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.ResolvedJavaMethod; 26 27 /** 28 * Access to the object variables in a stack frame. 29 */ 30 public interface InspectedFrame { 31 32 /** 33 * Returns the value of the object local at {@code index}. This value is a copy iff 34 * {@link #isVirtual(int)} is true. 35 */ 36 Object getLocal(int index); 37 38 /** 39 * Returns whether the local at {@code index} is a virtual object, and therefore the object 40 * returned by {@link #getLocal(int)} is a copy. 41 */ 42 boolean isVirtual(int index); 43 44 /** 45 * Returns true if the stack frame is a compiled stack frame and there are virtual objects 46 * anywhere in the current state of the compiled method. This can return true even if 47 * {@link #isVirtual(int)} return false for all locals. 48 */ 49 boolean hasVirtualObjects(); 50 51 /** 52 * This method will materialize all virtual objects, deoptimize the stack frame and make sure 53 * that subsequent execution of the deoptimized frame uses the materialized values. 54 */ 55 void materializeVirtualObjects(boolean invalidateCode); 56 57 /** 58 * @return the current bytecode index 59 */ 60 int getBytecodeIndex(); 61 62 /** 63 * @return the current method 64 */ 65 ResolvedJavaMethod getMethod(); 66 67 /** 68 * Checks if the current method is equal to the given method. This is semantically equivalent to 69 * {@code method.equals(getMethod())}, but can be implemented more efficiently. 70 */ 71 boolean isMethod(ResolvedJavaMethod method); 72 }