Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/Frame.java @ 9330:e162d9e32830
Added a clazz parameter to Frame.getArguments in order to allow unsafe access to the arguments object (i.e., avoiding the null check and the type cast).
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 26 Apr 2013 17:15:10 +0200 |
parents | 07f8d136a05e |
children | 0fccad3ce40d |
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/* * 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 com.oracle.truffle.api.*; /** * Represents a frame containing values of local variables of the guest language. Instances of this * type must not be stored in a field or cast to {@link java.lang.Object}. */ public interface Frame { /** * @return the object describing the layout of this frame */ FrameDescriptor getFrameDescriptor(); /** * Retrieves the arguments object from this frame. The runtime assumes that the arguments object * is never null. Additionally, the runtime may assume that the given parameter indicating the * class of the arguments object is correct. The runtime is not required to actually check the * type of the arguments object. The parameter must be a value that can be reduced to a compile * time constant. * * @param clazz the known type of the arguments object as a compile time constant * @return the arguments used when calling this method */ <T extends Arguments> T getArguments(Class<T> clazz); /** * Read access to a local variable of type {@link Object}. * * @param slot the slot of the local variable * @return the current value of the local variable */ Object getObject(FrameSlot slot) throws FrameSlotTypeException; /** * Write access to a local variable of type {@link Object}. * * @param slot the slot of the local variable * @param value the new value of the local variable */ void setObject(FrameSlot slot, Object value) throws FrameSlotTypeException; /** * Read access to a local variable of type boolean. * * @param slot the slot of the local variable * @return the current value of the local variable */ boolean getBoolean(FrameSlot slot) throws FrameSlotTypeException; /** * Write access to a local variable of type boolean. * * @param slot the slot of the local variable * @param value the new value of the local variable */ void setBoolean(FrameSlot slot, boolean value) throws FrameSlotTypeException; /** * Read access to a local variable of type int. * * @param slot the slot of the local variable * @return the current value of the local variable */ int getInt(FrameSlot slot) throws FrameSlotTypeException; /** * Write access to a local variable of type int. * * @param slot the slot of the local variable * @param value the new value of the local variable */ void setInt(FrameSlot slot, int value) throws FrameSlotTypeException; /** * Read access to a local variable of type long. * * @param slot the slot of the local variable * @return the current value of the local variable */ long getLong(FrameSlot slot) throws FrameSlotTypeException; /** * Write access to a local variable of type long. * * @param slot the slot of the local variable * @param value the new value of the local variable */ void setLong(FrameSlot slot, long value) throws FrameSlotTypeException; /** * Read access to a local variable of type float. * * @param slot the slot of the local variable * @return the current value of the local variable */ float getFloat(FrameSlot slot) throws FrameSlotTypeException; /** * Write access to a local variable of type float. * * @param slot the slot of the local variable * @param value the new value of the local variable */ void setFloat(FrameSlot slot, float value) throws FrameSlotTypeException; /** * Read access to a local variable of type double. * * @param slot the slot of the local variable * @return the current value of the local variable */ double getDouble(FrameSlot slot) throws FrameSlotTypeException; /** * Write access to a local variable of type double. * * @param slot the slot of the local variable * @param value the new value of the local variable */ void setDouble(FrameSlot slot, double value) throws FrameSlotTypeException; /** * Read access to a local variable of any type. * * @param slot the slot of the local variable * @return the current value of the local variable or defaultValue if unset */ Object getValue(FrameSlot slot); /** * Converts this virtual frame into a packed frame that has no longer direct access to the local * variables. This packing is an important hint to the Truffle optimizer and therefore passing * around a {@link PackedFrame} should be preferred over passing around a {@link VirtualFrame} * when the probability that an unpacking will occur is low. * * @return the packed frame */ PackedFrame pack(); /** * Materializes this frame, which allows it to be stored in a field or cast to * {@link java.lang.Object}. The frame however looses the ability to be packed or to access the * caller frame. * * @return the new materialized frame */ MaterializedFrame materialize(); }