main.cpp

虚拟机设计与实现——C/C++

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                                                                   +
+ main.cpp - this is the boot-strap file				    		+
+                                                                   +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ ANSI includes                                                     + 
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ virtual machine includes                                          + 
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#ifdef WINDOWS_32
#include<win32.c>
#endif
#ifdef LINUX_x86
#include<linux.c>
#endif

#include<iset.c>	
#include<exenv.c>		

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
+ prototypes                                                        +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

/*void main(int argc, char *argv[]);*/
void shutDown(U1 code);

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ assembler components                                              +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#include<common.c>
#include<error.c>
#include<cmdline.cpp>
#include<lnscan.cpp>
#include<strtbl.cpp>
#include<globvar.cpp>
#include<sframe.cpp>
#include<label.cpp>
#include<proc.cpp>
#include<symtbl.cpp>
#include<hashtbl.cpp>
#include<linetok.cpp>
#include<pass1.cpp>
#include<pass2.cpp>
#include<bldfile.cpp>

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
+ macros                                                            +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

/*#define MAIN_DEBUG		1*/

#ifdef	MAIN_DEBUG
#define	MAIN_DEBUG0(arg);				printf("main(): ");printf(arg);
#define MAIN_DEBUG1(arg1,arg2);			printf("main(): ");printf(arg1,arg2);
#define MAIN_DEBUG2(arg1,arg2,arg3);	printf("main(): ");printf(arg1,arg2,arg3);
#else
#define	MAIN_DEBUG0(arg);
#define MAIN_DEBUG1(arg1,arg2);
#define MAIN_DEBUG2(arg1,arg2,arg3);
#endif

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
+ function definitions                                              +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

void main(int argc, char *argv[])
{
	CommandLine cmdLine(&maxErrors);
	nErrors = 0;

	/*1) handle command line arguments */

	MAIN_DEBUG0("handling arguments\n");

	if((cmdLine.handleArgs(argc,argv))==FALSE)
	{ 
		FATAL_ERROR(); 
	}

	/*2) PASS1 -  scan, parse, populate symbol table*/

	MAIN_DEBUG0("initiating first pass\n");

	StringTable strTbl;
	HashTable hashTbl(&strTbl);
	SymbolTable symTbl(&strTbl);

	struct Line line;
	{
		Pass1 pass1(&strTbl,&symTbl,&hashTbl);
		LineScanner scanner(&cmdLine);
		line = scanner.getInputLine();
		while(line.end!=TRUE)
		{
			pass1.parseLine(&line);
			line = scanner.getInputLine();
		}
		pass1.parseLine(&line);
	}

	/*
	strTbl.printStrTbl();
	symTbl.printSymTbl();
	hashTbl.printHashTbl();
	*/

	/*if errors exist, shutdown before generate anything*/

	if(nErrors > 0)
	{
		printf("%d Error(s) during first pass\n",nErrors);
		printf("build failed\n");
		FATAL_ERROR();
	}

	/*3) PASS2 - create bytecode temp file and listing file */

	MAIN_DEBUG0("initiating second pass\n");
	{
		Pass2 pass2(&cmdLine,&strTbl,&symTbl,&hashTbl);
		LineScanner scanner(&cmdLine);
		line = scanner.getInputLine();
		while(line.end!=TRUE)
		{
			pass2.parseLine(&line);
			line = scanner.getInputLine();
		}
		pass2.parseLine(&line);
		if(cmdLine.listing==TRUE){ pass2.generateSymbolSummary(); }
	}
	MAIN_DEBUG1("%lu bytes written to tempfile\n",pass2.bytePosPass2);
	

	/*if errors exist after 2rd pass, shutdown */

	if(nErrors > 0)
	{
		printf("main(): %d Error(s) during second pass\n",nErrors);
		printf("main(): build failed\n");
		FATAL_ERROR();
	}

	/*4) build compilation unit */

	MAIN_DEBUG0("building bytecode executable\n");
	{
		BuildFile bldfile(&cmdLine,&strTbl, &symTbl);
		bldfile.buildFileFormat();
	}

	/*5) safe-shutdown */
	
	printf("main(): exiting with (%d) errors\n",nErrors);
	shutDown(SHUTDOWN_OK);
	return;

}/*end main*/

/* ----------------------------------------------------------------*/

void shutDown(U1 code)
{
	exit(code);

}/*end shutDown*/