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annotate src/share/vm/oops/constMethodOop.cpp @ 6213:8150fa46d2ed

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7178145: Change constMethodOop::_exception_table to optionally inlined u2 table. Summary: Change constMethodOop::_exception_table to optionally inlined u2 table. Reviewed-by: bdelsart, coleenp, kamg
author jiangli
date Tue, 26 Jun 2012 19:08:44 -0400
parents 2fe087c3e814
children
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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 "oops/constMethodOop.hpp"
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27 #include "oops/methodOop.hpp"
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28
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29 // Static initialization
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30 const u2 constMethodOopDesc::MAX_IDNUM = 0xFFFE;
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31 const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF;
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32
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33 // How big must this constMethodObject be?
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34
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35 int constMethodOopDesc::object_size(int code_size,
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36 int compressed_line_number_size,
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37 int local_variable_table_length,
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38 int exception_table_length,
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39 int checked_exceptions_length) {
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40 int extra_bytes = code_size;
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41 if (compressed_line_number_size > 0) {
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42 extra_bytes += compressed_line_number_size;
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43 }
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44 if (checked_exceptions_length > 0) {
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45 extra_bytes += sizeof(u2);
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46 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
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47 }
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48 if (local_variable_table_length > 0) {
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49 extra_bytes += sizeof(u2);
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50 extra_bytes +=
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51 local_variable_table_length * sizeof(LocalVariableTableElement);
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52 }
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53 if (exception_table_length > 0) {
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54 extra_bytes += sizeof(u2);
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55 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
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56 }
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57 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
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58 return align_object_size(header_size() + extra_words);
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59 }
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60
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61 methodOop constMethodOopDesc::method() const {
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62 return instanceKlass::cast(_constants->pool_holder())->method_with_idnum(
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63 _method_idnum);
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64 }
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65
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66 // linenumber table - note that length is unknown until decompression,
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67 // see class CompressedLineNumberReadStream.
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68
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69 u_char* constMethodOopDesc::compressed_linenumber_table() const {
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70 // Located immediately following the bytecodes.
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71 assert(has_linenumber_table(), "called only if table is present");
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72 return code_end();
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73 }
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74
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75 u2* constMethodOopDesc::checked_exceptions_length_addr() const {
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76 // Located at the end of the constMethod.
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77 assert(has_checked_exceptions(), "called only if table is present");
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78 return last_u2_element();
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79 }
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80
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81 u2* constMethodOopDesc::exception_table_length_addr() const {
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82 assert(has_exception_handler(), "called only if table is present");
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83 if (has_checked_exceptions()) {
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84 // If checked_exception present, locate immediately before them.
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85 return (u2*) checked_exceptions_start() - 1;
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86 } else {
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87 // Else, the exception table is at the end of the constMethod.
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88 return last_u2_element();
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89 }
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90 }
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91
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92 u2* constMethodOopDesc::localvariable_table_length_addr() const {
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93 assert(has_localvariable_table(), "called only if table is present");
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94 if (has_exception_handler()) {
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95 // If exception_table present, locate immediately before them.
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96 return (u2*) exception_table_start() - 1;
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97 } else {
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98 if (has_checked_exceptions()) {
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99 // If checked_exception present, locate immediately before them.
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100 return (u2*) checked_exceptions_start() - 1;
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101 } else {
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102 // Else, the linenumber table is at the end of the constMethod.
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103 return last_u2_element();
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104 }
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105 }
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106 }
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107
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108
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109 // Update the flags to indicate the presence of these optional fields.
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110 void constMethodOopDesc::set_inlined_tables_length(
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111 int checked_exceptions_len,
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112 int compressed_line_number_size,
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113 int localvariable_table_len,
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114 int exception_table_len) {
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115 // Must be done in the order below, otherwise length_addr accessors
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116 // will not work. Only set bit in header if length is positive.
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117 assert(_flags == 0, "Error");
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118 if (compressed_line_number_size > 0) {
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119 _flags |= _has_linenumber_table;
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120 }
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121 if (checked_exceptions_len > 0) {
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122 _flags |= _has_checked_exceptions;
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123 *(checked_exceptions_length_addr()) = checked_exceptions_len;
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124 }
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125 if (exception_table_len > 0) {
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126 _flags |= _has_exception_table;
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127 *(exception_table_length_addr()) = exception_table_len;
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128 }
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129 if (localvariable_table_len > 0) {
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130 _flags |= _has_localvariable_table;
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131 *(localvariable_table_length_addr()) = localvariable_table_len;
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132 }
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133 }
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134
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136 int constMethodOopDesc::checked_exceptions_length() const {
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137 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
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138 }
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139
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140
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141 CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const {
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142 u2* addr = checked_exceptions_length_addr();
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143 u2 length = *addr;
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144 assert(length > 0, "should only be called if table is present");
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145 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
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146 return (CheckedExceptionElement*) addr;
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147 }
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148
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149
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150 int constMethodOopDesc::localvariable_table_length() const {
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151 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
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152 }
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153
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154
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155 LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const {
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156 u2* addr = localvariable_table_length_addr();
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157 u2 length = *addr;
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158 assert(length > 0, "should only be called if table is present");
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159 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
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160 return (LocalVariableTableElement*) addr;
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161 }
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162
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163 int constMethodOopDesc::exception_table_length() const {
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164 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
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165 }
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166
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167 ExceptionTableElement* constMethodOopDesc::exception_table_start() const {
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168 u2* addr = exception_table_length_addr();
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169 u2 length = *addr;
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170 assert(length > 0, "should only be called if table is present");
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171 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
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172 return (ExceptionTableElement*)addr;
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173 }