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parser.yy @ 2a77817

ADTast-experimentalenumpthread-emulationqualifiedEnum

Last change on this file since 2a77817 was d824715, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago
support reverse array subscript, 3[a] => a[3], 3abc? => "abc"[3]
Property mode set to `100644`
File size: 148.5 KB

Line
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 : Mon Mar 14 16:35:29 2022
13	// Update Count : 5276
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	// designation with '=' (use ':' instead)
29	//
30	// This incompatibility is discussed in detail before the "designation" grammar rule. Most of the syntactic extensions
31	// from ANSI90 to ANSI11 C are marked with the comment "C99/C11".
32
33	// This grammar also has two levels of extensions. The first extensions cover most of the GCC C extensions. All of the
34	// syntactic extensions for GCC C are marked with the comment "GCC". The second extensions are for Cforall (CFA), which
35	// fixes several of C's outstanding problems and extends C with many modern language concepts. All of the syntactic
36	// extensions for CFA C are marked with the comment "CFA".
37
38	%{
39	#define YYDEBUG_LEXER_TEXT( yylval ) // lexer loads this up each time
40	#define YYDEBUG 1 // get the pretty debugging code to compile
41	#define YYERROR_VERBOSE // more information in syntax errors
42
43	#undef __GNUC_MINOR__
44
45	#include <cstdio>
46	#include <stack>
47	using namespace std;
48
49	#include "SynTree/Declaration.h"
50	#include "ParseNode.h"
51	#include "TypedefTable.h"
52	#include "TypeData.h"
53	#include "SynTree/LinkageSpec.h"
54	#include "Common/SemanticError.h" // error_str
55	#include "Common/utility.h" // for maybeMoveBuild, maybeBuild, CodeLo...
56
57	extern DeclarationNode * parseTree;
58	extern LinkageSpec::Spec linkage;
59	extern TypedefTable typedefTable;
60
61	stack<LinkageSpec::Spec> linkageStack;
62
63	bool appendStr( string & to, string & from ) {
64	// 1. Multiple strings are concatenated into a single string but not combined internally. The reason is that
65	// "\x12" "3" is treated as 2 characters versus 1 because "escape sequences are converted into single members of
66	// the execution character set just prior to adjacent string literal concatenation" (C11, Section 6.4.5-8). It is
67	// easier to let the C compiler handle this case.
68	//
69	// 2. String encodings are transformed into canonical form (one encoding at start) so the encoding can be found
70	// without searching the string, e.g.: "abc" L"def" L"ghi" => L"abc" "def" "ghi". Multiple encodings must match,
71	// e.g., u"a" U"b" L"c" is disallowed.
72
73	if ( from[0] != '"' ) { // encoding ?
74	if ( to[0] != '"' ) { // encoding ?
75	if ( to[0] != from[0] \|\| to[1] != from[1] ) { // different encodings ?
76	yyerror( "non-matching string encodings for string-literal concatenation" );
77	return false; // parse error, must call YYERROR in action
78	} else if ( from[1] == '8' ) {
79	from.erase( 0, 1 ); // remove 2nd encoding
80	} // if
81	} else {
82	if ( from[1] == '8' ) { // move encoding to start
83	to = "u8" + to;
84	from.erase( 0, 1 ); // remove 2nd encoding
85	} else {
86	to = from[0] + to;
87	} // if
88	} // if
89	from.erase( 0, 1 ); // remove 2nd encoding
90	} // if
91	to += " " + from; // concatenated into single string
92	return true;
93	} // appendStr
94
95	DeclarationNode * distAttr( DeclarationNode * specifier, DeclarationNode * declList ) {
96	// distribute declaration_specifier across all declared variables, e.g., static, const, __attribute__.
97	DeclarationNode * cur = declList, * cl = (new DeclarationNode)->addType( specifier );
98	for ( cur = dynamic_cast<DeclarationNode >( cur->get_next() ); cur != nullptr; cur = dynamic_cast<DeclarationNode >( cur->get_next() ) ) {
99	cl->cloneBaseType( cur );
100	} // for
101	declList->addType( cl );
102	return declList;
103	} // distAttr
104
105	void distExt( DeclarationNode * declaration ) {
106	// distribute EXTENSION across all declarations
107	for ( DeclarationNode iter = declaration; iter != nullptr; iter = (DeclarationNode )iter->get_next() ) {
108	iter->set_extension( true );
109	} // for
110	} // distExt
111
112	void distInl( DeclarationNode * declaration ) {
113	// distribute EXTENSION across all declarations
114	for ( DeclarationNode iter = declaration; iter != nullptr; iter = (DeclarationNode )iter->get_next() ) {
115	iter->set_inLine( true );
116	} // for
117	} // distInl
118
119	void distQual( DeclarationNode * declaration, DeclarationNode * qualifiers ) {
120	// distribute qualifiers across all non-variable declarations in a distribution statemement
121	for ( DeclarationNode * iter = declaration; iter != nullptr; iter = (DeclarationNode *)iter->get_next() ) {
122	// SKULLDUGGERY: Distributions are parsed inside out, so qualifiers are added to declarations inside out. Since
123	// addQualifiers appends to the back of the list, the forall clauses are in the wrong order (right to left). To
124	// get the qualifiers in the correct order and still use addQualifiers (otherwise, 90% of addQualifiers has to
125	// be copied to add to front), the appropriate forall pointers are interchanged before calling addQualifiers.
126	DeclarationNode * clone = qualifiers->clone();
127	if ( qualifiers->type ) { // forall clause ? (handles SC)
128	if ( iter->type->kind == TypeData::Aggregate ) { // struct/union ?
129	swap( clone->type->forall, iter->type->aggregate.params );
130	iter->addQualifiers( clone );
131	} else if ( iter->type->kind == TypeData::AggregateInst && iter->type->aggInst.aggregate->aggregate.body ) { // struct/union ?
132	// Create temporary node to hold aggregate, call addQualifiers as above, then put nodes back together.
133	DeclarationNode newnode;
134	swap( newnode.type, iter->type->aggInst.aggregate );
135	swap( clone->type->forall, newnode.type->aggregate.params );
136	newnode.addQualifiers( clone );
137	swap( newnode.type, iter->type->aggInst.aggregate );
138	} else if ( iter->type->kind == TypeData::Function ) { // routines ?
139	swap( clone->type->forall, iter->type->forall );
140	iter->addQualifiers( clone );
141	} // if
142	} else { // just SC qualifiers
143	iter->addQualifiers( clone );
144	} // if
145	} // for
146	delete qualifiers;
147	} // distQual
148
149	// There is an ambiguity for inline generic-routine return-types and generic routines.
150	// forall( otype T ) struct S { int i; } bar( T ) {}
151	// Does the forall bind to the struct or the routine, and how would it be possible to explicitly specify the binding.
152	// forall( otype T ) struct S { int T; } forall( otype W ) bar( W ) {}
153	// Currently, the forall is associated with the routine, and the generic type has to be separately defined:
154	// forall( otype T ) struct S { int T; };
155	// forall( otype W ) bar( W ) {}
156
157	void rebindForall( DeclarationNode * declSpec, DeclarationNode * funcDecl ) {
158	if ( declSpec->type->kind == TypeData::Aggregate ) { // ignore aggregate definition
159	funcDecl->type->forall = declSpec->type->aggregate.params; // move forall from aggregate to function type
160	declSpec->type->aggregate.params = nullptr;
161	} // if
162	} // rebindForall
163
164	string * build_postfix_name( string * name ) {
165	name = string("__postfix_func_") + name;
166	return name;
167	} // build_postfix_name
168
169	DeclarationNode * fieldDecl( DeclarationNode * typeSpec, DeclarationNode * fieldList ) {
170	if ( ! fieldList ) { // field declarator ?
171	if ( ! ( typeSpec->type && (typeSpec->type->kind == TypeData::Aggregate \|\| typeSpec->type->kind == TypeData::Enum) ) ) {
172	stringstream ss;
173	typeSpec->type->print( ss );
174	SemanticWarning( yylloc, Warning::SuperfluousDecl, ss.str().c_str() );
175	return nullptr;
176	} // if
177	fieldList = DeclarationNode::newName( nullptr );
178	} // if
179	return distAttr( typeSpec, fieldList ); // mark all fields in list
180	} // fieldDecl
181
182	ForCtrl * forCtrl( ExpressionNode * type, string * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
183	ConstantExpr * constant = dynamic_cast<ConstantExpr *>(type->expr.get());
184	if ( constant && (constant->get_constant()->get_value() == "0" \|\| constant->get_constant()->get_value() == "1") ) {
185	type = new ExpressionNode( new CastExpr( maybeMoveBuild<Expression>(type), new BasicType( Type::Qualifiers(), BasicType::SignedInt ) ) );
186	} // if
187	// type = new ExpressionNode( build_func( new ExpressionNode( build_varref( new string( "__for_control_index_constraints__" ) ) ), type ) );
188	return new ForCtrl(
189	distAttr( DeclarationNode::newTypeof( type, true ), DeclarationNode::newName( index )->addInitializer( new InitializerNode( start ) ) ),
190	// NULL comp/inc => leave blank
191	comp ? new ExpressionNode( build_binary_val( compop, new ExpressionNode( build_varref( new string( *index ) ) ), comp ) ) : 0,
192	inc ? new ExpressionNode( build_binary_val( compop == OperKinds::LThan \|\| compop == OperKinds::LEThan ? // choose += or -= for upto/downto
193	OperKinds::PlusAssn : OperKinds::MinusAssn, new ExpressionNode( build_varref( new string( *index ) ) ), inc ) ) : 0 );
194	} // forCtrl
195
196	ForCtrl * forCtrl( ExpressionNode * type, ExpressionNode * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
197	if ( NameExpr * identifier = dynamic_cast<NameExpr *>(index->expr.get()) ) {
198	return forCtrl( type, new string( identifier->name ), start, compop, comp, inc );
199	} else if ( CommaExpr * commaExpr = dynamic_cast<CommaExpr *>(index->expr.get()) ) {
200	if ( NameExpr * identifier = dynamic_cast<NameExpr *>(commaExpr->arg1 ) ) {
201	return forCtrl( type, new string( identifier->name ), start, compop, comp, inc );
202	} else {
203	SemanticError( yylloc, "Expression disallowed. Only loop-index name allowed." ); return nullptr;
204	} // if
205	} else {
206	SemanticError( yylloc, "Expression disallowed. Only loop-index name allowed." ); return nullptr;
207	} // if
208	} // forCtrl
209
210	bool forall = false; // aggregate have one or more forall qualifiers ?
211
212	// https://www.gnu.org/software/bison/manual/bison.html#Location-Type
213	#define YYLLOC_DEFAULT(Cur, Rhs, N) \
214	if ( N ) { \
215	(Cur).first_line = YYRHSLOC( Rhs, 1 ).first_line; \
216	(Cur).first_column = YYRHSLOC( Rhs, 1 ).first_column; \
217	(Cur).last_line = YYRHSLOC( Rhs, N ).last_line; \
218	(Cur).last_column = YYRHSLOC( Rhs, N ).last_column; \
219	(Cur).filename = YYRHSLOC( Rhs, 1 ).filename; \
220	} else { \
221	(Cur).first_line = (Cur).last_line = YYRHSLOC( Rhs, 0 ).last_line; \
222	(Cur).first_column = (Cur).last_column = YYRHSLOC( Rhs, 0 ).last_column; \
223	(Cur).filename = YYRHSLOC( Rhs, 0 ).filename; \
224	}
225	%}
226
227	%define parse.error verbose
228
229	// Types declaration for productions
230	%union {
231	Token tok;
232	ParseNode * pn;
233	ExpressionNode * en;
234	DeclarationNode * decl;
235	AggregateDecl::Aggregate aggKey;
236	TypeDecl::Kind tclass;
237	StatementNode * sn;
238	WaitForStmt * wfs;
239	Expression * constant;
240	CondCtl * ifctl;
241	ForCtrl * fctl;
242	enum OperKinds compop;
243	LabelNode * label;
244	InitializerNode * in;
245	OperKinds op;
246	std::string * str;
247	bool flag;
248	CatchStmt::Kind catch_kind;
249	GenericExpr * genexpr;
250	}
251
252	//*********************** TERMINAL TOKENS ******************************
253
254	// keywords
255	%token TYPEDEF
256	%token EXTERN STATIC AUTO REGISTER
257	%token THREADLOCAL // C11
258	%token INLINE FORTRAN // C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
259	%token NORETURN // C11
260	%token CONST VOLATILE
261	%token RESTRICT // C99
262	%token ATOMIC // C11
263	%token FORALL MUTEX VIRTUAL VTABLE COERCE // CFA
264	%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED
265	%token BOOL COMPLEX IMAGINARY // C99
266	%token INT128 UINT128 uuFLOAT80 uuFLOAT128 // GCC
267	%token uFLOAT16 uFLOAT32 uFLOAT32X uFLOAT64 uFLOAT64X uFLOAT128 // GCC
268	%token DECIMAL32 DECIMAL64 DECIMAL128 // GCC
269	%token ZERO_T ONE_T // CFA
270	%token SIZEOF TYPEOF VALIST AUTO_TYPE // GCC
271	%token OFFSETOF BASETYPEOF TYPEID // CFA
272	%token ENUM STRUCT UNION
273	%token EXCEPTION // CFA
274	%token GENERATOR COROUTINE MONITOR THREAD // CFA
275	%token OTYPE FTYPE DTYPE TTYPE TRAIT // CFA
276	// %token RESUME // CFA
277	%token LABEL // GCC
278	%token SUSPEND // CFA
279	%token ATTRIBUTE EXTENSION // GCC
280	%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
281	%token CHOOSE FALLTHRU FALLTHROUGH WITH WHEN WAITFOR // CFA
282	%token DISABLE ENABLE TRY THROW THROWRESUME AT // CFA
283	%token ASM // C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
284	%token ALIGNAS ALIGNOF GENERIC STATICASSERT // C11
285
286	// names and constants: lexer differentiates between identifier and typedef names
287	%token<tok> IDENTIFIER QUOTED_IDENTIFIER TYPEDIMname TYPEDEFname TYPEGENname
288	%token<tok> TIMEOUT WOR CATCH RECOVER CATCHRESUME FIXUP FINALLY // CFA
289	%token<tok> INTEGERconstant CHARACTERconstant STRINGliteral
290	%token<tok> DIRECTIVE
291	// Floating point constant is broken into three kinds of tokens because of the ambiguity with tuple indexing and
292	// overloading constants 0/1, e.g., x.1 is lexed as (x)(.1), where (.1) is a factional constant, but is semantically
293	// converted into the tuple index (.)(1). e.g., 3.x
294	%token<tok> FLOATING_DECIMALconstant FLOATING_FRACTIONconstant FLOATINGconstant
295
296	// multi-character operators
297	%token ARROW // ->
298	%token ICR DECR // ++ --
299	%token LS RS // << >>
300	%token LE GE EQ NE // <= >= == !=
301	%token ANDAND OROR // && \|\|
302	%token ELLIPSIS // ...
303
304	%token EXPassign MULTassign DIVassign MODassign // \= *= /= %=
305	%token PLUSassign MINUSassign // += -=
306	%token LSassign RSassign // <<= >>=
307	%token ANDassign ERassign ORassign // &= ^= \|=
308
309	%token ErangeUpEq ErangeDown ErangeDownEq // ~= -~ -~=
310	%token ATassign // @=
311
312	%type<tok> identifier identifier_at identifier_or_type_name attr_name
313	%type<tok> quasi_keyword
314	%type<constant> string_literal
315	%type<str> string_literal_list
316
317	// expressions
318	%type<en> constant
319	%type<en> tuple tuple_expression_list
320	%type<op> ptrref_operator unary_operator assignment_operator simple_assignment_operator compound_assignment_operator
321	%type<en> primary_expression postfix_expression unary_expression
322	%type<en> cast_expression_list cast_expression exponential_expression multiplicative_expression additive_expression
323	%type<en> shift_expression relational_expression equality_expression
324	%type<en> AND_expression exclusive_OR_expression inclusive_OR_expression
325	%type<en> logical_AND_expression logical_OR_expression
326	%type<en> conditional_expression constant_expression assignment_expression assignment_expression_opt
327	%type<en> comma_expression comma_expression_opt
328	%type<en> argument_expression_list_opt argument_expression_list argument_expression default_initializer_opt
329	%type<ifctl> conditional_declaration
330	%type<fctl> for_control_expression for_control_expression_list
331	%type<compop> inclexcl
332	%type<en> subrange
333	%type<decl> asm_name_opt
334	%type<en> asm_operands_opt asm_operands_list asm_operand
335	%type<label> label_list
336	%type<en> asm_clobbers_list_opt
337	%type<flag> asm_volatile_opt
338	%type<en> handler_predicate_opt
339	%type<genexpr> generic_association generic_assoc_list
340
341	// statements
342	%type<sn> statement labeled_statement compound_statement
343	%type<sn> statement_decl statement_decl_list statement_list_nodecl
344	%type<sn> selection_statement if_statement
345	%type<sn> switch_clause_list_opt switch_clause_list
346	%type<en> case_value
347	%type<sn> case_clause case_value_list case_label case_label_list
348	%type<sn> iteration_statement jump_statement
349	%type<sn> expression_statement asm_statement
350	%type<sn> with_statement
351	%type<en> with_clause_opt
352	%type<sn> exception_statement handler_clause finally_clause
353	%type<catch_kind> handler_key
354	%type<sn> mutex_statement
355	%type<en> when_clause when_clause_opt waitfor timeout
356	%type<sn> waitfor_statement
357	%type<wfs> waitfor_clause
358
359	// declarations
360	%type<decl> abstract_declarator abstract_ptr abstract_array abstract_function array_dimension multi_array_dimension
361	%type<decl> abstract_parameter_declarator abstract_parameter_ptr abstract_parameter_array abstract_parameter_function array_parameter_dimension array_parameter_1st_dimension
362	%type<decl> abstract_parameter_declaration
363
364	%type<aggKey> aggregate_key aggregate_data aggregate_control
365	%type<decl> aggregate_type aggregate_type_nobody
366
367	%type<decl> assertion assertion_list assertion_list_opt
368
369	%type<en> bit_subrange_size_opt bit_subrange_size
370
371	%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type indirect_type
372	%type<decl> vtable vtable_opt default_opt
373
374	%type<decl> trait_declaration trait_declaration_list trait_declaring_list trait_specifier
375
376	%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
377	%type<decl> declaration_specifier declaration_specifier_nobody declarator declaring_list
378
379	%type<decl> elaborated_type elaborated_type_nobody
380
381	%type<decl> enumerator_list enum_type enum_type_nobody
382	%type<en> enumerator_value_opt
383
384	%type<decl> external_definition external_definition_list external_definition_list_opt
385
386	%type<decl> exception_declaration
387
388	%type<decl> field_declaration_list_opt field_declaration field_declaring_list_opt field_declarator field_abstract_list_opt field_abstract
389	%type<en> field field_name_list field_name fraction_constants_opt
390
391	%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr
392
393	%type<decl> identifier_parameter_declarator identifier_parameter_ptr identifier_parameter_array identifier_parameter_function
394	%type<decl> identifier_list
395
396	%type<decl> cfa_abstract_array cfa_abstract_declarator_no_tuple cfa_abstract_declarator_tuple
397	%type<decl> cfa_abstract_function cfa_abstract_parameter_declaration cfa_abstract_parameter_list
398	%type<decl> cfa_abstract_ptr cfa_abstract_tuple
399
400	%type<decl> cfa_array_parameter_1st_dimension
401
402	%type<decl> cfa_trait_declaring_list cfa_declaration cfa_field_declaring_list cfa_field_abstract_list
403	%type<decl> cfa_function_declaration cfa_function_return cfa_function_specifier
404
405	%type<decl> cfa_identifier_parameter_array cfa_identifier_parameter_declarator_no_tuple
406	%type<decl> cfa_identifier_parameter_declarator_tuple cfa_identifier_parameter_ptr
407
408	%type<decl> cfa_parameter_declaration cfa_parameter_list cfa_parameter_ellipsis_list_opt
409
410	%type<decl> cfa_typedef_declaration cfa_variable_declaration cfa_variable_specifier
411
412	%type<decl> c_declaration static_assert
413	%type<decl> KR_function_declarator KR_function_no_ptr KR_function_ptr KR_function_array
414	%type<decl> KR_parameter_list KR_parameter_list_opt
415
416	%type<decl> parameter_declaration parameter_list parameter_type_list_opt
417
418	%type<decl> paren_identifier paren_type
419
420	%type<decl> storage_class storage_class_list
421
422	%type<decl> sue_declaration_specifier sue_declaration_specifier_nobody sue_type_specifier sue_type_specifier_nobody
423
424	%type<tclass> type_class new_type_class
425	%type<decl> type_declarator type_declarator_name type_declaring_list
426
427	%type<decl> type_declaration_specifier type_type_specifier type_name typegen_name
428	%type<decl> typedef_name typedef_declaration typedef_expression
429
430	%type<decl> variable_type_redeclarator type_ptr type_array type_function
431
432	%type<decl> type_parameter_redeclarator type_parameter_ptr type_parameter_array type_parameter_function
433
434	%type<decl> type type_no_function
435	%type<decl> type_parameter type_parameter_list type_initializer_opt
436
437	%type<en> type_parameters_opt type_list
438
439	%type<decl> type_qualifier type_qualifier_name forall type_qualifier_list_opt type_qualifier_list
440	%type<decl> type_specifier type_specifier_nobody
441
442	%type<decl> variable_declarator variable_ptr variable_array variable_function
443	%type<decl> variable_abstract_declarator variable_abstract_ptr variable_abstract_array variable_abstract_function
444
445	%type<decl> attribute_list_opt attribute_list attribute attribute_name_list attribute_name
446
447	// initializers
448	%type<in> initializer initializer_list_opt initializer_opt
449
450	// designators
451	%type<en> designator designator_list designation
452
453
454	// Handle shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string is ambiguous:
455	// .---------. matches IF '(' comma_expression ')' statement . (reduce)
456	// if ( C ) S1 else S2
457	// `-----------------' matches IF '(' comma_expression ')' statement . (shift) ELSE statement */
458	// Similar issues exit with the waitfor statement.
459
460	// Order of these lines matters (low-to-high precedence). THEN is left associative over WOR/TIMEOUT/ELSE, WOR is left
461	// associative over TIMEOUT/ELSE, and TIMEOUT is left associative over ELSE.
462	%precedence THEN // rule precedence for IF/WAITFOR statement
463	%precedence WOR // token precedence for start of WOR in WAITFOR statement
464	%precedence TIMEOUT // token precedence for start of TIMEOUT in WAITFOR statement
465	%precedence CATCH // token precedence for start of TIMEOUT in WAITFOR statement
466	%precedence RECOVER // token precedence for start of TIMEOUT in WAITFOR statement
467	%precedence CATCHRESUME // token precedence for start of TIMEOUT in WAITFOR statement
468	%precedence FIXUP // token precedence for start of TIMEOUT in WAITFOR statement
469	%precedence FINALLY // token precedence for start of TIMEOUT in WAITFOR statement
470	%precedence ELSE // token precedence for start of else clause in IF/WAITFOR statement
471
472
473	// Handle shift/reduce conflict for generic type by shifting the '(' token. For example, this string is ambiguous:
474	// forall( otype T ) struct Foo { T v; };
475	// .-----. matches pointer to function returning a generic (which is impossible without a type)
476	// Foo ( *fp )( int );
477	// `---' matches start of TYPEGENname '('
478	// must be:
479	// Foo( int ) ( *fp )( int );
480	// The same problem occurs here:
481	// forall( otype T ) struct Foo { T v; } ( *fp )( int );
482	// must be:
483	// forall( otype T ) struct Foo { T v; } ( int ) ( *fp )( int );
484
485	// Order of these lines matters (low-to-high precedence).
486	%precedence TYPEGENname
487	%precedence '}'
488	%precedence '('
489
490	// %precedence RESUME
491	// %precedence '{'
492	// %precedence ')'
493
494	%locations // support location tracking for error messages
495
496	%start translation_unit // parse-tree root
497
498	%%
499	//*********************** Namespace Management ******************************
500
501	// The C grammar is not context free because it relies on the distinct terminal symbols "identifier" and "TYPEDEFname",
502	// which are lexically identical.
503	//
504	// typedef int foo; // identifier foo must now be scanned as TYPEDEFname
505	// foo f; // to allow it to appear in this context
506	//
507	// While it may be possible to write a purely context-free grammar, such a grammar would obscure the relationship
508	// between syntactic and semantic constructs. Cforall compounds this problem by introducing type names local to the
509	// scope of a declaration (for instance, those introduced through "forall" qualifiers), and by introducing "type
510	// generators" -- parameterized types. This latter type name creates a third class of identifiers, "TYPEGENname", which
511	// must be distinguished by the lexical scanner.
512	//
513	// Since the scanner cannot distinguish among the different classes of identifiers without some context information,
514	// there is a type table (typedefTable), which holds type names and identifiers that override type names, for each named
515	// scope. During parsing, semantic actions update the type table by adding new identifiers in the current scope. For
516	// each context that introduces a name scope, a new level is created in the type table and that level is popped on
517	// exiting the scope. Since type names can be local to a particular declaration, each declaration is itself a scope.
518	// This requires distinguishing between type names that are local to the current declaration scope and those that
519	// persist past the end of the declaration (i.e., names defined in "typedef" or "otype" declarations).
520	//
521	// The non-terminals "push" and "pop" denote the opening and closing of named scopes. Every push has a matching pop in
522	// the production rule. There are multiple lists of declarations, where each declaration is a named scope, so pop/push
523	// around the list separator.
524	//
525	// int f( forall(T) T (f1) T , forall( S ) S (f2)( S ) );
526	// push pop push pop
527
528	push:
529	{ typedefTable.enterScope(); }
530	;
531
532	pop:
533	{ typedefTable.leaveScope(); }
534	;
535
536	//*********************** CONSTANTS ******************************
537
538	constant:
539	// ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
540	INTEGERconstant { $$ = new ExpressionNode( build_constantInteger( *$1 ) ); }
541	\| FLOATING_DECIMALconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
542	\| FLOATING_FRACTIONconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
543	\| FLOATINGconstant { $$ = new ExpressionNode( build_constantFloat( *$1 ) ); }
544	\| CHARACTERconstant { $$ = new ExpressionNode( build_constantChar( *$1 ) ); }
545	;
546
547	quasi_keyword: // CFA
548	TIMEOUT
549	\| WOR
550	\| CATCH
551	\| RECOVER
552	\| CATCHRESUME
553	\| FIXUP
554	\| FINALLY
555	;
556
557	identifier:
558	IDENTIFIER
559	\| quasi_keyword
560	;
561
562	identifier_at:
563	identifier
564	\| '@' // CFA
565	{ Token tok = { new string( DeclarationNode::anonymous.newName() ), yylval.tok.loc }; $$ = tok; }
566	;
567
568	string_literal:
569	string_literal_list { $$ = build_constantStr( *$1 ); }
570	;
571
572	string_literal_list: // juxtaposed strings are concatenated
573	STRINGliteral { $$ = $1; } // conversion from tok to str
574	\| string_literal_list STRINGliteral
575	{
576	if ( ! appendStr( $1, $2 ) ) YYERROR; // append 2nd juxtaposed string to 1st
577	delete $2; // allocated by lexer
578	$$ = $1; // conversion from tok to str
579	}
580	;
581
582	//*********************** EXPRESSIONS ******************************
583
584	primary_expression:
585	IDENTIFIER // typedef name cannot be used as a variable name
586	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
587	\| quasi_keyword
588	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
589	\| TYPEDIMname // CFA, generic length argument
590	// { $$ = new ExpressionNode( new TypeExpr( maybeMoveBuildType( DeclarationNode::newFromTypedef( $1 ) ) ) ); }
591	// { $$ = new ExpressionNode( build_varref( $1 ) ); }
592	{ $$ = new ExpressionNode( build_dimensionref( $1 ) ); }
593	\| tuple
594	\| '(' comma_expression ')'
595	{ $$ = $2; }
596	\| '(' compound_statement ')' // GCC, lambda expression
597	{ $$ = new ExpressionNode( new StmtExpr( dynamic_cast<CompoundStmt *>(maybeMoveBuild<Statement>($2) ) ) ); }
598	\| type_name '.' identifier // CFA, nested type
599	{ SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
600	\| type_name '.' '[' field_name_list ']' // CFA, nested type / tuple field selector
601	{ SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
602	\| GENERIC '(' assignment_expression ',' generic_assoc_list ')' // C11
603	{
604	// add the missing control expression to the GenericExpr and return it
605	$5->control = maybeMoveBuild<Expression>( $3 );
606	$$ = new ExpressionNode( $5 );
607	}
608	// \| RESUME '(' comma_expression ')'
609	// { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
610	// \| RESUME '(' comma_expression ')' compound_statement
611	// { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
612	\| IDENTIFIER IDENTIFIER // syntax error
613	{
614	SemanticError( yylloc, ::toString( "Adjacent identifiers are not meaningful in an expression. "
615	"Possible problem is identifier \"", *$1.str,
616	"\" is a misspelled typename or an incorrectly specified type name, "
617	"e.g., missing generic parameter or missing struct/union/enum before typename." ) );
618	$$ = nullptr;
619	}
620	\| IDENTIFIER direct_type // syntax error
621	{
622	SemanticError( yylloc, ::toString( "Identifier \"", *$1.str, "\" cannot appear before a type. "
623	"Possible problem is misspelled storage or CV qualifier." ) );
624	$$ = nullptr;
625	}
626	;
627
628	generic_assoc_list: // C11
629	generic_association
630	\| generic_assoc_list ',' generic_association
631	{
632	// steal the association node from the singleton and delete the wrapper
633	$1->associations.splice($1->associations.end(), $3->associations);
634	delete $3;
635	$$ = $1;
636	}
637	;
638
639	generic_association: // C11
640	type_no_function ':' assignment_expression
641	{
642	// create a GenericExpr wrapper with one association pair
643	$$ = new GenericExpr( nullptr, { { maybeMoveBuildType($1), maybeMoveBuild<Expression>( $3 ) } } );
644	}
645	\| DEFAULT ':' assignment_expression
646	{ $$ = new GenericExpr( nullptr, { { maybeMoveBuild<Expression>( $3 ) } } ); }
647	;
648
649	postfix_expression:
650	primary_expression
651	\| postfix_expression '[' assignment_expression ',' tuple_expression_list ']'
652	// Historic, transitional: Disallow commas in subscripts.
653	// Switching to this behaviour may help check if a C compatibilty case uses comma-exprs in subscripts.
654	// Current: Commas in subscripts make tuples.
655	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Index, $1, new ExpressionNode( build_tuple( (ExpressionNode *)($3->set_last( $5 ) ) )) ) ); }
656	\| postfix_expression '[' assignment_expression ']'
657	// CFA, comma_expression disallowed in this context because it results in a common user error: subscripting a
658	// matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
659	// little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
660	// equivalent to the old x[i,j].
661	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Index, $1, $3 ) ); }
662	\| constant '[' assignment_expression ']' // 3[a], 'a'[a], 3.5[a]
663	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Index, $1, $3 ) ); }
664	\| string_literal '[' assignment_expression ']' // "abc"[3], 3["abc"]
665	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Index, new ExpressionNode( $1 ), $3 ) ); }
666	\| postfix_expression '{' argument_expression_list_opt '}' // CFA, constructor call
667	{
668	Token fn;
669	fn.str = new std::string( "?{}" ); // location undefined - use location of '{'?
670	$$ = new ExpressionNode( new ConstructorExpr( build_func( new ExpressionNode( build_varref( fn ) ), (ExpressionNode *)( $1 )->set_last( $3 ) ) ) );
671	}
672	\| postfix_expression '(' argument_expression_list_opt ')'
673	{ $$ = new ExpressionNode( build_func( $1, $3 ) ); }
674	\| postfix_expression '`' identifier // CFA, postfix call
675	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_varref( build_postfix_name( $3 ) ) ), $1 ) ); }
676	\| constant '`' identifier // CFA, postfix call
677	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_varref( build_postfix_name( $3 ) ) ), $1 ) ); }
678	\| string_literal '`' identifier // CFA, postfix call
679	{ $$ = new ExpressionNode( build_func( new ExpressionNode( build_varref( build_postfix_name( $3 ) ) ), new ExpressionNode( $1 ) ) ); }
680	\| postfix_expression '.' identifier
681	{ $$ = new ExpressionNode( build_fieldSel( $1, build_varref( $3 ) ) ); }
682	\| postfix_expression '.' INTEGERconstant // CFA, tuple index
683	{ $$ = new ExpressionNode( build_fieldSel( $1, build_constantInteger( *$3 ) ) ); }
684	\| postfix_expression FLOATING_FRACTIONconstant // CFA, tuple index
685	{ $$ = new ExpressionNode( build_fieldSel( $1, build_field_name_FLOATING_FRACTIONconstant( *$2 ) ) ); }
686	\| postfix_expression '.' '[' field_name_list ']' // CFA, tuple field selector
687	{ $$ = new ExpressionNode( build_fieldSel( $1, build_tuple( $4 ) ) ); }
688	\| postfix_expression '.' aggregate_control
689	{ $$ = new ExpressionNode( build_keyword_cast( $3, $1 ) ); }
690	\| postfix_expression ARROW identifier
691	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_varref( $3 ) ) ); }
692	\| postfix_expression ARROW INTEGERconstant // CFA, tuple index
693	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_constantInteger( *$3 ) ) ); }
694	\| postfix_expression ARROW '[' field_name_list ']' // CFA, tuple field selector
695	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_tuple( $4 ) ) ); }
696	\| postfix_expression ICR
697	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::IncrPost, $1 ) ); }
698	\| postfix_expression DECR
699	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::DecrPost, $1 ) ); }
700	\| '(' type_no_function ')' '{' initializer_list_opt comma_opt '}' // C99, compound-literal
701	{ $$ = new ExpressionNode( build_compoundLiteral( $2, new InitializerNode( $5, true ) ) ); }
702	\| '(' type_no_function ')' '@' '{' initializer_list_opt comma_opt '}' // CFA, explicit C compound-literal
703	{ $$ = new ExpressionNode( build_compoundLiteral( $2, (new InitializerNode( $6, true ))->set_maybeConstructed( false ) ) ); }
704	\| '^' primary_expression '{' argument_expression_list_opt '}' // CFA, destructor call
705	{
706	Token fn;
707	fn.str = new string( "^?{}" ); // location undefined
708	$$ = new ExpressionNode( build_func( new ExpressionNode( build_varref( fn ) ), (ExpressionNode *)( $2 )->set_last( $4 ) ) );
709	}
710	;
711
712	argument_expression_list_opt:
713	// empty
714	{ $$ = nullptr; }
715	\| argument_expression_list
716	;
717
718	argument_expression_list:
719	argument_expression
720	\| argument_expression_list_opt ',' argument_expression
721	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
722	;
723
724	argument_expression:
725	'@' // CFA, default parameter
726	{ SemanticError( yylloc, "Default parameter for argument is currently unimplemented." ); $$ = nullptr; }
727	// { $$ = new ExpressionNode( build_constantInteger( *new string( "2" ) ) ); }
728	\| assignment_expression
729	;
730
731	field_name_list: // CFA, tuple field selector
732	field
733	\| field_name_list ',' field { $$ = (ExpressionNode *)($1->set_last( $3 )); }
734	;
735
736	field: // CFA, tuple field selector
737	field_name
738	\| FLOATING_DECIMALconstant field
739	{ $$ = new ExpressionNode( build_fieldSel( new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( *$1 ) ), maybeMoveBuild<Expression>( $2 ) ) ); }
740	\| FLOATING_DECIMALconstant '[' field_name_list ']'
741	{ $$ = new ExpressionNode( build_fieldSel( new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( *$1 ) ), build_tuple( $3 ) ) ); }
742	\| field_name '.' field
743	{ $$ = new ExpressionNode( build_fieldSel( $1, maybeMoveBuild<Expression>( $3 ) ) ); }
744	\| field_name '.' '[' field_name_list ']'
745	{ $$ = new ExpressionNode( build_fieldSel( $1, build_tuple( $4 ) ) ); }
746	\| field_name ARROW field
747	{ $$ = new ExpressionNode( build_pfieldSel( $1, maybeMoveBuild<Expression>( $3 ) ) ); }
748	\| field_name ARROW '[' field_name_list ']'
749	{ $$ = new ExpressionNode( build_pfieldSel( $1, build_tuple( $4 ) ) ); }
750	;
751
752	field_name:
753	INTEGERconstant fraction_constants_opt
754	{ $$ = new ExpressionNode( build_field_name_fraction_constants( build_constantInteger( *$1 ), $2 ) ); }
755	\| FLOATINGconstant fraction_constants_opt
756	{ $$ = new ExpressionNode( build_field_name_fraction_constants( build_field_name_FLOATINGconstant( *$1 ), $2 ) ); }
757	\| identifier_at fraction_constants_opt // CFA, allow anonymous fields
758	{
759	$$ = new ExpressionNode( build_field_name_fraction_constants( build_varref( $1 ), $2 ) );
760	}
761	;
762
763	fraction_constants_opt:
764	// empty
765	{ $$ = nullptr; }
766	\| fraction_constants_opt FLOATING_FRACTIONconstant
767	{
768	Expression * constant = build_field_name_FLOATING_FRACTIONconstant( *$2 );
769	$$ = $1 != nullptr ? new ExpressionNode( build_fieldSel( $1, constant ) ) : new ExpressionNode( constant );
770	}
771	;
772
773	unary_expression:
774	postfix_expression
775	// first location where constant/string can have operator applied: sizeof 3/sizeof "abc" still requires
776	// semantics checks, e.g., ++3, 3--, *3, &&3
777	\| constant
778	\| string_literal
779	{ $$ = new ExpressionNode( $1 ); }
780	\| EXTENSION cast_expression // GCC
781	{ $$ = $2->set_extension( true ); }
782	// '*' ('&') is separated from unary_operator because of shift/reduce conflict in:
783	// { * X; } // dereference X
784	// { * int X; } // CFA declaration of pointer to int
785	\| ptrref_operator cast_expression // CFA
786	{
787	switch ( $1 ) {
788	case OperKinds::AddressOf:
789	$$ = new ExpressionNode( new AddressExpr( maybeMoveBuild<Expression>( $2 ) ) );
790	break;
791	case OperKinds::PointTo:
792	$$ = new ExpressionNode( build_unary_val( $1, $2 ) );
793	break;
794	case OperKinds::And:
795	$$ = new ExpressionNode( new AddressExpr( new AddressExpr( maybeMoveBuild<Expression>( $2 ) ) ) );
796	break;
797	default:
798	assert( false );
799	}
800	}
801	\| unary_operator cast_expression
802	{ $$ = new ExpressionNode( build_unary_val( $1, $2 ) ); }
803	\| ICR unary_expression
804	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::Incr, $2 ) ); }
805	\| DECR unary_expression
806	{ $$ = new ExpressionNode( build_unary_ptr( OperKinds::Decr, $2 ) ); }
807	\| SIZEOF unary_expression
808	{ $$ = new ExpressionNode( new SizeofExpr( maybeMoveBuild<Expression>( $2 ) ) ); }
809	\| SIZEOF '(' type_no_function ')'
810	{ $$ = new ExpressionNode( new SizeofExpr( maybeMoveBuildType( $3 ) ) ); }
811	\| ALIGNOF unary_expression // GCC, variable alignment
812	{ $$ = new ExpressionNode( new AlignofExpr( maybeMoveBuild<Expression>( $2 ) ) ); }
813	\| ALIGNOF '(' type_no_function ')' // GCC, type alignment
814	{ $$ = new ExpressionNode( new AlignofExpr( maybeMoveBuildType( $3 ) ) ); }
815	\| OFFSETOF '(' type_no_function ',' identifier ')'
816	{ $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) ); }
817	\| TYPEID '(' type_no_function ')'
818	{
819	SemanticError( yylloc, "typeid name is currently unimplemented." ); $$ = nullptr;
820	// $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) );
821	}
822	;
823
824	ptrref_operator:
825	'*' { $$ = OperKinds::PointTo; }
826	\| '&' { $$ = OperKinds::AddressOf; }
827	// GCC, address of label must be handled by semantic check for ref,ref,label
828	\| ANDAND { $$ = OperKinds::And; }
829	;
830
831	unary_operator:
832	'+' { $$ = OperKinds::UnPlus; }
833	\| '-' { $$ = OperKinds::UnMinus; }
834	\| '!' { $$ = OperKinds::Neg; }
835	\| '~' { $$ = OperKinds::BitNeg; }
836	;
837
838	cast_expression:
839	unary_expression
840	\| '(' type_no_function ')' cast_expression
841	{ $$ = new ExpressionNode( build_cast( $2, $4 ) ); }
842	\| '(' aggregate_control '&' ')' cast_expression // CFA
843	{ $$ = new ExpressionNode( build_keyword_cast( $2, $5 ) ); }
844	\| '(' aggregate_control '*' ')' cast_expression // CFA
845	{ $$ = new ExpressionNode( build_keyword_cast( $2, $5 ) ); }
846	\| '(' VIRTUAL ')' cast_expression // CFA
847	{ $$ = new ExpressionNode( new VirtualCastExpr( maybeMoveBuild<Expression>( $4 ), maybeMoveBuildType( nullptr ) ) ); }
848	\| '(' VIRTUAL type_no_function ')' cast_expression // CFA
849	{ $$ = new ExpressionNode( new VirtualCastExpr( maybeMoveBuild<Expression>( $5 ), maybeMoveBuildType( $3 ) ) ); }
850	\| '(' RETURN type_no_function ')' cast_expression // CFA
851	{ SemanticError( yylloc, "Return cast is currently unimplemented." ); $$ = nullptr; }
852	\| '(' COERCE type_no_function ')' cast_expression // CFA
853	{ SemanticError( yylloc, "Coerce cast is currently unimplemented." ); $$ = nullptr; }
854	\| '(' qualifier_cast_list ')' cast_expression // CFA
855	{ SemanticError( yylloc, "Qualifier cast is currently unimplemented." ); $$ = nullptr; }
856	// \| '(' type_no_function ')' tuple
857	// { $$ = new ExpressionNode( build_cast( $2, $4 ) ); }
858	;
859
860	qualifier_cast_list:
861	cast_modifier type_qualifier_name
862	\| cast_modifier MUTEX
863	\| qualifier_cast_list cast_modifier type_qualifier_name
864	\| qualifier_cast_list cast_modifier MUTEX
865	;
866
867	cast_modifier:
868	'-'
869	\| '+'
870	;
871
872	exponential_expression:
873	cast_expression
874	\| exponential_expression '\\' cast_expression
875	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Exp, $1, $3 ) ); }
876	;
877
878	multiplicative_expression:
879	exponential_expression
880	\| multiplicative_expression '*' exponential_expression
881	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Mul, $1, $3 ) ); }
882	\| multiplicative_expression '/' exponential_expression
883	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Div, $1, $3 ) ); }
884	\| multiplicative_expression '%' exponential_expression
885	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Mod, $1, $3 ) ); }
886	;
887
888	additive_expression:
889	multiplicative_expression
890	\| additive_expression '+' multiplicative_expression
891	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Plus, $1, $3 ) ); }
892	\| additive_expression '-' multiplicative_expression
893	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Minus, $1, $3 ) ); }
894	;
895
896	shift_expression:
897	additive_expression
898	\| shift_expression LS additive_expression
899	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LShift, $1, $3 ) ); }
900	\| shift_expression RS additive_expression
901	{ $$ = new ExpressionNode( build_binary_val( OperKinds::RShift, $1, $3 ) ); }
902	;
903
904	relational_expression:
905	shift_expression
906	\| relational_expression '<' shift_expression
907	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LThan, $1, $3 ) ); }
908	\| relational_expression '>' shift_expression
909	{ $$ = new ExpressionNode( build_binary_val( OperKinds::GThan, $1, $3 ) ); }
910	\| relational_expression LE shift_expression
911	{ $$ = new ExpressionNode( build_binary_val( OperKinds::LEThan, $1, $3 ) ); }
912	\| relational_expression GE shift_expression
913	{ $$ = new ExpressionNode( build_binary_val( OperKinds::GEThan, $1, $3 ) ); }
914	;
915
916	equality_expression:
917	relational_expression
918	\| equality_expression EQ relational_expression
919	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Eq, $1, $3 ) ); }
920	\| equality_expression NE relational_expression
921	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Neq, $1, $3 ) ); }
922	;
923
924	AND_expression:
925	equality_expression
926	\| AND_expression '&' equality_expression
927	{ $$ = new ExpressionNode( build_binary_val( OperKinds::BitAnd, $1, $3 ) ); }
928	;
929
930	exclusive_OR_expression:
931	AND_expression
932	\| exclusive_OR_expression '^' AND_expression
933	{ $$ = new ExpressionNode( build_binary_val( OperKinds::Xor, $1, $3 ) ); }
934	;
935
936	inclusive_OR_expression:
937	exclusive_OR_expression
938	\| inclusive_OR_expression '\|' exclusive_OR_expression
939	{ $$ = new ExpressionNode( build_binary_val( OperKinds::BitOr, $1, $3 ) ); }
940	;
941
942	logical_AND_expression:
943	inclusive_OR_expression
944	\| logical_AND_expression ANDAND inclusive_OR_expression
945	{ $$ = new ExpressionNode( build_and_or( $1, $3, true ) ); }
946	;
947
948	logical_OR_expression:
949	logical_AND_expression
950	\| logical_OR_expression OROR logical_AND_expression
951	{ $$ = new ExpressionNode( build_and_or( $1, $3, false ) ); }
952	;
953
954	conditional_expression:
955	logical_OR_expression
956	\| logical_OR_expression '?' comma_expression ':' conditional_expression
957	{ $$ = new ExpressionNode( build_cond( $1, $3, $5 ) ); }
958	// FIX ME: computes $1 twice
959	\| logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
960	{ $$ = new ExpressionNode( build_cond( $1, $1, $4 ) ); }
961	;
962
963	constant_expression:
964	conditional_expression
965	;
966
967	assignment_expression:
968	// CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
969	conditional_expression
970	\| unary_expression assignment_operator assignment_expression
971	{
972	// if ( $2 == OperKinds::AtAssn ) {
973	// SemanticError( yylloc, "C @= assignment is currently unimplemented." ); $$ = nullptr;
974	// } else {
975	$$ = new ExpressionNode( build_binary_val( $2, $1, $3 ) );
976	// } // if
977	}
978	\| unary_expression '=' '{' initializer_list_opt comma_opt '}'
979	{ SemanticError( yylloc, "Initializer assignment is currently unimplemented." ); $$ = nullptr; }
980	;
981
982	assignment_expression_opt:
983	// empty
984	{ $$ = nullptr; }
985	\| assignment_expression
986	;
987
988	assignment_operator:
989	simple_assignment_operator
990	\| compound_assignment_operator
991	;
992
993	simple_assignment_operator:
994	'=' { $$ = OperKinds::Assign; }
995	\| ATassign { $$ = OperKinds::AtAssn; } // CFA
996	;
997
998	compound_assignment_operator:
999	EXPassign { $$ = OperKinds::ExpAssn; }
1000	\| MULTassign { $$ = OperKinds::MulAssn; }
1001	\| DIVassign { $$ = OperKinds::DivAssn; }
1002	\| MODassign { $$ = OperKinds::ModAssn; }
1003	\| PLUSassign { $$ = OperKinds::PlusAssn; }
1004	\| MINUSassign { $$ = OperKinds::MinusAssn; }
1005	\| LSassign { $$ = OperKinds::LSAssn; }
1006	\| RSassign { $$ = OperKinds::RSAssn; }
1007	\| ANDassign { $$ = OperKinds::AndAssn; }
1008	\| ERassign { $$ = OperKinds::ERAssn; }
1009	\| ORassign { $$ = OperKinds::OrAssn; }
1010	;
1011
1012	tuple: // CFA, tuple
1013	// CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
1014	// comma_expression in cfa_identifier_parameter_array and cfa_abstract_array
1015	// '[' ']'
1016	// { $$ = new ExpressionNode( build_tuple() ); }
1017	// \| '[' push assignment_expression pop ']'
1018	// { $$ = new ExpressionNode( build_tuple( $3 ) ); }
1019	'[' ',' tuple_expression_list ']'
1020	{ $$ = new ExpressionNode( build_tuple( (ExpressionNode *)(new ExpressionNode( nullptr ) )->set_last( $3 ) ) ); }
1021	\| '[' push assignment_expression pop ',' tuple_expression_list ']'
1022	{ $$ = new ExpressionNode( build_tuple( (ExpressionNode *)($3->set_last( $6 ) ) )); }
1023	;
1024
1025	tuple_expression_list:
1026	assignment_expression
1027	\| '@' // CFA
1028	{ SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1029	\| tuple_expression_list ',' assignment_expression
1030	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
1031	\| tuple_expression_list ',' '@'
1032	{ SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1033	;
1034
1035	comma_expression:
1036	assignment_expression
1037	\| comma_expression ',' assignment_expression
1038	{ $$ = new ExpressionNode( new CommaExpr( maybeMoveBuild<Expression>( $1 ), maybeMoveBuild<Expression>( $3 ) ) ); }
1039	;
1040
1041	comma_expression_opt:
1042	// empty
1043	{ $$ = nullptr; }
1044	\| comma_expression
1045	;
1046
1047	//************************* STATEMENTS *****************************
1048
1049	statement:
1050	labeled_statement
1051	\| compound_statement
1052	\| expression_statement
1053	\| selection_statement
1054	\| iteration_statement
1055	\| jump_statement
1056	\| with_statement
1057	\| mutex_statement
1058	\| waitfor_statement
1059	\| exception_statement
1060	\| enable_disable_statement
1061	{ SemanticError( yylloc, "enable/disable statement is currently unimplemented." ); $$ = nullptr; }
1062	\| asm_statement
1063	\| DIRECTIVE
1064	{ $$ = new StatementNode( build_directive( $1 ) ); }
1065	;
1066
1067	labeled_statement:
1068	// labels cannot be identifiers 0 or 1
1069	identifier_or_type_name ':' attribute_list_opt statement
1070	{ $$ = $4->add_label( $1, $3 ); }
1071	\| identifier_or_type_name ':' attribute_list_opt error // syntax error
1072	{
1073	SemanticError( yylloc, ::toString( "Label \"", *$1.str, "\" must be associated with a statement, "
1074	"where a declaration, case, or default is not a statement. "
1075	"Move the label or terminate with a semi-colon." ) );
1076	$$ = nullptr;
1077	}
1078	;
1079
1080	compound_statement:
1081	'{' '}'
1082	{ $$ = new StatementNode( build_compound( (StatementNode *)0 ) ); }
1083	\| '{' push
1084	local_label_declaration_opt // GCC, local labels appear at start of block
1085	statement_decl_list // C99, intermix declarations and statements
1086	pop '}'
1087	{ $$ = new StatementNode( build_compound( $4 ) ); }
1088	;
1089
1090	statement_decl_list: // C99
1091	statement_decl
1092	\| statement_decl_list statement_decl
1093	{ assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1094	;
1095
1096	statement_decl:
1097	declaration // CFA, new & old style declarations
1098	{ $$ = new StatementNode( $1 ); }
1099	\| EXTENSION declaration // GCC
1100	{ distExt( $2 ); $$ = new StatementNode( $2 ); }
1101	\| function_definition
1102	{ $$ = new StatementNode( $1 ); }
1103	\| EXTENSION function_definition // GCC
1104	{ distExt( $2 ); $$ = new StatementNode( $2 ); }
1105	\| statement
1106	;
1107
1108	statement_list_nodecl:
1109	statement
1110	\| statement_list_nodecl statement
1111	{ assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1112	\| statement_list_nodecl error // syntax error
1113	{ SemanticError( yylloc, "Declarations only allowed at the start of the switch body, i.e., after the '{'." ); $$ = nullptr; }
1114	;
1115
1116	expression_statement:
1117	comma_expression_opt ';'
1118	{ $$ = new StatementNode( build_expr( $1 ) ); }
1119	\| MUTEX '(' ')' comma_expression ';'
1120	{ $$ = new StatementNode( build_mutex( nullptr, new StatementNode( build_expr( $4 ) ) ) ); }
1121	;
1122
1123	selection_statement:
1124	// pop causes a S/R conflict without separating the IF statement into a non-terminal even after resolving
1125	// the inherent S/R conflict with THEN/ELSE.
1126	push if_statement pop
1127	{ $$ = $2; }
1128	\| SWITCH '(' comma_expression ')' case_clause
1129	{ $$ = new StatementNode( build_switch( true, $3, $5 ) ); }
1130	\| SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1131	{
1132	StatementNode *sw = new StatementNode( build_switch( true, $3, $8 ) );
1133	// The semantics of the declaration list is changed to include associated initialization, which is performed
1134	// before the transfer to the appropriate case clause by hoisting the declarations into a compound
1135	// statement around the switch. Statements after the initial declaration list can never be executed, and
1136	// therefore, are removed from the grammar even though C allows it. The change also applies to choose
1137	// statement.
1138	$$ = $7 ? new StatementNode( build_compound( (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1139	}
1140	\| SWITCH '(' comma_expression ')' '{' error '}' // CFA, syntax error
1141	{ SemanticError( yylloc, "Only declarations can appear before the list of case clauses." ); $$ = nullptr; }
1142	\| CHOOSE '(' comma_expression ')' case_clause // CFA
1143	{ $$ = new StatementNode( build_switch( false, $3, $5 ) ); }
1144	\| CHOOSE '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1145	{
1146	StatementNode *sw = new StatementNode( build_switch( false, $3, $8 ) );
1147	$$ = $7 ? new StatementNode( build_compound( (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1148	}
1149	\| CHOOSE '(' comma_expression ')' '{' error '}' // CFA, syntax error
1150	{ SemanticError( yylloc, "Only declarations can appear before the list of case clauses." ); $$ = nullptr; }
1151	;
1152
1153	if_statement:
1154	IF '(' conditional_declaration ')' statement %prec THEN
1155	// explicitly deal with the shift/reduce conflict on if/else
1156	{ $$ = new StatementNode( build_if( $3, maybe_build_compound( $5 ), nullptr ) ); }
1157	\| IF '(' conditional_declaration ')' statement ELSE statement
1158	{ $$ = new StatementNode( build_if( $3, maybe_build_compound( $5 ), maybe_build_compound( $7 ) ) ); }
1159	;
1160
1161	conditional_declaration:
1162	comma_expression
1163	{ $$ = new CondCtl( nullptr, $1 ); }
1164	\| c_declaration // no semi-colon
1165	{ $$ = new CondCtl( $1, nullptr ); }
1166	\| cfa_declaration // no semi-colon
1167	{ $$ = new CondCtl( $1, nullptr ); }
1168	\| declaration comma_expression // semi-colon separated
1169	{ $$ = new CondCtl( $1, $2 ); }
1170	;
1171
1172	// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
1173	// clause allows a list of values and subranges.
1174
1175	case_value: // CFA
1176	constant_expression { $$ = $1; }
1177	\| constant_expression ELLIPSIS constant_expression // GCC, subrange
1178	{ $$ = new ExpressionNode( new RangeExpr( maybeMoveBuild<Expression>( $1 ), maybeMoveBuild<Expression>( $3 ) ) ); }
1179	\| subrange // CFA, subrange
1180	;
1181
1182	case_value_list: // CFA
1183	case_value { $$ = new StatementNode( build_case( $1 ) ); }
1184	// convert case list, e.g., "case 1, 3, 5:" into "case 1: case 3: case 5"
1185	\| case_value_list ',' case_value { $$ = (StatementNode *)($1->set_last( new StatementNode( build_case( $3 ) ) ) ); }
1186	;
1187
1188	case_label: // CFA
1189	CASE error // syntax error
1190	{ SemanticError( yylloc, "Missing case list after case." ); $$ = nullptr; }
1191	\| CASE case_value_list ':' { $$ = $2; }
1192	\| CASE case_value_list error // syntax error
1193	{ SemanticError( yylloc, "Missing colon after case list." ); $$ = nullptr; }
1194	\| DEFAULT ':' { $$ = new StatementNode( build_default() ); }
1195	// A semantic check is required to ensure only one default clause per switch/choose statement.
1196	\| DEFAULT error // syntax error
1197	{ SemanticError( yylloc, "Missing colon after default." ); $$ = nullptr; }
1198	;
1199
1200	case_label_list: // CFA
1201	case_label
1202	\| case_label_list case_label { $$ = (StatementNode *)( $1->set_last( $2 )); }
1203	;
1204
1205	case_clause: // CFA
1206	case_label_list statement { $$ = $1->append_last_case( maybe_build_compound( $2 ) ); }
1207	;
1208
1209	switch_clause_list_opt: // CFA
1210	// empty
1211	{ $$ = nullptr; }
1212	\| switch_clause_list
1213	;
1214
1215	switch_clause_list: // CFA
1216	case_label_list statement_list_nodecl
1217	{ $$ = $1->append_last_case( new StatementNode( build_compound( $2 ) ) ); }
1218	\| switch_clause_list case_label_list statement_list_nodecl
1219	{ $$ = (StatementNode *)( $1->set_last( $2->append_last_case( new StatementNode( build_compound( $3 ) ) ) ) ); }
1220	;
1221
1222	iteration_statement:
1223	WHILE '(' ')' statement // CFA => while ( 1 )
1224	{ $$ = new StatementNode( build_while( new CondCtl( nullptr, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ), maybe_build_compound( $4 ) ) ); }
1225	\| WHILE '(' conditional_declaration ')' statement %prec THEN
1226	{ $$ = new StatementNode( build_while( $3, maybe_build_compound( $5 ) ) ); }
1227	\| WHILE '(' conditional_declaration ')' statement ELSE statement // CFA
1228	{ $$ = new StatementNode( build_while( $3, maybe_build_compound( $5 ), $7 ) ); }
1229	\| DO statement WHILE '(' ')' ';' // CFA => do while( 1 )
1230	{ $$ = new StatementNode( build_do_while( new ExpressionNode( build_constantInteger( *new string( "1" ) ) ), maybe_build_compound( $2 ) ) ); }
1231	\| DO statement WHILE '(' comma_expression ')' ';' %prec THEN
1232	{ $$ = new StatementNode( build_do_while( $5, maybe_build_compound( $2 ) ) ); }
1233	\| DO statement WHILE '(' comma_expression ')' ELSE statement // CFA
1234	{ $$ = new StatementNode( build_do_while( $5, maybe_build_compound( $2 ), $8 ) ); }
1235	\| FOR '(' ')' statement // CFA => for ( ;; )
1236	{ $$ = new StatementNode( build_for( new ForCtrl( (ExpressionNode * )nullptr, (ExpressionNode * )nullptr, (ExpressionNode * )nullptr ), maybe_build_compound( $4 ) ) ); }
1237	\| FOR '(' for_control_expression_list ')' statement %prec THEN
1238	{ $$ = new StatementNode( build_for( $3, maybe_build_compound( $5 ) ) ); }
1239	\| FOR '(' for_control_expression_list ')' statement ELSE statement // CFA
1240	{ $$ = new StatementNode( build_for( $3, maybe_build_compound( $5 ), $7 ) ); }
1241	;
1242
1243	for_control_expression_list:
1244	for_control_expression
1245	\| for_control_expression_list ':' for_control_expression
1246	// ForCtrl + ForCtrl:
1247	// init + init => multiple declaration statements that are hoisted
1248	// condition + condition => (expression) && (expression)
1249	// change + change => (expression), (expression)
1250	{
1251	$1->init->set_last( $3->init );
1252	if ( $1->condition ) {
1253	if ( $3->condition ) {
1254	$1->condition->expr.reset( new LogicalExpr( $1->condition->expr.release(), $3->condition->expr.release(), true ) );
1255	} // if
1256	} else $1->condition = $3->condition;
1257	if ( $1->change ) {
1258	if ( $3->change ) {
1259	$1->change->expr.reset( new CommaExpr( $1->change->expr.release(), $3->change->expr.release() ) );
1260	} // if
1261	} else $1->change = $3->change;
1262	$$ = $1;
1263	}
1264	;
1265
1266	for_control_expression:
1267	';' comma_expression_opt ';' comma_expression_opt
1268	{ $$ = new ForCtrl( (ExpressionNode * )nullptr, $2, $4 ); }
1269	\| comma_expression ';' comma_expression_opt ';' comma_expression_opt
1270	{ $$ = new ForCtrl( $1, $3, $5 ); }
1271	\| declaration comma_expression_opt ';' comma_expression_opt // C99, declaration has ';'
1272	{ $$ = new ForCtrl( $1, $2, $4 ); }
1273
1274	\| comma_expression // CFA
1275	{ $$ = forCtrl( $1, new string( DeclarationNode::anonymous.newName() ), new ExpressionNode( build_constantInteger( *new string( "0" ) ) ),
1276	OperKinds::LThan, $1->clone(), new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1277	\| '=' comma_expression // CFA
1278	{ $$ = forCtrl( $2, new string( DeclarationNode::anonymous.newName() ), new ExpressionNode( build_constantInteger( *new string( "0" ) ) ),
1279	OperKinds::LEThan, $2->clone(), new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1280	\| comma_expression inclexcl comma_expression // CFA
1281	{ $$ = forCtrl( $1, new string( DeclarationNode::anonymous.newName() ), $1->clone(), $2, $3, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1282	\| comma_expression inclexcl comma_expression '~' comma_expression // CFA
1283	{ $$ = forCtrl( $1, new string( DeclarationNode::anonymous.newName() ), $1->clone(), $2, $3, $5 ); }
1284	\| comma_expression ';' // CFA
1285	{ $$ = forCtrl( new ExpressionNode( build_constantInteger( *new string( "0u" ) ) ), $1, nullptr, OperKinds::LThan, nullptr, nullptr ); }
1286	\| comma_expression ';' comma_expression // CFA
1287	{ $$ = forCtrl( $3, $1, new ExpressionNode( build_constantInteger( *new string( "0" ) ) ),
1288	OperKinds::LThan, $3->clone(), new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1289	\| comma_expression ';' '=' comma_expression // CFA
1290	{ $$ = forCtrl( $4, $1, new ExpressionNode( build_constantInteger( *new string( "0" ) ) ),
1291	OperKinds::LEThan, $4->clone(), new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1292	\| comma_expression ';' comma_expression inclexcl comma_expression // CFA
1293	{ $$ = forCtrl( $3, $1, $3->clone(), $4, $5, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1294	\| comma_expression ';' comma_expression inclexcl comma_expression '~' comma_expression // CFA
1295	{ $$ = forCtrl( $3, $1, $3->clone(), $4, $5, $7 ); }
1296
1297	\| comma_expression ';' TYPEDEFname // CFA, array type
1298	{
1299	SemanticError( yylloc, "Array interator is currently unimplemented." ); $$ = nullptr;
1300	$$ = forCtrl( new ExpressionNode( build_varref( $3 ) ), $1, nullptr, OperKinds::Range, nullptr, nullptr );
1301	}
1302
1303	// There is a S/R conflicit if ~ and -~ are factored out.
1304	\| comma_expression ';' comma_expression '~' '@' // CFA
1305	{ $$ = forCtrl( $3, $1, $3->clone(), OperKinds::LThan, nullptr, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1306	\| comma_expression ';' comma_expression ErangeDown '@' // CFA
1307	{ $$ = forCtrl( $3, $1, $3->clone(), OperKinds::GThan, nullptr, new ExpressionNode( build_constantInteger( *new string( "1" ) ) ) ); }
1308	\| comma_expression ';' comma_expression '~' '@' '~' comma_expression // CFA
1309	{ $$ = forCtrl( $3, $1, $3->clone(), OperKinds::LThan, nullptr, $7 ); }
1310	\| comma_expression ';' comma_expression ErangeDown '@' '~' comma_expression // CFA
1311	{ $$ = forCtrl( $3, $1, $3->clone(), OperKinds::GThan, nullptr, $7 ); }
1312	\| comma_expression ';' comma_expression '~' '@' '~' '@' // CFA
1313	{ $$ = forCtrl( $3, $1, $3->clone(), OperKinds::LThan, nullptr, nullptr ); }
1314	;
1315
1316	inclexcl:
1317	'~'
1318	{ $$ = OperKinds::LThan; }
1319	\| ErangeUpEq
1320	{ $$ = OperKinds::LEThan; }
1321	\| ErangeDown
1322	{ $$ = OperKinds::GThan; }
1323	\| ErangeDownEq
1324	{ $$ = OperKinds::GEThan; }
1325	;
1326
1327	jump_statement:
1328	GOTO identifier_or_type_name ';'
1329	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Goto ) ); }
1330	\| GOTO '*' comma_expression ';' // GCC, computed goto
1331	// The syntax for the GCC computed goto violates normal expression precedence, e.g., goto i+3; => goto (i+3);
1332	// whereas normal operator precedence yields goto (*i)+3;
1333	{ $$ = new StatementNode( build_computedgoto( $3 ) ); }
1334	// A semantic check is required to ensure fallthru appears only in the body of a choose statement.
1335	\| fall_through_name ';' // CFA
1336	{ $$ = new StatementNode( build_branch( BranchStmt::FallThrough ) ); }
1337	\| fall_through_name identifier_or_type_name ';' // CFA
1338	{ $$ = new StatementNode( build_branch( $2, BranchStmt::FallThrough ) ); }
1339	\| fall_through_name DEFAULT ';' // CFA
1340	{ $$ = new StatementNode( build_branch( BranchStmt::FallThroughDefault ) ); }
1341	\| CONTINUE ';'
1342	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1343	{ $$ = new StatementNode( build_branch( BranchStmt::Continue ) ); }
1344	\| CONTINUE identifier_or_type_name ';' // CFA, multi-level continue
1345	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1346	// the target of the transfer appears only at the start of an iteration statement.
1347	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Continue ) ); }
1348	\| BREAK ';'
1349	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1350	{ $$ = new StatementNode( build_branch( BranchStmt::Break ) ); }
1351	\| BREAK identifier_or_type_name ';' // CFA, multi-level exit
1352	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1353	// the target of the transfer appears only at the start of an iteration statement.
1354	{ $$ = new StatementNode( build_branch( $2, BranchStmt::Break ) ); }
1355	\| RETURN comma_expression_opt ';'
1356	{ $$ = new StatementNode( build_return( $2 ) ); }
1357	\| RETURN '{' initializer_list_opt comma_opt '}' ';'
1358	{ SemanticError( yylloc, "Initializer return is currently unimplemented." ); $$ = nullptr; }
1359	\| SUSPEND ';'
1360	{ $$ = new StatementNode( build_suspend( nullptr ) ); }
1361	\| SUSPEND compound_statement
1362	{ $$ = new StatementNode( build_suspend( $2 ) ); }
1363	\| SUSPEND COROUTINE ';'
1364	{ $$ = new StatementNode( build_suspend( nullptr, SuspendStmt::Coroutine ) ); }
1365	\| SUSPEND COROUTINE compound_statement
1366	{ $$ = new StatementNode( build_suspend( $3, SuspendStmt::Coroutine ) ); }
1367	\| SUSPEND GENERATOR ';'
1368	{ $$ = new StatementNode( build_suspend( nullptr, SuspendStmt::Generator ) ); }
1369	\| SUSPEND GENERATOR compound_statement
1370	{ $$ = new StatementNode( build_suspend( $3, SuspendStmt::Generator ) ); }
1371	\| THROW assignment_expression_opt ';' // handles rethrow
1372	{ $$ = new StatementNode( build_throw( $2 ) ); }
1373	\| THROWRESUME assignment_expression_opt ';' // handles reresume
1374	{ $$ = new StatementNode( build_resume( $2 ) ); }
1375	\| THROWRESUME assignment_expression_opt AT assignment_expression ';' // handles reresume
1376	{ $$ = new StatementNode( build_resume_at( $2, $4 ) ); }
1377	;
1378
1379	fall_through_name: // CFA
1380	FALLTHRU
1381	\| FALLTHROUGH
1382	;
1383
1384	with_statement:
1385	WITH '(' tuple_expression_list ')' statement
1386	{ $$ = new StatementNode( build_with( $3, $5 ) ); }
1387	;
1388
1389	// If MUTEX becomes a general qualifier, there are shift/reduce conflicts, so change syntax to "with mutex".
1390	mutex_statement:
1391	MUTEX '(' argument_expression_list ')' statement
1392	{ $$ = new StatementNode( build_mutex( $3, $5 ) ); }
1393	;
1394
1395	when_clause:
1396	WHEN '(' comma_expression ')' { $$ = $3; }
1397	;
1398
1399	when_clause_opt:
1400	// empty
1401	{ $$ = nullptr; }
1402	\| when_clause
1403	;
1404
1405	waitfor:
1406	WAITFOR '(' cast_expression ')'
1407	{ $$ = $3; }
1408	// \| WAITFOR '(' cast_expression ',' argument_expression_list_opt ')'
1409	// { $$ = (ExpressionNode *)$3->set_last( $5 ); }
1410	\| WAITFOR '(' cast_expression_list ':' argument_expression_list_opt ')'
1411	{ $$ = (ExpressionNode *)($3->set_last( $5 )); }
1412	;
1413
1414	cast_expression_list:
1415	cast_expression
1416	\| cast_expression_list ',' cast_expression
1417	// { $$ = (ExpressionNode *)($1->set_last( $3 )); }
1418	{ SemanticError( yylloc, "List of mutex member is currently unimplemented." ); $$ = nullptr; }
1419	;
1420
1421	timeout:
1422	TIMEOUT '(' comma_expression ')' { $$ = $3; }
1423	;
1424
1425	waitfor_clause:
1426	when_clause_opt waitfor statement %prec THEN
1427	{ $$ = build_waitfor( $2, maybe_build_compound( $3 ), $1 ); }
1428	\| when_clause_opt waitfor statement WOR waitfor_clause
1429	{ $$ = build_waitfor( $2, maybe_build_compound( $3 ), $1, $5 ); }
1430	\| when_clause_opt timeout statement %prec THEN
1431	{ $$ = build_waitfor_timeout( $2, maybe_build_compound( $3 ), $1 ); }
1432	\| when_clause_opt ELSE statement
1433	{ $$ = build_waitfor_timeout( nullptr, maybe_build_compound( $3 ), $1 ); }
1434	// "else" must be conditional after timeout or timeout is never triggered (i.e., it is meaningless)
1435	\| when_clause_opt timeout statement WOR ELSE statement // syntax error
1436	{ SemanticError( yylloc, "else clause must be conditional after timeout or timeout never triggered." ); $$ = nullptr; }
1437	\| when_clause_opt timeout statement WOR when_clause ELSE statement
1438	{ $$ = build_waitfor_timeout( $2, maybe_build_compound( $3 ), $1, maybe_build_compound( $7 ), $5 ); }
1439	;
1440
1441	waitfor_statement:
1442	when_clause_opt waitfor statement %prec THEN
1443	{ $$ = new StatementNode( build_waitfor( $2, $3, $1 ) ); }
1444	\| when_clause_opt waitfor statement WOR waitfor_clause
1445	{ $$ = new StatementNode( build_waitfor( $2, $3, $1, $5 ) ); }
1446	;
1447
1448	exception_statement:
1449	TRY compound_statement handler_clause %prec THEN
1450	{ $$ = new StatementNode( build_try( $2, $3, 0 ) ); }
1451	\| TRY compound_statement finally_clause
1452	{ $$ = new StatementNode( build_try( $2, 0, $3 ) ); }
1453	\| TRY compound_statement handler_clause finally_clause
1454	{ $$ = new StatementNode( build_try( $2, $3, $4 ) ); }
1455	;
1456
1457	handler_clause:
1458	handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement
1459	{ $$ = new StatementNode( build_catch( $1, $4, $6, $8 ) ); }
1460	\| handler_clause handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement
1461	{ $$ = (StatementNode *)$1->set_last( new StatementNode( build_catch( $2, $5, $7, $9 ) ) ); }
1462	;
1463
1464	handler_predicate_opt:
1465	// empty
1466	{ $$ = nullptr; }
1467	\| ';' conditional_expression { $$ = $2; }
1468	;
1469
1470	handler_key:
1471	CATCH { $$ = CatchStmt::Terminate; }
1472	\| RECOVER { $$ = CatchStmt::Terminate; }
1473	\| CATCHRESUME { $$ = CatchStmt::Resume; }
1474	\| FIXUP { $$ = CatchStmt::Resume; }
1475	;
1476
1477	finally_clause:
1478	FINALLY compound_statement { $$ = new StatementNode( build_finally( $2 ) ); }
1479	;
1480
1481	exception_declaration:
1482	// No SUE declaration in parameter list.
1483	type_specifier_nobody
1484	\| type_specifier_nobody declarator
1485	{ $$ = $2->addType( $1 ); }
1486	\| type_specifier_nobody variable_abstract_declarator
1487	{ $$ = $2->addType( $1 ); }
1488	\| cfa_abstract_declarator_tuple identifier // CFA
1489	{ $$ = $1->addName( $2 ); }
1490	\| cfa_abstract_declarator_tuple // CFA
1491	;
1492
1493	enable_disable_statement:
1494	enable_disable_key identifier_list compound_statement
1495	;
1496
1497	enable_disable_key:
1498	ENABLE
1499	\| DISABLE
1500	;
1501
1502	asm_statement:
1503	ASM asm_volatile_opt '(' string_literal ')' ';'
1504	{ $$ = new StatementNode( build_asm( $2, $4, 0 ) ); }
1505	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ')' ';' // remaining GCC
1506	{ $$ = new StatementNode( build_asm( $2, $4, $6 ) ); }
1507	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ')' ';'
1508	{ $$ = new StatementNode( build_asm( $2, $4, $6, $8 ) ); }
1509	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
1510	{ $$ = new StatementNode( build_asm( $2, $4, $6, $8, $10 ) ); }
1511	\| ASM asm_volatile_opt GOTO '(' string_literal ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
1512	{ $$ = new StatementNode( build_asm( $2, $5, 0, $8, $10, $12 ) ); }
1513	;
1514
1515	asm_volatile_opt: // GCC
1516	// empty
1517	{ $$ = false; }
1518	\| VOLATILE
1519	{ $$ = true; }
1520	;
1521
1522	asm_operands_opt: // GCC
1523	// empty
1524	{ $$ = nullptr; } // use default argument
1525	\| asm_operands_list
1526	;
1527
1528	asm_operands_list: // GCC
1529	asm_operand
1530	\| asm_operands_list ',' asm_operand
1531	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
1532	;
1533
1534	asm_operand: // GCC
1535	string_literal '(' constant_expression ')'
1536	{ $$ = new ExpressionNode( new AsmExpr( nullptr, $1, maybeMoveBuild<Expression>( $3 ) ) ); }
1537	\| '[' IDENTIFIER ']' string_literal '(' constant_expression ')'
1538	{ $$ = new ExpressionNode( new AsmExpr( $2, $4, maybeMoveBuild<Expression>( $6 ) ) ); }
1539	;
1540
1541	asm_clobbers_list_opt: // GCC
1542	// empty
1543	{ $$ = nullptr; } // use default argument
1544	\| string_literal
1545	{ $$ = new ExpressionNode( $1 ); }
1546	\| asm_clobbers_list_opt ',' string_literal
1547	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( $3 ) )); }
1548	;
1549
1550	label_list:
1551	identifier
1552	{
1553	$$ = new LabelNode(); $$->labels.push_back( *$1 );
1554	delete $1; // allocated by lexer
1555	}
1556	\| label_list ',' identifier
1557	{
1558	$$ = $1; $1->labels.push_back( *$3 );
1559	delete $3; // allocated by lexer
1560	}
1561	;
1562
1563	//***************************** DECLARATIONS *******************************
1564
1565	declaration_list_opt: // used at beginning of switch statement
1566	// empty
1567	{ $$ = nullptr; }
1568	\| declaration_list
1569	;
1570
1571	declaration_list:
1572	declaration
1573	\| declaration_list declaration
1574	{ $$ = $1->appendList( $2 ); }
1575	;
1576
1577	KR_parameter_list_opt: // used to declare parameter types in K&R style functions
1578	// empty
1579	{ $$ = nullptr; }
1580	\| KR_parameter_list
1581	;
1582
1583	KR_parameter_list:
1584	push c_declaration pop ';'
1585	{ $$ = $2; }
1586	\| KR_parameter_list push c_declaration pop ';'
1587	{ $$ = $1->appendList( $3 ); }
1588	;
1589
1590	local_label_declaration_opt: // GCC, local label
1591	// empty
1592	\| local_label_declaration_list
1593	;
1594
1595	local_label_declaration_list: // GCC, local label
1596	LABEL local_label_list ';'
1597	\| local_label_declaration_list LABEL local_label_list ';'
1598	;
1599
1600	local_label_list: // GCC, local label
1601	identifier_or_type_name
1602	\| local_label_list ',' identifier_or_type_name
1603	;
1604
1605	declaration: // old & new style declarations
1606	c_declaration ';'
1607	\| cfa_declaration ';' // CFA
1608	\| static_assert // C11
1609	;
1610
1611	static_assert:
1612	STATICASSERT '(' constant_expression ',' string_literal ')' ';' // C11
1613	{ $$ = DeclarationNode::newStaticAssert( $3, $5 ); }
1614	\| STATICASSERT '(' constant_expression ')' ';' // CFA
1615	{ $$ = DeclarationNode::newStaticAssert( $3, build_constantStr( *new string( "\"\"" ) ) ); }
1616
1617	// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
1618	// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
1619	// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
1620	// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
1621	// the declaration list (as in Pascal). ANSI C and the new CFA declarations may appear together in the same program
1622	// block, but cannot be mixed within a specific declaration.
1623	//
1624	// CFA C
1625	// [10] int x; int x[10]; // array of 10 integers
1626	// [10] * char y; char *y[10]; // array of 10 pointers to char
1627
1628	cfa_declaration: // CFA
1629	cfa_variable_declaration
1630	\| cfa_typedef_declaration
1631	\| cfa_function_declaration
1632	\| type_declaring_list
1633	{ SemanticError( yylloc, "otype declaration is currently unimplemented." ); $$ = nullptr; }
1634	\| trait_specifier
1635	;
1636
1637	cfa_variable_declaration: // CFA
1638	cfa_variable_specifier initializer_opt
1639	{ $$ = $1->addInitializer( $2 ); }
1640	\| declaration_qualifier_list cfa_variable_specifier initializer_opt
1641	// declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
1642	// them as a type_qualifier cannot appear in that context.
1643	{ $$ = $2->addQualifiers( $1 )->addInitializer( $3 ); }
1644	\| cfa_variable_declaration pop ',' push identifier_or_type_name initializer_opt
1645	{ $$ = $1->appendList( $1->cloneType( $5 )->addInitializer( $6 ) ); }
1646	;
1647
1648	cfa_variable_specifier: // CFA
1649	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1650	// storage-class
1651	cfa_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
1652	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
1653	\| cfa_abstract_tuple identifier_or_type_name asm_name_opt
1654	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
1655	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name asm_name_opt
1656	{ $$ = $2->addQualifiers( $1 )->addName( $3 )->addAsmName( $4 ); }
1657	;
1658
1659	cfa_function_declaration: // CFA
1660	cfa_function_specifier
1661	\| type_qualifier_list cfa_function_specifier
1662	{ $$ = $2->addQualifiers( $1 ); }
1663	\| declaration_qualifier_list cfa_function_specifier
1664	{ $$ = $2->addQualifiers( $1 ); }
1665	\| declaration_qualifier_list type_qualifier_list cfa_function_specifier
1666	{ $$ = $3->addQualifiers( $1 )->addQualifiers( $2 ); }
1667	\| cfa_function_declaration ',' identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')'
1668	{
1669	// Append the return type at the start (left-hand-side) to each identifier in the list.
1670	DeclarationNode * ret = new DeclarationNode;
1671	ret->type = maybeClone( $1->type->base );
1672	$$ = $1->appendList( DeclarationNode::newFunction( $3, ret, $6, nullptr ) );
1673	}
1674	;
1675
1676	cfa_function_specifier: // CFA
1677	// '[' ']' identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')' // S/R conflict
1678	// {
1679	// $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( 0 ), $6, 0, true );
1680	// }
1681	// '[' ']' identifier '(' push cfa_parameter_ellipsis_list_opt pop ')'
1682	// {
1683	// typedefTable.setNextIdentifier( *$5 );
1684	// $$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
1685	// }
1686	// \| '[' ']' TYPEDEFname '(' push cfa_parameter_ellipsis_list_opt pop ')'
1687	// {
1688	// typedefTable.setNextIdentifier( *$5 );
1689	// $$ = DeclarationNode::newFunction( $5, DeclarationNode::newTuple( 0 ), $8, 0, true );
1690	// }
1691	// \| '[' ']' typegen_name
1692	// identifier_or_type_name must be broken apart because of the sequence:
1693	//
1694	// '[' ']' identifier_or_type_name '(' cfa_parameter_ellipsis_list_opt ')'
1695	// '[' ']' type_specifier
1696	//
1697	// type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
1698	// flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
1699	cfa_abstract_tuple identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')' attribute_list_opt
1700	// To obtain LR(1 ), this rule must be factored out from function return type (see cfa_abstract_declarator).
1701	{ $$ = DeclarationNode::newFunction( $2, $1, $5, 0 )->addQualifiers( $8 ); }
1702	\| cfa_function_return identifier_or_type_name '(' push cfa_parameter_ellipsis_list_opt pop ')' attribute_list_opt
1703	{ $$ = DeclarationNode::newFunction( $2, $1, $5, 0 )->addQualifiers( $8 ); }
1704	;
1705
1706	cfa_function_return: // CFA
1707	'[' push cfa_parameter_list pop ']'
1708	{ $$ = DeclarationNode::newTuple( $3 ); }
1709	\| '[' push cfa_parameter_list pop ',' push cfa_abstract_parameter_list pop ']'
1710	// To obtain LR(1 ), the last cfa_abstract_parameter_list is added into this flattened rule to lookahead to the ']'.
1711	{ $$ = DeclarationNode::newTuple( $3->appendList( $7 ) ); }
1712	;
1713
1714	cfa_typedef_declaration: // CFA
1715	TYPEDEF cfa_variable_specifier
1716	{
1717	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "1" );
1718	$$ = $2->addTypedef();
1719	}
1720	\| TYPEDEF cfa_function_specifier
1721	{
1722	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "2" );
1723	$$ = $2->addTypedef();
1724	}
1725	\| cfa_typedef_declaration pop ',' push identifier
1726	{
1727	typedefTable.addToEnclosingScope( *$5, TYPEDEFname, "3" );
1728	$$ = $1->appendList( $1->cloneType( $5 ) );
1729	}
1730	;
1731
1732	// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
1733	// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.
1734
1735	typedef_declaration:
1736	TYPEDEF type_specifier declarator
1737	{
1738	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "4" );
1739	$$ = $3->addType( $2 )->addTypedef();
1740	}
1741	\| typedef_declaration pop ',' push declarator
1742	{
1743	typedefTable.addToEnclosingScope( *$5->name, TYPEDEFname, "5" );
1744	$$ = $1->appendList( $1->cloneBaseType( $5 )->addTypedef() );
1745	}
1746	\| type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
1747	{
1748	typedefTable.addToEnclosingScope( *$4->name, TYPEDEFname, "6" );
1749	$$ = $4->addType( $3 )->addQualifiers( $1 )->addTypedef();
1750	}
1751	\| type_specifier TYPEDEF declarator
1752	{
1753	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "7" );
1754	$$ = $3->addType( $1 )->addTypedef();
1755	}
1756	\| type_specifier TYPEDEF type_qualifier_list declarator
1757	{
1758	typedefTable.addToEnclosingScope( *$4->name, TYPEDEFname, "8" );
1759	$$ = $4->addQualifiers( $1 )->addTypedef()->addType( $1 );
1760	}
1761	;
1762
1763	typedef_expression:
1764	// deprecated GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
1765	TYPEDEF identifier '=' assignment_expression
1766	{
1767	SemanticError( yylloc, "Typedef expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
1768	}
1769	\| typedef_expression pop ',' push identifier '=' assignment_expression
1770	{
1771	SemanticError( yylloc, "Typedef expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
1772	}
1773	;
1774
1775	c_declaration:
1776	declaration_specifier declaring_list
1777	{ $$ = distAttr( $1, $2 ); }
1778	\| typedef_declaration
1779	\| typedef_expression // deprecated GCC, naming expression type
1780	\| sue_declaration_specifier
1781	;
1782
1783	declaring_list:
1784	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1785	// storage-class
1786	declarator asm_name_opt initializer_opt
1787	{ $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
1788	\| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
1789	{ $$ = $1->appendList( $4->addQualifiers( $3 )->addAsmName( $5 )->addInitializer( $6 ) ); }
1790	;
1791
1792	declaration_specifier: // type specifier + storage class
1793	basic_declaration_specifier
1794	\| sue_declaration_specifier
1795	\| type_declaration_specifier
1796	;
1797
1798	declaration_specifier_nobody: // type specifier + storage class - {...}
1799	// Preclude SUE declarations in restricted scopes:
1800	//
1801	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
1802	//
1803	// because it is impossible to call f due to name equivalence.
1804	basic_declaration_specifier
1805	\| sue_declaration_specifier_nobody
1806	\| type_declaration_specifier
1807	;
1808
1809	type_specifier: // type specifier
1810	basic_type_specifier
1811	\| sue_type_specifier
1812	\| type_type_specifier
1813	;
1814
1815	type_specifier_nobody: // type specifier - {...}
1816	// Preclude SUE declarations in restricted scopes:
1817	//
1818	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
1819	//
1820	// because it is impossible to call f due to name equivalence.
1821	basic_type_specifier
1822	\| sue_type_specifier_nobody
1823	\| type_type_specifier
1824	;
1825
1826	type_qualifier_list_opt: // GCC, used in asm_statement
1827	// empty
1828	{ $$ = nullptr; }
1829	\| type_qualifier_list
1830	;
1831
1832	type_qualifier_list:
1833	// A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
1834	//
1835	// ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
1836	// specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
1837	// appeared only once.
1838	type_qualifier
1839	\| type_qualifier_list type_qualifier
1840	{ $$ = $1->addQualifiers( $2 ); }
1841	;
1842
1843	type_qualifier:
1844	type_qualifier_name
1845	\| attribute // trick handles most atrribute locations
1846	;
1847
1848	type_qualifier_name:
1849	CONST
1850	{ $$ = DeclarationNode::newTypeQualifier( Type::Const ); }
1851	\| RESTRICT
1852	{ $$ = DeclarationNode::newTypeQualifier( Type::Restrict ); }
1853	\| VOLATILE
1854	{ $$ = DeclarationNode::newTypeQualifier( Type::Volatile ); }
1855	\| ATOMIC
1856	{ $$ = DeclarationNode::newTypeQualifier( Type::Atomic ); }
1857	\| forall
1858	;
1859
1860	forall:
1861	FORALL '(' type_parameter_list ')' // CFA
1862	{ $$ = DeclarationNode::newForall( $3 ); }
1863	;
1864
1865	declaration_qualifier_list:
1866	storage_class_list
1867	\| type_qualifier_list storage_class_list // remaining OBSOLESCENT (see 2 )
1868	{ $$ = $1->addQualifiers( $2 ); }
1869	\| declaration_qualifier_list type_qualifier_list storage_class_list
1870	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1871	;
1872
1873	storage_class_list:
1874	// A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
1875	// only one of each is specified, except for inline, which can appear with the others.
1876	//
1877	// ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
1878	// specifiers in a declaration.
1879	storage_class
1880	\| storage_class_list storage_class
1881	{ $$ = $1->addQualifiers( $2 ); }
1882	;
1883
1884	storage_class:
1885	EXTERN
1886	{ $$ = DeclarationNode::newStorageClass( Type::Extern ); }
1887	\| STATIC
1888	{ $$ = DeclarationNode::newStorageClass( Type::Static ); }
1889	\| AUTO
1890	{ $$ = DeclarationNode::newStorageClass( Type::Auto ); }
1891	\| REGISTER
1892	{ $$ = DeclarationNode::newStorageClass( Type::Register ); }
1893	\| THREADLOCAL // C11
1894	{ $$ = DeclarationNode::newStorageClass( Type::Threadlocal ); }
1895	// Put function specifiers here to simplify parsing rules, but separate them semantically.
1896	\| INLINE // C99
1897	{ $$ = DeclarationNode::newFuncSpecifier( Type::Inline ); }
1898	\| FORTRAN // C99
1899	{ $$ = DeclarationNode::newFuncSpecifier( Type::Fortran ); }
1900	\| NORETURN // C11
1901	{ $$ = DeclarationNode::newFuncSpecifier( Type::Noreturn ); }
1902	;
1903
1904	basic_type_name:
1905	VOID
1906	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
1907	\| BOOL // C99
1908	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Bool ); }
1909	\| CHAR
1910	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Char ); }
1911	\| INT
1912	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int ); }
1913	\| INT128
1914	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int128 ); }
1915	\| UINT128
1916	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int128 )->addType( DeclarationNode::newSignedNess( DeclarationNode::Unsigned ) ); }
1917	\| FLOAT
1918	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float ); }
1919	\| DOUBLE
1920	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Double ); }
1921	\| uuFLOAT80
1922	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uuFloat80 ); }
1923	\| uuFLOAT128
1924	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uuFloat128 ); }
1925	\| uFLOAT16
1926	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat16 ); }
1927	\| uFLOAT32
1928	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat32 ); }
1929	\| uFLOAT32X
1930	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat32x ); }
1931	\| uFLOAT64
1932	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat64 ); }
1933	\| uFLOAT64X
1934	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat64x ); }
1935	\| uFLOAT128
1936	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat128 ); }
1937	\| DECIMAL32
1938	{ SemanticError( yylloc, "_Decimal32 is currently unimplemented." ); $$ = nullptr; }
1939	\| DECIMAL64
1940	{ SemanticError( yylloc, "_Decimal64 is currently unimplemented." ); $$ = nullptr; }
1941	\| DECIMAL128
1942	{ SemanticError( yylloc, "_Decimal128 is currently unimplemented." ); $$ = nullptr; }
1943	\| COMPLEX // C99
1944	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Complex ); }
1945	\| IMAGINARY // C99
1946	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Imaginary ); }
1947	\| SIGNED
1948	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Signed ); }
1949	\| UNSIGNED
1950	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Unsigned ); }
1951	\| SHORT
1952	{ $$ = DeclarationNode::newLength( DeclarationNode::Short ); }
1953	\| LONG
1954	{ $$ = DeclarationNode::newLength( DeclarationNode::Long ); }
1955	\| VALIST // GCC, __builtin_va_list
1956	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Valist ); }
1957	\| AUTO_TYPE
1958	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::AutoType ); }
1959	\| vtable
1960	;
1961
1962	vtable_opt:
1963	// empty
1964	{ $$ = nullptr; }
1965	\| vtable
1966	;
1967
1968	vtable:
1969	VTABLE '(' type_name ')' default_opt
1970	{ $$ = DeclarationNode::newVtableType( $3 ); }
1971	// { SemanticError( yylloc, "vtable is currently unimplemented." ); $$ = nullptr; }
1972	;
1973
1974	default_opt:
1975	// empty
1976	{ $$ = nullptr; }
1977	\| DEFAULT
1978	{ SemanticError( yylloc, "vtable default is currently unimplemented." ); $$ = nullptr; }
1979	;
1980
1981	basic_declaration_specifier:
1982	// A semantic check is necessary for conflicting storage classes.
1983	basic_type_specifier
1984	\| declaration_qualifier_list basic_type_specifier
1985	{ $$ = $2->addQualifiers( $1 ); }
1986	\| basic_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
1987	{ $$ = $1->addQualifiers( $2 ); }
1988	\| basic_declaration_specifier storage_class type_qualifier_list
1989	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
1990	\| basic_declaration_specifier storage_class basic_type_specifier
1991	{ $$ = $3->addQualifiers( $2 )->addType( $1 ); }
1992	;
1993
1994	basic_type_specifier:
1995	direct_type
1996	// Cannot have type modifiers, e.g., short, long, etc.
1997	\| type_qualifier_list_opt indirect_type type_qualifier_list_opt
1998	{ $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
1999	;
2000
2001	direct_type:
2002	basic_type_name
2003	\| type_qualifier_list basic_type_name
2004	{ $$ = $2->addQualifiers( $1 ); }
2005	\| direct_type type_qualifier
2006	{ $$ = $1->addQualifiers( $2 ); }
2007	\| direct_type basic_type_name
2008	{ $$ = $1->addType( $2 ); }
2009	;
2010
2011	indirect_type:
2012	TYPEOF '(' type ')' // GCC: typeof( x ) y;
2013	{ $$ = $3; }
2014	\| TYPEOF '(' comma_expression ')' // GCC: typeof( a+b ) y;
2015	{ $$ = DeclarationNode::newTypeof( $3 ); }
2016	\| BASETYPEOF '(' type ')' // CFA: basetypeof( x ) y;
2017	{ $$ = DeclarationNode::newTypeof( new ExpressionNode( new TypeExpr( maybeMoveBuildType( $3 ) ) ), true ); }
2018	\| BASETYPEOF '(' comma_expression ')' // CFA: basetypeof( a+b ) y;
2019	{ $$ = DeclarationNode::newTypeof( $3, true ); }
2020	\| ZERO_T // CFA
2021	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Zero ); }
2022	\| ONE_T // CFA
2023	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::One ); }
2024	;
2025
2026	sue_declaration_specifier: // struct, union, enum + storage class + type specifier
2027	sue_type_specifier
2028	\| declaration_qualifier_list sue_type_specifier
2029	{ $$ = $2->addQualifiers( $1 ); }
2030	\| sue_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2031	{ $$ = $1->addQualifiers( $2 ); }
2032	\| sue_declaration_specifier storage_class type_qualifier_list
2033	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2034	;
2035
2036	sue_type_specifier: // struct, union, enum + type specifier
2037	elaborated_type
2038	\| type_qualifier_list
2039	{ if ( $1->type != nullptr && $1->type->forall ) forall = true; } // remember generic type
2040	elaborated_type
2041	{ $$ = $3->addQualifiers( $1 ); }
2042	\| sue_type_specifier type_qualifier
2043	{
2044	if ( $2->type != nullptr && $2->type->forall ) forall = true; // remember generic type
2045	$$ = $1->addQualifiers( $2 );
2046	}
2047	;
2048
2049	sue_declaration_specifier_nobody: // struct, union, enum - {...} + storage class + type specifier
2050	sue_type_specifier_nobody
2051	\| declaration_qualifier_list sue_type_specifier_nobody
2052	{ $$ = $2->addQualifiers( $1 ); }
2053	\| sue_declaration_specifier_nobody storage_class // remaining OBSOLESCENT (see 2)
2054	{ $$ = $1->addQualifiers( $2 ); }
2055	\| sue_declaration_specifier_nobody storage_class type_qualifier_list
2056	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2057	;
2058
2059	sue_type_specifier_nobody: // struct, union, enum - {...} + type specifier
2060	elaborated_type_nobody
2061	\| type_qualifier_list elaborated_type_nobody
2062	{ $$ = $2->addQualifiers( $1 ); }
2063	\| sue_type_specifier_nobody type_qualifier
2064	{ $$ = $1->addQualifiers( $2 ); }
2065	;
2066
2067	type_declaration_specifier:
2068	type_type_specifier
2069	\| declaration_qualifier_list type_type_specifier
2070	{ $$ = $2->addQualifiers( $1 ); }
2071	\| type_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2072	{ $$ = $1->addQualifiers( $2 ); }
2073	\| type_declaration_specifier storage_class type_qualifier_list
2074	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2075	;
2076
2077	type_type_specifier: // typedef types
2078	type_name
2079	\| type_qualifier_list type_name
2080	{ $$ = $2->addQualifiers( $1 ); }
2081	\| type_type_specifier type_qualifier
2082	{ $$ = $1->addQualifiers( $2 ); }
2083	;
2084
2085	type_name:
2086	TYPEDEFname
2087	{ $$ = DeclarationNode::newFromTypedef( $1 ); }
2088	\| '.' TYPEDEFname
2089	{ $$ = DeclarationNode::newQualifiedType( DeclarationNode::newFromGlobalScope(), DeclarationNode::newFromTypedef( $2 ) ); }
2090	\| type_name '.' TYPEDEFname
2091	{ $$ = DeclarationNode::newQualifiedType( $1, DeclarationNode::newFromTypedef( $3 ) ); }
2092	\| typegen_name
2093	\| '.' typegen_name
2094	{ $$ = DeclarationNode::newQualifiedType( DeclarationNode::newFromGlobalScope(), $2 ); }
2095	\| type_name '.' typegen_name
2096	{ $$ = DeclarationNode::newQualifiedType( $1, $3 ); }
2097	;
2098
2099	typegen_name: // CFA
2100	TYPEGENname
2101	{ $$ = DeclarationNode::newFromTypeGen( $1, nullptr ); }
2102	\| TYPEGENname '(' ')'
2103	{ $$ = DeclarationNode::newFromTypeGen( $1, nullptr ); }
2104	\| TYPEGENname '(' type_list ')'
2105	{ $$ = DeclarationNode::newFromTypeGen( $1, $3 ); }
2106	;
2107
2108	elaborated_type: // struct, union, enum
2109	aggregate_type
2110	\| enum_type
2111	;
2112
2113	elaborated_type_nobody: // struct, union, enum - {...}
2114	aggregate_type_nobody
2115	\| enum_type_nobody
2116	;
2117
2118	aggregate_type: // struct, union
2119	aggregate_key attribute_list_opt
2120	{ forall = false; } // reset
2121	'{' field_declaration_list_opt '}' type_parameters_opt
2122	{ $$ = DeclarationNode::newAggregate( $1, nullptr, $7, $5, true )->addQualifiers( $2 ); }
2123	\| aggregate_key attribute_list_opt identifier
2124	{
2125	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname ); // create typedef
2126	forall = false; // reset
2127	}
2128	'{' field_declaration_list_opt '}' type_parameters_opt
2129	{ $$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 ); }
2130	\| aggregate_key attribute_list_opt TYPEDEFname // unqualified type name
2131	{
2132	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname ); // create typedef
2133	forall = false; // reset
2134	}
2135	'{' field_declaration_list_opt '}' type_parameters_opt
2136	{
2137	DeclarationNode::newFromTypedef( $3 );
2138	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2139	}
2140	\| aggregate_key attribute_list_opt TYPEGENname // unqualified type name
2141	{
2142	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname ); // create typedef
2143	forall = false; // reset
2144	}
2145	'{' field_declaration_list_opt '}' type_parameters_opt
2146	{
2147	DeclarationNode::newFromTypeGen( $3, nullptr );
2148	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2149	}
2150	\| aggregate_type_nobody
2151	;
2152
2153	type_parameters_opt:
2154	// empty
2155	{ $$ = nullptr; } %prec '}'
2156	\| '(' type_list ')'
2157	{ $$ = $2; }
2158	;
2159
2160	aggregate_type_nobody: // struct, union - {...}
2161	aggregate_key attribute_list_opt identifier
2162	{
2163	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname );
2164	forall = false; // reset
2165	$$ = DeclarationNode::newAggregate( $1, $3, nullptr, nullptr, false )->addQualifiers( $2 );
2166	}
2167	\| aggregate_key attribute_list_opt type_name
2168	{
2169	forall = false; // reset
2170	// Create new generic declaration with same name as previous forward declaration, where the IDENTIFIER is
2171	// switched to a TYPEGENname. Link any generic arguments from typegen_name to new generic declaration and
2172	// delete newFromTypeGen.
2173	$$ = DeclarationNode::newAggregate( $1, $3->type->symbolic.name, $3->type->symbolic.actuals, nullptr, false )->addQualifiers( $2 );
2174	$3->type->symbolic.name = nullptr;
2175	$3->type->symbolic.actuals = nullptr;
2176	delete $3;
2177	}
2178	;
2179
2180	aggregate_key:
2181	aggregate_data
2182	\| aggregate_control
2183	;
2184
2185	aggregate_data:
2186	STRUCT vtable_opt
2187	{ $$ = AggregateDecl::Struct; }
2188	\| UNION
2189	{ $$ = AggregateDecl::Union; }
2190	\| EXCEPTION // CFA
2191	{ $$ = AggregateDecl::Exception; }
2192	// { SemanticError( yylloc, "exception aggregate is currently unimplemented." ); $$ = AggregateDecl::NoAggregate; }
2193	;
2194
2195	aggregate_control: // CFA
2196	MONITOR
2197	{ $$ = AggregateDecl::Monitor; }
2198	\| MUTEX STRUCT
2199	{ $$ = AggregateDecl::Monitor; }
2200	\| GENERATOR
2201	{ $$ = AggregateDecl::Generator; }
2202	\| MUTEX GENERATOR
2203	{ SemanticError( yylloc, "monitor generator is currently unimplemented." ); $$ = AggregateDecl::NoAggregate; }
2204	\| COROUTINE
2205	{ $$ = AggregateDecl::Coroutine; }
2206	\| MUTEX COROUTINE
2207	{ SemanticError( yylloc, "monitor coroutine is currently unimplemented." ); $$ = AggregateDecl::NoAggregate; }
2208	\| THREAD
2209	{ $$ = AggregateDecl::Thread; }
2210	\| MUTEX THREAD
2211	{ SemanticError( yylloc, "monitor thread is currently unimplemented." ); $$ = AggregateDecl::NoAggregate; }
2212	;
2213
2214	field_declaration_list_opt:
2215	// empty
2216	{ $$ = nullptr; }
2217	\| field_declaration_list_opt field_declaration
2218	{ $$ = $1 ? $1->appendList( $2 ) : $2; }
2219	;
2220
2221	field_declaration:
2222	type_specifier field_declaring_list_opt ';'
2223	{ $$ = fieldDecl( $1, $2 ); }
2224	\| EXTENSION type_specifier field_declaring_list_opt ';' // GCC
2225	{ $$ = fieldDecl( $2, $3 ); distExt( $$ ); }
2226	\| INLINE type_specifier field_abstract_list_opt ';' // CFA
2227	{
2228	if ( ! $3 ) { // field declarator ?
2229	$3 = DeclarationNode::newName( nullptr );
2230	} // if
2231	$3->inLine = true;
2232	$$ = distAttr( $2, $3 ); // mark all fields in list
2233	distInl( $3 );
2234	}
2235	\| INLINE aggregate_control ';' // CFA
2236	{ SemanticError( yylloc, "INLINE aggregate control currently unimplemented." ); $$ = nullptr; }
2237	\| typedef_declaration ';' // CFA
2238	\| cfa_field_declaring_list ';' // CFA, new style field declaration
2239	\| EXTENSION cfa_field_declaring_list ';' // GCC
2240	{ distExt( $2 ); $$ = $2; } // mark all fields in list
2241	\| INLINE cfa_field_abstract_list ';' // CFA, new style field declaration
2242	{ $$ = $2; } // mark all fields in list
2243	\| cfa_typedef_declaration ';' // CFA
2244	\| static_assert // C11
2245	;
2246
2247	field_declaring_list_opt:
2248	// empty
2249	{ $$ = nullptr; }
2250	\| field_declarator
2251	\| field_declaring_list_opt ',' attribute_list_opt field_declarator
2252	{ $$ = $1->appendList( $4->addQualifiers( $3 ) ); }
2253	;
2254
2255	field_declarator:
2256	bit_subrange_size // C special case, no field name
2257	{ $$ = DeclarationNode::newBitfield( $1 ); }
2258	\| variable_declarator bit_subrange_size_opt
2259	// A semantic check is required to ensure bit_subrange only appears on integral types.
2260	{ $$ = $1->addBitfield( $2 ); }
2261	\| variable_type_redeclarator bit_subrange_size_opt
2262	// A semantic check is required to ensure bit_subrange only appears on integral types.
2263	{ $$ = $1->addBitfield( $2 ); }
2264	;
2265
2266	field_abstract_list_opt:
2267	// empty
2268	{ $$ = nullptr; }
2269	\| field_abstract
2270	\| field_abstract_list_opt ',' attribute_list_opt field_abstract
2271	{ $$ = $1->appendList( $4->addQualifiers( $3 ) ); }
2272	;
2273
2274	field_abstract:
2275	// no bit fields
2276	variable_abstract_declarator
2277	;
2278
2279	cfa_field_declaring_list: // CFA, new style field declaration
2280	// bit-fields are handled by C declarations
2281	cfa_abstract_declarator_tuple identifier_or_type_name
2282	{ $$ = $1->addName( $2 ); }
2283	\| cfa_field_declaring_list ',' identifier_or_type_name
2284	{ $$ = $1->appendList( $1->cloneType( $3 ) ); }
2285	;
2286
2287	cfa_field_abstract_list: // CFA, new style field declaration
2288	// bit-fields are handled by C declarations
2289	cfa_abstract_declarator_tuple
2290	\| cfa_field_abstract_list ','
2291	{ $$ = $1->appendList( $1->cloneType( 0 ) ); }
2292	;
2293
2294	bit_subrange_size_opt:
2295	// empty
2296	{ $$ = nullptr; }
2297	\| bit_subrange_size
2298	;
2299
2300	bit_subrange_size:
2301	':' assignment_expression
2302	{ $$ = $2; }
2303	;
2304
2305	enum_type: // enum
2306	ENUM attribute_list_opt '{' enumerator_list comma_opt '}'
2307	{ $$ = DeclarationNode::newEnum( nullptr, $4, true )->addQualifiers( $2 ); }
2308	\| ENUM attribute_list_opt identifier
2309	{ typedefTable.makeTypedef( *$3 ); }
2310	'{' enumerator_list comma_opt '}'
2311	{ $$ = DeclarationNode::newEnum( $3, $6, true )->addQualifiers( $2 ); }
2312	\| ENUM attribute_list_opt typedef_name // unqualified type name
2313	'{' enumerator_list comma_opt '}'
2314	{ $$ = DeclarationNode::newEnum( $3->name, $5, true )->addQualifiers( $2 ); }
2315	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt '{' enumerator_list comma_opt '}'
2316	{
2317	if ( $3->storageClasses.val != 0 \|\| $3->type->qualifiers.val != 0 ) { SemanticError( yylloc, "storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." ); }
2318	SemanticError( yylloc, "Typed enumeration is currently unimplemented." ); $$ = nullptr;
2319	}
2320	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt identifier attribute_list_opt
2321	{
2322	if ( $3->storageClasses.val != 0 \|\| $3->type->qualifiers.val != 0 ) { SemanticError( yylloc, "storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." ); }
2323	typedefTable.makeTypedef( *$6 );
2324	}
2325	'{' enumerator_list comma_opt '}'
2326	{
2327	SemanticError( yylloc, "Typed enumeration is currently unimplemented." ); $$ = nullptr;
2328	}
2329	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt typedef_name attribute_list_opt '{' enumerator_list comma_opt '}'
2330	{
2331	if ( $3->storageClasses.val != 0 \|\| $3->type->qualifiers.val != 0 ) { SemanticError( yylloc, "storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." ); }
2332	typedefTable.makeTypedef( *$6->name );
2333	SemanticError( yylloc, "Typed enumeration is currently unimplemented." ); $$ = nullptr;
2334	}
2335	\| enum_type_nobody
2336	;
2337
2338	enum_type_nobody: // enum - {...}
2339	ENUM attribute_list_opt identifier
2340	{ typedefTable.makeTypedef( *$3 ); $$ = DeclarationNode::newEnum( $3, 0, false )->addQualifiers( $2 ); }
2341	\| ENUM attribute_list_opt type_name // qualified type name
2342	{ typedefTable.makeTypedef( *$3->type->symbolic.name ); $$ = DeclarationNode::newEnum( $3->type->symbolic.name, 0, false )->addQualifiers( $2 ); }
2343	;
2344
2345	enumerator_list:
2346	identifier_or_type_name enumerator_value_opt
2347	{ $$ = DeclarationNode::newEnumConstant( $1, $2 ); }
2348	\| INLINE type_name
2349	{ $$ = DeclarationNode::newEnumConstant( new string("inline"), nullptr ); }
2350	\| enumerator_list ',' identifier_or_type_name enumerator_value_opt
2351	{ $$ = $1->appendList( DeclarationNode::newEnumConstant( $3, $4 ) ); }
2352	\| enumerator_list ',' INLINE type_name enumerator_value_opt
2353	{ $$ = $1->appendList( DeclarationNode::newEnumConstant( new string("inline"), nullptr ) ); }
2354	;
2355
2356	enumerator_value_opt:
2357	// empty
2358	{ $$ = nullptr; }
2359	// \| '=' constant_expression
2360	// { $$ = $2; }
2361	\| simple_assignment_operator initializer
2362	{ $$ = $2->get_expression(); } // FIX ME: enum only deals with constant_expression
2363	;
2364
2365	cfa_parameter_ellipsis_list_opt: // CFA, abstract + real
2366	// empty
2367	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
2368	\| ELLIPSIS
2369	{ $$ = nullptr; }
2370	\| cfa_abstract_parameter_list
2371	\| cfa_parameter_list
2372	\| cfa_parameter_list pop ',' push cfa_abstract_parameter_list
2373	{ $$ = $1->appendList( $5 ); }
2374	\| cfa_abstract_parameter_list pop ',' push ELLIPSIS
2375	{ $$ = $1->addVarArgs(); }
2376	\| cfa_parameter_list pop ',' push ELLIPSIS
2377	{ $$ = $1->addVarArgs(); }
2378	;
2379
2380	cfa_parameter_list: // CFA
2381	// To obtain LR(1) between cfa_parameter_list and cfa_abstract_tuple, the last cfa_abstract_parameter_list is
2382	// factored out from cfa_parameter_list, flattening the rules to get lookahead to the ']'.
2383	cfa_parameter_declaration
2384	\| cfa_abstract_parameter_list pop ',' push cfa_parameter_declaration
2385	{ $$ = $1->appendList( $5 ); }
2386	\| cfa_parameter_list pop ',' push cfa_parameter_declaration
2387	{ $$ = $1->appendList( $5 ); }
2388	\| cfa_parameter_list pop ',' push cfa_abstract_parameter_list pop ',' push cfa_parameter_declaration
2389	{ $$ = $1->appendList( $5 )->appendList( $9 ); }
2390	;
2391
2392	cfa_abstract_parameter_list: // CFA, new & old style abstract
2393	cfa_abstract_parameter_declaration
2394	\| cfa_abstract_parameter_list pop ',' push cfa_abstract_parameter_declaration
2395	{ $$ = $1->appendList( $5 ); }
2396	;
2397
2398	parameter_type_list_opt:
2399	// empty
2400	{ $$ = nullptr; }
2401	\| ELLIPSIS
2402	{ $$ = nullptr; }
2403	\| parameter_list
2404	\| parameter_list pop ',' push ELLIPSIS
2405	{ $$ = $1->addVarArgs(); }
2406	;
2407
2408	parameter_list: // abstract + real
2409	abstract_parameter_declaration
2410	\| parameter_declaration
2411	\| parameter_list pop ',' push abstract_parameter_declaration
2412	{ $$ = $1->appendList( $5 ); }
2413	\| parameter_list pop ',' push parameter_declaration
2414	{ $$ = $1->appendList( $5 ); }
2415	;
2416
2417	// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
2418	// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.
2419
2420	cfa_parameter_declaration: // CFA, new & old style parameter declaration
2421	parameter_declaration
2422	\| cfa_identifier_parameter_declarator_no_tuple identifier_or_type_name default_initializer_opt
2423	{ $$ = $1->addName( $2 ); }
2424	\| cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2425	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2426	{ $$ = $1->addName( $2 ); }
2427	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2428	{ $$ = $2->addName( $3 )->addQualifiers( $1 ); }
2429	\| cfa_function_specifier
2430	;
2431
2432	cfa_abstract_parameter_declaration: // CFA, new & old style parameter declaration
2433	abstract_parameter_declaration
2434	\| cfa_identifier_parameter_declarator_no_tuple
2435	\| cfa_abstract_tuple
2436	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2437	\| type_qualifier_list cfa_abstract_tuple
2438	{ $$ = $2->addQualifiers( $1 ); }
2439	\| cfa_abstract_function
2440	;
2441
2442	parameter_declaration:
2443	// No SUE declaration in parameter list.
2444	declaration_specifier_nobody identifier_parameter_declarator default_initializer_opt
2445	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2446	\| declaration_specifier_nobody type_parameter_redeclarator default_initializer_opt
2447	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2448	;
2449
2450	abstract_parameter_declaration:
2451	declaration_specifier_nobody default_initializer_opt
2452	{ $$ = $1->addInitializer( $2 ? new InitializerNode( $2 ) : nullptr ); }
2453	\| declaration_specifier_nobody abstract_parameter_declarator default_initializer_opt
2454	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2455	;
2456
2457	// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
2458	// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
2459	// identifiers. The ANSI-style parameter-list can redefine a typedef name.
2460
2461	identifier_list: // K&R-style parameter list => no types
2462	identifier
2463	{ $$ = DeclarationNode::newName( $1 ); }
2464	\| identifier_list ',' identifier
2465	{ $$ = $1->appendList( DeclarationNode::newName( $3 ) ); }
2466	;
2467
2468	identifier_or_type_name:
2469	identifier
2470	\| TYPEDEFname
2471	\| TYPEGENname
2472	;
2473
2474	type_no_function: // sizeof, alignof, cast (constructor)
2475	cfa_abstract_declarator_tuple // CFA
2476	\| type_specifier
2477	\| type_specifier abstract_declarator
2478	{ $$ = $2->addType( $1 ); }
2479	;
2480
2481	type: // typeof, assertion
2482	type_no_function
2483	\| cfa_abstract_function // CFA
2484	;
2485
2486	initializer_opt:
2487	// empty
2488	{ $$ = nullptr; }
2489	\| simple_assignment_operator initializer { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
2490	\| '=' VOID { $$ = new InitializerNode( true ); }
2491	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2492	;
2493
2494	initializer:
2495	assignment_expression { $$ = new InitializerNode( $1 ); }
2496	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2497	;
2498
2499	initializer_list_opt:
2500	// empty
2501	{ $$ = nullptr; }
2502	\| initializer
2503	\| designation initializer { $$ = $2->set_designators( $1 ); }
2504	\| initializer_list_opt ',' initializer { $$ = (InitializerNode *)( $1->set_last( $3 ) ); }
2505	\| initializer_list_opt ',' designation initializer { $$ = (InitializerNode *)($1->set_last( $4->set_designators( $3 ) )); }
2506	;
2507
2508	// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
2509	// '=' to separator the designator from the initializer value, as in:
2510	//
2511	// int x[10] = { [1] = 3 };
2512	//
2513	// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment. To disambiguate this case, CFA
2514	// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
2515	// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
2516	// shift/reduce conflicts
2517
2518	designation:
2519	designator_list ':' // C99, CFA uses ":" instead of "="
2520	\| identifier_at ':' // GCC, field name
2521	{ $$ = new ExpressionNode( build_varref( $1 ) ); }
2522	;
2523
2524	designator_list: // C99
2525	designator
2526	\| designator_list designator
2527	{ $$ = (ExpressionNode *)($1->set_last( $2 )); }
2528	//\| designator_list designator { $$ = new ExpressionNode( $1, $2 ); }
2529	;
2530
2531	designator:
2532	'.' identifier_at // C99, field name
2533	{ $$ = new ExpressionNode( build_varref( $2 ) ); }
2534	\| '[' push assignment_expression pop ']' // C99, single array element
2535	// assignment_expression used instead of constant_expression because of shift/reduce conflicts with tuple.
2536	{ $$ = $3; }
2537	\| '[' push subrange pop ']' // CFA, multiple array elements
2538	{ $$ = $3; }
2539	\| '[' push constant_expression ELLIPSIS constant_expression pop ']' // GCC, multiple array elements
2540	{ $$ = new ExpressionNode( new RangeExpr( maybeMoveBuild<Expression>( $3 ), maybeMoveBuild<Expression>( $5 ) ) ); }
2541	\| '.' '[' push field_name_list pop ']' // CFA, tuple field selector
2542	{ $$ = $4; }
2543	;
2544
2545	// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
2546	// rather than an object-oriented type system. This required four groups of extensions:
2547	//
2548	// Overloading: function, data, and operator identifiers may be overloaded.
2549	//
2550	// Type declarations: "otype" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
2551	// and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
2552	// definitions of new types. Type declarations with storage class "extern" provide opaque types.
2553	//
2554	// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
2555	// site. A polymorphic function is not a template; it is a function, with an address and a type.
2556	//
2557	// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
2558	// types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
2559	// hierarchies. Unlike classes, they can define relationships between types. Assertions declare that a type or
2560	// types provide the operations declared by a specification. Assertions are normally used to declare requirements
2561	// on type arguments of polymorphic functions.
2562
2563	type_parameter_list: // CFA
2564	type_parameter
2565	\| type_parameter_list ',' type_parameter
2566	{ $$ = $1->appendList( $3 ); }
2567	;
2568
2569	type_initializer_opt: // CFA
2570	// empty
2571	{ $$ = nullptr; }
2572	\| '=' type
2573	{ $$ = $2; }
2574	;
2575
2576	type_parameter: // CFA
2577	type_class identifier_or_type_name
2578	{
2579	typedefTable.addToScope( *$2, TYPEDEFname, "9" );
2580	if ( $1 == TypeDecl::Otype ) { SemanticError( yylloc, "otype keyword is deprecated, use T " ); }
2581	if ( $1 == TypeDecl::Dtype ) { SemanticError( yylloc, "dtype keyword is deprecated, use T &" ); }
2582	if ( $1 == TypeDecl::Ttype ) { SemanticError( yylloc, "ttype keyword is deprecated, use T ..." ); }
2583	}
2584	type_initializer_opt assertion_list_opt
2585	{ $$ = DeclarationNode::newTypeParam( $1, $2 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
2586	\| identifier_or_type_name new_type_class
2587	{ typedefTable.addToScope( *$1, TYPEDEFname, "9" ); }
2588	type_initializer_opt assertion_list_opt
2589	{ $$ = DeclarationNode::newTypeParam( $2, $1 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
2590	\| '[' identifier_or_type_name ']'
2591	{
2592	typedefTable.addToScope( *$2, TYPEDIMname, "9" );
2593	$$ = DeclarationNode::newTypeParam( TypeDecl::Dimension, $2 );
2594	}
2595	// \| type_specifier identifier_parameter_declarator
2596	\| assertion_list
2597	{ $$ = DeclarationNode::newTypeParam( TypeDecl::Dtype, new string( DeclarationNode::anonymous.newName() ) )->addAssertions( $1 ); }
2598	;
2599
2600	new_type_class: // CFA
2601	// empty
2602	{ $$ = TypeDecl::Otype; }
2603	\| '&'
2604	{ $$ = TypeDecl::Dtype; }
2605	\| '*'
2606	{ $$ = TypeDecl::DStype; } // dtype + sized
2607	// \| '(' '*' ')'
2608	// { $$ = TypeDecl::Ftype; }
2609	\| ELLIPSIS
2610	{ $$ = TypeDecl::Ttype; }
2611	;
2612
2613	type_class: // CFA
2614	OTYPE
2615	{ $$ = TypeDecl::Otype; }
2616	\| DTYPE
2617	{ $$ = TypeDecl::Dtype; }
2618	\| FTYPE
2619	{ $$ = TypeDecl::Ftype; }
2620	\| TTYPE
2621	{ $$ = TypeDecl::Ttype; }
2622	;
2623
2624	assertion_list_opt: // CFA
2625	// empty
2626	{ $$ = nullptr; }
2627	\| assertion_list
2628	;
2629
2630	assertion_list: // CFA
2631	assertion
2632	\| assertion_list assertion
2633	{ $$ = $1->appendList( $2 ); }
2634	;
2635
2636	assertion: // CFA
2637	'\|' identifier_or_type_name '(' type_list ')'
2638	{ $$ = DeclarationNode::newTraitUse( $2, $4 ); }
2639	\| '\|' '{' push trait_declaration_list pop '}'
2640	{ $$ = $4; }
2641	// \| '\|' '(' push type_parameter_list pop ')' '{' push trait_declaration_list pop '}' '(' type_list ')'
2642	// { SemanticError( yylloc, "Generic data-type assertion is currently unimplemented." ); $$ = nullptr; }
2643	;
2644
2645	type_list: // CFA
2646	type
2647	{ $$ = new ExpressionNode( new TypeExpr( maybeMoveBuildType( $1 ) ) ); }
2648	\| assignment_expression
2649	\| type_list ',' type
2650	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new TypeExpr( maybeMoveBuildType( $3 ) ) ) )); }
2651	\| type_list ',' assignment_expression
2652	{ $$ = (ExpressionNode *)( $1->set_last( $3 )); }
2653	;
2654
2655	type_declaring_list: // CFA
2656	OTYPE type_declarator
2657	{ $$ = $2; }
2658	\| storage_class_list OTYPE type_declarator
2659	{ $$ = $3->addQualifiers( $1 ); }
2660	\| type_declaring_list ',' type_declarator
2661	{ $$ = $1->appendList( $3->copySpecifiers( $1 ) ); }
2662	;
2663
2664	type_declarator: // CFA
2665	type_declarator_name assertion_list_opt
2666	{ $$ = $1->addAssertions( $2 ); }
2667	\| type_declarator_name assertion_list_opt '=' type
2668	{ $$ = $1->addAssertions( $2 )->addType( $4 ); }
2669	;
2670
2671	type_declarator_name: // CFA
2672	identifier_or_type_name
2673	{
2674	typedefTable.addToEnclosingScope( *$1, TYPEDEFname, "10" );
2675	$$ = DeclarationNode::newTypeDecl( $1, 0 );
2676	}
2677	\| identifier_or_type_name '(' type_parameter_list ')'
2678	{
2679	typedefTable.addToEnclosingScope( *$1, TYPEGENname, "11" );
2680	$$ = DeclarationNode::newTypeDecl( $1, $3 );
2681	}
2682	;
2683
2684	trait_specifier: // CFA
2685	TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' '}'
2686	{ $$ = DeclarationNode::newTrait( $2, $4, 0 ); }
2687	\| TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' push trait_declaration_list pop '}'
2688	{ $$ = DeclarationNode::newTrait( $2, $4, $8 ); }
2689	;
2690
2691	trait_declaration_list: // CFA
2692	trait_declaration
2693	\| trait_declaration_list pop push trait_declaration
2694	{ $$ = $1->appendList( $4 ); }
2695	;
2696
2697	trait_declaration: // CFA
2698	cfa_trait_declaring_list ';'
2699	\| trait_declaring_list ';'
2700	;
2701
2702	cfa_trait_declaring_list: // CFA
2703	cfa_variable_specifier
2704	\| cfa_function_specifier
2705	\| cfa_trait_declaring_list pop ',' push identifier_or_type_name
2706	{ $$ = $1->appendList( $1->cloneType( $5 ) ); }
2707	;
2708
2709	trait_declaring_list: // CFA
2710	type_specifier declarator
2711	{ $$ = $2->addType( $1 ); }
2712	\| trait_declaring_list pop ',' push declarator
2713	{ $$ = $1->appendList( $1->cloneBaseType( $5 ) ); }
2714	;
2715
2716	//*************************** EXTERNAL DEFINITIONS ***************************
2717
2718	translation_unit:
2719	// empty, input file
2720	\| external_definition_list
2721	{ parseTree = parseTree ? parseTree->appendList( $1 ) : $1; }
2722	;
2723
2724	external_definition_list:
2725	push external_definition pop
2726	{ $$ = $2; }
2727	\| external_definition_list push external_definition pop
2728	{ $$ = $1 ? $1->appendList( $3 ) : $3; }
2729	;
2730
2731	external_definition_list_opt:
2732	// empty
2733	{ $$ = nullptr; }
2734	\| external_definition_list
2735	;
2736
2737	up:
2738	{ typedefTable.up( forall ); forall = false; }
2739	;
2740
2741	down:
2742	{ typedefTable.down(); }
2743	;
2744
2745	external_definition:
2746	DIRECTIVE
2747	{ $$ = DeclarationNode::newDirectiveStmt( new StatementNode( build_directive( $1 ) ) ); }
2748	\| declaration
2749	\| external_function_definition
2750	\| EXTENSION external_definition // GCC, multiple __extension__ allowed, meaning unknown
2751	{
2752	distExt( $2 ); // mark all fields in list
2753	$$ = $2;
2754	}
2755	\| ASM '(' string_literal ')' ';' // GCC, global assembler statement
2756	{ $$ = DeclarationNode::newAsmStmt( new StatementNode( build_asm( false, $3, 0 ) ) ); }
2757	\| EXTERN STRINGliteral
2758	{
2759	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
2760	linkage = LinkageSpec::update( yylloc, linkage, $2 );
2761	}
2762	up external_definition down
2763	{
2764	linkage = linkageStack.top();
2765	linkageStack.pop();
2766	$$ = $5;
2767	}
2768	\| EXTERN STRINGliteral // C++-style linkage specifier
2769	{
2770	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
2771	linkage = LinkageSpec::update( yylloc, linkage, $2 );
2772	}
2773	'{' up external_definition_list_opt down '}'
2774	{
2775	linkage = linkageStack.top();
2776	linkageStack.pop();
2777	$$ = $6;
2778	}
2779	\| type_qualifier_list
2780	{
2781	if ( $1->type->qualifiers.val ) { SemanticError( yylloc, "CV qualifiers cannot be distributed; only storage-class and forall qualifiers." ); }
2782	if ( $1->type->forall ) forall = true; // remember generic type
2783	}
2784	'{' up external_definition_list_opt down '}' // CFA, namespace
2785	{
2786	distQual( $5, $1 );
2787	forall = false;
2788	$$ = $5;
2789	}
2790	\| declaration_qualifier_list
2791	{
2792	if ( $1->type && $1->type->qualifiers.val ) { SemanticError( yylloc, "CV qualifiers cannot be distributed; only storage-class and forall qualifiers." ); }
2793	if ( $1->type && $1->type->forall ) forall = true; // remember generic type
2794	}
2795	'{' up external_definition_list_opt down '}' // CFA, namespace
2796	{
2797	distQual( $5, $1 );
2798	forall = false;
2799	$$ = $5;
2800	}
2801	\| declaration_qualifier_list type_qualifier_list
2802	{
2803	if ( ($1->type && $1->type->qualifiers.val) \|\| $2->type->qualifiers.val ) { SemanticError( yylloc, "CV qualifiers cannot be distributed; only storage-class and forall qualifiers." ); }
2804	if ( ($1->type && $1->type->forall) \|\| $2->type->forall ) forall = true; // remember generic type
2805	}
2806	'{' up external_definition_list_opt down '}' // CFA, namespace
2807	{
2808	distQual( $6, $1->addQualifiers( $2 ) );
2809	forall = false;
2810	$$ = $6;
2811	}
2812	;
2813
2814	external_function_definition:
2815	function_definition
2816	// These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
2817	// legacy code with global functions missing the type-specifier for the return type, and assuming "int".
2818	// Parsing is possible because function_definition does not appear in the context of an expression (nested
2819	// functions preclude this concession, i.e., all nested function must have a return type). A function prototype
2820	// declaration must still have a type_specifier. OBSOLESCENT (see 1)
2821	\| function_declarator compound_statement
2822	{ $$ = $1->addFunctionBody( $2 ); }
2823	\| KR_function_declarator KR_parameter_list_opt compound_statement
2824	{ $$ = $1->addOldDeclList( $2 )->addFunctionBody( $3 ); }
2825	;
2826
2827	with_clause_opt:
2828	// empty
2829	{ $$ = nullptr; forall = false; }
2830	\| WITH '(' tuple_expression_list ')'
2831	{ $$ = $3; forall = false; }
2832	;
2833
2834	function_definition:
2835	cfa_function_declaration with_clause_opt compound_statement // CFA
2836	{
2837	// Add the function body to the last identifier in the function definition list, i.e., foo3:
2838	// [const double] foo1(), foo2( int ), foo3( double ) { return 3.0; }
2839	$1->get_last()->addFunctionBody( $3, $2 );
2840	$$ = $1;
2841	}
2842	\| declaration_specifier function_declarator with_clause_opt compound_statement
2843	{
2844	rebindForall( $1, $2 );
2845	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
2846	}
2847	\| declaration_specifier variable_type_redeclarator with_clause_opt compound_statement
2848	{
2849	rebindForall( $1, $2 );
2850	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
2851	}
2852	// handles default int return type, OBSOLESCENT (see 1)
2853	\| type_qualifier_list function_declarator with_clause_opt compound_statement
2854	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
2855	// handles default int return type, OBSOLESCENT (see 1)
2856	\| declaration_qualifier_list function_declarator with_clause_opt compound_statement
2857	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
2858	// handles default int return type, OBSOLESCENT (see 1)
2859	\| declaration_qualifier_list type_qualifier_list function_declarator with_clause_opt compound_statement
2860	{ $$ = $3->addFunctionBody( $5, $4 )->addQualifiers( $2 )->addQualifiers( $1 ); }
2861
2862	// Old-style K&R function definition, OBSOLESCENT (see 4)
2863	\| declaration_specifier KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2864	{
2865	rebindForall( $1, $2 );
2866	$$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addType( $1 );
2867	}
2868	// handles default int return type, OBSOLESCENT (see 1)
2869	\| type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2870	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
2871	// handles default int return type, OBSOLESCENT (see 1)
2872	\| declaration_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2873	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
2874	// handles default int return type, OBSOLESCENT (see 1)
2875	\| declaration_qualifier_list type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
2876	{ $$ = $3->addOldDeclList( $4 )->addFunctionBody( $6, $5 )->addQualifiers( $2 )->addQualifiers( $1 ); }
2877	;
2878
2879	declarator:
2880	variable_declarator
2881	\| variable_type_redeclarator
2882	\| function_declarator
2883	;
2884
2885	subrange:
2886	constant_expression '~' constant_expression // CFA, integer subrange
2887	{ $$ = new ExpressionNode( new RangeExpr( maybeMoveBuild<Expression>( $1 ), maybeMoveBuild<Expression>( $3 ) ) ); }
2888	;
2889
2890	asm_name_opt: // GCC
2891	// empty
2892	{ $$ = nullptr; }
2893	\| ASM '(' string_literal ')' attribute_list_opt
2894	{
2895	DeclarationNode * name = new DeclarationNode();
2896	name->asmName = $3;
2897	$$ = name->addQualifiers( $5 );
2898	}
2899	;
2900
2901	attribute_list_opt: // GCC
2902	// empty
2903	{ $$ = nullptr; }
2904	\| attribute_list
2905	;
2906
2907	attribute_list: // GCC
2908	attribute
2909	\| attribute_list attribute
2910	{ $$ = $2->addQualifiers( $1 ); }
2911	;
2912
2913	attribute: // GCC
2914	ATTRIBUTE '(' '(' attribute_name_list ')' ')'
2915	{ $$ = $4; }
2916	;
2917
2918	attribute_name_list: // GCC
2919	attribute_name
2920	\| attribute_name_list ',' attribute_name
2921	{ $$ = $3->addQualifiers( $1 ); }
2922	;
2923
2924	attribute_name: // GCC
2925	// empty
2926	{ $$ = nullptr; }
2927	\| attr_name
2928	{ $$ = DeclarationNode::newAttribute( $1 ); }
2929	\| attr_name '(' argument_expression_list_opt ')'
2930	{ $$ = DeclarationNode::newAttribute( $1, $3 ); }
2931	;
2932
2933	attr_name: // GCC
2934	IDENTIFIER
2935	\| quasi_keyword
2936	\| TYPEDEFname
2937	\| TYPEGENname
2938	\| FALLTHROUGH
2939	{ $$ = Token{ new string( "fallthrough" ), { nullptr, -1 } }; }
2940	\| CONST
2941	{ $$ = Token{ new string( "__const__" ), { nullptr, -1 } }; }
2942	;
2943
2944	// ============================================================================
2945	// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
2946	// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
2947	// in:
2948	//
2949	// int (*f())[10] { ... };
2950	// ... (*f())[3] += 1; // definition mimics usage
2951	//
2952	// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
2953	// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
2954	// ============================================================================
2955
2956	// ----------------------------------------------------------------------------
2957	// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
2958	// to define a variable or function prototype, e.g.:
2959	//
2960	// valid declaration invalid definition
2961	// ----------------- ------------------
2962	// int f; int f {}
2963	// int f; int f {}
2964	// int f[10]; int f[10] {}
2965	// int (f)(int); int (f)(int) {}
2966	//
2967	// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
2968	// variable_declarator and function_declarator.
2969	// ----------------------------------------------------------------------------
2970
2971	// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
2972	// declaring an array of functions versus a pointer to an array of functions.
2973
2974	paren_identifier:
2975	identifier_at
2976	{ $$ = DeclarationNode::newName( $1 ); }
2977	\| '(' paren_identifier ')' // redundant parenthesis
2978	{ $$ = $2; }
2979	;
2980
2981	variable_declarator:
2982	paren_identifier attribute_list_opt
2983	{ $$ = $1->addQualifiers( $2 ); }
2984	\| variable_ptr
2985	\| variable_array attribute_list_opt
2986	{ $$ = $1->addQualifiers( $2 ); }
2987	\| variable_function attribute_list_opt
2988	{ $$ = $1->addQualifiers( $2 ); }
2989	;
2990
2991	variable_ptr:
2992	ptrref_operator variable_declarator
2993	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
2994	\| ptrref_operator type_qualifier_list variable_declarator
2995	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
2996	\| '(' variable_ptr ')' attribute_list_opt // redundant parenthesis
2997	{ $$ = $2->addQualifiers( $4 ); }
2998	\| '(' attribute_list variable_ptr ')' attribute_list_opt // redundant parenthesis
2999	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3000	;
3001
3002	variable_array:
3003	paren_identifier array_dimension
3004	{ $$ = $1->addArray( $2 ); }
3005	\| '(' variable_ptr ')' array_dimension
3006	{ $$ = $2->addArray( $4 ); }
3007	\| '(' attribute_list variable_ptr ')' array_dimension
3008	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3009	\| '(' variable_array ')' multi_array_dimension // redundant parenthesis
3010	{ $$ = $2->addArray( $4 ); }
3011	\| '(' attribute_list variable_array ')' multi_array_dimension // redundant parenthesis
3012	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3013	\| '(' variable_array ')' // redundant parenthesis
3014	{ $$ = $2; }
3015	\| '(' attribute_list variable_array ')' // redundant parenthesis
3016	{ $$ = $3->addQualifiers( $2 ); }
3017	;
3018
3019	variable_function:
3020	'(' variable_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3021	{ $$ = $2->addParamList( $6 ); }
3022	\| '(' attribute_list variable_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3023	{ $$ = $3->addQualifiers( $2 )->addParamList( $7 ); }
3024	\| '(' variable_function ')' // redundant parenthesis
3025	{ $$ = $2; }
3026	\| '(' attribute_list variable_function ')' // redundant parenthesis
3027	{ $$ = $3->addQualifiers( $2 ); }
3028	;
3029
3030	// This pattern parses a function declarator that is not redefining a typedef name. For non-nested functions, there is
3031	// no context where a function definition can redefine a typedef name, i.e., the typedef and function name cannot exist
3032	// is the same scope. The pattern precludes returning arrays and functions versus pointers to arrays and functions.
3033
3034	function_declarator:
3035	function_no_ptr attribute_list_opt
3036	{ $$ = $1->addQualifiers( $2 ); }
3037	\| function_ptr
3038	\| function_array attribute_list_opt
3039	{ $$ = $1->addQualifiers( $2 ); }
3040	;
3041
3042	function_no_ptr:
3043	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3044	{ $$ = $1->addParamList( $4 ); }
3045	\| '(' function_ptr ')' '(' push parameter_type_list_opt pop ')'
3046	{ $$ = $2->addParamList( $6 ); }
3047	\| '(' attribute_list function_ptr ')' '(' push parameter_type_list_opt pop ')'
3048	{ $$ = $3->addQualifiers( $2 )->addParamList( $7 ); }
3049	\| '(' function_no_ptr ')' // redundant parenthesis
3050	{ $$ = $2; }
3051	\| '(' attribute_list function_no_ptr ')' // redundant parenthesis
3052	{ $$ = $3->addQualifiers( $2 ); }
3053	;
3054
3055	function_ptr:
3056	ptrref_operator function_declarator
3057	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3058	\| ptrref_operator type_qualifier_list function_declarator
3059	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3060	\| '(' function_ptr ')' attribute_list_opt
3061	{ $$ = $2->addQualifiers( $4 ); }
3062	\| '(' attribute_list function_ptr ')' attribute_list_opt
3063	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3064	;
3065
3066	function_array:
3067	'(' function_ptr ')' array_dimension
3068	{ $$ = $2->addArray( $4 ); }
3069	\| '(' attribute_list function_ptr ')' array_dimension
3070	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3071	\| '(' function_array ')' multi_array_dimension // redundant parenthesis
3072	{ $$ = $2->addArray( $4 ); }
3073	\| '(' attribute_list function_array ')' multi_array_dimension // redundant parenthesis
3074	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3075	\| '(' function_array ')' // redundant parenthesis
3076	{ $$ = $2; }
3077	\| '(' attribute_list function_array ')' // redundant parenthesis
3078	{ $$ = $3->addQualifiers( $2 ); }
3079	;
3080
3081	// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4)
3082	//
3083	// f( a, b, c ) int a, *b, c[]; {}
3084	//
3085	// that is not redefining a typedef name (see function_declarator for additional comments). The pattern precludes
3086	// returning arrays and functions versus pointers to arrays and functions.
3087
3088	KR_function_declarator:
3089	KR_function_no_ptr
3090	\| KR_function_ptr
3091	\| KR_function_array
3092	;
3093
3094	KR_function_no_ptr:
3095	paren_identifier '(' identifier_list ')' // function_declarator handles empty parameter
3096	{ $$ = $1->addIdList( $3 ); }
3097	\| '(' KR_function_ptr ')' '(' push parameter_type_list_opt pop ')'
3098	{ $$ = $2->addParamList( $6 ); }
3099	\| '(' attribute_list KR_function_ptr ')' '(' push parameter_type_list_opt pop ')'
3100	{ $$ = $3->addQualifiers( $2 )->addParamList( $7 ); }
3101	\| '(' KR_function_no_ptr ')' // redundant parenthesis
3102	{ $$ = $2; }
3103	\| '(' attribute_list KR_function_no_ptr ')' // redundant parenthesis
3104	{ $$ = $3->addQualifiers( $2 ); }
3105	;
3106
3107	KR_function_ptr:
3108	ptrref_operator KR_function_declarator
3109	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3110	\| ptrref_operator type_qualifier_list KR_function_declarator
3111	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3112	\| '(' KR_function_ptr ')'
3113	{ $$ = $2; }
3114	\| '(' attribute_list KR_function_ptr ')'
3115	{ $$ = $3->addQualifiers( $2 ); }
3116	;
3117
3118	KR_function_array:
3119	'(' KR_function_ptr ')' array_dimension
3120	{ $$ = $2->addArray( $4 ); }
3121	\| '(' attribute_list KR_function_ptr ')' array_dimension
3122	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3123	\| '(' KR_function_array ')' multi_array_dimension // redundant parenthesis
3124	{ $$ = $2->addArray( $4 ); }
3125	\| '(' attribute_list KR_function_array ')' multi_array_dimension // redundant parenthesis
3126	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3127	\| '(' KR_function_array ')' // redundant parenthesis
3128	{ $$ = $2; }
3129	\| '(' attribute_list KR_function_array ')' // redundant parenthesis
3130	{ $$ = $3->addQualifiers( $2 ); }
3131	;
3132
3133	// This pattern parses a declaration for a variable or function prototype that redefines a type name, e.g.:
3134	//
3135	// typedef int foo;
3136	// {
3137	// int foo; // redefine typedef name in new scope
3138	// }
3139	//
3140	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3141	// and functions versus pointers to arrays and functions.
3142
3143	paren_type:
3144	typedef_name
3145	{
3146	// hide type name in enclosing scope by variable name
3147	typedefTable.addToEnclosingScope( *$1->name, IDENTIFIER, "ID" );
3148	}
3149	\| '(' paren_type ')'
3150	{ $$ = $2; }
3151	;
3152
3153	variable_type_redeclarator:
3154	paren_type attribute_list_opt
3155	{ $$ = $1->addQualifiers( $2 ); }
3156	\| type_ptr
3157	\| type_array attribute_list_opt
3158	{ $$ = $1->addQualifiers( $2 ); }
3159	\| type_function attribute_list_opt
3160	{ $$ = $1->addQualifiers( $2 ); }
3161	;
3162
3163	type_ptr:
3164	ptrref_operator variable_type_redeclarator
3165	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3166	\| ptrref_operator type_qualifier_list variable_type_redeclarator
3167	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3168	\| '(' type_ptr ')' attribute_list_opt // redundant parenthesis
3169	{ $$ = $2->addQualifiers( $4 ); }
3170	\| '(' attribute_list type_ptr ')' attribute_list_opt // redundant parenthesis
3171	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3172	;
3173
3174	type_array:
3175	paren_type array_dimension
3176	{ $$ = $1->addArray( $2 ); }
3177	\| '(' type_ptr ')' array_dimension
3178	{ $$ = $2->addArray( $4 ); }
3179	\| '(' attribute_list type_ptr ')' array_dimension
3180	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3181	\| '(' type_array ')' multi_array_dimension // redundant parenthesis
3182	{ $$ = $2->addArray( $4 ); }
3183	\| '(' attribute_list type_array ')' multi_array_dimension // redundant parenthesis
3184	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3185	\| '(' type_array ')' // redundant parenthesis
3186	{ $$ = $2; }
3187	\| '(' attribute_list type_array ')' // redundant parenthesis
3188	{ $$ = $3->addQualifiers( $2 ); }
3189	;
3190
3191	type_function:
3192	paren_type '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3193	{ $$ = $1->addParamList( $4 ); }
3194	\| '(' type_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3195	{ $$ = $2->addParamList( $6 ); }
3196	\| '(' attribute_list type_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3197	{ $$ = $3->addQualifiers( $2 )->addParamList( $7 ); }
3198	\| '(' type_function ')' // redundant parenthesis
3199	{ $$ = $2; }
3200	\| '(' attribute_list type_function ')' // redundant parenthesis
3201	{ $$ = $3->addQualifiers( $2 ); }
3202	;
3203
3204	// This pattern parses a declaration for a parameter variable of a function prototype or actual that is not redefining a
3205	// typedef name and allows the C99 array options, which can only appear in a parameter list. The pattern precludes
3206	// declaring an array of functions versus a pointer to an array of functions, and returning arrays and functions versus
3207	// pointers to arrays and functions.
3208
3209	identifier_parameter_declarator:
3210	paren_identifier attribute_list_opt
3211	{ $$ = $1->addQualifiers( $2 ); }
3212	\| '&' MUTEX paren_identifier attribute_list_opt
3213	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( Type::Mutex ), OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3214	\| identifier_parameter_ptr
3215	\| identifier_parameter_array attribute_list_opt
3216	{ $$ = $1->addQualifiers( $2 ); }
3217	\| identifier_parameter_function attribute_list_opt
3218	{ $$ = $1->addQualifiers( $2 ); }
3219	;
3220
3221	identifier_parameter_ptr:
3222	ptrref_operator identifier_parameter_declarator
3223	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3224	\| ptrref_operator type_qualifier_list identifier_parameter_declarator
3225	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3226	\| '(' identifier_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3227	{ $$ = $2->addQualifiers( $4 ); }
3228	;
3229
3230	identifier_parameter_array:
3231	paren_identifier array_parameter_dimension
3232	{ $$ = $1->addArray( $2 ); }
3233	\| '(' identifier_parameter_ptr ')' array_dimension
3234	{ $$ = $2->addArray( $4 ); }
3235	\| '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
3236	{ $$ = $2->addArray( $4 ); }
3237	\| '(' identifier_parameter_array ')' // redundant parenthesis
3238	{ $$ = $2; }
3239	;
3240
3241	identifier_parameter_function:
3242	paren_identifier '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3243	{ $$ = $1->addParamList( $4 ); }
3244	\| '(' identifier_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3245	{ $$ = $2->addParamList( $6 ); }
3246	\| '(' identifier_parameter_function ')' // redundant parenthesis
3247	{ $$ = $2; }
3248	;
3249
3250	// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
3251	// e.g.:
3252	//
3253	// typedef int foo;
3254	// forall( otype T ) struct foo;
3255	// int f( int foo ); // redefine typedef name in new scope
3256	//
3257	// and allows the C99 array options, which can only appear in a parameter list.
3258
3259	type_parameter_redeclarator:
3260	typedef_name attribute_list_opt
3261	{ $$ = $1->addQualifiers( $2 ); }
3262	\| '&' MUTEX typedef_name attribute_list_opt
3263	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( Type::Mutex ), OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3264	\| type_parameter_ptr
3265	\| type_parameter_array attribute_list_opt
3266	{ $$ = $1->addQualifiers( $2 ); }
3267	\| type_parameter_function attribute_list_opt
3268	{ $$ = $1->addQualifiers( $2 ); }
3269	;
3270
3271	typedef_name:
3272	TYPEDEFname
3273	{ $$ = DeclarationNode::newName( $1 ); }
3274	\| TYPEGENname
3275	{ $$ = DeclarationNode::newName( $1 ); }
3276	;
3277
3278	type_parameter_ptr:
3279	ptrref_operator type_parameter_redeclarator
3280	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3281	\| ptrref_operator type_qualifier_list type_parameter_redeclarator
3282	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3283	\| '(' type_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3284	{ $$ = $2->addQualifiers( $4 ); }
3285	;
3286
3287	type_parameter_array:
3288	typedef_name array_parameter_dimension
3289	{ $$ = $1->addArray( $2 ); }
3290	\| '(' type_parameter_ptr ')' array_parameter_dimension
3291	{ $$ = $2->addArray( $4 ); }
3292	;
3293
3294	type_parameter_function:
3295	typedef_name '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3296	{ $$ = $1->addParamList( $4 ); }
3297	\| '(' type_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3298	{ $$ = $2->addParamList( $6 ); }
3299	;
3300
3301	// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
3302	// which the type applies, e.g.:
3303	//
3304	// sizeof( int );
3305	// sizeof( int * );
3306	// sizeof( int [10] );
3307	// sizeof( int (*)() );
3308	// sizeof( int () );
3309	//
3310	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3311	// and functions versus pointers to arrays and functions.
3312
3313	abstract_declarator:
3314	abstract_ptr
3315	\| abstract_array attribute_list_opt
3316	{ $$ = $1->addQualifiers( $2 ); }
3317	\| abstract_function attribute_list_opt
3318	{ $$ = $1->addQualifiers( $2 ); }
3319	;
3320
3321	abstract_ptr:
3322	ptrref_operator
3323	{ $$ = DeclarationNode::newPointer( 0, $1 ); }
3324	\| ptrref_operator type_qualifier_list
3325	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3326	\| ptrref_operator abstract_declarator
3327	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3328	\| ptrref_operator type_qualifier_list abstract_declarator
3329	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3330	\| '(' abstract_ptr ')' attribute_list_opt
3331	{ $$ = $2->addQualifiers( $4 ); }
3332	;
3333
3334	abstract_array:
3335	array_dimension
3336	\| '(' abstract_ptr ')' array_dimension
3337	{ $$ = $2->addArray( $4 ); }
3338	\| '(' abstract_array ')' multi_array_dimension // redundant parenthesis
3339	{ $$ = $2->addArray( $4 ); }
3340	\| '(' abstract_array ')' // redundant parenthesis
3341	{ $$ = $2; }
3342	;
3343
3344	abstract_function:
3345	'(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3346	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $3, nullptr ); }
3347	\| '(' abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3348	{ $$ = $2->addParamList( $6 ); }
3349	\| '(' abstract_function ')' // redundant parenthesis
3350	{ $$ = $2; }
3351	;
3352
3353	array_dimension:
3354	// Only the first dimension can be empty.
3355	'[' ']'
3356	{ $$ = DeclarationNode::newArray( 0, 0, false ); }
3357	\| '[' ']' multi_array_dimension
3358	{ $$ = DeclarationNode::newArray( 0, 0, false )->addArray( $3 ); }
3359	\| '[' push assignment_expression pop ',' comma_expression ']'
3360	{ $$ = DeclarationNode::newArray( $3, 0, false )->addArray( DeclarationNode::newArray( $6, 0, false ) ); }
3361	// { SemanticError( yylloc, "New array dimension is currently unimplemented." ); $$ = nullptr; }
3362	\| multi_array_dimension
3363	;
3364
3365	multi_array_dimension:
3366	'[' push assignment_expression pop ']'
3367	{ $$ = DeclarationNode::newArray( $3, 0, false ); }
3368	\| '[' push '*' pop ']' // C99
3369	{ $$ = DeclarationNode::newVarArray( 0 ); }
3370	\| multi_array_dimension '[' push assignment_expression pop ']'
3371	{ $$ = $1->addArray( DeclarationNode::newArray( $4, 0, false ) ); }
3372	\| multi_array_dimension '[' push '*' pop ']' // C99
3373	{ $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
3374	;
3375
3376	// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
3377	// identifier to which the type applies, e.g.:
3378	//
3379	// int f( int ); // not handled here
3380	// int f( int * ); // abstract function-prototype parameter; no parameter name specified
3381	// int f( int (*)() ); // abstract function-prototype parameter; no parameter name specified
3382	// int f( int (int) ); // abstract function-prototype parameter; no parameter name specified
3383	//
3384	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3385	// and functions versus pointers to arrays and functions. In addition, the pattern handles the
3386	// special meaning of parenthesis around a typedef name:
3387	//
3388	// ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
3389	// parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
3390	// not as redundant parentheses around the identifier."
3391	//
3392	// For example:
3393	//
3394	// typedef float T;
3395	// int f( int ( T [5] ) ); // see abstract_parameter_declarator
3396	// int g( int ( T ( int ) ) ); // see abstract_parameter_declarator
3397	// int f( int f1( T a[5] ) ); // see identifier_parameter_declarator
3398	// int g( int g1( T g2( int p ) ) ); // see identifier_parameter_declarator
3399	//
3400	// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
3401	// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
3402	// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
3403	// functions.
3404
3405	abstract_parameter_declarator:
3406	abstract_parameter_ptr
3407	\| '&' MUTEX attribute_list_opt
3408	{ $$ = DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( Type::Mutex ), OperKinds::AddressOf )->addQualifiers( $3 ); }
3409	\| abstract_parameter_array attribute_list_opt
3410	{ $$ = $1->addQualifiers( $2 ); }
3411	\| abstract_parameter_function attribute_list_opt
3412	{ $$ = $1->addQualifiers( $2 ); }
3413	;
3414
3415	abstract_parameter_ptr:
3416	ptrref_operator
3417	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
3418	\| ptrref_operator type_qualifier_list
3419	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3420	\| ptrref_operator abstract_parameter_declarator
3421	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3422	\| ptrref_operator type_qualifier_list abstract_parameter_declarator
3423	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3424	\| '(' abstract_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3425	{ $$ = $2->addQualifiers( $4 ); }
3426	;
3427
3428	abstract_parameter_array:
3429	array_parameter_dimension
3430	\| '(' abstract_parameter_ptr ')' array_parameter_dimension
3431	{ $$ = $2->addArray( $4 ); }
3432	\| '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
3433	{ $$ = $2->addArray( $4 ); }
3434	\| '(' abstract_parameter_array ')' // redundant parenthesis
3435	{ $$ = $2; }
3436	;
3437
3438	abstract_parameter_function:
3439	'(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3440	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $3, nullptr ); }
3441	\| '(' abstract_parameter_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3442	{ $$ = $2->addParamList( $6 ); }
3443	\| '(' abstract_parameter_function ')' // redundant parenthesis
3444	{ $$ = $2; }
3445	;
3446
3447	array_parameter_dimension:
3448	// Only the first dimension can be empty or have qualifiers.
3449	array_parameter_1st_dimension
3450	\| array_parameter_1st_dimension multi_array_dimension
3451	{ $$ = $1->addArray( $2 ); }
3452	\| multi_array_dimension
3453	;
3454
3455	// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
3456	//
3457	// ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
3458	// a declaration of a function parameter with an array type, and then only in the outermost array type derivation."
3459
3460	array_parameter_1st_dimension:
3461	'[' ']'
3462	{ $$ = DeclarationNode::newArray( 0, 0, false ); }
3463	// multi_array_dimension handles the '[' '*' ']' case
3464	\| '[' push type_qualifier_list '*' pop ']' // remaining C99
3465	{ $$ = DeclarationNode::newVarArray( $3 ); }
3466	\| '[' push type_qualifier_list pop ']'
3467	{ $$ = DeclarationNode::newArray( 0, $3, false ); }
3468	// multi_array_dimension handles the '[' assignment_expression ']' case
3469	\| '[' push type_qualifier_list assignment_expression pop ']'
3470	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
3471	\| '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
3472	{ $$ = DeclarationNode::newArray( $5, $4, true ); }
3473	\| '[' push type_qualifier_list STATIC assignment_expression pop ']'
3474	{ $$ = DeclarationNode::newArray( $5, $3, true ); }
3475	;
3476
3477	// This pattern parses a declaration of an abstract variable, but does not allow "int ()" for a function pointer.
3478	//
3479	// struct S {
3480	// int;
3481	// int *;
3482	// int [10];
3483	// int (*)();
3484	// };
3485
3486	variable_abstract_declarator:
3487	variable_abstract_ptr
3488	\| variable_abstract_array attribute_list_opt
3489	{ $$ = $1->addQualifiers( $2 ); }
3490	\| variable_abstract_function attribute_list_opt
3491	{ $$ = $1->addQualifiers( $2 ); }
3492	;
3493
3494	variable_abstract_ptr:
3495	ptrref_operator
3496	{ $$ = DeclarationNode::newPointer( 0, $1 ); }
3497	\| ptrref_operator type_qualifier_list
3498	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3499	\| ptrref_operator variable_abstract_declarator
3500	{ $$ = $2->addPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3501	\| ptrref_operator type_qualifier_list variable_abstract_declarator
3502	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3503	\| '(' variable_abstract_ptr ')' attribute_list_opt // redundant parenthesis
3504	{ $$ = $2->addQualifiers( $4 ); }
3505	;
3506
3507	variable_abstract_array:
3508	array_dimension
3509	\| '(' variable_abstract_ptr ')' array_dimension
3510	{ $$ = $2->addArray( $4 ); }
3511	\| '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
3512	{ $$ = $2->addArray( $4 ); }
3513	\| '(' variable_abstract_array ')' // redundant parenthesis
3514	{ $$ = $2; }
3515	;
3516
3517	variable_abstract_function:
3518	'(' variable_abstract_ptr ')' '(' push parameter_type_list_opt pop ')' // empty parameter list OBSOLESCENT (see 3)
3519	{ $$ = $2->addParamList( $6 ); }
3520	\| '(' variable_abstract_function ')' // redundant parenthesis
3521	{ $$ = $2; }
3522	;
3523
3524	// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
3525	// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.
3526
3527	cfa_identifier_parameter_declarator_tuple: // CFA
3528	cfa_identifier_parameter_declarator_no_tuple
3529	\| cfa_abstract_tuple
3530	\| type_qualifier_list cfa_abstract_tuple
3531	{ $$ = $2->addQualifiers( $1 ); }
3532	;
3533
3534	cfa_identifier_parameter_declarator_no_tuple: // CFA
3535	cfa_identifier_parameter_ptr
3536	\| cfa_identifier_parameter_array
3537	;
3538
3539	cfa_identifier_parameter_ptr: // CFA
3540	// No SUE declaration in parameter list.
3541	ptrref_operator type_specifier_nobody
3542	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3543	\| type_qualifier_list ptrref_operator type_specifier_nobody
3544	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3545	\| ptrref_operator cfa_abstract_function
3546	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3547	\| type_qualifier_list ptrref_operator cfa_abstract_function
3548	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3549	\| ptrref_operator cfa_identifier_parameter_declarator_tuple
3550	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3551	\| type_qualifier_list ptrref_operator cfa_identifier_parameter_declarator_tuple
3552	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3553	;
3554
3555	cfa_identifier_parameter_array: // CFA
3556	// Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
3557	// shift/reduce conflict with new-style empty (void) function return type.
3558	'[' ']' type_specifier_nobody
3559	{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3560	\| cfa_array_parameter_1st_dimension type_specifier_nobody
3561	{ $$ = $2->addNewArray( $1 ); }
3562	\| '[' ']' multi_array_dimension type_specifier_nobody
3563	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3564	\| cfa_array_parameter_1st_dimension multi_array_dimension type_specifier_nobody
3565	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
3566	\| multi_array_dimension type_specifier_nobody
3567	{ $$ = $2->addNewArray( $1 ); }
3568
3569	\| '[' ']' cfa_identifier_parameter_ptr
3570	{ $$ = $3->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3571	\| cfa_array_parameter_1st_dimension cfa_identifier_parameter_ptr
3572	{ $$ = $2->addNewArray( $1 ); }
3573	\| '[' ']' multi_array_dimension cfa_identifier_parameter_ptr
3574	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( 0, 0, false ) ); }
3575	\| cfa_array_parameter_1st_dimension multi_array_dimension cfa_identifier_parameter_ptr
3576	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
3577	\| multi_array_dimension cfa_identifier_parameter_ptr
3578	{ $$ = $2->addNewArray( $1 ); }
3579	;
3580
3581	cfa_array_parameter_1st_dimension:
3582	'[' push type_qualifier_list '*' pop ']' // remaining C99
3583	{ $$ = DeclarationNode::newVarArray( $3 ); }
3584	\| '[' push type_qualifier_list assignment_expression pop ']'
3585	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
3586	\| '[' push declaration_qualifier_list assignment_expression pop ']'
3587	// declaration_qualifier_list must be used because of shift/reduce conflict with
3588	// assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
3589	// appear in this context.
3590	{ $$ = DeclarationNode::newArray( $4, $3, true ); }
3591	\| '[' push declaration_qualifier_list type_qualifier_list assignment_expression pop ']'
3592	{ $$ = DeclarationNode::newArray( $5, $4->addQualifiers( $3 ), true ); }
3593	;
3594
3595	// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
3596	// identifier to which the type applies, e.g.:
3597	//
3598	// [int] f( int ); // abstract variable parameter; no parameter name specified
3599	// [int] f( [int] (int) ); // abstract function-prototype parameter; no parameter name specified
3600	//
3601	// These rules need LR(3):
3602	//
3603	// cfa_abstract_tuple identifier_or_type_name
3604	// '[' cfa_parameter_list ']' identifier_or_type_name '(' cfa_parameter_ellipsis_list_opt ')'
3605	//
3606	// since a function return type can be syntactically identical to a tuple type:
3607	//
3608	// [int, int] t;
3609	// [int, int] f( int );
3610	//
3611	// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
3612	// cfa_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
3613	// lookahead. To accomplish this, cfa_abstract_declarator has an entry point without tuple, and tuple declarations are
3614	// duplicated when appearing with cfa_function_specifier.
3615
3616	cfa_abstract_declarator_tuple: // CFA
3617	cfa_abstract_tuple
3618	\| type_qualifier_list cfa_abstract_tuple
3619	{ $$ = $2->addQualifiers( $1 ); }
3620	\| cfa_abstract_declarator_no_tuple
3621	;
3622
3623	cfa_abstract_declarator_no_tuple: // CFA
3624	cfa_abstract_ptr
3625	\| cfa_abstract_array
3626	;
3627
3628	cfa_abstract_ptr: // CFA
3629	ptrref_operator type_specifier
3630	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3631	\| type_qualifier_list ptrref_operator type_specifier
3632	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3633	\| ptrref_operator cfa_abstract_function
3634	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3635	\| type_qualifier_list ptrref_operator cfa_abstract_function
3636	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3637	\| ptrref_operator cfa_abstract_declarator_tuple
3638	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( 0, $1 ) ); }
3639	\| type_qualifier_list ptrref_operator cfa_abstract_declarator_tuple
3640	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
3641	;
3642
3643	cfa_abstract_array: // CFA
3644	// Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
3645	// empty (void) function return type.
3646	'[' ']' type_specifier
3647	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3648	\| '[' ']' multi_array_dimension type_specifier
3649	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3650	\| multi_array_dimension type_specifier
3651	{ $$ = $2->addNewArray( $1 ); }
3652	\| '[' ']' cfa_abstract_ptr
3653	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3654	\| '[' ']' multi_array_dimension cfa_abstract_ptr
3655	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
3656	\| multi_array_dimension cfa_abstract_ptr
3657	{ $$ = $2->addNewArray( $1 ); }
3658	;
3659
3660	cfa_abstract_tuple: // CFA
3661	'[' push cfa_abstract_parameter_list pop ']'
3662	{ $$ = DeclarationNode::newTuple( $3 ); }
3663	\| '[' push type_specifier_nobody ELLIPSIS pop ']'
3664	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
3665	\| '[' push type_specifier_nobody ELLIPSIS constant_expression pop ']'
3666	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
3667	;
3668
3669	cfa_abstract_function: // CFA
3670	// '[' ']' '(' cfa_parameter_ellipsis_list_opt ')'
3671	// { $$ = DeclarationNode::newFunction( nullptr, DeclarationNode::newTuple( nullptr ), $4, nullptr ); }
3672	cfa_abstract_tuple '(' push cfa_parameter_ellipsis_list_opt pop ')'
3673	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
3674	\| cfa_function_return '(' push cfa_parameter_ellipsis_list_opt pop ')'
3675	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
3676	;
3677
3678	// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
3679	// each declaration, and in the specifier-qualifier list in each structure declaration and type name."
3680	//
3681	// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
3682	// the declaration specifiers in a declaration is an obsolescent feature."
3683	//
3684	// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
3685	// prototype-format parameter type declarators) is an obsolescent feature."
3686	//
3687	// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
3688	// declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.
3689
3690	//*********************** MISCELLANEOUS ******************************
3691
3692	comma_opt: // redundant comma
3693	// empty
3694	\| ','
3695	;
3696
3697	default_initializer_opt:
3698	// empty
3699	{ $$ = nullptr; }
3700	\| '=' assignment_expression
3701	{ $$ = $2; }
3702	;
3703
3704	%%
3705
3706	// ----end of grammar----
3707
3708	// Local Variables: //
3709	// mode: c++ //
3710	// tab-width: 4 //
3711	// compile-command: "make install" //
3712	// End: //

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