Mercurial > hg > graal-jvmci-8
diff graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java @ 7267:a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 18 Dec 2012 15:33:55 +0100 |
parents | |
children | 5e3d1a68664e |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java Tue Dec 18 15:33:55 2012 +0100 @@ -0,0 +1,201 @@ +/* + * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.oracle.truffle.api.frame; + +import java.util.*; + +/** + * Descriptor of the slots of frame objects. Multiple frame instances are associated with one such descriptor. + */ +public final class FrameDescriptor { + + protected final TypeConversion typeConversion; + private final ArrayList<FrameSlotImpl> slots; + private FrameVersionImpl lastVersion; + private final HashMap<String, FrameSlotImpl> nameToSlotMap; + + public FrameDescriptor() { + this(DefaultTypeConversion.getInstance()); + } + + public FrameDescriptor(TypeConversion typeConversion) { + this.typeConversion = typeConversion; + slots = new ArrayList<>(); + nameToSlotMap = new HashMap<>(); + lastVersion = new FrameVersionImpl(); + } + + public FrameSlot addFrameSlot(String name) { + return addFrameSlot(name, typeConversion.getTopType()); + } + + public FrameSlot addFrameSlot(String name, Class<?> type) { + assert !nameToSlotMap.containsKey(name); + FrameSlotImpl slot = new FrameSlotImpl(this, name, slots.size(), type); + slots.add(slot); + nameToSlotMap.put(name, slot); + return slot; + } + + public FrameSlot findFrameSlot(String name) { + return nameToSlotMap.get(name); + } + + public FrameSlot findOrAddFrameSlot(String name) { + FrameSlot result = findFrameSlot(name); + if (result != null) { + return result; + } + return addFrameSlot(name); + } + + public FrameVersion getCurrentVersion() { + return lastVersion; + } + + public int getSize() { + return slots.size(); + } + + public List< ? extends FrameSlot> getSlots() { + return Collections.unmodifiableList(slots); + } + + protected void appendVersion(FrameVersionImpl newVersion) { + lastVersion.next = newVersion; + lastVersion = newVersion; + } +} + +class FrameVersionImpl implements FrameVersion { + + protected FrameVersionImpl next; + + @Override + public final FrameVersion getNext() { + return next; + } +} + +class TypeChangeFrameVersionImpl extends FrameVersionImpl implements FrameVersion.TypeChange { + + private final FrameSlotImpl slot; + private final Class< ? > oldType; + private final Class< ? > newType; + + protected TypeChangeFrameVersionImpl(FrameSlotImpl slot, Class< ? > oldType, Class< ? > newType) { + this.slot = slot; + this.oldType = oldType; + this.newType = newType; + } + + @Override + public final void applyTransformation(Frame frame) { + Object value = slot.getValue(oldType, frame); + slot.setValue(newType, frame, value); + } +} + +class FrameSlotImpl implements FrameSlot { + + private final FrameDescriptor descriptor; + private final String name; + private final int index; + private Class< ? > type; + private ArrayList<FrameSlotTypeListener> listeners; + + protected FrameSlotImpl(FrameDescriptor descriptor, String name, int index, Class< ? > type) { + this.descriptor = descriptor; + this.name = name; + this.index = index; + this.type = type; + assert type != null; + } + + public String getName() { + return name; + } + + public int getIndex() { + return index; + } + + public Class< ? > getType() { + return type; + } + + protected Object getValue(Class< ? > accessType, Frame frame) { + if (accessType == Integer.class) { + return frame.getInt(this); + } else if (accessType == Long.class) { + return frame.getLong(this); + } else if (accessType == Float.class) { + return frame.getFloat(this); + } else if (accessType == Double.class) { + return frame.getDouble(this); + } else { + return frame.getObject(this); + } + } + + protected void setValue(Class< ? > accessType, Frame frame, Object value) { + Object newValue = descriptor.typeConversion.convertTo(accessType, value); + if (accessType == Integer.class) { + frame.setInt(this, (Integer) newValue); + } else if (accessType == Long.class) { + frame.setLong(this, (Long) newValue); + } else if (accessType == Float.class) { + frame.setFloat(this, (Float) newValue); + } else if (accessType == Double.class) { + frame.setDouble(this, (Double) newValue); + } else { + frame.setObject(this, newValue); + } + } + + public void setType(final Class< ? > type) { + final Class< ? > oldType = this.type; + this.type = type; + ArrayList<FrameSlotTypeListener> oldListeners = this.listeners; + this.listeners = null; + if (oldListeners != null) { + for (FrameSlotTypeListener listener : oldListeners) { + listener.typeChanged(this, oldType); + } + } + descriptor.appendVersion(new TypeChangeFrameVersionImpl(this, oldType, type)); + } + + @Override + public String toString() { + return "[" + index + "," + name + "]"; + } + + @Override + public void registerOneShotTypeListener(FrameSlotTypeListener listener) { + if (listeners == null) { + listeners = new ArrayList<>(); + } + listeners.add(listener); + } +}