1: /* Gforth virtual machine (aka inner interpreter)
2:
3: Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008,2010,2011 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 3
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, see http://www.gnu.org/licenses/.
19: */
20:
21: #if defined(GFORTH_DEBUGGING) || defined(INDIRECT_THREADED) || defined(DOUBLY_INDIRECT) || defined(VM_PROFILING)
22: #define USE_NO_TOS
23: #else
24: #define USE_TOS
25: #endif
26:
27: #include "config.h"
28: #include "forth.h"
29: #include <ctype.h>
30: #include <stdio.h>
31: #include <string.h>
32: #include <math.h>
33: #include <assert.h>
34: #include <stdlib.h>
35: #include <errno.h>
36: #include "io.h"
37: #include "threaded.h"
38: #ifndef STANDALONE
39: #include <sys/types.h>
40: #include <sys/stat.h>
41: #include <fcntl.h>
42: #include <time.h>
43: #include <sys/time.h>
44: #include <unistd.h>
45: #include <pwd.h>
46: #include <dirent.h>
47: #ifdef HAVE_WCHAR_H
48: #include <wchar.h>
49: #endif
50: #include <sys/resource.h>
51: #ifdef HAVE_FNMATCH_H
52: #include <fnmatch.h>
53: #else
54: #include "fnmatch.h"
55: #endif
56: #else
57: /* #include <systypes.h> */
58: #endif
59:
60: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
61: #include <dlfcn.h>
62: #endif
63: #if defined(_WIN32)
64: #include <windows.h>
65: #endif
66: #ifdef hpux
67: #include <dl.h>
68: #endif
69:
70: #ifdef HAS_FFCALL
71: #include <avcall.h>
72: #include <callback.h>
73: #endif
74:
75: #ifndef SEEK_SET
76: /* should be defined in stdio.h, but some systems don't have it */
77: #define SEEK_SET 0
78: #endif
79:
80: #ifndef HAVE_FSEEKO
81: #define fseeko fseek
82: #endif
83:
84: #ifndef HAVE_FTELLO
85: #define ftello ftell
86: #endif
87:
88: #define NULLC '\0'
89:
90: #ifdef MEMCMP_AS_SUBROUTINE
91: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
92: extern Char *gforth_memmove(Char * dest, const Char* src, Cell n);
93: extern Char *gforth_memset(Char * s, Cell c, UCell n);
94: extern Char *gforth_memcpy(Char * dest, const Char* src, Cell n);
95: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
96: #define memmove(a,b,c) gforth_memmove(a,b,c)
97: #define memset(a,b,c) gforth_memset(a,b,c)
98: #define memcpy(a,b,c) gforth_memcpy(a,b,c)
99: #endif
100:
101: #define NEWLINE '\n'
102:
103: /* These two flags control whether divisions are checked by software.
104: The CHECK_DIVISION_SW is for those cases where the event is a
105: division by zero or overflow on the C level, and might be reported
106: by hardware; we might check forr that in autoconf and set the
107: switch appropriately, but currently don't. The CHECK_DIVISION flag
108: is for the other cases. */
109: #ifdef GFORTH_DEBUGGING
110: #define CHECK_DIVISION_SW 1
111: #define CHECK_DIVISION 1
112: #else
113: #define CHECK_DIVISION_SW 0
114: #define CHECK_DIVISION 0
115: #endif
116:
117: /* conversion on fetch */
118:
119: #define vm_Cell2f(_cell,_x) ((_x)=(Bool)(_cell))
120: #define vm_Cell2c(_cell,_x) ((_x)=(Char)(_cell))
121: #define vm_Cell2n(_cell,_x) ((_x)=(Cell)(_cell))
122: #define vm_Cell2w(_cell,_x) ((_x)=(Cell)(_cell))
123: #define vm_Cell2u(_cell,_x) ((_x)=(UCell)(_cell))
124: #define vm_Cell2a_(_cell,_x) ((_x)=(Cell *)(_cell))
125: #define vm_Cell2c_(_cell,_x) ((_x)=(Char *)(_cell))
126: #define vm_Cell2f_(_cell,_x) ((_x)=(Float *)(_cell))
127: #define vm_Cell2df_(_cell,_x) ((_x)=(DFloat *)(_cell))
128: #define vm_Cell2sf_(_cell,_x) ((_x)=(SFloat *)(_cell))
129: #define vm_Cell2xt(_cell,_x) ((_x)=(Xt)(_cell))
130: #define vm_Cell2f83name(_cell,_x) ((_x)=(struct F83Name *)(_cell))
131: #define vm_Cell2longname(_cell,_x) ((_x)=(struct Longname *)(_cell))
132: #define vm_Float2r(_float,_x) (_x=_float)
133:
134: /* conversion on store */
135:
136: #define vm_f2Cell(_x,_cell) ((_cell)=(Cell)(_x))
137: #define vm_c2Cell(_x,_cell) ((_cell)=(Cell)(_x))
138: #define vm_n2Cell(_x,_cell) ((_cell)=(Cell)(_x))
139: #define vm_w2Cell(_x,_cell) ((_cell)=(Cell)(_x))
140: #define vm_u2Cell(_x,_cell) ((_cell)=(Cell)(_x))
141: #define vm_a_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
142: #define vm_c_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
143: #define vm_f_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
144: #define vm_df_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
145: #define vm_sf_2Cell(_x,_cell) ((_cell)=(Cell)(_x))
146: #define vm_xt2Cell(_x,_cell) ((_cell)=(Cell)(_x))
147: #define vm_f83name2Cell(_x,_cell) ((_cell)=(Cell)(_x))
148: #define vm_longname2Cell(_x,_cell) ((_cell)=(Cell)(_x))
149: #define vm_r2Float(_x,_float) (_float=_x)
150:
151: #define vm_Cell2Cell(_x,_y) (_y=_x)
152:
153: #ifdef NO_IP
154: #define IMM_ARG(access,value) (VARIANT(value))
155: #else
156: #define IMM_ARG(access,value) (access)
157: #endif
158:
159: /* if machine.h has not defined explicit registers, define them as implicit */
160: #ifndef IPREG
161: #define IPREG
162: #endif
163: #ifndef SPREG
164: #define SPREG
165: #endif
166: #ifndef RPREG
167: #define RPREG
168: #endif
169: #ifndef FPREG
170: #define FPREG
171: #endif
172: #ifndef LPREG
173: #define LPREG
174: #endif
175: #ifndef CAREG
176: #define CAREG
177: #endif
178: #ifndef CFAREG
179: #define CFAREG
180: #endif
181: #ifndef UPREG
182: #define UPREG
183: #endif
184: #ifndef TOSREG
185: #define TOSREG
186: #endif
187: #ifndef spbREG
188: #define spbREG
189: #endif
190: #ifndef spcREG
191: #define spcREG
192: #endif
193: #ifndef spdREG
194: #define spdREG
195: #endif
196: #ifndef speREG
197: #define speREG
198: #endif
199: #ifndef spfREG
200: #define spfREG
201: #endif
202: #ifndef spgREG
203: #define spgREG
204: #endif
205: #ifndef sphREG
206: #define sphREG
207: #endif
208: #ifndef FTOSREG
209: #define FTOSREG
210: #endif
211:
212: #ifndef CPU_DEP1
213: # define CPU_DEP1 0
214: #endif
215:
216: /* instructions containing SUPER_END must be the last instruction of a
217: super-instruction (e.g., branches, EXECUTE, and other instructions
218: ending the basic block). Instructions containing SET_IP get this
219: automatically, so you usually don't have to write it. If you have
220: to write it, write it after IP points to the next instruction.
221: Used for profiling. Don't write it in a word containing SET_IP, or
222: the following block will be counted twice. */
223: #ifdef VM_PROFILING
224: #define SUPER_END vm_count_block(IP)
225: #else
226: #define SUPER_END
227: #endif
228: #define SUPER_CONTINUE
229:
230: #ifdef ASMCOMMENT
231: /* an individualized asm statement so that (hopefully) gcc's optimizer
232: does not do cross-jumping */
233: #define asmcomment(string) asm(ASMCOMMENT string)
234: #else
235: /* we don't know how to do an asm comment, so we just do an empty asm */
236: #define asmcomment(string) asm("")
237: #endif
238:
239: #define DEPTHOFF 4
240: #ifdef GFORTH_DEBUGGING
241: #if DEBUG
242: #define NAME(string) { saved_ip=ip; asmcomment(string); fprintf(stderr,"%08lx depth=%3ld tos=%016lx: "string"\n",(Cell)ip,sp0+DEPTHOFF-sp,sp[0]);}
243: #else /* !DEBUG */
244: #define NAME(string) { saved_ip=ip; asm(""); }
245: /* the asm here is to avoid reordering of following stuff above the
246: assignment; this is an old-style asm (no operands), and therefore
247: is treated like "asm volatile ..."; i.e., it prevents most
248: reorderings across itself. We want the assignment above first,
249: because the stack loads may already cause a stack underflow. */
250: #endif /* !DEBUG */
251: #elif DEBUG
252: # define NAME(string) {Cell __depth=sp0+DEPTHOFF-sp; int i; fprintf(stderr,"%08lx depth=%3ld: "string,(Cell)ip,sp0+DEPTHOFF-sp); for (i=__depth-1; i>0; i--) fprintf(stderr, " $%lx",sp[i]); fprintf(stderr, " $%lx\n",spTOS); }
253: #else
254: # define NAME(string) asmcomment(string);
255: #endif
256:
257: #ifdef DEBUG
258: #define CFA_TO_NAME(__cfa) \
259: Cell len, i; \
260: char * name = __cfa; \
261: for(i=0; i<32; i+=sizeof(Cell)) { \
262: len = ((Cell*)name)[-1]; \
263: if(len < 0) { \
264: len &= 0x1F; \
265: if((len+sizeof(Cell)) > i) break; \
266: } len = 0; \
267: name -= sizeof(Cell); \
268: }
269: #endif
270:
271: #ifdef STANDALONE
272: jmp_buf throw_jmp_buf;
273:
274: void throw(int code)
275: {
276: longjmp(throw_jmp_buf,code); /* !! or use siglongjmp ? */
277: }
278: #endif
279:
280: #if defined(HAS_FFCALL) || defined(HAS_LIBFFI)
281: #define SAVE_REGS IF_fpTOS(fp[0]=fpTOS); gforth_SP=sp; gforth_FP=fp; gforth_RP=rp; gforth_LP=lp;
282: #define REST_REGS sp=gforth_SP; fp=gforth_FP; rp=gforth_RP; lp=gforth_LP; IF_fpTOS(fpTOS=fp[0]);
283: #endif
284:
285: #if !defined(ENGINE)
286: /* normal engine */
287: #define VARIANT(v) (v)
288: #define JUMP(target) goto I_noop
289: #define LABEL(name) H_##name: asm(""); I_##name:
290: #define LABEL3(name) J_##name: asm("");
291:
292: #elif ENGINE==2
293: /* variant with padding between VM instructions for finding out
294: cross-inst jumps (for dynamic code) */
295: #define gforth_engine gforth_engine2
296: #define VARIANT(v) (v)
297: #define JUMP(target) goto I_noop
298: #define LABEL(name) H_##name: SKIP16; I_##name:
299: /* the SKIP16 after LABEL3 is there, because the ARM gcc may place
300: some constants after the final branch, and may refer to them from
301: the code before label3. Since we don't copy the constants, we have
302: to make sure that such code is recognized as non-relocatable. */
303: #define LABEL3(name) J_##name: SKIP16;
304:
305: #elif ENGINE==3
306: /* variant with different immediate arguments for finding out
307: immediate arguments (for native code) */
308: #define gforth_engine gforth_engine3
309: #define VARIANT(v) ((v)^0xffffffff)
310: #define JUMP(target) goto K_lit
311: #define LABEL(name) H_##name: asm(""); I_##name:
312: #define LABEL3(name) J_##name: asm("");
313: #else
314: #error illegal ENGINE value
315: #endif /* ENGINE */
316:
317: /* the asm(""); is there to get a stop compiled on Itanium */
318: #define LABEL2(name) K_##name: asm("");
319:
320: Label *gforth_engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0 sr_proto)
321: /* executes code at ip, if ip!=NULL
322: returns array of machine code labels (for use in a loader), if ip==NULL
323: */
324: {
325: #if defined(GFORTH_DEBUGGING)
326: #if defined(GLOBALS_NONRELOC)
327: register saved_regs *saved_regs_p TOSREG = saved_regs_p0;
328: #endif /* defined(GLOBALS_NONRELOC) */
329: #else /* !defined(GFORTH_DEBUGGING) */
330: register Cell *rp RPREG;
331: #endif /* !defined(GFORTH_DEBUGGING) */
332: #ifndef NO_IP
333: register Xt *ip IPREG = ip0;
334: #endif
335: register Cell *sp SPREG = sp0;
336: register Float *fp FPREG = fp0;
337: register Address lp LPREG = lp0;
338: register Xt cfa CFAREG;
339: register Label real_ca CAREG;
340: #ifdef MORE_VARS
341: MORE_VARS
342: #endif
343: #ifdef HAS_FFCALL
344: av_alist alist;
345: extern va_alist gforth_clist;
346: float frv;
347: int irv;
348: double drv;
349: long long llrv;
350: void * prv;
351: #endif
352: register Address up UPREG = gforth_UP;
353: #if !defined(GFORTH_DEBUGGING)
354: register Cell MAYBE_UNUSED spTOS TOSREG;
355: register Cell MAYBE_UNUSED spb spbREG;
356: register Cell MAYBE_UNUSED spc spcREG;
357: register Cell MAYBE_UNUSED spd spdREG;
358: register Cell MAYBE_UNUSED spe speREG;
359: register Cell MAYBE_UNUSED spf spfREG;
360: register Cell MAYBE_UNUSED spg spgREG;
361: register Cell MAYBE_UNUSED sph sphREG;
362: IF_fpTOS(register Float fpTOS FTOSREG;)
363: #endif /* !defined(GFORTH_DEBUGGING) */
364: #if defined(DOUBLY_INDIRECT)
365: static Label *symbols;
366: static void *routines[]= {
367: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
368: #else /* !defined(DOUBLY_INDIRECT) */
369: static Label symbols[]= {
370: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
371: #endif /* !defined(DOUBLY_INDIRECT) */
372: #define INST_ADDR(name) ((Label)&&I_##name)
373: #include PRIM_LAB_I
374: #undef INST_ADDR
375: (Label)0,
376: #define INST_ADDR(name) ((Label)&&K_##name)
377: #include PRIM_LAB_I
378: #undef INST_ADDR
379: #define INST_ADDR(name) ((Label)&&J_##name)
380: #include PRIM_LAB_I
381: #undef INST_ADDR
382: (Label)&&after_last,
383: (Label)&&before_goto,
384: (Label)&&after_goto,
385: /* just mention the H_ labels, so the SKIP16s are not optimized away */
386: #define INST_ADDR(name) ((Label)&&H_##name)
387: #include PRIM_LAB_I
388: #undef INST_ADDR
389: };
390: #ifdef STANDALONE
391: #define INST_ADDR(name) ((Label)&&I_##name)
392: #include "image.i"
393: #undef INST_ADDR
394: #endif
395: #ifdef CPU_DEP2
396: CPU_DEP2
397: #endif
398:
399: rp = rp0;
400: #ifdef DEBUG
401: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
402: (unsigned)ip0,(unsigned)sp,(unsigned)rp,
403: (unsigned)fp,(unsigned)lp,(unsigned)up);
404: #endif
405:
406: if (ip0 == NULL) {
407: #if defined(DOUBLY_INDIRECT)
408: #define CODE_OFFSET (26*sizeof(Cell))
409: #define XT_OFFSET (22*sizeof(Cell))
410: int i;
411: Cell code_offset = offset_image? CODE_OFFSET : 0;
412: Cell xt_offset = offset_image? XT_OFFSET : 0;
413:
414: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
415: xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
416: for (i=0; i<DOER_MAX+1; i++)
417: xts[i] = symbols[i] = (Label)routines[i];
418: for (; routines[i]!=0; i++) {
419: if (i>=MAX_SYMBOLS) {
420: fprintf(stderr,"gforth-ditc: more than %ld primitives\n",(long)MAX_SYMBOLS);
421: exit(1);
422: }
423: xts[i] = symbols[i] = &routines[i];
424: }
425: #endif /* defined(DOUBLY_INDIRECT) */
426: #ifdef STANDALONE
427: return image;
428: #else
429: return symbols;
430: #endif
431: }
432:
433: #ifdef USE_TOS
434: sp += STACK_CACHE_DEFAULT-1;
435: /* some of those registers are dead, but its simpler to initialize them all */ spTOS = sp[0];
436: spb = sp[-1];
437: spc = sp[-2];
438: spd = sp[-3];
439: spe = sp[-4];
440: spf = sp[-5];
441: spg = sp[-6];
442: sph = sp[-7];
443: #endif
444:
445: IF_fpTOS(fpTOS = fp[0]);
446: /* prep_terminal(); */
447: #ifdef NO_IP
448: goto *(*(Label *)ip0);
449: before_goto:
450: goto *real_ca;
451: after_goto:;
452: #else
453: SET_IP(ip);
454: SUPER_END; /* count the first block, too */
455: FIRST_NEXT;
456: #endif
457:
458: #ifdef CPU_DEP3
459: CPU_DEP3
460: #endif
461:
462: #include PRIM_I
463: after_last: return (Label *)0;
464: /*needed only to get the length of the last primitive */
465:
466: return (Label *)0;
467: }
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