1 //===-- llvm/MC/MCObjectSymbolizer.h --------------------------------------===// 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 // This file declares the MCObjectSymbolizer class, an MCSymbolizer that is 11 // backed by an object::ObjectFile. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_MC_MCOBJECTSYMBOLIZER_H 16 #define LLVM_MC_MCOBJECTSYMBOLIZER_H 17 18 #include "llvm/ADT/DenseMap.h" 19 #include "llvm/MC/MCSymbolizer.h" 20 #include "llvm/Object/ObjectFile.h" 21 #include <vector> 22 23 namespace llvm { 24 25 class MCExpr; 26 class MCInst; 27 class MCRelocationInfo; 28 class raw_ostream; 29 30 /// \brief An ObjectFile-backed symbolizer. 31 class MCObjectSymbolizer : public MCSymbolizer { 32 protected: 33 const object::ObjectFile *Obj; 34 35 typedef DenseMap<uint64_t, object::RelocationRef> AddrToRelocMap; 36 typedef std::vector<object::SectionRef> SortedSectionList; 37 SortedSectionList SortedSections; 38 39 // Map a load address to the first relocation that applies there. As far as I 40 // know, if there are several relocations at the exact same address, they are 41 // related and the others can be determined from the first that was found in 42 // the relocation table. For instance, on x86-64 mach-o, a SUBTRACTOR 43 // relocation (referencing the minuend symbol) is followed by an UNSIGNED 44 // relocation (referencing the subtrahend symbol). 45 AddrToRelocMap AddrToReloc; 46 47 // Helpers around SortedSections. 48 SortedSectionList::const_iterator findSectionContaining(uint64_t Addr) const; 49 void insertSection(object::SectionRef Section); 50 51 52 MCObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo, 53 const object::ObjectFile *Obj); 54 55 public: 56 /// \name Overridden MCSymbolizer methods: 57 /// @{ 58 bool tryAddingSymbolicOperand(MCInst &MI, raw_ostream &cStream, 59 int64_t Value, 60 uint64_t Address, bool IsBranch, 61 uint64_t Offset, uint64_t InstSize); 62 63 void tryAddingPcLoadReferenceComment(raw_ostream &cStream, 64 int64_t Value, uint64_t Address); 65 /// @} 66 67 /// \brief Create an object symbolizer for \p Obj. 68 static MCObjectSymbolizer * 69 createObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo, 70 const object::ObjectFile *Obj); 71 }; 72 73 } 74 75 #endif 76
