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ee890fe2 SS |
1 | /* Functions for generic Darwin as target machine for GNU C compiler. |
2 | Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001 | |
3 | Free Software Foundation, Inc. | |
4 | Contributed by Apple Computer Inc. | |
5 | ||
6 | This file is part of GNU CC. | |
7 | ||
8 | GNU CC is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GNU CC is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU CC; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "config.h" | |
24 | #include "system.h" | |
25 | #include "rtl.h" | |
26 | #include "regs.h" | |
27 | #include "hard-reg-set.h" | |
28 | #include "real.h" | |
29 | #include "insn-config.h" | |
30 | #include "conditions.h" | |
31 | #include "insn-flags.h" | |
32 | #include "output.h" | |
33 | #include "insn-attr.h" | |
34 | #include "flags.h" | |
35 | #include "tree.h" | |
36 | #include "expr.h" | |
37 | #include "reload.h" | |
ee890fe2 SS |
38 | #include "function.h" |
39 | #include "ggc.h" | |
3ac88239 | 40 | #include "langhooks.h" |
ee890fe2 SS |
41 | |
42 | #include "darwin-protos.h" | |
43 | ||
44 | extern void machopic_output_stub PARAMS ((FILE *, const char *, const char *)); | |
45 | ||
46 | static int machopic_data_defined_p PARAMS ((const char *)); | |
47 | static int func_name_maybe_scoped PARAMS ((const char *)); | |
df56a27f | 48 | static void update_non_lazy_ptrs PARAMS ((const char *)); |
4e08ba6c | 49 | static void update_stubs PARAMS ((const char *)); |
ee890fe2 | 50 | |
ee890fe2 SS |
51 | int |
52 | name_needs_quotes (name) | |
53 | const char *name; | |
54 | { | |
55 | int c; | |
56 | while ((c = *name++) != '\0') | |
0df6c2c7 | 57 | if (! ISIDNUM (c)) |
ee890fe2 SS |
58 | return 1; |
59 | return 0; | |
60 | } | |
61 | ||
62 | /* | |
63 | * flag_pic = 1 ... generate only indirections | |
64 | * flag_pic = 2 ... generate indirections and pure code | |
65 | */ | |
66 | ||
67 | /* This module assumes that (const (symbol_ref "foo")) is a legal pic | |
68 | reference, which will not be changed. */ | |
69 | ||
70 | static tree machopic_defined_list; | |
71 | ||
72 | enum machopic_addr_class | |
73 | machopic_classify_ident (ident) | |
74 | tree ident; | |
75 | { | |
76 | const char *name = IDENTIFIER_POINTER (ident); | |
77 | int lprefix = (((name[0] == '*' || name[0] == '&') | |
78 | && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L'))) | |
79 | || ( name[0] == '_' | |
80 | && name[1] == 'O' | |
81 | && name[2] == 'B' | |
82 | && name[3] == 'J' | |
83 | && name[4] == 'C' | |
84 | && name[5] == '_')); | |
df56a27f | 85 | tree temp; |
ee890fe2 | 86 | |
df56a27f | 87 | if (name[0] != '!') |
ee890fe2 | 88 | { |
df56a27f | 89 | /* Here if no special encoding to be found. */ |
ee890fe2 SS |
90 | if (lprefix) |
91 | { | |
92 | const char *name = IDENTIFIER_POINTER (ident); | |
93 | int len = strlen (name); | |
94 | ||
95 | if ((len > 5 && !strcmp (name + len - 5, "$stub")) | |
96 | || (len > 6 && !strcmp (name + len - 6, "$stub\""))) | |
97 | return MACHOPIC_DEFINED_FUNCTION; | |
98 | return MACHOPIC_DEFINED_DATA; | |
99 | } | |
100 | ||
101 | for (temp = machopic_defined_list; | |
102 | temp != NULL_TREE; | |
103 | temp = TREE_CHAIN (temp)) | |
104 | { | |
105 | if (ident == TREE_VALUE (temp)) | |
106 | return MACHOPIC_DEFINED_DATA; | |
107 | } | |
108 | ||
109 | if (TREE_ASM_WRITTEN (ident)) | |
110 | return MACHOPIC_DEFINED_DATA; | |
111 | ||
112 | return MACHOPIC_UNDEFINED; | |
113 | } | |
114 | ||
df56a27f SS |
115 | else if (name[1] == 'D') |
116 | return MACHOPIC_DEFINED_DATA; | |
ee890fe2 | 117 | |
df56a27f SS |
118 | else if (name[1] == 'T') |
119 | return MACHOPIC_DEFINED_FUNCTION; | |
ee890fe2 | 120 | |
b7fb9feb TC |
121 | /* It is possible that someone is holding a "stale" name, which has |
122 | since been defined. See if there is a "defined" name (i.e, | |
123 | different from NAME only in having a '!D_' or a '!T_' instead of | |
124 | a '!d_' or '!t_' prefix) in the identifier hash tables. If so, say | |
125 | that this identifier is defined. */ | |
126 | else if (name[1] == 'd' || name[1] == 't') | |
127 | { | |
128 | char *new_name; | |
129 | new_name = (char *)alloca (strlen (name) + 1); | |
130 | strcpy (new_name, name); | |
131 | new_name[1] = (name[1] == 'd') ? 'D' : 'T'; | |
132 | if (maybe_get_identifier (new_name) != NULL) | |
133 | return (name[1] == 'd') ? MACHOPIC_DEFINED_DATA | |
134 | : MACHOPIC_DEFINED_FUNCTION; | |
135 | } | |
136 | ||
ee890fe2 SS |
137 | for (temp = machopic_defined_list; temp != NULL_TREE; temp = TREE_CHAIN (temp)) |
138 | { | |
139 | if (ident == TREE_VALUE (temp)) | |
140 | { | |
df56a27f | 141 | if (name[1] == 'T') |
ee890fe2 SS |
142 | return MACHOPIC_DEFINED_FUNCTION; |
143 | else | |
144 | return MACHOPIC_DEFINED_DATA; | |
145 | } | |
146 | } | |
147 | ||
df56a27f | 148 | if (name[1] == 't' || name[1] == 'T') |
ee890fe2 SS |
149 | { |
150 | if (lprefix) | |
151 | return MACHOPIC_DEFINED_FUNCTION; | |
152 | else | |
153 | return MACHOPIC_UNDEFINED_FUNCTION; | |
154 | } | |
155 | else | |
156 | { | |
157 | if (lprefix) | |
158 | return MACHOPIC_DEFINED_DATA; | |
159 | else | |
160 | return MACHOPIC_UNDEFINED_DATA; | |
161 | } | |
162 | } | |
163 | ||
164 | ||
165 | enum machopic_addr_class | |
166 | machopic_classify_name (name) | |
167 | const char *name; | |
168 | { | |
169 | return machopic_classify_ident (get_identifier (name)); | |
170 | } | |
171 | ||
172 | int | |
173 | machopic_ident_defined_p (ident) | |
174 | tree ident; | |
175 | { | |
176 | switch (machopic_classify_ident (ident)) | |
177 | { | |
178 | case MACHOPIC_UNDEFINED: | |
179 | case MACHOPIC_UNDEFINED_DATA: | |
180 | case MACHOPIC_UNDEFINED_FUNCTION: | |
181 | return 0; | |
182 | default: | |
183 | return 1; | |
184 | } | |
185 | } | |
186 | ||
187 | static int | |
188 | machopic_data_defined_p (name) | |
189 | const char *name; | |
190 | { | |
191 | switch (machopic_classify_ident (get_identifier (name))) | |
192 | { | |
193 | case MACHOPIC_DEFINED_DATA: | |
194 | return 1; | |
195 | default: | |
196 | return 0; | |
197 | } | |
198 | } | |
199 | ||
200 | int | |
201 | machopic_name_defined_p (name) | |
202 | const char *name; | |
203 | { | |
204 | return machopic_ident_defined_p (get_identifier (name)); | |
205 | } | |
206 | ||
207 | void | |
208 | machopic_define_ident (ident) | |
209 | tree ident; | |
210 | { | |
211 | if (!machopic_ident_defined_p (ident)) | |
212 | machopic_defined_list = | |
213 | tree_cons (NULL_TREE, ident, machopic_defined_list); | |
214 | } | |
215 | ||
216 | void | |
217 | machopic_define_name (name) | |
218 | const char *name; | |
219 | { | |
220 | machopic_define_ident (get_identifier (name)); | |
221 | } | |
222 | ||
ee890fe2 SS |
223 | /* This is a static to make inline functions work. The rtx |
224 | representing the PIC base symbol always points to here. */ | |
225 | ||
226 | static char function_base[32]; | |
227 | ||
228 | static int current_pic_label_num; | |
229 | ||
230 | char * | |
231 | machopic_function_base_name () | |
232 | { | |
c0cbc013 | 233 | static const char *name = NULL; |
ee890fe2 SS |
234 | static const char *current_name; |
235 | ||
236 | current_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); | |
237 | ||
238 | if (name != current_name) | |
239 | { | |
240 | current_function_uses_pic_offset_table = 1; | |
241 | ||
242 | /* Save mucho space and time. Some of the C++ mangled names are over | |
243 | 700 characters long! Note that we produce a label containing a '-' | |
244 | if the function we're compiling is an Objective-C method, as evinced | |
245 | by the incredibly scientific test below. This is because code in | |
246 | rs6000.c makes the same ugly test when loading the PIC reg. */ | |
247 | ||
248 | ++current_pic_label_num; | |
249 | if (*current_name == '+' || *current_name == '-') | |
250 | sprintf (function_base, "*\"L-%d$pb\"", current_pic_label_num); | |
251 | else | |
252 | sprintf (function_base, "*L%d$pb", current_pic_label_num); | |
253 | ||
254 | name = current_name; | |
255 | } | |
256 | ||
257 | return function_base; | |
258 | } | |
259 | ||
260 | static tree machopic_non_lazy_pointers = NULL; | |
261 | ||
262 | /* Return a non-lazy pointer name corresponding to the given name, | |
263 | either by finding it in our list of pointer names, or by generating | |
264 | a new one. */ | |
265 | ||
266 | char * | |
267 | machopic_non_lazy_ptr_name (name) | |
268 | const char *name; | |
269 | { | |
df56a27f | 270 | char *temp_name; |
ee890fe2 SS |
271 | tree temp, ident = get_identifier (name); |
272 | ||
273 | for (temp = machopic_non_lazy_pointers; | |
274 | temp != NULL_TREE; | |
275 | temp = TREE_CHAIN (temp)) | |
276 | { | |
277 | if (ident == TREE_VALUE (temp)) | |
278 | return IDENTIFIER_POINTER (TREE_PURPOSE (temp)); | |
279 | } | |
280 | ||
df56a27f SS |
281 | STRIP_NAME_ENCODING (name, name); |
282 | ||
283 | /* Try again, but comparing names this time. */ | |
284 | for (temp = machopic_non_lazy_pointers; | |
285 | temp != NULL_TREE; | |
286 | temp = TREE_CHAIN (temp)) | |
287 | { | |
288 | if (TREE_VALUE (temp)) | |
289 | { | |
290 | temp_name = IDENTIFIER_POINTER (TREE_VALUE (temp)); | |
291 | STRIP_NAME_ENCODING (temp_name, temp_name); | |
292 | if (strcmp (name, temp_name) == 0) | |
293 | return IDENTIFIER_POINTER (TREE_PURPOSE (temp)); | |
294 | } | |
295 | } | |
296 | ||
ee890fe2 SS |
297 | { |
298 | char *buffer; | |
299 | tree ptr_name; | |
300 | ||
301 | buffer = alloca (strlen (name) + 20); | |
302 | ||
303 | strcpy (buffer, "&L"); | |
304 | if (name[0] == '*') | |
305 | strcat (buffer, name+1); | |
306 | else | |
307 | { | |
308 | strcat (buffer, "_"); | |
309 | strcat (buffer, name); | |
310 | } | |
311 | ||
312 | strcat (buffer, "$non_lazy_ptr"); | |
313 | ptr_name = get_identifier (buffer); | |
314 | ||
315 | machopic_non_lazy_pointers | |
316 | = tree_cons (ptr_name, ident, machopic_non_lazy_pointers); | |
317 | ||
318 | TREE_USED (machopic_non_lazy_pointers) = 0; | |
319 | ||
320 | return IDENTIFIER_POINTER (ptr_name); | |
321 | } | |
322 | } | |
323 | ||
324 | static tree machopic_stubs = 0; | |
325 | ||
326 | /* Make sure the GC knows about our homemade lists. */ | |
327 | ||
328 | void | |
329 | machopic_add_gc_roots () | |
330 | { | |
331 | ggc_add_tree_root (&machopic_defined_list, 1); | |
332 | ggc_add_tree_root (&machopic_non_lazy_pointers, 1); | |
333 | ggc_add_tree_root (&machopic_stubs, 1); | |
334 | } | |
335 | ||
336 | /* Return the name of the stub corresponding to the given name, | |
337 | generating a new stub name if necessary. */ | |
338 | ||
339 | char * | |
340 | machopic_stub_name (name) | |
341 | const char *name; | |
342 | { | |
343 | tree temp, ident = get_identifier (name); | |
93913281 SS |
344 | const char *tname; |
345 | ||
ee890fe2 SS |
346 | for (temp = machopic_stubs; |
347 | temp != NULL_TREE; | |
348 | temp = TREE_CHAIN (temp)) | |
349 | { | |
350 | if (ident == TREE_VALUE (temp)) | |
351 | return IDENTIFIER_POINTER (TREE_PURPOSE (temp)); | |
93913281 SS |
352 | tname = IDENTIFIER_POINTER (TREE_VALUE (temp)); |
353 | if (strcmp (name, tname) == 0) | |
354 | return IDENTIFIER_POINTER (TREE_PURPOSE (temp)); | |
355 | /* A library call name might not be section-encoded yet, so try | |
356 | it against a stripped name. */ | |
357 | if (name[0] != '!' | |
358 | && tname[0] == '!' | |
359 | && strcmp (name, tname + 4) == 0) | |
4e08ba6c | 360 | return IDENTIFIER_POINTER (TREE_PURPOSE (temp)); |
ee890fe2 SS |
361 | } |
362 | ||
df56a27f SS |
363 | STRIP_NAME_ENCODING (name, name); |
364 | ||
ee890fe2 SS |
365 | { |
366 | char *buffer; | |
367 | tree ptr_name; | |
368 | int needs_quotes = name_needs_quotes (name); | |
369 | ||
370 | buffer = alloca (strlen (name) + 20); | |
371 | ||
372 | if (needs_quotes) | |
373 | strcpy (buffer, "&\"L"); | |
374 | else | |
375 | strcpy (buffer, "&L"); | |
376 | if (name[0] == '*') | |
377 | { | |
378 | strcat (buffer, name+1); | |
379 | } | |
380 | else | |
381 | { | |
382 | strcat (buffer, "_"); | |
383 | strcat (buffer, name); | |
384 | } | |
385 | ||
386 | if (needs_quotes) | |
387 | strcat (buffer, "$stub\""); | |
388 | else | |
389 | strcat (buffer, "$stub"); | |
390 | ptr_name = get_identifier (buffer); | |
391 | ||
392 | machopic_stubs = tree_cons (ptr_name, ident, machopic_stubs); | |
393 | TREE_USED (machopic_stubs) = 0; | |
394 | ||
395 | return IDENTIFIER_POINTER (ptr_name); | |
396 | } | |
397 | } | |
398 | ||
399 | void | |
400 | machopic_validate_stub_or_non_lazy_ptr (name, validate_stub) | |
401 | const char *name; | |
402 | int validate_stub; | |
403 | { | |
df56a27f SS |
404 | char *real_name; |
405 | tree temp, ident = get_identifier (name), id2; | |
ee890fe2 SS |
406 | |
407 | for (temp = (validate_stub ? machopic_stubs : machopic_non_lazy_pointers); | |
408 | temp != NULL_TREE; | |
409 | temp = TREE_CHAIN (temp)) | |
410 | if (ident == TREE_PURPOSE (temp)) | |
411 | { | |
412 | /* Mark both the stub or non-lazy pointer as well as the | |
413 | original symbol as being referenced. */ | |
414 | TREE_USED (temp) = 1; | |
415 | if (TREE_CODE (TREE_VALUE (temp)) == IDENTIFIER_NODE) | |
416 | TREE_SYMBOL_REFERENCED (TREE_VALUE (temp)) = 1; | |
df56a27f SS |
417 | STRIP_NAME_ENCODING (real_name, IDENTIFIER_POINTER (TREE_VALUE (temp))); |
418 | id2 = maybe_get_identifier (real_name); | |
419 | if (id2) | |
420 | TREE_SYMBOL_REFERENCED (id2) = 1; | |
ee890fe2 SS |
421 | } |
422 | } | |
423 | ||
424 | /* Transform ORIG, which may be any data source, to the corresponding | |
425 | source using indirections. */ | |
426 | ||
427 | rtx | |
428 | machopic_indirect_data_reference (orig, reg) | |
429 | rtx orig, reg; | |
430 | { | |
431 | rtx ptr_ref = orig; | |
432 | ||
433 | if (! MACHOPIC_INDIRECT) | |
434 | return orig; | |
435 | ||
436 | if (GET_CODE (orig) == SYMBOL_REF) | |
437 | { | |
438 | const char *name = XSTR (orig, 0); | |
439 | ||
440 | if (machopic_data_defined_p (name)) | |
441 | { | |
442 | rtx pic_base = gen_rtx (SYMBOL_REF, Pmode, | |
443 | machopic_function_base_name ()); | |
444 | rtx offset = gen_rtx (CONST, Pmode, | |
445 | gen_rtx (MINUS, Pmode, orig, pic_base)); | |
446 | ||
447 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
448 | rtx hi_sum_reg = reg; | |
449 | ||
450 | if (reg == NULL) | |
451 | abort (); | |
452 | ||
453 | emit_insn (gen_rtx (SET, Pmode, hi_sum_reg, | |
454 | gen_rtx (PLUS, Pmode, pic_offset_table_rtx, | |
455 | gen_rtx (HIGH, Pmode, offset)))); | |
456 | emit_insn (gen_rtx (SET, Pmode, reg, | |
457 | gen_rtx (LO_SUM, Pmode, hi_sum_reg, offset))); | |
458 | ||
459 | orig = reg; | |
460 | #else | |
461 | #if defined (HAVE_lo_sum) | |
462 | if (reg == 0) abort (); | |
463 | ||
464 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
465 | gen_rtx (HIGH, Pmode, offset))); | |
466 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
467 | gen_rtx (LO_SUM, Pmode, reg, offset))); | |
468 | emit_insn (gen_rtx (USE, VOIDmode, | |
469 | gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM))); | |
470 | ||
471 | orig = gen_rtx (PLUS, Pmode, pic_offset_table_rtx, reg); | |
472 | #endif | |
473 | #endif | |
474 | return orig; | |
475 | } | |
476 | ||
477 | ptr_ref = gen_rtx (SYMBOL_REF, Pmode, | |
478 | machopic_non_lazy_ptr_name (name)); | |
479 | ||
480 | ptr_ref = gen_rtx_MEM (Pmode, ptr_ref); | |
481 | RTX_UNCHANGING_P (ptr_ref) = 1; | |
482 | ||
483 | return ptr_ref; | |
484 | } | |
485 | else if (GET_CODE (orig) == CONST) | |
486 | { | |
487 | rtx base, result; | |
488 | ||
489 | /* legitimize both operands of the PLUS */ | |
490 | if (GET_CODE (XEXP (orig, 0)) == PLUS) | |
491 | { | |
492 | base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0), | |
493 | reg); | |
494 | orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1), | |
495 | (base == reg ? 0 : reg)); | |
496 | } | |
497 | else | |
498 | return orig; | |
499 | ||
500 | if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT) | |
ed8908e7 | 501 | result = plus_constant (base, INTVAL (orig)); |
ee890fe2 | 502 | else |
ed8908e7 | 503 | result = gen_rtx (PLUS, Pmode, base, orig); |
ee890fe2 SS |
504 | |
505 | if (RTX_UNCHANGING_P (base) && RTX_UNCHANGING_P (orig)) | |
506 | RTX_UNCHANGING_P (result) = 1; | |
507 | ||
508 | if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM) | |
509 | { | |
510 | if (reg) | |
511 | { | |
512 | emit_move_insn (reg, result); | |
513 | result = reg; | |
514 | } | |
515 | else | |
516 | { | |
517 | result = force_reg (GET_MODE (result), result); | |
518 | } | |
519 | } | |
520 | ||
521 | return result; | |
522 | ||
523 | } | |
524 | else if (GET_CODE (orig) == MEM) | |
525 | XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg); | |
526 | /* When the target is i386, this code prevents crashes due to the | |
527 | compiler's ignorance on how to move the PIC base register to | |
528 | other registers. (The reload phase sometimes introduces such | |
529 | insns.) */ | |
530 | else if (GET_CODE (orig) == PLUS | |
531 | && GET_CODE (XEXP (orig, 0)) == REG | |
532 | && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM | |
533 | #ifdef I386 | |
534 | /* Prevent the same register from being erroneously used | |
535 | as both the base and index registers. */ | |
536 | && GET_CODE (XEXP (orig, 1)) == CONST | |
537 | #endif | |
538 | && reg) | |
539 | { | |
540 | emit_move_insn (reg, XEXP (orig, 0)); | |
541 | XEXP (ptr_ref, 0) = reg; | |
542 | } | |
543 | return ptr_ref; | |
544 | } | |
545 | ||
ee890fe2 SS |
546 | /* Transform TARGET (a MEM), which is a function call target, to the |
547 | corresponding symbol_stub if necessary. Return a new MEM. */ | |
548 | ||
549 | rtx | |
550 | machopic_indirect_call_target (target) | |
551 | rtx target; | |
552 | { | |
553 | if (GET_CODE (target) != MEM) | |
554 | return target; | |
555 | ||
556 | if (MACHOPIC_INDIRECT && GET_CODE (XEXP (target, 0)) == SYMBOL_REF) | |
557 | { | |
558 | enum machine_mode mode = GET_MODE (XEXP (target, 0)); | |
559 | const char *name = XSTR (XEXP (target, 0), 0); | |
560 | ||
b7fb9feb TC |
561 | /* If the name is already defined, we need do nothing. */ |
562 | if (name[0] == '!' && name[1] == 'T') | |
563 | return target; | |
564 | ||
565 | if (!machopic_name_defined_p (name)) | |
ee890fe2 SS |
566 | { |
567 | const char *stub_name = machopic_stub_name (name); | |
568 | ||
569 | XEXP (target, 0) = gen_rtx (SYMBOL_REF, mode, stub_name); | |
570 | RTX_UNCHANGING_P (target) = 1; | |
571 | } | |
572 | } | |
573 | ||
574 | return target; | |
575 | } | |
576 | ||
577 | rtx | |
578 | machopic_legitimize_pic_address (orig, mode, reg) | |
579 | rtx orig, reg; | |
580 | enum machine_mode mode; | |
581 | { | |
582 | rtx pic_ref = orig; | |
583 | ||
584 | if (! MACHOPIC_PURE) | |
585 | return orig; | |
586 | ||
587 | /* First handle a simple SYMBOL_REF or LABEL_REF */ | |
588 | if (GET_CODE (orig) == LABEL_REF | |
589 | || (GET_CODE (orig) == SYMBOL_REF | |
590 | )) | |
591 | { | |
592 | /* addr(foo) = &func+(foo-func) */ | |
593 | rtx pic_base; | |
594 | ||
595 | orig = machopic_indirect_data_reference (orig, reg); | |
596 | ||
597 | if (GET_CODE (orig) == PLUS | |
598 | && GET_CODE (XEXP (orig, 0)) == REG) | |
599 | { | |
600 | if (reg == 0) | |
601 | return force_reg (mode, orig); | |
602 | ||
603 | emit_move_insn (reg, orig); | |
604 | return reg; | |
605 | } | |
606 | ||
607 | pic_base = gen_rtx (SYMBOL_REF, Pmode, machopic_function_base_name ()); | |
608 | ||
609 | if (GET_CODE (orig) == MEM) | |
610 | { | |
611 | if (reg == 0) | |
612 | { | |
613 | if (reload_in_progress) | |
614 | abort (); | |
615 | else | |
616 | reg = gen_reg_rtx (Pmode); | |
617 | } | |
618 | ||
619 | #ifdef HAVE_lo_sum | |
620 | if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
621 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
622 | { | |
623 | rtx offset = gen_rtx (CONST, Pmode, | |
624 | gen_rtx (MINUS, Pmode, | |
625 | XEXP (orig, 0), pic_base)); | |
626 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
627 | /* Generating a new reg may expose opportunities for | |
628 | common subexpression elimination. */ | |
629 | rtx hi_sum_reg = | |
630 | (reload_in_progress ? reg : gen_reg_rtx (SImode)); | |
631 | ||
632 | emit_insn (gen_rtx (SET, Pmode, hi_sum_reg, | |
633 | gen_rtx (PLUS, Pmode, | |
634 | pic_offset_table_rtx, | |
635 | gen_rtx (HIGH, Pmode, offset)))); | |
636 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
637 | gen_rtx (MEM, GET_MODE (orig), | |
638 | gen_rtx (LO_SUM, Pmode, | |
639 | hi_sum_reg, offset)))); | |
640 | pic_ref = reg; | |
641 | ||
642 | #else | |
643 | emit_insn (gen_rtx (USE, VOIDmode, | |
644 | gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM))); | |
645 | ||
646 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
647 | gen_rtx (HIGH, Pmode, | |
648 | gen_rtx (CONST, Pmode, offset)))); | |
649 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
650 | gen_rtx (LO_SUM, Pmode, reg, | |
651 | gen_rtx (CONST, Pmode, offset)))); | |
652 | pic_ref = gen_rtx (PLUS, Pmode, | |
653 | pic_offset_table_rtx, reg); | |
654 | #endif | |
655 | } | |
656 | else | |
657 | #endif /* HAVE_lo_sum */ | |
658 | { | |
659 | rtx pic = pic_offset_table_rtx; | |
660 | if (GET_CODE (pic) != REG) | |
661 | { | |
662 | emit_move_insn (reg, pic); | |
663 | pic = reg; | |
664 | } | |
665 | #if 0 | |
666 | emit_insn (gen_rtx (USE, VOIDmode, | |
667 | gen_rtx (REG, Pmode, PIC_OFFSET_TABLE_REGNUM))); | |
668 | #endif | |
669 | ||
670 | pic_ref = gen_rtx (PLUS, Pmode, | |
671 | pic, | |
672 | gen_rtx (CONST, Pmode, | |
673 | gen_rtx (MINUS, Pmode, | |
674 | XEXP (orig, 0), | |
675 | pic_base))); | |
676 | } | |
677 | ||
678 | #if !defined (TARGET_TOC) | |
679 | RTX_UNCHANGING_P (pic_ref) = 1; | |
680 | emit_move_insn (reg, pic_ref); | |
681 | pic_ref = gen_rtx (MEM, GET_MODE (orig), reg); | |
682 | #endif | |
683 | } | |
684 | else | |
685 | { | |
686 | ||
687 | #ifdef HAVE_lo_sum | |
688 | if (GET_CODE (orig) == SYMBOL_REF | |
689 | || GET_CODE (orig) == LABEL_REF) | |
690 | { | |
691 | rtx offset = gen_rtx (CONST, Pmode, | |
692 | gen_rtx (MINUS, Pmode, orig, pic_base)); | |
693 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
694 | rtx hi_sum_reg; | |
695 | ||
696 | if (reg == 0) | |
697 | { | |
698 | if (reload_in_progress) | |
699 | abort (); | |
700 | else | |
701 | reg = gen_reg_rtx (SImode); | |
702 | } | |
703 | ||
704 | hi_sum_reg = reg; | |
705 | ||
706 | emit_insn (gen_rtx (SET, Pmode, hi_sum_reg, | |
707 | gen_rtx (PLUS, Pmode, | |
708 | pic_offset_table_rtx, | |
709 | gen_rtx (HIGH, Pmode, offset)))); | |
710 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
711 | gen_rtx (LO_SUM, Pmode, | |
712 | hi_sum_reg, offset))); | |
713 | pic_ref = reg; | |
714 | #else | |
715 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
716 | gen_rtx (HIGH, Pmode, offset))); | |
717 | emit_insn (gen_rtx (SET, VOIDmode, reg, | |
718 | gen_rtx (LO_SUM, Pmode, reg, offset))); | |
719 | pic_ref = gen_rtx (PLUS, Pmode, | |
720 | pic_offset_table_rtx, reg); | |
721 | #endif | |
722 | } | |
723 | else | |
724 | #endif /* HAVE_lo_sum */ | |
725 | { | |
726 | if (GET_CODE (orig) == REG) | |
727 | { | |
728 | return orig; | |
729 | } | |
730 | else | |
731 | { | |
732 | rtx pic = pic_offset_table_rtx; | |
733 | if (GET_CODE (pic) != REG) | |
734 | { | |
735 | emit_move_insn (reg, pic); | |
736 | pic = reg; | |
737 | } | |
738 | #if 0 | |
739 | emit_insn (gen_rtx (USE, VOIDmode, | |
740 | pic_offset_table_rtx)); | |
741 | #endif | |
742 | pic_ref = gen_rtx (PLUS, Pmode, | |
743 | pic, | |
744 | gen_rtx (CONST, Pmode, | |
745 | gen_rtx (MINUS, Pmode, | |
746 | orig, pic_base))); | |
747 | } | |
748 | } | |
749 | } | |
750 | ||
751 | RTX_UNCHANGING_P (pic_ref) = 1; | |
752 | ||
753 | if (GET_CODE (pic_ref) != REG) | |
754 | { | |
755 | if (reg != 0) | |
756 | { | |
757 | emit_move_insn (reg, pic_ref); | |
758 | return reg; | |
759 | } | |
760 | else | |
761 | { | |
762 | return force_reg (mode, pic_ref); | |
763 | } | |
764 | } | |
765 | else | |
766 | { | |
767 | return pic_ref; | |
768 | } | |
769 | } | |
770 | ||
771 | else if (GET_CODE (orig) == SYMBOL_REF) | |
772 | return orig; | |
773 | ||
774 | else if (GET_CODE (orig) == PLUS | |
775 | && (GET_CODE (XEXP (orig, 0)) == MEM | |
776 | || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
777 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
778 | && XEXP (orig, 0) != pic_offset_table_rtx | |
779 | && GET_CODE (XEXP (orig, 1)) != REG) | |
780 | ||
781 | { | |
782 | rtx base; | |
783 | int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM); | |
784 | ||
785 | base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
786 | orig = machopic_legitimize_pic_address (XEXP (orig, 1), | |
787 | Pmode, (base == reg ? 0 : reg)); | |
788 | if (GET_CODE (orig) == CONST_INT) | |
789 | { | |
ed8908e7 | 790 | pic_ref = plus_constant (base, INTVAL (orig)); |
ee890fe2 SS |
791 | is_complex = 1; |
792 | } | |
793 | else | |
ed8908e7 | 794 | pic_ref = gen_rtx (PLUS, Pmode, base, orig); |
ee890fe2 SS |
795 | |
796 | if (RTX_UNCHANGING_P (base) && RTX_UNCHANGING_P (orig)) | |
797 | RTX_UNCHANGING_P (pic_ref) = 1; | |
798 | ||
799 | if (reg && is_complex) | |
800 | { | |
801 | emit_move_insn (reg, pic_ref); | |
802 | pic_ref = reg; | |
803 | } | |
804 | /* Likewise, should we set special REG_NOTEs here? */ | |
805 | } | |
806 | ||
807 | else if (GET_CODE (orig) == CONST) | |
808 | { | |
809 | return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
810 | } | |
811 | ||
812 | else if (GET_CODE (orig) == MEM | |
813 | && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF) | |
814 | { | |
815 | rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
816 | ||
817 | addr = gen_rtx (MEM, GET_MODE (orig), addr); | |
818 | RTX_UNCHANGING_P (addr) = RTX_UNCHANGING_P (orig); | |
819 | emit_move_insn (reg, addr); | |
820 | pic_ref = reg; | |
821 | } | |
822 | ||
823 | return pic_ref; | |
824 | } | |
825 | ||
826 | ||
827 | void | |
828 | machopic_finish (asm_out_file) | |
829 | FILE *asm_out_file; | |
830 | { | |
831 | tree temp; | |
832 | ||
833 | for (temp = machopic_stubs; | |
834 | temp != NULL_TREE; | |
835 | temp = TREE_CHAIN (temp)) | |
836 | { | |
91dc3130 KG |
837 | const char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp)); |
838 | const char *stub_name = IDENTIFIER_POINTER (TREE_PURPOSE (temp)); | |
ee890fe2 SS |
839 | char *sym; |
840 | char *stub; | |
ee890fe2 SS |
841 | |
842 | if (! TREE_USED (temp)) | |
843 | continue; | |
844 | ||
b7fb9feb TC |
845 | /* If the symbol is actually defined, we don't need a stub. */ |
846 | if (sym_name[0] == '!' && sym_name[1] == 'T') | |
847 | continue; | |
848 | ||
df56a27f | 849 | STRIP_NAME_ENCODING (sym_name, sym_name); |
ee890fe2 SS |
850 | |
851 | sym = alloca (strlen (sym_name) + 2); | |
852 | if (sym_name[0] == '*' || sym_name[0] == '&') | |
853 | strcpy (sym, sym_name + 1); | |
854 | else if (sym_name[0] == '-' || sym_name[0] == '+') | |
855 | strcpy (sym, sym_name); | |
856 | else | |
857 | sym[0] = '_', strcpy (sym + 1, sym_name); | |
858 | ||
859 | stub = alloca (strlen (stub_name) + 2); | |
860 | if (stub_name[0] == '*' || stub_name[0] == '&') | |
861 | strcpy (stub, stub_name + 1); | |
862 | else | |
863 | stub[0] = '_', strcpy (stub + 1, stub_name); | |
864 | ||
865 | machopic_output_stub (asm_out_file, sym, stub); | |
866 | } | |
867 | ||
868 | for (temp = machopic_non_lazy_pointers; | |
869 | temp != NULL_TREE; | |
870 | temp = TREE_CHAIN (temp)) | |
871 | { | |
872 | char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp)); | |
873 | char *lazy_name = IDENTIFIER_POINTER (TREE_PURPOSE (temp)); | |
874 | #if 0 | |
875 | tree decl = lookup_name_darwin (TREE_VALUE (temp)); | |
876 | #endif | |
877 | ||
878 | if (! TREE_USED (temp)) | |
879 | continue; | |
880 | ||
881 | if (machopic_ident_defined_p (TREE_VALUE (temp)) | |
882 | #if 0 /* add back when we have private externs */ | |
883 | || (decl && DECL_PRIVATE_EXTERN (decl)) | |
884 | #endif | |
885 | ) | |
886 | { | |
887 | data_section (); | |
c8af3574 | 888 | assemble_align (GET_MODE_ALIGNMENT (Pmode)); |
ee890fe2 SS |
889 | assemble_label (lazy_name); |
890 | assemble_integer (gen_rtx (SYMBOL_REF, Pmode, sym_name), | |
c8af3574 RH |
891 | GET_MODE_SIZE (Pmode), |
892 | GET_MODE_ALIGNMENT (Pmode), 1); | |
ee890fe2 SS |
893 | } |
894 | else | |
895 | { | |
896 | machopic_nl_symbol_ptr_section (); | |
897 | assemble_name (asm_out_file, lazy_name); | |
898 | fprintf (asm_out_file, ":\n"); | |
899 | ||
900 | fprintf (asm_out_file, "\t.indirect_symbol "); | |
901 | assemble_name (asm_out_file, sym_name); | |
902 | fprintf (asm_out_file, "\n"); | |
903 | ||
c8af3574 RH |
904 | assemble_integer (const0_rtx, GET_MODE_SIZE (Pmode), |
905 | GET_MODE_ALIGNMENT (Pmode), 1); | |
ee890fe2 SS |
906 | } |
907 | } | |
908 | } | |
909 | ||
910 | int | |
911 | machopic_operand_p (op) | |
912 | rtx op; | |
913 | { | |
914 | if (MACHOPIC_JUST_INDIRECT) | |
915 | { | |
916 | while (GET_CODE (op) == CONST) | |
917 | op = XEXP (op, 0); | |
918 | ||
919 | if (GET_CODE (op) == SYMBOL_REF) | |
920 | return machopic_name_defined_p (XSTR (op, 0)); | |
921 | else | |
922 | return 0; | |
923 | } | |
924 | ||
925 | while (GET_CODE (op) == CONST) | |
926 | op = XEXP (op, 0); | |
927 | ||
928 | if (GET_CODE (op) == MINUS | |
929 | && GET_CODE (XEXP (op, 0)) == SYMBOL_REF | |
930 | && GET_CODE (XEXP (op, 1)) == SYMBOL_REF | |
931 | && machopic_name_defined_p (XSTR (XEXP (op, 0), 0)) | |
932 | && machopic_name_defined_p (XSTR (XEXP (op, 1), 0))) | |
933 | return 1; | |
934 | ||
935 | #if 0 /*def TARGET_TOC*/ /* i.e., PowerPC */ | |
936 | /* Without this statement, the compiler crashes while compiling enquire.c | |
937 | when targetting PowerPC. It is not known why this code is not needed | |
938 | when targetting other processors. */ | |
939 | else if (GET_CODE (op) == SYMBOL_REF | |
940 | && (machopic_classify_name (XSTR (op, 0)) | |
941 | == MACHOPIC_DEFINED_FUNCTION)) | |
942 | { | |
943 | return 1; | |
944 | } | |
945 | #endif | |
946 | ||
947 | return 0; | |
948 | } | |
df56a27f SS |
949 | |
950 | /* This function records whether a given name corresponds to a defined | |
951 | or undefined function or variable, for machopic_classify_ident to | |
952 | use later. */ | |
953 | ||
954 | void | |
955 | darwin_encode_section_info (decl) | |
956 | tree decl; | |
957 | { | |
958 | char code = '\0'; | |
959 | int defined = 0; | |
353e51f8 | 960 | rtx sym_ref; |
c0cbc013 DJ |
961 | const char *orig_str; |
962 | char *new_str; | |
353e51f8 | 963 | size_t len, new_len; |
df56a27f SS |
964 | |
965 | if ((TREE_CODE (decl) == FUNCTION_DECL | |
966 | || TREE_CODE (decl) == VAR_DECL) | |
70bdc2ff | 967 | && !DECL_EXTERNAL (decl) |
df56a27f SS |
968 | && ((TREE_STATIC (decl) |
969 | && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl))) | |
abe72dd8 SS |
970 | || (DECL_INITIAL (decl) |
971 | && DECL_INITIAL (decl) != error_mark_node))) | |
df56a27f SS |
972 | defined = 1; |
973 | ||
974 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
975 | code = (defined ? 'T' : 't'); | |
976 | else if (TREE_CODE (decl) == VAR_DECL) | |
977 | code = (defined ? 'D' : 'd'); | |
978 | ||
353e51f8 SS |
979 | if (code == '\0') |
980 | return; | |
df56a27f | 981 | |
353e51f8 SS |
982 | sym_ref = XEXP (DECL_RTL (decl), 0); |
983 | orig_str = XSTR (sym_ref, 0); | |
984 | len = strlen (orig_str) + 1; | |
df56a27f | 985 | |
353e51f8 SS |
986 | if (orig_str[0] == '!') |
987 | { | |
988 | /* Already encoded; see if we need to change it. */ | |
989 | if (code == orig_str[1]) | |
990 | return; | |
991 | /* Yes, tweak a copy of the name and put it in a new string. */ | |
992 | new_str = alloca (len); | |
993 | memcpy (new_str, orig_str, len); | |
994 | new_str[1] = code; | |
995 | XSTR (sym_ref, 0) = ggc_alloc_string (new_str, len); | |
353e51f8 SS |
996 | } |
997 | else | |
998 | { | |
999 | /* Add the encoding. */ | |
1000 | new_len = len + 4; | |
1001 | new_str = alloca (new_len); | |
1002 | new_str[0] = '!'; | |
1003 | new_str[1] = code; | |
1004 | new_str[2] = '_'; | |
1005 | new_str[3] = '_'; | |
1006 | memcpy (new_str + 4, orig_str, len); | |
1007 | XSTR (sym_ref, 0) = ggc_alloc_string (new_str, new_len); | |
df56a27f | 1008 | } |
4e08ba6c SS |
1009 | /* The non-lazy pointer list may have captured references to the |
1010 | old encoded name, change them. */ | |
b7fb9feb TC |
1011 | if (TREE_CODE (decl) == VAR_DECL) |
1012 | update_non_lazy_ptrs (XSTR (sym_ref, 0)); | |
1013 | else | |
1014 | update_stubs (XSTR (sym_ref, 0)); | |
df56a27f SS |
1015 | } |
1016 | ||
1017 | /* Scan the list of non-lazy pointers and update any recorded names whose | |
1018 | stripped name matches the argument. */ | |
1019 | ||
1020 | static void | |
1021 | update_non_lazy_ptrs (name) | |
1022 | const char *name; | |
1023 | { | |
91dc3130 | 1024 | const char *name1, *name2; |
df56a27f SS |
1025 | tree temp; |
1026 | ||
1027 | STRIP_NAME_ENCODING (name1, name); | |
1028 | ||
1029 | for (temp = machopic_non_lazy_pointers; | |
1030 | temp != NULL_TREE; | |
1031 | temp = TREE_CHAIN (temp)) | |
1032 | { | |
1033 | char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp)); | |
1034 | ||
1035 | if (*sym_name == '!') | |
1036 | { | |
1037 | STRIP_NAME_ENCODING (name2, sym_name); | |
1038 | if (strcmp (name1, name2) == 0) | |
1039 | { | |
1040 | IDENTIFIER_POINTER (TREE_VALUE (temp)) = name; | |
1041 | break; | |
1042 | } | |
1043 | } | |
1044 | } | |
1045 | } | |
4e08ba6c | 1046 | |
b7fb9feb TC |
1047 | /* Function NAME is being defined, and its label has just been output. |
1048 | If there's already a reference to a stub for this function, we can | |
1049 | just emit the stub label now and we don't bother emitting the stub later. */ | |
1050 | ||
1051 | void | |
1052 | machopic_output_possible_stub_label (file, name) | |
1053 | FILE *file; | |
1054 | const char *name; | |
1055 | { | |
1056 | tree temp; | |
1057 | ||
1058 | ||
1059 | /* Ensure we're looking at a section-encoded name. */ | |
1060 | if (name[0] != '!' || (name[1] != 't' && name[1] != 'T')) | |
1061 | return; | |
1062 | ||
1063 | for (temp = machopic_stubs; | |
1064 | temp != NULL_TREE; | |
1065 | temp = TREE_CHAIN (temp)) | |
1066 | { | |
1067 | const char *sym_name; | |
1068 | ||
1069 | sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp)); | |
1070 | if (sym_name[0] == '!' && sym_name[1] == 'T' | |
1071 | && ! strcmp (name+2, sym_name+2)) | |
1072 | { | |
1073 | ASM_OUTPUT_LABEL (file, IDENTIFIER_POINTER (TREE_PURPOSE (temp))); | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | } | |
4e08ba6c SS |
1078 | |
1079 | /* Scan the list of stubs and update any recorded names whose | |
1080 | stripped name matches the argument. */ | |
1081 | ||
1082 | static void | |
1083 | update_stubs (name) | |
1084 | const char *name; | |
1085 | { | |
91dc3130 | 1086 | const char *name1, *name2; |
4e08ba6c SS |
1087 | tree temp; |
1088 | ||
1089 | STRIP_NAME_ENCODING (name1, name); | |
1090 | ||
1091 | for (temp = machopic_stubs; | |
1092 | temp != NULL_TREE; | |
1093 | temp = TREE_CHAIN (temp)) | |
1094 | { | |
1095 | char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp)); | |
1096 | ||
1097 | if (*sym_name == '!') | |
1098 | { | |
1099 | STRIP_NAME_ENCODING (name2, sym_name); | |
1100 | if (strcmp (name1, name2) == 0) | |
1101 | { | |
1102 | IDENTIFIER_POINTER (TREE_VALUE (temp)) = name; | |
1103 | break; | |
1104 | } | |
1105 | } | |
1106 | } | |
1107 | } | |
2cc07db4 RH |
1108 | |
1109 | void | |
1110 | machopic_asm_out_constructor (symbol, priority) | |
1111 | rtx symbol; | |
1112 | int priority ATTRIBUTE_UNUSED; | |
1113 | { | |
1114 | if (flag_pic) | |
1115 | mod_init_section (); | |
1116 | else | |
1117 | constructor_section (); | |
c8af3574 RH |
1118 | assemble_align (POINTER_SIZE); |
1119 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
2cc07db4 RH |
1120 | |
1121 | if (!flag_pic) | |
1122 | fprintf (asm_out_file, ".reference .constructors_used\n"); | |
1123 | } | |
1124 | ||
1125 | void | |
1126 | machopic_asm_out_destructor (symbol, priority) | |
1127 | rtx symbol; | |
1128 | int priority ATTRIBUTE_UNUSED; | |
1129 | { | |
1130 | if (flag_pic) | |
1131 | mod_term_section (); | |
1132 | else | |
1133 | destructor_section (); | |
c8af3574 RH |
1134 | assemble_align (POINTER_SIZE); |
1135 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
2cc07db4 RH |
1136 | |
1137 | if (!flag_pic) | |
1138 | fprintf (asm_out_file, ".reference .destructors_used\n"); | |
1139 | } |