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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package org.apache.harmony.dalvik.ddmc;
     18 
     19 import dalvik.annotation.optimization.FastNative;
     20 
     21 /**
     22  * Declarations for some VM-internal DDM stuff.
     23  */
     24 public class DdmVmInternal {
     25 
     26     /* do not instantiate */
     27     private DdmVmInternal() {}
     28 
     29     /**
     30      * Enable thread notification.
     31      *
     32      * This is built into the VM, since that's where threads get managed.
     33      */
     34     native public static void threadNotify(boolean enable);
     35 
     36     /**
     37      * Enable heap info updates.
     38      *
     39      * This is built into the VM, since that's where the heap is managed.
     40      *
     41      * @param when when to send the next HPIF chunk
     42      * @return true on success.  false if 'when' is bad or if there was
     43      *         an internal error.
     44      */
     45     @FastNative
     46     native public static boolean heapInfoNotify(int when);
     47 
     48     /**
     49      * Enable heap segment updates for the java (isNative == false) or
     50      * native (isNative == true) heap.
     51      *
     52      * This is built into the VM, since that's where the heap is managed.
     53      */
     54     native public static boolean heapSegmentNotify(int when, int what,
     55         boolean isNative);
     56 
     57     /**
     58      * Get status info for all threads.  This is for the THST chunk.
     59      *
     60      * Returns a byte array with the THST data, or null if something
     61      * went wrong.
     62      */
     63     native public static byte[] getThreadStats();
     64 
     65     /**
     66      * Get a stack trace for the specified thread ID.  The ID can be found
     67      * in the data from getThreadStats.
     68      */
     69     native public static StackTraceElement[] getStackTraceById(int threadId);
     70 
     71     /**
     72      * Enable or disable "recent allocation" tracking.
     73      */
     74     native public static void enableRecentAllocations(boolean enable);
     75 
     76     /*
     77      * Return a boolean indicating whether or not the "recent allocation"
     78      * feature is currently enabled.
     79      */
     80     @FastNative
     81     native public static boolean getRecentAllocationStatus();
     82 
     83     /**
     84      * Fill a buffer with data on recent heap allocations.
     85      */
     86     @FastNative
     87     native public static byte[] getRecentAllocations();
     88 }
     89 
     90