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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2014, 2019, 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
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* 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.
*
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package com.oracle.truffle.api.frame;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.nodes.Node;
/**
* Represents a current frame instance on the stack. Please note that any frame instance must not be
* used after the {@link TruffleRuntime#iterateFrames(FrameInstanceVisitor) iterateFrames()} method
* returned.
*
* @see TruffleRuntime#iterateFrames(FrameInstanceVisitor) To iterate the current frame instances on
* the stack.
* @since 0.8 or earlier
*/
public interface FrameInstance {
/**
* Access mode for {@link FrameInstance#getFrame(FrameAccess)}.
*
* @see FrameInstance#getFrame(FrameAccess)
* @since 0.8 or earlier
*/
enum FrameAccess {
/**
* This mode allows to read the frame and provides read only access to its local variables.
* The returned frame must not be stored/persisted. Writing local variables in this mode
* will result in an {@link AssertionError} only if assertions (-ea) are enabled.
*
* @since 0.8 or earlier
*/
READ_ONLY,
/**
* This mode allows to read the frame and provides read and write access to its local
* variables. The returned frame must not be stored/persisted.
*
* @since 0.8 or earlier
**/
READ_WRITE,
/**
* This mode allows to read a materialized version of the frame and provides read and write
* access to its local variables. In addition to {@link #READ_WRITE} this mode allows to
* store/persist the returned frame.
*
* @since 0.8 or earlier
**/
MATERIALIZE
}
/**
* Accesses the underlying frame using a specified {@link FrameAccess access mode}.
*
* @see FrameAccess
* @since 0.23
*/
Frame getFrame(FrameAccess access);
/** @since 0.8 or earlier */
boolean isVirtualFrame();
/**
* Returns an integer for the optimized tier of this method. If 0 is returned then
* this means that the frame is currently being interpreted without any optimization. The number
* of tiers is unlimited, but is typically restricted to a small set. e.g. 0-2. Where 0 could
* indicate interpreted, 1 indicates first tier and 2 indicates last tier compilation. It is
* best to not interpret this number and just print it for the user.
*
* @since 21.3.0
*/
default int getCompilationTier() {
return 0;
}
/**
* Returns whether or not the current frame is a compilation root. A compilation root is a
* compiled {@link CallTarget} which was itself compiled i.e. not inlined into another target.
*
* @since 21.3.0
*/
default boolean isCompilationRoot() {
return true;
}
/**
* Returns a node representing the callsite of the next new target on the stack.
*
* This picture indicates how {@link FrameInstance} groups the stack.
*
*
* ===============
* {@link TruffleRuntime#getCurrentFrame() Current}: ,>| CallTarget | FrameInstance
* | ===============
* {@link TruffleRuntime#getCallerFrame() Caller}: '-| CallNode | FrameInstance
* ,>| CallTarget |
* | ===============
* '-| CallNode | FrameInstance
* | CallTarget |
* ===============
* ...
* ===============
* | CallNode | FrameInstance
* Initial call: | CallTarget |
* ===============
*
*
*
* @return a node representing the callsite of the next new target on the stack. Null in case
* there is no upper target or if the target was not invoked using a
* {@link TruffleRuntime#createDirectCallNode(CallTarget) direct} or
* {@link TruffleRuntime#createIndirectCallNode() indirect} call node.
*
* @since 0.8 or earlier
**/
Node getCallNode();
/**
* The {@link CallTarget} being invoked in this frame.
*
* See {@link #getCallNode()} for the relation between call node and CallTarget.
*
* @since 0.8 or earlier
**/
CallTarget getCallTarget();
}