15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.internal.runtime.linker; 27 28 import static jdk.nashorn.internal.lookup.Lookup.MH; 29 30 import java.lang.invoke.MethodHandle; 31 import java.lang.invoke.MethodHandles; 32 import java.lang.reflect.Modifier; 33 import java.util.Deque; 34 import java.util.List; 35 import jdk.internal.dynalink.CallSiteDescriptor; 36 import jdk.internal.dynalink.linker.ConversionComparator; 37 import jdk.internal.dynalink.linker.GuardedInvocation; 38 import jdk.internal.dynalink.linker.GuardingTypeConverterFactory; 39 import jdk.internal.dynalink.linker.LinkRequest; 40 import jdk.internal.dynalink.linker.LinkerServices; 41 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; 42 import jdk.internal.dynalink.support.Guards; 43 import jdk.nashorn.internal.objects.NativeArray; 44 import jdk.nashorn.internal.runtime.JSType; 45 import jdk.nashorn.internal.runtime.ScriptFunction; 46 import jdk.nashorn.internal.runtime.ScriptObject; 47 import jdk.nashorn.internal.runtime.Undefined; 48 49 /** 50 * This is the main dynamic linker for Nashorn. It is used for linking all {@link ScriptObject} and its subclasses (this 51 * includes {@link ScriptFunction} and its subclasses) as well as {@link Undefined}. 52 */ 53 final class NashornLinker implements TypeBasedGuardingDynamicLinker, GuardingTypeConverterFactory, ConversionComparator { 54 private static final ClassValue<MethodHandle> ARRAY_CONVERTERS = new ClassValue<MethodHandle>() { 55 @Override 56 protected MethodHandle computeValue(Class<?> type) { 57 return createArrayConverter(type); 58 } 59 }; 60 61 /** 62 * Returns true if {@code ScriptObject} is assignable from {@code type}, or it is {@code Undefined}. 63 */ 98 final GuardedInvocation gi = convertToTypeNoCast(sourceType, targetType); 99 return gi == null ? null : gi.asType(MH.type(targetType, sourceType)); 100 } 101 102 /** 103 * Main part of the implementation of {@link GuardingTypeConverterFactory#convertToType(Class, Class)} that doesn't 104 * care about adapting the method signature; that's done by the invoking method. Returns either a built-in 105 * conversion to primitive (or primitive wrapper) Java types or to String, or a just-in-time generated converter to 106 * a SAM type (if the target type is a SAM type). 107 * @param sourceType the source type 108 * @param targetType the target type 109 * @return a guarded invocation that converts from the source type to the target type. 110 * @throws Exception if something goes wrong 111 */ 112 private static GuardedInvocation convertToTypeNoCast(final Class<?> sourceType, final Class<?> targetType) throws Exception { 113 final MethodHandle mh = JavaArgumentConverters.getConverter(targetType); 114 if (mh != null) { 115 return new GuardedInvocation(mh, canLinkTypeStatic(sourceType) ? null : IS_NASHORN_OR_UNDEFINED_TYPE); 116 } 117 118 GuardedInvocation inv = getArrayConverter(sourceType, targetType); 119 if(inv != null) { 120 return inv; 121 } 122 123 return getSamTypeConverter(sourceType, targetType); 124 } 125 126 /** 127 * Returns a guarded invocation that converts from a source type that is ScriptFunction, or a subclass or a 128 * superclass of it) to a SAM type. 129 * @param sourceType the source type (presumably ScriptFunction or a subclass or a superclass of it) 130 * @param targetType the target type (presumably a SAM type) 131 * @return a guarded invocation that converts from the source type to the target SAM type. null is returned if 132 * either the source type is neither ScriptFunction, nor a subclass, nor a superclass of it, or if the target type 133 * is not a SAM type. 134 * @throws Exception if something goes wrong; generally, if there's an issue with creation of the SAM proxy type 135 * constructor. 136 */ 137 private static GuardedInvocation getSamTypeConverter(final Class<?> sourceType, final Class<?> targetType) throws Exception { 138 // If source type is more generic than ScriptFunction class, we'll need to use a guard 139 final boolean isSourceTypeGeneric = sourceType.isAssignableFrom(ScriptFunction.class); 140 164 final MethodHandle guard = isSourceTypeGeneric ? IS_NATIVE_ARRAY : null; 165 if(targetType.isArray()) { 166 return new GuardedInvocation(ARRAY_CONVERTERS.get(targetType), guard); 167 } 168 if(targetType == List.class) { 169 return new GuardedInvocation(JSType.TO_JAVA_LIST.methodHandle(), guard); 170 } 171 if(targetType == Deque.class) { 172 return new GuardedInvocation(JSType.TO_JAVA_DEQUE.methodHandle(), guard); 173 } 174 } 175 return null; 176 } 177 178 private static MethodHandle createArrayConverter(final Class<?> type) { 179 assert type.isArray(); 180 final MethodHandle converter = MH.insertArguments(JSType.TO_JAVA_ARRAY.methodHandle(), 1, type.getComponentType()); 181 return MH.asType(converter, converter.type().changeReturnType(type)); 182 } 183 184 private static boolean isAutoConvertibleFromFunction(final Class<?> clazz) { 185 return isAbstractClass(clazz) && !ScriptObject.class.isAssignableFrom(clazz) && 186 JavaAdapterFactory.isAutoConvertibleFromFunction(clazz); 187 } 188 189 /** 190 * Utility method used by few other places in the code. Tests if the class has the abstract modifier and is not an 191 * array class. For some reason, array classes have the abstract modifier set in HotSpot JVM, and we don't want to 192 * treat array classes as abstract. 193 * @param clazz the inspected class 194 * @return true if the class is abstract and is not an array type. 195 */ 196 static boolean isAbstractClass(final Class<?> clazz) { 197 return Modifier.isAbstract(clazz.getModifiers()) && !clazz.isArray(); 198 } 199 200 201 @Override 202 public Comparison compareConversion(final Class<?> sourceType, final Class<?> targetType1, final Class<?> targetType2) { 203 if(sourceType == NativeArray.class) { 218 return Comparison.TYPE_2_BETTER; 219 } 220 } 221 if(ScriptObject.class.isAssignableFrom(sourceType)) { 222 // Prefer interfaces 223 if(targetType1.isInterface()) { 224 if(!targetType2.isInterface()) { 225 return Comparison.TYPE_1_BETTER; 226 } 227 } else if(targetType2.isInterface()) { 228 return Comparison.TYPE_2_BETTER; 229 } 230 } 231 return Comparison.INDETERMINATE; 232 } 233 234 private static boolean isList(Class<?> clazz) { 235 return clazz == List.class || clazz == Deque.class; 236 } 237 238 private static final MethodHandle IS_SCRIPT_FUNCTION = Guards.isInstance(ScriptFunction.class, MH.type(Boolean.TYPE, Object.class)); 239 private static final MethodHandle IS_NATIVE_ARRAY = Guards.isOfClass(NativeArray.class, MH.type(Boolean.TYPE, Object.class)); 240 241 private static final MethodHandle IS_NASHORN_OR_UNDEFINED_TYPE = findOwnMH("isNashornTypeOrUndefined", 242 Boolean.TYPE, Object.class); 243 244 @SuppressWarnings("unused") 245 private static boolean isNashornTypeOrUndefined(final Object obj) { 246 return obj instanceof ScriptObject || obj instanceof Undefined; 247 } 248 249 private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) { 250 return MH.findStatic(MethodHandles.lookup(), NashornLinker.class, name, MH.type(rtype, types)); 251 } 252 } 253 | 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.internal.runtime.linker; 27 28 import static jdk.nashorn.internal.lookup.Lookup.MH; 29 30 import java.lang.invoke.MethodHandle; 31 import java.lang.invoke.MethodHandles; 32 import java.lang.reflect.Modifier; 33 import java.util.Deque; 34 import java.util.List; 35 import java.util.Map; 36 import javax.script.Bindings; 37 import jdk.internal.dynalink.CallSiteDescriptor; 38 import jdk.internal.dynalink.linker.ConversionComparator; 39 import jdk.internal.dynalink.linker.GuardedInvocation; 40 import jdk.internal.dynalink.linker.GuardingTypeConverterFactory; 41 import jdk.internal.dynalink.linker.LinkRequest; 42 import jdk.internal.dynalink.linker.LinkerServices; 43 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; 44 import jdk.internal.dynalink.support.Guards; 45 import jdk.nashorn.api.scripting.JSObject; 46 import jdk.nashorn.api.scripting.ScriptObjectMirror; 47 import jdk.nashorn.internal.objects.NativeArray; 48 import jdk.nashorn.internal.runtime.Context; 49 import jdk.nashorn.internal.runtime.JSType; 50 import jdk.nashorn.internal.runtime.ScriptFunction; 51 import jdk.nashorn.internal.runtime.ScriptObject; 52 import jdk.nashorn.internal.runtime.Undefined; 53 54 /** 55 * This is the main dynamic linker for Nashorn. It is used for linking all {@link ScriptObject} and its subclasses (this 56 * includes {@link ScriptFunction} and its subclasses) as well as {@link Undefined}. 57 */ 58 final class NashornLinker implements TypeBasedGuardingDynamicLinker, GuardingTypeConverterFactory, ConversionComparator { 59 private static final ClassValue<MethodHandle> ARRAY_CONVERTERS = new ClassValue<MethodHandle>() { 60 @Override 61 protected MethodHandle computeValue(Class<?> type) { 62 return createArrayConverter(type); 63 } 64 }; 65 66 /** 67 * Returns true if {@code ScriptObject} is assignable from {@code type}, or it is {@code Undefined}. 68 */ 103 final GuardedInvocation gi = convertToTypeNoCast(sourceType, targetType); 104 return gi == null ? null : gi.asType(MH.type(targetType, sourceType)); 105 } 106 107 /** 108 * Main part of the implementation of {@link GuardingTypeConverterFactory#convertToType(Class, Class)} that doesn't 109 * care about adapting the method signature; that's done by the invoking method. Returns either a built-in 110 * conversion to primitive (or primitive wrapper) Java types or to String, or a just-in-time generated converter to 111 * a SAM type (if the target type is a SAM type). 112 * @param sourceType the source type 113 * @param targetType the target type 114 * @return a guarded invocation that converts from the source type to the target type. 115 * @throws Exception if something goes wrong 116 */ 117 private static GuardedInvocation convertToTypeNoCast(final Class<?> sourceType, final Class<?> targetType) throws Exception { 118 final MethodHandle mh = JavaArgumentConverters.getConverter(targetType); 119 if (mh != null) { 120 return new GuardedInvocation(mh, canLinkTypeStatic(sourceType) ? null : IS_NASHORN_OR_UNDEFINED_TYPE); 121 } 122 123 final GuardedInvocation arrayConverter = getArrayConverter(sourceType, targetType); 124 if(arrayConverter != null) { 125 return arrayConverter; 126 } 127 128 final GuardedInvocation mapConverter = getMirrorConverter(sourceType, targetType); 129 if(mapConverter != null) { 130 return mapConverter; 131 } 132 133 return getSamTypeConverter(sourceType, targetType); 134 } 135 136 /** 137 * Returns a guarded invocation that converts from a source type that is ScriptFunction, or a subclass or a 138 * superclass of it) to a SAM type. 139 * @param sourceType the source type (presumably ScriptFunction or a subclass or a superclass of it) 140 * @param targetType the target type (presumably a SAM type) 141 * @return a guarded invocation that converts from the source type to the target SAM type. null is returned if 142 * either the source type is neither ScriptFunction, nor a subclass, nor a superclass of it, or if the target type 143 * is not a SAM type. 144 * @throws Exception if something goes wrong; generally, if there's an issue with creation of the SAM proxy type 145 * constructor. 146 */ 147 private static GuardedInvocation getSamTypeConverter(final Class<?> sourceType, final Class<?> targetType) throws Exception { 148 // If source type is more generic than ScriptFunction class, we'll need to use a guard 149 final boolean isSourceTypeGeneric = sourceType.isAssignableFrom(ScriptFunction.class); 150 174 final MethodHandle guard = isSourceTypeGeneric ? IS_NATIVE_ARRAY : null; 175 if(targetType.isArray()) { 176 return new GuardedInvocation(ARRAY_CONVERTERS.get(targetType), guard); 177 } 178 if(targetType == List.class) { 179 return new GuardedInvocation(JSType.TO_JAVA_LIST.methodHandle(), guard); 180 } 181 if(targetType == Deque.class) { 182 return new GuardedInvocation(JSType.TO_JAVA_DEQUE.methodHandle(), guard); 183 } 184 } 185 return null; 186 } 187 188 private static MethodHandle createArrayConverter(final Class<?> type) { 189 assert type.isArray(); 190 final MethodHandle converter = MH.insertArguments(JSType.TO_JAVA_ARRAY.methodHandle(), 1, type.getComponentType()); 191 return MH.asType(converter, converter.type().changeReturnType(type)); 192 } 193 194 private static GuardedInvocation getMirrorConverter(Class<?> sourceType, Class<?> targetType) { 195 // Could've also used (targetType.isAssignableFrom(ScriptObjectMirror.class) && targetType != Object.class) but 196 // it's probably better to explicitly spell out the supported target types 197 if (targetType == Map.class || targetType == Bindings.class || targetType == JSObject.class || targetType == ScriptObjectMirror.class) { 198 if(ScriptObject.class.isAssignableFrom(sourceType)) { 199 return new GuardedInvocation(CREATE_MIRROR, null); 200 } 201 return new GuardedInvocation(CREATE_MIRROR, IS_SCRIPT_OBJECT); 202 } 203 return null; 204 } 205 206 private static boolean isAutoConvertibleFromFunction(final Class<?> clazz) { 207 return isAbstractClass(clazz) && !ScriptObject.class.isAssignableFrom(clazz) && 208 JavaAdapterFactory.isAutoConvertibleFromFunction(clazz); 209 } 210 211 /** 212 * Utility method used by few other places in the code. Tests if the class has the abstract modifier and is not an 213 * array class. For some reason, array classes have the abstract modifier set in HotSpot JVM, and we don't want to 214 * treat array classes as abstract. 215 * @param clazz the inspected class 216 * @return true if the class is abstract and is not an array type. 217 */ 218 static boolean isAbstractClass(final Class<?> clazz) { 219 return Modifier.isAbstract(clazz.getModifiers()) && !clazz.isArray(); 220 } 221 222 223 @Override 224 public Comparison compareConversion(final Class<?> sourceType, final Class<?> targetType1, final Class<?> targetType2) { 225 if(sourceType == NativeArray.class) { 240 return Comparison.TYPE_2_BETTER; 241 } 242 } 243 if(ScriptObject.class.isAssignableFrom(sourceType)) { 244 // Prefer interfaces 245 if(targetType1.isInterface()) { 246 if(!targetType2.isInterface()) { 247 return Comparison.TYPE_1_BETTER; 248 } 249 } else if(targetType2.isInterface()) { 250 return Comparison.TYPE_2_BETTER; 251 } 252 } 253 return Comparison.INDETERMINATE; 254 } 255 256 private static boolean isList(Class<?> clazz) { 257 return clazz == List.class || clazz == Deque.class; 258 } 259 260 private static final MethodHandle IS_SCRIPT_OBJECT = Guards.isInstance(ScriptObject.class, MH.type(Boolean.TYPE, Object.class)); 261 private static final MethodHandle IS_SCRIPT_FUNCTION = Guards.isInstance(ScriptFunction.class, MH.type(Boolean.TYPE, Object.class)); 262 private static final MethodHandle IS_NATIVE_ARRAY = Guards.isOfClass(NativeArray.class, MH.type(Boolean.TYPE, Object.class)); 263 264 private static final MethodHandle IS_NASHORN_OR_UNDEFINED_TYPE = findOwnMH("isNashornTypeOrUndefined", Boolean.TYPE, Object.class); 265 private static final MethodHandle CREATE_MIRROR = findOwnMH("createMirror", Object.class, Object.class); 266 267 @SuppressWarnings("unused") 268 private static boolean isNashornTypeOrUndefined(final Object obj) { 269 return obj instanceof ScriptObject || obj instanceof Undefined; 270 } 271 272 @SuppressWarnings("unused") 273 private static Object createMirror(final Object obj) { 274 return ScriptObjectMirror.wrap(obj, Context.getGlobal()); 275 } 276 277 private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) { 278 return MH.findStatic(MethodHandles.lookup(), NashornLinker.class, name, MH.type(rtype, types)); 279 } 280 } 281 |