transform.icl

implementation module transform

import syntax, utilities, mergecases

::	LiftState =
	{	ls_var_heap		:: !.VarHeap
	,	ls_x 			:: !.LiftStateX
	,	ls_expr_heap	:: !.ExpressionHeap
	}

::	LiftStateX = {
		x_fun_defs :: !.{#FunDef},
		x_macro_defs :: !.{#.{#FunDef}},
		x_main_dcl_module_n :: !Int
	}

class lift a :: !a !*LiftState -> (!a, !*LiftState)

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

instance lift (a,b) | lift a & lift b
where
	lift t ls = app2St (lift,lift) t ls

instance lift (Optional a) | lift a
where
	lift (Yes x) ls
		# (x, ls) = lift x ls
		= (Yes x, ls)
	lift no ls
		= (no, ls)
	
instance lift CheckedAlternative
where
	lift ca=:{ca_rhs} ls
		# (ca_rhs, ls) = lift ca_rhs ls
		= ({ ca & ca_rhs = ca_rhs }, ls)
	
instance lift Expression
where
	lift (FreeVar {fv_ident,fv_info_ptr}) ls=:{ls_var_heap}
		# (var_info, ls_var_heap) = readPtr fv_info_ptr ls_var_heap
		  ls = { ls & ls_var_heap = ls_var_heap }
		= case var_info of
			 VI_LiftedVariable var_info_ptr
			 	# (var_expr_ptr, ls_expr_heap) = newPtr EI_Empty ls.ls_expr_heap
			 	-> (Var { var_ident = fv_ident, var_info_ptr = var_info_ptr, var_expr_ptr = var_expr_ptr }, { ls & ls_expr_heap = ls_expr_heap})
			 _
			 	# (var_expr_ptr, ls_expr_heap) = newPtr EI_Empty ls.ls_expr_heap
			 	-> (Var { var_ident = fv_ident, var_info_ptr = fv_info_ptr, var_expr_ptr = var_expr_ptr }, { ls & ls_expr_heap = ls_expr_heap})
	lift (App app) ls
		# (app, ls) = lift app ls
		= (App app, ls)
	lift (expr @ exprs) ls
		# ((expr,exprs), ls) = lift (expr,exprs) ls
		= (expr @ exprs, ls)
	lift (Let lad=:{let_strict_binds, let_lazy_binds, let_expr}) ls
		# (let_strict_binds, ls) = lift let_strict_binds ls
		  (let_lazy_binds, ls) = lift let_lazy_binds ls
		  (let_expr, ls) = lift let_expr ls
		= (Let {lad & let_strict_binds = let_strict_binds, let_lazy_binds = let_lazy_binds, let_expr = let_expr}, ls)
	lift (Case case_expr) ls
		# (case_expr, ls) = lift case_expr ls
		= (Case case_expr, ls)
	lift (Selection is_unique expr selectors) ls
		# (selectors, ls) = lift selectors ls
		  (expr, ls) = lift expr ls
		= (Selection is_unique expr selectors, ls)
	lift (Update expr1 selectors expr2) ls
		# (selectors, ls) = lift selectors ls
		  (expr1, ls) = lift expr1 ls
		  (expr2, ls) = lift expr2 ls
		= (Update expr1 selectors expr2, ls)
	lift (RecordUpdate cons_symbol expression expressions) ls
		# (expression, ls) = lift expression ls
		  (expressions, ls) = lift expressions ls
		= (RecordUpdate cons_symbol expression expressions, ls)
	lift (TupleSelect symbol argn_nr expr) ls
		# (expr, ls) = lift expr ls
		= (TupleSelect symbol argn_nr expr, ls)
	lift (MatchExpr cons_ident expr) ls
		# (expr, ls) = lift expr ls
		= (MatchExpr cons_ident expr, ls)
	lift (DynamicExpr expr) ls
		# (expr, ls) = lift expr ls
		= (DynamicExpr expr, ls)
	lift (IsConstructor expr cons_symbol cons_arity global_type_index case_ident position) ls
		# (expr, ls) = lift expr ls
		= (IsConstructor expr cons_symbol cons_arity global_type_index case_ident position, ls)
	lift (TypeSignature type_function expr) ls
		# (expr, ls) = lift expr ls
		= (TypeSignature type_function expr, ls)
	lift expr ls
		= (expr, ls)

instance lift Selection
where
	lift (ArraySelection array_select expr_ptr index_expr) ls
		# (index_expr, ls) = lift index_expr ls
		= (ArraySelection array_select expr_ptr index_expr, ls)
	lift record_selection ls
		= (record_selection, ls)

instance lift App
where
	lift app=:{app_symb = app_symbol=:{symb_kind = SK_Function {glob_object,glob_module}}, app_args} ls
		| glob_module == ls.ls_x.LiftStateX.x_main_dcl_module_n
			# (fun_def,ls) = ls!ls_x.x_fun_defs.[glob_object]
			= lift_function_app app fun_def.fun_info.fi_free_vars ls
			# (app_args, ls) = lift app_args ls
			= ({ app & app_args = app_args }, ls)
	lift app=:{app_symb = {symb_kind = SK_LocalMacroFunction glob_object},app_args} ls
		# (fun_def,ls) = ls!ls_x.x_fun_defs.[glob_object]
		= lift_function_app app fun_def.fun_info.fi_free_vars ls
	lift app=:{app_symb = {symb_kind = SK_LocalDclMacroFunction {glob_object,glob_module}}} ls
		# (fun_def,ls) = ls!ls_x.x_macro_defs.[glob_module,glob_object]
		= lift_function_app app fun_def.fun_info.fi_free_vars ls
	lift app=:{app_args} ls
		# (app_args, ls) = lift app_args ls
		= ({ app & app_args = app_args }, ls)

lift_function_app app=:{app_symb=app_symbol,app_args} [] ls
	# (app_args, ls) = lift app_args ls
	= ({ app & app_args = app_args }, ls)
lift_function_app app=:{app_args} fi_free_vars ls
	# (app_args, ls) = lift app_args ls
	# (app_args, ls_var_heap, ls_expr_heap) = add_free_variables_in_app fi_free_vars app_args ls.ls_var_heap ls.ls_expr_heap
	# app = { app & app_args = app_args }
	= (app,	{ ls & ls_var_heap = ls_var_heap, ls_expr_heap = ls_expr_heap })
where
	add_free_variables_in_app :: ![FreeVar] ![Expression] !*VarHeap !*ExpressionHeap -> (![Expression],!*VarHeap,!*ExpressionHeap)
	add_free_variables_in_app [] app_args var_heap expr_heap
		= (app_args, var_heap, expr_heap)
	add_free_variables_in_app [{fv_ident, fv_info_ptr} : free_vars] app_args var_heap expr_heap
		# (var_info,var_heap) = readPtr fv_info_ptr var_heap
		= case var_info of
			VI_LiftedVariable var_info_ptr
			 	# (var_expr_ptr, expr_heap) = newPtr EI_Empty expr_heap
				-> add_free_variables_in_app free_vars [Var { var_ident = fv_ident, var_info_ptr = var_info_ptr, var_expr_ptr = var_expr_ptr } : app_args]
						var_heap expr_heap
			_
			 	# (var_expr_ptr, expr_heap) = newPtr EI_Empty expr_heap
				-> add_free_variables_in_app free_vars [Var { var_ident = fv_ident, var_info_ptr = fv_info_ptr, var_expr_ptr = var_expr_ptr } : app_args]
						var_heap expr_heap

instance lift LetBind
where
	lift bind=:{lb_src} ls
		# (lb_src, ls) = lift lb_src ls
		= ({ bind & lb_src = lb_src }, ls)

instance lift (Bind a b) | lift a
where
	lift bind=:{bind_src} ls
		# (bind_src, ls) = lift bind_src ls
		= ({ bind & bind_src = bind_src }, ls)

instance lift Case
where
	lift kees=:{ case_expr,case_guards,case_default } ls
		# ((case_expr,(case_guards,case_default)), ls) = lift (case_expr,(case_guards,case_default)) ls
		= ({ kees & case_expr = case_expr,case_guards = case_guards, case_default = case_default }, ls)

instance lift CasePatterns
where
	lift (AlgebraicPatterns type patterns) ls
		# (patterns, ls) = lift patterns ls
		= (AlgebraicPatterns type patterns, ls)
	lift (BasicPatterns type patterns) ls
		# (patterns, ls) = lift patterns ls
		= (BasicPatterns type patterns, ls)
	lift (OverloadedListPatterns type decons_expr patterns) ls
		# (patterns, ls) = lift patterns ls
		# (decons_expr, ls) = lift decons_expr ls
		= (OverloadedListPatterns type decons_expr patterns, ls)
	lift (NewTypePatterns type patterns) ls
		# (patterns, ls) = lift patterns ls
		= (NewTypePatterns type patterns, ls)
	lift (DynamicPatterns patterns) ls
		# (patterns, ls) = lift patterns ls
		= (DynamicPatterns patterns, ls)

instance lift AlgebraicPattern
where
	lift pattern=:{ap_expr} ls
		# (ap_expr, ls) = lift ap_expr ls
		= ({ pattern & ap_expr = ap_expr }, ls)

instance lift BasicPattern
where
	lift pattern=:{bp_expr} ls
		# (bp_expr, ls) = lift bp_expr ls
		= ({ pattern & bp_expr = bp_expr }, ls)

instance lift DynamicPattern
where
	lift pattern=:{dp_rhs} ls
		# (dp_rhs, ls) = lift dp_rhs ls
		= ({ pattern & dp_rhs = dp_rhs }, ls)

instance lift DynamicExpr
where
	lift dyn=:{dyn_expr} ls
		# (dyn_expr, ls) = lift dyn_expr ls
		= ({ dyn & dyn_expr = dyn_expr}, ls)

liftFunctions :: [FunctionOrMacroIndex] Int Int *{#FunDef} *{#*{#FunDef}} *VarHeap *ExpressionHeap -> .LiftState;
liftFunctions group group_index main_dcl_module_n fun_defs macro_defs var_heap expr_heap
	# (contains_free_vars, lifted_function_called, fun_defs,macro_defs)
			= foldSt (add_free_vars_of_non_recursive_calls_to_function group_index) group (False, False, fun_defs,macro_defs)
	| contains_free_vars
		# (fun_defs,macro_defs) = iterateSt (add_free_vars_of_recursive_calls_to_functions group_index group) (fun_defs,macro_defs)
		= lift_functions group {ls_x={x_fun_defs=fun_defs,x_macro_defs=macro_defs,x_main_dcl_module_n=main_dcl_module_n},ls_var_heap=var_heap,ls_expr_heap=expr_heap}
	| lifted_function_called
		= lift_functions group {ls_x={x_fun_defs=fun_defs,x_macro_defs=macro_defs,x_main_dcl_module_n=main_dcl_module_n},ls_var_heap=var_heap,ls_expr_heap=expr_heap}
		= {ls_x={x_fun_defs=fun_defs,x_macro_defs=macro_defs,x_main_dcl_module_n=main_dcl_module_n},ls_var_heap=var_heap, ls_expr_heap=expr_heap}
where
	add_free_vars_of_non_recursive_calls_to_function group_index (FunctionOrIclMacroIndex fun) (contains_free_vars, lifted_function_called, fun_defs,macro_defs)
		# (fun_def=:{fun_info}, fun_defs) = fun_defs![fun]
		  { fi_free_vars,fi_def_level,fi_calls } = fun_info
		  (lifted_function_called, fi_free_vars, fun_defs,macro_defs)
				= add_free_vars_of_non_recursive_calls fi_def_level group_index fi_calls lifted_function_called fi_free_vars fun_defs macro_defs
		= (contains_free_vars || not (isEmpty fi_free_vars), lifted_function_called, 
			{ fun_defs & [fun] = { fun_def & fun_info = { fun_info & fi_free_vars = fi_free_vars }}},macro_defs)
	add_free_vars_of_non_recursive_calls_to_function group_index (DclMacroIndex macro_module_index macro_index) (contains_free_vars, lifted_function_called, fun_defs,macro_defs)
		# (fun_def=:{fun_info}, macro_defs) = macro_defs![macro_module_index,macro_index]
		  { fi_free_vars,fi_def_level,fi_calls } = fun_info
		  (lifted_function_called, fi_free_vars, fun_defs,macro_defs)
		  		= add_free_vars_of_non_recursive_calls fi_def_level group_index fi_calls lifted_function_called fi_free_vars fun_defs macro_defs
		= (contains_free_vars || not (isEmpty fi_free_vars), lifted_function_called, 
			fun_defs,{ macro_defs & [macro_module_index,macro_index] = { fun_def & fun_info = { fun_info & fi_free_vars = fi_free_vars }}})

	add_free_vars_of_non_recursive_calls fi_def_level group_index fi_calls lifted_function_called fi_free_vars fun_defs macro_defs
		= foldSt (add_free_vars_of_non_recursive_call fi_def_level group_index) fi_calls (lifted_function_called, fi_free_vars, fun_defs,macro_defs)
	where
		add_free_vars_of_non_recursive_call fun_def_level group_index (FunCall fc_index _) (lifted_function_called, free_vars, fun_defs,macro_defs)
			# ({fun_info = {fi_free_vars,fi_group_index}}, fun_defs) = fun_defs![fc_index]
			| (if (fi_group_index>=NoIndex) (fi_group_index==group_index) (-2-fi_group_index==group_index)) || (isEmpty fi_free_vars)
				= (lifted_function_called, free_vars, fun_defs,macro_defs)
				# (free_vars_added, free_vars) = add_free_variables fun_def_level fi_free_vars (False, free_vars)
				= (True, free_vars, fun_defs,macro_defs)
		add_free_vars_of_non_recursive_call fun_def_level group_index (MacroCall macro_module_index fc_index _) (lifted_function_called, free_vars, fun_defs,macro_defs)
			# ({fun_info = {fi_free_vars,fi_group_index}}, macro_defs) = macro_defs![macro_module_index,fc_index]
			| (if (fi_group_index>=NoIndex) (fi_group_index==group_index) (-2-fi_group_index==group_index)) || (isEmpty fi_free_vars)
				= (lifted_function_called, free_vars, fun_defs,macro_defs)
				# (free_vars_added, free_vars) = add_free_variables fun_def_level fi_free_vars (False, free_vars)
				= (True, free_vars, fun_defs,macro_defs)
		add_free_vars_of_non_recursive_call fun_def_level group_index (DclFunCall _ _) (lifted_function_called, free_vars, fun_defs,macro_defs)
			= (lifted_function_called, free_vars, fun_defs,macro_defs)

	add_free_vars_of_recursive_calls_to_functions group_index group (fun_defs,macro_defs)
		= foldSt (add_free_vars_of_recursive_calls_to_function group_index) group (False, (fun_defs,macro_defs))

	add_free_vars_of_recursive_calls_to_function group_index (FunctionOrIclMacroIndex fun) (free_vars_added, (fun_defs,macro_defs))
		# (fun_def=:{fun_info}, fun_defs) = fun_defs![fun]
		  { fi_free_vars,fi_def_level,fi_calls } = fun_info
		  (free_vars_added, fi_free_vars, fun_defs,macro_defs)
				= foldSt (add_free_vars_of_recursive_call fi_def_level group_index) fi_calls (free_vars_added, fi_free_vars, fun_defs,macro_defs)
		  fun_defs = { fun_defs & [fun] = { fun_def & fun_info = { fun_info & fi_free_vars = fi_free_vars }}}
		= (free_vars_added, (fun_defs,macro_defs))
	add_free_vars_of_recursive_calls_to_function group_index (DclMacroIndex module_index fun) (free_vars_added, (fun_defs,macro_defs))
		# (fun_def=:{fun_info}, macro_defs) = macro_defs![module_index,fun]
		  { fi_free_vars,fi_def_level,fi_calls } = fun_info
		  (free_vars_added, fi_free_vars, fun_defs,macro_defs)
				= foldSt (add_free_vars_of_recursive_call fi_def_level group_index) fi_calls (free_vars_added, fi_free_vars, fun_defs,macro_defs)
		  macro_defs = { macro_defs & [module_index,fun] = { fun_def & fun_info = { fun_info & fi_free_vars = fi_free_vars }}}
		= (free_vars_added, (fun_defs,macro_defs))

	add_free_vars_of_recursive_call fun_def_level group_index (FunCall fc_index _) (free_vars_added, free_vars, fun_defs,macro_defs)
		# ({fun_info = {fi_free_vars,fi_group_index}}, fun_defs) = fun_defs![fc_index]
		| if (fi_group_index>=NoIndex) (fi_group_index==group_index) (-2-fi_group_index==group_index)
			# (free_vars_added, free_vars) = add_free_variables fun_def_level fi_free_vars (free_vars_added, free_vars)
			= (free_vars_added, free_vars, fun_defs,macro_defs)
			= (free_vars_added, free_vars, fun_defs,macro_defs)
	add_free_vars_of_recursive_call fun_def_level group_index (MacroCall module_index fc_index _) (free_vars_added, free_vars, fun_defs,macro_defs)
		# ({fun_info = {fi_free_vars,fi_group_index}}, macro_defs) = macro_defs![module_index,fc_index]
		| if (fi_group_index>=NoIndex) (fi_group_index==group_index) (-2-fi_group_index==group_index)
			# (free_vars_added, free_vars) = add_free_variables fun_def_level fi_free_vars (free_vars_added, free_vars)
			= (free_vars_added, free_vars, fun_defs,macro_defs)
			= (free_vars_added, free_vars, fun_defs,macro_defs)
	add_free_vars_of_recursive_call fun_def_level group_index (DclFunCall _ _) (free_vars_added, free_vars, fun_defs,macro_defs)
		= (free_vars_added, free_vars, fun_defs,macro_defs)

	add_free_variables fun_level new_vars (free_vars_added, free_vars)
		= add_free_global_variables (skip_local_variables fun_level new_vars) (free_vars_added, free_vars)
	where
		skip_local_variables level vars=:[{fv_def_level}:rest_vars]
			| fv_def_level > level
				= skip_local_variables level rest_vars
				= vars
		skip_local_variables _ []
			= []

		add_free_global_variables []  (free_vars_added, free_vars)
			= (free_vars_added, free_vars)
		add_free_global_variables free_vars (free_vars_added, [])
			= (True, free_vars)
		add_free_global_variables [var:vars] (free_vars_added, free_vars)
			# (free_var_added, free_vars) = newFreeVariable var free_vars
			= add_free_global_variables vars (free_var_added || free_vars_added, free_vars)

	lift_functions group lift_state
		= foldSt lift_function group lift_state
	where
		lift_function (FunctionOrIclMacroIndex fun) {ls_x=ls_x=:{x_fun_defs=fun_defs=:{[fun] = fun_def}}, ls_var_heap=var_heap, ls_expr_heap=expr_heap}
			# {fi_free_vars} = fun_def.fun_info
			  fun_lifted = length fi_free_vars
			  (PartitioningFunction {cb_args,cb_rhs} fun_number) = fun_def.fun_body
			  (cb_args, var_heap) = add_lifted_args fi_free_vars cb_args var_heap
			  (cb_rhs, {ls_x,ls_var_heap,ls_expr_heap}) = lift cb_rhs { ls_x={ls_x & x_fun_defs = fun_defs}, ls_var_heap = var_heap, ls_expr_heap = expr_heap }
			  ls_var_heap = remove_lifted_args fi_free_vars ls_var_heap
			  fun_defs = ls_x.x_fun_defs
			  fun_defs = { fun_defs & [fun] = { fun_def & fun_lifted = fun_lifted, fun_body = PartitioningFunction {cb_args = cb_args, cb_rhs = cb_rhs} fun_number}}
			= {ls_x={ls_x & x_fun_defs=fun_defs}, ls_var_heap=ls_var_heap, ls_expr_heap= ls_expr_heap}
		lift_function (DclMacroIndex module_index fun) {ls_x=ls_x=:{x_macro_defs=macro_defs=:{[module_index,fun] = fun_def}}, ls_var_heap=var_heap, ls_expr_heap=expr_heap}
			# {fi_free_vars} = fun_def.fun_info
			  fun_lifted = length fi_free_vars
			  (PartitioningFunction {cb_args,cb_rhs} fun_number) = fun_def.fun_body
			  (cb_args, var_heap) = add_lifted_args fi_free_vars cb_args var_heap
			  (cb_rhs, {ls_x,ls_var_heap,ls_expr_heap}) = lift cb_rhs { ls_x={ls_x & x_macro_defs = macro_defs}, ls_var_heap = var_heap, ls_expr_heap = expr_heap }
			  ls_var_heap = remove_lifted_args fi_free_vars ls_var_heap
			  macro_defs = ls_x.x_macro_defs
			  macro_defs = { macro_defs & [module_index].[fun] = { fun_def & fun_lifted = fun_lifted, fun_body = PartitioningFunction {cb_args = cb_args, cb_rhs = cb_rhs} fun_number}}
			= {ls_x={ls_x & x_macro_defs=macro_defs}, ls_var_heap=ls_var_heap, ls_expr_heap= ls_expr_heap}

		remove_lifted_args vars var_heap
			= foldl (\var_heap {fv_ident,fv_info_ptr} -> writePtr fv_info_ptr VI_Empty var_heap) var_heap vars
	
		add_lifted_args [lifted_arg=:{fv_ident,fv_info_ptr} : lifted_args] args var_heap
			# (new_info_ptr, var_heap) = newPtr VI_Empty var_heap
			  args = [{ lifted_arg & fv_info_ptr = new_info_ptr } : args ]
			= add_lifted_args lifted_args args (writePtr fv_info_ptr (VI_LiftedVariable new_info_ptr) var_heap)
		add_lifted_args [] args var_heap
			= (args, var_heap)

unfoldVariable :: !BoundVar !*UnfoldState -> (!Expression, !*UnfoldState)
unfoldVariable var=:{var_info_ptr} us
	# (var_info, us) = readVarInfo var_info_ptr us
	= case var_info of
		VI_Expression expr
			-> (expr, us)
		VI_Variable var_ident var_info_ptr
		 	# (var_expr_ptr, us_symbol_heap) = newPtr EI_Empty us.us_symbol_heap
			-> (Var {var_ident = var_ident, var_info_ptr = var_info_ptr, var_expr_ptr = var_expr_ptr}, { us & us_symbol_heap = us_symbol_heap})
		_
			-> (Var var, us)

readVarInfo var_info_ptr us
	# (var_info, us_var_heap) = readPtr var_info_ptr us.us_var_heap
	  us = { us & us_var_heap = us_var_heap }
	= case var_info of
		VI_Extended _ original	-> (original, us)
		_						-> (var_info, us)

::	CopiedLocalFunction = {
		old_function_n :: !FunctionOrMacroIndex,
		new_function_n :: !Int
	}

::	CopiedLocalFunctions = {
		copied_local_functions :: [CopiedLocalFunction],
		used_copied_local_functions :: [CopiedLocalFunction],
		new_copied_local_functions :: [CopiedLocalFunction],
		next_local_function_n :: !Int
	}

::	UnfoldState =
	{	us_var_heap				:: !.VarHeap
	,	us_symbol_heap			:: !.ExpressionHeap
	,	us_local_macro_functions :: !Optional CopiedLocalFunctions
	}

class unfold a :: !a !*UnfoldState -> (!a, !*UnfoldState)

instance unfold Expression
where
	unfold (Var var) us
		= unfoldVariable var us
	unfold (App app) us
		# (app, us) = unfold app us
		= (App app, us)
	unfold (expr @ exprs) us
		# ((expr,exprs), us) = unfold (expr,exprs) us
		= (expr @ exprs, us)
	unfold (Let lad) us
		# (lad, us) = unfold lad us
		= (Let lad, us)
	unfold (Case case_expr) us
		# (case_expr, us) = unfold case_expr us
		= (Case case_expr, us)
	unfold (Selection selector_kind expr selectors) us
		# ((expr, selectors), us) = unfold (expr, selectors) us
		= (Selection selector_kind expr selectors, us)
	unfold (Update expr1 selectors expr2) us
		# (((expr1, expr2), selectors), us) = unfold ((expr1, expr2), selectors) us
		= (Update expr1 selectors expr2, us)
	unfold (RecordUpdate cons_symbol expression expressions) us
		# ((expression, expressions), us) = unfold (expression, expressions) us
		= (RecordUpdate cons_symbol expression expressions, us)
	unfold (TupleSelect symbol argn_nr expr) us
		# (expr, us) = unfold expr us
		= (TupleSelect symbol argn_nr expr, us)
	unfold (MatchExpr cons_ident expr) us
		# (expr, us) = unfold expr us
		= (MatchExpr cons_ident expr, us)
	unfold (IsConstructor expr cons_symbol cons_arity global_type_index case_ident position) us
		# (expr, us) = unfold expr us
		= (IsConstructor expr cons_symbol cons_arity global_type_index case_ident position, us)
	unfold (DynamicExpr expr) us
		# (expr, us) = unfold expr us
		= (DynamicExpr expr, us)
	unfold (TypeSignature type_function expr) us
		# (expr, us) = unfold expr us
		= (TypeSignature type_function expr, us)
	unfold expr us
		= (expr, us)

instance unfold DynamicExpr
where
	unfold expr=:{dyn_expr, dyn_info_ptr} us=:{us_symbol_heap}
		# (dyn_info, us_symbol_heap) = readPtr dyn_info_ptr us_symbol_heap
		# (new_dyn_info_ptr, us_symbol_heap) = newPtr dyn_info us_symbol_heap
		# (dyn_expr, us) = unfold dyn_expr {us & us_symbol_heap=us_symbol_heap}
		= ({ expr & dyn_expr = dyn_expr, dyn_info_ptr = new_dyn_info_ptr }, us)

instance unfold Selection
where
	unfold (ArraySelection array_select expr_ptr index_expr) us=:{us_symbol_heap}
		# (new_ptr, us_symbol_heap) = newPtr EI_Empty us_symbol_heap
		  (index_expr, us) = unfold index_expr { us & us_symbol_heap = us_symbol_heap}
		= (ArraySelection array_select new_ptr index_expr, us)
	unfold (DictionarySelection var selectors expr_ptr index_expr) us=:{us_symbol_heap}
		# (new_ptr, us_symbol_heap) = newPtr EI_Empty us_symbol_heap
		  (index_expr, us) = unfold index_expr { us & us_symbol_heap = us_symbol_heap}
		  (var_expr, us) = unfoldVariable var us
		= case var_expr of 
			App {app_symb={symb_kind= SK_Constructor _ }, app_args}
				# [RecordSelection _ field_index:_] = selectors
				  (App { app_symb = {symb_ident, symb_kind = SK_Function array_select}}) =  app_args !! field_index
				-> (ArraySelection { array_select & glob_object = { ds_ident = symb_ident, ds_arity = 2, ds_index = array_select.glob_object}}
							new_ptr index_expr, us)
			Var var
				-> (DictionarySelection var selectors new_ptr index_expr, us)
	unfold record_selection us
		= (record_selection, us)

instance unfold FreeVar
where
	unfold fv=:{fv_info_ptr,fv_ident} us=:{us_var_heap}
		# (new_info_ptr, us_var_heap) = newPtr VI_Empty us_var_heap
		= ({ fv & fv_info_ptr = new_info_ptr }, { us & us_var_heap = writePtr fv_info_ptr (VI_Variable fv_ident new_info_ptr) us_var_heap })

instance unfold App
where
	unfold app=:{app_symb={symb_kind}, app_args, app_info_ptr} us
		= case symb_kind of
			SK_Function {glob_module,glob_object}
				-> unfold_function_app app us
			SK_IclMacro macro_index
				-> unfold_function_app app us
			SK_DclMacro {glob_module,glob_object}
				-> unfold_function_app app us
			SK_OverloadedFunction {glob_module,glob_object}
				-> unfold_function_app app us
			SK_Generic {glob_module,glob_object} kind
				-> unfold_function_app app us
			SK_LocalMacroFunction local_macro_function_n
				-> unfold_local_macro_function (FunctionOrIclMacroIndex local_macro_function_n)
			SK_LocalDclMacroFunction {glob_module,glob_object}
				-> unfold_local_macro_function (DclMacroIndex glob_module glob_object)
			SK_Constructor _
				| not (isNilPtr app_info_ptr)
					# (app_info, us_symbol_heap) = readPtr app_info_ptr us.us_symbol_heap
					  new_app_info = app_info
					  (new_info_ptr, us_symbol_heap) = newPtr new_app_info us_symbol_heap
					  us={ us & us_symbol_heap = us_symbol_heap }
					  (app_args, us) = unfold app_args us
					-> ({ app & app_args = app_args, app_info_ptr = new_info_ptr}, us) 
					# (app_args, us) = unfold app_args us
					-> ({ app & app_args = app_args}, us)
			_
				# (app_args, us) = unfold app_args us
				-> ({ app & app_args = app_args, app_info_ptr = nilPtr}, us) 
	where
		unfold_function_app app=:{app_args, app_info_ptr} us
			# (new_info_ptr, us_symbol_heap) = newPtr EI_Empty us.us_symbol_heap
			# us={ us & us_symbol_heap = us_symbol_heap }
			# (app_args, us) = unfold app_args us
			= ({ app & app_args = app_args, app_info_ptr = new_info_ptr}, us) 

		unfold_local_macro_function local_macro_function_n
			# (us_local_macro_functions,us) = us!us_local_macro_functions
			= case us_local_macro_functions of
				No
					-> unfold_function_app app us
				uslocal_macro_functions=:(Yes local_macro_functions)
					# (new_local_macro_function_n,us_local_macro_functions) = determine_new_local_macro_function_n local_macro_function_n local_macro_functions
						with
							determine_new_local_macro_function_n local_macro_function_n local_macro_functions=:{copied_local_functions,used_copied_local_functions,new_copied_local_functions,next_local_function_n}
								# new_local_macro_function_n = search_new_local_macro_function_n used_copied_local_functions
								| new_local_macro_function_n>=0
									= (new_local_macro_function_n,us_local_macro_functions)
								# (new_local_macro_function_n,used_copied_local_functions) = search_new_local_macro_function_n_and_add_to_used_functions copied_local_functions used_copied_local_functions
								| new_local_macro_function_n>=0
									= (new_local_macro_function_n,Yes {local_macro_functions & used_copied_local_functions=used_copied_local_functions})
								# (new_local_macro_function_n,used_copied_local_functions) = search_new_local_macro_function_n_and_add_to_used_functions new_copied_local_functions used_copied_local_functions
								| new_local_macro_function_n>=0
									= (new_local_macro_function_n,Yes {local_macro_functions & used_copied_local_functions=used_copied_local_functions})
									# new_local_function = {old_function_n=local_macro_function_n,new_function_n=next_local_function_n}
									# new_copied_local_functions=new_copied_local_functions++[new_local_function]
									# us_local_macro_functions=Yes {copied_local_functions=copied_local_functions,
																	new_copied_local_functions=new_copied_local_functions,
																	used_copied_local_functions=[new_local_function:used_copied_local_functions],
																	next_local_function_n=next_local_function_n+1}
									= (next_local_function_n,us_local_macro_functions)
								where
									search_new_local_macro_function_n [{old_function_n,new_function_n}:local_functions]
										| local_macro_function_n==old_function_n
											= new_function_n
										 	= search_new_local_macro_function_n local_functions
									search_new_local_macro_function_n []
										= -1

									search_new_local_macro_function_n_and_add_to_used_functions [copied_local_function=:{old_function_n,new_function_n}:local_functions] used_copied_local_functions
										| local_macro_function_n==old_function_n
											= (new_function_n,[copied_local_function:used_copied_local_functions])
										 	= search_new_local_macro_function_n_and_add_to_used_functions local_functions used_copied_local_functions
									search_new_local_macro_function_n_and_add_to_used_functions [] used_copied_local_functions
										= (-1,used_copied_local_functions)
					# us={us & us_local_macro_functions=us_local_macro_functions}
					# app={app & app_symb.symb_kind=SK_LocalMacroFunction new_local_macro_function_n}
					-> unfold_function_app app us

instance unfold LetBind
where
	unfold bind=:{lb_src} us
		# (lb_src, us) = unfold lb_src us
		= ({ bind & lb_src = lb_src }, us)

instance unfold (Bind a b) | unfold a
where
	unfold bind=:{bind_src} us
		# (bind_src, us) = unfold bind_src us
		= ({ bind & bind_src = bind_src }, us)

instance unfold Case
where
	unfold kees=:{case_expr,case_guards,case_default,case_info_ptr} us
		# (old_case_info, us_symbol_heap) = readPtr case_info_ptr us.us_symbol_heap
		  new_case_info = old_case_info
		  (new_info_ptr, us_symbol_heap) = newPtr new_case_info us_symbol_heap
		  us = { us & us_symbol_heap = us_symbol_heap }
		  ((case_guards,case_default), us) = unfold (case_guards,case_default) us
		  (case_expr, us) = unfold case_expr us
		= ({ kees & case_expr = case_expr,case_guards = case_guards, case_default = case_default, case_info_ptr =  new_info_ptr}, us)

instance unfold Let
where
	unfold lad=:{let_strict_binds, let_lazy_binds, let_expr, let_info_ptr} us
		# (let_strict_binds, us) = copy_bound_vars let_strict_binds us
		# (let_lazy_binds, us) = copy_bound_vars let_lazy_binds us
		# (let_strict_binds, us) = unfold let_strict_binds us
		# (let_lazy_binds, us) = unfold let_lazy_binds us
		# (let_expr, us) = unfold let_expr us
		  (old_let_info, us_symbol_heap) = readPtr let_info_ptr us.us_symbol_heap
		  new_let_info = old_let_info
		  (new_info_ptr, us_symbol_heap) = newPtr new_let_info us_symbol_heap
		= ({lad & let_strict_binds = let_strict_binds, let_lazy_binds = let_lazy_binds, let_expr = let_expr, let_info_ptr = new_info_ptr},
			{ us & us_symbol_heap = us_symbol_heap })
		where
			copy_bound_vars [bind=:{lb_dst} : binds] us
				# (lb_dst, us) = unfold lb_dst us
				  (binds, us) = copy_bound_vars binds us
				= ([ {bind & lb_dst = lb_dst} : binds ], us)
			copy_bound_vars [] us
				= ([], us)

instance unfold CasePatterns
where
	unfold (AlgebraicPatterns type patterns) us
		# (patterns, us) = unfold patterns us
		= (AlgebraicPatterns type patterns, us)
	unfold (BasicPatterns type patterns) us
		# (patterns, us) = unfold patterns us
		= (BasicPatterns type patterns, us)
	unfold (OverloadedListPatterns type decons_expr patterns) us
		# (patterns, us) = unfold patterns us
		# (decons_expr, us) = unfold decons_expr us
		= (OverloadedListPatterns type decons_expr patterns, us)
	unfold (NewTypePatterns type patterns) us
		# (patterns, us) = unfold patterns us
		= (NewTypePatterns type patterns, us)
	unfold (DynamicPatterns patterns) us
		# (patterns, us) = unfold patterns us
		= (DynamicPatterns patterns, us)

instance unfold AlgebraicPattern
where
	unfold guard=:{ap_vars,ap_expr} us
		# (ap_vars, us) = unfold ap_vars us
		  (ap_expr, us) = unfold ap_expr us
		= ({ guard & ap_vars = ap_vars, ap_expr = ap_expr }, us)

instance unfold BasicPattern
where
	unfold guard=:{bp_expr} us
		# (bp_expr, us) = unfold bp_expr us
		= ({ guard & bp_expr = bp_expr }, us)

instance unfold DynamicPattern
where
	unfold guard=:{dp_var,dp_rhs} us
		# (dp_var, us) = unfold dp_var us
		  (dp_rhs, us) = unfold dp_rhs us
		= ({ guard & dp_var = dp_var, dp_rhs = dp_rhs }, us)

instance unfold [a] | unfold a
where
	unfold l us
		= map_st l us
		where
			map_st [x : xs] s
			 	# (x, s) = unfold x s
				  (xs, s) = map_st xs s
				#! s = s
				= ([x : xs], s)
			map_st [] s
			 	= ([], s)

instance unfold (a,b) | unfold a & unfold b
where
	unfold (a,b) us
		# (a,us) = unfold a us
		# (b,us) = unfold b us
		= ((a,b),us)

instance unfold (Optional a) | unfold a
where
	unfold (Yes x) us
		# (x, us) = unfold x us
		= (Yes x, us)
	unfold no us
		= (no, us)

updateFunctionCalls :: ![FunCall] ![FunCall] !*{# FunDef} !*SymbolTable
	-> (![FunCall], !*{# FunDef}, !*SymbolTable)
updateFunctionCalls calls collected_calls fun_defs symbol_table
	= foldSt add_function_call calls (collected_calls, fun_defs, symbol_table)
where
	add_function_call fc=:(FunCall fc_index _) (collected_calls, fun_defs, symbol_table)
//		# fc_index = trace_n ("add_function_call: "+++toString fc_index+++" ") fc_index
		# ({fun_ident}, fun_defs) = fun_defs![fc_index]
		  (collected_calls, symbol_table) = examineFunctionCall fun_ident fc (collected_calls, symbol_table) 
		= (collected_calls, fun_defs, symbol_table)

examineFunctionCall {id_info} fc=:(FunCall fc_index _) (calls, symbol_table)
	# (entry, symbol_table) = readPtr id_info symbol_table
	= case entry.ste_kind of
		STE_Called indexes
			| is_member fc_index indexes
				-> (calls, symbol_table)
				-> ([ fc : calls ], symbol_table <:= (id_info, { entry & ste_kind = STE_Called [ FunctionOrIclMacroIndex fc_index : indexes ]}))
		_
			-> ( [ fc : calls ], symbol_table <:=
					(id_info, { ste_kind = STE_Called [FunctionOrIclMacroIndex fc_index], ste_index = NoIndex, ste_def_level = NotALevel, ste_previous = entry }))
	where
		is_member fc_index [FunctionOrIclMacroIndex index:indexes]
			| fc_index==index
				= True
				= is_member fc_index indexes
		is_member fc_index [_:indexes]
			= is_member fc_index indexes
		is_member _ []
			= False
examineFunctionCall {id_info} fc=:(MacroCall macro_module_index fc_index _) (calls, symbol_table)
	# (entry, symbol_table) = readPtr id_info symbol_table
	= case entry.ste_kind of
		STE_Called indexes
			| is_member macro_module_index fc_index indexes
				-> (calls, symbol_table)
				-> ([ fc : calls ], symbol_table <:= (id_info, { entry & ste_kind = STE_Called [ DclMacroIndex macro_module_index fc_index : indexes ]}))
		_
			-> ( [ fc : calls ], symbol_table <:=
					(id_info, { ste_kind = STE_Called [DclMacroIndex macro_module_index fc_index], ste_index = NoIndex, ste_def_level = NotALevel, ste_previous = entry }))
	where
		is_member macro_module_index fc_index [DclMacroIndex module_index index:indexes]
			| fc_index==index && module_index==macro_module_index
				= True
				= is_member macro_module_index fc_index indexes
		is_member macro_module_index fc_index [_:indexes]
			= is_member macro_module_index fc_index indexes
		is_member _ _ []
			= False

::	ExpandState = {
		es_symbol_table		:: !.SymbolTable,
		es_var_heap			:: !.VarHeap,
		es_expression_heap 	:: !.ExpressionHeap,
		es_error 			:: !.ErrorAdmin,
		es_fun_defs			:: !.{#FunDef},
		es_macro_defs		:: !.{#.{#FunDef}},
		es_new_fun_def_numbers :: ![Int]
	}

copy_macro_and_local_functions :: FunDef (Optional CopiedLocalFunctions) *ExpandState -> (!FunDef,![(CopiedLocalFunction,FunDef)],!Optional CopiedLocalFunctions,!*ExpandState);
copy_macro_and_local_functions macro=:{fun_kind} local_macro_functions es
	# (macro,local_macro_functions,es) = copy_macro_or_local_macro_function macro local_macro_functions es
	# (new_functions,local_macro_functions,es) = copy_local_functions_of_macro local_macro_functions [] es
	= (macro,new_functions,local_macro_functions,es)

copy_local_functions_of_macro :: (Optional CopiedLocalFunctions) [CopiedLocalFunction] *ExpandState -> (![(CopiedLocalFunction,FunDef)],!Optional CopiedLocalFunctions,!*ExpandState);
copy_local_functions_of_macro local_macro_functions local_functions_to_be_copied es
	# (local_functions_to_be_copied,local_macro_functions) = add_new_local_functions_to_be_copied local_functions_to_be_copied local_macro_functions
		with
			add_new_local_functions_to_be_copied local_functions_to_be_copied local_macro_functions=:(Yes copied_local_macro_functions=:{new_copied_local_functions=[]})
				= (local_functions_to_be_copied,Yes {copied_local_macro_functions & used_copied_local_functions=[]})
			add_new_local_functions_to_be_copied local_functions_to_be_copied (Yes {copied_local_functions,new_copied_local_functions,next_local_function_n})
				# local_macro_functions=Yes {copied_local_functions=copied_local_functions++new_copied_local_functions,
											new_copied_local_functions=[],used_copied_local_functions=[],next_local_function_n=next_local_function_n}
				= (local_functions_to_be_copied++new_copied_local_functions,local_macro_functions)
	= case local_functions_to_be_copied of
		[]
			-> ([],local_macro_functions,es)
		[(old_and_new_function_n=:{old_function_n,new_function_n}):local_functions_to_be_copied]
			# (function,es)
				= case old_function_n of
					FunctionOrIclMacroIndex old_function_index
						# (function,es)=es!es_fun_defs.[old_function_index]			
						#! function_group_index=function.fun_info.fi_group_index
						# es = {es & es_fun_defs.[old_function_index].fun_info.fi_group_index= if (function_group_index>NoIndex) (-2-function_group_index) function_group_index}
						# function = {function & fun_info.fi_group_index=if (function_group_index<NoIndex) (-2-function_group_index) function_group_index}
						-> (function,es)
					DclMacroIndex old_function_module_index old_function_index
						# (function,es)=es!es_macro_defs.[old_function_module_index,old_function_index]			
						#! function_group_index=function.fun_info.fi_group_index
						# es = {es & es_macro_defs.[old_function_module_index].[old_function_index].fun_info.fi_group_index= if (function_group_index>NoIndex) (-2-function_group_index) function_group_index}
						# function = {function & fun_info.fi_group_index=if (function_group_index<NoIndex) (-2-function_group_index) function_group_index}
						-> (function,es)
			# (function,local_macro_functions,es) = copy_macro_or_local_macro_function function local_macro_functions es
			# (new_functions,local_macro_functions,es) = copy_local_functions_of_macro local_macro_functions local_functions_to_be_copied es
			-> ([(old_and_new_function_n,function):new_functions],local_macro_functions,es)

update_calls calls No
	= calls
update_calls calls (Yes {used_copied_local_functions=[]})
	= calls
update_calls calls (Yes {used_copied_local_functions})
	# calls = remove_old_calls calls
	= add_new_calls used_copied_local_functions calls
where
	remove_old_calls [call=:(FunCall fc_index _):calls]
		| contains_old_function_n used_copied_local_functions
//			# calls = trace ("remove_old_calls1: "+++toString fc_index) calls
			= remove_old_calls calls
//			# calls = trace ("remove_old_calls2: "+++toString fc_index) calls
			= [call:remove_old_calls calls]
	where
		contains_old_function_n [{old_function_n=FunctionOrIclMacroIndex old_function_index }:local_functions]
			= fc_index==old_function_index || contains_old_function_n local_functions
		contains_old_function_n [_:local_functions]
			= contains_old_function_n local_functions
		contains_old_function_n []
			= False
	remove_old_calls [call=:(MacroCall macro_module_index fc_index _):calls]
		| contains_old_function_n used_copied_local_functions
			= remove_old_calls calls
			= [call:remove_old_calls calls]
	where
		contains_old_function_n [{old_function_n=DclMacroIndex old_macro_module_index old_function_index }:local_functions]
			= fc_index==old_function_index && macro_module_index==old_macro_module_index || contains_old_function_n local_functions
		contains_old_function_n [_:local_functions]
			= contains_old_function_n local_functions
		contains_old_function_n []
			= False
	remove_old_calls [call=:(DclFunCall _ _):calls]
			= [call:remove_old_calls calls]
	remove_old_calls []
		= []
	
	add_new_calls [{new_function_n}:local_functions] calls
//		# local_functions = trace ("add_new_calls: "+++toString new_function_n) local_functions
		= add_new_calls local_functions [FunCall new_function_n NotALevel:calls]
	add_new_calls [] calls
		= calls

copy_macro_or_local_macro_function :: !FunDef !(Optional CopiedLocalFunctions) !*ExpandState -> (!FunDef,!Optional CopiedLocalFunctions,!.ExpandState);
copy_macro_or_local_macro_function macro=:{fun_body = TransformedBody {tb_args,tb_rhs},fun_kind,fun_info={fi_local_vars,fi_calls}} local_macro_functions es=:{es_var_heap,es_expression_heap}
	# (tb_args,es_var_heap) = create_new_arguments tb_args es_var_heap
		with
			create_new_arguments [var=:{fv_ident,fv_info_ptr} : vars] var_heap
				# (new_vars,var_heap) = create_new_arguments vars var_heap
				# (new_info, var_heap) = newPtr VI_Empty var_heap
				# new_var = { fv_ident = fv_ident, fv_def_level = NotALevel, fv_info_ptr = new_info, fv_count = 0 }
				= ([new_var : new_vars], writePtr fv_info_ptr (VI_Variable fv_ident new_info) var_heap)
			create_new_arguments [] var_heap
				= ([],var_heap)
	# us = { us_symbol_heap = es_expression_heap, us_var_heap = es_var_heap, us_local_macro_functions = local_macro_functions }
	# (result_expr,{us_local_macro_functions,us_symbol_heap,us_var_heap}) = unfold tb_rhs us
	# (fi_local_vars,us_var_heap) = update_local_vars fi_local_vars us_var_heap
		with
			update_local_vars :: ![FreeVar] !*VarHeap -> (![FreeVar],!*VarHeap);
			update_local_vars [fv=:{fv_info_ptr}:fvs] var_heap
				# (fvs,var_heap)=update_local_vars fvs var_heap
				# (fv_info,var_heap) = readPtr fv_info_ptr var_heap
				# fv = {fv & fv_info_ptr=case fv_info of 
											(VI_Variable _ info_ptr) -> info_ptr
						}
				= ([fv:fvs],var_heap)
			update_local_vars [] var_heap
				= ([],var_heap)
	# fi_calls = update_calls fi_calls us_local_macro_functions
	= ({macro & fun_body = TransformedBody {tb_args=tb_args,tb_rhs=result_expr},fun_info.fi_local_vars=fi_local_vars,fun_info.fi_calls=fi_calls},us_local_macro_functions,
		{es & es_var_heap=us_var_heap, es_expression_heap=us_symbol_heap})

unfoldMacro :: !FunDef ![Expression] !*ExpandInfo -> (!Expression, !*ExpandInfo)
unfoldMacro {fun_body =fun_body=: TransformedBody {tb_args,tb_rhs}, fun_info = {fi_calls},fun_kind,fun_ident} args (calls, es=:{es_var_heap,es_expression_heap,es_fun_defs})
	# (let_binds, var_heap) = bind_expressions tb_args args [] es_var_heap
	#! size_fun_defs = size es_fun_defs
	# copied_local_functions = Yes { copied_local_functions=[],used_copied_local_functions=[],new_copied_local_functions=[],next_local_function_n=size_fun_defs}
	# us = { us_symbol_heap = es_expression_heap, us_var_heap = var_heap, us_local_macro_functions = copied_local_functions }
	# (result_expr,{us_local_macro_functions,us_symbol_heap,us_var_heap}) = unfold tb_rhs us
	# es = {es & es_var_heap = us_var_heap, es_expression_heap = us_symbol_heap}
	# fi_calls = update_calls fi_calls us_local_macro_functions
	# (new_functions,us_local_macro_functions,es) = copy_local_functions_of_macro us_local_macro_functions [] es
	# {es_expression_heap,es_symbol_table,es_fun_defs,es_new_fun_def_numbers} = es
	# (es_fun_defs,es_new_fun_def_numbers) = case new_functions of
		[]
			-> (es_fun_defs,es_new_fun_def_numbers)
		_
			# last_function_index = case us_local_macro_functions of (Yes {next_local_function_n}) -> next_local_function_n-1
			# new_fun_defs = new_fun_defs
				with
					new_fun_defs :: *{!FunDef}
					new_fun_defs => {fun_def \\ (_,fun_def)<-new_functions}
//			-> ({if (i<size_fun_defs) es_fun_defs.[i] new_fun_defs.[i-size_fun_defs] \\ i<-[0..last_function_index]} // inefficient
//				,[size_fun_defs:es_new_fun_def_numbers])
//			#! new_fun_defs = arrayConcat es_fun_defs new_fun_defs	// leads to backend crash!
			# new_fun_defs = arrayConcat es_fun_defs new_fun_defs
			-> (new_fun_defs, [size_fun_defs:es_new_fun_def_numbers])
	# (calls, fun_defs, es_symbol_table) = updateFunctionCalls fi_calls calls es_fun_defs es_symbol_table
	| isEmpty let_binds
		= (result_expr, (calls, { es & es_symbol_table = es_symbol_table, es_fun_defs=fun_defs,es_new_fun_def_numbers=es_new_fun_def_numbers }))
		# (new_info_ptr, es_expression_heap) = newPtr EI_Empty es_expression_heap
		# result_expr=Let { let_strict_binds = [], let_lazy_binds = let_binds, let_expr = result_expr, let_info_ptr = new_info_ptr, let_expr_position = NoPos }
		= (result_expr, (calls, { es & es_symbol_table = es_symbol_table, es_expression_heap=es_expression_heap, es_fun_defs=fun_defs,es_new_fun_def_numbers=es_new_fun_def_numbers }))
where
	bind_expressions [var : vars] [expr : exprs] binds var_heap
		# (binds, var_heap) = bind_expressions vars exprs binds var_heap
		= bind_expression var expr binds var_heap
	bind_expressions _ _ binds var_heap
		= (binds, var_heap)

	bind_expression :: FreeVar Expression [LetBind] *VarHeap -> (![LetBind],!*VarHeap);
	bind_expression {fv_count} expr binds var_heap
		| fv_count == 0
			= (binds, var_heap)
	bind_expression {fv_info_ptr} (Var {var_ident,var_info_ptr}) binds var_heap
		= (binds, writePtr fv_info_ptr (VI_Variable var_ident var_info_ptr) var_heap)
	bind_expression {fv_ident,fv_info_ptr,fv_count} expr binds var_heap
		| fv_count == 1
			= (binds, writePtr fv_info_ptr (VI_Expression expr) var_heap)
		# (new_info, var_heap) = newPtr VI_Empty var_heap
		  new_var = { fv_ident = fv_ident, fv_def_level = NotALevel, fv_info_ptr = new_info, fv_count = 0 }
		= ([{ lb_src = expr, lb_dst = new_var, lb_position = NoPos} : binds], writePtr fv_info_ptr (VI_Variable fv_ident new_info) var_heap)

::	PartitioningState =
	{	ps_symbol_table	:: !.SymbolTable
	,	ps_var_heap		:: !.VarHeap
	,	ps_symbol_heap	:: !.ExpressionHeap
	,	ps_error		:: !.ErrorAdmin
	,	ps_fun_defs		:: !.{#FunDef}
	,	ps_macro_defs	:: !.{#.{#FunDef}}
	,	ps_next_num		:: !Int
	,	ps_next_group	:: !Int
	,	ps_groups		:: ![[FunctionOrMacroIndex]]
	,	ps_deps			:: ![FunctionOrMacroIndex]
	,	ps_unexpanded_dcl_macros :: ![(Int,Int,FunDef)]
	}

:: PartitioningInfo = ! {
	pi_predef_symbols_for_transform :: !PredefSymbolsForTransform,
	pi_main_dcl_module_n :: !Int
   }

NotChecked :== -1	

:: PredefSymbolsForTransform = { predef_alias_dummy :: !PredefinedSymbol, predef_and :: !PredefinedSymbol, predef_or :: !PredefinedSymbol };

reset_body_of_rhs_macros ps_deps fun_defs macro_defs
	= foldSt reset_body_of_rhs_macro ps_deps (fun_defs,macro_defs)
	where
		reset_body_of_rhs_macro (FunctionOrIclMacroIndex macro_index) (fun_defs,macro_defs)
			# (macro_def,fun_defs) = fun_defs![macro_index]
			= case macro_def.fun_body of
				RhsMacroBody body
					-> ({ fun_defs & [macro_index] = { macro_def & fun_body = CheckedBody body }},macro_defs)
				_
					-> (fun_defs,macro_defs)
		reset_body_of_rhs_macro (DclMacroIndex module_index macro_index) (fun_defs,macro_defs)
			# (macro_def,macro_defs) = macro_defs![module_index,macro_index]
			= case macro_def.fun_body of
				RhsMacroBody body
					-> (fun_defs,{ macro_defs & [module_index,macro_index] = { macro_def & fun_body = CheckedBody body }})
				_
					-> (fun_defs,macro_defs)

expand_simple_macro mod_index macro=:{fun_body = CheckedBody body, fun_info, fun_ident, fun_pos,fun_kind}
		predef_symbols_for_transform ps=:{ps_symbol_table,ps_symbol_heap,ps_var_heap,ps_fun_defs,ps_macro_defs,ps_error}
  	# identPos = newPosition fun_ident fun_pos
	# es = { es_symbol_table = ps_symbol_table, es_var_heap = ps_var_heap,
			 es_expression_heap = ps_symbol_heap, es_error = setErrorAdmin identPos ps_error,
			 es_fun_defs=ps_fun_defs, es_macro_defs=ps_macro_defs, es_new_fun_def_numbers=[]
		   }
	# (tb_args, tb_rhs, local_vars, fi_calls, fi_dynamics,{es_symbol_table, es_var_heap, es_expression_heap, es_error,es_fun_defs,es_macro_defs})
			= expandMacrosInBody [] body fun_info.fi_dynamics predef_symbols_for_transform es
	# macro = { macro & fun_body = TransformedBody { tb_args = tb_args, tb_rhs = tb_rhs},
	  			fun_info = { fun_info & fi_calls = fi_calls, fi_local_vars = local_vars, fi_dynamics=fi_dynamics }}