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annotate src/share/vm/oops/constMethod.cpp @ 7482:989155e2d07a

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Merge with hs25-b15.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 16 Jan 2013 01:34:24 +0100
parents ade95d680b42
children 16fb9f942703
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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 int method_parameters_length,
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43 u2 generic_signature_index,
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44 MethodType method_type,
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45 TRAPS) {
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46 int size = ConstMethod::size(byte_code_size,
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47 compressed_line_number_size,
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48 localvariable_table_length,
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49 exception_table_length,
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50 checked_exceptions_length,
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51 method_parameters_length,
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52 generic_signature_index);
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53 return new (loader_data, size, true, THREAD) ConstMethod(
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54 byte_code_size, compressed_line_number_size, localvariable_table_length,
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55 exception_table_length, checked_exceptions_length,
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56 method_parameters_length, generic_signature_index,
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57 method_type, size);
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58 }
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59
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60 ConstMethod::ConstMethod(int byte_code_size,
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61 int compressed_line_number_size,
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62 int localvariable_table_length,
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63 int exception_table_length,
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64 int checked_exceptions_length,
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65 int method_parameters_length,
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66 u2 generic_signature_index,
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67 MethodType method_type,
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68 int size) {
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69
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70 No_Safepoint_Verifier no_safepoint;
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71 set_interpreter_kind(Interpreter::invalid);
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72 init_fingerprint();
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73 set_constants(NULL);
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74 set_stackmap_data(NULL);
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75 set_code_size(byte_code_size);
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76 set_constMethod_size(size);
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77 set_inlined_tables_length(generic_signature_index,
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78 checked_exceptions_length,
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79 compressed_line_number_size,
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80 localvariable_table_length,
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81 exception_table_length,
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82 method_parameters_length);
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83 set_method_type(method_type);
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84 assert(this->size() == size, "wrong size for object");
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85 }
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86
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87
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88 // Deallocate metadata fields associated with ConstMethod*
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89 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
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90 set_interpreter_kind(Interpreter::invalid);
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91 if (stackmap_data() != NULL) {
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92 MetadataFactory::free_array<u1>(loader_data, stackmap_data());
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93 }
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94 set_stackmap_data(NULL);
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95 }
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96
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97 // How big must this constMethodObject be?
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98
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99 int ConstMethod::size(int code_size,
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100 int compressed_line_number_size,
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101 int local_variable_table_length,
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102 int exception_table_length,
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103 int checked_exceptions_length,
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104 int method_parameters_length,
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105 u2 generic_signature_index) {
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106 int extra_bytes = code_size;
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107 if (compressed_line_number_size > 0) {
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108 extra_bytes += compressed_line_number_size;
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109 }
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110 if (checked_exceptions_length > 0) {
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111 extra_bytes += sizeof(u2);
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112 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
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113 }
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114 if (local_variable_table_length > 0) {
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115 extra_bytes += sizeof(u2);
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116 extra_bytes +=
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117 local_variable_table_length * sizeof(LocalVariableTableElement);
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118 }
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119 if (exception_table_length > 0) {
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120 extra_bytes += sizeof(u2);
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121 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
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122 }
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123 if (generic_signature_index != 0) {
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124 extra_bytes += sizeof(u2);
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125 }
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126 if (method_parameters_length > 0) {
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127 extra_bytes += sizeof(u2);
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128 extra_bytes += method_parameters_length * sizeof(MethodParametersElement);
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129 }
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130 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
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131 return align_object_size(header_size() + extra_words);
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132 }
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133
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134 Method* ConstMethod::method() const {
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135 return _constants->pool_holder()->method_with_idnum(_method_idnum);
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136 }
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137
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138 // linenumber table - note that length is unknown until decompression,
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139 // see class CompressedLineNumberReadStream.
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140
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141 u_char* ConstMethod::compressed_linenumber_table() const {
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142 // Located immediately following the bytecodes.
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143 assert(has_linenumber_table(), "called only if table is present");
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144 return code_end();
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145 }
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146
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147 u2* ConstMethod::generic_signature_index_addr() const {
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148 // Located at the end of the constMethod.
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149 assert(has_generic_signature(), "called only if generic signature exists");
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150 return last_u2_element();
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151 }
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152
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153 u2* ConstMethod::checked_exceptions_length_addr() const {
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154 // Located immediately before the generic signature index.
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155 assert(has_checked_exceptions(), "called only if table is present");
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156 if(has_method_parameters()) {
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157 // If method parameters present, locate immediately before them.
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158 return (u2*)method_parameters_start() - 1;
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159 } else {
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160 // Else, the exception table is at the end of the constMethod.
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161 return has_generic_signature() ? (last_u2_element() - 1) :
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162 last_u2_element();
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163 }
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164 }
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165
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166 u2* ConstMethod::method_parameters_length_addr() const {
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167 assert(has_method_parameters(), "called only if table is present");
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168 return has_generic_signature() ? (last_u2_element() - 1) :
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169 last_u2_element();
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170 }
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171
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172 u2* ConstMethod::exception_table_length_addr() const {
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173 assert(has_exception_handler(), "called only if table is present");
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174 if (has_checked_exceptions()) {
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175 // If checked_exception present, locate immediately before them.
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176 return (u2*) checked_exceptions_start() - 1;
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177 } else {
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178 if(has_method_parameters()) {
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179 // If method parameters present, locate immediately before them.
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180 return (u2*)method_parameters_start() - 1;
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181 } else {
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182 // Else, the exception table is at the end of the constMethod.
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183 return has_generic_signature() ? (last_u2_element() - 1) :
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184 last_u2_element();
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185 }
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186 }
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187 }
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188
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189 u2* ConstMethod::localvariable_table_length_addr() const {
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190 assert(has_localvariable_table(), "called only if table is present");
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191 if (has_exception_handler()) {
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192 // If exception_table present, locate immediately before them.
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193 return (u2*) exception_table_start() - 1;
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194 } else {
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195 if (has_checked_exceptions()) {
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196 // If checked_exception present, locate immediately before them.
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197 return (u2*) checked_exceptions_start() - 1;
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198 } else {
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199 if(has_method_parameters()) {
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200 // If method parameters present, locate immediately before them.
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201 return (u2*)method_parameters_start() - 1;
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202 } else {
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203 // Else, the exception table is at the end of the constMethod.
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204 return has_generic_signature() ? (last_u2_element() - 1) :
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205 last_u2_element();
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206 }
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207 }
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208 }
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209 }
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210
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211 // Update the flags to indicate the presence of these optional fields.
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212 void ConstMethod::set_inlined_tables_length(u2 generic_signature_index,
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213 int checked_exceptions_len,
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214 int compressed_line_number_size,
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215 int localvariable_table_len,
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216 int exception_table_len,
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217 int method_parameters_len) {
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218 assert(_flags == 0, "Error");
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219 if (compressed_line_number_size > 0)
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220 _flags |= _has_linenumber_table;
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221 if (generic_signature_index != 0)
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222 _flags |= _has_generic_signature;
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223 if (method_parameters_len > 0)
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224 _flags |= _has_method_parameters;
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225 if (checked_exceptions_len > 0)
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226 _flags |= _has_checked_exceptions;
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227 if (exception_table_len > 0)
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228 _flags |= _has_exception_table;
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229 if (localvariable_table_len > 0)
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230 _flags |= _has_localvariable_table;
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231
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232 // This code is extremely brittle and should possibly be revised.
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233 // The *_length_addr functions walk backwards through the
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234 // constMethod data, using each of the length indexes ahead of them,
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235 // as well as the flags variable. Therefore, the indexes must be
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236 // initialized in reverse order, or else they will compute the wrong
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237 // offsets. Moving the initialization of _flags into a separate
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238 // block solves *half* of the problem, but the following part will
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239 // still break if the order is not exactly right.
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240 //
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241 // Also, the servicability agent needs to be informed anytime
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242 // anything is added here. It might be advisable to have some sort
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243 // of indication of this inline.
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244 if (generic_signature_index != 0)
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245 *(generic_signature_index_addr()) = generic_signature_index;
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246 // New data should probably go here.
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247 if (method_parameters_len > 0)
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248 *(method_parameters_length_addr()) = method_parameters_len;
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249 if (checked_exceptions_len > 0)
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250 *(checked_exceptions_length_addr()) = checked_exceptions_len;
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251 if (exception_table_len > 0)
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252 *(exception_table_length_addr()) = exception_table_len;
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253 if (localvariable_table_len > 0)
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254 *(localvariable_table_length_addr()) = localvariable_table_len;
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255 }
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256
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257 int ConstMethod::method_parameters_length() const {
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258 return has_method_parameters() ? *(method_parameters_length_addr()) : 0;
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259 }
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260
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261 MethodParametersElement* ConstMethod::method_parameters_start() const {
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262 u2* addr = method_parameters_length_addr();
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263 u2 length = *addr;
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264 assert(length > 0, "should only be called if table is present");
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265 addr -= length * sizeof(MethodParametersElement) / sizeof(u2);
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266 return (MethodParametersElement*) addr;
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267 }
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268
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269
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270 int ConstMethod::checked_exceptions_length() const {
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271 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
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272 }
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273
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274
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275 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
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276 u2* addr = checked_exceptions_length_addr();
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277 u2 length = *addr;
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278 assert(length > 0, "should only be called if table is present");
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279 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
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280 return (CheckedExceptionElement*) addr;
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281 }
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282
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283
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284 int ConstMethod::localvariable_table_length() const {
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285 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
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286 }
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287
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288
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289 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
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290 u2* addr = localvariable_table_length_addr();
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291 u2 length = *addr;
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292 assert(length > 0, "should only be called if table is present");
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293 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
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294 return (LocalVariableTableElement*) addr;
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295 }
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296
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297 int ConstMethod::exception_table_length() const {
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298 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
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299 }
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300
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301 ExceptionTableElement* ConstMethod::exception_table_start() const {
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302 u2* addr = exception_table_length_addr();
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303 u2 length = *addr;
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304 assert(length > 0, "should only be called if table is present");
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305 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
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306 return (ExceptionTableElement*)addr;
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307 }
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308
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309
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310 // Printing
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311
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312 void ConstMethod::print_on(outputStream* st) const {
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313 ResourceMark rm;
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314 assert(is_constMethod(), "must be constMethod");
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315 st->print_cr(internal_name());
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316 st->print(" - method: " INTPTR_FORMAT " ", (address)method());
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317 method()->print_value_on(st); st->cr();
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318 if (has_stackmap_table()) {
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319 st->print(" - stackmap data: ");
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320 stackmap_data()->print_value_on(st);
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321 st->cr();
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322 }
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323 }
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324
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325 // Short version of printing ConstMethod* - just print the name of the
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326 // method it belongs to.
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327 void ConstMethod::print_value_on(outputStream* st) const {
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328 assert(is_constMethod(), "must be constMethod");
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329 st->print(" const part of method " );
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330 method()->print_value_on(st);
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331 }
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332
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333
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334 // Verification
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335
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336 void ConstMethod::verify_on(outputStream* st) {
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337 guarantee(is_constMethod(), "object must be constMethod");
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338 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
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339
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340 // Verification can occur during oop construction before the method or
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341 // other fields have been initialized.
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342 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
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343 guarantee(method()->is_method(), "should be method");
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344
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345 address m_end = (address)((oop*) this + size());
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346 address compressed_table_start = code_end();
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347 guarantee(compressed_table_start <= m_end, "invalid method layout");
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348 address compressed_table_end = compressed_table_start;
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349 // Verify line number table
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350 if (has_linenumber_table()) {
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351 CompressedLineNumberReadStream stream(compressed_linenumber_table());
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352 while (stream.read_pair()) {
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353 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
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354 }
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355 compressed_table_end += stream.position();
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356 }
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357 guarantee(compressed_table_end <= m_end, "invalid method layout");
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358 // Verify checked exceptions, exception table and local variable tables
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359 if (has_method_parameters()) {
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360 u2* addr = method_parameters_length_addr();
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361 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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362 }
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363 if (has_checked_exceptions()) {
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364 u2* addr = checked_exceptions_length_addr();
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365 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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366 }
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367 if (has_exception_handler()) {
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368 u2* addr = exception_table_length_addr();
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369 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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370 }
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371 if (has_localvariable_table()) {
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372 u2* addr = localvariable_table_length_addr();
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373 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
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374 }
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375 // Check compressed_table_end relative to uncompressed_table_start
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376 u2* uncompressed_table_start;
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377 if (has_localvariable_table()) {
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378 uncompressed_table_start = (u2*) localvariable_table_start();
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379 } else if (has_exception_handler()) {
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380 uncompressed_table_start = (u2*) exception_table_start();
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381 } else if (has_checked_exceptions()) {
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382 uncompressed_table_start = (u2*) checked_exceptions_start();
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383 } else if (has_method_parameters()) {
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384 uncompressed_table_start = (u2*) method_parameters_start();
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385 } else {
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386 uncompressed_table_start = (u2*) m_end;
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387 }
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388 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
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389 int max_gap = align_object_size(1)*BytesPerWord;
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390 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
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391 }