602 lines
16 KiB
C++
602 lines
16 KiB
C++
// natClass.cc - Implementation of java.lang.Class native methods.
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/* Copyright (C) 1998, 1999 Cygnus Solutions
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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 <stdlib.h>
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#include <string.h>
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#pragma implementation "Class.h"
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <java/lang/Class.h>
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#include <java/lang/ClassLoader.h>
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#include <java/lang/String.h>
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#include <java/lang/reflect/Modifier.h>
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#include <java/lang/reflect/Member.h>
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#include <java/lang/reflect/Method.h>
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#include <java/lang/reflect/Field.h>
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#include <java/lang/reflect/Constructor.h>
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#include <java/lang/AbstractMethodError.h>
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#include <java/lang/ClassNotFoundException.h>
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#include <java/lang/IllegalAccessException.h>
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#include <java/lang/IllegalAccessError.h>
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#include <java/lang/IncompatibleClassChangeError.h>
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#include <java/lang/InstantiationException.h>
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#include <java/lang/NoClassDefFoundError.h>
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#include <java/lang/NoSuchFieldException.h>
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#include <java/lang/NoSuchMethodException.h>
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#include <java/lang/Thread.h>
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#include <java/lang/NullPointerException.h>
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#include <java/lang/System.h>
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#include <java/lang/SecurityManager.h>
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#include <java-cpool.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 ErrorClass _CL_Q34java4lang5Error
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extern java::lang::Class ErrorClass;
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#define ClassClass _CL_Q34java4lang5Class
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extern java::lang::Class ClassClass;
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#define MethodClass _CL_Q44java4lang7reflect6Method
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extern java::lang::Class MethodClass;
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#define FieldClass _CL_Q44java4lang7reflect5Field
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extern java::lang::Class FieldClass;
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// Some constants we use to look up the class initializer.
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static _Jv_Utf8Const *void_signature = _Jv_makeUtf8Const ("()V", 3);
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static _Jv_Utf8Const *clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
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static _Jv_Utf8Const *init_name = _Jv_makeUtf8Const ("<init>", 6);
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jclass
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java::lang::Class::forName (jstring className)
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{
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if (! className)
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JvThrow (new java::lang::NullPointerException);
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#if 0
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// FIXME: should check syntax of CLASSNAME and throw
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// IllegalArgumentException on failure.
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// FIXME: should use class loader from calling method.
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jclass klass = _Jv_FindClass (className, NULL);
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#else
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jsize length = _Jv_GetStringUTFLength (className);
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char buffer[length];
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_Jv_GetStringUTFRegion (className, 0, length, buffer);
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// FIXME: should check syntax of CLASSNAME and throw
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// IllegalArgumentException on failure.
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_Jv_Utf8Const *name = _Jv_makeUtf8Const (buffer, length);
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// FIXME: should use class loader from calling method.
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jclass klass = (buffer[0] == '['
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? _Jv_FindClassFromSignature (name->data, NULL)
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: _Jv_FindClass (name, NULL));
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#endif
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if (! klass)
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JvThrow (new java::lang::ClassNotFoundException (className));
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return klass;
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}
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java::lang::reflect::Constructor *
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java::lang::Class::getConstructor (JArray<jclass> *)
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{
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JvFail ("java::lang::Class::getConstructor not implemented");
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}
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JArray<java::lang::reflect::Constructor *> *
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java::lang::Class::getConstructors (void)
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{
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JvFail ("java::lang::Class::getConstructors not implemented");
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}
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java::lang::reflect::Constructor *
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java::lang::Class::getDeclaredConstructor (JArray<jclass> *)
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{
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JvFail ("java::lang::Class::getDeclaredConstructor not implemented");
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}
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JArray<java::lang::reflect::Constructor *> *
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java::lang::Class::getDeclaredConstructors (void)
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{
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JvFail ("java::lang::Class::getDeclaredConstructors not implemented");
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}
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java::lang::reflect::Field *
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java::lang::Class::getField (jstring name, jint hash)
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{
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java::lang::reflect::Field* rfield;
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for (int i = 0; i < field_count; i++)
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{
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_Jv_Field *field = &fields[i];
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if (! _Jv_equal (field->name, name, hash))
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continue;
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if (! (field->getModifiers() & java::lang::reflect::Modifier::PUBLIC))
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continue;
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rfield = new java::lang::reflect::Field ();
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rfield->offset = (char*) field - (char*) fields;
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rfield->declaringClass = this;
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rfield->name = name;
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return rfield;
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}
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jclass superclass = getSuperclass();
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if (superclass == NULL)
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return NULL;
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rfield = superclass->getField(name, hash);
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for (int i = 0; i < interface_count && rfield == NULL; ++i)
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rfield = interfaces[i]->getField (name, hash);
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return rfield;
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}
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java::lang::reflect::Field *
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java::lang::Class::getDeclaredField (jstring name)
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{
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java::lang::SecurityManager *s = java::lang::System::getSecurityManager();
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if (s != NULL)
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s->checkMemberAccess (this, java::lang::reflect::Member::DECLARED);
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int hash = name->hashCode();
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for (int i = 0; i < field_count; i++)
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{
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_Jv_Field *field = &fields[i];
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if (! _Jv_equal (field->name, name, hash))
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continue;
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java::lang::reflect::Field* rfield = new java::lang::reflect::Field ();
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rfield->offset = (char*) field - (char*) fields;
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rfield->declaringClass = this;
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rfield->name = name;
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return rfield;
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}
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JvThrow (new java::lang::NoSuchFieldException (name));
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}
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JArray<java::lang::reflect::Field *> *
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java::lang::Class::getDeclaredFields (void)
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{
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java::lang::SecurityManager *s = java::lang::System::getSecurityManager();
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if (s != NULL)
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s->checkMemberAccess (this, java::lang::reflect::Member::DECLARED);
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JArray<java::lang::reflect::Field *> *result
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= (JArray<java::lang::reflect::Field *> *)
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JvNewObjectArray (field_count, &FieldClass, NULL);
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java::lang::reflect::Field** fptr = elements (result);
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for (int i = 0; i < field_count; i++)
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{
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_Jv_Field *field = &fields[i];
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java::lang::reflect::Field* rfield = new java::lang::reflect::Field ();
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rfield->offset = (char*) field - (char*) fields;
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rfield->declaringClass = this;
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*fptr++ = rfield;
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}
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return result;
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}
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java::lang::reflect::Method *
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java::lang::Class::getDeclaredMethod (jstring, JArray<jclass> *)
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{
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JvFail ("java::lang::Class::getDeclaredMethod not implemented");
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}
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JArray<java::lang::reflect::Method *> *
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java::lang::Class::getDeclaredMethods (void)
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{
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int numMethods = 0;
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int i;
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for (i = method_count; --i >= 0; )
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{
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_Jv_Method *method = &methods[i];
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if (method->name == NULL
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|| _Jv_equalUtf8Consts (method->name, clinit_name)
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|| _Jv_equalUtf8Consts (method->name, init_name))
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continue;
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numMethods++;
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}
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JArray<java::lang::reflect::Method *> *result
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= (JArray<java::lang::reflect::Method *> *)
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JvNewObjectArray (numMethods, &MethodClass, NULL);
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java::lang::reflect::Method** mptr = elements (result);
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for (i = 0; i < method_count; i++)
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{
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_Jv_Method *method = &methods[i];
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if (method->name == NULL
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|| _Jv_equalUtf8Consts (method->name, clinit_name)
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|| _Jv_equalUtf8Consts (method->name, init_name))
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continue;
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java::lang::reflect::Method* rmethod = new java::lang::reflect::Method ();
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rmethod->offset = (char*) mptr - (char*) elements (result);
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rmethod->declaringClass = this;
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*mptr++ = rmethod;
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}
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return result;
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}
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jstring
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java::lang::Class::getName (void)
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{
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char buffer[name->length + 1];
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memcpy (buffer, name->data, name->length);
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buffer[name->length] = '\0';
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return _Jv_NewStringUTF (buffer);
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}
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JArray<jclass> *
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java::lang::Class::getClasses (void)
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{
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// FIXME: implement.
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return NULL;
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}
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JArray<jclass> *
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java::lang::Class::getDeclaredClasses (void)
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{
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checkMemberAccess (java::lang::reflect::Member::DECLARED);
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JvFail ("java::lang::Class::getDeclaredClasses not implemented");
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return NULL; // Placate compiler.
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}
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// This is marked as unimplemented in the JCL book.
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jclass
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java::lang::Class::getDeclaringClass (void)
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{
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JvFail ("java::lang::Class::getDeclaringClass unimplemented");
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return NULL; // Placate compiler.
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}
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JArray<java::lang::reflect::Field *> *
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java::lang::Class::getFields (void)
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{
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JvFail ("java::lang::Class::getFields not implemented");
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}
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JArray<jclass> *
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java::lang::Class::getInterfaces (void)
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{
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jobjectArray r = JvNewObjectArray (interface_count, getClass (), NULL);
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jobject *data = elements (r);
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for (int i = 0; i < interface_count; ++i)
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data[i] = interfaces[i];
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return reinterpret_cast<JArray<jclass> *> (r);
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}
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java::lang::reflect::Method *
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java::lang::Class::getMethod (jstring, JArray<jclass> *)
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{
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JvFail ("java::lang::Class::getMethod not implemented");
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}
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JArray<java::lang::reflect::Method *> *
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java::lang::Class::getMethods (void)
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{
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JvFail ("java::lang::Class::getMethods not implemented");
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}
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jboolean
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java::lang::Class::isAssignableFrom (jclass klass)
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{
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if (this == klass)
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return true;
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// Primitive types must be equal, which we just tested for.
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if (isPrimitive () || ! klass || klass->isPrimitive())
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return false;
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// If target is array, so must source be.
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if (isArray ())
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{
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if (! klass->isArray())
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return false;
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return getComponentType()->isAssignableFrom(klass->getComponentType());
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}
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if (isAssignableFrom (klass->getSuperclass()))
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return true;
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if (isInterface())
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{
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// See if source implements this interface.
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for (int i = 0; i < klass->interface_count; ++i)
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{
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jclass interface = klass->interfaces[i];
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// FIXME: ensure that class is prepared here.
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// See Spec 12.3.2.
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if (isAssignableFrom (interface))
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return true;
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}
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}
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return false;
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}
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jboolean
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java::lang::Class::isInstance (jobject obj)
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{
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if (! obj || isPrimitive ())
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return false;
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return isAssignableFrom (obj->getClass());
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}
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jboolean
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java::lang::Class::isInterface (void)
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{
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return (accflags & java::lang::reflect::Modifier::INTERFACE) != 0;
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}
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jobject
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java::lang::Class::newInstance (void)
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{
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// FIXME: do accessibility checks here. There currently doesn't
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// seem to be any way to do these.
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// FIXME: we special-case one check here just to pass a Plum Hall
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// test. Once access checking is implemented, remove this.
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if (this == &ClassClass)
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JvThrow (new java::lang::IllegalAccessException);
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if (isPrimitive ()
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|| isInterface ()
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|| java::lang::reflect::Modifier::isAbstract(accflags))
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JvThrow (new java::lang::InstantiationException);
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_Jv_InitClass (this);
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_Jv_Method *meth = _Jv_GetMethodLocal (this, init_name, void_signature);
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if (! meth)
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JvThrow (new java::lang::NoSuchMethodException);
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jobject r = JvAllocObject (this);
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((void (*) (jobject)) meth->ncode) (r);
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return r;
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}
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void
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java::lang::Class::finalize (void)
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{
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#ifdef INTERPRETER
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JvAssert (_Jv_IsInterpretedClass (this));
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_Jv_UnregisterClass (this);
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#endif
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}
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// FIXME.
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void
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java::lang::Class::hackRunInitializers (void)
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{
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_Jv_Method *meth = _Jv_GetMethodLocal (this, clinit_name, void_signature);
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if (meth)
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((void (*) (void)) meth->ncode) ();
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}
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// This implements the initialization process for a class. From Spec
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// section 12.4.2.
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void
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java::lang::Class::initializeClass (void)
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{
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// Short-circuit to avoid needless locking.
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if (state == JV_STATE_DONE)
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return;
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// do this before we enter the monitor below, since this can cause
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// exceptions. Here we assume, that reading "state" is an atomic
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// operation, I pressume that is true? --Kresten
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if (state < JV_STATE_LINKED)
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{
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#ifdef INTERPRETER
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if (_Jv_IsInterpretedClass (this))
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{
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java::lang::ClassLoader::resolveClass0 (this);
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// Step 1.
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_Jv_MonitorEnter (this);
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}
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else
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#endif
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{
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// Step 1.
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_Jv_MonitorEnter (this);
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_Jv_PrepareCompiledClass (this);
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}
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}
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else
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{
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// Step 1.
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_Jv_MonitorEnter (this);
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}
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// Step 2.
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java::lang::Thread *self = java::lang::Thread::currentThread();
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// FIXME: `self' can be null at startup. Hence this nasty trick.
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self = (java::lang::Thread *) ((long) self | 1);
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while (state == JV_STATE_IN_PROGRESS && thread && thread != self)
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wait ();
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// Steps 3 & 4.
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if (state == JV_STATE_DONE || state == JV_STATE_IN_PROGRESS || thread == self)
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{
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_Jv_MonitorExit (this);
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return;
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}
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// Step 5.
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if (state == JV_STATE_ERROR)
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{
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_Jv_MonitorExit (this);
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JvThrow (new java::lang::NoClassDefFoundError);
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}
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// Step 6.
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thread = self;
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state = JV_STATE_IN_PROGRESS;
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_Jv_MonitorExit (this);
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// Step 7.
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if (! isInterface () && superclass)
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{
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// FIXME: We can't currently catch a Java exception in C++ code.
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// So instead we call a Java trampoline. It returns an
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// exception, or null.
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jobject except = superclass->hackTrampoline(0, NULL);
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if (except)
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{
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// Caught an exception.
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_Jv_MonitorEnter (this);
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state = JV_STATE_ERROR;
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notifyAll ();
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_Jv_MonitorExit (this);
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JvThrow (except);
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}
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}
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// Step 8.
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// FIXME: once again we have to go through a trampoline.
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java::lang::Throwable *except = hackTrampoline (1, NULL);
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// Steps 9, 10, 11.
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if (! except)
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{
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_Jv_MonitorEnter (this);
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state = JV_STATE_DONE;
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}
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else
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{
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if (! ErrorClass.isInstance(except))
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{
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// Once again we must use the trampoline. In this case we
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// have to detect an OutOfMemoryError.
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except = hackTrampoline(2, except);
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}
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_Jv_MonitorEnter (this);
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state = JV_STATE_ERROR;
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}
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notifyAll ();
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_Jv_MonitorExit (this);
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if (except)
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JvThrow (except);
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}
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//
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// Some class-related convenience functions.
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//
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_Jv_Method *
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_Jv_GetMethodLocal (jclass klass, _Jv_Utf8Const *name,
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_Jv_Utf8Const *signature)
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{
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for (int i = 0; i < klass->method_count; ++i)
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{
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if (_Jv_equalUtf8Consts (name, klass->methods[i].name)
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&& _Jv_equalUtf8Consts (signature, klass->methods[i].signature))
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return &klass->methods[i];
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}
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return NULL;
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}
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// NOTE: MCACHE_SIZE should be a power of 2 minus one.
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#define MCACHE_SIZE 1023
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struct _Jv_mcache
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{
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jclass klass;
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_Jv_Method *method;
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};
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static _Jv_mcache method_cache[MCACHE_SIZE + 1];
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static void *
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_Jv_FindMethodInCache (jclass klass,
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_Jv_Utf8Const *name,
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_Jv_Utf8Const *signature)
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{
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int index = name->hash & MCACHE_SIZE;
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_Jv_mcache *mc = method_cache + index;
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_Jv_Method *m = mc->method;
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|
||
if (mc->klass == klass
|
||
&& m != NULL // thread safe check
|
||
&& _Jv_equalUtf8Consts (m->name, name)
|
||
&& _Jv_equalUtf8Consts (m->signature, signature))
|
||
return mc->method->ncode;
|
||
return NULL;
|
||
}
|
||
|
||
static void
|
||
_Jv_AddMethodToCache (jclass klass,
|
||
_Jv_Method *method)
|
||
{
|
||
_Jv_MonitorEnter (&ClassClass);
|
||
|
||
int index = method->name->hash & MCACHE_SIZE;
|
||
|
||
method_cache[index].method = method;
|
||
method_cache[index].klass = klass;
|
||
|
||
_Jv_MonitorExit (&ClassClass);
|
||
}
|
||
|
||
void *
|
||
_Jv_LookupInterfaceMethod (jclass klass, _Jv_Utf8Const *name,
|
||
_Jv_Utf8Const *signature)
|
||
{
|
||
// FIXME: can't do this until we have a working class loader.
|
||
// This probably isn't the right thing to do anyway, since we can't
|
||
// call a method of a class until the class is linked. But this
|
||
// captures the general idea.
|
||
// klass->getClassLoader()->resolveClass(klass);
|
||
//
|
||
// KKT: This is unnessecary, exactly for the reason you present:
|
||
// _Jv_LookupInterfaceMethod is only called on object instances, and
|
||
// such have already been initialized (which includes resolving).
|
||
|
||
void *ncode = _Jv_FindMethodInCache (klass, name, signature);
|
||
if (ncode != 0)
|
||
return ncode;
|
||
|
||
for (; klass; klass = klass->getSuperclass())
|
||
{
|
||
_Jv_Method *meth = _Jv_GetMethodLocal (klass, name, signature);
|
||
if (! meth)
|
||
continue;
|
||
|
||
if (java::lang::reflect::Modifier::isStatic(meth->accflags))
|
||
JvThrow (new java::lang::IncompatibleClassChangeError);
|
||
if (java::lang::reflect::Modifier::isAbstract(meth->accflags))
|
||
JvThrow (new java::lang::AbstractMethodError);
|
||
if (! java::lang::reflect::Modifier::isPublic(meth->accflags))
|
||
JvThrow (new java::lang::IllegalAccessError);
|
||
|
||
_Jv_AddMethodToCache (klass, meth);
|
||
|
||
return meth->ncode;
|
||
}
|
||
JvThrow (new java::lang::IncompatibleClassChangeError);
|
||
return NULL; // Placate compiler.
|
||
}
|
||
|
||
void
|
||
_Jv_InitClass (jclass klass)
|
||
{
|
||
klass->initializeClass();
|
||
}
|
||
|
||
jboolean
|
||
_Jv_IsInstanceOf(jobject obj, jclass cl)
|
||
{
|
||
return cl->isInstance(obj);
|
||
}
|