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 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

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  */

 #ifndef SHARE_VM_RUNTIME_RELOCATOR_HPP

 #define SHARE_VM_RUNTIME_RELOCATOR_HPP

 #include "interpreter/bytecodes.hpp"

 #include "oops/methodOop.hpp"

 #ifdef TARGET_ARCH_x86

 # include "bytes_x86.hpp"

 #endif

 #ifdef TARGET_ARCH_sparc

 # include "bytes_sparc.hpp"

 #endif

 #ifdef TARGET_ARCH_zero

 # include "bytes_zero.hpp"

 #endif

 // This code has been converted from the 1.1E java virtual machine

 // Thanks to the JavaTopics group for using the code

 class ChangeItem;

 // Callback object for code relocations

 class RelocatorListener : public StackObj {

  public:

   RelocatorListener() {};

   virtual void relocated(int bci, int delta, int new_method_size) = 0;

 };

 class Relocator : public ResourceObj {

  public:

   Relocator(methodHandle method, RelocatorListener* listener);

   methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);

   // Callbacks from ChangeItem's

   bool handle_code_changes();

   bool handle_widen       (int bci, int new_ilen, u_char inst_buffer[]);  // handles general instructions

   void push_jump_widen  (int bci, int delta, int new_delta);    // pushes jumps

   bool handle_jump_widen  (int bci, int delta);     // handles jumps

   bool handle_switch_pad  (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches

  private:

   unsigned char* _code_array;

   int            _code_array_length;

   int            _code_length;

   unsigned char* _compressed_line_number_table;

   int            _compressed_line_number_table_size;

   methodHandle   _method;

   u_char         _overwrite[3];             // stores overwritten bytes for shrunken instructions

   GrowableArray<ChangeItem*>* _changes;

   unsigned char* code_array() const         { return _code_array; }

   void set_code_array(unsigned char* array) { _code_array = array; }

   int code_length() const                   { return _code_length; }

   void set_code_length(int length)          { _code_length = length; }

   int code_array_length() const             { return _code_array_length; }

   void set_code_array_length(int length)    { _code_array_length = length; }

   unsigned char* compressed_line_number_table() const         { return _compressed_line_number_table; }

   void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }

   int compressed_line_number_table_size() const               { return _compressed_line_number_table_size; }

   void set_compressed_line_number_table_size(int size)        { _compressed_line_number_table_size = size; }

   methodHandle method() const               { return _method; }

   void set_method(methodHandle method)      { _method = method; }

   // This will return a raw bytecode, which is possibly rewritten.

   Bytecodes::Code code_at(int bci) const          { return (Bytecodes::Code) code_array()[bci]; }

   void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }

   // get and set signed integers in the code_array

   inline int   int_at(int bci) const               { return Bytes::get_Java_u4(&code_array()[bci]); }

   inline void  int_at_put(int bci, int value)      { Bytes::put_Java_u4(&code_array()[bci], value); }

   // get and set signed shorts in the code_array

   inline short short_at(int bci) const            { return (short)Bytes::get_Java_u2(&code_array()[bci]); }

   inline void  short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }

   // get the address of in the code_array

   inline char* addr_at(int bci) const             { return (char*) &code_array()[bci]; }

   int  instruction_length_at(int bci)             { return Bytecodes::length_at(code_array() + bci); }

   // Helper methods

   int  align(int n) const                          { return (n+3) & ~3; }

   int  code_slop_pct() const                       { return 25; }

   bool is_opcode_lookupswitch(Bytecodes::Code bc);

   // basic relocation methods

   bool relocate_code         (int bci, int ilen, int delta);

   void change_jumps          (int break_bci, int delta);

   void change_jump           (int bci, int offset, bool is_short, int break_bci, int delta);

   void adjust_exception_table(int bci, int delta);

   void adjust_line_no_table  (int bci, int delta);

   void adjust_local_var_table(int bci, int delta);

   void adjust_stack_map_table(int bci, int delta);

   int  get_orig_switch_pad   (int bci, bool is_lookup_switch);

   int  rc_instr_len          (int bci);

   bool expand_code_array     (int delta);

   // Callback support

   RelocatorListener *_listener;

   void notify(int bci, int delta, int new_code_length) {

     if (_listener != NULL)

       _listener->relocated(bci, delta, new_code_length);

   }

 };

 #endif // SHARE_VM_RUNTIME_RELOCATOR_HPP