800 lines
24 KiB
Plaintext
800 lines
24 KiB
Plaintext
%defines
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%output "mini_c.tab.cpp"
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%{
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#include <stdio.h>
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#include "ast.h" /* 定义了 ASTNode 结构和 new_* 系列函数 */
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ASTNode *ast_root = NULL; /* 最终的 AST 根 */
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int yylex(void);
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void yyerror(const char *s);
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#define LOC(YYL) SourceLoc{ (YYL).first_line, (YYL).first_column }
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static ASTNode* make_type_spec_node(int ts)
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{
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ASTNode* n = new ASTNode(ASTTag::SPECIFIER);
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n->ival = ts;
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return n;
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}
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%}
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%nonassoc LOWER_THAN_ELSE
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%nonassoc ELSE
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%locations
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%union {
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int ival; /* 运算符枚举、数值常量等整数值 */
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char *sval; /* 标识符、字符串、常量的原始文本 */
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ASTNode *node; /* AST 子树 */
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}
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/*—— 所有会产生 ASTNode* 的 nonterminal ——*/
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%type <node>
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primary_expression
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postfix_expression
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argument_expression_list
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unary_expression
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cast_expression
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multiplicative_expression
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additive_expression
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shift_expression
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relational_expression
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equality_expression
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and_expression
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exclusive_or_expression
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inclusive_or_expression
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logical_and_expression
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logical_or_expression
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conditional_expression
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assignment_expression
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expression
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constant_expression
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declaration
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declaration_specifiers
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init_declarator_list
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init_declarator
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struct_or_union_specifier
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struct_declaration_list
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struct_declaration
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specifier_qualifier_list
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struct_declarator_list
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struct_declarator
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enum_specifier
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enumerator_list
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enumerator
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declarator
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direct_declarator
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pointer
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type_qualifier_list
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parameter_type_list
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parameter_list
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parameter_declaration
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identifier_list
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type_name
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abstract_declarator
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direct_abstract_declarator
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initializer
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initializer_list
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designation
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designator_list
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designator
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statement
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labeled_statement
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compound_statement
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block_item_list
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block_item
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expression_statement
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selection_statement
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iteration_statement
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jump_statement
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translation_unit
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external_declaration
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function_definition
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declaration_list
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;
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/*—— 运算符枚举，用 ival 存 ——*/
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%type <ival> assignment_operator unary_operator
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%type <ival> storage_class_specifier type_qualifier function_specifier
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%type <node> type_specifier
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%type <ival> struct_or_union
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/*—— token 的语义值类型 ——*/
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%token <sval> IDENTIFIER
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%token <sval> CONSTANT
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%token <sval> STRING_LITERAL
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%token <sval> TYPE_NAME
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%token SIZEOF
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%token PTR_OP INC_OP DEC_OP LEFT_OP RIGHT_OP
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%token LE_OP GE_OP EQ_OP NE_OP AND_OP OR_OP
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%token MUL_ASSIGN DIV_ASSIGN MOD_ASSIGN ADD_ASSIGN SUB_ASSIGN
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%token LEFT_ASSIGN RIGHT_ASSIGN AND_ASSIGN XOR_ASSIGN OR_ASSIGN
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%token TYPEDEF EXTERN STATIC AUTO REGISTER INLINE RESTRICT
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%token CHAR SHORT INT LONG SIGNED UNSIGNED FLOAT DOUBLE CONST VOLATILE VOID
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%token BOOL COMPLEX IMAGINARY
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%token STRUCT UNION ENUM ELLIPSIS
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%token CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN
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%start translation_unit
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%%
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primary_expression
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: IDENTIFIER { $$ = new_id_node($1, LOC(@1)); }
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| CONSTANT { $$ = new_const_node($1, LOC(@1)); }
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| STRING_LITERAL { $$ = new_string_node($1, LOC(@1)); }
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| '(' expression ')' { $$ = $2; $$->loc = LOC(@3); }
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;
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postfix_expression
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: primary_expression { $$ = $1; }
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| postfix_expression '[' expression ']' { $$ = new_array_ref_node($1, $3, LOC(@2)); }
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| postfix_expression '(' ')' { $$ = new_func_call_node($1, NULL, LOC(@2)); }
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| postfix_expression '(' argument_expression_list ')' { $$ = new_func_call_node($1, $3, LOC(@2)); }
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| postfix_expression '.' IDENTIFIER { $$ = new_struct_ref_node($1, $3, false, LOC(@2)); }
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| postfix_expression PTR_OP IDENTIFIER { $$ = new_struct_ref_node($1, $3, true, LOC(@2)); }
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| postfix_expression INC_OP { $$ = new_post_inc_node($1, LOC(@2)); }
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| postfix_expression DEC_OP { $$ = new_post_dec_node($1, LOC(@2)); }
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| '(' type_name ')' '{' initializer_list '}' { $$ = new_compound_literal_node($2, $5, LOC(@1)); }
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| '(' type_name ')' '{' initializer_list ',' '}' { $$ = new_compound_literal_node($2, $5, LOC(@1)); }
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;
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argument_expression_list
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: assignment_expression { $$ = new_arg_list($1, LOC(@1)); }
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| argument_expression_list ',' assignment_expression { $$ = append_arg_list($1, $3, LOC(@2)); }
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;
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unary_expression
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: postfix_expression { $$ = $1; }
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| INC_OP unary_expression { $$ = new_pre_inc_node($2, LOC(@1)); }
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| DEC_OP unary_expression { $$ = new_pre_dec_node($2, LOC(@1)); }
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| unary_operator cast_expression { $$ = new_unary_op_node($1, $2, LOC(@1)); }
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| SIZEOF unary_expression { $$ = new_sizeof_node($2, false, LOC(@1)); }
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| SIZEOF '(' type_name ')' { $$ = new_sizeof_node($3, true, LOC(@1)); }
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;
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unary_operator
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: '&' { $$ = op_address; }
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| '*' { $$ = op_deref; }
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| '+' { $$ = op_unary_plus; }
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| '-' { $$ = op_neg; }
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| '~' { $$ = op_bitnot; }
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| '!' { $$ = op_not; }
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;
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cast_expression
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: unary_expression { $$ = $1; }
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| '(' type_name ')' cast_expression { $$ = new_cast_node($2, $4, LOC(@1)); }
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;
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multiplicative_expression
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: cast_expression { $$ = $1; }
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| multiplicative_expression '*' cast_expression { $$ = new_binop_node('*', $1, $3, LOC(@2)); }
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| multiplicative_expression '/' cast_expression { $$ = new_binop_node('/', $1, $3, LOC(@2)); }
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| multiplicative_expression '%' cast_expression { $$ = new_binop_node('%', $1, $3, LOC(@2)); }
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;
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additive_expression
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: multiplicative_expression { $$ = $1; }
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| additive_expression '+' multiplicative_expression { $$ = new_binop_node('+', $1, $3, LOC(@2)); }
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| additive_expression '-' multiplicative_expression { $$ = new_binop_node('-', $1, $3, LOC(@2)); }
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;
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shift_expression
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: additive_expression { $$ = $1; }
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| shift_expression LEFT_OP additive_expression { $$ = new_binop_node(SHL, $1, $3, LOC(@2)); }
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| shift_expression RIGHT_OP additive_expression { $$ = new_binop_node(SHR, $1, $3, LOC(@2)); }
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;
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relational_expression
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: shift_expression { $$ = $1; }
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| relational_expression '<' shift_expression { $$ = new_binop_node('<', $1, $3, LOC(@2)); }
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| relational_expression '>' shift_expression { $$ = new_binop_node('>', $1, $3, LOC(@2)); }
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| relational_expression LE_OP shift_expression { $$ = new_binop_node(LE, $1, $3, LOC(@2)); }
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| relational_expression GE_OP shift_expression { $$ = new_binop_node(GE, $1, $3, LOC(@2)); }
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;
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equality_expression
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: relational_expression { $$ = $1; }
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| equality_expression EQ_OP relational_expression { $$ = new_binop_node(EQ, $1, $3, LOC(@2)); }
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| equality_expression NE_OP relational_expression { $$ = new_binop_node(NE, $1, $3, LOC(@2)); }
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;
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and_expression
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: equality_expression
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{ $$ = $1; }
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| and_expression '&' equality_expression
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{ $$ = new_binop_node('&', $1, $3, LOC(@2)); }
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;
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exclusive_or_expression
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: and_expression
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{ $$ = $1; }
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| exclusive_or_expression '^' and_expression
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{ $$ = new_binop_node('^', $1, $3, LOC(@2)); }
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;
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inclusive_or_expression
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: exclusive_or_expression
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{ $$ = $1; }
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| inclusive_or_expression '|' exclusive_or_expression
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{ $$ = new_binop_node('|', $1, $3, LOC(@2)); }
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;
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logical_and_expression
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: inclusive_or_expression
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{ $$ = $1; }
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| logical_and_expression AND_OP inclusive_or_expression
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{ $$ = new_logical_and_node($1, $3, LOC(@2)); }
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;
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logical_or_expression
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: logical_and_expression
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{ $$ = $1; }
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| logical_or_expression OR_OP logical_and_expression
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{ $$ = new_logical_or_node($1, $3, LOC(@2)); }
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;
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conditional_expression
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: logical_or_expression
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{ $$ = $1; }
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| logical_or_expression '?' expression ':' conditional_expression
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{ $$ = new_conditional_node($1, $3, $5, LOC(@2)); }
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;
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assignment_expression
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: conditional_expression
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{ $$ = $1; }
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| unary_expression assignment_operator assignment_expression
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{ $$ = new_assign_node($1, $2, $3, LOC(@2)); }
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;
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assignment_operator
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: '=' { $$ = op_assign; }
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| MUL_ASSIGN { $$ = op_mul_assign; }
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| DIV_ASSIGN { $$ = op_div_assign; }
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| MOD_ASSIGN { $$ = op_mod_assign; }
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| ADD_ASSIGN { $$ = op_add_assign; }
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| SUB_ASSIGN { $$ = op_sub_assign; }
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| LEFT_ASSIGN { $$ = op_shl_assign; }
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| RIGHT_ASSIGN { $$ = op_shr_assign; }
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| AND_ASSIGN { $$ = op_and_assign; }
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| XOR_ASSIGN { $$ = op_xor_assign; }
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| OR_ASSIGN { $$ = op_or_assign; }
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;
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expression
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: assignment_expression
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{ $$ = $1; }
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| expression ',' assignment_expression
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{ $$ = new_expr_list($1, $3, LOC(@2)); }
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;
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constant_expression
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: conditional_expression
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{ $$ = $1; }
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;
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/* 声明相关 */
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declaration
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: declaration_specifiers ';'
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{ $$ = new_decl_stmt($1, LOC(@2)); }
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| declaration_specifiers init_declarator_list ';'
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{ $$ = new_declaration($1, $2, LOC(@3)); }
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;
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declaration_specifiers
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: storage_class_specifier
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{ $$ = new_spec_list($1, LOC(@1)); }
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| storage_class_specifier declaration_specifiers
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{ $$ = append_spec_list($2, $1, LOC(@1)); }
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| type_specifier
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{ $$ = new_spec_list($1, LOC(@1)); }
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| type_specifier declaration_specifiers
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{ $$ = append_spec_list($2, $1, LOC(@1)); }
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| type_qualifier
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{ $$ = new_spec_list($1, LOC(@1)); }
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| type_qualifier declaration_specifiers
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{ $$ = append_spec_list($2, $1, LOC(@1)); }
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| function_specifier
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{ $$ = new_spec_list($1, LOC(@1)); }
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| function_specifier declaration_specifiers
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{ $$ = append_spec_list($2, $1, LOC(@1)); }
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;
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init_declarator_list
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: init_declarator
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{ $$ = new_init_list($1, LOC(@1)); }
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| init_declarator_list ',' init_declarator
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{ $$ = append_init_list($1, $3, LOC(@2)); }
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;
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init_declarator
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: declarator
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{ $$ = new_init_decl($1, NULL, LOC(@1)); }
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| declarator '=' initializer
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{ $$ = new_init_decl($1, $3, LOC(@2)); }
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;
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storage_class_specifier
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: TYPEDEF { $$ = SC_TYPEDEF; }
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| EXTERN { $$ = SC_EXTERN; }
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| STATIC { $$ = SC_STATIC; }
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| AUTO { $$ = SC_AUTO; }
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| REGISTER { $$ = SC_REGISTER; }
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;
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type_specifier
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: VOID { $$ = make_type_spec_node(TS_VOID); }
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| CHAR { $$ = make_type_spec_node(TS_CHAR); }
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| SHORT { $$ = make_type_spec_node(TS_SHORT); }
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| INT { $$ = make_type_spec_node(TS_INT); }
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| LONG { $$ = make_type_spec_node(TS_LONG); }
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| FLOAT { $$ = make_type_spec_node(TS_FLOAT); }
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| DOUBLE { $$ = make_type_spec_node(TS_DOUBLE); }
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| SIGNED { $$ = make_type_spec_node(TS_SIGNED); }
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| UNSIGNED { $$ = make_type_spec_node(TS_UNSIGNED); }
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| BOOL { $$ = make_type_spec_node(TS_BOOL); }
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| COMPLEX { $$ = make_type_spec_node(TS_COMPLEX); }
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| IMAGINARY { $$ = make_type_spec_node(TS_IMAGINARY); }
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| struct_or_union_specifier
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{ $$ = $1; }
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| enum_specifier
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{ $$ = $1; }
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| TYPE_NAME
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{ $$ = make_type_spec_node(TS_TYPE_NAME); }
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;
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struct_or_union_specifier
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: struct_or_union IDENTIFIER '{' struct_declaration_list '}'
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{ $$ = new_struct_su_node(static_cast<StructUnionKind>($1), $2, $4, LOC(@2)); }
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| struct_or_union '{' struct_declaration_list '}'
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{ $$ = new_struct_su_node(static_cast<StructUnionKind>($1), nullptr, $3, LOC(@2)); }
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| struct_or_union IDENTIFIER
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{ $$ = new_struct_su_node(static_cast<StructUnionKind>($1), $2, nullptr, LOC(@2)); }
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;
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struct_or_union
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: STRUCT { $$ = SU_STRUCT; }
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| UNION { $$ = SU_UNION; }
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;
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struct_declaration_list
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: struct_declaration
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{ $$ = new_sdecl_list($1, LOC(@1)); }
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| struct_declaration_list struct_declaration
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{ $$ = append_sdecl_list($1, $2, LOC(@2)); }
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;
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struct_declaration
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: specifier_qualifier_list struct_declarator_list ';'
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{ $$ = new_struct_decl($1, $2, LOC(@3)); }
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;
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specifier_qualifier_list
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: type_specifier specifier_qualifier_list
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{ $$ = append_specq_list($2, $1, LOC(@1)); }
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| type_specifier
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{ $$ = new_specq_list($1, LOC(@1)); }
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| type_qualifier specifier_qualifier_list
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{ $$ = append_specq_list($2, $1, LOC(@1)); }
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| type_qualifier
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{ $$ = new_specq_list($1, LOC(@1)); }
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;
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struct_declarator_list
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: struct_declarator
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{ $$ = new_sdeclarator_list($1, LOC(@1)); }
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| struct_declarator_list ',' struct_declarator
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{ $$ = append_sdeclarator_list($1, $3, LOC(@2)); }
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;
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struct_declarator
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: declarator
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{ $$ = $1; }
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| ':' constant_expression
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{ $$ = new_bitfield_node(NULL, $2, LOC(@1)); }
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| declarator ':' constant_expression
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{ $$ = new_bitfield_node($1, $3, LOC(@2)); }
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;
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enum_specifier
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: ENUM '{' enumerator_list '}'
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{ $$ = new_enum_node(NULL, $3, LOC(@1)); }
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| ENUM IDENTIFIER '{' enumerator_list '}'
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{ $$ = new_enum_node($2, $4, LOC(@1)); }
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| ENUM '{' enumerator_list ',' '}'
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{ $$ = new_enum_node(NULL, $3, LOC(@1)); }
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| ENUM IDENTIFIER '{' enumerator_list ',' '}'
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{ $$ = new_enum_node($2, $4, LOC(@1)); }
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| ENUM IDENTIFIER
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{ $$ = new_enum_node($2, NULL, LOC(@1)); }
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;
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enumerator_list
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: enumerator
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{ $$ = new_enum_list($1, LOC(@1)); }
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| enumerator_list ',' enumerator
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{ $$ = append_enum_list($1, $3, LOC(@2)); }
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;
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enumerator
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: IDENTIFIER
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{ $$ = new_enum_const($1, NULL, LOC(@1)); }
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| IDENTIFIER '=' constant_expression
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{ $$ = new_enum_const($1, $3, LOC(@1)); }
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;
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type_qualifier
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: CONST
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{ $$ = TQ_CONST; }
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| RESTRICT
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{ $$ = TQ_RESTRICT; }
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| VOLATILE
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{ $$ = TQ_VOLATILE; }
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;
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function_specifier
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: INLINE
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{ $$ = FS_INLINE; }
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;
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declarator
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: pointer direct_declarator
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{ $$ = new_declarator_node($1, $2, LOC(@1)); }
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| direct_declarator
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{ $$ = new_declarator_node(NULL, $1, LOC(@1)); }
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;
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direct_declarator
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: IDENTIFIER
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|
{ $$ = new_decl_ident($1, LOC(@1)); }
|
|
| '(' declarator ')'
|
|
{ $$ = $2; $$->loc = LOC(@3); }
|
|
| direct_declarator '[' type_qualifier_list assignment_expression ']'
|
|
{ $$ = new_array_decl($1, $3, $4, NULL, NULL, LOC(@2)); }
|
|
| direct_declarator '[' type_qualifier_list ']'
|
|
{ $$ = new_array_decl($1, $3, NULL, NULL, NULL, LOC(@2)); }
|
|
| direct_declarator '[' assignment_expression ']'
|
|
{ $$ = new_array_decl($1, NULL, $3, NULL, NULL, LOC(@2)); }
|
|
| direct_declarator '[' STATIC type_qualifier_list assignment_expression ']'
|
|
{ $$ = new_array_decl($1, $4, $5, true, NULL, LOC(@2)); }
|
|
| direct_declarator '[' type_qualifier_list STATIC assignment_expression ']'
|
|
{ $$ = new_array_decl($1, $3, $5, true, NULL, LOC(@2)); }
|
|
| direct_declarator '[' type_qualifier_list '*' ']'
|
|
{ $$ = new_array_decl($1, $3, NULL, NULL, true, LOC(@2)); }
|
|
| direct_declarator '[' '*' ']'
|
|
{ $$ = new_array_decl($1, NULL, NULL, NULL, true, LOC(@2)); }
|
|
| direct_declarator '[' ']'
|
|
{ $$ = new_array_decl($1, NULL, NULL, NULL, false, LOC(@2)); }
|
|
| direct_declarator '(' parameter_type_list ')'
|
|
{ $$ = new_func_decl($1, $3, LOC(@2)); }
|
|
| direct_declarator '(' identifier_list ')'
|
|
{ $$ = new_oldstyle_func_decl($1, $3, LOC(@2)); }
|
|
| direct_declarator '(' ')'
|
|
{ $$ = new_func_decl($1, NULL, LOC(@2)); }
|
|
;
|
|
|
|
|
|
pointer
|
|
: '*'
|
|
{ $$ = new_pointer(NULL, LOC(@1)); }
|
|
| '*' type_qualifier_list
|
|
{ $$ = new_pointer($2, LOC(@1)); }
|
|
| '*' pointer
|
|
{ $$ = prepend_pointer(NULL, $2, LOC(@1)); }
|
|
| '*' type_qualifier_list pointer
|
|
{ $$ = prepend_pointer($2, $3, LOC(@1)); }
|
|
;
|
|
|
|
|
|
type_qualifier_list
|
|
: type_qualifier
|
|
{ $$ = new_tq_list($1, LOC(@1)); }
|
|
| type_qualifier_list type_qualifier
|
|
{ $$ = append_tq_list($1, $2, LOC(@2)); }
|
|
;
|
|
|
|
parameter_type_list
|
|
: parameter_list
|
|
{ $$ = $1; }
|
|
| parameter_list ',' ELLIPSIS
|
|
{ $$ = new_param_list_ellipsis($1, LOC(@2)); }
|
|
;
|
|
|
|
|
|
parameter_list
|
|
: parameter_declaration
|
|
{ $$ = new_param_list($1, LOC(@1)); }
|
|
| parameter_list ',' parameter_declaration
|
|
{ $$ = append_param_list($1, $3, LOC(@2)); }
|
|
;
|
|
|
|
|
|
parameter_declaration
|
|
: declaration_specifiers declarator
|
|
{ $$ = new_param_decl($1, $2, LOC(@2)); }
|
|
| declaration_specifiers abstract_declarator
|
|
{ $$ = new_param_decl($1, $2, LOC(@2)); }
|
|
| declaration_specifiers
|
|
{ $$ = new_param_decl($1, NULL, LOC(@1)); }
|
|
;
|
|
|
|
|
|
identifier_list
|
|
: IDENTIFIER
|
|
{ $$ = new_id_list($1, LOC(@1)); }
|
|
| identifier_list ',' IDENTIFIER
|
|
{ $$ = append_id_list($1, $3, LOC(@3)); }
|
|
;
|
|
|
|
type_name
|
|
: specifier_qualifier_list
|
|
{ $$ = new_type_name($1, NULL, LOC(@1)); }
|
|
| specifier_qualifier_list abstract_declarator
|
|
{ $$ = new_type_name($1, $2, LOC(@1)); }
|
|
;
|
|
|
|
|
|
abstract_declarator
|
|
: pointer
|
|
{ $$ = new_abs_decl($1, NULL, LOC(@1)); }
|
|
| direct_abstract_declarator
|
|
{ $$ = new_abs_decl(NULL, $1, LOC(@1)); }
|
|
| pointer direct_abstract_declarator
|
|
{ $$ = new_abs_decl($1, $2, LOC(@1)); }
|
|
;
|
|
|
|
|
|
direct_abstract_declarator
|
|
: '(' abstract_declarator ')'
|
|
{ $$ = $2; $$->loc = LOC(@3); }
|
|
| '[' ']'
|
|
{ $$ = new_abs_array(NULL, NULL, LOC(@1)); }
|
|
| '[' assignment_expression ']'
|
|
{ $$ = new_abs_array($2, NULL, LOC(@1)); }
|
|
| direct_abstract_declarator '[' ']'
|
|
{ $$ = new_abs_array_child($1, NULL, NULL, LOC(@2)); }
|
|
| direct_abstract_declarator '[' assignment_expression ']'
|
|
{ $$ = new_abs_array_child($1, $3, NULL, LOC(@2)); }
|
|
| '[' '*' ']'
|
|
{ $$ = new_abs_array(NULL, true, LOC(@1)); }
|
|
| direct_abstract_declarator '[' '*' ']'
|
|
{ $$ = new_abs_array_child($1, NULL, true, LOC(@2)); }
|
|
| '(' ')'
|
|
{ $$ = new_abs_func(NULL, LOC(@1)); }
|
|
| '(' parameter_type_list ')'
|
|
{ $$ = new_abs_func($2, LOC(@1)); }
|
|
| direct_abstract_declarator '(' ')'
|
|
{ $$ = new_abs_func_child($1, NULL, LOC(@2)); }
|
|
| direct_abstract_declarator '(' parameter_type_list ')'
|
|
{ $$ = new_abs_func_child($1, $3, LOC(@2)); }
|
|
;
|
|
|
|
|
|
initializer
|
|
: assignment_expression
|
|
{ $$ = new_init_expr($1, LOC(@1)); }
|
|
| '{' initializer_list '}'
|
|
{ $$ = new_init_list_node($2, LOC(@1)); }
|
|
| '{' initializer_list ',' '}'
|
|
{ $$ = new_init_list_node($2, LOC(@1)); }
|
|
;
|
|
|
|
|
|
initializer_list
|
|
: initializer
|
|
{ $$ = new_init_item_list($1, LOC(@1)); }
|
|
| designation initializer
|
|
{ $$ = new_designated_init($1, $2, LOC(@1)); }
|
|
| initializer_list ',' initializer
|
|
{ $$ = append_init_item($1, $3, LOC(@2)); }
|
|
| initializer_list ',' designation initializer
|
|
{ $$ = append_designated_init($1, $3, $4, LOC(@2)); }
|
|
;
|
|
|
|
|
|
designation
|
|
: designator_list '='
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
|
|
designator_list
|
|
: designator
|
|
{ $$ = new_designator_list($1, LOC(@1)); }
|
|
| designator_list designator
|
|
{ $$ = append_designator_list($1, $2, LOC(@2)); }
|
|
;
|
|
|
|
designator
|
|
: '[' constant_expression ']'
|
|
{ $$ = new_array_designator($2, LOC(@1)); }
|
|
| '.' IDENTIFIER
|
|
{ $$ = new_field_designator($2, LOC(@1)); }
|
|
;
|
|
|
|
|
|
statement
|
|
: labeled_statement { $$ = $1; }
|
|
| compound_statement { $$ = $1; }
|
|
| expression_statement { $$ = $1; }
|
|
| selection_statement { $$ = $1; }
|
|
| iteration_statement { $$ = $1; }
|
|
| jump_statement { $$ = $1; }
|
|
;
|
|
|
|
|
|
labeled_statement
|
|
: IDENTIFIER ':' statement
|
|
{ $$ = new_labeled_stmt_id($1, $3, LOC(@1)); }
|
|
| CASE constant_expression ':' statement
|
|
{ $$ = new_case_stmt($2, $4, LOC(@1)); }
|
|
| DEFAULT ':' statement
|
|
{ $$ = new_default_stmt($3, LOC(@1)); }
|
|
;
|
|
|
|
compound_statement
|
|
: '{' '}'
|
|
{ $$ = new_compound_stmt(NULL, LOC(@1)); }
|
|
| '{' block_item_list '}'
|
|
{ $$ = new_compound_stmt($2, LOC(@1)); }
|
|
;
|
|
|
|
|
|
block_item_list
|
|
: block_item
|
|
{ $$ = new_block_item_list($1, LOC(@1)); }
|
|
| block_item_list block_item
|
|
{ $$ = append_block_item_list($1, $2, LOC(@2)); }
|
|
;
|
|
|
|
|
|
block_item
|
|
: declaration
|
|
{ $$ = new_block_decl($1, LOC(@1)); }
|
|
| statement
|
|
{ $$ = new_block_stmt($1, LOC(@1)); }
|
|
;
|
|
|
|
|
|
expression_statement
|
|
: ';'
|
|
{ $$ = NULL; }
|
|
| expression ';'
|
|
{ $$ = new_expr_stmt($1, LOC(@2)); }
|
|
;
|
|
|
|
selection_statement
|
|
: IF '(' expression ')' statement %prec LOWER_THAN_ELSE
|
|
{ $$ = new_if_stmt($3, $5, NULL, LOC(@1)); }
|
|
| IF '(' expression ')' statement ELSE statement
|
|
{ $$ = new_if_stmt($3, $5, $7, LOC(@1)); }
|
|
| SWITCH '(' expression ')' statement
|
|
{ $$ = new_switch_stmt($3, $5, LOC(@1)); }
|
|
;
|
|
|
|
iteration_statement
|
|
: WHILE '(' expression ')' statement
|
|
{ $$ = new_while_stmt($3, $5, LOC(@1)); }
|
|
| DO statement WHILE '(' expression ')' ';'
|
|
{ $$ = new_do_while_stmt($2, $5, LOC(@1)); }
|
|
| FOR '(' expression_statement expression_statement ')' statement
|
|
{ $$ = new_for_stmt($3, $4, NULL, $6, LOC(@1)); }
|
|
| FOR '(' expression_statement expression_statement expression ')' statement
|
|
{ $$ = new_for_stmt($3, $4, $5, $7, LOC(@1)); }
|
|
| FOR '(' declaration expression_statement ')' statement
|
|
{ $$ = new_for_decl_stmt($3, $4, NULL, $6, LOC(@1)); }
|
|
| FOR '(' declaration expression_statement expression ')' statement
|
|
{ $$ = new_for_decl_stmt($3, $4, $5, $7, LOC(@1)); }
|
|
;
|
|
|
|
|
|
jump_statement
|
|
: GOTO IDENTIFIER ';'
|
|
{ $$ = new_goto_stmt($2, LOC(@1)); }
|
|
| CONTINUE ';'
|
|
{ $$ = new_continue_stmt(LOC(@1)); }
|
|
| BREAK ';'
|
|
{ $$ = new_break_stmt(LOC(@1)); }
|
|
| RETURN ';'
|
|
{ $$ = new_return_stmt(NULL, LOC(@1)); }
|
|
| RETURN expression ';'
|
|
{ $$ = new_return_stmt($2, LOC(@1)); }
|
|
;
|
|
|
|
|
|
translation_unit
|
|
: external_declaration
|
|
{ ast_root = $$ = $1; }
|
|
| translation_unit external_declaration
|
|
{ ast_root = $$ = new_translation_unit($1, $2, LOC(@2)); }
|
|
;
|
|
|
|
external_declaration
|
|
: function_definition
|
|
{ $$ = $1; }
|
|
| declaration
|
|
{ $$ = new_decl_stmt($1, LOC(@1)); }
|
|
;
|
|
|
|
|
|
function_definition
|
|
: declaration_specifiers declarator declaration_list compound_statement
|
|
{ $$ = new_function_def($1, $2, $3, $4, LOC(@2)); }
|
|
| declaration_specifiers declarator compound_statement
|
|
{ $$ = new_function_def($1, $2, NULL, $3, LOC(@2)); }
|
|
;
|
|
|
|
|
|
declaration_list
|
|
: declaration
|
|
{ $$ = new_declaration_list($1, LOC(@1)); }
|
|
| declaration_list declaration
|
|
{ $$ = append_declaration_list($1, $2, LOC(@2)); }
|
|
;
|
|
|
|
|
|
%%
|
|
#include <stdio.h>
|
|
|
|
extern char yytext[];
|
|
extern int column;
|
|
|
|
void yyerror(char const *s)
|
|
{
|
|
fflush(stdout);
|
|
printf("\n%*s\n%*s\n", column, "^", column, s);
|
|
}
|