source: src/Parser/parser.yy@ 00f89a6

Last change on this file since 00f89a6 was 1a8b17a, checked in by Peter A. Buhr <pabuhr@…>, 11 months ago

add C23 attributes, require comma terminator for nullary and unary tuple (optional terminator for Nary tuples), change designator to C syntax using equal rather than colon
  • Property mode set to 100644
File size: 179.3 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 : Sun Oct 13 12:18:15 2024
13// Update Count : 6845
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>
48using namespace std;
49
50#include "DeclarationNode.hpp" // for DeclarationNode, ...
51#include "ExpressionNode.hpp" // for ExpressionNode, ...
52#include "InitializerNode.hpp" // for InitializerNode, ...
53#include "ParserTypes.hpp"
54#include "StatementNode.hpp" // for build_...
55#include "TypedefTable.hpp"
56#include "TypeData.hpp"
57#include "AST/Type.hpp" // for BasicType, BasicKind
58#include "Common/SemanticError.hpp" // error_str
59#include "Common/Utility.hpp" // for maybeMoveBuild, maybeBuild, CodeLo...
60
61// lex uses __null in a boolean context, it's fine.
62#ifdef __clang__
63#pragma GCC diagnostic ignored "-Wparentheses-equality"
64#endif
65
66extern DeclarationNode * parseTree;
67extern ast::Linkage::Spec linkage;
68extern TypedefTable typedefTable;
69
70stack<ast::Linkage::Spec> linkageStack;
71
72bool appendStr( string & to, string & from ) {
73 // 1. Multiple strings are concatenated into a single string but not combined internally. The reason is that
74 // "\x12" "3" is treated as 2 characters versus 1 because "escape sequences are converted into single members of
75 // the execution character set just prior to adjacent string literal concatenation" (C11, Section 6.4.5-8). It is
76 // easier to let the C compiler handle this case.
77 //
78 // 2. String encodings are transformed into canonical form (one encoding at start) so the encoding can be found
79 // without searching the string, e.g.: "abc" L"def" L"ghi" => L"abc" "def" "ghi". Multiple encodings must match,
80 // e.g., u"a" U"b" L"c" is disallowed.
81
82 if ( from[0] != '"' ) { // encoding ?
83 if ( to[0] != '"' ) { // encoding ?
84 if ( to[0] != from[0] || to[1] != from[1] ) { // different encodings ?
85 yyerror( "non-matching string encodings for string-literal concatenation" );
86 return false; // parse error, must call YYERROR in action
87 } else if ( from[1] == '8' ) {
88 from.erase( 0, 1 ); // remove 2nd encoding
89 } // if
90 } else {
91 if ( from[1] == '8' ) { // move encoding to start
92 to = "u8" + to;
93 from.erase( 0, 1 ); // remove 2nd encoding
94 } else {
95 to = from[0] + to;
96 } // if
97 } // if
98 from.erase( 0, 1 ); // remove 2nd encoding
99 } // if
100 to += " " + from; // concatenated into single string
101 return true;
102} // appendStr
103
104DeclarationNode * distAttr( DeclarationNode * typeSpec, DeclarationNode * declList ) {
105 // Distribute type specifier across all declared variables, e.g., static, const, __attribute__.
106 assert( declList );
107
108 // Do not distribute attributes for aggregates because the attributes surrounding the aggregate belong it not the
109 // variables in the declaration list, e.g.,
110 //
111 // struct __attribute__(( aligned(128) )) S { ...
112 // } v1 __attribute__(( aligned(64) )), v2 __attribute__(( aligned(32) )), v3;
113 // struct S v4;
114 //
115 // v1 => 64, v2 =>32, v3 => 128, v2 => 128
116 //
117 // Anonymous aggregates are a special case because there is no aggregate to bind the attribute to; hence it floats
118 // to the declaration list.
119 //
120 // struct __attribute__(( aligned(128) )) /*anonymous */ { ... } v1;
121 //
122 // v1 => 128
123
124 bool copyattr = ! (typeSpec->type && typeSpec->type->kind == TypeData::Aggregate && ! typeSpec->type->aggregate.anon );
125
126 // addType copies the type information for the aggregate instances from typeSpec into cl's aggInst.aggregate.
127 DeclarationNode * cl = (new DeclarationNode)->addType( typeSpec ); // typeSpec IS DELETED!!!
128
129 // Start at second variable in declaration list and clone the type specifiers for each variable.
130 for ( DeclarationNode * cur = declList->next ; cur != nullptr; cur = cur->next ) {
131 cl->cloneBaseType( cur, copyattr ); // cur is modified
132 } // for
133
134 // Add first variable in declaration list with hidden type information in aggInst.aggregate, which is used by
135 // extractType to recover the type for the aggregate instances.
136 declList->addType( cl, copyattr ); // cl IS DELETED!!!
137 return declList;
138} // distAttr
139
140void distExt( DeclarationNode * declaration ) {
141 // distribute EXTENSION across all declarations
142 for ( DeclarationNode *iter = declaration ; iter != nullptr ; iter = iter->next ) {
143 iter->set_extension( true );
144 } // for
145} // distExt
146
147void distInl( DeclarationNode * declaration ) {
148 // distribute INLINE across all declarations
149 for ( DeclarationNode *iter = declaration ; iter != nullptr ; iter = iter->next ) {
150 iter->set_inLine( true );
151 } // for
152} // distInl
153
154void distQual( DeclarationNode * declaration, DeclarationNode * qualifiers ) {
155 // distribute qualifiers across all non-variable declarations in a distribution statemement
156 for ( DeclarationNode * iter = declaration ; iter != nullptr ; iter = iter->next ) {
157 // SKULLDUGGERY: Distributions are parsed inside out, so qualifiers are added to declarations inside out. Since
158 // addQualifiers appends to the back of the list, the forall clauses are in the wrong order (right to left). To
159 // get the qualifiers in the correct order and still use addQualifiers (otherwise, 90% of addQualifiers has to
160 // be copied to add to front), the appropriate forall pointers are interchanged before calling addQualifiers.
161 DeclarationNode * clone = qualifiers->clone();
162 if ( qualifiers->type ) { // forall clause ? (handles SC)
163 if ( iter->type->kind == TypeData::Aggregate ) { // struct/union ?
164 swap( clone->type->forall, iter->type->aggregate.params );
165 iter->addQualifiers( clone );
166 } else if ( iter->type->kind == TypeData::AggregateInst && iter->type->aggInst.aggregate->aggregate.body ) { // struct/union ?
167 // Create temporary node to hold aggregate, call addQualifiers as above, then put nodes back together.
168 DeclarationNode newnode;
169 swap( newnode.type, iter->type->aggInst.aggregate );
170 swap( clone->type->forall, newnode.type->aggregate.params );
171 newnode.addQualifiers( clone );
172 swap( newnode.type, iter->type->aggInst.aggregate );
173 } else if ( iter->type->kind == TypeData::Function ) { // routines ?
174 swap( clone->type->forall, iter->type->forall );
175 iter->addQualifiers( clone );
176 } // if
177 } else { // just SC qualifiers
178 iter->addQualifiers( clone );
179 } // if
180 } // for
181 delete qualifiers;
182} // distQual
183
184// There is an ambiguity for inline generic-routine return-types and generic routines.
185// forall( otype T ) struct S { int i; } bar( T ) {}
186// Does the forall bind to the struct or the routine, and how would it be possible to explicitly specify the binding.
187// forall( otype T ) struct S { int T; } forall( otype W ) bar( W ) {}
188// Currently, the forall is associated with the routine, and the generic type has to be separately defined:
189// forall( otype T ) struct S { int T; };
190// forall( otype W ) bar( W ) {}
191
192void rebindForall( DeclarationNode * declSpec, DeclarationNode * funcDecl ) {
193 if ( declSpec->type->kind == TypeData::Aggregate ) { // ignore aggregate definition
194 funcDecl->type->forall = declSpec->type->aggregate.params; // move forall from aggregate to function type
195 declSpec->type->aggregate.params = nullptr;
196 } // if
197} // rebindForall
198
199string * build_postfix_name( string * name ) {
200 *name = string("__postfix_func_") + *name;
201 return name;
202} // build_postfix_name
203
204DeclarationNode * fieldDecl( DeclarationNode * typeSpec, DeclarationNode * fieldList ) {
205 if ( nullptr == fieldList ) {
206 if ( !( typeSpec->type && typeSpec->type->kind == TypeData::Aggregate ) ) {
207 stringstream ss;
208 // printf( "fieldDecl1 typeSpec %p\n", typeSpec ); typeSpec->type->print( std::cout );
209 SemanticWarning( yylloc, Warning::SuperfluousDecl, ss.str().c_str() );
210 return nullptr;
211 } // if
212 // printf( "fieldDecl2 typeSpec %p\n", typeSpec ); typeSpec->type->print( std::cout );
213 fieldList = DeclarationNode::newName( nullptr );
214 } // if
215
216 // printf( "fieldDecl3 typeSpec %p\n", typeSpec ); typeSpec->print( std::cout, 0 );
217 DeclarationNode * temp = distAttr( typeSpec, fieldList ); // mark all fields in list
218 // printf( "fieldDecl4 temp %p\n", temp ); temp->print( std::cout, 0 );
219 return temp;
220} // fieldDecl
221
222#define NEW_ZERO new ExpressionNode( build_constantInteger( yylloc, *new string( "0" ) ) )
223#define NEW_ONE new ExpressionNode( build_constantInteger( yylloc, *new string( "1" ) ) )
224#define UPDOWN( compop, left, right ) (compop == OperKinds::LThan || compop == OperKinds::LEThan ? left : right)
225#define MISSING_ANON_FIELD "illegal syntax, missing loop fields with an anonymous loop index is meaningless as loop index is unavailable in loop body."
226#define MISSING_LOW "illegal syntax, missing low value for ascanding range so index is uninitialized."
227#define MISSING_HIGH "illegal syntax, missing high value for descending range so index is uninitialized."
228
229static ForCtrl * makeForCtrl( const CodeLocation & location, DeclarationNode * init, OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
230 // Wrap both comp/inc if they are non-null.
231 if ( comp ) comp = new ExpressionNode( build_binary_val( location,
232 compop,
233 new ExpressionNode( build_varref( location, new string( *init->name ) ) ),
234 comp ) );
235 if ( inc ) inc = new ExpressionNode( build_binary_val( location,
236 // choose += or -= for upto/downto
237 compop == OperKinds::LThan || compop == OperKinds::LEThan ? OperKinds::PlusAssn : OperKinds::MinusAssn,
238 new ExpressionNode( build_varref( location, new string( *init->name ) ) ),
239 inc ) );
240 // The StatementNode call frees init->name, it must happen later.
241 return new ForCtrl( new StatementNode( init ), comp, inc );
242}
243
244ForCtrl * forCtrl( const CodeLocation & location, DeclarationNode * index, ExpressionNode * start, OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
245 if ( index->initializer ) {
246 SemanticError( yylloc, "illegal syntax, direct initialization disallowed. Use instead: type var; initialization ~ comparison ~ increment." );
247 } // if
248 if ( index->next ) {
249 SemanticError( yylloc, "illegal syntax, multiple loop indexes disallowed in for-loop declaration." );
250 } // if
251 DeclarationNode * initDecl = index->addInitializer( new InitializerNode( start ) );
252 return makeForCtrl( location, initDecl, compop, comp, inc );
253} // forCtrl
254
255ForCtrl * forCtrl( const CodeLocation & location, ExpressionNode * type, string * index, ExpressionNode * start, OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
256 ast::ConstantExpr * constant = dynamic_cast<ast::ConstantExpr *>(type->expr.get());
257 if ( constant && (constant->rep == "0" || constant->rep == "1") ) {
258 type = new ExpressionNode( new ast::CastExpr( location, maybeMoveBuild(type), new ast::BasicType( ast::BasicKind::SignedInt ) ) );
259 } // if
260 DeclarationNode * initDecl = distAttr(
261 DeclarationNode::newTypeof( type, true ),
262 DeclarationNode::newName( index )->addInitializer( new InitializerNode( start ) )
263 );
264 return makeForCtrl( location, initDecl, compop, comp, inc );
265} // forCtrl
266
267#define MISSING_LOOP_INDEX "illegal syntax, only a single identifier or declaration allowed in initialization, e.g., for ( i; ... ) or for ( int i; ... ). Expression disallowed."
268
269ForCtrl * forCtrl( const CodeLocation & location, ExpressionNode * type, ExpressionNode * index, ExpressionNode * start, OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
270 if ( auto identifier = dynamic_cast<ast::NameExpr *>(index->expr.get()) ) {
271 return forCtrl( location, type, new string( identifier->name ), start, compop, comp, inc );
272 } else {
273 SemanticError( yylloc, MISSING_LOOP_INDEX ); return nullptr;
274 } // if
275} // forCtrl
276
277ForCtrl * enumRangeCtrl( ExpressionNode * index_expr, OperKinds compop, ExpressionNode * range_over_expr, DeclarationNode * type ) {
278 assert( compop == OperKinds::LEThan || compop == OperKinds::GEThan );
279 if ( auto identifier = dynamic_cast<ast::NameExpr *>(index_expr->expr.get()) ) {
280 DeclarationNode * indexDecl =
281 DeclarationNode::newName( new std::string(identifier->name) )->addType( type );
282 return new ForCtrl( new StatementNode( indexDecl ), range_over_expr, compop );
283 } else {
284 SemanticError( yylloc, MISSING_LOOP_INDEX ); return nullptr;
285 } // if
286} // enumRangeCtrl
287
288static void IdentifierBeforeIdentifier( string & identifier1, string & identifier2, const char * kind ) {
289 SemanticError( yylloc, "illegal syntax, adjacent identifiers \"%s\" and \"%s\" are not meaningful in an %s.\n"
290 "Possible cause is misspelled type name or missing generic parameter.",
291 identifier1.c_str(), identifier2.c_str(), kind );
292} // IdentifierBeforeIdentifier
293
294static void IdentifierBeforeType( string & identifier, const char * kind ) {
295 SemanticError( yylloc, "illegal syntax, identifier \"%s\" cannot appear before a %s.\n"
296 "Possible cause is misspelled storage/CV qualifier, misspelled typename, or missing generic parameter.",
297 identifier.c_str(), kind );
298} // IdentifierBeforeType
299
300bool forall = false; // aggregate have one or more forall qualifiers ?
301
302// https://www.gnu.org/software/bison/manual/bison.html#Location-Type
303#define YYLLOC_DEFAULT(Cur, Rhs, N) \
304if ( N ) { \
305 (Cur).first_line = YYRHSLOC( Rhs, 1 ).first_line; \
306 (Cur).first_column = YYRHSLOC( Rhs, 1 ).first_column; \
307 (Cur).last_line = YYRHSLOC( Rhs, N ).last_line; \
308 (Cur).last_column = YYRHSLOC( Rhs, N ).last_column; \
309 (Cur).filename = YYRHSLOC( Rhs, 1 ).filename; \
310} else { \
311 (Cur).first_line = (Cur).last_line = YYRHSLOC( Rhs, 0 ).last_line; \
312 (Cur).first_column = (Cur).last_column = YYRHSLOC( Rhs, 0 ).last_column; \
313 (Cur).filename = YYRHSLOC( Rhs, 0 ).filename; \
314}
315%}
316
317%define parse.error verbose
318
319// Types declaration for productions
320
321%union {
322 // A raw token can be used.
323 Token tok;
324
325 // The general node types hold some generic node or list of nodes.
326 DeclarationNode * decl;
327 InitializerNode * init;
328 ExpressionNode * expr;
329 StatementNode * stmt;
330 ClauseNode * clause;
331 TypeData * type;
332
333 // Special "nodes" containing compound information.
334 CondCtrl * ifctrl;
335 ForCtrl * forctrl;
336 LabelNode * labels;
337
338 // Various flags and single values that become fields later.
339 ast::AggregateDecl::Aggregate aggKey;
340 ast::TypeDecl::Kind tclass;
341 OperKinds oper;
342 bool is_volatile;
343 EnumHiding enum_hiding;
344 ast::ExceptionKind except_kind;
345 // String passes ownership with it.
346 std::string * str;
347
348 // Narrower node types are used to avoid constant unwrapping.
349 ast::WaitForStmt * wfs;
350 ast::WaitUntilStmt::ClauseNode * wucn;
351 ast::GenericExpr * genexpr;
352}
353
354// ************************ TERMINAL TOKENS ********************************
355
356// keywords
357%token TYPEDEF
358%token EXTERN STATIC AUTO REGISTER
359%token THREADLOCALGCC THREADLOCALC11 // GCC, C11
360%token INLINE FORTRAN // C99, extension ISO/IEC 9899:1999 Section J.5.9(1)
361%token NORETURN // C11
362%token CONST VOLATILE
363%token RESTRICT // C99
364%token ATOMIC // C11
365%token FORALL MUTEX VIRTUAL VTABLE COERCE // CFA
366%token VOID CHAR SHORT INT LONG FLOAT DOUBLE SIGNED UNSIGNED
367%token BOOL COMPLEX IMAGINARY // C99
368%token INT128 UINT128 FLOAT80 uuFLOAT128 // GCC
369%token FLOAT16 FLOAT32 FLOAT32X FLOAT64 FLOAT64X FLOAT128 FLOAT128X // GCC
370%token FLOAT32X4 FLOAT64X2 SVFLOAT32 SVFLOAT64 SVBOOL // GCC (ARM)
371%token DECIMAL32 DECIMAL64 DECIMAL128 // GCC
372%token ZERO_T ONE_T // CFA
373%token SIZEOF TYPEOF VA_LIST VA_ARG AUTO_TYPE COUNTOF // GCC
374%token OFFSETOF BASETYPEOF TYPEID // CFA
375%token ENUM STRUCT UNION
376%token EXCEPTION // CFA
377%token GENERATOR COROUTINE MONITOR THREAD // CFA
378%token OTYPE FTYPE DTYPE TTYPE TRAIT // CFA
379// %token RESUME // CFA
380%token LABEL // GCC
381%token SUSPEND // CFA
382%token ATTRIBUTE EXTENSION // GCC
383%token IF ELSE SWITCH CASE DEFAULT DO WHILE FOR BREAK CONTINUE GOTO RETURN
384%token CHOOSE FALLTHRU FALLTHROUGH WITH WHEN WAITFOR WAITUNTIL // CFA
385%token CORUN COFOR
386%token DISABLE ENABLE TRY THROW THROWRESUME AT // CFA
387%token ASM // C99, extension ISO/IEC 9899:1999 Section J.5.10(1)
388%token ALIGNAS ALIGNOF GENERIC STATICASSERT // C11
389
390// names and constants: lexer differentiates between identifier and typedef names
391%token<tok> IDENTIFIER TYPEDIMname TYPEDEFname TYPEGENname
392%token<tok> TIMEOUT WAND WOR CATCH RECOVER CATCHRESUME FIXUP FINALLY // CFA
393%token<tok> INTEGERconstant CHARACTERconstant STRINGliteral
394%token<tok> DIRECTIVE C23_ATTRIBUTE
395// Floating point constant is broken into three kinds of tokens because of the ambiguity with tuple indexing and
396// overloading constants 0/1, e.g., x.1 is lexed as (x)(.1), where (.1) is a factional constant, but is semantically
397// converted into the tuple index (.)(1). e.g., 3.x
398%token<tok> FLOATING_DECIMALconstant FLOATING_FRACTIONconstant FLOATINGconstant
399
400// multi-character operators
401%token ARROW // ->
402%token ICR DECR // ++ --
403%token LS RS // << >>
404%token LE GE EQ NE // <= >= == !=
405%token ANDAND OROR // && ||
406%token ATTR ELLIPSIS // @@ ...
407
408%token EXPassign MULTassign DIVassign MODassign // \= *= /= %=
409%token PLUSassign MINUSassign // += -=
410%token LSassign RSassign // <<= >>=
411%token ANDassign ERassign ORassign // &= ^= |=
412
413%token ErangeUp ErangeUpEq ErangeDown ErangeDownEq // +~ +~=/~= -~ -~=
414%token ATassign // @=
415
416%type<tok> identifier identifier_at identifier_or_type_name attr_name
417%type<tok> quasi_keyword
418%type<expr> string_literal
419%type<str> string_literal_list
420
421%type<enum_hiding> hide_opt visible_hide_opt
422
423// expressions
424%type<expr> constant
425%type<expr> tuple tuple_expression_list
426%type<oper> ptrref_operator unary_operator assignment_operator simple_assignment_operator compound_assignment_operator
427%type<expr> primary_expression postfix_expression unary_expression
428%type<expr> cast_expression_list cast_expression exponential_expression multiplicative_expression additive_expression
429%type<expr> shift_expression relational_expression equality_expression
430%type<expr> AND_expression exclusive_OR_expression inclusive_OR_expression
431%type<expr> logical_AND_expression logical_OR_expression
432%type<expr> conditional_expression constant_expression assignment_expression assignment_expression_opt
433%type<expr> comma_expression comma_expression_opt
434%type<expr> argument_expression_list_opt argument_expression_list argument_expression default_initializer_opt
435%type<ifctrl> conditional_declaration
436%type<forctrl> for_control_expression for_control_expression_list
437%type<oper> upupeq updown updowneq downupdowneq
438%type<expr> subrange
439%type<decl> asm_name_opt
440%type<expr> asm_operands_opt asm_operands_list asm_operand
441%type<labels> label_list
442%type<expr> asm_clobbers_list_opt
443%type<is_volatile> asm_volatile_opt
444%type<expr> handler_predicate_opt
445%type<genexpr> generic_association generic_assoc_list
446
447// statements
448%type<stmt> statement labeled_statement compound_statement
449%type<stmt> statement_decl statement_decl_list statement_list_nodecl
450%type<stmt> selection_statement
451%type<clause> switch_clause_list_opt switch_clause_list
452%type<expr> case_value
453%type<clause> case_clause case_value_list case_label case_label_list
454%type<stmt> iteration_statement jump_statement
455%type<stmt> expression_statement asm_statement
456%type<stmt> with_statement
457%type<expr> with_clause_opt
458%type<stmt> corun_statement cofor_statement
459%type<stmt> exception_statement
460%type<clause> handler_clause finally_clause
461%type<except_kind> handler_key
462%type<stmt> mutex_statement
463%type<expr> when_clause when_clause_opt waitfor waituntil timeout
464%type<stmt> waitfor_statement waituntil_statement
465%type<wfs> wor_waitfor_clause
466%type<wucn> waituntil_clause wand_waituntil_clause wor_waituntil_clause
467
468// declarations
469%type<decl> abstract_declarator abstract_ptr abstract_array abstract_function array_dimension multi_array_dimension
470%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
471%type<decl> abstract_parameter_declaration
472
473%type<aggKey> aggregate_key aggregate_data aggregate_control
474%type<decl> aggregate_type aggregate_type_nobody
475
476%type<decl> assertion assertion_list assertion_list_opt
477
478%type<expr> bit_subrange_size_opt bit_subrange_size
479
480%type<decl> basic_declaration_specifier basic_type_name basic_type_specifier direct_type indirect_type
481%type<type> basic_type_name_type
482%type<type> vtable vtable_opt default_opt
483
484%type<decl> trait_declaration trait_declaration_list trait_declaring_list trait_specifier
485
486%type<decl> declaration declaration_list declaration_list_opt declaration_qualifier_list
487%type<decl> declaration_specifier declaration_specifier_nobody declarator declaring_list
488
489%type<decl> elaborated_type elaborated_type_nobody
490
491%type<decl> enumerator_list enum_type enum_type_nobody enum_key enumerator_type
492%type<init> enumerator_value_opt
493
494%type<decl> external_definition external_definition_list external_definition_list_opt
495
496%type<decl> exception_declaration
497
498%type<decl> field_declaration_list_opt field_declaration field_declaring_list_opt field_declarator field_abstract_list_opt field_abstract
499%type<expr> field field_name_list field_name fraction_constants_opt
500
501%type<decl> external_function_definition function_definition function_array function_declarator function_no_ptr function_ptr
502
503%type<decl> identifier_parameter_declarator identifier_parameter_ptr identifier_parameter_array identifier_parameter_function
504%type<decl> identifier_list
505
506%type<decl> cfa_abstract_array cfa_abstract_declarator_no_tuple cfa_abstract_declarator_tuple
507%type<decl> cfa_abstract_function cfa_abstract_parameter_declaration cfa_abstract_parameter_list
508%type<decl> cfa_abstract_ptr cfa_abstract_tuple
509
510%type<decl> cfa_array_parameter_1st_dimension
511
512%type<decl> cfa_trait_declaring_list cfa_declaration cfa_field_declaring_list cfa_field_abstract_list
513%type<decl> cfa_function_declaration cfa_function_return cfa_function_specifier
514
515%type<decl> cfa_identifier_parameter_array cfa_identifier_parameter_declarator_no_tuple
516%type<decl> cfa_identifier_parameter_declarator_tuple cfa_identifier_parameter_ptr
517
518%type<decl> cfa_parameter_declaration cfa_parameter_list cfa_parameter_list_ellipsis_opt
519
520%type<decl> cfa_typedef_declaration cfa_variable_declaration cfa_variable_specifier
521
522%type<decl> c_declaration static_assert
523%type<decl> KR_function_declarator KR_function_no_ptr KR_function_ptr KR_function_array
524%type<decl> KR_parameter_list KR_parameter_list_opt
525
526%type<decl> parameter_declaration parameter_list parameter_list_ellipsis_opt
527
528%type<decl> paren_identifier paren_type
529
530%type<decl> storage_class storage_class_list
531
532%type<decl> sue_declaration_specifier sue_declaration_specifier_nobody sue_type_specifier sue_type_specifier_nobody
533
534%type<tclass> type_class new_type_class
535%type<decl> type_declarator type_declarator_name type_declaring_list
536
537%type<decl> type_declaration_specifier type_type_specifier
538%type<type> type_name typegen_name
539%type<decl> typedef_name typedef_declaration typedef_expression
540
541%type<decl> variable_type_redeclarator variable_type_ptr variable_type_array variable_type_function
542%type<decl> general_function_declarator function_type_redeclarator function_type_array function_type_no_ptr function_type_ptr
543
544%type<decl> type_parameter_redeclarator type_parameter_ptr type_parameter_array type_parameter_function
545
546%type<decl> type type_no_function
547%type<decl> type_parameter type_parameter_list type_initializer_opt
548
549%type<expr> type_parameters_opt type_list array_type_list // array_dimension_list
550
551%type<decl> type_qualifier forall type_qualifier_list_opt type_qualifier_list
552%type<type> type_qualifier_name
553%type<decl> type_specifier type_specifier_nobody
554
555%type<decl> variable_declarator variable_ptr variable_array variable_function
556%type<decl> variable_abstract_declarator variable_abstract_ptr variable_abstract_array variable_abstract_function
557
558%type<decl> attribute_list_opt attribute_list attribute attribute_name_list attribute_name
559
560// initializers
561%type<init> initializer initializer_list_opt initializer_opt
562
563// designators
564%type<expr> designator designator_list designation
565
566
567// Handle shift/reduce conflict for dangling else by shifting the ELSE token. For example, this string is ambiguous:
568// .---------. matches IF '(' comma_expression ')' statement . (reduce)
569// if ( C ) S1 else S2
570// `-----------------' matches IF '(' comma_expression ')' statement . (shift) ELSE statement */
571// Similar issues exit with the waitfor statement.
572
573// Order of these lines matters (low-to-high precedence). THEN is left associative over WAND/WOR/TIMEOUT/ELSE, WAND/WOR
574// is left associative over TIMEOUT/ELSE, and TIMEOUT is left associative over ELSE.
575%precedence THEN // rule precedence for IF/WAITFOR statement
576%precedence ANDAND // token precedence for start of WAND in WAITFOR statement
577%precedence WAND // token precedence for start of WAND in WAITFOR statement
578%precedence OROR // token precedence for start of WOR in WAITFOR statement
579%precedence WOR // token precedence for start of WOR in WAITFOR statement
580%precedence TIMEOUT // token precedence for start of TIMEOUT in WAITFOR statement
581%precedence CATCH // token precedence for start of TIMEOUT in WAITFOR statement
582%precedence RECOVER // token precedence for start of TIMEOUT in WAITFOR statement
583%precedence CATCHRESUME // token precedence for start of TIMEOUT in WAITFOR statement
584%precedence FIXUP // token precedence for start of TIMEOUT in WAITFOR statement
585%precedence FINALLY // token precedence for start of TIMEOUT in WAITFOR statement
586%precedence ELSE // token precedence for start of else clause in IF/WAITFOR statement
587
588
589// Handle shift/reduce conflict for generic type by shifting the '(' token. For example, this string is ambiguous:
590// forall( otype T ) struct Foo { T v; };
591// .-----. matches pointer to function returning a generic (which is impossible without a type)
592// Foo ( *fp )( int );
593// `---' matches start of TYPEGENname '('
594// must be:
595// Foo( int ) ( *fp )( int );
596// The same problem occurs here:
597// forall( otype T ) struct Foo { T v; } ( *fp )( int );
598// must be:
599// forall( otype T ) struct Foo { T v; } ( int ) ( *fp )( int );
600
601// Order of these lines matters (low-to-high precedence).
602%precedence TYPEGENname
603%precedence '}'
604%precedence '('
605
606// %precedence RESUME
607// %precedence '{'
608// %precedence ')'
609
610%locations // support location tracking for error messages
611
612%start translation_unit // parse-tree root
613
614%%
615// ************************ Namespace Management ********************************
616
617// The C grammar is not context free because it relies on the distinct terminal symbols "identifier" and "TYPEDEFname",
618// which are lexically identical.
619//
620// typedef int foo; // identifier foo must now be scanned as TYPEDEFname
621// foo f; // to allow it to appear in this context
622//
623// While it may be possible to write a purely context-free grammar, such a grammar would obscure the relationship
624// between syntactic and semantic constructs. Cforall compounds this problem by introducing type names local to the
625// scope of a declaration (for instance, those introduced through "forall" qualifiers), and by introducing "type
626// generators" -- parameterized types. This latter type name creates a third class of identifiers, "TYPEGENname", which
627// must be distinguished by the lexical scanner.
628//
629// Since the scanner cannot distinguish among the different classes of identifiers without some context information,
630// there is a type table (typedefTable), which holds type names and identifiers that override type names, for each named
631// scope. During parsing, semantic actions update the type table by adding new identifiers in the current scope. For
632// each context that introduces a name scope, a new level is created in the type table and that level is popped on
633// exiting the scope. Since type names can be local to a particular declaration, each declaration is itself a scope.
634// This requires distinguishing between type names that are local to the current declaration scope and those that
635// persist past the end of the declaration (i.e., names defined in "typedef" or "otype" declarations).
636//
637// The non-terminals "push" and "pop" denote the opening and closing of named scopes. Every push has a matching pop in
638// the production rule. There are multiple lists of declarations, where each declaration is a named scope, so pop/push
639// around the list separator.
640//
641// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
642// push pop push pop
643
644push:
645 { typedefTable.enterScope(); }
646 ;
647
648pop:
649 { typedefTable.leaveScope(); }
650 ;
651
652// ************************ CONSTANTS ********************************
653
654constant:
655 // ENUMERATIONconstant is not included here; it is treated as a variable with type "enumeration constant".
656 INTEGERconstant { $$ = new ExpressionNode( build_constantInteger( yylloc, *$1 ) ); }
657 | FLOATING_DECIMALconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
658 | FLOATING_FRACTIONconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
659 | FLOATINGconstant { $$ = new ExpressionNode( build_constantFloat( yylloc, *$1 ) ); }
660 | CHARACTERconstant { $$ = new ExpressionNode( build_constantChar( yylloc, *$1 ) ); }
661 ;
662
663quasi_keyword: // CFA
664 TIMEOUT
665 | WAND
666 | WOR
667 | CATCH
668 | RECOVER
669 | CATCHRESUME
670 | FIXUP
671 | FINALLY
672 ;
673
674identifier:
675 IDENTIFIER
676 | quasi_keyword
677 ;
678
679identifier_at:
680 identifier
681 | '@' // CFA
682 { Token tok = { new string( DeclarationNode::anonymous.newName() ), yylval.tok.loc }; $$ = tok; }
683 ;
684
685identifier_or_type_name:
686 identifier
687 | TYPEDEFname
688 | TYPEGENname
689 ;
690
691string_literal:
692 string_literal_list { $$ = new ExpressionNode( build_constantStr( yylloc, *$1 ) ); }
693 ;
694
695string_literal_list: // juxtaposed strings are concatenated
696 STRINGliteral { $$ = $1; } // conversion from tok to str
697 | string_literal_list STRINGliteral
698 {
699 if ( ! appendStr( *$1, *$2 ) ) YYERROR; // append 2nd juxtaposed string to 1st
700 delete $2; // allocated by lexer
701 $$ = $1; // conversion from tok to str
702 }
703 ;
704
705// ************************ EXPRESSIONS ********************************
706
707primary_expression:
708 IDENTIFIER // typedef name cannot be used as a variable name
709 { $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
710 | quasi_keyword
711 { $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
712 | TYPEDIMname // CFA, generic length argument
713 { $$ = new ExpressionNode( build_dimensionref( yylloc, $1 ) ); }
714 | tuple
715 | '(' comma_expression ')'
716 { $$ = $2; }
717 | '(' compound_statement ')' // GCC, lambda expression
718 { $$ = new ExpressionNode( new ast::StmtExpr( yylloc, dynamic_cast<ast::CompoundStmt *>( maybeMoveBuild( $2 ) ) ) ); }
719 | type_name '.' identifier // CFA, nested type
720 { $$ = new ExpressionNode( build_qualified_expr( yylloc, DeclarationNode::newFromTypeData( $1 ), build_varref( yylloc, $3 ) ) ); }
721 | type_name '.' '[' field_name_list ']' // CFA, nested type / tuple field selector
722 { SemanticError( yylloc, "Qualified name is currently unimplemented." ); $$ = nullptr; }
723 | GENERIC '(' assignment_expression ',' generic_assoc_list ')' // C11
724 {
725 // add the missing control expression to the GenericExpr and return it
726 $5->control = maybeMoveBuild( $3 );
727 $$ = new ExpressionNode( $5 );
728 }
729 // | RESUME '(' comma_expression ')'
730 // { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
731 // | RESUME '(' comma_expression ')' compound_statement
732 // { SemanticError( yylloc, "Resume expression is currently unimplemented." ); $$ = nullptr; }
733 | IDENTIFIER IDENTIFIER // invalid syntax rule
734 { IdentifierBeforeIdentifier( *$1.str, *$2.str, "expression" ); $$ = nullptr; }
735 | IDENTIFIER type_qualifier // invalid syntax rule
736 { IdentifierBeforeType( *$1.str, "type qualifier" ); $$ = nullptr; }
737 | IDENTIFIER storage_class // invalid syntax rule
738 { IdentifierBeforeType( *$1.str, "storage class" ); $$ = nullptr; }
739 | IDENTIFIER basic_type_name // invalid syntax rule
740 { IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
741 | IDENTIFIER TYPEDEFname // invalid syntax rule
742 { IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
743 | IDENTIFIER TYPEGENname // invalid syntax rule
744 { IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
745 ;
746
747generic_assoc_list: // C11
748 generic_association
749 | generic_assoc_list ',' generic_association
750 {
751 // steal the association node from the singleton and delete the wrapper
752 assert( 1 == $3->associations.size() );
753 $1->associations.push_back( $3->associations.front() );
754 delete $3;
755 $$ = $1;
756 }
757 ;
758
759generic_association: // C11
760 type_no_function ':' assignment_expression
761 {
762 // create a GenericExpr wrapper with one association pair
763 $$ = new ast::GenericExpr( yylloc, nullptr, { { maybeMoveBuildType( $1 ), maybeMoveBuild( $3 ) } } );
764 }
765 | DEFAULT ':' assignment_expression
766 { $$ = new ast::GenericExpr( yylloc, nullptr, { { maybeMoveBuild( $3 ) } } ); }
767 ;
768
769postfix_expression:
770 primary_expression
771 | postfix_expression '[' assignment_expression ',' tuple_expression_list ']'
772 // Historic, transitional: Disallow commas in subscripts.
773 // Switching to this behaviour may help check if a C compatibilty case uses comma-exprs in subscripts.
774 // Current: Commas in subscripts make tuples.
775 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, new ExpressionNode( build_tuple( yylloc, $3->set_last( $5 ) ) ) ) ); }
776 | postfix_expression '[' assignment_expression ']'
777 // CFA, comma_expression disallowed in this context because it results in a common user error: subscripting a
778 // matrix with x[i,j] instead of x[i][j]. While this change is not backwards compatible, there seems to be
779 // little advantage to this feature and many disadvantages. It is possible to write x[(i,j)] in CFA, which is
780 // equivalent to the old x[i,j].
781 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
782 | constant '[' assignment_expression ']' // 3[a], 'a'[a], 3.5[a]
783 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
784 | string_literal '[' assignment_expression ']' // "abc"[3], 3["abc"]
785 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Index, $1, $3 ) ); }
786 | postfix_expression '{' argument_expression_list_opt '}' // CFA, constructor call
787 {
788 Token fn;
789 fn.str = new std::string( "?{}" ); // location undefined - use location of '{'?
790 $$ = new ExpressionNode( new ast::ConstructorExpr( yylloc, build_func( yylloc, new ExpressionNode( build_varref( yylloc, fn ) ), $1->set_last( $3 ) ) ) );
791 }
792 | postfix_expression '(' argument_expression_list_opt ')'
793 { $$ = new ExpressionNode( build_func( yylloc, $1, $3 ) ); }
794 | VA_ARG '(' primary_expression ',' declaration_specifier_nobody abstract_parameter_declarator_opt ')'
795 { $$ = new ExpressionNode( build_va_arg( yylloc, $3, ( $6 ? $6->addType( $5 ) : $5 ) ) ); }
796 | postfix_expression '`' identifier // CFA, postfix call
797 { $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
798 | constant '`' identifier // CFA, postfix call
799 { $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
800 | string_literal '`' identifier // CFA, postfix call
801 { $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, build_postfix_name( $3 ) ) ), $1 ) ); }
802
803 // SKULLDUGGERY: The typedef table used for parsing does not store fields in structures. To parse a qualified
804 // name, it is assumed all name-tokens after the first are identifiers, regardless of how the lexer identifies
805 // them. For example:
806 //
807 // struct S;
808 // forall(T) struct T;
809 // union U;
810 // enum E { S, T, E };
811 // struct Z { int S, T, Z, E, U; };
812 // void fred () {
813 // Z z;
814 // z.S; // lexer returns S is TYPEDEFname
815 // z.T; // lexer returns T is TYPEGENname
816 // z.Z; // lexer returns Z is TYPEDEFname
817 // z.U; // lexer returns U is TYPEDEFname
818 // z.E; // lexer returns E is TYPEDEFname
819 // }
820 | postfix_expression '.' identifier_or_type_name
821 { $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
822
823 | postfix_expression '.' INTEGERconstant // CFA, tuple index
824 { $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_constantInteger( yylloc, *$3 ) ) ); }
825 | postfix_expression FLOATING_FRACTIONconstant // CFA, tuple index
826 { $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_field_name_FLOATING_FRACTIONconstant( yylloc, *$2 ) ) ); }
827 | postfix_expression '.' '[' field_name_list ']' // CFA, tuple field selector
828 { $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
829 | postfix_expression '.' aggregate_control
830 { $$ = new ExpressionNode( build_keyword_cast( yylloc, $3, $1 ) ); }
831 | postfix_expression ARROW identifier
832 { $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_varref( yylloc, $3 ) ) ); }
833 | postfix_expression ARROW INTEGERconstant // CFA, tuple index
834 { $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_constantInteger( yylloc, *$3 ) ) ); }
835 | postfix_expression ARROW '[' field_name_list ']' // CFA, tuple field selector
836 { $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
837 | postfix_expression ICR
838 { $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::IncrPost, $1 ) ); }
839 | postfix_expression DECR
840 { $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::DecrPost, $1 ) ); }
841 | '(' type_no_function ')' '{' initializer_list_opt comma_opt '}' // C99, compound-literal
842 { $$ = new ExpressionNode( build_compoundLiteral( yylloc, $2, new InitializerNode( $5, true ) ) ); }
843 | '(' type_no_function ')' '@' '{' initializer_list_opt comma_opt '}' // CFA, explicit C compound-literal
844 { $$ = new ExpressionNode( build_compoundLiteral( yylloc, $2, (new InitializerNode( $6, true ))->set_maybeConstructed( false ) ) ); }
845 | '^' primary_expression '{' argument_expression_list_opt '}' // CFA, destructor call
846 {
847 Token fn;
848 fn.str = new string( "^?{}" ); // location undefined
849 $$ = new ExpressionNode( build_func( yylloc, new ExpressionNode( build_varref( yylloc, fn ) ), $2->set_last( $4 ) ) );
850 }
851 ;
852
853field_name_list: // CFA, tuple field selector
854 field
855 | field_name_list ',' field { $$ = $1->set_last( $3 ); }
856 ;
857
858field: // CFA, tuple field selector
859 field_name
860 | FLOATING_DECIMALconstant field
861 { $$ = new ExpressionNode( build_fieldSel( yylloc, new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( yylloc, *$1 ) ), maybeMoveBuild( $2 ) ) ); }
862 | FLOATING_DECIMALconstant '[' field_name_list ']'
863 { $$ = new ExpressionNode( build_fieldSel( yylloc, new ExpressionNode( build_field_name_FLOATING_DECIMALconstant( yylloc, *$1 ) ), build_tuple( yylloc, $3 ) ) ); }
864 | field_name '.' field
865 { $$ = new ExpressionNode( build_fieldSel( yylloc, $1, maybeMoveBuild( $3 ) ) ); }
866 | field_name '.' '[' field_name_list ']'
867 { $$ = new ExpressionNode( build_fieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
868 | field_name ARROW field
869 { $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, maybeMoveBuild( $3 ) ) ); }
870 | field_name ARROW '[' field_name_list ']'
871 { $$ = new ExpressionNode( build_pfieldSel( yylloc, $1, build_tuple( yylloc, $4 ) ) ); }
872 ;
873
874field_name:
875 INTEGERconstant fraction_constants_opt
876 { $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_constantInteger( yylloc, *$1 ), $2 ) ); }
877 | FLOATINGconstant fraction_constants_opt
878 { $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_field_name_FLOATINGconstant( yylloc, *$1 ), $2 ) ); }
879 | identifier_at fraction_constants_opt // CFA, allow anonymous fields
880 {
881 $$ = new ExpressionNode( build_field_name_fraction_constants( yylloc, build_varref( yylloc, $1 ), $2 ) );
882 }
883 ;
884
885fraction_constants_opt:
886 // empty
887 { $$ = nullptr; }
888 | fraction_constants_opt FLOATING_FRACTIONconstant
889 {
890 ast::Expr * constant = build_field_name_FLOATING_FRACTIONconstant( yylloc, *$2 );
891 $$ = $1 != nullptr ? new ExpressionNode( build_fieldSel( yylloc, $1, constant ) ) : new ExpressionNode( constant );
892 }
893 ;
894
895unary_expression:
896 postfix_expression
897 // first location where constant/string can have operator applied: sizeof 3/sizeof "abc" still requires
898 // semantics checks, e.g., ++3, 3--, *3, &&3
899 | constant
900 | string_literal
901 { $$ = $1; }
902 | EXTENSION cast_expression // GCC
903 { $$ = $2->set_extension( true ); }
904 // '*' ('&') is separated from unary_operator because of shift/reduce conflict in:
905 // { * X; } // dereference X
906 // { * int X; } // CFA declaration of pointer to int
907 | ptrref_operator cast_expression // CFA
908 {
909 switch ( $1 ) {
910 case OperKinds::AddressOf:
911 $$ = new ExpressionNode( new ast::AddressExpr( maybeMoveBuild( $2 ) ) );
912 break;
913 case OperKinds::PointTo:
914 $$ = new ExpressionNode( build_unary_val( yylloc, $1, $2 ) );
915 break;
916 case OperKinds::And:
917 $$ = new ExpressionNode( new ast::AddressExpr( new ast::AddressExpr( maybeMoveBuild( $2 ) ) ) );
918 break;
919 default:
920 assert( false );
921 }
922 }
923 | unary_operator cast_expression
924 { $$ = new ExpressionNode( build_unary_val( yylloc, $1, $2 ) ); }
925 | ICR unary_expression
926 { $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::Incr, $2 ) ); }
927 | DECR unary_expression
928 { $$ = new ExpressionNode( build_unary_val( yylloc, OperKinds::Decr, $2 ) ); }
929 | SIZEOF unary_expression
930 { $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, new ast::TypeofType( maybeMoveBuild( $2 ) ) ) ); }
931 | SIZEOF '(' type_no_function ')'
932 { $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
933 | ALIGNOF unary_expression // GCC, variable alignment
934 { $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, new ast::TypeofType( maybeMoveBuild( $2 ) ) ) ); }
935 | ALIGNOF '(' type_no_function ')' // GCC, type alignment
936 { $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
937
938 // Cannot use rule "type", which includes cfa_abstract_function, for sizeof/alignof, because of S/R problems on
939 // look ahead, so the cfa_abstract_function is factored out.
940 | SIZEOF '(' cfa_abstract_function ')'
941 { $$ = new ExpressionNode( new ast::SizeofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
942 | ALIGNOF '(' cfa_abstract_function ')' // GCC, type alignment
943 { $$ = new ExpressionNode( new ast::AlignofExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
944
945 | OFFSETOF '(' type_no_function ',' identifier ')'
946 { $$ = new ExpressionNode( build_offsetOf( yylloc, $3, build_varref( yylloc, $5 ) ) ); }
947 | TYPEID '(' type ')'
948 {
949 SemanticError( yylloc, "typeid name is currently unimplemented." ); $$ = nullptr;
950 // $$ = new ExpressionNode( build_offsetOf( $3, build_varref( $5 ) ) );
951 }
952 | COUNTOF unary_expression
953 { $$ = new ExpressionNode( new ast::CountExpr( yylloc, maybeMoveBuild( $2 ) ) ); }
954 | COUNTOF '(' type_no_function ')'
955 { $$ = new ExpressionNode( new ast::CountExpr( yylloc, maybeMoveBuildType( $3 ) ) ); }
956 ;
957
958ptrref_operator:
959 '*' { $$ = OperKinds::PointTo; }
960 | '&' { $$ = OperKinds::AddressOf; }
961 // GCC, address of label must be handled by semantic check for ref,ref,label
962 | ANDAND { $$ = OperKinds::And; }
963 ;
964
965unary_operator:
966 '+' { $$ = OperKinds::UnPlus; }
967 | '-' { $$ = OperKinds::UnMinus; }
968 | '!' { $$ = OperKinds::Neg; }
969 | '~' { $$ = OperKinds::BitNeg; }
970 ;
971
972cast_expression:
973 unary_expression
974 | '(' type_no_function ')' cast_expression
975 { $$ = new ExpressionNode( build_cast( yylloc, $2, $4 ) ); }
976 | '(' aggregate_control '&' ')' cast_expression // CFA
977 { $$ = new ExpressionNode( build_keyword_cast( yylloc, $2, $5 ) ); }
978 | '(' aggregate_control '*' ')' cast_expression // CFA
979 { $$ = new ExpressionNode( build_keyword_cast( yylloc, $2, $5 ) ); }
980 | '(' VIRTUAL ')' cast_expression // CFA
981 { $$ = new ExpressionNode( new ast::VirtualCastExpr( yylloc, maybeMoveBuild( $4 ), nullptr ) ); }
982 | '(' VIRTUAL type_no_function ')' cast_expression // CFA
983 { $$ = new ExpressionNode( new ast::VirtualCastExpr( yylloc, maybeMoveBuild( $5 ), maybeMoveBuildType( $3 ) ) ); }
984 | '(' RETURN type_no_function ')' cast_expression // CFA
985 { $$ = new ExpressionNode( build_cast( yylloc, $3, $5, ast::CastExpr::Return ) ); }
986 | '(' COERCE type_no_function ')' cast_expression // CFA
987 { SemanticError( yylloc, "Coerce cast is currently unimplemented." ); $$ = nullptr; }
988 | '(' qualifier_cast_list ')' cast_expression // CFA
989 { SemanticError( yylloc, "Qualifier cast is currently unimplemented." ); $$ = nullptr; }
990// | '(' type_no_function ')' tuple
991// { $$ = new ast::ExpressionNode( build_cast( yylloc, $2, $4 ) ); }
992 ;
993
994qualifier_cast_list:
995 cast_modifier type_qualifier_name
996 | cast_modifier MUTEX
997 | qualifier_cast_list cast_modifier type_qualifier_name
998 | qualifier_cast_list cast_modifier MUTEX
999 ;
1000
1001cast_modifier:
1002 '-'
1003 | '+'
1004 ;
1005
1006exponential_expression:
1007 cast_expression
1008 | exponential_expression '\\' cast_expression
1009 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Exp, $1, $3 ) ); }
1010 ;
1011
1012multiplicative_expression:
1013 exponential_expression
1014 | multiplicative_expression '*' exponential_expression
1015 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Mul, $1, $3 ) ); }
1016 | multiplicative_expression '/' exponential_expression
1017 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Div, $1, $3 ) ); }
1018 | multiplicative_expression '%' exponential_expression
1019 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Mod, $1, $3 ) ); }
1020 ;
1021
1022additive_expression:
1023 multiplicative_expression
1024 | additive_expression '+' multiplicative_expression
1025 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Plus, $1, $3 ) ); }
1026 | additive_expression '-' multiplicative_expression
1027 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Minus, $1, $3 ) ); }
1028 ;
1029
1030shift_expression:
1031 additive_expression
1032 | shift_expression LS additive_expression
1033 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LShift, $1, $3 ) ); }
1034 | shift_expression RS additive_expression
1035 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::RShift, $1, $3 ) ); }
1036 ;
1037
1038relational_expression:
1039 shift_expression
1040 | relational_expression '<' shift_expression
1041 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LThan, $1, $3 ) ); }
1042 | relational_expression '>' shift_expression
1043 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::GThan, $1, $3 ) ); }
1044 | relational_expression LE shift_expression
1045 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::LEThan, $1, $3 ) ); }
1046 | relational_expression GE shift_expression
1047 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::GEThan, $1, $3 ) ); }
1048 ;
1049
1050equality_expression:
1051 relational_expression
1052 | equality_expression EQ relational_expression
1053 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Eq, $1, $3 ) ); }
1054 | equality_expression NE relational_expression
1055 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Neq, $1, $3 ) ); }
1056 ;
1057
1058AND_expression:
1059 equality_expression
1060 | AND_expression '&' equality_expression
1061 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::BitAnd, $1, $3 ) ); }
1062 ;
1063
1064exclusive_OR_expression:
1065 AND_expression
1066 | exclusive_OR_expression '^' AND_expression
1067 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::Xor, $1, $3 ) ); }
1068 ;
1069
1070inclusive_OR_expression:
1071 exclusive_OR_expression
1072 | inclusive_OR_expression '|' exclusive_OR_expression
1073 { $$ = new ExpressionNode( build_binary_val( yylloc, OperKinds::BitOr, $1, $3 ) ); }
1074 ;
1075
1076logical_AND_expression:
1077 inclusive_OR_expression
1078 | logical_AND_expression ANDAND inclusive_OR_expression
1079 { $$ = new ExpressionNode( build_and_or( yylloc, $1, $3, ast::AndExpr ) ); }
1080 ;
1081
1082logical_OR_expression:
1083 logical_AND_expression
1084 | logical_OR_expression OROR logical_AND_expression
1085 { $$ = new ExpressionNode( build_and_or( yylloc, $1, $3, ast::OrExpr ) ); }
1086 ;
1087
1088conditional_expression:
1089 logical_OR_expression
1090 | logical_OR_expression '?' comma_expression ':' conditional_expression
1091 { $$ = new ExpressionNode( build_cond( yylloc, $1, $3, $5 ) ); }
1092 | logical_OR_expression '?' /* empty */ ':' conditional_expression // GCC, omitted first operand
1093 { $$ = new ExpressionNode( build_cond( yylloc, $1, nullptr, $4 ) ); }
1094 ;
1095
1096constant_expression:
1097 conditional_expression
1098 ;
1099
1100argument_expression_list_opt:
1101 // empty
1102 { $$ = nullptr; }
1103 | argument_expression_list
1104 ;
1105
1106argument_expression_list:
1107 argument_expression
1108 // | argument_expression_list_opt ',' argument_expression // CFA, allow empty argument
1109 | argument_expression_list ',' argument_expression // no empty argument
1110 { $$ = $1->set_last( $3 ); }
1111 ;
1112
1113argument_expression:
1114 '?' // CFA, default parameter
1115 // { SemanticError( yylloc, "Argument to default parameter is currently unimplemented." ); $$ = nullptr; }
1116 { $$ = new ExpressionNode( build_constantInteger( yylloc, *new string( "2" ) ) ); }
1117 | '?' identifier '=' assignment_expression // CFA, keyword argument
1118 // { SemanticError( yylloc, "keyword argument is currently unimplemented." ); $$ = nullptr; }
1119 { $$ = $4; }
1120 | assignment_expression
1121 ;
1122
1123assignment_expression:
1124 // CFA, assignment is separated from assignment_operator to ensure no assignment operations for tuples
1125 conditional_expression
1126 | unary_expression assignment_operator assignment_expression
1127 {
1128// if ( $2 == OperKinds::AtAssn ) {
1129// SemanticError( yylloc, "C @= assignment is currently unimplemented." ); $$ = nullptr;
1130// } else {
1131 $$ = new ExpressionNode( build_binary_val( yylloc, $2, $1, $3 ) );
1132// } // if
1133 }
1134 | unary_expression '=' '{' initializer_list_opt comma_opt '}'
1135 { SemanticError( yylloc, "Initializer assignment is currently unimplemented." ); $$ = nullptr; }
1136 ;
1137
1138assignment_expression_opt:
1139 // empty
1140 { $$ = nullptr; }
1141 | assignment_expression
1142 ;
1143
1144assignment_operator:
1145 simple_assignment_operator
1146 | compound_assignment_operator
1147 ;
1148
1149simple_assignment_operator:
1150 '=' { $$ = OperKinds::Assign; }
1151 | ATassign { $$ = OperKinds::AtAssn; } // CFA
1152 ;
1153
1154compound_assignment_operator:
1155 EXPassign { $$ = OperKinds::ExpAssn; }
1156 | MULTassign { $$ = OperKinds::MulAssn; }
1157 | DIVassign { $$ = OperKinds::DivAssn; }
1158 | MODassign { $$ = OperKinds::ModAssn; }
1159 | PLUSassign { $$ = OperKinds::PlusAssn; }
1160 | MINUSassign { $$ = OperKinds::MinusAssn; }
1161 | LSassign { $$ = OperKinds::LSAssn; }
1162 | RSassign { $$ = OperKinds::RSAssn; }
1163 | ANDassign { $$ = OperKinds::AndAssn; }
1164 | ERassign { $$ = OperKinds::ERAssn; }
1165 | ORassign { $$ = OperKinds::OrAssn; }
1166 ;
1167
1168tuple: // CFA, tuple
1169 // CFA, one assignment_expression is factored out of comma_expression to eliminate a shift/reduce conflict with
1170 // comma_expression in cfa_identifier_parameter_array and cfa_abstract_array
1171 '[' ',' ']'
1172 { $$ = new ExpressionNode( build_tuple( yylloc, nullptr ) ); }
1173 | '[' assignment_expression ',' ']'
1174 { $$ = new ExpressionNode( build_tuple( yylloc, $2 ) ); }
1175 | '[' '@' comma_opt ']'
1176 { SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1177 | '[' assignment_expression ',' tuple_expression_list comma_opt ']'
1178 { $$ = new ExpressionNode( build_tuple( yylloc, $2->set_last( $4 ) ) ); }
1179 | '[' '@' ',' tuple_expression_list comma_opt ']'
1180 { SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1181 ;
1182
1183tuple_expression_list:
1184 assignment_expression
1185 | '@' // CFA
1186 { SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1187 | tuple_expression_list ',' assignment_expression
1188 { $$ = $1->set_last( $3 ); }
1189 | tuple_expression_list ',' '@'
1190 { SemanticError( yylloc, "Eliding tuple element with '@' is currently unimplemented." ); $$ = nullptr; }
1191 ;
1192
1193comma_expression:
1194 assignment_expression
1195 | comma_expression ',' assignment_expression
1196 { $$ = new ExpressionNode( new ast::CommaExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1197 ;
1198
1199comma_expression_opt:
1200 // empty
1201 { $$ = nullptr; }
1202 | comma_expression
1203 ;
1204
1205// ************************** STATEMENTS *******************************
1206
1207statement:
1208 labeled_statement
1209 | compound_statement
1210 | expression_statement
1211 | selection_statement
1212 | iteration_statement
1213 | jump_statement
1214 | with_statement
1215 | mutex_statement
1216 | waitfor_statement
1217 | waituntil_statement
1218 | corun_statement
1219 | cofor_statement
1220 | exception_statement
1221 | enable_disable_statement
1222 { SemanticError( yylloc, "enable/disable statement is currently unimplemented." ); $$ = nullptr; }
1223 | asm_statement
1224 | DIRECTIVE
1225 { $$ = new StatementNode( build_directive( yylloc, $1 ) ); }
1226 ;
1227
1228labeled_statement:
1229 // labels cannot be identifiers 0 or 1
1230 identifier_or_type_name ':' attribute_list_opt statement
1231 { $$ = $4->add_label( yylloc, $1, $3 ); }
1232 | identifier_or_type_name ':' attribute_list_opt error // invalid syntax rule
1233 {
1234 SemanticError( yylloc, "syntx error, label \"%s\" must be associated with a statement, "
1235 "where a declaration, case, or default is not a statement.\n"
1236 "Move the label or terminate with a semicolon.", $1.str->c_str() );
1237 $$ = nullptr;
1238 }
1239 ;
1240
1241compound_statement:
1242 '{' '}'
1243 { $$ = new StatementNode( build_compound( yylloc, (StatementNode *)0 ) ); }
1244 | '{' push
1245 local_label_declaration_opt // GCC, local labels appear at start of block
1246 statement_decl_list // C99, intermix declarations and statements
1247 pop '}'
1248 { $$ = new StatementNode( build_compound( yylloc, $4 ) ); }
1249 ;
1250
1251statement_decl_list: // C99
1252 statement_decl
1253 | statement_decl_list statement_decl
1254 { assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1255 ;
1256
1257statement_decl:
1258 declaration // CFA, new & old style declarations
1259 { $$ = new StatementNode( $1 ); }
1260 | EXTENSION declaration // GCC
1261 { distExt( $2 ); $$ = new StatementNode( $2 ); }
1262 | function_definition
1263 { $$ = new StatementNode( $1 ); }
1264 | EXTENSION function_definition // GCC
1265 { distExt( $2 ); $$ = new StatementNode( $2 ); }
1266 | statement
1267 ;
1268
1269statement_list_nodecl:
1270 statement
1271 | statement_list_nodecl statement
1272 { assert( $1 ); $1->set_last( $2 ); $$ = $1; }
1273 | statement_list_nodecl error // invalid syntax rule
1274 { SemanticError( yylloc, "illegal syntax, declarations only allowed at the start of the switch body,"
1275 " i.e., after the '{'." ); $$ = nullptr; }
1276 ;
1277
1278expression_statement:
1279 comma_expression_opt ';'
1280 { $$ = new StatementNode( build_expr( yylloc, $1 ) ); }
1281 ;
1282
1283// "if", "switch", and "choose" require parenthesis around the conditional. See the following ambiguities without
1284// parenthesis:
1285//
1286// if x + y + z; => if ( x ) + y + z or if ( x + y ) + z
1287//
1288// switch O { }
1289//
1290// O{} => object-constructor for conditional, switch body ???
1291// O{} => O for conditional followed by switch body
1292//
1293// C++ has this problem, as it has the same constructor syntax.
1294//
1295// switch sizeof ( T ) { }
1296//
1297// sizeof ( T ) => sizeof of T for conditional followed by switch body
1298// sizeof ( T ) => sizeof of compound literal (T){ }, closing parenthesis ???
1299//
1300// Note the two grammar rules for sizeof (alignof)
1301//
1302// | SIZEOF unary_expression
1303// | SIZEOF '(' type_no_function ')'
1304//
1305// where the first DOES NOT require parenthesis! And C++ inherits this problem from C.
1306
1307selection_statement:
1308 IF '(' conditional_declaration ')' statement %prec THEN
1309 // explicitly deal with the shift/reduce conflict on if/else
1310 { $$ = new StatementNode( build_if( yylloc, $3, maybe_build_compound( yylloc, $5 ), nullptr ) ); }
1311 | IF '(' conditional_declaration ')' statement ELSE statement
1312 { $$ = new StatementNode( build_if( yylloc, $3, maybe_build_compound( yylloc, $5 ), maybe_build_compound( yylloc, $7 ) ) ); }
1313 | SWITCH '(' comma_expression ')' case_clause
1314 { $$ = new StatementNode( build_switch( yylloc, true, $3, $5 ) ); }
1315 | SWITCH '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1316 {
1317 StatementNode *sw = new StatementNode( build_switch( yylloc, true, $3, $8 ) );
1318 // The semantics of the declaration list is changed to include associated initialization, which is performed
1319 // *before* the transfer to the appropriate case clause by hoisting the declarations into a compound
1320 // statement around the switch. Statements after the initial declaration list can never be executed, and
1321 // therefore, are removed from the grammar even though C allows it. The change also applies to choose
1322 // statement.
1323 $$ = $7 ? new StatementNode( build_compound( yylloc, (new StatementNode( $7 ))->set_last( sw ) ) ) : sw;
1324 }
1325 | SWITCH '(' comma_expression ')' '{' error '}' // CFA, invalid syntax rule error
1326 { SemanticError( yylloc, "synatx error, declarations can only appear before the list of case clauses." ); $$ = nullptr; }
1327 | CHOOSE '(' comma_expression ')' case_clause // CFA
1328 { $$ = new StatementNode( build_switch( yylloc, false, $3, $5 ) ); }
1329 | CHOOSE '(' comma_expression ')' '{' push declaration_list_opt switch_clause_list_opt pop '}' // CFA
1330 {
1331 StatementNode *sw = new StatementNode( build_switch( yylloc, false, $3, $8 ) );
1332 $$ = $7 ? new StatementNode( build_compound( yylloc, (new StatementNode( $7 ))->set_last( sw ) ) ) : sw;
1333 }
1334 | CHOOSE '(' comma_expression ')' '{' error '}' // CFA, invalid syntax rule
1335 { SemanticError( yylloc, "illegal syntax, declarations can only appear before the list of case clauses." ); $$ = nullptr; }
1336 ;
1337
1338conditional_declaration:
1339 comma_expression
1340 { $$ = new CondCtrl( nullptr, $1 ); }
1341 | c_declaration // no semi-colon
1342 { $$ = new CondCtrl( $1, nullptr ); }
1343 | cfa_declaration // no semi-colon
1344 { $$ = new CondCtrl( $1, nullptr ); }
1345 | declaration comma_expression // semi-colon separated
1346 { $$ = new CondCtrl( $1, $2 ); }
1347 ;
1348
1349// CASE and DEFAULT clauses are only allowed in the SWITCH statement, precluding Duff's device. In addition, a case
1350// clause allows a list of values and subranges.
1351
1352case_value: // CFA
1353 constant_expression { $$ = $1; }
1354 | constant_expression ELLIPSIS constant_expression // GCC, subrange
1355 { $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1356 | subrange // CFA, subrange
1357 ;
1358
1359case_value_list: // CFA
1360 case_value { $$ = new ClauseNode( build_case( yylloc, $1 ) ); }
1361 // convert case list, e.g., "case 1, 3, 5:" into "case 1: case 3: case 5"
1362 | case_value_list ',' case_value { $$ = $1->set_last( new ClauseNode( build_case( yylloc, $3 ) ) ); }
1363 ;
1364
1365case_label: // CFA
1366 CASE error // invalid syntax rule
1367 { SemanticError( yylloc, "illegal syntax, case list missing after case." ); $$ = nullptr; }
1368 | CASE case_value_list ':' { $$ = $2; }
1369 | CASE case_value_list error // invalid syntax rule
1370 { SemanticError( yylloc, "illegal syntax, colon missing after case list." ); $$ = nullptr; }
1371 | DEFAULT ':' { $$ = new ClauseNode( build_default( yylloc ) ); }
1372 // A semantic check is required to ensure only one default clause per switch/choose statement.
1373 | DEFAULT error // invalid syntax rule
1374 { SemanticError( yylloc, "illegal syntax, colon missing after default." ); $$ = nullptr; }
1375 ;
1376
1377case_label_list: // CFA
1378 case_label
1379 | case_label_list case_label { $$ = $1->set_last( $2 ); }
1380 ;
1381
1382case_clause: // CFA
1383 case_label_list statement { $$ = $1->append_last_case( maybe_build_compound( yylloc, $2 ) ); }
1384 ;
1385
1386switch_clause_list_opt: // CFA
1387 // empty
1388 { $$ = nullptr; }
1389 | switch_clause_list
1390 ;
1391
1392switch_clause_list: // CFA
1393 case_label_list statement_list_nodecl
1394 { $$ = $1->append_last_case( new StatementNode( build_compound( yylloc, $2 ) ) ); }
1395 | switch_clause_list case_label_list statement_list_nodecl
1396 { $$ = $1->set_last( $2->append_last_case( new StatementNode( build_compound( yylloc, $3 ) ) ) ); }
1397 ;
1398
1399iteration_statement:
1400 WHILE '(' ')' statement %prec THEN // CFA => while ( 1 )
1401 { $$ = new StatementNode( build_while( yylloc, new CondCtrl( nullptr, NEW_ONE ), maybe_build_compound( yylloc, $4 ) ) ); }
1402 | WHILE '(' ')' statement ELSE statement // CFA
1403 {
1404 $$ = new StatementNode( build_while( yylloc, new CondCtrl( nullptr, NEW_ONE ), maybe_build_compound( yylloc, $4 ) ) );
1405 SemanticWarning( yylloc, Warning::SuperfluousElse );
1406 }
1407 | WHILE '(' conditional_declaration ')' statement %prec THEN
1408 { $$ = new StatementNode( build_while( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1409 | WHILE '(' conditional_declaration ')' statement ELSE statement // CFA
1410 { $$ = new StatementNode( build_while( yylloc, $3, maybe_build_compound( yylloc, $5 ), $7 ) ); }
1411 | DO statement WHILE '(' ')' ';' // CFA => do while( 1 )
1412 { $$ = new StatementNode( build_do_while( yylloc, NEW_ONE, maybe_build_compound( yylloc, $2 ) ) ); }
1413 | DO statement WHILE '(' ')' ELSE statement // CFA
1414 {
1415 $$ = new StatementNode( build_do_while( yylloc, NEW_ONE, maybe_build_compound( yylloc, $2 ) ) );
1416 SemanticWarning( yylloc, Warning::SuperfluousElse );
1417 }
1418 | DO statement WHILE '(' comma_expression ')' ';'
1419 { $$ = new StatementNode( build_do_while( yylloc, $5, maybe_build_compound( yylloc, $2 ) ) ); }
1420 | DO statement WHILE '(' comma_expression ')' ELSE statement // CFA
1421 { $$ = new StatementNode( build_do_while( yylloc, $5, maybe_build_compound( yylloc, $2 ), $8 ) ); }
1422 | FOR '(' ')' statement %prec THEN // CFA => for ( ;; )
1423 { $$ = new StatementNode( build_for( yylloc, new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( yylloc, $4 ) ) ); }
1424 | FOR '(' ')' statement ELSE statement // CFA
1425 {
1426 $$ = new StatementNode( build_for( yylloc, new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( yylloc, $4 ) ) );
1427 SemanticWarning( yylloc, Warning::SuperfluousElse );
1428 }
1429 | FOR '(' for_control_expression_list ')' statement %prec THEN
1430 { $$ = new StatementNode( build_for( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1431 | FOR '(' for_control_expression_list ')' statement ELSE statement // CFA
1432 { $$ = new StatementNode( build_for( yylloc, $3, maybe_build_compound( yylloc, $5 ), $7 ) ); }
1433 ;
1434
1435for_control_expression_list:
1436 for_control_expression
1437 | for_control_expression_list ':' for_control_expression
1438 // ForCtrl + ForCtrl:
1439 // init + init => multiple declaration statements that are hoisted
1440 // condition + condition => (expression) && (expression)
1441 // change + change => (expression), (expression)
1442 {
1443 $1->init->set_last( $3->init );
1444 if ( $1->condition ) {
1445 if ( $3->condition ) {
1446 $1->condition->expr.reset( new ast::LogicalExpr( yylloc, $1->condition->expr.release(), $3->condition->expr.release(), ast::AndExpr ) );
1447 } // if
1448 } else $1->condition = $3->condition;
1449 if ( $1->change ) {
1450 if ( $3->change ) {
1451 $1->change->expr.reset( new ast::CommaExpr( yylloc, $1->change->expr.release(), $3->change->expr.release() ) );
1452 } // if
1453 } else $1->change = $3->change;
1454 $$ = $1;
1455 }
1456 ;
1457
1458for_control_expression:
1459 ';' comma_expression_opt ';' comma_expression_opt
1460 { $$ = new ForCtrl( nullptr, $2, $4 ); }
1461 | comma_expression ';' comma_expression_opt ';' comma_expression_opt
1462 {
1463 $$ = new ForCtrl( $1 ? new StatementNode( new ast::ExprStmt( yylloc, maybeMoveBuild( $1 ) ) ) : nullptr, $3, $5 );
1464 }
1465 | declaration comma_expression_opt ';' comma_expression_opt // C99, declaration has ';'
1466 { $$ = new ForCtrl( new StatementNode( $1 ), $2, $4 ); }
1467
1468 | '@' ';' comma_expression // CFA, empty loop-index
1469 { $$ = new ForCtrl( nullptr, $3, nullptr ); }
1470 | '@' ';' comma_expression ';' comma_expression // CFA, empty loop-index
1471 { $$ = new ForCtrl( nullptr, $3, $5 ); }
1472
1473 | comma_expression // CFA, anonymous loop-index
1474 { $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), NEW_ZERO, OperKinds::LThan, $1->clone(), NEW_ONE ); }
1475 | downupdowneq comma_expression // CFA, anonymous loop-index
1476 { $$ = forCtrl( yylloc, $2, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $1, NEW_ZERO, $2->clone() ), $1, UPDOWN( $1, $2->clone(), NEW_ZERO ), NEW_ONE ); }
1477
1478 | comma_expression updowneq comma_expression // CFA, anonymous loop-index
1479 { $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $2, $1->clone(), $3 ), $2, UPDOWN( $2, $3->clone(), $1->clone() ), NEW_ONE ); }
1480 | '@' updowneq comma_expression // CFA, anonymous loop-index
1481 {
1482 if ( $2 == OperKinds::LThan || $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1483 else $$ = forCtrl( yylloc, $3, new string( DeclarationNode::anonymous.newName() ), $3->clone(), $2, nullptr, NEW_ONE );
1484 }
1485 | comma_expression updowneq '@' // CFA, anonymous loop-index
1486 {
1487 if ( $2 == OperKinds::LThan || $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1488 else { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1489 }
1490 | comma_expression updowneq comma_expression '~' comma_expression // CFA, anonymous loop-index
1491 { $$ = forCtrl( yylloc, $1, new string( DeclarationNode::anonymous.newName() ), UPDOWN( $2, $1->clone(), $3 ), $2, UPDOWN( $2, $3->clone(), $1->clone() ), $5 ); }
1492 | '@' updowneq comma_expression '~' comma_expression // CFA, anonymous loop-index
1493 {
1494 if ( $2 == OperKinds::LThan || $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1495 else $$ = forCtrl( yylloc, $3, new string( DeclarationNode::anonymous.newName() ), $3->clone(), $2, nullptr, $5 );
1496 }
1497 | comma_expression updowneq '@' '~' comma_expression // CFA, anonymous loop-index
1498 {
1499 if ( $2 == OperKinds::LThan || $2 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1500 else { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1501 }
1502 | comma_expression updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1503 { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1504 | '@' updowneq '@' // CFA, invalid syntax rule
1505 { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1506 | '@' updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1507 { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1508 | comma_expression updowneq '@' '~' '@' // CFA, invalid syntax rule
1509 { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1510 | '@' updowneq '@' '~' '@' // CFA, invalid syntax rule
1511 { SemanticError( yylloc, MISSING_ANON_FIELD ); $$ = nullptr; }
1512
1513 // These rules accept a comma_expression for the initialization, when only an identifier is correct. Being
1514 // permissive allows for a better error message from forCtrl.
1515 | comma_expression ';' comma_expression // CFA
1516 { $$ = forCtrl( yylloc, $3, $1, NEW_ZERO, OperKinds::LThan, $3->clone(), NEW_ONE ); }
1517 | comma_expression ';' downupdowneq comma_expression // CFA
1518 { $$ = forCtrl( yylloc, $4, $1, UPDOWN( $3, NEW_ZERO, $4->clone() ), $3, UPDOWN( $3, $4->clone(), NEW_ZERO ), NEW_ONE ); }
1519
1520 | comma_expression ';' comma_expression updowneq comma_expression // CFA
1521 { $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), NEW_ONE ); }
1522 | comma_expression ';' '@' updowneq comma_expression // CFA
1523 {
1524 if ( $4 == OperKinds::LThan || $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1525 else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, NEW_ONE );
1526 }
1527 | comma_expression ';' comma_expression updowneq '@' // CFA
1528 {
1529 if ( $4 == OperKinds::GThan || $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1530 else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "illegal syntax, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1531 else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, NEW_ONE );
1532 }
1533 | comma_expression ';' '@' updowneq '@' // CFA, invalid syntax rule
1534 { SemanticError( yylloc, "illegal syntax, missing low/high value for ascending/descending range so index is uninitialized." ); $$ = nullptr; }
1535
1536 | comma_expression ';' comma_expression updowneq comma_expression '~' comma_expression // CFA
1537 { $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), $7 ); }
1538 | comma_expression ';' '@' updowneq comma_expression '~' comma_expression // CFA, invalid syntax rule
1539 {
1540 if ( $4 == OperKinds::LThan || $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1541 else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, $7 );
1542 }
1543 | comma_expression ';' comma_expression updowneq '@' '~' comma_expression // CFA
1544 {
1545 if ( $4 == OperKinds::GThan || $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1546 else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "illegal syntax, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1547 else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, $7 );
1548 }
1549 | comma_expression ';' comma_expression updowneq comma_expression '~' '@' // CFA
1550 { $$ = forCtrl( yylloc, $3, $1, UPDOWN( $4, $3->clone(), $5 ), $4, UPDOWN( $4, $5->clone(), $3->clone() ), nullptr ); }
1551 | comma_expression ';' '@' updowneq comma_expression '~' '@' // CFA, invalid syntax rule
1552 {
1553 if ( $4 == OperKinds::LThan || $4 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1554 else $$ = forCtrl( yylloc, $5, $1, $5->clone(), $4, nullptr, nullptr );
1555 }
1556 | comma_expression ';' comma_expression updowneq '@' '~' '@' // CFA
1557 {
1558 if ( $4 == OperKinds::GThan || $4 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1559 else if ( $4 == OperKinds::LEThan ) { SemanticError( yylloc, "illegal syntax, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1560 else $$ = forCtrl( yylloc, $3, $1, $3->clone(), $4, nullptr, nullptr );
1561 }
1562 | comma_expression ';' '@' updowneq '@' '~' '@' // CFA
1563 { SemanticError( yylloc, "illegal syntax, missing low/high value for ascending/descending range so index is uninitialized." ); $$ = nullptr; }
1564
1565// | '@' identifier ';' comma_expression // CFA
1566 | declaration comma_expression // CFA
1567 { $$ = forCtrl( yylloc, $1, NEW_ZERO, OperKinds::LThan, $2, NEW_ONE ); }
1568 | declaration downupdowneq comma_expression // CFA
1569 { $$ = forCtrl( yylloc, $1, UPDOWN( $2, NEW_ZERO, $3 ), $2, UPDOWN( $2, $3->clone(), NEW_ZERO ), NEW_ONE ); }
1570
1571 | declaration comma_expression updowneq comma_expression // CFA
1572 { $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2->clone(), $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), NEW_ONE ); }
1573 | declaration '@' updowneq comma_expression // CFA
1574 {
1575 if ( $3 == OperKinds::LThan || $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1576 else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, NEW_ONE );
1577 }
1578 | declaration comma_expression updowneq '@' // CFA
1579 {
1580 if ( $3 == OperKinds::GThan || $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1581 else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "illegal syntax, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1582 else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, NEW_ONE );
1583 }
1584
1585 | declaration comma_expression updowneq comma_expression '~' comma_expression // CFA
1586 { $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2, $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), $6 ); }
1587 | declaration '@' updowneq comma_expression '~' comma_expression // CFA
1588 {
1589 if ( $3 == OperKinds::LThan || $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1590 else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, $6 );
1591 }
1592 | declaration comma_expression updowneq '@' '~' comma_expression // CFA
1593 {
1594 if ( $3 == OperKinds::GThan || $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1595 else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "illegal syntax, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1596 else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, $6 );
1597 }
1598 | declaration comma_expression updowneq comma_expression '~' '@' // CFA
1599 { $$ = forCtrl( yylloc, $1, UPDOWN( $3, $2, $4 ), $3, UPDOWN( $3, $4->clone(), $2->clone() ), nullptr ); }
1600 | declaration '@' updowneq comma_expression '~' '@' // CFA
1601 {
1602 if ( $3 == OperKinds::LThan || $3 == OperKinds::LEThan ) { SemanticError( yylloc, MISSING_LOW ); $$ = nullptr; }
1603 else $$ = forCtrl( yylloc, $1, $4, $3, nullptr, nullptr );
1604 }
1605 | declaration comma_expression updowneq '@' '~' '@' // CFA
1606 {
1607 if ( $3 == OperKinds::GThan || $3 == OperKinds::GEThan ) { SemanticError( yylloc, MISSING_HIGH ); $$ = nullptr; }
1608 else if ( $3 == OperKinds::LEThan ) { SemanticError( yylloc, "illegal syntax, equality with missing high value is meaningless. Use \"~\"." ); $$ = nullptr; }
1609 else $$ = forCtrl( yylloc, $1, $2, $3, nullptr, nullptr );
1610 }
1611 | declaration '@' updowneq '@' '~' '@' // CFA, invalid syntax rule
1612 { SemanticError( yylloc, "illegal syntax, missing low/high value for ascending/descending range so index is uninitialized." ); $$ = nullptr; }
1613
1614 | comma_expression ';' type_type_specifier // CFA, enum type
1615 {
1616 $$ = enumRangeCtrl( $1, OperKinds::LEThan, new ExpressionNode( new ast::TypeExpr( yylloc, $3->clone()->buildType() ) ), $3 );
1617 }
1618 | comma_expression ';' downupdowneq enum_key // CFA, enum type, reverse direction
1619 {
1620 if ( $3 == OperKinds::GThan ) {
1621 SemanticError( yylloc, "all enumeration ranges are equal (all values). Add an equal, e.g., ~=, -~=." ); $$ = nullptr;
1622 $3 = OperKinds::GEThan;
1623 } // if
1624 $$ = enumRangeCtrl( $1, $3, new ExpressionNode( new ast::TypeExpr( yylloc, $4->clone()->buildType() ) ), $4 );
1625 }
1626 ;
1627
1628enum_key:
1629 type_name
1630 {
1631 typedefTable.makeTypedef( *$1->symbolic.name, "enum_type_nobody 1" );
1632 $$ = DeclarationNode::newEnum( $1->symbolic.name, nullptr, false, false );
1633 }
1634 | ENUM identifier
1635 {
1636 typedefTable.makeTypedef( *$2, "enum_type_nobody 2" );
1637 $$ = DeclarationNode::newEnum( $2, nullptr, false, false );
1638 }
1639 | ENUM type_name
1640 {
1641 typedefTable.makeTypedef( *$2->symbolic.name, "enum_type_nobody 3" );
1642 $$ = DeclarationNode::newEnum( $2->symbolic.name, nullptr, false, false );
1643 }
1644 ;
1645
1646// This rule exists to handle the ambiguity with unary operator '~'. The rule is the same as updowneq minus the '~'.
1647// Specifically, "for ( ~5 )" means the complement of 5, not loop 0..4. Hence, in this case "for ( ~= 5 )", i.e., 0..5,
1648// it is not possible to just remove the '='. The entire '~=' must be removed.
1649downupdowneq:
1650 ErangeUp
1651 { $$ = OperKinds::LThan; }
1652 | ErangeDown
1653 { $$ = OperKinds::GThan; }
1654 | ErangeUpEq
1655 { $$ = OperKinds::LEThan; }
1656 | ErangeDownEq
1657 { $$ = OperKinds::GEThan; }
1658 ;
1659
1660updown:
1661 '~' // shorthand 0 ~ 10 => 0 +~ 10
1662 { $$ = OperKinds::LThan; }
1663 | ErangeUp
1664 { $$ = OperKinds::LThan; }
1665 | ErangeDown
1666 { $$ = OperKinds::GThan; }
1667 ;
1668
1669updowneq:
1670 updown
1671 | ErangeUpEq
1672 { $$ = OperKinds::LEThan; }
1673 | ErangeDownEq
1674 { $$ = OperKinds::GEThan; }
1675 ;
1676
1677jump_statement:
1678 GOTO identifier_or_type_name ';'
1679 { $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Goto ) ); }
1680 | GOTO '*' comma_expression ';' // GCC, computed goto
1681 // The syntax for the GCC computed goto violates normal expression precedence, e.g., goto *i+3; => goto *(i+3);
1682 // whereas normal operator precedence yields goto (*i)+3;
1683 { $$ = new StatementNode( build_computedgoto( $3 ) ); }
1684 // A semantic check is required to ensure fallthru appears only in the body of a choose statement.
1685 | fall_through_name ';' // CFA
1686 { $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::FallThrough ) ); }
1687 | fall_through_name identifier_or_type_name ';' // CFA
1688 { $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::FallThrough ) ); }
1689 | fall_through_name DEFAULT ';' // CFA
1690 { $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::FallThroughDefault ) ); }
1691 | CONTINUE ';'
1692 // A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1693 { $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::Continue ) ); }
1694 | CONTINUE identifier_or_type_name ';' // CFA, multi-level continue
1695 // A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1696 // the target of the transfer appears only at the start of an iteration statement.
1697 { $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Continue ) ); }
1698 | BREAK ';'
1699 // A semantic check is required to ensure this statement appears only in the body of an iteration statement.
1700 { $$ = new StatementNode( build_branch( yylloc, ast::BranchStmt::Break ) ); }
1701 | BREAK identifier_or_type_name ';' // CFA, multi-level exit
1702 // A semantic check is required to ensure this statement appears only in the body of an iteration statement, and
1703 // the target of the transfer appears only at the start of an iteration statement.
1704 { $$ = new StatementNode( build_branch( yylloc, $2, ast::BranchStmt::Break ) ); }
1705 | RETURN comma_expression_opt ';'
1706 { $$ = new StatementNode( build_return( yylloc, $2 ) ); }
1707 | RETURN '{' initializer_list_opt comma_opt '}' ';'
1708 { SemanticError( yylloc, "Initializer return is currently unimplemented." ); $$ = nullptr; }
1709 | SUSPEND ';'
1710 { $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::None ) ); }
1711 | SUSPEND compound_statement
1712 { $$ = new StatementNode( build_suspend( yylloc, $2, ast::SuspendStmt::None ) ); }
1713 | SUSPEND COROUTINE ';'
1714 { $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::Coroutine ) ); }
1715 | SUSPEND COROUTINE compound_statement
1716 { $$ = new StatementNode( build_suspend( yylloc, $3, ast::SuspendStmt::Coroutine ) ); }
1717 | SUSPEND GENERATOR ';'
1718 { $$ = new StatementNode( build_suspend( yylloc, nullptr, ast::SuspendStmt::Generator ) ); }
1719 | SUSPEND GENERATOR compound_statement
1720 { $$ = new StatementNode( build_suspend( yylloc, $3, ast::SuspendStmt::Generator ) ); }
1721 | THROW assignment_expression_opt ';' // handles rethrow
1722 { $$ = new StatementNode( build_throw( yylloc, $2 ) ); }
1723 | THROWRESUME assignment_expression_opt ';' // handles reresume
1724 { $$ = new StatementNode( build_resume( yylloc, $2 ) ); }
1725 | THROWRESUME assignment_expression_opt AT assignment_expression ';' // handles reresume
1726 { $$ = new StatementNode( build_resume_at( $2, $4 ) ); }
1727 ;
1728
1729fall_through_name: // CFA
1730 FALLTHRU
1731 | FALLTHROUGH
1732 ;
1733
1734with_statement:
1735 WITH '(' type_list ')' statement // support scoped enumeration
1736 { $$ = new StatementNode( build_with( yylloc, $3, $5 ) ); }
1737 ;
1738
1739// If MUTEX becomes a general qualifier, there are shift/reduce conflicts, so possibly change syntax to "with mutex".
1740mutex_statement:
1741 MUTEX '(' argument_expression_list_opt ')' statement
1742 {
1743 if ( ! $3 ) { SemanticError( yylloc, "illegal syntax, mutex argument list cannot be empty." ); $$ = nullptr; }
1744 $$ = new StatementNode( build_mutex( yylloc, $3, $5 ) );
1745 }
1746 ;
1747
1748when_clause:
1749 WHEN '(' comma_expression ')' { $$ = $3; }
1750 ;
1751
1752when_clause_opt:
1753 // empty
1754 { $$ = nullptr; }
1755 | when_clause
1756 ;
1757
1758cast_expression_list:
1759 cast_expression
1760 | cast_expression_list ',' cast_expression
1761 { SemanticError( yylloc, "List of mutex member is currently unimplemented." ); $$ = nullptr; }
1762 ;
1763
1764timeout:
1765 TIMEOUT '(' comma_expression ')' { $$ = $3; }
1766 ;
1767
1768wor:
1769 OROR
1770 | WOR
1771
1772waitfor:
1773 WAITFOR '(' cast_expression ')'
1774 { $$ = $3; }
1775 | WAITFOR '(' cast_expression_list ':' argument_expression_list_opt ')'
1776 { $$ = $3->set_last( $5 ); }
1777 ;
1778
1779wor_waitfor_clause:
1780 when_clause_opt waitfor statement %prec THEN
1781 // Called first: create header for WaitForStmt.
1782 { $$ = build_waitfor( yylloc, new ast::WaitForStmt( yylloc ), $1, $2, maybe_build_compound( yylloc, $3 ) ); }
1783 | wor_waitfor_clause wor when_clause_opt waitfor statement
1784 { $$ = build_waitfor( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ); }
1785 | wor_waitfor_clause wor when_clause_opt ELSE statement
1786 { $$ = build_waitfor_else( yylloc, $1, $3, maybe_build_compound( yylloc, $5 ) ); }
1787 | wor_waitfor_clause wor when_clause_opt timeout statement %prec THEN
1788 { $$ = build_waitfor_timeout( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ); }
1789 // "else" must be conditional after timeout or timeout is never triggered (i.e., it is meaningless)
1790 | wor_waitfor_clause wor when_clause_opt timeout statement wor ELSE statement // invalid syntax rule
1791 { SemanticError( yylloc, "illegal syntax, else clause must be conditional after timeout or timeout never triggered." ); $$ = nullptr; }
1792 | wor_waitfor_clause wor when_clause_opt timeout statement wor when_clause ELSE statement
1793 { $$ = build_waitfor_else( yylloc, build_waitfor_timeout( yylloc, $1, $3, $4, maybe_build_compound( yylloc, $5 ) ), $7, maybe_build_compound( yylloc, $9 ) ); }
1794 ;
1795
1796waitfor_statement:
1797 wor_waitfor_clause %prec THEN
1798 { $$ = new StatementNode( $1 ); }
1799 ;
1800
1801wand:
1802 ANDAND
1803 | WAND
1804 ;
1805
1806waituntil:
1807 WAITUNTIL '(' comma_expression ')'
1808 { $$ = $3; }
1809 ;
1810
1811waituntil_clause:
1812 when_clause_opt waituntil statement
1813 { $$ = build_waituntil_clause( yylloc, $1, $2, maybe_build_compound( yylloc, $3 ) ); }
1814 | '(' wor_waituntil_clause ')'
1815 { $$ = $2; }
1816 ;
1817
1818wand_waituntil_clause:
1819 waituntil_clause %prec THEN
1820 { $$ = $1; }
1821 | waituntil_clause wand wand_waituntil_clause
1822 { $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::AND, $1, $3 ); }
1823 ;
1824
1825wor_waituntil_clause:
1826 wand_waituntil_clause
1827 { $$ = $1; }
1828 | wor_waituntil_clause wor wand_waituntil_clause
1829 { $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::OR, $1, $3 ); }
1830 | wor_waituntil_clause wor when_clause_opt ELSE statement
1831 { $$ = new ast::WaitUntilStmt::ClauseNode( ast::WaitUntilStmt::ClauseNode::Op::LEFT_OR, $1, build_waituntil_else( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1832 ;
1833
1834waituntil_statement:
1835 wor_waituntil_clause %prec THEN
1836 { $$ = new StatementNode( build_waituntil_stmt( yylloc, $1 ) ); }
1837 ;
1838
1839corun_statement:
1840 CORUN statement
1841 { $$ = new StatementNode( build_corun( yylloc, $2 ) ); }
1842 ;
1843
1844cofor_statement:
1845 COFOR '(' for_control_expression_list ')' statement
1846 { $$ = new StatementNode( build_cofor( yylloc, $3, maybe_build_compound( yylloc, $5 ) ) ); }
1847 ;
1848
1849exception_statement:
1850 TRY compound_statement handler_clause %prec THEN
1851 { $$ = new StatementNode( build_try( yylloc, $2, $3, nullptr ) ); }
1852 | TRY compound_statement finally_clause
1853 { $$ = new StatementNode( build_try( yylloc, $2, nullptr, $3 ) ); }
1854 | TRY compound_statement handler_clause finally_clause
1855 { $$ = new StatementNode( build_try( yylloc, $2, $3, $4 ) ); }
1856 ;
1857
1858handler_clause:
1859 handler_key '(' exception_declaration handler_predicate_opt ')' compound_statement
1860 { $$ = new ClauseNode( build_catch( yylloc, $1, $3, $4, $6 ) ); }
1861 | handler_clause handler_key '(' exception_declaration handler_predicate_opt ')' compound_statement
1862 { $$ = $1->set_last( new ClauseNode( build_catch( yylloc, $2, $4, $5, $7 ) ) ); }
1863 ;
1864
1865handler_predicate_opt:
1866 // empty
1867 { $$ = nullptr; }
1868 | ';' conditional_expression { $$ = $2; }
1869 ;
1870
1871handler_key:
1872 CATCH { $$ = ast::Terminate; }
1873 | RECOVER { $$ = ast::Terminate; }
1874 | CATCHRESUME { $$ = ast::Resume; }
1875 | FIXUP { $$ = ast::Resume; }
1876 ;
1877
1878finally_clause:
1879 FINALLY compound_statement { $$ = new ClauseNode( build_finally( yylloc, $2 ) ); }
1880 ;
1881
1882exception_declaration:
1883 // No SUE declaration in parameter list.
1884 type_specifier_nobody
1885 | type_specifier_nobody declarator
1886 { $$ = $2->addType( $1 ); }
1887 | type_specifier_nobody variable_abstract_declarator
1888 { $$ = $2->addType( $1 ); }
1889 | cfa_abstract_declarator_tuple identifier // CFA
1890 { $$ = $1->addName( $2 ); }
1891 | cfa_abstract_declarator_tuple // CFA
1892 ;
1893
1894enable_disable_statement:
1895 enable_disable_key identifier_list compound_statement
1896 ;
1897
1898enable_disable_key:
1899 ENABLE
1900 | DISABLE
1901 ;
1902
1903asm_statement:
1904 ASM asm_volatile_opt '(' string_literal ')' ';'
1905 { $$ = new StatementNode( build_asm( yylloc, $2, $4, nullptr ) ); }
1906 | ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ')' ';' // remaining GCC
1907 { $$ = new StatementNode( build_asm( yylloc, $2, $4, $6 ) ); }
1908 | ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ')' ';'
1909 { $$ = new StatementNode( build_asm( yylloc, $2, $4, $6, $8 ) ); }
1910 | ASM asm_volatile_opt '(' string_literal ':' asm_operands_opt ':' asm_operands_opt ':' asm_clobbers_list_opt ')' ';'
1911 { $$ = new StatementNode( build_asm( yylloc, $2, $4, $6, $8, $10 ) ); }
1912 | ASM asm_volatile_opt GOTO '(' string_literal ':' ':' asm_operands_opt ':' asm_clobbers_list_opt ':' label_list ')' ';'
1913 { $$ = new StatementNode( build_asm( yylloc, $2, $5, nullptr, $8, $10, $12 ) ); }
1914 ;
1915
1916asm_volatile_opt: // GCC
1917 // empty
1918 { $$ = false; }
1919 | VOLATILE
1920 { $$ = true; }
1921 ;
1922
1923asm_operands_opt: // GCC
1924 // empty
1925 { $$ = nullptr; } // use default argument
1926 | asm_operands_list
1927 ;
1928
1929asm_operands_list: // GCC
1930 asm_operand
1931 | asm_operands_list ',' asm_operand
1932 { $$ = $1->set_last( $3 ); }
1933 ;
1934
1935asm_operand: // GCC
1936 string_literal '(' constant_expression ')'
1937 { $$ = new ExpressionNode( new ast::AsmExpr( yylloc, "", maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
1938 | '[' IDENTIFIER ']' string_literal '(' constant_expression ')'
1939 {
1940 $$ = new ExpressionNode( new ast::AsmExpr( yylloc, *$2.str, maybeMoveBuild( $4 ), maybeMoveBuild( $6 ) ) );
1941 delete $2.str;
1942 }
1943 ;
1944
1945asm_clobbers_list_opt: // GCC
1946 // empty
1947 { $$ = nullptr; } // use default argument
1948 | string_literal
1949 { $$ = $1; }
1950 | asm_clobbers_list_opt ',' string_literal
1951 { $$ = $1->set_last( $3 ); }
1952 ;
1953
1954label_list:
1955 identifier
1956 {
1957 $$ = new LabelNode(); $$->labels.emplace_back( yylloc, *$1 );
1958 delete $1; // allocated by lexer
1959 }
1960 | label_list ',' identifier
1961 {
1962 $$ = $1; $1->labels.emplace_back( yylloc, *$3 );
1963 delete $3; // allocated by lexer
1964 }
1965 ;
1966
1967// ****************************** DECLARATIONS *********************************
1968
1969declaration_list_opt: // used at beginning of switch statement
1970 // empty
1971 { $$ = nullptr; }
1972 | declaration_list
1973 ;
1974
1975declaration_list:
1976 declaration
1977 | declaration_list declaration
1978 { $$ = $1->set_last( $2 ); }
1979 ;
1980
1981KR_parameter_list_opt: // used to declare parameter types in K&R style functions
1982 // empty
1983 { $$ = nullptr; }
1984 | KR_parameter_list
1985 ;
1986
1987KR_parameter_list:
1988 c_declaration ';'
1989 { $$ = $1; }
1990 | KR_parameter_list c_declaration ';'
1991 { $$ = $1->set_last( $2 ); }
1992 ;
1993
1994local_label_declaration_opt: // GCC, local label
1995 // empty
1996 | local_label_declaration_list
1997 ;
1998
1999local_label_declaration_list: // GCC, local label
2000 LABEL local_label_list ';'
2001 | local_label_declaration_list LABEL local_label_list ';'
2002 ;
2003
2004local_label_list: // GCC, local label
2005 identifier_or_type_name
2006 | local_label_list ',' identifier_or_type_name
2007 ;
2008
2009declaration: // old & new style declarations
2010 c_declaration ';'
2011 | cfa_declaration ';' // CFA
2012 | static_assert ';' // C11
2013 ;
2014
2015static_assert:
2016 STATICASSERT '(' constant_expression ',' string_literal ')' // C11
2017 { $$ = DeclarationNode::newStaticAssert( $3, maybeMoveBuild( $5 ) ); }
2018 | STATICASSERT '(' constant_expression ')' // CFA
2019 { $$ = DeclarationNode::newStaticAssert( $3, build_constantStr( yylloc, *new string( "\"\"" ) ) ); }
2020
2021// C declaration syntax is notoriously confusing and error prone. Cforall provides its own type, variable and function
2022// declarations. CFA declarations use the same declaration tokens as in C; however, CFA places declaration modifiers to
2023// the left of the base type, while C declarations place modifiers to the right of the base type. CFA declaration
2024// modifiers are interpreted from left to right and the entire type specification is distributed across all variables in
2025// the declaration list (as in Pascal). ANSI C and the new CFA declarations may appear together in the same program
2026// block, but cannot be mixed within a specific declaration.
2027//
2028// CFA C
2029// [10] int x; int x[10]; // array of 10 integers
2030// [10] * char y; char *y[10]; // array of 10 pointers to char
2031
2032cfa_declaration: // CFA
2033 cfa_variable_declaration
2034 | cfa_typedef_declaration
2035 | cfa_function_declaration
2036 | type_declaring_list
2037 { SemanticError( yylloc, "otype declaration is currently unimplemented." ); $$ = nullptr; }
2038 | trait_specifier
2039 ;
2040
2041cfa_variable_declaration: // CFA
2042 cfa_variable_specifier initializer_opt
2043 { $$ = $1->addInitializer( $2 ); }
2044 | declaration_qualifier_list cfa_variable_specifier initializer_opt
2045 // declaration_qualifier_list also includes type_qualifier_list, so a semantic check is necessary to preclude
2046 // them as a type_qualifier cannot appear in that context.
2047 { $$ = $2->addQualifiers( $1 )->addInitializer( $3 ); }
2048 | cfa_variable_declaration pop ',' push identifier_or_type_name initializer_opt
2049 { $$ = $1->set_last( $1->cloneType( $5 )->addInitializer( $6 ) ); }
2050 ;
2051
2052cfa_variable_specifier: // CFA
2053 // A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
2054 // storage-class
2055 cfa_abstract_declarator_no_tuple identifier_or_type_name asm_name_opt
2056 { $$ = $1->addName( $2 )->addAsmName( $3 ); }
2057 | cfa_abstract_tuple identifier_or_type_name asm_name_opt
2058 { $$ = $1->addName( $2 )->addAsmName( $3 ); }
2059 | type_qualifier_list cfa_abstract_tuple identifier_or_type_name asm_name_opt
2060 { $$ = $2->addQualifiers( $1 )->addName( $3 )->addAsmName( $4 ); }
2061
2062 // [ int s, int t ]; // declare s and t
2063 // [ int, int ] f();
2064 // [] g( int );
2065 // [ int x, int y ] = f(); // declare x and y, initialize each from f
2066 // g( x + y );
2067 | cfa_function_return asm_name_opt
2068 { SemanticError( yylloc, "tuple-element declarations is currently unimplemented." ); $$ = nullptr; }
2069 | type_qualifier_list cfa_function_return asm_name_opt
2070 { SemanticError( yylloc, "tuple variable declaration is currently unimplemented." ); $$ = nullptr; }
2071 ;
2072
2073cfa_function_declaration: // CFA
2074 cfa_function_specifier
2075 | type_qualifier_list cfa_function_specifier
2076 { $$ = $2->addQualifiers( $1 ); }
2077 | declaration_qualifier_list cfa_function_specifier
2078 { $$ = $2->addQualifiers( $1 ); }
2079 | declaration_qualifier_list type_qualifier_list cfa_function_specifier
2080 { $$ = $3->addQualifiers( $1 )->addQualifiers( $2 ); }
2081 | cfa_function_declaration ',' identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')'
2082 {
2083 // Append the return type at the start (left-hand-side) to each identifier in the list.
2084 DeclarationNode * ret = new DeclarationNode;
2085 ret->type = maybeCopy( $1->type->base );
2086 $$ = $1->set_last( DeclarationNode::newFunction( $3, ret, $6, nullptr ) );
2087 }
2088 ;
2089
2090cfa_function_specifier: // CFA
2091 '[' ']' identifier '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2092 { $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2093 | '[' ']' TYPEDEFname '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2094 { $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2095 // | '[' ']' TYPEGENname '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2096 // { $$ = DeclarationNode::newFunction( $3, DeclarationNode::newTuple( nullptr ), $6, nullptr )->addQualifiers( $9 ); }
2097
2098 // identifier_or_type_name must be broken apart because of the sequence:
2099 //
2100 // '[' ']' identifier_or_type_name '(' cfa_parameter_list_ellipsis_opt ')'
2101 // '[' ']' type_specifier
2102 //
2103 // type_specifier can resolve to just TYPEDEFname (e.g., typedef int T; int f( T );). Therefore this must be
2104 // flattened to allow lookahead to the '(' without having to reduce identifier_or_type_name.
2105 | cfa_abstract_tuple identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2106 // To obtain LR(1 ), this rule must be factored out from function return type (see cfa_abstract_declarator).
2107 { $$ = DeclarationNode::newFunction( $2, $1, $5, nullptr )->addQualifiers( $8 ); }
2108 | cfa_function_return identifier_or_type_name '(' push cfa_parameter_list_ellipsis_opt pop ')' attribute_list_opt
2109 { $$ = DeclarationNode::newFunction( $2, $1, $5, nullptr )->addQualifiers( $8 ); }
2110 ;
2111
2112cfa_function_return: // CFA
2113 '[' cfa_parameter_list ']'
2114 { $$ = DeclarationNode::newTuple( $2 ); }
2115 | '[' cfa_parameter_list ',' cfa_abstract_parameter_list ']'
2116 // To obtain LR(1 ), the last cfa_abstract_parameter_list is added into this flattened rule to lookahead to the ']'.
2117 { $$ = DeclarationNode::newTuple( $2->set_last( $4 ) ); }
2118 ;
2119
2120cfa_typedef_declaration: // CFA
2121 TYPEDEF cfa_variable_specifier
2122 {
2123 typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "cfa_typedef_declaration 1" );
2124 $$ = $2->addTypedef();
2125 }
2126 | TYPEDEF cfa_function_specifier
2127 {
2128 typedefTable.addToEnclosingScope( *$2->name, TYPEDEFname, "cfa_typedef_declaration 2" );
2129 $$ = $2->addTypedef();
2130 }
2131 | cfa_typedef_declaration ',' identifier
2132 {
2133 typedefTable.addToEnclosingScope( *$3, TYPEDEFname, "cfa_typedef_declaration 3" );
2134 $$ = $1->set_last( $1->cloneType( $3 ) );
2135 }
2136 ;
2137
2138// Traditionally typedef is part of storage-class specifier for syntactic convenience only. Here, it is factored out as
2139// a separate form of declaration, which syntactically precludes storage-class specifiers and initialization.
2140
2141typedef_declaration:
2142 TYPEDEF type_specifier declarator
2143 {
2144 typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "typedef_declaration 1" );
2145 if ( $2->type->forall || ($2->type->kind == TypeData::Aggregate && $2->type->aggregate.params) ) {
2146 SemanticError( yylloc, "forall qualifier in typedef is currently unimplemented." ); $$ = nullptr;
2147 } else $$ = $3->addType( $2 )->addTypedef(); // watchout frees $2 and $3
2148 }
2149 | typedef_declaration ',' declarator
2150 {
2151 typedefTable.addToEnclosingScope( *$3->name, TYPEDEFname, "typedef_declaration 2" );
2152 $$ = $1->set_last( $1->cloneBaseType( $3 )->addTypedef() );
2153 }
2154 | type_qualifier_list TYPEDEF type_specifier declarator // remaining OBSOLESCENT (see 2 )
2155 { SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2156 | type_specifier TYPEDEF declarator
2157 { SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2158 | type_specifier TYPEDEF type_qualifier_list declarator
2159 { SemanticError( yylloc, "Type qualifiers/specifiers before TYPEDEF is deprecated, move after TYPEDEF." ); $$ = nullptr; }
2160 ;
2161
2162typedef_expression:
2163 // deprecated GCC, naming expression type: typedef name = exp; gives a name to the type of an expression
2164 TYPEDEF identifier '=' assignment_expression
2165 {
2166 SemanticError( yylloc, "TYPEDEF expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
2167 }
2168 | typedef_expression ',' identifier '=' assignment_expression
2169 {
2170 SemanticError( yylloc, "TYPEDEF expression is deprecated, use typeof(...) instead." ); $$ = nullptr;
2171 }
2172 ;
2173
2174c_declaration:
2175 declaration_specifier declaring_list
2176 { $$ = distAttr( $1, $2 ); }
2177 | typedef_declaration
2178 | typedef_expression // deprecated GCC, naming expression type
2179 | sue_declaration_specifier
2180 {
2181 assert( $1->type );
2182 if ( $1->type->qualifiers.any() ) { // CV qualifiers ?
2183 SemanticError( yylloc, "illegal syntax, useless type qualifier(s) in empty declaration." ); $$ = nullptr;
2184 }
2185 // enums are never empty declarations because there must have at least one enumeration.
2186 if ( $1->type->kind == TypeData::AggregateInst && $1->storageClasses.any() ) { // storage class ?
2187 SemanticError( yylloc, "illegal syntax, useless storage qualifier(s) in empty aggregate declaration." ); $$ = nullptr;
2188 }
2189 }
2190 ;
2191
2192declaring_list:
2193 // A semantic check is required to ensure asm_name only appears on declarations with implicit or explicit static
2194 // storage-class
2195 variable_declarator asm_name_opt initializer_opt
2196 { $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
2197 | variable_type_redeclarator asm_name_opt initializer_opt
2198 { $$ = $1->addAsmName( $2 )->addInitializer( $3 ); }
2199
2200 | general_function_declarator asm_name_opt
2201 { $$ = $1->addAsmName( $2 )->addInitializer( nullptr ); }
2202 | general_function_declarator asm_name_opt '=' VOID
2203 { $$ = $1->addAsmName( $2 )->addInitializer( new InitializerNode( true ) ); }
2204
2205 | declaring_list ',' attribute_list_opt declarator asm_name_opt initializer_opt
2206 { $$ = $1->set_last( $4->addQualifiers( $3 )->addAsmName( $5 )->addInitializer( $6 ) ); }
2207 ;
2208
2209general_function_declarator:
2210 function_type_redeclarator
2211 | function_declarator
2212 ;
2213
2214declaration_specifier: // type specifier + storage class
2215 basic_declaration_specifier
2216 | type_declaration_specifier
2217 | sue_declaration_specifier
2218 | sue_declaration_specifier invalid_types // invalid syntax rule
2219 {
2220 SemanticError( yylloc, "illegal syntax, expecting ';' at end of \"%s\" declaration.",
2221 ast::AggregateDecl::aggrString( $1->type->aggregate.kind ) );
2222 $$ = nullptr;
2223 }
2224 ;
2225
2226invalid_types:
2227 aggregate_key
2228 | basic_type_name
2229 | indirect_type
2230 ;
2231
2232declaration_specifier_nobody: // type specifier + storage class - {...}
2233 // Preclude SUE declarations in restricted scopes:
2234 //
2235 // int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
2236 //
2237 // because it is impossible to call f due to name equivalence.
2238 basic_declaration_specifier
2239 | sue_declaration_specifier_nobody
2240 | type_declaration_specifier
2241 ;
2242
2243type_specifier: // type specifier
2244 basic_type_specifier
2245 | sue_type_specifier
2246 | type_type_specifier
2247 ;
2248
2249type_specifier_nobody: // type specifier - {...}
2250 // Preclude SUE declarations in restricted scopes:
2251 //
2252 // int f( struct S { int i; } s1, Struct S s2 ) { struct S s3; ... }
2253 //
2254 // because it is impossible to call f due to name equivalence.
2255 basic_type_specifier
2256 | sue_type_specifier_nobody
2257 | type_type_specifier
2258 ;
2259
2260type_qualifier_list_opt: // GCC, used in asm_statement
2261 // empty
2262 { $$ = nullptr; }
2263 | type_qualifier_list
2264 ;
2265
2266type_qualifier_list:
2267 // A semantic check is necessary to ensure a type qualifier is appropriate for the kind of declaration.
2268 //
2269 // ISO/IEC 9899:1999 Section 6.7.3(4 ) : If the same qualifier appears more than once in the same
2270 // specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it
2271 // appeared only once.
2272 type_qualifier
2273 | type_qualifier_list type_qualifier
2274 { $$ = $1->addQualifiers( $2 ); }
2275 ;
2276
2277type_qualifier:
2278 type_qualifier_name
2279 { $$ = DeclarationNode::newFromTypeData( $1 ); }
2280 | attribute // trick handles most attribute locations
2281 ;
2282
2283type_qualifier_name:
2284 CONST
2285 { $$ = build_type_qualifier( ast::CV::Const ); }
2286 | RESTRICT
2287 { $$ = build_type_qualifier( ast::CV::Restrict ); }
2288 | VOLATILE
2289 { $$ = build_type_qualifier( ast::CV::Volatile ); }
2290 | ATOMIC
2291 { $$ = build_type_qualifier( ast::CV::Atomic ); }
2292
2293 // forall is a CV qualifier because it can appear in places where SC qualifiers are disallowed.
2294 //
2295 // void foo( forall( T ) T (*)( T ) ); // forward declaration
2296 // void bar( static int ); // static disallowed (gcc/CFA)
2297 | forall
2298 { $$ = build_forall( $1 ); }
2299 ;
2300
2301forall:
2302 FORALL '(' type_parameter_list ')' // CFA
2303 { $$ = $3; }
2304 ;
2305
2306declaration_qualifier_list:
2307 storage_class_list
2308 | type_qualifier_list storage_class_list // remaining OBSOLESCENT (see 2 )
2309 { $$ = $1->addQualifiers( $2 ); }
2310 | declaration_qualifier_list type_qualifier_list storage_class_list
2311 { $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2312 ;
2313
2314storage_class_list:
2315 // A semantic check is necessary to ensure a storage class is appropriate for the kind of declaration and that
2316 // only one of each is specified, except for inline, which can appear with the others.
2317 //
2318 // ISO/IEC 9899:1999 Section 6.7.1(2) : At most, one storage-class specifier may be given in the declaration
2319 // specifiers in a declaration.
2320 storage_class
2321 | storage_class_list storage_class
2322 { $$ = $1->addQualifiers( $2 ); }
2323 ;
2324
2325storage_class:
2326 EXTERN
2327 { $$ = DeclarationNode::newStorageClass( ast::Storage::Extern ); }
2328 | STATIC
2329 { $$ = DeclarationNode::newStorageClass( ast::Storage::Static ); }
2330 | AUTO
2331 { $$ = DeclarationNode::newStorageClass( ast::Storage::Auto ); }
2332 | REGISTER
2333 { $$ = DeclarationNode::newStorageClass( ast::Storage::Register ); }
2334 | THREADLOCALGCC // GCC
2335 { $$ = DeclarationNode::newStorageClass( ast::Storage::ThreadLocalGcc ); }
2336 | THREADLOCALC11 // C11
2337 { $$ = DeclarationNode::newStorageClass( ast::Storage::ThreadLocalC11 ); }
2338 // Put function specifiers here to simplify parsing rules, but separate them semantically.
2339 | INLINE // C99
2340 { $$ = DeclarationNode::newFuncSpecifier( ast::Function::Inline ); }
2341 | FORTRAN // C99
2342 { $$ = DeclarationNode::newFuncSpecifier( ast::Function::Fortran ); }
2343 | NORETURN // C11
2344 { $$ = DeclarationNode::newFuncSpecifier( ast::Function::Noreturn ); }
2345 ;
2346
2347basic_type_name:
2348 basic_type_name_type
2349 { $$ = DeclarationNode::newFromTypeData( $1 ); }
2350 ;
2351
2352// Just an intermediate value for conversion.
2353basic_type_name_type:
2354 VOID
2355 { $$ = build_basic_type( TypeData::Void ); }
2356 | BOOL // C99
2357 { $$ = build_basic_type( TypeData::Bool ); }
2358 | CHAR
2359 { $$ = build_basic_type( TypeData::Char ); }
2360 | INT
2361 { $$ = build_basic_type( TypeData::Int ); }
2362 | INT128
2363 { $$ = build_basic_type( TypeData::Int128 ); }
2364 | UINT128
2365 { $$ = addType( build_basic_type( TypeData::Int128 ), build_signedness( TypeData::Unsigned ) ); }
2366 | FLOAT
2367 { $$ = build_basic_type( TypeData::Float ); }
2368 | DOUBLE
2369 { $$ = build_basic_type( TypeData::Double ); }
2370 | FLOAT80
2371 { $$ = build_basic_type( TypeData::Float80 ); }
2372 | uuFLOAT128
2373 { $$ = build_basic_type( TypeData::uuFloat128 ); }
2374 | FLOAT16
2375 { $$ = build_basic_type( TypeData::Float16 ); }
2376 | FLOAT32
2377 { $$ = build_basic_type( TypeData::Float32 ); }
2378 | FLOAT32X
2379 { $$ = build_basic_type( TypeData::Float32x ); }
2380 | FLOAT64
2381 { $$ = build_basic_type( TypeData::Float64 ); }
2382 | FLOAT64X
2383 { $$ = build_basic_type( TypeData::Float64x ); }
2384 | FLOAT128
2385 { $$ = build_basic_type( TypeData::Float128 ); }
2386 // https://developer.arm.com/documentation/den0018/a/NEON-Intrinsics/Accessing-vector-types-from-C
2387 | FLOAT128X
2388 { $$ = build_basic_type( TypeData::Float128x ); }
2389 | FLOAT32X4
2390 { $$ = build_basic_type( TypeData::Float32x4 ); }
2391 | FLOAT64X2
2392 { $$ = build_basic_type( TypeData::Float64x2 ); }
2393 | SVFLOAT32
2394 { $$ = build_basic_type( TypeData::Svfloat32 ); }
2395 | SVFLOAT64
2396 { $$ = build_basic_type( TypeData::Svfloat64 ); }
2397 | SVBOOL
2398 { $$ = build_basic_type( TypeData::Svbool ); }
2399 | DECIMAL32
2400 { SemanticError( yylloc, "_Decimal32 is currently unimplemented." ); $$ = nullptr; }
2401 | DECIMAL64
2402 { SemanticError( yylloc, "_Decimal64 is currently unimplemented." ); $$ = nullptr; }
2403 | DECIMAL128
2404 { SemanticError( yylloc, "_Decimal128 is currently unimplemented." ); $$ = nullptr; }
2405 | COMPLEX // C99
2406 { $$ = build_complex_type( TypeData::Complex ); }
2407 | IMAGINARY // C99
2408 { $$ = build_complex_type( TypeData::Imaginary ); }
2409 | SIGNED
2410 { $$ = build_signedness( TypeData::Signed ); }
2411 | UNSIGNED
2412 { $$ = build_signedness( TypeData::Unsigned ); }
2413 | SHORT
2414 { $$ = build_length( TypeData::Short ); }
2415 | LONG
2416 { $$ = build_length( TypeData::Long ); }
2417 | VA_LIST // GCC, __builtin_va_list
2418 { $$ = build_builtin_type( TypeData::Valist ); }
2419 | AUTO_TYPE
2420 { $$ = build_builtin_type( TypeData::AutoType ); }
2421 | vtable
2422 ;
2423
2424vtable_opt:
2425 // empty
2426 { $$ = nullptr; }
2427 | vtable
2428 ;
2429
2430vtable:
2431 VTABLE '(' type_name ')' default_opt
2432 { $$ = build_vtable_type( $3 ); }
2433 ;
2434
2435default_opt:
2436 // empty
2437 { $$ = nullptr; }
2438 | DEFAULT
2439 { SemanticError( yylloc, "vtable default is currently unimplemented." ); $$ = nullptr; }
2440 ;
2441
2442basic_declaration_specifier:
2443 // A semantic check is necessary for conflicting storage classes.
2444 basic_type_specifier
2445 | declaration_qualifier_list basic_type_specifier
2446 { $$ = $2->addQualifiers( $1 ); }
2447 | basic_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2448 { $$ = $1->addQualifiers( $2 ); }
2449 | basic_declaration_specifier storage_class type_qualifier_list
2450 { $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2451 | basic_declaration_specifier storage_class basic_type_specifier
2452 { $$ = $3->addQualifiers( $2 )->addType( $1 ); }
2453 ;
2454
2455basic_type_specifier:
2456 direct_type
2457 // Cannot have type modifiers, e.g., short, long, etc.
2458 | type_qualifier_list_opt indirect_type type_qualifier_list_opt
2459 { $$ = $2->addQualifiers( $1 )->addQualifiers( $3 ); }
2460 ;
2461
2462direct_type:
2463 basic_type_name
2464 | type_qualifier_list basic_type_name
2465 { $$ = $2->addQualifiers( $1 ); }
2466 | direct_type type_qualifier
2467 { $$ = $1->addQualifiers( $2 ); }
2468 | direct_type basic_type_name
2469 { $$ = $1->addType( $2 ); }
2470 ;
2471
2472indirect_type:
2473 TYPEOF '(' type ')' // GCC: typeof( x ) y;
2474 { $$ = $3; }
2475 | TYPEOF '(' comma_expression ')' // GCC: typeof( a+b ) y;
2476 { $$ = DeclarationNode::newTypeof( $3 ); }
2477 | BASETYPEOF '(' type ')' // CFA: basetypeof( x ) y;
2478 { $$ = DeclarationNode::newTypeof( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ), true ); }
2479 | BASETYPEOF '(' comma_expression ')' // CFA: basetypeof( a+b ) y;
2480 { $$ = DeclarationNode::newTypeof( $3, true ); }
2481 | ZERO_T // CFA
2482 { $$ = DeclarationNode::newFromTypeData( build_builtin_type( TypeData::Zero ) ); }
2483 | ONE_T // CFA
2484 { $$ = DeclarationNode::newFromTypeData( build_builtin_type( TypeData::One ) ); }
2485 ;
2486
2487sue_declaration_specifier: // struct, union, enum + storage class + type specifier
2488 sue_type_specifier
2489 | declaration_qualifier_list sue_type_specifier
2490 { $$ = $2->addQualifiers( $1 ); }
2491 | sue_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2492 { $$ = $1->addQualifiers( $2 ); }
2493 | sue_declaration_specifier storage_class type_qualifier_list
2494 { $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2495 ;
2496
2497sue_type_specifier: // struct, union, enum + type specifier
2498 elaborated_type
2499 | type_qualifier_list
2500 { if ( $1->type != nullptr && $1->type->forall ) forall = true; } // remember generic type
2501 elaborated_type
2502 { $$ = $3->addQualifiers( $1 ); }
2503 | sue_type_specifier type_qualifier
2504 {
2505 if ( $2->type != nullptr && $2->type->forall ) forall = true; // remember generic type
2506 $$ = $1->addQualifiers( $2 );
2507 }
2508 ;
2509
2510sue_declaration_specifier_nobody: // struct, union, enum - {...} + storage class + type specifier
2511 sue_type_specifier_nobody
2512 | declaration_qualifier_list sue_type_specifier_nobody
2513 { $$ = $2->addQualifiers( $1 ); }
2514 | sue_declaration_specifier_nobody storage_class // remaining OBSOLESCENT (see 2)
2515 { $$ = $1->addQualifiers( $2 ); }
2516 | sue_declaration_specifier_nobody storage_class type_qualifier_list
2517 { $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2518 ;
2519
2520sue_type_specifier_nobody: // struct, union, enum - {...} + type specifier
2521 elaborated_type_nobody
2522 | type_qualifier_list elaborated_type_nobody
2523 { $$ = $2->addQualifiers( $1 ); }
2524 | sue_type_specifier_nobody type_qualifier
2525 { $$ = $1->addQualifiers( $2 ); }
2526 ;
2527
2528type_declaration_specifier:
2529 type_type_specifier
2530 | declaration_qualifier_list type_type_specifier
2531 { $$ = $2->addQualifiers( $1 ); }
2532 | type_declaration_specifier storage_class // remaining OBSOLESCENT (see 2)
2533 { $$ = $1->addQualifiers( $2 ); }
2534 | type_declaration_specifier storage_class type_qualifier_list
2535 { $$ = $1->addQualifiers( $2 )->addQualifiers( $3 ); }
2536 ;
2537
2538type_type_specifier: // typedef types
2539 type_name
2540 { $$ = DeclarationNode::newFromTypeData( $1 ); }
2541 | type_qualifier_list type_name
2542 { $$ = DeclarationNode::newFromTypeData( $2 )->addQualifiers( $1 ); }
2543 | type_type_specifier type_qualifier
2544 { $$ = $1->addQualifiers( $2 ); }
2545 ;
2546
2547type_name:
2548 TYPEDEFname
2549 { $$ = build_typedef( $1 ); }
2550 | '.' TYPEDEFname
2551 { $$ = build_qualified_type( build_global_scope(), build_typedef( $2 ) ); }
2552 | type_name '.' TYPEDEFname
2553 { $$ = build_qualified_type( $1, build_typedef( $3 ) ); }
2554 | typegen_name
2555 | '.' typegen_name
2556 { $$ = build_qualified_type( build_global_scope(), $2 ); }
2557 | type_name '.' typegen_name
2558 { $$ = build_qualified_type( $1, $3 ); }
2559 ;
2560
2561typegen_name: // CFA
2562 TYPEGENname
2563 { $$ = build_type_gen( $1, nullptr ); }
2564 | TYPEGENname '(' ')'
2565 { $$ = build_type_gen( $1, nullptr ); }
2566 | TYPEGENname '(' type_list ')'
2567 { $$ = build_type_gen( $1, $3 ); }
2568 ;
2569
2570elaborated_type: // struct, union, enum
2571 aggregate_type
2572 | enum_type
2573 ;
2574
2575elaborated_type_nobody: // struct, union, enum - {...}
2576 aggregate_type_nobody
2577 | enum_type_nobody
2578 ;
2579
2580// ************************** AGGREGATE *******************************
2581
2582aggregate_type: // struct, union
2583 aggregate_key attribute_list_opt
2584 { forall = false; } // reset
2585 '{' field_declaration_list_opt '}' type_parameters_opt
2586 { $$ = DeclarationNode::newAggregate( $1, nullptr, $7, $5, true )->addQualifiers( $2 ); }
2587 | aggregate_key attribute_list_opt identifier
2588 {
2589 typedefTable.makeTypedef( *$3, forall || typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 1" );
2590 forall = false; // reset
2591 }
2592 '{' field_declaration_list_opt '}' type_parameters_opt
2593 {
2594 $$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2595 }
2596 | aggregate_key attribute_list_opt TYPEDEFname // unqualified type name
2597 {
2598 typedefTable.makeTypedef( *$3, forall || typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 2" );
2599 forall = false; // reset
2600 }
2601 '{' field_declaration_list_opt '}' type_parameters_opt
2602 {
2603 DeclarationNode::newFromTypeData( build_typedef( $3 ) );
2604 $$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2605 }
2606 | aggregate_key attribute_list_opt TYPEGENname // unqualified type name
2607 {
2608 typedefTable.makeTypedef( *$3, forall || typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type: 3" );
2609 forall = false; // reset
2610 }
2611 '{' field_declaration_list_opt '}' type_parameters_opt
2612 {
2613 DeclarationNode::newFromTypeData( build_type_gen( $3, nullptr ) );
2614 $$ = DeclarationNode::newAggregate( $1, $3, $8, $6, true )->addQualifiers( $2 );
2615 }
2616 | aggregate_type_nobody
2617 ;
2618
2619type_parameters_opt:
2620 // empty
2621 { $$ = nullptr; } %prec '}'
2622 | '(' type_list ')'
2623 { $$ = $2; }
2624 ;
2625
2626aggregate_type_nobody: // struct, union - {...}
2627 aggregate_key attribute_list_opt identifier
2628 {
2629 typedefTable.makeTypedef( *$3, forall || typedefTable.getEnclForall() ? TYPEGENname : TYPEDEFname, "aggregate_type_nobody" );
2630 forall = false; // reset
2631 $$ = DeclarationNode::newAggregate( $1, $3, nullptr, nullptr, false )->addQualifiers( $2 );
2632 }
2633 | aggregate_key attribute_list_opt type_name
2634 {
2635 forall = false; // reset
2636 // Create new generic declaration with same name as previous forward declaration, where the IDENTIFIER is
2637 // switched to a TYPEGENname. Link any generic arguments from typegen_name to new generic declaration and
2638 // delete newFromTypeGen.
2639 if ( $3->kind == TypeData::SymbolicInst && ! $3->symbolic.isTypedef ) {
2640 $$ = DeclarationNode::newFromTypeData( $3 )->addQualifiers( $2 );
2641 } else {
2642 $$ = DeclarationNode::newAggregate( $1, $3->symbolic.name, $3->symbolic.actuals, nullptr, false )->addQualifiers( $2 );
2643 $3->symbolic.name = nullptr; // copied to $$
2644 $3->symbolic.actuals = nullptr;
2645 delete $3;
2646 }
2647 }
2648 ;
2649
2650aggregate_key:
2651 aggregate_data
2652 | aggregate_control
2653 ;
2654
2655aggregate_data:
2656 STRUCT vtable_opt
2657 { $$ = ast::AggregateDecl::Struct; }
2658 | UNION
2659 { $$ = ast::AggregateDecl::Union; }
2660 | EXCEPTION // CFA
2661 { $$ = ast::AggregateDecl::Exception; }
2662 ;
2663
2664aggregate_control: // CFA
2665 MONITOR
2666 { $$ = ast::AggregateDecl::Monitor; }
2667 | MUTEX STRUCT
2668 { $$ = ast::AggregateDecl::Monitor; }
2669 | GENERATOR
2670 { $$ = ast::AggregateDecl::Generator; }
2671 | MUTEX GENERATOR
2672 {
2673 SemanticError( yylloc, "monitor generator is currently unimplemented." );
2674 $$ = ast::AggregateDecl::NoAggregate;
2675 }
2676 | COROUTINE
2677 { $$ = ast::AggregateDecl::Coroutine; }
2678 | MUTEX COROUTINE
2679 {
2680 SemanticError( yylloc, "monitor coroutine is currently unimplemented." );
2681 $$ = ast::AggregateDecl::NoAggregate;
2682 }
2683 | THREAD
2684 { $$ = ast::AggregateDecl::Thread; }
2685 | MUTEX THREAD
2686 {
2687 SemanticError( yylloc, "monitor thread is currently unimplemented." );
2688 $$ = ast::AggregateDecl::NoAggregate;
2689 }
2690 ;
2691
2692field_declaration_list_opt:
2693 // empty
2694 { $$ = nullptr; }
2695 | field_declaration_list_opt field_declaration
2696 { $$ = $1 ? $1->set_last( $2 ) : $2; }
2697 ;
2698
2699field_declaration:
2700 type_specifier field_declaring_list_opt ';'
2701 {
2702 // printf( "type_specifier1 %p %s\n", $$, $$->type->aggregate.name ? $$->type->aggregate.name->c_str() : "(nil)" );
2703 $$ = fieldDecl( $1, $2 );
2704 // printf( "type_specifier2 %p %s\n", $$, $$->type->aggregate.name ? $$->type->aggregate.name->c_str() : "(nil)" );
2705 // for ( Attribute * attr: reverseIterate( $$->attributes ) ) {
2706 // printf( "\tattr %s\n", attr->name.c_str() );
2707 // } // for
2708 }
2709 | type_specifier field_declaring_list_opt '}' // invalid syntax rule
2710 {
2711 SemanticError( yylloc, "illegal syntax, expecting ';' at end of previous declaration." );
2712 $$ = nullptr;
2713 }
2714 | EXTENSION type_specifier field_declaring_list_opt ';' // GCC
2715 { $$ = fieldDecl( $2, $3 ); distExt( $$ ); }
2716 | STATIC type_specifier field_declaring_list_opt ';' // CFA
2717 { SemanticError( yylloc, "STATIC aggregate field qualifier currently unimplemented." ); $$ = nullptr; }
2718 | INLINE type_specifier field_abstract_list_opt ';' // CFA
2719 {
2720 if ( ! $3 ) { // field declarator ?
2721 $3 = DeclarationNode::newName( nullptr );
2722 } // if
2723 $3->inLine = true;
2724 $$ = distAttr( $2, $3 ); // mark all fields in list
2725 distInl( $3 );
2726 }
2727 | INLINE aggregate_control ';' // CFA
2728 { SemanticError( yylloc, "INLINE aggregate control currently unimplemented." ); $$ = nullptr; }
2729 | typedef_declaration ';' // CFA
2730 | cfa_field_declaring_list ';' // CFA, new style field declaration
2731 | EXTENSION cfa_field_declaring_list ';' // GCC
2732 { distExt( $2 ); $$ = $2; } // mark all fields in list
2733 | INLINE cfa_field_abstract_list ';' // CFA, new style field declaration
2734 { $$ = $2; } // mark all fields in list
2735 | cfa_typedef_declaration ';' // CFA
2736 | static_assert ';' // C11
2737 ;
2738
2739field_declaring_list_opt:
2740 // empty
2741 { $$ = nullptr; }
2742 | field_declarator
2743 | field_declaring_list_opt ',' attribute_list_opt field_declarator
2744 { $$ = $1->set_last( $4->addQualifiers( $3 ) ); }
2745 ;
2746
2747field_declarator:
2748 bit_subrange_size // C special case, no field name
2749 { $$ = DeclarationNode::newBitfield( $1 ); }
2750 | variable_declarator bit_subrange_size_opt
2751 // A semantic check is required to ensure bit_subrange only appears on integral types.
2752 { $$ = $1->addBitfield( $2 ); }
2753 | variable_type_redeclarator bit_subrange_size_opt
2754 // A semantic check is required to ensure bit_subrange only appears on integral types.
2755 { $$ = $1->addBitfield( $2 ); }
2756 | function_type_redeclarator bit_subrange_size_opt
2757 // A semantic check is required to ensure bit_subrange only appears on integral types.
2758 { $$ = $1->addBitfield( $2 ); }
2759 ;
2760
2761field_abstract_list_opt:
2762 // empty
2763 { $$ = nullptr; }
2764 | field_abstract
2765 | field_abstract_list_opt ',' attribute_list_opt field_abstract
2766 { $$ = $1->set_last( $4->addQualifiers( $3 ) ); }
2767 ;
2768
2769field_abstract:
2770 // no bit fields
2771 variable_abstract_declarator
2772 ;
2773
2774cfa_field_declaring_list: // CFA, new style field declaration
2775 // bit-fields are handled by C declarations
2776 cfa_abstract_declarator_tuple identifier_or_type_name
2777 { $$ = $1->addName( $2 ); }
2778 | cfa_field_declaring_list ',' identifier_or_type_name
2779 { $$ = $1->set_last( $1->cloneType( $3 ) ); }
2780 ;
2781
2782cfa_field_abstract_list: // CFA, new style field declaration
2783 // bit-fields are handled by C declarations
2784 cfa_abstract_declarator_tuple
2785 | cfa_field_abstract_list ','
2786 { $$ = $1->set_last( $1->cloneType( 0 ) ); }
2787 ;
2788
2789bit_subrange_size_opt:
2790 // empty
2791 { $$ = nullptr; }
2792 | bit_subrange_size
2793 ;
2794
2795bit_subrange_size:
2796 ':' assignment_expression
2797 { $$ = $2; }
2798 ;
2799
2800// ************************** ENUMERATION *******************************
2801
2802enum_type:
2803 // anonymous, no type name
2804 ENUM attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2805 {
2806 if ( $3 == EnumHiding::Hide ) {
2807 SemanticError( yylloc, "illegal syntax, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr;
2808 } // if
2809 $$ = DeclarationNode::newEnum( nullptr, $5, true, false )->addQualifiers( $2 );
2810 }
2811 | ENUM enumerator_type attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2812 {
2813 if ( $2 && ($2->storageClasses.val != 0 || $2->type->qualifiers.any()) ) {
2814 SemanticError( yylloc, "illegal syntax, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
2815 }
2816 if ( $4 == EnumHiding::Hide ) {
2817 SemanticError( yylloc, "illegal syntax, hiding ('!') the enumerator names of an anonymous enumeration means the names are inaccessible." ); $$ = nullptr;
2818 } // if
2819 $$ = DeclarationNode::newEnum( nullptr, $6, true, true, $2 )->addQualifiers( $3 );
2820 }
2821
2822 // named type
2823 | ENUM attribute_list_opt identifier
2824 { typedefTable.makeTypedef( *$3, "enum_type 1" ); }
2825 hide_opt '{' enumerator_list comma_opt '}'
2826 { $$ = DeclarationNode::newEnum( $3, $7, true, false, nullptr, $5 )->addQualifiers( $2 ); }
2827 | ENUM attribute_list_opt typedef_name hide_opt '{' enumerator_list comma_opt '}' // unqualified type name
2828 { $$ = DeclarationNode::newEnum( $3->name, $6, true, false, nullptr, $4 )->addQualifiers( $2 ); }
2829 | ENUM enumerator_type attribute_list_opt identifier attribute_list_opt
2830 {
2831 if ( $2 && ($2->storageClasses.any() || $2->type->qualifiers.val != 0) ) {
2832 SemanticError( yylloc, "illegal syntax, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
2833 }
2834 typedefTable.makeTypedef( *$4, "enum_type 2" );
2835 }
2836 hide_opt '{' enumerator_list comma_opt '}'
2837 { $$ = DeclarationNode::newEnum( $4, $9, true, true, $2, $7 )->addQualifiers( $3 )->addQualifiers( $5 ); }
2838 | ENUM enumerator_type attribute_list_opt typedef_name attribute_list_opt hide_opt '{' enumerator_list comma_opt '}'
2839 { $$ = DeclarationNode::newEnum( $4->name, $8, true, true, $2, $6 )->addQualifiers( $3 )->addQualifiers( $5 ); }
2840
2841 // forward declaration
2842 | enum_type_nobody
2843 ;
2844
2845enumerator_type:
2846 '(' ')' // pure enumeration
2847 { $$ = nullptr; }
2848 | '(' cfa_abstract_parameter_declaration ')' // typed enumeration
2849 { $$ = $2; }
2850 ;
2851
2852hide_opt:
2853 // empty
2854 { $$ = EnumHiding::Visible; }
2855 | '!'
2856 { $$ = EnumHiding::Hide; }
2857 ;
2858
2859enum_type_nobody: // enum - {...}
2860 ENUM attribute_list_opt identifier
2861 {
2862 typedefTable.makeTypedef( *$3, "enum_type_nobody 1" );
2863 $$ = DeclarationNode::newEnum( $3, nullptr, false, false )->addQualifiers( $2 );
2864 }
2865 | ENUM attribute_list_opt type_name
2866 {
2867 typedefTable.makeTypedef( *$3->symbolic.name, "enum_type_nobody 2" );
2868 $$ = DeclarationNode::newEnum( $3->symbolic.name, nullptr, false, false )->addQualifiers( $2 );
2869 }
2870 ;
2871
2872enumerator_list:
2873 // empty
2874 { SemanticError( yylloc, "enumeration must have a minimum of one enumerator, empty enumerator list is meaningless." ); $$ = nullptr; }
2875 | visible_hide_opt identifier_or_type_name enumerator_value_opt
2876 { $$ = DeclarationNode::newEnumValueGeneric( $2, $3 ); }
2877 | INLINE type_name
2878 {
2879 $$ = DeclarationNode::newEnumInLine( $2->symbolic.name );
2880 $2->symbolic.name = nullptr;
2881 delete $2;
2882 }
2883 | enumerator_list ',' visible_hide_opt identifier_or_type_name enumerator_value_opt
2884 { $$ = $1->set_last( DeclarationNode::newEnumValueGeneric( $4, $5 ) ); }
2885 | enumerator_list ',' INLINE type_name
2886 { $$ = $1->set_last( DeclarationNode::newEnumInLine( $4->symbolic.name ) ); }
2887 ;
2888
2889visible_hide_opt:
2890 hide_opt
2891 | '^'
2892 { $$ = EnumHiding::Visible; }
2893 ;
2894
2895enumerator_value_opt:
2896 // empty
2897 { $$ = nullptr; }
2898 | '=' constant_expression { $$ = new InitializerNode( $2 ); }
2899 | '=' '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $3, true ); }
2900 // | simple_assignment_operator initializer
2901 // { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
2902 ;
2903
2904// ************************** FUNCTION PARAMETERS *******************************
2905
2906parameter_list_ellipsis_opt:
2907 // empty
2908 { $$ = DeclarationNode::newFromTypeData( build_basic_type( TypeData::Void ) ); }
2909 | ELLIPSIS
2910 { $$ = nullptr; }
2911 | parameter_list
2912 | parameter_list ',' ELLIPSIS
2913 { $$ = $1->addVarArgs(); }
2914 ;
2915
2916parameter_list: // abstract + real
2917 parameter_declaration
2918 | abstract_parameter_declaration
2919 | parameter_list ',' parameter_declaration
2920 { $$ = $1->set_last( $3 ); }
2921 | parameter_list ',' abstract_parameter_declaration
2922 { $$ = $1->set_last( $3 ); }
2923 ;
2924
2925cfa_parameter_list_ellipsis_opt: // CFA, abstract + real
2926 // empty
2927 { $$ = DeclarationNode::newFromTypeData( build_basic_type( TypeData::Void ) ); }
2928 | ELLIPSIS
2929 { $$ = nullptr; }
2930 | cfa_parameter_list
2931 | cfa_abstract_parameter_list
2932 | cfa_parameter_list ',' cfa_abstract_parameter_list
2933 { $$ = $1->set_last( $3 ); }
2934 | cfa_parameter_list ',' ELLIPSIS
2935 { $$ = $1->addVarArgs(); }
2936 | cfa_abstract_parameter_list ',' ELLIPSIS
2937 { $$ = $1->addVarArgs(); }
2938 ;
2939
2940cfa_parameter_list: // CFA
2941 // To obtain LR(1) between cfa_parameter_list and cfa_abstract_tuple, the last cfa_abstract_parameter_list is
2942 // factored out from cfa_parameter_list, flattening the rules to get lookahead to the ']'.
2943 cfa_parameter_declaration
2944 | cfa_abstract_parameter_list ',' cfa_parameter_declaration
2945 { $$ = $1->set_last( $3 ); }
2946 | cfa_parameter_list ',' cfa_parameter_declaration
2947 { $$ = $1->set_last( $3 ); }
2948 | cfa_parameter_list ',' cfa_abstract_parameter_list ',' cfa_parameter_declaration
2949 { $$ = $1->set_last( $3 )->set_last( $5 ); }
2950 ;
2951
2952cfa_abstract_parameter_list: // CFA, new & old style abstract
2953 cfa_abstract_parameter_declaration
2954 | cfa_abstract_parameter_list ',' cfa_abstract_parameter_declaration
2955 { $$ = $1->set_last( $3 ); }
2956 ;
2957
2958// Provides optional identifier names (abstract_declarator/variable_declarator), no initialization, different semantics
2959// for typedef name by using type_parameter_redeclarator instead of typedef_redeclarator, and function prototypes.
2960
2961parameter_declaration:
2962 // No SUE declaration in parameter list.
2963 declaration_specifier_nobody identifier_parameter_declarator default_initializer_opt
2964 { $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2965 | declaration_specifier_nobody type_parameter_redeclarator default_initializer_opt
2966 { $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2967 ;
2968
2969abstract_parameter_declaration:
2970 declaration_specifier_nobody default_initializer_opt
2971 { $$ = $1->addInitializer( $2 ? new InitializerNode( $2 ) : nullptr ); }
2972 | declaration_specifier_nobody abstract_parameter_declarator default_initializer_opt
2973 { $$ = $2->addType( $1 )->addInitializer( $3 ? new InitializerNode( $3 ) : nullptr ); }
2974 ;
2975
2976cfa_parameter_declaration: // CFA, new & old style parameter declaration
2977 parameter_declaration
2978 | cfa_identifier_parameter_declarator_no_tuple identifier_or_type_name default_initializer_opt
2979 { $$ = $1->addName( $2 ); }
2980 | cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2981 // To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2982 { $$ = $1->addName( $2 ); }
2983 | type_qualifier_list cfa_abstract_tuple identifier_or_type_name default_initializer_opt
2984 { $$ = $2->addName( $3 )->addQualifiers( $1 ); }
2985 | cfa_function_specifier // int f( "int fp()" );
2986 ;
2987
2988cfa_abstract_parameter_declaration: // CFA, new & old style parameter declaration
2989 abstract_parameter_declaration
2990 | cfa_identifier_parameter_declarator_no_tuple
2991 | cfa_abstract_tuple
2992 // To obtain LR(1), these rules must be duplicated here (see cfa_abstract_declarator).
2993 | type_qualifier_list cfa_abstract_tuple
2994 { $$ = $2->addQualifiers( $1 ); }
2995 | cfa_abstract_function // int f( "int ()" );
2996 ;
2997
2998// ISO/IEC 9899:1999 Section 6.9.1(6) : "An identifier declared as a typedef name shall not be redeclared as a
2999// parameter." Because the scope of the K&R-style parameter-list sees the typedef first, the following is based only on
3000// identifiers. The ANSI-style parameter-list can redefine a typedef name.
3001
3002identifier_list: // K&R-style parameter list => no types
3003 identifier
3004 { $$ = DeclarationNode::newName( $1 ); }
3005 | identifier_list ',' identifier
3006 { $$ = $1->set_last( DeclarationNode::newName( $3 ) ); }
3007 ;
3008
3009type_no_function: // sizeof, alignof, cast (constructor)
3010 cfa_abstract_declarator_tuple // CFA
3011 | type_specifier // cannot be type_specifier_nobody, e.g., (struct S {}){} is a thing
3012 | type_specifier abstract_declarator
3013 { $$ = $2->addType( $1 ); }
3014 ;
3015
3016type: // typeof, assertion
3017 type_no_function
3018 | cfa_abstract_function // CFA
3019 ;
3020
3021initializer_opt:
3022 // empty
3023 { $$ = nullptr; }
3024 | simple_assignment_operator initializer { $$ = $1 == OperKinds::Assign ? $2 : $2->set_maybeConstructed( false ); }
3025 | '=' VOID { $$ = new InitializerNode( true ); }
3026 | '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
3027 ;
3028
3029initializer:
3030 assignment_expression { $$ = new InitializerNode( $1 ); }
3031 | '{' initializer_list_opt comma_opt '}' { $$ = new InitializerNode( $2, true ); }
3032 ;
3033
3034initializer_list_opt:
3035 // empty
3036 { $$ = nullptr; }
3037 | initializer
3038 | designation initializer { $$ = $2->set_designators( $1 ); }
3039 | initializer_list_opt ',' initializer { $$ = $1->set_last( $3 ); }
3040 | initializer_list_opt ',' designation initializer { $$ = $1->set_last( $4->set_designators( $3 ) ); }
3041 ;
3042
3043// There is an unreconcileable parsing problem between C99 and CFA with respect to designators. The problem is use of
3044// '=' to separator the designator from the initializer value, as in:
3045//
3046// int x[10] = { [1] = 3 };
3047//
3048// The string "[1] = 3" can be parsed as a designator assignment or a tuple assignment. To disambiguate this case, CFA
3049// changes the syntax from "=" to ":" as the separator between the designator and initializer. GCC does uses ":" for
3050// field selection. The optional use of the "=" in GCC, or in this case ":", cannot be supported either due to
3051// shift/reduce conflicts
3052
3053designation:
3054 designator_list '=' // C99, CFA uses ":" instead of "="
3055 | identifier_at ':' // GCC, field name, obsolete since GCC 2.5
3056 { $$ = new ExpressionNode( build_varref( yylloc, $1 ) ); }
3057 ;
3058
3059designator_list: // C99
3060 designator
3061 | designator_list designator
3062 { $$ = $1->set_last( $2 ); }
3063 ;
3064
3065designator:
3066 '.' identifier_at // C99, field name
3067 { $$ = new ExpressionNode( build_varref( yylloc, $2 ) ); }
3068 | '[' constant_expression ']' // C99, single array element
3069 { $$ = $2; }
3070 | '[' subrange ']' // CFA, multiple array elements
3071 { $$ = $2; }
3072 | '[' constant_expression ELLIPSIS constant_expression ']' // GCC, multiple array elements
3073 { $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $2 ), maybeMoveBuild( $4 ) ) ); }
3074 | '.' '[' field_name_list ']' // CFA, tuple field selector
3075 { $$ = $3; }
3076 ;
3077
3078// The CFA type system is based on parametric polymorphism, the ability to declare functions with type parameters,
3079// rather than an object-oriented type system. This required four groups of extensions:
3080//
3081// Overloading: function, data, and operator identifiers may be overloaded.
3082//
3083// Type declarations: "otype" is used to generate new types for declaring objects. Similarly, "dtype" is used for object
3084// and incomplete types, and "ftype" is used for function types. Type declarations with initializers provide
3085// definitions of new types. Type declarations with storage class "extern" provide opaque types.
3086//
3087// Polymorphic functions: A forall clause declares a type parameter. The corresponding argument is inferred at the call
3088// site. A polymorphic function is not a template; it is a function, with an address and a type.
3089//
3090// Specifications and Assertions: Specifications are collections of declarations parameterized by one or more
3091// types. They serve many of the purposes of abstract classes, and specification hierarchies resemble subclass
3092// hierarchies. Unlike classes, they can define relationships between types. Assertions declare that a type or
3093// types provide the operations declared by a specification. Assertions are normally used to declare requirements
3094// on type arguments of polymorphic functions.
3095
3096type_parameter_list: // CFA
3097 type_parameter
3098 | type_parameter_list ',' type_parameter
3099 { $$ = $1->set_last( $3 ); }
3100 ;
3101
3102type_initializer_opt: // CFA
3103 // empty
3104 { $$ = nullptr; }
3105 | '=' type
3106 { $$ = $2; }
3107 ;
3108
3109type_parameter: // CFA
3110 type_class identifier_or_type_name
3111 {
3112 typedefTable.addToScope( *$2, TYPEDEFname, "type_parameter 1" );
3113 if ( $1 == ast::TypeDecl::Otype ) { SemanticError( yylloc, "otype keyword is deprecated, use T " ); }
3114 if ( $1 == ast::TypeDecl::Dtype ) { SemanticError( yylloc, "dtype keyword is deprecated, use T &" ); }
3115 if ( $1 == ast::TypeDecl::Ttype ) { SemanticError( yylloc, "ttype keyword is deprecated, use T ..." ); }
3116 }
3117 type_initializer_opt assertion_list_opt
3118 { $$ = DeclarationNode::newTypeParam( $1, $2 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
3119 | identifier_or_type_name new_type_class
3120 { typedefTable.addToScope( *$1, TYPEDEFname, "type_parameter 2" ); }
3121 type_initializer_opt assertion_list_opt
3122 { $$ = DeclarationNode::newTypeParam( $2, $1 )->addTypeInitializer( $4 )->addAssertions( $5 ); }
3123 | '[' identifier_or_type_name ']'
3124 {
3125 typedefTable.addToScope( *$2, TYPEDIMname, "type_parameter 3" );
3126 $$ = DeclarationNode::newTypeParam( ast::TypeDecl::Dimension, $2 );
3127 }
3128 // | type_specifier identifier_parameter_declarator
3129 | assertion_list
3130 { $$ = DeclarationNode::newTypeParam( ast::TypeDecl::Dtype, new string( DeclarationNode::anonymous.newName() ) )->addAssertions( $1 ); }
3131 | ENUM '(' identifier_or_type_name ')' identifier_or_type_name new_type_class type_initializer_opt assertion_list_opt
3132 {
3133 typedefTable.addToScope( *$3, TYPEDIMname, "type_parameter 4" );
3134 typedefTable.addToScope( *$5, TYPEDIMname, "type_parameter 5" );
3135 $$ = DeclarationNode::newTypeParam( $6, $5 )->addTypeInitializer( $7 )->addAssertions( $8 );
3136 }
3137 ;
3138
3139new_type_class: // CFA
3140 // empty
3141 { $$ = ast::TypeDecl::Otype; }
3142 | '&'
3143 { $$ = ast::TypeDecl::Dtype; }
3144 | '*'
3145 { $$ = ast::TypeDecl::DStype; } // Dtype + sized
3146 // | '(' '*' ')' // Gregor made me do it
3147 // { $$ = ast::TypeDecl::Ftype; }
3148 | ELLIPSIS
3149 { $$ = ast::TypeDecl::Ttype; }
3150 ;
3151
3152type_class: // CFA
3153 OTYPE
3154 { $$ = ast::TypeDecl::Otype; }
3155 | DTYPE
3156 { $$ = ast::TypeDecl::Dtype; }
3157 | FTYPE
3158 { $$ = ast::TypeDecl::Ftype; }
3159 | TTYPE
3160 { $$ = ast::TypeDecl::Ttype; }
3161 ;
3162
3163assertion_list_opt: // CFA
3164 // empty
3165 { $$ = nullptr; }
3166 | assertion_list
3167 ;
3168
3169assertion_list: // CFA
3170 assertion
3171 | assertion_list assertion
3172 { $$ = $1->set_last( $2 ); }
3173 ;
3174
3175assertion: // CFA
3176 '|' identifier_or_type_name '(' type_list ')'
3177 { $$ = DeclarationNode::newTraitUse( $2, $4 ); }
3178 | '|' '{' trait_declaration_list '}'
3179 { $$ = $3; }
3180 // | '|' '(' push type_parameter_list pop ')' '{' push trait_declaration_list pop '}' '(' type_list ')'
3181 // { SemanticError( yylloc, "Generic data-type assertion is currently unimplemented." ); $$ = nullptr; }
3182 ;
3183
3184type_list: // CFA
3185 type
3186 { $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
3187 | assignment_expression
3188 | type_list ',' type
3189 { $$ = $1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) ); }
3190 | type_list ',' assignment_expression
3191 { $$ = $1->set_last( $3 ); }
3192 ;
3193
3194type_declaring_list: // CFA
3195 OTYPE type_declarator
3196 { $$ = $2; }
3197 | storage_class_list OTYPE type_declarator
3198 { $$ = $3->addQualifiers( $1 ); }
3199 | type_declaring_list ',' type_declarator
3200 { $$ = $1->set_last( $3->copySpecifiers( $1 ) ); }
3201 ;
3202
3203type_declarator: // CFA
3204 type_declarator_name assertion_list_opt
3205 { $$ = $1->addAssertions( $2 ); }
3206 | type_declarator_name assertion_list_opt '=' type
3207 { $$ = $1->addAssertions( $2 )->addType( $4 ); }
3208 ;
3209
3210type_declarator_name: // CFA
3211 identifier_or_type_name
3212 {
3213 typedefTable.addToEnclosingScope( *$1, TYPEDEFname, "type_declarator_name 1" );
3214 $$ = DeclarationNode::newTypeDecl( $1, nullptr );
3215 }
3216 | identifier_or_type_name '(' type_parameter_list ')'
3217 {
3218 typedefTable.addToEnclosingScope( *$1, TYPEGENname, "type_declarator_name 2" );
3219 $$ = DeclarationNode::newTypeDecl( $1, $3 );
3220 }
3221 ;
3222
3223trait_specifier: // CFA
3224 TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' '}'
3225 {
3226 SemanticWarning( yylloc, Warning::DeprecTraitSyntax );
3227 $$ = DeclarationNode::newTrait( $2, $4, nullptr );
3228 }
3229 | forall TRAIT identifier_or_type_name '{' '}' // alternate
3230 { $$ = DeclarationNode::newTrait( $3, $1, nullptr ); }
3231 | TRAIT identifier_or_type_name '(' type_parameter_list ')' '{' trait_declaration_list '}'
3232 {
3233 SemanticWarning( yylloc, Warning::DeprecTraitSyntax );
3234 $$ = DeclarationNode::newTrait( $2, $4, $7 );
3235 }
3236 | forall TRAIT identifier_or_type_name '{' trait_declaration_list '}' // alternate
3237 { $$ = DeclarationNode::newTrait( $3, $1, $5 ); }
3238 ;
3239
3240trait_declaration_list: // CFA
3241 trait_declaration
3242 | trait_declaration_list trait_declaration
3243 { $$ = $1->set_last( $2 ); }
3244 ;
3245
3246trait_declaration: // CFA
3247 cfa_trait_declaring_list ';'
3248 | trait_declaring_list ';'
3249 ;
3250
3251cfa_trait_declaring_list: // CFA
3252 cfa_variable_specifier
3253 | cfa_function_specifier
3254 | cfa_trait_declaring_list ',' identifier_or_type_name
3255 { $$ = $1->set_last( $1->cloneType( $3 ) ); }
3256 ;
3257
3258trait_declaring_list: // CFA
3259 // Cannot declare an aggregate or enumeration in a trait.
3260 type_specifier_nobody declarator
3261 { $$ = $2->addType( $1 ); }
3262 | trait_declaring_list ',' declarator
3263 { $$ = $1->set_last( $1->cloneBaseType( $3 ) ); }
3264 | error
3265 { SemanticError( yylloc, "Possible cause is declaring an aggregate or enumeration type in a trait." ); $$ = nullptr; }
3266 ;
3267
3268// **************************** EXTERNAL DEFINITIONS *****************************
3269
3270translation_unit:
3271 // empty, input file
3272 | external_definition_list
3273 { parseTree = parseTree ? parseTree->set_last( $1 ) : $1; }
3274 ;
3275
3276external_definition_list:
3277 push external_definition pop
3278 { $$ = $2; }
3279 | external_definition_list push external_definition pop
3280 { $$ = $1 ? $1->set_last( $3 ) : $3; }
3281 ;
3282
3283external_definition_list_opt:
3284 // empty
3285 { $$ = nullptr; }
3286 | external_definition_list
3287 ;
3288
3289up:
3290 { typedefTable.up( forall ); forall = false; }
3291 ;
3292
3293down:
3294 { typedefTable.down(); }
3295 ;
3296
3297external_definition:
3298 DIRECTIVE
3299 { $$ = DeclarationNode::newDirectiveStmt( new StatementNode( build_directive( yylloc, $1 ) ) ); }
3300 | declaration
3301 {
3302 // Variable declarations of anonymous types requires creating a unique type-name across multiple translation
3303 // unit, which is a dubious task, especially because C uses name rather than structural typing; hence it is
3304 // disallowed at the moment.
3305 if ( $1->linkage == ast::Linkage::Cforall && ! $1->storageClasses.is_static &&
3306 $1->type && $1->type->kind == TypeData::AggregateInst ) {
3307 if ( $1->type->aggInst.aggregate->aggregate.anon ) {
3308 SemanticError( yylloc, "extern anonymous aggregate is currently unimplemented." ); $$ = nullptr;
3309 }
3310 }
3311 }
3312 | IDENTIFIER IDENTIFIER
3313 { IdentifierBeforeIdentifier( *$1.str, *$2.str, " declaration" ); $$ = nullptr; }
3314 | IDENTIFIER type_qualifier // invalid syntax rule
3315 { IdentifierBeforeType( *$1.str, "type qualifier" ); $$ = nullptr; }
3316 | IDENTIFIER storage_class // invalid syntax rule
3317 { IdentifierBeforeType( *$1.str, "storage class" ); $$ = nullptr; }
3318 | IDENTIFIER basic_type_name // invalid syntax rule
3319 { IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3320 | IDENTIFIER TYPEDEFname // invalid syntax rule
3321 { IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3322 | IDENTIFIER TYPEGENname // invalid syntax rule
3323 { IdentifierBeforeType( *$1.str, "type" ); $$ = nullptr; }
3324 | external_function_definition
3325 | EXTENSION external_definition // GCC, multiple __extension__ allowed, meaning unknown
3326 {
3327 distExt( $2 ); // mark all fields in list
3328 $$ = $2;
3329 }
3330 | ASM '(' string_literal ')' ';' // GCC, global assembler statement
3331 { $$ = DeclarationNode::newAsmStmt( new StatementNode( build_asm( yylloc, false, $3, nullptr ) ) ); }
3332 | EXTERN STRINGliteral
3333 {
3334 linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
3335 linkage = ast::Linkage::update( yylloc, linkage, $2 );
3336 }
3337 up external_definition down
3338 {
3339 linkage = linkageStack.top();
3340 linkageStack.pop();
3341 $$ = $5;
3342 }
3343 | EXTERN STRINGliteral // C++-style linkage specifier
3344 {
3345 linkageStack.push( linkage ); // handle nested extern "C"/"Cforall"
3346 linkage = ast::Linkage::update( yylloc, linkage, $2 );
3347 }
3348 '{' up external_definition_list_opt down '}'
3349 {
3350 linkage = linkageStack.top();
3351 linkageStack.pop();
3352 $$ = $6;
3353 }
3354 // global distribution
3355 | type_qualifier_list
3356 {
3357 if ( $1->type->qualifiers.any() ) {
3358 SemanticError( yylloc, "illegal syntax, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3359 }
3360 if ( $1->type->forall ) forall = true; // remember generic type
3361 }
3362 '{' up external_definition_list_opt down '}' // CFA, namespace
3363 {
3364 distQual( $5, $1 );
3365 forall = false;
3366 $$ = $5;
3367 }
3368 | declaration_qualifier_list
3369 {
3370 if ( $1->type && $1->type->qualifiers.any() ) {
3371 SemanticError( yylloc, "illegal syntax, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3372 }
3373 if ( $1->type && $1->type->forall ) forall = true; // remember generic type
3374 }
3375 '{' up external_definition_list_opt down '}' // CFA, namespace
3376 {
3377 distQual( $5, $1 );
3378 forall = false;
3379 $$ = $5;
3380 }
3381 | declaration_qualifier_list type_qualifier_list
3382 {
3383 if ( ($1->type && $1->type->qualifiers.any()) || ($2->type && $2->type->qualifiers.any()) ) {
3384 SemanticError( yylloc, "illegal syntax, CV qualifiers cannot be distributed; only storage-class and forall qualifiers." );
3385 }
3386 if ( ($1->type && $1->type->forall) || ($2->type && $2->type->forall) ) forall = true; // remember generic type
3387 }
3388 '{' up external_definition_list_opt down '}' // CFA, namespace
3389 {
3390 distQual( $6, $1->addQualifiers( $2 ) );
3391 forall = false;
3392 $$ = $6;
3393 }
3394 | ';' // empty declaration
3395 { $$ = nullptr; }
3396 ;
3397
3398external_function_definition:
3399 function_definition
3400 // These rules are a concession to the "implicit int" type_specifier because there is a significant amount of
3401 // legacy code with global functions missing the type-specifier for the return type, and assuming "int".
3402 // Parsing is possible because function_definition does not appear in the context of an expression (nested
3403 // functions preclude this concession, i.e., all nested function must have a return type). A function prototype
3404 // declaration must still have a type_specifier. OBSOLESCENT (see 1)
3405 | function_declarator compound_statement
3406 { $$ = $1->addFunctionBody( $2 ); }
3407 | KR_function_declarator KR_parameter_list_opt compound_statement
3408 { $$ = $1->addOldDeclList( $2 )->addFunctionBody( $3 ); }
3409 ;
3410
3411with_clause_opt:
3412 // empty
3413 { $$ = nullptr; forall = false; }
3414 | WITH '(' type_list ')' attribute_list_opt // support scoped enumeration
3415 {
3416 $$ = $3; forall = false;
3417 if ( $5 ) {
3418 SemanticError( yylloc, "illegal syntax, attributes cannot be associated with function body. Move attribute(s) before \"with\" clause." );
3419 $$ = nullptr;
3420 } // if
3421 }
3422 ;
3423
3424function_definition:
3425 cfa_function_declaration with_clause_opt compound_statement // CFA
3426 {
3427 // Add the function body to the last identifier in the function definition list, i.e., foo3:
3428 // [const double] foo1(), foo2( int ), foo3( double ) { return 3.0; }
3429 $1->get_last()->addFunctionBody( $3, $2 );
3430 $$ = $1;
3431 }
3432 | declaration_specifier function_declarator with_clause_opt compound_statement
3433 {
3434 rebindForall( $1, $2 );
3435 $$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
3436 }
3437 | declaration_specifier function_type_redeclarator with_clause_opt compound_statement
3438 {
3439 rebindForall( $1, $2 );
3440 $$ = $2->addFunctionBody( $4, $3 )->addType( $1 );
3441 }
3442 // handles default int return type, OBSOLESCENT (see 1)
3443 | type_qualifier_list function_declarator with_clause_opt compound_statement
3444 { $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
3445 // handles default int return type, OBSOLESCENT (see 1)
3446 | declaration_qualifier_list function_declarator with_clause_opt compound_statement
3447 { $$ = $2->addFunctionBody( $4, $3 )->addQualifiers( $1 ); }
3448 // handles default int return type, OBSOLESCENT (see 1)
3449 | declaration_qualifier_list type_qualifier_list function_declarator with_clause_opt compound_statement
3450 { $$ = $3->addFunctionBody( $5, $4 )->addQualifiers( $2 )->addQualifiers( $1 ); }
3451
3452 // Old-style K&R function definition, OBSOLESCENT (see 4)
3453 | declaration_specifier KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3454 {
3455 rebindForall( $1, $2 );
3456 $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addType( $1 );
3457 }
3458 // handles default int return type, OBSOLESCENT (see 1)
3459 | type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3460 { $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
3461 // handles default int return type, OBSOLESCENT (see 1)
3462 | declaration_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3463 { $$ = $2->addOldDeclList( $3 )->addFunctionBody( $5, $4 )->addQualifiers( $1 ); }
3464 // handles default int return type, OBSOLESCENT (see 1)
3465 | declaration_qualifier_list type_qualifier_list KR_function_declarator KR_parameter_list_opt with_clause_opt compound_statement
3466 { $$ = $3->addOldDeclList( $4 )->addFunctionBody( $6, $5 )->addQualifiers( $2 )->addQualifiers( $1 ); }
3467 ;
3468
3469declarator:
3470 variable_declarator
3471 | variable_type_redeclarator
3472 | function_declarator
3473 | function_type_redeclarator
3474 ;
3475
3476subrange:
3477 constant_expression '~' constant_expression // CFA, integer subrange
3478 { $$ = new ExpressionNode( new ast::RangeExpr( yylloc, maybeMoveBuild( $1 ), maybeMoveBuild( $3 ) ) ); }
3479 ;
3480
3481// **************************** ASM *****************************
3482
3483asm_name_opt: // GCC
3484 // empty
3485 { $$ = nullptr; }
3486 | ASM '(' string_literal ')' attribute_list_opt
3487 {
3488 DeclarationNode * name = new DeclarationNode();
3489 name->asmName = maybeMoveBuild( $3 );
3490 $$ = name->addQualifiers( $5 );
3491 }
3492 ;
3493
3494// **************************** ATTRIBUTE *****************************
3495
3496attribute_list_opt: // GCC
3497 // empty
3498 { $$ = nullptr; }
3499 | attribute_list
3500 ;
3501
3502attribute_list: // GCC
3503 attribute
3504 | attribute_list attribute
3505 { $$ = $2->addQualifiers( $1 ); }
3506 ;
3507
3508attribute: // GCC
3509 ATTRIBUTE '(' '(' attribute_name_list ')' ')'
3510 { $$ = $4; }
3511 | ATTRIBUTE '(' attribute_name_list ')' // CFA
3512 { $$ = $3; }
3513 | ATTR '(' attribute_name_list ')' // CFA
3514 { $$ = $3; }
3515 | C23_ATTRIBUTE
3516 { $$ = DeclarationNode::newAttribute( $1 ); }
3517 ;
3518
3519attribute_name_list: // GCC
3520 attribute_name
3521 | attribute_name_list ',' attribute_name
3522 { $$ = $3->addQualifiers( $1 ); }
3523 ;
3524
3525attribute_name: // GCC
3526 // empty
3527 { $$ = nullptr; }
3528 | attr_name
3529 { $$ = DeclarationNode::newAttribute( $1 ); }
3530 | attr_name '(' argument_expression_list_opt ')'
3531 { $$ = DeclarationNode::newAttribute( $1, $3 ); }
3532 ;
3533
3534attr_name: // GCC
3535 identifier_or_type_name
3536 | FALLTHROUGH
3537 { $$ = Token{ new string( "fallthrough" ), { nullptr, -1 } }; }
3538 | CONST
3539 { $$ = Token{ new string( "__const__" ), { nullptr, -1 } }; }
3540 ;
3541
3542// ============================================================================
3543// The following sections are a series of grammar patterns used to parse declarators. Multiple patterns are necessary
3544// because the type of an identifier in wrapped around the identifier in the same form as its usage in an expression, as
3545// in:
3546//
3547// int (*f())[10] { ... };
3548// ... (*f())[3] += 1; // definition mimics usage
3549//
3550// Because these patterns are highly recursive, changes at a lower level in the recursion require copying some or all of
3551// the pattern. Each of these patterns has some subtle variation to ensure correct syntax in a particular context.
3552// ============================================================================
3553
3554// ----------------------------------------------------------------------------
3555// The set of valid declarators before a compound statement for defining a function is less than the set of declarators
3556// to define a variable or function prototype, e.g.:
3557//
3558// valid declaration invalid definition
3559// ----------------- ------------------
3560// int f; int f {}
3561// int *f; int *f {}
3562// int f[10]; int f[10] {}
3563// int (*f)(int); int (*f)(int) {}
3564//
3565// To preclude this syntactic anomaly requires separating the grammar rules for variable and function declarators, hence
3566// variable_declarator and function_declarator.
3567// ----------------------------------------------------------------------------
3568
3569// This pattern parses a declaration of a variable that is not redefining a typedef name. The pattern precludes
3570// declaring an array of functions versus a pointer to an array of functions.
3571
3572paren_identifier:
3573 identifier_at
3574 { $$ = DeclarationNode::newName( $1 ); }
3575 | '?' identifier
3576 // { SemanticError( yylloc, "keyword parameter is currently unimplemented." ); $$ = nullptr; }
3577 { $$ = DeclarationNode::newName( $2 ); }
3578 | '(' paren_identifier ')' // redundant parenthesis
3579 { $$ = $2; }
3580 ;
3581
3582variable_declarator:
3583 paren_identifier attribute_list_opt
3584 { $$ = $1->addQualifiers( $2 ); }
3585 | variable_ptr
3586 | variable_array attribute_list_opt
3587 { $$ = $1->addQualifiers( $2 ); }
3588 | variable_function attribute_list_opt
3589 { $$ = $1->addQualifiers( $2 ); }
3590 ;
3591
3592variable_ptr:
3593 ptrref_operator variable_declarator
3594 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3595 | ptrref_operator type_qualifier_list variable_declarator
3596 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3597 | '(' variable_ptr ')' attribute_list_opt // redundant parenthesis
3598 { $$ = $2->addQualifiers( $4 ); }
3599 | '(' attribute_list variable_ptr ')' attribute_list_opt // redundant parenthesis
3600 { $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3601 ;
3602
3603variable_array:
3604 paren_identifier array_dimension
3605 { $$ = $1->addArray( $2 ); }
3606 | '(' variable_ptr ')' array_dimension
3607 { $$ = $2->addArray( $4 ); }
3608 | '(' attribute_list variable_ptr ')' array_dimension
3609 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3610 | '(' variable_array ')' multi_array_dimension // redundant parenthesis
3611 { $$ = $2->addArray( $4 ); }
3612 | '(' attribute_list variable_array ')' multi_array_dimension // redundant parenthesis
3613 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3614 | '(' variable_array ')' // redundant parenthesis
3615 { $$ = $2; }
3616 | '(' attribute_list variable_array ')' // redundant parenthesis
3617 { $$ = $3->addQualifiers( $2 ); }
3618 ;
3619
3620variable_function:
3621 '(' variable_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3622 { $$ = $2->addParamList( $5 ); }
3623 | '(' attribute_list variable_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3624 { $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3625 | '(' variable_function ')' // redundant parenthesis
3626 { $$ = $2; }
3627 | '(' attribute_list variable_function ')' // redundant parenthesis
3628 { $$ = $3->addQualifiers( $2 ); }
3629 ;
3630
3631// This pattern parses a function declarator that is not redefining a typedef name. For non-nested functions, there is
3632// no context where a function definition can redefine a typedef name, i.e., the typedef and function name cannot exist
3633// is the same scope. The pattern precludes returning arrays and functions versus pointers to arrays and functions.
3634
3635function_declarator:
3636 function_no_ptr attribute_list_opt
3637 { $$ = $1->addQualifiers( $2 ); }
3638 | function_ptr
3639 | function_array attribute_list_opt
3640 { $$ = $1->addQualifiers( $2 ); }
3641 ;
3642
3643function_no_ptr:
3644 paren_identifier '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3645 { $$ = $1->addParamList( $3 ); }
3646 | '(' function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3647 { $$ = $2->addParamList( $5 ); }
3648 | '(' attribute_list function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3649 { $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3650 | '(' function_no_ptr ')' // redundant parenthesis
3651 { $$ = $2; }
3652 | '(' attribute_list function_no_ptr ')' // redundant parenthesis
3653 { $$ = $3->addQualifiers( $2 ); }
3654 ;
3655
3656function_ptr:
3657 ptrref_operator function_declarator
3658 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3659 | ptrref_operator type_qualifier_list function_declarator
3660 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3661 | '(' function_ptr ')' attribute_list_opt
3662 { $$ = $2->addQualifiers( $4 ); }
3663 | '(' attribute_list function_ptr ')' attribute_list_opt
3664 { $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3665 ;
3666
3667function_array:
3668 '(' function_ptr ')' array_dimension
3669 { $$ = $2->addArray( $4 ); }
3670 | '(' attribute_list function_ptr ')' array_dimension
3671 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3672 | '(' function_array ')' multi_array_dimension // redundant parenthesis
3673 { $$ = $2->addArray( $4 ); }
3674 | '(' attribute_list function_array ')' multi_array_dimension // redundant parenthesis
3675 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3676 | '(' function_array ')' // redundant parenthesis
3677 { $$ = $2; }
3678 | '(' attribute_list function_array ')' // redundant parenthesis
3679 { $$ = $3->addQualifiers( $2 ); }
3680 ;
3681
3682// This pattern parses an old-style K&R function declarator (OBSOLESCENT, see 4)
3683//
3684// f( a, b, c ) int a, *b, c[]; {}
3685//
3686// that is not redefining a typedef name (see function_declarator for additional comments). The pattern precludes
3687// returning arrays and functions versus pointers to arrays and functions.
3688
3689KR_function_declarator:
3690 KR_function_no_ptr
3691 | KR_function_ptr
3692 | KR_function_array
3693 ;
3694
3695KR_function_no_ptr:
3696 paren_identifier '(' identifier_list ')' // function_declarator handles empty parameter
3697 { $$ = $1->addIdList( $3 ); }
3698 | '(' KR_function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3699 { $$ = $2->addParamList( $5 ); }
3700 | '(' attribute_list KR_function_ptr ')' '(' parameter_list_ellipsis_opt ')'
3701 { $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3702 | '(' KR_function_no_ptr ')' // redundant parenthesis
3703 { $$ = $2; }
3704 | '(' attribute_list KR_function_no_ptr ')' // redundant parenthesis
3705 { $$ = $3->addQualifiers( $2 ); }
3706 ;
3707
3708KR_function_ptr:
3709 ptrref_operator KR_function_declarator
3710 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3711 | ptrref_operator type_qualifier_list KR_function_declarator
3712 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3713 | '(' KR_function_ptr ')'
3714 { $$ = $2; }
3715 | '(' attribute_list KR_function_ptr ')'
3716 { $$ = $3->addQualifiers( $2 ); }
3717 ;
3718
3719KR_function_array:
3720 '(' KR_function_ptr ')' array_dimension
3721 { $$ = $2->addArray( $4 ); }
3722 | '(' attribute_list KR_function_ptr ')' array_dimension
3723 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3724 | '(' KR_function_array ')' multi_array_dimension // redundant parenthesis
3725 { $$ = $2->addArray( $4 ); }
3726 | '(' attribute_list KR_function_array ')' multi_array_dimension // redundant parenthesis
3727 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3728 | '(' KR_function_array ')' // redundant parenthesis
3729 { $$ = $2; }
3730 | '(' attribute_list KR_function_array ')' // redundant parenthesis
3731 { $$ = $3->addQualifiers( $2 ); }
3732 ;
3733
3734// This pattern parses a declaration for a variable that redefines a type name, e.g.:
3735//
3736// typedef int foo;
3737// {
3738// int foo; // redefine typedef name in new scope
3739// }
3740
3741paren_type:
3742 typedef_name
3743 {
3744 // hide type name in enclosing scope by variable name
3745 typedefTable.addToEnclosingScope( *$1->name, IDENTIFIER, "paren_type" );
3746 }
3747 | '(' paren_type ')'
3748 { $$ = $2; }
3749 ;
3750
3751variable_type_redeclarator:
3752 paren_type attribute_list_opt
3753 { $$ = $1->addQualifiers( $2 ); }
3754 | variable_type_ptr
3755 | variable_type_array attribute_list_opt
3756 { $$ = $1->addQualifiers( $2 ); }
3757 | variable_type_function attribute_list_opt
3758 { $$ = $1->addQualifiers( $2 ); }
3759 ;
3760
3761variable_type_ptr:
3762 ptrref_operator variable_type_redeclarator
3763 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3764 | ptrref_operator type_qualifier_list variable_type_redeclarator
3765 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3766 | '(' variable_type_ptr ')' attribute_list_opt // redundant parenthesis
3767 { $$ = $2->addQualifiers( $4 ); }
3768 | '(' attribute_list variable_type_ptr ')' attribute_list_opt // redundant parenthesis
3769 { $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3770 ;
3771
3772variable_type_array:
3773 paren_type array_dimension
3774 { $$ = $1->addArray( $2 ); }
3775 | '(' variable_type_ptr ')' array_dimension
3776 { $$ = $2->addArray( $4 ); }
3777 | '(' attribute_list variable_type_ptr ')' array_dimension
3778 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3779 | '(' variable_type_array ')' multi_array_dimension // redundant parenthesis
3780 { $$ = $2->addArray( $4 ); }
3781 | '(' attribute_list variable_type_array ')' multi_array_dimension // redundant parenthesis
3782 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3783 | '(' variable_type_array ')' // redundant parenthesis
3784 { $$ = $2; }
3785 | '(' attribute_list variable_type_array ')' // redundant parenthesis
3786 { $$ = $3->addQualifiers( $2 ); }
3787 ;
3788
3789variable_type_function:
3790 '(' variable_type_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3791 { $$ = $2->addParamList( $5 ); }
3792 | '(' attribute_list variable_type_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3793 { $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3794 | '(' variable_type_function ')' // redundant parenthesis
3795 { $$ = $2; }
3796 | '(' attribute_list variable_type_function ')' // redundant parenthesis
3797 { $$ = $3->addQualifiers( $2 ); }
3798 ;
3799
3800// This pattern parses a declaration for a function prototype that redefines a type name. It precludes declaring an
3801// array of functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to
3802// arrays and functions.
3803
3804function_type_redeclarator:
3805 function_type_no_ptr attribute_list_opt
3806 { $$ = $1->addQualifiers( $2 ); }
3807 | function_type_ptr
3808 | function_type_array attribute_list_opt
3809 { $$ = $1->addQualifiers( $2 ); }
3810 ;
3811
3812function_type_no_ptr:
3813 paren_type '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3814 { $$ = $1->addParamList( $3 ); }
3815 | '(' function_type_ptr ')' '(' parameter_list_ellipsis_opt ')'
3816 { $$ = $2->addParamList( $5 ); }
3817 | '(' attribute_list function_type_ptr ')' '(' parameter_list_ellipsis_opt ')'
3818 { $$ = $3->addQualifiers( $2 )->addParamList( $6 ); }
3819 | '(' function_type_no_ptr ')' // redundant parenthesis
3820 { $$ = $2; }
3821 | '(' attribute_list function_type_no_ptr ')' // redundant parenthesis
3822 { $$ = $3->addQualifiers( $2 ); }
3823 ;
3824
3825function_type_ptr:
3826 ptrref_operator function_type_redeclarator
3827 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3828 | ptrref_operator type_qualifier_list function_type_redeclarator
3829 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3830 | '(' function_type_ptr ')' attribute_list_opt
3831 { $$ = $2->addQualifiers( $4 ); }
3832 | '(' attribute_list function_type_ptr ')' attribute_list_opt
3833 { $$ = $3->addQualifiers( $2 )->addQualifiers( $5 ); }
3834 ;
3835
3836function_type_array:
3837 '(' function_type_ptr ')' array_dimension
3838 { $$ = $2->addArray( $4 ); }
3839 | '(' attribute_list function_type_ptr ')' array_dimension
3840 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3841 | '(' function_type_array ')' multi_array_dimension // redundant parenthesis
3842 { $$ = $2->addArray( $4 ); }
3843 | '(' attribute_list function_type_array ')' multi_array_dimension // redundant parenthesis
3844 { $$ = $3->addQualifiers( $2 )->addArray( $5 ); }
3845 | '(' function_type_array ')' // redundant parenthesis
3846 { $$ = $2; }
3847 | '(' attribute_list function_type_array ')' // redundant parenthesis
3848 { $$ = $3->addQualifiers( $2 ); }
3849 ;
3850
3851// This pattern parses a declaration for a parameter variable of a function prototype or actual that is not redefining a
3852// typedef name and allows the C99 array options, which can only appear in a parameter list. The pattern precludes
3853// declaring an array of functions versus a pointer to an array of functions, and returning arrays and functions versus
3854// pointers to arrays and functions.
3855
3856identifier_parameter_declarator:
3857 paren_identifier attribute_list_opt
3858 { $$ = $1->addQualifiers( $2 ); }
3859 | '&' MUTEX paren_identifier attribute_list_opt
3860 { $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newFromTypeData( build_type_qualifier( ast::CV::Mutex ) ),
3861 OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3862 | identifier_parameter_ptr
3863 | identifier_parameter_array attribute_list_opt
3864 { $$ = $1->addQualifiers( $2 ); }
3865 | identifier_parameter_function attribute_list_opt
3866 { $$ = $1->addQualifiers( $2 ); }
3867 ;
3868
3869identifier_parameter_ptr:
3870 ptrref_operator identifier_parameter_declarator
3871 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3872 | ptrref_operator type_qualifier_list identifier_parameter_declarator
3873 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3874 | '(' identifier_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3875 { $$ = $2->addQualifiers( $4 ); }
3876 ;
3877
3878identifier_parameter_array:
3879 paren_identifier array_parameter_dimension
3880 { $$ = $1->addArray( $2 ); }
3881 | '(' identifier_parameter_ptr ')' array_dimension
3882 { $$ = $2->addArray( $4 ); }
3883 | '(' identifier_parameter_array ')' multi_array_dimension // redundant parenthesis
3884 { $$ = $2->addArray( $4 ); }
3885 | '(' identifier_parameter_array ')' // redundant parenthesis
3886 { $$ = $2; }
3887 ;
3888
3889identifier_parameter_function:
3890 paren_identifier '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3891 { $$ = $1->addParamList( $3 ); }
3892 | '(' identifier_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3893 { $$ = $2->addParamList( $5 ); }
3894 | '(' identifier_parameter_function ')' // redundant parenthesis
3895 { $$ = $2; }
3896 ;
3897
3898// This pattern parses a declaration for a parameter variable or function prototype that is redefining a typedef name,
3899// e.g.:
3900//
3901// typedef int foo;
3902// forall( otype T ) struct foo;
3903// int f( int foo ); // redefine typedef name in new scope
3904//
3905// and allows the C99 array options, which can only appear in a parameter list.
3906
3907type_parameter_redeclarator:
3908 typedef_name attribute_list_opt
3909 { $$ = $1->addQualifiers( $2 ); }
3910 | '&' MUTEX typedef_name attribute_list_opt
3911 { $$ = $3->addPointer( DeclarationNode::newPointer( DeclarationNode::newFromTypeData( build_type_qualifier( ast::CV::Mutex ) ),
3912 OperKinds::AddressOf ) )->addQualifiers( $4 ); }
3913 | type_parameter_ptr
3914 | type_parameter_array attribute_list_opt
3915 { $$ = $1->addQualifiers( $2 ); }
3916 | type_parameter_function attribute_list_opt
3917 { $$ = $1->addQualifiers( $2 ); }
3918 ;
3919
3920typedef_name:
3921 TYPEDEFname
3922 { $$ = DeclarationNode::newName( $1 ); }
3923 | TYPEGENname
3924 { $$ = DeclarationNode::newName( $1 ); }
3925 ;
3926
3927type_parameter_ptr:
3928 ptrref_operator type_parameter_redeclarator
3929 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3930 | ptrref_operator type_qualifier_list type_parameter_redeclarator
3931 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3932 | '(' type_parameter_ptr ')' attribute_list_opt // redundant parenthesis
3933 { $$ = $2->addQualifiers( $4 ); }
3934 ;
3935
3936type_parameter_array:
3937 typedef_name array_parameter_dimension
3938 { $$ = $1->addArray( $2 ); }
3939 | '(' type_parameter_ptr ')' array_parameter_dimension
3940 { $$ = $2->addArray( $4 ); }
3941 ;
3942
3943type_parameter_function:
3944 typedef_name '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3945 { $$ = $1->addParamList( $3 ); }
3946 | '(' type_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3947 { $$ = $2->addParamList( $5 ); }
3948 ;
3949
3950// This pattern parses a declaration of an abstract variable or function prototype, i.e., there is no identifier to
3951// which the type applies, e.g.:
3952//
3953// sizeof( int );
3954// sizeof( int * );
3955// sizeof( int [10] );
3956// sizeof( int (*)() );
3957// sizeof( int () );
3958//
3959// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
3960// and functions versus pointers to arrays and functions.
3961
3962abstract_declarator:
3963 abstract_ptr
3964 | abstract_array attribute_list_opt
3965 { $$ = $1->addQualifiers( $2 ); }
3966 | abstract_function attribute_list_opt
3967 { $$ = $1->addQualifiers( $2 ); }
3968 ;
3969
3970abstract_ptr:
3971 ptrref_operator
3972 { $$ = DeclarationNode::newPointer( nullptr, $1 ); }
3973 | ptrref_operator type_qualifier_list
3974 { $$ = DeclarationNode::newPointer( $2, $1 ); }
3975 | ptrref_operator abstract_declarator
3976 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
3977 | ptrref_operator type_qualifier_list abstract_declarator
3978 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
3979 | '(' abstract_ptr ')' attribute_list_opt
3980 { $$ = $2->addQualifiers( $4 ); }
3981 ;
3982
3983abstract_array:
3984 array_dimension
3985 | '(' abstract_ptr ')' array_dimension
3986 { $$ = $2->addArray( $4 ); }
3987 | '(' abstract_array ')' multi_array_dimension // redundant parenthesis
3988 { $$ = $2->addArray( $4 ); }
3989 | '(' abstract_array ')' // redundant parenthesis
3990 { $$ = $2; }
3991 ;
3992
3993abstract_function:
3994 '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3995 { $$ = DeclarationNode::newFunction( nullptr, nullptr, $2, nullptr ); }
3996 | '(' abstract_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
3997 { $$ = $2->addParamList( $5 ); }
3998 | '(' abstract_function ')' // redundant parenthesis
3999 { $$ = $2; }
4000 ;
4001
4002array_dimension:
4003 // Only the first dimension can be empty.
4004 '[' ']'
4005 { $$ = DeclarationNode::newArray( nullptr, nullptr, false ); }
4006 | '[' ']' multi_array_dimension
4007 { $$ = DeclarationNode::newArray( nullptr, nullptr, false )->addArray( $3 ); }
4008 // Cannot use constant_expression because of tuples => semantic check
4009 | '[' assignment_expression ',' comma_expression ']' // CFA
4010 { $$ = DeclarationNode::newArray( $2, nullptr, false )->addArray( DeclarationNode::newArray( $4, nullptr, false ) ); }
4011 // { SemanticError( yylloc, "New array dimension is currently unimplemented." ); $$ = nullptr; }
4012
4013 // If needed, the following parses and does not use comma_expression, so the array structure can be built.
4014 // | '[' push assignment_expression pop ',' push array_dimension_list pop ']' // CFA
4015
4016 | '[' array_type_list ']' // CFA
4017 { $$ = DeclarationNode::newArray( $2, nullptr, false ); }
4018 | multi_array_dimension
4019 ;
4020
4021// array_dimension_list:
4022// assignment_expression
4023// | array_dimension_list ',' assignment_expression
4024// ;
4025
4026array_type_list:
4027 basic_type_name
4028 { $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
4029 | type_name
4030 { $$ = new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $1 ) ) ); }
4031 | assignment_expression upupeq assignment_expression
4032 | array_type_list ',' basic_type_name
4033 { $$ = $1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) ); }
4034 | array_type_list ',' type_name
4035 { $$ = $1->set_last( new ExpressionNode( new ast::TypeExpr( yylloc, maybeMoveBuildType( $3 ) ) ) ); }
4036 | array_type_list ',' assignment_expression upupeq assignment_expression
4037 ;
4038
4039upupeq:
4040 '~'
4041 { $$ = OperKinds::LThan; }
4042 | ErangeUpEq
4043 { $$ = OperKinds::LEThan; }
4044 ;
4045
4046multi_array_dimension:
4047 '[' assignment_expression ']'
4048 { $$ = DeclarationNode::newArray( $2, nullptr, false ); }
4049 | '[' '*' ']' // C99
4050 { $$ = DeclarationNode::newVarArray( 0 ); }
4051 | multi_array_dimension '[' assignment_expression ']'
4052 { $$ = $1->addArray( DeclarationNode::newArray( $3, nullptr, false ) ); }
4053 | multi_array_dimension '[' '*' ']' // C99
4054 { $$ = $1->addArray( DeclarationNode::newVarArray( 0 ) ); }
4055 ;
4056
4057// This pattern parses a declaration of a parameter abstract variable or function prototype, i.e., there is no
4058// identifier to which the type applies, e.g.:
4059//
4060// int f( int ); // not handled here
4061// int f( int * ); // abstract function-prototype parameter; no parameter name specified
4062// int f( int (*)() ); // abstract function-prototype parameter; no parameter name specified
4063// int f( int (int) ); // abstract function-prototype parameter; no parameter name specified
4064//
4065// The pattern precludes declaring an array of functions versus a pointer to an array of functions, and returning arrays
4066// and functions versus pointers to arrays and functions. In addition, the pattern handles the special meaning of
4067// parenthesis around a typedef name:
4068//
4069// ISO/IEC 9899:1999 Section 6.7.5.3(11) : "In a parameter declaration, a single typedef name in
4070// parentheses is taken to be an abstract declarator that specifies a function with a single parameter,
4071// not as redundant parentheses around the identifier."
4072//
4073// For example:
4074//
4075// typedef float T;
4076// int f( int ( T [5] ) ); // see abstract_parameter_declarator
4077// int g( int ( T ( int ) ) ); // see abstract_parameter_declarator
4078// int f( int f1( T a[5] ) ); // see identifier_parameter_declarator
4079// int g( int g1( T g2( int p ) ) ); // see identifier_parameter_declarator
4080//
4081// In essence, a '(' immediately to the left of typedef name, T, is interpreted as starting a parameter type list, and
4082// not as redundant parentheses around a redeclaration of T. Finally, the pattern also precludes declaring an array of
4083// functions versus a pointer to an array of functions, and returning arrays and functions versus pointers to arrays and
4084// functions.
4085
4086abstract_parameter_declarator_opt:
4087 // empty
4088 { $$ = nullptr; }
4089 | abstract_parameter_declarator
4090 ;
4091
4092abstract_parameter_declarator:
4093 abstract_parameter_ptr
4094 | '&' MUTEX attribute_list_opt
4095 { $$ = DeclarationNode::newPointer( DeclarationNode::newFromTypeData( build_type_qualifier( ast::CV::Mutex ) ),
4096 OperKinds::AddressOf )->addQualifiers( $3 ); }
4097 | abstract_parameter_array attribute_list_opt
4098 { $$ = $1->addQualifiers( $2 ); }
4099 | abstract_parameter_function attribute_list_opt
4100 { $$ = $1->addQualifiers( $2 ); }
4101 ;
4102
4103abstract_parameter_ptr:
4104 ptrref_operator
4105 { $$ = DeclarationNode::newPointer( nullptr, $1 ); }
4106 | ptrref_operator type_qualifier_list
4107 { $$ = DeclarationNode::newPointer( $2, $1 ); }
4108 | ptrref_operator abstract_parameter_declarator
4109 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4110 | ptrref_operator type_qualifier_list abstract_parameter_declarator
4111 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
4112 | '(' abstract_parameter_ptr ')' attribute_list_opt // redundant parenthesis
4113 { $$ = $2->addQualifiers( $4 ); }
4114 ;
4115
4116abstract_parameter_array:
4117 array_parameter_dimension
4118 | '(' abstract_parameter_ptr ')' array_parameter_dimension
4119 { $$ = $2->addArray( $4 ); }
4120 | '(' abstract_parameter_array ')' multi_array_dimension // redundant parenthesis
4121 { $$ = $2->addArray( $4 ); }
4122 | '(' abstract_parameter_array ')' // redundant parenthesis
4123 { $$ = $2; }
4124 ;
4125
4126abstract_parameter_function:
4127 '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4128 { $$ = DeclarationNode::newFunction( nullptr, nullptr, $2, nullptr ); }
4129 | '(' abstract_parameter_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4130 { $$ = $2->addParamList( $5 ); }
4131 | '(' abstract_parameter_function ')' // redundant parenthesis
4132 { $$ = $2; }
4133 ;
4134
4135array_parameter_dimension:
4136 // Only the first dimension can be empty or have qualifiers.
4137 array_parameter_1st_dimension
4138 | array_parameter_1st_dimension multi_array_dimension
4139 { $$ = $1->addArray( $2 ); }
4140 | multi_array_dimension
4141 ;
4142
4143// The declaration of an array parameter has additional syntax over arrays in normal variable declarations:
4144//
4145// ISO/IEC 9899:1999 Section 6.7.5.2(1) : "The optional type qualifiers and the keyword static shall appear only in
4146// a declaration of a function parameter with an array type, and then only in the outermost array type derivation."
4147
4148array_parameter_1st_dimension:
4149 '[' ']'
4150 { $$ = DeclarationNode::newArray( nullptr, nullptr, false ); }
4151 // multi_array_dimension handles the '[' '*' ']' case
4152 | '[' push type_qualifier_list '*' pop ']' // remaining C99
4153 { $$ = DeclarationNode::newVarArray( $3 ); }
4154 | '[' push type_qualifier_list pop ']'
4155 { $$ = DeclarationNode::newArray( nullptr, $3, false ); }
4156 // multi_array_dimension handles the '[' assignment_expression ']' case
4157 | '[' push type_qualifier_list assignment_expression pop ']'
4158 { $$ = DeclarationNode::newArray( $4, $3, false ); }
4159 | '[' push STATIC type_qualifier_list_opt assignment_expression pop ']'
4160 { $$ = DeclarationNode::newArray( $5, $4, true ); }
4161 | '[' push type_qualifier_list STATIC assignment_expression pop ']'
4162 { $$ = DeclarationNode::newArray( $5, $3, true ); }
4163 ;
4164
4165// This pattern parses a declaration of an abstract variable, but does not allow "int ()" for a function pointer.
4166//
4167// struct S {
4168// int;
4169// int *;
4170// int [10];
4171// int (*)();
4172// };
4173
4174variable_abstract_declarator:
4175 variable_abstract_ptr
4176 | variable_abstract_array attribute_list_opt
4177 { $$ = $1->addQualifiers( $2 ); }
4178 | variable_abstract_function attribute_list_opt
4179 { $$ = $1->addQualifiers( $2 ); }
4180 ;
4181
4182variable_abstract_ptr:
4183 ptrref_operator
4184 { $$ = DeclarationNode::newPointer( nullptr, $1 ); }
4185 | ptrref_operator type_qualifier_list
4186 { $$ = DeclarationNode::newPointer( $2, $1 ); }
4187 | ptrref_operator variable_abstract_declarator
4188 { $$ = $2->addPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4189 | ptrref_operator type_qualifier_list variable_abstract_declarator
4190 { $$ = $3->addPointer( DeclarationNode::newPointer( $2, $1 ) ); }
4191 | '(' variable_abstract_ptr ')' attribute_list_opt // redundant parenthesis
4192 { $$ = $2->addQualifiers( $4 ); }
4193 ;
4194
4195variable_abstract_array:
4196 array_dimension
4197 | '(' variable_abstract_ptr ')' array_dimension
4198 { $$ = $2->addArray( $4 ); }
4199 | '(' variable_abstract_array ')' multi_array_dimension // redundant parenthesis
4200 { $$ = $2->addArray( $4 ); }
4201 | '(' variable_abstract_array ')' // redundant parenthesis
4202 { $$ = $2; }
4203 ;
4204
4205variable_abstract_function:
4206 '(' variable_abstract_ptr ')' '(' parameter_list_ellipsis_opt ')' // empty parameter list OBSOLESCENT (see 3)
4207 { $$ = $2->addParamList( $5 ); }
4208 | '(' variable_abstract_function ')' // redundant parenthesis
4209 { $$ = $2; }
4210 ;
4211
4212// This pattern parses a new-style declaration for a parameter variable or function prototype that is either an
4213// identifier or typedef name and allows the C99 array options, which can only appear in a parameter list.
4214
4215cfa_identifier_parameter_declarator_tuple: // CFA
4216 cfa_identifier_parameter_declarator_no_tuple
4217 | cfa_abstract_tuple
4218 | type_qualifier_list cfa_abstract_tuple
4219 { $$ = $2->addQualifiers( $1 ); }
4220 ;
4221
4222cfa_identifier_parameter_declarator_no_tuple: // CFA
4223 cfa_identifier_parameter_ptr
4224 | cfa_identifier_parameter_array
4225 ;
4226
4227cfa_identifier_parameter_ptr: // CFA
4228 // No SUE declaration in parameter list.
4229 ptrref_operator type_specifier_nobody
4230 { $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4231 | type_qualifier_list ptrref_operator type_specifier_nobody
4232 { $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4233 | ptrref_operator cfa_abstract_function
4234 { $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4235 | type_qualifier_list ptrref_operator cfa_abstract_function
4236 { $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4237 | ptrref_operator cfa_identifier_parameter_declarator_tuple
4238 { $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4239 | type_qualifier_list ptrref_operator cfa_identifier_parameter_declarator_tuple
4240 { $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4241 ;
4242
4243cfa_identifier_parameter_array: // CFA
4244 // Only the first dimension can be empty or have qualifiers. Empty dimension must be factored out due to
4245 // shift/reduce conflict with new-style empty (void) function return type.
4246 '[' ']' type_specifier_nobody
4247 { $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4248 | cfa_array_parameter_1st_dimension type_specifier_nobody
4249 { $$ = $2->addNewArray( $1 ); }
4250 | '[' ']' multi_array_dimension type_specifier_nobody
4251 { $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4252 | cfa_array_parameter_1st_dimension multi_array_dimension type_specifier_nobody
4253 { $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
4254 | multi_array_dimension type_specifier_nobody
4255 { $$ = $2->addNewArray( $1 ); }
4256
4257 | '[' ']' cfa_identifier_parameter_ptr
4258 { $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4259 | cfa_array_parameter_1st_dimension cfa_identifier_parameter_ptr
4260 { $$ = $2->addNewArray( $1 ); }
4261 | '[' ']' multi_array_dimension cfa_identifier_parameter_ptr
4262 { $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4263 | cfa_array_parameter_1st_dimension multi_array_dimension cfa_identifier_parameter_ptr
4264 { $$ = $3->addNewArray( $2 )->addNewArray( $1 ); }
4265 | multi_array_dimension cfa_identifier_parameter_ptr
4266 { $$ = $2->addNewArray( $1 ); }
4267 ;
4268
4269cfa_array_parameter_1st_dimension:
4270 '[' type_qualifier_list '*' ']' // remaining C99
4271 { $$ = DeclarationNode::newVarArray( $2 ); }
4272 | '[' type_qualifier_list assignment_expression ']'
4273 { $$ = DeclarationNode::newArray( $3, $2, false ); }
4274 | '[' declaration_qualifier_list assignment_expression ']'
4275 // declaration_qualifier_list must be used because of shift/reduce conflict with
4276 // assignment_expression, so a semantic check is necessary to preclude them as a type_qualifier cannot
4277 // appear in this context.
4278 { $$ = DeclarationNode::newArray( $3, $2, true ); }
4279 | '[' declaration_qualifier_list type_qualifier_list assignment_expression ']'
4280 { $$ = DeclarationNode::newArray( $4, $3->addQualifiers( $2 ), true ); }
4281 ;
4282
4283// This pattern parses a new-style declaration of an abstract variable or function prototype, i.e., there is no
4284// identifier to which the type applies, e.g.:
4285//
4286// [int] f( int ); // abstract variable parameter; no parameter name specified
4287// [int] f( [int] (int) ); // abstract function-prototype parameter; no parameter name specified
4288//
4289// These rules need LR(3):
4290//
4291// cfa_abstract_tuple identifier_or_type_name
4292// '[' cfa_parameter_list ']' identifier_or_type_name '(' cfa_parameter_list_ellipsis_opt ')'
4293//
4294// since a function return type can be syntactically identical to a tuple type:
4295//
4296// [int, int] t;
4297// [int, int] f( int );
4298//
4299// Therefore, it is necessary to look at the token after identifier_or_type_name to know when to reduce
4300// cfa_abstract_tuple. To make this LR(1), several rules have to be flattened (lengthened) to allow the necessary
4301// lookahead. To accomplish this, cfa_abstract_declarator has an entry point without tuple, and tuple declarations are
4302// duplicated when appearing with cfa_function_specifier.
4303
4304cfa_abstract_declarator_tuple: // CFA
4305 cfa_abstract_tuple
4306 | type_qualifier_list cfa_abstract_tuple
4307 { $$ = $2->addQualifiers( $1 ); }
4308 | cfa_abstract_declarator_no_tuple
4309 ;
4310
4311cfa_abstract_declarator_no_tuple: // CFA
4312 cfa_abstract_ptr
4313 | cfa_abstract_array
4314 ;
4315
4316cfa_abstract_ptr: // CFA
4317 ptrref_operator type_specifier
4318 { $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4319 | type_qualifier_list ptrref_operator type_specifier
4320 { $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4321 | ptrref_operator cfa_abstract_function
4322 { $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4323 | type_qualifier_list ptrref_operator cfa_abstract_function
4324 { $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4325 | ptrref_operator cfa_abstract_declarator_tuple
4326 { $$ = $2->addNewPointer( DeclarationNode::newPointer( nullptr, $1 ) ); }
4327 | type_qualifier_list ptrref_operator cfa_abstract_declarator_tuple
4328 { $$ = $3->addNewPointer( DeclarationNode::newPointer( $1, $2 ) ); }
4329 ;
4330
4331cfa_abstract_array: // CFA
4332 // Only the first dimension can be empty. Empty dimension must be factored out due to shift/reduce conflict with
4333 // empty (void) function return type.
4334 '[' ']' type_specifier
4335 { $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4336 | '[' ']' multi_array_dimension type_specifier
4337 { $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4338 | multi_array_dimension type_specifier
4339 { $$ = $2->addNewArray( $1 ); }
4340 | '[' ']' cfa_abstract_ptr
4341 { $$ = $3->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4342 | '[' ']' multi_array_dimension cfa_abstract_ptr
4343 { $$ = $4->addNewArray( $3 )->addNewArray( DeclarationNode::newArray( nullptr, nullptr, false ) ); }
4344 | multi_array_dimension cfa_abstract_ptr
4345 { $$ = $2->addNewArray( $1 ); }
4346 ;
4347
4348cfa_abstract_tuple: // CFA
4349 '[' cfa_abstract_parameter_list ']'
4350 { $$ = DeclarationNode::newTuple( $2 ); }
4351 | '[' type_specifier_nobody ELLIPSIS ']'
4352 { SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
4353 | '[' type_specifier_nobody ELLIPSIS constant_expression ']'
4354 { SemanticError( yylloc, "Tuple array currently unimplemented." ); $$ = nullptr; }
4355 ;
4356
4357cfa_abstract_function: // CFA
4358 '[' ']' '(' cfa_parameter_list_ellipsis_opt ')'
4359 { $$ = DeclarationNode::newFunction( nullptr, DeclarationNode::newTuple( nullptr ), $4, nullptr ); }
4360 | cfa_abstract_tuple '(' push cfa_parameter_list_ellipsis_opt pop ')'
4361 { $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
4362 | cfa_function_return '(' push cfa_parameter_list_ellipsis_opt pop ')'
4363 { $$ = DeclarationNode::newFunction( nullptr, $1, $4, nullptr ); }
4364 ;
4365
4366// 1) ISO/IEC 9899:1999 Section 6.7.2(2) : "At least one type specifier shall be given in the declaration specifiers in
4367// each declaration, and in the specifier-qualifier list in each structure declaration and type name."
4368//
4369// 2) ISO/IEC 9899:1999 Section 6.11.5(1) : "The placement of a storage-class specifier other than at the beginning of
4370// the declaration specifiers in a declaration is an obsolescent feature."
4371//
4372// 3) ISO/IEC 9899:1999 Section 6.11.6(1) : "The use of function declarators with empty parentheses (not
4373// prototype-format parameter type declarators) is an obsolescent feature."
4374//
4375// 4) ISO/IEC 9899:1999 Section 6.11.7(1) : "The use of function definitions with separate parameter identifier and
4376// declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature.
4377
4378// ************************ MISCELLANEOUS ********************************
4379
4380comma_opt: // redundant comma
4381 // empty
4382 | ','
4383 ;
4384
4385default_initializer_opt:
4386 // empty
4387 { $$ = nullptr; }
4388 | '=' assignment_expression
4389 { $$ = $2; }
4390 ;
4391
4392%%
4393
4394// ----end of grammar----
4395
4396// Local Variables: //
4397// mode: c++ //
4398// tab-width: 4 //
4399// compile-command: "bison -Wcounterexamples parser.yy" //
4400// End: //
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