1 | /* |
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2 | * MemoryClassLoader.java |
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3 | * |
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4 | * Copyright (C) 2011 Erik Huelsmann |
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5 | * Copyright (C) 2010 Alessio Stalla |
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6 | * $Id: MemoryClassLoader.java 14363 2013-01-29 08:36:14Z mevenson $ |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU General Public License |
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10 | * as published by the Free Software Foundation; either version 2 |
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11 | * of the License, or (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with this program; if not, write to the Free Software |
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20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 | * |
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22 | * As a special exception, the copyright holders of this library give you |
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23 | * permission to link this library with independent modules to produce an |
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24 | * executable, regardless of the license terms of these independent |
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25 | * modules, and to copy and distribute the resulting executable under |
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26 | * terms of your choice, provided that you also meet, for each linked |
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27 | * independent module, the terms and conditions of the license of that |
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28 | * module. An independent module is a module which is not derived from |
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29 | * or based on this library. If you modify this library, you may extend |
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30 | * this exception to your version of the library, but you are not |
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31 | * obligated to do so. If you do not wish to do so, delete this |
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32 | * exception statement from your version. |
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33 | */ |
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34 | |
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35 | package org.armedbear.lisp; |
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36 | |
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37 | import static org.armedbear.lisp.Lisp.*; |
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38 | |
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39 | import java.util.*; |
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40 | |
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41 | public class MemoryClassLoader extends JavaClassLoader { |
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42 | |
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43 | private final HashMap<String, JavaObject> hashtable = new HashMap<String, JavaObject>(); |
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44 | private final JavaObject boxedThis = new JavaObject(this); |
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45 | private final String internalNamePrefix; |
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46 | |
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47 | public MemoryClassLoader() { |
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48 | this("org/armedbear/lisp/"); |
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49 | } |
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50 | |
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51 | public MemoryClassLoader(String internalNamePrefix) { |
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52 | this.internalNamePrefix = internalNamePrefix; |
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53 | } |
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54 | |
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55 | public MemoryClassLoader(JavaClassLoader parent) { |
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56 | super(parent); |
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57 | this.internalNamePrefix = ""; |
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58 | } |
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59 | |
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60 | @Override |
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61 | protected Class<?> loadClass(String name, boolean resolve) |
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62 | throws ClassNotFoundException { |
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63 | /* First we check if we should load the class ourselves, |
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64 | * allowing the default handlers to kick in if we don't... |
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65 | * |
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66 | * This strategy eliminates ClassNotFound exceptions inside |
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67 | * the inherited loadClass() eliminated ~80k exceptions during |
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68 | * Maxima compilation. Generally, creation of an exception object |
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69 | * is a pretty heavy operation, because it processes the call stack, |
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70 | * which - in ABCL - is pretty deep, most of the time. |
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71 | */ |
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72 | if (hashtable.containsKey(name)) { |
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73 | String internalName = internalNamePrefix + name; |
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74 | Class<?> c = this.findLoadedClass(internalName); |
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75 | |
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76 | if (c == null) { |
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77 | c = findClass(name); |
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78 | } |
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79 | if (c != null) { |
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80 | if (resolve) { |
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81 | resolveClass(c); |
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82 | } |
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83 | return c; |
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84 | } |
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85 | } |
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86 | |
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87 | if (checkPreCompiledClassLoader) { |
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88 | Class<?> c = findPrecompiledClassOrNull(name); |
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89 | if (c != null) { |
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90 | return c; |
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91 | } |
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92 | } |
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93 | |
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94 | // Fall through to our super's default handling |
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95 | return super.loadClass(name, resolve); |
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96 | } |
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97 | |
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98 | @Override |
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99 | protected Class<?> findClass(String name) throws ClassNotFoundException { |
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100 | try { |
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101 | if (checkPreCompiledClassLoader) { |
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102 | Class<?> c = findPrecompiledClassOrNull(name); |
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103 | if (c != null) |
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104 | return c; |
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105 | } |
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106 | byte[] b = getFunctionClassBytes(name); |
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107 | return defineLispClass(name, b, 0, b.length); |
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108 | } catch(Throwable e) { //TODO handle this better, readFunctionBytes uses Debug.assert() but should return null |
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109 | e.printStackTrace(); |
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110 | if(e instanceof ControlTransfer) { throw (ControlTransfer) e; } |
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111 | throw new ClassNotFoundException("Function class not found: " + name, e); |
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112 | } |
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113 | } |
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114 | |
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115 | public byte[] getFunctionClassBytes(String name) { |
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116 | if (hashtable.containsKey(name)) { |
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117 | return (byte[])hashtable.get(name).javaInstance(); |
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118 | } |
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119 | return super.getFunctionClassBytes(name); |
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120 | } |
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121 | |
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122 | public LispObject loadFunction(String name) { |
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123 | try { |
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124 | Class clz = loadClass(name); |
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125 | Function f = (Function) clz.newInstance(); |
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126 | getFunctionClassBytes(f); //as a side effect it sets them |
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127 | return f; |
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128 | } catch(Throwable e) { |
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129 | if(e instanceof ControlTransfer) { throw (ControlTransfer) e; } |
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130 | Debug.trace(e); |
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131 | return error(new LispError("Compiled function can't be loaded: " + name + " from memory")); |
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132 | } |
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133 | } |
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134 | |
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135 | private static final Primitive MAKE_MEMORY_CLASS_LOADER = new pf_make_memory_class_loader(); |
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136 | private static final class pf_make_memory_class_loader extends Primitive { |
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137 | pf_make_memory_class_loader() { |
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138 | super("make-memory-class-loader", PACKAGE_SYS, false); |
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139 | } |
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140 | |
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141 | @Override |
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142 | public LispObject execute() { |
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143 | return new MemoryClassLoader().boxedThis; |
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144 | } |
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145 | }; |
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146 | |
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147 | private static final Primitive PUT_MEMORY_FUNCTION = new pf_put_memory_function(); |
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148 | private static final class pf_put_memory_function extends Primitive { |
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149 | pf_put_memory_function() { |
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150 | super("put-memory-function", PACKAGE_SYS, false, "loader class-name class-bytes"); |
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151 | } |
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152 | |
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153 | @Override |
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154 | public LispObject execute(LispObject loader, LispObject className, LispObject classBytes) { |
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155 | MemoryClassLoader l = (MemoryClassLoader) loader.javaInstance(MemoryClassLoader.class); |
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156 | return (LispObject)l.hashtable.put(className.getStringValue(), (JavaObject)classBytes); |
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157 | } |
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158 | }; |
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159 | |
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160 | private static final Primitive GET_MEMORY_FUNCTION = new pf_get_memory_function(); |
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161 | private static final class pf_get_memory_function extends Primitive { |
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162 | pf_get_memory_function() { |
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163 | super("get-memory-function", PACKAGE_SYS, false, "loader class-name"); |
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164 | } |
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165 | |
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166 | @Override |
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167 | public LispObject execute(LispObject loader, LispObject name) { |
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168 | MemoryClassLoader l = (MemoryClassLoader) loader.javaInstance(MemoryClassLoader.class); |
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169 | return l.loadFunction(name.getStringValue()); |
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170 | } |
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171 | }; |
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172 | } |
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173 | |
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