+++ /dev/null
-// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
-
-/* Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation
-
- This file is part of libgcj.
-
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
-
-/* Author: Kresten Krab Thorup <krab@gnu.org> */
-
-#include <config.h>
-
-#include <stdlib.h>
-#include <string.h>
-
-#include <gcj/cni.h>
-#include <jvm.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/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>
-
-// FIXME: remove these.
-#define CloneableClass java::lang::Cloneable::class$
-#define ObjectClass java::lang::Object::class$
-#define ClassClass java::lang::Class::class$
-#define VMClassLoaderClass gnu::gcj::runtime::VMClassLoader::class$
-#define ClassLoaderClass java::lang::ClassLoader::class$
-#define SerializableClass java::io::Serializable::class$
-
-/////////// java.lang.ClassLoader native methods ////////////
-
-java::lang::Class *
-java::lang::ClassLoader::defineClass0 (jstring name,
- jbyteArray data,
- jint offset,
- jint length,
- java::security::ProtectionDomain *pd)
-{
-#ifdef INTERPRETER
- jclass klass;
- klass = (jclass) JvAllocObject (&ClassClass, sizeof (_Jv_InterpClass));
- _Jv_InitNewClassFields (klass);
-
- // synchronize on the class, so that it is not
- // attempted initialized until we're done loading.
- _Jv_MonitorEnter (klass);
-
- // record which is the defining loader
- klass->loader = this;
-
- // register that we are the initiating loader...
- if (name != 0)
- {
- _Jv_Utf8Const * name2 = _Jv_makeUtf8Const (name);
-
- if (! _Jv_VerifyClassName (name2))
- throw new java::lang::ClassFormatError
- (JvNewStringLatin1 ("erroneous class name"));
-
- klass->name = name2;
- }
-
- try
- {
- _Jv_DefineClass (klass, data, offset, length);
- }
- catch (java::lang::Throwable *ex)
- {
- 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.
-
- // FIXME: Rewrite this as a cleanup instead of
- // as a catch handler.
-
- throw ex;
- }
-
- klass->protectionDomain = pd;
-
- // if everything proceeded sucessfully, we're loaded.
- JvAssert (klass->state == JV_STATE_LOADED);
-
- // if an exception is generated, this is initially missed.
- // however, we come back here in handleException0 below...
- _Jv_MonitorExit (klass);
-
- return klass;
-
-#else // INTERPRETER
-
- return 0;
-#endif
-}
-
-void
-_Jv_WaitForState (jclass klass, int state)
-{
- if (klass->state >= state)
- return;
-
- _Jv_MonitorEnter (klass) ;
-
- if (state == JV_STATE_LINKED)
- {
- // Must call _Jv_PrepareCompiledClass while holding the class
- // mutex.
- _Jv_PrepareCompiledClass (klass);
- _Jv_MonitorExit (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);
-
- if (klass->state == JV_STATE_ERROR)
- throw new java::lang::LinkageError;
-}
-
-// Finish linking a class. Only called from ClassLoader::resolveClass.
-void
-java::lang::ClassLoader::linkClass0 (java::lang::Class *klass)
-{
- if (klass->state >= JV_STATE_LINKED)
- return;
-
-#ifdef INTERPRETER
- if (_Jv_IsInterpretedClass (klass))
- _Jv_PrepareClass (klass);
-#endif
-
- _Jv_PrepareCompiledClass (klass);
-}
-
-void
-java::lang::ClassLoader::markClassErrorState0 (java::lang::Class *klass)
-{
- klass->state = JV_STATE_ERROR;
- klass->notifyAll ();
-}
-
-jclass
-java::lang::VMClassLoader::getPrimitiveClass (jchar type)
-{
- char sig[2];
- sig[0] = (char) type;
- sig[1] = '\0';
- return _Jv_FindClassFromSignature (sig, NULL);
-}
-
-// This is the findClass() implementation for the System classloader. It is
-// the only native method in VMClassLoader, so we define it here.
-jclass
-gnu::gcj::runtime::VMClassLoader::findClass (jstring name)
-{
- _Jv_Utf8Const *name_u = _Jv_makeUtf8Const (name);
- jclass klass = _Jv_FindClassInCache (name_u, 0);
-
- if (! klass)
- {
- // Turn `gnu.pkg.quux' into `lib-gnu-pkg-quux'. Then search for
- // a module named (eg, on Linux) `lib-gnu-pkg-quux.so', followed
- // by `lib-gnu-pkg.so' and `lib-gnu.so'. If loading one of
- // these causes the class to appear in the cache, then use it.
- java::lang::StringBuffer *sb = new java::lang::StringBuffer (JvNewStringLatin1("lib-"));
- jstring so_base_name = (sb->append (name)->toString ())->replace ('.', '-');
-
- // Compare against `3' because that is the length of "lib".
- while (! klass && so_base_name && so_base_name->length() > 3)
- {
- using namespace ::java::lang;
- Runtime *rt = Runtime::getRuntime();
- jboolean loaded = rt->loadLibraryInternal (so_base_name);
-
- jint nd = so_base_name->lastIndexOf ('-');
- if (nd == -1)
- so_base_name = NULL;
- else
- so_base_name = so_base_name->substring (0, nd);
-
- if (loaded)
- klass = _Jv_FindClassInCache (name_u, 0);
- }
- }
-
- // Now try loading using the interpreter.
- if (! klass)
- {
- klass = java::net::URLClassLoader::findClass (name);
- }
-
- return klass;
-}
-
-jclass
-java::lang::ClassLoader::findLoadedClass (jstring name)
-{
- return _Jv_FindClassInCache (_Jv_makeUtf8Const (name), this);
-}
-
-/** 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.
- */
-void
-_Jv_PrepareCompiledClass (jclass klass)
-{
- if (klass->state >= JV_STATE_LINKED)
- return;
-
- // Short-circuit, so that mutually dependent classes are ok.
- klass->state = JV_STATE_LINKED;
-
- _Jv_Constants *pool = &klass->constants;
- for (int index = 1; index < pool->size; ++index)
- {
- 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);
- throw new java::lang::ClassNotFoundException (str);
- }
-
- 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;
- }
- }
-
-#ifdef INTERPRETER
- // FIXME: although the comment up top says that this function is
- // only called for compiled classes, it is actually called for every
- // class.
- if (! _Jv_IsInterpretedClass (klass))
- {
-#endif /* INTERPRETER */
- jfieldID f = JvGetFirstStaticField (klass);
- for (int n = JvNumStaticFields (klass); n > 0; --n)
- {
- int mod = f->getModifiers ();
- // If we have a static String field with a non-null initial
- // value, we know it points to a Utf8Const.
- if (f->getClass () == &StringClass
- && java::lang::reflect::Modifier::isStatic (mod))
- {
- jstring *strp = (jstring *) f->u.addr;
- if (*strp)
- *strp = _Jv_NewStringUtf8Const ((_Jv_Utf8Const *) *strp);
- }
- f = f->getNextField ();
- }
-#ifdef INTERPRETER
- }
-#endif /* INTERPRETER */
-
- if (klass->vtable == NULL)
- _Jv_MakeVTable(klass);
-
- if (klass->otable != NULL && klass->otable->state == 0)
- _Jv_LinkOffsetTable(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;
-};
-
-static _Jv_LoaderInfo *initiated_classes[HASH_LEN];
-static jclass loaded_classes[HASH_LEN];
-
-// This is the root of a linked list of classes
-
-\f
-
-jclass
-_Jv_FindClassInCache (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
-{
- _Jv_MonitorEnter (&ClassClass);
- jint hash = HASH_UTF (name);
-
- // 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;
- }
-
- // 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;
- }
- }
- }
-
- _Jv_MonitorExit (&ClassClass);
-
- return klass;
-}
-
-void
-_Jv_UnregisterClass (jclass the_class)
-{
- _Jv_MonitorEnter (&ClassClass);
- jint hash = HASH_UTF(the_class->name);
-
- jclass *klass = &(loaded_classes[hash]);
- for ( ; *klass; klass = &((*klass)->next))
- {
- if (*klass == the_class)
- {
- *klass = (*klass)->next;
- break;
- }
- }
-
- _Jv_LoaderInfo **info = &(initiated_classes[hash]);
- for ( ; ; info = &((*info)->next))
- {
- while (*info && (*info)->klass == the_class)
- {
- *info = (*info)->next;
- }
-
- if (*info == NULL)
- break;
- }
-
- _Jv_MonitorExit (&ClassClass);
-}
-
-void
-_Jv_RegisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
-{
- // non-gc alloc!
- _Jv_LoaderInfo *info = (_Jv_LoaderInfo *) _Jv_Malloc (sizeof(_Jv_LoaderInfo));
- 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);
-}
-
-// 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$.
-void
-_Jv_RegisterClasses (jclass *classes)
-{
- for (; *classes; ++classes)
- {
- jclass klass = *classes;
-
- (*_Jv_RegisterClassHook) (klass);
-
- // registering a compiled class causes
- // it to be immediately "prepared".
- if (klass->state == JV_STATE_NOTHING)
- klass->state = JV_STATE_COMPILED;
- }
-}
-
-void
-_Jv_RegisterClassHookDefault (jclass klass)
-{
- jint hash = HASH_UTF (klass->name);
-
- jclass check_class = loaded_classes[hash];
-
- // If the class is already registered, don't re-register it.
- while (check_class != NULL)
- {
- if (check_class == klass)
- {
- // If you get this, it means you have the same class in two
- // different libraries.
-#define TEXT "Duplicate class registration: "
- // We size-limit MESSAGE so that you can't trash the stack.
- char message[200];
- strcpy (message, TEXT);
- strncpy (message + sizeof (TEXT) - 1, klass->name->data,
- sizeof (message) - sizeof (TEXT));
- message[sizeof (message) - 1] = '\0';
- if (! gcj::runtimeInitialized)
- JvFail (message);
- else
- {
- java::lang::String *str = JvNewStringLatin1 (message);
- throw new java::lang::VirtualMachineError (str);
- }
- }
-
- check_class = check_class->next;
- }
-
- klass->next = loaded_classes[hash];
- loaded_classes[hash] = klass;
-}
-
-// A pointer to a function that actually registers a class.
-// Normally _Jv_RegisterClassHookDefault, but could be some other function
-// that registers the class in e.g. a ClassLoader-local table.
-// Should synchronize on Class:class$ while setting/restore this variable.
-
-void (*_Jv_RegisterClassHook) (jclass cl) = _Jv_RegisterClassHookDefault;
-
-void
-_Jv_RegisterClass (jclass klass)
-{
- jclass classes[2];
- classes[0] = klass;
- classes[1] = NULL;
- _Jv_RegisterClasses (classes);
-}
-
-jclass
-_Jv_FindClass (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
-{
- jclass klass = _Jv_FindClassInCache (name, loader);
-
- if (! klass)
- {
- 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" delegated the loadClass operation to another
- // loader, explicitly register that it is also an initiating
- // loader of the given class.
- if (klass && (klass->getClassLoader () != loader))
- _Jv_RegisterInitiatingLoader (klass, loader);
- }
- else
- {
- java::lang::ClassLoader *sys
- = java::lang::ClassLoader::getSystemClassLoader ();
-
- // Load using the bootstrap loader jvmspec 5.3.1.
- klass = sys->loadClass (sname, false);
-
- // Register that we're an initiating loader.
- if (klass)
- _Jv_RegisterInitiatingLoader (klass, 0);
- }
- }
- else
- {
- // 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 klass;
-}
-
-void
-_Jv_InitNewClassFields (jclass ret)
-{
- ret->next = NULL;
- ret->name = NULL;
- ret->accflags = 0;
- ret->superclass = NULL;
- 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 = NULL;
- ret->interface_count = 0;
- ret->state = JV_STATE_NOTHING;
- ret->thread = NULL;
- ret->depth = 0;
- ret->ancestors = NULL;
- ret->idt = NULL;
- ret->arrayclass = NULL;
-}
-
-jclass
-_Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
- java::lang::ClassLoader *loader)
-{
- jclass ret = (jclass) JvAllocObject (&ClassClass);
- _Jv_InitNewClassFields (ret);
- ret->name = name;
- ret->superclass = superclass;
- ret->loader = loader;
-
- _Jv_RegisterClass (ret);
-
- return ret;
-}
-
-static _Jv_IDispatchTable *array_idt = NULL;
-static jshort array_depth = 0;
-static jclass *array_ancestors = NULL;
-
-// 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())
- {
- if (element == JvPrimClass (void))
- throw new java::lang::ClassNotFoundException ();
- len = 3;
- }
- else
- len = element->name->length + 5;
-
- {
- char signature[len];
- int index = 0;
- signature[index++] = '[';
- // 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;
- if (name[0] != '[')
- signature[index++] = 'L';
- memcpy (&signature[index], name, length);
- index += length;
- if (name[0] != '[')
- signature[index++] = ';';
- }
- array_name = _Jv_makeUtf8Const (signature, index);
- }
-
- // Create new array class.
- jclass array_class = _Jv_NewClass (array_name, &ObjectClass,
- element->loader);
-
- // Note that `vtable_method_count' doesn't include the initial
- // gc_descr slot.
- JvAssert (ObjectClass.vtable_method_count == NUM_OBJECT_METHODS);
- int dm_count = ObjectClass.vtable_method_count;
-
- // 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 = ObjectClass.vtable->gc_descr;
- for (int i = 0; i < dm_count; ++i)
- vtable->set_method (i, ObjectClass.vtable->get_method (i));
-
- 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.
- static jclass interfaces[] = { &CloneableClass, &SerializableClass };
- 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)
- {
- _Jv_PrepareConstantTimeTables (array_class);
- 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;
- }
-
- using namespace java::lang::reflect;
- {
- // Array classes are "abstract final"...
- _Jv_ushort accflags = Modifier::FINAL | Modifier::ABSTRACT;
- // ... and inherit accessibility from element type, per vmspec 5.3.3.2
- accflags |= (element->accflags & Modifier::PUBLIC);
- accflags |= (element->accflags & Modifier::PROTECTED);
- accflags |= (element->accflags & Modifier::PRIVATE);
- array_class->accflags = accflags;
- }
-
- // 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;
-}
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