usr/src/usr.bin/pascal/pdx/machine.h

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)machine.h   5.1 (Berkeley) %G%
 */

/*
 * Definitions for the machine module.
 *
 * This module has the low level machine interface.  This consists
 * mostly of dealing with machine instructions and also setting
 * and unsetting breakpoints.
 */

ADDRESS pc;                     /* current program counter */
LINENO curline;                 /* line number associated with pc */
SYM *curfunc;                   /* pointer to active function symbol */
short errnum;                   /* current error number */

setbp();                        /* set a breakpoint */
unsetbp();                      /* unset a breakpoint */
BOOLEAN isbperr();              /* test if a breakpoint has occurred */
printerror();                   /* print out an execution error message */
ADDRESS nextaddr();             /* address of next line to be executed */
BOOLEAN isendofproc();          /* test if address is at end of procedure */
printinst(), printninst();      /* print the instruction at a given address */
printdata(), printndata();      /* print the contents of a given data address */