nativeInstruction.hpp

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/* Copyright 1994 - 1996, LongView Technologies, L.L.C. $Revision: 1.4 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
All rights reserved.

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// The base class for differnt kinds of native instruction abstractions.
// Provides the primitive operations to manipulate code relative to this.

class NativeInstruction: ValueObj {
 protected:
  char* addr_at(int offset) const               { return (char*)this + offset; }

  char  char_at(int offset) const               { return *addr_at(offset); }
  int   long_at(int offset) const               { return *(int*)addr_at(offset); }
  oop   oop_at (int offset) const               { return *(oop*)addr_at(offset); }

  void  set_char_at(int offset, char c)         { *addr_at(offset) = c; }
  void  set_long_at(int offset, int  i)         { *(int*)addr_at(offset) = i; }
  void  set_oop_at (int offset, oop  o)         { *(oop*)addr_at(offset) = o; }
};


// An abstraction for accessing/manipulating native call imm32 instructions.
// (used to manipulate inline caches, primitive & dll calls, etc.)

class NativeCall: public NativeInstruction {
 public:
  enum Intel_specific_constants {
    instruction_code            = 0xE8,
    instruction_size            =    5,
    instruction_offset          =   -5,
    displacement_offset         =   -4,
    return_address_offset       =    0,
  };

  char* instruction_address() const             { return addr_at(instruction_offset); }
  char* next_instruction_address() const        { return addr_at(return_address_offset); }
  int   displacement() const                    { return long_at(displacement_offset); }
  char* return_address() const                  { return addr_at(return_address_offset); }
  char* destination() const                     { return return_address() + displacement(); }
  void  set_destination(char* dest)             { set_long_at(displacement_offset, dest - return_address()); }

  void  verify();
  void  print();
  
  // Creation
  friend NativeCall* nativeCall_at(char* address);
  friend NativeCall* nativeCall_from_return_address(char* return_address);
  friend NativeCall* nativeCall_from_relocInfo(char* displacement_address);
};


// An abstraction for accessing/manipulating native mov reg, imm32 instructions.
// (used to manipulate inlined 32bit data dll calls, etc.)

class NativeMov: public NativeInstruction {
 public:
  enum Intel_specific_constants {
    instruction_code            = 0xB8,
    instruction_size            =    5,
    instruction_offset          =    0,
    data_offset                 =    1,
    next_instruction_offset     =    5,
    register_mask               = 0x07,
  };

  char* instruction_address() const             { return addr_at(instruction_offset); }
  char* next_instruction_address() const        { return addr_at(next_instruction_offset); }
  int   data() const                            { return long_at(data_offset); }
  void  set_data(int x)                         { set_long_at(data_offset, x); }

  void  verify();
  void  print();
  
  // Creation
  friend NativeMov* nativeMov_at(char* address);
};



// An abstraction for accessing/manipulating native test eax, imm32 instructions.
// (used to manipulate inlined 32bit data for NLRs, dll calls, etc.)

class NativeTest: public NativeInstruction {
 public:
  enum Intel_specific_constants {
    instruction_code            = 0xA9,
    instruction_size            =    5,
    instruction_offset          =    0,
    data_offset                 =    1,
    next_instruction_offset     =    5,
  };

  char* instruction_address() const             { return addr_at(instruction_offset); }
  char* next_instruction_address() const        { return addr_at(next_instruction_offset); }
  int   data() const                            { return long_at(data_offset); }
  void  set_data(int x)                         { set_long_at(data_offset, x); }

  void  verify();
  void  print();
  
  // Creation
  friend NativeTest* nativeTest_at(char* address);

};


// An abstraction for accessing/manipulating native test eax, imm32 instructions that serve as IC info.

class IC_Info: public NativeTest {
 public:
  enum IC_Info_specific_constants {
    info_offset         = data_offset,
    number_of_flags     = 8,
    flags_mask          = (1 << number_of_flags) - 1,
  };

  char* NLR_target() const                      { return instruction_address() + (data() >> number_of_flags); }
  int   flags() const                           { return data() & flags_mask; }
  void  set_flags(int flags)                    { set_data((data() & ~flags_mask) | (flags & flags_mask)); }

  // Creation
  friend IC_Info* ic_info_at(char* address);
};

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