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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2018, 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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* 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.polyglot;
import java.lang.reflect.Proxy;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.interop.InteropLibrary;
interface HostWrapper {
Object getGuestObject();
PolyglotContextImpl getContext();
PolyglotLanguageContext getLanguageContext();
static boolean isInstance(Object v) {
if (v == null) {
return false;
} else if (v instanceof Proxy) {
return isHostProxy(v);
} else {
return v instanceof HostWrapper;
}
}
@TruffleBoundary
static boolean isHostProxy(Object v) {
if (Proxy.isProxyClass(v.getClass())) {
return Proxy.getInvocationHandler(v) instanceof HostWrapper;
} else {
return false;
}
}
static HostWrapper asInstance(Object v) {
if (v instanceof Proxy) {
return getHostProxy(v);
} else {
return (HostWrapper) v;
}
}
@TruffleBoundary
static HostWrapper getHostProxy(Object v) {
return (HostWrapper) Proxy.getInvocationHandler(v);
}
@TruffleBoundary
static boolean equalsProxy(HostWrapper wrapper, Object other) {
if (other == null) {
return false;
} else if (Proxy.isProxyClass(other.getClass())) {
return equals(wrapper.getLanguageContext(), wrapper.getGuestObject(), getHostProxy(other).getGuestObject());
} else {
return false;
}
}
@TruffleBoundary
static boolean equals(PolyglotLanguageContext languageContext, Object receiver, Object obj) {
if (obj == null) {
return false;
} else if (receiver == obj) {
return true;
}
if (languageContext != null && (languageContext.context.closed || languageContext.context.invalid)) {
return false;
}
Object prev = null;
try {
prev = PolyglotValue.hostEnter(languageContext);
} catch (Throwable t) {
// enter might fail if context was closed asynchonously.
// Can no longer call interop.
return false;
}
try {
InteropLibrary receiverLib = InteropLibrary.getUncached(receiver);
InteropLibrary objLib = InteropLibrary.getUncached(obj);
return receiverLib.isIdentical(receiver, obj, objLib);
} catch (Throwable t) {
// propagate errors in languages they should be reported.
throw PolyglotImpl.guestToHostException(languageContext, t);
} finally {
try {
PolyglotValue.hostLeave(languageContext, prev);
} catch (Throwable t) {
// ignore errors leaving we cannot propagate them.
}
}
}
@TruffleBoundary
static int hashCode(PolyglotLanguageContext languageContext, Object receiver) {
if (languageContext != null && (languageContext.context.closed || languageContext.context.invalid)) {
return System.identityHashCode(receiver);
}
Object prev = null;
try {
prev = PolyglotValue.hostEnter(languageContext);
} catch (Throwable t) {
// enter might fail if context was closed.
// Can no longer call interop.
return System.identityHashCode(receiver);
}
try {
InteropLibrary receiverLib = InteropLibrary.getUncached(receiver);
if (receiverLib.hasIdentity(receiver)) {
return receiverLib.identityHashCode(receiver);
} else {
return System.identityHashCode(receiver);
}
} catch (Throwable t) {
// propagate errors in languages they should be reported.
throw PolyglotImpl.guestToHostException(languageContext, t);
} finally {
try {
PolyglotValue.hostLeave(languageContext, prev);
} catch (Throwable t) {
// ignore errors leaving we cannot propagate them.
}
}
}
static String toString(HostWrapper thisObj) {
PolyglotLanguageContext thisContext = thisObj.getLanguageContext();
Object thisGuestObject = thisObj.getGuestObject();
if (thisContext != null) {
try {
return thisContext.asValue(thisGuestObject).toString();
} catch (Exception e) {
}
}
return "Error in toString()";
}
}