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1.1 root 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 5.1 (Berkeley) 6/5/85
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: #define STDLVL ((struct iorec *)(0x7ffffff1))
50: #define GLVL ((struct iorec *)(0x7ffffff0))
51: #endif ADDR32
52: #ifdef ADDR16
53: #define STDLVL ((struct iorec *)(0xfff1))
54: #define GLVL ((struct iorec *)(0xfff0))
55: #endif ADDR16
56: #define FILNIL ((struct iorec *)(0))
57: #define INPUT ((struct iorec *)(&input))
58: #define OUTPUT ((struct iorec *)(&output))
59: #define ERR ((struct iorec *)(&_err))
60: #define PX 0 /* normal run of px */
61: #define PIX 1 /* load and go */
62: #define PIPE 2 /* bootstrap via a pipe */
63: #define PDX 3 /* invoked by the debugger "pdx" */
64: #define releq 0
65: #define relne 2
66: #define rellt 4
67: #define relgt 6
68: #define relle 8
69: #define relge 10
70: typedef enum {FALSE, TRUE} bool;
71:
72: /*
73: * interrupt and allocation routines
74: */
75: extern long createtime;
76: extern char *PALLOC();
77: extern char *malloc();
78: extern long time();
79: extern intr();
80: extern memsize();
81: extern syserr();
82: extern liberr();
83:
84: /*
85: * stack routines and structures
86: */
87: struct sze8 {
88: char element[8];
89: };
90: extern short pop2();
91: extern long pop4();
92: extern double pop8();
93: extern struct sze8 popsze8();
94: extern char *pushsp();
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: };
108:
109: /*
110: * THE RUNTIME DISPLAY
111: *
112: * The entries in the display point to the active static block marks.
113: * The first entry in the display is for the global variables,
114: * then the procedure or function at level one, etc.
115: * Each display entry points to a stack frame as shown:
116: *
117: * base of stack frame
118: * ---------------
119: * | |
120: * | block mark |
121: * | |
122: * --------------- <-- display entry "stp" points here
123: * | | <-- display entry "locvars" points here
124: * | local |
125: * | variables |
126: * | |
127: * ---------------
128: * | |
129: * | expression |
130: * | temporary |
131: * | storage |
132: * | |
133: * - - - - - - - -
134: *
135: * The information in the block mark is thus at positive offsets from
136: * the display.stp pointer entries while the local variables are at negative
137: * offsets from display.locvars. The block mark actually consists of
138: * two parts. The first part is created at CALL and the second at entry,
139: * i.e. BEGIN. Thus:
140: *
141: * -------------------------
142: * | |
143: * | Saved lino |
144: * | Saved lc |
145: * | Saved dp |
146: * | |
147: * -------------------------
148: * | |
149: * | Saved (dp) |
150: * | |
151: * | Pointer to current |
152: * | routine header info |
153: * | |
154: * | Saved value of |
155: * | "curfile" |
156: * | |
157: * | Empty tos value |
158: * | |
159: * -------------------------
160: */
161:
162: /*
163: * program variables
164: */
165: extern union display _display; /* runtime display */
166: extern struct dispsave *_dp; /* ptr to active frame */
167: extern long _lino; /* current line number */
168: extern int _argc; /* number of passed args */
169: extern char **_argv; /* values of passed args */
170: extern bool _nodump; /* TRUE => no post mortum dump */
171: extern long _runtst; /* TRUE => runtime tests */
172: extern long _mode; /* execl by PX, PIPE, or PIX */
173: extern long _stlim; /* statement limit */
174: extern long _stcnt; /* statement count */
175: extern long _seed; /* random number seed */
176: extern char *_maxptr; /* maximum valid pointer */
177: extern char *_minptr; /* minimum valid pointer */
178: extern long *_pcpcount; /* pointer to pxp buffer */
179: extern long _cntrs; /* number of counters */
180: extern long _rtns; /* number of routine cntrs */
181:
182: /*
183: * The file i/o routines maintain a notion of a "current file".
184: * A pointer to this file structure is kept in "curfile".
185: *
186: * file structures
187: */
188: struct iorechd {
189: char *fileptr; /* ptr to file window */
190: long lcount; /* number of lines printed */
191: long llimit; /* maximum number of text lines */
192: FILE *fbuf; /* FILE ptr */
193: struct iorec *fchain; /* chain to next file */
194: struct iorec *flev; /* ptr to associated file variable */
195: char *pfname; /* ptr to name of file */
196: short funit; /* file status flags */
197: short fblk; /* index into active file table */
198: long fsize; /* size of elements in the file */
199: char fname[NAMSIZ]; /* name of associated UNIX file */
200: };
201:
202: struct iorec {
203: char *fileptr; /* ptr to file window */
204: long lcount; /* number of lines printed */
205: long llimit; /* maximum number of text lines */
206: FILE *fbuf; /* FILE ptr */
207: struct iorec *fchain; /* chain to next file */
208: struct iorec *flev; /* ptr to associated file variable */
209: char *pfname; /* ptr to name of file */
210: short funit; /* file status flags */
211: short fblk; /* index into active file table */
212: long fsize; /* size of elements in the file */
213: char fname[NAMSIZ]; /* name of associated UNIX file */
214: char buf[BUFSIZ]; /* I/O buffer */
215: char window[1]; /* file window element */
216: };
217:
218: /*
219: * unit flags
220: */
221: #define FDEF 0x80 /* 1 => reserved file name */
222: #define FTEXT 0x40 /* 1 => text file, process EOLN */
223: #define FWRITE 0x20 /* 1 => open for writing */
224: #define FREAD 0x10 /* 1 => open for reading */
225: #define TEMP 0x08 /* 1 => temporary file */
226: #define SYNC 0x04 /* 1 => window is out of sync */
227: #define EOLN 0x02 /* 1 => at end of line */
228: #define EOFF 0x01 /* 1 => at end of file */
229:
230: /*
231: * file routines
232: */
233: extern struct iorec *GETNAME();
234: extern char *MKTEMP();
235:
236: /*
237: * file record variables
238: */
239: extern struct iorechd _fchain; /* head of active file chain */
240: extern struct iorec *_actfile[]; /* table of active files */
241: extern long _filefre; /* last used entry in _actfile */
242:
243: /*
244: * standard files
245: */
246: extern struct iorechd input;
247: extern struct iorechd output;
248: extern struct iorechd _err;
249:
250: /*
251: * Px execution profile array
252: */
253: #ifdef PROFILE
254: #define NUMOPS 256
255: extern long _profcnts[NUMOPS];
256: #endif PROFILE
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