mirror of
https://github.com/autc04/Retro68.git
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735 lines
21 KiB
C++
735 lines
21 KiB
C++
// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
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/* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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/* Author: Kresten Krab Thorup <krab@gnu.org> */
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#include <config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <execution.h>
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#include <java-threads.h>
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#include <java-interp.h>
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#include <java/lang/Character.h>
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#include <java/lang/Thread.h>
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#include <java/lang/ClassLoader.h>
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#include <java/lang/InternalError.h>
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#include <java/lang/IllegalAccessError.h>
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#include <java/lang/LinkageError.h>
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#include <java/lang/NoClassDefFoundError.h>
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#include <java/lang/ClassNotFoundException.h>
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#include <java/lang/ClassCircularityError.h>
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#include <java/lang/IncompatibleClassChangeError.h>
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#include <java/lang/ClassFormatError.h>
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#include <java/lang/VirtualMachineError.h>
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#include <java/lang/VMClassLoader.h>
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#include <java/lang/reflect/Modifier.h>
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#include <java/lang/Runtime.h>
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#include <java/lang/StringBuffer.h>
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#include <java/io/Serializable.h>
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#include <java/lang/Cloneable.h>
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#include <java/lang/ref/WeakReference.h>
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#include <java/util/HashMap.h>
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#include <gnu/gcj/runtime/BootClassLoader.h>
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#include <gnu/gcj/runtime/SystemClassLoader.h>
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// Size of local hash table.
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#define HASH_LEN 1013
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// Hash function for Utf8Consts.
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#define HASH_UTF(Utf) ((Utf)->hash16() % HASH_LEN)
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// This records classes which will be registered with the system class
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// loader when it is initialized.
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static jclass system_class_list;
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// This is used as the value of system_class_list after we have
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// initialized the system class loader; it lets us know that we should
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// no longer pay attention to the system abi flag.
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#define SYSTEM_LOADER_INITIALIZED ((jclass) -1)
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static jclass loaded_classes[HASH_LEN];
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// This is the root of a linked list of classes
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static jclass stack_head;
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// While bootstrapping we keep a list of classes we found, so that we
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// can register their packages. There aren't many of these so we
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// just keep a small buffer here and abort if we overflow.
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#define BOOTSTRAP_CLASS_LIST_SIZE 20
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static jclass bootstrap_class_list[BOOTSTRAP_CLASS_LIST_SIZE];
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static int bootstrap_index;
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jclass
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java::lang::ClassLoader::loadClassFromSig(jstring name)
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{
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int len = _Jv_GetStringUTFLength (name);
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char sig[len + 1];
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_Jv_GetStringUTFRegion (name, 0, name->length(), sig);
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jclass result = _Jv_FindClassFromSignature(sig, this);
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if (result == NULL)
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throw new ClassNotFoundException(name);
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return result;
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}
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// This tries to find a class in our built-in cache. This cache is
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// used only for classes which are linked in to the executable or
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// loaded via dlopen().
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jclass
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_Jv_FindClassInCache (_Jv_Utf8Const *name)
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{
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JvSynchronize sync (&java::lang::Class::class$);
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jint hash = HASH_UTF (name);
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jclass klass;
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for (klass = loaded_classes[hash]; klass; klass = klass->next_or_version)
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{
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if (_Jv_equalUtf8Consts (name, klass->name))
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break;
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}
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return klass;
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}
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void
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_Jv_UnregisterClass (jclass the_class)
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{
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// This can happen if the class could not be defined properly.
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if (! the_class->name)
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return;
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JvSynchronize sync (&java::lang::Class::class$);
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jint hash = HASH_UTF(the_class->name);
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jclass *klass = &(loaded_classes[hash]);
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for ( ; *klass; klass = &((*klass)->next_or_version))
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{
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if (*klass == the_class)
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{
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*klass = (*klass)->next_or_version;
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break;
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}
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}
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}
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// Register an initiating class loader for a given class.
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void
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_Jv_RegisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
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{
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if (! loader)
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loader = java::lang::VMClassLoader::bootLoader;
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if (! loader)
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{
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// Very early in the bootstrap process, the Bootstrap classloader may
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// not exist yet.
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// FIXME: We could maintain a list of these and come back and register
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// them later.
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return;
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}
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JvSynchronize sync (loader->loadingConstraints);
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using namespace java::lang::ref;
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jstring name = klass->getName();
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WeakReference *ref = (WeakReference *) loader->loadingConstraints->get (name);
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if (ref)
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{
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jclass constraint = (jclass) ref->get();
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if (constraint && constraint != klass)
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throw new java::lang::LinkageError(JvNewStringLatin1("loading constraint violated"));
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}
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loader->loadingConstraints->put(name, new WeakReference(klass));
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loader->loadedClasses->put(name, klass);
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}
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// If we found an error while defining an interpreted class, we must
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// go back and unregister it.
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void
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_Jv_UnregisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
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{
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if (! loader)
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loader = java::lang::VMClassLoader::bootLoader;
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loader->loadedClasses->remove(klass->name->toString());
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}
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// Check a loading constraint. In particular check that, if there is
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// a constraint for the name of KLASS in LOADER, that it maps to
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// KLASS. If there is no such constraint, make a new one. If the
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// constraint is violated, throw an exception. Do nothing for
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// primitive types.
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void
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_Jv_CheckOrCreateLoadingConstraint (jclass klass,
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java::lang::ClassLoader *loader)
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{
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// Strip arrays.
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while (klass->isArray())
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klass = klass->getComponentType();
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// Ignore primitive types.
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if (klass->isPrimitive())
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return;
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if (! loader)
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loader = java::lang::VMClassLoader::bootLoader;
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jstring name = klass->getName();
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JvSynchronize sync (loader->loadingConstraints);
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using namespace java::lang::ref;
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WeakReference *ref = (WeakReference *) loader->loadingConstraints->get (name);
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if (ref)
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{
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jclass constraint = (jclass) ref->get();
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if (constraint)
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{
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if (klass != constraint)
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throw new java::lang::LinkageError(JvNewStringLatin1("loading constraint violated"));
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// Otherwise, all is ok.
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return;
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}
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}
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// No constraint (or old constraint GC'd). Make a new one.
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loader->loadingConstraints->put(name, new WeakReference(klass));
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}
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// Class registration.
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//
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// There are two kinds of functions that register classes.
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//
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// Type 1:
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//
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// These take the address of a class that is in an object file.
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// Because these classes are not allocated on the heap, It is also
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// necessary to register the address of the object for garbage
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// collection. This is used with the "old" C++ ABI and with
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// -findirect-dispatch -fno-indirect-classes.
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//
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// Type 2:
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//
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// These take an initializer struct, create the class, and return the
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// address of the newly created class to their caller. These are used
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// with -findirect-dispatch.
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//
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// _Jv_RegisterClasses() and _Jv_RegisterClasses_Counted() are
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// functions of Type 1, and _Jv_NewClassFromInitializer() and
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// _Jv_RegisterNewClasses() are of Type 2.
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// Check that the file we're trying to load has been compiled with a
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// compatible version of gcj. In previous versions of libgcj we
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// silently failed to register classes of an incompatible ABI version,
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// but this was totally bogus.
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void
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_Jv_CheckABIVersion (unsigned long value)
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{
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// We are compatible with GCJ 4.0.0 BC-ABI classes. This release used a
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// different format for the version ID string.
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if (value == OLD_GCJ_40_BC_ABI_VERSION)
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return;
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// The 20 low-end bits are used for the version number.
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unsigned long version = value & 0xfffff;
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if (value & FLAG_BINARYCOMPAT_ABI)
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{
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int abi_rev = version % 100;
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int abi_ver = version - abi_rev;
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// We are compatible with abi_rev 0 and 1.
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if (abi_ver == GCJ_40_BC_ABI_VERSION && abi_rev <= 1)
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return;
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}
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else
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{
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// C++ ABI
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if (version == GCJ_CXX_ABI_VERSION)
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return;
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// If we've loaded a library that uses the C++ ABI, and this
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// library is an incompatible version, then we're dead. There's
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// no point throwing an exception: that will crash.
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JvFail ("gcj linkage error.\n"
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"Incorrect library ABI version detected. Aborting.\n");
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}
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throw new ::java::lang::ClassFormatError
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(JvNewStringLatin1 ("Library compiled with later ABI version than"
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" this version of libgcj supports"));
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}
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// This function is called many times during startup, before main() is
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// run. At that point in time we know for certain we are running
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// single-threaded, so we don't need to lock when adding classes to the
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// class chain. At all other times, the caller should synchronize on
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// Class::class$.
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void
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_Jv_RegisterClasses (const jclass *classes)
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{
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_Jv_RegisterLibForGc (classes);
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for (; *classes; ++classes)
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{
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jclass klass = *classes;
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_Jv_CheckABIVersion ((unsigned long) klass->next_or_version);
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(*_Jv_RegisterClassHook) (klass);
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}
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}
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// This is a version of _Jv_RegisterClasses that takes a count.
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void
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_Jv_RegisterClasses_Counted (const jclass * classes, size_t count)
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{
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size_t i;
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_Jv_RegisterLibForGc (classes);
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for (i = 0; i < count; i++)
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{
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jclass klass = classes[i];
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_Jv_CheckABIVersion ((unsigned long) klass->next_or_version);
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(*_Jv_RegisterClassHook) (klass);
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}
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}
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// Create a class on the heap from an initializer struct.
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inline jclass
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_Jv_NewClassFromInitializer (const char *class_initializer)
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{
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const unsigned long version
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= ((unsigned long)
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((::java::lang::Class *)class_initializer)->next_or_version);
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_Jv_CheckABIVersion (version);
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/* We create an instance of java::lang::Class and copy all of its
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fields except the first word (the vtable pointer) from
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CLASS_INITIALIZER. This first word is pre-initialized by
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_Jv_AllocObj, and we don't want to overwrite it. */
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jclass new_class
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= (jclass)_Jv_AllocObj (sizeof (::java::lang::Class),
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&::java::lang::Class::class$);
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const char *src = class_initializer + sizeof (void*);
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char *dst = (char*)new_class + sizeof (void*);
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size_t len = (::java::lang::Class::initializerSize (version)
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- sizeof (void*));
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memcpy (dst, src, len);
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new_class->engine = &_Jv_soleIndirectCompiledEngine;
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/* FIXME: Way back before the dawn of time, we overloaded the
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SYNTHETIC class access modifier to mean INTERPRETED. This was a
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Bad Thing, but it didn't matter then because classes were never
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marked synthetic. However, it is possible to redeem the
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situation: _Jv_NewClassFromInitializer is only called from
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compiled classes, so we clear the INTERPRETED flag. This is a
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kludge! */
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new_class->accflags &= ~java::lang::reflect::Modifier::INTERPRETED;
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(*_Jv_RegisterClassHook) (new_class);
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return new_class;
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}
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// Called by compiler-generated code at DSO initialization. CLASSES
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// is an array of pairs: the first item of each pair is a pointer to
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// the initialized data that is a class initializer in a DSO, and the
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// second is a pointer to a class reference.
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// _Jv_NewClassFromInitializer() creates the new class (on the Java
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// heap) and we write the address of the new class into the address
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// pointed to by the second word.
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void
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_Jv_RegisterNewClasses (char **classes)
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{
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_Jv_InitGC ();
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const char *initializer;
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while ((initializer = *classes++))
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{
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jclass *class_ptr = (jclass *)*classes++;
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*class_ptr = _Jv_NewClassFromInitializer (initializer);
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}
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}
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void
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_Jv_RegisterClassHookDefault (jclass klass)
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{
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// This is bogus, but there doesn't seem to be a better place to do
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// it.
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if (! klass->engine)
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klass->engine = &_Jv_soleCompiledEngine;
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/* FIXME: Way back before the dawn of time, we overloaded the
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SYNTHETIC class access modifier to mean INTERPRETED. This was a
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Bad Thing, but it didn't matter then because classes were never
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marked synthetic. However, it is possible to redeem the
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situation: _Jv_RegisterClassHookDefault is only called from
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compiled classes, so we clear the INTERPRETED flag. This is a
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kludge! */
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klass->accflags &= ~java::lang::reflect::Modifier::INTERPRETED;
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if (system_class_list != SYSTEM_LOADER_INITIALIZED)
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{
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unsigned long abi = (unsigned long) klass->next_or_version;
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if (! _Jv_ClassForBootstrapLoader (abi))
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{
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klass->next_or_version = system_class_list;
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system_class_list = klass;
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return;
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}
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}
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jint hash = HASH_UTF (klass->name);
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// If the class is already registered, don't re-register it.
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for (jclass check_class = loaded_classes[hash];
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check_class != NULL;
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check_class = check_class->next_or_version)
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{
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if (check_class == klass)
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{
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// If you get this, it means you have the same class in two
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// different libraries.
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#define TEXT "Duplicate class registration: "
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// We size-limit MESSAGE so that you can't trash the stack.
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char message[200];
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strcpy (message, TEXT);
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strncpy (message + sizeof (TEXT) - 1, klass->name->chars(),
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sizeof (message) - sizeof (TEXT));
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message[sizeof (message) - 1] = '\0';
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if (! gcj::runtimeInitialized)
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JvFail (message);
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else
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{
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java::lang::String *str = JvNewStringLatin1 (message);
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throw new java::lang::VirtualMachineError (str);
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}
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}
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}
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klass->next_or_version = loaded_classes[hash];
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loaded_classes[hash] = klass;
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}
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// A pointer to a function that actually registers a class.
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// Normally _Jv_RegisterClassHookDefault, but could be some other function
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// that registers the class in e.g. a ClassLoader-local table.
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// Should synchronize on Class:class$ while setting/restore this variable.
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void (*_Jv_RegisterClassHook) (jclass cl) = _Jv_RegisterClassHookDefault;
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void
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_Jv_RegisterClass (jclass klass)
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{
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jclass classes[2];
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classes[0] = klass;
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classes[1] = NULL;
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_Jv_RegisterClasses (classes);
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}
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// This is used during initialization to register all compiled-in
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// classes that are not part of the core with the system class loader.
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void
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_Jv_CopyClassesToSystemLoader (gnu::gcj::runtime::SystemClassLoader *loader)
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{
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for (jclass klass = system_class_list;
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klass;
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klass = klass->next_or_version)
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{
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klass->loader = loader;
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loader->addClass(klass);
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}
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system_class_list = SYSTEM_LOADER_INITIALIZED;
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}
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// An internal variant of _Jv_FindClass which simply swallows a
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// NoClassDefFoundError or a ClassNotFoundException. This gives the
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// caller a chance to evaluate the situation and behave accordingly.
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jclass
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_Jv_FindClassNoException (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
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{
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jclass klass;
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try
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{
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klass = _Jv_FindClass(name, loader);
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}
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catch ( java::lang::NoClassDefFoundError *ncdfe )
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{
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return NULL;
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}
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catch ( java::lang::ClassNotFoundException *cnfe )
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{
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return NULL;
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}
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return klass;
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}
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jclass
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_Jv_FindClass (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
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{
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// See if the class was already loaded by this loader. This handles
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// initiating loader checks, as we register classes with their
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// initiating loaders.
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java::lang::ClassLoader *boot = java::lang::VMClassLoader::bootLoader;
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java::lang::ClassLoader *real = loader;
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if (! real)
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real = boot;
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jstring sname = name->toString();
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// We might still be bootstrapping the VM, in which case there
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// won't be a bootstrap class loader yet.
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jclass klass = real ? real->findLoadedClass (sname) : NULL;
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if (! klass)
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{
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if (loader)
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{
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// Load using a user-defined loader, jvmspec 5.3.2.
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// Note that we explicitly must call the single-argument form.
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klass = loader->loadClass(sname);
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// If "loader" delegated the loadClass operation to another
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// loader, explicitly register that it is also an initiating
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// loader of the given class.
|
||
java::lang::ClassLoader *delegate = (loader == boot
|
||
? NULL
|
||
: loader);
|
||
if (klass && klass->getClassLoaderInternal () != delegate)
|
||
_Jv_RegisterInitiatingLoader (klass, loader);
|
||
}
|
||
else if (boot)
|
||
{
|
||
// 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;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return klass;
|
||
}
|
||
|
||
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) _Jv_AllocObject (&java::lang::Class::class$);
|
||
ret->name = name;
|
||
ret->superclass = superclass;
|
||
ret->loader = loader;
|
||
|
||
_Jv_RegisterInitiatingLoader (ret, loader);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static _Jv_IDispatchTable *array_idt = NULL;
|
||
static jshort array_depth = 0;
|
||
static jclass *array_ancestors = NULL;
|
||
|
||
static jclass interfaces[] =
|
||
{
|
||
&java::lang::Cloneable::class$,
|
||
&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())
|
||
{
|
||
if (element == JvPrimClass (void))
|
||
throw new java::lang::ClassNotFoundException ();
|
||
len = 3;
|
||
}
|
||
else
|
||
len = element->name->len() + 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->len();
|
||
const char *const name = element->name->chars();
|
||
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, &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;
|
||
|
||
// 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$.vtable_method_count;
|
||
|
||
// Stash the pointer to the element type.
|
||
array_class->element_type = element;
|
||
|
||
// Register our interfaces.
|
||
array_class->interfaces = interfaces;
|
||
array_class->interface_count = sizeof interfaces / sizeof interfaces[0];
|
||
|
||
// Since all array classes have the same interface dispatch table, we can
|
||
// cache one and reuse it. It is not necessary to synchronize this.
|
||
if (!array_idt)
|
||
{
|
||
_Jv_Linker::wait_for_state(array_class, JV_STATE_PREPARED);
|
||
array_idt = array_class->idt;
|
||
array_depth = array_class->depth;
|
||
array_ancestors = array_class->ancestors;
|
||
}
|
||
else
|
||
{
|
||
array_class->idt = array_idt;
|
||
array_class->depth = array_depth;
|
||
array_class->ancestors = array_ancestors;
|
||
}
|
||
|
||
using namespace java::lang::reflect;
|
||
{
|
||
// Array classes are "abstract final" and inherit accessibility
|
||
// from element type, per vmspec 5.3.3.2
|
||
_Jv_ushort accflags = (Modifier::FINAL | Modifier::ABSTRACT
|
||
| (element->accflags
|
||
& (Modifier::PUBLIC | Modifier::PROTECTED
|
||
| Modifier::PRIVATE)));
|
||
array_class->accflags = accflags;
|
||
}
|
||
|
||
// An array class has no visible instance fields. "length" is invisible to
|
||
// reflection.
|
||
|
||
// Say this class is initialized and ready to go!
|
||
array_class->state = JV_STATE_DONE;
|
||
|
||
// vmspec, section 5.3.3 describes this
|
||
if (element->loader != loader)
|
||
_Jv_RegisterInitiatingLoader (array_class, loader);
|
||
|
||
element->arrayclass = array_class;
|
||
}
|
||
|
||
// These two functions form a stack of classes. When a class is loaded
|
||
// it is pushed onto the stack by the class loader; this is so that
|
||
// StackTrace can quickly determine which classes have been loaded.
|
||
|
||
jclass
|
||
_Jv_PopClass (void)
|
||
{
|
||
JvSynchronize sync (&java::lang::Class::class$);
|
||
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;
|
||
}
|