definition module unitype

import StdEnv
import syntax, analunitypes

::	CoercionState =
	{	crc_type_heaps	:: !.TypeHeaps
	,	crc_coercions	:: !.Coercions
	,	crc_td_infos	:: !.TypeDefInfos
	}

class coerce a ::  !Sign !{# CommonDefs} !{# BOOLVECT} !TypePosition !a !a !*CoercionState -> (!Optional TypePosition, !*CoercionState)

instance coerce AType

::	TypePosition :== [Int]

AttrUni			:== 0
AttrMulti		:== 1
AttrExi			:== 2
FirstAttrVar	:== 3

instance toInt TypeAttribute

::	CoercionTree	= CT_Node !Int !CoercionTree !CoercionTree | CT_Empty | CT_Unique | CT_NonUnique  | CT_Existential

::	Coercions		= { coer_demanded :: !.{! .CoercionTree}, coer_offered :: !.{! .CoercionTree }}

isNonUnique				:: !CoercionTree -> Bool
isUnique  				:: !CoercionTree -> Bool
isExistential  			:: !CoercionTree -> Bool

isNonUniqueAttribute	:: !Int !Coercions -> Bool
isUniqueAttribute		:: !Int !Coercions -> Bool

::	BOOLVECT :== Int

BITINDEX temp_var_id :== temp_var_id >> 5
BITNUMBER temp_var_id :== temp_var_id bitand 31
set_bit :: !Int !*{# BOOLVECT} -> .{# BOOLVECT}

determineAttributeCoercions :: !AType !AType !Bool !u:{! Type} !*Coercions !{# CommonDefs } 
	!{# BOOLVECT } !*TypeDefInfos !*TypeHeaps
		-> (!Optional (TypePosition, AType), !u:{! Type}, !*Coercions, !*TypeDefInfos, !*TypeHeaps) 

::	AttributePartition	:== {# Int}

partitionateAttributes :: !{! CoercionTree} !{! *CoercionTree} -> (!AttributePartition, !*{! CoercionTree})

newInequality :: !Int !Int !*Coercions -> *Coercions

tryToMakeNonUnique :: !Int !*Coercions -> (!Bool, !*Coercions)

tryToMakeUnique :: !Int !*Coercions -> (!Bool, !*Coercions)

uniquenessErrorVar :: !FreeVar !FunctionBody !String !*ErrorAdmin -> *ErrorAdmin

liftSubstitution :: !*{! Type} !{# CommonDefs }!{# BOOLVECT } !Int !*TypeHeaps !*TypeDefInfos -> (*{! Type}, !Int, !*TypeHeaps, !*TypeDefInfos)

::	ExpansionState = 
	{	es_type_heaps	:: !.TypeHeaps
	,	es_td_infos		:: !.TypeDefInfos
	}

class expandType a :: !{# CommonDefs } !{# BOOLVECT } !a !*(!u:{! Type}, !*ExpansionState) -> (!Bool, !a, !*(!u:{! Type}, !*ExpansionState))

instance expandType AType

checkExistentionalAttributeVars :: [TempAttrId] !AttributePartition !*{! CoercionTree} -> (!Bool,!*{! CoercionTree})

copyCoercions :: *Coercions -> (*Coercions, *Coercions)
