735 lines
19 KiB
C++
735 lines
19 KiB
C++
// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
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/* Copyright (C) 1999, 2000, 2001, 2002 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 <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/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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/////////// java.lang.ClassLoader native methods ////////////
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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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java::security::ProtectionDomain *pd)
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{
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#ifdef INTERPRETER
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jclass klass;
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klass = (jclass) JvAllocObject (&java::lang::Class::class$,
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sizeof (_Jv_InterpClass));
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_Jv_InitNewClassFields (klass);
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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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if (! _Jv_VerifyClassName (name2))
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throw new java::lang::ClassFormatError
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(JvNewStringLatin1 ("erroneous class name"));
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klass->name = name2;
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}
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try
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{
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_Jv_DefineClass (klass, data, offset, length);
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}
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catch (java::lang::Throwable *ex)
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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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// FIXME: Rewrite this as a cleanup instead of
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// as a catch handler.
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throw ex;
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}
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klass->protectionDomain = pd;
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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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throw new java::lang::LinkageError;
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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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_Jv_PrepareClass (klass);
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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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jclass
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java::lang::VMClassLoader::defineClass (java::lang::ClassLoader *cl,
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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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return cl->defineClass (name, data, offset, length);
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}
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jclass
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java::lang::VMClassLoader::getPrimitiveClass (jchar type)
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{
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char sig[2];
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sig[0] = (char) type;
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sig[1] = '\0';
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return _Jv_FindClassFromSignature (sig, NULL);
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}
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// This is the findClass() implementation for the System classloader. It is
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// the only native method in VMClassLoader, so we define it here.
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jclass
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gnu::gcj::runtime::VMClassLoader::findClass (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 `lib-gnu-pkg-quux'. Then search for
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// a module named (eg, on Linux) `lib-gnu-pkg-quux.so', followed
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// by `lib-gnu-pkg.so' and `lib-gnu.so'. If loading one of
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// these causes the class to appear in the cache, then use it.
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java::lang::StringBuffer *sb = new java::lang::StringBuffer (JvNewStringLatin1("lib-"));
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// Skip inner classes
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jstring cn;
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jint ci = name->indexOf('$');
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if (ci == -1)
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cn = name;
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else
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cn = name->substring (0, ci);
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jstring so_base_name = (sb->append (cn)->toString ())->replace ('.', '-');
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// Compare against `3' because that is the length of "lib".
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while (! klass && so_base_name && so_base_name->length() > 3)
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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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// Now try loading using the interpreter.
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if (! klass)
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{
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klass = java::net::URLClassLoader::findClass (name);
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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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throw new java::lang::NoClassDefFoundError (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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#ifdef INTERPRETER
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// FIXME: although the comment up top says that this function is
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// only called for compiled classes, it is actually called for every
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// class.
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if (! _Jv_IsInterpretedClass (klass))
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{
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#endif /* INTERPRETER */
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jfieldID f = JvGetFirstStaticField (klass);
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for (int n = JvNumStaticFields (klass); n > 0; --n)
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{
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int mod = f->getModifiers ();
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// If we have a static String field with a non-null initial
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// value, we know it points to a Utf8Const.
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if (f->getClass () == &java::lang::String::class$
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&& java::lang::reflect::Modifier::isStatic (mod))
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{
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jstring *strp = (jstring *) f->u.addr;
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if (*strp)
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*strp = _Jv_NewStringUtf8Const ((_Jv_Utf8Const *) *strp);
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}
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f = f->getNextField ();
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}
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#ifdef INTERPRETER
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}
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#endif /* INTERPRETER */
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if (klass->vtable == NULL)
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_Jv_MakeVTable(klass);
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if (klass->otable != NULL && klass->otable->state == 0)
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_Jv_LinkOffsetTable(klass);
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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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static _Jv_LoaderInfo *initiated_classes[HASH_LEN];
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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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jclass
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_Jv_FindClassInCache (_Jv_Utf8Const *name, java::lang::ClassLoader *loader)
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{
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_Jv_MonitorEnter (&java::lang::Class::class$);
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jint hash = HASH_UTF (name);
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// first, if LOADER is a defining loader, then it is also initiating
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jclass klass;
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for (klass = loaded_classes[hash]; klass; klass = klass->next)
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{
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if (loader == klass->loader && _Jv_equalUtf8Consts (name, klass->name))
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break;
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}
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// otherwise, it may be that the class in question was defined
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// by some other loader, but that the loading was initiated by
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// the loader in question.
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if (!klass)
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{
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_Jv_LoaderInfo *info;
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for (info = initiated_classes[hash]; info; info = info->next)
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{
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if (loader == info->loader
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&& _Jv_equalUtf8Consts (name, info->klass->name))
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{
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klass = info->klass;
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break;
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}
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}
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}
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_Jv_MonitorExit (&java::lang::Class::class$);
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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 (&java::lang::Class::class$);
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jint hash = HASH_UTF(the_class->name);
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jclass *klass = &(loaded_classes[hash]);
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for ( ; *klass; klass = &((*klass)->next))
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{
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if (*klass == the_class)
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{
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*klass = (*klass)->next;
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break;
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}
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}
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_Jv_LoaderInfo **info = &(initiated_classes[hash]);
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for ( ; ; info = &((*info)->next))
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{
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while (*info && (*info)->klass == the_class)
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{
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*info = (*info)->next;
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}
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if (*info == NULL)
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break;
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}
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_Jv_MonitorExit (&java::lang::Class::class$);
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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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// non-gc alloc!
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_Jv_LoaderInfo *info = (_Jv_LoaderInfo *) _Jv_Malloc (sizeof(_Jv_LoaderInfo));
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jint hash = HASH_UTF(klass->name);
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_Jv_MonitorEnter (&java::lang::Class::class$);
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info->loader = loader;
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info->klass = klass;
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info->next = initiated_classes[hash];
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initiated_classes[hash] = info;
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_Jv_MonitorExit (&java::lang::Class::class$);
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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 (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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(*_Jv_RegisterClassHook) (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_RegisterClassHookDefault (jclass klass)
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{
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jint hash = HASH_UTF (klass->name);
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jclass check_class = loaded_classes[hash];
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// If the class is already registered, don't re-register it.
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while (check_class != NULL)
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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->data,
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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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check_class = check_class->next;
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}
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klass->next = 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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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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{
|
||
java::lang::ClassLoader *sys
|
||
= java::lang::ClassLoader::getSystemClassLoader ();
|
||
|
||
// Load using the bootstrap loader jvmspec 5.3.1.
|
||
klass = sys->loadClass (sname, false);
|
||
|
||
// Register that we're an initiating loader.
|
||
if (klass)
|
||
_Jv_RegisterInitiatingLoader (klass, 0);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
// we need classes to be in the hash while
|
||
// we're loading, so that they can refer to themselves.
|
||
_Jv_WaitForState (klass, JV_STATE_LOADED);
|
||
}
|
||
|
||
return klass;
|
||
}
|
||
|
||
void
|
||
_Jv_InitNewClassFields (jclass ret)
|
||
{
|
||
ret->next = NULL;
|
||
ret->name = NULL;
|
||
ret->accflags = 0;
|
||
ret->superclass = NULL;
|
||
ret->constants.size = 0;
|
||
ret->constants.tags = NULL;
|
||
ret->constants.data = NULL;
|
||
ret->methods = NULL;
|
||
ret->method_count = 0;
|
||
ret->vtable_method_count = 0;
|
||
ret->fields = NULL;
|
||
ret->size_in_bytes = 0;
|
||
ret->field_count = 0;
|
||
ret->static_field_count = 0;
|
||
ret->vtable = NULL;
|
||
ret->interfaces = NULL;
|
||
ret->loader = NULL;
|
||
ret->interface_count = 0;
|
||
ret->state = JV_STATE_NOTHING;
|
||
ret->thread = NULL;
|
||
ret->depth = 0;
|
||
ret->ancestors = NULL;
|
||
ret->idt = NULL;
|
||
ret->arrayclass = NULL;
|
||
}
|
||
|
||
jclass
|
||
_Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
|
||
java::lang::ClassLoader *loader)
|
||
{
|
||
jclass ret = (jclass) JvAllocObject (&java::lang::Class::class$);
|
||
_Jv_InitNewClassFields (ret);
|
||
ret->name = name;
|
||
ret->superclass = superclass;
|
||
ret->loader = loader;
|
||
|
||
_Jv_RegisterClass (ret);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static _Jv_IDispatchTable *array_idt = NULL;
|
||
static jshort array_depth = 0;
|
||
static jclass *array_ancestors = NULL;
|
||
|
||
// Create a class representing an array of ELEMENT and store a pointer to it
|
||
// in element->arrayclass. LOADER is the ClassLoader which _initiated_ the
|
||
// instantiation of this array. ARRAY_VTABLE is the vtable to use for the new
|
||
// array class. This parameter is optional.
|
||
void
|
||
_Jv_NewArrayClass (jclass element, java::lang::ClassLoader *loader,
|
||
_Jv_VTable *array_vtable)
|
||
{
|
||
JvSynchronize sync (element);
|
||
|
||
_Jv_Utf8Const *array_name;
|
||
int len;
|
||
|
||
if (element->arrayclass)
|
||
return;
|
||
|
||
if (element->isPrimitive())
|
||
{
|
||
if (element == JvPrimClass (void))
|
||
throw new java::lang::ClassNotFoundException ();
|
||
len = 3;
|
||
}
|
||
else
|
||
len = element->name->length + 5;
|
||
|
||
{
|
||
char signature[len];
|
||
int index = 0;
|
||
signature[index++] = '[';
|
||
// Compute name of array class.
|
||
if (element->isPrimitive())
|
||
{
|
||
signature[index++] = (char) element->method_count;
|
||
}
|
||
else
|
||
{
|
||
size_t length = element->name->length;
|
||
const char *const name = element->name->data;
|
||
if (name[0] != '[')
|
||
signature[index++] = 'L';
|
||
memcpy (&signature[index], name, length);
|
||
index += length;
|
||
if (name[0] != '[')
|
||
signature[index++] = ';';
|
||
}
|
||
array_name = _Jv_makeUtf8Const (signature, index);
|
||
}
|
||
|
||
// Create new array class.
|
||
jclass array_class = _Jv_NewClass (array_name, &java::lang::Object::class$,
|
||
element->loader);
|
||
|
||
// Note that `vtable_method_count' doesn't include the initial
|
||
// gc_descr slot.
|
||
JvAssert (java::lang::Object::class$.vtable_method_count
|
||
== NUM_OBJECT_METHODS);
|
||
int dm_count = java::lang::Object::class$.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$.vtable_method_count;
|
||
|
||
// Stash the pointer to the element type.
|
||
array_class->methods = (_Jv_Method *) element;
|
||
|
||
// Register our interfaces.
|
||
static jclass interfaces[] =
|
||
{
|
||
&java::lang::Cloneable::class$,
|
||
&java::io::Serializable::class$
|
||
};
|
||
array_class->interfaces = interfaces;
|
||
array_class->interface_count = sizeof interfaces / sizeof interfaces[0];
|
||
|
||
// Since all array classes have the same interface dispatch table, we can
|
||
// cache one and reuse it. It is not necessary to synchronize this.
|
||
if (!array_idt)
|
||
{
|
||
_Jv_PrepareConstantTimeTables (array_class);
|
||
array_idt = array_class->idt;
|
||
array_depth = array_class->depth;
|
||
array_ancestors = array_class->ancestors;
|
||
}
|
||
else
|
||
{
|
||
array_class->idt = array_idt;
|
||
array_class->depth = array_depth;
|
||
array_class->ancestors = array_ancestors;
|
||
}
|
||
|
||
using namespace java::lang::reflect;
|
||
{
|
||
// Array classes are "abstract final"...
|
||
_Jv_ushort accflags = Modifier::FINAL | Modifier::ABSTRACT;
|
||
// ... and inherit accessibility from element type, per vmspec 5.3.3.2
|
||
accflags |= (element->accflags & Modifier::PUBLIC);
|
||
accflags |= (element->accflags & Modifier::PROTECTED);
|
||
accflags |= (element->accflags & Modifier::PRIVATE);
|
||
array_class->accflags = accflags;
|
||
}
|
||
|
||
// An array class has no visible instance fields. "length" is invisible to
|
||
// reflection.
|
||
|
||
// say this class is initialized and ready to go!
|
||
array_class->state = JV_STATE_DONE;
|
||
|
||
// vmspec, section 5.3.3 describes this
|
||
if (element->loader != loader)
|
||
_Jv_RegisterInitiatingLoader (array_class, loader);
|
||
|
||
element->arrayclass = array_class;
|
||
}
|