1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)vars.h 5.3 (Berkeley) 01/09/89 7 */ 8 9 #include <stdio.h> 10 11 /* 12 * px - Berkeley Pascal interpreter 13 * 14 * Version 4.0, January 1981 15 * 16 * Original version by Ken Thompson 17 * 18 * Substantial revisions by Bill Joy and Chuck Haley 19 * November-December 1976 20 * 21 * Rewritten for VAX 11/780 by Kirk McKusick 22 * Fall 1978 23 * 24 * Rewritten in ``C'' using libpc by Kirk McKusick 25 * Winter 1981 26 * 27 * Px is described in detail in the "PX 4.0 Implementation Notes" 28 * The source code for px is in several major pieces: 29 * 30 * int.c C main program which reads in interpreter code 31 * interp.c Driver including main interpreter loop and 32 * the interpreter instructions grouped by their 33 * positions in the interpreter table. 34 * utilities.c Interpreter exit, backtrace, and runtime statistics. 35 * 36 * In addition there are several headers defining mappings for panic 37 * names into codes, and a definition of the interpreter transfer 38 * table. These are made by the script make.ed1 in this directory and 39 * the routine opc.c from ${PASCALDIR}. (see the makefile for details) 40 */ 41 #define PXPFILE "pmon.out" 42 #define BITSPERBYTE 8 43 #define BITSPERLONG (BITSPERBYTE * sizeof(long)) 44 #define HZ 100 45 #define NAMSIZ 76 46 #define MAXFILES 32 47 #define PREDEF 2 48 #ifdef ADDR32 49 #ifndef tahoe 50 #define STDLVL ((struct iorec *)(0x7ffffff1)) 51 #define GLVL ((struct iorec *)(0x7ffffff0)) 52 #else tahoe 53 #define STDLVL ((struct iorec *)(0xbffffff1)) 54 #define GLVL ((struct iorec *)(0xbffffff0)) 55 #endif tahoe 56 #endif ADDR32 57 #ifdef ADDR16 58 #define STDLVL ((struct iorec *)(0xfff1)) 59 #define GLVL ((struct iorec *)(0xfff0)) 60 #endif ADDR16 61 #define FILNIL ((struct iorec *)(0)) 62 #define INPUT ((struct iorec *)(&input)) 63 #define OUTPUT ((struct iorec *)(&output)) 64 #define ERR ((struct iorec *)(&_err)) 65 #define PX 0 /* normal run of px */ 66 #define PIX 1 /* load and go */ 67 #define PIPE 2 /* bootstrap via a pipe */ 68 #define PDX 3 /* invoked by the debugger "pdx" */ 69 #define releq 0 70 #define relne 2 71 #define rellt 4 72 #define relgt 6 73 #define relle 8 74 #define relge 10 75 typedef enum {FALSE, TRUE} bool; 76 77 /* 78 * interrupt and allocation routines 79 */ 80 extern long createtime; 81 extern char *PALLOC(); 82 extern char *malloc(); 83 extern long time(); 84 extern intr(); 85 extern memsize(); 86 extern syserr(); 87 extern liberr(); 88 89 /* 90 * stack routines and structures 91 */ 92 struct sze8 { 93 char element[8]; 94 }; 95 96 /* 97 * emulated pc types 98 */ 99 union progcntr { 100 char *cp; 101 unsigned char *ucp; 102 short *sp; 103 unsigned short *usp; 104 long *lp; 105 double *dbp; 106 struct hdr *hdrp; 107 struct sze8 *s8p; 108 }; 109 110 /* 111 * THE RUNTIME DISPLAY 112 * 113 * The entries in the display point to the active static block marks. 114 * The first entry in the display is for the global variables, 115 * then the procedure or function at level one, etc. 116 * Each display entry points to a stack frame as shown: 117 * 118 * base of stack frame 119 * --------------- 120 * | | 121 * | block mark | 122 * | | 123 * --------------- <-- display entry "stp" points here 124 * | | <-- display entry "locvars" points here 125 * | local | 126 * | variables | 127 * | | 128 * --------------- 129 * | | 130 * | expression | 131 * | temporary | 132 * | storage | 133 * | | 134 * - - - - - - - - 135 * 136 * The information in the block mark is thus at positive offsets from 137 * the display.stp pointer entries while the local variables are at negative 138 * offsets from display.locvars. The block mark actually consists of 139 * two parts. The first part is created at CALL and the second at entry, 140 * i.e. BEGIN. Thus: 141 * 142 * ------------------------- 143 * | | 144 * | Saved lino | 145 * | Saved lc | 146 * | Saved dp | 147 * | | 148 * ------------------------- 149 * | | 150 * | Saved (dp) | 151 * | | 152 * | Pointer to current | 153 * | routine header info | 154 * | | 155 * | Saved value of | 156 * | "curfile" | 157 * | | 158 * | Empty tos value | 159 * | | 160 * ------------------------- 161 */ 162 163 /* 164 * program variables 165 */ 166 extern union display _display; /* runtime display */ 167 extern struct dispsave *_dp; /* ptr to active frame */ 168 extern long _lino; /* current line number */ 169 extern int _argc; /* number of passed args */ 170 extern char **_argv; /* values of passed args */ 171 extern bool _nodump; /* TRUE => no post mortum dump */ 172 extern long _runtst; /* TRUE => runtime tests */ 173 extern long _mode; /* execl by PX, PIPE, or PIX */ 174 extern long _stlim; /* statement limit */ 175 extern long _stcnt; /* statement count */ 176 extern long _seed; /* random number seed */ 177 extern char *_maxptr; /* maximum valid pointer */ 178 extern char *_minptr; /* minimum valid pointer */ 179 extern long *_pcpcount; /* pointer to pxp buffer */ 180 extern long _cntrs; /* number of counters */ 181 extern long _rtns; /* number of routine cntrs */ 182 183 /* 184 * The file i/o routines maintain a notion of a "current file". 185 * A pointer to this file structure is kept in "curfile". 186 * 187 * file structures 188 */ 189 struct iorechd { 190 char *fileptr; /* ptr to file window */ 191 long lcount; /* number of lines printed */ 192 long llimit; /* maximum number of text lines */ 193 FILE *fbuf; /* FILE ptr */ 194 struct iorec *fchain; /* chain to next file */ 195 struct iorec *flev; /* ptr to associated file variable */ 196 char *pfname; /* ptr to name of file */ 197 short funit; /* file status flags */ 198 short fblk; /* index into active file table */ 199 long fsize; /* size of elements in the file */ 200 char fname[NAMSIZ]; /* name of associated UNIX file */ 201 }; 202 203 struct iorec { 204 char *fileptr; /* ptr to file window */ 205 long lcount; /* number of lines printed */ 206 long llimit; /* maximum number of text lines */ 207 FILE *fbuf; /* FILE ptr */ 208 struct iorec *fchain; /* chain to next file */ 209 struct iorec *flev; /* ptr to associated file variable */ 210 char *pfname; /* ptr to name of file */ 211 short funit; /* file status flags */ 212 short fblk; /* index into active file table */ 213 long fsize; /* size of elements in the file */ 214 char fname[NAMSIZ]; /* name of associated UNIX file */ 215 char buf[BUFSIZ]; /* I/O buffer */ 216 char window[1]; /* file window element */ 217 }; 218 219 /* 220 * unit flags 221 */ 222 #define FDEF 0x80 /* 1 => reserved file name */ 223 #define FTEXT 0x40 /* 1 => text file, process EOLN */ 224 #define FWRITE 0x20 /* 1 => open for writing */ 225 #define FREAD 0x10 /* 1 => open for reading */ 226 #define TEMP 0x08 /* 1 => temporary file */ 227 #define SYNC 0x04 /* 1 => window is out of sync */ 228 #define EOLN 0x02 /* 1 => at end of line */ 229 #define EOFF 0x01 /* 1 => at end of file */ 230 231 /* 232 * file routines 233 */ 234 extern struct iorec *GETNAME(); 235 extern char *MKTEMP(); 236 237 /* 238 * file record variables 239 */ 240 extern struct iorechd _fchain; /* head of active file chain */ 241 extern struct iorec *_actfile[]; /* table of active files */ 242 extern long _filefre; /* last used entry in _actfile */ 243 244 /* 245 * standard files 246 */ 247 extern struct iorechd input; 248 extern struct iorechd output; 249 extern struct iorechd _err; 250 251 /* 252 * Px execution profile array 253 */ 254 #ifdef PROFILE 255 #define NUMOPS 256 256 extern long _profcnts[NUMOPS]; 257 #endif PROFILE 258