149 lines
3.6 KiB
C++
149 lines
3.6 KiB
C++
// natSharedLibLoader.cc - Implementation of SharedLibHelper native methods.
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/* Copyright (C) 2001, 2003, 2004, 2005, 2006 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <platform.h>
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <execution.h>
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#include <gnu/gcj/runtime/SharedLibHelper.h>
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#include <java/io/IOException.h>
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#include <java/lang/UnsupportedOperationException.h>
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#include <java/lang/UnknownError.h>
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#include <java/lang/VMClassLoader.h>
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// If we're using the Boehm GC, then we need this include to override dlopen.
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#ifdef HAVE_BOEHM_GC
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// Set GC_DEBUG before including gc.h!
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#ifdef LIBGCJ_GC_DEBUG
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# define GC_DEBUG
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#endif
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#include <gc.h>
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#endif /* HAVE_BOEHM_GC */
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#ifdef HAVE_DLOPEN
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#include <dlfcn.h>
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/* Only used during dlopen, while having a lock on Class.class. */
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static java::lang::ClassLoader *curLoader;
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static gnu::gcj::runtime::SharedLibHelper *curHelper;
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typedef void (*ClassHookFunc) (jclass);
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typedef void (*CoreHookFunc) (_Jv_core_chain *);
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void
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_Jv_sharedlib_register_hook (jclass cls)
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{
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cls->protectionDomain = curHelper->domain;
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cls->loader = curLoader;
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if (! cls->engine)
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cls->engine = &_Jv_soleCompiledEngine;
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curHelper->registerClass(cls->getName(), cls);
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}
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static void
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core_hook (_Jv_core_chain *chain)
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{
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chain->next = (_Jv_core_chain *) curHelper->core_chain;
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curHelper->core_chain = (gnu::gcj::RawData *) chain;
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}
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struct SharedLibDummy
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{
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ClassHookFunc saved;
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CoreHookFunc saved_core;
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SharedLibDummy()
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{
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saved = _Jv_RegisterClassHook;
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saved_core = _Jv_RegisterCoreHook;
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}
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~SharedLibDummy()
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{
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_Jv_RegisterClassHook = saved;
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_Jv_RegisterCoreHook = saved_core;
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curLoader = NULL;
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}
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};
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#endif
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void
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gnu::gcj::runtime::SharedLibHelper::init(void)
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{
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#ifdef HAVE_DLOPEN
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char *lname = (char *) __builtin_alloca (JvGetStringUTFLength (baseName)
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+ 1);
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jsize total = JvGetStringUTFRegion (baseName, 0, baseName->length(), lname);
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lname[total] = '\0';
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if (flags==0)
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flags = RTLD_GLOBAL | RTLD_LAZY;
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JvSynchronize dummy1(&::java::lang::Class::class$);
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SharedLibDummy dummy2;
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curLoader = ((void*)loader == ::java::lang::VMClassLoader::bootLoader
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? NULL : loader);
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curHelper = this;
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_Jv_RegisterClassHook = _Jv_sharedlib_register_hook;
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_Jv_RegisterCoreHook = core_hook;
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void *h = dlopen(lname, flags);
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if (h == NULL)
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{
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const char *msg = dlerror();
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throw new ::java::lang::UnknownError(JvNewStringLatin1(msg));
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}
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handler = (gnu::gcj::RawData*) h;
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#else
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const char *msg
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= "shared library class loading is not supported on this platform";
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throw new ::java::lang::UnsupportedOperationException(JvNewStringLatin1(msg));
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#endif
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}
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jboolean
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gnu::gcj::runtime::SharedLibHelper::hasResource (jstring name)
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{
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#ifdef HAVE_DLOPEN
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_Jv_core_chain *node = _Jv_FindCore ((_Jv_core_chain *) core_chain, name);
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return node != NULL;
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#else
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return false;
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#endif
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}
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gnu::gcj::Core *
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gnu::gcj::runtime::SharedLibHelper::findCore (jstring name)
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{
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#ifdef HAVE_DLOPEN
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extern gnu::gcj::Core *_Jv_create_core (_Jv_core_chain *node, jstring name);
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ensureInit();
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return _Jv_create_core ((_Jv_core_chain *) core_chain, name);
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#else
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return NULL;
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#endif
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}
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void
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gnu::gcj::runtime::SharedLibHelper::finalize()
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{
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_Jv_FreeCoreChain ((_Jv_core_chain *) core_chain);
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#ifdef HAVE_DLOPEN
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if (handler)
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dlclose (handler);
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#endif
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}
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void
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gnu::gcj::runtime::SharedLibHelper::ensureSupersLinked(jclass k)
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{
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_Jv_Linker::wait_for_state (k, JV_STATE_LOADING);
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}
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