1 //===-------------- MachO.cpp - JIT linker function for MachO -------------===// 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 // MachO jit-link function. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ExecutionEngine/JITLink/MachO.h" 15 16 #include "llvm/BinaryFormat/MachO.h" 17 #include "llvm/ExecutionEngine/JITLink/MachO_x86_64.h" 18 #include "llvm/Support/Endian.h" 19 #include "llvm/Support/Format.h" 20 #include "llvm/Support/MemoryBuffer.h" 21 22 using namespace llvm; 23 24 #define DEBUG_TYPE "jitlink" 25 26 namespace llvm { 27 namespace jitlink { 28 29 void jitLink_MachO(std::unique_ptr<JITLinkContext> Ctx) { 30 31 // We don't want to do full MachO validation here. Just parse enough of the 32 // header to find out what MachO linker to use. 33 34 StringRef Data = Ctx->getObjectBuffer().getBuffer(); 35 if (Data.size() < 4) { 36 Ctx->notifyFailed(make_error<JITLinkError>("Truncated MachO buffer")); 37 return; 38 } 39 40 uint32_t Magic; 41 memcpy(&Magic, Data.data(), sizeof(uint32_t)); 42 LLVM_DEBUG({ 43 dbgs() << "jitLink_MachO: magic = " << format("0x%08" PRIx32, Magic) 44 << "\n"; 45 }); 46 47 if (Magic == MachO::MH_MAGIC || Magic == MachO::MH_CIGAM) { 48 Ctx->notifyFailed( 49 make_error<JITLinkError>("MachO 32-bit platforms not supported")); 50 return; 51 } else if (Magic == MachO::MH_MAGIC_64 || Magic == MachO::MH_CIGAM_64) { 52 MachO::mach_header_64 Header; 53 54 memcpy(&Header, Data.data(), sizeof(MachO::mach_header_64)); 55 if (Magic == MachO::MH_CIGAM_64) 56 swapStruct(Header); 57 58 LLVM_DEBUG({ 59 dbgs() << "jitLink_MachO: cputype = " 60 << format("0x%08" PRIx32, Header.cputype) 61 << ", cpusubtype = " << format("0x%08" PRIx32, Header.cpusubtype) 62 << "\n"; 63 }); 64 65 switch (Header.cputype) { 66 case MachO::CPU_TYPE_X86_64: 67 return jitLink_MachO_x86_64(std::move(Ctx)); 68 } 69 Ctx->notifyFailed(make_error<JITLinkError>("MachO-64 CPU type not valid")); 70 return; 71 } 72 73 Ctx->notifyFailed(make_error<JITLinkError>("MachO magic not valid")); 74 } 75 76 } // end namespace jitlink 77 } // end namespace llvm 78