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Implement SAVE-INPUT and RESTORE-INPUT
[pforth] / csrc / pfcompil.c
CommitLineData
8e9db35f
PB		 1/* @(#) pfcompil.c 98/01/26 1.5 */
2/***************************************************************
3** Compiler for PForth based on 'C'
4**
5** These routines could be left out of an execute only version.
6**
7** Author: Phil Burk
8** Copyright 1994 3DO, Phil Burk, Larry Polansky, David Rosenboom
9**
10** The pForth software code is dedicated to the public domain,
11** and any third party may reproduce, distribute and modify
12** the pForth software code or any derivative works thereof
13** without any compensation or license. The pForth software
14** code is provided on an "as is" basis without any warranty
15** of any kind, including, without limitation, the implied
16** warranties of merchantability and fitness for a particular
17** purpose and their equivalents under the laws of any jurisdiction.
18**
19****************************************************************
20** 941004 PLB Extracted IO calls from pforth_main.c
21** 950320 RDG Added underflow checking for FP stack
22***************************************************************/
23
24#include "pf_all.h"
25#include "pfcompil.h"
26
27#define ABORT_RETURN_CODE (10)
28#define UINT32_MASK ((sizeof(ucell_t)-1))
29
30/***************************************************************/
31/************** Static Prototypes ******************************/
32/***************************************************************/
33
34static void ffStringColon( const ForthStringPtr FName );
35static cell_t CheckRedefinition( const ForthStringPtr FName );
36static void ffUnSmudge( void );
37static cell_t FindAndCompile( const char *theWord );
38static cell_t ffCheckDicRoom( void );
39
40#ifndef PF_NO_INIT
41 static void CreateDeferredC( ExecToken DefaultXT, const char *CName );
42#endif
43
44cell_t NotCompiled( const char *FunctionName )
45{
46 MSG("Function ");
47 MSG(FunctionName);
48 MSG(" not compiled in this version of PForth.\n");
49 return -1;
50}
51
52#ifndef PF_NO_SHELL
53/***************************************************************
54** Create an entry in the Dictionary for the given ExecutionToken.
55** FName is name in Forth format.
56*/
57void CreateDicEntry( ExecToken XT, const ForthStringPtr FName, ucell_t Flags )
58{
59 cfNameLinks *cfnl;
60
61 cfnl = (cfNameLinks *) gCurrentDictionary->dic_HeaderPtr;
62
63/* Set link to previous header, if any. */
64 if( gVarContext )
65 {
66 WRITE_CELL_DIC( &cfnl->cfnl_PreviousName, ABS_TO_NAMEREL( gVarContext ) );
67 }
68 else
69 {
70 cfnl->cfnl_PreviousName = 0;
71 }
72
73/* Put Execution token in header. */
74 WRITE_CELL_DIC( &cfnl->cfnl_ExecToken, XT );
75
76/* Advance Header Dictionary Pointer */
77 gCurrentDictionary->dic_HeaderPtr += sizeof(cfNameLinks);
78
79/* Laydown name. */
80 gVarContext = gCurrentDictionary->dic_HeaderPtr;
81 pfCopyMemory( (uint8_t *) gCurrentDictionary->dic_HeaderPtr, FName, (*FName)+1 );
82 gCurrentDictionary->dic_HeaderPtr += (*FName)+1;
83
84/* Set flags. */
85 *(char*)gVarContext |= (char) Flags;
86
87/* Align to quad byte boundaries with zeroes. */
88 while( gCurrentDictionary->dic_HeaderPtr & UINT32_MASK )
89 {
90 *(char*)(gCurrentDictionary->dic_HeaderPtr++) = 0;
91 }
92}
93
94/***************************************************************
95** Convert name then create dictionary entry.
96*/
97void CreateDicEntryC( ExecToken XT, const char *CName, ucell_t Flags )
98{
99 ForthString FName[40];
100 CStringToForth( FName, CName, sizeof(FName) );
101 CreateDicEntry( XT, FName, Flags );
102}
103
104/***************************************************************
105** Convert absolute namefield address to previous absolute name
106** field address or NULL.
107*/
108const ForthString *NameToPrevious( const ForthString *NFA )
109{
110 cell_t RelNamePtr;
111 const cfNameLinks *cfnl;
112
113/* DBUG(("\nNameToPrevious: NFA = 0x%x\n", (cell_t) NFA)); */
114 cfnl = (const cfNameLinks *) ( ((const char *) NFA) - sizeof(cfNameLinks) );
115
116 RelNamePtr = READ_CELL_DIC((const cell_t *) (&cfnl->cfnl_PreviousName));
117/* DBUG(("\nNameToPrevious: RelNamePtr = 0x%x\n", (cell_t) RelNamePtr )); */
118 if( RelNamePtr )
119 {
120 return ( (ForthString *) NAMEREL_TO_ABS( RelNamePtr ) );
121 }
122 else
123 {
124 return NULL;
125 }
126}
127/***************************************************************
128** Convert NFA to ExecToken.
129*/
130ExecToken NameToToken( const ForthString *NFA )
131{
132 const cfNameLinks *cfnl;
133
134/* Convert absolute namefield address to absolute link field address. */
135 cfnl = (const cfNameLinks *) ( ((const char *) NFA) - sizeof(cfNameLinks) );
136
137 return READ_CELL_DIC((const cell_t *) (&cfnl->cfnl_ExecToken));
138}
139
140/***************************************************************
141** Find XTs needed by compiler.
142*/
143cell_t FindSpecialXTs( void )
144{
145 if( ffFindC( "(QUIT)", &gQuitP_XT ) == 0) goto nofind;
146 if( ffFindC( "NUMBER?", &gNumberQ_XT ) == 0) goto nofind;
147 if( ffFindC( "ACCEPT", &gAcceptP_XT ) == 0) goto nofind;
148DBUG(("gNumberQ_XT = 0x%x\n", (unsigned int)gNumberQ_XT ));
149 return 0;
150
151nofind:
152 ERR("FindSpecialXTs failed!\n");
153 return -1;
154}
155
156/***************************************************************
157** Build a dictionary from scratch.
158*/
159#ifndef PF_NO_INIT
160PForthDictionary pfBuildDictionary( cell_t HeaderSize, cell_t CodeSize )
161{
162 pfDictionary_t *dic;
163
164 dic = pfCreateDictionary( HeaderSize, CodeSize );
165 if( !dic ) goto nomem;
166
167 pfDebugMessage("pfBuildDictionary: Start adding dictionary entries.\n");
168
169 gCurrentDictionary = dic;
170 gNumPrimitives = NUM_PRIMITIVES;
171
172 CreateDicEntryC( ID_EXIT, "EXIT", 0 );
173 pfDebugMessage("pfBuildDictionary: added EXIT\n");
174 CreateDicEntryC( ID_1MINUS, "1-", 0 );
175 pfDebugMessage("pfBuildDictionary: added 1-\n");
176 CreateDicEntryC( ID_1PLUS, "1+", 0 );
177 CreateDicEntryC( ID_2_R_FETCH, "2R@", 0 );
178 CreateDicEntryC( ID_2_R_FROM, "2R>", 0 );
179 CreateDicEntryC( ID_2_TO_R, "2>R", 0 );
180 CreateDicEntryC( ID_2DUP, "2DUP", 0 );
181 CreateDicEntryC( ID_2LITERAL, "2LITERAL", FLAG_IMMEDIATE );
182 CreateDicEntryC( ID_2LITERAL_P, "(2LITERAL)", 0 );
183 CreateDicEntryC( ID_2MINUS, "2-", 0 );
184 CreateDicEntryC( ID_2PLUS, "2+", 0 );
185 CreateDicEntryC( ID_2OVER, "2OVER", 0 );
186 CreateDicEntryC( ID_2SWAP, "2SWAP", 0 );
187 CreateDicEntryC( ID_ACCEPT_P, "(ACCEPT)", 0 );
188 CreateDeferredC( ID_ACCEPT_P, "ACCEPT" );
189 CreateDicEntryC( ID_ALITERAL, "ALITERAL", FLAG_IMMEDIATE );
190 CreateDicEntryC( ID_ALITERAL_P, "(ALITERAL)", 0 );
191 CreateDicEntryC( ID_ALLOCATE, "ALLOCATE", 0 );
192 pfDebugMessage("pfBuildDictionary: added ALLOCATE\n");
193 CreateDicEntryC( ID_ARSHIFT, "ARSHIFT", 0 );
194 CreateDicEntryC( ID_AND, "AND", 0 );
195 CreateDicEntryC( ID_BAIL, "BAIL", 0 );
196 CreateDicEntryC( ID_BRANCH, "BRANCH", 0 );
197 CreateDicEntryC( ID_BODY_OFFSET, "BODY_OFFSET", 0 );
198 CreateDicEntryC( ID_BYE, "BYE", 0 );
199 CreateDicEntryC( ID_CATCH, "CATCH", 0 );
200 CreateDicEntryC( ID_CELL, "CELL", 0 );
201 CreateDicEntryC( ID_CELLS, "CELLS", 0 );
202 CreateDicEntryC( ID_CFETCH, "C@", 0 );
203 CreateDicEntryC( ID_CMOVE, "CMOVE", 0 );
204 CreateDicEntryC( ID_CMOVE_UP, "CMOVE>", 0 );
205 CreateDicEntryC( ID_COLON, ":", 0 );
206 CreateDicEntryC( ID_COLON_P, "(:)", 0 );
207 CreateDicEntryC( ID_COMPARE, "COMPARE", 0 );
208 CreateDicEntryC( ID_COMP_EQUAL, "=", 0 );
209 CreateDicEntryC( ID_COMP_NOT_EQUAL, "<>", 0 );
210 CreateDicEntryC( ID_COMP_GREATERTHAN, ">", 0 );
211 CreateDicEntryC( ID_COMP_U_GREATERTHAN, "U>", 0 );
212 pfDebugMessage("pfBuildDictionary: added U>\n");
213 CreateDicEntryC( ID_COMP_LESSTHAN, "<", 0 );
214 CreateDicEntryC( ID_COMP_U_LESSTHAN, "U<", 0 );
215 CreateDicEntryC( ID_COMP_ZERO_EQUAL, "0=", 0 );
216 CreateDicEntryC( ID_COMP_ZERO_NOT_EQUAL, "0<>", 0 );
217 CreateDicEntryC( ID_COMP_ZERO_GREATERTHAN, "0>", 0 );
218 CreateDicEntryC( ID_COMP_ZERO_LESSTHAN, "0<", 0 );
219 CreateDicEntryC( ID_CR, "CR", 0 );
220 CreateDicEntryC( ID_CREATE, "CREATE", 0 );
221 CreateDicEntryC( ID_CREATE_P, "(CREATE)", 0 );
222 CreateDicEntryC( ID_D_PLUS, "D+", 0 );
223 CreateDicEntryC( ID_D_MINUS, "D-", 0 );
224 CreateDicEntryC( ID_D_UMSMOD, "UM/MOD", 0 );
225 CreateDicEntryC( ID_D_MUSMOD, "MU/MOD", 0 );
226 CreateDicEntryC( ID_D_MTIMES, "M*", 0 );
227 pfDebugMessage("pfBuildDictionary: added M*\n");
228 CreateDicEntryC( ID_D_UMTIMES, "UM*", 0 );
229 CreateDicEntryC( ID_DEFER, "DEFER", 0 );
230 CreateDicEntryC( ID_CSTORE, "C!", 0 );
231 CreateDicEntryC( ID_DEPTH, "DEPTH", 0 );
232 pfDebugMessage("pfBuildDictionary: added DEPTH\n");
233 CreateDicEntryC( ID_DIVIDE, "/", 0 );
234 CreateDicEntryC( ID_DOT, ".", 0 );
235 CreateDicEntryC( ID_DOTS, ".S", 0 );
236 pfDebugMessage("pfBuildDictionary: added .S\n");
237 CreateDicEntryC( ID_DO_P, "(DO)", 0 );
238 CreateDicEntryC( ID_DROP, "DROP", 0 );
239 CreateDicEntryC( ID_DUMP, "DUMP", 0 );
240 CreateDicEntryC( ID_DUP, "DUP", 0 );
241 CreateDicEntryC( ID_EMIT_P, "(EMIT)", 0 );
242 pfDebugMessage("pfBuildDictionary: added (EMIT)\n");
243 CreateDeferredC( ID_EMIT_P, "EMIT");
244 pfDebugMessage("pfBuildDictionary: added EMIT\n");
245 CreateDicEntryC( ID_EOL, "EOL", 0 );
246 CreateDicEntryC( ID_ERRORQ_P, "(?ERROR)", 0 );
247 CreateDicEntryC( ID_ERRORQ_P, "?ERROR", 0 );
248 CreateDicEntryC( ID_EXECUTE, "EXECUTE", 0 );
249 CreateDicEntryC( ID_FETCH, "@", 0 );
250 CreateDicEntryC( ID_FILL, "FILL", 0 );
251 CreateDicEntryC( ID_FIND, "FIND", 0 );
252 CreateDicEntryC( ID_FILE_CREATE, "CREATE-FILE", 0 );
253 CreateDicEntryC( ID_FILE_DELETE, "DELETE-FILE", 0 );
254 CreateDicEntryC( ID_FILE_OPEN, "OPEN-FILE", 0 );
255 CreateDicEntryC( ID_FILE_CLOSE, "CLOSE-FILE", 0 );
256 CreateDicEntryC( ID_FILE_READ, "READ-FILE", 0 );
257 CreateDicEntryC( ID_FILE_SIZE, "FILE-SIZE", 0 );
258 CreateDicEntryC( ID_FILE_WRITE, "WRITE-FILE", 0 );
259 CreateDicEntryC( ID_FILE_POSITION, "FILE-POSITION", 0 );
260 CreateDicEntryC( ID_FILE_REPOSITION, "REPOSITION-FILE", 0 );
261 CreateDicEntryC( ID_FILE_RO, "R/O", 0 );
262 CreateDicEntryC( ID_FILE_RW, "R/W", 0 );
263 CreateDicEntryC( ID_FILE_WO, "W/O", 0 );
264 CreateDicEntryC( ID_FILE_BIN, "BIN", 0 );
265 CreateDicEntryC( ID_FINDNFA, "FINDNFA", 0 );
266 CreateDicEntryC( ID_FLUSHEMIT, "FLUSHEMIT", 0 );
267 CreateDicEntryC( ID_FREE, "FREE", 0 );
268#include "pfcompfp.h"
269 CreateDicEntryC( ID_HERE, "HERE", 0 );
270 CreateDicEntryC( ID_NUMBERQ_P, "(SNUMBER?)", 0 );
271 CreateDicEntryC( ID_I, "I", 0 );
272 CreateDicEntryC( ID_INTERPRET, "INTERPRET", 0 );
273 CreateDicEntryC( ID_J, "J", 0 );
274 CreateDicEntryC( ID_INCLUDE_FILE, "INCLUDE-FILE", 0 );
275 CreateDicEntryC( ID_KEY, "KEY", 0 );
276 CreateDicEntryC( ID_LEAVE_P, "(LEAVE)", 0 );
277 CreateDicEntryC( ID_LITERAL, "LITERAL", FLAG_IMMEDIATE );
278 CreateDicEntryC( ID_LITERAL_P, "(LITERAL)", 0 );
279 CreateDicEntryC( ID_LOADSYS, "LOADSYS", 0 );
280 CreateDicEntryC( ID_LOCAL_COMPILER, "LOCAL-COMPILER", 0 );
281 CreateDicEntryC( ID_LOCAL_ENTRY, "(LOCAL.ENTRY)", 0 );
282 CreateDicEntryC( ID_LOCAL_EXIT, "(LOCAL.EXIT)", 0 );
283 CreateDicEntryC( ID_LOCAL_FETCH, "(LOCAL@)", 0 );
284 CreateDicEntryC( ID_LOCAL_FETCH_1, "(1_LOCAL@)", 0 );
285 CreateDicEntryC( ID_LOCAL_FETCH_2, "(2_LOCAL@)", 0 );
286 CreateDicEntryC( ID_LOCAL_FETCH_3, "(3_LOCAL@)", 0 );
287 CreateDicEntryC( ID_LOCAL_FETCH_4, "(4_LOCAL@)", 0 );
288 CreateDicEntryC( ID_LOCAL_FETCH_5, "(5_LOCAL@)", 0 );
289 CreateDicEntryC( ID_LOCAL_FETCH_6, "(6_LOCAL@)", 0 );
290 CreateDicEntryC( ID_LOCAL_FETCH_7, "(7_LOCAL@)", 0 );
291 CreateDicEntryC( ID_LOCAL_FETCH_8, "(8_LOCAL@)", 0 );
292 CreateDicEntryC( ID_LOCAL_STORE, "(LOCAL!)", 0 );
293 CreateDicEntryC( ID_LOCAL_STORE_1, "(1_LOCAL!)", 0 );
294 CreateDicEntryC( ID_LOCAL_STORE_2, "(2_LOCAL!)", 0 );
295 CreateDicEntryC( ID_LOCAL_STORE_3, "(3_LOCAL!)", 0 );
296 CreateDicEntryC( ID_LOCAL_STORE_4, "(4_LOCAL!)", 0 );
297 CreateDicEntryC( ID_LOCAL_STORE_5, "(5_LOCAL!)", 0 );
298 CreateDicEntryC( ID_LOCAL_STORE_6, "(6_LOCAL!)", 0 );
299 CreateDicEntryC( ID_LOCAL_STORE_7, "(7_LOCAL!)", 0 );
300 CreateDicEntryC( ID_LOCAL_STORE_8, "(8_LOCAL!)", 0 );
301 CreateDicEntryC( ID_LOCAL_PLUSSTORE, "(LOCAL+!)", 0 );
302 CreateDicEntryC( ID_LOOP_P, "(LOOP)", 0 );
303 CreateDicEntryC( ID_LSHIFT, "LSHIFT", 0 );
304 CreateDicEntryC( ID_MAX, "MAX", 0 );
305 CreateDicEntryC( ID_MIN, "MIN", 0 );
306 CreateDicEntryC( ID_MINUS, "-", 0 );
307 CreateDicEntryC( ID_NAME_TO_TOKEN, "NAME>", 0 );
308 CreateDicEntryC( ID_NAME_TO_PREVIOUS, "PREVNAME", 0 );
309 CreateDicEntryC( ID_NOOP, "NOOP", 0 );
310 CreateDeferredC( ID_NUMBERQ_P, "NUMBER?" );
311 CreateDicEntryC( ID_OR, "OR", 0 );
312 CreateDicEntryC( ID_OVER, "OVER", 0 );
313 pfDebugMessage("pfBuildDictionary: added OVER\n");
314 CreateDicEntryC( ID_PICK, "PICK", 0 );
315 CreateDicEntryC( ID_PLUS, "+", 0 );
316 CreateDicEntryC( ID_PLUSLOOP_P, "(+LOOP)", 0 );
317 CreateDicEntryC( ID_PLUS_STORE, "+!", 0 );
318 CreateDicEntryC( ID_QUIT_P, "(QUIT)", 0 );
319 CreateDeferredC( ID_QUIT_P, "QUIT" );
320 CreateDicEntryC( ID_QDO_P, "(?DO)", 0 );
321 CreateDicEntryC( ID_QDUP, "?DUP", 0 );
322 CreateDicEntryC( ID_QTERMINAL, "?TERMINAL", 0 );
323 CreateDicEntryC( ID_QTERMINAL, "KEY?", 0 );
324 CreateDicEntryC( ID_REFILL, "REFILL", 0 );
325 CreateDicEntryC( ID_RESIZE, "RESIZE", 0 );
326 CreateDicEntryC( ID_ROLL, "ROLL", 0 );
327 CreateDicEntryC( ID_ROT, "ROT", 0 );
328 CreateDicEntryC( ID_RSHIFT, "RSHIFT", 0 );
329 CreateDicEntryC( ID_R_DROP, "RDROP", 0 );
330 CreateDicEntryC( ID_R_FETCH, "R@", 0 );
331 CreateDicEntryC( ID_R_FROM, "R>", 0 );
332 CreateDicEntryC( ID_RP_FETCH, "RP@", 0 );
333 CreateDicEntryC( ID_RP_STORE, "RP!", 0 );
334 CreateDicEntryC( ID_SEMICOLON, ";", FLAG_IMMEDIATE );
335 CreateDicEntryC( ID_SP_FETCH, "SP@", 0 );
336 CreateDicEntryC( ID_SP_STORE, "SP!", 0 );
337 CreateDicEntryC( ID_STORE, "!", 0 );
338 CreateDicEntryC( ID_SAVE_FORTH_P, "(SAVE-FORTH)", 0 );
339 CreateDicEntryC( ID_SCAN, "SCAN", 0 );
340 CreateDicEntryC( ID_SKIP, "SKIP", 0 );
341 CreateDicEntryC( ID_SOURCE, "SOURCE", 0 );
342 CreateDicEntryC( ID_SOURCE_SET, "SET-SOURCE", 0 );
343 CreateDicEntryC( ID_SOURCE_ID, "SOURCE-ID", 0 );
344 CreateDicEntryC( ID_SOURCE_ID_PUSH, "PUSH-SOURCE-ID", 0 );
345 CreateDicEntryC( ID_SOURCE_ID_POP, "POP-SOURCE-ID", 0 );
08689895
HE		 346 CreateDicEntryC( ID_SOURCE_LINE_NUMBER_FETCH, "SOURCE-LINE-NUMBER@", 0 );
347 CreateDicEntryC( ID_SOURCE_LINE_NUMBER_STORE, "SOURCE-LINE-NUMBER!", 0 );
8e9db35f
PB		 348 CreateDicEntryC( ID_SWAP, "SWAP", 0 );
349 CreateDicEntryC( ID_TEST1, "TEST1", 0 );
350 CreateDicEntryC( ID_TEST2, "TEST2", 0 );
351 CreateDicEntryC( ID_TICK, "'", 0 );
352 CreateDicEntryC( ID_TIMES, "*", 0 );
353 CreateDicEntryC( ID_THROW, "THROW", 0 );
354 CreateDicEntryC( ID_TO_R, ">R", 0 );
355 CreateDicEntryC( ID_TYPE, "TYPE", 0 );
356 CreateDicEntryC( ID_VAR_BASE, "BASE", 0 );
357 CreateDicEntryC( ID_VAR_CODE_BASE, "CODE-BASE", 0 );
358 CreateDicEntryC( ID_VAR_CODE_LIMIT, "CODE-LIMIT", 0 );
359 CreateDicEntryC( ID_VAR_CONTEXT, "CONTEXT", 0 );
360 CreateDicEntryC( ID_VAR_DP, "DP", 0 );
361 CreateDicEntryC( ID_VAR_ECHO, "ECHO", 0 );
362 CreateDicEntryC( ID_VAR_HEADERS_PTR, "HEADERS-PTR", 0 );
363 CreateDicEntryC( ID_VAR_HEADERS_BASE, "HEADERS-BASE", 0 );
364 CreateDicEntryC( ID_VAR_HEADERS_LIMIT, "HEADERS-LIMIT", 0 );
365 CreateDicEntryC( ID_VAR_NUM_TIB, "#TIB", 0 );
366 CreateDicEntryC( ID_VAR_RETURN_CODE, "RETURN-CODE", 0 );
367 CreateDicEntryC( ID_VAR_TRACE_FLAGS, "TRACE-FLAGS", 0 );
368 CreateDicEntryC( ID_VAR_TRACE_LEVEL, "TRACE-LEVEL", 0 );
369 CreateDicEntryC( ID_VAR_TRACE_STACK, "TRACE-STACK", 0 );
370 CreateDicEntryC( ID_VAR_OUT, "OUT", 0 );
371 CreateDicEntryC( ID_VAR_STATE, "STATE", 0 );
372 CreateDicEntryC( ID_VAR_TO_IN, ">IN", 0 );
373 CreateDicEntryC( ID_WORD, "WORD", 0 );
374 CreateDicEntryC( ID_WORD_FETCH, "W@", 0 );
375 CreateDicEntryC( ID_WORD_STORE, "W!", 0 );
376 CreateDicEntryC( ID_XOR, "XOR", 0 );
377 CreateDicEntryC( ID_ZERO_BRANCH, "0BRANCH", 0 );
378
379 pfDebugMessage("pfBuildDictionary: FindSpecialXTs\n");
380 if( FindSpecialXTs() < 0 ) goto error;
381
382 if( CompileCustomFunctions() < 0 ) goto error; /* Call custom 'C' call builder. */
383
384#ifdef PF_DEBUG
385 DumpMemory( dic->dic_HeaderBase, 256 );
386 DumpMemory( dic->dic_CodeBase, 256 );
387#endif
388
389 pfDebugMessage("pfBuildDictionary: Finished adding dictionary entries.\n");
390 return (PForthDictionary) dic;
391
392error:
393 pfDebugMessage("pfBuildDictionary: Error adding dictionary entries.\n");
394 pfDeleteDictionary( dic );
395 return NULL;
396
397nomem:
398 return NULL;
399}
400#endif /* !PF_NO_INIT */
401
402/*
403** ( xt -- nfa 1 , x 0 , find NFA in dictionary from XT )
404** 1 for IMMEDIATE values
405*/
406cell_t ffTokenToName( ExecToken XT, const ForthString **NFAPtr )
407{
408 const ForthString *NameField;
409 cell_t Searching = TRUE;
410 cell_t Result = 0;
411 ExecToken TempXT;
412
413 NameField = (ForthString *) gVarContext;
414DBUGX(("\ffCodeToName: gVarContext = 0x%x\n", gVarContext));
415
416 do
417 {
418 TempXT = NameToToken( NameField );
419
420 if( TempXT == XT )
421 {
422DBUGX(("ffCodeToName: NFA = 0x%x\n", NameField));
423 *NFAPtr = NameField ;
424 Result = 1;
425 Searching = FALSE;
426 }
427 else
428 {
429 NameField = NameToPrevious( NameField );
430 if( NameField == NULL )
431 {
432 *NFAPtr = 0;
433 Searching = FALSE;
434 }
435 }
436 } while ( Searching);
437
438 return Result;
439}
440
441/*
442** ( $name -- $addr 0 | nfa -1 | nfa 1 , find NFA in dictionary )
443** 1 for IMMEDIATE values
444*/
445cell_t ffFindNFA( const ForthString *WordName, const ForthString **NFAPtr )
446{
447 const ForthString *WordChar;
448 uint8_t WordLen;
449 const char *NameField, *NameChar;
450 int8_t NameLen;
451 cell_t Searching = TRUE;
452 cell_t Result = 0;
453
454 WordLen = (uint8_t) ((ucell_t)*WordName & 0x1F);
455 WordChar = WordName+1;
456
457 NameField = (ForthString *) gVarContext;
458DBUG(("\nffFindNFA: WordLen = %d, WordName = %*s\n", WordLen, WordLen, WordChar ));
459DBUG(("\nffFindNFA: gVarContext = 0x%x\n", gVarContext));
460 do
461 {
462 NameLen = (uint8_t) ((ucell_t)(*NameField) & MASK_NAME_SIZE);
463 NameChar = NameField+1;
464/* DBUG((" %c\n", (*NameField & FLAG_SMUDGE) ? 'S' : 'V' )); */
465 if( ((*NameField & FLAG_SMUDGE) == 0) &&
466 (NameLen == WordLen) &&
467 ffCompareTextCaseN( NameChar, WordChar, WordLen ) ) /* FIXME - slow */
468 {
469DBUG(("ffFindNFA: found it at NFA = 0x%x\n", NameField));
470 *NFAPtr = NameField ;
471 Result = ((*NameField) & FLAG_IMMEDIATE) ? 1 : -1;
472 Searching = FALSE;
473 }
474 else
475 {
476 NameField = NameToPrevious( NameField );
477 if( NameField == NULL )
478 {
479 *NFAPtr = WordName;
480 Searching = FALSE;
481 }
482 }
483 } while ( Searching);
484DBUG(("ffFindNFA: returns 0x%x\n", Result));
485 return Result;
486}
487
488
489/***************************************************************
490** ( $name -- $name 0 | xt -1 | xt 1 )
491** 1 for IMMEDIATE values
492*/
493cell_t ffFind( const ForthString *WordName, ExecToken *pXT )
494{
495 const ForthString *NFA;
496 cell_t Result;
497
498 Result = ffFindNFA( WordName, &NFA );
499DBUG(("ffFind: %8s at 0x%x\n", WordName+1, NFA)); /* WARNING, not NUL terminated. %Q */
500 if( Result )
501 {
502 *pXT = NameToToken( NFA );
503 }
504 else
505 {
506 *pXT = (ExecToken) WordName;
507 }
508
509 return Result;
510}
511
512/****************************************************************
513** Find name when passed 'C' string.
514*/
515cell_t ffFindC( const char *WordName, ExecToken *pXT )
516{
517DBUG(("ffFindC: %s\n", WordName ));
518 CStringToForth( gScratch, WordName, sizeof(gScratch) );
519 return ffFind( gScratch, pXT );
520}
521
522
523/***********************************************************/
524/********* Compiling New Words *****************************/
525/***********************************************************/
526#define DIC_SAFETY_MARGIN (400)
527
528/*************************************************************
529** Check for dictionary overflow.
530*/
531static cell_t ffCheckDicRoom( void )
532{
533 cell_t RoomLeft;
534 RoomLeft = (char *)gCurrentDictionary->dic_HeaderLimit -
535 (char *)gCurrentDictionary->dic_HeaderPtr;
536 if( RoomLeft < DIC_SAFETY_MARGIN )
537 {
538 pfReportError("ffCheckDicRoom", PF_ERR_HEADER_ROOM);
539 return PF_ERR_HEADER_ROOM;
540 }
541
542 RoomLeft = (char *)gCurrentDictionary->dic_CodeLimit -
543 (char *)gCurrentDictionary->dic_CodePtr.Byte;
544 if( RoomLeft < DIC_SAFETY_MARGIN )
545 {
546 pfReportError("ffCheckDicRoom", PF_ERR_CODE_ROOM);
547 return PF_ERR_CODE_ROOM;
548 }
549 return 0;
550}
551
552/*************************************************************
553** Create a dictionary entry given a string name.
554*/
555void ffCreateSecondaryHeader( const ForthStringPtr FName)
556{
557 pfDebugMessage("ffCreateSecondaryHeader()\n");
558/* Check for dictionary overflow. */
559 if( ffCheckDicRoom() ) return;
560
561 pfDebugMessage("ffCreateSecondaryHeader: CheckRedefinition()\n");
562 CheckRedefinition( FName );
563/* Align CODE_HERE */
564 CODE_HERE = (cell_t *)( (((ucell_t)CODE_HERE) + UINT32_MASK) & ~UINT32_MASK);
565 CreateDicEntry( (ExecToken) ABS_TO_CODEREL(CODE_HERE), FName, FLAG_SMUDGE );
566}
567
568/*************************************************************
569** Begin compiling a secondary word.
570*/
571static void ffStringColon( const ForthStringPtr FName)
572{
573 ffCreateSecondaryHeader( FName );
574 gVarState = 1;
575}
576
577/*************************************************************
578** Read the next ExecToken from the Source and create a word.
579*/
580void ffColon( void )
581{
582 char *FName;
583
584 gDepthAtColon = DATA_STACK_DEPTH;
585
586 FName = ffWord( BLANK );
587 if( *FName > 0 )
588 {
589 ffStringColon( FName );
590 }
591}
592
593/*************************************************************
594** Check to see if name is already in dictionary.
595*/
596static cell_t CheckRedefinition( const ForthStringPtr FName )
597{
598 cell_t flag;
599 ExecToken XT;
600
601 flag = ffFind( FName, &XT);
602 if ( flag && !gVarQuiet)
603 {
604 ioType( FName+1, (cell_t) *FName );
605 MSG( " redefined.\n" ); /* FIXME - allow user to run off this warning. */
606 }
607 return flag;
608}
609
610void ffStringCreate( char *FName)
611{
612 ffCreateSecondaryHeader( FName );
613
614 CODE_COMMA( ID_CREATE_P );
615 CODE_COMMA( ID_EXIT );
616 ffFinishSecondary();
617
618}
619
620/* Read the next ExecToken from the Source and create a word. */
621void ffCreate( void )
622{
623 char *FName;
624
625 FName = ffWord( BLANK );
626 if( *FName > 0 )
627 {
628 ffStringCreate( FName );
629 }
630}
631
632void ffStringDefer( const ForthStringPtr FName, ExecToken DefaultXT )
633{
634 pfDebugMessage("ffStringDefer()\n");
635 ffCreateSecondaryHeader( FName );
636
637 CODE_COMMA( ID_DEFER_P );
638 CODE_COMMA( DefaultXT );
639
640 ffFinishSecondary();
641
642}
643#ifndef PF_NO_INIT
644/* Convert name then create deferred dictionary entry. */
645static void CreateDeferredC( ExecToken DefaultXT, const char *CName )
646{
647 char FName[40];
648 CStringToForth( FName, CName, sizeof(FName) );
649 ffStringDefer( FName, DefaultXT );
650}
651#endif
652
653/* Read the next token from the Source and create a word. */
654void ffDefer( void )
655{
656 char *FName;
657
658 FName = ffWord( BLANK );
659 if( *FName > 0 )
660 {
661 ffStringDefer( FName, ID_QUIT_P );
662 }
663}
664
665/* Unsmudge the word to make it visible. */
fb2f857a 666static void ffUnSmudge( void )
8e9db35f
PB		 667{
668 *(char*)gVarContext &= ~FLAG_SMUDGE;
669}
670
671/* Implement ; */
672ThrowCode ffSemiColon( void )
673{
674 ThrowCode exception = 0;
675 gVarState = 0;
676
677 if( (gDepthAtColon != DATA_STACK_DEPTH) &&
678 (gDepthAtColon != DEPTH_AT_COLON_INVALID) ) /* Ignore if no ':' */
679 {
680 exception = THROW_SEMICOLON;
681 }
682 else
683 {
684 ffFinishSecondary();
685 }
686 gDepthAtColon = DEPTH_AT_COLON_INVALID;
687 return exception;
688}
689
690/* Finish the definition of a Forth word. */
691void ffFinishSecondary( void )
692{
693 CODE_COMMA( ID_EXIT );
694 ffUnSmudge();
695}
696
697/**************************************************************/
698/* Used to pull a number from the dictionary to the stack */
699void ff2Literal( cell_t dHi, cell_t dLo )
700{
701 CODE_COMMA( ID_2LITERAL_P );
702 CODE_COMMA( dHi );
703 CODE_COMMA( dLo );
704}
705void ffALiteral( cell_t Num )
706{
707 CODE_COMMA( ID_ALITERAL_P );
708 CODE_COMMA( Num );
709}
710void ffLiteral( cell_t Num )
711{
712 CODE_COMMA( ID_LITERAL_P );
713 CODE_COMMA( Num );
714}
715
716#ifdef PF_SUPPORT_FP
717void ffFPLiteral( PF_FLOAT fnum )
718{
719 /* Hack for Metrowerks complier which won't compile the
720 * original expression.
721 */
722 PF_FLOAT *temp;
723 cell_t *dicPtr;
724
725/* Make sure that literal float data is float aligned. */
726 dicPtr = CODE_HERE + 1;
727 while( (((ucell_t) dicPtr++) & (sizeof(PF_FLOAT) - 1)) != 0)
728 {
729 DBUG((" comma NOOP to align FPLiteral\n"));
730 CODE_COMMA( ID_NOOP );
731 }
732 CODE_COMMA( ID_FP_FLITERAL_P );
733
734 temp = (PF_FLOAT *)CODE_HERE;
735 WRITE_FLOAT_DIC(temp,fnum); /* Write to dictionary. */
736 temp++;
737 CODE_HERE = (cell_t *) temp;
738}
739#endif /* PF_SUPPORT_FP */
740
741/**************************************************************/
fb2f857a 742static ThrowCode FindAndCompile( const char *theWord )
8e9db35f
PB		 743{
744 cell_t Flag;
745 ExecToken XT;
746 cell_t Num;
747 ThrowCode exception = 0;
748
749 Flag = ffFind( theWord, &XT);
750DBUG(("FindAndCompile: theWord = %8s, XT = 0x%x, Flag = %d\n", theWord, XT, Flag ));
751
752/* Is it a normal word ? */
753 if( Flag == -1 )
754 {
755 if( gVarState ) /* compiling? */
756 {
757 CODE_COMMA( XT );
758 }
759 else
760 {
761 exception = pfCatch( XT );
762 }
763 }
764 else if ( Flag == 1 ) /* or is it IMMEDIATE ? */
765 {
766DBUG(("FindAndCompile: IMMEDIATE, theWord = 0x%x\n", theWord ));
767 exception = pfCatch( XT );
768 }
769 else /* try to interpret it as a number. */
770 {
771/* Call deferred NUMBER? */
772 cell_t NumResult;
773
774DBUG(("FindAndCompile: not found, try number?\n" ));
775 PUSH_DATA_STACK( theWord ); /* Push text of number */
776 exception = pfCatch( gNumberQ_XT );
777 if( exception ) goto error;
778
779DBUG(("FindAndCompile: after number?\n" ));
780 NumResult = POP_DATA_STACK; /* Success? */
781 switch( NumResult )
782 {
783 case NUM_TYPE_SINGLE:
784 if( gVarState ) /* compiling? */
785 {
786 Num = POP_DATA_STACK;
787 ffLiteral( Num );
788 }
789 break;
790
791 case NUM_TYPE_DOUBLE:
792 if( gVarState ) /* compiling? */
793 {
794 Num = POP_DATA_STACK; /* get hi portion */
795 ff2Literal( Num, POP_DATA_STACK );
796 }
797 break;
798
799#ifdef PF_SUPPORT_FP
800 case NUM_TYPE_FLOAT:
801 if( gVarState ) /* compiling? */
802 {
803 ffFPLiteral( *gCurrentTask->td_FloatStackPtr++ );
804 }
805 break;
806#endif
807
808 case NUM_TYPE_BAD:
809 default:
810 ioType( theWord+1, *theWord );
811 MSG( " ? - unrecognized word!\n" );
812 exception = THROW_UNDEFINED_WORD;
813 break;
814
815 }
816 }
817error:
818 return exception;
819}
820
821/**************************************************************
822** Forth outer interpreter. Parses words from Source.
823** Executes them or compiles them based on STATE.
824*/
825ThrowCode ffInterpret( void )
826{
827 cell_t flag;
828 char *theWord;
829 ThrowCode exception = 0;
830
831/* Is there any text left in Source ? */
832 while( gCurrentTask->td_IN < (gCurrentTask->td_SourceNum) )
833 {
834
835 pfDebugMessage("ffInterpret: calling ffWord(()\n");
f7548536 836 theWord = ffLWord( BLANK );
8e9db35f
PB		 837 DBUG(("ffInterpret: theWord = 0x%x, Len = %d\n", theWord, *theWord ));
838
839 if( *theWord > 0 )
840 {
841 flag = 0;
842 if( gLocalCompiler_XT )
843 {
844 PUSH_DATA_STACK( theWord ); /* Push word. */
845 exception = pfCatch( gLocalCompiler_XT );
846 if( exception ) goto error;
847 flag = POP_DATA_STACK; /* Compiled local? */
848 }
849 if( flag == 0 )
850 {
851 exception = FindAndCompile( theWord );
852 if( exception ) goto error;
853 }
854 }
855
856 DBUG(("ffInterpret: IN=%d, SourceNum=%d\n", gCurrentTask->td_IN,
857 gCurrentTask->td_SourceNum ) );
858 }
859error:
860 return exception;
861}
862
863/**************************************************************/
864ThrowCode ffOK( void )
865{
866 cell_t exception = 0;
867/* Check for stack underflow. %Q what about overflows? */
868 if( (gCurrentTask->td_StackBase - gCurrentTask->td_StackPtr) < 0 )
869 {
870 exception = THROW_STACK_UNDERFLOW;
871 }
872#ifdef PF_SUPPORT_FP /* Check floating point stack too! */
873 else if((gCurrentTask->td_FloatStackBase - gCurrentTask->td_FloatStackPtr) < 0)
874 {
875 exception = THROW_FLOAT_STACK_UNDERFLOW;
876 }
877#endif
878 else if( gCurrentTask->td_InputStream == PF_STDIN)
879 {
880 if( !gVarState ) /* executing? */
881 {
882 if( !gVarQuiet )
883 {
884 MSG( " ok\n" );
885 if(gVarTraceStack) ffDotS();
886 }
887 else
888 {
889 EMIT_CR;
890 }
891 }
892 }
893 return exception;
894}
895
896/***************************************************************
897** Cleanup Include stack by popping and closing files.
898***************************************************************/
899void pfHandleIncludeError( void )
900{
901 FileStream *cur;
902
903 while( (cur = ffPopInputStream()) != PF_STDIN)
904 {
905 DBUG(("ffCleanIncludeStack: closing 0x%x\n", cur ));
906 sdCloseFile(cur);
907 }
908}
909
910/***************************************************************
911** Interpret input in a loop.
912***************************************************************/
913ThrowCode ffOuterInterpreterLoop( void )
914{
915 cell_t exception = 0;
916 do
917 {
918 exception = ffRefill();
919 if(exception <= 0) break;
920
921 exception = ffInterpret();
922 if( exception == 0 )
923 {
924 exception = ffOK();
925 }
926
927 } while( exception == 0 );
928 return exception;
929}
930
931/***************************************************************
932** Include then close a file
933***************************************************************/
934
935ThrowCode ffIncludeFile( FileStream *InputFile )
936{
937 ThrowCode exception;
938
939/* Push file stream. */
940 exception = ffPushInputStream( InputFile );
941 if( exception < 0 ) return exception;
942
943/* Run outer interpreter for stream. */
944 exception = ffOuterInterpreterLoop();
945 if( exception )
946 {
947 int i;
948/* Report line number and nesting level. */
949 MSG("INCLUDE error on line #"); ffDot(gCurrentTask->td_LineNumber);
950 MSG(", level = "); ffDot(gIncludeIndex );
951 EMIT_CR
952
953/* Dump line of error and show offset in line for >IN */
954 for( i=0; i<gCurrentTask->td_SourceNum; i++ )
955 {
956 char c = gCurrentTask->td_SourcePtr[i];
957 if( c == '\t' ) c = ' ';
958 EMIT(c);
959 }
960 EMIT_CR;
961 for( i=0; i<(gCurrentTask->td_IN - 1); i++ ) EMIT('^');
962 EMIT_CR;
963 }
964
965/* Pop file stream. */
966 ffPopInputStream();
967
968/* ANSI spec specifies that this should also close the file. */
969 sdCloseFile(InputFile);
970
971 return exception;
972}
973
974#endif /* !PF_NO_SHELL */
975
976/***************************************************************
977** Save current input stream on stack, use this new one.
978***************************************************************/
979Err ffPushInputStream( FileStream *InputFile )
980{
981 cell_t Result = 0;
982 IncludeFrame *inf;
983
984/* Push current input state onto special include stack. */
985 if( gIncludeIndex < MAX_INCLUDE_DEPTH )
986 {
987 inf = &gIncludeStack[gIncludeIndex++];
988 inf->inf_FileID = gCurrentTask->td_InputStream;
989 inf->inf_IN = gCurrentTask->td_IN;
990 inf->inf_LineNumber = gCurrentTask->td_LineNumber;
991 inf->inf_SourceNum = gCurrentTask->td_SourceNum;
992/* Copy TIB plus any NUL terminator into saved area. */
993 if( (inf->inf_SourceNum > 0) && (inf->inf_SourceNum < (TIB_SIZE-1)) )
994 {
995 pfCopyMemory( inf->inf_SaveTIB, gCurrentTask->td_TIB, inf->inf_SourceNum+1 );
996 }
997
998/* Set new current input. */
999 DBUG(( "ffPushInputStream: InputFile = 0x%x\n", InputFile ));
1000 gCurrentTask->td_InputStream = InputFile;
1001 gCurrentTask->td_LineNumber = 0;
1002 }
1003 else
1004 {
1005 ERR("ffPushInputStream: max depth exceeded.\n");
1006 return -1;
1007 }
1008
1009
1010 return Result;
1011}
1012
1013/***************************************************************
1014** Go back to reading previous stream.
1015** Just return gCurrentTask->td_InputStream upon underflow.
1016***************************************************************/
1017FileStream *ffPopInputStream( void )
1018{
1019 IncludeFrame *inf;
1020 FileStream *Result;
1021
1022DBUG(("ffPopInputStream: gIncludeIndex = %d\n", gIncludeIndex));
1023 Result = gCurrentTask->td_InputStream;
1024
1025/* Restore input state. */
1026 if( gIncludeIndex > 0 )
1027 {
1028 inf = &gIncludeStack[--gIncludeIndex];
1029 gCurrentTask->td_InputStream = inf->inf_FileID;
1030 DBUG(("ffPopInputStream: stream = 0x%x\n", gCurrentTask->td_InputStream ));
1031 gCurrentTask->td_IN = inf->inf_IN;
1032 gCurrentTask->td_LineNumber = inf->inf_LineNumber;
1033 gCurrentTask->td_SourceNum = inf->inf_SourceNum;
1034/* Copy TIB plus any NUL terminator into saved area. */
1035 if( (inf->inf_SourceNum > 0) && (inf->inf_SourceNum < (TIB_SIZE-1)) )
1036 {
1037 pfCopyMemory( gCurrentTask->td_TIB, inf->inf_SaveTIB, inf->inf_SourceNum+1 );
1038 }
1039
1040 }
1041DBUG(("ffPopInputStream: return = 0x%x\n", Result ));
1042
1043 return Result;
1044}
1045
1046/***************************************************************
1047** Convert file pointer to value consistent with SOURCE-ID.
1048***************************************************************/
1049cell_t ffConvertStreamToSourceID( FileStream *Stream )
1050{
1051 cell_t Result;
1052 if(Stream == PF_STDIN)
1053 {
1054 Result = 0;
1055 }
1056 else if(Stream == NULL)
1057 {
1058 Result = -1;
1059 }
1060 else
1061 {
1062 Result = (cell_t) Stream;
1063 }
1064 return Result;
1065}
1066
1067/***************************************************************
1068** Convert file pointer to value consistent with SOURCE-ID.
1069***************************************************************/
1070FileStream * ffConvertSourceIDToStream( cell_t id )
1071{
1072 FileStream *stream;
1073
1074 if( id == 0 )
1075 {
1076 stream = PF_STDIN;
1077 }
1078 else if( id == -1 )
1079 {
1080 stream = NULL;
1081 }
1082 else
1083 {
1084 stream = (FileStream *) id;
1085 }
1086 return stream;
1087}
1088
1089/**************************************************************
1090** Receive line from input stream.
1091** Return length, or -1 for EOF.
1092*/
1093#define BACKSPACE (8)
1094static cell_t readLineFromStream( char *buffer, cell_t maxChars, FileStream *stream )
1095{
1096 int c;
1097 int len;
1098 char *p;
1099 static int lastChar = 0;
1100 int done = 0;
1101
1102DBUGX(("readLineFromStream(0x%x, 0x%x, 0x%x)\n", buffer, len, stream ));
1103 p = buffer;
1104 len = 0;
1105 while( (len < maxChars) && !done )
1106 {
1107 c = sdInputChar(stream);
1108 switch(c)
1109 {
1110 case EOF:
1111 DBUG(("EOF\n"));
1112 done = 1;
1113 if( len <= 0 ) len = -1;
1114 break;
1115
1116 case '\n':
1117 DBUGX(("EOL=\\n\n"));
1118 if( lastChar != '\r' ) done = 1;
1119 break;
1120
1121 case '\r':
1122 DBUGX(("EOL=\\r\n"));
1123 done = 1;
1124 break;
1125
1126 default:
1127 *p++ = (char) c;
1128 len++;
1129 break;
1130 }
1131 lastChar = c;
1132 }
1133
1134/* NUL terminate line to simplify printing when debugging. */
1135 if( (len >= 0) && (len < maxChars) ) p[len] = '\0';
1136
1137 return len;
1138}
1139
1140/**************************************************************
1141** ( -- , fill Source from current stream )
1142** Return 1 if successful, 0 for EOF, or a negative error.
1143*/
1144cell_t ffRefill( void )
1145{
1146 cell_t Num;
1147 cell_t Result = 1;
1148
1149/* reset >IN for parser */
1150 gCurrentTask->td_IN = 0;
1151
1152/* get line from current stream */
1153 if( gCurrentTask->td_InputStream == PF_STDIN )
1154 {
1155 /* ACCEPT is deferred so we call it through the dictionary. */
1156 PUSH_DATA_STACK( gCurrentTask->td_SourcePtr );
1157 PUSH_DATA_STACK( TIB_SIZE );
1158 pfCatch( gAcceptP_XT );
1159 Num = POP_DATA_STACK;
1160 if( Num < 0 )
1161 {
1162 Result = Num;
1163 goto error;
1164 }
1165 }
1166 else
1167 {
1168 Num = readLineFromStream( gCurrentTask->td_SourcePtr, TIB_SIZE,
1169 gCurrentTask->td_InputStream );
1170 if( Num == EOF )
1171 {
1172 Result = 0;
1173 Num = 0;
1174 }
1175 }
1176
1177 gCurrentTask->td_SourceNum = Num;
1178 gCurrentTask->td_LineNumber++; /* Bump for include. */
1179
1180/* echo input if requested */
1181 if( gVarEcho && ( Num > 0))
1182 {
1183 ioType( gCurrentTask->td_SourcePtr, gCurrentTask->td_SourceNum );
1184 EMIT_CR;
1185 }
1186
1187error:
1188 return Result;
1189}
Fork of 'github/philburk/pforth', a portable ANS-like Forth written in ANSI C.