unit1.cpp

编译原理课程设计

/*** PL0 COMPILER WITH CODE GENERATION ***/
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
const  AL    =  10;  /* LENGTH OF IDENTIFIERS */
const  NORW  =  20;  /* # OF RESERVED WORDS */
const  TXMAX = 100;  /* LENGTH OF IDENTIFIER TABLE */
const  NMAX  =  14;  /* MAX NUMBER OF DEGITS IN NUMBERS */
const  AMAX  =2047;  /* MAXIMUM ADDRESS */
const  LEVMAX=   3;  /* MAX DEPTH OF BLOCK NESTING */
const  CXMAX = 200;  /* SIZE OF CODE ARRAY */
int TYPE[500];//用于记录类型的listcode()的代码输出
typedef enum  { NUL, IDENT, NUMBER, PLUS, MINUS, TIMES,
	            SLASH, ODDSYM, EQL, NEQ, LSS, LEQ, GTR, GEQ,
	            LPAREN, RPAREN, COMMA, SEMICOLON, PERIOD,
	            BECOMES, BEGINSYM, ENDSYM, IFSYM, THENSYM,
	            WHILESYM, WRITESYM, READSYM, DOSYM, CALLSYM,
	            CONSTSYM, VARSYM, PROCSYM, PROGSYM,
                     //实验添加
                    ELSESYM,REPEATSYM,DOWHILESYM, RETURNSYM,
                    INC,DEC,PLUSEQ, MINUSEQ ,CHARSYM, REALSYM/*字符，实数类型*/
               } SYMBOL;
char *SYMOUT[] = {"NUL", "IDENT", "NUMBER", "PLUS", "MINUS", "TIMES",
	    "SLASH", "ODDSYM", "EQL", "NEQ", "LSS", "LEQ", "GTR", "GEQ",
	    "LPAREN", "RPAREN", "COMMA", "SEMICOLON", "PERIOD",
	    "BECOMES", "BEGINSYM", "ENDSYM", "IFSYM", "THENSYM",
	    "WHILESYM", "WRITESYM", "READSYM", "DOSYM", "CALLSYM",
	    "CONSTSYM", "VARSYM", "PROCSYM", "PROGSYM",
            //实验添加
            "ELSESYM","REPEATSYM","DOWHILESYM","RETURNSYM",
            "INC","DEC","PLUSEQ","MINUSEQ" ,"CHARSYM", "REALSYM"/*字符，实数类型*/
 };                
typedef  int *SYMSET; // SET OF SYMBOL;
typedef  char ALFA[11];
/*****************添加字符CHARV型和实型REAL*******************/
typedef  enum { CONSTANT, VARIABLE, PROCEDUR, CHARV, REAL } OBJECTS ;
typedef  enum { LIT, OPR, LOD, STO, CAL, INI, JMP, JPC } FCT;
/***************将指令操作数据类型扩展************************/
typedef struct {
	 FCT F;     /*FUNCTION CODE*/
	 int L; 	/*0..LEVMAX  LEVEL*/
	 union {
               int i;
               char ch;
               double d;
               }A;
} INSTRUCTION;
	  /* LIT O A -- LOAD CONSTANT A             */
	  /* OPR 0 A -- EXECUTE OPR A               */
	  /* LOD L A -- LOAD VARIABLE L,A           */
	  /* STO L A -- STORE VARIABLE L,A          */
	  /* CAL L A -- CALL PROCEDURE A AT LEVEL L */
	  /* INI 0 A -- INCREMET T-REGISTER BY A    */
	  /* JMP 0 A -- JUMP TO A                   */
	  /* JPC 0 A -- JUMP CONDITIONAL TO A       */


char   CH;  /*LAST CHAR READ*/
SYMBOL SYM; /*LAST SYMBOL READ*/
ALFA   ID;  /*LAST IDENTIFIER READ*/
int    NUM; /*LAST NUMBER READ*/
int    CC;  /*CHARACTER COUNT*/
int    LL;  /*LINE LENGTH*/
int    CX;  /*CODE ALLOCATION INDEX*/
char   LINE[81];
INSTRUCTION  CODE[CXMAX];
ALFA    KWORD[NORW+1];
SYMBOL  WSYM[NORW+1];
SYMBOL  SSYM['^'+1];
ALFA    MNEMONIC[9];
SYMSET  DECLBEGSYS, STATBEGSYS, FACBEGSYS;

struct {
  ALFA NAME;
  OBJECTS KIND;
  union {
    int VAL;   /*CONSTANT*/
    struct { int LEVEL,ADR,SIZE; } vp;  /*VARIABLE,PROCEDUR:*/
  };
} TABLE[TXMAX];

FILE *FIN,*FOUT;
int ERR;

void EXPRESSION(SYMSET FSYS, int LEV, int &TX);
void TERM(SYMSET FSYS, int LEV, int &TX);
//---------------------------------------------------------------------------
int SymIn(SYMBOL SYM, SYMSET S1) {
  return S1[SYM];
}
//---------------------------------------------------------------------------
SYMSET SymSetUnion(SYMSET S1, SYMSET S2) {
  SYMSET S=(SYMSET)malloc(sizeof(int)*43);
  for (int i=0; i<43; i++)
	if (S1[i] || S2[i]) S[i]=1;
	else S[i]=0;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetAdd(SYMBOL SY, SYMSET S) {
  SYMSET S1;
  S1=(SYMSET)malloc(sizeof(int)*43);
  for (int i=0; i<43; i++) S1[i]=S[i];
  S1[SY]=1;
  return S1;
}
//---------------------------------------------------------------------------
SYMSET SymSetNew(SYMBOL a) {
  SYMSET S; int i,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  S[a]=1;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetNew(SYMBOL a, SYMBOL b) {
  SYMSET S; int i,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  S[a]=1;  S[b]=1;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetNew(SYMBOL a, SYMBOL b, SYMBOL c) {
  SYMSET S; int i,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  S[a]=1;  S[b]=1; S[c]=1;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetNew(SYMBOL a, SYMBOL b, SYMBOL c, SYMBOL d) {
  SYMSET S; int i,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  S[a]=1;  S[b]=1; S[c]=1; S[d]=1;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetNew(SYMBOL a, SYMBOL b, SYMBOL c, SYMBOL d,SYMBOL e) {
  SYMSET S; int i,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  S[a]=1;  S[b]=1; S[c]=1; S[d]=1; S[e]=1;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetNew(SYMBOL a, SYMBOL b, SYMBOL c, SYMBOL d,SYMBOL e, SYMBOL f) {
  SYMSET S; int i,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  S[a]=1;  S[b]=1; S[c]=1; S[d]=1; S[e]=1; S[f]=1;
  return S;
}
//---------------------------------------------------------------------------
SYMSET SymSetNULL() {
  SYMSET S; int i,n,k;
  S=(SYMSET)malloc(sizeof(int)*43);
  for (i=0; i<43; i++) S[i]=0;
  return S;
}
//---------------------------------------------------------------------------
void Error(int n) {
  String s = "***"+AnsiString::StringOfChar(' ', CC-1)+"^";
  Form1->printls(s.c_str(),n);   fprintf(FOUT,"%s%d\n", s.c_str(), n);
  ERR++;
} /*Error*/
//---------------------------------------------------------------------------
void GetCh() {
  if (CC==LL) {
    if (feof(FIN)) {
	  Form1->printfs("PROGRAM INCOMPLETE");
	  fprintf(FOUT,"PROGRAM INCOMPLETE\n");
	  fclose(FOUT);
	  exit(0);
	}
	LL=0; CC=0;
	CH=' ';
	while (!feof(FIN) && CH!=10)
      { CH=fgetc(FIN);  LINE[LL++]=CH; }
	LINE[LL-1]=' ';  LINE[LL]=0;
    String s=IntToStr(CX);
    while(s.Length()<3) s=" "+s;
    s=s+" "+LINE;
	Form1->printfs(s.c_str());
    fprintf(FOUT,"%s\n",s);
  }
  CH=LINE[CC++];
} /*GetCh()*/
//---------------------------------------------------------------------------
void GetSym() {
  int i,J,K;   ALFA  A;
  while (CH<=' ') GetCh();
  if (CH>='A' && CH<='Z') { /*ID OR RESERVED WORD*/
    K=0;
	do {
	  if (K<AL) A[K++]=CH;
	  GetCh();
	}while((CH>='A' && CH<='Z')||(CH>='0' && CH<='9')||(CH=='['||CH==']'));
	A[K]='\0';
	strcpy(ID,A); i=1; J=NORW;
	do {
	  K=(i+J) / 2;
	  if (strcmp(ID,KWORD[K])<=0) J=K-1;
	  if (strcmp(ID,KWORD[K])>=0) i=K+1;
	}while(i<=J);
	if (i-1 > J) SYM=WSYM[K];
	else SYM=IDENT;
  }
  else
    if (CH>='0' && CH<='9') { /*NUMBER*/
      K=0; NUM=0; SYM=NUMBER;
	  do {
	    NUM=10*NUM+(CH-'0');
		K++; GetCh();
      }while(CH>='0' && CH<='9');
	  if (K>NMAX) Error(30);
    }
    else
      if (CH==':') {
	    GetCh();
		if (CH=='=') { SYM=BECOMES; GetCh(); }
		else SYM=NUL;
      }
	  else /* THE FOLLOWING TWO CHECK WERE ADDED
	         BECAUSE ASCII DOES NOT HAVE A SINGLE CHARACTER FOR <= OR >= */
	    if (CH=='<') {
		  GetCh();
		  if (CH=='=') { SYM=LEQ; GetCh(); }
                  else if (CH=='>') { SYM=NEQ; GetCh(); }  
                  else SYM=LSS;
                         }
		else
		  if (CH=='>') {
		    GetCh();
			if (CH=='=') { SYM=GEQ; GetCh(); }
			else SYM=GTR;
          }

/********************课程设计添加内容******************************/
    else//    ++和+=
        if(CH=='+') {
                GetCh();
                if (CH=='+'){SYM =INC; GetCh();} //如果是 '++'
                else if (CH=='='){SYM=PLUSEQ; GetCh();}//如果是否 '+='
                else SYM=PLUS; //否则是 '+'
                } //else if
   else //    --和-=
        if(CH=='-'){
                GetCh();
                if(CH=='-'){SYM=DEC; GetCh(); }//如果是 '--'
                else if(CH=='='){SYM=MINUSEQ; GetCh(); }//如果是 '-='
                else SYM=MINUS; //否则是 '-'
                }//else if

     else { SYM=SSYM[CH]; GetCh(); }
} /*GetSym()*/
//---------------------------------------------------------------------------
void GEN(FCT X, int Y, int Z) {
  if (CX>CXMAX) {
    Form1->printfs("PROGRAM TOO LONG");
	fprintf(FOUT,"PROGRAM TOO LONG\n");
	fclose(FOUT);
    exit(0);
  }
  CODE[CX].F=X; CODE[CX].L=Y; CODE[CX].A.i=Z; TYPE[CX]=VARIABLE;
  CX++;
} /*GEN*/
void GEN(FCT X, int Y, char Z) {
  if (CX>CXMAX) {
    Form1->printfs("PROGRAM TOO LONG");
	fprintf(FOUT,"PROGRAM TOO LONG\n");
	fclose(FOUT);
    exit(0);
  }
  CODE[CX].F=X; CODE[CX].L=Y; CODE[CX].A.ch=Z;TYPE[CX]=CHARV;
  CX++;
} /*GEN*/
void GEN(FCT X, int Y, double Z) {
  if (CX>CXMAX) {
    Form1->printfs("PROGRAM TOO LONG");
	fprintf(FOUT,"PROGRAM TOO LONG\n");
	fclose(FOUT);
    exit(0);
  }
  CODE[CX].F=X; CODE[CX].L=Y; CODE[CX].A.d=Z;TYPE[CX]=REAL;
  CX++;
} /*GEN*/
//---------------------------------------------------------------------------
void TEST(SYMSET S1, SYMSET S2, int N) {
  if (!SymIn(SYM,S1)) {
    Error(N);
	while (!SymIn(SYM,SymSetUnion(S1,S2))) GetSym();
  }
} /*TEST*/
//---------------------------------------------------------------------------
void ENTER(OBJECTS K, int LEV, int &TX, int &DX) { /*ENTER OBJECT INTO TABLE*/
  TX++;
  strcpy(TABLE[TX].NAME,ID); TABLE[TX].KIND=K;
  switch (K) {
	case CONSTANT:
	       if (NUM>AMAX) { Error(31); NUM=0; }
	       TABLE[TX].VAL=NUM;
	       break;
        case VARIABLE:
	       TABLE[TX].vp.LEVEL=LEV; TABLE[TX].vp.ADR=DX; DX++;
	       break;
        case PROCEDUR: