1 /*
2 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25
26 class JvmtiConstantPoolReconstituter : public StackObj {
27 private:
28 int _cpool_size;
29 SymbolHashMap* _symmap;
30 SymbolHashMap* _classmap;
31 constantPoolHandle _cpool;
32 instanceKlassHandle _ikh;
33 jvmtiError _err;
34
35 protected:
36 instanceKlassHandle ikh() { return _ikh; };
37 constantPoolHandle cpool() { return _cpool; };
38
39 u2 symbol_to_cpool_index(symbolOop sym) {
40 return _symmap->symbol_to_value(sym);
41 }
42
43 u2 class_symbol_to_cpool_index(symbolOop sym) {
44 return _classmap->symbol_to_value(sym);
45 }
46
47 public:
48 // Calls to this constructor must be proceeded by a ResourceMark
49 // and a HandleMark
50 JvmtiConstantPoolReconstituter(instanceKlassHandle ikh){
51 set_error(JVMTI_ERROR_NONE);
52 _ikh = ikh;
53 _cpool = constantPoolHandle(Thread::current(), ikh->constants());
54 _symmap = new SymbolHashMap();
55 _classmap = new SymbolHashMap();
56 _cpool_size = _cpool->hash_entries_to(_symmap, _classmap);
57 if (_cpool_size == 0) {
58 set_error(JVMTI_ERROR_OUT_OF_MEMORY);
59 } else if (_cpool_size < 0) {
60 set_error(JVMTI_ERROR_INTERNAL);
61 }
62 }
63
64 ~JvmtiConstantPoolReconstituter() {
65 if (_symmap != NULL) {
66 os::free(_symmap);
67 _symmap = NULL;
68 }
69 if (_classmap != NULL) {
70 os::free(_classmap);
71 _classmap = NULL;
72 }
73 }
74
75
76 void set_error(jvmtiError err) { _err = err; }
77 jvmtiError get_error() { return _err; }
78
79 int cpool_size() { return _cpool_size; }
80
81 void copy_cpool_bytes(unsigned char *cpool_bytes) {
82 if (cpool_bytes == NULL) {
83 assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL");
84 return;
85 }
86 cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes);
87 }
88 };
89
90
91 class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter {
92 private:
93 size_t _buffer_size;
94 u1* _buffer;
95 u1* _buffer_ptr;
96 Thread* _thread;
97
98 enum {
99 // initial size should be power of two
100 initial_buffer_size = 1024
101 };
102
103 inline Thread* thread() { return _thread; }
104
105 void write_class_file_format();
106 void write_field_infos();
107 void write_method_infos();
108 void write_method_info(methodHandle method);
109 void write_code_attribute(methodHandle method);
110 void write_exceptions_attribute(constMethodHandle const_method);
111 void write_synthetic_attribute();
112 void write_class_attributes();
113 void write_source_file_attribute();
114 void write_source_debug_extension_attribute();
115 u2 line_number_table_entries(methodHandle method);
116 void write_line_number_table_attribute(methodHandle method, u2 num_entries);
117 void write_stackmap_table_attribute(methodHandle method, int stackmap_table_len);
118 u2 inner_classes_attribute_length();
119 void write_inner_classes_attribute(int length);
120 void write_signature_attribute(u2 generic_signaure_index);
121 void write_attribute_name_index(const char* name);
122 void write_annotations_attribute(const char* attr_name, typeArrayHandle annos);
123
124 address writeable_address(size_t size);
125 void write_u1(u1 x);
126 void write_u2(u2 x);
127 void write_u4(u4 x);
128 void write_u8(u8 x);
129
130 public:
131 // Calls to this constructor must be proceeded by a ResourceMark
132 // and a HandleMark
133 JvmtiClassFileReconstituter(instanceKlassHandle ikh) :
134 JvmtiConstantPoolReconstituter(ikh) {
135 _buffer_size = initial_buffer_size;
136 _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size);
137 _thread = Thread::current();
138 write_class_file_format();
139 };
140
141 size_t class_file_size() { return _buffer_ptr - _buffer; }
142
143 u1* class_file_bytes() { return _buffer; }
144
145 static void copy_bytecodes(methodHandle method, unsigned char* bytecodes);
146 };