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jlechner |
// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
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/* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 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/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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static jclass loaded_classes[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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// 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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loader->loadedClasses->put(klass->name->toString(), 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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// 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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for (; *classes; ++classes)
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{
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jclass klass = *classes;
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if (_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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for (i = 0; i < count; i++)
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{
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jclass klass = classes[i];
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if (_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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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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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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262 |
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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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271 |
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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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275 |
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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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280 |
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java::lang::ClassLoader *real = loader;
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281 |
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if (! real)
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real = boot;
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283 |
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jstring sname = name->toString();
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284 |
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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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287 |
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288 |
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if (! klass)
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{
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290 |
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if (loader)
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291 |
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{
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292 |
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// Load using a user-defined loader, jvmspec 5.3.2.
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293 |
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// Note that we explicitly must call the single-argument form.
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294 |
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klass = loader->loadClass(sname);
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295 |
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296 |
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// If "loader" delegated the loadClass operation to another
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297 |
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// loader, explicitly register that it is also an initiating
|
298 |
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// loader of the given class.
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299 |
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java::lang::ClassLoader *delegate = (loader == boot
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300 |
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? NULL
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301 |
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: loader);
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302 |
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if (klass && klass->getClassLoaderInternal () != delegate)
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_Jv_RegisterInitiatingLoader (klass, loader);
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304 |
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}
|
305 |
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else if (boot)
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306 |
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{
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307 |
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// Load using the bootstrap loader jvmspec 5.3.1.
|
308 |
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klass = java::lang::VMClassLoader::loadClass (sname, false);
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309 |
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310 |
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// Register that we're an initiating loader.
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311 |
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if (klass)
|
312 |
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_Jv_RegisterInitiatingLoader (klass, 0);
|
313 |
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}
|
314 |
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else
|
315 |
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{
|
316 |
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// Not even a bootstrap loader, try the built-in cache.
|
317 |
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klass = _Jv_FindClassInCache (name);
|
318 |
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|
319 |
|
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if (klass)
|
320 |
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{
|
321 |
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bool found = false;
|
322 |
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for (int i = 0; i < bootstrap_index; ++i)
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323 |
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{
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324 |
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if (bootstrap_class_list[i] == klass)
|
325 |
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{
|
326 |
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found = true;
|
327 |
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break;
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328 |
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}
|
329 |
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}
|
330 |
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if (! found)
|
331 |
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{
|
332 |
|
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if (bootstrap_index == BOOTSTRAP_CLASS_LIST_SIZE)
|
333 |
|
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abort ();
|
334 |
|
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bootstrap_class_list[bootstrap_index++] = klass;
|
335 |
|
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}
|
336 |
|
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}
|
337 |
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}
|
338 |
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}
|
339 |
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|
340 |
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return klass;
|
341 |
|
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}
|
342 |
|
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|
343 |
|
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void
|
344 |
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_Jv_RegisterBootstrapPackages ()
|
345 |
|
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{
|
346 |
|
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for (int i = 0; i < bootstrap_index; ++i)
|
347 |
|
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java::lang::VMClassLoader::definePackageForNative(bootstrap_class_list[i]->getName());
|
348 |
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}
|
349 |
|
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|
350 |
|
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jclass
|
351 |
|
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_Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
|
352 |
|
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java::lang::ClassLoader *loader)
|
353 |
|
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{
|
354 |
|
|
jclass ret = (jclass) _Jv_AllocObject (&java::lang::Class::class$);
|
355 |
|
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ret->name = name;
|
356 |
|
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ret->superclass = superclass;
|
357 |
|
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ret->loader = loader;
|
358 |
|
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|
359 |
|
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_Jv_RegisterInitiatingLoader (ret, loader);
|
360 |
|
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|
361 |
|
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return ret;
|
362 |
|
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}
|
363 |
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|
364 |
|
|
static _Jv_IDispatchTable *array_idt = NULL;
|
365 |
|
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static jshort array_depth = 0;
|
366 |
|
|
static jclass *array_ancestors = NULL;
|
367 |
|
|
|
368 |
|
|
// Create a class representing an array of ELEMENT and store a pointer to it
|
369 |
|
|
// in element->arrayclass. LOADER is the ClassLoader which _initiated_ the
|
370 |
|
|
// instantiation of this array. ARRAY_VTABLE is the vtable to use for the new
|
371 |
|
|
// array class. This parameter is optional.
|
372 |
|
|
void
|
373 |
|
|
_Jv_NewArrayClass (jclass element, java::lang::ClassLoader *loader,
|
374 |
|
|
_Jv_VTable *array_vtable)
|
375 |
|
|
{
|
376 |
|
|
JvSynchronize sync (element);
|
377 |
|
|
|
378 |
|
|
_Jv_Utf8Const *array_name;
|
379 |
|
|
int len;
|
380 |
|
|
|
381 |
|
|
if (element->arrayclass)
|
382 |
|
|
return;
|
383 |
|
|
|
384 |
|
|
if (element->isPrimitive())
|
385 |
|
|
{
|
386 |
|
|
if (element == JvPrimClass (void))
|
387 |
|
|
throw new java::lang::ClassNotFoundException ();
|
388 |
|
|
len = 3;
|
389 |
|
|
}
|
390 |
|
|
else
|
391 |
|
|
len = element->name->len() + 5;
|
392 |
|
|
|
393 |
|
|
{
|
394 |
|
|
char signature[len];
|
395 |
|
|
int index = 0;
|
396 |
|
|
signature[index++] = '[';
|
397 |
|
|
// Compute name of array class.
|
398 |
|
|
if (element->isPrimitive())
|
399 |
|
|
{
|
400 |
|
|
signature[index++] = (char) element->method_count;
|
401 |
|
|
}
|
402 |
|
|
else
|
403 |
|
|
{
|
404 |
|
|
size_t length = element->name->len();
|
405 |
|
|
const char *const name = element->name->chars();
|
406 |
|
|
if (name[0] != '[')
|
407 |
|
|
signature[index++] = 'L';
|
408 |
|
|
memcpy (&signature[index], name, length);
|
409 |
|
|
index += length;
|
410 |
|
|
if (name[0] != '[')
|
411 |
|
|
signature[index++] = ';';
|
412 |
|
|
}
|
413 |
|
|
array_name = _Jv_makeUtf8Const (signature, index);
|
414 |
|
|
}
|
415 |
|
|
|
416 |
|
|
// Create new array class.
|
417 |
|
|
jclass array_class = _Jv_NewClass (array_name, &java::lang::Object::class$,
|
418 |
|
|
element->loader);
|
419 |
|
|
|
420 |
|
|
// Note that `vtable_method_count' doesn't include the initial
|
421 |
|
|
// gc_descr slot.
|
422 |
|
|
int dm_count = java::lang::Object::class$.vtable_method_count;
|
423 |
|
|
|
424 |
|
|
// Create a new vtable by copying Object's vtable.
|
425 |
|
|
_Jv_VTable *vtable;
|
426 |
|
|
if (array_vtable)
|
427 |
|
|
vtable = array_vtable;
|
428 |
|
|
else
|
429 |
|
|
vtable = _Jv_VTable::new_vtable (dm_count);
|
430 |
|
|
vtable->clas = array_class;
|
431 |
|
|
vtable->gc_descr = java::lang::Object::class$.vtable->gc_descr;
|
432 |
|
|
for (int i = 0; i < dm_count; ++i)
|
433 |
|
|
vtable->set_method (i, java::lang::Object::class$.vtable->get_method (i));
|
434 |
|
|
|
435 |
|
|
array_class->vtable = vtable;
|
436 |
|
|
array_class->vtable_method_count
|
437 |
|
|
= java::lang::Object::class$.vtable_method_count;
|
438 |
|
|
|
439 |
|
|
// Stash the pointer to the element type.
|
440 |
|
|
array_class->methods = (_Jv_Method *) element;
|
441 |
|
|
|
442 |
|
|
// Register our interfaces.
|
443 |
|
|
static jclass interfaces[] =
|
444 |
|
|
{
|
445 |
|
|
&java::lang::Cloneable::class$,
|
446 |
|
|
&java::io::Serializable::class$
|
447 |
|
|
};
|
448 |
|
|
array_class->interfaces = interfaces;
|
449 |
|
|
array_class->interface_count = sizeof interfaces / sizeof interfaces[0];
|
450 |
|
|
|
451 |
|
|
// Since all array classes have the same interface dispatch table, we can
|
452 |
|
|
// cache one and reuse it. It is not necessary to synchronize this.
|
453 |
|
|
if (!array_idt)
|
454 |
|
|
{
|
455 |
|
|
_Jv_Linker::wait_for_state(array_class, JV_STATE_PREPARED);
|
456 |
|
|
array_idt = array_class->idt;
|
457 |
|
|
array_depth = array_class->depth;
|
458 |
|
|
array_ancestors = array_class->ancestors;
|
459 |
|
|
}
|
460 |
|
|
else
|
461 |
|
|
{
|
462 |
|
|
array_class->idt = array_idt;
|
463 |
|
|
array_class->depth = array_depth;
|
464 |
|
|
array_class->ancestors = array_ancestors;
|
465 |
|
|
}
|
466 |
|
|
|
467 |
|
|
using namespace java::lang::reflect;
|
468 |
|
|
{
|
469 |
|
|
// Array classes are "abstract final" and inherit accessibility
|
470 |
|
|
// from element type, per vmspec 5.3.3.2
|
471 |
|
|
_Jv_ushort accflags = (Modifier::FINAL | Modifier::ABSTRACT
|
472 |
|
|
| (element->accflags
|
473 |
|
|
& (Modifier::PUBLIC | Modifier::PROTECTED
|
474 |
|
|
| Modifier::PRIVATE)));
|
475 |
|
|
array_class->accflags = accflags;
|
476 |
|
|
}
|
477 |
|
|
|
478 |
|
|
// An array class has no visible instance fields. "length" is invisible to
|
479 |
|
|
// reflection.
|
480 |
|
|
|
481 |
|
|
// Say this class is initialized and ready to go!
|
482 |
|
|
array_class->state = JV_STATE_DONE;
|
483 |
|
|
|
484 |
|
|
// vmspec, section 5.3.3 describes this
|
485 |
|
|
if (element->loader != loader)
|
486 |
|
|
_Jv_RegisterInitiatingLoader (array_class, loader);
|
487 |
|
|
|
488 |
|
|
element->arrayclass = array_class;
|
489 |
|
|
}
|
490 |
|
|
|
491 |
|
|
// These two functions form a stack of classes. When a class is loaded
|
492 |
|
|
// it is pushed onto the stack by the class loader; this is so that
|
493 |
|
|
// StackTrace can quickly determine which classes have been loaded.
|
494 |
|
|
|
495 |
|
|
jclass
|
496 |
|
|
_Jv_PopClass (void)
|
497 |
|
|
{
|
498 |
|
|
JvSynchronize sync (&java::lang::Class::class$);
|
499 |
|
|
if (stack_head)
|
500 |
|
|
{
|
501 |
|
|
jclass tmp = stack_head;
|
502 |
|
|
stack_head = tmp->chain;
|
503 |
|
|
return tmp;
|
504 |
|
|
}
|
505 |
|
|
return NULL;
|
506 |
|
|
}
|
507 |
|
|
|
508 |
|
|
void
|
509 |
|
|
_Jv_PushClass (jclass k)
|
510 |
|
|
{
|
511 |
|
|
JvSynchronize sync (&java::lang::Class::class$);
|
512 |
|
|
jclass tmp = stack_head;
|
513 |
|
|
stack_head = k;
|
514 |
|
|
k->chain = tmp;
|
515 |
|
|
}
|