preproc.c

花了很长时间找了这么多c语言的编译器

/*                               `
 * 68K/386 32-bit C compiler.
 *
 * copyright (c) 1997, David Lindauer
 * 
 * This compiler is intended for educational use.  It may not be used
 * for profit without the express written consent of the author.
 *
 * It may be freely redistributed, as long as this notice remains intact
 * and either the original sources or derived sources 
 * are distributed along with any executables derived from the originals.
 *
 * The author is not responsible for any damages that may arise from use
 * of this software, either idirect or consequential.
 *
 * v1.35 March 1997
 * David Lindauer, [e-mail]
 *
 * Credits to Mathew Brandt for original K&R C compiler
 *
 */
#include        <stdio.h>
#include 				<ctype.h>
#include				"utype.h"
#include				"cmdline.h"
#include        "expr.h"
#include        "c.h"
#include        "errors.h"
#include				"time.h"

extern short inputline[];
extern FILE *inputFile;
extern TABLE gsyms,defsyms;
extern long ival;
extern char laststr[];
extern HASHREC **defhash;
extern char *infile;
extern int incconst;
extern char *prm_searchpath;
extern int prm_cplusplus, prm_ansi;
extern short *lptr;
extern int cantnewline;
extern char *infile;
extern int backupchar;
extern int floatregs,dataregs,addrregs,basefr,basedr,basear;
extern int prm_cmangle;
extern enum e_sym lastst;
extern char lastid[];
extern int lastch;
extern int lineno;
extern int global_flag;
typedef struct _list {
		struct _list *link;
		char *data;
} LIST;
typedef struct _startups_ {
		struct _startups_ *link;
		char *name;
		int prio;
} STARTUPS;
char *errfile;
int errlineno = 0;
IFSTRUCT			  *ifshold[10];
char 						*inclfname[10];
FILE            *inclfile[10];
int             incldepth = 0;
int             inclline[10];
short            *lptr;
LIST *incfiles = 0,*lastinc;

IFSTRUCT *ifs = 0;
int ifskip = 0;
int elsetaken = 0;

void filemac(short *string);
void datemac(short *string);
void timemac(short *string);
void linemac(short *string);

static char *unmangid;		/* In this module we have to ignore leading underscores */
static STARTUPS *startuplist, *rundownlist;
static short defkw[] = { 'd','e','f','i','n','e','d', 0 };

/* List of standard macros */
#define INGROWNMACROS 4

struct inmac {
		char *s;
		void (*func)();
} ingrownmacros[INGROWNMACROS] = { 
			{ "__FILE__",filemac }, { "__DATE__",datemac, },
			{ "__TIME__", timemac }, { "__LINE__",linemac } };

void pushif(void);

/* Moudle init */
void preprocini()
{
	floatregs = basefr;
	dataregs = basedr;
	addrregs = basear;
	incldepth = 0;
	incfiles = 0;
	ifs = 0;
	ifskip = elsetaken = 0;
	unmangid = lastid;
	if (prm_cmangle)
		unmangid++;
	startuplist = rundownlist = 0;
}
/* Preprocessor dispatch */
int preprocess(void)
{
        ++lptr;
        lastch = ' ';
        getsym();               /* get first word on line */

        if( lastst != id  && lastst != kw_else && lastst!= kw_if) {
                generror(ERR_IDEXPECT,0,0);
                return incldepth == 0;
                }
        if( strcmp(unmangid,"include") == 0 )
                return doinclude();
        else if( strcmp(unmangid,"define") == 0 )
                return dodefine();
				else if (strcmp(unmangid,"endif") == 0)
								return doendif();
				else if (lastst == kw_else)
								return doelse();
				else if (strcmp(unmangid,"ifdef") == 0)
								return doifdef(TRUE);
				else if (strcmp(unmangid,"ifndef") == 0)
								return doifdef(FALSE);
				else if (lastst == kw_if) {
								repdefines(lptr);
								defcheck(lptr);
								return doif(0);
				}
        else if( strcmp(unmangid,"elif") == 0 ) {
								repdefines(lptr);
								defcheck(lptr);
                return doelif();
				}
				else if (strcmp(unmangid,"undef") == 0)
								return(doundef());
				else if (strcmp(unmangid,"error") == 0)
								return(doerror());
				else if (strcmp(unmangid,"pragma") == 0)
								return(dopragma());
				else if (strcmp(unmangid,"line") == 0)
								return(doline());
        else    {
                gensymerror(ERR_PREPROCID,unmangid);
                return incldepth == 0;
                }
}

int doerror(void)
{
	char *temp;
	int i=0;
	if (ifskip)
		return incldepth == 0;
	global_flag++;
	temp = xalloc(pstrlen(lptr)*3+2);
	pstrcpy(temp,lptr);
	while (*lptr)
		i+=installphichar(*lptr++,temp,i);
	temp[i-1] = 0;
	global_flag--;
	basicerror(ERR_ERROR,temp);
	return incldepth == 0;
}
int dopragma(void)
{
	char buf[40],*p=buf;
  STARTUPS *a;
	int val = 0,sflag;
	if (ifskip)
		return incldepth == 0;
	lineToCpp();
	getsym();
	if (lastst != id)
		return incldepth == 0;
	if (!strcmp(unmangid,"startup"))
		sflag = 1;
	else if (!strcmp(unmangid,"rundown"))
		sflag = 0;
	else if (!strncmp(unmangid,"regopt",6)) {
		short *s = lptr;
		dataregs = floatregs = addrregs = 0;
		while (*s != '\n') {
			switch (*s) {
				case 'a':
				case 'A':
					addrregs = 1;
					break;
				case 'f':
				case 'F':
					floatregs = 1;
					break;
				case 'd':
				case 'D':
					dataregs = 1;
					break;
			}
			s++;
		}
		return incldepth == 0;
	}
	else return incldepth == 0;

	if (prm_cmangle)	
		*p++ = '_';
	while (isalnum(*lptr) || *lptr == '_')
		*p++=*lptr++;
	*p=0;
	while (*lptr && (*lptr == ' ' || *lptr == '\t' || *lptr == ','))
		lptr++;
	if (*lptr  && *lptr != '\n' && !isdigit(*lptr)) {
		generror(ERR_ILLCHAR,*lptr,0);
		while (*lptr)
			lptr++;
	}

	if (isdigit(*lptr))
		while (isdigit(*lptr)) {
			val *= 10;
			val += (*lptr++)-'0';
		}
	else
		val = 64;
	++global_flag;
	a = xalloc(sizeof(STARTUPS));
	a->name = litlate(buf);
	a->prio = val;
  if (sflag) {
		a->link = startuplist;
		startuplist = a;
	}
	else {
		a->link = rundownlist;
		rundownlist = a;
	}
	--global_flag;
	while (*lptr && (*lptr == ' ' || *lptr == '\t'))
		lptr++;
	if (*lptr  && *lptr != '\n')
		generror(ERR_ILLCHAR,*lptr,0);
	return incldepth == 0;
}
void dumpstartups(void)
/*
 * Dump references to startup/rundown code
 */
{
	SYM *s;
	if (startuplist) {
		startupseg();
		while (startuplist) {
			s = search(startuplist->name,&gsyms);
			if (!s || s->tp->type != bt_ifunc)
				gensymerror(ERR_UPDOWN,startuplist->name);
			else  {
				gensrref(s,startuplist->prio);
				s->tp->uflags |= UF_USED;
			}
			startuplist = startuplist->link;
		}
	}
	if (rundownlist) {
		rundownseg();
		while (rundownlist) {
			s = search(rundownlist->name,&gsyms);
			if (!s || s->tp->type != bt_ifunc)
				gensymerror(ERR_UPDOWN,rundownlist->name);
			else {
				gensrref(s,rundownlist->prio);
				s->tp->uflags |= UF_USED;
			}
			rundownlist = rundownlist->link;
		}
	}
}
int doline(void)
/*
 * Handle #line directive
 */
{
	int n;
	getsym();
	if (lastst != iconst) 
		gensymerror(ERR_PREPROCID,"#line");
	else {
		n = ival;
		getsym();
		if (lastst != sconst) 
			gensymerror(ERR_PREPROCID,"#line");
		else 
			if (!ifskip) {
				errfile = litlate(laststr);
				errlineno = n-1;
			}
	}
	return incldepth == 0;
}
int doinclude(void)
/*
 * HAndle include files
 */
{       int     rv;
				FILE *oldfile = inputFile;
				incconst = TRUE;
        getsym();               /* get file to include */
				incconst = FALSE;
				if (ifskip)
					return incldepth == 0;
        if( lastst != sconst ) {
                gensymerror(ERR_INCLFILE,"include");
                return incldepth == 0;
                }
				if (incldepth > 9) {
					generror(ERR_PREPROCID, 0,0);
					return incldepth == 0;
				}
        inputFile = SearchPath(laststr,prm_searchpath,"r");
        if( inputFile == 0 ) {
                gensymerror(ERR_CANTOPEN,laststr);
                inputFile = oldfile;
                rv = incldepth == 0;
                }
        else    {
								LIST *list;
								pushif();
								ifshold[incldepth] = ifs;
								elsetaken = 0;
								ifskip = 0;
								ifs = 0;
				        inclline[incldepth] = lineno;
        				inclfile[incldepth] = oldfile;  /* push current input file */
								inclfname[incldepth++] = infile;
								global_flag++;
								infile = litlate(laststr);
								list = xalloc(sizeof(LIST));
								list->data = infile;
								list->link = 0;
								if (incfiles)
									lastinc = lastinc->link = list;
								else
									incfiles = lastinc = list;
								errfile = infile;
								errlineno = 0;
								global_flag--;
                rv = incldepth == 1;
                lineno = 0;
                }
        return rv;
}

short *plitlate(short *string)
{
	short *temp = xalloc(pstrlen(string)*sizeof(short)+sizeof(short));
	pstrcpy(temp,string);
	return temp;
}
void glbdefine(char *name, char*value)
{
{       SYM     *sp;
				short *p;
				DEFSTRUCT *def;
				if (( sp = search(name,&defsyms) )!= 0)
					return;
        ++global_flag;          /* always do #define as globals */
        sp = xalloc(sizeof(SYM));
        sp->name = litlate(name);
				def = xalloc(sizeof(DEFSTRUCT));
				def->args = 0;
				def->argcount = 0;
				def->string = p = xalloc(strlen(value)*sizeof(short));
				while (*value)
					*p++=*value++;
				*p++=0;
        sp->value.s = (char *) def;
        insert(sp,&defsyms);
        --global_flag;
        return;
}
}
/* Handle #defines
 * Doesn't check for redefine with different value
 * Does handle ANSI macros
 */
int dodefine(void)
{       SYM     *sp;
				DEFSTRUCT *def;
				short *args[40],count=0;
				short *olptr;
				int p;
        getsym();               /* get past #define */
				if (ifskip)
					return incldepth == 0;
				olptr = lptr;
        if( lastst != id ) {
                generror(ERR_IDEXPECT,0,0);
                return incldepth == 0;
                }
				if (( sp = search(unmangid,&defsyms) )!= 0)
					undef2();
        ++global_flag;          /* always do #define as globals */
        sp = xalloc(sizeof(SYM));
        sp->name = litlate(unmangid);
				def = xalloc(sizeof(DEFSTRUCT));
				def->args = 0;
				def->argcount = 0;
				if (lastch == '(') {
					getdefsym();
					getdefsym();
					while (lastst == id) {
						args[count++] = plitlate(unmangid);
						getdefsym();
						if (lastst != comma)
							break;
						getdefsym();
					}
					if (lastst != closepa)
					  generror(ERR_PUNCT,closepa,0);
					olptr = lptr;
					def->args = xalloc(count*sizeof(short *));
					memcpy(def->args,args,count*sizeof(short *));
					def->argcount = count+1;
				}
				while (iswhitespacechar(*olptr))
					olptr++;
				p = pstrlen(olptr);
				if (olptr[p-1] == 0x0a)
					olptr[p-1] = 0;
				def->string = plitlate(olptr);
        sp->value.s = (char *) def;
        insert(sp,&defsyms);