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/*
* error.h -- routines for producing error messages.
*
* This source file contains the routines for issuing error messages.
*/
/*
* Prototype.
*/
static char *mapterm (int typ,struct node *val);
/*
* yyerror produces syntax error messages. tok is the offending token
* (yychar), lval is yylval, and state is the parser's state.
*
* errtab is searched for the state, if it is found, the associated
* message is produced; if the state isn't found, "syntax error"
* is produced.
*/
void yyerror(tok, lval, state)
int tok, state;
nodeptr lval;
{
register struct errmsg *p;
int line;
if (lval == NULL)
line = 0;
else
line = Line(lval);
if (tok_loc.n_file)
fprintf(stderr, "File %s; ", tok_loc.n_file);
if (tok == EOFX) /* special case end of file */
fprintf(stderr, "unexpected end of file\n");
else {
fprintf(stderr, "Line %d # ", line);
if (Col(lval))
fprintf(stderr, "\"%s\": ", mapterm(tok,lval));
for (p = errtab; p->e_state != state && p->e_state >= 0; p++) ;
fprintf(stderr, "%s\n", p->e_mesg);
}
tfatals++;
nocode++;
}
/*
* mapterm finds a printable string for the given token type
* and value.
*/
static char *mapterm(typ,val)
int typ;
nodeptr val;
{
register struct toktab *t;
register struct optab *ot;
register int i;
i = typ;
if (i == IDENT || i == INTLIT || i == REALLIT || i == STRINGLIT ||
i == CSETLIT)
return Str0(val);
for (t = toktab; t->t_type != 0; t++)
if (t->t_type == i)
return t->t_word;
for (ot = optab; ot->tok.t_type != 0; ot++)
if (ot->tok.t_type == i)
return ot->tok.t_word;
return "???";
}
/*
* tfatal produces the translator error messages s1 and s2 (if nonnull). The
* location of the error is found in tok_loc.
*/
void tfatal(s1, s2)
char *s1, *s2;
{
if (tok_loc.n_file)
fprintf(stderr, "File %s; ", tok_loc.n_file);
fprintf(stderr, "Line %d # ", tok_loc.n_line);
if (s2)
fprintf(stderr, "\"%s\": ", s2);
fprintf(stderr, "%s\n", s1);
tfatals++;
nocode++;
}
/*
* nfatal produces the error messages s1 and s2 (if nonnull), and associates
* it with source location of node.
*/
void nfatal(n, s1, s2)
nodeptr n;
char *s1, *s2;
{
if (n != NULL) {
fprintf(stderr, "File %s; ", File(n));
fprintf(stderr, "Line %d # ", Line(n));
}
if (s2)
fprintf(stderr, "\"%s\": ", s2);
fprintf(stderr, "%s\n", s1);
tfatals++;
nocode++;
}
/*
* tsyserr is called for fatal errors. The message s is produced and the
* translator exits.
*/
void tsyserr(s)
char *s;
{
if (tok_loc.n_file)
fprintf(stderr, "File %s; ", tok_loc.n_file);
fprintf(stderr, "Line %d # %s\n", in_line, s);
exit(EXIT_FAILURE);
}
/*
* quit - immediate exit with error message
*/
void quit(msg)
char *msg;
{
quitf(msg,"");
}
/*
* quitf - immediate exit with message format and argument
*/
void quitf(msg,arg)
char *msg, *arg;
{
extern char *progname;
extern char *ofile;
fprintf(stderr,"%s: ",progname);
fprintf(stderr,msg,arg);
fprintf(stderr,"\n");
if (ofile)
remove(ofile); /* remove bad icode file */
exit(EXIT_FAILURE);
}
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