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