usr/src/old/dbx/debug.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

static char sccsid[] = "@(#)debug.c     5.1\t%G%";

static char rcsid[] = "$Header: debug.c,v 1.5 84/12/26 10:39:01 linton Exp $";

/*
 *  Debug routines
 */

#include "defs.h"
#include "tree.h"
#include "operators.h"
#include "eval.h"
#include "events.h"
#include "symbols.h"
#include "scanner.h"
#include "source.h"
#include "object.h"
#include "main.h"
#include "mappings.h"
#include "process.h"
#include "machine.h"
#include "debug.h"
#include <signal.h>

public boolean tracetree;       /* trace building of parse trees */
public boolean traceeval;       /* trace tree evaluation */

/*
 * Dynamically turn on/off a debug flag, or display some information.
 */

public debug (p)
Node p;
{
    int code;

    code = p->value.lcon;
    switch (code) {
        case 0:
            puts("debugging flags:");
            puts("    1        trace scanner return values");
            puts("    2        trace breakpoints");
            puts("    3        trace execution");
            puts("    4        trace tree building");
            puts("    5        trace tree evaluation");
            puts("   -[12345]  turns off corresponding flag");
            puts("    6        dump function table");
            break;

        case 1:
        case -1:
#           ifdef LEXDEBUG
                lexdebug = (boolean) (code > 0);
#           else
                error("can't debug scanner (not compiled with LEXDEBUG)");
#           endif
            break;

        case 2:
        case -2:
            tracebpts = (boolean) (code > 0);
            break;

        case 3:
        case -3:
            traceexec = (boolean) (code > 0);
            break;

        case 4:
        case -4:
            tracetree = (boolean) (code > 0);
            break;

        case 5:
        case -5:
            traceeval = (boolean) (code > 0);
            break;

        case 6:
            dumpfunctab();
            break;

        default:
            error("unknown debug flag");
            break;
    }
}

private String leafname[] = {
    "nop", "name", "sym", "lcon", "fcon", "scon", "rval", "index"
};

public String opname (op)
Operator op;
{
    String s;
    static char buf[100];

    switch (op) {
        case O_ITOF:
            s = "itof";
            break;

        case O_ENDX:
            s = "endx";
            break;

        case O_QLINE:
            s = "qline";
            break;

        default:
            if (ord(op) <= ord(O_INDEX)) {
                s = leafname[ord(op)];
            } else {
                s = opinfo[ord(op)].opstring;
                if (s == nil) {
                    sprintf(buf, "[op %d]", op);
                    s = buf;
                }
            }
            break;
    }
    return s;
}