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/* xldebug - xlisp debugging support */
/* Copyright (c) 1985, by David Michael Betz
All Rights Reserved
Permission is granted for unrestricted non-commercial use */
/* CHANGE LOG
* --------------------------------------------------------------------
* 28Apr03 dm eliminate some compiler warnings
*/
#include "stdlib.h"
#include "xlisp.h"
/* forward declarations */
FORWARD LVAL stacktop(void);
FORWARD LOCAL void breakloop(const char *hdr, const char *cmsg,
const char *emsg, LVAL arg, int cflag);
/* xlabort - xlisp serious error handler */
void xlabort(const char *emsg)
{
xlsignal(emsg,s_unbound);
xlerrprint("error",(const char *) NULL,emsg,s_unbound);
xlbrklevel();
}
/* xlbreak - enter a break loop */
void xlbreak(const char *emsg, LVAL arg)
{
breakloop("break","return from BREAK",emsg,arg,TRUE);
}
/* xlfail - xlisp error handler */
void xlfail(const char *emsg)
{
xlerror(emsg,s_unbound);
}
/* close_loadingfiles - close files we were loading from */
void close_loadingfiles()
{
/* close open files that are being loaded so that user can
overwrite bug fixes immediately. (Windows locks files
until they are closed.)
*/
while (consp(getvalue(s_loadingfiles)) &&
consp(cdr(getvalue(s_loadingfiles))) &&
streamp(car(cdr(getvalue(s_loadingfiles)))) &&
getfile(car(cdr(getvalue(s_loadingfiles))))) {
osclose(getfile(car(cdr(getvalue(s_loadingfiles)))));
/* make the file NULL so GC will not close it again */
setfile(car(cdr(getvalue(s_loadingfiles))), NULL);
setvalue(s_loadingfiles, cdr(cdr(getvalue(s_loadingfiles))));
}
}
/* xlerror - handle a fatal error */
void xlerror(const char *emsg, LVAL arg)
{
close_loadingfiles();
if (getvalue(s_breakenable) != NIL)
breakloop("error",NULL,emsg,arg,FALSE);
else {
xlsignal(emsg,arg);
xlerrprint("error",NULL,emsg,arg);
xlbrklevel();
}
}
/* xlcerror - handle a recoverable error */
void xlcerror(const char *cmsg, const char *emsg, LVAL arg)
{
if (getvalue(s_breakenable) != NIL)
breakloop("error",cmsg,emsg,arg,TRUE);
else {
xlsignal(emsg,arg);
xlerrprint("error",NULL,emsg,arg);
xlbrklevel();
}
}
/* xlerrprint - print an error message */
void xlerrprint(const char *hdr, const char *cmsg, const char *emsg, LVAL arg)
{
/* print the error message */
sprintf(buf,"%s: %s",hdr,emsg);
errputstr(buf);
/* print the argument */
if (arg != s_unbound) {
errputstr(" - ");
errprint(arg);
}
/* no argument, just end the line */
else
errputstr("\n");
/* print the continuation message */
if (cmsg) {
sprintf(buf,"if continued: %s\n",cmsg);
errputstr(buf);
}
}
/* breakloop - the debug read-eval-print loop */
LOCAL void breakloop(const char *hdr, const char *cmsg,
const char *emsg, LVAL arg, int cflag)
{
LVAL expr,val;
XLCONTEXT cntxt;
int type;
/* print the error message */
xlerrprint(hdr,cmsg,emsg,arg);
/* flush the input buffer */
xlflush();
/* do the back trace */
if (getvalue(s_tracenable)) {
val = getvalue(s_tlimit);
xlbaktrace(fixp(val) ? (int)getfixnum(val) : -1);
}
/* protect some pointers */
xlsave1(expr);
/* increment the debug level */
++xldebug;
/* debug command processing loop */
xlbegin(&cntxt,CF_BRKLEVEL|CF_CLEANUP|CF_CONTINUE,s_true);
for (type = 0; type == 0; ) {
/* setup the continue trap */
if ((type = _setjmp(cntxt.c_jmpbuf)))
switch (type) {
case CF_CLEANUP:
continue;
case CF_BRKLEVEL:
type = 0;
break;
case CF_CONTINUE:
if (cflag) {
dbgputstr("[ continue from break loop ]\n");
continue;
}
else xlabort("this error can't be continued");
}
#ifndef READ_LINE
/* print a prompt */
sprintf(buf,"%d> ",xldebug);
dbgputstr(buf);
#endif
/* read an expression and check for eof */
if (!xlread(getvalue(s_debugio),&expr,FALSE)) {
type = CF_CLEANUP;
#ifdef READ_LINE
dbgputstr("\n");
#endif
break;
}
/* save the input expression */
xlrdsave(expr);
/* evaluate the expression */
expr = xleval(expr);
/* save the result */
xlevsave(expr);
/* print it */
dbgprint(expr);
}
xlend(&cntxt);
/* decrement the debug level */
--xldebug;
/* restore the stack */
xlpop();
/* check for aborting to the previous level */
if (type == CF_CLEANUP)
xlbrklevel();
}
/* baktrace - do a back trace */
void xlbaktrace(int n)
{
LVAL *fp,*p;
int argc;
for (fp = xlfp; (n < 0 || n--) && *fp; fp = fp - (int)getfixnum(*fp)) {
p = fp + 1;
errputstr("Function: ");
errprint(*p++);
if ((argc = (int)getfixnum(*p++)))
errputstr("Arguments:\n");
while (--argc >= 0) {
errputstr(" ");
errprint(*p++);
}
}
}
/* xldinit - debug initialization routine */
void xldinit(void)
{
xlsample = 0;
xldebug = 0;
}
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