statesgen.c 128 KB
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/*
	 (Concurrent) Clean Compiler:  Generation of states
	 ==================================================

	This module generates the (internal) states that are used during the code generation.

	Authors: Sjaak Smetsers & John van Groningen
	At:		 University of Nijmegen, department of computing science
	Version: 1.1
*/

#pragma segment statesgen

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#include "compiledefines.h"
#include "types.t"
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#include "system.h"
#include "settings.h"
#include "syntaxtr.t"
#include "comsupport.h"
#include "buildtree.h"
#include "codegen_types.h"
#include "codegen1.h"
#include "codegen2.h"
#include "statesgen.h"
#include "checker.h"
#include "instructions.h"
#include "optimisations.h"
#include "sa.h"

/* #include "dbprint.h" */

#define UNBOX_STRICT_CONSTRUCTOR_RECORD
#define UNBOX_STRICT_RECORD_WITH_ONE_FIELD
#define FASTER_STRICT_IF /* also in codegen2.c */
#define FASTER_STRICT_AND_OR
#define UNTUPLE_STRICT_TUPLES /* also in optimisations.c */

#define for_l(v,l,n) for(v=(l);v!=NULL;v=v->n)
#define for_la(v1,v2,l1,l2,n1) for(v1=(l1),v2=(l2);v1!=NULL;v1=v1->n1,++v2)
#define for_li(v,i,l,n) for(v=(l),i=0;v!=NULL;v=v->n,++i)
#define for_ll(v1,v2,l1,l2,n1,n2) for(v1=(l1),v2=(l2);v1!=NULL;v1=v1->n1,v2=v2->n2)
#define for_lla(v1,v2,v3,l1,l2,a3,n1,n2) for(v1=(l1),v2=(l2),v3=(a3);v1!=NULL;v1=v1->n1,v2=v2->n2,++v3)

static void error_in_function (char *m)
{
	ErrorInCompiler ("statesgen.c",m,"");
}

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static void error_in_function_s (char *m,char *s)
{
	ErrorInCompiler ("statesgen.c",m,s);
}

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static char *Elhsannots	  = "annotations are not allowed at this position";
static char *ECodeBlock	  = "missing type specification";
static char *Wtypeannot	  = "only strict annotations in a type rule will be regarded";
static char *Wparannot	  = "parallel annotations ignored in sequential mode";
static char *Wrootannot	  = "root annotations are ignored";
/*
static char *Econflict     = "conflicting parallel annotations";
static char *WEorIoverrule   = "strict annotation overruled by parallel annotation";
static char *WStrictoverrule = "parallel annotation overruled by strict annotation";
static char *Wapplannot = "parallel annotations on implicitly defined nodeids are ignored";
static char *Wnonterm	  = "non-terminating rule specified";
static char *Wunkannot       = "unknown annotation";
*/

/* some routines for setting the state fields of an object */

StateS BasicSymbolStates [Nr_Of_Predef_Types];

int FirstStateIsStricter (StateS offered_state,StateS demanded_state)
{
	if (offered_state.state_type==SimpleState){
		if (IsSimpleState (demanded_state)){
			switch (offered_state.state_kind){
				case OnB:
				case StrictOnA:
				case StrictRedirection:
					return 1;
				case OnA:
				case SemiStrict:
				case LazyRedirection:
				case Parallel:
				case UnderEval:
					return demanded_state.state_kind==OnA;
				default:
					error_in_function ("FirstStateIsStricter");
					return 0;
			}
		} else {
			return 0;
		}
	} else {
		if (IsSimpleState (demanded_state))
			return 1;
		else if (offered_state.state_type==ArrayState && demanded_state.state_type==ArrayState)
			return 1;
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		else if (offered_state.state_type==RecordState && demanded_state.state_type==RecordState)
			return 1;
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		else
			return 0;
	}
}

#define BETWEEN(l,h,v) ((unsigned)((v)-(l)) <= (unsigned)((h)-(l)))

int FieldArgumentNodeStatesAreStricter (ArgS *offered_args,ArgS *field_args,States record_states)
{
	ArgS *offered_arg,*field_arg;
	
	for_ll (offered_arg,field_arg,offered_args,field_args,arg_next,arg_next){
		int node_kind;
		Node arg_node;
		int field_number;
		
		field_number=field_arg->arg_node->node_symbol->symb_def->sdef_sel_field_number;

		arg_node=offered_arg->arg_node;
		
		node_kind=arg_node->node_kind;
		if (node_kind!=NodeIdNode){
			if (node_kind==NormalNode && (BETWEEN (int_denot,real_denot,arg_node->node_symbol->symb_kind) || arg_node->node_symbol->symb_kind==string_denot))
				;
			else
				if (!FirstStateIsStricter (arg_node->node_state,record_states[field_number]))
					return 0;		
		} else
			if (!FirstStateIsStricter (arg_node->node_node_id->nid_state,record_states[field_number]))
				return 0;
	}

	return 1;
}

void SetUnaryState (StateS *state_p,StateKind kind,ObjectKind object)
{
	state_p->state_arity = 1;
	state_p->state_kind = kind;
	state_p->state_object = object;
	state_p->state_type = SimpleState;
	state_p->state_mark = 0;
}

static void SetTupleState (StateS *state_p,States args,int arity)
{
	state_p->state_arity = arity;
	state_p->state_tuple_arguments = args;
	state_p->state_type = TupleState;
	state_p->state_mark = 0;
}

static void SetUpdateableTupleState (StateS *state_p,States args,int arity)
{
	state_p->state_arity = arity;
	state_p->state_tuple_arguments = args;
	state_p->state_type = TupleState;
	state_p->state_mark = STATE_ELEMENTS_UPDATEABLE_MASK;
}

static void SetRecordState (StateS *state_p,SymbDef record_sdef,int arity)
{
	RecordStateDescr recdesc;
	
	recdesc = (RecordStateDescr) CompAlloc (sizeof (struct record_state_descr) + (arity-1)*sizeof (struct state));
	recdesc->rs_symb = record_sdef;

	state_p->state_arity = arity;
	state_p->state_record_desc = recdesc;
	state_p->state_type = RecordState;
	state_p->state_mark = 0;
}

static void SetUnboxedArrayState (StateS *state_p,States arg)
{
	state_p->state_arity = 0;
	state_p->state_array_arguments = arg;
	state_p->state_type = ArrayState ;
	state_p->state_mark = 0;
}

StateS LazyState,StrictState; 

#define NewArrayOfStates(n)	(States) CompAlloc (sizeof (StateS)*(n))

static States NewArrayOfUnaryStates (int arity, StateKind init)
{
	int	i;
	States argstates;

	argstates = NewArrayOfStates (arity);

	for (i=0; i<arity; i++)
		SetUnaryState (&argstates [i], init, UnknownObj);

	return argstates;
}

void ConvertAnnotationToState (Annotation annot,StateS *state_p)
{
	if (annot==NoAnnot)
		return;
	else if (annot==StrictAnnot){
		*state_p=StrictState;
		return;
	} else {
		SetUnaryState (state_p, DoParallel ? Parallel : OnA, UnknownObj);
		if (DoParallel)
			state_p->state_mark |= STATE_PARALLEL_MASK;
		return;
	}
}

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#if 0
# include "dbprint.h"
extern File rules_file;
#endif

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static void GenRecordState (SymbDef sdef);

void ConvertTypeToState (TypeNode type,StateS *state_p,StateKind kind)
{
	Symbol symbol;

	symbol=type->type_node_symbol;

	if (symbol->symb_kind < Nr_Of_Predef_Types){
		*state_p = BasicSymbolStates [symbol->symb_kind];
		if (kind!=StrictOnA)
			state_p->state_kind=kind;
	} else if (symbol->symb_kind==definition && symbol->symb_def->sdef_kind==RECORDTYPE){
		if (kind==StrictOnA){
			GenRecordState (symbol->symb_def);
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#if BOXED_RECORDS
			if (symbol->symb_def->sdef_boxed_record)
				SetUnaryState (state_p,StrictOnA,RecordObj);
			else
#endif
				*state_p=symbol->symb_def->sdef_record_state;
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		} else
			SetUnaryState (state_p,kind,RecordObj);
	} else
#if ABSTRACT_OBJECT
	if (symbol->symb_kind==definition && symbol->symb_def->sdef_kind==ABSTYPE)
		SetUnaryState (state_p,kind,AbstractObj);
	else
#endif
		SetUnaryState (state_p,kind,UnknownObj);

#ifdef REUSE_UNIQUE_NODES
	if (type->type_node_attribute==UniqueAttr || (symbol->symb_kind==definition && 
			(symbol->symb_def->sdef_kind==TYPE || symbol->symb_def->sdef_kind==RECORDTYPE) &&
			symbol->symb_def->sdef_type->type_lhs->ft_attribute==UniqueAttr))
	{
		state_p->state_mark |= STATE_UNIQUE_MASK;
	}

	if ((state_p->state_mark & STATE_UNIQUE_MASK) && state_p->state_type==SimpleState){
		if (symbol->symb_kind==list_type || symbol->symb_kind==tuple_type || 
			(symbol->symb_kind==definition && (symbol->symb_def->sdef_kind==TYPE || symbol->symb_def->sdef_kind==RECORDTYPE)))
		{
			unsigned long unq_type_args;
			TypeArgs type_arg;
			int i;
			
			unq_type_args=0;
			for_li (type_arg,i,type->type_node_arguments,type_arg_next)
				if (type_arg->type_arg_node->type_node_attribute==UniqueAttr)
					unq_type_args |= 1<<i;
			
			if (unq_type_args!=0){
				state_p->state_mark |= STATE_UNIQUE_TYPE_ARGUMENTS_MASK;
				state_p->state_unq_type_args = unq_type_args;
			}
		}
	}
#endif

	if (kind==StrictOnA && IsSimpleState (*state_p)){
		ObjectKind obj_kind;
		
		obj_kind=state_p->state_object;
		if (obj_kind==TupleObj){
			int i; 
			TypeArgs arg;
			
			SetTupleState (state_p, NewArrayOfStates (type->type_node_arity), type->type_node_arity);

			for_li (arg,i,type->type_node_arguments,type_arg_next){
				TypeNode arg_type_node;
				
				arg_type_node=arg->type_arg_node;

				if (!arg_type_node->type_node_is_var){
					ConvertTypeToState (arg_type_node,&state_p->state_tuple_arguments[i],arg_type_node->type_node_annotation==NoAnnot ? OnA : StrictOnA);
#ifdef UNTUPLE_STRICT_TUPLES_
					arg_type_node->type_node_state=state_p->state_tuple_arguments[i];
#endif
				} else
					state_p->state_tuple_arguments[i] = arg_type_node->type_node_annotation==NoAnnot ? LazyState : StrictState;
			}
		} else if (obj_kind==UnboxedArrayObj || obj_kind==StrictArrayObj || obj_kind==ArrayObj){
			TypeNode element_node;
				
			element_node=type->type_node_arguments->type_arg_node;
			
			state_p->state_arity			= 1;
			state_p->state_array_arguments	= NewArrayOfStates (1);
			state_p->state_type				= ArrayState;
			state_p->state_mark=0;

			switch (obj_kind){
				case ArrayObj:
					SetUnaryState (& state_p->state_array_arguments [0], OnA, UnknownObj);
					break;
				case StrictArrayObj:
					state_p->state_array_arguments [0] = StrictState;
					break;
				case UnboxedArrayObj:
					if (element_node->type_node_is_var)
						state_p->state_array_arguments [0] = StrictState;
					else
						ConvertTypeToState (element_node,&state_p->state_array_arguments [0],StrictOnA);
					state_p->state_mark |= STATE_UNBOXED_ARRAY_MASK;
					break;
			}			
		}
	}
}

static void GenRecordState (SymbDef sdef)
{
	if (sdef->sdef_checkstatus < ConvertingToState){
		Types rectype;
		FieldList fields;
		States fieldstates;
		int i,oldline;
		Symbol oldsymbol;
		FlatType lhs;
		int strict_record;

		rectype = sdef->sdef_type;
		lhs = rectype->type_lhs;
		
		oldline		= CurrentLine;
		oldsymbol	= CurrentSymbol;
		
		CurrentSymbol	= lhs->ft_symbol;
		CurrentLine		= rectype->type_line;

		sdef->sdef_checkstatus = ConvertingToState; /* to detect cyclic strict field dependencies */
		SetRecordState (&sdef->sdef_record_state, sdef, sdef->sdef_cons_arity);
		fieldstates=sdef->sdef_record_state.state_record_arguments;

		strict_record=0;
		
		for_li (fields,i,rectype->type_fields,fl_next){
			TypeNode field_type_node;

			field_type_node = fields->fl_type;

			if (field_type_node->type_node_annotation==StrictAnnot){
				strict_record=1;
				if (!field_type_node->type_node_is_var){
					ConvertTypeToState (field_type_node,&fields->fl_state,StrictOnA);
					
					if (fields->fl_state.state_type==RecordState
#ifdef UNBOX_STRICT_RECORD_WITH_ONE_FIELD
						&& !(fields->fl_state.state_arity==1)
#endif
						)
					{
						SetUnaryState (&fieldstates[i], StrictOnA, RecordObj);
#ifdef REUSE_UNIQUE_NODES
						if (field_type_node->type_node_attribute==UniqueAttr)
							fieldstates[i].state_mark |= STATE_UNIQUE_MASK;
#endif	
					} else
						fieldstates[i]=fields->fl_state;
				} else
					fieldstates[i]=fields->fl_state=field_type_node->type_node_annotation==NoAnnot ? LazyState : StrictState;
#ifdef REUSE_UNIQUE_NODES
				if (field_type_node->type_node_attribute==UniqueAttr){
					fieldstates[i].state_mark |= STATE_UNIQUE_MASK;
					fields->fl_state.state_mark |= STATE_UNIQUE_MASK;
				}
#endif	
			} else {
				fieldstates[i] = LazyState;
#ifdef REUSE_UNIQUE_NODES
				if (field_type_node->type_node_attribute==UniqueAttr)
					fieldstates[i].state_mark |= STATE_UNIQUE_MASK;
#endif	
			}

			fields->fl_symbol->symb_def->sdef_sel_field = fields;
		}

		sdef->sdef_strict_constructor=strict_record;
		sdef->sdef_checkstatus = ConvertedToState; /* to detect cyclic strict field dependencies */
				
		CurrentSymbol = oldsymbol;
		CurrentLine = oldline;
	} else if (sdef->sdef_checkstatus == ConvertedToState)
		return;
	else
		StaticMessage (True, "%S", "%s cyclic strict field dependencies are not allowed", CurrentSymbol, sdef->sdef_ident->ident_name);
}

static void GenResultStatesOfLazyFields (SymbDef sdef)
{
	FieldList fields;
	Types rectype;
	int i;

	rectype = sdef->sdef_type;
	
	CurrentSymbol = rectype->type_lhs->ft_symbol;
	CurrentLine = rectype->type_line;
	
	for (i=0, fields = rectype->type_fields; fields; i++, fields = fields->fl_next){
		TypeNode field_type_node = fields->fl_type;
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		if (field_type_node->type_node_annotation!=StrictAnnot){
			if (field_type_node->type_node_is_var || field_type_node->type_node_symbol->symb_kind==apply_symb)
				SetUnaryState (&fields->fl_state, LazyRedirection, UnknownObj);
			else
				ConvertTypeToState (field_type_node,&fields->fl_state,StrictOnA);
		}
	}
}

static void ChangeFieldRecordStateForStrictAbsTypeFields (SymbDef icl_sdef,SymbDef dcl_sdef)
{
	Types icl_type;
	FieldList icl_field;
	StateP icl_fieldstate_p,dcl_fieldstate_p;

	icl_type = icl_sdef->sdef_type;

	CurrentSymbol = icl_type->type_lhs->ft_symbol;
	CurrentLine = icl_type->type_line;

	icl_fieldstate_p=icl_sdef->sdef_record_state.state_record_arguments;
	dcl_fieldstate_p=dcl_sdef->sdef_record_state.state_record_arguments;

	for_l (icl_field,icl_type->type_fields,fl_next){
		if (dcl_fieldstate_p->state_type==SimpleState &&
			(icl_fieldstate_p->state_type!=SimpleState ||
			icl_fieldstate_p->state_kind!=dcl_fieldstate_p->state_kind))
		{
			StaticMessage (False, "%S", "%S strict field is boxed because the field type is an abstract type",
				CurrentSymbol, icl_field->fl_symbol);
			
			*icl_fieldstate_p=*dcl_fieldstate_p;
		}
		
		++icl_fieldstate_p;
		++dcl_fieldstate_p;
	}
}

static void GenerateStatesForConstructors (SymbDef sdef)
{
	ConstructorList constructor;

	CurrentLine	 = sdef->sdef_type->type_line;

	for_l (constructor,sdef->sdef_type->type_constructors,cl_next){
		int strict_constructor;
		SymbDef constructor_sdef;
		TypeNode type_node;
		TypeArgs arg;
		StateP state_p;

		type_node=constructor->cl_constructor;
		CurrentSymbol=type_node->type_node_symbol;

		constructor_sdef=CurrentSymbol->symb_def;

		state_p = NewArrayOfStates (constructor_sdef->sdef_arity);
		constructor->cl_state_p = state_p;		

		constructor_sdef->sdef_constructor=constructor;

		strict_constructor=0;
	
		for_l (arg,type_node->type_node_arguments,type_arg_next){
			TypeNode type_arg_node;
			
			type_arg_node=arg->type_arg_node;
			
			if (type_arg_node->type_node_annotation==StrictAnnot){	
				strict_constructor=1;
				
				if (!type_arg_node->type_node_is_var){
					ConvertTypeToState (type_arg_node,state_p,StrictOnA);
					
					if (state_p->state_type==RecordState)
#ifdef UNBOX_STRICT_CONSTRUCTOR_RECORD
					if (type_node->type_node_arguments->type_arg_next!=NULL)
#endif
#ifdef UNBOX_STRICT_RECORD_WITH_ONE_FIELD
					if (!(state_p->state_arity==1))
#endif
						SetUnaryState (state_p, StrictOnA, RecordObj);
				} else {
					*state_p=StrictState;
				}
			} else
				*state_p=LazyState;

			++state_p;
		}
		
		constructor_sdef->sdef_strict_constructor=strict_constructor;
	}
}

static void ChangeElementStateForStrictAbsTypeFields (SymbDef icl_sdef,SymbDef dcl_sdef)
{
	Types icl_type = icl_sdef->sdef_type, dcl_type = dcl_sdef->sdef_type;
	ConstructorList icl_cons, dcl_cons;

	CurrentLine = icl_type->type_line;

	for (icl_cons = icl_type->type_constructors, dcl_cons = dcl_type->type_constructors; dcl_cons;
		 icl_cons = icl_cons->cl_next, dcl_cons = dcl_cons->cl_next)
	{
		TypeNode icl_node,dcl_node;
		SymbDef icl_constructor,dcl_constructor;
		
		icl_node=icl_cons->cl_constructor;
		icl_constructor=icl_node->type_node_symbol->symb_def;
		
		if (icl_constructor->sdef_strict_constructor){
			TypeArgs icl_arg,dcl_arg;
			StateP icl_arg_state_p,dcl_arg_state_p;
			
			dcl_node=dcl_cons->cl_constructor;
			CurrentSymbol=dcl_node->type_node_symbol;
			dcl_constructor=CurrentSymbol->symb_def;
					
			icl_arg=icl_node->type_node_arguments;
			dcl_arg=dcl_node->type_node_arguments;
			icl_arg_state_p=icl_cons->cl_state_p;
			dcl_arg_state_p=dcl_cons->cl_state_p;
			
			while (icl_arg!=NULL){
				TypeNode icl_element_node,dcl_element_node;
				
				icl_element_node=icl_arg->type_arg_node;
				dcl_element_node=dcl_arg->type_arg_node;

				if (dcl_arg_state_p->state_type==SimpleState &&
					(icl_arg_state_p->state_type!=SimpleState || icl_arg_state_p->state_kind!=dcl_arg_state_p->state_kind))
				{
					StaticMessage (False, "%S", "%S element is boxed because its type is an abstract type",
						CurrentSymbol, icl_element_node->type_node_symbol);
					
					*icl_arg_state_p=*dcl_arg_state_p;
				}
				
				icl_arg=icl_arg->type_arg_next;
				dcl_arg=dcl_arg->type_arg_next;
				++icl_arg_state_p;
				++dcl_arg_state_p;
			}
		}				
	}
}

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#ifdef CLEAN2
SymbDefP special_types[2];
#endif

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void GenerateStatesForRecords (Symbol symbols)
{
	Symbol symb;
	
	for_l (symb,symbols,symb_next)
		if (symb->symb_kind==definition){
			SymbDef def;

			def=symb->symb_def;
			if (def->sdef_kind==RECORDTYPE){
				GenRecordState (def);
				GenResultStatesOfLazyFields (def);

				if (def->sdef_exported){
					SymbDef dcl_sdef;
					
					dcl_sdef=def->sdef_dcl_icl;

					if (dcl_sdef!=NULL && dcl_sdef->sdef_kind==RECORDTYPE){
						GenRecordState (dcl_sdef);
						GenResultStatesOfLazyFields (dcl_sdef);
						ChangeFieldRecordStateForStrictAbsTypeFields (def,dcl_sdef);
					}
				}
			} else if (def->sdef_kind==TYPE){
				GenerateStatesForConstructors (def);
				
				if (def->sdef_exported){
					SymbDef dcl_sdef;
					
					dcl_sdef=def->sdef_dcl_icl;
					
					if (dcl_sdef->sdef_kind==TYPE){
						GenerateStatesForConstructors (dcl_sdef);
						ChangeElementStateForStrictAbsTypeFields (def,dcl_sdef);
					}
				}
			}
		}
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#ifdef CLEAN2
	if (special_types[0]!=NULL)
		BasicSymbolStates[integer_denot] = special_types[0]->sdef_record_state;
#endif
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}

/*
static Bool AnnotHasDeferAttr (Annotation annotkind)
{
	switch (annotkind){
		case InterleavedAnnot:
		case LazyInterleavedAnnot:
		case ContinueAnnot:
		case DeferAnnot:
		case WaitAnnot:
		case ContInterleavedAnnot:
		case InterleavedNFAnnot:
			return True;
		default:
			return False;
	}
}
*/	

static StateS DetermineStatesOfRuleType (TypeAlts ruletype,StateS *const function_state_p)
{
	TypeNode lhsroot;
	TypeArgs type_arg;
	StateP arg_state_p;

	lhsroot = ruletype->type_alt_lhs;
	
	CurrentSymbol	= lhsroot ->type_node_symbol;
	CurrentLine = ruletype->type_alt_line;
	
	if (lhsroot->type_node_annotation!=NoAnnot)
		StaticMessage (False, "%S", Wrootannot, CurrentSymbol);

	arg_state_p=function_state_p;
	for_l (type_arg,lhsroot->type_node_arguments,type_arg_next){
		if (!(type_arg->type_arg_node->type_node_annotation==NoAnnot || type_arg->type_arg_node->type_node_annotation==StrictAnnot))
			StaticMessage (False, "%S", Wtypeannot, CurrentSymbol);
	
		if (!type_arg->type_arg_node->type_node_is_var)
			ConvertTypeToState (type_arg->type_arg_node,arg_state_p,type_arg->type_arg_node->type_node_annotation==NoAnnot ? OnA : StrictOnA);
		else
			*arg_state_p = type_arg->type_arg_node->type_node_annotation==NoAnnot ? LazyState : StrictState;
		
		++arg_state_p;
	}

	if (ruletype->type_alt_rhs->type_node_is_var || ruletype->type_alt_rhs->type_node_symbol->symb_kind==apply_symb){
		function_state_p[-1] = StrictState;
		function_state_p[-1].state_kind = StrictRedirection;
	} else
		ConvertTypeToState (ruletype->type_alt_rhs,&function_state_p[-1],StrictOnA);

	return function_state_p[-1];
}

typedef struct type_node *TypeNodeP;

#ifdef REUSE_UNIQUE_NODES
# ifndef TRANSFORM_PATTERNS_BEFORE_STRICTNESS_ANALYSIS
static void determine_unique_state_of_constructor_argument (StateP result_state_p,StateP type_state_p,TypeNodeP type_arg_node,int lhs_type_attribute)
{
	if (type_arg_node->type_node_is_var){
		if ((type_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) &&
			type_arg_node->type_node_tv->tv_argument_nr>=0 &&
			(type_state_p->state_unq_type_args & (1<<(type_arg_node->type_node_tv->tv_argument_nr))))
		{
			result_state_p->state_mark |= STATE_UNIQUE_MASK;
		}
	} else {
		AttributeKind arg_type_attribute;
		
		arg_type_attribute=type_arg_node->type_node_attribute;
		
		if (arg_type_attribute==UniqueAttr || (arg_type_attribute>=FirstUniVarNumber && arg_type_attribute==lhs_type_attribute))
			result_state_p->state_mark |= STATE_UNIQUE_MASK;
		
		if ((result_state_p->state_mark & STATE_UNIQUE_MASK) && result_state_p->state_type==SimpleState){
			Symbol symbol;
			
			symbol=type_arg_node->type_node_symbol;

			if (symbol->symb_kind==list_type || symbol->symb_kind==tuple_type || (symbol->symb_kind==definition && 
				(symbol->symb_def->sdef_kind==TYPE || symbol->symb_def->sdef_kind==RECORDTYPE)))
			{
				unsigned long unq_type_args;
				TypeArgs type_arg;
				int i;
				
				unq_type_args=0;
				for_li (type_arg,i,type_arg_node->type_node_arguments,type_arg_next){
					TypeNodeP type_arg_node_p;
					
					type_arg_node_p=type_arg->type_arg_node;
					if (type_arg_node_p->type_node_is_var){
						if ((type_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) &&
							type_arg_node_p->type_node_tv->tv_argument_nr>=0 &&
							(type_state_p->state_unq_type_args & (1<<(type_arg_node_p->type_node_tv->tv_argument_nr))))
						{
							unq_type_args |= 1<<i;
						}
					} else {
						AttributeKind arg_type_attribute;

						arg_type_attribute=type_arg_node_p->type_node_attribute;
						if (arg_type_attribute==UniqueAttr || (arg_type_attribute>=FirstUniVarNumber && arg_type_attribute==lhs_type_attribute))
							unq_type_args |= 1<<i;
					}
				}
				
				if (unq_type_args!=0){
					result_state_p->state_mark |= STATE_UNIQUE_TYPE_ARGUMENTS_MASK;
					result_state_p->state_unq_type_args = unq_type_args;
				}
			}
		}
	}
}
# else
static StateP determine_unique_state_of_constructor_argument (StateP type_state_p,TypeNodeP type_arg_node,int lhs_type_attribute)
{	
	if (type_arg_node->type_node_is_var){
		if ((type_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) &&
			type_arg_node->type_node_tv->tv_argument_nr>=0 &&
			(type_state_p->state_unq_type_args & (1<<(type_arg_node->type_node_tv->tv_argument_nr))) &&
			(type_state_p->state_mark & STATE_UNIQUE_MASK)==0)
		{
			StateP result_state_p;
			
			result_state_p=CompAllocType (StateS);
			*result_state_p=*type_state_p;
			result_state_p->state_mark |= STATE_UNIQUE_MASK;
			
			return result_state_p;
		} else
			return type_state_p;
	} else {
		AttributeKind arg_type_attribute;
		StateP result_state_p;
		
		arg_type_attribute=type_arg_node->type_node_attribute;
		
		if (arg_type_attribute==UniqueAttr || (arg_type_attribute>=FirstUniVarNumber && arg_type_attribute==lhs_type_attribute)){
			result_state_p=CompAllocType (StateS);
			*result_state_p=*type_state_p;
			result_state_p->state_mark |= STATE_UNIQUE_MASK;
			
			type_state_p=result_state_p;
		} else
			result_state_p=NULL;
		
		if ((type_state_p->state_mark & STATE_UNIQUE_MASK) && type_state_p->state_type==SimpleState){
			Symbol symbol;
			
			symbol=type_arg_node->type_node_symbol;

			if (symbol->symb_kind==list_type || symbol->symb_kind==tuple_type || (symbol->symb_kind==definition && 
				(symbol->symb_def->sdef_kind==TYPE || symbol->symb_def->sdef_kind==RECORDTYPE)))
			{
				unsigned long unq_type_args;
				TypeArgs type_arg;
				int i;
				
				unq_type_args=0;
				for_li (type_arg,i,type_arg_node->type_node_arguments,type_arg_next){
					TypeNodeP type_arg_node_p;
					
					type_arg_node_p=type_arg->type_arg_node;
					if (type_arg_node_p->type_node_is_var){
						if ((type_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) &&
							type_arg_node_p->type_node_tv->tv_argument_nr>=0 &&
							(type_state_p->state_unq_type_args & (1<<(type_arg_node_p->type_node_tv->tv_argument_nr))))
						{
							unq_type_args |= 1<<i;
						}
					} else {
						AttributeKind arg_type_attribute;

						arg_type_attribute=type_arg_node_p->type_node_attribute;
						if (arg_type_attribute==UniqueAttr || (arg_type_attribute>=FirstUniVarNumber && arg_type_attribute==lhs_type_attribute))
							unq_type_args |= 1<<i;
					}
				}
				
				if (unq_type_args!=0){
					if (result_state_p==NULL){
						result_state_p=CompAllocType (StateS);
						*result_state_p=*type_state_p;
					}
					result_state_p->state_mark |= STATE_UNIQUE_TYPE_ARGUMENTS_MASK;
					result_state_p->state_unq_type_args = unq_type_args;
					
					return result_state_p;
				}
			}
		}
		
		return type_state_p;
	}
}
# endif
#endif

#ifndef TRANSFORM_PATTERNS_BEFORE_STRICTNESS_ANALYSIS
static void GenStatesInLhsSubArguments (Node argnode,StateS states[]);
static void GenStatesInLhsSubArg (Node argnode,StateP arg_state_p);

static void GenStatesInLhsNode (Node node,StateP arg_state_p)
{
	Args arg;

	if (node->node_annotation!=NoAnnot)
		StaticMessage (True, "%S", "%S %s",CurrentSymbol,node->node_symbol, Elhsannots);

	if (node->node_kind==NormalNode){
		Symbol symbol;
		
		symbol=node->node_symbol;
		if (symbol->symb_kind==definition){
			SymbDef sdef;

			sdef=symbol->symb_def;

			if (sdef->sdef_kind==CONSTRUCTOR){
# ifdef REUSE_UNIQUE_NODES
				AttributeKind lhs_type_attribute;
				
				lhs_type_attribute=sdef->sdef_type->type_lhs->ft_attribute;

				if (lhs_type_attribute==UniqueAttr)
					arg_state_p->state_mark |= STATE_UNIQUE_MASK;
				
				if (sdef->sdef_arity==node->node_arity && (arg_state_p->state_mark & STATE_UNIQUE_MASK)){
					if (sdef->sdef_strict_constructor){
						struct type_arg *type_arg_p;
						StateP constructor_arg_state_p;
						ArgS *arg;
						
						for_lla (arg,type_arg_p,constructor_arg_state_p,
								node->node_arguments,sdef->sdef_constructor->cl_constructor->type_node_arguments,symbol->symb_def->sdef_constructor->cl_state_p,
								arg_next,type_arg_next)
						{
							Node arg_node;
							
							arg->arg_state = *constructor_arg_state_p;
							
							determine_unique_state_of_constructor_argument (&arg->arg_state,arg_state_p,type_arg_p->type_arg_node,lhs_type_attribute);
														
							arg_node=arg->arg_node;
							
							if (arg_node->node_kind==NodeIdNode){
								arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
								arg_node=arg_node->node_node_id->nid_node;
								if (!arg_node)
									continue;
							}

							GenStatesInLhsSubArg (arg_node,&arg->arg_state);
						}							
					} else {
						struct type_arg *type_arg_p;
						ArgS *arg;
						
						for_ll (arg,type_arg_p,node->node_arguments,sdef->sdef_constructor->cl_constructor->type_node_arguments,arg_next,type_arg_next){
							Node arg_node;
							
							arg->arg_state=LazyState;							
							
							determine_unique_state_of_constructor_argument (&arg->arg_state,arg_state_p,type_arg_p->type_arg_node,lhs_type_attribute);

							arg_node=arg->arg_node;

							if (arg_node->node_kind==NodeIdNode){
								arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
								arg_node=arg_node->node_node_id->nid_node;
								if (!arg_node)
									continue;
							}
							
							GenStatesInLhsNode (arg_node,&arg->arg_state);
						}						
					}
					return;
				}
# endif				
				if (sdef->sdef_strict_constructor && sdef->sdef_arity==node->node_arity){
					GenStatesInLhsSubArguments (node,symbol->symb_def->sdef_constructor->cl_state_p);
					return;
				}
			} else if (sdef->sdef_kind==RECORDTYPE){
# ifdef REUSE_UNIQUE_NODES
				AttributeKind lhs_type_attribute;
				
				lhs_type_attribute=sdef->sdef_type->type_lhs->ft_attribute;

				if (lhs_type_attribute==UniqueAttr)
					arg_state_p->state_mark |= STATE_UNIQUE_MASK;
				
				if (arg_state_p->state_mark & STATE_UNIQUE_MASK){
					StateP arg_state_p;
					ArgS *arg;
					FieldList field;

					for_lla (arg,field,arg_state_p,node->node_arguments,
							 sdef->sdef_type->type_fields,sdef->sdef_record_state.state_record_arguments,arg_next,fl_next)
					{
						Node arg_node;
						
						arg->arg_state = *arg_state_p;

						determine_unique_state_of_constructor_argument (&arg->arg_state,arg_state_p,field->fl_type,lhs_type_attribute);
						
						arg_node=arg->arg_node;

						if (arg_node->node_kind==NodeIdNode){
							arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
							arg_node=arg_node->node_node_id->nid_node;
							if (!arg_node)
								continue;
						}

						GenStatesInLhsSubArg (arg_node,&arg->arg_state);
					}							
				} else				
# endif
				GenStatesInLhsSubArguments (node,sdef->sdef_record_state.state_record_arguments);
				return;
			}
		}
# ifdef REUSE_UNIQUE_NODES
		else if (symbol->symb_kind==cons_symb && (arg_state_p->state_mark & STATE_UNIQUE_MASK) && node->node_arity==2){
			Node arg_node;

			arg=node->node_arguments;
			
			arg->arg_state=LazyState;
			if ((arg_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) && (arg_state_p->state_unq_type_args & 1)){
				arg->arg_state.state_mark |= STATE_UNIQUE_MASK;
			}

			arg_node=arg->arg_node;
			if (arg_node->node_kind==NodeIdNode){
				arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
				arg_node=arg_node->node_node_id->nid_node;
			}
			if (arg_node!=NULL)
				GenStatesInLhsNode (arg_node,&arg->arg_state);

			arg=arg->arg_next;
			
			arg->arg_state=LazyState;
			arg->arg_state.state_mark |= STATE_UNIQUE_MASK;
			if ((arg_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) && (arg_state_p->state_unq_type_args & 1)){
				arg->arg_state.state_mark |= STATE_UNIQUE_TYPE_ARGUMENTS_MASK;
				arg->arg_state.state_unq_type_args = 1;
			}
			
			arg_node=arg->arg_node;
			if (arg_node->node_kind==NodeIdNode){
				arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
				arg_node=arg_node->node_node_id->nid_node;
			}
			if (arg_node!=NULL)
				GenStatesInLhsNode (arg_node,&arg->arg_state);
		
			return;
		} else if (symbol->symb_kind==tuple_symb && (arg_state_p->state_mark & STATE_UNIQUE_MASK)){
			int i;

			for_li (arg,i,node->node_arguments,arg_next){
				Node arg_node;
				
				arg->arg_state=LazyState;
				if ((arg_state_p->state_mark & STATE_UNIQUE_TYPE_ARGUMENTS_MASK) && (arg_state_p->state_unq_type_args & (1<<i))){
					arg->arg_state.state_mark |= STATE_UNIQUE_MASK;
				}

				arg_node=arg->arg_node;
				if (arg_node->node_kind==NodeIdNode){
					arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
					arg_node=arg_node->node_node_id->nid_node;
				}
				if (arg_node!=NULL)
					GenStatesInLhsNode (arg_node,&arg->arg_state);
			}
			
			return;
		}
# endif
	}

	for_l (arg,node->node_arguments,arg_next){
		Node arg_node;
		
		arg->arg_state=LazyState;
		
		arg_node=arg->arg_node;

		if (arg_node->node_kind==NodeIdNode){
			arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
			arg_node=arg_node->node_node_id->nid_node;
			if (!arg_node)
				continue;
		}
		
		GenStatesInLhsNode (arg_node,&arg->arg_state);
	}
}

static void GenStatesInLhsSubArg (Node arg_node,StateP arg_state_p)
{
	if (arg_node->node_annotation!=NoAnnot)
		StaticMessage (True, "%S", Elhsannots, CurrentSymbol);

	switch (arg_state_p->state_type){
		case RecordState:
			GenStatesInLhsSubArguments (arg_node,arg_node->node_symbol->symb_def->sdef_record_state.state_record_arguments);
			return;
		case TupleState:
			GenStatesInLhsSubArguments (arg_node,arg_state_p->state_tuple_arguments);
			return;
		default:
			GenStatesInLhsNode (arg_node,arg_state_p);
			return;
	}
}

static void GenStatesInLhsSubArguments (Node node,StateS states[])
{
	StateP arg_state_p;
	ArgS *arg;

	for (arg=node->node_arguments,arg_state_p=states; arg!=NULL; arg=arg->arg_next,++arg_state_p){
		Node arg_node;
		
		arg->arg_state = *arg_state_p;
			
		arg_node=arg->arg_node;

		if (arg_node->node_kind==NodeIdNode){
			arg_node->node_node_id->nid_lhs_state_p_=&arg->arg_state;
			arg_node=arg_node->node_node_id->nid_node;
			if (!arg_node)
				continue;
		}

		GenStatesInLhsSubArg (arg_node,&arg->arg_state);
	}	
}

static void DetermineLhsStatesOfRule (ImpRules rule)
{
	RuleAlts alt;
	StateP function_state_p;
	
	function_state_p=rule->rule_state_p;
	
	CurrentSymbol = rule->rule_root->node_symbol;
	
	for_l (alt,rule->rule_alts,alt_next){
		CurrentLine = alt->alt_line;
		
		GenStatesInLhsSubArguments (alt->alt_lhs_root,function_state_p);

		alt->alt_lhs_root->node_state = function_state_p[-1]; /* i.e. the result kind */
	}
}
#endif

unsigned next_def_number;

void ExamineTypesAndLhsOfImpRuleSymbolDefinitionAgain (SymbDef def)
{
	StateS rootstate;

	rootstate = DetermineStatesOfRuleType (def->sdef_rule->rule_type,def->sdef_rule->rule_state_p);

#ifndef TRANSFORM_PATTERNS_BEFORE_STRICTNESS_ANALYSIS
	DetermineLhsStatesOfRule (def->sdef_rule);
#endif

	if (def->sdef_exported && def->sdef_dcl_icl!=NULL && def->sdef_dcl_icl->sdef_kind!=INSTANCE)
		rootstate=def->sdef_dcl_icl->sdef_rule_type->rule_type_state_p[-1];

	if (IsSimpleState (rootstate)){
		if (rootstate.state_kind == OnA || rootstate.state_kind == StrictOnA){
			def->sdef_calledwithrootnode = True;
			def->sdef_returnsnode = True;
		} else if (rootstate.state_kind == StrictRedirection){
			def->sdef_calledwithrootnode = False;
			def->sdef_returnsnode = True;
		} else {
			def->sdef_calledwithrootnode = False;
			def->sdef_returnsnode = False;
		}
	} else {
		def->sdef_calledwithrootnode = False;
		def->sdef_returnsnode = False;
	}
}

#define allocate_function_state(arity) (((StateP)(CompAlloc (sizeof(StateS)*((arity)+1))))+1)

void ExamineTypesAndLhsOfSymbolDefinition (SymbDef def)
{
	StateS rootstate;

	if (def->sdef_over_arity!=0)
		return;

	def->sdef_number = 0;

	if (def->sdef_exported && def->sdef_dcl_icl!=def)
		def->sdef_mark |= SDEF_USED_LAZILY_MASK | SDEF_USED_CURRIED_MASK;

	switch (def->sdef_kind){
		case SYSRULE:
			def->sdef_ident->ident_symbol = NULL;
			def->sdef_ident->ident_environ = CurrentModule;
		case DEFRULE:
			if (def->sdef_isused){
				def->sdef_rule_type->rule_type_state_p = allocate_function_state (def->sdef_arity);
				rootstate = DetermineStatesOfRuleType (def->sdef_rule_type->rule_type_rule,def->sdef_rule_type->rule_type_state_p);
			} else
				return;
			break;
		case IMPRULE:
			if (def->sdef_module==CurrentModule)
				def->sdef_number = next_def_number++;

			def->sdef_rule->rule_state_p = allocate_function_state (def->sdef_arity);
			rootstate = DetermineStatesOfRuleType (def->sdef_rule->rule_type,def->sdef_rule->rule_state_p);
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			if (def->sdef_exported && def->sdef_dcl_icl!=NULL && def->sdef_dcl_icl->sdef_kind!=INSTANCE){
				def->sdef_dcl_icl->sdef_rule_type->rule_type_state_p = allocate_function_state (def->sdef_arity);
				rootstate = DetermineStatesOfRuleType (def->sdef_dcl_icl->sdef_rule_type->rule_type_rule,def->sdef_dcl_icl->sdef_rule_type->rule_type_state_p);
			}
#ifndef TRANSFORM_PATTERNS_BEFORE_STRICTNESS_ANALYSIS
			DetermineLhsStatesOfRule (def->sdef_rule);
#endif
			break;
		case RECORDTYPE:
		{
			FieldList fields;

			if (def->sdef_module==CurrentModule)
				def->sdef_number = next_def_number++;
			for_l (fields,def->sdef_type->type_fields,fl_next)
				ExamineTypesAndLhsOfSymbolDefinition (fields->fl_symbol->symb_def);

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			if (def->sdef_boxed_record){
				def->sdef_calledwithrootnode = True;
				def->sdef_returnsnode = True;
				return;
			}

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			rootstate = def->sdef_record_state;
			break;
		}
		case FIELDSELECTOR:
			rootstate = def->sdef_sel_field->fl_state;

			if (def->sdef_module==CurrentModule)
				def->sdef_number = next_def_number++;
			if (def->sdef_exported && def->sdef_dcl_icl!=NULL && def->sdef_dcl_icl->sdef_sel_field)
				rootstate = def->sdef_dcl_icl->sdef_sel_field->fl_state;
			break;
		case TYPE:
			if (def->sdef_module==CurrentModule)
				def->sdef_number = next_def_number++;
			rootstate = LazyState;
			break;
		case CONSTRUCTOR:
			if (def->sdef_module==CurrentModule)
				def->sdef_number = next_def_number++;
			rootstate = OnAState;
			break;
		default:
			rootstate = OnAState;
			break;
	}

	if (IsSimpleState (rootstate)){
		if (rootstate.state_kind == OnA || rootstate.state_kind == StrictOnA){
			def->sdef_calledwithrootnode = True;
			def->sdef_returnsnode = True;
		} else if (rootstate.state_kind == StrictRedirection){
			def->sdef_calledwithrootnode = False;
			def->sdef_returnsnode = True;
		} else {
			def->sdef_calledwithrootnode = False;
			def->sdef_returnsnode = False;
		}
	} else {
		def->sdef_calledwithrootnode = False;
		def->sdef_returnsnode = False;
	}
}

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#if STRICT_LISTS
extern PolyList unboxed_record_cons_list,unboxed_record_decons_list;
#endif

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void ExamineTypesAndLhsOfSymbols (Symbol symbs)
{
	next_def_number = 1;

	while (symbs!=NULL){
		if (symbs->symb_kind==definition)
			ExamineTypesAndLhsOfSymbolDefinition (symbs->symb_def);

		symbs=symbs->symb_next;
	}
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#if STRICT_LISTS
	{
		PolyList unboxed_record_cons_elem,unboxed_record_decons_elem;
		
		for_l (unboxed_record_cons_elem,unboxed_record_cons_list,pl_next)
			ExamineTypesAndLhsOfSymbolDefinition (unboxed_record_cons_elem->pl_elem);
		for_l (unboxed_record_decons_elem,unboxed_record_decons_list,pl_next)
			ExamineTypesAndLhsOfSymbolDefinition (unboxed_record_decons_elem->pl_elem);
	}
#endif
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}

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PolyList UserDefinedArrayFunctions;
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void ImportSymbols (Symbol symbols)
{
	Symbol symbol;	
	PolyList array_fun;
	
	for_l (array_fun,UserDefinedArrayFunctions,pl_next){
		SymbDef fun_def;
		
		fun_def = ((Symbol) array_fun->pl_elem)->symb_def;
		
		if (fun_def ->sdef_mark & (SDEF_USED_LAZILY_MASK | SDEF_USED_CURRIED_MASK))
			fun_def -> sdef_module = CurrentModule;
	}

	for_l (symbol,symbols,symb_next){
		SymbDef sdef;

		if (symbol->symb_kind==definition)
			sdef=symbol->symb_def;
		else
			continue;

		if (sdef->sdef_module!=CurrentModule){
			if (sdef->sdef_isused && sdef->sdef_over_arity==0)
				GenImport (sdef);

			if (sdef->sdef_kind==RECORDTYPE){
				FieldList fields;
	
				for_l (fields,sdef->sdef_type->type_fields,fl_next){
					SymbDef field_sdef;

					field_sdef=fields->fl_symbol->symb_def;

					if (field_sdef->sdef_isused && field_sdef->sdef_over_arity==0)
						GenImport (field_sdef);
				}
			}
		}
	}
}

static Bool ShouldDecrRefCount;

#if OPTIMIZE_LAZY_TUPLE_RECURSION
# define IF_OPTIMIZE_LAZY_TUPLE_RECURSION(a) ,a
#else
# define IF_OPTIMIZE_LAZY_TUPLE_RECURSION(a)
#endif

#if OPTIMIZE_LAZY_TUPLE_RECURSION
static int roots_are_tuples_or_calls_to_this_function (NodeP node_p,NodeDefP node_defs,SymbDef function_sdef_p)
{
	switch (node_p->node_kind){
		case SwitchNode:
		{
			ArgP arg_p;
			
			for_l (arg_p,node_p->node_arguments,arg_next)
				if (!roots_are_tuples_or_calls_to_this_function (arg_p->arg_node->node_arguments->arg_node,arg_p->arg_node->node_node_defs,function_sdef_p))
					return 0;
			
			return 1;
		}
		case PushNode:
			return roots_are_tuples_or_calls_to_this_function (node_p->node_arguments->arg_next->arg_node,node_defs,function_sdef_p);
		case GuardNode:
		{			
			while (node_p->node_kind==GuardNode){
				if (!roots_are_tuples_or_calls_to_this_function (node_p->node_arguments->arg_node,node_defs,function_sdef_p))
					return 0;
		
				node_defs=node_p->node_node_defs;
				node_p=node_p->node_arguments->arg_next->arg_node;
			}

			return roots_are_tuples_or_calls_to_this_function (node_p,node_defs,function_sdef_p);
		}
		case IfNode:
		{
			ArgP then_arg_p;
			NodeP else_node_p;
			
			then_arg_p=node_p->node_arguments->arg_next;
			
			if (!roots_are_tuples_or_calls_to_this_function (then_arg_p->arg_node,node_p->node_then_node_defs,function_sdef_p))
				return 0;
			
			else_node_p=then_arg_p->arg_next->arg_node;

			if (else_node_p->node_kind==NormalNode && else_node_p->node_symbol->symb_kind==fail_symb)
				return 1;

			return roots_are_tuples_or_calls_to_this_function (else_node_p,node_p->node_else_node_defs,function_sdef_p);
		}
		default:
		{
			if (node_p->node_kind==NormalNode){
				SymbolP node_symbol_p;
				
				node_symbol_p=node_p->node_symbol;
				if	(node_symbol_p->symb_kind==tuple_symb)
					return 1;
				else if (node_symbol_p->symb_kind==definition && node_symbol_p->symb_def==function_sdef_p
						&& node_p->node_arity==node_symbol_p->symb_def->sdef_arity)
					return 1;
			}
		}
	}
		
	return 0;
}
#endif

static void DecrRefCountCopiesOfArgs (Args args IF_OPTIMIZE_LAZY_TUPLE_RECURSION(int local_scope));

static void DecrRefCountCopiesOfArg (Args arg IF_OPTIMIZE_LAZY_TUPLE_RECURSION(int local_scope))
{
	Node node;
	
	node=arg->arg_node;
	
	if (node->node_kind!=NodeIdNode){
#if OPTIMIZE_LAZY_TUPLE_RECURSION
		if (OptimizeLazyTupleRecursion && node->node_kind==NormalNode && node->node_symbol->symb_kind==select_symb && node->node_arguments->arg_node->node_kind==NodeIdNode
			&& node->node_arguments->arg_node->node_node_id->nid_scope==local_scope
		){
			NodeId node_id;
		
			node_id=node->node_arguments->arg_node->node_node_id;
			
			if (node_id->nid_mark2 & NID_HAS_LAZY_SELECTOR_COUNTER){				
				++node_id->nid_lazy_selector_ref_count;

				if (node_id->nid_lazy_selector_ref_count==node_id->nid_refcount){
					NodeP node_id_def_node;
					
					node_id_def_node=node_id->nid_node_def->def_node;
					if (node_id_def_node->node_kind==NormalNode && node_id_def_node->node_symbol->symb_kind==definition
						&& node_id_def_node->node_symbol->symb_def->sdef_kind==IMPRULE && IsLazyState (node_id_def_node->node_state)
						&& node_id_def_node->node_symbol==CurrentSymbol
					){
						SymbDef function_sdef_p;
						RuleAltP rule_alt_p;
						
						function_sdef_p=node_id_def_node->node_symbol->symb_def;
						rule_alt_p=function_sdef_p->sdef_rule->rule_alts;
						
						if (roots_are_tuples_or_calls_to_this_function (rule_alt_p->alt_rhs_root,rule_alt_p->alt_rhs_defs,function_sdef_p)){
							node_id->nid_node_def->def_id->nid_mark2 |= NID_CALL_VIA_LAZY_SELECTIONS_ONLY;
							node_id_def_node->node_symbol->symb_def->sdef_rule->rule_mark |= RULE_CALL_VIA_LAZY_SELECTIONS_ONLY;
							if (ListOptimizations)
								printf ("Optimize lazy tuple recursion of %s\n",node_id_def_node->node_symbol->symb_def->sdef_ident->ident_name);
						}
					}
				}
			} else {
				node_id->nid_mark2 |= NID_HAS_LAZY_SELECTOR_COUNTER;
				node_id->nid_lazy_selector_ref_count=1;
			}
			
			if (node_id->nid_ref_count_copy>0 && node_id->nid_node_def)
				--node_id->nid_ref_count_copy__;
		} else
#endif
		DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
	} else {
		NodeId node_id;
		
		node_id=node->node_node_id;
		if (node_id->nid_ref_count_copy>0 && node_id->nid_node_def)
			--node_id->nid_ref_count_copy__;
	}
}

static void DecrRefCountCopiesOfArgs (Args args IF_OPTIMIZE_LAZY_TUPLE_RECURSION(int local_scope))
{
	for (; args; args = args->arg_next)
		DecrRefCountCopiesOfArg (args IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
}

static StateS *RemoveUndefinedsFromTupleState (StateS *state_p,int arity)
{
	int n;
	StateS *element_state_p,*new_element_states;

	element_state_p=state_p;
		
	new_element_states=NULL;
		
	for (n=0; n<arity; ++n, ++element_state_p){
		if (IsSimpleState (*element_state_p)){
			if (element_state_p->state_kind==Undefined){
				if (new_element_states==NULL){
					StateS *new_element_state_p,*old_element_state_p;
					int i;
					
					new_element_states=NewArrayOfStates (arity);
					element_state_p=&new_element_states[n];
					
					new_element_state_p=new_element_states;
					old_element_state_p=state_p;
					for (i=0; i<arity; ++i)
						*new_element_state_p++ = *old_element_state_p++;
				}
				element_state_p->state_kind=OnA;
			}
		} else if (element_state_p->state_type==TupleState){
			StateS *new_element_states_2;
			
			new_element_states_2=RemoveUndefinedsFromTupleState
				(element_state_p->state_tuple_arguments,element_state_p->state_arity);
			if (new_element_states_2){
				if (new_element_states==NULL){
					StateS *new_element_state_p,*old_element_state_p;
					int i;
					
					new_element_states=NewArrayOfStates (arity);
					element_state_p=&new_element_states[n];
					
					new_element_state_p=new_element_states;
					old_element_state_p=state_p;
					for (i=0; i<arity; ++i)
						*new_element_state_p++ = *old_element_state_p++;
				}
				element_state_p->state_tuple_arguments=new_element_states_2;				
			}
		}
	}

	return new_element_states;
}

static Bool ChangeState (StateS *old_state_p,StateS newstate)
{
	switch (old_state_p->state_kind){
		case OnA:
		case StrictOnA:		
			*old_state_p = newstate;
			return True;
		case Undefined:
			*old_state_p = newstate;
			return False;
		default:
			return False;
	}
}

static Bool AdjustState (StateS *old_state_p, StateS newstate)
{
	if (IsSimpleState (newstate)){
		if (IsSimpleState (*old_state_p)){
			switch (newstate.state_kind){
				case StrictOnA:
				case OnB:
					return ChangeState (old_state_p, newstate);
				default:
					return False;
			}
		} else
			return False;
	} else if (IsSimpleState (*old_state_p)){
		if (newstate.state_type==TupleState && 
			(old_state_p->state_kind==OnA || old_state_p->state_kind==StrictOnA || old_state_p->state_kind==Undefined))
		{
			StateS *element_states;
		
			element_states=RemoveUndefinedsFromTupleState (newstate.state_tuple_arguments,newstate.state_arity);
			
			*old_state_p=newstate;
			
			if (element_states){
/*				CheckWarning ("undefined state in tuple state removed",NULL); */
				old_state_p->state_tuple_arguments=element_states;
			}
			
			return old_state_p->state_kind!=Undefined;
		}

		return ChangeState (old_state_p,newstate);
	} else if (newstate.state_type==TupleState){
		int i, arity;
		StateS argstate;
		Bool new_arg_states;

		arity = old_state_p->state_arity;
		new_arg_states = False;

		Assume (newstate.state_arity == arity, "statesgen", "AdjustState");

		for (i=0; i<arity; i++){
			argstate = old_state_p->state_tuple_arguments[i];
			if (AdjustState (& argstate, newstate.state_tuple_arguments[i]) && ! new_arg_states){
				int j;
				States argstates;
			
				new_arg_states = True;
				argstates = NewArrayOfStates (arity);
				for (j=0; j<arity; j++)
					argstates[j] = old_state_p->state_tuple_arguments[j];
				old_state_p->state_tuple_arguments = argstates;
			}
			old_state_p->state_tuple_arguments[i] = argstate;
		}
		return new_arg_states;
	} else
		return False;
}

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static void DetermineStateOfThenOrElse (Args t_or_e_args, NodeDefs *t_or_e_defs, StateS demstate,int local_scope)
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{
	Node node;
	
	node=t_or_e_args->arg_node;
	
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	if (node->node_kind==NodeIdNode && *t_or_e_defs==NULL){
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		NodeId node_id;
		
		node_id=node->node_node_id;
		if (node_id->nid_ref_count_copy>=0)
			--node_id->nid_ref_count_copy__;	
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	} else {
#if 0
		FPrintF (rules_file,"DetermineStateOfThenOrElse %d\n",local_scope);
#endif
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		DetermineStatesOfRootNodeAndDefs (node,t_or_e_defs,demstate, local_scope);
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	}
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	AdjustState (&t_or_e_args->arg_state,demstate);
}

static void DecrementRefCountCopy (NodeId nid)
{ 
	if (nid->nid_ref_count_copy>0)
		--nid->nid_ref_count_copy__;
}

static Bool AdjustStateOfSharedNode (NodeId nid, StateS demstate, int local_scope)
{
	/*
		Note that if the reference count of a node identifier smaller than one means that the corresponding node 
		has already been treated. In that case it would be dangerous to adjust the node state
	*/
   	
	if (nid->nid_ref_count_copy>=0){
		NodeDefs nodedef;

		nodedef = nid->nid_node_def;

		if (nodedef!=NULL){
			int node_id_scope;
			
			if (ShouldDecrRefCount)
				DecrementRefCountCopy (nid);

			node_id_scope=nid->nid_scope;
			if (node_id_scope<0)
				node_id_scope=-node_id_scope;

#if 0
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			FPrintF (rules_file,"AdjustStateOfSharedNode ");
			DPrintNodeId (nid,rules_file);
			FPrintF (rules_file," %d %d\n",node_id_scope,local_scope);
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#endif

			if (node_id_scope>=local_scope){
				Node argnode;
				
				argnode = nodedef->def_node;
				if (nid->nid_mark & ON_A_CYCLE_MASK)
					AdjustState (&argnode->node_state, StrictState);
				else
					AdjustState (&argnode->node_state, demstate);
			}

			if (nodedef->def_node)
				return (nodedef->def_node->node_state.state_mark & STATE_PARALLEL_MASK)!=0;
		}
#if 0
		else {
			printf ("AdjustStateOfSharedNode nid_node_def=NULL ");
			DPrintNodeId (nid,StdOut);			
			printf (" %d %d\n",nid->nid_scope,local_scope);
		}
#endif
	}

	return False;
}

static Bool ArgInAStrictContext (Args arg, StateS demstate, Bool semistrict, int local_scope);

static Bool DetermineStrictArgContext (Args arg, StateS demstate, int local_scope)
{
	AdjustState (&arg->arg_state, demstate);
	
	return ArgInAStrictContext (arg, arg->arg_state, False, local_scope);
}

static StateP GetStateOfArguments (SymbDef sdef,int actual_arity)
{
	int symbol_arity;
	StateP state_p;
	
	switch (sdef->sdef_kind){
		case DEFRULE:
		case SYSRULE:
			state_p=sdef->sdef_rule_type->rule_type_state_p;
			symbol_arity = sdef->sdef_arity;
			break;
		case IMPRULE:
			state_p=sdef->sdef_rule->rule_state_p;
			symbol_arity = sdef->sdef_arity;
			break;
		case RECORDTYPE:
			state_p=sdef->sdef_record_state.state_record_arguments;
			symbol_arity = sdef->sdef_cons_arity;
			break;
		default:
			return NULL;
	}
			
	if (symbol_arity==actual_arity)
		return state_p;
	else
		return NULL;
}

static Bool ArgsInAStrictContext (StateP arg_state_p,Args argn, int local_scope)
{
	Bool parallel;
	
	parallel = False;

	for (; argn!=NULL; argn=argn->arg_next){	
		if (! IsLazyState (*arg_state_p)){
			if (DetermineStrictArgContext (argn,*arg_state_p,local_scope))
				parallel = True;
		} else if (ShouldDecrRefCount)
			DecrRefCountCopiesOfArg (argn IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
		
		++arg_state_p;
	}

	return parallel;
}

#if DESTRUCTIVE_RECORD_UPDATES
	static Bool UpdateNodeInAStrictOrSemiStrictContext (Node node,StateP demanded_state_p,int local_scope,Bool semi_strict)
#else
	static Bool UpdateNodeInAStrictOrSemiStrictContext (Node node,int local_scope,Bool semi_strict)
#endif
{
	Bool parallel;
	SymbDef record_sdef;
	int type_arg_number;
	ArgS *arg;
	StateP record_arg_states;

	parallel=False;
	
	record_sdef=node->node_symbol->symb_def;
	
	if (!semi_strict){
#if DESTRUCTIVE_RECORD_UPDATES
		if (demanded_state_p->state_type==SimpleState && 
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			demanded_state_p->state_kind==StrictOnA
/*			 && demanded_state_p->state_object==RecordObj */
			)
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		{
			node->node_state = *demanded_state_p;
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			node->node_state.state_object = RecordObj;
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		} else
#endif	
		node->node_state = record_sdef->sdef_record_state;
	}

	arg=node->node_arguments;
	
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	if (semi_strict){
		if (ArgInAStrictContext (arg,StrictState,True,local_scope))
			parallel = True;
	} else {

#if BOXED_RECORDS
		if (record_sdef->sdef_boxed_record){
			StateS boxed_record_state;
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			SetUnaryState (&boxed_record_state,StrictOnA,RecordObj);
			if (DetermineStrictArgContext (arg, boxed_record_state,local_scope))
				parallel = True;			
		} else
#endif

		if (DetermineStrictArgContext (arg, record_sdef->sdef_record_state,local_scope))
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			parallel = True;
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	}
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	type_arg_number=0;

	record_arg_states=record_sdef->sdef_record_state.state_record_arguments;
	
	while ((arg=arg->arg_next)!=NULL){
		int selector_number;
		Node selector_node;
			
		selector_node=arg->arg_node;
		selector_number=selector_node->node_symbol->symb_def->sdef_sel_field_number;
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#if 1
		type_arg_number=selector_number;
#else
		/* Codewarrior 6 optimizer bug */
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		while (type_arg_number!=selector_number){
			++type_arg_number;
		}
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#endif

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		if (!IsLazyState (record_arg_states[type_arg_number])){
			if (semi_strict
				? ArgInAStrictContext (selector_node->node_arguments,StrictState,True,local_scope)
				: DetermineStrictArgContext (selector_node->node_arguments,record_arg_states[type_arg_number],local_scope))
				parallel = True;
		} else if (ShouldDecrRefCount)
			DecrRefCountCopiesOfArg (selector_node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
	}
	
	if (parallel)
		node->node_state.state_mark |= STATE_PARALLEL_MASK;
	
	return parallel;
}

int optimise_strict_tuple_result_functions;

static Bool NodeInAStrictContext (Node node,StateS demanded_state,int local_scope)
{
	Bool parallel;
	
	parallel=False;

	if (node->node_kind==NormalNode){
		Symbol rootsymb;
		
		rootsymb = node->node_symbol;
		switch (rootsymb->symb_kind){
			case cons_symb:
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#if STRICT_LISTS
				if (node->node_arity==2){
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					if (rootsymb->symb_head_strictness>1)
						if (rootsymb->symb_head_strictness==4)
							parallel = DetermineStrictArgContext (node->node_arguments,*rootsymb->symb_unboxed_cons_state_p,local_scope);
						else
							parallel = DetermineStrictArgContext (node->node_arguments,StrictState,local_scope);
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					if (rootsymb->symb_tail_strictness)
						parallel = DetermineStrictArgContext (node->node_arguments->arg_next,StrictState,local_scope);
				}
#endif
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				if (ShouldDecrRefCount)
					DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
			case nil_symb:
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#if STRICT_LISTS
				if (rootsymb->symb_head_strictness & 1)
					parallel = DetermineStrictArgContext (node->node_arguments,StrictState,local_scope);
#endif

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				SetUnaryState (&node->node_state, StrictOnA, ListObj);
				break;
			case apply_symb:
				node->node_state = StrictState;
				node->node_state.state_kind = StrictRedirection;
				parallel = DetermineStrictArgContext (node->node_arguments, StrictState, local_scope);
				if (ShouldDecrRefCount)
					DecrRefCountCopiesOfArg (node->node_arguments->arg_next IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
				break;
			case if_symb:
			{
				Args args;
				
				args = node->node_arguments;
				node->node_state = StrictState;

				if (node->node_arity==3){
					if (DetermineStrictArgContext (args, BasicSymbolStates[bool_type], local_scope))
						parallel = True;

					args = args->arg_next;
#ifdef FASTER_STRICT_IF
					node->node_state=demanded_state;

					if (DetermineStrictArgContext (args,demanded_state,20000/*local_scope+1*/))
						parallel = True;

					args=args->arg_next;
					
					if (DetermineStrictArgContext (args,demanded_state,20000/*local_scope+1*/))
						parallel = True;

					break;
#else
					node->node_state.state_kind = StrictRedirection;
#endif
				}
				if (ShouldDecrRefCount)
					for (; args; args = args->arg_next)
						DecrRefCountCopiesOfArg (args IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
				break;
			}
			case select_symb:
			{
				Args arg;
				Node argnode;
				
				arg=node->node_arguments;
				
				SetUpdateableTupleState (&arg->arg_state, NewArrayOfUnaryStates (rootsymb->symb_arity, Undefined), rootsymb->symb_arity);
	
				arg->arg_state.state_tuple_arguments [node->node_arity - 1] = demanded_state;
				
				argnode=arg->arg_node;
				if (argnode->node_kind!=NodeIdNode)
					parallel = NodeInAStrictContext (argnode, arg->arg_state, local_scope);
				else {
					NodeId node_id;
					
					node_id=argnode->node_node_id;

					if (node_id->nid_ref_count_copy>=0 && node_id->nid_node_def){
						int node_id_scope;
					
						argnode = node_id->nid_node_def->def_node;
						
						if (ShouldDecrRefCount)
							DecrementRefCountCopy (node_id);
	
						node_id_scope=node_id->nid_scope;
						if (node_id_scope<0)
							node_id_scope=-node_id_scope;

#if 0
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						FPrintF (rules_file,"NodeInAStrictContext select_symb %d ",node->node_arity);
						DPrintNodeId (node_id,rules_file);
						FPrintF (rules_file," %d %d\n",node_id_scope,local_scope);
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#endif
						if (node_id_scope>=local_scope){
							if (IsSimpleState (argnode->node_state)){
								if (argnode->node_state.state_kind!=Parallel){
									SetUpdateableTupleState (&argnode->node_state, NewArrayOfUnaryStates (rootsymb->symb_arity, OnA), rootsymb->symb_arity);
									AdjustState (&argnode->node_state.state_tuple_arguments[node->node_arity-1],demanded_state);
								}
							} else {
								if ((argnode->node_state.state_mark & STATE_ELEMENTS_UPDATEABLE_MASK)==0){
									int i,arity;
									States arg_states;

									arity = argnode->node_state.state_arity;
									arg_states = NewArrayOfStates (arity);

									for (i=0; i<arity; ++i)
										arg_states[i] = argnode->node_state.state_tuple_arguments[i];
									
									argnode->node_state.state_tuple_arguments = arg_states;
									argnode->node_state.state_mark |= STATE_ELEMENTS_UPDATEABLE_MASK;
								}
								
								AdjustState (&argnode->node_state.state_tuple_arguments[node->node_arity-1],demanded_state);
							}
						}
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#if 0
						PrintState (argnode->node_state,rules_file);
						FPrintF (rules_file,"\n");
#endif
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					}
				}
				node->node_state = demanded_state;
				break;
			}
			case tuple_symb:
				if (IsSimpleState (demanded_state)){
					SetUnaryState (&node->node_state, StrictOnA, TupleObj);
					if (ShouldDecrRefCount)
						DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
				} else {
					Args arg; int i;
					
					for (i=0, arg=node->node_arguments; arg!=NULL; arg=arg->arg_next, i++){
						Bool par;
					
						par = False;
						if (!IsLazyState (demanded_state.state_tuple_arguments[i])){
							if (DetermineStrictArgContext (arg,demanded_state.state_tuple_arguments[i],local_scope))
								par = True;
						} else if (ShouldDecrRefCount)
							DecrRefCountCopiesOfArg (arg IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
						
						arg->arg_state = demanded_state.state_tuple_arguments[i];
						
						if (par){
							arg->arg_state.state_mark |= STATE_PARALLEL_MASK;
							parallel = True;
						}
					}
					node->node_state = demanded_state;
				}
				break;
			case definition:
			{
				StateP definition_state_p;
				SymbDef sdef;
				
				sdef = rootsymb->symb_def;
	
				if (sdef->sdef_arfun!=NoArrayFun
					&& (   (sdef->sdef_arfun==_UnqArraySelectLastFun || sdef->sdef_arfun==_UnqArraySelectNextFun) && node->node_arity==2)
						|| (sdef->sdef_arfun==_ArrayUpdateFun && node->node_arity==3))
				{
					StateP function_state_p;

					function_state_p=sdef->sdef_rule_type->rule_type_state_p;
				
					if (!(function_state_p[0].state_type==SimpleState && function_state_p[0].state_object==UnknownObj)){
						StateP arg_node_state_p;
						NodeP arg_node_p;
						ArgP arg_p;
						
						arg_p=node->node_arguments;

						if (sdef->sdef_arfun!=_ArrayUpdateFun){
							parallel = ArgsInAStrictContext (function_state_p,arg_p,local_scope);
							node->node_state = function_state_p[-1];

							arg_node_p=arg_p->arg_node;
							if (arg_node_p->node_kind!=NodeIdNode){
								arg_node_state_p=&arg_node_p->node_state;
													
								if (arg_node_state_p->state_type==TupleState && arg_node_state_p->state_tuple_arguments[1].state_type!=SimpleState){
									StateP tuple_state_args_p,tuple_result_state_args_p,result_state_p;
									
									result_state_p=&arg_node_state_p->state_tuple_arguments[1];
									
									tuple_state_args_p=CompAllocArray (2,StateS);
									tuple_state_args_p[0]=arg_p->arg_state.state_tuple_arguments[0];							
									tuple_state_args_p[1]=*result_state_p;	
									arg_p->arg_state.state_tuple_arguments=tuple_state_args_p;
									
									tuple_result_state_args_p=CompAllocArray (2,StateS);
									tuple_result_state_args_p[0]=node->node_state.state_tuple_arguments[0];
									tuple_result_state_args_p[1]=*result_state_p;
									node->node_state.state_tuple_arguments=tuple_result_state_args_p;
								}
							}
						} else {
							NodeP arg_node_p;

							if (demanded_state.state_type!=SimpleState){
								StateS arg_states[3],*update_arg_tuple_arg_states;
							
								arg_states[0]=function_state_p[0];
								arg_states[1]=function_state_p[1];
								arg_states[2]=function_state_p[2];
							
								update_arg_tuple_arg_states=NewArrayOfStates (2);
								update_arg_tuple_arg_states[0]=arg_states[0].state_tuple_arguments[0];
								update_arg_tuple_arg_states[1]=demanded_state;
								
								arg_states[0].state_tuple_arguments=update_arg_tuple_arg_states;
						
								parallel = ArgsInAStrictContext (arg_states,arg_p,local_scope);
								node->node_state = demanded_state;
							} else {
								parallel = ArgsInAStrictContext (function_state_p,arg_p,local_scope);
								node->node_state = function_state_p[-1];

								arg_node_p=arg_p->arg_node;
								if (arg_node_p->node_kind!=NodeIdNode){
									arg_node_state_p=&arg_node_p->node_state;
														
									if (arg_node_state_p->state_type==TupleState && arg_node_state_p->state_tuple_arguments[1].state_type!=SimpleState){
										StateP tuple_state_args_p,result_state_p;
										
										result_state_p=&arg_node_state_p->state_tuple_arguments[1];
										
										tuple_state_args_p=CompAllocArray (2,StateS);
										tuple_state_args_p[0]=arg_p->arg_state.state_tuple_arguments[0];							
										tuple_state_args_p[1]=*result_state_p;	
										arg_p->arg_state.state_tuple_arguments=tuple_state_args_p;
										
										node->node_state=*result_state_p;
									}
								}
							}
						}
						break;
					}
				}

				definition_state_p = GetStateOfArguments (sdef,node->node_arity);
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				if (definition_state_p!=NULL){
#ifdef FASTER_STRICT_AND_OR
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					if (sdef->sdef_module==StdBoolId->ident_name && node->node_arity==2){
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						if (sdef->sdef_ident==AndId){
							ArgP arg1,arg2,false_arg;
							NodeP false_node;
							
							arg1=node->node_arguments;
							arg2=arg1->arg_next;
							
							/* if arg2 is a node_id, incorrect code if and on root (redirection with jmpevalupd) */
							
							if (arg2->arg_node->node_kind!=NodeIdNode){	
								node->node_symbol=IfSymbol;
								node->node_arity=3;
								
								false_node=NewNode (FalseSymbol,NULL,0);
								false_node->node_state=LazyState;
								
								false_arg=NewArgument (false_node);
								false_arg->arg_state=LazyState;
								
								arg2->arg_next=false_arg;		

								return NodeInAStrictContext (node,demanded_state,local_scope);
							}
						} else if (sdef->sdef_ident==OrId){
							ArgP arg1,arg2,true_arg;
							NodeP true_node;
							
							arg1=node->node_arguments;
							arg2=arg1->arg_next;

							/* if arg2 is a node_id, incorrect code if or on root (redirection with jmpevalupd) */
							
							if (arg2->arg_node->node_kind!=NodeIdNode){									
								node->node_symbol=IfSymbol;
								node->node_arity=3;

								true_node=NewNode (TrueSymbol,NULL,0);
								true_node->node_state=LazyState;
								
								true_arg=NewArgument (true_node);
								true_arg->arg_state=LazyState;
			
								arg1->arg_next=true_arg;
								true_arg->arg_next=arg2;
								
								return NodeInAStrictContext (node,demanded_state,local_scope);
							}
						}
					}
#endif

					if (sdef->sdef_kind==IMPRULE && demanded_state.state_type==TupleState && definition_state_p[-1].state_type==TupleState
						&& !(sdef->sdef_rule->rule_mark & RULE_CAF_MASK) && sdef->sdef_rule->rule_alts->alt_kind==Contractum && optimise_strict_tuple_result_functions)
							optimise_tuple_result_function (node,demanded_state);

					if (sdef->sdef_kind==RECORDTYPE)
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#if BOXED_RECORDS
						if (sdef->sdef_boxed_record)
							SetUnaryState (&node->node_state,StrictOnA,RecordObj);
						else
#endif
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						node->node_state = sdef->sdef_record_state;
					else
						node->node_state = definition_state_p[-1];
					parallel = ArgsInAStrictContext (definition_state_p,node->node_arguments,local_scope);
				} else {
					if (sdef->sdef_kind==CONSTRUCTOR && sdef->sdef_strict_constructor && sdef->sdef_arity==node->node_arity){
						SetUnaryState (&node->node_state,StrictOnA,UnknownObj);
						parallel = ArgsInAStrictContext (sdef->sdef_constructor->cl_state_p,node->node_arguments,local_scope);
					} else {
						if (ShouldDecrRefCount)
							DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
						node->node_state = StrictState;
					}
				}
				break;
			}
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			case seq_symb:
				node->node_state=demanded_state;
				if (node->node_arity==2){
					parallel = DetermineStrictArgContext (node->node_arguments,StrictState,local_scope);
					parallel = DetermineStrictArgContext (node->node_arguments->arg_next,demanded_state,local_scope);
				} else {
					if (ShouldDecrRefCount)
						DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
					node->node_state = StrictState;
				}
				break;
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			default:
				if (rootsymb->symb_kind < Nr_Of_Predef_Types){
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					node->node_state = BasicSymbolStates [rootsymb->symb_kind];
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					node->node_state.state_kind = demanded_state.state_kind;
				}
				break;
		}
	} else if (node->node_kind==SelectorNode){
		SymbDef ssymb;
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		StateP record_state_p,unboxed_record_state_p;
#if BOXED_RECORDS
		static StateS boxed_record_state;
#endif		
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		ssymb = node->node_symbol->symb_def;
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		unboxed_record_state_p=&ssymb->sdef_type->type_lhs->ft_symbol->symb_def->sdef_record_state;
#if BOXED_RECORDS		
		if (ssymb->sdef_type->type_lhs->ft_symbol->symb_def->sdef_boxed_record){
			SetUnaryState (&boxed_record_state,StrictOnA,RecordObj);
			record_state_p = &boxed_record_state;
		} else
#endif
		record_state_p=unboxed_record_state_p;
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		if (node->node_arity>=SELECTOR_U){
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			StateP tuple_arg_states;
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			tuple_arg_states=NewArrayOfStates (2);

			if (node->node_arity>=SELECTOR_L){
				StateS sel_arg_state,*sel_arg_tuple_arg_states;
				NodeP arg_node_p;

				sel_arg_tuple_arg_states=NewArrayOfStates (2);
				sel_arg_tuple_arg_states[0]=*record_state_p;
				
				if (demanded_state.state_type==TupleState && !IsLazyState (demanded_state.state_tuple_arguments[1])){
					sel_arg_tuple_arg_states[1]=demanded_state.state_tuple_arguments[1];
					tuple_arg_states[1]=demanded_state.state_tuple_arguments[1];
				} else {
					sel_arg_tuple_arg_states[1]=StrictState;
					tuple_arg_states[1]=StrictState;
				}
				SetTupleState (&sel_arg_state,sel_arg_tuple_arg_states,2);
				
				parallel = DetermineStrictArgContext (node->node_arguments,sel_arg_state,local_scope);

				arg_node_p=node->node_arguments->arg_node;
				if (arg_node_p->node_kind!=NodeIdNode && arg_node_p->node_state.state_type==TupleState
					&& arg_node_p->node_state.state_tuple_arguments[1].state_type!=SimpleState)
				{
					StateP result_state_p;
				
					result_state_p=&arg_node_p->node_state.state_tuple_arguments[1];
					
					tuple_arg_states[1]=*result_state_p;
					sel_arg_tuple_arg_states[1]=*result_state_p;	
				}
			} else {
				parallel = DetermineStrictArgContext (node->node_arguments,*record_state_p,local_scope);
				tuple_arg_states[1]=*record_state_p;
			}			

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			tuple_arg_states[0]=unboxed_record_state_p->state_record_arguments[ssymb->sdef_sel_field_number];
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			SetTupleState (&node->node_state,tuple_arg_states,2);
		} else {
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			parallel = DetermineStrictArgContext (node->node_arguments,*record_state_p,local_scope);
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			node->node_state=demanded_state;
		}
	} else if (node->node_kind==UpdateNode)
#if DESTRUCTIVE_RECORD_UPDATES
		return UpdateNodeInAStrictOrSemiStrictContext (node,&demanded_state,local_scope,False);
#else
		return UpdateNodeInAStrictOrSemiStrictContext (node,local_scope,False);
#endif
	else if (node->node_kind==MatchNode){
		parallel = DetermineStrictArgContext (node->node_arguments,StrictState,local_scope);

		node->node_state=demanded_state;		
	} else
		error_in_function ("NodeInAStrictContext");

	if (parallel)
		node->node_state.state_mark |= STATE_PARALLEL_MASK;

	return parallel;	
}

static Bool NodeInASemiStrictContext (Node node, int local_scope);

static Bool ArgInAStrictContext (Args arg, StateS demstate, Bool semistrict, int local_scope)
{
	Bool parallel;
	Node argnode;

	parallel = False;

	argnode=arg->arg_node;
	
	if (argnode->node_kind!=NodeIdNode){
		if (semistrict && argnode->node_number<0){
			parallel = NodeInASemiStrictContext (argnode,local_scope);
			argnode->node_state.state_kind = SemiStrict;
		} else
			parallel = NodeInAStrictContext (argnode, demstate, local_scope);
	} else
		parallel =  AdjustStateOfSharedNode (argnode->node_node_id, demstate, local_scope);

	if (parallel)
		arg->arg_state.state_mark |= STATE_PARALLEL_MASK;

	return parallel;
}

static Bool NodeInASemiStrictContext (Node node,int local_scope)
{
	switch (node->node_kind){
		case NormalNode:
		{
			Bool parallel;
			Symbol symb;

			symb = node->node_symbol;

			parallel = False;
			
			if (symb->symb_kind==definition){
				SymbDef sdef;
				ArgP arg_p;
				StateP arg_state_p;
				
				sdef=symb->symb_def;
				arg_state_p = GetStateOfArguments (sdef,node->node_arity);

				if (arg_state_p==NULL && sdef->sdef_kind==CONSTRUCTOR &&
					sdef->sdef_strict_constructor && sdef->sdef_arity==node->node_arity)
				{
					arg_state_p=sdef->sdef_constructor->cl_state_p;
				}
					
				if (arg_state_p!=NULL){
					for_l (arg_p,node->node_arguments,arg_next){
						if (IsLazyState (*arg_state_p)){
							if (ShouldDecrRefCount)
								DecrRefCountCopiesOfArg (arg_p IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
						} else 
							if (ArgInAStrictContext (arg_p,StrictState,True,local_scope))
								parallel = True;
						
						++arg_state_p;
					}
				} else
					DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
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			}
#if STRICT_LISTS
			else if (symb->symb_kind==cons_symb && node->node_arity==2){
				ArgP arg_p;
				
				arg_p=node->node_arguments;				
				if (symb->symb_head_strictness>1){
					if (ArgInAStrictContext (arg_p,StrictState,True,local_scope))
						parallel = True;
				} else
					if (ShouldDecrRefCount)
						DecrRefCountCopiesOfArg (arg_p IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));

				arg_p=arg_p->arg_next;
				if (symb->symb_tail_strictness){
					if (ArgInAStrictContext (arg_p,StrictState,True,local_scope))
						parallel = True;
				} else
					if (ShouldDecrRefCount)
						DecrRefCountCopiesOfArg (arg_p IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));
			}
#endif
			else
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				DecrRefCountCopiesOfArgs (node->node_arguments IF_OPTIMIZE_LAZY_TUPLE_RECURSION(local_scope));

			if (parallel)
				node->node_state.state_mark |= STATE_PARALLEL_MASK;
		
			return parallel;
		}
		case SelectorNode:
		case MatchNode:
			if (ArgInAStrictContext (node->node_arguments,StrictState,True,local_scope)){
				node->node_state.state_mark |= STATE_PARALLEL_MASK;
				return True;
			} else
				return False;
		case UpdateNode:
#if DESTRUCTIVE_RECORD_UPDATES
			return UpdateNodeInAStrictOrSemiStrictContext (node,&StrictState,local_scope,True);
#else		
			return UpdateNodeInAStrictOrSemiStrictContext (node,local_scope,True);
#endif
		default:
			error_in_function ("NodeInASemiStrictContext");
			return False;
	}
}

static void DetermineStatesOfNonIfRootNode (Node root,NodeId root_id,StateS demstate,int local_scope)
{	
	if (root->node_state.state_kind != OnA){
		StaticMessage (False, "%S", Wrootannot, CurrentSymbol);
		root->node_state.state_kind = OnA;
	}
	
	if (root_id)
		root_id->nid_ref_count_copy_=-1; /* to indicate that this node has been examined */
	
	if (root_id && (root_id->nid_mark & ON_A_CYCLE_MASK)){
		(void) NodeInASemiStrictContext (root, local_scope);
		root->node_state.state_kind = SemiStrict;
	} else
		NodeInAStrictContext (root, demstate, local_scope);
}

static int scope;
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static void DetermineStatesRootNode (Node node, NodeId nid, StateS demstate,int local_scope);
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static void DetermineStatesIfRootNode (Node node, StateS demstate,int local_scope)
{
	Args condpart;
	int new_local_scope;
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	new_local_scope=scope+2;
	scope+=3;
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	condpart = node->node_arguments;
			
	AdjustState (&condpart->arg_state, BasicSymbolStates [bool_type]);
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	if (condpart->arg_node->node_kind!=NodeIdNode)
		DetermineStatesRootNode (condpart->arg_node, NULL,condpart->arg_state, local_scope);
	else 
		/* the parallel state of the condition is not needed */
		AdjustStateOfSharedNode (condpart->arg_node->node_node_id,condpart->arg_state,local_scope);
	
	AdjustState (&node->node_state, demstate);

	++scope;
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	DetermineStateOfThenOrElse (condpart->arg_next,&node->node_then_node_defs,demstate,new_local_scope);
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	++scope;
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	DetermineStateOfThenOrElse (condpart->arg_next->arg_next,&node->node_else_node_defs,demstate,new_local_scope);
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}
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static void DetermineStatesSwitchRootNode (Node root_node, StateS demstate, int local_scope)
{
	ArgP arg_p;

	AdjustState (&root_node->node_state, demstate);

	for_l (arg_p,root_node->node_arguments,arg_next){
		NodeP node;

		node=arg_p->arg_node;
		if (node->node_kind==CaseNode){
			NodeP case_alt_node_p;

			case_alt_node_p=node->node_arguments->arg_node;
/*	Codewarrior bug			if (case_alt_node_p->node_kind==PushNode){  */
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			if (node->node_arguments->arg_node->node_kind==PushNode)
				DetermineStatesOfRootNodeAndDefs (case_alt_node_p->node_arguments->arg_next->arg_node,&node->node_node_defs,demstate,local_scope);
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			else
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				DetermineStatesOfRootNodeAndDefs (node->node_arguments->arg_node,&node->node_node_defs,demstate,local_scope);
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		} else if (node->node_kind==DefaultNode){
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			DetermineStatesOfRootNodeAndDefs (node->node_arguments->arg_node,&node->node_node_defs,demstate,local_scope);
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