1 // link.cc - Code for linking and resolving classes and pool entries.
3 /* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005 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> */
16 #include <java-interp.h>
22 #include <java-cpool.h>
23 #include <execution.h>
24 #include <java/lang/Class.h>
25 #include <java/lang/String.h>
26 #include <java/lang/StringBuffer.h>
27 #include <java/lang/Thread.h>
28 #include <java/lang/InternalError.h>
29 #include <java/lang/VirtualMachineError.h>
30 #include <java/lang/VerifyError.h>
31 #include <java/lang/NoSuchFieldError.h>
32 #include <java/lang/NoSuchMethodError.h>
33 #include <java/lang/ClassFormatError.h>
34 #include <java/lang/IllegalAccessError.h>
35 #include <java/lang/AbstractMethodError.h>
36 #include <java/lang/NoClassDefFoundError.h>
37 #include <java/lang/IncompatibleClassChangeError.h>
38 #include <java/lang/VerifyError.h>
39 #include <java/lang/VMClassLoader.h>
40 #include <java/lang/reflect/Modifier.h>
41 #include <java/security/CodeSource.h>
45 // When true, print debugging information about class loading.
46 bool gcj::verbose_class_flag
;
48 typedef unsigned int uaddr
__attribute__ ((mode (pointer
)));
57 #define ALIGNOF(TYPE) (offsetof (aligner<TYPE>, field))
59 // This returns the alignment of a type as it would appear in a
60 // structure. This can be different from the alignment of the type
61 // itself. For instance on x86 double is 8-aligned but struct{double}
64 _Jv_Linker::get_alignment_from_class (jclass klass
)
66 if (klass
== JvPrimClass (byte
))
67 return ALIGNOF (jbyte
);
68 else if (klass
== JvPrimClass (short))
69 return ALIGNOF (jshort
);
70 else if (klass
== JvPrimClass (int))
71 return ALIGNOF (jint
);
72 else if (klass
== JvPrimClass (long))
73 return ALIGNOF (jlong
);
74 else if (klass
== JvPrimClass (boolean
))
75 return ALIGNOF (jboolean
);
76 else if (klass
== JvPrimClass (char))
77 return ALIGNOF (jchar
);
78 else if (klass
== JvPrimClass (float))
79 return ALIGNOF (jfloat
);
80 else if (klass
== JvPrimClass (double))
81 return ALIGNOF (jdouble
);
83 return ALIGNOF (jobject
);
87 _Jv_Linker::resolve_field (_Jv_Field
*field
, java::lang::ClassLoader
*loader
)
89 if (! field
->isResolved ())
91 _Jv_Utf8Const
*sig
= (_Jv_Utf8Const
*)field
->type
;
92 field
->type
= _Jv_FindClassFromSignature (sig
->chars(), loader
);
93 field
->flags
&= ~_Jv_FIELD_UNRESOLVED_FLAG
;
97 // A helper for find_field that knows how to recursively search
98 // superclasses and interfaces.
100 _Jv_Linker::find_field_helper (jclass search
, _Jv_Utf8Const
*name
,
105 // From 5.4.3.2. First search class itself.
106 for (int i
= 0; i
< search
->field_count
; ++i
)
108 _Jv_Field
*field
= &search
->fields
[i
];
109 if (_Jv_equalUtf8Consts (field
->name
, name
))
116 // Next search direct interfaces.
117 for (int i
= 0; i
< search
->interface_count
; ++i
)
119 _Jv_Field
*result
= find_field_helper (search
->interfaces
[i
], name
,
125 // Now search superclass.
126 search
= search
->superclass
;
133 // KLASS is the class that is requesting the field.
134 // OWNER is the class in which the field should be found.
135 // FIELD_TYPE_NAME is the type descriptor for the field.
136 // This function does the class loader type checks, and
137 // also access checks. Returns the field, or throws an
138 // exception on error.
140 _Jv_Linker::find_field (jclass klass
, jclass owner
,
141 _Jv_Utf8Const
*field_name
,
142 _Jv_Utf8Const
*field_type_name
)
144 jclass field_type
= 0;
146 if (owner
->loader
!= klass
->loader
)
148 // FIXME: The implementation of this function
149 // (_Jv_FindClassFromSignature) will generate an instance of
150 // _Jv_Utf8Const for each call if the field type is a class name
151 // (Lxx.yy.Z;). This may be too expensive to do for each and
152 // every fieldref being resolved. For now, we fix the problem
153 // by only doing it when we have a loader different from the
154 // class declaring the field.
155 field_type
= _Jv_FindClassFromSignature (field_type_name
->chars(),
159 jclass found_class
= 0;
160 _Jv_Field
*the_field
= find_field_helper (owner
, field_name
, &found_class
);
164 java::lang::StringBuffer
*sb
= new java::lang::StringBuffer();
165 sb
->append(JvNewStringLatin1("field "));
166 sb
->append(owner
->getName());
167 sb
->append(JvNewStringLatin1("."));
168 sb
->append(_Jv_NewStringUTF(field_name
->chars()));
169 sb
->append(JvNewStringLatin1(" was not found."));
170 throw new java::lang::NoSuchFieldError (sb
->toString());
173 if (_Jv_CheckAccess (klass
, found_class
, the_field
->flags
))
175 // Resolve the field using the class' own loader if necessary.
177 if (!the_field
->isResolved ())
178 resolve_field (the_field
, found_class
->loader
);
180 if (field_type
!= 0 && the_field
->type
!= field_type
)
181 throw new java::lang::LinkageError
183 ("field type mismatch with different loaders"));
187 java::lang::StringBuffer
*sb
188 = new java::lang::StringBuffer ();
189 sb
->append(klass
->getName());
190 sb
->append(JvNewStringLatin1(": "));
191 sb
->append(found_class
->getName());
192 sb
->append(JvNewStringLatin1("."));
193 sb
->append(_Jv_NewStringUtf8Const (field_name
));
194 throw new java::lang::IllegalAccessError(sb
->toString());
201 _Jv_Linker::resolve_pool_entry (jclass klass
, int index
)
203 using namespace java::lang::reflect
;
205 _Jv_Constants
*pool
= &klass
->constants
;
207 if ((pool
->tags
[index
] & JV_CONSTANT_ResolvedFlag
) != 0)
208 return pool
->data
[index
];
210 switch (pool
->tags
[index
])
212 case JV_CONSTANT_Class
:
214 _Jv_Utf8Const
*name
= pool
->data
[index
].utf8
;
217 if (name
->first() == '[')
218 found
= _Jv_FindClassFromSignature (name
->chars(),
221 found
= _Jv_FindClass (name
, klass
->loader
);
224 throw new java::lang::NoClassDefFoundError (name
->toString());
226 // Check accessibility, but first strip array types as
227 // _Jv_ClassNameSamePackage can't handle arrays.
230 check
&& check
->isArray();
231 check
= check
->getComponentType())
233 if ((found
->accflags
& Modifier::PUBLIC
) == Modifier::PUBLIC
234 || (_Jv_ClassNameSamePackage (check
->name
,
237 pool
->data
[index
].clazz
= found
;
238 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
242 java::lang::StringBuffer
*sb
= new java::lang::StringBuffer ();
243 sb
->append(klass
->getName());
244 sb
->append(JvNewStringLatin1(" can't access class "));
245 sb
->append(found
->getName());
246 throw new java::lang::IllegalAccessError(sb
->toString());
251 case JV_CONSTANT_String
:
254 str
= _Jv_NewStringUtf8Const (pool
->data
[index
].utf8
);
255 pool
->data
[index
].o
= str
;
256 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
260 case JV_CONSTANT_Fieldref
:
262 _Jv_ushort class_index
, name_and_type_index
;
263 _Jv_loadIndexes (&pool
->data
[index
],
265 name_and_type_index
);
266 jclass owner
= (resolve_pool_entry (klass
, class_index
)).clazz
;
269 _Jv_InitClass (owner
);
271 _Jv_ushort name_index
, type_index
;
272 _Jv_loadIndexes (&pool
->data
[name_and_type_index
],
276 _Jv_Utf8Const
*field_name
= pool
->data
[name_index
].utf8
;
277 _Jv_Utf8Const
*field_type_name
= pool
->data
[type_index
].utf8
;
279 _Jv_Field
*the_field
= find_field (klass
, owner
, field_name
,
282 pool
->data
[index
].field
= the_field
;
283 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
287 case JV_CONSTANT_Methodref
:
288 case JV_CONSTANT_InterfaceMethodref
:
290 _Jv_ushort class_index
, name_and_type_index
;
291 _Jv_loadIndexes (&pool
->data
[index
],
293 name_and_type_index
);
294 jclass owner
= (resolve_pool_entry (klass
, class_index
)).clazz
;
297 _Jv_InitClass (owner
);
299 _Jv_ushort name_index
, type_index
;
300 _Jv_loadIndexes (&pool
->data
[name_and_type_index
],
304 _Jv_Utf8Const
*method_name
= pool
->data
[name_index
].utf8
;
305 _Jv_Utf8Const
*method_signature
= pool
->data
[type_index
].utf8
;
307 _Jv_Method
*the_method
= 0;
308 jclass found_class
= 0;
310 // We're going to cache a pointer to the _Jv_Method object
311 // when we find it. So, to ensure this doesn't get moved from
312 // beneath us, we first put all the needed Miranda methods
313 // into the target class.
314 wait_for_state (klass
, JV_STATE_LOADED
);
316 // First search the class itself.
317 the_method
= search_method_in_class (owner
, klass
,
318 method_name
, method_signature
);
323 goto end_of_method_search
;
326 // If we are resolving an interface method, search the
327 // interface's superinterfaces (A superinterface is not an
328 // interface's superclass - a superinterface is implemented by
330 if (pool
->tags
[index
] == JV_CONSTANT_InterfaceMethodref
)
335 ifaces
.list
= (jclass
*) _Jv_Malloc (ifaces
.len
336 * sizeof (jclass
*));
338 get_interfaces (owner
, &ifaces
);
340 for (int i
= 0; i
< ifaces
.count
; i
++)
342 jclass cls
= ifaces
.list
[i
];
343 the_method
= search_method_in_class (cls
, klass
, method_name
,
352 _Jv_Free (ifaces
.list
);
355 goto end_of_method_search
;
358 // Finally, search superclasses.
359 for (jclass cls
= owner
->getSuperclass (); cls
!= 0;
360 cls
= cls
->getSuperclass ())
362 the_method
= search_method_in_class (cls
, klass
, method_name
,
371 end_of_method_search
:
373 // FIXME: if (cls->loader != klass->loader), then we
374 // must actually check that the types of arguments
375 // correspond. That is, for each argument type, and
376 // the return type, doing _Jv_FindClassFromSignature
377 // with either loader should produce the same result,
378 // i.e., exactly the same jclass object. JVMS 5.4.3.3
382 java::lang::StringBuffer
*sb
= new java::lang::StringBuffer();
383 sb
->append(JvNewStringLatin1("method "));
384 sb
->append(owner
->getName());
385 sb
->append(JvNewStringLatin1("."));
386 sb
->append(_Jv_NewStringUTF(method_name
->chars()));
387 sb
->append(JvNewStringLatin1(" with signature "));
388 sb
->append(_Jv_NewStringUTF(method_signature
->chars()));
389 sb
->append(JvNewStringLatin1(" was not found."));
390 throw new java::lang::NoSuchMethodError (sb
->toString());
393 int vtable_index
= -1;
394 if (pool
->tags
[index
] != JV_CONSTANT_InterfaceMethodref
)
395 vtable_index
= (jshort
)the_method
->index
;
397 pool
->data
[index
].rmethod
398 = klass
->engine
->resolve_method(the_method
,
400 ((the_method
->accflags
401 & Modifier::STATIC
) != 0),
403 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
407 return pool
->data
[index
];
410 // This function is used to lazily locate superclasses and
411 // superinterfaces. This must be called with the class lock held.
413 _Jv_Linker::resolve_class_ref (jclass klass
, jclass
*classref
)
415 jclass ret
= *classref
;
417 // If superclass looks like a constant pool entry, resolve it now.
418 if (ret
&& (uaddr
) ret
< (uaddr
) klass
->constants
.size
)
420 if (klass
->state
< JV_STATE_LINKED
)
422 _Jv_Utf8Const
*name
= klass
->constants
.data
[(uaddr
) *classref
].utf8
;
423 ret
= _Jv_FindClass (name
, klass
->loader
);
426 throw new java::lang::NoClassDefFoundError (name
->toString());
430 ret
= klass
->constants
.data
[(uaddr
) classref
].clazz
;
435 // Find a method declared in the cls that is referenced from klass and
436 // perform access checks.
438 _Jv_Linker::search_method_in_class (jclass cls
, jclass klass
,
439 _Jv_Utf8Const
*method_name
,
440 _Jv_Utf8Const
*method_signature
)
442 using namespace java::lang::reflect
;
444 for (int i
= 0; i
< cls
->method_count
; i
++)
446 _Jv_Method
*method
= &cls
->methods
[i
];
447 if ( (!_Jv_equalUtf8Consts (method
->name
,
449 || (!_Jv_equalUtf8Consts (method
->signature
,
453 if (_Jv_CheckAccess (klass
, cls
, method
->accflags
))
457 java::lang::StringBuffer
*sb
= new java::lang::StringBuffer();
458 sb
->append(klass
->getName());
459 sb
->append(JvNewStringLatin1(": "));
460 sb
->append(cls
->getName());
461 sb
->append(JvNewStringLatin1("."));
462 sb
->append(_Jv_NewStringUTF(method_name
->chars()));
463 sb
->append(_Jv_NewStringUTF(method_signature
->chars()));
464 throw new java::lang::IllegalAccessError (sb
->toString());
471 #define INITIAL_IOFFSETS_LEN 4
472 #define INITIAL_IFACES_LEN 4
474 static _Jv_IDispatchTable null_idt
= { {SHRT_MAX
, 0, NULL
} };
476 // Generate tables for constant-time assignment testing and interface
477 // method lookup. This implements the technique described by Per Bothner
478 // <per@bothner.com> on the java-discuss mailing list on 1999-09-02:
479 // http://gcc.gnu.org/ml/java/1999-q3/msg00377.html
481 _Jv_Linker::prepare_constant_time_tables (jclass klass
)
483 if (klass
->isPrimitive () || klass
->isInterface ())
486 // Short-circuit in case we've been called already.
487 if ((klass
->idt
!= NULL
) || klass
->depth
!= 0)
490 // Calculate the class depth and ancestor table. The depth of a class
491 // is how many "extends" it is removed from Object. Thus the depth of
492 // java.lang.Object is 0, but the depth of java.io.FilterOutputStream
493 // is 2. Depth is defined for all regular and array classes, but not
494 // interfaces or primitive types.
496 jclass klass0
= klass
;
497 jboolean has_interfaces
= 0;
498 while (klass0
!= &java::lang::Object::class$
)
500 has_interfaces
+= klass0
->interface_count
;
501 klass0
= klass0
->superclass
;
505 // We do class member testing in constant time by using a small table
506 // of all the ancestor classes within each class. The first element is
507 // a pointer to the current class, and the rest are pointers to the
508 // classes ancestors, ordered from the current class down by decreasing
509 // depth. We do not include java.lang.Object in the table of ancestors,
510 // since it is redundant.
512 // FIXME: _Jv_AllocBytes
513 klass
->ancestors
= (jclass
*) _Jv_Malloc (klass
->depth
516 for (int index
= 0; index
< klass
->depth
; index
++)
518 klass
->ancestors
[index
] = klass0
;
519 klass0
= klass0
->superclass
;
522 if ((klass
->accflags
& java::lang::reflect::Modifier::ABSTRACT
) != 0)
525 // Optimization: If class implements no interfaces, use a common
526 // predefined interface table.
529 klass
->idt
= &null_idt
;
533 // FIXME: _Jv_AllocBytes
535 (_Jv_IDispatchTable
*) _Jv_Malloc (sizeof (_Jv_IDispatchTable
));
539 ifaces
.len
= INITIAL_IFACES_LEN
;
540 ifaces
.list
= (jclass
*) _Jv_Malloc (ifaces
.len
* sizeof (jclass
*));
542 int itable_size
= get_interfaces (klass
, &ifaces
);
544 if (ifaces
.count
> 0)
546 klass
->idt
->cls
.itable
=
547 // FIXME: _Jv_AllocBytes
548 (void **) _Jv_Malloc (itable_size
* sizeof (void *));
549 klass
->idt
->cls
.itable_length
= itable_size
;
551 jshort
*itable_offsets
=
552 (jshort
*) _Jv_Malloc (ifaces
.count
* sizeof (jshort
));
554 generate_itable (klass
, &ifaces
, itable_offsets
);
556 jshort cls_iindex
= find_iindex (ifaces
.list
, itable_offsets
,
559 for (int i
= 0; i
< ifaces
.count
; i
++)
561 ifaces
.list
[i
]->idt
->iface
.ioffsets
[cls_iindex
] =
565 klass
->idt
->cls
.iindex
= cls_iindex
;
567 _Jv_Free (ifaces
.list
);
568 _Jv_Free (itable_offsets
);
572 klass
->idt
->cls
.iindex
= SHRT_MAX
;
576 // Return index of item in list, or -1 if item is not present.
578 _Jv_Linker::indexof (void *item
, void **list
, jshort list_len
)
580 for (int i
=0; i
< list_len
; i
++)
588 // Find all unique interfaces directly or indirectly implemented by klass.
589 // Returns the size of the interface dispatch table (itable) for klass, which
590 // is the number of unique interfaces plus the total number of methods that
591 // those interfaces declare. May extend ifaces if required.
593 _Jv_Linker::get_interfaces (jclass klass
, _Jv_ifaces
*ifaces
)
597 for (int i
= 0; i
< klass
->interface_count
; i
++)
599 jclass iface
= klass
->interfaces
[i
];
601 /* Make sure interface is linked. */
602 wait_for_state(iface
, JV_STATE_LINKED
);
604 if (indexof (iface
, (void **) ifaces
->list
, ifaces
->count
) == -1)
606 if (ifaces
->count
+ 1 >= ifaces
->len
)
608 /* Resize ifaces list */
609 ifaces
->len
= ifaces
->len
* 2;
611 = (jclass
*) _Jv_Realloc (ifaces
->list
,
612 ifaces
->len
* sizeof(jclass
));
614 ifaces
->list
[ifaces
->count
] = iface
;
617 result
+= get_interfaces (klass
->interfaces
[i
], ifaces
);
621 if (klass
->isInterface())
622 result
+= klass
->method_count
+ 1;
623 else if (klass
->superclass
)
624 result
+= get_interfaces (klass
->superclass
, ifaces
);
628 // Fill out itable in klass, resolving method declarations in each ifaces.
629 // itable_offsets is filled out with the position of each iface in itable,
630 // such that itable[itable_offsets[n]] == ifaces.list[n].
632 _Jv_Linker::generate_itable (jclass klass
, _Jv_ifaces
*ifaces
,
633 jshort
*itable_offsets
)
635 void **itable
= klass
->idt
->cls
.itable
;
636 jshort itable_pos
= 0;
638 for (int i
= 0; i
< ifaces
->count
; i
++)
640 jclass iface
= ifaces
->list
[i
];
641 itable_offsets
[i
] = itable_pos
;
642 itable_pos
= append_partial_itable (klass
, iface
, itable
, itable_pos
);
644 /* Create interface dispatch table for iface */
645 if (iface
->idt
== NULL
)
647 // FIXME: _Jv_AllocBytes
649 = (_Jv_IDispatchTable
*) _Jv_Malloc (sizeof (_Jv_IDispatchTable
));
651 // The first element of ioffsets is its length (itself included).
652 // FIXME: _Jv_AllocBytes
653 jshort
*ioffsets
= (jshort
*) _Jv_Malloc (INITIAL_IOFFSETS_LEN
655 ioffsets
[0] = INITIAL_IOFFSETS_LEN
;
656 for (int i
= 1; i
< INITIAL_IOFFSETS_LEN
; i
++)
659 iface
->idt
->iface
.ioffsets
= ioffsets
;
664 // Format method name for use in error messages.
666 _Jv_GetMethodString (jclass klass
, _Jv_Utf8Const
*name
)
668 jstring r
= klass
->name
->toString();
669 r
= r
->concat (JvNewStringUTF ("."));
670 r
= r
->concat (name
->toString());
675 _Jv_ThrowNoSuchMethodError ()
677 throw new java::lang::NoSuchMethodError
;
680 // Each superinterface of a class (i.e. each interface that the class
681 // directly or indirectly implements) has a corresponding "Partial
682 // Interface Dispatch Table" whose size is (number of methods + 1) words.
683 // The first word is a pointer to the interface (i.e. the java.lang.Class
684 // instance for that interface). The remaining words are pointers to the
685 // actual methods that implement the methods declared in the interface,
686 // in order of declaration.
688 // Append partial interface dispatch table for "iface" to "itable", at
689 // position itable_pos.
690 // Returns the offset at which the next partial ITable should be appended.
692 _Jv_Linker::append_partial_itable (jclass klass
, jclass iface
,
693 void **itable
, jshort pos
)
695 using namespace java::lang::reflect
;
697 itable
[pos
++] = (void *) iface
;
700 for (int j
=0; j
< iface
->method_count
; j
++)
703 for (jclass cl
= klass
; cl
; cl
= cl
->getSuperclass())
705 meth
= _Jv_GetMethodLocal (cl
, iface
->methods
[j
].name
,
706 iface
->methods
[j
].signature
);
712 if (meth
&& (meth
->name
->first() == '<'))
714 // leave a placeholder in the itable for hidden init methods.
719 if ((meth
->accflags
& Modifier::STATIC
) != 0)
720 throw new java::lang::IncompatibleClassChangeError
721 (_Jv_GetMethodString (klass
, meth
->name
));
722 if ((meth
->accflags
& Modifier::ABSTRACT
) != 0)
723 throw new java::lang::AbstractMethodError
724 (_Jv_GetMethodString (klass
, meth
->name
));
725 if ((meth
->accflags
& Modifier::PUBLIC
) == 0)
726 throw new java::lang::IllegalAccessError
727 (_Jv_GetMethodString (klass
, meth
->name
));
729 itable
[pos
] = meth
->ncode
;
733 // The method doesn't exist in klass. Binary compatibility rules
734 // permit this, so we delay the error until runtime using a pointer
735 // to a method which throws an exception.
736 itable
[pos
] = (void *) _Jv_ThrowNoSuchMethodError
;
744 static _Jv_Mutex_t iindex_mutex
;
745 static bool iindex_mutex_initialized
= false;
747 // We need to find the correct offset in the Class Interface Dispatch
748 // Table for a given interface. Once we have that, invoking an interface
749 // method just requires combining the Method's index in the interface
750 // (known at compile time) to get the correct method. Doing a type test
751 // (cast or instanceof) is the same problem: Once we have a possible Partial
752 // Interface Dispatch Table, we just compare the first element to see if it
753 // matches the desired interface. So how can we find the correct offset?
754 // Our solution is to keep a vector of candiate offsets in each interface
755 // (idt->iface.ioffsets), and in each class we have an index
756 // (idt->cls.iindex) used to select the correct offset from ioffsets.
758 // Calculate and return iindex for a new class.
759 // ifaces is a vector of num interfaces that the class implements.
760 // offsets[j] is the offset in the interface dispatch table for the
761 // interface corresponding to ifaces[j].
762 // May extend the interface ioffsets if required.
764 _Jv_Linker::find_iindex (jclass
*ifaces
, jshort
*offsets
, jshort num
)
769 // Acquire a global lock to prevent itable corruption in case of multiple
770 // classes that implement an intersecting set of interfaces being linked
771 // simultaneously. We can assume that the mutex will be initialized
773 if (! iindex_mutex_initialized
)
775 _Jv_MutexInit (&iindex_mutex
);
776 iindex_mutex_initialized
= true;
779 _Jv_MutexLock (&iindex_mutex
);
781 for (i
=1;; i
++) /* each potential position in ioffsets */
783 for (j
=0;; j
++) /* each iface */
787 if (i
>= ifaces
[j
]->idt
->iface
.ioffsets
[0])
789 int ioffset
= ifaces
[j
]->idt
->iface
.ioffsets
[i
];
790 /* We can potentially share this position with another class. */
791 if (ioffset
>= 0 && ioffset
!= offsets
[j
])
792 break; /* Nope. Try next i. */
796 for (j
= 0; j
< num
; j
++)
798 int len
= ifaces
[j
]->idt
->iface
.ioffsets
[0];
802 int newlen
= 2 * len
;
805 jshort
*old_ioffsets
= ifaces
[j
]->idt
->iface
.ioffsets
;
806 // FIXME: _Jv_AllocBytes
807 jshort
*new_ioffsets
= (jshort
*) _Jv_Malloc (newlen
809 memcpy (&new_ioffsets
[1], &old_ioffsets
[1],
810 (len
- 1) * sizeof (jshort
));
811 new_ioffsets
[0] = newlen
;
814 new_ioffsets
[len
++] = -1;
816 ifaces
[j
]->idt
->iface
.ioffsets
= new_ioffsets
;
818 ifaces
[j
]->idt
->iface
.ioffsets
[i
] = offsets
[j
];
821 _Jv_MutexUnlock (&iindex_mutex
);
827 // Functions for indirect dispatch (symbolic virtual binding) support.
829 // There are three tables, atable otable and itable. atable is an
830 // array of addresses, and otable is an array of offsets, and these
831 // are used for static and virtual members respectively. itable is an
832 // array of pairs {address, index} where each address is a pointer to
835 // {a,o,i}table_syms is an array of _Jv_MethodSymbols. Each such
836 // symbol is a tuple of {classname, member name, signature}.
838 // Set this to true to enable debugging of indirect dispatch tables/linking.
839 static bool debug_link
= false;
841 // link_symbol_table() scans these two arrays and fills in the
842 // corresponding atable and otable with the addresses of static
843 // members and the offsets of virtual members.
845 // The offset (in bytes) for each resolved method or field is placed
846 // at the corresponding position in the virtual method offset table
849 // The same otable and atable may be shared by many classes.
851 // This must be called while holding the class lock.
854 _Jv_Linker::link_symbol_table (jclass klass
)
857 _Jv_MethodSymbol sym
;
858 if (klass
->otable
== NULL
859 || klass
->otable
->state
!= 0)
862 klass
->otable
->state
= 1;
865 fprintf (stderr
, "Fixing up otable in %s:\n", klass
->name
->chars());
867 (sym
= klass
->otable_syms
[index
]).class_name
!= NULL
;
870 jclass target_class
= _Jv_FindClass (sym
.class_name
, klass
->loader
);
871 _Jv_Method
*meth
= NULL
;
873 _Jv_Utf8Const
*signature
= sym
.signature
;
876 static char *bounce
= (char *)_Jv_ThrowNoSuchMethodError
;
877 ptrdiff_t offset
= (char *)(klass
->vtable
) - bounce
;
878 klass
->otable
->offsets
[index
] = offset
;
881 if (target_class
== NULL
)
882 throw new java::lang::NoClassDefFoundError
883 (_Jv_NewStringUTF (sym
.class_name
->chars()));
885 // We're looking for a field or a method, and we can tell
886 // which is needed by looking at the signature.
887 if (signature
->first() == '(' && signature
->len() >= 2)
889 // Looks like someone is trying to invoke an interface method
890 if (target_class
->isInterface())
892 using namespace java::lang
;
893 StringBuffer
*sb
= new StringBuffer();
894 sb
->append(JvNewStringLatin1("found interface "));
895 sb
->append(target_class
->getName());
896 sb
->append(JvNewStringLatin1(" when searching for a class"));
897 throw new VerifyError(sb
->toString());
900 // If the target class does not have a vtable_method_count yet,
901 // then we can't tell the offsets for its methods, so we must lay
903 wait_for_state(target_class
, JV_STATE_PREPARED
);
905 meth
= _Jv_LookupDeclaredMethod(target_class
, sym
.name
,
910 int offset
= _Jv_VTable::idx_to_offset (meth
->index
);
912 JvFail ("Bad method index");
913 JvAssert (meth
->index
< target_class
->vtable_method_count
);
914 klass
->otable
->offsets
[index
] = offset
;
917 fprintf (stderr
, " offsets[%d] = %d (class %s@%p : %s(%s))\n",
919 (int)klass
->otable
->offsets
[index
],
920 (const char*)target_class
->name
->chars(),
922 (const char*)sym
.name
->chars(),
923 (const char*)signature
->chars());
929 wait_for_state(target_class
, JV_STATE_PREPARED
);
930 _Jv_Field
*the_field
= find_field (klass
, target_class
,
931 sym
.name
, sym
.signature
);
932 if ((the_field
->flags
& java::lang::reflect::Modifier::STATIC
))
933 throw new java::lang::IncompatibleClassChangeError
;
935 klass
->otable
->offsets
[index
] = the_field
->u
.boffset
;
940 if (klass
->atable
== NULL
|| klass
->atable
->state
!= 0)
943 klass
->atable
->state
= 1;
946 (sym
= klass
->atable_syms
[index
]).class_name
!= NULL
;
949 jclass target_class
= _Jv_FindClass (sym
.class_name
, klass
->loader
);
950 _Jv_Method
*meth
= NULL
;
951 _Jv_Utf8Const
*signature
= sym
.signature
;
953 // ??? Setting this pointer to null will at least get us a
954 // NullPointerException
955 klass
->atable
->addresses
[index
] = NULL
;
957 if (target_class
== NULL
)
958 throw new java::lang::NoClassDefFoundError
959 (_Jv_NewStringUTF (sym
.class_name
->chars()));
961 // We're looking for a static field or a static method, and we
962 // can tell which is needed by looking at the signature.
963 if (signature
->first() == '(' && signature
->len() >= 2)
965 // If the target class does not have a vtable_method_count yet,
966 // then we can't tell the offsets for its methods, so we must lay
968 wait_for_state (target_class
, JV_STATE_PREPARED
);
970 // Interface methods cannot have bodies.
971 if (target_class
->isInterface())
973 using namespace java::lang
;
974 StringBuffer
*sb
= new StringBuffer();
975 sb
->append(JvNewStringLatin1("class "));
976 sb
->append(target_class
->getName());
977 sb
->append(JvNewStringLatin1(" is an interface: "
979 throw new VerifyError(sb
->toString());
982 meth
= _Jv_LookupDeclaredMethod(target_class
, sym
.name
,
987 if (meth
->ncode
) // Maybe abstract?
989 klass
->atable
->addresses
[index
] = meth
->ncode
;
991 fprintf (stderr
, " addresses[%d] = %p (class %s@%p : %s(%s))\n",
993 &klass
->atable
->addresses
[index
],
994 (const char*)target_class
->name
->chars(),
996 (const char*)sym
.name
->chars(),
997 (const char*)signature
->chars());
1001 klass
->atable
->addresses
[index
]
1002 = (void *)_Jv_ThrowNoSuchMethodError
;
1009 wait_for_state(target_class
, JV_STATE_PREPARED
);
1010 _Jv_Field
*the_field
= find_field (klass
, target_class
,
1011 sym
.name
, sym
.signature
);
1012 if ((the_field
->flags
& java::lang::reflect::Modifier::STATIC
))
1013 klass
->atable
->addresses
[index
] = the_field
->u
.addr
;
1015 throw new java::lang::IncompatibleClassChangeError
;
1020 if (klass
->itable
== NULL
1021 || klass
->itable
->state
!= 0)
1024 klass
->itable
->state
= 1;
1027 (sym
= klass
->itable_syms
[index
]).class_name
!= NULL
;
1030 jclass target_class
= _Jv_FindClass (sym
.class_name
, klass
->loader
);
1031 _Jv_Utf8Const
*signature
= sym
.signature
;
1036 wait_for_state(target_class
, JV_STATE_LOADED
);
1037 bool found
= _Jv_getInterfaceMethod (target_class
, cls
, i
,
1038 sym
.name
, sym
.signature
);
1042 klass
->itable
->addresses
[index
* 2] = cls
;
1043 klass
->itable
->addresses
[index
* 2 + 1] = (void *)(unsigned long) i
;
1046 fprintf (stderr
, " interfaces[%d] = %p (interface %s@%p : %s(%s))\n",
1048 klass
->itable
->addresses
[index
* 2],
1049 (const char*)cls
->name
->chars(),
1051 (const char*)sym
.name
->chars(),
1052 (const char*)signature
->chars());
1053 fprintf (stderr
, " [%d] = offset %d\n",
1055 (int)(unsigned long)klass
->itable
->addresses
[index
* 2 + 1]);
1060 throw new java::lang::IncompatibleClassChangeError
;
1065 // For each catch_record in the list of caught classes, fill in the
1068 _Jv_Linker::link_exception_table (jclass self
)
1070 struct _Jv_CatchClass
*catch_record
= self
->catch_classes
;
1071 if (!catch_record
|| catch_record
->classname
)
1074 while (catch_record
->classname
)
1079 = _Jv_FindClass (catch_record
->classname
,
1080 self
->getClassLoaderInternal ());
1081 *catch_record
->address
= target_class
;
1083 catch (::java::lang::Throwable
*t
)
1085 // FIXME: We need to do something better here.
1086 *catch_record
->address
= 0;
1090 self
->catch_classes
->classname
= (_Jv_Utf8Const
*)-1;
1093 // This is put in empty vtable slots.
1095 _Jv_abstractMethodError (void)
1097 throw new java::lang::AbstractMethodError();
1100 // Set itable method indexes for members of interface IFACE.
1102 _Jv_Linker::layout_interface_methods (jclass iface
)
1104 if (! iface
->isInterface())
1107 // itable indexes start at 1.
1108 // FIXME: Static initalizers currently get a NULL placeholder entry in the
1109 // itable so they are also assigned an index here.
1110 for (int i
= 0; i
< iface
->method_count
; i
++)
1111 iface
->methods
[i
].index
= i
+ 1;
1114 // Prepare virtual method declarations in KLASS, and any superclasses
1115 // as required, by determining their vtable index, setting
1116 // method->index, and finally setting the class's vtable_method_count.
1117 // Must be called with the lock for KLASS held.
1119 _Jv_Linker::layout_vtable_methods (jclass klass
)
1121 if (klass
->vtable
!= NULL
|| klass
->isInterface()
1122 || klass
->vtable_method_count
!= -1)
1125 jclass superclass
= klass
->getSuperclass();
1127 if (superclass
!= NULL
&& superclass
->vtable_method_count
== -1)
1129 JvSynchronize
sync (superclass
);
1130 layout_vtable_methods (superclass
);
1133 int index
= (superclass
== NULL
? 0 : superclass
->vtable_method_count
);
1135 for (int i
= 0; i
< klass
->method_count
; ++i
)
1137 _Jv_Method
*meth
= &klass
->methods
[i
];
1138 _Jv_Method
*super_meth
= NULL
;
1140 if (! _Jv_isVirtualMethod (meth
))
1143 if (superclass
!= NULL
)
1146 super_meth
= _Jv_LookupDeclaredMethod (superclass
, meth
->name
,
1147 meth
->signature
, &declarer
);
1148 // See if this method actually overrides the other method
1152 if (! _Jv_isVirtualMethod (super_meth
)
1153 || ! _Jv_CheckAccess (klass
, declarer
,
1154 super_meth
->accflags
))
1156 else if ((super_meth
->accflags
1157 & java::lang::reflect::Modifier::FINAL
) != 0)
1159 using namespace java::lang
;
1160 StringBuffer
*sb
= new StringBuffer();
1161 sb
->append(JvNewStringLatin1("method "));
1162 sb
->append(_Jv_GetMethodString(klass
, meth
->name
));
1163 sb
->append(JvNewStringLatin1(" overrides final method "));
1164 sb
->append(_Jv_GetMethodString(declarer
, super_meth
->name
));
1165 throw new VerifyError(sb
->toString());
1171 meth
->index
= super_meth
->index
;
1173 meth
->index
= index
++;
1176 klass
->vtable_method_count
= index
;
1179 // Set entries in VTABLE for virtual methods declared in KLASS.
1181 _Jv_Linker::set_vtable_entries (jclass klass
, _Jv_VTable
*vtable
)
1183 for (int i
= klass
->method_count
- 1; i
>= 0; i
--)
1185 using namespace java::lang::reflect
;
1187 _Jv_Method
*meth
= &klass
->methods
[i
];
1188 if (meth
->index
== (_Jv_ushort
) -1)
1190 if ((meth
->accflags
& Modifier::ABSTRACT
))
1191 vtable
->set_method(meth
->index
, (void *) &_Jv_abstractMethodError
);
1193 vtable
->set_method(meth
->index
, meth
->ncode
);
1197 // Allocate and lay out the virtual method table for KLASS. This will
1198 // also cause vtables to be generated for any non-abstract
1199 // superclasses, and virtual method layout to occur for any abstract
1200 // superclasses. Must be called with monitor lock for KLASS held.
1202 _Jv_Linker::make_vtable (jclass klass
)
1204 using namespace java::lang::reflect
;
1206 // If the vtable exists, or for interface classes, do nothing. All
1207 // other classes, including abstract classes, need a vtable.
1208 if (klass
->vtable
!= NULL
|| klass
->isInterface())
1211 // Ensure all the `ncode' entries are set.
1212 klass
->engine
->create_ncode(klass
);
1214 // Class must be laid out before we can create a vtable.
1215 if (klass
->vtable_method_count
== -1)
1216 layout_vtable_methods (klass
);
1218 // Allocate the new vtable.
1219 _Jv_VTable
*vtable
= _Jv_VTable::new_vtable (klass
->vtable_method_count
);
1220 klass
->vtable
= vtable
;
1222 // Copy the vtable of the closest superclass.
1223 jclass superclass
= klass
->superclass
;
1225 JvSynchronize
sync (superclass
);
1226 make_vtable (superclass
);
1228 for (int i
= 0; i
< superclass
->vtable_method_count
; ++i
)
1229 vtable
->set_method (i
, superclass
->vtable
->get_method (i
));
1231 // Set the class pointer and GC descriptor.
1232 vtable
->clas
= klass
;
1233 vtable
->gc_descr
= _Jv_BuildGCDescr (klass
);
1235 // For each virtual declared in klass, set new vtable entry or
1236 // override an old one.
1237 set_vtable_entries (klass
, vtable
);
1239 // It is an error to have an abstract method in a concrete class.
1240 if (! (klass
->accflags
& Modifier::ABSTRACT
))
1242 for (int i
= 0; i
< klass
->vtable_method_count
; ++i
)
1243 if (vtable
->get_method(i
) == (void *) &_Jv_abstractMethodError
)
1245 using namespace java::lang
;
1246 while (klass
!= NULL
)
1248 for (int j
= 0; j
< klass
->method_count
; ++j
)
1250 if (klass
->methods
[j
].index
== i
)
1252 StringBuffer
*buf
= new StringBuffer ();
1253 buf
->append (_Jv_NewStringUtf8Const (klass
->methods
[j
].name
));
1254 buf
->append ((jchar
) ' ');
1255 buf
->append (_Jv_NewStringUtf8Const (klass
->methods
[j
].signature
));
1256 throw new AbstractMethodError (buf
->toString ());
1259 klass
= klass
->getSuperclass ();
1261 // Couldn't find the name, which is weird.
1262 // But we still must throw the error.
1263 throw new AbstractMethodError ();
1268 // Lay out the class, allocating space for static fields and computing
1269 // offsets of instance fields. The class lock must be held by the
1272 _Jv_Linker::ensure_fields_laid_out (jclass klass
)
1274 if (klass
->size_in_bytes
!= -1)
1277 // Compute the alignment for this type by searching through the
1278 // superclasses and finding the maximum required alignment. We
1279 // could consider caching this in the Class.
1280 int max_align
= __alignof__ (java::lang::Object
);
1281 jclass super
= klass
->getSuperclass();
1282 while (super
!= NULL
)
1284 // Ensure that our super has its super installed before
1286 wait_for_state(super
, JV_STATE_LOADING
);
1287 ensure_fields_laid_out(super
);
1288 int num
= JvNumInstanceFields (super
);
1289 _Jv_Field
*field
= JvGetFirstInstanceField (super
);
1292 int field_align
= get_alignment_from_class (field
->type
);
1293 if (field_align
> max_align
)
1294 max_align
= field_align
;
1298 super
= super
->getSuperclass();
1302 int static_size
= 0;
1304 // Although java.lang.Object is never interpreted, an interface can
1305 // have a null superclass. Note that we have to lay out an
1306 // interface because it might have static fields.
1307 if (klass
->superclass
)
1308 instance_size
= klass
->superclass
->size();
1310 instance_size
= java::lang::Object::class$
.size();
1312 for (int i
= 0; i
< klass
->field_count
; i
++)
1317 _Jv_Field
*field
= &klass
->fields
[i
];
1319 if (! field
->isRef ())
1321 // It is safe to resolve the field here, since it's a
1322 // primitive class, which does not cause loading to happen.
1323 resolve_field (field
, klass
->loader
);
1325 field_size
= field
->type
->size ();
1326 field_align
= get_alignment_from_class (field
->type
);
1330 field_size
= sizeof (jobject
);
1331 field_align
= __alignof__ (jobject
);
1334 field
->bsize
= field_size
;
1336 if ((field
->flags
& java::lang::reflect::Modifier::STATIC
))
1338 if (field
->u
.addr
== NULL
)
1340 // This computes an offset into a region we'll allocate
1341 // shortly, and then add this offset to the start
1343 static_size
= ROUND (static_size
, field_align
);
1344 field
->u
.boffset
= static_size
;
1345 static_size
+= field_size
;
1350 instance_size
= ROUND (instance_size
, field_align
);
1351 field
->u
.boffset
= instance_size
;
1352 instance_size
+= field_size
;
1353 if (field_align
> max_align
)
1354 max_align
= field_align
;
1358 if (static_size
!= 0)
1359 klass
->engine
->allocate_static_fields (klass
, static_size
);
1361 // Set the instance size for the class. Note that first we round it
1362 // to the alignment required for this object; this keeps us in sync
1363 // with our current ABI.
1364 instance_size
= ROUND (instance_size
, max_align
);
1365 klass
->size_in_bytes
= instance_size
;
1368 // This takes the class to state JV_STATE_LINKED. The class lock must
1369 // be held when calling this.
1371 _Jv_Linker::ensure_class_linked (jclass klass
)
1373 if (klass
->state
>= JV_STATE_LINKED
)
1376 int state
= klass
->state
;
1379 // Short-circuit, so that mutually dependent classes are ok.
1380 klass
->state
= JV_STATE_LINKED
;
1382 _Jv_Constants
*pool
= &klass
->constants
;
1384 // Compiled classes require that their class constants be
1385 // resolved here. However, interpreted classes need their
1386 // constants to be resolved lazily. If we resolve an
1387 // interpreted class' constants eagerly, we can end up with
1388 // spurious IllegalAccessErrors when the constant pool contains
1389 // a reference to a class we can't access. This can validly
1390 // occur in an obscure case involving the InnerClasses
1393 if (! _Jv_IsInterpretedClass (klass
))
1396 // Resolve class constants first, since other constant pool
1397 // entries may rely on these.
1398 for (int index
= 1; index
< pool
->size
; ++index
)
1400 if (pool
->tags
[index
] == JV_CONSTANT_Class
)
1401 resolve_pool_entry (klass
, index
);
1405 #if 0 // Should be redundant now
1406 // If superclass looks like a constant pool entry,
1408 if ((uaddr
) klass
->superclass
< (uaddr
) pool
->size
)
1409 klass
->superclass
= pool
->data
[(uaddr
) klass
->superclass
].clazz
;
1411 // Likewise for interfaces.
1412 for (int i
= 0; i
< klass
->interface_count
; i
++)
1414 if ((uaddr
) klass
->interfaces
[i
] < (uaddr
) pool
->size
)
1415 klass
->interfaces
[i
]
1416 = pool
->data
[(uaddr
) klass
->interfaces
[i
]].clazz
;
1420 // Resolve the remaining constant pool entries.
1421 for (int index
= 1; index
< pool
->size
; ++index
)
1423 if (pool
->tags
[index
] == JV_CONSTANT_String
)
1427 str
= _Jv_NewStringUtf8Const (pool
->data
[index
].utf8
);
1428 pool
->data
[index
].o
= str
;
1429 pool
->tags
[index
] |= JV_CONSTANT_ResolvedFlag
;
1433 if (klass
->engine
->need_resolve_string_fields())
1435 jfieldID f
= JvGetFirstStaticField (klass
);
1436 for (int n
= JvNumStaticFields (klass
); n
> 0; --n
)
1438 int mod
= f
->getModifiers ();
1439 // If we have a static String field with a non-null initial
1440 // value, we know it points to a Utf8Const.
1441 resolve_field(f
, klass
->loader
);
1442 if (f
->getClass () == &java::lang::String::class$
1443 && (mod
& java::lang::reflect::Modifier::STATIC
) != 0)
1445 jstring
*strp
= (jstring
*) f
->u
.addr
;
1447 *strp
= _Jv_NewStringUtf8Const ((_Jv_Utf8Const
*) *strp
);
1449 f
= f
->getNextField ();
1453 klass
->notifyAll ();
1455 _Jv_PushClass (klass
);
1457 catch (java::lang::Throwable
*t
)
1459 klass
->state
= state
;
1464 // This ensures that symbolic superclass and superinterface references
1465 // are resolved for the indicated class. This must be called with the
1468 _Jv_Linker::ensure_supers_installed (jclass klass
)
1470 resolve_class_ref (klass
, &klass
->superclass
);
1471 // An interface won't have a superclass.
1472 if (klass
->superclass
)
1473 wait_for_state (klass
->superclass
, JV_STATE_LOADING
);
1475 for (int i
= 0; i
< klass
->interface_count
; ++i
)
1477 resolve_class_ref (klass
, &klass
->interfaces
[i
]);
1478 wait_for_state (klass
->interfaces
[i
], JV_STATE_LOADING
);
1482 // This adds missing `Miranda methods' to a class.
1484 _Jv_Linker::add_miranda_methods (jclass base
, jclass iface_class
)
1486 // Note that at this point, all our supers, and the supers of all
1487 // our superclasses and superinterfaces, will have been installed.
1489 for (int i
= 0; i
< iface_class
->interface_count
; ++i
)
1491 jclass interface
= iface_class
->interfaces
[i
];
1493 for (int j
= 0; j
< interface
->method_count
; ++j
)
1495 _Jv_Method
*meth
= &interface
->methods
[j
];
1496 // Don't bother with <clinit>.
1497 if (meth
->name
->first() == '<')
1499 _Jv_Method
*new_meth
= _Jv_LookupDeclaredMethod (base
, meth
->name
,
1503 // We assume that such methods are very unlikely, so we
1504 // just reallocate the method array each time one is
1505 // found. This greatly simplifies the searching --
1506 // otherwise we have to make sure that each such method
1507 // found is really unique among all superinterfaces.
1508 int new_count
= base
->method_count
+ 1;
1510 = (_Jv_Method
*) _Jv_AllocBytes (sizeof (_Jv_Method
)
1512 memcpy (new_m
, base
->methods
,
1513 sizeof (_Jv_Method
) * base
->method_count
);
1516 new_m
[base
->method_count
] = *meth
;
1517 new_m
[base
->method_count
].index
= (_Jv_ushort
) -1;
1518 new_m
[base
->method_count
].accflags
1519 |= java::lang::reflect::Modifier::INVISIBLE
;
1521 base
->methods
= new_m
;
1522 base
->method_count
= new_count
;
1526 wait_for_state (interface
, JV_STATE_LOADED
);
1527 add_miranda_methods (base
, interface
);
1531 // This ensures that the class' method table is "complete". This must
1532 // be called with the class lock held.
1534 _Jv_Linker::ensure_method_table_complete (jclass klass
)
1536 if (klass
->vtable
!= NULL
|| klass
->isInterface())
1539 // We need our superclass to have its own Miranda methods installed.
1540 wait_for_state (klass
->getSuperclass (), JV_STATE_LOADED
);
1542 // A class might have so-called "Miranda methods". This is a method
1543 // that is declared in an interface and not re-declared in an
1544 // abstract class. Some compilers don't emit declarations for such
1545 // methods in the class; this will give us problems since we expect
1546 // a declaration for any method requiring a vtable entry. We handle
1547 // this here by searching for such methods and constructing new
1548 // internal declarations for them. Note that we do this
1549 // unconditionally, and not just for abstract classes, to correctly
1550 // account for cases where a class is modified to be concrete and
1551 // still incorrectly inherits an abstract method.
1552 int pre_count
= klass
->method_count
;
1553 add_miranda_methods (klass
, klass
);
1555 // Let the execution engine know that we've added methods.
1556 if (klass
->method_count
!= pre_count
)
1557 klass
->engine
->post_miranda_hook(klass
);
1560 // Verify a class. Must be called with class lock held.
1562 _Jv_Linker::verify_class (jclass klass
)
1564 klass
->engine
->verify(klass
);
1567 // Check the assertions contained in the type assertion table for KLASS.
1568 // This is the equivilent of bytecode verification for native, BC-ABI code.
1570 _Jv_Linker::verify_type_assertions (jclass klass
)
1573 fprintf (stderr
, "Evaluating type assertions for %s:\n",
1574 klass
->name
->chars());
1576 if (klass
->assertion_table
== NULL
)
1579 for (int i
= 0;; i
++)
1581 int assertion_code
= klass
->assertion_table
[i
].assertion_code
;
1582 _Jv_Utf8Const
*op1
= klass
->assertion_table
[i
].op1
;
1583 _Jv_Utf8Const
*op2
= klass
->assertion_table
[i
].op2
;
1585 if (assertion_code
== JV_ASSERT_END_OF_TABLE
)
1587 else if (assertion_code
== JV_ASSERT_TYPES_COMPATIBLE
)
1591 fprintf (stderr
, " code=%i, operand A=%s B=%s\n",
1592 assertion_code
, op1
->chars(), op2
->chars());
1595 // The operands are class signatures. op1 is the source,
1596 // op2 is the target.
1597 jclass cl1
= _Jv_FindClassFromSignature (op1
->chars(),
1598 klass
->getClassLoaderInternal());
1599 jclass cl2
= _Jv_FindClassFromSignature (op2
->chars(),
1600 klass
->getClassLoaderInternal());
1602 // If the class doesn't exist, ignore the assertion. An exception
1603 // will be thrown later if an attempt is made to actually
1604 // instantiate the class.
1605 if (cl1
== NULL
|| cl2
== NULL
)
1608 if (! _Jv_IsAssignableFromSlow (cl2
, cl1
))
1610 jstring s
= JvNewStringUTF ("Incompatible types: In class ");
1611 s
= s
->concat (klass
->getName());
1612 s
= s
->concat (JvNewStringUTF (": "));
1613 s
= s
->concat (cl1
->getName());
1614 s
= s
->concat (JvNewStringUTF (" is not assignable to "));
1615 s
= s
->concat (cl2
->getName());
1616 throw new java::lang::VerifyError (s
);
1619 else if (assertion_code
== JV_ASSERT_IS_INSTANTIABLE
)
1621 // TODO: Implement this.
1623 // Unknown assertion codes are ignored, for forwards-compatibility.
1628 _Jv_Linker::print_class_loaded (jclass klass
)
1630 char *codesource
= NULL
;
1631 if (klass
->protectionDomain
!= NULL
)
1633 java::security::CodeSource
*cs
1634 = klass
->protectionDomain
->getCodeSource();
1637 jstring css
= cs
->toString();
1638 int len
= JvGetStringUTFLength(css
);
1639 codesource
= (char *) _Jv_AllocBytes(len
+ 1);
1640 JvGetStringUTFRegion(css
, 0, css
->length(), codesource
);
1641 codesource
[len
] = '\0';
1644 if (codesource
== NULL
)
1645 codesource
= "<no code source>";
1647 // We use a somewhat bogus test for the ABI here.
1650 if (_Jv_IsInterpretedClass (klass
))
1655 else if (klass
->state
== JV_STATE_PRELOADING
)
1656 abi
= "BC-compiled";
1658 abi
= "pre-compiled";
1660 fprintf (stderr
, "[Loaded (%s) %s from %s]\n", abi
, klass
->name
->chars(),
1664 // FIXME: mention invariants and stuff.
1666 _Jv_Linker::wait_for_state (jclass klass
, int state
)
1668 if (klass
->state
>= state
)
1671 JvSynchronize
sync (klass
);
1673 // This is similar to the strategy for class initialization. If we
1674 // already hold the lock, just leave.
1675 java::lang::Thread
*self
= java::lang::Thread::currentThread();
1676 while (klass
->state
<= state
1678 && klass
->thread
!= self
)
1681 java::lang::Thread
*save
= klass
->thread
;
1682 klass
->thread
= self
;
1684 // Print some debugging info if requested. Interpreted classes are
1685 // handled in defineclass, so we only need to handle the two
1686 // pre-compiled cases here.
1687 if (gcj::verbose_class_flag
1688 && (klass
->state
== JV_STATE_COMPILED
1689 || klass
->state
== JV_STATE_PRELOADING
)
1691 && ! _Jv_IsInterpretedClass (klass
)
1694 print_class_loaded (klass
);
1698 if (state
>= JV_STATE_LOADING
&& klass
->state
< JV_STATE_LOADING
)
1700 ensure_supers_installed (klass
);
1701 klass
->set_state(JV_STATE_LOADING
);
1704 if (state
>= JV_STATE_LOADED
&& klass
->state
< JV_STATE_LOADED
)
1706 ensure_method_table_complete (klass
);
1707 klass
->set_state(JV_STATE_LOADED
);
1710 if (state
>= JV_STATE_PREPARED
&& klass
->state
< JV_STATE_PREPARED
)
1712 ensure_fields_laid_out (klass
);
1713 make_vtable (klass
);
1714 layout_interface_methods (klass
);
1715 prepare_constant_time_tables (klass
);
1716 klass
->set_state(JV_STATE_PREPARED
);
1719 if (state
>= JV_STATE_LINKED
&& klass
->state
< JV_STATE_LINKED
)
1721 verify_class (klass
);
1723 ensure_class_linked (klass
);
1724 link_exception_table (klass
);
1725 link_symbol_table (klass
);
1726 klass
->set_state(JV_STATE_LINKED
);
1729 catch (java::lang::Throwable
*exc
)
1731 klass
->thread
= save
;
1732 klass
->set_state(JV_STATE_ERROR
);
1736 klass
->thread
= save
;
1738 if (klass
->state
== JV_STATE_ERROR
)
1739 throw new java::lang::LinkageError
;