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parser.yy @ 3f80888

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Last change on this file since 3f80888 was dd020c0, checked in by Peter A. Buhr <pabuhr@…>, 7 years ago
first attempt to create function specifiers
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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// cfa.y --
8	//
9	// Author : Peter A. Buhr
10	// Created On : Sat Sep 1 20:22:55 2001
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Fri Mar 3 21:35:28 2017
13	// Update Count : 2222
14	//
15
16	// This grammar is based on the ANSI99/11 C grammar, specifically parts of EXPRESSION and STATEMENTS, and on the C
17	// grammar by James A. Roskind, specifically parts of DECLARATIONS and EXTERNAL DEFINITIONS. While parts have been
18	// copied, important changes have been made in all sections; these changes are sufficient to constitute a new grammar.
19	// In particular, this grammar attempts to be more syntactically precise, i.e., it parses less incorrect language syntax
20	// that must be subsequently rejected by semantic checks. Nevertheless, there are still several semantic checks
21	// required and many are noted in the grammar. Finally, the grammar is extended with GCC and CFA language extensions.
22
23	// Acknowledgments to Richard Bilson, Glen Ditchfield, and Rodolfo Gabriel Esteves who all helped when I got stuck with
24	// the grammar.
25
26	// The root language for this grammar is ANSI99/11 C. All of ANSI99/11 is parsed, except for:
27	//
28	// 1. designation with '=' (use ':' instead)
29	//
30	// Most of the syntactic extensions from ANSI90 to ANSI11 C are marked with the comment "C99/C11". This grammar also has
31	// two levels of extensions. The first extensions cover most of the GCC C extensions, except for:
32	//
33	// 1. designation with and without '=' (use ':' instead)
34	// 2. attributes not allowed in parenthesis of declarator
35	//
36	// All of the syntactic extensions for GCC C are marked with the comment "GCC". The second extensions are for Cforall
37	// (CFA), which fixes several of C's outstanding problems and extends C with many modern language concepts. All of the
38	// syntactic extensions for CFA C are marked with the comment "CFA". As noted above, there is one unreconcileable
39	// parsing problem between C99 and CFA with respect to designators; this is discussed in detail before the "designation"
40	// grammar rule.
41
42	%{
43	#define YYDEBUG_LEXER_TEXT (yylval) // lexer loads this up each time
44	#define YYDEBUG 1 // get the pretty debugging code to compile
45
46	#undef __GNUC_MINOR__
47
48	#include <cstdio>
49	#include <stack>
50	#include "lex.h"
51	#include "parser.h"
52	#include "ParseNode.h"
53	#include "TypedefTable.h"
54	#include "TypeData.h"
55	#include "LinkageSpec.h"
56	using namespace std;
57
58	extern DeclarationNode * parseTree;
59	extern LinkageSpec::Spec linkage;
60	extern TypedefTable typedefTable;
61
62	stack< LinkageSpec::Spec > linkageStack;
63
64	void appendStr( string to, string from ) {
65	// "abc" "def" "ghi" => "abcdefghi", remove new text from quotes and insert before last quote in old string.
66	to->insert( to->length() - 1, from->substr( 1, from->length() - 2 ) );
67	} // appendStr
68
69	DeclarationNode * distAttr( DeclarationNode * specifier, DeclarationNode * declList ) {
70	// distribute declaration_specifier across all declared variables, e.g., static, const, __attribute__.
71	DeclarationNode * cur = declList, * cl = (new DeclarationNode)->addType( specifier );
72	//cur->addType( specifier );
73	for ( cur = dynamic_cast< DeclarationNode * >( cur->get_next() ); cur != nullptr; cur = dynamic_cast< DeclarationNode * >( cur->get_next() ) ) {
74	cl->cloneBaseType( cur );
75	} // for
76	declList->addType( cl );
77	// delete cl;
78	return declList;
79	} // distAttr
80
81	void distExt( DeclarationNode * declaration ) {
82	// distribute EXTENSION across all declarations
83	for ( DeclarationNode iter = declaration; iter != nullptr; iter = (DeclarationNode )iter->get_next() ) {
84	iter->set_extension( true );
85	} // for
86	} // distExt
87	%}
88
89	//*********************** TERMINAL TOKENS ******************************
90
91	// keywords
92	%token TYPEDEF
93	%token AUTO EXTERN REGISTER STATIC
94	%token INLINE // C99
95	%token FORTRAN // C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
96	%token CONST VOLATILE
97	%token RESTRICT // C99
98	%token FORALL LVALUE // CFA
99	%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED ZERO_T ONE_T
100	%token VALIST // GCC
101	%token BOOL COMPLEX IMAGINARY // C99
102	%token TYPEOF LABEL // GCC
103	%token ENUM STRUCT UNION
104	%token OTYPE FTYPE DTYPE TTYPE TRAIT // CFA
105	%token SIZEOF OFFSETOF
106	%token ATTRIBUTE EXTENSION // GCC
107	%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
108	%token CHOOSE DISABLE ENABLE FALLTHRU TRY CATCH CATCHRESUME FINALLY THROW THROWRESUME AT // CFA
109	%token ASM // C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
110	%token ALIGNAS ALIGNOF ATOMIC GENERIC NORETURN STATICASSERT THREADLOCAL // C11
111
112	// names and constants: lexer differentiates between identifier and typedef names
113	%token<tok> IDENTIFIER QUOTED_IDENTIFIER TYPEDEFname TYPEGENname
114	%token<tok> ATTR_IDENTIFIER ATTR_TYPEDEFname ATTR_TYPEGENname
115	%token<tok> INTEGERconstant CHARACTERconstant STRINGliteral
116	// Floating point constant is broken into three kinds of tokens because of the ambiguity with tuple indexing and
117	// overloading constants 0/1, e.g., x.1 is lexed as (x)(.1), where (.1) is a factional constant, but is semantically
118	// converted into the tuple index (.)(1). e.g., 3.x
119	%token<tok> REALDECIMALconstant REALFRACTIONconstant FLOATINGconstant
120	%token<tok> ZERO ONE // CFA
121
122	// multi-character operators
123	%token ARROW // ->
124	%token ICR DECR // ++ --
125	%token LS RS // << >>
126	%token LE GE EQ NE // <= >= == !=
127	%token ANDAND OROR // && \|\|
128	%token ELLIPSIS // ...
129
130	%token MULTassign DIVassign MODassign // *= /= %=/
131	%token PLUSassign MINUSassign // += -=
132	%token LSassign RSassign // <<= >>=
133	%token ANDassign ERassign ORassign // &= ^= \|=
134
135	%token ATassign // @=
136
137	// Types declaration
138	%union
139	{
140	Token tok;
141	ParseNode * pn;
142	ExpressionNode * en;
143	DeclarationNode * decl;
144	DeclarationNode::Aggregate aggKey;
145	DeclarationNode::TypeClass tclass;
146	StatementNode * sn;
147	ConstantExpr * constant;
148	ForCtl * fctl;
149	LabelNode * label;
150	InitializerNode * in;
151	OperKinds op;
152	std::string * str;
153	bool flag;
154	}
155
156	%type<tok> identifier no_01_identifier no_attr_identifier zero_one
157	%type<tok> identifier_or_type_name no_attr_identifier_or_type_name no_01_identifier_or_type_name attr_name
158	%type<constant> string_literal
159	%type<str> string_literal_list
160
161	// expressions
162	%type<en> constant
163	%type<en> tuple tuple_expression_list
164	%type<op> ptrref_operator unary_operator assignment_operator
165	%type<en> primary_expression postfix_expression unary_expression
166	%type<en> cast_expression multiplicative_expression additive_expression shift_expression
167	%type<en> relational_expression equality_expression AND_expression exclusive_OR_expression
168	%type<en> inclusive_OR_expression logical_AND_expression logical_OR_expression conditional_expression
169	%type<en> constant_expression assignment_expression assignment_expression_opt
170	%type<en> comma_expression comma_expression_opt
171	%type<en> argument_expression_list argument_expression assignment_opt
172	%type<fctl> for_control_expression
173	%type<en> subrange
174	%type<decl> asm_name_opt
175	%type<en> asm_operands_opt asm_operands_list asm_operand
176	%type<label> label_list
177	%type<en> asm_clobbers_list_opt
178	%type<flag> asm_volatile_opt
179
180	// statements
181	%type<sn> labeled_statement compound_statement expression_statement selection_statement
182	%type<sn> iteration_statement jump_statement exception_statement asm_statement
183	%type<sn> fall_through_opt fall_through
184	%type<sn> statement statement_list
185	%type<sn> block_item_list block_item
186	%type<sn> case_clause
187	%type<en> case_value
188	%type<sn> case_value_list case_label case_label_list
189	%type<sn> switch_clause_list_opt switch_clause_list choose_clause_list_opt choose_clause_list
190	%type<sn> handler_list handler_clause finally_clause
191
192	// declarations
193	%type<decl> abstract_declarator abstract_ptr abstract_array abstract_function array_dimension multi_array_dimension
194	%type<decl> abstract_parameter_declarator abstract_parameter_ptr abstract_parameter_array abstract_parameter_function array_parameter_dimension array_parameter_1st_dimension
195	%type<decl> abstract_parameter_declaration
196
197	%type<aggKey> aggregate_key
198	%type<decl> aggregate_type aggregate_type_nobody
199
200	%type<decl> assertion assertion_list_opt
201
202	%type<en> bit_subrange_size_opt bit_subrange_size
203
204	%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type_name indirect_type_name
205
206	%type<decl> trait_declaration trait_declaration_list trait_declaring_list trait_specifier
207
208	%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
209	%type<decl> declaration_specifier declaration_specifier_nobody declarator declaring_list
210
211	%type<decl> elaborated_type elaborated_type_nobody
212
213	%type<decl> enumerator_list enum_type enum_type_nobody
214	%type<en> enumerator_value_opt
215
216	%type<decl> exception_declaration external_definition external_definition_list external_definition_list_opt
217
218	%type<decl> field_declaration field_declaration_list field_declarator field_declaring_list
219	%type<en> field field_list field_name fraction_constants
220
221	%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr
222
223	%type<decl> identifier_parameter_array identifier_parameter_declarator identifier_parameter_function
224	%type<decl> identifier_parameter_ptr identifier_list
225
226	%type<decl> cfa_abstract_array cfa_abstract_declarator_no_tuple cfa_abstract_declarator_tuple
227	%type<decl> cfa_abstract_function cfa_abstract_parameter_declaration cfa_abstract_parameter_list
228	%type<decl> cfa_abstract_ptr cfa_abstract_tuple
229
230	%type<decl> cfa_array_parameter_1st_dimension
231
232	%type<decl> cfa_trait_declaring_list cfa_declaration cfa_field_declaring_list
233	%type<decl> cfa_function_declaration cfa_function_return cfa_function_specifier
234
235	%type<decl> cfa_identifier_parameter_array cfa_identifier_parameter_declarator_no_tuple
236	%type<decl> cfa_identifier_parameter_declarator_tuple cfa_identifier_parameter_ptr
237
238	%type<decl> cfa_parameter_declaration cfa_parameter_list cfa_parameter_type_list cfa_parameter_type_list_opt
239
240	%type<decl> cfa_typedef_declaration cfa_variable_declaration cfa_variable_specifier
241
242	%type<decl> c_declaration
243	%type<decl> KR_function_declarator KR_function_no_ptr KR_function_ptr KR_function_array
244	%type<decl> KR_declaration_list KR_declaration_list_opt
245
246	%type<decl> parameter_declaration parameter_list parameter_type_list
247	%type<decl> parameter_type_list_opt
248
249	%type<decl> paren_identifier paren_type
250
251	%type<decl> storage_class storage_class_list
252
253	%type<decl> sue_declaration_specifier sue_declaration_specifier_nobody sue_type_specifier sue_type_specifier_nobody
254
255	%type<tclass> type_class
256	%type<decl> type_declarator type_declarator_name type_declaring_list
257
258	%type<decl> typedef typedef_type_specifier typedef_declaration typedef_declaration_specifier typedef_expression
259
260	%type<decl> variable_type_redeclarator type_ptr type_array type_function
261
262	%type<decl> type_parameter_redeclarator type_parameter_ptr type_parameter_array type_parameter_function
263	%type<decl> typegen_declaration_specifier typegen_type_specifier typegen_name
264
265	%type<decl> type_name type_name_no_function
266	%type<decl> type_parameter type_parameter_list
267
268	%type<en> type_name_list
269
270	%type<decl> type_qualifier type_qualifier_name type_qualifier_list type_qualifier_list_opt type_specifier type_specifier_nobody
271
272	%type<decl> variable_declarator variable_ptr variable_array variable_function
273	%type<decl> variable_abstract_declarator variable_abstract_ptr variable_abstract_array variable_abstract_function
274
275	%type<decl> attribute_list_opt attribute_list attribute_name_list attribute attribute_name
276
277	// initializers
278	%type<in> initializer initializer_list initializer_opt
279
280	// designators
281	%type<en> designator designator_list designation
282
283
284	// Handle single shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string
285	// is ambiguous:
286	// .---------. matches IF '(' comma_expression ')' statement
287	// if ( C ) S1 else S2
288	// `-----------------' matches IF '(' comma_expression ')' statement ELSE statement */
289
290	%nonassoc THEN // rule precedence for IF '(' comma_expression ')' statement
291	%nonassoc ELSE // token precedence for start of else clause in IF statement
292
293	%start translation_unit // parse-tree root
294
295	%%
296	//*********************** Namespace Management ******************************
297
298	// The grammar in the ANSI C standard is not strictly context-free, since it relies upon the distinct terminal symbols
299	// "identifier" and "TYPEDEFname" that are lexically identical. While it is possible to write a purely context-free
300	// grammar, such a grammar would obscure the relationship between syntactic and semantic constructs. Hence, this
301	// grammar uses the ANSI style.
302	//
303	// Cforall compounds this problem by introducing type names local to the scope of a declaration (for instance, those
304	// introduced through "forall" qualifiers), and by introducing "type generators" -- parameterized types. This latter
305	// type name creates a third class of identifiers that must be distinguished by the scanner.
306	//
307	// Since the scanner cannot distinguish among the different classes of identifiers without some context information, it
308	// accesses a data structure (TypedefTable) to allow classification of an identifier that it has just read. Semantic
309	// actions during the parser update this data structure when the class of identifiers change.
310	//
311	// Because the Cforall language is block-scoped, there is the possibility that an identifier can change its class in a
312	// local scope; it must revert to its original class at the end of the block. Since type names can be local to a
313	// particular declaration, each declaration is itself a scope. This requires distinguishing between type names that are
314	// local to the current declaration scope and those that persist past the end of the declaration (i.e., names defined in
315	// "typedef" or "otype" declarations).
316	//
317	// The non-terminals "push" and "pop" derive the empty string; their only use is to denote the opening and closing of
318	// scopes. Every push must have a matching pop, although it is regrettable the matching pairs do not always occur
319	// within the same rule. These non-terminals may appear in more contexts than strictly necessary from a semantic point
320	// of view. Unfortunately, these extra rules are necessary to prevent parsing conflicts -- the parser may not have
321	// enough context and look-ahead information to decide whether a new scope is necessary, so the effect of these extra
322	// rules is to open a new scope unconditionally. As the grammar evolves, it may be neccesary to add or move around
323	// "push" and "pop" nonterminals to resolve conflicts of this sort.
324
325	push:
326	{ typedefTable.enterScope(); }
327	;
328
329	pop:
330	{ typedefTable.leaveScope(); }
331	;
332
333	//*********************** CONSTANTS ******************************
334
335	constant:
336	// ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
337	INTEGERconstant { $$ = new ExpressionNode( build_constantInteger( *$1 ) ); }
338	\| REALDECIMALconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
339	\| REALFRACTIONconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
340	\| FLOATINGconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
341	\| CHARACTERconstant { $$ = new ExpressionNode( build_constantChar( *$1 ) ); }
342	;
343
344	identifier:
345	IDENTIFIER
346	\| ATTR_IDENTIFIER // CFA
347	\| zero_one // CFA
348	;
349
350	no_01_identifier:
351	IDENTIFIER
352	\| ATTR_IDENTIFIER // CFA
353	;
354
355	no_attr_identifier:
356	IDENTIFIER
357	\| zero_one // CFA
358	;
359
360	zero_one: // CFA
361	ZERO
362	\| ONE
363	;
364
365	string_literal:
366	string_literal_list { $$ = build_constantStr( *$1 ); }
367	;
368
369	string_literal_list: // juxtaposed strings are concatenated
370	STRINGliteral { $$ = $1; } // conversion from tok to str
371	\| string_literal_list STRINGliteral
372	{
373	appendStr( $1, $2 ); // append 2nd juxtaposed string to 1st
374	delete $2; // allocated by lexer
375	$$ = $1; // conversion from tok to str
376	}
377	;
378
379	//*********************** EXPRESSIONS ******************************
380
381	primary_expression:
382	IDENTIFIER // typedef name cannot be used as a variable name
383	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
384	\| zero_one
385	{ $$ = new ExpressionNode( build_constantZeroOne( *$1 ) ); }
386	\| tuple
387	\| '(' comma_expression ')'
388	{ $$ = $2; }
389	\| '(' compound_statement ')' // GCC, lambda expression
390	{ $$ = new ExpressionNode( build_valexpr( $2 ) ); }
391	;
392
393	postfix_expression:
394	primary_expression
395	\| postfix_expression '[' push assignment_expression pop ']'
396	// CFA, comma_expression disallowed in this context because it results in a common user error: subscripting a
397	// matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
398	// little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
399	// equivalent to the old x[i,j].
400	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Index, $1, $4 ) ); }
401	\| postfix_expression '(' argument_expression_list ')'
402	{ $$ = new ExpressionNode( build_func( $1, $3 ) ); }
403	\| postfix_expression '.' no_attr_identifier
404	{ $$ = new ExpressionNode( build_fieldSel( $1, build_varref( $3 ) ) ); }
405	\| postfix_expression '.' '[' push field_list pop ']' // CFA, tuple field selector
406	{ $$ = new ExpressionNode( build_fieldSel( $1, build_tuple( $5 ) ) ); }
407	\| postfix_expression REALFRACTIONconstant // CFA, tuple index
408	{ $$ = new ExpressionNode( build_fieldSel( $1, build_field_name_REALFRACTIONconstant( *$2 ) ) ); }
409	\| postfix_expression ARROW no_attr_identifier
410	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_varref( $3 ) ) ); }
411	\| postfix_expression ARROW '[' push field_list pop ']' // CFA, tuple field selector
412	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_tuple( $5 ) ) ); }
413	\| postfix_expression ICR
414	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::IncrPost, $1 ) ); }
415	\| postfix_expression DECR
416	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::DecrPost, $1 ) ); }
417	\| '(' type_name_no_function ')' '{' initializer_list comma_opt '}' // C99
418	{ $$ = new ExpressionNode( build_compoundLiteral( $2, new InitializerNode( $5, true ) ) ); }
419	\| postfix_expression '{' argument_expression_list '}' // CFA
420	{
421	Token fn;
422	fn.str = new std::string( "?{}" ); // location undefined - use location of '{'?
423	$$ = new ExpressionNode( new ConstructorExpr( build_func( new ExpressionNode( build_varref( fn ) ), (ExpressionNode *)( $1 )->set_last( $3 ) ) ) );
424	}
425	;
426
427	argument_expression_list:
428	argument_expression
429	\| argument_expression_list ',' argument_expression
430	{ $$ = (ExpressionNode *)( $1->set_last( $3 )); }
431	;
432
433	argument_expression:
434	// empty
435	{ $$ = nullptr; } // use default argument
436	\| assignment_expression
437	;
438
439	field_list: // CFA, tuple field selector
440	field
441	\| field_list ',' field { $$ = (ExpressionNode *)$1->set_last( $3 ); }
442	;
443
444	field: // CFA, tuple field selector
445	field_name
446	\| REALDECIMALconstant field
447	{ $$ = new ExpressionNode( build_fieldSel( new ExpressionNode( build_field_name_REALDECIMALconstant( *$1 ) ), maybeMoveBuild<Expression>( $2 ) ) ); }
448	\| REALDECIMALconstant '[' push field_list pop ']'
449	{ $$ = new ExpressionNode( build_fieldSel( new ExpressionNode( build_field_name_REALDECIMALconstant( *$1 ) ), build_tuple( $4 ) ) ); }
450	\| field_name '.' field
451	{ $$ = new ExpressionNode( build_fieldSel( $1, maybeMoveBuild<Expression>( $3 ) ) ); }
452	\| field_name '.' '[' push field_list pop ']'
453	{ $$ = new ExpressionNode( build_fieldSel( $1, build_tuple( $5 ) ) ); }
454	\| field_name ARROW field
455	{ $$ = new ExpressionNode( build_pfieldSel( $1, maybeMoveBuild<Expression>( $3 ) ) ); }
456	\| field_name ARROW '[' push field_list pop ']'
457	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_tuple( $5 ) ) ); }
458	;
459
460	field_name:
461	INTEGERconstant fraction_constants
462	{ $$ = new ExpressionNode( build_field_name_fraction_constants( build_constantInteger( *$1 ), $2 ) ); }
463	\| FLOATINGconstant fraction_constants
464	{ $$ = new ExpressionNode( build_field_name_fraction_constants( build_field_name_FLOATINGconstant( *$1 ), $2 ) ); }
465	\| no_attr_identifier fraction_constants
466	{
467	if( ($1) == "0" \|\| ($1) == "1" ) {
468	$$ = new ExpressionNode( build_field_name_fraction_constants( build_constantZeroOne( *$1 ), $2 ) );
469	} else {
470	$$ = new ExpressionNode( build_field_name_fraction_constants( build_varref( $1 ), $2 ) );
471	}
472	}
473	;
474
475	fraction_constants:
476	// empty
477	{ $$ = nullptr; }
478	\| fraction_constants REALFRACTIONconstant
479	{
480	Expression * constant = build_field_name_REALFRACTIONconstant( *$2 );
481	$$ = $1 != nullptr ? new ExpressionNode( build_fieldSel( $1, constant ) ) : new ExpressionNode( constant );
482	}
483	;
484
485	unary_expression:
486	postfix_expression
487	// first location where constant/string can have operator applied: sizeof 3/sizeof "abc" still requires
488	// semantics checks, e.g., ++3, 3--, *3, &&3
489	\| constant
490	{ $$ = $1; }
491	\| string_literal
492	{ $$ = new ExpressionNode( $1 ); }
493	\| EXTENSION cast_expression // GCC
494	{ $$ = $2->set_extension( true ); }
495	// '*' ('&') is separated from unary_operator because of shift/reduce conflict in:
496	// { * X; } // dereference X
497	// { * int X; } // CFA declaration of pointer to int
498	\| ptrref_operator cast_expression // CFA
499	{
500	switch ( $1 ) {
501	case OperKinds::AddressOf:
502	$$ = new ExpressionNode( build_addressOf( $2 ) );
503	break;
504	case OperKinds::PointTo:
505	$$ = new ExpressionNode( build_unary_val( $1, $2 ) );
506	break;
507	default:
508	assert( false );
509	}
510	}
511	\| unary_operator cast_expression
512	{ $$ = new ExpressionNode( build_unary_val( $1, $2 ) ); }
513	\| ICR unary_expression
514	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::Incr, $2 ) ); }
515	\| DECR unary_expression
516	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::Decr, $2 ) ); }
517	\| SIZEOF unary_expression
518	{ $$ = new ExpressionNode( build_sizeOfexpr( $2 ) ); }
519	\| SIZEOF '(' type_name_no_function ')'
520	{ $$ = new ExpressionNode( build_sizeOftype( $3 ) ); }
521	\| ALIGNOF unary_expression // GCC, variable alignment
522	{ $$ = new ExpressionNode( build_alignOfexpr( $2 ) ); }
523	\| ALIGNOF '(' type_name_no_function ')' // GCC, type alignment
524	{ $$ = new ExpressionNode( build_alignOftype( $3 ) ); }
525	\| OFFSETOF '(' type_name_no_function ',' no_attr_identifier ')'
526	{ $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) ); }
527	\| ATTR_IDENTIFIER
528	{ $$ = new ExpressionNode( build_attrexpr( build_varref( $1 ), nullptr ) ); }
529	\| ATTR_IDENTIFIER '(' argument_expression ')'
530	{ $$ = new ExpressionNode( build_attrexpr( build_varref( $1 ), $3 ) ); }
531	\| ATTR_IDENTIFIER '(' type_name ')'
532	{ $$ = new ExpressionNode( build_attrtype( build_varref( $1 ), $3 ) ); }
533	// \| ANDAND IDENTIFIER // GCC, address of label
534	// { $$ = new ExpressionNode( new OperatorNode( OperKinds::LabelAddress ), new ExpressionNode( build_varref( $2, true ) ); }
535	;
536
537	ptrref_operator:
538	'*' { $$ = OperKinds::PointTo; }
539	\| '&' { $$ = OperKinds::AddressOf; }
540	// GCC, address of label must be handled by semantic check for ref,ref,label
541	// \| ANDAND { $$ = OperKinds::And; }
542	;
543
544	unary_operator:
545	'+' { $$ = OperKinds::UnPlus; }
546	\| '-' { $$ = OperKinds::UnMinus; }
547	\| '!' { $$ = OperKinds::Neg; }
548	\| '~' { $$ = OperKinds::BitNeg; }
549	;
550
551	cast_expression:
552	unary_expression
553	\| '(' type_name_no_function ')' cast_expression
554	{ $$ = new ExpressionNode( build_cast( $2, $4 ) ); }
555	// \| '(' type_name_no_function ')' tuple
556	// { $$ = new ExpressionNode( build_cast( $2, $4 ) ); }
557	;
558
559	multiplicative_expression:
560	cast_expression
561	\| multiplicative_expression '*' cast_expression
562	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Mul, $1, $3 ) ); }
563	\| multiplicative_expression '/' cast_expression
564	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Div, $1, $3 ) ); }
565	\| multiplicative_expression '%' cast_expression
566	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Mod, $1, $3 ) ); }
567	;
568
569	additive_expression:
570	multiplicative_expression
571	\| additive_expression '+' multiplicative_expression
572	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Plus, $1, $3 ) ); }
573	\| additive_expression '-' multiplicative_expression
574	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Minus, $1, $3 ) ); }
575	;
576
577	shift_expression:
578	additive_expression
579	\| shift_expression LS additive_expression
580	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LShift, $1, $3 ) ); }
581	\| shift_expression RS additive_expression
582	{ $$ = new ExpressionNode( build_binary_val( OperKinds::RShift, $1, $3 ) ); }
583	;
584
585	relational_expression:
586	shift_expression
587	\| relational_expression '<' shift_expression
588	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LThan, $1, $3 ) ); }
589	\| relational_expression '>' shift_expression
590	{ $$ = new ExpressionNode( build_binary_val( OperKinds::GThan, $1, $3 ) ); }
591	\| relational_expression LE shift_expression
592	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LEThan, $1, $3 ) ); }
593	\| relational_expression GE shift_expression
594	{ $$ = new ExpressionNode( build_binary_val( OperKinds::GEThan, $1, $3 ) ); }
595	;
596
597	equality_expression:
598	relational_expression
599	\| equality_expression EQ relational_expression
600	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Eq, $1, $3 ) ); }
601	\| equality_expression NE relational_expression
602	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Neq, $1, $3 ) ); }
603	;
604
605	AND_expression:
606	equality_expression
607	\| AND_expression '&' equality_expression
608	{ $$ = new ExpressionNode( build_binary_val( OperKinds::BitAnd, $1, $3 ) ); }
609	;
610
611	exclusive_OR_expression:
612	AND_expression
613	\| exclusive_OR_expression '^' AND_expression
614	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Xor, $1, $3 ) ); }
615	;
616
617	inclusive_OR_expression:
618	exclusive_OR_expression
619	\| inclusive_OR_expression '\|' exclusive_OR_expression
620	{ $$ = new ExpressionNode( build_binary_val( OperKinds::BitOr, $1, $3 ) ); }
621	;
622
623	logical_AND_expression:
624	inclusive_OR_expression
625	\| logical_AND_expression ANDAND inclusive_OR_expression
626	{ $$ = new ExpressionNode( build_and_or( $1, $3, true ) ); }
627	;
628
629	logical_OR_expression:
630	logical_AND_expression
631	\| logical_OR_expression OROR logical_AND_expression
632	{ $$ = new ExpressionNode( build_and_or( $1, $3, false ) ); }
633	;
634
635	conditional_expression:
636	logical_OR_expression
637	\| logical_OR_expression '?' comma_expression ':' conditional_expression
638	{ $$ = new ExpressionNode( build_cond( $1, $3, $5 ) ); }
639	// FIX ME: this hack computes $1 twice
640	\| logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
641	{ $$ = new ExpressionNode( build_cond( $1, $1, $4 ) ); }
642	// \| logical_OR_expression '?' comma_expression ':' tuple // CFA, tuple expression
643	// { $$ = new ExpressionNode( build_cond( $1, $3, $5 ) ); }
644	;
645
646	constant_expression:
647	conditional_expression
648	;
649
650	assignment_expression:
651	// CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
652	conditional_expression
653	\| unary_expression assignment_operator assignment_expression
654	{ $$ = new ExpressionNode( build_binary_ptr( $2, $1, $3 ) ); }
655	// \| tuple assignment_opt // CFA, tuple expression
656	// { $$ = ( $2 == 0 ) ? $1 : new ExpressionNode( build_binary_ptr( OperKinds::Assign, $1, $2 ) ); }
657	;
658
659	assignment_expression_opt:
660	// empty
661	{ $$ = nullptr; }
662	\| assignment_expression
663	;
664
665	assignment_operator:
666	'=' { $$ = OperKinds::Assign; }
667	\| ATassign { $$ = OperKinds::AtAssn; }
668	\| MULTassign { $$ = OperKinds::MulAssn; }
669	\| DIVassign { $$ = OperKinds::DivAssn; }
670	\| MODassign { $$ = OperKinds::ModAssn; }
671	\| PLUSassign { $$ = OperKinds::PlusAssn; }
672	\| MINUSassign { $$ = OperKinds::MinusAssn; }
673	\| LSassign { $$ = OperKinds::LSAssn; }
674	\| RSassign { $$ = OperKinds::RSAssn; }
675	\| ANDassign { $$ = OperKinds::AndAssn; }
676	\| ERassign { $$ = OperKinds::ERAssn; }
677	\| ORassign { $$ = OperKinds::OrAssn; }
678	;
679
680	tuple: // CFA, tuple
681	// CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
682	// comma_expression in cfa_identifier_parameter_array and cfa_abstract_array
683	// '[' ']'
684	// { $$ = new ExpressionNode( build_tuple() ); }
685	// '[' push assignment_expression pop ']'
686	// { $$ = new ExpressionNode( build_tuple( $3 ) ); }
687	'[' push ',' tuple_expression_list pop ']'
688	{ $$ = new ExpressionNode( build_tuple( (ExpressionNode *)(new ExpressionNode( nullptr ) )->set_last( $4 ) ) ); }
689	\| '[' push assignment_expression ',' tuple_expression_list pop ']'
690	{ $$ = new ExpressionNode( build_tuple( (ExpressionNode *)$3->set_last( $5 ) ) ); }
691	;
692
693	tuple_expression_list:
694	assignment_expression_opt
695	\| tuple_expression_list ',' assignment_expression_opt
696	{ $$ = (ExpressionNode *)$1->set_last( $3 ); }
697	;
698
699	comma_expression:
700	assignment_expression
701	\| comma_expression ',' assignment_expression
702	{ $$ = new ExpressionNode( build_comma( $1, $3 ) ); }
703	;
704
705	comma_expression_opt:
706	// empty
707	{ $$ = nullptr; }
708	\| comma_expression
709	;
710
711	//************************* STATEMENTS *****************************
712
713	statement:
714	labeled_statement
715	\| compound_statement
716	\| expression_statement { $$ = $1; }
717	\| selection_statement
718	\| iteration_statement
719	\| jump_statement
720	\| exception_statement
721	\| asm_statement
722	\| '^' postfix_expression '{' argument_expression_list '}' ';' // CFA
723	{
724	Token fn;
725	fn.str = new string( "^?{}" ); // location undefined
726	$$ = new StatementNode( build_expr( new ExpressionNode( build_func( new ExpressionNode( build_varref( fn ) ), (ExpressionNode *)( $2 )->set_last( $4 ) ) ) ) );
727	}
728	;
729
730	labeled_statement:
731	// labels cannot be identifiers 0 or 1 or ATTR_IDENTIFIER
732	identifier_or_type_name ':' attribute_list_opt statement
733	{
734	$$ = $4->add_label( $1, $3 );
735	}
736	;
737
738	compound_statement:
739	'{' '}'
740	{ $$ = new StatementNode( build_compound( (StatementNode *)0 ) ); }
741	\| '{'
742	// Two scopes are necessary because the block itself has a scope, but every declaration within the block also
743	// requires its own scope.
744	push push
745	local_label_declaration_opt // GCC, local labels
746	block_item_list // C99, intermix declarations and statements
747	pop '}'
748	{ $$ = new StatementNode( build_compound( $5 ) ); }
749	;
750
751	block_item_list: // C99
752	block_item
753	\| block_item_list push block_item
754	{ if ( $1 != 0 ) { $1->set_last( $3 ); $$ = $1; } }
755	;
756
757	block_item:
758	declaration // CFA, new & old style declarations
759	{ $$ = new StatementNode( $1 ); }
760	\| EXTENSION declaration // GCC
761	{
762	distExt( $2 );
763	$$ = new StatementNode( $2 );
764	}
765	\| function_definition
766	{ $$ = new StatementNode( $1 ); }
767	\| EXTENSION function_definition // GCC
768	{
769	distExt( $2 );
770	$$ = new StatementNode( $2 );
771	}
772	\| statement pop
773	;
774
775	statement_list:
776	statement
777	\| statement_list statement
778	{ if ( $1 != 0 ) { $1->set_last( $2 ); $$ = $1; } }
779	;
780
781	expression_statement:
782	comma_expression_opt ';'
783	{ $$ = new StatementNode( build_expr( $1 ) ); }
784	;
785
786	selection_statement:
787	IF '(' comma_expression ')' statement %prec THEN
788	// explicitly deal with the shift/reduce conflict on if/else
789	{ $$ = new StatementNode( build_if( $3, $5, nullptr ) ); }
790	\| IF '(' comma_expression ')' statement ELSE statement
791	{ $$ = new StatementNode( build_if( $3, $5, $7 ) ); }
792	\| SWITCH '(' comma_expression ')' case_clause // CFA
793	{ $$ = new StatementNode( build_switch( $3, $5 ) ); }
794	\| SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt '}' // CFA
795	{
796	StatementNode *sw = new StatementNode( build_switch( $3, $8 ) );
797	// The semantics of the declaration list is changed to include associated initialization, which is performed
798	// before the transfer to the appropriate case clause by hoisting the declarations into a compound
799	// statement around the switch. Statements after the initial declaration list can never be executed, and
800	// therefore, are removed from the grammar even though C allows it. The change also applies to choose
801	// statement.
802	$$ = $7 ? new StatementNode( build_compound( (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
803	}
804	\| CHOOSE '(' comma_expression ')' case_clause // CFA
805	{ $$ = new StatementNode( build_switch( $3, $5 ) ); }
806	\| CHOOSE '(' comma_expression ')' '{' push declaration_list_opt choose_clause_list_opt '}' // CFA
807	{
808	StatementNode *sw = new StatementNode( build_switch( $3, $8 ) );
809	$$ = $7 ? new StatementNode( build_compound( (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
810	}
811	;
812
813	// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
814	// clause allows a list of values and subranges.
815
816	case_value: // CFA
817	constant_expression { $$ = $1; }
818	\| constant_expression ELLIPSIS constant_expression // GCC, subrange
819	{ $$ = new ExpressionNode( build_range( $1, $3 ) ); }
820	\| subrange // CFA, subrange
821	;
822
823	case_value_list: // CFA
824	case_value { $$ = new StatementNode( build_case( $1 ) ); }
825	// convert case list, e.g., "case 1, 3, 5:" into "case 1: case 3: case 5"
826	\| case_value_list ',' case_value { $$ = (StatementNode *)($1->set_last( new StatementNode( build_case( $3 ) ) ) ); }
827	;
828
829	case_label: // CFA
830	CASE case_value_list ':' { $$ = $2; }
831	\| DEFAULT ':' { $$ = new StatementNode( build_default() ); }
832	// A semantic check is required to ensure only one default clause per switch/choose statement.
833	;
834
835	case_label_list: // CFA
836	case_label
837	\| case_label_list case_label { $$ = (StatementNode *)( $1->set_last( $2 )); }
838	;
839
840	case_clause: // CFA
841	case_label_list statement { $$ = $1->append_last_case( new StatementNode( build_compound( $2 ) ) ); }
842	;
843
844	switch_clause_list_opt: // CFA
845	// empty
846	{ $$ = nullptr; }
847	\| switch_clause_list
848	;
849
850	switch_clause_list: // CFA
851	case_label_list statement_list
852	{ $$ = $1->append_last_case( new StatementNode( build_compound( $2 ) ) ); }
853	\| switch_clause_list case_label_list statement_list
854	{ $$ = (StatementNode *)( $1->set_last( $2->append_last_case( new StatementNode( build_compound( $3 ) ) ) ) ); }
855	;
856
857	choose_clause_list_opt: // CFA
858	// empty
859	{ $$ = nullptr; }
860	\| choose_clause_list
861	;
862
863	choose_clause_list: // CFA
864	case_label_list fall_through
865	{ $$ = $1->append_last_case( $2 ); }
866	\| case_label_list statement_list fall_through_opt
867	{ $$ = $1->append_last_case( new StatementNode( build_compound( (StatementNode *)$2->set_last( $3 ) ) ) ); }
868	\| choose_clause_list case_label_list fall_through
869	{ $$ = (StatementNode *)( $1->set_last( $2->append_last_case( $3 ))); }
870	\| choose_clause_list case_label_list statement_list fall_through_opt
871	{ $$ = (StatementNode )( $1->set_last( $2->append_last_case( new StatementNode( build_compound( (StatementNode )$3->set_last( $4 ) ) ) ) ) ); }
872	;
873
874	fall_through_opt: // CFA
875	// empty
876	{ $$ = new StatementNode( build_branch( BranchStmt::Break ) ); } // insert implicit break
877	\| fall_through
878	;
879
880	fall_through: // CFA
881	FALLTHRU
882	{ $$ = nullptr; }
883	\| FALLTHRU ';'
884	{ $$ = nullptr; }
885	;
886
887	iteration_statement:
888	WHILE '(' comma_expression ')' statement
889	{ $$ = new StatementNode( build_while( $3, $5 ) ); }
890	\| DO statement WHILE '(' comma_expression ')' ';'
891	{ $$ = new StatementNode( build_while( $5, $2, true ) ); }
892	\| FOR '(' push for_control_expression ')' statement
893	{ $$ = new StatementNode( build_for( $4, $6 ) ); }
894	;
895
896	for_control_expression:
897	comma_expression_opt pop ';' comma_expression_opt ';' comma_expression_opt
898	{ $$ = new ForCtl( $1, $4, $6 ); }
899	\| declaration comma_expression_opt ';' comma_expression_opt // C99
900	{ $$ = new ForCtl( $1, $2, $4 ); }
901	;
902
903	jump_statement:
904	GOTO identifier_or_type_name ';'
905	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Goto ) ); }
906	\| GOTO '*' comma_expression ';' // GCC, computed goto
907	// The syntax for the GCC computed goto violates normal expression precedence, e.g., goto i+3; => goto (i+3);
908	// whereas normal operator precedence yields goto (*i)+3;
909	{ $$ = new StatementNode( build_computedgoto( $3 ) ); }
910	\| CONTINUE ';'
911	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
912	{ $$ = new StatementNode( build_branch( BranchStmt::Continue ) ); }
913	\| CONTINUE identifier_or_type_name ';' // CFA, multi-level continue
914	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
915	// the target of the transfer appears only at the start of an iteration statement.
916	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Continue ) ); }
917	\| BREAK ';'
918	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
919	{ $$ = new StatementNode( build_branch( BranchStmt::Break ) ); }
920	\| BREAK identifier_or_type_name ';' // CFA, multi-level exit
921	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
922	// the target of the transfer appears only at the start of an iteration statement.
923	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Break ) ); }
924	\| RETURN comma_expression_opt ';'
925	{ $$ = new StatementNode( build_return( $2 ) ); }
926	\| THROW assignment_expression_opt ';' // handles rethrow
927	{ $$ = new StatementNode( build_throw( $2 ) ); }
928	\| THROWRESUME assignment_expression_opt ';' // handles reresume
929	{ $$ = new StatementNode( build_throw( $2 ) ); }
930	\| THROWRESUME assignment_expression_opt AT assignment_expression ';' // handles reresume
931	{ $$ = new StatementNode( build_throw( $2 ) ); }
932	;
933
934	exception_statement:
935	TRY compound_statement handler_list
936	{ $$ = new StatementNode( build_try( $2, $3, 0 ) ); }
937	\| TRY compound_statement finally_clause
938	{ $$ = new StatementNode( build_try( $2, 0, $3 ) ); }
939	\| TRY compound_statement handler_list finally_clause
940	{ $$ = new StatementNode( build_try( $2, $3, $4 ) ); }
941	;
942
943	handler_list:
944	handler_clause
945	// ISO/IEC 9899:1999 Section 15.3(6 ) If present, a "..." handler shall be the last handler for its try block.
946	\| CATCH '(' ELLIPSIS ')' compound_statement
947	{ $$ = new StatementNode( build_catch( 0, $5, true ) ); }
948	\| handler_clause CATCH '(' ELLIPSIS ')' compound_statement
949	{ $$ = (StatementNode *)$1->set_last( new StatementNode( build_catch( 0, $6, true ) ) ); }
950	\| CATCHRESUME '(' ELLIPSIS ')' compound_statement
951	{ $$ = new StatementNode( build_catch( 0, $5, true ) ); }
952	\| handler_clause CATCHRESUME '(' ELLIPSIS ')' compound_statement
953	{ $$ = (StatementNode *)$1->set_last( new StatementNode( build_catch( 0, $6, true ) ) ); }
954	;
955
956	handler_clause:
957	CATCH '(' push push exception_declaration pop ')' compound_statement pop
958	{ $$ = new StatementNode( build_catch( $5, $8 ) ); }
959	\| handler_clause CATCH '(' push push exception_declaration pop ')' compound_statement pop
960	{ $$ = (StatementNode *)$1->set_last( new StatementNode( build_catch( $6, $9 ) ) ); }
961	\| CATCHRESUME '(' push push exception_declaration pop ')' compound_statement pop
962	{ $$ = new StatementNode( build_catch( $5, $8 ) ); }
963	\| handler_clause CATCHRESUME '(' push push exception_declaration pop ')' compound_statement pop
964	{ $$ = (StatementNode *)$1->set_last( new StatementNode( build_catch( $6, $9 ) ) ); }
965	;
966
967	finally_clause:
968	FINALLY compound_statement
969	{
970	$$ = new StatementNode( build_finally( $2 ) );
971	}
972	;
973
974	exception_declaration:
975	// No SUE declaration in parameter list.
976	type_specifier_nobody
977	\| type_specifier_nobody declarator
978	{
979	typedefTable.addToEnclosingScope( TypedefTable::ID );
980	$$ = $2->addType( $1 );
981	}
982	\| type_specifier_nobody variable_abstract_declarator
983	{ $$ = $2->addType( $1 ); }
984	\| cfa_abstract_declarator_tuple no_attr_identifier // CFA
985	{
986	typedefTable.addToEnclosingScope( TypedefTable::ID );
987	$$ = $1->addName( $2 );
988	}
989	\| cfa_abstract_declarator_tuple // CFA
990	;
991
992	asm_statement:
993	ASM asm_volatile_opt '(' string_literal ')' ';'
994	{ $$ = new StatementNode( build_asmstmt( $2, $4, 0 ) ); }
995	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ')' ';' // remaining GCC
996	{ $$ = new StatementNode( build_asmstmt( $2, $4, $6 ) ); }
997	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ')' ';'
998	{ $$ = new StatementNode( build_asmstmt( $2, $4, $6, $8 ) ); }
999	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
1000	{ $$ = new StatementNode( build_asmstmt( $2, $4, $6, $8, $10 ) ); }
1001	\| ASM asm_volatile_opt GOTO '(' string_literal ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
1002	{ $$ = new StatementNode( build_asmstmt( $2, $5, 0, $8, $10, $12 ) ); }
1003	;
1004
1005	asm_volatile_opt: // GCC
1006	// empty
1007	{ $$ = false; }
1008	\| VOLATILE
1009	{ $$ = true; }
1010	;
1011
1012	asm_operands_opt: // GCC
1013	// empty
1014	{ $$ = nullptr; } // use default argument
1015	\| asm_operands_list
1016	;
1017
1018	asm_operands_list: // GCC
1019	asm_operand
1020	\| asm_operands_list ',' asm_operand
1021	{ $$ = (ExpressionNode *)$1->set_last( $3 ); }
1022	;
1023
1024	asm_operand: // GCC
1025	string_literal '(' constant_expression ')'
1026	{ $$ = new ExpressionNode( build_asmexpr( 0, $1, $3 ) ); }
1027	\| '[' constant_expression ']' string_literal '(' constant_expression ')'
1028	{ $$ = new ExpressionNode( build_asmexpr( $2, $4, $6 ) ); }
1029	;
1030
1031	asm_clobbers_list_opt: // GCC
1032	// empty
1033	{ $$ = nullptr; } // use default argument
1034	\| string_literal
1035	{ $$ = new ExpressionNode( $1 ); }
1036	\| asm_clobbers_list_opt ',' string_literal
1037	// set_last return ParseNode *
1038	{ $$ = (ExpressionNode *)$1->set_last( new ExpressionNode( $3 ) ); }
1039	;
1040
1041	label_list:
1042	no_attr_identifier
1043	{
1044	$$ = new LabelNode(); $$->labels.push_back( *$1 );
1045	delete $1; // allocated by lexer
1046	}
1047	\| label_list ',' no_attr_identifier
1048	{
1049	$$ = $1; $1->labels.push_back( *$3 );
1050	delete $3; // allocated by lexer
1051	}
1052	;
1053
1054	//***************************** DECLARATIONS *******************************
1055
1056	declaration_list_opt: // used at beginning of switch statement
1057	pop
1058	{ $$ = nullptr; }
1059	\| declaration_list
1060	;
1061
1062	declaration_list:
1063	declaration
1064	\| declaration_list push declaration
1065	{ $$ = $1->appendList( $3 ); }
1066	;
1067
1068	KR_declaration_list_opt: // used to declare parameter types in K&R style functions
1069	pop
1070	{ $$ = nullptr; }
1071	\| KR_declaration_list
1072	;
1073
1074	KR_declaration_list:
1075	c_declaration
1076	\| KR_declaration_list push c_declaration
1077	{ $$ = $1->appendList( $3 ); }
1078	;
1079
1080	local_label_declaration_opt: // GCC, local label
1081	// empty
1082	\| local_label_declaration_list
1083	;
1084
1085	local_label_declaration_list: // GCC, local label
1086	LABEL local_label_list ';'
1087	\| local_label_declaration_list LABEL local_label_list ';'
1088	;
1089
1090	local_label_list: // GCC, local label
1091	no_attr_identifier_or_type_name {}
1092	\| local_label_list ',' no_attr_identifier_or_type_name {}
1093	;
1094
1095	declaration: // CFA, new & old style declarations
1096	cfa_declaration
1097	\| c_declaration
1098	;
1099
1100	// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
1101	// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
1102	// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
1103	// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
1104	// the declaration list (as in Pascal). ANSI C and the new CFA declarations may appear together in the same program
1105	// block, but cannot be mixed within a specific declaration.
1106	//
1107	// CFA C
1108	// [10] int x; int x[10]; // array of 10 integers
1109	// [10] * char y; char *y[10]; // array of 10 pointers to char
1110
1111	cfa_declaration: // CFA
1112	cfa_variable_declaration pop ';'
1113	\| cfa_typedef_declaration pop ';'
1114	\| cfa_function_declaration pop ';'
1115	\| type_declaring_list pop ';'
1116	\| trait_specifier pop ';'
1117	;
1118
1119	cfa_variable_declaration: // CFA
1120	cfa_variable_specifier initializer_opt
1121	{
1122	typedefTable.addToEnclosingScope( TypedefTable::ID );
1123	$$ = $1->addInitializer( $2 );
1124	}
1125	\| declaration_qualifier_list cfa_variable_specifier initializer_opt
1126	// declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
1127	// them as a type_qualifier cannot appear in that context.
1128	{
1129	typedefTable.addToEnclosingScope( TypedefTable::ID );
1130	$$ = $2->addQualifiers( $1 )->addInitializer( $3 );;
1131	}
1132	\| cfa_variable_declaration pop ',' push identifier_or_type_name initializer_opt
1133	{
1134	typedefTable.addToEnclosingScope( *$5, TypedefTable::ID );
1135	$$ = $1->appendList( $1->cloneType( $5 )->addInitializer( $6 ) );
1136	}
1137	;
1138
1139	cfa_variable_specifier: // CFA
1140	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1141	// storage-class
1142	cfa_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
1143	{
1144	typedefTable.setNextIdentifier( *$2 );
1145	$$ = $1->addName( $2 )->addAsmName( $3 );
1146	}
1147	\| cfa_abstract_tuple identifier_or_type_name asm_name_opt
1148	{
1149	typedefTable.setNextIdentifier( *$2 );
1150	$$ = $1->addName( $2 )->addAsmName( $3 );
1151	}
1152	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name asm_name_opt
1153	{
1154	typedefTable.setNextIdentifier( *$3 );
1155	$$ = $2->addQualifiers( $1 )->addName( $3 )->addAsmName( $4 );
1156	}
1157	;
1158
1159	cfa_function_declaration: // CFA
1160	cfa_function_specifier
1161	{
1162	typedefTable.addToEnclosingScope( TypedefTable::ID );
1163	$$ = $1;
1164	}
1165	\| type_qualifier_list cfa_function_specifier
1166	{
1167	typedefTable.addToEnclosingScope( TypedefTable::ID );
1168	$$ = $2->addQualifiers( $1 );
1169	}
1170	\| declaration_qualifier_list cfa_function_specifier
1171	{
1172	typedefTable.addToEnclosingScope( TypedefTable::ID );
1173	$$ = $2->addQualifiers( $1 );
1174	}
1175	\| declaration_qualifier_list type_qualifier_list cfa_function_specifier
1176	{
1177	typedefTable.addToEnclosingScope( TypedefTable::ID );
1178	$$ = $3->addQualifiers( $1 )->addQualifiers( $2 );
1179	}
1180	\| cfa_function_declaration pop ',' push identifier_or_type_name
1181	{
1182	typedefTable.addToEnclosingScope( *$5, TypedefTable::ID );
1183	$$ = $1->appendList( $1->cloneType( $5 ) );
1184	}
1185	;
1186
1187	cfa_function_specifier: // CFA
1188	// '[' ']' identifier_or_type_name '(' push cfa_parameter_type_list_opt pop ')' // S/R conflict
1189	// {
1190	// $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( 0 ), $6, 0, true );
1191	// }
1192	// '[' ']' identifier '(' push cfa_parameter_type_list_opt pop ')'
1193	// {
1194	// typedefTable.setNextIdentifier( *$5 );
1195	// $$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
1196	// }
1197	// \| '[' ']' TYPEDEFname '(' push cfa_parameter_type_list_opt pop ')'
1198	// {
1199	// typedefTable.setNextIdentifier( *$5 );
1200	// $$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
1201	// }
1202	// \| '[' ']' typegen_name
1203	// identifier_or_type_name must be broken apart because of the sequence:
1204	//
1205	// '[' ']' identifier_or_type_name '(' cfa_parameter_type_list_opt ')'
1206	// '[' ']' type_specifier
1207	//
1208	// type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
1209	// flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
1210	cfa_abstract_tuple identifier_or_type_name '(' push cfa_parameter_type_list_opt pop ')'
1211	// To obtain LR(1 ), this rule must be factored out from function return type (see cfa_abstract_declarator).
1212	{
1213	$$ = DeclarationNode::newFunction( $2, $1, $5, 0, true );
1214	}
1215	\| cfa_function_return identifier_or_type_name '(' push cfa_parameter_type_list_opt pop ')'
1216	{
1217	$$ = DeclarationNode::newFunction( $2, $1, $5, 0, true );
1218	}
1219	;
1220
1221	cfa_function_return: // CFA
1222	'[' push cfa_parameter_list pop ']'
1223	{ $$ = DeclarationNode::newTuple( $3 ); }
1224	\| '[' push cfa_parameter_list pop ',' push cfa_abstract_parameter_list pop ']'
1225	// To obtain LR(1 ), the last cfa_abstract_parameter_list is added into this flattened rule to lookahead to the
1226	// ']'.
1227	{ $$ = DeclarationNode::newTuple( $3->appendList( $7 ) ); }
1228	;
1229
1230	cfa_typedef_declaration: // CFA
1231	TYPEDEF cfa_variable_specifier
1232	{
1233	typedefTable.addToEnclosingScope( TypedefTable::TD );
1234	$$ = $2->addTypedef();
1235	}
1236	\| TYPEDEF cfa_function_specifier
1237	{
1238	typedefTable.addToEnclosingScope( TypedefTable::TD );
1239	$$ = $2->addTypedef();
1240	}
1241	\| cfa_typedef_declaration pop ',' push no_attr_identifier
1242	{
1243	typedefTable.addToEnclosingScope( *$5, TypedefTable::TD );
1244	$$ = $1->appendList( $1->cloneType( $5 ) );
1245	}
1246	;
1247
1248	// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
1249	// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.
1250
1251	typedef_declaration:
1252	TYPEDEF type_specifier declarator
1253	{
1254	typedefTable.addToEnclosingScope( TypedefTable::TD );
1255	$$ = $3->addType( $2 )->addTypedef();
1256	}
1257	\| typedef_declaration pop ',' push declarator
1258	{
1259	typedefTable.addToEnclosingScope( TypedefTable::TD );
1260	$$ = $1->appendList( $1->cloneBaseType( $5 )->addTypedef() );
1261	}
1262	\| type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
1263	{
1264	typedefTable.addToEnclosingScope( TypedefTable::TD );
1265	$$ = $4->addType( $3 )->addQualifiers( $1 )->addTypedef();
1266	}
1267	\| type_specifier TYPEDEF declarator
1268	{
1269	typedefTable.addToEnclosingScope( TypedefTable::TD );
1270	$$ = $3->addType( $1 )->addTypedef();
1271	}
1272	\| type_specifier TYPEDEF type_qualifier_list declarator
1273	{
1274	typedefTable.addToEnclosingScope( TypedefTable::TD );
1275	$$ = $4->addQualifiers( $1 )->addTypedef()->addType( $1 );
1276	}
1277	;
1278
1279	typedef_expression:
1280	// GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
1281	TYPEDEF no_attr_identifier '=' assignment_expression
1282	{
1283	typedefTable.addToEnclosingScope( *$2, TypedefTable::TD );
1284	$$ = DeclarationNode::newName( 0 ); // unimplemented
1285	}
1286	\| typedef_expression pop ',' push no_attr_identifier '=' assignment_expression
1287	{
1288	typedefTable.addToEnclosingScope( *$5, TypedefTable::TD );
1289	$$ = DeclarationNode::newName( 0 ); // unimplemented
1290	}
1291	;
1292
1293	//c_declaration:
1294	// declaring_list pop ';'
1295	// \| typedef_declaration pop ';'
1296	// \| typedef_expression pop ';' // GCC, naming expression type
1297	// \| sue_declaration_specifier pop ';'
1298	// ;
1299	//
1300	//declaring_list:
1301	// // A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1302	// // storage-class
1303	// declarator asm_name_opt initializer_opt
1304	// {
1305	// typedefTable.addToEnclosingScope( TypedefTable::ID );
1306	// $$ = ( $2->addType( $1 ))->addAsmName( $3 )->addInitializer( $4 );
1307	// }
1308	// \| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
1309	// {
1310	// typedefTable.addToEnclosingScope( TypedefTable::ID );
1311	// $$ = $1->appendList( $1->cloneBaseType( $4->addAsmName( $5 )->addInitializer( $6 ) ) );
1312	// }
1313	// ;
1314
1315	c_declaration:
1316	declaration_specifier declaring_list pop ';'
1317	{
1318	$$ = distAttr( $1, $2 );
1319	}
1320	\| typedef_declaration pop ';'
1321	\| typedef_expression pop ';' // GCC, naming expression type
1322	\| sue_declaration_specifier pop ';'
1323	;
1324
1325	declaring_list:
1326	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1327	// storage-class
1328	declarator asm_name_opt initializer_opt
1329	{
1330	typedefTable.addToEnclosingScope( TypedefTable::ID );
1331	$$ = $1->addAsmName( $2 )->addInitializer( $3 );
1332	}
1333	\| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
1334	{
1335	typedefTable.addToEnclosingScope( TypedefTable::ID );
1336	$$ = $1->appendList( $4->addQualifiers( $3 )->addAsmName( $5 )->addInitializer( $6 ) );
1337	}
1338	;
1339
1340	declaration_specifier: // type specifier + storage class
1341	basic_declaration_specifier
1342	\| sue_declaration_specifier
1343	\| typedef_declaration_specifier
1344	\| typegen_declaration_specifier
1345	;
1346
1347	declaration_specifier_nobody: // type specifier + storage class - {...}
1348	// Preclude SUE declarations in restricted scopes:
1349	//
1350	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
1351	//
1352	// because it is impossible to call f due to name equivalence.
1353	basic_declaration_specifier
1354	\| sue_declaration_specifier_nobody
1355	\| typedef_declaration_specifier
1356	\| typegen_declaration_specifier
1357	;
1358
1359	type_specifier: // type specifier
1360	basic_type_specifier
1361	\| sue_type_specifier
1362	\| typedef_type_specifier
1363	\| typegen_type_specifier
1364	;
1365
1366	type_specifier_nobody: // type specifier - {...}
1367	// Preclude SUE declarations in restricted scopes:
1368	//
1369	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
1370	//
1371	// because it is impossible to call f due to name equivalence.
1372	basic_type_specifier
1373	\| sue_type_specifier_nobody
1374	\| typedef_type_specifier
1375	\| typegen_type_specifier
1376	;
1377
1378	type_qualifier_list_opt: // GCC, used in asm_statement
1379	// empty
1380	{ $$ = nullptr; }
1381	\| type_qualifier_list
1382	;
1383
1384	type_qualifier_list:
1385	// A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
1386	//
1387	// ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
1388	// specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
1389	// appeared only once.
1390	type_qualifier
1391	\| type_qualifier_list type_qualifier
1392	{ $$ = $1->addQualifiers( $2 ); }
1393	;
1394
1395	type_qualifier:
1396	type_qualifier_name
1397	\| attribute
1398	;
1399
1400	type_qualifier_name:
1401	CONST
1402	{ $$ = DeclarationNode::newTypeQualifier( DeclarationNode::Const ); }
1403	\| RESTRICT
1404	{ $$ = DeclarationNode::newTypeQualifier( DeclarationNode::Restrict ); }
1405	\| VOLATILE
1406	{ $$ = DeclarationNode::newTypeQualifier( DeclarationNode::Volatile ); }
1407	\| LVALUE // CFA
1408	{ $$ = DeclarationNode::newTypeQualifier( DeclarationNode::Lvalue ); }
1409	\| ATOMIC
1410	{ $$ = DeclarationNode::newTypeQualifier( DeclarationNode::Atomic ); }
1411	\| FORALL '('
1412	{
1413	typedefTable.enterScope();
1414	}
1415	type_parameter_list ')' // CFA
1416	{
1417	typedefTable.leaveScope();
1418	$$ = DeclarationNode::newForall( $4 );
1419	}
1420	;
1421
1422	declaration_qualifier_list:
1423	storage_class_list
1424	\| type_qualifier_list storage_class_list // remaining OBSOLESCENT (see 2 )
1425	{ $$ = $1->addQualifiers( $2 ); }
1426	\| declaration_qualifier_list type_qualifier_list storage_class_list
1427	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1428	;
1429
1430	storage_class_list:
1431	// A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
1432	// only one of each is specified, except for inline, which can appear with the others.
1433	//
1434	// ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
1435	// specifiers in a declaration.
1436	storage_class
1437	\| storage_class_list storage_class
1438	{ $$ = $1->addQualifiers( $2 ); }
1439	;
1440
1441	storage_class:
1442	EXTERN
1443	{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Extern ); }
1444	\| STATIC
1445	{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Static ); }
1446	\| AUTO
1447	{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Auto ); }
1448	\| REGISTER
1449	{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Register ); }
1450	\| THREADLOCAL // C11
1451	{ $$ = DeclarationNode::newStorageClass( DeclarationNode::Threadlocal ); }
1452	// Put function specifiers here to simplify parsing rules, but separate them semantically.
1453	\| INLINE // C99
1454	{ $$ = DeclarationNode::newFuncSpecifier( DeclarationNode::Inline ); }
1455	\| FORTRAN // C99
1456	{ $$ = DeclarationNode::newFuncSpecifier( DeclarationNode::Fortran ); }
1457	\| NORETURN // C11
1458	{ $$ = DeclarationNode::newFuncSpecifier( DeclarationNode::Noreturn ); }
1459	;
1460
1461	basic_type_name:
1462	CHAR
1463	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Char ); }
1464	\| DOUBLE
1465	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Double ); }
1466	\| FLOAT
1467	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float ); }
1468	\| INT
1469	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int ); }
1470	\| LONG
1471	{ $$ = DeclarationNode::newLength( DeclarationNode::Long ); }
1472	\| SHORT
1473	{ $$ = DeclarationNode::newLength( DeclarationNode::Short ); }
1474	\| SIGNED
1475	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Signed ); }
1476	\| UNSIGNED
1477	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Unsigned ); }
1478	\| VOID
1479	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
1480	\| BOOL // C99
1481	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Bool ); }
1482	\| COMPLEX // C99
1483	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Complex ); }
1484	\| IMAGINARY // C99
1485	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Imaginary ); }
1486	\| VALIST // GCC, __builtin_va_list
1487	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Valist ); }
1488	\| ZERO_T
1489	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Zero ); }
1490	\| ONE_T
1491	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::One ); }
1492	;
1493
1494	basic_declaration_specifier:
1495	// A semantic check is necessary for conflicting storage classes.
1496	basic_type_specifier
1497	\| declaration_qualifier_list basic_type_specifier
1498	{ $$ = $2->addQualifiers( $1 ); }
1499	\| basic_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1500	{ $$ = $1->addQualifiers( $2 ); }
1501	\| basic_declaration_specifier storage_class type_qualifier_list
1502	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1503	\| basic_declaration_specifier storage_class basic_type_specifier
1504	{ $$ = $3->addQualifiers( $2 )->addType( $1 ); }
1505	;
1506
1507	basic_type_specifier:
1508	direct_type_name
1509	\| type_qualifier_list_opt indirect_type_name type_qualifier_list_opt
1510	{ $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
1511	;
1512
1513	direct_type_name:
1514	// A semantic check is necessary for conflicting type qualifiers.
1515	basic_type_name
1516	\| type_qualifier_list basic_type_name
1517	{ $$ = $2->addQualifiers( $1 ); }
1518	\| direct_type_name type_qualifier
1519	{ $$ = $1->addQualifiers( $2 ); }
1520	\| direct_type_name basic_type_name
1521	{ $$ = $1->addType( $2 ); }
1522	;
1523
1524	indirect_type_name:
1525	TYPEOF '(' type_name ')' // GCC: typeof(x) y;
1526	{ $$ = $3; }
1527	\| TYPEOF '(' comma_expression ')' // GCC: typeof(a+b) y;
1528	{ $$ = DeclarationNode::newTypeof( $3 ); }
1529	\| ATTR_TYPEGENname '(' type_name ')' // CFA: e.g., @type(x) y;
1530	{ $$ = DeclarationNode::newAttr( $1, $3 ); }
1531	\| ATTR_TYPEGENname '(' comma_expression ')' // CFA: e.g., @type(a+b) y;
1532	{ $$ = DeclarationNode::newAttr( $1, $3 ); }
1533	;
1534
1535	sue_declaration_specifier: // struct, union, enum + storage class + type specifier
1536	sue_type_specifier
1537	\| declaration_qualifier_list sue_type_specifier
1538	{ $$ = $2->addQualifiers( $1 ); }
1539	\| sue_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1540	{ $$ = $1->addQualifiers( $2 ); }
1541	\| sue_declaration_specifier storage_class type_qualifier_list
1542	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1543	;
1544
1545	sue_type_specifier: // struct, union, enum + type specifier
1546	elaborated_type
1547	\| type_qualifier_list elaborated_type
1548	{ $$ = $2->addQualifiers( $1 ); }
1549	\| sue_type_specifier type_qualifier
1550	{ $$ = $1->addQualifiers( $2 ); }
1551	;
1552
1553	sue_declaration_specifier_nobody: // struct, union, enum - {...} + storage class + type specifier
1554	sue_type_specifier_nobody
1555	\| declaration_qualifier_list sue_type_specifier_nobody
1556	{ $$ = $2->addQualifiers( $1 ); }
1557	\| sue_declaration_specifier_nobody storage_class // remaining OBSOLESCENT (see 2)
1558	{ $$ = $1->addQualifiers( $2 ); }
1559	\| sue_declaration_specifier_nobody storage_class type_qualifier_list
1560	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1561	;
1562
1563	sue_type_specifier_nobody: // struct, union, enum - {...} + type specifier
1564	elaborated_type_nobody
1565	\| type_qualifier_list elaborated_type_nobody
1566	{ $$ = $2->addQualifiers( $1 ); }
1567	\| sue_type_specifier_nobody type_qualifier
1568	{ $$ = $1->addQualifiers( $2 ); }
1569	;
1570
1571	typedef_declaration_specifier:
1572	typedef_type_specifier
1573	\| declaration_qualifier_list typedef_type_specifier
1574	{ $$ = $2->addQualifiers( $1 ); }
1575	\| typedef_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1576	{ $$ = $1->addQualifiers( $2 ); }
1577	\| typedef_declaration_specifier storage_class type_qualifier_list
1578	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1579	;
1580
1581	typedef_type_specifier: // typedef types
1582	TYPEDEFname
1583	{ $$ = DeclarationNode::newFromTypedef( $1 ); }
1584	\| type_qualifier_list TYPEDEFname
1585	{ $$ = DeclarationNode::newFromTypedef( $2 )->addQualifiers( $1 ); }
1586	\| typedef_type_specifier type_qualifier
1587	{ $$ = $1->addQualifiers( $2 ); }
1588	;
1589
1590	elaborated_type: // struct, union, enum
1591	aggregate_type
1592	\| enum_type
1593	;
1594
1595	elaborated_type_nobody: // struct, union, enum - {...}
1596	aggregate_type_nobody
1597	\| enum_type_nobody
1598	;
1599
1600	aggregate_type: // struct, union
1601	aggregate_key attribute_list_opt '{' field_declaration_list '}'
1602	{ $$ = DeclarationNode::newAggregate( $1, nullptr, nullptr, $4, true )->addQualifiers( $2 ); }
1603	\| aggregate_key attribute_list_opt no_attr_identifier_or_type_name
1604	{ typedefTable.makeTypedef( *$3 ); }
1605	'{' field_declaration_list '}'
1606	{ $$ = DeclarationNode::newAggregate( $1, $3, nullptr, $6, true )->addQualifiers( $2 ); }
1607	\| aggregate_key attribute_list_opt '(' type_name_list ')' '{' field_declaration_list '}' // CFA
1608	{ $$ = DeclarationNode::newAggregate( $1, nullptr, $4, $7, false )->addQualifiers( $2 ); }
1609	\| aggregate_type_nobody
1610	;
1611
1612	aggregate_type_nobody: // struct, union - {...}
1613	aggregate_key attribute_list_opt no_attr_identifier_or_type_name
1614	{
1615	typedefTable.makeTypedef( *$3 );
1616	$$ = DeclarationNode::newAggregate( $1, $3, nullptr, nullptr, false )->addQualifiers( $2 );
1617	}
1618	\| aggregate_key attribute_list_opt typegen_name // CFA, S/R conflict
1619	{ $$ = $3->addQualifiers( $2 ); }
1620	;
1621
1622	aggregate_key:
1623	STRUCT
1624	{ $$ = DeclarationNode::Struct; }
1625	\| UNION
1626	{ $$ = DeclarationNode::Union; }
1627	;
1628
1629	field_declaration_list:
1630	// empty
1631	{ $$ = nullptr; }
1632	\| field_declaration_list field_declaration
1633	{ $$ = $1 ? $1->appendList( $2 ) : $2; }
1634	;
1635
1636	field_declaration:
1637	cfa_field_declaring_list ';' // CFA, new style field declaration
1638	\| EXTENSION cfa_field_declaring_list ';' // GCC
1639	{
1640	distExt( $2 ); // mark all fields in list
1641	$$ = $2;
1642	}
1643	\| type_specifier field_declaring_list ';'
1644	{
1645	$$ = distAttr( $1, $2 ); }
1646	\| EXTENSION type_specifier field_declaring_list ';' // GCC
1647	{
1648	distExt( $3 ); // mark all fields in list
1649	$$ = distAttr( $2, $3 );
1650	}
1651	;
1652
1653	cfa_field_declaring_list: // CFA, new style field declaration
1654	cfa_abstract_declarator_tuple // CFA, no field name
1655	\| cfa_abstract_declarator_tuple no_attr_identifier_or_type_name
1656	{ $$ = $1->addName( $2 ); }
1657	\| cfa_field_declaring_list ',' no_attr_identifier_or_type_name
1658	{ $$ = $1->appendList( $1->cloneType( $3 ) ); }
1659	\| cfa_field_declaring_list ',' // CFA, no field name
1660	{ $$ = $1->appendList( $1->cloneType( 0 ) ); }
1661	;
1662
1663	field_declaring_list:
1664	field_declarator
1665	\| field_declaring_list ',' attribute_list_opt field_declarator
1666	{ $$ = $1->appendList( $4->addQualifiers( $3 ) ); }
1667	;
1668
1669	field_declarator:
1670	// empty
1671	{ $$ = DeclarationNode::newName( 0 ); /* XXX */ } // CFA, no field name
1672	\| bit_subrange_size // no field name
1673	{ $$ = DeclarationNode::newBitfield( $1 ); }
1674	\| variable_declarator bit_subrange_size_opt
1675	// A semantic check is required to ensure bit_subrange only appears on base type int.
1676	{ $$ = $1->addBitfield( $2 ); }
1677	\| variable_type_redeclarator bit_subrange_size_opt
1678	// A semantic check is required to ensure bit_subrange only appears on base type int.
1679	{ $$ = $1->addBitfield( $2 ); }
1680	\| variable_abstract_declarator // CFA, no field name
1681	;
1682
1683	bit_subrange_size_opt:
1684	// empty
1685	{ $$ = nullptr; }
1686	\| bit_subrange_size
1687	{ $$ = $1; }
1688	;
1689
1690	bit_subrange_size:
1691	':' constant_expression
1692	{ $$ = $2; }
1693	;
1694
1695	enum_type: // enum
1696	ENUM attribute_list_opt '{' enumerator_list comma_opt '}'
1697	{ $$ = DeclarationNode::newEnum( nullptr, $4, true )->addQualifiers( $2 ); }
1698	\| ENUM attribute_list_opt no_attr_identifier_or_type_name
1699	{ typedefTable.makeTypedef( *$3 ); }
1700	'{' enumerator_list comma_opt '}'
1701	{ $$ = DeclarationNode::newEnum( $3, $6, true )->addQualifiers( $2 ); }
1702	\| enum_type_nobody
1703	;
1704
1705	enum_type_nobody: // enum - {...}
1706	ENUM attribute_list_opt no_attr_identifier_or_type_name
1707	{
1708	typedefTable.makeTypedef( *$3 );
1709	$$ = DeclarationNode::newEnum( $3, 0, false )->addQualifiers( $2 );
1710	}
1711	;
1712
1713	enumerator_list:
1714	no_attr_identifier_or_type_name enumerator_value_opt
1715	{ $$ = DeclarationNode::newEnumConstant( $1, $2 ); }
1716	\| enumerator_list ',' no_attr_identifier_or_type_name enumerator_value_opt
1717	{ $$ = $1->appendList( DeclarationNode::newEnumConstant( $3, $4 ) ); }
1718	;
1719
1720	enumerator_value_opt:
1721	// empty
1722	{ $$ = nullptr; }
1723	\| '=' constant_expression
1724	{ $$ = $2; }
1725	;
1726
1727	// Minimum of one parameter after which ellipsis is allowed only at the end.
1728
1729	cfa_parameter_type_list_opt: // CFA
1730	// empty
1731	{ $$ = nullptr; }
1732	\| cfa_parameter_type_list
1733	;
1734
1735	cfa_parameter_type_list: // CFA, abstract + real
1736	cfa_abstract_parameter_list
1737	\| cfa_parameter_list
1738	\| cfa_parameter_list pop ',' push cfa_abstract_parameter_list
1739	{ $$ = $1->appendList( $5 ); }
1740	\| cfa_abstract_parameter_list pop ',' push ELLIPSIS
1741	{ $$ = $1->addVarArgs(); }
1742	\| cfa_parameter_list pop ',' push ELLIPSIS
1743	{ $$ = $1->addVarArgs(); }
1744	;
1745
1746	cfa_parameter_list: // CFA
1747	// To obtain LR(1) between cfa_parameter_list and cfa_abstract_tuple, the last cfa_abstract_parameter_list is
1748	// factored out from cfa_parameter_list, flattening the rules to get lookahead to the ']'.
1749	cfa_parameter_declaration
1750	\| cfa_abstract_parameter_list pop ',' push cfa_parameter_declaration
1751	{ $$ = $1->appendList( $5 ); }
1752	\| cfa_parameter_list pop ',' push cfa_parameter_declaration
1753	{ $$ = $1->appendList( $5 ); }
1754	\| cfa_parameter_list pop ',' push cfa_abstract_parameter_list pop ',' push cfa_parameter_declaration
1755	{ $$ = $1->appendList( $5 )->appendList( $9 ); }
1756	;
1757
1758	cfa_abstract_parameter_list: // CFA, new & old style abstract
1759	cfa_abstract_parameter_declaration
1760	\| cfa_abstract_parameter_list pop ',' push cfa_abstract_parameter_declaration
1761	{ $$ = $1->appendList( $5 ); }
1762	;
1763
1764	parameter_type_list_opt:
1765	// empty
1766	{ $$ = nullptr; }
1767	\| parameter_type_list
1768	;
1769
1770	parameter_type_list:
1771	parameter_list
1772	\| parameter_list pop ',' push ELLIPSIS
1773	{ $$ = $1->addVarArgs(); }
1774	;
1775
1776	parameter_list: // abstract + real
1777	abstract_parameter_declaration
1778	\| parameter_declaration
1779	\| parameter_list pop ',' push abstract_parameter_declaration
1780	{ $$ = $1->appendList( $5 ); }
1781	\| parameter_list pop ',' push parameter_declaration
1782	{ $$ = $1->appendList( $5 ); }
1783	;
1784
1785	// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
1786	// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.
1787
1788	cfa_parameter_declaration: // CFA, new & old style parameter declaration
1789	parameter_declaration
1790	\| cfa_identifier_parameter_declarator_no_tuple identifier_or_type_name assignment_opt
1791	{ $$ = $1->addName( $2 ); }
1792	\| cfa_abstract_tuple identifier_or_type_name assignment_opt
1793	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
1794	{ $$ = $1->addName( $2 ); }
1795	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name assignment_opt
1796	{ $$ = $2->addName( $3 )->addQualifiers( $1 ); }
1797	\| cfa_function_specifier
1798	;
1799
1800	cfa_abstract_parameter_declaration: // CFA, new & old style parameter declaration
1801	abstract_parameter_declaration
1802	\| cfa_identifier_parameter_declarator_no_tuple
1803	\| cfa_abstract_tuple
1804	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
1805	\| type_qualifier_list cfa_abstract_tuple
1806	{ $$ = $2->addQualifiers( $1 ); }
1807	\| cfa_abstract_function
1808	;
1809
1810	parameter_declaration:
1811	// No SUE declaration in parameter list.
1812	declaration_specifier_nobody identifier_parameter_declarator assignment_opt
1813	{
1814	typedefTable.addToEnclosingScope( TypedefTable::ID );
1815	$$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr );
1816	}
1817	\| declaration_specifier_nobody type_parameter_redeclarator assignment_opt
1818	{
1819	typedefTable.addToEnclosingScope( TypedefTable::ID );
1820	$$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr );
1821	}
1822	;
1823
1824	abstract_parameter_declaration:
1825	declaration_specifier_nobody assignment_opt
1826	{ $$ = $1->addInitializer( $2 ? new InitializerNode( $2 ) : nullptr ); }
1827	\| declaration_specifier_nobody abstract_parameter_declarator assignment_opt
1828	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
1829	;
1830
1831	// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
1832	// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
1833	// identifiers. The ANSI-style parameter-list can redefine a typedef name.
1834
1835	identifier_list: // K&R-style parameter list => no types
1836	no_attr_identifier
1837	{ $$ = DeclarationNode::newName( $1 ); }
1838	\| identifier_list ',' no_attr_identifier
1839	{ $$ = $1->appendList( DeclarationNode::newName( $3 ) ); }
1840	;
1841
1842	identifier_or_type_name:
1843	identifier
1844	\| TYPEDEFname
1845	\| TYPEGENname
1846	;
1847
1848	no_01_identifier_or_type_name:
1849	no_01_identifier
1850	\| TYPEDEFname
1851	\| TYPEGENname
1852	;
1853
1854	no_attr_identifier_or_type_name:
1855	no_attr_identifier
1856	\| TYPEDEFname
1857	\| TYPEGENname
1858	;
1859
1860	type_name_no_function: // sizeof, alignof, cast (constructor)
1861	cfa_abstract_declarator_tuple // CFA
1862	\| type_specifier
1863	\| type_specifier abstract_declarator
1864	{ $$ = $2->addType( $1 ); }
1865	;
1866
1867	type_name: // typeof, assertion
1868	type_name_no_function
1869	\| cfa_abstract_function // CFA
1870	;
1871
1872	initializer_opt:
1873	// empty
1874	{ $$ = nullptr; }
1875	\| '=' initializer
1876	{ $$ = $2; }
1877	\| ATassign initializer
1878	{ $$ = $2->set_maybeConstructed( false ); }
1879	;
1880
1881	initializer:
1882	assignment_expression { $$ = new InitializerNode( $1 ); }
1883	\| '{' initializer_list comma_opt '}' { $$ = new InitializerNode( $2, true ); }
1884	;
1885
1886	initializer_list:
1887	// empty
1888	{ $$ = nullptr; }
1889	\| initializer
1890	\| designation initializer { $$ = $2->set_designators( $1 ); }
1891	\| initializer_list ',' initializer { $$ = (InitializerNode *)( $1->set_last( $3 ) ); }
1892	\| initializer_list ',' designation initializer
1893	{ $$ = (InitializerNode *)( $1->set_last( $4->set_designators( $3 ) ) ); }
1894	;
1895
1896	// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
1897	// '=' to separator the designator from the initializer value, as in:
1898	//
1899	// int x[10] = { [1] = 3 };
1900	//
1901	// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment. To disambiguate this case, CFA
1902	// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
1903	// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
1904	// shift/reduce conflicts
1905
1906	designation:
1907	designator_list ':' // C99, CFA uses ":" instead of "="
1908	\| no_attr_identifier_or_type_name ':' // GCC, field name
1909	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
1910	;
1911
1912	designator_list: // C99
1913	designator
1914	\| designator_list designator
1915	{ $$ = (ExpressionNode *)( $1->set_last( $2 ) ); }
1916	//\| designator_list designator { $$ = new ExpressionNode( $1, $2 ); }
1917	;
1918
1919	designator:
1920	'.' no_attr_identifier_or_type_name // C99, field name
1921	{ $$ = new ExpressionNode( build_varref( $2 ) ); }
1922	\| '[' push assignment_expression pop ']' // C99, single array element
1923	// assignment_expression used instead of constant_expression because of shift/reduce conflicts with tuple.
1924	{ $$ = $3; }
1925	\| '[' push subrange pop ']' // CFA, multiple array elements
1926	{ $$ = $3; }
1927	\| '[' push constant_expression ELLIPSIS constant_expression pop ']' // GCC, multiple array elements
1928	{ $$ = new ExpressionNode( build_range( $3, $5 ) ); }
1929	\| '.' '[' push field_list pop ']' // CFA, tuple field selector
1930	{ $$ = $4; }
1931	;
1932
1933	// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
1934	// rather than an object-oriented type system. This required four groups of extensions:
1935	//
1936	// Overloading: function, data, and operator identifiers may be overloaded.
1937	//
1938	// Type declarations: "type" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
1939	// and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
1940	// definitions of new types. Type declarations with storage class "extern" provide opaque types.
1941	//
1942	// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
1943	// site. A polymorphic function is not a template; it is a function, with an address and a type.
1944	//
1945	// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
1946	// types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
1947	// hierarchies. Unlike classes, they can define relationships between types. Assertions declare that a type or
1948	// types provide the operations declared by a specification. Assertions are normally used to declare requirements
1949	// on type arguments of polymorphic functions.
1950
1951	typegen_declaration_specifier: // CFA
1952	typegen_type_specifier
1953	\| declaration_qualifier_list typegen_type_specifier
1954	{ $$ = $2->addQualifiers( $1 ); }
1955	\| typegen_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1956	{ $$ = $1->addQualifiers( $2 ); }
1957	\| typegen_declaration_specifier storage_class type_qualifier_list
1958	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1959	;
1960
1961	typegen_type_specifier: // CFA
1962	typegen_name
1963	\| type_qualifier_list typegen_name
1964	{ $$ = $2->addQualifiers( $1 ); }
1965	\| typegen_type_specifier type_qualifier
1966	{ $$ = $1->addQualifiers( $2 ); }
1967	;
1968
1969	typegen_name: // CFA
1970	TYPEGENname '(' type_name_list ')'
1971	{ $$ = DeclarationNode::newFromTypeGen( $1, $3 ); }
1972	;
1973
1974	type_parameter_list: // CFA
1975	type_parameter assignment_opt
1976	\| type_parameter_list ',' type_parameter assignment_opt
1977	{ $$ = $1->appendList( $3 ); }
1978	;
1979
1980	type_parameter: // CFA
1981	type_class no_attr_identifier_or_type_name
1982	{ typedefTable.addToEnclosingScope( *$2, TypedefTable::TD ); }
1983	assertion_list_opt
1984	{ $$ = DeclarationNode::newTypeParam( $1, $2 )->addAssertions( $4 ); }
1985	\| type_specifier identifier_parameter_declarator
1986	;
1987
1988	type_class: // CFA
1989	OTYPE
1990	{ $$ = DeclarationNode::Otype; }
1991	\| DTYPE
1992	{ $$ = DeclarationNode::Dtype; }
1993	\| FTYPE
1994	{ $$ = DeclarationNode::Ftype; }
1995	\| TTYPE
1996	{ $$ = DeclarationNode::Ttype; }
1997	;
1998
1999	assertion_list_opt: // CFA
2000	// empty
2001	{ $$ = nullptr; }
2002	\| assertion_list_opt assertion
2003	{ $$ = $1 ? $1->appendList( $2 ) : $2; }
2004	;
2005
2006	assertion: // CFA
2007	'\|' no_attr_identifier_or_type_name '(' type_name_list ')'
2008	{
2009	typedefTable.openTrait( *$2 );
2010	$$ = DeclarationNode::newTraitUse( $2, $4 );
2011	}
2012	\| '\|' '{' push trait_declaration_list '}'
2013	{ $$ = $4; }
2014	\| '\|' '(' push type_parameter_list pop ')' '{' push trait_declaration_list '}' '(' type_name_list ')'
2015	{ $$ = nullptr; }
2016	;
2017
2018	type_name_list: // CFA
2019	type_name
2020	{ $$ = new ExpressionNode( build_typevalue( $1 ) ); }
2021	\| assignment_expression
2022	\| type_name_list ',' type_name
2023	{ $$ = (ExpressionNode *)( $1->set_last( new ExpressionNode( build_typevalue( $3 ) ) ) ); }
2024	\| type_name_list ',' assignment_expression
2025	{ $$ = (ExpressionNode *)( $1->set_last( $3 )); }
2026	;
2027
2028	type_declaring_list: // CFA
2029	OTYPE type_declarator
2030	{ $$ = $2; }
2031	\| storage_class_list OTYPE type_declarator
2032	{ $$ = $3->addQualifiers( $1 ); }
2033	\| type_declaring_list ',' type_declarator
2034	{ $$ = $1->appendList( $3->copyStorageClasses( $1 ) ); }
2035	;
2036
2037	type_declarator: // CFA
2038	type_declarator_name assertion_list_opt
2039	{ $$ = $1->addAssertions( $2 ); }
2040	\| type_declarator_name assertion_list_opt '=' type_name
2041	{ $$ = $1->addAssertions( $2 )->addType( $4 ); }
2042	;
2043
2044	type_declarator_name: // CFA
2045	no_attr_identifier_or_type_name
2046	{
2047	typedefTable.addToEnclosingScope( *$1, TypedefTable::TD );
2048	$$ = DeclarationNode::newTypeDecl( $1, 0 );
2049	}
2050	\| no_01_identifier_or_type_name '(' push type_parameter_list pop ')'
2051	{
2052	typedefTable.addToEnclosingScope( *$1, TypedefTable::TG );
2053	$$ = DeclarationNode::newTypeDecl( $1, $4 );
2054	}
2055	;
2056
2057	trait_specifier: // CFA
2058	TRAIT no_attr_identifier_or_type_name '(' push type_parameter_list pop ')' '{' '}'
2059	{
2060	typedefTable.addToEnclosingScope( *$2, TypedefTable::ID );
2061	$$ = DeclarationNode::newTrait( $2, $5, 0 );
2062	}
2063	\| TRAIT no_attr_identifier_or_type_name '(' push type_parameter_list pop ')' '{'
2064	{
2065	typedefTable.enterTrait( *$2 );
2066	typedefTable.enterScope();
2067	}
2068	trait_declaration_list '}'
2069	{
2070	typedefTable.leaveTrait();
2071	typedefTable.addToEnclosingScope( *$2, TypedefTable::ID );
2072	$$ = DeclarationNode::newTrait( $2, $5, $10 );
2073	}
2074	;
2075
2076	trait_declaration_list: // CFA
2077	trait_declaration
2078	\| trait_declaration_list push trait_declaration
2079	{ $$ = $1->appendList( $3 ); }
2080	;
2081
2082	trait_declaration: // CFA
2083	cfa_trait_declaring_list pop ';'
2084	\| trait_declaring_list pop ';'
2085	;
2086
2087	cfa_trait_declaring_list: // CFA
2088	cfa_variable_specifier
2089	{
2090	typedefTable.addToEnclosingScope2( TypedefTable::ID );
2091	$$ = $1;
2092	}
2093	\| cfa_function_specifier
2094	{
2095	typedefTable.addToEnclosingScope2( TypedefTable::ID );
2096	$$ = $1;
2097	}
2098	\| cfa_trait_declaring_list pop ',' push identifier_or_type_name
2099	{
2100	typedefTable.addToEnclosingScope2( *$5, TypedefTable::ID );
2101	$$ = $1->appendList( $1->cloneType( $5 ) );
2102	}
2103	;
2104
2105	trait_declaring_list: // CFA
2106	type_specifier declarator
2107	{
2108	typedefTable.addToEnclosingScope2( TypedefTable::ID );
2109	$$ = $2->addType( $1 );
2110	}
2111	\| trait_declaring_list pop ',' push declarator
2112	{
2113	typedefTable.addToEnclosingScope2( TypedefTable::ID );
2114	$$ = $1->appendList( $1->cloneBaseType( $5 ) );
2115	}
2116	;
2117
2118	//*************************** EXTERNAL DEFINITIONS ***************************
2119
2120	translation_unit:
2121	// empty
2122	{} // empty input file
2123	\| external_definition_list
2124	{ parseTree = parseTree ? parseTree->appendList( $1 ) : $1; }
2125	;
2126
2127	external_definition_list:
2128	external_definition
2129	\| external_definition_list push external_definition
2130	{ $$ = $1 ? $1->appendList( $3 ) : $3; }
2131	;
2132
2133	external_definition_list_opt:
2134	// empty
2135	{ $$ = nullptr; }
2136	\| external_definition_list
2137	;
2138
2139	external_definition:
2140	declaration
2141	\| external_function_definition
2142	\| ASM '(' string_literal ')' ';' // GCC, global assembler statement
2143	{
2144	$$ = DeclarationNode::newAsmStmt( new StatementNode( build_asmstmt( false, $3, 0 ) ) );
2145	}
2146	\| EXTERN STRINGliteral // C++-style linkage specifier
2147	{
2148	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
2149	linkage = LinkageSpec::linkageCheck( $2 );
2150	}
2151	'{' external_definition_list_opt '}'
2152	{
2153	linkage = linkageStack.top();
2154	linkageStack.pop();
2155	$$ = $5;
2156	}
2157	\| EXTENSION external_definition // GCC, multiple __extension__ allowed, meaning unknown
2158	{
2159	distExt( $2 ); // mark all fields in list
2160	$$ = $2;
2161	}
2162	;
2163
2164	external_function_definition:
2165	function_definition
2166	// These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
2167	// legacy code with global functions missing the type-specifier for the return type, and assuming "int".
2168	// Parsing is possible because function_definition does not appear in the context of an expression (nested
2169	// functions preclude this concession, i.e., all nested function must have a return type). A function prototype
2170	// declaration must still have a type_specifier. OBSOLESCENT (see 1)
2171	\| function_declarator compound_statement
2172	{
2173	typedefTable.addToEnclosingScope( TypedefTable::ID );
2174	typedefTable.leaveScope();
2175	$$ = $1->addFunctionBody( $2 );
2176	}
2177	\| KR_function_declarator push KR_declaration_list_opt compound_statement
2178	{
2179	typedefTable.addToEnclosingScope( TypedefTable::ID );
2180	typedefTable.leaveScope();
2181	$$ = $1->addOldDeclList( $3 )->addFunctionBody( $4 );
2182	}
2183	;
2184
2185	function_definition:
2186	cfa_function_declaration compound_statement // CFA
2187	{
2188	typedefTable.addToEnclosingScope( TypedefTable::ID );
2189	typedefTable.leaveScope();
2190	$$ = $1->addFunctionBody( $2 );
2191	}
2192	\| declaration_specifier function_declarator compound_statement
2193	{
2194	typedefTable.addToEnclosingScope( TypedefTable::ID );
2195	typedefTable.leaveScope();
2196	$$ = $2->addFunctionBody( $3 )->addType( $1 );
2197	}
2198	\| type_qualifier_list function_declarator compound_statement
2199	{
2200	typedefTable.addToEnclosingScope( TypedefTable::ID );
2201	typedefTable.leaveScope();
2202	$$ = $2->addFunctionBody( $3 )->addQualifiers( $1 );
2203	}
2204	\| declaration_qualifier_list function_declarator compound_statement
2205	{
2206	typedefTable.addToEnclosingScope( TypedefTable::ID );
2207	typedefTable.leaveScope();
2208	$$ = $2->addFunctionBody( $3 )->addQualifiers( $1 );
2209	}
2210	\| declaration_qualifier_list type_qualifier_list function_declarator compound_statement
2211	{
2212	typedefTable.addToEnclosingScope( TypedefTable::ID );
2213	typedefTable.leaveScope();
2214	$$ = $3->addFunctionBody( $4 )->addQualifiers( $2 )->addQualifiers( $1 );
2215	}
2216
2217	// Old-style K&R function definition, OBSOLESCENT (see 4)
2218	\| declaration_specifier KR_function_declarator push KR_declaration_list_opt compound_statement
2219	{
2220	typedefTable.addToEnclosingScope( TypedefTable::ID );
2221	typedefTable.leaveScope();
2222	$$ = $2->addOldDeclList( $4 )->addFunctionBody( $5 )->addType( $1 );
2223	}
2224	\| type_qualifier_list KR_function_declarator push KR_declaration_list_opt compound_statement
2225	{
2226	typedefTable.addToEnclosingScope( TypedefTable::ID );
2227	typedefTable.leaveScope();
2228	$$ = $2->addOldDeclList( $4 )->addFunctionBody( $5 )->addQualifiers( $1 );
2229	}
2230
2231	// Old-style K&R function definition with "implicit int" type_specifier, OBSOLESCENT (see 4)
2232	\| declaration_qualifier_list KR_function_declarator push KR_declaration_list_opt compound_statement
2233	{
2234	typedefTable.addToEnclosingScope( TypedefTable::ID );
2235	typedefTable.leaveScope();
2236	$$ = $2->addOldDeclList( $4 )->addFunctionBody( $5 )->addQualifiers( $1 );
2237	}
2238	\| declaration_qualifier_list type_qualifier_list KR_function_declarator push KR_declaration_list_opt compound_statement
2239	{
2240	typedefTable.addToEnclosingScope( TypedefTable::ID );
2241	typedefTable.leaveScope();
2242	$$ = $3->addOldDeclList( $5 )->addFunctionBody( $6 )->addQualifiers( $2 )->addQualifiers( $1 );
2243	}
2244	;
2245
2246	declarator:
2247	variable_declarator
2248	\| variable_type_redeclarator
2249	\| function_declarator
2250	;
2251
2252	subrange:
2253	constant_expression '~' constant_expression // CFA, integer subrange
2254	{ $$ = new ExpressionNode( build_range( $1, $3 ) ); }
2255	;
2256
2257	asm_name_opt: // GCC
2258	// empty
2259	{ $$ = nullptr; }
2260	\| ASM '(' string_literal ')' attribute_list_opt
2261	{
2262	DeclarationNode * name = new DeclarationNode();
2263	name->asmName = $3;
2264	$$ = name->addQualifiers( $5 );
2265	}
2266	;
2267
2268	attribute_list_opt: // GCC
2269	// empty
2270	{ $$ = nullptr; }
2271	\| attribute_list
2272	;
2273
2274	attribute_list: // GCC
2275	attribute
2276	\| attribute_list attribute
2277	{ $$ = $2->addQualifiers( $1 ); }
2278	;
2279
2280	attribute: // GCC
2281	ATTRIBUTE '(' '(' attribute_name_list ')' ')'
2282	{ $$ = $4; }
2283	;
2284
2285	attribute_name_list: // GCC
2286	attribute_name
2287	\| attribute_name_list ',' attribute_name
2288	{ $$ = $3->addQualifiers( $1 ); }
2289	;
2290
2291	attribute_name: // GCC
2292	// empty
2293	{ $$ = nullptr; }
2294	\| attr_name
2295	{ $$ = DeclarationNode::newAttribute( $1 ); }
2296	\| attr_name '(' argument_expression_list ')'
2297	{ $$ = DeclarationNode::newAttribute( $1, $3 ); }
2298	;
2299
2300	attr_name: // GCC
2301	IDENTIFIER
2302	\| TYPEDEFname
2303	\| TYPEGENname
2304	\| CONST
2305	{ $$ = Token{ new string( "__const__" ) }; }
2306	;
2307
2308	// ============================================================================
2309	// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
2310	// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
2311	// in:
2312	//
2313	// int (*f())[10] { ... };
2314	// ... (*f())[3] += 1; // definition mimics usage
2315	//
2316	// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
2317	// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
2318	// ============================================================================
2319
2320	// ----------------------------------------------------------------------------
2321	// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
2322	// to define a variable or function prototype, e.g.:
2323	//
2324	// valid declaration invalid definition
2325	// ----------------- ------------------
2326	// int f; int f {}
2327	// int f; int f {}
2328	// int f[10]; int f[10] {}
2329	// int (f)(int); int (f)(int) {}
2330	//
2331	// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
2332	// variable_declarator and function_declarator.
2333	// ----------------------------------------------------------------------------
2334
2335	// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
2336	// declaring an array of functions versus a pointer to an array of functions.
2337
2338	variable_declarator:
2339	paren_identifier attribute_list_opt
2340	{ $$ = $1->addQualifiers( $2 ); }
2341	\| variable_ptr
2342	\| variable_array attribute_list_opt
2343	{ $$ = $1->addQualifiers( $2 ); }
2344	\| variable_function attribute_list_opt
2345	{ $$ = $1->addQualifiers( $2 ); }
2346	;
2347
2348	paren_identifier:
2349	identifier
2350	{
2351	typedefTable.setNextIdentifier( *$1 );
2352	$$ = DeclarationNode::newName( $1 );
2353	}
2354	\| '(' paren_identifier ')' // redundant parenthesis
2355	{ $$ = $2; }
2356	;
2357
2358	variable_ptr:
2359	ptrref_operator variable_declarator
2360	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2361	\| ptrref_operator type_qualifier_list variable_declarator
2362	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2363	\| '(' variable_ptr ')' attribute_list_opt
2364	{ $$ = $2->addQualifiers( $4 ); } // redundant parenthesis
2365	;
2366
2367	variable_array:
2368	paren_identifier array_dimension
2369	{ $$ = $1->addArray( $2 ); }
2370	\| '(' variable_ptr ')' array_dimension
2371	{ $$ = $2->addArray( $4 ); }
2372	\| '(' variable_array ')' multi_array_dimension // redundant parenthesis
2373	{ $$ = $2->addArray( $4 ); }
2374	\| '(' variable_array ')' // redundant parenthesis
2375	{ $$ = $2; }
2376	;
2377
2378	variable_function:
2379	'(' variable_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2380	{ $$ = $2->addParamList( $6 ); }
2381	\| '(' variable_function ')' // redundant parenthesis
2382	{ $$ = $2; }
2383	;
2384
2385	// This pattern parses a function declarator that is not redefining a typedef name. For non-nested functions, there is
2386	// no context where a function definition can redefine a typedef name, i.e., the typedef and function name cannot exist
2387	// is the same scope. The pattern precludes returning arrays and functions versus pointers to arrays and functions.
2388
2389	function_declarator:
2390	function_no_ptr attribute_list_opt
2391	{ $$ = $1->addQualifiers( $2 ); }
2392	\| function_ptr
2393	\| function_array attribute_list_opt
2394	{ $$ = $1->addQualifiers( $2 ); }
2395	;
2396
2397	function_no_ptr:
2398	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2399	{ $$ = $1->addParamList( $4 ); }
2400	\| '(' function_ptr ')' '(' push parameter_type_list_opt pop ')'
2401	{ $$ = $2->addParamList( $6 ); }
2402	\| '(' function_no_ptr ')' // redundant parenthesis
2403	{ $$ = $2; }
2404	;
2405
2406	function_ptr:
2407	ptrref_operator function_declarator
2408	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2409	\| ptrref_operator type_qualifier_list function_declarator
2410	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2411	\| '(' function_ptr ')'
2412	{ $$ = $2; }
2413	;
2414
2415	function_array:
2416	'(' function_ptr ')' array_dimension
2417	{ $$ = $2->addArray( $4 ); }
2418	\| '(' function_array ')' multi_array_dimension // redundant parenthesis
2419	{ $$ = $2->addArray( $4 ); }
2420	\| '(' function_array ')' // redundant parenthesis
2421	{ $$ = $2; }
2422	;
2423
2424	// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4)
2425	//
2426	// f( a, b, c ) int a, *b, c[]; {}
2427	//
2428	// that is not redefining a typedef name (see function_declarator for additional comments). The pattern precludes
2429	// returning arrays and functions versus pointers to arrays and functions.
2430
2431	KR_function_declarator:
2432	KR_function_no_ptr
2433	\| KR_function_ptr
2434	\| KR_function_array
2435	;
2436
2437	KR_function_no_ptr:
2438	paren_identifier '(' identifier_list ')' // function_declarator handles empty parameter
2439	{ $$ = $1->addIdList( $3 ); }
2440	\| '(' KR_function_ptr ')' '(' push parameter_type_list_opt pop ')'
2441	{ $$ = $2->addParamList( $6 ); }
2442	\| '(' KR_function_no_ptr ')' // redundant parenthesis
2443	{ $$ = $2; }
2444	;
2445
2446	KR_function_ptr:
2447	ptrref_operator KR_function_declarator
2448	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2449	\| ptrref_operator type_qualifier_list KR_function_declarator
2450	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2451	\| '(' KR_function_ptr ')'
2452	{ $$ = $2; }
2453	;
2454
2455	KR_function_array:
2456	'(' KR_function_ptr ')' array_dimension
2457	{ $$ = $2->addArray( $4 ); }
2458	\| '(' KR_function_array ')' multi_array_dimension // redundant parenthesis
2459	{ $$ = $2->addArray( $4 ); }
2460	\| '(' KR_function_array ')' // redundant parenthesis
2461	{ $$ = $2; }
2462	;
2463
2464	// This pattern parses a declaration for a variable or function prototype that redefines a type name, e.g.:
2465	//
2466	// typedef int foo;
2467	// {
2468	// int foo; // redefine typedef name in new scope
2469	// }
2470	//
2471	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
2472	// and functions versus pointers to arrays and functions.
2473
2474	variable_type_redeclarator:
2475	paren_type attribute_list_opt
2476	{ $$ = $1->addQualifiers( $2 ); }
2477	\| type_ptr
2478	\| type_array attribute_list_opt
2479	{ $$ = $1->addQualifiers( $2 ); }
2480	\| type_function attribute_list_opt
2481	{ $$ = $1->addQualifiers( $2 ); }
2482	;
2483
2484	paren_type:
2485	typedef
2486	\| '(' paren_type ')'
2487	{ $$ = $2; }
2488	;
2489
2490	type_ptr:
2491	ptrref_operator variable_type_redeclarator
2492	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2493	\| ptrref_operator type_qualifier_list variable_type_redeclarator
2494	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2495	\| '(' type_ptr ')' attribute_list_opt
2496	{ $$ = $2->addQualifiers( $4 ); }
2497	;
2498
2499	type_array:
2500	paren_type array_dimension
2501	{ $$ = $1->addArray( $2 ); }
2502	\| '(' type_ptr ')' array_dimension
2503	{ $$ = $2->addArray( $4 ); }
2504	\| '(' type_array ')' multi_array_dimension // redundant parenthesis
2505	{ $$ = $2->addArray( $4 ); }
2506	\| '(' type_array ')' // redundant parenthesis
2507	{ $$ = $2; }
2508	;
2509
2510	type_function:
2511	paren_type '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2512	{ $$ = $1->addParamList( $4 ); }
2513	\| '(' type_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2514	{ $$ = $2->addParamList( $6 ); }
2515	\| '(' type_function ')' // redundant parenthesis
2516	{ $$ = $2; }
2517	;
2518
2519	// This pattern parses a declaration for a parameter variable of a function prototype or actual that is not redefining a
2520	// typedef name and allows the C99 array options, which can only appear in a parameter list. The pattern precludes
2521	// declaring an array of functions versus a pointer to an array of functions, and returning arrays and functions versus
2522	// pointers to arrays and functions.
2523
2524	identifier_parameter_declarator:
2525	paren_identifier attribute_list_opt
2526	{ $$ = $1->addQualifiers( $2 ); }
2527	\| identifier_parameter_ptr
2528	\| identifier_parameter_array attribute_list_opt
2529	{ $$ = $1->addQualifiers( $2 ); }
2530	\| identifier_parameter_function attribute_list_opt
2531	{ $$ = $1->addQualifiers( $2 ); }
2532	;
2533
2534	identifier_parameter_ptr:
2535	ptrref_operator identifier_parameter_declarator
2536	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2537	\| ptrref_operator type_qualifier_list identifier_parameter_declarator
2538	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2539	\| '(' identifier_parameter_ptr ')' attribute_list_opt
2540	{ $$ = $2->addQualifiers( $4 ); }
2541	;
2542
2543	identifier_parameter_array:
2544	paren_identifier array_parameter_dimension
2545	{ $$ = $1->addArray( $2 ); }
2546	\| '(' identifier_parameter_ptr ')' array_dimension
2547	{ $$ = $2->addArray( $4 ); }
2548	\| '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
2549	{ $$ = $2->addArray( $4 ); }
2550	\| '(' identifier_parameter_array ')' // redundant parenthesis
2551	{ $$ = $2; }
2552	;
2553
2554	identifier_parameter_function:
2555	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2556	{ $$ = $1->addParamList( $4 ); }
2557	\| '(' identifier_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2558	{ $$ = $2->addParamList( $6 ); }
2559	\| '(' identifier_parameter_function ')' // redundant parenthesis
2560	{ $$ = $2; }
2561	;
2562
2563	// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
2564	// e.g.:
2565	//
2566	// typedef int foo;
2567	// int f( int foo ); // redefine typedef name in new scope
2568	//
2569	// and allows the C99 array options, which can only appear in a parameter list.
2570
2571	type_parameter_redeclarator:
2572	typedef attribute_list_opt
2573	{ $$ = $1->addQualifiers( $2 ); }
2574	\| type_parameter_ptr
2575	\| type_parameter_array attribute_list_opt
2576	{ $$ = $1->addQualifiers( $2 ); }
2577	\| type_parameter_function attribute_list_opt
2578	{ $$ = $1->addQualifiers( $2 ); }
2579	;
2580
2581	typedef:
2582	TYPEDEFname
2583	{
2584	typedefTable.setNextIdentifier( *$1 );
2585	$$ = DeclarationNode::newName( $1 );
2586	}
2587	\| TYPEGENname
2588	{
2589	typedefTable.setNextIdentifier( *$1 );
2590	$$ = DeclarationNode::newName( $1 );
2591	}
2592	;
2593
2594	type_parameter_ptr:
2595	ptrref_operator type_parameter_redeclarator
2596	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2597	\| ptrref_operator type_qualifier_list type_parameter_redeclarator
2598	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2599	\| '(' type_parameter_ptr ')' attribute_list_opt
2600	{ $$ = $2->addQualifiers( $4 ); }
2601	;
2602
2603	type_parameter_array:
2604	typedef array_parameter_dimension
2605	{ $$ = $1->addArray( $2 ); }
2606	\| '(' type_parameter_ptr ')' array_parameter_dimension
2607	{ $$ = $2->addArray( $4 ); }
2608	;
2609
2610	type_parameter_function:
2611	typedef '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2612	{ $$ = $1->addParamList( $4 ); }
2613	\| '(' type_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2614	{ $$ = $2->addParamList( $6 ); }
2615	;
2616
2617	// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
2618	// which the type applies, e.g.:
2619	//
2620	// sizeof( int );
2621	// sizeof( int * );
2622	// sizeof( int [10] );
2623	// sizeof( int (*)() );
2624	// sizeof( int () );
2625	//
2626	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
2627	// and functions versus pointers to arrays and functions.
2628
2629	abstract_declarator:
2630	abstract_ptr
2631	\| abstract_array attribute_list_opt
2632	{ $$ = $1->addQualifiers( $2 ); }
2633	\| abstract_function attribute_list_opt
2634	{ $$ = $1->addQualifiers( $2 ); }
2635	;
2636
2637	abstract_ptr:
2638	ptrref_operator
2639	{ $$ = DeclarationNode::newPointer( 0 ); }
2640	\| ptrref_operator type_qualifier_list
2641	{ $$ = DeclarationNode::newPointer( $2 ); }
2642	\| ptrref_operator abstract_declarator
2643	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2644	\| ptrref_operator type_qualifier_list abstract_declarator
2645	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2646	\| '(' abstract_ptr ')' attribute_list_opt
2647	{ $$ = $2->addQualifiers( $4 ); }
2648	;
2649
2650	abstract_array:
2651	array_dimension
2652	\| '(' abstract_ptr ')' array_dimension
2653	{ $$ = $2->addArray( $4 ); }
2654	\| '(' abstract_array ')' multi_array_dimension // redundant parenthesis
2655	{ $$ = $2->addArray( $4 ); }
2656	\| '(' abstract_array ')' // redundant parenthesis
2657	{ $$ = $2; }
2658	;
2659
2660	abstract_function:
2661	'(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2662	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $3, nullptr ); }
2663	\| '(' abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2664	{ $$ = $2->addParamList( $6 ); }
2665	\| '(' abstract_function ')' // redundant parenthesis
2666	{ $$ = $2; }
2667	;
2668
2669	array_dimension:
2670	// Only the first dimension can be empty.
2671	'[' ']'
2672	{ $$ = DeclarationNode::newArray( 0, 0, false ); }
2673	\| '[' ']' multi_array_dimension
2674	{ $$ = DeclarationNode::newArray( 0, 0, false )->addArray( $3 ); }
2675	\| multi_array_dimension
2676	;
2677
2678	multi_array_dimension:
2679	'[' push assignment_expression pop ']'
2680	{ $$ = DeclarationNode::newArray( $3, 0, false ); }
2681	\| '[' push '*' pop ']' // C99
2682	{ $$ = DeclarationNode::newVarArray( 0 ); }
2683	\| multi_array_dimension '[' push assignment_expression pop ']'
2684	{ $$ = $1->addArray( DeclarationNode::newArray( $4, 0, false ) ); }
2685	\| multi_array_dimension '[' push '*' pop ']' // C99
2686	{ $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
2687	;
2688
2689	// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
2690	// identifier to which the type applies, e.g.:
2691	//
2692	// int f( int ); // not handled here
2693	// int f( int * ); // abstract function-prototype parameter; no parameter name specified
2694	// int f( int (*)() ); // abstract function-prototype parameter; no parameter name specified
2695	// int f( int (int) ); // abstract function-prototype parameter; no parameter name specified
2696	//
2697	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
2698	// and functions versus pointers to arrays and functions. In addition, the pattern handles the
2699	// special meaning of parenthesis around a typedef name:
2700	//
2701	// ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
2702	// parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
2703	// not as redundant parentheses around the identifier."
2704	//
2705	// For example:
2706	//
2707	// typedef float T;
2708	// int f( int ( T [5] ) ); // see abstract_parameter_declarator
2709	// int g( int ( T ( int ) ) ); // see abstract_parameter_declarator
2710	// int f( int f1( T a[5] ) ); // see identifier_parameter_declarator
2711	// int g( int g1( T g2( int p ) ) ); // see identifier_parameter_declarator
2712	//
2713	// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
2714	// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
2715	// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
2716	// functions.
2717
2718	abstract_parameter_declarator:
2719	abstract_parameter_ptr
2720	\| abstract_parameter_array attribute_list_opt
2721	{ $$ = $1->addQualifiers( $2 ); }
2722	\| abstract_parameter_function attribute_list_opt
2723	{ $$ = $1->addQualifiers( $2 ); }
2724	;
2725
2726	abstract_parameter_ptr:
2727	ptrref_operator
2728	{ $$ = DeclarationNode::newPointer( nullptr ); }
2729	\| ptrref_operator type_qualifier_list
2730	{ $$ = DeclarationNode::newPointer( $2 ); }
2731	\| ptrref_operator abstract_parameter_declarator
2732	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr ) ); }
2733	\| ptrref_operator type_qualifier_list abstract_parameter_declarator
2734	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2735	\| '(' abstract_parameter_ptr ')' attribute_list_opt
2736	{ $$ = $2->addQualifiers( $4 ); }
2737	;
2738
2739	abstract_parameter_array:
2740	array_parameter_dimension
2741	\| '(' abstract_parameter_ptr ')' array_parameter_dimension
2742	{ $$ = $2->addArray( $4 ); }
2743	\| '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
2744	{ $$ = $2->addArray( $4 ); }
2745	\| '(' abstract_parameter_array ')' // redundant parenthesis
2746	{ $$ = $2; }
2747	;
2748
2749	abstract_parameter_function:
2750	'(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2751	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $3, nullptr ); }
2752	\| '(' abstract_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2753	{ $$ = $2->addParamList( $6 ); }
2754	\| '(' abstract_parameter_function ')' // redundant parenthesis
2755	{ $$ = $2; }
2756	;
2757
2758	array_parameter_dimension:
2759	// Only the first dimension can be empty or have qualifiers.
2760	array_parameter_1st_dimension
2761	\| array_parameter_1st_dimension multi_array_dimension
2762	{ $$ = $1->addArray( $2 ); }
2763	\| multi_array_dimension
2764	;
2765
2766	// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
2767	//
2768	// ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
2769	// a declaration of a function parameter with an array type, and then only in the outermost array type derivation."
2770
2771	array_parameter_1st_dimension:
2772	'[' ']'
2773	{ $$ = DeclarationNode::newArray( 0, 0, false ); }
2774	// multi_array_dimension handles the '[' '*' ']' case
2775	\| '[' push type_qualifier_list '*' pop ']' // remaining C99
2776	{ $$ = DeclarationNode::newVarArray( $3 ); }
2777	\| '[' push type_qualifier_list pop ']'
2778	{ $$ = DeclarationNode::newArray( 0, $3, false ); }
2779	// multi_array_dimension handles the '[' assignment_expression ']' case
2780	\| '[' push type_qualifier_list assignment_expression pop ']'
2781	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
2782	\| '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
2783	{ $$ = DeclarationNode::newArray( $5, $4, true ); }
2784	\| '[' push type_qualifier_list STATIC assignment_expression pop ']'
2785	{ $$ = DeclarationNode::newArray( $5, $3, true ); }
2786	;
2787
2788	// This pattern parses a declaration of an abstract variable, but does not allow "int ()" for a function pointer.
2789	//
2790	// struct S {
2791	// int;
2792	// int *;
2793	// int [10];
2794	// int (*)();
2795	// };
2796
2797	variable_abstract_declarator:
2798	variable_abstract_ptr
2799	\| variable_abstract_array attribute_list_opt
2800	{ $$ = $1->addQualifiers( $2 ); }
2801	\| variable_abstract_function attribute_list_opt
2802	{ $$ = $1->addQualifiers( $2 ); }
2803	;
2804
2805	variable_abstract_ptr:
2806	ptrref_operator
2807	{ $$ = DeclarationNode::newPointer( 0 ); }
2808	\| ptrref_operator type_qualifier_list
2809	{ $$ = DeclarationNode::newPointer( $2 ); }
2810	\| ptrref_operator variable_abstract_declarator
2811	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0 ) ); }
2812	\| ptrref_operator type_qualifier_list variable_abstract_declarator
2813	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2 ) ); }
2814	\| '(' variable_abstract_ptr ')' attribute_list_opt
2815	{ $$ = $2->addQualifiers( $4 ); }
2816	;
2817
2818	variable_abstract_array:
2819	array_dimension
2820	\| '(' variable_abstract_ptr ')' array_dimension
2821	{ $$ = $2->addArray( $4 ); }
2822	\| '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
2823	{ $$ = $2->addArray( $4 ); }
2824	\| '(' variable_abstract_array ')' // redundant parenthesis
2825	{ $$ = $2; }
2826	;
2827
2828	variable_abstract_function:
2829	'(' variable_abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2830	{ $$ = $2->addParamList( $6 ); }
2831	\| '(' variable_abstract_function ')' // redundant parenthesis
2832	{ $$ = $2; }
2833	;
2834
2835	// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
2836	// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.
2837
2838	cfa_identifier_parameter_declarator_tuple: // CFA
2839	cfa_identifier_parameter_declarator_no_tuple
2840	\| cfa_abstract_tuple
2841	\| type_qualifier_list cfa_abstract_tuple
2842	{ $$ = $2->addQualifiers( $1 ); }
2843	;
2844
2845	cfa_identifier_parameter_declarator_no_tuple: // CFA
2846	cfa_identifier_parameter_ptr
2847	\| cfa_identifier_parameter_array
2848	;
2849
2850	cfa_identifier_parameter_ptr: // CFA
2851	// No SUE declaration in parameter list.
2852	ptrref_operator type_specifier_nobody
2853	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
2854	\| type_qualifier_list ptrref_operator type_specifier_nobody
2855	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
2856	\| ptrref_operator cfa_abstract_function
2857	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
2858	\| type_qualifier_list ptrref_operator cfa_abstract_function
2859	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
2860	\| ptrref_operator cfa_identifier_parameter_declarator_tuple
2861	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
2862	\| type_qualifier_list ptrref_operator cfa_identifier_parameter_declarator_tuple
2863	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
2864	;
2865
2866	cfa_identifier_parameter_array: // CFA
2867	// Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
2868	// shift/reduce conflict with new-style empty (void) function return type.
2869	'[' ']' type_specifier_nobody
2870	{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
2871	\| cfa_array_parameter_1st_dimension type_specifier_nobody
2872	{ $$ = $2->addNewArray( $1 ); }
2873	\| '[' ']' multi_array_dimension type_specifier_nobody
2874	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
2875	\| cfa_array_parameter_1st_dimension multi_array_dimension type_specifier_nobody
2876	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
2877	\| multi_array_dimension type_specifier_nobody
2878	{ $$ = $2->addNewArray( $1 ); }
2879
2880	\| '[' ']' cfa_identifier_parameter_ptr
2881	{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
2882	\| cfa_array_parameter_1st_dimension cfa_identifier_parameter_ptr
2883	{ $$ = $2->addNewArray( $1 ); }
2884	\| '[' ']' multi_array_dimension cfa_identifier_parameter_ptr
2885	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
2886	\| cfa_array_parameter_1st_dimension multi_array_dimension cfa_identifier_parameter_ptr
2887	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
2888	\| multi_array_dimension cfa_identifier_parameter_ptr
2889	{ $$ = $2->addNewArray( $1 ); }
2890	;
2891
2892	cfa_array_parameter_1st_dimension:
2893	'[' push type_qualifier_list '*' pop ']' // remaining C99
2894	{ $$ = DeclarationNode::newVarArray( $3 ); }
2895	\| '[' push type_qualifier_list assignment_expression pop ']'
2896	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
2897	\| '[' push declaration_qualifier_list assignment_expression pop ']'
2898	// declaration_qualifier_list must be used because of shift/reduce conflict with
2899	// assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
2900	// appear in this context.
2901	{ $$ = DeclarationNode::newArray( $4, $3, true ); }
2902	\| '[' push declaration_qualifier_list type_qualifier_list assignment_expression pop ']'
2903	{ $$ = DeclarationNode::newArray( $5, $4->addQualifiers( $3 ), true ); }
2904	;
2905
2906	// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
2907	// identifier to which the type applies, e.g.:
2908	//
2909	// [int] f( int ); // abstract variable parameter; no parameter name specified
2910	// [int] f( [int] (int) ); // abstract function-prototype parameter; no parameter name specified
2911	//
2912	// These rules need LR(3):
2913	//
2914	// cfa_abstract_tuple identifier_or_type_name
2915	// '[' cfa_parameter_list ']' identifier_or_type_name '(' cfa_parameter_type_list_opt ')'
2916	//
2917	// since a function return type can be syntactically identical to a tuple type:
2918	//
2919	// [int, int] t;
2920	// [int, int] f( int );
2921	//
2922	// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
2923	// cfa_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
2924	// lookahead. To accomplish this, cfa_abstract_declarator has an entry point without tuple, and tuple declarations are
2925	// duplicated when appearing with cfa_function_specifier.
2926
2927	cfa_abstract_declarator_tuple: // CFA
2928	cfa_abstract_tuple
2929	\| type_qualifier_list cfa_abstract_tuple
2930	{ $$ = $2->addQualifiers( $1 ); }
2931	\| cfa_abstract_declarator_no_tuple
2932	;
2933
2934	cfa_abstract_declarator_no_tuple: // CFA
2935	cfa_abstract_ptr
2936	\| cfa_abstract_array
2937	;
2938
2939	cfa_abstract_ptr: // CFA
2940	ptrref_operator type_specifier
2941	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
2942	\| type_qualifier_list ptrref_operator type_specifier
2943	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
2944	\| ptrref_operator cfa_abstract_function
2945	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
2946	\| type_qualifier_list ptrref_operator cfa_abstract_function
2947	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
2948	\| ptrref_operator cfa_abstract_declarator_tuple
2949	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0 ) ); }
2950	\| type_qualifier_list ptrref_operator cfa_abstract_declarator_tuple
2951	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1 ) ); }
2952	;
2953
2954	cfa_abstract_array: // CFA
2955	// Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
2956	// empty (void) function return type.
2957	'[' ']' type_specifier
2958	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
2959	\| '[' ']' multi_array_dimension type_specifier
2960	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
2961	\| multi_array_dimension type_specifier
2962	{ $$ = $2->addNewArray( $1 ); }
2963	\| '[' ']' cfa_abstract_ptr
2964	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
2965	\| '[' ']' multi_array_dimension cfa_abstract_ptr
2966	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
2967	\| multi_array_dimension cfa_abstract_ptr
2968	{ $$ = $2->addNewArray( $1 ); }
2969	;
2970
2971	cfa_abstract_tuple: // CFA
2972	'[' push cfa_abstract_parameter_list pop ']'
2973	{ $$ = DeclarationNode::newTuple( $3 ); }
2974	;
2975
2976	cfa_abstract_function: // CFA
2977	// '[' ']' '(' cfa_parameter_type_list_opt ')'
2978	// { $$ = DeclarationNode::newFunction( nullptr, DeclarationNode::newTuple( nullptr ), $4, nullptr ); }
2979	cfa_abstract_tuple '(' push cfa_parameter_type_list_opt pop ')'
2980	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
2981	\| cfa_function_return '(' push cfa_parameter_type_list_opt pop ')'
2982	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
2983	;
2984
2985	// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
2986	// each declaration, and in the specifier-qualifier list in each structure declaration and type name."
2987	//
2988	// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
2989	// the declaration specifiers in a declaration is an obsolescent feature."
2990	//
2991	// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
2992	// prototype-format parameter type declarators) is an obsolescent feature."
2993	//
2994	// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
2995	// declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.
2996
2997	//*********************** MISCELLANEOUS ******************************
2998
2999	comma_opt: // redundant comma
3000	// empty
3001	\| ','
3002	;
3003
3004	assignment_opt:
3005	// empty
3006	{ $$ = nullptr; }
3007	\| '=' assignment_expression
3008	{ $$ = $2; }
3009	;
3010
3011	%%
3012	// ----end of grammar----
3013
3014	extern char *yytext;
3015
3016	void yyerror( const char * ) {
3017	cout << "Error ";
3018	if ( yyfilename ) {
3019	cout << "in file " << yyfilename << " ";
3020	} // if
3021	cout << "at line " << yylineno << " reading token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << "\"" << endl;
3022	}
3023
3024	// Local Variables: //
3025	// mode: c++ //
3026	// tab-width: 4 //
3027	// compile-command: "make install" //
3028	// End: //

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