1 /* |
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2 * Copyright (c) 2008, 2010, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.dyn; |
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27 |
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28 import sun.dyn.util.VerifyType; |
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29 import sun.dyn.util.Wrapper; |
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30 import java.dyn.*; |
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31 import java.util.List; |
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32 import sun.dyn.MethodHandleNatives.Constants; |
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33 import static sun.dyn.MethodHandleImpl.IMPL_LOOKUP; |
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34 import static sun.dyn.MemberName.newIllegalArgumentException; |
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35 |
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36 /** |
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37 * The flavor of method handle which emulates an invoke instruction |
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38 * on a predetermined argument. The JVM dispatches to the correct method |
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39 * when the handle is created, not when it is invoked. |
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40 * @author jrose |
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41 */ |
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42 public class BoundMethodHandle extends MethodHandle { |
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43 //MethodHandle vmtarget; // next BMH or final DMH or methodOop |
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44 private final Object argument; // argument to insert |
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45 private final int vmargslot; // position at which it is inserted |
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46 |
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47 private static final Access IMPL_TOKEN = Access.getToken(); |
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48 private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory(IMPL_TOKEN); |
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49 |
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50 // Constructors in this class *must* be package scoped or private. |
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51 |
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52 /** Bind a direct MH to its receiver (or first ref. argument). |
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53 * The JVM will pre-dispatch the MH if it is not already static. |
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54 */ |
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55 BoundMethodHandle(DirectMethodHandle mh, Object argument) { |
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56 super(Access.TOKEN, mh.type().dropParameterTypes(0, 1)); |
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57 // check the type now, once for all: |
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58 this.argument = checkReferenceArgument(argument, mh, 0); |
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59 this.vmargslot = this.type().parameterSlotCount(); |
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60 if (MethodHandleNatives.JVM_SUPPORT) { |
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61 this.vmtarget = null; // maybe updated by JVM |
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62 MethodHandleNatives.init(this, mh, 0); |
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63 } else { |
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64 this.vmtarget = mh; |
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65 } |
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66 } |
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67 |
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68 /** Insert an argument into an arbitrary method handle. |
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69 * If argnum is zero, inserts the first argument, etc. |
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70 * The argument type must be a reference. |
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71 */ |
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72 BoundMethodHandle(MethodHandle mh, Object argument, int argnum) { |
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73 this(mh.type().dropParameterTypes(argnum, argnum+1), |
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74 mh, argument, argnum); |
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75 } |
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76 |
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77 /** Insert an argument into an arbitrary method handle. |
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78 * If argnum is zero, inserts the first argument, etc. |
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79 */ |
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80 BoundMethodHandle(MethodType type, MethodHandle mh, Object argument, int argnum) { |
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81 super(Access.TOKEN, type); |
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82 if (mh.type().parameterType(argnum).isPrimitive()) |
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83 this.argument = bindPrimitiveArgument(argument, mh, argnum); |
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84 else { |
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85 this.argument = checkReferenceArgument(argument, mh, argnum); |
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86 } |
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87 this.vmargslot = type.parameterSlotDepth(argnum); |
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88 initTarget(mh, argnum); |
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89 } |
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90 |
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91 private void initTarget(MethodHandle mh, int argnum) { |
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92 if (MethodHandleNatives.JVM_SUPPORT) { |
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93 this.vmtarget = null; // maybe updated by JVM |
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94 MethodHandleNatives.init(this, mh, argnum); |
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95 } else { |
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96 this.vmtarget = mh; |
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97 } |
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98 } |
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99 |
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100 /** For the AdapterMethodHandle subclass. |
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101 */ |
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102 BoundMethodHandle(MethodType type, Object argument, int vmargslot) { |
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103 super(Access.TOKEN, type); |
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104 this.argument = argument; |
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105 this.vmargslot = vmargslot; |
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106 assert(this instanceof AdapterMethodHandle); |
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107 } |
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108 |
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109 /** Initialize the current object as a self-bound method handle, binding it |
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110 * as the first argument of the method handle {@code entryPoint}. |
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111 * The invocation type of the resulting method handle will be the |
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112 * same as {@code entryPoint}, except that the first argument |
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113 * type will be dropped. |
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114 */ |
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115 protected BoundMethodHandle(Access token, MethodHandle entryPoint) { |
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116 super(token, entryPoint.type().dropParameterTypes(0, 1)); |
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117 this.argument = this; // kludge; get rid of |
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118 this.vmargslot = this.type().parameterSlotDepth(0); |
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119 initTarget(entryPoint, 0); |
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120 } |
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121 |
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122 /** Make sure the given {@code argument} can be used as {@code argnum}-th |
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123 * parameter of the given method handle {@code mh}, which must be a reference. |
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124 * <p> |
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125 * If this fails, throw a suitable {@code WrongMethodTypeException}, |
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126 * which will prevent the creation of an illegally typed bound |
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127 * method handle. |
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128 */ |
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129 final static Object checkReferenceArgument(Object argument, MethodHandle mh, int argnum) { |
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130 Class<?> ptype = mh.type().parameterType(argnum); |
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131 if (ptype.isPrimitive()) { |
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132 // fail |
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133 } else if (argument == null) { |
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134 return null; |
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135 } else if (VerifyType.isNullReferenceConversion(argument.getClass(), ptype)) { |
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136 return argument; |
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137 } |
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138 throw badBoundArgumentException(argument, mh, argnum); |
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139 } |
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140 |
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141 /** Make sure the given {@code argument} can be used as {@code argnum}-th |
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142 * parameter of the given method handle {@code mh}, which must be a primitive. |
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143 * <p> |
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144 * If this fails, throw a suitable {@code WrongMethodTypeException}, |
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145 * which will prevent the creation of an illegally typed bound |
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146 * method handle. |
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147 */ |
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148 final static Object bindPrimitiveArgument(Object argument, MethodHandle mh, int argnum) { |
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149 Class<?> ptype = mh.type().parameterType(argnum); |
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150 Wrapper wrap = Wrapper.forPrimitiveType(ptype); |
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151 Object zero = wrap.zero(); |
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152 if (zero == null) { |
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153 // fail |
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154 } else if (argument == null) { |
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155 if (ptype != int.class && wrap.isSubwordOrInt()) |
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156 return Integer.valueOf(0); |
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157 else |
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158 return zero; |
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159 } else if (VerifyType.isNullReferenceConversion(argument.getClass(), zero.getClass())) { |
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160 if (ptype != int.class && wrap.isSubwordOrInt()) |
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161 return Wrapper.INT.wrap(argument); |
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162 else |
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163 return argument; |
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164 } |
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165 throw badBoundArgumentException(argument, mh, argnum); |
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166 } |
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167 |
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168 final static RuntimeException badBoundArgumentException(Object argument, MethodHandle mh, int argnum) { |
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169 String atype = (argument == null) ? "null" : argument.getClass().toString(); |
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170 return new WrongMethodTypeException("cannot bind "+atype+" argument to parameter #"+argnum+" of "+mh.type()); |
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171 } |
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172 |
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173 @Override |
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174 public String toString() { |
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175 return MethodHandleImpl.addTypeString(baseName(), this); |
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176 } |
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177 |
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178 /** Component of toString() before the type string. */ |
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179 protected String baseName() { |
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180 MethodHandle mh = this; |
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181 while (mh instanceof BoundMethodHandle) { |
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182 Object info = MethodHandleNatives.getTargetInfo(mh); |
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183 if (info instanceof MethodHandle) { |
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184 mh = (MethodHandle) info; |
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185 } else { |
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186 String name = null; |
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187 if (info instanceof MemberName) |
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188 name = ((MemberName)info).getName(); |
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189 if (name != null) |
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190 return name; |
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191 else |
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192 return noParens(super.toString()); // "invoke", probably |
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193 } |
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194 assert(mh != this); |
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195 } |
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196 return noParens(mh.toString()); |
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197 } |
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198 |
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199 private static String noParens(String str) { |
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200 int paren = str.indexOf('('); |
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201 if (paren >= 0) str = str.substring(0, paren); |
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202 return str; |
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203 } |
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204 } |
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