//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// cfa.y -- 
// 
// Author           : Peter A. Buhr
// Created On       : Sat Sep  1 20:22:55 2001
// Last Modified By : Peter A. Buhr
// Last Modified On : Mon Sep 28 18:18:32 2015
// Update Count     : 1402
// 

// This grammar is based on the ANSI99/11 C grammar, specifically parts of EXPRESSION and STATEMENTS, and on the C
// grammar by James A. Roskind, specifically parts of DECLARATIONS and EXTERNAL DEFINITIONS.  While parts have been
// copied, important changes have been made in all sections; these changes are sufficient to constitute a new grammar.
// In particular, this grammar attempts to be more syntactically precise, i.e., it parses less incorrect language syntax
// that must be subsequently rejected by semantic checks.  Nevertheless, there are still several semantic checks
// required and many are noted in the grammar. Finally, the grammar is extended with GCC and CFA language extensions.

// Acknowledgments to Richard Bilson, Glen Ditchfield, and Rodolfo Gabriel Esteves who all helped when I got stuck with
// the grammar.

// The root language for this grammar is ANSI99/11 C. All of ANSI99/11 is parsed, except for:
//
// 1. designation with '=' (use ':' instead)
//
// Most of the syntactic extensions from ANSI90 to ANSI11 C are marked with the comment "C99/C11". This grammar also has
// two levels of extensions. The first extensions cover most of the GCC C extensions, except for:
//
// 1. nested functions
// 2. generalized lvalues
// 3. designation with and without '=' (use ':' instead)
// 4. attributes not allowed in parenthesis of declarator
//
// All of the syntactic extensions for GCC C are marked with the comment "GCC". The second extensions are for Cforall
// (CFA), which fixes several of C's outstanding problems and extends C with many modern language concepts. All of the
// syntactic extensions for CFA C are marked with the comment "CFA". As noted above, there is one unreconcileable
// parsing problem between C99 and CFA with respect to designators; this is discussed in detail before the "designation"
// grammar rule.

%{
#define YYDEBUG_LEXER_TEXT (yylval)						// lexer loads this up each time
#define YYDEBUG 1										// get the pretty debugging code to compile
extern char *yytext;

#undef __GNUC_MINOR__

#include <cstdio>
#include <stack>
#include "TypedefTable.h"
#include "lex.h"
#include "ParseNode.h"
#include "TypeData.h"
#include "LinkageSpec.h"

DeclarationNode *theTree = 0;							// the resulting parse tree
LinkageSpec::Type linkage = LinkageSpec::Cforall;
std::stack< LinkageSpec::Type > linkageStack;
TypedefTable typedefTable;
%}

//************************* TERMINAL TOKENS ********************************

// keywords
%token TYPEDEF
%token AUTO EXTERN REGISTER STATIC
%token INLINE											// C99
%token FORTRAN											// C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
%token CONST VOLATILE
%token RESTRICT											// C99
%token FORALL LVALUE									// CFA
%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED
%token BOOL COMPLEX IMAGINARY							// C99
%token TYPEOF LABEL										// GCC
%token ENUM STRUCT UNION
%token TYPE FTYPE DTYPE CONTEXT							// CFA
%token SIZEOF
%token ATTRIBUTE EXTENSION								// GCC
%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
%token CHOOSE DISABLE ENABLE FALLTHRU TRY CATCH CATCHRESUME FINALLY THROW THROWRESUME AT	// CFA
%token ASM												// C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
%token ALIGNAS ALIGNOF ATOMIC GENERIC NORETURN STATICASSERT THREADLOCAL // C11

// names and constants: lexer differentiates between identifier and typedef names
%token<tok> IDENTIFIER			QUOTED_IDENTIFIER		TYPEDEFname				TYPEGENname
%token<tok> ATTR_IDENTIFIER		ATTR_TYPEDEFname		ATTR_TYPEGENname
%token<tok> INTEGERconstant		FLOATINGconstant		CHARACTERconstant		STRINGliteral
%token<tok> ZERO				ONE						// CFA

// multi-character operators
%token ARROW											// ->
%token ICR DECR											// ++	--
%token LS RS											// <<	>>
%token LE GE EQ NE										// <=	>=	==	!=
%token ANDAND OROR										// &&	||
%token ELLIPSIS											// ...

%token MULTassign	DIVassign	MODassign				// *=	/=	%=/
%token PLUSassign	MINUSassign							// +=	-=
%token LSassign		RSassign							// <<=	>>=
%token ANDassign	ERassign	ORassign				// &=	^=	|=

// Types declaration
%union
{
	Token tok;
	ParseNode *pn;
	ExpressionNode *en;
	DeclarationNode *decl;
	DeclarationNode::Aggregate aggKey;
	DeclarationNode::TypeClass tclass;
	StatementNode *sn;
	ConstantNode *constant;
	LabelNode *label;
	InitializerNode *in;
	bool flag;
}

%type<tok> identifier  no_01_identifier  no_attr_identifier no_attr_identifier_01  zero_one
%type<tok> identifier_or_type_name  no_attr_identifier_or_type_name  no_01_identifier_or_type_name
%type<constant> string_literal_list

// expressions
%type<constant> constant
%type<en> tuple							tuple_expression_list
%type<en> unary_operator				assignment_operator
%type<en> primary_expression			postfix_expression			unary_expression
%type<en> cast_expression				multiplicative_expression	additive_expression			shift_expression
%type<en> relational_expression			equality_expression			AND_expression				exclusive_OR_expression
%type<en> inclusive_OR_expression		logical_AND_expression		logical_OR_expression		conditional_expression
%type<en> constant_expression			assignment_expression		assignment_expression_opt
%type<en> comma_expression				comma_expression_opt
%type<en> argument_expression_list		argument_expression			for_control_expression		assignment_opt
%type<en> subrange
%type<en> asm_operands_opt asm_operands_list asm_operand
%type<label> label_list
%type<constant> asm_clobbers_list_opt
%type<flag> asm_volatile_opt

// statements
%type<sn> labeled_statement				compound_statement			expression_statement		selection_statement
%type<sn> iteration_statement			jump_statement				exception_statement			asm_statement			ctor_dtor
%type<sn> fall_through_opt				fall_through
%type<sn> statement						statement_list
%type<sn> block_item_list				block_item
%type<sn> case_clause
%type<en> case_value					case_value_list
%type<sn> case_label					case_label_list
%type<sn> switch_clause_list_opt		switch_clause_list			choose_clause_list_opt		choose_clause_list
%type<pn> handler_list					handler_clause				finally_clause

// declarations
%type<decl> abstract_array abstract_declarator abstract_function abstract_parameter_array
%type<decl> abstract_parameter_declaration abstract_parameter_declarator abstract_parameter_function
%type<decl> abstract_parameter_ptr abstract_ptr

%type<aggKey> aggregate_key
%type<decl>  aggregate_name

%type<decl> array_dimension array_parameter_1st_dimension array_parameter_dimension multi_array_dimension

%type<decl> assertion assertion_list_opt

%type<en>   bit_subrange_size_opt bit_subrange_size

%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type_name indirect_type_name

%type<decl> context_declaration context_declaration_list context_declaring_list context_specifier

%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
%type<decl> declaration_specifier declarator declaring_list

%type<decl> elaborated_type_name

%type<decl> enumerator_list enum_name
%type<en> enumerator_value_opt

%type<decl> exception_declaration external_definition external_definition_list external_definition_list_opt

%type<decl> field_declaration field_declaration_list field_declarator field_declaring_list
%type<en> field field_list

%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr

%type<decl> identifier_parameter_array identifier_parameter_declarator identifier_parameter_function
%type<decl> identifier_parameter_ptr identifier_list

%type<decl> new_abstract_array new_abstract_declarator_no_tuple new_abstract_declarator_tuple
%type<decl> new_abstract_function new_abstract_parameter_declaration new_abstract_parameter_list
%type<decl> new_abstract_ptr new_abstract_tuple

%type<decl> new_array_parameter_1st_dimension

%type<decl> new_context_declaring_list new_declaration new_field_declaring_list
%type<decl> new_function_declaration new_function_return new_function_specifier

%type<decl> new_identifier_parameter_array new_identifier_parameter_declarator_no_tuple
%type<decl> new_identifier_parameter_declarator_tuple new_identifier_parameter_ptr

%type<decl> new_parameter_declaration new_parameter_list new_parameter_type_list new_parameter_type_list_opt

%type<decl> new_typedef_declaration new_variable_declaration new_variable_specifier

%type<decl> old_declaration old_declaration_list old_declaration_list_opt old_function_array
%type<decl> old_function_declarator old_function_no_ptr old_function_ptr

%type<decl> parameter_declaration parameter_list parameter_type_list
%type<decl> parameter_type_list_opt

%type<decl> paren_identifier paren_type

%type<decl> storage_class storage_class_name storage_class_list

%type<decl> sue_declaration_specifier sue_type_specifier

%type<tclass> type_class
%type<decl> type_declarator type_declarator_name type_declaring_list

%type<decl> typedef type_array typedef_declaration typedef_declaration_specifier typedef_expression
%type<decl> type_function type_parameter_array type_parameter_function type_parameter_ptr
%type<decl> type_parameter_redeclarator type_ptr type_redeclarator typedef_type_specifier
%type<decl> typegen_declaration_specifier typegen_type_specifier typegen_name

%type<decl> type_name type_name_no_function
%type<decl> type_parameter type_parameter_list

%type<en> type_name_list

%type<decl> type_qualifier type_qualifier_name type_qualifier_list type_qualifier_list_opt type_specifier

%type<decl> variable_abstract_array variable_abstract_declarator variable_abstract_function
%type<decl> variable_abstract_ptr variable_array variable_declarator variable_function variable_ptr

%type<decl> attribute_list_opt attribute_list attribute

// initializers
%type<in>  initializer initializer_list initializer_opt

// designators
%type<en>  designator designator_list designation


// Handle single shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string
// is ambiguous:
// .---------.				matches IF '(' comma_expression ')' statement
// if ( C ) S1 else S2
// `-----------------'		matches IF '(' comma_expression ')' statement ELSE statement */

%nonassoc THEN	// rule precedence for IF '(' comma_expression ')' statement
%nonassoc ELSE	// token precedence for start of else clause in IF statement

%start translation_unit									// parse-tree root

%%
//************************* Namespace Management ********************************

// The grammar in the ANSI C standard is not strictly context-free, since it relies upon the distinct terminal symbols
// "identifier" and "TYPEDEFname" that are lexically identical.  While it is possible to write a purely context-free
// grammar, such a grammar would obscure the relationship between syntactic and semantic constructs.  Hence, this
// grammar uses the ANSI style.
//
// Cforall compounds this problem by introducing type names local to the scope of a declaration (for instance, those
// introduced through "forall" qualifiers), and by introducing "type generators" -- parametrized types.  This latter
// type name creates a third class of identifiers that must be distinguished by the scanner.
//
// Since the scanner cannot distinguish among the different classes of identifiers without some context information, it
// accesses a data structure (the TypedefTable) to allow classification of an identifier that it has just read.
// Semantic actions during the parser update this data structure when the class of identifiers change.
//
// Because the Cforall language is block-scoped, there is the possibility that an identifier can change its class in a
// local scope; it must revert to its original class at the end of the block.  Since type names can be local to a
// particular declaration, each declaration is itself a scope.  This requires distinguishing between type names that are
// local to the current declaration scope and those that persist past the end of the declaration (i.e., names defined in
// "typedef" or "type" declarations).
//
// The non-terminals "push" and "pop" derive the empty string; their only use is to denote the opening and closing of
// scopes.  Every push must have a matching pop, although it is regrettable the matching pairs do not always occur
// within the same rule.  These non-terminals may appear in more contexts than strictly necessary from a semantic point
// of view.  Unfortunately, these extra rules are necessary to prevent parsing conflicts -- the parser may not have
// enough context and look-ahead information to decide whether a new scope is necessary, so the effect of these extra
// rules is to open a new scope unconditionally.  As the grammar evolves, it may be neccesary to add or move around
// "push" and "pop" nonterminals to resolve conflicts of this sort.

push:
		{
			typedefTable.enterScope();
		}
	;

pop:
		{
			typedefTable.leaveScope();
		}
	;

//************************* CONSTANTS ********************************

constant:
		// ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
	INTEGERconstant								{ $$ = new ConstantNode( ConstantNode::Integer, $1 ); }
	| FLOATINGconstant							{ $$ = new ConstantNode( ConstantNode::Float, $1 ); }
	| CHARACTERconstant							{ $$ = new ConstantNode( ConstantNode::Character, $1 ); }
	;

identifier:
	IDENTIFIER
	| ATTR_IDENTIFIER									// CFA
	| zero_one											// CFA
	;

no_01_identifier:
	IDENTIFIER
	| ATTR_IDENTIFIER									// CFA
	;

no_attr_identifier:
	IDENTIFIER
	;

no_attr_identifier_01:
	IDENTIFIER
	| zero_one
	;

zero_one:												// CFA
	ZERO
	| ONE
	;

string_literal_list:									// juxtaposed strings are concatenated
	STRINGliteral								{ $$ = new ConstantNode( ConstantNode::String, $1 ); }
	| string_literal_list STRINGliteral			{ $$ = $1->appendstr( $2 ); }
	;

//************************* EXPRESSIONS ********************************

primary_expression:
	IDENTIFIER											// typedef name cannot be used as a variable name
		{ $$ = new VarRefNode( $1 ); }
	| zero_one
		{ $$ = new VarRefNode( $1 ); }
	| '(' comma_expression ')'
		{ $$ = $2; }
	| '(' compound_statement ')'						// GCC, lambda expression
		{ $$ = new ValofExprNode( $2 ); }
	;

postfix_expression:
	primary_expression
	| postfix_expression '[' push assignment_expression pop ']'
		// CFA, comma_expression disallowed in the context because it results in a commom user error: subscripting a
		// matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
		// little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
		// equivalent to the old x[i,j].
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Index ), $1, $4 ); }
	| postfix_expression '(' argument_expression_list ')'
		{ $$ = new CompositeExprNode( $1, $3 ); }
	| postfix_expression '.' no_attr_identifier
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::FieldSel ), $1, new VarRefNode( $3 )); }
	| postfix_expression '.' '[' push field_list pop ']' // CFA, tuple field selector
	| postfix_expression ARROW no_attr_identifier
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::PFieldSel ), $1, new VarRefNode( $3 )); }
	| postfix_expression ARROW '[' push field_list pop ']' // CFA, tuple field selector
	| postfix_expression ICR
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::IncrPost ), $1 ); }
	| postfix_expression DECR
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::DecrPost ), $1 ); }
		// GCC has priority: cast_expression
	| '(' type_name_no_function ')' '{' initializer_list comma_opt '}' // C99
		{ $$ = 0; }
	;

argument_expression_list:
	argument_expression
	| argument_expression_list ',' argument_expression
		{ $$ = (ExpressionNode *)( $1->set_link( $3 )); }
	;

argument_expression:
	// empty
		{ $$ = 0; }										// use default argument
	| assignment_expression
	| no_attr_identifier ':' assignment_expression
		{ $$ = $3->set_argName( $1 ); }
		// Only a list of no_attr_identifier_or_type_name is allowed in this context. However, there is insufficient
		// look ahead to distinguish between this list of parameter names and a tuple, so the tuple form must be used
		// with an appropriate semantic check.
	| '[' push assignment_expression pop ']' ':' assignment_expression
		{ $$ = $7->set_argName( $3 ); }
	| '[' push assignment_expression ',' tuple_expression_list pop ']' ':' assignment_expression
		{ $$ = $9->set_argName( new CompositeExprNode( new OperatorNode( OperatorNode::TupleC ), (ExpressionNode *)$3->set_link( flattenCommas( $5 )))); }
	;

field_list:												// CFA, tuple field selector
	field
	| field_list ',' field						{ $$ = (ExpressionNode *)$1->set_link( $3 ); }
	;

field:													// CFA, tuple field selector
	no_attr_identifier
		{ $$ = new VarRefNode( $1 ); }
	| no_attr_identifier '.' field
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::FieldSel ), new VarRefNode( $1 ), $3 ); }
	| no_attr_identifier '.' '[' push field_list pop ']'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::FieldSel ), new VarRefNode( $1 ), $5 ); }
	| no_attr_identifier ARROW field
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::PFieldSel ), new VarRefNode( $1 ), $3 ); }
	| no_attr_identifier ARROW '[' push field_list pop ']'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::PFieldSel ), new VarRefNode( $1 ), $5 ); }
	;

unary_expression:
	postfix_expression
	// first location where constant/string can have operator applied: sizeof 3/sizeof "abc"
	// still requires semantics checks, e.g., ++3, 3--, *3, &&3
	| constant
		{ $$ = $1; }
	| string_literal_list
		{ $$ = $1; }
	| ICR unary_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Incr ), $2 ); }
	| DECR unary_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Decr ), $2 ); }
	| EXTENSION cast_expression							// GCC
		{ $$ = $2; }
	| unary_operator cast_expression
		{ $$ = new CompositeExprNode( $1, $2 ); }
	| '!' cast_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Neg ), $2 ); }
	| '*' cast_expression								// CFA
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::PointTo ), $2 ); }
		// '*' is is separated from unary_operator because of shift/reduce conflict in:
		//		{ * X; } // dereference X
		//		{ * int X; } // CFA declaration of pointer to int
		// '&' must be moved here if C++ reference variables are supported.
	| SIZEOF unary_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::SizeOf ), $2 ); }
	| SIZEOF '(' type_name_no_function ')'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::SizeOf ), new TypeValueNode( $3 )); }
	| ATTR_IDENTIFIER
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Attr ), new VarRefNode( $1 )); }
	| ATTR_IDENTIFIER '(' type_name ')'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Attr ), new VarRefNode( $1 ), new TypeValueNode( $3 )); }
	| ATTR_IDENTIFIER '(' argument_expression ')'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Attr ), new VarRefNode( $1 ), $3 ); }
	| ALIGNOF unary_expression							// GCC, variable alignment
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::AlignOf ), $2 ); }
	| ALIGNOF '(' type_name_no_function ')'				// GCC, type alignment
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::AlignOf ), new TypeValueNode( $3 ) ); }
	| ANDAND no_attr_identifier							// GCC, address of label
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::LabelAddress ), new VarRefNode( $2, true ) ); }
	;

unary_operator:
	'&'											{ $$ = new OperatorNode( OperatorNode::AddressOf ); }
	| '+'										{ $$ = new OperatorNode( OperatorNode::UnPlus ); }
	| '-'										{ $$ = new OperatorNode( OperatorNode::UnMinus ); }
	| '~'										{ $$ = new OperatorNode( OperatorNode::BitNeg ); }
	;

cast_expression:
	unary_expression
	| '(' type_name_no_function ')' cast_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Cast ), new TypeValueNode( $2 ), $4 ); }
	| '(' type_name_no_function ')' tuple
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Cast ), new TypeValueNode( $2 ), $4 ); }
	;

multiplicative_expression:
	cast_expression
	| multiplicative_expression '*' cast_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Mul ), $1, $3 ); }
	| multiplicative_expression '/' cast_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Div ), $1, $3 ); }
	| multiplicative_expression '%' cast_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Mod ), $1, $3 ); }
	;

additive_expression:
	multiplicative_expression
	| additive_expression '+' multiplicative_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Plus ), $1, $3 ); }
	| additive_expression '-' multiplicative_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Minus ), $1, $3 ); }
	;

shift_expression:
	additive_expression
	| shift_expression LS additive_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::LShift ), $1, $3 ); }
	| shift_expression RS additive_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::RShift ), $1, $3 ); }
	;

relational_expression:
	shift_expression
	| relational_expression '<' shift_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::LThan ), $1, $3 ); }
	| relational_expression '>' shift_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::GThan ), $1, $3 ); }
	| relational_expression LE shift_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::LEThan ), $1, $3 ); }
	| relational_expression GE shift_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::GEThan ), $1, $3 ); }
	;

equality_expression:
	relational_expression
	| equality_expression EQ relational_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Eq ), $1, $3 ); }
	| equality_expression NE relational_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Neq ), $1, $3 ); }
	;

AND_expression:
	equality_expression
	| AND_expression '&' equality_expression
		{ $$ =new CompositeExprNode( new OperatorNode( OperatorNode::BitAnd ), $1, $3 ); }
	;

exclusive_OR_expression:
	AND_expression
	| exclusive_OR_expression '^' AND_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Xor ), $1, $3 ); }
	;

inclusive_OR_expression:
	exclusive_OR_expression
	| inclusive_OR_expression '|' exclusive_OR_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::BitOr ), $1, $3 ); }
	;

logical_AND_expression:
	inclusive_OR_expression
	| logical_AND_expression ANDAND inclusive_OR_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::And ), $1, $3 ); }
	;

logical_OR_expression:
	logical_AND_expression
	| logical_OR_expression OROR logical_AND_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Or ), $1, $3 ); }
	;

conditional_expression:
	logical_OR_expression
	| logical_OR_expression '?' comma_expression ':' conditional_expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Cond ), (ExpressionNode *)mkList( (*$1, *$3, *$5 ) ) ); }
	| logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
		{ $$=new CompositeExprNode( new OperatorNode( OperatorNode::NCond ), $1, $4 ); }
	| logical_OR_expression '?' comma_expression ':' tuple // CFA, tuple expression
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Cond ), (ExpressionNode *)mkList( (*$1, *$3, *$5 ) ) ); }
	;

constant_expression:
	conditional_expression
	;

assignment_expression:
		// CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
	conditional_expression
	| unary_expression '=' assignment_expression
		{ $$ =new CompositeExprNode( new OperatorNode( OperatorNode::Assign ), $1, $3 ); }
	| unary_expression assignment_operator assignment_expression
		{ $$ =new CompositeExprNode( $2, $1, $3 ); }
	| tuple assignment_opt								// CFA, tuple expression
		{ $$ = ( $2 == 0 ) ? $1 : new CompositeExprNode( new OperatorNode( OperatorNode::Assign ), $1, $2 ); }
	;

assignment_expression_opt:
	// empty
		{ $$ = new NullExprNode; }
	| assignment_expression
	;

tuple:													// CFA, tuple
		// CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
		// comma_expression in new_identifier_parameter_array and new_abstract_array
	'[' ']'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::TupleC ) ); }
	| '[' push assignment_expression pop ']'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::TupleC ), $3 ); }
	| '[' push ',' tuple_expression_list pop ']'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::TupleC ), (ExpressionNode *)(new NullExprNode)->set_link( $4 ) ); }
	| '[' push assignment_expression ',' tuple_expression_list pop ']'
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::TupleC ), (ExpressionNode *)$3->set_link( flattenCommas( $5 ) ) ); }
	;

tuple_expression_list:
	assignment_expression_opt
	| tuple_expression_list ',' assignment_expression_opt
		{ $$ = (ExpressionNode *)$1->set_link( $3 ); }
	;

assignment_operator:
	MULTassign									{ $$ = new OperatorNode( OperatorNode::MulAssn ); }
	| DIVassign									{ $$ = new OperatorNode( OperatorNode::DivAssn ); }
	| MODassign									{ $$ = new OperatorNode( OperatorNode::ModAssn ); }
	| PLUSassign								{ $$ = new OperatorNode( OperatorNode::PlusAssn ); }
	| MINUSassign								{ $$ = new OperatorNode( OperatorNode::MinusAssn ); }
	| LSassign									{ $$ = new OperatorNode( OperatorNode::LSAssn ); }
	| RSassign									{ $$ = new OperatorNode( OperatorNode::RSAssn ); }
	| ANDassign									{ $$ = new OperatorNode( OperatorNode::AndAssn ); }
	| ERassign									{ $$ = new OperatorNode( OperatorNode::ERAssn ); }
	| ORassign									{ $$ = new OperatorNode( OperatorNode::OrAssn ); }
	;

comma_expression:
	assignment_expression
	| comma_expression ',' assignment_expression	// { $$ = (ExpressionNode *)$1->add_to_list( $3 ); }
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Comma ), $1, $3 ); }
	;

comma_expression_opt:
	// empty
		{ $$ = 0; }
	| comma_expression
	;

//*************************** STATEMENTS *******************************

statement:
	labeled_statement
	| compound_statement
	| expression_statement						{ $$ = $1; }
	| selection_statement
	| iteration_statement
	| jump_statement
	| exception_statement
	| asm_statement
	| ctor_dtor
	;

labeled_statement:
	no_attr_identifier ':' attribute_list_opt statement
		{
			$$ = $4->add_label( $1 );
		}
	;

compound_statement:
	'{' '}'
		{ $$ = new CompoundStmtNode( (StatementNode *)0 ); }
	| '{'
		// Two scopes are necessary because the block itself has a scope, but every declaration within the block also
		// requires its own scope
	  push push
	  local_label_declaration_opt						// GCC, local labels
	  block_item_list pop '}'							// C99, intermix declarations and statements
		{ $$ = new CompoundStmtNode( $5 ); }
	;

block_item_list:										// C99
	block_item
	| block_item_list push block_item
		{ if ( $1 != 0 ) { $1->set_link( $3 ); $$ = $1; } }
	;

block_item:
	declaration											// CFA, new & old style declarations
		{ $$ = new StatementNode( $1 ); }
	| EXTENSION declaration								// GCC
		{ $$ = new StatementNode( $2 ); }
	| function_definition
		{ $$ = new StatementNode( $1 ); }
	| statement pop
	;

statement_list:
	statement
	| statement_list statement
		{ if ( $1 != 0 ) { $1->set_link( $2 ); $$ = $1; } }
	;

expression_statement:
	comma_expression_opt ';'
		{ $$ = new StatementNode( StatementNode::Exp, $1, 0 ); }
	;

selection_statement:
	IF '(' comma_expression ')' statement				%prec THEN
		// explicitly deal with the shift/reduce conflict on if/else
		{ $$ = new StatementNode( StatementNode::If, $3, $5 ); }
	| IF '(' comma_expression ')' statement ELSE statement
		{ $$ = new StatementNode( StatementNode::If, $3, (StatementNode *)mkList((*$5, *$7 )) ); }
	| SWITCH '(' comma_expression ')' case_clause		// CFA
		{ $$ = new StatementNode( StatementNode::Switch, $3, $5 ); }
	| SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt '}' // CFA
		{ $$ = new StatementNode( StatementNode::Switch, $3, $8 ); /* xxx */ }
		// The semantics of the declaration list is changed to include any associated initialization, which is performed
		// *before* the transfer to the appropriate case clause.  Statements after the initial declaration list can
		// never be executed, and therefore, are removed from the grammar even though C allows it.
	| CHOOSE '(' comma_expression ')' case_clause		// CFA
		{ $$ = new StatementNode( StatementNode::Choose, $3, $5 ); }
	| CHOOSE '(' comma_expression ')' '{' push declaration_list_opt choose_clause_list_opt '}' // CFA
		{ $$ = new StatementNode( StatementNode::Choose, $3, $8 ); }
	;

// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
// clause allows a list of values and subranges.

case_value:												// CFA
	constant_expression							{ $$ = $1; }
	| constant_expression ELLIPSIS constant_expression	// GCC, subrange
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Range ), $1, $3 ); }
	| subrange											// CFA, subrange
	;

case_value_list:										// CFA
	case_value
	| case_value_list ',' case_value
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::TupleC ), (ExpressionNode *)(tupleContents( $1 ))->set_link( $3 ) ); }
	;

case_label:												// CFA
	CASE case_value_list ':'					{ $$ = new StatementNode( StatementNode::Case, $2, 0 ); }
	| DEFAULT ':'								{ $$ = new StatementNode( StatementNode::Default ); }
		// A semantic check is required to ensure only one default clause per switch/choose statement.
	;

case_label_list:										// CFA
	case_label
	| case_label_list case_label				{ $$ = (StatementNode *)( $1->set_link( $2 )); }
	;

case_clause:											// CFA
	case_label_list statement					{ $$ = $1->append_last_case( $2 ); }
	;

switch_clause_list_opt:									// CFA
	// empty
		{ $$ = 0; }
	| switch_clause_list
	;

switch_clause_list:										// CFA
	case_label_list statement_list
		{ $$ = $1->append_last_case( $2 ); }
	| switch_clause_list case_label_list statement_list
		{ $$ = (StatementNode *)( $1->set_link( $2->append_last_case( $3 ))); }
	;

choose_clause_list_opt:									// CFA
	// empty
		{ $$ = 0; }
	| choose_clause_list
	;

choose_clause_list:										// CFA
	case_label_list fall_through
		{ $$ = $1->append_last_case( $2 ); }
	| case_label_list statement_list fall_through_opt
		{ $$ = $1->append_last_case((StatementNode *)mkList((*$2,*$3 ))); }
	| choose_clause_list case_label_list fall_through
		{ $$ = (StatementNode *)( $1->set_link( $2->append_last_case( $3 ))); }
	| choose_clause_list case_label_list statement_list fall_through_opt
		{ $$ = (StatementNode *)( $1->set_link( $2->append_last_case((StatementNode *)mkList((*$3,*$4 ))))); }
	;

fall_through_opt:										// CFA
	// empty
		{ $$ = 0; }
	| fall_through
	;

fall_through:											// CFA
	FALLTHRU									{ $$ = new StatementNode( StatementNode::Fallthru ); }
	| FALLTHRU ';'								{ $$ = new StatementNode( StatementNode::Fallthru ); }
	;

iteration_statement:
	WHILE '(' comma_expression ')' statement
		{ $$ = new StatementNode( StatementNode::While, $3, $5 ); }
	| DO statement WHILE '(' comma_expression ')' ';'
		{ $$ = new StatementNode( StatementNode::Do, $5, $2 ); }
	| FOR '(' push for_control_expression ')' statement
		{ $$ = new StatementNode( StatementNode::For, $4, $6 ); }
	;

for_control_expression:
	comma_expression_opt pop ';' comma_expression_opt ';' comma_expression_opt
		{ $$ = new ForCtlExprNode( $1, $4, $6 ); }
	| declaration comma_expression_opt ';' comma_expression_opt // C99
		{ $$ = new ForCtlExprNode( $1, $2, $4 ); }
	;

jump_statement:
	GOTO no_attr_identifier ';'
		{ $$ = new StatementNode( StatementNode::Goto, $2 ); }
	| GOTO '*' comma_expression ';'						// GCC, computed goto
		// The syntax for the GCC computed goto violates normal expression precedence, e.g., goto *i+3; => goto *(i+3 );
		// whereas normal operator precedence yields goto (*i)+3;
		{ $$ = new StatementNode( StatementNode::Goto, $3 ); }
	| CONTINUE ';'
		// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
		{ $$ = new StatementNode( StatementNode::Continue ); }
	| CONTINUE no_attr_identifier ';'					// CFA, multi-level continue
		// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
		// the target of the transfer appears only at the start of an iteration statement.
		{ $$ = new StatementNode( StatementNode::Continue, $2 ); }
	| BREAK ';'
		// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
		{ $$ = new StatementNode( StatementNode::Break ); }
	| BREAK no_attr_identifier ';'						// CFA, multi-level exit
		// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
		// the target of the transfer appears only at the start of an iteration statement.
		{ $$ = new StatementNode( StatementNode::Break, $2 ); }
	| RETURN comma_expression_opt ';'
		{ $$ = new StatementNode( StatementNode::Return, $2, 0 ); }
	| THROW assignment_expression_opt ';'
		{ $$ = new StatementNode( StatementNode::Throw, $2, 0 ); }
//	| THROW ';'
//		{ $$ = new StatementNode( StatementNode::Throw ); }
	| THROWRESUME assignment_expression_opt ';'
		{ $$ = new StatementNode( StatementNode::Throw, $2, 0 ); }
	| THROWRESUME assignment_expression_opt AT assignment_expression ';'
		{ $$ = new StatementNode( StatementNode::Throw, $2, 0 ); }
//	| THROWRESUME ';'
//		{ $$ = new StatementNode( StatementNode::Throw ); }
	;

exception_statement:
	TRY compound_statement handler_list
		{ $$ = new StatementNode( StatementNode::Try, 0,(StatementNode *)(mkList((*$2,*$3 )))); }
	| TRY compound_statement finally_clause
		{ $$ = new StatementNode( StatementNode::Try, 0,(StatementNode *)(mkList((*$2,*$3 )))); }
	| TRY compound_statement handler_list finally_clause
		{
			$3->set_link( $4 );
			$$ = new StatementNode( StatementNode::Try, 0,(StatementNode *)(mkList((*$2,*$3 ))));
		}
	;

handler_list:
		// There must be at least one catch clause
	handler_clause
		// ISO/IEC 9899:1999 Section 15.3(6 ) If present, a "..." handler shall be the last handler for its try block.
	| CATCH '(' ELLIPSIS ')' compound_statement
		{ $$ = StatementNode::newCatchStmt( 0, $5, true ); }
	| handler_clause CATCH '(' ELLIPSIS ')' compound_statement
		{ $$ = $1->set_link( StatementNode::newCatchStmt( 0, $6, true ) ); }
	| CATCHRESUME '(' ELLIPSIS ')' compound_statement
		{ $$ = StatementNode::newCatchStmt( 0, $5, true ); }
	| handler_clause CATCHRESUME '(' ELLIPSIS ')' compound_statement
		{ $$ = $1->set_link( StatementNode::newCatchStmt( 0, $6, true ) ); }
	;

handler_clause:
	CATCH '(' push push exception_declaration pop ')' compound_statement pop
		{ $$ = StatementNode::newCatchStmt( $5, $8 ); }
	| handler_clause CATCH '(' push push exception_declaration pop ')' compound_statement pop
		{ $$ = $1->set_link( StatementNode::newCatchStmt( $6, $9 ) ); }
	| CATCHRESUME '(' push push exception_declaration pop ')' compound_statement pop
		{ $$ = StatementNode::newCatchStmt( $5, $8 ); }
	| handler_clause CATCHRESUME '(' push push exception_declaration pop ')' compound_statement pop
		{ $$ = $1->set_link( StatementNode::newCatchStmt( $6, $9 ) ); }
	;

finally_clause:
	FINALLY compound_statement
		{
			$$ = new StatementNode( StatementNode::Finally, 0, $2 );
			std::cout << "Just created a finally node" << std::endl;
		}
	;

exception_declaration:
		// A semantic check is required to ensure type_specifier does not create a new type, e.g.:
		//
		//		catch ( struct { int i; } x ) ...
		//
		// This new type cannot catch any thrown type because of name equivalence among types.
	type_specifier
	| type_specifier declarator
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $2->addType( $1 );
		}
	| type_specifier variable_abstract_declarator
		{ $$ = $2->addType( $1 ); }
	| new_abstract_declarator_tuple no_attr_identifier	// CFA
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $1->addName( $2 );
		}
	| new_abstract_declarator_tuple						// CFA
	;

asm_statement:
	ASM asm_volatile_opt '(' string_literal_list ')' ';'
		{ $$ = new AsmStmtNode( StatementNode::Asm, $2, $4, 0 ); }
	| ASM asm_volatile_opt '(' string_literal_list ':' asm_operands_opt ')' ';' // remaining GCC
		{ $$ = new AsmStmtNode( StatementNode::Asm, $2, $4, $6 ); }
	| ASM asm_volatile_opt '(' string_literal_list ':' asm_operands_opt ':' asm_operands_opt ')' ';'
		{ $$ = new AsmStmtNode( StatementNode::Asm, $2, $4, $6, $8 ); }
	| ASM asm_volatile_opt '(' string_literal_list ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
		{ $$ = new AsmStmtNode( StatementNode::Asm, $2, $4, $6, $8, $10 ); }
	| ASM asm_volatile_opt GOTO '(' string_literal_list ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
	{ $$ = new AsmStmtNode( StatementNode::Asm, $2, $5, 0, $8, $10, $12 ); }
	;

asm_volatile_opt:										// GCC
	// empty
		{ $$ = false; }
	| VOLATILE
		{ $$ = true; }
	;

asm_operands_opt:										// GCC
	// empty
		{ $$ = 0; }										// use default argument
	| asm_operands_list
	;

asm_operands_list:										// GCC
	asm_operand
	| asm_operands_list ',' asm_operand
		{ $$ = (ExpressionNode *)$1->set_link( $3 ); }
	;

asm_operand:											// GCC
	string_literal_list '(' constant_expression ')'
		{ $$ = new AsmExprNode( 0, $1, $3 ); }
	| '[' constant_expression ']' string_literal_list '(' constant_expression ')'
		{ $$ = new AsmExprNode( $2, $4, $6 ); }
	;

asm_clobbers_list_opt:										// GCC
	// empty
		{ $$ = 0; }										// use default argument
	| string_literal_list
		{ $$ = $1; }
	| asm_clobbers_list_opt ',' string_literal_list
		{ $$ = (ConstantNode *)$1->set_link( $3 ); }
	;

label_list:
	no_attr_identifier
		{ $$ = new LabelNode(); $$->append_label( $1 ); }
	| label_list ',' no_attr_identifier
		{ $$ = $1; $1->append_label( $3 ); }
	;

ctor_dtor:												// CFA, constructor/destructor
	no_attr_identifier_01 '{' argument_expression_list '}' ';'
		{
			Token fn; fn.str = new std::string( "?{}" ); fn.loc = $1.loc;
			$$ = new StatementNode( StatementNode::Exp, new CompositeExprNode( new VarRefNode( fn ),
				   (ExpressionNode *)((new CompositeExprNode( new OperatorNode( OperatorNode::AddressOf ), new VarRefNode( $1 ) ))->set_link( $3 )) ), 0 );
		}
	| '^' no_attr_identifier_01 '{' '}' ';'
		{
			Token fn; fn.str = new std::string( "^?{}" ); fn.loc = $2.loc;
			$$ = new StatementNode( StatementNode::Exp, new CompositeExprNode( new VarRefNode( fn ),
				   new CompositeExprNode( new OperatorNode( OperatorNode::AddressOf ), new VarRefNode( $2 ) ) ), 0 );
		}
	;

//******************************* DECLARATIONS *********************************

declaration_list_opt:									// used at beginning of switch statement
	pop
		{ $$ = 0; }
	| declaration_list
	;

declaration_list:
	declaration
	| declaration_list push declaration
		{ $$ = $1->appendList( $3 ); }
	;

old_declaration_list_opt:								// used to declare parameter types in K&R style functions
	pop
		{ $$ = 0; }
	| old_declaration_list
	;

old_declaration_list:
	old_declaration
	| old_declaration_list push old_declaration
		{ $$ = $1->appendList( $3 ); }
	;

local_label_declaration_opt:							// GCC, local label
	// empty
	| local_label_declaration_list
	;

local_label_declaration_list:							// GCC, local label
	LABEL local_label_list ';'
	| local_label_declaration_list LABEL local_label_list ';'
	;

local_label_list:										// GCC, local label
	no_attr_identifier_or_type_name				{}
	| local_label_list ',' no_attr_identifier_or_type_name {}
	;

declaration:											// CFA, new & old style declarations
	new_declaration
	| old_declaration
	;

// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
// the declaration list (as in Pascal).  ANSI C and the new CFA declarations may appear together in the same program
// block, but cannot be mixed within a specific declaration.
//
//			CFA					C
//		[10] int x;			int x[10];		// array of 10 integers
//		[10] * char y;		char *y[10];	// array of 10 pointers to char

new_declaration:										// CFA
	new_variable_declaration pop ';'
	| new_typedef_declaration pop ';'
	| new_function_declaration pop ';'
	| type_declaring_list pop ';'
	| context_specifier pop ';'
	;

new_variable_declaration:								// CFA
	new_variable_specifier initializer_opt
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $1;
		}
	| declaration_qualifier_list new_variable_specifier initializer_opt
		// declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
		// them as a type_qualifier cannot appear in that context.
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $2->addQualifiers( $1 );
		}
	| new_variable_declaration pop ',' push identifier_or_type_name initializer_opt
		{
			typedefTable.addToEnclosingScope( *$5, TypedefTable::ID );
			$$ = $1->appendList( $1->cloneType( $5 ) );
		}
	;

new_variable_specifier:									// CFA
		// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
		// storage-class
	new_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
		{
			typedefTable.setNextIdentifier( *$2 );
			$$ = $1->addName( $2 );
		}
	| new_abstract_tuple identifier_or_type_name asm_name_opt
		{
			typedefTable.setNextIdentifier( *$2 );
			$$ = $1->addName( $2 );
		}
	| type_qualifier_list new_abstract_tuple identifier_or_type_name asm_name_opt
		{
			typedefTable.setNextIdentifier( *$3 );
			$$ = $2->addQualifiers( $1 )->addName( $3 );
		}
	;

new_function_declaration:								// CFA
	new_function_specifier
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $1;
		}
	| type_qualifier_list new_function_specifier
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $2->addQualifiers( $1 );
		}
	| declaration_qualifier_list new_function_specifier
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $2->addQualifiers( $1 );
		}
	| declaration_qualifier_list type_qualifier_list new_function_specifier
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $3->addQualifiers( $1 )->addQualifiers( $2 );
		}
	| new_function_declaration pop ',' push identifier_or_type_name
		{
			typedefTable.addToEnclosingScope( *$5, TypedefTable::ID );
			$$ = $1->appendList( $1->cloneType( $5 ) );
		}
	;

new_function_specifier:									// CFA
	'[' ']' identifier_or_type_name '(' push new_parameter_type_list_opt pop ')' // S/R conflict
		{
			$$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( 0 ), $6, 0, true );
		}
//	'[' ']' identifier '(' push new_parameter_type_list_opt pop ')'
//		{
//			typedefTable.setNextIdentifier( *$5 );
//			$$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
//		}
//	| '[' ']' TYPEDEFname '(' push new_parameter_type_list_opt pop ')'
//		{
//			typedefTable.setNextIdentifier( *$5 );
//			$$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
//		}
//	| '[' ']' typegen_name
		// identifier_or_type_name must be broken apart because of the sequence:
		//
		//   '[' ']' identifier_or_type_name '(' new_parameter_type_list_opt ')'
		//   '[' ']' type_specifier
		//
		// type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
		// flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
	| new_abstract_tuple identifier_or_type_name '(' push new_parameter_type_list_opt pop ')'
		// To obtain LR(1 ), this rule must be factored out from function return type (see new_abstract_declarator).
		{
			$$ = DeclarationNode::newFunction( $2, $1, $5, 0, true );
		}
	| new_function_return identifier_or_type_name '(' push new_parameter_type_list_opt pop ')'
		{
			$$ = DeclarationNode::newFunction( $2, $1, $5, 0, true );
		}
	;

new_function_return:									// CFA
	'[' push new_parameter_list pop ']'
		{ $$ = DeclarationNode::newTuple( $3 ); }
	| '[' push new_parameter_list pop ',' push new_abstract_parameter_list pop ']'
		// To obtain LR(1 ), the last new_abstract_parameter_list is added into this flattened rule to lookahead to the
		// ']'.
		{ $$ = DeclarationNode::newTuple( $3->appendList( $7 ) ); }
	;

new_typedef_declaration:								// CFA
	TYPEDEF new_variable_specifier
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $2->addTypedef();
		}
	| TYPEDEF new_function_specifier
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $2->addTypedef();
		}
	| new_typedef_declaration pop ',' push no_attr_identifier
		{
			typedefTable.addToEnclosingScope( *$5, TypedefTable::TD );
			$$ = $1->appendList( $1->cloneType( $5 ) );
		}
	;

// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.

typedef_declaration:
	TYPEDEF type_specifier declarator
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $3->addType( $2 )->addTypedef();
		}
	| typedef_declaration pop ',' push declarator
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $1->appendList( $1->cloneBaseType( $5 )->addTypedef() );
		}
	| type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $4->addType( $3 )->addQualifiers( $1 )->addTypedef();
		}
	| type_specifier TYPEDEF declarator
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $3->addType( $1 )->addTypedef();
		}
	| type_specifier TYPEDEF type_qualifier_list declarator
		{
			typedefTable.addToEnclosingScope( TypedefTable::TD );
			$$ = $4->addQualifiers( $1 )->addTypedef()->addType( $1 );
		}
	;

typedef_expression:
		// GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
	TYPEDEF no_attr_identifier '=' assignment_expression
		{
			typedefTable.addToEnclosingScope( *$2, TypedefTable::TD );
			$$ = DeclarationNode::newName( 0 ); // XXX
		}
	| typedef_expression pop ',' push no_attr_identifier '=' assignment_expression
		{
			typedefTable.addToEnclosingScope( *$5, TypedefTable::TD );
			$$ = DeclarationNode::newName( 0 ); // XXX
		}
	;

old_declaration:
	declaring_list pop ';'
	| typedef_declaration pop ';'
	| typedef_expression pop ';'						// GCC, naming expression type
	| sue_declaration_specifier pop ';'
	;

declaring_list:
		// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
		// storage-class
	declaration_specifier declarator asm_name_opt initializer_opt
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = ( $2->addType( $1 ))->addInitializer( $4 );
		}
	| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $1->appendList( $1->cloneBaseType( $4->addInitializer( $6 ) ) );
		}
	;

declaration_specifier:									// type specifier + storage class
	basic_declaration_specifier
	| sue_declaration_specifier
	| typedef_declaration_specifier
	| typegen_declaration_specifier
	;

type_specifier:											// declaration specifier - storage class
	basic_type_specifier
	| sue_type_specifier
	| typedef_type_specifier
	| typegen_type_specifier
	;

type_qualifier_list_opt:								// GCC, used in asm_statement
	// empty
		{ $$ = 0; }
	| type_qualifier_list
	;

type_qualifier_list:
		// A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
		//
		// ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
		// specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
		// appeared only once.
	type_qualifier
	| type_qualifier_list type_qualifier
		{ $$ = $1->addQualifiers( $2 ); }
	;

type_qualifier:
	type_qualifier_name
	| attribute
	//{ $$ = DeclarationNode::newQualifier( DeclarationNode::Attribute ); }
	;

type_qualifier_name:
	CONST
		{ $$ = DeclarationNode::newQualifier( DeclarationNode::Const ); }
	| RESTRICT
		{ $$ = DeclarationNode::newQualifier( DeclarationNode::Restrict ); }
	| VOLATILE
		{ $$ = DeclarationNode::newQualifier( DeclarationNode::Volatile ); }
	| LVALUE											// CFA
		{ $$ = DeclarationNode::newQualifier( DeclarationNode::Lvalue ); }
	| ATOMIC
		{ $$ = DeclarationNode::newQualifier( DeclarationNode::Atomic ); }
	| FORALL '('
		{
			typedefTable.enterScope();
		}
	  type_parameter_list ')'							// CFA
		{
			typedefTable.leaveScope();
			$$ = DeclarationNode::newForall( $4 );
		}
	;

declaration_qualifier_list:
	storage_class_list
	| type_qualifier_list storage_class_list			// remaining OBSOLESCENT (see 2 )
		{ $$ = $1->addQualifiers( $2 ); }
	| declaration_qualifier_list type_qualifier_list storage_class_list
		{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
	;

storage_class_list:
		// A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
		// only one of each is specified, except for inline, which can appear with the others.
		//
		// ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
		// specifiers in a declaration.
	storage_class
	| storage_class_list storage_class
		{ $$ = $1->addQualifiers( $2 ); }
	;

storage_class:
	storage_class_name
	;

storage_class_name:
	EXTERN
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Extern ); }
	| STATIC
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Static ); }
	| AUTO
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Auto ); }
	| REGISTER
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Register ); }
	| INLINE											// C99
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Inline ); }
	| FORTRAN											// C99
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Fortran ); }
	| NORETURN											// C11
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Noreturn ); }
	| THREADLOCAL										// C11
		{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Threadlocal ); }
	;

basic_type_name:
	CHAR
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Char ); }
	| DOUBLE
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Double ); }
	| FLOAT
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float ); }
	| INT
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int ); }
	| LONG
		{ $$ = DeclarationNode::newModifier( DeclarationNode::Long ); }
	| SHORT
		{ $$ = DeclarationNode::newModifier( DeclarationNode::Short ); }
	| SIGNED
		{ $$ = DeclarationNode::newModifier( DeclarationNode::Signed ); }
	| UNSIGNED
		{ $$ = DeclarationNode::newModifier( DeclarationNode::Unsigned ); }
	| VOID
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
	| BOOL												// C99
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Bool ); }
	| COMPLEX											// C99
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Complex ); }
	| IMAGINARY											// C99
		{ $$ = DeclarationNode::newBasicType( DeclarationNode::Imaginary ); }
	;

basic_declaration_specifier:
		// A semantic check is necessary for conflicting storage classes.
	basic_type_specifier
	| declaration_qualifier_list basic_type_specifier
		{ $$ = $2->addQualifiers( $1 ); }
	| basic_declaration_specifier storage_class			// remaining OBSOLESCENT (see 2)
		{ $$ = $1->addQualifiers( $2 ); }
	| basic_declaration_specifier storage_class type_qualifier_list
		{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
	| basic_declaration_specifier storage_class basic_type_specifier
		{ $$ = $3->addQualifiers( $2 )->addType( $1 ); }
	;

basic_type_specifier:
	direct_type_name
	| type_qualifier_list_opt indirect_type_name type_qualifier_list_opt
		{ $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
	;

direct_type_name:
		// A semantic check is necessary for conflicting type qualifiers.
	basic_type_name
	| type_qualifier_list basic_type_name
		{ $$ = $2->addQualifiers( $1 ); }
	| direct_type_name type_qualifier
		{ $$ = $1->addQualifiers( $2 ); }
	| direct_type_name basic_type_name
		{ $$ = $1->addType( $2 ); }
	;

indirect_type_name:
	TYPEOF '(' type_name ')'							// GCC: typeof(x) y;
		{ $$ = $3; }
	| TYPEOF '(' comma_expression ')'					// GCC: typeof(a+b) y;
		{ $$ = DeclarationNode::newTypeof( $3 ); }
	| ATTR_TYPEGENname '(' type_name ')'				// CFA: e.g., @type(x) y;
		{ $$ = DeclarationNode::newAttr( $1, $3 ); }
	| ATTR_TYPEGENname '(' comma_expression ')'			// CFA: e.g., @type(a+b) y;
		{ $$ = DeclarationNode::newAttr( $1, $3 ); }
	;

sue_declaration_specifier:
	sue_type_specifier
	| declaration_qualifier_list sue_type_specifier
		{ $$ = $2->addQualifiers( $1 ); }
	| sue_declaration_specifier storage_class			// remaining OBSOLESCENT (see 2)
		{ $$ = $1->addQualifiers( $2 ); }
	| sue_declaration_specifier storage_class type_qualifier_list
		{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
	;

sue_type_specifier:
	elaborated_type_name								// struct, union, enum
	| type_qualifier_list elaborated_type_name
		{ $$ = $2->addQualifiers( $1 ); }
	| sue_type_specifier type_qualifier
		{ $$ = $1->addQualifiers( $2 ); }
	;

typedef_declaration_specifier:
	typedef_type_specifier
	| declaration_qualifier_list typedef_type_specifier
		{ $$ = $2->addQualifiers( $1 ); }
	| typedef_declaration_specifier storage_class		// remaining OBSOLESCENT (see 2)
		{ $$ = $1->addQualifiers( $2 ); }
	| typedef_declaration_specifier storage_class type_qualifier_list
		{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
	;

typedef_type_specifier:									// typedef types
	TYPEDEFname
		{ $$ = DeclarationNode::newFromTypedef( $1 ); }
	| type_qualifier_list TYPEDEFname
		{ $$ = DeclarationNode::newFromTypedef( $2 )->addQualifiers( $1 ); }
	| typedef_type_specifier type_qualifier
		{ $$ = $1->addQualifiers( $2 ); }
	;

elaborated_type_name:
	aggregate_name
	| enum_name
	;

aggregate_name:
	aggregate_key '{' field_declaration_list '}'
		{ $$ = DeclarationNode::newAggregate( $1, 0, 0, $3 ); }
	| aggregate_key no_attr_identifier_or_type_name
	 	{ $$ = DeclarationNode::newAggregate( $1, $2, 0, 0 ); }
	| aggregate_key no_attr_identifier_or_type_name '{' field_declaration_list '}'
	 	{ $$ = DeclarationNode::newAggregate( $1, $2, 0, $4 ); }
	| aggregate_key '(' type_name_list ')' '{' field_declaration_list '}' // CFA
	 	{ $$ = DeclarationNode::newAggregate( $1, 0, $3, $6 ); }
	| aggregate_key typegen_name						// CFA, S/R conflict
		{ $$ = $2; }
	;

aggregate_key:
	STRUCT attribute_list_opt
		{ $$ = DeclarationNode::Struct; }
	| UNION attribute_list_opt
		{ $$ = DeclarationNode::Union; }
	;

field_declaration_list:
	field_declaration
		{ $$ = $1; }
	| field_declaration_list field_declaration
		{ $$ = $1->appendList( $2 ); }
	;

field_declaration:
	new_field_declaring_list ';'						// CFA, new style field declaration
	| EXTENSION new_field_declaring_list ';'			// GCC
		{ $$ = $2; }
	| field_declaring_list ';'
	| EXTENSION field_declaring_list ';'				// GCC
		{ $$ = $2; }
	;

new_field_declaring_list:								// CFA, new style field declaration
	new_abstract_declarator_tuple						// CFA, no field name
	| new_abstract_declarator_tuple no_attr_identifier_or_type_name
		{ $$ = $1->addName( $2 ); }
	| new_field_declaring_list ',' no_attr_identifier_or_type_name
		{ $$ = $1->appendList( $1->cloneType( $3 ) ); }
	| new_field_declaring_list ','						// CFA, no field name
		{ $$ = $1->appendList( $1->cloneType( 0 ) ); }
	;

field_declaring_list:
	type_specifier field_declarator
		{ $$ = $2->addType( $1 ); }
	| field_declaring_list ',' attribute_list_opt field_declarator
		{ $$ = $1->appendList( $1->cloneBaseType( $4 ) ); }
	;

field_declarator:
	// empty
		{ $$ = DeclarationNode::newName( 0 ); /* XXX */ } // CFA, no field name
	| bit_subrange_size									// no field name
		{ $$ = DeclarationNode::newBitfield( $1 ); }
	| variable_declarator bit_subrange_size_opt
		// A semantic check is required to ensure bit_subrange only appears on base type int.
		{ $$ = $1->addBitfield( $2 ); }
	| type_redeclarator bit_subrange_size_opt
		// A semantic check is required to ensure bit_subrange only appears on base type int.
		{ $$ = $1->addBitfield( $2 ); }
	| variable_abstract_declarator						// CFA, no field name
	;

bit_subrange_size_opt:
	// empty
		{ $$ = 0; }
	| bit_subrange_size
		{ $$ = $1; }
	;

bit_subrange_size:
	':' constant_expression
		{ $$ = $2; }
	;

enum_key:
	ENUM attribute_list_opt
	;

enum_name:
	enum_key '{' enumerator_list comma_opt '}'
		{ $$ = DeclarationNode::newEnum( 0, $3 ); }
	| enum_key no_attr_identifier_or_type_name '{' enumerator_list comma_opt '}'
		{ $$ = DeclarationNode::newEnum( $2, $4 ); }
	| enum_key no_attr_identifier_or_type_name
		{ $$ = DeclarationNode::newEnum( $2, 0 ); }
	;

enumerator_list:
	no_attr_identifier_or_type_name enumerator_value_opt
		{ $$ = DeclarationNode::newEnumConstant( $1, $2 ); }
	| enumerator_list ',' no_attr_identifier_or_type_name enumerator_value_opt
		{ $$ = $1->appendList( DeclarationNode::newEnumConstant( $3, $4 ) ); }
	;

enumerator_value_opt:
	// empty
		{ $$ = 0; }
	| '=' constant_expression
		{ $$ = $2; }
	;

// Minimum of one parameter after which ellipsis is allowed only at the end.

new_parameter_type_list_opt:							// CFA
	// empty
		{ $$ = 0; }
	| new_parameter_type_list
	;

new_parameter_type_list:								// CFA, abstract + real
	new_abstract_parameter_list
	| new_parameter_list
	| new_parameter_list pop ',' push new_abstract_parameter_list
		{ $$ = $1->appendList( $5 ); }
	| new_abstract_parameter_list pop ',' push ELLIPSIS
		{ $$ = $1->addVarArgs(); }
	| new_parameter_list pop ',' push ELLIPSIS
		{ $$ = $1->addVarArgs(); }
	;

new_parameter_list:										// CFA
		// To obtain LR(1) between new_parameter_list and new_abstract_tuple, the last new_abstract_parameter_list is
		// factored out from new_parameter_list, flattening the rules to get lookahead to the ']'.
	new_parameter_declaration
	| new_abstract_parameter_list pop ',' push new_parameter_declaration
		{ $$ = $1->appendList( $5 ); }
	| new_parameter_list pop ',' push new_parameter_declaration
		{ $$ = $1->appendList( $5 ); }
	| new_parameter_list pop ',' push new_abstract_parameter_list pop ',' push new_parameter_declaration
		{ $$ = $1->appendList( $5 )->appendList( $9 ); }
	;

new_abstract_parameter_list:							// CFA, new & old style abstract
	new_abstract_parameter_declaration
	| new_abstract_parameter_list pop ',' push new_abstract_parameter_declaration
		{ $$ = $1->appendList( $5 ); }
	;

parameter_type_list_opt:
	// empty
		{ $$ = 0; }
	| parameter_type_list
	;

parameter_type_list:
	parameter_list
	| parameter_list pop ',' push ELLIPSIS
		{ $$ = $1->addVarArgs(); }
	;

parameter_list:											// abstract + real
	abstract_parameter_declaration
	| parameter_declaration
	| parameter_list pop ',' push abstract_parameter_declaration
		{ $$ = $1->appendList( $5 ); }
	| parameter_list pop ',' push parameter_declaration
		{ $$ = $1->appendList( $5 ); }
	;

// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.

new_parameter_declaration:								// CFA, new & old style parameter declaration
	parameter_declaration
	| new_identifier_parameter_declarator_no_tuple identifier_or_type_name assignment_opt
		{ $$ = $1->addName( $2 ); }
	| new_abstract_tuple identifier_or_type_name assignment_opt
		// To obtain LR(1), these rules must be duplicated here (see new_abstract_declarator).
		{ $$ = $1->addName( $2 ); }
	| type_qualifier_list new_abstract_tuple identifier_or_type_name assignment_opt
		{ $$ = $2->addName( $3 )->addQualifiers( $1 ); }
	| new_function_specifier
	;

new_abstract_parameter_declaration:						// CFA, new & old style parameter declaration
	abstract_parameter_declaration
	| new_identifier_parameter_declarator_no_tuple
	| new_abstract_tuple
		// To obtain LR(1), these rules must be duplicated here (see new_abstract_declarator).
	| type_qualifier_list new_abstract_tuple
		{ $$ = $2->addQualifiers( $1 ); }
	| new_abstract_function
	;

parameter_declaration:
	declaration_specifier identifier_parameter_declarator assignment_opt
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $2->addType( $1 )->addInitializer( new InitializerNode( $3 ) );
		}
	| declaration_specifier type_parameter_redeclarator assignment_opt
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			$$ = $2->addType( $1 )->addInitializer( new InitializerNode( $3 ) );
		}
	;

abstract_parameter_declaration:
	declaration_specifier
	| declaration_specifier abstract_parameter_declarator
		{ $$ = $2->addType( $1 ); }
	;

// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
// identifiers.  The ANSI-style parameter-list can redefine a typedef name.

identifier_list:										// K&R-style parameter list => no types
	no_attr_identifier
		{ $$ = DeclarationNode::newName( $1 ); }
	| identifier_list ',' no_attr_identifier
		{ $$ = $1->appendList( DeclarationNode::newName( $3 ) ); }
	;

identifier_or_type_name:
	identifier
	| TYPEDEFname
	| TYPEGENname
	;

no_01_identifier_or_type_name:
	no_01_identifier
	| TYPEDEFname
	| TYPEGENname
	;

no_attr_identifier_or_type_name:
	no_attr_identifier
	| TYPEDEFname
	| TYPEGENname
	;

type_name_no_function:									// sizeof, alignof, cast (constructor)
	new_abstract_declarator_tuple						// CFA
	| type_specifier
	| type_specifier variable_abstract_declarator
		{ $$ = $2->addType( $1 ); }
	;

type_name:												// typeof, assertion
	new_abstract_declarator_tuple						// CFA
	| new_abstract_function								// CFA
	| type_specifier
	| type_specifier abstract_declarator
		{ $$ = $2->addType( $1 ); }
	;

initializer_opt:
	// empty
		{ $$ = 0; }
	| '=' initializer
		{ $$ = $2; }
	;

initializer:
	assignment_expression						{ $$ = new InitializerNode( $1 ); }
	| '{' initializer_list comma_opt '}'		{ $$ = new InitializerNode( $2, true ); }
	;

initializer_list:
	initializer
	| designation initializer					{ $$ = $2->set_designators( $1 ); }
	| initializer_list ',' initializer			{ $$ = (InitializerNode *)( $1->set_link( $3 ) ); }
	| initializer_list ',' designation initializer
		{ $$ = (InitializerNode *)( $1->set_link( $4->set_designators( $3 ) ) ); }
	;

// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
// '=' to separator the designator from the initializer value, as in:
//
//		int x[10] = { [1] = 3 };
//
// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment.  To disambiguate this case, CFA
// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
// shift/reduce conflicts

designation:
	designator_list ':'									// C99, CFA uses ":" instead of "="
	| no_attr_identifier_or_type_name ':'				// GCC, field name
		{ $$ = new VarRefNode( $1 ); }
	;

designator_list:										// C99
	designator
	| designator_list designator
		{ $$ = (ExpressionNode *)( $1->set_link( $2 )); }
	//| designator_list designator						{ $$ = new CompositeExprNode( $1, $2 ); }
	;

designator:
	// lexer ambiguity: designator ".0" is floating-point constant or designator for name 0
	// only ".0" and ".1" allowed => semantic check
	FLOATINGconstant
		{ $$ = new DesignatorNode( new VarRefNode( $1 ) ); }
	| '.' no_attr_identifier_or_type_name				// C99, field name
		{ $$ = new DesignatorNode( new VarRefNode( $2 ) ); }
	| '[' push assignment_expression pop ']'			// C99, single array element
		// assignment_expression used instead of constant_expression because of shift/reduce conflicts with tuple.
		{ $$ = new DesignatorNode( $3, true ); }
	| '[' push subrange pop ']'							// CFA, multiple array elements
		{ $$ = new DesignatorNode( $3, true ); }
	| '[' push constant_expression ELLIPSIS constant_expression pop ']' // GCC, multiple array elements
		{ $$ = new DesignatorNode( new CompositeExprNode( new OperatorNode( OperatorNode::Range ), $3, $5 ), true ); }
	| '.' '[' push field_list pop ']'					// CFA, tuple field selector
		{ $$ = new DesignatorNode( $4 ); }
	;

// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
// rather than an object-oriented type system. This required four groups of extensions:
//
// Overloading: function, data, and operator identifiers may be overloaded.
//
// Type declarations: "type" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
//     and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
//     definitions of new types. Type declarations with storage class "extern" provide opaque types.
//
// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
//     site. A polymorphic function is not a template; it is a function, with an address and a type.
//
// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
//     types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
//     hierarchies. Unlike classes, they can define relationships between types.  Assertions declare that a type or
//     types provide the operations declared by a specification.  Assertions are normally used to declare requirements
//     on type arguments of polymorphic functions.

typegen_declaration_specifier:							// CFA
	typegen_type_specifier
	| declaration_qualifier_list typegen_type_specifier
		{ $$ = $2->addQualifiers( $1 ); }
	| typegen_declaration_specifier storage_class		// remaining OBSOLESCENT (see 2)
		{ $$ = $1->addQualifiers( $2 ); }
	| typegen_declaration_specifier storage_class type_qualifier_list
		{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
	;

typegen_type_specifier:									// CFA
	typegen_name
	| type_qualifier_list typegen_name
		{ $$ = $2->addQualifiers( $1 ); }
	| typegen_type_specifier type_qualifier
		{ $$ = $1->addQualifiers( $2 ); }
	;

typegen_name:											// CFA
	TYPEGENname '(' type_name_list ')'
		{ $$ = DeclarationNode::newFromTypeGen( $1, $3 ); }
	;

type_parameter_list:									// CFA
	type_parameter assignment_opt
	| type_parameter_list ',' type_parameter assignment_opt
		{ $$ = $1->appendList( $3 ); }
	;

type_parameter:											// CFA
	type_class no_attr_identifier_or_type_name
		{ typedefTable.addToEnclosingScope( *$2, TypedefTable::TD ); }
	  assertion_list_opt
		{ $$ = DeclarationNode::newTypeParam( $1, $2 )->addAssertions( $4 ); }
	| type_specifier identifier_parameter_declarator
	;

type_class:												// CFA
	TYPE
		{ $$ = DeclarationNode::Type; }
	| DTYPE
		{ $$ = DeclarationNode::Ftype; }
	| FTYPE
		{ $$ = DeclarationNode::Dtype; }
	;

assertion_list_opt:										// CFA
	// empty
		{ $$ = 0; }
	| assertion_list_opt assertion
		{ $$ = $1 == 0 ? $2 : $1->appendList( $2 ); }
	;

assertion:												// CFA
	'|' no_attr_identifier_or_type_name '(' type_name_list ')'
		{
			typedefTable.openContext( *$2 );
			$$ = DeclarationNode::newContextUse( $2, $4 );
		}
	| '|' '{' push context_declaration_list '}'
		{ $$ = $4; }
	| '|' '(' push type_parameter_list pop ')' '{' push context_declaration_list '}' '(' type_name_list ')'
		{ $$ = 0; }
	;

type_name_list:											// CFA
	type_name
		{ $$ = new TypeValueNode( $1 ); }
	| assignment_expression
	| type_name_list ',' type_name
		{ $$ = (ExpressionNode *)( $1->set_link( new TypeValueNode( $3 ))); }
	| type_name_list ',' assignment_expression
		{ $$ = (ExpressionNode *)( $1->set_link( $3 )); }
	;

type_declaring_list:									// CFA
	TYPE type_declarator
		{ $$ = $2; }
	| storage_class_list TYPE type_declarator
		{ $$ = $3->addQualifiers( $1 ); }
	| type_declaring_list ',' type_declarator
		{ $$ = $1->appendList( $3->copyStorageClasses( $1 ) ); }
	;

type_declarator:										// CFA
	type_declarator_name assertion_list_opt
		{ $$ = $1->addAssertions( $2 ); }
	| type_declarator_name assertion_list_opt '=' type_name
		{ $$ = $1->addAssertions( $2 )->addType( $4 ); }
	;

type_declarator_name:									// CFA
	no_attr_identifier_or_type_name
		{
			typedefTable.addToEnclosingScope( *$1, TypedefTable::TD );
			$$ = DeclarationNode::newTypeDecl( $1, 0 );
		}
	| no_01_identifier_or_type_name '(' push type_parameter_list pop ')'
		{
			typedefTable.addToEnclosingScope( *$1, TypedefTable::TG );
			$$ = DeclarationNode::newTypeDecl( $1, $4 );
		}
	;

context_specifier:										// CFA
	CONTEXT no_attr_identifier_or_type_name '(' push type_parameter_list pop ')' '{' '}'
		{
			typedefTable.addToEnclosingScope( *$2, TypedefTable::ID );
			$$ = DeclarationNode::newContext( $2, $5, 0 );
		}
	| CONTEXT no_attr_identifier_or_type_name '(' push type_parameter_list pop ')' '{'
		{
			typedefTable.enterContext( *$2 );
			typedefTable.enterScope();
		}
	  context_declaration_list '}'
		{
			typedefTable.leaveContext();
			typedefTable.addToEnclosingScope( *$2, TypedefTable::ID );
			$$ = DeclarationNode::newContext( $2, $5, $10 );
		}
	;

context_declaration_list:								// CFA
	context_declaration
	| context_declaration_list push context_declaration
		{ $$ = $1->appendList( $3 ); }
	;

context_declaration:									// CFA
	new_context_declaring_list pop ';'
	| context_declaring_list pop ';'
	;

new_context_declaring_list:								// CFA
	new_variable_specifier
		{
			typedefTable.addToEnclosingScope2( TypedefTable::ID );
			$$ = $1;
		}
	| new_function_specifier
		{
			typedefTable.addToEnclosingScope2( TypedefTable::ID );
			$$ = $1;
		}
	| new_context_declaring_list pop ',' push identifier_or_type_name
		{
			typedefTable.addToEnclosingScope2( *$5, TypedefTable::ID );
			$$ = $1->appendList( $1->cloneType( $5 ) );
		}
	;

context_declaring_list:									// CFA
	type_specifier declarator
		{
			typedefTable.addToEnclosingScope2( TypedefTable::ID );
			$$ = $2->addType( $1 );
		}
	| context_declaring_list pop ',' push declarator
		{
			typedefTable.addToEnclosingScope2( TypedefTable::ID );
			$$ = $1->appendList( $1->cloneBaseType( $5 ) );
		}
	;

//***************************** EXTERNAL DEFINITIONS *****************************

translation_unit:
	// empty
		{}												// empty input file
	| external_definition_list
		{
			if ( theTree ) {
				theTree->appendList( $1 );
			} else {
				theTree = $1;
			}
		}
	;

external_definition_list:
	external_definition
	| external_definition_list push external_definition
		{ $$ = ( $1 != NULL ) ? $1->appendList( $3 ) : $3; }
	;

external_definition_list_opt:
	// empty
		{ $$ = 0; }
	| external_definition_list
	;

external_definition:
	declaration
	| external_function_definition
	| asm_statement										// GCC, global assembler statement
		{}
	| EXTERN STRINGliteral
		{
			linkageStack.push( linkage );
			linkage = LinkageSpec::fromString( *$2 );
		}
	  '{' external_definition_list_opt '}'				// C++-style linkage specifier
		{
			linkage = linkageStack.top();
			linkageStack.pop();
			$$ = $5;
		}
	| EXTENSION external_definition
		{ $$ = $2; }
	;

external_function_definition:
	function_definition
		// These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
		// code with functions missing a type-specifier on the return type.  Parsing is possible because
		// function_definition does not appear in the context of an expression (nested functions would preclude this
		// concession). A function prototype declaration must still have a type_specifier.  OBSOLESCENT (see 1)
	| function_declarator compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $1->addFunctionBody( $2 );
		}
	| old_function_declarator push old_declaration_list_opt compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $1->addOldDeclList( $3 )->addFunctionBody( $4 );
		}
	;

function_definition:
	new_function_declaration compound_statement			// CFA
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $1->addFunctionBody( $2 );
		}
	| declaration_specifier function_declarator compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $2->addFunctionBody( $3 )->addType( $1 );
		}
	| type_qualifier_list function_declarator compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $2->addFunctionBody( $3 )->addQualifiers( $1 );
		}
	| declaration_qualifier_list function_declarator compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $2->addFunctionBody( $3 )->addQualifiers( $1 );
		}
	| declaration_qualifier_list type_qualifier_list function_declarator compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $3->addFunctionBody( $4 )->addQualifiers( $2 )->addQualifiers( $1 );
		}

		// Old-style K&R function definition, OBSOLESCENT (see 4)
	| declaration_specifier old_function_declarator push old_declaration_list_opt compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $2->addOldDeclList( $4 )->addFunctionBody( $5 )->addType( $1 );
		}
	| type_qualifier_list old_function_declarator push old_declaration_list_opt compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $2->addOldDeclList( $4 )->addFunctionBody( $5 )->addQualifiers( $1 );
		}

		// Old-style K&R function definition with "implicit int" type_specifier, OBSOLESCENT (see 4)
	| declaration_qualifier_list old_function_declarator push old_declaration_list_opt compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $2->addOldDeclList( $4 )->addFunctionBody( $5 )->addQualifiers( $1 );
		}
	| declaration_qualifier_list type_qualifier_list old_function_declarator push old_declaration_list_opt compound_statement
		{
			typedefTable.addToEnclosingScope( TypedefTable::ID );
			typedefTable.leaveScope();
			$$ = $3->addOldDeclList( $5 )->addFunctionBody( $6 )->addQualifiers( $2 )->addQualifiers( $1 );
		}
	;

declarator:
	variable_declarator
	| function_declarator
	| type_redeclarator
	;

subrange:
	constant_expression '~' constant_expression			// CFA, integer subrange
		{ $$ = new CompositeExprNode( new OperatorNode( OperatorNode::Range ), $1, $3 ); }
	;

asm_name_opt:											// GCC
	// empty
	| ASM '(' string_literal_list ')' attribute_list_opt
	;

attribute_list_opt:										// GCC
	// empty
		{ $$ = 0; }
	| attribute_list
	;

attribute_list:											// GCC
	attribute
	| attribute_list attribute
		{ $$ = $2->addQualifiers( $1 ); }
	;

attribute:												// GCC
	ATTRIBUTE '(' '(' attribute_parameter_list ')' ')'
	//		{ $$ = DeclarationNode::newQualifier( DeclarationNode::Attribute ); }
		{ $$ = 0; }
	;

attribute_parameter_list:								// GCC
	attrib
	| attribute_parameter_list ',' attrib
	;

attrib:													// GCC
	// empty
	| any_word
	| any_word '(' comma_expression_opt ')'
	;

any_word:												// GCC
	identifier_or_type_name {}
	| storage_class_name {}
	| basic_type_name {}
	| type_qualifier {}
	;

// ============================================================================
// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
// in:
//
//		int (*f())[10] { ... };
//		... (*f())[3] += 1;		// definition mimics usage
//
// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
// ============================================================================

// ----------------------------------------------------------------------------
// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
// to define a variable or function prototype, e.g.:
//
//		valid declaration		invalid definition
//		-----------------		------------------
//		int f;					int f {}
//		int *f;					int *f {}
//		int f[10];				int f[10] {}
//		int (*f)(int);			int (*f)(int) {}
//
// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
// variable_declarator and function_declarator.
// ----------------------------------------------------------------------------

// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
// declaring an array of functions versus a pointer to an array of functions.

variable_declarator:
	paren_identifier attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| variable_ptr
	| variable_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| variable_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

paren_identifier:
	identifier
		{
			typedefTable.setNextIdentifier( *$1 );
			$$ = DeclarationNode::newName( $1 );
		}
	| '(' paren_identifier ')'							// redundant parenthesis
		{ $$ = $2; }
	;

variable_ptr:
	'*' variable_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list variable_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' variable_ptr ')'
		{ $$ = $2; }
	;

variable_array:
	paren_identifier array_dimension
		{ $$ = $1->addArray( $2 ); }
	| '(' variable_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' variable_array ')' multi_array_dimension		// redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' variable_array ')'							// redundant parenthesis
		{ $$ = $2; }
	;

variable_function:
	'(' variable_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	| '(' variable_function ')'							// redundant parenthesis
		{ $$ = $2; }
	;

// This pattern parses a function declarator that is not redefining a typedef name. Because functions cannot be nested,
// there is no context where a function definition can redefine a typedef name. To allow nested functions requires
// further separation of variable and function declarators in type_redeclarator.  The pattern precludes returning
// arrays and functions versus pointers to arrays and functions.

function_declarator:
	function_no_ptr attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| function_ptr
	| function_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

function_no_ptr:
	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $1->addParamList( $4 ); }
	| '(' function_ptr ')' '(' push parameter_type_list_opt pop ')'
		{ $$ = $2->addParamList( $6 ); }
	| '(' function_no_ptr ')'							// redundant parenthesis
		{ $$ = $2; }
	;

function_ptr:
	'*' function_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list function_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' function_ptr ')'
		{ $$ = $2; }
	;

function_array:
	'(' function_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' function_array ')' multi_array_dimension		// redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' function_array ')'							// redundant parenthesis
		{ $$ = $2; }
	;

// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4) that is not redefining a typedef name
// (see function_declarator for additional comments). The pattern precludes returning arrays and functions versus
// pointers to arrays and functions.

old_function_declarator:
	old_function_no_ptr
	| old_function_ptr
	| old_function_array
	;

old_function_no_ptr:
	paren_identifier '(' identifier_list ')'			// function_declarator handles empty parameter
		{ $$ = $1->addIdList( $3 ); }
	| '(' old_function_ptr ')' '(' identifier_list ')'
		{ $$ = $2->addIdList( $5 ); }
	| '(' old_function_no_ptr ')'						// redundant parenthesis
		{ $$ = $2; }
	;

old_function_ptr:
	'*' old_function_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list old_function_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' old_function_ptr ')'
		{ $$ = $2; }
	;

old_function_array:
	'(' old_function_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' old_function_array ')' multi_array_dimension	// redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' old_function_array ')'						// redundant parenthesis
		{ $$ = $2; }
	;

// This pattern parses a declaration for a variable or function prototype that redefines a type name, e.g.:
//
//		typedef int foo;
//		{
//		   int foo; // redefine typedef name in new scope
//		}
//
// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
// and functions versus pointers to arrays and functions.

type_redeclarator:
	paren_type attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| type_ptr
	| type_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| type_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

paren_type:
	typedef
	| '(' paren_type ')'
		{ $$ = $2; }
	;

type_ptr:
	'*' type_redeclarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list type_redeclarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' type_ptr ')'
		{ $$ = $2; }
	;

type_array:
	paren_type array_dimension
		{ $$ = $1->addArray( $2 ); }
	| '(' type_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' type_array ')' multi_array_dimension			// redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' type_array ')'								// redundant parenthesis
		{ $$ = $2; }
	;

type_function:
	paren_type '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $1->addParamList( $4 ); }
	| '(' type_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	| '(' type_function ')'								// redundant parenthesis
		{ $$ = $2; }
	;

// This pattern parses a declaration for a parameter variable or function prototype that is not redefining a typedef
// name and allows the C99 array options, which can only appear in a parameter list.  The pattern precludes declaring an
// array of functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to
// arrays and functions.

identifier_parameter_declarator:
	paren_identifier attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| identifier_parameter_ptr
	| identifier_parameter_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| identifier_parameter_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

identifier_parameter_ptr:
	'*' identifier_parameter_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list identifier_parameter_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' identifier_parameter_ptr ')'
		{ $$ = $2; }
	;

identifier_parameter_array:
	paren_identifier array_parameter_dimension
		{ $$ = $1->addArray( $2 ); }
	| '(' identifier_parameter_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' identifier_parameter_array ')'				// redundant parenthesis
		{ $$ = $2; }
	;

identifier_parameter_function:
	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $1->addParamList( $4 ); }
	| '(' identifier_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	| '(' identifier_parameter_function ')'				// redundant parenthesis
		{ $$ = $2; }
	;

// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
// e.g.:
//
//		typedef int foo;
//		int f( int foo ); // redefine typedef name in new scope
//
// and allows the C99 array options, which can only appear in a parameter list.  In addition, the pattern handles the
// special meaning of parenthesis around a typedef name:
//
//		ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
//		parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
//		not as redundant parentheses around the identifier."
//
// which precludes the following cases:
//
//		typedef float T;
//		int f( int ( T [5] ) );					// see abstract_parameter_declarator
//		int g( int ( T ( int ) ) );				// see abstract_parameter_declarator
//		int f( int f1( T a[5] ) );				// see identifier_parameter_declarator
//		int g( int g1( T g2( int p ) ) );		// see identifier_parameter_declarator
//
// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
// functions.

type_parameter_redeclarator:
	typedef attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| type_parameter_ptr
	| type_parameter_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| type_parameter_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

typedef:
	TYPEDEFname
		{
			typedefTable.setNextIdentifier( *$1 );
			$$ = DeclarationNode::newName( $1 );
		}
	| TYPEGENname
		{
			typedefTable.setNextIdentifier( *$1 );
			$$ = DeclarationNode::newName( $1 );
		}
	;

type_parameter_ptr:
	'*' type_parameter_redeclarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list type_parameter_redeclarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' type_parameter_ptr ')'
		{ $$ = $2; }
	;

type_parameter_array:
	typedef array_parameter_dimension
		{ $$ = $1->addArray( $2 ); }
	| '(' type_parameter_ptr ')' array_parameter_dimension
		{ $$ = $2->addArray( $4 ); }
	;

type_parameter_function:
	typedef '(' push parameter_type_list_opt pop ')'	// empty parameter list OBSOLESCENT (see 3)
		{ $$ = $1->addParamList( $4 ); }
	| '(' type_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	;

// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
// which the type applies, e.g.:
//
//		sizeof( int );
//		sizeof( int [10] );
//
// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
// and functions versus pointers to arrays and functions.

abstract_declarator:
	abstract_ptr
	| abstract_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| abstract_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

abstract_ptr:
	'*'
		{ $$ = DeclarationNode::newPointer( 0 ); }
	| '*' type_qualifier_list
		{ $$ = DeclarationNode::newPointer( $2 ); }
	| '*' abstract_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list abstract_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' abstract_ptr ')'
		{ $$ = $2; }
	;

abstract_array:
	array_dimension
	| '(' abstract_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' abstract_array ')' multi_array_dimension		// redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' abstract_array ')'							// redundant parenthesis
		{ $$ = $2; }
	;

abstract_function:
	'(' push parameter_type_list_opt pop ')'			// empty parameter list OBSOLESCENT (see 3)
		{ $$ = DeclarationNode::newFunction( 0, 0, $3, 0 ); }
	| '(' abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	| '(' abstract_function ')'							// redundant parenthesis
		{ $$ = $2; }
	;

array_dimension:
		// Only the first dimension can be empty.
	'[' ']'
		{ $$ = DeclarationNode::newArray( 0, 0, false ); }
	| '[' ']' multi_array_dimension
		{ $$ = DeclarationNode::newArray( 0, 0, false )->addArray( $3 ); }
	| multi_array_dimension
	;

multi_array_dimension:
	'[' push assignment_expression pop ']'
		{ $$ = DeclarationNode::newArray( $3, 0, false ); }
	| '[' push '*' pop ']'								// C99
		{ $$ = DeclarationNode::newVarArray( 0 ); }
	| multi_array_dimension '[' push assignment_expression pop ']'
		{ $$ = $1->addArray( DeclarationNode::newArray( $4, 0, false ) ); }
	| multi_array_dimension '[' push '*' pop ']'		// C99
		{ $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
	;

// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
// identifier to which the type applies, e.g.:
//
//		int f( int );			// abstract variable parameter; no parameter name specified
//		int f( int (int) );		// abstract function-prototype parameter; no parameter name specified
//
// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
// and functions versus pointers to arrays and functions.

abstract_parameter_declarator:
	abstract_parameter_ptr
	| abstract_parameter_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| abstract_parameter_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

abstract_parameter_ptr:
	'*'
		{ $$ = DeclarationNode::newPointer( 0 ); }
	| '*' type_qualifier_list
		{ $$ = DeclarationNode::newPointer( $2 ); }
	| '*' abstract_parameter_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list abstract_parameter_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' abstract_parameter_ptr ')'
		{ $$ = $2; }
	;

abstract_parameter_array:
	array_parameter_dimension
	| '(' abstract_parameter_ptr ')' array_parameter_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' abstract_parameter_array ')'					// redundant parenthesis
		{ $$ = $2; }
	;

abstract_parameter_function:
	'(' push parameter_type_list_opt pop ')'			// empty parameter list OBSOLESCENT (see 3)
		{ $$ = DeclarationNode::newFunction( 0, 0, $3, 0 ); }
	| '(' abstract_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	| '(' abstract_parameter_function ')'				// redundant parenthesis
		{ $$ = $2; }
	;

array_parameter_dimension:
		// Only the first dimension can be empty or have qualifiers.
	array_parameter_1st_dimension
	| array_parameter_1st_dimension multi_array_dimension
		{ $$ = $1->addArray( $2 ); }
	| multi_array_dimension
	;

// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
//
//		ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
//		a declaration of a function parameter with an array type, and then only in the outermost array type derivation."

array_parameter_1st_dimension:
	'[' ']'
		{ $$ = DeclarationNode::newArray( 0, 0, false ); }
	// multi_array_dimension handles the '[' '*' ']' case
	| '[' push type_qualifier_list '*' pop ']'			// remaining C99
		{ $$ = DeclarationNode::newVarArray( $3 ); }
	| '[' push type_qualifier_list pop ']'
		{ $$ = DeclarationNode::newArray( 0, $3, false ); }
	// multi_array_dimension handles the '[' assignment_expression ']' case
	| '[' push type_qualifier_list assignment_expression pop ']'
		{ $$ = DeclarationNode::newArray( $4, $3, false ); }
	| '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
		{ $$ = DeclarationNode::newArray( $5, $4, true ); }
	| '[' push type_qualifier_list STATIC assignment_expression pop ']'
		{ $$ = DeclarationNode::newArray( $5, $3, true ); }
	;

// This pattern parses a declaration of an abstract variable, i.e., there is no identifier to which the type applies,
// e.g.:
//
//		sizeof( int ); // abstract variable; no identifier name specified
//
// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
// and functions versus pointers to arrays and functions.

variable_abstract_declarator:
	variable_abstract_ptr
	| variable_abstract_array attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	| variable_abstract_function attribute_list_opt
		{ $$ = $1->addQualifiers( $2 ); }
	;

variable_abstract_ptr:
	'*'
		{ $$ = DeclarationNode::newPointer( 0 ); }
	| '*' type_qualifier_list
		{ $$ = DeclarationNode::newPointer( $2 ); }
	| '*' variable_abstract_declarator
		{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
	| '*' type_qualifier_list variable_abstract_declarator
		{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
	| '(' variable_abstract_ptr ')'
		{ $$ = $2; }
	;

variable_abstract_array:
	array_dimension
	| '(' variable_abstract_ptr ')' array_dimension
		{ $$ = $2->addArray( $4 ); }
	| '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
		{ $$ = $2->addArray( $4 ); }
	| '(' variable_abstract_array ')'					// redundant parenthesis
		{ $$ = $2; }
	;

variable_abstract_function:
	'(' variable_abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
		{ $$ = $2->addParamList( $6 ); }
	| '(' variable_abstract_function ')'				// redundant parenthesis
		{ $$ = $2; }
	;

// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.

new_identifier_parameter_declarator_tuple:				// CFA
	new_identifier_parameter_declarator_no_tuple
	| new_abstract_tuple
	| type_qualifier_list new_abstract_tuple
		{ $$ = $2->addQualifiers( $1 ); }
	;

new_identifier_parameter_declarator_no_tuple:			// CFA
	new_identifier_parameter_ptr
	| new_identifier_parameter_array
	;

new_identifier_parameter_ptr:							// CFA
	'*' type_specifier
		{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
	| type_qualifier_list '*' type_specifier
		{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
	| '*' new_abstract_function
		{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
	| type_qualifier_list '*' new_abstract_function
		{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
	| '*' new_identifier_parameter_declarator_tuple
		{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
	| type_qualifier_list '*' new_identifier_parameter_declarator_tuple
		{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
	;

new_identifier_parameter_array:							// CFA
		// Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
		// shift/reduce conflict with new-style empty (void) function return type.
	'[' ']' type_specifier
		{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| new_array_parameter_1st_dimension type_specifier
		{ $$ = $2->addNewArray( $1 ); }
	| '[' ']' multi_array_dimension type_specifier
		{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| new_array_parameter_1st_dimension multi_array_dimension type_specifier
		{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
	| multi_array_dimension type_specifier
		{ $$ = $2->addNewArray( $1 ); }
	| '[' ']' new_identifier_parameter_ptr
		{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| new_array_parameter_1st_dimension new_identifier_parameter_ptr
		{ $$ = $2->addNewArray( $1 ); }
	| '[' ']' multi_array_dimension new_identifier_parameter_ptr
		{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| new_array_parameter_1st_dimension multi_array_dimension new_identifier_parameter_ptr
		{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
	| multi_array_dimension new_identifier_parameter_ptr
		{ $$ = $2->addNewArray( $1 ); }
	;

new_array_parameter_1st_dimension:
	'[' push type_qualifier_list '*' pop ']'			// remaining C99
		{ $$ = DeclarationNode::newVarArray( $3 ); }
	| '[' push type_qualifier_list assignment_expression pop ']'
		{ $$ = DeclarationNode::newArray( $4, $3, false ); }
	| '[' push declaration_qualifier_list assignment_expression pop ']'
		// declaration_qualifier_list must be used because of shift/reduce conflict with
		// assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
		// appear in this context.
		{ $$ = DeclarationNode::newArray( $4, $3, true ); }
	| '[' push declaration_qualifier_list type_qualifier_list assignment_expression pop ']'
		{ $$ = DeclarationNode::newArray( $5, $4->addQualifiers( $3 ), true ); }
	;

// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
// identifier to which the type applies, e.g.:
//
//		[int] f( int );				// abstract variable parameter; no parameter name specified
//		[int] f( [int] (int) );		// abstract function-prototype parameter; no parameter name specified
//
// These rules need LR(3):
//
//		new_abstract_tuple identifier_or_type_name
//		'[' new_parameter_list ']' identifier_or_type_name '(' new_parameter_type_list_opt ')'
//
// since a function return type can be syntactically identical to a tuple type:
//
//		[int, int] t;
//		[int, int] f( int );
//
// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
// new_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
// lookahead. To accomplish this, new_abstract_declarator has an entry point without tuple, and tuple declarations are
// duplicated when appearing with new_function_specifier.

new_abstract_declarator_tuple:							// CFA
	new_abstract_tuple
	| type_qualifier_list new_abstract_tuple
		{ $$ = $2->addQualifiers( $1 ); }
	| new_abstract_declarator_no_tuple
	;

new_abstract_declarator_no_tuple:						// CFA
	new_abstract_ptr
	| new_abstract_array
	;

new_abstract_ptr:										// CFA
	'*' type_specifier
		{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
	| type_qualifier_list '*' type_specifier
		{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
	| '*' new_abstract_function
		{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
	| type_qualifier_list '*' new_abstract_function
		{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
	| '*' new_abstract_declarator_tuple
		{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
	| type_qualifier_list '*' new_abstract_declarator_tuple
		{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
	;

new_abstract_array:										// CFA
		// Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
		// empty (void) function return type.
	'[' ']' type_specifier
		{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| '[' ']' multi_array_dimension type_specifier
		{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| multi_array_dimension type_specifier
		{ $$ = $2->addNewArray( $1 ); }
	| '[' ']' new_abstract_ptr
		{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| '[' ']' multi_array_dimension new_abstract_ptr
		{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
	| multi_array_dimension new_abstract_ptr
		{ $$ = $2->addNewArray( $1 ); }
	;

new_abstract_tuple:										// CFA
	'[' push new_abstract_parameter_list pop ']'
		{ $$ = DeclarationNode::newTuple( $3 ); }
	;

new_abstract_function:									// CFA
	'[' ']' '(' new_parameter_type_list_opt ')'
		{ $$ = DeclarationNode::newFunction( 0, DeclarationNode::newTuple( 0 ), $4, 0 ); }
	| new_abstract_tuple '(' push new_parameter_type_list_opt pop ')'
		{ $$ = DeclarationNode::newFunction( 0, $1, $4, 0 ); }
	| new_function_return '(' push new_parameter_type_list_opt pop ')'
		{ $$ = DeclarationNode::newFunction( 0, $1, $4, 0 ); }
	;

// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
//    each declaration, and in the specifier-qualifier list in each structure declaration and type name."
//
// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
//    the declaration specifiers in a declaration is an obsolescent feature."
//
// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
//    prototype-format parameter type declarators) is an obsolescent feature."
//
// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
//    declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.

//************************* MISCELLANEOUS ********************************

comma_opt:												// redundant comma
	// empty
	| ','
	;

assignment_opt:
	// empty
		{ $$ = 0; }
	| '=' assignment_expression
		{ $$ = $2; }
	;

%%
// ----end of grammar----

void yyerror( const char * ) {
	std::cout << "Error ";
	if ( yyfilename ) {
	    std::cout << "in file " << yyfilename << " ";
	} // if
	std::cout << "at line " << yylineno << " reading token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << "\"" << std::endl;
}

// Local Variables: //
// mode: c++ //
// tab-width: 4 //
// compile-command: "make install" //
// End: //