path: root/recipes/gcc/gcc-4.4.1/debian/libjava-loading-constraints.dpatch

#! /bin/sh -e

# DP: Reimplement loading constraints (taken from the trunk).

dir=
if [ $# -eq 3 -a "$2" = '-d' ]; then
    pdir="-d $3"
    dir="$3/"
elif [ $# -ne 1 ]; then
    echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
    exit 1
fi
case "$1" in
    -patch)
        patch $pdir -f --no-backup-if-mismatch -p0 < $0
	uudecode $0
	tar -xv -f class-loader-classes.tar.bz2 -C ${dir}libjava
	rm -f class-loader-classes.tar.bz2*
        ;;
    -unpatch)
        patch $pdir -f --no-backup-if-mismatch -R -p0 < $0
        ;;
    *)
        echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
        exit 1
esac
exit 0

2008-03-13  Tom Tromey  <tromey@redhat.com>

	* java/lang/natClassLoader.cc (_Jv_RegisterInitiatingLoader):
	Check loading constraints.
	(_Jv_CheckOrCreateLoadingConstraint): New function.
	* java/lang/ClassLoader.java (loadingConstraints): New field.
	* link.cc (_Jv_Linker::find_field): Use
	_Jv_CheckOrCreateLoadingConstraint.
	(_Jv_Linker::check_loading_constraints): New function.
	(_Jv_Linker::resolve_method_entry): Use
	check_loading_constraints.
	(_Jv_Linker::append_partial_itable): Likewise.
	(_Jv_Linker::layout_vtable_methods): Likewise.
	* include/jvm.h (_Jv_Linker::check_loading_constraints): Declare.
	(_Jv_CheckOrCreateLoadingConstraint): Declare.

--- libjava/include/jvm.h.orig	2008-03-21 22:09:54.249100837 +0100
+++ libjava/include/jvm.h	2008-03-21 22:10:20.739500439 +0100
@@ -1,6 +1,6 @@
 // jvm.h - Header file for private implementation information. -*- c++ -*-
 
-/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -265,6 +265,7 @@
 				      jclass, jclass *);
   static _Jv_Field *find_field(jclass, jclass, jclass *, _Jv_Utf8Const *,
 			       _Jv_Utf8Const *);
+  static void check_loading_constraints (_Jv_Method *, jclass, jclass);
   static void prepare_constant_time_tables(jclass);
   static jshort get_interfaces(jclass, _Jv_ifaces *);
   static void link_symbol_table(jclass);
@@ -557,6 +558,9 @@
 				jboolean is_jni_call = true,
 				jclass iface = NULL);
 
+extern void _Jv_CheckOrCreateLoadingConstraint (jclass,
+						java::lang::ClassLoader *);
+
 extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
   __attribute__((__malloc__));
 
--- libjava/java/lang/ClassLoader.h.orig	2008-03-21 22:09:54.249100837 +0100
+++ libjava/java/lang/ClassLoader.h	2008-03-21 22:10:20.749500589 +0100
@@ -86,6 +86,7 @@
   void checkInitialized();
 public: // actually package-private
   ::java::util::HashMap * __attribute__((aligned(__alignof__( ::java::lang::Object)))) loadedClasses;
+  ::java::util::HashMap * loadingConstraints;
   ::java::util::HashMap * definedPackages;
 private:
   ::java::lang::ClassLoader * parent;
--- libjava/java/lang/ClassLoader.java.orig	2008-03-21 22:09:54.249100837 +0100
+++ libjava/java/lang/ClassLoader.java	2008-03-21 22:10:20.749500589 +0100
@@ -1,5 +1,5 @@
 /* ClassLoader.java -- responsible for loading classes into the VM
-   Copyright (C) 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
 
@@ -45,6 +45,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.lang.ref.WeakReference;
 import java.net.URL;
 import java.nio.ByteBuffer;
 import java.security.CodeSource;
@@ -130,6 +131,15 @@
   final HashMap loadedClasses = new HashMap();
 
   /**
+   * Loading constraints registered with this classloader.  This maps
+   * a class name to a weak reference to a class.  When the reference
+   * is non-null, it means that a reference to the name must resolve
+   * to the indicated class.
+   */
+  final HashMap<String, WeakReference<Class>> loadingConstraints
+    = new HashMap<String, WeakReference<Class>>();
+
+  /**
    * All packages defined by this classloader. It is not private in order to
    * allow native code (and trusted subclasses) access to this field.
    */
--- libjava/java/lang/natClassLoader.cc.orig	2008-03-21 22:09:54.249100837 +0100
+++ libjava/java/lang/natClassLoader.cc	2008-03-21 22:10:20.749500589 +0100
@@ -1,6 +1,6 @@
 // natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
 
-/* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006  Free Software Foundation
+/* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -41,6 +41,7 @@
 #include <java/lang/StringBuffer.h>
 #include <java/io/Serializable.h>
 #include <java/lang/Cloneable.h>
+#include <java/lang/ref/WeakReference.h>
 #include <java/util/HashMap.h>
 #include <gnu/gcj/runtime/BootClassLoader.h>
 #include <gnu/gcj/runtime/SystemClassLoader.h>
@@ -143,7 +144,21 @@
       // them later.
       return;
     }
-  loader->loadedClasses->put(klass->name->toString(), klass);
+
+  JvSynchronize sync (loader->loadingConstraints);
+
+  using namespace java::lang::ref;
+
+  jstring name = klass->getName();
+  WeakReference *ref = (WeakReference *) loader->loadingConstraints->get (name);
+  if (ref)
+    {
+      jclass constraint = (jclass) ref->get();
+      if (constraint && constraint != klass)
+	throw new java::lang::LinkageError(JvNewStringLatin1("loading constraint violated"));
+    }
+  loader->loadingConstraints->put(name, new WeakReference(klass));
+  loader->loadedClasses->put(name, klass);
 }
 
 // If we found an error while defining an interpreted class, we must
@@ -156,6 +171,46 @@
   loader->loadedClasses->remove(klass->name->toString());
 }
 
+// Check a loading constraint.  In particular check that, if there is
+// a constraint for the name of KLASS in LOADER, that it maps to
+// KLASS.  If there is no such constraint, make a new one.  If the
+// constraint is violated, throw an exception.  Do nothing for
+// primitive types.
+void
+_Jv_CheckOrCreateLoadingConstraint (jclass klass,
+				    java::lang::ClassLoader *loader)
+{
+  // Strip arrays.
+  while (klass->isArray())
+    klass = klass->getComponentType();
+  // Ignore primitive types.
+  if (klass->isPrimitive())
+    return;
+
+  if (! loader)
+    loader = java::lang::VMClassLoader::bootLoader;
+  jstring name = klass->getName();
+
+  JvSynchronize sync (loader->loadingConstraints);
+
+  using namespace java::lang::ref;
+
+  WeakReference *ref = (WeakReference *) loader->loadingConstraints->get (name);
+  if (ref)
+    {
+      jclass constraint = (jclass) ref->get();
+      if (constraint)
+	{
+	  if (klass != constraint)
+	    throw new java::lang::LinkageError(JvNewStringLatin1("loading constraint violated"));
+	  // Otherwise, all is ok.
+	  return;
+	}
+    }
+  // No constraint (or old constraint GC'd).  Make a new one.
+  loader->loadingConstraints->put(name, new WeakReference(klass));
+}
+
 
 // Class registration.
 //
--- libjava/link.cc.orig	2008-03-21 22:09:54.249100837 +0100
+++ libjava/link.cc	2008-03-21 22:24:51.692638568 +0100
@@ -246,13 +246,9 @@
   if (_Jv_CheckAccess (klass, *found_class, the_field->flags))
     {
       // Note that the field returned by find_field_helper is always
-      // resolved.  There's no point checking class loaders here,
-      // since we already did the work to look up all the types.
-      // FIXME: being lazy here would be nice.
-      if (the_field->type != field_type)
-	throw new java::lang::LinkageError
-	  (JvNewStringLatin1 
-	   ("field type mismatch with different loaders"));
+      // resolved.  However, we still use the constraint mechanism
+      // because this may affect other lookups.
+      _Jv_CheckOrCreateLoadingConstraint (klass, (*found_class)->loader);
     }
   else
     {
@@ -269,6 +265,23 @@
   return the_field;
 }
 
+// Check loading constraints for method.
+void
+_Jv_Linker::check_loading_constraints (_Jv_Method *method, jclass self_class,
+				       jclass other_class)
+{
+  JArray<jclass> *klass_args;
+  jclass klass_return;
+
+  _Jv_GetTypesFromSignature (method, self_class, &klass_args, &klass_return);
+  jclass *klass_arg = elements (klass_args);
+  java::lang::ClassLoader *found_loader = other_class->loader;
+
+  _Jv_CheckOrCreateLoadingConstraint (klass_return, found_loader);
+  for (int i = 0; i < klass_args->length; i++)
+    _Jv_CheckOrCreateLoadingConstraint (*(klass_arg++), found_loader);
+}
+
 _Jv_Method *
 _Jv_Linker::resolve_method_entry (jclass klass, jclass &found_class,
 				  int class_index, int name_and_type_index,
@@ -359,6 +372,11 @@
       throw new java::lang::NoSuchMethodError (sb->toString());
     }
 
+  // if (found_class->loader != klass->loader), then we must actually
+  // check that the types of arguments correspond.  JVMS 5.4.3.3.
+  if (found_class->loader != klass->loader)
+    check_loading_constraints (the_method, klass, found_class);
+
   return the_method;
 }
 
@@ -891,7 +909,8 @@
 	continue;
 
       meth = NULL;
-      for (jclass cl = klass; cl; cl = cl->getSuperclass())
+      jclass cl;
+      for (cl = klass; cl; cl = cl->getSuperclass())
         {
 	  meth = _Jv_GetMethodLocal (cl, iface->methods[j].name,
 				     iface->methods[j].signature);
@@ -913,6 +932,9 @@
 	    itable[pos] = (void *) &_Jv_ThrowAbstractMethodError;
 	  else
 	    itable[pos] = meth->ncode;
+
+	  if (cl->loader != iface->loader)
+	    check_loading_constraints (meth, cl, iface);
 	}
       else
         {
@@ -1467,6 +1489,11 @@
 		  sb->append(_Jv_GetMethodString(declarer, super_meth));
 		  throw new VerifyError(sb->toString());
 		}
+	      else if (declarer->loader != klass->loader)
+		{
+		  // JVMS 5.4.2.
+		  check_loading_constraints (meth, klass, declarer);
+		}
 	    }
 	}
 

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