1 /* src/vm/linker.cpp - class linker functions
3 Copyright (C) 1996, 2011
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
33 #include "mm/memory.hpp"
35 #include "native/native.hpp"
37 #include "threads/lock.hpp"
38 #include "threads/mutex.hpp"
40 #include "toolbox/logging.hpp"
42 #include "vm/access.hpp"
43 #include "vm/array.hpp"
44 #include "vm/class.hpp"
45 #include "vm/classcache.hpp"
46 #include "vm/exceptions.hpp"
47 #include "vm/globals.hpp"
48 #include "vm/hook.hpp"
49 #include "vm/loader.hpp"
50 #include "vm/options.h"
51 #include "vm/primitive.hpp"
52 #include "vm/rt-timing.h"
53 #include "vm/string.hpp"
56 #include "vm/jit/asmpart.h"
57 #include "vm/jit/stubs.hpp"
63 /* debugging macros ***********************************************************/
66 # define TRACELINKCLASS(c) \
68 if (opt_TraceLinkClass) { \
70 log_print("[Linking "); \
77 # define TRACELINKCLASS(c)
81 /* #include "vm/resolve.hpp" */
82 /* copied prototype to avoid bootstrapping problem: */
83 classinfo *resolve_classref_or_classinfo_eager(classref_or_classinfo cls, bool checkaccess);
85 #if defined(ENABLE_STATISTICS)
86 # include "vm/statistics.h"
89 #if !defined(NDEBUG) && defined(ENABLE_INLINING)
90 #define INLINELOG(code) do { if (opt_TraceInlining) { code } } while (0)
92 #define INLINELOG(code)
96 /* global variables ***********************************************************/
98 static s4 interfaceindex; /* sequential numbering of interfaces */
101 #if !USES_NEW_SUBTYPE
102 Mutex *linker_classrenumber_lock;
105 #if defined(__cplusplus)
109 /* private functions **********************************************************/
111 static classinfo *link_class_intern(classinfo *c);
112 static arraydescriptor *link_array(classinfo *c);
113 static void linker_compute_class_values(classinfo *c);
114 static void linker_compute_subclasses(classinfo *c);
115 static bool linker_addinterface(classinfo *c, classinfo *ic);
116 static s4 class_highestinterface(classinfo *c);
119 typedef std::vector<std::pair<java_object_t**, utf*> > deferred_strings_vec_t;
120 static deferred_strings_vec_t deferred_strings;
122 /* linker_init *****************************************************************
124 Initializes the linker subsystem and links classes required for the
127 *******************************************************************************/
129 void linker_preinit(void)
131 TRACESUBSYSTEMINITIALIZATION("linker_preinit");
133 /* Reset interface index. */
137 #if defined(ENABLE_THREADS) && !USES_NEW_SUBTYPE
138 /* create the global mutex */
140 linker_classrenumber_lock = new Mutex();
143 /* Link the most basic classes. */
145 if (!link_class(class_java_lang_Object))
146 vm_abort("linker_preinit: linking java/lang/Object failed");
148 #if defined(ENABLE_JAVASE)
149 if (!link_class(class_java_lang_Cloneable))
150 vm_abort("linker_preinit: linking java/lang/Cloneable failed");
152 if (!link_class(class_java_io_Serializable))
153 vm_abort("linker_preinit: linking java/io/Serializable failed");
158 /* linker_init *****************************************************************
160 Links all classes required in the VM.
162 *******************************************************************************/
164 void linker_init(void)
166 TRACESUBSYSTEMINITIALIZATION("linker_init");
168 /* Link java.lang.Class as first class of the system, because we
169 need it's vftbl for all other classes so we can use a class as
172 if (!link_class(class_java_lang_Class))
173 vm_abort("linker_init: linking java/lang/Class failed");
175 /* Now set the header.vftbl of all classes which were created
176 before java.lang.Class was linked. */
178 class_postset_header_vftbl();
180 /* Link primitive-type wrapping classes. */
182 #if defined(ENABLE_JAVASE)
183 if (!link_class(class_java_lang_Void))
184 vm_abort("linker_init: linking failed");
187 if (!link_class(class_java_lang_Boolean))
188 vm_abort("linker_init: linking failed");
190 if (!link_class(class_java_lang_Byte))
191 vm_abort("linker_init: linking failed");
193 if (!link_class(class_java_lang_Character))
194 vm_abort("linker_init: linking failed");
196 if (!link_class(class_java_lang_Short))
197 vm_abort("linker_init: linking failed");
199 if (!link_class(class_java_lang_Integer))
200 vm_abort("linker_init: linking failed");
202 if (!link_class(class_java_lang_Long))
203 vm_abort("linker_init: linking failed");
205 if (!link_class(class_java_lang_Float))
206 vm_abort("linker_init: linking failed");
208 if (!link_class(class_java_lang_Double))
209 vm_abort("linker_init: linking failed");
211 /* Link important system classes. */
213 if (!link_class(class_java_lang_String))
214 vm_abort("linker_init: linking java/lang/String failed");
216 #if defined(ENABLE_JAVASE)
217 if (!link_class(class_java_lang_ClassLoader))
218 vm_abort("linker_init: linking failed");
220 if (!link_class(class_java_lang_SecurityManager))
221 vm_abort("linker_init: linking failed");
224 if (!link_class(class_java_lang_System))
225 vm_abort("linker_init: linking failed");
227 if (!link_class(class_java_lang_Thread))
228 vm_abort("linker_init: linking failed");
230 #if defined(ENABLE_JAVASE)
231 if (!link_class(class_java_lang_ThreadGroup))
232 vm_abort("linker_init: linking failed");
235 if (!link_class(class_java_lang_Throwable))
236 vm_abort("linker_init: linking failed");
238 #if defined(WITH_JAVA_RUNTIME_LIBRARY_GNU_CLASSPATH)
239 if (!link_class(class_java_lang_VMSystem))
240 vm_abort("linker_init: linking failed");
242 if (!link_class(class_java_lang_VMThread))
243 vm_abort("linker_init: linking failed");
245 if (!link_class(class_java_lang_VMThrowable))
246 vm_abort("linker_init: linking failed");
249 /* Important system exceptions. */
251 if (!link_class(class_java_lang_Exception))
252 vm_abort("linker_init: linking failed");
254 if (!link_class(class_java_lang_ClassNotFoundException))
255 vm_abort("linker_init: linking failed");
257 if (!link_class(class_java_lang_RuntimeException))
258 vm_abort("linker_init: linking failed");
260 /* some classes which may be used more often */
262 #if defined(ENABLE_JAVASE)
263 if (!link_class(class_java_lang_StackTraceElement))
264 vm_abort("linker_init: linking failed");
266 if (!link_class(class_java_lang_reflect_Constructor))
267 vm_abort("linker_init: linking failed");
269 if (!link_class(class_java_lang_reflect_Field))
270 vm_abort("linker_init: linking failed");
272 if (!link_class(class_java_lang_reflect_Method))
273 vm_abort("linker_init: linking failed");
275 # if defined(WITH_JAVA_RUNTIME_LIBRARY_GNU_CLASSPATH)
276 if (!link_class(class_java_lang_reflect_VMConstructor))
277 vm_abort("linker_init: linking failed");
279 if (!link_class(class_java_lang_reflect_VMField))
280 vm_abort("linker_init: linking failed");
282 if (!link_class(class_java_lang_reflect_VMMethod))
283 vm_abort("linker_init: linking failed");
286 if (!link_class(class_java_security_PrivilegedAction))
287 vm_abort("linker_init: linking failed");
289 if (!link_class(class_java_util_Vector))
290 vm_abort("linker_init: linking failed");
292 if (!link_class(class_java_util_HashMap))
293 vm_abort("linker_init: linking failed");
295 # if defined(WITH_JAVA_RUNTIME_LIBRARY_OPENJDK)
296 if (!link_class(class_sun_misc_Signal))
297 vm_abort("linker_init: linking failed");
299 if (!link_class(class_sun_reflect_MagicAccessorImpl))
300 vm_abort("linker_init: linking failed");
303 if (!link_class(arrayclass_java_lang_Object))
304 vm_abort("linker_init: linking failed");
308 /* create pseudo classes used by the typechecker */
310 /* pseudo class for Arraystubs (extends java.lang.Object) */
312 pseudo_class_Arraystub =
313 class_create_classinfo(utf_new_char("$ARRAYSTUB$"));
314 pseudo_class_Arraystub->state |= CLASS_LOADED;
315 pseudo_class_Arraystub->super = class_java_lang_Object;
317 #if defined(ENABLE_JAVASE)
319 pseudo_class_Arraystub->interfacescount = 2;
320 pseudo_class_Arraystub->interfaces = MNEW(classinfo*, 2);
321 pseudo_class_Arraystub->interfaces[0] = class_java_lang_Cloneable;
322 pseudo_class_Arraystub->interfaces[1] = class_java_io_Serializable;
324 #elif defined(ENABLE_JAVAME_CLDC1_1)
326 pseudo_class_Arraystub->interfacescount = 0;
327 pseudo_class_Arraystub->interfaces = NULL;
330 # error unknown Java configuration
333 if (!classcache_store_unique(pseudo_class_Arraystub))
334 vm_abort("linker_init: could not cache pseudo_class_Arraystub");
336 if (!link_class(pseudo_class_Arraystub))
337 vm_abort("linker_init: linking pseudo_class_Arraystub failed");
339 /* pseudo class representing the null type */
341 pseudo_class_Null = class_create_classinfo(utf_new_char("$NULL$"));
342 pseudo_class_Null->state |= CLASS_LOADED;
343 pseudo_class_Null->super = class_java_lang_Object;
345 if (!classcache_store_unique(pseudo_class_Null))
346 vm_abort("linker_init: could not cache pseudo_class_Null");
348 if (!link_class(pseudo_class_Null))
349 vm_abort("linker_init: linking failed");
351 /* pseudo class representing new uninitialized objects */
353 pseudo_class_New = class_create_classinfo(utf_new_char("$NEW$"));
354 pseudo_class_New->state |= CLASS_LOADED;
355 pseudo_class_New->state |= CLASS_LINKED; /* XXX is this allright? */
356 pseudo_class_New->super = class_java_lang_Object;
358 if (!classcache_store_unique(pseudo_class_New))
359 vm_abort("linker_init: could not cache pseudo_class_New");
361 /* Correct vftbl-entries (retarded loading and linking of class
362 java/lang/String). */
364 stringtable_update();
368 /* link_class ******************************************************************
370 Wrapper function for link_class_intern to ease monitor enter/exit
371 and exception handling.
373 *******************************************************************************/
375 classinfo *link_class(classinfo *c)
378 #if defined(ENABLE_RT_TIMING)
379 struct timespec time_start, time_end;
382 RT_TIMING_GET_TIME(time_start);
385 exceptions_throw_nullpointerexception();
389 LOCK_MONITOR_ENTER(c);
391 /* Maybe the class is currently linking or is already linked.*/
393 if ((c->state & CLASS_LINKING) || (c->state & CLASS_LINKED)) {
394 LOCK_MONITOR_EXIT(c);
399 #if defined(ENABLE_STATISTICS)
402 if (opt_getcompilingtime)
403 compilingtime_stop();
405 if (opt_getloadingtime)
409 /* call the internal function */
411 r = link_class_intern(c);
413 /* If return value is NULL, we had a problem and the class is not
417 c->state &= ~CLASS_LINKING;
419 #if defined(ENABLE_STATISTICS)
422 if (opt_getloadingtime)
425 if (opt_getcompilingtime)
426 compilingtime_start();
429 LOCK_MONITOR_EXIT(c);
431 RT_TIMING_GET_TIME(time_end);
433 RT_TIMING_TIME_DIFF(time_start,time_end,RT_TIMING_LINK_TOTAL);
435 // Hook point just after a class was linked.
436 if (!Hook::class_linked(r))
443 /* linker_overwrite_method *****************************************************
445 Overwrite a method with another one, update method flags and check
449 mg................the general method being overwritten
450 ms................the overwriting (more specialized) method
451 wl................worklist where to add invalidated methods
454 true..............everything ok
455 false.............an exception has been thrown
457 *******************************************************************************/
459 static bool linker_overwrite_method(methodinfo *mg,
461 method_worklist **wl)
469 /* overriding a final method is illegal */
471 if (mg->flags & ACC_FINAL) {
472 exceptions_throw_verifyerror(mg, "Overriding final method");
476 /* method ms overwrites method mg */
478 #if defined(ENABLE_VERIFIER)
479 /* Add loading constraints (for the more general types of method mg). */
480 /* Not for <init>, as it is not invoked virtually. */
482 if ((ms->name != utf_init)
483 && !classcache_add_constraints_for_params(
484 cs->classloader, cg->classloader, mg))
490 /* inherit the vftbl index, and record the overwriting */
492 ms->vftblindex = mg->vftblindex;
495 /* update flags and check assumptions */
496 /* <init> methods are a special case, as they are never dispatched dynamically */
498 if ((ms->flags & ACC_METHOD_IMPLEMENTED) && ms->name != utf_init) {
501 #if defined(ENABLE_TLH)
502 if (mg->flags & ACC_METHOD_MONOMORPHY_USED) {
503 printf("%s/%s is evil! the siner is %s/%s\n", mg->clazz->name->text, mg->name->text,
504 ms->clazz->name->text, ms->name->text);
505 ms->flags |= ACC_METHOD_PARENT_MONOMORPHY_USED;
509 if (mg->flags & ACC_METHOD_IMPLEMENTED) {
510 /* this adds another implementation */
512 mg->flags &= ~ACC_METHOD_MONOMORPHIC;
514 INLINELOG( printf("becomes polymorphic: "); method_println(mg); );
516 method_break_assumption_monomorphic(mg, wl);
519 /* this is the first implementation */
521 mg->flags |= ACC_METHOD_IMPLEMENTED;
523 INLINELOG( printf("becomes implemented: "); method_println(mg); );
528 } while (mg != NULL);
536 /* build_display ***************************************************************
538 Builds the entire display for a class. This entails filling the fixed part
539 as well as allocating and initializing the overflow part.
541 See Cliff Click and John Rose: Fast subtype checking in the Hotspot JVM.
543 *******************************************************************************/
545 static classinfo *build_display(classinfo *c)
553 if (c->vftbl->arraydesc) {
554 arraydescriptor *a = c->vftbl->arraydesc;
555 if (a->elementvftbl && a->elementvftbl->clazz->super) {
556 classinfo *cls = a->elementvftbl->clazz->super;
558 for (n=0; n<a->dimension; n++)
559 cls = class_array_of(cls, true);
563 if (a->componentvftbl && a->elementvftbl) {
564 super = a->componentvftbl->clazz;
568 /* Normal classes. */
572 if (!link_class(super))
574 depth = super->vftbl->subtype_depth + 1;
576 /* java.lang.Object doesn't have a super class. */
579 /* Now copy super's display, append c->vftbl and initialize the remaining fields. */
580 if (depth >= DISPLAY_SIZE) {
581 c->vftbl->subtype_overflow = MNEW(vftbl_t *, depth - DISPLAY_SIZE + 1);
582 #if defined(ENABLE_STATISTICS)
584 count_vftbl_len += sizeof(vftbl_t*) * (depth - DISPLAY_SIZE + 1);
586 memcpy(c->vftbl->subtype_overflow, super->vftbl->subtype_overflow, sizeof(vftbl_t*) * (depth - DISPLAY_SIZE));
587 c->vftbl->subtype_overflow[depth - DISPLAY_SIZE] = c->vftbl;
588 depth_fixed = DISPLAY_SIZE;
592 c->vftbl->subtype_display[depth] = c->vftbl;
596 memcpy(c->vftbl->subtype_display, super->vftbl->subtype_display, sizeof(vftbl_t*) * depth_fixed);
597 for (i=depth_fixed+1; i<=DISPLAY_SIZE; i++)
598 c->vftbl->subtype_display[i] = NULL;
599 c->vftbl->subtype_offset = OFFSET(vftbl_t, subtype_display[0]) + sizeof(vftbl_t*) * depth_fixed;
600 c->vftbl->subtype_depth = depth;
606 /* link_class_intern ***********************************************************
608 Tries to link a class. The function calculates the length in bytes
609 that an instance of this class requires as well as the VTBL for
610 methods and interface methods.
612 *******************************************************************************/
614 static classinfo *link_class_intern(classinfo *c)
616 classinfo *super; /* super class */
617 classinfo *tc; /* temporary class variable */
618 s4 supervftbllength; /* vftbllegnth of super class */
619 s4 vftbllength; /* vftbllength of current class */
620 s4 interfacetablelength; /* interface table length */
621 vftbl_t *v; /* vftbl of current class */
622 s4 i; /* interface/method/field counter */
623 arraydescriptor *arraydesc; /* descriptor for array classes */
624 method_worklist *worklist; /* worklist for recompilation */
625 #if defined(ENABLE_RT_TIMING)
626 struct timespec time_start, time_resolving, time_compute_vftbl,
627 time_abstract, time_compute_iftbl, time_fill_vftbl,
628 time_offsets, time_fill_iftbl, time_finalizer,
632 RT_TIMING_GET_TIME(time_start);
636 /* the class must be loaded */
638 /* XXX should this be a specific exception? */
639 assert(c->state & CLASS_LOADED);
641 /* This is check in link_class. */
643 assert(!(c->state & CLASS_LINKED));
645 /* cache the self-reference of this class */
646 /* we do this for cases where the defining loader of the class */
647 /* has not yet been recorded as an initiating loader for the class */
648 /* this is needed so subsequent code can assume that self-refs */
649 /* will always resolve lazily */
650 /* No need to do it for the bootloader - it is always registered */
651 /* as initiating loader for the classes it loads. */
653 classcache_store(c->classloader,c,false);
655 /* this class is currently linking */
657 c->state |= CLASS_LINKING;
662 /* Link the super interfaces. */
664 for (i = 0; i < c->interfacescount; i++) {
665 tc = c->interfaces[i];
667 if (!(tc->state & CLASS_LINKED))
672 /* check super class */
676 /* Check for java/lang/Object. */
678 if (c->super == NULL) {
680 c->instancesize = sizeof(java_object_t);
682 vftbllength = supervftbllength = 0;
687 /* Get super class. */
691 /* Link the super class if necessary. */
693 if (!(super->state & CLASS_LINKED))
694 if (!link_class(super))
697 /* OR the ACC_CLASS_HAS_POINTERS and the ACC_CLASS_REFERENCE_*
700 c->flags |= (super->flags &
701 (ACC_CLASS_HAS_POINTERS | ACC_CLASS_REFERENCE_MASK));
703 /* handle array classes */
705 if (c->name->text[0] == '[')
706 if (!(arraydesc = link_array(c)))
709 if (c->flags & ACC_INTERFACE)
710 c->index = interfaceindex++;
712 c->index = super->index + 1;
714 c->instancesize = super->instancesize;
716 vftbllength = supervftbllength = super->vftbl->vftbllength;
718 c->finalizer = super->finalizer;
720 RT_TIMING_GET_TIME(time_resolving);
723 /* compute vftbl length */
725 for (i = 0; i < c->methodscount; i++) {
726 methodinfo *m = &(c->methods[i]);
728 if (!(m->flags & ACC_STATIC)) { /* is instance method */
734 for (j = 0; j < tc->methodscount; j++) {
735 if (method_canoverwrite(m, &(tc->methods[j]))) {
736 if (tc->methods[j].flags & ACC_PRIVATE)
737 goto notfoundvftblindex;
739 /* package-private methods in other packages */
740 /* must not be overridden */
741 /* (see Java Language Specification 8.4.8.1) */
742 if ( !(tc->methods[j].flags & (ACC_PUBLIC | ACC_PROTECTED))
743 && !SAME_PACKAGE(c,tc) )
745 goto notfoundvftblindex;
748 if (!linker_overwrite_method(&(tc->methods[j]), m, &worklist))
751 goto foundvftblindex;
759 m->vftblindex = (vftbllength++);
764 RT_TIMING_GET_TIME(time_compute_vftbl);
767 /* Check all interfaces of an abstract class (maybe be an
768 interface too) for unimplemented methods. Such methods are
769 called miranda-methods and are marked with the ACC_MIRANDA
770 flag. VMClass.getDeclaredMethods does not return such
773 if (c->flags & ACC_ABSTRACT) {
776 s4 abstractmethodscount;
780 abstractmethodscount = 0;
782 /* check all interfaces of the abstract class */
784 for (i = 0; i < c->interfacescount; i++) {
785 ic = c->interfaces[i];
787 for (j = 0; j < ic->methodscount; j++) {
788 im = &(ic->methods[j]);
790 /* skip `<clinit>' and `<init>' */
792 if ((im->name == utf_clinit) || (im->name == utf_init))
795 for (tc = c; tc != NULL; tc = tc->super) {
796 for (k = 0; k < tc->methodscount; k++) {
797 if (method_canoverwrite(im, &(tc->methods[k])))
798 goto noabstractmethod;
802 abstractmethodscount++;
809 if (abstractmethodscount > 0) {
812 /* reallocate methods memory */
814 c->methods = (methodinfo*) MREALLOC(c->methods, methodinfo, c->methodscount,
815 c->methodscount + abstractmethodscount);
817 for (i = 0; i < c->interfacescount; i++) {
818 ic = c->interfaces[i];
820 for (j = 0; j < ic->methodscount; j++) {
821 im = &(ic->methods[j]);
823 /* skip `<clinit>' and `<init>' */
825 if ((im->name == utf_clinit) || (im->name == utf_init))
828 for (tc = c; tc != NULL; tc = tc->super) {
829 for (k = 0; k < tc->methodscount; k++) {
830 if (method_canoverwrite(im, &(tc->methods[k])))
831 goto noabstractmethod2;
835 /* Copy the method found into the new c->methods
836 array and tag it as miranda-method. */
838 am = &(c->methods[c->methodscount]);
841 MCOPY(am, im, methodinfo, 1);
843 am->vftblindex = (vftbllength++);
845 am->flags |= ACC_MIRANDA;
853 RT_TIMING_GET_TIME(time_abstract);
856 #if defined(ENABLE_STATISTICS)
859 sizeof(vftbl_t) + (sizeof(methodptr) * (vftbllength - 1));
862 /* compute interfacetable length */
864 interfacetablelength = 0;
866 for (tc = c; tc != NULL; tc = tc->super) {
867 for (i = 0; i < tc->interfacescount; i++) {
868 s4 h = class_highestinterface(tc->interfaces[i]) + 1;
870 if (h > interfacetablelength)
871 interfacetablelength = h;
874 RT_TIMING_GET_TIME(time_compute_iftbl);
876 /* allocate virtual function table */
878 v = (vftbl_t *) mem_alloc(sizeof(vftbl_t) +
879 sizeof(methodptr) * (vftbllength - 1) +
880 sizeof(methodptr*) * (interfacetablelength - (interfacetablelength > 0)));
881 v = (vftbl_t *) (((methodptr *) v) +
882 (interfacetablelength - 1) * (interfacetablelength > 1));
886 v->vftbllength = vftbllength;
887 v->interfacetablelength = interfacetablelength;
888 v->arraydesc = arraydesc;
890 /* store interface index in vftbl */
892 if (c->flags & ACC_INTERFACE)
893 v->baseval = -(c->index);
895 /* copy virtual function table of super class */
897 for (i = 0; i < supervftbllength; i++)
898 v->table[i] = super->vftbl->table[i];
900 /* Fill the remaining vftbl slots with the AbstractMethodError
901 stub (all after the super class slots, because they are already
904 for (; i < vftbllength; i++) {
905 #if defined(ENABLE_JIT)
906 # if defined(ENABLE_INTRP)
908 v->table[i] = (methodptr) (ptrint) &intrp_asm_abstractmethoderror;
911 v->table[i] = (methodptr) (ptrint) &asm_abstractmethoderror;
913 v->table[i] = (methodptr) (ptrint) &intrp_asm_abstractmethoderror;
917 /* add method stubs into virtual function table */
919 for (i = 0; i < c->methodscount; i++) {
920 methodinfo *m = &(c->methods[i]);
922 assert(m->stubroutine == NULL);
924 /* Don't create a compiler stub for abstract methods as they
925 throw an AbstractMethodError with the default stub in the
926 vftbl. This entry is simply copied by sub-classes. */
928 if (m->flags & ACC_ABSTRACT)
931 #if defined(ENABLE_JIT)
932 # if defined(ENABLE_INTRP)
934 m->stubroutine = intrp_createcompilerstub(m);
937 m->stubroutine = (u1*) CompilerStub::generate(m);
939 m->stubroutine = intrp_createcompilerstub(m);
942 /* static methods are not in the vftbl */
944 if (m->flags & ACC_STATIC)
947 /* insert the stubroutine into the vftbl */
949 v->table[m->vftblindex] = (methodptr) (ptrint) m->stubroutine;
951 RT_TIMING_GET_TIME(time_fill_vftbl);
953 /* compute instance size and offset of each field */
955 for (i = 0; i < c->fieldscount; i++) {
957 fieldinfo *f = &(c->fields[i]);
959 if (!(f->flags & ACC_STATIC)) {
960 dsize = descriptor_typesize(f->parseddesc);
961 c->instancesize = MEMORY_ALIGN(c->instancesize, dsize);
962 f->offset = c->instancesize;
963 c->instancesize += dsize;
966 RT_TIMING_GET_TIME(time_offsets);
968 /* initialize interfacetable and interfacevftbllength */
970 v->interfacevftbllength = MNEW(s4, interfacetablelength);
972 #if defined(ENABLE_STATISTICS)
974 count_vftbl_len += (4 + sizeof(s4)) * v->interfacetablelength;
977 for (i = 0; i < interfacetablelength; i++) {
978 v->interfacevftbllength[i] = 0;
979 v->interfacetable[-i] = NULL;
984 for (tc = c; tc != NULL; tc = tc->super)
985 for (i = 0; i < tc->interfacescount; i++)
986 if (!linker_addinterface(c, tc->interfaces[i]))
989 RT_TIMING_GET_TIME(time_fill_iftbl);
991 /* add finalizer method (not for java.lang.Object) */
996 fi = class_findmethod(c, utf_finalize, utf_void__void);
999 if (!(fi->flags & ACC_STATIC))
1002 RT_TIMING_GET_TIME(time_finalizer);
1006 linker_compute_subclasses(c);
1008 /* FIXME: this is completely useless now */
1009 RT_TIMING_GET_TIME(time_subclasses);
1011 #if USES_NEW_SUBTYPE
1012 if (!build_display(c))
1016 /* revert the linking state and class is linked */
1018 c->state = (c->state & ~CLASS_LINKING) | CLASS_LINKED;
1020 /* check worklist */
1022 /* XXX must this also be done in case of exception? */
1024 while (worklist != NULL) {
1025 method_worklist *wi = worklist;
1027 worklist = worklist->next;
1029 INLINELOG( printf("MUST BE RECOMPILED: "); method_println(wi->m); );
1030 jit_invalidate_code(wi->m);
1032 /* XXX put worklist into dump memory? */
1033 FREE(wi, method_worklist);
1036 RT_TIMING_TIME_DIFF(time_start ,time_resolving ,RT_TIMING_LINK_RESOLVE);
1037 RT_TIMING_TIME_DIFF(time_resolving ,time_compute_vftbl,RT_TIMING_LINK_C_VFTBL);
1038 RT_TIMING_TIME_DIFF(time_compute_vftbl,time_abstract ,RT_TIMING_LINK_ABSTRACT);
1039 RT_TIMING_TIME_DIFF(time_abstract ,time_compute_iftbl,RT_TIMING_LINK_C_IFTBL);
1040 RT_TIMING_TIME_DIFF(time_compute_iftbl,time_fill_vftbl ,RT_TIMING_LINK_F_VFTBL);
1041 RT_TIMING_TIME_DIFF(time_fill_vftbl ,time_offsets ,RT_TIMING_LINK_OFFSETS);
1042 RT_TIMING_TIME_DIFF(time_offsets ,time_fill_iftbl ,RT_TIMING_LINK_F_IFTBL);
1043 RT_TIMING_TIME_DIFF(time_fill_iftbl ,time_finalizer ,RT_TIMING_LINK_FINALIZER);
1044 RT_TIMING_TIME_DIFF(time_finalizer ,time_subclasses ,RT_TIMING_LINK_SUBCLASS);
1046 /* just return c to show that we didn't had a problem */
1052 /* link_array ******************************************************************
1054 This function is called by link_class to create the arraydescriptor
1057 This function returns NULL if the array cannot be linked because
1058 the component type has not been linked yet.
1060 *******************************************************************************/
1062 static arraydescriptor *link_array(classinfo *c)
1066 arraydescriptor *desc;
1071 namelen = c->name->blength;
1073 /* Check the component type */
1075 switch (c->name->text[1]) {
1077 /* c is an array of arrays. */
1078 u = utf_new(c->name->text + 1, namelen - 1);
1079 if (!(comp = load_class_from_classloader(u, c->classloader)))
1084 /* c is an array of objects. */
1085 u = utf_new(c->name->text + 2, namelen - 3);
1086 if (!(comp = load_class_from_classloader(u, c->classloader)))
1091 /* If the component type has not been linked, link it now */
1093 assert(!comp || (comp->state & CLASS_LOADED));
1095 if (comp && !(comp->state & CLASS_LINKED))
1096 if (!link_class(comp))
1099 /* Allocate the arraydescriptor */
1101 desc = NEW(arraydescriptor);
1104 /* c is an array of references */
1105 desc->arraytype = ARRAYTYPE_OBJECT;
1106 desc->componentsize = sizeof(void*);
1107 desc->dataoffset = OFFSET(java_objectarray_t, data);
1109 compvftbl = comp->vftbl;
1112 log_text("Component class has no vftbl");
1116 desc->componentvftbl = compvftbl;
1118 if (compvftbl->arraydesc) {
1119 desc->elementvftbl = compvftbl->arraydesc->elementvftbl;
1121 if (compvftbl->arraydesc->dimension >= 255) {
1122 exceptions_throw_illegalargumentexception();
1126 desc->dimension = compvftbl->arraydesc->dimension + 1;
1127 desc->elementtype = compvftbl->arraydesc->elementtype;
1130 desc->elementvftbl = compvftbl;
1131 desc->dimension = 1;
1132 desc->elementtype = ARRAYTYPE_OBJECT;
1136 /* c is an array of a primitive type */
1137 switch (c->name->text[1]) {
1139 desc->arraytype = ARRAYTYPE_BOOLEAN;
1140 desc->dataoffset = OFFSET(java_booleanarray_t,data);
1141 desc->componentsize = sizeof(u1);
1145 desc->arraytype = ARRAYTYPE_BYTE;
1146 desc->dataoffset = OFFSET(java_bytearray_t,data);
1147 desc->componentsize = sizeof(u1);
1151 desc->arraytype = ARRAYTYPE_CHAR;
1152 desc->dataoffset = OFFSET(java_chararray_t,data);
1153 desc->componentsize = sizeof(u2);
1157 desc->arraytype = ARRAYTYPE_DOUBLE;
1158 desc->dataoffset = OFFSET(java_doublearray_t,data);
1159 desc->componentsize = sizeof(double);
1163 desc->arraytype = ARRAYTYPE_FLOAT;
1164 desc->dataoffset = OFFSET(java_floatarray_t,data);
1165 desc->componentsize = sizeof(float);
1169 desc->arraytype = ARRAYTYPE_INT;
1170 desc->dataoffset = OFFSET(java_intarray_t,data);
1171 desc->componentsize = sizeof(s4);
1175 desc->arraytype = ARRAYTYPE_LONG;
1176 desc->dataoffset = OFFSET(java_longarray_t,data);
1177 desc->componentsize = sizeof(s8);
1181 desc->arraytype = ARRAYTYPE_SHORT;
1182 desc->dataoffset = OFFSET(java_shortarray_t,data);
1183 desc->componentsize = sizeof(s2);
1187 exceptions_throw_noclassdeffounderror(c->name);
1191 desc->componentvftbl = NULL;
1192 desc->elementvftbl = NULL;
1193 desc->dimension = 1;
1194 desc->elementtype = desc->arraytype;
1200 /* linker_create_string_later **************************************************
1202 A hack so we can initialize java.lang.String objects during initialization.
1204 *******************************************************************************/
1205 void linker_create_string_later(java_object_t **a, utf *u)
1207 deferred_strings.push_back(std::make_pair(a, u));
1210 void linker_initialize_deferred_strings()
1212 deferred_strings_vec_t::const_iterator it = deferred_strings.begin();
1213 for (; it != deferred_strings.end(); ++it)
1214 *it->first = literalstring_new(it->second);
1215 deferred_strings.clear();
1219 /* linker_compute_subclasses ***************************************************
1223 ATTENTION: DO NOT REMOVE ANY OF THE LOCKING MECHANISMS BELOW:
1224 This function needs to take the class renumber lock and stop the
1225 world during class renumbering. The lock is used in C code which
1226 is not that performance critical. Whereas JIT code uses critical
1227 sections to atomically access the class values.
1229 *******************************************************************************/
1231 static void linker_compute_subclasses(classinfo *c)
1234 LOCK_CLASSRENUMBER_LOCK;
1236 if (!(c->flags & ACC_INTERFACE)) {
1239 #if USES_NEW_SUBTYPE
1240 c->vftbl->baseval = 1; /* so it does not look like an interface */
1244 if (!(c->flags & ACC_INTERFACE) && (c->super != NULL)) {
1245 c->nextsub = c->super->sub;
1251 #if !USES_NEW_SUBTYPE
1252 /* compute class values */
1254 linker_compute_class_values(class_java_lang_Object);
1257 UNLOCK_CLASSRENUMBER_LOCK;
1262 /* linker_compute_class_values *************************************************
1266 *******************************************************************************/
1268 static void linker_compute_class_values(classinfo *c)
1272 c->vftbl->baseval = ++classvalue;
1277 linker_compute_class_values(subs);
1279 subs = subs->nextsub;
1282 c->vftbl->diffval = classvalue - c->vftbl->baseval;
1286 /* linker_addinterface *********************************************************
1288 Is needed by link_class for adding a VTBL to a class. All
1289 interfaces implemented by ic are added as well.
1292 true.........everything ok
1293 false........an exception has been thrown
1295 *******************************************************************************/
1297 static bool linker_addinterface(classinfo *c, classinfo *ic)
1308 if (i >= v->interfacetablelength)
1309 vm_abort("Internal error: interfacetable overflow");
1311 /* if this interface has already been added, return immediately */
1313 if (v->interfacetable[-i] != NULL)
1316 if (ic->methodscount == 0) { /* fake entry needed for subtype test */
1317 v->interfacevftbllength[i] = 1;
1318 v->interfacetable[-i] = MNEW(methodptr, 1);
1319 v->interfacetable[-i][0] = NULL;
1322 v->interfacevftbllength[i] = ic->methodscount;
1323 v->interfacetable[-i] = MNEW(methodptr, ic->methodscount);
1325 #if defined(ENABLE_STATISTICS)
1327 count_vftbl_len += sizeof(methodptr) *
1328 (ic->methodscount + (ic->methodscount == 0));
1331 for (j = 0; j < ic->methodscount; j++) {
1332 for (sc = c; sc != NULL; sc = sc->super) {
1333 for (k = 0; k < sc->methodscount; k++) {
1334 m = &(sc->methods[k]);
1336 if (method_canoverwrite(m, &(ic->methods[j]))) {
1337 /* method m overwrites the (abstract) method */
1338 #if defined(ENABLE_VERIFIER)
1339 /* Add loading constraints (for the more
1340 general types of the method
1342 if (!classcache_add_constraints_for_params(
1343 c->classloader, ic->classloader,
1350 /* XXX taken from gcj */
1351 /* check for ACC_STATIC: IncompatibleClassChangeError */
1353 /* check for !ACC_PUBLIC: IllegalAccessError */
1355 /* check for ACC_ABSTRACT: AbstracMethodError,
1356 not sure about that one */
1358 v->interfacetable[-i][j] = v->table[m->vftblindex];
1364 /* If no method was found, insert the AbstractMethodError
1367 #if defined(ENABLE_JIT)
1368 # if defined(ENABLE_INTRP)
1370 v->interfacetable[-i][j] =
1371 (methodptr) (ptrint) &intrp_asm_abstractmethoderror;
1374 v->interfacetable[-i][j] =
1375 (methodptr) (ptrint) &asm_abstractmethoderror;
1377 v->interfacetable[-i][j] =
1378 (methodptr) (ptrint) &intrp_asm_abstractmethoderror;
1386 /* add superinterfaces of this interface */
1388 for (j = 0; j < ic->interfacescount; j++)
1389 if (!linker_addinterface(c, ic->interfaces[j]))
1398 /* class_highestinterface ******************************************************
1400 Used by the function link_class to determine the amount of memory
1401 needed for the interface table.
1403 *******************************************************************************/
1405 static s4 class_highestinterface(classinfo *c)
1411 /* check for ACC_INTERFACE bit already done in link_class_intern */
1415 for (i = 0; i < c->interfacescount; i++) {
1416 h2 = class_highestinterface(c->interfaces[i]);
1425 #if defined(__cplusplus)
1430 * These are local overrides for various environment variables in Emacs.
1431 * Please do not remove this and leave it at the end of the file, where
1432 * Emacs will automagically detect them.
1433 * ---------------------------------------------------------------------
1436 * indent-tabs-mode: t
1440 * vim:noexpandtab:sw=4:ts=4: