The version of basic copied from Martin Kerstens directory.
This commit is contained in:
285
lang/basic/src.old/symbols.c
Normal file
285
lang/basic/src.old/symbols.c
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#include "bem.h"
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/* Symboltable management module */
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int deftype[128]; /* default type declarer */
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/* which may be set by OPTION BASE */
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initdeftype()
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{
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int i;
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for(i='a';i<='z';i++) deftype[i]= DOUBLETYPE;
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for(i='A';i<='Z';i++) deftype[i]= DOUBLETYPE;
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}
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int indexbase=0; /* start of array subscripting */
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Symbol *firstsym = NIL;
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Symbol *alternate = NIL;
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Symbol *srchsymbol(str)
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char *str;
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{
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Symbol *s;
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/* search symbol table entry or create it */
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if(debug) printf("srchsymbol %s\n",str);
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s=firstsym;
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while(s)
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{
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if( strcmp(s->symname,str)==0) return(s);
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s= s->nextsym;
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}
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/* search alternate list */
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s=alternate;
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while(s)
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{
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if( strcmp(s->symname,str)==0) return(s);
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s= s->nextsym;
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}
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/* not found, create an emty slot */
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s= (Symbol *) salloc(sizeof(Symbol));
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s->symtype= DEFAULTTYPE;
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s->nextsym= firstsym;
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s->symname= (char *) salloc(strlen(str)+1);
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strcpy(s->symname,str);
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firstsym= s;
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if(debug) printf("%s allocated\n",str);
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return(s);
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}
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dcltype(s)
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Symbol *s;
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{
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/* type declarer */
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int type;
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if( s->isparam) return;
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type=s->symtype;
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if(type==DEFAULTTYPE)
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/* use the default rule */
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type= deftype[*s->symname];
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/* generate the emlabel too */
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if( s->symalias==0)
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s->symalias= dclspace(type);
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s->symtype= type;
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if(debug) printf("symbol set to %d\n",type);
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}
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dclarray(s)
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Symbol *s;
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{
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int i; int size;
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if( s->symtype==DEFAULTTYPE) s->symtype= DOUBLETYPE;
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if(debug) printf("generate space and descriptors for %d\n",s->symtype);
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if(debug) printf("dim %d\n",s->dimensions);
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s->symalias= genlabel();
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/* generate descriptors */
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size=1;
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for(i=0;i<s->dimensions;i++)
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s->dimalias[i]= genlabel();
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for(i=s->dimensions-1;i>=0;i--)
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{
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fprintf(emfile,"l%d\n rom %d,%d,%d*%s\n",
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s->dimalias[i],
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indexbase,
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s->dimlimit[i]-indexbase,
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size, typesize(s->symtype));
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size = size* (s->dimlimit[i]+1-indexbase);
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}
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if(debug) printf("size=%d\n",size);
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/* size of stuff */
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fprintf(emfile,"l%d\n bss %d*%s,0,1\n",
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s->symalias,size,typesize(s->symtype));
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/* Generate the range check descriptors */
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for( i= 0; i<s->dimensions;i++)
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fprintf(emfile,"r%d\n rom %d,%d\n",
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s->dimalias[i],
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indexbase,
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s->dimlimit[i]);
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}
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defarray(s)
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Symbol *s;
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{
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/* array is used without dim statement, set default limits */
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int i;
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for(i=0;i<s->dimensions;i++) s->dimlimit[i]=10;
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dclarray(s);
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}
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dclspace(type)
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{
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int nr;
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nr= genemlabel();
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switch( type)
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{
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case STRINGTYPE:
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fprintf(emfile," bss %s,0,1\n",EMPTRSIZE);
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break;
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case INTTYPE:
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fprintf(emfile," bss %s,0,1\n",EMINTSIZE);
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break;
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case FLOATTYPE:
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case DOUBLETYPE:
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fprintf(emfile," bss 8,0.0F %s,1\n",EMFLTSIZE);
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break;
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}
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return(nr);
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}
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/* SOME COMPILE TIME OPTIONS */
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optionbase(ival)
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int ival;
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{
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if( ival<0 || ival>1)
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error("illegal option base value");
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else indexbase=ival;
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}
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setdefaulttype(type)
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int type;
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{
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extern char *cptr;
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char first,last,i;
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/* handcrafted parser for letter ranges */
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if(debug) printf("deftype:%s\n",cptr);
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while( isspace(*cptr)) cptr++;
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if( !isalpha(*cptr))
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error("letter expected");
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first= *cptr++;
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if(*cptr=='-')
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{
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/* letter range */
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cptr++;
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last= *cptr;
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if( !isalpha(last))
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error("letter expected");
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else for(i=first;i<=last;i++) deftype[i]= type;
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cptr++;
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} else deftype[first]=type;
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if( *cptr== ',')
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{
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cptr++;
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setdefaulttype(type); /* try again */
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}
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}
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Symbol *fcn;
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newscope(s)
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Symbol *s;
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{
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if(debug) printf("new scope for %s\n",s->symname);
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alternate= firstsym;
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firstsym = NIL;
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fcn=s;
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s->isfunction=1;
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if( fcn->dimensions)
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error("Array redeclared");
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if( fcn->symtype== DEFAULTTYPE)
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fcn->symtype=DOUBLETYPE;
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}
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/* User defined functions */
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heading( )
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{
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char procname[50];
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sprintf(procname,"$_%s",fcn->symname);
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emcode("pro",procname);
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if( fcn->symtype== DEFAULTTYPE)
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fcn->symtype= DOUBLETYPE;
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}
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fcnsize(s)
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Symbol *s;
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{
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/* generate portable function size */
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int i;
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for(i=0;i<fcn->dimensions;i++)
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fprintf(tmpfile,"%s+",typesize(fcn->dimlimit[i]));
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fprintf(tmpfile,"0\n"); emlinecount++;
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}
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endscope(type)
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int type;
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{
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Symbol *s;
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if( debug) printf("endscope");
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conversion(type,fcn->symtype);
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emcode("ret", typestring(fcn->symtype));
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/* generate portable EM code */
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fprintf(tmpfile," end ");
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fcnsize(fcn);
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s= firstsym;
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while(s)
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{
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firstsym = s->nextsym;
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free(s);
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s= firstsym;
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}
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firstsym= alternate;
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alternate = NIL;
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fcn=NIL;
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}
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dclparm(s)
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Symbol *s;
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{
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int i,size=0;
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if( s->symtype== DEFAULTTYPE)
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s->symtype= DOUBLETYPE;
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s->isparam=1;
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fcn->dimlimit[fcn->dimensions]= s->symtype;
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fcn->dimensions++;
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/*
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OLD STUFF
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for(i=fcn->dimensions;i>0;i--)
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fcn->dimalias[i]= fcn->dimalias[i-1];
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*/
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/*fcn->parmsize += typesize(s->symtype);*/
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/* fcn->dimalias[0]= -typesize(s->symtype)-fcn->dimalias[1];*/
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s->symalias= -fcn->dimensions;
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if( debug) printf("parameter %d offset %d\n",fcn->dimensions-1,-size);
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}
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/* unfortunately function calls have to be stacked as well */
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#define MAXNESTING 50
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Symbol *fcntable[MAXNESTING];
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int fcnindex= -1;
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fcncall(s)
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Symbol *s;
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{
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if( !s->isfunction)
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error("Function not declared");
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else{
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fcn= s;
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fcnindex++;
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fcntable[fcnindex]=s;
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}
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}
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fcnend(fcntype, parmcount)
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int fcntype, parmcount;
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{
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int type;
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/* check number of arguments */
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if( parmcount <fcn->dimensions)
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error("not enough parameters");
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if( parmcount >fcn->dimensions)
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error("too many parameters");
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fprintf(tmpfile," cal $_%s\n",fcn->symname);
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emlinecount++;
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fprintf(tmpfile," asp ");
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fcnsize(fcn);
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emcode("lfr",typestring(fcn->symtype));
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type= fcn->symtype;
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fcnindex--;
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if( fcnindex>=0)
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fcn= fcntable[fcnindex];
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return(type);
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}
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callparm(ind,type)
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int ind,type;
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{
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if( fcnindex<0) error("unexpected parameter");
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if( ind >= fcn->dimensions)
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error("too many parameters");
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else
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conversion(type,fcn->dimlimit[ind]);
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}
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