// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
-/* Copyright (C) 1999 Cygnus Solutions
+/* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation
This file is part of libgcj.
#include <config.h>
#include <stdlib.h>
+#include <stdio.h>
#include <string.h>
-#include <cni.h>
+#include <gcj/cni.h>
#include <jvm.h>
+#include <execution.h>
+
+#include <java-threads.h>
+#include <java-interp.h>
+
#include <java/lang/Character.h>
#include <java/lang/Thread.h>
#include <java/lang/ClassLoader.h>
-#include <gnu/gcj/runtime/VMClassLoader.h>
#include <java/lang/InternalError.h>
#include <java/lang/IllegalAccessError.h>
#include <java/lang/LinkageError.h>
-#include <java/lang/ClassFormatError.h>
#include <java/lang/NoClassDefFoundError.h>
#include <java/lang/ClassNotFoundException.h>
#include <java/lang/ClassCircularityError.h>
#include <java/lang/IncompatibleClassChangeError.h>
+#include <java/lang/ClassFormatError.h>
+#include <java/lang/VirtualMachineError.h>
+#include <java/lang/VMClassLoader.h>
#include <java/lang/reflect/Modifier.h>
+#include <java/lang/Runtime.h>
+#include <java/lang/StringBuffer.h>
+#include <java/io/Serializable.h>
+#include <java/lang/Cloneable.h>
+#include <java/util/HashMap.h>
+#include <gnu/gcj/runtime/BootClassLoader.h>
+#include <gnu/gcj/runtime/SystemClassLoader.h>
-#include <java-interp.h>
+// Size of local hash table.
+#define HASH_LEN 1013
-#define CloneableClass _CL_Q34java4lang9Cloneable
-extern java::lang::Class CloneableClass;
-#define ObjectClass _CL_Q34java4lang6Object
-extern java::lang::Class ObjectClass;
-#define ClassClass _CL_Q34java4lang5Class
-extern java::lang::Class ClassClass;
-#define VMClassLoaderClass _CL_Q34java4lang17VMClassLoader
-extern java::lang::Class VMClassLoader;
-#define ClassLoaderClass _CL_Q34java4lang11ClassLoader
-extern java::lang::Class ClassLoaderClass;
-
-/////////// java.lang.ClassLoader native methods ////////////
-
-#ifdef INTERPRETER
-gnu::gcj::runtime::VMClassLoader *redirect = 0;
-#endif
-
-java::lang::ClassLoader*
-java::lang::ClassLoader::getVMClassLoader0 ()
-{
-#ifdef INTERPRETER
- if (redirect == 0)
- redirect = new gnu::gcj::runtime::VMClassLoader;
- return redirect;
-#else
- return 0;
-#endif
-}
+// Hash function for Utf8Consts.
+#define HASH_UTF(Utf) ((Utf)->hash16() % HASH_LEN)
-void
-java::lang::ClassLoader::defineClass2 (jclass klass, jbyteArray data,
- jint offset, jint length)
-{
-#ifdef INTERPRETER
- _Jv_DefineClass (klass, data, offset, length);
-#endif
-}
+// This records classes which will be registered with the system class
+// loader when it is initialized.
+static jclass system_class_list;
-java::lang::Class *
-java::lang::ClassLoader::defineClass0 (jstring name,
- jbyteArray data,
- jint offset,
- jint length)
-{
-#ifdef INTERPRETER
- jclass klass;
- klass = (jclass) JvAllocObject (&ClassClass, sizeof (_Jv_InterpClass));
+// This is used as the value of system_class_list after we have
+// initialized the system class loader; it lets us know that we should
+// no longer pay attention to the system abi flag.
+#define SYSTEM_LOADER_INITIALIZED ((jclass) -1)
- // synchronize on the class, so that it is not
- // attempted initialized until we're done loading.
- _Jv_MonitorEnter (klass);
+static jclass loaded_classes[HASH_LEN];
- // record which is the defining loader
- klass->loader = this;
+// This is the root of a linked list of classes
+static jclass stack_head;
- // register that we are the initiating loader...
- if (name != 0)
- {
- _Jv_Utf8Const * name2 = _Jv_makeUtf8Const (name);
+// While bootstrapping we keep a list of classes we found, so that we
+// can register their packages. There aren't many of these so we
+// just keep a small buffer here and abort if we overflow.
+#define BOOTSTRAP_CLASS_LIST_SIZE 20
+static jclass bootstrap_class_list[BOOTSTRAP_CLASS_LIST_SIZE];
+static int bootstrap_index;
- _Jv_VerifyClassName (name2);
- klass->name = name2;
- }
+\f
- // this will do the magic. loadInto also operates
- // as an exception trampoline for now...
- Throwable *ex = defineClass1 (klass, data, offset, length);
-
- if (ex) // we failed to load it
- {
- klass->state = JV_STATE_ERROR;
- klass->notifyAll ();
-
- _Jv_UnregisterClass (klass);
-
- _Jv_MonitorExit (klass);
-
- // FIXME: Here we may want to test that EX does
- // indeed represent a valid exception. That is,
- // anything but ClassNotFoundException,
- // or some kind of Error.
-
- JvThrow (ex);
- }
-
- // if everything proceeded sucessfully, we're loaded.
- JvAssert (klass->state == JV_STATE_LOADED);
+jclass
+java::lang::ClassLoader::loadClassFromSig(jstring name)
+{
+ int len = _Jv_GetStringUTFLength (name);
+ char sig[len + 1];
+ _Jv_GetStringUTFRegion (name, 0, name->length(), sig);
+ jclass result = _Jv_FindClassFromSignature(sig, this);
+ if (result == NULL)
+ throw new ClassNotFoundException(name);
+ return result;
+}
- // if an exception is generated, this is initially missed.
- // however, we come back here in handleException0 below...
- _Jv_MonitorExit (klass);
+\f
- return klass;
+// This tries to find a class in our built-in cache. This cache is
+// used only for classes which are linked in to the executable or
+// loaded via dlopen().
+jclass
+_Jv_FindClassInCache (_Jv_Utf8Const *name)
+{
+ JvSynchronize sync (&java::lang::Class::class$);
+ jint hash = HASH_UTF (name);
-#else // INTERPRETER
+ jclass klass;
+ for (klass = loaded_classes[hash]; klass; klass = klass->next_or_version)
+ {
+ if (_Jv_equalUtf8Consts (name, klass->name))
+ break;
+ }
- return 0;
-#endif
+ return klass;
}
void
-_Jv_WaitForState (jclass klass, int state)
+_Jv_UnregisterClass (jclass the_class)
{
- if (klass->state >= state)
+ // This can happen if the class could not be defined properly.
+ if (! the_class->name)
return;
-
- _Jv_MonitorEnter (klass) ;
-
- if (state == JV_STATE_LINKED)
- {
- _Jv_MonitorExit (klass);
- _Jv_PrepareCompiledClass (klass);
- return;
- }
-
- java::lang::Thread *self = java::lang::Thread::currentThread();
-
- // this is similar to the strategy for class initialization.
- // if we already hold the lock, just leave.
- while (klass->state <= state
- && klass->thread
- && klass->thread != self)
- klass->wait ();
- _Jv_MonitorExit (klass);
+ JvSynchronize sync (&java::lang::Class::class$);
+ jint hash = HASH_UTF(the_class->name);
- if (klass->state == JV_STATE_ERROR)
+ jclass *klass = &(loaded_classes[hash]);
+ for ( ; *klass; klass = &((*klass)->next_or_version))
{
- _Jv_Throw (new java::lang::LinkageError ());
+ if (*klass == the_class)
+ {
+ *klass = (*klass)->next_or_version;
+ break;
+ }
}
}
-// Finish linking a class. Only called from ClassLoader::resolveClass.
+// Register an initiating class loader for a given class.
void
-java::lang::ClassLoader::linkClass0 (java::lang::Class *klass)
+_Jv_RegisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
{
- if (klass->state >= JV_STATE_LINKED)
- return;
-
-#ifdef INTERPRETER
- if (_Jv_IsInterpretedClass (klass))
+ if (! loader)
+ loader = java::lang::VMClassLoader::bootLoader;
+ if (! loader)
{
- _Jv_PrepareClass (klass);
+ // Very early in the bootstrap process, the Bootstrap classloader may
+ // not exist yet.
+ // FIXME: We could maintain a list of these and come back and register
+ // them later.
+ return;
}
-#endif
-
- _Jv_PrepareCompiledClass (klass);
+ loader->loadedClasses->put(klass->name->toString(), klass);
}
+// If we found an error while defining an interpreted class, we must
+// go back and unregister it.
void
-java::lang::ClassLoader::markClassErrorState0 (java::lang::Class *klass)
+_Jv_UnregisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
{
- klass->state = JV_STATE_ERROR;
- klass->notifyAll ();
+ if (! loader)
+ loader = java::lang::VMClassLoader::bootLoader;
+ loader->loadedClasses->remove(klass->name->toString());
}
-
-/** this is the only native method in VMClassLoader, so
- we define it here. */
-jclass
-gnu::gcj::runtime::VMClassLoader::findSystemClass (jstring name)
+// This function is called many times during startup, before main() is
+// run. At that point in time we know for certain we are running
+// single-threaded, so we don't need to lock when adding classes to the
+// class chain. At all other times, the caller should synchronize on
+// Class::class$.
+void
+_Jv_RegisterClasses (const jclass *classes)
{
- return _Jv_FindClassInCache (_Jv_makeUtf8Const (name), 0);
-}
+ _Jv_RegisterLibForGc (classes);
-jclass
-java::lang::ClassLoader::findLoadedClass (jstring name)
-{
- return _Jv_FindClassInCache (_Jv_makeUtf8Const (name), this);
-}
+ for (; *classes; ++classes)
+ {
+ jclass klass = *classes;
+ if (_Jv_CheckABIVersion ((unsigned long) klass->next_or_version))
+ (*_Jv_RegisterClassHook) (klass);
+ }
+}
-/** This function does class-preparation for compiled classes.
- NOTE: It contains replicated functionality from
- _Jv_ResolvePoolEntry, and this is intentional, since that function
- lives in resolve.cc which is entirely conditionally compiled.
- */
+// This is a version of _Jv_RegisterClasses that takes a count.
void
-_Jv_PrepareCompiledClass(jclass klass)
+_Jv_RegisterClasses_Counted (const jclass * classes, size_t count)
{
- if (klass->state >= JV_STATE_LINKED)
- return;
+ size_t i;
- // short-circuit, so that mutually dependent classes are ok
- klass->state = JV_STATE_LINKED;
+ _Jv_RegisterLibForGc (classes);
- _Jv_Constants *pool = &klass->constants;
- for (int index = 1; index < pool->size; ++index)
+ for (i = 0; i < count; i++)
{
- if (pool->tags[index] == JV_CONSTANT_Class)
- {
- _Jv_Utf8Const *name = pool->data[index].utf8;
-
- jclass found;
- if (name->data[0] == '[')
- found = _Jv_FindClassFromSignature (&name->data[0],
- klass->loader);
- else
- found = _Jv_FindClass (name, klass->loader);
-
- if (! found)
- {
- jstring str = _Jv_NewStringUTF (name->data);
- JvThrow (new java::lang::ClassNotFoundException (str));
- }
+ jclass klass = classes[i];
- pool->data[index].clazz = found;
- pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
- }
-
- else if (pool->tags[index] == JV_CONSTANT_String)
- {
- jstring str;
- str = _Jv_NewStringUtf8Const (pool->data[index].utf8);
- pool->data[index].o = str;
- pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
- }
+ if (_Jv_CheckABIVersion ((unsigned long) klass->next_or_version))
+ (*_Jv_RegisterClassHook) (klass);
}
-
- klass->notifyAll ();
}
-
-//
-// A single class can have many "initiating" class loaders,
-// and a single "defining" class loader. The Defining
-// class loader is what is returned from Class.getClassLoader()
-// and is used when loading dependent classes during resolution.
-// The set of initiating class loaders are used to ensure
-// safety of linking, and is maintained in the hash table
-// "initiated_classes". A defining classloader is by definition also
-// initiating, so we only store classes in this table, if they have more
-// than one class loader associated.
-//
-
-
-// Size of local hash table.
-#define HASH_LEN 1013
-
-// Hash function for Utf8Consts.
-#define HASH_UTF(Utf) (((Utf)->hash) % HASH_LEN)
-
-struct _Jv_LoaderInfo {
- _Jv_LoaderInfo *next;
- java::lang::Class *klass;
- java::lang::ClassLoader *loader;
-};
-
-_Jv_LoaderInfo *initiated_classes[HASH_LEN];
-jclass loaded_classes[HASH_LEN];
-
+// Create a class on the heap from an initializer struct.
jclass
-_Jv_FindClassInCache (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
+_Jv_NewClassFromInitializer (const jclass class_initializer)
{
- _Jv_MonitorEnter (&ClassClass);
- jint hash = HASH_UTF (name);
+ jclass new_class = (jclass)_Jv_AllocObj (sizeof *new_class,
+ &java::lang::Class::class$);
+ memcpy ((void*)new_class, (void*)class_initializer, sizeof *new_class);
- // first, if LOADER is a defining loader, then it is also initiating
- jclass klass;
- for (klass = loaded_classes[hash]; klass; klass = klass->next)
- {
- if (loader == klass->loader && _Jv_equalUtf8Consts (name, klass->name))
- break;
- }
+ if (_Jv_CheckABIVersion ((unsigned long) new_class->next_or_version))
+ (*_Jv_RegisterClassHook) (new_class);
+
+ return new_class;
+}
- // otherwise, it may be that the class in question was defined
- // by some other loader, but that the loading was initiated by
- // the loader in question.
- if (!klass)
- {
- _Jv_LoaderInfo *info;
- for (info = initiated_classes[hash]; info; info = info->next)
- {
- if (loader == info->loader
- && _Jv_equalUtf8Consts (name, info->klass->name))
- {
- klass = info->klass;
- break;
- }
- }
- }
+// Called by compiler-generated code at DSO initialization. CLASSES
+// is an array of pairs: the first item of each pair is a pointer to
+// the initialized data that is a class initializer in a DSO, and the
+// second is a pointer to a class reference.
+// _Jv_NewClassFromInitializer() creates the new class (on the Java
+// heap) and we write the address of the new class into the address
+// pointed to by the second word.
+void
+_Jv_RegisterNewClasses (void **classes)
+{
+ _Jv_InitGC ();
- _Jv_MonitorExit (&ClassClass);
+ jclass initializer;
- return klass;
+ while ((initializer = (jclass)*classes++))
+ {
+ jclass *class_ptr = (jclass *)*classes++;
+ *class_ptr = _Jv_NewClassFromInitializer (initializer);
+ }
}
-
+
void
-_Jv_UnregisterClass (jclass the_class)
+_Jv_RegisterClassHookDefault (jclass klass)
{
- _Jv_MonitorEnter (&ClassClass);
- jint hash = HASH_UTF(the_class->name);
+ // This is bogus, but there doesn't seem to be a better place to do
+ // it.
+ if (! klass->engine)
+ klass->engine = &_Jv_soleCompiledEngine;
- jclass *klass = &(loaded_classes[hash]);
- for ( ; *klass; klass = &((*klass)->next))
+ if (system_class_list != SYSTEM_LOADER_INITIALIZED)
{
- if (*klass == the_class)
+ unsigned long abi = (unsigned long) klass->next_or_version;
+ if (! _Jv_ClassForBootstrapLoader (abi))
{
- *klass = (*klass)->next;
- break;
+ klass->next_or_version = system_class_list;
+ system_class_list = klass;
+ return;
}
}
- _Jv_LoaderInfo **info = &(initiated_classes[hash]);
- for ( ; *info; info = &((*info)->next))
+ jint hash = HASH_UTF (klass->name);
+
+ // If the class is already registered, don't re-register it.
+ for (jclass check_class = loaded_classes[hash];
+ check_class != NULL;
+ check_class = check_class->next_or_version)
{
- while ((*info)->klass == the_class)
+ if (check_class == klass)
{
- *info = (*info)->next;
+ // If you get this, it means you have the same class in two
+ // different libraries.
+#define TEXT "Duplicate class registration: "
+ // We size-limit MESSAGE so that you can't trash the stack.
+ char message[200];
+ strcpy (message, TEXT);
+ strncpy (message + sizeof (TEXT) - 1, klass->name->chars(),
+ sizeof (message) - sizeof (TEXT));
+ message[sizeof (message) - 1] = '\0';
+ if (! gcj::runtimeInitialized)
+ JvFail (message);
+ else
+ {
+ java::lang::String *str = JvNewStringLatin1 (message);
+ throw new java::lang::VirtualMachineError (str);
+ }
}
}
- _Jv_MonitorExit (&ClassClass);
-}
-
-void
-_Jv_RegisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
-{
- _Jv_LoaderInfo *info = new _Jv_LoaderInfo; // non-gc alloc!
- jint hash = HASH_UTF(klass->name);
-
- _Jv_MonitorEnter (&ClassClass);
- info->loader = loader;
- info->klass = klass;
- info->next = initiated_classes[hash];
- initiated_classes[hash] = info;
- _Jv_MonitorExit (&ClassClass);
-
+ klass->next_or_version = loaded_classes[hash];
+ loaded_classes[hash] = klass;
}
-// This function is called many times during startup, before main() is
-// run. We do our runtime initialization here the very first time we
-// are called. At that point in time we know for certain we are
-// running single-threaded, so we don't need to lock when modifying
-// `init'. CLASSES is NULL-terminated.
-void
-_Jv_RegisterClasses (jclass *classes)
-{
- static bool init = false;
+// A pointer to a function that actually registers a class.
+// Normally _Jv_RegisterClassHookDefault, but could be some other function
+// that registers the class in e.g. a ClassLoader-local table.
+// Should synchronize on Class:class$ while setting/restore this variable.
- if (! init)
- {
- init = true;
- _Jv_InitThreads ();
- _Jv_InitGC ();
- _Jv_InitializeSyncMutex ();
- }
-
- JvSynchronize sync (&ClassClass);
- for (; *classes; ++classes)
- {
- jclass klass = *classes;
- jint hash = HASH_UTF (klass->name);
- klass->next = loaded_classes[hash];
- loaded_classes[hash] = klass;
-
- // registering a compiled class causes
- // it to be immediately "prepared".
- if (klass->state == JV_STATE_NOTHING)
- klass->state = JV_STATE_COMPILED;
- }
-}
+void (*_Jv_RegisterClassHook) (jclass cl) = _Jv_RegisterClassHookDefault;
void
_Jv_RegisterClass (jclass klass)
_Jv_RegisterClasses (classes);
}
-#if 0
-// NOTE: this one is out of date with the new loader stuff...
-jclass
-_Jv_FindClassInCache (jstring name, java::lang::ClassLoader *loader)
+// This is used during initialization to register all compiled-in
+// classes that are not part of the core with the system class loader.
+void
+_Jv_CopyClassesToSystemLoader (gnu::gcj::runtime::SystemClassLoader *loader)
{
- JvSynchronize sync (&ClassClass);
- jint hash = name->hashCode();
- jclass klass = loaded_classes[(_Jv_ushort) hash % HASH_LEN];
- for ( ; klass; klass = klass->next)
+ for (jclass klass = system_class_list;
+ klass;
+ klass = klass->next_or_version)
{
- if (loader == klass->loader
- && _Jv_equal (klass->name, name, hash))
- break;
+ klass->loader = loader;
+ loader->addClass(klass);
}
- _Jv_MonitorExit (&ClassClass);
- return klass;
+ system_class_list = SYSTEM_LOADER_INITIALIZED;
}
-#endif
-jclass _Jv_FindClass (_Jv_Utf8Const *name,
- java::lang::ClassLoader *loader)
+// An internal variant of _Jv_FindClass which simply swallows a
+// NoClassDefFoundError or a ClassNotFoundException. This gives the
+// caller a chance to evaluate the situation and behave accordingly.
+jclass
+_Jv_FindClassNoException (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
{
- jclass klass = _Jv_FindClassInCache (name, loader);
+ jclass klass;
-#ifdef INTERPRETER
- if (! klass)
+ try
{
- jstring sname = _Jv_NewStringUTF (name->data);
-
- if (loader)
- {
- // Load using a user-defined loader, jvmspec 5.3.2
- klass = loader->loadClass(sname, false);
-
- // if "loader" delegateted the loadClass operation
- // to another loader, register explicitly
- // that he is also an initiating loader of the
- // given class.
-
- if (klass && (klass->getClassLoader () != loader))
- _Jv_RegisterInitiatingLoader (klass, 0);
- }
- else
- {
- if (redirect == NULL)
- {
- _Jv_InitClass (&ClassLoaderClass);
- java::lang::ClassLoader::getSystemClassLoader ();
- }
-
- // Load using the bootstrap loader jmspec 5.3.1
- klass = redirect -> loadClass (sname, false);
-
- // register that we're an initiating loader
- if (klass)
- {
- _Jv_RegisterInitiatingLoader (klass, 0);
- }
- }
+ klass = _Jv_FindClass(name, loader);
}
- else
+ catch ( java::lang::NoClassDefFoundError *ncdfe )
+ {
+ return NULL;
+ }
+ catch ( java::lang::ClassNotFoundException *cnfe )
{
- // we need classes to be in the hash while
- // we're loading, so that they can refer to themselves.
- _Jv_WaitForState (klass, JV_STATE_LOADED);
+ return NULL;
}
-#endif
return klass;
}
-#if 0
-// NOTE: this one is out of date with the new class loader stuff...
jclass
-_Jv_FindClass (jstring name, java::lang::ClassLoader *loader)
+_Jv_FindClass (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
{
- jclass klass = _Jv_FindClassInCache (name, loader);
+ // See if the class was already loaded by this loader. This handles
+ // initiating loader checks, as we register classes with their
+ // initiating loaders.
+
+ java::lang::ClassLoader *boot = java::lang::VMClassLoader::bootLoader;
+ java::lang::ClassLoader *real = loader;
+ if (! real)
+ real = boot;
+ jstring sname = name->toString();
+ // We might still be bootstrapping the VM, in which case there
+ // won't be a bootstrap class loader yet.
+ jclass klass = real ? real->findLoadedClass (sname) : NULL;
+
if (! klass)
{
if (loader)
{
- klass = loader->loadClass(name);
+ // Load using a user-defined loader, jvmspec 5.3.2.
+ // Note that we explicitly must call the single-argument form.
+ klass = loader->loadClass(sname);
+
+ // If "loader" delegated the loadClass operation to another
+ // loader, explicitly register that it is also an initiating
+ // loader of the given class.
+ java::lang::ClassLoader *delegate = (loader == boot
+ ? NULL
+ : loader);
+ if (klass && klass->getClassLoaderInternal () != delegate)
+ _Jv_RegisterInitiatingLoader (klass, loader);
}
- else
+ else if (boot)
{
- // jmspec 5.3.1.2
-
- // delegate to the system loader
- klass = java::lang::ClassLoader::system.loadClass (sname);
-
- // register that we're an initiating loader
+ // Load using the bootstrap loader jvmspec 5.3.1.
+ klass = java::lang::VMClassLoader::loadClass (sname, false);
+
+ // Register that we're an initiating loader.
if (klass)
_Jv_RegisterInitiatingLoader (klass, 0);
}
+ else
+ {
+ // Not even a bootstrap loader, try the built-in cache.
+ klass = _Jv_FindClassInCache (name);
+
+ if (klass)
+ {
+ bool found = false;
+ for (int i = 0; i < bootstrap_index; ++i)
+ {
+ if (bootstrap_class_list[i] == klass)
+ {
+ found = true;
+ break;
+ }
+ }
+ if (! found)
+ {
+ if (bootstrap_index == BOOTSTRAP_CLASS_LIST_SIZE)
+ abort ();
+ bootstrap_class_list[bootstrap_index++] = klass;
+ }
+ }
+ }
}
- else
- {
- _Jv_WaitForState (klass, JV_STATE_LOADED);
- }
-
+
return klass;
}
-#endif
+
+void
+_Jv_RegisterBootstrapPackages ()
+{
+ for (int i = 0; i < bootstrap_index; ++i)
+ java::lang::VMClassLoader::definePackageForNative(bootstrap_class_list[i]->getName());
+}
jclass
_Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
java::lang::ClassLoader *loader)
{
- jclass ret = (jclass) JvAllocObject (&ClassClass);
-
- ret->next = NULL;
+ jclass ret = (jclass) _Jv_AllocObject (&java::lang::Class::class$);
ret->name = name;
- ret->accflags = 0;
ret->superclass = superclass;
- ret->constants.size = 0;
- ret->constants.tags = NULL;
- ret->constants.data = NULL;
- ret->methods = NULL;
- ret->method_count = 0;
- ret->vtable_method_count = 0;
- ret->fields = NULL;
- ret->size_in_bytes = 0;
- ret->field_count = 0;
- ret->static_field_count = 0;
- ret->vtable = NULL;
- ret->interfaces = NULL;
ret->loader = loader;
- ret->interface_count = 0;
- ret->state = JV_STATE_NOTHING;
- ret->thread = NULL;
- _Jv_RegisterClass (ret);
+ _Jv_RegisterInitiatingLoader (ret, loader);
return ret;
}
-jclass
-_Jv_FindArrayClass (jclass element, java::lang::ClassLoader *loader)
+static _Jv_IDispatchTable *array_idt = NULL;
+static jshort array_depth = 0;
+static jclass *array_ancestors = NULL;
+
+static jclass interfaces[] =
{
+ &java::lang::Cloneable::class$,
+ &java::io::Serializable::class$
+};
+
+// Create a class representing an array of ELEMENT and store a pointer to it
+// in element->arrayclass. LOADER is the ClassLoader which _initiated_ the
+// instantiation of this array. ARRAY_VTABLE is the vtable to use for the new
+// array class. This parameter is optional.
+void
+_Jv_NewArrayClass (jclass element, java::lang::ClassLoader *loader,
+ _Jv_VTable *array_vtable)
+{
+ JvSynchronize sync (element);
+
_Jv_Utf8Const *array_name;
int len;
+
+ if (element->arrayclass)
+ return;
+
if (element->isPrimitive())
{
- // For primitive types the array is cached in the class.
- jclass ret = (jclass) element->methods;
- if (ret)
- return ret;
+ if (element == JvPrimClass (void))
+ throw new java::lang::ClassNotFoundException ();
len = 3;
}
else
- len = element->name->length + 5;
+ len = element->name->len() + 5;
{
char signature[len];
int index = 0;
signature[index++] = '[';
- // Compute name of array class to see if we've already cached it.
+ // Compute name of array class.
if (element->isPrimitive())
{
signature[index++] = (char) element->method_count;
}
else
{
- size_t length = element->name->length;
- const char *const name = element->name->data;
+ size_t length = element->name->len();
+ const char *const name = element->name->chars();
if (name[0] != '[')
signature[index++] = 'L';
memcpy (&signature[index], name, length);
array_name = _Jv_makeUtf8Const (signature, index);
}
- jclass array_class = _Jv_FindClassInCache (array_name, element->loader);
+ // Create new array class.
+ jclass array_class = _Jv_NewClass (array_name, &java::lang::Object::class$,
+ element->loader);
+
+ // Note that `vtable_method_count' doesn't include the initial
+ // gc_descr slot.
+ int dm_count = java::lang::Object::class$.vtable_method_count;
- if (! array_class)
+ // Create a new vtable by copying Object's vtable.
+ _Jv_VTable *vtable;
+ if (array_vtable)
+ vtable = array_vtable;
+ else
+ vtable = _Jv_VTable::new_vtable (dm_count);
+ vtable->clas = array_class;
+ vtable->gc_descr = java::lang::Object::class$.vtable->gc_descr;
+ for (int i = 0; i < dm_count; ++i)
+ vtable->set_method (i, java::lang::Object::class$.vtable->get_method (i));
+
+ array_class->vtable = vtable;
+ array_class->vtable_method_count
+ = java::lang::Object::class$.vtable_method_count;
+
+ // Stash the pointer to the element type.
+ array_class->element_type = element;
+
+ // Register our interfaces.
+ array_class->interfaces = interfaces;
+ array_class->interface_count = sizeof interfaces / sizeof interfaces[0];
+
+ // Since all array classes have the same interface dispatch table, we can
+ // cache one and reuse it. It is not necessary to synchronize this.
+ if (!array_idt)
{
- // Create new array class.
- array_class = _Jv_NewClass (array_name, &ObjectClass, element->loader);
-
- // Note that `vtable_method_count' doesn't include the initial
- // NULL slot.
- int dm_count = ObjectClass.vtable_method_count + 1;
-
- // Create a new vtable by copying Object's vtable (except the
- // class pointer, of course). Note that we allocate this as
- // unscanned memory -- the vtables are handled specially by the
- // GC.
- int size = (sizeof (_Jv_VTable) +
- ((dm_count - 1) * sizeof (void *)));
- _Jv_VTable *vtable = (_Jv_VTable *) _Jv_AllocBytes (size);
- vtable->clas = array_class;
- memcpy (vtable->method, ObjectClass.vtable->method,
- dm_count * sizeof (void *));
- array_class->vtable = vtable;
- array_class->vtable_method_count = ObjectClass.vtable_method_count;
-
- // Stash the pointer to the element type.
- array_class->methods = (_Jv_Method *) element;
-
- // Register our interfaces.
- // FIXME: for JDK 1.2 we need Serializable.
- static jclass interfaces[] = { &CloneableClass };
- array_class->interfaces = interfaces;
- array_class->interface_count = 1;
-
- // as per vmspec 5.3.3.2
- array_class->accflags = element->accflags;
-
- // FIXME: initialize other Class instance variables,
- // e.g. `fields'.
-
- // say this class is initialized and ready to go!
- array_class->state = JV_STATE_DONE;
-
- // vmspec, section 5.3.3 describes this
- if (element->loader != loader)
- _Jv_RegisterInitiatingLoader (array_class, loader);
+ _Jv_Linker::wait_for_state(array_class, JV_STATE_PREPARED);
+ array_idt = array_class->idt;
+ array_depth = array_class->depth;
+ array_ancestors = array_class->ancestors;
+ }
+ else
+ {
+ array_class->idt = array_idt;
+ array_class->depth = array_depth;
+ array_class->ancestors = array_ancestors;
}
- // For primitive types, point back at this array.
- if (element->isPrimitive())
- element->methods = (_Jv_Method *) array_class;
+ using namespace java::lang::reflect;
+ {
+ // Array classes are "abstract final" and inherit accessibility
+ // from element type, per vmspec 5.3.3.2
+ _Jv_ushort accflags = (Modifier::FINAL | Modifier::ABSTRACT
+ | (element->accflags
+ & (Modifier::PUBLIC | Modifier::PROTECTED
+ | Modifier::PRIVATE)));
+ array_class->accflags = accflags;
+ }
- return array_class;
+ // An array class has no visible instance fields. "length" is invisible to
+ // reflection.
+
+ // Say this class is initialized and ready to go!
+ array_class->state = JV_STATE_DONE;
+
+ // vmspec, section 5.3.3 describes this
+ if (element->loader != loader)
+ _Jv_RegisterInitiatingLoader (array_class, loader);
+
+ element->arrayclass = array_class;
}
+// These two functions form a stack of classes. When a class is loaded
+// it is pushed onto the stack by the class loader; this is so that
+// StackTrace can quickly determine which classes have been loaded.
+
+jclass
+_Jv_PopClass (void)
+{
+ JvSynchronize sync (&java::lang::Class::class$);
+ if (stack_head)
+ {
+ jclass tmp = stack_head;
+ stack_head = tmp->chain;
+ return tmp;
+ }
+ return NULL;
+}
+void
+_Jv_PushClass (jclass k)
+{
+ JvSynchronize sync (&java::lang::Class::class$);
+ jclass tmp = stack_head;
+ stack_head = k;
+ k->chain = tmp;
+}
OSDN Git Service
