test/115-native-bridge/nativebridge.cc - platform/art - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 // A simple implementation of the native-bridge interface.

 #include <algorithm>
 #include <dlfcn.h>
 #include <vector>

 #include "jni.h"
 #include "stdio.h"
 #include "unistd.h"

 #include "nativebridge/native_bridge.h"

 struct NativeBridgeMethod {
   const char* name;
   const char* signature;
   bool static_method;
   void* fnPtr;
   void* trampoline;
 };

 static NativeBridgeMethod* find_native_bridge_method(const char *name);
 static const android::NativeBridgeRuntimeCallbacks* gNativeBridgeArtCallbacks;

 static jint trampoline_JNI_OnLoad(JavaVM* vm, void* reserved) {
   JNIEnv* env = nullptr;
   typedef jint (*FnPtr_t)(JavaVM*, void*);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("JNI_OnLoad")->fnPtr);

   vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
   if (env == nullptr) {
     return 0;
   }

   jclass klass = env->FindClass("Main");
   if (klass != nullptr) {
     int i, count1, count2;
     count1 = gNativeBridgeArtCallbacks->getNativeMethodCount(env, klass);
     std::unique_ptr<JNINativeMethod[]> methods(new JNINativeMethod[count1]);
     if (methods == nullptr) {
       return 0;
     }
     count2 = gNativeBridgeArtCallbacks->getNativeMethods(env, klass, methods.get(), count1);
     if (count1 == count2) {
       printf("Test ART callbacks: all JNI function number is %d.\n", count1);
     }

     for (i = 0; i < count1; i++) {
       NativeBridgeMethod* nb_method = find_native_bridge_method(methods[i].name);
       if (nb_method != nullptr) {
         jmethodID mid = nullptr;
         if (nb_method->static_method) {
           mid = env->GetStaticMethodID(klass, methods[i].name, nb_method->signature);
         } else {
           mid = env->GetMethodID(klass, methods[i].name, nb_method->signature);
         }
         if (mid != nullptr) {
           const char* shorty = gNativeBridgeArtCallbacks->getMethodShorty(env, mid);
           if (strcmp(shorty, methods[i].signature) == 0) {
             printf("    name:%s, signature:%s, shorty:%s.\n",
                    methods[i].name, nb_method->signature, shorty);
           }
         }
       }
     }
     methods.release();
   }

   printf("%s called!\n", __FUNCTION__);
   return fnPtr(vm, reserved);
 }

 static void trampoline_Java_Main_testFindClassOnAttachedNativeThread(JNIEnv* env,
                                                                      jclass klass) {
   typedef void (*FnPtr_t)(JNIEnv*, jclass);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
     (find_native_bridge_method("testFindClassOnAttachedNativeThread")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass);
 }

 static void trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative(JNIEnv* env,
                                                                            jclass klass) {
   typedef void (*FnPtr_t)(JNIEnv*, jclass);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
     (find_native_bridge_method("testFindFieldOnAttachedNativeThreadNative")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass);
 }

 static void trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative(JNIEnv* env,
                                                                           jclass klass) {
   typedef void (*FnPtr_t)(JNIEnv*, jclass);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
     (find_native_bridge_method("testCallStaticVoidMethodOnSubClassNative")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass);
 }

 static jobject trampoline_Java_Main_testGetMirandaMethodNative(JNIEnv* env, jclass klass) {
   typedef jobject (*FnPtr_t)(JNIEnv*, jclass);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
     (find_native_bridge_method("testGetMirandaMethodNative")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass);
 }

 static void trampoline_Java_Main_testZeroLengthByteBuffers(JNIEnv* env, jclass klass) {
   typedef void (*FnPtr_t)(JNIEnv*, jclass);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
     (find_native_bridge_method("testZeroLengthByteBuffers")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass);
 }

 static jbyte trampoline_Java_Main_byteMethod(JNIEnv* env, jclass klass, jbyte b1, jbyte b2,
                                              jbyte b3, jbyte b4, jbyte b5, jbyte b6,
                                              jbyte b7, jbyte b8, jbyte b9, jbyte b10) {
   typedef jbyte (*FnPtr_t)(JNIEnv*, jclass, jbyte, jbyte, jbyte, jbyte, jbyte,
                            jbyte, jbyte, jbyte, jbyte, jbyte);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("byteMethod")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
 }

 static jshort trampoline_Java_Main_shortMethod(JNIEnv* env, jclass klass, jshort s1, jshort s2,
                                                jshort s3, jshort s4, jshort s5, jshort s6,
                                                jshort s7, jshort s8, jshort s9, jshort s10) {
   typedef jshort (*FnPtr_t)(JNIEnv*, jclass, jshort, jshort, jshort, jshort, jshort,
                             jshort, jshort, jshort, jshort, jshort);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("shortMethod")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10);
 }

 static jboolean trampoline_Java_Main_booleanMethod(JNIEnv* env, jclass klass, jboolean b1,
                                                    jboolean b2, jboolean b3, jboolean b4,
                                                    jboolean b5, jboolean b6, jboolean b7,
                                                    jboolean b8, jboolean b9, jboolean b10) {
   typedef jboolean (*FnPtr_t)(JNIEnv*, jclass, jboolean, jboolean, jboolean, jboolean, jboolean,
                               jboolean, jboolean, jboolean, jboolean, jboolean);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("booleanMethod")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
 }

 static jchar trampoline_Java_Main_charMethod(JNIEnv* env, jclass klass, jchar c1, jchar c2,
                                              jchar c3, jchar c4, jchar c5, jchar c6,
                                              jchar c7, jchar c8, jchar c9, jchar c10) {
   typedef jchar (*FnPtr_t)(JNIEnv*, jclass, jchar, jchar, jchar, jchar, jchar,
                            jchar, jchar, jchar, jchar, jchar);
   FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("charMethod")->fnPtr);
   printf("%s called!\n", __FUNCTION__);
   return fnPtr(env, klass, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10);
 }

 NativeBridgeMethod gNativeBridgeMethods[] = {
   { "JNI_OnLoad", "", true, nullptr,
     reinterpret_cast<void*>(trampoline_JNI_OnLoad) },
   { "booleanMethod", "(ZZZZZZZZZZ)Z", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_booleanMethod) },
   { "byteMethod", "(BBBBBBBBBB)B", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_byteMethod) },
   { "charMethod", "(CCCCCCCCCC)C", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_charMethod) },
   { "shortMethod", "(SSSSSSSSSS)S", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_shortMethod) },
   { "testCallStaticVoidMethodOnSubClassNative", "()V", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative) },
   { "testFindClassOnAttachedNativeThread", "()V", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_testFindClassOnAttachedNativeThread) },
   { "testFindFieldOnAttachedNativeThreadNative", "()V", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative) },
   { "testGetMirandaMethodNative", "()Ljava/lang/reflect/Method;", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_testGetMirandaMethodNative) },
   { "testZeroLengthByteBuffers", "()V", true, nullptr,
     reinterpret_cast<void*>(trampoline_Java_Main_testZeroLengthByteBuffers) },
 };

 static NativeBridgeMethod* find_native_bridge_method(const char *name) {
   const char* pname = name;
   if (strncmp(name, "Java_Main_", 10) == 0) {
     pname += 10;
   }

   for (size_t i = 0; i < sizeof(gNativeBridgeMethods) / sizeof(gNativeBridgeMethods[0]); i++) {
     if (strcmp(pname, gNativeBridgeMethods[i].name) == 0) {
       return &gNativeBridgeMethods[i];
     }
   }
   return nullptr;
 }

 // NativeBridgeCallbacks implementations
 extern "C" bool native_bridge_initialize(const android::NativeBridgeRuntimeCallbacks* art_cbs,
                                          const char* private_dir, const char* isa) {
   if (art_cbs != nullptr) {
     gNativeBridgeArtCallbacks = art_cbs;
     printf("Native bridge initialized.\n");
   }
   return true;
 }

 extern "C" void* native_bridge_loadLibrary(const char* libpath, int flag) {
   size_t len = strlen(libpath);
   char* tmp = new char[len + 10];
   strncpy(tmp, libpath, len);
   tmp[len - 3] = '2';
   tmp[len - 2] = '.';
   tmp[len - 1] = 's';
   tmp[len] = 'o';
   tmp[len + 1] = 0;
   void* handle = dlopen(tmp, flag);
   delete[] tmp;

   if (handle == nullptr) {
     printf("Handle = nullptr!\n");
     printf("Was looking for %s.\n", libpath);
     printf("Error = %s.\n", dlerror());
     char cwd[1024];
     if (getcwd(cwd, sizeof(cwd)) != nullptr) {
       printf("Current working dir: %s\n", cwd);
     }
   }
   return handle;
 }

 extern "C" void* native_bridge_getTrampoline(void* handle, const char* name, const char* shorty,
                                              uint32_t len) {
   printf("Getting trampoline for %s with shorty %s.\n", name, shorty);

   // The name here is actually the JNI name, so we can directly do the lookup.
   void* sym = dlsym(handle, name);
   NativeBridgeMethod* method = find_native_bridge_method(name);
   if (method == nullptr)
     return nullptr;
   method->fnPtr = sym;

   return method->trampoline;
 }

 extern "C" bool native_bridge_isSupported(const char* libpath) {
   printf("Checking for support.\n");

   if (libpath == nullptr) {
     return false;
   }
   // We don't want to hijack javacore. So we should get libarttest...
   return strcmp(libpath, "libjavacore.so") != 0;
 }

 namespace android {

 // Environment values required by the apps running with native bridge.
 struct NativeBridgeRuntimeValues {
   const char* os_arch;
   const char* cpu_abi;
   const char* cpu_abi2;
   const char* *supported_abis;
   int32_t abi_count;
 };

 }  // namespace android

 const char* supported_abis[] = {
     "supported1", "supported2", "supported3"
 };

 const struct android::NativeBridgeRuntimeValues nb_env {
     .os_arch = "os.arch",
     .cpu_abi = "cpu_abi",
     .cpu_abi2 = "cpu_abi2",
     .supported_abis = supported_abis,
     .abi_count = 3
 };

 extern "C" const struct android::NativeBridgeRuntimeValues* native_bridge_getAppEnv(
     const char* abi) {
   printf("Checking for getEnvValues.\n");

   if (abi == nullptr) {
     return nullptr;
   }

   return &nb_env;
 }

 // "NativeBridgeItf" is effectively an API (it is the name of the symbol that will be loaded
 // by the native bridge library).
 android::NativeBridgeCallbacks NativeBridgeItf {
   .version = 1,
   .initialize = &native_bridge_initialize,
   .loadLibrary = &native_bridge_loadLibrary,
   .getTrampoline = &native_bridge_getTrampoline,
   .isSupported = &native_bridge_isSupported,
   .getAppEnv = &native_bridge_getAppEnv
 };
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	// A simple implementation of the native-bridge interface.

	#include <algorithm>
	#include <dlfcn.h>
	#include <vector>

	#include "jni.h"
	#include "stdio.h"
	#include "unistd.h"

	#include "nativebridge/native_bridge.h"

	struct NativeBridgeMethod {
	const char* name;
	const char* signature;
	bool static_method;
	void* fnPtr;
	void* trampoline;
	};

	static NativeBridgeMethod* find_native_bridge_method(const char *name);
	static const android::NativeBridgeRuntimeCallbacks* gNativeBridgeArtCallbacks;

	static jint trampoline_JNI_OnLoad(JavaVM* vm, void* reserved) {
	JNIEnv* env = nullptr;
	typedef jint (FnPtr_t)(JavaVM, void*);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("JNI_OnLoad")->fnPtr);

	vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
	if (env == nullptr) {
	return 0;
	}

	jclass klass = env->FindClass("Main");
	if (klass != nullptr) {
	int i, count1, count2;
	count1 = gNativeBridgeArtCallbacks->getNativeMethodCount(env, klass);
	std::unique_ptr<JNINativeMethod[]> methods(new JNINativeMethod[count1]);
	if (methods == nullptr) {
	return 0;
	}
	count2 = gNativeBridgeArtCallbacks->getNativeMethods(env, klass, methods.get(), count1);
	if (count1 == count2) {
	printf("Test ART callbacks: all JNI function number is %d.\n", count1);
	}

	for (i = 0; i < count1; i++) {
	NativeBridgeMethod* nb_method = find_native_bridge_method(methods[i].name);
	if (nb_method != nullptr) {
	jmethodID mid = nullptr;
	if (nb_method->static_method) {
	mid = env->GetStaticMethodID(klass, methods[i].name, nb_method->signature);
	} else {
	mid = env->GetMethodID(klass, methods[i].name, nb_method->signature);
	}
	if (mid != nullptr) {
	const char* shorty = gNativeBridgeArtCallbacks->getMethodShorty(env, mid);
	if (strcmp(shorty, methods[i].signature) == 0) {
	printf(" name:%s, signature:%s, shorty:%s.\n",
	methods[i].name, nb_method->signature, shorty);
	}
	}
	}
	}
	methods.release();
	}

	printf("%s called!\n", __FUNCTION__);
	return fnPtr(vm, reserved);
	}

	static void trampoline_Java_Main_testFindClassOnAttachedNativeThread(JNIEnv* env,
	jclass klass) {
	typedef void (FnPtr_t)(JNIEnv, jclass);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
	(find_native_bridge_method("testFindClassOnAttachedNativeThread")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass);
	}

	static void trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative(JNIEnv* env,
	jclass klass) {
	typedef void (FnPtr_t)(JNIEnv, jclass);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
	(find_native_bridge_method("testFindFieldOnAttachedNativeThreadNative")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass);
	}

	static void trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative(JNIEnv* env,
	jclass klass) {
	typedef void (FnPtr_t)(JNIEnv, jclass);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
	(find_native_bridge_method("testCallStaticVoidMethodOnSubClassNative")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass);
	}

	static jobject trampoline_Java_Main_testGetMirandaMethodNative(JNIEnv* env, jclass klass) {
	typedef jobject (FnPtr_t)(JNIEnv, jclass);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
	(find_native_bridge_method("testGetMirandaMethodNative")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass);
	}

	static void trampoline_Java_Main_testZeroLengthByteBuffers(JNIEnv* env, jclass klass) {
	typedef void (FnPtr_t)(JNIEnv, jclass);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
	(find_native_bridge_method("testZeroLengthByteBuffers")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass);
	}

	static jbyte trampoline_Java_Main_byteMethod(JNIEnv* env, jclass klass, jbyte b1, jbyte b2,
	jbyte b3, jbyte b4, jbyte b5, jbyte b6,
	jbyte b7, jbyte b8, jbyte b9, jbyte b10) {
	typedef jbyte (FnPtr_t)(JNIEnv, jclass, jbyte, jbyte, jbyte, jbyte, jbyte,
	jbyte, jbyte, jbyte, jbyte, jbyte);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("byteMethod")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
	}

	static jshort trampoline_Java_Main_shortMethod(JNIEnv* env, jclass klass, jshort s1, jshort s2,
	jshort s3, jshort s4, jshort s5, jshort s6,
	jshort s7, jshort s8, jshort s9, jshort s10) {
	typedef jshort (FnPtr_t)(JNIEnv, jclass, jshort, jshort, jshort, jshort, jshort,
	jshort, jshort, jshort, jshort, jshort);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("shortMethod")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10);
	}

	static jboolean trampoline_Java_Main_booleanMethod(JNIEnv* env, jclass klass, jboolean b1,
	jboolean b2, jboolean b3, jboolean b4,
	jboolean b5, jboolean b6, jboolean b7,
	jboolean b8, jboolean b9, jboolean b10) {
	typedef jboolean (FnPtr_t)(JNIEnv, jclass, jboolean, jboolean, jboolean, jboolean, jboolean,
	jboolean, jboolean, jboolean, jboolean, jboolean);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("booleanMethod")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
	}

	static jchar trampoline_Java_Main_charMethod(JNIEnv* env, jclass klass, jchar c1, jchar c2,
	jchar c3, jchar c4, jchar c5, jchar c6,
	jchar c7, jchar c8, jchar c9, jchar c10) {
	typedef jchar (FnPtr_t)(JNIEnv, jclass, jchar, jchar, jchar, jchar, jchar,
	jchar, jchar, jchar, jchar, jchar);
	FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("charMethod")->fnPtr);
	printf("%s called!\n", __FUNCTION__);
	return fnPtr(env, klass, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10);
	}

	NativeBridgeMethod gNativeBridgeMethods[] = {
	{ "JNI_OnLoad", "", true, nullptr,
	reinterpret_cast<void*>(trampoline_JNI_OnLoad) },
	{ "booleanMethod", "(ZZZZZZZZZZ)Z", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_booleanMethod) },
	{ "byteMethod", "(BBBBBBBBBB)B", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_byteMethod) },
	{ "charMethod", "(CCCCCCCCCC)C", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_charMethod) },
	{ "shortMethod", "(SSSSSSSSSS)S", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_shortMethod) },
	{ "testCallStaticVoidMethodOnSubClassNative", "()V", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative) },
	{ "testFindClassOnAttachedNativeThread", "()V", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_testFindClassOnAttachedNativeThread) },
	{ "testFindFieldOnAttachedNativeThreadNative", "()V", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative) },
	{ "testGetMirandaMethodNative", "()Ljava/lang/reflect/Method;", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_testGetMirandaMethodNative) },
	{ "testZeroLengthByteBuffers", "()V", true, nullptr,
	reinterpret_cast<void*>(trampoline_Java_Main_testZeroLengthByteBuffers) },
	};

	static NativeBridgeMethod* find_native_bridge_method(const char *name) {
	const char* pname = name;
	if (strncmp(name, "Java_Main_", 10) == 0) {
	pname += 10;
	}

	for (size_t i = 0; i < sizeof(gNativeBridgeMethods) / sizeof(gNativeBridgeMethods[0]); i++) {
	if (strcmp(pname, gNativeBridgeMethods[i].name) == 0) {
	return &gNativeBridgeMethods[i];
	}
	}
	return nullptr;
	}

	// NativeBridgeCallbacks implementations
	extern "C" bool native_bridge_initialize(const android::NativeBridgeRuntimeCallbacks* art_cbs,
	const char* private_dir, const char* isa) {
	if (art_cbs != nullptr) {
	gNativeBridgeArtCallbacks = art_cbs;
	printf("Native bridge initialized.\n");
	}
	return true;
	}

	extern "C" void* native_bridge_loadLibrary(const char* libpath, int flag) {
	size_t len = strlen(libpath);
	char* tmp = new char[len + 10];
	strncpy(tmp, libpath, len);
	tmp[len - 3] = '2';
	tmp[len - 2] = '.';
	tmp[len - 1] = 's';
	tmp[len] = 'o';
	tmp[len + 1] = 0;
	void* handle = dlopen(tmp, flag);
	delete[] tmp;

	if (handle == nullptr) {
	printf("Handle = nullptr!\n");
	printf("Was looking for %s.\n", libpath);
	printf("Error = %s.\n", dlerror());
	char cwd[1024];
	if (getcwd(cwd, sizeof(cwd)) != nullptr) {
	printf("Current working dir: %s\n", cwd);
	}
	}
	return handle;
	}

	extern "C" void* native_bridge_getTrampoline(void* handle, const char* name, const char* shorty,
	uint32_t len) {
	printf("Getting trampoline for %s with shorty %s.\n", name, shorty);

	// The name here is actually the JNI name, so we can directly do the lookup.
	void* sym = dlsym(handle, name);
	NativeBridgeMethod* method = find_native_bridge_method(name);
	if (method == nullptr)
	return nullptr;
	method->fnPtr = sym;

	return method->trampoline;
	}

	extern "C" bool native_bridge_isSupported(const char* libpath) {
	printf("Checking for support.\n");

	if (libpath == nullptr) {
	return false;
	}
	// We don't want to hijack javacore. So we should get libarttest...
	return strcmp(libpath, "libjavacore.so") != 0;
	}

	namespace android {

	// Environment values required by the apps running with native bridge.
	struct NativeBridgeRuntimeValues {
	const char* os_arch;
	const char* cpu_abi;
	const char* cpu_abi2;
	const char* *supported_abis;
	int32_t abi_count;
	};

	} // namespace android

	const char* supported_abis[] = {
	"supported1", "supported2", "supported3"
	};

	const struct android::NativeBridgeRuntimeValues nb_env {
	.os_arch = "os.arch",
	.cpu_abi = "cpu_abi",
	.cpu_abi2 = "cpu_abi2",
	.supported_abis = supported_abis,
	.abi_count = 3
	};

	extern "C" const struct android::NativeBridgeRuntimeValues* native_bridge_getAppEnv(
	const char* abi) {
	printf("Checking for getEnvValues.\n");

	if (abi == nullptr) {
	return nullptr;
	}

	return &nb_env;
	}

	// "NativeBridgeItf" is effectively an API (it is the name of the symbol that will be loaded
	// by the native bridge library).
	android::NativeBridgeCallbacks NativeBridgeItf {
	.version = 1,
	.initialize = &native_bridge_initialize,
	.loadLibrary = &native_bridge_loadLibrary,
	.getTrampoline = &native_bridge_getTrampoline,
	.isSupported = &native_bridge_isSupported,
	.getAppEnv = &native_bridge_getAppEnv
	};