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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2012, 2018, 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.impl;
import java.util.Arrays;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.FrameSlot;
import com.oracle.truffle.api.frame.FrameSlotKind;
import com.oracle.truffle.api.frame.FrameSlotTypeException;
import com.oracle.truffle.api.frame.MaterializedFrame;
import com.oracle.truffle.api.frame.VirtualFrame;
/**
* This is an implementation-specific class. Do not use or instantiate it. Instead, use
* {@link TruffleRuntime#createVirtualFrame(Object[], FrameDescriptor)} to create a
* {@link VirtualFrame}.
*/
final class DefaultVirtualFrame implements VirtualFrame {
private final FrameDescriptor descriptor;
private final Object[] arguments;
private Object[] locals;
private byte[] tags;
DefaultVirtualFrame(FrameDescriptor descriptor, Object[] arguments) {
this.descriptor = descriptor;
this.arguments = arguments;
// read size only once
final int size = descriptor.getSize();
this.locals = new Object[size];
Object defaultValue = descriptor.getDefaultValue();
if (defaultValue != null) {
Arrays.fill(locals, defaultValue);
}
this.tags = new byte[size];
}
@Override
public Object[] getArguments() {
return arguments;
}
@Override
public MaterializedFrame materialize() {
return new DefaultMaterializedFrame(this);
}
@Override
public Object getObject(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Object);
return locals[getFrameSlotIndex(slot)];
}
@Override
public void setObject(FrameSlot slot, Object value) {
verifySet(slot, FrameSlotKind.Object);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public byte getByte(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Byte);
return (byte) locals[getFrameSlotIndex(slot)];
}
@Override
public void setByte(FrameSlot slot, byte value) {
verifySet(slot, FrameSlotKind.Byte);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public boolean getBoolean(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Boolean);
return (boolean) locals[getFrameSlotIndex(slot)];
}
@Override
public void setBoolean(FrameSlot slot, boolean value) {
verifySet(slot, FrameSlotKind.Boolean);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public int getInt(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Int);
return (int) locals[getFrameSlotIndex(slot)];
}
@Override
public void setInt(FrameSlot slot, int value) {
verifySet(slot, FrameSlotKind.Int);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public long getLong(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Long);
return (long) locals[getFrameSlotIndex(slot)];
}
@Override
public void setLong(FrameSlot slot, long value) {
verifySet(slot, FrameSlotKind.Long);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public float getFloat(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Float);
return (float) locals[getFrameSlotIndex(slot)];
}
@Override
public void setFloat(FrameSlot slot, float value) {
verifySet(slot, FrameSlotKind.Float);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public double getDouble(FrameSlot slot) throws FrameSlotTypeException {
verifyGet(slot, FrameSlotKind.Double);
return (double) locals[getFrameSlotIndex(slot)];
}
@Override
public void setDouble(FrameSlot slot, double value) {
verifySet(slot, FrameSlotKind.Double);
locals[getFrameSlotIndex(slot)] = value;
}
@Override
public FrameDescriptor getFrameDescriptor() {
return this.descriptor;
}
@Override
public Object getValue(FrameSlot slot) {
int slotIndex = getSlotIndexChecked(slot);
return locals[slotIndex];
}
private int getSlotIndexChecked(FrameSlot slot) {
int slotIndex = getFrameSlotIndex(slot);
if (slotIndex >= tags.length) {
if (!resize()) {
throw new IllegalArgumentException(String.format("The frame slot '%s' is not known by the frame descriptor.", slot));
}
}
return slotIndex;
}
private void verifySet(FrameSlot slot, FrameSlotKind accessKind) {
int slotIndex = getSlotIndexChecked(slot);
tags[slotIndex] = (byte) accessKind.ordinal();
}
private void verifyGet(FrameSlot slot, FrameSlotKind accessKind) throws FrameSlotTypeException {
int slotIndex = getSlotIndexChecked(slot);
byte tag = tags[slotIndex];
if (accessKind == FrameSlotKind.Object ? tag != 0 : tag != accessKind.ordinal()) {
throw new FrameSlotTypeException();
}
}
private boolean resize() {
int oldSize = tags.length;
int newSize = descriptor.getSize();
if (newSize > oldSize) {
locals = Arrays.copyOf(locals, newSize);
Arrays.fill(locals, oldSize, newSize, descriptor.getDefaultValue());
tags = Arrays.copyOf(tags, newSize);
return true;
}
return false;
}
private byte getTag(FrameSlot slot) {
int slotIndex = getSlotIndexChecked(slot);
return tags[slotIndex];
}
@SuppressWarnings("deprecation")
private static int getFrameSlotIndex(FrameSlot slot) {
return slot.getIndex();
}
@Override
public boolean isObject(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Object.ordinal();
}
@Override
public boolean isByte(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Byte.ordinal();
}
@Override
public boolean isBoolean(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Boolean.ordinal();
}
@Override
public boolean isInt(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Int.ordinal();
}
@Override
public boolean isLong(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Long.ordinal();
}
@Override
public boolean isFloat(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Float.ordinal();
}
@Override
public boolean isDouble(FrameSlot slot) {
return getTag(slot) == FrameSlotKind.Double.ordinal();
}
}