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80d725d7 | 1 | /* Functions for generic Darwin as target machine for GNU C compiler. |
093936a9 | 2 | Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004 |
80d725d7 | 3 | Free Software Foundation, Inc. |
4 | Contributed by Apple Computer Inc. | |
5 | ||
187b36cf | 6 | This file is part of GCC. |
80d725d7 | 7 | |
187b36cf | 8 | GCC is free software; you can redistribute it and/or modify |
80d725d7 | 9 | it under the terms of the GNU General Public License as published by |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
187b36cf | 13 | GCC is distributed in the hope that it will be useful, |
80d725d7 | 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
187b36cf | 19 | along with GCC; see the file COPYING. If not, write to |
80d725d7 | 20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "config.h" | |
24 | #include "system.h" | |
805e22b2 | 25 | #include "coretypes.h" |
26 | #include "tm.h" | |
80d725d7 | 27 | #include "rtl.h" |
28 | #include "regs.h" | |
29 | #include "hard-reg-set.h" | |
30 | #include "real.h" | |
31 | #include "insn-config.h" | |
32 | #include "conditions.h" | |
33 | #include "insn-flags.h" | |
34 | #include "output.h" | |
35 | #include "insn-attr.h" | |
36 | #include "flags.h" | |
37 | #include "tree.h" | |
38 | #include "expr.h" | |
39 | #include "reload.h" | |
80d725d7 | 40 | #include "function.h" |
41 | #include "ggc.h" | |
d19bd1f0 | 42 | #include "langhooks.h" |
6d3abfc0 | 43 | #include "target.h" |
79e2a0ca | 44 | #include "tm_p.h" |
2c5b6111 | 45 | #include "errors.h" |
ab06d2ff | 46 | #include "hashtab.h" |
80d725d7 | 47 | |
f0ed0e8a | 48 | /* Darwin supports a feature called fix-and-continue, which is used |
49 | for rapid turn around debugging. When code is compiled with the | |
50 | -mfix-and-continue flag, two changes are made to the generated code | |
51 | that allow the system to do things that it would normally not be | |
52 | able to do easily. These changes allow gdb to load in | |
53 | recompilation of a translation unit that has been changed into a | |
54 | running program and replace existing functions and methods of that | |
55 | translation unit with with versions of those functions and methods | |
56 | from the newly compiled translation unit. The new functions access | |
57 | the existing static data from the old translation unit, if the data | |
58 | existed in the unit to be replaced, and from the new translation | |
59 | unit, for new data. | |
60 | ||
61 | The changes are to insert 4 nops at the beginning of all functions | |
62 | and to use indirection to get at static duration data. The 4 nops | |
63 | are required by consumers of the generated code. Currently, gdb | |
64 | uses this to patch in a jump to the overriding function, this | |
65 | allows all uses of the old name to forward to the replacement, | |
84cbcde5 | 66 | including existing function pointers and virtual methods. See |
f0ed0e8a | 67 | rs6000_emit_prologue for the code that handles the nop insertions. |
68 | ||
69 | The added indirection allows gdb to redirect accesses to static | |
70 | duration data from the newly loaded translation unit to the | |
71 | existing data, if any. @code{static} data is special and is | |
72 | handled by setting the second word in the .non_lazy_symbol_pointer | |
73 | data structure to the address of the data. See indirect_data for | |
74 | the code that handles the extra indirection, and | |
75 | machopic_output_indirection and its use of MACHO_SYMBOL_STATIC for | |
76 | the code that handles @code{static} data indirection. */ | |
77 | ||
78 | ||
31c2995d | 79 | /* Nonzero if the user passes the -mone-byte-bool switch, which forces |
80 | sizeof(bool) to be 1. */ | |
81 | const char *darwin_one_byte_bool = 0; | |
82 | ||
80d725d7 | 83 | int |
b40da9a7 | 84 | name_needs_quotes (const char *name) |
80d725d7 | 85 | { |
86 | int c; | |
87 | while ((c = *name++) != '\0') | |
37ec5024 | 88 | if (! ISIDNUM (c) && c != '.' && c != '$') |
80d725d7 | 89 | return 1; |
90 | return 0; | |
91 | } | |
92 | ||
b40da9a7 | 93 | /* |
80d725d7 | 94 | * flag_pic = 1 ... generate only indirections |
95 | * flag_pic = 2 ... generate indirections and pure code | |
96 | */ | |
97 | ||
ab06d2ff | 98 | static int |
99 | machopic_symbol_defined_p (rtx sym_ref) | |
80d725d7 | 100 | { |
8d806159 | 101 | return (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED) |
102 | || (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref)); | |
80d725d7 | 103 | } |
104 | ||
ab06d2ff | 105 | /* This module assumes that (const (symbol_ref "foo")) is a legal pic |
106 | reference, which will not be changed. */ | |
b40da9a7 | 107 | |
80d725d7 | 108 | enum machopic_addr_class |
ab06d2ff | 109 | machopic_classify_symbol (rtx sym_ref) |
80d725d7 | 110 | { |
ab06d2ff | 111 | int flags; |
112 | bool function_p; | |
113 | ||
114 | flags = SYMBOL_REF_FLAGS (sym_ref); | |
115 | function_p = SYMBOL_REF_FUNCTION_P (sym_ref); | |
116 | if (machopic_symbol_defined_p (sym_ref)) | |
117 | return (function_p | |
118 | ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA); | |
119 | else | |
120 | return (function_p | |
121 | ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA); | |
80d725d7 | 122 | } |
123 | ||
f0ed0e8a | 124 | #ifndef TARGET_FIX_AND_CONTINUE |
125 | #define TARGET_FIX_AND_CONTINUE 0 | |
126 | #endif | |
127 | ||
128 | /* Indicate when fix-and-continue style code generation is being used | |
129 | and when a reference to data should be indirected so that it can be | |
130 | rebound in a new translation unit to refernce the original instance | |
131 | of that data. Symbol names that are for code generation local to | |
132 | the translation unit are bound to the new translation unit; | |
133 | currently this means symbols that begin with L or _OBJC_; | |
134 | otherwise, we indicate that an indirect reference should be made to | |
135 | permit the runtime to rebind new instances of the translation unit | |
136 | to the original instance of the data. */ | |
137 | ||
138 | static int | |
139 | indirect_data (rtx sym_ref) | |
140 | { | |
141 | int lprefix; | |
142 | const char *name; | |
143 | ||
144 | /* If we aren't generating fix-and-continue code, don't do anything special. */ | |
145 | if (TARGET_FIX_AND_CONTINUE == 0) | |
146 | return 0; | |
147 | ||
148 | /* Otherwise, all symbol except symbols that begin with L or _OBJC_ | |
149 | are indirected. Symbols that begin with L and _OBJC_ are always | |
150 | bound to the current translation unit as they are used for | |
151 | generated local data of the translation unit. */ | |
152 | ||
153 | name = XSTR (sym_ref, 0); | |
154 | ||
155 | lprefix = (((name[0] == '*' || name[0] == '&') | |
156 | && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L'))) | |
157 | || (strncmp (name, "_OBJC_", 6))); | |
158 | ||
159 | return ! lprefix; | |
160 | } | |
161 | ||
162 | ||
80d725d7 | 163 | static int |
ab06d2ff | 164 | machopic_data_defined_p (rtx sym_ref) |
80d725d7 | 165 | { |
f0ed0e8a | 166 | if (indirect_data (sym_ref)) |
167 | return 0; | |
168 | ||
ab06d2ff | 169 | switch (machopic_classify_symbol (sym_ref)) |
80d725d7 | 170 | { |
171 | case MACHOPIC_DEFINED_DATA: | |
172 | return 1; | |
173 | default: | |
174 | return 0; | |
175 | } | |
176 | } | |
177 | ||
80d725d7 | 178 | void |
ab06d2ff | 179 | machopic_define_symbol (rtx mem) |
80d725d7 | 180 | { |
ab06d2ff | 181 | rtx sym_ref; |
182 | if (GET_CODE (mem) != MEM) | |
183 | abort (); | |
184 | sym_ref = XEXP (mem, 0); | |
185 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; | |
80d725d7 | 186 | } |
187 | ||
3a32429b | 188 | static GTY(()) char * function_base; |
80d725d7 | 189 | |
a7260dec | 190 | const char * |
b40da9a7 | 191 | machopic_function_base_name (void) |
80d725d7 | 192 | { |
8f74ae7b | 193 | /* if dynamic-no-pic is on, we should not get here */ |
194 | if (MACHO_DYNAMIC_NO_PIC_P) | |
195 | abort (); | |
80d725d7 | 196 | |
b186bdc9 | 197 | if (function_base == NULL) |
b40da9a7 | 198 | function_base = |
b186bdc9 | 199 | (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>")); |
200 | ||
201 | current_function_uses_pic_offset_table = 1; | |
202 | ||
203 | return function_base; | |
204 | } | |
205 | ||
ab06d2ff | 206 | /* Return a SYMBOL_REF for the PIC function base. */ |
207 | ||
208 | rtx | |
209 | machopic_function_base_sym (void) | |
210 | { | |
211 | rtx sym_ref; | |
212 | ||
213 | sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ()); | |
214 | SYMBOL_REF_FLAGS (sym_ref) | |
215 | |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED); | |
216 | return sym_ref; | |
217 | } | |
218 | ||
b186bdc9 | 219 | static GTY(()) const char * function_base_func_name; |
220 | static GTY(()) int current_pic_label_num; | |
221 | ||
222 | void | |
223 | machopic_output_function_base_name (FILE *file) | |
224 | { | |
225 | const char *current_name; | |
226 | ||
1d60d981 | 227 | /* If dynamic-no-pic is on, we should not get here. */ |
b186bdc9 | 228 | if (MACHO_DYNAMIC_NO_PIC_P) |
229 | abort (); | |
b40da9a7 | 230 | current_name = |
b186bdc9 | 231 | IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); |
3a32429b | 232 | if (function_base_func_name != current_name) |
80d725d7 | 233 | { |
80d725d7 | 234 | ++current_pic_label_num; |
3a32429b | 235 | function_base_func_name = current_name; |
80d725d7 | 236 | } |
b186bdc9 | 237 | fprintf (file, "\"L%011d$pb\"", current_pic_label_num); |
80d725d7 | 238 | } |
239 | ||
ab06d2ff | 240 | /* The suffix attached to non-lazy pointer symbols. */ |
241 | #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr" | |
242 | /* The suffix attached to stub symbols. */ | |
243 | #define STUB_SUFFIX "$stub" | |
80d725d7 | 244 | |
ab06d2ff | 245 | typedef struct machopic_indirection GTY (()) |
80d725d7 | 246 | { |
ab06d2ff | 247 | /* The SYMBOL_REF for the entity referenced. */ |
248 | rtx symbol; | |
6d3abfc0 | 249 | /* The name of the stub or non-lazy pointer. */ |
250 | const char * ptr_name; | |
ab06d2ff | 251 | /* True iff this entry is for a stub (as opposed to a non-lazy |
252 | pointer). */ | |
253 | bool stub_p; | |
254 | /* True iff this stub or pointer pointer has been referenced. */ | |
255 | bool used; | |
256 | } machopic_indirection; | |
257 | ||
258 | /* A table mapping stub names and non-lazy pointer names to | |
259 | SYMBOL_REFs for the stubbed-to and pointed-to entities. */ | |
260 | ||
261 | static GTY ((param_is (struct machopic_indirection))) htab_t | |
262 | machopic_indirections; | |
263 | ||
264 | /* Return a hash value for a SLOT in the indirections hash table. */ | |
265 | ||
266 | static hashval_t | |
267 | machopic_indirection_hash (const void *slot) | |
268 | { | |
269 | const machopic_indirection *p = (const machopic_indirection *) slot; | |
6d3abfc0 | 270 | return htab_hash_string (p->ptr_name); |
ab06d2ff | 271 | } |
b40da9a7 | 272 | |
ab06d2ff | 273 | /* Returns true if the KEY is the same as that associated with |
274 | SLOT. */ | |
275 | ||
276 | static int | |
277 | machopic_indirection_eq (const void *slot, const void *key) | |
278 | { | |
6d3abfc0 | 279 | return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0; |
ab06d2ff | 280 | } |
80d725d7 | 281 | |
ab06d2ff | 282 | /* Return the name of the non-lazy pointer (if STUB_P is false) or |
283 | stub (if STUB_B is true) corresponding to the given name. */ | |
8dfaa51b | 284 | |
ab06d2ff | 285 | const char * |
286 | machopic_indirection_name (rtx sym_ref, bool stub_p) | |
287 | { | |
288 | char *buffer; | |
289 | const char *name = XSTR (sym_ref, 0); | |
6d3abfc0 | 290 | size_t namelen = strlen (name); |
ab06d2ff | 291 | machopic_indirection *p; |
6d3abfc0 | 292 | void ** slot; |
ab06d2ff | 293 | |
294 | /* Construct the name of the non-lazy pointer or stub. */ | |
295 | if (stub_p) | |
8dfaa51b | 296 | { |
ab06d2ff | 297 | int needs_quotes = name_needs_quotes (name); |
298 | buffer = alloca (strlen ("&L") | |
299 | + namelen | |
300 | + strlen (STUB_SUFFIX) | |
301 | + 2 /* possible quotes */ | |
302 | + 1 /* '\0' */); | |
303 | ||
304 | if (needs_quotes) | |
8dfaa51b | 305 | { |
ab06d2ff | 306 | if (name[0] == '*') |
307 | sprintf (buffer, "&\"L%s" STUB_SUFFIX "\"", name + 1); | |
308 | else | |
309 | sprintf (buffer, "&\"L%s%s" STUB_SUFFIX "\"", user_label_prefix, | |
310 | name); | |
8dfaa51b | 311 | } |
ab06d2ff | 312 | else if (name[0] == '*') |
313 | sprintf (buffer, "&L%s" STUB_SUFFIX, name + 1); | |
314 | else | |
315 | sprintf (buffer, "&L%s%s" STUB_SUFFIX, user_label_prefix, name); | |
316 | } | |
317 | else | |
318 | { | |
319 | buffer = alloca (strlen ("&L") | |
320 | + strlen (user_label_prefix) | |
321 | + namelen | |
322 | + strlen (NON_LAZY_POINTER_SUFFIX) | |
323 | + 1 /* '\0' */); | |
324 | if (name[0] == '*') | |
325 | sprintf (buffer, "&L%s" NON_LAZY_POINTER_SUFFIX, name + 1); | |
326 | else | |
327 | sprintf (buffer, "&L%s%s" NON_LAZY_POINTER_SUFFIX, | |
328 | user_label_prefix, name); | |
8dfaa51b | 329 | } |
330 | ||
6d3abfc0 | 331 | if (!machopic_indirections) |
332 | machopic_indirections = htab_create_ggc (37, | |
333 | machopic_indirection_hash, | |
334 | machopic_indirection_eq, | |
335 | /*htab_del=*/NULL); | |
336 | ||
337 | slot = htab_find_slot_with_hash (machopic_indirections, buffer, | |
338 | htab_hash_string (buffer), INSERT); | |
339 | if (*slot) | |
340 | { | |
341 | p = (machopic_indirection *) *slot; | |
342 | } | |
343 | else | |
ab06d2ff | 344 | { |
ab06d2ff | 345 | p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection)); |
346 | p->symbol = sym_ref; | |
6d3abfc0 | 347 | p->ptr_name = xstrdup (buffer); |
ab06d2ff | 348 | p->stub_p = stub_p; |
6d3abfc0 | 349 | p->used = false; |
350 | *slot = p; | |
ab06d2ff | 351 | } |
352 | ||
6d3abfc0 | 353 | return p->ptr_name; |
80d725d7 | 354 | } |
355 | ||
ab06d2ff | 356 | /* Return the name of the stub for the mcount function. */ |
80d725d7 | 357 | |
ab06d2ff | 358 | const char* |
359 | machopic_mcount_stub_name (void) | |
80d725d7 | 360 | { |
620dd87a | 361 | rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount"); |
362 | return machopic_indirection_name (symbol, /*stub_p=*/true); | |
80d725d7 | 363 | } |
364 | ||
ab06d2ff | 365 | /* If NAME is the name of a stub or a non-lazy pointer , mark the stub |
366 | or non-lazy pointer as used -- and mark the object to which the | |
367 | pointer/stub refers as used as well, since the pointer/stub will | |
368 | emit a reference to it. */ | |
369 | ||
80d725d7 | 370 | void |
ab06d2ff | 371 | machopic_validate_stub_or_non_lazy_ptr (const char *name) |
80d725d7 | 372 | { |
ab06d2ff | 373 | machopic_indirection *p; |
374 | ||
375 | p = ((machopic_indirection *) | |
6d3abfc0 | 376 | (htab_find_with_hash (machopic_indirections, name, |
377 | htab_hash_string (name)))); | |
378 | if (p && ! p->used) | |
ab06d2ff | 379 | { |
6d3abfc0 | 380 | const char *real_name; |
381 | tree id; | |
382 | ||
383 | p->used = true; | |
384 | ||
09e39ca0 | 385 | /* Do what output_addr_const will do when we actually call it. */ |
386 | if (SYMBOL_REF_DECL (p->symbol)) | |
387 | mark_decl_referenced (SYMBOL_REF_DECL (p->symbol)); | |
388 | ||
389 | real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0)); | |
6d3abfc0 | 390 | |
391 | id = maybe_get_identifier (real_name); | |
392 | if (id) | |
393 | mark_referenced (id); | |
ab06d2ff | 394 | } |
80d725d7 | 395 | } |
396 | ||
397 | /* Transform ORIG, which may be any data source, to the corresponding | |
398 | source using indirections. */ | |
399 | ||
400 | rtx | |
b40da9a7 | 401 | machopic_indirect_data_reference (rtx orig, rtx reg) |
80d725d7 | 402 | { |
403 | rtx ptr_ref = orig; | |
b40da9a7 | 404 | |
80d725d7 | 405 | if (! MACHOPIC_INDIRECT) |
406 | return orig; | |
407 | ||
408 | if (GET_CODE (orig) == SYMBOL_REF) | |
409 | { | |
ab06d2ff | 410 | int defined = machopic_data_defined_p (orig); |
8f74ae7b | 411 | |
412 | if (defined && MACHO_DYNAMIC_NO_PIC_P) | |
413 | { | |
414 | #if defined (TARGET_TOC) | |
301a5e52 | 415 | emit_insn (gen_macho_high (reg, orig)); |
416 | emit_insn (gen_macho_low (reg, reg, orig)); | |
8f74ae7b | 417 | #else |
418 | /* some other cpu -- writeme! */ | |
419 | abort (); | |
420 | #endif | |
421 | return reg; | |
422 | } | |
423 | else if (defined) | |
80d725d7 | 424 | { |
5352873f | 425 | #if defined (TARGET_TOC) || defined (HAVE_lo_sum) |
ab06d2ff | 426 | rtx pic_base = machopic_function_base_sym (); |
37ec5024 | 427 | rtx offset = gen_rtx_CONST (Pmode, |
428 | gen_rtx_MINUS (Pmode, orig, pic_base)); | |
5352873f | 429 | #endif |
80d725d7 | 430 | |
431 | #if defined (TARGET_TOC) /* i.e., PowerPC */ | |
64668281 | 432 | rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode)); |
80d725d7 | 433 | |
434 | if (reg == NULL) | |
435 | abort (); | |
436 | ||
37ec5024 | 437 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, |
438 | gen_rtx_PLUS (Pmode, pic_offset_table_rtx, | |
439 | gen_rtx_HIGH (Pmode, offset)))); | |
440 | emit_insn (gen_rtx_SET (Pmode, reg, | |
441 | gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset))); | |
80d725d7 | 442 | |
443 | orig = reg; | |
444 | #else | |
445 | #if defined (HAVE_lo_sum) | |
446 | if (reg == 0) abort (); | |
447 | ||
37ec5024 | 448 | emit_insn (gen_rtx_SET (VOIDmode, reg, |
449 | gen_rtx_HIGH (Pmode, offset))); | |
450 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
451 | gen_rtx_LO_SUM (Pmode, reg, offset))); | |
452 | emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx)); | |
80d725d7 | 453 | |
37ec5024 | 454 | orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg); |
80d725d7 | 455 | #endif |
456 | #endif | |
457 | return orig; | |
458 | } | |
459 | ||
329f67ae | 460 | ptr_ref = (gen_rtx_SYMBOL_REF |
ab06d2ff | 461 | (Pmode, |
462 | machopic_indirection_name (orig, /*stub_p=*/false))); | |
80d725d7 | 463 | |
e265a6da | 464 | SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig); |
f9226418 | 465 | |
e265a6da | 466 | ptr_ref = gen_const_mem (Pmode, ptr_ref); |
329f67ae | 467 | machopic_define_symbol (ptr_ref); |
80d725d7 | 468 | |
469 | return ptr_ref; | |
470 | } | |
471 | else if (GET_CODE (orig) == CONST) | |
472 | { | |
473 | rtx base, result; | |
474 | ||
475 | /* legitimize both operands of the PLUS */ | |
476 | if (GET_CODE (XEXP (orig, 0)) == PLUS) | |
477 | { | |
478 | base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0), | |
479 | reg); | |
480 | orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1), | |
481 | (base == reg ? 0 : reg)); | |
482 | } | |
b40da9a7 | 483 | else |
80d725d7 | 484 | return orig; |
485 | ||
486 | if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT) | |
b244d4c7 | 487 | result = plus_constant (base, INTVAL (orig)); |
80d725d7 | 488 | else |
37ec5024 | 489 | result = gen_rtx_PLUS (Pmode, base, orig); |
80d725d7 | 490 | |
80d725d7 | 491 | if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM) |
492 | { | |
493 | if (reg) | |
494 | { | |
495 | emit_move_insn (reg, result); | |
496 | result = reg; | |
497 | } | |
498 | else | |
499 | { | |
500 | result = force_reg (GET_MODE (result), result); | |
501 | } | |
502 | } | |
503 | ||
504 | return result; | |
505 | ||
506 | } | |
507 | else if (GET_CODE (orig) == MEM) | |
508 | XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg); | |
509 | /* When the target is i386, this code prevents crashes due to the | |
510 | compiler's ignorance on how to move the PIC base register to | |
511 | other registers. (The reload phase sometimes introduces such | |
512 | insns.) */ | |
513 | else if (GET_CODE (orig) == PLUS | |
514 | && GET_CODE (XEXP (orig, 0)) == REG | |
515 | && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM | |
516 | #ifdef I386 | |
517 | /* Prevent the same register from being erroneously used | |
518 | as both the base and index registers. */ | |
519 | && GET_CODE (XEXP (orig, 1)) == CONST | |
520 | #endif | |
521 | && reg) | |
522 | { | |
523 | emit_move_insn (reg, XEXP (orig, 0)); | |
524 | XEXP (ptr_ref, 0) = reg; | |
525 | } | |
526 | return ptr_ref; | |
527 | } | |
528 | ||
80d725d7 | 529 | /* Transform TARGET (a MEM), which is a function call target, to the |
530 | corresponding symbol_stub if necessary. Return a new MEM. */ | |
531 | ||
532 | rtx | |
b40da9a7 | 533 | machopic_indirect_call_target (rtx target) |
80d725d7 | 534 | { |
535 | if (GET_CODE (target) != MEM) | |
536 | return target; | |
537 | ||
ab06d2ff | 538 | if (MACHOPIC_INDIRECT |
539 | && GET_CODE (XEXP (target, 0)) == SYMBOL_REF | |
540 | && !(SYMBOL_REF_FLAGS (XEXP (target, 0)) | |
541 | & MACHO_SYMBOL_FLAG_DEFINED)) | |
b40da9a7 | 542 | { |
ab06d2ff | 543 | rtx sym_ref = XEXP (target, 0); |
544 | const char *stub_name = machopic_indirection_name (sym_ref, | |
545 | /*stub_p=*/true); | |
546 | enum machine_mode mode = GET_MODE (sym_ref); | |
547 | tree decl = SYMBOL_REF_DECL (sym_ref); | |
548 | ||
549 | XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name); | |
550 | SYMBOL_REF_DECL (XEXP (target, 0)) = decl; | |
b04fab2a | 551 | MEM_READONLY_P (target) = 1; |
e265a6da | 552 | MEM_NOTRAP_P (target) = 1; |
80d725d7 | 553 | } |
554 | ||
555 | return target; | |
556 | } | |
557 | ||
558 | rtx | |
b40da9a7 | 559 | machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) |
80d725d7 | 560 | { |
561 | rtx pic_ref = orig; | |
562 | ||
8f74ae7b | 563 | if (! MACHOPIC_INDIRECT) |
80d725d7 | 564 | return orig; |
565 | ||
566 | /* First handle a simple SYMBOL_REF or LABEL_REF */ | |
567 | if (GET_CODE (orig) == LABEL_REF | |
568 | || (GET_CODE (orig) == SYMBOL_REF | |
569 | )) | |
570 | { | |
571 | /* addr(foo) = &func+(foo-func) */ | |
572 | rtx pic_base; | |
573 | ||
574 | orig = machopic_indirect_data_reference (orig, reg); | |
575 | ||
b40da9a7 | 576 | if (GET_CODE (orig) == PLUS |
80d725d7 | 577 | && GET_CODE (XEXP (orig, 0)) == REG) |
578 | { | |
579 | if (reg == 0) | |
580 | return force_reg (mode, orig); | |
581 | ||
582 | emit_move_insn (reg, orig); | |
583 | return reg; | |
b40da9a7 | 584 | } |
80d725d7 | 585 | |
8f74ae7b | 586 | /* if dynamic-no-pic then use 0 as the pic base */ |
587 | if (MACHO_DYNAMIC_NO_PIC_P) | |
588 | pic_base = CONST0_RTX (Pmode); | |
589 | else | |
ab06d2ff | 590 | pic_base = machopic_function_base_sym (); |
80d725d7 | 591 | |
592 | if (GET_CODE (orig) == MEM) | |
593 | { | |
594 | if (reg == 0) | |
595 | { | |
596 | if (reload_in_progress) | |
597 | abort (); | |
598 | else | |
599 | reg = gen_reg_rtx (Pmode); | |
600 | } | |
b40da9a7 | 601 | |
80d725d7 | 602 | #ifdef HAVE_lo_sum |
8f74ae7b | 603 | if (MACHO_DYNAMIC_NO_PIC_P |
604 | && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
605 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF)) | |
606 | { | |
607 | #if defined (TARGET_TOC) /* ppc */ | |
608 | rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode); | |
609 | rtx asym = XEXP (orig, 0); | |
610 | rtx mem; | |
611 | ||
301a5e52 | 612 | emit_insn (gen_macho_high (temp_reg, asym)); |
e265a6da | 613 | mem = gen_const_mem (GET_MODE (orig), |
614 | gen_rtx_LO_SUM (Pmode, temp_reg, asym)); | |
37ec5024 | 615 | emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); |
8f74ae7b | 616 | #else |
617 | /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */ | |
618 | abort (); | |
619 | #endif | |
620 | pic_ref = reg; | |
621 | } | |
622 | else | |
b40da9a7 | 623 | if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF |
80d725d7 | 624 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) |
625 | { | |
37ec5024 | 626 | rtx offset = gen_rtx_CONST (Pmode, |
627 | gen_rtx_MINUS (Pmode, | |
628 | XEXP (orig, 0), | |
629 | pic_base)); | |
80d725d7 | 630 | #if defined (TARGET_TOC) /* i.e., PowerPC */ |
631 | /* Generating a new reg may expose opportunities for | |
632 | common subexpression elimination. */ | |
09c6aad0 | 633 | rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode); |
37ec5024 | 634 | rtx mem; |
635 | rtx insn; | |
636 | rtx sum; | |
637 | ||
638 | sum = gen_rtx_HIGH (Pmode, offset); | |
639 | if (! MACHO_DYNAMIC_NO_PIC_P) | |
640 | sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum); | |
80d725d7 | 641 | |
37ec5024 | 642 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum)); |
643 | ||
e265a6da | 644 | mem = gen_const_mem (GET_MODE (orig), |
645 | gen_rtx_LO_SUM (Pmode, | |
646 | hi_sum_reg, offset)); | |
37ec5024 | 647 | insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); |
648 | REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref, | |
649 | REG_NOTES (insn)); | |
650 | ||
651 | pic_ref = reg; | |
80d725d7 | 652 | #else |
37ec5024 | 653 | emit_insn (gen_rtx_USE (VOIDmode, |
654 | gen_rtx_REG (Pmode, | |
655 | PIC_OFFSET_TABLE_REGNUM))); | |
656 | ||
657 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
658 | gen_rtx_HIGH (Pmode, | |
659 | gen_rtx_CONST (Pmode, | |
660 | offset)))); | |
661 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
662 | gen_rtx_LO_SUM (Pmode, reg, | |
663 | gen_rtx_CONST (Pmode, offset)))); | |
664 | pic_ref = gen_rtx_PLUS (Pmode, | |
665 | pic_offset_table_rtx, reg); | |
80d725d7 | 666 | #endif |
667 | } | |
668 | else | |
669 | #endif /* HAVE_lo_sum */ | |
670 | { | |
671 | rtx pic = pic_offset_table_rtx; | |
672 | if (GET_CODE (pic) != REG) | |
673 | { | |
674 | emit_move_insn (reg, pic); | |
675 | pic = reg; | |
676 | } | |
677 | #if 0 | |
37ec5024 | 678 | emit_insn (gen_rtx_USE (VOIDmode, |
679 | gen_rtx_REG (Pmode, | |
680 | PIC_OFFSET_TABLE_REGNUM))); | |
80d725d7 | 681 | #endif |
682 | ||
37ec5024 | 683 | pic_ref = gen_rtx_PLUS (Pmode, |
684 | pic, | |
685 | gen_rtx_CONST (Pmode, | |
686 | gen_rtx_MINUS (Pmode, | |
687 | XEXP (orig, 0), | |
688 | pic_base))); | |
80d725d7 | 689 | } |
b40da9a7 | 690 | |
80d725d7 | 691 | #if !defined (TARGET_TOC) |
80d725d7 | 692 | emit_move_insn (reg, pic_ref); |
e265a6da | 693 | pic_ref = gen_const_mem (GET_MODE (orig), reg); |
7ba97778 | 694 | #endif |
80d725d7 | 695 | } |
696 | else | |
697 | { | |
698 | ||
699 | #ifdef HAVE_lo_sum | |
b40da9a7 | 700 | if (GET_CODE (orig) == SYMBOL_REF |
80d725d7 | 701 | || GET_CODE (orig) == LABEL_REF) |
702 | { | |
37ec5024 | 703 | rtx offset = gen_rtx_CONST (Pmode, |
704 | gen_rtx_MINUS (Pmode, | |
705 | orig, pic_base)); | |
80d725d7 | 706 | #if defined (TARGET_TOC) /* i.e., PowerPC */ |
707 | rtx hi_sum_reg; | |
708 | ||
709 | if (reg == 0) | |
710 | { | |
711 | if (reload_in_progress) | |
712 | abort (); | |
713 | else | |
09c6aad0 | 714 | reg = gen_reg_rtx (Pmode); |
80d725d7 | 715 | } |
b40da9a7 | 716 | |
80d725d7 | 717 | hi_sum_reg = reg; |
718 | ||
37ec5024 | 719 | emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, |
720 | (MACHO_DYNAMIC_NO_PIC_P) | |
721 | ? gen_rtx_HIGH (Pmode, offset) | |
722 | : gen_rtx_PLUS (Pmode, | |
723 | pic_offset_table_rtx, | |
724 | gen_rtx_HIGH (Pmode, | |
725 | offset)))); | |
726 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
727 | gen_rtx_LO_SUM (Pmode, | |
728 | hi_sum_reg, offset))); | |
80d725d7 | 729 | pic_ref = reg; |
730 | #else | |
37ec5024 | 731 | emit_insn (gen_rtx_SET (VOIDmode, reg, |
732 | gen_rtx_HIGH (Pmode, offset))); | |
733 | emit_insn (gen_rtx_SET (VOIDmode, reg, | |
734 | gen_rtx_LO_SUM (Pmode, reg, offset))); | |
735 | pic_ref = gen_rtx_PLUS (Pmode, | |
736 | pic_offset_table_rtx, reg); | |
80d725d7 | 737 | #endif |
738 | } | |
739 | else | |
740 | #endif /* HAVE_lo_sum */ | |
741 | { | |
742 | if (GET_CODE (orig) == REG) | |
743 | { | |
744 | return orig; | |
745 | } | |
746 | else | |
747 | { | |
748 | rtx pic = pic_offset_table_rtx; | |
749 | if (GET_CODE (pic) != REG) | |
750 | { | |
751 | emit_move_insn (reg, pic); | |
752 | pic = reg; | |
753 | } | |
754 | #if 0 | |
37ec5024 | 755 | emit_insn (gen_rtx_USE (VOIDmode, |
756 | pic_offset_table_rtx)); | |
80d725d7 | 757 | #endif |
37ec5024 | 758 | pic_ref = gen_rtx_PLUS (Pmode, |
759 | pic, | |
760 | gen_rtx_CONST (Pmode, | |
761 | gen_rtx_MINUS (Pmode, | |
762 | orig, pic_base))); | |
80d725d7 | 763 | } |
764 | } | |
765 | } | |
766 | ||
80d725d7 | 767 | if (GET_CODE (pic_ref) != REG) |
768 | { | |
769 | if (reg != 0) | |
770 | { | |
771 | emit_move_insn (reg, pic_ref); | |
772 | return reg; | |
773 | } | |
774 | else | |
775 | { | |
776 | return force_reg (mode, pic_ref); | |
777 | } | |
778 | } | |
779 | else | |
780 | { | |
781 | return pic_ref; | |
782 | } | |
783 | } | |
784 | ||
785 | else if (GET_CODE (orig) == SYMBOL_REF) | |
786 | return orig; | |
787 | ||
788 | else if (GET_CODE (orig) == PLUS | |
789 | && (GET_CODE (XEXP (orig, 0)) == MEM | |
790 | || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF | |
791 | || GET_CODE (XEXP (orig, 0)) == LABEL_REF) | |
792 | && XEXP (orig, 0) != pic_offset_table_rtx | |
793 | && GET_CODE (XEXP (orig, 1)) != REG) | |
b40da9a7 | 794 | |
80d725d7 | 795 | { |
796 | rtx base; | |
797 | int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM); | |
798 | ||
799 | base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
800 | orig = machopic_legitimize_pic_address (XEXP (orig, 1), | |
801 | Pmode, (base == reg ? 0 : reg)); | |
802 | if (GET_CODE (orig) == CONST_INT) | |
803 | { | |
b244d4c7 | 804 | pic_ref = plus_constant (base, INTVAL (orig)); |
80d725d7 | 805 | is_complex = 1; |
806 | } | |
807 | else | |
37ec5024 | 808 | pic_ref = gen_rtx_PLUS (Pmode, base, orig); |
80d725d7 | 809 | |
80d725d7 | 810 | if (reg && is_complex) |
811 | { | |
812 | emit_move_insn (reg, pic_ref); | |
813 | pic_ref = reg; | |
814 | } | |
815 | /* Likewise, should we set special REG_NOTEs here? */ | |
816 | } | |
817 | ||
818 | else if (GET_CODE (orig) == CONST) | |
819 | { | |
820 | return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
821 | } | |
822 | ||
823 | else if (GET_CODE (orig) == MEM | |
824 | && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF) | |
825 | { | |
826 | rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg); | |
b04fab2a | 827 | addr = replace_equiv_address (orig, addr); |
80d725d7 | 828 | emit_move_insn (reg, addr); |
829 | pic_ref = reg; | |
830 | } | |
831 | ||
832 | return pic_ref; | |
833 | } | |
834 | ||
ab06d2ff | 835 | /* Output the stub or non-lazy pointer in *SLOT, if it has been used. |
836 | DATA is the FILE* for assembly output. Called from | |
837 | htab_traverse. */ | |
80d725d7 | 838 | |
ab06d2ff | 839 | static int |
840 | machopic_output_indirection (void **slot, void *data) | |
80d725d7 | 841 | { |
ab06d2ff | 842 | machopic_indirection *p = *((machopic_indirection **) slot); |
843 | FILE *asm_out_file = (FILE *) data; | |
844 | rtx symbol; | |
845 | const char *sym_name; | |
846 | const char *ptr_name; | |
847 | ||
848 | if (!p->used) | |
849 | return 1; | |
80d725d7 | 850 | |
ab06d2ff | 851 | symbol = p->symbol; |
852 | sym_name = XSTR (symbol, 0); | |
6d3abfc0 | 853 | ptr_name = p->ptr_name; |
ab06d2ff | 854 | |
855 | if (p->stub_p) | |
80d725d7 | 856 | { |
80d725d7 | 857 | char *sym; |
858 | char *stub; | |
80d725d7 | 859 | |
80d725d7 | 860 | sym = alloca (strlen (sym_name) + 2); |
861 | if (sym_name[0] == '*' || sym_name[0] == '&') | |
862 | strcpy (sym, sym_name + 1); | |
863 | else if (sym_name[0] == '-' || sym_name[0] == '+') | |
b40da9a7 | 864 | strcpy (sym, sym_name); |
80d725d7 | 865 | else |
e9764bbb | 866 | sprintf (sym, "%s%s", user_label_prefix, sym_name); |
80d725d7 | 867 | |
ab06d2ff | 868 | stub = alloca (strlen (ptr_name) + 2); |
869 | if (ptr_name[0] == '*' || ptr_name[0] == '&') | |
870 | strcpy (stub, ptr_name + 1); | |
80d725d7 | 871 | else |
ab06d2ff | 872 | sprintf (stub, "%s%s", user_label_prefix, ptr_name); |
80d725d7 | 873 | |
09e39ca0 | 874 | machopic_output_stub (asm_out_file, sym, stub); |
80d725d7 | 875 | } |
f0ed0e8a | 876 | else if (! indirect_data (symbol) |
8d806159 | 877 | && (machopic_symbol_defined_p (symbol) |
878 | || SYMBOL_REF_LOCAL_P (symbol))) | |
80d725d7 | 879 | { |
ab06d2ff | 880 | data_section (); |
881 | assemble_align (GET_MODE_ALIGNMENT (Pmode)); | |
882 | assemble_label (ptr_name); | |
883 | assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name), | |
884 | GET_MODE_SIZE (Pmode), | |
885 | GET_MODE_ALIGNMENT (Pmode), 1); | |
80d725d7 | 886 | } |
ab06d2ff | 887 | else |
888 | { | |
f0ed0e8a | 889 | rtx init = const0_rtx; |
890 | ||
ab06d2ff | 891 | machopic_nl_symbol_ptr_section (); |
892 | assemble_name (asm_out_file, ptr_name); | |
893 | fprintf (asm_out_file, ":\n"); | |
894 | ||
895 | fprintf (asm_out_file, "\t.indirect_symbol "); | |
896 | assemble_name (asm_out_file, sym_name); | |
897 | fprintf (asm_out_file, "\n"); | |
898 | ||
f0ed0e8a | 899 | /* Variables that are marked with MACHO_SYMBOL_STATIC need to |
900 | have their symbol name instead of 0 in the second entry of | |
901 | the non-lazy symbol pointer data structure when they are | |
902 | defined. This allows the runtime to rebind newer instances | |
903 | of the translation unit with the original instance of the | |
904 | data. */ | |
905 | ||
906 | if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC) | |
907 | && machopic_symbol_defined_p (symbol)) | |
908 | init = gen_rtx_SYMBOL_REF (Pmode, sym_name); | |
909 | ||
910 | assemble_integer (init, GET_MODE_SIZE (Pmode), | |
ab06d2ff | 911 | GET_MODE_ALIGNMENT (Pmode), 1); |
912 | } | |
913 | ||
914 | return 1; | |
915 | } | |
916 | ||
917 | void | |
918 | machopic_finish (FILE *asm_out_file) | |
919 | { | |
920 | if (machopic_indirections) | |
f0ed0e8a | 921 | htab_traverse_noresize (machopic_indirections, |
ab06d2ff | 922 | machopic_output_indirection, |
923 | asm_out_file); | |
80d725d7 | 924 | } |
925 | ||
b40da9a7 | 926 | int |
927 | machopic_operand_p (rtx op) | |
80d725d7 | 928 | { |
929 | if (MACHOPIC_JUST_INDIRECT) | |
930 | { | |
931 | while (GET_CODE (op) == CONST) | |
932 | op = XEXP (op, 0); | |
933 | ||
934 | if (GET_CODE (op) == SYMBOL_REF) | |
ab06d2ff | 935 | return machopic_symbol_defined_p (op); |
80d725d7 | 936 | else |
937 | return 0; | |
938 | } | |
939 | ||
940 | while (GET_CODE (op) == CONST) | |
941 | op = XEXP (op, 0); | |
942 | ||
943 | if (GET_CODE (op) == MINUS | |
944 | && GET_CODE (XEXP (op, 0)) == SYMBOL_REF | |
945 | && GET_CODE (XEXP (op, 1)) == SYMBOL_REF | |
ab06d2ff | 946 | && machopic_symbol_defined_p (XEXP (op, 0)) |
947 | && machopic_symbol_defined_p (XEXP (op, 1))) | |
80d725d7 | 948 | return 1; |
949 | ||
80d725d7 | 950 | return 0; |
951 | } | |
8dfaa51b | 952 | |
953 | /* This function records whether a given name corresponds to a defined | |
954 | or undefined function or variable, for machopic_classify_ident to | |
955 | use later. */ | |
956 | ||
957 | void | |
b40da9a7 | 958 | darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED) |
8dfaa51b | 959 | { |
5a121a91 | 960 | rtx sym_ref; |
8dfaa51b | 961 | |
9af9a32c | 962 | /* Do the standard encoding things first. */ |
963 | default_encode_section_info (decl, rtl, first); | |
964 | ||
ab06d2ff | 965 | if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL) |
966 | return; | |
9af9a32c | 967 | |
ab06d2ff | 968 | sym_ref = XEXP (rtl, 0); |
969 | if (TREE_CODE (decl) == VAR_DECL) | |
970 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE; | |
971 | ||
972 | if (!DECL_EXTERNAL (decl) | |
1dc74225 | 973 | && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl)) |
8dfaa51b | 974 | && ((TREE_STATIC (decl) |
975 | && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl))) | |
2f4fae92 | 976 | || (!DECL_COMMON (decl) && DECL_INITIAL (decl) |
fd419242 | 977 | && DECL_INITIAL (decl) != error_mark_node))) |
ab06d2ff | 978 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; |
f0ed0e8a | 979 | |
980 | if (TREE_CODE (decl) == VAR_DECL | |
981 | && indirect_data (sym_ref) | |
982 | && ! TREE_PUBLIC (decl)) | |
983 | SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC; | |
e479d0de | 984 | } |
01d15dc5 | 985 | |
9423c9b7 | 986 | void |
987 | darwin_mark_decl_preserved (const char *name) | |
988 | { | |
989 | fprintf (asm_out_file, ".no_dead_strip "); | |
990 | assemble_name (asm_out_file, name); | |
991 | fputc ('\n', asm_out_file); | |
992 | } | |
993 | ||
52470889 | 994 | void |
b40da9a7 | 995 | machopic_select_section (tree exp, int reloc, |
996 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) | |
52470889 | 997 | { |
7def0f5c | 998 | void (*base_function)(void); |
1dc74225 | 999 | bool weak_p = DECL_P (exp) && DECL_WEAK (exp); |
1000 | static void (* const base_funs[][2])(void) = { | |
1001 | { text_section, text_coal_section }, | |
1002 | { text_unlikely_section, text_unlikely_coal_section }, | |
1003 | { readonly_data_section, const_coal_section }, | |
1004 | { const_data_section, const_data_coal_section }, | |
1005 | { data_section, data_coal_section } | |
1006 | }; | |
1007 | ||
1008 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
1009 | base_function = base_funs[reloc][weak_p]; | |
1010 | else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT)) | |
1011 | base_function = base_funs[2][weak_p]; | |
7def0f5c | 1012 | else if (TREE_READONLY (exp) || TREE_CONSTANT (exp)) |
1dc74225 | 1013 | base_function = base_funs[3][weak_p]; |
7def0f5c | 1014 | else |
1dc74225 | 1015 | base_function = base_funs[4][weak_p]; |
b40da9a7 | 1016 | |
7def0f5c | 1017 | if (TREE_CODE (exp) == STRING_CST |
b40da9a7 | 1018 | && ((size_t) TREE_STRING_LENGTH (exp) |
a814bad5 | 1019 | == strlen (TREE_STRING_POINTER (exp)) + 1)) |
7def0f5c | 1020 | cstring_section (); |
1021 | else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST) | |
1022 | && flag_merge_constants) | |
52470889 | 1023 | { |
1024 | tree size = TYPE_SIZE (TREE_TYPE (exp)); | |
1025 | ||
1026 | if (TREE_CODE (size) == INTEGER_CST && | |
1027 | TREE_INT_CST_LOW (size) == 4 && | |
1028 | TREE_INT_CST_HIGH (size) == 0) | |
1029 | literal4_section (); | |
1030 | else if (TREE_CODE (size) == INTEGER_CST && | |
1031 | TREE_INT_CST_LOW (size) == 8 && | |
1032 | TREE_INT_CST_HIGH (size) == 0) | |
1033 | literal8_section (); | |
1034 | else | |
7def0f5c | 1035 | base_function (); |
52470889 | 1036 | } |
1037 | else if (TREE_CODE (exp) == CONSTRUCTOR | |
1038 | && TREE_TYPE (exp) | |
1039 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
1040 | && TYPE_NAME (TREE_TYPE (exp))) | |
1041 | { | |
1042 | tree name = TYPE_NAME (TREE_TYPE (exp)); | |
1043 | if (TREE_CODE (name) == TYPE_DECL) | |
1044 | name = DECL_NAME (name); | |
1045 | if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString")) | |
1046 | objc_constant_string_object_section (); | |
1047 | else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString")) | |
1048 | objc_string_object_section (); | |
52470889 | 1049 | else |
7def0f5c | 1050 | base_function (); |
52470889 | 1051 | } |
1052 | else if (TREE_CODE (exp) == VAR_DECL && | |
1053 | DECL_NAME (exp) && | |
1054 | TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE && | |
1055 | IDENTIFIER_POINTER (DECL_NAME (exp)) && | |
1056 | !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6)) | |
1057 | { | |
1058 | const char *name = IDENTIFIER_POINTER (DECL_NAME (exp)); | |
1059 | ||
1060 | if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20)) | |
1061 | objc_cls_meth_section (); | |
1062 | else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23)) | |
1063 | objc_inst_meth_section (); | |
1064 | else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20)) | |
1065 | objc_cat_cls_meth_section (); | |
1066 | else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23)) | |
1067 | objc_cat_inst_meth_section (); | |
1068 | else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22)) | |
1069 | objc_class_vars_section (); | |
1070 | else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25)) | |
1071 | objc_instance_vars_section (); | |
1072 | else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22)) | |
1073 | objc_cat_cls_meth_section (); | |
1074 | else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17)) | |
1075 | objc_class_names_section (); | |
1076 | else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20)) | |
1077 | objc_meth_var_names_section (); | |
1078 | else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20)) | |
1079 | objc_meth_var_types_section (); | |
1080 | else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22)) | |
1081 | objc_cls_refs_section (); | |
1082 | else if (!strncmp (name, "_OBJC_CLASS_", 12)) | |
1083 | objc_class_section (); | |
1084 | else if (!strncmp (name, "_OBJC_METACLASS_", 16)) | |
1085 | objc_meta_class_section (); | |
1086 | else if (!strncmp (name, "_OBJC_CATEGORY_", 15)) | |
1087 | objc_category_section (); | |
1088 | else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25)) | |
1089 | objc_selector_refs_section (); | |
1090 | else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20)) | |
1091 | objc_selector_fixup_section (); | |
1092 | else if (!strncmp (name, "_OBJC_SYMBOLS", 13)) | |
1093 | objc_symbols_section (); | |
1094 | else if (!strncmp (name, "_OBJC_MODULES", 13)) | |
1095 | objc_module_info_section (); | |
c17b85ea | 1096 | else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16)) |
1097 | objc_image_info_section (); | |
52470889 | 1098 | else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) |
1099 | objc_cat_inst_meth_section (); | |
1100 | else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) | |
1101 | objc_cat_cls_meth_section (); | |
1102 | else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20)) | |
1103 | objc_cat_cls_meth_section (); | |
1104 | else if (!strncmp (name, "_OBJC_PROTOCOL_", 15)) | |
1105 | objc_protocol_section (); | |
52470889 | 1106 | else |
7def0f5c | 1107 | base_function (); |
52470889 | 1108 | } |
1dc74225 | 1109 | /* ::operator new and ::operator delete must be coalesced, even |
1110 | if not weak. There are 8 variants that we look for. */ | |
1111 | else if (TREE_CODE (exp) == FUNCTION_DECL | |
1112 | && ! DECL_ONE_ONLY (exp)) | |
1113 | { | |
1114 | const char * name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (exp)); | |
1115 | if (name[0] == '_' && name[1] == 'Z' | |
1116 | && ((name[2] == 'n' && (name[3] == 'a' || name[3] == 'w') | |
1117 | && name[4] == 'm') | |
1118 | || (name[2] == 'd' && (name[3] == 'a' || name[3] == 'l') | |
1119 | && name[4] == 'P' && name[5] == 'v'))) | |
1120 | { | |
1121 | bool delete_p = name[2] == 'd'; | |
1122 | if (name[5 + delete_p] == 0 | |
1123 | || strcmp (name + 5 + delete_p, "KSt9nothrow_t") == 0) | |
1124 | base_funs[reloc][1] (); | |
1125 | else | |
1126 | base_function (); | |
1127 | } | |
1128 | else | |
1129 | base_function (); | |
1130 | } | |
52470889 | 1131 | else |
7def0f5c | 1132 | base_function (); |
52470889 | 1133 | } |
1134 | ||
bbfbe351 | 1135 | /* This can be called with address expressions as "rtx". |
9cb8e99f | 1136 | They must go in "const". */ |
bbfbe351 | 1137 | |
1138 | void | |
b40da9a7 | 1139 | machopic_select_rtx_section (enum machine_mode mode, rtx x, |
1140 | unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) | |
bbfbe351 | 1141 | { |
1142 | if (GET_MODE_SIZE (mode) == 8) | |
1143 | literal8_section (); | |
1144 | else if (GET_MODE_SIZE (mode) == 4 | |
1145 | && (GET_CODE (x) == CONST_INT | |
1146 | || GET_CODE (x) == CONST_DOUBLE)) | |
1147 | literal4_section (); | |
459f8624 | 1148 | else if (MACHOPIC_INDIRECT |
76dece62 | 1149 | && (GET_CODE (x) == SYMBOL_REF |
1150 | || GET_CODE (x) == CONST | |
1151 | || GET_CODE (x) == LABEL_REF)) | |
1152 | const_data_section (); | |
bbfbe351 | 1153 | else |
1154 | const_section (); | |
1155 | } | |
1156 | ||
01d15dc5 | 1157 | void |
b40da9a7 | 1158 | machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED) |
01d15dc5 | 1159 | { |
8f74ae7b | 1160 | if (MACHOPIC_INDIRECT) |
01d15dc5 | 1161 | mod_init_section (); |
1162 | else | |
1163 | constructor_section (); | |
09d688ff | 1164 | assemble_align (POINTER_SIZE); |
1165 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
01d15dc5 | 1166 | |
8f74ae7b | 1167 | if (! MACHOPIC_INDIRECT) |
01d15dc5 | 1168 | fprintf (asm_out_file, ".reference .constructors_used\n"); |
1169 | } | |
1170 | ||
1171 | void | |
b40da9a7 | 1172 | machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED) |
01d15dc5 | 1173 | { |
8f74ae7b | 1174 | if (MACHOPIC_INDIRECT) |
01d15dc5 | 1175 | mod_term_section (); |
1176 | else | |
1177 | destructor_section (); | |
09d688ff | 1178 | assemble_align (POINTER_SIZE); |
1179 | assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); | |
01d15dc5 | 1180 | |
8f74ae7b | 1181 | if (! MACHOPIC_INDIRECT) |
01d15dc5 | 1182 | fprintf (asm_out_file, ".reference .destructors_used\n"); |
1183 | } | |
1f3233d1 | 1184 | |
67c1e638 | 1185 | void |
b40da9a7 | 1186 | darwin_globalize_label (FILE *stream, const char *name) |
67c1e638 | 1187 | { |
1188 | if (!!strncmp (name, "_OBJC_", 6)) | |
1189 | default_globalize_label (stream, name); | |
1190 | } | |
1191 | ||
2f9fc8ef | 1192 | void |
537cd941 | 1193 | darwin_asm_named_section (const char *name, |
1194 | unsigned int flags ATTRIBUTE_UNUSED, | |
1195 | tree decl ATTRIBUTE_UNUSED) | |
2f9fc8ef | 1196 | { |
1dc74225 | 1197 | fprintf (asm_out_file, "\t.section %s\n", name); |
2f9fc8ef | 1198 | } |
1199 | ||
2f9fc8ef | 1200 | void |
1dc74225 | 1201 | darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED) |
2f9fc8ef | 1202 | { |
1dc74225 | 1203 | /* Darwin does not use unique sections. */ |
2f9fc8ef | 1204 | } |
1205 | ||
975d636c | 1206 | /* Handle a "weak_import" attribute; arguments as in |
1207 | struct attribute_spec.handler. */ | |
1208 | ||
1209 | tree | |
1210 | darwin_handle_weak_import_attribute (tree *node, tree name, | |
1211 | tree ARG_UNUSED (args), | |
1212 | int ARG_UNUSED (flags), | |
1213 | bool * no_add_attrs) | |
1214 | { | |
1215 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
1216 | { | |
1e5fcbe2 | 1217 | warning ("%qs attribute ignored", IDENTIFIER_POINTER (name)); |
975d636c | 1218 | *no_add_attrs = true; |
1219 | } | |
1220 | else | |
1221 | declare_weak (*node); | |
1222 | ||
1223 | return NULL_TREE; | |
1224 | } | |
a3952a36 | 1225 | |
1226 | static void | |
1227 | no_dead_strip (FILE *file, const char *lab) | |
1228 | { | |
975d636c | 1229 | fprintf (file, ".no_dead_strip %s\n", lab); |
a3952a36 | 1230 | } |
1231 | ||
2f9fc8ef | 1232 | /* Emit a label for an FDE, making it global and/or weak if appropriate. |
ef1074f7 | 1233 | The third parameter is nonzero if this is for exception handling. |
1234 | The fourth parameter is nonzero if this is just a placeholder for an | |
2f9fc8ef | 1235 | FDE that we are omitting. */ |
ef1074f7 | 1236 | |
2f9fc8ef | 1237 | void |
ef1074f7 | 1238 | darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty) |
2f9fc8ef | 1239 | { |
1240 | tree id = DECL_ASSEMBLER_NAME (decl) | |
1241 | ? DECL_ASSEMBLER_NAME (decl) | |
1242 | : DECL_NAME (decl); | |
1243 | ||
1244 | const char *prefix = "_"; | |
1245 | const int prefix_len = 1; | |
1246 | ||
1247 | const char *base = IDENTIFIER_POINTER (id); | |
1248 | unsigned int base_len = IDENTIFIER_LENGTH (id); | |
1249 | ||
1250 | const char *suffix = ".eh"; | |
2f9fc8ef | 1251 | |
1252 | int need_quotes = name_needs_quotes (base); | |
1253 | int quotes_len = need_quotes ? 2 : 0; | |
ef1074f7 | 1254 | char *lab; |
1255 | ||
1256 | if (! for_eh) | |
1257 | suffix = ".eh1"; | |
2f9fc8ef | 1258 | |
ef1074f7 | 1259 | lab = xmalloc (prefix_len + base_len + strlen (suffix) + quotes_len + 1); |
2f9fc8ef | 1260 | lab[0] = '\0'; |
1261 | ||
1262 | if (need_quotes) | |
1263 | strcat(lab, "\""); | |
1264 | strcat(lab, prefix); | |
1265 | strcat(lab, base); | |
1266 | strcat(lab, suffix); | |
1267 | if (need_quotes) | |
1268 | strcat(lab, "\""); | |
1269 | ||
1270 | if (TREE_PUBLIC (decl)) | |
1dc74225 | 1271 | fprintf (file, "\t%s %s\n", |
2f9fc8ef | 1272 | (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN |
1273 | ? ".globl" | |
1274 | : ".private_extern"), | |
1275 | lab); | |
1276 | ||
1dc74225 | 1277 | if (DECL_WEAK (decl)) |
1278 | fprintf (file, "\t.weak_definition %s\n", lab); | |
2f9fc8ef | 1279 | |
1280 | if (empty) | |
a3952a36 | 1281 | { |
1282 | fprintf (file, "%s = 0\n", lab); | |
1283 | ||
1284 | /* Mark the absolute .eh and .eh1 style labels as needed to | |
1285 | ensure that we don't dead code strip them and keep such | |
1286 | labels from another instantiation point until we can fix this | |
1287 | properly with group comdat support. */ | |
1288 | no_dead_strip (file, lab); | |
1289 | } | |
2f9fc8ef | 1290 | else |
1291 | fprintf (file, "%s:\n", lab); | |
1292 | ||
1293 | free (lab); | |
1294 | } | |
1295 | ||
1296 | /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */ | |
ef1074f7 | 1297 | |
2f9fc8ef | 1298 | void |
1299 | darwin_non_lazy_pcrel (FILE *file, rtx addr) | |
1300 | { | |
2f9fc8ef | 1301 | const char *nlp_name; |
1302 | ||
1303 | if (GET_CODE (addr) != SYMBOL_REF) | |
1304 | abort (); | |
1305 | ||
ab06d2ff | 1306 | nlp_name = machopic_indirection_name (addr, /*stub_p=*/false); |
2f9fc8ef | 1307 | fputs ("\t.long\t", file); |
1308 | ASM_OUTPUT_LABELREF (file, nlp_name); | |
1309 | fputs ("-.", file); | |
1310 | } | |
1311 | ||
2c5b6111 | 1312 | /* Emit an assembler directive to set visibility for a symbol. The |
1313 | only supported visibilities are VISIBILITY_DEFAULT and | |
1314 | VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private | |
1315 | extern". There is no MACH-O equivalent of ELF's | |
1316 | VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */ | |
1317 | ||
1318 | void | |
1319 | darwin_assemble_visibility (tree decl, int vis) | |
1320 | { | |
1321 | if (vis == VISIBILITY_DEFAULT) | |
1322 | ; | |
1323 | else if (vis == VISIBILITY_HIDDEN) | |
1324 | { | |
1325 | fputs ("\t.private_extern ", asm_out_file); | |
1326 | assemble_name (asm_out_file, | |
1327 | (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)))); | |
1328 | fputs ("\n", asm_out_file); | |
1329 | } | |
1330 | else | |
1331 | warning ("internal and protected visibility attributes not supported" | |
1332 | "in this configuration; ignored"); | |
1333 | } | |
1334 | ||
a08b74c8 | 1335 | /* Output a difference of two labels that will be an assembly time |
1336 | constant if the two labels are local. (.long lab1-lab2 will be | |
1337 | very different if lab1 is at the boundary between two sections; it | |
1338 | will be relocated according to the second section, not the first, | |
1339 | so one ends up with a difference between labels in different | |
1340 | sections, which is bad in the dwarf2 eh context for instance.) */ | |
1341 | ||
1342 | static int darwin_dwarf_label_counter; | |
1343 | ||
1344 | void | |
b40da9a7 | 1345 | darwin_asm_output_dwarf_delta (FILE *file, int size ATTRIBUTE_UNUSED, |
1346 | const char *lab1, const char *lab2) | |
a08b74c8 | 1347 | { |
2f9fc8ef | 1348 | int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L' |
1349 | && lab2[0] == '*' && lab2[1] == 'L'); | |
a08b74c8 | 1350 | |
1351 | if (islocaldiff) | |
1352 | fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter); | |
1353 | else | |
1354 | fprintf (file, "\t%s\t", ".long"); | |
1355 | assemble_name (file, lab1); | |
1356 | fprintf (file, "-"); | |
1357 | assemble_name (file, lab2); | |
1358 | if (islocaldiff) | |
1359 | fprintf (file, "\n\t.long L$set$%d", darwin_dwarf_label_counter++); | |
1360 | } | |
1361 | ||
f6940372 | 1362 | void |
b40da9a7 | 1363 | darwin_file_end (void) |
f6940372 | 1364 | { |
1365 | machopic_finish (asm_out_file); | |
1366 | if (strcmp (lang_hooks.name, "GNU C++") == 0) | |
1367 | { | |
1368 | constructor_section (); | |
1369 | destructor_section (); | |
1370 | ASM_OUTPUT_ALIGN (asm_out_file, 1); | |
1371 | } | |
9e96724e | 1372 | fprintf (asm_out_file, "\t.subsections_via_symbols\n"); |
f6940372 | 1373 | } |
1374 | ||
f0ed0e8a | 1375 | /* True, iff we're generating fast turn around debugging code. When |
1376 | true, we arrange for function prologues to start with 4 nops so | |
1377 | that gdb may insert code to redirect them, and for data to accessed | |
1378 | indirectly. The runtime uses this indirection to forward | |
1379 | references for data to the original instance of that data. */ | |
1380 | ||
1381 | int darwin_fix_and_continue; | |
1382 | const char *darwin_fix_and_continue_switch; | |
1383 | ||
1f3233d1 | 1384 | #include "gt-darwin.h" |