?? yy.cpp

?? 簡單易用易看的編譯器帶詞法分析和語法分析輸出是二元式和四元式使用讀取文件的方式進行編譯功能基本完整
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#include "cifa.h"
#include "iostream.h"
#include "stdlib.h"
# define FALSE false 
# define TRUE true 
//FILE *fp1;
//fp1=fopen("sour.txt","r");
cifa c1(fopen("sour.txt","r"));
int qiantao=0;//錢掏變量
struct errorType
{
	int ErrorNumber;//語法語義錯誤代碼
	int ErrorAddress;//語義錯誤對應(yīng)二元式的地址
};

struct yujutype
{
	int Etyp;
	int Evalue;
	int TC;
	int FC;
	int Code;
};


struct idtype //標(biāo)識符表
{
	char name[20];//名字
	int typ;//類型1:integer,2:real,3:program or procedure name
	int kind;//屬性1:簡單變量,2:臨時變量,3:值參變量,4:變參變量
	int addr;//地址
};


struct leveltype //層次表
{
	char name[20];//名字
	int outern;//外層
	int lnum;//層次號
	int parnum;//參數(shù)個數(shù)
	int varnum;//變量個數(shù)
	int pointer;//標(biāo)識符表首址
	int recl;//活動記錄長度
	int temp;//臨時變量首址
	int lnp;//入口
};

struct temptype //
{
	bool used;//
	int typ;//
	int taddr;//
};

struct argtype //
{
	int fl;//類型1:常數(shù)2:指令入口3:臨時變量4:直接訪問變量5:間接訪問變量6+i:第i外層變量
	int flvalue;//值 常數(shù)值|指令地址|相對地址
};

struct quadtype //四元式表
{
	int op;//操作
	argtype arg1;//操作數(shù)
	argtype arg2;//操作數(shù)
	argtype result;//結(jié)果
};

struct quanjutype //變量
{
	int lasent;//標(biāo)識符表長度指針
	int lastbl;//層次表長度指針
	int currbl;//當(dāng)前層指針
	int tempp;//變量表藏度指針
	int nxq;//四元式表長度指針
};


    errorType errorvalue;
   yujutype yujuvalue;
    CifaResult  yy_tCifa[500];
   char yy_QuadOpCodeTable[30][10];
   char yy_tErrorMessage[100][30];
  int yy_pCurSym=0;
	void coutgen();
    void coutty();
  int merge(int,int,int);
	int newtemp(int);
	int lookupp(char *);
	int lookupv_onelevel(char *,int);
	void backpatch(int,int,int,int);
	void addid(char *,int,int,int);
	quanjutype quanjuvalue;
	void gen(char *,int,int,int,int,int,int);
	idtype idtab[10000];
	leveltype leveltab[100];
	temptype temptab[100];
	quadtype quad[10000];
	int yy_nErrorAddress;
	int yy_nErrorNum;
	CifaResult  GetNextSym();
	void NextSym();
	CifaResult  GetCurSym();
	void initial();
    int s_GuanXi();
	int s_GuanXiBiaoDaShi();
	int s_BuErBiaoDaShi();
	int s_YingZi();
	int s_Xiang();
	int s_BiaoDaShi();
	int s_XunHuanYuJu();
	int s_TiaoJianYuJu();
	int s_FuZhiYuJu();
	int s_FuHeYuJu();
	int s_YuJu();
	int s_YuJuChuan();
	int s_XingChan();
	int s_XingChanBuFeng();
	int s_JianBianShuoMing();
	int s_ShuoMing();
	int s_ShuoMingChuan();
	int s_ChengXuTi();
	int s_ChengXu();

void gen(char * op,int a1,int a2,int a3,int a4,int a5,int a6)
{
	if (quanjuvalue.nxq>=1000-1) return;
	int r=29;
	for (int i=0;i<1000;i++)
	{
		if (!stricmp(yy_QuadOpCodeTable[i],op))
		{
			r=i;break;
		}
	}
	quad[quanjuvalue.nxq].op=r;
	quad[quanjuvalue.nxq].arg1.fl=a1;
	quad[quanjuvalue.nxq].arg1.flvalue=a2;
	quad[quanjuvalue.nxq].arg2.fl=a3;
	quad[quanjuvalue.nxq].arg2.flvalue=a4;
	quad[quanjuvalue.nxq].result.fl=a5;
	quad[quanjuvalue.nxq].result.flvalue=a6;
	quanjuvalue.nxq++;
}

void addid(char * name, int typ, int kind, int addr)
{
	if (quanjuvalue.lasent>=1000-1) return;
	::strcpy(idtab[quanjuvalue.lasent].name,name);
	idtab[quanjuvalue.lasent].typ=typ;
	idtab[quanjuvalue.lasent].kind=kind;
	idtab[quanjuvalue.lasent].addr=addr;
	quanjuvalue.lasent++;
}
void backpatch(int link, int point, int v1, int v2)
{
	if (link==0) return;
	switch (point)
	{
	case 2:
		backpatch(quad[link].arg1.fl,point,v1,v2);
		quad[link].arg1.fl=v1;
		quad[link].arg1.flvalue=v2;
		break;
	case 3:
		backpatch(quad[link].arg2.fl,point,v1,v2);
		quad[link].arg2.fl=v1;
		quad[link].arg2.flvalue=v2;
		break;
	case 4:
		backpatch(quad[link].result.fl,point,v1,v2);
		quad[link].result.fl=v1;
		quad[link].result.flvalue=v2;
		break;
	default:
		return;
	}
}
int lookupp(char * id)
{
	for (int i=0;i<quanjuvalue.lastbl;i++)
		if (!::stricmp(id,leveltab[i].name)) return i;
	return -1;
}
int lookupv_onelevel(char * idname, int idlevel)//
{
	if (!::stricmp(idname,leveltab[idlevel].name)) return -1;
	int n=leveltab[idlevel].varnum+leveltab[idlevel].parnum;
	int pointer=leveltab[idlevel].pointer;
	for (int i=pointer;i<(pointer+n);i++)
		if (!::stricmp(idname,idtab[i].name)) return i;
	return 0;
}

int lookupv_alllevel(char * name, int & level)
{
	int i=level;
	int r;
	while(1)
	{
		if (i<0) return 0;
		r=lookupv_onelevel(name,i);
		switch (r)
		{
		case -1:
			level=i;
			return -1;
		case 0:
			i--;
			break;
		default:
			level=i;
			return r;
		}
	}
}



CifaResult  GetCurSym()
{
	return yy_tCifa[yy_pCurSym];
}

void NextSym()
{
	yy_pCurSym++;
}


CifaResult  GetNextSym()
{
	return yy_tCifa[yy_pCurSym+1];
}


    
int YuYiFengXi()
{
	
	quanjuvalue.currbl=0;
	quanjuvalue.lasent=0;
	quanjuvalue.lastbl=0;
	quanjuvalue.nxq=0;
	quanjuvalue.tempp=0;
	gen("",0,0,0,0,0,0);//idtab start from 1
	addid("",0,0,0);//idtab start from 1
	yy_pCurSym=0;
	if(!s_ChengXu()) return FALSE;
	gen("_End_",0,0,0,0,0,0);//end note
     return 1;
}


int s_ChengXu()
{
switch (GetCurSym().type)
	{
	case 3://program
		break;
	default:
		yy_nErrorNum=3;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
		
	NextSym();
	switch (GetCurSym().type)
	{
	case 1://id
		break;
	default:
		yy_nErrorNum=4;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
//yy
	//對層次的副直
	leveltab[quanjuvalue.currbl].lnp=quanjuvalue.nxq+1;
	//cout<<"fasdfas亂七八糟 "<<leveltab[quanjuvalue.currbl].lnp<<endl;
	leveltab[quanjuvalue.currbl].lnum=0;
	strcpy(leveltab[quanjuvalue.currbl].name,GetCurSym().text);
	leveltab[quanjuvalue.currbl].outern=0;
	leveltab[quanjuvalue.currbl].parnum=0;
	leveltab[quanjuvalue.currbl].pointer=quanjuvalue.lasent;
	leveltab[quanjuvalue.currbl].recl=5;
	leveltab[quanjuvalue.currbl].varnum=0;
	leveltab[quanjuvalue.currbl].temp=quanjuvalue.tempp;
	quanjuvalue.lastbl++;
	gen("call",1,0,1,0,2,2);
	int link=quanjuvalue.nxq;
	gen("in",0,0,0,0,0,0);
//yy end
	NextSym();
	switch (GetCurSym().type)
	{
	case 30://;
		break;
	default:
		yy_nErrorNum=5;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	
	if (!s_ChengXuTi()) return FALSE;
//yy
//	printf("餓我我哦我外哦我哦我我忘我歐文\n");
	backpatch(link,2,2,leveltab[quanjuvalue.currbl].recl);
	gen("out",0,0,0,0,0,0);
	gen("ret",0,0,0,0,0,0);
	quanjuvalue.currbl=leveltab[quanjuvalue.currbl].outern;
	quanjuvalue.tempp=leveltab[quanjuvalue.currbl].temp;
//yy end
	switch (GetCurSym().type)
	{
	case 31://.
		break;
	default:
		yy_nErrorNum=6;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
		
	return TRUE;
}

int s_ChengXuTi()
{
	switch (GetCurSym().type)
	{
	case 14://integer
	case 15://real
//	case 5://procedure程序不要過程
		if (!s_ShuoMingChuan()) return FALSE;
		switch (GetCurSym().type)
		{
		case 30://;
			break;
		default:
			yy_nErrorNum=5;
			yy_nErrorAddress=yy_pCurSym;
			return FALSE;
		}
		NextSym();
		break;
	case 6://begin
		break;
	default:
		yy_nErrorNum=7;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	switch (GetCurSym().type)
	{
	case 6://begin
		break;
	default:
		yy_nErrorNum=8;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	
	if (!s_YuJuChuan()) return FALSE;
	//cout<<"我愛我愛我愛我愛"<<endl;
	switch (GetCurSym().type)
	{
	case 7://end
		break;
	default:
		yy_nErrorNum=10;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	return TRUE;
}


int s_ShuoMingChuan()
{
	if (!s_ShuoMing()) return FALSE;
	while (GetCurSym().type==30 
		&& GetNextSym().type!=6)//; begin
	{
		NextSym();
		if (!s_ShuoMing()) return FALSE;
	}
	return TRUE;
}

int s_ShuoMing()
{
	switch (GetCurSym().type)
	{
	case 14://integer
	case 15://real
		if (!s_JianBianShuoMing()) return FALSE;
		break;
	//case 5://procedure
		//if (!s_GuoChengShuoMing()) return FALSE;
	//	break;
	default:
		yy_nErrorNum=11;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	return TRUE;
}

int s_JianBianShuoMing()
{
	int typ;//yy
	switch (GetCurSym().type)
	{
	case 14://integer
		typ=1;//yy
		break;
	case 15://real
		typ=2;//yy
		break;
	default:
		yy_nErrorNum=12;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	switch (GetCurSym().type)
	{
	case 1://id
		break;
	default:
		yy_nErrorNum=14;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
//yy
	switch (lookupv_onelevel(GetCurSym().text,quanjuvalue.currbl))
	{
	case -1:
		yy_nErrorNum=31;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	case 0:
		addid(GetCurSym().text,typ,1,leveltab[quanjuvalue.currbl].recl);
		leveltab[quanjuvalue.currbl].varnum++;
		leveltab[quanjuvalue.currbl].recl+=typ;
		break;
	default:
		yy_nErrorNum=32;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
//yy end
	NextSym();
	while (GetCurSym().type==32) //,
	{
		NextSym();
		switch (GetCurSym().type)
		{
		case 1://id
			break;
		default:
			yy_nErrorNum=14;
			yy_nErrorAddress=yy_pCurSym;
			return FALSE;
		}
//yy
		switch (lookupv_onelevel(GetCurSym().text,quanjuvalue.currbl))
		{
		case -1:
			yy_nErrorNum=31;
			yy_nErrorAddress=yy_pCurSym;
			return FALSE;
		case 0:
			addid(GetCurSym().text,typ,1,leveltab[quanjuvalue.currbl].recl);
			leveltab[quanjuvalue.currbl].varnum++;
			leveltab[quanjuvalue.currbl].recl+=typ;
			break;
		default:
			yy_nErrorNum=32;
			yy_nErrorAddress=yy_pCurSym;
			return FALSE;
		}
//yy end
		NextSym();
	}
	return TRUE;
}



int  s_YuJuChuan()
{
	if (!s_YuJu()) return FALSE;

	while (GetCurSym().type==30)//;
	{
		NextSym();
		if (!s_YuJu()) return FALSE;
	}
	cout<<"語句串結(jié)束"<<endl;
	return TRUE;
}

int  s_YuJu()
{
	switch (GetCurSym().type)
	{
	case 6://begin
		if (!s_FuHeYuJu()) return FALSE;
		break;
	case 1://id
		if (!s_FuZhiYuJu()) return FALSE;
		break;
	case 8://if
		if (!s_TiaoJianYuJu()) return FALSE;
		break;
	case 11://while
		if (!s_XunHuanYuJu()) return FALSE;
		break;
//	case 13://call
	//	if (!s_GuoChengYuJu()) return FALSE;
	//	break;
	default:
		yy_nErrorNum=9;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	return TRUE;
}

int  s_FuHeYuJu()
{
	switch (GetCurSym().type)
	{
	case 6://begin
		break;
	default:
		yy_nErrorNum=8;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	if (!s_YuJuChuan()) return FALSE;
	switch (GetCurSym().type)
	{
	case 7://end
		break;
	default:
		yy_nErrorNum=10;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	return TRUE;
}

int  s_FuZhiYuJu()
{
	switch (GetCurSym().type)
	{
	case 1://id
		break;
	default:
		yy_nErrorNum=20;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
//yy
	int idlevel=quanjuvalue.currbl;
	int idpoint=lookupv_alllevel(GetCurSym().text,idlevel);
	if (idpoint==0)
	{
		yy_nErrorNum=33;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	if (idpoint==-1)
	{
		yy_nErrorNum=34;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	int t1=idtab[idpoint].typ;
	int k1=idtab[idpoint].addr;
	int i1;
	if (idlevel==quanjuvalue.currbl)
	{
		if (idtab[idpoint].kind==4) i1=5;
		else i1=4;
	}
	else
	{
		i1=idlevel+6;
	}
//yy end
	NextSym();
	switch (GetCurSym().type)
	{
	case 29://:=
		break;
	default:
		yy_nErrorNum=21;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	if (!s_BiaoDaShi()) return FALSE;
//yy
	int t2;
	int k2;
	int i2=yujuvalue.Etyp;
	int j2=yujuvalue.Evalue;
	if (i2==1)
	{
		k2=j2;
		t2=1;
	}
	else if (i2==2)
	{
		k2=temptab[j2].taddr;
		t2=temptab[j2].typ;
		i2=3;
	}
	else
	{
		k2=idtab[j2].addr;
		t2=idtab[j2].typ;
		i2+=1;
	}
	if (t1<t2)
	{
		yy_nErrorNum=35;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	if (t1==1) gen(":=I",i1,k1,i2,k2,0,0);
	else gen(":=R",i1,k1,i2,k2,0,0);
	if (i2==3) temptab[j2].used=FALSE;
//yy end
	return TRUE;
}

int  s_TiaoJianYuJu()
{
	switch (GetCurSym().type)
	{
	case 8://if
		break;
	default:
		yy_nErrorNum=22;
		yy_nErrorAddress=yy_pCurSym;
		return FALSE;
	}
	NextSym();
	if (!s_BuErBiaoDaShi()) return FALSE;
//yy
	int TCexit=yujuvalue.TC;
	int FCexit=yujuvalue.FC;
	backpatch(TCexit,4,2,quanjuvalue.nxq);
//	cout<<"if語句的真出口"<<quanjuvalue.nxq<<endl;
//yy end
	switch (GetCurSym().type)
	{
	case 9://then
		break;
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