1029 C语言文法

program ->

external_declaration

| program external_declaration

<程序> -> <外部声明> | <程序> <外部声明>

external_declaration -> function_definition

| declaration

<外部声明> -> <函数定义> | <声明>

function_definition -> type_specifier declarator compound_statement

<函数定义> -> <说明符类型> <声明> <复合语句>

type_specifier ->

VOID

| CHAR

| INT

| FLOAT

<说明符类型> -> <空类> | <字符型> | <浮点型>

declarator

pointer direct_declarator

| direct_declarator

<声明> -> <指针> <直接说明符> | <直接说明符>

Pointerà

'*'

| '*' pointer

<指针> -> <*> | <*指针>

direct_declarator

IDENTIFIER

|direct_declarator’[‘ ‘]’

|direct_declarator ’[’ constant_expression ’]’

| IDENTIFIER '(' parameter_list ')'

| IDENTIFIER '(' ')'

|direct_declarator ‘,’ identifier_list

identifier_list

: IDENTIFIER

| identifier_list ',' IDENTIFIER

<识别名单> -> <标识符> | <识别名单 ';' 标识符>

constant_expressionà

conditional_expression

<恒表达式> -> <恒表达式>

parameter_list à

parameter_declaration

| parameter_list ',' parameter_declaration

<参数名单> -> <参数声明> | <参数名单 ';' 参数声明>

parameter_declaration à

declaration_specifiers IDENTIFIER

<参数声明>-><'说明符' '声明' '标识符'>

compound_statement à

'{' '}'

| '{' statement_list '}'

| '{' declaration_list statement_list '}'

<复合语句>-> <'{' '}'> | <'{'语句列表'}'> | <'{'声明' '语句列表' '}'>

declaration_list à

declaration

| declaration_list declaration

<声明_列表> -> <识别符> | <识别名单识别符>

Declarationà

init_declarator

| init_declarator_list ',' init_declarator

<识别符> -> <初始化标别符> |<初始化标识符 ',' 初始化标识符>

init_declarator à

declarator

| declarator '=' initializer

<初始化标识符> -> <标识符> | <标识符 '=' 初始化器>

Initializer à

assignment_expression

| '{' initializer_list '}'

| '{' initializer_list ',' '}'

<初始化器> -> <赋值表达式> | <'{' 初始化列表 '}'> | <'{' 初始化列表 ',' '}'>

initializer_list à

initializer

| initializer_list ',' initializer

<初始化列表> -> <初始化>| <初始化列表 ',' 初始化器>

statement_listà

statement

| statement_list statement

<语句表> -> <语句> | <语句表语句>

Statement à

| compound_statement

| expression_statement

| selection_statement

| iteration_statement

| jump_statement

expression_statement à

';'

| expression ';'

<表达式语句> -> <';'> |<表达式 ';'>

selection_statement

: IF '(' expression ')' statement

| IF '(' expression ')' statement ELSE statement

<选择语句> ：IF< '(' 表达式 ')' 语句> | IF <'(' 表达式 ')' 语句 ELSE 语句 >

iteration_statementà

WHILE '(' expression ')' statement

| FOR '(' expression_statement expression_statement ')' statement

| FOR '(' expression_statement expression_statement expression ')' statement

<迭代语句> -> WHILE< '(' 表达式 ')' 语句 >| FOR '(' 表达语句表达语句 ')' 语句 | FOR '(' 表达语句表达语句表达式 ')' 语句

jump_statement

| CONTINUE ';'

| BREAK ';'

| RETURN ';'

| RETURN expression ';'

expression

: assignment_expression

| expression ',' assignment_expression

assignment_expression à

conditional_expression

| unary_expression assignment_operator assignment_expression

conditional_expression à

logical_or_expression

| logical_or_expression '?' expression ':' conditional_expression

logical_or_expression à

logical_and_expression

| logical_or_expression OR_OP logical_and_expression

logical_and_expression

: inclusive_or_expression

| logical_and_expression AND_OP inclusive_or_expression

inclusive_or_expressionà

exclusive_or_expression

| inclusive_or_expression '|' exclusive_or_expression

exclusive_or_expression

: and_expression

| exclusive_or_expression '^' and_expression

and_expression

: equality_expression

| and_expression '&' equality_expression

equality_expression

: relational_expression

| equality_expression EQ_OP relational_expression

| equality_expression NE_OP relational_expression

relational_expression

: shift_expression

| relational_expression '<' shift_expression

| relational_expression '>' shift_expression

| relational_expression LE_OP shift_expression

| relational_expression GE_OP shift_expression

shift_expression

: additive_expression

| shift_expression LEFT_OP additive_expression

| shift_expression RIGHT_OP additive_expression

additive_expression

: multiplicative_expression

| additive_expression '+' multiplicative_expression

| additive_expression '-' multiplicative_expression

multiplicative_expression

: cast_expression

| multiplicative_expression '*' cast_expression

| multiplicative_expression '/' cast_expression

| multiplicative_expression '%' cast_expression

cast_expression

: unary_expression

| '(' type_name ')' cast_expression

unary_expression

: postfix_expression

| INC_OP unary_expression

| DEC_OP unary_expression

| unary_operator cast_expression

| SIZEOF unary_expression

| SIZEOF '(' type_name ')'

postfix_expression à

: primary_expression

| postfix_expression '[' expression ']'

| postfix_expression '(' ')'

| postfix_expression '(' argument_expression_list ')'

| postfix_expression '.' IDENTIFIER

| postfix_expression PTR_OP IDENTIFIER

| postfix_expression INC_OP

| postfix_expression DEC_OP

primary_expression à

IDENTIFIER

| CONSTANT

| STRING_LITERAL

| '(' expression ')'

argument_expression_list

: assignment_expression

| argument_expression_list ',' assignment_expression

unary_operator

: '&'

| '*'

| '+'

| '-'

| '~'

| '!'

assignment_operator à

'='

| MUL_ASSIGN

| DIV_ASSIGN

| MOD_ASSIGN

| ADD_ASSIGN

| SUB_ASSIGN

| LEFT_ASSIGN

| RIGHT_ASSIGN

| AND_ASSIGN

| XOR_ASSIGN

| OR_ASSIGN

storage_class_specifier à

TYPEDEF

| EXTERN

| STATIC

| AUTO

| REGISTER

struct_or_union_specifier

: struct_or_union IDENTIFIER '{' struct_declaration_list '}'

| struct_or_union '{' struct_declaration_list '}'

| struct_or_union IDENTIFIER

struct_or_union

: STRUCT

| UNION

struct_declaration_list

: struct_declaration

| struct_declaration_list struct_declaration

struct_declaration

: specifier_qualifier_list struct_declarator_list ';'

specifier_qualifier_list à

type_specifier specifier_qualifier_list

| type_specifier

| type_qualifier specifier_qualifier_list

| type_qualifier

struct_declarator_list à

struct_declarator

| struct_declarator_list ',' struct_declarator

struct_declarator à

: declarator

| ':' constant_expression

| declarator ':' constant_expression

enum_specifier à

ENUM '{' enumerator_list '}'

| ENUM IDENTIFIER '{' enumerator_list '}'

| ENUM IDENTIFIER

enumerator_list à

enumerator

| enumerator_list ',' enumerator

Enumerator à

IDENTIFIER

| IDENTIFIER '=' constant_expression

type_qualifier à

CONST

| VOLATILE

type_qualifier_list à

type_qualifier

| type_qualifier_list type_qualifier

parameter_type_list à

parameter_list

| parameter_list ',' ELLIPSIS

parameter_list à

: parameter_declaration

| parameter_list ',' parameter_declaration

type_name à

specifier_qualifier_list

| specifier_qualifier_list abstract_declarator

abstract_declarator à

pointer

| direct_abstract_declarator

| pointer direct_abstract_declarator

direct_abstract_declarator à

'(' abstract_declarator ')'

| '[' ']'

| '[' constant_expression ']'

| direct_abstract_declarator '[' ']'

| direct_abstract_declarator '[' constant_expression ']'

| '(' ')'

| '(' parameter_type_list ')'

| direct_abstract_declarator '(' ')'

| direct_abstract_declarator '(' parameter_type_list ')'

labeled_statement à

IDENTIFIER ':' statement

| CASE constant_expression ':' statement

| DEFAULT ':' statement