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1 | /* Functions for generic Darwin as target machine for GNU C compiler. | |
2 | Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004, | |
3 | 2005 | |
4 | Free Software Foundation, Inc. | |
5 | Contributed by Apple Computer Inc. | |
6 | ||
7 | This file is part of GCC. | |
8 | ||
9 | GCC is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2, or (at your option) | |
12 | any later version. | |
13 | ||
14 | GCC is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GCC; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "config.h" | |
25 | #include "system.h" | |
26 | #include "coretypes.h" | |
27 | #include "tm.h" | |
28 | #include "rtl.h" | |
29 | #include "regs.h" | |
30 | #include "hard-reg-set.h" | |
31 | #include "real.h" | |
32 | #include "insn-config.h" | |
33 | #include "conditions.h" | |
34 | #include "insn-flags.h" | |
35 | #include "output.h" | |
36 | #include "insn-attr.h" | |
37 | #include "flags.h" | |
38 | #include "tree.h" | |
39 | #include "expr.h" | |
40 | #include "reload.h" | |
41 | #include "function.h" | |
42 | #include "ggc.h" | |
43 | #include "langhooks.h" | |
44 | #include "target.h" | |
45 | #include "tm_p.h" | |
46 | #include "errors.h" | |
47 | #include "hashtab.h" | |
48 | ||
49 | /* Darwin supports a feature called fix-and-continue, which is used | |
50 | for rapid turn around debugging. When code is compiled with the | |
51 | -mfix-and-continue flag, two changes are made to the generated code | |
52 | that allow the system to do things that it would normally not be | |
53 | able to do easily. These changes allow gdb to load in | |
54 | recompilation of a translation unit that has been changed into a | |
55 | running program and replace existing functions and methods of that | |
56 | translation unit with with versions of those functions and methods | |
57 | from the newly compiled translation unit. The new functions access | |
58 | the existing static symbols from the old translation unit, if the | |
59 | symbol existed in the unit to be replaced, and from the new | |
60 | translation unit, otherwise. | |
61 | ||
62 | The changes are to insert 5 nops at the beginning of all functions | |
63 | and to use indirection to get at static symbols. The 5 nops | |
64 | are required by consumers of the generated code. Currently, gdb | |
65 | uses this to patch in a jump to the overriding function, this | |
66 | allows all uses of the old name to forward to the replacement, | |
67 | including existing function pointers and virtual methods. See | |
68 | rs6000_emit_prologue for the code that handles the nop insertions. | |
69 | ||
70 | The added indirection allows gdb to redirect accesses to static | |
71 | symbols from the newly loaded translation unit to the existing | |
72 | symbol, if any. @code{static} symbols are special and are handled by | |
73 | setting the second word in the .non_lazy_symbol_pointer data | |
74 | structure to symbol. See indirect_data for the code that handles | |
75 | the extra indirection, and machopic_output_indirection and its use | |
76 | of MACHO_SYMBOL_STATIC for the code that handles @code{static} | |
77 | symbol indirection. */ | |
78 | ||
79 | ||
80 | int | |
81 | name_needs_quotes (const char *name) | |
82 | { | |
83 | int c; | |
84 | while ((c = *name++) != '\0') | |
85 | if (! ISIDNUM (c) && c != '.' && c != '$') | |
86 | return 1; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | /* Return true if SYM_REF can be used without an indirection. */ | |
91 | static int | |
92 | machopic_symbol_defined_p (rtx sym_ref) | |
93 | { | |
94 | if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED) | |
95 | return true; | |
96 | ||
97 | /* If a symbol references local and is not an extern to this | |
98 | file, then the symbol might be able to declared as defined. */ | |
99 | if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref)) | |
100 | { | |
101 | /* If the symbol references a variable and the variable is a | |
102 | common symbol, then this symbol is not defined. */ | |
103 | if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE) | |
104 | { | |
105 | tree decl = SYMBOL_REF_DECL (sym_ref); | |
106 | if (!decl) | |
107 | return true; | |
108 | if (DECL_COMMON (decl)) | |
109 | return false; | |
110 | } | |
111 | return true; | |
112 | } | |
113 | return false; | |
114 | } | |
115 | ||
116 | /* This module assumes that (const (symbol_ref "foo")) is a legal pic | |
117 | reference, which will not be changed. */ | |
118 | ||
119 | enum machopic_addr_class | |
120 | machopic_classify_symbol (rtx sym_ref) | |
121 | { | |
122 | int flags; | |
123 | bool function_p; | |
124 | ||
125 | flags = SYMBOL_REF_FLAGS (sym_ref); | |
126 | function_p = SYMBOL_REF_FUNCTION_P (sym_ref); | |
127 | if (machopic_symbol_defined_p (sym_ref)) | |
128 | return (function_p | |
129 | ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA); | |
130 | else | |
131 | return (function_p | |
132 | ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA); | |
133 | } | |
134 | ||
135 | #ifndef TARGET_FIX_AND_CONTINUE | |
136 | #define TARGET_FIX_AND_CONTINUE 0 | |
137 | #endif | |
138 | ||
139 | /* Indicate when fix-and-continue style code generation is being used | |
140 | and when a reference to data should be indirected so that it can be | |
141 | rebound in a new translation unit to reference the original instance | |
142 | of that data. Symbol names that are for code generation local to | |
143 | the translation unit are bound to the new translation unit; | |
144 | currently this means symbols that begin with L or _OBJC_; | |
145 | otherwise, we indicate that an indirect reference should be made to | |
146 | permit the runtime to rebind new instances of the translation unit | |
147 | to the original instance of the data. */ | |
148 | ||
149 | static int | |
150 | indirect_data (rtx sym_ref) | |
151 | { | |
152 | int lprefix; | |
153 | const char *name; | |
154 | ||
155 | /* If we aren't generating fix-and-continue code, don't do anything special. */ | |
156 | if (TARGET_FIX_AND_CONTINUE == 0) | |
157 | return 0; | |
158 | ||
159 | /* Otherwise, all symbol except symbols that begin with L or _OBJC_ | |
160 | are indirected. Symbols that begin with L and _OBJC_ are always | |
161 | bound to the current translation unit as they are used for | |
162 | generated local data of the translation unit. */ | |
163 | ||
164 | name = XSTR (sym_ref, 0); | |
165 | ||
166 | lprefix = (((name[0] == '*' || name[0] == '&') | |
167 | && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L'))) | |
168 | || (strncmp (name, "_OBJC_", 6) == 0)); | |
169 | ||
170 | return ! lprefix; | |
171 | } | |
172 | ||
173 | ||
174 | static int | |
175 | machopic_data_defined_p (rtx sym_ref) | |
176 | { | |
177 | if (indirect_data (sym_ref)) | |
178 | return 0; | |
179 | ||
180 | switch (machopic_classify_symbol (sym_ref)) | |
181 | { | |
182 | case MACHOPIC_DEFINED_DATA: | |
183 | case MACHOPIC_DEFINED_FUNCTION: | |
184 | return 1; | |
185 | default: | |
186 | return 0; | |
187 | } | |
188 | } | |
189 | ||
190 | void | |
191 | machopic_define_symbol (rtx mem) | |
192 | { | |
193 | rtx sym_ref; | |
194 | if (GET_CODE (mem) != MEM) | |
195 | abort (); | |
196 | sym_ref = XEXP (mem, 0); | |
197 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; | |
198 | } | |
199 | ||
200 | static GTY(()) char * function_base; | |
201 | ||
202 | const char * | |
203 | machopic_function_base_name (void) | |
204 | { | |
205 | /* if dynamic-no-pic is on, we should not get here */ | |
206 | if (MACHO_DYNAMIC_NO_PIC_P) | |
207 | abort (); | |
208 | ||
209 | if (function_base == NULL) | |
210 | function_base = | |
211 | (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>")); | |
212 | ||
213 | current_function_uses_pic_offset_table = 1; | |
214 | ||
215 | return function_base; | |
216 | } | |
217 | ||
218 | /* Return a SYMBOL_REF for the PIC function base. */ | |
219 | ||
220 | rtx | |
221 | machopic_function_base_sym (void) | |
222 | { | |
223 | rtx sym_ref; | |
224 | ||
225 | sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ()); | |
226 | SYMBOL_REF_FLAGS (sym_ref) | |
227 | |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED); | |
228 | return sym_ref; | |
229 | } | |
230 | ||
231 | static GTY(()) const char * function_base_func_name; | |
232 | static GTY(()) int current_pic_label_num; | |
233 | ||
234 | void | |
235 | machopic_output_function_base_name (FILE *file) | |
236 | { | |
237 | const char *current_name; | |
238 | ||
239 | /* If dynamic-no-pic is on, we should not get here. */ | |
240 | if (MACHO_DYNAMIC_NO_PIC_P) | |
241 | abort (); | |
242 | current_name = | |
243 | IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); | |
244 | if (function_base_func_name != current_name) | |
245 | { | |
246 | ++current_pic_label_num; | |
247 | function_base_func_name = current_name; | |
248 | } | |
249 | fprintf (file, "\"L%011d$pb\"", current_pic_label_num); | |
250 | } | |
251 | ||
252 | /* The suffix attached to non-lazy pointer symbols. */ | |
253 | #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr" | |
254 | /* The suffix attached to stub symbols. */ | |
255 | #define STUB_SUFFIX "$stub" | |
256 | ||
257 | typedef struct machopic_indirection GTY (()) | |
258 | { | |
259 | /* The SYMBOL_REF for the entity referenced. */ | |
260 | rtx symbol; | |
261 | /* The name of the stub or non-lazy pointer. */ | |
262 | const char * ptr_name; | |
263 | /* True iff this entry is for a stub (as opposed to a non-lazy | |
264 | pointer). */ | |
265 | bool stub_p; | |
266 | /* True iff this stub or pointer pointer has been referenced. */ | |
267 | bool used; | |
268 | } machopic_indirection; | |
269 | ||
270 | /* A table mapping stub names and non-lazy pointer names to | |
271 | SYMBOL_REFs for the stubbed-to and pointed-to entities. */ | |
272 | ||
273 | static GTY ((param_is (struct machopic_indirection))) htab_t | |
274 | machopic_indirections; | |
275 | ||
276 | /* Return a hash value for a SLOT in the indirections hash table. */ | |
277 | ||
278 | static hashval_t | |
279 | machopic_indirection_hash (const void *slot) | |
280 | { | |
281 | const machopic_indirection *p = (const machopic_indirection *) slot; | |
282 | return htab_hash_string (p->ptr_name); | |
283 | } | |
284 | ||
285 | /* Returns true if the KEY is the same as that associated with | |
286 | SLOT. */ | |
287 | ||
288 | static int | |
289 | machopic_indirection_eq (const void *slot, const void *key) | |
290 | { | |
291 | return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0; | |
292 | } | |
293 | ||
294 | /* Return the name of the non-lazy pointer (if STUB_P is false) or | |
295 | stub (if STUB_B is true) corresponding to the given name. */ | |
296 | ||
297 | const char * | |
298 | machopic_indirection_name (rtx sym_ref, bool stub_p) | |
299 | { | |
300 | char *buffer; | |
301 | const char *name = XSTR (sym_ref, 0); | |
302 | size_t namelen = strlen (name); | |
303 | machopic_indirection *p; | |
304 | void ** slot; | |
305 | bool saw_star = false; | |
306 | bool needs_quotes; | |
307 | const char *suffix; | |
308 | const char *prefix = user_label_prefix; | |
309 | const char *quote = ""; | |
310 | ||
311 | if (name[0] == '*') | |
312 | { | |
313 | saw_star = true; | |
314 | prefix = ""; | |
315 | ++name; | |
316 | --namelen; | |
317 | } | |
318 | ||
319 | needs_quotes = name_needs_quotes (name); | |
320 | if (needs_quotes) | |
321 | { | |
322 | quote = "\""; | |
323 | } | |
324 | ||
325 | if (stub_p) | |
326 | suffix = STUB_SUFFIX; | |
327 | else | |
328 | suffix = NON_LAZY_POINTER_SUFFIX; | |
329 | ||
330 | buffer = alloca (strlen ("&L") | |
331 | + strlen (prefix) | |
332 | + namelen | |
333 | + strlen (suffix) | |
334 | + 2 * strlen (quote) | |
335 | + 1 /* '\0' */); | |
336 | ||
337 | /* Construct the name of the non-lazy pointer or stub. */ | |
338 | sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote); | |
339 | ||
340 | if (!machopic_indirections) | |
341 | machopic_indirections = htab_create_ggc (37, | |
342 | machopic_indirection_hash, | |
343 | machopic_indirection_eq, | |
344 | /*htab_del=*/NULL); | |
345 | ||
346 | slot = htab_find_slot_with_hash (machopic_indirections, buffer, | |
347 | htab_hash_string (buffer), INSERT); | |
348 | if (*slot) | |
349 | { | |
350 | p = (machopic_indirection *) *slot; | |
351 | } | |
352 | else | |
353 | { | |
354 | p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection)); | |
355 | p->symbol = sym_ref; | |
356 | p->ptr_name = xstrdup (buffer); | |
357 | p->stub_p = stub_p; | |
358 | p->used = false; | |
359 | *slot = p; | |
360 | } | |
361 | ||
362 | return p->ptr_name; | |
363 | } | |
364 | ||
365 | /* Return the name of the stub for the mcount function. */ | |
366 | ||
367 | const char* | |
368 | machopic_mcount_stub_name (void) | |
369 | { | |
370 | rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount"); | |
371 | return machopic_indirection_name (symbol, /*stub_p=*/true); | |
372 | } | |
373 | ||
374 | /* If NAME is the name of a stub or a non-lazy pointer , mark the stub | |
375 | or non-lazy pointer as used -- and mark the object to which the | |
376 | pointer/stub refers as used as well, since the pointer/stub will | |
377 | emit a reference to it. */ | |
378 | ||
379 | void | |
380 | machopic_validate_stub_or_non_lazy_ptr (const char *name) | |
381 | { | |
382 | machopic_indirection *p; | |
383 | ||
384 | p = ((machopic_indirection *) | |
385 | (htab_find_with_hash (machopic_indirections, name, | |
386 | htab_hash_string (name)))); | |
387 | if (p && ! p->used) | |
388 | { | |
389 | const char *real_name; | |
390 | tree id; | |
391 | ||
392 | p->used = true; | |
393 | ||
394 | /* Do what output_addr_const will do when we actually call it. */ | |
395 | if (SYMBOL_REF_DECL (p->symbol)) | |
396 | mark_decl_referenced (SYMBOL_REF_DECL (p->symbol)); | |
397 | ||
398 | real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0)); | |
399 | ||
400 | id = maybe_get_identifier (real_name); | |
401 | if (id) | |
402 | mark_referenced (id); | |
403 | } | |
404 | } | |
405 | ||
406 | /* Transform ORIG, which may be any data source, to the corresponding | |
407 | source using indirections. */ | |
408 | ||
409 | rtx | |
410 | machopic_indirect_data_reference (rtx orig, rtx reg) | |
411 | { | |
412 | rtx ptr_ref = orig; | |
413 | ||
414 | if (! MACHOPIC_INDIRECT) | |
415 | return orig; | |
416 | ||
417 | if (GET_CODE (orig) == SYMBOL_REF) | |
418 | { | |
419 | int defined = machopic_data_defined_p (orig); | |
420 | ||
421 | if (defined && MACHO_DYNAMIC_NO_PIC_P) | |
422 | { | |
423 | #if defined (TARGET_TOC) | |
424 | emit_insn (gen_macho_high (reg, orig)); | |
425 | emit_insn (gen_macho_low (reg, reg, orig)); | |
426 | #else | |
427 | /* some other cpu -- writeme! */ | |
428 | abort (); | |
429 | #endif | |
430 | return reg; | |
431 | } | |
432 | else if (defined) | |
433 | { | |
434 | #if defined (TARGET_TOC) || defined (HAVE_lo_sum) | |
435 | rtx pic_base = machopic_function_base_sym (); | |
436 | rtx offset = gen_rtx_CONST (Pmode, | |
437 | gen_rtx_MINUS (Pmode, orig, pic_base)); | |
438 | #endif | |
439 | ||
440 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
441 | rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode)); | |
442 | ||
443 | if (reg == NULL) | |
444 | abort (); | |
445 | ||
446 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, | |
447 | gen_rtx_PLUS (Pmode, pic_offset_table_rtx, | |
448 | gen_rtx_HIGH (Pmode, offset)))); | |
449 | emit_insn (gen_rtx_SET (Pmode, reg, | |
450 | gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset))); | |
451 | ||
452 | orig = reg; | |
453 | #else | |
454 | #if defined (HAVE_lo_sum) | |
455 | if (reg == 0) abort (); | |
456 | ||
457 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
458 | gen_rtx_HIGH (Pmode, offset))); | |
459 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
460 | gen_rtx_LO_SUM (Pmode, reg, offset))); | |
461 | emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx)); | |
462 | ||
463 | orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg); | |
464 | #endif | |
465 | #endif | |
466 | return orig; | |
467 | } | |
468 | ||
469 | ptr_ref = (gen_rtx_SYMBOL_REF | |
470 | (Pmode, | |
471 | machopic_indirection_name (orig, /*stub_p=*/false))); | |
472 | ||
473 | SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig); | |
474 | ||
475 | ptr_ref = gen_const_mem (Pmode, ptr_ref); | |
476 | machopic_define_symbol (ptr_ref); | |
477 | ||
478 | return ptr_ref; | |
479 | } | |
480 | else if (GET_CODE (orig) == CONST) | |
481 | { | |
482 | rtx base, result; | |
483 | ||
484 | /* legitimize both operands of the PLUS */ | |
485 | if (GET_CODE (XEXP (orig, 0)) == PLUS) | |
486 | { | |
487 | base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0), | |
488 | reg); | |
489 | orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1), | |
490 | (base == reg ? 0 : reg)); | |
491 | } | |
492 | else | |
493 | return orig; | |
494 | ||
495 | if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT) | |
496 | result = plus_constant (base, INTVAL (orig)); | |
497 | else | |
498 | result = gen_rtx_PLUS (Pmode, base, orig); | |
499 | ||
500 | if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM) | |
501 | { | |
502 | if (reg) | |
503 | { | |
504 | emit_move_insn (reg, result); | |
505 | result = reg; | |
506 | } | |
507 | else | |
508 | { | |
509 | result = force_reg (GET_MODE (result), result); | |
510 | } | |
511 | } | |
512 | ||
513 | return result; | |
514 | ||
515 | } | |
516 | else if (GET_CODE (orig) == MEM) | |
517 | XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg); | |
518 | /* When the target is i386, this code prevents crashes due to the | |
519 | compiler's ignorance on how to move the PIC base register to | |
520 | other registers. (The reload phase sometimes introduces such | |
521 | insns.) */ | |
522 | else if (GET_CODE (orig) == PLUS | |
523 | && GET_CODE (XEXP (orig, 0)) == REG | |
524 | && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM | |
525 | #ifdef I386 | |
526 | /* Prevent the same register from being erroneously used | |
527 | as both the base and index registers. */ | |
528 | && GET_CODE (XEXP (orig, 1)) == CONST | |
529 | #endif | |
530 | && reg) | |
531 | { | |
532 | emit_move_insn (reg, XEXP (orig, 0)); | |
533 | XEXP (ptr_ref, 0) = reg; | |
534 | } | |
535 | return ptr_ref; | |
536 | } | |
537 | ||
538 | /* Transform TARGET (a MEM), which is a function call target, to the | |
539 | corresponding symbol_stub if necessary. Return a new MEM. */ | |
540 | ||
541 | rtx | |
542 | machopic_indirect_call_target (rtx target) | |
543 | { | |
544 | if (GET_CODE (target) != MEM) | |
545 | return target; | |
546 | ||
547 | if (MACHOPIC_INDIRECT | |
548 | && GET_CODE (XEXP (target, 0)) == SYMBOL_REF | |
549 | && !(SYMBOL_REF_FLAGS (XEXP (target, 0)) | |
550 | & MACHO_SYMBOL_FLAG_DEFINED)) | |
551 | { | |
552 | rtx sym_ref = XEXP (target, 0); | |
553 | const char *stub_name = machopic_indirection_name (sym_ref, | |
554 | /*stub_p=*/true); | |
555 | enum machine_mode mode = GET_MODE (sym_ref); | |
556 | tree decl = SYMBOL_REF_DECL (sym_ref); | |
557 | ||
558 | XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name); | |
559 | SYMBOL_REF_DECL (XEXP (target, 0)) = decl; | |
560 | MEM_READONLY_P (target) = 1; | |
561 | MEM_NOTRAP_P (target) = 1; | |
562 | } | |
563 | ||
564 | return target; | |
565 | } | |
566 | ||
567 | rtx | |
568 | machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) | |
569 | { | |
570 | rtx pic_ref = orig; | |
571 | ||
572 | if (! MACHOPIC_INDIRECT) | |
573 | return orig; | |
574 | ||
575 | /* First handle a simple SYMBOL_REF or LABEL_REF */ | |
576 | if (GET_CODE (orig) == LABEL_REF | |
577 | || (GET_CODE (orig) == SYMBOL_REF | |
578 | )) | |
579 | { | |
580 | /* addr(foo) = &func+(foo-func) */ | |
581 | rtx pic_base; | |
582 | ||
583 | orig = machopic_indirect_data_reference (orig, reg); | |
584 | ||
585 | if (GET_CODE (orig) == PLUS | |
586 | && GET_CODE (XEXP (orig, 0)) == REG) | |
587 | { | |
588 | if (reg == 0) | |
589 | return force_reg (mode, orig); | |
590 | ||
591 | emit_move_insn (reg, orig); | |
592 | return reg; | |
593 | } | |
594 | ||
595 | /* if dynamic-no-pic then use 0 as the pic base */ | |
596 | if (MACHO_DYNAMIC_NO_PIC_P) | |
597 | pic_base = CONST0_RTX (Pmode); | |
598 | else | |
599 | pic_base = machopic_function_base_sym (); | |
600 | ||
601 | if (GET_CODE (orig) == MEM) | |
602 | { | |
603 | if (reg == 0) | |
604 | { | |
605 | if (reload_in_progress) | |
606 | abort (); | |
607 | else | |
608 | reg = gen_reg_rtx (Pmode); | |
609 | } | |
610 | ||
611 | #ifdef HAVE_lo_sum | |
612 | if (MACHO_DYNAMIC_NO_PIC_P | |
613 | && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
614 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF)) | |
615 | { | |
616 | #if defined (TARGET_TOC) /* ppc */ | |
617 | rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode); | |
618 | rtx asym = XEXP (orig, 0); | |
619 | rtx mem; | |
620 | ||
621 | emit_insn (gen_macho_high (temp_reg, asym)); | |
622 | mem = gen_const_mem (GET_MODE (orig), | |
623 | gen_rtx_LO_SUM (Pmode, temp_reg, asym)); | |
624 | emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); | |
625 | #else | |
626 | /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */ | |
627 | abort (); | |
628 | #endif | |
629 | pic_ref = reg; | |
630 | } | |
631 | else | |
632 | if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
633 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
634 | { | |
635 | rtx offset = gen_rtx_CONST (Pmode, | |
636 | gen_rtx_MINUS (Pmode, | |
637 | XEXP (orig, 0), | |
638 | pic_base)); | |
639 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
640 | /* Generating a new reg may expose opportunities for | |
641 | common subexpression elimination. */ | |
642 | rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode); | |
643 | rtx mem; | |
644 | rtx insn; | |
645 | rtx sum; | |
646 | ||
647 | sum = gen_rtx_HIGH (Pmode, offset); | |
648 | if (! MACHO_DYNAMIC_NO_PIC_P) | |
649 | sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum); | |
650 | ||
651 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum)); | |
652 | ||
653 | mem = gen_const_mem (GET_MODE (orig), | |
654 | gen_rtx_LO_SUM (Pmode, | |
655 | hi_sum_reg, offset)); | |
656 | insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); | |
657 | REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref, | |
658 | REG_NOTES (insn)); | |
659 | ||
660 | pic_ref = reg; | |
661 | #else | |
662 | emit_insn (gen_rtx_USE (VOIDmode, | |
663 | gen_rtx_REG (Pmode, | |
664 | PIC_OFFSET_TABLE_REGNUM))); | |
665 | ||
666 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
667 | gen_rtx_HIGH (Pmode, | |
668 | gen_rtx_CONST (Pmode, | |
669 | offset)))); | |
670 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
671 | gen_rtx_LO_SUM (Pmode, reg, | |
672 | gen_rtx_CONST (Pmode, offset)))); | |
673 | pic_ref = gen_rtx_PLUS (Pmode, | |
674 | pic_offset_table_rtx, reg); | |
675 | #endif | |
676 | } | |
677 | else | |
678 | #endif /* HAVE_lo_sum */ | |
679 | { | |
680 | rtx pic = pic_offset_table_rtx; | |
681 | if (GET_CODE (pic) != REG) | |
682 | { | |
683 | emit_move_insn (reg, pic); | |
684 | pic = reg; | |
685 | } | |
686 | #if 0 | |
687 | emit_insn (gen_rtx_USE (VOIDmode, | |
688 | gen_rtx_REG (Pmode, | |
689 | PIC_OFFSET_TABLE_REGNUM))); | |
690 | #endif | |
691 | ||
692 | pic_ref = gen_rtx_PLUS (Pmode, | |
693 | pic, | |
694 | gen_rtx_CONST (Pmode, | |
695 | gen_rtx_MINUS (Pmode, | |
696 | XEXP (orig, 0), | |
697 | pic_base))); | |
698 | } | |
699 | ||
700 | #if !defined (TARGET_TOC) | |
701 | emit_move_insn (reg, pic_ref); | |
702 | pic_ref = gen_const_mem (GET_MODE (orig), reg); | |
703 | #endif | |
704 | } | |
705 | else | |
706 | { | |
707 | ||
708 | #ifdef HAVE_lo_sum | |
709 | if (GET_CODE (orig) == SYMBOL_REF | |
710 | || GET_CODE (orig) == LABEL_REF) | |
711 | { | |
712 | rtx offset = gen_rtx_CONST (Pmode, | |
713 | gen_rtx_MINUS (Pmode, | |
714 | orig, pic_base)); | |
715 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
716 | rtx hi_sum_reg; | |
717 | ||
718 | if (reg == 0) | |
719 | { | |
720 | if (reload_in_progress) | |
721 | abort (); | |
722 | else | |
723 | reg = gen_reg_rtx (Pmode); | |
724 | } | |
725 | ||
726 | hi_sum_reg = reg; | |
727 | ||
728 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, | |
729 | (MACHO_DYNAMIC_NO_PIC_P) | |
730 | ? gen_rtx_HIGH (Pmode, offset) | |
731 | : gen_rtx_PLUS (Pmode, | |
732 | pic_offset_table_rtx, | |
733 | gen_rtx_HIGH (Pmode, | |
734 | offset)))); | |
735 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
736 | gen_rtx_LO_SUM (Pmode, | |
737 | hi_sum_reg, offset))); | |
738 | pic_ref = reg; | |
739 | #else | |
740 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
741 | gen_rtx_HIGH (Pmode, offset))); | |
742 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
743 | gen_rtx_LO_SUM (Pmode, reg, offset))); | |
744 | pic_ref = gen_rtx_PLUS (Pmode, | |
745 | pic_offset_table_rtx, reg); | |
746 | #endif | |
747 | } | |
748 | else | |
749 | #endif /* HAVE_lo_sum */ | |
750 | { | |
751 | if (REG_P (orig) | |
752 | || GET_CODE (orig) == SUBREG) | |
753 | { | |
754 | return orig; | |
755 | } | |
756 | else | |
757 | { | |
758 | rtx pic = pic_offset_table_rtx; | |
759 | if (GET_CODE (pic) != REG) | |
760 | { | |
761 | emit_move_insn (reg, pic); | |
762 | pic = reg; | |
763 | } | |
764 | #if 0 | |
765 | emit_insn (gen_rtx_USE (VOIDmode, | |
766 | pic_offset_table_rtx)); | |
767 | #endif | |
768 | pic_ref = gen_rtx_PLUS (Pmode, | |
769 | pic, | |
770 | gen_rtx_CONST (Pmode, | |
771 | gen_rtx_MINUS (Pmode, | |
772 | orig, pic_base))); | |
773 | } | |
774 | } | |
775 | } | |
776 | ||
777 | if (GET_CODE (pic_ref) != REG) | |
778 | { | |
779 | if (reg != 0) | |
780 | { | |
781 | emit_move_insn (reg, pic_ref); | |
782 | return reg; | |
783 | } | |
784 | else | |
785 | { | |
786 | return force_reg (mode, pic_ref); | |
787 | } | |
788 | } | |
789 | else | |
790 | { | |
791 | return pic_ref; | |
792 | } | |
793 | } | |
794 | ||
795 | else if (GET_CODE (orig) == SYMBOL_REF) | |
796 | return orig; | |
797 | ||
798 | else if (GET_CODE (orig) == PLUS | |
799 | && (GET_CODE (XEXP (orig, 0)) == MEM | |
800 | || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
801 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
802 | && XEXP (orig, 0) != pic_offset_table_rtx | |
803 | && GET_CODE (XEXP (orig, 1)) != REG) | |
804 | ||
805 | { | |
806 | rtx base; | |
807 | int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM); | |
808 | ||
809 | base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
810 | orig = machopic_legitimize_pic_address (XEXP (orig, 1), | |
811 | Pmode, (base == reg ? 0 : reg)); | |
812 | if (GET_CODE (orig) == CONST_INT) | |
813 | { | |
814 | pic_ref = plus_constant (base, INTVAL (orig)); | |
815 | is_complex = 1; | |
816 | } | |
817 | else | |
818 | pic_ref = gen_rtx_PLUS (Pmode, base, orig); | |
819 | ||
820 | if (reg && is_complex) | |
821 | { | |
822 | emit_move_insn (reg, pic_ref); | |
823 | pic_ref = reg; | |
824 | } | |
825 | /* Likewise, should we set special REG_NOTEs here? */ | |
826 | } | |
827 | ||
828 | else if (GET_CODE (orig) == CONST) | |
829 | { | |
830 | return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
831 | } | |
832 | ||
833 | else if (GET_CODE (orig) == MEM | |
834 | && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF) | |
835 | { | |
836 | rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
837 | addr = replace_equiv_address (orig, addr); | |
838 | emit_move_insn (reg, addr); | |
839 | pic_ref = reg; | |
840 | } | |
841 | ||
842 | return pic_ref; | |
843 | } | |
844 | ||
845 | /* Output the stub or non-lazy pointer in *SLOT, if it has been used. | |
846 | DATA is the FILE* for assembly output. Called from | |
847 | htab_traverse. */ | |
848 | ||
849 | static int | |
850 | machopic_output_indirection (void **slot, void *data) | |
851 | { | |
852 | machopic_indirection *p = *((machopic_indirection **) slot); | |
853 | FILE *asm_out_file = (FILE *) data; | |
854 | rtx symbol; | |
855 | const char *sym_name; | |
856 | const char *ptr_name; | |
857 | ||
858 | if (!p->used) | |
859 | return 1; | |
860 | ||
861 | symbol = p->symbol; | |
862 | sym_name = XSTR (symbol, 0); | |
863 | ptr_name = p->ptr_name; | |
864 | ||
865 | if (p->stub_p) | |
866 | { | |
867 | char *sym; | |
868 | char *stub; | |
869 | ||
870 | sym = alloca (strlen (sym_name) + 2); | |
871 | if (sym_name[0] == '*' || sym_name[0] == '&') | |
872 | strcpy (sym, sym_name + 1); | |
873 | else if (sym_name[0] == '-' || sym_name[0] == '+') | |
874 | strcpy (sym, sym_name); | |
875 | else | |
876 | sprintf (sym, "%s%s", user_label_prefix, sym_name); | |
877 | ||
878 | stub = alloca (strlen (ptr_name) + 2); | |
879 | if (ptr_name[0] == '*' || ptr_name[0] == '&') | |
880 | strcpy (stub, ptr_name + 1); | |
881 | else | |
882 | sprintf (stub, "%s%s", user_label_prefix, ptr_name); | |
883 | ||
884 | machopic_output_stub (asm_out_file, sym, stub); | |
885 | } | |
886 | else if (! indirect_data (symbol) | |
887 | && (machopic_symbol_defined_p (symbol) | |
888 | || SYMBOL_REF_LOCAL_P (symbol))) | |
889 | { | |
890 | data_section (); | |
891 | assemble_align (GET_MODE_ALIGNMENT (Pmode)); | |
892 | assemble_label (ptr_name); | |
893 | assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name), | |
894 | GET_MODE_SIZE (Pmode), | |
895 | GET_MODE_ALIGNMENT (Pmode), 1); | |
896 | } | |
897 | else | |
898 | { | |
899 | rtx init = const0_rtx; | |
900 | ||
901 | machopic_nl_symbol_ptr_section (); | |
902 | assemble_name (asm_out_file, ptr_name); | |
903 | fprintf (asm_out_file, ":\n"); | |
904 | ||
905 | fprintf (asm_out_file, "\t.indirect_symbol "); | |
906 | assemble_name (asm_out_file, sym_name); | |
907 | fprintf (asm_out_file, "\n"); | |
908 | ||
909 | /* Variables that are marked with MACHO_SYMBOL_STATIC need to | |
910 | have their symbol name instead of 0 in the second entry of | |
911 | the non-lazy symbol pointer data structure when they are | |
912 | defined. This allows the runtime to rebind newer instances | |
913 | of the translation unit with the original instance of the | |
914 | symbol. */ | |
915 | ||
916 | if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC) | |
917 | && machopic_symbol_defined_p (symbol)) | |
918 | init = gen_rtx_SYMBOL_REF (Pmode, sym_name); | |
919 | ||
920 | assemble_integer (init, GET_MODE_SIZE (Pmode), | |
921 | GET_MODE_ALIGNMENT (Pmode), 1); | |
922 | } | |
923 | ||
924 | return 1; | |
925 | } | |
926 | ||
927 | void | |
928 | machopic_finish (FILE *asm_out_file) | |
929 | { | |
930 | if (machopic_indirections) | |
931 | htab_traverse_noresize (machopic_indirections, | |
932 | machopic_output_indirection, | |
933 | asm_out_file); | |
934 | } | |
935 | ||
936 | int | |
937 | machopic_operand_p (rtx op) | |
938 | { | |
939 | if (MACHOPIC_JUST_INDIRECT) | |
940 | { | |
941 | while (GET_CODE (op) == CONST) | |
942 | op = XEXP (op, 0); | |
943 | ||
944 | if (GET_CODE (op) == SYMBOL_REF) | |
945 | return machopic_symbol_defined_p (op); | |
946 | else | |
947 | return 0; | |
948 | } | |
949 | ||
950 | while (GET_CODE (op) == CONST) | |
951 | op = XEXP (op, 0); | |
952 | ||
953 | if (GET_CODE (op) == MINUS | |
954 | && GET_CODE (XEXP (op, 0)) == SYMBOL_REF | |
955 | && GET_CODE (XEXP (op, 1)) == SYMBOL_REF | |
956 | && machopic_symbol_defined_p (XEXP (op, 0)) | |
957 | && machopic_symbol_defined_p (XEXP (op, 1))) | |
958 | return 1; | |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
963 | /* This function records whether a given name corresponds to a defined | |
964 | or undefined function or variable, for machopic_classify_ident to | |
965 | use later. */ | |
966 | ||
967 | void | |
968 | darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED) | |
969 | { | |
970 | rtx sym_ref; | |
971 | ||
972 | /* Do the standard encoding things first. */ | |
973 | default_encode_section_info (decl, rtl, first); | |
974 | ||
975 | if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL) | |
976 | return; | |
977 | ||
978 | sym_ref = XEXP (rtl, 0); | |
979 | if (TREE_CODE (decl) == VAR_DECL) | |
980 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE; | |
981 | ||
982 | if (!DECL_EXTERNAL (decl) | |
983 | && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl)) | |
984 | && ((TREE_STATIC (decl) | |
985 | && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl))) | |
986 | || (!DECL_COMMON (decl) && DECL_INITIAL (decl) | |
987 | && DECL_INITIAL (decl) != error_mark_node))) | |
988 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; | |
989 | ||
990 | if (! TREE_PUBLIC (decl)) | |
991 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC; | |
992 | } | |
993 | ||
994 | void | |
995 | darwin_mark_decl_preserved (const char *name) | |
996 | { | |
997 | fprintf (asm_out_file, ".no_dead_strip "); | |
998 | assemble_name (asm_out_file, name); | |
999 | fputc ('\n', asm_out_file); | |
1000 | } | |
1001 | ||
1002 | void | |
1003 | machopic_select_section (tree exp, int reloc, | |
1004 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) | |
1005 | { | |
1006 | void (*base_function)(void); | |
1007 | bool weak_p = DECL_P (exp) && DECL_WEAK (exp); | |
1008 | static void (* const base_funs[][2])(void) = { | |
1009 | { text_section, text_coal_section }, | |
1010 | { unlikely_text_section, text_unlikely_coal_section }, | |
1011 | { readonly_data_section, const_coal_section }, | |
1012 | { const_data_section, const_data_coal_section }, | |
1013 | { data_section, data_coal_section } | |
1014 | }; | |
1015 | ||
1016 | if (reloc == 0 | |
1017 | && (last_text_section == in_text_unlikely | |
1018 | || last_text_section == in_text_unlikely_coal)) | |
1019 | reloc = 1; | |
1020 | ||
1021 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
1022 | base_function = base_funs[reloc][weak_p]; | |
1023 | else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT)) | |
1024 | base_function = base_funs[2][weak_p]; | |
1025 | else if (TREE_READONLY (exp) || TREE_CONSTANT (exp)) | |
1026 | base_function = base_funs[3][weak_p]; | |
1027 | else | |
1028 | base_function = base_funs[4][weak_p]; | |
1029 | ||
1030 | if (TREE_CODE (exp) == STRING_CST | |
1031 | && ((size_t) TREE_STRING_LENGTH (exp) | |
1032 | == strlen (TREE_STRING_POINTER (exp)) + 1)) | |
1033 | cstring_section (); | |
1034 | else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST) | |
1035 | && flag_merge_constants) | |
1036 | { | |
1037 | tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp)); | |
1038 | ||
1039 | if (TREE_CODE (size) == INTEGER_CST && | |
1040 | TREE_INT_CST_LOW (size) == 4 && | |
1041 | TREE_INT_CST_HIGH (size) == 0) | |
1042 | literal4_section (); | |
1043 | else if (TREE_CODE (size) == INTEGER_CST && | |
1044 | TREE_INT_CST_LOW (size) == 8 && | |
1045 | TREE_INT_CST_HIGH (size) == 0) | |
1046 | literal8_section (); | |
1047 | else | |
1048 | base_function (); | |
1049 | } | |
1050 | else if (TREE_CODE (exp) == CONSTRUCTOR | |
1051 | && TREE_TYPE (exp) | |
1052 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
1053 | && TYPE_NAME (TREE_TYPE (exp))) | |
1054 | { | |
1055 | tree name = TYPE_NAME (TREE_TYPE (exp)); | |
1056 | if (TREE_CODE (name) == TYPE_DECL) | |
1057 | name = DECL_NAME (name); | |
1058 | if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString")) | |
1059 | objc_constant_string_object_section (); | |
1060 | else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString")) | |
1061 | objc_string_object_section (); | |
1062 | else | |
1063 | base_function (); | |
1064 | } | |
1065 | else if (TREE_CODE (exp) == VAR_DECL && | |
1066 | DECL_NAME (exp) && | |
1067 | TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE && | |
1068 | IDENTIFIER_POINTER (DECL_NAME (exp)) && | |
1069 | !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6)) | |
1070 | { | |
1071 | const char *name = IDENTIFIER_POINTER (DECL_NAME (exp)); | |
1072 | ||
1073 | if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20)) | |
1074 | objc_cls_meth_section (); | |
1075 | else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23)) | |
1076 | objc_inst_meth_section (); | |
1077 | else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20)) | |
1078 | objc_cat_cls_meth_section (); | |
1079 | else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23)) | |
1080 | objc_cat_inst_meth_section (); | |
1081 | else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22)) | |
1082 | objc_class_vars_section (); | |
1083 | else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25)) | |
1084 | objc_instance_vars_section (); | |
1085 | else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22)) | |
1086 | objc_cat_cls_meth_section (); | |
1087 | else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17)) | |
1088 | objc_class_names_section (); | |
1089 | else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20)) | |
1090 | objc_meth_var_names_section (); | |
1091 | else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20)) | |
1092 | objc_meth_var_types_section (); | |
1093 | else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22)) | |
1094 | objc_cls_refs_section (); | |
1095 | else if (!strncmp (name, "_OBJC_CLASS_", 12)) | |
1096 | objc_class_section (); | |
1097 | else if (!strncmp (name, "_OBJC_METACLASS_", 16)) | |
1098 | objc_meta_class_section (); | |
1099 | else if (!strncmp (name, "_OBJC_CATEGORY_", 15)) | |
1100 | objc_category_section (); | |
1101 | else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25)) | |
1102 | objc_selector_refs_section (); | |
1103 | else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20)) | |
1104 | objc_selector_fixup_section (); | |
1105 | else if (!strncmp (name, "_OBJC_SYMBOLS", 13)) | |
1106 | objc_symbols_section (); | |
1107 | else if (!strncmp (name, "_OBJC_MODULES", 13)) | |
1108 | objc_module_info_section (); | |
1109 | else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16)) | |
1110 | objc_image_info_section (); | |
1111 | else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) | |
1112 | objc_cat_inst_meth_section (); | |
1113 | else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) | |
1114 | objc_cat_cls_meth_section (); | |
1115 | else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20)) | |
1116 | objc_cat_cls_meth_section (); | |
1117 | else if (!strncmp (name, "_OBJC_PROTOCOL_", 15)) | |
1118 | objc_protocol_section (); | |
1119 | else | |
1120 | base_function (); | |
1121 | } | |
1122 | /* ::operator new and ::operator delete must be coalesced, even | |
1123 | if not weak. There are 8 variants that we look for. */ | |
1124 | else if (TREE_CODE (exp) == FUNCTION_DECL | |
1125 | && ! DECL_ONE_ONLY (exp)) | |
1126 | { | |
1127 | const char * name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (exp)); | |
1128 | if (name[0] == '_' && name[1] == 'Z' | |
1129 | && ((name[2] == 'n' && (name[3] == 'a' || name[3] == 'w') | |
1130 | && name[4] == 'm') | |
1131 | || (name[2] == 'd' && (name[3] == 'a' || name[3] == 'l') | |
1132 | && name[4] == 'P' && name[5] == 'v'))) | |
1133 | { | |
1134 | bool delete_p = name[2] == 'd'; | |
1135 | if (name[5 + delete_p] == 0 | |
1136 | || strcmp (name + 5 + delete_p, "KSt9nothrow_t") == 0) | |
1137 | base_funs[reloc][1] (); | |
1138 | else | |
1139 | base_function (); | |
1140 | } | |
1141 | else | |
1142 | base_function (); | |
1143 | } | |
1144 | else | |
1145 | base_function (); | |
1146 | } | |
1147 | ||
1148 | /* This can be called with address expressions as "rtx". | |
1149 | They must go in "const". */ | |
1150 | ||
1151 | void | |
1152 | machopic_select_rtx_section (enum machine_mode mode, rtx x, | |
1153 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) | |
1154 | { | |
1155 | if (GET_MODE_SIZE (mode) == 8 | |
1156 | && (GET_CODE (x) == CONST_INT | |
1157 | || GET_CODE (x) == CONST_DOUBLE)) | |
1158 | literal8_section (); | |
1159 | else if (GET_MODE_SIZE (mode) == 4 | |
1160 | && (GET_CODE (x) == CONST_INT | |
1161 | || GET_CODE (x) == CONST_DOUBLE)) | |
1162 | literal4_section (); | |
1163 | else if (MACHOPIC_INDIRECT | |
1164 | && (GET_CODE (x) == SYMBOL_REF | |
1165 | || GET_CODE (x) == CONST | |
1166 | || GET_CODE (x) == LABEL_REF)) | |
1167 | const_data_section (); | |
1168 | else | |
1169 | const_section (); | |
1170 | } | |
1171 | ||
1172 | void | |
1173 | machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED) | |
1174 | { | |
1175 | if (MACHOPIC_INDIRECT) | |
1176 | mod_init_section (); | |
1177 | else | |
1178 | constructor_section (); | |
1179 | assemble_align (POINTER_SIZE); | |
1180 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
1181 | ||
1182 | if (! MACHOPIC_INDIRECT) | |
1183 | fprintf (asm_out_file, ".reference .constructors_used\n"); | |
1184 | } | |
1185 | ||
1186 | void | |
1187 | machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED) | |
1188 | { | |
1189 | if (MACHOPIC_INDIRECT) | |
1190 | mod_term_section (); | |
1191 | else | |
1192 | destructor_section (); | |
1193 | assemble_align (POINTER_SIZE); | |
1194 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
1195 | ||
1196 | if (! MACHOPIC_INDIRECT) | |
1197 | fprintf (asm_out_file, ".reference .destructors_used\n"); | |
1198 | } | |
1199 | ||
1200 | void | |
1201 | darwin_globalize_label (FILE *stream, const char *name) | |
1202 | { | |
1203 | if (!!strncmp (name, "_OBJC_", 6)) | |
1204 | default_globalize_label (stream, name); | |
1205 | } | |
1206 | ||
1207 | void | |
1208 | darwin_asm_named_section (const char *name, | |
1209 | unsigned int flags ATTRIBUTE_UNUSED, | |
1210 | tree decl ATTRIBUTE_UNUSED) | |
1211 | { | |
1212 | fprintf (asm_out_file, "\t.section %s\n", name); | |
1213 | } | |
1214 | ||
1215 | void | |
1216 | darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED) | |
1217 | { | |
1218 | /* Darwin does not use unique sections. */ | |
1219 | } | |
1220 | ||
1221 | /* Handle a "weak_import" attribute; arguments as in | |
1222 | struct attribute_spec.handler. */ | |
1223 | ||
1224 | tree | |
1225 | darwin_handle_weak_import_attribute (tree *node, tree name, | |
1226 | tree ARG_UNUSED (args), | |
1227 | int ARG_UNUSED (flags), | |
1228 | bool * no_add_attrs) | |
1229 | { | |
1230 | if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL) | |
1231 | { | |
1232 | warning (0, "%qs attribute ignored", IDENTIFIER_POINTER (name)); | |
1233 | *no_add_attrs = true; | |
1234 | } | |
1235 | else | |
1236 | declare_weak (*node); | |
1237 | ||
1238 | return NULL_TREE; | |
1239 | } | |
1240 | ||
1241 | static void | |
1242 | no_dead_strip (FILE *file, const char *lab) | |
1243 | { | |
1244 | fprintf (file, ".no_dead_strip %s\n", lab); | |
1245 | } | |
1246 | ||
1247 | /* Emit a label for an FDE, making it global and/or weak if appropriate. | |
1248 | The third parameter is nonzero if this is for exception handling. | |
1249 | The fourth parameter is nonzero if this is just a placeholder for an | |
1250 | FDE that we are omitting. */ | |
1251 | ||
1252 | void | |
1253 | darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty) | |
1254 | { | |
1255 | tree id = DECL_ASSEMBLER_NAME (decl) | |
1256 | ? DECL_ASSEMBLER_NAME (decl) | |
1257 | : DECL_NAME (decl); | |
1258 | ||
1259 | const char *prefix = user_label_prefix; | |
1260 | ||
1261 | const char *base = IDENTIFIER_POINTER (id); | |
1262 | unsigned int base_len = IDENTIFIER_LENGTH (id); | |
1263 | ||
1264 | const char *suffix = ".eh"; | |
1265 | ||
1266 | int need_quotes = name_needs_quotes (base); | |
1267 | int quotes_len = need_quotes ? 2 : 0; | |
1268 | char *lab; | |
1269 | ||
1270 | if (! for_eh) | |
1271 | suffix = ".eh1"; | |
1272 | ||
1273 | lab = xmalloc (strlen (prefix) | |
1274 | + base_len + strlen (suffix) + quotes_len + 1); | |
1275 | lab[0] = '\0'; | |
1276 | ||
1277 | if (need_quotes) | |
1278 | strcat(lab, "\""); | |
1279 | strcat(lab, prefix); | |
1280 | strcat(lab, base); | |
1281 | strcat(lab, suffix); | |
1282 | if (need_quotes) | |
1283 | strcat(lab, "\""); | |
1284 | ||
1285 | if (TREE_PUBLIC (decl)) | |
1286 | fprintf (file, "\t%s %s\n", | |
1287 | (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN | |
1288 | ? ".globl" | |
1289 | : ".private_extern"), | |
1290 | lab); | |
1291 | ||
1292 | if (DECL_WEAK (decl)) | |
1293 | fprintf (file, "\t.weak_definition %s\n", lab); | |
1294 | ||
1295 | if (empty) | |
1296 | { | |
1297 | fprintf (file, "%s = 0\n", lab); | |
1298 | ||
1299 | /* Mark the absolute .eh and .eh1 style labels as needed to | |
1300 | ensure that we don't dead code strip them and keep such | |
1301 | labels from another instantiation point until we can fix this | |
1302 | properly with group comdat support. */ | |
1303 | no_dead_strip (file, lab); | |
1304 | } | |
1305 | else | |
1306 | fprintf (file, "%s:\n", lab); | |
1307 | ||
1308 | free (lab); | |
1309 | } | |
1310 | ||
1311 | /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */ | |
1312 | ||
1313 | void | |
1314 | darwin_non_lazy_pcrel (FILE *file, rtx addr) | |
1315 | { | |
1316 | const char *nlp_name; | |
1317 | ||
1318 | if (GET_CODE (addr) != SYMBOL_REF) | |
1319 | abort (); | |
1320 | ||
1321 | nlp_name = machopic_indirection_name (addr, /*stub_p=*/false); | |
1322 | fputs ("\t.long\t", file); | |
1323 | ASM_OUTPUT_LABELREF (file, nlp_name); | |
1324 | fputs ("-.", file); | |
1325 | } | |
1326 | ||
1327 | /* Emit an assembler directive to set visibility for a symbol. The | |
1328 | only supported visibilities are VISIBILITY_DEFAULT and | |
1329 | VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private | |
1330 | extern". There is no MACH-O equivalent of ELF's | |
1331 | VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */ | |
1332 | ||
1333 | void | |
1334 | darwin_assemble_visibility (tree decl, int vis) | |
1335 | { | |
1336 | if (vis == VISIBILITY_DEFAULT) | |
1337 | ; | |
1338 | else if (vis == VISIBILITY_HIDDEN) | |
1339 | { | |
1340 | fputs ("\t.private_extern ", asm_out_file); | |
1341 | assemble_name (asm_out_file, | |
1342 | (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)))); | |
1343 | fputs ("\n", asm_out_file); | |
1344 | } | |
1345 | else | |
1346 | warning (0, "internal and protected visibility attributes not supported " | |
1347 | "in this configuration; ignored"); | |
1348 | } | |
1349 | ||
1350 | /* Output a difference of two labels that will be an assembly time | |
1351 | constant if the two labels are local. (.long lab1-lab2 will be | |
1352 | very different if lab1 is at the boundary between two sections; it | |
1353 | will be relocated according to the second section, not the first, | |
1354 | so one ends up with a difference between labels in different | |
1355 | sections, which is bad in the dwarf2 eh context for instance.) */ | |
1356 | ||
1357 | static int darwin_dwarf_label_counter; | |
1358 | ||
1359 | void | |
1360 | darwin_asm_output_dwarf_delta (FILE *file, int size, | |
1361 | const char *lab1, const char *lab2) | |
1362 | { | |
1363 | int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L' | |
1364 | && lab2[0] == '*' && lab2[1] == 'L'); | |
1365 | const char *directive = (size == 8 ? ".quad" : ".long"); | |
1366 | ||
1367 | if (islocaldiff) | |
1368 | fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter); | |
1369 | else | |
1370 | fprintf (file, "\t%s\t", directive); | |
1371 | assemble_name_raw (file, lab1); | |
1372 | fprintf (file, "-"); | |
1373 | assemble_name_raw (file, lab2); | |
1374 | if (islocaldiff) | |
1375 | fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++); | |
1376 | } | |
1377 | ||
1378 | void | |
1379 | darwin_file_end (void) | |
1380 | { | |
1381 | machopic_finish (asm_out_file); | |
1382 | if (strcmp (lang_hooks.name, "GNU C++") == 0) | |
1383 | { | |
1384 | constructor_section (); | |
1385 | destructor_section (); | |
1386 | ASM_OUTPUT_ALIGN (asm_out_file, 1); | |
1387 | } | |
1388 | fprintf (asm_out_file, "\t.subsections_via_symbols\n"); | |
1389 | } | |
1390 | ||
1391 | #include "gt-darwin.h" |