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gramtree.y
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gramtree.y
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%{
#include<unistd.h>
#include<stdio.h>
#include "Ast.h"
#include "cds.h"
#include "c_container_auxiliary.h"
%}
%{
int yylex();
%}
//yylval
%union{
ast* a;
double d;
}
/*declare tokens*/
%token <a> INTEGER FLOAT
%token <a> TYPE CONST STRUCT RETURN IF ELSE WHILE ID SPACE SEMI COMMA ASSIGNOP BREAK CONTINUE
%token <a> GREAT GREATEQUAL LESS LESSEQUAL NOTEQUAL EQUAL
%token <a> PLUS MINUS STAR DIV MOD AND OR DOT NOT LP RP LB RB LC RC AERROR
%token <a> EOL
%type <a> Program ExtDefList ExtDef ExtDecList Specifire StructSpecifire TACList TAC InitList
OptTag Tag VarDec FunDec VarList ParamDec Compst StmtList Stmt DefList Def DecList Dec Exp Args
/*priority*/
%right ASSIGNOP
%left OR
%left AND
%left GREAT GREATEQUAL LESS LESSEQUAL NOTEQUAL EQUAL
%left PLUS MINUS
%left STAR DIV MOD
%right NOT
%left LP RP LB RB DOT
%%
Program:|ExtDefList {
$$=newast("Program",1,$1);
eval_print($$,0);
// printf("\nprint over\n");
eval($$);
}
;
ExtDefList:ExtDef ExtDefList {$$=newast("ExtDefList",2,$1,$2);}
| {$$=newast("ExtDefList",0,-1);}
;
//定义全局变量 int a,b[10],c;
/*定义全局结构体 struct myStruct
{
int a = 10;
int b,c;
int d = b + c;
}
或者
struct myStructWithout */
//定义函数 int main(int a,int b){}
ExtDef:Specifire ExtDecList SEMI {$$=newast("ExtDef",2,$1,$2);}
|Specifire SEMI {$$=newast("ExtDef",1,$1);}
|Specifire FunDec Compst {$$=newast("ExtDef",3,$1,$2,$3);}
;
//全局变量名
ExtDecList:Dec {$$=newast("ExtDecList",1,$1);}
|Dec COMMA ExtDecList {$$=newast("ExtDecList",2,$1,$3);}
;
//标识符
//int float
//struct
//返回值类型
/*Specifire*/
Specifire:TYPE {$$=newast("Specifire",1,$1);}
|StructSpecifire {$$=newast("Specifire",1,$1);}
|CONST TYPE {$$=newast("Specifire",2,$2,$1);}
;
/*结构体格式: struct myStruct
{
int a = 10;
int b,c;
int d = b + c;
}
或者
struct myStructWithout
*/
StructSpecifire:STRUCT OptTag LC DefList RC {$$=newast("StructSpecifire",5,$1,$2,$3,$4,$5);}
|STRUCT Tag {$$=newast("StructSpecifire",2,$1,$2);}
;
OptTag:ID {$$=newast("OptTag",1,$1);}
|{$$=newast("OptTag",0,-1);}
;
Tag:ID {$$=newast("Tag",1,$1);}
;
/*Declarators*/
//变量的声明
//格式:a a[10] a[]
VarDec:ID {$$=newast("VarDec",1,$1);}
| VarDec LB Exp RB {$$=newast("VarDec",3,$1,$2,$3);}
| VarDec LB RB {$$=newast("VarDec",2,$1,$2);}
;
//函数的声明
//格式: main(int a,int b)
FunDec:ID LP VarList RP {$$=newast("FunDec",4,$1,$2,$3,$4);}
|ID LP RP {$$=newast("FunDec",3,$1,$2,$3);}
;
//变量列表 声明单个变量的拼接 中间以逗号隔开
//格式:int a,int b
VarList:ParamDec COMMA VarList {$$=newast("VarList",2,$1,$3);}
|ParamDec {$$=newast("VarList",1,$1);}
;
//声明单个变量作为参数列表中的参数
//格式:int a
ParamDec:Specifire VarDec {$$=newast("ParamDec",2,$1,$2);}
;
/*Statement*/
//语句
//大括号基本块
/*
格式:
{
DefList:
int a = 10;
int b,c;
int d = b + c;
StmtList:
}
}
*/
//基本块
//格式:{定义、语句}
Compst:LC TACList RC {$$=newast("Compst",3,$1,$2,$3);}
;
//用于解决 定义 语句 定义的情况
TACList:TAC TACList {$$=newast("TACList",2,$1,$2);}
| {$$=newast("TACList",0,-1);}
;
TAC:DefList StmtList {$$=newast("TAC",2,$1,$2);}
;
//语句链推导出语句加语句链
StmtList:Stmt StmtList{$$=newast("StmtList",2,$1,$2);}
| {$$=newast("StmtList",0,-1);}
;
//语句推导
//1.表达式;
//2.{基本块};
//3.返回语句: return 表达式;
//4.if(表达式)语句::=>{基本块}
//5.if(表达式)语句::=>{基本块} else语句=>{基本块}
//6.while(表达式)语句::=>{基本块}
Stmt:Exp SEMI {$$=newast("Stmt",1,$1);}
|SEMI
|Compst {$$=newast("Stmt",1,$1);}
|RETURN Exp SEMI {$$=newast("Stmt",2,$1,$2);}
|BREAK SEMI{$$=newast("Stmt",1,$1);}
|CONTINUE SEMI{$$=newast("Stmt",1,$1);}
|IF LP Exp RP Stmt {$$=newast("Stmt",5,$1,$3,newast("assistIF",0,-1),$5,newast("assistELSE",0,-1));}
|IF LP Exp RP Stmt ELSE Stmt {$$=newast("Stmt",7,$1,$3,newast("assistIF",0,-1),$5,newast("assistELSE",0,-1),$6,$7);}
|WHILE LP Exp RP Stmt {$$=newast("Stmt",4,$1,$3,newast("assistWHILE",0,-1),$5);}
;
/*Local Definitions*/
//局部变量的声明
//格式:int a = m+n,b,c;float x,y,z;
DefList:Def DefList{$$=newast("DefList",2,$1,$2);}
| {$$=newast("DefList",0,-1);}
;
//格式:int a = m+n,b,c;
Def:Specifire DecList SEMI {$$=newast("Def",2,$1,$2);}
;
//格式: a = m+n , b, c
DecList:Dec COMMA DecList {$$=newast("DecList",2,$1,$3);}
|Dec {$$=newast("DecList",1,$1);}
;
// ASSIGNOP是等号
// VarDec 表示标识符或者数组 a、a[10]
// a 或者 a = 表达式
// a =10; a=b+c;
Dec:VarDec {$$=newast("Dec",1,$1);}
|VarDec ASSIGNOP Exp {$$=newast("Dec",3,$1,$2,$3);}
|VarDec ASSIGNOP LC InitList RC{$$=newast("Dec",3,$1,$2,$4);}
;
InitList:InitList COMMA InitList {$$=newast("InitList",3,$1,$2,$3);}
| LC InitList COMMA InitList RC {$$=newast("InitList",2,$2,$4);}
| Exp {$$=newast("InitList",1,$1);}
/*Expressions*/
Exp:Exp ASSIGNOP Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp = Exp
|Exp AND Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp && Exp
|Exp OR Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp || Exp
|Exp GREAT Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp > Exp
|Exp GREATEQUAL Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp >= Exp
|Exp LESS Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp < Exp
|Exp LESSEQUAL Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp <= Exp
|Exp NOTEQUAL Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp != Exp
|Exp EQUAL Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp == Exp
|Exp PLUS Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp + Exp
|Exp MINUS Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp - Exp
|Exp STAR Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp * Exp
|Exp DIV Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp / Exp
|Exp MOD Exp{$$=newast("Exp",3,$1,$2,$3);} // Exp % Exp
|LP Exp RP{$$=newast("Exp",1,$2);} // (Exp)
|MINUS Exp {$$=newast("Exp",2,$1,$2);} // -Exp
|PLUS Exp {$$=newast("Exp",2,$1,$2);} // +Exp
|NOT Exp {$$=newast("Exp",2,$1,$2);} // !Exp
|ID LP Args RP {$$=newast("Exp",3,newast("assistFuncCall",0,-1),$1,$3);}//带有参数的函数调用
|ID LP RP {$$=newast("Exp",2,newast("assistFuncCall",0,-1),$1);}//没有参数的函数调用
|Exp LB Exp RB {$$=newast("Exp",4,$1,$2,$3,$4);} // Exp[Exp] 数组求值
|Exp DOT ID {$$=newast("Exp",3,$1,$2,$3);} //Exp.ID 结构体调用结构体内部成员
|ID {$$=newast("Exp",1,$1);} // ID 变量
|INTEGER {$$=newast("Exp",1,$1);} //整形数字面量
|FLOAT{$$=newast("Exp",1,$1);} //浮点数字面量
;
//函数调用中的参数表达
Args:Exp COMMA Args {$$=newast("Args",3,$1,newast("assistArgs",0,-1),$3);}
|Exp {$$=newast("Args",2,$1,newast("assistArgs",0,-1));}
;
%%