1: /* Gforth virtual machine (aka inner interpreter)
2:
3: Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
4:
5: This file is part of Gforth.
6:
7: Gforth is free software; you can redistribute it and/or
8: modify it under the terms of the GNU General Public License
9: as published by the Free Software Foundation; either version 2
10: of the License, or (at your option) any later version.
11:
12: This program is distributed in the hope that it will be useful,
13: but WITHOUT ANY WARRANTY; without even the implied warranty of
14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: GNU General Public License for more details.
16:
17: You should have received a copy of the GNU General Public License
18: along with this program; if not, write to the Free Software
19: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20: */
21:
22: undefine(`symbols')
23:
24: #include "config.h"
25: #include "forth.h"
26: #include <ctype.h>
27: #include <stdio.h>
28: #include <string.h>
29: #include <math.h>
30: #include <assert.h>
31: #include <stdlib.h>
32: #include <errno.h>
33: #include "io.h"
34: #include "threaded.h"
35: #ifndef STANDALONE
36: #include <sys/types.h>
37: #include <sys/stat.h>
38: #include <fcntl.h>
39: #include <time.h>
40: #include <sys/time.h>
41: #include <unistd.h>
42: #include <pwd.h>
43: #include <dirent.h>
44: #include <sys/resource.h>
45: #ifdef HAVE_FNMATCH_H
46: #include <fnmatch.h>
47: #else
48: #include "fnmatch.h"
49: #endif
50: #else
51: #include "systypes.h"
52: #endif
53:
54: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
55: #include <dlfcn.h>
56: #endif
57: #if defined(_WIN32)
58: #include <windows.h>
59: #endif
60: #ifdef hpux
61: #include <dl.h>
62: #endif
63:
64: #ifndef SEEK_SET
65: /* should be defined in stdio.h, but some systems don't have it */
66: #define SEEK_SET 0
67: #endif
68:
69: #define IOR(flag) ((flag)? -512-errno : 0)
70:
71: struct F83Name {
72: struct F83Name *next; /* the link field for old hands */
73: char countetc;
74: char name[0];
75: };
76:
77: #define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
78:
79: struct Longname {
80: struct Longname *next; /* the link field for old hands */
81: Cell countetc;
82: char name[0];
83: };
84:
85: #define LONGNAME_COUNT(np) ((np)->countetc & (((~((UCell)0))<<3)>>3))
86:
87: Cell *SP;
88: Float *FP;
89: Address UP=NULL;
90:
91: #if 0
92: /* not used currently */
93: int emitcounter;
94: #endif
95: #define NULLC '\0'
96:
97: #ifdef MEMCMP_AS_SUBROUTINE
98: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
99: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
100: #endif
101:
102: #define NEWLINE '\n'
103:
104: #ifdef HAS_FILE
105: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
106: static char* pfileattr[6]={"r","r","r+","r+","w","w"};
107:
108: #ifndef O_BINARY
109: #define O_BINARY 0
110: #endif
111: #ifndef O_TEXT
112: #define O_TEXT 0
113: #endif
114:
115: static int ufileattr[6]= {
116: O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
117: O_RDWR |O_BINARY, O_RDWR |O_BINARY,
118: O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
119: #endif
120:
121: /* conversion on fetch */
122:
123: #define vm_Cell2f(_cell,_x) ((_x)=(Bool)(_cell))
124: #define vm_Cell2c(_cell,_x) ((_x)=(Char)(_cell))
125: #define vm_Cell2n(_cell,_x) ((_x)=(Cell)(_cell))
126: #define vm_Cell2w(_cell,_x) ((_x)=(Cell)(_cell))
127: #define vm_Cell2u(_cell,_x) ((_x)=(UCell)(_cell))
128: #define vm_Cell2a_(_cell,_x) ((_x)=(Cell *)(_cell))
129: #define vm_Cell2c_(_cell,_x) ((_x)=(Char *)(_cell))
130: #define vm_Cell2f_(_cell,_x) ((_x)=(Float *)(_cell))
131: #define vm_Cell2df_(_cell,_x) ((_x)=(DFloat *)(_cell))
132: #define vm_Cell2sf_(_cell,_x) ((_x)=(SFloat *)(_cell))
133: #define vm_Cell2xt(_cell,_x) ((_x)=(Xt)(_cell))
134: #define vm_Cell2f83name(_cell,_x) ((_x)=(struct F83Name *)(_cell))
135: #define vm_Cell2longname(_cell,_x) ((_x)=(struct Longname *)(_cell))
136: #define vm_Float2r(_float,_x) (_x=_float)
137:
138: /* conversion on store */
139:
140: #define vm_f2Cell(_x,_cell) ((_cell)=(Cell)(_x))
141: #define vm_c2Cell(_x,_cell) ((_cell)=(Cell)(_x))
142: #define vm_n2Cell(_x,_cell) ((_cell)=(Cell)(_x))
143: #define vm_w2Cell(_x,_cell) ((_cell)=(Cell)(_x))
144: #define vm_u2Cell(_x,_cell) ((_cell)=(Cell)(_x))
145: #define vm_a_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
146: #define vm_c_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
147: #define vm_f_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
148: #define vm_df_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
149: #define vm_sf_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
150: #define vm_xt2Cell(_x,_cell) ((_cell)=(Cell)(_x))
151: #define vm_f83name2Cell(_x,_cell) ((_cell)=(Cell)(_x))
152: #define vm_longname2Cell(_x,_cell) ((_cell)=(Cell)(_x))
153: #define vm_r2Float(_x,_float) (_float=_x)
154:
155: #define vm_Cell2Cell(_x,_y) (_y=_x)
156:
157: #ifdef NO_IP
158: #define IMM_ARG(access,value) (VARIANT(value))
159: #else
160: #define IMM_ARG(access,value) (access)
161: #endif
162:
163: /* if machine.h has not defined explicit registers, define them as implicit */
164: #ifndef IPREG
165: #define IPREG
166: #endif
167: #ifndef SPREG
168: #define SPREG
169: #endif
170: #ifndef RPREG
171: #define RPREG
172: #endif
173: #ifndef FPREG
174: #define FPREG
175: #endif
176: #ifndef LPREG
177: #define LPREG
178: #endif
179: #ifndef CFAREG
180: #define CFAREG
181: #endif
182: #ifndef UPREG
183: #define UPREG
184: #endif
185: #ifndef TOSREG
186: #define TOSREG
187: #endif
188: #ifndef FTOSREG
189: #define FTOSREG
190: #endif
191:
192: #ifndef CPU_DEP1
193: # define CPU_DEP1 0
194: #endif
195:
196: /* instructions containing these must be the last instruction of a
197: super-instruction (e.g., branches, EXECUTE, and other instructions
198: ending the basic block). Instructions containing SET_IP get this
199: automatically, so you usually don't have to write it. If you have
200: to write it, write it after IP points to the next instruction.
201: Used for profiling. Don't write it in a word containing SET_IP, or
202: the following block will be counted twice. */
203: #ifdef VM_PROFILING
204: #define SUPER_END vm_count_block(IP)
205: #else
206: #define SUPER_END
207: #endif
208: #define SUPER_CONTINUE
209:
210: #ifdef GFORTH_DEBUGGING
211: /* define some VM registers as global variables, so they survive exceptions;
212: global register variables are not up to the task (according to the
213: GNU C manual) */
214: Xt *saved_ip;
215: Cell *rp;
216: #endif
217:
218: #ifdef NO_IP
219: static Label next_code;
220: #endif
221:
222: #ifdef DEBUG
223: #define CFA_TO_NAME(__cfa) \
224: Cell len, i; \
225: char * name = __cfa; \
226: for(i=0; i<32; i+=sizeof(Cell)) { \
227: len = ((Cell*)name)[-1]; \
228: if(len < 0) { \
229: len &= 0x1F; \
230: if((len+sizeof(Cell)) > i) break; \
231: } len = 0; \
232: name -= sizeof(Cell); \
233: }
234: #endif
235:
236: define(enginerest,
237: `(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
238: /* executes code at ip, if ip!=NULL
239: returns array of machine code labels (for use in a loader), if ip==NULL
240: */
241: {
242: #ifndef GFORTH_DEBUGGING
243: register Cell *rp RPREG;
244: #endif
245: #ifndef NO_IP
246: register Xt *ip IPREG = ip0;
247: #endif
248: register Cell *sp SPREG = sp0;
249: register Float *fp FPREG = fp0;
250: register Address lp LPREG = lp0;
251: register Xt cfa CFAREG;
252: #ifdef MORE_VARS
253: MORE_VARS
254: #endif
255: register Address up UPREG = UP;
256: IF_spTOS(register Cell spTOS TOSREG;)
257: IF_fpTOS(register Float fpTOS FTOSREG;)
258: #if defined(DOUBLY_INDIRECT)
259: static Label *symbols;
260: static void *routines[]= {
261: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
262: #else /* !defined(DOUBLY_INDIRECT) */
263: static Label symbols[]= {
264: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
265: #endif /* !defined(DOUBLY_INDIRECT) */
266: (Label)&&docol,
267: (Label)&&docon,
268: (Label)&&dovar,
269: (Label)&&douser,
270: (Label)&&dodefer,
271: (Label)&&dofield,
272: (Label)&&dodoes,
273: /* the following entry is normally unused;
274: it is there because its index indicates a does-handler */
275: CPU_DEP1,
276: #define INST_ADDR(name) (Label)&&I_##name
277: #include "prim_lab.i"
278: #undef INST_ADDR
279: (Label)&&after_last,
280: (Label)0,
281: #define INST_ADDR(name) (Label)&&K_##name
282: #include "prim_lab.i"
283: #undef INST_ADDR
284: #ifdef IN_ENGINE2
285: #define INST_ADDR(name) (Label)&&J_##name
286: #include "prim_lab.i"
287: #undef INST_ADDR
288: #endif
289: };
290: #ifdef CPU_DEP2
291: CPU_DEP2
292: #endif
293:
294: rp = rp0;
295: #ifdef DEBUG
296: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
297: (unsigned)ip0,(unsigned)sp,(unsigned)rp,
298: (unsigned)fp,(unsigned)lp,(unsigned)up);
299: #endif
300:
301: if (ip0 == NULL) {
302: #if defined(DOUBLY_INDIRECT)
303: #define CODE_OFFSET (26*sizeof(Cell))
304: #define XT_OFFSET (22*sizeof(Cell))
305: int i;
306: Cell code_offset = offset_image? CODE_OFFSET : 0;
307: Cell xt_offset = offset_image? XT_OFFSET : 0;
308:
309: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
310: xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
311: for (i=0; i<DOESJUMP+1; i++)
312: xts[i] = symbols[i] = (Label)routines[i];
313: for (; routines[i]!=0; i++) {
314: if (i>=MAX_SYMBOLS) {
315: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
316: exit(1);
317: }
318: xts[i] = symbols[i] = &routines[i];
319: }
320: #endif /* defined(DOUBLY_INDIRECT) */
321: return symbols;
322: }
323:
324: IF_spTOS(spTOS = sp[0]);
325: IF_fpTOS(fpTOS = fp[0]);
326: /* prep_terminal(); */
327: #ifdef NO_IP
328: goto *(*(Label *)ip0);
329: #else
330: SET_IP(ip);
331: SUPER_END; /* count the first block, too */
332: NEXT;
333: #endif
334:
335: #ifdef CPU_DEP3
336: CPU_DEP3
337: #endif
338:
339: docol:
340: {
341: #ifdef NO_IP
342: *--rp = next_code;
343: goto **(Label *)PFA1(cfa);
344: #else
345: #ifdef DEBUG
346: {
347: CFA_TO_NAME(cfa);
348: fprintf(stderr,"%08lx: col: %08lx %.*s\n",(Cell)ip,(Cell)PFA1(cfa),
349: len,name);
350: }
351: #endif
352: #ifdef CISC_NEXT
353: /* this is the simple version */
354: *--rp = (Cell)ip;
355: SET_IP((Xt *)PFA1(cfa));
356: SUPER_END;
357: NEXT;
358: #else
359: /* this one is important, so we help the compiler optimizing */
360: {
361: DEF_CA
362: rp[-1] = (Cell)ip;
363: SET_IP((Xt *)PFA1(cfa));
364: SUPER_END;
365: NEXT_P1;
366: rp--;
367: NEXT_P2;
368: }
369: #endif
370: #endif
371: }
372:
373: docon:
374: {
375: #ifdef DEBUG
376: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
377: #endif
378: #ifdef USE_TOS
379: *sp-- = spTOS;
380: spTOS = *(Cell *)PFA1(cfa);
381: #else
382: *--sp = *(Cell *)PFA1(cfa);
383: #endif
384: }
385: #ifdef NO_IP
386: goto *next_code;
387: #else
388: NEXT_P0;
389: NEXT;
390: #endif
391:
392: dovar:
393: {
394: #ifdef DEBUG
395: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
396: #endif
397: #ifdef USE_TOS
398: *sp-- = spTOS;
399: spTOS = (Cell)PFA1(cfa);
400: #else
401: *--sp = (Cell)PFA1(cfa);
402: #endif
403: }
404: #ifdef NO_IP
405: goto *next_code;
406: #else
407: NEXT_P0;
408: NEXT;
409: #endif
410:
411: douser:
412: {
413: #ifdef DEBUG
414: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
415: #endif
416: #ifdef USE_TOS
417: *sp-- = spTOS;
418: spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
419: #else
420: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
421: #endif
422: }
423: #ifdef NO_IP
424: goto *next_code;
425: #else
426: NEXT_P0;
427: NEXT;
428: #endif
429:
430: dodefer:
431: {
432: #ifdef DEBUG
433: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
434: #endif
435: SUPER_END;
436: EXEC(*(Xt *)PFA1(cfa));
437: }
438:
439: dofield:
440: {
441: #ifdef DEBUG
442: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
443: #endif
444: spTOS += *(Cell*)PFA1(cfa);
445: }
446: #ifdef NO_IP
447: goto *next_code;
448: #else
449: NEXT_P0;
450: NEXT;
451: #endif
452:
453: dodoes:
454: /* this assumes the following structure:
455: defining-word:
456:
457: ...
458: DOES>
459: (possible padding)
460: possibly handler: jmp dodoes
461: (possible branch delay slot(s))
462: Forth code after DOES>
463:
464: defined word:
465:
466: cfa: address of or jump to handler OR
467: address of or jump to dodoes, address of DOES-code
468: pfa:
469:
470: */
471: #ifdef NO_IP
472: *--rp = next_code;
473: IF_spTOS(spTOS = sp[0]);
474: sp--;
475: spTOS = (Cell)PFA(cfa);
476: goto **(Label *)DOES_CODE1(cfa);
477: #else
478: {
479: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
480: #ifdef DEBUG
481: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
482: fflush(stderr);
483: #endif
484: *--rp = (Cell)ip;
485: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
486: #ifdef USE_TOS
487: *sp-- = spTOS;
488: spTOS = (Cell)PFA(cfa);
489: #else
490: *--sp = (Cell)PFA(cfa);
491: #endif
492: SET_IP(DOES_CODE1(cfa));
493: SUPER_END;
494: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
495: }
496: NEXT;
497: #endif
498:
499: #ifndef IN_ENGINE2
500: #define LABEL(name) I_##name:
501: #else
502: #define LABEL(name) J_##name: asm(".skip 16"); I_##name:
503: #endif
504: #define LABEL2(name) K_##name:
505: #include "prim.i"
506: #undef LABEL
507: after_last: return (Label *)0;
508: /*needed only to get the length of the last primitive */
509: }'
510: )
511:
512: #define VARIANT(v) (v)
513: #define JUMP(target) goto I_noop
514:
515: Label *engine enginerest
516:
517: #ifndef NO_DYNAMIC
518:
519: #ifdef NO_IP
520: #undef VARIANT
521: #define VARIANT(v) ((v)^0xffffffff)
522: #undef JUMP
523: #define JUMP(target) goto K_lit
524: Label *engine3 enginerest
525: #endif
526:
527: #undef VARIANT
528: #define VARIANT(v) (v)
529: #undef JUMP
530: #define JUMP(target) goto I_noop
531: #define IN_ENGINE2
532: Label *engine2 enginerest
533: #endif
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