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      1 //===-- llvm/MC/MCAtom.h - MCAtom class ---------------------*- C++ -*-===//
      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 contains the declaration of the MCAtom class, which is used to
     11 // represent a contiguous region in a decoded object that is uniformly data or
     12 // instructions;
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_MC_MCATOM_H
     17 #define LLVM_MC_MCATOM_H
     18 
     19 #include "llvm/MC/MCInst.h"
     20 #include "llvm/Support/DataTypes.h"
     21 #include <vector>
     22 
     23 namespace llvm {
     24 
     25 class MCModule;
     26 
     27 /// MCData - An entry in a data MCAtom.
     28 // NOTE: This may change to a more complex type in the future.
     29 typedef uint8_t MCData;
     30 
     31 /// MCAtom - Represents a contiguous range of either instructions (a TextAtom)
     32 /// or data (a DataAtom).  Address ranges are expressed as _closed_ intervals.
     33 class MCAtom {
     34   friend class MCModule;
     35   typedef enum { TextAtom, DataAtom } AtomType;
     36 
     37   AtomType Type;
     38   MCModule *Parent;
     39   uint64_t Begin, End;
     40 
     41   std::vector<std::pair<uint64_t, MCInst> > Text;
     42   std::vector<MCData> Data;
     43 
     44   // Private constructor - only callable by MCModule
     45   MCAtom(AtomType T, MCModule *P, uint64_t B, uint64_t E)
     46     : Type(T), Parent(P), Begin(B), End(E) { }
     47 
     48 public:
     49   bool isTextAtom() { return Type == TextAtom; }
     50   bool isDataAtom() { return Type == DataAtom; }
     51 
     52   void addInst(const MCInst &I, uint64_t Address, unsigned Size);
     53   void addData(const MCData &D);
     54 
     55   /// split - Splits the atom in two at a given address, which must align with
     56   /// and instruction boundary if this is a TextAtom.  Returns the newly created
     57   /// atom representing the high part of the split.
     58   MCAtom *split(uint64_t SplitPt);
     59 
     60   /// truncate - Truncates an atom so that TruncPt is the last byte address
     61   /// contained in the atom.
     62   void truncate(uint64_t TruncPt);
     63 };
     64 
     65 }
     66 
     67 #endif
     68 
     69