main.c

/****************************************************/
/* File: main.c                                     */
/* Main program for TINY compiler                   */
/* Compiler Construction: Principles and Practice   */
/* Kenneth C. Louden                                */
/****************************************************/

#include "globals.h"

/* set NO_PARSE to TRUE to get a scanner-only compiler */
#define NO_PARSE FALSE
/* set NO_ANALYZE to TRUE to get a parser-only compiler */
#define NO_ANALYZE FALSE

/* set NO_CODE to TRUE to get a compiler that does not
 * generate code
 */
#define NO_CODE FALSE

#include "util.h"
#if NO_PARSE
#include "scan.h"
#else
#include "parse.h"
#if !NO_ANALYZE
#include "analyze.h"
#if !NO_CODE
#include "cgen.h"
#endif
#endif
#endif

/* allocate global variables */
int lineno = 0;
FILE * source;
FILE * listing;
FILE * code;

/* allocate and set tracing flags */
int EchoSource = TRUE;
int TraceScan = TRUE;
int TraceParse = TRUE;
int TraceAnalyze = TRUE;
int TraceCode = TRUE;

int Error = FALSE;

int main( int argc, char * argv[] ) {

    TreeNode * syntaxTree;
    char pgm[120]; /* source code file name */
    if (argc != 2)
        { fprintf(stderr,"usage: %s <filename>\n",argv[0]);
            exit(1);
        }
    strcpy(pgm,argv[1]) ;
    if (strchr (pgm, '.') == NULL)
        strcat(pgm,".tny");
    source = fopen(pgm,"r");
    if (source==NULL)
        { fprintf(stderr,"File %s not found\n",pgm);
            exit(1);
        }


    listing = stdout; /* send listing to screen */
    fprintf(listing,"\nTINY COMPILATION: %s\n",pgm);
#if NO_PARSE
    while (getToken()!=ENDFILE);
#else
    syntaxTree = parse();
    if (TraceParse) {
        fprintf(listing,"\nSyntax tree:\n");
        printTree(syntaxTree);
    }
#if !NO_ANALYZE
    if (! Error)
        { if (TraceAnalyze) fprintf(listing,"\nBuilding Symbol Table...\n");
            buildSymtab(syntaxTree);
            if (TraceAnalyze) fprintf(listing,"\nChecking Types...\n");
            typeCheck(syntaxTree);
            if (TraceAnalyze) fprintf(listing,"\nType Checking Finished\n");
        }
#if !NO_CODE
    if (! Error)
        { char * codefile;
            int fnlen = strcspn(pgm,".");
            codefile = (char *) calloc(fnlen+4, sizeof(char));
            strncpy(codefile,pgm,fnlen);
            strcat(codefile,".tm");
            code = fopen(codefile,"w");
            if (code == NULL)
                { printf("Unable to open %s\n",codefile);
                    exit(1);
                }
            codeGen(syntaxTree,codefile);
            fclose(code);
        }
#endif
#endif
#endif
    fclose(source);
    return 0;
}