1 //===- RelocationFactory.cpp ----------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #include <mcld/LD/RelocationFactory.h> 10 #include <mcld/Target/GOT.h> 11 #include <mcld/Target/TargetLDBackend.h> 12 #include <llvm/Support/Host.h> 13 #include <cstring> 14 #include <cassert> 15 16 using namespace mcld; 17 18 //========================== 19 // RelocationFactory 20 RelocationFactory::RelocationFactory(size_t pNum) 21 : GCFactory<Relocation, 0>(pNum), 22 m_pLayout(NULL) { 23 } 24 25 RelocationFactory::~RelocationFactory() 26 { 27 } 28 29 Relocation* RelocationFactory::produce(RelocationFactory::Type pType, 30 MCFragmentRef& pFragRef, 31 Address pAddend) 32 { 33 // target_data is the place where the relocation applys to. 34 // Use TargetDataFactory to generate temporary data, and copy the 35 // content of the fragment into this data. 36 DWord target_data = 0; 37 38 // byte swapping if the host and target have different endian 39 if(llvm::sys::isLittleEndianHost() != getTarget().isLittleEndian()) { 40 uint32_t tmp_data; 41 42 switch(getTarget().bitclass()) { 43 case 32u: 44 pFragRef.memcpy(&tmp_data, 4); 45 tmp_data = bswap32(tmp_data); 46 target_data = tmp_data; 47 break; 48 49 case 64u: 50 pFragRef.memcpy(&target_data, 8); 51 target_data = bswap64(target_data); 52 break; 53 54 default: 55 break; 56 } 57 } 58 else { 59 pFragRef.memcpy(&target_data, (getTarget().bitclass()/8)); 60 } 61 62 Relocation *result = allocate(); 63 new (result) Relocation(pType, &pFragRef, pAddend, target_data); 64 return result; 65 } 66 67 Relocation* RelocationFactory::produceEmptyEntry() 68 { 69 // FIXME: To prevent relocations from double free by both iplist and 70 // GCFactory, currently we new relocations directly and let iplist 71 // delete them. 72 73 return new Relocation(0, 0, 0, 0); 74 } 75 76 void RelocationFactory::destroy(Relocation* pRelocation) 77 { 78 /** GCFactory will recycle the relocation **/ 79 } 80 81 void RelocationFactory::setLayout(const Layout& pLayout) 82 { 83 m_pLayout = &pLayout; 84 } 85 86 const Layout& RelocationFactory::getLayout() const 87 { 88 assert(0 != m_pLayout); 89 return *m_pLayout; 90 } 91 92
