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Truffle SL is an example language implemented using the Truffle API.
/*
* Copyright (c) 2014, 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
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.oracle.truffle.sl;
import static com.oracle.truffle.api.CompilerDirectives.shouldNotReachHere;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.exception.AbstractTruffleException;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.source.SourceSection;
import com.oracle.truffle.sl.runtime.SLLanguageView;
/**
* SL does not need a sophisticated error checking and reporting mechanism, so all unexpected
* conditions just abort execution. This exception class is used when we abort from within the SL
* implementation.
*/
public class SLException extends AbstractTruffleException {
private static final long serialVersionUID = -6799734410727348507L;
private static final InteropLibrary UNCACHED_LIB = InteropLibrary.getFactory().getUncached();
@TruffleBoundary
public SLException(String message, Node location) {
super(message, location);
}
/**
* Provides a user-readable message for run-time type errors. SL is strongly typed, i.e., there
* are no automatic type conversions of values.
*/
@TruffleBoundary
public static SLException typeError(Node operation, Object... values) {
StringBuilder result = new StringBuilder();
result.append("Type error");
if (operation != null) {
SourceSection ss = operation.getEncapsulatingSourceSection();
if (ss != null && ss.isAvailable()) {
result.append(" at ").append(ss.getSource().getName()).append(" line ").append(ss.getStartLine()).append(" col ").append(ss.getStartColumn());
}
}
result.append(": operation");
if (operation != null) {
NodeInfo nodeInfo = SLLanguage.lookupNodeInfo(operation.getClass());
if (nodeInfo != null) {
result.append(" \"").append(nodeInfo.shortName()).append("\"");
}
}
result.append(" not defined for");
String sep = " ";
for (int i = 0; i < values.length; i++) {
/*
* For primitive or foreign values we request a language view so the values are printed
* from the perspective of simple language and not another language. Since this is a
* rather rarely invoked exceptional method, we can just create the language view for
* primitive values and then conveniently request the meta-object and display strings.
* Using the language view for core builtins like the typeOf builtin might not be a good
* idea for performance reasons.
*/
Object value = SLLanguageView.forValue(values[i]);
result.append(sep);
sep = ", ";
if (value == null) {
result.append("ANY");
} else {
InteropLibrary valueLib = InteropLibrary.getFactory().getUncached(value);
if (valueLib.hasMetaObject(value) && !valueLib.isNull(value)) {
String qualifiedName;
try {
qualifiedName = UNCACHED_LIB.asString(UNCACHED_LIB.getMetaQualifiedName(valueLib.getMetaObject(value)));
} catch (UnsupportedMessageException e) {
throw shouldNotReachHere(e);
}
result.append(qualifiedName);
result.append(" ");
}
if (valueLib.isString(value)) {
result.append("\"");
}
result.append(valueLib.toDisplayString(value));
if (valueLib.isString(value)) {
result.append("\"");
}
}
}
return new SLException(result.toString(), operation);
}
}