1 /*
2 * Copyright (c) 2005, 2024, 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 #ifndef SHARE_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
26 #define SHARE_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
27
28 #include "jvmtifiles/jvmtiEnv.hpp"
29 #include "oops/constantPool.hpp"
30
31
32 class JvmtiConstantPoolReconstituter : public StackObj {
33 private:
34 int _cpool_size;
35 ConstantPool::SymbolHash* _symmap;
36 ConstantPool::SymbolHash* _classmap;
37 constantPoolHandle _cpool;
38 InstanceKlass* _ik;
39 jvmtiError _err;
40
41 protected:
42 InstanceKlass* ik() { return _ik; };
43 constantPoolHandle cpool() { return _cpool; };
44
45 u2 symbol_to_cpool_index(Symbol* sym) {
46 return _symmap->symbol_to_value(sym);
47 }
48
49 u2 class_symbol_to_cpool_index(Symbol* sym) {
50 return _classmap->symbol_to_value(sym);
51 }
52
53 public:
54 // Calls to this constructor must be proceeded by a ResourceMark
55 // and a HandleMark
56 JvmtiConstantPoolReconstituter(InstanceKlass* ik);
57
58 ~JvmtiConstantPoolReconstituter() {
59 if (_symmap != nullptr) {
60 delete _symmap;
61 _symmap = nullptr;
62 }
63 if (_classmap != nullptr) {
64 delete _classmap;
65 _classmap = nullptr;
66 }
67 }
68
69
70 void set_error(jvmtiError err) { _err = err; }
71 jvmtiError get_error() { return _err; }
72
73 int cpool_size() { return _cpool_size; }
74
75 void copy_cpool_bytes(unsigned char *cpool_bytes) {
76 if (cpool_bytes == nullptr) {
77 assert(cpool_bytes != nullptr, "cpool_bytes pointer must not be null");
78 return;
79 }
80 cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes);
81 }
82 };
83
84
85 class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter {
86 private:
87 size_t _buffer_size;
88 u1* _buffer;
89 u1* _buffer_ptr;
90 Thread* _thread;
91
92 enum {
93 // initial size should be power of two
94 initial_buffer_size = 1024
95 };
96
97 inline Thread* thread() { return _thread; }
98
99 void write_class_file_format();
100 void write_field_infos();
101 void write_method_infos();
102 void write_method_info(const methodHandle& method);
103 void write_code_attribute(const methodHandle& method);
104 void write_exceptions_attribute(ConstMethod* const_method);
105 void write_method_parameter_attribute(const ConstMethod* const_method);
106 void write_synthetic_attribute();
107 void write_class_attributes();
108 void write_source_file_attribute();
109 void write_source_debug_extension_attribute();
110 u2 line_number_table_entries(const methodHandle& method);
111 void write_line_number_table_attribute(const methodHandle& method, u2 num_entries);
112 void write_local_variable_table_attribute(const methodHandle& method, u2 num_entries);
113 void write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries);
114 void write_stackmap_table_attribute(const methodHandle& method, int stackmap_table_len);
115 u2 inner_classes_attribute_length();
116 void write_inner_classes_attribute(int length);
117 void write_signature_attribute(u2 generic_signaure_index);
118 void write_attribute_name_index(const char* name);
119 void write_annotations_attribute(const char* attr_name, AnnotationArray* annos);
120 void write_bootstrapmethod_attribute();
121 void write_nest_host_attribute();
122 void write_nest_members_attribute();
123 void write_permitted_subclasses_attribute();
124 void write_record_attribute();
125 void write_loadable_descriptors_attribute();
126
127 address writeable_address(size_t size);
128 void write_u1(u1 x);
129 void write_u2(u2 x);
130 void write_u4(u4 x);
131 void write_u8(u8 x);
132
133 public:
134 // Calls to this constructor must be proceeded by a ResourceMark
135 // and a HandleMark
136 JvmtiClassFileReconstituter(InstanceKlass* ik) :
137 JvmtiConstantPoolReconstituter(ik) {
138 _buffer_size = initial_buffer_size;
139 _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size);
140 _thread = Thread::current();
141 write_class_file_format();
142 };
143
144 size_t class_file_size() { return _buffer_ptr - _buffer; }
145
146 u1* class_file_bytes() { return _buffer; }
147
148 static void copy_bytecodes(const methodHandle& method, unsigned char* bytecodes);
149 };
150
151 #endif // SHARE_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP