Newer
Older
%locations
%{
int yycolumn = 1;
#define YY_USER_ACTION \
yylloc.first_line = yylloc.last_line = yylineno; \
yylloc.first_column = yycolumn; \
yylloc.last_column = yycolumn + yyleng - 1; \
yycolumn += yyleng;
%}
#include "lex.yy.c"
void yyerror(char* s);
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/* declared tokens */
%token INT
%token FLOAT
%token ID
%token SEMI
%token COMMA
%token ASSIGNOP
%token RELOP
%token PLUS
%token MINUS
%token STAR
%token DIV
%token AND
%token OR
%token DOT
%token NOT
%token TYPE
/* TYPE -> int | float见下面 */
%token LP
%token RP
%token LB
%token RB
%token LC
%token RC
%token STRUCT
%token RETURN
%token IF
%token ELSE
%token WHILE
%%
/*High-level Definitions */
Program : ExtDefList
;
ExtDefList : ExtDef ExtDefList
|
;
ExtDef : Specifier ExtDecList SEMI
| Specifier SEMI
| Specifier FunDec CompSt
;
ExtDecList : VarDec
| VarDec COMMA ExtDecList
;
/*Specifier */
Specifier : TYPE
| StructSpecifier
;
StructSpecifier : STRUCT OptTag LC DefList RC
| STRUCT Tag
;
OptTag : ID
|
;
Tag : ID
/*Declarators */
VarDec : ID
| VarDec LB INT RB
;
FunDec : ID LP VarList RP
| ID LP RP
;
VarList : ParamDec COMMA VarList
| ParamDec
;
ParamDec : Specifier VarDec
;
/*Statements */
CompSt : LC DefList StmtList RC
;
StmtList : Stmt StmtList
|
;
Stmt : Exp SEMI
| CompSt
| RETURN Exp SEMI
| IF LP Exp RP Stmt
| IF LP Exp RP Stmt ELSE Stmt
| WHILE LP Exp RP Stmt
;
/*Local Definitions */
DefList : Def DefList
|
;
Def : Specifier DecList SEMI
;
DecList : Dec
| Dec COMMA DecList
;
Dec : VarDec
| VarDec ASSIGNOP Exp
/*Expressions */
Exp : Exp ASSIGNOP Exp
| Exp AND Exp
| Exp OR Exp
| Exp RELOP Exp
| Exp PLUS Exp
| Exp MINUS Exp
| Exp STAR Exp
| Exp DIV Exp
| LP Exp RP
| MINUS Exp
| NOT Exp
| ID LP Args RP
| ID LP RP
| Exp LB Exp RB
| Exp DOT ID
| ID
| INT
| FLOAT
;
Args : Exp COMMA Args
| Exp
;
%%