1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 package jdk.vm.ci.code.stack;

    24 

    25 import jdk.vm.ci.meta.*;

    26 

    27 public interface InspectedFrame {

    28 

    29     /**

    30      * Returns the value of the local at the given index. Currently only works for object values.

    31      * This value is a copy iff {@link #isVirtual(int)} is true.

    32      */

    33     Object getLocal(int index);

    34 

    35     /**

    36      * Returns whether the local at the given index is a virtual object, and therefore the object

    37      * returned by {@link #getLocal(int)} is a copy.

    38      */

    39     boolean isVirtual(int index);

    40 

    41     /**

    42      * Returns true if the stack frame is a compiled stack frame and there are virtual objects

    43      * anywhere in the current state of the compiled method. This can return true even if

    44      * {@link #isVirtual(int)} return false for all locals.

    45      */

    46     boolean hasVirtualObjects();

    47 

    48     /**

    49      * This method will materialize all virtual objects, deoptimize the stack frame and make sure

    50      * that subsequent execution of the deoptimized frame uses the materialized values.

    51      */

    52     void materializeVirtualObjects(boolean invalidateCode);

    53 

    54     /**

    55      * @return the current bytecode index

    56      */

    57     int getBytecodeIndex();

    58 

    59     /**

    60      * @return the current method

    61      */

    62     ResolvedJavaMethod getMethod();

    63 

    64     /**

    65      * Checks if the current method is equal to the given method. This is semantically equivalent to

    66      * {@code method.equals(getMethod())}, but can be implemented more efficiently.

    67      */

    68     boolean isMethod(ResolvedJavaMethod method);

    69 }