Top level
program: (declaration | function-definition)+
declaration: 'typedef' type-specifier declarators ';'
| type-specifier init-declarators? ';'
function-definition: type-specifier plain-declarator '(' parameters? ')' compound-statement
parameters: plain-declaration (',' plain-declaration)* (',' '...')?
declarators: declarator (',' declarator)*
init-declarators: init-declarator (',' init-declarator)*
init-declarator: declarator ('=' initializer)?
initializer: assignment-expression
| '{' initializer (',' initializer)* '}'
type-specifier: 'void' | 'char' | 'int' | typedef-name
| struct-or-union identifier? '{' (type-specifier declarators ';')+ '}'
| struct-or-union identifier
struct-or-union: 'struct' | 'union'
plain-declaration: type-specifier declarator
declarator: plain-declarator '(' parameters? ')'
| plain-declarator ('[' constant-expression ']')*
plain-declarator: '*'* identifier
Statements
statement: expression-statement
| compound-statement
| selection-statement
| iteration-statement
| jump-statement
expression-statement: expression? ';'
compound-statement: '{' declaration* statement* '}'
selection-statement: 'if' '(' expression ')' statement ('else' statement)?
iteration-statement: 'while' '(' expression ')' statement
| 'for' '(' expression? ';' expression? ';' expression? ')' statement
jump-statement: 'continue' ';'
| 'break' ';'
| 'return' expression? ';'
Expressions
expression: assignment-expression (',' assignment-expression)*
assignment-expression: logical-or-expression
| unary-expression assignment-operator assignment-expression
assignment-operator: '=' | '*=' | '/=' | '%=' | '+=' | '-=' | '<<=' | '>>=' | '&=' | '^=' | '|='
constant-expression: logical-or-expression
logical-or-expression: logical-and-expression ('||' logical-and-expression)*
logical-and-expression: inclusive-or-expression ('&&' inclusive-or-expression)*
inclusive-or-expression: exclusive-or-expression ('|' exclusive-or-expression)*
exclusive-or-expression: and-expression ('^' and-expression)*
and-expression: equality-expression ('&' equality-expression)*
equality-expression: relational-expression (equality-operator relational-expression)*
equality-operator: '==' | '!='
relational-expression: shift-expression (relational-operator shift-expression)*
relational-operator: '<' | '>' | '<=' | '>='
shift-expression: additive-expression (shift-operator additive-expression)*
shift-operator: '<<' | '>>'
additive-expression: multiplicative-expression (additive-operator multiplicative-expression)*
additive-operator: '+' | '-'
multiplicative-expression: cast-expression (multiplicative-operator cast-expression)*
multiplicative-operator: '*' | '/' | '%'
cast-expression: unary-expression
| '(' type-name ')' cast-expression
type-name: type-specifier '*'*
unary-expression: postfix-expression
| '++' unary-expression
| '--' unary-expression
| unary-operator cast-expression
| 'sizeof' unary-expression
| 'sizeof' '(' type-name ')'
unary-operator: '&' | '*' | '+' | '-' | '~' | '!'
postfix-expression: primary-expression postfix*
postfix: '[' expression ']'
| '(' arguments? ')'
| '.' identifier
| '->' identifier
| '++'
| '--'
arguments: assignment-expression (',' assignment-expression)*
primary-expression: identifier
| constant
| string
| '(' expression ')'
constant: integer-constant
| character-constant