error.c

编译原理这门课确实不是很容易

/*
 * 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
 *
 */
/* 
 * error handler
 */
#include        <stdio.h>
#include 				<string.h>
#include        "expr.h"
#include        "c.h"
#include        "errors.h"
#include 				"diag.h"

extern int prm_errfile;
extern FILE *errFile;
extern int global_flag;
extern FILE *listFile;
extern int errlineno;
extern char *errfile;
extern int prm_asmfile;
extern FILE *outputFile;
extern int prm_maxerr;
extern int prm_diag;
extern int prm_listfile;
extern int lastch;
extern enum e_sym lastst;
extern char lastid[];
extern int lineno;
extern FILE            *inclfile[10];  /* shared with preproc */
extern int             incldepth;      /* shared with preproc */
extern char *infile;
extern SYM *currentfunc;
extern int prm_warning,prm_cplusplus;

int diagcount = 0;
ERRORS *errlist = 0;
static ERRORS *errtail = 0;
static ERRORS *curerr = 0; 
static char expectlist[] = { "########################=##############,:;#[]{}()" };
static int errline;

/* table of which warnings are enabled */
char nowarn[ERR_MAX];
/* table of warning keywords for the -w command line option
 */
char warnarray[ERR_MAX][4] = { 
	"all","","","","","","","",
	"","","","","","","","",
	"","","","","","","","",
	"","","","","","","","",
	"","","","","cln","","","",
	"","","","","","","","",
	"","","","","","ret","sun","sud",
	"sas","npo","urc","fun","cno","ieq","","nco",
	"lad","","","zer","dpc","nsf","lun","pro",
	"cnv","","irg","san","ssu","","","",
	"","","tua","","tui","","","",
	"","","","","","","","",
	"","","","","","suz","fsu","lli",
  "","","","","","spc","","",
	"","","","","","","","",
  "","","","","",""
};
int             total_errors = 0;
void initerr(void)
{
                                errlist = errtail = curerr = 0;
        total_errors = 0;
                                diagcount  = 0;                 
	errline = 0;
}
/*
 * handling for warnings on the command line
 */
void warning_setup(char select, char *string)
{
	int bool = FALSE;
	while (*string) {
		int i;
		if (string[0] == '-') {
			bool = TRUE;
			string++;
		}
		else
			if (string[0] == '+')
				string++;
		for (i=0; i < ERR_MAX; i++)
			if (!strncmp(warnarray[i],string,3)) {
				if (i== 0) {
					int j;
					for (j =0; j < ERR_MAX; j++)
						nowarn[j] = (unsigned char)bool;
				}
				else
					nowarn[i] = (unsigned char)bool;
				string += 3;
				break;
			}
		if (i==ERR_MAX) {
			fatal("Invalid warning");
		}
	}
}
#ifdef DIAGNOSTICS
void diag(char *s)
/*
 * internal diags come here
 */
{ 
        diagcount++;
  if (prm_diag) {
                printf("DIAG - %s\n",s);
                if (prm_errfile && errFile)
                        fprintf(errFile,"/*DIAG - %s*/",s);
                if (prm_listfile && listFile)
                        fprintf(listFile,"/*DIAG - %s*/",s);
                if (prm_asmfile)
                        fprintf(outputFile,"DIAG - %s\n",s);
        }
}
#endif
int printerr(char *buf, ERRORS *err)
/*
 * subroutine gets the error code and returns whether it is an error or
 * warning
 */
{
        int errlvl = 0;
        switch (err->errornumber) {
								case ERR_NOCASE:
                        sprintf(buf,"Expected 'case' or 'default'");
                        break;
                case ERR_PUNCT:
                        sprintf(buf,"Expected '%c'",expectlist[(int)err->data]);
                        break;
                case ERR_INSERT:
                        sprintf(buf,"Inserted '%c'",expectlist[(int)err->data]);
                        break;
                case ERR_NEEDCHAR:
                        sprintf(buf,"Expected '%c'",(char)err->data);
                        break;
                case ERR_ILLCHAR:
                        sprintf(buf,"Illegal character '%c'",(char)err->data);
                        break;
                case ERR_NEEDCONST:
                        sprintf(buf,"Constant value expected");
                        break;
                case ERR_UNDEFINED:
                        sprintf(buf,"Undefined symbol '%s'", (char *)err->data);
                        break;
                case ERR_DUPSYM:
                        sprintf(buf,"Duplicate symbol '%s'", (char *)err->data);
                        break;
                case ERR_IDENTEXPECT:
                        sprintf(buf,"Expected '%s'",(char *)err->data);
                        break;
                case ERR_IDEXPECT:
                        sprintf(buf,"Identifier expected");
                        break;
                case ERR_INITSIZE:
                        sprintf(buf,"Too many initializers");
                        break;
                case ERR_NOINIT:
                        sprintf(buf,"Cannot initialize '%s'",(char *)err->data);
                        break;
                case ERR_PREPROCID:
                        sprintf(buf,"Invalid preprocessor directive '%s'",(char *)err->data);
                        break;
                case ERR_INCLFILE:
                        sprintf(buf,"File name expected in #include directive");
                        break;
                case ERR_CANTOPEN:
                        sprintf(buf,"Cannot open file \"%s\" for read access",(char *)err->data);
                        break;
                case ERR_ILLCLASS:
                        sprintf(buf,"Illegal storage class specifier '%s'",(char *)err->data);
                        break;
                case ERR_ILLCLASS2:
                        sprintf(buf,"Illegal storage class specifier on '%s'",(char *)err->data);
                        break;
                case ERR_DUPCASE:
                        sprintf(buf,"Duplicate case %d",(int)err->data);
                        break;
                case ERR_RETMISMATCH:
                        sprintf(buf,"Type mismatch in return");
                        break;
                case ERR_ARGMISMATCH:
                        sprintf(buf,"Type mismatch in arg '%s'",(char *)err->data);
                        break;
                case ERR_ARGLENSHORT:
                        sprintf(buf,"Argument list too short in redeclaration of function '%s'",(char *)err->data);
                        break;
                case ERR_ARGLENLONG:
                        sprintf(buf,"Argument list too long in redeclaration of function '%s'",(char*)err->data);
                        break;
                case ERR_DECLMISMATCH:
                        sprintf(buf,"Type mismatch in redeclaration of '%s'",(char *)err->data);
                        break;
                case ERR_CALLMISMATCH:
                        sprintf(buf,"Type mismatch in arg %s",(char *)err->data);
                        break;
                case ERR_CALLLENSHORT:
                        sprintf(buf,"Argument list too short %s",(char *)err->data);
                        break;
                case ERR_CALLLENLONG:
                        sprintf(buf,"Argument list too long %s",(char *)err->data);
                        errlvl = 1;
                        break;
                case ERR_LABEL:
                        sprintf(buf,"'%s' is not a label",(char *)err->data);
                        break;
                case ERR_NOPOINTER:
                        sprintf(buf,"Pointer type expected");
                        break;
                case ERR_LVALUE:
                        sprintf(buf,"Lvalue expected");
                        break;
                case ERR_NOFUNC:
                        sprintf(buf,"'%s' is not a function",(char *)err->data);
                        break;
                case ERR_MISMATCH:
                        sprintf(buf,"Type mismatch");
                        break;
                case ERR_ELSE:
                        sprintf(buf,"Misplaced else");
                        break;
                case ERR_EXPREXPECT:
                        sprintf(buf,"Expression expected");
                        break;
                case ERR_DEREF:
                        sprintf(buf,"Illegal pointer");
                        break;
                case ERR_UNEXPECT:
                        if (lastst == id)
                                sprintf(buf,"Unexpected '%s'",lastid);
                        else
                                sprintf(buf,"Unexpected '%c'",lastch);
                        break;
                case ERR_ILLTYPE:
                        sprintf(buf,"Illegal typedef of '%s'",(char *)err->data);
                        break;
                case ERR_ARRAYMISMATCH:
                        sprintf(buf,"Non-scalar array index");
                        break;
                case ERR_PREPROCMATCH:
                        sprintf(buf,"Unbalanced preprocessor directives");
                        break;
                case ERR_MACROSUBS:
                        sprintf(buf,"Macro substitution error");
                        break;
                case ERR_DECLEXPECT:
                        sprintf(buf,"Declaration expected");
                        break;
                case ERR_INVFLOAT:
                        sprintf(buf,"Invalid floating point");
                        break;
                case ERR_INVTRAP:
                        sprintf(buf,"Invalid trap id");
                        break;
                case ERR_BFILLEGAL:
                        sprintf(buf,"Cannot use bit field as a non-member");
                        break;
                case ERR_BFTOOBIG:
                        sprintf(buf,"Bit field too big");
                        break;
                case ERR_BFTYPE:
                        sprintf(buf,"Bit field only allowed on scalar types");
                        break;
                case ERR_ERROR:
                        sprintf(buf,"User error: %s",(char *)err->data);