syntax.dcl 37.1 KB
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definition module syntax

import StdEnv

import scanner, general, typeproperties, Heap

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PA_BUG on off :== on

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switch_import_syntax one_point_three two_point_zero :== one_point_three
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	/* when finally removing this switch also remove the argument of STE_Instance and ID_OldSyntax */

SwitchFusion fuse dont_fuse :== dont_fuse

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::	Ident =
	{ 	id_name		:: !String
	,	id_info 	:: !SymbolPtr
	}

instance toString Ident


/*	Each Identifier is equipped with a pointer to a SymbolTableEntry that is
	used for binding the identifier with its definition.
*/

::	SymbolTable			:== Heap SymbolTableEntry
::	SymbolPtr 			:== Ptr SymbolTableEntry

::	SymbolTableEntry = 
	{	ste_kind		:: !STE_Kind
	,	ste_index		:: !Index
	,	ste_def_level	:: !Level
	,	ste_previous	:: SymbolTableEntry
	}

::	STE_BoundTypeVariable	= { stv_count :: !Int, stv_attribute :: !TypeAttribute, stv_info_ptr :: !TypeVarInfoPtr}

::	STE_Kind	= STE_FunctionOrMacro ![Index]
				| STE_Type
				| STE_Constructor
				| STE_Selector ![Global Index]
				| STE_Field !Ident
				| STE_Class
				| STE_Member
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				| STE_Instance !Ident // argument: the class (used in explicitimports (1.3 syntax only))
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				| STE_Variable !VarInfoPtr
				| STE_TypeVariable !TypeVarInfoPtr
				| STE_TypeAttribute !AttrVarInfoPtr
				| STE_BoundTypeVariable !STE_BoundTypeVariable
				| STE_Imported !STE_Kind !Index
				| STE_DclFunction
				| STE_Module !(Module (CollectedDefinitions ClassInstance IndexRange))
				| STE_ClosedModule
				| STE_Empty
					/* for creating class dictionaries */
				| STE_DictType !CheckedTypeDef
				| STE_DictCons !ConsDef
				| STE_DictField !SelectorDef
				| STE_Called ![Index] /* used during macro expansion to indicate that this function is called */
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				| STE_ExplImp !Bool !(Optional ImportDeclaration) !STE_Kind !Bool /* auxiliary used in module explicitimports. */
					/*	1st arg: initialized with False and set to True when the searched symbol has been found to indicate.
						2nd arg: Yes: the ImportDeclaration with which it was intended to import the symbol. 
								 No: for symbols within a bracket (fields, constructors, members)
						3rd arg: for error messages: the expected namespace of the intended imported symbol
						4th arg: at first the idents for _all_ fields, constructors & members are added to the symbol table. In
								 case of a selective import like "... import :: R {f1}" this bit is used to remove all
								 fields different from "f1" from the symbol table again.
					*/
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				| STE_ExplImpSymbol !Int
				| STE_ExplImpComponentNrs ![ComponentNrAndIndex] ![Declaration]
					/*	stores the numbers of all module components that import the symbol from
						the "actual" dcl module. Further for each class the all encountered
						instances are accumulated.
					*/
				| STE_BelongingSymbol !Int

::	Declaration =
	{	dcl_ident	:: !Ident
	,	dcl_pos		:: !Position
	,	dcl_kind	:: !STE_Kind
	,	dcl_index	:: !Index
	}

::	ComponentNrAndIndex =
	{	cai_component_nr	:: !Int
	,	cai_index			:: !Int // points into ExplImpInfos
	}

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::	Global object =
	{	glob_object	:: !object
	,	glob_module	:: !Index
	}
	
::	Module defs = 
	{	mod_name		:: !Ident
	,	mod_type		:: !ModuleKind
	, 	mod_imports		:: ![ParsedImport]
	,	mod_imported_objects :: ![ImportedObject]
	,	mod_defs		:: !defs
	}

::	ParsedModule	:== Module  [ParsedDefinition]
::	ScannedModule 	:== Module  (CollectedDefinitions (ParsedInstance FunDef) IndexRange)
	
::	ModuleKind		= MK_Main | MK_Module | MK_System | MK_None

::	RhsDefsOfType	= ConsList ![ParsedConstructor]
					| SelectorList !Ident ![ATypeVar] ![ParsedSelector]
					| TypeSpec !AType
					| EmptyRhs !BITVECT

::	CollectedDefinitions instance_kind macro_defs =
	{	def_types 			:: ![TypeDef TypeRhs]
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	,	def_constructors	:: ![ConsDef]
	,	def_selectors		:: ![SelectorDef]
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	,	def_macros			:: !macro_defs
	,	def_classes			:: ![ClassDef]
	,	def_members			:: ![MemberDef]
	,	def_funtypes		:: ![FunType]
	,	def_instances		:: ![instance_kind]
	}

::	LocalDefs	= LocalParsedDefs [ParsedDefinition]
				| CollectedLocalDefs CollectedLocalDefs

::	IndexRange	= { ir_from :: !Index, ir_to :: !Index }

::  Index	:== Int
NoIndex		:== -1


::  Level	:== Int
NotALevel 	:==  -1

::	CollectedLocalDefs =
	{	loc_functions	:: !IndexRange
	,	loc_nodes		:: ![(Optional SymbolType, NodeDef ParsedExpr)]
	}

::	NodeDef dst =
	{	nd_dst		::!dst,
		nd_alts		::!OptGuardedAlts,
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		nd_locals	::!LocalDefs,
		nd_position	::!Position		
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	}

::	Rhs =
	{	rhs_alts	:: !OptGuardedAlts
	,	rhs_locals	:: !LocalDefs
	}


cIsAFunction	:== True
cIsNotAFunction :== False

::	ParsedDefinition 
	=	PD_Function  Position Ident Bool [ParsedExpr] Rhs FunKind
	|	PD_NodeDef  Position ParsedExpr Rhs
	|	PD_Type ParsedTypeDef
	|	PD_TypeSpec Position Ident Priority (Optional SymbolType) Specials
	|	PD_Class ClassDef [ParsedDefinition]
	|	PD_Instance (ParsedInstance ParsedDefinition)
	|	PD_Instances [ParsedInstance ParsedDefinition]
	|	PD_Import [ParsedImport]
	|	PD_ImportedObjects [ImportedObject]
	|	PD_Erroneous

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::	FunKind = FK_Function !Bool | FK_Macro | FK_Caf | FK_Unknown

::	DefOrImpFunKind = FK_DefFunction !Bool| FK_ImpFunction !Bool | FK_DefMacro | FK_ImpMacro | FK_ImpCaf | FK_DefOrImpUnknown

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cNameNotLocationDependent :== False
cNameLocationDependent :== True
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::	ParsedSelector =
	{	ps_field_name		:: !Ident
	,	ps_selector_name	:: !Ident
	,	ps_field_type		:: !AType
	,	ps_field_var		:: !Ident
	,	ps_field_pos		:: !Position
	}

::	ParsedConstructor =
	{	pc_cons_name 	:: !Ident
	,	pc_cons_arity	:: !Int
	,	pc_exi_vars		:: ![ATypeVar]
	,	pc_arg_types	:: ![AType]
	,	pc_cons_prio	:: !Priority
	,	pc_cons_pos		:: !Position
	}
	
::	ParsedInstance member =
	{	pi_class 	:: !Ident
	,	pi_ident	:: !Ident
	,	pi_types	:: ![Type]
	,	pi_context	:: ![TypeContext]
	,	pi_pos		:: !Position
	,	pi_members	:: ![member]
	,	pi_specials	:: !Specials
	}

/*
	Objects of type Specials are used to specify specialized instances of overloaded functions.
	These can only occur in definition modules. After parsing the SP_ParsedSubstitutions alternative
	is used to indicate the specific instantiation. The SP_Substitutions alternative is used to deduce
	the type of the specialized version. Finally the SP_ContextTypes alternative is set and used during 
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	the typing to check whether this instance has been used. The auxiliary SP_FunIndex alternative is used
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	to store the index of the function that has been specialized.
*/


::	Specials
	= SP_ParsedSubstitutions 	![Env Type TypeVar]
	| SP_Substitutions 		 	![SpecialSubstitution]
	| SP_ContextTypes			![Special]
	| SP_FunIndex				!Index
	| SP_TypeOffset				!Int
	| SP_None

::	SpecialSubstitution =
	{	ss_environ	:: !Env Type TypeVar
	,	ss_context	:: ![TypeContext]
	,	ss_vars		:: ![TypeVar]
	,	ss_attrs	:: ![AttributeVar]
	}

::	Special =
	{	spec_index	:: !Global Index
	,	spec_types	:: ![[Type]]
	,	spec_vars	:: ![TypeVar]
	, 	spec_attrs	:: ![AttributeVar]
	}

::	AttrInequality =
	{	ai_demanded :: !AttributeVar
	,	ai_offered	:: !AttributeVar
	}


::	DefinedSymbol = 
	{	ds_ident		:: !Ident
	,	ds_arity		:: !Int
	,	ds_index		:: !Index
	}

::	ClassDef =
 	{	class_name			:: !Ident
	,	class_arity			:: !Int
	,	class_args			:: ![TypeVar]
	,	class_context		:: ![TypeContext]
	,	class_members		:: !{# DefinedSymbol}
	,	class_dictionary	:: !DefinedSymbol
	,	class_pos			:: !Position
	,	class_cons_vars		:: !BITVECT
	}

::	MemberDef =
	{	me_symb			:: !Ident
	,	me_class		:: !Global Index
	,	me_offset		:: !Index
	,	me_type			:: !SymbolType
	,	me_type_ptr		:: !VarInfoPtr
	,	me_class_vars	:: ![TypeVar]
	,	me_pos			:: !Position
	,	me_priority 	:: !Priority
	}

::	InstanceType =
	{	it_vars			:: [TypeVar]
	,	it_types		:: ![Type]
	,	it_attr_vars	:: [AttributeVar]
	,	it_context		:: ![TypeContext]
	}

::	ClassInstance =
 	{	ins_class		:: !Global DefinedSymbol
	,	ins_ident		:: !Ident
	,	ins_type		:: !InstanceType
	,	ins_members		:: !{# DefinedSymbol}
	,	ins_specials	:: !Specials
	,	ins_pos			:: !Position
	}

/*
::	Export =
	{	export_class	:: Ident
	,	export_types	:: [Type]
	}
*/
::	Import from_symbol =
	{	import_module		:: !Ident
	,	import_symbols		:: ![from_symbol]
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	,	import_file_position:: !Position	// for error messages
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	}

instance toString (Import from_symbol), AttributeVar, TypeAttribute, Annotation

::	ParsedImport		:== Import ImportDeclaration

::	ImportedIdent =
	{	ii_ident	:: !Ident
	,	ii_extended	:: !Bool
	}

::	ImportDeclaration	= ID_Function !ImportedIdent
						| ID_Class !ImportedIdent !(Optional [ImportedIdent])
						| ID_Type !ImportedIdent !(Optional [ImportedIdent])
						| ID_Record !ImportedIdent !(Optional [ImportedIdent])
						| ID_Instance !ImportedIdent !Ident !(![Type],![TypeContext])
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						| ID_OldSyntax ![Ident]
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cIsImportedLibrary :== True
cIsImportedObject :== False
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:: ImportedObject =
	{	io_is_library :: !Bool
	,	io_name    :: !{#Char}
	}

::	RecordType =
	{	rt_constructor	:: !DefinedSymbol
	,	rt_fields		:: !{# FieldSymbol}
	}
	
::	FieldSymbol =
	{	fs_name			:: !Ident
	,	fs_var			:: !Ident
	,	fs_index		:: !Index
	}

::	TypeRhs	= AlgType ![DefinedSymbol]
			| SynType !AType
			| RecordType !RecordType
			| AbstractType !BITVECT
			| UnknownType

::	ParsedTypeDef	:== TypeDef RhsDefsOfType
::	CheckedTypeDef	:== TypeDef TypeRhs

/*
cIsHyperStrict		:== True
cIsNotHyperStrict	:== False
*/

cAllBitsClear			:== 0

cIsHyperStrict			:== 1
cIsNonCoercible			:== 2
// cMayBeNonCoercible		:== 4

::	TypeDef type_rhs =
 	{	td_name			:: !Ident
	,	td_index		:: !Int
	,	td_arity		:: !Int
	,	td_args			:: ![ATypeVar]
	,	td_attrs		:: ![AttributeVar]
	,	td_context		:: ![TypeContext]
	,	td_rhs			:: !type_rhs
	,	td_attribute	:: !TypeAttribute
	,	td_pos			:: !Position
	}

::	TypeDefInfo =
	{	tdi_kinds			:: ![TypeKind]
	,	tdi_properties		:: !BITVECT
	,	tdi_group			:: ![Global Index]
	,	tdi_group_nr		:: !Int
	,	tdi_group_vars		:: ![Int]
	,	tdi_cons_vars		:: ![Int]
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	,	tdi_tmp_index		:: !Int
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	,	tdi_classification	:: !TypeClassification
	}

::	TypeDefInfos :== {# .{# TypeDefInfo}}

::	FunType =
	{	ft_symb			:: !Ident
	,	ft_arity		:: !Int
	,	ft_priority		:: !Priority
	,	ft_type			:: !SymbolType
	,	ft_pos			:: !Position
	,	ft_specials		:: !Specials
	,	ft_type_ptr		:: !VarInfoPtr
	}

::	FreeVar =
	{	fv_def_level	:: !Level
	,	fv_name			:: !Ident
	,	fv_info_ptr		:: !VarInfoPtr
//	,	fv_expr_ptr		:: !ExprInfoPtr
	,	fv_count		:: !Int
	}
	
::	FunCall =
	{	fc_level	:: !Level
	,	fc_index	:: !Index
	}

::	FunInfo =
	{	fi_calls			:: ![FunCall]
	,	fi_group_index		:: !Index
	,	fi_def_level		:: !Level
	,	fi_free_vars		:: ![FreeVar]
	,	fi_local_vars		:: ![FreeVar]
	,	fi_dynamics			:: ![ExprInfoPtr]
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	,	fi_is_macro_fun		:: !Bool // whether the function is a local function of a macro
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	}

::	ParsedBody =
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	{	pb_args		:: ![ParsedExpr]
	,	pb_rhs		:: !Rhs
	,	pb_position	:: !Position
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	}

::	CheckedBody =
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	{	cb_args		:: ![FreeVar]
	,	cb_rhs		:: ![CheckedAlternative]
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	}

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::	CheckedAlternative =
	{	ca_rhs		:: !Expression
	,	ca_position	:: !Position	// the position is NoPos iff the position information for this
	}								// alternative is already stored in a case alternative
									// (in ap_position, bp_position or dp_position)

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::	TransformedBody =
	{	tb_args			:: ![FreeVar]
	,	tb_rhs			:: !Expression
	}

::	FunctionBody	= ParsedBody ![ParsedBody]
					| CheckedBody !CheckedBody
	/* The next three constructors are used during macro expansion (module transform) */
					| PartioningMacro
					| PartioningFunction !CheckedBody !Int
					| RhsMacroBody !CheckedBody
	/* macro expansion transforms a CheckedBody into a TransformedBody */
					| TransformedBody !TransformedBody
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					| Expanding ![FreeVar] // the parameters of the newly generated function
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					| BackendBody ![BackendBody]
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					| NoBody
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::	BackendBody =
	{	bb_args	:: ![FunctionPattern]
	,	bb_rhs	:: !Expression
	}

::	FunDef =
	{	fun_symb		:: !Ident
	,	fun_arity		:: !Int
	,	fun_priority	:: !Priority
	,	fun_body		:: !FunctionBody
	,	fun_type		:: !Optional SymbolType
	,	fun_pos			:: !Position
	,	fun_index		:: !Int
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	,	fun_kind		:: !DefOrImpFunKind
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	,	fun_lifted		:: !Int
//	,	fun_type_ptr	:: !TypeVarInfoPtr
	,	fun_info		:: !FunInfo
	}

cIsAGlobalVar	:== True
cIsALocalVar	:== False

::	ConsClasses =
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	{	cc_size			::!Int
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	,	cc_args			::![ConsClass]
	,	cc_linear_bits	::![Bool]
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	}
					
::	ConsClass	:== Int

::	OptionalVariable :== Optional (Bind Ident VarInfoPtr)

:: 	AuxiliaryPattern
		= AP_Algebraic !(Global DefinedSymbol) !Index [AuxiliaryPattern] OptionalVariable
		| AP_Variable !Ident !VarInfoPtr OptionalVariable
		| AP_Basic !BasicValue OptionalVariable
		| AP_Dynamic !AuxiliaryPattern !DynamicType !OptionalVariable
		| AP_Constant !AP_Kind !(Global DefinedSymbol) !Priority
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		| AP_WildCard !OptionalVariable
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		| AP_Empty !Ident

:: AP_Kind = APK_Constructor !Index | APK_Macro

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::	VarInfo  =	VI_Empty | VI_Type !AType !(Optional CoercionPosition) | VI_Occurrence !Occurrence | VI_UsedVar !Ident |
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				VI_Expression !Expression | VI_Variable !Ident !VarInfoPtr | VI_LiftedVariable !VarInfoPtr |
				VI_Count !Int /* the reference count of a variable */ !Bool /* true if the variable is global, false otherwise */ |
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				VI_AccVar !ConsClass !ArgumentPosition /* used during fusion to determine accumulating parameters of functions */ |
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				VI_Alias !BoundVar /* used for resolving aliases just before type checking (in transform) */ |
				 /* used during elimination and lifting of cases */
				VI_FreeVar !Ident !VarInfoPtr !Int !AType | VI_BoundVar !AType | VI_LocalVar |
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				VI_ClassVar !Ident !VarInfoPtr !Int | /* to hold dictionary variables during overloading */
				VI_ForwardClassVar !VarInfoPtr | /* to hold the dictionary variable generated during overloading */
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				VI_Forward !BoundVar | VI_LetVar !LetVarInfo | VI_LetExpression !LetExpressionInfo | VI_CaseVar !VarInfoPtr |
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				VI_CorrespondenceNumber !Int | /* it is assumed that this alternative is _only_ used in module comparedefimp */
				VI_SequenceNumber !Int |
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				VI_Used | /* for indicating that an imported function has been used */
				VI_PropagationType !SymbolType | /* for storing the type with propagation environment of an imported function */
				VI_ExpandedType !SymbolType | /* for storing the (expanded) type of an imported function */
				VI_Record ![AuxiliaryPattern] |
				VI_Pattern !AuxiliaryPattern |
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				VI_Default !Int | VI_Indirection !Int | /* used during conversion of dynamics; the Int indiacted the refenrence count */
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				VI_Body !SymbIdent !TransformedBody ![FreeVar] | /* used during fusion */
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				VI_Dictionary !SymbIdent ![Expression] !Type | /* used during fusion */
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				VI_Extended !ExtendedVarInfo !VarInfo |
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				VI_Defined /* for marking type code variables during overloading */ | VI_LocallyDefined |
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// MdM
				VI_CPSLocalExprVar !Int /* MdM - the index of the variable as generated by the theorem prover */
// ... MdM
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::	ExtendedVarInfo = EVI_VarType !AType
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::	ArgumentPosition :== Int

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::	VarInfoPtr	:== Ptr VarInfo

::	LetVarInfo =
	{	lvi_count		:: !Int
	,	lvi_depth		:: !Int
	,	lvi_new			:: !Bool
	,	lvi_var			:: !Ident
	,	lvi_expression	:: !Expression	
	,   lvi_previous	:: ![PreviousLetVarInfo]
	}

::	PreviousLetVarInfo =
	{	plvi_count		:: !Int
	,	plvi_depth		:: !Int
	,	plvi_new		:: !Bool
	}

::	LetExpressionStatus	= LES_Untouched | LES_Moved | LES_Updated !Expression

::	LetExpressionInfo =
	{	lei_count			:: !Int
	,	lei_depth			:: !Int 
	,	lei_var				:: !FreeVar 
	,   lei_expression		:: !Expression
	,   lei_status			:: !LetExpressionStatus
	,   lei_type			:: !AType
	}

cNotVarNumber :== -1

::	BoundVar = 
	{	var_name		:: !Ident
	,	var_info_ptr	:: !VarInfoPtr
	,	var_expr_ptr	:: !ExprInfoPtr
	}

/*
cRecursiveAppl		:== True
cNonRecursiveAppl	:== False	

::	ApplicationKind	:== Bool
*/
 
::	TypeSymbIdent =
	{	type_name		:: !Ident
	,	type_arity		:: !Int
	,	type_index		:: !Global Index
	,	type_prop		:: !TypeSymbProperties
	}

::	TypeSymbProperties =
	{	tsp_sign		:: !SignClassification
	,	tsp_propagation	:: !PropClassification
	,	tsp_coercible	:: !Bool
	}

::	SymbKind	= SK_Unknown
				| SK_Function !(Global Index)
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				| SK_LocalMacroFunction !Index
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				| SK_OverloadedFunction !(Global Index)
				| SK_Constructor !(Global Index)
				| SK_Macro !(Global Index)
//				| SK_RecordSelector !(Global Index)
				| SK_GeneratedFunction !FunctionInfoPtr !Index
				| SK_TypeCode

/*	Some auxiliary type definitions used during fusion. Actually, these definitions
	should have been given in seperate module. Unfortunately, Clean's module system
	forbids cyclic dependencies between def modules.
	
*/

::	FunctionHeap 	:== Heap FunctionInfo

::	FunctionInfoPtr	:== Ptr FunctionInfo

::	FunctionInfo	= FI_Empty | FI_Function !GeneratedFunction

::	Producer	= PR_Empty
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				| PR_Function !SymbIdent !Index
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				| PR_Class !App ![BoundVar] !Type
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//				| PR_Constructor !SymbIdent ![Expression]
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				| PR_GeneratedFunction !SymbIdent !Index
				| PR_Curried !SymbIdent
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::	InstanceInfo = II_Empty | II_Node !{! Producer} !FunctionInfoPtr !InstanceInfo !InstanceInfo

::	GeneratedFunction = 
	{	gf_fun_def			:: !FunDef
	,	gf_instance_info	:: !InstanceInfo
	,	gf_cons_args		:: !ConsClasses
	,	gf_fun_index		:: !Index
	}
	
/*	... main type definitions continued .... */

::	ExpressionHeap 	:== Heap ExprInfo

::	ExprInfoPtr		:== Ptr ExprInfo

::	TempLocalVar	:== Int

::	DynamicPtr		:== ExprInfoPtr

::	ExprInfo		= EI_Empty

		/* For handling overloading */

					| EI_Overloaded !OverloadedCall 						/* initial, set by the type checker */
					| EI_Instance 	!(Global DefinedSymbol) ![Expression]	/* intermedediate, used during resolving of overloading */ 
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//					| EI_Selection 	![Selection] !BoundVar ![Expression]	/* intermedediate, used during resolving of overloading */
					| EI_Selection 	![Selection] !VarInfoPtr ![Expression]	/* intermedediate, used during resolving of overloading */
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					| EI_Context 	![Expression]							/* intermedediate, used during resolving of overloading */

		/* For handling dynamics */

					| EI_Dynamic 				!(Optional DynamicType)
					| EI_DynamicType			!DynamicType ![DynamicPtr]
//					| EI_DynamicType			!DynamicType !(Optional ExprInfoPtr)

		/* Auxiliary, was EI_DynamicType before checking */

					| EI_DynamicTypeWithVars	![TypeVar] !DynamicType ![DynamicPtr]				
//					| EI_DynamicTypeWithVars	![TypeVar] !DynamicType !(Optional ExprInfoPtr)			

		/* Auxiliary, used during type checking */

					| EI_TempDynamicType 		!(Optional DynamicType) !AType ![TypeContext] !ExprInfoPtr !SymbIdent
//					| EI_TempDynamicPattern 	![TypeVar] !DynamicType !(Optional ExprInfoPtr) ![TempLocalVar] !AType ![TypeContext] !ExprInfoPtr !SymbIdent
					| EI_TempDynamicPattern 	![TypeVar] !DynamicType ![DynamicPtr] ![TempLocalVar] !AType ![TypeContext] !ExprInfoPtr !SymbIdent
					
					| EI_TypeOfDynamic 			![VarInfoPtr] !TypeCodeExpression				/* Final */
					| EI_TypeOfDynamicPattern 	![VarInfoPtr] !TypeCodeExpression				/* Final */

					| EI_TypeCode 		!TypeCodeExpression
					| EI_TypeCodes 		![TypeCodeExpression]

					| EI_Attribute !Int


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		/* EI_DictionaryType is used to store the instance type of a class. This type are used during fusion to generate proper types for 
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		   the fusion result (i.e. the resulting function after elimination of dictionaries) */

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					| EI_DictionaryType !Type
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					| EI_CaseType !CaseType
					| EI_LetType ![AType]
					| EI_CaseTypeAndRefCounts !CaseType !RefCountsInCase
					| EI_LetTypeAndRefCounts ![AType] ![Int]

		/* for converting case into function patterns the following auxiliary constuctors are used */

					| EI_Default !Expression !AType !ExprInfoPtr
					| EI_DefaultFunction !SymbIdent ![Expression]
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					| EI_Extended !ExtendedExprInfo !ExprInfo
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::	ExtendedExprInfo
					= EEI_ActiveCase !ActiveCaseInfo

::	ActiveCaseInfo =
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	{	aci_params					:: ![FreeVar]
	,	aci_opt_unfolder			:: !(Optional SymbIdent)
	,	aci_free_vars				:: !Optional [BoundVar]
	,	aci_linearity_of_patterns	:: ![[Bool]]
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	}
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::	RefCountsInCase = 
	{	rcc_all_variables		:: ![CountedVariable]
	,	rcc_default_variables	:: ![CountedVariable]
	,	rcc_pattern_variables	:: ![[CountedVariable]]
	}

::	CountedVariable =
	{	cv_variable	:: !VarInfoPtr
	,	cv_count	:: !Int
	}

/*
::	UnboundVariable =
	{	free_name		:: !Ident
	,	free_info_ptr	:: !VarInfoPtr
	,	free_selections	:: ![Int]
	}
*/

/*
	OverloadedCall contains (type) information about functions that are overloaded. This structure is built during type checking
	and used after (standard) unification to insert the proper instances of the corresponding functions.

*/

::	OverloadedCall = 
	{	oc_symbol	:: !SymbIdent
	,	oc_context	:: ![TypeContext]
	,	oc_specials	:: ![Special]
	}

/*
	CaseType contains the type information needed to type the corresponding case construct:
		ct_pattern_type : the type of the pattern
		ct_result_type  : the type of the result (of each pattern)
		ct_cons_types   : the types of the arguments of each pattern constructor
*/
		
::	CaseType =
	{	ct_pattern_type	:: !AType
	,	ct_result_type	:: !AType
	,	ct_cons_types 	:: ![[AType]]
	}
		
::	SymbIdent =
	{	symb_name		:: !Ident
	,	symb_kind		:: !SymbKind
	,	symb_arity		:: !Int
	}

::	ConsDef =
	{	cons_symb			:: !Ident
	,	cons_type			:: !SymbolType
	,	cons_arg_vars		:: ![[ATypeVar]]
	,	cons_priority		:: !Priority
	,	cons_index			:: !Index
	,	cons_type_index		:: !Index
	,	cons_exi_vars		:: ![ATypeVar]
//	,	cons_exi_attrs		:: ![AttributeVar]
	,	cons_type_ptr		:: !VarInfoPtr
	,	cons_pos			:: !Position
	}

::	SelectorDef =
	{	sd_symb			:: !Ident
	,	sd_field		:: !Ident
	,	sd_type			:: !SymbolType
	,	sd_exi_vars		:: ![ATypeVar]
//	,	sd_exi_attrs	:: ![AttributeVar]
	,	sd_field_nr		:: !Int
	,	sd_type_index	:: !Int
	,	sd_type_ptr		:: !VarInfoPtr
	,	sd_pos			:: !Position
	}

::	SymbolType =
	{	st_vars			:: ![TypeVar]
	,	st_args			:: ![AType]
	,	st_arity		:: !Int
	,	st_result		:: !AType
	,	st_context		:: ![TypeContext]
	,	st_attr_vars	:: ![AttributeVar]
	,	st_attr_env		:: ![AttrInequality]
	}

::	TypeContext =
	{	tc_class	:: !Global DefinedSymbol
	,	tc_types	:: ![Type]
	,	tc_var		:: !VarInfoPtr
	}

::	AType =
	{	at_attribute	:: !TypeAttribute
	,	at_annotation	:: !Annotation
	,	at_type			:: !Type
	}
	
::	TempAttrId		:== Int
::	TempVarId		:== Int


::	Type	=	TA !TypeSymbIdent ![AType]
			|	(-->) infixr 9 !AType !AType
			|	(:@:) infixl 9 !ConsVariable ![AType]
			|	TB !BasicType

//			|	TFA [ATypeVar] Type

			| 	GTV !TypeVar
			| 	TV !TypeVar
			|	TempV !TempVarId				/* Auxiliary, used during type checking */

			
			|	TQV	TypeVar
			|	TempQV !TempVarId				/* Auxiliary, used during type checking */

			|	TLifted !TypeVar				/* Auxiliary, used during type checking of lifted arguments */
			|	TE

::	ConsVariable = CV 		!TypeVar
				 | TempCV 	!TempVarId
				 | TempQCV 	!TempVarId

::	DynamicType =
	{	dt_uni_vars 	:: ![ATypeVar]
	,	dt_global_vars	:: ![TypeVar]
	,	dt_type			:: !AType
	}

::	KindHeap	:== Heap KindInfo
::	KindInfoPtr	:== Ptr KindInfo

::	KindInfo	= KI_Var !KindInfoPtr
				| KI_Indirection !KindInfo
				| KI_Arrow ![KindInfo]
				| KI_Const
				
				| KI_ConsVar
				
				| KI_VarBind !KindInfoPtr
				| KI_NormVar !Int

::	TypeVarInfo  	= TVI_Empty
					| TVI_Type !Type
					| TVI_Forward !TempVarId | TVI_TypeKind !KindInfoPtr
					| TVI_SignClass !Index !SignClassification !TypeVarInfo | TVI_PropClass !Index !PropClassification !TypeVarInfo
					| TVI_Attribute TypeAttribute
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					| TVI_CorrespondenceNumber !Int /* auxiliary used in module comparedefimp */
					| TVI_AType !AType /* auxiliary used in module comparedefimp */
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					| TVI_Used /* to administer that this variable is encountered (in checkOpenTypes) */
					| TVI_TypeCode !TypeCodeExpression
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					| TVI_CPSLocalTypeVar !Int /* MdM - the index of the variable as generated by the theorem prover */
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::	TypeVarInfoPtr	:== Ptr TypeVarInfo
::	TypeVarHeap 	:== Heap TypeVarInfo

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::	AttrVarInfo  	= AVI_Empty | AVI_Attr !TypeAttribute | AVI_Forward !TempAttrId 
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					| AVI_CorrespondenceNumber !Int /* auxiliary used in module comparedefimp */
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					| AVI_Used
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					| AVI_Count !Int /* auxiliary used in module typesupport */
					
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::	AttrVarInfoPtr	:== Ptr AttrVarInfo
::	AttrVarHeap 	:== Heap AttrVarInfo

::	TypeHeaps =
	{	th_vars		:: ! .TypeVarHeap
	,	th_attrs	:: ! .AttrVarHeap
	}

::	TypeVar =
	{	tv_name				:: !Ident
	,	tv_info_ptr			:: !TypeVarInfoPtr
	}

::	ATypeVar =
	{	atv_attribute		:: !TypeAttribute
	,	atv_annotation		:: !Annotation
	,	atv_variable		:: !TypeVar
	}

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::	TypeAttribute = TA_Unique | TA_Multi | TA_Var !AttributeVar | TA_RootVar AttributeVar | TA_TempVar !Int  | TA_TempExVar
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					| TA_Anonymous | TA_None
					| TA_List !Int !TypeAttribute | TA_Locked !TypeAttribute
					| TA_MultiOfPropagatingConsVar // only filled in after type checking, semantically equal to TA_Multi
							
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::	AttributeVar =
	{	av_name			:: !Ident
	,	av_info_ptr		:: !AttrVarInfoPtr
	}

::	Annotation	=  AN_Strict | AN_None 

::	BasicType	= BT_Int | BT_Char | BT_Real | BT_Bool | BT_Dynamic
				| BT_File | BT_World
				| BT_String !Type /* the internal string type synonym only used to type string denotations */

::	BasicValue	= BVI !String | BVC !String | BVB !Bool | BVR !String | BVS !String


::	TypeKind = KindVar !KindInfoPtr | KindConst | KindArrow !Int

/* A few obscure type definitions */

::	Occurrence =
	{	occ_ref_count	:: !ReferenceCount
//	,	occ_aliases		:: ![[(FreeVar,Int)]]
//	,	occ_expression	:: !Expression
	,	occ_bind		:: !OccurrenceBinding
	,	occ_observing	:: !Bool
//	,	occ_attribute	:: !ExprInfoPtr
	,	occ_previous 	:: ![ReferenceCount]
	}

::	ReferenceCount = RC_Used !RC_Used | RC_Unused 

::	SelectiveUse = { su_field :: !Int, su_multiply :: ![ExprInfoPtr], su_uniquely :: ![ExprInfoPtr]  }

::	RC_Used = { rcu_multiply :: ![ExprInfoPtr], rcu_selectively :: ![SelectiveUse], rcu_uniquely :: ![ExprInfoPtr] }

::	OccurrenceBinding	= OB_Empty | OB_OpenLet !Expression | OB_LockedLet !Expression
						| OB_Pattern ![(FreeVar, Int)] !OccurrenceBinding
//						| OB_Closed !LetOccurrences | OB_Marked !LetOccurrences

/*
::	LetOccurrences =
	{	lo_used_lets		:: ![FreeVar]
	,	lo_free_variables	:: ![(FreeVar, ReferenceCount)]
	}
*/
::	OptGuardedAlts	= GuardedAlts ![GuardedExpr] !(Optional ExprWithLocalDefs)
				 	| UnGuardedExpr !ExprWithLocalDefs

::	GuardedExpr =
	{	alt_nodes	:: ![NodeDefWithLocals]
	,	alt_guard	:: !ParsedExpr
	,	alt_expr	:: !OptGuardedAlts
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	,	alt_ident	:: !Ident
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	,	alt_position:: !Position
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	}

::	ExprWithLocalDefs = 
	{	ewl_nodes	:: ![NodeDefWithLocals]
	,	ewl_expr	:: !ParsedExpr
	,	ewl_locals	:: !LocalDefs
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	,	ewl_position:: !Position
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	}

::	NodeDefWithLocals =
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	{	ndwl_strict		:: !Bool
	,	ndwl_def		:: !Bind ParsedExpr ParsedExpr
	,	ndwl_locals		:: !LocalDefs
	,	ndwl_position	:: !Position
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	}

::	CaseAlt =
	{	calt_pattern	:: !ParsedExpr
	,	calt_rhs		:: !Rhs
	}
	
:: LocalDef		:== ParsedDefinition

cUniqueSelection	:== True
cNonUniqueSelection	:== False

::	ParsedExpr	= PE_List ![ParsedExpr]
				| PE_Ident !Ident
				| PE_Basic !BasicValue
				| PE_Bound !BoundExpr
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				| PE_Lambda !Ident ![ParsedExpr] !ParsedExpr !Position
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				| PE_Tuple ![ParsedExpr]				
				| PE_Record !ParsedExpr !(Optional Ident) ![FieldAssignment]
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				| PE_ArrayPattern ![ElemAssignment]
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				| PE_UpdateComprehension !ParsedExpr !ParsedExpr !ParsedExpr ![Qualifier]
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				| PE_ArrayDenot ![ParsedExpr]
				| PE_Selection !Bool !ParsedExpr ![ParsedSelection]
				| PE_Update !ParsedExpr [ParsedSelection] ParsedExpr
				| PE_Case !Ident !ParsedExpr [CaseAlt]
				| PE_If !Ident !ParsedExpr !ParsedExpr !ParsedExpr
				| PE_Let !Bool !LocalDefs !ParsedExpr
				| PE_Compr !GeneratorKind !ParsedExpr ![Qualifier]
				| PE_Sequ Sequence
				| PE_WildCard
				| PE_Field !ParsedExpr !(Global FieldSymbol) /* Auxiliary, used during checking */

				| PE_ABC_Code ![String] !Bool
				| PE_Any_Code !(CodeBinding Ident) !(CodeBinding Ident) ![String]

				| PE_DynamicPattern !ParsedExpr !DynamicType
				| PE_Dynamic !ParsedExpr !(Optional DynamicType)
				| PE_Empty

::	ParsedSelection	= PS_Record !Ident !(Optional Ident)
					| PS_Array  !ParsedExpr
					| PS_Erroneous

::	GeneratorKind :== Bool

cIsListGenerator 	:== True
cIsArrayGenerator	:== False
			
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:: LineAndColumn = {lc_line :: !Int, lc_column :: !Int}

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::	Generator =
	{	gen_kind	:: !GeneratorKind
	,	gen_pattern :: !ParsedExpr
	,	gen_expr	:: !ParsedExpr
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	,	gen_position :: !LineAndColumn
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	}

::	Qualifier	=
	{	qual_generators	:: ![Generator]
	,	qual_filter		:: !Optional ParsedExpr
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	,	qual_position	:: !LineAndColumn
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	,	qual_filename	:: !FileName
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	}

::	Sequence	= SQ_FromThen ParsedExpr ParsedExpr
				| SQ_FromThenTo ParsedExpr ParsedExpr ParsedExpr
				| SQ_From ParsedExpr
				| SQ_FromTo ParsedExpr ParsedExpr
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