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Truffle SL is an example language implemented using the Truffle API.
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/*
* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
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* This license is subject to the following condition:
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* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
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package com.oracle.truffle.sl.nodes.access;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeChildren;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.interop.UnsupportedTypeException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.runtime.SLContext;
import com.oracle.truffle.sl.runtime.SLUndefinedNameException;
/**
* The node for writing a property of an object. When executed, this node:
*
* - evaluates the object expression on the left hand side of the object access operator
* - evaluates the property name
* - evaluates the value expression on the right hand side of the assignment operator
* - writes the named property
* - returns the written value
*
*/
@NodeInfo(shortName = ".=")
@NodeChildren({@NodeChild("receiverNode"), @NodeChild("nameNode"), @NodeChild("valueNode")})
@ImportStatic({SLContext.class, Message.class})
public abstract class SLWritePropertyNode extends SLExpressionNode {
@Specialization(guards = "isSLObject(receiver)")
protected Object write(DynamicObject receiver, Object name, Object value,
@Cached("create()") SLWritePropertyCacheNode writeNode) {
/**
* The polymorphic cache node that performs the actual write. This is a separate node so
* that it can be re-used in cases where the receiver, name, and value are not nodes but
* already evaluated values.
*/
writeNode.executeWrite(receiver, name, value);
return value;
}
/**
* Language interoperability: If the receiver object is a foreign value we use Truffle's interop
* API to access the foreign data.
*/
@Specialization(guards = "!isSLObject(receiver)")
protected void writeForeign(TruffleObject receiver, Object name, Object value,
// The child node to access the foreign object
@Cached("WRITE.createNode()") Node foreignWriteNode) {
try {
/* Perform the foreign object access. */
ForeignAccess.sendWrite(foreignWriteNode, receiver, name, value);
} catch (UnknownIdentifierException | UnsupportedTypeException | UnsupportedMessageException e) {
/* Foreign access was not successful. */
throw SLUndefinedNameException.undefinedProperty(this, name);
}
}
/**
* When no specialization fits, the receiver is not an object (which is a type error).
*/
@Fallback
@SuppressWarnings("unused")
protected void updateShape(Object r, Object name, Object value) {
throw SLUndefinedNameException.undefinedProperty(this, name);
}
}
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