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bison_c.y
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%{
#include <stdio.h>
#include <stdlib.h>
#include "ast_node.h"
void yyerror(char *s);
%}
%union {
struct AstNode *a;
double d;
char s[32];
}
%token AUTO DEFINE EXTERN REGISTER STATIC TYPEDEF
%token CHAR DOUBLE FLOAT INT LONG SHORT SIGNED UNSIGNED VOID VOLATILE
%token BREAK CASE CONTINUE DEFAULT DO ELSE FOR GOTO IF RETURN SWITCH WHILE
%token ENUM STRUCT UNION SIZEOF
%token <d> NUMBER
%token <s> IDENTIFIER CHARACTER STRING_CONSTANT
%token ADD_ASSIGN SUB_ASSIGN MUL_ASSIGN DIV_ASSIGN INC_OP DEC_OP AND_OP OR_OP LE_OP GE_OP EQ_OP NE_OP
%type <a> primary_expression postfix_expression argument_expression_list unary_expression unary_operator cast_expression
%type <a> type_name multiplicative_expression additive_expression relational_expression equality_expression and_expression
%type <a> exclusive_or_expression inclusive_or_expression logical_and_expression logical_or_expression expression
%type <a> declaration init_declarator_list init_declarator declarator initializer
%type <a> statement assignment_statement expression_statement selection_statement iteration_statement jump_statement
%type <a> translation_unit function_definition compound_statement block_item_list block_item
%start translation_unit
%nonassoc LOWER_THAN_ELSE /* 定义优先级，解决二义性 */
%nonassoc ELSE
%%
primary_expression
: IDENTIFIER /*标识符*/ { $$ = newAstNode(Identifier, newNodeValue(0, $1), linesno); }
| NUMBER /*数字*/ { $$ = newAstNode(Number, newNodeValue(1, $1), linesno); }
| CHARACTER /*字符*/ { $$ = newAstNode(String, newNodeValue(0, $1), linesno); }
| STRING_CONSTANT /*字符串常量*/ { $$ = newAstNode(String, newNodeValue(0, $1), linesno); }
| '(' expression ')' { $$ = newAstNode(Expression, newNodeValue(0, "primary_expression"), linesno);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), linesno);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), linesno);
linkAstNode($$, left_bracket, $2, right_bracket, NULL); }
;
postfix_expression /*数组，自定义函数 均未考虑*/
: primary_expression { $$ = $1; }
| postfix_expression INC_OP { $$ = newAstNode(Expression, newNodeValue(0, "postfix_expression"), linesno);
AstNode *inc_op = newAstNode(Operator, newNodeValue(0, "++"), linesno);
linkAstNode($$, $1, inc_op, NULL); }
| postfix_expression DEC_OP { $$ = newAstNode(Expression, newNodeValue(0, "postfix_expression"), linesno);
AstNode *dec_op = newAstNode(Operator, newNodeValue(0, "--"), linesno);
linkAstNode($$, $1, dec_op, NULL); }
| postfix_expression '(' ')' /*无参库函数调用*/
{ $$ = newAstNode(Expression, newNodeValue(0, "postfix_expression"), linesno);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), linesno);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), linesno);
linkAstNode($$, $1, left_bracket, right_bracket, NULL); }
| postfix_expression '(' argument_expression_list ')' /*有参库函数调用*/
{ $$ = newAstNode(Expression, newNodeValue(0, "postfix_expression"), linesno);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), linesno);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), linesno);
linkAstNode($$, $1, left_bracket, $3, right_bracket, NULL); }
;
unary_expression
: postfix_expression { $$ = $1; }
| INC_OP unary_expression { $$ = newAstNode(Expression, newNodeValue(0, "unary_expression"), linesno);
AstNode *inc_op = newAstNode(Operator, newNodeValue(0, "++"), linesno);
linkAstNode($$, inc_op, $2, NULL); }
| DEC_OP unary_expression { $$ = newAstNode(Expression, newNodeValue(0, "unary_expression"), linesno);
AstNode *dec_op = newAstNode(Operator, newNodeValue(0, "--"), linesno);
linkAstNode($$, dec_op, $2, NULL); }
| unary_operator cast_expression { $$ = newAstNode(Expression, newNodeValue(0, "unary_expression"), linesno);
linkAstNode($$, $1, $2, NULL); }
;
unary_operator /*未考虑指针和取地址符*/
: '+' { $$ = newAstNode(Operator, newNodeValue(0, "+"), linesno); }
| '-' { $$ = newAstNode(Operator, newNodeValue(0, "-"), linesno); }
| '~' { $$ = newAstNode(Operator, newNodeValue(0, "~"), linesno); }
| '!' { $$ = newAstNode(Operator, newNodeValue(0, "!"), linesno); }
| '&' { $$ = newAstNode(Operator, newNodeValue(0, "&"), linesno); }
;
cast_expression
: unary_expression { $$ = $1; }
| '(' type_name ')' cast_expression /*强制类型转换*/
{ $$ = newAstNode(Expression, newNodeValue(0, "cast_expression"), linesno);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), linesno);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), linesno);
linkAstNode($$, left_bracket, $2, right_bracket, $4, NULL); }
;
multiplicative_expression
: cast_expression { $$ = $1; }
| multiplicative_expression '*' cast_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "multiplicative_expression"), linesno);
AstNode *multiply = newAstNode(Operator, newNodeValue(0, "*"), linesno);
linkAstNode($$, $1, multiply, $3, NULL); }
| multiplicative_expression '/' cast_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "multiplicative_expression"), linesno);
AstNode *divide = newAstNode(Operator, newNodeValue(0, "/"), linesno);
linkAstNode($$, $1, divide, $3, NULL); }
| multiplicative_expression '%' cast_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "multiplicative_expression"), linesno);
AstNode *divide = newAstNode(Operator, newNodeValue(0, "%"), linesno);
linkAstNode($$, $1, divide, $3, NULL); }
;
additive_expression
: multiplicative_expression { $$ = $1; }
| additive_expression '+' multiplicative_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "additive_expression"), linesno);
AstNode *add = newAstNode(Operator, newNodeValue(0, "+"), linesno);
linkAstNode($$, $1, add, $3, NULL); }
| additive_expression '-' multiplicative_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "additive_expression"), linesno);
AstNode *sub = newAstNode(Operator, newNodeValue(0, "-"), linesno);
linkAstNode($$, $1, sub, $3, NULL); }
;
/*没有考虑移位运算*/
relational_expression
: additive_expression { $$ = $1; }
| relational_expression '<' additive_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "relational_expression"), linesno);
AstNode *less = newAstNode(Operator, newNodeValue(0, "<"), linesno);
linkAstNode($$, $1, less, $3, NULL); }
| relational_expression '>' additive_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "relational_expression"), linesno);
AstNode *greater = newAstNode(Operator, newNodeValue(0, ">"), linesno);
linkAstNode($$, $1, greater, $3, NULL); }
| relational_expression LE_OP additive_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "relational_expression"), linesno);
AstNode *le_op = newAstNode(Operator, newNodeValue(0, "<="), linesno);
linkAstNode($$, $1, le_op, $3, NULL); }
| relational_expression GE_OP additive_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "relational_expression"), linesno);
AstNode *ge_op = newAstNode(Operator, newNodeValue(0, ">="), linesno);
linkAstNode($$, $1, ge_op, $3, NULL); }
;
equality_expression
: relational_expression { $$ = $1; }
| equality_expression EQ_OP relational_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "equality_expression"), linesno);
AstNode *eq_op = newAstNode(Operator, newNodeValue(0, "=="), linesno);
linkAstNode($$, $1, eq_op, $3, NULL); }
| equality_expression NE_OP relational_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "equality_expression"), linesno);
AstNode *ne_op = newAstNode(Operator, newNodeValue(0, "!="), linesno);
linkAstNode($$, $1, ne_op, $3, NULL); }
;
and_expression
: equality_expression { $$ = $1; }
| and_expression '&' equality_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "and_expression"), linesno);
AstNode *and = newAstNode(Operator, newNodeValue(0, "&"), linesno);
linkAstNode($$, $1, and, $3, NULL); }
;
exclusive_or_expression
: and_expression { $$ = $1; }
| exclusive_or_expression '^' and_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "exclusive_or_expression"), linesno);
AstNode *e_or = newAstNode(Operator, newNodeValue(0, "^"), linesno);
linkAstNode($$, $1, e_or, $3, NULL); }
;
inclusive_or_expression
: exclusive_or_expression { $$ = $1; }
| inclusive_or_expression '|' exclusive_or_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "inclusive_or_expression"), linesno);
AstNode *i_or = newAstNode(Operator, newNodeValue(0, "|"), linesno);
linkAstNode($$, $1, i_or, $3, NULL); }
;
logical_and_expression
: inclusive_or_expression { $$ = $1; }
| logical_and_expression AND_OP inclusive_or_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "logical_and_expression"), linesno);
AstNode *l_and = newAstNode(Operator, newNodeValue(0, "&&"), linesno);
linkAstNode($$, $1, l_and, $3, NULL); }
;
logical_or_expression
: logical_and_expression { $$ = $1; }
| logical_or_expression OR_OP logical_and_expression
{ $$ = newAstNode(Expression, newNodeValue(0, "logical_or_expression"), linesno);
AstNode *l_or = newAstNode(Operator, newNodeValue(0, "||"), linesno);
linkAstNode($$, $1, l_or, $3, NULL); }
;
expression
: logical_or_expression { $$ = $1; }
;
argument_expression_list
: expression { $$ = $1; }
| argument_expression_list ',' expression
{ $$ = newAstNode(Expression, newNodeValue(0, "argument_expression_list"), linesno);
AstNode *comma = newAstNode(Operator, newNodeValue(0, ","), linesno);
linkAstNode($$, $1, comma, $3, NULL); }
;
declaration /* 暂时只考虑了简单的变量声明 */
: type_name init_declarator_list ';'
{ $$ = newAstNode(Declaration, newNodeValue(0, "declaration"), linesno);
linkAstNode($$, $1, $2, NULL); }
;
type_name /* 类型名 */
: CHAR { $$ = newAstNode(Keyword, newNodeValue(0, "char"), linesno); }
| DOUBLE { $$ = newAstNode(Keyword, newNodeValue(0, "double"), linesno); }
| FLOAT { $$ = newAstNode(Keyword, newNodeValue(0, "float"), linesno); }
| INT { $$ = newAstNode(Keyword, newNodeValue(0, "int"), linesno); }
| LONG { $$ = newAstNode(Keyword, newNodeValue(0, "long"), linesno); }
| SHORT { $$ = newAstNode(Keyword, newNodeValue(0, "short"), linesno); }
| SIGNED { $$ = newAstNode(Keyword, newNodeValue(0, "signed"), linesno); }
| UNSIGNED { $$ = newAstNode(Keyword, newNodeValue(0, "unsigned"), linesno); }
;
init_declarator_list /* 初始化列表 */
: init_declarator { $$ = $1; }
| init_declarator_list ',' init_declarator
{ $$ = newAstNode(Expression, newNodeValue(0, "init_declarator_list"), linesno);
AstNode *comma = newAstNode(Operator, newNodeValue(0, ","), linesno);
linkAstNode($$, $1, comma, $3, NULL); }
;
init_declarator
: declarator { $$ = $1; }
| declarator '=' initializer { $$ = newAstNode(Expression, newNodeValue(0, "init_declarator"), linesno);
AstNode *assign = newAstNode(Operator, newNodeValue(0, "="), linesno);
linkAstNode($$, $1, assign, $3, NULL); }
;
declarator /* 暂时只考虑了简单的变量声明 */
: IDENTIFIER { $$ = newAstNode(Identifier, newNodeValue(0, $1), linesno); }
;
initializer
: NUMBER { $$ = newAstNode(Number, newNodeValue(1, $1), linesno); }
| IDENTIFIER { $$ = newAstNode(Identifier, newNodeValue(0, $1), linesno); }
| CHARACTER { $$ = newAstNode(String, newNodeValue(0, $1), linesno); }
;
statement
: assignment_statement /* 赋值语句 */ { $$ = $1; }
| expression_statement /* 表达式语句 */ { $$ = $1; }
| selection_statement /* 选择语句 */ { $$ = $1; }
| iteration_statement /* 循环语句 */ { $$ = $1; }
| jump_statement /* 跳转语句 */ { $$ = $1; }
| compound_statement { $$ = $1; }
;
assignment_statement
: IDENTIFIER '=' expression ';' { $$ = newAstNode(Statement, newNodeValue(0, "assignment_statement"), linesno);
AstNode *identifier = newAstNode(Identifier, newNodeValue(0, $1), linesno);
AstNode *assign = newAstNode(Operator, newNodeValue(0, "="), linesno);
AstNode *semicolon = newAstNode(Operator, newNodeValue(0, ";"), linesno);
linkAstNode($$, identifier, assign, $3, semicolon, NULL); }
;
expression_statement
: expression ';' { $$ = newAstNode(Statement, newNodeValue(0, "expression_statement"), linesno);
AstNode *semicolon = newAstNode(Operator, newNodeValue(0, ";"), linesno);
linkAstNode($$, $1, semicolon, NULL); }
;
selection_statement
: IF '(' expression ')' compound_statement %prec LOWER_THAN_ELSE
{ $$ = newAstNode(Statement, newNodeValue(0, "selection_statement_no_else"), $3->linenumber);
$$->endlinenumber = $5->firstchild->linenumber;
AstNode *if_keyword = newAstNode(Keyword, newNodeValue(0, "if"), $3->linenumber);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), $3->linenumber);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), $3->linenumber);
linkAstNode($$, if_keyword, left_bracket, $3, right_bracket, $5, NULL); }
| IF '(' expression ')' compound_statement ELSE compound_statement
{ $$ = newAstNode(Statement, newNodeValue(0, "selection_statement_with_else"), $3->linenumber);
$$->endlinenumber = $7->firstchild->linenumber;
AstNode *if_keyword = newAstNode(Keyword, newNodeValue(0, "if"), $3->linenumber);
AstNode *else_keyword = newAstNode(Keyword, newNodeValue(0, "else"), $3->linenumber);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), $3->linenumber);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), $3->linenumber);
linkAstNode($$, if_keyword, left_bracket, $3, right_bracket, $5, else_keyword, $7, NULL); }
;
iteration_statement
: WHILE '(' expression ')' compound_statement
{ $$ = newAstNode(Statement, newNodeValue(0, "iteration_statement"), $3->linenumber);
$$->endlinenumber = $5->firstchild->linenumber;
AstNode *while_keyword = newAstNode(Keyword, newNodeValue(0, "while"), $3->linenumber);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), $3->linenumber);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), $3->linenumber);
linkAstNode($$, while_keyword, left_bracket, $3, right_bracket, $5, NULL); }
;
jump_statement
: RETURN ';' { $$ = newAstNode(Statement, newNodeValue(0, "jump_statement"), linesno);
AstNode *return_keyword = newAstNode(Keyword, newNodeValue(0, "return"), linesno);
AstNode *semicolon = newAstNode(Operator, newNodeValue(0, ";"), linesno);
linkAstNode($$, return_keyword, semicolon, NULL); }
| RETURN expression ';' { $$ = newAstNode(Statement, newNodeValue(0, "jump_statement"), linesno);
AstNode *return_keyword = newAstNode(Keyword, newNodeValue(0, "return"), linesno);
AstNode *semicolon = newAstNode(Operator, newNodeValue(0, ";"), linesno);
linkAstNode($$, return_keyword, $2, semicolon, NULL); }
;
translation_unit
: function_definition /*仅仅用来考虑无参main函数的，其他函数情况暂时没有考虑*/
{ ast_root = $1; }
;
function_definition
: type_name IDENTIFIER '(' ')' compound_statement
{ $$ = newAstNode(FunctionDefinition, newNodeValue(0, "function_definition"), $1->linenumber);
AstNode *identifier = newAstNode(Identifier, newNodeValue(0, $2), $1->linenumber);
AstNode *left_bracket = newAstNode(Operator, newNodeValue(0, "("), $1->linenumber);
AstNode *right_bracket = newAstNode(Operator, newNodeValue(0, ")"), $1->linenumber);
linkAstNode($$, $1, identifier, left_bracket, right_bracket, $5, NULL); }
;
compound_statement
: '{' '}' { $$ = newAstNode(FunctionDefinition, newNodeValue(0, "compound_statement"), linesno);
AstNode *big_left_bracket = newAstNode(Operator, newNodeValue(0, "{"), linesno);
AstNode *big_right_bracket = newAstNode(Operator, newNodeValue(0, "}"), linesno);
linkAstNode($$, big_left_bracket, big_right_bracket, NULL); }
| '{' block_item_list '}' { $$ = newAstNode(FunctionDefinition, newNodeValue(0, "compound_statement"), $2->linenumber-1);
AstNode *big_left_bracket = newAstNode(Operator, newNodeValue(0, "{"), linesno);
AstNode *big_right_bracket = newAstNode(Operator, newNodeValue(0, "}"), linesno);
linkAstNode($$, big_left_bracket, $2, big_right_bracket, NULL); }
;
block_item_list
: block_item { $$ = $1; }
| block_item_list block_item { $$ = newAstNode(FunctionDefinition, newNodeValue(0, "block_item_list"), $1->linenumber);
linkAstNode($$, $1, $2, NULL); }
;
block_item
: declaration { $$ = $1; }
| statement { $$ = $1; }
;
%%
void yyerror(char *s)
{
fflush(stdout);
fprintf(stderr, "Error: lines %d: %s\n", linesno, s);
}