1 /* 2 * Copyright (c) 2005, 2010, 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_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP 26 #define SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP 27 28 #include "jvmtifiles/jvmtiEnv.hpp" 29 30 31 class JvmtiConstantPoolReconstituter : public StackObj { 32 private: 33 int _cpool_size; 34 SymbolHashMap* _symmap; 35 SymbolHashMap* _classmap; 36 constantPoolHandle _cpool; 37 instanceKlassHandle _ikh; 38 jvmtiError _err; 39 40 protected: 41 instanceKlassHandle ikh() { return _ikh; }; 42 constantPoolHandle cpool() { return _cpool; }; 43 44 u2 symbol_to_cpool_index(symbolOop sym) { 45 return _symmap->symbol_to_value(sym); 46 } 47 48 u2 class_symbol_to_cpool_index(symbolOop sym) { 49 return _classmap->symbol_to_value(sym); 50 } 51 52 public: 53 // Calls to this constructor must be proceeded by a ResourceMark 54 // and a HandleMark 55 JvmtiConstantPoolReconstituter(instanceKlassHandle ikh){ 56 set_error(JVMTI_ERROR_NONE); 57 _ikh = ikh; 58 _cpool = constantPoolHandle(Thread::current(), ikh->constants()); 59 _symmap = new SymbolHashMap(); 60 _classmap = new SymbolHashMap(); 61 _cpool_size = _cpool->hash_entries_to(_symmap, _classmap); 62 if (_cpool_size == 0) { 63 set_error(JVMTI_ERROR_OUT_OF_MEMORY); 64 } else if (_cpool_size < 0) { 65 set_error(JVMTI_ERROR_INTERNAL); 66 } 67 } 68 69 ~JvmtiConstantPoolReconstituter() { 70 if (_symmap != NULL) { 71 os::free(_symmap); 72 _symmap = NULL; 73 } 74 if (_classmap != NULL) { 75 os::free(_classmap); 76 _classmap = NULL; 77 } 78 } 79 80 81 void set_error(jvmtiError err) { _err = err; } 82 jvmtiError get_error() { return _err; } 83 84 int cpool_size() { return _cpool_size; } 85 86 void copy_cpool_bytes(unsigned char *cpool_bytes) { 87 if (cpool_bytes == NULL) { 88 assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL"); 89 return; 90 } 91 cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes); 92 } 93 }; 94 95 96 class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter { 97 private: 98 size_t _buffer_size; 99 u1* _buffer; 100 u1* _buffer_ptr; 101 Thread* _thread; 102 103 enum { 104 // initial size should be power of two 105 initial_buffer_size = 1024 106 }; 107 108 inline Thread* thread() { return _thread; } 109 110 void write_class_file_format(); 111 void write_field_infos(); 112 void write_method_infos(); 113 void write_method_info(methodHandle method); 114 void write_code_attribute(methodHandle method); 115 void write_exceptions_attribute(constMethodHandle const_method); 116 void write_synthetic_attribute(); 117 void write_class_attributes(); 118 void write_source_file_attribute(); 119 void write_source_debug_extension_attribute(); 120 u2 line_number_table_entries(methodHandle method); 121 void write_line_number_table_attribute(methodHandle method, u2 num_entries); 122 void write_stackmap_table_attribute(methodHandle method, int stackmap_table_len); 123 u2 inner_classes_attribute_length(); 124 void write_inner_classes_attribute(int length); 125 void write_signature_attribute(u2 generic_signaure_index); 126 void write_attribute_name_index(const char* name); 127 void write_annotations_attribute(const char* attr_name, typeArrayHandle annos); 128 129 address writeable_address(size_t size); 130 void write_u1(u1 x); 131 void write_u2(u2 x); 132 void write_u4(u4 x); 133 void write_u8(u8 x); 134 135 public: 136 // Calls to this constructor must be proceeded by a ResourceMark 137 // and a HandleMark 138 JvmtiClassFileReconstituter(instanceKlassHandle ikh) : 139 JvmtiConstantPoolReconstituter(ikh) { 140 _buffer_size = initial_buffer_size; 141 _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size); 142 _thread = Thread::current(); 143 write_class_file_format(); 144 }; 145 146 size_t class_file_size() { return _buffer_ptr - _buffer; } 147 148 u1* class_file_bytes() { return _buffer; } 149 150 static void copy_bytecodes(methodHandle method, unsigned char* bytecodes); 151 }; 152 153 #endif // SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP