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