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/*
***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2001 Chad Fowler
* Copyright (C) 2001 Alan Moore
* Copyright (C) 2001-2002 Benoit Cerrina
* Copyright (C) 2001-2004 Jan Arne Petersen
* Copyright (C) 2002-2004 Anders Bengtsson
* Copyright (C) 2004-2006 Thomas E Enebo
* Copyright (C) 2004-2005 Charles O Nutter
* Copyright (C) 2004 Stefan Matthias Aust
* Copyright (C) 2006 Ola Bini
* Copyright (C) 2006 Miguel Covarrubias
* Copyright (C) 2007 MenTaLguY
* Copyright (C) 2007 William N Dortch
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the CPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.javasupport.util.RuntimeHelpers;
import org.jruby.runtime.Block;
import org.jruby.runtime.ClassIndex;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import static org.jruby.runtime.Visibility.*;
import static org.jruby.CompatVersion.*;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.marshal.DataType;
import static org.jruby.javasupport.util.RuntimeHelpers.invokedynamic;
import static org.jruby.runtime.MethodIndex.EQL;
import static org.jruby.runtime.MethodIndex.OP_EQUAL;
import static org.jruby.runtime.MethodIndex.HASH;
/**
* RubyObject is the only implementation of the
* {@link org.jruby.runtime.builtin.IRubyObject}. Every Ruby object in JRuby
* is represented by something that is an instance of RubyObject. In
* some of the core class implementations, this means doing a subclass
* that extends RubyObject, in other cases it means using a simple
* RubyObject instance and the data field to store specific
* information about the Ruby object.
*
* Some care has been taken to make the implementation be as
* monomorphic as possible, so that the Java Hotspot engine can
* improve performance of it. That is the reason for several patterns
* that might seem odd in this class.
*
* The IRubyObject interface used to have lots of methods for
* different things, but these have now mostly been refactored into
* several interfaces that gives access to that specific part of the
* object. This gives us the possibility to switch out that subsystem
* without changing interfaces again. For example, instance variable
* and internal variables are handled this way, but the implementation
* in RubyObject only returns "this" in {@link #getInstanceVariables()} and
* {@link #getInternalVariables()}.
*
* @author jpetersen
*/
@JRubyClass(name="Object", include="Kernel")
public class RubyObject extends RubyBasicObject {
// Equivalent of T_DATA
public static class Data extends RubyObject implements DataType {
public Data(Ruby runtime, RubyClass metaClass, Object data) {
super(runtime, metaClass);
dataWrapStruct(data);
}
public Data(RubyClass metaClass, Object data) {
super(metaClass);
dataWrapStruct(data);
}
}
/**
* Standard path for object creation. Objects are entered into ObjectSpace
* only if ObjectSpace is enabled.
*/
public RubyObject(Ruby runtime, RubyClass metaClass) {
super(runtime, metaClass);
}
/**
* Path for objects that don't taint and don't enter objectspace.
*/
public RubyObject(RubyClass metaClass) {
super(metaClass);
}
/**
* Path for objects who want to decide whether they don't want to be in
* ObjectSpace even when it is on. (notably used by objects being
* considered immediate, they'll always pass false here)
*/
protected RubyObject(Ruby runtime, RubyClass metaClass, boolean useObjectSpace, boolean canBeTainted) {
super(runtime, metaClass, useObjectSpace, canBeTainted);
}
protected RubyObject(Ruby runtime, RubyClass metaClass, boolean useObjectSpace) {
super(runtime, metaClass, useObjectSpace);
}
/**
* Will create the Ruby class Object in the runtime
* specified. This method needs to take the actual class as an
* argument because of the Object class' central part in runtime
* initialization.
*/
public static RubyClass createObjectClass(Ruby runtime, RubyClass objectClass) {
objectClass.index = ClassIndex.OBJECT;
objectClass.setReifiedClass(RubyObject.class);
objectClass.defineAnnotatedMethods(RubyObject.class);
return objectClass;
}
/**
* Default allocator instance for all Ruby objects. The only
* reason to not use this allocator is if you actually need to
* have all instances of something be a subclass of RubyObject.
*
* @see org.jruby.runtime.ObjectAllocator
*/
public static final ObjectAllocator OBJECT_ALLOCATOR = new ObjectAllocator() {
public IRubyObject allocate(Ruby runtime, RubyClass klass) {
return new RubyObject(runtime, klass);
}
};
public static final ObjectAllocator REIFYING_OBJECT_ALLOCATOR = new ObjectAllocator() {
public IRubyObject allocate(Ruby runtime, RubyClass klass) {
klass.reifyWithAncestors();
return klass.allocate();
}
};
@Deprecated
public IRubyObject initialize() {
return getRuntime().getNil();
}
@JRubyMethod(visibility = PRIVATE, compat = RUBY1_8)
public IRubyObject initialize(ThreadContext context) {
return context.nil;
}
/**
* Will make sure that this object is added to the current object
* space.
*
* @see org.jruby.runtime.ObjectSpace
*/
public void attachToObjectSpace() {
getRuntime().getObjectSpace().add(this);
}
/**
* This is overridden in the other concrete Java builtins to provide a fast way
* to determine what type they are.
*
* Will generally return a value from org.jruby.runtime.ClassIndex
*
* @see org.jruby.runtime.ClassInde
*/
@Override
public int getNativeTypeIndex() {
return ClassIndex.OBJECT;
}
/**
* Simple helper to print any objects.
*/
public static void puts(Object obj) {
System.out.println(obj.toString());
}
/**
* This method is just a wrapper around the Ruby "==" method,
* provided so that RubyObjects can be used as keys in the Java
* HashMap object underlying RubyHash.
*/
@Override
public boolean equals(Object other) {
return other == this ||
other instanceof IRubyObject &&
invokedynamic(getRuntime().getCurrentContext(), this, OP_EQUAL, (IRubyObject) other).isTrue();
}
/**
* The default toString method is just a wrapper that calls the
* Ruby "to_s" method.
*/
@Override
public String toString() {
RubyString rubyString = RuntimeHelpers.invoke(getRuntime().getCurrentContext(), this, "to_s").convertToString();
return rubyString.getUnicodeValue();
}
/**
* Call the Ruby initialize method with the supplied arguments and block.
*/
public final void callInit(IRubyObject[] args, Block block) {
RuntimeHelpers.invoke(getRuntime().getCurrentContext(), this, "initialize", args, block);
}
/**
* Call the Ruby initialize method with the supplied arguments and block.
*/
public final void callInit(Block block) {
RuntimeHelpers.invoke(getRuntime().getCurrentContext(), this, "initialize", block);
}
/**
* Call the Ruby initialize method with the supplied arguments and block.
*/
public final void callInit(IRubyObject arg0, Block block) {
RuntimeHelpers.invoke(getRuntime().getCurrentContext(), this, "initialize", arg0, block);
}
/**
* Call the Ruby initialize method with the supplied arguments and block.
*/
public final void callInit(IRubyObject arg0, IRubyObject arg1, Block block) {
RuntimeHelpers.invoke(getRuntime().getCurrentContext(), this, "initialize", arg0, arg1, block);
}
/**
* Call the Ruby initialize method with the supplied arguments and block.
*/
public final void callInit(IRubyObject arg0, IRubyObject arg1, IRubyObject arg2, Block block) {
RuntimeHelpers.invoke(getRuntime().getCurrentContext(), this, "initialize", arg0, arg1, arg2, block);
}
/**
* Tries to convert this object to the specified Ruby type, using
* a specific conversion method.
*/
@Deprecated
public final IRubyObject convertToType(RubyClass target, int convertMethodIndex) {
throw new RuntimeException("Not supported; use the String versions");
}
/** specific_eval
*
* Evaluates the block or string inside of the context of this
* object, using the supplied arguments. If a block is given, this
* will be yielded in the specific context of this object. If no
* block is given then a String-like object needs to be the first
* argument, and this string will be evaluated. Second and third
* arguments in the args-array is optional, but can contain the
* filename and line of the string under evaluation.
*/
@Deprecated
public IRubyObject specificEval(ThreadContext context, RubyModule mod, IRubyObject[] args, Block block) {
if (block.isGiven()) {
if (args.length > 0) throw getRuntime().newArgumentError(args.length, 0);
return yieldUnder(context, mod, block);
}
if (args.length == 0) {
throw getRuntime().newArgumentError("block not supplied");
} else if (args.length > 3) {
String lastFuncName = context.getFrameName();
throw getRuntime().newArgumentError(
"wrong number of arguments: " + lastFuncName + "(src) or " + lastFuncName + "{..}");
}
// We just want the TypeError if the argument doesn't convert to a String (JRUBY-386)
RubyString evalStr;
if (args[0] instanceof RubyString) {
evalStr = (RubyString)args[0];
} else {
evalStr = args[0].convertToString();
}
String file;
int line;
if (args.length > 1) {
file = args[1].convertToString().asJavaString();
if (args.length > 2) {
line = (int)(args[2].convertToInteger().getLongValue() - 1);
} else {
line = 0;
}
} else {
file = "(eval)";
line = 0;
}
return evalUnder(context, mod, evalStr, file, line);
}
// Methods of the Object class (rb_obj_*):
/** rb_equal
*
* The Ruby "===" method is used by default in case/when
* statements. The Object implementation first checks Java identity
* equality and then calls the "==" method too.
*/
@Override
public IRubyObject op_eqq(ThreadContext context, IRubyObject other) {
return context.getRuntime().newBoolean(equalInternal(context, this, other));
}
/**
* Helper method for checking equality, first using Java identity
* equality, and then calling the "==" method.
*/
protected static boolean equalInternal(final ThreadContext context, final IRubyObject a, final IRubyObject b){
if (a == b) {
return true;
} else if (a instanceof RubySymbol) {
return false;
} else if (a instanceof RubyFixnum && b instanceof RubyFixnum) {
return ((RubyFixnum)a).fastEqual((RubyFixnum)b);
} else if (a instanceof RubyFloat && b instanceof RubyFloat) {
return ((RubyFloat)a).fastEqual((RubyFloat)b);
} else {
return invokedynamic(context, a, OP_EQUAL, b).isTrue();
}
}
/**
* Helper method for checking equality, first using Java identity
* equality, and then calling the "eql?" method.
*/
protected static boolean eqlInternal(final ThreadContext context, final IRubyObject a, final IRubyObject b){
if (a == b) {
return true;
} else if (a instanceof RubySymbol) {
return false;
} else if (a instanceof RubyNumeric) {
if (a.getClass() != b.getClass()) return false;
return equalInternal(context, a, b);
} else {
return invokedynamic(context, a, EQL, b).isTrue();
}
}
/**
* Override the Object#hashCode method to make sure that the Ruby
* hash is actually used as the hashcode for Ruby objects. If the
* Ruby "hash" method doesn't return a number, the Object#hashCode
* implementation will be used instead.
*/
@Override
public int hashCode() {
IRubyObject hashValue = invokedynamic(getRuntime().getCurrentContext(), this, HASH);
if (hashValue instanceof RubyFixnum) return (int) RubyNumeric.fix2long(hashValue);
return nonFixnumHashCode(hashValue);
}
private int nonFixnumHashCode(IRubyObject hashValue) {
Ruby runtime = getRuntime();
if (runtime.is1_9()) {
RubyInteger integer = hashValue.convertToInteger();
if (integer instanceof RubyBignum) {
return (int)integer.getBigIntegerValue().intValue();
} else {
return (int)integer.getLongValue();
}
} else {
hashValue = hashValue.callMethod(runtime.getCurrentContext(), "%", RubyFixnum.newFixnum(runtime, 536870923L));
if (hashValue instanceof RubyFixnum) return (int) RubyNumeric.fix2long(hashValue);
return System.identityHashCode(hashValue);
}
}
/** rb_inspect
*
* The internal helper that ensures a RubyString instance is returned
* so dangerous casting can be omitted
* Prefered over callMethod(context, "inspect")
*/
static RubyString inspect(ThreadContext context, IRubyObject object) {
return RubyString.objAsString(context, object.callMethod(context, "inspect"));
}
/**
* Tries to support Java serialization of Ruby objects. This is
* still experimental and might not work.
*/
// NOTE: Serialization is primarily supported for testing purposes, and there is no general
// guarantee that serialization will work correctly. Specifically, instance variables pointing
// at symbols, threads, modules, classes, and other unserializable types are not detected.
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
// write out ivar count followed by name/value pairs
List names = getInstanceVariableNameList();
out.writeInt(names.size());
for (String name : names) {
out.writeObject(name);
out.writeObject(getInstanceVariables().getInstanceVariable(name));
}
}
/**
* Tries to support Java unserialization of Ruby objects. This is
* still experimental and might not work.
*/
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
// rest in ivar count followed by name/value pairs
int ivarCount = in.readInt();
for (int i = 0; i < ivarCount; i++) {
setInstanceVariable((String)in.readObject(), (IRubyObject)in.readObject());
}
}
}
