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com68k.c
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com68k.c
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// COM68K.C: Simple C compiler
// Generates 68000 assembly language
// Version 2.1: Added array handling.
// Version 2.0: Pass-by-value function paramerters working.
// Version 1.0: First version, no arrays or function parameters
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define FALSE 0
#define TRUE 1
#define BACKUP 2
#define NORMAL 3
// tVOID, tMAIN, etc.
#define NUMRESWRD 23
#define match(y) (ctoken == (y))
// char singles[] = "!&;{},=:()[]?'\"\\+-*/;><";
// char doubles[] = "*= /= %= += -= || && == != <= >= << >> ++ -- //";
enum tokens {LNOT, ADDR, SEMI, LBRACE, RBRACE, COMMA, ASSIGN, COLON,
LPAREN, RPAREN, LBRACKET, RBRACKET, QMARK, SQUOTE,
DQUOTE, FSLASH, PLUSOP, MINUSOP, TIMESOP, DIVOP,
LTHAN, GTHAN, TIMESEQ,
DIVEQ, MODEQ, PLUSEQ, MINUSEQ,
LOGICOR, LOGICAND, EQUAL, NOTEQUAL, LESSEQ, GREQ, SHIFTL,
SHIFTR, PLUSPLUS, MINUSMINUS, COMMENT, NOTOKEN,
tVOID, tMAIN, tINT, tCHAR,
tUNSIGNED, tIF, tELSE, tRETURN,
tDO, tWHILE, tSWITCH, tCASE,
tBREAK, tDEFAULT, tPRINTF, tNULL, tATOI,
tSCANF, tEXIT, tGETS, tSTRLEN, tGETCHAR, tASM,
ALPHA, NUMBER, CHAR, STRING, OTHER, EOIF};
enum tokens ctokengl;
enum tokens ctoken2gl;
char tokenstrgl[33],fcnbak[33];
enum tokens GetToken(void);
void PreMainStuff(void);
void PostMainStuff(void);
void fatal(char *msg);
void ProcessFunctionBody(int tmode, enum tokens tok, char ts[]);
int GetParmList(int fnum, char p1type, char p1name[]);
int CheckParmList(int fnum);
void ProcessGlobals(void);
void ProcessLocalVars(int fnum);
void ShowFunctionStats(void);
void EatSemi(void);
int isFunction(char fcn[]);
int isGlobal(char tok[]);
int isLocal(char fcn[], char tok[]);
void LoadLibs(void);
void ParseLocalVars(int fn);
void ReadVar(char fcn[], char tok[]);
void WriteVar(char fcn[], char tok[]);
int isArray(char fcn[], char var[]);
FILE *srcfile;
char srcname[32];
FILE *asmfile;
char asmname[32];
char input[132];
char tokenstr[132];
char *rwords[] = {"void", "main", "int", "char",
"unsigned", "if", "else", "return",
"do", "while", "switch", "case",
"break", "default", "printf", "NULL",
"atoi", "scanf", "exit", "gets", "strlen",
"getchar", "asm"};
int pfs;
int glvars,currglobal;
struct
{
char mode;
char type;
char name[33];
int size;
} globals[10];
int functs,currfn,currparm;
struct
{
char mode;
char type;
char name[33];
int nparms;
int defined;
struct
{
char mode;
char type;
char name[33];
} parms[4];
} fn[10];
int nlocals,currlocal;
char localfn[33];
struct
{
char mode;
char type;
char fcn[33];
char name[33];
int size;
} localvar[50];
char cfn[33], cvar[33], aindex[33], rindex[33];
char term1[33], t1index[33], term2[33], t2index[33];
char aitype,ritype,t1itype,t2itype;
int doloops,ifstmts,gsknt;
int loadprintf,loadstrlen,loadatoi;
int pos;
char ch;
int lines;
int main(int argc, char *argv[])
{
enum tokens ctoken;
int k;
if (argc == 1)
{
printf("COM68K C Compiler, Version 2.1, 8/11/03\n");
printf("Usage: com68k sourcefile\n");
printf("Do not enter the '.c' extension.\n");
exit(-1);
}
strcpy(srcname,argv[1]);
strcat(srcname,".c");
srcfile = fopen(srcname,"r");
if (srcfile == NULL)
{
printf("Cannot open %s\n",srcname);
exit(-2);
}
strcpy(asmname,argv[1]);
strcat(asmname,".asm");
asmfile = fopen(asmname,"w");
if (asmfile == NULL)
{
printf("Cannot open %s\n",asmname);
exit(-2);
}
fprintf(asmfile,";%s created from %s\n\n",asmname,srcname);
fprintf(asmfile,"\tORG\t$8000\n\n");
PreMainStuff(); //this handles global variable and
//function declarations
ShowFunctionStats();
ctoken = GetToken();
if( !match(LPAREN) )
fatal("Missing '('");
ctoken = GetToken();
if( !match(RPAREN) )
fatal("Missing ')'");
ctoken = GetToken();
if( !match(LBRACE) )
fatal("Missing '{'");
fprintf(asmfile,"\nStartMain\n");
fprintf(asmfile,"\tMOVEA.L\t#PStack-32,A7\t;setup stack\n");
fprintf(asmfile,"\tMOVEA.L\t#PStack,A0\t;setup frame ptr\n\n");
strcpy(localfn,"main");
strcpy(cfn,"main");
strcpy(fn[functs].name,"main");
fn[functs].nparms = 0;
functs++;
ParseLocalVars(0);
ProcessFunctionBody(BACKUP,ctokengl,tokenstrgl);
fprintf(asmfile,"\nMainExit\n");
fprintf(asmfile,"\tTRAP\t#2\t;clean up display\n");
fprintf(asmfile,"\tTRAP\t#9\t;return to monitor\n");
ProcessLocalVars(functs-1);
fprintf(asmfile,";-------------------------\n\n");
PostMainStuff(); //this handles function definitions
LoadLibs();
fprintf(asmfile,"\n\tDS.L\t256\t;reserve room for stack\n");
fprintf(asmfile,"PStack\n\tDC.L\t0\n\n");
ProcessGlobals();
fprintf(asmfile,"\tEND\tStartMain\n");
fclose(srcfile);
fclose(asmfile);
printf("\n%d lines compiled.\n",lines);
printf("No errors.\n");
}
void ShowFunctionStats()
{
int k,p;
if(functs > 1)
fprintf(asmfile,"\n;Function declarations\n\n");
for(k = 1; k < functs; k++)
{
fprintf(asmfile,";%c: %s\n",fn[k].type,fn[k].name);
for(p = 0; p < fn[k].nparms; p++)
fprintf(asmfile,";\t%c: %s\n",fn[k].parms[p].type,
fn[k].parms[p].name);
fprintf(asmfile,"\n");
}
}
void ProcessGlobals()
{
int k;
if(glvars)
{
fprintf(asmfile,";global variables\n");
for(k = 0; k < glvars; k++)
{
fprintf(asmfile,"%s\n",globals[k].name);
if(globals[k].size == -1)
switch(globals[k].type)
{
case 'C': fprintf(asmfile,"\tDC.B\t0,0\t;char\n"); break;
case 'I': fprintf(asmfile,"\tDC.W\t0\t;int\n"); break;
}
else
{
switch(globals[k].type)
{
case 'C': fprintf(asmfile,"\tDS.B\t%d\t;char",
(globals[k].size & 1) ? 1+globals[k].size :
globals[k].size); break;
case 'I': fprintf(asmfile,"\tDS.W\t%d\t;int",
globals[k].size); break;
}
fprintf(asmfile," array [%d]\n",globals[k].size);
}
}
fprintf(asmfile,"\n");
}
}
void PreMainStuff()
{
enum tokens ctoken;
char ttype;
char ttoken[33];
ctoken = GetToken();
do
{
if(match(tCHAR) || match(tINT) || match(tVOID))
{
switch(ctoken)
{
case tCHAR: ttype = 'C'; break;
case tINT: ttype = 'I'; break;
case tVOID: ttype = 'V'; break;
}
ctoken = GetToken();
if(!match(ALPHA) && !match(tMAIN))
fatal("missing variable/function name");
strcpy(ttoken,tokenstr);
if((ttype == 'V') && (0 == strcmp(tokenstr,"main")))
return;
ctoken = GetToken();
if(!match(SEMI) && !match(LBRACKET) && !match(LPAREN))
fatal("parse error");
if(match(LBRACKET))
{
globals[glvars].type = ttype;
strcpy(globals[glvars].name,ttoken);
globals[glvars].size = -1;
ctoken = GetToken();
if(!match(NUMBER))
fatal("missing array range");
globals[glvars].size = atoi(tokenstr);
ctoken = GetToken();
if(!match(RBRACKET))
fatal("missing ']'");
EatSemi();
glvars++;
}
else
if(match(LPAREN)) //must be function dec.
{
fn[functs].nparms = GetParmList(functs,ttype,ttoken);
functs++;
EatSemi();
}
else
{
globals[glvars].type = ttype;
strcpy(globals[glvars].name,ttoken);
globals[glvars].size = -1;
glvars++;
}
ctoken = GetToken();
}
else
fatal("missing type");
} while(TRUE);
}
void ParseLocalVars(int fn)
{
enum tokens ctoken;
char ttype;
char ttoken[33];
int lvk = 1;
ctoken = GetToken();
do
{
if(match(tCHAR) || match(tINT))
{
switch(ctoken)
{
case tCHAR: ttype = 'C'; break;
case tINT: ttype = 'I'; break;
}
ctoken = GetToken();
if(!match(ALPHA))
fatal("missing variable name");
strcpy(ttoken,tokenstr);
ctoken = GetToken();
if(!match(SEMI) && !match(LBRACKET) && !match(LPAREN))
fatal("parse error");
if(match(LBRACKET))
{
localvar[nlocals].type = ttype;
strcpy(localvar[nlocals].name,ttoken);
strcpy(localvar[nlocals].fcn,localfn);
ctoken = GetToken();
if(!match(NUMBER))
fatal("missing array range");
localvar[nlocals].size = atoi(tokenstr);
ctoken = GetToken();
if(!match(RBRACKET))
fatal("missing ']'");
EatSemi();
nlocals++;
}
else
{
localvar[nlocals].type = ttype;
strcpy(localvar[nlocals].name,ttoken);
strcpy(localvar[nlocals].fcn,localfn);
localvar[nlocals].size = -1;
localvar[nlocals].mode = -2*lvk;
lvk++;
nlocals++;
}
ctoken = GetToken();
}
} while(match(tCHAR) || match(tINT));
ctokengl = ctoken;
strcpy(tokenstrgl,tokenstr);
}
int GetParmList(int fnum, char p1type, char p1name[])
{
enum tokens ctoken;
int pknt = 0;
fn[fnum].type = p1type;
strcpy(fn[fnum].name,p1name);
fn[fnum].defined = FALSE;
ctoken = GetToken();
if(match(RPAREN))
return(0);
if(match(tVOID))
{
ctoken = GetToken();
if(!match(RPAREN))
fatal("Missing ')'");
return(0);
}
do
{
switch(ctoken)
{
case tCHAR: fn[fnum].parms[pknt].type = 'C'; break;
case tINT: fn[fnum].parms[pknt].type = 'I'; break;
default: fatal("Illegal type");
}
ctoken = GetToken();
if(!match(ALPHA))
fatal("Missing variable");
strcpy(fn[fnum].parms[pknt].name,tokenstr);
pknt++;
ctoken = GetToken();
if(match(RPAREN))
return(pknt);
if(!match(COMMA))
fatal("Missing comma");
ctoken = GetToken();
} while(pknt != 4);
fatal("Too many parameters");
}
int CheckParmList(int fnum)
{
enum tokens ctoken;
char ttoken;
int k;
ctoken = GetToken();
if(match(RPAREN))
return(0);
for(k = 0; k < fn[fnum].nparms; k++)
{
switch(ctoken)
{
case tCHAR: ttoken = 'C'; break;
case tINT: ttoken = 'I'; break;
case tVOID: ttoken = 'V'; break;
}
if(fn[fnum].parms[k].type != ttoken)
fatal("wrong type");
ctoken = GetToken();
if(0 != strcmp(fn[fnum].parms[k].name,tokenstr))
fatal("variable does not match");
if(k < (fn[fnum].nparms - 1))
{
ctoken = GetToken();
if(!match(COMMA))
fatal("Missing comma");
}
ctoken = GetToken();
}
if(!match(RPAREN))
fatal("missing ')'");
return(fn[fnum].nparms);
}
void PostMainStuff()
{
enum tokens ctoken;
char ttype;
char ttoken[33];
int k,j,found;
if(functs == 1)
return;
ctoken = GetToken();
k = 0;
do
{
if(match(tCHAR) || match(tINT) || match(tVOID))
{
switch(ctoken)
{
case tCHAR: ttype = 'C'; break;
case tINT: ttype = 'I'; break;
case tVOID: ttype = 'V'; break;
}
ctoken = GetToken();
j = 0;
found = FALSE;
do
{
if((ttype == fn[j].type)
&& (0 == strcmp(tokenstr,fn[j].name)))
found = TRUE;
else
j++;
} while((j < functs) && !found);
if(!found)
fatal("undeclared function");
fn[j].defined = TRUE;
fprintf(asmfile,"%s\n",fn[j].name);
fprintf(asmfile,"\tLINK\tA0,#-32\n");
// 4 + 2 * fn[j].nparms);
strcpy(localfn,fn[j].name);
strcpy(cfn,tokenstr);
ctoken = GetToken();
if(!match(LPAREN))
fatal("missing '('");
if(fn[j].nparms != CheckParmList(j))
fatal("parameter error");
ctoken = GetToken();
if(!match(LBRACE))
fatal("missing '{'");
// parse local vars
ParseLocalVars(j);
ProcessFunctionBody(BACKUP,ctokengl,tokenstrgl);
fprintf(asmfile,"\tUNLK\tA0\n");
fprintf(asmfile,"\tRTS\n");
ProcessLocalVars(j);
fprintf(asmfile,";-------------------------\n\n");
ctoken = GetToken();
}
else
fatal("missing type");
k++;
} while(k < (functs-1));
}
enum tokens GetToken()
{
char singles[] = "&;{},=:()[]?'\"\\+-*/><";
char doubles[] = "*= /= %= += -= || && == != <= >= << >> ++ -- //";
char ds[3];
int tsptr = 0;
int p,k,found,i;
if (lines == 0)
{
do
{
fgets(input,131,srcfile);
if(feof(srcfile))
return(EOIF);
if( (1 == strlen(input)) && (0x0a == input[0]) )
{
//do not process a blank line
}
else
{
printf("\nLine %d: %s",lines++,input);
p = 0;
do
{
ch = input[p];
p++;
} while((ch == ' ') || (ch == '\t')); /* Skip blanks */
fprintf(asmfile,";\t%s",&input[p-1]);
pos = 0;
}
} while (0 == lines);
}
if((pos >= strlen(input)) || (0x0a == input[pos]))
{
//get a new line
do
{
fgets(input,131,srcfile);
if(feof(srcfile))
return(EOIF);
if( (1 == strlen(input)) && (0x0a == input[0]) )
{
//do not process a blank line
}
else
{
printf("\nLine %d: %s",lines++,input);
p = 0;
do
{
ch = input[p];
p++;
} while((ch == ' ') || (ch == '\t')); /* Skip blanks */
fprintf(asmfile,";\t%s",&input[p-1]);
pos = 0;
}
} while (0 != pos);
}
do
{
ch = input[pos];
pos++;
} while(ch == ' '); /* Skip blanks */
/* Do we have a symbol name? */
if(isalpha(ch) != 0)
{
printf("%c",ch); /* Print first letter */
tokenstr[tsptr++] = ch;
/* Print remaining letters/digits */
while(isalnum(ch = input[pos]))
{
printf("%c",input[pos]);
tokenstr[tsptr++] = ch;
pos++;
}
tokenstr[tsptr] = '\0';
printf("<%s>",tokenstr);
found = FALSE;
k = 0;
do
{
if (0 == strcmp(tokenstr,rwords[k]))
found = TRUE;
else
k++;
} while ((k < NUMRESWRD) && !found);
if(found)
return(tVOID + k);
else
return(ALPHA);
}
/* Do we have a number? */
if(isdigit(ch))
{
printf("%c",ch); /* Print first digit */
tokenstr[tsptr++] = ch;
/* Print remaining digits */
while(isdigit(ch = input[pos]))
{
printf("%c",input[pos]);
tokenstr[tsptr++] = ch;
pos++;
}
tokenstr[tsptr] = '\0';
return(NUMBER);
}
/* Check for double token */
ds[0] = ch; /* Load double token */
ds[1] = input[pos];
if(ds[1] == ' ')
ds[1] = 0x07;
ds[2] = '\0';
if(strstr(doubles,ds) != '\0')
{
printf("<<%s>>",ds); /* Print it */
strcpy(tokenstr,ds);
pos++;
for(i = 0; i < 46; i+=3)
{
if((ds[0] == doubles[i]) &&
(ds[1] == doubles[i+1]))
p = i;
}
switch(p)
{
case 0: return(TIMESEQ);
case 3: return(DIVEQ);
case 6: return(MODEQ);
case 9: return(PLUSEQ);
case 12: return(MINUSEQ);
case 15: return(LOGICOR);
case 18: return(LOGICAND);
case 21: return(EQUAL);
case 24: return(NOTEQUAL);
case 27: return(LESSEQ);
case 30: return(GREQ);
case 33: return(SHIFTL);
case 36: return(SHIFTR);
case 39: return(PLUSPLUS);
case 42: return(MINUSMINUS);
case 45:
do
{
ch = input[pos];
pos++;
} while (ch != 0x0a);
return( GetToken() );
}
}
/* Check for a single token */
if(strchr(singles,ch) != '\0')
{
printf("%c",ch); /* Print token */
tokenstr[tsptr++] = ch;
/* String or character token? */
if((ch == '\"') || (ch == '\''))
{
do /* Print remaining token text */
{
ch = input[pos];
printf("%c",ch);
tokenstr[tsptr++] = ch;
pos++;
} while((ch != '\"') && (ch != '\''));
tokenstr[tsptr] = '\0';
if( tokenstr[0] == '\"')
return(STRING);
else
return(CHAR);
}
/* Check for == token */
if((ch == '=') && (input[pos] == '='))
{
printf("=");
pos++;
return(EQUAL);
}
//select single token value
switch(ch)
{
case '!': return(LNOT);
case '&': return(ADDR);
case ';': return(SEMI);
case '{': return(LBRACE);
case '}': return(RBRACE);
case ',': return(COMMA);
case '=': return(ASSIGN);
case ':': return(COLON);
case '(': return(LPAREN);
case ')': return(RPAREN);
case '[': return(LBRACKET);
case ']': return(RBRACKET);
case '?': return(QMARK);
case '\'': return(SQUOTE);
case '\"': return(DQUOTE);
case '\\': return(FSLASH);
case '+': return(PLUSOP);
case '-': return(MINUSOP);
case '*': return(TIMESOP);
case '/': return(DIVOP);
case '>': return(GTHAN);
case '<': return(LTHAN);
}
}
else
{
printf("%c",ch);
tokenstr[tsptr++] = ch;
tokenstr[tsptr] = '\0';
return(OTHER);
}
}
void fatal(char *msg)
{
printf("%s\n",msg);
fclose(srcfile);
fclose(asmfile);
exit(-1);
}
void EatSemi()
{
enum tokens ctoken;
ctoken = GetToken();
if(!match(SEMI))
fatal("missing ';'");
}
int isFunction(char fcn[])
{
int k,found;
k = 0;
found = FALSE;
do
{
if(0 == strcmp(fcn,fn[k].name))
{
found = TRUE;
currfn = k;
}
else
k++;
} while ((k < functs) && !found);
return(found);
}
int isGlobal(char tok[])
{
int k,found;
k = 0;
found = FALSE;
do
{
if(0 == strcmp(tok,globals[k].name))
{
found = TRUE;
currglobal = k;
}
else
k++;
} while ((k < glvars) && !found);
return(found);
}
int isLocal(char fcn[], char tok[])
{
int k,found;
k = 0;
found = FALSE;
do
{
if((0 == strcmp(tok,localvar[k].name)) &&
(0 == strcmp(fcn,localvar[k].fcn)))
{
found = TRUE;
currlocal = k;
}
else
k++;
} while ((k < nlocals) && !found);
return(found);
}
int isArray(char fcn[], char var[])
{
int found = FALSE;
if(isLocal(fcn,var))
{
if(localvar[currlocal].size != -1)
{
found = TRUE;
}
}
else
if(isGlobal(var))
{
if(globals[currglobal].size != -1)
{
found = TRUE;
}
}
return(found);
}
int isFparm(char fcn[], char par[])
{
int j,k,found;
k = 0;
found = FALSE;
do
{
if(0 == strcmp(fcn,fn[k].name))
{
j = 0;
do
{
if(0 == strcmp(par,fn[k].parms[j].name))
{
currparm = j;
currfn = k;
found = TRUE;
}
else
j++;
} while ((j < fn[k].nparms) && !found);
}
else
k++;
} while ((k < (functs-1)) && !found);
return(found);
}
void ProcessLocalVars(int fnum)
{
int k,first = TRUE;
if(!nlocals)
return;
for(k = 0; k < nlocals; k++)
{
if(0 == strcmp(localfn,localvar[k].fcn))
{
if(first)
{
fprintf(asmfile,"\n;Local variables for %s()\n\n",localfn);
first = FALSE;
}
if(localvar[k].size == -1)
fprintf(asmfile,";%s\n;\t<stack var>, %d(A0)\n\n",
localvar[k].name,localvar[k].mode);
else
{
fprintf(asmfile,"F%d%s\n\tDS.",fnum,localvar[k].name);
if(localvar[k].type == 'C')
fprintf(asmfile,"B\t");
else
fprintf(asmfile,"W\t");
if(localvar[k].type == 'C')
{
fprintf(asmfile,"%d\t; char array [%d]\n",
localvar[k].size,localvar[k].size);
if(localvar[k].size & 1)
fprintf(asmfile,"\tDS.B\t1\n");
fprintf(asmfile,"\n");
}
else
fprintf(asmfile,"%d\t; int array [%d]\n\n",
localvar[k].size,localvar[k].size);
}
}
}
fprintf(asmfile,"\n");
}
void ProcessFunctionBody(int tmode,enum tokens tok, char ts[])
{
enum tokens ctoken;
enum tokens ctoken2;
enum tokens tstack[5];
char type;
int val;
int dlknt,ifknt;
char rvar[33],fcall[33],rvtype;
int tsptr,k;
char tstr[5][33];
int vps;
int spalpha;
if(tmode != BACKUP)
ctoken = GetToken();
else
{
ctoken = ctokengl;
strcpy(tokenstr,tokenstrgl);
}
do
{
spalpha = FALSE;
if(match(tIF))
{
ifknt = ifstmts;
ifstmts++;
ctoken = GetToken();
if(!match(LPAREN))
fatal("missing '('");
ctoken = GetToken();
if(match(ALPHA))
{
ReadVar(cfn,tokenstr);
ctoken = GetToken();
ctoken2 = ctoken;
ctoken = GetToken();
if(match(CHAR) || match(NUMBER) || match(ALPHA)) // if(var <op> number)
{
if(match(CHAR))
fprintf(asmfile,"\tCMPI.B\t#%s,D7\n",tokenstr);
else
if(match(NUMBER))
fprintf(asmfile,"\tCMPI.W\t#%s,D7\n",tokenstr);
else
{
fprintf(asmfile,"\tMOVE.W\tD7,-(A7)\n");
ReadVar(cfn,tokenstr);
fprintf(asmfile,"\tMOVE.W\tD7,D4\n");
fprintf(asmfile,"\tMOVE.W\t(A7)+,D7\n");
fprintf(asmfile,"\tCMP.W\tD4,D7\n",tokenstr);
}
ctoken = ctoken2;
if(match(EQUAL))
{
fprintf(asmfile,"\tBNE\tEndIF%d\n\n",ifknt);
}
else
if(match(NOTEQUAL))
{
fprintf(asmfile,"\tBEQ\tEndIF%d\n\n",ifknt);
}
else
if(match(LTHAN))
{
fprintf(asmfile,"\tBGT\tEndIF%d\n\n",ifknt);
}
else
if(match(GTHAN))
{
fprintf(asmfile,"\tBLT\tEndIF%d\n\n",ifknt);
}
if(match(LOGICAND))
{
fprintf(asmfile,"\tBEQ\tEndIF%d\n\n",ifknt);
}
if(match(LOGICOR))
{
fprintf(asmfile,"\tBEQ\tEndIF%d\n\n",ifknt);