lib/MC/MCDisassembler/EDOperand.h

   1 //===-EDOperand.h - LLVM Enhanced Disassembler ------------------*- 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 defines the interface for the Enhanced Disassembly library's
  11 // operand class.  The operand is responsible for allowing evaluation given a
  12 // particular register context.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef LLVM_EDOPERAND_H
  17 #define LLVM_EDOPERAND_H
  18
  19 #include "llvm/Support/DataTypes.h"
  20
  21 namespace llvm {
  22
  23 struct EDDisassembler;
  24 struct EDInst;
  25
  26 typedef int (*EDRegisterReaderCallback)(uint64_t *value, unsigned regID,
  27                                         void* arg);
  28
  29
  30 /// EDOperand - Encapsulates a single operand, which can be evaluated by the
  31 ///   client
  32 struct EDOperand {
  33   /// The parent disassembler
  34   const EDDisassembler &Disassembler;
  35   /// The parent instruction
  36   const EDInst &Inst;
  37
  38   /// The index of the operand in the EDInst
  39   unsigned int OpIndex;
  40   /// The index of the first component of the operand in the MCInst
  41   unsigned int MCOpIndex;
  42
  43   /// Constructor - Initializes an EDOperand
  44   ///
  45   /// @arg disassembler - The disassembler responsible for the operand
  46   /// @arg inst         - The instruction containing this operand
  47   /// @arg opIndex      - The index of the operand in inst
  48   /// @arg mcOpIndex    - The index of the operand in the original MCInst
  49   EDOperand(const EDDisassembler &disassembler,
  50             const EDInst &inst,
  51             unsigned int opIndex,
  52             unsigned int &mcOpIndex);
  53   ~EDOperand();
  54
  55   /// evaluate - Returns the numeric value of an operand to the extent possible,
  56   ///   returning 0 on success or -1 if there was some problem (such as a
  57   ///   register not being readable)
  58   ///
  59   /// @arg result   - A reference whose target is filled in with the value of
  60   ///                 the operand (the address if it is a memory operand)
  61   /// @arg callback - A function to call to obtain register values
  62   /// @arg arg      - An opaque argument to pass to callback
  63   int evaluate(uint64_t &result,
  64                EDRegisterReaderCallback callback,
  65                void *arg);
  66
  67   /// isRegister - Returns 1 if the operand is a register or 0 otherwise
  68   int isRegister();
  69   /// regVal - Returns the register value.
  70   unsigned regVal();
  71
  72   /// isImmediate - Returns 1 if the operand is an immediate or 0 otherwise
  73   int isImmediate();
  74   /// immediateVal - Returns the immediate value.
  75   uint64_t immediateVal();
  76
  77   /// isMemory - Returns 1 if the operand is a memory location or 0 otherwise
  78   int isMemory();
  79
  80 #ifdef __BLOCKS__
  81   typedef int (^EDRegisterBlock_t)(uint64_t *value, unsigned regID);
  82
  83   /// evaluate - Like evaluate for a callback, but uses a block instead
  84   int evaluate(uint64_t &result,
  85                EDRegisterBlock_t regBlock);
  86 #endif
  87 };
  88
  89 } // end namespace llvm
  90
  91 #endif