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parser.yy @ 44adf1b

Last change on this file since 44adf1b was 44adf1b, checked in by Andrew Beach <ajbeach@…>, 2 months ago
Removed casts around get_next (also replaced with direct field access) that are no longer needed.
Property mode set to `100644`
File size: 176.5 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 4 08:44:25 2024
13	// Update Count : 6562
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 <sstream>
47	#include <stack>
48	using namespace std;
49
50	#include "DeclarationNode.h" // for DeclarationNode, ...
51	#include "ExpressionNode.h" // for ExpressionNode, ...
52	#include "InitializerNode.h" // for InitializerNode, ...
53	#include "ParserTypes.h"
54	#include "StatementNode.h" // for build_...
55	#include "TypedefTable.h"
56	#include "TypeData.h"
57	#include "Common/SemanticError.h" // error_str
58	#include "Common/utility.h" // for maybeMoveBuild, maybeBuild, CodeLo...
59
60	// lex uses __null in a boolean context, it's fine.
61	#ifdef __clang__
62	#pragma GCC diagnostic ignored "-Wparentheses-equality"
63	#endif
64
65	extern DeclarationNode * parseTree;
66	extern ast::Linkage::Spec linkage;
67	extern TypedefTable typedefTable;
68
69	stack<ast::Linkage::Spec> linkageStack;
70
71	bool appendStr( string & to, string & from ) {
72	// 1. Multiple strings are concatenated into a single string but not combined internally. The reason is that
73	// "\x12" "3" is treated as 2 characters versus 1 because "escape sequences are converted into single members of
74	// the execution character set just prior to adjacent string literal concatenation" (C11, Section 6.4.5-8). It is
75	// easier to let the C compiler handle this case.
76	//
77	// 2. String encodings are transformed into canonical form (one encoding at start) so the encoding can be found
78	// without searching the string, e.g.: "abc" L"def" L"ghi" => L"abc" "def" "ghi". Multiple encodings must match,
79	// e.g., u"a" U"b" L"c" is disallowed.
80
81	if ( from[0] != '"' ) { // encoding ?
82	if ( to[0] != '"' ) { // encoding ?
83	if ( to[0] != from[0] \|\| to[1] != from[1] ) { // different encodings ?
84	yyerror( "non-matching string encodings for string-literal concatenation" );
85	return false; // parse error, must call YYERROR in action
86	} else if ( from[1] == '8' ) {
87	from.erase( 0, 1 ); // remove 2nd encoding
88	} // if
89	} else {
90	if ( from[1] == '8' ) { // move encoding to start
91	to = "u8" + to;
92	from.erase( 0, 1 ); // remove 2nd encoding
93	} else {
94	to = from[0] + to;
95	} // if
96	} // if
97	from.erase( 0, 1 ); // remove 2nd encoding
98	} // if
99	to += " " + from; // concatenated into single string
100	return true;
101	} // appendStr
102
103	DeclarationNode * distAttr( DeclarationNode * typeSpec, DeclarationNode * declList ) {
104	// Distribute type specifier across all declared variables, e.g., static, const, __attribute__.
105	assert( declList );
106
107	// Do not distribute attributes for aggregates because the attributes surrounding the aggregate belong it not the
108	// variables in the declaration list, e.g.,
109	//
110	// struct __attribute__(( aligned(128) )) S { ...
111	// } v1 __attribute__(( aligned(64) )), v2 __attribute__(( aligned(32) )), v3;
112	// struct S v4;
113	//
114	// v1 => 64, v2 =>32, v3 => 128, v2 => 128
115	//
116	// Anonymous aggregates are a special case because there is no aggregate to bind the attribute to; hence it floats
117	// to the declaration list.
118	//
119	// struct __attribute__(( aligned(128) )) /anonymous / { ... } v1;
120	//
121	// v1 => 128
122
123	bool copyattr = ! (typeSpec->type && typeSpec->type->kind == TypeData::Aggregate && ! typeSpec->type->aggregate.anon );
124
125	// addType copies the type information for the aggregate instances from typeSpec into cl's aggInst.aggregate.
126	DeclarationNode * cl = (new DeclarationNode)->addType( typeSpec ); // typeSpec IS DELETED!!!
127
128	// Start at second variable in declaration list and clone the type specifiers for each variable.
129	for ( DeclarationNode * cur = declList->next ; cur != nullptr; cur = cur->next ) {
130	cl->cloneBaseType( cur, copyattr ); // cur is modified
131	} // for
132
133	// Add first variable in declaration list with hidden type information in aggInst.aggregate, which is used by
134	// extractType to recover the type for the aggregate instances.
135	declList->addType( cl, copyattr ); // cl IS DELETED!!!
136	return declList;
137	} // distAttr
138
139	void distExt( DeclarationNode * declaration ) {
140	// distribute EXTENSION across all declarations
141	for ( DeclarationNode *iter = declaration ; iter != nullptr ; iter = iter->next ) {
142	iter->set_extension( true );
143	} // for
144	} // distExt
145
146	void distInl( DeclarationNode * declaration ) {
147	// distribute INLINE across all declarations
148	for ( DeclarationNode *iter = declaration ; iter != nullptr ; iter = iter->next ) {
149	iter->set_inLine( true );
150	} // for
151	} // distInl
152
153	void distQual( DeclarationNode * declaration, DeclarationNode * qualifiers ) {
154	// distribute qualifiers across all non-variable declarations in a distribution statemement
155	for ( DeclarationNode * iter = declaration ; iter != nullptr ; iter = iter->next ) {
156	// SKULLDUGGERY: Distributions are parsed inside out, so qualifiers are added to declarations inside out. Since
157	// addQualifiers appends to the back of the list, the forall clauses are in the wrong order (right to left). To
158	// get the qualifiers in the correct order and still use addQualifiers (otherwise, 90% of addQualifiers has to
159	// be copied to add to front), the appropriate forall pointers are interchanged before calling addQualifiers.
160	DeclarationNode * clone = qualifiers->clone();
161	if ( qualifiers->type ) { // forall clause ? (handles SC)
162	if ( iter->type->kind == TypeData::Aggregate ) { // struct/union ?
163	swap( clone->type->forall, iter->type->aggregate.params );
164	iter->addQualifiers( clone );
165	} else if ( iter->type->kind == TypeData::AggregateInst && iter->type->aggInst.aggregate->aggregate.body ) { // struct/union ?
166	// Create temporary node to hold aggregate, call addQualifiers as above, then put nodes back together.
167	DeclarationNode newnode;
168	swap( newnode.type, iter->type->aggInst.aggregate );
169	swap( clone->type->forall, newnode.type->aggregate.params );
170	newnode.addQualifiers( clone );
171	swap( newnode.type, iter->type->aggInst.aggregate );
172	} else if ( iter->type->kind == TypeData::Function ) { // routines ?
173	swap( clone->type->forall, iter->type->forall );
174	iter->addQualifiers( clone );
175	} // if
176	} else { // just SC qualifiers
177	iter->addQualifiers( clone );
178	} // if
179	} // for
180	delete qualifiers;
181	} // distQual
182
183	// There is an ambiguity for inline generic-routine return-types and generic routines.
184	// forall( otype T ) struct S { int i; } bar( T ) {}
185	// Does the forall bind to the struct or the routine, and how would it be possible to explicitly specify the binding.
186	// forall( otype T ) struct S { int T; } forall( otype W ) bar( W ) {}
187	// Currently, the forall is associated with the routine, and the generic type has to be separately defined:
188	// forall( otype T ) struct S { int T; };
189	// forall( otype W ) bar( W ) {}
190
191	void rebindForall( DeclarationNode * declSpec, DeclarationNode * funcDecl ) {
192	if ( declSpec->type->kind == TypeData::Aggregate ) { // ignore aggregate definition
193	funcDecl->type->forall = declSpec->type->aggregate.params; // move forall from aggregate to function type
194	declSpec->type->aggregate.params = nullptr;
195	} // if
196	} // rebindForall
197
198	string * build_postfix_name( string * name ) {
199	name = string("__postfix_func_") + name;
200	return name;
201	} // build_postfix_name
202
203	DeclarationNode * fieldDecl( DeclarationNode * typeSpec, DeclarationNode * fieldList ) {
204	if ( ! fieldList ) { // field declarator ?
205	if ( ! ( typeSpec->type && (typeSpec->type->kind == TypeData::Aggregate \|\| typeSpec->type->kind == TypeData::Enum) ) ) {
206	stringstream ss;
207	// printf( "fieldDecl1 typeSpec %p\n", typeSpec ); typeSpec->type->print( std::cout );
208	SemanticWarning( yylloc, Warning::SuperfluousDecl, ss.str().c_str() );
209	return nullptr;
210	} // if
211	// printf( "fieldDecl2 typeSpec %p\n", typeSpec ); typeSpec->type->print( std::cout );
212	fieldList = DeclarationNode::newName( nullptr );
213	} // if
214
215	// printf( "fieldDecl3 typeSpec %p\n", typeSpec ); typeSpec->print( std::cout, 0 );
216	DeclarationNode * temp = distAttr( typeSpec, fieldList ); // mark all fields in list
217	// printf( "fieldDecl4 temp %p\n", temp ); temp->print( std::cout, 0 );
218	return temp;
219	} // fieldDecl
220
221	#define NEW_ZERO new ExpressionNode( build_constantInteger( yylloc, *new string( "0" ) ) )
222	#define NEW_ONE new ExpressionNode( build_constantInteger( yylloc, *new string( "1" ) ) )
223	#define UPDOWN( compop, left, right ) (compop == OperKinds::LThan \|\| compop == OperKinds::LEThan ? left : right)
224	#define MISSING_ANON_FIELD "syntax error, missing loop fields with an anonymous loop index is meaningless as loop index is unavailable in loop body."
225	#define MISSING_LOW "syntax error, missing low value for up-to range so index is uninitialized."
226	#define MISSING_HIGH "syntax error, missing high value for down-to range so index is uninitialized."
227
228	static ForCtrl * makeForCtrl(
229	const CodeLocation & location,
230	DeclarationNode * init,
231	enum OperKinds compop,
232	ExpressionNode * comp,
233	ExpressionNode * inc ) {
234	// Wrap both comp/inc if they are non-null.
235	if ( comp ) comp = new ExpressionNode( build_binary_val( location,
236	compop,
237	new ExpressionNode( build_varref( location, new string( *init->name ) ) ),
238	comp ) );
239	if ( inc ) inc = new ExpressionNode( build_binary_val( location,
240	// choose += or -= for upto/downto
241	compop == OperKinds::LThan \|\| compop == OperKinds::LEThan ? OperKinds::PlusAssn : OperKinds::MinusAssn,
242	new ExpressionNode( build_varref( location, new string( *init->name ) ) ),
243	inc ) );
244	// The StatementNode call frees init->name, it must happen later.
245	return new ForCtrl( new StatementNode( init ), comp, inc );
246	}
247
248	ForCtrl * forCtrl( const CodeLocation & location, DeclarationNode * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
249	if ( index->initializer ) {
250	SemanticError( yylloc, "syntax error, direct initialization disallowed. Use instead: type var; initialization ~ comparison ~ increment." );
251	} // if
252	if ( index->next ) {
253	SemanticError( yylloc, "syntax error, multiple loop indexes disallowed in for-loop declaration." );
254	} // if
255	DeclarationNode * initDecl = index->addInitializer( new InitializerNode( start ) );
256	return makeForCtrl( location, initDecl, compop, comp, inc );
257	} // forCtrl
258
259	ForCtrl * forCtrl( const CodeLocation & location, ExpressionNode * type, string * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
260	ast::ConstantExpr * constant = dynamic_cast<ast::ConstantExpr *>(type->expr.get());
261	if ( constant && (constant->rep == "0" \|\| constant->rep == "1") ) {
262	type = new ExpressionNode( new ast::CastExpr( location, maybeMoveBuild(type), new ast::BasicType( ast::BasicType::SignedInt ) ) );
263	} // if
264	DeclarationNode * initDecl = distAttr(
265	DeclarationNode::newTypeof( type, true ),
266	DeclarationNode::newName( index )->addInitializer( new InitializerNode( start ) )
267	);
268	return makeForCtrl( location, initDecl, compop, comp, inc );
269	} // forCtrl
270
271	ForCtrl * forCtrl( const CodeLocation & location, ExpressionNode * type, ExpressionNode * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
272	if ( auto identifier = dynamic_cast<ast::NameExpr *>(index->expr.get()) ) {
273	return forCtrl( location, type, new string( identifier->name ), start, compop, comp, inc );
274	} else if ( auto commaExpr = dynamic_cast<ast::CommaExpr *>( index->expr.get() ) ) {
275	if ( auto identifier = commaExpr->arg1.as<ast::NameExpr>() ) {
276	return forCtrl( location, type, new string( identifier->name ), start, compop, comp, inc );
277	} else {
278	SemanticError( yylloc, "syntax error, loop-index name missing. Expression disallowed." ); return nullptr;
279	} // if
280	} else {
281	SemanticError( yylloc, "syntax error, loop-index name missing. Expression disallowed." ); return nullptr;
282	} // if
283	} // forCtrl
284
285	static void IdentifierBeforeIdentifier( string & identifier1, string & identifier2, const char * kind ) {
286	SemanticError( yylloc, "syntax error, adjacent identifiers \"%s\" and \"%s\" are not meaningful in an %s.\n"
287	"Possible cause is misspelled type name or missing generic parameter.",
288	identifier1.c_str(), identifier2.c_str(), kind );
289	} // IdentifierBeforeIdentifier
290
291	static void IdentifierBeforeType( string & identifier, const char * kind ) {
292	SemanticError( yylloc, "syntax error, identifier \"%s\" cannot appear before a %s.\n"
293	"Possible cause is misspelled storage/CV qualifier, misspelled typename, or missing generic parameter.",
294	identifier.c_str(), kind );
295	} // IdentifierBeforeType
296
297	bool forall = false; // aggregate have one or more forall qualifiers ?
298
299	// https://www.gnu.org/software/bison/manual/bison.html#Location-Type
300	#define YYLLOC_DEFAULT(Cur, Rhs, N) \
301	if ( N ) { \
302	(Cur).first_line = YYRHSLOC( Rhs, 1 ).first_line; \
303	(Cur).first_column = YYRHSLOC( Rhs, 1 ).first_column; \
304	(Cur).last_line = YYRHSLOC( Rhs, N ).last_line; \
305	(Cur).last_column = YYRHSLOC( Rhs, N ).last_column; \
306	(Cur).filename = YYRHSLOC( Rhs, 1 ).filename; \
307	} else { \
308	(Cur).first_line = (Cur).last_line = YYRHSLOC( Rhs, 0 ).last_line; \
309	(Cur).first_column = (Cur).last_column = YYRHSLOC( Rhs, 0 ).last_column; \
310	(Cur).filename = YYRHSLOC( Rhs, 0 ).filename; \
311	}
312	%}
313
314	%define parse.error verbose
315
316	// Types declaration for productions
317
318	%union {
319	Token tok;
320	ExpressionNode * expr;
321	DeclarationNode * decl;
322	ast::AggregateDecl::Aggregate aggKey;
323	ast::TypeDecl::Kind tclass;
324	StatementNode * stmt;
325	ClauseNode * clause;
326	ast::WaitForStmt * wfs;
327	ast::WaitUntilStmt::ClauseNode * wucn;
328	CondCtl * ifctl;
329	ForCtrl * forctl;
330	LabelNode * labels;
331	InitializerNode * init;
332	OperKinds oper;
333	std::string * str;
334	bool is_volatile;
335	EnumHiding enum_hiding;
336	ast::ExceptionKind except_kind;
337	ast::GenericExpr * genexpr;
338	}
339
340	// ********************** TERMINAL TOKENS ******************************
341
342	// keywords
343	%token TYPEDEF
344	%token EXTERN STATIC AUTO REGISTER
345	%token THREADLOCALGCC THREADLOCALC11 // GCC, C11
346	%token INLINE FORTRAN // C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
347	%token NORETURN // C11
348	%token CONST VOLATILE
349	%token RESTRICT // C99
350	%token ATOMIC // C11
351	%token FORALL MUTEX VIRTUAL VTABLE COERCE // CFA
352	%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED
353	%token BOOL COMPLEX IMAGINARY // C99
354	%token INT128 UINT128 uuFLOAT80 uuFLOAT128 // GCC
355	%token uFLOAT16 uFLOAT32 uFLOAT32X uFLOAT64 uFLOAT64X uFLOAT128 // GCC
356	%token DECIMAL32 DECIMAL64 DECIMAL128 // GCC
357	%token ZERO_T ONE_T // CFA
358	%token SIZEOF TYPEOF VA_LIST VA_ARG AUTO_TYPE // GCC
359	%token OFFSETOF BASETYPEOF TYPEID // CFA
360	%token ENUM STRUCT UNION
361	%token EXCEPTION // CFA
362	%token GENERATOR COROUTINE MONITOR THREAD // CFA
363	%token OTYPE FTYPE DTYPE TTYPE TRAIT // CFA
364	// %token RESUME // CFA
365	%token LABEL // GCC
366	%token SUSPEND // CFA
367	%token ATTRIBUTE EXTENSION // GCC
368	%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
369	%token CHOOSE FALLTHRU FALLTHROUGH WITH WHEN WAITFOR WAITUNTIL // CFA
370	%token CORUN COFOR
371	%token DISABLE ENABLE TRY THROW THROWRESUME AT // CFA
372	%token ASM // C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
373	%token ALIGNAS ALIGNOF GENERIC STATICASSERT // C11
374
375	// names and constants: lexer differentiates between identifier and typedef names
376	%token<tok> IDENTIFIER TYPEDIMname TYPEDEFname TYPEGENname
377	%token<tok> TIMEOUT WAND WOR CATCH RECOVER CATCHRESUME FIXUP FINALLY // CFA
378	%token<tok> INTEGERconstant CHARACTERconstant STRINGliteral
379	%token<tok> DIRECTIVE
380	// Floating point constant is broken into three kinds of tokens because of the ambiguity with tuple indexing and
381	// overloading constants 0/1, e.g., x.1 is lexed as (x)(.1), where (.1) is a factional constant, but is semantically
382	// converted into the tuple index (.)(1). e.g., 3.x
383	%token<tok> FLOATING_DECIMALconstant FLOATING_FRACTIONconstant FLOATINGconstant
384
385	// multi-character operators
386	%token ARROW // ->
387	%token ICR DECR // ++ --
388	%token LS RS // << >>
389	%token LE GE EQ NE // <= >= == !=
390	%token ANDAND OROR // && \|\|
391	%token ATTR ELLIPSIS // @@ ...
392
393	%token EXPassign MULTassign DIVassign MODassign // \= *= /= %=
394	%token PLUSassign MINUSassign // += -=
395	%token LSassign RSassign // <<= >>=
396	%token ANDassign ERassign ORassign // &= ^= \|=
397
398	%token ErangeUpEq ErangeDown ErangeDownEq // ~= -~ -~=
399	%token ATassign // @=
400
401	%type<tok> identifier identifier_at identifier_or_type_name attr_name
402	%type<tok> quasi_keyword
403	%type<expr> string_literal
404	%type<str> string_literal_list
405
406	%type<enum_hiding> hide_opt visible_hide_opt
407
408	// expressions
409	%type<expr> constant
410	%type<expr> tuple tuple_expression_list
411	%type<oper> ptrref_operator unary_operator assignment_operator simple_assignment_operator compound_assignment_operator
412	%type<expr> primary_expression postfix_expression unary_expression
413	%type<expr> cast_expression_list cast_expression exponential_expression multiplicative_expression additive_expression
414	%type<expr> shift_expression relational_expression equality_expression
415	%type<expr> AND_expression exclusive_OR_expression inclusive_OR_expression
416	%type<expr> logical_AND_expression logical_OR_expression
417	%type<expr> conditional_expression constant_expression assignment_expression assignment_expression_opt
418	%type<expr> comma_expression comma_expression_opt
419	%type<expr> argument_expression_list_opt argument_expression_list argument_expression default_initializer_opt
420	%type<ifctl> conditional_declaration
421	%type<forctl> for_control_expression for_control_expression_list
422	%type<oper> upupeq updown updowneq downupdowneq
423	%type<expr> subrange
424	%type<decl> asm_name_opt
425	%type<expr> asm_operands_opt asm_operands_list asm_operand
426	%type<labels> label_list
427	%type<expr> asm_clobbers_list_opt
428	%type<is_volatile> asm_volatile_opt
429	%type<expr> handler_predicate_opt
430	%type<genexpr> generic_association generic_assoc_list
431
432	// statements
433	%type<stmt> statement labeled_statement compound_statement
434	%type<stmt> statement_decl statement_decl_list statement_list_nodecl
435	%type<stmt> selection_statement
436	%type<clause> switch_clause_list_opt switch_clause_list
437	%type<expr> case_value
438	%type<clause> case_clause case_value_list case_label case_label_list
439	%type<stmt> iteration_statement jump_statement
440	%type<stmt> expression_statement asm_statement
441	%type<stmt> with_statement
442	%type<expr> with_clause_opt
443	%type<stmt> corun_statement cofor_statement
444	%type<stmt> exception_statement
445	%type<clause> handler_clause finally_clause
446	%type<except_kind> handler_key
447	%type<stmt> mutex_statement
448	%type<expr> when_clause when_clause_opt waitfor waituntil timeout
449	%type<stmt> waitfor_statement waituntil_statement
450	%type<wfs> wor_waitfor_clause
451	%type<wucn> waituntil_clause wand_waituntil_clause wor_waituntil_clause
452
453	// declarations
454	%type<decl> abstract_declarator abstract_ptr abstract_array abstract_function array_dimension multi_array_dimension
455	%type<decl> abstract_parameter_declarator_opt abstract_parameter_declarator abstract_parameter_ptr abstract_parameter_array abstract_parameter_function array_parameter_dimension array_parameter_1st_dimension
456	%type<decl> abstract_parameter_declaration
457
458	%type<aggKey> aggregate_key aggregate_data aggregate_control
459	%type<decl> aggregate_type aggregate_type_nobody
460
461	%type<decl> assertion assertion_list assertion_list_opt
462
463	%type<expr> bit_subrange_size_opt bit_subrange_size
464
465	%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type indirect_type
466	%type<decl> vtable vtable_opt default_opt
467
468	%type<decl> trait_declaration trait_declaration_list trait_declaring_list trait_specifier
469
470	%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
471	%type<decl> declaration_specifier declaration_specifier_nobody declarator declaring_list
472
473	%type<decl> elaborated_type elaborated_type_nobody
474
475	%type<decl> enumerator_list enum_type enum_type_nobody
476	%type<init> enumerator_value_opt
477
478	%type<decl> external_definition external_definition_list external_definition_list_opt
479
480	%type<decl> exception_declaration
481
482	%type<decl> field_declaration_list_opt field_declaration field_declaring_list_opt field_declarator field_abstract_list_opt field_abstract
483	%type<expr> field field_name_list field_name fraction_constants_opt
484
485	%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr
486
487	%type<decl> identifier_parameter_declarator identifier_parameter_ptr identifier_parameter_array identifier_parameter_function
488	%type<decl> identifier_list
489
490	%type<decl> cfa_abstract_array cfa_abstract_declarator_no_tuple cfa_abstract_declarator_tuple
491	%type<decl> cfa_abstract_function cfa_abstract_parameter_declaration cfa_abstract_parameter_list
492	%type<decl> cfa_abstract_ptr cfa_abstract_tuple
493
494	%type<decl> cfa_array_parameter_1st_dimension
495
496	%type<decl> cfa_trait_declaring_list cfa_declaration cfa_field_declaring_list cfa_field_abstract_list
497	%type<decl> cfa_function_declaration cfa_function_return cfa_function_specifier
498
499	%type<decl> cfa_identifier_parameter_array cfa_identifier_parameter_declarator_no_tuple
500	%type<decl> cfa_identifier_parameter_declarator_tuple cfa_identifier_parameter_ptr
501
502	%type<decl> cfa_parameter_declaration cfa_parameter_list cfa_parameter_list_ellipsis_opt
503
504	%type<decl> cfa_typedef_declaration cfa_variable_declaration cfa_variable_specifier
505
506	%type<decl> c_declaration static_assert
507	%type<decl> KR_function_declarator KR_function_no_ptr KR_function_ptr KR_function_array
508	%type<decl> KR_parameter_list KR_parameter_list_opt
509
510	%type<decl> parameter_declaration parameter_list parameter_list_ellipsis_opt
511
512	%type<decl> paren_identifier paren_type
513
514	%type<decl> storage_class storage_class_list
515
516	%type<decl> sue_declaration_specifier sue_declaration_specifier_nobody sue_type_specifier sue_type_specifier_nobody
517
518	%type<tclass> type_class new_type_class
519	%type<decl> type_declarator type_declarator_name type_declaring_list
520
521	%type<decl> type_declaration_specifier type_type_specifier type_name typegen_name
522	%type<decl> typedef_name typedef_declaration typedef_expression
523
524	%type<decl> variable_type_redeclarator variable_type_ptr variable_type_array variable_type_function
525	%type<decl> general_function_declarator function_type_redeclarator function_type_array function_type_no_ptr function_type_ptr
526
527	%type<decl> type_parameter_redeclarator type_parameter_ptr type_parameter_array type_parameter_function
528
529	%type<decl> type type_no_function
530	%type<decl> type_parameter type_parameter_list type_initializer_opt
531
532	%type<expr> type_parameters_opt type_list array_type_list // array_dimension_list
533
534	%type<decl> type_qualifier type_qualifier_name forall type_qualifier_list_opt type_qualifier_list
535	%type<decl> type_specifier type_specifier_nobody
536
537	%type<decl> variable_declarator variable_ptr variable_array variable_function
538	%type<decl> variable_abstract_declarator variable_abstract_ptr variable_abstract_array variable_abstract_function
539
540	%type<decl> attribute_list_opt attribute_list attribute attribute_name_list attribute_name
541
542	// initializers
543	%type<init> initializer initializer_list_opt initializer_opt
544
545	// designators
546	%type<expr> designator designator_list designation
547
548
549	// Handle shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string is ambiguous:
550	// .---------. matches IF '(' comma_expression ')' statement . (reduce)
551	// if ( C ) S1 else S2
552	// `-----------------' matches IF '(' comma_expression ')' statement . (shift) ELSE statement */
553	// Similar issues exit with the waitfor statement.
554
555	// Order of these lines matters (low-to-high precedence). THEN is left associative over WAND/WOR/TIMEOUT/ELSE, WAND/WOR
556	// is left associative over TIMEOUT/ELSE, and TIMEOUT is left associative over ELSE.
557	%precedence THEN // rule precedence for IF/WAITFOR statement
558	%precedence ANDAND // token precedence for start of WAND in WAITFOR statement
559	%precedence WAND // token precedence for start of WAND in WAITFOR statement
560	%precedence OROR // token precedence for start of WOR in WAITFOR statement
561	%precedence WOR // token precedence for start of WOR in WAITFOR statement
562	%precedence TIMEOUT // token precedence for start of TIMEOUT in WAITFOR statement
563	%precedence CATCH // token precedence for start of TIMEOUT in WAITFOR statement
564	%precedence RECOVER // token precedence for start of TIMEOUT in WAITFOR statement
565	%precedence CATCHRESUME // token precedence for start of TIMEOUT in WAITFOR statement
566	%precedence FIXUP // token precedence for start of TIMEOUT in WAITFOR statement
567	%precedence FINALLY // token precedence for start of TIMEOUT in WAITFOR statement
568	%precedence ELSE // token precedence for start of else clause in IF/WAITFOR statement
569
570
571	// Handle shift/reduce conflict for generic type by shifting the '(' token. For example, this string is ambiguous:
572	// forall( otype T ) struct Foo { T v; };
573	// .-----. matches pointer to function returning a generic (which is impossible without a type)
574	// Foo ( *fp )( int );
575	// `---' matches start of TYPEGENname '('
576	// must be:
577	// Foo( int ) ( *fp )( int );
578	// The same problem occurs here:
579	// forall( otype T ) struct Foo { T v; } ( *fp )( int );
580	// must be:
581	// forall( otype T ) struct Foo { T v; } ( int ) ( *fp )( int );
582
583	// Order of these lines matters (low-to-high precedence).
584	%precedence TYPEGENname
585	%precedence '}'
586	%precedence '('
587
588	// %precedence RESUME
589	// %precedence '{'
590	// %precedence ')'
591
592	%locations // support location tracking for error messages
593
594	%start translation_unit // parse-tree root
595
596	%%
597	// ********************** Namespace Management ******************************
598
599	// The C grammar is not context free because it relies on the distinct terminal symbols "identifier" and "TYPEDEFname",
600	// which are lexically identical.
601	//
602	// typedef int foo; // identifier foo must now be scanned as TYPEDEFname
603	// foo f; // to allow it to appear in this context
604	//
605	// While it may be possible to write a purely context-free grammar, such a grammar would obscure the relationship
606	// between syntactic and semantic constructs. Cforall compounds this problem by introducing type names local to the
607	// scope of a declaration (for instance, those introduced through "forall" qualifiers), and by introducing "type
608	// generators" -- parameterized types. This latter type name creates a third class of identifiers, "TYPEGENname", which
609	// must be distinguished by the lexical scanner.
610	//
611	// Since the scanner cannot distinguish among the different classes of identifiers without some context information,
612	// there is a type table (typedefTable), which holds type names and identifiers that override type names, for each named
613	// scope. During parsing, semantic actions update the type table by adding new identifiers in the current scope. For
614	// each context that introduces a name scope, a new level is created in the type table and that level is popped on
615	// exiting the scope. Since type names can be local to a particular declaration, each declaration is itself a scope.
616	// This requires distinguishing between type names that are local to the current declaration scope and those that
617	// persist past the end of the declaration (i.e., names defined in "typedef" or "otype" declarations).
618	//
619	// The non-terminals "push" and "pop" denote the opening and closing of named scopes. Every push has a matching pop in
620	// the production rule. There are multiple lists of declarations, where each declaration is a named scope, so pop/push
621	// around the list separator.
622	//
623	// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
624	// push pop push pop
625
626	push:
627	{ typedefTable.enterScope(); }
628	;
629
630	pop:
631	{ typedefTable.leaveScope(); }
632	;
633
634	// ********************** CONSTANTS ******************************
635
636	constant:
637	// ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
638	INTEGERconstant { $$ = new ExpressionNode( build_constantInteger( yylloc, *$1 ) ); }
639	\| FLOATING_DECIMALconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
640	\| FLOATING_FRACTIONconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
641	\| FLOATINGconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
642	\| CHARACTERconstant { $$ = new ExpressionNode( build_constantChar( yylloc, *$1 ) ); }
643	;
644
645	quasi_keyword: // CFA
646	TIMEOUT
647	\| WAND
648	\| WOR
649	\| CATCH
650	\| RECOVER
651	\| CATCHRESUME
652	\| FIXUP
653	\| FINALLY
654	;
655
656	identifier:
657	IDENTIFIER
658	\| quasi_keyword
659	;
660
661	identifier_at:
662	identifier
663	\| '@' // CFA
664	{ Token tok = { new string( DeclarationNode::anonymous.newName() ), yylval.tok.loc }; $$ = tok; }
665	;
666
667	string_literal:
668	string_literal_list { $$ = new ExpressionNode( build_constantStr( yylloc, *$1 ) ); }
669	;
670
671	string_literal_list: // juxtaposed strings are concatenated
672	STRINGliteral { $$ = $1; } // conversion from tok to str
673	\| string_literal_list STRINGliteral
674	{
675	if ( ! appendStr( $1, $2 ) ) YYERROR; // append 2nd juxtaposed string to 1st
676	delete $2; // allocated by lexer
677	$$ = $1; // conversion from tok to str
678	}
679	;
680
681	// ********************** EXPRESSIONS ******************************
682
683	primary_expression:
684	IDENTIFIER // typedef name cannot be used as a variable name
685	{ $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
686	\| quasi_keyword
687	{ $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
688	\| TYPEDIMname // CFA, generic length argument
689	// { $$ = new ExpressionNode( new TypeExpr( maybeMoveBuildType( DeclarationNode::newFromTypedef( $1 ) ) ) ); }
690	// { $$ = new ExpressionNode( build_varref( $1 ) ); }
691	{ $$ = new ExpressionNode( build_dimensionref( yylloc, $1 ) ); }
692	\| tuple
693	\| '(' comma_expression ')'
694	{ $$ = $2; }
695	\| '(' compound_statement ')' // GCC, lambda expression
696	{ $$ = new ExpressionNode( new ast::StmtExpr( yylloc, dynamic_cast<ast::CompoundStmt *>( maybeMoveBuild( $2 ) ) ) ); }
697	\| type_name '.' identifier // CFA, nested type
698	{ $$ = new ExpressionNode( build_qualified_expr( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
699	\| type_name '.' '[' field_name_list ']' // CFA, nested type / tuple field selector
700	{ SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
701	\| GENERIC '(' assignment_expression ',' generic_assoc_list ')' // C11
702	{
703	// add the missing control expression to the GenericExpr and return it
704	$5->control = maybeMoveBuild( $3 );
705	$$ = new ExpressionNode( $5 );
706	}
707	// \| RESUME '(' comma_expression ')'
708	// { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
709	// \| RESUME '(' comma_expression ')' compound_statement
710	// { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
711	\| IDENTIFIER IDENTIFIER // invalid syntax rule
712	{ IdentifierBeforeIdentifier( $1.str, $2.str, "expression" ); $$ = nullptr; }
713	\| IDENTIFIER type_qualifier // invalid syntax rule
714	{ IdentifierBeforeType( *$1.str, "type qualifier" ); $$ = nullptr; }
715	\| IDENTIFIER storage_class // invalid syntax rule
716	{ IdentifierBeforeType( *$1.str, "storage class" ); $$ = nullptr; }
717	\| IDENTIFIER basic_type_name // invalid syntax rule
718	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
719	\| IDENTIFIER TYPEDEFname // invalid syntax rule
720	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
721	\| IDENTIFIER TYPEGENname // invalid syntax rule
722	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
723	;
724
725	generic_assoc_list: // C11
726	generic_association
727	\| generic_assoc_list ',' generic_association
728	{
729	// steal the association node from the singleton and delete the wrapper
730	assert( 1 == $3->associations.size() );
731	$1->associations.push_back( $3->associations.front() );
732	delete $3;
733	$$ = $1;
734	}
735	;
736
737	generic_association: // C11
738	type_no_function ':' assignment_expression
739	{
740	// create a GenericExpr wrapper with one association pair
741	$$ = new ast::GenericExpr( yylloc, nullptr, { { maybeMoveBuildType( $1 ), maybeMoveBuild( $3 ) } } );
742	}
743	\| DEFAULT ':' assignment_expression
744	{ $$ = new ast::GenericExpr( yylloc, nullptr, { { maybeMoveBuild( $3 ) } } ); }
745	;
746
747	postfix_expression:
748	primary_expression
749	\| postfix_expression '[' assignment_expression ',' tuple_expression_list ']'
750	// Historic, transitional: Disallow commas in subscripts.
751	// Switching to this behaviour may help check if a C compatibilty case uses comma-exprs in subscripts.
752	// Current: Commas in subscripts make tuples.
753	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, new ExpressionNode( build_tuple( yylloc, (ExpressionNode *)($3->set_last( $5 ) ) )) ) ); }
754	\| postfix_expression '[' assignment_expression ']'
755	// CFA, comma_expression disallowed in this context because it results in a common user error: subscripting a
756	// matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
757	// little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
758	// equivalent to the old x[i,j].
759	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
760	\| constant '[' assignment_expression ']' // 3[a], 'a'[a], 3.5[a]
761	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
762	\| string_literal '[' assignment_expression ']' // "abc"[3], 3["abc"]
763	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
764	\| postfix_expression '{' argument_expression_list_opt '}' // CFA, constructor call
765	{
766	Token fn;
767	fn.str = new std::string( "?{}" ); // location undefined - use location of '{'?
768	$$ = new ExpressionNode( new ast::ConstructorExpr( yylloc, build_func( yylloc, new ExpressionNode( build_varref( yylloc, fn ) ), (ExpressionNode *)( $1 )->set_last( $3 ) ) ) );
769	}
770	\| postfix_expression '(' argument_expression_list_opt ')'
771	{ $$ = new ExpressionNode( build_func( yylloc, $1, $3 ) ); }
772	\| VA_ARG '(' primary_expression ',' declaration_specifier_nobody abstract_parameter_declarator_opt ')'
773	// { SemanticError( yylloc, "va_arg is currently unimplemented." ); $$ = nullptr; }
774	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, new string( "__builtin_va_arg") ) ),
775	(ExpressionNode )($3->set_last( (ExpressionNode )($6 ? $6->addType( $5 ) : $5) )) ) ); }
776	\| postfix_expression '`' identifier // CFA, postfix call
777	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
778	\| constant '`' identifier // CFA, postfix call
779	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
780	\| string_literal '`' identifier // CFA, postfix call
781	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
782
783	// SKULLDUGGERY: The typedef table used for parsing does not store fields in structures. To parse a qualified
784	// name, it is assumed all name-tokens after the first are identifiers, regardless of how the lexer identifies
785	// them. For example:
786	//
787	// struct S;
788	// forall(T) struct T;
789	// union U;
790	// enum E { S, T, E };
791	// struct Z { int S, T, Z, E, U; };
792	// void fred () {
793	// Z z;
794	// z.S; // lexer returns S is TYPEDEFname
795	// z.T; // lexer returns T is TYPEGENname
796	// z.Z; // lexer returns Z is TYPEDEFname
797	// z.U; // lexer returns U is TYPEDEFname
798	// z.E; // lexer returns E is TYPEDEFname
799	// }
800	\| postfix_expression '.' identifier
801	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
802	\| postfix_expression '.' TYPEDEFname // CFA, SKULLDUGGERY
803	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
804	\| postfix_expression '.' TYPEGENname // CFA, SKULLDUGGERY
805	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
806
807	\| postfix_expression '.' INTEGERconstant // CFA, tuple index
808	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_constantInteger( yylloc, *$3 ) ) ); }
809	\| postfix_expression FLOATING_FRACTIONconstant // CFA, tuple index
810	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_field_name_FLOATING_FRACTIONconstant( yylloc, *$2 ) ) ); }
811	\| postfix_expression '.' '[' field_name_list ']' // CFA, tuple field selector
812	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
813	\| postfix_expression '.' aggregate_control
814	{ $$ = new ExpressionNode( build_keyword_cast( yylloc, $3, $1 ) ); }
815	\| postfix_expression ARROW identifier
816	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
817	\| postfix_expression ARROW INTEGERconstant // CFA, tuple index
818	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_constantInteger( yylloc, *$3 ) ) ); }
819	\| postfix_expression ARROW '[' field_name_list ']' // CFA, tuple field selector
820	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
821	\| postfix_expression ICR
822	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::IncrPost, $1 ) ); }
823	\| postfix_expression DECR
824	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::DecrPost, $1 ) ); }
825	\| '(' type_no_function ')' '{' initializer_list_opt comma_opt '}' // C99, compound-literal
826	{ $$ = new ExpressionNode( build_compoundLiteral( yylloc, $2, new InitializerNode( $5, true ) ) ); }
827	\| '(' type_no_function ')' '@' '{' initializer_list_opt comma_opt '}' // CFA, explicit C compound-literal
828	{ $$ = new ExpressionNode( build_compoundLiteral( yylloc, $2, (new InitializerNode( $6, true ))->set_maybeConstructed( false ) ) ); }
829	\| '^' primary_expression '{' argument_expression_list_opt '}' // CFA, destructor call
830	{
831	Token fn;
832	fn.str = new string( "^?{}" ); // location undefined
833	$$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, fn ) ), (ExpressionNode *)( $2 )->set_last( $4 ) ) );
834	}
835	;
836
837	argument_expression_list_opt:
838	// empty
839	{ $$ = nullptr; }
840	\| argument_expression_list
841	;
842
843	argument_expression_list:
844	argument_expression
845	\| argument_expression_list_opt ',' argument_expression
846	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
847	;
848
849	argument_expression:
850	'@' // CFA, default parameter
851	{ SemanticError( yylloc, "Default parameter for argument is currently unimplemented." ); $$ = nullptr; }
852	// { $$ = new ExpressionNode( build_constantInteger( *new string( "2" ) ) ); }
853	\| assignment_expression
854	;
855
856	field_name_list: // CFA, tuple field selector
857	field
858	\| field_name_list ',' field { $$ = (ExpressionNode *)($1->set_last( $3 )); }
859	;
860
861	field: // CFA, tuple field selector
862	field_name
863	\| FLOATING_DECIMALconstant field
864	{ $$ = new ExpressionNode( build_fieldSel( yylloc, new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( yylloc, *$1 ) ), maybeMoveBuild( $2 ) ) ); }
865	\| FLOATING_DECIMALconstant '[' field_name_list ']'
866	{ $$ = new ExpressionNode( build_fieldSel( yylloc, new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( yylloc, *$1 ) ), build_tuple( yylloc, $3 ) ) ); }
867	\| field_name '.' field
868	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, maybeMoveBuild( $3 ) ) ); }
869	\| field_name '.' '[' field_name_list ']'
870	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
871	\| field_name ARROW field
872	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, maybeMoveBuild( $3 ) ) ); }
873	\| field_name ARROW '[' field_name_list ']'
874	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
875	;
876
877	field_name:
878	INTEGERconstant fraction_constants_opt
879	{ $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_constantInteger( yylloc, *$1 ), $2 ) ); }
880	\| FLOATINGconstant fraction_constants_opt
881	{ $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_field_name_FLOATINGconstant( yylloc, *$1 ), $2 ) ); }
882	\| identifier_at fraction_constants_opt // CFA, allow anonymous fields
883	{
884	$$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_varref( yylloc, $1 ), $2 ) );
885	}
886	;
887
888	fraction_constants_opt:
889	// empty
890	{ $$ = nullptr; }
891	\| fraction_constants_opt FLOATING_FRACTIONconstant
892	{
893	ast::Expr * constant = build_field_name_FLOATING_FRACTIONconstant( yylloc, *$2 );
894	$$ = $1 != nullptr ? new ExpressionNode( build_fieldSel( yylloc, $1, constant ) ) : new ExpressionNode( constant );
895	}
896	;
897
898	unary_expression:
899	postfix_expression
900	// first location where constant/string can have operator applied: sizeof 3/sizeof "abc" still requires
901	// semantics checks, e.g., ++3, 3--, *3, &&3
902	\| constant
903	\| string_literal
904	{ $$ = $1; }
905	\| EXTENSION cast_expression // GCC
906	{ $$ = $2->set_extension( true ); }
907	// '*' ('&') is separated from unary_operator because of shift/reduce conflict in:
908	// { * X; } // dereference X
909	// { * int X; } // CFA declaration of pointer to int
910	\| ptrref_operator cast_expression // CFA
911	{
912	switch ( $1 ) {
913	case OperKinds::AddressOf:
914	$$ = new ExpressionNode( new ast::AddressExpr( maybeMoveBuild( $2 ) ) );
915	break;
916	case OperKinds::PointTo:
917	$$ = new ExpressionNode( build_unary_val( yylloc, $1, $2 ) );
918	break;
919	case OperKinds::And:
920	$$ = new ExpressionNode( new ast::AddressExpr( new ast::AddressExpr( maybeMoveBuild( $2 ) ) ) );
921	break;
922	default:
923	assert( false );
924	}
925	}
926	\| unary_operator cast_expression
927	{ $$ = new ExpressionNode( build_unary_val( yylloc, $1, $2 ) ); }
928	\| ICR unary_expression
929	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::Incr, $2 ) ); }
930	\| DECR unary_expression
931	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::Decr, $2 ) ); }
932	\| SIZEOF unary_expression
933	{ $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuild( $2 ) ) ); }
934	\| SIZEOF '(' type_no_function ')'
935	{ $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
936	\| ALIGNOF unary_expression // GCC, variable alignment
937	{ $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuild( $2 ) ) ); }
938	\| ALIGNOF '(' type_no_function ')' // GCC, type alignment
939	{ $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
940	\| OFFSETOF '(' type_no_function ',' identifier ')'
941	{ $$ = new ExpressionNode( build_offsetOf( yylloc, $3, build_varref( yylloc, $5 ) ) ); }
942	\| TYPEID '(' type_no_function ')'
943	{
944	SemanticError( yylloc, "typeid name is currently unimplemented." ); $$ = nullptr;
945	// $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) );
946	}
947	;
948
949	ptrref_operator:
950	'*' { $$ = OperKinds::PointTo; }
951	\| '&' { $$ = OperKinds::AddressOf; }
952	// GCC, address of label must be handled by semantic check for ref,ref,label
953	\| ANDAND { $$ = OperKinds::And; }
954	;
955
956	unary_operator:
957	'+' { $$ = OperKinds::UnPlus; }
958	\| '-' { $$ = OperKinds::UnMinus; }
959	\| '!' { $$ = OperKinds::Neg; }
960	\| '~' { $$ = OperKinds::BitNeg; }
961	;
962
963	cast_expression:
964	unary_expression
965	\| '(' type_no_function ')' cast_expression
966	{ $$ = new ExpressionNode( build_cast( yylloc, $2, $4 ) ); }
967	\| '(' aggregate_control '&' ')' cast_expression // CFA
968	{ $$ = new ExpressionNode( build_keyword_cast( yylloc, $2, $5 ) ); }
969	\| '(' aggregate_control '*' ')' cast_expression // CFA
970	{ $$ = new ExpressionNode( build_keyword_cast( yylloc, $2, $5 ) ); }
971	\| '(' VIRTUAL ')' cast_expression // CFA
972	{ $$ = new ExpressionNode( new ast::VirtualCastExpr( yylloc, maybeMoveBuild( $4 ), maybeMoveBuildType( nullptr ) ) ); }
973	\| '(' VIRTUAL type_no_function ')' cast_expression // CFA
974	{ $$ = new ExpressionNode( new ast::VirtualCastExpr( yylloc, maybeMoveBuild( $5 ), maybeMoveBuildType( $3 ) ) ); }
975	\| '(' RETURN type_no_function ')' cast_expression // CFA
976	{ $$ = new ExpressionNode( build_cast( yylloc, $3, $5, ast::CastExpr::Return ) ); }
977	\| '(' COERCE type_no_function ')' cast_expression // CFA
978	{ SemanticError( yylloc, "Coerce cast is currently unimplemented." ); $$ = nullptr; }
979	\| '(' qualifier_cast_list ')' cast_expression // CFA
980	{ SemanticError( yylloc, "Qualifier cast is currently unimplemented." ); $$ = nullptr; }
981	// \| '(' type_no_function ')' tuple
982	// { $$ = new ast::ExpressionNode( build_cast( yylloc, $2, $4 ) ); }
983	;
984
985	qualifier_cast_list:
986	cast_modifier type_qualifier_name
987	\| cast_modifier MUTEX
988	\| qualifier_cast_list cast_modifier type_qualifier_name
989	\| qualifier_cast_list cast_modifier MUTEX
990	;
991
992	cast_modifier:
993	'-'
994	\| '+'
995	;
996
997	exponential_expression:
998	cast_expression
999	\| exponential_expression '\\' cast_expression
1000	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Exp, $1, $3 ) ); }
1001	;
1002
1003	multiplicative_expression:
1004	exponential_expression
1005	\| multiplicative_expression '*' exponential_expression
1006	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Mul, $1, $3 ) ); }
1007	\| multiplicative_expression '/' exponential_expression
1008	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Div, $1, $3 ) ); }
1009	\| multiplicative_expression '%' exponential_expression
1010	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Mod, $1, $3 ) ); }
1011	;
1012
1013	additive_expression:
1014	multiplicative_expression
1015	\| additive_expression '+' multiplicative_expression
1016	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Plus, $1, $3 ) ); }
1017	\| additive_expression '-' multiplicative_expression
1018	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Minus, $1, $3 ) ); }
1019	;
1020
1021	shift_expression:
1022	additive_expression
1023	\| shift_expression LS additive_expression
1024	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LShift, $1, $3 ) ); }
1025	\| shift_expression RS additive_expression
1026	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::RShift, $1, $3 ) ); }
1027	;
1028
1029	relational_expression:
1030	shift_expression
1031	\| relational_expression '<' shift_expression
1032	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LThan, $1, $3 ) ); }
1033	\| relational_expression '>' shift_expression
1034	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::GThan, $1, $3 ) ); }
1035	\| relational_expression LE shift_expression
1036	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LEThan, $1, $3 ) ); }
1037	\| relational_expression GE shift_expression
1038	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::GEThan, $1, $3 ) ); }
1039	;
1040
1041	equality_expression:
1042	relational_expression
1043	\| equality_expression EQ relational_expression
1044	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Eq, $1, $3 ) ); }
1045	\| equality_expression NE relational_expression
1046	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Neq, $1, $3 ) ); }
1047	;
1048
1049	AND_expression:
1050	equality_expression
1051	\| AND_expression '&' equality_expression
1052	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::BitAnd, $1, $3 ) ); }
1053	;
1054
1055	exclusive_OR_expression:
1056	AND_expression
1057	\| exclusive_OR_expression '^' AND_expression
1058	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Xor, $1, $3 ) ); }
1059	;
1060
1061	inclusive_OR_expression:
1062	exclusive_OR_expression
1063	\| inclusive_OR_expression '\|' exclusive_OR_expression
1064	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::BitOr, $1, $3 ) ); }
1065	;
1066
1067	logical_AND_expression:
1068	inclusive_OR_expression
1069	\| logical_AND_expression ANDAND inclusive_OR_expression
1070	{ $$ = new ExpressionNode( build_and_or( yylloc, $1, $3, ast::AndExpr ) ); }
1071	;
1072
1073	logical_OR_expression:
1074	logical_AND_expression
1075	\| logical_OR_expression OROR logical_AND_expression
1076	{ $$ = new ExpressionNode( build_and_or( yylloc, $1, $3, ast::OrExpr ) ); }
1077	;
1078
1079	conditional_expression:
1080	logical_OR_expression
1081	\| logical_OR_expression '?' comma_expression ':' conditional_expression
1082	{ $$ = new ExpressionNode( build_cond( yylloc, $1, $3, $5 ) ); }
1083	\| logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
1084	{ $$ = new ExpressionNode( build_cond( yylloc, $1, nullptr, $4 ) ); }
1085	;
1086
1087	constant_expression:
1088	conditional_expression
1089	;
1090
1091	assignment_expression:
1092	// CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
1093	conditional_expression
1094	\| unary_expression assignment_operator assignment_expression
1095	{
1096	// if ( $2 == OperKinds::AtAssn ) {
1097	// SemanticError( yylloc, "C @= assignment is currently unimplemented." ); $$ = nullptr;
1098	// } else {
1099	$$ = new ExpressionNode( build_binary_val( yylloc, $2, $1, $3 ) );
1100	// } // if
1101	}
1102	\| unary_expression '=' '{' initializer_list_opt comma_opt '}'
1103	{ SemanticError( yylloc, "Initializer assignment is currently unimplemented." ); $$ = nullptr; }
1104	;
1105
1106	assignment_expression_opt:
1107	// empty
1108	{ $$ = nullptr; }
1109	\| assignment_expression
1110	;
1111
1112	assignment_operator:
1113	simple_assignment_operator
1114	\| compound_assignment_operator
1115	;
1116
1117	simple_assignment_operator:
1118	'=' { $$ = OperKinds::Assign; }
1119	\| ATassign { $$ = OperKinds::AtAssn; } // CFA
1120	;
1121
1122	compound_assignment_operator:
1123	EXPassign { $$ = OperKinds::ExpAssn; }
1124	\| MULTassign { $$ = OperKinds::MulAssn; }
1125	\| DIVassign { $$ = OperKinds::DivAssn; }
1126	\| MODassign { $$ = OperKinds::ModAssn; }
1127	\| PLUSassign { $$ = OperKinds::PlusAssn; }
1128	\| MINUSassign { $$ = OperKinds::MinusAssn; }
1129	\| LSassign { $$ = OperKinds::LSAssn; }
1130	\| RSassign { $$ = OperKinds::RSAssn; }
1131	\| ANDassign { $$ = OperKinds::AndAssn; }
1132	\| ERassign { $$ = OperKinds::ERAssn; }
1133	\| ORassign { $$ = OperKinds::OrAssn; }
1134	;
1135
1136	tuple: // CFA, tuple
1137	// CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
1138	// comma_expression in cfa_identifier_parameter_array and cfa_abstract_array
1139	// '[' ']'
1140	// { $$ = new ExpressionNode( build_tuple() ); }
1141	// \| '[' push assignment_expression pop ']'
1142	// { $$ = new ExpressionNode( build_tuple( $3 ) ); }
1143	'[' ',' tuple_expression_list ']'
1144	{ $$ = new ExpressionNode( build_tuple( yylloc, (ExpressionNode *)(new ExpressionNode( nullptr ) )->set_last( $3 ) ) ); }
1145	\| '[' push assignment_expression pop ',' tuple_expression_list ']'
1146	{ $$ = new ExpressionNode( build_tuple( yylloc, (ExpressionNode *)($3->set_last( $6 ) ) )); }
1147	;
1148
1149	tuple_expression_list:
1150	assignment_expression
1151	\| '@' // CFA
1152	{ SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1153	\| tuple_expression_list ',' assignment_expression
1154	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
1155	\| tuple_expression_list ',' '@'
1156	{ SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1157	;
1158
1159	comma_expression:
1160	assignment_expression
1161	\| comma_expression ',' assignment_expression
1162	{ $$ = new ExpressionNode( new ast::CommaExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1163	;
1164
1165	comma_expression_opt:
1166	// empty
1167	{ $$ = nullptr; }
1168	\| comma_expression
1169	;
1170
1171	// ************************ STATEMENTS *****************************
1172
1173	statement:
1174	labeled_statement
1175	\| compound_statement
1176	\| expression_statement
1177	\| selection_statement
1178	\| iteration_statement
1179	\| jump_statement
1180	\| with_statement
1181	\| mutex_statement
1182	\| waitfor_statement
1183	\| waituntil_statement
1184	\| corun_statement
1185	\| cofor_statement
1186	\| exception_statement
1187	\| enable_disable_statement
1188	{ SemanticError( yylloc, "enable/disable statement is currently unimplemented." ); $$ = nullptr; }
1189	\| asm_statement
1190	\| DIRECTIVE
1191	{ $$ = new StatementNode( build_directive( yylloc, $1 ) ); }
1192	;
1193
1194	labeled_statement:
1195	// labels cannot be identifiers 0 or 1
1196	identifier_or_type_name ':' attribute_list_opt statement
1197	{ $$ = $4->add_label( yylloc, $1, $3 ); }
1198	\| identifier_or_type_name ':' attribute_list_opt error // invalid syntax rule
1199	{
1200	SemanticError( yylloc, "syntx error, label \"%s\" must be associated with a statement, "
1201	"where a declaration, case, or default is not a statement.\n"
1202	"Move the label or terminate with a semicolon.", $1.str->c_str() );
1203	$$ = nullptr;
1204	}
1205	;
1206
1207	compound_statement:
1208	'{' '}'
1209	{ $$ = new StatementNode( build_compound( yylloc, (StatementNode *)0 ) ); }
1210	\| '{' push
1211	local_label_declaration_opt // GCC, local labels appear at start of block
1212	statement_decl_list // C99, intermix declarations and statements
1213	pop '}'
1214	{ $$ = new StatementNode( build_compound( yylloc, $4 ) ); }
1215	;
1216
1217	statement_decl_list: // C99
1218	statement_decl
1219	\| statement_decl_list statement_decl
1220	{ assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1221	;
1222
1223	statement_decl:
1224	declaration // CFA, new & old style declarations
1225	{ $$ = new StatementNode( $1 ); }
1226	\| EXTENSION declaration // GCC
1227	{ distExt( $2 ); $$ = new StatementNode( $2 ); }
1228	\| function_definition
1229	{ $$ = new StatementNode( $1 ); }
1230	\| EXTENSION function_definition // GCC
1231	{ distExt( $2 ); $$ = new StatementNode( $2 ); }
1232	\| statement
1233	;
1234
1235	statement_list_nodecl:
1236	statement
1237	\| statement_list_nodecl statement
1238	{ assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1239	\| statement_list_nodecl error // invalid syntax rule
1240	{ SemanticError( yylloc, "syntax error, declarations only allowed at the start of the switch body, i.e., after the '{'." ); $$ = nullptr; }
1241	;
1242
1243	expression_statement:
1244	comma_expression_opt ';'
1245	{ $$ = new StatementNode( build_expr( yylloc, $1 ) ); }
1246	;
1247
1248	// if, switch, and choose require parenthesis around the conditional because it can be followed by a statement.
1249	// For example, without parenthesis:
1250	//
1251	// if x + y + z; => "if ( x + y ) + z" or "if ( x ) + y + z"
1252	// switch ( S ) { ... } => switch ( S ) { compound literal... } ... or
1253
1254	selection_statement:
1255	IF '(' conditional_declaration ')' statement %prec THEN
1256	// explicitly deal with the shift/reduce conflict on if/else
1257	{ $$ = new StatementNode( build_if( yylloc, $3, maybe_build_compound( yylloc, $5 ), nullptr ) ); }
1258	\| IF '(' conditional_declaration ')' statement ELSE statement
1259	{ $$ = new StatementNode( build_if( yylloc, $3, maybe_build_compound( yylloc, $5 ), maybe_build_compound( yylloc, $7 ) ) ); }
1260	\| SWITCH '(' comma_expression ')' case_clause
1261	{ $$ = new StatementNode( build_switch( yylloc, true, $3, $5 ) ); }
1262	\| SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1263	{
1264	StatementNode *sw = new StatementNode( build_switch( yylloc, true, $3, $8 ) );
1265	// The semantics of the declaration list is changed to include associated initialization, which is performed
1266	// before the transfer to the appropriate case clause by hoisting the declarations into a compound
1267	// statement around the switch. Statements after the initial declaration list can never be executed, and
1268	// therefore, are removed from the grammar even though C allows it. The change also applies to choose
1269	// statement.
1270	$$ = $7 ? new StatementNode( build_compound( yylloc, (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1271	}
1272	\| SWITCH '(' comma_expression ')' '{' error '}' // CFA, invalid syntax rule error
1273	{ SemanticError( yylloc, "synatx error, declarations can only appear before the list of case clauses." ); $$ = nullptr; }
1274	\| CHOOSE '(' comma_expression ')' case_clause // CFA
1275	{ $$ = new StatementNode( build_switch( yylloc, false, $3, $5 ) ); }
1276	\| CHOOSE '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1277	{
1278	StatementNode *sw = new StatementNode( build_switch( yylloc, false, $3, $8 ) );
1279	$$ = $7 ? new StatementNode( build_compound( yylloc, (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1280	}
1281	\| CHOOSE '(' comma_expression ')' '{' error '}' // CFA, invalid syntax rule
1282	{ SemanticError( yylloc, "syntax error, declarations can only appear before the list of case clauses." ); $$ = nullptr; }
1283	;
1284
1285	conditional_declaration:
1286	comma_expression
1287	{ $$ = new CondCtl( nullptr, $1 ); }
1288	\| c_declaration // no semi-colon
1289	{ $$ = new CondCtl( $1, nullptr ); }
1290	\| cfa_declaration // no semi-colon
1291	{ $$ = new CondCtl( $1, nullptr ); }
1292	\| declaration comma_expression // semi-colon separated
1293	{ $$ = new CondCtl( $1, $2 ); }
1294	;
1295
1296	// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
1297	// clause allows a list of values and subranges.
1298
1299	case_value: // CFA
1300	constant_expression { $$ = $1; }
1301	\| constant_expression ELLIPSIS constant_expression // GCC, subrange
1302	{ $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1303	\| subrange // CFA, subrange
1304	;
1305
1306	case_value_list: // CFA
1307	case_value { $$ = new ClauseNode( build_case( yylloc, $1 ) ); }
1308	// convert case list, e.g., "case 1, 3, 5:" into "case 1: case 3: case 5"
1309	\| case_value_list ',' case_value { $$ = $1->set_last( new ClauseNode( build_case( yylloc, $3 ) ) ); }
1310	;
1311
1312	case_label: // CFA
1313	CASE error // invalid syntax rule
1314	{ SemanticError( yylloc, "syntax error, case list missing after case." ); $$ = nullptr; }
1315	\| CASE case_value_list ':' { $$ = $2; }
1316	\| CASE case_value_list error // invalid syntax rule
1317	{ SemanticError( yylloc, "syntax error, colon missing after case list." ); $$ = nullptr; }
1318	\| DEFAULT ':' { $$ = new ClauseNode( build_default( yylloc ) ); }
1319	// A semantic check is required to ensure only one default clause per switch/choose statement.
1320	\| DEFAULT error // invalid syntax rule
1321	{ SemanticError( yylloc, "syntax error, colon missing after default." ); $$ = nullptr; }
1322	;
1323
1324	case_label_list: // CFA
1325	case_label
1326	\| case_label_list case_label { $$ = $1->set_last( $2 ); }
1327	;
1328
1329	case_clause: // CFA
1330	case_label_list statement { $$ = $1->append_last_case( maybe_build_compound( yylloc, $2 ) ); }
1331	;
1332
1333	switch_clause_list_opt: // CFA
1334	// empty
1335	{ $$ = nullptr; }
1336	\| switch_clause_list
1337	;
1338
1339	switch_clause_list: // CFA
1340	case_label_list statement_list_nodecl
1341	{ $$ = $1->append_last_case( new StatementNode( build_compound( yylloc, $2 ) ) ); }
1342	\| switch_clause_list case_label_list statement_list_nodecl
1343	{ $$ = $1->set_last( $2->append_last_case( new StatementNode( build_compound( yylloc, $3 ) ) ) ); }
1344	;
1345
1346	iteration_statement:
1347	WHILE '(' ')' statement %prec THEN // CFA => while ( 1 )
1348	{ $$ = new StatementNode( build_while( yylloc, new CondCtl( nullptr, NEW_ONE ), maybe_build_compound( yylloc, $4 ) ) ); }
1349	\| WHILE '(' ')' statement ELSE statement // CFA
1350	{
1351	$$ = new StatementNode( build_while( yylloc, new CondCtl( nullptr, NEW_ONE ), maybe_build_compound( yylloc, $4 ) ) );
1352	SemanticWarning( yylloc, Warning::SuperfluousElse );
1353	}
1354	\| WHILE '(' conditional_declaration ')' statement %prec THEN
1355	{ $$ = new StatementNode( build_while( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1356	\| WHILE '(' conditional_declaration ')' statement ELSE statement // CFA
1357	{ $$ = new StatementNode( build_while( yylloc, $3, maybe_build_compound( yylloc, $5 ), $7 ) ); }
1358	\| DO statement WHILE '(' ')' ';' // CFA => do while( 1 )
1359	{ $$ = new StatementNode( build_do_while( yylloc, NEW_ONE, maybe_build_compound( yylloc, $2 ) ) ); }
1360	\| DO statement WHILE '(' ')' ELSE statement // CFA
1361	{
1362	$$ = new StatementNode( build_do_while( yylloc, NEW_ONE, maybe_build_compound( yylloc, $2 ) ) );
1363	SemanticWarning( yylloc, Warning::SuperfluousElse );
1364	}
1365	\| DO statement WHILE '(' comma_expression ')' ';'
1366	{ $$ = new StatementNode( build_do_while( yylloc, $5, maybe_build_compound( yylloc, $2 ) ) ); }
1367	\| DO statement WHILE '(' comma_expression ')' ELSE statement // CFA
1368	{ $$ = new StatementNode( build_do_while( yylloc, $5, maybe_build_compound( yylloc, $2 ), $8 ) ); }
1369	\| FOR '(' ')' statement %prec THEN // CFA => for ( ;; )
1370	{ $$ = new StatementNode( build_for( yylloc, new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( yylloc, $4 ) ) ); }
1371	\| FOR '(' ')' statement ELSE statement // CFA
1372	{
1373	$$ = new StatementNode( build_for( yylloc, new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( yylloc, $4 ) ) );
1374	SemanticWarning( yylloc, Warning::SuperfluousElse );
1375	}
1376	\| FOR '(' for_control_expression_list ')' statement %prec THEN
1377	{ $$ = new StatementNode( build_for( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1378	\| FOR '(' for_control_expression_list ')' statement ELSE statement // CFA
1379	{ $$ = new StatementNode( build_for( yylloc, $3, maybe_build_compound( yylloc, $5 ), $7 ) ); }
1380	;
1381
1382	for_control_expression_list:
1383	for_control_expression
1384	\| for_control_expression_list ':' for_control_expression
1385	// ForCtrl + ForCtrl:
1386	// init + init => multiple declaration statements that are hoisted
1387	// condition + condition => (expression) && (expression)
1388	// change + change => (expression), (expression)
1389	{
1390	$1->init->set_last( $3->init );
1391	if ( $1->condition ) {
1392	if ( $3->condition ) {
1393	$1->condition->expr.reset( new ast::LogicalExpr( yylloc, $1->condition->expr.release(), $3->condition->expr.release(), ast::AndExpr ) );
1394	} // if
1395	} else $1->condition = $3->condition;
1396	if ( $1->change ) {
1397	if ( $3->change ) {
1398	$1->change->expr.reset( new ast::CommaExpr( yylloc, $1->change->expr.release(), $3->change->expr.release() ) );
1399	} // if
1400	} else $1->change = $3->change;
1401	$$ = $1;
1402	}
1403	;
1404
1405	for_control_expression:
1406	';' comma_expression_opt ';' comma_expression_opt
1407	{ $$ = new ForCtrl( nullptr, $2, $4 ); }
1408	\| comma_expression ';' comma_expression_opt ';' comma_expression_opt
1409	{
1410	StatementNode * init = $1 ? new StatementNode( new ast::ExprStmt( yylloc, maybeMoveBuild( $1 ) ) ) : nullptr;
1411	$$ = new ForCtrl( init, $3, $5 );
1412	}
1413	\| declaration comma_expression_opt ';' comma_expression_opt // C99, declaration has ';'
1414	{ $$ = new ForCtrl( new StatementNode( $1 ), $2, $4 ); }
1415
1416	\| '@' ';' comma_expression // CFA, empty loop-index
1417	{ $$ = new ForCtrl( nullptr, $3, nullptr ); }
1418	\| '@' ';' comma_expression ';' comma_expression // CFA, empty loop-index
1419	{ $$ = new ForCtrl( nullptr, $3, $5 ); }
1420
1421	\| comma_expression // CFA, anonymous loop-index
1422	{ $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), NEW_ZERO, OperKinds::LThan, $1->clone(), NEW_ONE ); }
1423	\| downupdowneq comma_expression // CFA, anonymous loop-index
1424	{ $$ = forCtrl( yylloc, $2, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $1, NEW_ZERO, $2->clone() ), $1, UPDOWN( $1, $2->clone(), NEW_ZERO ), NEW_ONE ); }
1425
1426	\| comma_expression updowneq comma_expression // CFA, anonymous loop-index
1427	{ $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $2, $1->clone(), $3 ), $2, UPDOWN( $2, $3->clone(), $1->clone() ), NEW_ONE ); }
1428	\| '@' updowneq comma_expression // CFA, anonymous loop-index
1429	{
1430	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1431	else $$ = forCtrl( yylloc, $3, new string( DeclarationNode::anonymous.newName() ), $3->clone(), $2, nullptr, NEW_ONE );
1432	}
1433	\| comma_expression updowneq '@' // CFA, anonymous loop-index
1434	{
1435	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1436	else { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1437	}
1438	\| comma_expression updowneq comma_expression '~' comma_expression // CFA, anonymous loop-index
1439	{ $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $2, $1->clone(), $3 ), $2, UPDOWN( $2, $3->clone(), $1->clone() ), $5 ); }
1440	\| '@' updowneq comma_expression '~' comma_expression // CFA, anonymous loop-index
1441	{
1442	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1443	else $$ = forCtrl( yylloc, $3, new string( DeclarationNode::anonymous.newName() ), $3->clone(), $2, nullptr, $5 );
1444	}
1445	\| comma_expression updowneq '@' '~' comma_expression // CFA, anonymous loop-index
1446	{
1447	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1448	else { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1449	}
1450	\| comma_expression updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1451	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1452	\| '@' updowneq '@' // CFA, invalid syntax rule
1453	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1454	\| '@' updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1455	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1456	\| comma_expression updowneq '@' '~' '@' // CFA, invalid syntax rule
1457	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1458	\| '@' updowneq '@' '~' '@' // CFA, invalid syntax rule
1459	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1460
1461	\| comma_expression ';' comma_expression // CFA
1462	{ $$ = forCtrl( yylloc, $3, $1, NEW_ZERO, OperKinds::LThan, $3->clone(), NEW_ONE ); }
1463	\| comma_expression ';' downupdowneq comma_expression // CFA
1464	{ $$ = forCtrl( yylloc, $4, $1, UPDOWN( $3, NEW_ZERO, $4->clone() ), $3, UPDOWN( $3, $4->clone(), NEW_ZERO ), NEW_ONE ); }
1465
1466	\| comma_expression ';' comma_expression updowneq comma_expression // CFA
1467	{ $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), NEW_ONE ); }
1468	\| comma_expression ';' '@' updowneq comma_expression // CFA
1469	{
1470	if ( $4 == OperKinds::LThan \|\| $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1471	else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, NEW_ONE );
1472	}
1473	\| comma_expression ';' comma_expression updowneq '@' // CFA
1474	{
1475	if ( $4 == OperKinds::GThan \|\| $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1476	else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1477	else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, NEW_ONE );
1478	}
1479	\| comma_expression ';' '@' updowneq '@' // CFA, invalid syntax rule
1480	{ SemanticError( yylloc, "syntax error, missing low/high value for up/down-to range so index is uninitialized." ); $$ = nullptr; }
1481
1482	\| comma_expression ';' comma_expression updowneq comma_expression '~' comma_expression // CFA
1483	{ $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), $7 ); }
1484	\| comma_expression ';' '@' updowneq comma_expression '~' comma_expression // CFA, invalid syntax rule
1485	{
1486	if ( $4 == OperKinds::LThan \|\| $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1487	else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, $7 );
1488	}
1489	\| comma_expression ';' comma_expression updowneq '@' '~' comma_expression // CFA
1490	{
1491	if ( $4 == OperKinds::GThan \|\| $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1492	else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1493	else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, $7 );
1494	}
1495	\| comma_expression ';' comma_expression updowneq comma_expression '~' '@' // CFA
1496	{ $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), nullptr ); }
1497	\| comma_expression ';' '@' updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1498	{
1499	if ( $4 == OperKinds::LThan \|\| $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1500	else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, nullptr );
1501	}
1502	\| comma_expression ';' comma_expression updowneq '@' '~' '@' // CFA
1503	{
1504	if ( $4 == OperKinds::GThan \|\| $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1505	else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1506	else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, nullptr );
1507	}
1508	\| comma_expression ';' '@' updowneq '@' '~' '@' // CFA
1509	{ SemanticError( yylloc, "syntax error, missing low/high value for up/down-to range so index is uninitialized." ); $$ = nullptr; }
1510
1511	\| declaration comma_expression // CFA
1512	{ $$ = forCtrl( yylloc, $1, NEW_ZERO, OperKinds::LThan, $2, NEW_ONE ); }
1513	\| declaration downupdowneq comma_expression // CFA
1514	{ $$ = forCtrl( yylloc, $1, UPDOWN( $2, NEW_ZERO, $3 ), $2, UPDOWN( $2, $3->clone(), NEW_ZERO ), NEW_ONE ); }
1515
1516	\| declaration comma_expression updowneq comma_expression // CFA
1517	{ $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2->clone(), $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), NEW_ONE ); }
1518	\| declaration '@' updowneq comma_expression // CFA
1519	{
1520	if ( $3 == OperKinds::LThan \|\| $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1521	else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, NEW_ONE );
1522	}
1523	\| declaration comma_expression updowneq '@' // CFA
1524	{
1525	if ( $3 == OperKinds::GThan \|\| $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1526	else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1527	else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, NEW_ONE );
1528	}
1529
1530	\| declaration comma_expression updowneq comma_expression '~' comma_expression // CFA
1531	{ $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2, $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), $6 ); }
1532	\| declaration '@' updowneq comma_expression '~' comma_expression // CFA
1533	{
1534	if ( $3 == OperKinds::LThan \|\| $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1535	else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, $6 );
1536	}
1537	\| declaration comma_expression updowneq '@' '~' comma_expression // CFA
1538	{
1539	if ( $3 == OperKinds::GThan \|\| $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1540	else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1541	else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, $6 );
1542	}
1543	\| declaration comma_expression updowneq comma_expression '~' '@' // CFA
1544	{ $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2, $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), nullptr ); }
1545	\| declaration '@' updowneq comma_expression '~' '@' // CFA
1546	{
1547	if ( $3 == OperKinds::LThan \|\| $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1548	else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, nullptr );
1549	}
1550	\| declaration comma_expression updowneq '@' '~' '@' // CFA
1551	{
1552	if ( $3 == OperKinds::GThan \|\| $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1553	else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1554	else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, nullptr );
1555	}
1556	\| declaration '@' updowneq '@' '~' '@' // CFA, invalid syntax rule
1557	{ SemanticError( yylloc, "syntax error, missing low/high value for up/down-to range so index is uninitialized." ); $$ = nullptr; }
1558
1559	\| comma_expression ';' TYPEDEFname // CFA, array type
1560	{
1561	SemanticError( yylloc, "Type iterator is currently unimplemented." ); $$ = nullptr;
1562	//$$ = forCtrl( new ExpressionNode( build_varref( $3 ) ), $1, nullptr, OperKinds::Range, nullptr, nullptr );
1563	}
1564	\| comma_expression ';' downupdowneq TYPEDEFname // CFA, array type
1565	{
1566	if ( $3 == OperKinds::LEThan \|\| $3 == OperKinds::GEThan ) {
1567	SemanticError( yylloc, "syntax error, all enumeration ranges are equal (all values). Remove \"=~\"." ); $$ = nullptr;
1568	}
1569	SemanticError( yylloc, "Type iterator is currently unimplemented." ); $$ = nullptr;
1570	}
1571	;
1572
1573	downupdowneq:
1574	ErangeDown
1575	{ $$ = OperKinds::GThan; }
1576	\| ErangeUpEq
1577	{ $$ = OperKinds::LEThan; }
1578	\| ErangeDownEq
1579	{ $$ = OperKinds::GEThan; }
1580	;
1581
1582	updown:
1583	'~'
1584	{ $$ = OperKinds::LThan; }
1585	\| ErangeDown
1586	{ $$ = OperKinds::GThan; }
1587	;
1588
1589	updowneq:
1590	updown
1591	\| ErangeUpEq
1592	{ $$ = OperKinds::LEThan; }
1593	\| ErangeDownEq
1594	{ $$ = OperKinds::GEThan; }
1595	;
1596
1597	jump_statement:
1598	GOTO identifier_or_type_name ';'
1599	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Goto ) ); }
1600	\| GOTO '*' comma_expression ';' // GCC, computed goto
1601	// The syntax for the GCC computed goto violates normal expression precedence, e.g., goto i+3; => goto (i+3);
1602	// whereas normal operator precedence yields goto (*i)+3;
1603	{ $$ = new StatementNode( build_computedgoto( $3 ) ); }
1604	// A semantic check is required to ensure fallthru appears only in the body of a choose statement.
1605	\| fall_through_name ';' // CFA
1606	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::FallThrough ) ); }
1607	\| fall_through_name identifier_or_type_name ';' // CFA
1608	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::FallThrough ) ); }
1609	\| fall_through_name DEFAULT ';' // CFA
1610	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::FallThroughDefault ) ); }
1611	\| CONTINUE ';'
1612	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1613	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::Continue ) ); }
1614	\| CONTINUE identifier_or_type_name ';' // CFA, multi-level continue
1615	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1616	// the target of the transfer appears only at the start of an iteration statement.
1617	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Continue ) ); }
1618	\| BREAK ';'
1619	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1620	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::Break ) ); }
1621	\| BREAK identifier_or_type_name ';' // CFA, multi-level exit
1622	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1623	// the target of the transfer appears only at the start of an iteration statement.
1624	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Break ) ); }
1625	\| RETURN comma_expression_opt ';'
1626	{ $$ = new StatementNode( build_return( yylloc, $2 ) ); }
1627	\| RETURN '{' initializer_list_opt comma_opt '}' ';'
1628	{ SemanticError( yylloc, "Initializer return is currently unimplemented." ); $$ = nullptr; }
1629	\| SUSPEND ';'
1630	{ $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::None ) ); }
1631	\| SUSPEND compound_statement
1632	{ $$ = new StatementNode( build_suspend( yylloc, $2, ast::SuspendStmt::None ) ); }
1633	\| SUSPEND COROUTINE ';'
1634	{ $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::Coroutine ) ); }
1635	\| SUSPEND COROUTINE compound_statement
1636	{ $$ = new StatementNode( build_suspend( yylloc, $3, ast::SuspendStmt::Coroutine ) ); }
1637	\| SUSPEND GENERATOR ';'
1638	{ $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::Generator ) ); }
1639	\| SUSPEND GENERATOR compound_statement
1640	{ $$ = new StatementNode( build_suspend( yylloc, $3, ast::SuspendStmt::Generator ) ); }
1641	\| THROW assignment_expression_opt ';' // handles rethrow
1642	{ $$ = new StatementNode( build_throw( yylloc, $2 ) ); }
1643	\| THROWRESUME assignment_expression_opt ';' // handles reresume
1644	{ $$ = new StatementNode( build_resume( yylloc, $2 ) ); }
1645	\| THROWRESUME assignment_expression_opt AT assignment_expression ';' // handles reresume
1646	{ $$ = new StatementNode( build_resume_at( $2, $4 ) ); }
1647	;
1648
1649	fall_through_name: // CFA
1650	FALLTHRU
1651	\| FALLTHROUGH
1652	;
1653
1654	with_statement:
1655	WITH '(' tuple_expression_list ')' statement
1656	{ $$ = new StatementNode( build_with( yylloc, $3, $5 ) ); }
1657	;
1658
1659	// If MUTEX becomes a general qualifier, there are shift/reduce conflicts, so possibly change syntax to "with mutex".
1660	mutex_statement:
1661	MUTEX '(' argument_expression_list_opt ')' statement
1662	{
1663	if ( ! $3 ) { SemanticError( yylloc, "syntax error, mutex argument list cannot be empty." ); $$ = nullptr; }
1664	$$ = new StatementNode( build_mutex( yylloc, $3, $5 ) );
1665	}
1666	;
1667
1668	when_clause:
1669	WHEN '(' comma_expression ')' { $$ = $3; }
1670	;
1671
1672	when_clause_opt:
1673	// empty
1674	{ $$ = nullptr; }
1675	\| when_clause
1676	;
1677
1678	cast_expression_list:
1679	cast_expression
1680	\| cast_expression_list ',' cast_expression
1681	// { $$ = (ExpressionNode *)($1->set_last( $3 )); }
1682	{ SemanticError( yylloc, "List of mutex member is currently unimplemented." ); $$ = nullptr; }
1683	;
1684
1685	timeout:
1686	TIMEOUT '(' comma_expression ')' { $$ = $3; }
1687	;
1688
1689	wor:
1690	OROR
1691	\| WOR
1692
1693	waitfor:
1694	WAITFOR '(' cast_expression ')'
1695	{ $$ = $3; }
1696	\| WAITFOR '(' cast_expression_list ':' argument_expression_list_opt ')'
1697	{ $$ = (ExpressionNode *)($3->set_last( $5 )); }
1698	;
1699
1700	wor_waitfor_clause:
1701	when_clause_opt waitfor statement %prec THEN
1702	// Called first: create header for WaitForStmt.
1703	{ $$ = build_waitfor( yylloc, new ast::WaitForStmt( yylloc ), $1, $2, maybe_build_compound( yylloc, $3 ) ); }
1704	\| wor_waitfor_clause wor when_clause_opt waitfor statement
1705	{ $$ = build_waitfor( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ); }
1706	\| wor_waitfor_clause wor when_clause_opt ELSE statement
1707	{ $$ = build_waitfor_else( yylloc, $1, $3, maybe_build_compound( yylloc, $5 ) ); }
1708	\| wor_waitfor_clause wor when_clause_opt timeout statement %prec THEN
1709	{ $$ = build_waitfor_timeout( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ); }
1710	// "else" must be conditional after timeout or timeout is never triggered (i.e., it is meaningless)
1711	\| wor_waitfor_clause wor when_clause_opt timeout statement wor ELSE statement // invalid syntax rule
1712	{ SemanticError( yylloc, "syntax error, else clause must be conditional after timeout or timeout never triggered." ); $$ = nullptr; }
1713	\| wor_waitfor_clause wor when_clause_opt timeout statement wor when_clause ELSE statement
1714	{ $$ = build_waitfor_else( yylloc, build_waitfor_timeout( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ), $7, maybe_build_compound( yylloc, $9 ) ); }
1715	;
1716
1717	waitfor_statement:
1718	wor_waitfor_clause %prec THEN
1719	{ $$ = new StatementNode( $1 ); }
1720	;
1721
1722	wand:
1723	ANDAND
1724	\| WAND
1725	;
1726
1727	waituntil:
1728	WAITUNTIL '(' comma_expression ')'
1729	{ $$ = $3; }
1730	;
1731
1732	waituntil_clause:
1733	when_clause_opt waituntil statement
1734	{ $$ = build_waituntil_clause( yylloc, $1, $2, maybe_build_compound( yylloc, $3 ) ); }
1735	\| '(' wor_waituntil_clause ')'
1736	{ $$ = $2; }
1737	;
1738
1739	wand_waituntil_clause:
1740	waituntil_clause %prec THEN
1741	{ $$ = $1; }
1742	\| waituntil_clause wand wand_waituntil_clause
1743	{ $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::AND, $1, $3 ); }
1744	;
1745
1746	wor_waituntil_clause:
1747	wand_waituntil_clause
1748	{ $$ = $1; }
1749	\| wor_waituntil_clause wor wand_waituntil_clause
1750	{ $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::OR, $1, $3 ); }
1751	\| wor_waituntil_clause wor when_clause_opt ELSE statement
1752	{ $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::LEFT_OR, $1, build_waituntil_else( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1753	;
1754
1755	waituntil_statement:
1756	wor_waituntil_clause %prec THEN
1757	{ $$ = new StatementNode( build_waituntil_stmt( yylloc, $1 ) ); }
1758	;
1759
1760	corun_statement:
1761	CORUN statement
1762	{ $$ = new StatementNode( build_corun( yylloc, $2 ) ); }
1763	;
1764
1765	cofor_statement:
1766	COFOR '(' for_control_expression_list ')' statement
1767	{ $$ = new StatementNode( build_cofor( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1768	;
1769
1770	exception_statement:
1771	TRY compound_statement handler_clause %prec THEN
1772	{ $$ = new StatementNode( build_try( yylloc, $2, $3, nullptr ) ); }
1773	\| TRY compound_statement finally_clause
1774	{ $$ = new StatementNode( build_try( yylloc, $2, nullptr, $3 ) ); }
1775	\| TRY compound_statement handler_clause finally_clause
1776	{ $$ = new StatementNode( build_try( yylloc, $2, $3, $4 ) ); }
1777	;
1778
1779	handler_clause:
1780	handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement
1781	{ $$ = new ClauseNode( build_catch( yylloc, $1, $4, $6, $8 ) ); }
1782	\| handler_clause handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement
1783	{ $$ = $1->set_last( new ClauseNode( build_catch( yylloc, $2, $5, $7, $9 ) ) ); }
1784	;
1785
1786	handler_predicate_opt:
1787	// empty
1788	{ $$ = nullptr; }
1789	\| ';' conditional_expression { $$ = $2; }
1790	;
1791
1792	handler_key:
1793	CATCH { $$ = ast::Terminate; }
1794	\| RECOVER { $$ = ast::Terminate; }
1795	\| CATCHRESUME { $$ = ast::Resume; }
1796	\| FIXUP { $$ = ast::Resume; }
1797	;
1798
1799	finally_clause:
1800	FINALLY compound_statement { $$ = new ClauseNode( build_finally( yylloc, $2 ) ); }
1801	;
1802
1803	exception_declaration:
1804	// No SUE declaration in parameter list.
1805	type_specifier_nobody
1806	\| type_specifier_nobody declarator
1807	{ $$ = $2->addType( $1 ); }
1808	\| type_specifier_nobody variable_abstract_declarator
1809	{ $$ = $2->addType( $1 ); }
1810	\| cfa_abstract_declarator_tuple identifier // CFA
1811	{ $$ = $1->addName( $2 ); }
1812	\| cfa_abstract_declarator_tuple // CFA
1813	;
1814
1815	enable_disable_statement:
1816	enable_disable_key identifier_list compound_statement
1817	;
1818
1819	enable_disable_key:
1820	ENABLE
1821	\| DISABLE
1822	;
1823
1824	asm_statement:
1825	ASM asm_volatile_opt '(' string_literal ')' ';'
1826	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, nullptr ) ); }
1827	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ')' ';' // remaining GCC
1828	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, $6 ) ); }
1829	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ')' ';'
1830	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, $6, $8 ) ); }
1831	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
1832	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, $6, $8, $10 ) ); }
1833	\| ASM asm_volatile_opt GOTO '(' string_literal ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
1834	{ $$ = new StatementNode( build_asm( yylloc, $2, $5, nullptr, $8, $10, $12 ) ); }
1835	;
1836
1837	asm_volatile_opt: // GCC
1838	// empty
1839	{ $$ = false; }
1840	\| VOLATILE
1841	{ $$ = true; }
1842	;
1843
1844	asm_operands_opt: // GCC
1845	// empty
1846	{ $$ = nullptr; } // use default argument
1847	\| asm_operands_list
1848	;
1849
1850	asm_operands_list: // GCC
1851	asm_operand
1852	\| asm_operands_list ',' asm_operand
1853	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
1854	;
1855
1856	asm_operand: // GCC
1857	string_literal '(' constant_expression ')'
1858	{ $$ = new ExpressionNode( new ast::AsmExpr( yylloc, "", maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1859	\| '[' IDENTIFIER ']' string_literal '(' constant_expression ')'
1860	{
1861	$$ = new ExpressionNode( new ast::AsmExpr( yylloc, *$2.str, maybeMoveBuild( $4 ), maybeMoveBuild( $6 ) ) );
1862	delete $2.str;
1863	}
1864	;
1865
1866	asm_clobbers_list_opt: // GCC
1867	// empty
1868	{ $$ = nullptr; } // use default argument
1869	\| string_literal
1870	{ $$ = $1; }
1871	\| asm_clobbers_list_opt ',' string_literal
1872	{ $$ = (ExpressionNode *)( $1->set_last( $3 ) ); }
1873	;
1874
1875	label_list:
1876	identifier
1877	{
1878	$$ = new LabelNode(); $$->labels.emplace_back( yylloc, *$1 );
1879	delete $1; // allocated by lexer
1880	}
1881	\| label_list ',' identifier
1882	{
1883	$$ = $1; $1->labels.emplace_back( yylloc, *$3 );
1884	delete $3; // allocated by lexer
1885	}
1886	;
1887
1888	// **************************** DECLARATIONS *******************************
1889
1890	declaration_list_opt: // used at beginning of switch statement
1891	// empty
1892	{ $$ = nullptr; }
1893	\| declaration_list
1894	;
1895
1896	declaration_list:
1897	declaration
1898	\| declaration_list declaration
1899	{ $$ = $1->set_last( $2 ); }
1900	;
1901
1902	KR_parameter_list_opt: // used to declare parameter types in K&R style functions
1903	// empty
1904	{ $$ = nullptr; }
1905	\| KR_parameter_list
1906	;
1907
1908	KR_parameter_list:
1909	c_declaration ';'
1910	{ $$ = $1; }
1911	\| KR_parameter_list c_declaration ';'
1912	{ $$ = $1->set_last( $2 ); }
1913	;
1914
1915	local_label_declaration_opt: // GCC, local label
1916	// empty
1917	\| local_label_declaration_list
1918	;
1919
1920	local_label_declaration_list: // GCC, local label
1921	LABEL local_label_list ';'
1922	\| local_label_declaration_list LABEL local_label_list ';'
1923	;
1924
1925	local_label_list: // GCC, local label
1926	identifier_or_type_name
1927	\| local_label_list ',' identifier_or_type_name
1928	;
1929
1930	declaration: // old & new style declarations
1931	c_declaration ';'
1932	\| cfa_declaration ';' // CFA
1933	\| static_assert // C11
1934	;
1935
1936	static_assert:
1937	STATICASSERT '(' constant_expression ',' string_literal ')' ';' // C11
1938	{ $$ = DeclarationNode::newStaticAssert( $3, maybeMoveBuild( $5 ) ); }
1939	\| STATICASSERT '(' constant_expression ')' ';' // CFA
1940	{ $$ = DeclarationNode::newStaticAssert( $3, build_constantStr( yylloc, *new string( "\"\"" ) ) ); }
1941
1942	// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
1943	// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
1944	// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
1945	// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
1946	// the declaration list (as in Pascal). ANSI C and the new CFA declarations may appear together in the same program
1947	// block, but cannot be mixed within a specific declaration.
1948	//
1949	// CFA C
1950	// [10] int x; int x[10]; // array of 10 integers
1951	// [10] * char y; char *y[10]; // array of 10 pointers to char
1952
1953	cfa_declaration: // CFA
1954	cfa_variable_declaration
1955	\| cfa_typedef_declaration
1956	\| cfa_function_declaration
1957	\| type_declaring_list
1958	{ SemanticError( yylloc, "otype declaration is currently unimplemented." ); $$ = nullptr; }
1959	\| trait_specifier
1960	;
1961
1962	cfa_variable_declaration: // CFA
1963	cfa_variable_specifier initializer_opt
1964	{ $$ = $1->addInitializer( $2 ); }
1965	\| declaration_qualifier_list cfa_variable_specifier initializer_opt
1966	// declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
1967	// them as a type_qualifier cannot appear in that context.
1968	{ $$ = $2->addQualifiers( $1 )->addInitializer( $3 ); }
1969	\| cfa_variable_declaration pop ',' push identifier_or_type_name initializer_opt
1970	{ $$ = $1->set_last( $1->cloneType( $5 )->addInitializer( $6 ) ); }
1971	;
1972
1973	cfa_variable_specifier: // CFA
1974	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
1975	// storage-class
1976	cfa_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
1977	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
1978	\| cfa_abstract_tuple identifier_or_type_name asm_name_opt
1979	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
1980	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name asm_name_opt
1981	{ $$ = $2->addQualifiers( $1 )->addName( $3 )->addAsmName( $4 ); }
1982	;
1983
1984	cfa_function_declaration: // CFA
1985	cfa_function_specifier
1986	\| type_qualifier_list cfa_function_specifier
1987	{ $$ = $2->addQualifiers( $1 ); }
1988	\| declaration_qualifier_list cfa_function_specifier
1989	{ $$ = $2->addQualifiers( $1 ); }
1990	\| declaration_qualifier_list type_qualifier_list cfa_function_specifier
1991	{ $$ = $3->addQualifiers( $1 )->addQualifiers( $2 ); }
1992	\| cfa_function_declaration ',' identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')'
1993	{
1994	// Append the return type at the start (left-hand-side) to each identifier in the list.
1995	DeclarationNode * ret = new DeclarationNode;
1996	ret->type = maybeCopy( $1->type->base );
1997	$$ = $1->set_last( DeclarationNode::newFunction( $3, ret, $6, nullptr ) );
1998	}
1999	;
2000
2001	cfa_function_specifier: // CFA
2002	'[' ']' identifier '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2003	{ $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2004	\| '[' ']' TYPEDEFname '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2005	{ $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2006	// \| '[' ']' TYPEGENname '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2007	// { $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2008
2009	// identifier_or_type_name must be broken apart because of the sequence:
2010	//
2011	// '[' ']' identifier_or_type_name '(' cfa_parameter_list_ellipsis_opt ')'
2012	// '[' ']' type_specifier
2013	//
2014	// type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
2015	// flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
2016	\| cfa_abstract_tuple identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2017	// To obtain LR(1 ), this rule must be factored out from function return type (see cfa_abstract_declarator).
2018	{ $$ = DeclarationNode::newFunction( $2, $1, $5, nullptr )->addQualifiers( $8 ); }
2019	\| cfa_function_return identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2020	{ $$ = DeclarationNode::newFunction( $2, $1, $5, nullptr )->addQualifiers( $8 ); }
2021	;
2022
2023	cfa_function_return: // CFA
2024	'[' push cfa_parameter_list pop ']'
2025	{ $$ = DeclarationNode::newTuple( $3 ); }
2026	\| '[' push cfa_parameter_list ',' cfa_abstract_parameter_list pop ']'
2027	// To obtain LR(1 ), the last cfa_abstract_parameter_list is added into this flattened rule to lookahead to the ']'.
2028	{ $$ = DeclarationNode::newTuple( $3->set_last( $5 ) ); }
2029	;
2030
2031	cfa_typedef_declaration: // CFA
2032	TYPEDEF cfa_variable_specifier
2033	{
2034	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "cfa_typedef_declaration 1" );
2035	$$ = $2->addTypedef();
2036	}
2037	\| TYPEDEF cfa_function_specifier
2038	{
2039	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "cfa_typedef_declaration 2" );
2040	$$ = $2->addTypedef();
2041	}
2042	\| cfa_typedef_declaration ',' identifier
2043	{
2044	typedefTable.addToEnclosingScope( *$3, TYPEDEFname, "cfa_typedef_declaration 3" );
2045	$$ = $1->set_last( $1->cloneType( $3 ) );
2046	}
2047	;
2048
2049	// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
2050	// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.
2051
2052	typedef_declaration:
2053	TYPEDEF type_specifier declarator
2054	{
2055	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "typedef_declaration 1" );
2056	if ( $2->type->forall \|\| ($2->type->kind == TypeData::Aggregate && $2->type->aggregate.params) ) {
2057	SemanticError( yylloc, "forall qualifier in typedef is currently unimplemented." ); $$ = nullptr;
2058	} else $$ = $3->addType( $2 )->addTypedef(); // watchout frees $2 and $3
2059	}
2060	\| typedef_declaration ',' declarator
2061	{
2062	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "typedef_declaration 2" );
2063	$$ = $1->set_last( $1->cloneBaseType( $3 )->addTypedef() );
2064	}
2065	\| type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
2066	{ SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2067	\| type_specifier TYPEDEF declarator
2068	{ SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2069	\| type_specifier TYPEDEF type_qualifier_list declarator
2070	{ SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2071	;
2072
2073	typedef_expression:
2074	// deprecated GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
2075	TYPEDEF identifier '=' assignment_expression
2076	{
2077	SemanticError( yylloc, "TYPEDEF expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
2078	}
2079	\| typedef_expression ',' identifier '=' assignment_expression
2080	{
2081	SemanticError( yylloc, "TYPEDEF expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
2082	}
2083	;
2084
2085	c_declaration:
2086	declaration_specifier declaring_list
2087	{ $$ = distAttr( $1, $2 ); }
2088	\| typedef_declaration
2089	\| typedef_expression // deprecated GCC, naming expression type
2090	\| sue_declaration_specifier
2091	{
2092	assert( $1->type );
2093	if ( $1->type->qualifiers.any() ) { // CV qualifiers ?
2094	SemanticError( yylloc, "syntax error, useless type qualifier(s) in empty declaration." ); $$ = nullptr;
2095	}
2096	// enums are never empty declarations because there must have at least one enumeration.
2097	if ( $1->type->kind == TypeData::AggregateInst && $1->storageClasses.any() ) { // storage class ?
2098	SemanticError( yylloc, "syntax error, useless storage qualifier(s) in empty aggregate declaration." ); $$ = nullptr;
2099	}
2100	}
2101	;
2102
2103	declaring_list:
2104	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
2105	// storage-class
2106	variable_declarator asm_name_opt initializer_opt
2107	{ $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
2108	\| variable_type_redeclarator asm_name_opt initializer_opt
2109	{ $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
2110
2111	\| general_function_declarator asm_name_opt
2112	{ $$ = $1->addAsmName( $2 )->addInitializer( nullptr ); }
2113	\| general_function_declarator asm_name_opt '=' VOID
2114	{ $$ = $1->addAsmName( $2 )->addInitializer( new InitializerNode( true ) ); }
2115
2116	\| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
2117	{ $$ = $1->set_last( $4->addQualifiers( $3 )->addAsmName( $5 )->addInitializer( $6 ) ); }
2118	;
2119
2120	general_function_declarator:
2121	function_type_redeclarator
2122	\| function_declarator
2123	;
2124
2125	declaration_specifier: // type specifier + storage class
2126	basic_declaration_specifier
2127	\| type_declaration_specifier
2128	\| sue_declaration_specifier
2129	\| sue_declaration_specifier invalid_types // invalid syntax rule
2130	{
2131	SemanticError( yylloc, "syntax error, expecting ';' at end of \"%s\" declaration.",
2132	$1->type->enumeration.name ? "enum" : ast::AggregateDecl::aggrString( $1->type->aggregate.kind ) );
2133	$$ = nullptr;
2134	}
2135	;
2136
2137	invalid_types:
2138	aggregate_key
2139	\| basic_type_name
2140	\| indirect_type
2141	;
2142
2143	declaration_specifier_nobody: // type specifier + storage class - {...}
2144	// Preclude SUE declarations in restricted scopes:
2145	//
2146	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
2147	//
2148	// because it is impossible to call f due to name equivalence.
2149	basic_declaration_specifier
2150	\| sue_declaration_specifier_nobody
2151	\| type_declaration_specifier
2152	;
2153
2154	type_specifier: // type specifier
2155	basic_type_specifier
2156	\| sue_type_specifier
2157	\| type_type_specifier
2158	;
2159
2160	type_specifier_nobody: // type specifier - {...}
2161	// Preclude SUE declarations in restricted scopes:
2162	//
2163	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
2164	//
2165	// because it is impossible to call f due to name equivalence.
2166	basic_type_specifier
2167	\| sue_type_specifier_nobody
2168	\| type_type_specifier
2169	;
2170
2171	type_qualifier_list_opt: // GCC, used in asm_statement
2172	// empty
2173	{ $$ = nullptr; }
2174	\| type_qualifier_list
2175	;
2176
2177	type_qualifier_list:
2178	// A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
2179	//
2180	// ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
2181	// specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
2182	// appeared only once.
2183	type_qualifier
2184	\| type_qualifier_list type_qualifier
2185	{ $$ = $1->addQualifiers( $2 ); }
2186	;
2187
2188	type_qualifier:
2189	type_qualifier_name
2190	\| attribute // trick handles most attribute locations
2191	;
2192
2193	type_qualifier_name:
2194	CONST
2195	{ $$ = DeclarationNode::newTypeQualifier( ast::CV::Const ); }
2196	\| RESTRICT
2197	{ $$ = DeclarationNode::newTypeQualifier( ast::CV::Restrict ); }
2198	\| VOLATILE
2199	{ $$ = DeclarationNode::newTypeQualifier( ast::CV::Volatile ); }
2200	\| ATOMIC
2201	{ $$ = DeclarationNode::newTypeQualifier( ast::CV::Atomic ); }
2202	\| forall
2203	{ $$ = DeclarationNode::newForall( $1 ); }
2204	;
2205
2206	forall:
2207	FORALL '(' type_parameter_list ')' // CFA
2208	{ $$ = $3; }
2209	;
2210
2211	declaration_qualifier_list:
2212	storage_class_list
2213	\| type_qualifier_list storage_class_list // remaining OBSOLESCENT (see 2 )
2214	{ $$ = $1->addQualifiers( $2 ); }
2215	\| declaration_qualifier_list type_qualifier_list storage_class_list
2216	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2217	;
2218
2219	storage_class_list:
2220	// A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
2221	// only one of each is specified, except for inline, which can appear with the others.
2222	//
2223	// ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
2224	// specifiers in a declaration.
2225	storage_class
2226	\| storage_class_list storage_class
2227	{ $$ = $1->addQualifiers( $2 ); }
2228	;
2229
2230	storage_class:
2231	EXTERN
2232	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Extern ); }
2233	\| STATIC
2234	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Static ); }
2235	\| AUTO
2236	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Auto ); }
2237	\| REGISTER
2238	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Register ); }
2239	\| THREADLOCALGCC // GCC
2240	{ $$ = DeclarationNode::newStorageClass( ast::Storage::ThreadLocalGcc ); }
2241	\| THREADLOCALC11 // C11
2242	{ $$ = DeclarationNode::newStorageClass( ast::Storage::ThreadLocalC11 ); }
2243	// Put function specifiers here to simplify parsing rules, but separate them semantically.
2244	\| INLINE // C99
2245	{ $$ = DeclarationNode::newFuncSpecifier( ast::Function::Inline ); }
2246	\| FORTRAN // C99
2247	{ $$ = DeclarationNode::newFuncSpecifier( ast::Function::Fortran ); }
2248	\| NORETURN // C11
2249	{ $$ = DeclarationNode::newFuncSpecifier( ast::Function::Noreturn ); }
2250	;
2251
2252	basic_type_name:
2253	VOID
2254	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
2255	\| BOOL // C99
2256	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Bool ); }
2257	\| CHAR
2258	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Char ); }
2259	\| INT
2260	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int ); }
2261	\| INT128
2262	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int128 ); }
2263	\| UINT128
2264	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Int128 )->addType( DeclarationNode::newSignedNess( DeclarationNode::Unsigned ) ); }
2265	\| FLOAT
2266	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Float ); }
2267	\| DOUBLE
2268	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Double ); }
2269	\| uuFLOAT80
2270	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uuFloat80 ); }
2271	\| uuFLOAT128
2272	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uuFloat128 ); }
2273	\| uFLOAT16
2274	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat16 ); }
2275	\| uFLOAT32
2276	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat32 ); }
2277	\| uFLOAT32X
2278	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat32x ); }
2279	\| uFLOAT64
2280	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat64 ); }
2281	\| uFLOAT64X
2282	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat64x ); }
2283	\| uFLOAT128
2284	{ $$ = DeclarationNode::newBasicType( DeclarationNode::uFloat128 ); }
2285	\| DECIMAL32
2286	{ SemanticError( yylloc, "_Decimal32 is currently unimplemented." ); $$ = nullptr; }
2287	\| DECIMAL64
2288	{ SemanticError( yylloc, "_Decimal64 is currently unimplemented." ); $$ = nullptr; }
2289	\| DECIMAL128
2290	{ SemanticError( yylloc, "_Decimal128 is currently unimplemented." ); $$ = nullptr; }
2291	\| COMPLEX // C99
2292	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Complex ); }
2293	\| IMAGINARY // C99
2294	{ $$ = DeclarationNode::newComplexType( DeclarationNode::Imaginary ); }
2295	\| SIGNED
2296	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Signed ); }
2297	\| UNSIGNED
2298	{ $$ = DeclarationNode::newSignedNess( DeclarationNode::Unsigned ); }
2299	\| SHORT
2300	{ $$ = DeclarationNode::newLength( DeclarationNode::Short ); }
2301	\| LONG
2302	{ $$ = DeclarationNode::newLength( DeclarationNode::Long ); }
2303	\| VA_LIST // GCC, __builtin_va_list
2304	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Valist ); }
2305	\| AUTO_TYPE
2306	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::AutoType ); }
2307	\| vtable
2308	;
2309
2310	vtable_opt:
2311	// empty
2312	{ $$ = nullptr; }
2313	\| vtable
2314	;
2315
2316	vtable:
2317	VTABLE '(' type_name ')' default_opt
2318	{ $$ = DeclarationNode::newVtableType( $3 ); }
2319	// { SemanticError( yylloc, "vtable is currently unimplemented." ); $$ = nullptr; }
2320	;
2321
2322	default_opt:
2323	// empty
2324	{ $$ = nullptr; }
2325	\| DEFAULT
2326	{ SemanticError( yylloc, "vtable default is currently unimplemented." ); $$ = nullptr; }
2327	;
2328
2329	basic_declaration_specifier:
2330	// A semantic check is necessary for conflicting storage classes.
2331	basic_type_specifier
2332	\| declaration_qualifier_list basic_type_specifier
2333	{ $$ = $2->addQualifiers( $1 ); }
2334	\| basic_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2335	{ $$ = $1->addQualifiers( $2 ); }
2336	\| basic_declaration_specifier storage_class type_qualifier_list
2337	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2338	\| basic_declaration_specifier storage_class basic_type_specifier
2339	{ $$ = $3->addQualifiers( $2 )->addType( $1 ); }
2340	;
2341
2342	basic_type_specifier:
2343	direct_type
2344	// Cannot have type modifiers, e.g., short, long, etc.
2345	\| type_qualifier_list_opt indirect_type type_qualifier_list_opt
2346	{ $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
2347	;
2348
2349	direct_type:
2350	basic_type_name
2351	\| type_qualifier_list basic_type_name
2352	{ $$ = $2->addQualifiers( $1 ); }
2353	\| direct_type type_qualifier
2354	{ $$ = $1->addQualifiers( $2 ); }
2355	\| direct_type basic_type_name
2356	{ $$ = $1->addType( $2 ); }
2357	;
2358
2359	indirect_type:
2360	TYPEOF '(' type ')' // GCC: typeof( x ) y;
2361	{ $$ = $3; }
2362	\| TYPEOF '(' comma_expression ')' // GCC: typeof( a+b ) y;
2363	{ $$ = DeclarationNode::newTypeof( $3 ); }
2364	\| BASETYPEOF '(' type ')' // CFA: basetypeof( x ) y;
2365	{ $$ = DeclarationNode::newTypeof( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ), true ); }
2366	\| BASETYPEOF '(' comma_expression ')' // CFA: basetypeof( a+b ) y;
2367	{ $$ = DeclarationNode::newTypeof( $3, true ); }
2368	\| ZERO_T // CFA
2369	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::Zero ); }
2370	\| ONE_T // CFA
2371	{ $$ = DeclarationNode::newBuiltinType( DeclarationNode::One ); }
2372	;
2373
2374	sue_declaration_specifier: // struct, union, enum + storage class + type specifier
2375	sue_type_specifier
2376	\| declaration_qualifier_list sue_type_specifier
2377	{ $$ = $2->addQualifiers( $1 ); }
2378	\| sue_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2379	{ $$ = $1->addQualifiers( $2 ); }
2380	\| sue_declaration_specifier storage_class type_qualifier_list
2381	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2382	;
2383
2384	sue_type_specifier: // struct, union, enum + type specifier
2385	elaborated_type
2386	\| type_qualifier_list
2387	{ if ( $1->type != nullptr && $1->type->forall ) forall = true; } // remember generic type
2388	elaborated_type
2389	{ $$ = $3->addQualifiers( $1 ); }
2390	\| sue_type_specifier type_qualifier
2391	{
2392	if ( $2->type != nullptr && $2->type->forall ) forall = true; // remember generic type
2393	$$ = $1->addQualifiers( $2 );
2394	}
2395	;
2396
2397	sue_declaration_specifier_nobody: // struct, union, enum - {...} + storage class + type specifier
2398	sue_type_specifier_nobody
2399	\| declaration_qualifier_list sue_type_specifier_nobody
2400	{ $$ = $2->addQualifiers( $1 ); }
2401	\| sue_declaration_specifier_nobody storage_class // remaining OBSOLESCENT (see 2)
2402	{ $$ = $1->addQualifiers( $2 ); }
2403	\| sue_declaration_specifier_nobody storage_class type_qualifier_list
2404	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2405	;
2406
2407	sue_type_specifier_nobody: // struct, union, enum - {...} + type specifier
2408	elaborated_type_nobody
2409	\| type_qualifier_list elaborated_type_nobody
2410	{ $$ = $2->addQualifiers( $1 ); }
2411	\| sue_type_specifier_nobody type_qualifier
2412	{ $$ = $1->addQualifiers( $2 ); }
2413	;
2414
2415	type_declaration_specifier:
2416	type_type_specifier
2417	\| declaration_qualifier_list type_type_specifier
2418	{ $$ = $2->addQualifiers( $1 ); }
2419	\| type_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2420	{ $$ = $1->addQualifiers( $2 ); }
2421	\| type_declaration_specifier storage_class type_qualifier_list
2422	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2423	;
2424
2425	type_type_specifier: // typedef types
2426	type_name
2427	\| type_qualifier_list type_name
2428	{ $$ = $2->addQualifiers( $1 ); }
2429	\| type_type_specifier type_qualifier
2430	{ $$ = $1->addQualifiers( $2 ); }
2431	;
2432
2433	type_name:
2434	TYPEDEFname
2435	{ $$ = DeclarationNode::newFromTypedef( $1 ); }
2436	\| '.' TYPEDEFname
2437	{ $$ = DeclarationNode::newQualifiedType( DeclarationNode::newFromGlobalScope(), DeclarationNode::newFromTypedef( $2 ) ); }
2438	\| type_name '.' TYPEDEFname
2439	{ $$ = DeclarationNode::newQualifiedType( $1, DeclarationNode::newFromTypedef( $3 ) ); }
2440	\| typegen_name
2441	\| '.' typegen_name
2442	{ $$ = DeclarationNode::newQualifiedType( DeclarationNode::newFromGlobalScope(), $2 ); }
2443	\| type_name '.' typegen_name
2444	{ $$ = DeclarationNode::newQualifiedType( $1, $3 ); }
2445	;
2446
2447	typegen_name: // CFA
2448	TYPEGENname
2449	{ $$ = DeclarationNode::newFromTypeGen( $1, nullptr ); }
2450	\| TYPEGENname '(' ')'
2451	{ $$ = DeclarationNode::newFromTypeGen( $1, nullptr ); }
2452	\| TYPEGENname '(' type_list ')'
2453	{ $$ = DeclarationNode::newFromTypeGen( $1, $3 ); }
2454	;
2455
2456	elaborated_type: // struct, union, enum
2457	aggregate_type
2458	\| enum_type
2459	;
2460
2461	elaborated_type_nobody: // struct, union, enum - {...}
2462	aggregate_type_nobody
2463	\| enum_type_nobody
2464	;
2465
2466	aggregate_type: // struct, union
2467	aggregate_key attribute_list_opt
2468	{ forall = false; } // reset
2469	'{' field_declaration_list_opt '}' type_parameters_opt
2470	{ $$ = DeclarationNode::newAggregate( $1, nullptr, $7, $5, true )->addQualifiers( $2 ); }
2471	\| aggregate_key attribute_list_opt identifier
2472	{
2473	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 1" );
2474	forall = false; // reset
2475	}
2476	'{' field_declaration_list_opt '}' type_parameters_opt
2477	{
2478	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2479	}
2480	\| aggregate_key attribute_list_opt TYPEDEFname // unqualified type name
2481	{
2482	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 2" );
2483	forall = false; // reset
2484	}
2485	'{' field_declaration_list_opt '}' type_parameters_opt
2486	{
2487	DeclarationNode::newFromTypedef( $3 );
2488	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2489	}
2490	\| aggregate_key attribute_list_opt TYPEGENname // unqualified type name
2491	{
2492	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 3" );
2493	forall = false; // reset
2494	}
2495	'{' field_declaration_list_opt '}' type_parameters_opt
2496	{
2497	DeclarationNode::newFromTypeGen( $3, nullptr );
2498	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2499	}
2500	\| aggregate_type_nobody
2501	;
2502
2503	type_parameters_opt:
2504	// empty
2505	{ $$ = nullptr; } %prec '}'
2506	\| '(' type_list ')'
2507	{ $$ = $2; }
2508	;
2509
2510	aggregate_type_nobody: // struct, union - {...}
2511	aggregate_key attribute_list_opt identifier
2512	{
2513	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type_nobody" );
2514	forall = false; // reset
2515	$$ = DeclarationNode::newAggregate( $1, $3, nullptr, nullptr, false )->addQualifiers( $2 );
2516	}
2517	\| aggregate_key attribute_list_opt type_name
2518	{
2519	forall = false; // reset
2520	// Create new generic declaration with same name as previous forward declaration, where the IDENTIFIER is
2521	// switched to a TYPEGENname. Link any generic arguments from typegen_name to new generic declaration and
2522	// delete newFromTypeGen.
2523	if ( $3->type->kind == TypeData::SymbolicInst && ! $3->type->symbolic.isTypedef ) {
2524	$$ = $3->addQualifiers( $2 );
2525	} else {
2526	$$ = DeclarationNode::newAggregate( $1, $3->type->symbolic.name, $3->type->symbolic.actuals, nullptr, false )->addQualifiers( $2 );
2527	$3->type->symbolic.name = nullptr; // copied to $$
2528	$3->type->symbolic.actuals = nullptr;
2529	delete $3;
2530	}
2531	}
2532	;
2533
2534	aggregate_key:
2535	aggregate_data
2536	\| aggregate_control
2537	;
2538
2539	aggregate_data:
2540	STRUCT vtable_opt
2541	{ $$ = ast::AggregateDecl::Struct; }
2542	\| UNION
2543	{ $$ = ast::AggregateDecl::Union; }
2544	\| EXCEPTION // CFA
2545	{ $$ = ast::AggregateDecl::Exception; }
2546	// { SemanticError( yylloc, "exception aggregate is currently unimplemented." ); $$ = ast::AggregateDecl::NoAggregate; }
2547	;
2548
2549	aggregate_control: // CFA
2550	MONITOR
2551	{ $$ = ast::AggregateDecl::Monitor; }
2552	\| MUTEX STRUCT
2553	{ $$ = ast::AggregateDecl::Monitor; }
2554	\| GENERATOR
2555	{ $$ = ast::AggregateDecl::Generator; }
2556	\| MUTEX GENERATOR
2557	{
2558	SemanticError( yylloc, "monitor generator is currently unimplemented." );
2559	$$ = ast::AggregateDecl::NoAggregate;
2560	}
2561	\| COROUTINE
2562	{ $$ = ast::AggregateDecl::Coroutine; }
2563	\| MUTEX COROUTINE
2564	{
2565	SemanticError( yylloc, "monitor coroutine is currently unimplemented." );
2566	$$ = ast::AggregateDecl::NoAggregate;
2567	}
2568	\| THREAD
2569	{ $$ = ast::AggregateDecl::Thread; }
2570	\| MUTEX THREAD
2571	{
2572	SemanticError( yylloc, "monitor thread is currently unimplemented." );
2573	$$ = ast::AggregateDecl::NoAggregate;
2574	}
2575	;
2576
2577	field_declaration_list_opt:
2578	// empty
2579	{ $$ = nullptr; }
2580	\| field_declaration_list_opt field_declaration
2581	{ $$ = $1 ? $1->set_last( $2 ) : $2; }
2582	;
2583
2584	field_declaration:
2585	type_specifier field_declaring_list_opt ';'
2586	{
2587	// printf( "type_specifier1 %p %s\n", $$, $$->type->aggregate.name ? $$->type->aggregate.name->c_str() : "(nil)" );
2588	$$ = fieldDecl( $1, $2 );
2589	// printf( "type_specifier2 %p %s\n", $$, $$->type->aggregate.name ? $$->type->aggregate.name->c_str() : "(nil)" );
2590	// for ( Attribute * attr: reverseIterate( $$->attributes ) ) {
2591	// printf( "\tattr %s\n", attr->name.c_str() );
2592	// } // for
2593	}
2594	\| type_specifier field_declaring_list_opt '}' // invalid syntax rule
2595	{
2596	SemanticError( yylloc, "syntax error, expecting ';' at end of previous declaration." );
2597	$$ = nullptr;
2598	}
2599	\| EXTENSION type_specifier field_declaring_list_opt ';' // GCC
2600	{ $$ = fieldDecl( $2, $3 ); distExt( $$ ); }
2601	\| STATIC type_specifier field_declaring_list_opt ';' // CFA
2602	{ SemanticError( yylloc, "STATIC aggregate field qualifier currently unimplemented." ); $$ = nullptr; }
2603	\| INLINE type_specifier field_abstract_list_opt ';' // CFA
2604	{
2605	if ( ! $3 ) { // field declarator ?
2606	$3 = DeclarationNode::newName( nullptr );
2607	} // if
2608	$3->inLine = true;
2609	$$ = distAttr( $2, $3 ); // mark all fields in list
2610	distInl( $3 );
2611	}
2612	\| INLINE aggregate_control ';' // CFA
2613	{ SemanticError( yylloc, "INLINE aggregate control currently unimplemented." ); $$ = nullptr; }
2614	\| typedef_declaration ';' // CFA
2615	\| cfa_field_declaring_list ';' // CFA, new style field declaration
2616	\| EXTENSION cfa_field_declaring_list ';' // GCC
2617	{ distExt( $2 ); $$ = $2; } // mark all fields in list
2618	\| INLINE cfa_field_abstract_list ';' // CFA, new style field declaration
2619	{ $$ = $2; } // mark all fields in list
2620	\| cfa_typedef_declaration ';' // CFA
2621	\| static_assert // C11
2622	;
2623
2624	field_declaring_list_opt:
2625	// empty
2626	{ $$ = nullptr; }
2627	\| field_declarator
2628	\| field_declaring_list_opt ',' attribute_list_opt field_declarator
2629	{ $$ = $1->set_last( $4->addQualifiers( $3 ) ); }
2630	;
2631
2632	field_declarator:
2633	bit_subrange_size // C special case, no field name
2634	{ $$ = DeclarationNode::newBitfield( $1 ); }
2635	\| variable_declarator bit_subrange_size_opt
2636	// A semantic check is required to ensure bit_subrange only appears on integral types.
2637	{ $$ = $1->addBitfield( $2 ); }
2638	\| variable_type_redeclarator bit_subrange_size_opt
2639	// A semantic check is required to ensure bit_subrange only appears on integral types.
2640	{ $$ = $1->addBitfield( $2 ); }
2641	\| function_type_redeclarator bit_subrange_size_opt
2642	// A semantic check is required to ensure bit_subrange only appears on integral types.
2643	{ $$ = $1->addBitfield( $2 ); }
2644	;
2645
2646	field_abstract_list_opt:
2647	// empty
2648	{ $$ = nullptr; }
2649	\| field_abstract
2650	\| field_abstract_list_opt ',' attribute_list_opt field_abstract
2651	{ $$ = $1->set_last( $4->addQualifiers( $3 ) ); }
2652	;
2653
2654	field_abstract:
2655	// no bit fields
2656	variable_abstract_declarator
2657	;
2658
2659	cfa_field_declaring_list: // CFA, new style field declaration
2660	// bit-fields are handled by C declarations
2661	cfa_abstract_declarator_tuple identifier_or_type_name
2662	{ $$ = $1->addName( $2 ); }
2663	\| cfa_field_declaring_list ',' identifier_or_type_name
2664	{ $$ = $1->set_last( $1->cloneType( $3 ) ); }
2665	;
2666
2667	cfa_field_abstract_list: // CFA, new style field declaration
2668	// bit-fields are handled by C declarations
2669	cfa_abstract_declarator_tuple
2670	\| cfa_field_abstract_list ','
2671	{ $$ = $1->set_last( $1->cloneType( 0 ) ); }
2672	;
2673
2674	bit_subrange_size_opt:
2675	// empty
2676	{ $$ = nullptr; }
2677	\| bit_subrange_size
2678	;
2679
2680	bit_subrange_size:
2681	':' assignment_expression
2682	{ $$ = $2; }
2683	;
2684
2685	// ***********
2686	// Enumeration
2687	// ***********
2688
2689	enum_type:
2690	ENUM attribute_list_opt '{' enumerator_list comma_opt '}'
2691	{ $$ = DeclarationNode::newEnum( nullptr, $4, true, false )->addQualifiers( $2 ); }
2692	\| ENUM attribute_list_opt '!' '{' enumerator_list comma_opt '}' // invalid syntax rule
2693	{ SemanticError( yylloc, "syntax error, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr; }
2694	\| ENUM attribute_list_opt identifier
2695	{ typedefTable.makeTypedef( *$3, "enum_type 1" ); }
2696	hide_opt '{' enumerator_list comma_opt '}'
2697	{ $$ = DeclarationNode::newEnum( $3, $7, true, false, nullptr, $5 )->addQualifiers( $2 ); }
2698	\| ENUM attribute_list_opt typedef_name hide_opt '{' enumerator_list comma_opt '}' // unqualified type name
2699	{ $$ = DeclarationNode::newEnum( $3->name, $6, true, false, nullptr, $4 )->addQualifiers( $2 ); }
2700	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt '{' enumerator_list comma_opt '}'
2701	{
2702	if ( $3->storageClasses.val != 0 \|\| $3->type->qualifiers.any() ) {
2703	SemanticError( yylloc, "syntax error, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
2704	}
2705	$$ = DeclarationNode::newEnum( nullptr, $7, true, true, $3 )->addQualifiers( $5 );
2706	}
2707	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt '!' '{' enumerator_list comma_opt '}' // unqualified type name
2708	{ SemanticError( yylloc, "syntax error, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr; }
2709	\| ENUM '(' ')' attribute_list_opt '{' enumerator_list comma_opt '}'
2710	{
2711	$$ = DeclarationNode::newEnum( nullptr, $6, true, true )->addQualifiers( $4 );
2712	}
2713	\| ENUM '(' ')' attribute_list_opt '!' '{' enumerator_list comma_opt '}' // invalid syntax rule
2714	{ SemanticError( yylloc, "syntax error, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr; }
2715	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt identifier attribute_list_opt
2716	{
2717	if ( $3 && ($3->storageClasses.any() \|\| $3->type->qualifiers.val != 0) ) {
2718	SemanticError( yylloc, "syntax error, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
2719	}
2720	typedefTable.makeTypedef( *$6, "enum_type 2" );
2721	}
2722	hide_opt '{' enumerator_list comma_opt '}'
2723	{
2724	$$ = DeclarationNode::newEnum( $6, $11, true, true, $3, $9 )->addQualifiers( $5 )->addQualifiers( $7 );
2725	}
2726	\| ENUM '(' ')' attribute_list_opt identifier attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2727	{
2728	$$ = DeclarationNode::newEnum( $5, $9, true, true, nullptr, $7 )->addQualifiers( $4 )->addQualifiers( $6 );
2729	}
2730	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt typedef_name attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2731	{
2732	$$ = DeclarationNode::newEnum( $6->name, $10, true, true, $3, $8 )->addQualifiers( $5 )->addQualifiers( $7 );
2733	}
2734	\| ENUM '(' ')' attribute_list_opt typedef_name attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2735	{
2736	$$ = DeclarationNode::newEnum( $5->name, $9, true, true, nullptr, $7 )->addQualifiers( $4 )->addQualifiers( $6 );
2737	}
2738	\| enum_type_nobody
2739	;
2740
2741	hide_opt:
2742	// empty
2743	{ $$ = EnumHiding::Visible; }
2744	\| '!'
2745	{ $$ = EnumHiding::Hide; }
2746	;
2747
2748	enum_type_nobody: // enum - {...}
2749	ENUM attribute_list_opt identifier
2750	{
2751	typedefTable.makeTypedef( *$3, "enum_type_nobody 1" );
2752	$$ = DeclarationNode::newEnum( $3, nullptr, false, false )->addQualifiers( $2 );
2753	}
2754	\| ENUM attribute_list_opt type_name
2755	{
2756	typedefTable.makeTypedef( *$3->type->symbolic.name, "enum_type_nobody 2" );
2757	$$ = DeclarationNode::newEnum( $3->type->symbolic.name, nullptr, false, false )->addQualifiers( $2 );
2758	}
2759	;
2760
2761	enumerator_list:
2762	visible_hide_opt identifier_or_type_name enumerator_value_opt
2763	{ $$ = DeclarationNode::newEnumValueGeneric( $2, $3 ); }
2764	\| INLINE type_name
2765	{ $$ = DeclarationNode::newEnumInLine( *$2->type->symbolic.name ); }
2766	\| enumerator_list ',' visible_hide_opt identifier_or_type_name enumerator_value_opt
2767	{ $$ = $1->set_last( DeclarationNode::newEnumValueGeneric( $4, $5 ) ); }
2768	\| enumerator_list ',' INLINE type_name enumerator_value_opt
2769	{ $$ = $1->set_last( DeclarationNode::newEnumValueGeneric( new string("inline"), nullptr ) ); }
2770	;
2771
2772	visible_hide_opt:
2773	hide_opt
2774	\| '^'
2775	{ $$ = EnumHiding::Visible; }
2776	;
2777
2778	enumerator_value_opt:
2779	// empty
2780	{ $$ = nullptr; }
2781	\| '=' constant_expression { $$ = new InitializerNode( $2 ); }
2782	\| '=' '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $3, true ); }
2783	// \| simple_assignment_operator initializer
2784	// { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
2785	;
2786
2787	// *******************
2788	// Function parameters
2789	// *******************
2790
2791	parameter_list_ellipsis_opt:
2792	// empty
2793	{ $$ = nullptr; }
2794	\| ELLIPSIS
2795	{ $$ = nullptr; }
2796	\| parameter_list
2797	\| parameter_list ',' ELLIPSIS
2798	{ $$ = $1->addVarArgs(); }
2799	;
2800
2801	parameter_list: // abstract + real
2802	parameter_declaration
2803	\| abstract_parameter_declaration
2804	\| parameter_list ',' parameter_declaration
2805	{ $$ = $1->set_last( $3 ); }
2806	\| parameter_list ',' abstract_parameter_declaration
2807	{ $$ = $1->set_last( $3 ); }
2808	;
2809
2810	cfa_parameter_list_ellipsis_opt: // CFA, abstract + real
2811	// empty
2812	{ $$ = DeclarationNode::newBasicType( DeclarationNode::Void ); }
2813	\| ELLIPSIS
2814	{ $$ = nullptr; }
2815	\| cfa_parameter_list
2816	\| cfa_abstract_parameter_list
2817	\| cfa_parameter_list ',' cfa_abstract_parameter_list
2818	{ $$ = $1->set_last( $3 ); }
2819	\| cfa_parameter_list ',' ELLIPSIS
2820	{ $$ = $1->addVarArgs(); }
2821	\| cfa_abstract_parameter_list ',' ELLIPSIS
2822	{ $$ = $1->addVarArgs(); }
2823	;
2824
2825	cfa_parameter_list: // CFA
2826	// To obtain LR(1) between cfa_parameter_list and cfa_abstract_tuple, the last cfa_abstract_parameter_list is
2827	// factored out from cfa_parameter_list, flattening the rules to get lookahead to the ']'.
2828	cfa_parameter_declaration
2829	\| cfa_abstract_parameter_list ',' cfa_parameter_declaration
2830	{ $$ = $1->set_last( $3 ); }
2831	\| cfa_parameter_list ',' cfa_parameter_declaration
2832	{ $$ = $1->set_last( $3 ); }
2833	\| cfa_parameter_list ',' cfa_abstract_parameter_list ',' cfa_parameter_declaration
2834	{ $$ = $1->set_last( $3 )->set_last( $5 ); }
2835	;
2836
2837	cfa_abstract_parameter_list: // CFA, new & old style abstract
2838	cfa_abstract_parameter_declaration
2839	\| cfa_abstract_parameter_list ',' cfa_abstract_parameter_declaration
2840	{ $$ = $1->set_last( $3 ); }
2841	;
2842
2843	// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
2844	// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.
2845
2846	parameter_declaration:
2847	// No SUE declaration in parameter list.
2848	declaration_specifier_nobody identifier_parameter_declarator default_initializer_opt
2849	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2850	\| declaration_specifier_nobody type_parameter_redeclarator default_initializer_opt
2851	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2852	;
2853
2854	abstract_parameter_declaration:
2855	declaration_specifier_nobody default_initializer_opt
2856	{ $$ = $1->addInitializer( $2 ? new InitializerNode( $2 ) : nullptr ); }
2857	\| declaration_specifier_nobody abstract_parameter_declarator default_initializer_opt
2858	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2859	;
2860
2861	cfa_parameter_declaration: // CFA, new & old style parameter declaration
2862	parameter_declaration
2863	\| cfa_identifier_parameter_declarator_no_tuple identifier_or_type_name default_initializer_opt
2864	{ $$ = $1->addName( $2 ); }
2865	\| cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2866	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2867	{ $$ = $1->addName( $2 ); }
2868	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2869	{ $$ = $2->addName( $3 )->addQualifiers( $1 ); }
2870	\| cfa_function_specifier
2871	;
2872
2873	cfa_abstract_parameter_declaration: // CFA, new & old style parameter declaration
2874	abstract_parameter_declaration
2875	\| cfa_identifier_parameter_declarator_no_tuple
2876	\| cfa_abstract_tuple
2877	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2878	\| type_qualifier_list cfa_abstract_tuple
2879	{ $$ = $2->addQualifiers( $1 ); }
2880	\| cfa_abstract_function
2881	;
2882
2883	// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
2884	// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
2885	// identifiers. The ANSI-style parameter-list can redefine a typedef name.
2886
2887	identifier_list: // K&R-style parameter list => no types
2888	identifier
2889	{ $$ = DeclarationNode::newName( $1 ); }
2890	\| identifier_list ',' identifier
2891	{ $$ = $1->set_last( DeclarationNode::newName( $3 ) ); }
2892	;
2893
2894	identifier_or_type_name:
2895	identifier
2896	\| TYPEDEFname
2897	\| TYPEGENname
2898	;
2899
2900	type_no_function: // sizeof, alignof, cast (constructor)
2901	cfa_abstract_declarator_tuple // CFA
2902	\| type_specifier // cannot be type_specifier_nobody, e.g., (struct S {}){} is a thing
2903	\| type_specifier abstract_declarator
2904	{ $$ = $2->addType( $1 ); }
2905	;
2906
2907	type: // typeof, assertion
2908	type_no_function
2909	\| cfa_abstract_function // CFA
2910	;
2911
2912	initializer_opt:
2913	// empty
2914	{ $$ = nullptr; }
2915	\| simple_assignment_operator initializer { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
2916	\| '=' VOID { $$ = new InitializerNode( true ); }
2917	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2918	;
2919
2920	initializer:
2921	assignment_expression { $$ = new InitializerNode( $1 ); }
2922	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2923	;
2924
2925	initializer_list_opt:
2926	// empty
2927	{ $$ = nullptr; }
2928	\| initializer
2929	\| designation initializer { $$ = $2->set_designators( $1 ); }
2930	\| initializer_list_opt ',' initializer { $$ = (InitializerNode *)( $1->set_last( $3 ) ); }
2931	\| initializer_list_opt ',' designation initializer { $$ = (InitializerNode *)($1->set_last( $4->set_designators( $3 ) )); }
2932	;
2933
2934	// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
2935	// '=' to separator the designator from the initializer value, as in:
2936	//
2937	// int x[10] = { [1] = 3 };
2938	//
2939	// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment. To disambiguate this case, CFA
2940	// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
2941	// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
2942	// shift/reduce conflicts
2943
2944	designation:
2945	designator_list ':' // C99, CFA uses ":" instead of "="
2946	\| identifier_at ':' // GCC, field name
2947	{ $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
2948	;
2949
2950	designator_list: // C99
2951	designator
2952	\| designator_list designator
2953	{ $$ = (ExpressionNode *)($1->set_last( $2 )); }
2954	//\| designator_list designator { $$ = new ExpressionNode( $1, $2 ); }
2955	;
2956
2957	designator:
2958	'.' identifier_at // C99, field name
2959	{ $$ = new ExpressionNode( build_varref( yylloc, $2 ) ); }
2960	\| '[' push assignment_expression pop ']' // C99, single array element
2961	// assignment_expression used instead of constant_expression because of shift/reduce conflicts with tuple.
2962	{ $$ = $3; }
2963	\| '[' push subrange pop ']' // CFA, multiple array elements
2964	{ $$ = $3; }
2965	\| '[' push constant_expression ELLIPSIS constant_expression pop ']' // GCC, multiple array elements
2966	{ $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $3 ), maybeMoveBuild( $5 ) ) ); }
2967	\| '.' '[' push field_name_list pop ']' // CFA, tuple field selector
2968	{ $$ = $4; }
2969	;
2970
2971	// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
2972	// rather than an object-oriented type system. This required four groups of extensions:
2973	//
2974	// Overloading: function, data, and operator identifiers may be overloaded.
2975	//
2976	// Type declarations: "otype" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
2977	// and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
2978	// definitions of new types. Type declarations with storage class "extern" provide opaque types.
2979	//
2980	// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
2981	// site. A polymorphic function is not a template; it is a function, with an address and a type.
2982	//
2983	// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
2984	// types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
2985	// hierarchies. Unlike classes, they can define relationships between types. Assertions declare that a type or
2986	// types provide the operations declared by a specification. Assertions are normally used to declare requirements
2987	// on type arguments of polymorphic functions.
2988
2989	type_parameter_list: // CFA
2990	type_parameter
2991	\| type_parameter_list ',' type_parameter
2992	{ $$ = $1->set_last( $3 ); }
2993	;
2994
2995	type_initializer_opt: // CFA
2996	// empty
2997	{ $$ = nullptr; }
2998	\| '=' type
2999	{ $$ = $2; }
3000	;
3001
3002	type_parameter: // CFA
3003	type_class identifier_or_type_name
3004	{
3005	typedefTable.addToScope( *$2, TYPEDEFname, "type_parameter 1" );
3006	if ( $1 == ast::TypeDecl::Otype ) { SemanticError( yylloc, "otype keyword is deprecated, use T " ); }
3007	if ( $1 == ast::TypeDecl::Dtype ) { SemanticError( yylloc, "dtype keyword is deprecated, use T &" ); }
3008	if ( $1 == ast::TypeDecl::Ttype ) { SemanticError( yylloc, "ttype keyword is deprecated, use T ..." ); }
3009	}
3010	type_initializer_opt assertion_list_opt
3011	{ $$ = DeclarationNode::newTypeParam( $1, $2 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
3012	\| identifier_or_type_name new_type_class
3013	{ typedefTable.addToScope( *$1, TYPEDEFname, "type_parameter 2" ); }
3014	type_initializer_opt assertion_list_opt
3015	{ $$ = DeclarationNode::newTypeParam( $2, $1 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
3016	\| '[' identifier_or_type_name ']'
3017	{
3018	typedefTable.addToScope( *$2, TYPEDIMname, "type_parameter 3" );
3019	$$ = DeclarationNode::newTypeParam( ast::TypeDecl::Dimension, $2 );
3020	}
3021	// \| type_specifier identifier_parameter_declarator
3022	\| assertion_list
3023	{ $$ = DeclarationNode::newTypeParam( ast::TypeDecl::Dtype, new string( DeclarationNode::anonymous.newName() ) )->addAssertions( $1 ); }
3024	\| ENUM '(' identifier_or_type_name ')' identifier_or_type_name new_type_class type_initializer_opt assertion_list_opt
3025	{
3026	typedefTable.addToScope( *$3, TYPEDIMname, "type_parameter 4" );
3027	typedefTable.addToScope( *$5, TYPEDIMname, "type_parameter 5" );
3028	$$ = DeclarationNode::newTypeParam( $6, $5 )->addTypeInitializer( $7 )->addAssertions( $8 );
3029	}
3030	;
3031
3032	new_type_class: // CFA
3033	// empty
3034	{ $$ = ast::TypeDecl::Otype; }
3035	\| '&'
3036	{ $$ = ast::TypeDecl::Dtype; }
3037	\| '*'
3038	{ $$ = ast::TypeDecl::DStype; } // dtype + sized
3039	// \| '(' '*' ')'
3040	// { $$ = ast::TypeDecl::Ftype; }
3041	\| ELLIPSIS
3042	{ $$ = ast::TypeDecl::Ttype; }
3043	;
3044
3045	type_class: // CFA
3046	OTYPE
3047	{ $$ = ast::TypeDecl::Otype; }
3048	\| DTYPE
3049	{ $$ = ast::TypeDecl::Dtype; }
3050	\| FTYPE
3051	{ $$ = ast::TypeDecl::Ftype; }
3052	\| TTYPE
3053	{ $$ = ast::TypeDecl::Ttype; }
3054	;
3055
3056	assertion_list_opt: // CFA
3057	// empty
3058	{ $$ = nullptr; }
3059	\| assertion_list
3060	;
3061
3062	assertion_list: // CFA
3063	assertion
3064	\| assertion_list assertion
3065	{ $$ = $1->set_last( $2 ); }
3066	;
3067
3068	assertion: // CFA
3069	'\|' identifier_or_type_name '(' type_list ')'
3070	{ $$ = DeclarationNode::newTraitUse( $2, $4 ); }
3071	\| '\|' '{' push trait_declaration_list pop '}'
3072	{ $$ = $4; }
3073	// \| '\|' '(' push type_parameter_list pop ')' '{' push trait_declaration_list pop '}' '(' type_list ')'
3074	// { SemanticError( yylloc, "Generic data-type assertion is currently unimplemented." ); $$ = nullptr; }
3075	;
3076
3077	type_list: // CFA
3078	type
3079	{ $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3080	\| assignment_expression
3081	\| type_list ',' type
3082	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) )); }
3083	\| type_list ',' assignment_expression
3084	{ $$ = (ExpressionNode *)( $1->set_last( $3 )); }
3085	;
3086
3087	type_declaring_list: // CFA
3088	OTYPE type_declarator
3089	{ $$ = $2; }
3090	\| storage_class_list OTYPE type_declarator
3091	{ $$ = $3->addQualifiers( $1 ); }
3092	\| type_declaring_list ',' type_declarator
3093	{ $$ = $1->set_last( $3->copySpecifiers( $1 ) ); }
3094	;
3095
3096	type_declarator: // CFA
3097	type_declarator_name assertion_list_opt
3098	{ $$ = $1->addAssertions( $2 ); }
3099	\| type_declarator_name assertion_list_opt '=' type
3100	{ $$ = $1->addAssertions( $2 )->addType( $4 ); }
3101	;
3102
3103	type_declarator_name: // CFA
3104	identifier_or_type_name
3105	{
3106	typedefTable.addToEnclosingScope( *$1, TYPEDEFname, "type_declarator_name 1" );
3107	$$ = DeclarationNode::newTypeDecl( $1, nullptr );
3108	}
3109	\| identifier_or_type_name '(' type_parameter_list ')'
3110	{
3111	typedefTable.addToEnclosingScope( *$1, TYPEGENname, "type_declarator_name 2" );
3112	$$ = DeclarationNode::newTypeDecl( $1, $3 );
3113	}
3114	;
3115
3116	trait_specifier: // CFA
3117	TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' '}'
3118	{
3119	SemanticWarning( yylloc, Warning::DeprecTraitSyntax );
3120	$$ = DeclarationNode::newTrait( $2, $4, nullptr );
3121	}
3122	\| forall TRAIT identifier_or_type_name '{' '}' // alternate
3123	{ $$ = DeclarationNode::newTrait( $3, $1, nullptr ); }
3124	\| TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' push trait_declaration_list pop '}'
3125	{
3126	SemanticWarning( yylloc, Warning::DeprecTraitSyntax );
3127	$$ = DeclarationNode::newTrait( $2, $4, $8 );
3128	}
3129	\| forall TRAIT identifier_or_type_name '{' push trait_declaration_list pop '}' // alternate
3130	{ $$ = DeclarationNode::newTrait( $3, $1, $6 ); }
3131	;
3132
3133	trait_declaration_list: // CFA
3134	trait_declaration
3135	\| trait_declaration_list pop push trait_declaration
3136	{ $$ = $1->set_last( $4 ); }
3137	;
3138
3139	trait_declaration: // CFA
3140	cfa_trait_declaring_list ';'
3141	\| trait_declaring_list ';'
3142	;
3143
3144	cfa_trait_declaring_list: // CFA
3145	cfa_variable_specifier
3146	\| cfa_function_specifier
3147	\| cfa_trait_declaring_list pop ',' push identifier_or_type_name
3148	{ $$ = $1->set_last( $1->cloneType( $5 ) ); }
3149	;
3150
3151	trait_declaring_list: // CFA
3152	type_specifier declarator
3153	{ $$ = $2->addType( $1 ); }
3154	\| trait_declaring_list pop ',' push declarator
3155	{ $$ = $1->set_last( $1->cloneBaseType( $5 ) ); }
3156	;
3157
3158	// ************************** EXTERNAL DEFINITIONS ***************************
3159
3160	translation_unit:
3161	// empty, input file
3162	\| external_definition_list
3163	{ parseTree = parseTree ? parseTree->set_last( $1 ) : $1; }
3164	;
3165
3166	external_definition_list:
3167	push external_definition pop
3168	{ $$ = $2; }
3169	\| external_definition_list push external_definition pop
3170	{ $$ = $1 ? $1->set_last( $3 ) : $3; }
3171	;
3172
3173	external_definition_list_opt:
3174	// empty
3175	{ $$ = nullptr; }
3176	\| external_definition_list
3177	;
3178
3179	up:
3180	{ typedefTable.up( forall ); forall = false; }
3181	;
3182
3183	down:
3184	{ typedefTable.down(); }
3185	;
3186
3187	external_definition:
3188	DIRECTIVE
3189	{ $$ = DeclarationNode::newDirectiveStmt( new StatementNode( build_directive( yylloc, $1 ) ) ); }
3190	\| declaration
3191	{
3192	// Variable declarations of anonymous types requires creating a unique type-name across multiple translation
3193	// unit, which is a dubious task, especially because C uses name rather than structural typing; hence it is
3194	// disallowed at the moment.
3195	if ( $1->linkage == ast::Linkage::Cforall && ! $1->storageClasses.is_static &&
3196	$1->type && $1->type->kind == TypeData::AggregateInst ) {
3197	if ( $1->type->aggInst.aggregate->kind == TypeData::Enum && $1->type->aggInst.aggregate->enumeration.anon ) {
3198	SemanticError( yylloc, "extern anonymous enumeration is currently unimplemented." ); $$ = nullptr;
3199	} else if ( $1->type->aggInst.aggregate->aggregate.anon ) { // handles struct or union
3200	SemanticError( yylloc, "extern anonymous struct/union is currently unimplemented." ); $$ = nullptr;
3201	}
3202	}
3203	}
3204	\| IDENTIFIER IDENTIFIER
3205	{ IdentifierBeforeIdentifier( $1.str, $2.str, " declaration" ); $$ = nullptr; }
3206	\| IDENTIFIER type_qualifier // invalid syntax rule
3207	{ IdentifierBeforeType( *$1.str, "type qualifier" ); $$ = nullptr; }
3208	\| IDENTIFIER storage_class // invalid syntax rule
3209	{ IdentifierBeforeType( *$1.str, "storage class" ); $$ = nullptr; }
3210	\| IDENTIFIER basic_type_name // invalid syntax rule
3211	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3212	\| IDENTIFIER TYPEDEFname // invalid syntax rule
3213	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3214	\| IDENTIFIER TYPEGENname // invalid syntax rule
3215	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3216	\| external_function_definition
3217	\| EXTENSION external_definition // GCC, multiple __extension__ allowed, meaning unknown
3218	{
3219	distExt( $2 ); // mark all fields in list
3220	$$ = $2;
3221	}
3222	\| ASM '(' string_literal ')' ';' // GCC, global assembler statement
3223	{ $$ = DeclarationNode::newAsmStmt( new StatementNode( build_asm( yylloc, false, $3, nullptr ) ) ); }
3224	\| EXTERN STRINGliteral
3225	{
3226	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
3227	linkage = ast::Linkage::update( yylloc, linkage, $2 );
3228	}
3229	up external_definition down
3230	{
3231	linkage = linkageStack.top();
3232	linkageStack.pop();
3233	$$ = $5;
3234	}
3235	\| EXTERN STRINGliteral // C++-style linkage specifier
3236	{
3237	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
3238	linkage = ast::Linkage::update( yylloc, linkage, $2 );
3239	}
3240	'{' up external_definition_list_opt down '}'
3241	{
3242	linkage = linkageStack.top();
3243	linkageStack.pop();
3244	$$ = $6;
3245	}
3246	// global distribution
3247	\| type_qualifier_list
3248	{
3249	if ( $1->type->qualifiers.any() ) {
3250	SemanticError( yylloc, "syntax error, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3251	}
3252	if ( $1->type->forall ) forall = true; // remember generic type
3253	}
3254	'{' up external_definition_list_opt down '}' // CFA, namespace
3255	{
3256	distQual( $5, $1 );
3257	forall = false;
3258	$$ = $5;
3259	}
3260	\| declaration_qualifier_list
3261	{
3262	if ( $1->type && $1->type->qualifiers.any() ) {
3263	SemanticError( yylloc, "syntax error, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3264	}
3265	if ( $1->type && $1->type->forall ) forall = true; // remember generic type
3266	}
3267	'{' up external_definition_list_opt down '}' // CFA, namespace
3268	{
3269	distQual( $5, $1 );
3270	forall = false;
3271	$$ = $5;
3272	}
3273	\| declaration_qualifier_list type_qualifier_list
3274	{
3275	if ( ($1->type && $1->type->qualifiers.any()) \|\| ($2->type && $2->type->qualifiers.any()) ) {
3276	SemanticError( yylloc, "syntax error, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3277	}
3278	if ( ($1->type && $1->type->forall) \|\| ($2->type && $2->type->forall) ) forall = true; // remember generic type
3279	}
3280	'{' up external_definition_list_opt down '}' // CFA, namespace
3281	{
3282	distQual( $6, $1->addQualifiers( $2 ) );
3283	forall = false;
3284	$$ = $6;
3285	}
3286	;
3287
3288	external_function_definition:
3289	function_definition
3290	// These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
3291	// legacy code with global functions missing the type-specifier for the return type, and assuming "int".
3292	// Parsing is possible because function_definition does not appear in the context of an expression (nested
3293	// functions preclude this concession, i.e., all nested function must have a return type). A function prototype
3294	// declaration must still have a type_specifier. OBSOLESCENT (see 1)
3295	\| function_declarator compound_statement
3296	{ $$ = $1->addFunctionBody( $2 ); }
3297	\| KR_function_declarator KR_parameter_list_opt compound_statement
3298	{ $$ = $1->addOldDeclList( $2 )->addFunctionBody( $3 ); }
3299	;
3300
3301	with_clause_opt:
3302	// empty
3303	{ $$ = nullptr; forall = false; }
3304	\| WITH '(' tuple_expression_list ')' attribute_list_opt
3305	{
3306	$$ = $3; forall = false;
3307	if ( $5 ) {
3308	SemanticError( yylloc, "syntax error, attributes cannot be associated with function body. Move attribute(s) before \"with\" clause." );
3309	$$ = nullptr;
3310	} // if
3311	}
3312	;
3313
3314	function_definition:
3315	cfa_function_declaration with_clause_opt compound_statement // CFA
3316	{
3317	// Add the function body to the last identifier in the function definition list, i.e., foo3:
3318	// [const double] foo1(), foo2( int ), foo3( double ) { return 3.0; }
3319	$1->get_last()->addFunctionBody( $3, $2 );
3320	$$ = $1;
3321	}
3322	\| declaration_specifier function_declarator with_clause_opt compound_statement
3323	{
3324	rebindForall( $1, $2 );
3325	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
3326	}
3327	\| declaration_specifier function_type_redeclarator with_clause_opt compound_statement
3328	{
3329	rebindForall( $1, $2 );
3330	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
3331	}
3332	// handles default int return type, OBSOLESCENT (see 1)
3333	\| type_qualifier_list function_declarator with_clause_opt compound_statement
3334	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
3335	// handles default int return type, OBSOLESCENT (see 1)
3336	\| declaration_qualifier_list function_declarator with_clause_opt compound_statement
3337	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
3338	// handles default int return type, OBSOLESCENT (see 1)
3339	\| declaration_qualifier_list type_qualifier_list function_declarator with_clause_opt compound_statement
3340	{ $$ = $3->addFunctionBody( $5, $4 )->addQualifiers( $2 )->addQualifiers( $1 ); }
3341
3342	// Old-style K&R function definition, OBSOLESCENT (see 4)
3343	\| declaration_specifier KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3344	{
3345	rebindForall( $1, $2 );
3346	$$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addType( $1 );
3347	}
3348	// handles default int return type, OBSOLESCENT (see 1)
3349	\| type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3350	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
3351	// handles default int return type, OBSOLESCENT (see 1)
3352	\| declaration_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3353	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
3354	// handles default int return type, OBSOLESCENT (see 1)
3355	\| declaration_qualifier_list type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3356	{ $$ = $3->addOldDeclList( $4 )->addFunctionBody( $6, $5 )->addQualifiers( $2 )->addQualifiers( $1 ); }
3357	;
3358
3359	declarator:
3360	variable_declarator
3361	\| variable_type_redeclarator
3362	\| function_declarator
3363	\| function_type_redeclarator
3364	;
3365
3366	subrange:
3367	constant_expression '~' constant_expression // CFA, integer subrange
3368	{ $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
3369	;
3370
3371	asm_name_opt: // GCC
3372	// empty
3373	{ $$ = nullptr; }
3374	\| ASM '(' string_literal ')' attribute_list_opt
3375	{
3376	DeclarationNode * name = new DeclarationNode();
3377	name->asmName = maybeMoveBuild( $3 );
3378	$$ = name->addQualifiers( $5 );
3379	}
3380	;
3381
3382	attribute_list_opt: // GCC
3383	// empty
3384	{ $$ = nullptr; }
3385	\| attribute_list
3386	;
3387
3388	attribute_list: // GCC
3389	attribute
3390	\| attribute_list attribute
3391	{ $$ = $2->addQualifiers( $1 ); }
3392	;
3393
3394	attribute: // GCC
3395	ATTRIBUTE '(' '(' attribute_name_list ')' ')'
3396	{ $$ = $4; }
3397	\| ATTRIBUTE '(' attribute_name_list ')' // CFA
3398	{ $$ = $3; }
3399	\| ATTR '(' attribute_name_list ')' // CFA
3400	{ $$ = $3; }
3401	;
3402
3403	attribute_name_list: // GCC
3404	attribute_name
3405	\| attribute_name_list ',' attribute_name
3406	{ $$ = $3->addQualifiers( $1 ); }
3407	;
3408
3409	attribute_name: // GCC
3410	// empty
3411	{ $$ = nullptr; }
3412	\| attr_name
3413	{ $$ = DeclarationNode::newAttribute( $1 ); }
3414	\| attr_name '(' argument_expression_list_opt ')'
3415	{ $$ = DeclarationNode::newAttribute( $1, $3 ); }
3416	;
3417
3418	attr_name: // GCC
3419	IDENTIFIER
3420	\| quasi_keyword
3421	\| TYPEDEFname
3422	\| TYPEGENname
3423	\| FALLTHROUGH
3424	{ $$ = Token{ new string( "fallthrough" ), { nullptr, -1 } }; }
3425	\| CONST
3426	{ $$ = Token{ new string( "__const__" ), { nullptr, -1 } }; }
3427	;
3428
3429	// ============================================================================
3430	// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
3431	// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
3432	// in:
3433	//
3434	// int (*f())[10] { ... };
3435	// ... (*f())[3] += 1; // definition mimics usage
3436	//
3437	// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
3438	// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
3439	// ============================================================================
3440
3441	// ----------------------------------------------------------------------------
3442	// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
3443	// to define a variable or function prototype, e.g.:
3444	//
3445	// valid declaration invalid definition
3446	// ----------------- ------------------
3447	// int f; int f {}
3448	// int f; int f {}
3449	// int f[10]; int f[10] {}
3450	// int (f)(int); int (f)(int) {}
3451	//
3452	// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
3453	// variable_declarator and function_declarator.
3454	// ----------------------------------------------------------------------------
3455
3456	// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
3457	// declaring an array of functions versus a pointer to an array of functions.
3458
3459	paren_identifier:
3460	identifier_at
3461	{ $$ = DeclarationNode::newName( $1 ); }
3462	\| '(' paren_identifier ')' // redundant parenthesis
3463	{ $$ = $2; }
3464	;
3465
3466	variable_declarator:
3467	paren_identifier attribute_list_opt
3468	{ $$ = $1->addQualifiers( $2 ); }
3469	\| variable_ptr
3470	\| variable_array attribute_list_opt
3471	{ $$ = $1->addQualifiers( $2 ); }
3472	\| variable_function attribute_list_opt
3473	{ $$ = $1->addQualifiers( $2 ); }
3474	;
3475
3476	variable_ptr:
3477	ptrref_operator variable_declarator
3478	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3479	\| ptrref_operator type_qualifier_list variable_declarator
3480	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3481	\| '(' variable_ptr ')' attribute_list_opt // redundant parenthesis
3482	{ $$ = $2->addQualifiers( $4 ); }
3483	\| '(' attribute_list variable_ptr ')' attribute_list_opt // redundant parenthesis
3484	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3485	;
3486
3487	variable_array:
3488	paren_identifier array_dimension
3489	{ $$ = $1->addArray( $2 ); }
3490	\| '(' variable_ptr ')' array_dimension
3491	{ $$ = $2->addArray( $4 ); }
3492	\| '(' attribute_list variable_ptr ')' array_dimension
3493	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3494	\| '(' variable_array ')' multi_array_dimension // redundant parenthesis
3495	{ $$ = $2->addArray( $4 ); }
3496	\| '(' attribute_list variable_array ')' multi_array_dimension // redundant parenthesis
3497	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3498	\| '(' variable_array ')' // redundant parenthesis
3499	{ $$ = $2; }
3500	\| '(' attribute_list variable_array ')' // redundant parenthesis
3501	{ $$ = $3->addQualifiers( $2 ); }
3502	;
3503
3504	variable_function:
3505	'(' variable_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3506	{ $$ = $2->addParamList( $5 ); }
3507	\| '(' attribute_list variable_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3508	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3509	\| '(' variable_function ')' // redundant parenthesis
3510	{ $$ = $2; }
3511	\| '(' attribute_list variable_function ')' // redundant parenthesis
3512	{ $$ = $3->addQualifiers( $2 ); }
3513	;
3514
3515	// This pattern parses a function declarator that is not redefining a typedef name. For non-nested functions, there is
3516	// no context where a function definition can redefine a typedef name, i.e., the typedef and function name cannot exist
3517	// is the same scope. The pattern precludes returning arrays and functions versus pointers to arrays and functions.
3518
3519	function_declarator:
3520	function_no_ptr attribute_list_opt
3521	{ $$ = $1->addQualifiers( $2 ); }
3522	\| function_ptr
3523	\| function_array attribute_list_opt
3524	{ $$ = $1->addQualifiers( $2 ); }
3525	;
3526
3527	function_no_ptr:
3528	paren_identifier '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3529	{ $$ = $1->addParamList( $3 ); }
3530	\| '(' function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3531	{ $$ = $2->addParamList( $5 ); }
3532	\| '(' attribute_list function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3533	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3534	\| '(' function_no_ptr ')' // redundant parenthesis
3535	{ $$ = $2; }
3536	\| '(' attribute_list function_no_ptr ')' // redundant parenthesis
3537	{ $$ = $3->addQualifiers( $2 ); }
3538	;
3539
3540	function_ptr:
3541	ptrref_operator function_declarator
3542	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3543	\| ptrref_operator type_qualifier_list function_declarator
3544	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3545	\| '(' function_ptr ')' attribute_list_opt
3546	{ $$ = $2->addQualifiers( $4 ); }
3547	\| '(' attribute_list function_ptr ')' attribute_list_opt
3548	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3549	;
3550
3551	function_array:
3552	'(' function_ptr ')' array_dimension
3553	{ $$ = $2->addArray( $4 ); }
3554	\| '(' attribute_list function_ptr ')' array_dimension
3555	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3556	\| '(' function_array ')' multi_array_dimension // redundant parenthesis
3557	{ $$ = $2->addArray( $4 ); }
3558	\| '(' attribute_list function_array ')' multi_array_dimension // redundant parenthesis
3559	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3560	\| '(' function_array ')' // redundant parenthesis
3561	{ $$ = $2; }
3562	\| '(' attribute_list function_array ')' // redundant parenthesis
3563	{ $$ = $3->addQualifiers( $2 ); }
3564	;
3565
3566	// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4)
3567	//
3568	// f( a, b, c ) int a, *b, c[]; {}
3569	//
3570	// that is not redefining a typedef name (see function_declarator for additional comments). The pattern precludes
3571	// returning arrays and functions versus pointers to arrays and functions.
3572
3573	KR_function_declarator:
3574	KR_function_no_ptr
3575	\| KR_function_ptr
3576	\| KR_function_array
3577	;
3578
3579	KR_function_no_ptr:
3580	paren_identifier '(' identifier_list ')' // function_declarator handles empty parameter
3581	{ $$ = $1->addIdList( $3 ); }
3582	\| '(' KR_function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3583	{ $$ = $2->addParamList( $5 ); }
3584	\| '(' attribute_list KR_function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3585	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3586	\| '(' KR_function_no_ptr ')' // redundant parenthesis
3587	{ $$ = $2; }
3588	\| '(' attribute_list KR_function_no_ptr ')' // redundant parenthesis
3589	{ $$ = $3->addQualifiers( $2 ); }
3590	;
3591
3592	KR_function_ptr:
3593	ptrref_operator KR_function_declarator
3594	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3595	\| ptrref_operator type_qualifier_list KR_function_declarator
3596	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3597	\| '(' KR_function_ptr ')'
3598	{ $$ = $2; }
3599	\| '(' attribute_list KR_function_ptr ')'
3600	{ $$ = $3->addQualifiers( $2 ); }
3601	;
3602
3603	KR_function_array:
3604	'(' KR_function_ptr ')' array_dimension
3605	{ $$ = $2->addArray( $4 ); }
3606	\| '(' attribute_list KR_function_ptr ')' array_dimension
3607	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3608	\| '(' KR_function_array ')' multi_array_dimension // redundant parenthesis
3609	{ $$ = $2->addArray( $4 ); }
3610	\| '(' attribute_list KR_function_array ')' multi_array_dimension // redundant parenthesis
3611	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3612	\| '(' KR_function_array ')' // redundant parenthesis
3613	{ $$ = $2; }
3614	\| '(' attribute_list KR_function_array ')' // redundant parenthesis
3615	{ $$ = $3->addQualifiers( $2 ); }
3616	;
3617
3618	// This pattern parses a declaration for a variable that redefines a type name, e.g.:
3619	//
3620	// typedef int foo;
3621	// {
3622	// int foo; // redefine typedef name in new scope
3623	// }
3624
3625	paren_type:
3626	typedef_name
3627	{
3628	// hide type name in enclosing scope by variable name
3629	typedefTable.addToEnclosingScope( *$1->name, IDENTIFIER, "paren_type" );
3630	}
3631	\| '(' paren_type ')'
3632	{ $$ = $2; }
3633	;
3634
3635	variable_type_redeclarator:
3636	paren_type attribute_list_opt
3637	{ $$ = $1->addQualifiers( $2 ); }
3638	\| variable_type_ptr
3639	\| variable_type_array attribute_list_opt
3640	{ $$ = $1->addQualifiers( $2 ); }
3641	\| variable_type_function attribute_list_opt
3642	{ $$ = $1->addQualifiers( $2 ); }
3643	;
3644
3645	variable_type_ptr:
3646	ptrref_operator variable_type_redeclarator
3647	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3648	\| ptrref_operator type_qualifier_list variable_type_redeclarator
3649	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3650	\| '(' variable_type_ptr ')' attribute_list_opt // redundant parenthesis
3651	{ $$ = $2->addQualifiers( $4 ); }
3652	\| '(' attribute_list variable_type_ptr ')' attribute_list_opt // redundant parenthesis
3653	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3654	;
3655
3656	variable_type_array:
3657	paren_type array_dimension
3658	{ $$ = $1->addArray( $2 ); }
3659	\| '(' variable_type_ptr ')' array_dimension
3660	{ $$ = $2->addArray( $4 ); }
3661	\| '(' attribute_list variable_type_ptr ')' array_dimension
3662	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3663	\| '(' variable_type_array ')' multi_array_dimension // redundant parenthesis
3664	{ $$ = $2->addArray( $4 ); }
3665	\| '(' attribute_list variable_type_array ')' multi_array_dimension // redundant parenthesis
3666	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3667	\| '(' variable_type_array ')' // redundant parenthesis
3668	{ $$ = $2; }
3669	\| '(' attribute_list variable_type_array ')' // redundant parenthesis
3670	{ $$ = $3->addQualifiers( $2 ); }
3671	;
3672
3673	variable_type_function:
3674	'(' variable_type_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3675	{ $$ = $2->addParamList( $5 ); }
3676	\| '(' attribute_list variable_type_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3677	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3678	\| '(' variable_type_function ')' // redundant parenthesis
3679	{ $$ = $2; }
3680	\| '(' attribute_list variable_type_function ')' // redundant parenthesis
3681	{ $$ = $3->addQualifiers( $2 ); }
3682	;
3683
3684	// This pattern parses a declaration for a function prototype that redefines a type name. It precludes declaring an
3685	// array of functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to
3686	// arrays and functions.
3687
3688	function_type_redeclarator:
3689	function_type_no_ptr attribute_list_opt
3690	{ $$ = $1->addQualifiers( $2 ); }
3691	\| function_type_ptr
3692	\| function_type_array attribute_list_opt
3693	{ $$ = $1->addQualifiers( $2 ); }
3694	;
3695
3696	function_type_no_ptr:
3697	paren_type '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3698	{ $$ = $1->addParamList( $3 ); }
3699	\| '(' function_type_ptr ')' '(' parameter_list_ellipsis_opt ')'
3700	{ $$ = $2->addParamList( $5 ); }
3701	\| '(' attribute_list function_type_ptr ')' '(' parameter_list_ellipsis_opt ')'
3702	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3703	\| '(' function_type_no_ptr ')' // redundant parenthesis
3704	{ $$ = $2; }
3705	\| '(' attribute_list function_type_no_ptr ')' // redundant parenthesis
3706	{ $$ = $3->addQualifiers( $2 ); }
3707	;
3708
3709	function_type_ptr:
3710	ptrref_operator function_type_redeclarator
3711	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3712	\| ptrref_operator type_qualifier_list function_type_redeclarator
3713	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3714	\| '(' function_type_ptr ')' attribute_list_opt
3715	{ $$ = $2->addQualifiers( $4 ); }
3716	\| '(' attribute_list function_type_ptr ')' attribute_list_opt
3717	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3718	;
3719
3720	function_type_array:
3721	'(' function_type_ptr ')' array_dimension
3722	{ $$ = $2->addArray( $4 ); }
3723	\| '(' attribute_list function_type_ptr ')' array_dimension
3724	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3725	\| '(' function_type_array ')' multi_array_dimension // redundant parenthesis
3726	{ $$ = $2->addArray( $4 ); }
3727	\| '(' attribute_list function_type_array ')' multi_array_dimension // redundant parenthesis
3728	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3729	\| '(' function_type_array ')' // redundant parenthesis
3730	{ $$ = $2; }
3731	\| '(' attribute_list function_type_array ')' // redundant parenthesis
3732	{ $$ = $3->addQualifiers( $2 ); }
3733	;
3734
3735	// This pattern parses a declaration for a parameter variable of a function prototype or actual that is not redefining a
3736	// typedef name and allows the C99 array options, which can only appear in a parameter list. The pattern precludes
3737	// declaring an array of functions versus a pointer to an array of functions, and returning arrays and functions versus
3738	// pointers to arrays and functions.
3739
3740	identifier_parameter_declarator:
3741	paren_identifier attribute_list_opt
3742	{ $$ = $1->addQualifiers( $2 ); }
3743	\| '&' MUTEX paren_identifier attribute_list_opt
3744	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( ast::CV::Mutex ),
3745	OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3746	\| identifier_parameter_ptr
3747	\| identifier_parameter_array attribute_list_opt
3748	{ $$ = $1->addQualifiers( $2 ); }
3749	\| identifier_parameter_function attribute_list_opt
3750	{ $$ = $1->addQualifiers( $2 ); }
3751	;
3752
3753	identifier_parameter_ptr:
3754	ptrref_operator identifier_parameter_declarator
3755	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3756	\| ptrref_operator type_qualifier_list identifier_parameter_declarator
3757	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3758	\| '(' identifier_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3759	{ $$ = $2->addQualifiers( $4 ); }
3760	;
3761
3762	identifier_parameter_array:
3763	paren_identifier array_parameter_dimension
3764	{ $$ = $1->addArray( $2 ); }
3765	\| '(' identifier_parameter_ptr ')' array_dimension
3766	{ $$ = $2->addArray( $4 ); }
3767	\| '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
3768	{ $$ = $2->addArray( $4 ); }
3769	\| '(' identifier_parameter_array ')' // redundant parenthesis
3770	{ $$ = $2; }
3771	;
3772
3773	identifier_parameter_function:
3774	paren_identifier '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3775	{ $$ = $1->addParamList( $3 ); }
3776	\| '(' identifier_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3777	{ $$ = $2->addParamList( $5 ); }
3778	\| '(' identifier_parameter_function ')' // redundant parenthesis
3779	{ $$ = $2; }
3780	;
3781
3782	// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
3783	// e.g.:
3784	//
3785	// typedef int foo;
3786	// forall( otype T ) struct foo;
3787	// int f( int foo ); // redefine typedef name in new scope
3788	//
3789	// and allows the C99 array options, which can only appear in a parameter list.
3790
3791	type_parameter_redeclarator:
3792	typedef_name attribute_list_opt
3793	{ $$ = $1->addQualifiers( $2 ); }
3794	\| '&' MUTEX typedef_name attribute_list_opt
3795	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( ast::CV::Mutex ),
3796	OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3797	\| type_parameter_ptr
3798	\| type_parameter_array attribute_list_opt
3799	{ $$ = $1->addQualifiers( $2 ); }
3800	\| type_parameter_function attribute_list_opt
3801	{ $$ = $1->addQualifiers( $2 ); }
3802	;
3803
3804	typedef_name:
3805	TYPEDEFname
3806	{ $$ = DeclarationNode::newName( $1 ); }
3807	\| TYPEGENname
3808	{ $$ = DeclarationNode::newName( $1 ); }
3809	;
3810
3811	type_parameter_ptr:
3812	ptrref_operator type_parameter_redeclarator
3813	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3814	\| ptrref_operator type_qualifier_list type_parameter_redeclarator
3815	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3816	\| '(' type_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3817	{ $$ = $2->addQualifiers( $4 ); }
3818	;
3819
3820	type_parameter_array:
3821	typedef_name array_parameter_dimension
3822	{ $$ = $1->addArray( $2 ); }
3823	\| '(' type_parameter_ptr ')' array_parameter_dimension
3824	{ $$ = $2->addArray( $4 ); }
3825	;
3826
3827	type_parameter_function:
3828	typedef_name '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3829	{ $$ = $1->addParamList( $3 ); }
3830	\| '(' type_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3831	{ $$ = $2->addParamList( $5 ); }
3832	;
3833
3834	// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
3835	// which the type applies, e.g.:
3836	//
3837	// sizeof( int );
3838	// sizeof( int * );
3839	// sizeof( int [10] );
3840	// sizeof( int (*)() );
3841	// sizeof( int () );
3842	//
3843	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3844	// and functions versus pointers to arrays and functions.
3845
3846	abstract_declarator:
3847	abstract_ptr
3848	\| abstract_array attribute_list_opt
3849	{ $$ = $1->addQualifiers( $2 ); }
3850	\| abstract_function attribute_list_opt
3851	{ $$ = $1->addQualifiers( $2 ); }
3852	;
3853
3854	abstract_ptr:
3855	ptrref_operator
3856	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
3857	\| ptrref_operator type_qualifier_list
3858	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3859	\| ptrref_operator abstract_declarator
3860	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3861	\| ptrref_operator type_qualifier_list abstract_declarator
3862	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3863	\| '(' abstract_ptr ')' attribute_list_opt
3864	{ $$ = $2->addQualifiers( $4 ); }
3865	;
3866
3867	abstract_array:
3868	array_dimension
3869	\| '(' abstract_ptr ')' array_dimension
3870	{ $$ = $2->addArray( $4 ); }
3871	\| '(' abstract_array ')' multi_array_dimension // redundant parenthesis
3872	{ $$ = $2->addArray( $4 ); }
3873	\| '(' abstract_array ')' // redundant parenthesis
3874	{ $$ = $2; }
3875	;
3876
3877	abstract_function:
3878	'(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3879	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $2, nullptr ); }
3880	\| '(' abstract_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3881	{ $$ = $2->addParamList( $5 ); }
3882	\| '(' abstract_function ')' // redundant parenthesis
3883	{ $$ = $2; }
3884	;
3885
3886	array_dimension:
3887	// Only the first dimension can be empty.
3888	'[' ']'
3889	{ $$ = DeclarationNode::newArray( nullptr, nullptr, false ); }
3890	\| '[' ']' multi_array_dimension
3891	{ $$ = DeclarationNode::newArray( nullptr, nullptr, false )->addArray( $3 ); }
3892	// Cannot use constant_expression because of tuples => semantic check
3893	\| '[' push assignment_expression pop ',' comma_expression ']' // CFA
3894	{ $$ = DeclarationNode::newArray( $3, nullptr, false )->addArray( DeclarationNode::newArray( $6, nullptr, false ) ); }
3895	// { SemanticError( yylloc, "New array dimension is currently unimplemented." ); $$ = nullptr; }
3896
3897	// If needed, the following parses and does not use comma_expression, so the array structure can be built.
3898	// \| '[' push assignment_expression pop ',' push array_dimension_list pop ']' // CFA
3899
3900	\| '[' push array_type_list pop ']' // CFA
3901	{ $$ = DeclarationNode::newArray( $3, nullptr, false ); }
3902	\| multi_array_dimension
3903	;
3904
3905	// array_dimension_list:
3906	// assignment_expression
3907	// \| array_dimension_list ',' assignment_expression
3908	// ;
3909
3910	array_type_list:
3911	basic_type_name
3912	{ $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3913	\| type_name
3914	{ $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3915	\| assignment_expression upupeq assignment_expression
3916	\| array_type_list ',' basic_type_name
3917	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) )); }
3918	\| array_type_list ',' type_name
3919	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) )); }
3920	\| array_type_list ',' assignment_expression upupeq assignment_expression
3921	;
3922
3923	upupeq:
3924	'~'
3925	{ $$ = OperKinds::LThan; }
3926	\| ErangeUpEq
3927	{ $$ = OperKinds::LEThan; }
3928	;
3929
3930	multi_array_dimension:
3931	'[' push assignment_expression pop ']'
3932	{ $$ = DeclarationNode::newArray( $3, nullptr, false ); }
3933	\| '[' push '*' pop ']' // C99
3934	{ $$ = DeclarationNode::newVarArray( 0 ); }
3935	\| multi_array_dimension '[' push assignment_expression pop ']'
3936	{ $$ = $1->addArray( DeclarationNode::newArray( $4, nullptr, false ) ); }
3937	\| multi_array_dimension '[' push '*' pop ']' // C99
3938	{ $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
3939	;
3940
3941	// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
3942	// identifier to which the type applies, e.g.:
3943	//
3944	// int f( int ); // not handled here
3945	// int f( int * ); // abstract function-prototype parameter; no parameter name specified
3946	// int f( int (*)() ); // abstract function-prototype parameter; no parameter name specified
3947	// int f( int (int) ); // abstract function-prototype parameter; no parameter name specified
3948	//
3949	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3950	// and functions versus pointers to arrays and functions. In addition, the pattern handles the
3951	// special meaning of parenthesis around a typedef name:
3952	//
3953	// ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
3954	// parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
3955	// not as redundant parentheses around the identifier."
3956	//
3957	// For example:
3958	//
3959	// typedef float T;
3960	// int f( int ( T [5] ) ); // see abstract_parameter_declarator
3961	// int g( int ( T ( int ) ) ); // see abstract_parameter_declarator
3962	// int f( int f1( T a[5] ) ); // see identifier_parameter_declarator
3963	// int g( int g1( T g2( int p ) ) ); // see identifier_parameter_declarator
3964	//
3965	// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
3966	// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
3967	// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
3968	// functions.
3969
3970	abstract_parameter_declarator_opt:
3971	// empty
3972	{ $$ = nullptr; }
3973	\| abstract_parameter_declarator
3974	;
3975
3976	abstract_parameter_declarator:
3977	abstract_parameter_ptr
3978	\| '&' MUTEX attribute_list_opt
3979	{ $$ = DeclarationNode::newPointer( DeclarationNode::newTypeQualifier( ast::CV::Mutex ), OperKinds::AddressOf )->addQualifiers( $3 ); }
3980	\| abstract_parameter_array attribute_list_opt
3981	{ $$ = $1->addQualifiers( $2 ); }
3982	\| abstract_parameter_function attribute_list_opt
3983	{ $$ = $1->addQualifiers( $2 ); }
3984	;
3985
3986	abstract_parameter_ptr:
3987	ptrref_operator
3988	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
3989	\| ptrref_operator type_qualifier_list
3990	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3991	\| ptrref_operator abstract_parameter_declarator
3992	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3993	\| ptrref_operator type_qualifier_list abstract_parameter_declarator
3994	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3995	\| '(' abstract_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3996	{ $$ = $2->addQualifiers( $4 ); }
3997	;
3998
3999	abstract_parameter_array:
4000	array_parameter_dimension
4001	\| '(' abstract_parameter_ptr ')' array_parameter_dimension
4002	{ $$ = $2->addArray( $4 ); }
4003	\| '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
4004	{ $$ = $2->addArray( $4 ); }
4005	\| '(' abstract_parameter_array ')' // redundant parenthesis
4006	{ $$ = $2; }
4007	;
4008
4009	abstract_parameter_function:
4010	'(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4011	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $2, nullptr ); }
4012	\| '(' abstract_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4013	{ $$ = $2->addParamList( $5 ); }
4014	\| '(' abstract_parameter_function ')' // redundant parenthesis
4015	{ $$ = $2; }
4016	;
4017
4018	array_parameter_dimension:
4019	// Only the first dimension can be empty or have qualifiers.
4020	array_parameter_1st_dimension
4021	\| array_parameter_1st_dimension multi_array_dimension
4022	{ $$ = $1->addArray( $2 ); }
4023	\| multi_array_dimension
4024	;
4025
4026	// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
4027	//
4028	// ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
4029	// a declaration of a function parameter with an array type, and then only in the outermost array type derivation."
4030
4031	array_parameter_1st_dimension:
4032	'[' ']'
4033	{ $$ = DeclarationNode::newArray( nullptr, nullptr, false ); }
4034	// multi_array_dimension handles the '[' '*' ']' case
4035	\| '[' push type_qualifier_list '*' pop ']' // remaining C99
4036	{ $$ = DeclarationNode::newVarArray( $3 ); }
4037	\| '[' push type_qualifier_list pop ']'
4038	{ $$ = DeclarationNode::newArray( nullptr, $3, false ); }
4039	// multi_array_dimension handles the '[' assignment_expression ']' case
4040	\| '[' push type_qualifier_list assignment_expression pop ']'
4041	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
4042	\| '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
4043	{ $$ = DeclarationNode::newArray( $5, $4, true ); }
4044	\| '[' push type_qualifier_list STATIC assignment_expression pop ']'
4045	{ $$ = DeclarationNode::newArray( $5, $3, true ); }
4046	;
4047
4048	// This pattern parses a declaration of an abstract variable, but does not allow "int ()" for a function pointer.
4049	//
4050	// struct S {
4051	// int;
4052	// int *;
4053	// int [10];
4054	// int (*)();
4055	// };
4056
4057	variable_abstract_declarator:
4058	variable_abstract_ptr
4059	\| variable_abstract_array attribute_list_opt
4060	{ $$ = $1->addQualifiers( $2 ); }
4061	\| variable_abstract_function attribute_list_opt
4062	{ $$ = $1->addQualifiers( $2 ); }
4063	;
4064
4065	variable_abstract_ptr:
4066	ptrref_operator
4067	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
4068	\| ptrref_operator type_qualifier_list
4069	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
4070	\| ptrref_operator variable_abstract_declarator
4071	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4072	\| ptrref_operator type_qualifier_list variable_abstract_declarator
4073	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
4074	\| '(' variable_abstract_ptr ')' attribute_list_opt // redundant parenthesis
4075	{ $$ = $2->addQualifiers( $4 ); }
4076	;
4077
4078	variable_abstract_array:
4079	array_dimension
4080	\| '(' variable_abstract_ptr ')' array_dimension
4081	{ $$ = $2->addArray( $4 ); }
4082	\| '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
4083	{ $$ = $2->addArray( $4 ); }
4084	\| '(' variable_abstract_array ')' // redundant parenthesis
4085	{ $$ = $2; }
4086	;
4087
4088	variable_abstract_function:
4089	'(' variable_abstract_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4090	{ $$ = $2->addParamList( $5 ); }
4091	\| '(' variable_abstract_function ')' // redundant parenthesis
4092	{ $$ = $2; }
4093	;
4094
4095	// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
4096	// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.
4097
4098	cfa_identifier_parameter_declarator_tuple: // CFA
4099	cfa_identifier_parameter_declarator_no_tuple
4100	\| cfa_abstract_tuple
4101	\| type_qualifier_list cfa_abstract_tuple
4102	{ $$ = $2->addQualifiers( $1 ); }
4103	;
4104
4105	cfa_identifier_parameter_declarator_no_tuple: // CFA
4106	cfa_identifier_parameter_ptr
4107	\| cfa_identifier_parameter_array
4108	;
4109
4110	cfa_identifier_parameter_ptr: // CFA
4111	// No SUE declaration in parameter list.
4112	ptrref_operator type_specifier_nobody
4113	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4114	\| type_qualifier_list ptrref_operator type_specifier_nobody
4115	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4116	\| ptrref_operator cfa_abstract_function
4117	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4118	\| type_qualifier_list ptrref_operator cfa_abstract_function
4119	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4120	\| ptrref_operator cfa_identifier_parameter_declarator_tuple
4121	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4122	\| type_qualifier_list ptrref_operator cfa_identifier_parameter_declarator_tuple
4123	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4124	;
4125
4126	cfa_identifier_parameter_array: // CFA
4127	// Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
4128	// shift/reduce conflict with new-style empty (void) function return type.
4129	'[' ']' type_specifier_nobody
4130	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4131	\| cfa_array_parameter_1st_dimension type_specifier_nobody
4132	{ $$ = $2->addNewArray( $1 ); }
4133	\| '[' ']' multi_array_dimension type_specifier_nobody
4134	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4135	\| cfa_array_parameter_1st_dimension multi_array_dimension type_specifier_nobody
4136	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
4137	\| multi_array_dimension type_specifier_nobody
4138	{ $$ = $2->addNewArray( $1 ); }
4139
4140	\| '[' ']' cfa_identifier_parameter_ptr
4141	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4142	\| cfa_array_parameter_1st_dimension cfa_identifier_parameter_ptr
4143	{ $$ = $2->addNewArray( $1 ); }
4144	\| '[' ']' multi_array_dimension cfa_identifier_parameter_ptr
4145	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4146	\| cfa_array_parameter_1st_dimension multi_array_dimension cfa_identifier_parameter_ptr
4147	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
4148	\| multi_array_dimension cfa_identifier_parameter_ptr
4149	{ $$ = $2->addNewArray( $1 ); }
4150	;
4151
4152	cfa_array_parameter_1st_dimension:
4153	'[' push type_qualifier_list '*' pop ']' // remaining C99
4154	{ $$ = DeclarationNode::newVarArray( $3 ); }
4155	\| '[' push type_qualifier_list assignment_expression pop ']'
4156	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
4157	\| '[' push declaration_qualifier_list assignment_expression pop ']'
4158	// declaration_qualifier_list must be used because of shift/reduce conflict with
4159	// assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
4160	// appear in this context.
4161	{ $$ = DeclarationNode::newArray( $4, $3, true ); }
4162	\| '[' push declaration_qualifier_list type_qualifier_list assignment_expression pop ']'
4163	{ $$ = DeclarationNode::newArray( $5, $4->addQualifiers( $3 ), true ); }
4164	;
4165
4166	// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
4167	// identifier to which the type applies, e.g.:
4168	//
4169	// [int] f( int ); // abstract variable parameter; no parameter name specified
4170	// [int] f( [int] (int) ); // abstract function-prototype parameter; no parameter name specified
4171	//
4172	// These rules need LR(3):
4173	//
4174	// cfa_abstract_tuple identifier_or_type_name
4175	// '[' cfa_parameter_list ']' identifier_or_type_name '(' cfa_parameter_list_ellipsis_opt ')'
4176	//
4177	// since a function return type can be syntactically identical to a tuple type:
4178	//
4179	// [int, int] t;
4180	// [int, int] f( int );
4181	//
4182	// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
4183	// cfa_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
4184	// lookahead. To accomplish this, cfa_abstract_declarator has an entry point without tuple, and tuple declarations are
4185	// duplicated when appearing with cfa_function_specifier.
4186
4187	cfa_abstract_declarator_tuple: // CFA
4188	cfa_abstract_tuple
4189	\| type_qualifier_list cfa_abstract_tuple
4190	{ $$ = $2->addQualifiers( $1 ); }
4191	\| cfa_abstract_declarator_no_tuple
4192	;
4193
4194	cfa_abstract_declarator_no_tuple: // CFA
4195	cfa_abstract_ptr
4196	\| cfa_abstract_array
4197	;
4198
4199	cfa_abstract_ptr: // CFA
4200	ptrref_operator type_specifier
4201	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4202	\| type_qualifier_list ptrref_operator type_specifier
4203	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4204	\| ptrref_operator cfa_abstract_function
4205	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4206	\| type_qualifier_list ptrref_operator cfa_abstract_function
4207	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4208	\| ptrref_operator cfa_abstract_declarator_tuple
4209	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4210	\| type_qualifier_list ptrref_operator cfa_abstract_declarator_tuple
4211	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4212	;
4213
4214	cfa_abstract_array: // CFA
4215	// Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
4216	// empty (void) function return type.
4217	'[' ']' type_specifier
4218	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4219	\| '[' ']' multi_array_dimension type_specifier
4220	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4221	\| multi_array_dimension type_specifier
4222	{ $$ = $2->addNewArray( $1 ); }
4223	\| '[' ']' cfa_abstract_ptr
4224	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4225	\| '[' ']' multi_array_dimension cfa_abstract_ptr
4226	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4227	\| multi_array_dimension cfa_abstract_ptr
4228	{ $$ = $2->addNewArray( $1 ); }
4229	;
4230
4231	cfa_abstract_tuple: // CFA
4232	'[' push cfa_abstract_parameter_list pop ']'
4233	{ $$ = DeclarationNode::newTuple( $3 ); }
4234	\| '[' push type_specifier_nobody ELLIPSIS pop ']'
4235	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
4236	\| '[' push type_specifier_nobody ELLIPSIS constant_expression pop ']'
4237	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
4238	;
4239
4240	cfa_abstract_function: // CFA
4241	'[' ']' '(' cfa_parameter_list_ellipsis_opt ')'
4242	{ $$ = DeclarationNode::newFunction( nullptr, DeclarationNode::newTuple( nullptr ), $4, nullptr ); }
4243	\| cfa_abstract_tuple '(' push cfa_parameter_list_ellipsis_opt pop ')'
4244	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
4245	\| cfa_function_return '(' push cfa_parameter_list_ellipsis_opt pop ')'
4246	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
4247	;
4248
4249	// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
4250	// each declaration, and in the specifier-qualifier list in each structure declaration and type name."
4251	//
4252	// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
4253	// the declaration specifiers in a declaration is an obsolescent feature."
4254	//
4255	// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
4256	// prototype-format parameter type declarators) is an obsolescent feature."
4257	//
4258	// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
4259	// declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.
4260
4261	// ********************** MISCELLANEOUS ******************************
4262
4263	comma_opt: // redundant comma
4264	// empty
4265	\| ','
4266	;
4267
4268	default_initializer_opt:
4269	// empty
4270	{ $$ = nullptr; }
4271	\| '=' assignment_expression
4272	{ $$ = $2; }
4273	;
4274
4275	%%
4276
4277	// ----end of grammar----
4278
4279	// Local Variables: //
4280	// mode: c++ //
4281	// tab-width: 4 //
4282	// compile-command: "make install" //
4283	// End: //

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