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