| //===-- llvm/MC/MCObjectSymbolizer.h --------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file declares the MCObjectSymbolizer class, an MCSymbolizer that is |
| // backed by an object::ObjectFile. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_MC_MCOBJECTSYMBOLIZER_H |
| #define LLVM_MC_MCOBJECTSYMBOLIZER_H |
| |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/MC/MCSymbolizer.h" |
| #include "llvm/Object/ObjectFile.h" |
| #include <vector> |
| |
| namespace llvm { |
| |
| class MCExpr; |
| class MCInst; |
| class MCRelocationInfo; |
| class raw_ostream; |
| |
| /// \brief An ObjectFile-backed symbolizer. |
| class MCObjectSymbolizer : public MCSymbolizer { |
| protected: |
| const object::ObjectFile *Obj; |
| |
| // Map a load address to the first relocation that applies there. As far as I |
| // know, if there are several relocations at the exact same address, they are |
| // related and the others can be determined from the first that was found in |
| // the relocation table. For instance, on x86-64 mach-o, a SUBTRACTOR |
| // relocation (referencing the minuend symbol) is followed by an UNSIGNED |
| // relocation (referencing the subtrahend symbol). |
| const object::RelocationRef *findRelocationAt(uint64_t Addr); |
| const object::SectionRef *findSectionContaining(uint64_t Addr); |
| |
| MCObjectSymbolizer(MCContext &Ctx, std::unique_ptr<MCRelocationInfo> RelInfo, |
| const object::ObjectFile *Obj); |
| |
| public: |
| /// \name Overridden MCSymbolizer methods: |
| /// @{ |
| bool tryAddingSymbolicOperand(MCInst &MI, raw_ostream &cStream, |
| int64_t Value, uint64_t Address, |
| bool IsBranch, uint64_t Offset, |
| uint64_t InstSize) override; |
| |
| void tryAddingPcLoadReferenceComment(raw_ostream &cStream, |
| int64_t Value, |
| uint64_t Address) override; |
| /// @} |
| |
| /// \brief Look for an external function symbol at \p Addr. |
| /// (References through the ELF PLT, Mach-O stubs, and similar). |
| /// \returns An MCExpr representing the external symbol, or 0 if not found. |
| virtual StringRef findExternalFunctionAt(uint64_t Addr); |
| |
| /// \brief Create an object symbolizer for \p Obj. |
| static MCObjectSymbolizer * |
| createObjectSymbolizer(MCContext &Ctx, |
| std::unique_ptr<MCRelocationInfo> RelInfo, |
| const object::ObjectFile *Obj); |
| |
| private: |
| typedef DenseMap<uint64_t, object::RelocationRef> AddrToRelocMap; |
| typedef std::vector<object::SectionRef> SortedSectionList; |
| SortedSectionList SortedSections; |
| AddrToRelocMap AddrToReloc; |
| |
| void buildSectionList(); |
| void buildRelocationByAddrMap(); |
| }; |
| |
| } |
| |
| #endif |