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 spfREG
179: #define spfREG
180: #endif
181: #ifndef spgREG
182: #define spgREG
183: #endif
184: #ifndef sphREG
185: #define sphREG
186: #endif
187: #ifndef FTOSREG
188: #define FTOSREG
189: #endif
190:
191: #ifndef CPU_DEP1
192: # define CPU_DEP1 0
193: #endif
194:
195: /* instructions containing SUPER_END must be the last instruction of a
196: super-instruction (e.g., branches, EXECUTE, and other instructions
197: ending the basic block). Instructions containing SET_IP get this
198: automatically, so you usually don't have to write it. If you have
199: to write it, write it after IP points to the next instruction.
200: Used for profiling. Don't write it in a word containing SET_IP, or
201: the following block will be counted twice. */
202: #ifdef VM_PROFILING
203: #define SUPER_END vm_count_block(IP)
204: #else
205: #define SUPER_END
206: #endif
207: #define SUPER_CONTINUE
208:
209: #ifdef GFORTH_DEBUGGING
210: #if DEBUG
211: #define NAME(string) { saved_ip=ip; asm("# "string); fprintf(stderr,"%08lx depth=%3ld: "string"\n",(Cell)ip,sp0+3-sp);}
212: #else /* !DEBUG */
213: #define NAME(string) { saved_ip=ip; asm(""); }
214: /* the asm here is to avoid reordering of following stuff above the
215: assignment; this is an old-style asm (no operands), and therefore
216: is treated like "asm volatile ..."; i.e., it prevents most
217: reorderings across itself. We want the assignment above first,
218: because the stack loads may already cause a stack underflow. */
219: #endif /* !DEBUG */
220: #elif DEBUG
221: # 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); }
222: #else
223: # define NAME(string) asm("# "string);
224: #endif
225:
226: #ifdef DEBUG
227: #define CFA_TO_NAME(__cfa) \
228: Cell len, i; \
229: char * name = __cfa; \
230: for(i=0; i<32; i+=sizeof(Cell)) { \
231: len = ((Cell*)name)[-1]; \
232: if(len < 0) { \
233: len &= 0x1F; \
234: if((len+sizeof(Cell)) > i) break; \
235: } len = 0; \
236: name -= sizeof(Cell); \
237: }
238: #endif
239:
240: #ifdef HAS_FFCALL
241: #define SAVE_REGS IF_fpTOS(fp[0]=fpTOS); SP=sp; FP=fp; RP=rp; LP=lp;
242: #define REST_REGS sp=SP; fp=FP; rp=RP; lp=LP; IF_fpTOS(fpTOS=fp[0]);
243: #endif
244:
245: #if !defined(ENGINE)
246: /* normal engine */
247: #define VARIANT(v) (v)
248: #define JUMP(target) goto I_noop
249: #define LABEL(name) H_##name: asm(""); I_##name:
250:
251: #elif ENGINE==2
252: /* variant with padding between VM instructions for finding out
253: cross-inst jumps (for dynamic code) */
254: #define engine engine2
255: #define VARIANT(v) (v)
256: #define JUMP(target) goto I_noop
257: #define LABEL(name) H_##name: SKIP16; I_##name:
258: #define IN_ENGINE2
259:
260: #elif ENGINE==3
261: /* variant with different immediate arguments for finding out
262: immediate arguments (for native code) */
263: #define engine engine3
264: #define VARIANT(v) ((v)^0xffffffff)
265: #define JUMP(target) goto K_lit
266: #define LABEL(name) H_##name: asm(""); I_##name:
267: #else
268: #error illegal ENGINE value
269: #endif /* ENGINE */
270:
271: /* the asm(""); is there to get a stop compiled on Itanium */
272: #define LABEL2(name) K_##name: asm("");
273: #define LABEL3(name) J_##name: asm("");
274:
275: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
276: /* executes code at ip, if ip!=NULL
277: returns array of machine code labels (for use in a loader), if ip==NULL
278: */
279: {
280: #ifndef GFORTH_DEBUGGING
281: register Cell *rp RPREG;
282: #endif
283: #ifndef NO_IP
284: register Xt *ip IPREG = ip0;
285: #endif
286: register Cell *sp SPREG = sp0;
287: register Float *fp FPREG = fp0;
288: register Address lp LPREG = lp0;
289: register Xt cfa CFAREG;
290: register Label real_ca CAREG;
291: #ifdef MORE_VARS
292: MORE_VARS
293: #endif
294: #ifdef HAS_FFCALL
295: av_alist alist;
296: extern va_alist clist;
297: float frv;
298: int irv;
299: double drv;
300: long long llrv;
301: void * prv;
302: #endif
303: register Address up UPREG = UP;
304: register Cell MAYBE_UNUSED spTOS TOSREG;
305: register Cell MAYBE_UNUSED spb spbREG;
306: register Cell MAYBE_UNUSED spc spcREG;
307: register Cell MAYBE_UNUSED spd spdREG;
308: register Cell MAYBE_UNUSED spe speREG;
309: register Cell MAYBE_UNUSED spf speREG;
310: register Cell MAYBE_UNUSED spg speREG;
311: register Cell MAYBE_UNUSED sph speREG;
312: IF_fpTOS(register Float fpTOS FTOSREG;)
313: #if defined(DOUBLY_INDIRECT)
314: static Label *symbols;
315: static void *routines[]= {
316: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
317: #else /* !defined(DOUBLY_INDIRECT) */
318: static Label symbols[]= {
319: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
320: #endif /* !defined(DOUBLY_INDIRECT) */
321: #define INST_ADDR(name) ((Label)&&I_##name)
322: #include PRIM_LAB_I
323: #undef INST_ADDR
324: (Label)0,
325: #define INST_ADDR(name) ((Label)&&K_##name)
326: #include PRIM_LAB_I
327: #undef INST_ADDR
328: #define INST_ADDR(name) ((Label)&&J_##name)
329: #include PRIM_LAB_I
330: #undef INST_ADDR
331: (Label)&&after_last,
332: (Label)&&before_goto,
333: (Label)&&after_goto,
334: /* just mention the H_ labels, so the SKIP16s are not optimized away */
335: #define INST_ADDR(name) ((Label)&&H_##name)
336: #include PRIM_LAB_I
337: #undef INST_ADDR
338: };
339: #ifdef CPU_DEP2
340: CPU_DEP2
341: #endif
342:
343: rp = rp0;
344: #ifdef DEBUG
345: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
346: (unsigned)ip0,(unsigned)sp,(unsigned)rp,
347: (unsigned)fp,(unsigned)lp,(unsigned)up);
348: #endif
349:
350: if (ip0 == NULL) {
351: #if defined(DOUBLY_INDIRECT)
352: #define CODE_OFFSET (26*sizeof(Cell))
353: #define XT_OFFSET (22*sizeof(Cell))
354: int i;
355: Cell code_offset = offset_image? CODE_OFFSET : 0;
356: Cell xt_offset = offset_image? XT_OFFSET : 0;
357:
358: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
359: xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
360: for (i=0; i<DOESJUMP+1; i++)
361: xts[i] = symbols[i] = (Label)routines[i];
362: for (; routines[i]!=0; i++) {
363: if (i>=MAX_SYMBOLS) {
364: fprintf(stderr,"gforth-ditc: more than %ld primitives\n",(long)MAX_SYMBOLS);
365: exit(1);
366: }
367: xts[i] = symbols[i] = &routines[i];
368: }
369: #endif /* defined(DOUBLY_INDIRECT) */
370: return symbols;
371: }
372:
373: #if !(defined(GFORTH_DEBUGGING) || defined(INDIRECT_THREADED) || defined(DOUBLY_INDIRECT) || defined(VM_PROFILING))
374: sp += STACK_CACHE_DEFAULT-1;
375: /* some of those registers are dead, but its simpler to initialize them all */ spTOS = sp[0];
376: spb = sp[-1];
377: spc = sp[-2];
378: spd = sp[-3];
379: spe = sp[-4];
380: spf = sp[-5];
381: spg = sp[-6];
382: sph = sp[-7];
383: #endif
384:
385: IF_fpTOS(fpTOS = fp[0]);
386: /* prep_terminal(); */
387: #ifdef NO_IP
388: goto *(*(Label *)ip0);
389: before_goto:
390: goto *real_ca;
391: after_goto:;
392: #else
393: SET_IP(ip);
394: SUPER_END; /* count the first block, too */
395: FIRST_NEXT;
396: #endif
397:
398: #ifdef CPU_DEP3
399: CPU_DEP3
400: #endif
401:
402: #include PRIM_I
403: after_last: return (Label *)0;
404: /*needed only to get the length of the last primitive */
405:
406: return (Label *)0;
407: }
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