| //===---- MachO_arm64.cpp - JIT linker implementation for MachO/arm64 -----===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // MachO/arm64 jit-link implementation. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ExecutionEngine/JITLink/MachO_arm64.h" |
| #include "llvm/ExecutionEngine/JITLink/DWARFRecordSectionSplitter.h" |
| #include "llvm/ExecutionEngine/JITLink/aarch64.h" |
| |
| #include "DefineExternalSectionStartAndEndSymbols.h" |
| #include "MachOLinkGraphBuilder.h" |
| |
| #define DEBUG_TYPE "jitlink" |
| |
| using namespace llvm; |
| using namespace llvm::jitlink; |
| |
| namespace { |
| |
| class MachOLinkGraphBuilder_arm64 : public MachOLinkGraphBuilder { |
| public: |
| MachOLinkGraphBuilder_arm64(const object::MachOObjectFile &Obj, |
| SubtargetFeatures Features) |
| : MachOLinkGraphBuilder(Obj, Triple("arm64-apple-darwin"), |
| std::move(Features), aarch64::getEdgeKindName), |
| NumSymbols(Obj.getSymtabLoadCommand().nsyms) {} |
| |
| private: |
| enum MachOARM64RelocationKind : Edge::Kind { |
| MachOBranch26 = Edge::FirstRelocation, |
| MachOPointer32, |
| MachOPointer64, |
| MachOPointer64Anon, |
| MachOPage21, |
| MachOPageOffset12, |
| MachOGOTPage21, |
| MachOGOTPageOffset12, |
| MachOTLVPage21, |
| MachOTLVPageOffset12, |
| MachOPointerToGOT, |
| MachOPairedAddend, |
| MachOLDRLiteral19, |
| MachODelta32, |
| MachODelta64, |
| MachONegDelta32, |
| MachONegDelta64, |
| }; |
| |
| static Expected<MachOARM64RelocationKind> |
| getRelocationKind(const MachO::relocation_info &RI) { |
| switch (RI.r_type) { |
| case MachO::ARM64_RELOC_UNSIGNED: |
| if (!RI.r_pcrel) { |
| if (RI.r_length == 3) |
| return RI.r_extern ? MachOPointer64 : MachOPointer64Anon; |
| else if (RI.r_length == 2) |
| return MachOPointer32; |
| } |
| break; |
| case MachO::ARM64_RELOC_SUBTRACTOR: |
| // SUBTRACTOR must be non-pc-rel, extern, with length 2 or 3. |
| // Initially represent SUBTRACTOR relocations with 'Delta<W>'. |
| // They may be turned into NegDelta<W> by parsePairRelocation. |
| if (!RI.r_pcrel && RI.r_extern) { |
| if (RI.r_length == 2) |
| return MachODelta32; |
| else if (RI.r_length == 3) |
| return MachODelta64; |
| } |
| break; |
| case MachO::ARM64_RELOC_BRANCH26: |
| if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOBranch26; |
| break; |
| case MachO::ARM64_RELOC_PAGE21: |
| if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOPage21; |
| break; |
| case MachO::ARM64_RELOC_PAGEOFF12: |
| if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOPageOffset12; |
| break; |
| case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: |
| if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOGOTPage21; |
| break; |
| case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: |
| if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOGOTPageOffset12; |
| break; |
| case MachO::ARM64_RELOC_POINTER_TO_GOT: |
| if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOPointerToGOT; |
| break; |
| case MachO::ARM64_RELOC_ADDEND: |
| if (!RI.r_pcrel && !RI.r_extern && RI.r_length == 2) |
| return MachOPairedAddend; |
| break; |
| case MachO::ARM64_RELOC_TLVP_LOAD_PAGE21: |
| if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOTLVPage21; |
| break; |
| case MachO::ARM64_RELOC_TLVP_LOAD_PAGEOFF12: |
| if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2) |
| return MachOTLVPageOffset12; |
| break; |
| } |
| |
| return make_error<JITLinkError>( |
| "Unsupported arm64 relocation: address=" + |
| formatv("{0:x8}", RI.r_address) + |
| ", symbolnum=" + formatv("{0:x6}", RI.r_symbolnum) + |
| ", kind=" + formatv("{0:x1}", RI.r_type) + |
| ", pc_rel=" + (RI.r_pcrel ? "true" : "false") + |
| ", extern=" + (RI.r_extern ? "true" : "false") + |
| ", length=" + formatv("{0:d}", RI.r_length)); |
| } |
| |
| using PairRelocInfo = std::tuple<Edge::Kind, Symbol *, uint64_t>; |
| |
| // Parses paired SUBTRACTOR/UNSIGNED relocations and, on success, |
| // returns the edge kind and addend to be used. |
| 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) { |
| using namespace support; |
| |
| assert(((SubtractorKind == MachODelta32 && SubRI.r_length == 2) || |
| (SubtractorKind == MachODelta64 && SubRI.r_length == 3)) && |
| "Subtractor kind should match length"); |
| assert(SubRI.r_extern && "SUBTRACTOR reloc symbol should be extern"); |
| assert(!SubRI.r_pcrel && "SUBTRACTOR reloc should not be PCRel"); |
| |
| if (UnsignedRelItr == RelEnd) |
| return make_error<JITLinkError>("arm64 SUBTRACTOR without paired " |
| "UNSIGNED relocation"); |
| |
| auto UnsignedRI = getRelocationInfo(UnsignedRelItr); |
| |
| if (SubRI.r_address != UnsignedRI.r_address) |
| return make_error<JITLinkError>("arm64 SUBTRACTOR and paired UNSIGNED " |
| "point to different addresses"); |
| |
| if (SubRI.r_length != UnsignedRI.r_length) |
| return make_error<JITLinkError>("length of arm64 SUBTRACTOR and paired " |
| "UNSIGNED reloc must match"); |
| |
| Symbol *FromSymbol; |
| if (auto FromSymbolOrErr = findSymbolByIndex(SubRI.r_symbolnum)) |
| FromSymbol = FromSymbolOrErr->GraphSymbol; |
| else |
| return FromSymbolOrErr.takeError(); |
| |
| // Read the current fixup value. |
| uint64_t FixupValue = 0; |
| if (SubRI.r_length == 3) |
| FixupValue = *(const little64_t *)FixupContent; |
| else |
| FixupValue = *(const little32_t *)FixupContent; |
| |
| // Find 'ToSymbol' using symbol number or address, depending on whether the |
| // paired UNSIGNED relocation is extern. |
| Symbol *ToSymbol = nullptr; |
| if (UnsignedRI.r_extern) { |
| // Find target symbol by symbol index. |
| if (auto ToSymbolOrErr = findSymbolByIndex(UnsignedRI.r_symbolnum)) |
| ToSymbol = ToSymbolOrErr->GraphSymbol; |
| else |
| return ToSymbolOrErr.takeError(); |
| } else { |
| auto ToSymbolSec = findSectionByIndex(UnsignedRI.r_symbolnum - 1); |
| if (!ToSymbolSec) |
| return ToSymbolSec.takeError(); |
| ToSymbol = getSymbolByAddress(*ToSymbolSec, ToSymbolSec->Address); |
| assert(ToSymbol && "No symbol for section"); |
| FixupValue -= ToSymbol->getAddress().getValue(); |
| } |
| |
| Edge::Kind DeltaKind; |
| Symbol *TargetSymbol; |
| uint64_t Addend; |
| |
| bool FixingFromSymbol = true; |
| if (&BlockToFix == &FromSymbol->getAddressable()) { |
| if (LLVM_UNLIKELY(&BlockToFix == &ToSymbol->getAddressable())) { |
| // From and To are symbols in the same block. Decide direction by offset |
| // instead. |
| if (ToSymbol->getAddress() > FixupAddress) |
| FixingFromSymbol = true; |
| else if (FromSymbol->getAddress() > FixupAddress) |
| FixingFromSymbol = false; |
| else |
| FixingFromSymbol = FromSymbol->getAddress() >= ToSymbol->getAddress(); |
| } else |
| FixingFromSymbol = true; |
| } else { |
| if (&BlockToFix == &ToSymbol->getAddressable()) |
| FixingFromSymbol = false; |
| else { |
| // BlockToFix was neither FromSymbol nor ToSymbol. |
| return make_error<JITLinkError>("SUBTRACTOR relocation must fix up " |
| "either 'A' or 'B' (or a symbol in one " |
| "of their alt-entry groups)"); |
| } |
| } |
| |
| if (FixingFromSymbol) { |
| TargetSymbol = ToSymbol; |
| DeltaKind = (SubRI.r_length == 3) ? aarch64::Delta64 : aarch64::Delta32; |
| Addend = FixupValue + (FixupAddress - FromSymbol->getAddress()); |
| // FIXME: handle extern 'from'. |
| } else { |
| TargetSymbol = &*FromSymbol; |
| DeltaKind = |
| (SubRI.r_length == 3) ? aarch64::NegDelta64 : aarch64::NegDelta32; |
| Addend = FixupValue - (FixupAddress - ToSymbol->getAddress()); |
| } |
| |
| return PairRelocInfo(DeltaKind, TargetSymbol, Addend); |
| } |
| |
| Error addRelocations() override { |
| using namespace support; |
| auto &Obj = getObject(); |
| |
| LLVM_DEBUG(dbgs() << "Processing relocations:\n"); |
| |
| for (auto &S : Obj.sections()) { |
| |
| orc::ExecutorAddr SectionAddress(S.getAddress()); |
| |
| // Skip relocations virtual sections. |
| if (S.isVirtual()) { |
| if (S.relocation_begin() != S.relocation_end()) |
| return make_error<JITLinkError>("Virtual section contains " |
| "relocations"); |
| continue; |
| } |
| |
| auto NSec = |
| findSectionByIndex(Obj.getSectionIndex(S.getRawDataRefImpl())); |
| if (!NSec) |
| return NSec.takeError(); |
| |
| // Skip relocations for MachO sections without corresponding graph |
| // sections. |
| { |
| if (!NSec->GraphSection) { |
| LLVM_DEBUG({ |
| dbgs() << " Skipping relocations for MachO section " |
| << NSec->SegName << "/" << NSec->SectName |
| << " which has no associated graph section\n"; |
| }); |
| continue; |
| } |
| } |
| |
| for (auto RelItr = S.relocation_begin(), RelEnd = S.relocation_end(); |
| RelItr != RelEnd; ++RelItr) { |
| |
| MachO::relocation_info RI = getRelocationInfo(RelItr); |
| |
| // Validate the relocation kind. |
| auto MachORelocKind = getRelocationKind(RI); |
| if (!MachORelocKind) |
| return MachORelocKind.takeError(); |
| |
| // Find the address of the value to fix up. |
| orc::ExecutorAddr FixupAddress = |
| SectionAddress + (uint32_t)RI.r_address; |
| LLVM_DEBUG({ |
| dbgs() << " " << NSec->SectName << " + " |
| << formatv("{0:x8}", RI.r_address) << ":\n"; |
| }); |
| |
| // Find the block that the fixup points to. |
| Block *BlockToFix = nullptr; |
| { |
| auto SymbolToFixOrErr = findSymbolByAddress(*NSec, FixupAddress); |
| if (!SymbolToFixOrErr) |
| return SymbolToFixOrErr.takeError(); |
| BlockToFix = &SymbolToFixOrErr->getBlock(); |
| } |
| |
| if (FixupAddress + orc::ExecutorAddrDiff(1ULL << RI.r_length) > |
| BlockToFix->getAddress() + BlockToFix->getContent().size()) |
| return make_error<JITLinkError>( |
| "Relocation content extends past end of fixup block"); |
| |
| Edge::Kind Kind = Edge::Invalid; |
| |
| // Get a pointer to the fixup content. |
| const char *FixupContent = BlockToFix->getContent().data() + |
| (FixupAddress - BlockToFix->getAddress()); |
| |
| // The target symbol and addend will be populated by the switch below. |
| Symbol *TargetSymbol = nullptr; |
| uint64_t Addend = 0; |
| |
| if (*MachORelocKind == MachOPairedAddend) { |
| // If this is an Addend relocation then process it and move to the |
| // paired reloc. |
| |
| Addend = SignExtend64(RI.r_symbolnum, 24); |
| |
| ++RelItr; |
| if (RelItr == RelEnd) |
| return make_error<JITLinkError>("Unpaired Addend reloc at " + |
| formatv("{0:x16}", FixupAddress)); |
| RI = getRelocationInfo(RelItr); |
| |
| MachORelocKind = getRelocationKind(RI); |
| if (!MachORelocKind) |
| return MachORelocKind.takeError(); |
| |
| if (*MachORelocKind != MachOBranch26 && |
| *MachORelocKind != MachOPage21 && |
| *MachORelocKind != MachOPageOffset12) |
| return make_error<JITLinkError>( |
| "Invalid relocation pair: Addend + " + |
| StringRef(getMachOARM64RelocationKindName(*MachORelocKind))); |
| |
| LLVM_DEBUG({ |
| dbgs() << " Addend: value = " << formatv("{0:x6}", Addend) |
| << ", pair is " |
| << getMachOARM64RelocationKindName(*MachORelocKind) << "\n"; |
| }); |
| |
| // Find the address of the value to fix up. |
| orc::ExecutorAddr PairedFixupAddress = |
| SectionAddress + (uint32_t)RI.r_address; |
| if (PairedFixupAddress != FixupAddress) |
| return make_error<JITLinkError>("Paired relocation points at " |
| "different target"); |
| } |
| |
| switch (*MachORelocKind) { |
| case MachOBranch26: { |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| uint32_t Instr = *(const ulittle32_t *)FixupContent; |
| if ((Instr & 0x7fffffff) != 0x14000000) |
| return make_error<JITLinkError>("BRANCH26 target is not a B or BL " |
| "instruction with a zero addend"); |
| Kind = aarch64::Branch26PCRel; |
| break; |
| } |
| case MachOPointer32: |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| Addend = *(const ulittle32_t *)FixupContent; |
| Kind = aarch64::Pointer32; |
| break; |
| case MachOPointer64: |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| Addend = *(const ulittle64_t *)FixupContent; |
| Kind = aarch64::Pointer64; |
| break; |
| case MachOPointer64Anon: { |
| orc::ExecutorAddr TargetAddress(*(const ulittle64_t *)FixupContent); |
| auto TargetNSec = findSectionByIndex(RI.r_symbolnum - 1); |
| if (!TargetNSec) |
| return TargetNSec.takeError(); |
| if (auto TargetSymbolOrErr = |
| findSymbolByAddress(*TargetNSec, TargetAddress)) |
| TargetSymbol = &*TargetSymbolOrErr; |
| else |
| return TargetSymbolOrErr.takeError(); |
| Addend = TargetAddress - TargetSymbol->getAddress(); |
| Kind = aarch64::Pointer64; |
| break; |
| } |
| case MachOPage21: |
| case MachOGOTPage21: |
| case MachOTLVPage21: { |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| uint32_t Instr = *(const ulittle32_t *)FixupContent; |
| if ((Instr & 0xffffffe0) != 0x90000000) |
| return make_error<JITLinkError>("PAGE21/GOTPAGE21 target is not an " |
| "ADRP instruction with a zero " |
| "addend"); |
| |
| if (*MachORelocKind == MachOPage21) { |
| Kind = aarch64::Page21; |
| } else if (*MachORelocKind == MachOGOTPage21) { |
| Kind = aarch64::RequestGOTAndTransformToPage21; |
| } else if (*MachORelocKind == MachOTLVPage21) { |
| Kind = aarch64::RequestTLVPAndTransformToPage21; |
| } |
| break; |
| } |
| case MachOPageOffset12: { |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| uint32_t Instr = *(const ulittle32_t *)FixupContent; |
| uint32_t EncodedAddend = (Instr & 0x003FFC00) >> 10; |
| if (EncodedAddend != 0) |
| return make_error<JITLinkError>("GOTPAGEOFF12 target has non-zero " |
| "encoded addend"); |
| Kind = aarch64::PageOffset12; |
| break; |
| } |
| case MachOGOTPageOffset12: |
| case MachOTLVPageOffset12: { |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| uint32_t Instr = *(const ulittle32_t *)FixupContent; |
| if ((Instr & 0xfffffc00) != 0xf9400000) |
| return make_error<JITLinkError>("GOTPAGEOFF12 target is not an LDR " |
| "immediate instruction with a zero " |
| "addend"); |
| |
| if (*MachORelocKind == MachOGOTPageOffset12) { |
| Kind = aarch64::RequestGOTAndTransformToPageOffset12; |
| } else if (*MachORelocKind == MachOTLVPageOffset12) { |
| Kind = aarch64::RequestTLVPAndTransformToPageOffset12; |
| } |
| break; |
| } |
| case MachOPointerToGOT: |
| if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) |
| TargetSymbol = TargetSymbolOrErr->GraphSymbol; |
| else |
| return TargetSymbolOrErr.takeError(); |
| |
| Kind = aarch64::RequestGOTAndTransformToDelta32; |
| break; |
| case MachODelta32: |
| case MachODelta64: { |
| // We use Delta32/Delta64 to represent SUBTRACTOR relocations. |
| // parsePairRelocation handles the paired reloc, and returns the |
| // edge kind to be used (either Delta32/Delta64, or |
| // NegDelta32/NegDelta64, depending on the direction of the |
| // subtraction) along with the addend. |
| auto PairInfo = |
| parsePairRelocation(*BlockToFix, *MachORelocKind, RI, |
| FixupAddress, FixupContent, ++RelItr, RelEnd); |
| if (!PairInfo) |
| return PairInfo.takeError(); |
| std::tie(Kind, TargetSymbol, Addend) = *PairInfo; |
| assert(TargetSymbol && "No target symbol from parsePairRelocation?"); |
| break; |
| } |
| default: |
| llvm_unreachable("Special relocation kind should not appear in " |
| "mach-o file"); |
| } |
| |
| LLVM_DEBUG({ |
| dbgs() << " "; |
| Edge GE(Kind, FixupAddress - BlockToFix->getAddress(), *TargetSymbol, |
| Addend); |
| printEdge(dbgs(), *BlockToFix, GE, aarch64::getEdgeKindName(Kind)); |
| dbgs() << "\n"; |
| }); |
| BlockToFix->addEdge(Kind, FixupAddress - BlockToFix->getAddress(), |
| *TargetSymbol, Addend); |
| } |
| } |
| return Error::success(); |
| } |
| |
| /// Return the string name of the given MachO arm64 edge kind. |
| const char *getMachOARM64RelocationKindName(Edge::Kind R) { |
| switch (R) { |
| case MachOBranch26: |
| return "MachOBranch26"; |
| case MachOPointer64: |
| return "MachOPointer64"; |
| case MachOPointer64Anon: |
| return "MachOPointer64Anon"; |
| case MachOPage21: |
| return "MachOPage21"; |
| case MachOPageOffset12: |
| return "MachOPageOffset12"; |
| case MachOGOTPage21: |
| return "MachOGOTPage21"; |
| case MachOGOTPageOffset12: |
| return "MachOGOTPageOffset12"; |
| case MachOTLVPage21: |
| return "MachOTLVPage21"; |
| case MachOTLVPageOffset12: |
| return "MachOTLVPageOffset12"; |
| case MachOPointerToGOT: |
| return "MachOPointerToGOT"; |
| case MachOPairedAddend: |
| return "MachOPairedAddend"; |
| case MachOLDRLiteral19: |
| return "MachOLDRLiteral19"; |
| case MachODelta32: |
| return "MachODelta32"; |
| case MachODelta64: |
| return "MachODelta64"; |
| case MachONegDelta32: |
| return "MachONegDelta32"; |
| case MachONegDelta64: |
| return "MachONegDelta64"; |
| default: |
| return getGenericEdgeKindName(static_cast<Edge::Kind>(R)); |
| } |
| } |
| |
| unsigned NumSymbols = 0; |
| }; |
| |
| } // namespace |
| |
| namespace llvm { |
| namespace jitlink { |
| |
| Error buildTables_MachO_arm64(LinkGraph &G) { |
| LLVM_DEBUG(dbgs() << "Visiting edges in graph:\n"); |
| |
| aarch64::GOTTableManager GOT; |
| aarch64::PLTTableManager PLT(GOT); |
| visitExistingEdges(G, GOT, PLT); |
| return Error::success(); |
| } |
| |
| class MachOJITLinker_arm64 : public JITLinker<MachOJITLinker_arm64> { |
| friend class JITLinker<MachOJITLinker_arm64>; |
| |
| public: |
| MachOJITLinker_arm64(std::unique_ptr<JITLinkContext> Ctx, |
| std::unique_ptr<LinkGraph> G, |
| PassConfiguration PassConfig) |
| : JITLinker(std::move(Ctx), std::move(G), std::move(PassConfig)) {} |
| |
| private: |
| Error applyFixup(LinkGraph &G, Block &B, const Edge &E) const { |
| return aarch64::applyFixup(G, B, E, nullptr); |
| } |
| |
| uint64_t NullValue = 0; |
| }; |
| |
| Expected<std::unique_ptr<LinkGraph>> |
| createLinkGraphFromMachOObject_arm64(MemoryBufferRef ObjectBuffer) { |
| auto MachOObj = object::ObjectFile::createMachOObjectFile(ObjectBuffer); |
| if (!MachOObj) |
| return MachOObj.takeError(); |
| |
| auto Features = (*MachOObj)->getFeatures(); |
| if (!Features) |
| return Features.takeError(); |
| |
| return MachOLinkGraphBuilder_arm64(**MachOObj, std::move(*Features)) |
| .buildGraph(); |
| } |
| |
| void link_MachO_arm64(std::unique_ptr<LinkGraph> G, |
| std::unique_ptr<JITLinkContext> Ctx) { |
| |
| PassConfiguration Config; |
| |
| if (Ctx->shouldAddDefaultTargetPasses(G->getTargetTriple())) { |
| // Add a mark-live pass. |
| if (auto MarkLive = Ctx->getMarkLivePass(G->getTargetTriple())) |
| Config.PrePrunePasses.push_back(std::move(MarkLive)); |
| else |
| Config.PrePrunePasses.push_back(markAllSymbolsLive); |
| |
| // Add compact unwind splitter pass. |
| Config.PrePrunePasses.push_back( |
| CompactUnwindSplitter("__LD,__compact_unwind")); |
| |
| // Add eh-frame passes. |
| // FIXME: Prune eh-frames for which compact-unwind is available once |
| // we support compact-unwind registration with libunwind. |
| Config.PrePrunePasses.push_back(createEHFrameSplitterPass_MachO_arm64()); |
| Config.PrePrunePasses.push_back(createEHFrameEdgeFixerPass_MachO_arm64()); |
| |
| // Resolve any external section start / end symbols. |
| Config.PostAllocationPasses.push_back( |
| createDefineExternalSectionStartAndEndSymbolsPass( |
| identifyMachOSectionStartAndEndSymbols)); |
| |
| // Add an in-place GOT/Stubs pass. |
| Config.PostPrunePasses.push_back(buildTables_MachO_arm64); |
| } |
| |
| if (auto Err = Ctx->modifyPassConfig(*G, Config)) |
| return Ctx->notifyFailed(std::move(Err)); |
| |
| // Construct a JITLinker and run the link function. |
| MachOJITLinker_arm64::link(std::move(Ctx), std::move(G), std::move(Config)); |
| } |
| |
| LinkGraphPassFunction createEHFrameSplitterPass_MachO_arm64() { |
| return DWARFRecordSectionSplitter("__TEXT,__eh_frame"); |
| } |
| |
| LinkGraphPassFunction createEHFrameEdgeFixerPass_MachO_arm64() { |
| return EHFrameEdgeFixer("__TEXT,__eh_frame", aarch64::PointerSize, |
| aarch64::Pointer32, aarch64::Pointer64, |
| aarch64::Delta32, aarch64::Delta64, |
| aarch64::NegDelta32); |
| } |
| |
| } // end namespace jitlink |
| } // end namespace llvm |
