Context Navigation

source: trunk/nom/src/nombuildclass.c@ 199

Last change on this file since 199 was 199, checked in by cinc, 19 years ago
Fixes for explicit metaclass handling
File size: 57.8 KB

Line
1	/* *** BEGIN LICENSE BLOCK ***
2	* Version: CDDL 1.0/LGPL 2.1
3	*
4	* The contents of this file are subject to the COMMON DEVELOPMENT AND
5	* DISTRIBUTION LICENSE (CDDL) Version 1.0 (the "License"); you may not use
6	* this file except in compliance with the License. You may obtain a copy of
7	* the License at http://www.sun.com/cddl/
8	*
9	* Software distributed under the License is distributed on an "AS IS" basis,
10	* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11	* for the specific language governing rights and limitations under the
12	* License.
13	*
14	* The Original Code is "NOM" Netlabs Object Model
15	*
16	* The Initial Developer of the Original Code is
17	* netlabs.org: Chris Wohlgemuth <cinc-ml@netlabs.org>.
18	* Portions created by the Initial Developer are Copyright (C) 2005-2006
19	* the Initial Developer. All Rights Reserved.
20	*
21	* Contributor(s):
22	*
23	* Alternatively, the contents of this file may be used under the terms of
24	* the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
25	* case the provisions of the LGPL are applicable instead of those above. If
26	* you wish to allow use of your version of this file only under the terms of
27	* the LGPL, and not to allow others to use your version of this file under
28	* the terms of the CDDL, indicate your decision by deleting the provisions
29	* above and replace them with the notice and other provisions required by the
30	* LGPL. If you do not delete the provisions above, a recipient may use your
31	* version of this file under the terms of any one of the CDDL or the LGPL.
32	*
33	* *** END LICENSE BLOCK *** */
34
35	#define INCL_DOS
36	#define INCL_DOSERRORS
37
38	#include <os2.h>
39	#include <stdarg.h>
40	#include <stdio.h>
41	#include <string.h>
42	#include <alloca.h>
43	#include <glib.h>
44	#define SOM_NO_OBJECTS /* Otherwise som.h includes the IBM SOM classes */
45
46	/* For somToken etc. */
47	#include <nom.h>
48	#include <nomtk.h>
49	#include <nomobj.h>
50	#include <nomcls.h>
51	#include <nomclassmanager.h>
52
53	/* Define if you want to have messages from nomBuildClass() and friends */
54	//#define DEBUG_NOMBUILDCLASS
55	/* Define if you want to have messages from building NOMObject */
56	//#define DEBUG_BUILDNOMOBJECT
57	/* Define if you want to have messages from building NOMClass */
58	//#define DEBUG_BUILDNOMCLASS
59
60	#ifdef DEBUG_BUILDNOMCLASS
61	#define BUILDNOMCLASS_ENTER nomPrintf("\n%s line %d: *** entering %s...\n",__FILE__, __LINE__, __FUNCTION__);
62	#define BUILDNOMCLASS_LEAVE nomPrintf("%s line %d: *** Leaving %s...\n\n",__FILE__, __LINE__, __FUNCTION__);
63	#else
64	#define BUILDNOMCLASS_ENTER
65	#define BUILDNOMCLASS_LEAVE
66	#endif
67
68	#ifdef DEBUG_NOMBUILDCLASS
69	#define DBG_NOMBUILDCLASS(a, b, ...) if(a) nomPrintf("%d: " b , __LINE__, __VA_ARGS__);
70	#else
71	#define DBG_NOMBUILDCLASS(a, b, ...)
72	#endif
73
74	#define DBGBUILDNOMCLASS_ENTER BUILDNOMCLASS_ENTER
75	#define DBGBUILDNOMCLASS_LEAVE BUILDNOMCLASS_LEAVE
76
77	/********************************************************/
78	extern NOMClassMgr* NOMClassMgrObject;
79
80	extern PNOM_ENV pGlobalNomEnv;
81
82	/***************** somBuildClass ********************/
83
84	/*
85	Thunking code to get the instance var address from an object pointer pushed
86	on the stack. The following translates into this assembler code:
87
88	MOV EAX,DWORD PTR [ESP+4] ;Move object ptr into EAX
89	ADD EAX, +4
90	RET
91	*/
92
93	static ULONG thunk[]={0x0424448b, 0x00000405, 0x0000c300};
94
95	/*
96	MOV ECX,DWORD PTR [ESP+4] : move object pointer from stack in ECX
97	MOV EDX,DWORD PTR [ECX] : move [ECX] in EDX -> mtab in EDX
98	JMP DWORD PTR [EDX+0ACh] : JMP to address pointing to by EDX+0ACh
99	*/
100	static ULONG mThunkCode[]={0x04244c8b, 0xff00518b, 0x0000aca2 , 0x16000000};
101
102
103	/***********************************************************************************/
104	/***********************************************************************************/
105	/***********************************************************************************/
106	/***********************************************************************************/
107	/*
108	FIXME:
109
110	This is similar to nomIsA() of NOMObject so better use that later.
111
112	*/
113
114	static BOOL priv_nomIsA(NOMObject nomSelf, NOMClass aClassObj)
115	{
116	nomParentMtabStructPtr pParentMtab=&((NOMClassPriv * )nomSelf)->parentMtabStruct;
117	nomMethodTabs psmTab;
118
119	if(!nomSelf\|\|!aClassObj)
120	return FALSE;
121
122	/*
123	FIXME: use nomIsObj here!!
124	if(!nomIsObj(nomSelf)\|\|!nomIsObj(aClassObj))
125	return FALSE
126	*/
127
128	if(!strcmp(nomSelf->mtab->nomClassName, aClassObj->mtab->nomClassName))
129	return TRUE;
130
131	psmTab=pParentMtab->next;
132	while(psmTab) {
133	if(!strcmp(psmTab->mtab->nomClassName, aClassObj->mtab->nomClassName))
134	return TRUE;
135
136	psmTab=psmTab->next;
137	}
138
139	/* Return statement to be customized: */
140	return FALSE;
141	}
142
143	/*
144	Helper function
145	*/
146	static
147	gulong nomGetNumIntroducedMethods(NOMClassPriv* ncPriv)
148	{
149	return ncPriv->sci->ulNumStaticMethods;
150	}
151
152	/*
153	This function should be reworked later to just get the class object from the quark list
154	instead of iterating over all parents.
155	*/
156	static
157	gulong priv_getIndexOfMethodInEntries(NOMClassPriv* nClass, nomStaticClassInfo sci, gchar chrMethodDescriptor)
158	{
159	int a;
160	gulong idx=0;
161	gboolean bFound=FALSE;
162	char* chrMethodName;
163
164	/* We need the full info here, method name and class introducing it */
165	if((chrMethodName=strchr(chrMethodDescriptor, ':'))==NULL)
166	return 0;
167
168	chrMethodName++;
169
170	/* chrMethodName is like "ClassName:MethodName". */
171	for(a=0; a<sci->ulNumParentsInChain; a++)
172	{
173	GString *gstr;
174
175	gstr=g_string_new(sci->chrParentClassNames[a]);
176	g_string_append_printf(gstr, ":%s", chrMethodName);
177
178	// nomPrintf("Checking %s for %s\n",
179	// sci->chrParentClassNames[a], gstr->str);
180	if(g_quark_try_string(gstr->str))
181	{
182	int b;
183	NOMClassPriv *ncPriv;
184	gulong ulNumMethods;
185
186	/* Found class introducing the method */
187	//nomPrintf(" %s, %d: Found %s in %s\n", __FUNCTION__, __LINE__,
188	// gstr->str, sci->chrParentClassNames[a]);
189	if(NULL==NOMClassMgrObject)
190	g_error("%s line %d: No overriding for base classes yet(%s)!\n",
191	__FUNCTION__, __LINE__, gstr->str);
192	idx++; /* This is the position for the class pointer */
193	ncPriv=_nomGetClassInfoPtrFromName(NOMClassMgrObject, sci->chrParentClassNames[a], NULLHANDLE);
194	/* now find the index */
195	ulNumMethods=nomGetNumIntroducedMethods(ncPriv);
196	for(b=0;b<ulNumMethods;b++)
197	{
198	// nomPrintf("%d, checking %s\n", b, *ncPriv->sci->nomSMethods[b].nomMethodId);
199	if(!strcmp(chrMethodName,*ncPriv->sci->nomSMethods[b].nomMethodId ))
200	{
201	// nomPrintf(" %s, %d: Found %s in %s, index: %d\n", __FUNCTION__, __LINE__,
202	// gstr->str, sci->chrParentClassNames[a], b);
203	idx+=b;
204	bFound=TRUE;
205	break;
206	}
207	}/* for(b) */
208	}
209	else
210	{
211	/* Class not yet found... */
212	NOMClassPriv *ncPriv;
213
214	if(NULL==NOMClassMgrObject){
215	/* Things are getting dirty now. Someone tries overriding while we are
216	bootstrapping. That may be either NOMClass or NOMClassMgr. Let's climb
217	the list by hand now... */
218	gulong aLoop, numMethods;
219
220	/* We only support overriding of NOMObject for now when no manager is
221	available. a is the index into the array of class names. a=0 is the
222	first name which is always NOMObject. */
223	if(0!=a)
224	g_error("%s line %d: No Quark. No class manager and attempt to override a class which is not NOMObject\n(method: %s, current class: %s)!\n",
225	__FUNCTION__, __LINE__, gstr->str, sci->chrParentClassNames[a]);
226	ncPriv=pGlobalNomEnv->ncpNOMObject;
227
228	numMethods=nomGetNumIntroducedMethods(ncPriv);
229	for(aLoop=0;aLoop<numMethods;aLoop++)
230	{
231	//nomPrintf("%d, checking %s\n", aLoop, *ncPriv->sci->nomSMethods[aLoop].nomMethodId);
232	if(!strcmp(chrMethodName,*ncPriv->sci->nomSMethods[aLoop].nomMethodId ))
233	{
234	//nomPrintf(" %s, %d: Found %s in %s (hand search), index: %d\n", __FUNCTION__, __LINE__,
235	// gstr->str, sci->chrParentClassNames[a], aLoop);
236	idx=aLoop+1;
237	bFound=TRUE;
238	break;
239	}
240	}/* for(aLoop) */
241	}
242	else{
243	ncPriv=_nomGetClassInfoPtrFromName(NOMClassMgrObject, sci->chrParentClassNames[a], NULLHANDLE);
244	//nomPrintf(" %s did not introduce the method. Adding %d to index\n",
245	// sci->chrParentClassNames[a], nomGetNumIntroducedMethods(ncPriv)+1);
246	idx+=nomGetNumIntroducedMethods(ncPriv)+1; /* classObject pointer */
247	}/* NOMClassMgrObject */
248	}
249	g_string_free(gstr, TRUE);
250	if(bFound)
251	break;
252	}/* for(a) */
253
254	if(bFound)
255	return idx;
256	else
257	return 0;
258	}
259
260	/*
261
262	*/
263	void priv_resolveOverrideMethods(NOMClassPriv nClass, nomStaticClassInfo sci)
264	{
265	if(sci->ulNumStaticOverrides) {
266	int b;
267
268	#ifdef DEBUG_NOMBUILDCLASS
269	nomPrintf(" %d: %d method(s) to override\n", __LINE__, sci->ulNumStaticOverrides);
270	#endif
271
272	/* There're some methods to override */
273	for(b=0;b<sci->ulNumStaticOverrides;b++) {/* For every overriden method do */
274	nomMethodProc** entries;
275	ULONG index;
276
277	entries=&nClass->mtab->entries[0]; /* Adress of array where we enter our resoved method */
278
279	#ifdef DEBUG_NOMBUILDCLASS
280	nomPrintf(" %d: Going to override \"%s\"\n", __LINE__, *sci->nomOverridenMethods[b].nomMethodId);
281	#endif
282
283	index=priv_getIndexOfMethodInEntries(nClass, sci, *sci->nomOverridenMethods[b].nomMethodId);
284	if(0==index){
285	g_warning("%s line %d:\n We are supposed to override \"%s\" but the method can't be found!",
286	__FUNCTION__, __LINE__, *sci->nomOverridenMethods[b].nomMethodId);
287	return;
288	}
289	/* This is the parent method adress which will be used by the overriding class */
290	*sci->nomOverridenMethods[b].nomParentMethod=entries[index];
291	/* Using the found index we insert our new method address into the mtab. */
292	entries[index]=sci->nomOverridenMethods[b].nomMethod;
293	} /* for(b) */
294	}/* if(sci->numStaticOverrides) */
295
296	#ifdef DEBUG_NOMBUILDCLASS
297	else
298	nomPrintf(" No methods to override\n");
299	#endif
300	}
301
302
303	void fillCClassDataStructParentMtab(nomStaticClassInfo sci, NOMClassPriv nClass, NOMClass *nomClass)
304	{
305	/* Insert pointer into CClassDataStructure */
306	sci->ccds->parentMtab=&nClass->parentMtabStruct; /* Insert pointer into CClassDataStructure */
307
308	/* Fill somParentMtabStruct in CClassDataStructure */
309	sci->ccds->parentMtab->mtab=nClass->mtab; /* This class mtab */
310	sci->ccds->parentMtab->next=nClass->mtabList.next;
311	sci->ccds->parentMtab->nomClassObject=nomClass; /* Class object */
312	sci->ccds->parentMtab->ulInstanceSize=nClass->mtab->ulInstanceSize;
313	/* C Class data structure */
314	}
315
316
317	/*
318	- This function builds the nomMethodTab of class nClass.
319	- Calculates the method thunks
320	- Calculates the instance variable thunks using the parent class info
321
322	It takes a parent class ncpParent which may also have introduced instance variables and
323	methods.
324	*/
325	void addMethodAndDataToThisPrivClassStruct(NOMClassPriv* nClass, NOMClassPriv* ncpParent, nomStaticClassInfo *sci)
326	{
327	BYTE * mem;
328	int a;
329
330	BUILDNOMCLASS_ENTER
331
332	nClass->sci=sci; /* Save static class info for internal use */
333
334	/* Copy assembler thunking code for instance data */
335	memcpy(nClass->thunk, thunk, sizeof(thunk));
336	/* Link parent mtab in */
337	nClass->mtabList.next=&ncpParent->mtabList;
338
339	/* Fill all the pointers to the methodtable we need */
340	nClass->mtab=(nomMethodTab)&nClass->thisMtab; / thisMtab is the address where our mtab starts */
341	nClass->mtabList.mtab= (nomMethodTab*)&nClass->thisMtab;
342	nClass->parentMtabStruct.mtab=(nomMethodTab*)&nClass->thisMtab;
343
344	#ifdef DEBUG_NOMBUILDCLASS
345	nomPrintf("nClass->mtabList.next: %x\n", nClass->mtabList.next);
346	#endif
347
348	/* There're some parents. Copy parent mtab data into new mtab. */
349	/* Copy object data. This all goes at the address of "nomMethodProc* entries[0]"
350	entries[] contain copies of the ClassDataStruct and thus the proc addresses of the static methods.
351	*/
352	mem=(char)nClass->mtab; / Target address */
353	memcpy(mem, ncpParent->mtab, ncpParent->mtab->mtabSize); /* copy parent mtab with all proc addresses */
354	#ifdef DEBUG_NOMBUILDCLASS
355	nomPrintf("copy parent data: %d (mtabSize) from %x (mtab of %s, taken from NOMClassPriv) to %x (mtab to build)\n",
356	ncpParent->mtab->mtabSize,
357	sci->nomCds, ncpParent->mtab->nomClassName, mem);
358	#endif
359
360	mem=((char)nClass->mtab) + ncpParent->mtab->mtabSize; / points right after the parent mtab now in
361	our private struct */
362	/* Add class struct of this class. This includes the proc adresses. */
363	if(sci->ulNumStaticMethods) {
364	#ifdef DEBUG_NOMBUILDCLASS
365	nomPrintf("copy own data: %d (classptr+numProcs*procpointersize) from %x (cds, classDataStruct of %x) to %x (our mtab part)\n",
366	sizeof(NOMClass)+sci->ulNumStaticMethodssizeof(nomMethodProc*),
367	sci->nomCds, sci->nomCds->nomClassObject, mem);
368	#endif
369	nClass->entries0=(NOMClass*)mem; / Our part in the mtab starts here. We need this position to insert the class object pointer
370	later. */
371	memcpy( mem, sci->nomCds, sizeof(NOMClass)+sci->ulNumStaticMethodssizeof(nomMethodProc*));
372
373	/* Now finally put the thunking in so the procedures are resolved correctly. */
374	for(a=0;a<sci->ulNumStaticMethods;a++) {
375	ULONG ulOffset;
376
377	memcpy(&nClass->mThunk[a], mThunkCode, sizeof(mThunkCode)); /* Copy thunking code */
378
379	ulOffset=(ULONG)((char)(mem+sizeof(NOMClass))-(char)nClass->mtab); / Skip class object pointer */
380	nClass->mThunk[a].thunk[2]=((ulOffset+asizeof(nomMethodProc))<<8)+0xa2;
381	/* Put thunking code address into CClassStruct */
382	sci->nomCds->nomTokens[a]=(void*)&nClass->mThunk[a];
383	}
384	}
385	/* Thunking code see above. Adjust the offset to the instance data so the right
386	variables are accessed. The offset is different depending on the number of parent
387	classes (which isn't fix) and the number of parent instance vars (which isn't known
388	at compile time) */
389	nClass->thunk[1]=(ncpParent->mtab->ulInstanceSize<<8)+0x05; //0x00000405
390
391	sci->ccds->instanceDataToken=&nClass->thunk;
392
393	BUILDNOMCLASS_LEAVE
394	}
395
396	/*
397	This function is called when asking for information about the parent of a class.
398	It checks if NOMClassMgrObject is already built and if yes asks it for the class.
399	If it's not yet built we are still in the bootstrapping stage and the only parent
400	we may search is NOMObject. Replacing of NOMObject is not supported by NOM.
401	*/
402	static NOMClassPriv* priv_getClassFromName(gchar* chrClassName)
403	{
404	NOMClassPriv *ncpParent=NULL;
405
406	if(NULL==NOMClassMgrObject){
407	/* If we build NOMClass or NOMClassMgr we just use the pointer we saved before. */
408	if(!strcmp(chrClassName, "NOMObject"))
409	ncpParent=pGlobalNomEnv->ncpNOMObject;
410	else
411	g_error("Asking for a parent not being NOMObject while NOMClassMgrObject is NULL. This can't be!!!");
412	}/* NULL== NOMClassMgrObject */
413	else
414	{
415	ncpParent=_nomGetClassInfoPtrFromName(NOMClassMgrObject, chrClassName,
416	NULLHANDLE);
417	}
418
419	return ncpParent;
420	}
421
422	/*
423	This function creates a private class structure for an object from the given sci with
424	correctly resolved methods which holds the mtab. This struct is kept by the metaclass
425	and holds all the information for creating objects.
426
427	nomClass: class object
428	*/
429	static NOMClassPriv * NOMLINK priv_buildPrivClassStruct(long inherit_vars,
430	nomStaticClassInfo *sci,
431	long majorVersion,
432	long minorVersion,
433	NOMClass* nomClass)
434	{
435	ULONG ulParentDataSize=0;
436	ULONG mtabSize;
437	ULONG ulMemSize=0;
438	NOMClassPriv nClass, ncpParent;
439
440	DBGBUILDNOMCLASS_ENTER
441
442	if(!nomClass\|\|!sci)
443	return NULLHANDLE;
444
445	/* The addresse of static methods in sci are already resolved. See nomBuildClass() */
446
447	/* Get parent class if any */
448	if(NULL!=sci->chrParentClassNames){
449	ncpParent=priv_getClassFromName(sci->chrParentClassNames[sci->ulNumParentsInChain]);
450	}/* nomIdAllParents */
451	else
452	ncpParent = NULLHANDLE;
453
454	if(!ncpParent) {
455	g_warning("We are supposed to create a NOMClassPriv but there's no parent!\n");
456	/* FIXME:
457	Maybe we should panic here. */
458	return NULLHANDLE; /* Only SOMObject has no parent, so we have a problem here. */
459	}
460
461	/* Calculate size of new class object */
462	ulMemSize=sizeof(NOMClassPriv)-sizeof(nomMethodTab); /* start size class struct */
463
464	#ifdef DEBUG_NOMBUILDCLASS
465	nomPrintf(" %d: ncpParent->mtab->mtabSize: %d. Parent is: %x (priv) %s\n",
466	__LINE__, ncpParent->mtab->mtabSize, ncpParent, ncpParent->mtab->nomClassName);
467	#endif
468	mtabSize=ncpParent->mtab->mtabSize+sizeof(nomMethodProc)(sci->ulNumStaticMethods)+
469	sizeof(NOMObject);/ numStaticMethods is correct here!
470	NOT numStaticMethods-1!
471	entries[0] in fact contains the
472	class pointer not a method
473	pointer. */
474	ulMemSize+=mtabSize; /* add place for new procs and the new class pointer */
475	ulParentDataSize=ncpParent->mtab->ulInstanceSize; /* Parent instance size */
476	#ifdef DEBUG_NOMBUILDCLASS
477	nomPrintf(" %d: %s: mtabSize will be: %d, ulParentDataSize is: %d\n", __LINE__, __FUNCTION__, mtabSize, ulParentDataSize);
478	#endif
479	/* Alloc private class struct using NOMCalloc. */
480	if((nClass=(NOMClassPriv*)NOMCalloc(1, ulMemSize))==NULLHANDLE)
481	return NULLHANDLE;
482
483	/* Get mem for method thunking code */
484	if(0!=sci->ulNumStaticMethods){
485	nClass->mThunk=NOMMalloc(sizeof(nomMethodThunk)*sci->ulNumStaticMethods);
486	if(!nClass->mThunk) {
487	NOMFree(nClass);
488	return NULLHANDLE;
489	}
490	}
491	/* Add class struct of this class.
492	This includes
493	-resolving the new method adresses
494	-add the parent mtab info to the new built mtab
495	*/
496	addMethodAndDataToThisPrivClassStruct( nClass, ncpParent, sci) ;
497
498	#ifdef DEBUG_NOMBUILDCLASS
499	nomPrintf("%d: %s: mtab: %x\n", __LINE__, __FUNCTION__, nClass->mtab);
500	#endif
501	/*
502	Note: We don't create a class object here so the following isn't done:
503	sci->cds->classObject=nomClass;
504	*/
505
506	/* Resolve ovverrides if any */
507	priv_resolveOverrideMethods(nClass, sci);
508
509	/**********************************/
510	/* Fill methodtable mtab */
511	/**********************************/
512	nClass->mtab->mtabSize=mtabSize;
513	nClass->mtab->nomClassObject=nomClass; /* Class object (metaclass). We build a normal class here. */
514	nClass->mtab->nomClsInfo=(nomClassInfo*)nClass;
515	#warning !!!!! Change this when nomId is a GQuark !!!!!
516	nClass->mtab->nomClassName=*sci->nomClassId;
517	nClass->mtab->ulInstanceSize=sci->ulInstanceDataSize+ulParentDataSize; /* Size of instance data of this class and all
518	parent classes. This isn't actually allocated for this class
519	object but the entry is used when creating the objects. */
520	fillCClassDataStructParentMtab(sci, nClass, nomClass);
521
522	#ifdef DEBUG_NOMBUILDCLASS
523	nomPrintf(" %d: New NOMClassPriv*: %x\n", __LINE__, nClass);
524	#endif
525
526	_nomSetObjectCreateInfo(nomClass, nClass, NULLHANDLE);
527
528	DBGBUILDNOMCLASS_LEAVE
529
530	return nClass;
531	}
532
533
534	NOMClass * NOMLINK priv_buildWithExplicitMetaClass(glong ulReserved,
535	nomStaticClassInfo *sci,
536	gulong majorVersion,
537	gulong minorVersion)
538	{
539	NOMClass nomClass, nomClassMeta;
540
541	if(NULL==NOMClassMgrObject)
542	return NULLHANDLE;
543
544	/* Search for meta class. */
545	#warning !!!!! Change this when nomID is a GQuark !!!!!
546	nomClassMeta=_nomFindClassFromName(NOMClassMgrObject, *sci->nomExplicitMetaId, majorVersion, minorVersion, NULLHANDLE);
547
548	#ifdef DEBUG_NOMBUILDCLASS
549	nomPrintf("%d: %x %s %s\n", __LINE__, nomClassMeta, sci->nomClassId, sci->nomExplicitMetaId);
550	#endif
551
552	if(!nomClassMeta)
553	return NULLHANDLE;
554
555	/* Create a new class object. We create a copy here because we may change the mtab entries
556	through overriding or two classes may use the same meta class but have different
557	sizes, methods etc. I wonder how IBM SOM manages to use the same metaclass
558	for different classes without (apparently) copying it for different uses... */
559	if((nomClass=(NOMClass*)NOMCalloc(1, _nomGetSize(nomClassMeta, NULLHANDLE)))==NULLHANDLE)
560	return NULLHANDLE;
561
562	/* Maybe we should just copy the whole struct here? */
563	nomClass->mtab=nomClassMeta->mtab;
564	#warning !!!!! No call of _nomSetInstanceSize !!!!!
565	#warning !!!!! No call of _nomSetObjectsSCI !!!!!
566	#if 0
567	/* Set object data */
568	_nomSetInstanceSize(nomClass, _nomGetSize(nomClassMeta));
569	/* Save objects sci pointer. We need it when we create instances */
570	_nomSetObjectsSCI(somClass, sci);
571	#endif
572
573	/* Update static class data of class to be build */
574	sci->nomCds->nomClassObject=nomClass;
575
576	/* Now we have a meta class. Create the NOMClassPriv* holding the mtab for the class
577	to be built (which is not a meta class). */
578	priv_buildPrivClassStruct(ulReserved, sci,
579	majorVersion, minorVersion,
580	nomClass);
581
582	#ifdef DEBUG_NOMBUILDCLASS
583	nomPrintf("%d: New class Object (child of NOMClass): %x \n", __LINE__, nomClass);
584	#endif
585
586	/* nomClassReady() is called in nomBuildClass() */
587	return nomClass;
588	}
589
590	/*
591	This function climbs the chain of parents and looks for a parent introducing
592	an explicit metaclass. If found, this metaclass is returned otherwise NOMClass.
593	*/
594	static
595	NOMClass * NOMLINK priv_findExplicitMetaClassFromParents(nomStaticClassInfo *sci)
596	{
597	int a;
598
599	if(1==sci->ulNumParentsInChain)
600	{
601	/* One parent only. That must be NOMObject and NOMObject has NOMClass
602	as metaclass. */
603	return pGlobalNomEnv->defaultMetaClass;;
604	}
605
606	/* Climb the list of parents... */
607
608	/* NOMClassMgrObject==NULL shouldn't ever happen here! */
609	g_assert(NOMClassMgrObject);
610
611	for(a=sci->ulNumParentsInChain-1;a>=0; a--)
612	{
613	NOMObject *nObject;
614	nObject=_nomFindClassFromName(NOMClassMgrObject, sci->chrParentClassNames[a], 0, 0, NULLHANDLE);
615
616	DBG_NOMBUILDCLASS( TRUE , " %s %x %x\n" , sci->chrParentClassNames[a], nObject, NOMClassMgrObject);
617
618	if(nObject){
619	DBG_NOMBUILDCLASS( TRUE , " %s\n" , nObject->mtab->nomClassName);
620	if(strcmp(nObject->mtab->nomClassName, "NOMClass"))
621	return nObject; /* Not NOMClass return */
622	} /* if(nObject) */
623	} /* for() */
624	return pGlobalNomEnv->defaultMetaClass;;;
625	}
626
627	/*
628	This function is called when a class for a given sci should be build with a parent
629	which isn't derived from NOMClass. In that case some NOMClass ccild is the class to
630	be used for the class object. We have to climb the parent list of this object class
631	to check if one parent introduced an explicit metaclass. If yes, we have to use that
632	one as the metaclass. If no parent did that we just use NOMClass.
633	This doesn't mean we reuse the found structs directly. Instead a new copy is created
634	so individula overriding is possible.
635	*/
636	static
637	NOMClass * NOMLINK priv_buildWithNOMClassChildAsMeta(gulong ulReserved,
638	nomStaticClassInfo *sci,
639	long majorVersion,
640	long minorVersion)
641	{
642	NOMClass nomClass, nomClassDefault;
643	NOMClassPriv *nClass;
644
645	#ifdef DEBUG_NOMBUILDCLASS
646	#warning !!!!! Change this when nomId is a GQuark !!!!!
647	nomPrintf("\n\n%d: Entering %s to build %s\n", __LINE__, __FUNCTION__, *sci->nomClassId);
648	#endif
649
650	/* Search parents for a an explicit metaclass. If no explicit metaclass return
651	NOMClass. */
652	nomClassDefault=priv_findExplicitMetaClassFromParents(sci);// this gives a NOMClass* not a NOMClassPriv*
653
654	/** Create the meta class object **/
655	//nomClassDefault=pGlobalNomEnv->defaultMetaClass; // this gives a NOMClass* not a NOMClassPriv*
656
657	if(!nomClassDefault)
658	return NULLHANDLE;
659
660	/* Found NOMClass object */
661
662	//nomPrintf("_nomGetSize(): %d\n", _nomGetSize(nomClassParent, NULLHANDLE));
663
664	/* Create an object */
665	if((nomClass=(NOMClass*)NOMCalloc(1, _nomGetSize(nomClassDefault, NULLHANDLE)))==NULLHANDLE)
666	return NULLHANDLE;
667
668	nomClass->mtab=nomClassDefault->mtab;
669
670	#warning !!!!! _nomSetInstanceSize() not called here !!!!!
671	#warning !!!!! _nomSetObjectsSCI() not called here !!!!!
672	#if 0
673	/* Set object data */
674	_nomSetInstanceSize(somClass, _nomGetSize(nomClassDefault));
675	/* Save objects sci pointer. We need it when we create instances */
676	_nomSetObjectsSCI(nomClass, sci);
677	#endif
678
679	/* Update static class data of the class to be built */
680	sci->nomCds->nomClassObject=nomClass;
681
682	/* Now we have a meta class. Create the NOMClassPriv* holding the mtab for the class
683	to be built. */
684	nClass=priv_buildPrivClassStruct(ulReserved, sci,
685	majorVersion, minorVersion,
686	nomClass);
687
688	#ifdef DEBUG_NOMBUILDCLASS
689	nomPrintf("%s: New class Object (NOMClass): %x NOMClassPriv*: %x\n", __FUNCTION__, nomClass, nomClass->mtab->nomClsInfo);
690	_dumpMtab(nomClass->mtab);
691	_dumpObjShort(nomClass);
692	#endif
693
694	/* nomClassReady() is called in nomBuildClass(), so don't call it here. Same goes for _nomInit(). */
695	return nomClass;
696	}
697
698
699	/*
700	nomClass: NOMClass
701	nClass: NOMClassPriv for NOMClass
702	ulSize: size of a NOMClass object
703
704	This function is used to add a meta class to NOMOBject which was built before.
705	*/
706	NOMClass* createNOMObjectClassObjectAndUpdateNOMObject(NOMClass* nomClass, NOMClassPriv* nClass, gulong ulSize)
707	{
708	NOMClassPriv *ncp;
709	NOMClass *nomObjClass;
710
711	DBGBUILDNOMCLASS_ENTER
712
713	/* The NOMClassPriv for NOMObject */
714	ncp= pGlobalNomEnv->ncpNOMObject;
715
716	/* Allocate a class object for NOMObject for creating NOMObject instances. */
717	if((nomObjClass=(NOMClass*)NOMCalloc(1, ulSize))==NULLHANDLE) {
718	/* We panic here for the simple reason that without a working NOMObject the whole object system
719	will not work. */
720	g_error("No memory for building the class object _NOMObject for NOMObject.");
721	return NULLHANDLE;
722	}
723
724	nomObjClass->mtab=nomClass->mtab; /* Now it's an object */
725
726	_nomSetObjectCreateInfo(nomObjClass, pGlobalNomEnv->ncpNOMObject, NULLHANDLE); /* This NOMClassPriv holds all info to build
727	instances of NOMObject (not that anybody
728	should do that but... */
729	#warning !!!!!!!!!!!!! _somSetObjectsSCI() not called!!!!!!!!!!!!!!!!
730	#warning !!!!!!!!!!!!! _somSetClassData() not called!!!!!!!!!!!!!!!!
731	#if 0
732	_somSetObjectsSCI(nomObjClass, ncp->sci);
733	_somSetClassData(somObjClass, scp->sci->cds);
734	#endif
735
736	/* Update NOMObject data */
737	ncp->mtab->nomClassObject=nomObjClass; /* This is the real NOMClass pointer, not a pointer to NOMClassPriv */
738	ncp->mtab->entries[0]=(void*)nomObjClass;
739
740	/* Put it into the class data of NOMObject */
741	ncp->sci->nomCds->nomClassObject=nomObjClass;
742
743	#ifdef DEBUG_BUILDNOMOBJECT
744	nomPrintf("%d: metaclass for NOMObject created: %x\n",__LINE__, nomObjClass);
745	#endif
746	DBGBUILDNOMCLASS_LEAVE
747	return nomObjClass;
748	}
749
750
751	NOMEXTERN NOMClass * NOMLINK nomBuildClass(gulong ulReserved,
752	nomStaticClassInfo *sci,
753	gulong ulMajorVersion,
754	gulong ulMinorVersion)
755	{
756	NOMClass *nomClass;
757	NOMClassPriv *nClass;
758	NOMClassPriv *ncpParent;
759	ULONG ulParentDataSize=0;
760	ULONG mtabSize;
761	ULONG ulMemSize=0;
762	int a;
763
764	#ifdef DEBUG_NOMBUILDCLASS
765	nomParentMtabStructPtr pParentMtab;
766	nomMethodTabs psmTab;
767	/* Print some info for debbuging */
768	nomPrintf("\n%d: Entering %s to build class %s. ---> NOMClassManagerObject: 0x%x\n",
769	__LINE__, __FUNCTION__, *sci->nomClassId, NOMClassMgrObject);
770	nomPrintf("%d: cds: 0x%x nomClassObject: 0x%x\n", __LINE__, sci->nomCds, sci->nomCds->nomClassObject);
771	#endif
772
773	/* Check if already built */
774	if(sci->nomCds->nomClassObject) {
775	#ifdef DEBUG_NOMBUILDCLASS
776	nomPrintf("%d: Class %s already built. returning 0x%x\n", __LINE__, *sci->nomClassId, sci->nomCds->nomClassObject);
777	#endif
778	return (sci->nomCds)->nomClassObject; /* Yes,return the object */
779	}
780
781	/* Do we want to build again NOMObject the mother of all classes?
782	This happens because every class automatically tries to build the parents
783	(which includes NOMObject somewhere). NOMObject doesn't have a class object
784	yet when created
785	so we have to check here the global pointer to the NOMObject private data.
786	*/
787
788	if(!strcmp(*sci->nomClassId, "NOMObject")){
789	if(pGlobalNomEnv->ncpNOMObject!=NULLHANDLE){
790	#ifdef DEBUG_NOMBUILDCLASS
791	nomPrintf("%d: Class %s already built. returning 0x%x\n", __LINE__, *sci->nomClassId, sci->nomCds->nomClassObject);
792	#endif
793	/* FIXME: this seems to be broken!! */
794	return NULLHANDLE; /* SOMObject already built */
795	}
796	}
797
798	#ifdef _DEBUG_NOMBUILDCLASS
799	nomPrintf("%d: Dumping sci:\n", __LINE__);
800	_dumpSci(sci);
801	#endif
802
803	if(sci->ulNumStaticMethods!=0 && !sci->nomSMethods){
804	nomPrintf(" !!! %s line %d: sci->nomSMethods is NULL for %s !!!\n", __FUNCTION__, __LINE__, *sci->nomClassId);
805	return NULLHANDLE;
806	}
807	/* Fill static classdata with the info from nomStaticMethodDesc array. This means
808	putting the method adresses into the classdata struct.
809	Be aware that the order of the methods in the somStaticMethod_t array is not
810	necessarily in the order as specified in the releaseorder list. But each array member
811	(which is a nomStaticMethodDesc) contains the address of the correct
812	field in the static classdata struct. */
813	/* This also resolves methods for objects not only class objects. Be careful when
814	removing here. You have to correct priv_buildObjecttemplate(). */
815	/* Insert class data structure method tokens */
816	for(a=0;a<sci->ulNumStaticMethods;a++) {
817	sci->nomSMethods[a].nomMAddressInClassData=(void)sci->nomSMethods[a].nomMethod; /* Address to place the resolved function address in see .ih files. /
818	#ifdef _DEBUG_NOMBUILDCLASS
819	nomPrintf(" static method: %s, %lx\n", *sci->nomSMethods[a].chrMethodDescriptor, sci->nomSMethods[a].nomMethod);
820	nomPrintf("%d: %d: method: %x %s (classdata addr. %x) (Fill static class struct with procs)\n",
821	__LINE__, a, sci->nomSMethods[a].nomMethod, *sci->nomSMethods[a].nomMethodId, sci->nomSMethods[a].nomMAddressInClassData);
822	#endif
823	}
824
825	#ifdef _DEBUG_NOMBUILDCLASS
826	nomPrintf("%d: Dumping the filled classdata structure:\n", __LINE__);
827	_dumpClassDataStruct(sci->nomCds, sci->ulNumStaticMethods);
828	#endif
829
830	/* Do we want to build NOMObject the mother of all classes? */
831	if(!strcmp(*sci->nomClassId, "NOMObject")){
832	#ifdef DEBUG_NOMBUILDCLASS
833	nomPrintf("%d: Trying to build %s\n", __LINE__, *sci->nomClassId);
834	#endif
835	priv_buildNOMObjectClassInfo(ulReserved, sci, /* yes */
836	ulMajorVersion, ulMinorVersion);
837	return NULLHANDLE; /* We can't return a SOMClass for SOMObject because SOMClass isn't built yet. */
838	}
839
840	/* Do we want to build NOMClass? */
841	if(!strcmp(*sci->nomClassId, "NOMClass"))
842	return priv_buildNOMClass(ulReserved, sci, /* yes */
843	ulMajorVersion, ulMinorVersion);
844
845	/* Get parent class */
846	if(sci->nomIdAllParents) {
847	#ifdef DEBUG_NOMBUILDCLASS
848	#warning !!!!! Change this when nomId is a GQuark !!!!!
849	nomPrintf("%d: About to search parent %s...\n", __LINE__, **(sci->nomIdAllParents));
850	#endif
851
852	ncpParent=priv_getClassFromName(sci->chrParentClassNames[sci->ulNumParentsInChain]);
853
854	#if 0
855	ncpParent=priv_getClassFromName(**(sci->nomIdAllParents));
856	ncpParent=priv_findPrivClassInGlobalClassListFromName(pGlobalNomEnv,
857	*(sci->nomIdAllParents)); / This may also return a class not derived
858	from SOMClass */
859	#endif
860	if(!ncpParent)
861	return NULLHANDLE; /* Every class except NOMObject must have a parent!! */
862	}/* nomIdAllParents */
863	else
864	return NULLHANDLE; /* Every class except NOMObject must have a parent!! */
865
866	if(!ncpParent)
867	return NULLHANDLE; /* Every class except NOMObject must have a parent!! */
868
869	#ifdef DEBUG_NOMBUILDCLASS
870	/* Do some debugging here... */
871	nomPrintf("%d: Found parent private class info struct. Dumping parentMTabStruct...\n", __LINE__);
872	pParentMtab=&ncpParent->parentMtabStruct;
873	nomPrintf(" parent class: %s (priv %x), pParentMtab: %x, pParentMtab->mtab %x, next: %x\n", ncpParent->mtab->nomClassName,
874	ncpParent, pParentMtab, pParentMtab->mtab, pParentMtab->next);
875	/* climb parent list */
876	psmTab=pParentMtab->next;
877	while(psmTab) {
878	nomPrintf(" next class: %s, next: %x\n", psmTab->mtab->nomClassName, psmTab->next);
879	psmTab=psmTab->next;
880	}
881	#endif /* DEBUG_NOMBUILDCLASS */
882
883
884	/* Check if parent is a class object (derived from NOMClass). */
885	if(!priv_nomIsA((NOMObject*)ncpParent, pGlobalNomEnv->defaultMetaClass)) {
886	/* No, parent of class to build is normal object so we have to use either an explicit meta class if given or
887	another NOMClass derived class for the class object. */
888	#ifdef DEBUG_NOMBUILDCLASS
889	nomPrintf("%d: Class %x (ncpParent->mtab->nomClassName: %s) is not a NOMClass\n",
890	__LINE__, ncpParent, ncpParent->mtab->nomClassName);
891	#endif
892
893	if(sci->nomExplicitMetaId)
894	{
895	/* The explicit metaclass is created at this point. Now it will be filled
896	with the info how to create objects. */
897
898	#ifdef DEBUG_NOMBUILDCLASS
899	nomPrintf("%d: sci->nomExplicitMetaId is set. Calling priv_buildWithExplicitMetaClass().\n", __LINE__);
900	#endif
901
902	nomClass= priv_buildWithExplicitMetaClass(ulReserved, sci,
903	ulMajorVersion, ulMinorVersion);
904	if(nomClass){
905	#ifdef DEBUG_NOMBUILDCLASS
906	nomPrintf("%d: %s: class is 0x%x\n", __LINE__, nomClass->mtab->nomClassName, nomClass);
907	#endif
908	_nomInit(nomClass, NULLHANDLE);
909	_nomClassReady(nomClass, NULLHANDLE);
910	}
911
912	return nomClass;
913	}/* nomExplicitMetaId */
914	else {
915	/* Use NOMClass derived class as meta class. We have to climb the parent list of this object class
916	to check if one parent introduced an explicit metaclass. If yes, we have to use that one as
917	the metaclass. IF no parent did that we just use NOMClass.
918	The following call will create the class object and will also fill in the necessary object info for
919	creating instances. */
920	nomClass= priv_buildWithNOMClassChildAsMeta(ulReserved, sci,
921	ulMajorVersion, ulMinorVersion);
922
923	if(nomClass){
924	//#warning !!!!! No call of _nomClassReady() here !!!!!
925	//#if 0
926	_nomInit(nomClass, NULLHANDLE);
927	_nomClassReady(nomClass, NULLHANDLE);
928	//#endif
929	}
930	return nomClass;
931	}
932	}/* NOMClass derived? */
933
934	/* Child of some NOMClass */
935
936	/** From this point we are building a new class object (derived from NOMClass **/
937	ulMemSize=sizeof(NOMClassPriv)-sizeof(nomMethodTab); /* start size class struct */
938
939	/* Calculate size of new class object */
940	#ifdef DEBUG_NOMBUILDCLASS
941	nomPrintf("%d: Parent class 0x%x (ncpParent->mtab->nomClassName: %s) is a NOMClass (or derived)\n",
942	__LINE__, ncpParent, ncpParent->mtab->nomClassName);
943	nomPrintf(" ncParent->mtab->mtabSize: %d\n", ncpParent->mtab->mtabSize);
944	#endif
945	mtabSize=ncpParent->mtab->mtabSize+sizeof(nomMethodProc)(sci->ulNumStaticMethods)+sizeof(NOMClass);/ ulNumStaticMethods is correct here!
946	NOT numStaticMethods-1!
947	entries[0] in fact contains the
948	class pointer not a method
949	pointer. */
950	ulMemSize+=mtabSize; /* add place for new procs and the new class pointer */
951	ulParentDataSize=ncpParent->mtab->ulInstanceSize; /* Parent instance size */
952
953	#ifdef DEBUG_NOMBUILDCLASS
954	nomPrintf("%d: %s mtabSize is: %d, ulParentDataSize is: %d\n", __LINE__, *sci->nomClassId, mtabSize, ulParentDataSize);
955	#endif
956
957
958	/* Alloc class struct using NOMCalloc. */
959	if((nClass=(NOMClassPriv*)NOMCalloc(1, ulMemSize))==NULLHANDLE)
960	return NULLHANDLE;
961
962	if(0!=sci->ulNumStaticMethods){
963	/* Get mem for method thunking code */
964	nClass->mThunk=NOMMalloc(sizeof(nomMethodThunk)*sci->ulNumStaticMethods);
965	if(!nClass->mThunk) {
966	NOMFree(nClass);
967	return NULLHANDLE;
968	}
969	}
970
971	nClass->ulClassSize=sci->ulInstanceDataSize+ulParentDataSize;
972
973	if((nomClass=(NOMClass*)NOMCalloc(1, sci->ulInstanceDataSize+ulParentDataSize))==NULLHANDLE) {
974	NOMFree(nClass->mThunk);
975	NOMFree(nClass);
976	return NULLHANDLE;
977	}
978
979	nClass->ulPrivClassSize=ulMemSize;
980
981	/* Add class struct of this class. This includes resolving the method adresses. */
982	addMethodAndDataToThisPrivClassStruct( nClass, ncpParent, sci) ;
983
984	/* Resolve overrides if any */
985	priv_resolveOverrideMethods(nClass, sci);
986
987	nomClass->mtab=nClass->mtab;
988	#ifdef DEBUG_NOMBUILDCLASS
989	nomPrintf("%d: mtab: %x, nClass: 0x%x, nomClass: 0x%x\n", __LINE__, nClass->mtab, nClass, nomClass);
990	#endif
991	sci->nomCds->nomClassObject=nomClass; /* Put class pointer in static struct */
992
993	/**********************************/
994	/* Fill methodtable mtab */
995	/**********************************/
996	nClass->mtab->mtabSize=mtabSize;
997	nClass->mtab->nomClassObject=nomClass;
998	nClass->mtab->nomClsInfo=(nomClassInfo*)nClass;
999	nClass->mtab->nomClassName=*sci->nomClassId;
1000	nClass->mtab->ulInstanceSize=sci->ulInstanceDataSize+ulParentDataSize; /* Size of instance data of this class and all
1001	parent classes. This isn't actually allocated for this class
1002	object but the entry is used when creating the objects. */
1003	fillCClassDataStructParentMtab(sci, nClass, nomClass);
1004
1005	/* Thunking see above */
1006	nClass->thunk[1]=(ulParentDataSize<<8)+0x05; //0x00000405
1007	sci->ccds->instanceDataToken=&nClass->thunk;
1008
1009	/* Set this class size into instance var */
1010	#warning !!!!! No call of _nomSetInstanceSize() here !!!!!
1011	// _nomSetInstanceSize(nomClass, sci->ulInstanceDataSize+ulParentDataSize);
1012
1013	#ifdef DEBUG_NOMBUILDCLASS
1014	nomPrintf("%d: New class ptr (class object): %x (NOMClassPriv: %x) for %s\n", __LINE__, nomClass, nClass, *sci->nomClassId);
1015	#endif
1016
1017	//priv_addPrivClassToGlobalClassList(pGlobalNomEnv, nClass);
1018	_nomInit(nomClass, NULLHANDLE);
1019	_nomClassReady(nomClass, NULLHANDLE);
1020	return nomClass;
1021	};
1022
1023
1024	/*********************************************************************************************************************/
1025	/* Unused stuff */
1026	/*********************************************************************************************************************/
1027
1028
1029
1030	#if 0
1031	#include <cwsomcls.h>
1032	#include <somclassmanager.h>
1033	/********************************************************/
1034	/* Toolkit functions, exported */
1035	/********************************************************/
1036
1037	/*
1038	Caller is responsible for freeing the returned somId with SOMFree.
1039	Note: this is not the internal id (hash) of a string!
1040
1041	FIXME:
1042	This function must be checked if it's correct.
1043	*/
1044
1045	somId SOMLINK somIdFromString (string aString)
1046	{
1047	/* This call automatically registers the ID with the runtime */
1048	somIdItem *sid;
1049	somId sID;
1050
1051	if(!aString)
1052	return NULL;
1053
1054	/* Do we already have an ID at all? */
1055	sid=priv_findSomIdInList(pGlobalSomEnv, aString);
1056
1057	if(sid) {
1058	sID=SOMMalloc(sizeof(void*));
1059	if(!sID)
1060	return NULLHANDLE;
1061
1062	sID=(char)sid;
1063	return sID;
1064	}
1065
1066	/* No somId registered yet, so create one */
1067	if((sid=(somIdItem*)SOMCalloc(1, sizeof(somIdItem)))==NULLHANDLE)
1068	return NULLHANDLE;
1069
1070	sid->idString=SOMMalloc(strlen(aString)+1);
1071	if(!sid->idString)
1072	{
1073	SOMFree(sid);
1074	return NULLHANDLE;
1075	}
1076
1077	sid->id=calculateNameHash(aString);
1078
1079	strcpy(sid->idString, aString);
1080	if(!priv_addSomIdToIdList(pGlobalSomEnv, sid)) {
1081	SOMFree(sid->idString);
1082	SOMFree(sid);
1083	return NULLHANDLE;
1084	}
1085
1086	sID=SOMMalloc(sizeof(void*));
1087	if(!sID)
1088	return NULLHANDLE;
1089
1090	sID=(char)sid;
1091	return sID;
1092	}
1093
1094	/*
1095	FIXME: semaphores!!!!!
1096	*/
1097	/*
1098	This function tries to find the class introducing the method 'sid' at first.
1099	*/
1100	static SOMClassPriv* priv_getOverrideClass(somId *sid)
1101	{
1102	char* chrPtr;
1103	SOMClassPriv *scp;
1104	ULONG ulLen;
1105	char *chrMem;
1106
1107	if(!sid)
1108	return NULLHANDLE;
1109
1110	if((chrPtr=strchr(**sid, ':'))==NULLHANDLE)
1111	return NULLHANDLE;
1112
1113	/* Create local copy */
1114	ulLen=strlen(**sid);
1115	if(ulLen>5000) /* prevent stack overflow in case of error */
1116	return NULLHANDLE;
1117
1118	chrMem=alloca(ulLen);
1119	strcpy(chrMem, **sid);
1120
1121	if((chrPtr=strchr(chrMem, ':'))==NULLHANDLE)
1122	return NULLHANDLE; /* How should that happen, but anyway... */
1123
1124	chrPtr=0; / Now we have separated the class name */
1125	#ifdef DEBUG_SOMBUILDCLASS
1126	somPrintf("%d: %s: searching override for %s\n", __LINE__, __FUNCTION__, chrMem);
1127	#endif
1128	scp=priv_findPrivClassInGlobalClassList(pGlobalSomEnv, chrMem);
1129	#ifdef DEBUG_SOMBUILDCLASS
1130	somPrintf("%d: %s: found %x\n", __LINE__, __FUNCTION__, scp);
1131	#endif
1132	if(!scp)
1133	return NULLHANDLE;
1134	#ifdef DEBUG_SOMBUILDCLASS
1135	somPrintf("%d: %s: found %x (SOMClassPriv) ->%x (SOMClass)\n", __LINE__, __FUNCTION__, scp, scp->mtab->classObject);
1136	#endif
1137	return scp;
1138	}
1139
1140	/*
1141	FIXME: semaphores!!!!!
1142	*/
1143	/*
1144	This function tries to find the class introducing the method 'sid' at first.
1145	It returns a SOMClass not a SOMClassPriv.
1146	*/
1147	static SOMClass* priv_getOverrideSOMClass(somId *sid)
1148	{
1149	char* chrPtr;
1150	SOMClassPriv *scp;
1151	ULONG ulLen;
1152	char *chrMem;
1153
1154	if(!sid)
1155	return NULLHANDLE;
1156
1157	if((chrPtr=strchr(**sid, ':'))==NULLHANDLE)
1158	return NULLHANDLE;
1159
1160	/* Create local copy */
1161	ulLen=strlen(**sid);
1162	if(ulLen>5000) /* prevent stack overflow in case of error */
1163	return NULLHANDLE;
1164
1165	chrMem=alloca(ulLen);
1166	strcpy(chrMem, **sid);
1167
1168	if((chrPtr=strchr(chrMem, ':'))==NULLHANDLE)
1169	return NULLHANDLE; /* How should that happen, but anyway... */
1170
1171	chrPtr=0; / Now we have separated the class name */
1172	#ifdef DEBUG_SOMBUILDCLASS
1173	somPrintf("%d: %s: searching override for %s\n", __LINE__, __FUNCTION__, chrMem);
1174	#endif
1175	scp=priv_findPrivClassInGlobalClassList(pGlobalSomEnv, chrMem);
1176	somPrintf("%d: %s: found %x (SOMClassPriv)\n", __LINE__, __FUNCTION__, scp);
1177	if(!scp)
1178	return NULLHANDLE;
1179	#ifdef DEBUG_SOMBUILDCLASS
1180	somPrintf("%d: %s: found %x (SOMClassPriv) ->%x\n", __LINE__, __FUNCTION__, scp, scp->mtab->classObject);
1181	#endif
1182	return scp->mtab->classObject;
1183	}
1184
1185	/*
1186	This function finds the class which introduced the method (methodId) to be overriden. It gets the index
1187	in the mtab of that class and returns it. Using this index the correct method address is taken
1188	from the mtab of the parent class of the class which wants to override a method (sClass). By using the
1189	parent instead the original class (introducing this method in the beginning) any overriding
1190	done in a class subclassing the introducing class is automatically taken into account.
1191	*/
1192	/*
1193	FIXME: semaphores ????
1194	*/
1195	static ULONG priv_getIndexOfMethodToBeOverriden(somId *methodId )
1196	{
1197	return 0;
1198	}
1199
1200	/*
1201	Class format:
1202
1203	struct _SOMClass {
1204	struct somMethodTabStruct *mtab;
1205	struct somClassInfo;
1206	struct somMethodTabListStruct;
1207	struct somParentMtabStruct; Struct to place parent mtab pointer
1208	ULONG thunk[3]; Assembler thunking code
1209	somMethodTabStruct mtabStruct; See beloe
1210	ClassDataStruct class1;
1211	ClassDataStruct class2;
1212	ClassDataStruct class3;
1213	...
1214	};
1215
1216	-- Object Instance Structure:
1217
1218	struct somMethodTabStruct;
1219	typedef struct SOMAny_struct {
1220	struct somMethodTabStruct *mtab;
1221	integer4 body[1];
1222	} SOMAny;
1223
1224	The following struct was built by CW
1225	struct somClassInfo
1226	{
1227	SOMClass *classObject; <- This is a pointer to the SOMObject class object in SOM.
1228	}
1229
1230	typedef struct somMethodTabStruct {
1231	SOMClass *classObject;
1232	somClassInfo *classInfo;
1233	char *className;
1234	long instanceSize;
1235	long dataAlignment;
1236	long mtabSize;
1237	long protectedDataOffset; / from class's introduced data
1238	somDToken protectedDataToken;
1239	somEmbeddedObjStruct *embeddedObjs;
1240	/ remaining structure is opaque /
1241	somMethodProc* entries[1]; <-- I found that this isn't correct (or I misseed something in the includes). When dumping a mtab
1242	the following has this structure:
1243
1244	SOMClass *classObject; /The first class object (SOMObject)
1245	This is basically a copy -> somMethodProc* firstMethod_1;
1246	of the ClassDataStruct somMethodProc* secondMethod_1;
1247	...
1248	SOMClass *classObject; /The second class object
1249	ClassDataStruct of 2. -> somMethodProc* firstMethod_2;
1250	class somMethodProc* secondMethod_2;
1251
1252	} somMethodTab, *somMethodTabPtr;
1253	*/
1254
1255	/*
1256	Build a "SOMObject class" usable for building other class objects e.g. SOMClass
1257	(base for all class objects). Right after SOMObject is constructed, it will be used only
1258	for holding the created mtab structure which contains all the resolved procedure
1259	pointers. This mtab is referenced by the SOMObject and thus by SOMClass (and all classes
1260	to come).
1261	SOMObject will get a full featured class object later when SOMClass is built.
1262
1263
1264	Is this still correct???:
1265
1266	Within this function a "real" SOMObject will be created which will be used when
1267	creating normal objects derived from SOMObject but not from a class object.
1268	This is necessary because the class structure and the object structure are different
1269	so we need two different templates. The class created by this function is only used
1270	for holding data necessary for building SOMClass. This class pointer will not be used
1271	for anything else.
1272	*/
1273	SOMClass * SOMLINK priv_buildSOMObject(long inherit_vars,
1274	somStaticClassInfo *sci,
1275	long majorVersion,
1276	long minorVersion)
1277	{
1278	BYTE * mem;
1279	SOMClassPriv sClass; / This struct holds our private data. A pointer will be in mtab->classInfo */
1280	SOMClass somClass; / A real SOMClass pointer */
1281	int a;
1282	ULONG mtabSize;
1283	ULONG ulMemSize=0;
1284	ULONG ulParentDataSize=0;
1285
1286	#ifdef DEBUG_BUILDSOMOBJECT
1287	somPrintf("%d: Entering %s to build a temporary SOMObject class object\n", __LINE__, __FUNCTION__);
1288	somPrintf("%d: Entering %s to build the mtab for SOMObjects (pEnv->mtabSOMObject)\n", __LINE__, __FUNCTION__);
1289	_dumpSci(sci);
1290	#endif
1291
1292	/* Note: SOMObject has no parents */
1293	return NULLHANDLE;
1294
1295	/* ulMemsize will be the size of our private class structure SOMClassPriv */
1296	ulMemSize=sizeof(SOMClassPriv)-sizeof(somMethodTab); /* start size class struct without the somMethodTab
1297	holding the method pointers. The size of this
1298	somMethodTab will be added later. */
1299
1300	/* Calculate the size of the method tab to be added to the size of the private class struct */
1301	mtabSize=sizeof(somMethodTab)+sizeof(somMethodProc)(sci->numStaticMethods);/* numStaticMethods is correct here! NOT
1302	numStaticMethods-1! entries[0] in fact
1303	contains the class pointer not a method
1304	pointer. */
1305	ulMemSize+=mtabSize; /* Add size of base mtab struct */
1306
1307	/* Alloc private class struct using SOMCalloc. */
1308	if((sClass=(SOMClassPriv*)SOMCalloc(1, ulMemSize))==NULLHANDLE)
1309	return NULLHANDLE;
1310
1311	/* Get mem for method thunking code. This assembler code is needed so the indirect
1312	jump to the methods from the object pointer which is known does work. For each class
1313	an individual thunking code must be calculated because the number of instance
1314	variables is not defined. */
1315	sClass->mThunk=SOMMalloc(sizeof(cwMethodThunk)*sci->numStaticMethods);
1316	if(!sClass->mThunk) {
1317	SOMFree(sClass);
1318	return NULLHANDLE;
1319	}
1320
1321	/* The size of each instance of this class. A SOM object has a method tab pointer
1322	at the beginning followed by the instance variables. */
1323	sClass->ulClassSize=sci->instanceDataSize+sizeof(somMethodTab*);
1324
1325	sClass->sci=sci; /* Save static class info for internal use */
1326	sClass->ulPrivClassSize=ulMemSize; /* Internal housekeeping. Not needed by SOM methods */
1327	memcpy(sClass->thunk, thunk, sizeof(thunk)); /* Copy assembler thunking code for instance data */
1328
1329	/* Fill all the pointers to methodtable we need in the private structure */
1330	sClass->mtab=(somMethodTab)&sClass->thisMtab; / create the mtab pointer and store it */
1331	sClass->mtabList.mtab= (somMethodTab)&sClass->thisMtab; / thisMtab is the position where the mtab starts */
1332	sClass->parentMtabStruct.mtab=(somMethodTab*)&sClass->thisMtab;
1333
1334	/* And now the real SOMClass struct which will be seen by the user. A SOMClass has a mTab pointer
1335	at the beginning and the instance data following. */
1336	if((somClass=(SOMClass)SOMCalloc(1, sci->instanceDataSize+sizeof(somMethodTab)))==NULLHANDLE) {
1337	SOMFree(sClass->mThunk);
1338	SOMFree(sClass);
1339	return NULLHANDLE;
1340	}
1341	somClass->mtab=sClass->mtab;
1342
1343	#ifdef DEBUG_BUILDSOMOBJECT
1344	somPrintf("mtab: %x sClass: %x, somClass: %x\n", sClass->mtab, sClass, somClass);
1345	#endif
1346
1347	/*
1348	FIXME: this somClass must be deleted after updating with the real metaclass!
1349	*/
1350	/*
1351	We don't have a class object yet...
1352	*/
1353	// sci->cds->classObject=somClass; /* Put class pointer in static struct */
1354
1355	/* Copy class data. This goes at the address of "somMethodProc* entries[0]".
1356	Entries[] contain copies of the ClassDataStruct and thus the proc addresses of the static methods.
1357	We don't use the static classDataStruct directly because subclasses will override the proc addresses. */
1358	mem=(char)&(somClass->mtab->entries[0]); / Target address.entries[0] will contain the class pointer */
1359
1360	/* Add class struct of this class. This includes the proc adresses. */
1361	if(sci->numStaticMethods) {
1362	#ifdef DEBUG_BUILDSOMOBJECT
1363	somPrintf("copy: %d (classptr+numProcs*procpointersize) from %x (cds, classDataStruct) to %x\n",
1364	sizeof(SOMClass)+sci->numStaticMethodssizeof(somMethodProc*),
1365	sci->cds, mem);
1366	#endif
1367	/* Copy classDataStruct with the resolved proc addresses */
1368	memcpy( mem, sci->cds, sizeof(SOMClass)+sci->numStaticMethodssizeof(somMethodProc*));
1369
1370	/* Now finally put the thunking in so the procedures are resolved correctly. */
1371	for(a=0;a<sci->numStaticMethods;a++) {
1372	ULONG ulOffset;
1373
1374	memcpy(&sClass->mThunk[a], mThunkCode, sizeof(mThunkCode)); /* Copy method thunking code template */
1375	ulOffset=(ULONG)((char)(mem+sizeof(SOMClass))-(char)somClass->mtab); / Skip priv class data pointer */
1376	sClass->mThunk[a].thunk[2]=((ulOffset+asizeof(somMethodProc))<<8)+0xa2; /* Calculate offset for assembler code */
1377	#ifdef DEBUG_BUILDSOMOBJECT
1378	somPrintf(" %d: %d : Thunk offset: %d (0x%x) -> address will be: %x\n",
1379	__LINE__, a, ulOffset, ulOffset, mem+ulOffset+asizeof(somMethodProc) );
1380	#endif
1381	/* Put thunking code address into CClassStruct */
1382	sci->cds->tokens[a]=(void*)&sClass->mThunk[a];
1383	} /* for */
1384	} /* if(numStaticMethods) */
1385
1386	/**********************************/
1387	/* Fill methodtable mtab */
1388	/**********************************/
1389	sClass->mtab->mtabSize=mtabSize; /* This mtab is the same as the one used in the real SOMClass */
1390
1391	#if 0
1392	/* We don't have a class object yet. */
1393	sClass->mtab->classObject=somClass; /* This is the real SOMClass pointer, not a pointer to SOMClassPriv */
1394	#endif
1395
1396	sClass->mtab->classInfo=(somClassInfo)sClass; / FIXME: I think I may just use this undocumented field for the private data. */
1397	sClass->mtab->className=*sci->classId;
1398	sClass->mtab->instanceSize=sci->instanceDataSize+sizeof(somMethodTabPtr); /* sizeof(methodTabStruct*) + size of instance data of this class
1399	and all parent classes. This is SOMObject so we have no parents. */
1400	/*
1401	FIXME:
1402	The following is not yet initialized (and the previous may be buggy...) */
1403	// long dataAlignment;
1404	// long protectedDataOffset; /* from class's introduced data */
1405	// somDToken protectedDataToken;
1406	// somEmbeddedObjStruct *embeddedObjs;
1407
1408	sci->ccds->parentMtab=&sClass->parentMtabStruct; /* Insert pointer into CClassDataStructure */
1409
1410	/* Fill somParentMtabStruct in CClassDataStructure */
1411	sci->ccds->parentMtab->mtab=sClass->mtab; /* This class mtab */
1412	sci->ccds->parentMtab->next=NULL; /* We dont have parents because we are SOMObject */
1413	sci->ccds->parentMtab->classObject=somClass; /* SOMClass* Class object, this means ourself */
1414	sci->ccds->parentMtab->instanceSize=sClass->mtab->instanceSize;
1415	/* C Class data structure */
1416
1417	/* Thunking code see above. Adjust the offset to the instance data so the right
1418	variables are accessed. The offset is different depending on the number of parent
1419	classes (which isn't fix) and the number of parent instance vars (which isn't known
1420	at compile time) */
1421	sClass->thunk[1]=(ulParentDataSize<<8)+0x05; //0x00000405
1422	sci->ccds->instanceDataToken=&sClass->thunk;
1423
1424	#ifdef DEBUG_BUILDSOMOBJECT
1425	somPrintf("New class ptr (temp. class object for SOMObject): %x (SOMClassPriv: %x) for %s\n",
1426	somClass, sClass, *sci->classId);
1427
1428	somPrintf("%d: Dumping the filled classdata structure:\n", __LINE__);
1429	_dumpClassDataStruct(sci->cds, sci->numStaticMethods);
1430	#endif
1431	#ifdef DEBUG_OBJECTS
1432	_dumpMTabListPrivClass(sClass);
1433	#endif
1434
1435	/* SOMObject is special because it's root of normal classes and meta classes. Because of this it
1436	isn't insert into the normal private meta class list. We also use this info to check if SOMObject
1437	was already built in other places. */
1438	pGlobalSomEnv->scpSOMObject=sClass;
1439
1440	priv_addPrivClassToGlobalClassList(pGlobalSomEnv, sClass);
1441
1442	#ifdef DEBUG_OBJECTS
1443	_dumpObj(somClass);
1444	#endif
1445
1446	/*
1447	We don't run the somInit() method here because the SOMObject class isn't yet completely built.
1448	First a SOMClass meta class must be created because SOMObject needs a SOMClass as the class object like
1449	any other class. In case some code in somInit() tries to access the class object initialization would
1450	fail. In the function building the root SOMClass a metaclass for SOMObject will be created and attached.
1451
1452	Not running somInit() here shouldn't be a problem because we know what we are doing ;-).
1453	If there will ever be the need for special initialization for this very first SOMObject we think again...
1454
1455	In any case fiddling with somInit() in SOMObject and SOMClass is a dangerous thing because at least one of the
1456	two classes won't be completely built at that point in time (because SOMClass is a subclass of SOMObject
1457	and SOMObject needs a SOMClass as metaclass).
1458
1459	_somInit(somClass);
1460	*/
1461	return somClass;
1462	}
1463	#endif

Note: See TracBrowser for help on using the repository browser.

Download in other formats: