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