main.cpp

CMinus 小型编译器的词法分析与语法分析部分

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

#include "globals.h"
//#define NO_PARSE FALSE
#include "util.h"
//#if NO_PARSE
#include "scan.h"
//#else
#include "parse.h"
//#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 Error = FALSE;


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,".cm");
  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,"\nCMINUS COMPILATION: %s\n",pgm);
#if NO_PARSE
  while (getToken()!=ENDFILE);
#else
  syntaxTree = parse();
  if (TraceParse) {
    fprintf(listing,"\nSyntax tree:\n");
    printTree(syntaxTree);
  }
#endif
  fclose(source);
  return 0;
}