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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 
     23 #include <dlfcn.h>
     24 #include <limits.h>
     25 #include <unistd.h>
     26 
     27 /*
     28  * public void gc()
     29  *
     30  * Initiate a gc.
     31  */
     32 static void Dalvik_java_lang_Runtime_gc(const u4* args, JValue* pResult)
     33 {
     34     UNUSED_PARAMETER(args);
     35 
     36     dvmCollectGarbage();
     37     RETURN_VOID();
     38 }
     39 
     40 /*
     41  * private static void nativeExit(int code)
     42  *
     43  * Runtime.exit() calls this after doing shutdown processing.  Runtime.halt()
     44  * uses this as well.
     45  */
     46 static void Dalvik_java_lang_Runtime_nativeExit(const u4* args,
     47     JValue* pResult)
     48 {
     49     int status = args[0];
     50     if (gDvm.exitHook != NULL) {
     51         dvmChangeStatus(NULL, THREAD_NATIVE);
     52         (*gDvm.exitHook)(status);     // not expected to return
     53         dvmChangeStatus(NULL, THREAD_RUNNING);
     54         ALOGW("JNI exit hook returned");
     55     }
     56 #if defined(WITH_JIT) && defined(WITH_JIT_TUNING)
     57     dvmCompilerDumpStats();
     58 #endif
     59     ALOGD("Calling exit(%d)", status);
     60     exit(status);
     61 }
     62 
     63 /*
     64  * static String nativeLoad(String filename, ClassLoader loader, String ldLibraryPath)
     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     StringObject* ldLibraryPathObj = (StringObject*) args[2];
     76 
     77     assert(fileNameObj != NULL);
     78     char* fileName = dvmCreateCstrFromString(fileNameObj);
     79 
     80     if (ldLibraryPathObj != NULL) {
     81         char* ldLibraryPath = dvmCreateCstrFromString(ldLibraryPathObj);
     82         void* sym = dlsym(RTLD_DEFAULT, "android_update_LD_LIBRARY_PATH");
     83         if (sym != NULL) {
     84             typedef void (*Fn)(const char*);
     85             Fn android_update_LD_LIBRARY_PATH = reinterpret_cast<Fn>(sym);
     86             (*android_update_LD_LIBRARY_PATH)(ldLibraryPath);
     87         } else {
     88             ALOGE("android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!");
     89         }
     90         free(ldLibraryPath);
     91     }
     92 
     93     StringObject* result = NULL;
     94     char* reason = NULL;
     95     bool success = dvmLoadNativeCode(fileName, classLoader, &reason);
     96     if (!success) {
     97         const char* msg = (reason != NULL) ? reason : "unknown failure";
     98         result = dvmCreateStringFromCstr(msg);
     99         dvmReleaseTrackedAlloc((Object*) result, NULL);
    100     }
    101 
    102     free(reason);
    103     free(fileName);
    104     RETURN_PTR(result);
    105 }
    106 
    107 /*
    108  * public long maxMemory()
    109  *
    110  * Returns GC heap max memory in bytes.
    111  */
    112 static void Dalvik_java_lang_Runtime_maxMemory(const u4* args, JValue* pResult)
    113 {
    114     RETURN_LONG(dvmGetHeapDebugInfo(kVirtualHeapMaximumSize));
    115 }
    116 
    117 /*
    118  * public long totalMemory()
    119  *
    120  * Returns GC heap total memory in bytes.
    121  */
    122 static void Dalvik_java_lang_Runtime_totalMemory(const u4* args,
    123     JValue* pResult)
    124 {
    125     RETURN_LONG(dvmGetHeapDebugInfo(kVirtualHeapSize));
    126 }
    127 
    128 /*
    129  * public long freeMemory()
    130  *
    131  * Returns GC heap free memory in bytes.
    132  */
    133 static void Dalvik_java_lang_Runtime_freeMemory(const u4* args,
    134     JValue* pResult)
    135 {
    136     size_t size = dvmGetHeapDebugInfo(kVirtualHeapSize);
    137     size_t allocated = dvmGetHeapDebugInfo(kVirtualHeapAllocated);
    138     long long result = size - allocated;
    139     if (result < 0) {
    140         result = 0;
    141     }
    142     RETURN_LONG(result);
    143 }
    144 
    145 const DalvikNativeMethod dvm_java_lang_Runtime[] = {
    146     { "freeMemory",          "()J",
    147         Dalvik_java_lang_Runtime_freeMemory },
    148     { "gc",                 "()V",
    149         Dalvik_java_lang_Runtime_gc },
    150     { "maxMemory",          "()J",
    151         Dalvik_java_lang_Runtime_maxMemory },
    152     { "nativeExit",         "(I)V",
    153         Dalvik_java_lang_Runtime_nativeExit },
    154     { "nativeLoad",         "(Ljava/lang/String;Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/String;",
    155         Dalvik_java_lang_Runtime_nativeLoad },
    156     { "totalMemory",          "()J",
    157         Dalvik_java_lang_Runtime_totalMemory },
    158     { NULL, NULL, NULL },
    159 };
    160