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parser.yy @ 9f5bb817

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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	// parser.yy --
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 : Thu Nov 8 18:08:23 2018
13	// Update Count : 4052
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	#define YYERROR_VERBOSE // more information in syntax errors
46
47	#undef __GNUC_MINOR__
48
49	#include <cstdio>
50	#include <stack>
51	using namespace std;
52
53	#include "ParseNode.h"
54	#include "TypedefTable.h"
55	#include "TypeData.h"
56	#include "LinkageSpec.h"
57	#include "Common/SemanticError.h" // error_str
58	#include "Common/utility.h" // for maybeMoveBuild, maybeBuild, CodeLo...
59
60	extern DeclarationNode * parseTree;
61	extern LinkageSpec::Spec linkage;
62	extern TypedefTable typedefTable;
63
64	stack< LinkageSpec::Spec > linkageStack;
65
66	bool appendStr( string & to, string & from ) {
67	// 1. Multiple strings are concatenated into a single string but not combined internally. The reason is that
68	// "\x12" "3" is treated as 2 characters versus 1 because "escape sequences are converted into single members of
69	// the execution character set just prior to adjacent string literal concatenation" (C11, Section 6.4.5-8). It is
70	// easier to let the C compiler handle this case.
71	//
72	// 2. String encodings are transformed into canonical form (one encoding at start) so the encoding can be found
73	// without searching the string, e.g.: "abc" L"def" L"ghi" => L"abc" "def" "ghi". Multiple encodings must match,
74	// i.e., u"a" U"b" L"c" is disallowed.
75
76	if ( from[0] != '"' ) { // encoding ?
77	if ( to[0] != '"' ) { // encoding ?
78	if ( to[0] != from[0] \|\| to[1] != from[1] ) { // different encodings ?
79	yyerror( "non-matching string encodings for string-literal concatenation" );
80	return false; // parse error, must call YYERROR in action
81	} else if ( from[1] == '8' ) {
82	from.erase( 0, 1 ); // remove 2nd encoding
83	} // if
84	} else {
85	if ( from[1] == '8' ) { // move encoding to start
86	to = "u8" + to;
87	from.erase( 0, 1 ); // remove 2nd encoding
88	} else {
89	to = from[0] + to;
90	} // if
91	} // if
92	from.erase( 0, 1 ); // remove 2nd encoding
93	} // if
94	to += " " + from; // concatenated into single string
95	return true;
96	} // appendStr
97
98	DeclarationNode * distAttr( DeclarationNode * specifier, DeclarationNode * declList ) {
99	// distribute declaration_specifier across all declared variables, e.g., static, const, __attribute__.
100	DeclarationNode * cur = declList, * cl = (new DeclarationNode)->addType( specifier );
101	//cur->addType( specifier );
102	for ( cur = dynamic_cast< DeclarationNode * >( cur->get_next() ); cur != nullptr; cur = dynamic_cast< DeclarationNode * >( cur->get_next() ) ) {
103	cl->cloneBaseType( cur );
104	} // for
105	declList->addType( cl );
106	// delete cl;
107	return declList;
108	} // distAttr
109
110	void distExt( DeclarationNode * declaration ) {
111	// distribute EXTENSION across all declarations
112	for ( DeclarationNode iter = declaration; iter != nullptr; iter = (DeclarationNode )iter->get_next() ) {
113	iter->set_extension( true );
114	} // for
115	} // distExt
116
117	void distInl( DeclarationNode * declaration ) {
118	// distribute EXTENSION across all declarations
119	for ( DeclarationNode iter = declaration; iter != nullptr; iter = (DeclarationNode )iter->get_next() ) {
120	iter->set_inLine( true );
121	} // for
122	} // distInl
123
124	void distQual( DeclarationNode * declaration, DeclarationNode * qualifiers ) {
125	// distribute qualifiers across all non-variable declarations in a distribution statemement
126	for ( DeclarationNode * iter = declaration; iter != nullptr; iter = (DeclarationNode *)iter->get_next() ) {
127	// SKULLDUGGERY: Distributions are parsed inside out, so qualifiers are added to declarations inside out. Since
128	// addQualifiers appends to the back of the list, the forall clauses are in the wrong order (right to left). To
129	// get the qualifiers in the correct order and still use addQualifiers (otherwise, 90% of addQualifiers has to
130	// be copied to add to front), the appropriate forall pointers are interchanged before calling addQualifiers.
131	DeclarationNode * clone = qualifiers->clone();
132	if ( qualifiers->type ) { // forall clause ? (handles SC)
133	if ( iter->type->kind == TypeData::Aggregate ) { // struct/union ?
134	swap( clone->type->forall, iter->type->aggregate.params );
135	iter->addQualifiers( clone );
136	} else if ( iter->type->kind == TypeData::AggregateInst && iter->type->aggInst.aggregate->aggregate.body ) { // struct/union ?
137	// Create temporary node to hold aggregate, call addQualifiers as above, then put nodes back together.
138	DeclarationNode newnode;
139	swap( newnode.type, iter->type->aggInst.aggregate );
140	swap( clone->type->forall, newnode.type->aggregate.params );
141	newnode.addQualifiers( clone );
142	swap( newnode.type, iter->type->aggInst.aggregate );
143	} else if ( iter->type->kind == TypeData::Function ) { // routines ?
144	swap( clone->type->forall, iter->type->forall );
145	iter->addQualifiers( clone );
146	} // if
147	} else { // just SC qualifiers
148	iter->addQualifiers( clone );
149	} // if
150	} // for
151	delete qualifiers;
152	} // distQual
153
154	// There is an ambiguity for inline generic-routine return-types and generic routines.
155	// forall( otype T ) struct S { int i; } bar( T ) {}
156	// Does the forall bind to the struct or the routine, and how would it be possible to explicitly specify the binding.
157	// forall( otype T ) struct S { int T; } forall( otype W ) bar( W ) {}
158	// Currently, the forall is associated with the routine, and the generic type has to be separately defined:
159	// forall( otype T ) struct S { int T; };
160	// forall( otype W ) bar( W ) {}
161
162	void rebindForall( DeclarationNode * declSpec, DeclarationNode * funcDecl ) {
163	if ( declSpec->type->kind == TypeData::Aggregate ) { // ignore aggregate definition
164	funcDecl->type->forall = declSpec->type->aggregate.params; // move forall from aggregate to function type
165	declSpec->type->aggregate.params = nullptr;
166	} // if
167	} // rebindForall
168
169	NameExpr * build_postfix_name( const string * name ) {
170	NameExpr * new_name = build_varref( new string( "?`" + *name ) );
171	delete name;
172	return new_name;
173	} // build_postfix_name
174
175	DeclarationNode * fieldDecl( DeclarationNode * typeSpec, DeclarationNode * fieldList ) {
176	if ( ! fieldList ) { // field declarator ?
177	if ( ! ( typeSpec->type && typeSpec->type->kind == TypeData::Aggregate ) ) {
178	stringstream ss;
179	typeSpec->type->print( ss );
180	SemanticWarning( yylloc, Warning::SuperfluousDecl, ss.str().c_str() );
181	return nullptr;
182	} // if
183	fieldList = DeclarationNode::newName( nullptr );
184	} // if
185	return distAttr( typeSpec, fieldList ); // mark all fields in list
186	} // fieldDecl
187
188	ForCtrl * forCtrl( ExpressionNode * type, string * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
189	ConstantExpr * constant = dynamic_cast<ConstantExpr *>(type->get_expr());
190	if ( constant && (constant->get_constant()->get_value() == "0" \|\| constant->get_constant()->get_value() == "1") ) {
191	type = new ExpressionNode( new CastExpr( maybeMoveBuild< Expression >(type), new BasicType( Type::Qualifiers(), BasicType::SignedInt ) ) );
192	} // if
193	return new ForCtrl(
194	distAttr( DeclarationNode::newTypeof( type, true ), DeclarationNode::newName( index )->addInitializer( new InitializerNode( start ) ) ),
195	new ExpressionNode( build_binary_val( compop, new ExpressionNode( build_varref( new string( *index ) ) ), comp ) ),
196	new ExpressionNode( build_binary_val( compop == OperKinds::LThan \|\| compop == OperKinds::LEThan ? // choose += or -= for upto/downto
197	OperKinds::PlusAssn : OperKinds::MinusAssn, new ExpressionNode( build_varref( new string( *index ) ) ), inc ) ) );
198	} // forCtrl
199
200	ForCtrl * forCtrl( ExpressionNode * type, ExpressionNode * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
201	if ( NameExpr * identifier = dynamic_cast<NameExpr *>(index->get_expr()) ) {
202	return forCtrl( type, new string( identifier->name ), start, compop, comp, inc );
203	} else {
204	SemanticError( yylloc, "Expression disallowed. Only loop-index name allowed" ); return nullptr;
205	} // if
206	} // forCtrl
207
208
209	bool forall = false, yyy = false; // aggregate have one or more forall qualifiers ?
210
211	// https://www.gnu.org/software/bison/manual/bison.html#Location-Type
212	#define YYLLOC_DEFAULT(Cur, Rhs, N) \
213	if ( N ) { \
214	(Cur).first_line = YYRHSLOC( Rhs, 1 ).first_line; \
215	(Cur).first_column = YYRHSLOC( Rhs, 1 ).first_column; \
216	(Cur).last_line = YYRHSLOC( Rhs, N ).last_line; \
217	(Cur).last_column = YYRHSLOC( Rhs, N ).last_column; \
218	(Cur).filename = YYRHSLOC( Rhs, 1 ).filename; \
219	} else { \
220	(Cur).first_line = (Cur).last_line = YYRHSLOC( Rhs, 0 ).last_line; \
221	(Cur).first_column = (Cur).last_column = YYRHSLOC( Rhs, 0 ).last_column; \
222	(Cur).filename = YYRHSLOC( Rhs, 0 ).filename; \
223	}
224	%}
225
226	%define parse.error verbose
227
228	// Types declaration for productions
229	%union {
230	Token tok;
231	ParseNode * pn;
232	ExpressionNode * en;
233	DeclarationNode * decl;
234	DeclarationNode::Aggregate aggKey;
235	DeclarationNode::TypeClass tclass;
236	StatementNode * sn;
237	WaitForStmt * wfs;
238	Expression * constant;
239	IfCtrl * ifctl;
240	ForCtrl * fctl;
241	enum OperKinds compop;
242	LabelNode * label;
243	InitializerNode * in;
244	OperKinds op;
245	std::string * str;
246	bool flag;
247	CatchStmt::Kind catch_kind;
248	GenericExpr * genexpr;
249	}
250
251	//*********************** TERMINAL TOKENS ******************************
252
253	// keywords
254	%token TYPEDEF
255	%token EXTERN STATIC AUTO REGISTER
256	%token THREADLOCAL // C11
257	%token INLINE FORTRAN // C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
258	%token NORETURN // C11
259	%token CONST VOLATILE
260	%token RESTRICT // C99
261	%token ATOMIC // C11
262	%token FORALL MUTEX VIRTUAL // CFA
263	%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED
264	%token BOOL COMPLEX IMAGINARY // C99
265	%token INT128 FLOAT80 FLOAT128 // GCC
266	%token ZERO_T ONE_T // CFA
267	%token VALIST // GCC
268	%token TYPEOF BASETYPEOF LABEL // GCC
269	%token ENUM STRUCT UNION
270	%token EXCEPTION // CFA
271	%token COROUTINE MONITOR THREAD // CFA
272	%token OTYPE FTYPE DTYPE TTYPE TRAIT // CFA
273	%token SIZEOF OFFSETOF
274	%token ATTRIBUTE EXTENSION // GCC
275	%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
276	%token CHOOSE DISABLE ENABLE FALLTHRU FALLTHROUGH TRY CATCH CATCHRESUME FINALLY THROW THROWRESUME AT WITH WHEN WAITFOR // CFA
277	%token ASM // C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
278	%token ALIGNAS ALIGNOF GENERIC STATICASSERT // C11
279
280	// names and constants: lexer differentiates between identifier and typedef names
281	%token<tok> IDENTIFIER QUOTED_IDENTIFIER TYPEDEFname TYPEGENname
282	%token<tok> TIMEOUT WOR
283	%token<tok> ATTR_IDENTIFIER ATTR_TYPEDEFname ATTR_TYPEGENname
284	%token<tok> INTEGERconstant CHARACTERconstant STRINGliteral
285	%token<tok> DIRECTIVE
286	// Floating point constant is broken into three kinds of tokens because of the ambiguity with tuple indexing and
287	// overloading constants 0/1, e.g., x.1 is lexed as (x)(.1), where (.1) is a factional constant, but is semantically
288	// converted into the tuple index (.)(1). e.g., 3.x
289	%token<tok> FLOATING_DECIMALconstant FLOATING_FRACTIONconstant FLOATINGconstant
290
291	// multi-character operators
292	%token ARROW // ->
293	%token ICR DECR // ++ --
294	%token LS RS // << >>
295	%token LE GE EQ NE // <= >= == !=
296	%token ANDAND OROR // && \|\|
297	%token ELLIPSIS // ...
298
299	%token EXPassign MULTassign DIVassign MODassign // \= *= /= %=
300	%token PLUSassign MINUSassign // += -=
301	%token LSassign RSassign // <<= >>=
302	%token ANDassign ERassign ORassign // &= ^= \|=
303
304	%token ErangeUpEq ErangeDown ErangeDownEq // ~= -~ -~=
305	%token ATassign // @=
306
307	%type<tok> identifier no_attr_identifier
308	%type<tok> identifier_or_type_name no_attr_identifier_or_type_name attr_name
309	%type<tok> quasi_keyword
310	%type<constant> string_literal
311	%type<str> string_literal_list
312
313	// expressions
314	%type<en> constant
315	%type<en> tuple tuple_expression_list
316	%type<op> ptrref_operator unary_operator assignment_operator
317	%type<en> primary_expression postfix_expression unary_expression
318	%type<en> cast_expression exponential_expression multiplicative_expression additive_expression
319	%type<en> shift_expression relational_expression equality_expression
320	%type<en> AND_expression exclusive_OR_expression inclusive_OR_expression
321	%type<en> logical_AND_expression logical_OR_expression
322	%type<en> conditional_expression constant_expression assignment_expression assignment_expression_opt
323	%type<en> comma_expression comma_expression_opt
324	%type<en> argument_expression_list argument_expression default_initialize_opt
325	%type<ifctl> if_control_expression
326	%type<fctl> for_control_expression
327	%type<compop> inclexcl
328	%type<en> subrange
329	%type<decl> asm_name_opt
330	%type<en> asm_operands_opt asm_operands_list asm_operand
331	%type<label> label_list
332	%type<en> asm_clobbers_list_opt
333	%type<flag> asm_volatile_opt
334	%type<en> handler_predicate_opt
335	%type<genexpr> generic_association generic_assoc_list
336
337	// statements
338	%type<sn> statement labeled_statement compound_statement
339	%type<sn> statement_decl statement_decl_list statement_list_nodecl
340	%type<sn> selection_statement if_statement
341	%type<sn> switch_clause_list_opt switch_clause_list
342	%type<en> case_value
343	%type<sn> case_clause case_value_list case_label case_label_list
344	%type<sn> iteration_statement jump_statement
345	%type<sn> expression_statement asm_statement
346	%type<sn> with_statement
347	%type<en> with_clause_opt
348	%type<sn> exception_statement handler_clause finally_clause
349	%type<catch_kind> handler_key
350	%type<sn> mutex_statement
351	%type<en> when_clause when_clause_opt waitfor timeout
352	%type<sn> waitfor_statement
353	%type<wfs> waitfor_clause
354
355	// declarations
356	%type<decl> abstract_declarator abstract_ptr abstract_array abstract_function array_dimension multi_array_dimension
357	%type<decl> abstract_parameter_declarator abstract_parameter_ptr abstract_parameter_array abstract_parameter_function array_parameter_dimension array_parameter_1st_dimension
358	%type<decl> abstract_parameter_declaration
359
360	%type<aggKey> aggregate_key
361	%type<decl> aggregate_type aggregate_type_nobody
362
363	%type<decl> assertion assertion_list assertion_list_opt
364
365	%type<en> bit_subrange_size_opt bit_subrange_size
366
367	%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type indirect_type
368
369	%type<decl> trait_declaration trait_declaration_list trait_declaring_list trait_specifier
370
371	%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
372	%type<decl> declaration_specifier declaration_specifier_nobody declarator declaring_list
373
374	%type<decl> elaborated_type elaborated_type_nobody
375
376	%type<decl> enumerator_list enum_type enum_type_nobody
377	%type<en> enumerator_value_opt
378
379	%type<decl> external_definition external_definition_list external_definition_list_opt
380
381	%type<decl> exception_declaration
382
383	%type<decl> field_declaration_list_opt field_declaration field_declaring_list_opt field_declarator field_abstract_list_opt field_abstract
384	%type<en> field field_name_list field_name fraction_constants_opt
385
386	%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr
387
388	%type<decl> identifier_parameter_declarator identifier_parameter_ptr identifier_parameter_array identifier_parameter_function
389	%type<decl> identifier_list
390
391	%type<decl> cfa_abstract_array cfa_abstract_declarator_no_tuple cfa_abstract_declarator_tuple
392	%type<decl> cfa_abstract_function cfa_abstract_parameter_declaration cfa_abstract_parameter_list
393	%type<decl> cfa_abstract_ptr cfa_abstract_tuple
394
395	%type<decl> cfa_array_parameter_1st_dimension
396
397	%type<decl> cfa_trait_declaring_list cfa_declaration cfa_field_declaring_list cfa_field_abstract_list
398	%type<decl> cfa_function_declaration cfa_function_return cfa_function_specifier
399
400	%type<decl> cfa_identifier_parameter_array cfa_identifier_parameter_declarator_no_tuple
401	%type<decl> cfa_identifier_parameter_declarator_tuple cfa_identifier_parameter_ptr
402
403	%type<decl> cfa_parameter_declaration cfa_parameter_list cfa_parameter_ellipsis_list_opt
404
405	%type<decl> cfa_typedef_declaration cfa_variable_declaration cfa_variable_specifier
406
407	%type<decl> c_declaration static_assert
408	%type<decl> KR_function_declarator KR_function_no_ptr KR_function_ptr KR_function_array
409	%type<decl> KR_parameter_list KR_parameter_list_opt
410
411	%type<decl> parameter_declaration parameter_list parameter_type_list_opt
412
413	%type<decl> paren_identifier paren_type
414
415	%type<decl> storage_class storage_class_list
416
417	%type<decl> sue_declaration_specifier sue_declaration_specifier_nobody sue_type_specifier sue_type_specifier_nobody
418
419	%type<tclass> type_class
420	%type<decl> type_declarator type_declarator_name type_declaring_list
421
422	%type<decl> type_declaration_specifier type_type_specifier type_name typegen_name
423	%type<decl> typedef typedef_declaration typedef_expression
424
425	%type<decl> variable_type_redeclarator type_ptr type_array type_function
426
427	%type<decl> type_parameter_redeclarator type_parameter_ptr type_parameter_array type_parameter_function
428
429	%type<decl> type type_no_function
430	%type<decl> type_parameter type_parameter_list type_initializer_opt
431
432	%type<en> type_parameters_opt type_list
433
434	%type<decl> type_qualifier type_qualifier_name forall type_qualifier_list_opt type_qualifier_list
435	%type<decl> type_specifier type_specifier_nobody
436
437	%type<decl> variable_declarator variable_ptr variable_array variable_function
438	%type<decl> variable_abstract_declarator variable_abstract_ptr variable_abstract_array variable_abstract_function
439
440	%type<decl> attribute_list_opt attribute_list attribute_name_list attribute attribute_name
441
442	// initializers
443	%type<in> initializer initializer_list_opt initializer_opt
444
445	// designators
446	%type<en> designator designator_list designation
447
448
449	// Handle shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string is ambiguous:
450	// .---------. matches IF '(' comma_expression ')' statement . (reduce)
451	// if ( C ) S1 else S2
452	// `-----------------' matches IF '(' comma_expression ')' statement . (shift) ELSE statement */
453	// Similar issues exit with the waitfor statement.
454
455	// Order of these lines matters (low-to-high precedence). THEN is left associative over WOR/TIMEOUT/ELSE, WOR is left
456	// associative over TIMEOUT/ELSE, and TIMEOUT is left associative over ELSE.
457	%precedence THEN // rule precedence for IF/WAITFOR statement
458	%precedence WOR // token precedence for start of WOR in WAITFOR statement
459	%precedence TIMEOUT // token precedence for start of TIMEOUT in WAITFOR statement
460	%precedence ELSE // token precedence for start of else clause in IF/WAITFOR statement
461
462	// Handle shift/reduce conflict for generic type by shifting the '(' token. For example, this string is ambiguous:
463	// forall( otype T ) struct Foo { T v; };
464	// .-----. matches pointer to function returning a generic (which is impossible without a type)
465	// Foo ( *fp )( int );
466	// `---' matches start of TYPEGENname '('
467	// must be:
468	// Foo( int ) ( *fp )( int );
469	// The same problem occurs here:
470	// forall( otype T ) struct Foo { T v; } ( *fp )( int );
471	// must be:
472	// forall( otype T ) struct Foo { T v; } ( int ) ( *fp )( int );
473
474	// Order of these lines matters (low-to-high precedence).
475	%precedence TYPEGENname
476	%precedence '}'
477	%precedence '('
478
479	%locations // support location tracking for error messages
480
481	%start translation_unit // parse-tree root
482
483	%%
484	//*********************** Namespace Management ******************************
485
486	// The C grammar is not context free because it relies on the distinct terminal symbols "identifier" and "TYPEDEFname",
487	// which are lexically identical.
488	//
489	// typedef int foo; // identifier foo must now be scanned as TYPEDEFname
490	// foo f; // to allow it to appear in this context
491	//
492	// While it may be possible to write a purely context-free grammar, such a grammar would obscure the relationship
493	// between syntactic and semantic constructs. Cforall compounds this problem by introducing type names local to the
494	// scope of a declaration (for instance, those introduced through "forall" qualifiers), and by introducing "type
495	// generators" -- parameterized types. This latter type name creates a third class of identifiers, "TYPEGENname", which
496	// must be distinguished by the lexical scanner.
497	//
498	// Since the scanner cannot distinguish among the different classes of identifiers without some context information,
499	// there is a type table (typedefTable), which holds type names and identifiers that override type names, for each named
500	// scope. During parsing, semantic actions update the type table by adding new identifiers in the current scope. For
501	// each context that introduces a name scope, a new level is created in the type table and that level is popped on
502	// exiting the scope. Since type names can be local to a particular declaration, each declaration is itself a scope.
503	// This requires distinguishing between type names that are local to the current declaration scope and those that
504	// persist past the end of the declaration (i.e., names defined in "typedef" or "otype" declarations).
505	//
506	// The non-terminals "push" and "pop" denote the opening and closing of named scopes. Every push has a matching pop in
507	// the production rule. There are multiple lists of declarations, where each declaration is a named scope, so pop/push
508	// around the list separator.
509	//
510	// int f( forall(T) T (f1) T , forall( S ) S (f2)( S ) );
511	// push pop push pop
512
513	push:
514	{ typedefTable.enterScope(); }
515	;
516
517	pop:
518	{ typedefTable.leaveScope(); }
519	;
520
521	//*********************** CONSTANTS ******************************
522
523	constant:
524	// ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
525	INTEGERconstant { $$ = new ExpressionNode( build_constantInteger( *$1 ) ); }
526	\| FLOATING_DECIMALconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
527	\| FLOATING_FRACTIONconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
528	\| FLOATINGconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
529	\| CHARACTERconstant { $$ = new ExpressionNode( build_constantChar( *$1 ) ); }
530	;
531
532	quasi_keyword: // CFA
533	TIMEOUT
534	\| WOR
535	;
536
537	no_attr_identifier:
538	IDENTIFIER
539	\| quasi_keyword
540	\| '@' // CFA
541	{ Token tok = { new string( DeclarationNode::anonymous.newName() ), yylval.tok.loc }; $$ = tok; }
542	;
543
544	identifier:
545	no_attr_identifier
546	\| ATTR_IDENTIFIER // CFA
547	;
548
549	string_literal:
550	string_literal_list { $$ = build_constantStr( *$1 ); }
551	;
552
553	string_literal_list: // juxtaposed strings are concatenated
554	STRINGliteral { $$ = $1; } // conversion from tok to str
555	\| string_literal_list STRINGliteral
556	{
557	if ( ! appendStr( $1, $2 ) ) YYERROR; // append 2nd juxtaposed string to 1st
558	delete $2; // allocated by lexer
559	$$ = $1; // conversion from tok to str
560	}
561	;
562
563	//*********************** EXPRESSIONS ******************************
564
565	primary_expression:
566	IDENTIFIER // typedef name cannot be used as a variable name
567	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
568	\| quasi_keyword
569	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
570	\| tuple
571	\| '(' comma_expression ')'
572	{ $$ = $2; }
573	\| '(' compound_statement ')' // GCC, lambda expression
574	{ $$ = new ExpressionNode( new StmtExpr( dynamic_cast< CompoundStmt * >(maybeMoveBuild< Statement >($2) ) ) ); }
575	\| constant '`' IDENTIFIER // CFA, postfix call
576	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_postfix_name( $3 ) ), $1 ) ); }
577	\| string_literal '`' IDENTIFIER // CFA, postfix call
578	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_postfix_name( $3 ) ), new ExpressionNode( $1 ) ) ); }
579	\| IDENTIFIER '`' IDENTIFIER // CFA, postfix call
580	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_postfix_name( $3 ) ), new ExpressionNode( build_varref( $1 ) ) ) ); }
581	\| tuple '`' IDENTIFIER // CFA, postfix call
582	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_postfix_name( $3 ) ), $1 ) ); }
583	\| '(' comma_expression ')' '`' IDENTIFIER // CFA, postfix call
584	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_postfix_name( $5 ) ), $2 ) ); }
585	\| type_name '.' no_attr_identifier // CFA, nested type
586	{ SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
587	\| type_name '.' '[' field_name_list ']' // CFA, nested type / tuple field selector
588	{ SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
589	\| GENERIC '(' assignment_expression ',' generic_assoc_list ')' // C11
590	{
591	// add the missing control expression to the GenericExpr and return it
592	$5->control = maybeMoveBuild<Expression>( $3 );
593	$$ = new ExpressionNode( $5 );
594	}
595	;
596
597	generic_assoc_list: // C11
598	generic_association
599	\| generic_assoc_list ',' generic_association
600	{
601	// steal the association node from the singleton and delete the wrapper
602	$1->associations.splice($1->associations.end(), $3->associations);
603	delete $3;
604	$$ = $1;
605	}
606	;
607
608	generic_association: // C11
609	type_no_function ':' assignment_expression
610	{
611	// create a GenericExpr wrapper with one association pair
612	$$ = new GenericExpr( nullptr, { { maybeMoveBuildType($1), maybeMoveBuild<Expression>($3) } } );
613	}
614	\| DEFAULT ':' assignment_expression
615	{ $$ = new GenericExpr( nullptr, { { maybeMoveBuild<Expression>($3) } } ); }
616	;
617
618	postfix_expression:
619	primary_expression
620	\| postfix_expression '[' assignment_expression ']'
621	// CFA, comma_expression disallowed in this context because it results in a common user error: subscripting a
622	// matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
623	// little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
624	// equivalent to the old x[i,j].
625	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Index, $1, $3 ) ); }
626	\| postfix_expression '{' argument_expression_list '}' // CFA, constructor call
627	{
628	Token fn;
629	fn.str = new std::string( "?{}" ); // location undefined - use location of '{'?
630	$$ = new ExpressionNode( new ConstructorExpr( build_func( new ExpressionNode( build_varref( fn ) ), (ExpressionNode *)( $1 )->set_last( $3 ) ) ) );
631	}
632	\| postfix_expression '(' argument_expression_list ')'
633	{ $$ = new ExpressionNode( build_func( $1, $3 ) ); }
634	\| postfix_expression '.' no_attr_identifier
635	{ $$ = new ExpressionNode( build_fieldSel( $1, build_varref( $3 ) ) ); }
636	\| postfix_expression '.' INTEGERconstant // CFA, tuple index
637	{ $$ = new ExpressionNode( build_fieldSel( $1, build_constantInteger( *$3 ) ) ); }
638	\| postfix_expression FLOATING_FRACTIONconstant // CFA, tuple index
639	{ $$ = new ExpressionNode( build_fieldSel( $1, build_field_name_FLOATING_FRACTIONconstant( *$2 ) ) ); }
640	\| postfix_expression '.' '[' field_name_list ']' // CFA, tuple field selector
641	{ $$ = new ExpressionNode( build_fieldSel( $1, build_tuple( $4 ) ) ); }
642	\| postfix_expression ARROW no_attr_identifier
643	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_varref( $3 ) ) ); }
644	\| postfix_expression ARROW INTEGERconstant // CFA, tuple index
645	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_constantInteger( *$3 ) ) ); }
646	\| postfix_expression ARROW '[' field_name_list ']' // CFA, tuple field selector
647	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_tuple( $4 ) ) ); }
648	\| postfix_expression ICR
649	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::IncrPost, $1 ) ); }
650	\| postfix_expression DECR
651	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::DecrPost, $1 ) ); }
652	\| '(' type_no_function ')' '{' initializer_list_opt comma_opt '}' // C99, compound-literal
653	{ $$ = new ExpressionNode( build_compoundLiteral( $2, new InitializerNode( $5, true ) ) ); }
654	\| '(' type_no_function ')' '@' '{' initializer_list_opt comma_opt '}' // CFA, explicit C compound-literal
655	{ $$ = new ExpressionNode( build_compoundLiteral( $2, (new InitializerNode( $6, true ))->set_maybeConstructed( false ) ) ); }
656	\| '^' primary_expression '{' argument_expression_list '}' // CFA
657	{
658	Token fn;
659	fn.str = new string( "^?{}" ); // location undefined
660	$$ = new ExpressionNode( build_func( new ExpressionNode( build_varref( fn ) ), (ExpressionNode *)( $2 )->set_last( $4 ) ) );
661	}
662	;
663
664	argument_expression_list:
665	argument_expression
666	\| argument_expression_list ',' argument_expression
667	{ $$ = (ExpressionNode *)( $1->set_last( $3 )); }
668	;
669
670	argument_expression:
671	// empty
672	{ $$ = nullptr; }
673	\| '?' // CFA, default parameter
674	{ SemanticError( yylloc, "Default parameter for argument is currently unimplemented." ); $$ = nullptr; }
675	// { $$ = new ExpressionNode( build_constantInteger( *new string( "2" ) ) ); }
676	\| assignment_expression
677	;
678
679	field_name_list: // CFA, tuple field selector
680	field
681	\| field_name_list ',' field { $$ = (ExpressionNode *)$1->set_last( $3 ); }
682	;
683
684	field: // CFA, tuple field selector
685	field_name
686	\| FLOATING_DECIMALconstant field
687	{ $$ = new ExpressionNode( build_fieldSel( new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( *$1 ) ), maybeMoveBuild<Expression>( $2 ) ) ); }
688	\| FLOATING_DECIMALconstant '[' field_name_list ']'
689	{ $$ = new ExpressionNode( build_fieldSel( new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( *$1 ) ), build_tuple( $3 ) ) ); }
690	\| field_name '.' field
691	{ $$ = new ExpressionNode( build_fieldSel( $1, maybeMoveBuild<Expression>( $3 ) ) ); }
692	\| field_name '.' '[' field_name_list ']'
693	{ $$ = new ExpressionNode( build_fieldSel( $1, build_tuple( $4 ) ) ); }
694	\| field_name ARROW field
695	{ $$ = new ExpressionNode( build_pfieldSel( $1, maybeMoveBuild<Expression>( $3 ) ) ); }
696	\| field_name ARROW '[' field_name_list ']'
697	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_tuple( $4 ) ) ); }
698	;
699
700	field_name:
701	INTEGERconstant fraction_constants_opt
702	{ $$ = new ExpressionNode( build_field_name_fraction_constants( build_constantInteger( *$1 ), $2 ) ); }
703	\| FLOATINGconstant fraction_constants_opt
704	{ $$ = new ExpressionNode( build_field_name_fraction_constants( build_field_name_FLOATINGconstant( *$1 ), $2 ) ); }
705	\| no_attr_identifier fraction_constants_opt
706	{
707	$$ = new ExpressionNode( build_field_name_fraction_constants( build_varref( $1 ), $2 ) );
708	}
709	;
710
711	fraction_constants_opt:
712	// empty
713	{ $$ = nullptr; }
714	\| fraction_constants_opt FLOATING_FRACTIONconstant
715	{
716	Expression * constant = build_field_name_FLOATING_FRACTIONconstant( *$2 );
717	$$ = $1 != nullptr ? new ExpressionNode( build_fieldSel( $1, constant ) ) : new ExpressionNode( constant );
718	}
719	;
720
721	unary_expression:
722	postfix_expression
723	// first location where constant/string can have operator applied: sizeof 3/sizeof "abc" still requires
724	// semantics checks, e.g., ++3, 3--, *3, &&3
725	\| constant
726	\| string_literal
727	{ $$ = new ExpressionNode( $1 ); }
728	\| EXTENSION cast_expression // GCC
729	{ $$ = $2->set_extension( true ); }
730	// '*' ('&') is separated from unary_operator because of shift/reduce conflict in:
731	// { * X; } // dereference X
732	// { * int X; } // CFA declaration of pointer to int
733	\| ptrref_operator cast_expression // CFA
734	{
735	switch ( $1 ) {
736	case OperKinds::AddressOf:
737	$$ = new ExpressionNode( new AddressExpr( maybeMoveBuild< Expression >( $2 ) ) );
738	break;
739	case OperKinds::PointTo:
740	$$ = new ExpressionNode( build_unary_val( $1, $2 ) );
741	break;
742	case OperKinds::And:
743	$$ = new ExpressionNode( new AddressExpr( new AddressExpr( maybeMoveBuild< Expression >( $2 ) ) ) );
744	break;
745	default:
746	assert( false );
747	}
748	}
749	\| unary_operator cast_expression
750	{ $$ = new ExpressionNode( build_unary_val( $1, $2 ) ); }
751	\| ICR unary_expression
752	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::Incr, $2 ) ); }
753	\| DECR unary_expression
754	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::Decr, $2 ) ); }
755	\| SIZEOF unary_expression
756	{ $$ = new ExpressionNode( new SizeofExpr( maybeMoveBuild< Expression >( $2 ) ) ); }
757	\| SIZEOF '(' type_no_function ')'
758	{ $$ = new ExpressionNode( new SizeofExpr( maybeMoveBuildType( $3 ) ) ); }
759	\| ALIGNOF unary_expression // GCC, variable alignment
760	{ $$ = new ExpressionNode( new AlignofExpr( maybeMoveBuild< Expression >( $2 ) ) ); }
761	\| ALIGNOF '(' type_no_function ')' // GCC, type alignment
762	{ $$ = new ExpressionNode( new AlignofExpr( maybeMoveBuildType( $3 ) ) ); }
763	\| OFFSETOF '(' type_no_function ',' no_attr_identifier ')'
764	{ $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) ); }
765	\| ATTR_IDENTIFIER
766	{ $$ = new ExpressionNode( new AttrExpr( build_varref( $1 ), maybeMoveBuild< Expression >( (ExpressionNode *)nullptr ) ) ); }
767	\| ATTR_IDENTIFIER '(' argument_expression ')'
768	{ $$ = new ExpressionNode( new AttrExpr( build_varref( $1 ), maybeMoveBuild< Expression >( $3 ) ) ); }
769	\| ATTR_IDENTIFIER '(' type ')'
770	{ $$ = new ExpressionNode( new AttrExpr( build_varref( $1 ), maybeMoveBuildType( $3 ) ) ); }
771	;
772
773	ptrref_operator:
774	'*' { $$ = OperKinds::PointTo; }
775	\| '&' { $$ = OperKinds::AddressOf; }
776	// GCC, address of label must be handled by semantic check for ref,ref,label
777	\| ANDAND { $$ = OperKinds::And; }
778	;
779
780	unary_operator:
781	'+' { $$ = OperKinds::UnPlus; }
782	\| '-' { $$ = OperKinds::UnMinus; }
783	\| '!' { $$ = OperKinds::Neg; }
784	\| '~' { $$ = OperKinds::BitNeg; }
785	;
786
787	cast_expression:
788	unary_expression
789	\| '(' type_no_function ')' cast_expression
790	{ $$ = new ExpressionNode( build_cast( $2, $4 ) ); }
791	\| '(' COROUTINE '&' ')' cast_expression // CFA
792	{ $$ = new ExpressionNode( build_keyword_cast( KeywordCastExpr::Coroutine, $5 ) ); }
793	\| '(' THREAD '&' ')' cast_expression // CFA
794	{ $$ = new ExpressionNode( build_keyword_cast( KeywordCastExpr::Thread, $5 ) ); }
795	\| '(' MONITOR '&' ')' cast_expression // CFA
796	{ $$ = new ExpressionNode( build_keyword_cast( KeywordCastExpr::Monitor, $5 ) ); }
797	// VIRTUAL cannot be opt because of look ahead issues
798	\| '(' VIRTUAL ')' cast_expression // CFA
799	{ $$ = new ExpressionNode( new VirtualCastExpr( maybeMoveBuild< Expression >( $4 ), maybeMoveBuildType( nullptr ) ) ); }
800	\| '(' VIRTUAL type_no_function ')' cast_expression // CFA
801	{ $$ = new ExpressionNode( new VirtualCastExpr( maybeMoveBuild< Expression >( $5 ), maybeMoveBuildType( $3 ) ) ); }
802	// \| '(' type_no_function ')' tuple
803	// { $$ = new ExpressionNode( build_cast( $2, $4 ) ); }
804	;
805
806	exponential_expression:
807	cast_expression
808	\| exponential_expression '\\' cast_expression
809	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Exp, $1, $3 ) ); }
810	;
811
812	multiplicative_expression:
813	exponential_expression
814	\| multiplicative_expression '*' exponential_expression
815	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Mul, $1, $3 ) ); }
816	\| multiplicative_expression '/' exponential_expression
817	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Div, $1, $3 ) ); }
818	\| multiplicative_expression '%' exponential_expression
819	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Mod, $1, $3 ) ); }
820	;
821
822	additive_expression:
823	multiplicative_expression
824	\| additive_expression '+' multiplicative_expression
825	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Plus, $1, $3 ) ); }
826	\| additive_expression '-' multiplicative_expression
827	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Minus, $1, $3 ) ); }
828	;
829
830	shift_expression:
831	additive_expression
832	\| shift_expression LS additive_expression
833	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LShift, $1, $3 ) ); }
834	\| shift_expression RS additive_expression
835	{ $$ = new ExpressionNode( build_binary_val( OperKinds::RShift, $1, $3 ) ); }
836	;
837
838	relational_expression:
839	shift_expression
840	\| relational_expression '<' shift_expression
841	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LThan, $1, $3 ) ); }
842	\| relational_expression '>' shift_expression
843	{ $$ = new ExpressionNode( build_binary_val( OperKinds::GThan, $1, $3 ) ); }
844	\| relational_expression LE shift_expression
845	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LEThan, $1, $3 ) ); }
846	\| relational_expression GE shift_expression
847	{ $$ = new ExpressionNode( build_binary_val( OperKinds::GEThan, $1, $3 ) ); }
848	;
849
850	equality_expression:
851	relational_expression
852	\| equality_expression EQ relational_expression
853	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Eq, $1, $3 ) ); }
854	\| equality_expression NE relational_expression
855	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Neq, $1, $3 ) ); }
856	;
857
858	AND_expression:
859	equality_expression
860	\| AND_expression '&' equality_expression
861	{ $$ = new ExpressionNode( build_binary_val( OperKinds::BitAnd, $1, $3 ) ); }
862	;
863
864	exclusive_OR_expression:
865	AND_expression
866	\| exclusive_OR_expression '^' AND_expression
867	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Xor, $1, $3 ) ); }
868	;
869
870	inclusive_OR_expression:
871	exclusive_OR_expression
872	\| inclusive_OR_expression '\|' exclusive_OR_expression
873	{ $$ = new ExpressionNode( build_binary_val( OperKinds::BitOr, $1, $3 ) ); }
874	;
875
876	logical_AND_expression:
877	inclusive_OR_expression
878	\| logical_AND_expression ANDAND inclusive_OR_expression
879	{ $$ = new ExpressionNode( build_and_or( $1, $3, true ) ); }
880	;
881
882	logical_OR_expression:
883	logical_AND_expression
884	\| logical_OR_expression OROR logical_AND_expression
885	{ $$ = new ExpressionNode( build_and_or( $1, $3, false ) ); }
886	;
887
888	conditional_expression:
889	logical_OR_expression
890	\| logical_OR_expression '?' comma_expression ':' conditional_expression
891	{ $$ = new ExpressionNode( build_cond( $1, $3, $5 ) ); }
892	// FIX ME: computes $1 twice
893	\| logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
894	{ $$ = new ExpressionNode( build_cond( $1, $1, $4 ) ); }
895	;
896
897	constant_expression:
898	conditional_expression
899	;
900
901	assignment_expression:
902	// CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
903	conditional_expression
904	\| unary_expression assignment_operator assignment_expression
905	{ $$ = new ExpressionNode( build_binary_val( $2, $1, $3 ) ); }
906	\| unary_expression '=' '{' initializer_list_opt comma_opt '}'
907	{ SemanticError( yylloc, "Initializer assignment is currently unimplemented." ); $$ = nullptr; }
908	;
909
910	assignment_expression_opt:
911	// empty
912	{ $$ = nullptr; }
913	\| assignment_expression
914	;
915
916	assignment_operator:
917	'=' { $$ = OperKinds::Assign; }
918	\| ATassign { $$ = OperKinds::AtAssn; }
919	\| EXPassign { $$ = OperKinds::ExpAssn; }
920	\| MULTassign { $$ = OperKinds::MulAssn; }
921	\| DIVassign { $$ = OperKinds::DivAssn; }
922	\| MODassign { $$ = OperKinds::ModAssn; }
923	\| PLUSassign { $$ = OperKinds::PlusAssn; }
924	\| MINUSassign { $$ = OperKinds::MinusAssn; }
925	\| LSassign { $$ = OperKinds::LSAssn; }
926	\| RSassign { $$ = OperKinds::RSAssn; }
927	\| ANDassign { $$ = OperKinds::AndAssn; }
928	\| ERassign { $$ = OperKinds::ERAssn; }
929	\| ORassign { $$ = OperKinds::OrAssn; }
930	;
931
932	tuple: // CFA, tuple
933	// CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
934	// comma_expression in cfa_identifier_parameter_array and cfa_abstract_array
935	// '[' ']'
936	// { $$ = new ExpressionNode( build_tuple() ); }
937	// \| '[' push assignment_expression pop ']'
938	// { $$ = new ExpressionNode( build_tuple( $3 ) ); }
939	'[' ',' tuple_expression_list ']'
940	{ $$ = new ExpressionNode( build_tuple( (ExpressionNode *)(new ExpressionNode( nullptr ) )->set_last( $3 ) ) ); }
941	\| '[' push assignment_expression pop ',' tuple_expression_list ']'
942	{ $$ = new ExpressionNode( build_tuple( (ExpressionNode *)$3->set_last( $6 ) ) ); }
943	;
944
945	tuple_expression_list:
946	assignment_expression_opt
947	\| tuple_expression_list ',' assignment_expression_opt
948	{ $$ = (ExpressionNode *)$1->set_last( $3 ); }
949	;
950
951	comma_expression:
952	assignment_expression
953	\| comma_expression ',' assignment_expression
954	{ $$ = new ExpressionNode( new CommaExpr( maybeMoveBuild< Expression >( $1 ), maybeMoveBuild< Expression >( $3 ) ) ); }
955	;
956
957	comma_expression_opt:
958	// empty
959	{ $$ = nullptr; }
960	\| comma_expression
961	;
962
963	//************************* STATEMENTS *****************************
964
965	statement:
966	labeled_statement
967	\| compound_statement
968	\| expression_statement
969	\| selection_statement
970	\| iteration_statement
971	\| jump_statement
972	\| with_statement
973	\| mutex_statement
974	\| waitfor_statement
975	\| exception_statement
976	\| enable_disable_statement
977	{ SemanticError( yylloc, "enable/disable statement is currently unimplemented." ); $$ = nullptr; }
978	\| asm_statement
979	\| DIRECTIVE
980	{ $$ = new StatementNode( build_directive( $1 ) ); }
981	;
982
983	labeled_statement:
984	// labels cannot be identifiers 0 or 1 or ATTR_IDENTIFIER
985	identifier_or_type_name ':' attribute_list_opt statement
986	{
987	$$ = $4->add_label( $1, $3 );
988	}
989	;
990
991	compound_statement:
992	'{' '}'
993	{ $$ = new StatementNode( build_compound( (StatementNode *)0 ) ); }
994	\| '{' push
995	local_label_declaration_opt // GCC, local labels
996	statement_decl_list // C99, intermix declarations and statements
997	pop '}'
998	{ $$ = new StatementNode( build_compound( $4 ) ); }
999	;
1000
1001	statement_decl_list: // C99
1002	statement_decl
1003	\| statement_decl_list statement_decl
1004	{ if ( $1 != 0 ) { $1->set_last( $2 ); $$ = $1; } }
1005	;
1006
1007	statement_decl:
1008	declaration // CFA, new & old style declarations
1009	{ $$ = new StatementNode( $1 ); }
1010	\| EXTENSION declaration // GCC
1011	{
1012	distExt( $2 );
1013	$$ = new StatementNode( $2 );
1014	}
1015	\| function_definition
1016	{ $$ = new StatementNode( $1 ); }
1017	\| EXTENSION function_definition // GCC
1018	{
1019	distExt( $2 );
1020	$$ = new StatementNode( $2 );
1021	}
1022	\| statement
1023	;
1024
1025	statement_list_nodecl:
1026	statement
1027	\| statement_list_nodecl statement
1028	{ if ( $1 != 0 ) { $1->set_last( $2 ); $$ = $1; } }
1029	;
1030
1031	expression_statement:
1032	comma_expression_opt ';'
1033	{ $$ = new StatementNode( build_expr( $1 ) ); }
1034	;
1035
1036	selection_statement:
1037	// pop causes a S/R conflict without separating the IF statement into a non-terminal even after resolving
1038	// the inherent S/R conflict with THEN/ELSE.
1039	push if_statement pop
1040	{ $$ = $2; }
1041	\| SWITCH '(' comma_expression ')' case_clause
1042	{ $$ = new StatementNode( build_switch( true, $3, $5 ) ); }
1043	\| SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1044	{
1045	StatementNode *sw = new StatementNode( build_switch( true, $3, $8 ) );
1046	// The semantics of the declaration list is changed to include associated initialization, which is performed
1047	// before the transfer to the appropriate case clause by hoisting the declarations into a compound
1048	// statement around the switch. Statements after the initial declaration list can never be executed, and
1049	// therefore, are removed from the grammar even though C allows it. The change also applies to choose
1050	// statement.
1051	$$ = $7 ? new StatementNode( build_compound( (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1052	}
1053	\| CHOOSE '(' comma_expression ')' case_clause // CFA
1054	{ $$ = new StatementNode( build_switch( false, $3, $5 ) ); }
1055	\| CHOOSE '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1056	{
1057	StatementNode *sw = new StatementNode( build_switch( false, $3, $8 ) );
1058	$$ = $7 ? new StatementNode( build_compound( (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1059	}
1060	;
1061
1062	if_statement:
1063	IF '(' if_control_expression ')' statement %prec THEN
1064	// explicitly deal with the shift/reduce conflict on if/else
1065	{ $$ = new StatementNode( build_if( $3, $5, nullptr ) ); }
1066	\| IF '(' if_control_expression ')' statement ELSE statement
1067	{ $$ = new StatementNode( build_if( $3, $5, $7 ) ); }
1068	;
1069
1070	if_control_expression:
1071	comma_expression
1072	{ $$ = new IfCtrl( nullptr, $1 ); }
1073	\| c_declaration // no semi-colon
1074	{ $$ = new IfCtrl( $1, nullptr ); }
1075	\| cfa_declaration // no semi-colon
1076	{ $$ = new IfCtrl( $1, nullptr ); }
1077	\| declaration comma_expression // semi-colon separated
1078	{ $$ = new IfCtrl( $1, $2 ); }
1079	;
1080
1081	// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
1082	// clause allows a list of values and subranges.
1083
1084	case_value: // CFA
1085	constant_expression { $$ = $1; }
1086	\| constant_expression ELLIPSIS constant_expression // GCC, subrange
1087	{ $$ = new ExpressionNode( new RangeExpr( maybeMoveBuild< Expression >( $1 ), maybeMoveBuild< Expression >( $3 ) ) ); }
1088	\| subrange // CFA, subrange
1089	;
1090
1091	case_value_list: // CFA
1092	case_value { $$ = new StatementNode( build_case( $1 ) ); }
1093	// convert case list, e.g., "case 1, 3, 5:" into "case 1: case 3: case 5"
1094	\| case_value_list ',' case_value { $$ = (StatementNode *)($1->set_last( new StatementNode( build_case( $3 ) ) ) ); }
1095	;
1096
1097	case_label: // CFA
1098	CASE case_value_list ':' { $$ = $2; }
1099	\| DEFAULT ':' { $$ = new StatementNode( build_default() ); }
1100	// A semantic check is required to ensure only one default clause per switch/choose statement.
1101	;
1102
1103	//label_list_opt:
1104	// // empty
1105	// \| identifier_or_type_name ':'
1106	// \| label_list_opt identifier_or_type_name ':'
1107	// ;
1108
1109	case_label_list: // CFA
1110	case_label
1111	\| case_label_list case_label { $$ = (StatementNode *)( $1->set_last( $2 )); }
1112	;
1113
1114	case_clause: // CFA
1115	case_label_list statement { $$ = $1->append_last_case( new StatementNode( build_compound( $2 ) ) ); }
1116	;
1117
1118	switch_clause_list_opt: // CFA
1119	// empty
1120	{ $$ = nullptr; }
1121	\| switch_clause_list
1122	;
1123
1124	switch_clause_list: // CFA
1125	case_label_list statement_list_nodecl
1126	{ $$ = $1->append_last_case( new StatementNode( build_compound( $2 ) ) ); }
1127	\| switch_clause_list case_label_list statement_list_nodecl
1128	{ $$ = (StatementNode *)( $1->set_last( $2->append_last_case( new StatementNode( build_compound( $3 ) ) ) ) ); }
1129	;
1130
1131	iteration_statement:
1132	WHILE '(' push if_control_expression ')' statement pop
1133	{ $$ = new StatementNode( build_while( $4, $6 ) ); }
1134	\| WHILE '(' ')' statement // CFA => while ( 1 )
1135	{ $$ = new StatementNode( build_while( new IfCtrl( nullptr, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ), $4 ) ); }
1136	\| DO statement WHILE '(' comma_expression ')' ';'
1137	{ $$ = new StatementNode( build_do_while( $5, $2 ) ); }
1138	\| DO statement WHILE '(' ')' ';' // CFA => do while( 1 )
1139	{ $$ = new StatementNode( build_do_while( new ExpressionNode( build_constantInteger( *new string( "1" ) ) ), $2 ) ); }
1140	\| FOR '(' push for_control_expression ')' statement pop
1141	{ $$ = new StatementNode( build_for( $4, $6 ) ); }
1142	\| FOR '(' ')' statement // CFA => for ( ;; )
1143	{ $$ = new StatementNode( build_for( new ForCtrl( (ExpressionNode * )nullptr, (ExpressionNode * )nullptr, (ExpressionNode * )nullptr ), $4 ) ); }
1144	;
1145
1146	for_control_expression:
1147	comma_expression // CFA
1148	{ $$ = forCtrl( $1, new string( DeclarationNode::anonymous.newName() ), new ExpressionNode( build_constantInteger( *new string( "0" ) ) ),
1149	OperKinds::LThan, $1->clone(), new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1150	\| constant_expression inclexcl constant_expression // CFA
1151	{ $$ = forCtrl( $1, new string( DeclarationNode::anonymous.newName() ), $1->clone(), $2, $3, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1152	\| constant_expression inclexcl constant_expression '~' constant_expression // CFA
1153	{ $$ = forCtrl( $1, new string( DeclarationNode::anonymous.newName() ), $1->clone(), $2, $3, $5 ); }
1154	\| comma_expression ';' comma_expression // CFA
1155	{ $$ = forCtrl( $3, $1, new ExpressionNode( build_constantInteger( *new string( "0" ) ) ),
1156	OperKinds::LThan, $3->clone(), new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1157	\| comma_expression ';' constant_expression inclexcl constant_expression // CFA
1158	{ $$ = forCtrl( $3, $1, $3->clone(), $4, $5, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1159	\| comma_expression ';' constant_expression inclexcl constant_expression '~' constant_expression // CFA
1160	{ $$ = forCtrl( $3, $1, $3->clone(), $4, $5, $7 ); }
1161	\| comma_expression ';' comma_expression_opt ';' comma_expression_opt
1162	{ $$ = new ForCtrl( $1, $3, $5 ); }
1163	\| ';' comma_expression_opt ';' comma_expression_opt
1164	{ $$ = new ForCtrl( (ExpressionNode * )nullptr, $2, $4 ); }
1165	\| declaration comma_expression_opt ';' comma_expression_opt // C99, declaration has ';'
1166	{ $$ = new ForCtrl( $1, $2, $4 ); }
1167	;
1168
1169	inclexcl:
1170	'~'
1171	{ $$ = OperKinds::LThan; }
1172	\| ErangeUpEq
1173	{ $$ = OperKinds::LEThan; }
1174	\| ErangeDown
1175	{ $$ = OperKinds::GThan; }
1176	\| ErangeDownEq
1177	{ $$ = OperKinds::GEThan; }
1178	;
1179
1180	jump_statement:
1181	GOTO identifier_or_type_name ';'
1182	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Goto ) ); }
1183	\| GOTO '*' comma_expression ';' // GCC, computed goto
1184	// The syntax for the GCC computed goto violates normal expression precedence, e.g., goto i+3; => goto (i+3);
1185	// whereas normal operator precedence yields goto (*i)+3;
1186	{ $$ = new StatementNode( build_computedgoto( $3 ) ); }
1187	// A semantic check is required to ensure fallthru appears only in the body of a choose statement.
1188	\| fall_through_name ';' // CFA
1189	{ $$ = new StatementNode( build_branch( BranchStmt::FallThrough ) ); }
1190	\| fall_through_name identifier_or_type_name ';' // CFA
1191	{ $$ = new StatementNode( build_branch( $2, BranchStmt::FallThrough ) ); }
1192	\| fall_through_name DEFAULT ';' // CFA
1193	{ $$ = new StatementNode( build_branch( BranchStmt::FallThroughDefault ) ); }
1194	\| CONTINUE ';'
1195	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1196	{ $$ = new StatementNode( build_branch( BranchStmt::Continue ) ); }
1197	\| CONTINUE identifier_or_type_name ';' // CFA, multi-level continue
1198	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1199	// the target of the transfer appears only at the start of an iteration statement.
1200	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Continue ) ); }
1201	\| BREAK ';'
1202	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1203	{ $$ = new StatementNode( build_branch( BranchStmt::Break ) ); }
1204	\| BREAK identifier_or_type_name ';' // CFA, multi-level exit
1205	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1206	// the target of the transfer appears only at the start of an iteration statement.
1207	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Break ) ); }
1208	\| RETURN comma_expression_opt ';'
1209	{ $$ = new StatementNode( build_return( $2 ) ); }
1210	\| RETURN '{' initializer_list_opt comma_opt '}'
1211	{ SemanticError( yylloc, "Initializer return is currently unimplemented." ); $$ = nullptr; }
1212	\| THROW assignment_expression_opt ';' // handles rethrow
1213	{ $$ = new StatementNode( build_throw( $2 ) ); }
1214	\| THROWRESUME assignment_expression_opt ';' // handles reresume
1215	{ $$ = new StatementNode( build_resume( $2 ) ); }
1216	\| THROWRESUME assignment_expression_opt AT assignment_expression ';' // handles reresume
1217	{ $$ = new StatementNode( build_resume_at( $2, $4 ) ); }
1218	;
1219
1220	fall_through_name: // CFA
1221	FALLTHRU
1222	\| FALLTHROUGH
1223	;
1224
1225	with_statement:
1226	WITH '(' tuple_expression_list ')' statement
1227	{
1228	$$ = new StatementNode( build_with( $3, $5 ) );
1229	}
1230	;
1231
1232	// If MUTEX becomes a general qualifier, there are shift/reduce conflicts, so change syntax to "with mutex".
1233	mutex_statement:
1234	MUTEX '(' argument_expression_list ')' statement
1235	{ SemanticError( yylloc, "Mutex statement is currently unimplemented." ); $$ = nullptr; }
1236	;
1237
1238	when_clause:
1239	WHEN '(' comma_expression ')' { $$ = $3; }
1240	;
1241
1242	when_clause_opt:
1243	// empty
1244	{ $$ = nullptr; }
1245	\| when_clause
1246	;
1247
1248	waitfor:
1249	WAITFOR '(' cast_expression ')'
1250	{ $$ = $3; }
1251	\| WAITFOR '(' cast_expression ',' argument_expression_list ')'
1252	{ $$ = (ExpressionNode *)$3->set_last( $5 ); }
1253	;
1254
1255	timeout:
1256	TIMEOUT '(' comma_expression ')' { $$ = $3; }
1257	;
1258
1259	waitfor_clause:
1260	when_clause_opt waitfor statement %prec THEN
1261	{ $$ = build_waitfor( $2, $3, $1 ); }
1262	\| when_clause_opt waitfor statement WOR waitfor_clause
1263	{ $$ = build_waitfor( $2, $3, $1, $5 ); }
1264	\| when_clause_opt timeout statement %prec THEN
1265	{ $$ = build_waitfor_timeout( $2, $3, $1 ); }
1266	\| when_clause_opt ELSE statement
1267	{ $$ = build_waitfor_timeout( nullptr, $3, $1 ); }
1268	// "else" must be conditional after timeout or timeout is never triggered (i.e., it is meaningless)
1269	\| when_clause_opt timeout statement WOR ELSE statement
1270	{ SemanticError( yylloc, "else clause must be conditional after timeout or timeout never triggered." ); $$ = nullptr; }
1271	\| when_clause_opt timeout statement WOR when_clause ELSE statement
1272	{ $$ = build_waitfor_timeout( $2, $3, $1, $7, $5 ); }
1273	;
1274
1275	waitfor_statement:
1276	when_clause_opt waitfor statement %prec THEN
1277	{ $$ = new StatementNode( build_waitfor( $2, $3, $1 ) ); }
1278	\| when_clause_opt waitfor statement WOR waitfor_clause
1279	{ $$ = new StatementNode( build_waitfor( $2, $3, $1, $5 ) ); }
1280	;
1281
1282	exception_statement:
1283	TRY compound_statement handler_clause
1284	{ $$ = new StatementNode( build_try( $2, $3, 0 ) ); }
1285	\| TRY compound_statement finally_clause
1286	{ $$ = new StatementNode( build_try( $2, 0, $3 ) ); }
1287	\| TRY compound_statement handler_clause finally_clause
1288	{ $$ = new StatementNode( build_try( $2, $3, $4 ) ); }
1289	;
1290
1291	handler_clause:
1292	handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement pop
1293	{ $$ = new StatementNode( build_catch( $1, $4, $6, $8 ) ); }
1294	\| handler_clause handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement pop
1295	{ $$ = (StatementNode *)$1->set_last( new StatementNode( build_catch( $2, $5, $7, $9 ) ) ); }
1296	;
1297
1298	handler_predicate_opt:
1299	// empty
1300	{ $$ = nullptr; }
1301	\| ';' conditional_expression { $$ = $2; }
1302	;
1303
1304	handler_key:
1305	CATCH { $$ = CatchStmt::Terminate; }
1306	\| CATCHRESUME { $$ = CatchStmt::Resume; }
1307	;
1308
1309	finally_clause:
1310	FINALLY compound_statement { $$ = new StatementNode( build_finally( $2 ) ); }
1311	;
1312
1313	exception_declaration:
1314	// No SUE declaration in parameter list.
1315	type_specifier_nobody
1316	\| type_specifier_nobody declarator
1317	{ $$ = $2->addType( $1 ); }
1318	\| type_specifier_nobody variable_abstract_declarator
1319	{ $$ = $2->addType( $1 ); }
1320	\| cfa_abstract_declarator_tuple no_attr_identifier // CFA
1321	{ $$ = $1->addName( $2 ); }
1322	\| cfa_abstract_declarator_tuple // CFA
1323	;
1324
1325	enable_disable_statement:
1326	enable_disable_key identifier_list compound_statement
1327	;
1328
1329	enable_disable_key:
1330	ENABLE
1331	\| DISABLE
1332	;
1333
1334	asm_statement:
1335	ASM asm_volatile_opt '(' string_literal ')' ';'
1336	{ $$ = new StatementNode( build_asm( $2, $4, 0 ) ); }
1337	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ')' ';' // remaining GCC
1338	{ $$ = new StatementNode( build_asm( $2, $4, $6 ) ); }
1339	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ')' ';'
1340	{ $$ = new StatementNode( build_asm( $2, $4, $6, $8 ) ); }
1341	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
1342	{ $$ = new StatementNode( build_asm( $2, $4, $6, $8, $10 ) ); }
1343	\| ASM asm_volatile_opt GOTO '(' string_literal ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
1344	{ $$ = new StatementNode( build_asm( $2, $5, 0, $8, $10, $12 ) ); }
1345	;
1346
1347	asm_volatile_opt: // GCC
1348	// empty
1349	{ $$ = false; }
1350	\| VOLATILE
1351	{ $$ = true; }
1352	;
1353
1354	asm_operands_opt: // GCC
1355	// empty
1356	{ $$ = nullptr; } // use default argument
1357	\| asm_operands_list
1358	;
1359
1360	asm_operands_list: // GCC
1361	asm_operand
1362	\| asm_operands_list ',' asm_operand
1363	{ $$ = (ExpressionNode *)$1->set_last( $3 ); }
1364	;
1365
1366	asm_operand: // GCC
1367	string_literal '(' constant_expression ')'
1368	{ $$ = new ExpressionNode( new AsmExpr( maybeMoveBuild< Expression >( (ExpressionNode *)nullptr ), $1, maybeMoveBuild< Expression >( $3 ) ) ); }
1369	\| '[' constant_expression ']' string_literal '(' constant_expression ')'
1370	{ $$ = new ExpressionNode( new AsmExpr( maybeMoveBuild< Expression >( $2 ), $4, maybeMoveBuild< Expression >( $6 ) ) ); }
1371	;
1372
1373	asm_clobbers_list_opt: // GCC
1374	// empty
1375	{ $$ = nullptr; } // use default argument
1376	\| string_literal
1377	{ $$ = new ExpressionNode( $1 ); }
1378	\| asm_clobbers_list_opt ',' string_literal
1379	// set_last returns ParseNode *
1380	{ $$ = (ExpressionNode *)$1->set_last( new ExpressionNode( $3 ) ); }
1381	;
1382
1383	label_list:
1384	no_attr_identifier
1385	{
1386	$$ = new LabelNode(); $$->labels.push_back( *$1 );
1387	delete $1; // allocated by lexer
1388	}
1389	\| label_list ',' no_attr_identifier
1390	{
1391	$$ = $1; $1->labels.push_back( *$3 );
1392	delete $3; // allocated by lexer
1393	}
1394	;
1395
1396	//***************************** DECLARATIONS *******************************
1397
1398	declaration_list_opt: // used at beginning of switch statement
1399	// empty
1400	{ $$ = nullptr; }
1401	\| declaration_list
1402	;
1403
1404	declaration_list:
1405	declaration
1406	\| declaration_list declaration
1407	{ $$ = $1->appendList( $2 ); }
1408	;
1409
1410	KR_parameter_list_opt: // used to declare parameter types in K&R style functions
1411	// empty
1412	{ $$ = nullptr; }
1413	\| KR_parameter_list
1414	;
1415
1416	KR_parameter_list:
1417	push c_declaration pop ';'
1418	{ $$ = $2; }
1419	\| KR_parameter_list push c_declaration pop ';'
1420	{ $$ = $1->appendList( $3 ); }
1421	;
1422
1423	local_label_declaration_opt: // GCC, local label
1424	// empty
1425	\| local_label_declaration_list
1426	;
1427
1428	local_label_declaration_list: // GCC, local label
1429	LABEL local_label_list ';'
1430	\| local_label_declaration_list LABEL local_label_list ';'
1431	;
1432
1433	local_label_list: // GCC, local label
1434	no_attr_identifier_or_type_name
1435	\| local_label_list ',' no_attr_identifier_or_type_name
1436	;
1437
1438	declaration: // old & new style declarations
1439	c_declaration ';'
1440	\| cfa_declaration ';' // CFA
1441	\| static_assert // C11
1442	;
1443
1444	static_assert:
1445	STATICASSERT '(' constant_expression ',' string_literal ')' ';' // C11
1446	{ $$ = DeclarationNode::newStaticAssert( $3, $5 ); }
1447	\| STATICASSERT '(' constant_expression ')' ';' // CFA
1448	{ $$ = DeclarationNode::newStaticAssert( $3, build_constantStr( *new string( "\"\"" ) ) ); }
1449
1450	// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
1451	// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
1452	// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
1453	// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
1454	// the declaration list (as in Pascal). ANSI C and the new CFA declarations may appear together in the same program
1455	// block, but cannot be mixed within a specific declaration.
1456	//
1457	// CFA C
1458	// [10] int x; int x[10]; // array of 10 integers
1459	// [10] * char y; char *y[10]; // array of 10 pointers to char
1460
1461	cfa_declaration: // CFA
1462	cfa_variable_declaration
1463	\| cfa_typedef_declaration
1464	\| cfa_function_declaration
1465	\| type_declaring_list
1466	\| trait_specifier
1467	;
1468
1469	cfa_variable_declaration: // CFA
1470	cfa_variable_specifier initializer_opt
1471	{ $$ = $1->addInitializer( $2 ); }
1472	\| declaration_qualifier_list cfa_variable_specifier initializer_opt
1473	// declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
1474	// them as a type_qualifier cannot appear in that context.
1475	{ $$ = $2->addQualifiers( $1 )->addInitializer( $3 ); }
1476	\| cfa_variable_declaration pop ',' push identifier_or_type_name initializer_opt
1477	{ $$ = $1->appendList( $1->cloneType( $5 )->addInitializer( $6 ) ); }
1478	;
1479
1480	cfa_variable_specifier: // CFA
1481	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1482	// storage-class
1483	cfa_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
1484	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
1485	\| cfa_abstract_tuple identifier_or_type_name asm_name_opt
1486	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
1487	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name asm_name_opt
1488	{ $$ = $2->addQualifiers( $1 )->addName( $3 )->addAsmName( $4 ); }
1489	;
1490
1491	cfa_function_declaration: // CFA
1492	cfa_function_specifier
1493	\| type_qualifier_list cfa_function_specifier
1494	{ $$ = $2->addQualifiers( $1 ); }
1495	\| declaration_qualifier_list cfa_function_specifier
1496	{ $$ = $2->addQualifiers( $1 ); }
1497	\| declaration_qualifier_list type_qualifier_list cfa_function_specifier
1498	{ $$ = $3->addQualifiers( $1 )->addQualifiers( $2 ); }
1499	\| cfa_function_declaration ',' identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')'
1500	{
1501	// Append the return type at the start (left-hand-side) to each identifier in the list.
1502	DeclarationNode * ret = new DeclarationNode;
1503	ret->type = maybeClone( $1->type->base );
1504	$$ = $1->appendList( DeclarationNode::newFunction( $3, ret, $6, nullptr ) );
1505	}
1506	;
1507
1508	cfa_function_specifier: // CFA
1509	// '[' ']' identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')' // S/R conflict
1510	// {
1511	// $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( 0 ), $6, 0, true );
1512	// }
1513	// '[' ']' identifier '(' push cfa_parameter_ellipsis_list_opt pop ')'
1514	// {
1515	// typedefTable.setNextIdentifier( *$5 );
1516	// $$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
1517	// }
1518	// \| '[' ']' TYPEDEFname '(' push cfa_parameter_ellipsis_list_opt pop ')'
1519	// {
1520	// typedefTable.setNextIdentifier( *$5 );
1521	// $$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
1522	// }
1523	// \| '[' ']' typegen_name
1524	// identifier_or_type_name must be broken apart because of the sequence:
1525	//
1526	// '[' ']' identifier_or_type_name '(' cfa_parameter_ellipsis_list_opt ')'
1527	// '[' ']' type_specifier
1528	//
1529	// type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
1530	// flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
1531	cfa_abstract_tuple identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')'
1532	// To obtain LR(1 ), this rule must be factored out from function return type (see cfa_abstract_declarator).
1533	{ $$ = DeclarationNode::newFunction( $2, $1, $5, 0 ); }
1534	\| cfa_function_return identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')'
1535	{ $$ = DeclarationNode::newFunction( $2, $1, $5, 0 ); }
1536	;
1537
1538	cfa_function_return: // CFA
1539	'[' push cfa_parameter_list pop ']'
1540	{ $$ = DeclarationNode::newTuple( $3 ); }
1541	\| '[' push cfa_parameter_list pop ',' push cfa_abstract_parameter_list pop ']'
1542	// To obtain LR(1 ), the last cfa_abstract_parameter_list is added into this flattened rule to lookahead to the ']'.
1543	{ $$ = DeclarationNode::newTuple( $3->appendList( $7 ) ); }
1544	;
1545
1546	cfa_typedef_declaration: // CFA
1547	TYPEDEF cfa_variable_specifier
1548	{
1549	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "1" );
1550	$$ = $2->addTypedef();
1551	}
1552	\| TYPEDEF cfa_function_specifier
1553	{
1554	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "2" );
1555	$$ = $2->addTypedef();
1556	}
1557	\| cfa_typedef_declaration pop ',' push no_attr_identifier
1558	{
1559	typedefTable.addToEnclosingScope( *$5, TYPEDEFname, "3" );
1560	$$ = $1->appendList( $1->cloneType( $5 ) );
1561	}
1562	;
1563
1564	// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
1565	// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.
1566
1567	typedef_declaration:
1568	TYPEDEF type_specifier declarator
1569	{
1570	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "4" );
1571	$$ = $3->addType( $2 )->addTypedef();
1572	}
1573	\| typedef_declaration pop ',' push declarator
1574	{
1575	typedefTable.addToEnclosingScope( *$5->name, TYPEDEFname, "5" );
1576	$$ = $1->appendList( $1->cloneBaseType( $5 )->addTypedef() );
1577	}
1578	\| type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
1579	{
1580	typedefTable.addToEnclosingScope( *$4->name, TYPEDEFname, "6" );
1581	$$ = $4->addType( $3 )->addQualifiers( $1 )->addTypedef();
1582	}
1583	\| type_specifier TYPEDEF declarator
1584	{
1585	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "7" );
1586	$$ = $3->addType( $1 )->addTypedef();
1587	}
1588	\| type_specifier TYPEDEF type_qualifier_list declarator
1589	{
1590	typedefTable.addToEnclosingScope( *$4->name, TYPEDEFname, "8" );
1591	$$ = $4->addQualifiers( $1 )->addTypedef()->addType( $1 );
1592	}
1593	;
1594
1595	typedef_expression:
1596	// GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
1597	TYPEDEF no_attr_identifier '=' assignment_expression
1598	{
1599	// $$ = DeclarationNode::newName( 0 ); // unimplemented
1600	SemanticError( yylloc, "Typedef expression is currently unimplemented." ); $$ = nullptr;
1601	}
1602	\| typedef_expression pop ',' push no_attr_identifier '=' assignment_expression
1603	{
1604	// $$ = DeclarationNode::newName( 0 ); // unimplemented
1605	SemanticError( yylloc, "Typedef expression is currently unimplemented." ); $$ = nullptr;
1606	}
1607	;
1608
1609	//c_declaration:
1610	// declaring_list pop ';'
1611	// \| typedef_declaration pop ';'
1612	// \| typedef_expression pop ';' // GCC, naming expression type
1613	// \| sue_declaration_specifier pop ';'
1614	// ;
1615	//
1616	//declaring_list:
1617	// // A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1618	// // storage-class
1619	// declarator asm_name_opt initializer_opt
1620	// {
1621	// typedefTable.addToEnclosingScope( IDENTIFIER );
1622	// $$ = ( $2->addType( $1 ))->addAsmName( $3 )->addInitializer( $4 );
1623	// }
1624	// \| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
1625	// {
1626	// typedefTable.addToEnclosingScope( IDENTIFIER );
1627	// $$ = $1->appendList( $1->cloneBaseType( $4->addAsmName( $5 )->addInitializer( $6 ) ) );
1628	// }
1629	// ;
1630
1631	c_declaration:
1632	declaration_specifier declaring_list
1633	{ $$ = distAttr( $1, $2 ); }
1634	\| typedef_declaration
1635	\| typedef_expression // GCC, naming expression type
1636	\| sue_declaration_specifier
1637	;
1638
1639	declaring_list:
1640	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1641	// storage-class
1642	declarator asm_name_opt initializer_opt
1643	{ $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
1644	\| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
1645	{ $$ = $1->appendList( $4->addQualifiers( $3 )->addAsmName( $5 )->addInitializer( $6 ) ); }
1646	;
1647
1648	declaration_specifier: // type specifier + storage class
1649	basic_declaration_specifier
1650	\| sue_declaration_specifier
1651	\| type_declaration_specifier
1652	;
1653
1654	declaration_specifier_nobody: // type specifier + storage class - {...}
1655	// Preclude SUE declarations in restricted scopes:
1656	//
1657	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
1658	//
1659	// because it is impossible to call f due to name equivalence.
1660	basic_declaration_specifier
1661	\| sue_declaration_specifier_nobody
1662	\| type_declaration_specifier
1663	;
1664
1665	type_specifier: // type specifier
1666	basic_type_specifier
1667	\| sue_type_specifier
1668	\| type_type_specifier
1669	;
1670
1671	type_specifier_nobody: // type specifier - {...}
1672	// Preclude SUE declarations in restricted scopes:
1673	//
1674	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
1675	//
1676	// because it is impossible to call f due to name equivalence.
1677	basic_type_specifier
1678	\| sue_type_specifier_nobody
1679	\| type_type_specifier
1680	;
1681
1682	type_qualifier_list_opt: // GCC, used in asm_statement
1683	// empty
1684	{ $$ = nullptr; }
1685	\| type_qualifier_list
1686	;
1687
1688	type_qualifier_list:
1689	// A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
1690	//
1691	// ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
1692	// specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
1693	// appeared only once.
1694	type_qualifier
1695	\| type_qualifier_list type_qualifier
1696	{ $$ = $1->addQualifiers( $2 ); }
1697	;
1698
1699	type_qualifier:
1700	type_qualifier_name
1701	\| attribute
1702	;
1703
1704	type_qualifier_name:
1705	CONST
1706	{ $$ = DeclarationNode::newTypeQualifier( Type::Const ); }
1707	\| RESTRICT
1708	{ $$ = DeclarationNode::newTypeQualifier( Type::Restrict ); }
1709	\| VOLATILE
1710	{ $$ = DeclarationNode::newTypeQualifier( Type::Volatile ); }
1711	\| ATOMIC
1712	{ $$ = DeclarationNode::newTypeQualifier( Type::Atomic ); }
1713	\| forall
1714	;
1715
1716	forall:
1717	FORALL '(' type_parameter_list ')' // CFA
1718	{ $$ = DeclarationNode::newForall( $3 ); }
1719	;
1720
1721	declaration_qualifier_list:
1722	storage_class_list
1723	\| type_qualifier_list storage_class_list // remaining OBSOLESCENT (see 2 )
1724	{ $$ = $1->addQualifiers( $2 ); }
1725	\| declaration_qualifier_list type_qualifier_list storage_class_list
1726	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1727	;
1728
1729	storage_class_list:
1730	// A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
1731	// only one of each is specified, except for inline, which can appear with the others.
1732	//
1733	// ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
1734	// specifiers in a declaration.
1735	storage_class
1736	\| storage_class_list storage_class
1737	{ $$ = $1->addQualifiers( $2 ); }
1738	;
1739
1740	storage_class:
1741	EXTERN
1742	{ $$ = DeclarationNode::newStorageClass( Type::Extern ); }
1743	\| STATIC
1744	{ $$ = DeclarationNode::newStorageClass( Type::Static ); }
1745	\| AUTO
1746	{ $$ = DeclarationNode::newStorageClass( Type::Auto ); }
1747	\| REGISTER
1748	{ $$ = DeclarationNode::newStorageClass( Type::Register ); }
1749	\| THREADLOCAL // C11
1750	{ $$ = DeclarationNode::newStorageClass( Type::Threadlocal ); }
1751	// Put function specifiers here to simplify parsing rules, but separate them semantically.
1752	\| INLINE // C99
1753	{ $$ = DeclarationNode::newFuncSpecifier( Type::Inline ); }
1754	\| FORTRAN // C99
1755	{ $$ = DeclarationNode::newFuncSpecifier( Type::Fortran ); }
1756	\| NORETURN // C11
1757	{ $$ = DeclarationNode::newFuncSpecifier( Type::Noreturn ); }
1758	;
1759
1760	basic_type_name:
1761	VOID
1762	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
1763	\| BOOL // C99
1764	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Bool ); }
1765	\| CHAR
1766	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Char ); }
1767	\| INT
1768	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int ); }
1769	\| INT128
1770	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int128 ); }
1771	\| FLOAT
1772	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float ); }
1773	\| FLOAT80
1774	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float80 ); }
1775	\| FLOAT128
1776	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float128 ); }
1777	\| DOUBLE
1778	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Double ); }
1779	\| COMPLEX // C99
1780	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Complex ); }
1781	\| IMAGINARY // C99
1782	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Imaginary ); }
1783	\| SIGNED
1784	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Signed ); }
1785	\| UNSIGNED
1786	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Unsigned ); }
1787	\| SHORT
1788	{ $$ = DeclarationNode::newLength( DeclarationNode::Short ); }
1789	\| LONG
1790	{ $$ = DeclarationNode::newLength( DeclarationNode::Long ); }
1791	\| VALIST // GCC, __builtin_va_list
1792	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Valist ); }
1793	;
1794
1795	basic_declaration_specifier:
1796	// A semantic check is necessary for conflicting storage classes.
1797	basic_type_specifier
1798	\| declaration_qualifier_list basic_type_specifier
1799	{ $$ = $2->addQualifiers( $1 ); }
1800	\| basic_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1801	{ $$ = $1->addQualifiers( $2 ); }
1802	\| basic_declaration_specifier storage_class type_qualifier_list
1803	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1804	\| basic_declaration_specifier storage_class basic_type_specifier
1805	{ $$ = $3->addQualifiers( $2 )->addType( $1 ); }
1806	;
1807
1808	basic_type_specifier:
1809	direct_type
1810	// Cannot have type modifiers, e.g., short, long, etc.
1811	\| type_qualifier_list_opt indirect_type type_qualifier_list_opt
1812	{ $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
1813	;
1814
1815	direct_type:
1816	basic_type_name
1817	\| type_qualifier_list basic_type_name
1818	{ $$ = $2->addQualifiers( $1 ); }
1819	\| direct_type type_qualifier
1820	{ $$ = $1->addQualifiers( $2 ); }
1821	\| direct_type basic_type_name
1822	{ $$ = $1->addType( $2 ); }
1823	;
1824
1825	indirect_type:
1826	TYPEOF '(' type ')' // GCC: typeof( x ) y;
1827	{ $$ = $3; }
1828	\| TYPEOF '(' comma_expression ')' // GCC: typeof( a+b ) y;
1829	{ $$ = DeclarationNode::newTypeof( $3 ); }
1830	\| BASETYPEOF '(' type ')' // CFA: basetypeof( x ) y;
1831	{ $$ = DeclarationNode::newTypeof( new ExpressionNode( new TypeExpr( maybeMoveBuildType( $3 ) ) ), true ); }
1832	\| BASETYPEOF '(' comma_expression ')' // CFA: basetypeof( a+b ) y;
1833	{ $$ = DeclarationNode::newTypeof( $3, true ); }
1834	\| ATTR_TYPEGENname '(' type ')' // CFA: e.g., @type( x ) y;
1835	{ $$ = DeclarationNode::newAttr( $1, $3 ); }
1836	\| ATTR_TYPEGENname '(' comma_expression ')' // CFA: e.g., @type( a+b ) y;
1837	{ $$ = DeclarationNode::newAttr( $1, $3 ); }
1838	\| ZERO_T // CFA
1839	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Zero ); }
1840	\| ONE_T // CFA
1841	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::One ); }
1842	;
1843
1844	sue_declaration_specifier: // struct, union, enum + storage class + type specifier
1845	sue_type_specifier
1846	\| declaration_qualifier_list sue_type_specifier
1847	{ $$ = $2->addQualifiers( $1 ); }
1848	\| sue_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1849	{ $$ = $1->addQualifiers( $2 ); }
1850	\| sue_declaration_specifier storage_class type_qualifier_list
1851	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1852	;
1853
1854	sue_type_specifier: // struct, union, enum + type specifier
1855	elaborated_type
1856	\| type_qualifier_list
1857	{ if ( $1->type != nullptr && $1->type->forall ) forall = true; } // remember generic type
1858	elaborated_type
1859	{ $$ = $3->addQualifiers( $1 ); }
1860	\| sue_type_specifier type_qualifier
1861	{
1862	if ( $2->type != nullptr && $2->type->forall ) forall = true; // remember generic type
1863	$$ = $1->addQualifiers( $2 );
1864	}
1865	;
1866
1867	sue_declaration_specifier_nobody: // struct, union, enum - {...} + storage class + type specifier
1868	sue_type_specifier_nobody
1869	\| declaration_qualifier_list sue_type_specifier_nobody
1870	{ $$ = $2->addQualifiers( $1 ); }
1871	\| sue_declaration_specifier_nobody storage_class // remaining OBSOLESCENT (see 2)
1872	{ $$ = $1->addQualifiers( $2 ); }
1873	\| sue_declaration_specifier_nobody storage_class type_qualifier_list
1874	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1875	;
1876
1877	sue_type_specifier_nobody: // struct, union, enum - {...} + type specifier
1878	elaborated_type_nobody
1879	\| type_qualifier_list elaborated_type_nobody
1880	{ $$ = $2->addQualifiers( $1 ); }
1881	\| sue_type_specifier_nobody type_qualifier
1882	{ $$ = $1->addQualifiers( $2 ); }
1883	;
1884
1885	type_declaration_specifier:
1886	type_type_specifier
1887	\| declaration_qualifier_list type_type_specifier
1888	{ $$ = $2->addQualifiers( $1 ); }
1889	\| type_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1890	{ $$ = $1->addQualifiers( $2 ); }
1891	\| type_declaration_specifier storage_class type_qualifier_list
1892	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1893	;
1894
1895	type_type_specifier: // typedef types
1896	type_name
1897	\| type_qualifier_list type_name
1898	{ $$ = $2->addQualifiers( $1 ); }
1899	\| type_type_specifier type_qualifier
1900	{ $$ = $1->addQualifiers( $2 ); }
1901	;
1902
1903	type_name:
1904	TYPEDEFname
1905	{ $$ = DeclarationNode::newFromTypedef( $1 ); }
1906	\| '.' TYPEDEFname
1907	{ $$ = DeclarationNode::newQualifiedType( DeclarationNode::newFromGlobalScope(), DeclarationNode::newFromTypedef( $2 ) ); }
1908	\| type_name '.' TYPEDEFname
1909	{ $$ = DeclarationNode::newQualifiedType( $1, DeclarationNode::newFromTypedef( $3 ) ); }
1910	\| typegen_name
1911	\| '.' typegen_name
1912	{ $$ = DeclarationNode::newQualifiedType( DeclarationNode::newFromGlobalScope(), $2 ); }
1913	\| type_name '.' typegen_name
1914	{ $$ = DeclarationNode::newQualifiedType( $1, $3 ); }
1915	;
1916
1917	typegen_name: // CFA
1918	TYPEGENname
1919	{ $$ = DeclarationNode::newFromTypeGen( $1, nullptr ); }
1920	\| TYPEGENname '(' ')'
1921	{ $$ = DeclarationNode::newFromTypeGen( $1, nullptr ); }
1922	\| TYPEGENname '(' type_list ')'
1923	{ $$ = DeclarationNode::newFromTypeGen( $1, $3 ); }
1924	;
1925
1926	elaborated_type: // struct, union, enum
1927	aggregate_type
1928	\| enum_type
1929	;
1930
1931	elaborated_type_nobody: // struct, union, enum - {...}
1932	aggregate_type_nobody
1933	\| enum_type_nobody
1934	;
1935
1936	fred:
1937	// empty
1938	{ yyy = false; }
1939	;
1940
1941	aggregate_type: // struct, union
1942	aggregate_key attribute_list_opt
1943	{ forall = false; } // reset
1944	'{' field_declaration_list_opt '}' type_parameters_opt
1945	{ $$ = DeclarationNode::newAggregate( $1, nullptr, $7, $5, true )->addQualifiers( $2 ); }
1946	\| aggregate_key attribute_list_opt no_attr_identifier fred
1947	{
1948	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname ); // create typedef
1949	forall = false; // reset
1950	}
1951	'{' field_declaration_list_opt '}' type_parameters_opt
1952	{ $$ = DeclarationNode::newAggregate( $1, $3, $9, $7, true )->addQualifiers( $2 ); }
1953	\| aggregate_key attribute_list_opt type_name fred
1954	{
1955	// for type_name can be a qualified type name S.T, in which case only the last name in the chain needs a typedef (other names in the chain should already have one)
1956	typedefTable.makeTypedef( *$3->type->leafName(), forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname ); // create typedef
1957	forall = false; // reset
1958	}
1959	'{' field_declaration_list_opt '}' type_parameters_opt
1960	{ $$ = DeclarationNode::newAggregate( $1, $3->type->symbolic.name, $9, $7, true )->addQualifiers( $2 ); }
1961	\| aggregate_type_nobody
1962	;
1963
1964	type_parameters_opt:
1965	// empty
1966	{ $$ = nullptr; } %prec '}'
1967	\| '(' type_list ')'
1968	{ $$ = $2; }
1969	;
1970
1971	aggregate_type_nobody: // struct, union - {...}
1972	aggregate_key attribute_list_opt no_attr_identifier fred
1973	{
1974	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname );
1975	forall = false; // reset
1976	$$ = DeclarationNode::newAggregate( $1, $3, nullptr, nullptr, false )->addQualifiers( $2 );
1977	}
1978	\| aggregate_key attribute_list_opt type_name fred
1979	{
1980	forall = false; // reset
1981	// Create new generic declaration with same name as previous forward declaration, where the IDENTIFIER is
1982	// switched to a TYPEGENname. Link any generic arguments from typegen_name to new generic declaration and
1983	// delete newFromTypeGen.
1984	$$ = DeclarationNode::newAggregate( $1, $3->type->symbolic.name, $3->type->symbolic.actuals, nullptr, false )->addQualifiers( $2 );
1985	$3->type->symbolic.name = nullptr;
1986	$3->type->symbolic.actuals = nullptr;
1987	delete $3;
1988	}
1989	;
1990
1991	aggregate_key:
1992	STRUCT
1993	{ yyy = true; $$ = DeclarationNode::Struct; }
1994	\| UNION
1995	{ yyy = true; $$ = DeclarationNode::Union; }
1996	\| EXCEPTION
1997	{ yyy = true; $$ = DeclarationNode::Exception; }
1998	\| COROUTINE
1999	{ yyy = true; $$ = DeclarationNode::Coroutine; }
2000	\| MONITOR
2001	{ yyy = true; $$ = DeclarationNode::Monitor; }
2002	\| THREAD
2003	{ yyy = true; $$ = DeclarationNode::Thread; }
2004	;
2005
2006	field_declaration_list_opt:
2007	// empty
2008	{ $$ = nullptr; }
2009	\| field_declaration_list_opt field_declaration
2010	{ $$ = $1 ? $1->appendList( $2 ) : $2; }
2011	;
2012
2013	field_declaration:
2014	type_specifier field_declaring_list_opt ';'
2015	{ $$ = fieldDecl( $1, $2 ); }
2016	\| EXTENSION type_specifier field_declaring_list_opt ';' // GCC
2017	{ $$ = fieldDecl( $2, $3 ); distExt( $$ ); }
2018	\| INLINE type_specifier field_abstract_list_opt ';' // CFA
2019	{
2020	if ( ! $3 ) { // field declarator ?
2021	$3 = DeclarationNode::newName( nullptr );
2022	} // if
2023	$3->inLine = true;
2024	$$ = distAttr( $2, $3 ); // mark all fields in list
2025	distInl( $3 );
2026	}
2027	\| typedef_declaration ';' // CFA
2028	\| cfa_field_declaring_list ';' // CFA, new style field declaration
2029	\| EXTENSION cfa_field_declaring_list ';' // GCC
2030	{ distExt( $2 ); $$ = $2; } // mark all fields in list
2031	\| INLINE cfa_field_abstract_list ';' // CFA, new style field declaration
2032	{ $$ = $2; } // mark all fields in list
2033	\| cfa_typedef_declaration ';' // CFA
2034	\| static_assert // C11
2035	;
2036
2037	field_declaring_list_opt:
2038	// empty
2039	{ $$ = nullptr; }
2040	\| field_declarator
2041	\| field_declaring_list_opt ',' attribute_list_opt field_declarator
2042	{ $$ = $1->appendList( $4->addQualifiers( $3 ) ); }
2043	;
2044
2045	field_declarator:
2046	bit_subrange_size // C special case, no field name
2047	{ $$ = DeclarationNode::newBitfield( $1 ); }
2048	\| variable_declarator bit_subrange_size_opt
2049	// A semantic check is required to ensure bit_subrange only appears on integral types.
2050	{ $$ = $1->addBitfield( $2 ); }
2051	\| variable_type_redeclarator bit_subrange_size_opt
2052	// A semantic check is required to ensure bit_subrange only appears on integral types.
2053	{ $$ = $1->addBitfield( $2 ); }
2054	;
2055
2056	field_abstract_list_opt:
2057	// empty
2058	{ $$ = nullptr; }
2059	\| field_abstract
2060	\| field_abstract_list_opt ',' attribute_list_opt field_abstract
2061	{ $$ = $1->appendList( $4->addQualifiers( $3 ) ); }
2062	;
2063
2064	field_abstract:
2065	// no bit fields
2066	variable_abstract_declarator
2067	;
2068
2069	cfa_field_declaring_list: // CFA, new style field declaration
2070	// bit-fields are handled by C declarations
2071	cfa_abstract_declarator_tuple no_attr_identifier_or_type_name
2072	{ $$ = $1->addName( $2 ); }
2073	\| cfa_field_declaring_list ',' no_attr_identifier_or_type_name
2074	{ $$ = $1->appendList( $1->cloneType( $3 ) ); }
2075	;
2076
2077	cfa_field_abstract_list: // CFA, new style field declaration
2078	// bit-fields are handled by C declarations
2079	cfa_abstract_declarator_tuple
2080	\| cfa_field_abstract_list ','
2081	{ $$ = $1->appendList( $1->cloneType( 0 ) ); }
2082	;
2083
2084	bit_subrange_size_opt:
2085	// empty
2086	{ $$ = nullptr; }
2087	\| bit_subrange_size
2088	;
2089
2090	bit_subrange_size:
2091	':' constant_expression
2092	{ $$ = $2; }
2093	;
2094
2095	enum_type: // enum
2096	ENUM attribute_list_opt '{' enumerator_list comma_opt '}'
2097	{ $$ = DeclarationNode::newEnum( nullptr, $4, true )->addQualifiers( $2 ); }
2098	\| ENUM attribute_list_opt no_attr_identifier
2099	{ typedefTable.makeTypedef( *$3 ); }
2100	'{' enumerator_list comma_opt '}'
2101	{ $$ = DeclarationNode::newEnum( $3, $6, true )->addQualifiers( $2 ); }
2102	\| ENUM attribute_list_opt type_name
2103	'{' enumerator_list comma_opt '}'
2104	{ $$ = DeclarationNode::newEnum( $3->type->symbolic.name, $5, true )->addQualifiers( $2 ); }
2105	\| enum_type_nobody
2106	;
2107
2108	enum_type_nobody: // enum - {...}
2109	ENUM attribute_list_opt no_attr_identifier
2110	{
2111	typedefTable.makeTypedef( *$3 );
2112	$$ = DeclarationNode::newEnum( $3, 0, false )->addQualifiers( $2 );
2113	}
2114	\| ENUM attribute_list_opt type_name
2115	{
2116	typedefTable.makeTypedef( *$3->type->symbolic.name );
2117	$$ = DeclarationNode::newEnum( $3->type->symbolic.name, 0, false )->addQualifiers( $2 );
2118	}
2119	;
2120
2121	enumerator_list:
2122	no_attr_identifier_or_type_name enumerator_value_opt
2123	{ $$ = DeclarationNode::newEnumConstant( $1, $2 ); }
2124	\| enumerator_list ',' no_attr_identifier_or_type_name enumerator_value_opt
2125	{ $$ = $1->appendList( DeclarationNode::newEnumConstant( $3, $4 ) ); }
2126	;
2127
2128	enumerator_value_opt:
2129	// empty
2130	{ $$ = nullptr; }
2131	\| '=' constant_expression
2132	{ $$ = $2; }
2133	;
2134
2135	cfa_parameter_ellipsis_list_opt: // CFA, abstract + real
2136	// empty
2137	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
2138	\| ELLIPSIS
2139	{ $$ = nullptr; }
2140	\| cfa_abstract_parameter_list
2141	\| cfa_parameter_list
2142	\| cfa_parameter_list pop ',' push cfa_abstract_parameter_list
2143	{ $$ = $1->appendList( $5 ); }
2144	\| cfa_abstract_parameter_list pop ',' push ELLIPSIS
2145	{ $$ = $1->addVarArgs(); }
2146	\| cfa_parameter_list pop ',' push ELLIPSIS
2147	{ $$ = $1->addVarArgs(); }
2148	;
2149
2150	cfa_parameter_list: // CFA
2151	// To obtain LR(1) between cfa_parameter_list and cfa_abstract_tuple, the last cfa_abstract_parameter_list is
2152	// factored out from cfa_parameter_list, flattening the rules to get lookahead to the ']'.
2153	cfa_parameter_declaration
2154	\| cfa_abstract_parameter_list pop ',' push cfa_parameter_declaration
2155	{ $$ = $1->appendList( $5 ); }
2156	\| cfa_parameter_list pop ',' push cfa_parameter_declaration
2157	{ $$ = $1->appendList( $5 ); }
2158	\| cfa_parameter_list pop ',' push cfa_abstract_parameter_list pop ',' push cfa_parameter_declaration
2159	{ $$ = $1->appendList( $5 )->appendList( $9 ); }
2160	;
2161
2162	cfa_abstract_parameter_list: // CFA, new & old style abstract
2163	cfa_abstract_parameter_declaration
2164	\| cfa_abstract_parameter_list pop ',' push cfa_abstract_parameter_declaration
2165	{ $$ = $1->appendList( $5 ); }
2166	;
2167
2168	parameter_type_list_opt:
2169	// empty
2170	{ $$ = nullptr; }
2171	\| ELLIPSIS
2172	{ $$ = nullptr; }
2173	\| parameter_list
2174	\| parameter_list pop ',' push ELLIPSIS
2175	{ $$ = $1->addVarArgs(); }
2176	;
2177
2178	parameter_list: // abstract + real
2179	abstract_parameter_declaration
2180	\| parameter_declaration
2181	\| parameter_list pop ',' push abstract_parameter_declaration
2182	{ $$ = $1->appendList( $5 ); }
2183	\| parameter_list pop ',' push parameter_declaration
2184	{ $$ = $1->appendList( $5 ); }
2185	;
2186
2187	// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
2188	// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.
2189
2190	cfa_parameter_declaration: // CFA, new & old style parameter declaration
2191	parameter_declaration
2192	\| cfa_identifier_parameter_declarator_no_tuple identifier_or_type_name default_initialize_opt
2193	{ $$ = $1->addName( $2 ); }
2194	\| cfa_abstract_tuple identifier_or_type_name default_initialize_opt
2195	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2196	{ $$ = $1->addName( $2 ); }
2197	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name default_initialize_opt
2198	{ $$ = $2->addName( $3 )->addQualifiers( $1 ); }
2199	\| cfa_function_specifier
2200	;
2201
2202	cfa_abstract_parameter_declaration: // CFA, new & old style parameter declaration
2203	abstract_parameter_declaration
2204	\| cfa_identifier_parameter_declarator_no_tuple
2205	\| cfa_abstract_tuple
2206	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2207	\| type_qualifier_list cfa_abstract_tuple
2208	{ $$ = $2->addQualifiers( $1 ); }
2209	\| cfa_abstract_function
2210	;
2211
2212	parameter_declaration:
2213	// No SUE declaration in parameter list.
2214	declaration_specifier_nobody identifier_parameter_declarator default_initialize_opt
2215	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2216	\| declaration_specifier_nobody type_parameter_redeclarator default_initialize_opt
2217	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2218	;
2219
2220	abstract_parameter_declaration:
2221	declaration_specifier_nobody default_initialize_opt
2222	{ $$ = $1->addInitializer( $2 ? new InitializerNode( $2 ) : nullptr ); }
2223	\| declaration_specifier_nobody abstract_parameter_declarator default_initialize_opt
2224	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2225	;
2226
2227	// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
2228	// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
2229	// identifiers. The ANSI-style parameter-list can redefine a typedef name.
2230
2231	identifier_list: // K&R-style parameter list => no types
2232	no_attr_identifier
2233	{ $$ = DeclarationNode::newName( $1 ); }
2234	\| identifier_list ',' no_attr_identifier
2235	{ $$ = $1->appendList( DeclarationNode::newName( $3 ) ); }
2236	;
2237
2238	identifier_or_type_name:
2239	identifier
2240	\| TYPEDEFname
2241	\| TYPEGENname
2242	;
2243
2244	no_attr_identifier_or_type_name:
2245	no_attr_identifier
2246	\| TYPEDEFname
2247	\| TYPEGENname
2248	;
2249
2250	type_no_function: // sizeof, alignof, cast (constructor)
2251	cfa_abstract_declarator_tuple // CFA
2252	\| type_specifier
2253	\| type_specifier abstract_declarator
2254	{ $$ = $2->addType( $1 ); }
2255	;
2256
2257	type: // typeof, assertion
2258	type_no_function
2259	\| cfa_abstract_function // CFA
2260	;
2261
2262	initializer_opt:
2263	// empty
2264	{ $$ = nullptr; }
2265	\| '=' initializer
2266	{ $$ = $2; }
2267	\| '=' VOID
2268	{ $$ = new InitializerNode( true ); }
2269	\| ATassign initializer
2270	{ $$ = $2->set_maybeConstructed( false ); }
2271	;
2272
2273	initializer:
2274	assignment_expression { $$ = new InitializerNode( $1 ); }
2275	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2276	;
2277
2278	initializer_list_opt:
2279	// empty
2280	{ $$ = nullptr; }
2281	\| initializer
2282	\| designation initializer { $$ = $2->set_designators( $1 ); }
2283	\| initializer_list_opt ',' initializer { $$ = (InitializerNode *)( $1->set_last( $3 ) ); }
2284	\| initializer_list_opt ',' designation initializer
2285	{ $$ = (InitializerNode *)( $1->set_last( $4->set_designators( $3 ) ) ); }
2286	;
2287
2288	// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
2289	// '=' to separator the designator from the initializer value, as in:
2290	//
2291	// int x[10] = { [1] = 3 };
2292	//
2293	// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment. To disambiguate this case, CFA
2294	// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
2295	// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
2296	// shift/reduce conflicts
2297
2298	designation:
2299	designator_list ':' // C99, CFA uses ":" instead of "="
2300	\| no_attr_identifier ':' // GCC, field name
2301	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
2302	;
2303
2304	designator_list: // C99
2305	designator
2306	\| designator_list designator
2307	{ $$ = (ExpressionNode *)( $1->set_last( $2 ) ); }
2308	//\| designator_list designator { $$ = new ExpressionNode( $1, $2 ); }
2309	;
2310
2311	designator:
2312	'.' no_attr_identifier // C99, field name
2313	{ $$ = new ExpressionNode( build_varref( $2 ) ); }
2314	\| '[' push assignment_expression pop ']' // C99, single array element
2315	// assignment_expression used instead of constant_expression because of shift/reduce conflicts with tuple.
2316	{ $$ = $3; }
2317	\| '[' push subrange pop ']' // CFA, multiple array elements
2318	{ $$ = $3; }
2319	\| '[' push constant_expression ELLIPSIS constant_expression pop ']' // GCC, multiple array elements
2320	{ $$ = new ExpressionNode( new RangeExpr( maybeMoveBuild< Expression >( $3 ), maybeMoveBuild< Expression >( $5 ) ) ); }
2321	\| '.' '[' push field_name_list pop ']' // CFA, tuple field selector
2322	{ $$ = $4; }
2323	;
2324
2325	// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
2326	// rather than an object-oriented type system. This required four groups of extensions:
2327	//
2328	// Overloading: function, data, and operator identifiers may be overloaded.
2329	//
2330	// Type declarations: "type" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
2331	// and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
2332	// definitions of new types. Type declarations with storage class "extern" provide opaque types.
2333	//
2334	// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
2335	// site. A polymorphic function is not a template; it is a function, with an address and a type.
2336	//
2337	// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
2338	// types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
2339	// hierarchies. Unlike classes, they can define relationships between types. Assertions declare that a type or
2340	// types provide the operations declared by a specification. Assertions are normally used to declare requirements
2341	// on type arguments of polymorphic functions.
2342
2343	type_parameter_list: // CFA
2344	type_parameter
2345	\| type_parameter_list ',' type_parameter
2346	{ $$ = $1->appendList( $3 ); }
2347	;
2348
2349	type_initializer_opt: // CFA
2350	// empty
2351	{ $$ = nullptr; }
2352	\| '=' type
2353	{ $$ = $2; }
2354	;
2355
2356	type_parameter: // CFA
2357	type_class no_attr_identifier_or_type_name
2358	{ typedefTable.addToScope( *$2, TYPEDEFname, "9" ); }
2359	type_initializer_opt assertion_list_opt
2360	{ $$ = DeclarationNode::newTypeParam( $1, $2 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
2361	\| type_specifier identifier_parameter_declarator
2362	\| assertion_list
2363	{ $$ = DeclarationNode::newTypeParam( DeclarationNode::Dtype, new string( DeclarationNode::anonymous.newName() ) )->addAssertions( $1 ); }
2364	;
2365
2366	type_class: // CFA
2367	OTYPE
2368	{ $$ = DeclarationNode::Otype; }
2369	\| DTYPE
2370	{ $$ = DeclarationNode::Dtype; }
2371	\| FTYPE
2372	{ $$ = DeclarationNode::Ftype; }
2373	\| TTYPE
2374	{ $$ = DeclarationNode::Ttype; }
2375	;
2376
2377	assertion_list_opt: // CFA
2378	// empty
2379	{ $$ = nullptr; }
2380	\| assertion_list
2381	;
2382
2383	assertion_list: // CFA
2384	assertion
2385	\| assertion_list assertion
2386	{ $$ = $1 ? $1->appendList( $2 ) : $2; }
2387	;
2388
2389	assertion: // CFA
2390	'\|' no_attr_identifier_or_type_name '(' type_list ')'
2391	{ $$ = DeclarationNode::newTraitUse( $2, $4 ); }
2392	\| '\|' '{' push trait_declaration_list pop '}'
2393	{ $$ = $4; }
2394	// \| '\|' '(' push type_parameter_list pop ')' '{' push trait_declaration_list pop '}' '(' type_list ')'
2395	// { SemanticError( yylloc, "Generic data-type assertion is currently unimplemented." ); $$ = nullptr; }
2396	;
2397
2398	type_list: // CFA
2399	type
2400	{ $$ = new ExpressionNode( new TypeExpr( maybeMoveBuildType( $1 ) ) ); }
2401	\| assignment_expression
2402	{ SemanticError( yylloc, toString("Expression generic parameters are currently unimplemented: ", $1->build()) ); $$ = nullptr; }
2403	\| type_list ',' type
2404	{ $$ = (ExpressionNode *)( $1->set_last( new ExpressionNode( new TypeExpr( maybeMoveBuildType( $3 ) ) ) ) ); }
2405	\| type_list ',' assignment_expression
2406	{ SemanticError( yylloc, toString("Expression generic parameters are currently unimplemented: ", $3->build()) ); $$ = nullptr; }
2407	// { $$ = (ExpressionNode *)( $1->set_last( $3 )); }
2408	;
2409
2410	type_declaring_list: // CFA
2411	OTYPE type_declarator
2412	{ $$ = $2; }
2413	\| storage_class_list OTYPE type_declarator
2414	{ $$ = $3->addQualifiers( $1 ); }
2415	\| type_declaring_list ',' type_declarator
2416	{ $$ = $1->appendList( $3->copySpecifiers( $1 ) ); }
2417	;
2418
2419	type_declarator: // CFA
2420	type_declarator_name assertion_list_opt
2421	{ $$ = $1->addAssertions( $2 ); }
2422	\| type_declarator_name assertion_list_opt '=' type
2423	{ $$ = $1->addAssertions( $2 )->addType( $4 ); }
2424	;
2425
2426	type_declarator_name: // CFA
2427	no_attr_identifier_or_type_name
2428	{
2429	typedefTable.addToEnclosingScope( *$1, TYPEDEFname, "10" );
2430	$$ = DeclarationNode::newTypeDecl( $1, 0 );
2431	}
2432	\| no_attr_identifier_or_type_name '(' type_parameter_list ')'
2433	{
2434	typedefTable.addToEnclosingScope( *$1, TYPEGENname, "11" );
2435	$$ = DeclarationNode::newTypeDecl( $1, $3 );
2436	}
2437	;
2438
2439	trait_specifier: // CFA
2440	TRAIT no_attr_identifier_or_type_name '(' type_parameter_list ')' '{' '}'
2441	{ $$ = DeclarationNode::newTrait( $2, $4, 0 ); }
2442	\| TRAIT no_attr_identifier_or_type_name '(' type_parameter_list ')' '{' push trait_declaration_list pop '}'
2443	{ $$ = DeclarationNode::newTrait( $2, $4, $8 ); }
2444	;
2445
2446	trait_declaration_list: // CFA
2447	trait_declaration
2448	\| trait_declaration_list pop push trait_declaration
2449	{ $$ = $1->appendList( $4 ); }
2450	;
2451
2452	trait_declaration: // CFA
2453	cfa_trait_declaring_list ';'
2454	\| trait_declaring_list ';'
2455	;
2456
2457	cfa_trait_declaring_list: // CFA
2458	cfa_variable_specifier
2459	\| cfa_function_specifier
2460	\| cfa_trait_declaring_list pop ',' push identifier_or_type_name
2461	{ $$ = $1->appendList( $1->cloneType( $5 ) ); }
2462	;
2463
2464	trait_declaring_list: // CFA
2465	type_specifier declarator
2466	{ $$ = $2->addType( $1 ); }
2467	\| trait_declaring_list pop ',' push declarator
2468	{ $$ = $1->appendList( $1->cloneBaseType( $5 ) ); }
2469	;
2470
2471	//*************************** EXTERNAL DEFINITIONS ***************************
2472
2473	translation_unit:
2474	// empty, input file
2475	\| external_definition_list
2476	{ parseTree = parseTree ? parseTree->appendList( $1 ) : $1; }
2477	;
2478
2479	external_definition_list:
2480	push external_definition pop
2481	{ $$ = $2; }
2482	\| external_definition_list push external_definition pop
2483	{ $$ = $1 ? $1->appendList( $3 ) : $3; }
2484	;
2485
2486	external_definition_list_opt:
2487	// empty
2488	{ $$ = nullptr; }
2489	\| external_definition_list
2490	;
2491
2492	up:
2493	{ typedefTable.up( forall ); forall = false; }
2494	;
2495
2496	down:
2497	{ typedefTable.down(); }
2498	;
2499
2500	external_definition:
2501	declaration
2502	\| external_function_definition
2503	\| EXTENSION external_definition // GCC, multiple __extension__ allowed, meaning unknown
2504	{
2505	distExt( $2 ); // mark all fields in list
2506	$$ = $2;
2507	}
2508	\| ASM '(' string_literal ')' ';' // GCC, global assembler statement
2509	{
2510	$$ = DeclarationNode::newAsmStmt( new StatementNode( build_asm( false, $3, 0 ) ) );
2511	}
2512	\| EXTERN STRINGliteral // C++-style linkage specifier
2513	{
2514	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
2515	linkage = LinkageSpec::linkageUpdate( yylloc, linkage, $2 );
2516	}
2517	'{' up external_definition_list_opt down '}'
2518	{
2519	linkage = linkageStack.top();
2520	linkageStack.pop();
2521	$$ = $6;
2522	}
2523	\| type_qualifier_list
2524	{
2525	if ( $1->type->qualifiers.val ) { SemanticError( yylloc, "CV qualifiers cannot be distributed; only storage-class and forall qualifiers." ); }
2526	if ( $1->type->forall ) forall = true; // remember generic type
2527	}
2528	'{' up external_definition_list_opt down '}' // CFA, namespace
2529	{
2530	distQual( $5, $1 );
2531	forall = false;
2532	$$ = $5;
2533	}
2534	\| declaration_qualifier_list
2535	{
2536	if ( $1->type && $1->type->qualifiers.val ) { SemanticError( yylloc, "CV qualifiers cannot be distributed; only storage-class and forall qualifiers." ); }
2537	if ( $1->type && $1->type->forall ) forall = true; // remember generic type
2538	}
2539	'{' up external_definition_list_opt down '}' // CFA, namespace
2540	{
2541	distQual( $5, $1 );
2542	forall = false;
2543	$$ = $5;
2544	}
2545	\| declaration_qualifier_list type_qualifier_list
2546	{
2547	if ( ($1->type && $1->type->qualifiers.val) \|\| $2->type->qualifiers.val ) { SemanticError( yylloc, "CV qualifiers cannot be distributed; only storage-class and forall qualifiers." ); }
2548	if ( ($1->type && $1->type->forall) \|\| $2->type->forall ) forall = true; // remember generic type
2549	}
2550	'{' up external_definition_list_opt down '}' // CFA, namespace
2551	{
2552	distQual( $6, $1->addQualifiers( $2 ) );
2553	forall = false;
2554	$$ = $6;
2555	}
2556	;
2557
2558	external_function_definition:
2559	function_definition
2560	// These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
2561	// legacy code with global functions missing the type-specifier for the return type, and assuming "int".
2562	// Parsing is possible because function_definition does not appear in the context of an expression (nested
2563	// functions preclude this concession, i.e., all nested function must have a return type). A function prototype
2564	// declaration must still have a type_specifier. OBSOLESCENT (see 1)
2565	\| function_declarator compound_statement
2566	{ $$ = $1->addFunctionBody( $2 ); }
2567	\| KR_function_declarator KR_parameter_list_opt compound_statement
2568	{ $$ = $1->addOldDeclList( $2 )->addFunctionBody( $3 ); }
2569	;
2570
2571	with_clause_opt:
2572	// empty
2573	{ $$ = nullptr; forall = false; }
2574	\| WITH '(' tuple_expression_list ')'
2575	{ $$ = $3; forall = false; }
2576	;
2577
2578	function_definition:
2579	cfa_function_declaration with_clause_opt compound_statement // CFA
2580	{
2581	// Add the function body to the last identifier in the function definition list, i.e., foo3:
2582	// [const double] foo1(), foo2( int ), foo3( double ) { return 3.0; }
2583	$1->get_last()->addFunctionBody( $3, $2 );
2584	$$ = $1;
2585	}
2586	\| declaration_specifier function_declarator with_clause_opt compound_statement
2587	{
2588	rebindForall( $1, $2 );
2589	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
2590	}
2591	\| declaration_specifier variable_type_redeclarator with_clause_opt compound_statement
2592	{
2593	rebindForall( $1, $2 );
2594	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
2595	}
2596	// handles default int return type, OBSOLESCENT (see 1)
2597	\| type_qualifier_list function_declarator with_clause_opt compound_statement
2598	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
2599	// handles default int return type, OBSOLESCENT (see 1)
2600	\| declaration_qualifier_list function_declarator with_clause_opt compound_statement
2601	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
2602	// handles default int return type, OBSOLESCENT (see 1)
2603	\| declaration_qualifier_list type_qualifier_list function_declarator with_clause_opt compound_statement
2604	{ $$ = $3->addFunctionBody( $5, $4 )->addQualifiers( $2 )->addQualifiers( $1 ); }
2605
2606	// Old-style K&R function definition, OBSOLESCENT (see 4)
2607	\| declaration_specifier KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2608	{
2609	rebindForall( $1, $2 );
2610	$$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addType( $1 );
2611	}
2612	// handles default int return type, OBSOLESCENT (see 1)
2613	\| type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2614	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
2615	// handles default int return type, OBSOLESCENT (see 1)
2616	\| declaration_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2617	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
2618	// handles default int return type, OBSOLESCENT (see 1)
2619	\| declaration_qualifier_list type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2620	{ $$ = $3->addOldDeclList( $4 )->addFunctionBody( $6, $5 )->addQualifiers( $2 )->addQualifiers( $1 ); }
2621	;
2622
2623	declarator:
2624	variable_declarator
2625	\| variable_type_redeclarator
2626	\| function_declarator
2627	;
2628
2629	subrange:
2630	constant_expression '~' constant_expression // CFA, integer subrange
2631	{ $$ = new ExpressionNode( new RangeExpr( maybeMoveBuild< Expression >( $1 ), maybeMoveBuild< Expression >( $3 ) ) ); }
2632	;
2633
2634	asm_name_opt: // GCC
2635	// empty
2636	{ $$ = nullptr; }
2637	\| ASM '(' string_literal ')' attribute_list_opt
2638	{
2639	DeclarationNode * name = new DeclarationNode();
2640	name->asmName = $3;
2641	$$ = name->addQualifiers( $5 );
2642	}
2643	;
2644
2645	attribute_list_opt: // GCC
2646	// empty
2647	{ $$ = nullptr; }
2648	\| attribute_list
2649	;
2650
2651	attribute_list: // GCC
2652	attribute
2653	\| attribute_list attribute
2654	{ $$ = $2->addQualifiers( $1 ); }
2655	;
2656
2657	attribute: // GCC
2658	ATTRIBUTE '(' '(' attribute_name_list ')' ')'
2659	{ $$ = $4; }
2660	;
2661
2662	attribute_name_list: // GCC
2663	attribute_name
2664	\| attribute_name_list ',' attribute_name
2665	{ $$ = $3->addQualifiers( $1 ); }
2666	;
2667
2668	attribute_name: // GCC
2669	// empty
2670	{ $$ = nullptr; }
2671	\| attr_name
2672	{ $$ = DeclarationNode::newAttribute( $1 ); }
2673	\| attr_name '(' argument_expression_list ')'
2674	{ $$ = DeclarationNode::newAttribute( $1, $3 ); }
2675	;
2676
2677	attr_name: // GCC
2678	IDENTIFIER
2679	\| quasi_keyword
2680	\| TYPEDEFname
2681	\| TYPEGENname
2682	\| FALLTHROUGH
2683	{ $$ = Token{ new string( "fallthrough" ), { nullptr, -1 } }; }
2684	\| CONST
2685	{ $$ = Token{ new string( "__const__" ), { nullptr, -1 } }; }
2686	;
2687
2688	// ============================================================================
2689	// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
2690	// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
2691	// in:
2692	//
2693	// int (*f())[10] { ... };
2694	// ... (*f())[3] += 1; // definition mimics usage
2695	//
2696	// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
2697	// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
2698	// ============================================================================
2699
2700	// ----------------------------------------------------------------------------
2701	// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
2702	// to define a variable or function prototype, e.g.:
2703	//
2704	// valid declaration invalid definition
2705	// ----------------- ------------------
2706	// int f; int f {}
2707	// int f; int f {}
2708	// int f[10]; int f[10] {}
2709	// int (f)(int); int (f)(int) {}
2710	//
2711	// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
2712	// variable_declarator and function_declarator.
2713	// ----------------------------------------------------------------------------
2714
2715	// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
2716	// declaring an array of functions versus a pointer to an array of functions.
2717
2718	variable_declarator:
2719	paren_identifier attribute_list_opt
2720	{ $$ = $1->addQualifiers( $2 ); }
2721	\| variable_ptr
2722	\| variable_array attribute_list_opt
2723	{ $$ = $1->addQualifiers( $2 ); }
2724	\| variable_function attribute_list_opt
2725	{ $$ = $1->addQualifiers( $2 ); }
2726	;
2727
2728	paren_identifier:
2729	identifier
2730	{ $$ = DeclarationNode::newName( $1 ); }
2731	\| '(' paren_identifier ')' // redundant parenthesis
2732	{ $$ = $2; }
2733	;
2734
2735	variable_ptr:
2736	ptrref_operator variable_declarator
2737	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2738	\| ptrref_operator type_qualifier_list variable_declarator
2739	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2740	\| '(' variable_ptr ')' attribute_list_opt
2741	{ $$ = $2->addQualifiers( $4 ); } // redundant parenthesis
2742	;
2743
2744	variable_array:
2745	paren_identifier array_dimension
2746	{ $$ = $1->addArray( $2 ); }
2747	\| '(' variable_ptr ')' array_dimension
2748	{ $$ = $2->addArray( $4 ); }
2749	\| '(' variable_array ')' multi_array_dimension // redundant parenthesis
2750	{ $$ = $2->addArray( $4 ); }
2751	\| '(' variable_array ')' // redundant parenthesis
2752	{ $$ = $2; }
2753	;
2754
2755	variable_function:
2756	'(' variable_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2757	{ $$ = $2->addParamList( $6 ); }
2758	\| '(' variable_function ')' // redundant parenthesis
2759	{ $$ = $2; }
2760	;
2761
2762	// This pattern parses a function declarator that is not redefining a typedef name. For non-nested functions, there is
2763	// no context where a function definition can redefine a typedef name, i.e., the typedef and function name cannot exist
2764	// is the same scope. The pattern precludes returning arrays and functions versus pointers to arrays and functions.
2765
2766	function_declarator:
2767	function_no_ptr attribute_list_opt
2768	{ $$ = $1->addQualifiers( $2 ); }
2769	\| function_ptr
2770	\| function_array attribute_list_opt
2771	{ $$ = $1->addQualifiers( $2 ); }
2772	;
2773
2774	function_no_ptr:
2775	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2776	{ $$ = $1->addParamList( $4 ); }
2777	\| '(' function_ptr ')' '(' push parameter_type_list_opt pop ')'
2778	{ $$ = $2->addParamList( $6 ); }
2779	\| '(' function_no_ptr ')' // redundant parenthesis
2780	{ $$ = $2; }
2781	;
2782
2783	function_ptr:
2784	ptrref_operator function_declarator
2785	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2786	\| ptrref_operator type_qualifier_list function_declarator
2787	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2788	\| '(' function_ptr ')'
2789	{ $$ = $2; }
2790	;
2791
2792	function_array:
2793	'(' function_ptr ')' array_dimension
2794	{ $$ = $2->addArray( $4 ); }
2795	\| '(' function_array ')' multi_array_dimension // redundant parenthesis
2796	{ $$ = $2->addArray( $4 ); }
2797	\| '(' function_array ')' // redundant parenthesis
2798	{ $$ = $2; }
2799	;
2800
2801	// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4)
2802	//
2803	// f( a, b, c ) int a, *b, c[]; {}
2804	//
2805	// that is not redefining a typedef name (see function_declarator for additional comments). The pattern precludes
2806	// returning arrays and functions versus pointers to arrays and functions.
2807
2808	KR_function_declarator:
2809	KR_function_no_ptr
2810	\| KR_function_ptr
2811	\| KR_function_array
2812	;
2813
2814	KR_function_no_ptr:
2815	paren_identifier '(' identifier_list ')' // function_declarator handles empty parameter
2816	{ $$ = $1->addIdList( $3 ); }
2817	\| '(' KR_function_ptr ')' '(' push parameter_type_list_opt pop ')'
2818	{ $$ = $2->addParamList( $6 ); }
2819	\| '(' KR_function_no_ptr ')' // redundant parenthesis
2820	{ $$ = $2; }
2821	;
2822
2823	KR_function_ptr:
2824	ptrref_operator KR_function_declarator
2825	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2826	\| ptrref_operator type_qualifier_list KR_function_declarator
2827	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2828	\| '(' KR_function_ptr ')'
2829	{ $$ = $2; }
2830	;
2831
2832	KR_function_array:
2833	'(' KR_function_ptr ')' array_dimension
2834	{ $$ = $2->addArray( $4 ); }
2835	\| '(' KR_function_array ')' multi_array_dimension // redundant parenthesis
2836	{ $$ = $2->addArray( $4 ); }
2837	\| '(' KR_function_array ')' // redundant parenthesis
2838	{ $$ = $2; }
2839	;
2840
2841	// This pattern parses a declaration for a variable or function prototype that redefines a type name, e.g.:
2842	//
2843	// typedef int foo;
2844	// {
2845	// int foo; // redefine typedef name in new scope
2846	// }
2847	//
2848	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
2849	// and functions versus pointers to arrays and functions.
2850
2851	variable_type_redeclarator:
2852	paren_type attribute_list_opt
2853	{ $$ = $1->addQualifiers( $2 ); }
2854	\| type_ptr
2855	\| type_array attribute_list_opt
2856	{ $$ = $1->addQualifiers( $2 ); }
2857	\| type_function attribute_list_opt
2858	{ $$ = $1->addQualifiers( $2 ); }
2859	;
2860
2861	paren_type:
2862	typedef
2863	// hide type name in enclosing scope by variable name
2864	{
2865	// if ( ! typedefTable.existsCurr( *$1->name ) ) {
2866	typedefTable.addToEnclosingScope( *$1->name, IDENTIFIER, "ID" );
2867	// } else {
2868	// SemanticError( yylloc, string("'") + *$1->name + "' redeclared as different kind of symbol." ); $$ = nullptr;
2869	// } // if
2870	}
2871	\| '(' paren_type ')'
2872	{ $$ = $2; }
2873	;
2874
2875	type_ptr:
2876	ptrref_operator variable_type_redeclarator
2877	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2878	\| ptrref_operator type_qualifier_list variable_type_redeclarator
2879	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2880	\| '(' type_ptr ')' attribute_list_opt
2881	{ $$ = $2->addQualifiers( $4 ); } // redundant parenthesis
2882	;
2883
2884	type_array:
2885	paren_type array_dimension
2886	{ $$ = $1->addArray( $2 ); }
2887	\| '(' type_ptr ')' array_dimension
2888	{ $$ = $2->addArray( $4 ); }
2889	\| '(' type_array ')' multi_array_dimension // redundant parenthesis
2890	{ $$ = $2->addArray( $4 ); }
2891	\| '(' type_array ')' // redundant parenthesis
2892	{ $$ = $2; }
2893	;
2894
2895	type_function:
2896	paren_type '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2897	{ $$ = $1->addParamList( $4 ); }
2898	\| '(' type_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2899	{ $$ = $2->addParamList( $6 ); }
2900	\| '(' type_function ')' // redundant parenthesis
2901	{ $$ = $2; }
2902	;
2903
2904	// This pattern parses a declaration for a parameter variable of a function prototype or actual that is not redefining a
2905	// typedef name and allows the C99 array options, which can only appear in a parameter list. The pattern precludes
2906	// declaring an array of functions versus a pointer to an array of functions, and returning arrays and functions versus
2907	// pointers to arrays and functions.
2908
2909	identifier_parameter_declarator:
2910	paren_identifier attribute_list_opt
2911	{ $$ = $1->addQualifiers( $2 ); }
2912	\| '&' MUTEX paren_identifier attribute_list_opt
2913	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( Type::Mutex ), OperKinds::AddressOf ) )->addQualifiers( $4 ); }
2914	\| identifier_parameter_ptr
2915	\| identifier_parameter_array attribute_list_opt
2916	{ $$ = $1->addQualifiers( $2 ); }
2917	\| identifier_parameter_function attribute_list_opt
2918	{ $$ = $1->addQualifiers( $2 ); }
2919	;
2920
2921	identifier_parameter_ptr:
2922	ptrref_operator identifier_parameter_declarator
2923	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2924	\| ptrref_operator type_qualifier_list identifier_parameter_declarator
2925	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2926	\| '(' identifier_parameter_ptr ')' attribute_list_opt
2927	{ $$ = $2->addQualifiers( $4 ); }
2928	;
2929
2930	identifier_parameter_array:
2931	paren_identifier array_parameter_dimension
2932	{ $$ = $1->addArray( $2 ); }
2933	\| '(' identifier_parameter_ptr ')' array_dimension
2934	{ $$ = $2->addArray( $4 ); }
2935	\| '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
2936	{ $$ = $2->addArray( $4 ); }
2937	\| '(' identifier_parameter_array ')' // redundant parenthesis
2938	{ $$ = $2; }
2939	;
2940
2941	identifier_parameter_function:
2942	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2943	{ $$ = $1->addParamList( $4 ); }
2944	\| '(' identifier_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2945	{ $$ = $2->addParamList( $6 ); }
2946	\| '(' identifier_parameter_function ')' // redundant parenthesis
2947	{ $$ = $2; }
2948	;
2949
2950	// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
2951	// e.g.:
2952	//
2953	// typedef int foo;
2954	// forall( otype T ) struct foo;
2955	// int f( int foo ); // redefine typedef name in new scope
2956	//
2957	// and allows the C99 array options, which can only appear in a parameter list.
2958
2959	type_parameter_redeclarator:
2960	typedef attribute_list_opt
2961	{ $$ = $1->addQualifiers( $2 ); }
2962	\| '&' MUTEX typedef attribute_list_opt
2963	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( Type::Mutex ), OperKinds::AddressOf ) )->addQualifiers( $4 ); }
2964	\| type_parameter_ptr
2965	\| type_parameter_array attribute_list_opt
2966	{ $$ = $1->addQualifiers( $2 ); }
2967	\| type_parameter_function attribute_list_opt
2968	{ $$ = $1->addQualifiers( $2 ); }
2969	;
2970
2971	typedef:
2972	TYPEDEFname
2973	{ $$ = DeclarationNode::newName( $1 ); }
2974	\| TYPEGENname
2975	{ $$ = DeclarationNode::newName( $1 ); }
2976	;
2977
2978	type_parameter_ptr:
2979	ptrref_operator type_parameter_redeclarator
2980	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2981	\| ptrref_operator type_qualifier_list type_parameter_redeclarator
2982	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2983	\| '(' type_parameter_ptr ')' attribute_list_opt
2984	{ $$ = $2->addQualifiers( $4 ); }
2985	;
2986
2987	type_parameter_array:
2988	typedef array_parameter_dimension
2989	{ $$ = $1->addArray( $2 ); }
2990	\| '(' type_parameter_ptr ')' array_parameter_dimension
2991	{ $$ = $2->addArray( $4 ); }
2992	;
2993
2994	type_parameter_function:
2995	typedef '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2996	{ $$ = $1->addParamList( $4 ); }
2997	\| '(' type_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
2998	{ $$ = $2->addParamList( $6 ); }
2999	;
3000
3001	// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
3002	// which the type applies, e.g.:
3003	//
3004	// sizeof( int );
3005	// sizeof( int * );
3006	// sizeof( int [10] );
3007	// sizeof( int (*)() );
3008	// sizeof( int () );
3009	//
3010	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3011	// and functions versus pointers to arrays and functions.
3012
3013	abstract_declarator:
3014	abstract_ptr
3015	\| abstract_array attribute_list_opt
3016	{ $$ = $1->addQualifiers( $2 ); }
3017	\| abstract_function attribute_list_opt
3018	{ $$ = $1->addQualifiers( $2 ); }
3019	;
3020
3021	abstract_ptr:
3022	ptrref_operator
3023	{ $$ = DeclarationNode::newPointer( 0, $1 ); }
3024	\| ptrref_operator type_qualifier_list
3025	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3026	\| ptrref_operator abstract_declarator
3027	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3028	\| ptrref_operator type_qualifier_list abstract_declarator
3029	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3030	\| '(' abstract_ptr ')' attribute_list_opt
3031	{ $$ = $2->addQualifiers( $4 ); }
3032	;
3033
3034	abstract_array:
3035	array_dimension
3036	\| '(' abstract_ptr ')' array_dimension
3037	{ $$ = $2->addArray( $4 ); }
3038	\| '(' abstract_array ')' multi_array_dimension // redundant parenthesis
3039	{ $$ = $2->addArray( $4 ); }
3040	\| '(' abstract_array ')' // redundant parenthesis
3041	{ $$ = $2; }
3042	;
3043
3044	abstract_function:
3045	'(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3046	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $3, nullptr ); }
3047	\| '(' abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3048	{ $$ = $2->addParamList( $6 ); }
3049	\| '(' abstract_function ')' // redundant parenthesis
3050	{ $$ = $2; }
3051	;
3052
3053	array_dimension:
3054	// Only the first dimension can be empty.
3055	'[' ']'
3056	{ $$ = DeclarationNode::newArray( 0, 0, false ); }
3057	\| '[' ']' multi_array_dimension
3058	{ $$ = DeclarationNode::newArray( 0, 0, false )->addArray( $3 ); }
3059	\| multi_array_dimension
3060	;
3061
3062	multi_array_dimension:
3063	'[' push assignment_expression pop ']'
3064	{ $$ = DeclarationNode::newArray( $3, 0, false ); }
3065	\| '[' push '*' pop ']' // C99
3066	{ $$ = DeclarationNode::newVarArray( 0 ); }
3067	\| multi_array_dimension '[' push assignment_expression pop ']'
3068	{ $$ = $1->addArray( DeclarationNode::newArray( $4, 0, false ) ); }
3069	\| multi_array_dimension '[' push '*' pop ']' // C99
3070	{ $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
3071	;
3072
3073	// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
3074	// identifier to which the type applies, e.g.:
3075	//
3076	// int f( int ); // not handled here
3077	// int f( int * ); // abstract function-prototype parameter; no parameter name specified
3078	// int f( int (*)() ); // abstract function-prototype parameter; no parameter name specified
3079	// int f( int (int) ); // abstract function-prototype parameter; no parameter name specified
3080	//
3081	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3082	// and functions versus pointers to arrays and functions. In addition, the pattern handles the
3083	// special meaning of parenthesis around a typedef name:
3084	//
3085	// ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
3086	// parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
3087	// not as redundant parentheses around the identifier."
3088	//
3089	// For example:
3090	//
3091	// typedef float T;
3092	// int f( int ( T [5] ) ); // see abstract_parameter_declarator
3093	// int g( int ( T ( int ) ) ); // see abstract_parameter_declarator
3094	// int f( int f1( T a[5] ) ); // see identifier_parameter_declarator
3095	// int g( int g1( T g2( int p ) ) ); // see identifier_parameter_declarator
3096	//
3097	// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
3098	// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
3099	// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
3100	// functions.
3101
3102	abstract_parameter_declarator:
3103	abstract_parameter_ptr
3104	\| '&' MUTEX attribute_list_opt
3105	{ $$ = DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( Type::Mutex ), OperKinds::AddressOf )->addQualifiers( $3 ); }
3106	\| abstract_parameter_array attribute_list_opt
3107	{ $$ = $1->addQualifiers( $2 ); }
3108	\| abstract_parameter_function attribute_list_opt
3109	{ $$ = $1->addQualifiers( $2 ); }
3110	;
3111
3112	abstract_parameter_ptr:
3113	ptrref_operator
3114	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
3115	\| ptrref_operator type_qualifier_list
3116	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3117	\| ptrref_operator abstract_parameter_declarator
3118	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3119	\| ptrref_operator type_qualifier_list abstract_parameter_declarator
3120	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3121	\| '(' abstract_parameter_ptr ')' attribute_list_opt
3122	{ $$ = $2->addQualifiers( $4 ); }
3123	;
3124
3125	abstract_parameter_array:
3126	array_parameter_dimension
3127	\| '(' abstract_parameter_ptr ')' array_parameter_dimension
3128	{ $$ = $2->addArray( $4 ); }
3129	\| '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
3130	{ $$ = $2->addArray( $4 ); }
3131	\| '(' abstract_parameter_array ')' // redundant parenthesis
3132	{ $$ = $2; }
3133	;
3134
3135	abstract_parameter_function:
3136	'(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3137	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $3, nullptr ); }
3138	\| '(' abstract_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3139	{ $$ = $2->addParamList( $6 ); }
3140	\| '(' abstract_parameter_function ')' // redundant parenthesis
3141	{ $$ = $2; }
3142	;
3143
3144	array_parameter_dimension:
3145	// Only the first dimension can be empty or have qualifiers.
3146	array_parameter_1st_dimension
3147	\| array_parameter_1st_dimension multi_array_dimension
3148	{ $$ = $1->addArray( $2 ); }
3149	\| multi_array_dimension
3150	;
3151
3152	// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
3153	//
3154	// ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
3155	// a declaration of a function parameter with an array type, and then only in the outermost array type derivation."
3156
3157	array_parameter_1st_dimension:
3158	'[' ']'
3159	{ $$ = DeclarationNode::newArray( 0, 0, false ); }
3160	// multi_array_dimension handles the '[' '*' ']' case
3161	\| '[' push type_qualifier_list '*' pop ']' // remaining C99
3162	{ $$ = DeclarationNode::newVarArray( $3 ); }
3163	\| '[' push type_qualifier_list pop ']'
3164	{ $$ = DeclarationNode::newArray( 0, $3, false ); }
3165	// multi_array_dimension handles the '[' assignment_expression ']' case
3166	\| '[' push type_qualifier_list assignment_expression pop ']'
3167	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
3168	\| '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
3169	{ $$ = DeclarationNode::newArray( $5, $4, true ); }
3170	\| '[' push type_qualifier_list STATIC assignment_expression pop ']'
3171	{ $$ = DeclarationNode::newArray( $5, $3, true ); }
3172	;
3173
3174	// This pattern parses a declaration of an abstract variable, but does not allow "int ()" for a function pointer.
3175	//
3176	// struct S {
3177	// int;
3178	// int *;
3179	// int [10];
3180	// int (*)();
3181	// };
3182
3183	variable_abstract_declarator:
3184	variable_abstract_ptr
3185	\| variable_abstract_array attribute_list_opt
3186	{ $$ = $1->addQualifiers( $2 ); }
3187	\| variable_abstract_function attribute_list_opt
3188	{ $$ = $1->addQualifiers( $2 ); }
3189	;
3190
3191	variable_abstract_ptr:
3192	ptrref_operator
3193	{ $$ = DeclarationNode::newPointer( 0, $1 ); }
3194	\| ptrref_operator type_qualifier_list
3195	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3196	\| ptrref_operator variable_abstract_declarator
3197	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3198	\| ptrref_operator type_qualifier_list variable_abstract_declarator
3199	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3200	\| '(' variable_abstract_ptr ')' attribute_list_opt
3201	{ $$ = $2->addQualifiers( $4 ); }
3202	;
3203
3204	variable_abstract_array:
3205	array_dimension
3206	\| '(' variable_abstract_ptr ')' array_dimension
3207	{ $$ = $2->addArray( $4 ); }
3208	\| '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
3209	{ $$ = $2->addArray( $4 ); }
3210	\| '(' variable_abstract_array ')' // redundant parenthesis
3211	{ $$ = $2; }
3212	;
3213
3214	variable_abstract_function:
3215	'(' variable_abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3216	{ $$ = $2->addParamList( $6 ); }
3217	\| '(' variable_abstract_function ')' // redundant parenthesis
3218	{ $$ = $2; }
3219	;
3220
3221	// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
3222	// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.
3223
3224	cfa_identifier_parameter_declarator_tuple: // CFA
3225	cfa_identifier_parameter_declarator_no_tuple
3226	\| cfa_abstract_tuple
3227	\| type_qualifier_list cfa_abstract_tuple
3228	{ $$ = $2->addQualifiers( $1 ); }
3229	;
3230
3231	cfa_identifier_parameter_declarator_no_tuple: // CFA
3232	cfa_identifier_parameter_ptr
3233	\| cfa_identifier_parameter_array
3234	;
3235
3236	cfa_identifier_parameter_ptr: // CFA
3237	// No SUE declaration in parameter list.
3238	ptrref_operator type_specifier_nobody
3239	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3240	\| type_qualifier_list ptrref_operator type_specifier_nobody
3241	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3242	\| ptrref_operator cfa_abstract_function
3243	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3244	\| type_qualifier_list ptrref_operator cfa_abstract_function
3245	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3246	\| ptrref_operator cfa_identifier_parameter_declarator_tuple
3247	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3248	\| type_qualifier_list ptrref_operator cfa_identifier_parameter_declarator_tuple
3249	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3250	;
3251
3252	cfa_identifier_parameter_array: // CFA
3253	// Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
3254	// shift/reduce conflict with new-style empty (void) function return type.
3255	'[' ']' type_specifier_nobody
3256	{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3257	\| cfa_array_parameter_1st_dimension type_specifier_nobody
3258	{ $$ = $2->addNewArray( $1 ); }
3259	\| '[' ']' multi_array_dimension type_specifier_nobody
3260	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3261	\| cfa_array_parameter_1st_dimension multi_array_dimension type_specifier_nobody
3262	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
3263	\| multi_array_dimension type_specifier_nobody
3264	{ $$ = $2->addNewArray( $1 ); }
3265
3266	\| '[' ']' cfa_identifier_parameter_ptr
3267	{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3268	\| cfa_array_parameter_1st_dimension cfa_identifier_parameter_ptr
3269	{ $$ = $2->addNewArray( $1 ); }
3270	\| '[' ']' multi_array_dimension cfa_identifier_parameter_ptr
3271	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3272	\| cfa_array_parameter_1st_dimension multi_array_dimension cfa_identifier_parameter_ptr
3273	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
3274	\| multi_array_dimension cfa_identifier_parameter_ptr
3275	{ $$ = $2->addNewArray( $1 ); }
3276	;
3277
3278	cfa_array_parameter_1st_dimension:
3279	'[' push type_qualifier_list '*' pop ']' // remaining C99
3280	{ $$ = DeclarationNode::newVarArray( $3 ); }
3281	\| '[' push type_qualifier_list assignment_expression pop ']'
3282	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
3283	\| '[' push declaration_qualifier_list assignment_expression pop ']'
3284	// declaration_qualifier_list must be used because of shift/reduce conflict with
3285	// assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
3286	// appear in this context.
3287	{ $$ = DeclarationNode::newArray( $4, $3, true ); }
3288	\| '[' push declaration_qualifier_list type_qualifier_list assignment_expression pop ']'
3289	{ $$ = DeclarationNode::newArray( $5, $4->addQualifiers( $3 ), true ); }
3290	;
3291
3292	// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
3293	// identifier to which the type applies, e.g.:
3294	//
3295	// [int] f( int ); // abstract variable parameter; no parameter name specified
3296	// [int] f( [int] (int) ); // abstract function-prototype parameter; no parameter name specified
3297	//
3298	// These rules need LR(3):
3299	//
3300	// cfa_abstract_tuple identifier_or_type_name
3301	// '[' cfa_parameter_list ']' identifier_or_type_name '(' cfa_parameter_ellipsis_list_opt ')'
3302	//
3303	// since a function return type can be syntactically identical to a tuple type:
3304	//
3305	// [int, int] t;
3306	// [int, int] f( int );
3307	//
3308	// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
3309	// cfa_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
3310	// lookahead. To accomplish this, cfa_abstract_declarator has an entry point without tuple, and tuple declarations are
3311	// duplicated when appearing with cfa_function_specifier.
3312
3313	cfa_abstract_declarator_tuple: // CFA
3314	cfa_abstract_tuple
3315	\| type_qualifier_list cfa_abstract_tuple
3316	{ $$ = $2->addQualifiers( $1 ); }
3317	\| cfa_abstract_declarator_no_tuple
3318	;
3319
3320	cfa_abstract_declarator_no_tuple: // CFA
3321	cfa_abstract_ptr
3322	\| cfa_abstract_array
3323	;
3324
3325	cfa_abstract_ptr: // CFA
3326	ptrref_operator type_specifier
3327	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3328	\| type_qualifier_list ptrref_operator type_specifier
3329	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3330	\| ptrref_operator cfa_abstract_function
3331	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3332	\| type_qualifier_list ptrref_operator cfa_abstract_function
3333	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3334	\| ptrref_operator cfa_abstract_declarator_tuple
3335	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3336	\| type_qualifier_list ptrref_operator cfa_abstract_declarator_tuple
3337	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3338	;
3339
3340	cfa_abstract_array: // CFA
3341	// Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
3342	// empty (void) function return type.
3343	'[' ']' type_specifier
3344	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3345	\| '[' ']' multi_array_dimension type_specifier
3346	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3347	\| multi_array_dimension type_specifier
3348	{ $$ = $2->addNewArray( $1 ); }
3349	\| '[' ']' cfa_abstract_ptr
3350	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3351	\| '[' ']' multi_array_dimension cfa_abstract_ptr
3352	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3353	\| multi_array_dimension cfa_abstract_ptr
3354	{ $$ = $2->addNewArray( $1 ); }
3355	;
3356
3357	cfa_abstract_tuple: // CFA
3358	'[' push cfa_abstract_parameter_list pop ']'
3359	{ $$ = DeclarationNode::newTuple( $3 ); }
3360	\| '[' push type_specifier_nobody ELLIPSIS pop ']'
3361	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
3362	\| '[' push type_specifier_nobody ELLIPSIS constant_expression pop ']'
3363	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
3364	;
3365
3366	cfa_abstract_function: // CFA
3367	// '[' ']' '(' cfa_parameter_ellipsis_list_opt ')'
3368	// { $$ = DeclarationNode::newFunction( nullptr, DeclarationNode::newTuple( nullptr ), $4, nullptr ); }
3369	cfa_abstract_tuple '(' push cfa_parameter_ellipsis_list_opt pop ')'
3370	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
3371	\| cfa_function_return '(' push cfa_parameter_ellipsis_list_opt pop ')'
3372	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
3373	;
3374
3375	// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
3376	// each declaration, and in the specifier-qualifier list in each structure declaration and type name."
3377	//
3378	// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
3379	// the declaration specifiers in a declaration is an obsolescent feature."
3380	//
3381	// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
3382	// prototype-format parameter type declarators) is an obsolescent feature."
3383	//
3384	// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
3385	// declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.
3386
3387	//*********************** MISCELLANEOUS ******************************
3388
3389	comma_opt: // redundant comma
3390	// empty
3391	\| ','
3392	;
3393
3394	default_initialize_opt:
3395	// empty
3396	{ $$ = nullptr; }
3397	\| '=' assignment_expression
3398	{ $$ = $2; }
3399	;
3400
3401	%%
3402
3403	// ----end of grammar----
3404
3405	// Local Variables: //
3406	// mode: c++ //
3407	// tab-width: 4 //
3408	// compile-command: "make install" //
3409	// End: //

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