1 // resolve.cc - Code for linking and resolving classes and pool entries.
3 /* Copyright (C) 1999, 2000, 2001 , 2002 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
11 /* Author: Kresten Krab Thorup <krab@gnu.org> */
15 #include <java-interp.h>
20 #include <java-cpool.h>
21 #include <java/lang/Class.h>
22 #include <java/lang/String.h>
23 #include <java/lang/StringBuffer.h>
24 #include <java/lang/Thread.h>
25 #include <java/lang/InternalError.h>
26 #include <java/lang/VirtualMachineError.h>
27 #include <java/lang/NoSuchFieldError.h>
28 #include <java/lang/NoSuchMethodError.h>
29 #include <java/lang/ClassFormatError.h>
30 #include <java/lang/IllegalAccessError.h>
31 #include <java/lang/AbstractMethodError.h>
32 #include <java/lang/ClassNotFoundException.h>
33 #include <java/lang/IncompatibleClassChangeError.h>
34 #include <java/lang/reflect/Modifier.h>
39 _Jv_ResolveField (_Jv_Field *field, java::lang::ClassLoader *loader)
41 if (! field->isResolved ())
43 _Jv_Utf8Const *sig = (_Jv_Utf8Const*)field->type;
44 field->type = _Jv_FindClassFromSignature (sig->data, loader);
45 field->flags &= ~_Jv_FIELD_UNRESOLVED_FLAG;
51 static void throw_internal_error (char *msg)
52 __attribute__ ((__noreturn__));
53 static void throw_class_format_error (jstring msg)
54 __attribute__ ((__noreturn__));
55 static void throw_class_format_error (char *msg)
56 __attribute__ ((__noreturn__));
58 // Exceptional return values for _Jv_DetermineVTableIndex
59 #define METHOD_NOT_THERE (-2)
60 #define METHOD_INACCESSIBLE (-1)
62 static int get_alignment_from_class (jclass);
64 static _Jv_ResolvedMethod*
65 _Jv_BuildResolvedMethod (_Jv_Method*,
71 static void throw_incompatible_class_change_error (jstring msg)
73 throw new java::lang::IncompatibleClassChangeError (msg);
77 _Jv_ResolvePoolEntry (jclass klass, int index)
79 using namespace java::lang::reflect;
81 _Jv_Constants *pool = &klass->constants;
83 if ((pool->tags[index] & JV_CONSTANT_ResolvedFlag) != 0)
84 return pool->data[index];
86 switch (pool->tags[index]) {
87 case JV_CONSTANT_Class:
89 _Jv_Utf8Const *name = pool->data[index].utf8;
92 if (name->data[0] == '[')
93 found = _Jv_FindClassFromSignature (&name->data[0],
96 found = _Jv_FindClass (name, klass->loader);
100 jstring str = _Jv_NewStringUTF (name->data);
101 throw new java::lang::ClassNotFoundException (str);
104 if ((found->accflags & Modifier::PUBLIC) == Modifier::PUBLIC
105 || (_Jv_ClassNameSamePackage (found->name,
108 pool->data[index].clazz = found;
109 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
113 throw new java::lang::IllegalAccessError (found->getName());
118 case JV_CONSTANT_String:
121 str = _Jv_NewStringUtf8Const (pool->data[index].utf8);
122 pool->data[index].o = str;
123 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
128 case JV_CONSTANT_Fieldref:
130 _Jv_ushort class_index, name_and_type_index;
131 _Jv_loadIndexes (&pool->data[index],
133 name_and_type_index);
134 jclass owner = (_Jv_ResolvePoolEntry (klass, class_index)).clazz;
137 _Jv_InitClass (owner);
139 _Jv_ushort name_index, type_index;
140 _Jv_loadIndexes (&pool->data[name_and_type_index],
144 _Jv_Utf8Const *field_name = pool->data[name_index].utf8;
145 _Jv_Utf8Const *field_type_name = pool->data[type_index].utf8;
147 // FIXME: The implementation of this function
148 // (_Jv_FindClassFromSignature) will generate an instance of
149 // _Jv_Utf8Const for each call if the field type is a class name
150 // (Lxx.yy.Z;). This may be too expensive to do for each and
151 // every fieldref being resolved. For now, we fix the problem by
152 // only doing it when we have a loader different from the class
153 // declaring the field.
155 jclass field_type = 0;
157 if (owner->loader != klass->loader)
158 field_type = _Jv_FindClassFromSignature (field_type_name->data,
161 _Jv_Field* the_field = 0;
163 for (jclass cls = owner; cls != 0; cls = cls->getSuperclass ())
165 for (int i = 0; i < cls->field_count; i++)
167 _Jv_Field *field = &cls->fields[i];
168 if (! _Jv_equalUtf8Consts (field->name, field_name))
171 // now, check field access.
174 || ((field->flags & Modifier::PUBLIC) != 0)
175 || (((field->flags & Modifier::PROTECTED) != 0)
176 && cls->isAssignableFrom (klass))
177 || (((field->flags & Modifier::PRIVATE) == 0)
178 && _Jv_ClassNameSamePackage (cls->name,
181 /* resove the field using the class' own loader
184 if (!field->isResolved ())
185 _Jv_ResolveField (field, cls->loader);
187 if (field_type != 0 && field->type != field_type)
188 throw new java::lang::LinkageError
190 ("field type mismatch with different loaders"));
193 goto end_of_field_search;
197 throw new java::lang::IllegalAccessError;
205 java::lang::StringBuffer *sb = new java::lang::StringBuffer();
206 sb->append(JvNewStringLatin1("field "));
207 sb->append(owner->getName());
208 sb->append(JvNewStringLatin1("."));
209 sb->append(_Jv_NewStringUTF(field_name->data));
210 sb->append(JvNewStringLatin1(" was not found."));
211 throw_incompatible_class_change_error(sb->toString());
214 pool->data[index].field = the_field;
215 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
219 case JV_CONSTANT_Methodref:
220 case JV_CONSTANT_InterfaceMethodref:
222 _Jv_ushort class_index, name_and_type_index;
223 _Jv_loadIndexes (&pool->data[index],
225 name_and_type_index);
226 jclass owner = (_Jv_ResolvePoolEntry (klass, class_index)).clazz;
229 _Jv_InitClass (owner);
231 _Jv_ushort name_index, type_index;
232 _Jv_loadIndexes (&pool->data[name_and_type_index],
236 _Jv_Utf8Const *method_name = pool->data[name_index].utf8;
237 _Jv_Utf8Const *method_signature = pool->data[type_index].utf8;
239 int vtable_index = -1;
240 _Jv_Method *the_method = 0;
241 jclass found_class = 0;
243 // First search the class itself.
244 the_method = _Jv_SearchMethodInClass (owner, klass,
245 method_name, method_signature);
250 goto end_of_method_search;
253 // If we are resolving an interface method, search the interface's
254 // superinterfaces (A superinterface is not an interface's superclass -
255 // a superinterface is implemented by the interface).
256 if (pool->tags[index] == JV_CONSTANT_InterfaceMethodref)
261 ifaces.list = (jclass *) _Jv_Malloc (ifaces.len * sizeof (jclass *));
263 _Jv_GetInterfaces (owner, &ifaces);
265 for (int i=0; i < ifaces.count; i++)
267 jclass cls = ifaces.list[i];
268 the_method = _Jv_SearchMethodInClass (cls, klass, method_name,
277 _Jv_Free (ifaces.list);
280 goto end_of_method_search;
283 // Finally, search superclasses.
284 for (jclass cls = owner->getSuperclass (); cls != 0;
285 cls = cls->getSuperclass ())
287 the_method = _Jv_SearchMethodInClass (cls, klass,
288 method_name, method_signature);
296 end_of_method_search:
298 // FIXME: if (cls->loader != klass->loader), then we
299 // must actually check that the types of arguments
300 // correspond. That is, for each argument type, and
301 // the return type, doing _Jv_FindClassFromSignature
302 // with either loader should produce the same result,
303 // i.e., exactly the same jclass object. JVMS 5.4.3.3
305 if (pool->tags[index] == JV_CONSTANT_InterfaceMethodref)
308 vtable_index = _Jv_DetermineVTableIndex
309 (found_class, method_name, method_signature);
311 if (vtable_index == METHOD_NOT_THERE)
312 throw_incompatible_class_change_error
313 (JvNewStringLatin1 ("method not found"));
317 java::lang::StringBuffer *sb = new java::lang::StringBuffer();
318 sb->append(JvNewStringLatin1("method "));
319 sb->append(owner->getName());
320 sb->append(JvNewStringLatin1("."));
321 sb->append(_Jv_NewStringUTF(method_name->data));
322 sb->append(JvNewStringLatin1(" was not found."));
323 throw new java::lang::NoSuchMethodError (sb->toString());
326 pool->data[index].rmethod =
327 _Jv_BuildResolvedMethod(the_method,
329 (the_method->accflags & Modifier::STATIC) != 0,
331 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
337 return pool->data[index];
340 // Find a method declared in the cls that is referenced from klass and
341 // perform access checks.
343 _Jv_SearchMethodInClass (jclass cls, jclass klass,
344 _Jv_Utf8Const *method_name,
345 _Jv_Utf8Const *method_signature)
347 using namespace java::lang::reflect;
349 for (int i = 0; i < cls->method_count; i++)
351 _Jv_Method *method = &cls->methods[i];
352 if ( (!_Jv_equalUtf8Consts (method->name,
354 || (!_Jv_equalUtf8Consts (method->signature,
359 || ((method->accflags & Modifier::PUBLIC) != 0)
360 || (((method->accflags & Modifier::PROTECTED) != 0)
361 && cls->isAssignableFrom (klass))
362 || (((method->accflags & Modifier::PRIVATE) == 0)
363 && _Jv_ClassNameSamePackage (cls->name,
370 throw new java::lang::IllegalAccessError;
376 /** FIXME: this is a terribly inefficient algorithm! It would improve
377 things if compiled classes to know vtable offset, and _Jv_Method had
380 Returns METHOD_NOT_THERE if this class does not declare the given method.
381 Returns METHOD_INACCESSIBLE if the given method does not appear in the
382 vtable, i.e., it is static, private, final or a constructor.
383 Otherwise, returns the vtable index. */
385 _Jv_DetermineVTableIndex (jclass klass,
387 _Jv_Utf8Const *signature)
389 using namespace java::lang::reflect;
391 jclass super_class = klass->getSuperclass ();
393 if (super_class != NULL)
395 int prev = _Jv_DetermineVTableIndex (super_class,
398 if (prev != METHOD_NOT_THERE)
402 /* at this point, we know that the super-class does not declare
403 * the method. Otherwise, the above call would have found it, and
404 * determined the result of this function (-1 or some positive
408 _Jv_Method *meth = _Jv_GetMethodLocal (klass, name, signature);
410 /* now, if we do not declare this method, return zero */
412 return METHOD_NOT_THERE;
414 /* so now, we know not only that the super class does not declare the
415 * method, but we do! So, this is a first declaration of the method. */
417 /* now, the checks for things that are declared in this class, but do
418 * not go into the vtable. There are three cases.
419 * 1) the method is static, private or final
420 * 2) the class itself is final, or
421 * 3) it is the method <init>
424 if ((meth->accflags & (Modifier::STATIC
426 | Modifier::FINAL)) != 0
427 || (klass->accflags & Modifier::FINAL) != 0
428 || _Jv_equalUtf8Consts (name, init_name))
429 return METHOD_INACCESSIBLE;
431 /* reaching this point, we know for sure, that the method in question
432 * will be in the vtable. The question is where. */
434 /* the base offset, is where we will start assigning vtable
435 * indexes for this class. It is 0 for base classes
436 * and for non-base classes it is the
437 * number of entries in the super class' vtable. */
440 if (super_class == 0)
443 base_offset = super_class->vtable_method_count;
445 /* we will consider methods 0..this_method_index-1. And for each one,
446 * determine if it is new (i.e., if it appears in the super class),
447 * and if it should go in the vtable. If so, increment base_offset */
449 int this_method_index = meth - (&klass->methods[0]);
451 for (int i = 0; i < this_method_index; i++)
453 _Jv_Method *m = &klass->methods[i];
455 /* fist some checks for things that surely do not go in the
458 if ((m->accflags & (Modifier::STATIC | Modifier::PRIVATE)) != 0)
460 if (_Jv_equalUtf8Consts (m->name, init_name))
463 /* Then, we need to know if this method appears in the
464 superclass. (This is where this function gets expensive) */
465 _Jv_Method *sm = _Jv_LookupDeclaredMethod (super_class,
469 /* if it was somehow declared in the superclass, skip this */
473 /* but if it is final, and not declared in the super class,
474 * then we also skip it */
475 if ((m->accflags & Modifier::FINAL) != 0)
478 /* finally, we can assign the index of this method */
479 /* m->vtable_index = base_offset */
486 /* this is installed in place of abstract methods */
488 _Jv_abstractMethodError ()
490 throw new java::lang::AbstractMethodError;
494 _Jv_PrepareClass(jclass klass)
496 using namespace java::lang::reflect;
499 * The job of this function is to: 1) assign storage to fields, and 2)
500 * build the vtable. static fields are assigned real memory, instance
501 * fields are assigned offsets.
503 * NOTE: we have a contract with the garbage collector here. Static
504 * reference fields must not be resolved, until after they have storage
505 * assigned which is the check used by the collector to see if it
506 * should indirect the static field reference and mark the object
509 * Most fields are resolved lazily (i.e. have their class-type
510 * assigned) when they are accessed the first time by calling as part
511 * of _Jv_ResolveField, which is allways called after _Jv_PrepareClass.
512 * Static fields with initializers are resolved as part of this
513 * function, as are fields with primitive types.
516 if (! _Jv_IsInterpretedClass (klass))
519 if (klass->state >= JV_STATE_PREPARED)
522 // Make sure super-class is linked. This involves taking a lock on
523 // the super class, so we use the Java method resolveClass, which
524 // will unlock it properly, should an exception happen. If there's
525 // no superclass, do nothing -- Object will already have been
528 if (klass->superclass)
529 java::lang::ClassLoader::resolveClass0 (klass->superclass);
531 _Jv_InterpClass *clz = (_Jv_InterpClass*)klass;
533 /************ PART ONE: OBJECT LAYOUT ***************/
538 // Although java.lang.Object is never interpreted, an interface can
539 // have a null superclass.
541 instance_size = clz->superclass->size();
543 instance_size = java::lang::Object::class$.size();
546 for (int i = 0; i < clz->field_count; i++)
551 _Jv_Field *field = &clz->fields[i];
553 if (! field->isRef ())
555 // it's safe to resolve the field here, since it's
556 // a primitive class, which does not cause loading to happen.
557 _Jv_ResolveField (field, clz->loader);
559 field_size = field->type->size ();
560 field_align = get_alignment_from_class (field->type);
564 field_size = sizeof (jobject);
565 field_align = __alignof__ (jobject);
568 #ifndef COMPACT_FIELDS
569 field->bsize = field_size;
572 if (field->flags & Modifier::STATIC)
574 /* this computes an offset into a region we'll allocate
575 shortly, and then add this offset to the start address */
577 static_size = ROUND (static_size, field_align);
578 field->u.boffset = static_size;
579 static_size += field_size;
583 instance_size = ROUND (instance_size, field_align);
584 field->u.boffset = instance_size;
585 instance_size += field_size;
589 // set the instance size for the class
590 clz->size_in_bytes = instance_size;
592 // allocate static memory
593 if (static_size != 0)
595 char *static_data = (char*)_Jv_AllocBytes (static_size);
597 memset (static_data, 0, static_size);
599 for (int i = 0; i < clz->field_count; i++)
601 _Jv_Field *field = &clz->fields[i];
603 if ((field->flags & Modifier::STATIC) != 0)
605 field->u.addr = static_data + field->u.boffset;
607 if (clz->field_initializers[i] != 0)
609 _Jv_ResolveField (field, clz->loader);
610 _Jv_InitField (0, clz, i);
615 // now we don't need the field_initializers anymore, so let the
616 // collector get rid of it!
618 clz->field_initializers = 0;
621 /************ PART TWO: VTABLE LAYOUT ***************/
623 /* preparation: build the vtable stubs (even interfaces can)
624 have code -- for static constructors. */
625 for (int i = 0; i < clz->method_count; i++)
627 _Jv_MethodBase *imeth = clz->interpreted_methods[i];
629 if ((clz->methods[i].accflags & Modifier::NATIVE) != 0)
631 // You might think we could use a virtual `ncode' method in
632 // the _Jv_MethodBase and unify the native and non-native
633 // cases. Well, we can't, because we don't allocate these
634 // objects using `new', and thus they don't get a vtable.
635 _Jv_JNIMethod *jnim = reinterpret_cast<_Jv_JNIMethod *> (imeth);
636 clz->methods[i].ncode = jnim->ncode ();
638 else if (imeth != 0) // it could be abstract
640 _Jv_InterpMethod *im = reinterpret_cast<_Jv_InterpMethod *> (imeth);
641 _Jv_VerifyMethod (im);
642 clz->methods[i].ncode = im->ncode ();
646 if (clz->accflags & Modifier::INTERFACE)
648 clz->state = JV_STATE_PREPARED;
653 /* Now onto the actual job: vtable layout. First, count how many new
655 int new_method_count = 0;
657 jclass super_class = clz->getSuperclass ();
659 for (int i = 0; i < clz->method_count; i++)
661 _Jv_Method *this_meth = &clz->methods[i];
663 if ((this_meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) != 0
664 || _Jv_equalUtf8Consts (this_meth->name, init_name))
666 /* skip this, it doesn't go in the vtable */
670 _Jv_Method *orig_meth = _Jv_LookupDeclaredMethod (super_class,
672 this_meth->signature);
676 // new methods that are final, also don't go in the vtable
677 if ((this_meth->accflags & Modifier::FINAL) != 0)
680 new_method_count += 1;
684 if ((orig_meth->accflags & (Modifier::STATIC
686 | Modifier::FINAL)) != 0
687 || ((orig_meth->accflags & Modifier::ABSTRACT) == 0
688 && (this_meth->accflags & Modifier::ABSTRACT) != 0
689 && (klass->accflags & Modifier::ABSTRACT) == 0))
691 clz->state = JV_STATE_ERROR;
693 throw new java::lang::IncompatibleClassChangeError (clz->getName ());
696 /* FIXME: At this point, if (loader != super_class->loader), we
697 * need to "impose class loader constraints" for the types
698 * involved in the signature of this method */
702 int vtable_count = (super_class->vtable_method_count) + new_method_count;
703 clz->vtable_method_count = vtable_count;
705 /* allocate vtable structure */
706 _Jv_VTable *vtable = _Jv_VTable::new_vtable (vtable_count);
708 vtable->gc_descr = _Jv_BuildGCDescr(clz);
711 jclass effective_superclass = super_class;
713 /* If super_class is abstract or an interface it has no vtable.
714 We need to find a real one... */
715 while (effective_superclass && effective_superclass->vtable == NULL)
716 effective_superclass = effective_superclass->superclass;
718 /* If we ended up without a superclass, use Object. */
719 if (! effective_superclass)
720 effective_superclass = &java::lang::Object::class$;
722 /* copy super class' vtable entries. */
723 if (effective_superclass && effective_superclass->vtable)
724 for (int i = 0; i < effective_superclass->vtable_method_count; ++i)
725 vtable->set_method (i, effective_superclass->vtable->get_method (i));
728 /* now, install our own vtable entries, reprise... */
729 for (int i = 0; i < clz->method_count; i++)
731 _Jv_Method *this_meth = &clz->methods[i];
733 int index = _Jv_DetermineVTableIndex (clz,
735 this_meth->signature);
737 if (index == METHOD_NOT_THERE)
738 throw_internal_error ("method now found in own class");
740 if (index != METHOD_INACCESSIBLE)
742 if (index > clz->vtable_method_count)
743 throw_internal_error ("vtable problem...");
745 if (clz->interpreted_methods[i] == 0)
746 vtable->set_method(index, (void*)&_Jv_abstractMethodError);
748 vtable->set_method(index, this_meth->ncode);
752 /* finally, assign the vtable! */
753 clz->vtable = vtable;
755 /* wooha! we're done. */
756 clz->state = JV_STATE_PREPARED;
760 /** Do static initialization for fields with a constant initializer */
762 _Jv_InitField (jobject obj, jclass klass, int index)
764 using namespace java::lang::reflect;
766 if (obj != 0 && klass == 0)
767 klass = obj->getClass ();
769 if (!_Jv_IsInterpretedClass (klass))
772 _Jv_InterpClass *clz = (_Jv_InterpClass*)klass;
774 _Jv_Field * field = (&clz->fields[0]) + index;
776 if (index > clz->field_count)
777 throw_internal_error ("field out of range");
779 int init = clz->field_initializers[index];
783 _Jv_Constants *pool = &clz->constants;
784 int tag = pool->tags[init];
786 if (! field->isResolved ())
787 throw_internal_error ("initializing unresolved field");
789 if (obj==0 && ((field->flags & Modifier::STATIC) == 0))
790 throw_internal_error ("initializing non-static field with no object");
794 if ((field->flags & Modifier::STATIC) != 0)
795 addr = (void*) field->u.addr;
797 addr = (void*) (((char*)obj) + field->u.boffset);
801 case JV_CONSTANT_String:
803 _Jv_MonitorEnter (clz);
805 str = _Jv_NewStringUtf8Const (pool->data[init].utf8);
806 pool->data[init].string = str;
807 pool->tags[init] = JV_CONSTANT_ResolvedString;
808 _Jv_MonitorExit (clz);
812 case JV_CONSTANT_ResolvedString:
813 if (! (field->type == &StringClass
814 || field->type == &java::lang::Class::class$))
815 throw_class_format_error ("string initialiser to non-string field");
817 *(jstring*)addr = pool->data[init].string;
820 case JV_CONSTANT_Integer:
822 int value = pool->data[init].i;
824 if (field->type == JvPrimClass (boolean))
825 *(jboolean*)addr = (jboolean)value;
827 else if (field->type == JvPrimClass (byte))
828 *(jbyte*)addr = (jbyte)value;
830 else if (field->type == JvPrimClass (char))
831 *(jchar*)addr = (jchar)value;
833 else if (field->type == JvPrimClass (short))
834 *(jshort*)addr = (jshort)value;
836 else if (field->type == JvPrimClass (int))
837 *(jint*)addr = (jint)value;
840 throw_class_format_error ("erroneous field initializer");
844 case JV_CONSTANT_Long:
845 if (field->type != JvPrimClass (long))
846 throw_class_format_error ("erroneous field initializer");
848 *(jlong*)addr = _Jv_loadLong (&pool->data[init]);
851 case JV_CONSTANT_Float:
852 if (field->type != JvPrimClass (float))
853 throw_class_format_error ("erroneous field initializer");
855 *(jfloat*)addr = pool->data[init].f;
858 case JV_CONSTANT_Double:
859 if (field->type != JvPrimClass (double))
860 throw_class_format_error ("erroneous field initializer");
862 *(jdouble*)addr = _Jv_loadDouble (&pool->data[init]);
866 throw_class_format_error ("erroneous field initializer");
871 get_alignment_from_class (jclass klass)
873 if (klass == JvPrimClass (byte))
874 return __alignof__ (jbyte);
875 else if (klass == JvPrimClass (short))
876 return __alignof__ (jshort);
877 else if (klass == JvPrimClass (int))
878 return __alignof__ (jint);
879 else if (klass == JvPrimClass (long))
880 return __alignof__ (jlong);
881 else if (klass == JvPrimClass (boolean))
882 return __alignof__ (jboolean);
883 else if (klass == JvPrimClass (char))
884 return __alignof__ (jchar);
885 else if (klass == JvPrimClass (float))
886 return __alignof__ (jfloat);
887 else if (klass == JvPrimClass (double))
888 return __alignof__ (jdouble);
890 return __alignof__ (jobject);
894 inline static unsigned char*
895 skip_one_type (unsigned char* ptr)
906 do { ch = *ptr++; } while (ch != ';');
913 get_ffi_type_from_signature (unsigned char* ptr)
919 return &ffi_type_pointer;
923 // On some platforms a bool is a byte, on others an int.
924 if (sizeof (jboolean) == sizeof (jbyte))
925 return &ffi_type_sint8;
928 JvAssert (sizeof (jbyte) == sizeof (jint));
929 return &ffi_type_sint32;
934 return &ffi_type_sint8;
938 return &ffi_type_uint16;
942 return &ffi_type_sint16;
946 return &ffi_type_sint32;
950 return &ffi_type_sint64;
954 return &ffi_type_float;
958 return &ffi_type_double;
962 return &ffi_type_void;
966 throw_internal_error ("unknown type in signature");
969 /* this function yields the number of actual arguments, that is, if the
970 * function is non-static, then one is added to the number of elements
971 * found in the signature */
974 _Jv_count_arguments (_Jv_Utf8Const *signature,
977 unsigned char *ptr = (unsigned char*) signature->data;
978 int arg_count = staticp ? 0 : 1;
980 /* first, count number of arguments */
988 ptr = skip_one_type (ptr);
995 /* This beast will build a cif, given the signature. Memory for
996 * the cif itself and for the argument types must be allocated by the
1001 init_cif (_Jv_Utf8Const* signature,
1005 ffi_type **arg_types,
1008 unsigned char *ptr = (unsigned char*) signature->data;
1010 int arg_index = 0; // arg number
1011 int item_count = 0; // stack-item count
1016 arg_types[arg_index++] = &ffi_type_pointer;
1026 arg_types[arg_index++] = get_ffi_type_from_signature (ptr);
1028 if (*ptr == 'J' || *ptr == 'D')
1033 ptr = skip_one_type (ptr);
1038 ffi_type *rtype = get_ffi_type_from_signature (ptr);
1040 ptr = skip_one_type (ptr);
1041 if (ptr != (unsigned char*)signature->data + signature->length)
1042 throw_internal_error ("did not find end of signature");
1044 if (ffi_prep_cif (cif, FFI_DEFAULT_ABI,
1045 arg_count, rtype, arg_types) != FFI_OK)
1046 throw_internal_error ("ffi_prep_cif failed");
1048 if (rtype_p != NULL)
1054 #if FFI_NATIVE_RAW_API
1055 # define FFI_PREP_RAW_CLOSURE ffi_prep_raw_closure
1056 # define FFI_RAW_SIZE ffi_raw_size
1058 # define FFI_PREP_RAW_CLOSURE ffi_prep_java_raw_closure
1059 # define FFI_RAW_SIZE ffi_java_raw_size
1062 /* we put this one here, and not in interpret.cc because it
1063 * calls the utility routines _Jv_count_arguments
1064 * which are static to this module. The following struct defines the
1065 * layout we use for the stubs, it's only used in the ncode method. */
1068 ffi_raw_closure closure;
1070 ffi_type *arg_types[0];
1073 typedef void (*ffi_closure_fun) (ffi_cif*,void*,ffi_raw*,void*);
1076 _Jv_InterpMethod::ncode ()
1078 using namespace java::lang::reflect;
1080 if (self->ncode != 0)
1083 jboolean staticp = (self->accflags & Modifier::STATIC) != 0;
1084 int arg_count = _Jv_count_arguments (self->signature, staticp);
1086 ncode_closure *closure =
1087 (ncode_closure*)_Jv_AllocBytes (sizeof (ncode_closure)
1088 + arg_count * sizeof (ffi_type*));
1090 init_cif (self->signature,
1094 &closure->arg_types[0],
1097 ffi_closure_fun fun;
1099 args_raw_size = FFI_RAW_SIZE (&closure->cif);
1101 JvAssert ((self->accflags & Modifier::NATIVE) == 0);
1103 if ((self->accflags & Modifier::SYNCHRONIZED) != 0)
1106 fun = (ffi_closure_fun)&_Jv_InterpMethod::run_synch_class;
1108 fun = (ffi_closure_fun)&_Jv_InterpMethod::run_synch_object;
1112 fun = (ffi_closure_fun)&_Jv_InterpMethod::run_normal;
1115 FFI_PREP_RAW_CLOSURE (&closure->closure,
1120 self->ncode = (void*)closure;
1126 _Jv_JNIMethod::ncode ()
1128 using namespace java::lang::reflect;
1130 if (self->ncode != 0)
1133 jboolean staticp = (self->accflags & Modifier::STATIC) != 0;
1134 int arg_count = _Jv_count_arguments (self->signature, staticp);
1136 ncode_closure *closure =
1137 (ncode_closure*)_Jv_AllocBytes (sizeof (ncode_closure)
1138 + arg_count * sizeof (ffi_type*));
1141 init_cif (self->signature,
1145 &closure->arg_types[0],
1148 ffi_closure_fun fun;
1150 args_raw_size = FFI_RAW_SIZE (&closure->cif);
1152 // Initialize the argument types and CIF that represent the actual
1153 // underlying JNI function.
1155 if ((self->accflags & Modifier::STATIC))
1157 jni_arg_types = (ffi_type **) _Jv_Malloc ((extra_args + arg_count)
1158 * sizeof (ffi_type *));
1160 jni_arg_types[offset++] = &ffi_type_pointer;
1161 if ((self->accflags & Modifier::STATIC))
1162 jni_arg_types[offset++] = &ffi_type_pointer;
1163 memcpy (&jni_arg_types[offset], &closure->arg_types[0],
1164 arg_count * sizeof (ffi_type *));
1166 if (ffi_prep_cif (&jni_cif, FFI_DEFAULT_ABI,
1167 extra_args + arg_count, rtype,
1168 jni_arg_types) != FFI_OK)
1169 throw_internal_error ("ffi_prep_cif failed for JNI function");
1171 JvAssert ((self->accflags & Modifier::NATIVE) != 0);
1173 // FIXME: for now we assume that all native methods for
1174 // interpreted code use JNI.
1175 fun = (ffi_closure_fun) &_Jv_JNIMethod::call;
1177 FFI_PREP_RAW_CLOSURE (&closure->closure,
1182 self->ncode = (void *) closure;
1187 /* A _Jv_ResolvedMethod is what is put in the constant pool for a
1188 * MethodRef or InterfacemethodRef. */
1189 static _Jv_ResolvedMethod*
1190 _Jv_BuildResolvedMethod (_Jv_Method* method,
1195 int arg_count = _Jv_count_arguments (method->signature, staticp);
1197 _Jv_ResolvedMethod* result = (_Jv_ResolvedMethod*)
1198 _Jv_AllocBytes (sizeof (_Jv_ResolvedMethod)
1199 + arg_count*sizeof (ffi_type*));
1201 result->stack_item_count
1202 = init_cif (method->signature,
1206 &result->arg_types[0],
1209 result->vtable_index = vtable_index;
1210 result->method = method;
1211 result->klass = klass;
1218 throw_class_format_error (jstring msg)
1221 ? new java::lang::ClassFormatError (msg)
1222 : new java::lang::ClassFormatError);
1226 throw_class_format_error (char *msg)
1228 throw_class_format_error (JvNewStringLatin1 (msg));
1232 throw_internal_error (char *msg)
1234 throw new java::lang::InternalError (JvNewStringLatin1 (msg));
1238 #endif /* INTERPRETER */