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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 "java_lang_Runtime.h"
     18 
     19 #include <dlfcn.h>
     20 #include <limits.h>
     21 #include <unistd.h>
     22 
     23 #include "base/macros.h"
     24 #include "gc/heap.h"
     25 #include "handle_scope-inl.h"
     26 #include "jni_internal.h"
     27 #include "mirror/class_loader.h"
     28 #include "runtime.h"
     29 #include "scoped_thread_state_change.h"
     30 #include "ScopedUtfChars.h"
     31 #include "verify_object-inl.h"
     32 
     33 #include <sstream>
     34 #ifdef HAVE_ANDROID_OS
     35 // This function is provided by android linker.
     36 extern "C" void android_update_LD_LIBRARY_PATH(const char* ld_library_path);
     37 #endif  // HAVE_ANDROID_OS
     38 
     39 namespace art {
     40 
     41 static void Runtime_gc(JNIEnv*, jclass) {
     42   if (Runtime::Current()->IsExplicitGcDisabled()) {
     43       LOG(INFO) << "Explicit GC skipped.";
     44       return;
     45   }
     46   Runtime::Current()->GetHeap()->CollectGarbage(false);
     47 }
     48 
     49 NO_RETURN static void Runtime_nativeExit(JNIEnv*, jclass, jint status) {
     50   LOG(INFO) << "System.exit called, status: " << status;
     51   Runtime::Current()->CallExitHook(status);
     52   exit(status);
     53 }
     54 
     55 static void SetLdLibraryPath(JNIEnv* env, jstring javaLdLibraryPathJstr) {
     56 #ifdef HAVE_ANDROID_OS
     57   if (javaLdLibraryPathJstr != nullptr) {
     58     ScopedUtfChars ldLibraryPath(env, javaLdLibraryPathJstr);
     59     if (ldLibraryPath.c_str() != nullptr) {
     60       android_update_LD_LIBRARY_PATH(ldLibraryPath.c_str());
     61     }
     62   }
     63 
     64 #else
     65   LOG(WARNING) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
     66   UNUSED(javaLdLibraryPathJstr, env);
     67 #endif
     68 }
     69 
     70 static jstring Runtime_nativeLoad(JNIEnv* env, jclass, jstring javaFilename, jobject javaLoader,
     71                                   jstring javaLdLibraryPathJstr) {
     72   ScopedUtfChars filename(env, javaFilename);
     73   if (filename.c_str() == nullptr) {
     74     return nullptr;
     75   }
     76 
     77   SetLdLibraryPath(env, javaLdLibraryPathJstr);
     78 
     79   std::string error_msg;
     80   {
     81     JavaVMExt* vm = Runtime::Current()->GetJavaVM();
     82     bool success = vm->LoadNativeLibrary(env, filename.c_str(), javaLoader, &error_msg);
     83     if (success) {
     84       return nullptr;
     85     }
     86   }
     87 
     88   // Don't let a pending exception from JNI_OnLoad cause a CheckJNI issue with NewStringUTF.
     89   env->ExceptionClear();
     90   return env->NewStringUTF(error_msg.c_str());
     91 }
     92 
     93 static jlong Runtime_maxMemory(JNIEnv*, jclass) {
     94   return Runtime::Current()->GetHeap()->GetMaxMemory();
     95 }
     96 
     97 static jlong Runtime_totalMemory(JNIEnv*, jclass) {
     98   return Runtime::Current()->GetHeap()->GetTotalMemory();
     99 }
    100 
    101 static jlong Runtime_freeMemory(JNIEnv*, jclass) {
    102   return Runtime::Current()->GetHeap()->GetFreeMemory();
    103 }
    104 
    105 static JNINativeMethod gMethods[] = {
    106   NATIVE_METHOD(Runtime, freeMemory, "!()J"),
    107   NATIVE_METHOD(Runtime, gc, "()V"),
    108   NATIVE_METHOD(Runtime, maxMemory, "!()J"),
    109   NATIVE_METHOD(Runtime, nativeExit, "(I)V"),
    110   NATIVE_METHOD(Runtime, nativeLoad, "(Ljava/lang/String;Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/String;"),
    111   NATIVE_METHOD(Runtime, totalMemory, "!()J"),
    112 };
    113 
    114 void register_java_lang_Runtime(JNIEnv* env) {
    115   REGISTER_NATIVE_METHODS("java/lang/Runtime");
    116 }
    117 
    118 }  // namespace art
    119