X-Git-Url: https://feistymeow.org/gitweb/?a=blobdiff_plain;f=examples%2Fcpp_grammar_code%2FCxxParser.y;fp=examples%2Fcpp_grammar_code%2FCxxParser.y;h=0000000000000000000000000000000000000000;hb=5af202498131eb5eed099b84187e59889303faa8;hp=44cb9d80a8e68f4f6f47072d391be4f077a5ae27;hpb=a4d12589f1cd01826814842cde0b3eac95890bc9;p=feisty_meow.git diff --git a/examples/cpp_grammar_code/CxxParser.y b/examples/cpp_grammar_code/CxxParser.y deleted file mode 100644 index 44cb9d80..00000000 --- a/examples/cpp_grammar_code/CxxParser.y +++ /dev/null @@ -1,1162 +0,0 @@ -/* This is a yacc-able parser for the entire ISO C++ grammar with no unresolved conflicts. */ -/* The parse is SYNTACTICALLY consistent and requires no template or type name assistance. - * The grammar in the C++ standard notes that its grammar is a superset of the true - * grammar requiring semantic constraints to resolve ambiguities. This grammar is a really big - * superset unifying expressions and declarations, eliminating the type/non-type distinction, - * and iterating to find a consistent solution to the template/arith,metoic < ambiguity. - * As a result the grammar is much simpler, but requires the missing semantic constraints to be - * performed in a subsequent semantic pass, which is of course where they belong. This grammar will - * support conversion of C++ tokens into an Abstract Syntax Tree. A lot of further work is required to - * make that tree useful. - * - * The principles behind this grammar are described in my thesis on Meta-Compilation for C++, which - * may be found via http://www.computing.surrey.ac.uk/research/dsrg/fog/FogThesis.html. - * - * Author: E.D.Willink Ed.Willink@rrl.co.uk - * Date: 19-Jun-2001 - */ -/*StartTester*/ -%{ -#include -%} -/*EndTester*/ -/* - * The lexer (and/or a preprocessor) is expected to identify the following - * - * Punctuation: - */ -%type '+' '-' '*' '/' '%' '^' '&' '|' '~' '!' '<' '>' '=' ':' '[' ']' '{' '}' '(' ')' -%type '?' '.' '\'' '\"' '\\' '@' '$' ';' ',' -/* - * Punctuation sequences - */ -%term ARROW ARROW_STAR DEC EQ GE INC LE LOG_AND LOG_OR NE SHL SHR -%term ASS_ADD ASS_AND ASS_DIV ASS_MOD ASS_MUL ASS_OR ASS_SHL ASS_SHR ASS_SUB ASS_XOR -%term DOT_STAR ELLIPSIS SCOPE -/* - * Reserved words - */ -%term PRIVATE PROTECTED PUBLIC -%term BOOL CHAR DOUBLE FLOAT INT LONG SHORT SIGNED UNSIGNED VOID WCHAR_T -%term CLASS ENUM NAMESPACE STRUCT TYPENAME UNION -%term CONST VOLATILE -%term AUTO EXPLICIT EXPORT EXTERN FRIEND INLINE MUTABLE REGISTER STATIC TEMPLATE TYPEDEF USING VIRTUAL -%term ASM BREAK CASE CATCH CONST_CAST CONTINUE DEFAULT DELETE DO DYNAMIC_CAST -%term ELSE FALSE FOR GOTO IF NEW OPERATOR REINTERPRET_CAST RETURN -%term SIZEOF STATIC_CAST SWITCH THIS THROW TRUE TRY TYPEID WHILE -/* - * Parametric values. - */ -%term CharacterLiteral -%term FloatingLiteral -%term Identifier -%term IntegerLiteral -%term NumberLiteral -%term StringLiteral -/* - * The lexer need not treat '0' as distinct from IntegerLiteral in the hope that pure-specifier can - * be distinguished, It isn't. Semantic rescue from = constant-expression is necessary. - * - * The lexer is not required to distinguish template or type names, although a slight simplification to the - * grammar and elaboration of the action rules could make good use of template name information. - * - * In return for not needing to use semantic information, the lexer must support back-tracking, which - * is easily achieved by a simple linear buffer, a reference implementation of which may be found in the - * accompanying CxxParsing.cxx. Back-tracking is used to support: - * - * Binary search for a consistent parse of the template/arithmetic ambiguity. - * start_search() initialises the search - * advance_search() iterates the search - * end_search() cleans up after a search - * template_test() maintains context during a search - * - * Lookahead to resolve the inheritance/anonymous bit-field similarity - * mark() saves the starting context - * unmark() pops it - * rewind_colon() restores the context and forces the missing : - * - * Lookahead to resolve type 1 function parameter ambiguities - * mark_type1() potentially marks the starting position - * mark() marks the pre { position - * remark() rewinds to the starting position - * unmark() pops the starting position - * - * Note that lookaheads may nest. - */ - -/* - * The parsing philosophy is unusual. The major ambiguities are resolved by creating a unified superset - * grammar rather than non-overlapping subgrammars. Thus the grammar for parameter-declaration covers an - * assignment-expression. Minor ambiguities whose resolution by supersetting would create more - * ambiguities are resolved the normal way with partitioned subgrammars. - * This eliminates the traditional expression/declaration and constructor/parenthesised declarator - * ambiguities at the syntactic level. A subsequent semantic level has to sort the problems out. - * The generality introduces four bogus ambiguities and defers the cast ambiguity for resolution - * once semantic information is available. - * - * The C++ grammar comprises 561 rules and uses 897 states in yacc, with 0 unresolved conflicts. - * 23 conflicts from 10 ambiguities are resolved by 8 %prec's, so that yacc and bison report 0 conflicts. - * - * The ambiguities are: - * 1) dangling else resolved to inner-most if - * 1 conflict in 1 state on else - * 2) < as start-template or less-than - * 1 conflict in 1 states on < - * 3) a :: b :: c resolved to favour a::b::c rather than a::b ::c or a ::b::c - * 1 conflicts in 1 state for :: - * 4) pointer operators maximised at end of conversion id/new in preference to binary operators - * 2 conflicts in 4 states on * and & - * 5a) (a)@b resolved to favour binary a@b rather than cast unary (a)(@b) - * 5b) (a)(b) resolved to favour cast rather than call - * 8 conflicts in 1 state for the 8 prefix operators: 6 unaries and ( and [. - * 6) enum name { resolved to enum-specifier rather than function - * 1 conflict in 1 state on { - * 7) class name { resolved to class-specifier rather than function - * 1 conflict in 1 state on { - * 8) extern "C" resolved to linkage-specification rather than declaration - * 1 conflict in 1 state on StringLiteral - * 9) class X : forced to go through base-clause look-ahead - * 1 conflict in 1 state on : - * 10) id : forced to label_statement rather than constructor_head - * 0 conflicts - but causes a double state for 2) - * of which - * 1 is a fundamental C conflict - always correctly resolved - * can be removed - see the Java spec - * 2, 3, 4 are fundamental C++ conflicts - * 2 always consistently resolved by iteration - * 3 always correctly resolved - * 4 always correctly resolved - * 5 is a result of not using type information - deferred for semantic repair - * 6,7 are caused by parsing over-generous superset - always correctly resolved - * 8 is caused by parsing over-generous superset - always correctly resolved - * can be removed at the expense of 7 rules and 5 states. - * 9 is a look-ahead trick - always correctly resolved - * could be removed by marking one token sooner - * 10 is caused by parsing over-generous superset - always correctly resolved - * - * The hard problem of distinguishing - * class A { class B : C, D, E { -- A::B privately inherits C, D and E - * class A { class B : C, D, E ; -- C is width of anon bit-field - * is resolved by using a lookahead that assumes inheritance and rewinds for the bit-field. - * - * The potential shift-reduce conflict on > is resolved by flattening part of the expression grammar - * to know when the next > is template end or arithmetic >. - * - * The grammar is SYNTACTICALLY context-free with respect to type. No semantic assistance is required - * during syntactic analysis. However the cast ambiguity is deferred and must be recovered - * after syntactic analysis of a statement has completed. - * - * The grammar is SYNTACTICALLY context-free with respect to template-names. This is achieved by - * organising a binary search over all possible template/arithmetic ambiguities with respect to - * the enclosing statement. This is potentially exponentially inefficient but well-behaved in practice. - * Approximately 1% of statements trigger a search and approximately 1% of those are misparsed, - * requiring the semantic analysis to check and correct once template information is available. - * 1.5 parse attempts are required on average per ambiguous statement. - * - * The grammar supports type I function declarations at severe impediment to efficiency. A lookahead - * has to be performed after almost every non-statement close parenthesis. A one-line plus corollary - * change to postfix_expression is commented and strongly recommended to make this grammar as - * efficient as the rather large number of reduction levels permits. - * - * Error recovery occurs mostly at the statement/declaration level. Recovery also occurs at - * the list-element level where this poses no hazard to statement/declaration level recovery. - * Note that since error propagation interacts with the lookaheads for template iteration or - * type 1 function arguments, introduction of finer grained error recovery may repair a false - * parse and so cause a misparse. - * - * The following syntactic analysis errors occur, but are correctable semantically: - * (cast)unary-op expr is parsed as (parenthesised)binary-op expr - * The semantic test should look for a binary/call with a (type) as its left child. - * (parenthesised)(arguments) is parsed as (cast)(parenthesised) - * The semantic test should look for a cast with a non-type as its left child. - * template < and arithmetic < may be cross-parsed (unless semnatic help is provided) - * approximately 0.01% are misparsed, and must be sorted out - not easy. - * - * The syntactic analysis defers the following ambiguities for semantic resolution: - * declaration/expression is parsed as a unified concept - * Use type and context to complete the parse. - * ~class-name is parsed as unary~ name - * The semantic test should look for ~ with a type as its child. - * delete[] expr is parsed as delete []expr - * The semantic test should look for delete with a [] cast of its child. - * operator new/delete[] are parsed as array of operator new/delete - * The semantic test should look for array of operator new/delete - * or activate the two extra commented rules in operator - * template of an explicit_instantiation is buried deep in the tree - * dig it out - * pure-specifier and constant-initializer are covered by assignment-expression - * just another of the deferred declaration/expression ambiguities - * sizeof and typeid don't distinguish type/value syntaxes - * probably makes life polymorphically easier - */ -/* Action code is supplied by a large number of YACC_xxx macros that can be redefined - * by rewriting the include file rather than the grammar. The number of macros is - * slightly reduced by using the following protocols - * - * YACC_LIST(0,0) create empty list (may safely return 0). - * YACC_LIST(0,E) create new list with content E (may return 0 if above returned non-0). - * YACC_LIST(L,E) add E to L - * YACC_LIST(L,0) error propagation, adding nothing to L. - */ -%type bang -%type colon_mark mark mark_type1 -%type nest - -%type access_specifier -%type base_specifier -%type base_specifier_list -%type built_in_type_id built_in_type_specifier -%type <_class> class_specifier_head -%type class_key -%type condition condition.opt -%type cv_qualifier cv_qualifier_seq.opt -%type decl_specifier_affix decl_specifier_prefix decl_specifier_suffix function_specifier storage_class_specifier -%type accessibility_specifier asm_definition block_declaration declaration explicit_specialization -%type looped_declaration looping_declaration namespace_alias_definition -%type specialised_block_declaration specialised_declaration template_declaration using_directive -%type compound_declaration declaration_seq.opt -%type nested_ptr_operator ptr_operator -%type delete_expression -%type enumerator_definition -%type enumerator_clause enumerator_list enumerator_list_head -%type exception_declaration -%type exception_specification -%type abstract_declarator.opt abstract_expression abstract_parameter_declaration abstract_pointer_declaration -%type additive_expression and_expression assignment_expression -%type bit_field_declaration bit_field_init_declaration bit_field_width boolean_literal -%type cast_expression conditional_expression constant_expression conversion_type_id ctor_definition -%type direct_abstract_declarator direct_abstract_declarator.opt direct_new_declarator -%type equality_expression exclusive_or_expression expression expression.opt -%type for_init_statement func_definition function_definition -%type inclusive_or_expression init_declaration literal logical_and_expression logical_or_expression -%type multiplicative_expression new_declarator new_type_id -%type pm_expression postfix_expression primary_expression ptr_operator_seq ptr_operator_seq.opt -%type relational_expression shift_expression simple_declaration special_parameter_declaration -%type templated_throw_expression throw_expression templated_abstract_declaration templated_and_expression -%type templated_assignment_expression templated_conditional_expression templated_equality_expression -%type templated_exclusive_or_expression templated_expression templated_inclusive_or_expression templated_logical_and_expression -%type templated_logical_or_expression templated_relational_expression type_id unary_expression -%type constructor_head expression_list expression_list.opt init_declarations -%type new_initializer.opt templated_expression_list type_id_list -%type function_block function_body function_try_block try_block -%type handler -%type handler_seq -%type braced_initializer initializer_clause looped_initializer_clause looping_initializer_clause -%type initializer_list -%type global_scope -%type assignment_operator -%type start_search start_search1 -%type mem_initializer -%type ctor_initializer ctor_initializer.opt mem_initializer_list mem_initializer_list_head -%type class_specifier conversion_function_id declarator_id destructor_id -%type elaborated_class_specifier elaborated_enum_specifier elaborated_type_specifier elaborate_type_specifier -%type enum_specifier enumerator id identifier_word id_scope identifier linkage_specification -%type namespace_definition nested_id nested_pseudo_destructor_id nested_special_function_id -%type mem_initializer_id operator operator_function_id pseudo_destructor_id scoped_id scoped_pseudo_destructor_id scoped_special_function_id -%type simple_type_specifier special_function_id suffix_built_in_decl_specifier suffix_named_decl_specifier.bi -%type suffix_built_in_decl_specifier.raw suffix_decl_specified_ids suffix_named_decl_specifiers -%type suffix_named_decl_specifiers.sf suffix_decl_specified_scope suffix_named_decl_specifier -%type template_id type_specifier -%type new_expression -%type parameter_declaration templated_parameter_declaration -%type parameters_clause parameter_declaration_clause parameter_declaration_list -%type parenthesis_clause -%type star_ptr_operator -%type simple_type_parameter -%type compound_statement control_statement declaration_statement iteration_statement jump_statement -%type labeled_statement looped_statement looping_statement selection_statement statement -%type statement_seq.opt -%type string -%type template_argument -%type template_argument_list -%type template_parameter -%type template_parameter_clause template_parameter_list -%type templated_type_parameter -%type type1_parameters -%type util - -/* - * C++ productions replaced by more generalised FOG productions - */ -%type looped_member_declaration looping_member_declaration member_declaration using_declaration -%type member_specification.opt -%type member_init_declaration simple_member_declaration -%type member_init_declarations - - -%nonassoc SHIFT_THERE -%nonassoc SCOPE ELSE INC DEC '+' '-' '*' '&' '[' '{' '<' ':' StringLiteral -%nonassoc REDUCE_HERE_MOSTLY -%nonassoc '(' -/*%nonassoc REDUCE_HERE */ - -%start translation_unit -%% - -/* - * The %prec resolves a conflict in identifier_word : which is forced to be a shift of a label for - * a labeled-statement rather than a reduction for the name of a bit-field or generalised constructor. - * This is pretty dubious syntactically but correct for all semantic possibilities. - * The shift is only activated when the ambiguity exists at the start of a statement. In this context - * a bit-field declaration or constructor definition are not allowed. - */ -identifier_word: Identifier { $$ = $1; } -identifier: identifier_word %prec SHIFT_THERE -/* - * The %prec resolves the $014.2-3 ambiguity: - * Identifier '<' is forced to go through the is-it-a-template-name test - * All names absorb TEMPLATE with the name, so that no template_test is performed for them. - * This requires all potential declarations within an expression to perpetuate this policy - * and thereby guarantee the ultimate coverage of explicit_instantiation. - */ -id: identifier %prec SHIFT_THERE /* Force < through test */ { $$ = YACC_NAME($1); } - | identifier template_test '+' template_argument_list '>' { $$ = YACC_TEMPLATE_NAME($1, $4); } - | identifier template_test '+' '>' { $$ = $1; ERRMSG("Empty template-argument-list"); } - | identifier template_test '-' /* requeued < follows */ { $$ = YACC_NAME($1); } - | template_id -template_test: '<' /* Queue '+' or '-' < as follow on */ { template_test(); } -global_scope: SCOPE { $$ = IS_DEFAULT; } - | TEMPLATE global_scope { $$ = IS_TEMPLATE; } -id_scope: id SCOPE { $$ = YACC_NESTED_SCOPE($1); } -/* - * A :: B :: C; is ambiguous How much is type and how much name ? - * The %prec maximises the (type) length which is the $07.1-2 semantic constraint. - */ -nested_id: id %prec SHIFT_THERE /* Maximise length */ - | id_scope nested_id { $$ = YACC_NESTED_ID($1, $2); } -scoped_id: nested_id - | global_scope nested_id { $$ = YACC_GLOBAL_ID($1, $2); } - -/* - * destructor_id has to be held back to avoid a conflict with a one's complement as per $05.3.1-9, - * It gets put back only when scoped or in a declarator_id, which is only used as an explicit member name. - * Declarations of an unscoped destructor are always parsed as a one's complement. - */ -destructor_id: '~' id { $$ = YACC_DESTRUCTOR_ID($2); } - | TEMPLATE destructor_id { $$ = YACC_SET_TEMPLATE_ID($2); } -special_function_id: conversion_function_id - | operator_function_id - | TEMPLATE special_function_id { $$ = YACC_SET_TEMPLATE_ID($2); } -nested_special_function_id: special_function_id - | id_scope destructor_id { $$ = YACC_NESTED_ID($1, $2); } - | id_scope nested_special_function_id { $$ = YACC_NESTED_ID($1, $2); } -scoped_special_function_id: nested_special_function_id - | global_scope nested_special_function_id { $$ = YACC_GLOBAL_ID($1, $2); } - -/* declarator-id is all names in all scopes, except reserved words */ -declarator_id: scoped_id - | scoped_special_function_id - | destructor_id - -/* The standard defines pseudo-destructors in terms of type-name, which is class/enum/typedef, of which - * class-name is covered by a normal destructor. pseudo-destructors are supposed to support ~int() in - * templates, so the grammar here covers built-in names. Other names are covered by the lack of - * identifier/type discrimination. - */ -built_in_type_id: built_in_type_specifier - | built_in_type_id built_in_type_specifier { $$ = YACC_BUILT_IN_IDS($1, $2); } -pseudo_destructor_id: built_in_type_id SCOPE '~' built_in_type_id { $$ = YACC_PSEUDO_DESTRUCTOR_ID($1, $4); } - | '~' built_in_type_id { $$ = YACC_PSEUDO_DESTRUCTOR_ID(0, $2); } - | TEMPLATE pseudo_destructor_id { $$ = YACC_SET_TEMPLATE_ID($2); } -nested_pseudo_destructor_id: pseudo_destructor_id - | id_scope nested_pseudo_destructor_id { $$ = YACC_NESTED_ID($1, $2); } -scoped_pseudo_destructor_id: nested_pseudo_destructor_id - | global_scope scoped_pseudo_destructor_id { $$ = YACC_GLOBAL_ID($1, $2); } - -/*--------------------------------------------------------------------------------------------------- - * A.2 Lexical conventions - *---------------------------------------------------------------------------------------------------*/ -/* - * String concatenation is a phase 6, not phase 7 activity so does not really belong in the grammar. - * However it may be convenient to have it here to make this grammar fully functional. - * Unfortunately it introduces a conflict with the generalised parsing of extern "C" which - * is correctly resolved to maximise the string length as the token source should do anyway. - */ -string: StringLiteral { $$ = $1; } -/*string: StringLiteral %prec SHIFT_THERE { $$ = YACC_STRINGS($1, 0); } */ -/* | StringLiteral string -- Perverse order avoids conflicts -- { $$ = YACC_STRINGS($1, $2); } */ -literal: IntegerLiteral { $$ = YACC_INTEGER_LITERAL_EXPRESSION($1); } - | CharacterLiteral { $$ = YACC_CHARACTER_LITERAL_EXPRESSION($1); } - | FloatingLiteral { $$ = YACC_FLOATING_LITERAL_EXPRESSION($1); } - | string { $$ = YACC_STRING_LITERAL_EXPRESSION($1); } - | boolean_literal -boolean_literal: FALSE { $$ = YACC_FALSE_EXPRESSION(); } - | TRUE { $$ = YACC_TRUE_EXPRESSION(); } - -/*--------------------------------------------------------------------------------------------------- - * A.3 Basic concepts - *---------------------------------------------------------------------------------------------------*/ -translation_unit: declaration_seq.opt { YACC_RESULT($1); } - -/*--------------------------------------------------------------------------------------------------- - * A.4 Expressions - *--------------------------------------------------------------------------------------------------- - * primary_expression covers an arbitrary sequence of all names with the exception of an unscoped destructor, - * which is parsed as its unary expression which is the correct disambiguation (when ambiguous). - * This eliminates the traditional A(B) meaning A B ambiguity, since we never have to tack an A onto - * the front of something that might start with (. The name length got maximised ab initio. The downside - * is that semantic interpretation must split the names up again. - * - * Unification of the declaration and expression syntax means that unary and binary pointer declarator operators: - * int * * name - * are parsed as binary and unary arithmetic operators (int) * (*name). Since type information is not used - * ambiguities resulting from a cast - * (cast)*(value) - * are resolved to favour the binary rather than the cast unary to ease AST clean-up. - * The cast-call ambiguity must be resolved to the cast to ensure that (a)(b)c can be parsed. - * - * The problem of the functional cast ambiguity - * name(arg) - * as call or declaration is avoided by maximising the name within the parsing kernel. So - * primary_id_expression picks up - * extern long int const var = 5; - * as an assignment to the syntax parsed as "extern long int const var". The presence of two names is - * parsed so that "extern long into const" is distinguished from "var" considerably simplifying subsequent - * semantic resolution. - * - * The generalised name is a concatenation of potential type-names (scoped identifiers or built-in sequences) - * plus optionally one of the special names such as an operator-function-id, conversion-function-id or - * destructor as the final name. - */ -primary_expression: literal - | THIS { $$ = YACC_THIS_EXPRESSION(); } - | suffix_decl_specified_ids { $$ = $1; } -/* | SCOPE identifier -- covered by suffix_decl_specified_ids */ -/* | SCOPE operator_function_id -- covered by suffix_decl_specified_ids */ -/* | SCOPE qualified_id -- covered by suffix_decl_specified_ids */ - | abstract_expression %prec REDUCE_HERE_MOSTLY /* Prefer binary to unary ops, cast to call */ -/* | id_expression -- covered by suffix_decl_specified_ids */ - -/* - * Abstract-expression covers the () and [] of abstract-declarators. - */ -abstract_expression: parenthesis_clause { $$ = YACC_ABSTRACT_FUNCTION_EXPRESSION($1); } - | '[' expression.opt ']' { $$ = YACC_ABSTRACT_ARRAY_EXPRESSION($2); } - | TEMPLATE parenthesis_clause { $$ = YACC_SET_TEMPLATE_EXPRESSION(YACC_ABSTRACT_FUNCTION_EXPRESSION($2)); } - -/* Type I function parameters are ambiguous with respect to the generalised name, so we have to do a lookahead following - * any function-like parentheses. This unfortunately hits normal code, so kill the -- lines and add the ++ lines for efficiency. - * Supporting Type I code under the superset causes perhaps 25% of lookahead parsing. Sometimes complete class definitions - * get traversed since they are valid generalised type I parameters! - */ -type1_parameters: /*----*/ parameter_declaration_list ';' { $$ = YACC_TYPE1_PARAMETERS(0, $1); } - | /*----*/ type1_parameters parameter_declaration_list ';' { $$ = YACC_TYPE1_PARAMETERS($1, $2); } -mark_type1: /* empty */ { $$ = mark_type1(); } -postfix_expression: primary_expression -/* | /++++++/ postfix_expression parenthesis_clause { $$ = YACC_CALL_EXPRESSION($1, $2); } */ - | /*----*/ postfix_expression parenthesis_clause mark_type1 '-' { $$ = YACC_CALL_EXPRESSION($1, $2); } - | /*----*/ postfix_expression parenthesis_clause mark_type1 '+' type1_parameters mark '{' error - /*----*/ { yyerrok; remark_type1($6); unmark(); unmark($5); $$ = YACC_TYPE1_EXPRESSION($1, $2, $5); } - | /*----*/ postfix_expression parenthesis_clause mark_type1 '+' type1_parameters mark error - /*----*/ { yyerrok; remark_type1($3); unmark(); unmark(); $$ = YACC_CALL_EXPRESSION($1, $2); } - | /*----*/ postfix_expression parenthesis_clause mark_type1 '+' error - /*----*/ { yyerrok; remark_type1($3); unmark(); $$ = YACC_CALL_EXPRESSION($1, $2); } - | postfix_expression '[' expression.opt ']' { $$ = YACC_ARRAY_EXPRESSION($1, $3); } -/* | destructor_id '[' expression.opt ']' -- not semantically valid */ -/* | destructor_id parenthesis_clause -- omitted to resolve known ambiguity */ -/* | simple_type_specifier '(' expression_list.opt ')' -- simple_type_specifier is a primary_expression */ - | postfix_expression '.' declarator_id { $$ = YACC_DOT_EXPRESSION($1, $3); } -/* | postfix_expression '.' TEMPLATE declarator_id -- TEMPLATE absorbed into declarator_id. */ - | postfix_expression '.' scoped_pseudo_destructor_id { $$ = YACC_DOT_EXPRESSION($1, $3); } - | postfix_expression ARROW declarator_id { $$ = YACC_ARROW_EXPRESSION($1, $3); } -/* | postfix_expression ARROW TEMPLATE declarator_id -- TEMPLATE absorbed into declarator_id. */ - | postfix_expression ARROW scoped_pseudo_destructor_id { $$ = YACC_ARROW_EXPRESSION($1, $3); } - | postfix_expression INC { $$ = YACC_POST_INCREMENT_EXPRESSION($1); } - | postfix_expression DEC { $$ = YACC_POST_DECREMENT_EXPRESSION($1); } - | DYNAMIC_CAST '<' type_id '>' '(' expression ')' { $$ = YACC_DYNAMIC_CAST_EXPRESSION($3, $6); } - | STATIC_CAST '<' type_id '>' '(' expression ')' { $$ = YACC_STATIC_CAST_EXPRESSION($3, $6); } - | REINTERPRET_CAST '<' type_id '>' '(' expression ')' { $$ = YACC_REINTERPRET_CAST_EXPRESSION($3, $6); } - | CONST_CAST '<' type_id '>' '(' expression ')' { $$ = YACC_CONST_CAST_EXPRESSION($3, $6); } - | TYPEID parameters_clause { $$ = YACC_TYPEID_EXPRESSION($2); } -/* | TYPEID '(' expression ')' -- covered by parameters_clause */ -/* | TYPEID '(' type_id ')' -- covered by parameters_clause */ -expression_list.opt: /* empty */ { $$ = YACC_EXPRESSIONS(0, 0); } - | expression_list -expression_list: assignment_expression { $$ = YACC_EXPRESSIONS(0, $1); } - | expression_list ',' assignment_expression { $$ = YACC_EXPRESSIONS($1, $3); } - -unary_expression: postfix_expression - | INC cast_expression { $$ = YACC_PRE_INCREMENT_EXPRESSION($2); } - | DEC cast_expression { $$ = YACC_PRE_DECREMENT_EXPRESSION($2); } - | ptr_operator cast_expression { $$ = YACC_POINTER_EXPRESSION($1, $2); } -/* | '*' cast_expression -- covered by ptr_operator */ -/* | '&' cast_expression -- covered by ptr_operator */ -/* | decl_specifier_seq '*' cast_expression -- covered by binary operator */ -/* | decl_specifier_seq '&' cast_expression -- covered by binary operator */ - | suffix_decl_specified_scope star_ptr_operator cast_expression /* covers e.g int ::type::* const t = 4 */ - { $$ = YACC_SCOPED_POINTER_EXPRESSION($1, $2, $3); } - | '+' cast_expression { $$ = YACC_PLUS_EXPRESSION($2); } - | '-' cast_expression { $$ = YACC_MINUS_EXPRESSION($2); } - | '!' cast_expression { $$ = YACC_NOT_EXPRESSION($2); } - | '~' cast_expression { $$ = YACC_COMPLEMENT_EXPRESSION($2); } - | SIZEOF unary_expression { $$ = YACC_SIZEOF_EXPRESSION($2); } -/* | SIZEOF '(' type_id ')' -- covered by unary_expression */ - | new_expression { $$ = $1; } - | global_scope new_expression { $$ = YACC_GLOBAL_EXPRESSION($1, $2); } - | delete_expression { $$ = $1; } - | global_scope delete_expression { $$ = YACC_GLOBAL_EXPRESSION($1, $2); } -/* | DELETE '[' ']' cast_expression -- covered by DELETE cast_expression since cast_expression covers ... */ -/* | SCOPE DELETE '[' ']' cast_expression // ... abstract_expression cast_expression and so [] cast_expression */ - -delete_expression: DELETE cast_expression /* also covers DELETE[] cast_expression */ - { $$ = YACC_DELETE_EXPRESSION($2); } -new_expression: NEW new_type_id new_initializer.opt { $$ = YACC_NEW_TYPE_ID_EXPRESSION(0, $2, $3); } - | NEW parameters_clause new_type_id new_initializer.opt { $$ = YACC_NEW_TYPE_ID_EXPRESSION($2, $3, $4); } - | NEW parameters_clause { $$ = YACC_NEW_EXPRESSION($2, 0, 0); } -/* | NEW '(' type-id ')' -- covered by parameters_clause */ - | NEW parameters_clause parameters_clause new_initializer.opt { $$ = YACC_NEW_EXPRESSION($2, $3, $4); } -/* | NEW '(' type-id ')' new_initializer -- covered by parameters_clause parameters_clause */ -/* | NEW parameters_clause '(' type-id ')' -- covered by parameters_clause parameters_clause */ - /* ptr_operator_seq.opt production reused to save a %prec */ -new_type_id: type_specifier ptr_operator_seq.opt { $$ = YACC_TYPED_EXPRESSION($1, $2); } - | type_specifier new_declarator { $$ = YACC_TYPED_EXPRESSION($1, $2); } - | type_specifier new_type_id { $$ = YACC_TYPED_EXPRESSION($1, $2); } -new_declarator: ptr_operator new_declarator { $$ = YACC_POINTER_EXPRESSION($1, $2); } - | direct_new_declarator -direct_new_declarator: '[' expression ']' { $$ = YACC_ABSTRACT_ARRAY_EXPRESSION($2); } - | direct_new_declarator '[' constant_expression ']' { $$ = YACC_ARRAY_EXPRESSION($1, $3); } -new_initializer.opt: /* empty */ { $$ = YACC_EXPRESSIONS(0, 0); } - | '(' expression_list.opt ')' { $$ = $2; } - -/* cast-expression is generalised to support a [] as well as a () prefix. This covers the omission of DELETE[] which when - * followed by a parenthesised expression was ambiguous. It also covers the gcc indexed array initialisation for free. - */ -cast_expression: unary_expression - | abstract_expression cast_expression { $$ = YACC_CAST_EXPRESSION($1, $2); } -/* | '(' type_id ')' cast_expression -- covered by abstract_expression */ - -pm_expression: cast_expression - | pm_expression DOT_STAR cast_expression { $$ = YACC_DOT_STAR_EXPRESSION($1, $3); } - | pm_expression ARROW_STAR cast_expression { $$ = YACC_ARROW_STAR_EXPRESSION($1, $3); } -multiplicative_expression: pm_expression - | multiplicative_expression star_ptr_operator pm_expression { $$ = YACC_MULTIPLY_EXPRESSION($1, $2, $3); } - | multiplicative_expression '/' pm_expression { $$ = YACC_DIVIDE_EXPRESSION($1, $3); } - | multiplicative_expression '%' pm_expression { $$ = YACC_MODULUS_EXPRESSION($1, $3); } -additive_expression: multiplicative_expression - | additive_expression '+' multiplicative_expression { $$ = YACC_ADD_EXPRESSION($1, $3); } - | additive_expression '-' multiplicative_expression { $$ = YACC_SUBTRACT_EXPRESSION($1, $3); } -shift_expression: additive_expression - | shift_expression SHL additive_expression { $$ = YACC_SHIFT_LEFT_EXPRESSION($1, $3); } - | shift_expression SHR additive_expression { $$ = YACC_SHIFT_RIGHT_EXPRESSION($1, $3); } -relational_expression: shift_expression - | relational_expression '<' shift_expression { $$ = YACC_LESS_THAN_EXPRESSION($1, $3); } - | relational_expression '>' shift_expression { $$ = YACC_GREATER_THAN_EXPRESSION($1, $3); } - | relational_expression LE shift_expression { $$ = YACC_LESS_EQUAL_EXPRESSION($1, $3); } - | relational_expression GE shift_expression { $$ = YACC_GREATER_EQUAL_EXPRESSION($1, $3); } -equality_expression: relational_expression - | equality_expression EQ relational_expression { $$ = YACC_EQUAL_EXPRESSION($1, $3); } - | equality_expression NE relational_expression { $$ = YACC_NOT_EQUAL_EXPRESSION($1, $3); } -and_expression: equality_expression - | and_expression '&' equality_expression { $$ = YACC_AND_EXPRESSION($1, $3); } -exclusive_or_expression: and_expression - | exclusive_or_expression '^' and_expression { $$ = YACC_EXCLUSIVE_OR_EXPRESSION($1, $3); } -inclusive_or_expression: exclusive_or_expression - | inclusive_or_expression '|' exclusive_or_expression { $$ = YACC_INCLUSIVE_OR_EXPRESSION($1, $3); } -logical_and_expression: inclusive_or_expression - | logical_and_expression LOG_AND inclusive_or_expression { $$ = YACC_LOGICAL_AND_EXPRESSION($1, $3); } -logical_or_expression: logical_and_expression - | logical_or_expression LOG_OR logical_and_expression { $$ = YACC_LOGICAL_OR_EXPRESSION($1, $3); } -conditional_expression: logical_or_expression - | logical_or_expression '?' expression ':' assignment_expression - { $$ = YACC_CONDITIONAL_EXPRESSION($1, $3, $5); } - -/* assignment-expression is generalised to cover the simple assignment of a braced initializer in order to contribute to the - * coverage of parameter-declaration and init-declaration. - */ -assignment_expression: conditional_expression - | logical_or_expression assignment_operator assignment_expression { $$ = YACC_ASSIGNMENT_EXPRESSION($1, $2, $3); } - | logical_or_expression '=' braced_initializer { $$ = YACC_ASSIGNMENT_EXPRESSION($1, $2, $3); } - | throw_expression -assignment_operator: '=' | ASS_ADD | ASS_AND | ASS_DIV | ASS_MOD | ASS_MUL | ASS_OR | ASS_SHL | ASS_SHR | ASS_SUB | ASS_XOR - -/* expression is widely used and usually single-element, so the reductions are arranged so that a - * single-element expression is returned as is. Multi-element expressions are parsed as a list that - * may then behave polymorphically as an element or be compacted to an element. */ -expression.opt: /* empty */ { $$ = YACC_EXPRESSION(0); } - | expression -expression: assignment_expression - | expression_list ',' assignment_expression { $$ = YACC_EXPRESSION(YACC_EXPRESSIONS($1, $3)); } -constant_expression: conditional_expression - -/* The grammar is repeated for when the parser stack knows that the next > must end a template. - */ -templated_relational_expression: shift_expression - | templated_relational_expression '<' shift_expression { $$ = YACC_LESS_THAN_EXPRESSION($1, $3); } - | templated_relational_expression LE shift_expression { $$ = YACC_LESS_EQUAL_EXPRESSION($1, $3); } - | templated_relational_expression GE shift_expression { $$ = YACC_GREATER_EQUAL_EXPRESSION($1, $3); } -templated_equality_expression: templated_relational_expression - | templated_equality_expression EQ templated_relational_expression { $$ = YACC_EQUAL_EXPRESSION($1, $3); } - | templated_equality_expression NE templated_relational_expression { $$ = YACC_NOT_EQUAL_EXPRESSION($1, $3); } -templated_and_expression: templated_equality_expression - | templated_and_expression '&' templated_equality_expression { $$ = YACC_AND_EXPRESSION($1, $3); } -templated_exclusive_or_expression: templated_and_expression - | templated_exclusive_or_expression '^' templated_and_expression - { $$ = YACC_EXCLUSIVE_OR_EXPRESSION($1, $3); } -templated_inclusive_or_expression: templated_exclusive_or_expression - | templated_inclusive_or_expression '|' templated_exclusive_or_expression - { $$ = YACC_INCLUSIVE_OR_EXPRESSION($1, $3); } -templated_logical_and_expression: templated_inclusive_or_expression - | templated_logical_and_expression LOG_AND templated_inclusive_or_expression - { $$ = YACC_LOGICAL_AND_EXPRESSION($1, $3); } -templated_logical_or_expression: templated_logical_and_expression - | templated_logical_or_expression LOG_OR templated_logical_and_expression - { $$ = YACC_LOGICAL_OR_EXPRESSION($1, $3); } -templated_conditional_expression: templated_logical_or_expression - | templated_logical_or_expression '?' templated_expression ':' templated_assignment_expression - { $$ = YACC_CONDITIONAL_EXPRESSION($1, $3, $5); } -templated_assignment_expression: templated_conditional_expression - | templated_logical_or_expression assignment_operator templated_assignment_expression - { $$ = YACC_ASSIGNMENT_EXPRESSION($1, $2, $3); } - | templated_throw_expression -templated_expression: templated_assignment_expression - | templated_expression_list ',' templated_assignment_expression - { $$ = YACC_EXPRESSION(YACC_EXPRESSIONS($1, $3)); } -templated_expression_list: templated_assignment_expression { $$ = YACC_EXPRESSIONS(0, $1); } - | templated_expression_list ',' templated_assignment_expression { $$ = YACC_EXPRESSIONS($1, $3); } - -/*--------------------------------------------------------------------------------------------------- - * A.5 Statements - *--------------------------------------------------------------------------------------------------- - * Parsing statements is easy once simple_declaration has been generalised to cover expression_statement. - */ -looping_statement: start_search looped_statement { $$ = YACC_LINED_STATEMENT($2, $1); end_search($$); } -looped_statement: statement - | advance_search '+' looped_statement { $$ = $3; } - | advance_search '-' { $$ = 0; } -statement: control_statement -/* | expression_statement -- covered by declaration_statement */ - | compound_statement - | declaration_statement - | try_block { $$ = YACC_TRY_BLOCK_STATEMENT($1); } -control_statement: labeled_statement - | selection_statement - | iteration_statement - | jump_statement -labeled_statement: identifier_word ':' looping_statement { $$ = YACC_LABEL_STATEMENT($1, $3); } - | CASE constant_expression ':' looping_statement { $$ = YACC_CASE_STATEMENT($2, $4); } - | DEFAULT ':' looping_statement { $$ = YACC_DEFAULT_STATEMENT($3); } -/*expression_statement: expression.opt ';' -- covered by declaration_statement */ -compound_statement: '{' statement_seq.opt '}' { $$ = YACC_COMPOUND_STATEMENT($2); } - | '{' statement_seq.opt looping_statement '#' bang error '}' { $$ = $2; YACC_UNBANG($5, "Bad statement-seq."); } -statement_seq.opt: /* empty */ { $$ = YACC_STATEMENTS(0, 0); } - | statement_seq.opt looping_statement { $$ = YACC_STATEMENTS($1, YACC_COMPILE_STATEMENT($2)); } - | statement_seq.opt looping_statement '#' bang error ';' { $$ = $1; YACC_UNBANG($4, "Bad statement."); } -/* - * The dangling else conflict is resolved to the innermost if. - */ -selection_statement: IF '(' condition ')' looping_statement %prec SHIFT_THERE { $$ = YACC_IF_STATEMENT($3, $5, 0); } - | IF '(' condition ')' looping_statement ELSE looping_statement { $$ = YACC_IF_STATEMENT($3, $5, $7); } - | SWITCH '(' condition ')' looping_statement { $$ = YACC_SWITCH_STATEMENT($3, $5); } -condition.opt: /* empty */ { $$ = YACC_CONDITION(0); } - | condition -condition: parameter_declaration_list { $$ = YACC_CONDITION($1); } -/* | expression -- covered by parameter_declaration_list */ -/* | type_specifier_seq declarator '=' assignment_expression -- covered by parameter_declaration_list */ -iteration_statement: WHILE '(' condition ')' looping_statement { $$ = YACC_WHILE_STATEMENT($3, $5); } - | DO looping_statement WHILE '(' expression ')' ';' { $$ = YACC_DO_WHILE_STATEMENT($2, $5); } - | FOR '(' for_init_statement condition.opt ';' expression.opt ')' looping_statement - { $$ = YACC_FOR_STATEMENT($3, $4, $6, $8); } -for_init_statement: simple_declaration -/* | expression_statement -- covered by simple_declaration */ -jump_statement: BREAK ';' { $$ = YACC_BREAK_STATEMENT(); } - | CONTINUE ';' { $$ = YACC_CONTINUE_STATEMENT(); } - | RETURN expression.opt ';' { $$ = YACC_RETURN_STATEMENT($2); } - | GOTO identifier ';' { $$ = YACC_GOTO_STATEMENT($2); } -declaration_statement: block_declaration { $$ = YACC_DECLARATION_STATEMENT($1); } - -/*--------------------------------------------------------------------------------------------------- - * A.6 Declarations - *---------------------------------------------------------------------------------------------------*/ -compound_declaration: '{' nest declaration_seq.opt '}' { $$ = $3; unnest($2); } - | '{' nest declaration_seq.opt util looping_declaration '#' bang error '}' - { $$ = $3; unnest($2); YACC_UNBANG($7, "Bad declaration-seq."); } -declaration_seq.opt: /* empty */ { $$ = YACC_DECLARATIONS(0, 0); } - | declaration_seq.opt util looping_declaration { $$ = YACC_DECLARATIONS($1, YACC_COMPILE_DECLARATION($2, $3)); } - | declaration_seq.opt util looping_declaration '#' bang error ';' { $$ = $1; YACC_UNBANG($5, "Bad declaration."); } -looping_declaration: start_search1 looped_declaration { $$ = YACC_LINED_DECLARATION($2, $1); end_search($$); } -looped_declaration: declaration - | advance_search '+' looped_declaration { $$ = $3; } - | advance_search '-' { $$ = 0; } -declaration: block_declaration - | function_definition { $$ = YACC_SIMPLE_DECLARATION($1); } - | template_declaration -/* | explicit_instantiation -- covered by relevant declarations */ - | explicit_specialization - | specialised_declaration -specialised_declaration: linkage_specification { $$ = YACC_LINKAGE_SPECIFICATION($1); } - | namespace_definition { $$ = YACC_NAMESPACE_DECLARATION($1); } - | TEMPLATE specialised_declaration { $$ = YACC_SET_TEMPLATE_DECLARATION($2); } -block_declaration: simple_declaration { $$ = YACC_SIMPLE_DECLARATION($1); } - | specialised_block_declaration -specialised_block_declaration: asm_definition - | namespace_alias_definition - | using_declaration - | using_directive - | TEMPLATE specialised_block_declaration { $$ = YACC_SET_TEMPLATE_DECLARATION($2); } -simple_declaration: ';' { $$ = YACC_EXPRESSION(0); } - | init_declaration ';' - | init_declarations ';' { $$ = $1; } - | decl_specifier_prefix simple_declaration { $$ = YACC_DECL_SPECIFIER_EXPRESSION($2, $1); } - -/* A decl-specifier following a ptr_operator provokes a shift-reduce conflict for - * * const name - * which is resolved in favour of the pointer, and implemented by providing versions - * of decl-specifier guaranteed not to start with a cv_qualifier. - * - * decl-specifiers are implemented type-centrically. That is the semantic constraint - * that there must be a type is exploited to impose structure, but actually eliminate - * very little syntax. built-in types are multi-name and so need a different policy. - * - * non-type decl-specifiers are bound to the left-most type in a decl-specifier-seq, - * by parsing from the right and attaching suffixes to the right-hand type. Finally - * residual prefixes attach to the left. - */ -suffix_built_in_decl_specifier.raw: built_in_type_specifier { $$ = $1; } - | suffix_built_in_decl_specifier.raw built_in_type_specifier { $$ = YACC_BUILT_IN_NAME($1, $2); } - | suffix_built_in_decl_specifier.raw decl_specifier_suffix { $$ = YACC_DECL_SPECIFIER_NAME($1, $2); } -suffix_built_in_decl_specifier: suffix_built_in_decl_specifier.raw { $$ = $1; } - | TEMPLATE suffix_built_in_decl_specifier { $$ = YACC_SET_TEMPLATE_NAME($2); } -suffix_named_decl_specifier: scoped_id { $$ = $1; } - | elaborate_type_specifier { $$ = $1; } - | suffix_named_decl_specifier decl_specifier_suffix { $$ = YACC_DECL_SPECIFIER_NAME($1, $2); } -suffix_named_decl_specifier.bi: suffix_named_decl_specifier { $$ = YACC_NAME_EXPRESSION($1); } - | suffix_named_decl_specifier suffix_built_in_decl_specifier.raw { $$ = YACC_TYPED_NAME($1, $2); } -suffix_named_decl_specifiers: suffix_named_decl_specifier.bi - | suffix_named_decl_specifiers suffix_named_decl_specifier.bi { $$ = YACC_TYPED_NAME($1, $2); } -suffix_named_decl_specifiers.sf: scoped_special_function_id /* operators etc */ { $$ = YACC_NAME_EXPRESSION($1); } - | suffix_named_decl_specifiers - | suffix_named_decl_specifiers scoped_special_function_id { $$ = YACC_TYPED_NAME($1, $2); } -suffix_decl_specified_ids: suffix_built_in_decl_specifier - | suffix_built_in_decl_specifier suffix_named_decl_specifiers.sf { $$ = YACC_TYPED_NAME($1, $2); } - | suffix_named_decl_specifiers.sf -suffix_decl_specified_scope: suffix_named_decl_specifiers SCOPE - | suffix_built_in_decl_specifier suffix_named_decl_specifiers SCOPE { $$ = YACC_TYPED_NAME($1, $2); } - | suffix_built_in_decl_specifier SCOPE { $$ = YACC_NAME_EXPRESSION($1); } - -decl_specifier_affix: storage_class_specifier - | function_specifier - | FRIEND - | TYPEDEF - | cv_qualifier { $$ = $1; } - -decl_specifier_suffix: decl_specifier_affix - -decl_specifier_prefix: decl_specifier_affix - | TEMPLATE decl_specifier_prefix { $$ = YACC_SET_TEMPLATE_DECL_SPECIFIER($2); } - -storage_class_specifier: REGISTER | STATIC | MUTABLE - | EXTERN %prec SHIFT_THERE /* Prefer linkage specification */ - | AUTO - -function_specifier: EXPLICIT - | INLINE - | VIRTUAL - -type_specifier: simple_type_specifier - | elaborate_type_specifier - | cv_qualifier { $$ = YACC_CV_DECL_SPECIFIER($1); } - -elaborate_type_specifier: class_specifier - | enum_specifier - | elaborated_type_specifier - | TEMPLATE elaborate_type_specifier { $$ = YACC_SET_TEMPLATE_ID($2); } -simple_type_specifier: scoped_id - | built_in_type_specifier { $$ = YACC_BUILT_IN_ID_ID($1); } -built_in_type_specifier: CHAR | WCHAR_T | BOOL | SHORT | INT | LONG | SIGNED | UNSIGNED | FLOAT | DOUBLE | VOID - -/* - * The over-general use of declaration_expression to cover decl-specifier-seq.opt declarator in a function-definition means that - * class X {}; - * could be a function-definition or a class-specifier. - * enum X {}; - * could be a function-definition or an enum-specifier. - * The function-definition is not syntactically valid so resolving the false conflict in favour of the - * elaborated_type_specifier is correct. - */ -elaborated_type_specifier: elaborated_class_specifier - | elaborated_enum_specifier - | TYPENAME scoped_id { $$ = YACC_ELABORATED_TYPE_SPECIFIER($1, $2); } - -elaborated_enum_specifier: ENUM scoped_id %prec SHIFT_THERE { $$ = YACC_ELABORATED_TYPE_SPECIFIER($1, $2); } -enum_specifier: ENUM scoped_id enumerator_clause { $$ = YACC_ENUM_SPECIFIER_ID($2, $3); } - | ENUM enumerator_clause { $$ = YACC_ENUM_SPECIFIER_ID(0, $2); } -enumerator_clause: '{' enumerator_list_ecarb { $$ = YACC_ENUMERATORS(0, 0); } - | '{' enumerator_list enumerator_list_ecarb { $$ = $2; } - | '{' enumerator_list ',' enumerator_definition_ecarb { $$ = $2; } -enumerator_list_ecarb: '}' { } - | bang error '}' { YACC_UNBANG($1, "Bad enumerator-list."); } -enumerator_definition_ecarb: '}' { } - | bang error '}' { YACC_UNBANG($1, "Bad enumerator-definition."); } -enumerator_definition_filler: /* empty */ - | bang error ',' { YACC_UNBANG($1, "Bad enumerator-definition."); } -enumerator_list_head: enumerator_definition_filler { $$ = YACC_ENUMERATORS(0, 0); } - | enumerator_list ',' enumerator_definition_filler -enumerator_list: enumerator_list_head enumerator_definition { $$ = YACC_ENUMERATORS($1, $2); } -enumerator_definition: enumerator { $$ = YACC_ENUMERATOR($1, 0); } - | enumerator '=' constant_expression { $$ = YACC_ENUMERATOR($1, $3); } -enumerator: identifier - -namespace_definition: NAMESPACE scoped_id compound_declaration { $$ = YACC_NAMESPACE_DEFINITION($2, $3); } - | NAMESPACE compound_declaration { $$ = YACC_NAMESPACE_DEFINITION(0, $2); } -namespace_alias_definition: NAMESPACE scoped_id '=' scoped_id ';' { $$ = YACC_NAMESPACE_ALIAS_DEFINITION($2, $4); } - -using_declaration: USING declarator_id ';' { $$ = YACC_USING_DECLARATION(false, $2); } - | USING TYPENAME declarator_id ';' { $$ = YACC_USING_DECLARATION(true, $3); } - -using_directive: USING NAMESPACE scoped_id ';' { $$ = YACC_USING_DIRECTIVE($3); } -asm_definition: ASM '(' string ')' ';' { $$ = YACC_ASM_DEFINITION($3); } -linkage_specification: EXTERN string looping_declaration { $$ = YACC_LINKAGE_SPECIFIER($2, $3); } - | EXTERN string compound_declaration { $$ = YACC_LINKAGE_SPECIFIER($2, $3); } - -/*--------------------------------------------------------------------------------------------------- - * A.7 Declarators - *---------------------------------------------------------------------------------------------------*/ -/*init-declarator is named init_declaration to reflect the embedded decl-specifier-seq.opt*/ -init_declarations: assignment_expression ',' init_declaration { $$ = YACC_EXPRESSIONS(YACC_EXPRESSIONS(0, $1), $3); } - | init_declarations ',' init_declaration { $$ = YACC_EXPRESSIONS($1, $3); } -init_declaration: assignment_expression -/* | assignment_expression '=' initializer_clause -- covered by assignment_expression */ -/* | assignment_expression '(' expression_list ')' -- covered by another set of call arguments */ - -/*declarator: -- covered by assignment_expression */ -/*direct_declarator: -- covered by postfix_expression */ - -star_ptr_operator: '*' { $$ = YACC_POINTER_DECLARATOR(); } - | star_ptr_operator cv_qualifier { $$ = YACC_CV_DECLARATOR($1, $2); } -nested_ptr_operator: star_ptr_operator { $$ = $1; } - | id_scope nested_ptr_operator { $$ = YACC_NESTED_DECLARATOR($1, $2); } -ptr_operator: '&' { $$ = YACC_REFERENCE_DECLARATOR(); } - | nested_ptr_operator { $$ = $1; } - | global_scope nested_ptr_operator { $$ = YACC_GLOBAL_DECLARATOR($1, $2); } -ptr_operator_seq: ptr_operator { $$ = YACC_POINTER_EXPRESSION($1, YACC_EPSILON()); } - | ptr_operator ptr_operator_seq { $$ = YACC_POINTER_EXPRESSION($1, $2); } -/* Independently coded to localise the shift-reduce conflict: sharing just needs another %prec */ -ptr_operator_seq.opt: /* empty */ %prec SHIFT_THERE /* Maximise type length */ { $$ = YACC_EXPRESSION(0); } - | ptr_operator ptr_operator_seq.opt { $$ = YACC_POINTER_EXPRESSION($1, $2); } - -cv_qualifier_seq.opt: /* empty */ { $$ = YACC_CV_QUALIFIERS(0, 0); } - | cv_qualifier_seq.opt cv_qualifier { $$ = YACC_CV_QUALIFIERS($1, $2); } -cv_qualifier: CONST | VOLATILE /* | CvQualifier */ - -/*type_id -- also covered by parameter declaration */ -type_id: type_specifier abstract_declarator.opt { $$ = YACC_TYPED_EXPRESSION($1, $2); } - | type_specifier type_id { $$ = YACC_TYPED_EXPRESSION($1, $2); } - -/*abstract_declarator: -- also covered by parameter declaration */ -abstract_declarator.opt: /* empty */ { $$ = YACC_EPSILON(); } - | ptr_operator abstract_declarator.opt { $$ = YACC_POINTER_EXPRESSION($1, $2); } - | direct_abstract_declarator -direct_abstract_declarator.opt: /* empty */ { $$ = YACC_EPSILON(); } - | direct_abstract_declarator -direct_abstract_declarator: direct_abstract_declarator.opt parenthesis_clause { $$ = YACC_CALL_EXPRESSION($1, $2); } - | direct_abstract_declarator.opt '[' ']' { $$ = YACC_ARRAY_EXPRESSION($1, 0); } - | direct_abstract_declarator.opt '[' constant_expression ']' { $$ = YACC_ARRAY_EXPRESSION($1, $3); } -/* | '(' abstract_declarator ')' -- covered by parenthesis_clause */ - -parenthesis_clause: parameters_clause cv_qualifier_seq.opt { $$ = YACC_PARENTHESISED($1, $2, 0); } - | parameters_clause cv_qualifier_seq.opt exception_specification { $$ = YACC_PARENTHESISED($1, $2, $3); } -parameters_clause: '(' parameter_declaration_clause ')' { $$ = $2; } -/* parameter_declaration_clause also covers init_declaration, type_id, declarator and abstract_declarator. */ -parameter_declaration_clause: /* empty */ { $$ = YACC_PARAMETERS(0, 0); } - | parameter_declaration_list - | parameter_declaration_list ELLIPSIS { $$ = YACC_PARAMETERS($1, YACC_ELLIPSIS_EXPRESSION()); } -parameter_declaration_list: parameter_declaration { $$ = YACC_PARAMETERS(0, $1); } - | parameter_declaration_list ',' parameter_declaration { $$ = YACC_PARAMETERS($1, $3); } - -/* A typed abstract qualifier such as - * Class * ... - * looks like a multiply, so pointers are parsed as their binary operation equivalents that - * ultimately terminate with a degenerate right hand term. - */ -abstract_pointer_declaration: ptr_operator_seq - | multiplicative_expression star_ptr_operator ptr_operator_seq.opt { $$ = YACC_MULTIPLY_EXPRESSION($1, $2, $3); } -abstract_parameter_declaration: abstract_pointer_declaration - | and_expression '&' { $$ = YACC_AND_EXPRESSION($1, YACC_EPSILON()); } - | and_expression '&' abstract_pointer_declaration { $$ = YACC_AND_EXPRESSION($1, $3); } -special_parameter_declaration: abstract_parameter_declaration - | abstract_parameter_declaration '=' assignment_expression { $$ = YACC_ASSIGNMENT_EXPRESSION($1, $2, $3); } - | ELLIPSIS { $$ = YACC_ELLIPSIS_EXPRESSION(); } -parameter_declaration: assignment_expression { $$ = YACC_EXPRESSION_PARAMETER($1); } - | special_parameter_declaration { $$ = YACC_EXPRESSION_PARAMETER($1); } - | decl_specifier_prefix parameter_declaration { $$ = YACC_DECL_SPECIFIER_PARAMETER($2, $1); } - -/* The grammar is repeated for use within template <> - */ -templated_parameter_declaration: templated_assignment_expression { $$ = YACC_EXPRESSION_PARAMETER($1); } - | templated_abstract_declaration { $$ = YACC_EXPRESSION_PARAMETER($1); } - | templated_abstract_declaration '=' templated_assignment_expression - { $$ = YACC_EXPRESSION_PARAMETER(YACC_ASSIGNMENT_EXPRESSION($1, $2, $3)); } - | decl_specifier_prefix templated_parameter_declaration { $$ = YACC_DECL_SPECIFIER_PARAMETER($2, $1); } -templated_abstract_declaration: abstract_pointer_declaration - | templated_and_expression '&' { $$ = YACC_AND_EXPRESSION($1, 0); } - | templated_and_expression '&' abstract_pointer_declaration { $$ = YACC_AND_EXPRESSION($1, $3); } - -/* function_definition includes constructor, destructor, implicit int definitions too. - * A local destructor is successfully parsed as a function-declaration but the ~ was treated as a unary operator. - * constructor_head is the prefix ambiguity between a constructor and a member-init-list starting with a bit-field. - */ -function_definition: ctor_definition - | func_definition -func_definition: assignment_expression function_try_block { $$ = YACC_FUNCTION_DEFINITION($1, $2); } - | assignment_expression function_body { $$ = YACC_FUNCTION_DEFINITION($1, $2); } - | decl_specifier_prefix func_definition { $$ = YACC_DECL_SPECIFIER_EXPRESSION($2, $1); } -ctor_definition: constructor_head function_try_block { $$ = YACC_CTOR_DEFINITION($1, $2); } - | constructor_head function_body { $$ = YACC_CTOR_DEFINITION($1, $2); } - | decl_specifier_prefix ctor_definition { $$ = YACC_DECL_SPECIFIER_EXPRESSION($2, $1); } -constructor_head: bit_field_init_declaration { $$ = YACC_EXPRESSIONS(0, $1); } - | constructor_head ',' assignment_expression { $$ = YACC_EXPRESSIONS($1, $3); } -function_try_block: TRY function_block handler_seq { $$ = YACC_TRY_FUNCTION_BLOCK($2, $3); } -function_block: ctor_initializer.opt function_body { $$ = YACC_CTOR_FUNCTION_BLOCK($2, $1); } -function_body: compound_statement { $$ = YACC_FUNCTION_BLOCK($1); } - -/* An = initializer looks like an extended assignment_expression. - * An () initializer looks like a function call. - * initializer is therefore flattened into its generalised customers. - *initializer: '=' initializer_clause -- flattened into caller - * | '(' expression_list ')' -- flattened into caller */ -initializer_clause: assignment_expression { $$ = YACC_INITIALIZER_EXPRESSION_CLAUSE($1); } - | braced_initializer -braced_initializer: '{' initializer_list '}' { $$ = YACC_INITIALIZER_LIST_CLAUSE($2); } - | '{' initializer_list ',' '}' { $$ = YACC_INITIALIZER_LIST_CLAUSE($2); } - | '{' '}' { $$ = YACC_INITIALIZER_LIST_CLAUSE(0); } - | '{' looping_initializer_clause '#' bang error '}' { $$ = 0; YACC_UNBANG($4, "Bad initializer_clause."); } - | '{' initializer_list ',' looping_initializer_clause '#' bang error '}' - { $$ = $2; YACC_UNBANG($6, "Bad initializer_clause."); } -initializer_list: looping_initializer_clause { $$ = YACC_INITIALIZER_CLAUSES(0, $1); } - | initializer_list ',' looping_initializer_clause { $$ = YACC_INITIALIZER_CLAUSES($1, $3); } -looping_initializer_clause: start_search looped_initializer_clause { $$ = $2; end_search($$); } -looped_initializer_clause: initializer_clause - | advance_search '+' looped_initializer_clause { $$ = $3; } - | advance_search '-' { $$ = 0; } - -/*--------------------------------------------------------------------------------------------------- - * A.8 Classes - *--------------------------------------------------------------------------------------------------- - * - * An anonymous bit-field declaration may look very like inheritance: - * class A : B = 3; - * class A : B ; - * The two usages are too distant to try to create and enforce a common prefix so we have to resort to - * a parser hack by backtracking. Inheritance is much the most likely so we mark the input stream context - * and try to parse a base-clause. If we successfully reach a { the base-clause is ok and inheritance was - * the correct choice so we unmark and continue. If we fail to find the { an error token causes back-tracking - * to the alternative parse in elaborated_class_specifier which regenerates the : and declares unconditional success. - */ -colon_mark: ':' { $$ = mark(); } -elaborated_class_specifier: class_key scoped_id %prec SHIFT_THERE { $$ = YACC_ELABORATED_TYPE_SPECIFIER($1, $2); } - | class_key scoped_id colon_mark error { $$ = YACC_ELABORATED_TYPE_SPECIFIER($1, $2); rewind_colon($3, $$); } -class_specifier_head: class_key scoped_id colon_mark base_specifier_list '{' { unmark($4); $$ = YACC_CLASS_SPECIFIER_ID($1, $2, $4); } - | class_key ':' base_specifier_list '{' { $$ = YACC_CLASS_SPECIFIER_ID($1, 0, $3); } - | class_key scoped_id '{' { $$ = YACC_CLASS_SPECIFIER_ID($1, $2, 0); } - | class_key '{' { $$ = YACC_CLASS_SPECIFIER_ID($1, 0, 0); } -class_key: CLASS | STRUCT | UNION -class_specifier: class_specifier_head member_specification.opt '}' { $$ = YACC_CLASS_MEMBERS($1, $2); } - | class_specifier_head member_specification.opt util looping_member_declaration '#' bang error '}' - { $$ = YACC_CLASS_MEMBERS($1, $2); YACC_UNBANG($6, "Bad member_specification.opt."); } -member_specification.opt: /* empty */ { $$ = YACC_MEMBER_DECLARATIONS(0, 0); } - | member_specification.opt util looping_member_declaration { $$ = YACC_MEMBER_DECLARATIONS($1, YACC_COMPILE_DECLARATION($2, $3)); } - | member_specification.opt util looping_member_declaration '#' bang error ';' - { $$ = $1; YACC_UNBANG($5, "Bad member-declaration."); } -looping_member_declaration: start_search looped_member_declaration { $$ = YACC_LINED_DECLARATION($2, $1); end_search($$); } -looped_member_declaration: member_declaration - | advance_search '+' looped_member_declaration { $$ = $3; } - | advance_search '-' { $$ = 0; } -member_declaration: accessibility_specifier - | simple_member_declaration { $$ = YACC_SIMPLE_DECLARATION($1); } - | function_definition { $$ = YACC_SIMPLE_DECLARATION($1); } -/* | function_definition ';' -- trailing ; covered by null declaration */ -/* | qualified_id ';' -- covered by simple_member_declaration */ - | using_declaration - | template_declaration - -/* The generality of constructor names (there need be no parenthesised argument list) means that that - * name : f(g), h(i) - * could be the start of a constructor or the start of an anonymous bit-field. An ambiguity is avoided by - * parsing the ctor-initializer of a function_definition as a bit-field. - */ -simple_member_declaration: ';' { $$ = YACC_EXPRESSION(0); } - | assignment_expression ';' - | constructor_head ';' { $$ = $1; } - | member_init_declarations ';' { $$ = $1; } - | decl_specifier_prefix simple_member_declaration { $$ = YACC_DECL_SPECIFIER_EXPRESSION($2, $1); } -member_init_declarations: assignment_expression ',' member_init_declaration { $$ = YACC_EXPRESSIONS(YACC_EXPRESSIONS(0, $1), $3); } - | constructor_head ',' bit_field_init_declaration { $$ = YACC_EXPRESSIONS($1, $3); } - | member_init_declarations ',' member_init_declaration { $$ = YACC_EXPRESSIONS($1, $3); } -member_init_declaration: assignment_expression -/* | assignment_expression '=' initializer_clause -- covered by assignment_expression */ -/* | assignment_expression '(' expression_list ')' -- covered by another set of call arguments */ - | bit_field_init_declaration -accessibility_specifier: access_specifier ':' { $$ = YACC_ACCESSIBILITY_SPECIFIER($1); } -bit_field_declaration: assignment_expression ':' bit_field_width { $$ = YACC_BIT_FIELD_EXPRESSION($1, $3); } - | ':' bit_field_width { $$ = YACC_BIT_FIELD_EXPRESSION(0, $2); } -bit_field_width: logical_or_expression -/* | logical_or_expression '?' expression ':' assignment_expression -- has SR conflict w.r.t later = */ - | logical_or_expression '?' bit_field_width ':' bit_field_width { $$ = YACC_CONDITIONAL_EXPRESSION($1, $3, $5); } -bit_field_init_declaration: bit_field_declaration - | bit_field_declaration '=' initializer_clause { $$ = YACC_ASSIGNMENT_EXPRESSION($1, $2, $3); } - -/*--------------------------------------------------------------------------------------------------- - * A.9 Derived classes - *---------------------------------------------------------------------------------------------------*/ -/*base_clause: ':' base_specifier_list -- flattened */ -base_specifier_list: base_specifier { $$ = YACC_BASE_SPECIFIERS(0, $1); } - | base_specifier_list ',' base_specifier { $$ = YACC_BASE_SPECIFIERS($1, $3); } -base_specifier: scoped_id { $$ = YACC_BASE_SPECIFIER($1); } - | access_specifier base_specifier { $$ = YACC_ACCESS_BASE_SPECIFIER($2, $1); } - | VIRTUAL base_specifier { $$ = YACC_VIRTUAL_BASE_SPECIFIER($2); } -access_specifier: PRIVATE | PROTECTED | PUBLIC - -/*--------------------------------------------------------------------------------------------------- - * A.10 Special member functions - *---------------------------------------------------------------------------------------------------*/ -conversion_function_id: OPERATOR conversion_type_id { $$ = YACC_CONVERSION_FUNCTION_ID($2); } -conversion_type_id: type_specifier ptr_operator_seq.opt { $$ = YACC_TYPED_EXPRESSION($1, $2); } - | type_specifier conversion_type_id { $$ = YACC_TYPED_EXPRESSION($1, $2); } -/* - * Ctor-initialisers can look like a bit field declaration, given the generalisation of names: - * Class(Type) : m1(1), m2(2) {} - * NonClass(bit_field) : int(2), second_variable, ... - * The grammar below is used within a function_try_block or function_definition. - * See simple_member_declaration for use in normal member function_definition. - */ -ctor_initializer.opt: /* empty */ { $$ = YACC_MEM_INITIALIZERS(0, 0); } - | ctor_initializer -ctor_initializer: ':' mem_initializer_list { $$ = $2; } - | ':' mem_initializer_list bang error { $$ = $2; YACC_UNBANG($3, "Bad ctor-initializer."); } -mem_initializer_list: mem_initializer { $$ = YACC_MEM_INITIALIZERS(0, $1); } - | mem_initializer_list_head mem_initializer { $$ = YACC_MEM_INITIALIZERS($1, $2); } -mem_initializer_list_head: mem_initializer_list ',' - | mem_initializer_list bang error ',' { YACC_UNBANG($2, "Bad mem-initializer."); } -mem_initializer: mem_initializer_id '(' expression_list.opt ')' { $$ = YACC_MEM_INITIALIZER($1, $3); } -mem_initializer_id: scoped_id - -/*--------------------------------------------------------------------------------------------------- - * A.11 Overloading - *---------------------------------------------------------------------------------------------------*/ -operator_function_id: OPERATOR operator { $$ = YACC_OPERATOR_FUNCTION_ID($2); } -/* - * It is not clear from the ANSI standard whether spaces are permitted in delete[]. If not then it can - * be recognised and returned as DELETE_ARRAY by the lexer. Assuming spaces are permitted there is an - * ambiguity created by the over generalised nature of expressions. operator new is a valid delarator-id - * which we may have an undimensioned array of. Semantic rubbish, but syntactically valid. Since the - * array form is covered by the declarator consideration we can exclude the operator here. The need - * for a semantic rescue can be eliminated at the expense of a couple of shift-reduce conflicts by - * removing the comments on the next four lines. - */ -operator: /*++++*/ NEW { $$ = YACC_OPERATOR_NEW_ID(); } - | /*++++*/ DELETE { $$ = YACC_OPERATOR_DELETE_ID(); } -/* | / ---- / NEW %prec SHIFT_THERE { $$ = YACC_OPERATOR_NEW_ID(); } -/* | / ---- / DELETE %prec SHIFT_THERE { $$ = YACC_OPERATOR_DELETE_ID(); } -/* | / ---- / NEW '[' ']' -- Covered by array of OPERATOR NEW */ -/* | / ---- / DELETE '[' ']' -- Covered by array of OPERATOR DELETE */ - | '+' { $$ = YACC_OPERATOR_ADD_ID(); } - | '-' { $$ = YACC_OPERATOR_SUB_ID(); } - | '*' { $$ = YACC_OPERATOR_MUL_ID(); } - | '/' { $$ = YACC_OPERATOR_DIV_ID(); } - | '%' { $$ = YACC_OPERATOR_MOD_ID(); } - | '^' { $$ = YACC_OPERATOR_XOR_ID(); } - | '&' { $$ = YACC_OPERATOR_BIT_AND_ID(); } - | '|' { $$ = YACC_OPERATOR_BIT_OR_ID(); } - | '~' { $$ = YACC_OPERATOR_BIT_NOT_ID(); } - | '!' { $$ = YACC_OPERATOR_LOG_NOT_ID(); } - | '=' { $$ = YACC_OPERATOR_ASS_ID(); } - | '<' { $$ = YACC_OPERATOR_LT_ID(); } - | '>' { $$ = YACC_OPERATOR_GT_ID(); } - | ASS_ADD { $$ = YACC_OPERATOR_ASS_ADD_ID(); } - | ASS_SUB { $$ = YACC_OPERATOR_ASS_SUB_ID(); } - | ASS_MUL { $$ = YACC_OPERATOR_ASS_MUL_ID(); } - | ASS_DIV { $$ = YACC_OPERATOR_ASS_DIV_ID(); } - | ASS_MOD { $$ = YACC_OPERATOR_ASS_MOD_ID(); } - | ASS_XOR { $$ = YACC_OPERATOR_ASS_XOR_ID(); } - | ASS_AND { $$ = YACC_OPERATOR_ASS_BIT_AND_ID(); } - | ASS_OR { $$ = YACC_OPERATOR_ASS_BIT_OR_ID(); } - | SHL { $$ = YACC_OPERATOR_SHL_ID(); } - | SHR { $$ = YACC_OPERATOR_SHR_ID(); } - | ASS_SHR { $$ = YACC_OPERATOR_ASS_SHR_ID(); } - | ASS_SHL { $$ = YACC_OPERATOR_ASS_SHL_ID(); } - | EQ { $$ = YACC_OPERATOR_EQ_ID(); } - | NE { $$ = YACC_OPERATOR_NE_ID(); } - | LE { $$ = YACC_OPERATOR_LE_ID(); } - | GE { $$ = YACC_OPERATOR_GE_ID(); } - | LOG_AND { $$ = YACC_OPERATOR_LOG_AND_ID(); } - | LOG_OR { $$ = YACC_OPERATOR_LOG_OR_ID(); } - | INC { $$ = YACC_OPERATOR_INC_ID(); } - | DEC { $$ = YACC_OPERATOR_DEC_ID(); } - | ',' { $$ = YACC_OPERATOR_COMMA_ID(); } - | ARROW_STAR { $$ = YACC_OPERATOR_ARROW_STAR_ID(); } - | ARROW { $$ = YACC_OPERATOR_ARROW_ID(); } - | '(' ')' { $$ = YACC_OPERATOR_CALL_ID(); } - | '[' ']' { $$ = YACC_OPERATOR_INDEX_ID(); } - -/*--------------------------------------------------------------------------------------------------- - * A.12 Templates - *---------------------------------------------------------------------------------------------------*/ -template_declaration: template_parameter_clause declaration { $$ = YACC_TEMPLATE_DECLARATION($1, $2); } - | EXPORT template_declaration { $$ = YACC_DECL_SPECIFIER_DECLARATION($2, $1); } -template_parameter_clause: TEMPLATE '<' template_parameter_list '>' { $$ = $3; } -template_parameter_list: template_parameter { $$ = YACC_TEMPLATE_PARAMETERS(0, $1); } - | template_parameter_list ',' template_parameter { $$ = YACC_TEMPLATE_PARAMETERS($1, $3); } -template_parameter: simple_type_parameter { $$ = YACC_INIT_SIMPLE_TYPE_PARAMETER($1, 0); } - | simple_type_parameter '=' type_id { $$ = YACC_INIT_SIMPLE_TYPE_PARAMETER($1, $3); } - | templated_type_parameter { $$ = YACC_INIT_TEMPLATED_PARAMETER($1, 0); } - | templated_type_parameter '=' identifier { $$ = YACC_INIT_TEMPLATED_PARAMETER($1, $3); } - | templated_parameter_declaration { $$ = YACC_TEMPLATE_PARAMETER($1); } - | bang error { $$ = 0; YACC_UNBANG($1, "Bad template-parameter."); } -simple_type_parameter: CLASS { $$ = YACC_CLASS_TYPE_PARAMETER(0); } -/* | CLASS identifier -- covered by parameter_declaration */ - | TYPENAME { $$ = YACC_TYPENAME_TYPE_PARAMETER(0); } -/* | TYPENAME identifier -- covered by parameter_declaration */ -templated_type_parameter: template_parameter_clause CLASS { $$ = YACC_TEMPLATED_TYPE_PARAMETER($1, 0); } - | template_parameter_clause CLASS identifier { $$ = YACC_TEMPLATED_TYPE_PARAMETER($1, $3); } -template_id: TEMPLATE identifier '<' template_argument_list '>' { $$ = YACC_TEMPLATE_NAME($2, $4); } - | TEMPLATE template_id { $$ = $2; } -/* - * template-argument is evaluated using a templated...expression so that > resolves to end of template. - */ -template_argument_list: template_argument { $$ = YACC_TEMPLATE_ARGUMENTS(0, $1); } - | template_argument_list ',' template_argument { $$ = YACC_TEMPLATE_ARGUMENTS($1, $3); } -template_argument: templated_parameter_declaration { $$ = YACC_TEMPLATE_ARGUMENT($1); } -/* | type_id -- covered by templated_parameter_declaration */ -/* | template_name -- covered by templated_parameter_declaration */ -/* | error -- must allow template failure to re-search */ - -/* - * Generalised naming makes identifier a valid declaration, so TEMPLATE identifier is too. - * The TEMPLATE prefix is therefore folded into all names, parenthesis_clause and decl_specifier_prefix. - */ -/*explicit_instantiation: TEMPLATE declaration */ -explicit_specialization: TEMPLATE '<' '>' declaration { $$ = YACC_EXPLICIT_SPECIALIZATION($4); } - -/*--------------------------------------------------------------------------------------------------- - * A.13 Exception Handling - *---------------------------------------------------------------------------------------------------*/ -try_block: TRY compound_statement handler_seq { $$ = YACC_TRY_BLOCK($2, $3); } -/*function_try_block: -- moved near function_block */ -handler_seq: handler { $$ = YACC_HANDLERS(0, $1); } - | handler handler_seq { $$ = YACC_HANDLERS($2, $1); } -handler: CATCH '(' exception_declaration ')' compound_statement { $$ = YACC_HANDLER($3, $5); } -exception_declaration: parameter_declaration { $$ = YACC_EXCEPTION_DECLARATION($1); } -/* ELLIPSIS -- covered by parameter_declaration */ -throw_expression: THROW { $$ = YACC_THROW_EXPRESSION(0); } - | THROW assignment_expression { $$ = YACC_THROW_EXPRESSION($2); } -templated_throw_expression: THROW { $$ = YACC_THROW_EXPRESSION(0); } - | THROW templated_assignment_expression { $$ = YACC_THROW_EXPRESSION($2); } -exception_specification: THROW '(' ')' { $$ = YACC_EXCEPTION_SPECIFICATION(0); } - | THROW '(' type_id_list ')' { $$ = YACC_EXCEPTION_SPECIFICATION($3); } -type_id_list: type_id { $$ = YACC_EXPRESSIONS(0, $1); } - | type_id_list ',' type_id { $$ = YACC_EXPRESSIONS($1, $3); } - -/*--------------------------------------------------------------------------------------------------- - * Back-tracking and context support - *---------------------------------------------------------------------------------------------------*/ -advance_search: error { yyerrok; advance_search(); } /* Rewind and queue '+' or '-' '#' */ -bang: /* empty */ { $$ = YACC_BANG(); } /* set flag to suppress "parse error" */ -mark: /* empty */ { $$ = mark(); } /* Push lookahead and input token stream context onto a stack */ -nest: /* empty */ { $$ = nest(); } /* Push a declaration nesting depth onto the parse stack */ -start_search: /* empty */ { $$ = YACC_LINE(); start_search(false); } /* Create/reset binary search context */ -start_search1: /* empty */ { $$ = YACC_LINE(); start_search(true); } /* Create/reset binary search context */ -util: /* empty */ { $$ = YACC_UTILITY_MODE(); } /* Get current utility mode */ -/*StartTester*/ -%% -#include -/*EndTester*/