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> */
18 #include <java-interp.h>
24 #include <java-cpool.h>
25 #include <execution.h>
26 #include <java/lang/Class.h>
27 #include <java/lang/String.h>
28 #include <java/lang/StringBuffer.h>
29 #include <java/lang/Thread.h>
30 #include <java/lang/InternalError.h>
31 #include <java/lang/VirtualMachineError.h>
32 #include <java/lang/VerifyError.h>
33 #include <java/lang/NoSuchFieldError.h>
34 #include <java/lang/NoSuchMethodError.h>
35 #include <java/lang/ClassFormatError.h>
36 #include <java/lang/IllegalAccessError.h>
37 #include <java/lang/AbstractMethodError.h>
38 #include <java/lang/NoClassDefFoundError.h>
39 #include <java/lang/IncompatibleClassChangeError.h>
40 #include <java/lang/VerifyError.h>
41 #include <java/lang/VMClassLoader.h>
42 #include <java/lang/reflect/Modifier.h>
43 #include <java/security/CodeSource.h>
47 // When true, print debugging information about class loading.
48 bool gcj::verbose_class_flag;
50 typedef unsigned int uaddr __attribute__ ((mode (pointer)));
59 #define ALIGNOF(TYPE) (offsetof (aligner<TYPE>, field))
61 // This returns the alignment of a type as it would appear in a
62 // structure. This can be different from the alignment of the type
63 // itself. For instance on x86 double is 8-aligned but struct{double}
66 _Jv_Linker::get_alignment_from_class (jclass klass)
68 if (klass == JvPrimClass (byte))
69 return ALIGNOF (jbyte);
70 else if (klass == JvPrimClass (short))
71 return ALIGNOF (jshort);
72 else if (klass == JvPrimClass (int))
73 return ALIGNOF (jint);
74 else if (klass == JvPrimClass (long))
75 return ALIGNOF (jlong);
76 else if (klass == JvPrimClass (boolean))
77 return ALIGNOF (jboolean);
78 else if (klass == JvPrimClass (char))
79 return ALIGNOF (jchar);
80 else if (klass == JvPrimClass (float))
81 return ALIGNOF (jfloat);
82 else if (klass == JvPrimClass (double))
83 return ALIGNOF (jdouble);
85 return ALIGNOF (jobject);
89 _Jv_Linker::resolve_field (_Jv_Field *field, java::lang::ClassLoader *loader)
91 if (! field->isResolved ())
93 _Jv_Utf8Const *sig = (_Jv_Utf8Const*)field->type;
94 field->type = _Jv_FindClassFromSignature (sig->chars(), loader);
95 field->flags &= ~_Jv_FIELD_UNRESOLVED_FLAG;
99 // A helper for find_field that knows how to recursively search
100 // superclasses and interfaces.
102 _Jv_Linker::find_field_helper (jclass search, _Jv_Utf8Const *name,
107 // From 5.4.3.2. First search class itself.
108 for (int i = 0; i < search->field_count; ++i)
110 _Jv_Field *field = &search->fields[i];
111 if (_Jv_equalUtf8Consts (field->name, name))
118 // Next search direct interfaces.
119 for (int i = 0; i < search->interface_count; ++i)
121 _Jv_Field *result = find_field_helper (search->interfaces[i], name,
127 // Now search superclass.
128 search = search->superclass;
135 // KLASS is the class that is requesting the field.
136 // OWNER is the class in which the field should be found.
137 // FIELD_TYPE_NAME is the type descriptor for the field.
138 // This function does the class loader type checks, and
139 // also access checks. Returns the field, or throws an
140 // exception on error.
142 _Jv_Linker::find_field (jclass klass, jclass owner,
143 _Jv_Utf8Const *field_name,
144 _Jv_Utf8Const *field_type_name)
146 jclass field_type = 0;
148 if (owner->loader != klass->loader)
150 // FIXME: The implementation of this function
151 // (_Jv_FindClassFromSignature) will generate an instance of
152 // _Jv_Utf8Const for each call if the field type is a class name
153 // (Lxx.yy.Z;). This may be too expensive to do for each and
154 // every fieldref being resolved. For now, we fix the problem
155 // by only doing it when we have a loader different from the
156 // class declaring the field.
157 field_type = _Jv_FindClassFromSignature (field_type_name->chars(),
161 jclass found_class = 0;
162 _Jv_Field *the_field = find_field_helper (owner, field_name, &found_class);
166 java::lang::StringBuffer *sb = new java::lang::StringBuffer();
167 sb->append(JvNewStringLatin1("field "));
168 sb->append(owner->getName());
169 sb->append(JvNewStringLatin1("."));
170 sb->append(_Jv_NewStringUTF(field_name->chars()));
171 sb->append(JvNewStringLatin1(" was not found."));
172 throw new java::lang::NoSuchFieldError (sb->toString());
175 if (_Jv_CheckAccess (klass, found_class, the_field->flags))
177 // Resolve the field using the class' own loader if necessary.
179 if (!the_field->isResolved ())
180 resolve_field (the_field, found_class->loader);
182 if (field_type != 0 && the_field->type != field_type)
183 throw new java::lang::LinkageError
185 ("field type mismatch with different loaders"));
189 java::lang::StringBuffer *sb
190 = new java::lang::StringBuffer ();
191 sb->append(klass->getName());
192 sb->append(JvNewStringLatin1(": "));
193 sb->append(found_class->getName());
194 sb->append(JvNewStringLatin1("."));
195 sb->append(_Jv_NewStringUtf8Const (field_name));
196 throw new java::lang::IllegalAccessError(sb->toString());
203 _Jv_Linker::resolve_pool_entry (jclass klass, int index)
205 using namespace java::lang::reflect;
207 _Jv_Constants *pool = &klass->constants;
209 if ((pool->tags[index] & JV_CONSTANT_ResolvedFlag) != 0)
210 return pool->data[index];
212 switch (pool->tags[index])
214 case JV_CONSTANT_Class:
216 _Jv_Utf8Const *name = pool->data[index].utf8;
219 if (name->first() == '[')
220 found = _Jv_FindClassFromSignature (name->chars(),
223 found = _Jv_FindClass (name, klass->loader);
226 throw new java::lang::NoClassDefFoundError (name->toString());
228 // Check accessibility, but first strip array types as
229 // _Jv_ClassNameSamePackage can't handle arrays.
232 check && check->isArray();
233 check = check->getComponentType())
235 if ((found->accflags & Modifier::PUBLIC) == Modifier::PUBLIC
236 || (_Jv_ClassNameSamePackage (check->name,
239 pool->data[index].clazz = found;
240 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
244 java::lang::StringBuffer *sb = new java::lang::StringBuffer ();
245 sb->append(klass->getName());
246 sb->append(JvNewStringLatin1(" can't access class "));
247 sb->append(found->getName());
248 throw new java::lang::IllegalAccessError(sb->toString());
253 case JV_CONSTANT_String:
256 str = _Jv_NewStringUtf8Const (pool->data[index].utf8);
257 pool->data[index].o = str;
258 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
262 case JV_CONSTANT_Fieldref:
264 _Jv_ushort class_index, name_and_type_index;
265 _Jv_loadIndexes (&pool->data[index],
267 name_and_type_index);
268 jclass owner = (resolve_pool_entry (klass, class_index)).clazz;
271 _Jv_InitClass (owner);
273 _Jv_ushort name_index, type_index;
274 _Jv_loadIndexes (&pool->data[name_and_type_index],
278 _Jv_Utf8Const *field_name = pool->data[name_index].utf8;
279 _Jv_Utf8Const *field_type_name = pool->data[type_index].utf8;
281 _Jv_Field *the_field = find_field (klass, owner, field_name,
284 pool->data[index].field = the_field;
285 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
289 case JV_CONSTANT_Methodref:
290 case JV_CONSTANT_InterfaceMethodref:
292 _Jv_ushort class_index, name_and_type_index;
293 _Jv_loadIndexes (&pool->data[index],
295 name_and_type_index);
296 jclass owner = (resolve_pool_entry (klass, class_index)).clazz;
299 _Jv_InitClass (owner);
301 _Jv_ushort name_index, type_index;
302 _Jv_loadIndexes (&pool->data[name_and_type_index],
306 _Jv_Utf8Const *method_name = pool->data[name_index].utf8;
307 _Jv_Utf8Const *method_signature = pool->data[type_index].utf8;
309 _Jv_Method *the_method = 0;
310 jclass found_class = 0;
312 // We're going to cache a pointer to the _Jv_Method object
313 // when we find it. So, to ensure this doesn't get moved from
314 // beneath us, we first put all the needed Miranda methods
315 // into the target class.
316 wait_for_state (klass, JV_STATE_LOADED);
318 // First search the class itself.
319 the_method = search_method_in_class (owner, klass,
320 method_name, method_signature);
325 goto end_of_method_search;
328 // If we are resolving an interface method, search the
329 // interface's superinterfaces (A superinterface is not an
330 // interface's superclass - a superinterface is implemented by
332 if (pool->tags[index] == JV_CONSTANT_InterfaceMethodref)
337 ifaces.list = (jclass *) _Jv_Malloc (ifaces.len
338 * sizeof (jclass *));
340 get_interfaces (owner, &ifaces);
342 for (int i = 0; i < ifaces.count; i++)
344 jclass cls = ifaces.list[i];
345 the_method = search_method_in_class (cls, klass, method_name,
354 _Jv_Free (ifaces.list);
357 goto end_of_method_search;
360 // Finally, search superclasses.
361 for (jclass cls = owner->getSuperclass (); cls != 0;
362 cls = cls->getSuperclass ())
364 the_method = search_method_in_class (cls, klass, method_name,
373 end_of_method_search:
375 // FIXME: if (cls->loader != klass->loader), then we
376 // must actually check that the types of arguments
377 // correspond. That is, for each argument type, and
378 // the return type, doing _Jv_FindClassFromSignature
379 // with either loader should produce the same result,
380 // i.e., exactly the same jclass object. JVMS 5.4.3.3
384 java::lang::StringBuffer *sb = new java::lang::StringBuffer();
385 sb->append(JvNewStringLatin1("method "));
386 sb->append(owner->getName());
387 sb->append(JvNewStringLatin1("."));
388 sb->append(_Jv_NewStringUTF(method_name->chars()));
389 sb->append(JvNewStringLatin1(" with signature "));
390 sb->append(_Jv_NewStringUTF(method_signature->chars()));
391 sb->append(JvNewStringLatin1(" was not found."));
392 throw new java::lang::NoSuchMethodError (sb->toString());
395 int vtable_index = -1;
396 if (pool->tags[index] != JV_CONSTANT_InterfaceMethodref)
397 vtable_index = (jshort)the_method->index;
399 pool->data[index].rmethod
400 = klass->engine->resolve_method(the_method,
402 ((the_method->accflags
403 & Modifier::STATIC) != 0),
405 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
409 return pool->data[index];
412 // This function is used to lazily locate superclasses and
413 // superinterfaces. This must be called with the class lock held.
415 _Jv_Linker::resolve_class_ref (jclass klass, jclass *classref)
417 jclass ret = *classref;
419 // If superclass looks like a constant pool entry, resolve it now.
420 if (ret && (uaddr) ret < (uaddr) klass->constants.size)
422 if (klass->state < JV_STATE_LINKED)
424 _Jv_Utf8Const *name = klass->constants.data[(uaddr) *classref].utf8;
425 ret = _Jv_FindClass (name, klass->loader);
428 throw new java::lang::NoClassDefFoundError (name->toString());
432 ret = klass->constants.data[(uaddr) classref].clazz;
437 // Find a method declared in the cls that is referenced from klass and
438 // perform access checks.
440 _Jv_Linker::search_method_in_class (jclass cls, jclass klass,
441 _Jv_Utf8Const *method_name,
442 _Jv_Utf8Const *method_signature)
444 using namespace java::lang::reflect;
446 for (int i = 0; i < cls->method_count; i++)
448 _Jv_Method *method = &cls->methods[i];
449 if ( (!_Jv_equalUtf8Consts (method->name,
451 || (!_Jv_equalUtf8Consts (method->signature,
455 if (_Jv_CheckAccess (klass, cls, method->accflags))
459 java::lang::StringBuffer *sb = new java::lang::StringBuffer();
460 sb->append(klass->getName());
461 sb->append(JvNewStringLatin1(": "));
462 sb->append(cls->getName());
463 sb->append(JvNewStringLatin1("."));
464 sb->append(_Jv_NewStringUTF(method_name->chars()));
465 sb->append(_Jv_NewStringUTF(method_signature->chars()));
466 throw new java::lang::IllegalAccessError (sb->toString());
473 #define INITIAL_IOFFSETS_LEN 4
474 #define INITIAL_IFACES_LEN 4
476 static _Jv_IDispatchTable null_idt = { {SHRT_MAX, 0, NULL} };
478 // Generate tables for constant-time assignment testing and interface
479 // method lookup. This implements the technique described by Per Bothner
480 // <per@bothner.com> on the java-discuss mailing list on 1999-09-02:
481 // http://gcc.gnu.org/ml/java/1999-q3/msg00377.html
483 _Jv_Linker::prepare_constant_time_tables (jclass klass)
485 if (klass->isPrimitive () || klass->isInterface ())
488 // Short-circuit in case we've been called already.
489 if ((klass->idt != NULL) || klass->depth != 0)
492 // Calculate the class depth and ancestor table. The depth of a class
493 // is how many "extends" it is removed from Object. Thus the depth of
494 // java.lang.Object is 0, but the depth of java.io.FilterOutputStream
495 // is 2. Depth is defined for all regular and array classes, but not
496 // interfaces or primitive types.
498 jclass klass0 = klass;
499 jboolean has_interfaces = 0;
500 while (klass0 != &java::lang::Object::class$)
502 has_interfaces += klass0->interface_count;
503 klass0 = klass0->superclass;
507 // We do class member testing in constant time by using a small table
508 // of all the ancestor classes within each class. The first element is
509 // a pointer to the current class, and the rest are pointers to the
510 // classes ancestors, ordered from the current class down by decreasing
511 // depth. We do not include java.lang.Object in the table of ancestors,
512 // since it is redundant.
514 // FIXME: _Jv_AllocBytes
515 klass->ancestors = (jclass *) _Jv_Malloc (klass->depth
518 for (int index = 0; index < klass->depth; index++)
520 klass->ancestors[index] = klass0;
521 klass0 = klass0->superclass;
524 if ((klass->accflags & java::lang::reflect::Modifier::ABSTRACT) != 0)
527 // Optimization: If class implements no interfaces, use a common
528 // predefined interface table.
531 klass->idt = &null_idt;
535 // FIXME: _Jv_AllocBytes
537 (_Jv_IDispatchTable *) _Jv_Malloc (sizeof (_Jv_IDispatchTable));
541 ifaces.len = INITIAL_IFACES_LEN;
542 ifaces.list = (jclass *) _Jv_Malloc (ifaces.len * sizeof (jclass *));
544 int itable_size = get_interfaces (klass, &ifaces);
546 if (ifaces.count > 0)
548 klass->idt->cls.itable =
549 // FIXME: _Jv_AllocBytes
550 (void **) _Jv_Malloc (itable_size * sizeof (void *));
551 klass->idt->cls.itable_length = itable_size;
553 jshort *itable_offsets =
554 (jshort *) _Jv_Malloc (ifaces.count * sizeof (jshort));
556 generate_itable (klass, &ifaces, itable_offsets);
558 jshort cls_iindex = find_iindex (ifaces.list, itable_offsets,
561 for (int i = 0; i < ifaces.count; i++)
563 ifaces.list[i]->idt->iface.ioffsets[cls_iindex] =
567 klass->idt->cls.iindex = cls_iindex;
569 _Jv_Free (ifaces.list);
570 _Jv_Free (itable_offsets);
574 klass->idt->cls.iindex = SHRT_MAX;
578 // Return index of item in list, or -1 if item is not present.
580 _Jv_Linker::indexof (void *item, void **list, jshort list_len)
582 for (int i=0; i < list_len; i++)
590 // Find all unique interfaces directly or indirectly implemented by klass.
591 // Returns the size of the interface dispatch table (itable) for klass, which
592 // is the number of unique interfaces plus the total number of methods that
593 // those interfaces declare. May extend ifaces if required.
595 _Jv_Linker::get_interfaces (jclass klass, _Jv_ifaces *ifaces)
599 for (int i = 0; i < klass->interface_count; i++)
601 jclass iface = klass->interfaces[i];
603 /* Make sure interface is linked. */
604 wait_for_state(iface, JV_STATE_LINKED);
606 if (indexof (iface, (void **) ifaces->list, ifaces->count) == -1)
608 if (ifaces->count + 1 >= ifaces->len)
610 /* Resize ifaces list */
611 ifaces->len = ifaces->len * 2;
613 = (jclass *) _Jv_Realloc (ifaces->list,
614 ifaces->len * sizeof(jclass));
616 ifaces->list[ifaces->count] = iface;
619 result += get_interfaces (klass->interfaces[i], ifaces);
623 if (klass->isInterface())
624 result += klass->method_count + 1;
625 else if (klass->superclass)
626 result += get_interfaces (klass->superclass, ifaces);
630 // Fill out itable in klass, resolving method declarations in each ifaces.
631 // itable_offsets is filled out with the position of each iface in itable,
632 // such that itable[itable_offsets[n]] == ifaces.list[n].
634 _Jv_Linker::generate_itable (jclass klass, _Jv_ifaces *ifaces,
635 jshort *itable_offsets)
637 void **itable = klass->idt->cls.itable;
638 jshort itable_pos = 0;
640 for (int i = 0; i < ifaces->count; i++)
642 jclass iface = ifaces->list[i];
643 itable_offsets[i] = itable_pos;
644 itable_pos = append_partial_itable (klass, iface, itable, itable_pos);
646 /* Create interface dispatch table for iface */
647 if (iface->idt == NULL)
649 // FIXME: _Jv_AllocBytes
651 = (_Jv_IDispatchTable *) _Jv_Malloc (sizeof (_Jv_IDispatchTable));
653 // The first element of ioffsets is its length (itself included).
654 // FIXME: _Jv_AllocBytes
655 jshort *ioffsets = (jshort *) _Jv_Malloc (INITIAL_IOFFSETS_LEN
657 ioffsets[0] = INITIAL_IOFFSETS_LEN;
658 for (int i = 1; i < INITIAL_IOFFSETS_LEN; i++)
661 iface->idt->iface.ioffsets = ioffsets;
666 // Format method name for use in error messages.
668 _Jv_GetMethodString (jclass klass, _Jv_Method *meth,
671 using namespace java::lang;
672 StringBuffer *buf = new StringBuffer (klass->name->toString());
673 buf->append (jchar ('.'));
674 buf->append (meth->name->toString());
675 buf->append ((jchar) ' ');
676 buf->append (meth->signature->toString());
679 buf->append(JvNewStringLatin1(" in "));
680 buf->append(derived->name->toString());
682 return buf->toString();
686 _Jv_ThrowNoSuchMethodError ()
688 throw new java::lang::NoSuchMethodError;
691 // Each superinterface of a class (i.e. each interface that the class
692 // directly or indirectly implements) has a corresponding "Partial
693 // Interface Dispatch Table" whose size is (number of methods + 1) words.
694 // The first word is a pointer to the interface (i.e. the java.lang.Class
695 // instance for that interface). The remaining words are pointers to the
696 // actual methods that implement the methods declared in the interface,
697 // in order of declaration.
699 // Append partial interface dispatch table for "iface" to "itable", at
700 // position itable_pos.
701 // Returns the offset at which the next partial ITable should be appended.
703 _Jv_Linker::append_partial_itable (jclass klass, jclass iface,
704 void **itable, jshort pos)
706 using namespace java::lang::reflect;
708 itable[pos++] = (void *) iface;
711 for (int j=0; j < iface->method_count; j++)
714 for (jclass cl = klass; cl; cl = cl->getSuperclass())
716 meth = _Jv_GetMethodLocal (cl, iface->methods[j].name,
717 iface->methods[j].signature);
723 if (meth && (meth->name->first() == '<'))
725 // leave a placeholder in the itable for hidden init methods.
730 if ((meth->accflags & Modifier::STATIC) != 0)
731 throw new java::lang::IncompatibleClassChangeError
732 (_Jv_GetMethodString (klass, meth));
733 if ((meth->accflags & Modifier::ABSTRACT) != 0)
734 throw new java::lang::AbstractMethodError
735 (_Jv_GetMethodString (klass, meth));
736 if ((meth->accflags & Modifier::PUBLIC) == 0)
737 throw new java::lang::IllegalAccessError
738 (_Jv_GetMethodString (klass, meth));
740 itable[pos] = meth->ncode;
744 // The method doesn't exist in klass. Binary compatibility rules
745 // permit this, so we delay the error until runtime using a pointer
746 // to a method which throws an exception.
747 itable[pos] = (void *) _Jv_ThrowNoSuchMethodError;
755 static _Jv_Mutex_t iindex_mutex;
756 static bool iindex_mutex_initialized = false;
758 // We need to find the correct offset in the Class Interface Dispatch
759 // Table for a given interface. Once we have that, invoking an interface
760 // method just requires combining the Method's index in the interface
761 // (known at compile time) to get the correct method. Doing a type test
762 // (cast or instanceof) is the same problem: Once we have a possible Partial
763 // Interface Dispatch Table, we just compare the first element to see if it
764 // matches the desired interface. So how can we find the correct offset?
765 // Our solution is to keep a vector of candiate offsets in each interface
766 // (idt->iface.ioffsets), and in each class we have an index
767 // (idt->cls.iindex) used to select the correct offset from ioffsets.
769 // Calculate and return iindex for a new class.
770 // ifaces is a vector of num interfaces that the class implements.
771 // offsets[j] is the offset in the interface dispatch table for the
772 // interface corresponding to ifaces[j].
773 // May extend the interface ioffsets if required.
775 _Jv_Linker::find_iindex (jclass *ifaces, jshort *offsets, jshort num)
780 // Acquire a global lock to prevent itable corruption in case of multiple
781 // classes that implement an intersecting set of interfaces being linked
782 // simultaneously. We can assume that the mutex will be initialized
784 if (! iindex_mutex_initialized)
786 _Jv_MutexInit (&iindex_mutex);
787 iindex_mutex_initialized = true;
790 _Jv_MutexLock (&iindex_mutex);
792 for (i=1;; i++) /* each potential position in ioffsets */
794 for (j=0;; j++) /* each iface */
798 if (i >= ifaces[j]->idt->iface.ioffsets[0])
800 int ioffset = ifaces[j]->idt->iface.ioffsets[i];
801 /* We can potentially share this position with another class. */
802 if (ioffset >= 0 && ioffset != offsets[j])
803 break; /* Nope. Try next i. */
807 for (j = 0; j < num; j++)
809 int len = ifaces[j]->idt->iface.ioffsets[0];
813 int newlen = 2 * len;
816 jshort *old_ioffsets = ifaces[j]->idt->iface.ioffsets;
817 // FIXME: _Jv_AllocBytes
818 jshort *new_ioffsets = (jshort *) _Jv_Malloc (newlen
820 memcpy (&new_ioffsets[1], &old_ioffsets[1],
821 (len - 1) * sizeof (jshort));
822 new_ioffsets[0] = newlen;
825 new_ioffsets[len++] = -1;
827 ifaces[j]->idt->iface.ioffsets = new_ioffsets;
829 ifaces[j]->idt->iface.ioffsets[i] = offsets[j];
832 _Jv_MutexUnlock (&iindex_mutex);
838 // Functions for indirect dispatch (symbolic virtual binding) support.
840 // There are three tables, atable otable and itable. atable is an
841 // array of addresses, and otable is an array of offsets, and these
842 // are used for static and virtual members respectively. itable is an
843 // array of pairs {address, index} where each address is a pointer to
846 // {a,o,i}table_syms is an array of _Jv_MethodSymbols. Each such
847 // symbol is a tuple of {classname, member name, signature}.
849 // Set this to true to enable debugging of indirect dispatch tables/linking.
850 static bool debug_link = false;
852 // link_symbol_table() scans these two arrays and fills in the
853 // corresponding atable and otable with the addresses of static
854 // members and the offsets of virtual members.
856 // The offset (in bytes) for each resolved method or field is placed
857 // at the corresponding position in the virtual method offset table
860 // The same otable and atable may be shared by many classes.
862 // This must be called while holding the class lock.
865 _Jv_Linker::link_symbol_table (jclass klass)
868 _Jv_MethodSymbol sym;
869 if (klass->otable == NULL
870 || klass->otable->state != 0)
873 klass->otable->state = 1;
876 fprintf (stderr, "Fixing up otable in %s:\n", klass->name->chars());
878 (sym = klass->otable_syms[index]).class_name != NULL;
881 jclass target_class = _Jv_FindClass (sym.class_name, klass->loader);
882 _Jv_Method *meth = NULL;
884 _Jv_Utf8Const *signature = sym.signature;
887 static char *bounce = (char *)_Jv_ThrowNoSuchMethodError;
888 ptrdiff_t offset = (char *)(klass->vtable) - bounce;
889 klass->otable->offsets[index] = offset;
892 if (target_class == NULL)
893 throw new java::lang::NoClassDefFoundError
894 (_Jv_NewStringUTF (sym.class_name->chars()));
896 // We're looking for a field or a method, and we can tell
897 // which is needed by looking at the signature.
898 if (signature->first() == '(' && signature->len() >= 2)
900 // Looks like someone is trying to invoke an interface method
901 if (target_class->isInterface())
903 using namespace java::lang;
904 StringBuffer *sb = new StringBuffer();
905 sb->append(JvNewStringLatin1("found interface "));
906 sb->append(target_class->getName());
907 sb->append(JvNewStringLatin1(" when searching for a class"));
908 throw new VerifyError(sb->toString());
911 // If the target class does not have a vtable_method_count yet,
912 // then we can't tell the offsets for its methods, so we must lay
914 wait_for_state(target_class, JV_STATE_PREPARED);
916 meth = _Jv_LookupDeclaredMethod(target_class, sym.name,
921 int offset = _Jv_VTable::idx_to_offset (meth->index);
923 JvFail ("Bad method index");
924 JvAssert (meth->index < target_class->vtable_method_count);
925 klass->otable->offsets[index] = offset;
928 fprintf (stderr, " offsets[%d] = %d (class %s@%p : %s(%s))\n",
930 (int)klass->otable->offsets[index],
931 (const char*)target_class->name->chars(),
933 (const char*)sym.name->chars(),
934 (const char*)signature->chars());
940 wait_for_state(target_class, JV_STATE_PREPARED);
941 _Jv_Field *the_field = find_field (klass, target_class,
942 sym.name, sym.signature);
943 if ((the_field->flags & java::lang::reflect::Modifier::STATIC))
944 throw new java::lang::IncompatibleClassChangeError;
946 klass->otable->offsets[index] = the_field->u.boffset;
951 if (klass->atable == NULL || klass->atable->state != 0)
954 klass->atable->state = 1;
957 (sym = klass->atable_syms[index]).class_name != NULL;
960 jclass target_class = _Jv_FindClass (sym.class_name, klass->loader);
961 _Jv_Method *meth = NULL;
962 _Jv_Utf8Const *signature = sym.signature;
964 // ??? Setting this pointer to null will at least get us a
965 // NullPointerException
966 klass->atable->addresses[index] = NULL;
968 if (target_class == NULL)
969 throw new java::lang::NoClassDefFoundError
970 (_Jv_NewStringUTF (sym.class_name->chars()));
972 // We're looking for a static field or a static method, and we
973 // can tell which is needed by looking at the signature.
974 if (signature->first() == '(' && signature->len() >= 2)
976 // If the target class does not have a vtable_method_count yet,
977 // then we can't tell the offsets for its methods, so we must lay
979 wait_for_state (target_class, JV_STATE_PREPARED);
981 // Interface methods cannot have bodies.
982 if (target_class->isInterface())
984 using namespace java::lang;
985 StringBuffer *sb = new StringBuffer();
986 sb->append(JvNewStringLatin1("class "));
987 sb->append(target_class->getName());
988 sb->append(JvNewStringLatin1(" is an interface: "
990 throw new VerifyError(sb->toString());
993 meth = _Jv_LookupDeclaredMethod(target_class, sym.name,
998 if (meth->ncode) // Maybe abstract?
1000 klass->atable->addresses[index] = meth->ncode;
1002 fprintf (stderr, " addresses[%d] = %p (class %s@%p : %s(%s))\n",
1004 &klass->atable->addresses[index],
1005 (const char*)target_class->name->chars(),
1007 (const char*)sym.name->chars(),
1008 (const char*)signature->chars());
1012 klass->atable->addresses[index]
1013 = (void *)_Jv_ThrowNoSuchMethodError;
1020 wait_for_state(target_class, JV_STATE_PREPARED);
1021 _Jv_Field *the_field = find_field (klass, target_class,
1022 sym.name, sym.signature);
1023 if ((the_field->flags & java::lang::reflect::Modifier::STATIC))
1024 klass->atable->addresses[index] = the_field->u.addr;
1026 throw new java::lang::IncompatibleClassChangeError;
1031 if (klass->itable == NULL
1032 || klass->itable->state != 0)
1035 klass->itable->state = 1;
1038 (sym = klass->itable_syms[index]).class_name != NULL;
1041 jclass target_class = _Jv_FindClass (sym.class_name, klass->loader);
1042 _Jv_Utf8Const *signature = sym.signature;
1047 wait_for_state(target_class, JV_STATE_LOADED);
1048 bool found = _Jv_getInterfaceMethod (target_class, cls, i,
1049 sym.name, sym.signature);
1053 klass->itable->addresses[index * 2] = cls;
1054 klass->itable->addresses[index * 2 + 1] = (void *)(unsigned long) i;
1057 fprintf (stderr, " interfaces[%d] = %p (interface %s@%p : %s(%s))\n",
1059 klass->itable->addresses[index * 2],
1060 (const char*)cls->name->chars(),
1062 (const char*)sym.name->chars(),
1063 (const char*)signature->chars());
1064 fprintf (stderr, " [%d] = offset %d\n",
1066 (int)(unsigned long)klass->itable->addresses[index * 2 + 1]);
1071 throw new java::lang::IncompatibleClassChangeError;
1076 // For each catch_record in the list of caught classes, fill in the
1079 _Jv_Linker::link_exception_table (jclass self)
1081 struct _Jv_CatchClass *catch_record = self->catch_classes;
1082 if (!catch_record || catch_record->classname)
1085 while (catch_record->classname)
1090 = _Jv_FindClass (catch_record->classname,
1091 self->getClassLoaderInternal ());
1092 *catch_record->address = target_class;
1094 catch (::java::lang::Throwable *t)
1096 // FIXME: We need to do something better here.
1097 *catch_record->address = 0;
1101 self->catch_classes->classname = (_Jv_Utf8Const *)-1;
1104 // This is put in empty vtable slots.
1106 _Jv_abstractMethodError (void)
1108 throw new java::lang::AbstractMethodError();
1111 // Set itable method indexes for members of interface IFACE.
1113 _Jv_Linker::layout_interface_methods (jclass iface)
1115 if (! iface->isInterface())
1118 // itable indexes start at 1.
1119 // FIXME: Static initalizers currently get a NULL placeholder entry in the
1120 // itable so they are also assigned an index here.
1121 for (int i = 0; i < iface->method_count; i++)
1122 iface->methods[i].index = i + 1;
1125 // Prepare virtual method declarations in KLASS, and any superclasses
1126 // as required, by determining their vtable index, setting
1127 // method->index, and finally setting the class's vtable_method_count.
1128 // Must be called with the lock for KLASS held.
1130 _Jv_Linker::layout_vtable_methods (jclass klass)
1132 if (klass->vtable != NULL || klass->isInterface()
1133 || klass->vtable_method_count != -1)
1136 jclass superclass = klass->getSuperclass();
1138 if (superclass != NULL && superclass->vtable_method_count == -1)
1140 JvSynchronize sync (superclass);
1141 layout_vtable_methods (superclass);
1144 int index = (superclass == NULL ? 0 : superclass->vtable_method_count);
1146 for (int i = 0; i < klass->method_count; ++i)
1148 _Jv_Method *meth = &klass->methods[i];
1149 _Jv_Method *super_meth = NULL;
1151 if (! _Jv_isVirtualMethod (meth))
1154 if (superclass != NULL)
1157 super_meth = _Jv_LookupDeclaredMethod (superclass, meth->name,
1158 meth->signature, &declarer);
1159 // See if this method actually overrides the other method
1163 if (! _Jv_isVirtualMethod (super_meth)
1164 || ! _Jv_CheckAccess (klass, declarer,
1165 super_meth->accflags))
1167 else if ((super_meth->accflags
1168 & java::lang::reflect::Modifier::FINAL) != 0)
1170 using namespace java::lang;
1171 StringBuffer *sb = new StringBuffer();
1172 sb->append(JvNewStringLatin1("method "));
1173 sb->append(_Jv_GetMethodString(klass, meth));
1174 sb->append(JvNewStringLatin1(" overrides final method "));
1175 sb->append(_Jv_GetMethodString(declarer, super_meth));
1176 throw new VerifyError(sb->toString());
1182 meth->index = super_meth->index;
1184 meth->index = index++;
1187 klass->vtable_method_count = index;
1190 // Set entries in VTABLE for virtual methods declared in KLASS.
1192 _Jv_Linker::set_vtable_entries (jclass klass, _Jv_VTable *vtable)
1194 for (int i = klass->method_count - 1; i >= 0; i--)
1196 using namespace java::lang::reflect;
1198 _Jv_Method *meth = &klass->methods[i];
1199 if (meth->index == (_Jv_ushort) -1)
1201 if ((meth->accflags & Modifier::ABSTRACT))
1202 vtable->set_method(meth->index, (void *) &_Jv_abstractMethodError);
1204 vtable->set_method(meth->index, meth->ncode);
1208 // Allocate and lay out the virtual method table for KLASS. This will
1209 // also cause vtables to be generated for any non-abstract
1210 // superclasses, and virtual method layout to occur for any abstract
1211 // superclasses. Must be called with monitor lock for KLASS held.
1213 _Jv_Linker::make_vtable (jclass klass)
1215 using namespace java::lang::reflect;
1217 // If the vtable exists, or for interface classes, do nothing. All
1218 // other classes, including abstract classes, need a vtable.
1219 if (klass->vtable != NULL || klass->isInterface())
1222 // Ensure all the `ncode' entries are set.
1223 klass->engine->create_ncode(klass);
1225 // Class must be laid out before we can create a vtable.
1226 if (klass->vtable_method_count == -1)
1227 layout_vtable_methods (klass);
1229 // Allocate the new vtable.
1230 _Jv_VTable *vtable = _Jv_VTable::new_vtable (klass->vtable_method_count);
1231 klass->vtable = vtable;
1233 // Copy the vtable of the closest superclass.
1234 jclass superclass = klass->superclass;
1236 JvSynchronize sync (superclass);
1237 make_vtable (superclass);
1239 for (int i = 0; i < superclass->vtable_method_count; ++i)
1240 vtable->set_method (i, superclass->vtable->get_method (i));
1242 // Set the class pointer and GC descriptor.
1243 vtable->clas = klass;
1244 vtable->gc_descr = _Jv_BuildGCDescr (klass);
1246 // For each virtual declared in klass, set new vtable entry or
1247 // override an old one.
1248 set_vtable_entries (klass, vtable);
1250 // It is an error to have an abstract method in a concrete class.
1251 if (! (klass->accflags & Modifier::ABSTRACT))
1253 for (int i = 0; i < klass->vtable_method_count; ++i)
1254 if (vtable->get_method(i) == (void *) &_Jv_abstractMethodError)
1256 using namespace java::lang;
1257 jclass orig = klass;
1258 while (klass != NULL)
1260 for (int j = 0; j < klass->method_count; ++j)
1262 if (klass->methods[j].index == i)
1263 throw new AbstractMethodError(_Jv_GetMethodString(klass,
1267 klass = klass->getSuperclass ();
1269 // Couldn't find the name, which is weird.
1270 // But we still must throw the error.
1271 throw new AbstractMethodError ();
1276 // Lay out the class, allocating space for static fields and computing
1277 // offsets of instance fields. The class lock must be held by the
1280 _Jv_Linker::ensure_fields_laid_out (jclass klass)
1282 if (klass->size_in_bytes != -1)
1285 // Compute the alignment for this type by searching through the
1286 // superclasses and finding the maximum required alignment. We
1287 // could consider caching this in the Class.
1288 int max_align = __alignof__ (java::lang::Object);
1289 jclass super = klass->getSuperclass();
1290 while (super != NULL)
1292 // Ensure that our super has its super installed before
1294 wait_for_state(super, JV_STATE_LOADING);
1295 ensure_fields_laid_out(super);
1296 int num = JvNumInstanceFields (super);
1297 _Jv_Field *field = JvGetFirstInstanceField (super);
1300 int field_align = get_alignment_from_class (field->type);
1301 if (field_align > max_align)
1302 max_align = field_align;
1306 super = super->getSuperclass();
1310 int static_size = 0;
1312 // Although java.lang.Object is never interpreted, an interface can
1313 // have a null superclass. Note that we have to lay out an
1314 // interface because it might have static fields.
1315 if (klass->superclass)
1316 instance_size = klass->superclass->size();
1318 instance_size = java::lang::Object::class$.size();
1320 for (int i = 0; i < klass->field_count; i++)
1325 _Jv_Field *field = &klass->fields[i];
1327 if (! field->isRef ())
1329 // It is safe to resolve the field here, since it's a
1330 // primitive class, which does not cause loading to happen.
1331 resolve_field (field, klass->loader);
1333 field_size = field->type->size ();
1334 field_align = get_alignment_from_class (field->type);
1338 field_size = sizeof (jobject);
1339 field_align = __alignof__ (jobject);
1342 field->bsize = field_size;
1344 if ((field->flags & java::lang::reflect::Modifier::STATIC))
1346 if (field->u.addr == NULL)
1348 // This computes an offset into a region we'll allocate
1349 // shortly, and then add this offset to the start
1351 static_size = ROUND (static_size, field_align);
1352 field->u.boffset = static_size;
1353 static_size += field_size;
1358 instance_size = ROUND (instance_size, field_align);
1359 field->u.boffset = instance_size;
1360 instance_size += field_size;
1361 if (field_align > max_align)
1362 max_align = field_align;
1366 if (static_size != 0)
1367 klass->engine->allocate_static_fields (klass, static_size);
1369 // Set the instance size for the class. Note that first we round it
1370 // to the alignment required for this object; this keeps us in sync
1371 // with our current ABI.
1372 instance_size = ROUND (instance_size, max_align);
1373 klass->size_in_bytes = instance_size;
1376 // This takes the class to state JV_STATE_LINKED. The class lock must
1377 // be held when calling this.
1379 _Jv_Linker::ensure_class_linked (jclass klass)
1381 if (klass->state >= JV_STATE_LINKED)
1384 int state = klass->state;
1387 // Short-circuit, so that mutually dependent classes are ok.
1388 klass->state = JV_STATE_LINKED;
1390 _Jv_Constants *pool = &klass->constants;
1392 // Compiled classes require that their class constants be
1393 // resolved here. However, interpreted classes need their
1394 // constants to be resolved lazily. If we resolve an
1395 // interpreted class' constants eagerly, we can end up with
1396 // spurious IllegalAccessErrors when the constant pool contains
1397 // a reference to a class we can't access. This can validly
1398 // occur in an obscure case involving the InnerClasses
1401 if (! _Jv_IsInterpretedClass (klass))
1404 // Resolve class constants first, since other constant pool
1405 // entries may rely on these.
1406 for (int index = 1; index < pool->size; ++index)
1408 if (pool->tags[index] == JV_CONSTANT_Class)
1409 resolve_pool_entry (klass, index);
1413 #if 0 // Should be redundant now
1414 // If superclass looks like a constant pool entry,
1416 if ((uaddr) klass->superclass < (uaddr) pool->size)
1417 klass->superclass = pool->data[(uaddr) klass->superclass].clazz;
1419 // Likewise for interfaces.
1420 for (int i = 0; i < klass->interface_count; i++)
1422 if ((uaddr) klass->interfaces[i] < (uaddr) pool->size)
1423 klass->interfaces[i]
1424 = pool->data[(uaddr) klass->interfaces[i]].clazz;
1428 // Resolve the remaining constant pool entries.
1429 for (int index = 1; index < pool->size; ++index)
1431 if (pool->tags[index] == JV_CONSTANT_String)
1435 str = _Jv_NewStringUtf8Const (pool->data[index].utf8);
1436 pool->data[index].o = str;
1437 pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
1441 if (klass->engine->need_resolve_string_fields())
1443 jfieldID f = JvGetFirstStaticField (klass);
1444 for (int n = JvNumStaticFields (klass); n > 0; --n)
1446 int mod = f->getModifiers ();
1447 // If we have a static String field with a non-null initial
1448 // value, we know it points to a Utf8Const.
1449 resolve_field(f, klass->loader);
1450 if (f->getClass () == &java::lang::String::class$
1451 && (mod & java::lang::reflect::Modifier::STATIC) != 0)
1453 jstring *strp = (jstring *) f->u.addr;
1455 *strp = _Jv_NewStringUtf8Const ((_Jv_Utf8Const *) *strp);
1457 f = f->getNextField ();
1461 klass->notifyAll ();
1463 _Jv_PushClass (klass);
1465 catch (java::lang::Throwable *t)
1467 klass->state = state;
1472 // This ensures that symbolic superclass and superinterface references
1473 // are resolved for the indicated class. This must be called with the
1476 _Jv_Linker::ensure_supers_installed (jclass klass)
1478 resolve_class_ref (klass, &klass->superclass);
1479 // An interface won't have a superclass.
1480 if (klass->superclass)
1481 wait_for_state (klass->superclass, JV_STATE_LOADING);
1483 for (int i = 0; i < klass->interface_count; ++i)
1485 resolve_class_ref (klass, &klass->interfaces[i]);
1486 wait_for_state (klass->interfaces[i], JV_STATE_LOADING);
1490 // This adds missing `Miranda methods' to a class.
1492 _Jv_Linker::add_miranda_methods (jclass base, jclass iface_class)
1494 // Note that at this point, all our supers, and the supers of all
1495 // our superclasses and superinterfaces, will have been installed.
1497 for (int i = 0; i < iface_class->interface_count; ++i)
1499 jclass interface = iface_class->interfaces[i];
1501 for (int j = 0; j < interface->method_count; ++j)
1503 _Jv_Method *meth = &interface->methods[j];
1504 // Don't bother with <clinit>.
1505 if (meth->name->first() == '<')
1507 _Jv_Method *new_meth = _Jv_LookupDeclaredMethod (base, meth->name,
1511 // We assume that such methods are very unlikely, so we
1512 // just reallocate the method array each time one is
1513 // found. This greatly simplifies the searching --
1514 // otherwise we have to make sure that each such method
1515 // found is really unique among all superinterfaces.
1516 int new_count = base->method_count + 1;
1518 = (_Jv_Method *) _Jv_AllocBytes (sizeof (_Jv_Method)
1520 memcpy (new_m, base->methods,
1521 sizeof (_Jv_Method) * base->method_count);
1524 new_m[base->method_count] = *meth;
1525 new_m[base->method_count].index = (_Jv_ushort) -1;
1526 new_m[base->method_count].accflags
1527 |= java::lang::reflect::Modifier::INVISIBLE;
1529 base->methods = new_m;
1530 base->method_count = new_count;
1534 wait_for_state (interface, JV_STATE_LOADED);
1535 add_miranda_methods (base, interface);
1539 // This ensures that the class' method table is "complete". This must
1540 // be called with the class lock held.
1542 _Jv_Linker::ensure_method_table_complete (jclass klass)
1544 if (klass->vtable != NULL || klass->isInterface())
1547 // We need our superclass to have its own Miranda methods installed.
1548 wait_for_state (klass->getSuperclass (), JV_STATE_LOADED);
1550 // A class might have so-called "Miranda methods". This is a method
1551 // that is declared in an interface and not re-declared in an
1552 // abstract class. Some compilers don't emit declarations for such
1553 // methods in the class; this will give us problems since we expect
1554 // a declaration for any method requiring a vtable entry. We handle
1555 // this here by searching for such methods and constructing new
1556 // internal declarations for them. Note that we do this
1557 // unconditionally, and not just for abstract classes, to correctly
1558 // account for cases where a class is modified to be concrete and
1559 // still incorrectly inherits an abstract method.
1560 int pre_count = klass->method_count;
1561 add_miranda_methods (klass, klass);
1563 // Let the execution engine know that we've added methods.
1564 if (klass->method_count != pre_count)
1565 klass->engine->post_miranda_hook(klass);
1568 // Verify a class. Must be called with class lock held.
1570 _Jv_Linker::verify_class (jclass klass)
1572 klass->engine->verify(klass);
1575 // Check the assertions contained in the type assertion table for KLASS.
1576 // This is the equivilent of bytecode verification for native, BC-ABI code.
1578 _Jv_Linker::verify_type_assertions (jclass klass)
1581 fprintf (stderr, "Evaluating type assertions for %s:\n",
1582 klass->name->chars());
1584 if (klass->assertion_table == NULL)
1587 for (int i = 0;; i++)
1589 int assertion_code = klass->assertion_table[i].assertion_code;
1590 _Jv_Utf8Const *op1 = klass->assertion_table[i].op1;
1591 _Jv_Utf8Const *op2 = klass->assertion_table[i].op2;
1593 if (assertion_code == JV_ASSERT_END_OF_TABLE)
1595 else if (assertion_code == JV_ASSERT_TYPES_COMPATIBLE)
1599 fprintf (stderr, " code=%i, operand A=%s B=%s\n",
1600 assertion_code, op1->chars(), op2->chars());
1603 // The operands are class signatures. op1 is the source,
1604 // op2 is the target.
1605 jclass cl1 = _Jv_FindClassFromSignature (op1->chars(),
1606 klass->getClassLoaderInternal());
1607 jclass cl2 = _Jv_FindClassFromSignature (op2->chars(),
1608 klass->getClassLoaderInternal());
1610 // If the class doesn't exist, ignore the assertion. An exception
1611 // will be thrown later if an attempt is made to actually
1612 // instantiate the class.
1613 if (cl1 == NULL || cl2 == NULL)
1616 if (! _Jv_IsAssignableFromSlow (cl2, cl1))
1618 jstring s = JvNewStringUTF ("Incompatible types: In class ");
1619 s = s->concat (klass->getName());
1620 s = s->concat (JvNewStringUTF (": "));
1621 s = s->concat (cl1->getName());
1622 s = s->concat (JvNewStringUTF (" is not assignable to "));
1623 s = s->concat (cl2->getName());
1624 throw new java::lang::VerifyError (s);
1627 else if (assertion_code == JV_ASSERT_IS_INSTANTIABLE)
1629 // TODO: Implement this.
1631 // Unknown assertion codes are ignored, for forwards-compatibility.
1636 _Jv_Linker::print_class_loaded (jclass klass)
1638 char *codesource = NULL;
1639 if (klass->protectionDomain != NULL)
1641 java::security::CodeSource *cs
1642 = klass->protectionDomain->getCodeSource();
1645 jstring css = cs->toString();
1646 int len = JvGetStringUTFLength(css);
1647 codesource = (char *) _Jv_AllocBytes(len + 1);
1648 JvGetStringUTFRegion(css, 0, css->length(), codesource);
1649 codesource[len] = '\0';
1652 if (codesource == NULL)
1653 codesource = "<no code source>";
1655 // We use a somewhat bogus test for the ABI here.
1658 if (_Jv_IsInterpretedClass (klass))
1663 else if (klass->state == JV_STATE_PRELOADING)
1664 abi = "BC-compiled";
1666 abi = "pre-compiled";
1668 fprintf (stderr, "[Loaded (%s) %s from %s]\n", abi, klass->name->chars(),
1672 // FIXME: mention invariants and stuff.
1674 _Jv_Linker::wait_for_state (jclass klass, int state)
1676 if (klass->state >= state)
1679 JvSynchronize sync (klass);
1681 // This is similar to the strategy for class initialization. If we
1682 // already hold the lock, just leave.
1683 java::lang::Thread *self = java::lang::Thread::currentThread();
1684 while (klass->state <= state
1686 && klass->thread != self)
1689 java::lang::Thread *save = klass->thread;
1690 klass->thread = self;
1692 // Print some debugging info if requested. Interpreted classes are
1693 // handled in defineclass, so we only need to handle the two
1694 // pre-compiled cases here.
1695 if (gcj::verbose_class_flag
1696 && (klass->state == JV_STATE_COMPILED
1697 || klass->state == JV_STATE_PRELOADING)
1699 && ! _Jv_IsInterpretedClass (klass)
1702 print_class_loaded (klass);
1706 if (state >= JV_STATE_LOADING && klass->state < JV_STATE_LOADING)
1708 ensure_supers_installed (klass);
1709 klass->set_state(JV_STATE_LOADING);
1712 if (state >= JV_STATE_LOADED && klass->state < JV_STATE_LOADED)
1714 ensure_method_table_complete (klass);
1715 klass->set_state(JV_STATE_LOADED);
1718 if (state >= JV_STATE_PREPARED && klass->state < JV_STATE_PREPARED)
1720 ensure_fields_laid_out (klass);
1721 make_vtable (klass);
1722 layout_interface_methods (klass);
1723 prepare_constant_time_tables (klass);
1724 klass->set_state(JV_STATE_PREPARED);
1727 if (state >= JV_STATE_LINKED && klass->state < JV_STATE_LINKED)
1729 verify_class (klass);
1731 ensure_class_linked (klass);
1732 link_exception_table (klass);
1733 link_symbol_table (klass);
1734 klass->set_state(JV_STATE_LINKED);
1737 catch (java::lang::Throwable *exc)
1739 klass->thread = save;
1740 klass->set_state(JV_STATE_ERROR);
1744 klass->thread = save;
1746 if (klass->state == JV_STATE_ERROR)
1747 throw new java::lang::LinkageError;