Mercurial > hg > truffle

comparison src/share/vm/runtime/relocator.hpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c18cbe5936b8
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
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 };