1: /* Gforth virtual machine (aka inner interpreter)
2:
3: Copyright (C) 1995,1996,1997,1998,2000,2003,2004 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: #if defined(GFORTH_DEBUGGING) || defined(INDIRECT_THREADED) || defined(DOUBLY_INDIRECT) || defined(VM_PROFILING)
23: #define USE_NO_TOS
24: #else
25: #define USE_TOS
26: #endif
27: #define USE_NO_FTOS
28:
29: #include "config.h"
30: #include "forth.h"
31: #include <ctype.h>
32: #include <stdio.h>
33: #include <string.h>
34: #include <math.h>
35: #include <assert.h>
36: #include <stdlib.h>
37: #include <errno.h>
38: #include "io.h"
39: #include "threaded.h"
40: #ifndef STANDALONE
41: #include <sys/types.h>
42: #include <sys/stat.h>
43: #include <fcntl.h>
44: #include <time.h>
45: #include <sys/time.h>
46: #include <unistd.h>
47: #include <pwd.h>
48: #include <dirent.h>
49: #include <sys/resource.h>
50: #ifdef HAVE_FNMATCH_H
51: #include <fnmatch.h>
52: #else
53: #include "fnmatch.h"
54: #endif
55: #else
56: #include "systypes.h"
57: #endif
58:
59: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
60: #include <dlfcn.h>
61: #endif
62: #if defined(_WIN32)
63: #include <windows.h>
64: #endif
65: #ifdef hpux
66: #include <dl.h>
67: #endif
68:
69: #ifdef HAS_FFCALL
70: #include <avcall.h>
71: #include <callback.h>
72: #endif
73:
74: #ifndef SEEK_SET
75: /* should be defined in stdio.h, but some systems don't have it */
76: #define SEEK_SET 0
77: #endif
78:
79: #ifndef HAVE_FSEEKO
80: #define fseeko fseek
81: #endif
82:
83: #ifndef HAVE_FTELLO
84: #define ftello ftell
85: #endif
86:
87: #define NULLC '\0'
88:
89: #ifdef MEMCMP_AS_SUBROUTINE
90: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
91: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
92: #endif
93:
94: #define NEWLINE '\n'
95:
96: /* conversion on fetch */
97:
98: #define vm_Cell2f(_cell,_x) ((_x)=(Bool)(_cell))
99: #define vm_Cell2c(_cell,_x) ((_x)=(Char)(_cell))
100: #define vm_Cell2n(_cell,_x) ((_x)=(Cell)(_cell))
101: #define vm_Cell2w(_cell,_x) ((_x)=(Cell)(_cell))
102: #define vm_Cell2u(_cell,_x) ((_x)=(UCell)(_cell))
103: #define vm_Cell2a_(_cell,_x) ((_x)=(Cell *)(_cell))
104: #define vm_Cell2c_(_cell,_x) ((_x)=(Char *)(_cell))
105: #define vm_Cell2f_(_cell,_x) ((_x)=(Float *)(_cell))
106: #define vm_Cell2df_(_cell,_x) ((_x)=(DFloat *)(_cell))
107: #define vm_Cell2sf_(_cell,_x) ((_x)=(SFloat *)(_cell))
108: #define vm_Cell2xt(_cell,_x) ((_x)=(Xt)(_cell))
109: #define vm_Cell2f83name(_cell,_x) ((_x)=(struct F83Name *)(_cell))
110: #define vm_Cell2longname(_cell,_x) ((_x)=(struct Longname *)(_cell))
111: #define vm_Float2r(_float,_x) (_x=_float)
112:
113: /* conversion on store */
114:
115: #define vm_f2Cell(_x,_cell) ((_cell)=(Cell)(_x))
116: #define vm_c2Cell(_x,_cell) ((_cell)=(Cell)(_x))
117: #define vm_n2Cell(_x,_cell) ((_cell)=(Cell)(_x))
118: #define vm_w2Cell(_x,_cell) ((_cell)=(Cell)(_x))
119: #define vm_u2Cell(_x,_cell) ((_cell)=(Cell)(_x))
120: #define vm_a_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
121: #define vm_c_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
122: #define vm_f_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
123: #define vm_df_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
124: #define vm_sf_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
125: #define vm_xt2Cell(_x,_cell) ((_cell)=(Cell)(_x))
126: #define vm_f83name2Cell(_x,_cell) ((_cell)=(Cell)(_x))
127: #define vm_longname2Cell(_x,_cell) ((_cell)=(Cell)(_x))
128: #define vm_r2Float(_x,_float) (_float=_x)
129:
130: #define vm_Cell2Cell(_x,_y) (_y=_x)
131:
132: #ifdef NO_IP
133: #define IMM_ARG(access,value) (VARIANT(value))
134: #else
135: #define IMM_ARG(access,value) (access)
136: #endif
137:
138: /* if machine.h has not defined explicit registers, define them as implicit */
139: #ifndef IPREG
140: #define IPREG
141: #endif
142: #ifndef SPREG
143: #define SPREG
144: #endif
145: #ifndef RPREG
146: #define RPREG
147: #endif
148: #ifndef FPREG
149: #define FPREG
150: #endif
151: #ifndef LPREG
152: #define LPREG
153: #endif
154: #ifndef CAREG
155: #define CAREG
156: #endif
157: #ifndef CFAREG
158: #define CFAREG
159: #endif
160: #ifndef UPREG
161: #define UPREG
162: #endif
163: #ifndef TOSREG
164: #define TOSREG
165: #endif
166: #ifndef spbREG
167: #define spbREG
168: #endif
169: #ifndef spcREG
170: #define spcREG
171: #endif
172: #ifndef spdREG
173: #define spdREG
174: #endif
175: #ifndef speREG
176: #define speREG
177: #endif
178: #ifndef FTOSREG
179: #define FTOSREG
180: #endif
181:
182: #ifndef CPU_DEP1
183: # define CPU_DEP1 0
184: #endif
185:
186: /* instructions containing SUPER_END must be the last instruction of a
187: super-instruction (e.g., branches, EXECUTE, and other instructions
188: ending the basic block). Instructions containing SET_IP get this
189: automatically, so you usually don't have to write it. If you have
190: to write it, write it after IP points to the next instruction.
191: Used for profiling. Don't write it in a word containing SET_IP, or
192: the following block will be counted twice. */
193: #ifdef VM_PROFILING
194: #define SUPER_END vm_count_block(IP)
195: #else
196: #define SUPER_END
197: #endif
198: #define SUPER_CONTINUE
199:
200: #ifdef GFORTH_DEBUGGING
201: #if DEBUG
202: #define NAME(string) { saved_ip=ip; asm("# "string); fprintf(stderr,"%08lx depth=%3ld: "string"\n",(Cell)ip,sp0+3-sp);}
203: #else /* !DEBUG */
204: #define NAME(string) { saved_ip=ip; asm(""); }
205: /* the asm here is to avoid reordering of following stuff above the
206: assignment; this is an old-style asm (no operands), and therefore
207: is treated like "asm volatile ..."; i.e., it prevents most
208: reorderings across itself. We want the assignment above first,
209: because the stack loads may already cause a stack underflow. */
210: #endif /* !DEBUG */
211: #elif DEBUG
212: # define NAME(string) {Cell __depth=sp0+3-sp; int i; fprintf(stderr,"%08lx depth=%3ld: "string,(Cell)ip,sp0+3-sp); for (i=__depth-1; i>0; i--) fprintf(stderr, " $%lx",sp[i]); fprintf(stderr, " $%lx\n",spTOS); }
213: #else
214: # define NAME(string) asm("# "string);
215: #endif
216:
217: #ifdef DEBUG
218: #define CFA_TO_NAME(__cfa) \
219: Cell len, i; \
220: char * name = __cfa; \
221: for(i=0; i<32; i+=sizeof(Cell)) { \
222: len = ((Cell*)name)[-1]; \
223: if(len < 0) { \
224: len &= 0x1F; \
225: if((len+sizeof(Cell)) > i) break; \
226: } len = 0; \
227: name -= sizeof(Cell); \
228: }
229: #endif
230:
231: #ifdef HAS_FFCALL
232: #define SAVE_REGS IF_fpTOS(fp[0]=fpTOS); SP=sp; FP=fp; RP=rp; LP=lp;
233: #define REST_REGS sp=SP; fp=FP; rp=RP; lp=LP; IF_fpTOS(fpTOS=fp[0]);
234: #endif
235:
236: #if !defined(ENGINE)
237: /* normal engine */
238: #define VARIANT(v) (v)
239: #define JUMP(target) goto I_noop
240: #define LABEL(name) H_##name: I_##name:
241:
242: #elif ENGINE==2
243: /* variant with padding between VM instructions for finding out
244: cross-inst jumps (for dynamic code) */
245: #define engine engine2
246: #define VARIANT(v) (v)
247: #define JUMP(target) goto I_noop
248: #define LABEL(name) H_##name: SKIP16; I_##name:
249: #define IN_ENGINE2
250:
251: #elif ENGINE==3
252: /* variant with different immediate arguments for finding out
253: immediate arguments (for native code) */
254: #define engine engine3
255: #define VARIANT(v) ((v)^0xffffffff)
256: #define JUMP(target) goto K_lit
257: #define LABEL(name) H_##name: I_##name:
258: #else
259: #error illegal ENGINE value
260: #endif /* ENGINE */
261:
262: /* the asm(""); is there to get a stop compiled on Itanium */
263: #define LABEL2(name) K_##name: asm("");
264: #define LABEL3(name) J_##name: asm("");
265:
266: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
267: /* executes code at ip, if ip!=NULL
268: returns array of machine code labels (for use in a loader), if ip==NULL
269: */
270: {
271: #ifndef GFORTH_DEBUGGING
272: register Cell *rp RPREG;
273: #endif
274: #ifndef NO_IP
275: register Xt *ip IPREG = ip0;
276: #endif
277: register Cell *sp SPREG = sp0;
278: register Float *fp FPREG = fp0;
279: register Address lp LPREG = lp0;
280: register Xt cfa CFAREG;
281: register Label real_ca CAREG;
282: #ifdef MORE_VARS
283: MORE_VARS
284: #endif
285: #ifdef HAS_FFCALL
286: av_alist alist;
287: extern va_alist clist;
288: float frv;
289: int irv;
290: double drv;
291: long long llrv;
292: void * prv;
293: #endif
294: register Address up UPREG = UP;
295: register Cell MAYBE_UNUSED spTOS TOSREG;
296: register Cell MAYBE_UNUSED spb spbREG;
297: register Cell MAYBE_UNUSED spc spcREG;
298: register Cell MAYBE_UNUSED spd spdREG;
299: register Cell MAYBE_UNUSED spe speREG;
300: IF_fpTOS(register Float fpTOS FTOSREG;)
301: #if defined(DOUBLY_INDIRECT)
302: static Label *symbols;
303: static void *routines[]= {
304: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
305: #else /* !defined(DOUBLY_INDIRECT) */
306: static Label symbols[]= {
307: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
308: #endif /* !defined(DOUBLY_INDIRECT) */
309: #define INST_ADDR(name) ((Label)&&I_##name)
310: #include PRIM_LAB_I
311: #undef INST_ADDR
312: (Label)0,
313: #define INST_ADDR(name) ((Label)&&K_##name)
314: #include PRIM_LAB_I
315: #undef INST_ADDR
316: #define INST_ADDR(name) ((Label)&&J_##name)
317: #include PRIM_LAB_I
318: #undef INST_ADDR
319: (Label)&&after_last,
320: (Label)&&before_goto,
321: (Label)&&after_goto,
322: /* just mention the H_ labels, so the SKIP16s are not optimized away */
323: #define INST_ADDR(name) ((Label)&&H_##name)
324: #include PRIM_LAB_I
325: #undef INST_ADDR
326: };
327: #ifdef CPU_DEP2
328: CPU_DEP2
329: #endif
330:
331: rp = rp0;
332: #ifdef DEBUG
333: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
334: (unsigned)ip0,(unsigned)sp,(unsigned)rp,
335: (unsigned)fp,(unsigned)lp,(unsigned)up);
336: #endif
337:
338: if (ip0 == NULL) {
339: #if defined(DOUBLY_INDIRECT)
340: #define CODE_OFFSET (26*sizeof(Cell))
341: #define XT_OFFSET (22*sizeof(Cell))
342: int i;
343: Cell code_offset = offset_image? CODE_OFFSET : 0;
344: Cell xt_offset = offset_image? XT_OFFSET : 0;
345:
346: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
347: xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
348: for (i=0; i<DOESJUMP+1; i++)
349: xts[i] = symbols[i] = (Label)routines[i];
350: for (; routines[i]!=0; i++) {
351: if (i>=MAX_SYMBOLS) {
352: fprintf(stderr,"gforth-ditc: more than %ld primitives\n",(long)MAX_SYMBOLS);
353: exit(1);
354: }
355: xts[i] = symbols[i] = &routines[i];
356: }
357: #endif /* defined(DOUBLY_INDIRECT) */
358: return symbols;
359: }
360:
361: #if STACK_CACHE_DEFAULT>0
362: sp += STACK_CACHE_DEFAULT-1;
363: #endif
364:
365: #if STACK_CACHE_DEFAULT>0
366: spTOS = sp[0];
367: #endif
368: #if STACK_CACHE_DEFAULT>1
369: spb = sp[-1];
370: #endif
371: #if STACK_CACHE_DEFAULT>2
372: spc = sp[-2];
373: #endif
374: #if STACK_CACHE_DEFAULT>3
375: spd = sp[-3];
376: #endif
377: #if STACK_CACHE_DEFAULT>4
378: spe = sp[-4];
379: #endif
380:
381: IF_fpTOS(fpTOS = fp[0]);
382: /* prep_terminal(); */
383: #ifdef NO_IP
384: goto *(*(Label *)ip0);
385: before_goto:
386: goto *real_ca;
387: after_goto:;
388: #else
389: SET_IP(ip);
390: SUPER_END; /* count the first block, too */
391: FIRST_NEXT;
392: #endif
393:
394: #ifdef CPU_DEP3
395: CPU_DEP3
396: #endif
397:
398: #include PRIM_I
399: after_last: return (Label *)0;
400: /*needed only to get the length of the last primitive */
401:
402: return (Label *)0;
403: }
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