1 | /* |
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2 | * Function.java |
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3 | * |
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4 | * Copyright (C) 2002-2005 Peter Graves |
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5 | * $Id: Function.java 15569 2022-03-19 12:50:18Z mevenson $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import java.io.*; |
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37 | import java.io.ByteArrayInputStream; |
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38 | import java.io.ByteArrayOutputStream; |
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39 | |
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40 | import static org.armedbear.lisp.Lisp.*; |
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41 | |
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42 | public abstract class Function extends Operator implements Serializable { |
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43 | private LispObject propertyList = NIL; |
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44 | private int callCount; |
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45 | private int hotCount; |
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46 | /** |
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47 | * The value of *load-truename* which was current when this function |
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48 | * was loaded, used for fetching the class bytes in case of disassembly. |
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49 | */ |
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50 | public final LispObject loadedFrom; |
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51 | |
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52 | protected Function() { |
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53 | LispObject loadTruename = Symbol.LOAD_TRUENAME.symbolValueNoThrow(); |
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54 | LispObject loadTruenameFasl = Symbol.LOAD_TRUENAME_FASL.symbolValueNoThrow(); |
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55 | loadedFrom = loadTruenameFasl != null ? loadTruenameFasl : (loadTruename != null ? loadTruename : NIL); |
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56 | } |
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57 | |
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58 | public Function(String name) |
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59 | { |
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60 | this(name, (String)null); |
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61 | } |
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62 | |
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63 | public Function(String name, String arglist) |
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64 | { |
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65 | this(); |
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66 | if(arglist != null) |
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67 | setLambdaList(new SimpleString(arglist)); |
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68 | if (name != null) { |
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69 | Symbol symbol = Symbol.addFunction(name.toUpperCase(), this); |
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70 | if (cold) |
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71 | symbol.setBuiltInFunction(true); |
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72 | setLambdaName(symbol); |
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73 | } |
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74 | } |
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75 | |
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76 | public Function(Symbol symbol) |
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77 | { |
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78 | this(symbol, null, null); |
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79 | } |
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80 | |
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81 | public Function(Symbol symbol, String arglist) |
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82 | { |
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83 | this(symbol, arglist, null); |
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84 | } |
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85 | |
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86 | public Function(Symbol symbol, String arglist, String docstring) |
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87 | { |
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88 | this(); |
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89 | symbol.setSymbolFunction(this); |
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90 | if (cold) |
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91 | symbol.setBuiltInFunction(true); |
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92 | setLambdaName(symbol); |
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93 | if(arglist != null) |
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94 | setLambdaList(new SimpleString(arglist)); |
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95 | if (docstring != null) |
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96 | symbol.setDocumentation(Symbol.FUNCTION, |
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97 | new SimpleString(docstring)); |
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98 | } |
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99 | |
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100 | public Function(String name, Package pkg) |
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101 | { |
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102 | this(name, pkg, false); |
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103 | } |
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104 | |
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105 | public Function(String name, Package pkg, boolean exported) |
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106 | { |
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107 | this(name, pkg, exported, null, null); |
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108 | } |
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109 | |
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110 | public Function(String name, Package pkg, boolean exported, |
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111 | String arglist) |
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112 | { |
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113 | this(name, pkg, exported, arglist, null); |
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114 | } |
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115 | |
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116 | public Function(String name, Package pkg, boolean exported, |
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117 | String arglist, String docstring) |
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118 | { |
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119 | this(); |
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120 | if (arglist instanceof String) |
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121 | setLambdaList(new SimpleString(arglist)); |
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122 | if (name != null) { |
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123 | Symbol symbol; |
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124 | if (exported) |
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125 | symbol = pkg.internAndExport(name.toUpperCase()); |
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126 | else |
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127 | symbol = pkg.intern(name.toUpperCase()); |
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128 | symbol.setSymbolFunction(this); |
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129 | if (cold) |
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130 | symbol.setBuiltInFunction(true); |
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131 | setLambdaName(symbol); |
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132 | if (docstring != null) |
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133 | symbol.setDocumentation(Symbol.FUNCTION, |
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134 | new SimpleString(docstring)); |
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135 | } |
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136 | } |
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137 | |
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138 | public Function(LispObject name) |
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139 | { |
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140 | this(); |
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141 | setLambdaName(name); |
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142 | } |
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143 | |
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144 | public Function(LispObject name, LispObject lambdaList) |
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145 | { |
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146 | this(); |
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147 | setLambdaName(name); |
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148 | setLambdaList(lambdaList); |
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149 | } |
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150 | |
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151 | @Override |
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152 | public LispObject typeOf() |
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153 | { |
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154 | return Symbol.FUNCTION; |
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155 | } |
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156 | |
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157 | @Override |
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158 | public LispObject classOf() |
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159 | { |
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160 | return BuiltInClass.FUNCTION; |
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161 | } |
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162 | |
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163 | @Override |
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164 | public LispObject typep(LispObject typeSpecifier) |
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165 | { |
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166 | if (typeSpecifier == Symbol.FUNCTION) |
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167 | return T; |
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168 | if (typeSpecifier == Symbol.COMPILED_FUNCTION) |
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169 | return T; |
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170 | if (typeSpecifier == BuiltInClass.FUNCTION) |
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171 | return T; |
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172 | return super.typep(typeSpecifier); |
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173 | } |
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174 | |
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175 | @Override |
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176 | public final LispObject getPropertyList() |
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177 | { |
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178 | if (propertyList == null) |
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179 | propertyList = NIL; |
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180 | return propertyList; |
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181 | } |
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182 | |
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183 | @Override |
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184 | public final void setPropertyList(LispObject obj) |
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185 | { |
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186 | if (obj == null) |
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187 | throw new NullPointerException(); |
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188 | propertyList = obj; |
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189 | } |
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190 | |
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191 | public final void setClassBytes(byte[] bytes) |
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192 | { |
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193 | propertyList = putf(propertyList, Symbol.CLASS_BYTES, |
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194 | new JavaObject(bytes)); |
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195 | } |
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196 | |
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197 | public final LispObject getClassBytes() { |
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198 | LispObject o = getf(propertyList, Symbol.CLASS_BYTES, NIL); |
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199 | if(o != NIL) { |
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200 | return o; |
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201 | } else { |
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202 | ClassLoader c = getClass().getClassLoader(); |
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203 | if(c instanceof JavaClassLoader) { |
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204 | final LispThread thread = LispThread.currentThread(); |
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205 | SpecialBindingsMark mark = thread.markSpecialBindings(); |
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206 | try { |
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207 | thread.bindSpecial(Symbol.LOAD_TRUENAME, loadedFrom); |
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208 | return new JavaObject(((JavaClassLoader) c).getFunctionClassBytes(this)); |
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209 | } catch(Throwable t) { |
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210 | //This is because unfortunately getFunctionClassBytes uses |
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211 | //Debug.assertTrue(false) to signal errors |
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212 | if(t instanceof ControlTransfer) { |
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213 | throw (ControlTransfer) t; |
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214 | } else { |
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215 | return NIL; |
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216 | } |
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217 | } finally { |
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218 | thread.resetSpecialBindings(mark); |
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219 | } |
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220 | } else { |
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221 | return NIL; |
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222 | } |
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223 | } |
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224 | } |
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225 | |
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226 | public static final Primitive FUNCTION_CLASS_BYTES = new pf_function_class_bytes(); |
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227 | public static final class pf_function_class_bytes extends Primitive { |
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228 | public pf_function_class_bytes() { |
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229 | super("function-class-bytes", PACKAGE_SYS, false, "function"); |
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230 | } |
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231 | @Override |
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232 | public LispObject execute(LispObject arg) { |
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233 | if (arg instanceof Function) { |
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234 | return ((Function) arg).getClassBytes(); |
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235 | } |
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236 | return type_error(arg, Symbol.FUNCTION); |
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237 | } |
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238 | } |
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239 | |
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240 | @Override |
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241 | public LispObject execute() |
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242 | { |
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243 | return error(new WrongNumberOfArgumentsException(this, 0)); |
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244 | } |
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245 | |
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246 | @Override |
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247 | public LispObject execute(LispObject arg) |
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248 | { |
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249 | return error(new WrongNumberOfArgumentsException(this, 1)); |
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250 | } |
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251 | |
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252 | @Override |
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253 | public LispObject execute(LispObject first, LispObject second) |
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254 | |
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255 | { |
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256 | return error(new WrongNumberOfArgumentsException(this, 2)); |
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257 | } |
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258 | |
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259 | @Override |
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260 | public LispObject execute(LispObject first, LispObject second, |
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261 | LispObject third) |
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262 | |
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263 | { |
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264 | return error(new WrongNumberOfArgumentsException(this, 3)); |
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265 | } |
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266 | |
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267 | @Override |
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268 | public LispObject execute(LispObject first, LispObject second, |
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269 | LispObject third, LispObject fourth) |
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270 | |
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271 | { |
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272 | return error(new WrongNumberOfArgumentsException(this, 4)); |
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273 | } |
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274 | |
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275 | @Override |
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276 | public LispObject execute(LispObject first, LispObject second, |
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277 | LispObject third, LispObject fourth, |
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278 | LispObject fifth) |
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279 | |
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280 | { |
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281 | return error(new WrongNumberOfArgumentsException(this, 5)); |
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282 | } |
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283 | |
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284 | @Override |
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285 | public LispObject execute(LispObject first, LispObject second, |
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286 | LispObject third, LispObject fourth, |
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287 | LispObject fifth, LispObject sixth) |
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288 | |
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289 | { |
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290 | return error(new WrongNumberOfArgumentsException(this, 6)); |
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291 | } |
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292 | |
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293 | @Override |
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294 | public LispObject execute(LispObject first, LispObject second, |
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295 | LispObject third, LispObject fourth, |
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296 | LispObject fifth, LispObject sixth, |
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297 | LispObject seventh) |
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298 | |
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299 | { |
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300 | return error(new WrongNumberOfArgumentsException(this, 7)); |
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301 | } |
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302 | |
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303 | @Override |
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304 | public LispObject execute(LispObject first, LispObject second, |
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305 | LispObject third, LispObject fourth, |
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306 | LispObject fifth, LispObject sixth, |
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307 | LispObject seventh, LispObject eighth) |
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308 | |
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309 | { |
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310 | return error(new WrongNumberOfArgumentsException(this, 8)); |
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311 | } |
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312 | |
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313 | @Override |
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314 | public LispObject execute(LispObject[] args) |
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315 | { |
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316 | return error(new WrongNumberOfArgumentsException(this)); |
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317 | } |
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318 | |
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319 | @Override |
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320 | public String printObject() |
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321 | { |
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322 | LispObject name = getLambdaName(); |
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323 | if (name != null && name != NIL) { |
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324 | return unreadableString(name.princToString()); |
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325 | } |
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326 | // No name. |
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327 | LispObject lambdaList = getLambdaList(); |
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328 | if (lambdaList != null) { |
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329 | StringBuilder sb = new StringBuilder("FUNCTION "); |
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330 | sb.append("(LAMBDA "); |
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331 | if (lambdaList == NIL) { |
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332 | sb.append("()"); |
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333 | } else { |
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334 | final LispThread thread = LispThread.currentThread(); |
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335 | final SpecialBindingsMark mark = thread.markSpecialBindings(); |
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336 | thread.bindSpecial(Symbol.PRINT_LENGTH, Fixnum.THREE); |
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337 | try { |
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338 | sb.append(lambdaList.printObject()); |
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339 | } |
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340 | finally { |
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341 | thread.resetSpecialBindings(mark); |
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342 | } |
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343 | } |
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344 | sb.append(")"); |
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345 | return unreadableString(sb.toString()); |
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346 | } |
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347 | return unreadableString("FUNCTION"); |
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348 | } |
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349 | |
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350 | // Used by the JVM compiler. |
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351 | public final void argCountError() |
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352 | { |
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353 | error(new WrongNumberOfArgumentsException(this)); |
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354 | } |
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355 | |
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356 | // Profiling. |
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357 | @Override |
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358 | public final int getCallCount() |
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359 | { |
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360 | return callCount; |
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361 | } |
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362 | |
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363 | @Override |
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364 | public void setCallCount(int n) |
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365 | { |
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366 | callCount = n; |
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367 | } |
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368 | |
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369 | @Override |
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370 | public final void incrementCallCount() |
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371 | { |
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372 | ++callCount; |
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373 | } |
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374 | |
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375 | @Override |
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376 | public final int getHotCount() |
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377 | { |
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378 | return hotCount; |
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379 | } |
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380 | |
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381 | @Override |
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382 | public void setHotCount(int n) |
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383 | { |
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384 | hotCount = n; |
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385 | } |
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386 | |
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387 | @Override |
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388 | public final void incrementHotCount() |
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389 | { |
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390 | ++hotCount; |
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391 | } |
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392 | |
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393 | //Serialization |
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394 | public static class SerializedNamedFunction implements Serializable { |
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395 | private final Symbol name; |
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396 | public SerializedNamedFunction(Symbol name) { |
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397 | this.name = name; |
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398 | } |
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399 | |
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400 | public Object readResolve() { |
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401 | return name.getSymbolFunctionOrDie(); |
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402 | } |
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403 | } |
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404 | |
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405 | public static class ObjectInputStreamWithClassLoader extends ObjectInputStream { |
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406 | private final ClassLoader classLoader; |
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407 | public ObjectInputStreamWithClassLoader(InputStream in, ClassLoader classLoader) throws IOException { |
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408 | super(in); |
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409 | this.classLoader = classLoader; |
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410 | } |
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411 | |
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412 | @Override |
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413 | protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException { |
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414 | return Class.forName(desc.getName(), false, classLoader); |
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415 | } |
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416 | } |
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417 | |
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418 | public static class SerializedLocalFunction implements Serializable { |
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419 | final LispObject className; |
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420 | final LispObject classBytes; |
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421 | final byte[] serializedFunction; |
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422 | |
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423 | public SerializedLocalFunction(Function function) { |
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424 | this.className = new SimpleString(function.getClass().getName()); |
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425 | this.classBytes = function.getClassBytes(); |
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426 | serializingClosure.set(true); |
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427 | try { |
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428 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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429 | new ObjectOutputStream(baos).writeObject(function); |
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430 | serializedFunction = baos.toByteArray(); |
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431 | } catch (IOException e) { |
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432 | throw new RuntimeException(e); |
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433 | } finally { |
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434 | serializingClosure.remove(); |
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435 | } |
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436 | } |
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437 | |
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438 | public Object readResolve() throws InvalidObjectException { |
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439 | MemoryClassLoader loader = new MemoryClassLoader(); |
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440 | MemoryClassLoader.PUT_MEMORY_FUNCTION.execute(JavaObject.getInstance(loader), className, classBytes); |
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441 | try { |
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442 | ByteArrayInputStream in = new ByteArrayInputStream(serializedFunction); |
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443 | return new ObjectInputStreamWithClassLoader(in, loader).readObject(); |
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444 | } catch (Exception e) { |
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445 | InvalidObjectException ex = new InvalidObjectException("Could not read the serialized function back"); |
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446 | ex.initCause(e); |
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447 | throw ex; |
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448 | } |
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449 | } |
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450 | } |
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451 | |
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452 | private static final ThreadLocal<Boolean> serializingClosure = new ThreadLocal<Boolean>(); |
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453 | |
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454 | public Object writeReplace() throws ObjectStreamException { |
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455 | if(shouldSerializeByName()) { |
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456 | return new SerializedNamedFunction((Symbol) getLambdaName()); |
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457 | } else if(getClassBytes() == NIL || serializingClosure.get() != null) { |
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458 | return this; |
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459 | } else { |
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460 | return new SerializedLocalFunction(this); |
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461 | } |
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462 | } |
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463 | |
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464 | protected boolean shouldSerializeByName() { |
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465 | LispObject lambdaName = getLambdaName(); |
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466 | return lambdaName instanceof Symbol && lambdaName.getSymbolFunction() == this; |
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467 | } |
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468 | } |
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