main.cpp

完成一个简化的C语言编译程序

#include "globals.h"

#define NO_PARSE FALSE
#define NO_ANALYZE FALSE
#define NO_CODE FALSE
#include "util.h"
#if     NO_PARSE
#include "scaner.h"
#else
#include "parser.h"
#include "parse.h"
#endif
#if     !NO_ANALYZE
#include "analyze.h"
#include "symtab.h"
#endif
#if    !NO_CODE
#include "gencode.h"
#endif

 
int lineno=0;
FILE* source;
FILE* listing;
FILE* code;
tableRec* globalTable;

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;
	globalTable=new tableRec;
	globalTable->child=NULL;
	globalTable->parent=NULL;
	globalTable->sibling=NULL;
	for(int q=0;q<BUCKETSIZE;q++)
		globalTable->table[q]=NULL;

	char pgm[20];
	if(argc!=2)
	{
	  fprintf(stderr,"usage: %s<filename>\n",argv[0]);
	  return 0;
	}
    strcpy(pgm,argv[1]);
    source=fopen(pgm,"r+");
 //	listing=fopen("listing.txt","w+");
	listing=stdout;
	if(source==NULL||listing==NULL)
	     printf("can't open files!");
#if NO_PARSE
	while(getToken()!=0);
#else
    syntaxTree=parse();
	if(TraceParse)
	{
		fprintf(listing,"\nSyntax tree:\n");
	    printTree(syntaxTree);
	}
#if !NO_ANALYZE
	if(!Error)
	{
	   fprintf(listing,"\nBuilding Symbol Table ...\n");
	   buildSymtab(syntaxTree,globalTable);
	   printSymTab(listing,globalTable);
	   fprintf(listing,"\nChecking Types ...\n");
	   typeCheck(syntaxTree);
	   fprintf(listing,"\nType Checking Finished\n");
	}

#if !NO_CODE
	code=fopen("code.txt","w+");
	if(code==NULL)
	{
	     printf("Unable to open file!");
		 return 0;
	}
	genCode(syntaxTree);
#endif
#endif
#endif

  return 0;    
}