608 lines
15 KiB
C++
608 lines
15 KiB
C++
// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
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/* Copyright (C) 1999, 2000 Red Hat, Inc.
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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 <string.h>
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#include <gcj/cni.h>
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#include <jvm.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 <gnu/gcj/runtime/VMClassLoader.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/ClassFormatError.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/reflect/Modifier.h>
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#include <java/lang/Runtime.h>
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#define CloneableClass _CL_Q34java4lang9Cloneable
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extern java::lang::Class CloneableClass;
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#define ObjectClass _CL_Q34java4lang6Object
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extern java::lang::Class ObjectClass;
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#define ClassClass _CL_Q34java4lang5Class
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extern java::lang::Class ClassClass;
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#define VMClassLoaderClass _CL_Q34java4lang17VMClassLoader
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extern java::lang::Class VMClassLoader;
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#define ClassLoaderClass _CL_Q34java4lang11ClassLoader
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extern java::lang::Class ClassLoaderClass;
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/////////// java.lang.ClassLoader native methods ////////////
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java::lang::ClassLoader *
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java::lang::ClassLoader::getSystemClassLoader (void)
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{
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JvSynchronize sync (&ClassLoaderClass);
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if (! system)
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system = gnu::gcj::runtime::VMClassLoader::getVMClassLoader ();
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return system;
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}
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void
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java::lang::ClassLoader::defineClass2 (jclass klass, jbyteArray data,
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jint offset, jint length)
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{
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#ifdef INTERPRETER
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_Jv_DefineClass (klass, data, offset, length);
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#endif
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}
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java::lang::Class *
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java::lang::ClassLoader::defineClass0 (jstring name,
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jbyteArray data,
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jint offset,
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jint length)
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{
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#ifdef INTERPRETER
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jclass klass;
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klass = (jclass) JvAllocObject (&ClassClass, sizeof (_Jv_InterpClass));
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// synchronize on the class, so that it is not
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// attempted initialized until we're done loading.
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_Jv_MonitorEnter (klass);
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// record which is the defining loader
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klass->loader = this;
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// register that we are the initiating loader...
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if (name != 0)
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{
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_Jv_Utf8Const * name2 = _Jv_makeUtf8Const (name);
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_Jv_VerifyClassName (name2);
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klass->name = name2;
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}
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// this will do the magic. loadInto also operates
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// as an exception trampoline for now...
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Throwable *ex = defineClass1 (klass, data, offset, length);
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if (ex) // we failed to load it
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{
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klass->state = JV_STATE_ERROR;
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klass->notifyAll ();
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_Jv_UnregisterClass (klass);
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_Jv_MonitorExit (klass);
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// FIXME: Here we may want to test that EX does
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// indeed represent a valid exception. That is,
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// anything but ClassNotFoundException,
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// or some kind of Error.
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JvThrow (ex);
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}
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// if everything proceeded sucessfully, we're loaded.
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JvAssert (klass->state == JV_STATE_LOADED);
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// if an exception is generated, this is initially missed.
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// however, we come back here in handleException0 below...
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_Jv_MonitorExit (klass);
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return klass;
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#else // INTERPRETER
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return 0;
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#endif
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}
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void
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_Jv_WaitForState (jclass klass, int state)
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{
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if (klass->state >= state)
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return;
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_Jv_MonitorEnter (klass) ;
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if (state == JV_STATE_LINKED)
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{
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// Must call _Jv_PrepareCompiledClass while holding the class
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// mutex.
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_Jv_PrepareCompiledClass (klass);
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_Jv_MonitorExit (klass);
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return;
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}
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java::lang::Thread *self = java::lang::Thread::currentThread();
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// this is similar to the strategy for class initialization.
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// if we already hold the lock, just leave.
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while (klass->state <= state
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&& klass->thread
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&& klass->thread != self)
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klass->wait ();
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_Jv_MonitorExit (klass);
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if (klass->state == JV_STATE_ERROR)
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{
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_Jv_Throw (new java::lang::LinkageError ());
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}
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}
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// Finish linking a class. Only called from ClassLoader::resolveClass.
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void
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java::lang::ClassLoader::linkClass0 (java::lang::Class *klass)
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{
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if (klass->state >= JV_STATE_LINKED)
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return;
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#ifdef INTERPRETER
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if (_Jv_IsInterpretedClass (klass))
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{
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_Jv_PrepareClass (klass);
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}
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#endif
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_Jv_PrepareCompiledClass (klass);
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}
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void
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java::lang::ClassLoader::markClassErrorState0 (java::lang::Class *klass)
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{
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klass->state = JV_STATE_ERROR;
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klass->notifyAll ();
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}
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/** this is the only native method in VMClassLoader, so
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we define it here. */
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jclass
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gnu::gcj::runtime::VMClassLoader::findSystemClass (jstring name)
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{
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_Jv_Utf8Const *name_u = _Jv_makeUtf8Const (name);
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jclass klass = _Jv_FindClassInCache (name_u, 0);
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if (! klass)
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{
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// Turn `gnu.pkg.quux' into `gnu-pkg-quux'. Then search for a
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// module named (eg, on Linux) `gnu-pkg-quux.so', followed by
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// `gnu-pkg.so' and `gnu.so'. If loading one of these causes
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// the class to appear in the cache, then use it.
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jstring so_base_name = name->replace ('.', '-');
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while (! klass && so_base_name && so_base_name->length() > 0)
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{
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using namespace ::java::lang;
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Runtime *rt = Runtime::getRuntime();
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jboolean loaded = rt->loadLibraryInternal (so_base_name);
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jint nd = so_base_name->lastIndexOf ('-');
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if (nd == -1)
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so_base_name = NULL;
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else
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so_base_name = so_base_name->substring (0, nd);
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if (loaded)
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klass = _Jv_FindClassInCache (name_u, 0);
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}
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}
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return klass;
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}
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jclass
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java::lang::ClassLoader::findLoadedClass (jstring name)
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{
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return _Jv_FindClassInCache (_Jv_makeUtf8Const (name), this);
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}
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/** This function does class-preparation for compiled classes.
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NOTE: It contains replicated functionality from
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_Jv_ResolvePoolEntry, and this is intentional, since that function
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lives in resolve.cc which is entirely conditionally compiled.
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*/
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void
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_Jv_PrepareCompiledClass(jclass klass)
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{
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if (klass->state >= JV_STATE_LINKED)
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return;
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// Short-circuit, so that mutually dependent classes are ok.
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klass->state = JV_STATE_LINKED;
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_Jv_Constants *pool = &klass->constants;
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for (int index = 1; index < pool->size; ++index)
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{
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if (pool->tags[index] == JV_CONSTANT_Class)
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{
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_Jv_Utf8Const *name = pool->data[index].utf8;
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jclass found;
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if (name->data[0] == '[')
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found = _Jv_FindClassFromSignature (&name->data[0],
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klass->loader);
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else
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found = _Jv_FindClass (name, klass->loader);
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if (! found)
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{
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jstring str = _Jv_NewStringUTF (name->data);
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JvThrow (new java::lang::ClassNotFoundException (str));
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}
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pool->data[index].clazz = found;
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pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
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}
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else if (pool->tags[index] == JV_CONSTANT_String)
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{
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jstring str;
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str = _Jv_NewStringUtf8Const (pool->data[index].utf8);
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pool->data[index].o = str;
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pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
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}
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}
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klass->notifyAll ();
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}
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//
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// A single class can have many "initiating" class loaders,
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// and a single "defining" class loader. The Defining
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// class loader is what is returned from Class.getClassLoader()
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// and is used when loading dependent classes during resolution.
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// The set of initiating class loaders are used to ensure
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// safety of linking, and is maintained in the hash table
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// "initiated_classes". A defining classloader is by definition also
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// initiating, so we only store classes in this table, if they have more
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// than one class loader associated.
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//
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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)->hash) % HASH_LEN)
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struct _Jv_LoaderInfo {
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_Jv_LoaderInfo *next;
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java::lang::Class *klass;
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java::lang::ClassLoader *loader;
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};
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_Jv_LoaderInfo *initiated_classes[HASH_LEN];
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jclass loaded_classes[HASH_LEN];
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jclass
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_Jv_FindClassInCache (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
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{
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_Jv_MonitorEnter (&ClassClass);
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jint hash = HASH_UTF (name);
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// first, if LOADER is a defining loader, then it is also initiating
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jclass klass;
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for (klass = loaded_classes[hash]; klass; klass = klass->next)
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{
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if (loader == klass->loader && _Jv_equalUtf8Consts (name, klass->name))
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break;
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}
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// otherwise, it may be that the class in question was defined
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// by some other loader, but that the loading was initiated by
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// the loader in question.
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if (!klass)
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{
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_Jv_LoaderInfo *info;
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for (info = initiated_classes[hash]; info; info = info->next)
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{
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if (loader == info->loader
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&& _Jv_equalUtf8Consts (name, info->klass->name))
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{
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klass = info->klass;
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break;
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}
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}
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}
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_Jv_MonitorExit (&ClassClass);
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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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_Jv_MonitorEnter (&ClassClass);
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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))
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{
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if (*klass == the_class)
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{
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*klass = (*klass)->next;
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break;
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}
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}
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_Jv_LoaderInfo **info = &(initiated_classes[hash]);
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for ( ; *info; info = &((*info)->next))
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{
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while ((*info)->klass == the_class)
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{
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*info = (*info)->next;
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}
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}
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_Jv_MonitorExit (&ClassClass);
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}
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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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_Jv_LoaderInfo *info = new _Jv_LoaderInfo; // non-gc alloc!
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jint hash = HASH_UTF(klass->name);
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_Jv_MonitorEnter (&ClassClass);
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info->loader = loader;
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info->klass = klass;
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info->next = initiated_classes[hash];
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initiated_classes[hash] = info;
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_Jv_MonitorExit (&ClassClass);
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}
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// This function is called many times during startup, before main() is
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// run. We do our runtime initialization here the very first time we
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// are called. At that point in time we know for certain we are
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// running single-threaded, so we don't need to lock when modifying
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// `init'. CLASSES is NULL-terminated.
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void
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_Jv_RegisterClasses (jclass *classes)
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{
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static bool init = false;
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if (! init)
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{
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init = true;
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_Jv_InitThreads ();
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_Jv_InitGC ();
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_Jv_InitializeSyncMutex ();
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}
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JvSynchronize sync (&ClassClass);
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for (; *classes; ++classes)
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{
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jclass klass = *classes;
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jint hash = HASH_UTF (klass->name);
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klass->next = loaded_classes[hash];
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loaded_classes[hash] = klass;
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// registering a compiled class causes
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// it to be immediately "prepared".
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if (klass->state == JV_STATE_NOTHING)
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klass->state = JV_STATE_COMPILED;
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}
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}
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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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jclass
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_Jv_FindClass (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
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{
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jclass klass = _Jv_FindClassInCache (name, loader);
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if (! klass)
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{
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jstring sname = _Jv_NewStringUTF (name->data);
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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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klass = loader->loadClass(sname, false);
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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.
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if (klass && (klass->getClassLoader () != loader))
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_Jv_RegisterInitiatingLoader (klass, loader);
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}
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else
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{
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java::lang::ClassLoader *sys = java::lang::ClassLoader::system;
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if (sys == NULL)
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{
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_Jv_InitClass (&ClassLoaderClass);
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sys = java::lang::ClassLoader::getSystemClassLoader ();
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}
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// Load using the bootstrap loader jvmspec 5.3.1.
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klass = sys->loadClass (sname, false);
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// Register that we're an initiating loader.
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if (klass)
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_Jv_RegisterInitiatingLoader (klass, 0);
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}
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}
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else
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{
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// we need classes to be in the hash while
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// we're loading, so that they can refer to themselves.
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_Jv_WaitForState (klass, JV_STATE_LOADED);
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}
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return klass;
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}
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jclass
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_Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
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java::lang::ClassLoader *loader)
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{
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jclass ret = (jclass) JvAllocObject (&ClassClass);
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ret->next = NULL;
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ret->name = name;
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ret->accflags = 0;
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ret->superclass = superclass;
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ret->constants.size = 0;
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ret->constants.tags = NULL;
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ret->constants.data = NULL;
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ret->methods = NULL;
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ret->method_count = 0;
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ret->vtable_method_count = 0;
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ret->fields = NULL;
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ret->size_in_bytes = 0;
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ret->field_count = 0;
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ret->static_field_count = 0;
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ret->vtable = NULL;
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ret->interfaces = NULL;
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ret->loader = loader;
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ret->interface_count = 0;
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ret->state = JV_STATE_NOTHING;
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ret->thread = NULL;
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_Jv_RegisterClass (ret);
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return ret;
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}
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jclass
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_Jv_FindArrayClass (jclass element, java::lang::ClassLoader *loader)
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{
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_Jv_Utf8Const *array_name;
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int len;
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if (element->isPrimitive())
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{
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// For primitive types the array is cached in the class.
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jclass ret = (jclass) element->methods;
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if (ret)
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return ret;
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len = 3;
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}
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else
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len = element->name->length + 5;
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{
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char signature[len];
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int index = 0;
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signature[index++] = '[';
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// Compute name of array class to see if we've already cached it.
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if (element->isPrimitive())
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{
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signature[index++] = (char) element->method_count;
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}
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else
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{
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size_t length = element->name->length;
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const char *const name = element->name->data;
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if (name[0] != '[')
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signature[index++] = 'L';
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memcpy (&signature[index], name, length);
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index += length;
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if (name[0] != '[')
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signature[index++] = ';';
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}
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array_name = _Jv_makeUtf8Const (signature, index);
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}
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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;
|
|
}
|
|
|
|
|