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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 #include <dlfcn.h>
     18 #include <limits.h>
     19 #include <unistd.h>
     20 
     21 #include "gc/heap.h"
     22 #include "handle_scope-inl.h"
     23 #include "jni_internal.h"
     24 #include "mirror/class_loader.h"
     25 #include "runtime.h"
     26 #include "scoped_thread_state_change.h"
     27 #include "ScopedUtfChars.h"
     28 #include "verify_object-inl.h"
     29 
     30 namespace art {
     31 
     32 static void Runtime_gc(JNIEnv*, jclass) {
     33   if (Runtime::Current()->IsExplicitGcDisabled()) {
     34       LOG(INFO) << "Explicit GC skipped.";
     35       return;
     36   }
     37   Runtime::Current()->GetHeap()->CollectGarbage(false);
     38 }
     39 
     40 static void Runtime_nativeExit(JNIEnv*, jclass, jint status) {
     41   LOG(INFO) << "System.exit called, status: " << status;
     42   Runtime::Current()->CallExitHook(status);
     43   exit(status);
     44 }
     45 
     46 static jstring Runtime_nativeLoad(JNIEnv* env, jclass, jstring javaFilename, jobject javaLoader, jstring javaLdLibraryPath) {
     47   ScopedUtfChars filename(env, javaFilename);
     48   if (filename.c_str() == NULL) {
     49     return NULL;
     50   }
     51 
     52   if (javaLdLibraryPath != NULL) {
     53     ScopedUtfChars ldLibraryPath(env, javaLdLibraryPath);
     54     if (ldLibraryPath.c_str() == NULL) {
     55       return NULL;
     56     }
     57     void* sym = dlsym(RTLD_DEFAULT, "android_update_LD_LIBRARY_PATH");
     58     if (sym != NULL) {
     59       typedef void (*Fn)(const char*);
     60       Fn android_update_LD_LIBRARY_PATH = reinterpret_cast<Fn>(sym);
     61       (*android_update_LD_LIBRARY_PATH)(ldLibraryPath.c_str());
     62     } else {
     63       LOG(ERROR) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
     64     }
     65   }
     66 
     67   std::string detail;
     68   {
     69     ScopedObjectAccess soa(env);
     70     StackHandleScope<1> hs(soa.Self());
     71     Handle<mirror::ClassLoader> classLoader(
     72         hs.NewHandle(soa.Decode<mirror::ClassLoader*>(javaLoader)));
     73     JavaVMExt* vm = Runtime::Current()->GetJavaVM();
     74     bool success = vm->LoadNativeLibrary(filename.c_str(), classLoader, &detail);
     75     if (success) {
     76       return nullptr;
     77     }
     78   }
     79 
     80   // Don't let a pending exception from JNI_OnLoad cause a CheckJNI issue with NewStringUTF.
     81   env->ExceptionClear();
     82   return env->NewStringUTF(detail.c_str());
     83 }
     84 
     85 static jlong Runtime_maxMemory(JNIEnv*, jclass) {
     86   return Runtime::Current()->GetHeap()->GetMaxMemory();
     87 }
     88 
     89 static jlong Runtime_totalMemory(JNIEnv*, jclass) {
     90   return Runtime::Current()->GetHeap()->GetTotalMemory();
     91 }
     92 
     93 static jlong Runtime_freeMemory(JNIEnv*, jclass) {
     94   return Runtime::Current()->GetHeap()->GetFreeMemory();
     95 }
     96 
     97 static JNINativeMethod gMethods[] = {
     98   NATIVE_METHOD(Runtime, freeMemory, "!()J"),
     99   NATIVE_METHOD(Runtime, gc, "()V"),
    100   NATIVE_METHOD(Runtime, maxMemory, "!()J"),
    101   NATIVE_METHOD(Runtime, nativeExit, "(I)V"),
    102   NATIVE_METHOD(Runtime, nativeLoad, "(Ljava/lang/String;Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/String;"),
    103   NATIVE_METHOD(Runtime, totalMemory, "!()J"),
    104 };
    105 
    106 void register_java_lang_Runtime(JNIEnv* env) {
    107   REGISTER_NATIVE_METHODS("java/lang/Runtime");
    108 }
    109 
    110 }  // namespace art
    111