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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2016, 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.api.debug;
import java.util.AbstractCollection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.nodes.LanguageInfo;
/**
* Translation of a map of object properties to a collection of debugger values. The implementation
* is not thread safe.
*/
final class ValuePropertiesCollection extends AbstractCollection {
static final InteropLibrary INTEROP = InteropLibrary.getFactory().getUncached();
private final DebuggerSession session;
private final LanguageInfo language;
private final Object object;
private final DebugScope scope;
private final Object keys;
private final String receiverName;
ValuePropertiesCollection(DebuggerSession session, LanguageInfo language, Object object, Object keys, String receiverName, DebugScope scope) {
this.session = session;
this.language = language;
this.object = object;
this.keys = keys;
this.scope = scope;
this.receiverName = receiverName;
}
@Override
public Iterator iterator() {
return new PropertiesIterator(receiverName);
}
@Override
public int size() {
try {
int size = (int) INTEROP.getArraySize(keys);
if (receiverName != null) { // Filter out the receiver
size--;
}
return size;
} catch (UnsupportedMessageException e) {
return 0;
}
}
DebugValue get(String name) {
if (name.equals(receiverName)) {
return null;
}
if (INTEROP.isMemberExisting(object, name)) {
return new DebugValue.ObjectMemberValue(session, language, scope, object, name);
}
return null;
}
private final class PropertiesIterator implements Iterator {
private final String ignoredName;
private long currentIndex = 0L;
private String nextMember;
PropertiesIterator(String ignoredName) {
this.ignoredName = ignoredName;
}
@Override
public boolean hasNext() {
if (ignoredName == null) {
return INTEROP.isArrayElementExisting(keys, currentIndex);
} else {
if (nextMember != null) {
return true;
}
while (INTEROP.isArrayElementExisting(keys, currentIndex)) {
nextMember = readNext();
if (!ignoredName.equals(nextMember)) {
return true;
}
}
return false;
}
}
private String readNext() {
try {
Object key = INTEROP.readArrayElement(keys, currentIndex);
String member = INTEROP.asString(key);
this.currentIndex++;
return member;
} catch (ThreadDeath td) {
throw td;
} catch (Throwable ex) {
throw DebugException.create(session, ex, language);
}
}
@Override
public DebugValue next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
String member;
if (nextMember != null) {
member = nextMember;
nextMember = null;
} else {
member = readNext();
}
return new DebugValue.ObjectMemberValue(session, language, scope, object, member);
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove not supported.");
}
}
}