lib/Target/ARM/Disassembler/ARMDisassembler.h

   1 //===- ARMDisassembler.h - Disassembler for ARM/Thumb ISA -------*- 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 is part of the ARM Disassembler.
  11 // It contains the header for ARMDisassembler and ThumbDisassembler, both are
  12 // subclasses of MCDisassembler.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef ARMDISASSEMBLER_H
  17 #define ARMDISASSEMBLER_H
  18
  19 #include "llvm/MC/MCDisassembler.h"
  20
  21 namespace llvm {
  22
  23 class MCInst;
  24 class MemoryObject;
  25 class raw_ostream;
  26
  27 struct EDInstInfo;
  28
  29 /// ARMDisassembler - ARM disassembler for all ARM platforms.
  30 class ARMDisassembler : public MCDisassembler {
  31 public:
  32   /// Constructor     - Initializes the disassembler.
  33   ///
  34   ARMDisassembler() :
  35     MCDisassembler() {
  36   }
  37
  38   ~ARMDisassembler() {
  39   }
  40
  41   /// getInstruction - See MCDisassembler.
  42   bool getInstruction(MCInst &instr,
  43                       uint64_t &size,
  44                       const MemoryObject &region,
  45                       uint64_t address,
  46                       raw_ostream &vStream) const;
  47
  48   /// getEDInfo - See MCDisassembler.
  49   EDInstInfo *getEDInfo() const;
  50 private:
  51 };
  52
  53 // Forward declaration.
  54 class ARMBasicMCBuilder;
  55
  56 /// Session - Keep track of the IT Block progression.
  57 class Session {
  58   friend class ARMBasicMCBuilder;
  59 public:
  60   Session() : ITCounter(0), ITState(0) {}
  61   ~Session() {}
  62   /// InitIT - Initializes ITCounter/ITState.
  63   bool InitIT(unsigned short bits7_0);
  64   /// UpdateIT - Updates ITCounter/ITState as IT Block progresses.
  65   void UpdateIT();
  66
  67 private:
  68   unsigned ITCounter; // Possible values: 0, 1, 2, 3, 4.
  69   unsigned ITState;   // A2.5.2 Consists of IT[7:5] and IT[4:0] initially.
  70 };
  71
  72 /// ThumbDisassembler - Thumb disassembler for all ARM platforms.
  73 class ThumbDisassembler : public MCDisassembler {
  74 public:
  75   /// Constructor     - Initializes the disassembler.
  76   ///
  77   ThumbDisassembler() :
  78     MCDisassembler(), SO() {
  79   }
  80
  81   ~ThumbDisassembler() {
  82   }
  83
  84   /// getInstruction - See MCDisassembler.
  85   bool getInstruction(MCInst &instr,
  86                       uint64_t &size,
  87                       const MemoryObject &region,
  88                       uint64_t address,
  89                       raw_ostream &vStream) const;
  90
  91   /// getEDInfo - See MCDisassembler.
  92   EDInstInfo *getEDInfo() const;
  93 private:
  94   Session SO;
  95 };
  96
  97 } // namespace llvm
  98
  99 #endif