
524
525 public:
MachOJITLinker_arm64(std::unique_ptr<JITLinkContext> Ctx,std::unique_ptr<LinkGraph> G,PassConfiguration PassConfig)526 MachOJITLinker_arm64(std::unique_ptr<JITLinkContext> Ctx,
527 std::unique_ptr<LinkGraph> G,
528 PassConfiguration PassConfig)
529 : JITLinker(std::move(Ctx), std::move(G), std::move(PassConfig)) {}
530
531 private:
applyFixup(LinkGraph & G,Block & B,const Edge & E) const532 Error applyFixup(LinkGraph &G, Block &B, const Edge &E) const {
533 return aarch64::applyFixup(G, B, E);
534 }
535
536 uint64_t NullValue = 0;
537 };
538
539 Expected<std::unique_ptr<LinkGraph>>
createLinkGraphFromMachOObject_arm64(MemoryBufferRef ObjectBuffer)540 createLinkGraphFromMachOObject_arm64(MemoryBufferRef ObjectBuffer) {
541 auto MachOObj = object::ObjectFile::createMachOObjectFile(ObjectBuffer);
542 if (!MachOObj)
543 return MachOObj.takeError();
544 return MachOLinkGraphBuilder_arm64(**MachOObj).buildGraph();
545 }
546
link_MachO_arm64(std::unique_ptr<LinkGraph> G,std::unique_ptr<JITLinkContext> Ctx)547 void link_MachO_arm64(std::unique_ptr<LinkGraph> G,
548 std::unique_ptr<JITLinkContext> Ctx) {
549
550 PassConfiguration Config;
551
552 if (Ctx->shouldAddDefaultTargetPasses(G->getTargetTriple())) {
553 // Add a mark-live pass.
554 if (auto MarkLive = Ctx->getMarkLivePass(G->getTargetTriple()))
555 Config.PrePrunePasses.push_back(std::move(MarkLive));
556 else
557 Config.PrePrunePasses.push_back(markAllSymbolsLive);
558
559 // Add compact unwind splitter pass.
560 Config.PrePrunePasses.push_back(
561 CompactUnwindSplitter("__LD,__compact_unwind"));
562
563 // Add eh-frame passses.
564 // FIXME: Prune eh-frames for which compact-unwind is available once
565 // we support compact-unwind registration with libunwind.
566 Config.PrePrunePasses.push_back(createEHFrameSplitterPass_MachO_arm64());
567 Config.PrePrunePasses.push_back(createEHFrameEdgeFixerPass_MachO_arm64());
568
569 // Add an in-place GOT/Stubs pass.
570 Config.PostPrunePasses.push_back(buildTables_MachO_arm64);
571 }
572
573 if (auto Err = Ctx->modifyPassConfig(*G, Config))
574 return Ctx->notifyFailed(std::move(Err));
575
576 // Construct a JITLinker and run the link function.
577 MachOJITLinker_arm64::link(std::move(Ctx), std::move(G), std::move(Config));
578 }
579
createEHFrameSplitterPass_MachO_arm64()580 LinkGraphPassFunction createEHFrameSplitterPass_MachO_arm64() {
581 return DWARFRecordSectionSplitter("__TEXT,__eh_frame");
582 }
583
createEHFrameEdgeFixerPass_MachO_arm64()584 LinkGraphPassFunction createEHFrameEdgeFixerPass_MachO_arm64() {
585 return EHFrameEdgeFixer("__TEXT,__eh_frame", aarch64::PointerSize,
586 aarch64::Pointer32, aarch64::Pointer64,
587 aarch64::Delta32, aarch64::Delta64,
588 aarch64::NegDelta32);
589 }
590
591 } // end namespace jitlink
592 } // end namespace llvm
593