最新用C语言写的PL0编译器《编译原理第二版》清华大学出版社.docx
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最新用C语言写的PL0编译器《编译原理第二版》清华大学出版社.docx
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最新用C语言写的PL0编译器《编译原理第二版》清华大学出版社
/*
测试用的程序:
consta=10;
varb,c;
procedurep;
begin
c:
=b+a
end;
begin
read(b);
whileb#0do
begin
callp;write(2*c);read(b);
end
end.
*/
#include
/*#include"pl0.h"*/
#include"string.h"
/*PL/0编译系统C版本头文件pl0.h*/
/*typedefenum{false,true}bool;*/
#definenorw13
#definetxmax100
#definenmax14
#defineal10
#defineamax2047
#definelevmax3
#definecxmax200
enumsymbol{
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,
};
#definesymnum32
enumobject{
constant,
variable,
procedur,
};
enumfct{
lit,opr,lod,sto,cal,inte,jmp,jpc,
};
#definefctnum8
structinstruction
{
enumfctf;
intl;
inta;
};
FILE*fas;
FILE*fa;
FILE*fa1;
FILE*fa2;
boollistswitch;
booltableswitch;
charch;
enumsymbolsym;
charid[al+1];
intnum;
intcc,ll;
intcx;
charline[81];
chara[al+1];
structinstructioncode[cxmax];
charword[norw][al];
enumsymbolwsym[norw];
enumsymbolssym[256];
charmnemonic[fctnum][5];
booldeclbegsys[symnum];
boolstatbegsys[symnum];
boolfacbegsys[symnum];
structtablestruct
{
charname[al];
enumobjectkind;
intval;
intlevel;
intadr;
intsize;
};
structtablestructtable[txmax];
FILE*fin;
FILE*fout;
charfname[al];
interr;
#definegetsymdoif(-1==getsym())return-1
#definegetchdoif(-1==getch())return-1
#definetestdo(a,b,c)if(-1==test(a,b,c))return-1
#definegendo(a,b,c)if(-1==gen(a,b,c))return-1
#defineexpressiondo(a,b,c)if(-1==expression(a,b,c))return-1
#definefactordo(a,b,c)if(-1==factor(a,b,c))return-1
#definetermdo(a,b,c)if(-1==term(a,b,c))return-1
#defineconditiondo(a,b,c)if(-1==condition(a,b,c))return-1
#definestatementdo(a,b,c)if(-1==statement(a,b,c))return-1
#defineconstdeclarationdo(a,b,c)if(-1==constdeclaration(a,b,c))return-1
#definevardeclarationdo(a,b,c)if(-1==vardeclaration(a,b,c))return-1
voiderror(intn);
intgetsym();
intgetch();
voidinit();
intgen(enumfctx,inty,intz);
inttest(bool*s1,bool*s2,intn);
intinset(inte,bool*s);
intaddset(bool*sr,bool*s1,bool*s2,intn);
intsubset(bool*sr,bool*s1,bool*s2,intn);
intmulset(bool*sr,bool*s1,bool*s2,intn);
intblock(intlev,inttx,bool*fsys);
voidinterpret();
intfactor(bool*fsys,int*ptx,intlev);
intterm(bool*fsys,int*ptx,intlev);
intcondition(bool*fsys,int*ptx,intlev);
intexpression(bool*fsys,int*ptx,intlev);
intstatement(bool*fsys,int*ptx,intlev);
voidlistcode(intcx0);
intvardeclaration(int*ptx,intlev,int*pdx);
intconstdeclaration(int*ptx,intlev,int*pdx);
intposition(char*idt,inttx);
voidenter(enumobjectk,int*ptx,intlev,int*pdx);
intbase(intl,int*s,intb);
#definestacksize500
intmain()
{
boolnxtlev[symnum];
printf("Inputpl/0file?
");
scanf("%s",fname);
fin=fopen(fname,"r");
if(fin)
{
printf("Listobjectcode?
(Y/N)");
scanf("%s",fname);
listswitch=(fname[0]=='y'||fname[0]=='Y');
printf("Listsymboltable?
(Y/N)");
scanf("%s",fname);
tableswitch=(fname[0]=='y'||fname[0]=='Y');
fa1=fopen("fa1.tmp","w");
fprintf(fa1,"Inputpl/0file?
");
fprintf(fa1,"%s\n",fname);
init();
err=0;
cc=cx=ll=0;
ch='';
if(-1!
=getsym())
{
fa=fopen("fa.tmp","w");
fas=fopen("fas.tmp","w");
addset(nxtlev,declbegsys,statbegsys,symnum);
nxtlev[period]=true;
if(-1==block(0,0,nxtlev))
{
fclose(fa);
fclose(fa1);
fclose(fas);
fclose(fin);
printf("\n");
return0;
}
fclose(fa);
fclose(fa1);
fclose(fas);
if(sym!
=period)
{
error(9);
}
if(err==0)
{
fa2=fopen("fa2.tmp","w");
interpret();
fclose(fa2);
}
else
{
printf("Errorsinpl/0program");
}
}
fclose(fin);
}
else
{
printf("Can'topenfile!
\n");
}
printf("\n");
return0;
}
voidinit()
{
inti;
for(i=0;i<=255;i++)
{
ssym[i]=nul;
}
ssym['+']=plus;
ssym['-']=minus;
ssym['*']=times;
ssym['/']=slash;
ssym['(']=lparen;
ssym[')']=rparen;
ssym['=']=eql;
ssym[',']=comma;
ssym['.']=period;
ssym['#']=neq;
ssym[';']=semicolon;
strcpy(&(word[0][0]),"begin");
strcpy(&(word[1][0]),"call");
strcpy(&(word[2][0]),"const");
strcpy(&(word[3][0]),"do");
strcpy(&(word[4][0]),"end");
strcpy(&(word[5][0]),"if");
strcpy(&(word[6][0]),"odd");
strcpy(&(word[7][0]),"procedure");
strcpy(&(word[8][0]),"read");
strcpy(&(word[9][0]),"then");
strcpy(&(word[10][0]),"var");
strcpy(&(word[11][0]),"while");
strcpy(&(word[12][0]),"write");
wsym[0]=beginsym;
wsym[1]=callsym;
wsym[2]=constsym;
wsym[3]=dosym;
wsym[4]=endsym;
wsym[5]=ifsym;
wsym[6]=oddsym;
wsym[7]=procsym;
wsym[8]=readsym;
wsym[9]=thensym;
wsym[10]=varsym;
wsym[11]=whilesym;
wsym[12]=writesym;
strcpy(&(mnemonic[lit][0]),"lit");
strcpy(&(mnemonic[opr][0]),"opr");
strcpy(&(mnemonic[lod][0]),"lod");
strcpy(&(mnemonic[sto][0]),"sto");
strcpy(&(mnemonic[cal][0]),"cal");
strcpy(&(mnemonic[inte][0]),"int");
strcpy(&(mnemonic[jmp][0]),"jmp");
strcpy(&(mnemonic[jpc][0]),"jpc");
for(i=0;i { declbegsys[i]=false; statbegsys[i]=false; facbegsys[i]=false; } declbegsys[constsym]=true; declbegsys[varsym]=true; declbegsys[procsym]=true; statbegsys[beginsym]=true; statbegsys[callsym]=true; statbegsys[ifsym]=true; statbegsys[whilesym]=true; facbegsys[ident]=true; facbegsys[number]=true; facbegsys[lparen]=true; } intinset(inte,bool*s) { returns[e]; } intaddset(bool*sr,bool*s1,bool*s2,intn) { inti; for(i=0;i { sr[i]=s1[i]||s2[i]; } return0; } intsubset(bool*sr,bool*s1,bool*s2,intn) { inti; for(i=0;i { sr[i]=s1[i]&&(! s2[i]); } return0; } intmulset(bool*sr,bool*s1,bool*s2,intn) { inti; for(i=0;i { sr[i]=s1[i]&&s2[i]; } return0; } voiderror(intn) { charspace[81]; memset(space,32,81); space[cc-1]=0; printf("****%s! %d\n",space,n); fprintf(fa1,"****%s! %d\n",space,n); err++; } intgetch() { if(cc==ll) { if(feof(fin)) { printf("programincomplete"); return-1; } ll=0; cc=0; printf("%d",cx); fprintf(fa1,"%d",cx); ch=''; while(ch! =10) { if(EOF==fscanf(fin,"%c",&ch)) { line[ll]=0; break; } printf("%c",ch); fprintf(fa1,"%c",ch); line[ll]=ch; ll++; } printf("\n"); fprintf(fa1,"\n"); } ch=line[cc]; cc++; return0; } intgetsym() { inti,j,k; while(ch==''||ch==10||ch==9) { getchdo; } if(ch>='a'&&ch<='z') { k=0; do{ if(k { a[k]=ch; k++; } getchdo; }while(ch>='a'&&ch<='z'||ch>='0'&&ch<='9'); a[k]=0; strcpy(id,a); i=0; j=norw-1; do{ k=(i+j)/2; if(strcmp(id,word[k])<=0) { j=k-1; } if(strcmp(id,word[k])>=0) { i=k+1; } }while(i<=j); if(i-1>j) { sym=wsym[k]; } else { sym=ident; } } else { if(ch>='0'&&ch<='9') { k=0; num=0; sym=number; do{ num=10*num+ch-'0'; k++; getchdo; }while(ch>='0'&&ch<='9'); k--; if(k>nmax) { error(30); } } else { if(ch==': ') { getchdo; if(ch=='=') { sym=becomes; getchdo; } else { sym=nul; } } else { if(ch=='<') { getchdo; if(ch=='=') { sym=leq; getchdo; } else { sym=lss; } } else { if(ch=='>') { getchdo; if(ch=='=') { sym=geq; getchdo; } else { sym=gtr; } } else { sym=ssym[ch]; if(sym! =period) { getchdo; } } } } } } return0; } intgen(enumfctx,inty,intz) { if(cx>=cxmax) { printf("Programtoolong"); return-1; } code[cx].f=x; code[cx].l=y; code[cx].a=z; cx++; return0; } inttest(bool*s1,bool*s2,intn) { if(! inset(sym,s1)) { error(n); while((! inset(sym,s1))&&(! inset(sym,s2))) { getsymdo; } } return0; } intblock(intlev,inttx,bool*fsys) { inti; intdx; inttx0; intcx0; boolnxtlev[symnum]; dx=3; tx0=tx; table[tx].adr=cx; gendo(jmp,0,0); if(lev>levmax) { error(32); } do{ if(sym==constsym) { getsymdo; do{ constdeclarationdo(&tx,lev,&dx); while(sym==comma) { getsymdo; constdeclarationdo(&tx,lev,&dx); } if(sym==semicolon) { getsymdo; } else { error(5); } }while(sym==ident); } if(sym==varsym) { getsymdo; do{ vardeclarationdo(&tx,lev,&dx); while(sym==comma) { getsymdo; vardeclarationdo(&tx,lev,&dx); } if(sym==semicolon) { getsymdo; } else { error(5); } }while(sym==ident); } while(sym==procsym) { getsymdo; if(sym==ident) { enter(procedur,&tx,lev,&dx); getsymdo; } else { error(4); } if(sym==semicolon) { getsymdo; } else { error(5); } memcpy(nxtlev,fsys,sizeof(bool)*symnum); nxtlev[semicolon]=true; if(-1==block(lev+1,tx,nxtlev)) { return-1; } if(sym==semicolon) { getsymdo; memcpy(nxtlev,statbegsys,sizeof(bool)*symnum); nxtlev[ident]=true; nxtlev[procsym]=true; testdo(nxtlev,fsys,6); } else { error(5); } } memcpy(nxtlev,statbegsys,sizeof(bool)*symnum); nxtlev[ident]=true; nxtlev[period]=true; testdo(nxtlev,declbegsys,7); }while(inset(sym,dec
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