jsj.c

caffeine-monkey java实现的js模拟引擎

    LOAD_METHOD(java.lang.Boolean,          booleanValue,       "()Z",                          jlBoolean);
    
    LOAD_STATIC_METHOD(java.lang.System,    identityHashCode,   "(Ljava/lang/Object;)I",        jlSystem);

    LOAD_CONSTRUCTOR(java.lang.Boolean,     Boolean,            "(Z)V",                         jlBoolean);
    LOAD_CONSTRUCTOR(java.lang.Double,      Double,             "(D)V",                         jlDouble);

    LOAD_FIELD_OBJ(java.lang.Void,          TYPE,               "Ljava/lang/Class;",            jlVoid);
  
    return JS_TRUE;
}

#if !defined(OJI) 

/**
 * Workaround for the fact that MRJ loads a different instance of the shared library.
 */

#include "netscape_javascript_JSObject.h"

/* Manually load the required native methods. */
static JSBool
JSObject_RegisterNativeMethods(JNIEnv* jEnv)
{

    static JNINativeMethod nativeMethods[] = {
        {"initClass", "()V", (void*)&Java_netscape_javascript_JSObject_initClass},

#ifndef OJI
        {"getMember", "(Ljava/lang/String;)Ljava/lang/Object;", (void*)&Java_netscape_javascript_JSObject_getMember},
        {"getSlot", "(I)Ljava/lang/Object;", (void*)&Java_netscape_javascript_JSObject_getSlot},
        {"setMember", "(Ljava/lang/String;Ljava/lang/Object;)V", (void*)&Java_netscape_javascript_JSObject_setMember},
        {"setSlot", "(ILjava/lang/Object;)V", (void*)&Java_netscape_javascript_JSObject_setSlot},
        {"removeMember", "(Ljava/lang/String;)V", (void*)&Java_netscape_javascript_JSObject_removeMember},
        {"call", "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/Object;", (void*)&Java_netscape_javascript_JSObject_call},
        {"eval", "(Ljava/lang/String;)Ljava/lang/Object;", (void*)&Java_netscape_javascript_JSObject_eval},
        
        {"toString", "()Ljava/lang/String;", (void*)&Java_netscape_javascript_JSObject_toString},
        {"getWindow", "(Ljava/applet/Applet;)Lnetscape/javascript/JSObject;", (void*)&Java_netscape_javascript_JSObject_getWindow},
        {"finalize", "()V", (void*)&Java_netscape_javascript_JSObject_finalize},
        {"equals", "(Ljava/lang/Object;)Z", (void*)&Java_netscape_javascript_JSObject_equals}
#endif  /* !OJI */

    };
    (*jEnv)->RegisterNatives(jEnv, njJSObject, nativeMethods, sizeof(nativeMethods) / sizeof(JNINativeMethod));
    if ((*jEnv)->ExceptionOccurred(jEnv)) {
        report_java_initialization_error(jEnv, "Couldn't initialize JSObject native methods.");
        (*jEnv)->ExceptionClear(jEnv);
        return JS_FALSE;
    }
    /* Call the initClass method */
    Java_netscape_javascript_JSObject_initClass(jEnv, njJSObject);
    return JS_TRUE;
}

#endif

/* Load Netscape-specific Java extension classes, methods, and fields */
static JSBool
init_netscape_java_classes(JSJavaVM *jsjava_vm, JNIEnv *jEnv)
{
    LOAD_CLASS(netscape/javascript/JSObject,    njJSObject);
    LOAD_CLASS(netscape/javascript/JSException, njJSException);
    LOAD_CLASS(netscape/javascript/JSUtil,      njJSUtil);

#if !defined(OJI) 
    JSObject_RegisterNativeMethods(jEnv);
#endif

#ifndef OJI
    LOAD_CONSTRUCTOR(netscape.javascript.JSObject,
                                            JSObject,           "(I)V",                         njJSObject);
#endif
    LOAD_CONSTRUCTOR(netscape.javascript.JSException,
                                            JSException,        "(Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;I)V",
                                                                                                njJSException);

    /* Load second constructor for wrapping JS exception objects inside JSExceptions */
    _LOAD_METHOD(netscape.javascript.JSException,<init>,
                 JSException_wrap, "(ILjava/lang/Object;)V",        
                 njJSException, JS_FALSE);

#ifndef OJI
    LOAD_FIELDID(netscape.javascript.JSObject,  
                                            internal,           "I",                            njJSObject);
#endif
    LOAD_FIELDID(netscape.javascript.JSException,  
                                            lineno,             "I",                            njJSException);
    LOAD_FIELDID(netscape.javascript.JSException,  
                                            tokenIndex,         "I",                            njJSException);
    LOAD_FIELDID(netscape.javascript.JSException,  
                                            source,             "Ljava/lang/String;",           njJSException);
    LOAD_FIELDID(netscape.javascript.JSException,  
                                            filename,           "Ljava/lang/String;",           njJSException);
    LOAD_FIELDID(netscape.javascript.JSException, wrappedExceptionType, "I",
                 njJSException);
    LOAD_FIELDID(netscape.javascript.JSException, wrappedException,
                 "Ljava/lang/Object;", njJSException);

    LOAD_STATIC_METHOD(netscape.javascript.JSUtil,
                                            getStackTrace,      "(Ljava/lang/Throwable;)Ljava/lang/String;",
                                                                                                njJSUtil);

    return JS_TRUE;
}

JSJavaVM *jsjava_vm_list = NULL;

static JSJavaThreadState *thread_list = NULL;

#ifdef JSJ_THREADSAFE
static PRMonitor *thread_list_monitor = NULL;
#endif

/*
 * Called once per Java VM, this function initializes the classes, fields, and
 * methods required for Java reflection.  If java_vm is NULL, a new Java VM is
 * created, using the provided classpath in addition to any default classpath.
 * The classpath argument is ignored, however, if java_vm_arg is non-NULL.
 */
JSJavaVM *
JSJ_ConnectToJavaVM(SystemJavaVM *java_vm_arg, void* initargs)
{
    SystemJavaVM* java_vm;
    JSJavaVM *jsjava_vm;
    JNIEnv *jEnv;

    JS_ASSERT(JSJ_callbacks);
    JS_ASSERT(JSJ_callbacks->attach_current_thread);
    JS_ASSERT(JSJ_callbacks->detach_current_thread);
    JS_ASSERT(JSJ_callbacks->get_java_vm);

    jsjava_vm = (JSJavaVM*)malloc(sizeof(JSJavaVM));
    if (!jsjava_vm)
        return NULL;
    memset(jsjava_vm, 0, sizeof(JSJavaVM));

    java_vm = java_vm_arg;

    /* If a Java VM was passed in, try to attach to it on the current thread. */
    if (java_vm) {
        jEnv = JSJ_callbacks->attach_current_thread(java_vm);
        if (jEnv == NULL) {
            jsj_LogError("Failed to attach to Java VM thread\n");
            free(jsjava_vm);
            return NULL;
        }

        jsjava_vm->java_vm = java_vm;
        jsjava_vm->main_thread_env = jEnv;
    } else {
        jsjava_vm->init_args = initargs;
    }
       
#ifdef JSJ_THREADSAFE
    if (jsjava_vm_list == NULL) {
        thread_list_monitor =
            (struct PRMonitor *) PR_NewMonitor();
    }
#endif	/* JSJ_THREADSAFE */

    /* Put this VM on the list of all created VMs */
    jsjava_vm->next = jsjava_vm_list;
    jsjava_vm_list = jsjava_vm;

    return jsjava_vm;
}

/* Completes a lazy connection to the host Java VM. */
static JSBool
jsj_ConnectToJavaVM(JSJavaVM *jsjava_vm)
{
    if (!jsjava_vm->java_vm) {
        JSBool ok;
        JS_ASSERT(JSJ_callbacks->create_java_vm);
        JS_ASSERT(JSJ_callbacks->destroy_java_vm);

        ok = JSJ_callbacks->create_java_vm(&jsjava_vm->java_vm,
                                           &jsjava_vm->main_thread_env,
                                           jsjava_vm->init_args);
        if (!ok) {
            jsj_LogError("Failed to create Java VM\n");
            return JS_FALSE;
        }

        /* Remember that we created the VM so that we know to destroy it later */
        jsjava_vm->jsj_created_java_vm = JS_TRUE;
    }
    
    if (!jsjava_vm->jsj_inited_java_vm) {
        /*
         * JVM initialization for netscape.javascript.JSObject is performed
         * independently of the other classes that are initialized in
         * init_java_VM_reflection, because we allow it to fail.  In the case
         * of failure, LiveConnect is still operative, but only when calling
         * from JS to Java and not vice-versa.
         */
        init_netscape_java_classes(jsjava_vm, jsjava_vm->main_thread_env);

        /* Load the Java classes, and the method and field descriptors required for
           Java reflection. */
        if (!init_java_VM_reflection(jsjava_vm, jsjava_vm->main_thread_env) || 
            !jsj_InitJavaObjReflectionsTable()) {
            jsj_LogError("LiveConnect was unable to reflect one or more components of the Java runtime.\nGo to http://bugzilla.mozilla.org/show_bug.cgi?id=5369 for details.\n");
            /* This function crashes when called from here.
               Check that all the preconditions for this
               call are satisfied before making it. [jd]
               JSJ_DisconnectFromJavaVM(jsjava_vm); */
            return JS_FALSE;
        }
        
        jsjava_vm->jsj_inited_java_vm = JS_TRUE;
    }

    return JS_TRUE;
}

JSJCallbacks *JSJ_callbacks = NULL;

/* Called once to set up callbacks for all instances of LiveConnect */
void
JSJ_Init(JSJCallbacks *callbacks)
{
    JS_ASSERT(callbacks);
    JSJ_callbacks = callbacks;
}

/*
 * Initialize the provided JSContext by setting up the JS classes necessary for
 * reflection and by defining JavaPackage objects for the default Java packages
 * as properties of global_obj.  Additional packages may be pre-defined by
 * setting the predefined_packages argument.  (Pre-defining a Java package at
 * initialization time is not necessary, but it will make package lookup faster
 * and, more importantly, will avoid unnecessary network accesses if classes
 * are being loaded over the network.)
 */
JSBool
JSJ_InitJSContext(JSContext *cx, JSObject *global_obj,
                  JavaPackageDef *predefined_packages)
{
    /* Initialize the JavaScript classes used for reflection */
    if (!jsj_init_JavaObject(cx, global_obj))
        return JS_FALSE;
    
/*    if (!jsj_init_JavaMember(cx, global_obj))
        return JS_FALSE; */
    
    if (!jsj_init_JavaPackage(cx, global_obj, predefined_packages))
        return JS_FALSE;

    if (!jsj_init_JavaClass(cx, global_obj))
        return JS_FALSE;

    if (!jsj_init_JavaArray(cx, global_obj))
        return JS_FALSE;

    if (!jsj_init_JavaMember(cx, global_obj))
        return JS_FALSE;
    
    return JS_TRUE;
}

/* Eliminate a reference to a Java class */
#define UNLOAD_CLASS(qualified_name, class)                                  \
    if (class) {                                                             \
        (*jEnv)->DeleteGlobalRef(jEnv, class);                               \
        class = NULL;                                                        \
    }

/*
 * This routine severs the connection to a Java VM, freeing all related resources.
 * It shouldn't be called until the global scope has been cleared in all related
 * JSContexts (so that all LiveConnect objects are finalized) and a JavaScript
 * GC is performed.  Otherwise, accessed to free'ed memory could result.
 */
void
JSJ_DisconnectFromJavaVM(JSJavaVM *jsjava_vm)
{
    SystemJavaVM *java_vm;
    JSJavaVM *j, **jp;

    /* Since JSJ_ConnectToJavaVM is now lazy */
    java_vm = jsjava_vm->java_vm;
    if (java_vm) {
        JNIEnv *jEnv = jsjava_vm->main_thread_env;

        /* Drop all references to Java objects and classes */
        jsj_DiscardJavaObjReflections(jEnv);
        jsj_DiscardJavaClassReflections(jEnv);

        if (jsjava_vm->jsj_created_java_vm) { 
            (void)JSJ_callbacks->destroy_java_vm(java_vm, jEnv);
        } else {
            UNLOAD_CLASS(java/lang/Object,                jlObject);
            UNLOAD_CLASS(java/lang/Class,                 jlClass);
            UNLOAD_CLASS(java/lang/reflect/Method,        jlrMethod);