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1 /*
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2 * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // This code has been converted from the 1.1E java virtual machine
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26 // Thanks to the JavaTopics group for using the code
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27
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28 class ChangeItem;
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29
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30 // Callback object for code relocations
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31 class RelocatorListener : public StackObj {
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32 public:
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33 RelocatorListener() {};
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34 virtual void relocated(int bci, int delta, int new_method_size) = 0;
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35 };
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36
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37
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38 class Relocator : public ResourceObj {
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39 public:
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40 Relocator(methodHandle method, RelocatorListener* listener);
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41 methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);
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42
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43 // Callbacks from ChangeItem's
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44 bool handle_code_changes();
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45 bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions
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46 void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps
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47 bool handle_jump_widen (int bci, int delta); // handles jumps
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48 bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches
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49
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50 private:
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51 unsigned char* _code_array;
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52 int _code_array_length;
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53 int _code_length;
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54 unsigned char* _compressed_line_number_table;
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55 int _compressed_line_number_table_size;
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56 methodHandle _method;
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57 u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions
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58
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59 GrowableArray<ChangeItem*>* _changes;
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60
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61 unsigned char* code_array() const { return _code_array; }
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62 void set_code_array(unsigned char* array) { _code_array = array; }
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63
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64 int code_length() const { return _code_length; }
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65 void set_code_length(int length) { _code_length = length; }
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66
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67 int code_array_length() const { return _code_array_length; }
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68 void set_code_array_length(int length) { _code_array_length = length; }
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69
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70 unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; }
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71 void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }
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72
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73 int compressed_line_number_table_size() const { return _compressed_line_number_table_size; }
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74 void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; }
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75
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76 methodHandle method() const { return _method; }
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77 void set_method(methodHandle method) { _method = method; }
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78
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79 // This will return a raw bytecode, which is possibly rewritten.
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80 Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; }
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81 void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }
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82
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83 // get and set signed integers in the code_array
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84 inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); }
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85 inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); }
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86
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87 // get and set signed shorts in the code_array
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88 inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); }
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89 inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }
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90
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91 // get the address of in the code_array
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92 inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; }
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93
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94 int instruction_length_at(int bci) { return Bytecodes::length_at(code_array() + bci); }
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95
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96 // Helper methods
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97 int align(int n) const { return (n+3) & ~3; }
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98 int code_slop_pct() const { return 25; }
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99 bool is_opcode_lookupswitch(Bytecodes::Code bc);
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100
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101 // basic relocation methods
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102 bool relocate_code (int bci, int ilen, int delta);
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103 void change_jumps (int break_bci, int delta);
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104 void change_jump (int bci, int offset, bool is_short, int break_bci, int delta);
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105 void adjust_exception_table(int bci, int delta);
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106 void adjust_line_no_table (int bci, int delta);
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107 void adjust_local_var_table(int bci, int delta);
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108 int get_orig_switch_pad (int bci, bool is_lookup_switch);
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109 int rc_instr_len (int bci);
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110 bool expand_code_array (int delta);
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111
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112 // Callback support
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113 RelocatorListener *_listener;
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114 void notify(int bci, int delta, int new_code_length) {
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115 if (_listener != NULL)
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116 _listener->relocated(bci, delta, new_code_length);
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117 }
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118 };
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