MCDisassembler.h   [plain text]

//===-- llvm/MC/MCDisassembler.h - Disassembler interface -------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef MCDISASSEMBLER_H
#define MCDISASSEMBLER_H

#include "llvm/Support/DataTypes.h"
#include "llvm-c/Disassembler.h"

namespace llvm {
  
class MCInst;
class MemoryObject;
class raw_ostream;
class MCContext;
  
struct EDInstInfo;

/// MCDisassembler - Superclass for all disassemblers.  Consumes a memory region
///   and provides an array of assembly instructions.
class MCDisassembler {
public:
  /// Constructor     - Performs initial setup for the disassembler.
  MCDisassembler() : GetOpInfo(0), DisInfo(0), Ctx(0) {}
  
  virtual ~MCDisassembler();
  
  /// getInstruction  - Returns the disassembly of a single instruction.
  ///
  /// @param instr    - An MCInst to populate with the contents of the 
  ///                   instruction.
  /// @param size     - A value to populate with the size of the instruction, or
  ///                   the number of bytes consumed while attempting to decode
  ///                   an invalid instruction.
  /// @param region   - The memory object to use as a source for machine code.
  /// @param address  - The address, in the memory space of region, of the first
  ///                   byte of the instruction.
  /// @param vStream  - The stream to print warnings and diagnostic messages on.
  /// @return         - True if the instruction is valid; false otherwise.
  virtual bool          getInstruction(MCInst& instr,
                                       uint64_t& size,
                                       const MemoryObject &region,
                                       uint64_t address,
                                       raw_ostream &vStream) const = 0;

  /// getEDInfo - Returns the enhanced instruction information corresponding to
  ///   the disassembler.
  ///
  /// @return         - An array of instruction information, with one entry for
  ///                   each MCInst opcode this disassembler returns.
  ///                   NULL if there is no info for this target.
  virtual EDInstInfo   *getEDInfo() const { return (EDInstInfo*)0; }

private:
  //
  // Hooks for symbolic disassembly via the public 'C' interface.
  //
  // The function to get the symbolic information for operands.
  LLVMOpInfoCallback GetOpInfo;
  // The pointer to the block of symbolic information for above call back.
  void *DisInfo;
  // The assembly context for creating symbols and MCExprs in place of
  // immediate operands when there is symbolic information.
  MCContext *Ctx;

public:
  void setupForSymbolicDisassembly(LLVMOpInfoCallback getOpInfo,
                                   void *disInfo,
                                   MCContext *ctx) {
    GetOpInfo = getOpInfo;
    DisInfo = disInfo;
    Ctx = ctx;
  }
  LLVMOpInfoCallback getLLVMOpInfoCallback() const { return GetOpInfo; }
  void *getDisInfoBlock() const { return DisInfo; }
  MCContext *getMCContext() const { return Ctx; }
};

} // namespace llvm

#endif