jvmtiClassFileReconstituter.hpp revision 1472:c18cbe5936b8 
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
26class 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
91class 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};
147