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: #define IOR(flag) ((flag)? -512-errno : 0)
68:
69: struct F83Name {
70: struct F83Name *next; /* the link field for old hands */
71: char countetc;
72: char name[0];
73: };
74:
75: #define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
76:
77: struct Longname {
78: struct Longname *next; /* the link field for old hands */
79: Cell countetc;
80: char name[0];
81: };
82:
83: #define LONGNAME_COUNT(np) ((np)->countetc & (((~((UCell)0))<<3)>>3))
84:
85: #define NULLC '\0'
86:
87: #ifdef MEMCMP_AS_SUBROUTINE
88: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
89: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
90: #endif
91:
92: #define NEWLINE '\n'
93:
94: /* conversion on fetch */
95:
96: #define vm_Cell2f(_cell,_x) ((_x)=(Bool)(_cell))
97: #define vm_Cell2c(_cell,_x) ((_x)=(Char)(_cell))
98: #define vm_Cell2n(_cell,_x) ((_x)=(Cell)(_cell))
99: #define vm_Cell2w(_cell,_x) ((_x)=(Cell)(_cell))
100: #define vm_Cell2u(_cell,_x) ((_x)=(UCell)(_cell))
101: #define vm_Cell2a_(_cell,_x) ((_x)=(Cell *)(_cell))
102: #define vm_Cell2c_(_cell,_x) ((_x)=(Char *)(_cell))
103: #define vm_Cell2f_(_cell,_x) ((_x)=(Float *)(_cell))
104: #define vm_Cell2df_(_cell,_x) ((_x)=(DFloat *)(_cell))
105: #define vm_Cell2sf_(_cell,_x) ((_x)=(SFloat *)(_cell))
106: #define vm_Cell2xt(_cell,_x) ((_x)=(Xt)(_cell))
107: #define vm_Cell2f83name(_cell,_x) ((_x)=(struct F83Name *)(_cell))
108: #define vm_Cell2longname(_cell,_x) ((_x)=(struct Longname *)(_cell))
109: #define vm_Float2r(_float,_x) (_x=_float)
110:
111: /* conversion on store */
112:
113: #define vm_f2Cell(_x,_cell) ((_cell)=(Cell)(_x))
114: #define vm_c2Cell(_x,_cell) ((_cell)=(Cell)(_x))
115: #define vm_n2Cell(_x,_cell) ((_cell)=(Cell)(_x))
116: #define vm_w2Cell(_x,_cell) ((_cell)=(Cell)(_x))
117: #define vm_u2Cell(_x,_cell) ((_cell)=(Cell)(_x))
118: #define vm_a_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
119: #define vm_c_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
120: #define vm_f_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
121: #define vm_df_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
122: #define vm_sf_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
123: #define vm_xt2Cell(_x,_cell) ((_cell)=(Cell)(_x))
124: #define vm_f83name2Cell(_x,_cell) ((_cell)=(Cell)(_x))
125: #define vm_longname2Cell(_x,_cell) ((_cell)=(Cell)(_x))
126: #define vm_r2Float(_x,_float) (_float=_x)
127:
128: #define vm_Cell2Cell(_x,_y) (_y=_x)
129:
130: #ifdef NO_IP
131: #define IMM_ARG(access,value) (VARIANT(value))
132: #else
133: #define IMM_ARG(access,value) (access)
134: #endif
135:
136: /* if machine.h has not defined explicit registers, define them as implicit */
137: #ifndef IPREG
138: #define IPREG
139: #endif
140: #ifndef SPREG
141: #define SPREG
142: #endif
143: #ifndef RPREG
144: #define RPREG
145: #endif
146: #ifndef FPREG
147: #define FPREG
148: #endif
149: #ifndef LPREG
150: #define LPREG
151: #endif
152: #ifndef CFAREG
153: #define CFAREG
154: #endif
155: #ifndef UPREG
156: #define UPREG
157: #endif
158: #ifndef TOSREG
159: #define TOSREG
160: #endif
161: #ifndef FTOSREG
162: #define FTOSREG
163: #endif
164:
165: #ifndef CPU_DEP1
166: # define CPU_DEP1 0
167: #endif
168:
169: /* instructions containing these must be the last instruction of a
170: super-instruction (e.g., branches, EXECUTE, and other instructions
171: ending the basic block). Instructions containing SET_IP get this
172: automatically, so you usually don't have to write it. If you have
173: to write it, write it after IP points to the next instruction.
174: Used for profiling. Don't write it in a word containing SET_IP, or
175: the following block will be counted twice. */
176: #ifdef VM_PROFILING
177: #define SUPER_END vm_count_block(IP)
178: #else
179: #define SUPER_END
180: #endif
181: #define SUPER_CONTINUE
182:
183: #ifdef DEBUG
184: #define CFA_TO_NAME(__cfa) \
185: Cell len, i; \
186: char * name = __cfa; \
187: for(i=0; i<32; i+=sizeof(Cell)) { \
188: len = ((Cell*)name)[-1]; \
189: if(len < 0) { \
190: len &= 0x1F; \
191: if((len+sizeof(Cell)) > i) break; \
192: } len = 0; \
193: name -= sizeof(Cell); \
194: }
195: #endif
196:
197: #if !defined(ENGINE)
198: /* normal engine */
199: #define VARIANT(v) (v)
200: #define JUMP(target) goto I_noop
201: #define LABEL(name) J_##name: asm(""); I_##name:
202:
203: #elif ENGINE==2
204: /* variant with padding between VM instructions for finding out
205: cross-inst jumps (for dynamic code) */
206: #define engine engine2
207: #define VARIANT(v) (v)
208: #define JUMP(target) goto I_noop
209: #define LABEL(name) J_##name: asm(".skip 16"); I_##name:
210: #define IN_ENGINE2
211:
212: #elif ENGINE==3
213: /* variant with different immediate arguments for finding out
214: immediate arguments (for native code) */
215: #define engine engine3
216: #define VARIANT(v) ((v)^0xffffffff)
217: #define JUMP(target) goto K_lit
218: #define LABEL(name) J_##name: asm(""); I_##name:
219: #else
220: #error illegal ENGINE value
221: #endif /* ENGINE */
222:
223: #define LABEL2(name) K_##name:
224:
225:
226: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
227: /* executes code at ip, if ip!=NULL
228: returns array of machine code labels (for use in a loader), if ip==NULL
229: */
230: {
231: #ifndef GFORTH_DEBUGGING
232: register Cell *rp RPREG;
233: #endif
234: #ifndef NO_IP
235: register Xt *ip IPREG = ip0;
236: #endif
237: register Cell *sp SPREG = sp0;
238: register Float *fp FPREG = fp0;
239: register Address lp LPREG = lp0;
240: register Xt cfa CFAREG;
241: #ifdef MORE_VARS
242: MORE_VARS
243: #endif
244: register Address up UPREG = UP;
245: IF_spTOS(register Cell spTOS TOSREG;)
246: IF_fpTOS(register Float fpTOS FTOSREG;)
247: #if defined(DOUBLY_INDIRECT)
248: static Label *symbols;
249: static void *routines[]= {
250: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
251: #else /* !defined(DOUBLY_INDIRECT) */
252: static Label symbols[]= {
253: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
254: #endif /* !defined(DOUBLY_INDIRECT) */
255: (Label)&&docol,
256: (Label)&&docon,
257: (Label)&&dovar,
258: (Label)&&douser,
259: (Label)&&dodefer,
260: (Label)&&dofield,
261: (Label)&&dodoes,
262: /* the following entry is normally unused;
263: it is there because its index indicates a does-handler */
264: CPU_DEP1,
265: #define INST_ADDR(name) (Label)&&I_##name
266: #include "prim_lab.i"
267: #undef INST_ADDR
268: (Label)&&after_last,
269: (Label)0,
270: #define INST_ADDR(name) (Label)&&K_##name
271: #include "prim_lab.i"
272: #undef INST_ADDR
273: #define INST_ADDR(name) (Label)&&J_##name
274: #include "prim_lab.i"
275: #undef INST_ADDR
276: };
277: #ifdef CPU_DEP2
278: CPU_DEP2
279: #endif
280:
281: rp = rp0;
282: #ifdef DEBUG
283: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
284: (unsigned)ip0,(unsigned)sp,(unsigned)rp,
285: (unsigned)fp,(unsigned)lp,(unsigned)up);
286: #endif
287:
288: if (ip0 == NULL) {
289: #if defined(DOUBLY_INDIRECT)
290: #define CODE_OFFSET (26*sizeof(Cell))
291: #define XT_OFFSET (22*sizeof(Cell))
292: int i;
293: Cell code_offset = offset_image? CODE_OFFSET : 0;
294: Cell xt_offset = offset_image? XT_OFFSET : 0;
295:
296: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
297: xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
298: for (i=0; i<DOESJUMP+1; i++)
299: xts[i] = symbols[i] = (Label)routines[i];
300: for (; routines[i]!=0; i++) {
301: if (i>=MAX_SYMBOLS) {
302: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
303: exit(1);
304: }
305: xts[i] = symbols[i] = &routines[i];
306: }
307: #endif /* defined(DOUBLY_INDIRECT) */
308: return symbols;
309: }
310:
311: IF_spTOS(spTOS = sp[0]);
312: IF_fpTOS(fpTOS = fp[0]);
313: /* prep_terminal(); */
314: #ifdef NO_IP
315: goto *(*(Label *)ip0);
316: #else
317: SET_IP(ip);
318: SUPER_END; /* count the first block, too */
319: NEXT;
320: #endif
321:
322: #ifdef CPU_DEP3
323: CPU_DEP3
324: #endif
325:
326: docol:
327: {
328: #ifdef NO_IP
329: *--rp = next_code;
330: goto **(Label *)PFA1(cfa);
331: #else
332: #ifdef DEBUG
333: {
334: CFA_TO_NAME(cfa);
335: fprintf(stderr,"%08lx: col: %08lx %.*s\n",(Cell)ip,(Cell)PFA1(cfa),
336: len,name);
337: }
338: #endif
339: #ifdef CISC_NEXT
340: /* this is the simple version */
341: *--rp = (Cell)ip;
342: SET_IP((Xt *)PFA1(cfa));
343: SUPER_END;
344: NEXT;
345: #else
346: /* this one is important, so we help the compiler optimizing */
347: {
348: DEF_CA
349: rp[-1] = (Cell)ip;
350: SET_IP((Xt *)PFA1(cfa));
351: SUPER_END;
352: NEXT_P1;
353: rp--;
354: NEXT_P2;
355: }
356: #endif
357: #endif
358: }
359:
360: docon:
361: {
362: #ifdef DEBUG
363: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
364: #endif
365: #ifdef USE_TOS
366: *sp-- = spTOS;
367: spTOS = *(Cell *)PFA1(cfa);
368: #else
369: *--sp = *(Cell *)PFA1(cfa);
370: #endif
371: }
372: #ifdef NO_IP
373: goto *next_code;
374: #else
375: NEXT_P0;
376: NEXT;
377: #endif
378:
379: dovar:
380: {
381: #ifdef DEBUG
382: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
383: #endif
384: #ifdef USE_TOS
385: *sp-- = spTOS;
386: spTOS = (Cell)PFA1(cfa);
387: #else
388: *--sp = (Cell)PFA1(cfa);
389: #endif
390: }
391: #ifdef NO_IP
392: goto *next_code;
393: #else
394: NEXT_P0;
395: NEXT;
396: #endif
397:
398: douser:
399: {
400: #ifdef DEBUG
401: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
402: #endif
403: #ifdef USE_TOS
404: *sp-- = spTOS;
405: spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
406: #else
407: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
408: #endif
409: }
410: #ifdef NO_IP
411: goto *next_code;
412: #else
413: NEXT_P0;
414: NEXT;
415: #endif
416:
417: dodefer:
418: {
419: #ifdef DEBUG
420: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
421: #endif
422: SUPER_END;
423: EXEC(*(Xt *)PFA1(cfa));
424: }
425:
426: dofield:
427: {
428: #ifdef DEBUG
429: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
430: #endif
431: spTOS += *(Cell*)PFA1(cfa);
432: }
433: #ifdef NO_IP
434: goto *next_code;
435: #else
436: NEXT_P0;
437: NEXT;
438: #endif
439:
440: dodoes:
441: /* this assumes the following structure:
442: defining-word:
443:
444: ...
445: DOES>
446: (possible padding)
447: possibly handler: jmp dodoes
448: (possible branch delay slot(s))
449: Forth code after DOES>
450:
451: defined word:
452:
453: cfa: address of or jump to handler OR
454: address of or jump to dodoes, address of DOES-code
455: pfa:
456:
457: */
458: #ifdef NO_IP
459: *--rp = next_code;
460: IF_spTOS(spTOS = sp[0]);
461: sp--;
462: spTOS = (Cell)PFA(cfa);
463: goto **(Label *)DOES_CODE1(cfa);
464: #else
465: {
466: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
467: #ifdef DEBUG
468: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
469: fflush(stderr);
470: #endif
471: *--rp = (Cell)ip;
472: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
473: #ifdef USE_TOS
474: *sp-- = spTOS;
475: spTOS = (Cell)PFA(cfa);
476: #else
477: *--sp = (Cell)PFA(cfa);
478: #endif
479: SET_IP(DOES_CODE1(cfa));
480: SUPER_END;
481: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
482: }
483: NEXT;
484: #endif
485:
486: #include "prim.i"
487: after_last: return (Label *)0;
488: /*needed only to get the length of the last primitive */
489: }
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