mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-23 09:19:01 +08:00
773c6f0076
* java/lang/natClassLoader.cc (_Jv_WaitForState): Call _Jv_PrepareCompiledClass while holding class mutex. From-SVN: r29063
641 lines
16 KiB
C++
641 lines
16 KiB
C++
// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
|
|
|
|
/* Copyright (C) 1999 Cygnus Solutions
|
|
|
|
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 <cni.h>
|
|
#include <jvm.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/reflect/Modifier.h>
|
|
|
|
#include <java-interp.h>
|
|
|
|
#define CloneableClass _CL_Q34java4lang9Cloneable
|
|
extern java::lang::Class CloneableClass;
|
|
#define ObjectClass _CL_Q34java4lang6Object
|
|
extern java::lang::Class ObjectClass;
|
|
#define ClassClass _CL_Q34java4lang5Class
|
|
extern java::lang::Class ClassClass;
|
|
#define VMClassLoaderClass _CL_Q34java4lang17VMClassLoader
|
|
extern java::lang::Class VMClassLoader;
|
|
#define ClassLoaderClass _CL_Q34java4lang11ClassLoader
|
|
extern java::lang::Class ClassLoaderClass;
|
|
|
|
/////////// java.lang.ClassLoader native methods ////////////
|
|
|
|
#ifdef INTERPRETER
|
|
gnu::gcj::runtime::VMClassLoader *redirect = 0;
|
|
#endif
|
|
|
|
java::lang::ClassLoader*
|
|
java::lang::ClassLoader::getVMClassLoader0 ()
|
|
{
|
|
#ifdef INTERPRETER
|
|
if (redirect == 0)
|
|
redirect = new gnu::gcj::runtime::VMClassLoader;
|
|
return redirect;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
java::lang::ClassLoader::defineClass2 (jclass klass, jbyteArray data,
|
|
jint offset, jint length)
|
|
{
|
|
#ifdef INTERPRETER
|
|
_Jv_DefineClass (klass, data, offset, length);
|
|
#endif
|
|
}
|
|
|
|
java::lang::Class *
|
|
java::lang::ClassLoader::defineClass0 (jstring name,
|
|
jbyteArray data,
|
|
jint offset,
|
|
jint length)
|
|
{
|
|
#ifdef INTERPRETER
|
|
jclass klass;
|
|
klass = (jclass) JvAllocObject (&ClassClass, sizeof (_Jv_InterpClass));
|
|
|
|
// 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);
|
|
|
|
_Jv_VerifyClassName (name2);
|
|
|
|
klass->name = name2;
|
|
}
|
|
|
|
// this will do the magic. loadInto also operates
|
|
// as an exception trampoline for now...
|
|
Throwable *ex = defineClass1 (klass, data, offset, length);
|
|
|
|
if (ex) // we failed to load it
|
|
{
|
|
klass->state = JV_STATE_ERROR;
|
|
klass->notifyAll ();
|
|
|
|
_Jv_UnregisterClass (klass);
|
|
|
|
_Jv_MonitorExit (klass);
|
|
|
|
// FIXME: Here we may want to test that EX does
|
|
// indeed represent a valid exception. That is,
|
|
// anything but ClassNotFoundException,
|
|
// or some kind of Error.
|
|
|
|
JvThrow (ex);
|
|
}
|
|
|
|
// if everything proceeded sucessfully, we're loaded.
|
|
JvAssert (klass->state == JV_STATE_LOADED);
|
|
|
|
// 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)
|
|
{
|
|
_Jv_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 ();
|
|
}
|
|
|
|
|
|
/** this is the only native method in VMClassLoader, so
|
|
we define it here. */
|
|
jclass
|
|
gnu::gcj::runtime::VMClassLoader::findSystemClass (jstring name)
|
|
{
|
|
return _Jv_FindClassInCache (_Jv_makeUtf8Const (name), 0);
|
|
}
|
|
|
|
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);
|
|
JvThrow (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;
|
|
}
|
|
}
|
|
|
|
klass->notifyAll ();
|
|
}
|
|
|
|
|
|
//
|
|
// A single class can have many "initiating" class loaders,
|
|
// and a single "defining" class loader. The Defining
|
|
// class loader is what is returned from Class.getClassLoader()
|
|
// and is used when loading dependent classes during resolution.
|
|
// The set of initiating class loaders are used to ensure
|
|
// safety of linking, and is maintained in the hash table
|
|
// "initiated_classes". A defining classloader is by definition also
|
|
// initiating, so we only store classes in this table, if they have more
|
|
// than one class loader associated.
|
|
//
|
|
|
|
|
|
// Size of local hash table.
|
|
#define HASH_LEN 1013
|
|
|
|
// Hash function for Utf8Consts.
|
|
#define HASH_UTF(Utf) (((Utf)->hash) % HASH_LEN)
|
|
|
|
struct _Jv_LoaderInfo {
|
|
_Jv_LoaderInfo *next;
|
|
java::lang::Class *klass;
|
|
java::lang::ClassLoader *loader;
|
|
};
|
|
|
|
_Jv_LoaderInfo *initiated_classes[HASH_LEN];
|
|
jclass loaded_classes[HASH_LEN];
|
|
|
|
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 = &((*info)->next))
|
|
{
|
|
while ((*info)->klass == the_class)
|
|
{
|
|
*info = (*info)->next;
|
|
}
|
|
}
|
|
|
|
_Jv_MonitorExit (&ClassClass);
|
|
}
|
|
|
|
void
|
|
_Jv_RegisterInitiatingLoader (jclass klass, java::lang::ClassLoader *loader)
|
|
{
|
|
_Jv_LoaderInfo *info = new _Jv_LoaderInfo; // non-gc alloc!
|
|
jint hash = HASH_UTF(klass->name);
|
|
|
|
_Jv_MonitorEnter (&ClassClass);
|
|
info->loader = loader;
|
|
info->klass = klass;
|
|
info->next = initiated_classes[hash];
|
|
initiated_classes[hash] = info;
|
|
_Jv_MonitorExit (&ClassClass);
|
|
|
|
}
|
|
|
|
// This function is called many times during startup, before main() is
|
|
// run. We do our runtime initialization here the very first time we
|
|
// are called. At that point in time we know for certain we are
|
|
// running single-threaded, so we don't need to lock when modifying
|
|
// `init'. CLASSES is NULL-terminated.
|
|
void
|
|
_Jv_RegisterClasses (jclass *classes)
|
|
{
|
|
static bool init = false;
|
|
|
|
if (! init)
|
|
{
|
|
init = true;
|
|
_Jv_InitThreads ();
|
|
_Jv_InitGC ();
|
|
_Jv_InitializeSyncMutex ();
|
|
}
|
|
|
|
JvSynchronize sync (&ClassClass);
|
|
for (; *classes; ++classes)
|
|
{
|
|
jclass klass = *classes;
|
|
jint hash = HASH_UTF (klass->name);
|
|
klass->next = loaded_classes[hash];
|
|
loaded_classes[hash] = klass;
|
|
|
|
// registering a compiled class causes
|
|
// it to be immediately "prepared".
|
|
if (klass->state == JV_STATE_NOTHING)
|
|
klass->state = JV_STATE_COMPILED;
|
|
}
|
|
}
|
|
|
|
void
|
|
_Jv_RegisterClass (jclass klass)
|
|
{
|
|
jclass classes[2];
|
|
classes[0] = klass;
|
|
classes[1] = NULL;
|
|
_Jv_RegisterClasses (classes);
|
|
}
|
|
|
|
#if 0
|
|
// NOTE: this one is out of date with the new loader stuff...
|
|
jclass
|
|
_Jv_FindClassInCache (jstring name, java::lang::ClassLoader *loader)
|
|
{
|
|
JvSynchronize sync (&ClassClass);
|
|
jint hash = name->hashCode();
|
|
jclass klass = loaded_classes[(_Jv_ushort) hash % HASH_LEN];
|
|
for ( ; klass; klass = klass->next)
|
|
{
|
|
if (loader == klass->loader
|
|
&& _Jv_equal (klass->name, name, hash))
|
|
break;
|
|
}
|
|
_Jv_MonitorExit (&ClassClass);
|
|
return klass;
|
|
}
|
|
#endif
|
|
|
|
jclass _Jv_FindClass (_Jv_Utf8Const *name,
|
|
java::lang::ClassLoader *loader)
|
|
{
|
|
jclass klass = _Jv_FindClassInCache (name, loader);
|
|
|
|
#ifdef INTERPRETER
|
|
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" delegateted the loadClass operation
|
|
// to another loader, register explicitly
|
|
// that he is also an initiating loader of the
|
|
// given class.
|
|
|
|
if (klass && (klass->getClassLoader () != loader))
|
|
_Jv_RegisterInitiatingLoader (klass, 0);
|
|
}
|
|
else
|
|
{
|
|
if (redirect == NULL)
|
|
{
|
|
_Jv_InitClass (&ClassLoaderClass);
|
|
java::lang::ClassLoader::getSystemClassLoader ();
|
|
}
|
|
|
|
// Load using the bootstrap loader jmspec 5.3.1
|
|
klass = redirect -> loadClass (sname, false);
|
|
|
|
// register that we're an initiating loader
|
|
if (klass)
|
|
{
|
|
_Jv_RegisterInitiatingLoader (klass, 0);
|
|
}
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
#endif
|
|
|
|
return klass;
|
|
}
|
|
|
|
#if 0
|
|
// NOTE: this one is out of date with the new class loader stuff...
|
|
jclass
|
|
_Jv_FindClass (jstring name, java::lang::ClassLoader *loader)
|
|
{
|
|
jclass klass = _Jv_FindClassInCache (name, loader);
|
|
if (! klass)
|
|
{
|
|
if (loader)
|
|
{
|
|
klass = loader->loadClass(name);
|
|
}
|
|
else
|
|
{
|
|
// jmspec 5.3.1.2
|
|
|
|
// delegate to the system loader
|
|
klass = java::lang::ClassLoader::system.loadClass (sname);
|
|
|
|
// register that we're an initiating loader
|
|
if (klass)
|
|
_Jv_RegisterInitiatingLoader (klass, 0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_Jv_WaitForState (klass, JV_STATE_LOADED);
|
|
}
|
|
|
|
return klass;
|
|
}
|
|
#endif
|
|
|
|
jclass
|
|
_Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
|
|
java::lang::ClassLoader *loader)
|
|
{
|
|
jclass ret = (jclass) JvAllocObject (&ClassClass);
|
|
|
|
ret->next = NULL;
|
|
ret->name = name;
|
|
ret->accflags = 0;
|
|
ret->superclass = superclass;
|
|
ret->constants.size = 0;
|
|
ret->constants.tags = NULL;
|
|
ret->constants.data = NULL;
|
|
ret->methods = NULL;
|
|
ret->method_count = 0;
|
|
ret->vtable_method_count = 0;
|
|
ret->fields = NULL;
|
|
ret->size_in_bytes = 0;
|
|
ret->field_count = 0;
|
|
ret->static_field_count = 0;
|
|
ret->vtable = NULL;
|
|
ret->interfaces = NULL;
|
|
ret->loader = loader;
|
|
ret->interface_count = 0;
|
|
ret->state = JV_STATE_NOTHING;
|
|
ret->thread = NULL;
|
|
|
|
_Jv_RegisterClass (ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
jclass
|
|
_Jv_FindArrayClass (jclass element, java::lang::ClassLoader *loader)
|
|
{
|
|
_Jv_Utf8Const *array_name;
|
|
int len;
|
|
if (element->isPrimitive())
|
|
{
|
|
// For primitive types the array is cached in the class.
|
|
jclass ret = (jclass) element->methods;
|
|
if (ret)
|
|
return ret;
|
|
len = 3;
|
|
}
|
|
else
|
|
len = element->name->length + 5;
|
|
|
|
{
|
|
char signature[len];
|
|
int index = 0;
|
|
signature[index++] = '[';
|
|
// Compute name of array class to see if we've already cached it.
|
|
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);
|
|
}
|
|
|
|
jclass array_class = _Jv_FindClassInCache (array_name, element->loader);
|
|
|
|
if (! array_class)
|
|
{
|
|
// Create new array class.
|
|
array_class = _Jv_NewClass (array_name, &ObjectClass, element->loader);
|
|
|
|
// Note that `vtable_method_count' doesn't include the initial
|
|
// NULL slot.
|
|
int dm_count = ObjectClass.vtable_method_count + 1;
|
|
|
|
// Create a new vtable by copying Object's vtable (except the
|
|
// class pointer, of course). Note that we allocate this as
|
|
// unscanned memory -- the vtables are handled specially by the
|
|
// GC.
|
|
int size = (sizeof (_Jv_VTable) +
|
|
((dm_count - 1) * sizeof (void *)));
|
|
_Jv_VTable *vtable = (_Jv_VTable *) _Jv_AllocBytes (size);
|
|
vtable->clas = array_class;
|
|
memcpy (vtable->method, ObjectClass.vtable->method,
|
|
dm_count * sizeof (void *));
|
|
array_class->vtable = vtable;
|
|
array_class->vtable_method_count = ObjectClass.vtable_method_count;
|
|
|
|
// Stash the pointer to the element type.
|
|
array_class->methods = (_Jv_Method *) element;
|
|
|
|
// Register our interfaces.
|
|
// FIXME: for JDK 1.2 we need Serializable.
|
|
static jclass interfaces[] = { &CloneableClass };
|
|
array_class->interfaces = interfaces;
|
|
array_class->interface_count = 1;
|
|
|
|
// as per vmspec 5.3.3.2
|
|
array_class->accflags = element->accflags;
|
|
|
|
// FIXME: initialize other Class instance variables,
|
|
// e.g. `fields'.
|
|
|
|
// say this class is initialized and ready to go!
|
|
array_class->state = JV_STATE_DONE;
|
|
|
|
// vmspec, section 5.3.3 describes this
|
|
if (element->loader != loader)
|
|
_Jv_RegisterInitiatingLoader (array_class, loader);
|
|
}
|
|
|
|
// For primitive types, point back at this array.
|
|
if (element->isPrimitive())
|
|
element->methods = (_Jv_Method *) array_class;
|
|
|
|
return array_class;
|
|
}
|
|
|
|
|