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imkivaimkiva
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csjvm: initial commit
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‎.gitignore

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# Compiled Object files
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*.slo
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*.lo
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*.o
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*.obj
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# Precompiled Headers
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*.gch
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*.pch
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# Compiled Dynamic libraries
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*.so
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*.dylib
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*.dll
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# Fortran module files
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*.mod
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*.smod
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# Compiled Static libraries
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*.lai
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*.la
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*.a
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*.lib
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# Executables
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*.exe
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*.out
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*.app
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# Logs
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*.log
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.idea/
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cmake-build-*/
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.DS_Store
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# built application files
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*.apk
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*.ap_
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# files for the dex VM
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*.dex
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# Java class files
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*.class
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# generated files
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bin/
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gen/
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# Local configuration file (sdk path, etc)
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local.properties
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# Eclipse project files
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.classpath
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.project
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# Proguard folder generated by Eclipse
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proguard/
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# Intellij project files
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*.iml
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*.ipr
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*.iws
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.idea/
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*.iml
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.gradle
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/local.properties
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/.idea/workspace.xml
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/.idea/libraries
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.DS_Store
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/build
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/captures
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.externalNativeBuild
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‎CMakeLists.txt

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cmake_minimum_required(VERSION 3.4)
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project(covscript-jvm)
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include_directories(include)
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include_directories(../covscript/include)
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set(CMAKE_CXX_STANDARD 11)
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set(CMAKE_CXX_FLAGS " -fPIC -O3")
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if (NOT DEFINED ENV{JAVA_HOME})
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message(FATAL_ERROR "Environment variable required: JAVA_HOME")
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endif ()
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set(JAVA_HOME $ENV{JAVA_HOME})
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LINK_DIRECTORIES(${JAVA_HOME}/jre/lib)
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LINK_DIRECTORIES(${JAVA_HOME}/jre/lib/server)
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INCLUDE_DIRECTORIES(${JAVA_HOME}/include)
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set(CMAKE_BUILD_RPATH ${JAVA_HOME}/jre/lib ${JAVA_HOME}/jre/lib/server)
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IF (WIN32)
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message(FATAL_ERROR "Windows is not supported")
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ELSEIF (APPLE)
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INCLUDE_DIRECTORIES(${JAVA_HOME}/include/darwin)
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ELSEIF (UNIX)
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message(FATAL_ERROR "Unix is not supported.")
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ENDIF ()
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add_library(csjvm SHARED jvm.cpp)
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target_link_libraries(csjvm jvm)
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set_target_properties(csjvm PROPERTIES PREFIX "")
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set_target_properties(csjvm PROPERTIES SUFFIX ".cse")
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‎HelloWorld.java

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public class HelloWorld {
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public static void main(String[] args) {
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System.out.println("hello world");
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}
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}

‎hello-world.csc

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import csjvm
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var vm = csjvm.create_JavaVM({"-Djava.class.path=."})
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var clazz = vm.find_class("HelloWorld")
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var method = vm.get_static_method(clazz, "main", "([Ljava/lang/String;)V")
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vm.call_static_void_method(clazz, method, {})
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vm.destroy_JavaVM()

‎jvm.cpp

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#include <covscript/cni.hpp>
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#include <covscript/extension.hpp>
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#include <jni.h>
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static JavaVM *jvm;
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static JNIEnv *env;
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static cs::extension jvm_ext;
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static cs::extension_t jvm_ext_shared = cs::make_shared_extension(jvm_ext);
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namespace csjvm {
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using namespace cs;
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struct jvm_instance {
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JavaVM *jvm = nullptr;
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JNIEnv *env = nullptr;
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JavaVMInitArgs args;
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int options_count = 0;
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JavaVMOption *options = nullptr;
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};
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struct jvm_holder {
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jvm_instance *instance;
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};
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static void dealloc_instance(jvm_instance *instance) {
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for (int i = 0; i < instance->options_count; ++i) {
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free(instance->options[i].optionString);
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}
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delete[] instance->options;
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delete instance;
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}
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jvm_holder create_JavaVM(const array &optionsArray) {
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jvm_holder holder{nullptr};
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holder.instance = new jvm_instance;
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holder.instance->args.version = JNI_VERSION_1_8;
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holder.instance->options_count = static_cast<int>(optionsArray.size());
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holder.instance->args.nOptions = static_cast<jint>(holder.instance->options_count);
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holder.instance->options = new JavaVMOption[optionsArray.size()];
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for (int i = 0; i < holder.instance->options_count; ++i) {
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var optionString = optionsArray[i];
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holder.instance->options[i].optionString =
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strdup(optionString.to_string().c_str());
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}
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holder.instance->args.options = holder.instance->options;
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holder.instance->args.ignoreUnrecognized = JNI_FALSE;
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JavaVM *javaVM;
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JNIEnv *env;
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jint result = JNI_CreateJavaVM(&javaVM, (void **) &env, &holder.instance->args);
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if (result == JNI_OK) {
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holder.instance->jvm = javaVM;
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holder.instance->env = env;
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} else {
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dealloc_instance(holder.instance);
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holder.instance = nullptr;
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}
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return holder;
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}
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void destroy_JavaVM(jvm_holder &holder) {
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if (holder.instance != nullptr) {
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dealloc_instance(holder.instance);
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holder.instance = nullptr;
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}
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}
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jclass find_class(const jvm_holder &holder, const cs::string &name) {
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if (holder.instance == nullptr) {
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return nullptr;
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}
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return holder.instance->env->FindClass(name.c_str());
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}
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jmethodID get_static_method(const jvm_holder &holder,
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const jclass clazz,
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const cs::string &name,
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const cs::string &signature) {
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if (holder.instance == nullptr || clazz == nullptr) {
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return nullptr;
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}
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return holder.instance->env->GetStaticMethodID(clazz, name.c_str(), signature.c_str());
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}
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void call_static_void_method(const jvm_holder &holder, jclass clazz,
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jmethodID method, array args) {
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if (holder.instance == nullptr || clazz == nullptr || method == nullptr) {
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return;
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}
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holder.instance->env->CallStaticVoidMethod(clazz, method);
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}
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void init() {
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jvm_ext.add_var("create_JavaVM", var::make_protect<callable>(cni(create_JavaVM), true));
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jvm_ext.add_var("destroy_JavaVM", var::make_protect<callable>(cni(destroy_JavaVM), true));
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jvm_ext.add_var("find_class", var::make_protect<callable>(cni(find_class), true));
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jvm_ext.add_var("get_static_method", var::make_protect<callable>(cni(get_static_method), true));
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jvm_ext.add_var("call_static_void_method", var::make_protect<callable>(cni(call_static_void_method), true));
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}
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}
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namespace cs_impl {
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template<>
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cs::extension_t &get_ext<csjvm::jvm_holder>() {
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return jvm_ext_shared;
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}
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template<>
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constexpr const char *get_name_of_type<csjvm::jvm_holder>() {
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return "csjvm::JavaVM";
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}
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template<>
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constexpr const char *get_name_of_type<jclass>() {
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return "csjvm::JavaClass";
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}
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template<>
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constexpr const char *get_name_of_type<jmethodID>() {
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return "csjvm::JavaMethod";
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}
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template<>
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constexpr const char *get_name_of_type<jfieldID>() {
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return "csjvm::JavaField";
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}
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template<>
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constexpr const char *get_name_of_type<jobject>() {
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return "csjvm::JavaObject";
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}
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template<>
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constexpr const char *get_name_of_type<jthrowable>() {
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return "csjvm::JavaThrowable";
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}
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template<>
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constexpr const char *get_name_of_type<jstring>() {
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return "csjvm::JavaString";
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}
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template<>
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constexpr const char *get_name_of_type<jarray>() {
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return "csjvm::JavaArray";
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}
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template<>
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constexpr const char *get_name_of_type<jbooleanArray>() {
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return "csjvm::JavaBooleanArray";
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}
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template<>
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constexpr const char *get_name_of_type<jintArray>() {
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return "csjvm::JavaIntegerArray";
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}
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template<>
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constexpr const char *get_name_of_type<jfloatArray>() {
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return "csjvm::JavaFloatArray";
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}
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template<>
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constexpr const char *get_name_of_type<jdoubleArray>() {
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return "csjvm::JavaDoubleArray";
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}
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template<>
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constexpr const char *get_name_of_type<jcharArray>() {
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return "csjvm::JavaCharacterArray";
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}
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template<>
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constexpr const char *get_name_of_type<jbyteArray>() {
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return "csjvm::JavaByteArray";
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}
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template<>
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constexpr const char *get_name_of_type<jshortArray>() {
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return "csjvm::JavaShortArray";
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}
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template<>
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constexpr const char *get_name_of_type<jboolean>() {
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return "csjvm::JavaBoolean";
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}
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template<>
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constexpr const char *get_name_of_type<jint>() {
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return "csjvm::JavaInteger";
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}
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template<>
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constexpr const char *get_name_of_type<jfloat>() {
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return "csjvm::JavaFloat";
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}
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template<>
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constexpr const char *get_name_of_type<jdouble>() {
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return "csjvm::JavaDouble";
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}
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template<>
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constexpr const char *get_name_of_type<jchar>() {
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return "csjvm::JavaCharacter";
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}
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template<>
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constexpr const char *get_name_of_type<jbyte>() {
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return "csjvm::JavaByte";
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}
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template<>
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constexpr const char *get_name_of_type<jshort>() {
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return "csjvm::JavaShort";
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}
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}
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cs::extension *cs_extension() {
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csjvm::init();
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return &jvm_ext;
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}

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