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Truffle SL is an example language implemented using the Truffle API.
/*
* Copyright (c) 2012, 2020, 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
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* 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
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* SOFTWARE.
*/
package com.oracle.truffle.sl.nodes;
import java.util.ArrayList;
import java.util.List;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.InstrumentableNode;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.nodes.NodeUtil;
import com.oracle.truffle.api.nodes.NodeVisitor;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.SourceSection;
import com.oracle.truffle.sl.SLLanguage;
import com.oracle.truffle.sl.builtins.SLBuiltinNode;
import com.oracle.truffle.sl.nodes.controlflow.SLBlockNode;
import com.oracle.truffle.sl.nodes.controlflow.SLFunctionBodyNode;
import com.oracle.truffle.sl.nodes.local.SLReadArgumentNode;
import com.oracle.truffle.sl.nodes.local.SLWriteLocalVariableNode;
import com.oracle.truffle.sl.runtime.SLContext;
/**
* The root of all SL execution trees. It is a Truffle requirement that the tree root extends the
* class {@link RootNode}. This class is used for both builtin and user-defined functions. For
* builtin functions, the {@link #bodyNode} is a subclass of {@link SLBuiltinNode}. For user-defined
* functions, the {@link #bodyNode} is a {@link SLFunctionBodyNode}.
*/
@NodeInfo(language = "SL", description = "The root of all SL execution trees")
public class SLRootNode extends RootNode {
/** The function body that is executed, and specialized during execution. */
@Child private SLExpressionNode bodyNode;
/** The name of the function, for printing purposes only. */
private final String name;
private boolean isCloningAllowed;
private final SourceSection sourceSection;
@CompilerDirectives.CompilationFinal(dimensions = 1) private volatile SLWriteLocalVariableNode[] argumentNodesCache;
public SLRootNode(SLLanguage language, FrameDescriptor frameDescriptor, SLExpressionNode bodyNode, SourceSection sourceSection, String name) {
super(language, frameDescriptor);
this.bodyNode = bodyNode;
this.name = name;
this.sourceSection = sourceSection;
}
@Override
public SourceSection getSourceSection() {
return sourceSection;
}
@Override
public Object execute(VirtualFrame frame) {
assert SLContext.get(this) != null;
return bodyNode.executeGeneric(frame);
}
public SLExpressionNode getBodyNode() {
return bodyNode;
}
@Override
public String getName() {
return name;
}
public void setCloningAllowed(boolean isCloningAllowed) {
this.isCloningAllowed = isCloningAllowed;
}
@Override
public boolean isCloningAllowed() {
return isCloningAllowed;
}
@Override
public String toString() {
return "root " + name;
}
public final SLWriteLocalVariableNode[] getDeclaredArguments() {
SLWriteLocalVariableNode[] argumentNodes = argumentNodesCache;
if (argumentNodes == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
argumentNodesCache = argumentNodes = findArgumentNodes();
}
return argumentNodes;
}
private SLWriteLocalVariableNode[] findArgumentNodes() {
List writeArgNodes = new ArrayList<>(4);
NodeUtil.forEachChild(this.getBodyNode(), new NodeVisitor() {
private SLWriteLocalVariableNode wn; // The current write node containing a slot
@Override
public boolean visit(Node node) {
// When there is a write node, search for SLReadArgumentNode among its children:
if (node instanceof InstrumentableNode.WrapperNode) {
return NodeUtil.forEachChild(node, this);
}
if (node instanceof SLWriteLocalVariableNode) {
wn = (SLWriteLocalVariableNode) node;
boolean all = NodeUtil.forEachChild(node, this);
wn = null;
return all;
} else if (wn != null && (node instanceof SLReadArgumentNode)) {
writeArgNodes.add(wn);
return true;
} else if (wn == null && (node instanceof SLStatementNode && !(node instanceof SLBlockNode || node instanceof SLFunctionBodyNode))) {
// A different SL node - we're done.
return false;
} else {
return NodeUtil.forEachChild(node, this);
}
}
});
return writeArgNodes.toArray(new SLWriteLocalVariableNode[writeArgNodes.size()]);
}
}