backend.c 79.2 KB
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#define CODE_INLINE_FLAG
#define DYNAMIC_TYPE 1

# include "compiledefines.h"
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# include "types.t"
# include "system.h"
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# include "syntaxtr.t"
# include "codegen_types.h"
# include "statesgen.h"
# include "codegen.h"
# include "codegen2.h"
# include "instructions.h"
# include "sizes.h"
# include "set_scope_numbers.h"

# include "scanner.h"		/* InitScanner, ScanInitIdentStringTable */
# include "checker.h"		/* scc_dependency_list, ClearOpenDefinitionModules, AddOpenDefinitionModule */
# include "comsupport.h" 	/* CurrentModule */
# include "buildtree.h"		/* TupleSymbol, ApplySymbol */

# include "backendsupport.h"
# define Clean(ignore)

# include "dynamics.h"

# include "backend.h"

# include <limits.h>

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# if 1
# include "dbprint.h"
# endif

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void
BEGetVersion (int *current, int *oldestDefinition, int *oldestImplementation)
{
	*current				= kBEVersionCurrent;
	*oldestDefinition		= kBEVersionOldestDefinition;
	*oldestImplementation	= kBEVersionOldestImplementation;
}


extern PolyList UserDefinedArrayFunctions;	/* typechecker.c */
extern StdOutReopened, StdErrorReopened;	/* cocl.c */

/*
	Strings
	=======
*/
static char *
ConvertCleanString (CleanString string)
{
	int		length;
	char	*copy;

	length	= string->length;
	copy	= ConvertAlloc (length+1);
	strncpy (copy, string->chars, length);
	copy [length]	= '\0';

	return (copy);
} /* ConvertCleanString */

/*
	Counting routines
*/

static short
CountTypeArgs (BETypeArgP args)
{
	short	n;

	n	= 0;
	for (; args != NULL; args = args->type_arg_next)
		n++;

	return (n);
} /* CountTypeArgs */

static short
CountArgs (BEArgP args)
{
	short	n;

	n	= 0;
	for (; args != NULL; args = args->arg_next)
		n++;

	return (n);
} /* CountArgs */

/*
	BE routines
*/
STRUCT (be_module, BEModule)
{
	char			*bem_name;
	Bool			bem_isSystemModule;

	unsigned int	bem_nFunctions;
	SymbolP			bem_functions;
	unsigned int	bem_nConstructors;

	unsigned int	bem_nTypes;
	SymbolP			*bem_types;

	SymbolP			*bem_constructors;

	unsigned int	bem_nFields;
	SymbolP			bem_fields;
};

STRUCT (be_icl_module, BEIcl)
{
	ImpMod			beicl_module;
	BEModuleS		beicl_dcl_module;

	// +++ remove this (build deps list separately)
	SymbDefP		*beicl_depsP;
	unsigned int	beicl_previousAncestor;
};

STRUCT (be_state, BEState)
{
	Bool			be_initialised;

	char			**be_argv;
	int				be_argc;
	int				be_argi;

	BEModuleP		be_modules;

	BEIclS			be_icl;
	unsigned int	be_nModules;

	SymbolP			be_allSymbols;
	SymbolP			be_dontCareSymbol;
	SymbolP			be_dictionarySelectFunSymbol;
	SymbolP			be_dictionaryUpdateFunSymbol;
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	// temporary hack
	int				be_dynamicTypeIndex;
	int				be_dynamicModuleIndex;
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};

static BEStateS	gBEState = {False /* ... */};

/* +++ dynamic allocation */
# define	kMaxNumberOfNodeIds	1000

STRUCT (be_locally_generated_function_info, BELocallyGeneratedFunction)
{
	char	*lgf_name;
	int		lgf_arity;
};

static BELocallyGeneratedFunctionS gLocallyGeneratedFunctions[] = {{"_dictionary_select", 3}, {"_dictionary_update", 4}};
# define	kDictionarySelect	0
# define	kDictionaryUpdate	1

// +++ put in gBEState
static NodeIdP	gCurrentNodeIds [kMaxNumberOfNodeIds];
static SymbolP	gBasicSymbols [Nr_Of_Predef_FunsOrConses];
static SymbolP	gTupleSelectSymbols [MaxNodeArity];

static int number_of_node_ids=0;

static IdentP
Identifier (char *name)
{
	IdentP	ident;

	ident	= ConvertAllocType (IdentS);
	ident->ident_name	= name;

	return (ident);
} /* Identifier */

static SymbolP
PredefinedSymbol (SymbKind symbolKind, int arity)
{
	SymbolP	symbol;

	symbol	= ConvertAllocType (SymbolS);

	symbol->symb_kind	= symbolKind;
	symbol->symb_arity	= arity;

	return (symbol);
} /* PredefinedSymbol */

static SymbolP
AllocateSymbols (int nSymbols, SymbolP otherSymbols)
{
	int		i;
	SymbolP	symbols;

	if (nSymbols > 0)
	{
		symbols	= (SymbolP) ConvertAlloc (nSymbols * sizeof (SymbolS));
	
		for (i = 0; i < nSymbols; i++)
		{
			symbols [i].symb_kind	= erroneous_symb;
			symbols [i].symb_next	= &symbols [i+1];
		}
		symbols [nSymbols-1].symb_next	= otherSymbols;
	}
	else
		symbols	= otherSymbols;

	return (symbols);
} /* AllocateSymbols */

static void
InitPredefinedSymbols (void)
{
	int	i;

	gBasicSymbols [int_type]		= PredefinedSymbol (int_type, 0);
	gBasicSymbols [bool_type]		= PredefinedSymbol (bool_type, 0);
	gBasicSymbols [char_type]		= PredefinedSymbol (char_type, 0);
	gBasicSymbols [real_type]		= PredefinedSymbol (real_type, 0);
	gBasicSymbols [file_type]		= PredefinedSymbol (file_type, 0);
	gBasicSymbols [world_type]		= PredefinedSymbol (world_type, 0);
#if DYNAMIC_TYPE
	gBasicSymbols [dynamic_type]= PredefinedSymbol (dynamic_type, 0);
#endif
	gBasicSymbols [array_type]			= PredefinedSymbol (array_type, 1);
	gBasicSymbols [strict_array_type]	= PredefinedSymbol (strict_array_type, 1);
	gBasicSymbols [unboxed_array_type]	= PredefinedSymbol (unboxed_array_type, 1);

	gBasicSymbols [fun_type]	= PredefinedSymbol (fun_type, 2);


	ApplySymbol	= PredefinedSymbol (apply_symb, 2);
	gBasicSymbols [apply_symb]	= ApplySymbol;

	TupleSymbol	= PredefinedSymbol (tuple_symb, 2); /* arity doesn't matter */
	gBasicSymbols [tuple_symb]	= TupleSymbol;
	gBasicSymbols [tuple_type]	= PredefinedSymbol (tuple_type, 2);

	gBasicSymbols [if_symb]		= PredefinedSymbol (if_symb, 3);
	gBasicSymbols [fail_symb]	= PredefinedSymbol (fail_symb, 0);

	gBasicSymbols [nil_symb]	= PredefinedSymbol (nil_symb, 0);
	gBasicSymbols [cons_symb]	= PredefinedSymbol (cons_symb, 2);

	for (i = 0; i < MaxNodeArity; i++)
		gTupleSelectSymbols [i]	= NULL;

} /* InitPredefinedSymbols */

static void
AddUserDefinedArrayFunction (SymbolP functionSymbol)
{
	PolyList	elem;

	elem	= ConvertAllocType (struct poly_list);

	elem->pl_elem	= functionSymbol;
	elem->pl_next	= UserDefinedArrayFunctions;
	UserDefinedArrayFunctions	= elem;
} /* AddUserDefinedArrayFunction */

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static Node
NewGuardNode (NodeP ifNode, NodeP node, NodeDefP nodeDefs, StrictNodeIdP stricts)
{
	NodeP	guardNode;
	
	guardNode	= ConvertAllocType (NodeS);
	
	guardNode->node_kind		= GuardNode;
	guardNode->node_node_defs	= nodeDefs;
	guardNode->node_arity		= 2;
	guardNode->node_guard_strict_node_ids	= stricts;

	guardNode->node_arguments	= BEArgs (ifNode, BEArgs (node, NULL));
	
	return (guardNode);
} /* NewGuardNode */


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static void
DeclareModule (int moduleIndex, char *name, Bool isSystemModule, int nFunctions,
											int nTypes, int nConstructors, int nFields)
{
	BEModuleP	module;
	SymbolP		symbols, allSymbols;

	allSymbols	= gBEState.be_allSymbols;

	allSymbols	= AllocateSymbols (nFunctions + nTypes + nConstructors + nFields, allSymbols);

	Assert ((unsigned int) moduleIndex < gBEState.be_nModules);
	module	= &gBEState.be_modules [moduleIndex];

	module->bem_name			= name;
	module->bem_isSystemModule	= isSystemModule;

	symbols	= allSymbols;

	module->bem_nFunctions	= (unsigned int) nFunctions;
	module->bem_functions	= symbols;
	symbols	+=	nFunctions;

	module->bem_nTypes	= (unsigned int) nTypes;
//	module->bem_types	= symbols;
	{
		/* +++ do this lazily */
		int	i;
		
		module->bem_types	= (SymbolP *) ConvertAlloc (nTypes * sizeof (SymbolP));

		for (i = 0; i < nTypes; i++)
		{
			module->bem_types [i]	= &symbols [i];
		}
	}
	{
		/* +++ change this */
		int		i;
		for (i = 0; i < nTypes; i++)
		{
			SymbDef	newSymbDef;

			newSymbDef	= ConvertAllocType (SymbDefS);
			newSymbDef->sdef_isused	= False;
			symbols [i].symb_def	= newSymbDef;
		}
	}
	symbols	+=	nTypes;

	module->bem_nConstructors	= (unsigned int) nConstructors;
//	module->bem_constructors	= symbols;
	{
		/* +++ do this lazily */
		int	i;
		
		module->bem_constructors	= (SymbolP *) ConvertAlloc (nConstructors * sizeof (SymbolP));

		for (i = 0; i < nConstructors; i++)
		{
			module->bem_constructors [i]	= &symbols [i];
		}
	}
	symbols	+=	nConstructors;

	module->bem_nFields	= (unsigned int) nFields;
	module->bem_fields	= symbols;
	symbols	+=	nFields;

	gBEState.be_allSymbols	= allSymbols;
} /* DeclareModule */

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static int main_dcl_module_n=0;

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void
BESetMainDclModuleN (int main_dcl_module_n_parameter)
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{
	main_dcl_module_n=main_dcl_module_n_parameter;
}

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void
BEDeclareIclModule (CleanString name, int nFunctions, int nTypes, int nConstructors, int nFields)
{
	int		i;
	char	*cName;
	SymbolP	moduleNameSymbol;
	ImpMod	iclModule;
	BEIclP	icl;

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	cName	= gBEState.be_modules [main_dcl_module_n].bem_name;
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	if (cName == NULL)
		cName	= ConvertCleanString (name);

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	moduleNameSymbol	= ConvertAllocType (SymbolS);
	moduleNameSymbol->symb_ident	= Identifier (cName);

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/*	Assert (strcmp (gBEState.be_modules [main_dcl_module_n].bem_name, cName) == 0); */
	Assert (strncmp (cName, name->chars, name->length) == 0);
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	icl	= &gBEState.be_icl;

	icl->beicl_module		= ConvertAllocType (ImpRepr);
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	icl->beicl_dcl_module	= gBEState.be_modules [main_dcl_module_n];
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	icl->beicl_previousAncestor	= UINT_MAX;
	scc_dependency_list	= NULL;
	icl->beicl_depsP	= &scc_dependency_list;

	nFunctions	+= ArraySize (gLocallyGeneratedFunctions);
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	DeclareModule (main_dcl_module_n, cName, False, nFunctions, nTypes, nConstructors, nFields);
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	iclModule	= icl->beicl_module;
	iclModule->im_name			= moduleNameSymbol;
	iclModule->im_def_module	= NULL;
	iclModule->im_rules			= NULL;
	iclModule->im_start			= NULL;
	iclModule->im_symbols		= gBEState.be_allSymbols;
# if IMPORT_OBJ_AND_LIB
	iclModule->im_imported_objs	= NULL;
	iclModule->im_imported_libs	= NULL;
# endif

	CurrentModule	= cName;

	for (i = 0; i < ArraySize (gLocallyGeneratedFunctions); i++)
	{
		static void	DeclareFunctionC (char *name, int arity, int functionIndex, unsigned int ancestor);
		BELocallyGeneratedFunctionP	locallyGeneratedFunction;

		locallyGeneratedFunction	= &gLocallyGeneratedFunctions [i];

		DeclareFunctionC (locallyGeneratedFunction->lgf_name, locallyGeneratedFunction->lgf_arity, nFunctions-ArraySize(gLocallyGeneratedFunctions)+i, UINT_MAX);
	}

	/* +++ hack */
	{
		static BESymbolP CreateDictionarySelectFunSymbol (void);
		static BESymbolP CreateDictionaryUpdateFunSymbol (void);

		gBEState.be_dictionarySelectFunSymbol	= CreateDictionarySelectFunSymbol ();
		gBEState.be_dictionaryUpdateFunSymbol	= CreateDictionaryUpdateFunSymbol ();
	}
} /* BEDeclareIclModule */

void
BEDeclareDclModule (int moduleIndex, CleanString name, int isSystemModule, int nFunctions, int nTypes, int nConstructors, int nFields)
{
	char	*cName;
	SymbolP	moduleNameSymbol;
	DefMod	dclModule;
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	SymbolP	saveSymbols;
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	cName	= ConvertCleanString (name);

	moduleNameSymbol	= ConvertAllocType (SymbolS);
	moduleNameSymbol->symb_ident	= Identifier (cName);

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	if (moduleIndex == main_dcl_module_n)
	{
		saveSymbols	= gBEState.be_allSymbols;
		gBEState.be_allSymbols	= NULL;
	}

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	DeclareModule (moduleIndex, cName, isSystemModule, nFunctions, nTypes, nConstructors, nFields);

	dclModule	= ConvertAllocType (DefRepr);
	dclModule->dm_name			= moduleNameSymbol;
	dclModule->dm_system_module	= isSystemModule;
	dclModule->dm_symbols		= gBEState.be_allSymbols; /* ??? too many symbols? */

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	AddOpenDefinitionModule (moduleNameSymbol, dclModule);

	if (moduleIndex == main_dcl_module_n)
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		gBEState.be_allSymbols	= saveSymbols;
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} /* BEDeclareDclModule */

void
BEDeclarePredefinedModule (int nTypes, int nConstructors)
{
	char	*cName;

	cName	= "_predef";

	DeclareModule (kPredefinedModuleIndex, cName, False, 0, nTypes, nConstructors, 0);
} /* BEDeclarePredefinedModule */

void
BEDeclareModules (int nModules)
{
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	int	i;

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	Assert (gBEState.be_modules == NULL);

	gBEState.be_nModules	= (unsigned int) nModules;
	gBEState.be_modules		= (BEModuleP) ConvertAlloc (nModules * sizeof (BEModuleS));
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	for (i = 0; i < nModules; i++)
		gBEState.be_modules [i].bem_name	= NULL;
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} /* BEDeclareModules */

BESymbolP
BEFunctionSymbol (int functionIndex, int moduleIndex)
{
	BEModuleP	module;
	SymbolP		functionSymbol;

	Assert ((unsigned int) moduleIndex < gBEState.be_nModules);
	module	= &gBEState.be_modules [moduleIndex];

	Assert ((unsigned int) functionIndex < module->bem_nFunctions);
	functionSymbol	= &module->bem_functions [functionIndex];
	Assert (functionSymbol->symb_kind == definition
				|| (moduleIndex == kPredefinedModuleIndex && functionSymbol->symb_kind != erroneous_symb));

	functionSymbol->symb_def->sdef_isused	= True;

	return (functionSymbol);
} /* BEFunctionSymbol */

static void
GetArrayFunctionType (SymbDefP sdef, TypeNode *elementTypeP, TypeNode *arrayTypeP)
{
	TypeAlt		*typeAlt;

	typeAlt	= sdef->sdef_rule_type->rule_type_rule;

	switch (sdef->sdef_arfun)
	{
		case BEArraySelectFun:
		case BEUnqArraySelectFun:
		case BE_UnqArraySelectFun:
		case BE_UnqArraySelectNextFun:
		case BE_UnqArraySelectLastFun:
			break;
		case BEArrayUpdateFun:
		case BE_ArrayUpdateFun:
			Assert (typeAlt->type_alt_lhs->type_node_arity == 3);
			*elementTypeP	= typeAlt->type_alt_lhs->type_node_arguments->type_arg_next->type_arg_next->type_arg_node;
			*arrayTypeP	= typeAlt->type_alt_lhs->type_node_arguments->type_arg_node;
			break;
		default:
			*elementTypeP	= NULL;
			*arrayTypeP		= NULL;
			break;
	}
} /* GetArrayFunctionType */

BESymbolP
BESpecialArrayFunctionSymbol (BEArrayFunKind arrayFunKind, int functionIndex, int moduleIndex)
{
	Bool		isSpecialArrayFunction;
	BEModuleP	module;
	SymbolP		functionSymbol;
	SymbDefP	sdef;
	SymbDefP	originalsdef;
	TypeAlt		*typeAlt;
	TypeNode	elementType, arrayType;

	Assert ((unsigned int) moduleIndex < gBEState.be_nModules);
	module	= &gBEState.be_modules [moduleIndex];

	Assert ((unsigned int) functionIndex < module->bem_nFunctions);
	functionSymbol	= &module->bem_functions [functionIndex];
	Assert (functionSymbol->symb_kind == definition
				|| (moduleIndex == kPredefinedModuleIndex && functionSymbol->symb_kind != erroneous_symb));

	originalsdef	= functionSymbol->symb_def;

	typeAlt	= originalsdef->sdef_rule_type->rule_type_rule;
	isSpecialArrayFunction	= False;
	switch (arrayFunKind)
	{
		case BEArraySelectFun:
			Assert (originalsdef->sdef_arfun == BEArraySelectFun || originalsdef->sdef_arfun == BEUnqArraySelectFun);
			break;
		case BE_UnqArraySelectFun:
		case BE_UnqArraySelectLastFun:
			Assert (typeAlt->type_alt_lhs->type_node_arity == 2);
			elementType	= typeAlt->type_alt_rhs;
			arrayType	= typeAlt->type_alt_lhs->type_node_arguments->type_arg_node;

			isSpecialArrayFunction	= True;
			Assert (originalsdef->sdef_arfun == BEArraySelectFun);
			break;
		case BE_ArrayUpdateFun:
			isSpecialArrayFunction	= True;
			elementType	= typeAlt->type_alt_lhs->type_node_arguments->type_arg_next->type_arg_next->type_arg_node;
			arrayType	= typeAlt->type_alt_lhs->type_node_arguments->type_arg_node;
			/* fall through! */
		case BEArrayUpdateFun:
			Assert (originalsdef->sdef_arfun == BEArrayUpdateFun);
			break;
		default:
			Assert (False);
			break;
	}

	if (isSpecialArrayFunction)
	{
		SymbolP	previousFunctionSymbol;
		Bool	allreadyCreated;

		previousFunctionSymbol	= functionSymbol;
		functionSymbol	= functionSymbol->symb_next;

		allreadyCreated	= False;
		if (functionSymbol != NULL && functionSymbol->symb_kind == definition)
		{
			sdef			= functionSymbol->symb_def;
			allreadyCreated	= sdef->sdef_arfun == (ArrayFunKind) arrayFunKind;
			if (!allreadyCreated && arrayFunKind == BE_UnqArraySelectLastFun && sdef->sdef_arfun == BE_UnqArraySelectFun)
			{
				previousFunctionSymbol	= functionSymbol;
				functionSymbol	= functionSymbol->symb_next;
	
				if (functionSymbol != NULL && functionSymbol->symb_kind == definition)
				{
					sdef			= functionSymbol->symb_def;
					allreadyCreated	= sdef->sdef_arfun == (ArrayFunKind) arrayFunKind;
				}
			}
		}

		if (!allreadyCreated)
		{
			char		*functionName, *functionPrefix;
			TypeAlt		*newTypeAlt;
			IdentP		newIdent;
			SymbDefP	newsdef;
			SymbolP		newFunctionSymbol;
			RuleTypes	newRuleType;
			TypeArgs	lhsArgs;
			TypeNode	rhs;

			newFunctionSymbol	= ConvertAllocType (SymbolS);
			newsdef				= ConvertAllocType (SymbDefS);
			newIdent			= ConvertAllocType (IdentS);

			newTypeAlt	= ConvertAllocType (TypeAlt);

			newTypeAlt->type_alt_type_context	= NULL;	/* used in PrintType */
			newTypeAlt->type_alt_attr_equations	= NULL; /* used in PrintType */

			Assert (!arrayType->type_node_is_var);
			switch (arrayType->type_node_symbol->symb_kind)
			{
				case strict_array_type:
				case unboxed_array_type:
					elementType->type_node_annotation	= StrictAnnot;
					break;
				case array_type:
					break;
				default:
					Assert (False);
					break;
			}

			switch (arrayFunKind)
			{
				case BE_UnqArraySelectFun:
					rhs	= BENormalTypeNode (gBasicSymbols [tuple_type],
												BETypeArgs (elementType, BETypeArgs (arrayType, NULL)));
					lhsArgs	= BETypeArgs (arrayType, BETypeArgs (BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [int_type], NULL)), NULL));
					functionPrefix	= "_uselectf";
					break;
				case BE_UnqArraySelectLastFun:
				{
					struct clean_string	rName = {1, 'r'};
					TypeNode			rType;

					rType	= BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&rName));
					rhs	= BENormalTypeNode (gBasicSymbols [tuple_type],
												BETypeArgs (elementType, BETypeArgs (rType, NULL)));
					lhsArgs	= BETypeArgs (
								BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [tuple_type],
										BETypeArgs (arrayType, BETypeArgs (rType, NULL)))),
								BETypeArgs (BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [int_type], NULL)), NULL));
					functionPrefix	= "_uselectl";
					break;
				}
				case BE_ArrayUpdateFun:
				{
					struct clean_string	rName = {1, 'r'};
					TypeNode			rType;

					rType	= BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&rName));
					rhs	= rType;
					lhsArgs	= BETypeArgs (
								BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [tuple_type],
										BETypeArgs (arrayType, BETypeArgs (rType, NULL)))),
								BETypeArgs (BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [int_type], NULL)),
								BETypeArgs (elementType,
								NULL)));
					functionPrefix	= "_updatei";
					break;
				}
				default:
					Assert (False);
					break;
			}

			functionName	= ConvertAlloc (strlen (functionPrefix) + 1 + strlen (originalsdef->sdef_ident->ident_name) + 1);
			strcpy (functionName, functionPrefix);
			strcat (functionName, ";");
			strcat (functionName, originalsdef->sdef_ident->ident_name);

			newTypeAlt->type_alt_lhs	= BENormalTypeNode (newFunctionSymbol, lhsArgs);
			newTypeAlt->type_alt_rhs	= rhs;

			newIdent->ident_symbol	= newFunctionSymbol;
			newIdent->ident_name	= functionName;

			newRuleType	= ConvertAllocType (struct rule_type);
			newRuleType->rule_type_rule	= newTypeAlt;

			newsdef->sdef_ident			= newIdent;
			newsdef->sdef_module		= gBEState.be_icl.beicl_module->im_name->symb_def->sdef_module; /* phew! */
			newsdef->sdef_over_arity	= 0;
			newsdef->sdef_isused		= True;
			newsdef->sdef_exported		= False;
			newsdef->sdef_arity			= newTypeAlt->type_alt_lhs->type_node_arity;
			newsdef->sdef_arfun			= arrayFunKind;
			newsdef->sdef_kind 			= SYSRULE;
			newsdef->sdef_rule_type		= newRuleType;
			newsdef->sdef_ident			= newIdent;
			newsdef->sdef_mark			= 0;

			newFunctionSymbol->symb_kind	= definition;
			newFunctionSymbol->symb_def		= newsdef;

			functionSymbol						= previousFunctionSymbol->symb_next;
			previousFunctionSymbol->symb_next	= newFunctionSymbol;
			newFunctionSymbol->symb_next		= functionSymbol;

			AddUserDefinedArrayFunction (newFunctionSymbol);

			functionSymbol	= newFunctionSymbol;
		}

	}

	return (functionSymbol);
} /* BESpecialArrayFunctionSymbol */

static SymbolP
CreateLocallyDefinedFunction (int index, char ** abcCode, TypeArgs lhsArgs, TypeNode rhsType)
{
	int				i, arity, functionIndex;
	NodeP			lhs;
	BEStringListP	instructions, *instructionsP;
	BECodeBlockP	codeBlock;
	RuleAltP		ruleAlt;
	SymbolP			functionSymbol;
	TypeAlt			*typeAlt;
	ArgP			args;

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	functionIndex	= gBEState.be_modules[main_dcl_module_n].bem_nFunctions - ArraySize (gLocallyGeneratedFunctions) + index;
	functionSymbol	= BEFunctionSymbol (functionIndex, main_dcl_module_n);
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	functionSymbol->symb_def->sdef_isused	= False;

	instructionsP	= &instructions;
	for (i = 0; abcCode [i] != NULL; i++)
	{
		BEStringListP	string;

		string	= ConvertAllocType (struct string_list);

		string->sl_string	= abcCode [i];
		string->sl_next		= instructions;

		*instructionsP	= string;
		instructionsP	= &string->sl_next;
	}
	*instructionsP	=	NULL;

	codeBlock	= BEAbcCodeBlock (False, instructions);
		
	lhs		= BENormalNode (functionSymbol, NULL);
	arity	= CountTypeArgs (lhsArgs);

	args	= NULL;
	for (i = 0; i < arity; i++)
		args	= BEArgs (BENodeIdNode (BEWildCardNodeId (), NULL), args);

	lhs->node_arguments	= args;
	lhs->node_arity		= arity;

	Assert (arity == functionSymbol->symb_def->sdef_arity);

	ruleAlt		= BECodeAlt (0, NULL, lhs, codeBlock);

	typeAlt	= ConvertAllocType (TypeAlt);

	typeAlt->type_alt_type_context	= NULL;	/* used in PrintType */
	typeAlt->type_alt_attr_equations	= NULL; /* used in PrintType */
	typeAlt->type_alt_lhs	= BENormalTypeNode (functionSymbol, lhsArgs);
	typeAlt->type_alt_rhs	= rhsType;

	BERule (functionIndex, BEIsNotACaf, typeAlt, ruleAlt);
	
	return (functionSymbol);
} /* CreateLocallyDefinedFunction */

static BESymbolP
CreateDictionarySelectFunSymbol (void)
{
	TypeNode		rhsType;
	TypeArgs		lhsArgs;
	struct clean_string	aName = {1, 'a'};

	/* selectl :: !((a e) Int -> e) !(!a e, !r) !Int -> (e, !r) */
	/* select _ _ _ = code */
	static char *abcCode[] = {
		"push_a 1",
		"push_a 1",
		"build e_system_dAP 2 e_system_nAP",
		"buildI_b 0",
		"push_a 1",
		"update_a 1 2",
		"update_a 0 1",
		"pop_a 1",
		"build e_system_dAP 2 e_system_nAP",
		"push_a 3",
		"push_a 1",
		"update_a 1 2",
		"update_a 0 1",
		"pop_a 1",
		"update_a 1 4",
		"update_a 0 3",
		"pop_a 3",
		"pop_b 1",
		NULL
	};

	/*	actual type simplified to !a !(!a,!a) !Int -> (a,!a) */
	lhsArgs	=	BETypeArgs (
					BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)),
				BETypeArgs (
					BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [tuple_type],
								BETypeArgs (
									BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)),
								BETypeArgs (
									BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)),
								NULL)))),
				BETypeArgs (
					BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [int_type], NULL)),
				NULL)));
	rhsType	= BENormalTypeNode (gBasicSymbols [tuple_type],
								BETypeArgs (BEVarTypeNode (&aName), BETypeArgs (BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)), NULL)));

	return (CreateLocallyDefinedFunction (kDictionarySelect, abcCode, lhsArgs, rhsType));
} /* CreateDictionarySelectFunSymbol */

static BESymbolP
CreateDictionaryUpdateFunSymbol (void)
{
	TypeNode		rhsType;
	TypeArgs		lhsArgs;
	struct clean_string	aName = {1, 'a'};

	/* updatei :: !(*(a .e) -> *(!Int -> *(.e -> .(a .e)))) !(!*(a .e), !*r) !Int .e -> *r // !(!.(a .e), !*r) */
	/* updatei _ _ _ _ = code */
	static char *abcCode[] = {
		"	push_a 1",
		"	push_a 1",
		"	build _Nil 0 _hnf",
		"	update_a 0 4",
		"	pop_a 1",
		".d 2 0",
		"	jsr e_system_sAP",
		".o 1 0",
		"	buildI_b 0",
		"	push_a 1",
		"	update_a 1 2",
		"	update_a 0 1",
		"	pop_a 1",
		"	pop_b 1",
		".d 2 0",
		"	jsr e_system_sAP",
		".o 1 0",
		"	push_a 4",
		"	push_a 1",
		"	update_a 1 2",
		"	update_a 0 1",
		"	pop_a 1",
		"	build _Nil 0 _hnf",
		"	update_a 0 6",
		"	pop_a 1",
		".d 2 0",
		"	jsr e_system_sAP",
		".o 1 0",
		"	update_a 3 4",
		"	pop_a 4",
		NULL
	};

	/*	actual type simplified to !a !(!a,!a) !Int a -> a */
	lhsArgs	=	BETypeArgs (
					BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)),
				BETypeArgs (
					BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [tuple_type],
								BETypeArgs (
									BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)),
								BETypeArgs (
									BEAnnotateTypeNode (StrictAnnot, BEVarTypeNode (&aName)),
								NULL)))),
				BETypeArgs (
					BEAnnotateTypeNode (StrictAnnot, BENormalTypeNode (gBasicSymbols [int_type], NULL)),
				BETypeArgs (
					BEVarTypeNode (&aName),
				NULL))));

	rhsType	= BEVarTypeNode (&aName);

	return (CreateLocallyDefinedFunction (kDictionaryUpdate, abcCode, lhsArgs, rhsType));
} /* CreateDictionaryUpdateFunSymbol */

BESymbolP
BEDictionarySelectFunSymbol (void)
{
	gBEState.be_dictionarySelectFunSymbol->symb_def->sdef_isused	= True;

	return (gBEState.be_dictionarySelectFunSymbol);
} /* BEDictionarySelectFunSymbol */

BESymbolP
BEDictionaryUpdateFunSymbol (void)
{
	gBEState.be_dictionaryUpdateFunSymbol->symb_def->sdef_isused	= True;

	return (gBEState.be_dictionaryUpdateFunSymbol);
} /* BEDictionaryUpdateFunSymbol */

BESymbolP
BETypeSymbol (int typeIndex, int moduleIndex)
{
	BEModuleP	module;
	SymbolP		typeSymbol;

	if ((unsigned int) moduleIndex >= gBEState.be_nModules)
		Assert ((unsigned int) moduleIndex < gBEState.be_nModules);
	module	= &gBEState.be_modules [moduleIndex];

	Assert ((unsigned int) typeIndex < module->bem_nTypes);
	typeSymbol	= module->bem_types [typeIndex];
/*	Assert (typeSymbol->symb_kind == definition
				|| (moduleIndex == kPredefinedModuleIndex && typeSymbol->symb_kind != erroneous_symb));
*/
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	if (moduleIndex == main_dcl_module_n)
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		typeSymbol->symb_def->sdef_isused	= True;

	return (typeSymbol);
} /* BETypeSymbol */

BESymbolP
BEDontCareDefinitionSymbol (void)
{
	SymbolP	symbol;

	symbol	= gBEState.be_dontCareSymbol;
	if (symbol == NULL)
	{
		SymbDefP	symbDef;

		symbDef	= ConvertAllocType (SymbDefS);
		symbDef->sdef_kind	= ABSTYPE;

		symbDef->sdef_ident	= Identifier ("_Don'tCare"); /* +++ name */

		symbol	= ConvertAllocType (SymbolS);
		symbol->symb_kind	= definition;
		symbol->symb_def	= symbDef;

		gBEState.be_dontCareSymbol	= symbol;
	}

	return (symbol);
} /* BEDontCareDefinitionSymbol */

BESymbolP
BEConstructorSymbol (int constructorIndex, int moduleIndex)
{
	BEModuleP	module;
	SymbolP		constructorSymbol;

	Assert ((unsigned int) moduleIndex < gBEState.be_nModules);
	module	= &gBEState.be_modules [moduleIndex];

	Assert ((unsigned int) constructorIndex < module->bem_nConstructors);
	constructorSymbol	= module->bem_constructors [constructorIndex];

	/* RWS +++ hack for record constructors, remove this */
	if (constructorSymbol->symb_kind == erroneous_symb)
		return (constructorSymbol);

	Assert (constructorSymbol->symb_kind == definition
				|| (moduleIndex == kPredefinedModuleIndex && constructorSymbol->symb_kind != erroneous_symb));

	if (moduleIndex != kPredefinedModuleIndex)
		constructorSymbol->symb_def->sdef_isused	= True;

	return (constructorSymbol);
} /* BEConstructorSymbol */

BESymbolP
BEFieldSymbol (int fieldIndex, int moduleIndex)
{
	BEModuleP	module;
	SymbolP		fieldSymbol;

	Assert ((unsigned int) moduleIndex < gBEState.be_nModules);
	module	= &gBEState.be_modules [moduleIndex];

	Assert ((unsigned int) fieldIndex < module->bem_nFields);
	fieldSymbol	= &module->bem_fields [fieldIndex];
	Assert (fieldSymbol->symb_kind == definition);

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