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annotate src/share/vm/oops/constMethod.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/share/vm/oops/constMethodOop.cpp@8150fa46d2ed
children 4735d2c84362
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1 /*
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "interpreter/interpreter.hpp"
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27 #include "memory/gcLocker.hpp"
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28 #include "memory/metadataFactory.hpp"
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29 #include "oops/constMethod.hpp"
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30 #include "oops/method.hpp"
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32 // Static initialization
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33 const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
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34 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
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35
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36 ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
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37 int byte_code_size,
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38 int compressed_line_number_size,
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39 int localvariable_table_length,
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40 int exception_table_length,
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41 int checked_exceptions_length,
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42 TRAPS) {
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43 int size = ConstMethod::size(byte_code_size,
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44 compressed_line_number_size,
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45 localvariable_table_length,
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46 exception_table_length,
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47 checked_exceptions_length);
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48 return new (loader_data, size, true, THREAD) ConstMethod(
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49 byte_code_size, compressed_line_number_size,
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50 localvariable_table_length, exception_table_length,
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51 checked_exceptions_length, size);
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52 }
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53
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54 ConstMethod::ConstMethod(int byte_code_size,
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55 int compressed_line_number_size,
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56 int localvariable_table_length,
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57 int exception_table_length,
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58 int checked_exceptions_length,
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59 int size) {
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60
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61 No_Safepoint_Verifier no_safepoint;
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62 set_interpreter_kind(Interpreter::invalid);
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63 init_fingerprint();
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64 set_constants(NULL);
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65 set_stackmap_data(NULL);
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66 set_code_size(byte_code_size);
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67 set_constMethod_size(size);
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68 set_inlined_tables_length(checked_exceptions_length,
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69 compressed_line_number_size,
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70 localvariable_table_length,
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71 exception_table_length);
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72 assert(this->size() == size, "wrong size for object");
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73 }
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74
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75
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76 // Deallocate metadata fields associated with ConstMethod*
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77 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
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78 set_interpreter_kind(Interpreter::invalid);
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79 if (stackmap_data() != NULL) {
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80 MetadataFactory::free_array<u1>(loader_data, stackmap_data());
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81 }
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82 set_stackmap_data(NULL);
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83 }
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84
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85 // How big must this constMethodObject be?
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86
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87 int ConstMethod::size(int code_size,
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88 int compressed_line_number_size,
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89 int local_variable_table_length,
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90 int exception_table_length,
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91 int checked_exceptions_length) {
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92 int extra_bytes = code_size;
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93 if (compressed_line_number_size > 0) {
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94 extra_bytes += compressed_line_number_size;
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95 }
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96 if (checked_exceptions_length > 0) {
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97 extra_bytes += sizeof(u2);
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98 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
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99 }
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100 if (local_variable_table_length > 0) {
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101 extra_bytes += sizeof(u2);
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102 extra_bytes +=
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103 local_variable_table_length * sizeof(LocalVariableTableElement);
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104 }
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105 if (exception_table_length > 0) {
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106 extra_bytes += sizeof(u2);
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107 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
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108 }
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109 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
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110 return align_object_size(header_size() + extra_words);
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111 }
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112
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113 Method* ConstMethod::method() const {
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114 return InstanceKlass::cast(_constants->pool_holder())->method_with_idnum(
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115 _method_idnum);
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116 }
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117
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118 // linenumber table - note that length is unknown until decompression,
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119 // see class CompressedLineNumberReadStream.
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120
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121 u_char* ConstMethod::compressed_linenumber_table() const {
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122 // Located immediately following the bytecodes.
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123 assert(has_linenumber_table(), "called only if table is present");
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124 return code_end();
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125 }
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126
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127 u2* ConstMethod::checked_exceptions_length_addr() const {
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128 // Located at the end of the constMethod.
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129 assert(has_checked_exceptions(), "called only if table is present");
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130 return last_u2_element();
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131 }
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132
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133 u2* ConstMethod::exception_table_length_addr() const {
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134 assert(has_exception_handler(), "called only if table is present");
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135 if (has_checked_exceptions()) {
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136 // If checked_exception present, locate immediately before them.
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137 return (u2*) checked_exceptions_start() - 1;
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138 } else {
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139 // Else, the exception table is at the end of the constMethod.
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140 return last_u2_element();
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141 }
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142 }
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143
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144 u2* ConstMethod::localvariable_table_length_addr() const {
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145 assert(has_localvariable_table(), "called only if table is present");
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146 if (has_exception_handler()) {
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147 // If exception_table present, locate immediately before them.
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148 return (u2*) exception_table_start() - 1;
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149 } else {
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150 if (has_checked_exceptions()) {
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151 // If checked_exception present, locate immediately before them.
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152 return (u2*) checked_exceptions_start() - 1;
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153 } else {
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154 // Else, the linenumber table is at the end of the constMethod.
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155 return last_u2_element();
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156 }
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157 }
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158 }
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159
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160
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161 // Update the flags to indicate the presence of these optional fields.
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162 void ConstMethod::set_inlined_tables_length(
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163 int checked_exceptions_len,
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164 int compressed_line_number_size,
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165 int localvariable_table_len,
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166 int exception_table_len) {
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167 // Must be done in the order below, otherwise length_addr accessors
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168 // will not work. Only set bit in header if length is positive.
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169 assert(_flags == 0, "Error");
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170 if (compressed_line_number_size > 0) {
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171 _flags |= _has_linenumber_table;
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172 }
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173 if (checked_exceptions_len > 0) {
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174 _flags |= _has_checked_exceptions;
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175 *(checked_exceptions_length_addr()) = checked_exceptions_len;
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176 }
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177 if (exception_table_len > 0) {
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178 _flags |= _has_exception_table;
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179 *(exception_table_length_addr()) = exception_table_len;
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180 }
0
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181 if (localvariable_table_len > 0) {
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182 _flags |= _has_localvariable_table;
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183 *(localvariable_table_length_addr()) = localvariable_table_len;
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184 }
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185 }
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186
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187
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188 int ConstMethod::checked_exceptions_length() const {
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189 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
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190 }
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191
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192
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193 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
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194 u2* addr = checked_exceptions_length_addr();
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195 u2 length = *addr;
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196 assert(length > 0, "should only be called if table is present");
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197 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
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198 return (CheckedExceptionElement*) addr;
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199 }
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200
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201
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202 int ConstMethod::localvariable_table_length() const {
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203 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
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204 }
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205
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206
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207 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
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208 u2* addr = localvariable_table_length_addr();
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209 u2 length = *addr;
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210 assert(length > 0, "should only be called if table is present");
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211 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
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212 return (LocalVariableTableElement*) addr;
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213 }
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214
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215 int ConstMethod::exception_table_length() const {
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216 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
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217 }
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218
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219 ExceptionTableElement* ConstMethod::exception_table_start() const {
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220 u2* addr = exception_table_length_addr();
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221 u2 length = *addr;
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222 assert(length > 0, "should only be called if table is present");
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223 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
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224 return (ExceptionTableElement*)addr;
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225 }
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226
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227
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228 // Printing
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229
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230 void ConstMethod::print_on(outputStream* st) const {
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231 ResourceMark rm;
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232 assert(is_constMethod(), "must be constMethod");
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233 st->print_cr(internal_name());
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234 st->print(" - method: " INTPTR_FORMAT " ", (address)method());
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235 method()->print_value_on(st); st->cr();
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236 if (has_stackmap_table()) {
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237 st->print(" - stackmap data: ");
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238 stackmap_data()->print_value_on(st);
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239 st->cr();
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240 }
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241 }
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242
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243 // Short version of printing ConstMethod* - just print the name of the
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244 // method it belongs to.
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245 void ConstMethod::print_value_on(outputStream* st) const {
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246 assert(is_constMethod(), "must be constMethod");
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247 st->print(" const part of method " );
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248 method()->print_value_on(st);
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249 }
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250
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251
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252 // Verification
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253
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254 void ConstMethod::verify_on(outputStream* st) {
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255 guarantee(is_constMethod(), "object must be constMethod");
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256 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
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257
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258 // Verification can occur during oop construction before the method or
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259 // other fields have been initialized.
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260 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
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261 guarantee(method()->is_method(), "should be method");
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262
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263 address m_end = (address)((oop*) this + size());
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264 address compressed_table_start = code_end();
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265 guarantee(compressed_table_start <= m_end, "invalid method layout");
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266 address compressed_table_end = compressed_table_start;
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267 // Verify line number table
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268 if (has_linenumber_table()) {
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269 CompressedLineNumberReadStream stream(compressed_linenumber_table());
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270 while (stream.read_pair()) {
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271 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
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272 }
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273 compressed_table_end += stream.position();
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274 }
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275 guarantee(compressed_table_end <= m_end, "invalid method layout");
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276 // Verify checked exceptions, exception table and local variable tables
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277 if (has_checked_exceptions()) {
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278 u2* addr = checked_exceptions_length_addr();
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279 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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280 }
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281 if (has_exception_handler()) {
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282 u2* addr = exception_table_length_addr();
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283 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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284 }
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285 if (has_localvariable_table()) {
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286 u2* addr = localvariable_table_length_addr();
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287 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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288 }
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289 // Check compressed_table_end relative to uncompressed_table_start
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290 u2* uncompressed_table_start;
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291 if (has_localvariable_table()) {
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292 uncompressed_table_start = (u2*) localvariable_table_start();
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293 } else if (has_exception_handler()) {
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294 uncompressed_table_start = (u2*) exception_table_start();
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295 } else if (has_checked_exceptions()) {
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296 uncompressed_table_start = (u2*) checked_exceptions_start();
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297 } else {
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298 uncompressed_table_start = (u2*) m_end;
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299 }
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300 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
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301 int max_gap = align_object_size(1)*BytesPerWord;
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302 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
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303 }