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      1 /*
      2  * Copyright (C) 2008 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 /*
     18  * java.lang.Runtime
     19  */
     20 #include "Dalvik.h"
     21 #include "native/InternalNativePriv.h"
     22 #include <unistd.h>
     23 #include <limits.h>
     24 
     25 /*
     26  * public void gc()
     27  *
     28  * Initiate a gc.
     29  */
     30 static void Dalvik_java_lang_Runtime_gc(const u4* args, JValue* pResult)
     31 {
     32     UNUSED_PARAMETER(args);
     33 
     34     dvmCollectGarbage();
     35     RETURN_VOID();
     36 }
     37 
     38 /*
     39  * private static void nativeExit(int code, boolean isExit)
     40  *
     41  * Runtime.exit() calls this after doing shutdown processing.  Runtime.halt()
     42  * uses this as well.
     43  */
     44 static void Dalvik_java_lang_Runtime_nativeExit(const u4* args,
     45     JValue* pResult)
     46 {
     47     int status = args[0];
     48     bool isExit = (args[1] != 0);
     49 
     50     if (isExit && gDvm.exitHook != NULL) {
     51         dvmChangeStatus(NULL, THREAD_NATIVE);
     52         (*gDvm.exitHook)(status);     // not expected to return
     53         dvmChangeStatus(NULL, THREAD_RUNNING);
     54         LOGW("JNI exit hook returned");
     55     }
     56     LOGD("Calling exit(%d)", status);
     57 #if defined(WITH_JIT) && defined(WITH_JIT_TUNING)
     58     dvmCompilerDumpStats();
     59 #endif
     60     exit(status);
     61 }
     62 
     63 /*
     64  * static String nativeLoad(String filename, ClassLoader loader)
     65  *
     66  * Load the specified full path as a dynamic library filled with
     67  * JNI-compatible methods. Returns null on success, or a failure
     68  * message on failure.
     69  */
     70 static void Dalvik_java_lang_Runtime_nativeLoad(const u4* args,
     71     JValue* pResult)
     72 {
     73     StringObject* fileNameObj = (StringObject*) args[0];
     74     Object* classLoader = (Object*) args[1];
     75     char* fileName = NULL;
     76     StringObject* result = NULL;
     77     char* reason = NULL;
     78     bool success;
     79 
     80     assert(fileNameObj != NULL);
     81     fileName = dvmCreateCstrFromString(fileNameObj);
     82 
     83     success = dvmLoadNativeCode(fileName, classLoader, &reason);
     84     if (!success) {
     85         const char* msg = (reason != NULL) ? reason : "unknown failure";
     86         result = dvmCreateStringFromCstr(msg);
     87         dvmReleaseTrackedAlloc((Object*) result, NULL);
     88     }
     89 
     90     free(reason);
     91     free(fileName);
     92     RETURN_PTR(result);
     93 }
     94 
     95 /*
     96  * public long maxMemory()
     97  *
     98  * Returns GC heap max memory in bytes.
     99  */
    100 static void Dalvik_java_lang_Runtime_maxMemory(const u4* args, JValue* pResult)
    101 {
    102     RETURN_LONG(dvmGetHeapDebugInfo(kVirtualHeapMaximumSize));
    103 }
    104 
    105 /*
    106  * public long totalMemory()
    107  *
    108  * Returns GC heap total memory in bytes.
    109  */
    110 static void Dalvik_java_lang_Runtime_totalMemory(const u4* args,
    111     JValue* pResult)
    112 {
    113     RETURN_LONG(dvmGetHeapDebugInfo(kVirtualHeapSize));
    114 }
    115 
    116 /*
    117  * public long freeMemory()
    118  *
    119  * Returns GC heap free memory in bytes.
    120  */
    121 static void Dalvik_java_lang_Runtime_freeMemory(const u4* args,
    122     JValue* pResult)
    123 {
    124     size_t size = dvmGetHeapDebugInfo(kVirtualHeapSize);
    125     size_t allocated = dvmGetHeapDebugInfo(kVirtualHeapAllocated);
    126     long long result = size - allocated;
    127     if (result < 0) {
    128         result = 0;
    129     }
    130     RETURN_LONG(result);
    131 }
    132 
    133 const DalvikNativeMethod dvm_java_lang_Runtime[] = {
    134     { "freeMemory",          "()J",
    135         Dalvik_java_lang_Runtime_freeMemory },
    136     { "gc",                 "()V",
    137         Dalvik_java_lang_Runtime_gc },
    138     { "maxMemory",          "()J",
    139         Dalvik_java_lang_Runtime_maxMemory },
    140     { "nativeExit",         "(IZ)V",
    141         Dalvik_java_lang_Runtime_nativeExit },
    142     { "nativeLoad",         "(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/String;",
    143         Dalvik_java_lang_Runtime_nativeLoad },
    144     { "totalMemory",          "()J",
    145         Dalvik_java_lang_Runtime_totalMemory },
    146     { NULL, NULL, NULL },
    147 };
    148