0
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1 /*
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2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24 # include "incls/_precompiled.incl"
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25 # include "incls/_jvmtiClassFileReconstituter.cpp.incl"
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26
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27 // FIXME: add Deprecated, LVT, LVTT attributes
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28 // FIXME: fix Synthetic attribute
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29 // FIXME: per Serguei, add error return handling for constantPoolOopDesc::copy_cpool_bytes()
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30
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31
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32 // Write the field information portion of ClassFile structure
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33 // JVMSpec| u2 fields_count;
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34 // JVMSpec| field_info fields[fields_count];
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35 void JvmtiClassFileReconstituter::write_field_infos() {
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36 HandleMark hm(thread());
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37 typeArrayHandle fields(thread(), ikh()->fields());
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38 int fields_length = fields->length();
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39 int num_fields = fields_length / instanceKlass::next_offset;
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40 objArrayHandle fields_anno(thread(), ikh()->fields_annotations());
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41
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42 write_u2(num_fields);
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43 for (int index = 0; index < fields_length; index += instanceKlass::next_offset) {
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44 AccessFlags access_flags;
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45 int flags = fields->ushort_at(index + instanceKlass::access_flags_offset);
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46 access_flags.set_flags(flags);
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47 int name_index = fields->ushort_at(index + instanceKlass::name_index_offset);
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48 int signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset);
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49 int initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset);
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50 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
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51 int offset = ikh()->offset_from_fields( index );
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52 int generic_signature_index =
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53 fields->ushort_at(index + instanceKlass::generic_signature_offset);
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54 typeArrayHandle anno(thread(), fields_anno.not_null() ?
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55 (typeArrayOop)(fields_anno->obj_at(index / instanceKlass::next_offset)) :
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56 (typeArrayOop)NULL);
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57
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58 // JVMSpec| field_info {
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59 // JVMSpec| u2 access_flags;
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60 // JVMSpec| u2 name_index;
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61 // JVMSpec| u2 descriptor_index;
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62 // JVMSpec| u2 attributes_count;
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63 // JVMSpec| attribute_info attributes[attributes_count];
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64 // JVMSpec| }
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65
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66 write_u2(flags & JVM_RECOGNIZED_FIELD_MODIFIERS);
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67 write_u2(name_index);
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68 write_u2(signature_index);
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69 int attr_count = 0;
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70 if (initial_value_index != 0) {
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71 ++attr_count;
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72 }
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73 if (access_flags.is_synthetic()) {
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74 // ++attr_count;
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75 }
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76 if (generic_signature_index != 0) {
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77 ++attr_count;
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78 }
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79 if (anno.not_null()) {
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80 ++attr_count; // has RuntimeVisibleAnnotations attribute
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81 }
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82
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83 write_u2(attr_count);
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84
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85 if (initial_value_index != 0) {
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86 write_attribute_name_index("ConstantValue");
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87 write_u4(2); //length always 2
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88 write_u2(initial_value_index);
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89 }
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90 if (access_flags.is_synthetic()) {
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91 // write_synthetic_attribute();
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92 }
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93 if (generic_signature_index != 0) {
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94 write_signature_attribute(generic_signature_index);
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95 }
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96 if (anno.not_null()) {
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97 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
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98 }
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99 }
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100 }
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101
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102 // Write Code attribute
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103 // JVMSpec| Code_attribute {
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104 // JVMSpec| u2 attribute_name_index;
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105 // JVMSpec| u4 attribute_length;
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106 // JVMSpec| u2 max_stack;
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107 // JVMSpec| u2 max_locals;
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108 // JVMSpec| u4 code_length;
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109 // JVMSpec| u1 code[code_length];
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110 // JVMSpec| u2 exception_table_length;
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111 // JVMSpec| { u2 start_pc;
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112 // JVMSpec| u2 end_pc;
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113 // JVMSpec| u2 handler_pc;
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114 // JVMSpec| u2 catch_type;
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115 // JVMSpec| } exception_table[exception_table_length];
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116 // JVMSpec| u2 attributes_count;
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117 // JVMSpec| attribute_info attributes[attributes_count];
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118 // JVMSpec| }
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119 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {
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120 constMethodHandle const_method(thread(), method->constMethod());
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121 u2 line_num_cnt = 0;
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122 int stackmap_len = 0;
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123
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124 // compute number and length of attributes -- FIXME: for now no LVT
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125 int attr_count = 0;
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126 int attr_size = 0;
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127 if (const_method->has_linenumber_table()) {
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128 line_num_cnt = line_number_table_entries(method);
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129 if (line_num_cnt != 0) {
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130 ++attr_count;
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131 // Compute the complete size of the line number table attribute:
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132 // LineNumberTable_attribute {
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133 // u2 attribute_name_index;
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134 // u4 attribute_length;
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135 // u2 line_number_table_length;
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136 // { u2 start_pc;
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137 // u2 line_number;
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138 // } line_number_table[line_number_table_length];
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139 // }
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140 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
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141 }
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142 }
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143 if (method->has_stackmap_table()) {
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144 stackmap_len = method->stackmap_data()->length();
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145 if (stackmap_len != 0) {
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146 ++attr_count;
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147 // Compute the size of the stack map table attribute (VM stores raw):
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148 // StackMapTable_attribute {
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149 // u2 attribute_name_index;
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150 // u4 attribute_length;
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151 // u2 number_of_entries;
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152 // stack_map_frame_entries[number_of_entries];
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153 // }
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154 attr_size += 2 + 4 + stackmap_len;
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155 }
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156 }
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157
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158 typeArrayHandle exception_table(thread(), const_method->exception_table());
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159 int exception_table_length = exception_table->length();
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160 int exception_table_entries = exception_table_length / 4;
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161 int code_size = const_method->code_size();
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162 int size =
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163 2+2+4 + // max_stack, max_locals, code_length
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164 code_size + // code
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165 2 + // exception_table_length
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166 (2+2+2+2) * exception_table_entries + // exception_table
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167 2 + // attributes_count
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168 attr_size; // attributes
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169
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170 write_attribute_name_index("Code");
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171 write_u4(size);
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172 write_u2(method->max_stack());
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173 write_u2(method->max_locals());
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174 write_u4(code_size);
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175 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
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176 write_u2(exception_table_entries);
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177 for (int index = 0; index < exception_table_length; ) {
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178 write_u2(exception_table->int_at(index++));
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179 write_u2(exception_table->int_at(index++));
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180 write_u2(exception_table->int_at(index++));
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181 write_u2(exception_table->int_at(index++));
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182 }
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183 write_u2(attr_count);
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184 if (line_num_cnt != 0) {
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185 write_line_number_table_attribute(method, line_num_cnt);
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186 }
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187 if (stackmap_len != 0) {
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188 write_stackmap_table_attribute(method, stackmap_len);
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189 }
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190
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191 // FIXME: write LVT attribute
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192 }
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193
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194 // Write Exceptions attribute
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195 // JVMSpec| Exceptions_attribute {
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196 // JVMSpec| u2 attribute_name_index;
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197 // JVMSpec| u4 attribute_length;
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198 // JVMSpec| u2 number_of_exceptions;
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199 // JVMSpec| u2 exception_index_table[number_of_exceptions];
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200 // JVMSpec| }
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201 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {
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202 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
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203 int checked_exceptions_length = const_method->checked_exceptions_length();
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204 int size =
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205 2 + // number_of_exceptions
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206 2 * checked_exceptions_length; // exception_index_table
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207
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208 write_attribute_name_index("Exceptions");
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209 write_u4(size);
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210 write_u2(checked_exceptions_length);
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211 for (int index = 0; index < checked_exceptions_length; index++) {
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212 write_u2(checked_exceptions[index].class_cp_index);
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213 }
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214 }
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215
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216 // Write SourceFile attribute
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217 // JVMSpec| SourceFile_attribute {
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218 // JVMSpec| u2 attribute_name_index;
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219 // JVMSpec| u4 attribute_length;
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220 // JVMSpec| u2 sourcefile_index;
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221 // JVMSpec| }
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222 void JvmtiClassFileReconstituter::write_source_file_attribute() {
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223 assert(ikh()->source_file_name() != NULL, "caller must check");
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224
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225 write_attribute_name_index("SourceFile");
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226 write_u4(2); // always length 2
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227 write_u2(symbol_to_cpool_index(ikh()->source_file_name()));
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228 }
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229
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230 // Write SourceDebugExtension attribute
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231 // JSR45| SourceDebugExtension_attribute {
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232 // JSR45| u2 attribute_name_index;
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233 // JSR45| u4 attribute_length;
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234 // JSR45| u2 sourcefile_index;
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235 // JSR45| }
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236 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
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237 assert(ikh()->source_debug_extension() != NULL, "caller must check");
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238
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239 write_attribute_name_index("SourceDebugExtension");
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240 write_u4(2); // always length 2
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241 write_u2(symbol_to_cpool_index(ikh()->source_debug_extension()));
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242 }
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243
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244 // Write (generic) Signature attribute
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245 // JVMSpec| Signature_attribute {
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246 // JVMSpec| u2 attribute_name_index;
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247 // JVMSpec| u4 attribute_length;
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248 // JVMSpec| u2 signature_index;
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249 // JVMSpec| }
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250 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
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251 write_attribute_name_index("Signature");
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252 write_u4(2); // always length 2
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253 write_u2(generic_signature_index);
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254 }
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255
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256 // Compute the number of entries in the InnerClasses attribute
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257 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
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258 typeArrayOop inner_class_list = ikh()->inner_classes();
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259 return (inner_class_list == NULL) ? 0 : inner_class_list->length();
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260 }
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261
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262 // Write an annotation attribute. The VM stores them in raw form, so all we need
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263 // to do is add the attrubute name and fill in the length.
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264 // JSR202| *Annotations_attribute {
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265 // JSR202| u2 attribute_name_index;
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266 // JSR202| u4 attribute_length;
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267 // JSR202| ...
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268 // JSR202| }
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269 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
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270 typeArrayHandle annos) {
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271 u4 length = annos->length();
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272 write_attribute_name_index(attr_name);
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273 write_u4(length);
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274 memcpy(writeable_address(length), annos->byte_at_addr(0), length);
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275 }
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276
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277
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278 // Write InnerClasses attribute
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279 // JVMSpec| InnerClasses_attribute {
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280 // JVMSpec| u2 attribute_name_index;
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281 // JVMSpec| u4 attribute_length;
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282 // JVMSpec| u2 number_of_classes;
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283 // JVMSpec| { u2 inner_class_info_index;
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284 // JVMSpec| u2 outer_class_info_index;
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285 // JVMSpec| u2 inner_name_index;
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286 // JVMSpec| u2 inner_class_access_flags;
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287 // JVMSpec| } classes[number_of_classes];
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288 // JVMSpec| }
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289 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
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290 typeArrayOop inner_class_list = ikh()->inner_classes();
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291 guarantee(inner_class_list != NULL && inner_class_list->length() == length,
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292 "caller must check");
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293 typeArrayHandle inner_class_list_h(thread(), inner_class_list);
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294 assert (length % instanceKlass::inner_class_next_offset == 0, "just checking");
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295 u2 entry_count = length / instanceKlass::inner_class_next_offset;
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296 u4 size = 2 + entry_count * (2+2+2+2);
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297
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298 write_attribute_name_index("InnerClasses");
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299 write_u4(size);
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300 write_u2(entry_count);
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301 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {
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302 write_u2(inner_class_list_h->ushort_at(
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303 i + instanceKlass::inner_class_inner_class_info_offset));
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304 write_u2(inner_class_list_h->ushort_at(
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305 i + instanceKlass::inner_class_outer_class_info_offset));
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306 write_u2(inner_class_list_h->ushort_at(
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307 i + instanceKlass::inner_class_inner_name_offset));
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308 write_u2(inner_class_list_h->ushort_at(
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309 i + instanceKlass::inner_class_access_flags_offset));
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310 }
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311 }
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312
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313 // Write Synthetic attribute
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314 // JVMSpec| Synthetic_attribute {
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315 // JVMSpec| u2 attribute_name_index;
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316 // JVMSpec| u4 attribute_length;
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317 // JVMSpec| }
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318 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
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319 write_attribute_name_index("Synthetic");
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320 write_u4(0); //length always zero
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321 }
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322
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323 // Compute size of LineNumberTable
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324 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
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325 // The line number table is compressed so we don't know how big it is until decompressed.
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326 // Decompression is really fast so we just do it twice.
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327 u2 num_entries = 0;
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328 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
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329 while (stream.read_pair()) {
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330 num_entries++;
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331 }
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332 return num_entries;
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333 }
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334
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335 // Write LineNumberTable attribute
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336 // JVMSpec| LineNumberTable_attribute {
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337 // JVMSpec| u2 attribute_name_index;
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338 // JVMSpec| u4 attribute_length;
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339 // JVMSpec| u2 line_number_table_length;
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340 // JVMSpec| { u2 start_pc;
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341 // JVMSpec| u2 line_number;
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342 // JVMSpec| } line_number_table[line_number_table_length];
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343 // JVMSpec| }
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344 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
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345 u2 num_entries) {
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346
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347 write_attribute_name_index("LineNumberTable");
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348 write_u4(2 + num_entries * (2 + 2));
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349 write_u2(num_entries);
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350
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351 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
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352 while (stream.read_pair()) {
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353 write_u2(stream.bci());
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354 write_u2(stream.line());
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355 }
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356 }
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357
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358 // Write stack map table attribute
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359 // JSR-202| StackMapTable_attribute {
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360 // JSR-202| u2 attribute_name_index;
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361 // JSR-202| u4 attribute_length;
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362 // JSR-202| u2 number_of_entries;
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363 // JSR-202| stack_map_frame_entries[number_of_entries];
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364 // JSR-202| }
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365 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
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366 int stackmap_len) {
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367
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368 write_attribute_name_index("StackMapTable");
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369 write_u4(stackmap_len);
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370 memcpy(
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371 writeable_address(stackmap_len),
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372 (void*)(method->stackmap_data()->byte_at_addr(0)),
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373 stackmap_len);
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374 }
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375
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376 // Write one method_info structure
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377 // JVMSpec| method_info {
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378 // JVMSpec| u2 access_flags;
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379 // JVMSpec| u2 name_index;
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380 // JVMSpec| u2 descriptor_index;
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381 // JVMSpec| u2 attributes_count;
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382 // JVMSpec| attribute_info attributes[attributes_count];
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383 // JVMSpec| }
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384 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
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385 AccessFlags access_flags = method->access_flags();
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386 constMethodHandle const_method(thread(), method->constMethod());
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387 u2 generic_signature_index = const_method->generic_signature_index();
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388 typeArrayHandle anno(thread(), method->annotations());
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389 typeArrayHandle param_anno(thread(), method->parameter_annotations());
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390 typeArrayHandle default_anno(thread(), method->annotation_default());
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391
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392 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
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393 write_u2(const_method->name_index());
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394 write_u2(const_method->signature_index());
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395
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396 // write attributes in the same order javac does, so we can test with byte for
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397 // byte comparison
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398 int attr_count = 0;
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399 if (const_method->code_size() != 0) {
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400 ++attr_count; // has Code attribute
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401 }
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402 if (const_method->has_checked_exceptions()) {
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403 ++attr_count; // has Exceptions attribute
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404 }
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405 if (default_anno.not_null()) {
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406 ++attr_count; // has AnnotationDefault attribute
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407 }
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408 // Deprecated attribute would go here
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409 if (access_flags.is_synthetic()) { // FIXME
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410 // ++attr_count;
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411 }
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412 if (generic_signature_index != 0) {
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413 ++attr_count;
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414 }
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415 if (anno.not_null()) {
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416 ++attr_count; // has RuntimeVisibleAnnotations attribute
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417 }
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418 if (param_anno.not_null()) {
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419 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
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420 }
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421
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422 write_u2(attr_count);
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423 if (const_method->code_size() > 0) {
|
|
424 write_code_attribute(method);
|
|
425 }
|
|
426 if (const_method->has_checked_exceptions()) {
|
|
427 write_exceptions_attribute(const_method);
|
|
428 }
|
|
429 if (default_anno.not_null()) {
|
|
430 write_annotations_attribute("AnnotationDefault", default_anno);
|
|
431 }
|
|
432 // Deprecated attribute would go here
|
|
433 if (access_flags.is_synthetic()) {
|
|
434 // write_synthetic_attribute();
|
|
435 }
|
|
436 if (generic_signature_index != 0) {
|
|
437 write_signature_attribute(generic_signature_index);
|
|
438 }
|
|
439 if (anno.not_null()) {
|
|
440 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
|
|
441 }
|
|
442 if (param_anno.not_null()) {
|
|
443 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
|
|
444 }
|
|
445 }
|
|
446
|
|
447 // Write the class attributes portion of ClassFile structure
|
|
448 // JVMSpec| u2 attributes_count;
|
|
449 // JVMSpec| attribute_info attributes[attributes_count];
|
|
450 void JvmtiClassFileReconstituter::write_class_attributes() {
|
|
451 u2 inner_classes_length = inner_classes_attribute_length();
|
|
452 symbolHandle generic_signature(thread(), ikh()->generic_signature());
|
|
453 typeArrayHandle anno(thread(), ikh()->class_annotations());
|
|
454
|
|
455 int attr_count = 0;
|
|
456 if (generic_signature() != NULL) {
|
|
457 ++attr_count;
|
|
458 }
|
|
459 if (ikh()->source_file_name() != NULL) {
|
|
460 ++attr_count;
|
|
461 }
|
|
462 if (ikh()->source_debug_extension() != NULL) {
|
|
463 ++attr_count;
|
|
464 }
|
|
465 if (inner_classes_length > 0) {
|
|
466 ++attr_count;
|
|
467 }
|
|
468 if (anno.not_null()) {
|
|
469 ++attr_count; // has RuntimeVisibleAnnotations attribute
|
|
470 }
|
|
471
|
|
472 write_u2(attr_count);
|
|
473
|
|
474 if (generic_signature() != NULL) {
|
|
475 write_signature_attribute(symbol_to_cpool_index(generic_signature()));
|
|
476 }
|
|
477 if (ikh()->source_file_name() != NULL) {
|
|
478 write_source_file_attribute();
|
|
479 }
|
|
480 if (ikh()->source_debug_extension() != NULL) {
|
|
481 write_source_debug_extension_attribute();
|
|
482 }
|
|
483 if (inner_classes_length > 0) {
|
|
484 write_inner_classes_attribute(inner_classes_length);
|
|
485 }
|
|
486 if (anno.not_null()) {
|
|
487 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
|
|
488 }
|
|
489 }
|
|
490
|
|
491 // Write the method information portion of ClassFile structure
|
|
492 // JVMSpec| u2 methods_count;
|
|
493 // JVMSpec| method_info methods[methods_count];
|
|
494 void JvmtiClassFileReconstituter::write_method_infos() {
|
|
495 HandleMark hm(thread());
|
|
496 objArrayHandle methods(thread(), ikh()->methods());
|
|
497 int num_methods = methods->length();
|
|
498
|
|
499 write_u2(num_methods);
|
|
500 if (JvmtiExport::can_maintain_original_method_order()) {
|
|
501 int index;
|
|
502 int original_index;
|
|
503 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
|
|
504
|
|
505 // invert the method order mapping
|
|
506 for (index = 0; index < num_methods; index++) {
|
|
507 original_index = ikh()->method_ordering()->int_at(index);
|
|
508 assert(original_index >= 0 && original_index < num_methods,
|
|
509 "invalid original method index");
|
|
510 method_order[original_index] = index;
|
|
511 }
|
|
512
|
|
513 // write in original order
|
|
514 for (original_index = 0; original_index < num_methods; original_index++) {
|
|
515 index = method_order[original_index];
|
|
516 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
|
|
517 write_method_info(method);
|
|
518 }
|
|
519 } else {
|
|
520 // method order not preserved just dump the method infos
|
|
521 for (int index = 0; index < num_methods; index++) {
|
|
522 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
|
|
523 write_method_info(method);
|
|
524 }
|
|
525 }
|
|
526 }
|
|
527
|
|
528 void JvmtiClassFileReconstituter::write_class_file_format() {
|
|
529 ReallocMark();
|
|
530
|
|
531 // JVMSpec| ClassFile {
|
|
532 // JVMSpec| u4 magic;
|
|
533 write_u4(0xCAFEBABE);
|
|
534
|
|
535 // JVMSpec| u2 minor_version;
|
|
536 // JVMSpec| u2 major_version;
|
|
537 write_u2(ikh()->minor_version());
|
|
538 u2 major = ikh()->major_version();
|
|
539 write_u2(major);
|
|
540
|
|
541 // JVMSpec| u2 constant_pool_count;
|
|
542 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
|
|
543 write_u2(cpool()->length());
|
|
544 copy_cpool_bytes(writeable_address(cpool_size()));
|
|
545
|
|
546 // JVMSpec| u2 access_flags;
|
|
547 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
|
|
548
|
|
549 // JVMSpec| u2 this_class;
|
|
550 // JVMSpec| u2 super_class;
|
|
551 write_u2(class_symbol_to_cpool_index(ikh()->name()));
|
|
552 klassOop super_class = ikh()->super();
|
|
553 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
|
|
554 class_symbol_to_cpool_index(super_class->klass_part()->name()));
|
|
555
|
|
556 // JVMSpec| u2 interfaces_count;
|
|
557 // JVMSpec| u2 interfaces[interfaces_count];
|
|
558 objArrayHandle interfaces(thread(), ikh()->local_interfaces());
|
|
559 int num_interfaces = interfaces->length();
|
|
560 write_u2(num_interfaces);
|
|
561 for (int index = 0; index < num_interfaces; index++) {
|
|
562 HandleMark hm(thread());
|
|
563 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
|
|
564 write_u2(class_symbol_to_cpool_index(iikh->name()));
|
|
565 }
|
|
566
|
|
567 // JVMSpec| u2 fields_count;
|
|
568 // JVMSpec| field_info fields[fields_count];
|
|
569 write_field_infos();
|
|
570
|
|
571 // JVMSpec| u2 methods_count;
|
|
572 // JVMSpec| method_info methods[methods_count];
|
|
573 write_method_infos();
|
|
574
|
|
575 // JVMSpec| u2 attributes_count;
|
|
576 // JVMSpec| attribute_info attributes[attributes_count];
|
|
577 // JVMSpec| } /* end ClassFile 8?
|
|
578 write_class_attributes();
|
|
579 }
|
|
580
|
|
581 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
|
|
582 size_t used_size = _buffer_ptr - _buffer;
|
|
583 if (size + used_size >= _buffer_size) {
|
|
584 // compute the new buffer size: must be at least twice as big as before
|
|
585 // plus whatever new is being used; then convert to nice clean block boundary
|
|
586 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
|
|
587 * initial_buffer_size;
|
|
588
|
|
589 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
|
|
590 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
|
|
591 _buffer_size = new_buffer_size;
|
|
592 _buffer_ptr = _buffer + used_size;
|
|
593 }
|
|
594 u1* ret_ptr = _buffer_ptr;
|
|
595 _buffer_ptr += size;
|
|
596 return ret_ptr;
|
|
597 }
|
|
598
|
|
599 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
|
|
600 unsigned int hash_ignored;
|
|
601 symbolOop sym = SymbolTable::lookup_only(name, (int)strlen(name), hash_ignored);
|
|
602 assert(sym != NULL, "attribute name symbol not found");
|
|
603 u2 attr_name_index = symbol_to_cpool_index(sym);
|
|
604 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
|
|
605 write_u2(attr_name_index);
|
|
606 }
|
|
607
|
|
608 void JvmtiClassFileReconstituter::write_u1(u1 x) {
|
|
609 *writeable_address(1) = x;
|
|
610 }
|
|
611
|
|
612 void JvmtiClassFileReconstituter::write_u2(u2 x) {
|
|
613 Bytes::put_Java_u2(writeable_address(2), x);
|
|
614 }
|
|
615
|
|
616 void JvmtiClassFileReconstituter::write_u4(u4 x) {
|
|
617 Bytes::put_Java_u4(writeable_address(4), x);
|
|
618 }
|
|
619
|
|
620 void JvmtiClassFileReconstituter::write_u8(u8 x) {
|
|
621 Bytes::put_Java_u8(writeable_address(8), x);
|
|
622 }
|
|
623
|
|
624 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
|
|
625 unsigned char* bytecodes) {
|
|
626 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
|
|
627 // and the breakpoint bytecode are converted to their original bytecodes.
|
|
628
|
|
629 BytecodeStream bs(mh);
|
|
630
|
|
631 unsigned char* p = bytecodes;
|
|
632 Bytecodes::Code code;
|
|
633 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
|
|
634
|
|
635 while ((code = bs.next()) >= 0) {
|
|
636 assert(Bytecodes::is_java_code(code), "sanity check");
|
|
637 assert(code != Bytecodes::_breakpoint, "sanity check");
|
|
638
|
|
639 // length of bytecode (mnemonic + operands)
|
|
640 address bcp = bs.bcp();
|
|
641 int len = bs.next_bcp() - bcp;
|
|
642 assert(len > 0, "length must be > 0");
|
|
643
|
|
644 // copy the bytecodes
|
|
645 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
|
|
646 if (len > 1) {
|
|
647 memcpy(p+1, bcp+1, len-1);
|
|
648 }
|
|
649
|
|
650 // During linking the get/put and invoke instructions are rewritten
|
|
651 // with an index into the constant pool cache. The original constant
|
|
652 // pool index must be returned to caller. Rewrite the index.
|
|
653 if (is_rewritten && len >= 3) {
|
|
654 switch (code) {
|
|
655 case Bytecodes::_getstatic : // fall through
|
|
656 case Bytecodes::_putstatic : // fall through
|
|
657 case Bytecodes::_getfield : // fall through
|
|
658 case Bytecodes::_putfield : // fall through
|
|
659 case Bytecodes::_invokevirtual : // fall through
|
|
660 case Bytecodes::_invokespecial : // fall through
|
|
661 case Bytecodes::_invokestatic : // fall through
|
|
662 case Bytecodes::_invokeinterface :
|
|
663 assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5),
|
|
664 "sanity check");
|
|
665 // cache cannot be pre-fetched since some classes won't have it yet
|
|
666 ConstantPoolCacheEntry* entry =
|
|
667 mh->constants()->cache()->entry_at(Bytes::get_native_u2(bcp+1));
|
|
668 int i = entry->constant_pool_index();
|
|
669 assert(i < mh->constants()->length(), "sanity check");
|
|
670 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
|
|
671 break;
|
|
672 }
|
|
673 }
|
|
674
|
|
675 p += len;
|
|
676 }
|
|
677 }
|