1 // resolve.cc - Code for linking and resolving classes and pool entries.
3 /* Copyright (C) 1999, 2000 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/Thread.h>
24 #include <java/lang/InternalError.h>
25 #include <java/lang/VirtualMachineError.h>
26 #include <java/lang/NoSuchFieldError.h>
27 #include <java/lang/NoSuchMethodError.h>
28 #include <java/lang/ClassFormatError.h>
29 #include <java/lang/IllegalAccessError.h>
30 #include <java/lang/AbstractMethodError.h>
31 #include <java/lang/ClassNotFoundException.h>
32 #include <java/lang/IncompatibleClassChangeError.h>
33 #include <java/lang/reflect/Modifier.h>
37 static void throw_internal_error (char *msg
)
38 __attribute__ ((__noreturn__
));
39 static void throw_class_format_error (jstring msg
)
40 __attribute__ ((__noreturn__
));
41 static void throw_class_format_error (char *msg
)
42 __attribute__ ((__noreturn__
));
44 #define ClassObject _CL_Q34java4lang6Object
45 extern java::lang::Class ClassObject
;
46 #define ObjectClass _CL_Q34java4lang6Object
47 extern java::lang::Class ObjectClass
;
50 static int get_alignment_from_class (jclass
);
52 static _Jv_ResolvedMethod
*
53 _Jv_BuildResolvedMethod (_Jv_Method
*,
59 // We need to know the name of a constructor.
60 static _Jv_Utf8Const
*init_name
= _Jv_makeUtf8Const ("<init>", 6);
62 static void throw_incompatible_class_change_error (jstring msg
)
64 JvThrow (new java::lang::IncompatibleClassChangeError (msg
));
68 _Jv_ResolvePoolEntry (jclass klass
, int index
)
70 using namespace java::lang::reflect
;
72 _Jv_Constants
*pool
= &klass
->constants
;
74 if ((pool
->tags
[index
] & JV_CONSTANT_ResolvedFlag
) != 0)
75 return pool
->data
[index
];
77 switch (pool
->tags
[index
]) {
78 case JV_CONSTANT_Class
:
80 _Jv_Utf8Const
*name
= pool
->data
[index
].utf8
;
83 if (name
->data
[0] == '[')
84 found
= _Jv_FindClassFromSignature (&name
->data
[0],
87 found
= _Jv_FindClass (name
, klass
->loader
);
91 jstring str
= _Jv_NewStringUTF (name
->data
);
92 JvThrow (new java::lang::ClassNotFoundException (str
));
95 if ((found
->accflags
& Modifier::PUBLIC
) == Modifier::PUBLIC
96 || (_Jv_ClassNameSamePackage (found
->name
,
99 pool
->data
[index
].clazz
= found
;
100 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
104 JvThrow (new java::lang::IllegalAccessError (found
->getName()));
109 case JV_CONSTANT_String
:
112 str
= _Jv_NewStringUtf8Const (pool
->data
[index
].utf8
);
113 pool
->data
[index
].o
= str
;
114 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
119 case JV_CONSTANT_Fieldref
:
121 _Jv_ushort class_index
, name_and_type_index
;
122 _Jv_loadIndexes (&pool
->data
[index
],
124 name_and_type_index
);
125 jclass owner
= (_Jv_ResolvePoolEntry (klass
, class_index
)).clazz
;
128 _Jv_InitClass (owner
);
130 _Jv_ushort name_index
, type_index
;
131 _Jv_loadIndexes (&pool
->data
[name_and_type_index
],
135 _Jv_Utf8Const
*field_name
= pool
->data
[name_index
].utf8
;
136 _Jv_Utf8Const
*field_type_name
= pool
->data
[type_index
].utf8
;
138 // FIXME: The implementation of this function
139 // (_Jv_FindClassFromSignature) will generate an instance of
140 // _Jv_Utf8Const for each call if the field type is a class name
141 // (Lxx.yy.Z;). This may be too expensive to do for each and
142 // every fieldref being resolved. For now, we fix the problem by
143 // only doing it when we have a loader different from the class
144 // declaring the field.
146 jclass field_type
= 0;
148 if (owner
->loader
!= klass
->loader
)
149 field_type
= _Jv_FindClassFromSignature (field_type_name
->data
,
152 _Jv_Field
* the_field
= 0;
154 for (jclass cls
= owner
; cls
!= 0; cls
= cls
->getSuperclass ())
156 for (int i
= 0; i
< cls
->field_count
; i
++)
158 _Jv_Field
*field
= &cls
->fields
[i
];
159 if (! _Jv_equalUtf8Consts (field
->name
, field_name
))
162 // now, check field access.
165 || ((field
->flags
& Modifier::PUBLIC
) != 0)
166 || (((field
->flags
& Modifier::PROTECTED
) != 0)
167 && cls
->isAssignableFrom (klass
))
168 || (((field
->flags
& Modifier::PRIVATE
) == 0)
169 && _Jv_ClassNameSamePackage (cls
->name
,
172 /* resove the field using the class' own loader
175 if (!field
->isResolved ())
176 _Jv_ResolveField (field
, cls
->loader
);
178 if (field_type
!= 0 && field
->type
!= field_type
)
180 (new java::lang::LinkageError
182 ("field type mismatch with different loaders")));
185 goto end_of_field_search
;
189 JvThrow (new java::lang::IllegalAccessError
);
197 jstring msg
= JvNewStringLatin1 ("field ");
198 msg
= msg
->concat (owner
->getName ());
199 msg
= msg
->concat (JvNewStringLatin1("."));
200 msg
= msg
->concat (_Jv_NewStringUTF (field_name
->data
));
201 msg
= msg
->concat (JvNewStringLatin1(" was not found."));
202 throw_incompatible_class_change_error (msg
);
205 pool
->data
[index
].field
= the_field
;
206 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
210 case JV_CONSTANT_Methodref
:
211 case JV_CONSTANT_InterfaceMethodref
:
213 _Jv_ushort class_index
, name_and_type_index
;
214 _Jv_loadIndexes (&pool
->data
[index
],
216 name_and_type_index
);
217 jclass owner
= (_Jv_ResolvePoolEntry (klass
, class_index
)).clazz
;
220 _Jv_InitClass (owner
);
222 _Jv_ushort name_index
, type_index
;
223 _Jv_loadIndexes (&pool
->data
[name_and_type_index
],
227 _Jv_Utf8Const
*method_name
= pool
->data
[name_index
].utf8
;
228 _Jv_Utf8Const
*method_signature
= pool
->data
[type_index
].utf8
;
230 int vtable_index
= -1;
231 _Jv_Method
*the_method
= 0;
232 jclass found_class
= 0;
234 // First search the class itself.
235 the_method
= _Jv_SearchMethodInClass (owner
, klass
,
236 method_name
, method_signature
);
241 goto end_of_method_search
;
244 // If we are resolving an interface method, search the interface's
245 // superinterfaces (A superinterface is not an interface's superclass -
246 // a superinterface is implemented by the interface).
247 if (pool
->tags
[index
] == JV_CONSTANT_InterfaceMethodref
)
252 ifaces
.list
= (jclass
*) _Jv_Malloc (ifaces
.len
* sizeof (jclass
*));
254 _Jv_GetInterfaces (owner
, &ifaces
);
256 for (int i
=0; i
< ifaces
.count
; i
++)
258 jclass cls
= ifaces
.list
[i
];
259 the_method
= _Jv_SearchMethodInClass (cls
, klass
, method_name
,
268 _Jv_Free (ifaces
.list
);
271 goto end_of_method_search
;
274 // Finally, search superclasses.
275 for (jclass cls
= owner
->getSuperclass (); cls
!= 0;
276 cls
= cls
->getSuperclass ())
278 the_method
= _Jv_SearchMethodInClass (cls
, klass
,
279 method_name
, method_signature
);
287 end_of_method_search
:
289 // FIXME: if (cls->loader != klass->loader), then we
290 // must actually check that the types of arguments
291 // correspond. That is, for each argument type, and
292 // the return type, doing _Jv_FindClassFromSignature
293 // with either loader should produce the same result,
294 // i.e., exactly the same jclass object. JVMS 5.4.3.3
296 if (pool
->tags
[index
] == JV_CONSTANT_InterfaceMethodref
)
299 vtable_index
= _Jv_DetermineVTableIndex
300 (found_class
, method_name
, method_signature
);
302 if (vtable_index
== 0)
303 throw_incompatible_class_change_error
304 (JvNewStringLatin1 ("method not found"));
308 jstring msg
= JvNewStringLatin1 ("method ");
309 msg
= msg
->concat (owner
->getName ());
310 msg
= msg
->concat (JvNewStringLatin1("."));
311 msg
= msg
->concat (_Jv_NewStringUTF (method_name
->data
));
312 msg
= msg
->concat (JvNewStringLatin1(" was not found."));
313 JvThrow(new java::lang::NoSuchMethodError (msg
));
316 pool
->data
[index
].rmethod
=
317 _Jv_BuildResolvedMethod(the_method
,
319 (the_method
->accflags
& Modifier::STATIC
) != 0,
321 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
327 return pool
->data
[index
];
330 // Find a method declared in the cls that is referenced from klass and
331 // perform access checks.
333 _Jv_SearchMethodInClass (jclass cls
, jclass klass
,
334 _Jv_Utf8Const
*method_name
,
335 _Jv_Utf8Const
*method_signature
)
337 using namespace java::lang::reflect
;
339 for (int i
= 0; i
< cls
->method_count
; i
++)
341 _Jv_Method
*method
= &cls
->methods
[i
];
342 if ( (!_Jv_equalUtf8Consts (method
->name
,
344 || (!_Jv_equalUtf8Consts (method
->signature
,
349 || ((method
->accflags
& Modifier::PUBLIC
) != 0)
350 || (((method
->accflags
& Modifier::PROTECTED
) != 0)
351 && cls
->isAssignableFrom (klass
))
352 || (((method
->accflags
& Modifier::PRIVATE
) == 0)
353 && _Jv_ClassNameSamePackage (cls
->name
,
360 JvThrow (new java::lang::IllegalAccessError
);
367 _Jv_ResolveField (_Jv_Field
*field
, java::lang::ClassLoader
*loader
)
369 if (! field
->isResolved ())
371 _Jv_Utf8Const
*sig
= (_Jv_Utf8Const
*)field
->type
;
372 field
->type
= _Jv_FindClassFromSignature (sig
->data
, loader
);
373 field
->flags
&= ~_Jv_FIELD_UNRESOLVED_FLAG
;
377 /** FIXME: this is a terribly inefficient algorithm! It would improve
378 things if compiled classes to know vtable offset, and _Jv_Method had
381 Returns 0 if this class does not declare the given method.
382 Returns -1 if the given method does not appear in the vtable.
383 i.e., it is static, private, final or a constructor.
384 Otherwise, returns the vtable index. */
386 _Jv_DetermineVTableIndex (jclass klass
,
388 _Jv_Utf8Const
*signature
)
390 using namespace java::lang::reflect
;
392 jclass super_class
= klass
->getSuperclass ();
394 if (super_class
!= NULL
)
396 int prev
= _Jv_DetermineVTableIndex (super_class
,
403 /* at this point, we know that the super-class does not declare
404 * the method. Otherwise, the above call would have found it, and
405 * determined the result of this function (-1 or some positive
409 _Jv_Method
*meth
= _Jv_GetMethodLocal (klass
, name
, signature
);
411 /* now, if we do not declare this method, return zero */
415 /* so now, we know not only that the super class does not declare the
416 * method, but we do! So, this is a first declaration of the method. */
418 /* now, the checks for things that are declared in this class, but do
419 * not go into the vtable. There are three cases.
420 * 1) the method is static, private or final
421 * 2) the class itself is final, or
422 * 3) it is the method <init>
425 if ((meth
->accflags
& (Modifier::STATIC
427 | Modifier::FINAL
)) != 0
428 || (klass
->accflags
& Modifier::FINAL
) != 0
429 || _Jv_equalUtf8Consts (name
, init_name
))
432 /* reaching this point, we know for sure, that the method in question
433 * will be in the vtable. The question is where. */
435 /* the base offset, is where we will start assigning vtable
436 * indexes for this class. It is 1 for base classes
437 * (vtable->method[0] is unused), and for non-base classes it is the
438 * number of entries in the super class' vtable plus 1. */
441 if (super_class
== 0)
444 base_offset
= super_class
->vtable_method_count
+1;
446 /* we will consider methods 0..this_method_index-1. And for each one,
447 * determine if it is new (i.e., if it appears in the super class),
448 * and if it should go in the vtable. If so, increment base_offset */
450 int this_method_index
= meth
- (&klass
->methods
[0]);
452 for (int i
= 0; i
< this_method_index
; i
++)
454 _Jv_Method
*m
= &klass
->methods
[i
];
456 /* fist some checks for things that surely do not go in the
459 if ((m
->accflags
& (Modifier::STATIC
| Modifier::PRIVATE
)) != 0)
461 if (_Jv_equalUtf8Consts (m
->name
, init_name
))
464 /* Then, we need to know if this method appears in the
465 superclass. (This is where this function gets expensive) */
466 _Jv_Method
*sm
= _Jv_LookupDeclaredMethod (super_class
,
470 /* if it was somehow declared in the superclass, skip this */
474 /* but if it is final, and not declared in the super class,
475 * then we also skip it */
476 if ((m
->accflags
& Modifier::FINAL
) != 0)
479 /* finally, we can assign the index of this method */
480 /* m->vtable_index = base_offset */
487 /* this is installed in place of abstract methods */
489 _Jv_abstractMethodError ()
491 JvThrow (new java::lang::AbstractMethodError
);
495 _Jv_PrepareClass(jclass klass
)
497 using namespace java::lang::reflect
;
500 * The job of this function is to: 1) assign storage to fields, and 2)
501 * build the vtable. static fields are assigned real memory, instance
502 * fields are assigned offsets.
504 * NOTE: we have a contract with the garbage collector here. Static
505 * reference fields must not be resolved, until after they have storage
506 * assigned which is the check used by the collector to see if it
507 * should indirect the static field reference and mark the object
510 * Most fields are resolved lazily (i.e. have their class-type
511 * assigned) when they are accessed the first time by calling as part
512 * of _Jv_ResolveField, which is allways called after _Jv_PrepareClass.
513 * Static fields with initializers are resolved as part of this
514 * function, as are fields with primitive types.
517 if (! _Jv_IsInterpretedClass (klass
))
520 if (klass
->state
>= JV_STATE_PREPARED
)
523 // make sure super-class is linked. This involves taking a lock on
524 // the super class, so we use the Java method resolveClass, which will
525 // unlock it properly, should an exception happen.
527 java::lang::ClassLoader::resolveClass0 (klass
->superclass
);
529 _Jv_InterpClass
*clz
= (_Jv_InterpClass
*)klass
;
531 /************ PART ONE: OBJECT LAYOUT ***************/
536 // java.lang.Object is never interpreted!
537 instance_size
= clz
->superclass
->size ();
540 for (int i
= 0; i
< clz
->field_count
; i
++)
545 _Jv_Field
*field
= &clz
->fields
[i
];
547 if (! field
->isRef ())
549 // it's safe to resolve the field here, since it's
550 // a primitive class, which does not cause loading to happen.
551 _Jv_ResolveField (field
, clz
->loader
);
553 field_size
= field
->type
->size ();
554 field_align
= get_alignment_from_class (field
->type
);
558 field_size
= sizeof (jobject
);
559 field_align
= __alignof__ (jobject
);
562 #ifndef COMPACT_FIELDS
563 field
->bsize
= field_size
;
566 if (field
->flags
& Modifier::STATIC
)
568 /* this computes an offset into a region we'll allocate
569 shortly, and then add this offset to the start address */
571 static_size
= ROUND (static_size
, field_align
);
572 field
->u
.boffset
= static_size
;
573 static_size
+= field_size
;
577 instance_size
= ROUND (instance_size
, field_align
);
578 field
->u
.boffset
= instance_size
;
579 instance_size
+= field_size
;
583 // set the instance size for the class
584 clz
->size_in_bytes
= instance_size
;
586 // allocate static memory
587 if (static_size
!= 0)
589 char *static_data
= (char*)_Jv_AllocBytesChecked (static_size
);
591 memset (static_data
, 0, static_size
);
593 for (int i
= 0; i
< clz
->field_count
; i
++)
595 _Jv_Field
*field
= &clz
->fields
[i
];
597 if ((field
->flags
& Modifier::STATIC
) != 0)
599 field
->u
.addr
= static_data
+ field
->u
.boffset
;
601 if (clz
->field_initializers
[i
] != 0)
603 _Jv_ResolveField (field
, clz
->loader
);
604 _Jv_InitField (0, clz
, i
);
609 // now we don't need the field_initializers anymore, so let the
610 // collector get rid of it!
612 clz
->field_initializers
= 0;
615 /************ PART TWO: VTABLE LAYOUT ***************/
617 /* preparation: build the vtable stubs (even interfaces can)
618 have code -- for static constructors. */
619 for (int i
= 0; i
< clz
->method_count
; i
++)
621 _Jv_MethodBase
*imeth
= clz
->interpreted_methods
[i
];
623 if ((clz
->methods
[i
].accflags
& Modifier::NATIVE
) != 0)
625 // You might think we could use a virtual `ncode' method in
626 // the _Jv_MethodBase and unify the native and non-native
627 // cases. Well, we can't, because we don't allocate these
628 // objects using `new', and thus they don't get a vtable.
629 _Jv_JNIMethod
*jnim
= reinterpret_cast<_Jv_JNIMethod
*> (imeth
);
630 clz
->methods
[i
].ncode
= jnim
->ncode ();
632 else if (imeth
!= 0) // it could be abstract
634 _Jv_InterpMethod
*im
= reinterpret_cast<_Jv_InterpMethod
*> (imeth
);
635 clz
->methods
[i
].ncode
= im
->ncode ();
639 if (clz
->accflags
& Modifier::INTERFACE
)
641 clz
->state
= JV_STATE_PREPARED
;
646 /* Now onto the actual job: vtable layout. First, count how many new
648 int new_method_count
= 0;
650 jclass super_class
= clz
->getSuperclass ();
652 if (super_class
== 0)
653 throw_internal_error ("cannot handle interpreted base classes");
655 for (int i
= 0; i
< clz
->method_count
; i
++)
657 _Jv_Method
*this_meth
= &clz
->methods
[i
];
659 if ((this_meth
->accflags
& (Modifier::STATIC
| Modifier::PRIVATE
)) != 0
660 || _Jv_equalUtf8Consts (this_meth
->name
, init_name
))
662 /* skip this, it doesn't go in the vtable */
666 _Jv_Method
*orig_meth
= _Jv_LookupDeclaredMethod (super_class
,
668 this_meth
->signature
);
672 // new methods that are final, also don't go in the vtable
673 if ((this_meth
->accflags
& Modifier::FINAL
) != 0)
676 new_method_count
+= 1;
680 if ((orig_meth
->accflags
& (Modifier::STATIC
682 | Modifier::FINAL
)) != 0
683 || ((orig_meth
->accflags
& Modifier::ABSTRACT
) == 0
684 && (this_meth
->accflags
& Modifier::ABSTRACT
) != 0
685 && (klass
->accflags
& Modifier::ABSTRACT
) == 0))
687 clz
->state
= JV_STATE_ERROR
;
689 JvThrow (new java::lang::IncompatibleClassChangeError
693 /* FIXME: At this point, if (loader != super_class->loader), we
694 * need to "impose class loader constraints" for the types
695 * involved in the signature of this method */
699 int vtable_count
= (super_class
->vtable_method_count
) + new_method_count
;
700 clz
->vtable_method_count
= vtable_count
;
702 /* allocate vtable structure */
703 _Jv_VTable
*vtable
= (_Jv_VTable
*)
704 _Jv_AllocBytesChecked (sizeof (_Jv_VTable
)
705 + (sizeof (void*) * (vtable_count
)));
709 jclass effective_superclass
= super_class
;
711 /* If super_class is abstract or an interface it has no vtable.
712 We need to find a real one... */
713 while (effective_superclass
&& effective_superclass
->vtable
== NULL
)
714 effective_superclass
= effective_superclass
->superclass
;
716 /* copy super class' vtable entries (index 0 goes unused). */
717 if (effective_superclass
&& effective_superclass
->vtable
)
718 memcpy ((void*)&vtable
->method
[1],
719 (void*)&effective_superclass
->vtable
->method
[1],
720 sizeof (void*) * effective_superclass
->vtable_method_count
);
723 /* now, install our own vtable entries, reprise... */
724 for (int i
= 0; i
< clz
->method_count
; i
++)
726 _Jv_Method
*this_meth
= &clz
->methods
[i
];
728 int index
= _Jv_DetermineVTableIndex (clz
,
730 this_meth
->signature
);
733 throw_internal_error ("method now found in own class");
737 if (index
> clz
->vtable_method_count
+1)
738 throw_internal_error ("vtable problem...");
740 if (clz
->interpreted_methods
[i
] == 0)
741 vtable
->method
[index
] = (void*)&_Jv_abstractMethodError
;
743 vtable
->method
[index
] = this_meth
->ncode
;
747 /* finally, assign the vtable! */
748 clz
->vtable
= vtable
;
750 /* wooha! we're done. */
751 clz
->state
= JV_STATE_PREPARED
;
755 /** Do static initialization for fields with a constant initializer */
757 _Jv_InitField (jobject obj
, jclass klass
, int index
)
759 using namespace java::lang::reflect
;
761 if (obj
!= 0 && klass
== 0)
762 klass
= obj
->getClass ();
764 if (!_Jv_IsInterpretedClass (klass
))
767 _Jv_InterpClass
*clz
= (_Jv_InterpClass
*)klass
;
769 _Jv_Field
* field
= (&clz
->fields
[0]) + index
;
771 if (index
> clz
->field_count
)
772 throw_internal_error ("field out of range");
774 int init
= clz
->field_initializers
[index
];
778 _Jv_Constants
*pool
= &clz
->constants
;
779 int tag
= pool
->tags
[init
];
781 if (! field
->isResolved ())
782 throw_internal_error ("initializing unresolved field");
784 if (obj
==0 && ((field
->flags
& Modifier::STATIC
) == 0))
785 throw_internal_error ("initializing non-static field with no object");
789 if ((field
->flags
& Modifier::STATIC
) != 0)
790 addr
= (void*) field
->u
.addr
;
792 addr
= (void*) (((char*)obj
) + field
->u
.boffset
);
796 case JV_CONSTANT_String
:
798 _Jv_MonitorEnter (clz
);
800 str
= _Jv_NewStringUtf8Const (pool
->data
[init
].utf8
);
801 pool
->data
[init
].string
= str
;
802 pool
->tags
[init
] = JV_CONSTANT_ResolvedString
;
803 _Jv_MonitorExit (clz
);
807 case JV_CONSTANT_ResolvedString
:
808 if (! (field
->type
== &StringClass
|| field
->type
== &ObjectClass
))
809 throw_class_format_error ("string initialiser to non-string field");
811 *(jstring
*)addr
= pool
->data
[init
].string
;
814 case JV_CONSTANT_Integer
:
816 int value
= pool
->data
[init
].i
;
818 if (field
->type
== JvPrimClass (boolean
))
819 *(jboolean
*)addr
= (jboolean
)value
;
821 else if (field
->type
== JvPrimClass (byte
))
822 *(jbyte
*)addr
= (jbyte
)value
;
824 else if (field
->type
== JvPrimClass (char))
825 *(jchar
*)addr
= (jchar
)value
;
827 else if (field
->type
== JvPrimClass (short))
828 *(jshort
*)addr
= (jshort
)value
;
830 else if (field
->type
== JvPrimClass (int))
831 *(jint
*)addr
= (jint
)value
;
834 throw_class_format_error ("erroneous field initializer");
838 case JV_CONSTANT_Long
:
839 if (field
->type
!= JvPrimClass (long))
840 throw_class_format_error ("erroneous field initializer");
842 *(jlong
*)addr
= _Jv_loadLong (&pool
->data
[init
]);
845 case JV_CONSTANT_Float
:
846 if (field
->type
!= JvPrimClass (float))
847 throw_class_format_error ("erroneous field initializer");
849 *(jfloat
*)addr
= pool
->data
[init
].f
;
852 case JV_CONSTANT_Double
:
853 if (field
->type
!= JvPrimClass (double))
854 throw_class_format_error ("erroneous field initializer");
856 *(jdouble
*)addr
= _Jv_loadDouble (&pool
->data
[init
]);
860 throw_class_format_error ("erroneous field initializer");
865 get_alignment_from_class (jclass klass
)
867 if (klass
== JvPrimClass (byte
))
868 return __alignof__ (jbyte
);
869 else if (klass
== JvPrimClass (short))
870 return __alignof__ (jshort
);
871 else if (klass
== JvPrimClass (int))
872 return __alignof__ (jint
);
873 else if (klass
== JvPrimClass (long))
874 return __alignof__ (jlong
);
875 else if (klass
== JvPrimClass (boolean
))
876 return __alignof__ (jboolean
);
877 else if (klass
== JvPrimClass (char))
878 return __alignof__ (jchar
);
879 else if (klass
== JvPrimClass (float))
880 return __alignof__ (jfloat
);
881 else if (klass
== JvPrimClass (double))
882 return __alignof__ (jdouble
);
884 return __alignof__ (jobject
);
888 inline static unsigned char*
889 skip_one_type (unsigned char* ptr
)
900 do { ch
= *ptr
++; } while (ch
!= ';');
907 get_ffi_type_from_signature (unsigned char* ptr
)
913 return &ffi_type_pointer
;
917 // On some platforms a bool is a byte, on others an int.
918 if (sizeof (jboolean
) == sizeof (jbyte
))
919 return &ffi_type_sint8
;
922 JvAssert (sizeof (jbyte
) == sizeof (jint
));
923 return &ffi_type_sint32
;
928 return &ffi_type_sint8
;
932 return &ffi_type_uint16
;
936 return &ffi_type_sint16
;
940 return &ffi_type_sint32
;
944 return &ffi_type_sint64
;
948 return &ffi_type_float
;
952 return &ffi_type_double
;
956 return &ffi_type_void
;
960 throw_internal_error ("unknown type in signature");
963 /* this function yields the number of actual arguments, that is, if the
964 * function is non-static, then one is added to the number of elements
965 * found in the signature */
968 count_arguments (_Jv_Utf8Const
*signature
,
971 unsigned char *ptr
= (unsigned char*) signature
->data
;
972 int arg_count
= staticp
? 0 : 1;
974 /* first, count number of arguments */
982 ptr
= skip_one_type (ptr
);
989 /* This beast will build a cif, given the signature. Memory for
990 * the cif itself and for the argument types must be allocated by the
995 init_cif (_Jv_Utf8Const
* signature
,
999 ffi_type
**arg_types
,
1002 unsigned char *ptr
= (unsigned char*) signature
->data
;
1004 int arg_index
= 0; // arg number
1005 int item_count
= 0; // stack-item count
1010 arg_types
[arg_index
++] = &ffi_type_pointer
;
1020 arg_types
[arg_index
++] = get_ffi_type_from_signature (ptr
);
1022 if (*ptr
== 'J' || *ptr
== 'D')
1027 ptr
= skip_one_type (ptr
);
1032 ffi_type
*rtype
= get_ffi_type_from_signature (ptr
);
1034 ptr
= skip_one_type (ptr
);
1035 if (ptr
!= (unsigned char*)signature
->data
+ signature
->length
)
1036 throw_internal_error ("did not find end of signature");
1038 if (ffi_prep_cif (cif
, FFI_DEFAULT_ABI
,
1039 arg_count
, rtype
, arg_types
) != FFI_OK
)
1040 throw_internal_error ("ffi_prep_cif failed");
1042 if (rtype_p
!= NULL
)
1048 #if FFI_NATIVE_RAW_API
1049 # define FFI_PREP_RAW_CLOSURE ffi_prep_raw_closure
1050 # define FFI_RAW_SIZE ffi_raw_size
1052 # define FFI_PREP_RAW_CLOSURE ffi_prep_java_raw_closure
1053 # define FFI_RAW_SIZE ffi_java_raw_size
1056 /* we put this one here, and not in interpret.cc because it
1057 * calls the utility routines count_arguments
1058 * which are static to this module. The following struct defines the
1059 * layout we use for the stubs, it's only used in the ncode method. */
1062 ffi_raw_closure closure
;
1064 ffi_type
*arg_types
[0];
1067 typedef void (*ffi_closure_fun
) (ffi_cif
*,void*,ffi_raw
*,void*);
1070 _Jv_InterpMethod::ncode ()
1072 using namespace java::lang::reflect
;
1074 if (self
->ncode
!= 0)
1077 jboolean staticp
= (self
->accflags
& Modifier::STATIC
) != 0;
1078 int arg_count
= count_arguments (self
->signature
, staticp
);
1080 ncode_closure
*closure
=
1081 (ncode_closure
*)_Jv_AllocBytesChecked (sizeof (ncode_closure
)
1082 + arg_count
* sizeof (ffi_type
*));
1084 init_cif (self
->signature
,
1088 &closure
->arg_types
[0],
1091 ffi_closure_fun fun
;
1093 args_raw_size
= FFI_RAW_SIZE (&closure
->cif
);
1095 JvAssert ((self
->accflags
& Modifier::NATIVE
) == 0);
1097 if ((self
->accflags
& Modifier::SYNCHRONIZED
) != 0)
1100 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_synch_class
;
1102 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_synch_object
;
1106 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_normal
;
1109 FFI_PREP_RAW_CLOSURE (&closure
->closure
,
1114 self
->ncode
= (void*)closure
;
1120 _Jv_JNIMethod::ncode ()
1122 using namespace java::lang::reflect
;
1124 if (self
->ncode
!= 0)
1127 jboolean staticp
= (self
->accflags
& Modifier::STATIC
) != 0;
1128 int arg_count
= count_arguments (self
->signature
, staticp
);
1130 ncode_closure
*closure
=
1131 (ncode_closure
*)_Jv_AllocBytesChecked (sizeof (ncode_closure
)
1132 + arg_count
* sizeof (ffi_type
*));
1135 init_cif (self
->signature
,
1139 &closure
->arg_types
[0],
1142 ffi_closure_fun fun
;
1144 args_raw_size
= FFI_RAW_SIZE (&closure
->cif
);
1146 // Initialize the argument types and CIF that represent the actual
1147 // underlying JNI function.
1149 if ((self
->accflags
& Modifier::STATIC
))
1151 jni_arg_types
= (ffi_type
**) _Jv_Malloc ((extra_args
+ arg_count
)
1152 * sizeof (ffi_type
*));
1154 jni_arg_types
[offset
++] = &ffi_type_pointer
;
1155 if ((self
->accflags
& Modifier::STATIC
))
1156 jni_arg_types
[offset
++] = &ffi_type_pointer
;
1157 memcpy (&jni_arg_types
[offset
], &closure
->arg_types
[0],
1158 arg_count
* sizeof (ffi_type
*));
1160 if (ffi_prep_cif (&jni_cif
, FFI_DEFAULT_ABI
,
1161 extra_args
+ arg_count
, rtype
,
1162 jni_arg_types
) != FFI_OK
)
1163 throw_internal_error ("ffi_prep_cif failed for JNI function");
1165 JvAssert ((self
->accflags
& Modifier::NATIVE
) != 0);
1167 // FIXME: for now we assume that all native methods for
1168 // interpreted code use JNI.
1169 fun
= (ffi_closure_fun
) &_Jv_JNIMethod::call
;
1171 FFI_PREP_RAW_CLOSURE (&closure
->closure
,
1176 self
->ncode
= (void *) closure
;
1181 /* A _Jv_ResolvedMethod is what is put in the constant pool for a
1182 * MethodRef or InterfacemethodRef. */
1183 static _Jv_ResolvedMethod
*
1184 _Jv_BuildResolvedMethod (_Jv_Method
* method
,
1189 int arg_count
= count_arguments (method
->signature
, staticp
);
1191 _Jv_ResolvedMethod
* result
= (_Jv_ResolvedMethod
*)
1192 _Jv_AllocBytesChecked (sizeof (_Jv_ResolvedMethod
)
1193 + arg_count
*sizeof (ffi_type
*));
1195 result
->stack_item_count
1196 = init_cif (method
->signature
,
1200 &result
->arg_types
[0],
1203 result
->vtable_index
= vtable_index
;
1204 result
->method
= method
;
1205 result
->klass
= klass
;
1212 throw_class_format_error (jstring msg
)
1215 JvThrow (new java::lang::ClassFormatError
);
1217 JvThrow (new java::lang::ClassFormatError (msg
));
1221 throw_class_format_error (char *msg
)
1223 throw_class_format_error (JvNewStringLatin1 (msg
));
1227 throw_internal_error (char *msg
)
1230 (new java::lang::InternalError (JvNewStringLatin1 (msg
)));
1234 #endif /* INTERPRETER */