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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 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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*/
package com.oracle.truffle.api.exception;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleStackTrace;
import com.oracle.truffle.api.TruffleStackTraceElement;
import com.oracle.truffle.api.impl.Accessor;
import com.oracle.truffle.api.interop.ExceptionType;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.InvalidArrayIndexException;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.SourceSection;
import java.util.Collections;
import java.util.List;
final class ExceptionAccessor extends Accessor {
private ExceptionAccessor() {
}
static final class ExceptionSupportImpl extends ExceptionSupport {
@Override
public Throwable getLazyStackTrace(Throwable exception) {
return ((AbstractTruffleException) exception).getLazyStackTrace();
}
@Override
public void setLazyStackTrace(Throwable exception, Throwable stackTrace) {
((AbstractTruffleException) exception).setLazyStackTrace(stackTrace);
}
@Override
public Object createDefaultStackTraceElementObject(RootNode rootNode, SourceSection sourceSection) {
return new DefaultStackTraceElementObject(rootNode, sourceSection);
}
@Override
public boolean isException(Object receiver) {
return receiver instanceof AbstractTruffleException;
}
@Override
public RuntimeException throwException(Object receiver) {
throw (AbstractTruffleException) receiver;
}
@Override
public Object getExceptionType(Object receiver) {
return ExceptionType.RUNTIME_ERROR;
}
@Override
public boolean isExceptionIncompleteSource(Object receiver) {
return false;
}
@Override
public int getExceptionExitStatus(Object receiver) {
throw throwUnsupportedMessageException();
}
@Override
public boolean hasExceptionCause(Object receiver) {
return isException(((AbstractTruffleException) receiver).getCause());
}
@Override
public Object getExceptionCause(Object receiver) {
Throwable throwable = ((AbstractTruffleException) receiver).getCause();
if (isException(throwable)) {
return throwable;
} else {
throw throwUnsupportedMessageException();
}
}
@Override
@TruffleBoundary
public boolean hasExceptionMessage(Object receiver) {
return ((AbstractTruffleException) receiver).getMessage() != null;
}
@Override
@TruffleBoundary
public Object getExceptionMessage(Object receiver) {
String message = ((AbstractTruffleException) receiver).getMessage();
if (message == null) {
throw throwUnsupportedMessageException();
} else {
return message;
}
}
@Override
public boolean hasExceptionStackTrace(Object receiver) {
return true;
}
@Override
@TruffleBoundary
public Object getExceptionStackTrace(Object receiver) {
List stack = TruffleStackTrace.getStackTrace((Throwable) receiver);
if (stack == null) {
stack = Collections.emptyList();
}
Object[] items = new Object[stack.size()];
for (int i = 0; i < items.length; i++) {
items[i] = stack.get(i).getGuestObject();
}
return new InteropList(items);
}
@Override
public boolean hasSourceLocation(Object receiver) {
Node location = ((AbstractTruffleException) receiver).getLocation();
return location != null && location.getEncapsulatingSourceSection() != null;
}
@Override
public SourceSection getSourceLocation(Object receiver) {
Node location = ((AbstractTruffleException) receiver).getLocation();
SourceSection sourceSection = location != null ? location.getEncapsulatingSourceSection() : null;
if (sourceSection == null) {
throw throwUnsupportedMessageException();
}
return sourceSection;
}
@Override
public int getStackTraceElementLimit(Object receiver) {
return ((AbstractTruffleException) receiver).getStackTraceElementLimit();
}
@Override
public Node getLocation(Object receiver) {
return ((AbstractTruffleException) receiver).getLocation();
}
@Override
public boolean assertGuestObject(Object guestObject) {
if (guestObject == null) {
throw new AssertionError("Guest object must be null.");
}
InteropLibrary interop = InteropLibrary.getUncached();
if (interop.hasExecutableName(guestObject)) {
Object executableName;
try {
executableName = interop.getExecutableName(guestObject);
} catch (UnsupportedMessageException um) {
throw new AssertionError("Failed to get the executable name.", um);
}
if (!interop.isString(executableName)) {
throw new AssertionError("Executable name must be an interop string.");
}
}
if (interop.hasDeclaringMetaObject(guestObject)) {
Object metaObject;
try {
metaObject = interop.getDeclaringMetaObject(guestObject);
} catch (UnsupportedMessageException um) {
throw new AssertionError("Failed to get the declaring meta object.", um);
}
if (!interop.isMetaObject(metaObject)) {
throw new AssertionError("Declaring meta object must be an interop meta object");
}
}
return true;
}
private static RuntimeException throwUnsupportedMessageException() {
throw silenceException(RuntimeException.class, UnsupportedMessageException.create());
}
@SuppressWarnings({"unchecked", "unused"})
private static E silenceException(Class type, Throwable ex) throws E {
throw (E) ex;
}
}
@ExportLibrary(InteropLibrary.class)
static final class InteropList implements TruffleObject {
private final Object[] items;
InteropList(Object[] items) {
this.items = items;
}
@ExportMessage
@SuppressWarnings("static-method")
boolean hasArrayElements() {
return true;
}
@ExportMessage
long getArraySize() {
return items.length;
}
@ExportMessage
boolean isArrayElementReadable(long index) {
return index >= 0 && index < items.length;
}
@ExportMessage
Object readArrayElement(long index) throws InvalidArrayIndexException {
if (index < 0 || index >= items.length) {
throw InvalidArrayIndexException.create(index);
}
return items[(int) index];
}
}
}