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//===-- 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
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