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80d725d7 | 1 | /* Functions for generic Darwin as target machine for GNU C compiler. |
2be1b07e | 2 | Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004, |
3 | 2005 | |
80d725d7 | 4 | Free Software Foundation, Inc. |
5 | Contributed by Apple Computer Inc. | |
6 | ||
187b36cf | 7 | This file is part of GCC. |
80d725d7 | 8 | |
187b36cf | 9 | GCC is free software; you can redistribute it and/or modify |
80d725d7 | 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 | ||
187b36cf | 14 | GCC is distributed in the hope that it will be useful, |
80d725d7 | 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 | |
187b36cf | 20 | along with GCC; see the file COPYING. If not, write to |
80d725d7 | 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" | |
805e22b2 | 26 | #include "coretypes.h" |
27 | #include "tm.h" | |
80d725d7 | 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" | |
80d725d7 | 41 | #include "function.h" |
42 | #include "ggc.h" | |
d19bd1f0 | 43 | #include "langhooks.h" |
6d3abfc0 | 44 | #include "target.h" |
79e2a0ca | 45 | #include "tm_p.h" |
2c5b6111 | 46 | #include "errors.h" |
ab06d2ff | 47 | #include "hashtab.h" |
80d725d7 | 48 | |
f0ed0e8a | 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 | |
d188633a | 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. | |
f0ed0e8a | 61 | |
8063e558 | 62 | The changes are to insert 5 nops at the beginning of all functions |
d188633a | 63 | and to use indirection to get at static symbols. The 5 nops |
f0ed0e8a | 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, | |
84cbcde5 | 67 | including existing function pointers and virtual methods. See |
f0ed0e8a | 68 | rs6000_emit_prologue for the code that handles the nop insertions. |
69 | ||
70 | The added indirection allows gdb to redirect accesses to static | |
d188633a | 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. */ | |
f0ed0e8a | 78 | |
79 | ||
80d725d7 | 80 | int |
b40da9a7 | 81 | name_needs_quotes (const char *name) |
80d725d7 | 82 | { |
83 | int c; | |
84 | while ((c = *name++) != '\0') | |
37ec5024 | 85 | if (! ISIDNUM (c) && c != '.' && c != '$') |
80d725d7 | 86 | return 1; |
87 | return 0; | |
88 | } | |
89 | ||
866318b4 | 90 | /* Return true if SYM_REF can be used without an indirection. */ |
ab06d2ff | 91 | static int |
92 | machopic_symbol_defined_p (rtx sym_ref) | |
80d725d7 | 93 | { |
866318b4 | 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; | |
80d725d7 | 114 | } |
115 | ||
ab06d2ff | 116 | /* This module assumes that (const (symbol_ref "foo")) is a legal pic |
117 | reference, which will not be changed. */ | |
b40da9a7 | 118 | |
80d725d7 | 119 | enum machopic_addr_class |
ab06d2ff | 120 | machopic_classify_symbol (rtx sym_ref) |
80d725d7 | 121 | { |
ab06d2ff | 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); | |
80d725d7 | 133 | } |
134 | ||
f0ed0e8a | 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 | |
0975351b | 141 | rebound in a new translation unit to reference the original instance |
f0ed0e8a | 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'))) | |
78a79402 | 168 | || (strncmp (name, "_OBJC_", 6) == 0)); |
f0ed0e8a | 169 | |
170 | return ! lprefix; | |
171 | } | |
172 | ||
173 | ||
80d725d7 | 174 | static int |
ab06d2ff | 175 | machopic_data_defined_p (rtx sym_ref) |
80d725d7 | 176 | { |
f0ed0e8a | 177 | if (indirect_data (sym_ref)) |
178 | return 0; | |
179 | ||
ab06d2ff | 180 | switch (machopic_classify_symbol (sym_ref)) |
80d725d7 | 181 | { |
182 | case MACHOPIC_DEFINED_DATA: | |
3a7ccce8 | 183 | case MACHOPIC_DEFINED_FUNCTION: |
80d725d7 | 184 | return 1; |
185 | default: | |
186 | return 0; | |
187 | } | |
188 | } | |
189 | ||
80d725d7 | 190 | void |
ab06d2ff | 191 | machopic_define_symbol (rtx mem) |
80d725d7 | 192 | { |
ab06d2ff | 193 | rtx sym_ref; |
27d2baef | 194 | |
195 | gcc_assert (GET_CODE (mem) == MEM); | |
ab06d2ff | 196 | sym_ref = XEXP (mem, 0); |
197 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; | |
80d725d7 | 198 | } |
199 | ||
3a32429b | 200 | static GTY(()) char * function_base; |
80d725d7 | 201 | |
a7260dec | 202 | const char * |
b40da9a7 | 203 | machopic_function_base_name (void) |
80d725d7 | 204 | { |
8f74ae7b | 205 | /* if dynamic-no-pic is on, we should not get here */ |
27d2baef | 206 | gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); |
80d725d7 | 207 | |
b186bdc9 | 208 | if (function_base == NULL) |
b40da9a7 | 209 | function_base = |
b186bdc9 | 210 | (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>")); |
211 | ||
212 | current_function_uses_pic_offset_table = 1; | |
213 | ||
214 | return function_base; | |
215 | } | |
216 | ||
ab06d2ff | 217 | /* Return a SYMBOL_REF for the PIC function base. */ |
218 | ||
219 | rtx | |
220 | machopic_function_base_sym (void) | |
221 | { | |
222 | rtx sym_ref; | |
223 | ||
224 | sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ()); | |
225 | SYMBOL_REF_FLAGS (sym_ref) | |
226 | |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED); | |
227 | return sym_ref; | |
228 | } | |
229 | ||
b186bdc9 | 230 | static GTY(()) const char * function_base_func_name; |
231 | static GTY(()) int current_pic_label_num; | |
232 | ||
233 | void | |
234 | machopic_output_function_base_name (FILE *file) | |
235 | { | |
236 | const char *current_name; | |
237 | ||
1d60d981 | 238 | /* If dynamic-no-pic is on, we should not get here. */ |
27d2baef | 239 | gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); |
b40da9a7 | 240 | current_name = |
b186bdc9 | 241 | IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); |
3a32429b | 242 | if (function_base_func_name != current_name) |
80d725d7 | 243 | { |
80d725d7 | 244 | ++current_pic_label_num; |
3a32429b | 245 | function_base_func_name = current_name; |
80d725d7 | 246 | } |
b186bdc9 | 247 | fprintf (file, "\"L%011d$pb\"", current_pic_label_num); |
80d725d7 | 248 | } |
249 | ||
ab06d2ff | 250 | /* The suffix attached to non-lazy pointer symbols. */ |
251 | #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr" | |
252 | /* The suffix attached to stub symbols. */ | |
253 | #define STUB_SUFFIX "$stub" | |
80d725d7 | 254 | |
ab06d2ff | 255 | typedef struct machopic_indirection GTY (()) |
80d725d7 | 256 | { |
ab06d2ff | 257 | /* The SYMBOL_REF for the entity referenced. */ |
258 | rtx symbol; | |
6d3abfc0 | 259 | /* The name of the stub or non-lazy pointer. */ |
260 | const char * ptr_name; | |
ab06d2ff | 261 | /* True iff this entry is for a stub (as opposed to a non-lazy |
262 | pointer). */ | |
263 | bool stub_p; | |
264 | /* True iff this stub or pointer pointer has been referenced. */ | |
265 | bool used; | |
266 | } machopic_indirection; | |
267 | ||
268 | /* A table mapping stub names and non-lazy pointer names to | |
269 | SYMBOL_REFs for the stubbed-to and pointed-to entities. */ | |
270 | ||
271 | static GTY ((param_is (struct machopic_indirection))) htab_t | |
272 | machopic_indirections; | |
273 | ||
274 | /* Return a hash value for a SLOT in the indirections hash table. */ | |
275 | ||
276 | static hashval_t | |
277 | machopic_indirection_hash (const void *slot) | |
278 | { | |
279 | const machopic_indirection *p = (const machopic_indirection *) slot; | |
6d3abfc0 | 280 | return htab_hash_string (p->ptr_name); |
ab06d2ff | 281 | } |
b40da9a7 | 282 | |
ab06d2ff | 283 | /* Returns true if the KEY is the same as that associated with |
284 | SLOT. */ | |
285 | ||
286 | static int | |
287 | machopic_indirection_eq (const void *slot, const void *key) | |
288 | { | |
6d3abfc0 | 289 | return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0; |
ab06d2ff | 290 | } |
80d725d7 | 291 | |
ab06d2ff | 292 | /* Return the name of the non-lazy pointer (if STUB_P is false) or |
293 | stub (if STUB_B is true) corresponding to the given name. */ | |
8dfaa51b | 294 | |
ab06d2ff | 295 | const char * |
296 | machopic_indirection_name (rtx sym_ref, bool stub_p) | |
297 | { | |
298 | char *buffer; | |
299 | const char *name = XSTR (sym_ref, 0); | |
6d3abfc0 | 300 | size_t namelen = strlen (name); |
ab06d2ff | 301 | machopic_indirection *p; |
6d3abfc0 | 302 | void ** slot; |
524eafbc | 303 | bool saw_star = false; |
304 | bool needs_quotes; | |
305 | const char *suffix; | |
306 | const char *prefix = user_label_prefix; | |
307 | const char *quote = ""; | |
ab06d2ff | 308 | |
524eafbc | 309 | if (name[0] == '*') |
8dfaa51b | 310 | { |
524eafbc | 311 | saw_star = true; |
312 | prefix = ""; | |
313 | ++name; | |
314 | --namelen; | |
ab06d2ff | 315 | } |
524eafbc | 316 | |
317 | needs_quotes = name_needs_quotes (name); | |
318 | if (needs_quotes) | |
ab06d2ff | 319 | { |
524eafbc | 320 | quote = "\""; |
8dfaa51b | 321 | } |
322 | ||
524eafbc | 323 | if (stub_p) |
324 | suffix = STUB_SUFFIX; | |
325 | else | |
326 | suffix = NON_LAZY_POINTER_SUFFIX; | |
327 | ||
328 | buffer = alloca (strlen ("&L") | |
329 | + strlen (prefix) | |
330 | + namelen | |
331 | + strlen (suffix) | |
332 | + 2 * strlen (quote) | |
333 | + 1 /* '\0' */); | |
334 | ||
335 | /* Construct the name of the non-lazy pointer or stub. */ | |
336 | sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote); | |
337 | ||
6d3abfc0 | 338 | if (!machopic_indirections) |
339 | machopic_indirections = htab_create_ggc (37, | |
340 | machopic_indirection_hash, | |
341 | machopic_indirection_eq, | |
342 | /*htab_del=*/NULL); | |
343 | ||
344 | slot = htab_find_slot_with_hash (machopic_indirections, buffer, | |
345 | htab_hash_string (buffer), INSERT); | |
346 | if (*slot) | |
347 | { | |
348 | p = (machopic_indirection *) *slot; | |
349 | } | |
350 | else | |
ab06d2ff | 351 | { |
ab06d2ff | 352 | p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection)); |
353 | p->symbol = sym_ref; | |
6d3abfc0 | 354 | p->ptr_name = xstrdup (buffer); |
ab06d2ff | 355 | p->stub_p = stub_p; |
6d3abfc0 | 356 | p->used = false; |
357 | *slot = p; | |
ab06d2ff | 358 | } |
359 | ||
6d3abfc0 | 360 | return p->ptr_name; |
80d725d7 | 361 | } |
362 | ||
ab06d2ff | 363 | /* Return the name of the stub for the mcount function. */ |
80d725d7 | 364 | |
ab06d2ff | 365 | const char* |
366 | machopic_mcount_stub_name (void) | |
80d725d7 | 367 | { |
620dd87a | 368 | rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount"); |
369 | return machopic_indirection_name (symbol, /*stub_p=*/true); | |
80d725d7 | 370 | } |
371 | ||
ab06d2ff | 372 | /* If NAME is the name of a stub or a non-lazy pointer , mark the stub |
373 | or non-lazy pointer as used -- and mark the object to which the | |
374 | pointer/stub refers as used as well, since the pointer/stub will | |
375 | emit a reference to it. */ | |
376 | ||
80d725d7 | 377 | void |
ab06d2ff | 378 | machopic_validate_stub_or_non_lazy_ptr (const char *name) |
80d725d7 | 379 | { |
ab06d2ff | 380 | machopic_indirection *p; |
381 | ||
382 | p = ((machopic_indirection *) | |
6d3abfc0 | 383 | (htab_find_with_hash (machopic_indirections, name, |
384 | htab_hash_string (name)))); | |
385 | if (p && ! p->used) | |
ab06d2ff | 386 | { |
6d3abfc0 | 387 | const char *real_name; |
388 | tree id; | |
389 | ||
390 | p->used = true; | |
391 | ||
09e39ca0 | 392 | /* Do what output_addr_const will do when we actually call it. */ |
393 | if (SYMBOL_REF_DECL (p->symbol)) | |
394 | mark_decl_referenced (SYMBOL_REF_DECL (p->symbol)); | |
395 | ||
396 | real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0)); | |
6d3abfc0 | 397 | |
398 | id = maybe_get_identifier (real_name); | |
399 | if (id) | |
400 | mark_referenced (id); | |
ab06d2ff | 401 | } |
80d725d7 | 402 | } |
403 | ||
404 | /* Transform ORIG, which may be any data source, to the corresponding | |
405 | source using indirections. */ | |
406 | ||
407 | rtx | |
b40da9a7 | 408 | machopic_indirect_data_reference (rtx orig, rtx reg) |
80d725d7 | 409 | { |
410 | rtx ptr_ref = orig; | |
b40da9a7 | 411 | |
80d725d7 | 412 | if (! MACHOPIC_INDIRECT) |
413 | return orig; | |
414 | ||
415 | if (GET_CODE (orig) == SYMBOL_REF) | |
416 | { | |
ab06d2ff | 417 | int defined = machopic_data_defined_p (orig); |
8f74ae7b | 418 | |
419 | if (defined && MACHO_DYNAMIC_NO_PIC_P) | |
420 | { | |
421 | #if defined (TARGET_TOC) | |
301a5e52 | 422 | emit_insn (gen_macho_high (reg, orig)); |
423 | emit_insn (gen_macho_low (reg, reg, orig)); | |
8f74ae7b | 424 | #else |
425 | /* some other cpu -- writeme! */ | |
27d2baef | 426 | gcc_unreachable (); |
8f74ae7b | 427 | #endif |
428 | return reg; | |
429 | } | |
430 | else if (defined) | |
80d725d7 | 431 | { |
5352873f | 432 | #if defined (TARGET_TOC) || defined (HAVE_lo_sum) |
ab06d2ff | 433 | rtx pic_base = machopic_function_base_sym (); |
37ec5024 | 434 | rtx offset = gen_rtx_CONST (Pmode, |
435 | gen_rtx_MINUS (Pmode, orig, pic_base)); | |
5352873f | 436 | #endif |
80d725d7 | 437 | |
438 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
64668281 | 439 | rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode)); |
80d725d7 | 440 | |
27d2baef | 441 | gcc_assert (reg); |
80d725d7 | 442 | |
37ec5024 | 443 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, |
444 | gen_rtx_PLUS (Pmode, pic_offset_table_rtx, | |
445 | gen_rtx_HIGH (Pmode, offset)))); | |
446 | emit_insn (gen_rtx_SET (Pmode, reg, | |
447 | gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset))); | |
80d725d7 | 448 | |
449 | orig = reg; | |
450 | #else | |
451 | #if defined (HAVE_lo_sum) | |
27d2baef | 452 | gcc_assert (reg); |
80d725d7 | 453 | |
37ec5024 | 454 | emit_insn (gen_rtx_SET (VOIDmode, reg, |
455 | gen_rtx_HIGH (Pmode, offset))); | |
456 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
457 | gen_rtx_LO_SUM (Pmode, reg, offset))); | |
458 | emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx)); | |
80d725d7 | 459 | |
37ec5024 | 460 | orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg); |
80d725d7 | 461 | #endif |
462 | #endif | |
463 | return orig; | |
464 | } | |
465 | ||
329f67ae | 466 | ptr_ref = (gen_rtx_SYMBOL_REF |
ab06d2ff | 467 | (Pmode, |
468 | machopic_indirection_name (orig, /*stub_p=*/false))); | |
80d725d7 | 469 | |
e265a6da | 470 | SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig); |
f9226418 | 471 | |
e265a6da | 472 | ptr_ref = gen_const_mem (Pmode, ptr_ref); |
329f67ae | 473 | machopic_define_symbol (ptr_ref); |
80d725d7 | 474 | |
475 | return ptr_ref; | |
476 | } | |
477 | else if (GET_CODE (orig) == CONST) | |
478 | { | |
479 | rtx base, result; | |
480 | ||
481 | /* legitimize both operands of the PLUS */ | |
482 | if (GET_CODE (XEXP (orig, 0)) == PLUS) | |
483 | { | |
484 | base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0), | |
485 | reg); | |
486 | orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1), | |
487 | (base == reg ? 0 : reg)); | |
488 | } | |
b40da9a7 | 489 | else |
80d725d7 | 490 | return orig; |
491 | ||
492 | if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT) | |
b244d4c7 | 493 | result = plus_constant (base, INTVAL (orig)); |
80d725d7 | 494 | else |
37ec5024 | 495 | result = gen_rtx_PLUS (Pmode, base, orig); |
80d725d7 | 496 | |
80d725d7 | 497 | if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM) |
498 | { | |
499 | if (reg) | |
500 | { | |
501 | emit_move_insn (reg, result); | |
502 | result = reg; | |
503 | } | |
504 | else | |
505 | { | |
506 | result = force_reg (GET_MODE (result), result); | |
507 | } | |
508 | } | |
509 | ||
510 | return result; | |
511 | ||
512 | } | |
513 | else if (GET_CODE (orig) == MEM) | |
514 | XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg); | |
515 | /* When the target is i386, this code prevents crashes due to the | |
516 | compiler's ignorance on how to move the PIC base register to | |
517 | other registers. (The reload phase sometimes introduces such | |
518 | insns.) */ | |
519 | else if (GET_CODE (orig) == PLUS | |
520 | && GET_CODE (XEXP (orig, 0)) == REG | |
521 | && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM | |
522 | #ifdef I386 | |
523 | /* Prevent the same register from being erroneously used | |
524 | as both the base and index registers. */ | |
525 | && GET_CODE (XEXP (orig, 1)) == CONST | |
526 | #endif | |
527 | && reg) | |
528 | { | |
529 | emit_move_insn (reg, XEXP (orig, 0)); | |
530 | XEXP (ptr_ref, 0) = reg; | |
531 | } | |
532 | return ptr_ref; | |
533 | } | |
534 | ||
80d725d7 | 535 | /* Transform TARGET (a MEM), which is a function call target, to the |
536 | corresponding symbol_stub if necessary. Return a new MEM. */ | |
537 | ||
538 | rtx | |
b40da9a7 | 539 | machopic_indirect_call_target (rtx target) |
80d725d7 | 540 | { |
541 | if (GET_CODE (target) != MEM) | |
542 | return target; | |
543 | ||
ab06d2ff | 544 | if (MACHOPIC_INDIRECT |
545 | && GET_CODE (XEXP (target, 0)) == SYMBOL_REF | |
546 | && !(SYMBOL_REF_FLAGS (XEXP (target, 0)) | |
547 | & MACHO_SYMBOL_FLAG_DEFINED)) | |
b40da9a7 | 548 | { |
ab06d2ff | 549 | rtx sym_ref = XEXP (target, 0); |
550 | const char *stub_name = machopic_indirection_name (sym_ref, | |
551 | /*stub_p=*/true); | |
552 | enum machine_mode mode = GET_MODE (sym_ref); | |
553 | tree decl = SYMBOL_REF_DECL (sym_ref); | |
554 | ||
555 | XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name); | |
556 | SYMBOL_REF_DECL (XEXP (target, 0)) = decl; | |
b04fab2a | 557 | MEM_READONLY_P (target) = 1; |
e265a6da | 558 | MEM_NOTRAP_P (target) = 1; |
80d725d7 | 559 | } |
560 | ||
561 | return target; | |
562 | } | |
563 | ||
564 | rtx | |
b40da9a7 | 565 | machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) |
80d725d7 | 566 | { |
567 | rtx pic_ref = orig; | |
568 | ||
8f74ae7b | 569 | if (! MACHOPIC_INDIRECT) |
80d725d7 | 570 | return orig; |
571 | ||
572 | /* First handle a simple SYMBOL_REF or LABEL_REF */ | |
573 | if (GET_CODE (orig) == LABEL_REF | |
574 | || (GET_CODE (orig) == SYMBOL_REF | |
575 | )) | |
576 | { | |
577 | /* addr(foo) = &func+(foo-func) */ | |
578 | rtx pic_base; | |
579 | ||
580 | orig = machopic_indirect_data_reference (orig, reg); | |
581 | ||
b40da9a7 | 582 | if (GET_CODE (orig) == PLUS |
80d725d7 | 583 | && GET_CODE (XEXP (orig, 0)) == REG) |
584 | { | |
585 | if (reg == 0) | |
586 | return force_reg (mode, orig); | |
587 | ||
588 | emit_move_insn (reg, orig); | |
589 | return reg; | |
b40da9a7 | 590 | } |
80d725d7 | 591 | |
8f74ae7b | 592 | /* if dynamic-no-pic then use 0 as the pic base */ |
593 | if (MACHO_DYNAMIC_NO_PIC_P) | |
594 | pic_base = CONST0_RTX (Pmode); | |
595 | else | |
ab06d2ff | 596 | pic_base = machopic_function_base_sym (); |
80d725d7 | 597 | |
598 | if (GET_CODE (orig) == MEM) | |
599 | { | |
600 | if (reg == 0) | |
601 | { | |
27d2baef | 602 | gcc_assert (!reload_in_progress); |
603 | reg = gen_reg_rtx (Pmode); | |
80d725d7 | 604 | } |
b40da9a7 | 605 | |
80d725d7 | 606 | #ifdef HAVE_lo_sum |
8f74ae7b | 607 | if (MACHO_DYNAMIC_NO_PIC_P |
608 | && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
609 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF)) | |
610 | { | |
611 | #if defined (TARGET_TOC) /* ppc */ | |
612 | rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode); | |
613 | rtx asym = XEXP (orig, 0); | |
614 | rtx mem; | |
615 | ||
301a5e52 | 616 | emit_insn (gen_macho_high (temp_reg, asym)); |
e265a6da | 617 | mem = gen_const_mem (GET_MODE (orig), |
618 | gen_rtx_LO_SUM (Pmode, temp_reg, asym)); | |
37ec5024 | 619 | emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); |
8f74ae7b | 620 | #else |
621 | /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */ | |
27d2baef | 622 | gcc_unreachable (); |
8f74ae7b | 623 | #endif |
624 | pic_ref = reg; | |
625 | } | |
626 | else | |
b40da9a7 | 627 | if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF |
80d725d7 | 628 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) |
629 | { | |
37ec5024 | 630 | rtx offset = gen_rtx_CONST (Pmode, |
631 | gen_rtx_MINUS (Pmode, | |
632 | XEXP (orig, 0), | |
633 | pic_base)); | |
80d725d7 | 634 | #if defined (TARGET_TOC) /* i.e., PowerPC */ |
635 | /* Generating a new reg may expose opportunities for | |
636 | common subexpression elimination. */ | |
09c6aad0 | 637 | rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode); |
37ec5024 | 638 | rtx mem; |
639 | rtx insn; | |
640 | rtx sum; | |
641 | ||
642 | sum = gen_rtx_HIGH (Pmode, offset); | |
643 | if (! MACHO_DYNAMIC_NO_PIC_P) | |
644 | sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum); | |
80d725d7 | 645 | |
37ec5024 | 646 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum)); |
647 | ||
e265a6da | 648 | mem = gen_const_mem (GET_MODE (orig), |
649 | gen_rtx_LO_SUM (Pmode, | |
650 | hi_sum_reg, offset)); | |
37ec5024 | 651 | insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); |
652 | REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref, | |
653 | REG_NOTES (insn)); | |
654 | ||
655 | pic_ref = reg; | |
80d725d7 | 656 | #else |
37ec5024 | 657 | emit_insn (gen_rtx_USE (VOIDmode, |
658 | gen_rtx_REG (Pmode, | |
659 | PIC_OFFSET_TABLE_REGNUM))); | |
660 | ||
661 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
662 | gen_rtx_HIGH (Pmode, | |
663 | gen_rtx_CONST (Pmode, | |
664 | offset)))); | |
665 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
666 | gen_rtx_LO_SUM (Pmode, reg, | |
667 | gen_rtx_CONST (Pmode, offset)))); | |
668 | pic_ref = gen_rtx_PLUS (Pmode, | |
669 | pic_offset_table_rtx, reg); | |
80d725d7 | 670 | #endif |
671 | } | |
672 | else | |
673 | #endif /* HAVE_lo_sum */ | |
674 | { | |
675 | rtx pic = pic_offset_table_rtx; | |
676 | if (GET_CODE (pic) != REG) | |
677 | { | |
678 | emit_move_insn (reg, pic); | |
679 | pic = reg; | |
680 | } | |
681 | #if 0 | |
37ec5024 | 682 | emit_insn (gen_rtx_USE (VOIDmode, |
683 | gen_rtx_REG (Pmode, | |
684 | PIC_OFFSET_TABLE_REGNUM))); | |
80d725d7 | 685 | #endif |
686 | ||
37ec5024 | 687 | pic_ref = gen_rtx_PLUS (Pmode, |
688 | pic, | |
689 | gen_rtx_CONST (Pmode, | |
690 | gen_rtx_MINUS (Pmode, | |
691 | XEXP (orig, 0), | |
692 | pic_base))); | |
80d725d7 | 693 | } |
b40da9a7 | 694 | |
80d725d7 | 695 | #if !defined (TARGET_TOC) |
80d725d7 | 696 | emit_move_insn (reg, pic_ref); |
e265a6da | 697 | pic_ref = gen_const_mem (GET_MODE (orig), reg); |
7ba97778 | 698 | #endif |
80d725d7 | 699 | } |
700 | else | |
701 | { | |
702 | ||
703 | #ifdef HAVE_lo_sum | |
b40da9a7 | 704 | if (GET_CODE (orig) == SYMBOL_REF |
80d725d7 | 705 | || GET_CODE (orig) == LABEL_REF) |
706 | { | |
37ec5024 | 707 | rtx offset = gen_rtx_CONST (Pmode, |
708 | gen_rtx_MINUS (Pmode, | |
709 | orig, pic_base)); | |
80d725d7 | 710 | #if defined (TARGET_TOC) /* i.e., PowerPC */ |
711 | rtx hi_sum_reg; | |
712 | ||
713 | if (reg == 0) | |
714 | { | |
27d2baef | 715 | gcc_assert (!reload_in_progress); |
716 | reg = gen_reg_rtx (Pmode); | |
80d725d7 | 717 | } |
b40da9a7 | 718 | |
80d725d7 | 719 | hi_sum_reg = reg; |
720 | ||
37ec5024 | 721 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, |
722 | (MACHO_DYNAMIC_NO_PIC_P) | |
723 | ? gen_rtx_HIGH (Pmode, offset) | |
724 | : gen_rtx_PLUS (Pmode, | |
725 | pic_offset_table_rtx, | |
726 | gen_rtx_HIGH (Pmode, | |
727 | offset)))); | |
728 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
729 | gen_rtx_LO_SUM (Pmode, | |
730 | hi_sum_reg, offset))); | |
80d725d7 | 731 | pic_ref = reg; |
732 | #else | |
37ec5024 | 733 | emit_insn (gen_rtx_SET (VOIDmode, reg, |
734 | gen_rtx_HIGH (Pmode, offset))); | |
735 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
736 | gen_rtx_LO_SUM (Pmode, reg, offset))); | |
737 | pic_ref = gen_rtx_PLUS (Pmode, | |
738 | pic_offset_table_rtx, reg); | |
80d725d7 | 739 | #endif |
740 | } | |
741 | else | |
742 | #endif /* HAVE_lo_sum */ | |
743 | { | |
7a5893fc | 744 | if (REG_P (orig) |
745 | || GET_CODE (orig) == SUBREG) | |
80d725d7 | 746 | { |
747 | return orig; | |
748 | } | |
749 | else | |
750 | { | |
751 | rtx pic = pic_offset_table_rtx; | |
752 | if (GET_CODE (pic) != REG) | |
753 | { | |
754 | emit_move_insn (reg, pic); | |
755 | pic = reg; | |
756 | } | |
757 | #if 0 | |
37ec5024 | 758 | emit_insn (gen_rtx_USE (VOIDmode, |
759 | pic_offset_table_rtx)); | |
80d725d7 | 760 | #endif |
37ec5024 | 761 | pic_ref = gen_rtx_PLUS (Pmode, |
762 | pic, | |
763 | gen_rtx_CONST (Pmode, | |
764 | gen_rtx_MINUS (Pmode, | |
765 | orig, pic_base))); | |
80d725d7 | 766 | } |
767 | } | |
768 | } | |
769 | ||
80d725d7 | 770 | if (GET_CODE (pic_ref) != REG) |
771 | { | |
772 | if (reg != 0) | |
773 | { | |
774 | emit_move_insn (reg, pic_ref); | |
775 | return reg; | |
776 | } | |
777 | else | |
778 | { | |
779 | return force_reg (mode, pic_ref); | |
780 | } | |
781 | } | |
782 | else | |
783 | { | |
784 | return pic_ref; | |
785 | } | |
786 | } | |
787 | ||
788 | else if (GET_CODE (orig) == SYMBOL_REF) | |
789 | return orig; | |
790 | ||
791 | else if (GET_CODE (orig) == PLUS | |
792 | && (GET_CODE (XEXP (orig, 0)) == MEM | |
793 | || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
794 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
795 | && XEXP (orig, 0) != pic_offset_table_rtx | |
796 | && GET_CODE (XEXP (orig, 1)) != REG) | |
b40da9a7 | 797 | |
80d725d7 | 798 | { |
799 | rtx base; | |
800 | int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM); | |
801 | ||
802 | base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
803 | orig = machopic_legitimize_pic_address (XEXP (orig, 1), | |
804 | Pmode, (base == reg ? 0 : reg)); | |
805 | if (GET_CODE (orig) == CONST_INT) | |
806 | { | |
b244d4c7 | 807 | pic_ref = plus_constant (base, INTVAL (orig)); |
80d725d7 | 808 | is_complex = 1; |
809 | } | |
810 | else | |
37ec5024 | 811 | pic_ref = gen_rtx_PLUS (Pmode, base, orig); |
80d725d7 | 812 | |
80d725d7 | 813 | if (reg && is_complex) |
814 | { | |
815 | emit_move_insn (reg, pic_ref); | |
816 | pic_ref = reg; | |
817 | } | |
818 | /* Likewise, should we set special REG_NOTEs here? */ | |
819 | } | |
820 | ||
821 | else if (GET_CODE (orig) == CONST) | |
822 | { | |
823 | return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
824 | } | |
825 | ||
826 | else if (GET_CODE (orig) == MEM | |
827 | && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF) | |
828 | { | |
829 | rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
b04fab2a | 830 | addr = replace_equiv_address (orig, addr); |
80d725d7 | 831 | emit_move_insn (reg, addr); |
832 | pic_ref = reg; | |
833 | } | |
834 | ||
835 | return pic_ref; | |
836 | } | |
837 | ||
ab06d2ff | 838 | /* Output the stub or non-lazy pointer in *SLOT, if it has been used. |
839 | DATA is the FILE* for assembly output. Called from | |
840 | htab_traverse. */ | |
80d725d7 | 841 | |
ab06d2ff | 842 | static int |
843 | machopic_output_indirection (void **slot, void *data) | |
80d725d7 | 844 | { |
ab06d2ff | 845 | machopic_indirection *p = *((machopic_indirection **) slot); |
846 | FILE *asm_out_file = (FILE *) data; | |
847 | rtx symbol; | |
848 | const char *sym_name; | |
849 | const char *ptr_name; | |
850 | ||
851 | if (!p->used) | |
852 | return 1; | |
80d725d7 | 853 | |
ab06d2ff | 854 | symbol = p->symbol; |
855 | sym_name = XSTR (symbol, 0); | |
6d3abfc0 | 856 | ptr_name = p->ptr_name; |
ab06d2ff | 857 | |
858 | if (p->stub_p) | |
80d725d7 | 859 | { |
80d725d7 | 860 | char *sym; |
861 | char *stub; | |
80d725d7 | 862 | |
80d725d7 | 863 | sym = alloca (strlen (sym_name) + 2); |
864 | if (sym_name[0] == '*' || sym_name[0] == '&') | |
865 | strcpy (sym, sym_name + 1); | |
866 | else if (sym_name[0] == '-' || sym_name[0] == '+') | |
b40da9a7 | 867 | strcpy (sym, sym_name); |
80d725d7 | 868 | else |
e9764bbb | 869 | sprintf (sym, "%s%s", user_label_prefix, sym_name); |
80d725d7 | 870 | |
ab06d2ff | 871 | stub = alloca (strlen (ptr_name) + 2); |
872 | if (ptr_name[0] == '*' || ptr_name[0] == '&') | |
873 | strcpy (stub, ptr_name + 1); | |
80d725d7 | 874 | else |
ab06d2ff | 875 | sprintf (stub, "%s%s", user_label_prefix, ptr_name); |
80d725d7 | 876 | |
09e39ca0 | 877 | machopic_output_stub (asm_out_file, sym, stub); |
80d725d7 | 878 | } |
f0ed0e8a | 879 | else if (! indirect_data (symbol) |
8d806159 | 880 | && (machopic_symbol_defined_p (symbol) |
881 | || SYMBOL_REF_LOCAL_P (symbol))) | |
80d725d7 | 882 | { |
ab06d2ff | 883 | data_section (); |
884 | assemble_align (GET_MODE_ALIGNMENT (Pmode)); | |
885 | assemble_label (ptr_name); | |
886 | assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name), | |
887 | GET_MODE_SIZE (Pmode), | |
888 | GET_MODE_ALIGNMENT (Pmode), 1); | |
80d725d7 | 889 | } |
ab06d2ff | 890 | else |
891 | { | |
f0ed0e8a | 892 | rtx init = const0_rtx; |
893 | ||
ab06d2ff | 894 | machopic_nl_symbol_ptr_section (); |
895 | assemble_name (asm_out_file, ptr_name); | |
896 | fprintf (asm_out_file, ":\n"); | |
897 | ||
898 | fprintf (asm_out_file, "\t.indirect_symbol "); | |
899 | assemble_name (asm_out_file, sym_name); | |
900 | fprintf (asm_out_file, "\n"); | |
901 | ||
f0ed0e8a | 902 | /* Variables that are marked with MACHO_SYMBOL_STATIC need to |
903 | have their symbol name instead of 0 in the second entry of | |
904 | the non-lazy symbol pointer data structure when they are | |
905 | defined. This allows the runtime to rebind newer instances | |
906 | of the translation unit with the original instance of the | |
d188633a | 907 | symbol. */ |
f0ed0e8a | 908 | |
909 | if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC) | |
910 | && machopic_symbol_defined_p (symbol)) | |
911 | init = gen_rtx_SYMBOL_REF (Pmode, sym_name); | |
912 | ||
913 | assemble_integer (init, GET_MODE_SIZE (Pmode), | |
ab06d2ff | 914 | GET_MODE_ALIGNMENT (Pmode), 1); |
915 | } | |
916 | ||
917 | return 1; | |
918 | } | |
919 | ||
920 | void | |
921 | machopic_finish (FILE *asm_out_file) | |
922 | { | |
923 | if (machopic_indirections) | |
f0ed0e8a | 924 | htab_traverse_noresize (machopic_indirections, |
ab06d2ff | 925 | machopic_output_indirection, |
926 | asm_out_file); | |
80d725d7 | 927 | } |
928 | ||
b40da9a7 | 929 | int |
930 | machopic_operand_p (rtx op) | |
80d725d7 | 931 | { |
932 | if (MACHOPIC_JUST_INDIRECT) | |
933 | { | |
934 | while (GET_CODE (op) == CONST) | |
935 | op = XEXP (op, 0); | |
936 | ||
937 | if (GET_CODE (op) == SYMBOL_REF) | |
ab06d2ff | 938 | return machopic_symbol_defined_p (op); |
80d725d7 | 939 | else |
940 | return 0; | |
941 | } | |
942 | ||
943 | while (GET_CODE (op) == CONST) | |
944 | op = XEXP (op, 0); | |
945 | ||
946 | if (GET_CODE (op) == MINUS | |
947 | && GET_CODE (XEXP (op, 0)) == SYMBOL_REF | |
948 | && GET_CODE (XEXP (op, 1)) == SYMBOL_REF | |
ab06d2ff | 949 | && machopic_symbol_defined_p (XEXP (op, 0)) |
950 | && machopic_symbol_defined_p (XEXP (op, 1))) | |
80d725d7 | 951 | return 1; |
952 | ||
80d725d7 | 953 | return 0; |
954 | } | |
8dfaa51b | 955 | |
956 | /* This function records whether a given name corresponds to a defined | |
957 | or undefined function or variable, for machopic_classify_ident to | |
958 | use later. */ | |
959 | ||
960 | void | |
b40da9a7 | 961 | darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED) |
8dfaa51b | 962 | { |
5a121a91 | 963 | rtx sym_ref; |
8dfaa51b | 964 | |
9af9a32c | 965 | /* Do the standard encoding things first. */ |
966 | default_encode_section_info (decl, rtl, first); | |
967 | ||
ab06d2ff | 968 | if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL) |
969 | return; | |
9af9a32c | 970 | |
ab06d2ff | 971 | sym_ref = XEXP (rtl, 0); |
972 | if (TREE_CODE (decl) == VAR_DECL) | |
973 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE; | |
974 | ||
975 | if (!DECL_EXTERNAL (decl) | |
1dc74225 | 976 | && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl)) |
8dfaa51b | 977 | && ((TREE_STATIC (decl) |
978 | && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl))) | |
2f4fae92 | 979 | || (!DECL_COMMON (decl) && DECL_INITIAL (decl) |
fd419242 | 980 | && DECL_INITIAL (decl) != error_mark_node))) |
ab06d2ff | 981 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; |
f0ed0e8a | 982 | |
d188633a | 983 | if (! TREE_PUBLIC (decl)) |
f0ed0e8a | 984 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC; |
e479d0de | 985 | } |
01d15dc5 | 986 | |
9423c9b7 | 987 | void |
988 | darwin_mark_decl_preserved (const char *name) | |
989 | { | |
990 | fprintf (asm_out_file, ".no_dead_strip "); | |
991 | assemble_name (asm_out_file, name); | |
992 | fputc ('\n', asm_out_file); | |
993 | } | |
994 | ||
52470889 | 995 | void |
b40da9a7 | 996 | machopic_select_section (tree exp, int reloc, |
997 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) | |
52470889 | 998 | { |
7def0f5c | 999 | void (*base_function)(void); |
1dc74225 | 1000 | bool weak_p = DECL_P (exp) && DECL_WEAK (exp); |
1001 | static void (* const base_funs[][2])(void) = { | |
1002 | { text_section, text_coal_section }, | |
1897b881 | 1003 | { unlikely_text_section, text_unlikely_coal_section }, |
1dc74225 | 1004 | { readonly_data_section, const_coal_section }, |
1005 | { const_data_section, const_data_coal_section }, | |
1006 | { data_section, data_coal_section } | |
1007 | }; | |
1008 | ||
1897b881 | 1009 | if (reloc == 0 |
1010 | && (last_text_section == in_text_unlikely | |
1011 | || last_text_section == in_text_unlikely_coal)) | |
1012 | reloc = 1; | |
1013 | ||
1dc74225 | 1014 | if (TREE_CODE (exp) == FUNCTION_DECL) |
1015 | base_function = base_funs[reloc][weak_p]; | |
1016 | else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT)) | |
1017 | base_function = base_funs[2][weak_p]; | |
7def0f5c | 1018 | else if (TREE_READONLY (exp) || TREE_CONSTANT (exp)) |
1dc74225 | 1019 | base_function = base_funs[3][weak_p]; |
7def0f5c | 1020 | else |
1dc74225 | 1021 | base_function = base_funs[4][weak_p]; |
b40da9a7 | 1022 | |
7def0f5c | 1023 | if (TREE_CODE (exp) == STRING_CST |
b40da9a7 | 1024 | && ((size_t) TREE_STRING_LENGTH (exp) |
a814bad5 | 1025 | == strlen (TREE_STRING_POINTER (exp)) + 1)) |
7def0f5c | 1026 | cstring_section (); |
1027 | else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST) | |
1028 | && flag_merge_constants) | |
52470889 | 1029 | { |
853b103d | 1030 | tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp)); |
52470889 | 1031 | |
1032 | if (TREE_CODE (size) == INTEGER_CST && | |
1033 | TREE_INT_CST_LOW (size) == 4 && | |
1034 | TREE_INT_CST_HIGH (size) == 0) | |
1035 | literal4_section (); | |
1036 | else if (TREE_CODE (size) == INTEGER_CST && | |
1037 | TREE_INT_CST_LOW (size) == 8 && | |
1038 | TREE_INT_CST_HIGH (size) == 0) | |
1039 | literal8_section (); | |
1040 | else | |
7def0f5c | 1041 | base_function (); |
52470889 | 1042 | } |
1043 | else if (TREE_CODE (exp) == CONSTRUCTOR | |
1044 | && TREE_TYPE (exp) | |
1045 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
1046 | && TYPE_NAME (TREE_TYPE (exp))) | |
1047 | { | |
1048 | tree name = TYPE_NAME (TREE_TYPE (exp)); | |
1049 | if (TREE_CODE (name) == TYPE_DECL) | |
1050 | name = DECL_NAME (name); | |
1051 | if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString")) | |
1052 | objc_constant_string_object_section (); | |
1053 | else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString")) | |
1054 | objc_string_object_section (); | |
52470889 | 1055 | else |
7def0f5c | 1056 | base_function (); |
52470889 | 1057 | } |
1058 | else if (TREE_CODE (exp) == VAR_DECL && | |
1059 | DECL_NAME (exp) && | |
1060 | TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE && | |
1061 | IDENTIFIER_POINTER (DECL_NAME (exp)) && | |
1062 | !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6)) | |
1063 | { | |
1064 | const char *name = IDENTIFIER_POINTER (DECL_NAME (exp)); | |
1065 | ||
1066 | if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20)) | |
1067 | objc_cls_meth_section (); | |
1068 | else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23)) | |
1069 | objc_inst_meth_section (); | |
1070 | else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20)) | |
1071 | objc_cat_cls_meth_section (); | |
1072 | else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23)) | |
1073 | objc_cat_inst_meth_section (); | |
1074 | else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22)) | |
1075 | objc_class_vars_section (); | |
1076 | else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25)) | |
1077 | objc_instance_vars_section (); | |
1078 | else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22)) | |
1079 | objc_cat_cls_meth_section (); | |
1080 | else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17)) | |
1081 | objc_class_names_section (); | |
1082 | else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20)) | |
1083 | objc_meth_var_names_section (); | |
1084 | else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20)) | |
1085 | objc_meth_var_types_section (); | |
1086 | else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22)) | |
1087 | objc_cls_refs_section (); | |
1088 | else if (!strncmp (name, "_OBJC_CLASS_", 12)) | |
1089 | objc_class_section (); | |
1090 | else if (!strncmp (name, "_OBJC_METACLASS_", 16)) | |
1091 | objc_meta_class_section (); | |
1092 | else if (!strncmp (name, "_OBJC_CATEGORY_", 15)) | |
1093 | objc_category_section (); | |
1094 | else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25)) | |
1095 | objc_selector_refs_section (); | |
1096 | else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20)) | |
1097 | objc_selector_fixup_section (); | |
1098 | else if (!strncmp (name, "_OBJC_SYMBOLS", 13)) | |
1099 | objc_symbols_section (); | |
1100 | else if (!strncmp (name, "_OBJC_MODULES", 13)) | |
1101 | objc_module_info_section (); | |
c17b85ea | 1102 | else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16)) |
1103 | objc_image_info_section (); | |
52470889 | 1104 | else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) |
1105 | objc_cat_inst_meth_section (); | |
1106 | else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) | |
1107 | objc_cat_cls_meth_section (); | |
1108 | else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20)) | |
1109 | objc_cat_cls_meth_section (); | |
1110 | else if (!strncmp (name, "_OBJC_PROTOCOL_", 15)) | |
1111 | objc_protocol_section (); | |
52470889 | 1112 | else |
7def0f5c | 1113 | base_function (); |
52470889 | 1114 | } |
1dc74225 | 1115 | /* ::operator new and ::operator delete must be coalesced, even |
1116 | if not weak. There are 8 variants that we look for. */ | |
1117 | else if (TREE_CODE (exp) == FUNCTION_DECL | |
1118 | && ! DECL_ONE_ONLY (exp)) | |
1119 | { | |
1120 | const char * name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (exp)); | |
1121 | if (name[0] == '_' && name[1] == 'Z' | |
1122 | && ((name[2] == 'n' && (name[3] == 'a' || name[3] == 'w') | |
1123 | && name[4] == 'm') | |
1124 | || (name[2] == 'd' && (name[3] == 'a' || name[3] == 'l') | |
1125 | && name[4] == 'P' && name[5] == 'v'))) | |
1126 | { | |
1127 | bool delete_p = name[2] == 'd'; | |
1128 | if (name[5 + delete_p] == 0 | |
1129 | || strcmp (name + 5 + delete_p, "KSt9nothrow_t") == 0) | |
1130 | base_funs[reloc][1] (); | |
1131 | else | |
1132 | base_function (); | |
1133 | } | |
1134 | else | |
1135 | base_function (); | |
1136 | } | |
52470889 | 1137 | else |
7def0f5c | 1138 | base_function (); |
52470889 | 1139 | } |
1140 | ||
bbfbe351 | 1141 | /* This can be called with address expressions as "rtx". |
9cb8e99f | 1142 | They must go in "const". */ |
bbfbe351 | 1143 | |
1144 | void | |
b40da9a7 | 1145 | machopic_select_rtx_section (enum machine_mode mode, rtx x, |
1146 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) | |
bbfbe351 | 1147 | { |
f2e8796e | 1148 | if (GET_MODE_SIZE (mode) == 8 |
1149 | && (GET_CODE (x) == CONST_INT | |
1150 | || GET_CODE (x) == CONST_DOUBLE)) | |
bbfbe351 | 1151 | literal8_section (); |
1152 | else if (GET_MODE_SIZE (mode) == 4 | |
1153 | && (GET_CODE (x) == CONST_INT | |
1154 | || GET_CODE (x) == CONST_DOUBLE)) | |
1155 | literal4_section (); | |
459f8624 | 1156 | else if (MACHOPIC_INDIRECT |
76dece62 | 1157 | && (GET_CODE (x) == SYMBOL_REF |
1158 | || GET_CODE (x) == CONST | |
1159 | || GET_CODE (x) == LABEL_REF)) | |
1160 | const_data_section (); | |
bbfbe351 | 1161 | else |
1162 | const_section (); | |
1163 | } | |
1164 | ||
01d15dc5 | 1165 | void |
b40da9a7 | 1166 | machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED) |
01d15dc5 | 1167 | { |
8f74ae7b | 1168 | if (MACHOPIC_INDIRECT) |
01d15dc5 | 1169 | mod_init_section (); |
1170 | else | |
1171 | constructor_section (); | |
09d688ff | 1172 | assemble_align (POINTER_SIZE); |
1173 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
01d15dc5 | 1174 | |
8f74ae7b | 1175 | if (! MACHOPIC_INDIRECT) |
01d15dc5 | 1176 | fprintf (asm_out_file, ".reference .constructors_used\n"); |
1177 | } | |
1178 | ||
1179 | void | |
b40da9a7 | 1180 | machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED) |
01d15dc5 | 1181 | { |
8f74ae7b | 1182 | if (MACHOPIC_INDIRECT) |
01d15dc5 | 1183 | mod_term_section (); |
1184 | else | |
1185 | destructor_section (); | |
09d688ff | 1186 | assemble_align (POINTER_SIZE); |
1187 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
01d15dc5 | 1188 | |
8f74ae7b | 1189 | if (! MACHOPIC_INDIRECT) |
01d15dc5 | 1190 | fprintf (asm_out_file, ".reference .destructors_used\n"); |
1191 | } | |
1f3233d1 | 1192 | |
67c1e638 | 1193 | void |
b40da9a7 | 1194 | darwin_globalize_label (FILE *stream, const char *name) |
67c1e638 | 1195 | { |
1196 | if (!!strncmp (name, "_OBJC_", 6)) | |
1197 | default_globalize_label (stream, name); | |
1198 | } | |
1199 | ||
2f9fc8ef | 1200 | void |
537cd941 | 1201 | darwin_asm_named_section (const char *name, |
1202 | unsigned int flags ATTRIBUTE_UNUSED, | |
1203 | tree decl ATTRIBUTE_UNUSED) | |
2f9fc8ef | 1204 | { |
1dc74225 | 1205 | fprintf (asm_out_file, "\t.section %s\n", name); |
2f9fc8ef | 1206 | } |
1207 | ||
2f9fc8ef | 1208 | void |
1dc74225 | 1209 | darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED) |
2f9fc8ef | 1210 | { |
1dc74225 | 1211 | /* Darwin does not use unique sections. */ |
2f9fc8ef | 1212 | } |
1213 | ||
975d636c | 1214 | /* Handle a "weak_import" attribute; arguments as in |
1215 | struct attribute_spec.handler. */ | |
1216 | ||
1217 | tree | |
1218 | darwin_handle_weak_import_attribute (tree *node, tree name, | |
1219 | tree ARG_UNUSED (args), | |
1220 | int ARG_UNUSED (flags), | |
1221 | bool * no_add_attrs) | |
1222 | { | |
d0ddd548 | 1223 | if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL) |
975d636c | 1224 | { |
9b2d6d13 | 1225 | warning (OPT_Wattributes, "%qs attribute ignored", |
1226 | IDENTIFIER_POINTER (name)); | |
975d636c | 1227 | *no_add_attrs = true; |
1228 | } | |
1229 | else | |
1230 | declare_weak (*node); | |
1231 | ||
1232 | return NULL_TREE; | |
1233 | } | |
a3952a36 | 1234 | |
1235 | static void | |
1236 | no_dead_strip (FILE *file, const char *lab) | |
1237 | { | |
975d636c | 1238 | fprintf (file, ".no_dead_strip %s\n", lab); |
a3952a36 | 1239 | } |
1240 | ||
2f9fc8ef | 1241 | /* Emit a label for an FDE, making it global and/or weak if appropriate. |
ef1074f7 | 1242 | The third parameter is nonzero if this is for exception handling. |
1243 | The fourth parameter is nonzero if this is just a placeholder for an | |
2f9fc8ef | 1244 | FDE that we are omitting. */ |
ef1074f7 | 1245 | |
2f9fc8ef | 1246 | void |
ef1074f7 | 1247 | darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty) |
2f9fc8ef | 1248 | { |
1249 | tree id = DECL_ASSEMBLER_NAME (decl) | |
1250 | ? DECL_ASSEMBLER_NAME (decl) | |
1251 | : DECL_NAME (decl); | |
1252 | ||
524eafbc | 1253 | const char *prefix = user_label_prefix; |
2f9fc8ef | 1254 | |
1255 | const char *base = IDENTIFIER_POINTER (id); | |
1256 | unsigned int base_len = IDENTIFIER_LENGTH (id); | |
1257 | ||
1258 | const char *suffix = ".eh"; | |
2f9fc8ef | 1259 | |
1260 | int need_quotes = name_needs_quotes (base); | |
1261 | int quotes_len = need_quotes ? 2 : 0; | |
ef1074f7 | 1262 | char *lab; |
1263 | ||
1264 | if (! for_eh) | |
1265 | suffix = ".eh1"; | |
2f9fc8ef | 1266 | |
524eafbc | 1267 | lab = xmalloc (strlen (prefix) |
1268 | + base_len + strlen (suffix) + quotes_len + 1); | |
2f9fc8ef | 1269 | lab[0] = '\0'; |
1270 | ||
1271 | if (need_quotes) | |
1272 | strcat(lab, "\""); | |
1273 | strcat(lab, prefix); | |
1274 | strcat(lab, base); | |
1275 | strcat(lab, suffix); | |
1276 | if (need_quotes) | |
1277 | strcat(lab, "\""); | |
1278 | ||
1279 | if (TREE_PUBLIC (decl)) | |
1dc74225 | 1280 | fprintf (file, "\t%s %s\n", |
2f9fc8ef | 1281 | (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN |
1282 | ? ".globl" | |
1283 | : ".private_extern"), | |
1284 | lab); | |
1285 | ||
1dc74225 | 1286 | if (DECL_WEAK (decl)) |
1287 | fprintf (file, "\t.weak_definition %s\n", lab); | |
2f9fc8ef | 1288 | |
1289 | if (empty) | |
a3952a36 | 1290 | { |
1291 | fprintf (file, "%s = 0\n", lab); | |
1292 | ||
1293 | /* Mark the absolute .eh and .eh1 style labels as needed to | |
1294 | ensure that we don't dead code strip them and keep such | |
1295 | labels from another instantiation point until we can fix this | |
1296 | properly with group comdat support. */ | |
1297 | no_dead_strip (file, lab); | |
1298 | } | |
2f9fc8ef | 1299 | else |
1300 | fprintf (file, "%s:\n", lab); | |
1301 | ||
1302 | free (lab); | |
1303 | } | |
1304 | ||
1305 | /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */ | |
ef1074f7 | 1306 | |
2f9fc8ef | 1307 | void |
1308 | darwin_non_lazy_pcrel (FILE *file, rtx addr) | |
1309 | { | |
2f9fc8ef | 1310 | const char *nlp_name; |
1311 | ||
27d2baef | 1312 | gcc_assert (GET_CODE (addr) == SYMBOL_REF); |
2f9fc8ef | 1313 | |
ab06d2ff | 1314 | nlp_name = machopic_indirection_name (addr, /*stub_p=*/false); |
2f9fc8ef | 1315 | fputs ("\t.long\t", file); |
1316 | ASM_OUTPUT_LABELREF (file, nlp_name); | |
1317 | fputs ("-.", file); | |
1318 | } | |
1319 | ||
2c5b6111 | 1320 | /* Emit an assembler directive to set visibility for a symbol. The |
1321 | only supported visibilities are VISIBILITY_DEFAULT and | |
1322 | VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private | |
1323 | extern". There is no MACH-O equivalent of ELF's | |
1324 | VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */ | |
1325 | ||
1326 | void | |
1327 | darwin_assemble_visibility (tree decl, int vis) | |
1328 | { | |
1329 | if (vis == VISIBILITY_DEFAULT) | |
1330 | ; | |
1331 | else if (vis == VISIBILITY_HIDDEN) | |
1332 | { | |
1333 | fputs ("\t.private_extern ", asm_out_file); | |
1334 | assemble_name (asm_out_file, | |
1335 | (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)))); | |
1336 | fputs ("\n", asm_out_file); | |
1337 | } | |
1338 | else | |
9b2d6d13 | 1339 | warning (OPT_Wattributes, "internal and protected visibility attributes " |
1340 | "not supported in this configuration; ignored"); | |
2c5b6111 | 1341 | } |
1342 | ||
a08b74c8 | 1343 | /* Output a difference of two labels that will be an assembly time |
1344 | constant if the two labels are local. (.long lab1-lab2 will be | |
1345 | very different if lab1 is at the boundary between two sections; it | |
1346 | will be relocated according to the second section, not the first, | |
1347 | so one ends up with a difference between labels in different | |
1348 | sections, which is bad in the dwarf2 eh context for instance.) */ | |
1349 | ||
1350 | static int darwin_dwarf_label_counter; | |
1351 | ||
1352 | void | |
85d3e3b5 | 1353 | darwin_asm_output_dwarf_delta (FILE *file, int size, |
b40da9a7 | 1354 | const char *lab1, const char *lab2) |
a08b74c8 | 1355 | { |
2f9fc8ef | 1356 | int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L' |
1357 | && lab2[0] == '*' && lab2[1] == 'L'); | |
dcf3c3f7 | 1358 | const char *directive = (size == 8 ? ".quad" : ".long"); |
a08b74c8 | 1359 | |
1360 | if (islocaldiff) | |
1361 | fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter); | |
1362 | else | |
85d3e3b5 | 1363 | fprintf (file, "\t%s\t", directive); |
48126f0c | 1364 | assemble_name_raw (file, lab1); |
a08b74c8 | 1365 | fprintf (file, "-"); |
48126f0c | 1366 | assemble_name_raw (file, lab2); |
a08b74c8 | 1367 | if (islocaldiff) |
85d3e3b5 | 1368 | fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++); |
a08b74c8 | 1369 | } |
1370 | ||
f6940372 | 1371 | void |
b40da9a7 | 1372 | darwin_file_end (void) |
f6940372 | 1373 | { |
1374 | machopic_finish (asm_out_file); | |
1375 | if (strcmp (lang_hooks.name, "GNU C++") == 0) | |
1376 | { | |
1377 | constructor_section (); | |
1378 | destructor_section (); | |
1379 | ASM_OUTPUT_ALIGN (asm_out_file, 1); | |
1380 | } | |
9e96724e | 1381 | fprintf (asm_out_file, "\t.subsections_via_symbols\n"); |
f6940372 | 1382 | } |
1383 | ||
1f3233d1 | 1384 | #include "gt-darwin.h" |