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parser.yy @ e72fc60

Last change on this file since e72fc60 was 6cef439, checked in by Andrew Beach <ajbeach@…>, 7 months ago
Return 'TypeData? *' from some parse rules. Moved TypeData? construction over to that file.
Property mode set to `100644`
File size: 177.9 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 : Wed Mar 6 10:51:55 2024
13	// Update Count : 6588
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	// A raw token can be used.
320	Token tok;
321
322	// The general node types hold some generic node or list of nodes.
323	DeclarationNode * decl;
324	InitializerNode * init;
325	ExpressionNode * expr;
326	StatementNode * stmt;
327	ClauseNode * clause;
328	TypeData * type;
329
330	// Special "nodes" containing compound information.
331	CondCtl * ifctl;
332	ForCtrl * forctl;
333	LabelNode * labels;
334
335	// Various flags and single values that become fields later.
336	ast::AggregateDecl::Aggregate aggKey;
337	ast::TypeDecl::Kind tclass;
338	OperKinds oper;
339	bool is_volatile;
340	EnumHiding enum_hiding;
341	ast::ExceptionKind except_kind;
342	// String passes ownership with it.
343	std::string * str;
344
345	// Narrower node types are used to avoid constant unwrapping.
346	ast::WaitForStmt * wfs;
347	ast::WaitUntilStmt::ClauseNode * wucn;
348	ast::GenericExpr * genexpr;
349	}
350
351	// ********************** TERMINAL TOKENS ******************************
352
353	// keywords
354	%token TYPEDEF
355	%token EXTERN STATIC AUTO REGISTER
356	%token THREADLOCALGCC THREADLOCALC11 // GCC, C11
357	%token INLINE FORTRAN // C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
358	%token NORETURN // C11
359	%token CONST VOLATILE
360	%token RESTRICT // C99
361	%token ATOMIC // C11
362	%token FORALL MUTEX VIRTUAL VTABLE COERCE // CFA
363	%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED
364	%token BOOL COMPLEX IMAGINARY // C99
365	%token INT128 UINT128 uuFLOAT80 uuFLOAT128 // GCC
366	%token uFLOAT16 uFLOAT32 uFLOAT32X uFLOAT64 uFLOAT64X uFLOAT128 // GCC
367	%token DECIMAL32 DECIMAL64 DECIMAL128 // GCC
368	%token ZERO_T ONE_T // CFA
369	%token SIZEOF TYPEOF VA_LIST VA_ARG AUTO_TYPE // GCC
370	%token OFFSETOF BASETYPEOF TYPEID // CFA
371	%token ENUM STRUCT UNION
372	%token EXCEPTION // CFA
373	%token GENERATOR COROUTINE MONITOR THREAD // CFA
374	%token OTYPE FTYPE DTYPE TTYPE TRAIT // CFA
375	// %token RESUME // CFA
376	%token LABEL // GCC
377	%token SUSPEND // CFA
378	%token ATTRIBUTE EXTENSION // GCC
379	%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
380	%token CHOOSE FALLTHRU FALLTHROUGH WITH WHEN WAITFOR WAITUNTIL // CFA
381	%token CORUN COFOR
382	%token DISABLE ENABLE TRY THROW THROWRESUME AT // CFA
383	%token ASM // C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
384	%token ALIGNAS ALIGNOF GENERIC STATICASSERT // C11
385
386	// names and constants: lexer differentiates between identifier and typedef names
387	%token<tok> IDENTIFIER TYPEDIMname TYPEDEFname TYPEGENname
388	%token<tok> TIMEOUT WAND WOR CATCH RECOVER CATCHRESUME FIXUP FINALLY // CFA
389	%token<tok> INTEGERconstant CHARACTERconstant STRINGliteral
390	%token<tok> DIRECTIVE
391	// Floating point constant is broken into three kinds of tokens because of the ambiguity with tuple indexing and
392	// overloading constants 0/1, e.g., x.1 is lexed as (x)(.1), where (.1) is a factional constant, but is semantically
393	// converted into the tuple index (.)(1). e.g., 3.x
394	%token<tok> FLOATING_DECIMALconstant FLOATING_FRACTIONconstant FLOATINGconstant
395
396	// multi-character operators
397	%token ARROW // ->
398	%token ICR DECR // ++ --
399	%token LS RS // << >>
400	%token LE GE EQ NE // <= >= == !=
401	%token ANDAND OROR // && \|\|
402	%token ATTR ELLIPSIS // @@ ...
403
404	%token EXPassign MULTassign DIVassign MODassign // \= *= /= %=
405	%token PLUSassign MINUSassign // += -=
406	%token LSassign RSassign // <<= >>=
407	%token ANDassign ERassign ORassign // &= ^= \|=
408
409	%token ErangeUpEq ErangeDown ErangeDownEq // ~= -~ -~=
410	%token ATassign // @=
411
412	%type<tok> identifier identifier_at identifier_or_type_name attr_name
413	%type<tok> quasi_keyword
414	%type<expr> string_literal
415	%type<str> string_literal_list
416
417	%type<enum_hiding> hide_opt visible_hide_opt
418
419	// expressions
420	%type<expr> constant
421	%type<expr> tuple tuple_expression_list
422	%type<oper> ptrref_operator unary_operator assignment_operator simple_assignment_operator compound_assignment_operator
423	%type<expr> primary_expression postfix_expression unary_expression
424	%type<expr> cast_expression_list cast_expression exponential_expression multiplicative_expression additive_expression
425	%type<expr> shift_expression relational_expression equality_expression
426	%type<expr> AND_expression exclusive_OR_expression inclusive_OR_expression
427	%type<expr> logical_AND_expression logical_OR_expression
428	%type<expr> conditional_expression constant_expression assignment_expression assignment_expression_opt
429	%type<expr> comma_expression comma_expression_opt
430	%type<expr> argument_expression_list_opt argument_expression_list argument_expression default_initializer_opt
431	%type<ifctl> conditional_declaration
432	%type<forctl> for_control_expression for_control_expression_list
433	%type<oper> upupeq updown updowneq downupdowneq
434	%type<expr> subrange
435	%type<decl> asm_name_opt
436	%type<expr> asm_operands_opt asm_operands_list asm_operand
437	%type<labels> label_list
438	%type<expr> asm_clobbers_list_opt
439	%type<is_volatile> asm_volatile_opt
440	%type<expr> handler_predicate_opt
441	%type<genexpr> generic_association generic_assoc_list
442
443	// statements
444	%type<stmt> statement labeled_statement compound_statement
445	%type<stmt> statement_decl statement_decl_list statement_list_nodecl
446	%type<stmt> selection_statement
447	%type<clause> switch_clause_list_opt switch_clause_list
448	%type<expr> case_value
449	%type<clause> case_clause case_value_list case_label case_label_list
450	%type<stmt> iteration_statement jump_statement
451	%type<stmt> expression_statement asm_statement
452	%type<stmt> with_statement
453	%type<expr> with_clause_opt
454	%type<stmt> corun_statement cofor_statement
455	%type<stmt> exception_statement
456	%type<clause> handler_clause finally_clause
457	%type<except_kind> handler_key
458	%type<stmt> mutex_statement
459	%type<expr> when_clause when_clause_opt waitfor waituntil timeout
460	%type<stmt> waitfor_statement waituntil_statement
461	%type<wfs> wor_waitfor_clause
462	%type<wucn> waituntil_clause wand_waituntil_clause wor_waituntil_clause
463
464	// declarations
465	%type<decl> abstract_declarator abstract_ptr abstract_array abstract_function array_dimension multi_array_dimension
466	%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
467	%type<decl> abstract_parameter_declaration
468
469	%type<aggKey> aggregate_key aggregate_data aggregate_control
470	%type<decl> aggregate_type aggregate_type_nobody
471
472	%type<decl> assertion assertion_list assertion_list_opt
473
474	%type<expr> bit_subrange_size_opt bit_subrange_size
475
476	%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type indirect_type
477	%type<type> basic_type_name_type
478	%type<type> vtable vtable_opt default_opt
479
480	%type<decl> trait_declaration trait_declaration_list trait_declaring_list trait_specifier
481
482	%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
483	%type<decl> declaration_specifier declaration_specifier_nobody declarator declaring_list
484
485	%type<decl> elaborated_type elaborated_type_nobody
486
487	%type<decl> enumerator_list enum_type enum_type_nobody
488	%type<init> enumerator_value_opt
489
490	%type<decl> external_definition external_definition_list external_definition_list_opt
491
492	%type<decl> exception_declaration
493
494	%type<decl> field_declaration_list_opt field_declaration field_declaring_list_opt field_declarator field_abstract_list_opt field_abstract
495	%type<expr> field field_name_list field_name fraction_constants_opt
496
497	%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr
498
499	%type<decl> identifier_parameter_declarator identifier_parameter_ptr identifier_parameter_array identifier_parameter_function
500	%type<decl> identifier_list
501
502	%type<decl> cfa_abstract_array cfa_abstract_declarator_no_tuple cfa_abstract_declarator_tuple
503	%type<decl> cfa_abstract_function cfa_abstract_parameter_declaration cfa_abstract_parameter_list
504	%type<decl> cfa_abstract_ptr cfa_abstract_tuple
505
506	%type<decl> cfa_array_parameter_1st_dimension
507
508	%type<decl> cfa_trait_declaring_list cfa_declaration cfa_field_declaring_list cfa_field_abstract_list
509	%type<decl> cfa_function_declaration cfa_function_return cfa_function_specifier
510
511	%type<decl> cfa_identifier_parameter_array cfa_identifier_parameter_declarator_no_tuple
512	%type<decl> cfa_identifier_parameter_declarator_tuple cfa_identifier_parameter_ptr
513
514	%type<decl> cfa_parameter_declaration cfa_parameter_list cfa_parameter_list_ellipsis_opt
515
516	%type<decl> cfa_typedef_declaration cfa_variable_declaration cfa_variable_specifier
517
518	%type<decl> c_declaration static_assert
519	%type<decl> KR_function_declarator KR_function_no_ptr KR_function_ptr KR_function_array
520	%type<decl> KR_parameter_list KR_parameter_list_opt
521
522	%type<decl> parameter_declaration parameter_list parameter_list_ellipsis_opt
523
524	%type<decl> paren_identifier paren_type
525
526	%type<decl> storage_class storage_class_list
527
528	%type<decl> sue_declaration_specifier sue_declaration_specifier_nobody sue_type_specifier sue_type_specifier_nobody
529
530	%type<tclass> type_class new_type_class
531	%type<decl> type_declarator type_declarator_name type_declaring_list
532
533	%type<decl> type_declaration_specifier type_type_specifier
534	%type<type> type_name typegen_name
535	%type<decl> typedef_name typedef_declaration typedef_expression
536
537	%type<decl> variable_type_redeclarator variable_type_ptr variable_type_array variable_type_function
538	%type<decl> general_function_declarator function_type_redeclarator function_type_array function_type_no_ptr function_type_ptr
539
540	%type<decl> type_parameter_redeclarator type_parameter_ptr type_parameter_array type_parameter_function
541
542	%type<decl> type type_no_function
543	%type<decl> type_parameter type_parameter_list type_initializer_opt
544
545	%type<expr> type_parameters_opt type_list array_type_list // array_dimension_list
546
547	%type<decl> type_qualifier forall type_qualifier_list_opt type_qualifier_list
548	%type<type> type_qualifier_name
549	%type<decl> type_specifier type_specifier_nobody
550
551	%type<decl> variable_declarator variable_ptr variable_array variable_function
552	%type<decl> variable_abstract_declarator variable_abstract_ptr variable_abstract_array variable_abstract_function
553
554	%type<decl> attribute_list_opt attribute_list attribute attribute_name_list attribute_name
555
556	// initializers
557	%type<init> initializer initializer_list_opt initializer_opt
558
559	// designators
560	%type<expr> designator designator_list designation
561
562
563	// Handle shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string is ambiguous:
564	// .---------. matches IF '(' comma_expression ')' statement . (reduce)
565	// if ( C ) S1 else S2
566	// `-----------------' matches IF '(' comma_expression ')' statement . (shift) ELSE statement */
567	// Similar issues exit with the waitfor statement.
568
569	// Order of these lines matters (low-to-high precedence). THEN is left associative over WAND/WOR/TIMEOUT/ELSE, WAND/WOR
570	// is left associative over TIMEOUT/ELSE, and TIMEOUT is left associative over ELSE.
571	%precedence THEN // rule precedence for IF/WAITFOR statement
572	%precedence ANDAND // token precedence for start of WAND in WAITFOR statement
573	%precedence WAND // token precedence for start of WAND in WAITFOR statement
574	%precedence OROR // token precedence for start of WOR in WAITFOR statement
575	%precedence WOR // token precedence for start of WOR in WAITFOR statement
576	%precedence TIMEOUT // token precedence for start of TIMEOUT in WAITFOR statement
577	%precedence CATCH // token precedence for start of TIMEOUT in WAITFOR statement
578	%precedence RECOVER // token precedence for start of TIMEOUT in WAITFOR statement
579	%precedence CATCHRESUME // token precedence for start of TIMEOUT in WAITFOR statement
580	%precedence FIXUP // token precedence for start of TIMEOUT in WAITFOR statement
581	%precedence FINALLY // token precedence for start of TIMEOUT in WAITFOR statement
582	%precedence ELSE // token precedence for start of else clause in IF/WAITFOR statement
583
584
585	// Handle shift/reduce conflict for generic type by shifting the '(' token. For example, this string is ambiguous:
586	// forall( otype T ) struct Foo { T v; };
587	// .-----. matches pointer to function returning a generic (which is impossible without a type)
588	// Foo ( *fp )( int );
589	// `---' matches start of TYPEGENname '('
590	// must be:
591	// Foo( int ) ( *fp )( int );
592	// The same problem occurs here:
593	// forall( otype T ) struct Foo { T v; } ( *fp )( int );
594	// must be:
595	// forall( otype T ) struct Foo { T v; } ( int ) ( *fp )( int );
596
597	// Order of these lines matters (low-to-high precedence).
598	%precedence TYPEGENname
599	%precedence '}'
600	%precedence '('
601
602	// %precedence RESUME
603	// %precedence '{'
604	// %precedence ')'
605
606	%locations // support location tracking for error messages
607
608	%start translation_unit // parse-tree root
609
610	%%
611	// ********************** Namespace Management ******************************
612
613	// The C grammar is not context free because it relies on the distinct terminal symbols "identifier" and "TYPEDEFname",
614	// which are lexically identical.
615	//
616	// typedef int foo; // identifier foo must now be scanned as TYPEDEFname
617	// foo f; // to allow it to appear in this context
618	//
619	// While it may be possible to write a purely context-free grammar, such a grammar would obscure the relationship
620	// between syntactic and semantic constructs. Cforall compounds this problem by introducing type names local to the
621	// scope of a declaration (for instance, those introduced through "forall" qualifiers), and by introducing "type
622	// generators" -- parameterized types. This latter type name creates a third class of identifiers, "TYPEGENname", which
623	// must be distinguished by the lexical scanner.
624	//
625	// Since the scanner cannot distinguish among the different classes of identifiers without some context information,
626	// there is a type table (typedefTable), which holds type names and identifiers that override type names, for each named
627	// scope. During parsing, semantic actions update the type table by adding new identifiers in the current scope. For
628	// each context that introduces a name scope, a new level is created in the type table and that level is popped on
629	// exiting the scope. Since type names can be local to a particular declaration, each declaration is itself a scope.
630	// This requires distinguishing between type names that are local to the current declaration scope and those that
631	// persist past the end of the declaration (i.e., names defined in "typedef" or "otype" declarations).
632	//
633	// The non-terminals "push" and "pop" denote the opening and closing of named scopes. Every push has a matching pop in
634	// the production rule. There are multiple lists of declarations, where each declaration is a named scope, so pop/push
635	// around the list separator.
636	//
637	// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
638	// push pop push pop
639
640	push:
641	{ typedefTable.enterScope(); }
642	;
643
644	pop:
645	{ typedefTable.leaveScope(); }
646	;
647
648	// ********************** CONSTANTS ******************************
649
650	constant:
651	// ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
652	INTEGERconstant { $$ = new ExpressionNode( build_constantInteger( yylloc, *$1 ) ); }
653	\| FLOATING_DECIMALconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
654	\| FLOATING_FRACTIONconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
655	\| FLOATINGconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
656	\| CHARACTERconstant { $$ = new ExpressionNode( build_constantChar( yylloc, *$1 ) ); }
657	;
658
659	quasi_keyword: // CFA
660	TIMEOUT
661	\| WAND
662	\| WOR
663	\| CATCH
664	\| RECOVER
665	\| CATCHRESUME
666	\| FIXUP
667	\| FINALLY
668	;
669
670	identifier:
671	IDENTIFIER
672	\| quasi_keyword
673	;
674
675	identifier_at:
676	identifier
677	\| '@' // CFA
678	{ Token tok = { new string( DeclarationNode::anonymous.newName() ), yylval.tok.loc }; $$ = tok; }
679	;
680
681	string_literal:
682	string_literal_list { $$ = new ExpressionNode( build_constantStr( yylloc, *$1 ) ); }
683	;
684
685	string_literal_list: // juxtaposed strings are concatenated
686	STRINGliteral { $$ = $1; } // conversion from tok to str
687	\| string_literal_list STRINGliteral
688	{
689	if ( ! appendStr( $1, $2 ) ) YYERROR; // append 2nd juxtaposed string to 1st
690	delete $2; // allocated by lexer
691	$$ = $1; // conversion from tok to str
692	}
693	;
694
695	// ********************** EXPRESSIONS ******************************
696
697	primary_expression:
698	IDENTIFIER // typedef name cannot be used as a variable name
699	{ $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
700	\| quasi_keyword
701	{ $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
702	\| TYPEDIMname // CFA, generic length argument
703	{ $$ = new ExpressionNode( build_dimensionref( yylloc, $1 ) ); }
704	\| tuple
705	\| '(' comma_expression ')'
706	{ $$ = $2; }
707	\| '(' compound_statement ')' // GCC, lambda expression
708	{ $$ = new ExpressionNode( new ast::StmtExpr( yylloc, dynamic_cast<ast::CompoundStmt *>( maybeMoveBuild( $2 ) ) ) ); }
709	\| type_name '.' identifier // CFA, nested type
710	{ $$ = new ExpressionNode( build_qualified_expr( yylloc, DeclarationNode::newFromTypeData( $1 ), build_varref( yylloc, $3 ) ) ); }
711	\| type_name '.' '[' field_name_list ']' // CFA, nested type / tuple field selector
712	{ SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
713	\| GENERIC '(' assignment_expression ',' generic_assoc_list ')' // C11
714	{
715	// add the missing control expression to the GenericExpr and return it
716	$5->control = maybeMoveBuild( $3 );
717	$$ = new ExpressionNode( $5 );
718	}
719	// \| RESUME '(' comma_expression ')'
720	// { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
721	// \| RESUME '(' comma_expression ')' compound_statement
722	// { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
723	\| IDENTIFIER IDENTIFIER // invalid syntax rule
724	{ IdentifierBeforeIdentifier( $1.str, $2.str, "expression" ); $$ = nullptr; }
725	\| IDENTIFIER type_qualifier // invalid syntax rule
726	{ IdentifierBeforeType( *$1.str, "type qualifier" ); $$ = nullptr; }
727	\| IDENTIFIER storage_class // invalid syntax rule
728	{ IdentifierBeforeType( *$1.str, "storage class" ); $$ = nullptr; }
729	\| IDENTIFIER basic_type_name // invalid syntax rule
730	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
731	\| IDENTIFIER TYPEDEFname // invalid syntax rule
732	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
733	\| IDENTIFIER TYPEGENname // invalid syntax rule
734	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
735	;
736
737	generic_assoc_list: // C11
738	generic_association
739	\| generic_assoc_list ',' generic_association
740	{
741	// steal the association node from the singleton and delete the wrapper
742	assert( 1 == $3->associations.size() );
743	$1->associations.push_back( $3->associations.front() );
744	delete $3;
745	$$ = $1;
746	}
747	;
748
749	generic_association: // C11
750	type_no_function ':' assignment_expression
751	{
752	// create a GenericExpr wrapper with one association pair
753	$$ = new ast::GenericExpr( yylloc, nullptr, { { maybeMoveBuildType( $1 ), maybeMoveBuild( $3 ) } } );
754	}
755	\| DEFAULT ':' assignment_expression
756	{ $$ = new ast::GenericExpr( yylloc, nullptr, { { maybeMoveBuild( $3 ) } } ); }
757	;
758
759	postfix_expression:
760	primary_expression
761	\| postfix_expression '[' assignment_expression ',' tuple_expression_list ']'
762	// Historic, transitional: Disallow commas in subscripts.
763	// Switching to this behaviour may help check if a C compatibilty case uses comma-exprs in subscripts.
764	// Current: Commas in subscripts make tuples.
765	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, new ExpressionNode( build_tuple( yylloc, (ExpressionNode *)($3->set_last( $5 ) ) )) ) ); }
766	\| postfix_expression '[' assignment_expression ']'
767	// CFA, comma_expression disallowed in this context because it results in a common user error: subscripting a
768	// matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
769	// little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
770	// equivalent to the old x[i,j].
771	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
772	\| constant '[' assignment_expression ']' // 3[a], 'a'[a], 3.5[a]
773	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
774	\| string_literal '[' assignment_expression ']' // "abc"[3], 3["abc"]
775	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
776	\| postfix_expression '{' argument_expression_list_opt '}' // CFA, constructor call
777	{
778	Token fn;
779	fn.str = new std::string( "?{}" ); // location undefined - use location of '{'?
780	$$ = new ExpressionNode( new ast::ConstructorExpr( yylloc, build_func( yylloc, new ExpressionNode( build_varref( yylloc, fn ) ), (ExpressionNode *)( $1 )->set_last( $3 ) ) ) );
781	}
782	\| postfix_expression '(' argument_expression_list_opt ')'
783	{ $$ = new ExpressionNode( build_func( yylloc, $1, $3 ) ); }
784	\| VA_ARG '(' primary_expression ',' declaration_specifier_nobody abstract_parameter_declarator_opt ')'
785	// { SemanticError( yylloc, "va_arg is currently unimplemented." ); $$ = nullptr; }
786	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, new string( "__builtin_va_arg") ) ),
787	(ExpressionNode )($3->set_last( (ExpressionNode )($6 ? $6->addType( $5 ) : $5) )) ) ); }
788	\| postfix_expression '`' identifier // CFA, postfix call
789	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
790	\| constant '`' identifier // CFA, postfix call
791	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
792	\| string_literal '`' identifier // CFA, postfix call
793	{ $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
794
795	// SKULLDUGGERY: The typedef table used for parsing does not store fields in structures. To parse a qualified
796	// name, it is assumed all name-tokens after the first are identifiers, regardless of how the lexer identifies
797	// them. For example:
798	//
799	// struct S;
800	// forall(T) struct T;
801	// union U;
802	// enum E { S, T, E };
803	// struct Z { int S, T, Z, E, U; };
804	// void fred () {
805	// Z z;
806	// z.S; // lexer returns S is TYPEDEFname
807	// z.T; // lexer returns T is TYPEGENname
808	// z.Z; // lexer returns Z is TYPEDEFname
809	// z.U; // lexer returns U is TYPEDEFname
810	// z.E; // lexer returns E is TYPEDEFname
811	// }
812	\| postfix_expression '.' identifier
813	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
814	\| postfix_expression '.' TYPEDEFname // CFA, SKULLDUGGERY
815	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
816	\| postfix_expression '.' TYPEGENname // CFA, SKULLDUGGERY
817	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
818
819	\| postfix_expression '.' INTEGERconstant // CFA, tuple index
820	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_constantInteger( yylloc, *$3 ) ) ); }
821	\| postfix_expression FLOATING_FRACTIONconstant // CFA, tuple index
822	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_field_name_FLOATING_FRACTIONconstant( yylloc, *$2 ) ) ); }
823	\| postfix_expression '.' '[' field_name_list ']' // CFA, tuple field selector
824	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
825	\| postfix_expression '.' aggregate_control
826	{ $$ = new ExpressionNode( build_keyword_cast( yylloc, $3, $1 ) ); }
827	\| postfix_expression ARROW identifier
828	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
829	\| postfix_expression ARROW INTEGERconstant // CFA, tuple index
830	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_constantInteger( yylloc, *$3 ) ) ); }
831	\| postfix_expression ARROW '[' field_name_list ']' // CFA, tuple field selector
832	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
833	\| postfix_expression ICR
834	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::IncrPost, $1 ) ); }
835	\| postfix_expression DECR
836	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::DecrPost, $1 ) ); }
837	\| '(' type_no_function ')' '{' initializer_list_opt comma_opt '}' // C99, compound-literal
838	{ $$ = new ExpressionNode( build_compoundLiteral( yylloc, $2, new InitializerNode( $5, true ) ) ); }
839	\| '(' type_no_function ')' '@' '{' initializer_list_opt comma_opt '}' // CFA, explicit C compound-literal
840	{ $$ = new ExpressionNode( build_compoundLiteral( yylloc, $2, (new InitializerNode( $6, true ))->set_maybeConstructed( false ) ) ); }
841	\| '^' primary_expression '{' argument_expression_list_opt '}' // CFA, destructor call
842	{
843	Token fn;
844	fn.str = new string( "^?{}" ); // location undefined
845	$$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, fn ) ), (ExpressionNode *)( $2 )->set_last( $4 ) ) );
846	}
847	;
848
849	argument_expression_list_opt:
850	// empty
851	{ $$ = nullptr; }
852	\| argument_expression_list
853	;
854
855	argument_expression_list:
856	argument_expression
857	\| argument_expression_list_opt ',' argument_expression
858	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
859	;
860
861	argument_expression:
862	'@' // CFA, default parameter
863	{ SemanticError( yylloc, "Default parameter for argument is currently unimplemented." ); $$ = nullptr; }
864	// { $$ = new ExpressionNode( build_constantInteger( *new string( "2" ) ) ); }
865	\| assignment_expression
866	;
867
868	field_name_list: // CFA, tuple field selector
869	field
870	\| field_name_list ',' field { $$ = (ExpressionNode *)($1->set_last( $3 )); }
871	;
872
873	field: // CFA, tuple field selector
874	field_name
875	\| FLOATING_DECIMALconstant field
876	{ $$ = new ExpressionNode( build_fieldSel( yylloc, new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( yylloc, *$1 ) ), maybeMoveBuild( $2 ) ) ); }
877	\| FLOATING_DECIMALconstant '[' field_name_list ']'
878	{ $$ = new ExpressionNode( build_fieldSel( yylloc, new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( yylloc, *$1 ) ), build_tuple( yylloc, $3 ) ) ); }
879	\| field_name '.' field
880	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, maybeMoveBuild( $3 ) ) ); }
881	\| field_name '.' '[' field_name_list ']'
882	{ $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
883	\| field_name ARROW field
884	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, maybeMoveBuild( $3 ) ) ); }
885	\| field_name ARROW '[' field_name_list ']'
886	{ $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
887	;
888
889	field_name:
890	INTEGERconstant fraction_constants_opt
891	{ $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_constantInteger( yylloc, *$1 ), $2 ) ); }
892	\| FLOATINGconstant fraction_constants_opt
893	{ $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_field_name_FLOATINGconstant( yylloc, *$1 ), $2 ) ); }
894	\| identifier_at fraction_constants_opt // CFA, allow anonymous fields
895	{
896	$$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_varref( yylloc, $1 ), $2 ) );
897	}
898	;
899
900	fraction_constants_opt:
901	// empty
902	{ $$ = nullptr; }
903	\| fraction_constants_opt FLOATING_FRACTIONconstant
904	{
905	ast::Expr * constant = build_field_name_FLOATING_FRACTIONconstant( yylloc, *$2 );
906	$$ = $1 != nullptr ? new ExpressionNode( build_fieldSel( yylloc, $1, constant ) ) : new ExpressionNode( constant );
907	}
908	;
909
910	unary_expression:
911	postfix_expression
912	// first location where constant/string can have operator applied: sizeof 3/sizeof "abc" still requires
913	// semantics checks, e.g., ++3, 3--, *3, &&3
914	\| constant
915	\| string_literal
916	{ $$ = $1; }
917	\| EXTENSION cast_expression // GCC
918	{ $$ = $2->set_extension( true ); }
919	// '*' ('&') is separated from unary_operator because of shift/reduce conflict in:
920	// { * X; } // dereference X
921	// { * int X; } // CFA declaration of pointer to int
922	\| ptrref_operator cast_expression // CFA
923	{
924	switch ( $1 ) {
925	case OperKinds::AddressOf:
926	$$ = new ExpressionNode( new ast::AddressExpr( maybeMoveBuild( $2 ) ) );
927	break;
928	case OperKinds::PointTo:
929	$$ = new ExpressionNode( build_unary_val( yylloc, $1, $2 ) );
930	break;
931	case OperKinds::And:
932	$$ = new ExpressionNode( new ast::AddressExpr( new ast::AddressExpr( maybeMoveBuild( $2 ) ) ) );
933	break;
934	default:
935	assert( false );
936	}
937	}
938	\| unary_operator cast_expression
939	{ $$ = new ExpressionNode( build_unary_val( yylloc, $1, $2 ) ); }
940	\| ICR unary_expression
941	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::Incr, $2 ) ); }
942	\| DECR unary_expression
943	{ $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::Decr, $2 ) ); }
944	\| SIZEOF unary_expression
945	{ $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuild( $2 ) ) ); }
946	\| SIZEOF '(' type_no_function ')'
947	{ $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
948	\| ALIGNOF unary_expression // GCC, variable alignment
949	{ $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuild( $2 ) ) ); }
950	\| ALIGNOF '(' type_no_function ')' // GCC, type alignment
951	{ $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
952
953	// Cannot use rule "type", which includes cfa_abstract_function, for sizeof/alignof, because of S/R problems on
954	// look ahead, so the cfa_abstract_function is factored out.
955	\| SIZEOF '(' cfa_abstract_function ')'
956	{ $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
957	\| ALIGNOF '(' cfa_abstract_function ')' // GCC, type alignment
958	{ $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
959
960	\| OFFSETOF '(' type_no_function ',' identifier ')'
961	{ $$ = new ExpressionNode( build_offsetOf( yylloc, $3, build_varref( yylloc, $5 ) ) ); }
962	\| TYPEID '(' type ')'
963	{
964	SemanticError( yylloc, "typeid name is currently unimplemented." ); $$ = nullptr;
965	// $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) );
966	}
967	;
968
969	ptrref_operator:
970	'*' { $$ = OperKinds::PointTo; }
971	\| '&' { $$ = OperKinds::AddressOf; }
972	// GCC, address of label must be handled by semantic check for ref,ref,label
973	\| ANDAND { $$ = OperKinds::And; }
974	;
975
976	unary_operator:
977	'+' { $$ = OperKinds::UnPlus; }
978	\| '-' { $$ = OperKinds::UnMinus; }
979	\| '!' { $$ = OperKinds::Neg; }
980	\| '~' { $$ = OperKinds::BitNeg; }
981	;
982
983	cast_expression:
984	unary_expression
985	\| '(' type_no_function ')' cast_expression
986	{ $$ = new ExpressionNode( build_cast( yylloc, $2, $4 ) ); }
987	\| '(' aggregate_control '&' ')' cast_expression // CFA
988	{ $$ = new ExpressionNode( build_keyword_cast( yylloc, $2, $5 ) ); }
989	\| '(' aggregate_control '*' ')' cast_expression // CFA
990	{ $$ = new ExpressionNode( build_keyword_cast( yylloc, $2, $5 ) ); }
991	\| '(' VIRTUAL ')' cast_expression // CFA
992	{ $$ = new ExpressionNode( new ast::VirtualCastExpr( yylloc, maybeMoveBuild( $4 ), nullptr ) ); }
993	\| '(' VIRTUAL type_no_function ')' cast_expression // CFA
994	{ $$ = new ExpressionNode( new ast::VirtualCastExpr( yylloc, maybeMoveBuild( $5 ), maybeMoveBuildType( $3 ) ) ); }
995	\| '(' RETURN type_no_function ')' cast_expression // CFA
996	{ $$ = new ExpressionNode( build_cast( yylloc, $3, $5, ast::CastExpr::Return ) ); }
997	\| '(' COERCE type_no_function ')' cast_expression // CFA
998	{ SemanticError( yylloc, "Coerce cast is currently unimplemented." ); $$ = nullptr; }
999	\| '(' qualifier_cast_list ')' cast_expression // CFA
1000	{ SemanticError( yylloc, "Qualifier cast is currently unimplemented." ); $$ = nullptr; }
1001	// \| '(' type_no_function ')' tuple
1002	// { $$ = new ast::ExpressionNode( build_cast( yylloc, $2, $4 ) ); }
1003	;
1004
1005	qualifier_cast_list:
1006	cast_modifier type_qualifier_name
1007	\| cast_modifier MUTEX
1008	\| qualifier_cast_list cast_modifier type_qualifier_name
1009	\| qualifier_cast_list cast_modifier MUTEX
1010	;
1011
1012	cast_modifier:
1013	'-'
1014	\| '+'
1015	;
1016
1017	exponential_expression:
1018	cast_expression
1019	\| exponential_expression '\\' cast_expression
1020	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Exp, $1, $3 ) ); }
1021	;
1022
1023	multiplicative_expression:
1024	exponential_expression
1025	\| multiplicative_expression '*' exponential_expression
1026	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Mul, $1, $3 ) ); }
1027	\| multiplicative_expression '/' exponential_expression
1028	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Div, $1, $3 ) ); }
1029	\| multiplicative_expression '%' exponential_expression
1030	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Mod, $1, $3 ) ); }
1031	;
1032
1033	additive_expression:
1034	multiplicative_expression
1035	\| additive_expression '+' multiplicative_expression
1036	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Plus, $1, $3 ) ); }
1037	\| additive_expression '-' multiplicative_expression
1038	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Minus, $1, $3 ) ); }
1039	;
1040
1041	shift_expression:
1042	additive_expression
1043	\| shift_expression LS additive_expression
1044	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LShift, $1, $3 ) ); }
1045	\| shift_expression RS additive_expression
1046	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::RShift, $1, $3 ) ); }
1047	;
1048
1049	relational_expression:
1050	shift_expression
1051	\| relational_expression '<' shift_expression
1052	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LThan, $1, $3 ) ); }
1053	\| relational_expression '>' shift_expression
1054	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::GThan, $1, $3 ) ); }
1055	\| relational_expression LE shift_expression
1056	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LEThan, $1, $3 ) ); }
1057	\| relational_expression GE shift_expression
1058	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::GEThan, $1, $3 ) ); }
1059	;
1060
1061	equality_expression:
1062	relational_expression
1063	\| equality_expression EQ relational_expression
1064	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Eq, $1, $3 ) ); }
1065	\| equality_expression NE relational_expression
1066	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Neq, $1, $3 ) ); }
1067	;
1068
1069	AND_expression:
1070	equality_expression
1071	\| AND_expression '&' equality_expression
1072	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::BitAnd, $1, $3 ) ); }
1073	;
1074
1075	exclusive_OR_expression:
1076	AND_expression
1077	\| exclusive_OR_expression '^' AND_expression
1078	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Xor, $1, $3 ) ); }
1079	;
1080
1081	inclusive_OR_expression:
1082	exclusive_OR_expression
1083	\| inclusive_OR_expression '\|' exclusive_OR_expression
1084	{ $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::BitOr, $1, $3 ) ); }
1085	;
1086
1087	logical_AND_expression:
1088	inclusive_OR_expression
1089	\| logical_AND_expression ANDAND inclusive_OR_expression
1090	{ $$ = new ExpressionNode( build_and_or( yylloc, $1, $3, ast::AndExpr ) ); }
1091	;
1092
1093	logical_OR_expression:
1094	logical_AND_expression
1095	\| logical_OR_expression OROR logical_AND_expression
1096	{ $$ = new ExpressionNode( build_and_or( yylloc, $1, $3, ast::OrExpr ) ); }
1097	;
1098
1099	conditional_expression:
1100	logical_OR_expression
1101	\| logical_OR_expression '?' comma_expression ':' conditional_expression
1102	{ $$ = new ExpressionNode( build_cond( yylloc, $1, $3, $5 ) ); }
1103	\| logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
1104	{ $$ = new ExpressionNode( build_cond( yylloc, $1, nullptr, $4 ) ); }
1105	;
1106
1107	constant_expression:
1108	conditional_expression
1109	;
1110
1111	assignment_expression:
1112	// CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
1113	conditional_expression
1114	\| unary_expression assignment_operator assignment_expression
1115	{
1116	// if ( $2 == OperKinds::AtAssn ) {
1117	// SemanticError( yylloc, "C @= assignment is currently unimplemented." ); $$ = nullptr;
1118	// } else {
1119	$$ = new ExpressionNode( build_binary_val( yylloc, $2, $1, $3 ) );
1120	// } // if
1121	}
1122	\| unary_expression '=' '{' initializer_list_opt comma_opt '}'
1123	{ SemanticError( yylloc, "Initializer assignment is currently unimplemented." ); $$ = nullptr; }
1124	;
1125
1126	assignment_expression_opt:
1127	// empty
1128	{ $$ = nullptr; }
1129	\| assignment_expression
1130	;
1131
1132	assignment_operator:
1133	simple_assignment_operator
1134	\| compound_assignment_operator
1135	;
1136
1137	simple_assignment_operator:
1138	'=' { $$ = OperKinds::Assign; }
1139	\| ATassign { $$ = OperKinds::AtAssn; } // CFA
1140	;
1141
1142	compound_assignment_operator:
1143	EXPassign { $$ = OperKinds::ExpAssn; }
1144	\| MULTassign { $$ = OperKinds::MulAssn; }
1145	\| DIVassign { $$ = OperKinds::DivAssn; }
1146	\| MODassign { $$ = OperKinds::ModAssn; }
1147	\| PLUSassign { $$ = OperKinds::PlusAssn; }
1148	\| MINUSassign { $$ = OperKinds::MinusAssn; }
1149	\| LSassign { $$ = OperKinds::LSAssn; }
1150	\| RSassign { $$ = OperKinds::RSAssn; }
1151	\| ANDassign { $$ = OperKinds::AndAssn; }
1152	\| ERassign { $$ = OperKinds::ERAssn; }
1153	\| ORassign { $$ = OperKinds::OrAssn; }
1154	;
1155
1156	tuple: // CFA, tuple
1157	// CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
1158	// comma_expression in cfa_identifier_parameter_array and cfa_abstract_array
1159	// '[' ']'
1160	// { $$ = new ExpressionNode( build_tuple() ); }
1161	// \| '[' push assignment_expression pop ']'
1162	// { $$ = new ExpressionNode( build_tuple( $3 ) ); }
1163	'[' ',' tuple_expression_list ']'
1164	{ $$ = new ExpressionNode( build_tuple( yylloc, (ExpressionNode *)(new ExpressionNode( nullptr ) )->set_last( $3 ) ) ); }
1165	\| '[' push assignment_expression pop ',' tuple_expression_list ']'
1166	{ $$ = new ExpressionNode( build_tuple( yylloc, (ExpressionNode *)($3->set_last( $6 ) ) )); }
1167	;
1168
1169	tuple_expression_list:
1170	assignment_expression
1171	\| '@' // CFA
1172	{ SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1173	\| tuple_expression_list ',' assignment_expression
1174	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
1175	\| tuple_expression_list ',' '@'
1176	{ SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1177	;
1178
1179	comma_expression:
1180	assignment_expression
1181	\| comma_expression ',' assignment_expression
1182	{ $$ = new ExpressionNode( new ast::CommaExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1183	;
1184
1185	comma_expression_opt:
1186	// empty
1187	{ $$ = nullptr; }
1188	\| comma_expression
1189	;
1190
1191	// ************************ STATEMENTS *****************************
1192
1193	statement:
1194	labeled_statement
1195	\| compound_statement
1196	\| expression_statement
1197	\| selection_statement
1198	\| iteration_statement
1199	\| jump_statement
1200	\| with_statement
1201	\| mutex_statement
1202	\| waitfor_statement
1203	\| waituntil_statement
1204	\| corun_statement
1205	\| cofor_statement
1206	\| exception_statement
1207	\| enable_disable_statement
1208	{ SemanticError( yylloc, "enable/disable statement is currently unimplemented." ); $$ = nullptr; }
1209	\| asm_statement
1210	\| DIRECTIVE
1211	{ $$ = new StatementNode( build_directive( yylloc, $1 ) ); }
1212	;
1213
1214	labeled_statement:
1215	// labels cannot be identifiers 0 or 1
1216	identifier_or_type_name ':' attribute_list_opt statement
1217	{ $$ = $4->add_label( yylloc, $1, $3 ); }
1218	\| identifier_or_type_name ':' attribute_list_opt error // invalid syntax rule
1219	{
1220	SemanticError( yylloc, "syntx error, label \"%s\" must be associated with a statement, "
1221	"where a declaration, case, or default is not a statement.\n"
1222	"Move the label or terminate with a semicolon.", $1.str->c_str() );
1223	$$ = nullptr;
1224	}
1225	;
1226
1227	compound_statement:
1228	'{' '}'
1229	{ $$ = new StatementNode( build_compound( yylloc, (StatementNode *)0 ) ); }
1230	\| '{' push
1231	local_label_declaration_opt // GCC, local labels appear at start of block
1232	statement_decl_list // C99, intermix declarations and statements
1233	pop '}'
1234	{ $$ = new StatementNode( build_compound( yylloc, $4 ) ); }
1235	;
1236
1237	statement_decl_list: // C99
1238	statement_decl
1239	\| statement_decl_list statement_decl
1240	{ assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1241	;
1242
1243	statement_decl:
1244	declaration // CFA, new & old style declarations
1245	{ $$ = new StatementNode( $1 ); }
1246	\| EXTENSION declaration // GCC
1247	{ distExt( $2 ); $$ = new StatementNode( $2 ); }
1248	\| function_definition
1249	{ $$ = new StatementNode( $1 ); }
1250	\| EXTENSION function_definition // GCC
1251	{ distExt( $2 ); $$ = new StatementNode( $2 ); }
1252	\| statement
1253	;
1254
1255	statement_list_nodecl:
1256	statement
1257	\| statement_list_nodecl statement
1258	{ assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1259	\| statement_list_nodecl error // invalid syntax rule
1260	{ SemanticError( yylloc, "syntax error, declarations only allowed at the start of the switch body,"
1261	" i.e., after the '{'." ); $$ = nullptr; }
1262	;
1263
1264	expression_statement:
1265	comma_expression_opt ';'
1266	{ $$ = new StatementNode( build_expr( yylloc, $1 ) ); }
1267	;
1268
1269	// "if", "switch", and "choose" require parenthesis around the conditional. See the following ambiguities without
1270	// parenthesis:
1271	//
1272	// if x + y + z; => "if ( x + y ) + z" or "if ( x ) + y + z"
1273	//
1274	// switch O { }
1275	//
1276	// O{} => object-constructor for conditional, switch body ???
1277	// O{} => O for conditional followed by switch body
1278	//
1279	// C++ has this problem, as it has the same constructor syntax.
1280	//
1281	// switch sizeof ( T ) { }
1282	//
1283	// sizeof ( T ) => sizeof of T for conditional followed by switch body
1284	// sizeof ( T ) => sizeof of compound literal (T){ }, closing parenthesis ???
1285	//
1286	// Note the two grammar rules for sizeof (alignof)
1287	//
1288	// \| SIZEOF unary_expression
1289	// \| SIZEOF '(' type_no_function ')'
1290	//
1291	// where the first DOES NOT require parenthesis! And C++ inherits this problem from C.
1292
1293	selection_statement:
1294	IF '(' conditional_declaration ')' statement %prec THEN
1295	// explicitly deal with the shift/reduce conflict on if/else
1296	{ $$ = new StatementNode( build_if( yylloc, $3, maybe_build_compound( yylloc, $5 ), nullptr ) ); }
1297	\| IF '(' conditional_declaration ')' statement ELSE statement
1298	{ $$ = new StatementNode( build_if( yylloc, $3, maybe_build_compound( yylloc, $5 ), maybe_build_compound( yylloc, $7 ) ) ); }
1299	\| SWITCH '(' comma_expression ')' case_clause
1300	{ $$ = new StatementNode( build_switch( yylloc, true, $3, $5 ) ); }
1301	\| SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1302	{
1303	StatementNode *sw = new StatementNode( build_switch( yylloc, true, $3, $8 ) );
1304	// The semantics of the declaration list is changed to include associated initialization, which is performed
1305	// before the transfer to the appropriate case clause by hoisting the declarations into a compound
1306	// statement around the switch. Statements after the initial declaration list can never be executed, and
1307	// therefore, are removed from the grammar even though C allows it. The change also applies to choose
1308	// statement.
1309	$$ = $7 ? new StatementNode( build_compound( yylloc, (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1310	}
1311	\| SWITCH '(' comma_expression ')' '{' error '}' // CFA, invalid syntax rule error
1312	{ SemanticError( yylloc, "synatx error, declarations can only appear before the list of case clauses." ); $$ = nullptr; }
1313	\| CHOOSE '(' comma_expression ')' case_clause // CFA
1314	{ $$ = new StatementNode( build_switch( yylloc, false, $3, $5 ) ); }
1315	\| CHOOSE '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1316	{
1317	StatementNode *sw = new StatementNode( build_switch( yylloc, false, $3, $8 ) );
1318	$$ = $7 ? new StatementNode( build_compound( yylloc, (StatementNode *)((new StatementNode( $7 ))->set_last( sw )) ) ) : sw;
1319	}
1320	\| CHOOSE '(' comma_expression ')' '{' error '}' // CFA, invalid syntax rule
1321	{ SemanticError( yylloc, "syntax error, declarations can only appear before the list of case clauses." ); $$ = nullptr; }
1322	;
1323
1324	conditional_declaration:
1325	comma_expression
1326	{ $$ = new CondCtl( nullptr, $1 ); }
1327	\| c_declaration // no semi-colon
1328	{ $$ = new CondCtl( $1, nullptr ); }
1329	\| cfa_declaration // no semi-colon
1330	{ $$ = new CondCtl( $1, nullptr ); }
1331	\| declaration comma_expression // semi-colon separated
1332	{ $$ = new CondCtl( $1, $2 ); }
1333	;
1334
1335	// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
1336	// clause allows a list of values and subranges.
1337
1338	case_value: // CFA
1339	constant_expression { $$ = $1; }
1340	\| constant_expression ELLIPSIS constant_expression // GCC, subrange
1341	{ $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1342	\| subrange // CFA, subrange
1343	;
1344
1345	case_value_list: // CFA
1346	case_value { $$ = new ClauseNode( build_case( yylloc, $1 ) ); }
1347	// convert case list, e.g., "case 1, 3, 5:" into "case 1: case 3: case 5"
1348	\| case_value_list ',' case_value { $$ = $1->set_last( new ClauseNode( build_case( yylloc, $3 ) ) ); }
1349	;
1350
1351	case_label: // CFA
1352	CASE error // invalid syntax rule
1353	{ SemanticError( yylloc, "syntax error, case list missing after case." ); $$ = nullptr; }
1354	\| CASE case_value_list ':' { $$ = $2; }
1355	\| CASE case_value_list error // invalid syntax rule
1356	{ SemanticError( yylloc, "syntax error, colon missing after case list." ); $$ = nullptr; }
1357	\| DEFAULT ':' { $$ = new ClauseNode( build_default( yylloc ) ); }
1358	// A semantic check is required to ensure only one default clause per switch/choose statement.
1359	\| DEFAULT error // invalid syntax rule
1360	{ SemanticError( yylloc, "syntax error, colon missing after default." ); $$ = nullptr; }
1361	;
1362
1363	case_label_list: // CFA
1364	case_label
1365	\| case_label_list case_label { $$ = $1->set_last( $2 ); }
1366	;
1367
1368	case_clause: // CFA
1369	case_label_list statement { $$ = $1->append_last_case( maybe_build_compound( yylloc, $2 ) ); }
1370	;
1371
1372	switch_clause_list_opt: // CFA
1373	// empty
1374	{ $$ = nullptr; }
1375	\| switch_clause_list
1376	;
1377
1378	switch_clause_list: // CFA
1379	case_label_list statement_list_nodecl
1380	{ $$ = $1->append_last_case( new StatementNode( build_compound( yylloc, $2 ) ) ); }
1381	\| switch_clause_list case_label_list statement_list_nodecl
1382	{ $$ = $1->set_last( $2->append_last_case( new StatementNode( build_compound( yylloc, $3 ) ) ) ); }
1383	;
1384
1385	iteration_statement:
1386	WHILE '(' ')' statement %prec THEN // CFA => while ( 1 )
1387	{ $$ = new StatementNode( build_while( yylloc, new CondCtl( nullptr, NEW_ONE ), maybe_build_compound( yylloc, $4 ) ) ); }
1388	\| WHILE '(' ')' statement ELSE statement // CFA
1389	{
1390	$$ = new StatementNode( build_while( yylloc, new CondCtl( nullptr, NEW_ONE ), maybe_build_compound( yylloc, $4 ) ) );
1391	SemanticWarning( yylloc, Warning::SuperfluousElse );
1392	}
1393	\| WHILE '(' conditional_declaration ')' statement %prec THEN
1394	{ $$ = new StatementNode( build_while( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1395	\| WHILE '(' conditional_declaration ')' statement ELSE statement // CFA
1396	{ $$ = new StatementNode( build_while( yylloc, $3, maybe_build_compound( yylloc, $5 ), $7 ) ); }
1397	\| DO statement WHILE '(' ')' ';' // CFA => do while( 1 )
1398	{ $$ = new StatementNode( build_do_while( yylloc, NEW_ONE, maybe_build_compound( yylloc, $2 ) ) ); }
1399	\| DO statement WHILE '(' ')' ELSE statement // CFA
1400	{
1401	$$ = new StatementNode( build_do_while( yylloc, NEW_ONE, maybe_build_compound( yylloc, $2 ) ) );
1402	SemanticWarning( yylloc, Warning::SuperfluousElse );
1403	}
1404	\| DO statement WHILE '(' comma_expression ')' ';'
1405	{ $$ = new StatementNode( build_do_while( yylloc, $5, maybe_build_compound( yylloc, $2 ) ) ); }
1406	\| DO statement WHILE '(' comma_expression ')' ELSE statement // CFA
1407	{ $$ = new StatementNode( build_do_while( yylloc, $5, maybe_build_compound( yylloc, $2 ), $8 ) ); }
1408	\| FOR '(' ')' statement %prec THEN // CFA => for ( ;; )
1409	{ $$ = new StatementNode( build_for( yylloc, new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( yylloc, $4 ) ) ); }
1410	\| FOR '(' ')' statement ELSE statement // CFA
1411	{
1412	$$ = new StatementNode( build_for( yylloc, new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( yylloc, $4 ) ) );
1413	SemanticWarning( yylloc, Warning::SuperfluousElse );
1414	}
1415	\| FOR '(' for_control_expression_list ')' statement %prec THEN
1416	{ $$ = new StatementNode( build_for( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1417	\| FOR '(' for_control_expression_list ')' statement ELSE statement // CFA
1418	{ $$ = new StatementNode( build_for( yylloc, $3, maybe_build_compound( yylloc, $5 ), $7 ) ); }
1419	;
1420
1421	for_control_expression_list:
1422	for_control_expression
1423	\| for_control_expression_list ':' for_control_expression
1424	// ForCtrl + ForCtrl:
1425	// init + init => multiple declaration statements that are hoisted
1426	// condition + condition => (expression) && (expression)
1427	// change + change => (expression), (expression)
1428	{
1429	$1->init->set_last( $3->init );
1430	if ( $1->condition ) {
1431	if ( $3->condition ) {
1432	$1->condition->expr.reset( new ast::LogicalExpr( yylloc, $1->condition->expr.release(), $3->condition->expr.release(), ast::AndExpr ) );
1433	} // if
1434	} else $1->condition = $3->condition;
1435	if ( $1->change ) {
1436	if ( $3->change ) {
1437	$1->change->expr.reset( new ast::CommaExpr( yylloc, $1->change->expr.release(), $3->change->expr.release() ) );
1438	} // if
1439	} else $1->change = $3->change;
1440	$$ = $1;
1441	}
1442	;
1443
1444	for_control_expression:
1445	';' comma_expression_opt ';' comma_expression_opt
1446	{ $$ = new ForCtrl( nullptr, $2, $4 ); }
1447	\| comma_expression ';' comma_expression_opt ';' comma_expression_opt
1448	{
1449	StatementNode * init = $1 ? new StatementNode( new ast::ExprStmt( yylloc, maybeMoveBuild( $1 ) ) ) : nullptr;
1450	$$ = new ForCtrl( init, $3, $5 );
1451	}
1452	\| declaration comma_expression_opt ';' comma_expression_opt // C99, declaration has ';'
1453	{ $$ = new ForCtrl( new StatementNode( $1 ), $2, $4 ); }
1454
1455	\| '@' ';' comma_expression // CFA, empty loop-index
1456	{ $$ = new ForCtrl( nullptr, $3, nullptr ); }
1457	\| '@' ';' comma_expression ';' comma_expression // CFA, empty loop-index
1458	{ $$ = new ForCtrl( nullptr, $3, $5 ); }
1459
1460	\| comma_expression // CFA, anonymous loop-index
1461	{ $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), NEW_ZERO, OperKinds::LThan, $1->clone(), NEW_ONE ); }
1462	\| downupdowneq comma_expression // CFA, anonymous loop-index
1463	{ $$ = forCtrl( yylloc, $2, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $1, NEW_ZERO, $2->clone() ), $1, UPDOWN( $1, $2->clone(), NEW_ZERO ), NEW_ONE ); }
1464
1465	\| comma_expression updowneq comma_expression // CFA, anonymous loop-index
1466	{ $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $2, $1->clone(), $3 ), $2, UPDOWN( $2, $3->clone(), $1->clone() ), NEW_ONE ); }
1467	\| '@' updowneq comma_expression // CFA, anonymous loop-index
1468	{
1469	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1470	else $$ = forCtrl( yylloc, $3, new string( DeclarationNode::anonymous.newName() ), $3->clone(), $2, nullptr, NEW_ONE );
1471	}
1472	\| comma_expression updowneq '@' // CFA, anonymous loop-index
1473	{
1474	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1475	else { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1476	}
1477	\| comma_expression updowneq comma_expression '~' comma_expression // CFA, anonymous loop-index
1478	{ $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $2, $1->clone(), $3 ), $2, UPDOWN( $2, $3->clone(), $1->clone() ), $5 ); }
1479	\| '@' updowneq comma_expression '~' comma_expression // CFA, anonymous loop-index
1480	{
1481	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1482	else $$ = forCtrl( yylloc, $3, new string( DeclarationNode::anonymous.newName() ), $3->clone(), $2, nullptr, $5 );
1483	}
1484	\| comma_expression updowneq '@' '~' comma_expression // CFA, anonymous loop-index
1485	{
1486	if ( $2 == OperKinds::LThan \|\| $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1487	else { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1488	}
1489	\| comma_expression updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1490	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1491	\| '@' updowneq '@' // CFA, invalid syntax rule
1492	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1493	\| '@' updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1494	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1495	\| comma_expression updowneq '@' '~' '@' // CFA, invalid syntax rule
1496	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1497	\| '@' updowneq '@' '~' '@' // CFA, invalid syntax rule
1498	{ SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1499
1500	\| comma_expression ';' comma_expression // CFA
1501	{ $$ = forCtrl( yylloc, $3, $1, NEW_ZERO, OperKinds::LThan, $3->clone(), NEW_ONE ); }
1502	\| comma_expression ';' downupdowneq comma_expression // CFA
1503	{ $$ = forCtrl( yylloc, $4, $1, UPDOWN( $3, NEW_ZERO, $4->clone() ), $3, UPDOWN( $3, $4->clone(), NEW_ZERO ), NEW_ONE ); }
1504
1505	\| comma_expression ';' comma_expression updowneq comma_expression // CFA
1506	{ $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), NEW_ONE ); }
1507	\| comma_expression ';' '@' updowneq comma_expression // CFA
1508	{
1509	if ( $4 == OperKinds::LThan \|\| $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1510	else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, NEW_ONE );
1511	}
1512	\| comma_expression ';' comma_expression updowneq '@' // CFA
1513	{
1514	if ( $4 == OperKinds::GThan \|\| $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1515	else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1516	else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, NEW_ONE );
1517	}
1518	\| comma_expression ';' '@' updowneq '@' // CFA, invalid syntax rule
1519	{ SemanticError( yylloc, "syntax error, missing low/high value for up/down-to range so index is uninitialized." ); $$ = nullptr; }
1520
1521	\| comma_expression ';' comma_expression updowneq comma_expression '~' comma_expression // CFA
1522	{ $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), $7 ); }
1523	\| comma_expression ';' '@' updowneq comma_expression '~' comma_expression // CFA, invalid syntax rule
1524	{
1525	if ( $4 == OperKinds::LThan \|\| $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1526	else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, $7 );
1527	}
1528	\| comma_expression ';' comma_expression updowneq '@' '~' comma_expression // CFA
1529	{
1530	if ( $4 == OperKinds::GThan \|\| $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1531	else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1532	else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, $7 );
1533	}
1534	\| comma_expression ';' comma_expression updowneq comma_expression '~' '@' // CFA
1535	{ $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), nullptr ); }
1536	\| comma_expression ';' '@' updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1537	{
1538	if ( $4 == OperKinds::LThan \|\| $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1539	else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, nullptr );
1540	}
1541	\| comma_expression ';' comma_expression updowneq '@' '~' '@' // CFA
1542	{
1543	if ( $4 == OperKinds::GThan \|\| $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1544	else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1545	else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, nullptr );
1546	}
1547	\| comma_expression ';' '@' updowneq '@' '~' '@' // CFA
1548	{ SemanticError( yylloc, "syntax error, missing low/high value for up/down-to range so index is uninitialized." ); $$ = nullptr; }
1549
1550	\| declaration comma_expression // CFA
1551	{ $$ = forCtrl( yylloc, $1, NEW_ZERO, OperKinds::LThan, $2, NEW_ONE ); }
1552	\| declaration downupdowneq comma_expression // CFA
1553	{ $$ = forCtrl( yylloc, $1, UPDOWN( $2, NEW_ZERO, $3 ), $2, UPDOWN( $2, $3->clone(), NEW_ZERO ), NEW_ONE ); }
1554
1555	\| declaration comma_expression updowneq comma_expression // CFA
1556	{ $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2->clone(), $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), NEW_ONE ); }
1557	\| declaration '@' updowneq comma_expression // CFA
1558	{
1559	if ( $3 == OperKinds::LThan \|\| $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1560	else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, NEW_ONE );
1561	}
1562	\| declaration comma_expression updowneq '@' // CFA
1563	{
1564	if ( $3 == OperKinds::GThan \|\| $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1565	else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1566	else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, NEW_ONE );
1567	}
1568
1569	\| declaration comma_expression updowneq comma_expression '~' comma_expression // CFA
1570	{ $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2, $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), $6 ); }
1571	\| declaration '@' updowneq comma_expression '~' comma_expression // CFA
1572	{
1573	if ( $3 == OperKinds::LThan \|\| $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1574	else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, $6 );
1575	}
1576	\| declaration comma_expression updowneq '@' '~' comma_expression // CFA
1577	{
1578	if ( $3 == OperKinds::GThan \|\| $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1579	else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1580	else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, $6 );
1581	}
1582	\| declaration comma_expression updowneq comma_expression '~' '@' // CFA
1583	{ $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2, $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), nullptr ); }
1584	\| declaration '@' updowneq comma_expression '~' '@' // CFA
1585	{
1586	if ( $3 == OperKinds::LThan \|\| $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1587	else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, nullptr );
1588	}
1589	\| declaration comma_expression updowneq '@' '~' '@' // CFA
1590	{
1591	if ( $3 == OperKinds::GThan \|\| $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1592	else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "syntax error, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1593	else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, nullptr );
1594	}
1595	\| declaration '@' updowneq '@' '~' '@' // CFA, invalid syntax rule
1596	{ SemanticError( yylloc, "syntax error, missing low/high value for up/down-to range so index is uninitialized." ); $$ = nullptr; }
1597
1598	\| comma_expression ';' TYPEDEFname // CFA, array type
1599	{
1600	SemanticError( yylloc, "Type iterator is currently unimplemented." ); $$ = nullptr;
1601	//$$ = forCtrl( new ExpressionNode( build_varref( $3 ) ), $1, nullptr, OperKinds::Range, nullptr, nullptr );
1602	}
1603	\| comma_expression ';' downupdowneq TYPEDEFname // CFA, array type
1604	{
1605	if ( $3 == OperKinds::LEThan \|\| $3 == OperKinds::GEThan ) {
1606	SemanticError( yylloc, "syntax error, all enumeration ranges are equal (all values). Remove \"=~\"." ); $$ = nullptr;
1607	}
1608	SemanticError( yylloc, "Type iterator is currently unimplemented." ); $$ = nullptr;
1609	}
1610	;
1611
1612	downupdowneq:
1613	ErangeDown
1614	{ $$ = OperKinds::GThan; }
1615	\| ErangeUpEq
1616	{ $$ = OperKinds::LEThan; }
1617	\| ErangeDownEq
1618	{ $$ = OperKinds::GEThan; }
1619	;
1620
1621	updown:
1622	'~'
1623	{ $$ = OperKinds::LThan; }
1624	\| ErangeDown
1625	{ $$ = OperKinds::GThan; }
1626	;
1627
1628	updowneq:
1629	updown
1630	\| ErangeUpEq
1631	{ $$ = OperKinds::LEThan; }
1632	\| ErangeDownEq
1633	{ $$ = OperKinds::GEThan; }
1634	;
1635
1636	jump_statement:
1637	GOTO identifier_or_type_name ';'
1638	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Goto ) ); }
1639	\| GOTO '*' comma_expression ';' // GCC, computed goto
1640	// The syntax for the GCC computed goto violates normal expression precedence, e.g., goto i+3; => goto (i+3);
1641	// whereas normal operator precedence yields goto (*i)+3;
1642	{ $$ = new StatementNode( build_computedgoto( $3 ) ); }
1643	// A semantic check is required to ensure fallthru appears only in the body of a choose statement.
1644	\| fall_through_name ';' // CFA
1645	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::FallThrough ) ); }
1646	\| fall_through_name identifier_or_type_name ';' // CFA
1647	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::FallThrough ) ); }
1648	\| fall_through_name DEFAULT ';' // CFA
1649	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::FallThroughDefault ) ); }
1650	\| CONTINUE ';'
1651	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1652	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::Continue ) ); }
1653	\| CONTINUE identifier_or_type_name ';' // CFA, multi-level continue
1654	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1655	// the target of the transfer appears only at the start of an iteration statement.
1656	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Continue ) ); }
1657	\| BREAK ';'
1658	// A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1659	{ $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::Break ) ); }
1660	\| BREAK identifier_or_type_name ';' // CFA, multi-level exit
1661	// A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1662	// the target of the transfer appears only at the start of an iteration statement.
1663	{ $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Break ) ); }
1664	\| RETURN comma_expression_opt ';'
1665	{ $$ = new StatementNode( build_return( yylloc, $2 ) ); }
1666	\| RETURN '{' initializer_list_opt comma_opt '}' ';'
1667	{ SemanticError( yylloc, "Initializer return is currently unimplemented." ); $$ = nullptr; }
1668	\| SUSPEND ';'
1669	{ $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::None ) ); }
1670	\| SUSPEND compound_statement
1671	{ $$ = new StatementNode( build_suspend( yylloc, $2, ast::SuspendStmt::None ) ); }
1672	\| SUSPEND COROUTINE ';'
1673	{ $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::Coroutine ) ); }
1674	\| SUSPEND COROUTINE compound_statement
1675	{ $$ = new StatementNode( build_suspend( yylloc, $3, ast::SuspendStmt::Coroutine ) ); }
1676	\| SUSPEND GENERATOR ';'
1677	{ $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::Generator ) ); }
1678	\| SUSPEND GENERATOR compound_statement
1679	{ $$ = new StatementNode( build_suspend( yylloc, $3, ast::SuspendStmt::Generator ) ); }
1680	\| THROW assignment_expression_opt ';' // handles rethrow
1681	{ $$ = new StatementNode( build_throw( yylloc, $2 ) ); }
1682	\| THROWRESUME assignment_expression_opt ';' // handles reresume
1683	{ $$ = new StatementNode( build_resume( yylloc, $2 ) ); }
1684	\| THROWRESUME assignment_expression_opt AT assignment_expression ';' // handles reresume
1685	{ $$ = new StatementNode( build_resume_at( $2, $4 ) ); }
1686	;
1687
1688	fall_through_name: // CFA
1689	FALLTHRU
1690	\| FALLTHROUGH
1691	;
1692
1693	with_statement:
1694	WITH '(' tuple_expression_list ')' statement
1695	{ $$ = new StatementNode( build_with( yylloc, $3, $5 ) ); }
1696	;
1697
1698	// If MUTEX becomes a general qualifier, there are shift/reduce conflicts, so possibly change syntax to "with mutex".
1699	mutex_statement:
1700	MUTEX '(' argument_expression_list_opt ')' statement
1701	{
1702	if ( ! $3 ) { SemanticError( yylloc, "syntax error, mutex argument list cannot be empty." ); $$ = nullptr; }
1703	$$ = new StatementNode( build_mutex( yylloc, $3, $5 ) );
1704	}
1705	;
1706
1707	when_clause:
1708	WHEN '(' comma_expression ')' { $$ = $3; }
1709	;
1710
1711	when_clause_opt:
1712	// empty
1713	{ $$ = nullptr; }
1714	\| when_clause
1715	;
1716
1717	cast_expression_list:
1718	cast_expression
1719	\| cast_expression_list ',' cast_expression
1720	// { $$ = (ExpressionNode *)($1->set_last( $3 )); }
1721	{ SemanticError( yylloc, "List of mutex member is currently unimplemented." ); $$ = nullptr; }
1722	;
1723
1724	timeout:
1725	TIMEOUT '(' comma_expression ')' { $$ = $3; }
1726	;
1727
1728	wor:
1729	OROR
1730	\| WOR
1731
1732	waitfor:
1733	WAITFOR '(' cast_expression ')'
1734	{ $$ = $3; }
1735	\| WAITFOR '(' cast_expression_list ':' argument_expression_list_opt ')'
1736	{ $$ = (ExpressionNode *)($3->set_last( $5 )); }
1737	;
1738
1739	wor_waitfor_clause:
1740	when_clause_opt waitfor statement %prec THEN
1741	// Called first: create header for WaitForStmt.
1742	{ $$ = build_waitfor( yylloc, new ast::WaitForStmt( yylloc ), $1, $2, maybe_build_compound( yylloc, $3 ) ); }
1743	\| wor_waitfor_clause wor when_clause_opt waitfor statement
1744	{ $$ = build_waitfor( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ); }
1745	\| wor_waitfor_clause wor when_clause_opt ELSE statement
1746	{ $$ = build_waitfor_else( yylloc, $1, $3, maybe_build_compound( yylloc, $5 ) ); }
1747	\| wor_waitfor_clause wor when_clause_opt timeout statement %prec THEN
1748	{ $$ = build_waitfor_timeout( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ); }
1749	// "else" must be conditional after timeout or timeout is never triggered (i.e., it is meaningless)
1750	\| wor_waitfor_clause wor when_clause_opt timeout statement wor ELSE statement // invalid syntax rule
1751	{ SemanticError( yylloc, "syntax error, else clause must be conditional after timeout or timeout never triggered." ); $$ = nullptr; }
1752	\| wor_waitfor_clause wor when_clause_opt timeout statement wor when_clause ELSE statement
1753	{ $$ = build_waitfor_else( yylloc, build_waitfor_timeout( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ), $7, maybe_build_compound( yylloc, $9 ) ); }
1754	;
1755
1756	waitfor_statement:
1757	wor_waitfor_clause %prec THEN
1758	{ $$ = new StatementNode( $1 ); }
1759	;
1760
1761	wand:
1762	ANDAND
1763	\| WAND
1764	;
1765
1766	waituntil:
1767	WAITUNTIL '(' comma_expression ')'
1768	{ $$ = $3; }
1769	;
1770
1771	waituntil_clause:
1772	when_clause_opt waituntil statement
1773	{ $$ = build_waituntil_clause( yylloc, $1, $2, maybe_build_compound( yylloc, $3 ) ); }
1774	\| '(' wor_waituntil_clause ')'
1775	{ $$ = $2; }
1776	;
1777
1778	wand_waituntil_clause:
1779	waituntil_clause %prec THEN
1780	{ $$ = $1; }
1781	\| waituntil_clause wand wand_waituntil_clause
1782	{ $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::AND, $1, $3 ); }
1783	;
1784
1785	wor_waituntil_clause:
1786	wand_waituntil_clause
1787	{ $$ = $1; }
1788	\| wor_waituntil_clause wor wand_waituntil_clause
1789	{ $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::OR, $1, $3 ); }
1790	\| wor_waituntil_clause wor when_clause_opt ELSE statement
1791	{ $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::LEFT_OR, $1, build_waituntil_else( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1792	;
1793
1794	waituntil_statement:
1795	wor_waituntil_clause %prec THEN
1796	{ $$ = new StatementNode( build_waituntil_stmt( yylloc, $1 ) ); }
1797	;
1798
1799	corun_statement:
1800	CORUN statement
1801	{ $$ = new StatementNode( build_corun( yylloc, $2 ) ); }
1802	;
1803
1804	cofor_statement:
1805	COFOR '(' for_control_expression_list ')' statement
1806	{ $$ = new StatementNode( build_cofor( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1807	;
1808
1809	exception_statement:
1810	TRY compound_statement handler_clause %prec THEN
1811	{ $$ = new StatementNode( build_try( yylloc, $2, $3, nullptr ) ); }
1812	\| TRY compound_statement finally_clause
1813	{ $$ = new StatementNode( build_try( yylloc, $2, nullptr, $3 ) ); }
1814	\| TRY compound_statement handler_clause finally_clause
1815	{ $$ = new StatementNode( build_try( yylloc, $2, $3, $4 ) ); }
1816	;
1817
1818	handler_clause:
1819	handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement
1820	{ $$ = new ClauseNode( build_catch( yylloc, $1, $4, $6, $8 ) ); }
1821	\| handler_clause handler_key '(' push exception_declaration pop handler_predicate_opt ')' compound_statement
1822	{ $$ = $1->set_last( new ClauseNode( build_catch( yylloc, $2, $5, $7, $9 ) ) ); }
1823	;
1824
1825	handler_predicate_opt:
1826	// empty
1827	{ $$ = nullptr; }
1828	\| ';' conditional_expression { $$ = $2; }
1829	;
1830
1831	handler_key:
1832	CATCH { $$ = ast::Terminate; }
1833	\| RECOVER { $$ = ast::Terminate; }
1834	\| CATCHRESUME { $$ = ast::Resume; }
1835	\| FIXUP { $$ = ast::Resume; }
1836	;
1837
1838	finally_clause:
1839	FINALLY compound_statement { $$ = new ClauseNode( build_finally( yylloc, $2 ) ); }
1840	;
1841
1842	exception_declaration:
1843	// No SUE declaration in parameter list.
1844	type_specifier_nobody
1845	\| type_specifier_nobody declarator
1846	{ $$ = $2->addType( $1 ); }
1847	\| type_specifier_nobody variable_abstract_declarator
1848	{ $$ = $2->addType( $1 ); }
1849	\| cfa_abstract_declarator_tuple identifier // CFA
1850	{ $$ = $1->addName( $2 ); }
1851	\| cfa_abstract_declarator_tuple // CFA
1852	;
1853
1854	enable_disable_statement:
1855	enable_disable_key identifier_list compound_statement
1856	;
1857
1858	enable_disable_key:
1859	ENABLE
1860	\| DISABLE
1861	;
1862
1863	asm_statement:
1864	ASM asm_volatile_opt '(' string_literal ')' ';'
1865	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, nullptr ) ); }
1866	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ')' ';' // remaining GCC
1867	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, $6 ) ); }
1868	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ')' ';'
1869	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, $6, $8 ) ); }
1870	\| ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
1871	{ $$ = new StatementNode( build_asm( yylloc, $2, $4, $6, $8, $10 ) ); }
1872	\| ASM asm_volatile_opt GOTO '(' string_literal ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
1873	{ $$ = new StatementNode( build_asm( yylloc, $2, $5, nullptr, $8, $10, $12 ) ); }
1874	;
1875
1876	asm_volatile_opt: // GCC
1877	// empty
1878	{ $$ = false; }
1879	\| VOLATILE
1880	{ $$ = true; }
1881	;
1882
1883	asm_operands_opt: // GCC
1884	// empty
1885	{ $$ = nullptr; } // use default argument
1886	\| asm_operands_list
1887	;
1888
1889	asm_operands_list: // GCC
1890	asm_operand
1891	\| asm_operands_list ',' asm_operand
1892	{ $$ = (ExpressionNode *)($1->set_last( $3 )); }
1893	;
1894
1895	asm_operand: // GCC
1896	string_literal '(' constant_expression ')'
1897	{ $$ = new ExpressionNode( new ast::AsmExpr( yylloc, "", maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1898	\| '[' IDENTIFIER ']' string_literal '(' constant_expression ')'
1899	{
1900	$$ = new ExpressionNode( new ast::AsmExpr( yylloc, *$2.str, maybeMoveBuild( $4 ), maybeMoveBuild( $6 ) ) );
1901	delete $2.str;
1902	}
1903	;
1904
1905	asm_clobbers_list_opt: // GCC
1906	// empty
1907	{ $$ = nullptr; } // use default argument
1908	\| string_literal
1909	{ $$ = $1; }
1910	\| asm_clobbers_list_opt ',' string_literal
1911	{ $$ = (ExpressionNode *)( $1->set_last( $3 ) ); }
1912	;
1913
1914	label_list:
1915	identifier
1916	{
1917	$$ = new LabelNode(); $$->labels.emplace_back( yylloc, *$1 );
1918	delete $1; // allocated by lexer
1919	}
1920	\| label_list ',' identifier
1921	{
1922	$$ = $1; $1->labels.emplace_back( yylloc, *$3 );
1923	delete $3; // allocated by lexer
1924	}
1925	;
1926
1927	// **************************** DECLARATIONS *******************************
1928
1929	declaration_list_opt: // used at beginning of switch statement
1930	// empty
1931	{ $$ = nullptr; }
1932	\| declaration_list
1933	;
1934
1935	declaration_list:
1936	declaration
1937	\| declaration_list declaration
1938	{ $$ = $1->set_last( $2 ); }
1939	;
1940
1941	KR_parameter_list_opt: // used to declare parameter types in K&R style functions
1942	// empty
1943	{ $$ = nullptr; }
1944	\| KR_parameter_list
1945	;
1946
1947	KR_parameter_list:
1948	c_declaration ';'
1949	{ $$ = $1; }
1950	\| KR_parameter_list c_declaration ';'
1951	{ $$ = $1->set_last( $2 ); }
1952	;
1953
1954	local_label_declaration_opt: // GCC, local label
1955	// empty
1956	\| local_label_declaration_list
1957	;
1958
1959	local_label_declaration_list: // GCC, local label
1960	LABEL local_label_list ';'
1961	\| local_label_declaration_list LABEL local_label_list ';'
1962	;
1963
1964	local_label_list: // GCC, local label
1965	identifier_or_type_name
1966	\| local_label_list ',' identifier_or_type_name
1967	;
1968
1969	declaration: // old & new style declarations
1970	c_declaration ';'
1971	\| cfa_declaration ';' // CFA
1972	\| static_assert // C11
1973	;
1974
1975	static_assert:
1976	STATICASSERT '(' constant_expression ',' string_literal ')' ';' // C11
1977	{ $$ = DeclarationNode::newStaticAssert( $3, maybeMoveBuild( $5 ) ); }
1978	\| STATICASSERT '(' constant_expression ')' ';' // CFA
1979	{ $$ = DeclarationNode::newStaticAssert( $3, build_constantStr( yylloc, *new string( "\"\"" ) ) ); }
1980
1981	// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
1982	// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
1983	// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
1984	// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
1985	// the declaration list (as in Pascal). ANSI C and the new CFA declarations may appear together in the same program
1986	// block, but cannot be mixed within a specific declaration.
1987	//
1988	// CFA C
1989	// [10] int x; int x[10]; // array of 10 integers
1990	// [10] * char y; char *y[10]; // array of 10 pointers to char
1991
1992	cfa_declaration: // CFA
1993	cfa_variable_declaration
1994	\| cfa_typedef_declaration
1995	\| cfa_function_declaration
1996	\| type_declaring_list
1997	{ SemanticError( yylloc, "otype declaration is currently unimplemented." ); $$ = nullptr; }
1998	\| trait_specifier
1999	;
2000
2001	cfa_variable_declaration: // CFA
2002	cfa_variable_specifier initializer_opt
2003	{ $$ = $1->addInitializer( $2 ); }
2004	\| declaration_qualifier_list cfa_variable_specifier initializer_opt
2005	// declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
2006	// them as a type_qualifier cannot appear in that context.
2007	{ $$ = $2->addQualifiers( $1 )->addInitializer( $3 ); }
2008	\| cfa_variable_declaration pop ',' push identifier_or_type_name initializer_opt
2009	{ $$ = $1->set_last( $1->cloneType( $5 )->addInitializer( $6 ) ); }
2010	;
2011
2012	cfa_variable_specifier: // CFA
2013	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
2014	// storage-class
2015	cfa_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
2016	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
2017	\| cfa_abstract_tuple identifier_or_type_name asm_name_opt
2018	{ $$ = $1->addName( $2 )->addAsmName( $3 ); }
2019	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name asm_name_opt
2020	{ $$ = $2->addQualifiers( $1 )->addName( $3 )->addAsmName( $4 ); }
2021	;
2022
2023	cfa_function_declaration: // CFA
2024	cfa_function_specifier
2025	\| type_qualifier_list cfa_function_specifier
2026	{ $$ = $2->addQualifiers( $1 ); }
2027	\| declaration_qualifier_list cfa_function_specifier
2028	{ $$ = $2->addQualifiers( $1 ); }
2029	\| declaration_qualifier_list type_qualifier_list cfa_function_specifier
2030	{ $$ = $3->addQualifiers( $1 )->addQualifiers( $2 ); }
2031	\| cfa_function_declaration ',' identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')'
2032	{
2033	// Append the return type at the start (left-hand-side) to each identifier in the list.
2034	DeclarationNode * ret = new DeclarationNode;
2035	ret->type = maybeCopy( $1->type->base );
2036	$$ = $1->set_last( DeclarationNode::newFunction( $3, ret, $6, nullptr ) );
2037	}
2038	;
2039
2040	cfa_function_specifier: // CFA
2041	'[' ']' identifier '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2042	{ $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2043	\| '[' ']' TYPEDEFname '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2044	{ $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2045	// \| '[' ']' TYPEGENname '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2046	// { $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2047
2048	// identifier_or_type_name must be broken apart because of the sequence:
2049	//
2050	// '[' ']' identifier_or_type_name '(' cfa_parameter_list_ellipsis_opt ')'
2051	// '[' ']' type_specifier
2052	//
2053	// type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
2054	// flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
2055	\| cfa_abstract_tuple identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2056	// To obtain LR(1 ), this rule must be factored out from function return type (see cfa_abstract_declarator).
2057	{ $$ = DeclarationNode::newFunction( $2, $1, $5, nullptr )->addQualifiers( $8 ); }
2058	\| cfa_function_return identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2059	{ $$ = DeclarationNode::newFunction( $2, $1, $5, nullptr )->addQualifiers( $8 ); }
2060	;
2061
2062	cfa_function_return: // CFA
2063	'[' push cfa_parameter_list pop ']'
2064	{ $$ = DeclarationNode::newTuple( $3 ); }
2065	\| '[' push cfa_parameter_list ',' cfa_abstract_parameter_list pop ']'
2066	// To obtain LR(1 ), the last cfa_abstract_parameter_list is added into this flattened rule to lookahead to the ']'.
2067	{ $$ = DeclarationNode::newTuple( $3->set_last( $5 ) ); }
2068	;
2069
2070	cfa_typedef_declaration: // CFA
2071	TYPEDEF cfa_variable_specifier
2072	{
2073	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "cfa_typedef_declaration 1" );
2074	$$ = $2->addTypedef();
2075	}
2076	\| TYPEDEF cfa_function_specifier
2077	{
2078	typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "cfa_typedef_declaration 2" );
2079	$$ = $2->addTypedef();
2080	}
2081	\| cfa_typedef_declaration ',' identifier
2082	{
2083	typedefTable.addToEnclosingScope( *$3, TYPEDEFname, "cfa_typedef_declaration 3" );
2084	$$ = $1->set_last( $1->cloneType( $3 ) );
2085	}
2086	;
2087
2088	// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
2089	// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.
2090
2091	typedef_declaration:
2092	TYPEDEF type_specifier declarator
2093	{
2094	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "typedef_declaration 1" );
2095	if ( $2->type->forall \|\| ($2->type->kind == TypeData::Aggregate && $2->type->aggregate.params) ) {
2096	SemanticError( yylloc, "forall qualifier in typedef is currently unimplemented." ); $$ = nullptr;
2097	} else $$ = $3->addType( $2 )->addTypedef(); // watchout frees $2 and $3
2098	}
2099	\| typedef_declaration ',' declarator
2100	{
2101	typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "typedef_declaration 2" );
2102	$$ = $1->set_last( $1->cloneBaseType( $3 )->addTypedef() );
2103	}
2104	\| type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
2105	{ SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2106	\| type_specifier TYPEDEF declarator
2107	{ SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2108	\| type_specifier TYPEDEF type_qualifier_list declarator
2109	{ SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2110	;
2111
2112	typedef_expression:
2113	// deprecated GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
2114	TYPEDEF identifier '=' assignment_expression
2115	{
2116	SemanticError( yylloc, "TYPEDEF expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
2117	}
2118	\| typedef_expression ',' identifier '=' assignment_expression
2119	{
2120	SemanticError( yylloc, "TYPEDEF expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
2121	}
2122	;
2123
2124	c_declaration:
2125	declaration_specifier declaring_list
2126	{ $$ = distAttr( $1, $2 ); }
2127	\| typedef_declaration
2128	\| typedef_expression // deprecated GCC, naming expression type
2129	\| sue_declaration_specifier
2130	{
2131	assert( $1->type );
2132	if ( $1->type->qualifiers.any() ) { // CV qualifiers ?
2133	SemanticError( yylloc, "syntax error, useless type qualifier(s) in empty declaration." ); $$ = nullptr;
2134	}
2135	// enums are never empty declarations because there must have at least one enumeration.
2136	if ( $1->type->kind == TypeData::AggregateInst && $1->storageClasses.any() ) { // storage class ?
2137	SemanticError( yylloc, "syntax error, useless storage qualifier(s) in empty aggregate declaration." ); $$ = nullptr;
2138	}
2139	}
2140	;
2141
2142	declaring_list:
2143	// A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
2144	// storage-class
2145	variable_declarator asm_name_opt initializer_opt
2146	{ $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
2147	\| variable_type_redeclarator asm_name_opt initializer_opt
2148	{ $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
2149
2150	\| general_function_declarator asm_name_opt
2151	{ $$ = $1->addAsmName( $2 )->addInitializer( nullptr ); }
2152	\| general_function_declarator asm_name_opt '=' VOID
2153	{ $$ = $1->addAsmName( $2 )->addInitializer( new InitializerNode( true ) ); }
2154
2155	\| declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
2156	{ $$ = $1->set_last( $4->addQualifiers( $3 )->addAsmName( $5 )->addInitializer( $6 ) ); }
2157	;
2158
2159	general_function_declarator:
2160	function_type_redeclarator
2161	\| function_declarator
2162	;
2163
2164	declaration_specifier: // type specifier + storage class
2165	basic_declaration_specifier
2166	\| type_declaration_specifier
2167	\| sue_declaration_specifier
2168	\| sue_declaration_specifier invalid_types // invalid syntax rule
2169	{
2170	SemanticError( yylloc, "syntax error, expecting ';' at end of \"%s\" declaration.",
2171	$1->type->enumeration.name ? "enum" : ast::AggregateDecl::aggrString( $1->type->aggregate.kind ) );
2172	$$ = nullptr;
2173	}
2174	;
2175
2176	invalid_types:
2177	aggregate_key
2178	\| basic_type_name
2179	\| indirect_type
2180	;
2181
2182	declaration_specifier_nobody: // type specifier + storage class - {...}
2183	// Preclude SUE declarations in restricted scopes:
2184	//
2185	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
2186	//
2187	// because it is impossible to call f due to name equivalence.
2188	basic_declaration_specifier
2189	\| sue_declaration_specifier_nobody
2190	\| type_declaration_specifier
2191	;
2192
2193	type_specifier: // type specifier
2194	basic_type_specifier
2195	\| sue_type_specifier
2196	\| type_type_specifier
2197	;
2198
2199	type_specifier_nobody: // type specifier - {...}
2200	// Preclude SUE declarations in restricted scopes:
2201	//
2202	// int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
2203	//
2204	// because it is impossible to call f due to name equivalence.
2205	basic_type_specifier
2206	\| sue_type_specifier_nobody
2207	\| type_type_specifier
2208	;
2209
2210	type_qualifier_list_opt: // GCC, used in asm_statement
2211	// empty
2212	{ $$ = nullptr; }
2213	\| type_qualifier_list
2214	;
2215
2216	type_qualifier_list:
2217	// A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
2218	//
2219	// ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
2220	// specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
2221	// appeared only once.
2222	type_qualifier
2223	\| type_qualifier_list type_qualifier
2224	{ $$ = $1->addQualifiers( $2 ); }
2225	;
2226
2227	type_qualifier:
2228	type_qualifier_name
2229	{ $$ = DeclarationNode::newFromTypeData( $1 ); }
2230	\| attribute // trick handles most attribute locations
2231	;
2232
2233	type_qualifier_name:
2234	CONST
2235	{ $$ = build_type_qualifier( ast::CV::Const ); }
2236	\| RESTRICT
2237	{ $$ = build_type_qualifier( ast::CV::Restrict ); }
2238	\| VOLATILE
2239	{ $$ = build_type_qualifier( ast::CV::Volatile ); }
2240	\| ATOMIC
2241	{ $$ = build_type_qualifier( ast::CV::Atomic ); }
2242
2243	// forall must be a CV qualifier because it can appear in places where SC qualifiers are disallowed.
2244	//
2245	// void foo( forall( T ) T (*)( T ) ); // forward declaration
2246	// void bar( static int ); // static disallowed (gcc/CFA)
2247	\| forall
2248	{ $$ = build_forall( $1 ); }
2249	;
2250
2251	forall:
2252	FORALL '(' type_parameter_list ')' // CFA
2253	{ $$ = $3; }
2254	;
2255
2256	declaration_qualifier_list:
2257	storage_class_list
2258	\| type_qualifier_list storage_class_list // remaining OBSOLESCENT (see 2 )
2259	{ $$ = $1->addQualifiers( $2 ); }
2260	\| declaration_qualifier_list type_qualifier_list storage_class_list
2261	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2262	;
2263
2264	storage_class_list:
2265	// A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
2266	// only one of each is specified, except for inline, which can appear with the others.
2267	//
2268	// ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
2269	// specifiers in a declaration.
2270	storage_class
2271	\| storage_class_list storage_class
2272	{ $$ = $1->addQualifiers( $2 ); }
2273	;
2274
2275	storage_class:
2276	EXTERN
2277	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Extern ); }
2278	\| STATIC
2279	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Static ); }
2280	\| AUTO
2281	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Auto ); }
2282	\| REGISTER
2283	{ $$ = DeclarationNode::newStorageClass( ast::Storage::Register ); }
2284	\| THREADLOCALGCC // GCC
2285	{ $$ = DeclarationNode::newStorageClass( ast::Storage::ThreadLocalGcc ); }
2286	\| THREADLOCALC11 // C11
2287	{ $$ = DeclarationNode::newStorageClass( ast::Storage::ThreadLocalC11 ); }
2288	// Put function specifiers here to simplify parsing rules, but separate them semantically.
2289	\| INLINE // C99
2290	{ $$ = DeclarationNode::newFuncSpecifier( ast::Function::Inline ); }
2291	\| FORTRAN // C99
2292	{ $$ = DeclarationNode::newFuncSpecifier( ast::Function::Fortran ); }
2293	\| NORETURN // C11
2294	{ $$ = DeclarationNode::newFuncSpecifier( ast::Function::Noreturn ); }
2295	;
2296
2297	basic_type_name:
2298	basic_type_name_type
2299	{ $$ = DeclarationNode::newFromTypeData( $1 ); }
2300	;
2301
2302	// Just an intermediate value for conversion.
2303	basic_type_name_type:
2304	VOID
2305	{ $$ = build_basic_type( DeclarationNode::Void ); }
2306	\| BOOL // C99
2307	{ $$ = build_basic_type( DeclarationNode::Bool ); }
2308	\| CHAR
2309	{ $$ = build_basic_type( DeclarationNode::Char ); }
2310	\| INT
2311	{ $$ = build_basic_type( DeclarationNode::Int ); }
2312	\| INT128
2313	{ $$ = build_basic_type( DeclarationNode::Int128 ); }
2314	\| UINT128
2315	{ $$ = addType( build_basic_type( DeclarationNode::Int128 ), build_signedness( DeclarationNode::Unsigned ) ); }
2316	\| FLOAT
2317	{ $$ = build_basic_type( DeclarationNode::Float ); }
2318	\| DOUBLE
2319	{ $$ = build_basic_type( DeclarationNode::Double ); }
2320	\| uuFLOAT80
2321	{ $$ = build_basic_type( DeclarationNode::uuFloat80 ); }
2322	\| uuFLOAT128
2323	{ $$ = build_basic_type( DeclarationNode::uuFloat128 ); }
2324	\| uFLOAT16
2325	{ $$ = build_basic_type( DeclarationNode::uFloat16 ); }
2326	\| uFLOAT32
2327	{ $$ = build_basic_type( DeclarationNode::uFloat32 ); }
2328	\| uFLOAT32X
2329	{ $$ = build_basic_type( DeclarationNode::uFloat32x ); }
2330	\| uFLOAT64
2331	{ $$ = build_basic_type( DeclarationNode::uFloat64 ); }
2332	\| uFLOAT64X
2333	{ $$ = build_basic_type( DeclarationNode::uFloat64x ); }
2334	\| uFLOAT128
2335	{ $$ = build_basic_type( DeclarationNode::uFloat128 ); }
2336	\| DECIMAL32
2337	{ SemanticError( yylloc, "_Decimal32 is currently unimplemented." ); $$ = nullptr; }
2338	\| DECIMAL64
2339	{ SemanticError( yylloc, "_Decimal64 is currently unimplemented." ); $$ = nullptr; }
2340	\| DECIMAL128
2341	{ SemanticError( yylloc, "_Decimal128 is currently unimplemented." ); $$ = nullptr; }
2342	\| COMPLEX // C99
2343	{ $$ = build_complex_type( DeclarationNode::Complex ); }
2344	\| IMAGINARY // C99
2345	{ $$ = build_complex_type( DeclarationNode::Imaginary ); }
2346	\| SIGNED
2347	{ $$ = build_signedness( DeclarationNode::Signed ); }
2348	\| UNSIGNED
2349	{ $$ = build_signedness( DeclarationNode::Unsigned ); }
2350	\| SHORT
2351	{ $$ = build_length( DeclarationNode::Short ); }
2352	\| LONG
2353	{ $$ = build_length( DeclarationNode::Long ); }
2354	\| VA_LIST // GCC, __builtin_va_list
2355	{ $$ = build_builtin_type( DeclarationNode::Valist ); }
2356	\| AUTO_TYPE
2357	{ $$ = build_builtin_type( DeclarationNode::AutoType ); }
2358	\| vtable
2359	;
2360
2361	vtable_opt:
2362	// empty
2363	{ $$ = nullptr; }
2364	\| vtable
2365	;
2366
2367	vtable:
2368	VTABLE '(' type_name ')' default_opt
2369	{ $$ = build_vtable_type( $3 ); }
2370	;
2371
2372	default_opt:
2373	// empty
2374	{ $$ = nullptr; }
2375	\| DEFAULT
2376	{ SemanticError( yylloc, "vtable default is currently unimplemented." ); $$ = nullptr; }
2377	;
2378
2379	basic_declaration_specifier:
2380	// A semantic check is necessary for conflicting storage classes.
2381	basic_type_specifier
2382	\| declaration_qualifier_list basic_type_specifier
2383	{ $$ = $2->addQualifiers( $1 ); }
2384	\| basic_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2385	{ $$ = $1->addQualifiers( $2 ); }
2386	\| basic_declaration_specifier storage_class type_qualifier_list
2387	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2388	\| basic_declaration_specifier storage_class basic_type_specifier
2389	{ $$ = $3->addQualifiers( $2 )->addType( $1 ); }
2390	;
2391
2392	basic_type_specifier:
2393	direct_type
2394	// Cannot have type modifiers, e.g., short, long, etc.
2395	\| type_qualifier_list_opt indirect_type type_qualifier_list_opt
2396	{ $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
2397	;
2398
2399	direct_type:
2400	basic_type_name
2401	\| type_qualifier_list basic_type_name
2402	{ $$ = $2->addQualifiers( $1 ); }
2403	\| direct_type type_qualifier
2404	{ $$ = $1->addQualifiers( $2 ); }
2405	\| direct_type basic_type_name
2406	{ $$ = $1->addType( $2 ); }
2407	;
2408
2409	indirect_type:
2410	TYPEOF '(' type ')' // GCC: typeof( x ) y;
2411	{ $$ = $3; }
2412	\| TYPEOF '(' comma_expression ')' // GCC: typeof( a+b ) y;
2413	{ $$ = DeclarationNode::newTypeof( $3 ); }
2414	\| BASETYPEOF '(' type ')' // CFA: basetypeof( x ) y;
2415	{ $$ = DeclarationNode::newTypeof( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ), true ); }
2416	\| BASETYPEOF '(' comma_expression ')' // CFA: basetypeof( a+b ) y;
2417	{ $$ = DeclarationNode::newTypeof( $3, true ); }
2418	\| ZERO_T // CFA
2419	{ $$ = DeclarationNode::newFromTypeData( build_builtin_type( DeclarationNode::Zero ) ); }
2420	\| ONE_T // CFA
2421	{ $$ = DeclarationNode::newFromTypeData( build_builtin_type( DeclarationNode::One ) ); }
2422	;
2423
2424	sue_declaration_specifier: // struct, union, enum + storage class + type specifier
2425	sue_type_specifier
2426	\| declaration_qualifier_list sue_type_specifier
2427	{ $$ = $2->addQualifiers( $1 ); }
2428	\| sue_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2429	{ $$ = $1->addQualifiers( $2 ); }
2430	\| sue_declaration_specifier storage_class type_qualifier_list
2431	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2432	;
2433
2434	sue_type_specifier: // struct, union, enum + type specifier
2435	elaborated_type
2436	\| type_qualifier_list
2437	{ if ( $1->type != nullptr && $1->type->forall ) forall = true; } // remember generic type
2438	elaborated_type
2439	{ $$ = $3->addQualifiers( $1 ); }
2440	\| sue_type_specifier type_qualifier
2441	{
2442	if ( $2->type != nullptr && $2->type->forall ) forall = true; // remember generic type
2443	$$ = $1->addQualifiers( $2 );
2444	}
2445	;
2446
2447	sue_declaration_specifier_nobody: // struct, union, enum - {...} + storage class + type specifier
2448	sue_type_specifier_nobody
2449	\| declaration_qualifier_list sue_type_specifier_nobody
2450	{ $$ = $2->addQualifiers( $1 ); }
2451	\| sue_declaration_specifier_nobody storage_class // remaining OBSOLESCENT (see 2)
2452	{ $$ = $1->addQualifiers( $2 ); }
2453	\| sue_declaration_specifier_nobody storage_class type_qualifier_list
2454	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2455	;
2456
2457	sue_type_specifier_nobody: // struct, union, enum - {...} + type specifier
2458	elaborated_type_nobody
2459	\| type_qualifier_list elaborated_type_nobody
2460	{ $$ = $2->addQualifiers( $1 ); }
2461	\| sue_type_specifier_nobody type_qualifier
2462	{ $$ = $1->addQualifiers( $2 ); }
2463	;
2464
2465	type_declaration_specifier:
2466	type_type_specifier
2467	\| declaration_qualifier_list type_type_specifier
2468	{ $$ = $2->addQualifiers( $1 ); }
2469	\| type_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2470	{ $$ = $1->addQualifiers( $2 ); }
2471	\| type_declaration_specifier storage_class type_qualifier_list
2472	{ $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2473	;
2474
2475	type_type_specifier: // typedef types
2476	type_name
2477	{ $$ = DeclarationNode::newFromTypeData( $1 ); }
2478	\| type_qualifier_list type_name
2479	{ $$ = DeclarationNode::newFromTypeData( $2 )->addQualifiers( $1 ); }
2480	\| type_type_specifier type_qualifier
2481	{ $$ = $1->addQualifiers( $2 ); }
2482	;
2483
2484	type_name:
2485	TYPEDEFname
2486	{ $$ = build_typedef( $1 ); }
2487	\| '.' TYPEDEFname
2488	{ $$ = build_qualified_type( build_global_scope(), build_typedef( $2 ) ); }
2489	\| type_name '.' TYPEDEFname
2490	{ $$ = build_qualified_type( $1, build_typedef( $3 ) ); }
2491	\| typegen_name
2492	\| '.' typegen_name
2493	{ $$ = build_qualified_type( build_global_scope(), $2 ); }
2494	\| type_name '.' typegen_name
2495	{ $$ = build_qualified_type( $1, $3 ); }
2496	;
2497
2498	typegen_name: // CFA
2499	TYPEGENname
2500	{ $$ = build_type_gen( $1, nullptr ); }
2501	\| TYPEGENname '(' ')'
2502	{ $$ = build_type_gen( $1, nullptr ); }
2503	\| TYPEGENname '(' type_list ')'
2504	{ $$ = build_type_gen( $1, $3 ); }
2505	;
2506
2507	elaborated_type: // struct, union, enum
2508	aggregate_type
2509	\| enum_type
2510	;
2511
2512	elaborated_type_nobody: // struct, union, enum - {...}
2513	aggregate_type_nobody
2514	\| enum_type_nobody
2515	;
2516
2517	// ************************ AGGREGATE *****************************
2518
2519	aggregate_type: // struct, union
2520	aggregate_key attribute_list_opt
2521	{ forall = false; } // reset
2522	'{' field_declaration_list_opt '}' type_parameters_opt
2523	{ $$ = DeclarationNode::newAggregate( $1, nullptr, $7, $5, true )->addQualifiers( $2 ); }
2524	\| aggregate_key attribute_list_opt identifier
2525	{
2526	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 1" );
2527	forall = false; // reset
2528	}
2529	'{' field_declaration_list_opt '}' type_parameters_opt
2530	{
2531	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2532	}
2533	\| aggregate_key attribute_list_opt TYPEDEFname // unqualified type name
2534	{
2535	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 2" );
2536	forall = false; // reset
2537	}
2538	'{' field_declaration_list_opt '}' type_parameters_opt
2539	{
2540	DeclarationNode::newFromTypeData( build_typedef( $3 ) );
2541	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2542	}
2543	\| aggregate_key attribute_list_opt TYPEGENname // unqualified type name
2544	{
2545	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 3" );
2546	forall = false; // reset
2547	}
2548	'{' field_declaration_list_opt '}' type_parameters_opt
2549	{
2550	DeclarationNode::newFromTypeData( build_type_gen( $3, nullptr ) );
2551	$$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2552	}
2553	\| aggregate_type_nobody
2554	;
2555
2556	type_parameters_opt:
2557	// empty
2558	{ $$ = nullptr; } %prec '}'
2559	\| '(' type_list ')'
2560	{ $$ = $2; }
2561	;
2562
2563	aggregate_type_nobody: // struct, union - {...}
2564	aggregate_key attribute_list_opt identifier
2565	{
2566	typedefTable.makeTypedef( *$3, forall \|\| typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type_nobody" );
2567	forall = false; // reset
2568	$$ = DeclarationNode::newAggregate( $1, $3, nullptr, nullptr, false )->addQualifiers( $2 );
2569	}
2570	\| aggregate_key attribute_list_opt type_name
2571	{
2572	forall = false; // reset
2573	// Create new generic declaration with same name as previous forward declaration, where the IDENTIFIER is
2574	// switched to a TYPEGENname. Link any generic arguments from typegen_name to new generic declaration and
2575	if ( $3->kind == TypeData::SymbolicInst && ! $3->symbolic.isTypedef ) {
2576	$$ = DeclarationNode::newFromTypeData( $3 )->addQualifiers( $2 );
2577	} else {
2578	$$ = DeclarationNode::newAggregate( $1, $3->symbolic.name, $3->symbolic.actuals, nullptr, false )->addQualifiers( $2 );
2579	$3->symbolic.name = nullptr; // copied to $$
2580	$3->symbolic.actuals = nullptr;
2581	delete $3;
2582	}
2583	}
2584	;
2585
2586	aggregate_key:
2587	aggregate_data
2588	\| aggregate_control
2589	;
2590
2591	aggregate_data:
2592	STRUCT vtable_opt
2593	{ $$ = ast::AggregateDecl::Struct; }
2594	\| UNION
2595	{ $$ = ast::AggregateDecl::Union; }
2596	\| EXCEPTION // CFA
2597	{ $$ = ast::AggregateDecl::Exception; }
2598	;
2599
2600	aggregate_control: // CFA
2601	MONITOR
2602	{ $$ = ast::AggregateDecl::Monitor; }
2603	\| MUTEX STRUCT
2604	{ $$ = ast::AggregateDecl::Monitor; }
2605	\| GENERATOR
2606	{ $$ = ast::AggregateDecl::Generator; }
2607	\| MUTEX GENERATOR
2608	{
2609	SemanticError( yylloc, "monitor generator is currently unimplemented." );
2610	$$ = ast::AggregateDecl::NoAggregate;
2611	}
2612	\| COROUTINE
2613	{ $$ = ast::AggregateDecl::Coroutine; }
2614	\| MUTEX COROUTINE
2615	{
2616	SemanticError( yylloc, "monitor coroutine is currently unimplemented." );
2617	$$ = ast::AggregateDecl::NoAggregate;
2618	}
2619	\| THREAD
2620	{ $$ = ast::AggregateDecl::Thread; }
2621	\| MUTEX THREAD
2622	{
2623	SemanticError( yylloc, "monitor thread is currently unimplemented." );
2624	$$ = ast::AggregateDecl::NoAggregate;
2625	}
2626	;
2627
2628	field_declaration_list_opt:
2629	// empty
2630	{ $$ = nullptr; }
2631	\| field_declaration_list_opt field_declaration
2632	{ $$ = $1 ? $1->set_last( $2 ) : $2; }
2633	;
2634
2635	field_declaration:
2636	type_specifier field_declaring_list_opt ';'
2637	{
2638	// printf( "type_specifier1 %p %s\n", $$, $$->type->aggregate.name ? $$->type->aggregate.name->c_str() : "(nil)" );
2639	$$ = fieldDecl( $1, $2 );
2640	// printf( "type_specifier2 %p %s\n", $$, $$->type->aggregate.name ? $$->type->aggregate.name->c_str() : "(nil)" );
2641	// for ( Attribute * attr: reverseIterate( $$->attributes ) ) {
2642	// printf( "\tattr %s\n", attr->name.c_str() );
2643	// } // for
2644	}
2645	\| type_specifier field_declaring_list_opt '}' // invalid syntax rule
2646	{
2647	SemanticError( yylloc, "syntax error, expecting ';' at end of previous declaration." );
2648	$$ = nullptr;
2649	}
2650	\| EXTENSION type_specifier field_declaring_list_opt ';' // GCC
2651	{ $$ = fieldDecl( $2, $3 ); distExt( $$ ); }
2652	\| STATIC type_specifier field_declaring_list_opt ';' // CFA
2653	{ SemanticError( yylloc, "STATIC aggregate field qualifier currently unimplemented." ); $$ = nullptr; }
2654	\| INLINE type_specifier field_abstract_list_opt ';' // CFA
2655	{
2656	if ( ! $3 ) { // field declarator ?
2657	$3 = DeclarationNode::newName( nullptr );
2658	} // if
2659	$3->inLine = true;
2660	$$ = distAttr( $2, $3 ); // mark all fields in list
2661	distInl( $3 );
2662	}
2663	\| INLINE aggregate_control ';' // CFA
2664	{ SemanticError( yylloc, "INLINE aggregate control currently unimplemented." ); $$ = nullptr; }
2665	\| typedef_declaration ';' // CFA
2666	\| cfa_field_declaring_list ';' // CFA, new style field declaration
2667	\| EXTENSION cfa_field_declaring_list ';' // GCC
2668	{ distExt( $2 ); $$ = $2; } // mark all fields in list
2669	\| INLINE cfa_field_abstract_list ';' // CFA, new style field declaration
2670	{ $$ = $2; } // mark all fields in list
2671	\| cfa_typedef_declaration ';' // CFA
2672	\| static_assert // C11
2673	;
2674
2675	field_declaring_list_opt:
2676	// empty
2677	{ $$ = nullptr; }
2678	\| field_declarator
2679	\| field_declaring_list_opt ',' attribute_list_opt field_declarator
2680	{ $$ = $1->set_last( $4->addQualifiers( $3 ) ); }
2681	;
2682
2683	field_declarator:
2684	bit_subrange_size // C special case, no field name
2685	{ $$ = DeclarationNode::newBitfield( $1 ); }
2686	\| variable_declarator bit_subrange_size_opt
2687	// A semantic check is required to ensure bit_subrange only appears on integral types.
2688	{ $$ = $1->addBitfield( $2 ); }
2689	\| variable_type_redeclarator bit_subrange_size_opt
2690	// A semantic check is required to ensure bit_subrange only appears on integral types.
2691	{ $$ = $1->addBitfield( $2 ); }
2692	\| function_type_redeclarator bit_subrange_size_opt
2693	// A semantic check is required to ensure bit_subrange only appears on integral types.
2694	{ $$ = $1->addBitfield( $2 ); }
2695	;
2696
2697	field_abstract_list_opt:
2698	// empty
2699	{ $$ = nullptr; }
2700	\| field_abstract
2701	\| field_abstract_list_opt ',' attribute_list_opt field_abstract
2702	{ $$ = $1->set_last( $4->addQualifiers( $3 ) ); }
2703	;
2704
2705	field_abstract:
2706	// no bit fields
2707	variable_abstract_declarator
2708	;
2709
2710	cfa_field_declaring_list: // CFA, new style field declaration
2711	// bit-fields are handled by C declarations
2712	cfa_abstract_declarator_tuple identifier_or_type_name
2713	{ $$ = $1->addName( $2 ); }
2714	\| cfa_field_declaring_list ',' identifier_or_type_name
2715	{ $$ = $1->set_last( $1->cloneType( $3 ) ); }
2716	;
2717
2718	cfa_field_abstract_list: // CFA, new style field declaration
2719	// bit-fields are handled by C declarations
2720	cfa_abstract_declarator_tuple
2721	\| cfa_field_abstract_list ','
2722	{ $$ = $1->set_last( $1->cloneType( 0 ) ); }
2723	;
2724
2725	bit_subrange_size_opt:
2726	// empty
2727	{ $$ = nullptr; }
2728	\| bit_subrange_size
2729	;
2730
2731	bit_subrange_size:
2732	':' assignment_expression
2733	{ $$ = $2; }
2734	;
2735
2736	// ************************ ENUMERATION *****************************
2737
2738	enum_type:
2739	ENUM attribute_list_opt '{' enumerator_list comma_opt '}'
2740	{ $$ = DeclarationNode::newEnum( nullptr, $4, true, false )->addQualifiers( $2 ); }
2741	\| ENUM attribute_list_opt '!' '{' enumerator_list comma_opt '}' // invalid syntax rule
2742	{ SemanticError( yylloc, "syntax error, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr; }
2743	\| ENUM attribute_list_opt identifier
2744	{ typedefTable.makeTypedef( *$3, "enum_type 1" ); }
2745	hide_opt '{' enumerator_list comma_opt '}'
2746	{ $$ = DeclarationNode::newEnum( $3, $7, true, false, nullptr, $5 )->addQualifiers( $2 ); }
2747	\| ENUM attribute_list_opt typedef_name hide_opt '{' enumerator_list comma_opt '}' // unqualified type name
2748	{ $$ = DeclarationNode::newEnum( $3->name, $6, true, false, nullptr, $4 )->addQualifiers( $2 ); }
2749	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt '{' enumerator_list comma_opt '}'
2750	{
2751	if ( $3->storageClasses.val != 0 \|\| $3->type->qualifiers.any() ) {
2752	SemanticError( yylloc, "syntax error, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
2753	}
2754	$$ = DeclarationNode::newEnum( nullptr, $7, true, true, $3 )->addQualifiers( $5 );
2755	}
2756	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt '!' '{' enumerator_list comma_opt '}' // unqualified type name
2757	{ SemanticError( yylloc, "syntax error, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr; }
2758	\| ENUM '(' ')' attribute_list_opt '{' enumerator_list comma_opt '}'
2759	{
2760	$$ = DeclarationNode::newEnum( nullptr, $6, true, true )->addQualifiers( $4 );
2761	}
2762	\| ENUM '(' ')' attribute_list_opt '!' '{' enumerator_list comma_opt '}' // invalid syntax rule
2763	{ SemanticError( yylloc, "syntax error, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr; }
2764	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt identifier attribute_list_opt
2765	{
2766	if ( $3 && ($3->storageClasses.any() \|\| $3->type->qualifiers.val != 0) ) {
2767	SemanticError( yylloc, "syntax error, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
2768	}
2769	typedefTable.makeTypedef( *$6, "enum_type 2" );
2770	}
2771	hide_opt '{' enumerator_list comma_opt '}'
2772	{
2773	$$ = DeclarationNode::newEnum( $6, $11, true, true, $3, $9 )->addQualifiers( $5 )->addQualifiers( $7 );
2774	}
2775	\| ENUM '(' ')' attribute_list_opt identifier attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2776	{
2777	$$ = DeclarationNode::newEnum( $5, $9, true, true, nullptr, $7 )->addQualifiers( $4 )->addQualifiers( $6 );
2778	}
2779	\| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt typedef_name attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2780	{
2781	$$ = DeclarationNode::newEnum( $6->name, $10, true, true, $3, $8 )->addQualifiers( $5 )->addQualifiers( $7 );
2782	}
2783	\| ENUM '(' ')' attribute_list_opt typedef_name attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2784	{
2785	$$ = DeclarationNode::newEnum( $5->name, $9, true, true, nullptr, $7 )->addQualifiers( $4 )->addQualifiers( $6 );
2786	}
2787	\| enum_type_nobody
2788	;
2789
2790	hide_opt:
2791	// empty
2792	{ $$ = EnumHiding::Visible; }
2793	\| '!'
2794	{ $$ = EnumHiding::Hide; }
2795	;
2796
2797	enum_type_nobody: // enum - {...}
2798	ENUM attribute_list_opt identifier
2799	{
2800	typedefTable.makeTypedef( *$3, "enum_type_nobody 1" );
2801	$$ = DeclarationNode::newEnum( $3, nullptr, false, false )->addQualifiers( $2 );
2802	}
2803	\| ENUM attribute_list_opt type_name
2804	{
2805	typedefTable.makeTypedef( *$3->symbolic.name, "enum_type_nobody 2" );
2806	$$ = DeclarationNode::newEnum( $3->symbolic.name, nullptr, false, false )->addQualifiers( $2 );
2807	}
2808	;
2809
2810	enumerator_list:
2811	visible_hide_opt identifier_or_type_name enumerator_value_opt
2812	{ $$ = DeclarationNode::newEnumValueGeneric( $2, $3 ); }
2813	\| INLINE type_name
2814	{ $$ = DeclarationNode::newEnumInLine( *$2->symbolic.name ); }
2815	\| enumerator_list ',' visible_hide_opt identifier_or_type_name enumerator_value_opt
2816	{ $$ = $1->set_last( DeclarationNode::newEnumValueGeneric( $4, $5 ) ); }
2817	\| enumerator_list ',' INLINE type_name enumerator_value_opt
2818	{ $$ = $1->set_last( DeclarationNode::newEnumValueGeneric( new string("inline"), nullptr ) ); }
2819	;
2820
2821	visible_hide_opt:
2822	hide_opt
2823	\| '^'
2824	{ $$ = EnumHiding::Visible; }
2825	;
2826
2827	enumerator_value_opt:
2828	// empty
2829	{ $$ = nullptr; }
2830	\| '=' constant_expression { $$ = new InitializerNode( $2 ); }
2831	\| '=' '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $3, true ); }
2832	// \| simple_assignment_operator initializer
2833	// { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
2834	;
2835
2836	// ************************ FUNCTION PARAMETERS *****************************
2837
2838	parameter_list_ellipsis_opt:
2839	// empty
2840	{ $$ = nullptr; }
2841	\| ELLIPSIS
2842	{ $$ = nullptr; }
2843	\| parameter_list
2844	\| parameter_list ',' ELLIPSIS
2845	{ $$ = $1->addVarArgs(); }
2846	;
2847
2848	parameter_list: // abstract + real
2849	parameter_declaration
2850	\| abstract_parameter_declaration
2851	\| parameter_list ',' parameter_declaration
2852	{ $$ = $1->set_last( $3 ); }
2853	\| parameter_list ',' abstract_parameter_declaration
2854	{ $$ = $1->set_last( $3 ); }
2855	;
2856
2857	cfa_parameter_list_ellipsis_opt: // CFA, abstract + real
2858	// empty
2859	{ $$ = DeclarationNode::newFromTypeData( build_basic_type( DeclarationNode::Void ) ); }
2860	\| ELLIPSIS
2861	{ $$ = nullptr; }
2862	\| cfa_parameter_list
2863	\| cfa_abstract_parameter_list
2864	\| cfa_parameter_list ',' cfa_abstract_parameter_list
2865	{ $$ = $1->set_last( $3 ); }
2866	\| cfa_parameter_list ',' ELLIPSIS
2867	{ $$ = $1->addVarArgs(); }
2868	\| cfa_abstract_parameter_list ',' ELLIPSIS
2869	{ $$ = $1->addVarArgs(); }
2870	;
2871
2872	cfa_parameter_list: // CFA
2873	// To obtain LR(1) between cfa_parameter_list and cfa_abstract_tuple, the last cfa_abstract_parameter_list is
2874	// factored out from cfa_parameter_list, flattening the rules to get lookahead to the ']'.
2875	cfa_parameter_declaration
2876	\| cfa_abstract_parameter_list ',' cfa_parameter_declaration
2877	{ $$ = $1->set_last( $3 ); }
2878	\| cfa_parameter_list ',' cfa_parameter_declaration
2879	{ $$ = $1->set_last( $3 ); }
2880	\| cfa_parameter_list ',' cfa_abstract_parameter_list ',' cfa_parameter_declaration
2881	{ $$ = $1->set_last( $3 )->set_last( $5 ); }
2882	;
2883
2884	cfa_abstract_parameter_list: // CFA, new & old style abstract
2885	cfa_abstract_parameter_declaration
2886	\| cfa_abstract_parameter_list ',' cfa_abstract_parameter_declaration
2887	{ $$ = $1->set_last( $3 ); }
2888	;
2889
2890	// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
2891	// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.
2892
2893	parameter_declaration:
2894	// No SUE declaration in parameter list.
2895	declaration_specifier_nobody identifier_parameter_declarator default_initializer_opt
2896	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2897	\| declaration_specifier_nobody type_parameter_redeclarator default_initializer_opt
2898	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2899	;
2900
2901	abstract_parameter_declaration:
2902	declaration_specifier_nobody default_initializer_opt
2903	{ $$ = $1->addInitializer( $2 ? new InitializerNode( $2 ) : nullptr ); }
2904	\| declaration_specifier_nobody abstract_parameter_declarator default_initializer_opt
2905	{ $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2906	;
2907
2908	cfa_parameter_declaration: // CFA, new & old style parameter declaration
2909	parameter_declaration
2910	\| cfa_identifier_parameter_declarator_no_tuple identifier_or_type_name default_initializer_opt
2911	{ $$ = $1->addName( $2 ); }
2912	\| cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2913	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2914	{ $$ = $1->addName( $2 ); }
2915	\| type_qualifier_list cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2916	{ $$ = $2->addName( $3 )->addQualifiers( $1 ); }
2917	\| cfa_function_specifier // int f( "int fp()" );
2918	;
2919
2920	cfa_abstract_parameter_declaration: // CFA, new & old style parameter declaration
2921	abstract_parameter_declaration
2922	\| cfa_identifier_parameter_declarator_no_tuple
2923	\| cfa_abstract_tuple
2924	// To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2925	\| type_qualifier_list cfa_abstract_tuple
2926	{ $$ = $2->addQualifiers( $1 ); }
2927	\| cfa_abstract_function // int f( "int ()" );
2928	;
2929
2930	// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
2931	// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
2932	// identifiers. The ANSI-style parameter-list can redefine a typedef name.
2933
2934	identifier_list: // K&R-style parameter list => no types
2935	identifier
2936	{ $$ = DeclarationNode::newName( $1 ); }
2937	\| identifier_list ',' identifier
2938	{ $$ = $1->set_last( DeclarationNode::newName( $3 ) ); }
2939	;
2940
2941	identifier_or_type_name:
2942	identifier
2943	\| TYPEDEFname
2944	\| TYPEGENname
2945	;
2946
2947	type_no_function: // sizeof, alignof, cast (constructor)
2948	cfa_abstract_declarator_tuple // CFA
2949	\| type_specifier // cannot be type_specifier_nobody, e.g., (struct S {}){} is a thing
2950	\| type_specifier abstract_declarator
2951	{ $$ = $2->addType( $1 ); }
2952	;
2953
2954	type: // typeof, assertion
2955	type_no_function
2956	\| cfa_abstract_function // CFA
2957	;
2958
2959	initializer_opt:
2960	// empty
2961	{ $$ = nullptr; }
2962	\| simple_assignment_operator initializer { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
2963	\| '=' VOID { $$ = new InitializerNode( true ); }
2964	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2965	;
2966
2967	initializer:
2968	assignment_expression { $$ = new InitializerNode( $1 ); }
2969	\| '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
2970	;
2971
2972	initializer_list_opt:
2973	// empty
2974	{ $$ = nullptr; }
2975	\| initializer
2976	\| designation initializer { $$ = $2->set_designators( $1 ); }
2977	\| initializer_list_opt ',' initializer { $$ = (InitializerNode *)( $1->set_last( $3 ) ); }
2978	\| initializer_list_opt ',' designation initializer { $$ = (InitializerNode *)($1->set_last( $4->set_designators( $3 ) )); }
2979	;
2980
2981	// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
2982	// '=' to separator the designator from the initializer value, as in:
2983	//
2984	// int x[10] = { [1] = 3 };
2985	//
2986	// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment. To disambiguate this case, CFA
2987	// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
2988	// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
2989	// shift/reduce conflicts
2990
2991	designation:
2992	designator_list ':' // C99, CFA uses ":" instead of "="
2993	\| identifier_at ':' // GCC, field name
2994	{ $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
2995	;
2996
2997	designator_list: // C99
2998	designator
2999	\| designator_list designator
3000	{ $$ = (ExpressionNode *)($1->set_last( $2 )); }
3001	//\| designator_list designator { $$ = new ExpressionNode( $1, $2 ); }
3002	;
3003
3004	designator:
3005	'.' identifier_at // C99, field name
3006	{ $$ = new ExpressionNode( build_varref( yylloc, $2 ) ); }
3007	\| '[' push assignment_expression pop ']' // C99, single array element
3008	// assignment_expression used instead of constant_expression because of shift/reduce conflicts with tuple.
3009	{ $$ = $3; }
3010	\| '[' push subrange pop ']' // CFA, multiple array elements
3011	{ $$ = $3; }
3012	\| '[' push constant_expression ELLIPSIS constant_expression pop ']' // GCC, multiple array elements
3013	{ $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $3 ), maybeMoveBuild( $5 ) ) ); }
3014	\| '.' '[' push field_name_list pop ']' // CFA, tuple field selector
3015	{ $$ = $4; }
3016	;
3017
3018	// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
3019	// rather than an object-oriented type system. This required four groups of extensions:
3020	//
3021	// Overloading: function, data, and operator identifiers may be overloaded.
3022	//
3023	// Type declarations: "otype" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
3024	// and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
3025	// definitions of new types. Type declarations with storage class "extern" provide opaque types.
3026	//
3027	// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
3028	// site. A polymorphic function is not a template; it is a function, with an address and a type.
3029	//
3030	// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
3031	// types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
3032	// hierarchies. Unlike classes, they can define relationships between types. Assertions declare that a type or
3033	// types provide the operations declared by a specification. Assertions are normally used to declare requirements
3034	// on type arguments of polymorphic functions.
3035
3036	type_parameter_list: // CFA
3037	type_parameter
3038	\| type_parameter_list ',' type_parameter
3039	{ $$ = $1->set_last( $3 ); }
3040	;
3041
3042	type_initializer_opt: // CFA
3043	// empty
3044	{ $$ = nullptr; }
3045	\| '=' type
3046	{ $$ = $2; }
3047	;
3048
3049	type_parameter: // CFA
3050	type_class identifier_or_type_name
3051	{
3052	typedefTable.addToScope( *$2, TYPEDEFname, "type_parameter 1" );
3053	if ( $1 == ast::TypeDecl::Otype ) { SemanticError( yylloc, "otype keyword is deprecated, use T " ); }
3054	if ( $1 == ast::TypeDecl::Dtype ) { SemanticError( yylloc, "dtype keyword is deprecated, use T &" ); }
3055	if ( $1 == ast::TypeDecl::Ttype ) { SemanticError( yylloc, "ttype keyword is deprecated, use T ..." ); }
3056	}
3057	type_initializer_opt assertion_list_opt
3058	{ $$ = DeclarationNode::newTypeParam( $1, $2 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
3059	\| identifier_or_type_name new_type_class
3060	{ typedefTable.addToScope( *$1, TYPEDEFname, "type_parameter 2" ); }
3061	type_initializer_opt assertion_list_opt
3062	{ $$ = DeclarationNode::newTypeParam( $2, $1 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
3063	\| '[' identifier_or_type_name ']'
3064	{
3065	typedefTable.addToScope( *$2, TYPEDIMname, "type_parameter 3" );
3066	$$ = DeclarationNode::newTypeParam( ast::TypeDecl::Dimension, $2 );
3067	}
3068	// \| type_specifier identifier_parameter_declarator
3069	\| assertion_list
3070	{ $$ = DeclarationNode::newTypeParam( ast::TypeDecl::Dtype, new string( DeclarationNode::anonymous.newName() ) )->addAssertions( $1 ); }
3071	\| ENUM '(' identifier_or_type_name ')' identifier_or_type_name new_type_class type_initializer_opt assertion_list_opt
3072	{
3073	typedefTable.addToScope( *$3, TYPEDIMname, "type_parameter 4" );
3074	typedefTable.addToScope( *$5, TYPEDIMname, "type_parameter 5" );
3075	$$ = DeclarationNode::newTypeParam( $6, $5 )->addTypeInitializer( $7 )->addAssertions( $8 );
3076	}
3077	;
3078
3079	new_type_class: // CFA
3080	// empty
3081	{ $$ = ast::TypeDecl::Otype; }
3082	\| '&'
3083	{ $$ = ast::TypeDecl::Dtype; }
3084	\| '*'
3085	{ $$ = ast::TypeDecl::DStype; } // Dtype + sized
3086	// \| '(' '*' ')' // Gregor made me do it
3087	// { $$ = ast::TypeDecl::Ftype; }
3088	\| ELLIPSIS
3089	{ $$ = ast::TypeDecl::Ttype; }
3090	;
3091
3092	type_class: // CFA
3093	OTYPE
3094	{ $$ = ast::TypeDecl::Otype; }
3095	\| DTYPE
3096	{ $$ = ast::TypeDecl::Dtype; }
3097	\| FTYPE
3098	{ $$ = ast::TypeDecl::Ftype; }
3099	\| TTYPE
3100	{ $$ = ast::TypeDecl::Ttype; }
3101	;
3102
3103	assertion_list_opt: // CFA
3104	// empty
3105	{ $$ = nullptr; }
3106	\| assertion_list
3107	;
3108
3109	assertion_list: // CFA
3110	assertion
3111	\| assertion_list assertion
3112	{ $$ = $1->set_last( $2 ); }
3113	;
3114
3115	assertion: // CFA
3116	'\|' identifier_or_type_name '(' type_list ')'
3117	{ $$ = DeclarationNode::newTraitUse( $2, $4 ); }
3118	\| '\|' '{' push trait_declaration_list pop '}'
3119	{ $$ = $4; }
3120	// \| '\|' '(' push type_parameter_list pop ')' '{' push trait_declaration_list pop '}' '(' type_list ')'
3121	// { SemanticError( yylloc, "Generic data-type assertion is currently unimplemented." ); $$ = nullptr; }
3122	;
3123
3124	type_list: // CFA
3125	type
3126	{ $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3127	\| assignment_expression
3128	\| type_list ',' type
3129	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) )); }
3130	\| type_list ',' assignment_expression
3131	{ $$ = (ExpressionNode *)( $1->set_last( $3 )); }
3132	;
3133
3134	type_declaring_list: // CFA
3135	OTYPE type_declarator
3136	{ $$ = $2; }
3137	\| storage_class_list OTYPE type_declarator
3138	{ $$ = $3->addQualifiers( $1 ); }
3139	\| type_declaring_list ',' type_declarator
3140	{ $$ = $1->set_last( $3->copySpecifiers( $1 ) ); }
3141	;
3142
3143	type_declarator: // CFA
3144	type_declarator_name assertion_list_opt
3145	{ $$ = $1->addAssertions( $2 ); }
3146	\| type_declarator_name assertion_list_opt '=' type
3147	{ $$ = $1->addAssertions( $2 )->addType( $4 ); }
3148	;
3149
3150	type_declarator_name: // CFA
3151	identifier_or_type_name
3152	{
3153	typedefTable.addToEnclosingScope( *$1, TYPEDEFname, "type_declarator_name 1" );
3154	$$ = DeclarationNode::newTypeDecl( $1, nullptr );
3155	}
3156	\| identifier_or_type_name '(' type_parameter_list ')'
3157	{
3158	typedefTable.addToEnclosingScope( *$1, TYPEGENname, "type_declarator_name 2" );
3159	$$ = DeclarationNode::newTypeDecl( $1, $3 );
3160	}
3161	;
3162
3163	trait_specifier: // CFA
3164	TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' '}'
3165	{
3166	SemanticWarning( yylloc, Warning::DeprecTraitSyntax );
3167	$$ = DeclarationNode::newTrait( $2, $4, nullptr );
3168	}
3169	\| forall TRAIT identifier_or_type_name '{' '}' // alternate
3170	{ $$ = DeclarationNode::newTrait( $3, $1, nullptr ); }
3171	\| TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' push trait_declaration_list pop '}'
3172	{
3173	SemanticWarning( yylloc, Warning::DeprecTraitSyntax );
3174	$$ = DeclarationNode::newTrait( $2, $4, $8 );
3175	}
3176	\| forall TRAIT identifier_or_type_name '{' push trait_declaration_list pop '}' // alternate
3177	{ $$ = DeclarationNode::newTrait( $3, $1, $6 ); }
3178	;
3179
3180	trait_declaration_list: // CFA
3181	trait_declaration
3182	\| trait_declaration_list pop push trait_declaration
3183	{ $$ = $1->set_last( $4 ); }
3184	;
3185
3186	trait_declaration: // CFA
3187	cfa_trait_declaring_list ';'
3188	\| trait_declaring_list ';'
3189	;
3190
3191	cfa_trait_declaring_list: // CFA
3192	cfa_variable_specifier
3193	\| cfa_function_specifier
3194	\| cfa_trait_declaring_list pop ',' push identifier_or_type_name
3195	{ $$ = $1->set_last( $1->cloneType( $5 ) ); }
3196	;
3197
3198	trait_declaring_list: // CFA
3199	type_specifier declarator
3200	{ $$ = $2->addType( $1 ); }
3201	\| trait_declaring_list pop ',' push declarator
3202	{ $$ = $1->set_last( $1->cloneBaseType( $5 ) ); }
3203	;
3204
3205	// ************************** EXTERNAL DEFINITIONS ***************************
3206
3207	translation_unit:
3208	// empty, input file
3209	\| external_definition_list
3210	{ parseTree = parseTree ? parseTree->set_last( $1 ) : $1; }
3211	;
3212
3213	external_definition_list:
3214	push external_definition pop
3215	{ $$ = $2; }
3216	\| external_definition_list push external_definition pop
3217	{ $$ = $1 ? $1->set_last( $3 ) : $3; }
3218	;
3219
3220	external_definition_list_opt:
3221	// empty
3222	{ $$ = nullptr; }
3223	\| external_definition_list
3224	;
3225
3226	up:
3227	{ typedefTable.up( forall ); forall = false; }
3228	;
3229
3230	down:
3231	{ typedefTable.down(); }
3232	;
3233
3234	external_definition:
3235	DIRECTIVE
3236	{ $$ = DeclarationNode::newDirectiveStmt( new StatementNode( build_directive( yylloc, $1 ) ) ); }
3237	\| declaration
3238	{
3239	// Variable declarations of anonymous types requires creating a unique type-name across multiple translation
3240	// unit, which is a dubious task, especially because C uses name rather than structural typing; hence it is
3241	// disallowed at the moment.
3242	if ( $1->linkage == ast::Linkage::Cforall && ! $1->storageClasses.is_static &&
3243	$1->type && $1->type->kind == TypeData::AggregateInst ) {
3244	if ( $1->type->aggInst.aggregate->kind == TypeData::Enum && $1->type->aggInst.aggregate->enumeration.anon ) {
3245	SemanticError( yylloc, "extern anonymous enumeration is currently unimplemented." ); $$ = nullptr;
3246	} else if ( $1->type->aggInst.aggregate->aggregate.anon ) { // handles struct or union
3247	SemanticError( yylloc, "extern anonymous struct/union is currently unimplemented." ); $$ = nullptr;
3248	}
3249	}
3250	}
3251	\| IDENTIFIER IDENTIFIER
3252	{ IdentifierBeforeIdentifier( $1.str, $2.str, " declaration" ); $$ = nullptr; }
3253	\| IDENTIFIER type_qualifier // invalid syntax rule
3254	{ IdentifierBeforeType( *$1.str, "type qualifier" ); $$ = nullptr; }
3255	\| IDENTIFIER storage_class // invalid syntax rule
3256	{ IdentifierBeforeType( *$1.str, "storage class" ); $$ = nullptr; }
3257	\| IDENTIFIER basic_type_name // invalid syntax rule
3258	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3259	\| IDENTIFIER TYPEDEFname // invalid syntax rule
3260	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3261	\| IDENTIFIER TYPEGENname // invalid syntax rule
3262	{ IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3263	\| external_function_definition
3264	\| EXTENSION external_definition // GCC, multiple __extension__ allowed, meaning unknown
3265	{
3266	distExt( $2 ); // mark all fields in list
3267	$$ = $2;
3268	}
3269	\| ASM '(' string_literal ')' ';' // GCC, global assembler statement
3270	{ $$ = DeclarationNode::newAsmStmt( new StatementNode( build_asm( yylloc, false, $3, nullptr ) ) ); }
3271	\| EXTERN STRINGliteral
3272	{
3273	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
3274	linkage = ast::Linkage::update( yylloc, linkage, $2 );
3275	}
3276	up external_definition down
3277	{
3278	linkage = linkageStack.top();
3279	linkageStack.pop();
3280	$$ = $5;
3281	}
3282	\| EXTERN STRINGliteral // C++-style linkage specifier
3283	{
3284	linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
3285	linkage = ast::Linkage::update( yylloc, linkage, $2 );
3286	}
3287	'{' up external_definition_list_opt down '}'
3288	{
3289	linkage = linkageStack.top();
3290	linkageStack.pop();
3291	$$ = $6;
3292	}
3293	// global distribution
3294	\| type_qualifier_list
3295	{
3296	if ( $1->type->qualifiers.any() ) {
3297	SemanticError( yylloc, "syntax error, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3298	}
3299	if ( $1->type->forall ) forall = true; // remember generic type
3300	}
3301	'{' up external_definition_list_opt down '}' // CFA, namespace
3302	{
3303	distQual( $5, $1 );
3304	forall = false;
3305	$$ = $5;
3306	}
3307	\| declaration_qualifier_list
3308	{
3309	if ( $1->type && $1->type->qualifiers.any() ) {
3310	SemanticError( yylloc, "syntax error, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3311	}
3312	if ( $1->type && $1->type->forall ) forall = true; // remember generic type
3313	}
3314	'{' up external_definition_list_opt down '}' // CFA, namespace
3315	{
3316	distQual( $5, $1 );
3317	forall = false;
3318	$$ = $5;
3319	}
3320	\| declaration_qualifier_list type_qualifier_list
3321	{
3322	if ( ($1->type && $1->type->qualifiers.any()) \|\| ($2->type && $2->type->qualifiers.any()) ) {
3323	SemanticError( yylloc, "syntax error, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3324	}
3325	if ( ($1->type && $1->type->forall) \|\| ($2->type && $2->type->forall) ) forall = true; // remember generic type
3326	}
3327	'{' up external_definition_list_opt down '}' // CFA, namespace
3328	{
3329	distQual( $6, $1->addQualifiers( $2 ) );
3330	forall = false;
3331	$$ = $6;
3332	}
3333	;
3334
3335	external_function_definition:
3336	function_definition
3337	// These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
3338	// legacy code with global functions missing the type-specifier for the return type, and assuming "int".
3339	// Parsing is possible because function_definition does not appear in the context of an expression (nested
3340	// functions preclude this concession, i.e., all nested function must have a return type). A function prototype
3341	// declaration must still have a type_specifier. OBSOLESCENT (see 1)
3342	\| function_declarator compound_statement
3343	{ $$ = $1->addFunctionBody( $2 ); }
3344	\| KR_function_declarator KR_parameter_list_opt compound_statement
3345	{ $$ = $1->addOldDeclList( $2 )->addFunctionBody( $3 ); }
3346	;
3347
3348	with_clause_opt:
3349	// empty
3350	{ $$ = nullptr; forall = false; }
3351	\| WITH '(' tuple_expression_list ')' attribute_list_opt
3352	{
3353	$$ = $3; forall = false;
3354	if ( $5 ) {
3355	SemanticError( yylloc, "syntax error, attributes cannot be associated with function body. Move attribute(s) before \"with\" clause." );
3356	$$ = nullptr;
3357	} // if
3358	}
3359	;
3360
3361	function_definition:
3362	cfa_function_declaration with_clause_opt compound_statement // CFA
3363	{
3364	// Add the function body to the last identifier in the function definition list, i.e., foo3:
3365	// [const double] foo1(), foo2( int ), foo3( double ) { return 3.0; }
3366	$1->get_last()->addFunctionBody( $3, $2 );
3367	$$ = $1;
3368	}
3369	\| declaration_specifier function_declarator with_clause_opt compound_statement
3370	{
3371	rebindForall( $1, $2 );
3372	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
3373	}
3374	\| declaration_specifier function_type_redeclarator with_clause_opt compound_statement
3375	{
3376	rebindForall( $1, $2 );
3377	$$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
3378	}
3379	// handles default int return type, OBSOLESCENT (see 1)
3380	\| type_qualifier_list function_declarator with_clause_opt compound_statement
3381	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
3382	// handles default int return type, OBSOLESCENT (see 1)
3383	\| declaration_qualifier_list function_declarator with_clause_opt compound_statement
3384	{ $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
3385	// handles default int return type, OBSOLESCENT (see 1)
3386	\| declaration_qualifier_list type_qualifier_list function_declarator with_clause_opt compound_statement
3387	{ $$ = $3->addFunctionBody( $5, $4 )->addQualifiers( $2 )->addQualifiers( $1 ); }
3388
3389	// Old-style K&R function definition, OBSOLESCENT (see 4)
3390	\| declaration_specifier KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3391	{
3392	rebindForall( $1, $2 );
3393	$$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addType( $1 );
3394	}
3395	// handles default int return type, OBSOLESCENT (see 1)
3396	\| type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3397	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
3398	// handles default int return type, OBSOLESCENT (see 1)
3399	\| declaration_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3400	{ $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
3401	// handles default int return type, OBSOLESCENT (see 1)
3402	\| declaration_qualifier_list type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3403	{ $$ = $3->addOldDeclList( $4 )->addFunctionBody( $6, $5 )->addQualifiers( $2 )->addQualifiers( $1 ); }
3404	;
3405
3406	declarator:
3407	variable_declarator
3408	\| variable_type_redeclarator
3409	\| function_declarator
3410	\| function_type_redeclarator
3411	;
3412
3413	subrange:
3414	constant_expression '~' constant_expression // CFA, integer subrange
3415	{ $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
3416	;
3417
3418	// ************************** ASM ***************************
3419
3420	asm_name_opt: // GCC
3421	// empty
3422	{ $$ = nullptr; }
3423	\| ASM '(' string_literal ')' attribute_list_opt
3424	{
3425	DeclarationNode * name = new DeclarationNode();
3426	name->asmName = maybeMoveBuild( $3 );
3427	$$ = name->addQualifiers( $5 );
3428	}
3429	;
3430
3431	// ************************** ATTRIBUTE ***************************
3432
3433	attribute_list_opt: // GCC
3434	// empty
3435	{ $$ = nullptr; }
3436	\| attribute_list
3437	;
3438
3439	attribute_list: // GCC
3440	attribute
3441	\| attribute_list attribute
3442	{ $$ = $2->addQualifiers( $1 ); }
3443	;
3444
3445	attribute: // GCC
3446	ATTRIBUTE '(' '(' attribute_name_list ')' ')'
3447	{ $$ = $4; }
3448	\| ATTRIBUTE '(' attribute_name_list ')' // CFA
3449	{ $$ = $3; }
3450	\| ATTR '(' attribute_name_list ')' // CFA
3451	{ $$ = $3; }
3452	;
3453
3454	attribute_name_list: // GCC
3455	attribute_name
3456	\| attribute_name_list ',' attribute_name
3457	{ $$ = $3->addQualifiers( $1 ); }
3458	;
3459
3460	attribute_name: // GCC
3461	// empty
3462	{ $$ = nullptr; }
3463	\| attr_name
3464	{ $$ = DeclarationNode::newAttribute( $1 ); }
3465	\| attr_name '(' argument_expression_list_opt ')'
3466	{ $$ = DeclarationNode::newAttribute( $1, $3 ); }
3467	;
3468
3469	attr_name: // GCC
3470	IDENTIFIER
3471	\| quasi_keyword
3472	\| TYPEDEFname
3473	\| TYPEGENname
3474	\| FALLTHROUGH
3475	{ $$ = Token{ new string( "fallthrough" ), { nullptr, -1 } }; }
3476	\| CONST
3477	{ $$ = Token{ new string( "__const__" ), { nullptr, -1 } }; }
3478	;
3479
3480	// ============================================================================
3481	// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
3482	// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
3483	// in:
3484	//
3485	// int (*f())[10] { ... };
3486	// ... (*f())[3] += 1; // definition mimics usage
3487	//
3488	// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
3489	// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
3490	// ============================================================================
3491
3492	// ----------------------------------------------------------------------------
3493	// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
3494	// to define a variable or function prototype, e.g.:
3495	//
3496	// valid declaration invalid definition
3497	// ----------------- ------------------
3498	// int f; int f {}
3499	// int f; int f {}
3500	// int f[10]; int f[10] {}
3501	// int (f)(int); int (f)(int) {}
3502	//
3503	// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
3504	// variable_declarator and function_declarator.
3505	// ----------------------------------------------------------------------------
3506
3507	// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
3508	// declaring an array of functions versus a pointer to an array of functions.
3509
3510	paren_identifier:
3511	identifier_at
3512	{ $$ = DeclarationNode::newName( $1 ); }
3513	\| '(' paren_identifier ')' // redundant parenthesis
3514	{ $$ = $2; }
3515	;
3516
3517	variable_declarator:
3518	paren_identifier attribute_list_opt
3519	{ $$ = $1->addQualifiers( $2 ); }
3520	\| variable_ptr
3521	\| variable_array attribute_list_opt
3522	{ $$ = $1->addQualifiers( $2 ); }
3523	\| variable_function attribute_list_opt
3524	{ $$ = $1->addQualifiers( $2 ); }
3525	;
3526
3527	variable_ptr:
3528	ptrref_operator variable_declarator
3529	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3530	\| ptrref_operator type_qualifier_list variable_declarator
3531	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3532	\| '(' variable_ptr ')' attribute_list_opt // redundant parenthesis
3533	{ $$ = $2->addQualifiers( $4 ); }
3534	\| '(' attribute_list variable_ptr ')' attribute_list_opt // redundant parenthesis
3535	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3536	;
3537
3538	variable_array:
3539	paren_identifier array_dimension
3540	{ $$ = $1->addArray( $2 ); }
3541	\| '(' variable_ptr ')' array_dimension
3542	{ $$ = $2->addArray( $4 ); }
3543	\| '(' attribute_list variable_ptr ')' array_dimension
3544	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3545	\| '(' variable_array ')' multi_array_dimension // redundant parenthesis
3546	{ $$ = $2->addArray( $4 ); }
3547	\| '(' attribute_list variable_array ')' multi_array_dimension // redundant parenthesis
3548	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3549	\| '(' variable_array ')' // redundant parenthesis
3550	{ $$ = $2; }
3551	\| '(' attribute_list variable_array ')' // redundant parenthesis
3552	{ $$ = $3->addQualifiers( $2 ); }
3553	;
3554
3555	variable_function:
3556	'(' variable_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3557	{ $$ = $2->addParamList( $5 ); }
3558	\| '(' attribute_list variable_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3559	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3560	\| '(' variable_function ')' // redundant parenthesis
3561	{ $$ = $2; }
3562	\| '(' attribute_list variable_function ')' // redundant parenthesis
3563	{ $$ = $3->addQualifiers( $2 ); }
3564	;
3565
3566	// This pattern parses a function declarator that is not redefining a typedef name. For non-nested functions, there is
3567	// no context where a function definition can redefine a typedef name, i.e., the typedef and function name cannot exist
3568	// is the same scope. The pattern precludes returning arrays and functions versus pointers to arrays and functions.
3569
3570	function_declarator:
3571	function_no_ptr attribute_list_opt
3572	{ $$ = $1->addQualifiers( $2 ); }
3573	\| function_ptr
3574	\| function_array attribute_list_opt
3575	{ $$ = $1->addQualifiers( $2 ); }
3576	;
3577
3578	function_no_ptr:
3579	paren_identifier '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3580	{ $$ = $1->addParamList( $3 ); }
3581	\| '(' function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3582	{ $$ = $2->addParamList( $5 ); }
3583	\| '(' attribute_list function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3584	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3585	\| '(' function_no_ptr ')' // redundant parenthesis
3586	{ $$ = $2; }
3587	\| '(' attribute_list function_no_ptr ')' // redundant parenthesis
3588	{ $$ = $3->addQualifiers( $2 ); }
3589	;
3590
3591	function_ptr:
3592	ptrref_operator function_declarator
3593	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3594	\| ptrref_operator type_qualifier_list function_declarator
3595	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3596	\| '(' function_ptr ')' attribute_list_opt
3597	{ $$ = $2->addQualifiers( $4 ); }
3598	\| '(' attribute_list function_ptr ')' attribute_list_opt
3599	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3600	;
3601
3602	function_array:
3603	'(' function_ptr ')' array_dimension
3604	{ $$ = $2->addArray( $4 ); }
3605	\| '(' attribute_list function_ptr ')' array_dimension
3606	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3607	\| '(' function_array ')' multi_array_dimension // redundant parenthesis
3608	{ $$ = $2->addArray( $4 ); }
3609	\| '(' attribute_list function_array ')' multi_array_dimension // redundant parenthesis
3610	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3611	\| '(' function_array ')' // redundant parenthesis
3612	{ $$ = $2; }
3613	\| '(' attribute_list function_array ')' // redundant parenthesis
3614	{ $$ = $3->addQualifiers( $2 ); }
3615	;
3616
3617	// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4)
3618	//
3619	// f( a, b, c ) int a, *b, c[]; {}
3620	//
3621	// that is not redefining a typedef name (see function_declarator for additional comments). The pattern precludes
3622	// returning arrays and functions versus pointers to arrays and functions.
3623
3624	KR_function_declarator:
3625	KR_function_no_ptr
3626	\| KR_function_ptr
3627	\| KR_function_array
3628	;
3629
3630	KR_function_no_ptr:
3631	paren_identifier '(' identifier_list ')' // function_declarator handles empty parameter
3632	{ $$ = $1->addIdList( $3 ); }
3633	\| '(' KR_function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3634	{ $$ = $2->addParamList( $5 ); }
3635	\| '(' attribute_list KR_function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3636	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3637	\| '(' KR_function_no_ptr ')' // redundant parenthesis
3638	{ $$ = $2; }
3639	\| '(' attribute_list KR_function_no_ptr ')' // redundant parenthesis
3640	{ $$ = $3->addQualifiers( $2 ); }
3641	;
3642
3643	KR_function_ptr:
3644	ptrref_operator KR_function_declarator
3645	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3646	\| ptrref_operator type_qualifier_list KR_function_declarator
3647	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3648	\| '(' KR_function_ptr ')'
3649	{ $$ = $2; }
3650	\| '(' attribute_list KR_function_ptr ')'
3651	{ $$ = $3->addQualifiers( $2 ); }
3652	;
3653
3654	KR_function_array:
3655	'(' KR_function_ptr ')' array_dimension
3656	{ $$ = $2->addArray( $4 ); }
3657	\| '(' attribute_list KR_function_ptr ')' array_dimension
3658	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3659	\| '(' KR_function_array ')' multi_array_dimension // redundant parenthesis
3660	{ $$ = $2->addArray( $4 ); }
3661	\| '(' attribute_list KR_function_array ')' multi_array_dimension // redundant parenthesis
3662	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3663	\| '(' KR_function_array ')' // redundant parenthesis
3664	{ $$ = $2; }
3665	\| '(' attribute_list KR_function_array ')' // redundant parenthesis
3666	{ $$ = $3->addQualifiers( $2 ); }
3667	;
3668
3669	// This pattern parses a declaration for a variable that redefines a type name, e.g.:
3670	//
3671	// typedef int foo;
3672	// {
3673	// int foo; // redefine typedef name in new scope
3674	// }
3675
3676	paren_type:
3677	typedef_name
3678	{
3679	// hide type name in enclosing scope by variable name
3680	typedefTable.addToEnclosingScope( *$1->name, IDENTIFIER, "paren_type" );
3681	}
3682	\| '(' paren_type ')'
3683	{ $$ = $2; }
3684	;
3685
3686	variable_type_redeclarator:
3687	paren_type attribute_list_opt
3688	{ $$ = $1->addQualifiers( $2 ); }
3689	\| variable_type_ptr
3690	\| variable_type_array attribute_list_opt
3691	{ $$ = $1->addQualifiers( $2 ); }
3692	\| variable_type_function attribute_list_opt
3693	{ $$ = $1->addQualifiers( $2 ); }
3694	;
3695
3696	variable_type_ptr:
3697	ptrref_operator variable_type_redeclarator
3698	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3699	\| ptrref_operator type_qualifier_list variable_type_redeclarator
3700	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3701	\| '(' variable_type_ptr ')' attribute_list_opt // redundant parenthesis
3702	{ $$ = $2->addQualifiers( $4 ); }
3703	\| '(' attribute_list variable_type_ptr ')' attribute_list_opt // redundant parenthesis
3704	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3705	;
3706
3707	variable_type_array:
3708	paren_type array_dimension
3709	{ $$ = $1->addArray( $2 ); }
3710	\| '(' variable_type_ptr ')' array_dimension
3711	{ $$ = $2->addArray( $4 ); }
3712	\| '(' attribute_list variable_type_ptr ')' array_dimension
3713	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3714	\| '(' variable_type_array ')' multi_array_dimension // redundant parenthesis
3715	{ $$ = $2->addArray( $4 ); }
3716	\| '(' attribute_list variable_type_array ')' multi_array_dimension // redundant parenthesis
3717	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3718	\| '(' variable_type_array ')' // redundant parenthesis
3719	{ $$ = $2; }
3720	\| '(' attribute_list variable_type_array ')' // redundant parenthesis
3721	{ $$ = $3->addQualifiers( $2 ); }
3722	;
3723
3724	variable_type_function:
3725	'(' variable_type_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3726	{ $$ = $2->addParamList( $5 ); }
3727	\| '(' attribute_list variable_type_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3728	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3729	\| '(' variable_type_function ')' // redundant parenthesis
3730	{ $$ = $2; }
3731	\| '(' attribute_list variable_type_function ')' // redundant parenthesis
3732	{ $$ = $3->addQualifiers( $2 ); }
3733	;
3734
3735	// This pattern parses a declaration for a function prototype that redefines a type name. It precludes declaring an
3736	// array of functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to
3737	// arrays and functions.
3738
3739	function_type_redeclarator:
3740	function_type_no_ptr attribute_list_opt
3741	{ $$ = $1->addQualifiers( $2 ); }
3742	\| function_type_ptr
3743	\| function_type_array attribute_list_opt
3744	{ $$ = $1->addQualifiers( $2 ); }
3745	;
3746
3747	function_type_no_ptr:
3748	paren_type '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3749	{ $$ = $1->addParamList( $3 ); }
3750	\| '(' function_type_ptr ')' '(' parameter_list_ellipsis_opt ')'
3751	{ $$ = $2->addParamList( $5 ); }
3752	\| '(' attribute_list function_type_ptr ')' '(' parameter_list_ellipsis_opt ')'
3753	{ $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3754	\| '(' function_type_no_ptr ')' // redundant parenthesis
3755	{ $$ = $2; }
3756	\| '(' attribute_list function_type_no_ptr ')' // redundant parenthesis
3757	{ $$ = $3->addQualifiers( $2 ); }
3758	;
3759
3760	function_type_ptr:
3761	ptrref_operator function_type_redeclarator
3762	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3763	\| ptrref_operator type_qualifier_list function_type_redeclarator
3764	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3765	\| '(' function_type_ptr ')' attribute_list_opt
3766	{ $$ = $2->addQualifiers( $4 ); }
3767	\| '(' attribute_list function_type_ptr ')' attribute_list_opt
3768	{ $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3769	;
3770
3771	function_type_array:
3772	'(' function_type_ptr ')' array_dimension
3773	{ $$ = $2->addArray( $4 ); }
3774	\| '(' attribute_list function_type_ptr ')' array_dimension
3775	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3776	\| '(' function_type_array ')' multi_array_dimension // redundant parenthesis
3777	{ $$ = $2->addArray( $4 ); }
3778	\| '(' attribute_list function_type_array ')' multi_array_dimension // redundant parenthesis
3779	{ $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3780	\| '(' function_type_array ')' // redundant parenthesis
3781	{ $$ = $2; }
3782	\| '(' attribute_list function_type_array ')' // redundant parenthesis
3783	{ $$ = $3->addQualifiers( $2 ); }
3784	;
3785
3786	// This pattern parses a declaration for a parameter variable of a function prototype or actual that is not redefining a
3787	// typedef name and allows the C99 array options, which can only appear in a parameter list. The pattern precludes
3788	// declaring an array of functions versus a pointer to an array of functions, and returning arrays and functions versus
3789	// pointers to arrays and functions.
3790
3791	identifier_parameter_declarator:
3792	paren_identifier attribute_list_opt
3793	{ $$ = $1->addQualifiers( $2 ); }
3794	\| '&' MUTEX paren_identifier attribute_list_opt
3795	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newFromTypeData( build_type_qualifier( ast::CV::Mutex ) ),
3796	OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3797	\| identifier_parameter_ptr
3798	\| identifier_parameter_array attribute_list_opt
3799	{ $$ = $1->addQualifiers( $2 ); }
3800	\| identifier_parameter_function attribute_list_opt
3801	{ $$ = $1->addQualifiers( $2 ); }
3802	;
3803
3804	identifier_parameter_ptr:
3805	ptrref_operator identifier_parameter_declarator
3806	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3807	\| ptrref_operator type_qualifier_list identifier_parameter_declarator
3808	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3809	\| '(' identifier_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3810	{ $$ = $2->addQualifiers( $4 ); }
3811	;
3812
3813	identifier_parameter_array:
3814	paren_identifier array_parameter_dimension
3815	{ $$ = $1->addArray( $2 ); }
3816	\| '(' identifier_parameter_ptr ')' array_dimension
3817	{ $$ = $2->addArray( $4 ); }
3818	\| '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
3819	{ $$ = $2->addArray( $4 ); }
3820	\| '(' identifier_parameter_array ')' // redundant parenthesis
3821	{ $$ = $2; }
3822	;
3823
3824	identifier_parameter_function:
3825	paren_identifier '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3826	{ $$ = $1->addParamList( $3 ); }
3827	\| '(' identifier_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3828	{ $$ = $2->addParamList( $5 ); }
3829	\| '(' identifier_parameter_function ')' // redundant parenthesis
3830	{ $$ = $2; }
3831	;
3832
3833	// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
3834	// e.g.:
3835	//
3836	// typedef int foo;
3837	// forall( otype T ) struct foo;
3838	// int f( int foo ); // redefine typedef name in new scope
3839	//
3840	// and allows the C99 array options, which can only appear in a parameter list.
3841
3842	type_parameter_redeclarator:
3843	typedef_name attribute_list_opt
3844	{ $$ = $1->addQualifiers( $2 ); }
3845	\| '&' MUTEX typedef_name attribute_list_opt
3846	{ $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newFromTypeData( build_type_qualifier( ast::CV::Mutex ) ),
3847	OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3848	\| type_parameter_ptr
3849	\| type_parameter_array attribute_list_opt
3850	{ $$ = $1->addQualifiers( $2 ); }
3851	\| type_parameter_function attribute_list_opt
3852	{ $$ = $1->addQualifiers( $2 ); }
3853	;
3854
3855	typedef_name:
3856	TYPEDEFname
3857	{ $$ = DeclarationNode::newName( $1 ); }
3858	\| TYPEGENname
3859	{ $$ = DeclarationNode::newName( $1 ); }
3860	;
3861
3862	type_parameter_ptr:
3863	ptrref_operator type_parameter_redeclarator
3864	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3865	\| ptrref_operator type_qualifier_list type_parameter_redeclarator
3866	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3867	\| '(' type_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3868	{ $$ = $2->addQualifiers( $4 ); }
3869	;
3870
3871	type_parameter_array:
3872	typedef_name array_parameter_dimension
3873	{ $$ = $1->addArray( $2 ); }
3874	\| '(' type_parameter_ptr ')' array_parameter_dimension
3875	{ $$ = $2->addArray( $4 ); }
3876	;
3877
3878	type_parameter_function:
3879	typedef_name '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3880	{ $$ = $1->addParamList( $3 ); }
3881	\| '(' type_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3882	{ $$ = $2->addParamList( $5 ); }
3883	;
3884
3885	// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
3886	// which the type applies, e.g.:
3887	//
3888	// sizeof( int );
3889	// sizeof( int * );
3890	// sizeof( int [10] );
3891	// sizeof( int (*)() );
3892	// sizeof( int () );
3893	//
3894	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3895	// and functions versus pointers to arrays and functions.
3896
3897	abstract_declarator:
3898	abstract_ptr
3899	\| abstract_array attribute_list_opt
3900	{ $$ = $1->addQualifiers( $2 ); }
3901	\| abstract_function attribute_list_opt
3902	{ $$ = $1->addQualifiers( $2 ); }
3903	;
3904
3905	abstract_ptr:
3906	ptrref_operator
3907	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
3908	\| ptrref_operator type_qualifier_list
3909	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
3910	\| ptrref_operator abstract_declarator
3911	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3912	\| ptrref_operator type_qualifier_list abstract_declarator
3913	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3914	\| '(' abstract_ptr ')' attribute_list_opt
3915	{ $$ = $2->addQualifiers( $4 ); }
3916	;
3917
3918	abstract_array:
3919	array_dimension
3920	\| '(' abstract_ptr ')' array_dimension
3921	{ $$ = $2->addArray( $4 ); }
3922	\| '(' abstract_array ')' multi_array_dimension // redundant parenthesis
3923	{ $$ = $2->addArray( $4 ); }
3924	\| '(' abstract_array ')' // redundant parenthesis
3925	{ $$ = $2; }
3926	;
3927
3928	abstract_function:
3929	'(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3930	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $2, nullptr ); }
3931	\| '(' abstract_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3932	{ $$ = $2->addParamList( $5 ); }
3933	\| '(' abstract_function ')' // redundant parenthesis
3934	{ $$ = $2; }
3935	;
3936
3937	array_dimension:
3938	// Only the first dimension can be empty.
3939	'[' ']'
3940	{ $$ = DeclarationNode::newArray( nullptr, nullptr, false ); }
3941	\| '[' ']' multi_array_dimension
3942	{ $$ = DeclarationNode::newArray( nullptr, nullptr, false )->addArray( $3 ); }
3943	// Cannot use constant_expression because of tuples => semantic check
3944	\| '[' push assignment_expression pop ',' comma_expression ']' // CFA
3945	{ $$ = DeclarationNode::newArray( $3, nullptr, false )->addArray( DeclarationNode::newArray( $6, nullptr, false ) ); }
3946	// { SemanticError( yylloc, "New array dimension is currently unimplemented." ); $$ = nullptr; }
3947
3948	// If needed, the following parses and does not use comma_expression, so the array structure can be built.
3949	// \| '[' push assignment_expression pop ',' push array_dimension_list pop ']' // CFA
3950
3951	\| '[' push array_type_list pop ']' // CFA
3952	{ $$ = DeclarationNode::newArray( $3, nullptr, false ); }
3953	\| multi_array_dimension
3954	;
3955
3956	// array_dimension_list:
3957	// assignment_expression
3958	// \| array_dimension_list ',' assignment_expression
3959	// ;
3960
3961	array_type_list:
3962	basic_type_name
3963	{ $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3964	\| type_name
3965	{ $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3966	\| assignment_expression upupeq assignment_expression
3967	\| array_type_list ',' basic_type_name
3968	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) )); }
3969	\| array_type_list ',' type_name
3970	{ $$ = (ExpressionNode *)($1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) )); }
3971	\| array_type_list ',' assignment_expression upupeq assignment_expression
3972	;
3973
3974	upupeq:
3975	'~'
3976	{ $$ = OperKinds::LThan; }
3977	\| ErangeUpEq
3978	{ $$ = OperKinds::LEThan; }
3979	;
3980
3981	multi_array_dimension:
3982	'[' push assignment_expression pop ']'
3983	{ $$ = DeclarationNode::newArray( $3, nullptr, false ); }
3984	\| '[' push '*' pop ']' // C99
3985	{ $$ = DeclarationNode::newVarArray( 0 ); }
3986	\| multi_array_dimension '[' push assignment_expression pop ']'
3987	{ $$ = $1->addArray( DeclarationNode::newArray( $4, nullptr, false ) ); }
3988	\| multi_array_dimension '[' push '*' pop ']' // C99
3989	{ $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
3990	;
3991
3992	// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
3993	// identifier to which the type applies, e.g.:
3994	//
3995	// int f( int ); // not handled here
3996	// int f( int * ); // abstract function-prototype parameter; no parameter name specified
3997	// int f( int (*)() ); // abstract function-prototype parameter; no parameter name specified
3998	// int f( int (int) ); // abstract function-prototype parameter; no parameter name specified
3999	//
4000	// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
4001	// and functions versus pointers to arrays and functions. In addition, the pattern handles the
4002	// special meaning of parenthesis around a typedef name:
4003	//
4004	// ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
4005	// parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
4006	// not as redundant parentheses around the identifier."
4007	//
4008	// For example:
4009	//
4010	// typedef float T;
4011	// int f( int ( T [5] ) ); // see abstract_parameter_declarator
4012	// int g( int ( T ( int ) ) ); // see abstract_parameter_declarator
4013	// int f( int f1( T a[5] ) ); // see identifier_parameter_declarator
4014	// int g( int g1( T g2( int p ) ) ); // see identifier_parameter_declarator
4015	//
4016	// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
4017	// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
4018	// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
4019	// functions.
4020
4021	abstract_parameter_declarator_opt:
4022	// empty
4023	{ $$ = nullptr; }
4024	\| abstract_parameter_declarator
4025	;
4026
4027	abstract_parameter_declarator:
4028	abstract_parameter_ptr
4029	\| '&' MUTEX attribute_list_opt
4030	{ $$ = DeclarationNode::newPointer( DeclarationNode::newFromTypeData( build_type_qualifier( ast::CV::Mutex ) ), OperKinds::AddressOf )->addQualifiers( $3 ); }
4031	\| abstract_parameter_array attribute_list_opt
4032	{ $$ = $1->addQualifiers( $2 ); }
4033	\| abstract_parameter_function attribute_list_opt
4034	{ $$ = $1->addQualifiers( $2 ); }
4035	;
4036
4037	abstract_parameter_ptr:
4038	ptrref_operator
4039	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
4040	\| ptrref_operator type_qualifier_list
4041	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
4042	\| ptrref_operator abstract_parameter_declarator
4043	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4044	\| ptrref_operator type_qualifier_list abstract_parameter_declarator
4045	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
4046	\| '(' abstract_parameter_ptr ')' attribute_list_opt // redundant parenthesis
4047	{ $$ = $2->addQualifiers( $4 ); }
4048	;
4049
4050	abstract_parameter_array:
4051	array_parameter_dimension
4052	\| '(' abstract_parameter_ptr ')' array_parameter_dimension
4053	{ $$ = $2->addArray( $4 ); }
4054	\| '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
4055	{ $$ = $2->addArray( $4 ); }
4056	\| '(' abstract_parameter_array ')' // redundant parenthesis
4057	{ $$ = $2; }
4058	;
4059
4060	abstract_parameter_function:
4061	'(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4062	{ $$ = DeclarationNode::newFunction( nullptr, nullptr, $2, nullptr ); }
4063	\| '(' abstract_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4064	{ $$ = $2->addParamList( $5 ); }
4065	\| '(' abstract_parameter_function ')' // redundant parenthesis
4066	{ $$ = $2; }
4067	;
4068
4069	array_parameter_dimension:
4070	// Only the first dimension can be empty or have qualifiers.
4071	array_parameter_1st_dimension
4072	\| array_parameter_1st_dimension multi_array_dimension
4073	{ $$ = $1->addArray( $2 ); }
4074	\| multi_array_dimension
4075	;
4076
4077	// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
4078	//
4079	// ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
4080	// a declaration of a function parameter with an array type, and then only in the outermost array type derivation."
4081
4082	array_parameter_1st_dimension:
4083	'[' ']'
4084	{ $$ = DeclarationNode::newArray( nullptr, nullptr, false ); }
4085	// multi_array_dimension handles the '[' '*' ']' case
4086	\| '[' push type_qualifier_list '*' pop ']' // remaining C99
4087	{ $$ = DeclarationNode::newVarArray( $3 ); }
4088	\| '[' push type_qualifier_list pop ']'
4089	{ $$ = DeclarationNode::newArray( nullptr, $3, false ); }
4090	// multi_array_dimension handles the '[' assignment_expression ']' case
4091	\| '[' push type_qualifier_list assignment_expression pop ']'
4092	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
4093	\| '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
4094	{ $$ = DeclarationNode::newArray( $5, $4, true ); }
4095	\| '[' push type_qualifier_list STATIC assignment_expression pop ']'
4096	{ $$ = DeclarationNode::newArray( $5, $3, true ); }
4097	;
4098
4099	// This pattern parses a declaration of an abstract variable, but does not allow "int ()" for a function pointer.
4100	//
4101	// struct S {
4102	// int;
4103	// int *;
4104	// int [10];
4105	// int (*)();
4106	// };
4107
4108	variable_abstract_declarator:
4109	variable_abstract_ptr
4110	\| variable_abstract_array attribute_list_opt
4111	{ $$ = $1->addQualifiers( $2 ); }
4112	\| variable_abstract_function attribute_list_opt
4113	{ $$ = $1->addQualifiers( $2 ); }
4114	;
4115
4116	variable_abstract_ptr:
4117	ptrref_operator
4118	{ $$ = DeclarationNode::newPointer( nullptr, $1 ); }
4119	\| ptrref_operator type_qualifier_list
4120	{ $$ = DeclarationNode::newPointer( $2, $1 ); }
4121	\| ptrref_operator variable_abstract_declarator
4122	{ $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4123	\| ptrref_operator type_qualifier_list variable_abstract_declarator
4124	{ $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
4125	\| '(' variable_abstract_ptr ')' attribute_list_opt // redundant parenthesis
4126	{ $$ = $2->addQualifiers( $4 ); }
4127	;
4128
4129	variable_abstract_array:
4130	array_dimension
4131	\| '(' variable_abstract_ptr ')' array_dimension
4132	{ $$ = $2->addArray( $4 ); }
4133	\| '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
4134	{ $$ = $2->addArray( $4 ); }
4135	\| '(' variable_abstract_array ')' // redundant parenthesis
4136	{ $$ = $2; }
4137	;
4138
4139	variable_abstract_function:
4140	'(' variable_abstract_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4141	{ $$ = $2->addParamList( $5 ); }
4142	\| '(' variable_abstract_function ')' // redundant parenthesis
4143	{ $$ = $2; }
4144	;
4145
4146	// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
4147	// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.
4148
4149	cfa_identifier_parameter_declarator_tuple: // CFA
4150	cfa_identifier_parameter_declarator_no_tuple
4151	\| cfa_abstract_tuple
4152	\| type_qualifier_list cfa_abstract_tuple
4153	{ $$ = $2->addQualifiers( $1 ); }
4154	;
4155
4156	cfa_identifier_parameter_declarator_no_tuple: // CFA
4157	cfa_identifier_parameter_ptr
4158	\| cfa_identifier_parameter_array
4159	;
4160
4161	cfa_identifier_parameter_ptr: // CFA
4162	// No SUE declaration in parameter list.
4163	ptrref_operator type_specifier_nobody
4164	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4165	\| type_qualifier_list ptrref_operator type_specifier_nobody
4166	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4167	\| ptrref_operator cfa_abstract_function
4168	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4169	\| type_qualifier_list ptrref_operator cfa_abstract_function
4170	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4171	\| ptrref_operator cfa_identifier_parameter_declarator_tuple
4172	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4173	\| type_qualifier_list ptrref_operator cfa_identifier_parameter_declarator_tuple
4174	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4175	;
4176
4177	cfa_identifier_parameter_array: // CFA
4178	// Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
4179	// shift/reduce conflict with new-style empty (void) function return type.
4180	'[' ']' type_specifier_nobody
4181	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4182	\| cfa_array_parameter_1st_dimension type_specifier_nobody
4183	{ $$ = $2->addNewArray( $1 ); }
4184	\| '[' ']' multi_array_dimension type_specifier_nobody
4185	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4186	\| cfa_array_parameter_1st_dimension multi_array_dimension type_specifier_nobody
4187	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
4188	\| multi_array_dimension type_specifier_nobody
4189	{ $$ = $2->addNewArray( $1 ); }
4190
4191	\| '[' ']' cfa_identifier_parameter_ptr
4192	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4193	\| cfa_array_parameter_1st_dimension cfa_identifier_parameter_ptr
4194	{ $$ = $2->addNewArray( $1 ); }
4195	\| '[' ']' multi_array_dimension cfa_identifier_parameter_ptr
4196	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4197	\| cfa_array_parameter_1st_dimension multi_array_dimension cfa_identifier_parameter_ptr
4198	{ $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
4199	\| multi_array_dimension cfa_identifier_parameter_ptr
4200	{ $$ = $2->addNewArray( $1 ); }
4201	;
4202
4203	cfa_array_parameter_1st_dimension:
4204	'[' push type_qualifier_list '*' pop ']' // remaining C99
4205	{ $$ = DeclarationNode::newVarArray( $3 ); }
4206	\| '[' push type_qualifier_list assignment_expression pop ']'
4207	{ $$ = DeclarationNode::newArray( $4, $3, false ); }
4208	\| '[' push declaration_qualifier_list assignment_expression pop ']'
4209	// declaration_qualifier_list must be used because of shift/reduce conflict with
4210	// assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
4211	// appear in this context.
4212	{ $$ = DeclarationNode::newArray( $4, $3, true ); }
4213	\| '[' push declaration_qualifier_list type_qualifier_list assignment_expression pop ']'
4214	{ $$ = DeclarationNode::newArray( $5, $4->addQualifiers( $3 ), true ); }
4215	;
4216
4217	// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
4218	// identifier to which the type applies, e.g.:
4219	//
4220	// [int] f( int ); // abstract variable parameter; no parameter name specified
4221	// [int] f( [int] (int) ); // abstract function-prototype parameter; no parameter name specified
4222	//
4223	// These rules need LR(3):
4224	//
4225	// cfa_abstract_tuple identifier_or_type_name
4226	// '[' cfa_parameter_list ']' identifier_or_type_name '(' cfa_parameter_list_ellipsis_opt ')'
4227	//
4228	// since a function return type can be syntactically identical to a tuple type:
4229	//
4230	// [int, int] t;
4231	// [int, int] f( int );
4232	//
4233	// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
4234	// cfa_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
4235	// lookahead. To accomplish this, cfa_abstract_declarator has an entry point without tuple, and tuple declarations are
4236	// duplicated when appearing with cfa_function_specifier.
4237
4238	cfa_abstract_declarator_tuple: // CFA
4239	cfa_abstract_tuple
4240	\| type_qualifier_list cfa_abstract_tuple
4241	{ $$ = $2->addQualifiers( $1 ); }
4242	\| cfa_abstract_declarator_no_tuple
4243	;
4244
4245	cfa_abstract_declarator_no_tuple: // CFA
4246	cfa_abstract_ptr
4247	\| cfa_abstract_array
4248	;
4249
4250	cfa_abstract_ptr: // CFA
4251	ptrref_operator type_specifier
4252	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4253	\| type_qualifier_list ptrref_operator type_specifier
4254	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4255	\| ptrref_operator cfa_abstract_function
4256	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4257	\| type_qualifier_list ptrref_operator cfa_abstract_function
4258	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4259	\| ptrref_operator cfa_abstract_declarator_tuple
4260	{ $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4261	\| type_qualifier_list ptrref_operator cfa_abstract_declarator_tuple
4262	{ $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4263	;
4264
4265	cfa_abstract_array: // CFA
4266	// Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
4267	// empty (void) function return type.
4268	'[' ']' type_specifier
4269	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4270	\| '[' ']' multi_array_dimension type_specifier
4271	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4272	\| multi_array_dimension type_specifier
4273	{ $$ = $2->addNewArray( $1 ); }
4274	\| '[' ']' cfa_abstract_ptr
4275	{ $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4276	\| '[' ']' multi_array_dimension cfa_abstract_ptr
4277	{ $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4278	\| multi_array_dimension cfa_abstract_ptr
4279	{ $$ = $2->addNewArray( $1 ); }
4280	;
4281
4282	cfa_abstract_tuple: // CFA
4283	'[' push cfa_abstract_parameter_list pop ']'
4284	{ $$ = DeclarationNode::newTuple( $3 ); }
4285	\| '[' push type_specifier_nobody ELLIPSIS pop ']'
4286	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
4287	\| '[' push type_specifier_nobody ELLIPSIS constant_expression pop ']'
4288	{ SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
4289	;
4290
4291	cfa_abstract_function: // CFA
4292	'[' ']' '(' cfa_parameter_list_ellipsis_opt ')'
4293	{ $$ = DeclarationNode::newFunction( nullptr, DeclarationNode::newTuple( nullptr ), $4, nullptr ); }
4294	\| cfa_abstract_tuple '(' push cfa_parameter_list_ellipsis_opt pop ')'
4295	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
4296	\| cfa_function_return '(' push cfa_parameter_list_ellipsis_opt pop ')'
4297	{ $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
4298	;
4299
4300	// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
4301	// each declaration, and in the specifier-qualifier list in each structure declaration and type name."
4302	//
4303	// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
4304	// the declaration specifiers in a declaration is an obsolescent feature."
4305	//
4306	// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
4307	// prototype-format parameter type declarators) is an obsolescent feature."
4308	//
4309	// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
4310	// declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.
4311
4312	// ********************** MISCELLANEOUS ******************************
4313
4314	comma_opt: // redundant comma
4315	// empty
4316	\| ','
4317	;
4318
4319	default_initializer_opt:
4320	// empty
4321	{ $$ = nullptr; }
4322	\| '=' assignment_expression
4323	{ $$ = $2; }
4324	;
4325
4326	%%
4327
4328	// ----end of grammar----
4329
4330	// Local Variables: //
4331	// mode: c++ //
4332	// tab-width: 4 //
4333	// compile-command: "bison -Wcounterexamples parser.yy" //
4334	// End: //

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