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: #include "config.h"
23: #include "forth.h"
24: #include <ctype.h>
25: #include <stdio.h>
26: #include <string.h>
27: #include <math.h>
28: #include <assert.h>
29: #include <stdlib.h>
30: #include <errno.h>
31: #include "io.h"
32: #include "threaded.h"
33: #ifndef STANDALONE
34: #include <sys/types.h>
35: #include <sys/stat.h>
36: #include <fcntl.h>
37: #include <time.h>
38: #include <sys/time.h>
39: #include <unistd.h>
40: #include <pwd.h>
41: #include <dirent.h>
42: #include <sys/resource.h>
43: #ifdef HAVE_FNMATCH_H
44: #include <fnmatch.h>
45: #else
46: #include "fnmatch.h"
47: #endif
48: #else
49: #include "systypes.h"
50: #endif
51:
52: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
53: #include <dlfcn.h>
54: #endif
55: #if defined(_WIN32)
56: #include <windows.h>
57: #endif
58: #ifdef hpux
59: #include <dl.h>
60: #endif
61:
62: #ifndef SEEK_SET
63: /* should be defined in stdio.h, but some systems don't have it */
64: #define SEEK_SET 0
65: #endif
66:
67: #ifndef HAVE_FSEEKO
68: #define fseeko fseek
69: #endif
70:
71: #ifndef HAVE_FTELLO
72: #define ftello ftell
73: #endif
74:
75: #define IOR(flag) ((flag)? -512-errno : 0)
76:
77: struct F83Name {
78: struct F83Name *next; /* the link field for old hands */
79: char countetc;
80: char name[0];
81: };
82:
83: #define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
84:
85: struct Longname {
86: struct Longname *next; /* the link field for old hands */
87: Cell countetc;
88: char name[0];
89: };
90:
91: #define LONGNAME_COUNT(np) ((np)->countetc & (((~((UCell)0))<<3)>>3))
92:
93: #define NULLC '\0'
94:
95: #ifdef MEMCMP_AS_SUBROUTINE
96: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
97: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
98: #endif
99:
100: #define NEWLINE '\n'
101:
102: /* conversion on fetch */
103:
104: #define vm_Cell2f(_cell,_x) ((_x)=(Bool)(_cell))
105: #define vm_Cell2c(_cell,_x) ((_x)=(Char)(_cell))
106: #define vm_Cell2n(_cell,_x) ((_x)=(Cell)(_cell))
107: #define vm_Cell2w(_cell,_x) ((_x)=(Cell)(_cell))
108: #define vm_Cell2u(_cell,_x) ((_x)=(UCell)(_cell))
109: #define vm_Cell2a_(_cell,_x) ((_x)=(Cell *)(_cell))
110: #define vm_Cell2c_(_cell,_x) ((_x)=(Char *)(_cell))
111: #define vm_Cell2f_(_cell,_x) ((_x)=(Float *)(_cell))
112: #define vm_Cell2df_(_cell,_x) ((_x)=(DFloat *)(_cell))
113: #define vm_Cell2sf_(_cell,_x) ((_x)=(SFloat *)(_cell))
114: #define vm_Cell2xt(_cell,_x) ((_x)=(Xt)(_cell))
115: #define vm_Cell2f83name(_cell,_x) ((_x)=(struct F83Name *)(_cell))
116: #define vm_Cell2longname(_cell,_x) ((_x)=(struct Longname *)(_cell))
117: #define vm_Float2r(_float,_x) (_x=_float)
118:
119: /* conversion on store */
120:
121: #define vm_f2Cell(_x,_cell) ((_cell)=(Cell)(_x))
122: #define vm_c2Cell(_x,_cell) ((_cell)=(Cell)(_x))
123: #define vm_n2Cell(_x,_cell) ((_cell)=(Cell)(_x))
124: #define vm_w2Cell(_x,_cell) ((_cell)=(Cell)(_x))
125: #define vm_u2Cell(_x,_cell) ((_cell)=(Cell)(_x))
126: #define vm_a_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
127: #define vm_c_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
128: #define vm_f_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
129: #define vm_df_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
130: #define vm_sf_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
131: #define vm_xt2Cell(_x,_cell) ((_cell)=(Cell)(_x))
132: #define vm_f83name2Cell(_x,_cell) ((_cell)=(Cell)(_x))
133: #define vm_longname2Cell(_x,_cell) ((_cell)=(Cell)(_x))
134: #define vm_r2Float(_x,_float) (_float=_x)
135:
136: #define vm_Cell2Cell(_x,_y) (_y=_x)
137:
138: #ifdef NO_IP
139: #define IMM_ARG(access,value) (VARIANT(value))
140: #else
141: #define IMM_ARG(access,value) (access)
142: #endif
143:
144: /* if machine.h has not defined explicit registers, define them as implicit */
145: #ifndef IPREG
146: #define IPREG
147: #endif
148: #ifndef SPREG
149: #define SPREG
150: #endif
151: #ifndef RPREG
152: #define RPREG
153: #endif
154: #ifndef FPREG
155: #define FPREG
156: #endif
157: #ifndef LPREG
158: #define LPREG
159: #endif
160: #ifndef CFAREG
161: #define CFAREG
162: #endif
163: #ifndef UPREG
164: #define UPREG
165: #endif
166: #ifndef TOSREG
167: #define TOSREG
168: #endif
169: #ifndef FTOSREG
170: #define FTOSREG
171: #endif
172:
173: #ifndef CPU_DEP1
174: # define CPU_DEP1 0
175: #endif
176:
177: /* instructions containing these must be the last instruction of a
178: super-instruction (e.g., branches, EXECUTE, and other instructions
179: ending the basic block). Instructions containing SET_IP get this
180: automatically, so you usually don't have to write it. If you have
181: to write it, write it after IP points to the next instruction.
182: Used for profiling. Don't write it in a word containing SET_IP, or
183: the following block will be counted twice. */
184: #ifdef VM_PROFILING
185: #define SUPER_END vm_count_block(IP)
186: #else
187: #define SUPER_END
188: #endif
189: #define SUPER_CONTINUE
190:
191: #ifdef DEBUG
192: #define CFA_TO_NAME(__cfa) \
193: Cell len, i; \
194: char * name = __cfa; \
195: for(i=0; i<32; i+=sizeof(Cell)) { \
196: len = ((Cell*)name)[-1]; \
197: if(len < 0) { \
198: len &= 0x1F; \
199: if((len+sizeof(Cell)) > i) break; \
200: } len = 0; \
201: name -= sizeof(Cell); \
202: }
203: #endif
204:
205: #if !defined(ENGINE)
206: /* normal engine */
207: #define VARIANT(v) (v)
208: #define JUMP(target) goto I_noop
209: #define LABEL(name) J_##name: asm(""); I_##name:
210:
211: #elif ENGINE==2
212: /* variant with padding between VM instructions for finding out
213: cross-inst jumps (for dynamic code) */
214: #define engine engine2
215: #define VARIANT(v) (v)
216: #define JUMP(target) goto I_noop
217: #define LABEL(name) J_##name: SKIP16; I_##name:
218: #define IN_ENGINE2
219:
220: #elif ENGINE==3
221: /* variant with different immediate arguments for finding out
222: immediate arguments (for native code) */
223: #define engine engine3
224: #define VARIANT(v) ((v)^0xffffffff)
225: #define JUMP(target) goto K_lit
226: #define LABEL(name) J_##name: asm(""); I_##name:
227: #else
228: #error illegal ENGINE value
229: #endif /* ENGINE */
230:
231: #define LABEL2(name) K_##name:
232:
233:
234: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
235: /* executes code at ip, if ip!=NULL
236: returns array of machine code labels (for use in a loader), if ip==NULL
237: */
238: {
239: #ifndef GFORTH_DEBUGGING
240: register Cell *rp RPREG;
241: #endif
242: #ifndef NO_IP
243: register Xt *ip IPREG = ip0;
244: #endif
245: register Cell *sp SPREG = sp0;
246: register Float *fp FPREG = fp0;
247: register Address lp LPREG = lp0;
248: register Xt cfa CFAREG;
249: #ifdef MORE_VARS
250: MORE_VARS
251: #endif
252: register Address up UPREG = UP;
253: IF_spTOS(register Cell spTOS TOSREG;)
254: IF_fpTOS(register Float fpTOS FTOSREG;)
255: #if defined(DOUBLY_INDIRECT)
256: static Label *symbols;
257: static void *routines[]= {
258: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
259: #else /* !defined(DOUBLY_INDIRECT) */
260: static Label symbols[]= {
261: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
262: #endif /* !defined(DOUBLY_INDIRECT) */
263: (Label)&&docol,
264: (Label)&&docon,
265: (Label)&&dovar,
266: (Label)&&douser,
267: (Label)&&dodefer,
268: (Label)&&dofield,
269: (Label)&&dodoes,
270: /* the following entry is normally unused;
271: it is there because its index indicates a does-handler */
272: CPU_DEP1,
273: #define INST_ADDR(name) ((Label)&&I_##name)
274: #include "prim_lab.i"
275: #undef INST_ADDR
276: (Label)&&after_last,
277: (Label)0,
278: #define INST_ADDR(name) ((Label)&&K_##name)
279: #include "prim_lab.i"
280: #undef INST_ADDR
281: #define INST_ADDR(name) ((Label)&&J_##name)
282: #include "prim_lab.i"
283: #undef INST_ADDR
284: };
285: #ifdef CPU_DEP2
286: CPU_DEP2
287: #endif
288:
289: rp = rp0;
290: #ifdef DEBUG
291: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
292: (unsigned)ip0,(unsigned)sp,(unsigned)rp,
293: (unsigned)fp,(unsigned)lp,(unsigned)up);
294: #endif
295:
296: if (ip0 == NULL) {
297: #if defined(DOUBLY_INDIRECT)
298: #define CODE_OFFSET (26*sizeof(Cell))
299: #define XT_OFFSET (22*sizeof(Cell))
300: int i;
301: Cell code_offset = offset_image? CODE_OFFSET : 0;
302: Cell xt_offset = offset_image? XT_OFFSET : 0;
303:
304: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
305: xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
306: for (i=0; i<DOESJUMP+1; i++)
307: xts[i] = symbols[i] = (Label)routines[i];
308: for (; routines[i]!=0; i++) {
309: if (i>=MAX_SYMBOLS) {
310: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
311: exit(1);
312: }
313: xts[i] = symbols[i] = &routines[i];
314: }
315: #endif /* defined(DOUBLY_INDIRECT) */
316: return symbols;
317: }
318:
319: IF_spTOS(spTOS = sp[0]);
320: IF_fpTOS(fpTOS = fp[0]);
321: /* prep_terminal(); */
322: #ifdef NO_IP
323: goto *(*(Label *)ip0);
324: #else
325: SET_IP(ip);
326: SUPER_END; /* count the first block, too */
327: NEXT;
328: #endif
329:
330: #ifdef CPU_DEP3
331: CPU_DEP3
332: #endif
333:
334: docol:
335: {
336: #ifdef NO_IP
337: *--rp = next_code;
338: goto **(Label *)PFA1(cfa);
339: #else
340: #ifdef DEBUG
341: {
342: CFA_TO_NAME(cfa);
343: fprintf(stderr,"%08lx: col: %08lx %.*s\n",(Cell)ip,(Cell)PFA1(cfa),
344: len,name);
345: }
346: #endif
347: #ifdef CISC_NEXT
348: /* this is the simple version */
349: *--rp = (Cell)ip;
350: SET_IP((Xt *)PFA1(cfa));
351: SUPER_END;
352: NEXT;
353: #else
354: /* this one is important, so we help the compiler optimizing */
355: {
356: DEF_CA
357: rp[-1] = (Cell)ip;
358: SET_IP((Xt *)PFA1(cfa));
359: SUPER_END;
360: NEXT_P1;
361: rp--;
362: NEXT_P2;
363: }
364: #endif
365: #endif
366: }
367:
368: docon:
369: {
370: #ifdef DEBUG
371: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
372: #endif
373: #ifdef USE_TOS
374: *sp-- = spTOS;
375: spTOS = *(Cell *)PFA1(cfa);
376: #else
377: *--sp = *(Cell *)PFA1(cfa);
378: #endif
379: }
380: #ifdef NO_IP
381: goto *next_code;
382: #else
383: NEXT_P0;
384: NEXT;
385: #endif
386:
387: dovar:
388: {
389: #ifdef DEBUG
390: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
391: #endif
392: #ifdef USE_TOS
393: *sp-- = spTOS;
394: spTOS = (Cell)PFA1(cfa);
395: #else
396: *--sp = (Cell)PFA1(cfa);
397: #endif
398: }
399: #ifdef NO_IP
400: goto *next_code;
401: #else
402: NEXT_P0;
403: NEXT;
404: #endif
405:
406: douser:
407: {
408: #ifdef DEBUG
409: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
410: #endif
411: #ifdef USE_TOS
412: *sp-- = spTOS;
413: spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
414: #else
415: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
416: #endif
417: }
418: #ifdef NO_IP
419: goto *next_code;
420: #else
421: NEXT_P0;
422: NEXT;
423: #endif
424:
425: dodefer:
426: {
427: #ifdef DEBUG
428: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
429: #endif
430: SUPER_END;
431: EXEC(*(Xt *)PFA1(cfa));
432: }
433:
434: dofield:
435: {
436: #ifdef DEBUG
437: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
438: #endif
439: spTOS += *(Cell*)PFA1(cfa);
440: }
441: #ifdef NO_IP
442: goto *next_code;
443: #else
444: NEXT_P0;
445: NEXT;
446: #endif
447:
448: dodoes:
449: /* this assumes the following structure:
450: defining-word:
451:
452: ...
453: DOES>
454: (possible padding)
455: possibly handler: jmp dodoes
456: (possible branch delay slot(s))
457: Forth code after DOES>
458:
459: defined word:
460:
461: cfa: address of or jump to handler OR
462: address of or jump to dodoes, address of DOES-code
463: pfa:
464:
465: */
466: #ifdef NO_IP
467: *--rp = next_code;
468: IF_spTOS(spTOS = sp[0]);
469: sp--;
470: spTOS = (Cell)PFA(cfa);
471: goto **(Label *)DOES_CODE1(cfa);
472: #else
473: {
474: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
475: #ifdef DEBUG
476: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
477: fflush(stderr);
478: #endif
479: *--rp = (Cell)ip;
480: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
481: #ifdef USE_TOS
482: *sp-- = spTOS;
483: spTOS = (Cell)PFA(cfa);
484: #else
485: *--sp = (Cell)PFA(cfa);
486: #endif
487: SET_IP(DOES_CODE1(cfa));
488: SUPER_END;
489: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
490: }
491: NEXT;
492: #endif
493:
494: #include "prim.i"
495: after_last: return (Label *)0;
496: /*needed only to get the length of the last primitive */
497: }
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