type.icl 104 KB
Newer Older
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
implementation module type


import StdEnv
import syntax, typesupport, check, analtypes, overloading, unitype, refmark, predef, utilities, compare_constructor
import RWSDebug

::	TypeInput =
	{	ti_common_defs	:: {# CommonDefs }
	,	ti_functions	:: {# {# FunType }}
	}

::	TypeState =
	{	ts_fun_env		:: !.{! FunctionType}
	,	ts_var_store	:: !Int
	,	ts_attr_store	:: !Int
	,	ts_var_heap		:: !.VarHeap 
	,	ts_type_heaps	:: !.TypeHeaps
	,	ts_expr_heap	:: !.ExpressionHeap 
	,	ts_td_infos		:: !.TypeDefInfos
	,	ts_error		:: !.ErrorAdmin
	}

::	TypeCoercion =
	{	tc_demanded		:: !AType
	,	tc_offered		:: !AType
	,	tc_position		:: !CoercionPosition
	,	tc_coercible	:: !Bool
	}

::	SharedAttribute = 
Sjaak Smetsers's avatar
Sjaak Smetsers committed
32
	{	sa_attr_nr	:: !Int
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
	,	sa_position	:: !Expression
	}

::	Requirements =
	{	req_overloaded_calls	:: ![ExprInfoPtr]
	,	req_type_coercions		:: ![TypeCoercion]
	,	req_attr_coercions		:: ![AttrCoercion]
	,	req_cons_variables		:: ![[TempVarId]]
	,	req_case_and_let_exprs	:: ![ExprInfoPtr]
	}
	
instance toString BoundVar
where
	toString varid = varid.var_name.id_name
	
class arraySubst type :: !type !u:{!Type} -> (!type, !u:{! Type})

instance arraySubst AType
where
	arraySubst atype=:{at_type} subst
		# (at_type, subst) = arraySubst at_type subst
		= ({ atype & at_type = at_type }, subst)
		
instance arraySubst Type
where
	arraySubst tv=:(TempV tv_number) subst
		#! type = subst.[tv_number]
		= case type of
			TE	-> (tv, subst)
			_	-> arraySubst type subst
	arraySubst (arg_type --> res_type) subst
		# (arg_type, subst) = arraySubst arg_type subst
		  (res_type, subst) = arraySubst res_type subst
		= (arg_type --> res_type, subst)
	arraySubst (TA cons_id cons_args) subst
		# (cons_args, subst) = arraySubst cons_args subst
		= (TA cons_id cons_args, subst) 
	arraySubst (TempCV tv_number :@: types) subst
		#! type = subst.[tv_number]
		= case type of
			TE
				# (types, subst) = arraySubst types subst
				-> (TempCV tv_number :@: types, subst)
			_
				# (type, subst) = arraySubst type subst
				  (types, subst) = arraySubst types subst
				-> (simplify_type_appl type types, subst)
	where
		simplify_type_appl :: !Type ![AType] -> Type
		simplify_type_appl (TA type_cons=:{type_arity} cons_args) type_args
			= TA { type_cons & type_arity = type_arity + length type_args } (cons_args ++ type_args)
		simplify_type_appl (cons_var :@: types) type_args
			= cons_var :@: (types ++ type_args)
		simplify_type_appl (TempV tv_number) type_args
			= TempCV tv_number :@: type_args
		simplify_type_appl (TempQV tv_number) type_args
			= TempQCV tv_number :@: type_args
	arraySubst type subst
		= (type, subst)

instance arraySubst [a] | arraySubst a
where
	arraySubst l subst
		= mapSt arraySubst l subst

instance arraySubst TempSymbolType
where
	arraySubst tst=:{tst_args,tst_result,tst_context} subst
		# (tst_args, subst) = arraySubst tst_args subst
		  (tst_result, subst) = arraySubst tst_result subst
		  (tst_context, subst) = arraySubst tst_context subst
		= ({tst & tst_args = tst_args,tst_result = tst_result,tst_context = tst_context}, subst)

instance arraySubst TypeContext
where
	arraySubst tc=:{tc_types} subst
		# (tc_types, subst) = arraySubst tc_types subst
		= ({ tc & tc_types = tc_types}, subst)

/*
instance arraySubst OverloadedCall
where
	arraySubst oc=:{oc_context} subst
		# (oc_context, subst) = arraySubst oc_context subst
		= ({ oc & oc_context = oc_context },  subst)
*/

instance arraySubst CaseType
where
	arraySubst ct=:{ct_pattern_type,ct_result_type,ct_cons_types} subst
		# (ct_pattern_type, subst) = arraySubst ct_pattern_type subst
		  (ct_result_type, subst) = arraySubst ct_result_type subst
		  (ct_cons_types, subst) = arraySubst ct_cons_types subst
		= ({ ct & ct_pattern_type = ct_pattern_type, ct_result_type = ct_result_type, ct_cons_types = ct_cons_types }, subst)

class contains_var a :: !Int !a -> Bool

instance contains_var [a] | contains_var a
where
	contains_var var_id [elem:list]
		= contains_var var_id elem || contains_var var_id list	
	contains_var var_id []
		= False

instance contains_var AType
where
	contains_var var_id {at_type} = contains_var var_id at_type

instance contains_var Type
where
	contains_var var_id (TempV tv_number) 
		= var_id == tv_number
	contains_var var_id (arg_type --> res_type) 
		= contains_var var_id arg_type || contains_var var_id res_type
	contains_var var_id (TA cons_id cons_args)
		= contains_var var_id cons_args
	contains_var var_id (type :@: types)
		= contains_var var_id type || contains_var var_id types
	contains_var _ _ 
		= False

instance contains_var ConsVariable
where
	contains_var var_id (TempCV tv_number) 
		= var_id == tv_number
	contains_var var_id _
		= False

161
162
cannotUnify t1 t2 position err 
	# err = errorHeading "Type error" err
163
	  format = { form_properties = cNoProperties, form_attr_position = No }
164
165
	= { err & ea_file = err.ea_file <<< " cannot unify " <:: (format, t1) <<< " with " <:: (format, t2)  <<< " near " <<< position <<< '\n' }

Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221

/*
simplifyType ta=:(type :@: type_args)
	# type = simplify_type type
	= case type of
		TA type_cons cons_args
			-> TA { type_cons & type_arity = type_cons.type_arity + length type_args } (cons_args ++ type_args)
	 	_ 	-> ta
simplifyType type
	= type
*/

class unify a :: !a !a !TypeInput !*{! Type} !*TypeHeaps -> (!Bool, !*{! Type}, !*TypeHeaps)

instance unify (a, b) | unify, arraySubst a & unify, arraySubst b
where
	unify (t1x, t1y) (t2x, t2y) modules subst heaps
		# (succ, subst, heaps) =  unify t1y t2y modules subst heaps
		| succ
	      # (t1x, subst) = arraySubst t1x subst
	        (t2x, subst) = arraySubst t2x subst
	      = unify t1x t2x modules subst heaps
	      = (False, subst, heaps)

instance unify [a] | unify, arraySubst a
where
	unify [t1 : ts1] [t2 : ts2] modules subst heaps
		= unify (t1,ts1) (t2,ts2) modules subst heaps
	unify [] [] modules subst heaps
		= (True, subst, heaps)
	unify _ _ modules subst heaps
		= (False, subst, heaps)

instance unify AType
where
	unify t1 t2 modules subst heaps = unifyTypes t1.at_type t1.at_attribute t2.at_type t2.at_attribute modules subst heaps


unifyTypes :: !Type !TypeAttribute !Type !TypeAttribute !TypeInput !*{! Type} !*TypeHeaps -> (!Bool, !*{! Type}, !*TypeHeaps)
unifyTypes (TempV tv_number1) attr1 tv=:(TempV tv_number2) attr2 modules subst heaps
	= unifyTempVarIds tv_number1 tv_number2 subst heaps
unifyTypes tv=:(TempV tv_number) attr1 type attr2 modules subst heaps
	| contains_var tv_number type
		= (False, subst, heaps)
		= (True, { subst & [tv_number] = type}, heaps)
unifyTypes type attr1 tv=:(TempV _) attr2 modules subst heaps
	= unifyTypes tv attr2 type attr1 modules subst heaps
unifyTypes t1=:(TB tb1) attr1 t2=:(TB tb2) attr2 modules subst heaps
	| tb1 == tb2
		= (True, subst, heaps)
		= (False, subst, heaps)
unifyTypes (arg_type1 --> res_type1) attr1 (arg_type2 --> res_type2) attr2 modules subst heaps
	= unify (arg_type1,res_type1) (arg_type2,res_type2) modules subst heaps
unifyTypes t1=:(TA cons_id1 cons_args1) attr1 t2=:(TA cons_id2 cons_args2) attr2 modules subst heaps
	| cons_id1 == cons_id2
		= unify cons_args1 cons_args2 modules subst heaps
222
223
		# (succ1, t1, heaps) = tryToExpand t1 attr1 modules heaps
		  (succ2, t2, heaps) = tryToExpand t2 attr2 modules heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
224
225
226
227
		| succ1 || succ2
			= unifyTypes t1 attr1 t2 attr2 modules subst heaps
			= (False, subst, heaps)
unifyTypes (cons_var :@: types) attr1 type2 attr2 modules subst heaps
228
	# (_, type2, heaps) = tryToExpand type2 attr2 modules heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
229
230
	= unifyTypeApplications cons_var types type2 modules subst heaps
unifyTypes type1 attr1 (cons_var :@: types) attr2 modules subst heaps
231
	# (_, type1, heaps) = tryToExpand type1 attr1 modules heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
232
233
234
235
236
237
238
239
	= unifyTypeApplications cons_var types type1 modules subst heaps
unifyTypes t1=:(TempQV qv_number1) attr1 t2=:(TempQV qv_number2) attr2 modules subst heaps
	= (qv_number1 == qv_number2, subst, heaps)
unifyTypes (TempQV qv_number) attr1 type attr2 modules subst heaps
	= (False, subst, heaps)
unifyTypes type attr1 (TempQV qv_number1) attr2 modules subst heaps
	= (False, subst, heaps)
unifyTypes type1 attr1 type2 attr2 modules subst heaps
240
241
	# (succ1, type1, heaps) = tryToExpand type1 attr1 modules heaps
	  (succ2, type2, heaps) = tryToExpand type2 attr2 modules heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
242
243
244
245
	| succ1 || succ2
		= unifyTypes type1 attr1 type2 attr2 modules subst heaps
		= (False, subst, heaps)

246
tryToExpand type=:(TA {type_index={glob_object,glob_module}} type_args) type_attr {ti_common_defs} type_heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
247
248
249
250
251
252
253
	#! type_def = ti_common_defs.[glob_module].com_type_defs.[glob_object]
	= case type_def.td_rhs of
		SynType {at_type}
			# (res_type, type_heaps) = expandTypeApplication type_def.td_args type_def.td_attribute at_type type_args type_attr type_heaps
			-> (True, res_type, type_heaps)
		_
			-> (False, type, type_heaps)
254
tryToExpand type type_attr modules type_heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
	= (False, type, type_heaps)

unifyConsVariables (TempCV tv_number1) (TempCV tv_number2) subst heaps
	= unifyTempVarIds tv_number1 tv_number2 subst heaps
unifyConsVariables (TempCV tv_number1) (TempQCV tv_number2) subst heaps
	= (True, { subst & [tv_number1] = TempQV tv_number2}, heaps)
unifyConsVariables (TempQCV tv_number1) (TempCV tv_number2) subst heaps
	= (True, { subst & [tv_number2] = TempQV tv_number1}, heaps)
unifyConsVariables (TempQCV tv_number1) (TempQCV tv_number2) subst heaps
	= (tv_number1 == tv_number2, subst, heaps)

unifyTempVarIds tv_number1 tv_number2 subst heaps
	| tv_number1 == tv_number2
		= (True, subst, heaps)
		= (True, { subst & [tv_number1] = TempV tv_number2}, heaps)

constructorVariableToTypeVariable (TempCV temp_var_id)
	= TempV temp_var_id
constructorVariableToTypeVariable (TempQCV temp_var_id)
	= TempQV temp_var_id

unifyTypeApplications cons_var type_args type=:(TA type_cons cons_args) modules subst heaps
	# diff = type_cons.type_arity - length type_args
	| diff >= 0 
		# (succ, subst, heaps) = unify type_args (drop diff cons_args) modules subst heaps
		| succ
			# (rest_args, subst) = arraySubst (take diff cons_args) subst
			= unifyTypes (constructorVariableToTypeVariable cons_var) TA_Multi (TA { type_cons & type_arity = diff } rest_args) TA_Multi modules subst heaps
		    = (False, subst, heaps)
		= (False, subst, heaps)
unifyTypeApplications cons_var1 type_args type=:(cons_var2 :@: types) modules subst heaps
	# arity1 = length type_args
	  arity2 = length types
	  diff = arity1 - arity2
	| diff == 0
		# (succ, subst, heaps) = unifyConsVariables cons_var1 cons_var2 subst heaps
		| succ
		    # (type_args, subst) = arraySubst type_args subst
		      (types, subst) = arraySubst types subst
		    = unify type_args types modules subst heaps
			= (False, subst, heaps)
	| diff < 0
		# diff = 0 - diff
		  (succ, subst, heaps) = unifyTypes (constructorVariableToTypeVariable cons_var1) TA_Multi (cons_var2 :@: take diff types) TA_Multi modules subst heaps
		| succ
		    # (type_args, subst) = arraySubst type_args subst
		      (types, subst) = arraySubst (drop diff types) subst
		    = unify type_args types modules subst heaps
			= (False, subst, heaps)
304
//	| otherwise
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
305
306
307
308
309
310
311
312
313
314
315
		# (succ, subst, heaps) = unifyTypes (cons_var1 :@: take diff type_args) TA_Multi (constructorVariableToTypeVariable cons_var2) TA_Multi modules subst heaps
		| succ
		    # (type_args, subst) = arraySubst (drop diff type_args) subst
		      (types, subst) = arraySubst types subst
		    = unify type_args types modules subst heaps
			= (False, subst, heaps)
unifyTypeApplications cons_var type_args type modules subst heaps
	= (False, subst, heaps)


::	CopyState =
Sjaak Smetsers's avatar
Sjaak Smetsers committed
316
	{	copy_heaps		:: !.TypeHeaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
	}
	
instance fromInt TypeAttribute
where
	fromInt AttrUni		= TA_Unique
	fromInt AttrMulti	= TA_Multi
	fromInt av_number	= TA_TempVar av_number

class freshCopy a :: !a !*CopyState -> (!a, !*CopyState)

instance freshCopy [a] | freshCopy a
where
	freshCopy l ls = mapSt freshCopy l ls

/*
cDoExtendAttrEnv	:== True
cDontExtendAttrEnv	:== False

freshCopies :: !Bool ![a] !{# CommonDefs } !*CopyState -> (![a], !*CopyState) | freshCopy a
freshCopies extend_env [] modules cs
	= ([], [], cs)
freshCopies extend_env [t:ts] modules cs
	# (t, prop, cs) = freshCopy extend_env t modules cs
	  (ts, props, cs) = freshCopies extend_env ts modules cs
	= ([t:ts], [prop:props], cs)
*/

freshCopyOfAttributeVar {av_name,av_info_ptr} attr_var_heap
	# (av_info, attr_var_heap) = readPtr av_info_ptr attr_var_heap
	= case av_info of
		AVI_Attr attr
			-> (attr, attr_var_heap)
		_
			-> abort ("freshCopyOfAttributeVar (type,icl)" ---> av_name)

Sjaak Smetsers's avatar
Sjaak Smetsers committed
352

Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
353
354
freshCopyOfTypeAttribute (TA_Var avar) attr_var_heap
	= freshCopyOfAttributeVar avar attr_var_heap
Sjaak Smetsers's avatar
Sjaak Smetsers committed
355
356
357
358

/* A temporary hack to handle the new Object IO lib */
/* Should be removed !!!!!!!!!! */

Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
359
freshCopyOfTypeAttribute (TA_RootVar avar) attr_var_heap
Sjaak Smetsers's avatar
Sjaak Smetsers committed
360
	= PA_BUG (TA_TempExVar, attr_var_heap) (freshCopyOfAttributeVar avar attr_var_heap)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
361
362
363
364
365
366
367
freshCopyOfTypeAttribute TA_None attr_var_heap
	= (TA_Multi, attr_var_heap)
freshCopyOfTypeAttribute TA_Unique attr_var_heap
	= (TA_Unique, attr_var_heap)
freshCopyOfTypeAttribute attr attr_var_heap
	= (attr, attr_var_heap)

Sjaak Smetsers's avatar
Sjaak Smetsers committed
368

Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
369
370
371
372
cIsExistential 		:== True
cIsNotExistential	:== False

freshCopyOfTypeVariable {tv_name,tv_info_ptr} cs=:{copy_heaps}
373
374
375
	# (TVI_Type fresh_var, th_vars)	= readPtr tv_info_ptr copy_heaps.th_vars
//	= (fresh_var, { cs & copy_heaps.th_vars = th_vars } ) // 2.0
	= (fresh_var, { cs & copy_heaps = { copy_heaps & th_vars = th_vars }})
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
376
377

freshConsVariable {tv_info_ptr} type_var_heap
378
	# (tv_info, type_var_heap) = readPtr tv_info_ptr type_var_heap
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
	= (to_constructor_variable tv_info, type_var_heap)
	where
		to_constructor_variable (TVI_Type (TempV temp_var_id))
			= TempCV temp_var_id
		to_constructor_variable (TVI_Type (TempQV temp_var_id))
			= TempQCV temp_var_id

instance freshCopy AType
where 	
	freshCopy type=:{at_type = CV tv :@: types, at_attribute}  cs=:{copy_heaps}
		# (fresh_cons_var, th_vars)		= freshConsVariable tv copy_heaps.th_vars
		  (fresh_attribute, th_attrs)	= freshCopyOfTypeAttribute at_attribute copy_heaps.th_attrs
		  (types, cs)					= freshCopy types { cs & copy_heaps = { copy_heaps & th_attrs = th_attrs, th_vars = th_vars }}
		= ({type & at_type = fresh_cons_var :@: types, at_attribute = fresh_attribute }, cs)
	freshCopy type=:{at_type, at_attribute} cs=:{copy_heaps}
		# (fresh_attribute, th_attrs)	= freshCopyOfTypeAttribute at_attribute copy_heaps.th_attrs
		  (fresh_type, cs)				= freshCopy at_type { cs & copy_heaps = { copy_heaps & th_attrs = th_attrs }}
		= ({ type & at_type = fresh_type, at_attribute = fresh_attribute }, cs)
		
instance freshCopy Type
where
	freshCopy (TV tv) cs=:{copy_heaps}
		= freshCopyOfTypeVariable tv cs
	freshCopy (TA cons_id=:{type_index={glob_object,glob_module}} cons_args)  cs
		# (cons_args, cs) = freshCopy cons_args cs
		= (TA cons_id cons_args, cs)
	freshCopy (arg_type --> res_type) cs
		# (arg_type, cs) = freshCopy arg_type cs
		  (res_type, cs) = freshCopy res_type cs
		= (arg_type --> res_type, cs)
	freshCopy type cs
		= (type, cs)

freshExistentialVariables type_variables state
	= foldSt fresh_existential_variable type_variables state 
where
	fresh_existential_variable {atv_variable={tv_info_ptr}} (var_heap, var_store)
		= (var_heap <:= (tv_info_ptr, TVI_Type (TempQV var_store)), inc var_store)

freshAlgebraicType :: !(Global Int) ![AlgebraicPattern] !{#CommonDefs} !*TypeState -> (![[AType]],!AType,![AttrCoercion],!*TypeState)
freshAlgebraicType {glob_module, glob_object} patterns common_defs ts=:{ts_var_store,ts_attr_store,ts_type_heaps,ts_td_infos}
	# {td_rhs,td_args,td_attrs,td_name,td_attribute} = common_defs.[glob_module].com_type_defs.[glob_object]
	# (th_vars, ts_var_store)		= fresh_type_variables td_args (ts_type_heaps.th_vars, ts_var_store)
	  (th_attrs, ts_attr_store)		= fresh_attributes td_attrs (ts_type_heaps.th_attrs, ts_attr_store)
Sjaak Smetsers's avatar
Sjaak Smetsers committed
423
424
425
426
	  copy_heaps = { ts_type_heaps & th_vars = th_vars, th_attrs = th_attrs }
	  (cons_types, alg_type, ts_var_store, attr_env, copy_heaps)
	  		= fresh_symbol_types patterns common_defs.[glob_module].com_cons_defs ts_var_store copy_heaps
	= (cons_types, alg_type, attr_env, { ts & ts_var_store = ts_var_store, ts_attr_store = ts_attr_store, ts_type_heaps = copy_heaps })
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
427
428
//		---> ("freshAlgebraicType", alg_type, cons_types)
where
Sjaak Smetsers's avatar
Sjaak Smetsers committed
429
	fresh_symbol_types [{ap_symbol={glob_object}}] cons_defs var_store copy_heaps
430
		# {cons_type = {st_args,st_attr_env,st_result}, cons_index, cons_exi_vars} = cons_defs.[glob_object.ds_index]
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
431
432
		  (th_vars, var_store)		= freshExistentialVariables  cons_exi_vars (copy_heaps.th_vars, var_store)
	  	  (attr_env, th_attrs) 		= fresh_environment st_attr_env ([], copy_heaps.th_attrs)
Sjaak Smetsers's avatar
Sjaak Smetsers committed
433
	  	  (result_type, cs)			= freshCopy st_result { copy_heaps = { copy_heaps & th_attrs = th_attrs, th_vars = th_vars } }
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
434
	  	  (fresh_args, cs)			= freshCopy st_args cs
Sjaak Smetsers's avatar
Sjaak Smetsers committed
435
436
437
438
		= ([fresh_args], result_type, var_store, attr_env, cs.copy_heaps)
	fresh_symbol_types [{ap_symbol={glob_object}} : patterns] cons_defs var_store copy_heaps
		# (cons_types, result_type, var_store, attr_env, copy_heaps)
				= fresh_symbol_types patterns cons_defs var_store copy_heaps
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
439
440
441
		  {cons_type = {st_args,st_attr_env}, cons_index, cons_exi_vars} = cons_defs.[glob_object.ds_index]
		  (th_vars, var_store)		= freshExistentialVariables cons_exi_vars (copy_heaps.th_vars, var_store)
		  (attr_env, th_attrs) 		= fresh_environment st_attr_env (attr_env, copy_heaps.th_attrs)
Sjaak Smetsers's avatar
Sjaak Smetsers committed
442
443
	  	  (fresh_args, cs) 			= freshCopy st_args  { copy_heaps = { copy_heaps & th_attrs = th_attrs, th_vars = th_vars }}
		= ([fresh_args : cons_types], result_type, var_store, attr_env, cs.copy_heaps)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473

	
	fresh_type_variables type_variables state
		= foldSt (\{atv_variable={tv_info_ptr}} (var_heap, var_store) -> (var_heap <:= (tv_info_ptr, TVI_Type (TempV var_store)), inc var_store))
						type_variables state 
	fresh_attributes attributes state
		= foldSt (\{av_info_ptr} (attr_heap, attr_store) -> (attr_heap <:= (av_info_ptr, AVI_Attr (TA_TempVar attr_store)), inc attr_store))
						attributes state
	fresh_environment inequalities (attr_env, attr_heap)
		= foldSt fresh_inequality inequalities (attr_env, attr_heap)

	fresh_inequality {ai_demanded,ai_offered} (attr_env, attr_heap)
		# (AVI_Attr dem_temp_attr, attr_heap) = readPtr ai_demanded.av_info_ptr attr_heap
		  (AVI_Attr off_temp_attr, attr_heap) = readPtr ai_offered.av_info_ptr attr_heap
		= case dem_temp_attr of
			TA_TempVar dem_attr_var
				-> case off_temp_attr of
					TA_TempVar off_attr_var
						| is_new_ineqality  dem_attr_var off_attr_var attr_env
							-> ([{ac_demanded = dem_attr_var, ac_offered = off_attr_var} : attr_env ], attr_heap)
							-> (attr_env, attr_heap)
					_
						-> (attr_env, attr_heap)
			_
				-> (attr_env, attr_heap)
		
	is_new_ineqality dem_attr_var off_attr_var [{ac_demanded, ac_offered} : attr_env]
		= (dem_attr_var <> ac_demanded || off_attr_var <> ac_offered) && is_new_ineqality dem_attr_var off_attr_var  attr_env
	is_new_ineqality dem_attr_var off_attr_var []
		= True
Sjaak Smetsers's avatar
Sjaak Smetsers committed
474
475
476
477
478
479

cWithFreshContextVars 		:== True		
cWithoutFreshContextVars 	:== False		

freshSymbolType fresh_context_vars st=:{st_vars,st_args,st_result,st_context,st_attr_vars,st_attr_env,st_arity} common_defs
				ts=:{ts_var_store,ts_attr_store,ts_type_heaps,ts_td_infos,ts_var_heap}
Sjaak Smetsers's avatar
Sjaak Smetsers committed
480
481
	# (th_vars, ts_var_store)		= fresh_type_variables st_vars (ts_type_heaps.th_vars, ts_var_store)
	  (th_attrs, ts_attr_store)	= fresh_attributes st_attr_vars (ts_type_heaps.th_attrs, ts_attr_store)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
482
483
484
485
	  (attr_env, th_attrs)		= freshEnvironment st_attr_env th_attrs 
	  cs = { copy_heaps = { ts_type_heaps & th_vars = th_vars, th_attrs = th_attrs }}
	  (tst_args, cs)				= freshCopy st_args  cs
	  (tst_result, cs)				= freshCopy st_result cs
Sjaak Smetsers's avatar
Sjaak Smetsers committed
486
	  (tst_context, ({copy_heaps}, ts_var_heap)) 	= freshTypeContexts fresh_context_vars st_context (cs, ts_var_heap)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
487
488
	  cons_variables				= foldSt (collect_cons_variables_in_tc common_defs) tst_context []
	= ({ tst_args = tst_args, tst_result = tst_result, tst_context = tst_context, tst_attr_env = attr_env, tst_arity = st_arity, tst_lifted = 0 }, cons_variables,
Sjaak Smetsers's avatar
Sjaak Smetsers committed
489
490
	   { ts & ts_var_store = ts_var_store, ts_attr_store = ts_attr_store, ts_type_heaps = copy_heaps, ts_var_heap = ts_var_heap})
//		---> ("freshSymbolType", tst_args, tst_result, tst_context)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
	where
		fresh_type_variables type_variables state
			= foldr (\{tv_info_ptr} (var_heap, var_store) -> (writePtr tv_info_ptr (TVI_Type (TempV var_store)) var_heap, inc var_store))
							state type_variables
		fresh_attributes attributes state
			= foldr (\{av_info_ptr} (attr_heap, attr_store) -> (writePtr av_info_ptr (AVI_Attr (TA_TempVar attr_store)) attr_heap, inc attr_store))
							state attributes
		
		collect_cons_variables_in_tc common_defs tc=:{tc_class={glob_module,glob_object={ds_index}}, tc_types} collected_cons_vars
			# {class_cons_vars} = common_defs.[glob_module].com_class_defs.[ds_index]
			= collect_cons_variables tc_types class_cons_vars collected_cons_vars
		
		collect_cons_variables [] class_cons_vars collected_cons_vars
			= collected_cons_vars
		collect_cons_variables [type : tc_types] class_cons_vars collected_cons_vars
			| class_cons_vars bitand 1 == 0
				= collect_cons_variables tc_types (class_cons_vars >> 1) collected_cons_vars
				= case type of
					TempV temp_var_id 
						-> collect_cons_variables tc_types (class_cons_vars >> 1) (add_variable temp_var_id collected_cons_vars)
//							---> ("collect_cons_variables", temp_var_id)
					_
						-> collect_cons_variables tc_types (class_cons_vars >> 1) collected_cons_vars
						
		add_variable new_var_id []
			= [new_var_id]
		add_variable new_var_id vars=:[var_id : var_ids]
			| new_var_id == var_id
				= vars
				= [var_id : add_variable new_var_id var_ids]
521
522
523
	
// JVG: added type:
freshInequality :: AttrInequality *(Heap AttrVarInfo) -> (!AttrCoercion,!.Heap AttrVarInfo);
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
524
525
526
527
528
529
530
531
532
533
534
535
536
537
freshInequality {ai_demanded,ai_offered} attr_heap
	# (av_dem_info, attr_heap) = readPtr ai_demanded.av_info_ptr attr_heap
	  (av_off_info, attr_heap) = readPtr ai_offered.av_info_ptr attr_heap
	  (AVI_Attr (TA_TempVar dem_attr_var)) = av_dem_info
	  (AVI_Attr (TA_TempVar off_attr_var)) = av_off_info
	= ({ac_demanded = dem_attr_var, ac_offered = off_attr_var}, attr_heap) // <<- (av_dem_info,av_off_info)
	
freshEnvironment [ineq : ineqs] attr_heap
	# (fresh_ineq, attr_heap) = freshInequality ineq attr_heap
	  (fresh_env, attr_heap) = freshEnvironment ineqs attr_heap
	= ([fresh_ineq : fresh_env], attr_heap)
freshEnvironment [] attr_heap
	= ([], attr_heap)

Sjaak Smetsers's avatar
Sjaak Smetsers committed
538
539
freshTypeContexts fresh_context_vars tcs cs_and_var_heap
	= mapSt (fresh_type_context fresh_context_vars) tcs cs_and_var_heap
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
540
where	
Sjaak Smetsers's avatar
Sjaak Smetsers committed
541
	fresh_type_context fresh_context_vars tc=:{tc_types} (cs, var_heap)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
542
		# (tc_types, cs) = mapSt fresh_context_type tc_types cs
Sjaak Smetsers's avatar
Sjaak Smetsers committed
543
544
545
546
		| fresh_context_vars
			# (new_info_ptr, var_heap) = newPtr VI_Empty var_heap
			= ({ tc & tc_types = tc_types, tc_var = new_info_ptr }, (cs, var_heap))
			= ({ tc & tc_types = tc_types}, (cs, var_heap))
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578

	fresh_context_type (CV tv :@: types) cs=:{copy_heaps}
		# (fresh_cons_var, th_vars)		= freshConsVariable tv copy_heaps.th_vars
		  (types, cs) = freshCopy types { cs & copy_heaps = { copy_heaps & th_vars = th_vars }}
		= (fresh_cons_var :@: types, cs)
	fresh_context_type type cs
		= freshCopy type cs

freshAttributedVariable :: !u:TypeState -> (!AType, !u:TypeState)
freshAttributedVariable ts=:{ts_var_store,ts_attr_store}
	= ({ at_attribute = TA_TempVar ts_attr_store, at_annotation = AN_None, at_type = TempV ts_var_store },
	     {ts & ts_var_store = inc ts_var_store, ts_attr_store = inc ts_attr_store})

freshNonUniqueVariable :: !u:TypeState -> (!AType, !u:TypeState)
freshNonUniqueVariable ts=:{ts_var_store}
	= ({ at_attribute = TA_Multi, at_annotation = AN_None, at_type = TempV ts_var_store },
	     {ts & ts_var_store = inc ts_var_store})

freshAttribute :: !u:TypeState -> (!TypeAttribute, !u:TypeState)
freshAttribute ts=:{ts_attr_store}
	= (TA_TempVar ts_attr_store, {ts & ts_attr_store = inc ts_attr_store})


::	PropState =
	{	prop_type_heaps	:: !.TypeHeaps
	,	prop_td_infos	:: !.TypeDefInfos
	,	prop_attr_vars	:: ![AttributeVar]
	,	prop_attr_env	:: ![AttrInequality]
	,	prop_error		:: !.ErrorAdmin
	}

attribute_error type_attr err
579
580
	# err = errorHeading "Type error" err
	= { err & ea_file = err.ea_file <<< "* attribute expected instead of " <<< type_attr <<< '\n' }
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722

addPropagationAttributesToAType modules type=:{at_type = TA cons_id=:{type_index={glob_object,glob_module}} cons_args, at_attribute} ps
	# (cons_args, props, ps=:{prop_td_infos,prop_type_heaps,prop_attr_vars,prop_attr_env,prop_error})
			= add_propagation_attributes_to_atypes modules cons_args ps
	  (prop_class, th_vars, prop_td_infos) = propClassification glob_object glob_module props modules prop_type_heaps.th_vars prop_td_infos
	  (at_attribute, prop_class, th_attrs, prop_attr_vars, prop_attr_env, prop_error)
	  		= determine_attribute_of_cons modules at_attribute cons_args prop_class prop_type_heaps.th_attrs prop_attr_vars prop_attr_env prop_error
	= ({ type & at_type = TA cons_id cons_args, at_attribute = at_attribute }, prop_class,  { ps & prop_attr_vars = prop_attr_vars,
			prop_td_infos = prop_td_infos, prop_attr_env = prop_attr_env,
				prop_type_heaps = { prop_type_heaps & th_vars = th_vars, th_attrs = th_attrs}, prop_error = prop_error })
	where
		add_propagation_attributes_to_atypes modules [] ps
			= ([], [], ps) 
		add_propagation_attributes_to_atypes modules [atype : atypes] ps
			# (atype, prop_class, ps) = addPropagationAttributesToAType modules atype ps
			  (atypes, prop_classes, ps) = add_propagation_attributes_to_atypes modules atypes ps
			= ([atype : atypes], [prop_class : prop_classes], ps)
	
		determine_attribute_of_cons modules TA_Unique cons_args prop_class attr_var_heap attr_vars attr_env ps_error
			= (TA_Unique, prop_class >> length cons_args, attr_var_heap, attr_vars, attr_env, ps_error)
		determine_attribute_of_cons modules cons_attr cons_args prop_class attr_var_heap attr_vars attr_env ps_error
			# (cumm_attr, prop_attrs, prop_class) = determine_cummulative_attribute cons_args TA_Multi [] prop_class
			  (comb_attr, attr_var_heap, attr_vars, attr_env, ps_error)
			  		= combine_attributes cons_attr cumm_attr prop_attrs attr_var_heap attr_vars attr_env ps_error
			= (comb_attr, prop_class, attr_var_heap, attr_vars, attr_env, ps_error)
			  
		determine_cummulative_attribute [] cumm_attr attr_vars prop_class
			= (cumm_attr, attr_vars, prop_class)
		determine_cummulative_attribute [{at_attribute} : types ] cumm_attr attr_vars prop_class
			| prop_class bitand 1 == 0
				= determine_cummulative_attribute types cumm_attr attr_vars (prop_class >> 1)
				= case at_attribute of
					TA_Unique
						-> (TA_Unique, [], prop_class >> length types)
					TA_Multi
						-> determine_cummulative_attribute types cumm_attr attr_vars (prop_class >> 1)
					TA_Var attr_var
						-> determine_cummulative_attribute types at_attribute [attr_var : attr_vars] (prop_class >> 1)
		

		combine_attributes (TA_Var attr_var) cumm_attr prop_vars attr_var_heap attr_vars attr_env ps_error
			= case cumm_attr of
				TA_Unique
					-> (TA_Unique, attr_var_heap, attr_vars, attr_env, attribute_error attr_var ps_error)
				
				TA_Multi
					-> (TA_Var attr_var, attr_var_heap, attr_vars, attr_env, ps_error)
				TA_Var _
					-> (TA_Var attr_var, attr_var_heap, attr_vars, foldSt (new_inequality attr_var) prop_vars attr_env, ps_error)
		where
			new_inequality off_attr_var dem_attr_var [] 
				= [{ ai_demanded = dem_attr_var, ai_offered = off_attr_var }]
			new_inequality off_attr_var dem_attr_var ins=:[ inequal : iequals ]
				 | dem_attr_var.av_info_ptr == inequal.ai_demanded.av_info_ptr && off_attr_var.av_info_ptr == inequal.ai_offered.av_info_ptr
				 	= ins
				 	= [ inequal : new_inequality off_attr_var dem_attr_var iequals ]
	
		combine_attributes _ (TA_Var var) prop_vars attr_var_heap attr_vars attr_env ps_error
			# (new_attr_ptr, attr_var_heap) = newPtr AVI_Empty attr_var_heap
			  new_attr_var = { var & av_info_ptr = new_attr_ptr }
			= (TA_Var new_attr_var, attr_var_heap, [new_attr_var : attr_vars],
					mapAppend (\ai_demanded -> { ai_demanded = ai_demanded, ai_offered = new_attr_var }) prop_vars attr_env, ps_error)
		combine_attributes cons_attr TA_Unique _ attr_var_heap attr_vars attr_env ps_error
			= (TA_Unique, attr_var_heap, attr_vars, attr_env, ps_error)
		combine_attributes cons_attr _ _ attr_var_heap attr_vars attr_env ps_error
			= (cons_attr, attr_var_heap, attr_vars, attr_env, ps_error)

addPropagationAttributesToAType modules type=:{at_type} ps
	# (at_type, ps) = addPropagationAttributesToType modules at_type ps
	= ({ type & at_type = at_type }, NoPropClass, ps)

addPropagationAttributesToType modules (arg_type --> res_type) ps
	# (arg_type, prop_class, ps) = addPropagationAttributesToAType modules arg_type ps
	  (res_type, prop_class, ps) = addPropagationAttributesToAType modules res_type ps
	= (arg_type --> res_type, ps)
addPropagationAttributesToType modules (type_var :@: types) ps
	# (types, ps) = addPropagationAttributesToATypes modules types ps
	= (type_var :@: types, ps)
addPropagationAttributesToType modules type ps
	= (type, ps)

addPropagationAttributesToATypes modules types ps
	= mapSt (add_propagation_attributes_to_atype modules) types ps
where
	add_propagation_attributes_to_atype modules type ps
		# (type, prop_class, ps) = addPropagationAttributesToAType modules type ps
		= (type, ps)

:: Base :== {! AType}

currySymbolType st=:{tst_args,tst_arity,tst_result,tst_attr_env} req_arity ts=:{ts_attr_store}
	| tst_arity == req_arity
		= (st, ts)
	# (tst_args, rest_args, is_unique) = split_args req_arity tst_args 
	| is_unique
		# (type, _, _) = buildCurriedType rest_args tst_result TA_Unique [] 0
		= ({ st & tst_args = tst_args, tst_arity = req_arity, tst_result = type }, ts)
		# (type, tst_attr_env, ts_attr_store) = buildCurriedType rest_args tst_result (TA_TempVar ts_attr_store)
		  		(build_attr_env ts_attr_store tst_args tst_attr_env) (inc ts_attr_store)
		= ({ st & tst_args = tst_args, tst_arity = req_arity, tst_result = type, tst_attr_env = tst_attr_env }, { ts & ts_attr_store = ts_attr_store })
where
	split_args 0 args = ([], args, False)
	split_args n [atype=:{at_attribute} : args]
		# (left, right, is_unique) = split_args (dec n) args
		= ([ atype : left ], right, is_unique || attr_is_unique at_attribute)
	
	attr_is_unique TA_Unique = True
	attr_is_unique _ = False
	
	build_attr_env cum_attr_var [] attr_env
		= attr_env
	build_attr_env cum_attr_var [{at_attribute=(TA_TempVar attr_var)} : args] attr_env
		= build_attr_env cum_attr_var args [{ ac_demanded = attr_var, ac_offered = cum_attr_var } : attr_env]
	build_attr_env cum_attr_var [_ : args] attr_env
		= build_attr_env cum_attr_var args attr_env


emptyIdent =: { id_name = "", id_info = nilPtr }

buildCurriedType [] type cum_attr attr_env attr_store
	= (type, attr_env, attr_store)
buildCurriedType [at=:{at_attribute}:ats] type cum_attr attr_env attr_store
	# (next_cum_attr, attr_env, attr_store) = combine_attributes at_attribute cum_attr attr_env attr_store
	  (res_type, attr_env, attr_store) = buildCurriedType ats type next_cum_attr attr_env attr_store
	= ({at_annotation = AN_None, at_attribute = cum_attr , at_type = at --> res_type }, attr_env, attr_store)
where
	combine_attributes TA_Unique cum_attr attr_env attr_store
		= (TA_Unique, attr_env, attr_store)
	combine_attributes (TA_TempVar attr_var) (TA_TempVar cum_attr_var) attr_env attr_store
		= (TA_TempVar attr_store, [{ ac_demanded = cum_attr_var,ac_offered = attr_store },{ ac_demanded = attr_var,ac_offered = attr_store }:attr_env], inc attr_store)
	combine_attributes (TA_TempVar _) cum_attr attr_env attr_store
		= (cum_attr, attr_env, attr_store)
	combine_attributes _ (TA_TempVar cum_attr_var) attr_env attr_store
		= (TA_TempVar attr_store, [{ ac_demanded = cum_attr_var,ac_offered = attr_store }:attr_env], inc attr_store)
	combine_attributes _ cum_attr attr_env attr_store
		= (cum_attr, attr_env, attr_store)

determineSymbolTypeOfFunction ident act_arity st=:{st_args,st_result,st_attr_vars,st_attr_env} type_ptr common_defs ts=:{ts_var_heap}
	# (type_info, ts_var_heap) = readPtr type_ptr ts_var_heap
	  ts = { ts & ts_var_heap = ts_var_heap }
	= case type_info of
		VI_PropagationType symb_type
Sjaak Smetsers's avatar
Sjaak Smetsers committed
723
	   		# (copy_symb_type, cons_variables, ts) = freshSymbolType cWithFreshContextVars symb_type common_defs ts 
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
724
725
726
727
728
729
730
731
732
			  (curried_st, ts) = currySymbolType copy_symb_type act_arity ts
			-> (curried_st, cons_variables, ts)
		_	
			# (st_args, ps) = addPropagationAttributesToATypes common_defs st_args
					{ prop_type_heaps = ts.ts_type_heaps, prop_td_infos = ts.ts_td_infos,
					  prop_attr_vars = st_attr_vars, prop_attr_env = st_attr_env, prop_error = ts.ts_error}
			  (st_result, _, {prop_type_heaps,prop_td_infos,prop_attr_vars,prop_error,prop_attr_env})
			  			= addPropagationAttributesToAType common_defs st_result ps
			  st = { st & st_args = st_args, st_result = st_result, st_attr_vars = prop_attr_vars, st_attr_env = prop_attr_env }
Sjaak Smetsers's avatar
Sjaak Smetsers committed
733
	   		# (copy_symb_type, cons_variables, ts) = freshSymbolType cWithFreshContextVars st common_defs { ts &
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
734
735
736
737
738
739
	   										ts_type_heaps = prop_type_heaps, ts_td_infos = prop_td_infos, ts_error = prop_error,
											ts_var_heap = ts.ts_var_heap <:= (type_ptr, VI_PropagationType st) }
			  (curried_st, ts) = currySymbolType copy_symb_type act_arity ts
			-> (curried_st, cons_variables, ts)

standardFieldSelectorType {glob_object={ds_ident,ds_index},glob_module} {ti_common_defs} ts=:{ts_var_store,ts_type_heaps}
740
	#! {sd_type,sd_exi_vars} = ti_common_defs.[glob_module].com_selector_defs.[ds_index]
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
741
	# (th_vars, ts_var_store) = freshExistentialVariables sd_exi_vars (ts_type_heaps.th_vars, ts_var_store)
Sjaak Smetsers's avatar
Sjaak Smetsers committed
742
	  (inst, cons_variables, ts) = freshSymbolType cWithFreshContextVars sd_type ti_common_defs { ts & ts_type_heaps = { ts_type_heaps & th_vars = th_vars }, ts_var_store = ts_var_store }
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
743
744
745
746
747
	= (inst, ts)
//		 ---> ("standardFieldSelectorType", ds_ident, inst)

standardTupleSelectorType {ds_index} arg_nr {ti_common_defs} ts
	#! {cons_type} = ti_common_defs.[cPredefinedModuleIndex].com_cons_defs.[ds_index]
Sjaak Smetsers's avatar
Sjaak Smetsers committed
748
	   (fresh_type, cons_variables, ts) = freshSymbolType cWithFreshContextVars { cons_type & st_args = [cons_type.st_result], st_result = cons_type.st_args !! arg_nr } ti_common_defs ts
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
749
750
751
752
753
	= (fresh_type, ts)

standardRhsConstructorType index mod arity {ti_common_defs} ts
	#! {cons_symb, cons_type, cons_exi_vars } = ti_common_defs.[mod].com_cons_defs.[index]
	# cons_type = { cons_type & st_vars = mapAppend (\{atv_variable} -> atv_variable) cons_exi_vars cons_type.st_vars }
Sjaak Smetsers's avatar
Sjaak Smetsers committed
754
	  (fresh_type, _, ts) = freshSymbolType cWithFreshContextVars cons_type ti_common_defs ts
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
755
756
757
758
759
760
	= currySymbolType fresh_type arity ts
//		 ---> ("standardRhsConstructorType", cons_symb, fresh_type)

standardLhsConstructorType index mod arity {ti_common_defs} ts=:{ts_var_store,ts_type_heaps}
	#! {cons_symb, cons_type, cons_exi_vars } = ti_common_defs.[mod].com_cons_defs.[index]
	# (th_vars, ts_var_store) = freshExistentialVariables cons_exi_vars (ts_type_heaps.th_vars, ts_var_store)
Sjaak Smetsers's avatar
Sjaak Smetsers committed
761
	  (fresh_type, _, ts) = freshSymbolType cWithFreshContextVars cons_type ti_common_defs { ts & ts_type_heaps = { ts_type_heaps & th_vars = th_vars }, ts_var_store = ts_var_store }
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
762
763
764
765
766
767
768
769
770
	= (fresh_type, ts)
//		 ---> ("standardLhsConstructorType", cons_symb, fresh_type)

:: ReferenceMarking :== Bool

cIsRecursive :== True
cIsNotRecursive :== False

storeAttribute (Yes expt_ptr) type_attribute symbol_heap
771
	= symbol_heap <:=  (expt_ptr, EI_Attribute (toInt type_attribute))
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
772
773
774
storeAttribute No type_attribute symbol_heap
	= symbol_heap

775
getSymbolType ti=:{ti_functions,ti_common_defs} {symb_kind = SK_Function {glob_module,glob_object}, symb_arity, symb_name} ts
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
776
	| glob_module == cIclModIndex
777
		# (fun_type, ts) = ts!ts_fun_env.[glob_object]
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
778
779
		= case fun_type of
			UncheckedType fun_type
780
781
				# (fun_type_copy, ts) = currySymbolType fun_type symb_arity ts
				-> (fun_type_copy, [], [], ts)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
782
			SpecifiedType fun_type lifted_arg_types _ 
Sjaak Smetsers's avatar
Sjaak Smetsers committed
783
784
785
				# (fun_type_copy=:{tst_args,tst_arity}, cons_variables, ts) = freshSymbolType cWithoutFreshContextVars fun_type ti_common_defs ts
				  (fun_type_copy, ts) = currySymbolType { fun_type_copy & tst_args = lifted_arg_types ++ fun_type_copy.tst_args,
				  										  tst_arity = tst_arity + length lifted_arg_types } symb_arity ts
786
				-> (fun_type_copy, cons_variables, [], ts)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
787
			CheckedType fun_type
Sjaak Smetsers's avatar
Sjaak Smetsers committed
788
				# (fun_type_copy, cons_variables, ts) = freshSymbolType cWithFreshContextVars fun_type ti_common_defs ts
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
789
				  (fun_type_copy,ts) = currySymbolType fun_type_copy symb_arity ts
790
				-> (fun_type_copy, cons_variables, [], ts)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
791
			_
792
				-> abort "getSymbolType (type.icl)" ---> (symb_name, fun_type)
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
793
794
		# {ft_type,ft_type_ptr,ft_specials} = ti_functions.[glob_module].[glob_object]
		  (fun_type_copy, cons_variables, ts) = determineSymbolTypeOfFunction symb_name symb_arity ft_type ft_type_ptr ti_common_defs ts
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
		= (fun_type_copy, cons_variables, get_specials ft_specials, ts)
	where
		get_specials (SP_ContextTypes specials) = specials
		get_specials SP_None 					= []
getSymbolType ti {symb_kind = SK_Constructor {glob_module,glob_object}, symb_arity} ts
	# (fresh_cons_type, ts) = standardRhsConstructorType glob_object glob_module symb_arity ti ts
	= (fresh_cons_type, [], [], ts) 
getSymbolType ti=:{ti_common_defs} {symb_kind = SK_OverloadedFunction {glob_module,glob_object}, symb_arity} ts
	# {me_symb, me_type,me_type_ptr} = ti_common_defs.[glob_module].com_member_defs.[glob_object]
	  (fun_type_copy, cons_variables, ts) = determineSymbolTypeOfFunction me_symb symb_arity me_type me_type_ptr ti_common_defs ts
	= (fun_type_copy, cons_variables, [], ts)

class requirements a :: !TypeInput !a !(!u:Requirements, !*TypeState) -> (!AType, !Optional ExprInfoPtr, !(!u:Requirements, !*TypeState))

instance requirements BoundVar
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
810
where
Sjaak Smetsers's avatar
Sjaak Smetsers committed
811
812
813
	requirements ti {var_name,var_info_ptr,var_expr_ptr} (reqs, ts)
		# (var_info, ts_var_heap) = readPtr var_info_ptr ts.ts_var_heap
		  ts = { ts & ts_var_heap = ts_var_heap }
814
815
816
817
818
819
820
821
/* JVG: changed to reduce allocation because the case is polymorphic and lazy in req and ts: */
		= (case var_info of
			VI_Type type
				-> type
			_
				-> abort ("requirements BoundVar" ---> (var_name <<- var_info))
			, Yes var_expr_ptr, (reqs, ts))
/*
Sjaak Smetsers's avatar
Sjaak Smetsers committed
822
823
824
825
826
		= case var_info of
			VI_Type type
				-> (type, Yes var_expr_ptr, (reqs, ts))
			_
				-> abort ("requirements BoundVar" ---> (var_name <<- var_info))
827
*/
828
instance requirements App
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
829
where
830
	requirements ti {app_symb,app_args,app_info_ptr} (reqs=:{req_cons_variables, req_attr_coercions}, ts)
Sjaak Smetsers's avatar
Sjaak Smetsers committed
831
		# (tst=:{tst_attr_env,tst_args,tst_result,tst_context}, cons_variables, specials, ts) = getSymbolType ti app_symb ts
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
	  	  reqs = { reqs & req_attr_coercions = tst_attr_env ++ req_attr_coercions, req_cons_variables = [cons_variables : req_cons_variables] }
	      (reqs, ts) = requirements_of_args ti app_args tst_args (reqs, ts)
		| isEmpty tst_context
			= (tst_result, No, (reqs, ts))
			= (tst_result, No, ({ reqs & req_overloaded_calls = [app_info_ptr : reqs.req_overloaded_calls ]}, 
					{ ts & ts_expr_heap = ts.ts_expr_heap <:= (app_info_ptr,
							EI_Overloaded { oc_symbol = app_symb, oc_context = tst_context, oc_specials = specials })}))
	where
		requirements_of_args :: !TypeInput ![Expression] ![AType] !(!u:Requirements, !*TypeState) -> (!u:Requirements, !*TypeState)
		requirements_of_args ti [] [] reqs_ts
			= reqs_ts
		requirements_of_args ti [expr:exprs] [lt:lts] reqs_ts
			# (e_type, opt_expr_ptr, (reqs, ts)) = requirements ti expr reqs_ts
			  req_type_coercions = [{ tc_demanded = lt, tc_offered = e_type, tc_position = { cp_expression = expr }, tc_coercible = True } : reqs.req_type_coercions ]
			  ts_expr_heap = storeAttribute opt_expr_ptr lt.at_attribute ts.ts_expr_heap
			= requirements_of_args ti exprs lts ({ reqs & req_type_coercions = req_type_coercions}, { ts & ts_expr_heap = ts_expr_heap })

instance requirements Case
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
850
where
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
	requirements ti {case_expr,case_guards,case_default,case_info_ptr} reqs_ts
		# (expr_type, opt_expr_ptr, (reqs, ts)) = requirements ti case_expr reqs_ts
		  (fresh_v, ts) = freshAttributedVariable ts
		  (cons_types, reqs_ts) = requirements_of_guarded_expressions ti case_guards case_expr expr_type opt_expr_ptr fresh_v (reqs, ts)
		  (reqs, ts) = requirements_of_default ti case_default fresh_v reqs_ts
		  ts_expr_heap =  ts.ts_expr_heap <:= (case_info_ptr, EI_CaseType { ct_pattern_type = expr_type, ct_result_type = fresh_v, ct_cons_types = cons_types })
		= (fresh_v, No, ({ reqs & req_case_and_let_exprs = [case_info_ptr : reqs.req_case_and_let_exprs]},
				{ ts & ts_expr_heap = ts_expr_heap }))
	where
		requirements_of_guarded_expressions ti=:{ti_common_defs} (AlgebraicPatterns alg_type patterns) match_expr pattern_type opt_pattern_ptr
						goal_type (reqs, ts)
			# (cons_types, result_type, new_attr_env, ts) = freshAlgebraicType alg_type patterns ti_common_defs ts
			  (used_cons_types, (reqs, ts)) = requirements_of_algebraic_patterns ti patterns cons_types goal_type [] (reqs, ts)
			  ts_expr_heap = storeAttribute opt_pattern_ptr result_type.at_attribute ts.ts_expr_heap
			= (reverse used_cons_types,  ({ reqs & req_type_coercions = [{tc_demanded = result_type,tc_offered = pattern_type, tc_position = { cp_expression = match_expr },
					tc_coercible = True} : reqs.req_type_coercions],
						req_attr_coercions = new_attr_env ++ reqs.req_attr_coercions }, { ts & ts_expr_heap = ts_expr_heap }))
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
868
	
869
870
871
872
873
874
875
876
877
878
879
880
		requirements_of_guarded_expressions ti (BasicPatterns bas_type patterns) match_expr pattern_type opt_pattern_ptr goal_type (reqs, ts)
			# (attr_bas_type, ts) = attributedBasicType bas_type ts
			  (reqs, ts) = requirements_of_basic_patterns ti patterns goal_type (reqs, ts)
			  ts_expr_heap = storeAttribute opt_pattern_ptr attr_bas_type.at_attribute ts.ts_expr_heap
			= ([], ({ reqs & req_type_coercions = [{tc_demanded = attr_bas_type,tc_offered = pattern_type, tc_position = { cp_expression = match_expr }, tc_coercible = True} :
						reqs.req_type_coercions]}, { ts & ts_expr_heap = ts_expr_heap }))
		requirements_of_guarded_expressions ti (DynamicPatterns dynamic_patterns) match_expr pattern_type opt_pattern_ptr goal_type reqs_ts
			# dyn_type = { at_type = TB BT_Dynamic, at_attribute = TA_Multi, at_annotation = AN_None }
			  (used_dyn_types, (reqs, ts)) = requirements_of_dynamic_patterns ti goal_type dynamic_patterns [] reqs_ts
			  ts_expr_heap = storeAttribute opt_pattern_ptr TA_Multi ts.ts_expr_heap
			= (reverse used_dyn_types, ({ reqs & req_type_coercions = [{tc_demanded = dyn_type, tc_offered = pattern_type, tc_position = { cp_expression = match_expr }, tc_coercible = True} :
						reqs.req_type_coercions] }, { ts & ts_expr_heap = ts_expr_heap }))
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
881
	
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
		requirements_of_algebraic_patterns ti [] cons_types goal_type used_cons_types reqs_ts
			= (used_cons_types, reqs_ts)
		requirements_of_algebraic_patterns ti=:{ti_common_defs}[{ap_vars, ap_expr }:gs] [ cons_arg_types : cons_types] goal_type used_cons_types (reqs, ts)
			# (res_type, opt_expr_ptr, (reqs, ts)) = requirements ti ap_expr (reqs, { ts & ts_var_heap = makeBase ap_vars cons_arg_types ts.ts_var_heap})
			  ts_expr_heap = storeAttribute opt_expr_ptr res_type.at_attribute ts.ts_expr_heap
			= requirements_of_algebraic_patterns ti gs cons_types goal_type [ cons_arg_types : used_cons_types ]
				({ reqs & req_type_coercions = [ { tc_demanded = goal_type, tc_offered = res_type, tc_position = { cp_expression = ap_expr }, tc_coercible = True } : reqs.req_type_coercions] },
					  { ts & ts_expr_heap = ts_expr_heap })
	
		requirements_of_basic_patterns _ [] goal_type reqs_ts
			= reqs_ts
		requirements_of_basic_patterns ti=:{ti_common_defs} [{bp_expr }:gs] goal_type reqs_ts
		  	# (res_type, opt_expr_ptr, (reqs, ts)) = requirements ti bp_expr reqs_ts
			  ts_expr_heap = storeAttribute opt_expr_ptr res_type.at_attribute ts.ts_expr_heap
			= requirements_of_basic_patterns ti gs goal_type
				({ reqs & req_type_coercions = [ { tc_demanded = goal_type, tc_offered = res_type, tc_position = { cp_expression = bp_expr }, tc_coercible = True } : reqs.req_type_coercions] },
						 { ts & ts_expr_heap = ts_expr_heap })
	
		requirements_of_dynamic_patterns ti goal_type [{dp_var={fv_info_ptr},dp_type,dp_rhs} : dps] used_dyn_types (reqs, ts=:{ts_expr_heap, ts_var_heap})
			# (EI_TempDynamicPattern _ _ _ _ dyn_type dyn_context dyn_expr_ptr type_code_symbol, ts_expr_heap) = readPtr dp_type ts_expr_heap
			  ts_var_heap = ts_var_heap <:= (fv_info_ptr, VI_Type dyn_type)
			  (dp_rhs_type, opt_expr_ptr, (reqs, ts)) = requirements ti dp_rhs (reqs, { ts & ts_expr_heap = ts_expr_heap, ts_var_heap = ts_var_heap })
			  ts_expr_heap = storeAttribute opt_expr_ptr dp_rhs_type.at_attribute ts.ts_expr_heap
			  type_coercion = { tc_demanded = goal_type, tc_offered = dp_rhs_type, tc_position = { cp_expression = dp_rhs }, tc_coercible = True }
			| isEmpty dyn_context
				# reqs = {reqs & req_type_coercions = [ type_coercion : reqs.req_type_coercions]}
				= requirements_of_dynamic_patterns ti goal_type dps [ [dyn_type] : used_dyn_types ] (reqs, { ts &  ts_expr_heap = ts_expr_heap })
				# reqs = { reqs & req_type_coercions = [ type_coercion : reqs.req_type_coercions], req_overloaded_calls = [dyn_expr_ptr : reqs.req_overloaded_calls ]}
				= requirements_of_dynamic_patterns ti goal_type dps [ [dyn_type] : used_dyn_types ] (reqs, { ts & ts_expr_heap = ts_expr_heap <:=
						(dyn_expr_ptr,  EI_Overloaded {  oc_symbol = type_code_symbol, oc_context = dyn_context, oc_specials = [] }) })
		requirements_of_dynamic_patterns ti goal_type [] used_dyn_types reqs_ts
			= (used_dyn_types, reqs_ts)
	
	
		requirements_of_default ti (Yes expr) goal_type reqs_ts
			# (res_type, opt_expr_ptr, (reqs,  ts)) = requirements ti expr reqs_ts
			  ts_expr_heap = storeAttribute opt_expr_ptr res_type.at_attribute ts.ts_expr_heap
			= ({ reqs & req_type_coercions = [ { tc_demanded = goal_type, tc_offered = res_type, tc_position = { cp_expression = expr }, tc_coercible = True } : reqs.req_type_coercions] },
					{ ts & ts_expr_heap = ts_expr_heap })
		requirements_of_default ti No goal_type reqs_ts
			= reqs_ts

instance requirements Let
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
925
where
Sjaak Smetsers's avatar
Sjaak Smetsers committed
926
927
928
	requirements ti {let_lazy_binds, let_strict_binds, let_expr, let_info_ptr} (reqs, ts)
		# let_binds = let_strict_binds ++ let_lazy_binds
		  (rev_var_types, ts) = make_base let_binds [] ts
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
		  var_types = reverse rev_var_types
		  (res_type, opt_expr_ptr, reqs_ts) = requirements ti let_expr (reqs, ts)
		  (reqs, ts) = requirements_of_binds ti let_binds var_types reqs_ts
		  ts_expr_heap = writePtr let_info_ptr (EI_LetType var_types) ts.ts_expr_heap
		= ( res_type, opt_expr_ptr, ({ reqs & req_case_and_let_exprs = [let_info_ptr : reqs.req_case_and_let_exprs]},{ ts & ts_expr_heap = ts_expr_heap }))
	where
	
		make_base [{bind_dst={fv_info_ptr}}:bs] var_types ts=:{ts_var_heap}
			# (v, ts) = freshAttributedVariable ts
			= make_base bs [v:var_types] { ts & ts_var_heap = writePtr fv_info_ptr (VI_Type v) ts.ts_var_heap }
		make_base [] var_types ts
			= (var_types, ts)
	
		requirements_of_binds _ [] _ reqs_ts
			= reqs_ts
		requirements_of_binds ti [{bind_src}:bs] [b_type:bts] reqs_ts
			# (exp_type, opt_expr_ptr, (reqs, ts)) = requirements ti bind_src reqs_ts
			  ts_expr_heap = storeAttribute opt_expr_ptr b_type.at_attribute ts.ts_expr_heap
			  req_type_coercions = [ { tc_demanded = b_type, tc_offered = exp_type, tc_position = { cp_expression = bind_src }, tc_coercible = True }
			  		: reqs.req_type_coercions ]
			= requirements_of_binds ti bs bts ({ reqs & req_type_coercions = req_type_coercions }, { ts & ts_expr_heap = ts_expr_heap })

instance requirements DynamicExpr
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
952
where
953
954
955
956
957
	requirements ti {dyn_expr,dyn_info_ptr} (reqs, ts=:{ts_expr_heap})
		# (EI_TempDynamicType _ dyn_type dyn_context dyn_expr_ptr type_code_symbol, ts_expr_heap) = readPtr dyn_info_ptr ts_expr_heap
		  (dyn_expr_type, opt_expr_ptr, (reqs, ts)) = requirements ti dyn_expr (reqs, { ts & ts_expr_heap = ts_expr_heap })
		  ts_expr_heap = storeAttribute opt_expr_ptr dyn_expr_type.at_attribute ts.ts_expr_heap
		  type_coercion = { tc_demanded = dyn_type, tc_offered = dyn_expr_type, tc_position = { cp_expression = dyn_expr }, tc_coercible = True }
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
958
		| isEmpty dyn_context
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
			= ({ at_type = TB BT_Dynamic, at_attribute = TA_Multi, at_annotation = AN_None }, No, 
					({reqs & req_type_coercions = [ type_coercion : reqs.req_type_coercions]}, 
						{ ts &  ts_expr_heap = ts_expr_heap }))
			= ({ at_type = TB BT_Dynamic, at_attribute = TA_Multi, at_annotation = AN_None }, No,
					({ reqs & req_type_coercions = [ type_coercion : reqs.req_type_coercions], req_overloaded_calls = [dyn_expr_ptr : reqs.req_overloaded_calls ]},
						{ ts & ts_expr_heap = ts_expr_heap <:= (dyn_expr_ptr, EI_Overloaded {
								oc_symbol = type_code_symbol, oc_context = dyn_context, oc_specials = []}) }))

instance requirements Expression
where
	requirements ti (Var var) reqs_ts
		= requirements ti var reqs_ts
	requirements ti (App app) reqs_ts
		= requirements ti app reqs_ts

	requirements ti (function @ args) reqs_ts
		# (off_fun_type, opt_fun_expr_ptr, reqs_ts) = requirements ti function reqs_ts
		  (rev_off_arg_types, (reqs, ts)) = requirements_of_list ti args [] reqs_ts
		  (alpha, ts) = freshAttributedVariable ts
		  (fun_type, req_type_coercions, ts) = apply_type rev_off_arg_types alpha reqs.req_type_coercions function ts
		  ts_expr_heap = storeAttribute opt_fun_expr_ptr fun_type.at_attribute ts.ts_expr_heap
		= (alpha, No, ({ reqs & req_type_coercions = [{ tc_demanded = fun_type, tc_offered = off_fun_type, tc_position = { cp_expression = function }, tc_coercible = True } : req_type_coercions ]}, { ts & ts_expr_heap = ts_expr_heap }))
	where
		requirements_of_list _ [] rev_list_types reqs_ts
			= (rev_list_types, reqs_ts)
		requirements_of_list ti [expr:exprs] rev_list_types reqs_ts
			# (e_type, opt_expr_ptr, reqs_ts) = requirements ti expr reqs_ts
			= requirements_of_list ti exprs [(opt_expr_ptr,e_type) : rev_list_types] reqs_ts
Ronny Wichers Schreur's avatar
Ronny Wichers Schreur committed
987
	
988
989
990
991
992
993
994
995
996
997
998
999
1000
		apply_type [] res_type type_coercions function ts
			= (res_type, type_coercions, ts)
		apply_type [(opt_expr_ptr,type) : types] res_type type_coercions function ts
			# (type, type_coercions, ts) = determine_demanded_type type opt_expr_ptr type_coercions function ts
			  (u, ts) = freshAttribute ts
			= apply_type types { at_annotation = AN_None, at_attribute = u, at_type = type --> res_type } type_coercions function ts
		
		determine_demanded_type :: !AType !(Optional ExprInfoPtr) ![TypeCoercion] !Expression !*TypeState
			-> (!AType, ![TypeCoercion], !*TypeState)
		determine_demanded_type type (Yes expr_ptr) type_coercions expr ts
			# (dem_type, ts) = freshAttributedVariable ts
			  ts_expr_heap = writePtr expr_ptr (EI_Attribute (toInt dem_type.at_attribute)) ts.ts_expr_heap
			= (dem_type, [ { tc_demanded = dem_type, tc_offered = type, tc_position = { cp_expression = expr }, tc_coercible = True } : type_coercions ],